WO2018040232A1 - Switching method and device - Google Patents

Abstract

A switching method and device comprise: a first core network device receiving a first switching request from a second core network device, the first switching request carrying a first IP address and an address of a third core network device (202), the first IP address and the address of the third core network device being used for an establishment process of a first APN, the first core network device being applied to a first-standard network, the second core network device and the third core network device being applied to a second-standard network, and the first IP address being an IP address allocated by the second-standard network to a terminal; the first core network device initiating an establishment process of the first APN for the terminal in the first-standard network (203); the first core network device sending a second switching request to an access network device (204), the access network device being applied to the first-standard network; the first core network device receives a response message for the second switching request from the access network device (205); and the first core network device sending a response message for the first switching request to the second core network device (206).

Description

Switching method and device

The present invention claims priority to the priority of the application Serial No. PCT/CN2016/097247, filed on Aug. 29, 2016, which is incorporated herein by reference. This.

Technical field

The present invention relates to the field of communications technologies, and in particular, to a handover method and device.

Background technique

4th Generation (4G) mobile communication networks, such as Long Term Evolution (LTE) networks, have now achieved wide coverage. 4G network has won the praise of users and operators because of its fast communication speed, wide network spectrum and flexible communication. However, with the emergence of network requirements such as the Internet of Things and the Internet of Vehicles, users are increasingly demanding the next generation mobile communication network, that is, the 5th Generation (5G) mobile communication network, for example, requiring continuous wide-area coverage of 100 megabytes. User experience rate per second (Mbps), user experience rate of 1 gigabyte per second (Gbps), air interface delay within 1 millisecond (ms), end-to-end delay within 100ms, reliability Guarantee and so on.

In the early stage of commercialization of 4G networks, in practice, it is necessary to ensure interoperability between 4G networks and 2nd Generation (2G) mobile communication networks or 3rd Generation (3G) mobile communication networks to ensure continuity of services. Interoperability between 4G networks and 2G networks or 3G networks involves many complex processes, such as mapping of bearer/tunnel models, mapping of quality of service (QoS) parameters, mapping of security parameters, default bearers, and allowable There is no default bearer handover, and so on.

Similarly, in the initial stage of 5G network deployment, interoperability between 5G networks and 4G networks or other networks needs to be guaranteed. However, interoperability between different standard networks (such as 4G networks and 2G networks or 3G networks) in the prior art. The process is too complicated, which is not conducive to guarantee the deployment process of 5G networks.

Summary of the invention

Embodiments of the present invention provide a handover method and device, in order to simplify between different standard networks Interoperability process.

A first aspect of the embodiments of the present invention provides a handover method, including:

The first core network device receives a first handover request from the second core network device, where the first handover request carries a first internet protocol IP address and an address of a third core network device, the first IP address and the third The address of the core network device is used to establish a first access point name APN, where the first core network device is applied to the first standard network, and the second core network device and the third core network device are applied. In the second mode network, the first IP address is an IP address assigned by the second standard network to the terminal; and the first core network device is the first terminal in the first standard network to initiate the first a process of establishing an APN; the first core network device sends a second handover request to the access network device, wherein the access network device is applied to the first standard network; the first core network device is from the The access network device receives the response message of the second handover request; the first core network device sends a response message of the first handover request to the second core network device.

It can be seen that, after receiving the first handover request sent by the second core network device of the second standard network, the first core network device of the first-standard network is the terminal according to the address of the first IP address and the third core network device. Initiating a setup process of the first APN, and sending a second handover request to the access network device, and receiving a response message of the second handover request sent by the access network device, after which the first handover request is sent to the second core network device. Response message. Thereby, the terminal can switch from the second network system to the first network standard. It can be seen that the solution provided by the embodiment of the present invention does not require complicated mapping processes such as QoS mapping, Bearer ID mapping, and location identification, which simplifies the interoperation process between different standard networks, and is beneficial to the process of switching the terminal to a different standard network. Reduce the signaling interaction process of the network side device and improve the switching efficiency.

In a possible design, the first core network device initiates the establishment process of the first APN in the first standard network, and the first core network device sends the first core network device to the first gateway. a first create session request message, the first create session request message carrying the first IP address and an address of the third core network device; the first core network device receiving a first creation from the first gateway a session response message, the first create session response message is used to instruct the terminal to use the first IP address.

In a possible design, the first handover request further carries indication information, and the indication information The information is used to send the first notification message to the second core network device after the first core network device completes the process of establishing the first APN, and the method further includes: the first core network device The second core network device sends the first notification message, where the first notification message is used to notify the second core network device: the first core network device establishes the terminal for the terminal based on the first IP address. The first APN.

In a possible design, before the first core network device sends the second handover request to the first access network device, the method further includes: the first core network device receiving from the first gateway Carrying a create request message; the first core network device sends a bearer creation response message to the first gateway.

In a possible design, after the first core network device initiates the process of establishing the first APN in the first standard network, the method further includes: the first core network device Initiating a process of establishing a second APN in the first standard network for the terminal.

In a possible design, the first handover request further carries a second IP address and an address of a fourth core network device, where the second IP address is an IP allocated by the second standard network to the terminal An address, the fourth core network device is applied to the second standard network, where the first core network device is a process for the terminal to initiate a second APN in the first standard network, including: a core network device sends a second create session request message to the first gateway, where the second create session request message carries the second IP address and an address of the fourth core network device; the first core network device The first gateway receives a second create session response message, where the second create session response message is used to indicate that the terminal uses the second IP address.

In a possible design, after the first core network device initiates a process of establishing a second access point name APN in the first standard network, the method further includes: the first core The network device sends a second notification message to the second core network device, where the second notification message is used to notify the second core network device that the first core network device is based on the second IP address. The terminal establishes the second APN.

In a possible design, the response message of the first handover request carries at least one of the following: an attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

In a possible design, the first handover request further carries at least one of: an international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, the terminal a session management class context or terminal network capability information of the terminal in the first system network.

In a possible design, after the first core network device sends a response message of the first handover request to the second core network device, the method further includes: the first core network device from the first Receiving, by the gateway, a bearer creation request message; the first core network device receiving a completion message sent from the access network device and switching to the first standard network; the first core network device sending a bearer to the access network device Establishing a request message; the first core network device receives a bearer setup response message from the access network device; the first core network device sends a bearer creation response message to the first gateway.

In a possible design, after the first core network device receives the completion message sent from the access network device and switches to the first-standard network, the method further includes: the first core network device The second core network device sends a handover complete notification message; the first core network device receives a handover complete confirmation message from the second core network device.

A second aspect of the embodiments of the present invention further provides a handover method, including:

The second core network device receives the handover request message from the access network device, where the second core network device and the access network device are applied to the second standard network; and the second core network device is applied to the first core network The device sends a first handover request, where the first handover request carries a first Internet Protocol IP address and an address of a third core network device, where the first IP address and the address of the third core network device are used by the terminal. a process for establishing a first access point name APN of a standard network, wherein the first core network device is applied to the first standard network, and the third core network device is applied to the second standard network. The first IP address is an IP address assigned by the second standard network to the terminal; the second core network device receives a response message of the first handover request from the first core network device; the second core The network device sends a handover request response message to the access network device.

It can be seen that the second core network device of the second standard network receives the handover request message sent by the access network device of the second standard network, and the second core network device sends the first handover to the first core network device of the first standard network. Requesting, the first handover request carries the first internet protocol IP address and the address of the third core network device, and the first IP address and the address of the third core network device are used for the terminal in the first standard network After the first APN establishment process is completed, the second core network device receives the response message of the first handover request sent by the first core network device, and sends a handover request response message to the access network device. It can be seen that the solution of the embodiment of the present invention does not require complex QoS mapping, Bearer ID mapping, location identification and other mapping processes, which simplifies the interoperation process between different standard networks, and is beneficial to reduce the terminal switching to different standard networks. The signaling interaction process of the network side device improves the switching efficiency.

In a possible design, the first handover request further carries indication information, where the indication information is used to indicate to the second core network device after the first core network device completes the setup process of the first APN. After the first notification message is sent, after the second core network device sends the first handover request to the first core network device, the method further includes: the second core network device receiving, by the first core network device, the a first notification message, the first notification message is used to notify the second core network device that the first core network device establishes the first APN for the terminal based on the first IP address.

In a possible design, after the second core network device receives the first notification message from the first core network device, the method further includes: sending, by the second core network device, to the second policy device a third notification message, the third notification message is used to notify the second policy device: the first core network device establishes the first APN for the terminal based on the first IP address, where The second policy device is applied to the second system network.

In a possible design, the first handover request further carries a second IP address and an address of a fourth core network device, where the second IP address and the address of the fourth core network device are used by the terminal a process of establishing a second APN of the first-standard network, where the fourth core network device is applied to the second-standard network, and the second IP address is allocated by the second-standard network to the terminal IP address.

In a possible design, after the second core network device sends the first handover request to the first core network device, the method further includes: the second core network device receiving the first core network device And a second notification message, where the second notification message is used to notify the second core network device that the first core network device establishes the second APN for the terminal based on the second IP address.

In a possible design, the second core network device receives from the first core network device After the second notification message, the method further includes: the second core network device sending a fourth notification message to the second policy device, where the fourth notification message is used to notify the second policy device: the first The core network device establishes the second APN for the terminal based on the second IP address, and the second policy device is applied to the second standard network.

In a possible design, before the second core network device sends the first handover request to the first core network device, the method further includes: the second core network device receiving an attach request message from the terminal, where The attach request message carries terminal network capability information of the terminal in the first standard network.

In a possible design, before the sending, by the second core network device, the first handover request to the first core network device, the method further includes: the second core network device sending a query request message to the terminal; The second core network device receives a query request response message from the terminal, and the query request response message carries terminal network capability information of the terminal in the first standard network.

In a possible design, the first handover request further carries at least one of: an international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, the terminal The session management class context or the terminal network capability information of the terminal in the first system network.

In a possible design, the response message of the first handover request carries at least one of the following: an attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

In a possible design, after the second core network device receives the response message of the first handover request from the first core network device, the method further includes: the second core network device to the second The policy device sends a seventh notification message, where the seventh notification message is used to notify the second policy device that the terminal switches from the second standard network to the first standard network.

In a possible design, after the second core network device receives the response message of the first handover request from the first core network device, the method further includes: the second core network device to the first The core network device sends a handover complete confirmation message; the second core network device sends a ninth notification message to the second policy device, where the ninth notification message is used to notify the second policy device: the terminal The second system network switches to the first system network.

A third aspect of the embodiments of the present invention provides a method for creating a session, including:

The first gateway receives a first create session request message from the first core network device, where the first create session request message carries a first internet protocol IP address and a third core network device address, the first IP address and the first The address of the third core network device is used to establish a first access point name APN of the terminal in the first standard network, and the first core network device is applied to the first standard network, and the third core network device is applied. In the second mode network, the first IP address is an IP address assigned by the second standard network to the terminal; the first gateway sends a third create session request message to the second gateway, where the third creation is The session request message carries the first IP address and an address of the third core network device; the first gateway receives a third create session response message from the second gateway, where the third create session response message is used Instructing the terminal to use the first IP address; the first gateway sends a first create session response message to the first core network device, where the first create session response message is used to indicate Terminal uses the first IP address.

In a possible design, after the first gateway receives the first create session request message from the first core network device, the method further includes: the first gateway receiving the second creation from the first core network device a session request message, where the second create session request message carries a second internet protocol IP address and an address of a fourth core network device, where the second IP address and the address of the fourth core network device are used by the terminal a process of establishing a second APN of the first-standard network, where the fourth core network device is applied to the second-standard network, and the second IP is allocated by the second-standard network to the terminal An IP address; the first gateway sends a fourth create session request message to the second gateway, where the fourth create session request message carries the second IP address and an address of the fourth core network device; The first gateway receives a fourth create session response message from the second gateway, where the fourth create session response message is used to indicate that the terminal uses the second IP address; the first gateway is to the first A second core network apparatus transmits a Create Session Response message, the first message is used to create a session response indicating the second terminal using the IP address.

A fourth aspect of the embodiments of the present invention provides a method for creating a session, including:

The second gateway receives a third create session request message from the first gateway, where the third create session request message carries a first internet protocol IP address and an address of a third core network device, the first IP address and the third The address of the core network device is used for the first access point name of the terminal in the first standard network. The APN establishing process, wherein the third core network device is applied to the second standard network, the first IP address is an IP address allocated by the second standard network to the terminal; and the second gateway is a policy device sends a first credit control request message, where the first credit control request message is used to request to establish an IP connectivity access network session for the terminal based on the first IP address, where the first policy device Applying to the first standard network; the second gateway receives a first credit control response message from the first policy device; the second gateway sends a third create session response message to the first gateway, The third create session response message is used to instruct the terminal to use the first IP address.

In a possible design, after the second gateway receives the third create session request message from the first gateway, the method further includes: the second gateway according to the address of the third core network device The third core network device sends a first session establishment request message, where the first session establishment request message carries an address of the second gateway; and the second gateway receives a first session establishment response from the third core network device Message.

In a possible design, the first session establishment request message further carries an address of the first gateway.

In a possible design, after the second gateway sends a third create session response message to the first gateway, the method further includes: the second gateway receiving a fourth create session request from the first gateway a message, the fourth create session request message carries a second internet protocol IP address and an address of a fourth core network device, where the second IP address and the address of the fourth core network device are used by the terminal a process of establishing a second APN of the first standard network, wherein the fourth core network device is applied to the second standard network, and the second IP address is an IP allocated by the second standard network to the terminal The second gateway sends a second credit control request message to the first policy device, where the second credit control request message is used to request to establish an IP connectivity access network for the terminal based on the second IP a second gateway receives a second credit control response message from the first policy device; the second gateway sends a fourth create session response message to the first gateway, the fourth create session Message should be used to instruct the terminal to use the second IP address.

In a possible design, after the second gateway receives the fourth create session request message from the first gateway, the method further includes: the second gateway according to the address of the second core network device The fourth core network device sends a second session establishment request message, the second session establishment request The message carries an address of the second gateway; the second gateway receives a second session establishment response message from the fourth core network device.

In a possible design, the second session establishment request message further carries an address of the first gateway.

A fifth aspect of the embodiments of the present invention provides a method for creating a session, including:

The second policy device receives a service establishment request message from the application function device, where the service establishment request message carries the service requirement information, where the second policy device is applied to the second system network, and the application function device is applied to the first system. The network and the second-standard network; the second policy device establishes a first bearer for the terminal in the second-standard network according to the service requirement information.

In a possible design, the method further includes: the second policy device receiving a third notification message or a fourth notification message from the second core network device, where the third notification message is used to notify the second policy The first core network device establishes a first access point name APN in the first standard network, and the fourth notification message is used to notify the second policy, based on the first Internet Protocol IP address. The device: the first core network device establishes a second APN in the second standard network for the terminal based on the second IP address, where the first core network device is applied to the first standard network, The second core network device is applied to the second standard network, and the first IP address and the second IP address are IP addresses allocated by the second standard network to the terminal; the second policy The device establishes a second bearer for the terminal in the first standard network.

