WO2016169015A1 - Method and apparatus for switching network communication and direct communication - Google Patents

Abstract

Embodiments of the present invention provide a method and apparatus for switching network communication and direct communication. A first UE instructs, by sending switching instruction information to a second UE, the second UE to switch a communication path therebetween from a network communication path to a direct communication path, acquires a first public network IP address and a first public network port number, and establishes the direct communication path using the first public network IP address and the first public network port number. In the method, after a communication path is switched, a data packet, sent by a first UE and received by a second UE, does not change, and in the view of the second UE, an IP address and port number of the first UE do not change, thereby guaranteeing that services of a user are not interrupted.

Description

Method and device for switching between network communication and direct communication Technical field

The embodiments of the present invention relate to communication technologies, and in particular, to a method and an apparatus for switching between network communication and direct communication.

Background technique

In a Long Term Evolution (LTE) network, a data communication path between user equipments (UEs) passes through an access network entity: an evolved base station (eNB), and a core. Network entity: Serving Gateway (S-GW) or Packet Data Network Gateway (P-GW). Therefore, even if the two UEs are very close, the data communication path needs to be passed when the data is transmitted. Data transmission is performed, and the network communication path includes the foregoing access network entity and core network entity. This will have a large demand for the transmission bandwidth of the LTE network, and the transmission efficiency is low.

In order to solve this problem, the industry proposes a Device to Device (D2D) communication method, that is, a relatively close UE can transmit data through a direct communication path without going through an access network entity and a core network. entity. However, in the prior art, when a user's session is switched from a network communication path to a direct communication path, the user's service is interrupted.

Summary of the invention

The embodiment of the invention provides a method and a device for switching between network communication and direct communication, which can ensure that the user's service is not interrupted when the user's session is switched between network communication and direct communication.

A first aspect of the present invention provides a method for switching between network communication and direct communication, including:

The first UE sends the handover indication information to the second UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path;

The first UE acquires a first public network IP address and a first public network port number, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path. Public network IP address, the first public network port number is the network communication path of the first UE a public network port number used for communicating with the second UE;

The first UE establishes the direct communication path by using the first public network IP address and the first public network port number;

The first UE communicates with the second UE on the direct communication path.

With reference to the first aspect, in a first possible implementation manner of the first aspect, the sending, by the first UE, the handover indication information to the second UE includes:

Sending, by the first UE, a first request message to the second UE, where the first request message is used to request to acquire the first public network IP address and the first public network port number, the first request The message includes the handover indication information;

Obtaining, by the first UE, the first public network IP address and the first public network port number, including:

The first UE receives the first response message returned by the second UE, where the first response message includes: the first public network IP address and the first public network port number.

With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the first request message further includes application identifier information, where the application identifier information is used to indicate the first The two UEs switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

In conjunction with the first or second possible implementation of the first aspect, in a third possible implementation manner of the first aspect, the first UE uses the first public network IP address and the first Before the public network port number establishes the direct communication path, the method further includes:

Receiving, by the first UE, a second request message sent by the second UE, where the second request message is used to request the first UE to acquire a second public network IP address and a second public network port, where the The second public network IP address is the public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE in the a public network port number used by the network communication path to communicate with the first UE;

The first UE sends a second response message to the second UE, where the second response message includes: the second public network IP address and port number and the second public network port number.

With reference to the first aspect, in a fourth possible implementation manner of the first aspect, the acquiring, by the first UE, the first public network IP address and the first public network port number includes:

The first UE sends a first direct communication request message to the second UE, where the first direct communication request message further includes: a second public network IP address and a second public network port number, The second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE a public network port number used by the network communication path to communicate with the first UE;

The first UE receives the first direct communication response message returned by the second UE, where the first direct communication response message includes: the first public network IP address and the first public network port number.

In conjunction with the fourth possible implementation of the first aspect, in a fifth possible implementation manner of the first aspect, the handover indication information is carried in the first direct communication request message.

With reference to the first aspect, in a sixth possible implementation manner of the first aspect, the sending, by the first UE, the handover indication information to the second UE includes:

The first UE sends a second direct communication request message to the second UE, where the second direct communication request message includes the handover indication information;

Obtaining, by the first UE, the first public network IP address and the first public network port number, including:

The first UE sends a third request message to the application server, where the third request message is used to request to acquire the first public network IP address and the first public network port number;

The first UE receives the third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number.

With reference to any one of the fourth to sixth possible implementation manners of the first aspect, in a seventh possible implementation manner of the first aspect, the first direct communication request message or the second direct communication The request message further includes application identification information, where the application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

With reference to the first aspect, in an eighth possible implementation manner of the first aspect, the first UE that communicates with the second UE on the direct communication path includes:

The first UE uses the first public network IP address as a source IP address of a data packet sent to the second UE, and uses the first public network port number as a source port number of the data packet, and The second public network IP address is used as the destination IP address of the data packet, and the second public network port number is used as the destination port number of the data packet, and the data packet is sent to the second through the direct communication path. a UE, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path.

A second aspect of the present invention provides a method for switching between network communication and direct communication, including:

The second UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path;

The second UE acquires a second public network IP address and a second public network port number, where the second public network IP address is used by the second UE to communicate with the first UE in the network communication path. a public network IP address, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path;

The second UE establishes the direct communication path by using the second public network IP address and the second public network port number;

The second UE communicates with the first UE on the direct communication path.

With reference to the second aspect, in a first possible implementation manner of the second aspect, the acquiring, by the second UE, the second public network IP address and the second public network port number includes:

The second UE sends a second request message to the first UE, where the second request message is used to request the first UE to acquire the second public network IP address and the second public network port number. ;

The second UE receives the second response message that is returned by the first UE, where the second response message includes: the second public network IP address and the second public network port number.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, before the second UE acquires the second public network IP address and the second public network port number, The method also includes:

Receiving, by the second UE, the first request message sent by the first UE, where the first request message includes the handover indication information, where the first request message is used to request to acquire a first public network IP address and a first a public network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number a public network port number used by the first UE to communicate with the second UE in the network communication path;

Determining, by the second UE, the first public network IP address and the first public network port number used by the first UE and the second UE in the network communication path according to the handover indication information ;

The second UE sends the first public network IP address and the first public network port number in the first response message to the first UE.

With reference to the second possible implementation of the second aspect, in a third possible implementation manner of the second aspect, the first request message further includes application identifier information, where the application identifier information is used to indicate the The second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

With reference to the second aspect, in a fourth possible implementation manner of the second aspect, the acquiring, by the second UE, the second public network IP address and the second public network port number includes:

The second UE receives the first direct communication request message sent by the first UE, where the first direct communication request message includes the second public network IP address and the second public network port number.

In conjunction with the fourth possible implementation of the second aspect, in a fifth possible implementation manner of the second aspect, the handover indication information is carried in the first direct communication request message.

In conjunction with the fourth or fifth possible implementation of the second aspect, in a sixth possible implementation manner of the second aspect, the second UE receives the first direct communication request message sent by the first UE Thereafter, the method further includes:

Returning, by the second UE, the first direct communication response message to the first UE, where the first direct communication response message includes: a first public network IP address and a first public network port number, the first public network The IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first UE in the network communication path. A public network port number used for communicating with the second UE.

With reference to the second aspect, in a seventh possible implementation manner of the second aspect, the receiving, by the second UE, the handover indication information that is sent by the first UE includes:

The second UE receives the second direct communication request message sent by the first UE, where the second direct communication request message includes the handover indication information;

Obtaining, by the second UE, the second public network IP address and the second public network port number, including:

The second UE sends a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number;

The second UE receives the fourth response message returned by the application server, where the fourth response message includes: the second public network IP address and the second public network port number.

With reference to any one of the fourth to seventh possible implementation manners of the second aspect, in the eighth possible implementation manner of the second aspect, the first direct communication request message or the second direct The communication request message further includes application identification information, where the application identification information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. .

With reference to the second aspect, in a ninth possible implementation manner of the second aspect, the second UE that communicates with the first UE on the direct communication path includes:

The second UE uses the second public network IP address as the source IP address of the data packet sent to the first UE, and the second public network port number as the source port number of the data packet, The first public network IP address is used as the destination IP address of the data packet, and the first public network port number is used as the destination port number of the data packet, and the data packet is sent to the first through the direct communication path. a UE, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path.

A third aspect of the present invention provides a method for switching between network communication and direct communication, including:

The first UE sends the handover indication information to the second UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path;

The first UE acquires a first public network IP address and a first public network port number, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path. a public network IP address, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path;

The first UE acquires a second private network IP address and a second private network port number, where the second private network IP address is used by the second UE to communicate with the first UE in the network communication path. a private network IP address, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path;

The first UE establishes the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number;

The first UE communicates with the second UE on the direct communication path.

With reference to the third aspect, in a first possible implementation manner of the third aspect, the first UE uses the first public network IP address, the first public network port number, and the second private network IP Establishing the direct communication path by the address and the second private network port number, including:

The first UE establishes a first correspondence between the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number, and the second public network IP address. And a second corresponding relationship between the second public network port number and the second private network IP address and the second private network port number, where the first private network IP address is the first UE in the a private network IP address used in communication with the second UE in the network communication path, where the first private network port number is used by the first UE to communicate with the second UE in the network communication path a private network port number, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path.

In conjunction with the first possible implementation of the third aspect, in a second possible implementation manner of the third aspect, the first UE that communicates with the second UE on the direct communication path includes:

The first UE replaces the source IP address of the data packet sent to the second UE with the first public network IP address according to the first correspondence, and replaces the source port number of the data packet with the The first public network port number, the destination IP address of the data packet is replaced with the second private network IP address according to the second correspondence, and the destination port number of the data packet is replaced by the second a private network port number, where the source port number of the data packet is the first private network port number, the source port number of the data packet is the first private network port number, and the destination IP address of the data packet The address is the second public network IP address, the destination port number of the data packet is the second public network port number, and the first UE sends the data packet to the first Two UE;

Or the first UE receives the data packet sent by the second UE by using the direct communication path.

In conjunction with the third aspect, in a third possible implementation of the third aspect, the first The UE sends the handover indication information to the second UE, including:

The first UE sends a third direct communication request message to the second UE, where the third direct communication request message includes: the handover indication information;

Obtaining, by the first UE, the first public network IP address and the first public network port number, including:

Receiving, by the first UE, the third direct communication response message that is returned by the second UE, where the third direct communication response message includes: the first public network IP address and the first public network port number;

The first UE acquires the second private network IP address and the second private network port number, including:

The third direct communication response message further includes: the second private network IP address and the second private network port number, where the first UE acquires the second from the third direct communication response message The private network IP address and the second private network port number.

With reference to the third aspect, in a fourth possible implementation manner of the third aspect, the sending, by the first UE, the handover indication information to the second UE includes:

The first UE sends a fourth direct communication request message to the second UE, where the fourth direct communication request message includes: the handover indication information;

Obtaining, by the first UE, the first public network IP address and the first public network port number, including:

The first UE sends a third request message to the application server, where the third request message is used to request to acquire the first public network IP address and the first public network port number;

The first UE receives the third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number;

The first UE acquires the second private network IP address and the second private network port number, including:

The first UE receives the fourth direct communication response message returned by the second UE, where the fourth direct communication response message includes: the second private network IP address and the second private network port number.

With the third possible implementation of the third aspect, in a fifth possible implementation manner of the third aspect, the third direct communication request message further includes: a first private network IP address and a first private network a port number, a second public network IP address, and a second public network port number, where the first private network IP address is a private network used by the first UE to communicate with the second UE in the network communication path. An IP address, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path, and the second public network IP address is the First a public network IP address used by the two UEs to communicate with the first UE in the network communication path, and the second public network port number is the first UE in the network communication path of the second UE The public network port number used for communication.

With the fourth possible implementation of the third aspect, in a sixth possible implementation manner of the third aspect, the fourth direct communication request message further includes: a first private network IP address and a first private network a port number, where the first private network IP address is a private network IP address used by the first UE to communicate with the second UE in the network communication path, where the first private network port number is A private network port number used by the first UE to communicate with the second UE in the network communication path.

With reference to the fifth or the sixth possible implementation manner of the third aspect, in a seventh possible implementation manner of the third aspect, the third direct communication request message or the fourth direct communication request message is further The application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

A fourth aspect of the present invention provides a method for switching between network communication and direct communication, including:

The second UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path;

The second UE acquires a second public network IP address and a second public network port number, where the second public network IP address is used by the second UE to communicate with the first UE in the network communication path. a public network IP address, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path;

The second UE acquires a first private network IP address and a first private network port number, where the first private network IP address is used by the first UE to communicate with the second UE in the network communication path. a private network IP address, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path;

The second UE establishes the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port;

The second UE communicates with the first UE on the direct communication path.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the second UE uses the second public network IP address, the second public network port number, and the first private network IP Establishing the direct communication path with the address and the first private network port, including:

The second UE establishes a first correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number, and the first public network IP address. a second corresponding relationship between the first public network port number and the first private network IP address and the first private network port number, where the second private network IP address is the second UE in the a private network IP address used in communication with the first UE in a network communication path, where the second private network port number is used by the second UE to communicate with the first UE in the network communication path a private network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path.

With the first possible implementation of the fourth aspect, in a second possible implementation manner of the fourth aspect, the second UE that communicates with the first UE on the direct communication path includes:

The second UE replaces the source IP address of the data packet sent to the first UE with the second public network IP address according to the first correspondence, and replaces the source port number of the data packet with the a second public network port number, the destination IP address of the data packet is replaced with the first private network IP address according to the second correspondence, and the destination port number of the data packet is replaced by the first a private network port number, where the source port number of the data packet is the second private network port number, the source port number of the data packet is the second private network port number, and the destination IP address of the data packet The address is the first public network IP address, the destination port number of the data packet is the first public network port number, and the second UE sends the replaced data packet to the First UE;

Or the second UE receives the data packet sent by the first UE by using the direct communication path.

With reference to the first possible implementation manner of the fourth aspect, in a third possible implementation manner of the fourth aspect, the receiving, by the second UE, the handover indication information that is sent by the first UE includes:

The second UE receives the third direct communication request message sent by the first UE, where the third direct communication request message includes: the handover indication information;

Obtaining, by the second UE, the second public network IP address and the second public network port number, including:

The second direct communication request message further includes the second public network IP address and the second public network port number, and the second UE acquires the second public from the third direct communication request message a network IP address and the second public network port number;

Obtaining, by the second UE, the first private network IP address and the first private network port number, including:

The third direct communication request message further includes the first private network IP address and the first private network port number, and the second UE acquires the first private information from the third direct communication request message. The network IP address and the first private network port number.

With reference to the first possible implementation manner of the foregoing aspect, in a fourth possible implementation manner of the fourth aspect, the receiving, by the second UE, the handover indication information that is sent by the first UE includes:

The second UE receives the fourth direct communication request message sent by the first UE, where the fourth direct communication request message includes: the handover indication information;

Obtaining, by the second UE, the second public network IP address and the second public network port number, including:

The second UE sends a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number;

The second UE receives the fourth response message returned by the application server, where the fourth response message includes the second public network IP address and the second public network port number;

Obtaining, by the second UE, the first private network IP address and the first private network port number, including:

The fourth direct communication request message further includes the first private network IP address and the first private network port number, and the second UE acquires the first private information from the fourth direct communication request message. The network IP address and the first private network port number.

With the third possible implementation of the fourth aspect, in a fifth possible implementation manner of the fourth aspect, after the second UE receives the third direct communication request message sent by the first UE, The method further includes:

Returning, by the second UE, a third direct communication response message to the first UE, where the third direct communication response message includes a first public network IP address, a first public network port number, a second private network IP address, and a second private network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port a number of the public network port used by the first UE to communicate with the second UE in the network communication path, where the second private network IP address is the second UE in the network communication path a private network IP address used for communication with the first UE, where the second private network port number is a private network port used by the second UE to communicate with the first UE in the network communication path number.

