WO2022073491A1

WO2022073491A1 - Handover method, apparatus, terminal device, network device, and storage medium

Info

Publication number: WO2022073491A1
Application number: PCT/CN2021/122733
Authority: WO
Inventors: 赵亚利
Original assignee: 大唐移动通信设备有限公司
Priority date: 2020-10-10
Filing date: 2021-10-09
Publication date: 2022-04-14
Also published as: CN114339925A; CN114339925B

Abstract

Embodiments of the present application provide a handover method, an apparatus, a terminal device, a network device, and a storage medium. The handover method comprises: sending a radio resource control (RRC) connection establishment request message to a target cell, the RRC connection establishment request message carrying first indication information, the first indication information being used for assisting the target cell in determining a source cell of a terminal device UE, and the UE being connected to at least one of the target cell and the source cell by means of a relay. For a scenario where handover is executed by the terminal device UE, the embodiments of the present application can ensure service continuity during handover.

Description

Switching method, device, terminal device, network device and storage medium

cross reference

This application cites Chinese Patent Application No. 2020110805708 filed on October 10, 2020 with the patent title of "Handover Method, Device, Terminal Device, Network Device and Storage Medium". This patent application is incorporated herein by reference in its entirety.

technical field

The present application relates to the field of communication technologies, and in particular, to a handover method, apparatus, terminal device, network device, and storage medium.

Background technique

For the traditional communication network, the handover decision is performed by the network device. However, after the introduction of the relay relay, since when the relay selection is performed may depend on the implementation of the terminal equipment (User Equipment, UE), after the introduction of the relay relay, the handover is likely to be initiated by the UE itself. When the handover is initiated by the UE itself, the service continuity during handover cannot be guaranteed.

SUMMARY OF THE INVENTION

Embodiments of the present application provide a handover method, apparatus, terminal device, network device, and storage medium, so as to solve the problem in the prior art that service continuity cannot be guaranteed when the terminal device UE performs the handover by itself.

In order to solve the above problems, specifically, the embodiments of the present application provide the following technical solutions:

In a first aspect, an embodiment of the present application provides a switching method, including:

Sending a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the terminal equipment UE;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.

Optionally, the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.

Optionally, the identity information of the UE includes any of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

Optionally, the source cell identity information of the UE includes any of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

Optionally, the switching method further includes:

Receive an RRC reconfiguration message sent by the target cell, where the RRC reconfiguration message is sent by the target cell to the source cell of the UE to request context information for the UE after receiving the RRC connection establishment request message The first request message is then generated according to the context information of the UE obtained from the source cell of the UE.

Optionally, the switching method further includes:

Receive an RRC reconfiguration message sent by the source cell, where the RRC reconfiguration message is sent by the target cell to the source cell of the UE to request context information for the UE after receiving the RRC connection establishment request message The first request message is then generated according to the context information of the UE obtained from the source cell of the UE and sent to the source cell through the inter-base station interface.

Optionally, the switching method further includes:

Send an RRC reconfiguration complete message to the target cell, so that the target cell sends second indication information to the source cell of the UE and sends third indication information to the core network; the second indication information is used to indicate the The source cell of the UE performs data forwarding; the third indication information is used to request the core network to perform route switching.

Optionally, the method further includes: judging the handover;

When switching from direct connection to non-direct connection is required, the judgment conditions corresponding to the judgment of switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the target relay in the indirect connection is higher than the first threshold;

The channel quality of the Uu interface of the target relay in the indirect connection is higher than the second threshold;

The channel quality of the Uu interface between the terminal device and the source cell is lower than the third threshold;

The number of consecutive HARQ negative acknowledgment NACKs of the Uu interface between the terminal equipment and the source cell is higher than the fourth threshold;

A radio link failure RLF occurs on the Uu interface between the terminal device and the source cell;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.

Optionally, the method further includes: judging the handover;

When switching from a non-direct connection to a direct connection needs to be performed, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the fifth threshold;

The channel quality of the source relay Uu interface is lower than the sixth threshold;

The channel quality of the Uu interface between the terminal equipment and the target cell is higher than the seventh threshold;

The terminal device receives fourth indication information sent by the source relay, where the fourth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgments NACKs on the direct communication interface between the terminal device and the source relay is higher than the eighth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the ninth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Optionally, the method further includes: judging the handover;

When switching from the first indirect connection to the second indirect connection is required, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the tenth threshold;

The channel quality of the source relay Uu interface is lower than the eleventh threshold;

The channel quality of the direct communication interface between the terminal device and the target relay is higher than the twelfth threshold;

The channel quality of the target relay Uu interface is higher than the thirteenth threshold;

The terminal device receives fifth indication information sent by the source relay, where the fifth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgment NACKs on the direct communication interface between the terminal device and the source relay is higher than the fourteenth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the fifteenth threshold;

RLF occurs on the source relay Uu interface;

Wherein, the non-direct connection refers to the connection established between the terminal device and the network through the relay device.

In a second aspect, an embodiment of the present application provides a switching method, including:

receiving a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the UE;

the identity information of the UE;

The source cell identification information of the UE.

Optionally, the identity information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

Optionally, the switching method further includes:

sending a first request message for requesting context information of the UE to the source cell of the UE;

Generate an RRC reconfiguration message according to the context information of the UE acquired from the source cell of the UE; and send the RRC reconfiguration message to the UE.

Optionally, the switching method further includes:

generating an RRC reconfiguration message according to the context information of the UE obtained from the source cell of the UE;

The RRC reconfiguration message is sent to the source cell of the UE through the inter-base station interface.

Optionally, the switching method further includes:

Receive the RRC reconfiguration complete message sent by the UE, send second indication information to the source cell of the UE and send third indication information to the core network; the second indication information is used to indicate the source cell of the UE data forwarding is performed; the third indication information is used to request the core network to perform route switching.

Optionally, after sending the second indication information to the source cell of the UE and sending the third indication information to the core network, the method further includes:

Send sixth indication information to the source cell of the UE; the sixth indication information is used to instruct the source cell of the UE to release the context information of the UE.

In a third aspect, an embodiment of the present application provides a switching device, including:

a sending module, configured to send a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the terminal equipment UE the source cell;

In a fourth aspect, an embodiment of the present application provides a switching device, including:

a receiving module, configured to receive a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the UE the source cell;

In a fifth aspect, an embodiment of the present application provides a terminal device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the following steps when executing the computer program:

Send a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the terminal equipment UE;

the identity information of the UE;

The source cell identification information of the UE.

Optionally, the identity information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

Optionally, when the processor executes the computer program, the processor is further configured to implement the following steps:

Optionally, when the processor executes the computer program, it is further configured to execute a judgment of switching;

The number of consecutive HARQ negative acknowledgments NACKs on the Uu interface between the terminal device and the source cell is higher than the fourth threshold;

RLF occurs on the source relay Uu interface;

Wherein, the direct connection refers to the connection established between the terminal equipment and the network equipment directly through the Uu interface; the non-direct connection refers to the connection established between the terminal equipment and the network through the relay equipment.

RLF occurs on the source relay Uu interface;

In a sixth aspect, an embodiment of the present application provides a target cell side network device, including a memory, a processor, and a computer program stored in the memory and running on the processor, where the processor implements the following when executing the computer program: step:

the identity information of the UE;

The source cell identification information of the UE.

Optionally, the identity information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

The RRC reconfiguration message is sent to the UE.

After sending the second indication information to the source cell of the UE and sending the third indication information to the core network, send sixth indication information to the source cell of the UE; the sixth indication information is used to indicate the UE's The source cell releases the context information of the UE.

