CN114339925B

CN114339925B - Switching method, switching device, terminal equipment, network equipment and storage medium

Info

Publication number: CN114339925B
Application number: CN202011080570.8A
Authority: CN
Inventors: 赵亚利
Original assignee: Datang Mobile Communications Equipment Co Ltd
Current assignee: Datang Mobile Communications Equipment Co Ltd
Priority date: 2020-10-10
Filing date: 2020-10-10
Publication date: 2023-12-26
Anticipated expiration: 2040-10-10
Also published as: WO2022073491A1; CN114339925A

Abstract

The embodiment of the application provides a switching method, a device, a terminal device, a network device and a storage medium, wherein the switching method comprises the following steps: transmitting a Radio Resource Control (RRC) connection establishment request message to a target cell; the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE); wherein the UE is connected with at least one of the target cell and the source cell through a relay. For the scenario that the terminal equipment UE executes the switching by itself, the embodiment of the application can ensure the service continuity during the switching.

Description

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

Technical Field

The present disclosure relates to the field of communications technologies, and in particular, to a switching method, a device, a terminal device, a network device, and a storage medium.

Background

For conventional communication networks, a handover decision is performed by the network device. However, after the relay is introduced, since when to perform relay selection may depend on a terminal device (UE) implementation, handover may be initiated by the UE itself after the relay is introduced. When the handover is initiated by the UE itself, the service continuity at the time of handover cannot be guaranteed.

Disclosure of Invention

The embodiment of the application provides a switching method, a switching device, a terminal device, a network device and a storage medium, which are used for solving the problem that service continuity cannot be ensured when a terminal device UE performs switching by itself in the prior art.

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

in a first aspect, an embodiment of the present application provides a handover method, including:

transmitting a Radio Resource Control (RRC) connection establishment request message to a target cell; the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE);

wherein the UE is connected with 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:

identification information of the UE;

and the source cell identification information of the UE.

Optionally, the identification information of the UE includes any one of the following:

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

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

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

PCI of the UE source cell.

Optionally, the switching method further includes:

and receiving an RRC reconfiguration message sent by the target cell, wherein the RRC reconfiguration message is generated by the target cell according to the context information of the UE acquired from the source cell of the UE after receiving the RRC connection establishment request message and sending a first request message for requesting the context information of the UE to the source cell of the UE.

Optionally, the switching method further includes:

and receiving an RRC reconfiguration message sent by the source cell, wherein the RRC reconfiguration message is generated by the target cell according to the context information of the UE acquired from the source cell of the UE after receiving the RRC connection establishment request message and sending the first request message for requesting the context information of the UE to the source cell of the UE through an inter-base station interface.

Optionally, the switching method further includes:

Sending an RRC reconfiguration complete message to the target cell, so that the target cell sends second indication information to a source cell of the UE and sends third indication information to a core network; the second indication information is used for indicating a source cell of the UE to perform data forwarding; and the third indication information is used for requesting the core network to perform route switching.

Optionally, the method further comprises: judging switching;

when a handover is required for direct connection to indirect connection, the judging conditions corresponding to the judging of the handover include any one or more of the following conditions:

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

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

the Uu interface channel quality between the terminal equipment and the source cell is lower than a third threshold;

the number of times of the HARQ negative acknowledgement NACK between the Uu interface continuous hybrid automatic repeat request between the terminal equipment and the source cell is higher than a fourth threshold;

radio Link Failure (RLF) occurs at Uu interface between terminal equipment and source cell;

wherein, the direct connection refers to the connection established between the terminal equipment and the network equipment directly through Uu interface; the indirect connection refers to a connection established by the terminal device through the relay device and the network.

Optionally, the method further comprises: judging switching;

when a handover from indirect connection to direct connection is required, the judging conditions corresponding to the judging of the handover include any one or more of the following conditions:

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

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

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

the terminal equipment receives fourth indication information sent by the source relay, wherein the fourth indication information is used for indicating the release of relay connection;

the number of times of HARQ negative acknowledgement NACK is higher than an eighth threshold;

the number of continuous HARQ NACK times of the source relay Uu interface is higher than a ninth threshold;

a Radio Link Failure (RLF) occurs at a direct communication interface between the terminal equipment and the source relay;

the source relay Uu interface generates RLF;

Optionally, the method further comprises: judging switching;

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

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

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

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

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

the terminal equipment receives fifth indication information sent by the source relay, wherein the fifth indication information is used for indicating the release of relay connection;

the number of times of HARQ negative acknowledgement NACK is higher than a fourteen threshold;

the number of continuous HARQ NACK times of the source relay Uu interface is higher than a fifteenth threshold;

the source relay Uu interface generates RLF;

wherein, the indirect connection refers to the connection established by the terminal equipment through the relay equipment and the network.

