Cell switching method, terminal, equipment and medium

Abstract

Disclosed are a cell switching method, terminal, device and medium, which belong to the field of communications, the cell switching method of the embodiment of the present application comprising: a relay device receiving a first switching signaling sent by a first network device; the relay equipment performs cell switching based on the first switching signaling; the relay equipment forwards first information to the terminal or sends second information to the terminal under the condition that the relay equipment accesses the switched first target cell; wherein the first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used for indicating the terminal to execute cell switching. According to the invention, under the condition that the relay equipment completes switching or the switching is successful, the first information is forwarded or the second information is sent, so that the switching of the far-end terminal is executed in a post-association manner, and the cell switching effect of an SL relay architecture is improved.

Description

Technical Field

[0001] The present application belongs to the field of communication technology, and specifically relates to a cell switching method, terminal, device and medium. Background Art

[0002] The relay technology in the wireless communication system is to add one or more relay nodes (e.g., Relay UE) between the base station and the terminal (e.g., Remote UE or Primary UE), which is responsible for forwarding the wireless signal once or multiple times. The Uu interface is between the relay node and the base station, and the SL (Sidelink) interface (e.g., PC5 interface) is between the relay node and the terminal.

[0003] In the existing SL relay architecture, when the relay node has a Uu traditional handover process, the relay node will perform a HO (Hand Over) notification to the terminal. After receiving the notification, the terminal generally disconnects the current relay connection, performs RRC (Radio Resource Control) connection reconstruction, and re-searches for an available Uu link or a new relay link. This processing method will cause the remote UE's service experience to be significantly interrupted or reduced during the handover, that is, the handover process communication effect under the existing SL relay architecture is poor. Summary of the invention

[0004] The embodiments of the present application provide a cell switching method, terminal, device and medium, which can solve the problem of poor communication effect of the switching process under the existing SLrelay architecture.

[0005] In a first aspect, a cell switching method is provided, the method comprising: a relay device receiving a first switching signaling sent by a first network device;

[0006] The relay device performs cell switching based on the first switching signaling;

[0007] The relay device forwards the first information to the terminal or sends the second information to the terminal when accessing the first target cell after the handover;

[0008] The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

[0009] In a second aspect, a cell switching method is provided, the method comprising:

[0010] The terminal receives the first information or the second information sent by the relay device;

[0011] The first information is used for cell switching of the terminal;

[0012] The second information is used to instruct the handover signaling execution of the terminal.

[0013] In a third aspect, a cell switching method is provided, the method comprising: a first network device performs a switching signaling sending operation, wherein the switching signaling sending operation comprises at least one of the following:

[0014] The first network device sends a first switching signaling and a first message to the relay device;

[0015] The first network device sends a first switching signaling to the relay device;

[0016] The first network device sends fourth information to the terminal;

[0017] The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

[0018] In a fourth aspect, a cell switching method is provided, the method comprising: a second network device receiving a switching request sent by a first network device;

[0019] The second network device sends a switching request response to the first network device;

[0020] The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

[0021] In a fifth aspect, a relay device is provided, including:

[0022] A first receiving module is used to receive a first switching signaling sent by a first network device;

[0023] A first switching module, configured to perform cell switching based on the first switching signaling;

[0024] A first sending module, configured to forward first information to the terminal or send second information to the terminal when accessing the first target cell after the handover;

[0025] The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

[0026] In a sixth aspect, a terminal is provided, including:

[0027] A second receiving module, used to receive the first information or the second information sent by the relay device;

[0028] The first information is used for cell switching of the terminal; and the second information is used to instruct the execution of switching signaling of the terminal.

[0029] In a seventh aspect, a first network device is provided, including:

[0030] The second sending module is configured to perform a handover signaling sending operation, wherein the handover signaling sending operation includes at least one of the following:

[0031] The first network device sends a first switching signaling and a first message to the relay device;

[0032] The first network device sends a first switching signaling to the relay device;

[0033] The first network device sends fourth information to the terminal;

[0034] The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

[0035] In an eighth aspect, a second network device is provided, including:

[0036] A third receiving module, configured to receive a switching request sent by the first network device;

[0037] A third sending module, configured to send a switching request response to the first network device;

[0038] The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

[0039] In a ninth aspect, a relay device is provided, the terminal comprising a processor and a memory, the memory storing a program or instruction that can be run on the processor, and the program or instruction, when executed by the processor, implements the steps of the method described in the first aspect.

[0040] In a tenth aspect, a relay device is provided, including a processor and a communication interface, wherein:

[0041] The communication interface is used to receive a first switching signaling sent by a first network device;

[0042] The processor is configured to perform cell switching based on the first switching signaling;

[0043] The communication interface is further used to forward the first information to the terminal or send the second information to the terminal when accessing the first target cell after the handover;

[0044] The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

[0045] In an eleventh aspect, a terminal is provided, comprising a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the method described in the second aspect are implemented.

[0046] In the twelfth aspect, a terminal is provided, comprising a communication interface, wherein the communication interface is used to receive first information or second information sent by a relay device, wherein the first information is used for cell switching of the terminal; and the second information is used to indicate the execution of switching signaling of the terminal.

[0047] In the thirteenth aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the third aspect are implemented.

[0048] In a fourteenth aspect, a network side device is provided, including a communication interface, wherein the communication interface is used to perform a handover signaling sending operation, and the handover signaling sending operation includes at least one of the following:

[0049] The first network device sends a first switching signaling and a first message to the relay device;

[0050] The first network device sends a first switching signaling to the relay device;

[0051] The first network device sends fourth information to the terminal;

[0052] The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

[0053] In the fifteenth aspect, a network side device is provided, which includes a processor and a memory, wherein the memory stores programs or instructions that can be run on the processor, and when the program or instructions are executed by the processor, the steps of the method described in the fourth aspect are implemented.

[0054] In a sixteenth aspect, a network side device is provided, comprising a communication interface, wherein the communication interface second network device receives a switching request sent by a first network device;

[0055] The second network device sends a switching request response to the first network device;

[0056] The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

[0057] In the seventeenth aspect, a readable storage medium is provided, on which a program or instruction is stored. When the program or instruction is executed by a processor, the steps of the method described in the first aspect are implemented, or the steps of the method described in the second aspect are implemented, or the steps of the method described in the third aspect are implemented, or the steps of the method described in the fourth aspect are implemented.

[0058] In the eighteenth aspect, a communication system is provided, including: a relay device, a terminal, a first network device and a second network device, the relay device can be used to execute the steps of the method described in the first aspect, the terminal can be used to execute the steps of the method described in the second aspect, the first network device can be used to execute the steps of the method described in the third aspect, and the second network device can be used to execute the steps of the method described in the fourth aspect.

[0059] In the seventeenth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instructions to implement the method as described in the first aspect, or the method as described in the second aspect, or the method as described in the third aspect, or the method as described in the fourth aspect.

[0060] In the eighteenth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the program / program product is executed by at least one processor to implement the steps of the method as described in the first aspect, or the program / program product is executed by at least one processor to implement the steps of the method as described in the second aspect, or the program / program product is executed by at least one processor to implement the steps of the method as described in the third aspect, or the program / program product is executed by at least one processor to implement the steps of the method as described in the fourth aspect.

[0061] In an embodiment of the present application, a relay device receives a first switching signaling sent by a first network device; the relay device performs a cell switching based on the first switching signaling; the relay device forwards a first message to a terminal or sends a second message to the terminal when accessing the first target cell after the switching; wherein the first message is obtained by the relay device receiving the information sent by the first network device, and the first message is used for the cell switching of the terminal; the second message is used to instruct the terminal to perform the cell switching. When the relay device completes the switching or the switching is successful, by forwarding the first message or sending the second message, the switching of the remote terminal is performed in a later association, thereby improving the cell switching effect of the SLrelay architecture. BRIEF DESCRIPTION OF THE DRAWINGS

[0062] Figure 1 is a block diagram of a wireless communication system to which the embodiments of the present application can be applied;

[0063] Figure 2 is a block diagram of another wireless communication system to which the embodiments of the present application can be applied;

[0064] Figure 3 is a block diagram of another wireless communication system to which the embodiments of the present application can be applied;

[0065] Figure 4 is a flow chart of a cell switching method provided in an embodiment of the present application;

[0066] Figure 5 is a flow chart of another cell switching method provided in an embodiment of the present application;

[0067] Figure 6 is a flow chart of another cell switching method provided in an embodiment of the present application;

[0068] Figure 7 is a flow chart of another cell switching method provided in an embodiment of the present application;

[0069] Figure 8 is a schematic diagram of a communication device provided in an embodiment of the present application;

[0070] Fig. 9 is a schematic diagram of a relay device provided in an embodiment of the present application;

[0071] Fig.10 is a schematic diagram of a terminal provided in an embodiment of the present application;

[0072] Fig.11 It is a schematic diagram of a network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0073] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field belong to the scope of protection of this application.

[0074] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0075] The term "indication" in this application can be a direct indication (or explicit indication) or an indirect indication (or implicit indication). A direct indication can be understood as the sender explicitly informing the receiver of specific information, operations to be performed, or request results in the sent indication; an indirect indication can be understood as the receiver determining the corresponding information according to the indication sent by the sender, or making a judgment and determining the operation to be performed or the request result according to the judgment result.

[0076] It is worth noting that the technology described in the embodiments of the present application is not limited to the Long Term Evolution (LTE) / LTE-Advanced (LTE-A) system, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes a New Radio (NR) system for illustrative purposes, and NR terminology is used in most of the following descriptions, but these technologies can also be applied to systems other than NR systems, such as the 6th generation (6 th Generation, 6G) communication system.

[0077] Figure 1A block diagram of a wireless communication system applicable to an embodiment of the present application is shown. The wireless communication system includes a terminal 11 and a network side device 12. Among them, the terminal 11 can be a mobile phone, a tablet computer (Tablet Personal Computer), a laptop computer (Laptop Computer), a notebook computer, a personal digital assistant (Personal Digital Assistant, PDA), a handheld computer, a netbook, an ultra-mobile personal computer (Ultra-mobile Personal Computer, UMPC), a mobile Internet device (Mobile Internet Device, MID), an augmented reality (Augmented Reality, AR), a virtual reality (Virtual Reality, VR) device, a robot, a wearable device (Wearable Device), an aircraft (flight vehicle), a vehicle-mounted device (Vehicle User Equipment, VUE), a ship-mounted device, a pedestrian terminal (Pedestrian User Equipment, PUE), a smart home (home appliances with wireless communication functions, such as refrigerators, televisions, washing machines or furniture, etc.), a game console, a personal computer (Personal Computer, PC), a teller machine or a self-service machine and other terminal side devices. Wearable devices include: smart watches, smart bracelets, smart headphones, smart glasses, smart jewelry (smart bracelets, smart bracelets, smart rings, smart necklaces, smart anklets, smart anklets, etc.), smart wristbands, smart clothing, etc. Among them, the vehicle-mounted device can also be called a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiment of the present application. The network side device 12 may include an access network device or a core network device, wherein the access network device may also be referred to as a radio access network (Radio Access Network, RAN) device, a radio access network function or a radio access network unit. The access network device may include a base station, a wireless local area network (Wireless Local Area Network, WLAN) access point (Access Point, AP) or a wireless fidelity (Wireless Fidelity, WiFi) node, etc.Among them, the base station may be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a Relay Base Station (RBS), a Serving Base Station (SBS), a Base Transceiver Station (BTS), a radio base station, a radio transceiver, a Basic Service Set (BSS), an Extended Service Set (ESS), a Home Node B (HNB), a Home Evolved Node B, a Transmission Reception Point (TRP) or other appropriate terms in the field. As long as the same technical effect is achieved, the base station is not limited to specific technical terms. It should be noted that in the embodiments of the present application, only the base station in the NR system is used as an example for introduction, and the specific type of the base station is not limited.