In a seventh aspect, an embodiment of the present application further provides a processor-readable storage medium, where the processor-readable storage medium stores a computer program, and the computer program is configured to cause the processor to execute the first aspect as described above or the steps of the switching method described in the second aspect.

The handover method, device, terminal device, network device, and storage medium provided by the embodiments of the present application, when the terminal device UE needs to establish a connection with at least one of the target cell and the source cell through a relay, by sending radio resources to the target cell When controlling the RRC connection establishment request message, the RRC connection establishment request message carries the first indication information for assisting the target cell to determine the source cell of the UE, so that the target cell can use the first indication information carried in the RRC connection establishment request message Determine the source cell of the UE, so that when the UE performs the handover, it can ensure that the target cell can obtain the source cell information, so as to ensure the continuity of the service, and thus solve the problem that the service cannot be guaranteed when the UE performs the handover in the prior art. the question of continuity.

Description of drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the accompanying drawings used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description These are some embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without any creative effort.

1 is a schematic diagram of a communication mode of centralized network control provided by an embodiment of the present application;

2 is a schematic diagram of direct communication interface discovery/communication provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a UE-to-Network Relay provided by an embodiment of the present application;

FIG. 4 is a flowchart of steps of a switching method applied to a terminal device provided by an embodiment of the present application;

FIG. 5 is a flowchart of steps of a handover method applied to a network device on a target cell side provided by an embodiment of the present application;

FIG. 6 is one of the schematic flowcharts of the handover method provided by the embodiment of the present application;

FIG. 7 is the second schematic flowchart of the handover method provided by the embodiment of the present application;

FIG. 8 is a third schematic flowchart of a handover method provided by an embodiment of the present application;

9 is a block diagram of a module of a switching device applied to a terminal device provided by an embodiment of the present application;

10 is a block diagram of a module of a switching device applied to a network device on a target cell side provided by an embodiment of the present application;

FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of the present application;

FIG. 12 is a schematic structural diagram of a network device on a target cell side provided by an embodiment of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the scope of protection of this application.

It should be noted that there are mainly two existing communication modes, namely, a cellular network communication mode and a direct communication mode. The cellular network communication mode is shown in FIG. 1 , the traditional wireless communication usually adopts the cellular network communication mode, that is, the terminal and the network side equipment transmit uplink and downlink data/control information through the Uu interface. The direct communication mode is shown in FIG. 2 , and the direct communication refers to a mode in which adjacent terminals can transmit data through a direct communication link (also called a sidelink) within a short range. The wireless interface corresponding to the Sidelink link is called the direct communication interface (also called the Sidelink interface or the PC5 interface).

In order to expand the network coverage, a common solution is to introduce a relay (Relay). Relay can be a terminal with relay function. There are two situations in which Relay is introduced, one is UE-to-Network Relay and the other is UE-to-UE Relay.

For UE-to-Network Relay, see Figure 3, the interface between the Relay and the network uses the Uu interface, and the interface between the relayed UE (also called the remote UE) uses the direct communication interface. The link between the relay and the network may be called a backhaul link (BH) for the remote UE.

For UE-to-UE Relay, two relayed UEs can transmit data through the relay device. In order to simplify the description, the connection that the UE accesses the network through the relay is also called indirect connection (also called indirect connection); the connection that the UE directly accesses the network through the Uu interface is also called direct connection (also called direct connection).

It can be understood that, indirect (indirect) connection means that the UE accesses the network through a relay; direct (direct) means that the UE directly connects to the network through the Uu interface.

It should be noted that the bearer in the relay relay scenario is divided into three categories:

①Direct communication interface bearer: that is, the bearer between the remote UE and the relay UE;

②The end-to-end bearer between the remote UE and the network device: that is, the end-to-end bearer established between the remote end and the network device;

③ Bearer of the remote UE on the backhaul link of the Uu interface: that is, the bearer used to bear the data of the remote UE between the relay UE and the network device.

Regardless of the type of bearer, the bearer and the logical channel are in one-to-one correspondence, and the logical channel has a corresponding logical channel identifier.

As mentioned in the background section, for traditional communication networks, handover judgment is performed by network equipment. However, after the introduction of the relay relay, since the time to perform the relay selection may depend on the implementation of the terminal device (User Equipment, UE), after the introduction of the relay relay, the switching (such as between direct/indirect or indirect/direct or indirect/indirect handover) is likely to be initiated by the UE itself. When the handover is initiated by the UE itself, the service continuity during handover cannot be guaranteed. In order to solve this problem, the embodiments of the present application provide a switching method, apparatus, terminal device, network device, and storage medium. If the handover between links is determined, the RRC connection establishment request message sent by the UE to the target network device needs to carry the first indication information, and the first indication information is used to assist the target network device to determine the source cell of the UE, thereby So that the target cell can determine the source cell of the UE through the first indication information carried in the RRC connection establishment request message, so that when the UE performs handover by itself, it can be ensured that the target cell can obtain the source cell information, thereby ensuring service continuity. , thereby solving the problem in the prior art that service continuity cannot be guaranteed when the UE performs handover by itself. The handover method, device, terminal device, network device and storage medium provided by the present application will be explained and described in detail below through specific embodiments.

It should be noted that, in the following description, since the method and the device are conceived based on the same application, and the principles of the method and the device for solving problems are similar, the implementation of the device and the method can be referred to each other, and repeated descriptions will not be repeated.

In addition, it should be noted that the technical solutions provided in the embodiments of the present application may be applicable to various systems, such as a 5G system. For example, the applicable system may be a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) general packet Wireless service (general packet radio service, GPRS) system, long term evolution (long term evolution, LTE) system, LTE frequency division duplex (frequency division duplex, FDD) system, LTE time division duplex (time division duplex, TDD) system, Long term evolution advanced (LTE-A) system, universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) system, 5G New Radio (New Radio, NR) system, etc. These various systems include terminal equipment and network equipment. The system may also include a core network part, such as an evolved packet system (Evloved Packet System, EPS), a 5G system (5GS), and the like.

The terminal device involved in the embodiments of the present application may be a device that provides voice and/or data connectivity to a user, a handheld device with a wireless connection function, or other processing device connected to a wireless modem. In different systems, the name of the terminal device may be different. For example, in the 5G system, the terminal device may be called user equipment (User Equipment, UE). Wireless terminal equipment can communicate with one or more core networks (Core Network, CN) via a radio access network (Radio Access Network, RAN). "telephone) and computers with mobile terminal equipment, eg portable, pocket-sized, hand-held, computer-built or vehicle-mounted mobile devices, which exchange language and/or data with the radio access network. For example, Personal Communication Service (PCS) phones, cordless phones, Session Initiated Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (Personal Digital Assistants), PDA) and other devices. Wireless terminal equipment may also be referred to as system, subscriber unit, subscriber station, mobile station, mobile station, remote station, access point , a remote terminal device (remote terminal), an access terminal device (access terminal), a user terminal device (user terminal), a user agent (user agent), and a user device (user device), which are not limited in the embodiments of the present application. Since the terminal device and other network devices (eg, core network device, access network device (ie, base station)) together form a network that can support communication, in this embodiment of the present application, the terminal device is also regarded as a kind of network device.