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

receiving a Radio Resource Control (RRC) connection establishment request message sent by terminal equipment (UE); the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting a target cell to determine a source cell of the UE;

identification information of the UE;

and the source cell identification information of the UE.

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

PCI of the UE source cell.

Optionally, the switching method further includes:

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

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

and sending the RRC reconfiguration message to the source cell of the UE through an inter-base station interface.

Optionally, the switching method further includes:

receiving an RRC reconfiguration complete message sent by the UE, and sending second indication information to a source cell of the UE and third indication information to a core network; the second indication information is used for indicating a source cell of the UE to perform data forwarding; and the third indication information is used for requesting 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:

transmitting sixth indication information to a source cell of the UE; the sixth indication information is used for indicating 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 a target cell; the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE);

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, wherein the first indication information is used for assisting a target cell to determine a source cell of the UE;

In a fifth aspect, embodiments of the present application provide a terminal device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, where the processor implements the following steps when executing the computer program:

identification information of the UE;

and the source cell identification information of the UE.

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

PCI of the UE source cell.

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

Optionally, the processor is further configured to perform a handover determination when executing the computer program;

the source relay Uu interface generates RLF;

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 on the memory and executable on the processor, where the processor implements the following steps when executing the computer program:

identification information of the UE;

and the source cell identification information of the UE.

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

PCI of the UE source cell.

and sending the RRC reconfiguration message to the UE.

after sending second indication information to the source cell of the UE and sending third indication information to a core network, sending sixth indication information to the source cell of the UE; the sixth indication information is used for indicating the source cell of the UE to release the context information of the UE.

In a seventh aspect, embodiments of the present application further provide a processor-readable storage medium storing a computer program for causing the processor to perform the steps of the handover method according to the first or second aspect as described above.

According to the switching method, the device, the terminal equipment, the network equipment and the storage medium, when the terminal equipment UE and at least one of the target cell and the source cell are required to establish connection through a relay, the first indication information for assisting the target cell to determine the source cell of the UE is carried in the RRC connection establishment request message when the radio resource control RRC connection establishment request message is sent to the target cell, 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, the target cell can be ensured to acquire the source cell information when the UE automatically performs switching, service continuity can be ensured, and the problem that service continuity cannot be ensured when the UE automatically performs switching in the prior art is solved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description will be given below of the drawings that are needed in the embodiments or the prior art descriptions, and it is obvious that the drawings in the following description are some embodiments of the present application, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic diagram of a communication manner of network centralized control according to an embodiment of the present application;

FIG. 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 in an embodiment of the present application;

fig. 4 is a step flowchart of a handover method applied to a terminal device provided in an embodiment of the present application;

fig. 5 is a step flowchart of a handover method applied to a network device on a target cell side according to an embodiment of the present application;

FIG. 6 is a schematic flow chart of a handover method according to an embodiment of the present disclosure;

FIG. 7 is a second schematic flow chart of a handover method according to an embodiment of the present disclosure;

FIG. 8 is a third schematic flow chart of a switching method according to an embodiment of the present disclosure;

fig. 9 is a block diagram of a switching device applied to a terminal device according to an embodiment of the present application;

fig. 10 is a block diagram of a handover apparatus applied to a network device on a target cell side according to an embodiment of the present application;

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

fig. 12 is a schematic structural diagram of a target cell side network device according to an embodiment of the present application.

Detailed Description

The following description of the technical solutions in the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.

The conventional communication methods are mainly two, namely, a cellular network communication method and a direct communication method. As shown in fig. 1, the conventional wireless communication generally adopts a cellular network communication mode, that is, a terminal and a network device transmit uplink and downlink data/control information through a Uu interface. The direct communication mode is, as shown in fig. 2, a mode in which a neighboring terminal can perform data transmission through a direct communication link (also referred to as a sidlink) in a short range. The wireless interface corresponding to the Sidelink link is called a direct communication interface (also called a Sidelink interface or a PC5 interface)

To extend network coverage, one relatively common solution is to introduce Relay (Relay). The Relay may be a terminal having a Relay function. The case of introducing a Relay is divided into two types, one is a UE-to-Network Relay and the other is a UE-to-UE Relay.

For the UE-to-Network Relay, see fig. 3, the interface between the Relay and the Network uses the Uu interface, and the interface between the relayed UE (which may also be referred to as the remote UE) uses the direct communication interface. The link between the Relay and the network may be referred to as a Backhaul link (BH) for the remote UE.

For UE-to-UE Relay, two relayed UEs may perform data transmission through a Relay device. For simplicity of description, the connection of the UE to the network through the relay is also called an direct connection (also called a non-direct connection); the connection of the UE directly to the network through the Uu interface is also called direct connection (also called direct connection).