[0078] For ease of understanding, some contents involved in the embodiments of the present application are described below:

[0079] Relay technology in wireless communication systems is to add one or more relay nodes between the base station and the terminal, which is responsible for forwarding the wireless signal once or multiple times, that is, the wireless signal needs to go through multiple hops to reach the terminal. Wireless relay technology can not only be used to expand cell coverage and fill in cell coverage blind spots, but also to increase cell capacity through spatial resource reuse. For indoor coverage, Relay technology can also overcome penetration loss and improve indoor coverage quality.

[0080] Taking the simpler two-hop relay as an example, wireless relay splits a base station-terminal link into two links: base station-relay station and relay station-terminal. This provides the opportunity to replace a link with poor quality with two links with better quality to obtain higher link capacity and better coverage.

[0081] The relay currently supported in LTE (Long Term Evolution) is U2N relay (UE-to-Network relay), that is, one end of the relay is connected to the UE, and the other end is connected to the network side. The UE connected to the relay is called remote UE.

[0082] NR will also study how to support the UE-to-Network Relay mechanism. Typical scenarios include Figure 2 As shown, the relay UE is used as a relay station for example. In a typical UE-to-Network scenario, the Remote UE needs to transmit data with the network side, but due to poor coverage, the Relay UE is found as a relay. The Uu interface is between the Relay UE and the base station, and the sidelink (PC5) interface is between the Relay UE and the Remote UE. Generally speaking, the Relay UE is open and can serve any Remote UE.

[0083] For SL relay architecture, in addition to Figure 2 The typical scenarios shown in FIG. 1 also include multi-path scenarios, such as Figure 3 As shown, it means that the Remote UE has established both an indirect path and a direct path. The indirect path refers to the wireless link established between the Remote UE (or Primary UE) and the base station through the Relay UE (or Secondary UE) and the Uu air interface of the Relay UE (or Secondary UE); the direct path refers to the wireless link established between the Remote UE (or Primary UE) and the base station through its own Uu air interface. It should be noted that Figure 3 CP refers to the control plane, and UP refers to the user plane. Figure 3 The three multipath scenarios are shown for illustration only. Figure 3 Three methods are shown.

[0084] The SL relay architecture of the current existing technical solution only supports the process of switching between the relay UE and the remote UE separately, that is, when the relay UE undergoes the Uu traditional switching process, the relay UE will send a switching notification (HO notification) to the remote UE. After receiving the notification, the remote UE generally disconnects the current relay connection, reestablishes the RRC connection, and finds an available Uu link or a new relay link again. This processing method will cause a significant interruption and decline in the service experience of the remote UE during this process, and the signaling process is not simplified, which is not conducive to system efficiency or UE experience.

[0085] The cell switching method and related devices provided in the embodiments of the present application are described in detail below through some embodiments and their application scenarios in combination with the accompanying drawings.

[0086] See also Figure 4 , Figure 4 is a flowchart of a cell switching method provided in an embodiment of the present application, which is used for a relay device, such as Figure 4 As shown, the method comprises the following steps:

[0087] Step 401: A relay device receives a first switching signaling sent by a first network device.

[0088] In the embodiment of the present application, the first network device can be understood as a source node before switching, or a service node before switching. The relay device can be understood as a relay station between the first network device and the terminal. A Uu interface is used between the relay device and the first network device. In the embodiment of the present application, the terminal can also be described as a remote UE, a remote terminal, a Primary UE, etc.

[0089] Optionally, the relay device is connected to the terminal in any of the following ways: PC5, Bluetooth, ideal backhaul, and wireless local area network WLAN.

[0090] The cell switching process in the embodiment of the present application involves a relay device (e.g., relay UE) and one or more remote UEs connected to it performing a group switching process. When group switching needs to be performed, the first network device sends a first switching signaling to the relay device. Among them, the switching signaling can also be described as a switching command. During the above-mentioned group switching process, the target cell switched by the relay device is the first target cell, and the target cell switched by the terminal is the second target cell, wherein the first target cell and the second target cell are the same cell or different cells, and the first target cell and the second target cell belong to the same target node. In other words, the target cells of the Remote UE and the relay device can be the same or different, and the target cells of the Remote UE and the relay device can be controlled by the same node (e.g., gNB).

[0091] In an optional implementation manner, the target cells of the Remote UE and the relay device may also be controlled by different nodes.

[0092] The above group switching process can be understood as the associated switching between the relay device and the remote terminal, which is different from the process in which the terminal disconnects the relay connection when the existing relay node undergoes the Uu traditional switching process. A typical scenario of the group switching process may occur in a scenario of accompanying movement, such as the remote UE and the relay UE moving together in a car or the same means of transport. It is understandable that the switching scenario of the embodiment of the present application is not limited to the scenario of accompanying movement.

[0093] In an embodiment of the present application, the judgment or triggering of the group switching process can be determined by the network side or by the terminal side. Optionally, the basic judgment method can be determined by the measurement of the relay device, or it can be performed by the measurement of the remote UE and the relay device. For example, when the signal quality of the source cell of the relay UE is poor to below a certain threshold (for example, 1), and / or the signal quality of the target cell is good to above a certain threshold (for example, 2), if the channel quality between the remote UE and the relay UE does not change significantly at this time, that is, it is still within the range of normal communication, it can be determined that the relay UE and the remote UE can be group moved and the group switching process can be performed.

[0094] Optionally, before the relay device receives the first switching signaling sent by the first network device, the method further includes:

[0095] The relay device sends the first measurement result to the first network device;

[0096] The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0097] In an embodiment of the present application, the above-mentioned relay device sends a measurement result to the first network device, and the measurement result may be the measurement result of the relay device itself, or the measurement result of the remote UE, or the measurement result of the relay device itself and the measurement result of the remote UE. Optionally, the first network device (source node) may determine whether to perform group switching. Optionally, the determination of the above-mentioned measurement result may utilize measurement data from both the relay UE and the remote UE at the same time. Since these UEs are all in a connected state, the network side may configure the measurement amount for each UE through dedicated RRC signaling, and consider certain correlations during configuration, such as alignment of measurement cycles, etc.

[0098] Optionally, considering a multipath scenario, when the first network device determines whether to perform group switching based on the measurement result, the measurement result may also be obtained from the terminal.

[0099] Optionally, the first network device receiving the measurement result includes:

[0100] The first network device receives a first measurement result sent by the relay device;

[0101] The first network device receives a second measurement result sent by the terminal;

[0102] The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0103] Optionally, the relay device sending the first measurement result to the first network device includes:

[0104] When a Uu measurement event is satisfied, a first measurement result is sent to a first network device; the first measurement result includes a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0105] In the embodiment of the present application, when the measurement event of Uu is met, the first sub-measurement result of the relay device can be reported, and the reporting of the second sub-measurement result of the terminal is also triggered. For example, some special measurement triggering mechanisms can be used to ensure that relevant measurement results can be collected in a timely manner. For example, when the relay UE meets the triggering of the measurement event of Uu (the link quality of the current cell is lower than the threshold and / or the link quality of the target cell is higher than the threshold), the relay UE can report the measurement result between the relay UE and the remote UE while reporting the Uu measurement result (although the measurement result of the inter-UE may not meet the configured triggering condition at this time, or there is no need to judge the measurement result of the inter-UE), where the inter-UE is between the relay UE and the remote UE.

[0106] Optionally, when the first measurement result includes the second sub-measurement result of the terminal, before the relay device sends the first measurement result to the first network device, the method further includes at least one of the following:

[0107] The relay device receives a second sub-measurement result sent by the terminal through the SL RRC;

[0108] The relay device receives the second sub-measurement result sent by the terminal through the SL RLC channel.

[0109] Optionally, when the relay device sends the first sub-measurement result and the second sub-measurement result of the terminal to the first network device, the first sub-measurement result and the second sub-measurement result may be sent together or separately. Optionally, the relay UE may also trigger the remote UE to report the measurement result between the relay UE and the remote UE once through the PC5 interface (although the inter-UE measurement result may not meet the triggering condition configured by the RRC at this time).

[0110] In the embodiment of the present application, the relay device obtains the measurement result of the terminal through the SL RRC or SL RLC (Radio Link Control) channel. Optionally, the measurement result of the remote UE can also be packaged and reported together with the measurement result of the relay UE. For example, the remote UE first sends the measurement result to the relay UE through the SL RRC (for example, PC5RRC), and then the relay UE piggybacks on its own measurement report and sends it to the serving cell together, that is, the first sub-measurement result of the relay device and the second sub-measurement result of the terminal are both sent through Uu SRB1 (Signalling Radio Bearer). Alternatively, the remote UE first sends the measurement report to the relay UE through SL RLC (for example, SLRLC channel for E2E Uu SRB mapping). In particular, it can also carry an explicit tag, and then the relay UE sends its own measurement report to the first network device through Uu SRB1 (Signalling Radio Bearer) and sends the measurement report of the remote UE to the first network device through the Uu RLC channel (Uu RLCchannel for E2E Uu SRB mapping), that is, the first sub-measurement result of the relay device and the second sub-measurement result of the terminal are sent together on the Uu interface through different channels.

[0111] It can be understood that the RLC channel is an L2 transmission pipeline, and its protocol layer only has three layers: RLC / MAC / PHY, while SRB1 focuses on L3, including RRC and PDCP layers. SRB1 and RLC channel are different concepts.

[0112] Optionally, in the case of a second sub-measurement result sent by the receiving terminal through the SL RLC channel, the second sub-measurement result carries a third identifier, wherein the third identifier is used to identify that the second sub-measurement result needs to be sent together with the first sub-measurement result or to identify the type of the second sub-measurement result.

[0113] Since the information sent by the terminal to the relay through the SL RLC channel is usually forwarded directly to the network device through the Uu RLC channel, in the embodiment of the present application, in order to ensure that the service cell can obtain all measurement results simultaneously or quickly, so as to facilitate accurate group switching judgment, the second sub-measurement result sent by the terminal through the SL RLC channel is identified (third identification), so that the relay sends the second sub-measurement result to the first network device at an appropriate time, that is, the third identification is used to identify the type of the second sub-measurement result. Through the third identification, the second sub-measurement result is identified as a special data type on the RLC channel to distinguish it from other ordinary data, so as to facilitate special processing, for example, not directly forwarding. In other words, the third identification identifies the second sub-measurement result as a measurement result type that needs to be sent in association with the first sub-measurement result. For example, in the case of satisfying the Uu measurement event, the first sub-measurement result of the relay device and the second sub-measurement result of the terminal are sent together. Due to the transmission resource, the first sub-measurement result and the second sub-measurement result may be sent together, or they may be sent in a close time, which enables the service cell to obtain all measurement results simultaneously or quickly.

[0114] Step 402: The relay device performs cell switching based on the first switching signaling.