With the fourth possible implementation of the fourth aspect, in a sixth possible implementation manner of the fourth aspect, the second UE receives the fourth direct communication request message sent by the first UE Thereafter, the method further includes:

The second UE returns a fourth direct communication response message to the first UE, where the fourth direct communication response message includes a second private network IP address and a second private network port number, and the second private network IP address The address is a private network IP address used by the second UE to communicate with the first UE in the network communication path, and the second private network port number is the second UE in the network communication path. The private network port number used to communicate with the first UE.

With reference to the fifth or the sixth possible implementation manner of the foregoing aspect, in a seventh possible implementation manner of the fourth aspect, the third direct communication request message or the fourth direct communication request message is further The application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

A fifth aspect of the present invention provides a first UE, including:

a sending module, configured to send, to the second UE, the handover indication information, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path;

An acquiring module, configured to obtain a first public network IP address and a first public network port number, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path. a public network IP address, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path;

a path establishing module, configured to establish the direct communication path by using the first public network IP address and the first public network port number;

And a communication module, configured to communicate with the second UE on the direct communication path.

With reference to the fifth aspect, in a first possible implementation manner of the fifth aspect, the sending module is specifically configured to:

Sending a first request message to the second UE, where the first request message is used to request to acquire the first public network IP address and the first public network port number, where the first request message includes The switching indication information;

The obtaining module is specifically configured to:

And receiving, by the second UE, the first response message, where the first response message includes: the first public network IP address and the first public network port number.

With reference to the first possible implementation manner of the fifth aspect, in a second possible implementation manner of the fifth aspect, the first request message further includes application identifier information, where the application identifier information is used to indicate the first The two UEs switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

In conjunction with the first or second possible implementation of the fifth aspect, in a third possible implementation manner of the fifth aspect, the first UE further includes:

a receiving module, configured to receive a second request message sent by the second UE, where the second request message is used to request, by the first UE, to acquire a second public network IP address and a second public network port, where The second public network IP address is the public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE in the a public network port number used by the network communication path to communicate with the first UE;

The sending module is further configured to send a second response message to the second UE, where the second response message includes: the second public network IP address and port number and the second public network port number.

With reference to the fifth aspect, in a fourth possible implementation manner of the fifth aspect, the acquiring module is specifically configured to:

Sending a first direct communication request message to the second UE, where the first direct communication request message further includes: a second public network IP address and a second public network port number, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, where the second public network port number is the second UE in the network communication path and the a public network port number used by the first UE communication;

And receiving, by the second UE, the first direct communication response message, where the first direct communication response message includes: the first public network IP address and the first public network port number.

With reference to the fourth possible implementation manner of the fifth aspect, in a fifth possible implementation manner of the fifth aspect, the handover indication information is carried in the first direct communication request message.

With reference to the fifth aspect, in a sixth possible implementation manner of the fifth aspect, the sending module is specifically configured to:

Sending, to the second UE, a second direct communication request message, where the second direct communication request message includes the handover indication information;

The obtaining module is specifically configured to:

Sending a third request message to the application server, where the third request message is used to request to obtain the first public network IP address and the first public network port number;

Receiving a third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number.

With reference to any one of the fourth to sixth possible implementation manners of the fifth aspect, in a seventh possible implementation manner of the fifth aspect, the first direct communication request message or the second direct communication The request message further includes application identification information, where the application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

With reference to the fifth aspect, in an eighth possible implementation manner of the fifth aspect, the communications module is specifically configured to:

Using the first public network IP address as the source IP address of the data packet sent to the second UE, using the first public network port number as the source port number of the data packet, and using the second public network IP address The address is used as the destination IP address of the data packet, and the second public network port number is used as the destination port number of the data packet, and the data packet is sent to the second UE by using the direct communication path, where The second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE a public network port number used by the network communication path to communicate with the first UE.

A sixth aspect of the present invention provides a second UE, including:

a receiving module, configured to receive, by the first UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path;

An obtaining module, configured to obtain a second public network IP address and a second public network port number, where the second public network IP address is used by the second UE to communicate with the first UE in the network communication path a public network IP address, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path;

a path establishing module, configured to use the second public network IP address and the second public network port Number establishing the direct communication path;

And a communication module, configured to communicate with the first UE on the direct communication path.

With reference to the sixth aspect, in a first possible implementation manner of the sixth aspect, the acquiring module is specifically configured to:

Sending a second request message to the first UE, where the second request message is used to request the first UE to acquire the second public network IP address and the second public network port number;

And receiving, by the first UE, a second response message, where the second response message includes: the second public network IP address and the second public network port number.

In conjunction with the first possible implementation of the sixth aspect, in a second possible implementation manner of the sixth aspect, the receiving module is further configured to:

And receiving, by the first UE, the first request message, where the first request message includes the handover indication information, where the first request message is used to request to acquire a first public network IP address and a first public network port number. The first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first a public network port number used by the UE to communicate with the second UE in the network communication path;

Determining, according to the handover indication information, the first public network IP address and the first public network port number used by the first UE and the second UE in the network communication path;

The second UE further includes: a sending module, configured to send the first public network IP address and the first public network port number to the first UE in a first response message.

With reference to the second possible implementation manner of the sixth aspect, in a third possible implementation manner of the sixth aspect, the first request message further includes application identifier information, where the application identifier information is used to indicate the The second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

With reference to the sixth aspect, in a fourth possible implementation manner of the sixth aspect, the acquiring module is specifically configured to:

Receiving, by the first UE, a first direct communication request message, where the first direct communication request message includes the second public network IP address and the second public network port number.

With reference to the fourth possible implementation manner of the sixth aspect, in a fifth possible implementation manner of the sixth aspect, the handover indication information is carried in the first direct communication request message.

In conjunction with the fourth or fifth possible implementation of the sixth aspect, the sixth aspect of the sixth aspect In a possible implementation manner, the second UE further includes:

a sending module, configured to return a first direct communication response message to the first UE, where the first direct communication response message includes: a first public network IP address and a first public network port number, the first public network The IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first UE in the network communication path. A public network port number used for communicating with the second UE.

With reference to the sixth aspect, in a seventh possible implementation manner of the sixth aspect, the receiving module is specifically configured to:

Receiving, by the first UE, a second direct communication request message, where the second direct communication request message includes the handover indication information;

The obtaining module is specifically configured to:

Sending a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number;

Receiving a fourth response message returned by the application server, where the fourth response message includes: the second public network IP address and the second public network port number.

With reference to any one of the fourth to seventh possible implementation manners of the sixth aspect, in the eighth possible implementation manner of the sixth aspect, the first direct communication request message or the second direct The communication request message further includes application identification information, where the application identification information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. .

With reference to the sixth aspect, in a ninth possible implementation manner of the sixth aspect, the second UE is in communication with the first UE on the direct communication path, and the communications module is specifically configured to:

The second public network IP address is used as a source IP address of the data packet sent to the first UE, and the second public network port number is used as a source port number of the data packet, and the first public network IP is used. The address is used as the destination IP address of the data packet, and the first public network port number is used as the destination port number of the data packet, and the data packet is sent to the first UE by using the direct communication path, where The first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, where the first public network port number is the first UE A public network port number used by the network communication path to communicate with the second UE.

A seventh aspect of the present invention provides a first UE, including:

a sending module, configured to send, to the second UE, the handover indication information, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path;

An acquiring module, configured to obtain a first public network IP address and a first public network port number, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path. a public network IP address, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path;

The acquiring module is further configured to obtain a second private network IP address and a second private network port number, where the second private network IP address is the second UE in the network communication path and the first UE a private network IP address used by the communication, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path;

a path establishing module, configured to establish the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number;

And a communication module, configured to communicate with the second UE on the direct communication path.

With reference to the seventh aspect, in a first possible implementation manner of the seventh aspect, the path establishing module is specifically configured to:

Establishing a first correspondence between the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number, and the second public network IP address and the second public network a second corresponding relationship between the port number and the second private network IP address and the second private network port number, wherein the first private network IP address is the first UE in the network communication path a private network IP address used by the second UE to communicate, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path, The second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE A public network port number used to communicate with the first UE in the network communication path.

In conjunction with the first possible implementation of the seventh aspect, in a second possible implementation manner of the seventh aspect, the communications module is specifically configured to:

Substituting the source IP address of the data packet sent to the second UE with the first public network IP address according to the first correspondence, and replacing the source port number of the data packet with the first public network a port number, replacing the destination IP address of the data packet with the second correspondence The second private network IP address, the destination port number of the data packet is replaced with the second private network port number, where the source port number of the data packet is the first private network port number, The source port number of the data packet is the first private network port number, the destination IP address of the data packet is the second public network IP address, and the destination port number of the data packet is the second public network port No., the first UE sends the data packet to the second UE by using the direct communication path;

Or receiving, by the direct communication path, a data packet sent by the second UE.

With reference to the seventh aspect, in a third possible implementation manner of the seventh aspect, the sending module is specifically configured to:

The first UE sends a third direct communication request message to the second UE, where the third direct communication request message includes: the handover indication information;

The obtaining module is specifically configured to:

And receiving, by the second UE, a third direct communication response message, where the third direct communication response message includes: the first public network IP address and the first public network port number;

The third direct communication response message further includes: the second private network IP address and the second private network port number, obtaining the second private network IP address from the third direct communication response message, and The second private network port number.

With reference to the seventh aspect, in a fourth possible implementation manner of the seventh aspect, the sending module is specifically configured to:

Sending a fourth direct communication request message to the second UE, where the fourth direct communication request message includes: the handover indication information;

The acquiring module acquires the first public network IP address and the first public network port number, including:

Sending a third request message to the application server, where the third request message is used to request to obtain the first public network IP address and the first public network port number;

Receiving a third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number;

The acquiring module acquires the second private network IP address and the second private network port number, including:

And receiving, by the second UE, a fourth direct communication response message, where the fourth direct communication response message includes: the second private network IP address and the second private network port number.

With reference to the third possible implementation manner of the seventh aspect, in a fifth possible implementation manner of the seventh aspect, the third direct communication request message further includes: a first private network IP address and a first private network a port number, a second public network IP address, and a second public network port number, where the first private network IP address is a private network used by the first UE to communicate with the second UE in the network communication path. An IP address, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path, and the second public network IP address is the a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the first UE in the network communication path. The public network port number used by the UE for communication.

With reference to the fourth possible implementation manner of the seventh aspect, in a sixth possible implementation manner of the seventh aspect, the fourth direct communication request message further includes: a first private network IP address and a first private network a port number, where the first private network IP address is a private network IP address used by the first UE to communicate with the second UE in the network communication path, where the first private network port number is A private network port number used by the first UE to communicate with the second UE in the network communication path.

With reference to the fifth or the sixth possible implementation manner of the seventh aspect, in a seventh possible implementation manner of the seventh aspect, the third direct communication request message or the fourth direct communication request message is further The application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

An eighth aspect of the present invention provides a second UE, including:

a receiving module, configured to receive, by the first UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path;

An obtaining module, configured to obtain a second public network IP address and a second public network port number, where the second public network IP address is used by the second UE to communicate with the first UE in the network communication path a public network IP address, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path;

The acquiring module is further configured to obtain a first private network IP address and a first private network port number, where the first private network IP address is the first UE in the network communication path and the second UE a private network IP address used by the communication, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path;

a path establishing module, configured to establish the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port;

And a communication module, configured to communicate with the first UE on the direct communication path.

In conjunction with the eighth aspect, in a first possible implementation manner of the eighth aspect, the path establishing module is specifically configured to:

Establishing a first correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number, and the first public network IP address and the first public network a second corresponding relationship between the port number and the first private network IP address and the first private network port number, where the second private network IP address is the second UE in the network communication path The private network IP address used by the first UE to communicate, and the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path, The first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first UE A public network port number used to communicate with the second UE in the network communication path.

With reference to the first possible implementation of the eighth aspect, in a second possible implementation manner of the eighth aspect, the communications module is specifically configured to:

Substituting the source IP address of the data packet sent to the first UE with the second public network IP address according to the first correspondence, and replacing the source port number of the data packet with the second public network And replacing, by the second correspondence, the destination IP address of the data packet with the first private network IP address, and replacing the destination port number of the data packet with the first private network port number, The source port number of the data packet is the second private network port number, the source port number of the data packet is the second private network port number, and the destination IP address of the data packet is the first a public network IP address, the destination port number of the data packet is the first public network port number, and the second UE sends the replaced data packet to the first UE by using the direct communication path;

Or receiving, by the direct communication path, a data packet sent by the first UE.

In conjunction with the first possible implementation of the eighth aspect, in a third possible implementation manner of the eighth aspect, the receiving module is specifically configured to:

Receiving a third direct communication request message sent by the first UE, the third direct communication The request message includes: the switching indication information;

The obtaining module is specifically configured to:

The third direct communication request message further includes the second public network IP address and the second public network port number, and the second public network IP address and the location are obtained from the third direct communication request message. Said second public network port number;

The third direct communication request message further includes the first private network IP address and the first private network port number, and the first private network IP address and the location are obtained from the third direct communication request message. The first private network port number.

With reference to the first possible implementation of the eighth aspect, in a fourth possible implementation manner of the eighth aspect, the receiving module is specifically configured to:

And receiving, by the first UE, a fourth direct communication request message, where the fourth direct communication request message includes: the handover indication information;

The obtaining module acquires the second public network IP address and the second public network port number, including:

Sending a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number;

Receiving a fourth response message returned by the application server, where the fourth response message includes the second public network IP address and the second public network port number;

The acquiring module acquires the first private network IP address and the first private network port number, including:

The fourth direct communication request message further includes the first private network IP address and the first private network port number, and the obtaining module acquires the first private network from the fourth direct communication request message. The IP address and the first private network port number.

In conjunction with the third possible implementation of the eighth aspect, in a fifth possible implementation manner of the eighth aspect, the second UE further includes:

a sending module, configured to return a third direct communication response message to the first UE, where the third direct communication response message includes a first public network IP address, a first public network port number, and a second private network IP address, and a second private network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port Number that the first UE communicates with the second UE in the network communication path a public network port number used, the second private network IP address being a private network IP address used by the second UE to communicate with the first UE in the network communication path, and the second private network port The number is a private network port number used by the second UE to communicate with the first UE in the network communication path.

In conjunction with the fourth possible implementation of the eighth aspect, in a sixth possible implementation of the eighth aspect, the second UE further includes:

a sending module, configured to return a fourth direct communication response message to the first UE, where the fourth direct communication response message includes a second private network IP address and a second private network port number, and the second private network IP address The address is a private network IP address used by the second UE to communicate with the first UE in the network communication path, and the second private network port number is the second UE in the network communication path. The private network port number used to communicate with the first UE.

With reference to the fifth or the sixth possible implementation manner of the eighth aspect, in a seventh possible implementation manner of the eighth aspect, the third direct communication request message or the fourth direct communication request message is further The application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

A ninth aspect of the present invention provides a first UE, where the first UE includes: a processor, a memory, a communication interface, and a system bus, where the memory and the communication interface are connected to the processor through the system bus Communication

The memory is configured to store a computer execution instruction;

The processor, configured to execute the computer to execute instructions, to perform the method of any one of the first to eighth aspects of the first aspect of the invention.

A tenth aspect of the present invention provides a second UE, where the second UE includes: a processor, a memory, a communication interface, and a system bus, where the memory and the communication interface are connected to the processor through the system bus Communication

The memory is configured to store a computer execution instruction;

The processor, configured to execute the computer-executed instructions, to perform the method of any one of the first to ninth aspects of the second aspect of the present invention.

An eleventh aspect of the present invention provides a first UE, where the first UE includes: a processor, a memory, a communication interface, and a system bus, and the memory and the communication interface pass the system a bus is connected to and communicates with the processor;

The memory is configured to store a computer execution instruction;

The processor, configured to execute the computer-executed instructions, to perform the method of any one of the first to seventh aspects of the third aspect and the third aspect of the present invention.