In a possible design, after the second policy device receives the third notification message or the fourth notification message from the second core network device, the method further includes: the second policy device sending the fifth message to the application function device a notification message, the fifth notification message is used to notify the application function device that the first core network device establishes the first APN in the first standard network for the terminal based on the first IP address And/or, the first core network device establishes the second APN in the first standard network for the terminal based on the second IP address.

In a possible design, the second policy device establishes a second bearer for the terminal in the first standard network, including: the second policy device according to the first IP address or the second IP The address is used to search for the service request information; the second policy device establishes the second bearer in the first standard network for the terminal according to the service requirement information.

In one possible design, the method further includes: the second policy device transmitting a credit re-authorization request message to the second gateway; the second policy device receiving a credit re-authorization response message from the second gateway.

In a possible design, before the second policy device sends a credit re-authorization request message to the second gateway, the method further includes: the second policy device according to the radio access technology type of the first-standard network And addressing to the second gateway according to the first IP address or the second IP address.

In a possible design, the method further includes: the second policy device receiving a seventh notification message or a ninth notification message from the second core network device, where the seventh notification message or the ninth notification message is used for notification The second policy device: the terminal switches from the second standard network to the first standard network, wherein the second core network device is applied to the second standard network.

In a possible design, after the second policy device receives the seventh notification message or the ninth notification message from the second core network device, the method further includes: the second policy device is configured according to the service requirement information The terminal establishes the second bearer in the first standard network.

In a possible design, after the second policy device receives the seventh notification message or the ninth notification message from the second core network device, the method further includes: sending, by the second policy device, the application function device And an eighth notification message, where the eighth notification message is used to notify the application function device that the terminal switches from the second standard network to the first standard network.

A sixth aspect of the embodiments of the present invention provides a method for establishing a bearer, including:

The application function device sends a service establishment request message to the second policy device, where the service establishment request message carries the service requirement information, so that the second policy device establishes a first bearer for the terminal in the second standard network, where the application The functional device is applied to the first system network and the second system network, and the second policy device is applied to the second system network; the application function device receives a fifth notification message from the second policy device, where The fifth notification message is used to notify the application function device that the first core network device establishes the first access point name APN in the first standard network for the terminal based on the first internet protocol IP address, and/or The first core network device establishes a second APN in the first standard network for the terminal based on the second IP address, where the first core network device is applied to the first standard network, where the first An IP address and the second IP address are the second system The IP address assigned by the network to the terminal; the application function device is a process for the terminal to initiate a second bearer in the first-standard network.

In a possible design, the application function device is a process for the terminal to initiate a second bearer in the first-standard network, including: the application function device according to the first IP address or the second The IP address is used to search for the service request information. The application function device initiates the process of establishing the second bearer in the first standard network according to the service requirement information.

In a possible design, the method further includes: the application function device sending an authentication authorization request message to the first policy device, where the first policy device is applied to the first system network; The device receives an authentication authorization response message from the first policy device.

In a possible design, before the application function device sends an authentication authorization request message to the first policy device, the method further includes: the application function device according to the wireless access technology type of the first system network, and Addressing the first policy device according to the first IP address or the second IP address.

A seventh aspect of the embodiments of the present invention provides a handover method, including:

The second access network device sends a handover request message to the second core network device, where the handover request message is used to request to switch the terminal from the second standard network to the first standard network, where the second access network device and The second core network device is applied to the second standard network; the second access network device receives a handover request response message from the second core network device, where the handover request response message carries at least one of the following: a message, a packet data network PDN connection establishment accept message or a session management SM request message, wherein the attach accept message carries a first access point name APN established by the first core network device for the terminal in the first standard network Information that the first access network device and the first core network device are applied to the first standard network; the second access network device sends a handover command message to the terminal, the handover command message Carrying at least one of the following: the attach accept message, the PDN connection setup accept message, or the SM request message.

An eighth aspect of the embodiments of the present invention provides a handover method, including:

The terminal receives a handover command message from the second access network device, where the handover command message carries at least one of: an attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message, where the attach accept message Carrying the first core network device as the terminal in the first The information of the first access point name APN established by the one-standard network, the PDN connection establishment accept message carrying the information of the second APN established by the first core network device in the first-standard network, the first connection The network access device and the first core network device are applied to the first standard network, and the second access network device is applied to a second standard network; the terminal establishes according to the attach accept message and the PDN connection At least one of the accept message or the SM request message accesses the first standard network; the terminal sends a handover complete message to the first access network device.

In a possible design, the attach accept message carries a first internet protocol IP address, and the first IP address is used in a process of establishing the first APN, wherein the first IP address is the second The IP address assigned by the standard network to the terminal.

In a possible design, the PDN connection establishment accept message carries a second IP address, and the second IP address is used for the establishment process of the second APN, where the second IP address is the second The IP address assigned by the standard network to the terminal.

In a possible design, before the terminal receives the handover command message from the second access network device, the method further includes: the terminal receiving a query request message from the second core network device, where the second core The network device is applied to the second system network; the terminal sends a query request response message to the second core network device, where the query request response message carries terminal network capability information of the terminal in the first standard network. .

In a possible design, after the terminal sends a handover complete message to the first access network device, the method further includes: the terminal establishing a second bearer for the terminal in the first standard network.

In a possible design, after the terminal sends a handover complete message to the first access network device, the method further includes: the terminal sending an eleventh notification message to the application function device, where the eleventh The notification message is used to notify the application function device that the terminal switches from the second system network to the first system network, wherein the application function device is applied to the first system network and the second system network .

A ninth aspect of the embodiments of the present invention further provides a joint attachment method, including:

Receiving, by the first core network device, a joint attach request message, where the joint attach request message carries a first internet protocol IP address and an address of a third core network device, where the first The IP address and the address of the third core network device are used for establishing a first access point name APN, wherein the first core network device is applied to a first standard network, and the second core network device and The third core network device is applied to the second standard network, where the first IP address is an IP address assigned by the second standard network to the terminal; and the first core network device is the terminal in the first format Initiating a process of establishing the first APN in the network; the first core network device sending a joint attach request response message to the second core network device.

In a possible design, the first core network device initiates the establishment process of the first APN in the first standard network, and the first core network device sends the first core network device to the first gateway. a first create session request message, the first create session request message carrying the first IP address and an address of the third core network device; the first core network device receiving a first creation from the first gateway a session response message, the first create session response message is used to instruct the terminal to use the first IP address.

In a possible design, after the first core network device initiates the process of establishing the first APN in the first standard network, the method further includes: the first core network device Initiating a process of establishing a second APN in the first standard network for the terminal.

In a possible design, the joint attach request message further carries a second internet protocol IP address and an address of a fourth core network device, wherein the second IP address is allocated by the second standard network to the terminal The IP address of the fourth core network device is applied to the second system network, where the first core network device initiates a process for establishing a second APN in the first standard network, including: The first core network device sends a second create session request message to the first gateway, where the second create session request message carries the second IP address and the address of the fourth core network device; the first core network The device receives a second create session response message from the first gateway, where the second create session response message is used to indicate that the terminal uses the second IP address.

In one possible design, the joint attach request response message carries at least one of the following: an attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

In a possible design, the joint attach request message further carries at least one of: an international mobile subscriber identity (IMSI) of the terminal, a security context of the terminal, and a shift of the terminal. a dynamic management context, a session management class context of the terminal, or terminal network capability information of the terminal in the first system network.

A tenth aspect of the embodiments of the present invention further provides a joint attachment method, including:

The second core network device receives an attach request message from the terminal, where the attach request message is used to request attachment to the first standard network, wherein the second core network device is applied to the second standard network; the second core network device Sending a joint attach request message to the first core network device, where the joint attach request message carries a first internet protocol IP address and an address of a third core network device, the first IP address and an address of the third core network device a process for establishing a first access point name APN of the terminal in the first standard network, where the first core network device is applied to the first standard network, and the third core network device is applied. In the second standard network, the first IP address is an IP address assigned by the second standard network to the terminal; and the second core network device receives a joint attach request response from the first core network device. The second core network device sends an attach request response message to the terminal.

In a possible design, after the second core network device receives the joint attach request response message from the first core network device, the method further includes: the second core network device sending a notification to the second policy device a message, the notification message is used to notify the second policy device: the first core network device establishes the first APN for the terminal based on the first IP address, where the second policy device Applied to the second system network.

In a possible design, the joint attach request message further carries a second IP address and an address of a fourth core network device, where the second IP address and the address of the fourth core network device are used by the terminal a process of establishing a second APN of the first-standard network, where the fourth core network device is applied to the second-standard network, and the second IP address is allocated by the second-standard network to the terminal IP address.

In a possible design, the notification message is further used to notify the second policy device that the first core network device establishes the second APN for the terminal based on the second IP address.

In a possible design, the attach request message carries terminal network capability information of the terminal in the first standard network.

In a possible design, the joint attach request message carries at least one of the following: The international mobile subscriber identity IMSI of the terminal, the security context of the terminal, the mobility management context of the terminal, the session management class context of the terminal, or the terminal network capability information of the terminal in the first standard network.

In one possible design, the joint attach request response message carries at least one of the following: an attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

An eleventh aspect of the embodiments of the present invention provides a method for establishing a bearer, including:

The second policy device receives a service establishment request message from the application function device, where the service establishment request message carries the service requirement information, where the second policy device is applied to the second system network, and the application function device is applied to the first system. The network and the second-standard network; the second policy device establishes a first bearer for the terminal in the second-standard network according to the service requirement information.

In a possible design, the method further includes: the second policy device receiving a notification message from the second core network device, where the notification message is used to notify the second policy device: the first core network device is based on the An Internet IP address is used to establish a first access point name APN for the terminal, where the first core network device is applied to the first standard network, and the second core network device is applied to the second standard And the first IP address is an IP address allocated by the second standard network to the terminal; and the second policy device establishes a second bearer for the terminal in the first standard network.

In a possible design, the notification message is further used to notify the second policy device: the first core network device establishes a second in the second standard network for the terminal based on the second IP address. The APN, wherein the second IP address is an IP address assigned by the second standard network to the terminal.

In a possible design, the second policy device establishes a second bearer for the terminal in the first standard network, including: the second policy device according to the first IP address or the second IP The address is used to search for the service request information; the second policy device establishes the second bearer in the first standard network for the terminal according to the service requirement information.

In one possible design, the method further includes: the second policy device transmitting a credit re-authorization request message to the second gateway; the second policy device receiving a credit re-authorization response message from the second gateway.

In a possible design, before the second policy device sends a credit re-authorization request message to the second gateway, the method further includes: the second policy device according to the type of the radio access technology of the first-standard network And addressing to the second gateway according to the first IP address or the second IP address.

A twelfth aspect of the embodiments of the present invention further provides an attaching method, including:

The terminal sends an attach request message to the second core network device, where the attach request message is used to request to be attached to the first standard network, where the second core network device is applied to the second standard network; The second core network device receives the response message of the attach request message, where the response message carries at least one of: an attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message, where the attach accept message Carrying the first core network device as the information of the first access point name APN established by the terminal in the first standard network, where the PDN connection establishment accept message carries the first core network device, and the terminal establishes the terminal in the first standard network. Information of the second APN, the first access network device and the first core network device are applied to the first standard network, and the second access network device is applied to a second standard network; the terminal And accessing the first-standard network according to at least one of the attach accept message, the PDN connection establishment accept message, or the SM request message.

In a possible design, the attach accept message carries a first internet protocol IP address, and the first IP address is used in a process of establishing the first APN, wherein the first IP address is the second The IP address assigned by the standard network to the terminal.

In a possible design, the PDN connection establishment accept message carries a second Internet Protocol IP address, and the second IP address is used for the establishment process of the second APN, wherein the second IP address is the The second system network assigns an IP address to the terminal.

In a possible design, the attach request message carries terminal network capability information of the terminal in the first standard network.

According to a thirteenth aspect of the embodiments of the present invention, a first core network device is provided, and the device has a function of implementing behavior of a first core network device in the foregoing method design. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible design, the first core network device includes a processor configured to support the first core network device to perform a corresponding function in the above method. Further, the first core network device may further include a receiver and a transmitter, and the receiver and the transmitter are configured to support communication between the first core network device and other network elements. Further, the first core network device may further include a memory for coupling with the processor, which stores necessary program instructions and data of the first core network device.

According to a fourteenth aspect of the embodiments of the present invention, a second core network device is provided, and the device has a function of implementing behavior of a second core network device in the foregoing method design. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In one possible design, the second core network device includes a processor configured to support the second core network device to perform corresponding functions in the above methods. Further, the second core network device may further include a receiver and a transmitter, and the receiver and the transmitter are configured to support communication between the second core network device and other network elements. Further, the second core network device may further include a memory for coupling with the processor, which stores necessary program instructions and data of the second core network device.

In a fifteenth aspect of the embodiments of the present invention, a first gateway is provided, the device having a function of implementing the behavior of the first gateway in the design of the foregoing method. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a sixteenth aspect of the embodiments of the present invention, a second gateway is provided, the device having a function of implementing the behavior of the second gateway in the design of the foregoing method. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

In a seventeenth aspect of the embodiments of the present invention, a policy device is provided, the device having a function of implementing behavior of a second policy device in the above method design. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

According to an eighteenth aspect of the embodiments of the present invention, an application function device is provided, the device having a function of implementing an action of applying a function device in the design of the foregoing method. The functions can be implemented by hardware, also The corresponding software implementation can be performed by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

According to a nineteenth aspect of the embodiments of the present invention, an access network device is provided, and the device has a function of implementing behavior of a second access network device in the foregoing method design. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

According to a twentieth aspect of the embodiments of the present invention, a terminal is provided, the device having a function of implementing a behavior of a terminal in the design of the foregoing method. The functions may be implemented by hardware or by corresponding software implemented by hardware. The hardware or software includes one or more modules corresponding to the functions described above.

A twenty-first aspect of the embodiments of the present invention provides a method for establishing a bearer, including:

The application function device sends a service establishment request message to the second policy device, where the service establishment request message carries the service requirement information, so that the second policy device establishes a first bearer for the terminal in the second standard network, where the application The functional device is applied to the first standard network and the second standard network, and the second policy device is applied to the second standard network;

The application function device receives an eighth notification message from the second policy device, where the eighth notification message is used to notify the application function device: the terminal switches from the second standard network to the first system The internet;

The application function device is a process for the terminal to initiate a second bearer in the first standard network.

A twenty-second aspect of the embodiments of the present invention provides a method for establishing a bearer, including:

The application function device sends a service establishment request message to the second policy device, where the service establishment request message carries the service requirement information, so that the second policy device establishes a first bearer for the terminal in the second standard network, where the application The functional device is applied to the first standard network and the second standard network, and the second policy device is applied to the second standard network;

The application function device receives an eleventh notification message from the terminal, where the eleventh notification message is used to notify the application function device that the terminal switches from the second standard network to the first standard network;

The application function device is that the terminal initiates establishment of a second bearer in the first standard network. process.

