WO2018141181A1 - Data transmission method and device - Google Patents

Abstract

Disclosed in the present disclosure are a data transmission method and device, wherein the method may comprise: a target base station receives a first message from a user equipment (UE) of an original base station, the first message carrying context information of the UE; and the target base station receives data sent by the UE in a preset state and sends the data to a core network, the preset state referring to a state in which an interface between the UE and the base station is disconnected and the interface between the base station and the core network remains connected. The present application enables a UE to transmit a data packet in a preset state, which not only facilitates adapting to the mobility of the UE in a non-preset state, but also may meet the time delay requirements of a service.

Description

Data transmission method and device Technical field

The present disclosure relates to the field of wireless communication technologies, and in particular, to a data transmission method and apparatus.

Background technique

As shown in FIG. 1 , the Long Term Evolution (LTE) system is mainly composed of three devices: a user equipment (UE, User Equipment), a core network (CN, Core Network), and a base station (eNB, Evolved Node). B), wherein the Mobility Management Entity (MME) in the core network is mainly responsible for signaling transmission, and the Serving Gateway (S-GW, Serving Gateway) is mainly responsible for data transmission. The interface between the UE and the eNB is Uu, and the interface between the eNB and the core network is S1.

The protocol architecture of the UE, the eNB, and the MME is as shown in FIG. 2. For the UE, the protocol layer includes: Radio Resource Control (RRC), Packet Data Convergence Protocol (PDCP), and Radio Link Control ( RLC (Radio Link Control), Medium Access Control (MAC), and Physical Layer (Physical Layer) belong to the access layer (AS, Access Stratum), while the upper layer of the AS layer is the non-access stratum ( NAS, Non Access Stratum).

At present, ultra-reliable and ultra-low latency services (URLLC, Ultra Reliable & Low Latency Communication) can be widely used in real life, such as medical, transportation and so on. Since the application scenario of this service needs to guarantee a very high accuracy rate and update speed, the characteristics of this service determine that its data packets need to be delivered in time. Now, the requirement for the URLLC service is that the uplink and downlink user plane delay is 0.5 ms. The user plane delay refers to transmitting an application layer data packet or message from the wireless protocol layer to the peer wireless protocol layer through the wireless interface layer. time.

When the UE is in the connected state, the base station can meet the requirements through timely scheduling, a small transmission interval, or optimized user plane processing.

Summary of the invention

In order to solve the above technical problem, an embodiment of the present disclosure provides a data transmission method and apparatus.

In order to achieve the objectives of the present disclosure, the present disclosure provides a data transmission method, including:

Receiving a first message from the first base station, where the first message carries context information of the user equipment;

Sending an acknowledgement message to the first base station.

Optionally, the method further includes:

The acknowledgment message carries configuration parameters of the user equipment transmitting data at the base station.

Optionally, the method further includes:

Receiving data sent by the user equipment in a preset state, and sending the data to a core network; the preset state refers to an interface between the user equipment and the base station being disconnected and an interface between the base station and the core network Stay connected.

Optionally, the method further includes:

Receiving first identification information indicating that the user equipment context information is delivered.

Optionally, the context information of the user equipment includes at least one of the following: an identifier of the user equipment, user equipment capability information, user equipment service information, a public land mobile network identity identifier selected by the user equipment, and a tracking area code, and the user equipment. Reference signal configuration information, service configuration information of the user equipment.

Optionally, the method further includes:

And according to the context information of the user equipment, the mobility management entity selected by the user equipment applies to establish a connection for the user equipment service.

Optionally, the applying, according to the context information of the user equipment, to the mobility management entity to establish a connection for the user equipment service, includes:

Sending, by the mobility management entity selected by the user equipment, a request message, where the request message carries second identifier information for indicating establishment of the connection, according to the context information of the user equipment;

And receiving an acknowledgement message fed back by the mobility management entity, where the acknowledgement message carries at least a serving gateway side GPRS tunneling protocol, a tunnel terminal identifier, and a transport layer address for the user equipment service.

Optionally, the request message is a handover request or a path conversion request or a newly defined message.

Optionally, after the mobile management entity selected by the user equipment applies for establishing a connection for the user equipment service, the method further includes:

And transmitting, by using the connection, uplink data of the user equipment to a core network, or receiving downlink data sent to the user equipment from a core network.

Optionally, the method further comprises one of the following:

Applying to the mobility management entity to release all connections of the user equipment at the local base station;

Applying to the mobility management entity to release all connections of the user equipment and establishing a connection of the user equipment at the base station;

Applying to the mobility management entity to release all connections of the user equipment outside the base station.

Optionally, the applying to the mobility management entity to release all connections of the user equipment at the local base station includes:

Sending a request message to the mobility management entity, where the request message carries at least third identifier information for indicating release of all connections of the user equipment at the local base station.

Optionally, the applying to the mobility management entity to release all connections of the user equipment and establishing the connection of the user equipment at the local base station includes:

Sending a request message to the mobility management entity, where the request message carries at least fourth identifier information, where the fourth identifier information is used to instruct the mobility management entity to delete all connections previously established for the user equipment, and Establishing a connection of the user equipment at the base station.

Optionally, the applying to the mobility management entity to release all connections of the user equipment except the local base station includes:

Sending a request message to the mobility management entity, where the request message carries at least fifth identifier information, where the fifth identifier information is used to instruct the mobility management entity to delete all connections of the user equipment except the base station.

The present disclosure also provides a data transmission device, including:

a first receiving module, configured to receive a first message from the first base station, where the first message carries context information of the user equipment;

The first sending module is configured to send an acknowledgement message to the first base station.

Optionally, the device further includes:

The first transmission module is configured to receive data sent by the user equipment in a preset state, and send the data to a core network; where the preset state is that the interface between the user equipment and the base station is disconnected and the base station is The state of the connection with the interface between the core network.

Optionally, the device further includes:

The first establishing a connection module is configured to apply, according to the context information of the user equipment, to the mobility management entity selected by the user equipment to establish a connection for the user equipment service.

Optionally, the first establishing connection module is further configured to perform one of the following:

Applying to the mobility management entity to release all connections of the user equipment at the local base station;

Applying to the mobility management entity to release all connections of the user equipment and establishing a connection of the user equipment at the base station;

Applying to the mobility management entity to release all connections of the user equipment outside the base station.