A twelfth aspect of the present invention provides a second UE, where the second UE includes: a processor, a memory, a communication interface, and a system bus, where the memory and the communication interface are connected to the processor through the system bus And communicate;

The memory is configured to store a computer execution instruction;

The processor, configured to execute the computer-executed instructions, to perform the method of any one of the first to seventh aspects of the fourth aspect of the present invention and the second aspect.

The method and device for switching between network communication and direct communication provided by the embodiment of the present invention, the first UE sends the handover indication information to the second UE to indicate that the second UE communicates with the communication path of the first UE from the network. The path is switched to the direct communication path, and the first public network IP address and the first public network port number are obtained, and the first public network IP address and the first public network port number are used to establish a direct communication path. In the method, after the communication path is switched, the data packet sent by the first UE received by the second UE does not change, and the IP address and the port number of the first UE do not change in the second UE, thereby ensuring the user's Business is not interrupted.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present invention, and other drawings can be obtained from those skilled in the art without any inventive labor.

1 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 1 of the present invention;

2 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 2 of the present invention;

3 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 3 of the present invention;

4 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 4 of the present invention;

5 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 5 of the present invention;

6 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 6 of the present invention;

7 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 7 of the present invention;

8 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 8 of the present invention;

9 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 9 of the present invention;

FIG. 10 is a schematic structural diagram of a first UE according to Embodiment 10 of the present invention;

FIG. 11 is a schematic structural diagram of a second UE according to Embodiment 11 of the present invention;

FIG. 12 is a schematic structural diagram of a first UE according to Embodiment 12 of the present invention;

FIG. 13 is a schematic structural diagram of a second UE according to Embodiment 13 of the present invention;

FIG. 14 is a schematic structural diagram of a first UE according to Embodiment 14 of the present invention;

FIG. 15 is a schematic structural diagram of a second UE according to Embodiment 15 of the present invention;

FIG. 16 is a schematic structural diagram of a first UE according to Embodiment 16 of the present invention;

FIG. 17 is a schematic structural diagram of a second UE according to Embodiment 17 of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

In the prior art, the UE transmits data through the network communication path, taking the communication between the first UE and the second UE as an example. If the first UE is to send data to the second UE, the source IP address of the data packet sent by the first UE. The address is its own private IP address, and the source port number is its own private port number. The destination IP address is the public network IP address of UE2 and the destination port number is the public network port number of UE2. The IP address of the private network cannot be routed over the Internet. Therefore, the network address translation (NAT) of the UE is required to be translated into the public IP address of the UE1. The private network port number of UE1 is converted to the public network port number. The router that performs NAT is also called a NAT server. The NAT server can be a single router or integrated on the P-GW. The data packet converted by the NAT server is sent to the Internet for transmission. At the receiving end, after receiving the data packet, the receiving terminal's NAT server converts the destination IP address of the data packet into the private network IP address of UE2, and the data packet is The destination port number is converted to the private network port number of the UE2, and then the converted data packet is sent to the UE2. The source IP address of the data packet received by the UE2 is the public network IP address of the UE1, and the source port number is the public address of the UE1. The network port number, the destination IP address is the private network IP address of UE2, and the destination port number is the private network port number of UE2.

When the data packet sent by UE1 is transmitted on the Internet, it will pass through the eNB, P-GW, S-GW, etc., and the transmission efficiency is low, and the network delay is large. In order to solve this problem, a direct communication path can be used for communication. The direct communication path is a path directly connected between UE1 and UE2. When UE1 and UE2 communicate using a direct communication path, the data packet does not need to pass through any network entity, thereby reducing the number of packets. The delay of packet transmission improves the transmission efficiency.

In the prior art, when UE1 and UE2 want to switch the transmission path from the network communication path to the direct communication path, UE1 and UE2 need to interrupt the network direct communication path first, and then establish a direct communication path, and UE1 and UE2 are in direct communication. The IP address used on the path is different from the IP address used on the network communication path. As the IP address is changed, the service is not continuous.

FIG. 1 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 1 of the present invention. As shown in FIG. 1 , the method in this embodiment may include the following steps:

Step 101: The first UE sends handover indication information to the second UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path.

In this embodiment, the network communication path is a network communication path between the first UE and the second UE, and the first UE is to be switched from the network communication path to the direct communication path, and the premise of the embodiment is the first UE and the second UE. A network communication path has been established, where the network communication path can be LTE The network communication path, the first UE and the second UE establish a network communication path as the prior art is not described too much here. When the first UE and the second UE are relatively close, a direct communication path may be established between the first UE and the second UE, and when the first UE and the second UE communicate through the direct communication path, the data packet does not need to pass through the LTE. The delivery of the core network can save network resources and can reduce the communication delay between the first UE and the second UE.

Step 102: The first UE acquires a first public network (Internet Protocol, IP address) address and a first public network port number.

In this embodiment and the following embodiments, the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first UE in the network communication. a public network port number used by the second UE to communicate with the second UE in the path, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is The public network port number used by the second UE to communicate with the first UE in the network communication path. The first UE and the second UE each know their own private network IP address and private network port number, as well as the public network IP address and public network port number of the other party.

In this embodiment and the following embodiments, the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE in the network communication. a public network port number used by the first UE to communicate with the first UE in the path, where the first private network IP address is a private network IP address used by the first UE to communicate with the second UE in the network communication path, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path, where the second private network IP address is a private network IP address used by the second UE to communicate with the first UE in the network communication path, The second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path.

In this embodiment, the first UE establishes a direct communication path, and needs to obtain the first public network IP address and the first public network port number. The first UE may obtain the first public network IP address and the first manner by using the following three manners. Public network port number:

(1) The first UE sends a first request message to the second UE, where the first request message is used to request to acquire the first public network IP address and the first public network port number, and the second UE sends the first request message to the first UE according to the first request message. Returns the first response message. The first UE receives the first response message returned by the second UE, where the first response message includes: a first public network IP address and a first public network port number.

When the first UE obtains the first public network IP address and the first public network port number by using the first request message Optionally, the first request message may further carry the handover indication information. Of course, the first handover indication information may also be carried in other messages, which is not limited in this embodiment.

Optionally, the first request message further includes application identifier information, where the application identifier information is used to indicate that the second UE switches the communication path of the application corresponding to the application identifier from the network communication path to the direct communication path. The application identifier information may be an application identifier (APP ID). When there are multiple applications between the first UE and the second UE, the first UE may establish a direct communication path for each application. In order to distinguish the direct communication path of each application, each application needs to be carried in the first request message. Application identification information to indicate to the second UE which application the direct communication path belongs to. When there is only one application between the first UE and the second UE, optionally, the application identifier information of the application may not be carried in the first request message.

(2) The first UE sends a first direct communication request message to the second UE, where the first direct communication request message further includes: a second public network IP address and a second public network port number.

The second UE returns a first direct communication response message to the first UE according to the first direct communication request message, and the first UE receives the first direct communication response message returned by the second UE, where the first direct communication response message includes: Public network IP address and first public network port number.

When the first UE obtains the first public network IP address and the first public network port number by using the first direct communication request message, the first UE may send the handover indication information in the first direct communication request message to the first UE. The second UE, of course, the handover indication information can also be carried in other messages.

(3) The first UE sends a third request message to the application server, where the third request message is used to request to acquire the first public network IP address and the first public network port number. The application server is a server that serves communication between the first UE and the second UE. The application server stores the first public network IP address, the first public network port number, the second public network IP address, and the second public network port number. After receiving the third request message sent by the first UE, the application server returns a third response message to the first UE according to the third request message, where the first UE receives the third response message returned by the application server, where the third response message includes: The first public network IP address and the first public network port number.

When the first UE acquires the first public network IP address and the first public network port number through the application server, optionally, the first UE sends the handover indication information to the second UE by using the second direct communication request message, where the second direct communication is performed. The request message includes handover indication information, of course, the first UE also The switching indication information can be carried by other messages.

Optionally, in the second and third manners, the first direct communication request message or the second direct communication request message may further include application identification information.

It should be noted that, in this embodiment, step 101 and step 102 are executed in the same order, or may be performed simultaneously.

Step 103: The first UE establishes a direct communication path by using the first public network IP address and the first public network port number.

Specifically, the first UE establishes an underlying connection by using the first public network IP address and the first public network port number. The first UE may also generate a traffic flow template (TFT) corresponding to the direct communication path, where the matching information of the TFT corresponding to the direct communication path is: the source IP address is the first public network IP address, and the source port number is It is the first public network port number, the destination IP address is the second public network IP address, and the destination port number is the second public network port number.

Before the first UE establishes a direct communication path by using the first public network IP address and the first public network port number, the first UE further receives a second request message sent by the second UE, where the second request message is used to request acquisition from the first UE. a second public network IP address and a second public network port; the first UE sends a second response message to the second UE, where the second response message includes: a second public network IP address and a port number, and a second public network port number.

Step 104: The first UE communicates with the second UE on a direct communication path.

Specifically, the first UE uses the first public network IP address as the source IP address of the data packet sent to the second UE, the first public network port number as the source port number of the data packet, and the second public network IP address. As the destination IP address of the data packet, the second public network port number is used as the destination port number of the data packet, and the data packet is sent to the second UE through the direct communication path. If the first UE generates the TFT, the first UE matches the data packet sent to the second UE to the corresponding direct communication path according to the TFT.

In this embodiment, the TFT corresponding to the direct communication path is different from the TFT corresponding to the network communication path, and the source IP address of the TFT corresponding to the network communication path is the first private network IP address, and the source port number is the first private network. Port number, the source IP address of the TFT corresponding to the direct communication path is the first public network IP address, the source port number is the first public network port number, and the destination IP address of the TFT used by the first UE to transmit data on the two communication paths The destination port number does not change. Both are the second public network IP address and the second public network port number.

In this embodiment, the source IP address of the data packet sent by the first UE through the direct communication path is the public network IP address of the first UE, and the source port number is the public network port number of the first UE. The IP address is the public network IP address of the second UE, and the destination IP address is the public network port number of the second UE. It can be seen that the source address and the source port number of the data packet sent by the first UE through the two communication paths are the same. Therefore, the IP address and the port number of the first UE do not change in the second UE. Thereby ensuring that the user's business is not interrupted.

In this embodiment, the first UE sends the handover indication information to the second UE, to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path, and obtains the first public network IP address. And the first public network port number, using the first public network IP address and the first public network port number to establish a direct communication path. In the method, after the communication path is switched, the data packet sent by the first UE received by the second UE does not change, and the IP address and the port number of the first UE do not change in the second UE, thereby ensuring the user's Business is not interrupted.

2 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 2 of the present invention. As shown in FIG. 2, the method provided in this embodiment may include the following steps:

Step 201: The second UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path.

Step 202: The second UE acquires a second public network IP address and a second public network port number.

The second UE may obtain the second public network IP address and the second public network port number by:

(1) The second UE sends a second request message to the first UE, where the second request message is used to request the first UE to obtain the second public network IP address and the second public network port number. After receiving the second request message, the first UE returns a second response message to the second UE according to the second request message, and the second UE receives the second response message returned by the first UE, where the second response message includes: The network IP address and the second public network port number.

Before the second UE acquires the second public network IP address and the second public network port number, the second UE further receives the first request message sent by the first UE, where the handover indication information is carried in the first request message. The first request message is used to request to obtain the first public network IP address and the first public network port number, and the second UE determines, according to the handover indication information, the first public network IP used by the first UE and the second UE in the network communication path. Address and the first public network port number; the second UE will be the first public network IP address and the first public The network port number is carried in the first response message and sent to the first UE.

Optionally, the first request message further includes application identifier information, where the application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. The application identification information and the handover indication information may also be included in the second request message.

(2) The second UE receives the first direct communication request message sent by the first UE, where the first direct communication request message includes a second public network IP address and a second public network port number. Optionally, the handover indication information may also be carried in the first direct communication request message. Of course, the handover indication information may also be carried in other messages.

After the second UE receives the first direct communication request message sent by the first UE, the second UE returns a first direct communication response message to the first UE according to the first direct communication request message, where the first direct communication response message includes: Public network IP address and first public network port number.

(3) The second UE sends a fourth request message to the application server, where the fourth request message is used to request to obtain the second public network IP address and the second public network port number, and the application server returns to the second UE according to the fourth request message. The fourth response message is sent by the second UE to the second UE. The fourth response message includes: a second public network IP address and a second public network port number.

When the second UE obtains the second public network IP address and the second public network port number through the application server, optionally, the handover indication information is carried in the second direct communication request message, and the second UE receives the first The second direct communication request message includes the handover indication information. Of course, the handover indication information may also be carried in other messages.

In the foregoing second and third manners, optionally, the first direct communication request message or the second direct communication request message further includes application identification information. After the second UE receives the first direct communication request message sent by the first UE, the second UE also returns a first direct communication response message to the first UE, where the first direct communication response message includes: a first public network IP address and a first A public network port number. Or, after the second UE receives the second direct communication request message sent by the first UE, the second UE returns a second direct communication response message to the first UE, where the second direct communication response message includes: application identifier information.

It should be noted that, in this embodiment, step 201 and step 202 are not executed in sequence, and may be performed simultaneously.

Step 203: The second UE establishes a direct use of the second public network IP address and the second public network port number. Communication path.

Specifically, the second UE establishes an underlying connection by using the second public network IP address and the second public network port number. The second UE may also generate a TFT of the direct communication path, where the source IP address of the TFT of the direct communication path is the second public network IP address, the source port number is the second public network port number, and the destination IP address is the first public network. IP address, the destination port number is the first public network port number.

Step 204: The second UE communicates with the first UE on a direct communication path.

Specifically, the second UE uses the second public network IP address as the source IP address of the data packet sent to the first UE, and the second public network port number as the source port number of the data packet, and the first public network IP address. As the destination IP address of the data packet, the first public network port number is used as the destination port number of the data packet, and the data packet is sent to the first UE through the direct communication path. If the second UE generates the TFT corresponding to the direct communication path, the second UE matches the data packet sent to the first UE to the direct communication path according to the TFT corresponding to the direct communication path.

When the second UE transmits data on the network communication path, the source IP address of the second UE sending the data packet is the second private network IP address, the source port number is the second private network port number, and the source IP address of the data packet is NAT. The server is converted into the second public network IP address, and the source port number is converted into the second public network port number by the NAT server, and the NAT server sends the data packet according to the converted second public network IP address and the second public network port number. Give the first UE. When a packet is transmitted on the direct communication path, it does not need to be converted by the NAT server. In the above two communication processes, the source address and the source port number of the data packet sent by the second UE through the two communication paths are the same, and therefore, the IP address of the second UE is seen by the first UE. The port number does not change, thus ensuring that the user's business is not interrupted.

In this embodiment, the second UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path, and obtains The second public network IP address and the second public network port number establish a direct communication path by using the second public network IP address and the second public network port number. In the method, after the communication path is switched, the data packet sent by the second UE received by the first UE does not change, and the IP address and the port number of the second UE do not change in the first UE, thereby ensuring the user's Business is not interrupted.

The methods of Embodiment 1 and Embodiment 2 will be described in detail below through several specific embodiments.

FIG. 3 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 3 of the present invention. As shown in FIG. 3, the method provided in this embodiment may include the following steps:

Step 301: The first UE and the second UE establish a network communication path.

In the LTE system, the network communication path is a path for establishing a PDN connection and a bearer to transmit data, and the first UE is used as an example, and the first UE establishes a PDN connection with the first core network by using the first eNB, where An eNB is an access device of the first UE, and the first core network is an access core network of the first UE, and the first core network includes multiple nodes: a mobility management entity (Mobility Management Entity, MME for short), and a service gateway. (Serving Gateway, SGW for short) and PGW. Specifically, the first UE sends a PDN connectivity request or an attach request to the MME by using the first eNB, and after receiving the PDN connection request or the attach request, the MME sends a create session request to the SGW, and the SGW will The create session request is sent to the PGW, and the PGW allocates the first private network IP address and the first private network port number to the first UE. Then, the PGW creates a session response message, and the session response message includes not only the first private network IP address and the first private network port number allocated by the PGW for the first UE, but also the first private network IP address and The first public network IP address and the second public network port number corresponding to the first private network port number. The second public network IP address and the second public network port number may also be sent to the first UE through the PDN connection establishment process or other messages of the attatch process, where the first UE saves the first private network IP address, the first private network port number, The second public network IP address and the second public network port number, the second UE establishes a PND connection with the second core network, and the process of establishing a PDN connection by the second UE is similar to that of the first UE.