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

It should be noted that the bearers in the relay scenario are divided into three types:

(1) the direct communication interface carries: namely, the bearer between the remote UE and the relay UE;

(2) end-to-end bearers between the remote UE and the network device: i.e. end-to-end bearers established between the remote end and the network device;

(3) bearer of remote UE at Uu interface backhaul link: i.e. the bearer between the relay UE and the network device for carrying the remote UE data.

The bearer and the logical channel are in one-to-one correspondence no matter which type of bearer, and the logical channel has a corresponding logical channel identifier.

As described in the background section, for conventional communication networks, the handover judgment is performed by the network device. However, after the relay is introduced, since when to perform relay selection may depend on implementation of a terminal device (UE), handover (such as direct/direct or inter-direct/direct or direct/direct handover) may be initiated by the UE. When the handover is initiated by the UE itself, the service continuity at the time of handover cannot be guaranteed. In order to solve the problem, the embodiment of the application provides a switching method, a device, a terminal device, a network device and a storage medium, and the core idea of the embodiment of the application is that: if the UE executes the switching decision between the direct link and the direct link or between different direct links, the UE needs to carry first indication information in an RRC connection establishment request message sent to the target network equipment, wherein the first indication information is used for assisting the target network equipment to determine a 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, the target cell can be ensured to acquire the source cell information when the UE executes the switching by itself, the continuity of the service can be ensured, and the problem that the service continuity cannot be ensured when the UE executes the switching by itself in the prior art is solved. The switching method, the device, the terminal equipment, the network equipment and the storage medium provided by the application are explained and illustrated in detail by specific embodiments.

It should be noted that, in the following description, since the method and the apparatus are based on the same application concept, the principles of the method and the apparatus for solving the problem are similar, so that the implementation of the apparatus and the method may be referred to each other, and the repetition is not repeated.

In addition, it should be noted that the technical solution provided in the embodiments of the present application may be applicable to various systems, especially 5G systems. For example, suitable systems may be global system for mobile communications (global system of mobile communication, GSM), code division multiple access (code division multiple access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA) universal packet Radio service (general packet Radio service, GPRS), long term evolution (long term evolution, LTE), LTE frequency division duplex (frequency division duplex, FDD), LTE time division duplex (time division duplex, TDD), long term evolution-advanced (long term evolution advanced, LTE-a), universal mobile system (universal mobile telecommunication system, UMTS), worldwide interoperability for microwave access (worldwide interoperability for microwave access, wiMAX), 5G New air interface (New Radio, NR), and the like. Terminal devices and network devices are included in these various systems. Core network parts such as evolved packet system (Evloved Packet System, EPS), 5G system (5 GS) etc. may also be included in the system.

The terminal device according to 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, etc. The names of the terminal devices may also be different in different systems, for example in a 5G system, the terminal devices may be referred to as User Equipment (UE). The wireless terminal device may communicate with one or more Core Networks (CNs) via a radio access Network (Radio Access Network, RAN), which may be mobile terminal devices such as mobile phones (or "cellular" phones) and computers with mobile terminal devices, e.g., portable, pocket, hand-held, computer-built-in or vehicle-mounted mobile devices that exchange voice and/or data with the radio access Network. Such as personal communication services (Personal Communication Service, PCS) phones, cordless phones, session initiation protocol (Session Initiated Protocol, SIP) phones, wireless local loop (Wireless Local Loop, WLL) stations, personal digital assistants (Personal Digital Assistant, PDAs), and the like. The wireless terminal device may also be referred to as a system, subscriber unit (subscriber unit), subscriber station (subscriber station), mobile station (mobile), remote station (remote station), access point (access point), remote terminal device (remote terminal), access terminal device (access terminal), user terminal device (user terminal), user agent (user agent), user equipment (user device), and the embodiments of the present application are not limited. Since the terminal device forms a communication-capable network together with other network devices, such as core network devices, access network devices (i.e. base stations), the terminal device is also regarded as a network device in the present invention.

The network device according to the embodiment of the present application may be a base station, where the base station may include a plurality of cells for providing services for a terminal, and may also be a CU (Central Unit) or a DU (Distributed Unit). Depending on the particular application, the network device may also be referred to as an access point, or may be a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminal devices, or other names. The network device may be operable to exchange received air frames with internet protocol (Internet Protocol, IP) packets as a router between the wireless terminal device and the rest of the access network, which may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management for the air interface. For example, the network device according to the embodiments of the present application may be a network device (Base Transceiver Station, BTS) in a global system for mobile communications (Global System for Mobile communications, GSM) or code division multiple access (Code Division Multiple Access, CDMA), a network device (NodeB) in a wideband code division multiple access (Wide-band Code Division Multiple Access, WCDMA), an evolved network device (evolutional Node B, eNB or e-NodeB) in a long term evolution (long term evolution, LTE) system, a 5G base station (gNB) in a 5G network architecture (next generation system), a home evolved base station (Home evolved Node B, heNB), a relay node (relay node), a home base station (femto), a pico base station (pico), and the like. In some network structures, the network device may include a Centralized Unit (CU) node and a Distributed Unit (DU) node, which may also be geographically separated.