The present disclosure also provides an apparatus for operating in wireless communication, including: a processor and a memory,

The processor is configured to:

Receiving a first message from a user equipment of the first base station, where the first message carries context information of the user equipment;

Sending an acknowledgment message to the first base station, where the acknowledgment message carries configuration parameters for the user equipment to transmit data at the base station,

Receiving data sent by the user equipment in a preset state, and sending the data to a core network; the preset state refers to an interface between the user equipment and the base station being disconnected and an interface between the base station and the core network Keep the state of the connection;

The memory is coupled to the processor.

The present disclosure also provides a computer program product comprising a computer readable medium comprising:

Receiving a code, configured to receive a first message from a user equipment of the first base station, where the first message carries context information of the user equipment;

Send a code that is set to send a confirmation message.

The present disclosure further provides a data transmission method, including:

Determining, by the user equipment, one or more second base stations that may transmit data in a preset state;

Sending context information of the user equipment to the one or more second base stations.

Optionally, the method further includes:

Receiving a measurement report reported by the user equipment;

Determining one or more of the second base stations based on the measurement report.

Optionally, the method further includes:

Receiving an acknowledgment message from the second base station, where the acknowledgment message carries configuration parameters of the user equipment transmitting data at the second base station.

Optionally, the method further includes:

Sending, to the user equipment, second base station information, where the second base station information includes an identifier of the one or more target base stations, where the user equipment transmits data in a preset state, and a configuration parameter of the transmission data.

The disclosure further provides a data transmission method, including:

After receiving the indication information that the user equipment sent by the target base station enters the connection state, releasing the context of the user equipment and notifying other target base stations to release the user equipment context message; or

After receiving the indication of releasing the user equipment context information sent by any one of the target base stations, releasing the context of the user equipment and notifying other target base stations to release the user equipment context message.

The present disclosure also provides a wireless communication device, including:

a determining module, configured to determine one or more second base stations that the user equipment may transmit data in a preset state;

And a second sending module, configured to send context information of the user equipment to the one or more second base stations.

The present disclosure provides a device that operates in wireless communication, including:

Processor, set to:

Determining, by the user equipment, one or more second base stations that may send data in a preset state;

Sending context information of the user equipment to the one or more second base stations.

A memory coupled to the processor.

The present disclosure also provides a computer program product comprising a computer readable medium comprising:

Determining a code, the setting is to determine one or more second base stations that the user equipment may transmit data in a preset state;

Transmitting a code, the setting to send context information of the user equipment to the one or more second base stations.

The present disclosure also provides a data transmission method, including:

Receiving, by the user equipment, an Xth message of the one or more second base stations sent by the first base station, where the Xth message carries an identifier of the second base station and a configuration parameter of the transmission data;

Sending, by the user equipment, data that needs to be sent to the one or more target base stations in a preset state;

The preset state refers to a state in which an interface between the user equipment and the base station is disconnected and an interface between the original base station and the core network is kept connected.

Optionally, the method further includes the user equipment receiving downlink data from the target base station.

The present disclosure further provides a data transmission apparatus, including:

a configuration module, configured to receive an Xth message of one or more second base stations sent by the first base station, where the Xth message carries an identifier of the second base station and a configuration parameter of the transmission data;

a second transmission module, configured to send data to be sent to the one or more target base stations in a preset state;

The preset state refers to a state in which an interface between the user equipment and the base station is disconnected and an interface between the original base station and the core network is kept connected.

The present disclosure further provides a user equipment, including: a processor, configured to:

Receiving an identifier of one or more target base stations and a configuration parameter of the transmission data sent by the base station;

Sending, to the preset state, data to be sent to the one or more target base stations;

The preset state refers to a state in which an interface between the user equipment and the base station is disconnected and an interface between the original base station and the core network remains connected.

A memory coupled to the processor.

The present disclosure also provides a computer program product comprising a computer readable medium comprising:

Receiving a code, configured to receive an identifier of one or more target base stations and a configuration parameter of the transmission data sent by the base station;

Sending a code, which is set to send data to be transmitted to the one or more target base stations in a preset state.

In still another aspect, an embodiment of the present application further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are executed to implement the data transmission method applied to a target base station.

In still another aspect, an embodiment of the present application further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are executed to implement the data transmission method applied to an original base station.

In a further aspect, the embodiment of the present application further provides a computer readable storage medium, where computer executable instructions are stored, and the computer executable instructions are implemented to implement the data transmission method applied to the UE.

In a further aspect, the embodiment of the present application further provides a computer readable storage medium, where computer executable instructions are stored, and the computer executable instructions are implemented to implement the data transmission method applied to the MME.

The data transmission method and device in the embodiment of the present disclosure determines the possible target base stations by the original base station and transmits the context information of the UE to the target base stations, and then the target base station applies for establishing multiple S1 connections to the core network based on the context information of the UE. Then, the S1 connection is used to transmit the data packet from the UE, and the data packet is sent to the core network by using the established S1 connection, so as to improve the transmission rate of the URLLC data packet sent by the UE in the inactive state in the core network, thereby facilitating adaptation. The mobility of the UE in the inactive state can meet the delay requirement of the URLLC service.

According to the data transmission method and apparatus in the embodiment of the present disclosure, after the data packet transmission from the UE is completed or after the UE determines the target base station, the target base station that the UE does not access may apply to the core network to release the corresponding S1 connection to avoid occupying the network. Resources.

This application is applicable to current and next generation wireless communication systems.

Other features and advantages of the present disclosure will be set forth in the description which follows. The objectives and other advantages of the present disclosure can be realized and obtained by the structure particularly pointed out in the appended claims.

DRAWINGS

The drawings are used to provide a further understanding of the technical solutions of the present disclosure, and constitute a part of the specification, and the embodiments of the present application are used to explain the technical solutions of the present disclosure, and do not constitute a limitation of the technical solutions of the present disclosure.

1 is a diagram of an LTE architecture in the related art;

2 is a schematic diagram of a protocol architecture of a UE, an eNB, and an MME in related art;

3 is a flowchart of a data transmission method applied to a target base station in the present application;

4 is a schematic structural diagram of a structure of a data transmission apparatus applied to a target base station in the present application;

5 is a flowchart of a data transmission method applied to an original base station in the present application;

6 is a schematic structural diagram of a structure of a data transmission apparatus applied to an original base station in the present application;

7 is a flowchart of a data transmission method applied to a UE in the present application;

8 is a schematic structural diagram of a structure of a data transmission apparatus applied to a UE in the present application;

9 is a flowchart of a data transmission method applied to an MME in the present application;

10 is a schematic structural diagram of a structure of a data transmission apparatus applied to an MME target base station in the present application;

FIG. 11 is a schematic flowchart of delivering UE context information in an embodiment of the present application;

FIG. 12 is a schematic flowchart of establishing an S1 connection in an embodiment of the present application;

FIG. 13 is a schematic flowchart of a data transmission process in an embodiment of the present application.

detailed description

The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. It should be noted that, in the case of no conflict, the features in the embodiments and the embodiments in the present application may be arbitrarily combined with each other.