A twenty-third aspect of the embodiments of the present invention further provides a handover method, including:

The second core network device receives the handover request message from the access network device, where the second core network device and the access network device are applied to the second standard network; and the second core network device is applied to the first core network The device sends a first handover request, where the first handover request carries an address of the second core network device, and the second core network device receives a response message of the first handover request from the first core network device; The core network device sends a seventh notification message to the second policy device, where the seventh notification message is used to notify the second policy device: the terminal switches from the second standard network to the first standard network The second policy device is applied to the second standard network.

A twenty-fourth aspect of the embodiments of the present invention provides a handover method, including:

The second core network device receives the handover request message from the access network device, where the second core network device and the access network device are applied to the second standard network; and the second core network device is applied to the first core network The device sends a first handover request, where the first handover request carries an address of the second core network device, and the second core network device receives a response message of the first handover request from the first core network device; Receiving, by the core network device, a handover completion notification message from the first core network device; the second core network device sending a handover complete confirmation message to the first core network device; the second core network device to the second The policy device sends a ninth notification message, where the ninth notification message is used to notify the second policy device that the terminal switches from the second standard network to the first standard network.

A twenty-fifth aspect of the embodiments of the present invention further provides a handover method, including:

The first core network device receives a first handover request from the second core network device, where the first handover request carries an address of the second core network device, the first core network device is applied to the first standard network, and the second The core network device is applied to the second system network; the first core network device sends a response message of the first handover request to the second core network device; the first core network device sends the response message to the second core network device Switching completion notification message; the first core network device receiving a handover complete confirmation message from the first core network device.

In a possible design, after the first core network device receives the first handover request from the second core network device, the method further includes: the first core network device is the terminal initiating the first in the first standard network The process of establishing an APN.

In a possible design, the second core network device is deployed in combination with the second gateway, and the address of the second core network device carried by the first handover request is used to find the first APN in the process of establishing the first APN. Addressing the second core network device.

In a possible design, the response message of the first handover request sent by the first core network device to the second core network device carries an attach accept message, where the attach accept message carries the first core network device. Information about the first access point name APN established by the terminal in the first-standard network.

Compared with the prior art, after receiving the first handover request sent by the second core network device of the second standard network, the first core network device of the first-standard network receives the address according to the first IP address and the third core network device. And initiating a process of establishing a first APN for the terminal, and sending a second handover request to the access network device, and receiving a response message of the second handover request sent by the access network device, where the second core network device sends the A response message to switch requests. Thereby, the terminal can switch from the second network system to the first network standard. It can be seen that the solution provided by the embodiment of the present invention does not require complicated mapping processes such as QoS mapping, Bearer ID mapping, and location identification, which simplifies the interoperation process between different standard networks, and is beneficial to the process of switching the terminal to a different standard network. Reduce the signaling interaction process of the network side device and improve the switching efficiency.

DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the description of the prior art will be briefly described below. Obviously, the drawings in the following description are only 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.

FIG. 1 is a schematic diagram of a possible network architecture according to an embodiment of the present invention;

2 is a schematic diagram of communication of a handover method according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of communication of a joint attachment method according to an embodiment of the present invention; FIG.

4 is a schematic diagram of communication of another handover method according to an embodiment of the present invention;

4a is a schematic diagram of communication of another handover method according to an embodiment of the present invention;

FIG. 4b is a schematic diagram of communication of another handover method according to an embodiment of the present invention; FIG.

4c is a schematic diagram of communication of another handover method according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of communication of another handover method according to an embodiment of the present invention; FIG.

FIG. 5 is a schematic diagram of communication of a bearer establishment method according to an embodiment of the present invention;

FIG. 5a is a schematic diagram of communication of another bearer establishment method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of communication of another handover method according to an embodiment of the present invention;

FIG. 6 is a schematic diagram of communication of another handover method according to an embodiment of the present invention; FIG.

6b is a schematic diagram of communication of another handover method according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of communication of another bearer establishment method according to an embodiment of the present invention;

FIG. 7a is a schematic diagram of communication of another bearer establishment method according to an embodiment of the present invention;

FIG. 7b is a schematic diagram of communication of another bearer establishing method according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of communication of another joint attachment method according to an embodiment of the present invention; FIG.

FIG. 9 is a schematic diagram of communication of a session creation method according to an embodiment of the present invention;

FIG. 10 is a schematic diagram of communication of another session creation method according to an embodiment of the present invention;

FIG. 11 is a schematic structural diagram of a first core network device according to an embodiment of the present disclosure;

FIG. 11B is a schematic structural diagram of another first core network device according to an embodiment of the present disclosure;

12A is a schematic structural diagram of a second core network device according to an embodiment of the present invention;

FIG. 12B is a schematic structural diagram of another second core network device according to an embodiment of the present disclosure;

detailed description

The technical solutions in the embodiments of the present invention will be described below in conjunction with the accompanying drawings in the embodiments of the present invention.

The network architecture and the service scenario described in the embodiments of the present invention are used to more clearly illustrate the technical solutions of the embodiments of the present invention, and do not constitute a limitation of the technical solutions provided by the embodiments of the present invention. The technical solutions provided by the embodiments of the present invention are equally applicable to similar technical problems.

The following is a description of some possible application scenarios and network architectures applicable to the embodiments of the present invention.

FIG. 1 shows a possible network architecture provided by an embodiment of the present invention. The network architecture includes 4G network, 5G network and IP Multimedia Subsystem (IMS) network.

The terminal and the evolved base station (eNB, Evolved NodeB) in the 4G network may be connected by using a wireless link. The network side device of the 4G network mainly includes a Mobility Management Entity (MME), a Serving Gateway (SGW), a Policy and Charging Rules Function (PCRF) entity, and a packet data network. Gateway (PGW, PDN Gateway), etc.

When the terminal accesses the 5G network, the terminal and the Next Generation Radio Access Network (NG RAN) device can be connected by wireless link communication. The network side device of the 5G network mainly includes a CP (Control Plane Function) entity, a first user plane control function (UP Function 1, User Plane Function 1) entity, and a second user plane control function (UP Function 2). , User Plane Function 2) entity.

The IMS network includes a Proxy-Call Session Control Function (P-CSCF) entity, an Access Transfer Control Function (ATCF) entity, and an Access Forward Gate (ATGW) entity. In addition, an Application Function (AF) device is an application layer entity that provides policy and charging control for a transport plane resource, and corresponds to a P-CSCF entity and an ATCF entity in the IMS network.

In the embodiments of the present invention, the terms "network" and "system" are often used interchangeably, but those skilled in the art can understand the meaning thereof. The terminal involved in the embodiments of the present invention may include various handheld devices, in-vehicle devices, wearable devices, computing devices, or other processing devices connected to the wireless modem, and various forms of user equipment (User Equipment). , UE), mobile station (MS), terminal device, and the like. For convenience of description, the devices mentioned above are collectively referred to as terminals.

The embodiments of the present invention will be further described in detail below based on the common aspects of the embodiments of the present invention described above.

In the existing solution, the interoperation process between different standard networks is too complicated, which is not conducive to ensuring the deployment process of the 5G network.

In view of this, an embodiment of the present invention provides a handover method, and a first core based on the method. Heart network equipment and second core network equipment. The method includes: the second core network device receives a handover request message from the second access network device, where the second core network device and the second access network device are applied to the second standard network; the second core network device is first The core network device sends a first handover request, where the first handover request carries a first Internet Protocol (IP) address and an address of the third core network device, where the address of the first IP address and the third core network device is used by the terminal The first access point name (APN) establishment process of the first standard network, wherein the first core network device is applied to the first standard network, and the third core network device is applied to the second system network, first The IP address is an IP address assigned by the second standard network to the terminal; the first core network device is a process in which the terminal initiates the establishment of the first APN in the first standard network; the first core network device sends the second access to the first access network device. a handover request, where the first access network device is applied to the first standard network; the first core network device receives a response message of the second handover request from the first access network device; The network device sends a response message of the first handover request to the second core network device, and the second core network device sends a handover request response message to the second access network device. The establishment process of the foregoing first APN may also be referred to as an attachment process of the first APN. In the handover method provided by the embodiment of the present invention, after the second core network device of the second-standard network receives the handover request message from the second access network device, the first handover is sent to the first core network device of the first-standard network. The request carries the first IP address and the address of the third core network device of the second standard network for the establishment process of the first APN of the terminal in the first standard network, and then receives the first handover from the first core network device. After the response message is requested, a handover request response message is sent to the access network device, so that the terminal switches from the second-standard network to the first-standard network. It can be seen from the above that in the embodiment of the present invention, the interoperation process between the first standard network and the second standard network is simple, and complex processes including various parameter mappings are not required.

In the solution provided by the embodiment of the present invention, the first standard network may be a 4G network, a 3G network, or a 2G network, and the second standard network may be a 5G network; or the first standard network may be a 5G network, and the second standard network may be 4G network, 3G network or 2G network. Of course, the solution of the embodiment of the present invention may be applied to other scenarios, which are not limited in the embodiment of the present invention.

The switching method provided by the embodiment of the present invention is described below with reference to FIG. FIG. 2 shows a handover method provided by an embodiment of the present invention. The method includes: sections 201-207, as follows:

In section 201, the second core network device receives a handover request message from the second access network device.

The second core network device and the second access network device are applied to the second standard network.

In the 202 part, the second core network device sends a first handover request to the first core network device, where the first handover request carries the first IP address and the address of the third core network device, and the first IP address and the third core network device The address is used in the process of establishing the first APN of the terminal in the first-standard network.

The first core network device is applied to the first standard network, the third core network device is applied to the second standard network, and the first IP address is the IP address allocated by the second standard network for the terminal.

In an example, before the second core network device sends the first handover request to the first core network device, the method of the embodiment of the present invention may further include: the second core network device receives the attach request message from the terminal, and the attach request message carries the terminal. Terminal network capability information in a first-standard network.

In an example, before the second core network device sends the first handover request to the first core network device, the method of the embodiment of the present invention may further include: the second core network device sends a query request message to the terminal; the second core network device The query request response message is received from the terminal, and the query request response message carries the terminal network capability information of the terminal in the first standard network.

In an example, the first handover request may further carry at least one of the following: an International Mobile Subscriber Identity (IMSI) of the terminal, a security context of the terminal, a mobility management context of the terminal, and a terminal. The session management class context or the terminal network capability information of the terminal in the first standard network.

In section 203, the first core network device initiates a process of establishing a first APN in the first standard network.

In an example, the process of the first core network device initiating the first APN may include: the first core network device sends a first create session request message to the first gateway, where the first create session request message carries the first The IP address and the address of the third core network device; the first core network device receives a first create session response message from the first gateway, where the first create session response message is used to indicate that the terminal uses the first IP address. The first gateway may be applied to the first-standard network, or the first gateway may also be applied to the first-standard network and the second-standard network. It can be seen that, in the embodiment of the present invention, the IP address used by the terminal in the first-standard network is the IP address used in the second-standard network, that is, after the terminal switches from the second-standard network to the first-standard network, The IP address used remains unchanged.

In this example, after the first gateway receives the first create session request message from the first core network device, the method of the embodiment of the present invention may further include: the first gateway sends a third create session request message to the second gateway, and the third The session creation session request message carries the first IP address and the address of the third core network device; the first gateway receives a third creation session response message from the second gateway, and the third session creation response message is used to indicate that the terminal uses the first IP address. The second gateway may be applied to the first standard network, or the second gateway may be applied to the first standard network and the second standard network.

In this example, after the second gateway receives the third create session request message from the first gateway, the method of the embodiment of the present invention may further include: the second gateway sends the first credit control request message to the first policy device, the first credit The control request message is configured to request to establish an IP connectivity access network session for the terminal based on the first IP address, where the first policy device is applied to the first standard network; and the second gateway receives the first credit control response message from the first policy device. .

In this example, after the second gateway receives the third create session request message from the first gateway, the method of the embodiment of the present invention may further include: the second gateway sends the third core network device according to the address of the third core network device. A session establish request message, the first session establishment request message carries an address of the second gateway; and the second gateway receives a first session establishment response message from the third core network device. Optionally, the first session establishment request message may further carry an address of the first gateway.

In an example, the first handover request further carries the indication information, where the indication information is used to indicate that the first core network device sends the first notification message to the second core network device after completing the setup process of the first APN, and the method of the embodiment of the present invention The first core network device sends a first notification message to the second core network device, where the first notification message is used to notify the second core network device that the first core network device establishes the first terminal for the terminal based on the first IP address. APN.

In an example, the method of the embodiment of the present invention may further include: the first core network device receives a bearer creation request message from the first gateway; and the first core network device sends a bearer creation response message to the first gateway.

In an example, after the second core network device receives the first notification message from the first core network device, the method of the embodiment of the present invention may further include: the second core network device sends a third notification message to the second policy device, where The third notification message is used to notify the second policy device: the first core network device is based on the first The IP address establishes a first APN for the terminal, and the second policy device is applied to the second standard network.

In an example, the method of the embodiment of the present invention may further include: the first core network device is a process for the terminal to initiate the establishment of the second APN in the first standard network.

In an example, the first handover request further carries the second IP address and the address of the fourth core network device, and the second IP address and the address of the fourth core network device are used for the establishment process of the second APN, where the second IP The address is the IP address assigned by the second-standard network to the terminal, and the fourth core network device is applied to the second-standard network. The process of the first core network device initiating the second APN may include: sending, by the first core network device, the first gateway And creating a session request message, where the second create session request message carries the second IP address and the address of the fourth core network device; the first core network device receives the second create session response message from the first gateway, and the second create session response message The second terminal is used to instruct the terminal to use the second IP address.

In this example, after the first gateway receives the second create session request message from the first core network device, the method of the embodiment of the present invention may further include: the first gateway sends a fourth create session request message to the second gateway, and fourth The session creation session request message carries the second IP address and the address of the fourth core network device; the first gateway receives the fourth creation session response message from the second gateway, and the fourth session creation response message is used to indicate that the terminal uses the second IP address.

In this example, after the second gateway receives the fourth create session request message from the first gateway, the method of the embodiment of the present invention may further include: the second gateway sends a second credit control request message to the first policy device, the second credit The control request message is used to request to establish an IP connectivity access network session for the terminal based on the second IP address; the second gateway receives the second credit control response message from the first policy device.

In this example, after the second gateway receives the fourth create session request message from the first gateway, the method of the embodiment of the present invention may further include: the second gateway sends the first core network device according to the address of the fourth core network device. The second session establishment request message carries the address of the second gateway; the second gateway receives the second session establishment response message from the fourth core network device. Optionally, the second session establishment request message may further carry an address of the first gateway.

In an example, the method of the embodiment of the present invention may further include: the first core network device sends a second notification message to the second core network device, where the second notification message is used to notify the second core network device: the first core network device A second APN is established for the terminal based on the second IP address.

In one example, the second core network device receives the second notification message from the first core network device. The method of the embodiment of the present invention may further include: the second core network device sends a fourth notification message to the second policy device, where the fourth notification message is used to notify the second policy device that the first core network device is based on the second IP address. A second APN is established for the terminal.