Furthermore, it should be understood that, in the embodiments of the present application, the term "and/or" describes an association relationship of association objects, which means that three relationships may exist, for example, a and/or B may be represented: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all 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 is specifically described below.

As shown in fig. 4, a step flow chart of a handover method applied to a terminal device according to an embodiment of the present application is provided, where the method includes the following steps:

step 101: transmitting a Radio Resource Control (RRC) connection establishment request message to a target cell; the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE);

In this embodiment, in order to ensure service continuity when the UE performs handover by itself, the present embodiment adopts the following technical means: when the radio resource control RRC (Radio Resource Control) connection establishment request message is sent to the target cell, the first indication information for assisting the target cell to determine the source cell of the UE is carried in the RRC connection establishment request message, 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, and the service continuity can be ensured.

In this embodiment, since the first indication information is indication information for assisting the target cell to determine the source cell of the UE, in an alternative implementation, the content of the first indication information may include at least one or more of the following information: (1) identification information of the UE; (2) and the source cell identification information of the UE. For example, in one implementation, the first indication information may only include source cell identification information of the UE, and the target cell may determine a source cell of the UE according to the source cell identification information of the UE; in another implementation manner, the first indication information may include the identification information of the UE and the source cell identification information of the UE at the same time, and the target cell may determine the source cell of the UE according to the source cell identification of the UE, and may determine which UE in the source cell is the UE.

In this embodiment, the identification information of the UE may be, but is not limited to, one of the following: (1) a Cell radio network temporary identifier C-RNTI (Cell-radio network TemporaryIdentity) of the UE in a source Cell; (2) 5G-S-TMSI or a part of 5G-S-TMSI of the UE.

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 identity CGI (Cell Global Identifier) of the source Cell of the UE may include, for example, (PLMN id+cell ID); (2) the frequency point and the physical cell identifier PCI (Physical Cell ID) of the UE source cell; (3) PCI of the UE source cell.

According to the switching method provided by the embodiment of the invention, when the UE needs to establish connection with at least one of the target cell and the source cell through the relay, the first indication information for assisting the target cell to determine the source cell of the UE is carried in the RRC connection establishment request message when the RRC connection establishment request message is sent to the target cell, 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, the target cell can be ensured to acquire the source cell information when the UE automatically performs switching, the continuity of the service can be ensured, and the problem that the service continuity cannot be ensured when the UE automatically performs switching in the prior art is solved.

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

identification information of the UE;

and the source cell identification information of the UE.

In this embodiment, it should be noted that, in one implementation manner, the first indication information may include identification information of the UE; in another implementation, the first indication information may include source cell identification information of the UE; in yet another implementation, 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 one of the following:

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information 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 form a distinction with other UEs. In one implementation, the identification information of the UE may include a cell radio network temporary identity C-RNTI of the UE in a source cell; in another implementation, the identification information of the UE may include a 5G-S-TMSI of the UE; in yet another implementation, the identification information of the UE may include a portion of the 5G-S-TMSI of the UE. It will be appreciated that the identification information of the UE may include a portion of the 5G-S-TMSI of the UE, meaning that the identification information of the UE may include a portion of the 5G-S-TMSI that can be used to accurately identify the UE, e.g., including a 5G-TMSI identification portion in the 5G-S-TMSI of the UE.

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

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

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

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 form a distinction from other cells. In one implementation, the source cell identification information of the UE may include a cell global identity CGI of a source cell of the UE; in another implementation, the combination of the public land mobile network PLMN (Public Land Mobile Network) of the UE's source Cell and the Cell Identity; in another implementation, the source cell identification information of the UE may include a frequency point+a physical cell identification PCI of the UE source cell; in yet another implementation, the source cell identification information of the UE may include a PCI of the UE source cell.

Based on 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: and sending a first request message to a source cell of the UE, wherein the first request message is used for requesting context information context of the UE, and the target cell generates an RRC reconfiguration message according to the context of the UE acquired from the source cell and sends the RRC reconfiguration message to the UE.

In this embodiment, unlike the above embodiment, the present embodiment is to receive an RRC reconfiguration message sent by a source cell, where the RRC reconfiguration message is generated by the target cell according to the context information of the UE acquired from the source cell of the UE after receiving the RRC connection establishment request message and sending the first request message to the source cell of the UE to request the context information of the UE, and then sending the first request message to the source cell through an 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 further perform the following operations: and after receiving the RRC reconfiguration complete message sent by the UE, sending third indication information to the core network, wherein the third indication information is used for requesting a core network route switching request (Path switch request) and requesting route switching.