The steps illustrated in the flowchart of the figures may be executed in a computer system such as a set of computer executable instructions. Also, although logical sequences are shown in the flowcharts, in some cases the steps shown or described may be performed in a different order than the ones described herein.

In the related art, when the UE is in an inactive state, the Uu null connection of the UE has been disconnected, and the connection of the S1 is still maintained. If the UE has a URLLC packet to be sent, the Uu air interface connection needs to be re-established, especially the UE needs to follow the traditional The process of initiating a random access procedure, then establishing an RRC connection, and transferring to a connected state, takes a long time to meet the low latency requirement of the URLLC. In summary, a transmission scheme capable of enabling a UE to send a URLLC data packet in an inactive state is needed, which is convenient for adapting the mobility of the UE in an inactive state and satisfying the delay requirement of the URLLC service.

As the non-orthogonal technology matures, the UE can send the uplink data packet in an unlicensed manner. When the UE is in the active state, if the UE has the URLLC data packet, the UE can directly send the data to the base station in an unauthorized manner. data pack. However, since the UE is mobile, in the inactive state, the UE can reselect the cell and send data to the newly selected cell. At this time, the newly selected cell does not have the information of the UE, and the UE data cannot be submitted to the core. network. On the other hand, if the newly selected cell finds the cell that the UE originally accesses by using the UE identifier carried by the uplink data, and submits the data of the UE to the originally accessed cell, it is time consuming and cannot meet the delay requirement of the URLLC service. . Alternatively, if the newly selected cell finds the UE context by using the UE identifier carried by the uplink data, and establishes the connection of the S1 for the UE, this process may be time consuming and cannot meet the delay requirement of the URLLC service. It can be seen that the related technologies cannot enable the UE to meet the delay requirement of the URLLC service in an inactive state.

This embodiment provides a data transmission method and apparatus, which can at least solve the above problems.

As shown in FIG. 3, this embodiment provides a data transmission method, including:

Step 301: The target base station receives a first message from a UE of the original base station, where the first message carries context information of the user equipment UE.

Step 302: The target base station receives the data sent by the UE in a preset state, and sends the data to the core network. The preset state refers to that the interface between the UE and the base station is disconnected, and the base station and the core network are The interface between the two remains connected.

In the preset state, the preset state refers to a state in which an interface between the UE and the base station is disconnected, and an interface between the original base station and the core network remains connected; The target base station refers to a base station that the UE may access during the mobile process and the target base station is at least one.

In actual application, the context information of the UE may include: identifier of the UE, capability information, service information, selected PLMN ID and TAC, reference signal configuration information, and service configuration information.

In this embodiment, the target base station saves the UE context information, and sends an acknowledgement message to the original base station, where the acknowledgement message carries configuration parameters of the UE transmitting data at the target base station. The target base station is one or more base stations that the original base station may access during the mobile process according to the measurement report of the UE.

In some implementations, the target base station receives first identification information indicating that the UE context information is delivered. In this way, the target base station can identify and save the upper and lower information of the UE according to the first identification information.

In some implementations, after the target base station acquires the context information of the UE, the target base station may further apply to the core network to establish an S1 connection for the UE service according to the context information of the UE. Specifically, the target base station may send a request message to the MME that is previously selected by the UE according to the context information of the UE, where the request message is used to apply for establishing an S1 connection of the UE service, where the request message carries useful information. After the second identifier information of the S1 connection is established, the target base station receives an acknowledgement message fed back by the MME, where the acknowledgement message carries at least an S-GW side GPRS tunnel protocol-tunnel terminal for the UE service. The identifier (GTP-TEID) and the transport layer address.

In an actual application, the request message may be a handover request or a path conversion request or a newly defined message.

In some implementations, after the target base station applies for establishing the S1 connection for the UE service, the method may further include: the target base station sends the uplink data of the UE to the core network by using the S1 connection, or receives and sends the uplink data from the core network. Describe the downlink data of the UE.

Specifically, the target base station transmits data between the UE and the core network by using the S1 connection, including one or a combination of the following: 1) the target base station receives, from the UE, for the The uplink data packet of the UE service is sent to the core network according to the S-GW side GTP-TEID and the transport layer address of the UE service; 2) the target base station is based on the S- The GW side GTP-TEID and the transport layer address receive the downlink data packet from the core network and send it to the UE.

In some implementations, after the target base station applies to establish an S1 connection for the UE service, the target base station further includes one of the following:

1) The target base station applies to the MME to release all S1 connections of the UE at the local base station;

2) The target base station applies to the MME to release all S1 connections of the UE and establish an S1 connection of the UE at the base station;

3) The target base station applies to the MME to release all S1 connections of the UE outside the base station.

Specifically, the requesting the MME to release all the S1 connections of the UE in the local base station may include: the target base station sending a request message to the MME, where the request message is at least used to indicate that all UEs are released. The third identity information of the connection is such that the MME deletes all S1 connections established for the UE on the target base station after receiving the request message.

Specifically, the target base station requests the MME to release all the S1 connections of the UE and establish an S1 connection of the other services of the UE, where the target base station sends a request message carrying the fourth identifier information to the MME, so that the MME Deleting all the S1 connections previously established for the UE and re-establishing the S1 connection of the UE other services at the target base station after receiving the request message; wherein the fourth identifier information is used to indicate all S1s established before the release connection.

Specifically, the target base station requests the MME to release all the S1 connections of the UE other than the target base station, and the method includes: the target base station sends a request message carrying the fifth identifier information to the MME, so that the MME receives the request. After the message, all the S1 connections previously established for the UE except the current base station S1 connection are deleted; wherein the fifth identification information is used to indicate that all S1 connections of the UE except the current base station S1 connection are released.