Step 302: The first UE and the second UE communicate through a network communication path.

Step 303: The first UE initiates a discovery process, and determines whether it is closer to the second UE.

If the first UE finds that it is closer to the second UE, the first UE determines to switch from the network communication path to the direct communication path, and how the first UE finds the second UE is a prior art, which is not described too much here.

Step 304: The first UE and the second UE exchange their respective Layer 2 IDs (layer2ID) in the discovery process.

Optionally, in the process of the discovery, the first UE may also acquire the layer 2 identifier of the second UE, but the second UE does not acquire the layer 2 identifier of the first UE. If the first UE and the second UE are transmitting The first UE and the second UE can also exchange the Layer 2 identifiers through the application layer message, and the Layer 2 identifiers are used for the second layer to identify the Layer 2 identifiers of the second UE. Establish a Layer 2 connection on the direct communication path.

Step 305: The first UE and the second UE authenticate each other to establish a secure Layer 2 connection on the direct communication path.

Step 306: The first UE sends a first request message to the second UE, where the first request message includes the handover indication information and the APP ID.

The first request message is used to request to obtain the first public network IP address and the first public network port number. Optionally, the first request message carries the identifier of the first UE, and the identifier of the first UE may be an application layer. ), or (Mobile Subscriber International ISDN/PSTN number, MSISDN for short). According to different implementations of the discovery process, whether the identifier of the first UE is carried in the first request message includes:

(1) If the first UE and the second UE exchange the mutual layer 2 identifiers in the discovery process, the first request message may or may not carry the identifier of the first UE.

(2) If the second layer of the second UE is obtained by the owner in the discovery process, and the second UE does not obtain the layer 2 identifier of the first UE, the first request message needs to carry the identifier of the first UE.

(3) The first UE and the second UE do not need to carry the identifier of the first UE in the first request message if the second layer identifier of the first UE is exchanged by the application layer message.

Step 307: The second UE matches the handover indication information and the APP ID to the communication session with the first UE, and acquires the first public network IP and the first public network port number used by the first UE in the communication session.

Step 308: The second UE sends a first request response message to the first UE, where the first request response message includes a first public network IP and a first public network port number.

Step 309: The second UE sends a second request message to the first UE, where the second request message includes an APP ID.

The second request message is used to request the first UE to acquire the second public network IP address and the second public network port number. The second request message includes an APP ID. Optionally, the second request message further includes the handover indication information, the handover indication information included in the second request message, the APP ID, and the handover indication information included in the first request message, and the APP. The ID is the same, optional, and the second request message is also The identifier of the second UE is included.

Step 310: The first UE matches the handover indication information and the APP ID to the communication session with the second UE, and acquires the second public network IP and the second public network port number used by the second UE in the communication session.

Step 311: The first UE sends a second request response message to the second UE, where the second request response message includes a second public network IP and a second public network port number.

Step 312: The first UE and the second UE establish a direct communication path.

The first UE establishes a direct communication path by using the first public network IP and the first public network port number, and the second UE establishes a direct communication path by using the second public network IP and the second public network port number. For the first UE and the second UE to establish a direct communication path, a TFT may also be generated. For the specific generation manner, refer to the related descriptions of the first embodiment and the second embodiment, and details are not described herein again.

Step 313: The first UE and the second UE communicate on a direct communication path.

For the process of the first UE and the second UE communicating on the direct communication path, refer to the related descriptions of the first embodiment and the second embodiment, and details are not described herein again.

4 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 4 of the present invention. As shown in FIG. 4, the method provided in this embodiment may include the following steps:

Step 401: The first UE and the second UE establish a network communication path.

Step 402: The first UE and the second UE communicate through a network communication path.

Step 403: The first UE initiates a discovery process, and determines whether it is closer to the second UE.

Step 404: The first UE and the second UE exchange their respective Layer 2 identifiers in the discovery process.

Step 405: The first UE and the second UE authenticate each other to establish a secure Layer 2 connection on the direct communication path.

The specific implementation of the steps 401-405 is the same as the third embodiment of the third embodiment 301-305. Please refer to the description of the third embodiment, and details are not described herein again.

Step 406: The first UE sends a first direct communication request message to the second UE, where the first direct communication request message includes the handover indication information, the APP ID, the second public network IP address, and the second public network port number.

Optionally, the first direct communication request message may further include an identifier of the first UE.

Step 407: The second UE returns a first direct communication request response message to the first UE, where the first direct communication request response message includes an APP ID, a first public network IP address, and a first public network port number.

After receiving the first direct communication request message sent by the first UE, the second UE saves the second public network IP address and the second public network port number, and matches the communication session with the first UE according to the handover indication information and the APP ID. Obtaining a first public network IP address and a first public network port number used by the first UE in the communication session, and generating a first direct communication request response message. Optionally, the first direct communication response message may further include The identity of the second UE.

It should be noted that step 407 and step 408 are not sequential in execution, and may be performed in parallel.

Step 408: The first UE and the second UE establish a direct communication path.

The first UE establishes a direct communication path by using the first public network IP and the first public network port number, and the second UE establishes a direct communication path by using the second public network IP and the second public network port number. For the first UE and the second UE to establish a direct communication path, a TFT may also be generated. For the specific generation manner, refer to the related descriptions of the first embodiment and the second embodiment, and details are not described herein again.

The second UE establishes a direct communication path according to the second public network IP address and the second public network port number.

Step 409: The first UE returns a direct communication path establishment complete message to the second UE.

After the first UE successfully establishes the direct communication path, the first UE returns a direct communication path setup complete message to the second UE, and notifies the second UE that the direct communication path is successfully established.

Step 410: The first UE and the second UE communicate by using a direct communication path.

For the process of the first UE and the second UE communicating on the direct communication path, refer to the related descriptions of the first embodiment and the second embodiment, and details are not described herein again.

FIG. 5 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 5 of the present invention. As shown in FIG. 5, the method provided in this embodiment may include the following steps:

Step 501: The first UE and the second UE establish a network communication path.

Step 502: The first UE and the second UE communicate by using a network communication path.

Step 503: The first UE initiates a discovery process, and determines whether it is closer to the second UE.

Step 504: The first UE and the second UE exchange their respective Layer 2 identifiers in the discovery process.

Step 505: The first UE and the second UE authenticate each other to establish a secure Layer 2 connection on the direct communication path.

The specific implementation of the steps 501-505 is the same as the third embodiment of the third embodiment 301-305. Please refer to the description of the third embodiment, and details are not described herein again.

Step 506: The first UE sends a third request message to the application server.

The third request message is used to request to obtain the first public network IP address and the first public network port number. Optionally, the third request message includes the identifier information of the second UE, so that the application server returns the first public network IP address and the first public network port number of the session with the second UE.

Step 507: The application server returns a third response message to the first UE, where the third response message includes the first public network IP address and the first public network port number.

Step 508: The first UE sends a second direct communication request message to the second UE, where the second direct communication request message includes the handover indication information and the APP ID.

Step 509: The second UE sends a fourth request message to the application server.

The fourth request message is used to request to obtain the second public network IP address and the second public network port number. Optionally, the fourth request message includes the identifier information of the first UE, so that the application server returns a second public network IP address and a second public network port number of the session with the first UE.

Step 510: The application server returns a fourth response message to the second UE, where the fourth response message includes a second public network IP address and a second public network port number.

Step 511: The second UE returns a second direct communication response message to the first UE.

The second direct communication response message may include identification information of the second UE.

Step 512: The first UE and the second UE establish a direct communication path.

The first UE establishes a direct communication path by using the first public network IP and the first public network port number, and the second UE establishes a direct communication path by using the second public network IP and the second public network port number. For the first UE and the second UE to establish a direct communication path, a TFT may also be generated. For the specific generation manner, refer to the related descriptions of the first embodiment and the second embodiment, and details are not described herein again.

Step 513: The first UE and the second UE communicate by using a direct communication path.

For the process of the first UE and the second UE communicating on the direct communication path, refer to the related descriptions of the first embodiment and the second embodiment, and details are not described herein again.

It should be noted that the first direct communication request message and the second direct communication request message mentioned in the first embodiment to the fifth embodiment may be implemented by using the same message type, or may be different. The message type is implemented. When the first direct communication request message and the second direct communication request message are implemented by the same message type, the first direct communication response message and the second direct communication response message are also implemented by the same message type. In addition, the first request message and the second request message may be implemented by using the same message type, or may be implemented by using different message types. The third request message and the fourth request message may be implemented by using the same message type, or may be different. The message type is implemented. When the first request message and the second request message adopt the same message type, the first response message and the second response message also adopt the same message type, when the third request message and the fourth request message adopt the same The third response message and the fourth response message also use the same message type when the message type is used.

Optionally, on the basis of the first to fifth embodiments, the first UE may further carry a public safety indication in the process of establishing a direct communication path, where the public security indication is used to indicate the P- serving for the first UE. After the network communication path is released, the GW saves the private network IP address of the first UE, so that the first UE needs to allocate the private network IP address of the first UE to the first UE when the communication path needs to be switched from the direct communication path to the network communication path. The address, so as to ensure that the user's business is not interrupted. The public safety indication can be implemented by a PDN connection request message or a Protocol Configuration Options (PCO) field or a request type field of the attach request message. If the public security indication is carried by the request type, the eNB sends the public security indication to the MME. In the process of establishing the PDN connection, if the MME's subscription data is configured with the private IP address of the public safty UE, The MME sends the private network IP address to the PGW, and the PGW saves and allocates the private network IP address to the UE, so that after the first UE switches to the direct communication path and returns to the network communication path, the PGW can allocate the first UE. The same private IP address. If the public security indication is carried by the request type, the public security indication may be saved in the MME and not sent to the PGW. When the MME initiates the release of the PDN connection, the public security indication is included in the delete session request, so that the PGW saves the private The IP address of the network, so that after the first UE switches to the direct communication path and returns to the network communication path, the PGW can allocate the same private network IP address to the first UE.

If the first UE does not need to switch the communication path from the direct communication path to the network communication path, there is no need to carry a public safety indication in the process of establishing the network communication path. Similarly, the second UE may also carry a public security indication in the process of establishing a direct communication path. The following will be explained by a specific embodiment:

FIG. 6 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 6 of the present invention. As shown in FIG. 6, the method provided in this embodiment may include the following steps:

Step 601: The first UE and the second UE communicate by using a direct communication path.

The premise of this embodiment is that the first UE and the second UE have switched the communication path switching from the network communication path to the direct communication path, and communicated using the direct communication path.

Step 602: In the communication process, the first UE determines that the communication quality of the direct communication path is lower than a preset threshold.

During the passing of the first UE, the communication quality of the direct communication path is detected. When the communication quality of the direct communication path is lower than the preset threshold, the first UE may switch the communication path from the direct communication path to the network communication path.

Step 603: The first UE establishes a PDN connection with the first core network, and carries public security indication information during the establishment process.

When the first UE determines to switch from the direct communication path to the network communication path, if the first network communication path is not released, the first UE directly switches the communication path from the direct communication path to the first network communication path, in this embodiment. The first network communication path is a network communication path used before the first UE switches to the direct communication path. If the first network communication path has been released, the second network communication path needs to be established, and the private network IP address used for communication in the second network communication path allocated for the first UE and the first UE are in the first network. The private network IP address used for communication on the communication path is the same, so that the service of the user after the handover is not interrupted.

Specifically, the first UE may include public security indication information in the PCO of the attach request or the PDN connection request, and the PGW may be the first UE according to the saved private network IP address used by the first UE to communicate on the first network communication path. The private network IP address used for communication on the first network communication path is allocated to the first UE as the private network IP address used by the first UE on the second network communication path.

Step 604: The first core network sends the allocated private network IP address to the first UE.

Step 605: The first UE establishes a second network communication path according to the private network IP address allocated by the first core network.

Specifically, the first UE establishes a bearer of the communication session with the second UE according to the private network IP address allocated by the first core network, and the first UE may further generate the second network according to the private network IP address allocated by the first core network. TFT corresponding to the communication path, and the TFT corresponding to the second network communication path In the configuration information, the source IP address is the private network IP address assigned by the first core network, and the source port number is the private network port number used by the second UE to communicate with the second UE, and the destination IP address is the second public network IP address. Address, destination port number is the second public network port number.

Step 606: The first UE sends a direct communication cancellation request message to the second UE.

The direct communication cancellation request message includes handover indication information, and the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the direct communication path to the second network communication path.

Step 607: The second UE and the second core network establish a PDN connection, and carry the public security indication information in the establishing process.

Step 608: The second core network sends the allocated private network IP address to the second UE.

The PGW in the second core network includes a private network IP address used by the second UE to communicate on the first network communication path, and the second core network uses the private network IP used by the second UE to communicate on the first network communication path. The address is the private network IP address used by the second UE to communicate on the second network communication path.

Step 609: The second UE establishes a second network communication path according to the private network IP address allocated by the second core network.

Specifically, the second UE establishes a bearer of the communication session with the first UE according to the private network IP address allocated by the second core network, and the second UE may further generate a second according to the private network IP address allocated by the second core network. The TFT corresponding to the network communication path and the matching information of the TFT corresponding to the second network communication path: the source address is a private network IP address allocated by the second core network, and the source port number is used by the second UE for use with the first UE. The private network port number of the communication. The destination IP address is the first public network IP address, and the destination port number is the first public network port number.

Step 610: The second UE sends a direct communication cancellation response message to the first UE.

In the method of this embodiment, after the first UE and the second UE switch the communication path from the network communication path to the direct communication path, if the communication quality of the direct communication path is not good, the first UE and the second UE may further connect the communication path. Switching from the direct communication path to the network communication path, and ensuring that the user's service is not interrupted during the handover.

FIG. 7 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 7 of the present invention. As shown in FIG. 7, the method provided in this embodiment may include the following steps:

Step 701: The first UE sends handover indication information to the second UE, where the indication information is used for handover. And indicating that the communication path between the second UE and the first UE is switched from the network communication path to the direct communication path.

Optionally, the first UE sends the handover indication information to the second UE, where the first UE sends a third direct communication request message or a fourth direct communication request message to the second UE, where the third direct communication request message or the first The four direct communication request message includes the handover indication information. Of course, the first UE may also send the handover indication information by using other messages. In this embodiment, the third direct communication request message further includes a first private network IP address, a first private network port number, a second public network IP address, and a second public network port number; and the fourth direct communication request message is further The method may include: a first private network IP address and a first private network port number.

Optionally, the third direct communication request message or the fourth direct communication request message further includes application identification information.

Step 702: The first UE acquires a first public network IP address and a first public network port number.

Step 703: The first UE acquires a second private network IP address and a second private network port number.

In an implementation manner, the first UE acquires the first public network IP address and the first public network port number, specifically: the first UE receives the third direct communication response message returned by the second UE, and the third direct communication response message is The second UE is returned according to the third direct communication request message, where the third direct communication response message includes: a first public network IP address and a first public network port number. The third direct communication response message may further include: a second private network IP address and a second private network port number, where the first UE obtains the second private network IP address and the second private network port number from the third direct communication response message. .