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

Based on the foregoing embodiment, in this embodiment, before sending the radio resource control RRC connection establishment request message to the target cell, the handover method further includes: judging switching;

In the present embodiment, it is understood that switching of direct connection to indirect connection may be performed as long as one or more of the following conditions are satisfied: (1) the channel quality of a direct communication interface between the terminal equipment and the target relay in the indirect connection is higher than a first threshold; (2) the channel quality of the target relay Uu interface in the indirect connection is higher than a second threshold; (3) the Uu interface channel quality between the terminal equipment and the source cell is lower than a third threshold; (4) the number of negative acknowledgement NACK times of Uu interface continuous hybrid automatic repeat request HARQ (Hybrid Automatic Repeat reQuest) between the terminal equipment and the source cell is higher than a fourth threshold; (5) a radio link failure RLF (RadioLinkFailure) occurs at the Uu interface between the terminal equipment 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 is not limited in this embodiment.

Based on the foregoing embodiment, in this embodiment, before sending the radio resource control RRC connection establishment request message to the target cell, the method further includes: judging switching;

the source relay Uu interface generates RLF;

In the present embodiment, it is understood that switching of indirect connection to direct connection can be performed as long as one or more of the following conditions are satisfied: (1) the channel quality of a direct communication interface between the terminal equipment and the source relay is lower than a fifth threshold; (2) the channel quality of the source relay Uu interface is lower than a sixth threshold; (3) the Uu interface channel quality between the terminal equipment and the target cell is higher than a seventh threshold; (4) the terminal equipment receives fourth indication information sent by the source relay, wherein the fourth indication information is used for indicating the release of relay connection; (5) the number of times of HARQ negative acknowledgement NACK is higher than an eighth threshold; (6) the number of continuous HARQ NACK times of the source relay Uu interface is higher than a ninth threshold; (7) a Radio Link Failure (RLF) occurs at a direct communication interface between the terminal equipment and the source relay; (8) RLF occurs for the source relay Uu interface.

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 is not limited in this embodiment.

the source relay Uu interface generates RLF;

In the present embodiment, it is understood that the switching of the first indirect connection to the second indirect connection may be performed as long as one or more of the following conditions are satisfied: (1) the channel quality of a direct communication interface between the terminal equipment and the source relay is lower than a tenth threshold; (2) the channel quality of the source relay Uu interface is lower than an eleventh threshold; (3) the channel quality of a direct communication interface between the terminal equipment and the target relay is higher than a twelfth threshold; (4) the channel quality of the target relay Uu interface is higher than a thirteenth threshold; (5) the terminal equipment receives fifth indication information sent by the source relay, wherein the fifth indication information is used for indicating the release of relay connection; (6) the number of times of HARQ negative acknowledgement NACK is higher than a fourteen threshold; (7) the number of continuous HARQ NACK times of the source relay Uu interface is higher than a fifteenth threshold; (8) a Radio Link Failure (RLF) occurs at a direct communication interface between the terminal equipment and the source relay; (9) RLF occurs for the source relay Uu interface.

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 is not limited in this embodiment.

As shown in fig. 5, a step flow chart of a handover method applied to a target cell network device side according to an embodiment of the present application is provided, where the method includes the following steps:

step 201: receiving a Radio Resource Control (RRC) connection establishment request message sent by terminal equipment (UE); the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting a target cell to determine a source cell of the UE;

According to the switching method provided by the embodiment of the application, when the UE needs to establish connection with at least one of the target cell and the source cell through the relay, service continuity during switching can be ensured by receiving the Radio Resource Control (RRC) connection establishment request message carrying the first indication information sent by the UE. This is because: the first indication information is used for assisting the target cell to determine the source cell of the UE, so that the target cell can determine the source cell of the terminal equipment UE through the first indication information carried in the RRC connection establishment request message, and therefore when the UE automatically executes the handover, the target cell can be ensured to acquire the source cell information, the continuity of the service can be ensured, and the problem that the continuity of the service cannot be ensured when the UE automatically executes the handover in the prior art is solved.

identification information of the UE;

and the source cell identification information of the UE.

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information 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 form a distinction with other UEs. In one implementation, the identification information of the UE may include a cell radio network temporary identity C-RNTI of the UE in a source cell; in another implementation, the identification information of the UE may include a 5G-S-TMSI of the UE; in yet another implementation, the identification information of the UE may include a portion of the 5G-S-TMSI of the UE. It will be appreciated that the identification information of the UE may include a portion of the 5G-S-TMSI of the UE, meaning that the identification information of the UE may include a portion of the 5G-S-TMSI that can be used to accurately identify the UE, e.g., including a 5G-TMSI identification portion of the 5G-S-TMSI of the UE.

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

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

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 form a distinction from other cells. In one implementation, the source cell identification information of the UE may include a cell global identity CGI of a source cell of the UE; a combination of a PLMN of a source Cell of the UE and a Cell Identity; in another implementation, the source cell identification information of the UE may include a frequency point+a physical cell identification PCI of the UE source cell; in yet another implementation, the source cell identification information of the UE may include a PCI of the UE source cell.