Correspondingly, as shown in FIG. 4, the embodiment further provides a data transmission apparatus, which is applied to a target base station, and includes:

The first receiving module 40 is configured to receive a first message from the original base station, where the first message carries context information of the UE and/or first identifier information used to indicate that the current message is used to deliver a context;

The first transmission module 41 is configured to receive data sent by the UE in a preset state, and send the data to a core network; where the preset state is that the interface between the UE and the base station is disconnected, and the base station is The interface between the core networks remains connected.

In addition, the above data transmission device may further include:

a saving module 42, configured to save context information of the UE,

The first sending module 43 is configured to send an acknowledgment message to the original base station, where the acknowledgment message carries configuration parameters of the UE transmitting data at the target base station.

In some implementations, the data transmission apparatus may further include: a first connection establishing module 44, configured to apply to the core network to establish an S1 connection for the UE service according to the context information of the UE.

In some implementations, the first connection establishing module 44 may be further configured to: 1) apply to the MME selected by the UE to release all S1 connections of the UE at the current base station; 2) The MME applies for releasing all S1 connections of the UE and establishing an S1 connection of other services of the UE; and 3) applying to the MME to release all S1 connections of the UE except the target base station.

It should be noted that, in the embodiment, the data transmission apparatus shown in FIG. 4 can implement all the details of the data transmission method shown in FIG. 3, and details are not described herein.

As shown in FIG. 5, this embodiment further provides another method for data transmission, including:

Step 501: The original base station determines, according to the measurement report reported by the UE, that the UE may access one or more target base stations;

Step 502: The original base station sends the context information of the UE to the one or more target base stations.

The one or more target base stations are used by the UE to transmit data in a preset state, where the preset state is that the interface between the UE and the base station is disconnected, and the original base station and the core network are The interface between the ports remains connected.

In some implementations, the original base station receives an acknowledgment message from the target base station, where the acknowledgment message carries configuration parameters of the UE transmitting data at the target base station; and the original base station identifies the target base station And the configuration parameter of the transmission data is sent to the UE.

In an actual application, the original base station may send the first message to the target base station by using an X2 interface.

In some implementations, when the target base station is multiple, the original base station releases the context of the UE and notifies other target base stations after acquiring the indication information that the UE sends the connection state sent by any one of the target base stations. Release the UE context message; or, after receiving the indication of releasing the UE context information sent by any one of the target base stations, the original base station releases the context of the UE and notifies other target base stations to release the UE context. Message.

Correspondingly, the embodiment further provides another data transmission device, which is applied to the original base station, as shown in FIG. 6, and may include:

a determining module 61, configured to determine, according to the measurement report reported by the UE, that the UE may access one or more target base stations;

The second sending module 62 is configured to send context information of the UE to the one or more target base stations.

It should be noted that, in the embodiment, the data transmission apparatus shown in FIG. 6 can implement all the details of the data transmission method shown in FIG. 5, and details are not described herein again.

As shown in FIG. 7, this embodiment further provides another method for data transmission, including:

Step 701: The UE receives an identifier of one or more target base stations and configuration parameters of the transmission data sent by the base station.

Step 702: The UE sends a data packet that needs to be sent to the target base station in a preset state.

The preset state refers to a state in which an interface between the UE and the base station is disconnected and an interface between the original base station and the core network remains connected.

As shown in FIG. 8, the embodiment further provides another data transmission apparatus, which is applied to the UE, and includes:

The configuration module 81 is configured to receive, by the configuration module, an identifier of one or more target base stations and a configuration parameter of the transmission data sent by the base station;

a second transmission module 82, configured to send, to the target base station, a data packet that needs to be sent in a preset state;

The preset state refers to a state in which an interface between the UE and the base station is disconnected and an interface between the original base station and the core network remains connected.

It should be noted that, in the embodiment, the data transmission apparatus shown in FIG. 8 can implement all the details of the data transmission method shown in FIG. 7, and details are not described herein again.

As shown in FIG. 9, this embodiment further provides another method for data transmission, including:

Step 901: The MME receives a request message from the at least one target base station, where the request message is used to apply for establishing an S1 connection of the UE service, where the request message carries second identifier information for indicating establishment of an S1 connection.

Step 902: The MME establishes an S1 connection for the UE service for the at least one target base station according to the request message, and notifies the S-GW to bind the S1 connection of the at least one target base station to the a packet data network PDN connection corresponding to the UE service;

Step 903: The MME receives an acknowledgment message returned by the S-GW, where the acknowledgment message carries an S-GW side GTP-TEID and a transport layer address of the UE service.

Step 904: The MME sends an acknowledgment message to the at least one target base station, where the acknowledgment message carries the S-GW side GTP-TEID and the transport layer address of the UE service.

In the preset state, the preset state refers to a state in which an interface between the UE and the base station is disconnected, and an interface between the original base station and the core network remains connected; The target base station refers to a base station that the UE may access during the mobile process.

In some implementations, after establishing the S1 connection, the foregoing method may further include one of the following:

1) The MME receives a request message from the target base station, where the request message carries at least third identifier information for indicating that all S1 connections of the UE are released; and deleting all S1s established for the UE on the target base station. Connecting, and notifying the S-GW to update the binding of the corresponding S1 connection to the PDN corresponding to the UE service;

2) The MME receives a request message from the target base station, where the request message carries at least the fourth identification information, deletes all S1 connections previously established for the UE, and re-establishes other services of the UE at the target base station S1. Connecting, and notifying the S-GW to update the binding of the corresponding S1 connection to the PDN of the UE service; wherein the fourth identifier information is used to indicate that all S1 connections established before the release are performed;

3) The MME receives a request message from the target base station, where the request message carries at least the fifth identification information, deletes all S1 connections previously established for the UE except the current base station S1 connection, and notifies the The S-GW updates the binding of the corresponding S1 connection to the PDN of the UE service, where the fifth identifier information is used to indicate that all S1 connections of the UE except the current base station S1 are released.

Correspondingly, this embodiment further provides another data transmission apparatus, which is applied to the MME, as shown in FIG. 10, and includes:

The second connection establishing module 1001 is configured to receive a request message from the at least one target base station, where the request message is used to apply for establishing an S1 connection of the UE service, where the request message carries a second identifier for indicating establishment of an S1 connection. Information; and configured to establish, according to the request message, an S1 connection for the UE service, respectively, for the at least one target base station;

The notification module 1002 is configured to notify the S-GW to bind the S1 connection of the at least one target base station to a packet data network PDN connection corresponding to the UE service;

The third receiving module 1003 is configured to receive an acknowledgment message returned by the S-GW, where the acknowledgment message carries an S-GW side GTP-TEID and a transport layer address of the UE service.