[0115] In the embodiment of the present application, the relay device performs cell switching according to the switching signaling, and can refer to the existing switching signaling configuration and execution method, which is not limited in the embodiment of the present application.

[0116] Step 403: When the relay device accesses the first target cell after the handover, the relay device forwards the first information to the terminal or sends the second information to the terminal. The first information is obtained by the relay device receiving the information sent by the first network device, and the first information is used for the cell handover of the terminal; the second information is used to instruct the terminal to perform the cell handover.

[0117] An embodiment of the present application provides a mobility processing method for SL relay, which involves a group switching process. When a relay device completes switching or switches successfully, the switching of the remote terminal is associated and executed after (relay device switching) by forwarding a first message or sending a second message, so that the SL relay architecture is still maintained after the switching, which not only ensures the switching experience of the remote UE but also improves the compatibility with the group mobility scenario, and further improves the system efficiency on the basis of ensuring the UE service experience.

[0118] Optionally, the situation of the relay device in the first target cell after access switching includes any one of the following situations: the relay device randomly accesses successfully, the relay device RRC reconfiguration completion signaling is sent, and the relay device RRC reconfiguration completion signaling is sent successfully.

[0119] In an embodiment of the present application, the relay device sends the first information or the second information at an appropriate time point when successfully accessing the target cell, wherein the appropriate time point may be when the relay device successfully accesses the target cell randomly, when the relay device sends RRC reconfiguration completion signaling, or when the relay device sends RRC reconfiguration completion signaling successfully.

[0120] Optionally, the first switching signaling carries relay link configuration information, and the terminal is a terminal corresponding to the relay link configuration information.

[0121] In the embodiment of the present application, the terminal to which the relay device forwards the first information or sends the second information is determined based on relay link configuration information, and the above relay link configuration information can be carried in the first switching signaling.

[0122] In the embodiment of the present application, when the relay device accesses the first target cell after the handover, forwarding the first information to the terminal or sending the second information to the terminal can be understood as two ways to start the handover process of the remote UE.

[0123] Method 1: forwarding the first information to the terminal (remote UE)

[0124] In the embodiment of the present application, the first information is used for cell switching of the terminal. Optionally, the switching signaling belonging to the remote terminal, relative to the above-mentioned first switching signaling, for the remote terminal, the above-mentioned first information can be understood as the second switching signaling. Optionally, the information sent by the first network device to the terminal through the relay adopts an end-to-end security mechanism, and the relay device cannot actually interpret such information. That is to say, for the relay device, it only knows that the above-mentioned first information needs to be forwarded in a special way, and does not know that it is a switching signaling. The special features of the above-mentioned special forwarding method include but are not limited to: forwarding timing, forwarding signaling and forwarding pipeline. In the embodiment of the present application, the first information is described as a switching signaling in some content, only for the convenience of understanding. It should be noted that the first information may also be other messages used to indicate switching.

[0125] Under normal circumstances, the information sent by the first network device to the terminal through the relay device will be directly forwarded by the relay device. The special features of the forwarding of the first information in the embodiment of the present application include limiting the forwarding timing of the first information to the first target cell after the relay device accesses the switch.

[0126] In order to forward the first information, the relay device needs to obtain the first information from the first network device in advance. In order to forward the first information at the forwarding opportunity, the relay device needs to cache the first information. The first information and the first switching signaling are both sent to the relay device through the first network device. During the sending process, the first information and the first switching signaling can be sent through the same signaling or different signaling, and can be sent through the same transmission channel or different transmission channels. The serving cell sends the switching signaling of all UEs participating in the group switching to the relay device, which is then distributed downward by the relay device at an appropriate time point. Optionally, the same transmission channel can be understood as the same bearer, and the different transmission pipes can be understood as different bearers, which can be carried through Uu SRB1 or RLC channel, etc.

[0127] Optionally, when the relay device accesses the first target cell after the handover, before forwarding the first information to the terminal, the method further includes:

[0128] The relay device receives the first information sent by the first network device;

[0129] The relay device caches the first information;

[0130] The first information and the first switching signaling are sent through the same signaling, or the first information and the first switching signaling are sent through different signaling, or the first information and the first switching signaling are sent through the same transmission channel, or the first information and the first switching signaling are sent through different transmission channels.

[0131] Optionally, the relay device receives the first information sent by the first network device, including any of the following:

[0132] The relay device receives the first information sent by the first network device through the signaling radio bearer SRB1;

[0133] The relay device receives the first information sent by the first network device through a Uu interface radio link control RLC channel.

[0134] Optionally, the forwarding the first information to the terminal includes any one of the following:

[0135] The relay device forwards the first information to the terminal via a side link SL radio resource control RRC message;

[0136] The relay device forwards the first information to the terminal through a side link SL RLC channel.

[0137] It can be understood that the handover command of the relay device, such as RRC signaling, is sent by the serving cell in UuSRB1 of the relay device, which is consistent with all common UEs, that is, the above-mentioned first handover signaling is sent by the first network device to the relay device through Uu SRB1. The relay device receives the first information sent by the first network device through the signaling radio bearer SRB1, that is, the first information and the first handover signaling are sent through the same transmission channel; the relay device receives the first information sent by the first network device through the Uu RLC channel, that is, the first information and the first handover signaling are sent through different transmission channels.

[0138] The first approach may include method 1: a situation where the relay device receives the first information sent by the first network device through SRB1.

[0139] Considering that the handover command sent by the serving cell to the remote UE is transmitted through the Uu RLC channel, the relay UE cannot identify it. In order to enable the relay UE to control the time point when the remote UE receives and executes the handover command, the handover command of the remote UE can be piggybacked in the RRC message of the relay UE and carried by the Uu SRB1 of the relay UE. In this case, the handover signaling of the remote UE and the handover signaling of the relay device can be sent in one RRC or in two RRC signalings.

[0140] Optionally, the first information is sent in a container manner.

[0141] It can be understood that the relay device can usually identify the information it receives through SRB1. In the case where the first information is received through SRB1, in order to ensure the end-to-end security of the first information, the first information can be sent in a container manner to prevent the relay UE from illegally reading the above first information. For example, when sending an RRC reconfiguration signaling carrying switching information to the relay UE, in the reconfiguration signaling, the switching signaling of all remote UEs related to this group switching is carried in a container manner, and the switching signaling of the remote UE can also be carried in a container manner in other signaling, and sent to the relay UE in two RRC signalings. In short, the relay UE can receive its own switching information and obtain the switching signaling of other remote UEs in the related group switching at the same time. The container method is to prevent the relay UE from illegally reading. The signaling uses end-to-end security and cannot be interpreted by the relay UE. The first information may be targeted at one or more terminals. The network device needs to inform the relay device of the remote UE information of each switching command (first information) so that the relay device can find the correct remote UE when forwarding in the next step.

[0142] When the relay UE obtains the handover information, it caches the handover information of other remote UEs and first performs its own handover execution process, including reconfiguration according to the signaling content, random access to the target cell, and sending RRC reconfiguration completion signaling to the target cell. At the appropriate time point when the target cell is successfully accessed, such as random access success, or RRC reconfiguration completion signaling is sent or sent successfully, the handover command of the remote UE is sent to each UE. The sending method can be through SL RRC message (PC5 RRC), or through SL RLC channel (remote UE E2E SRB1 mapped to PC5 / SLRLC channel of SRB) to send to the corresponding remote UE.

[0143] Mode 1 may also include method 2: the relay device receives the first information sent by the first network device through the Uu RLC channel.

[0144] The handover command sent by the serving cell to the remote UE can be forwarded to the remote UE by the relay UE, wherein the Uu RLC channel (remote UE E2E SRB1 mapped to relay UE Uu RLCchannel of SRB) is adopted on the Uu interface, and the SL RLC channel (remote UE E2E SRB1 mapped to PC5 / SL RLC channel of SRB) is adopted on the PC5 interface. For other RRC messages (RRC messages not related to group handover), the relay UE does not need special processing and can directly forward them. For the RRC reconfiguration signaling (first information) related to group handover that needs to be processed, it is necessary to perform caching and forward them when the forwarding opportunity arrives.

[0145] Optionally, when the relay device receives the first information sent by the first network device through the Uu interface wireless link control RLC channel, the first information carries a first identifier, wherein the first identifier is used to identify that the first information needs to be cached or to identify the type of the first information.

[0146] In the embodiment of the present application, the first identifier, for example, may be in an L2 header, SRAP header, RLC header or MAC header, carrying a special indication to inform the relay that this is a special RRC signaling, or the first identifier is used to inform the relay that the current information (first information) is a special type of RRC signaling, which requires special processing, needs to be cached, and forwarded at a specific time. The relay UE can then identify these special packets in the general RLC channel, cache them, and send them down after processing its own handover reconfiguration.

[0147] In the embodiment of the present application, the relay device receives the first information sent by the first network device through the Uu RLC channel. The first switching signaling is sent by the first network device to the relay device through the Uu SRB1, that is, the order in which the relay device receives the first information and the first switching signaling is not fixed. The relay device receives the first switching information simultaneously or sequentially, and caches other first information with special marks (switching information of the remote UE). The relay device first performs its own switching execution process, including reconfiguration according to the signaling content, random access to the target cell, and sending RRC reconfiguration completion signaling to the target cell. And at an appropriate time point when the target cell is successfully accessed, such as random access success, or RRC reconfiguration completion signaling is sent or sent successfully, the switching command of the remote UE is sent to each UE, and the sending method can be the original path (SL RLC channel), that is, through the remote UE E2E SRB1 mapped to PC5 / SL RLC channelof SRB to send to the corresponding remote UE.

[0148] In method 2, since the switching command reaches the relay device through the original path (Uu RLC channel), it already carries the remote UE ID information and bearer information. Therefore, when it is forwarded downward again, the corresponding remote UE's SL RLC channel can be found according to normal data processing without additional operation.

[0149] Method 2: Sending the second information to the terminal (remote UE)

[0150] In the embodiment of the present application, the serving cell normally sends the switching signaling to the relay device and the remote UE. After the relay UE gives the remote UE an instruction (second information), the remote UE starts to execute the switching command content.

[0151] Optionally, when the relay device accesses the first target cell after the handover, before sending the second information to the terminal, the method further includes:

[0152] The relay device receives fourth information sent by the first network device;

[0153] The relay device forwards the fourth information to the terminal;

[0154] The fourth information and the first switching signaling are sent through the same signaling, or the fourth information and the first switching signaling are sent through different signaling, or the fourth information and the first switching signaling are sent through the same transmission channel, or the fourth information and the first switching signaling are sent through different transmission channels.

[0155] In an embodiment of the present application, the fourth information is used for cell switching of the terminal. Optionally, the fourth information belongs to the switching signaling of the remote terminal. Compared with the above-mentioned first switching signaling, for the remote terminal, the above-mentioned fourth information can be understood as the third switching signaling. It should be noted that the fourth information can also be other messages used to indicate switching. Optionally, the information sent by the first network device to the terminal through the relay adopts an end-to-end security mechanism. The relay device cannot actually interpret such information, nor does it cache the fourth information, but only forwards it as ordinary data. In an embodiment of the present application, the fourth information is described as switching signaling in some content for the convenience of understanding only. In an optional scheme (in a multi-path scenario), the first network device directly sends the above-mentioned fourth information to the terminal device through the Uu interface.