In an example, before the second policy device receives the third notification message or the fourth notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device from the application function (AF) The device receives the service establishment request message, where the service establishment request message carries the service requirement information, where the application function device is applied to the first system network and the second system network; and the second policy device establishes the terminal for the terminal according to the service requirement information in the second system network. One bearer. The application function device may be an application server (Application Server).

In an example, after the second policy device receives the third notification message or the fourth notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device establishes the terminal for the terminal in the first standard network. Two bearers.

In this example, the establishing, by the second policy device, the second bearer for the terminal in the first-standard network may include: the second policy device searches for service requirement information according to the first IP address or the second IP address; and the second policy device is configured according to the service requirement information. Establishing a second bearer for the terminal in the first standard network.

In an example, after the second policy device receives the third notification message or the fourth notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device sends the fifth notification message to the application function device. The fifth notification message is used to notify the application function device: the first core network device establishes the first APN in the first standard network for the terminal based on the first IP address, and/or the first core network device is based on the second IP address The terminal establishes a second APN in the first-standard network. After the application function device receives the fifth notification message from the second policy device, the terminal may initiate a process of establishing the second bearer in the first-standard network.

In this example, the application function device initiates the establishment process of the second bearer, which may include: the application function device searches for service requirement information according to the first IP address or the second IP address; and the application function device uses the service requirement information as the terminal in the first format. The network initiates the establishment process of the second bearer.

In an example, the method of the embodiment of the present invention may further include: the second policy device receiving, by the second core network device, a seventh notification message or a ninth notification message, where the seventh notification message or the ninth notification message is used by Notifying the second policy device: the terminal switches from the second standard network to the The first system network, wherein the second core network device is applied to the second system network.

In this example, after the second policy device receives the seventh notification message or the ninth notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device from the second core network After the device receives the seventh notification message or the ninth notification message, the method further includes: the second policy device establishing, by the second policy device, the second bearer in the first standard network according to the service requirement information.

In this example, after the second policy device receives the seventh notification message or the ninth notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device to the application function The device sends an eighth notification message, where the eighth notification message is used to notify the application function device that the terminal switches from the second standard network to the first standard network.

In an example, the method of the embodiment of the present invention may further include: the application function device sends an authentication authorization request message to the first policy device; and the application function device receives the authentication authorization response message from the first policy device.

In this example, before the application function device sends the authentication authentication request message to the first policy device, the method of the embodiment of the present invention may further include: applying the function device according to the wireless access technology type of the first standard network, and according to the first The IP address or the second IP address is addressed to the first policy device.

In an example, the method of the embodiment of the present invention may further include: the second policy device sends a credit re-authorization request message to the second gateway; and the second policy device receives the credit re-authorization response message from the second gateway.

In this example, before the second policy device sends the credit re-authorization request message to the second gateway, the method of the embodiment of the present invention may further include: the second policy device according to the type of the radio access technology of the first-standard network, and according to the An IP address or a second IP address is addressed to the second gateway.

In section 204, the first core network device sends a second handover request to the first access network device.

The first access network device is applied to the first standard network.

In section 205, the first core network device receives a response message of the second handover request from the first access network device.

In section 206, the first core network device sends a response message of the first handover request to the second core network device.

In an example, the response message of the first handover request may carry at least one of the following: an attach accept message, a packet data network (PDN) connection establishment accept message, or a session management (SM) request message.

In an example, after the first core network device sends the response message of the first handover request to the second core network device, the method of the embodiment of the present invention may further include: the first core network device receives the bearer creation request message from the first gateway. After the first core network device receives the completion message sent from the access network device and switches to the first standard network, the first core network device sends a bearer setup request message to the access network device; the first core network device accesses the access network. The device receives the bearer setup response message; the first core network device sends a bearer creation response message to the first gateway.

In an example, after the first core network device receives the completion message that is sent from the access network device and is switched to the first-standard network, the method of the embodiment of the present invention may further include: the first core network device to the second core network device Sending a handover complete notification message; the first core network device receives a handover complete confirmation message from the second core network device.

In section 207, the second core network device sends a handover request response message to the second access network device.

In an example, after the second core network device receives the response message of the first handover request from the first core network device, the method of the embodiment of the present invention may further include: the second core network device sends the seventh notification to the second policy device. The message, the seventh notification message is used to notify the second policy device that the terminal switches from the second standard network to the first standard network.

In an example, after the second core network device receives the response message of the first handover request from the first core network device, the method of the embodiment of the present invention may further include: the second core network device sends the handover completion to the first core network device. And confirming the message; the second core network device sends a ninth notification message to the second policy device, where the ninth notification message is used to notify the second policy device that the terminal switches from the second standard network to the first standard network.

In an example, the handover request response message may carry at least one of the following: an attach accept message, a PDN connection setup accept message, or an SM request message, where the attach accept message may carry the first core network device as a terminal established in the first standard network. The information of the first APN, the PDN connection establishment accept message may carry the information of the second APN established by the first core network device in the first standard network, and the SM request message may carry the bearer information of the terminal in the first standard network.

In an example, after the second access network device receives the handover request response message from the second core network device, the method of the embodiment of the present invention may further include: the second access network device sends a handover command message to the terminal. The handover command message may carry at least one of the following: an attach accept message, a PDN connection setup accept message, or an SM request message.

In an example, the method of the embodiment of the present invention may further include: the terminal receiving, by the second access network device, a handover command message, where the handover command message carries at least one of the following: an attach accept message, a PDN connection setup accept message, or an SM request message. The terminal accesses the first-standard network according to at least one of an attach accept message, a PDN connection establishment accept message, or an SM request message; the terminal sends a handover complete message to the first access network device.

In this example, after the terminal sends the handover complete message to the first access network device, the method of the embodiment of the present invention may further include: the terminal establishing the second bearer for the terminal in the first standard network.

In this example, after the terminal sends the handover complete message to the first access network device, the method of the embodiment of the present invention may further include: the terminal sends an eleventh notification message to the application function device, where the eleventh notification message is used to notify the application. Functional device: The terminal switches from the second standard network to the first standard network, wherein the application function device is applied to the first system network and the second system network.

In one example, the attach accept message can carry the first IP address.

In one example, the PDN Connection Setup Accept message may carry a second IP address.

It can be seen from the above that in the embodiment of the present invention, the interoperation process between the first standard network and the second standard network is simple, and complex processes including various parameter mappings are not required.

The embodiment of the invention further provides a joint attachment method, and a first core network device and a second core network device based on the method. The method includes: the second core network device receives an attach request message from the terminal, where the second core network device is applied to the second standard network; the second core network device sends a joint attach request message to the first core network device, and the joint attach request The message carries the first IP address and the address of the third core network device, where the first IP address and the address of the third core network device are used for establishing the first APN of the terminal in the first standard network, where the first core network device The first core network device is applied to the second standard network, the first IP address is the IP address assigned by the second standard network to the terminal, and the first core network device is the terminal initiated in the first standard network. An APN establishing process; the first core network device sends a joint attach request response message to the second core network device; the second core The heart network device sends an attach request response message to the terminal. The establishment process of the foregoing first APN may also be referred to as an attachment process of the first APN. In the joint attaching method provided by the embodiment of the present invention, after receiving the attach request message from the terminal, the second core network device of the second-standard network carries the first in the joint attach request message sent to the first core network device of the first-standard network. An IP address and an address of the third core network device of the second standard network for the establishment process of the first APN of the terminal in the first standard network, and then receiving the joint attach request response message from the first core network device, and The terminal sends an attach request response message. It can be seen from the above that in the embodiment of the present invention, the interoperation process between the first standard network and the second standard network is simple, and complex processes including various parameter mappings are not required.

The joint attachment method provided by the embodiment of the present invention will be described below with reference to FIG. FIG. 3 shows a joint attachment method provided by an embodiment of the present invention. The method includes: sections 301 to 306, as follows:

In Section 301, the second core network device receives an attach request message from the terminal, and the attach request message is used to request attachment to the first standard network.

The second core network device is applied to the second standard network.

In an example, the attach request message may carry terminal network capability information of the terminal in the first-standard network.

In section 302, the second core network device sends a joint attach request message to the first core network device, where the joint attach request message carries the first IP address and the address of the third core network device, the first IP address and the third core network device. The address is used in the process of establishing the first APN of the terminal in the first-standard network.

The first core network device is applied to the first standard network, the third core network device is applied to the second standard network, and the first IP address is the IP address allocated by the second standard network for the terminal.

In an example, the joint attach request message further carries the second IP address and the address of the fourth core network device, and the second IP address and the address of the fourth core network device are used by the terminal in the second APN of the first standard network. The establishing process, wherein the fourth core network device is applied to the second standard network, and the second IP address is an IP address allocated by the second standard network for the terminal.

In an example, the joint attach request message may further carry at least one of the following: an IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, or a terminal network capability of the terminal in the first standard network. information.

The portion 302 is similar to the portion 203 in FIG. 2. For the specific implementation of the portion 302, reference may be made to the detailed description of the portion 203 in FIG. 2, and details are not described herein.

In section 303, the first core network device initiates a process of establishing a first APN in the first-standard network.

In section 304, the first core network device sends a joint attach request response message to the second core network device.

In an example, after the second core network device receives the joint attach request response message from the first core network device, the method of the embodiment of the present invention may further include: the second core network device sends a notification message to the second policy device, and the notification message is The second policy device is configured to: the first core network device establishes a first APN for the terminal based on the first IP address, where the second policy device is applied to the second standard network.

In one example, the notification message is further used to notify the second policy device that the first core network device establishes the second APN for the terminal based on the second IP address.

In an example, before the second policy device receives the notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device receives the service establishment request message from the application function device, where the service establishment request message carries the service. Requirement information, wherein the application function device is applied to the first system network and the second system network.

In this example, after the second policy device receives the notification message from the second core network device, the method of the embodiment of the present invention may further include: the second policy device establishing the second bearer for the terminal in the first standard network.

In an example, the second policy device establishes the second bearer for the terminal in the first mode network, and the method includes: the second policy device searches for the service requirement information according to the first IP address or the second IP address; and the second policy device is configured according to the service request. The information is that the terminal establishes a second bearer in the first standard network.

In an example, the method of the embodiment of the present invention may further include: the second policy device sends a credit re-authorization request message to the second gateway; and the second policy device receives the credit re-authorization response message from the second gateway.

In this example, before the second policy device sends the credit re-authorization request message to the second gateway, the method of the embodiment of the present invention may further include: the second policy device according to the type of the radio access technology of the first-standard network, and according to the An IP address or a second IP address is addressed to the second gateway.

In one example, the Federated Attach Request Response message may carry at least one of the following: an Attach Accept message, a PDN Connection Setup Accept message, or a Session Management SM Request message.

In one example, the attach accept message can carry the first IP address.

In one example, the PDN Connection Setup Accept message may carry a second IP address.

In one example, the SM request message may carry bearer information of the terminal in the first mode network.

In section 305, the second core network device sends an attach request response message to the terminal.

In section 306, the terminal accesses the first standard network.

In one example, the terminal may access the first-standard network according to at least one of an attach accept message, a PDN connection setup accept message, or an SM request message.

The joint attachment method provided by the embodiment of the present invention has many similarities with the above-mentioned handover method shown in FIG. 2, and is simple for description. The joint attachment method is similar to the handover method shown in FIG. 2, and can be referred to. The detailed description in the method shown in FIG. 2 is not described herein.

When the network architecture shown in FIG. 1 is applied, each network element involved in the foregoing handover method and the joint attachment method may be the corresponding network element in FIG. 1. For example, the first core network device may be an MME, the core network device may be a CP function, the first gateway may be a SGW, the second gateway may be a PGW, the first policy device may be a PCRF, and the second policy device may be a Policy Function, The application function device may be an AF, the second access network device may be an NG RAN, the first access network device may be an eNB, and the third core network device and the fourth core network device may be an UP function.

The solution of the embodiment of the present invention is further described below with reference to more drawings.

As shown in FIG. 4, it is assumed that the first-standard network is a 4G network, and the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is a first user plane control function UP Function 1 entity of the 5G network, and the fourth core network device is a second user plane control function UP Function 2 entity of the 5G network, the first access network device The evolved base station eNB of the 4G network, the second access network device is the next-generation radio access network NG RAN entity of the 5G network, the first gateway is the serving gateway SGW of the 4G network, and the second gateway is the PDN gateway PGW of the 4G network In addition, the function of the service gateway user plane may be included in the third core network device and the fourth core network device, so the figure is identified as UP Function1 & PGW-U and UP Function 2 & PGW-U, respectively, for convenience. In the process description, the third core network device represents UP Function1, the fourth core network device represents UP Function2, the first policy device is a policy and charging rule function PCRF entity of the 4G network, and the second policy device is a policy function policy of the 5G network. The function of the service is as follows: The PCRF in the 4G network and the Policy Function in the 5G network are deployed independently. The service switching method disclosed in the embodiment of the present invention includes:

1a, the terminal reports the neighbor cell signal measurement result to the 5G access network device NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G;

S401, the NG RAN entity sends a handover request message Handover Required to the CP Function entity;

S402. After receiving the handover request message, the CP Function entity sends a first handover request Forward Relocation Request to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN ;

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network ;

The terminal network capability information can be obtained by the following two methods:

Route 1, the terminal carries the terminal network capability information in an attach request message Attach Request sent to the CP Function entity;

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function entity.

Further, the first handover request may further carry preset first indication information; The preset first indication information is used to indicate that the MME sends the first notification message to the CP Function entity after completing the establishment process of the first access point name APN.

Further, the first handover request may further carry preset second indication information, where the preset second indication information is used to indicate that the MME sends the CP to the CP after completing the establishment process of the second access point name APN. The Function entity sends a second notification message.

S403. After the first MME receives the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S404, the MME sends a first notification message Notify1 to the CP Function entity after completing the establishment process of the first access point name (APN, Access Point Name);

The MME performs the step S404 only when it is detected that the first indication request carries the preset first indication information. The first notification message is used to notify the CP Function entity that the MME establishes the first APN for the terminal based on the first IP address.

S405, after receiving the first notification message, the CP Function entity sends a third notification message Notify3 to the policy function Policy Function entity;

The third notification message is used to notify the Policy Function entity that the MME establishes the first APN for the terminal based on the first IP address.

S406, after receiving the third notification message, the Policy Function entity sends a fifth notification message Notify5 to the application function AF device;

The fifth notification message is used to notify the AF device that the MME establishes the first APN for the terminal based on the first IP address.

S407, the MME is a process for the terminal to initiate a second access point APN in the 4G network.

S408, after completing the establishment process of the second APN, the MME sends a second notification message Notify2 to the CP Function entity;

The MME performs the step S408 only after detecting that the first handover request carries the preset second indication information. The second notification message is used to notify the CP Function entity that the MME establishes the terminal for the terminal based on the second IP address. The second APN.

S409, the CP Function entity receives the second notification message, and sends a fourth notification message Notify4 to the policy function Policy Function entity;

The fourth notification message is used to notify the Policy Function entity that the MME establishes the second APN for the terminal based on the second IP address.