In this embodiment, unlike the above-described embodiments, the RRC reconfiguration message is sent to the source cell of the UE through an inter-base station interface.

Based on 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, after sending the second instruction information to the source cell of the UE and the third instruction information to the core network, in order to improve the resource utilization rate of the source cell of the UE, the target cell sends sixth instruction information to the source cell of the UE; the sixth indication information is used for indicating the source cell of the UE to release the context information of the UE.

The present application is specifically illustrated by the following examples.

First embodiment:

as shown in fig. 6, in this embodiment, a switching procedure from direct to direct is provided, which specifically includes the following steps:

step 1: the terminal performs relay selection.

In this step, it should be noted that the Relay selection may multiplex the existing mechanisms, such as: the trigger condition for the terminal to perform relay selection may be, but is not limited to, the quality of the Uu interface channel of the terminal meeting a threshold requirement. When to perform relay selection after meeting the threshold requirement may depend on the UE implementation. New relay selection trigger conditions may also be used, including in particular 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 a threshold; b. the Uu BH channel quality of the target Relay link is higher than a threshold; c. uu link channel quality is below a threshold; d. the Uu interface continuous HARQ NACK times is higher than a threshold; e. the Uu interface generates RLF.

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

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

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

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

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

Step 6: the UE sends an RRC reconfiguration complete message to the target cell via 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, and notifies the source cell to perform data forwarding.

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

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

Step 9: and obtaining a response message corresponding to the 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, a switching procedure from direct to direct is provided, which specifically includes the following steps:

step 1: and the terminal executes the direct/direct switching judgment.

In this step, the terminal decides whether to perform an direct to direct handover, and the specific trigger condition may be, but is not limited to, one or a combination of the following: a. the channel quality of the source Relay link direct communication interface is lower than a threshold; b. the Uu BH channel quality of the source Relay link is lower than a threshold; c. uu link channel quality is above a threshold; d. the UE receives indication information sent by a source relay and indicates to release relay connection; e. the number of continuous HARQ NACK times of the direct communication interface of the source Relay link is higher than a threshold; f. the number of the continuous HARQ NACK times of the Uu BH of the source Relay link is higher than a threshold; g. RLF occurs at the source Relay link direct communication interface; h. RLF occurs for the source Relay link Uu BH.

Step 2: an RRC connection is established 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 UE needs to carry first indication information in an RRC connection establishment request message sent to the target network equipment, wherein the first indication information is used for assisting the target network equipment in determining a source cell of the UE. Wherein, the identification information of the UE may be, but is not limited to, one of the following: a. C-RNTI of the UE in a source cell; b. 5G-S-TMSI or a part of 5G-S-TMSI of the UE; the source cell identity of the UE may be, but is not limited to, one of: a. a Cell global identity CGI (PLMN id+cell ID) of a source Cell of the UE; b. a combination of PLMN and Cell Identity of the UE source Cell; c. frequency point+PCI of the UE source cell; d. PCI of the UE source cell.

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

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

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

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

Step 9: and obtaining a response message corresponding to the 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, a switching procedure from direct to direct is provided, which specifically includes the following steps:

step 1: and the terminal executes the direct/direct switching judgment.

In this step, the terminal decides whether to perform an direct to direct handover, and the specific trigger condition may be, but is not limited to, one or a combination of the following: a. the channel quality of the source Relay link direct communication interface is lower than a threshold; b. the Uu BH channel quality of the source Relay link is lower than a threshold; c. the channel quality of the direct communication interface of the target Relay link is higher than a threshold; d. the Uu BH channel quality of the target Relay link is higher than a threshold; e. the UE receives indication information sent by the source relay and indicates to release relay connection. f. The number of continuous HARQ NACK times of the direct communication interface of the source Relay link is higher than a threshold; g. the number of the continuous HARQ NACK times of the Uu BH of the source Relay link is higher than a threshold; h. RLF occurs at the source Relay link direct communication interface; i. RLF occurs for the source Relay link Uu BH.

Step 2: an RRC connection is established via the target relay and the target cell.

In this step, the UE establishes an RRC connection with the target cell through the target relay. The UE needs to carry first indication information in an RRC connection establishment request message sent to the target network equipment, wherein the first indication information is used for assisting the target network equipment in determining a source cell of the UE. Wherein, the identification information of the UE may be, but is not limited to, one of the following: a. C-RNTI of the UE in a source cell; b. 5G-S-TMSI or a part of 5G-S-TMSI of the UE; the source cell identity of the UE may be, but is not limited to, one of: a. a Cell global identity CGI (PLMN id+cell ID) of a source Cell of the UE; b. a combination of PLMN and Cell Identity of the UE source Cell; c. frequency point+PCI of the UE source cell; d. 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 8: the target cell sends a route switching request message to the core network.