[0156] Optionally, when the relay device accesses the first target cell after the handover, sending the second information to the terminal includes:

[0157] When the first switching signaling carries a second identifier or relay link configuration information and the relay device accesses the first target cell after the switching, the relay device sends the second information to the terminal.

[0158] The second identifier is used to instruct the relay device to send the second information to the terminal when accessing the first target cell after the handover.

[0159] In the embodiment of the present application, the second identifier can be understood as an explicit group switching identifier, and the relay link configuration information (relay link configuration) can be an implicit indication of group switching. In the case of explicit or implicit indication of group switching, the remote UE is triggered to execute the switching command of the remote UE after the relay device is successfully switched by sending the second information.

[0160] Correspondingly, the handover signaling (fourth information) sent by the serving cell to the remote UE also carries the group handover identifier, that is, the serving cell normally sends the handover signaling to the relay device and the remote UE, and each handover signaling carries the group handover identifier.

[0161] The handover signaling sent by the serving cell to the remote UE may also indicate group handover explicitly or implicitly by carrying the second identifier or relay link configuration information. The handover signaling (fourth information) sent by the serving cell to the remote UE may be sent directly by the serving cell to the remote UE (in a multipath scenario), or may be sent by the serving cell to the remote UE via a relay node. In this case, the relay node does not need to cache the fourth information and may directly forward it.

[0162] The second identifier is used to identify the type of handover signaling (e.g., the first handover signaling or the fourth information), that is, to indicate that the current handover signaling is a special type of handover signaling. For the relay UE, receiving the handover signaling (the first handover signaling) carrying the second identifier means that it has completed the successful access to the target cell or successfully returned the completion signaling, and needs to notify the remote UE. For the remote UE, receiving the handover signaling (the fourth information) carrying the second identifier means that the handover command cannot be executed immediately, but needs to wait for the explicit notification of the relay UE before executing it.

[0163] This method does not change the signaling path and method. The serving cell sends the RRC reconfiguration signaling carrying the handover information to the relay device and remote UE according to the normal process and channel. However, it is necessary to explicitly indicate in the reconfiguration signaling, such as the group handover identifier. These explicit indications are to distinguish the processing from the normal handover process, or implicit indications, such as the relay link configuration is naturally carried in the handover command, which means that this is a group handover.

[0164] For the relay UE, getting an explicit or implicit indication means that it has completed the successful access to the target cell or successfully returned the completion signaling, and needs to notify the remote UE. For the remote UE, getting an explicit or implicit indication means that the handover command cannot be executed immediately, but needs to wait for the explicit notification from the relay UE before executing it.

[0165] When the Relay UE receives the handover information, it first performs its own handover execution process, including reconfiguration according to the signaling content, random access to the target cell, and sending RRC reconfiguration completion signaling to the target cell. At an appropriate time point when the target cell is successfully accessed, such as random access success, or RRC reconfiguration completion signaling is sent or sent successfully, an explicit notification is sent to each remote UE in the group through the PC5 interface (where the judgment criterion for the remote UE in the group is whether the remote UE has a relay link configuration with itself in the configuration of the target cell). After receiving the explicit notification, the Remote UE starts the handover process.

[0166] Optionally, the relay device sends the second information to the terminal, including:

[0167] The relay device sends the second information to the terminal through a SL RRC message;

[0168] The relay device sends the second information to the terminal through an SL layer 2 instruction.

[0169] In this embodiment of the present application, the above-mentioned second information can be sent via SL RRC or SL L2 indication.

[0170] In the embodiment of the present application, the relay device is a UE in a group of UEs that directly communicates with the serving cell. It should take the lead in the group of UEs. It is necessary to ensure that the relay device first receives its own switching information and completes access and configuration to the target cell successfully. After that, the remote UE can complete the new configuration of the target cell according to its own switching information, thereby ensuring that the RRC reconfiguration message carrying the switching information can reach the UE in each group in the correct order or be executed in the UE in each group in the correct order, thereby improving the switching efficiency and experience, and improving the UE experience and system efficiency on the basis of ensuring data transmission.

[0171] Optionally, the method further includes: when the relay device fails in cell switching, performing at least one of the following operations:

[0172] deleting the first cached information;

[0173] Sending third information to the terminal, where the third information is used to indicate that the relay device fails to perform a cell handover or performs an RRC reconstruction.

[0174] In the embodiment of the present application, when the cell switching is successful, the relay device forwards the first information or sends the second information, so that the remote UE executes the switching command content. If an abnormality occurs in the process of the relay UE performing the switching, such as a switching failure, the relay UE, in addition to performing corresponding post-switching failure processing on the Uu interface, such as RRC connection reestablishment, also needs to perform corresponding processing on the remote UE, such as deleting the switching command of the remote UE, and or notifying the remote UE that a switching failure or RRC connection reestablishment has occurred.

[0175] In the case where the relay device fails in cell switching, the remote UE does not need to perform the associated group switching. If there is cached first information (remote UE switching signaling), it does not need to be forwarded and is directly deleted. The remote UE can also be notified of the relay device cell switching failure or RRC reestablishment so that the remote UE can choose to release the connection or maintain the connection.

[0176] Specifically, optionally, when a handover failure occurs on the air interface, for example, the Relay UE fails to successfully access the target cell, or the relevant handover timer T304 times out, the Relay UE needs to perform corresponding actions, such as RRC connection reconstruction. At this time, the handover command that the relay UE still caches and needs to switch to the remote UE under it becomes invalid and can be deleted. Furthermore, the relay UE can notify the remote UE below it through SL RRC (PC5 RRC) that it has failed or rebuilt, and the remote UE decides whether to release the connection with the relay UE and reselect other suitable cells or relay UEs to reestablish the connection.

[0177] In the cell switching method of this embodiment, the relay device receives the first switching signaling sent by the first network device; the relay device performs cell switching based on the first switching signaling; the relay device forwards the first information to the terminal or sends the second information to the terminal when accessing the first target cell after the switching; wherein the first information is obtained by the relay device receiving the information sent by the first network device, and the first information is used for the cell switching of the terminal; the second information is used to instruct the terminal to perform the cell switching. When the relay device completes the switching or the switching is successful, by forwarding the first information or sending the second information, the switching of the remote terminal is performed in a later association, thereby improving the cell switching effect of the SL relay architecture.

[0178] See also Figure 5 , Figure 5 is a flowchart of another cell switching method provided in an embodiment of the present application, which is used for a terminal, such as Figure 5 As shown, the method comprises the following steps:

[0179] The terminal receives the first information or the second information sent by the relay device;

[0180] The first information is used for cell switching of the terminal; and the second information is used to instruct the execution of switching signaling of the terminal.

[0181] Optionally, the first information is a switching signaling of the terminal; and the second information is used to trigger execution of the switching signaling of the terminal.

[0182] It should be noted that this embodiment is Figure 4 The implementation method of the corresponding cell switching method in the embodiment shown in the figure can be found in the specific implementation method. Figure 4 To avoid repeated description, the relevant descriptions in the illustrated embodiment will not be repeated in this embodiment.

[0183] The relay device forwards the first information to the terminal or sends the second information to the terminal when the access is to the first target cell after the handover, and the terminal receives the first information or the second information sent by the relay device. It can be understood that the terminal receives the first information or the second information sent by the relay device when the access is to the first target cell after the handover.

[0184] Optionally, the terminal receives first information sent by the relay device, including:

[0185] The terminal receives first information sent by the relay device through an SL RRC message;

[0186] The terminal receives first information sent by the relay device through the SL RLC channel.

[0187] In the present application embodiment, Figure 4 In the illustrated embodiment, the first information is forwarded to the terminal. Correspondingly, in the example of the present application, the terminal receives the first information sent by the relay device, including any one of the following: receiving the first information through a side link SL RRC message; receiving the first information through a side link SL RLC channel.

[0188] In the embodiment of the present application, the second information is indication information generated by the relay device, and the sending and receiving of the second information can adopt a conventional communication method between the relay device and the remote UE.

[0189] Optionally, the terminal receives the second information sent by the relay device, including:

[0190] The terminal receives first information sent by the relay device through an SL RRC message;

[0191] The terminal receives the first information sent by the relay device through the SL layer 2 instruction.

[0192] In this embodiment of the present application, the above-mentioned second information can be sent via SL RRC or SL L2 indication.

[0193] Optionally, when the terminal receives the second information sent by the relay device, the method further includes:

[0194] When the terminal receives the second information and the fourth information, the terminal performs a cell switching corresponding to the fourth information; wherein the fourth information includes a switching signaling sent by the first network device to the terminal.

[0195] In the embodiment of the present application, corresponding Figure 4 In the second embodiment, the switching signaling (fourth information) of the terminal is sent by the first network device to the terminal, wherein the fourth information can be sent by the first network device directly to the terminal (in a multipath scenario), or the first network device can forward the fourth information to the terminal through a relay device. In the forwarding mode, different from Figure 4 For the first information in the first embodiment, the relay device does not need to cache the fourth information but directly forwards it. There is no fixed sequence in which the fourth information and the second information are sent, that is, the second information may be received before or after the fourth information. The terminal starts to execute the cell switching corresponding to the fourth information only when both the second information and the fourth information have been received, for example, switching to the second target cell, wherein the second target cell and the first target cell are the same cell or different cells, and the first target cell and the second target cell belong to the same target node.

[0196] In an optional implementation manner, the target cells of the Remote UE and the relay device may also be controlled by different nodes.

[0197] When the terminal receives the fourth information but does not receive the second information indication, the terminal may cache the fourth information first, and start to execute the switching only when the second information indication is received.

[0198] Optionally, the fourth information carries at least one of a second identifier and relay link configuration information, wherein the second identifier is used to identify that the fourth information is executed in response to the second information.

[0199] In the embodiment of the present application, the second identifier can be understood as an explicit group switching identifier, and the relay link configuration information (relay link configuration) implicitly indicates the group switching. In the case of explicit or implicit indication of group switching, the remote UE is triggered to execute the switching command (fourth information) of the remote UE after the relay device is successfully switched by sending the second information. For the relay UE, getting an explicit or implicit indication means that it has completed the successful access to the target cell or successfully returned the completion signaling, and needs to notify the remote UE. For the remote UE, getting an explicit or implicit indication means that the switching command (fourth information) cannot be executed immediately, but needs to wait for the explicit notification of the relay UE before executing it.

[0200] Optionally, the method further includes: upon receiving third information sent by the relay device, the terminal determines whether to release the connection with the relay device, wherein the third information is used to indicate that the relay device has failed to perform a cell handover or to perform an RRC reconstruction.

[0201] In the case of cell handover failure, the relay device may notify the remote UE of the cell handover failure or RRC reestablishment, so that the remote UE can choose to release the connection or maintain the connection.

[0202] Optionally, the relay device is connected to the terminal in any of the following ways: PC5, Bluetooth, ideal backhaul, and wireless local area network WLAN.

[0203] Optionally, before the terminal receives the first information or the second information sent by the relay device, the method further includes at least one of the following:

[0204] The terminal sends a second sub-measurement result to the relay device;

[0205] The terminal sends the second measurement result to the first network device.