In another implementation manner, the first UE acquires the first public network IP address and the first public network port number, where the first UE sends a third request message to the application server, and the third request message is used to request to obtain the first a public network IP address and a first public network port number. Optionally, the third request message includes the identifier information of the second UE, so that the application server returns the first public IP address of the session with the second UE. The first public network port number. The application server returns a third response message to the first UE according to the third request message, where the first UE receives the third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number. . Correspondingly, the first UE acquires the second private network IP address and the second private network port number, specifically: the first UE receives the fourth direct communication response message returned by the second UE according to the fourth direct communication request message, and the fourth direct The communication response message includes: a second private network IP address and a second private network port number.

It should be noted that, in this embodiment, the steps 701-703 are not in the order of execution. And can be executed at the same time; and the third request message and the third direct communication request message in the step 703 are not in the order of execution, and can be executed simultaneously.

Step 704: The first UE establishes a direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number.

In this embodiment, after acquiring the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number, the first UE does not need to establish a direct communication path through signaling interaction. The first public network IP address, the first public network port number, the second private network IP address, and the second private network port number are established according to the first public network IP address, the first public network IP address, and the first public network port number. The first correspondence between the first private network IP address and the first private network port number, and the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number The second correspondence. In the process of establishing a direct communication path, the first UE may also generate a TFT corresponding to the direct communication path. In this embodiment, the TFT corresponding to the direct communication path is the same as the TFT corresponding to the network communication path, and the source IP of the TFT corresponding to the direct communication path. The address is the first private network IP address, the source port number is the first private network port number, the destination IP address is the second public network IP address, and the destination port number is the second public network port number, but the TFT of the direct communication path takes precedence. The level is higher than the priority of the network communication path, thereby ensuring that the TFT of the direct communication path is preferentially used when the first UE sends a data packet to the second UE.

Step 705: The first UE communicates with the second UE on the direct communication path.

In this embodiment, in order to maintain the continuity of the user service, the application layer of the first UE uses the first private network IP address as the source IP address of the data packet when encapsulating the data packet sent to the second UE. A private network port number is used as the source port number of the data packet, the second public network IP address is used as the destination IP address of the data packet, and the second public network port number is used as the destination port number of the data packet. The encapsulated data packet is the same as the data packet transmitted on the network communication path, and therefore, the application layer of the first UE sees that the network communication path and the data packet on the direct communication path are the same.

In order to enable the second UE to receive the data packet on the direct communication path and the data packet received on the network communication path, a proximity service layer may be added to the first UE, and the proximity service layer is used according to the first correspondence. The source IP address, the source port number, the destination IP address, and the destination port number of the data packet are modified by the second correspondence. Specifically, the proximity service layer of the first UE replaces the source IP address of the data packet sent to the second UE with the first public network IP address according to the first correspondence, and replaces the source port number of the data packet with the first public Network port number, according to the second correspondence The destination IP address of the data packet is replaced with the second private network IP address, and the destination port number of the data packet is replaced with the second private network port number, and the first UE sends the data packet to the second UE by using the direct communication path. . The data packet sent by the first UE through the direct communication path is the same as the data packet sent by the first UE through the network communication path, that is, the source IP address of the first UE before and after the communication path is switched by the second UE. The source port number, the destination IP address, and the destination port number are unchanged, so that the service on the second UE is not interrupted. The first UE may also receive the data packet sent by the second UE by using a direct communication path.

The difference between this embodiment and the first embodiment is that, in the first embodiment, the source IP address and the source port number of the data packet sent by the first UE through the direct communication path and the network communication path are the same, but the destination IP address. The address and destination port number are different. In this embodiment, the source IP address and the source port number of the data packet sent by the first UE through the direct communication path and the network communication path are the same, and the destination IP address and the destination port number are also the same.

In this embodiment, the first UE sends the handover indication information to the second UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path, and obtains the first The public network IP address, the first public network port number, the second private network IP address, and the second private network port number are based on the first public network IP address, the first public network port number, the second private network IP address, and the second The private network port number establishes a direct communication path, and the direct communication path is used to communicate with the second UE. The method ensures that the service of the user is not interrupted before and after the communication path is switched by the first UE.

FIG. 8 is a flowchart of a method for switching between network communication and direct communication according to Embodiment 8 of the present invention. As shown in FIG. 8, the method provided in this embodiment may include the following steps:

Step 801: The second UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path.

Optionally, the handover indication information is carried in the third direct communication request message or the fourth direct communication request message, and the second UE receives the third direct communication request message or the fourth direct communication request message sent by the first UE, from the third The handover indication information is obtained in the direct communication request message or the fourth direct communication request message. Of course, the handover indication information may also be carried in other messages. Optionally, the third direct communication request message or the fourth direct communication request message may further include application identification information.

Step 802: The second UE acquires a second public network IP address and a second public network port number.

Step 803: The second UE acquires the first private network IP address and the first private network port number.

In an implementation manner, the third direct communication request message further includes a second public network IP address, a second public network port number, a first private network IP address, and a first private network port number, where the second UE is directly from the third The second public network IP address, the second public network port number, the first private network IP address, and the first private network port number are obtained in the communication request message.

In another implementation manner, the second UE sends a fourth request message to the application server, where the fourth request message is used to request to obtain the second public network IP address and the second public network port number, optionally, in the fourth request message. The identifier information of the first UE is included, so that the application server returns a second public network IP address and a second public network port number of the session with the first UE. After receiving the fourth request message, the application server returns a fourth response message to the second UE according to the fourth request message, where the fourth response message includes the second public network IP address and the second public network port number. Correspondingly, the second UE obtains the first private network IP address and the first private network port number from the fourth direct communication request message, where the fourth direct communication request message includes the first private network IP address and the first private network port number. .

After the second UE receives the third direct communication request message sent by the first UE, the second UE also returns a third direct communication response message to the first UE, where the third direct communication response message includes the first public network IP address, A public network port number, a second private network IP address, and a second private network port number.

After the second UE receives the fourth direct communication request message sent by the first UE, the second UE also returns a fourth direct communication response message to the first UE, where the fourth direct communication response message includes the second private network IP address and the first Second private network port number.

It should be noted that, in this embodiment, the steps 801-803 are not executed in sequence, and may be performed simultaneously; and the fourth request message and the fourth direct communication request message in the step 803 are not in the order of execution. And can be executed simultaneously

Step 804: The second UE establishes a direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port.

Specifically, the second UE establishes an underlying connection according to the second public network IP address, the second public network port number, the first private network IP address, and the first private network port, and establishes a second public network IP address and a second public network. The first correspondence between the port number and the second private network IP address and the second private network port number, and the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number The second correspondence. During the establishment process, the second UE may also generate a direct communication path corresponding to In the embodiment, the TFT corresponding to the direct communication path is the same as the TFT corresponding to the network communication path, and the source IP address of the TFT corresponding to the direct communication path is the second private network IP address, and the source port number is the second private network port number. The destination IP address is the first public network IP address, and the destination port number is the first public network port number, but the priority of the TFT of the direct communication path is higher than the priority of the network communication path, thereby ensuring that the second UE is to the first UE. The TFT of the direct communication path is preferred when sending a packet.

Step 805: The second UE communicates with the first UE on a direct communication path.

Specifically, the second UE replaces the source IP address of the data packet sent to the first UE with the second public network IP address according to the first correspondence, and replaces the source port number of the data packet with the second public network port number. Replace the destination IP address of the data packet with the first private network IP address, and replace the destination port number of the data packet with the first private network port number, where the source port number of the data packet is the first The port number of the second private network, the source port number of the data packet is the second private network port number, the destination IP address of the data packet is the first public network IP address, and the destination port number of the data packet is the first public network port number. And the second UE sends the replaced data packet to the first UE by using a direct communication path. The second UE may also receive the data packet sent by the first UE by using a direct communication path. For a specific implementation of this step, reference may be made to the related description of step 705 in Embodiment 7, and details are not described herein again.

In this embodiment, in order to maintain the continuity of the user service, the application layer of the second UE uses the second private network IP address as the source IP address of the data packet when encapsulating the data packet sent to the first UE. The second private network port number is used as the source port number of the data packet, the first public network IP address is used as the destination IP address of the data packet, and the first public network port number is used as the destination port number of the data packet. The encapsulated packet is the same as the packet sent on the network communication path. The data packets transmitted in the network communication path need to undergo address translation by the NAT server on the first UE side and the second UE side.

During the transmission of the direct communication path, the first UE needs to replace the source and destination IP addresses of the data packet with the source and destination port numbers, so that the source IP address and source port of the second UE before and after the first UE seems to be switched. The number and the destination IP address and the destination port number are unchanged, so that the service on the first UE is not interrupted.

The ninth embodiment of the present invention uses a specific embodiment to describe the technical solutions of the seventh embodiment and the eighth embodiment in detail. FIG. 9 is a signaling flowchart of a method for switching between network communication and direct communication according to Embodiment 9 of the present invention. As shown in FIG. 9, the method provided in this embodiment may include Including the following steps:

Step 901: The first UE and the second UE respectively establish a network communication path.

Step 902: The first UE and the second UE communicate through a network communication path.

Step 903: The first UE initiates a discovery process, and determines whether it is closer to the second UE.

Step 904: The first UE and the second UE exchange their respective Layer 2 identifiers in the discovery process.

Step 905: The first UE and the second UE authenticate each other to establish a secure Layer 2 connection on the direct communication path.

The specific implementation of the steps 901-905 is the same as the third embodiment of the third embodiment 301-305. Please refer to the description of the third embodiment, and details are not described herein again.

Step 906: The first UE sends a third request message to the application server.

Step 907: The application server returns a third response message, where the third response message includes a first public network IP address and a first public network port number.

Step 908: The first UE sends a fourth direct communication request message to the second UE, where the fourth direct communication request message includes the handover indication information, the APP ID, the first private network IP address, and the first private network port number.

Optionally, the identifier of the first UE may also be included in the fourth direct communication request message.

Step 909: The second UE sends a fourth request message to the application server according to the handover indication information and the APP ID.

Step 910: The application server returns a fourth response message to the second UE, where the second public network IP address and the second public network port number are in the fourth response message.

Step 911: The second UE establishes and saves a first correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number, and the first public network IP address, The second correspondence between the first public network port number and the first private network IP address and the first private network port number.

Step 912: The second UE returns a fourth direct communication response message to the first UE, where the fourth direct communication response message includes a second private network IP address and a second private network port number.

Step 913: The second UE establishes and saves a first public network IP address, a first public network port number, a first private network IP address, a first private network port number, and a second public network IP address. The second correspondence between the address, the second public network port number, the second private network IP address, and the second private network port number.

Step 914: The first UE and the second UE communicate on a direct communication path.

For the communication process of the first UE and the second UE on the direct communication path, refer to the related descriptions of the seventh embodiment and the eighth embodiment, and details are not described herein again.

It should be noted that the third direct communication request message and the fourth direct communication request message mentioned in the seventh embodiment to the ninth embodiment may be implemented by using the same message type, or may be implemented by using different message types. When the communication request message and the fourth direct communication request message adopt the same message type, the third direct communication response message and the fourth direct communication response message are also implemented by the same message type of the same message type. In addition, the third request message and the fourth request message may be implemented by using the same message type, or may be implemented by using different message types. When the third request message and the fourth request message adopt the same message type, the third response message and The fourth response message also uses the same message type.

10 is a schematic structural diagram of a first UE according to Embodiment 10 of the present invention. As shown in FIG. 10, the first UE provided in this embodiment includes: a sending module 11, an obtaining module 12, a path establishing module 13, and a communication module 14.

The sending module 11 is configured to send, to the second UE, handover indication information, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path;

The obtaining module 12 is configured to obtain a first public network IP address and a first public network port number;

The path establishing module 13 is configured to establish the direct communication path by using the first public network IP address and the first public network port number;

The communication module 14 is configured to communicate with the second UE on the direct communication path.

In a first implementation manner, the sending module 11 is specifically configured to: send a first request message to the second UE, where the first request message is used to request to obtain the first public network IP address and the first a public network port number, where the first request message includes the handover indication information. Correspondingly, the acquiring module 12 is specifically configured to: receive the first response message returned by the second UE, where the first response message includes: the first public network IP address and the first public network port number.

Optionally, the first request message further includes application identifier information, where the application identifier information is used to indicate that the second UE sends the communication path under the application corresponding to the application identifier from the The network communication path is switched to the direct communication path.

Optionally, the first UE further includes: a receiving module, configured to receive a second request message sent by the second UE, where the second request message is used to request the first UE to acquire a second public network The IP address and the second public network port; correspondingly, the sending 11 module is further configured to send a second response message to the second UE, where the second response message includes: the second public network IP address And a port number and the second public network port number.

In the second implementation manner, the acquiring module 12 is specifically configured to: send a first direct communication request message to the second UE, where the first direct communication request message further includes: a second public network IP address and a Receiving, by the second public network port number, the first direct communication response message returned by the second UE, where the first direct communication response message includes: the first public network IP address and the first public network port number. Correspondingly, the handover indication information may be carried in the first direct communication request message.

In a third implementation manner, the sending module 11 is specifically configured to: send a second direct communication request message to the second UE, where the second direct communication request message includes the switching indication information; The obtaining module 12 is specifically configured to: send a third request message to the application server, where the third request message is used to request to obtain the first public network IP address and the first public network port number; and then receive the The third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number.

Optionally, the first direct communication request message or the second direct communication request message further includes application identification information.

In this embodiment, the communication module 14 is specifically configured to:

Using the first public network IP address as the source IP address of the data packet sent to the second UE, using the first public network port number as the source port number of the data packet, and using the second public network IP address The address is used as the destination IP address of the data packet, and the second public network port number is used as the destination port number of the data packet, and the data packet is sent to the second UE by using the direct communication path.

The first UE provided in this embodiment may be used to perform the methods in the first embodiment and the third embodiment to the sixth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 11 is a schematic structural diagram of a second UE according to Embodiment 11 of the present invention. As shown in FIG. 11, the second UE provided in this embodiment includes: a receiving module 21, an obtaining module 22, a path establishing module 23, and a communication module 24. .

The receiving module 21 is configured to receive the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path. ;

The obtaining module 22 is configured to obtain a second public network IP address and a second public network port number.

The path establishing module 23 is configured to establish the direct communication path by using the second public network IP address and the second public network port number;

The communication module 24 is configured to communicate with the first UE on the direct communication path.

In the first implementation manner, the acquiring module 22 is specifically configured to: send a second request message to the first UE, where the second request message is used to request the first UE to acquire the second public network. An IP address and the second public network port number; receiving the second response message returned by the first UE, where the second response message includes: the second public network IP address and the second public network port number.

Optionally, the receiving module 21 is further configured to: receive the first request message sent by the first UE, where the first request message includes the handover indication information, where the first request message is used to request acquisition a first public network IP address and a first public network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, The first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path; determining, according to the handover indication information, the first UE and The first public network IP address and the first public network port number used by the second UE in the network communication path. Correspondingly, the second UE further includes: a sending module, configured to send the first public network IP address and the first public network port number to the first UE in a first response message.

Optionally, the first request message further includes application identifier information, where the application identifier information is used to indicate that the second UE sends the communication path under the application corresponding to the application identifier from the network communication path. Switch to the direct communication path.

In a second implementation manner, the acquiring module 22 is specifically configured to: receive a first direct communication request message sent by the first UE, where the first direct communication request message includes the second public network IP address and The second public network port number. Correspondingly, the handover indication information may be carried in the first direct communication request message. The second UE further includes: a sending module, configured to return a first direct communication response message to the first UE, where the first direct communication response is cancelled The information includes: the first public network IP address and the first public network port number.

In a third implementation manner, the receiving module 21 is specifically configured to: receive a second direct communication request message sent by the first UE, where the second direct communication request message includes the switching indication information. Correspondingly, the obtaining module 22 is specifically configured to: send a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number; The fourth response message returned by the application server, where the fourth response message includes: the second public network IP address and the second public network port number.

Optionally, the first direct communication request message or the second direct communication request message further includes application identification information, where the application identification information is used to indicate that the second UE uses the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path.