Step 9: and obtaining a response message corresponding to the 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 handover decision between direct and direct links or between different direct links, the UE needs to carry first indication information in an RRC connection setup request message sent by the UE to the target cell, where 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 setup request message, thereby ensuring that the target cell can acquire source cell information, and thus ensuring continuity of service, and further solving the problem in the prior art that service continuity cannot be ensured when the UE performs handover by itself. Therefore, the embodiment of the application provides a processing mode capable of guaranteeing service continuity in direct/indirect connection switching, and the processing mode can guarantee lossless wireless link layer control protocol RLC (Radio Link Control) AM mode data in switching.

In addition, as shown in fig. 9, a block diagram of a switching device applied to a terminal device in an embodiment of the present application is shown, where the device includes:

A transmitting module 11, configured to transmit a radio resource control RRC connection establishment request message to a target cell; the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE);

It should be noted that, the device can implement all the method steps of the switching method embodiment applied to the terminal device and achieve the same technical effects, and will not be described herein.

In addition, as shown in fig. 10, a block diagram of a handover apparatus applied to a network device on a target cell side in an embodiment of the present application is shown, where the apparatus 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, wherein the first indication information is used for assisting a target cell to determine a source cell of the UE;

It should be noted that, the present apparatus can implement all the method steps of the handover method embodiment applied to the network device on the target cell side and achieve the same technical effects, and will not be described herein again.

Fig. 11 is a schematic structural diagram of a terminal device according to an embodiment of the present application, which includes a memory 1120, a transceiver 1100, and a processor 1110.

Wherein in fig. 11, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 1110 and various circuits of memory represented by memory 1120, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 1100 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. 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 Processing Unit (CPU), an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), a Field programmable gate array (Field-Programmable Gate Array, FPGA) or a complex programmable logic device (Complex Programmable Logic Device, CPLD), or it may employ a multi-core architecture.

A memory 1120 for storing a computer program; a transceiver 1100 for receiving and transmitting data under the control of the processor; a processor 1110 for reading the computer program in the memory and performing the following operations:

identification information of the UE;

and the source cell identification information of the UE.

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

PCI of the UE source cell.

Optionally, the switching method further includes:

judging switching;

Optionally, the switching method further includes:

judging switching;

the source relay Uu interface generates RLF;

Optionally, the switching method further includes:

judging switching;

the source relay Uu interface generates RLF;

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 switching method embodiment applied to the terminal device and achieve the same technical effects, and will not be described here again.

Fig. 12 is a schematic structural diagram of a target cell side network device according to an embodiment of the present application, which includes a memory 1220, a transceiver 1200, and a processor 1210.

Wherein in fig. 12, a bus architecture may comprise any number of interconnected buses and bridges, and in particular one or more processors represented by processor 1210 and various circuits of memory represented by memory 1220, linked together. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, power management circuits, etc., which are well known in the art and, therefore, will not be described further herein. The bus interface provides an interface. Transceiver 1200 may be a number of elements, including a transmitter and a receiver, providing a means for communicating with various other apparatus over a transmission medium, including wireless channels, wired channels, optical cables, etc. 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.

Processor 1210 may be a Central Processing Unit (CPU), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), field programmable gate array (Field-Programmable Gate Array, FPGA) or complex programmable logic device (Complex Programmable Logic Device, CPLD), and may also employ a multi-core architecture.

A memory 1220 for storing a computer program; a transceiver 1200 for transceiving data under the control of the processor; a processor 1210 for reading the computer program in the memory and performing the following operations:

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

identification information of the UE;

and the source cell identification information of the UE.

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

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

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 that, the target cell side network device provided in this embodiment can implement all the method steps of the handover method embodiment applied to the target cell side network device and achieve the same technical effects, and will not be described herein again.

It should be noted that, in the embodiment of the present application, the division of the units is schematic, which is merely a logic function division, and other division manners may be implemented in actual practice. In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.

The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a processor-readable storage medium. Based on such understanding, the technical solution of the present application may be embodied in essence or a part contributing to the prior art or all or part of the technical solution, in the form of a software product stored in a storage medium, including several instructions to cause a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (processor) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.

It should be noted that, the above device provided in this embodiment of the present application can implement all the method steps implemented in the method embodiment and achieve the same technical effects, and detailed descriptions of the same parts and beneficial effects as those of the method embodiment in this embodiment are omitted.

In another aspect, embodiments of the present application further provide a processor-readable storage medium storing a computer program for causing the processor to perform the method described in the above embodiments.

The processor-readable storage medium may be any available medium or data storage device that can be accessed by a processor, including, but not limited to, magnetic storage (e.g., floppy disks, hard disks, magnetic tape, magneto-optical disks (MOs), etc.), optical storage (e.g., CD, DVD, BD, HVD, etc.), semiconductor storage (e.g., ROM, EPROM, EEPROM, nonvolatile storage (NAND FLASH), solid State Disk (SSD)), and the like.