[0206] In the embodiment of the present application, the terminal can send the second measurement result to the first network device. The sending method can be to send it directly to the first network device through a direct link, or to forward it to the first network device through a relay device. In this forwarding process, the second measurement result is independently forwarded to the first network device without being associated with the measurement result of the relay device. The second sub-measurement result needs to be associated with the measurement result of the relay device. The terminal can also send the second sub-measurement result to the first network device. The reporting of the second sub-measurement result can refer to Figure 4 The embodiment shown.

[0207] It should be noted that this embodiment is Figure 4 The implementation method of the corresponding cell switching method in the embodiment shown in the figure can be found in the specific implementation method. Figure 4 All implementations in the illustrated embodiments are applicable to this embodiment and can achieve the same or similar beneficial effects. To avoid repeated description, this embodiment will not be described in detail.

[0208] See also Figure 6 , Figure 6 is a flowchart of another cell switching method provided in an embodiment of the present application, which is used for a first network device, such as Figure 6 As shown, the method comprises the following steps:

[0209] Step 601: The first network device performs a handover signaling sending operation, where the handover signaling sending operation includes at least one of the following:

[0210] The first network device sends a first switching signaling and a first message to the relay device;

[0211] The first network device sends a first switching signaling to the relay device;

[0212] The first network device sends fourth information to the terminal;

[0213] The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

[0214] It should be noted that this embodiment is Figure 4-5 The implementation method of the corresponding cell switching method in the embodiment shown in the figure can be found in the specific implementation method. Figure 4-5 To avoid repeated description, the relevant descriptions in the illustrated embodiment will not be repeated in this embodiment.

[0215] In the embodiment of the present application, the first network device configures handover signaling for the relay device and the terminal respectively, wherein the handover signaling configured for the relay device is the first handover signaling, and the handover signaling configured for the terminal is the first information or the fourth information. The first handover signaling is sent by the first network device to the relay device via the Uu interface; the difference between the first information and the fourth information is that the first information is forwarded to the terminal via the relay device, wherein the specific method of forwarding is referred to in Figure 4 The fourth information may be sent directly to the terminal by the first network device, or may be forwarded to the terminal through a relay device. The forwarding of the fourth information is different from the forwarding of the first information. The relay device does not need to cache the fourth information, nor does it need to wait for an appropriate time to forward it. The relay device directly forwards the fourth information upon receiving it. The relationship between the fourth information and the second information can be seen in Figure 5 The description of the illustrated embodiment will not be repeated in this embodiment. The fourth information can be understood as a handover signaling that does not need to be transferred, or needs to be transferred but does not need to be cached.

[0216] In the embodiment of the present application, all the switching commands, i.e., the switching command to the relay device (first switching signaling) or the switching command to the remote UE (first information or fourth information), include the associated configuration of the relay link, which is different from the switching command under the existing SL relay architecture. Regarding the associated configuration of the relay link, please refer to the related description of the relay link configuration information and relay link configuration in the embodiments shown in 4-5 above, which will not be repeated here.

[0217] Optionally, the switching command sent by the source node to the remote UE and the switching command sent to the relay UE can be sent together. After receiving these switching commands, the relay node first performs switching according to its own target configuration information, and caches the switching command sent to the remote UE. After the relay UE successfully completes the switching, the switching command of the remote UE is sent to the remote UE or a switching indication is sent to the remote UE, so that the remote UE performs the switching.

[0218] Optionally, when the first network device sends a first switching signaling and a first information to a relay device, the first information and the first switching signaling are sent through the same signaling, or the first information and the first switching signaling are sent through different signaling, or the first information and the first switching signaling are sent through the same transmission pipeline, or the first information and the first switching signaling are sent through different transmission pipelines.

[0219] Optionally, the first network device sending the first information to the relay device includes:

[0220] The first network device sends the first information to the relay device through a signaling radio bearer SRB1;

[0221] The first network device sends the first information to the relay device through the Uu RLC channel.

[0222] In the embodiment of the present application, the specific manner in which the first network device sends the first switching signaling and the first information can be found in Figure 4 The description of the illustrated embodiment will not be repeated in this embodiment.

[0223] Optionally, before the first network device performs the switching signaling sending operation, the method further includes:

[0224] The first network device sends the switching request to the second network device;

[0225] The first network device receives a switching request response sent by the second network device.

[0226] In the embodiment of the present application, the first network device may negotiate the switching configuration with the second network device before configuring the switching signaling for the relay device and the terminal, and the negotiation process is completed through the switching request and switching request response process.

[0227] It can be understood that when the source cell determines that the relay device and the remote UE can perform group switching together, if the source cell and the target cell are under the control of the same base station or CU (Central Unit) node, the configuration of the target cell can be determined through the internal processing of the gNB or CU; if the source cell and the target cell are located under the control of different base stations or CU nodes, it is necessary to use the interface between the base stations (for example, gNB), such as the Xn interface, to carry out the switching preparation process for the group switching between the source node and the target node to complete the group switching negotiation and configuration.

[0228] When the source cell (first network device) and the target cell (second network device) negotiate and decide to perform group handover on a UE group consisting of a relay device (relay UE) and one or more terminals (remote UE), the handover information of the relay UE and the associated remote UE will be correlated, that is, the relay UE and the remote UE will be switched to the same or related target cell together, and the relay link will still be configured in the target cell. The E2E (end-to-end) bearer of the remote UE is still mapped and transmitted through the Uu RLC channel and SL RLC channel of the relay UE. Therefore, the RRC reconfiguration message carrying the handover information needs to arrive in a certain order and be executed by each UE. The specific execution order can be referred to Figure 4-5 The embodiment shown is an implementation method of the corresponding cell switching method.

[0229] Optionally, the handover request includes a first handover request, and the first handover request includes handover information of the relay device and at least one terminal;

[0230] The handover request response includes a first handover request response, wherein the first handover request response includes a handover configuration of the relay device and at least one terminal;

[0231] Alternatively, the handover request includes a second handover request and at least one third handover request, the second handover request includes handover information of the relay device, and each third handover request corresponds to handover information of a terminal;

[0232] The handover request response includes a second handover request response and at least one third handover request response, the second handover request response includes a handover configuration of the relay device, and each of the third handover request responses includes a handover configuration of a terminal.

[0233] In an embodiment of the present application, if a group of UEs that undergo group handover, for example, a relay UE and one or more remote UEs, need to be switched from a source base station to a target base station, the source base station and the target base station need to perform a handover preparation process (Handover Preparation) to exchange information between the two nodes. The source base station sends at least one of the current configuration, demand information, association information, and measurement result information of the UE to the target base station (for example, through HandoverRequest), and the target base station uniformly accepts and configures these UEs and forms a configuration on the target side. The target node sends the configuration information of all UEs to the source node (for example, through HandoverRequest Acknowledge), and the source node sends a handover command to the relay UE and the remote UE. Among them, the association relationship may include, for example, the remote UE data is transferred through the relay UE, the end-to-end bearer of the remote UE, and the mapping relationship between the relay UE Uu RLC channel and the SL RLC channel.

[0234] In traditional UE switching, each switching preparation process is only for one UE, that is, the Handover Request carries the configuration and service requirements of the UE, and the Handover Request Acknowledge returned by the target base station also only contains the acceptance status and new configuration of this UE. If there is a relay UE and N remote UEs, then N+1 independent Handover Preparation processes are required to complete the switching process of these UEs respectively. Moreover, when the relay UE itself is in the process of switching, the N remote UEs under it cannot directly switch to the relay UE of the target base station, because the relay UE itself has not successfully completed the access to the target base station, which may cause remote UE data interruption and poor experience.

[0235] In the embodiment of the present application, if the source base station determines that the relay device and the remote UE perform group switching according to the measurement result (the judgment method can refer to Figure 4The source node may decide to perform a group mobility process for the relay device and the remote UE, that is, the source node and the target node uniformly perform a Handover Preparation process for this group of UEs (one relay UE and N remote UEs), thereby ensuring that the subsequent RRC reconfiguration message carrying the switching information can reach the UEs in each group in the correct order or be executed in the UEs in each group in the correct order, thereby improving the switching efficiency and experience.

[0236] It is understandable that when interacting between network devices (base stations), the measurement result information of the Uu interface and / or SL interface of each UE can also be carried. Although the source base station recommends the configuration and association relationship of each UE, the target node can also choose a configuration and association relationship different from the source base station based on its own situation and algorithm.

[0237] Optionally, when the target node receives the Handover Request message of the group handover, it accepts the group of UEs and uniformly configures the group of UEs, and can generate a Handover Request Acknowledge message, carrying the respective configurations of 1+N UEs, which can still include information about the remote UE data being transferred through the relay UE, the mapping relationship between the end-to-end bearer of the remote UE and the relay UE Uu RLC channel and PC5 RLC channel, etc. Among them, a group of UEs are uniformly accepted and configured, which may include rejecting some UEs or the bearers of some UEs.

[0238] Optionally, the source node still sends a Handover Request message to each UE separately, carrying the switching information of each UE in this group, which can also carry that this is one of the group switching processes and the association with other Handover Request messages. For example, if the group switching includes a total of N+1 processes, each process carries a sequence number, and the total number of sequences or a sequence end marker and other information to indicate the association relationship between this group of UEs. The switching information of each UE can also carry their association information, such as the remote UE data being transferred through the relay UE, the end-to-end bearer of the remote UE and the mapping relationship between the relay UE Uu RLC channel and the PC5 RLC channel, etc.

[0239] When the target node receives multiple Handover Request messages of group switching, it processes these messages uniformly, accepts this group of UEs, and uniformly configures this group of UEs, and can generate N+1 HandoverRequest Acknowledge messages (Request and Acknowledge correspond one to one), carrying the respective configurations of 1+N UEs, wherein each Handover Request Acknowledge message can still contain information about the remote UE data being transferred through the relayUE, the mapping relationship between the end-to-end bearer of the remote UE and the relay UE Uu RLC channel and PC5 RLCchannel, etc. Among them, the unified configuration of this group of UEs may include rejecting certain UEs or the bearers of certain UEs.

[0240] Both of the above two methods realize that the source node informs the target node of the configuration and associated information of the group UE, and the target node performs unified acceptance and configuration, and finally generates an associated configuration for each UE.

[0241] Optionally, the switching request further includes an association relationship between the relay device and at least one terminal, where the association relationship includes at least one of the following:

[0242] The terminal data is transferred via the relay device;

[0243] End-to-end bearer of the terminal;

[0244] A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal;

[0245] A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal;

[0246] A mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer;

[0247] Optionally, the handover request response includes at least one of the following:

[0248] The terminal data is transferred via the relay device;

[0249] End-to-end bearer of the terminal;

[0250] A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal;

[0251] A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal;

[0252] The mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer.

[0253] In the embodiment of the present application, the source node receives the configuration information of N+1 UEs from the target node, and generates an RRC Reconfiguration message carrying the switching information from the configuration information of each UE, and sends it to each UE respectively. The distribution order of the RRC Reconfiguration message carrying the switching information of each UE can refer to the following in the case of method 1: Figure 4-5 In the embodiment, the sending order of the first switching message and the first message ensures that the group of UEs can access the target cell in a correct order, thereby re-completing the connection and data transmission in the target cell.

[0254] Optionally, the first handover request response or the third handover request response includes a first handover configuration of at least one terminal; the first handover configuration indicates that the corresponding terminal is directly connected to the second target cell.