The third sending module 1004 is configured to send an acknowledgment message to the at least one target base station, where the acknowledgment message carries an S-GW side GTP-TEID and a transport layer address of the UE service;

In the preset state, the preset state refers to a state in which an interface between the UE and the base station is disconnected, and an interface between the original base station and the core network remains connected; The target base station refers to a base station that the UE may access during the mobile process.

It should be noted that, in the embodiment, the data transmission apparatus shown in FIG. 10 can implement all the details of the data transmission method shown in FIG. 9, and details are not described herein again.

In a practical application, the target base station in the present embodiment refers to one or more base stations that the UE may access due to the mobile, and the target base station may be based on the original base station of the UE. The measurement report of the UE is determined.

In this embodiment, the original base station transmits the context information of the UE to the target base station, and then the target base station applies for establishing multiple S1 connections to the core network based on the context information of the UE, and then uses the S1 connection to transmit the data packet from the UE, and the The established S1 connection sends the data packet to the core network to improve the transmission rate of the URLLC data packet sent by the UE in the inactive state in the core network, thereby facilitating the mobility of the UE in the inactive state and satisfying the URLLC service. Delay requirements.

The present application will be described in detail below by way of specific examples. It is assumed that the UE is in a preset state. In the preset state, the Uu port of the UE is disconnected and the S1 port remains connected.

Example 1

In order to reduce the delay of the target base station acquiring the UE context, the UE context may be stored on multiple base stations.

The original base station can determine, according to the measurement report reported by the UE, the base station to which the UE may move, that is, the target base station. For example, the original base station considers that the UE may move to the target base station when the signal strength of the measurement target base station is higher than a certain threshold according to the measurement report reported by the UE. At this time, the context information of the UE may be transmitted to the target base stations by the original base station.

As shown in FIG. 11, the process in which the original base station transmits the context information of the UE to the target base station may include:

Step 1101: The original base station sends a first message to the target base stations of the UE (through an interaction interface between the base stations, such as an X2 interface), where the first message may carry the first identifier information indicating that the current message is used to deliver the context, and the UE Contextual information;

In an actual application, the first message may be a handover request (HANDOVER REQUEST) or a newly defined message. If the message itself includes the context information of the UE, it may carry only the first identifier information indicating that the current message is used to deliver the context. If the message itself does not include the context information of the UE, the first identifier information and the context information of the UE may be carried. . In this way, the original base station can transmit the context information of the UE to the target base stations by using the first message.

The context information of the UE may include one of the following or any combination thereof: the identifier of the UE (for example, resume ID and Serving Temporary Mobile Subscriber Identity), capability information, and service information (for example: Quality of Service (QOS), ERAB ID, etc.), Public Land Mobile Network (PLMN) identity (ID) and Tracking area code (TAC), UE reference Signal, and service configuration information (such as data radio bearer (DRB) configuration parameters of the service).

Step 1102: The target base stations of the UE receive the first message from the original base station, obtain the context information of the UE from the UE and save the information, establish a corresponding context for the UE, and feed back an acknowledgement message to the original base station.

In practical applications, the above confirmation message may be a handover request acknowledgement (HANDOVER REQUEST ACKNOWLEDGE) or a newly defined message.

Example 2

To ensure that the data packets of the service are transmitted to the core network in time, multiple S1 connections can be established for one service.

A plurality of possible target base stations can establish an S1 connection for the service of the UE.

As shown in FIG. 12, the process of establishing an S1 connection may include:

Step 1201: The multiple target base stations respectively request to establish multiple S1 connections to the MME selected by the UE.

Specifically, the multiple target base stations respectively find the MME selected by the UE according to the PLMN ID and TAC selected by the UE, and then request the MME to establish an S1 connection for the service.

The target base station may apply to establish an S1 connection by sending a request message to the MME, where the request message carries the second identifier information for establishing the S1 connection. In an actual application, the request message may be a HANDOVER REQUIRE, a PATH SWITCH REQUEST, or a newly defined message between the base station and the MME.

In addition, the foregoing request message may further carry an evolved radio access bearer (ERAB) information (such as ERAB ID) for the service, and a GPRS tunnel protocol-tunnel terminal identifier (GTP-TEID, GPRS of the target base station). Tunnelling Protocol-Tunnel Endpoint Identifier) and transport layer address.

Step 1202: The MME requests binding from the S-GW.

Specifically, after receiving the request message that the multiple target base stations apply to establish an S1 connection, the MME confirms that the UE has established an S1 connection of the service according to the UE identifier and the ERAB information, and accepts the request, respectively, in the multiple targets. An S1 connection of the service is established on the base station, and the S-GW is notified to have multiple S1 connections corresponding to one service, where the notification carries the ERAB ID of the service, the GTP-TEID of the target base station, and the transport layer address.

Step 1203: The S-GW confirms the binding to the MME.

Specifically, after receiving the foregoing notification from the MME, the S-GW binds the PDN connection corresponding to the service to all the S1 connections of the service, and returns an acknowledgement message to the MME, where the acknowledgement message carries the The S-GW side GTP-TEID and transport layer address of the service.

In step 1204, the MME returns an acknowledgement message to multiple target base stations.

Specifically, the MME returns an acknowledgment message to the target base station, and carries the S-GW side GTP-TEID and the transport layer address of the service, and thus, multiple S1 connection establishments corresponding to the multiple target base stations are completed, and each of the targets is completed. The base station can directly transmit data by using the corresponding S1 connection, so that each service data packet of the UE can be transmitted to the core network in time.

When an uplink data packet arrives in a certain service of the UE, any one of the plurality of target base stations may be selected, and an uplink data packet is sent to the target base station, where the target base station receives the uplink data packet and connects through the foregoing S1. Sended to the S-GW, the S-GW receives the uplink data packet and submits it to a corresponding Packet Data Network (PDN).

When a certain service of the UE has a downlink data packet, the S-GW may copy the downlink data packet to multiple S1 connections corresponding to the service, and the target base station corresponding to the multiple S1 connections is transmitted to the target base station. Said UE.

This embodiment can be performed simultaneously for multiple services of the UE, and can also be applied to different types of services of the UE.

Example 3

To ensure that the base station can transmit the data packets of the UE to the core network in a preset state, the S1 connection of the UE can be established in multiple cells.

As shown in FIG. 13, the process of establishing an S1 connection for a UE in multiple cells may include:

Step 1301: The UE reports the measurement report to the original base station.