As can be seen from the above embodiments, a processor-readable storage medium stores a computer program for causing the processor to execute the steps of the handover method described above.

It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or 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 (including, but not limited to, magnetic disk storage, optical storage, and the like) having computer-usable program code embodied therein.

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 application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-executable instructions. These computer-executable instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the processor-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These processor-executable instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.

Claims

1. A method of handover, comprising:

transmitting a Radio Resource Control (RRC) connection establishment request message to a target cell; the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE) and acquiring context information of the UE from the source cell of the UE;

2. The handover method according to claim 1, wherein the first indication information includes any one or more of the following information:

identification information of the UE;

and the source cell identification information of the UE.

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

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

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

PCI of the UE source cell.

5. The handover method according to claim 1, further comprising:

6. The handover method according to claim 1, further comprising:

7. The handover method according to claim 5 or 6, further comprising:

8. The handover method according to claim 1, wherein the method further comprises: judging switching;

9. The handover method according to claim 1, wherein the method further comprises: judging switching;

the source relay Uu interface generates RLF;

10. The handover method according to claim 1, wherein the method further comprises: judging switching;

the source relay Uu interface generates RLF;

11. A method of handover, comprising:

receiving a Radio Resource Control (RRC) connection establishment request message sent by terminal equipment (UE); the RRC connection establishment request message carries first indication information, wherein the first indication information is used for assisting a target cell to determine a source cell of the UE and acquiring context information of the UE from the source cell of the UE;

12. The handover method according to claim 11, wherein the first indication information includes any one or more of:

identification information of the UE;

and the source cell identification information of the UE.

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

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

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

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

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

PCI of the UE source cell.

15. The handover method according to claim 11, further comprising:

16. The handover method according to claim 11, further comprising:

17. The handover method according to claim 15 or 16, further comprising:

18. The handover method according to claim 15, wherein after transmitting the second indication information to the source cell of the UE and the third indication information to the core network, the method further comprises:

19. A switching device, comprising:

a sending module, 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, wherein the first indication information is used for assisting the target cell to determine a source cell of a terminal device (UE) and acquiring context information of the UE from the source cell of the UE;

20. A switching device, comprising:

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, wherein the first indication information is used for assisting a target cell to determine a source cell of the UE and acquiring context information of the UE from the source cell of the UE;

21. A terminal device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the processor implements the following steps when executing the computer program:

22. The terminal device of claim 21, wherein the first indication information includes any one or more of the following:

identification information of the UE;

and the source cell identification information of the UE.

23. The terminal device according to claim 22, wherein the UE identification information includes any one of:

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

24. The terminal device of claim 22, wherein the source cell identification information of the UE includes any one of:

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

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

PCI of the UE source cell.

25. The terminal device of claim 21, wherein the processor, when executing the computer program, is further configured to implement the steps of:

26. The terminal device of claim 21, wherein the processor, when executing the computer program, is further configured to implement the steps of:

27. The terminal device according to claim 25 or 26, wherein the processor, when executing the computer program, is further configured to implement the steps of:

28. The terminal device of claim 21, wherein the processor, when executing the computer program, is further configured to perform a handover decision;

29. The terminal device of claim 21, wherein the processor, when executing the computer program, is further configured to perform a handover decision;

The source relay Uu interface generates RLF;

30. The terminal device of claim 21, wherein the processor, when executing the computer program, is further configured to perform a handover decision;

the source relay Uu interface generates RLF;

31. A target cell side network device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the computer program when executed by the processor performs the steps of:

32. The target cell-side network device of claim 31, wherein the first indication information comprises any one or more of:

identification information of the UE;

And the source cell identification information of the UE.

33. The target cell-side network device of claim 32, wherein the UE identification information includes any one of:

a cell radio network temporary identifier C-RNTI of the UE in a source cell;

5G-S-TMSI of the UE;

and part of information of the 5G-S-TMSI of the UE.

34. The target cell side network device of claim 32, wherein the source cell identification information of the UE includes any one of:

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

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

PCI of the UE source cell.

35. The target cell-side network device of claim 31, wherein the processor, when executing the computer program, is further configured to implement the steps of:

and sending the RRC reconfiguration message to the UE.

36. The target cell-side network device of claim 31, wherein the processor, when executing the computer program, is further configured to implement the steps of:

37. The target cell-side network device according to claim 35 or 36, wherein the processor when executing the computer program is further configured to implement the steps of:

38. The target cell-side network device of claim 35, wherein the processor, when executing the computer program, is further configured to implement the steps of:

39. A processor-readable storage medium, characterized in that the processor-readable storage medium stores a computer program for causing a processor to perform the steps of the handover method of any one of claims 1 to 10 or to perform the steps of the handover method of any one of claims 11 to 18.