S410, after receiving the fourth notification message, the Policy Function entity sends a sixth notification message Notify6 to the AF device;

The sixth notification message is used to notify the AF device that the MME establishes the second APN for the terminal based on the second IP address.

S411. After receiving the sixth notification message, the AF device initiates a process of creating a second bearer.

S412, the MME detects that the first APN and the second APN are established, and after the second bearer is created, sends a second handover request Handover Request to the eNB.

S413. After receiving the second handover request, the eNB sends a second handover request response Handover Request Acknowledge to the MME.

S414. After receiving the second handover request response, the MME sends a first handover request response Forward Relocation Response to the CP Function entity.

The first handover request response carries at least one of the following:

An attach accept message, a packet data network PDN connection setup accept message, and a session management SM request message.

S415. After receiving the first handover request response, the CP Function entity sends a handover request response message Handover Required Response to the NG RAN entity.

The handover request response message carries at least one of the following:

An attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

S416, after receiving the handover request response message, the NG RAN sends a handover command Handover Command to the terminal;

The switching command carries at least one of the following:

Attach Accept Message, Packet Data Network PDN Connection Setup Accept Message or Session Management SM Ask for news.

S417. The terminal sends a handover complete message Handover Complete to the eNB.

The handover completion message carries at least one of the following:

An attach accept message, a packet data network PDN connection setup accept message, and a session management SM request message.

Further, please refer to FIG. 5. FIG. 5 is a possible implementation manner of the process of creating a second bearer by the AF device in step 411, which is described in FIG. The process of establishing the first bearer is the same as the process of establishing the first bearer of the first IP address. The following takes the second IP address as an example to describe the specific process of establishing the second bearer, which specifically includes the following steps:

1a, the AF device sends a service establishment request message to the Policy Function entity, that is, the establishment request of the first bearer, and the service establishment request message carries the service request information;

S501. The AF device searches for the service requirement information by using the first IP address, and after addressing the PCRF by using the first IP address and the radio access technology type of the 4G network, to the PCRF. Sending an authentication authorization request message AAR;

Wherein the AAR carries the first IP address;

S502, after receiving the AAR, the PCRF is addressed to the PGW-C by using the first IP address, and sends a re-authentication request message RAR to the PGW-C;

S503, after receiving the RAR, the PGW-C sends a re-authentication response message RAA to the PCRF;

S504. After receiving the RAA, the PCRF sends an authentication authorization response message to the AF device.

S505, the PGW-C sends a bearer creation request message Create Bearer Request to the MME through the SGW.

S506, the SGW forwards the bearer creation request message to the MME;

S507. After receiving the bearer creation request message, the MME sends a bearer creation response message Create Bearer Response to the SGW.

S508. The MME sends a bearer creation response message to the PGW-C by using the SGW.

As shown in FIG. 6, it is assumed that the first-standard network is a 4G network, and the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is the first user plane control function UP Function1 entity of the 5G network, the fourth core network device is the second user plane control function UP Function2 entity of the 5G network, and the first access network device is 4G The evolved base station eNB of the network, the second access network device is a next-generation radio access network NG RAN entity of the 5G network, the first gateway is a serving gateway SGW of the 4G network, and the second gateway is a PDN gateway PGW of the 4G network, and In the third core network device and the fourth core network device, the function of the service gateway user plane may be included, so the figure is identified as UP Function1&PGW-U and UP Function2&PGW-U respectively. For convenience, the process description, the third core The network device represents UP Function1, the fourth core network device represents UP Function2, the first policy device is a policy and charging rule function PCRF entity of the 4G network, and the second policy device is When the policy function of the 5G network is a policy function entity, and the PCRF in the 4G network and the policy function in the 5G network are deployed in a unified manner, the service switching method disclosed in the embodiment of the present invention includes:

1a, the terminal reports the signal measurement result of the neighboring cell to the NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G;

S601, the NG RAN sends a handover request message Handover Required to the CP Function entity;

S602. After receiving the handover request message Handover Required, the CP Function entity sends a first handover request Forward Relocation Request to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN ;

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, and the terminal a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network;

The terminal network capability information can be obtained by the following two methods:

Route 1, the terminal carries the terminal network capability information Attach Request in an attach request message sent to the CP Function entity;

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function.

Further, the first handover request may further carry preset first indication information, where the preset first indication information is used to indicate that the MME sends the CP to the CP after completing the establishment process of the first access point name APN. The Function entity sends a first notification message.

Further, the first handover request may further carry preset second indication information, where the preset second indication information is used to indicate that the MME sends the CP to the CP after completing the establishment process of the second access point name APN. The Function entity sends a second notification message.

S603. After the first MME receives the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S604, after completing the establishment process of the first APN, the MME sends a first notification message Notify1 to the CP Function entity;

The MME performs the step S604 only after detecting that the first handover request carries the preset first indication information. The first notification message is used to notify the CP Function entity that the MME establishes the first APN for the terminal based on the first IP address.

S605, after receiving the first notification message, the CP Function entity sends a third notification message Notify3 to the policy function Policy Function entity;

The third notification message is used to notify the Policy Function that the MME establishes the first APN for the terminal based on the first IP address.

S606, the MME is a process for the terminal to initiate a second access point name APN in a 4G network.

S607, after completing the establishment process of the second APN, the MME sends a second notification message Notify2 to the CP Function entity;

The MME performs the step S408 only after detecting that the first handover request carries the preset second indication information. The second notification message is used to notify the CP Function entity that the MME establishes the second APN for the terminal based on the second IP address.

S608, after completing the establishment process of the second APN, the MME sends a fourth notification message Notify4 to the CP Function;

The fourth notification message is used to notify the Policy Function entity that the MME establishes the second APN for the terminal based on the second IP address.

S609. After receiving the fourth notification message, the Policy Function entity initiates a process of creating a second bearer.

S610, the MME detects that the first APN and the second APN are established, and after the second bearer is created, sends a second handover request Handover Request to the eNB.

S611, the eNB sends a second handover request response Handover Request Acknowledge to the MME;

S612, the MME sends a first handover request response Forward Relocation Response to the CP Function entity;

The first handover request response carries at least one of the following:

An attach accept message, a packet data network PDN connection setup accept message, and a session management SM request message.

S613. The CP Function entity sends a handover request response message Handover Required Response to the NG RAN entity.

The handover request response message carries at least one of the following:

An attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

S614, the NG RAN sends a handover command Handover Command to the terminal;

The switching command carries at least one of the following:

An attach accept message, a packet data network PDN connection setup accept message, or a session management SM request message.

S615. The terminal sends a handover complete Handover Complete message to the eNB.

Further, please refer to FIG. 7. FIG. 7 is a possible implementation manner of a process for creating a second dedicated bearer in step 609, which is described in FIG. The process of establishing the first bearer of the first IP address is the same. The following takes the second IP address as an example to describe the specific process of establishing the second bearer. The specific steps include the following steps:

1a, the Policy Function entity receives a service establishment request message sent by the AF device, and the service establishment request message carries service request information, before the terminal initiates the process of establishing the second bearer;

S701. The Policy Function entity searches for the service requirement information by using the first IP address, and addresses the PGW-C by using the first IP address and the wireless access technology type of the 4G network, and sends the PGW-C to the PGW- C sends a re-authentication request message RAR;

S702, after receiving the RAR, the PGW-C sends a re-authentication response message RAA to the PCRF;

S703, the PGW-C sends a bearer creation request message Create Bearer Request to the SGW;

S704, the SGW forwards the bearer creation request message to the MME;

S705. After receiving the bearer creation request message, the MME sends a bearer creation response message Create Bearer Response to the SGW.

S706. The SGW forwards the bearer creation response message to the PGW-C.

As shown in FIG. 4a, it is assumed that the first-standard network is a 4G network, the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is a first user plane control function UP Function 1 entity of the 5G network, and the fourth core network device is a second user plane control function UP Function 2 entity of the 5G network, the first access network device The evolved base station eNB of the 4G network, the second access network device is the next-generation radio access network NG RAN entity of the 5G network, the first gateway is the serving gateway SGW of the 4G network, and the second gateway is the PDN gateway PGW of the 4G network In addition, the function of the service gateway user plane may be included in the third core network device and the fourth core network device, so In the process description, the third core network device represents UP Function1, the fourth core network device represents UP Function2, and the first policy device is a 4G network policy and The charging rule function is a PCRF entity, and the second policy device is a policy function of the 5G network, and the PCRF in the 4G network is deployed independently. The service switching method disclosed in the embodiment of the present invention includes:

1a. The terminal reports the neighbor cell signal measurement result to the 5G access network device NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G.

S4a01, the NG RAN entity sends a handover request message (for example, Handover Required) to the CP Function entity.

S4a02: After receiving the handover request message, the CP Function entity sends a first handover request (for example, Forward Relocation Request) to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN .

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network .

The terminal network capability information can be obtained by the following two methods:

The terminal 1 carries the terminal network capability information in an attach request message Attach Request sent to the CP Function entity.

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function entity.

S4a03, after receiving the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S4a04, the MME is a process for the terminal to initiate a second access point APN in the 4G network.

S4a05: The MME detects that the first APN and the second APN are established, and sends a second handover request (for example, a Handover Request) to the eNB.

S4a06: After receiving the second handover request, the eNB sends a second handover request response (for example, Handover Request Acknowledge) to the MME.

S4a07: After receiving the second handover request response, the MME sends a first handover request response (for example, Forward Relocation Response) to the CP Function entity.

The first handover request response carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4a08, after receiving the first handover request response, the CP Function entity sends a seventh notification message (for example, Notify7) to the Policy Function entity.

The seventh notification message is used to notify the Policy Function entity that the terminal switches from the 5G network to the 4G network.

Optionally, if the CP Function entity is deployed in the same manner as the PGW-C entity, that is, the CP Function has the function of the PGW-C, the first handover request in the step S4a02 may not carry the The first IP address and the address of the UP Function 1 entity, or the address of the second IP address and the UP Function 2 entity, but the address of the CP Function is directly carried, wherein the address of the CP Function is used in step S4a03 The CP Function entity is addressed during the establishment of the first APN in the process of establishing the second APN in step S4a04, in which case the CP Function entity receives the first handover request response. Afterwards, the seventh notification message Notify7 is sent to the Policy Function entity.

S4a09, after receiving the seventh notification message, the Policy Function entity sends an eighth notification message (for example, Notify8) to the AF device.

The eighth notification message is used to notify the AF device that the terminal switches from the 5G network to the 4G network.

S4a10: After receiving the eighth notification message, the AF device initiates a process of creating a second bearer.

For the specific process of S4a10, please refer to Figure 5a.

As shown in FIG. 4b, it is assumed that the first-standard network is a 4G network, and the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is a first user plane control function UP Function 1 entity of the 5G network, and the fourth core network device is a second user plane control function UP Function 2 entity of the 5G network, the first access network device The evolved base station eNB of the 4G network, the second access network device is the next-generation radio access network NG RAN entity of the 5G network, the first gateway is the serving gateway SGW of the 4G network, and the second gateway is the PDN gateway PGW of the 4G network In addition, the function of the service gateway user plane may be included in the third core network device and the fourth core network device, so the figure is identified as UP Function1 & PGW-U and UP Function 2 & PGW-U respectively. For convenience, the process description, The third core network device represents UP Function1, the fourth core network device represents UP Function2, the first policy device is a 4G network policy and charging rule function PCRF entity, and the second policy is set. 5G network policy function as a Policy Function entity; a handover method and a business network 4G and 5G the PCRF Policy Function entity independent of the network deployment, embodiments of the present invention is disclosed comprising:

1a. The terminal reports the neighbor cell signal measurement result to the 5G access network device NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G.

S4b01, the NG RAN entity sends a handover request message (for example, Handover Required) to the CP Function entity.

S4b02: After receiving the handover request message, the CP Function entity sends a first handover request (for example, Forward Relocation Request) to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN ;

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network ;

The terminal network capability information can be obtained by the following two methods:

The terminal 1 carries the terminal network capability information in an attach request message Attach Request sent to the CP Function entity.

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function entity.

S4b03, after receiving the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S4b04, the MME is a process for the terminal to initiate a second access point APN in the 4G network.

S4b05, the MME detects that the first APN and the second APN are established, and sends a second handover request (for example, a Handover Request) to the eNB.

S4b06: After receiving the second handover request, the eNB sends a second handover request response (for example, Handover Request Acknowledge) to the MME.

S4b07: After receiving the second handover request response, the MME sends a first handover request response (for example, Forward Relocation Response) to the CP Function entity.

The first handover request response carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4b08, after receiving the first handover request response, the CP Function entity sends a handover request response message (for example, Handover Required Response) to the NG RAN entity.

The handover request response message carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4b09, after receiving the handover request response message, the NG RAN sends a handover command (for example, a Handover Command) to the terminal.

The switching command carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4b10: The terminal sends a handover complete message (for example, Handover Complete) to the eNB.

S4b11: After receiving the handover complete message, the eNB entity sends a handover to a 4G network completion message (for example, Handover to E-UTRAN Complete) to the MME entity.

S4b12: After receiving the handover to the 4G network completion message, the MME entity sends a handover completion notification message (for example, Forward Relocation Complete Notification) to the CP Function entity.

S4b13: After receiving the handover completion notification message, the CP Function entity sends a handover complete acknowledgement message (for example, Forward Relocation Complete Acknowledge) to the MME entity.

S4b14: After sending the handover complete confirmation message, the CP Function entity sends a ninth notification message (for example, Notify9) to the Policy Function entity.

The ninth notification message is used to notify the Policy Function entity that the terminal switches from the 5G network to the 4G network.

Optionally, if the CP Function entity is deployed in the same manner as the PGW-C entity, that is, the CP Function has the function of the PGW-C, the first handover request in the step S4b02 may not carry the The first IP address and the address of the UP Function 1 entity, or the address of the second IP address and the UP Function 2 entity, but the address of the CP Function is directly carried, wherein the address of the CP Function is used in step S4b03 Addressing the CP Function entity during the establishment of the second APN in step S4b04 in the process of establishing the first APN, in which case the CP Function entity sends the handover completion acknowledgement message Sending the ninth notification message Notify9 to the Policy Function entity.

S4b15: After receiving the ninth notification message, the Policy Function entity sends a tenth notification message (for example, Notify10) to the AF device.

The tenth notification message is used to notify the AF device that the terminal switches from the 5G network to the 4G network.

S4b16: After receiving the tenth notification message, the AF device initiates a process of creating a second bearer.

The process of creating the second bearer is a live network process, and details are not described herein.