In this embodiment, the communication module is specifically configured to: use the second public network IP address as a source IP address of a data packet sent to the first UE, and use the second public network port number as the The source port number of the data packet, the first public network IP address is used as the destination IP address of the data packet, and the first public network port number is used as the destination port number of the data packet, and the data packet is directly A communication path is sent to the first UE.

The second UE provided in this embodiment may be used to perform the methods in the second embodiment to the sixth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 12 is a schematic structural diagram of a first UE according to Embodiment 12 of the present invention. As shown in FIG. 12, the first UE provided in this embodiment includes: a sending module 31, an obtaining module 32, a path establishing module 33, and a communication module 34. .

The sending module 31 is configured to send, to the second UE, handover indication information, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path;

The obtaining module 32 is configured to obtain the first public network IP address and the first public network port number;

The obtaining module 32 is further configured to obtain a second private network IP address and a second private network port number.

The path establishing module 33 is configured to establish the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number;

The communication module 34 is configured to communicate with the second UE on the direct communication path.

In this embodiment, the path establishing module 33 is specifically configured to: establish the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number. Corresponding relationship, and a second correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number.

The communication module 34 is specifically configured to: replace, according to the first correspondence, a source IP address of a data packet sent to the second UE with the first public network IP address, and a source port of the data packet. The number is replaced by the first public network port number, and the destination IP address of the data packet is replaced with the second private network IP address according to the second correspondence, and the destination port number of the data packet is replaced with The second private network port number, wherein the source port number of the data packet is the first private network port number, and the source port number of the data packet is the first private network port number, the data The destination IP address of the packet is the second public network IP address, the destination port number of the data packet is the second public network port number, and the first UE sends the data packet through the direct communication path. Giving the second UE; or receiving, by the direct communication path, a data packet sent by the second UE.

In an implementation manner, the sending module 31 is specifically configured to: send a third direct communication request message to the second UE, where the third direct communication request message includes: the switching indication information; the acquiring module The specific one is: receiving the third direct communication response message that is returned by the second UE, where the third direct communication response message includes: the first public network IP address and the first public network port number; The third direct communication response message further includes: the second private network IP address and the second private network port number, and the obtaining module 32 acquires the second private from the third direct communication response message The network IP address and the second private network port number.

In another implementation manner, the sending module 31 is specifically configured to: send a fourth direct communication request message to the second UE, where the fourth direct communication request message includes: the handover indication information. The obtaining, by the obtaining module 32, the first public network IP address and the first public network port number, includes: sending a third request message to the application server, where the third request message is used to request to acquire the first public Receiving a third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number. The obtaining, by the obtaining module 32, the second private network IP address and the second private network port number, includes: receiving a fourth direct communication response message returned by the second UE, where the fourth direct communication response message is The method includes: the second private network IP address and the first Second private network port number.

Optionally, the third direct communication request message further includes: a first private network IP address and a first private network port number, a second public network IP address, and a second public network port number.

Optionally, the fourth direct communication request message further includes: a first private network IP address and a first private network port number.

Optionally, the third direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate that the second UE uses the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path.

The first UE provided in this embodiment may be used to perform the solution provided in the seventh embodiment and the eighth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 13 is a schematic structural diagram of a second UE according to Embodiment 13 of the present invention. As shown in FIG. 13, the second UE provided in this embodiment includes: a receiving module 41, an obtaining module 42, a path establishing module 43, and a communication module 44. .

The receiving module 41 is configured to receive the handover indication information sent by the first UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path. ;

The obtaining module 42 is configured to obtain a second public network IP address and a second public network port number.

The obtaining module 42 is further configured to obtain the first private network IP address and the first private network port number;

The path establishing module 43 is configured to establish the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port;

The communication module 44 is configured to communicate with the first UE on the direct communication path.

In this embodiment, the path establishing module 43 is specifically configured to: establish the first public network IP address, the second public network port number, the second private network IP address, and the second private network port number. Corresponding relationship, and a second correspondence between the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number.

Optionally, the communication module 44 is specifically configured to: replace, according to the first correspondence, a source IP address of a data packet sent to the first UE with the second public network IP address, where the data is The source port number of the packet is replaced by the second public network port number, and the destination IP address of the data packet is replaced with the first private network IP address according to the second correspondence, and the data packet is The destination port number is replaced by the first private network port number, where the source port number of the data packet is the second private network port number, and the source port number of the data packet is the second private network a port number, the destination IP address of the data packet is the first public network IP address, the destination port number of the data packet is the first public network port number, and the second UE replaces the data packet Transmitting to the first UE by using the direct communication path; or receiving, by the direct communication path, a data packet sent by the first UE.

In an implementation manner, the receiving module 41 is specifically configured to: receive a third direct communication request message sent by the first UE, where the third direct communication request message includes: the handover indication information. The third direct communication request message further includes the second public network IP address and the second public network port number, and the obtaining module 42 is specifically configured to: obtain the location from the third direct communication request message The second public network IP address and the second public network port number are described. The third direct communication request message further includes the first private network IP address and the first private network port number, and the obtaining module 42 is specifically configured to: obtain the location from the third direct communication request message. The first private network IP address and the first private network port number are described.

In another implementation manner, the receiving module 41 is specifically configured to: receive a fourth direct communication request message sent by the first UE, where the fourth direct communication request message includes: the handover indication information. Obtaining the second public network IP address and the second public network port number, the obtaining module 42 includes: sending a fourth request message to the application server, where the fourth request message is used to request to acquire the second public And receiving the fourth response message returned by the application server, where the fourth response message includes the second public network IP address and the second public network port number . The acquiring module acquires the first private network IP address and the first private network port number, and the method includes: the fourth direct communication request message further includes the first private network IP address and the first private The network port number, the obtaining module 42 acquires the first private network IP address and the first private network port number from the fourth direct communication request message.

Optionally, the second UE further includes: a sending module, configured to return a third direct communication response message to the first UE, where the third direct communication response message includes a first public network IP address, and a first a public network port number, a second private network IP address, and a second private network port number, or returning a fourth direct communication response message to the first UE, where the fourth direct communication response message includes a second private network IP address. Address and second private network port number.

Optionally, in the third direct communication request message or the fourth direct communication request message The application identifier information is further used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path.

The second UE provided in this embodiment may be used to implement the solutions in the eighth embodiment and the ninth embodiment. The specific implementation manners and the technical effects are similar.

FIG. 14 is a schematic structural diagram of a first UE according to Embodiment 14 of the present invention. As shown in FIG. 14, the first UE 500 provided in this embodiment includes: a processor 51, a memory 52, a communication interface 53, and a system bus 54, The memory 51 and the communication interface 53 are connected and communicated with the processor 51 through the system bus; the memory 51 is configured to store computer execution instructions; the communication interface 53 is configured to communicate with other devices. a processor for executing the computer to execute instructions, performing the method as described below:

Transmitting, by the second UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path;

Obtaining a first public network IP address and a first public network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path The first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path;

Establishing the direct communication path by using the first public network IP address and the first public network port number;

Communicating with the second UE on the direct communication path.

Optionally, the processor 51 sends the handover indication information to the second UE, where the processor 51 sends a first request message to the second UE, where the first request message is used to request to obtain the The first public network IP address and the first public network port number, and the first request message includes the handover indication information. The processor 51 obtains the first public network IP address and the first public network port number, specifically: receiving the first response message returned by the second UE, where the first response message includes: the first public The network IP address and the first public network port number.

Optionally, the first request message further includes application identifier information, where the application identifier information is used to indicate that the second UE switches the communication path under the application corresponding to the application identifier from the network communication path. To the direct communication path.

Before the processor 51 establishes the direct communication path by using the first public network IP address and the first public network port number, the processor 51 is further configured to: receive the second a request message, the second request message is used to request the first UE to acquire a second public network IP address and a second public network port, and send a second response message to the second UE, where the second response is The message includes: the second public network IP address and port number and the second public network port number.

Optionally, the processor 51 obtains the first public network IP address and the first public network port number, where the processor 51 sends a first direct communication request message to the second UE, where the first The direct communication request message further includes: a second public network IP address and a second public network port number; receiving the first direct communication response message returned by the second UE, where the first direct communication response message includes: The first public network IP address and the first public network port number. Optionally, the handover indication information is carried in the first direct communication request message.

Optionally, the processor 51 sends the handover indication information to the second UE, where the second direct communication request message is sent to the second UE, where the second direct communication request message includes the handover indication information. . The processor 51 obtains the first public network IP address and the first public network port number, specifically: sending a third request message to the application server, where the third request message is used to request to obtain the first public network IP address. And receiving, by the first public network port number, a third response message that is returned by the application server, where the third response message includes: the first public network IP address and the first public network port number.

Optionally, the first direct communication request message or the second direct communication request message further includes application identification information, where the application identification information is used to indicate that the second UE uses the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path.

The processor 51 communicates with the second UE on the direct communication path, where the processor 51 uses the first public network IP address as a source of data packets sent to the second UE. The IP address, the first public network port number is used as the source port number of the data packet, the second public network IP address is used as the destination IP address of the data packet, and the second public network port number is used as the data. And a destination port number of the packet, where the data packet is sent to the second UE by using the direct communication path.

The first UE provided in this embodiment may be used to implement the solutions in the first embodiment and the third embodiment to the sixth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 15 is a schematic structural diagram of a second UE according to Embodiment 15 of the present invention. As shown in FIG. 15, the second UE 600 provided in this embodiment includes: a processor 61, a memory 62, a communication interface 63, and a system bus 64. The memory 62 and the communication interface 63 are connected and communicated with the processor 61 via the system bus 64; the memory 62 is for storing computer execution instructions; the communication interface 63 is for communicating with other devices for communication The processor 61 is configured to execute the computer to execute an instruction, and execute the method as follows:

Receiving, by the first UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path;

Obtaining a second public network IP address and a second public network port number;

Establishing the direct communication path by using the second public network IP address and the second public network port number;

Communicating with the first UE on the direct communication path.

Optionally, the processor 61 obtains the second public network IP address and the second public network port number, specifically: sending a second request message to the first UE, where the second request message is used to Receiving, by the first UE, the second public network IP address and the second public network port number; receiving a second response message that is returned by the first UE, where the second response message includes: the second public The network IP address and the second public network port number.

Optionally, before the acquiring, by the processor 61, the second public network IP address and the second public network port number, the processor 61 is further configured to: receive the first request message sent by the first UE, where the first request message includes And the first indication message is used to request to obtain the first public network IP address and the first public network port number; and determining, according to the handover indication information, that the first UE and the second UE are The first public network IP address and the first public network port number used in the network communication path; carrying the first public network IP address and the first public network port number in a first response message Transmitting to the first UE.

Optionally, the first request message further includes application identifier information, where the application identifier information is used to indicate that the second UE sends the communication path under the application corresponding to the application identifier from the network communication path. Switch to the direct communication path.

Optionally, the processor 61 obtains the second public network IP address and the second public network port number, specifically: receiving the first direct communication request message sent by the first UE, where the first direct communication The request message includes the second public network IP address and the second public network port number. Optionally, the handover indication information is carried in the first direct communication request message.

After receiving the first direct communication request message sent by the first UE, the processor 61 is further configured to: return a first direct communication response message to the first UE, where the first direct communication response message includes: The first public network IP address and the first public network port number.

Optionally, the processor 61 receives the handover indication information sent by the first UE, specifically: receiving a second direct communication request message sent by the first UE, where the second direct communication request message includes the handover Instructing the information that the second public network IP address and the second public network port number are obtained by the processor 61, specifically: sending a fourth request message to the application server, where the fourth request message is used to request to acquire the second public Receiving a fourth response message returned by the application server, where the fourth response message includes: the second public network IP address and the second public network port number.

Optionally, the first direct communication request message or the second direct communication request message further includes application identification information.

Optionally, the processor 61 communicates with the first UE on the direct communication path, specifically: using the second public network IP address as a source IP address of a data packet sent to the first UE. Address, the second public network port number is used as the source port number of the data packet, the first public network IP address is used as the destination IP address of the data packet, and the first public network port number is used as the data packet. The destination port number, the data packet is sent to the first UE by using the direct communication path.

The second UE provided in this embodiment may be used to perform the solution provided in the second embodiment to the sixth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 16 is a schematic structural diagram of a first UE according to Embodiment 16 of the present invention. As shown in FIG. 16, the first UE 700 provided in this embodiment includes: a processor 71, a memory 72, a communication interface 73, and a system bus 74. The memory 72 and the communication interface 73 are connected and communicated with the processor 71 via the system bus 74; the memory 72 is configured to store computer execution instructions; the communication interface 73 is configured to communicate with other devices, The processor 71 is configured to run the computer to execute an instruction, and execute the method as follows:

Transmitting, by the second UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path;

Obtaining the first public network IP address and the first public network port number;

Obtaining a second private network IP address and a second private network port number;

Establishing the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number;

Communicating with the second UE on the direct communication path.

The processor 71 establishes the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number, specifically The processor 71 establishes a first correspondence between the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number, and the second public network IP address. The second correspondence between the address, the second public network port number, the second private network IP address, and the second private network port number.

The processor 71 communicates with the second UE on the direct communication path, specifically: the source IP address of the data packet that the processor 71 sends to the second UE according to the first correspondence. And replacing with the first public network IP address, replacing the source port number of the data packet with the first public network port number, and replacing the destination IP address of the data packet with the second corresponding relationship. The second private network IP address, the destination port number of the data packet is replaced with the second private network port number, where the source port number of the data packet is the first private network port number, The source port number of the data packet is the first private network port number, the destination IP address of the data packet is the second public network IP address, and the destination port number of the data packet is the second public network port The first UE sends the data packet to the second UE by using the direct communication path; or the first UE receives the data packet sent by the second UE by using the direct communication path.

Optionally, the processor 71 sends the handover indication information to the second UE, where the third direct communication request message is sent to the second UE, where the third direct communication request message includes: the handover indication information. The processor 71 obtains the first public network IP address and the first public network port number, specifically: receiving the third direct communication response message returned by the second UE, where the third direct communication response message includes: The first public network IP address and the first public network port number are described. The third direct communication response message further includes: the second private network IP address and the second private network port number, and the processor 71 acquires the second private network IP address and the second private network port number. Specifically, the second private network IP address is obtained from the third direct communication response message. And the second private network port number.

Optionally, the processor 71 sends the handover indication information to the second UE, where the fourth direct communication request message is sent to the second UE, where the fourth direct communication request message includes: the handover indication information. The processor 71 obtains the first public network IP address and the first public network port number, specifically: sending a third request message to the application server, where the third request message is used to request to acquire the first public network. An IP address and the first public network port number; receiving a third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number . The processor 71 obtains the second private network IP address and the second private network port number, specifically: receiving the fourth direct communication response message returned by the second UE, where the fourth direct communication response message includes: The second private network IP address and the second private network port number are described.

Optionally, the third direct communication request message further includes: a first private network IP address and a first private network port number, a second public network IP address, and a second public network port number.

Optionally, the fourth direct communication request message further includes: a first private network IP address and a first private network port number.

Optionally, the third direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate that the second UE uses the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path.

The first UE provided in this embodiment may be used to perform the solution provided in the seventh embodiment and the eighth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

FIG. 17 is a schematic structural diagram of a second UE according to Embodiment 17 of the present invention. As shown in FIG. 17, the second UE 800 provided in this embodiment includes: a processor 81, a memory 82, a communication interface 83, and a system bus 84. The memory 82 and the communication interface 83 are connected and communicated with the processor 81 through the system bus 84; the memory 82 is configured to store computer execution instructions; the communication interface 83 is used for performing with other devices. Communication, the processor 81, configured to run the computer to execute an instruction, and execute the method described below:

Receiving, by the first UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path;

Obtaining a second public network IP address and a second public network port number;

Obtaining the first private network IP address and the first private network port number;

Establishing the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port;

Communicating with the first UE on the direct communication path.