The network device involved in the embodiments of the present application may be a base station, and the base station may include a plurality of cells providing services for the terminal, or may be a CU (Central Unit, centralized control unit) or a DU (Distributed Unit, distributed unit). Depending on the specific application, the network device may also be called an access point, or may be a device in the access network that communicates with wireless terminal devices through one or more sectors on the air interface, or other names. The network device can be used to exchange received air frames with Internet Protocol (IP) packets, and act as a router between the wireless terminal device and the rest of the access network, which can include the Internet. Protocol (IP) communication network. The network devices may also coordinate attribute management for the air interface. For example, the network device involved in the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in the Global System for Mobile Communications (GSM) or Code Division Multiple Access (Code Division Multiple Access, CDMA). ), it can also be a network device (NodeB) in Wide-band Code Division Multiple Access (WCDMA), or it can be an evolved network device in a long term evolution (LTE) system (evolutional Node B, eNB or e-NodeB), 5G base station (gNB) in 5G network architecture (next generation system), or Home evolved Node B (HeNB), relay node (relay node) , a home base station (femto), a pico base station (pico), etc., which are not limited in the embodiments of the present application. In some network structures, a network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be geographically separated.

In addition, it should be understood that the term "and/or" in the embodiments of the present application describes the association relationship of associated objects, and indicates that there may be three kinds of relationships, for example, A and/or B, which may indicate that A exists alone, and A and B exist simultaneously. B, there are three cases of B alone. The character "/" generally indicates that the associated objects are an "or" relationship.

Reference throughout the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Thus, appearances of "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily necessarily referring to the same embodiment. Furthermore, the particular features, structures or characteristics may be combined in any suitable manner in one or more embodiments.

The present application will be specifically described below.

As shown in FIG. 4 , a flowchart of steps of a handover method applied to a terminal device provided by an embodiment of the present application, the method includes the following steps:

Step 101: Send a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source of the terminal equipment UE community;

In this embodiment, in order to ensure the continuity of services when the UE performs handover by itself, this embodiment adopts the following technical means: when sending a radio resource control RRC (Radio Resource Control) connection establishment request message to the target cell , the RRC connection establishment request message carries the first indication information for assisting the target cell in determining the source cell of the UE, so that the target cell can determine the source cell of the UE through the first indication information carried in the RRC connection establishment request message, thereby To ensure business continuity.

In this embodiment, since the first indication information is indication information used to assist the target cell to determine the source cell of the UE, in an optional implementation manner, the content of the first indication information may be It includes at least one or more of the following information: ① identification information of the UE; ② identification information of the source cell of the UE. For example, in an implementation manner, the first indication information may only include the source cell identification information of the UE, and the target cell may determine the source cell of the UE according to the source cell identification information of the UE; in another In an implementation manner, the first indication information may include both the identity information of the UE and the source cell identity information of the UE, and the target cell can determine the source cell of the UE according to the source cell identity of the UE, and can determine whether the UE is a source cell. Which UE in the source cell.

In this embodiment, the identity information of the UE may be, but is not limited to, one of the following: ① the cell radio network temporary identifier C-RNTI (Cell-Radio Network Temporary Identifier) of the UE in the source cell; ② the 5G-S-TMSI of the UE Or part of 5G-S-TMSI.

In this embodiment, the source cell identifier of the UE may be, but is not limited to, one of the following: ① The cell global identifier CGI (Cell Global Identifier) of the source cell of the UE, for example, may include (PLMN ID+Cell ID) ; 2. the frequency point of the UE source cell and the physical cell identifier PCI (Physical Cell ID); 3. the PCI of the UE source cell.

In the handover method provided by the embodiment of the present application, when the UE needs to establish a connection with at least one of the target cell and the source cell through a relay, when the RRC connection establishment request message is sent to the target cell, the RRC connection establishment request message is sent to the target cell. The message carries the first indication information used to assist the target cell in determining the source cell of the UE, so that the target cell can determine the source cell of the UE through the first indication information carried in the RRC connection establishment request message, so that the UE can perform handover by itself At the time, it can be ensured that the target cell can obtain the source cell information, so as to ensure the continuity of the service, thereby solving the problem that the service continuity cannot be guaranteed when the UE performs handover in the prior art.

Based on the content of the foregoing embodiment, in this embodiment, the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.

In this embodiment, it should be noted that, in an implementation manner, the first indication information may include identification information of the UE; in another implementation manner, the first indication information may include all source cell identification information of the UE; in another implementation manner, the first indication information may include identification information of the UE and source cell identification information of the UE.

Based on the content of the foregoing embodiment, in this embodiment, the identification information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

In this embodiment, it should be noted that the identification information of the UE is used to uniquely identify the UE, so as to distinguish it from other UEs. In an implementation manner, the identification information of the UE may include the C-RNTI, a cell radio network temporary identification of the UE in the source cell; in another implementation manner, the identification information of the UE may include the UE 5G-S-TMSI; in another implementation manner, the identity information of the UE may include a part of information of the 5G-S-TMSI of the UE. It can be understood that the identification information of the UE may include a part of information of the 5G-S-TMSI of the UE, which means that the identification information of the UE may include the identification information that can be used to accurately identify the 5G-S-TMSI of the UE. A part of the information, for example, includes the 5G-TMSI identification part in the 5G-S-TMSI of the UE.

Based on the content of the foregoing embodiment, in this embodiment, the source cell identity information of the UE includes any of the following:

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

In this embodiment, the source cell identification information of the UE is used to uniquely identify the source cell of the UE, so as to distinguish it from other cells. In an implementation manner, the source cell identity information of the UE may include the cell global identity CGI of the source cell of the UE; in another implementation manner, the public land mobile network PLMN ( The combination of Public Land Mobile Network) and cell identity Cell Identity; in another implementation manner, the source cell identity information of the UE may include the frequency point of the UE source cell + the physical cell identity PCI; in yet another implementation In the method, the source cell identification information of the UE may include the PCI of the source cell of the UE.

Based on the content of the foregoing embodiment, in this embodiment, the switching method further includes:

In this embodiment, it should be noted that after receiving the first indication information, the target cell may perform the following processing: send a first request message to the source cell of the UE, where the first request message is used to request the UE The context information context, the target cell generates an RRC reconfiguration message according to the context of the UE obtained from the source cell, and sends it to the UE.

In this embodiment, different from the above-mentioned embodiments, this embodiment is to receive an RRC reconfiguration message sent by the source cell, and the RRC reconfiguration message is obtained by the target cell after receiving the RRC connection establishment request message. After sending the first request message for requesting the context information of the UE to the source cell of the UE, it is generated according to the context information of the UE obtained from the source cell of the UE and sent to the source cell through the inter-base station interface.

In this embodiment, it should be noted that, after receiving the RRC reconfiguration complete message sent by the UE, the target cell may also perform the following operations: send second indication information to the source cell to notify the source cell to perform data forwarding , and, after receiving the RRC reconfiguration complete message sent by the UE, send third indication information to the core network, which is used to request the core network route switch request (Path switch request) to request route switching.

In this embodiment, notifying the source cell to perform data forwarding refers to notifying the source cell to send the data locally stored in the source cell to the target cell after the handover is completed.

Based on the content of the foregoing embodiment, in this embodiment, before sending a radio resource control RRC connection establishment request message to the target cell, the handover method further includes: making a handover judgment;

When switching from direct connection to non-direct connection is required, the judgment condition corresponding to the judgment of switching includes any one or more of the following conditions:

In this embodiment, it can be understood that the switch from direct connection to indirect connection can be performed as long as one or more of the following conditions are satisfied: ①Direct communication between the terminal device and the target relay in the indirect connection The quality of the interface channel is higher than the first threshold; ②The channel quality of the Uu interface of the target relay in the indirect connection is higher than the second threshold; ③The channel quality of the Uu interface between the terminal equipment and the source cell is lower than the third threshold; ④The terminal equipment and the source cell The number of HARQ (Hybrid Automatic Repeat reQuest) negative acknowledgments of the Uu interface between the cells is higher than the fourth threshold; ⑤ RLF (RadioLinkFailure) occurs on the Uu interface between the terminal device and the source cell.