As shown in FIG. 4c, it is assumed that the first-standard network is a 4G network, the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is a first user plane control function UP Function 1 entity of the 5G network, and the fourth core network device is a second user plane control function UP Function 2 entity of the 5G network, the first access network device The evolved base station eNB of the 4G network, the second access network device is the next-generation radio access network NG RAN entity of the 5G network, the first gateway is the serving gateway SGW of the 4G network, and the second gateway is the PDN gateway PGW of the 4G network In addition, the function of the service gateway user plane may be included in the third core network device and the fourth core network device, so the figure is identified as UP Function1 & PGW-U and UP Function 2 & PGW-U respectively. For convenience, the process description, The third core network device represents UP Function1, the fourth core network device represents UP Function2, the first policy device is a 4G network policy and charging rule function PCRF entity, and the second policy is set. 5G network policy function as a Policy Function entity; a handover method and a business network 4G and 5G the PCRF Policy Function entity independent of the network deployment, embodiments of the present invention is disclosed comprising:

1a. The terminal reports the neighbor cell signal measurement result to the 5G access network device NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G.

S4c01, the NG RAN entity sends a handover request message (for example, Handover Required) to the CP Function entity.

S4c02: After receiving the handover request message, the CP Function entity sends a first handover request (for example, Forward Relocation Request) to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN .

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network .

The terminal network capability information can be obtained by the following two methods:

The terminal 1 carries the terminal network capability information in an attach request message Attach Request sent to the CP Function entity.

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function entity.

S4c03, after receiving the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S4c04, the MME is a process for the terminal to initiate a second access point APN in the 4G network.

S4c05, the MME detects that the first APN and the second APN are established, and sends a second handover request (for example, a Handover Request) to the eNB.

S4c06: After receiving the second handover request, the eNB sends a second handover request response (for example, Handover Request Acknowledge) to the MME.

S4c07, after receiving the second handover request response, the MME sends a first handover request response (for example, Forward Relocation Response) to the CP Function entity.

The first handover request response carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4c08, after receiving the first handover request response, the CP Function entity sends a handover request response message (for example, Handover Required Response) to the NG RAN entity.

The handover request response message carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4c09, after receiving the handover request response message, the NG RAN sends a handover command (for example, a Handover Command) to the terminal.

The switching command carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4c10: After receiving the handover command, the terminal sends a handover complete message (for example, Handover Complete) to the eNB.

S4c11, after receiving the handover complete message, the terminal sends an eleventh notification message (for example, Notify11) to the AF device, where the terminal may send the to the AF device by using session initiation protocol SIP signaling. The eleventh notification message.

The eleventh notification message is used to notify the AF device that the terminal switches from the 5G network to the 4G network.

S4c12: After receiving the eleventh notification message, the AF device initiates a process of creating a second bearer.

The process of creating the second bearer is a live network process, and details are not described herein.

As shown in FIG. 4d, it is assumed that the first-standard network is a 4G network, the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is a first user plane control function UP Function 1 entity of the 5G network, and the fourth core network device is a second user plane control function UP Function 2 entity of the 5G network, the first access network device The evolved base station eNB of the 4G network, the second access network device is the next-generation radio access network NG RAN entity of the 5G network, the first gateway is the serving gateway SGW of the 4G network, and the second gateway is the PDN gateway PGW of the 4G network In addition, the function of the service gateway user plane may be included in the third core network device and the fourth core network device, so the figure is identified as UP Function1 & PGW-U and UP Function 2 & PGW-U respectively. For convenience, the process description, The third core network device represents UP Function1, the fourth core network device represents UP Function2, the first policy device is a 4G network policy and charging rule function PCRF entity, and the second policy is set. 5G network policy function as a Policy Function entity; a handover method and a business network 4G and 5G the PCRF Policy Function entity independent of the network deployment, embodiments of the present invention is disclosed comprising:

1a. The terminal reports the neighbor cell signal measurement result to the 5G access network device NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G.

S4d01, the NG RAN entity sends a handover request message to the CP Function entity (for example) Such as: Handover Required).

S4d02: After receiving the handover request message, the CP Function entity sends a first handover request (for example, Forward Relocation Request) to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN ;

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network ;

The terminal network capability information can be obtained by the following two methods:

Route 1, the terminal carries the terminal network capability information in an attach request message Attach Request sent to the CP Function entity;

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function entity.

S4d03, after receiving the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S4d04, the MME is a process for the terminal to initiate a second access point APN in the 4G network.

S4d05, the MME detects that the first APN and the second APN are established, and sends a second handover request (for example, a Handover Request) to the eNB.

S4d06: After receiving the second handover request, the eNB sends a second handover request response (for example, Handover Request Acknowledge) to the MME.

S4d07, after receiving the second handover request response, the MME sends the CP Function to the CP Function. The entity sends a first handover request response Forward Relocation Response.

The first handover request response carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4d08, after receiving the first handover request response, the CP Function entity sends a handover request response message (for example, Handover Required Response) to the NG RAN entity.

The handover request response message carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4d09: After receiving the handover request response message, the NG RAN sends a handover command (for example, a Handover Command) to the terminal.

The switching command carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S4d10: After receiving the handover command, the terminal sends a handover complete message (for example, Handover Complete) to the eNB.

S4d11, after receiving the handover complete message, the terminal initiates a process of creating a second bearer;

The process of creating the second bearer is a live network process, and details are not described herein.

Further, please refer to FIG. 5a, which is a possible implementation manner of the process of creating a second bearer by the AF device in step 4a10, which is described in FIG. 4a, the second bearer setup process for the second IP address, The process of establishing the first bearer is the same as the process of establishing the first bearer of the first IP address. The following takes the second IP address as an example to describe the specific process of establishing the second bearer, which specifically includes the following steps:

1a, the AF device sends a service establishment request message to the Policy Function entity, that is, the establishment request of the first bearer, and the service establishment request message carries the service requirement information.

S5a01, the AF device searches for the service request information by using the first IP address, and after addressing the PCRF by using the first IP address and the radio access technology type of the 4G network, to the PCRF. Send an authentication authorization request message (for example: AAR).

The AAR carries the first IP address.

S5a02, after receiving the AAR, the PCRF entity addresses the PGW-C entity by using the first IP address, and sends a re-authentication request message (for example, RAR) to the PGW-C entity.

S5a03, after receiving the RAR, the PGW-C entity sends a re-authentication response message (for example, RAA) to the PCRF entity.

S5a04: After receiving the RAA, the PCRF entity sends an authentication authorization response message to the AF device.

S5a05, the PGW-C entity sends a bearer creation request message (for example, Create Bearer Request) to the MME entity by using the SGW entity.

S5a06, the SGW entity forwards the bearer creation request message to the MME entity;

When the MME entity receives the bearer creation request message, it needs to wait for the handover to complete, and then execute the remaining bearer creation process.

S5a07-S5a09 corresponds to the steps S415-S417 in FIG. 4, and details are not described herein again.

S5a10: After receiving the handover complete message, the eNB entity sends a handover to a 4G network completion message (for example, Handover to E-UTRAN Complete) to the MME entity.

S5a11: After receiving the handover from the eNB entity to the 4G network completion message Handover to E-UTRAN Complete, the MME entity sends a bearer setup request message (for example, Bearer Setup Request) to the eNB entity.

S5a12: After receiving the bearer setup message, the eNB entity sends a radio resource control connection reset message (for example, RRC Connection Reconfiguration) to the terminal.

S5a13: After receiving the radio resource control connection reset message, the terminal sends a radio resource control connection reset complete message (for example, RRC Connection Reconfiguration Complete) to the eNB entity.

S5a14: After receiving the radio resource control connection reset complete message, the eNB sends a bearer setup response message (for example, a Bearer Setup Response message) to the MME entity.

S5a15: After receiving the bearer setup response message, the MME sends a bearer creation response message (for example, Create Bearer Response) Create Bearer Response to the SGW.

S5a16: The SGW sends a bearer creation response message to the PGW-C.

As shown in FIG. 6a, it is assumed that the first-standard network is a 4G network, and the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. CP Function entity, the third core network device is the first user of the 5G network The second control network function is an UP Function1 entity, the fourth core network device is a second user plane control function UP Function2 entity of the 5G network, the first access network device is an evolved base station eNB of the 4G network, and the second access network device is a 5G network. The next-generation radio access network NG RAN entity, the first gateway is a serving gateway SGW of the 4G network, the second gateway is a PDN gateway PGW of the 4G network, and the third core network device and the fourth core network device may include The function of the service gateway user plane is therefore identified as UP Function1&PGW-U and UP Function2&PGW-U respectively. For convenience, in the process description, the third core network device represents UP Function1, and the fourth core network device represents UP Function2, The policy device is a policy and charging rule function PCRF entity of the 4G network, and the second policy device is a policy function of the 5G network, and the policy function of the 5G network is combined with the policy function of the 5G network. The service switching method disclosed in the embodiment of the invention includes:

1a. The terminal reports the signal measurement result of the neighboring cell to the NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G.

S6a01, the NG RAN sends a handover request message (for example, Handover Required) to the CP Function entity.

S6a02: After receiving the handover request message Handover Required, the CP Function entity sends a first handover request (for example, Forward Relocation Request) to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used to establish a first access point name APN .

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network .

The terminal network capability information can be obtained by the following two methods:

Route 1, the terminal carries the terminal network capability information Attach Request in an attach request message sent to the CP Function entity.

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function.

S6a03, after receiving the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S6a04, the MME is a process for the terminal to initiate a second access point name APN in a 4G network.

S6a05, the MME detects that the first APN and the second APN are established, and after the second bearer is created, sends a second handover request (for example, Handover Request) to the eNB.

S6a06: The eNB sends a second handover request response (for example, Handover Request Acknowledge) to the MME.

S6a07: The MME sends a first handover request response (for example, Forward Relocation Response) to the CP Function entity.

The first handover request response carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S6a08, after receiving the first handover request response, the CP Function entity sends a seventh notification message to the Policy Function entity after receiving the first handover request response to the CP Function entity (for example, Notify7). .

The seventh notification message is used to notify the Policy Function entity that the terminal switches from the 5G network to the 4G network.

Optionally, if the CP Function entity is deployed in the same manner as the PGW-C entity, that is, the CP Function has the function of the PGW-C, the first handover request in the step S6a02 may not carry the The address of the first IP address and the UP Function 1 entity, or the address of the second IP address and the UP Function 2 entity, but the address of the CP Function is directly carried, wherein the address of the CP Function is used in step S6a03 The establishment of the first APN Addressing the CP Function entity in the process of establishing the second APN in step S6a04, in which case the CP Function entity receives the first handover request response, and then goes to the Policy Function entity. Sending the seventh notification message Notify7.

S6a09: After receiving the seventh notification message, the Policy Function entity initiates a process of creating a second bearer.

For the specific process of S6a09, please refer to Figure 7a.

As shown in FIG. 6b, it is assumed that the first-standard network is a 4G network, the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is the first user plane control function UP Function1 entity of the 5G network, the fourth core network device is the second user plane control function UP Function2 entity of the 5G network, and the first access network device is 4G The evolved base station eNB of the network, the second access network device is a next-generation radio access network NG RAN entity of the 5G network, the first gateway is a serving gateway SGW of the 4G network, and the second gateway is a PDN gateway PGW of the 4G network, and In the third core network device and the fourth core network device, the function of the service gateway user plane may be included, so the figure is identified as UP Function1&PGW-U and UP Function2&PGW-U respectively. For convenience, the process description, the third core The network device represents UP Function1, the fourth core network device represents UP Function2, the first policy device is a policy and charging rule function PCRF entity of the 4G network, and the second policy device 5G network policy function of the Policy Function entity; and 4G networks Policy PCRF and 5G network entity Function unity when deployed, operational embodiment of the present invention as disclosed in Example handover method comprising:

1a. The terminal reports the signal measurement result of the neighboring cell to the NG RAN, and the NG RAN decides to switch the terminal from 5G to 4G.

S6b01, the NG RAN sends a handover request message (for example, Handover Required) to the CP Function entity.

S6b02: After receiving the handover request message Handover Required, the CP Function entity sends a first handover request (for example, Forward Relocation Request) to the MME.

The first handover request carries: a first Internet Protocol IP address and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used for the first access Point name APN establishment process.

In addition, the first handover request may further carry: a second Internet Protocol IP address of the terminal and an address of an UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used for the second access Point name APN establishment process.

Further, the first handover request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network .

The terminal network capability information can be obtained by the following two methods:

Route 1, the terminal carries the terminal network capability information Attach Request in an attach request message sent to the CP Function entity.

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function.

S6b03, after receiving the first handover request, the MME initiates a process of establishing a first access point name APN in the 4G network.

S6b04, the MME is a process for the terminal to initiate a second access point name APN in the 4G network.

S6b05, the MME detects that the first APN and the second APN are established, and after the second bearer is created, sends a second handover request (for example, a Handover Request) to the eNB.

S6b06, the eNB sends a second handover request response (for example, Handover Request Acknowledge) to the MME.

S6b07, the MME sends a first handover request response (for example, Forward Relocation Response) to the CP Function entity.

The first handover request response carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S6b08, the CP Function entity sends a handover request response to the NG RAN entity. Information (for example: Handover Required Response).

The handover request response message carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S6b09, the NG RAN sends a handover command (for example, a Handover Command) to the terminal.

The switching command carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S6b10: The terminal sends a handover complete message (for example, Handover Complete) to the eNB.

S6b11: After receiving the handover complete message, the eNB entity sends a handover to a 4G network completion message (for example, Handover to E-UTRAN Complete) to the MME entity.

S6b12: After receiving the handover to the 4G network completion message, the MME entity sends a handover completion notification message (for example, Forward Relocation Complete Notification) to the CP Function entity.

S6b13: After receiving the handover completion notification message, the CP Function entity sends a handover complete acknowledgement message (for example, Forward Relocation Complete Acknowledge) to the MME entity.

S6b14: After sending the handover complete confirmation message, the CP Function entity sends a ninth notification message (for example, Notify9) to the Policy Function entity.

The ninth notification message is used to notify the Policy Function entity that the terminal switches from the 5G network to the 4G network.

Optionally, if the CP Function entity is deployed in the same manner as the PGW-C entity, that is, the CP Function has the function of the PGW-C, the first handover request in the step S6b02 may not carry the The address of the first IP address and the UP Function 1 entity, or the address of the second IP address and the UP Function 2 entity, but the address of the CP Function is directly carried, wherein the address of the CP Function is used in step S6b03 Addressing the CP Function entity during the establishment of the second APN in step S6b04 in the process of establishing the first APN, in which case the CP Function entity sends the handover completion acknowledgement message To The Policy Function entity sends the ninth notification message Notify9.

S6b15: After receiving the ninth notification message, the Policy Function entity initiates a process of creating a second bearer.

For the creation process of the second bearer in step S6b15, please refer to FIG. 7b.

Further, referring to FIG. 7a, FIG. 7a is a possible implementation manner of a process for creating a second dedicated bearer in the step 6a09 described in FIG. 6a, where the second bearer setup process for the second IP address is performed, The process of establishing the first bearer of the first IP address is the same. The following takes the second IP address as an example to describe the specific process of establishing the second bearer. The specific steps include the following steps:

1a. The Policy Function entity receives a service establishment request message sent by the AF device, and the service establishment request message carries the service requirement information.

S7a01, the Policy Function entity searches for the service requirement information by using the first IP address, and addresses the PGW-C by using the first IP address and the wireless access technology type of the 4G network, and sends the PGW-C to the PGW- C sends a re-authentication request message (for example: RAR).