Step 1302: Perform UE context transfer between the original base station and the target base station.

The original base station transmits the context information of the UE to the possible target base station according to the measurement report.

Specifically, the original base station may measure the signal strength of each target base station according to the measurement report reported by the UE. When the signal strength of some target base stations is higher than a certain threshold, the UE may be considered to move to the target base stations. The original base station sends the first message to the target base station through the X2 interface, and delivers the context of the UE to the target base station, where the first message may carry the first identifier information and the UE context information indicating that the current message is used to deliver the context;

In an actual application, the first message may be a handover request (HANDOVER REQUEST) or a newly defined message. If the message itself includes the context information of the UE, it may carry only the first identifier information indicating that the current message is used to deliver the context. If the message itself does not include the context information of the UE, the first identifier information and the context information of the UE may be carried. . In this way, the original base station can transmit the context information of the UE to the target base stations by using the first message.

The context information of the UE may include one of the following or any combination thereof: the identifier of the UE (for example, resume ID and Serving Temporary Mobile Subscriber Identity), capability information, and service information (for example: Quality of Service (Qos, ERAB ID, etc.), Public Land Mobile Network (PLMN) ID and Tracking area code (TAC) selected by the UE, reference signals of the UE, and services Configuration information (such as the data radio bearer (DRB) configuration parameters of the service).

Step 1303: Each target base station applies to the MME to establish an S1 connection.

Specifically, the multiple target base stations respectively find the MME selected by the UE according to the PLMN ID and the TAC selected by the UE, and then apply to the MME for the S1 connection that supports the transmission service in the preset state, and carry the ERAB ID of the service. The GTP-TEID and transport layer address of the target base station.

Step 1304: The MME applies for binding to the S-GW.

Specifically, the MME confirms that the UE has established the S1 connection of the service according to the UE identifier and the ERAB information, and then applies to the S-GW to bind the multiple S1 connections to one PDN connection, and carries the ERAB ID of the service. The GTP-TEID and transport layer address of the target base station.

Step 1305: The S-GW confirms the binding to the MME.

Specifically, the S-GW binds the PDN connection corresponding to the service to the new S1 connection and returns an acknowledgement message to the MME, and carries the S-GW side GTP-TEID and the transport layer address of the service.

Step 1306: The MME returns an acknowledgement message to the target base station, and carries the S-GW side GTP-TEID and the transport layer address of the service.

Step 1307: Each target base station generates a configuration parameter that the UE transmits data through the target base station according to the S-GW side GTP-TEID and the transport layer address of the service in the acknowledgement message, and feeds back an acknowledgement message to the original base station, where The acknowledgment message carries configuration parameters of the UE transmitting data at the target base station.

Step 1308: The original base station completes the configuration of the UE.

Specifically, the original base station sends a message to the UE, where the message carries the identifiers of the target base stations that the UE transmits data in the preset state, and the configuration parameters of the UE transmitting data in the target base stations. In an actual application, the message may be: an RRC Connection Reconfiguration message (RRCConnectionReconfiguration), an RRC Connection Release message (RRCConnectionRelease), or a newly defined message.

After the original base station completes the configuration of the UE, the UE may utilize multiple target base stations to perform data packet transmission. Specifically, when a certain service of the UE has an uplink data packet, any one or more target base stations of the multiple target base stations may be selected, and uplink data packets are sent to and received by the target base station. The uplink data packet is then sent to the S-GW through the S1 connection, and the S-GW receives the uplink data packet and submits it to a corresponding Packet Data Network (PDN). When a certain service of the UE has a downlink data packet, the S-GW may copy the downlink data packet to multiple S1 connections corresponding to the service, and the target base station corresponding to the multiple S1 connections is transmitted to the target base station. Said UE.

This embodiment can be performed simultaneously for multiple services of the UE, and can also be applied to different types of services of the UE.

For the implementation details of the steps 1303 to 1306 in this embodiment, refer to the related description in the second embodiment.

Example 4

After the S1 connection is established by each target base station, after confirming that the UE does not need to use these S1 connections (for example, when the UE satisfies the condition of entering the connected state from the preset state) or after accessing the target base stations (for example, UE access) When the base station other than the target base station is used, the corresponding S1 connection can be released to avoid occupying network resources.

Specifically, when the UE is in the preset state, the target base station is re-accessed. If the UE meets the condition of entering the connected state from the preset state, the target base station needs to indicate to the original base station that the UE enters the connected state at the target base station.

The target base station can restore the connected state of the UE, because the target base station stores the context information of the UE. Therefore, the target base station may indicate that the original base station UE enters the connected state at the target base station by using the UE context release procedure. In this way, the original base station may initiate a process of releasing the UE context, and the original base station initiates a process of releasing the UE context to other target base stations.

After the other target base stations may have an S1 connection of the UE, the other target base station needs to apply to the MME to release the S1 connection corresponding to itself after receiving the UE context release message sent by the original base station. Specifically, the other target base station may send a request message by using an interface between the base station and the core network, such as an S1 interface, where the request message carries third identifier information for indicating all S1 connections of the UE. In an actual application, the request message may specifically be an E-RAB RELEASE INDICATION or a newly defined message. The request message may also carry a UE identifier and ERAB information.

Receiving, by the MME, the request message from the target base station, and confirming, according to the UE identifier and the ERAB information, whether the corresponding UE has established multiple S1 connections of the service, and if yes, deleting the S1 of the service established on the target base station And connecting the S-GW to delete the S1 connection of the service on the target base station, and the S-GW unbinds the S1 connection from the PDN corresponding to the service. So far, the release of the S1 connection on each target base station is completed.

In a practical application, the condition that the UE meets the state of entering the connection state from the preset state may be determined by the following two methods: 1) the target base station detects that the UE meets the condition; and 2) the UE reports the application to the target base station to enter the connection state (for example, RRCConnectionResumeRequest).

Example 5

After the S1 connection is established by each target base station, after confirming that the UE does not need to use these S1 connections (for example, when the UE satisfies the condition of entering the connected state from the preset state) or after accessing the target base stations (for example, UE access) When the base station other than the target base station is used, the corresponding S1 connection can be released to avoid occupying network resources.

Specifically, when the UE is in the preset state, the target base station is re-accessed. If the UE meets the condition of entering the connection state from the preset state, the target base station needs to establish only the S1 connection of the UE part service, and the target base station needs to be established. S1 connection for other services.