It should be noted that the values of the first threshold, the second threshold, the third threshold and the fourth threshold may be set according to actual needs, which are not limited in this embodiment.

Based on the content of the foregoing embodiment, in this embodiment, before sending a radio resource control RRC connection establishment request message to the target cell, the method further includes: making a handover judgment;

RLF occurs on the source relay Uu interface;

In this embodiment, it can be understood that switching from indirect connection to direct connection can be performed as long as one or more of the following conditions are met: ① The channel quality of the direct communication interface between the terminal device and the source relay is low 2) The channel quality of the Uu interface of the source relay is lower than the sixth threshold; 3) The channel quality of the Uu interface between the terminal device and the target cell is higher than the seventh threshold; 4) The terminal device receives the fourth threshold sent by the source relay. Indication information, the fourth indication information is used to indicate the release of the relay connection; The number of consecutive HARQ NACKs following the Uu interface is higher than the ninth threshold; ⑦ The direct communication interface between the terminal device and the source relay has a radio link failure RLF; ⑧ RLF occurs on the Uu interface of the source relay.

It should be noted that the values of the fifth threshold, the sixth threshold, the seventh threshold, the eighth threshold and the ninth threshold may be set according to actual needs, which are not limited in this embodiment.

RLF occurs on the source relay Uu interface;

In this embodiment, it can be understood that the switching from the first indirect connection to the second indirect connection can be performed as long as one or more of the following conditions are satisfied: ① Direct connection between the terminal device and the source relay The channel quality of the communication interface is lower than the tenth threshold; ②The channel quality of the Uu interface of the source relay is lower than the eleventh threshold; ③The channel quality of the direct communication interface between the terminal device and the target relay is higher than the twelfth threshold; After the channel quality of the Uu interface is higher than the thirteenth threshold; 5. The terminal device receives the fifth indication information sent by the source relay, and the fifth indication information is used to instruct the release of the relay connection; 6. Between the terminal device and the source relay The number of consecutive HARQ NACKs of HARQ negative acknowledgments on the direct communication interface of the direct communication interface is higher than the fourteenth threshold; ⑦ The number of consecutive HARQ NACKs on the Uu interface of the source relay is higher than the fifteenth threshold; Radio link failure RLF occurs on the communication interface; ⑨ RLF occurs on the source relay Uu interface.

It should be noted that the values of the tenth threshold, the eleventh threshold, the twelfth threshold, the thirteenth threshold, the fourteenth threshold, and the fifteenth threshold may be set according to actual needs, which are not limited in this embodiment. .

As shown in Figure 5, a flowchart of the steps of the handover method applied to the target cell network device side provided by the embodiment of the present application, the method includes the following steps:

Step 201: Receive a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell in determining the source of the UE community;

In the handover method provided by the embodiments of the present application, when the UE needs to establish a connection with at least one of the target cell and the source cell through a relay, the RRC connection establishment request message carrying the first indication information sent by the UE is received. Business continuity during handover can be guaranteed. This is because the first indication information is used to assist the target cell in determining the source cell of the UE, so the target cell can determine the source of the terminal equipment UE through the first indication information carried in the RRC connection establishment request message Therefore, when the UE performs the handover by itself, it can ensure that the target cell can obtain the source cell information, so as to ensure the continuity of the service, thereby solving the problem that the service continuity cannot be guaranteed when the handover is performed by the UE itself in the prior art. .

the identity information of the UE;

The source cell identification information of the UE.

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

In this embodiment, it should be noted that the identification information of the UE is used to uniquely identify the UE, so as to distinguish it from other UEs. In an implementation manner, the identification information of the UE may include the C-RNTI, a cell radio network temporary identification of the UE in the source cell; in another implementation manner, the identification information of the UE may include the UE 5G-S-TMSI; in another implementation manner, the identity information of the UE may include a part of information of the 5G-S-TMSI of the UE. It can be understood that the identification information of the UE may include a part of information of the 5G-S-TMSI of the UE, which means that the identification information of the UE may include the identification information that can be used to accurately identify the 5G-S-TMSI of the UE. A part of the information, for example, includes the 5G-TMSI identification part of the 5G-S-TMSI of the UE.

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

In this embodiment, the source cell identification information of the UE is used to uniquely identify the source cell of the UE, so as to distinguish it from other cells. In an implementation manner, the source cell identity information of the UE may include the cell global identity CGI of the source cell of the UE; the combination of the PLMN of the source cell of the UE and the cell identity Cell Identity; in another implementation In another implementation manner, the source cell identification information of the UE may include the frequency point + physical cell identification PCI of the UE source cell; in another implementation manner, the source cell identification information of the UE may include the UE source cell PCI.

Based on the content of the foregoing embodiments, in this embodiment, the switching method further includes:

In this embodiment, different from the above-mentioned embodiments, this embodiment sends the RRC reconfiguration message to the source cell of the UE through an interface between base stations.

Based on the content of the foregoing embodiment, in this embodiment, after sending the second indication information to the source cell of the UE and sending the third indication information to the core network, the method further includes:

In this embodiment, it should be noted that after the second indication information is sent to the source cell of the UE and the third indication information is sent to the core network, in order to improve the resource utilization rate of the source cell of the UE, the target cell sends the The source cell of the UE sends sixth indication information; the sixth indication information is used to instruct the source cell of the UE to release the context information of the UE.

The present application will be specifically described below through specific embodiments.

First embodiment:

As shown in FIG. 6 , in this embodiment, the switching process from direct to indirect is given, which specifically includes the following steps:

Step 1: The terminal performs relay selection.

In this step, it should be noted that the relay selection can reuse the existing mechanism, for example, the triggering condition for the terminal to perform the relay selection may be, but not limited to, that the channel quality of the terminal Uu interface meets the threshold requirement. When to perform relay selection after the threshold requirements are met may depend on the UE implementation. A new relay selection trigger condition can also be used, including but not limited to one or a combination of the following: a. The channel quality of the direct communication interface of the target Relay link is higher than the threshold; b. The quality of the Uu BH channel of the target Relay link is higher than the threshold; c. The channel quality of the Uu link is lower than the threshold; d. The number of consecutive HARQ NACKs on the Uu interface is higher than the threshold; e. RLF occurs on the Uu interface.

Step 2: Establish an RRC connection with the target cell via the relay.

In this step, the UE establishes an RRC connection with the target cell by relaying the UE. The RRC connection establishment request message sent by the UE to the target network device needs to carry first indication information, where the first indication information is used to assist the target network device to determine the source cell of the UE. Wherein, the identity information of the UE may be but not limited to one of the following: a. the C-RNTI of the UE in the source cell; b. the 5G-S-TMSI of the UE or a part of the 5G-S-TMSI; the The source cell identity of the UE may be, but is not limited to, one of the following: a, the cell global identity CGI (PLMN ID+Cell ID) of the source cell of the UE; b, the combination of the PLMN and the Cell Identity of the UE source cell; c, the frequency point of the UE source cell + PCI; d, the PCI of the UE source cell.

Step 3: The target cell sends a first request message to the source cell.