S7a02: After receiving the RAR, the PGW-C sends a re-authentication response message (for example, RAA) to the PCRF.

S7a03, the PGW-C sends a bearer creation request message (for example, Create Bearer Request) to the SGW.

S7a04, the SGW forwards the bearer creation request message to the MME.

When the MME entity receives the bearer creation request message, it needs to wait for the handover to complete, and then execute the remaining bearer creation process.

S7a05-S7a07, corresponding to the steps S613-S615 in Figure 6, will not be described here.

S7a08, after receiving the handover complete message, the eNB entity sends a handover to a 4G network completion message (for example, Handover to E-UTRAN Complete) to the MME entity.

S7a09: After receiving the handover from the eNB entity to the 4G network completion message Handover to E-UTRAN Complete, the MME entity sends a bearer setup request message (for example, Bearer Setup Request) to the eNB entity.

S7a10: After receiving the bearer setup message, the eNB entity sends a radio resource control connection reset message (for example, RRC Connection Reconfiguration) to the terminal.

S7a11: After receiving the radio resource control connection reset message, the terminal sends a radio resource control connection reset complete message (for example, RRC Connection Reconfiguration Complete) to the eNB entity.

S7a12: After receiving the radio resource control connection reset complete message, the eNB sends a bearer setup response message message (for example, Bearer Setup Response) to the MME entity.

S7a13: After receiving the bearer setup response message, the MME sends a bearer creation response message (for example, Create Bearer Response) to the SGW.

S7a14: The SGW sends a bearer creation response message to the PGW-C.

Further, referring to FIG. 7b, FIG. 7b is a possible implementation manner of the process of creating a second dedicated bearer of the step 6b15 described in FIG. 6b, the second bearer establishment process for the second IP address, and the The process of establishing the first bearer of an IP address is the same. The following takes the second IP address as an example to describe the specific process of establishing the second bearer. The specific steps include the following steps:

1a, the Policy Function entity receives a service establishment request message sent by the AF device, and the service establishment request message carries service request information, before the terminal initiates the process of establishing the second bearer;

S7b01, the Policy Function entity searches for the service requirement information by using the first IP address, and addresses the PGW-C by using the first IP address and the wireless access technology type of the 4G network, and sends the PGW-C to the PGW- C sends a re-authentication request message (for example: RAR).

S7b02, after receiving the RAR, the PGW-C sends a re-authentication response message (for example, RAA:) to the PCRF.

S7b03, the PGW-C sends a bearer creation request message (for example, Create Bearer Request) to the SGW.

S7b04, the SGW forwards the bearer creation request message to the MME.

S7b05, the MME entity sends a bearer setup request message (for example, Bearer Setup Request) to the eNB entity.

S7b06: After receiving the bearer setup message, the eNB entity sends a radio resource control connection reset message (for example, RRC Connection Reconfiguration) to the terminal.

S7b07, after receiving the radio resource control connection reset message, the terminal sends a radio resource control connection reset complete message to the eNB entity (for example: RRC Connection Reconfiguration Complete).

S7b08, after receiving the RRC connection reset complete message, the eNB sends a bearer setup response message message (for example, Bearer Setup Response) to the MME entity.

S7b09: After receiving the bearer setup response message, the MME sends a bearer creation response message (for example, Create Bearer Response) to the SGW.

S7b10: The SGW sends a bearer creation response message to the PGW-C.

As shown in FIG. 8, it is assumed that the first-standard network is a 4G network, and the second-standard network is a 5G network, the first core network device is a mobility management entity MME of the 4G network, and the second core network device is a control plane function of the 5G network. The CP function entity, the third core network device is the first user plane control function UP Function 1 entity of the 5G network, the fourth core network device is the second user plane control function UP Function 2 entity of the 5G network, and the first gateway is the 4G network. The service gateway SGW, the second gateway is the PDN gateway PGW of the 4G network, and the third core network device and the fourth core network device may include the function of the service gateway user plane, so the figure is respectively identified as UP Function1&PGW-U And UP Function2&PGW-U. For convenience, in the process description, the third core network device represents UP Function1, the fourth core network device represents UP Function2, and the first policy device is a 4G network policy and charging rule function PCRF entity, The second policy device may be a policy function of the 5G network, and the service switching method disclosed in the embodiment of the present invention includes:

S801, the terminal in the 5G network sends an attach request message Attach Request to the CP Function entity;

The attach request message includes a network bearer capability information UE network capability of the terminal.

S802. After receiving the attach request message, the CP Function entity sends a joint attach request to the MME.

The joint attach request carries: a first Internet Protocol IP address of the terminal and an address of an UP Function1 entity, where the first IP address and the address of the UP Function1 entity are used for a first access point name APN Establishment process

In addition, the joint attach request may further carry: a second IP address of the terminal and an address of the UP Function 2 entity, where the second IP address and the address of the UP Function 2 entity are used. Establishing a second access point name APN;

Further, the joint attach request may further carry at least one of the following:

An international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, and terminal network capability information of the terminal in the first standard network;

The terminal network capability information can be obtained by the following two methods:

Route 1, the terminal carries the terminal network capability information in the attach request message Attach Request sent to the CP Function entity;

The route 2, the CP Function entity sends a query request message Query Request to the terminal, and the terminal carries the terminal network capability information in the query request response message sent to the CP Function.

S803. The MME initiates a process of establishing a first access point name APN.

S804. The MME initiates a process of establishing a second access point name APN.

S805, the MME sends a joint attach request response to the CP Function entity, a Combined Attach Response;

The joint attach request response message carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

S806. After the MME establishes that the MME establishes the first APN, it sends a notification message to notify the Policy Function that the MME has established the first UE in the first-standard network based on the first IP address. An APN, optionally, if the MME establishes the second APN, the notification message further includes: the MME has established the second APN in the first-standard network for the UE based on the second IP address. ;

S807, after receiving the joint attach request response, the CP Function entity sends an attach request response Attach Request Response to the terminal;

The attach accept message carries at least one of the following:

The attach accept message, the packet data network PDN connection establishment accept message.

With reference to the embodiment shown in FIG. 4 to FIG. 8 , please refer to FIG. 9 , which is a possible implementation manner of the process for establishing the first APN according to the embodiment of the present invention. APN The establishment process includes the following steps:

S901: The MME sends a location update request Update Location Request message to the user home server HSS.

S902. After receiving the location update request message, the HSS sends a location update confirmation Update Location Response message to the MME.

S903, after receiving the location update confirmation message, the MME sends a first session creation request Create Session Request 1 to the SGW;

The first session creation request carries the first IP address and the address of the third core network device UP Function1 of the second standard network;

S904, after receiving the first session creation request, the SGW sends a third session creation request Create Session Request 3 to the PGW-C;

The third session creation request message carries the first IP address and the address of the third core network device UP Function1 of the second standard network;

S905, after receiving the third session creation request, the PGW-C sends a first session establishment request Session Establishment Request1 to the UP Function1 &PGW-U;

The first session establishment request message carries the address PGW-C Address of the PGW-C, and may also carry the address SGW Address of the SGW;

S906. The UP Function 1 entity sends a first session establishment response message to the PGW-C.

S907. After receiving the first session establishment response, the PGW-C sends a first credit control request message CCR1 to the PCRF, requesting to establish an IP connectivity access network session for the first IP address.

S908, after receiving the CCR1, the PCRF sends a first credit control response message CCA1 to the PGW-C;

S909, after receiving the first credit control response message, the PGW-C sends a third session creation response Create Session Response3 to the SGW;

The third session creation response includes a 5G IP1, and is used to indicate that the terminal uses the first IP address.

S910, after receiving the third session creation response, the SGW sends a first session creation response Create Session Response1 to the MME;

The first session creation response includes a 5G IP1, and is used to instruct the terminal to use the first IP address.

With reference to the embodiment shown in FIG. 4 to FIG. 8 , please refer to FIG. 10 , which is a possible implementation manner of the process of establishing the second APN according to the embodiment of the present invention. The APN establishment process includes the following steps:

S1001, the MME sends a second session creation request Create Session Request 2 to the SGW;

The second session creation request message carries a second IP address 5G IP2 and an address UP Function Address2 of the UP Function 2 entity;

S1002, after receiving the second session creation request, the SGW sends a fourth session creation request Create Session Request 4 to the PGW-C;

The fourth session creation request carries the second IP address and the address UP Function Address2 of the UP Function 2 entity.

S1003, after receiving the fourth session creation request, the PGW-C sends a second session establishment request Session Establishment Request2 to the UP Function2 &PGW-U;

The second session establishment request carries the address PGW-C Address of the PGW-C, and may also carry the address SGW Address of the SGW.

S1004, after receiving the second session establishment request, the UP Function 2 entity sends a second session establishment response Session Establishment Rsponse2 to the PGW-C;

S1005: After receiving the second session establishment response, the PGW-C sends a second credit control request message CCR2 to the PCRF, requesting to establish an IP connectivity access network session for the second IP address.

S1006, after receiving the second credit control request message, the PCRF sends a second credit control response message CCA2 to the PGW-C;

S1007, after receiving the second credit control response message, the PGW-C sends a fourth session creation response Create Session Response4 to the SGW;

The fourth session creation response carries 5G IP2, and the fourth session creation response message Used to instruct the terminal to use the second IP address

S1008, after receiving the fourth session creation response, the SGW sends a second session creation response Create Session Response2 to the MME;

The second session creation response carries 5G IP2, and the second session creation response message is used to indicate that the terminal uses the second IP address.

The foregoing describes the solution of the embodiment of the present invention mainly from the perspective of interaction between the network elements. It can be understood that each network element, such as the first core network device, the second core network device, and the like, in order to implement the above functions, includes corresponding hardware structures and/or software modules for performing the respective functions. Those skilled in the art will readily appreciate that the present invention can be implemented in a combination of hardware or hardware and computer software in combination with the elements and algorithm steps of the various examples described in the embodiments disclosed herein. Whether a function is implemented in hardware or computer software to drive hardware depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The embodiments of the present invention may perform functional unit division on the first core network device, the first core network device, and the like according to the foregoing method. For example, each functional unit may be divided according to each function, or two or more functions may be used. Integrated in one processing unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit. It should be noted that the division of the unit in the embodiment of the present invention is schematic, and is only a logical function division, and the actual implementation may have another division manner.

In the case of employing an integrated unit, FIG. 11A shows a possible structural diagram of the first core network device involved in the above embodiment. The first core network device 1100 includes a processing unit 1102 and a communication unit 1103. The processing unit 1102 is configured to control and control the action of the first core network device. For example, the processing unit 1002 is configured to support the first core network device to perform steps S403, S404, S407, S408, S412, and S414 in FIG. 4, FIG. Steps S507, S508, steps S603, S604, S606, S607, S608, S610, S612 in Fig. 6, S705 in Fig. 7, steps S803-S805 in Fig. 8, S901, S903 in Fig. 9, Step S1001 in 10, S4a03, S4a04, S4a05, S4a07 in Fig. 4a, steps S4b03, S4b04, S4b05, S4b07, S4b012 in Fig. 4b, Steps S4c03, S4c04, S4c05, S4c07 in Fig. 4c, steps S4d03, S4d04, S4d05, S4d07 in Fig. 4d, steps S5a07, S5a11, S5a15 in Fig. 5a, steps S6a03, S6a04, S6a05, S6a07 in Fig. 6a, Steps S6b03, S6b04, S6b05, S6b07, S6b12 in Fig. 6b, S7a05, S7a09, S7a13 in the step of Fig. 7a, S7b05, S7b09 in the step of Fig. 7b and/or other processes for the techniques described herein. The communication unit 1103 is for supporting communication between the first core network device and other network entities, such as communication with the eNB, SGW, etc. shown in FIG. The first core network device may further include a storage unit 1101 for storing program codes and data of the MME.

The processing unit 1102 may be a processor or a controller, and may be, for example, a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication unit 1103 may be a communication interface, a transceiver, a transceiver circuit, or the like. The communication interface is a generic name and may include one or more interfaces. For example, the communication interface may include an interface between the MME and the SGW, and an interface between the MME and the eNB. / or other interface. The storage unit 1101 may be a memory.

When the processing unit 1102 is a processor, the communication unit 1103 is a communication interface, and the storage unit 1101 is a memory, the MME according to the embodiment of the present invention may be the MME shown in FIG. 11B.

Referring to FIG. 11B, the first core network device 1110 includes a processor 1112, a communication interface 1113, and a memory 1111. Optionally, the first core network device 1110 may further include a bus 1114. The communication interface 1113, the processor 1112, and the memory 1111 may be connected to each other through a bus 1114. The bus 1114 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on. The bus 1114 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in FIG. 11B, but it does not mean that there is only one bus or one type of bus.

The first core network device shown in FIG. 11A or FIG. 11B can also be understood as a device for the first core network device, which is not limited in the embodiment of the present invention.

In the case of employing an integrated unit, FIG. 12A shows a possible structural diagram of the second core network device involved in the above embodiment. The second core network device 1200 includes a processing unit 1202 and a communication unit 1203. The processing unit 1202 is configured to perform control management on the action of the second core network device. For example, the processing unit 1202 is configured to support the second core network device to perform steps S402, S405, S409, and S415 in FIG. 4, and step S602 in FIG. , S605, S613, steps S802, S807 in FIG. 8, steps S4a02, S4a08 in FIG. 4a, steps S4b02, S4b08, S4b13 in FIG. 4b, steps S4c02, S4c08 in FIG. 4c, step S4d02 in FIG. 4d, S4d08, steps S6a02, S6a08 in Fig. 6a, steps S6b02, S6b13, S6b14 in Fig. 6b and/or other processes for the techniques described herein. The communication unit 1203 is configured to support communication between the second core network device and other network entities, such as communication with the NG RAN entity, the UP Function entity, and the like shown in FIG. The second core network device may further include a storage unit 1201 for storing program codes and data of the second core network device.

The processing unit 1202 may be a processor or a controller, such as a central processing unit (CPU), a general-purpose processor, a digital signal processor (DSP), and an application-specific integrated circuit (Application-Specific). Integrated Circuit (ASIC), Field Programmable Gate Array (FPGA) or other programmable logic device, transistor logic device, hardware component, or any combination thereof. It is possible to implement or carry out the various illustrative logical blocks, modules and circuits described in connection with the present disclosure. The processor may also be a combination of computing functions, for example, including one or more microprocessor combinations, a combination of a DSP and a microprocessor, and the like. The communication unit 1203 may be a communication interface, a transceiver, a transceiver circuit, etc., wherein the communication interface is a collective name, and may include one or more interfaces, for example, may include: an interface between a CP Function entity and an NG RAN entity, and a CP Function entity and Interfaces and/or other interfaces between UP Function entities. The storage unit 1201 may be a memory.

When the processing unit 1202 is a processor, the communication unit 1203 is a communication interface, and the storage unit 1201 is a memory, the second core network device according to the embodiment of the present invention may be the second core network device shown in FIG. 12B.