Optionally, the processor 81 establishes the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port. Specifically, the processor 81 establishes a first correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number, and the first The second corresponding relationship between the public network IP address, the first public network port number, the first private network IP address, and the first private network port number.

Optionally, the processor 81 is configured to communicate with the first UE on the direct communication path, where the source IP address of the data packet sent to the first UE is replaced according to the first correspondence. And replacing, by the second public network IP address, the source port number of the data packet with the second public network port number, and replacing the destination IP address of the data packet with the second correspondence relationship. The first private network IP address, the destination port number of the data packet is replaced with the first private network port number; or the data packet sent by the first UE is received through the direct communication path.

Optionally, the processor 81 receives the handover indication information that is sent by the first UE, specifically: receiving a third direct communication request message sent by the first UE, where the third direct communication request message includes: Switch the indication information. The processor 81 obtains the second public network IP address and the second public network port number, where the third direct communication request message further includes the second public network IP address and the second public network port. The processor 81 obtains the second public network IP address and the second public network port number from the third direct communication request message. The third direct communication request message further includes the first private network IP address and the first private network port number, and the processor 81 obtains the first private network IP address and the first private network port number, specifically The processor 81 obtains the first private network IP address and the first private network port number from the third direct communication request message.

Optionally, the processor 81 receives the handover indication information that is sent by the first UE, specifically: receiving a fourth direct communication request message sent by the first UE, where the fourth direct communication request message includes: Switch the indication information. The processor 81 acquires a second public network IP address and The second public network port number is specifically configured to: send a fourth request message to the application server, where the fourth request message is used to request to obtain the second public network IP address and the second public network port number; The fourth response message returned by the application server, where the fourth response message includes the second public network IP address and the second public network port number. The processor 81 obtains the first private network IP address and the first private network port number, where the fourth direct communication request message further includes the first private network IP address and the first private network port. The processor 81 obtains the first private network IP address and the first private network port number from the fourth direct communication request message.

After receiving the third direct communication request message sent by the first UE, the processor 81 is further configured to: return a third direct communication response message, the third direct communication response message, to the first UE. The first public network IP address, the first public network port number, the second private network IP address, and the second private network port number are included.

After receiving the fourth direct communication request message sent by the first UE, the processor 81 is further configured to: return, to the first UE, a fourth direct communication response message, where the fourth direct communication response The message includes a second private network IP address and a second private network port number.

Optionally, the third direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate that the second UE uses the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path.

The second UE provided in this embodiment may be used to implement the solution provided in the eighth embodiment and the ninth embodiment. The specific implementation manners and technical effects are similar, and details are not described herein again.

A person skilled in the art can understand that all or part of the steps of implementing the above method embodiments may be completed by using hardware related to the program instructions. The foregoing program may be stored in a computer readable storage medium, and the program is executed when executed. The foregoing steps include the steps of the foregoing method embodiments; and the foregoing storage medium includes: a medium that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, and are not intended to be limiting; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that The technical solutions described in the foregoing embodiments may be modified, or some or all of the technical features may be equivalently replaced; and the modifications or substitutions do not deviate from the technical solutions of the embodiments of the present invention. range.

Claims (74)