In this step, the behavior of the target cell after receiving the first indication information is as follows: the target cell of the UE receives the first indication information, and sends a first request message to the source cell of the UE, the first request message The context used to request the UE.

Step 4: The source cell sends a response message corresponding to the first request message to the target cell.

Step 5: The target cell sends an RRC reconfiguration message to the UE via the relay.

In this step, the target cell generates an RRC reconfiguration message according to the context of the UE obtained from the source cell, and sends it to the UE through the target cell.

Step 6: The UE sends an RRC reconfiguration complete message to the target cell via the relay.

Step 7: The target cell sends a second response message to the source cell.

In this step, after receiving the RRC reconfiguration complete message sent by the UE, the target cell sends second indication information to the source cell to notify the source cell to perform data forwarding.

Step 8: The target cell sends a route switching request message to the core network.

In this step, it should be noted that this step 8 and the above-mentioned step 7 do not have strict priority order. After receiving the RRC reconfiguration complete message sent by the UE, the target cell sends third indication information to the core network for requesting Core network route switch request (Path switch request), requesting route switch.

Step 9: Obtain the response message corresponding to Step 8.

Step 10: The target cell instructs the source cell to release the UE context.

Second embodiment:

As shown in FIG. 7 , in this embodiment, the switching process from indirect to direct is given, which specifically includes the following steps:

Step 1: The terminal performs an indirect/direct switching decision.

In this step, the terminal determines whether to perform indirect-to-direct switching, and the specific trigger conditions may be but not limited to one or a combination of the following: a. The channel quality of the direct communication interface of the source Relay link is lower than the threshold; b. The source Relay link The quality of the Uu BH channel is lower than the threshold; c. The channel quality of the Uu link is higher than the threshold; d. The UE receives the indication information sent by the source relay to indicate the release of the relay connection; e. The number of consecutive HARQ NACKs on the direct communication interface of the source relay link is higher than Threshold; f. The number of consecutive HARQ NACKs on the source relay link Uu BH is higher than the threshold; g, RLF occurs on the direct communication interface of the source relay link; h, RLF occurs on the source relay link Uu BH.

Step 2: Establish an RRC connection with the target cell via the Uu interface.

In this step, the UE establishes an RRC connection with the target cell through the Uu interface. The RRC connection establishment request message sent by the UE to the target network device needs to carry first indication information, where the first indication information is used to assist the target network device to determine the source cell of the UE. Wherein, the identity information of the UE may be but not limited to one of the following: a. the C-RNTI of the UE in the source cell; b. the 5G-S-TMSI of the UE or a part of the 5G-S-TMSI; the The source cell identity of the UE may be, but is not limited to, one of the following: a, the cell global identity CGI (PLMN ID+Cell ID) of the source cell of the UE; b, the combination of the PLMN and the Cell Identity of the UE source cell; c, the frequency point of the UE source cell + PCI; d, the PCI of the UE source cell.

Step 3: The target cell sends a first request message to the source cell.

In this step, the behavior of the target cell receiving the first indication information is as follows: the target cell of the UE receives the first indication information, and sends a first request message to the source cell of the UE, and the first request message uses The context information context for the requesting UE.

Step 5: The target cell sends an RRC reconfiguration message to the UE via the Uu interface.

Step 6: The UE sends an RRC reconfiguration complete message to the target cell via the Uu.

Step 7: The target cell sends a second response message to the source cell.

In this step, it should be noted that there is no strict priority order in steps 8 and 7. After receiving the RRC reconfiguration complete message sent by the UE, the target cell sends third indication information to the core network to request the core network Route switch request (Path switch request), request route switch.

Step 9: Obtain the response message corresponding to Step 8.

Step 10: The target cell instructs the source cell to release the UE context.

Third embodiment:

As shown in FIG. 8 , in this embodiment, the switching process from indirect to indirect is given, which specifically includes the following steps:

Step 1: The terminal performs an indirect/indirect switching decision.

In this step, the terminal determines whether to perform indirect-to-indirect switching, and the specific trigger conditions may be but not limited to one or a combination of the following: a. The channel quality of the direct communication interface of the source relay link is lower than the threshold; b. The source relay link The quality of the Uu BH channel is lower than the threshold; c. The channel quality of the direct communication interface of the target relay link is higher than the threshold; d, the quality of the Uu BH channel of the target relay link is higher than the threshold; e, the UE receives the indication information sent by the source relay to indicate the release relay connection. f. The number of consecutive HARQ NACKs on the direct communication interface of the source relay link is higher than the threshold; g. The number of consecutive HARQ NACKs on the source relay link Uu BH is higher than the threshold; h. RLF occurs on the direct communication interface of the source relay link; i. The source relay link Road Uu BH occurs RLF.

Step 2: Establish an RRC connection with the target cell via the target relay.

In this step, the UE establishes an RRC connection with the target cell through the target relay. The RRC connection establishment request message sent by the UE to the target network device needs to carry first indication information, where the first indication information is used to assist the target network device to determine the source cell of the UE. Wherein, the identity information of the UE may be but not limited to one of the following: a. the C-RNTI of the UE in the source cell; b. the 5G-S-TMSI of the UE or a part of the 5G-S-TMSI; the The source cell identity of the UE may be, but is not limited to, one of the following: a, the cell global identity CGI (PLMN ID+Cell ID) of the source cell of the UE; b, the combination of the PLMN and the Cell Identity of the UE source cell; c, the frequency point of the UE source cell + PCI; d, the PCI of the UE source cell.

Step 3: The target cell sends a first request message to the source cell.

Step 5: The target cell sends an RRC reconfiguration message to the UE via the target relay

Step 6: The UE sends an RRC reconfiguration complete message to the target cell via the target relay.

Step 7: The target cell sends a second response message to the source cell.

Step 9: Obtain the response message corresponding to Step 8.

Step 10: The target cell instructs the source cell to release the UE context.

According to the above description, when the UE performs the handover decision between direct and indirect links or between different indirect links, the RRC connection establishment request message sent by the UE to the target cell needs to carry the first indication information. The first indication information is used to assist the target cell in determining the source cell of the UE, so that the target cell can determine the source cell of the UE through the first indication information carried in the RRC connection establishment request message, thereby ensuring that the target cell can obtain the source cell. cell information, thereby ensuring service continuity, thereby solving the problem in the prior art that service continuity cannot be guaranteed when the UE performs handover by itself. It can be seen from this that the embodiment of the present application provides a processing method that can ensure service continuity during direct/indirect connection switching, and this processing method can ensure the radio link layer control protocol RLC (Radio Link Control) AM mode during switching. Data lossless.

In addition, as shown in FIG. 9 , it is a block diagram of a module of a switching apparatus applied to a terminal device in an embodiment of the present application, and the apparatus includes:

A sending module 11, configured to send a radio resource control RRC connection establishment request message to a target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine a terminal device the source cell of the UE;

In one embodiment, the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.

In one embodiment, the identity information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

In one embodiment, the source cell identity information of the UE includes any of the following:

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

In one embodiment, the switching device further includes:

The first receiving module is configured to receive an RRC reconfiguration message sent by the target cell, where the RRC reconfiguration message is used by the target cell to send to the source cell of the UE after receiving the RRC connection establishment request message. It is generated according to the context information of the UE obtained from the source cell of the UE after the first request message for requesting the context information of the UE.

In one embodiment, the switching device further includes:

The second receiving module is configured to receive an RRC reconfiguration message sent by the source cell, where the RRC reconfiguration message is a message sent by the target cell to the source cell of the UE after receiving the RRC connection establishment request message. After the first request message for requesting the context information of the UE, it is generated according to the context information of the UE obtained from the source cell of the UE and sent to the source cell through the inter-base station interface.