[0255] In an embodiment of the present application, when interacting between base stations, measurement result information of the Uu interface and / or PC5 interface of each UE may also be carried. Although the source base station recommends the configuration and association relationship of each UE, the target node may also select a configuration and association relationship different from that of the source base station based on its own situation and algorithm. For example, a remote UE accesses the network through a relay UE at the source base station. When the target base station generates the configuration, the remote UE may be directly switched to a directly connected target node, and so on.

[0256] Optionally, the source node generates reconfiguration information carrying handover signaling according to the final configuration of the target node, so that each UE can perform handover reconfiguration. It should be noted that if a remote UE is switched to a common UE directly connected to a network node, the UE does not need to wait for the handover of the relay UE to be completed before performing the handover, and it can directly switch itself. The source cell does not need to indicate the handover information of the UE to the relay UE so that the relay UE caches the handover command, but can directly send the handover command, which can be understood as forwarding without caching.

[0257] Optionally, before the first network device sends the switching request to the second network device, the method further includes at least one of the following:

[0258] The first network device receives a first measurement result sent by the relay device;

[0259] The first network device receives a second measurement result sent by the terminal;

[0260] The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0261] In the embodiment of the present application, the reporting of the above measurement results can refer to Figure 4-5 The embodiment shown is an implementation method of the corresponding cell switching method.

[0262] Optionally, before the first network device performs the switching signaling sending operation, the method further includes:

[0263] The first network device performs a measurement result receiving operation,

[0264] The first network device determines the handover signaling based on the measurement result;

[0265] The measurement result receiving operation includes at least one of the following:

[0266] receiving a first measurement result sent by the relay device;

[0267] receiving a second measurement result sent by the terminal;

[0268] The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0269] Optionally, the first network device determines the handover signaling based on the measurement result, and the method includes:

[0270] The first network device determines a handover request based on the measurement result;

[0271] The first network device sends the switching request to the second network device;

[0272] The first network device receives a switching request response sent by the second network device;

[0273] The handover signaling is generated based on the handover request response.

[0274] The generating the handover signaling based on the handover request response includes:

[0275] Based on the first handover request response, a first handover signaling and at least one first information are generated respectively; or based on the second handover request response and at least one third handover request response, a first handover signaling and at least one first information are generated respectively.

[0276] It can be understood that the above-mentioned handover negotiation process or handover signaling generation process does not necessarily require the measurement result, and can also be performed independently of the measurement result. The above-mentioned optional manner only exemplifies the execution of the handover request based on the measurement result.

[0277] Optionally, the second network device includes a plurality of network devices, and the generating the handover signaling based on the handover request response includes:

[0278] Determine a target network device in the second network device based on the handover request response;

[0279] Generate a switching signaling corresponding to the target network device.

[0280] In the embodiment of the present application, some unsuccessful situations may occur during the group switching process. Since a group of UEs are involved, it is different from the abnormal handling of the normal switching of a single UE. For the interface processing between base stations, some UEs or some bearers of UEs may not be accepted by the target node. This is similar to the traditional acceptance. The source node will compare the potential acceptance from different target nodes (candidate target nodes) and select the target node with better acceptance. The UE or UE bearer that cannot be accepted by the target node can be released as a processing, and the switching process continues for other UEs and bearers that are successfully accepted.

[0281] It should be noted that this embodiment is Figure 4-5 The implementation method of the corresponding cell switching method in the embodiment shown in the figure can be found in the specific implementation method. Figure 4-5 All implementations in the illustrated embodiments are applicable to this embodiment and can achieve the same or similar beneficial effects. To avoid repeated description, this embodiment will not be described in detail.

[0282] See also Figure 7 , Figure 7 is a flowchart of another cell switching method provided in an embodiment of the present application, which is used for a first network device, such as Figure 7 As shown, the method comprises the following steps:

[0283] Step 701: The second network device receives a switching request sent by the first network device;

[0284] Step 702: The second network device sends a switching request response to the first network device;

[0285] The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

[0286] Optionally, the handover request response includes a first handover request response, where the first handover request response includes a handover configuration of the relay device and at least one terminal;

[0287] Alternatively, the handover request response includes a second handover request response and at least one third handover request response, the second handover request response includes a handover configuration of the relay device, and each of the third handover request responses includes a handover configuration of a terminal.

[0288] Optionally, the first handover request response or the third handover request response includes a first handover configuration of at least one terminal; the first handover configuration indicates that the corresponding terminal is directly connected to the second target cell.

[0289] Optionally, the handover request response includes at least one of the following:

[0290] The terminal data is transferred via the relay device;

[0291] End-to-end bearer of the terminal;

[0292] A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal;

[0293] A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal;

[0294] The mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer.

[0295] It should be noted that this embodiment is Figure 4-6 The implementation method of the corresponding cell switching method in the embodiment shown in the figure can be found in the specific implementation method. Figure 4-6 All implementations in the illustrated embodiments are applicable to this embodiment and can achieve the same or similar beneficial effects. To avoid repeated description, this embodiment will not be described in detail.

[0296] The embodiments of the present application provide Figure 4 The method of the embodiment shown in the figure can be executed by a relay device. Figure 4 The method of the illustrated embodiment is taken as an example to illustrate the apparatus of the relay device provided in the embodiment of the present application.

[0297] The relay device comprises:

[0298] A first receiving module is used to receive a first switching signaling sent by a first network device;

[0299] A first switching module, configured to perform cell switching based on the first switching signaling;

[0300] A first sending module, configured to forward first information to the terminal or send second information to the terminal when accessing the first target cell after the handover;

[0301] The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

[0302] Optionally, the relay device further includes:

[0303] A fourth receiving module, configured to receive first information sent by the first network device;

[0304] A cache module, used for caching the first information;

[0305] The first information and the first switching signaling are sent through the same signaling, or the first information and the first switching signaling are sent through different signaling, or the first information and the first switching signaling are sent through the same transmission channel, or the first information and the first switching signaling are sent through different transmission channels.

[0306] Optionally, the fourth receiving module includes any of the following items:

[0307] A first receiving submodule, configured to receive first information sent by the first network device through a signaling radio bearer SRB1;

[0308] A second receiving submodule, configured to receive the first information sent by the first network device through a Uu interface radio link control RLC channel;

[0309] Optionally, the first sending module includes any one of the following items:

[0310] A first sending submodule, configured to forward the first information to the terminal via a side link SL radio resource control RRC message;

[0311] The second sending submodule is used to forward the first information to the terminal through the SL RLC channel.

[0312] Optionally, the first information is sent in a container manner.

[0313] Optionally, when the relay device receives the first information sent by the first network device through the Uu interface wireless link control RLC channel, the first information carries a first identifier, wherein the first identifier is used to identify that the first information needs to be cached or to identify the type of the first information.

[0314] Optionally, the relay device further includes:

[0315] A deleting module, used to delete the first cached information;

[0316] The fourth sending module is used to send third information to the terminal, where the third information is used to indicate that the relay device fails to perform cell switching or performs RRC reconstruction.

[0317] Optionally, the first sending module includes:

[0318] The third sending submodule is used for, when the first switching signaling carries a second identifier or relay link configuration information and the relay device accesses the first target cell after the switching, the relay device sending the second information to the terminal.

[0319] The second identifier is used to instruct the relay device to send the second information to the terminal when accessing the first target cell after the handover.

[0320] Optionally, the fourth sending module is used for the relay device to send third information to the terminal when a cell switching fails, and the third information is used to instruct the relay device to execute a cell switching failure or perform RRC reconstruction.

[0321] The first sending module includes any one of the following:

[0322] A fourth sending submodule, configured to send the second information to the terminal through an SL RRC message;

[0323] The fifth sending submodule is used to send the second information to the terminal through the SL layer 2 instruction.

[0324] Optionally, the first switching signaling carries relay link configuration information, and the terminal is a terminal corresponding to the relay link configuration information.

[0325] Optionally, the relay device is connected to the terminal in any of the following ways: PC5, Bluetooth, ideal backhaul, and wireless local area network WLAN.

[0326] Optionally, the relay device further includes:

[0327] A fifth sending module, configured to send the first measurement result to the first network device;

[0328] The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0329] Optionally, the fifth sending module includes:

[0330] The sixth sending submodule is used to send a first measurement result to the first network device when the Uu measurement event is met; the first measurement result includes the first sub-measurement result of the relay device and the second sub-measurement result of the terminal.

[0331] Optionally, the relay device further includes at least one of the following:

[0332] A fifth receiving module, configured for the relay device to receive a second sub-measurement result sent by the terminal through the SL RRC;

[0333] The sixth receiving module is used for the relay device to receive the second sub-measurement result sent by the terminal through the SL RLC channel.

[0334] Optionally, in the case of a second sub-measurement result sent by the receiving terminal through the SL RLC channel, the second sub-measurement result carries a third identifier, wherein the third identifier is used to identify that the second sub-measurement result needs to be sent together with the first sub-measurement result or to identify the type of the second sub-measurement result.

[0335] Optionally, the situation of the relay device in the first target cell after access switching includes any one of the following situations: the relay device randomly accesses successfully, the relay device RRC reconfiguration completion signaling is sent, and the relay device RRC reconfiguration completion signaling is sent successfully.

[0336] The relay device in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. Exemplarily, the terminal may include but is not limited to the types of the terminal 11 listed above, and other devices may be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0337] The relay device provided in the embodiment of the present application can achieve Figure 4-7 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0338] The embodiments of the present application provide Figure 5 The method of the embodiment shown in the figure can be executed by a terminal. Figure 5 The method of the illustrated embodiment is taken as an example to illustrate the terminal device provided by the embodiment of the present application.

[0339] The terminal comprises:

[0340] A second receiving module, used to receive the first information or the second information sent by the relay device;

[0341] The first information is used for cell switching of the terminal; and the second information is used to instruct the execution of switching signaling of the terminal.

[0342] Optionally, the first information is a switching signaling of the terminal;

[0343] The second information is used to trigger the execution of handover signaling of the terminal.

[0344] Optionally, when the terminal receives the second information sent by the relay device, the terminal further includes:

[0345] A second switching module, configured to, when the terminal receives the second information and the fourth information, cause the terminal to perform a cell switching corresponding to the fourth information;

[0346] The fourth information includes a switching signaling sent by the first network device to the terminal.

[0347] Optionally, the fourth information carries at least one of a second identifier and relay link configuration information, wherein the second identifier is used to identify that the fourth information is executed in response to the second information or to identify a type of the fourth information.

[0348] Optionally, the terminal further includes:

[0349] A release module is used for the terminal to determine whether to release the connection with the relay device when receiving third information sent by the relay device, wherein the third information is used to indicate that the relay device fails to perform a cell handover or performs an RRC reconstruction.

[0350] Optionally, the relay device is connected to the terminal in any of the following ways: PC5, Bluetooth, ideal backhaul, and wireless local area network WLAN.

[0351] Optionally, the second receiving module includes:

[0352] A third receiving submodule, configured to receive first information sent by the relay device via an SL RRC message;

[0353] The fourth receiving submodule is used to receive the first information sent by the relay device through the SL RLC channel.

[0354] Optionally, the second receiving module includes:

[0355] A fifth receiving submodule, configured to receive first information sent by the relay device through an SL RRC message;

[0356] The sixth receiving submodule is used to receive the first information sent by the relay device through the SL layer 2 instruction.