A method for switching between network communication and direct communication, comprising: The first user equipment UE sends the handover indication information to the second UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path; The first UE acquires a first public network Internet Protocol IP address and a first public network port number, where the first public network IP address is that the first UE communicates with the second UE in the network communication path. a public network IP address used, the first public network port number being a public network port number used by the first UE to communicate with the second UE in the network communication path; The first UE establishes the direct communication path by using the first public network IP address and the first public network port number; The first UE communicates with the second UE on the direct communication path. The method according to claim 1, wherein the sending, by the first UE, the handover indication information to the second UE comprises: Sending, by the first UE, a first request message to the second UE, where the first request message is used to request to acquire the first public network IP address and the first public network port number, the first request The message includes the handover indication information; Obtaining, by the first UE, the first public network IP address and the first public network port number, including: The first UE receives the first response message returned by the second UE, where the first response message includes: the first public network IP address and the first public network port number. The method according to claim 2, wherein the first request message further includes application identification information, where the application identification information is used to indicate that the second UE is to use the application corresponding to the application identifier. A communication path is switched from the network communication path to the direct communication path. The method according to claim 2 or 3, wherein before the first UE establishes the direct communication path by using the first public network IP address and the first public network port number, the method further include: Receiving, by the first UE, a second request message sent by the second UE, where the second request message is used to request the first UE to acquire a second public network IP address and a second public network port, where the The second public network IP address is the second UE communicating with the first UE in the network communication path. a public network IP address used by the communication, the second public network port number being a public network port number used by the second UE to communicate with the first UE in the network communication path; The first UE sends a second response message to the second UE, where the second response message includes: the second public network IP address and port number and the second public network port number. The method according to claim 1, wherein the first UE acquires the first public network IP address and the first public network port number, including: The first UE sends a first direct communication request message to the second UE, where the first direct communication request message further includes: a second public network IP address and a second public network port number, the second public The network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE in the network communication a public network port number used in communication with the first UE in the path; The first UE receives the first direct communication response message returned by the second UE, where the first direct communication response message includes: the first public network IP address and the first public network port number. The method according to claim 5, wherein the handover indication information is carried in the first direct communication request message. The method according to claim 1, wherein the sending, by the first UE, the handover indication information to the second UE comprises: The first UE sends a second direct communication request message to the second UE, where the second direct communication request message includes the handover indication information; Obtaining, by the first UE, the first public network IP address and the first public network port number, including: The first UE sends a third request message to the application server, where the third request message is used to request to acquire the first public network IP address and the first public network port number; The first UE receives the third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number. The method according to any one of claims 5-7, wherein the first direct communication request message or the second direct communication request message further includes application identification information, where the application identification information is used Instructing the second UE to switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. The method of claim 1 wherein said first UE is in said straight Communicating with the second UE on the communication path, including: The first UE uses the first public network IP address as a source IP address of a data packet sent to the second UE, and uses the first public network port number as a source port number of the data packet, and The second public network IP address is used as the destination IP address of the data packet, and the second public network port number is used as the destination port number of the data packet, and the data packet is sent to the second through the direct communication path. a UE, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is And a public network port number used by the second UE to communicate with the first UE in the network communication path. A method for switching between network communication and direct communication, comprising: The second user equipment UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the communication path between the second UE and the first UE is switched from the network communication path to the direct communication path; Obtaining, by the second UE, a second public network internet protocol IP address and a second public network port number, where the second public network IP address is that the second UE communicates with the first UE in the network communication path a public network IP address used, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path; The second UE establishes the direct communication path by using the second public network IP address and the second public network port number; The second UE communicates with the first UE on the direct communication path. The method according to claim 10, wherein the acquiring, by the second UE, the second public network IP address and the second public network port number comprises: The second UE sends a second request message to the first UE, where the second request message is used to request the first UE to acquire the second public network IP address and the second public network port number. ; The second UE receives the second response message that is returned by the first UE, where the second response message includes: the second public network IP address and the second public network port number. The method according to claim 11, wherein before the acquiring, by the second UE, the second public network IP address and the second public network port number, the method further includes: Receiving, by the second UE, the first request message sent by the first UE, the first request The message includes the handover indication information, where the first request message is used to request to acquire a first public network IP address and a first public network port number, where the first public network IP address is the first UE in the a public network IP address used for communicating with the second UE in the network communication path, where the first public network port number is used by the first UE to communicate with the second UE in the network communication path Public network port number; Determining, by the second UE, the first public network IP address and the first public network port number used by the first UE and the second UE in the network communication path according to the handover indication information ; The second UE sends the first public network IP address and the first public network port number in the first response message to the first UE. The method according to claim 12, wherein the first request message further includes application identification information, where the application identification information is used to indicate that the second UE is to use the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path. The method according to claim 10, wherein the acquiring, by the second UE, the second public network IP address and the second public network port number comprises: The second UE receives the first direct communication request message sent by the first UE, where the first direct communication request message includes the second public network IP address and the second public network port number. The method of claim 14, wherein the handover indication information is carried in the first direct communication request message. The method according to claim 14 or 15, wherein after the second UE receives the first direct communication request message sent by the first UE, the method further includes: Returning, by the second UE, the first direct communication response message to the first UE, where the first direct communication response message includes: a first public network IP address and a first public network port number, the first public network The IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first UE in the network communication path. A public network port number used for communicating with the second UE. The method according to claim 10, wherein the receiving, by the second UE, the handover indication information sent by the first UE comprises: Receiving, by the second UE, a second direct communication request message sent by the first UE, where The second direct communication request message includes the handover indication information; Obtaining, by the second UE, the second public network IP address and the second public network port number, including: The second UE sends a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number; The second UE receives the fourth response message returned by the application server, where the fourth response message includes: the second public network IP address and the second public network port number. The method according to any one of claims 14-17, wherein the first direct communication request message or the second direct communication request message further includes application identification information, where the application identification information is used Instructing the second UE to switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. The method according to claim 10, wherein the second UE communicates with the first UE on the direct communication path, including: The second UE uses the second public network IP address as the source IP address of the data packet sent to the first UE, and the second public network port number as the source port number of the data packet, The first public network IP address is used as the destination IP address of the data packet, and the first public network port number is used as the destination port number of the data packet, and the data packet is sent to the first through the direct communication path. a UE, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path. A method for switching between network communication and direct communication, comprising: The first user equipment UE sends the handover indication information to the second UE, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from the network communication path to the direct communication path; The first UE acquires a first public network Internet Protocol IP address and a first public network port number, where the first public network IP address is that the first UE communicates with the second UE in the network communication path. a public network IP address used, the first public network port number being a public network port number used by the first UE to communicate with the second UE in the network communication path; The first UE acquires a second private network IP address and a second private network port number, where the second private network IP address is used by the second UE to communicate with the first UE in the network communication path. a private network IP address, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path; The first UE establishes the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number; The first UE communicates with the second UE on the direct communication path. The method according to claim 20, wherein the first UE uses the first public network IP address, the first public network port number, the second private network IP address, and the second The private network port number establishes the direct communication path, including: The first UE establishes a first correspondence between the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number, and the second public network IP address. And a second corresponding relationship between the second public network port number and the second private network IP address and the second private network port number, where the first private network IP address is the first UE in the a private network IP address used in communication with the second UE in the network communication path, where the first private network port number is used by the first UE to communicate with the second UE in the network communication path a private network port number, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path. The method according to claim 21, wherein the first UE communicates with the second UE on the direct communication path, including: The first UE replaces the source IP address of the data packet sent to the second UE with the first public network IP address according to the first correspondence, and replaces the source port number of the data packet with the The first public network port number, the destination IP address of the data packet is replaced with the second private network IP address according to the second correspondence, and the destination port number of the data packet is replaced by the second a private network port number, where the source port number of the data packet is the first private network port number, the source port number of the data packet is the first private network port number, and the destination IP address of the data packet The address is the second public network IP address, the destination port number of the data packet is the second public network port number, and the first UE sends the data packet to the first Two UE; Or the first UE receives the data packet sent by the second UE by using the direct communication path. The method according to claim 20, wherein the sending, by the first UE, the handover indication information to the second UE comprises: The first UE sends a third direct communication request message to the second UE, where the third direct communication request message includes: the handover indication information; Obtaining, by the first UE, the first public network IP address and the first public network port number, including: Receiving, by the first UE, the third direct communication response message that is returned by the second UE, where the third direct communication response message includes: the first public network IP address and the first public network port number; The first UE acquires the second private network IP address and the second private network port number, including: The third direct communication response message further includes: the second private network IP address and the second private network port number, where the first UE acquires the second from the third direct communication response message The private network IP address and the second private network port number. The method according to claim 20, wherein the sending, by the first UE, the handover indication information to the second UE comprises: The first UE sends a fourth direct communication request message to the second UE, where the fourth direct communication request message includes: the handover indication information; Obtaining, by the first UE, the first public network IP address and the first public network port number, including: The first UE sends a third request message to the application server, where the third request message is used to request to acquire the first public network IP address and the first public network port number; The first UE receives the third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number; The first UE acquires the second private network IP address and the second private network port number, including: The first UE receives the fourth direct communication response message returned by the second UE, where the fourth direct communication response message includes: the second private network IP address and the second private network port number. The method according to claim 23, wherein the third direct communication request message further comprises: a first private network IP address and a first private network port number, a second public network IP address, and a second public network. a port number, where the first private network IP address is a private network IP address used by the first UE to communicate with the second UE in the network communication path, where the first private network port number is a private network used by the first UE to communicate with the second UE in the network communication path a port number, where the second public network IP address is the public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the a public network port number used by the first UE to communicate with the first UE in the network communication path. The method according to claim 24, wherein the fourth direct communication request message further includes: a first private network IP address and a first private network port number, wherein the first private network IP address is the first a private network IP address used by the UE to communicate with the second UE in the network communication path, where the first private network port number is the first UE in the network communication path and the second The private network port number used by the UE for communication. The method according to claim 25 or 26, wherein the third direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate the The two UEs switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. A method for switching between network communication and direct communication, comprising: The second user equipment UE receives the handover indication information sent by the first UE, where the handover indication information is used to indicate that the communication path between the second UE and the first UE is switched from the network communication path to the direct communication path; Obtaining, by the second UE, a second public network internet protocol IP address and a second public network port number, where the second public network IP address is that the second UE communicates with the first UE in the network communication path a public network IP address used, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path; The second UE acquires a first private network IP address and a first private network port number, where the first private network IP address is used by the first UE to communicate with the second UE in the network communication path. a private network IP address, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path; The second UE establishes the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port; The second UE communicates with the first UE on the direct communication path. The method according to claim 28, wherein the second UE uses the second public network IP address, the second public network port number, the first private network IP address, and the first The private network port establishes the direct communication path, including: The second UE establishes a first correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number, and the first public network IP address. a second corresponding relationship between the first public network port number and the first private network IP address and the first private network port number, where the second private network IP address is the second UE in the a private network IP address used in communication with the first UE in a network communication path, where the second private network port number is used by the second UE to communicate with the first UE in the network communication path a private network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path. The method according to claim 29, wherein the second UE communicates with the first UE on the direct communication path, including: The second UE replaces the source IP address of the data packet sent to the first UE with the second public network IP address according to the first correspondence, and replaces the source port number of the data packet with the a second public network port number, the destination IP address of the data packet is replaced with the first private network IP address according to the second correspondence, and the destination port number of the data packet is replaced by the first a private network port number, where the source port number of the data packet is the second private network port number, the source port number of the data packet is the second private network port number, and the destination IP address of the data packet The address is the first public network IP address, the destination port number of the data packet is the first public network port number, and the second UE sends the replaced data packet to the First UE; Or the second UE receives the data packet sent by the first UE by using the direct communication path. The method according to claim 29, wherein the receiving, by the second UE, the handover indication information sent by the first UE comprises: The second UE receives the third direct communication request message sent by the first UE, where the third direct communication request message includes: the handover indication information; Obtaining, by the second UE, the second public network IP address and the second public network port number, including: The second direct communication request message further includes the second public network IP address and the second public network port number, and the second UE acquires the second public from the third direct communication request message a network IP address and the second public network port number; Obtaining, by the second UE, the first private network IP address and the first private network port number, including: The third direct communication request message further includes the first private network IP address and the first private network port number, and the second UE acquires the first private information from the third direct communication request message. The network IP address and the first private network port number. The method according to claim 29, wherein the receiving, by the second UE, the handover indication information sent by the first UE comprises: The second UE receives the fourth direct communication request message sent by the first UE, where the fourth direct communication request message includes: the handover indication information; Obtaining, by the second UE, the second public network IP address and the second public network port number, including: The second UE sends a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number; The second UE receives the fourth response message returned by the application server, where the fourth response message includes the second public network IP address and the second public network port number; Obtaining, by the second UE, the first private network IP address and the first private network port number, including: The fourth direct communication request message further includes the first private network IP address and the first private network port number, and the second UE acquires the first private information from the fourth direct communication request message. The network IP address and the first private network port number. The method according to claim 31, wherein after the second UE receives the third direct communication request message sent by the first UE, the method further includes: Returning, by the second UE, a third direct communication response message to the first UE, where the third direct communication response message includes a first public network IP address, a first public network port number, a second private network IP address, and a second private network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port The number is a public network port number used by the first UE to communicate with the second UE in the network communication path, and the second private network IP address is the second UE in the network communication path. a private network IP address used for communicating with the first UE, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path . The method according to claim 32, wherein after the second UE receives the fourth direct communication request message sent by the first UE, the method further includes: Returning, by the second UE, a fourth direct communication response message to the first UE, where the fourth The direct communication response message includes a second private network IP address and a second private network port number, where the second private network IP address is used by the second UE to communicate with the first UE in the network communication path. The private network IP address, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path. The method according to claim 31 or 32, wherein the third direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate the The two UEs switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. A first user equipment (UE), comprising: a sending module, configured to send, to the second UE, the handover indication information, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path; An acquiring module, configured to obtain a first public network internet protocol IP address and a first public network port number, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path a public network IP address used, the first public network port number being a public network port number used by the first UE to communicate with the second UE in the network communication path; a path establishing module, configured to establish the direct communication path by using the first public network IP address and the first public network port number; And a communication module, configured to communicate with the second UE on the direct communication path. The first UE according to claim 36, wherein the sending module is specifically configured to: Sending a first request message to the second UE, where the first request message is used to request to obtain the first public network IP address and the first public network port number, where the first request message includes the Switching indication information; The obtaining module is specifically configured to: And receiving, by the second UE, the first response message, where the first response message includes: the first public network IP address and the first public network port number. The first UE according to claim 37, wherein the first request message further includes application identification information, where the application identification information is used to indicate that the second UE is to use the application corresponding to the application identifier. Switching the communication path from the network communication path to the Direct communication path. The first UE according to claim 37 or 38, wherein the first UE further comprises: a receiving module, configured to receive a second request message sent by the second UE, where the second request message is used to request, by the first UE, to acquire a second public network IP address and a second public network port, where The second public network IP address is the public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE in the a public network port number used by the network communication path to communicate with the first UE; The sending module is further configured to send a second response message to the second UE, where the second response message includes: the second public network IP address and port number and the second public network port number. The first UE according to claim 36, wherein the obtaining module is specifically configured to: Sending a first direct communication request message to the second UE, where the first direct communication request message further includes: a second public network IP address and a second public network port number, where the second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, where the second public network port number is the second UE in the network communication path and the a public network port number used by the first UE communication; And receiving, by the second UE, the first direct communication response message, where the first direct communication response message includes: the first public network IP address and the first public network port number. The first UE according to claim 40, wherein the handover indication information is carried in the first direct communication request message. The first UE according to claim 36, wherein the sending module is specifically configured to: Sending, to the second UE, a second direct communication request message, where the second direct communication request message includes the handover indication information; The obtaining module is specifically configured to: Sending a third request message to the application server, where the third request message is used to request to obtain the first public network IP address and the first public network port number; Receiving a third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number. The first UE according to any one of claims 40-42, wherein the first direct communication request message or the second direct communication request message further includes application identification information, the application identification information And configured to instruct the second UE to switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. The first UE according to claim 36, wherein the communication module is specifically configured to: Using the first public network IP address as the source IP address of the data packet sent to the second UE, using the first public network port number as the source port number of the data packet, and using the second public network IP address The address is used as the destination IP address of the data packet, and the second public network port number is used as the destination port number of the data packet, and the data packet is sent to the second UE by using the direct communication path, where The second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE a public network port number used by the network communication path to communicate with the first UE. A second user equipment UE, comprising: a receiving module, configured to receive, by the first UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path; An acquiring module, configured to obtain a second public network internet protocol IP address and a second public network port number, where the second public network IP address is used by the second UE to communicate with the first UE in the network communication path a public network IP address used, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path; a path establishing module, configured to establish the direct communication path by using the second public network IP address and the second public network port number; And a communication module, configured to communicate with the first UE on the direct communication path. The second UE according to claim 45, wherein the obtaining module is specifically configured to: Sending a second request message to the first UE, where the second request message is used to request the first UE to acquire the second public network IP address and the second public network port number; And receiving, by the first UE, a second response message, where the second response message includes: the second public network IP address and the second public network port number. The second UE according to claim 46, wherein the receiving module is further configured to: And receiving, by the first UE, the first request message, where the first request message includes the handover indication information, where the first request message is used to request to acquire a first public network IP address and a first public network port number. The first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first a public network port number used by the UE to communicate with the second UE in the network communication path; Determining, according to the handover indication information, the first public network IP address and the first public network port number used by the first UE and the second UE in the network communication path; The second UE further includes: a sending module, configured to send the first public network IP address and the first public network port number to the first UE in a first response message. The second UE according to claim 47, wherein the first request message further includes application identification information, where the application identification information is used to indicate that the second UE uses the application corresponding to the application identifier. The communication path is switched from the network communication path to the direct communication path. The second UE according to claim 45, wherein the obtaining module is specifically configured to: Receiving, by the first UE, a first direct communication request message, where the first direct communication request message includes the second public network IP address and the second public network port number. The second UE according to claim 49, wherein the handover indication information is carried in the first direct communication request message. The second UE according to claim 49 or 50, wherein the second UE further comprises: a sending module, configured to return a first direct communication response message to the first UE, where the first direct communication response message includes: a first public network IP address and a first public network port number, the first public network The IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port number is the first UE in the network communication path. A public network port number used for communicating with the second UE. The second UE according to claim 45, wherein the receiving module is specifically configured to: Receiving, by the first UE, a second direct communication request message, where the second direct communication request message includes the handover indication information; The obtaining module is specifically configured to: Sending a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number; Receiving a fourth response message returned by the application server, where the fourth response message includes: the second public network IP address and the second public network port number. The second UE according to any one of claims 49-52, wherein the first direct communication request message or the second direct communication request message further includes application identification information, the application identification information And configured to instruct the second UE to switch the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. The second UE according to claim 45, wherein the second UE communicates with the first UE on the direct communication path, and the communication module is specifically configured to: The second public network IP address is used as a source IP address of the data packet sent to the first UE, and the second public network port number is used as a source port number of the data packet, and the first public network IP is used. The address is used as the destination IP address of the data packet, and the first public network port number is used as the destination port number of the data packet, and the data packet is sent to the first UE by using the direct communication path, where The first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, where the first public network port number is the first UE A public network port number used by the network communication path to communicate with the second UE. A first user equipment (UE), comprising: a sending module, configured to send, to the second UE, the handover indication information, where the handover indication information is used to indicate that the second UE switches the communication path with the first UE from a network communication path to a direct communication path; An acquiring module, configured to obtain a first public network internet protocol IP address and a first public network port number, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path a public network IP address used, the first public network port number being a public network port number used by the first UE to communicate with the second UE in the network communication path; The acquiring module is further configured to obtain a second private network IP address and a second private network port number, where the second private network IP address is the second UE in the network communication path and the first UE a private network IP address used by the communication, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path; a path establishing module, configured to establish the direct communication path by using the first public network IP address, the first public network port number, the second private network IP address, and the second private network port number; And a communication module, configured to communicate with the second UE on the direct communication path. The first UE according to claim 55, wherein the path establishment module is specifically configured to: Establishing a first correspondence between the first public network IP address, the first public network port number, the first private network IP address, and the first private network port number, and the second public network IP address and the second public network a second corresponding relationship between the port number and the second private network IP address and the second private network port number, wherein the first private network IP address is the first UE in the network communication path a private network IP address used by the second UE to communicate, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path, The second public network IP address is a public network IP address used by the second UE to communicate with the first UE in the network communication path, and the second public network port number is the second UE A public network port number used to communicate with the first UE in the network communication path. The first UE according to claim 56, wherein the communication module is specifically configured to: Substituting the source IP address of the data packet sent to the second UE with the first public network IP address according to the first correspondence, and replacing the source port number of the data packet with the first public network And replacing, by the second correspondence, the destination IP address of the data packet with the second private network IP address, and replacing the destination port number of the data packet with the second private network port number. The source port number of the data packet is the first private network port number, the source port number of the data packet is the first private network port number, and the destination IP address of the data packet is the first The second public network IP address, the destination port number of the data packet is the second public network port number, the first UE sends the data packet to the second UE by using the direct communication path; Or receiving, by the direct communication path, a data packet sent by the second UE. The first UE according to claim 55, wherein the sending module is specifically configured to: Sending, by the first UE, a third direct communication request message to the second UE, where the third The direct communication request message includes: the handover indication information; The obtaining module is specifically configured to: And receiving, by the second UE, a third direct communication response message, where the third direct communication response message includes: the first public network IP address and the first public network port number; The third direct communication response message further includes: the second private network IP address and the second private network port number, obtaining the second private network IP address from the third direct communication response message, and The second private network port number. The first UE according to claim 55, wherein the sending module is specifically configured to: Sending a fourth direct communication request message to the second UE, where the fourth direct communication request message includes: the handover indication information; The acquiring module acquires the first public network IP address and the first public network port number, including: Sending a third request message to the application server, where the third request message is used to request to obtain the first public network IP address and the first public network port number; Receiving a third response message returned by the application server, where the third response message includes: the first public network IP address and the first public network port number; The acquiring module acquires the second private network IP address and the second private network port number, including: And receiving, by the second UE, a fourth direct communication response message, where the fourth direct communication response message includes: the second private network IP address and the second private network port number. The first UE according to claim 59, wherein the third direct communication request message further includes: a first private network IP address and a first private network port number, a second public network IP address, and a second a public network port number, where the first private network IP address is a private network IP address used by the first UE to communicate with the second UE in the network communication path, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path, where the second public network IP address is the second UE in the network communication path The public network IP address used by the first UE communication and the second public network port number are public network port numbers used by the second UE to communicate with the first UE in the network communication path. The first UE according to claim 59, wherein the fourth direct communication request The request message further includes: a first private network IP address and a first private network port number, where the first private network IP address is used by the first UE to communicate with the second UE in the network communication path. The private network IP address, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path. The first UE according to claim 60 or claim 61, wherein the third direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate The second UE switches the communication path under the application corresponding to the application identifier from the network communication path to the direct communication path. A second user equipment UE, comprising: a receiving module, configured to receive, by the first UE, handover indication information, where the handover indication information is used to indicate that the second UE switches a communication path with the first UE from a network communication path to a direct communication path; An acquiring module, configured to obtain a second public network internet protocol IP address and a second public network port number, where the second public network IP address is used by the second UE to communicate with the first UE in the network communication path a public network IP address used, where the second public network port number is a public network port number used by the second UE to communicate with the first UE in the network communication path; The acquiring module is further configured to obtain a first private network IP address and a first private network port number, where the first private network IP address is the first UE in the network communication path and the second UE a private network IP address used by the communication, where the first private network port number is a private network port number used by the first UE to communicate with the second UE in the network communication path; a path establishing module, configured to establish the direct communication path by using the second public network IP address, the second public network port number, the first private network IP address, and the first private network port; And a communication module, configured to communicate with the first UE on the direct communication path. The second UE according to claim 63, wherein the path establishment module is specifically configured to: Establishing a first correspondence between the second public network IP address, the second public network port number, the second private network IP address, and the second private network port number, and the first public network IP address and the first public network a second corresponding relationship between the port number and the first private network IP address and the first private network port number, where the second private network IP address is the second UE in the network communication path The private network IP address used by the first UE to communicate, and the second private network port number is the second UE in the a private network port number used by the network communication path to communicate with the first UE, where the first public network IP address is used by the first UE to communicate with the second UE in the network communication path. The public network IP address, where the first public network port number is a public network port number used by the first UE to communicate with the second UE in the network communication path. The second UE according to claim 64, wherein the communication module is specifically configured to: Substituting the source IP address of the data packet sent to the first UE with the second public network IP address according to the first correspondence, and replacing the source port number of the data packet with the second public network And replacing, by the second correspondence, the destination IP address of the data packet with the first private network IP address, and replacing the destination port number of the data packet with the first private network port number, The source port number of the data packet is the second private network port number, the source port number of the data packet is the second private network port number, and the destination IP address of the data packet is the first a public network IP address, the destination port number of the data packet is the first public network port number, and the second UE sends the replaced data packet to the first UE by using the direct communication path; Or receiving, by the direct communication path, a data packet sent by the first UE. The second UE according to claim 64, wherein the receiving module is specifically configured to: And receiving, by the first UE, a third direct communication request message, where the third direct communication request message includes: the handover indication information; The obtaining module is specifically configured to: The third direct communication request message further includes the second public network IP address and the second public network port number, and the second public network IP address and the location are obtained from the third direct communication request message. Said second public network port number; The third direct communication request message further includes the first private network IP address and the first private network port number, and the first private network IP address and the location are obtained from the third direct communication request message. The first private network port number. The second UE according to claim 64, wherein the receiving module is specifically configured to: And receiving, by the first UE, a fourth direct communication request message, where the fourth direct communication request message includes: the handover indication information; The obtaining module acquires the second public network IP address and the second public network port number, including: Sending a fourth request message to the application server, where the fourth request message is used to request to acquire the second public network IP address and the second public network port number; Receiving a fourth response message returned by the application server, where the fourth response message includes the second public network IP address and the second public network port number; The acquiring module acquires the first private network IP address and the first private network port number, including: The fourth direct communication request message further includes the first private network IP address and the first private network port number, and the obtaining module acquires the first private network from the fourth direct communication request message. The IP address and the first private network port number. The second UE according to claim 66, wherein the second UE further comprises: a sending module, configured to return a third direct communication response message to the first UE, where the third direct communication response message includes a first public network IP address, a first public network port number, and a second private network IP address, and a second private network port number, where the first public network IP address is a public network IP address used by the first UE to communicate with the second UE in the network communication path, and the first public network port The number is a public network port number used by the first UE to communicate with the second UE in the network communication path, and the second private network IP address is the second UE in the network communication path. a private network IP address used for communicating with the first UE, where the second private network port number is a private network port number used by the second UE to communicate with the first UE in the network communication path . The second UE according to claim 67, wherein the second UE further comprises: a sending module, configured to return a fourth direct communication response message to the first UE, where the fourth direct communication response message includes a second private network IP address and a second private network port number, and the second private network IP address The address is a private network IP address used by the second UE to communicate with the first UE in the network communication path, and the second private network port number is the second UE in the network communication path. The private network port number used to communicate with the first UE. A second UE according to claim 68 or 69, wherein said third The direct communication request message or the fourth direct communication request message further includes application identification information, where the application identification information is used to indicate that the second UE sends the communication path under the application corresponding to the application identifier from the The network communication path switches to the direct communication path. A first user equipment UE, comprising: a processor, a memory, a communication interface, and a system bus, wherein the memory and the communication interface are connected to and communicate with the processor through the system bus; The memory is configured to store a computer execution instruction; The processor is configured to execute the computer to execute an instruction to perform the method of any one of claims 1-9. A second user equipment UE, comprising: a processor, a memory, a communication interface, and a system bus, wherein the memory and the communication interface are connected to and communicate with the processor through the system bus; The memory is configured to store a computer execution instruction; The processor is configured to execute the computer to execute an instruction to perform the method of any one of claims 10-19. A first user equipment UE, comprising: a processor, a memory, a communication interface, and a system bus, wherein the memory and the communication interface are connected to and communicate with the processor through the system bus; The memory is configured to store a computer execution instruction; The processor is configured to execute the computer to execute an instruction to perform the method of any one of claims 20-27. A second user equipment UE, comprising: a processor, a memory, a communication interface, and a system bus, wherein the memory and the communication interface are connected to and communicate with the processor through the system bus; The memory is configured to store a computer execution instruction; The processor is configured to execute the computer to execute an instruction to perform the method of any one of claims 28-35.

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