In one embodiment, the sending module 11 is further configured to:

In one embodiment, the switching device further includes a first judgment module for judging switching;

In one embodiment, the switching device further includes a second judging module for judging the switching;

The number of consecutive HARQ negative acknowledgment NACKs on the direct communication interface between the terminal device and the source relay is higher than the eighth threshold;

RLF occurs on the source relay Uu interface;

In one embodiment, the switching device further includes a third judging module for judging the switching;

RLF occurs on the source relay Uu interface;

It should be noted here that this apparatus can implement all the method steps of the embodiment of the handover method applied to the terminal device and can achieve the same technical effect, which will not be repeated here.

In addition, as shown in FIG. 10 , it is a module block diagram of a switching device applied to a target cell side network device in an embodiment of the present application, and the device includes:

A receiving module 21, configured to receive a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell in determining the the source cell of the UE;

the identity information of the UE;

The source cell identification information of the UE.

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

In one embodiment, the switching device further includes:

a first sending module, configured to send a first request message for requesting context information of the UE to the source cell of the UE;

In one embodiment, the switching device further includes:

a second sending module, configured to send a first request message for requesting context information of the UE to the source cell of the UE;

In one embodiment, the receiving module 21 is further configured to:

In one embodiment, the switching apparatus further includes a third sending module, configured to send the second indication information to the source cell of the UE and the third indication information to the core network, send the second indication information to the source cell of the UE and send the third indication information to the source cell of the UE. Send sixth indication information; the sixth indication information is used to instruct the source cell of the UE to release the context information of the UE.

It should be noted here that this apparatus can implement all the method steps of the embodiment of the handover method applied to the network device at the target cell side and can achieve the same technical effect, which will not be repeated here.

FIG. 11 is a schematic structural diagram of a terminal device provided by an embodiment of the present application, including a memory 1120 , a transceiver 1100 , and a processor 1110 .

11, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 1110 and various circuits of memory represented by memory 1120 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and, therefore, will not be described further herein. The bus interface provides the interface. Transceiver 1100 may be multiple elements, ie, including transmitters and receivers, providing means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like. The processor 1110 is responsible for managing the bus architecture and general processing, and the memory 1120 may store data used by the processor 1110 in performing operations.

The processor 1110 may be a central processor (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (Complex Programmable Logic Device). , CPLD), the processor can also use a multi-core architecture.

The memory 1120 is used to store computer programs; the transceiver 1100 is used to send and receive data under the control of the processor; the processor 1110 is used to read the computer programs in the memory and perform the following operations:

the identity information of the UE;

The source cell identification information of the UE.

Optionally, the identity information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

Optionally, the switching method further includes:

Judgment for switching;

When it is necessary to perform the handover that is directly connected to the non-direct connection, the judgment condition corresponding to the judgment of the described handover includes any one or more of the following conditions:

Optionally, the switching method further includes:

Judgment for switching;

A radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Optionally, the switching method further includes:

Judgment for switching;

RLF occurs on the source relay Uu interface;

Wherein, the indirect connection refers to the connection established between the terminal device and the network through the relay device.

It should be noted here that the terminal device provided in the embodiment of the present application can implement all the method steps of the embodiment of the handover method applied to the terminal device and can achieve the same technical effect, which is not repeated here.

FIG. 12 is a schematic structural diagram of a target cell side network device provided by an embodiment of the present application, including a memory 1220 , a transceiver 1200 , and a processor 1210 .

12, the bus architecture may include any number of interconnected buses and bridges, specifically one or more processors represented by processor 1210 and various circuits of memory represented by memory 1220 are linked together. The bus architecture may also link together various other circuits, such as peripherals, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides the interface. Transceiver 1200 may be a number of elements, including a transmitter and a receiver, that provide means for communicating with various other devices over transmission media including wireless channels, wired channels, fiber optic cables, and the like. The processor 1210 is responsible for managing the bus architecture and general processing, and the memory 1220 may store data used by the processor 1210 in performing operations.

The processor 1210 may be a central processor (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA) or a complex programmable logic device (Complex Programmable Logic Device). , CPLD), the processor can also use a multi-core architecture.

The memory 1220 is used to store computer programs; the transceiver 1200 is used to send and receive data under the control of the processor; the processor 1210 is used to read the computer programs in the memory and perform the following operations:

Based on the foregoing embodiments, in this embodiment, the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.

Optionally, the identity information of the UE includes any of the following:

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.

Based on the foregoing embodiments, in this embodiment, the source cell identity information of the UE includes any of the following:

The cell global identity CGI of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.

Optionally, the switching method further includes:

Based on the foregoing embodiments, in this embodiment, the switching method further includes:

Based on the foregoing embodiments, in this embodiment, after sending the second indication information to the source cell of the UE and sending the third indication information to the core network, the method further includes:

It should be noted here that the target cell side network device provided in this embodiment can implement all the method steps of the embodiment of the handover method applied to the target cell side network device and can achieve the same technical effect, which is not repeated here.

It should be noted that the division of units in the embodiments of the present application is illustrative, and is only a logical function division, and other division methods may be used in actual implementation. In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically alone, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware, or may be implemented in the form of software functional units.

If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it may be stored in a processor-readable storage medium. Based on this understanding, the technical solutions of the present application can be embodied in the form of software products in essence, or the parts that contribute to the prior art, or all or part of the technical solutions, and the computer software products are stored in a storage medium , including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to execute all or part of the steps of the methods described in the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, ROM), random access memory (Random Access Memory, RAM), magnetic disk or optical disk and other media that can store program codes .

It should be noted here that the above-mentioned device provided by the embodiment of the present application can realize all the method steps realized by the above-mentioned method embodiment, and can achieve the same technical effect, and the same as the method embodiment in this embodiment is not repeated here. The parts and beneficial effects will be described in detail.

On the other hand, an embodiment of the present application further provides a processor-readable storage medium, where a computer program is stored in the processor-readable storage medium, and the computer program is used to cause the processor to execute the processes described in the foregoing embodiments. Methods.

The processor-readable storage medium can be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (eg, floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (eg, CD, DVD, BD, HVD, etc.), and semiconductor memory (eg, ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state disk (SSD)), etc.

It can be seen from the above embodiments that the processor-readable storage medium stores a computer program, and the computer program is used to cause the processor to execute the steps of the above switching method.

As will be appreciated by those skilled in the art, the embodiments of the present application may be provided as a method, a system, or a computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein, including but not limited to disk storage, optical storage, and the like.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It will be understood that each flow and/or block in the flowcharts and/or block diagrams, and combinations of flows and/or blocks in the flowcharts and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to the processor of a general purpose computer, special purpose computer, embedded processor or other programmable data processing device to produce a machine such that the instructions executed by the processor of the computer or other programmable data processing device produce Means for implementing the functions specified in a flow or flow of a flowchart and/or a block or blocks of a block diagram.

These processor-executable instructions may also be stored in a processor-readable memory capable of directing a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory result in the manufacture of means comprising the instructions product, the instruction means implements the functions specified in the flow or flow of the flowchart and/or the block or blocks of the block diagram.

These processor-executable instructions can also be loaded onto a computer or other programmable data processing device to cause a series of operational steps to be performed on the computer or other programmable device to produce a computer-implemented process that Execution of the instructions provides steps for implementing the functions specified in the flowchart or blocks and/or the block or blocks of the block diagrams.

Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

A switching method, comprising:

Sending a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the terminal equipment UE;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.
The handover method according to claim 1, wherein the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.
The handover method according to claim 2, wherein the identification information of the UE includes any one of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.
The handover method according to claim 2, wherein the source cell identity information of the UE comprises any one of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.
The handover method according to claim 1, further comprising:

Receive an RRC reconfiguration message sent by the target cell, where the RRC reconfiguration message is sent by the target cell to the source cell of the UE to request context information for the UE after receiving the RRC connection establishment request message The first request message is then generated according to the context information of the UE obtained from the source cell of the UE.
The handover method according to claim 1, further comprising:

Receive an RRC reconfiguration message sent by the source cell, where the RRC reconfiguration message is sent by the target cell to the source cell of the UE to request context information for the UE after receiving the RRC connection establishment request message The first request message is then generated according to the context information of the UE obtained from the source cell of the UE and sent to the source cell through the inter-base station interface.
The handover method according to claim 5 or 6, further comprising:

Send an RRC reconfiguration complete message to the target cell, so that the target cell sends second indication information to the source cell of the UE and sends third indication information to the core network; the second indication information is used to indicate the The source cell of the UE performs data forwarding; the third indication information is used to request the core network to perform route switching.
The handover method according to claim 1, wherein the method further comprises: judging the handover;

When switching from direct connection to non-direct connection is required, the judgment condition corresponding to the judgment of switching includes any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the target relay in the indirect connection is higher than the first threshold;

The channel quality of the Uu interface of the target relay in the indirect connection is higher than the second threshold;

The channel quality of the Uu interface between the terminal device and the source cell is lower than the third threshold;

The number of consecutive HARQ negative acknowledgment NACKs of the Uu interface between the terminal equipment and the source cell is higher than the fourth threshold;

A radio link failure RLF occurs on the Uu interface between the terminal device and the source cell;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
The handover method according to claim 1, wherein the method further comprises: judging the handover;

When switching from a non-direct connection to a direct connection needs to be performed, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the fifth threshold;

The channel quality of the source relay Uu interface is lower than the sixth threshold;

The channel quality of the Uu interface between the terminal equipment and the target cell is higher than the seventh threshold;

The terminal device receives fourth indication information sent by the source relay, where the fourth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgments NACKs on the direct communication interface between the terminal device and the source relay is higher than the eighth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the ninth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
The handover method according to claim 1, wherein the method further comprises: judging the handover;

When switching from the first indirect connection to the second indirect connection is required, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the tenth threshold;

The channel quality of the source relay Uu interface is lower than the eleventh threshold;

The channel quality of the direct communication interface between the terminal device and the target relay is higher than the twelfth threshold;

The channel quality of the target relay Uu interface is higher than the thirteenth threshold;

The terminal device receives fifth indication information sent by the source relay, where the fifth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgment NACKs on the direct communication interface between the terminal device and the source relay is higher than the fourteenth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the fifteenth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Wherein, the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
A switching method, comprising:

receiving a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the UE;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.
The handover method according to claim 11, wherein the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.
The handover method according to claim 12, wherein the identification information of the UE includes any one of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.
The handover method according to claim 12, wherein the source cell identity information of the UE comprises any one of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.
The handover method according to claim 11, further comprising:

sending a first request message for requesting context information of the UE to the source cell of the UE;

Generate an RRC reconfiguration message according to the context information of the UE obtained from the source cell of the UE; and send the RRC reconfiguration message to the UE.
The handover method according to claim 11, further comprising:

sending a first request message for requesting context information of the UE to the source cell of the UE;

generating an RRC reconfiguration message according to the context information of the UE obtained from the source cell of the UE;

The RRC reconfiguration message is sent to the source cell of the UE through the inter-base station interface.
The handover method according to claim 15 or 16, further comprising:

Receive the RRC reconfiguration complete message sent by the UE, send second indication information to the source cell of the UE and send third indication information to the core network; the second indication information is used to indicate the source cell of the UE data forwarding is performed; the third indication information is used to request the core network to perform route switching.
The handover method according to claim 15, wherein after sending the second indication information to the source cell of the UE and sending the third indication information to the core network, the method further comprises:

Send sixth indication information to the source cell of the UE; the sixth indication information is used to instruct the source cell of the UE to release the context information of the UE.
A switching device, characterized in that it includes:

a sending module, configured to send a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the terminal equipment UE the source cell;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.
The switching device according to claim 19, wherein the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.
The switching device according to claim 20, wherein the identification information of the UE includes any one of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.
The handover apparatus according to claim 20, wherein the source cell identification information of the UE includes any one of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.
The switching device according to claim 19, further comprising:

The first receiving module is configured to receive an RRC reconfiguration message sent by the target cell, where the RRC reconfiguration message is used by the target cell to send to the source cell of the UE after receiving the RRC connection establishment request message. It is generated according to the context information of the UE obtained from the source cell of the UE after the first request message for requesting the context information of the UE.
The switching device according to claim 19, further comprising:

The second receiving module is configured to receive an RRC reconfiguration message sent by the source cell, where the RRC reconfiguration message is a message sent by the target cell to the source cell of the UE after receiving the RRC connection establishment request message. It is generated according to the context information of the UE obtained from the source cell of the UE after the first request message requesting the context information of the UE and sent to the source cell through the inter-base station interface.
The switching device according to claim 23 or 24, wherein the sending module is further configured to:

Send an RRC reconfiguration complete message to the target cell, so that the target cell sends second indication information to the source cell of the UE and sends third indication information to the core network; the second indication information is used to indicate the The source cell of the UE performs data forwarding; the third indication information is used to request the core network to perform route switching.
The switching device according to claim 19, further comprising a first judgment module for judging switching;

When switching from direct connection to non-direct connection is required, the judgment condition corresponding to the judgment of switching includes any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the target relay in the indirect connection is higher than the first threshold;

The channel quality of the Uu interface of the target relay in the indirect connection is higher than the second threshold;

The channel quality of the Uu interface between the terminal device and the source cell is lower than the third threshold;

The number of consecutive HARQ negative acknowledgment NACKs of the Uu interface between the terminal equipment and the source cell is higher than the fourth threshold;

A radio link failure RLF occurs on the Uu interface between the terminal device and the source cell;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
The switching device according to claim 19, further comprising a second judgment module for judging switching;

When switching from a non-direct connection to a direct connection needs to be performed, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the fifth threshold;

The channel quality of the source relay Uu interface is lower than the sixth threshold;

The channel quality of the Uu interface between the terminal equipment and the target cell is higher than the seventh threshold;

The terminal device receives fourth indication information sent by the source relay, where the fourth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgments NACKs on the direct communication interface between the terminal device and the source relay is higher than the eighth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the ninth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
The switching device according to claim 19, further comprising a third judging module for judging the switching;

When switching from the first indirect connection to the second indirect connection is required, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the tenth threshold;

The channel quality of the source relay Uu interface is lower than the eleventh threshold;

The channel quality of the direct communication interface between the terminal device and the target relay is higher than the twelfth threshold;

The channel quality of the target relay Uu interface is higher than the thirteenth threshold;

The terminal device receives fifth indication information sent by the source relay, where the fifth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgment NACKs on the direct communication interface between the terminal device and the source relay is higher than the fourteenth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the fifteenth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Wherein, the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
A switching device, characterized in that it includes:

a receiving module, configured to receive a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the UE the source cell;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.
The switching device according to claim 29, wherein the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.
The switching device according to claim 30, wherein the identification information of the UE includes any one of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.
The handover apparatus according to claim 30, wherein the source cell identification information of the UE includes any one of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.
The switching device according to claim 29, further comprising:

a first sending module, configured to send a first request message for requesting context information of the UE to the source cell of the UE;