At this time, when the S1 connection of the other service is established, all the S1 connections established before the UE may be deleted, and then the S1 connection of the UE to the connected state and the S1 connection of the target base station may be re-established. Specifically, the target base station notifies the MME by sending a request message carrying the fourth identification information, after the MME receives all the S1 connections established for the UE and re-establishes the S1 connection of the UE to the target base station after receiving the request message, At the same time, the S-GW is notified that all the S1 connections previously established for the UE are unbound with the PDN corresponding to the service, and the newly established S1 connection is bound to the PDN corresponding to the service. The fourth identifier information is used to indicate all the S1 connections established before the release. The request message may specifically be a PATH SWITCH REQUEST, or a newly defined message.

Alternatively, when establishing an S1 connection of other services, all S1 connections of the UE outside the target base station may be deleted. Specifically, the target base station notifies the MME by sending a request message carrying the fifth identifier information, and after receiving the request message, the MME deletes all the S1 connections previously established for the UE except the current base station S1 connection. The S-GW is notified that all S1 connections previously established for the UE except the current base station S1 are unbounded by the S-GW. The fifth identifier information is used to indicate that all S1 connections of the UE except the current base station S1 are released. The request message may specifically be a PATH SWITCH REQUEST, or a newly defined message.

In a practical application, the condition that the UE meets the state of entering the connection state from the preset state may be determined by the following two methods: 1) the target base station detects that the UE meets the condition; and 2) the UE reports the application to the target base station to enter the connection state (for example, RRCConnectionResumeRequest).

In addition, the embodiment further provides another data transmission apparatus, including: a processor and a memory, the transmission apparatus is applied to a target base station, the memory stores computer executable instructions, and the computer executable instructions are processed by the The following methods are implemented when the device is executed:

Receiving a first message of the UE from the original base station, where the first message carries context information of the user equipment UE;

Receiving data sent by the UE in a preset state, and sending the data to a core network; the preset state means that an interface between the UE and the base station is disconnected, and an interface between the base station and the core network is kept connected. status.

In addition, the embodiment further provides another data transmission apparatus, including: a processor and a memory, the transmission apparatus is applied to an original base station, the memory stores computer executable instructions, and the computer executable instructions are processed by the The following methods are implemented when the device is executed:

Determining that the UE may access one or more target base stations according to the measurement report reported by the UE;

Sending context information of the UE to the one or more target base stations.

In addition, the embodiment further provides another data transmission apparatus, including: a processor and a memory, the transmission apparatus is applied to a UE, the memory stores computer executable instructions, and the computer executable instructions are used by the processor The following methods are implemented during execution:

Receiving an identifier of one or more target base stations and a configuration parameter of the transmission data sent by the base station;

Sending, in a preset state, a data packet that needs to be sent to the target base station;

The preset state refers to a state in which an interface between the UE and the base station is disconnected and an interface between the original base station and the core network is kept connected.

In addition, the embodiment of the present application further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are implemented to implement the data transmission method applied to a target base station.

In addition, an embodiment of the present application further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are implemented to implement the data transmission method applied to an original base station.

In addition, the embodiment of the present application further provides a computer readable storage medium, where computer executable instructions are stored, and the computer executable instructions are implemented to implement the data transmission method applied to the UE.

In addition, the embodiment of the present application further provides a computer readable storage medium storing computer executable instructions, where the computer executable instructions are implemented to implement the data transmission method applied to the MME.

Optionally, in this embodiment, the foregoing storage medium may include, but not limited to, a USB flash drive, a Read-Only Memory (ROM), a Random Access Memory (RAM), a mobile hard disk, and a magnetic memory. A variety of media that can store program code, such as a disc or a disc.

Optionally, in this embodiment, the processor performs the method steps of the foregoing embodiments according to the stored program code in the storage medium.

For example, the specific examples in this embodiment may refer to the examples described in the foregoing embodiments and the optional embodiments, and details are not described herein again.

One of ordinary skill in the art will appreciate that all or a portion of the above steps may be performed by a program to instruct related hardware, such as a processor, which may be stored in a computer readable storage medium, such as a read only memory, disk or optical disk. Wait. Alternatively, all or part of the steps of the above embodiments may also be implemented using one or more integrated circuits. Correspondingly, each module/unit in the above embodiment may be implemented in the form of hardware, for example, by implementing an integrated circuit to implement its corresponding function, or may be implemented in the form of a software function module, for example, executing a program stored in the memory by a processor. / instruction to achieve its corresponding function. This application is not limited to any specific combination of hardware and software.

The basic principles and main features of the present application and the advantages of the present application are shown and described above. The present application is not limited by the above-described embodiments, and the above-described embodiments and the description are only for explaining the principles of the present application, and various changes and modifications may be made to the present application without departing from the spirit and scope of the application. And improvements are within the scope of the claimed invention.

Industrial applicability

The present disclosure is applicable to the field of wireless communication technologies, so that after the data packet transmission from the UE is completed or after the UE determines the target base station, the target base station that is not accessed by the UE may apply to the core network to release the corresponding S1 connection to avoid occupying the network. Resources.

Claims (32)