[0357] Optionally, the terminal further includes:

[0358] A sixth sending module, configured to send the second sub-measurement result to the relay device;

[0359] The sixth sending module is used to send the second measurement result to the first network device.

[0360] The terminal in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device, such as an integrated circuit or a chip. The electronic device may be a terminal, or may be other devices other than a terminal. Exemplarily, the terminal may include but is not limited to the types of terminal 11 listed above, and other devices may be servers, network attached storage (NAS), etc., which are not specifically limited in the embodiment of the present application.

[0361] The terminal provided in the embodiment of the present application can achieve Figure 4-7 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0362] The embodiments of the present application provide Figure 6 The method of the embodiment shown in the figure can be executed by the first network device. Figure 6 The method of the illustrated embodiment is taken as an example to illustrate the apparatus of the first network device provided in the embodiment of the present application.

[0363] The first network device comprises:

[0364] The second sending module is configured to perform a handover signaling sending operation, wherein the handover signaling sending operation includes at least one of the following:

[0365] The first network device sends a first switching signaling and a first message to the relay device;

[0366] The first network device sends a first switching signaling to the relay device;

[0367] The first network device sends fourth information to the terminal;

[0368] The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

[0369] Optionally, when the first network device sends a first switching signaling and a first information to a relay device, the first information and the first switching signaling are sent through the same signaling, or the first information and the first switching signaling are sent through different signaling, or the first information and the first switching signaling are sent through the same transmission pipeline, or the first information and the first switching signaling are sent through different transmission pipelines.

[0370] Optionally, the first network device sending the first information to the relay device includes:

[0371] The first network device sends the first information to the relay device through SRB1;

[0372] The first network device sends the first information to the relay device through the Uu RLC channel.

[0373] Optionally, the first network device includes:

[0374] A seventh sending module, configured to send the switching request to the second network device;

[0375] A seventh receiving module is used to receive a switching request response sent by the second network device.

[0376] Optionally, the first network device further includes at least one of the following:

[0377] an eighth receiving module, configured to receive a first measurement result sent by the relay device;

[0378] A ninth receiving module, configured to receive a second measurement result sent by the terminal;

[0379] The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

[0380] Optionally, the handover request includes a first handover request, and the first handover request includes handover information of the relay device and at least one terminal;

[0381] The handover request response includes a first handover request response, wherein the first handover request response includes a handover configuration of the relay device and at least one terminal;

[0382] Alternatively, the handover request includes a second handover request and at least one third handover request, the second handover request includes handover information of the relay device, and each third handover request corresponds to handover information of a terminal;

[0383] The handover request response includes a second handover request response and at least one third handover request response, the second handover request response includes a handover configuration of the relay device, and each of the third handover request responses includes a handover configuration of a terminal.

[0384] Optionally, the switching request further includes an association relationship between the relay device and at least one terminal, where the association relationship includes at least one of the following:

[0385] The terminal data is transferred via the relay device;

[0386] End-to-end bearer of the terminal;

[0387] A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal;

[0388] A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal;

[0389] A mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer;

[0390] Alternatively, the handover request response includes at least one of the following:

[0391] The terminal data is transferred via the relay device;

[0392] End-to-end bearer of the terminal;

[0393] A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal;

[0394] A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal;

[0395] The mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer.

[0396] Optionally, the first handover request response or the third handover request response includes a first handover configuration of at least one terminal; the first handover configuration indicates that the corresponding terminal is directly connected to the second target cell.

[0397] The first network device provided in the embodiment of the present application can achieve Figure 4-7 The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0398] The embodiments of the present application provide Figure 7 The method of the embodiment shown in the figure can be executed by the second network device. Figure 7The method of the illustrated embodiment is taken as an example to illustrate the second network device provided in the embodiment of the present application.

[0399] The second network device comprises:

[0400] A third receiving module, configured to receive a switching request sent by the first network device;

[0401] A third sending module, configured to send a switching request response to the first network device;

[0402] The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

[0403] Optionally, the handover request response includes a first handover request response, where the first handover request response includes a handover configuration of the relay device and at least one terminal;

[0404] Alternatively, the handover request response includes a second handover request response and at least one third handover request response, the second handover request response includes a handover configuration of the relay device, and each of the third handover request responses includes a handover configuration of a terminal.

[0405] Optionally, the first handover request response or the third handover request response includes a first handover configuration of at least one terminal; the first handover configuration indicates that the corresponding terminal is directly connected to the second target cell.

[0406] Optionally, the handover request response includes at least one of the following:

[0407] The terminal data is transferred via the relay device;

[0408] End-to-end bearer of the terminal;

[0409] A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal;

[0410] A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal;

[0411] The mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer.

[0412] The second network device in the embodiment of the present application may be an electronic device, such as an electronic device with an operating system, or a component in an electronic device. The second network device provided in the embodiment of the present application can implement Figure 4-7The various processes implemented by the method embodiment and achieving the same technical effect are not described here to avoid repetition.

[0413] like Figure 8 As shown, the embodiment of the present application further provides a communication device 800, including a processor 801 and a memory 802, the memory 802 stores a program or instruction that can be run on the processor 801, for example, when the communication device 800 is a relay device, the program or instruction is executed by the processor 801 to implement the above Figure 4 When the communication device 800 is a terminal, the program or instruction is executed by the processor 801 to implement the above Figure 5 When the communication device 800 is a network side device, the program or instruction is executed by the processor 801 to implement the above Figure 6 or Figure 7 The various steps of the method embodiment can achieve the same technical effect, and will not be described again here to avoid repetition.

[0414] The embodiment of the present application also provides a relay device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 4 The steps in the method embodiment shown. The relay device embodiment corresponds to the above-mentioned relay device side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to the relay device embodiment and can achieve the same technical effect. Specifically, Fig. 9 A schematic diagram of the hardware structure of a relay device for implementing an embodiment of the present application.

[0415] The relay device 900 includes but is not limited to: a radio frequency unit 901, a network module 902, an audio output unit 903, an input unit 904, a sensor 905, a display unit 906, a user input unit 907, an interface unit 908, a memory 909 and at least some of the components of a processor 910.

[0416] Those skilled in the art will appreciate that the relay device 900 may also include a power source (such as a battery) for supplying power to each component, and the power source may be logically connected to the processor 910 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig. 9 The relay device structure shown in the figure does not constitute a limitation on the relay device. The relay device may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0417] It should be understood that in the embodiment of the present application, the input unit 904 may include a graphics processing unit (GPU) 9041 and a microphone 9042, and the graphics processor 9041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 906 may include a display panel 9061, and the display panel 9061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 907 includes a touch panel 9071 and at least one of other input devices 9072. The touch panel 9071 is also called a touch screen. The touch panel 9071 may include two parts: a touch detection device and a touch controller. Other input devices 9072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0418] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 901 can transmit the data to the processor 910 for processing; in addition, the RF unit 901 can send uplink data to the network side device. Generally, the RF unit 901 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0419] The memory 909 can be used to store software programs or instructions and various data. The memory 909 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 909 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 909 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0420] The processor 910 may include one or more processing units; optionally, the processor 910 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 910.

[0421] The radio frequency unit 901 is used to receive a first switching signaling sent by a first network device;

[0422] The processor 910 is configured to perform cell switching based on the first switching signaling;

[0423] The radio frequency unit 901 is further configured to forward the first information to the terminal or send the second information to the terminal when accessing the first target cell after the handover;

[0424] The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

[0425] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the method embodiment Figure 4 The relevant descriptions of the illustrated embodiments have achieved the same or corresponding technical effects and will not be repeated here to avoid repetition.

[0426] The embodiment of the present application also provides a terminal, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 5 The steps in the method embodiment shown. This terminal embodiment corresponds to the above-mentioned terminal side method embodiment, and each implementation process and implementation method of the above-mentioned method embodiment can be applied to this terminal embodiment and can achieve the same technical effect. Specifically, Fig.10 A schematic diagram of the hardware structure of a terminal for implementing an embodiment of the present application.

[0427] The terminal 1000 includes but is not limited to: a radio frequency unit 1001, a network module 1002, an audio output unit 1003, an input unit 1004, a sensor 1005, a display unit 1006, a user input unit 1007, an interface unit 1008, a memory 1009 and at least some of the components of a processor 1010.

[0428] Those skilled in the art will appreciate that the terminal 1000 may also include a power source (such as a battery) for supplying power to various components, and the power source may be logically connected to the processor 1010 through a power management system, thereby implementing functions such as managing charging, discharging, and power consumption management through the power management system. Fig.10 The terminal structure shown in the figure does not constitute a limitation on the terminal. The terminal may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently, which will not be described in detail here.

[0429] It should be understood that in the embodiment of the present application, the input unit 1004 may include a graphics processing unit (GPU) 10041 and a microphone 10042, and the graphics processor 10041 processes the image data of a static picture or video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1006 may include a display panel 10061, and the display panel 10061 may be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1007 includes a touch panel 10071 and at least one of other input devices 10 072. The touch panel 10071 is also called a touch screen. The touch panel 10071 may include two parts: a touch detection device and a touch controller. Other input devices 10072 may include, but are not limited to, a physical keyboard, function keys (such as volume control keys, switch keys, etc.), a trackball, a mouse, and a joystick, which will not be repeated here.

[0430] In the embodiment of the present application, after receiving downlink data from the network side device, the RF unit 1001 can transmit the data to the processor 1010 for processing; in addition, the RF unit 1001 can send uplink data to the network side device. Generally, the RF unit 1001 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0431] The memory 1009 can be used to store software programs or instructions and various data. The memory 1009 may mainly include a first storage area for storing programs or instructions and a second storage area for storing data, wherein the first storage area may store an operating system, an application program or instruction required for at least one function (such as a sound playback function, an image playback function, etc.), etc. In addition, the memory 1009 may include a volatile memory or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDRSDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synchronous link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 1009 in the embodiment of the present application includes but is not limited to these and any other suitable types of memory.

[0432] The processor 1010 may include one or more processing units; optionally, the processor 1010 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface, and application programs, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It is understandable that the modem processor may not be integrated into the processor 1010.

[0433] The radio frequency unit 1001 is used to receive the first information or the second information sent by the relay device;

[0434] The first information is used for cell switching of the terminal; and the second information is used to instruct the execution of switching signaling of the terminal.

[0435] It can be understood that the implementation process of each implementation method mentioned in this embodiment can refer to the method embodiment Figure 5The related descriptions are the same or corresponding technical effects, and to avoid repetition, they will not be repeated here.

[0436] The embodiment of the present application also provides a network side device, including a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the following Figure 6 The steps of the method embodiment shown. This network side device embodiment corresponds to the above network side device method embodiment, and each implementation process and implementation mode of the above method embodiment can be applied to this network side device embodiment and can achieve the same technical effect.

[0437] Specifically, the embodiment of the present application also provides a network side device. Fig.11 As shown, the network side device 1100 includes: an antenna 111, a radio frequency device 112, a baseband device 113, a processor 114 and a memory 115. The antenna 111 is connected to the radio frequency device 112. In the uplink direction, the radio frequency device 112 receives information through the antenna 111 and sends the received information to the baseband device 113 for processing. In the downlink direction, the baseband device 113 processes the information to be sent and sends it to the radio frequency device 112, and the radio frequency device 112 processes the received information and sends it out through the antenna 111.