Generate an RRC reconfiguration message according to the context information of the UE acquired from the source cell of the UE; and send the RRC reconfiguration message to the UE.
The switching device according to claim 29, further comprising:

a second sending module, configured to send a first request message for requesting context information of the UE to the source cell of the UE;

generating an RRC reconfiguration message according to the context information of the UE obtained from the source cell of the UE;

The RRC reconfiguration message is sent to the source cell of the UE through the inter-base station interface.
The switching device according to claim 33 or 34, wherein the receiving module is also used for:

Receive the RRC reconfiguration complete message sent by the UE, send second indication information to the source cell of the UE and send third indication information to the core network; the second indication information is used to indicate the source cell of the UE data forwarding is performed; the third indication information is used to request the core network to perform route switching.
The switching device according to claim 33, further comprising a third sending module, configured to send the second indication information to the source cell of the UE and the third indication information to the core network, send the second indication information to the UE's source cell and send the third indication information to the core network. The source cell of the UE sends sixth indication information; the sixth indication information is used to instruct the source cell of the UE to release the context information of the UE.
A terminal device, comprising a memory, a processor and a computer program stored on the memory and running on the processor, wherein the processor implements the following steps when executing the computer program:

Sending a radio resource control RRC connection establishment request message to the target cell; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the terminal equipment UE;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.
The terminal device according to claim 37, wherein the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.
The terminal device according to claim 38, wherein the identification information of the UE includes any one of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.
The terminal device according to claim 38, wherein the source cell identification information of the UE comprises any one of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

the frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.
The terminal device according to claim 37, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

Receive an RRC reconfiguration message sent by the target cell, where the RRC reconfiguration message is sent by the target cell to the source cell of the UE to request context information for the UE after receiving the RRC connection establishment request message The first request message is then generated according to the context information of the UE obtained from the source cell of the UE.
The terminal device according to claim 37, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

Receive an RRC reconfiguration message sent by the source cell, where the RRC reconfiguration message is sent by the target cell to the source cell of the UE to request context information for the UE after receiving the RRC connection establishment request message The first request message is then generated according to the context information of the UE obtained from the source cell of the UE and sent to the source cell through the inter-base station interface.
The terminal device according to claim 41 or 42, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

Send an RRC reconfiguration complete message to the target cell, so that the target cell sends second indication information to the source cell of the UE and sends third indication information to the core network; the second indication information is used to indicate the The source cell of the UE performs data forwarding; the third indication information is used to request the core network to perform route switching.
The terminal device according to claim 37, wherein when the processor executes the computer program, the processor is further configured to execute a judgment of switching;

When switching from direct connection to non-direct connection is required, the judgment condition corresponding to the judgment of switching includes any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the target relay in the indirect connection is higher than the first threshold;

The channel quality of the Uu interface of the target relay in the indirect connection is higher than the second threshold;

The channel quality of the Uu interface between the terminal device and the source cell is lower than the third threshold;

The number of consecutive HARQ negative acknowledgment NACKs of the Uu interface between the terminal equipment and the source cell is higher than the fourth threshold;

A radio link failure RLF occurs on the Uu interface between the terminal device and the source cell;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
The terminal device according to claim 37, wherein when the processor executes the computer program, the processor is further configured to execute a judgment of switching;

When switching from a non-direct connection to a direct connection needs to be performed, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the fifth threshold;

The channel quality of the source relay Uu interface is lower than the sixth threshold;

The channel quality of the Uu interface between the terminal equipment and the target cell is higher than the seventh threshold;

The terminal device receives fourth indication information sent by the source relay, where the fourth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgments NACKs on the direct communication interface between the terminal device and the source relay is higher than the eighth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the ninth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Wherein, the direct connection refers to the connection established between the terminal device and the network device directly through the Uu interface; the non-direct connection refers to the connection established between the terminal device and the network through the relay device.
The terminal device according to claim 37, wherein when the processor executes the computer program, the processor is further configured to execute a judgment of switching;

When switching from the first indirect connection to the second indirect connection is required, the judgment conditions corresponding to the judgment of the switching include any one or more of the following conditions:

The channel quality of the direct communication interface between the terminal device and the source relay is lower than the tenth threshold;

The channel quality of the source relay Uu interface is lower than the eleventh threshold;

The channel quality of the direct communication interface between the terminal device and the target relay is higher than the twelfth threshold;

The channel quality of the target relay Uu interface is higher than the thirteenth threshold;

The terminal device receives fifth indication information sent by the source relay, where the fifth indication information is used to instruct release of the relay connection;

The number of consecutive HARQ negative acknowledgment NACKs on the direct communication interface between the terminal device and the source relay is higher than the fourteenth threshold;

The number of consecutive HARQ NACKs on the source relay Uu interface is higher than the fifteenth threshold;

Radio link failure RLF occurs at the direct communication interface between the terminal device and the source relay;

RLF occurs on the source relay Uu interface;

Wherein, the indirect connection refers to the connection established between the terminal device and the network through the relay device.
A target cell side network device, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the following steps when executing the computer program:

receiving a radio resource control RRC connection establishment request message sent by a terminal device UE; the RRC connection establishment request message carries first indication information, and the first indication information is used to assist the target cell to determine the source cell of the UE;

Wherein, the UE is connected to at least one of the target cell and the source cell through a relay.
The target cell side network device according to claim 47, wherein the first indication information includes any one or more of the following information:

the identity information of the UE;

The source cell identification information of the UE.
The target cell side network device according to claim 48, wherein the identification information of the UE includes any one of the following:

The UE temporarily identifies the C-RNTI in the cell radio network of the source cell;

the 5G-S-TMSI of the UE;

Part of the 5G-S-TMSI of the UE.
The target cell side network device according to claim 48, wherein the source cell identification information of the UE comprises any one of the following:

The cell global identity CGI of the source cell of the UE;

The combination of the public land mobile network PLMN and the cell identity of the source cell of the UE;

The frequency point of the UE source cell and the physical cell identifier PCI;

The PCI of the UE source cell.
The target cell side network device according to claim 47, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

sending a first request message for requesting context information of the UE to the source cell of the UE;

generating an RRC reconfiguration message according to the context information of the UE obtained from the source cell of the UE;

The RRC reconfiguration message is sent to the UE.
The target cell side network device according to claim 47, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

sending a first request message for requesting context information of the UE to the source cell of the UE;

generating an RRC reconfiguration message according to the context information of the UE obtained from the source cell of the UE;

The RRC reconfiguration message is sent to the source cell of the UE through the inter-base station interface.
The target cell side network device according to claim 51 or 52, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

Receive the RRC reconfiguration complete message sent by the UE, send second indication information to the source cell of the UE and send third indication information to the core network; the second indication information is used to indicate the source cell of the UE Data forwarding is performed; the third indication information is used to request the core network to perform route switching.
The target cell side network device according to claim 51, wherein when the processor executes the computer program, the processor is further configured to implement the following steps:

After sending the second indication information to the source cell of the UE and sending the third indication information to the core network, send sixth indication information to the source cell of the UE; the sixth indication information is used to indicate the UE's The source cell releases the context information of the UE.
A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program, and the computer program is used to cause a processor to execute the switching method according to any one of claims 1 to 10. steps, or steps of executing the handover method described in any one of claims 11 to 18 .