A data transmission method includes: Receiving a first message from the first base station, where the first message carries context information of the user equipment; Sending an acknowledgement message to the first base station. The data transmission method according to claim 1, further comprising: The acknowledgment message carries configuration parameters of the user equipment transmitting data at the base station. The data transmission method according to claim 1, further comprising: Receiving data sent by the user equipment in a preset state, and sending the data to a core network; the preset state refers to an interface between the user equipment and the base station being disconnected and an interface between the base station and the core network Stay connected. The data transmission method according to claim 1, further comprising: Receiving first identification information indicating that the context information of the user equipment is delivered. The data transmission method according to claim 1, wherein the context information of the user equipment comprises at least one of the following: an identifier of the user equipment, user equipment capability information, user equipment service information, and a public land mobile network identity selected by the user equipment. The identification and tracking area code, the reference signal configuration information of the user equipment, and the service configuration information of the user equipment. The data transmission method according to claim 1, further comprising: And according to the context information of the user equipment, the mobility management entity selected by the user equipment applies to establish a connection for the user equipment service. The data transmission method according to claim 6, wherein the requesting, by the mobile management entity, to establish a connection for the user equipment service according to the context information of the user equipment, includes: Sending, by the mobility management entity selected by the user equipment, a request message, where the request message carries second identifier information for indicating establishment of the connection, according to the context information of the user equipment; And receiving an acknowledgement message fed back by the mobility management entity, where the acknowledgement message carries at least a serving gateway side GPRS tunneling protocol, a tunnel terminal identifier, and a transport layer address for the user equipment service. The data transmission method according to claim 7, wherein the request message is a handover request or a path conversion request or a newly defined message. The data transmission method according to claim 6, after the mobile management entity selected by the user equipment applies for establishing a connection for the user equipment service, the method further includes: And transmitting, by using the connection, uplink data of the user equipment to a core network, or receiving downlink data sent to the user equipment from a core network. The data transmission method according to claim 6, further comprising one of the following: Applying to the mobility management entity to release all connections of the user equipment at the local base station; Applying to the mobility management entity to release all connections of the user equipment and establishing a connection of the user equipment at the base station; Applying to the mobility management entity to release all connections of the user equipment outside the base station. The data transmission method according to claim 10, wherein the applying to the mobility management entity to release all connections of the user equipment at the local base station includes: Sending a request message to the mobility management entity, where the request message carries at least third identifier information for indicating release of all connections of the user equipment at the local base station. The data transmission method according to claim 10, wherein the requesting the mobile management entity to release all connections of the user equipment and establishing the connection of the user equipment at the base station comprises: Sending a request message to the mobility management entity, where the request message carries at least fourth identifier information, where the fourth identifier information is used to instruct the mobility management entity to delete all connections previously established for the user equipment, and Establishing a connection of the user equipment at the base station. The data transmission method according to claim 10, wherein the applying to the mobility management entity to release all connections of the user equipment except the base station comprises: Sending a request message to the mobility management entity, where the request message carries at least fifth identifier information, where the fifth identifier information is used to instruct the mobility management entity to delete all connections of the user equipment except the base station. A data transmission device comprising: a first receiving module, configured to receive a first message from the first base station, where the first message carries context information of the user equipment; The first sending module is configured to send an acknowledgement message to the first base station. The data transmission device of claim 14, further comprising: The first transmission module is configured to receive data sent by the user equipment in a preset state, and send the data to a core network; where the preset state is that the interface between the user equipment and the base station is disconnected and the base station is The state of the connection with the interface between the core network. The data transmission device of claim 14, further comprising: The first establishing a connection module is configured to apply, according to the context information of the user equipment, to the mobility management entity selected by the user equipment to establish a connection for the user equipment service. The data transmission device according to claim 16, wherein The first establishing connection module is further configured to perform one of the following: Applying to the mobility management entity to release all connections of the user equipment at the local base station; Applying to the mobility management entity to release all connections of the user equipment and establishing a connection of the user equipment at the base station; Applying to the mobility management entity to release all connections of the user equipment outside the base station. A device that operates in wireless communication, including: a processor and a memory, The processor is configured to: Receiving a first message from a user equipment of the first base station, where the first message carries context information of the user equipment; Sending an acknowledgment message to the first base station, where the acknowledgment message carries configuration parameters of the data transmitted by the user equipment at the base station, Receiving data sent by the user equipment in a preset state, and sending the data to a core network; the preset state refers to an interface between the user equipment and the base station being disconnected and an interface between the base station and the core network Keep the state of the connection; The memory is coupled to the processor. A computer program product comprising a computer readable medium comprising: Receiving a code, configured to receive a first message from a user equipment of the first base station, where the first message carries context information of the user equipment; Send a code that is set to send a confirmation message. A data transmission method includes: Determining, by the user equipment, one or more second base stations that may transmit data in a preset state; Sending context information of the user equipment to the one or more second base stations. The data transmission method according to claim 20, further comprising: Receiving a measurement report reported by the user equipment; Determining one or more of the second base stations based on the measurement report. The data transmission method according to claim 20, further comprising: Receiving an acknowledgment message from the second base station, where the acknowledgment message carries configuration parameters of the user equipment transmitting data at the second base station. The data transmission method according to claim 20, further comprising: Sending, to the user equipment, second base station information, where the second base station information includes an identifier of the one or more target base stations, where the user equipment transmits data in a preset state, and a configuration parameter of the transmission data. A data transmission method includes: After receiving the indication information that the user equipment sent by the target base station enters the connection state, releasing the context of the user equipment and notifying other target base stations to release the user equipment context message; or After receiving the indication of releasing the user equipment context information sent by any one of the target base stations, releasing the context of the user equipment and notifying other target base stations to release the user equipment context message. A wireless communication device comprising: a determining module, configured to determine one or more second base stations that the user equipment may transmit data in a preset state; And a second sending module, configured to send context information of the user equipment to the one or more second base stations. A device that operates in wireless communication, including: Processor, set to: Determining, by the user equipment, one or more second base stations that may send data in a preset state; Transmitting context information of the user equipment to the one or more second base stations; A memory coupled to the processor. A computer program product comprising a computer readable medium comprising: Determining a code, the setting being to determine one or more second base stations that the user equipment may transmit data in a preset state; Transmitting a code, the setting to send context information of the user equipment to the one or more second base stations. A data transmission method includes: Receiving, by the user equipment, an Xth message of the one or more second base stations sent by the first base station, where the Xth message carries an identifier of the second base station and a configuration parameter of the transmission data; Sending, by the user equipment, data that needs to be sent to the one or more target base stations in a preset state; The preset state refers to a state in which an interface between the user equipment and the base station is disconnected and an interface between the original base station and the core network is kept connected. The data transmission method according to claim 28, further comprising the user equipment receiving downlink data from the target base station. A data transmission device comprising: a configuration module, configured to receive an Xth message of one or more second base stations sent by the first base station, where the Xth message carries an identifier of the second base station and a configuration parameter of the transmission data; a second transmission module, configured to send data to be sent to the one or more target base stations in a preset state; The preset state refers to a state in which an interface between the user equipment and the base station is disconnected and an interface between the original base station and the core network is kept connected. A user equipment, comprising: a processor, configured to: Receiving an identifier of one or more target base stations and a configuration parameter of the transmission data sent by the base station; Sending, to the preset state, data to be sent to the one or more target base stations; The preset state refers to a state in which an interface between the user equipment and the base station is disconnected and an interface between the original base station and the core network remains connected. A memory coupled to the processor. A computer program product comprising a computer readable medium comprising: Receiving a code, configured to receive an identifier of one or more target base stations and a configuration parameter of the transmission data sent by the base station; Sending a code, which is set to send data to be transmitted to the one or more target base stations in a preset state.

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