Referring to FIG. 12B, the second core network device 1210 includes a processor 1212, a communication interface 1213, and a memory 1211. Optionally, the second core network device 1210 may further include a bus 1214. The communication interface 1213, the processor 1212, and the memory 1211 may be connected to each other through a bus 1214. The bus 1214 may be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (abbreviated). EISA) bus and so on. The bus 1214 can be divided into an address bus, a data bus, a control bus, and the like. For ease of representation, only one thick line is shown in Figure 12B, but it does not mean that there is only one bus or one type of bus.

The second core network device shown in FIG. 12A or FIG. 12B can also be understood as a device for the CP Function entity, which is not limited in the embodiment of the present invention.

In addition, the embodiment of the present invention also provides the following device: a first gateway, a second gateway, a first access network device, a second access network device, a first policy device, a second policy device, and an application function device, The terminal, the third core network device, the fourth core network device, and the like, and the structure of the network element is similar to the structure of the first core network device or the second core network device, which is not described in detail in the embodiment of the present invention.

The steps of the method or algorithm described in the embodiments of the present invention may be implemented in a hardware manner, or may be implemented by a processor executing software instructions. The software instructions may be composed of corresponding software modules, which may be stored in a random access memory (RAM), a flash memory, a read only memory (ROM), an erasable programmable read only memory ( Erasable Programmable ROM (EPROM), electrically erasable programmable read only memory (EEPROM), registers, hard disk, removable hard disk, compact disk read only (CD-ROM) or any other form of storage medium known in the art. An exemplary storage medium is coupled to the processor to enable the processor to read information from, and write information to, the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an ASIC. Additionally, the ASIC can be located in a gateway device or mobility management network element. Of course, the processor and the storage medium may also exist as discrete components in the gateway device or the mobility management network element.

Those skilled in the art will appreciate that in one or more of the above examples, the present invention The functions described in the embodiments can be implemented in hardware, software, firmware, or any combination thereof. When implemented in software, the functions may be stored in a computer readable medium or transmitted as one or more instructions or code on a computer readable medium. Computer readable media includes both computer storage media and communication media including any medium that facilitates transfer of a computer program from one location to another. A storage medium may be any available media that can be accessed by a general purpose or special purpose computer.

The specific embodiments of the present invention have been described in detail with reference to the embodiments of the embodiments of the present invention. The scope of the present invention is defined by the scope of the present invention. Any modifications, equivalents, improvements, etc., which are included in the embodiments of the present invention, are included in the scope of the present invention.

Claims (38)

A switching method, comprising: The first core network device receives a first handover request from the second core network device, where the first handover request carries a first internet protocol IP address and an address of a third core network device, the first IP address and the third The address of the core network device is used to establish a first access point name APN, where the first core network device is applied to the first standard network, and the second core network device and the third core network device are applied. In the second mode network, the first IP address is an IP address allocated by the second standard network to the terminal; The first core network device is configured to initiate the establishment of the first APN in the first standard network by the terminal; The first core network device sends a second handover request to the access network device, where the access network device is applied to the first standard network; Receiving, by the first core network device, a response message of the second handover request from the access network device; The first core network device sends a response message of the first handover request to the second core network device. The method according to claim 1, wherein the first core network device is configured to initiate the establishment of the first APN in the first standard network, and the method includes: The first core network device sends a first create session request message to the first gateway, where the first create session request message carries the first IP address and an address of the third core network device; The first core network device receives a first create session response message from the first gateway, where the first create session response message is used to indicate that the terminal uses the first IP address. The method according to claim 1 or 2, wherein the first handover request further carries indication information, where the indication information is used to indicate that the first core network device completes the establishment process of the first APN Sending a first notification message to the second core network device, where the method further includes: The first core network device sends the first notification message to the second core network device, where the first notification message is used to notify the second core network device: the first core network device is based on the The first IP address establishes the first APN for the terminal. The method according to claim 3, wherein before the sending, by the first core network device, the second handover request to the first access network device, the method further includes: Receiving, by the first core network device, a bearer creation request message from the first gateway; The first core network device sends a bearer creation response message to the first gateway. The method according to claim 1, wherein the first core network device, after the terminal initiates the process of establishing the first APN in the first-standard network, the method further includes: The first core network device is a process for the terminal to initiate a second APN in the first standard network. The method according to claim 5, wherein the first handover request further carries a second IP address and an address of a fourth core network device, the second IP address and an address of the fourth core network device And a process for establishing the second APN, where the second IP address is an IP address allocated by the second standard network to the terminal, and the fourth core network device is applied to the second standard network. The first core network device is configured to initiate a second APN in the first standard network, where the terminal includes: The first core network device sends a second create session request message to the first gateway, where the second create session request message carries the second IP address and the address of the fourth core network device; The first core network device receives a second create session response message from the first gateway, where the second create session response message is used to indicate that the terminal uses the second IP address. The method according to any one of claims 1 to 6, wherein the response message of the first handover request carries at least one of the following: an attach accept message, a packet data network PDN connection setup accept message or a session management SM Request message. The method according to any one of claims 1 to 7, wherein the first handover request further carries at least one of: an international mobile subscriber identity IMSI of the terminal, a security context of the terminal, a mobility management context of the terminal, a session management class context of the terminal, or terminal network capability information of the terminal in the first standard network. The method according to claim 1 or 3 or 5 or 7 or 8, wherein after the first core network device sends a response message of the first handover request to the second core network device, The method also includes: Receiving, by the first core network device, a bearer creation request message from the first gateway; Receiving, by the first core network device, a completion message of switching to the first standard network from the access network device; Transmitting, by the first core network device, a bearer setup request message to the access network device; Receiving, by the first core network device, a bearer setup response message from the access network device; The first core network device sends a bearer creation response message to the first gateway. The method according to claim 9, wherein after the first core network device receives the completion message of switching to the first-standard network from the access network device, the method further includes: Transmitting, by the first core network device, a handover completion notification message to the second core network device; The first core network device receives a handover complete confirmation message from the second core network device. A switching method, comprising: The second core network device receives a handover request message from the access network device, where the second core network device and the access network device are applied to the second standard network; Transmitting, by the second core network device, a first handover request to the first core network device, where the first handover request carries a first internet protocol IP address and an address of a third core network device, the first IP address and the The address of the third core network device is used to establish a first access point name APN of the terminal in the first standard network, where the first core network device is applied to the first standard network, and the third core The network device is applied to the second standard network, and the first IP address is an IP address allocated by the second standard network to the terminal; Receiving, by the second core network device, a response message of the first handover request from the first core network device; The second core network device sends a handover request response message to the access network device. The method according to claim 11, wherein the first handover request further carries indication information, where the indication information is used to indicate that the first core network device completes the establishment process of the first APN The second core network device sends a first notification message, and after the second core network device sends the first handover request to the first core network device, the method further includes: Receiving, by the second core network device, the first notification message from the first core network device, where The first notification message is used to notify the second core network device that the first core network device establishes the first APN for the terminal based on the first IP address. The method according to claim 12, wherein after the second core network device receives the first notification message from the first core network device, the method further includes: The second core network device sends a third notification message to the second policy device, where the third notification message is used to notify the second policy device: the first core network device is based on the first IP address The terminal establishes the first APN, where the second policy device is applied to the second standard network. The method according to claim 11 or 12, wherein the first handover request further carries a second IP address and an address of a fourth core network device, the second IP address and the fourth core network device The address is used in the process of establishing the second APN of the terminal in the first standard network, where the fourth core network device is applied to the second standard network, and the second IP address is the The IP address assigned by the two-standard network to the terminal. The method according to claim 14, wherein after the second core network device sends the first handover request to the first core network device, the method further includes: The second core network device receives a second notification message from the first core network device, where the second notification message is used to notify the second core network device: the first core network device is based on the second The IP address establishes the second APN for the terminal. The method according to any one of claims 11 to 15, wherein the first handover request further carries at least one of: an international mobile subscriber identity IMSI of the terminal, a security context of the terminal, The mobility management context of the terminal, the session management class context of the terminal, or the terminal network capability information of the terminal in the first standard network. The method according to any one of claims 11 to 16, wherein the response message of the first handover request carries at least one of the following: an attach accept message, a packet data network PDN connection establishment accept message or a session management SM Request message. The method according to any one of claims 11 to 17, after the second core network device receives the response message of the first handover request from the first core network device, the method further includes: Sending, by the second core network device, a seventh notification message to the second policy device, where the seventh The notification message is used to notify the second policy device that the terminal switches from the second standard network to the first standard network. The method according to any one of claims 11 to 17, after the second core network device receives the response message of the first handover request from the first core network device, the method further includes: Sending, by the second core network device, a handover complete confirmation message to the first core network device; The second core network device sends a ninth notification message to the second policy device, where the ninth notification message is used to notify the second policy device: the terminal switches from the second standard network to the The first system network. A first core network device, comprising: a processing unit and a communication unit, The processing unit is configured to receive, by the communication unit, a first handover request from a second core network device, where the first handover request carries a first internet protocol IP address and an address of a third core network device, the first IP The address and the address of the third core network device are used in a process of establishing a first access point name APN, wherein the first core network device is applied to a first standard network, the second core network device, and the The third core network device is applied to the second standard network, where the first IP address is an IP address allocated by the second standard network to the terminal; and is used to initiate the terminal in the first standard network for the terminal a process of establishing a first APN; and for transmitting, by the communication unit, a second handover request to the access network device, wherein the access network device is applied to the first standard network; and for communicating by the communication Receiving, by the unit, a response message of the second handover request from the access network device; and a response message for transmitting, by the communication unit, the first handover request to the second core network device. The first core network device according to claim 20, wherein the processing unit is configured to: send, by the communication unit, a first create session request message to the first gateway, where the first create session request message is Carrying the first IP address and an address of the third core network device; and receiving, by the communication unit, a first create session response message from the first gateway, where the first create session response message is used to indicate The terminal uses the first IP address. The first core network device according to claim 20 or 21, wherein the first handover request further carries indication information, where the indication information is used to indicate that the first core network device completes the first APN Sending a first notification message to the second core network device, the processing unit is further configured to send the first to the second core network device by using the communication unit a notification message, the first notification message is used to notify the second core network device that the first core network device establishes the first APN for the terminal based on the first IP address. The first core network device according to claim 22, wherein the processing unit is further configured to receive, by the communication unit, a bearer creation request message from the first gateway; and to use the communication unit to The first gateway sends a bearer creation response message. The first core network device according to claim 20, wherein the processing unit is further configured to initiate a process of establishing a second APN in the first standard network for the terminal. The first core network device according to claim 24, wherein the first handover request further carries a second IP address and an address of a fourth core network device, the second IP address and the fourth core The address of the network device is used in the process of establishing the second APN, where the second IP address is an IP address allocated by the second standard network to the terminal, and the fourth core network device is applied to the a second standard network, the processing unit is configured to: send, by the communication unit, a second create session request message to the first gateway, where the second create session request message carries the second IP address and the fourth An address of the core network device; and receiving, by the communication unit, a second create session response message from the first gateway, the second create session response message being used to instruct the terminal to use the second IP address. The first core network device according to any one of claims 20 to 25, wherein the response message of the first handover request carries at least one of the following: an attach accept message, a packet data network PDN connection establishment accept message Or session management SM request message. The first core network device according to any one of claims 20 to 26, wherein the first handover request further carries at least one of: an international mobile subscriber identity IMSI of the terminal, the terminal Security context, mobility management context of the terminal, session management class context of the terminal, or terminal network capability information of the terminal in the first system network. The first core network device according to claim 20 or 22 or 24 or 26 or 27, wherein the processing unit sends a response message of the first handover request to the second core network device by using the communication unit And thereafter, receiving, by the communication unit, a bearer creation request message from the first gateway; and receiving, by the communication unit, a completion message of switching from the access network device to the first-standard network; and Sending, by the communication unit, a bearer setup to the access network device And a message for receiving a bearer setup response message from the access network device by the communication unit; and for transmitting, by the communication unit, a bearer creation response message to the first gateway. The first core network device according to claim 28, wherein the processing unit receives the completion message for switching to the first-standard network from the access network device by using the communication unit, and is further used for Transmitting, by the communication unit, a handover complete notification message to the second core network device; and receiving, by the communication unit, a handover complete confirmation message from the second core network device. A second core network device, comprising: a processing unit and a communication unit, The processing unit is configured to receive, by the communication unit, a handover request message from an access network device, where the second core network device and the access network device are applied to a second system network; The communication unit sends a first handover request to the first core network device, where the first handover request carries a first internet protocol IP address and an address of a third core network device, the first IP address and the third core network device The address is used in the process of establishing a first access point name APN of the terminal in the first standard network, where the first core network device is applied to the first standard network, and the third core network device is applied to the a second standard network, where the first IP address is an IP address assigned by the second standard network to the terminal; and a first handover request is received by the communication unit from the first core network device And a response message to transmit a handover request response message to the access network device by the communication unit. The second core network device according to claim 30, wherein the first handover request further carries indication information, where the indication information is used to indicate that the first core network device completes establishment of the first APN Sending a first notification message to the second core network device after the process, the processing unit is further configured to receive, by the communication unit, the first notification message from the first core network device, the first notification message And the second core network device is configured to: the first core network device establishes the first APN for the terminal based on the first IP address. The second core network device according to claim 31, wherein the processing unit is further configured to send, by using the communication unit, a third notification message to the second policy device, where the third notification message is used to notify the The second policy device: the first core network device establishes the first APN for the terminal based on the first IP address, where the second policy device is applied to the second Standard network. The second core network device according to claim 30 or 31, wherein the first handover request further carries a second IP address and an address of a fourth core network device, the second IP address and the The address of the quad core network device is used to establish a second APN of the terminal in the first standard network, where the fourth core network device is applied to the second standard network, and the second IP address is An IP address assigned to the terminal by the second standard network. The second core network device according to claim 33, wherein the processing unit is further configured to receive, by the communication unit, a second notification message from the first core network device, where the second notification message is used The second core network device is notified: the first core network device establishes the second APN for the terminal based on the second IP address. The second core network device according to any one of claims 30 to 34, wherein the first handover request further carries at least one of: an international mobile subscriber identity IMSI of the terminal, the terminal The security context, the mobility management context of the terminal, the session management class context of the terminal, or the terminal network capability information of the terminal in the first mode network. The second core network device according to any one of claims 30 to 35, wherein the response message of the first handover request carries at least one of the following: an attach accept message, a packet data network PDN connection establishment accept message Or session management SM request message. The second core network device according to any one of claims 30 to 36, wherein the processing unit receives, by the communication unit, a response message of the first handover request from the first core network device, And a seventh notification message sent by the communication unit to the second policy device, where the seventh notification message is used to notify the second policy device: the terminal switches from the second standard network to the The first system network. The second core network device according to any one of claims 30 to 36, wherein the processing unit receives, by the communication unit, a response message of the first handover request from the first core network device, And is further configured to send, by using the communication unit, a handover complete confirmation message to the first core network device, and configured to send, by using the communication unit, a ninth notification message to the second policy device, where the ninth notification message is used by The second policy device is notified: the terminal switches from the second standard network to the first standard network.

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