[0438] The method executed by the network-side device in the above embodiment may be implemented in the baseband device 113, which includes a baseband processor.

[0439] The baseband device 113 may include, for example, at least one baseband board on which a plurality of chips are arranged. Fig.11 As shown, one of the chips is, for example, a baseband processor, which is connected to the memory 115 through a bus interface to call the program in the memory 115 to execute the network device operations shown in the above method embodiment.

[0440] The network side device may further include a network interface 116, which is, for example, a Common Public Radio Interface (CPRI).

[0441] Specifically, the network side device 1100 of the embodiment of the present application also includes: instructions or programs stored in the memory 115 and executable on the processor 114. The processor 114 calls the instructions or programs in the memory 115 to execute the methods executed by the modules shown in the first network device or the second network device, and achieves the same technical effect. To avoid repetition, it will not be repeated here.

[0442] The embodiment of the present application also provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by a processor, the above Figure 4 Each process of the method embodiment, or the program or instruction is executed by the processor to implement the above Figure 5 Each process of the method embodiment, or the program or instruction is executed by the processor to implement the above Figure 6 Each process of the method embodiment, or the program or instruction is executed by the processor to implement the above Figure 7 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0443] The processor is the processor in the terminal described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk. In some examples, the readable storage medium may be a non-transient readable storage medium.

[0444] The present application also provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run a program or instruction to implement the above Figure 4 Each process of the method embodiment, or, to achieve the above Figure 5 Each process of the method embodiment, or to implement the above Figure 6 Each process of the method embodiment, or to implement the above Figure 7 The various processes of the method embodiments can achieve the same technical effect, and will not be described again here to avoid repetition.

[0445] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0446] The present application embodiment further provides a computer program / program product, wherein the computer program / program product is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement the above Figure 4 The various processes of the method embodiment shown in the embodiment, or the computer program / program product is executed by at least one processor to implement the above Figure 5 The various processes of the method embodiment shown in the embodiment, or the computer program / program product is executed by at least one processor to implement the above Figure 6 The various processes of the method embodiment shown in the embodiment, or the computer program / program product is executed by at least one processor to implement the above Figure 7 The various processes of the method embodiment shown in the embodiment can achieve the same technical effect. To avoid repetition, they will not be described again here.

[0447] An embodiment of the present application also provides a communication system, including: a relay device, a terminal, a first network device and a second network device, wherein the relay device can be used to execute the steps of the method described in the first aspect, the terminal can be used to execute the steps of the method described in the second aspect, the first network device can be used to execute the steps of the method described in the third aspect, and the second network device can be used to execute the steps of the method described in the fourth aspect.

[0448] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0449] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of a computer software product plus a necessary general hardware platform, and of course, can also be implemented by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, disk, CD, etc.), including several instructions to enable a terminal or a network-side device to execute the methods described in each embodiment of the present application.

[0450] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms of implementation methods without departing from the purpose of the present application and the scope of protection of the claims, and these implementation methods are all within the protection of the present application.

Claims

1. A cell switching method, characterized in that: include: The relay device receives a first switching signaling sent by the first network device; The relay device performs cell switching based on the first switching signaling; The relay device forwards the first information to the terminal or sends the second information to the terminal when accessing the first target cell after the handover; The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

2. The method according to claim 1, characterized in that When the relay device accesses the first target cell after the handover, before forwarding the first information to the terminal, the method further includes: The relay device receives the first information sent by the first network device; The relay device caches the first information; The first information and the first switching signaling are sent through the same signaling, or the first information and the first switching signaling are sent through different signaling, or the first information and the first switching signaling are sent through the same transmission channel, or the first information and the first switching signaling are sent through different transmission channels.

3. The method according to claim 2, characterized in that The relay device receives first information sent by the first network device, including any of the following: The relay device receives the first information sent by the first network device through the signaling radio bearer SRB1; The relay device receives the first information sent by the first network device through a Uu interface radio link control RLC channel; Alternatively, the forwarding of the first information to the terminal includes any one of the following: The relay device forwards the first information to the terminal via a side link SL radio resource control RRC message; The relay device forwards the first information to the terminal through the SL RLC channel.

4. The method according to claim 2 or 3, characterized in that: in, The first information is sent in a container manner.

5. The method according to claim 3, characterized in that: In the case where the relay device receives the first information sent by the first network device through the Uu interface radio link control RLC channel, the first information carries a first identifier, wherein the first identifier is used to identify that the first information needs to be cached or to identify the type of the first information.

6. The method according to any one of claims 2 to 5, characterized in that: The method further includes: when the relay device fails to switch the cell, performing at least one of the following operations: Deleting the first cached information; Sending third information to the terminal, where the third information is used to indicate that the relay device fails to perform a cell handover or performs an RRC reconstruction.

7. The method according to claim 1, characterized in that The relay device sends second information to the terminal when accessing the first target cell after the handover, including: When the first handover signaling carries the second identifier or relay link configuration information and the relay device accesses the first target cell after the handover, the relay device sends the second information to the terminal; The second identifier is used to instruct the relay device to send the second information to the terminal when accessing the first target cell after the handover.

8. The method according to claim 1 or 7, characterized in that: The method further comprises: In case of a cell handover failure, the relay device sends third information to the terminal, where the third information is used to instruct the relay device to execute a cell handover failure or to perform RRC reconstruction.

9. The method according to any one of claims 1, 7-8, characterized in that: The relay device sends the second information to the terminal, including any one of the following: The relay device sends the second information to the terminal through a SL RRC message; The relay device sends the second information to the terminal through an SL layer 2 instruction.

10. The method according to any one of claims 1 to 9, characterized in that The first switching signaling carries relay link configuration information, and the terminal is a terminal corresponding to the relay link configuration information.

11. The method according to any one of claims 1 to 10, characterized in that The relay device is connected to the terminal in any of the following ways: PC5, Bluetooth, ideal backhaul and wireless local area network WLAN.

12. The method according to any one of claims 1 to 11, characterized in that Before the relay device receives the first switching signaling sent by the first network device, the method further includes: The relay device sends the first measurement result to the first network device; The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

13. The method according to claim 12, characterized in that The relay device sends a first measurement result to the first network device, including: When a Uu measurement event is satisfied, a first measurement result is sent to a first network device; the first measurement result includes a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

14. The method according to claim 12 or 13, characterized in that In a case where the first measurement result includes the second sub-measurement result of the terminal, before the relay device sends the first measurement result to the first network device, the method further includes at least one of the following: The relay device receives a second sub-measurement result sent by the terminal through the SL RRC; The relay device receives the second sub-measurement result sent by the terminal through the SL RLC channel.

15. The method according to claim 14, characterized in that In the case of a second sub-measurement result sent by the receiving terminal through the SL RLC channel, the second sub-measurement result carries a third identifier, wherein the third identifier is used to identify that the second sub-measurement result needs to be sent together with the first sub-measurement result or to identify the type of the second sub-measurement result.

16. The method according to any one of claims 1 to 15, characterized in that The situation of the relay device accessing the first target cell after the handover includes any one of the following situations: The relay device is randomly accessed successfully; The relay device RRC reconfiguration completion signaling is sent; The relay device RRC reconfiguration completion signaling is sent successfully.

17. A cell switching method, characterized in that: include: The terminal receives the first information or the second information sent by the relay device; The first information is used for cell switching of the terminal; The second information is used to instruct the handover signaling execution of the terminal.

18. The method according to claim 17, characterized in that When the terminal receives the second information sent by the relay device, the method further includes: When the terminal receives the second information and the fourth information, the terminal performs a cell switching corresponding to the fourth information; The fourth information includes a switching signaling sent by the first network device to the terminal.

19. The method according to claim 18, characterized in that The fourth information carries at least one of a second identifier and relay link configuration information, wherein the second identifier is used to identify that the fourth information is executed in response to the second information or to identify a type of the fourth information.

20. The method according to any one of claims 17 to 19, characterized in that The method further comprises: Upon receiving third information sent by the relay device, the terminal determines whether to release the connection with the relay device, wherein the third information is used to indicate that the relay device has failed to perform a cell handover or to perform an RRC reconstruction.

21. The method according to any one of claims 17 to 20, characterized in that The relay device is connected to the terminal in any of the following ways: PC5, Bluetooth, ideal backhaul and wireless local area network WLAN.

22. The method according to any one of claims 17 to 21, characterized in that The terminal receives first information sent by the relay device, including: The terminal receives first information sent by the relay device through an SL RRC message; The terminal receives first information sent by the relay device through the SL RLC channel.

23. The method according to any one of claims 17 to 21, characterized in that The terminal receives second information sent by the relay device, including any of the following: The terminal receives first information sent by the relay device through an SL RRC message; The terminal receives the first information sent by the relay device through the SL layer 2 instruction.

24. The method according to any one of claims 17 to 23, characterized in that Before the terminal receives the first information or the second information sent by the relay device, the method further includes at least one of the following: The terminal sends a second sub-measurement result to the relay device; The terminal sends the second measurement result to the first network device.

25. A cell switching method, characterized in that: include: The first network device performs a handover signaling sending operation, where the handover signaling sending operation includes at least one of the following: The first network device sends a first switching signaling and a first message to the relay device; The first network device sends a first switching signaling to the relay device; The first network device sends fourth information to the terminal; The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

26. The method according to claim 25, characterized in that When the first network device sends the first switching signaling and the first information to the relay device, the first information and the first switching signaling are sent through the same signaling, or the first information and the first switching signaling are sent through different signaling, or the first information and the first switching signaling are sent through the same transmission channel, or the first information and the first switching signaling are sent through different transmission channels.

27. The method according to claim 25 or 26, characterized in that The first network device sending the first information to the relay device includes: The first network device sends the first information to the relay device through SRB1; The first network device sends the first information to the relay device through the Uu RLC channel.

28. The method according to any one of claims 25 to 27, characterized in that Before the first network device performs the switching signaling sending operation, the method further includes: The first network device sends the switching request to the second network device; The first network device receives a switching request response sent by the second network device.

29. The method according to claim 28, characterized in that Before the first network device sends the switching request to the second network device, the method further includes at least one of the following: The first network device receives a first measurement result sent by the relay device; The first network device receives a second measurement result sent by the terminal; The first measurement result includes at least one of the following: a first sub-measurement result of the relay device and a second sub-measurement result of the terminal.

30. The method according to claim 28 or 29, characterized in that The handover request includes a first handover request, wherein the first handover request includes handover information of the relay device and at least one terminal; The handover request response includes a first handover request response, wherein the first handover request response includes a handover configuration of the relay device and at least one terminal; Alternatively, the handover request includes a second handover request and at least one third handover request, the second handover request includes handover information of the relay device, and each third handover request corresponds to handover information of a terminal; The handover request response includes a second handover request response and at least one third handover request response, the second handover request response includes a handover configuration of the relay device, and each of the third handover request responses includes a handover configuration of a terminal.

31. The method according to claim 30, characterized in that The switching request also includes an association relationship between the relay device and at least one terminal, and the association relationship includes at least one of the following: The terminal data is transferred via the relay device; End-to-end bearer of the terminal; A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal; A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal; A mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer; Alternatively, the handover request response includes at least one of the following: The terminal data is transferred via the relay device; End-to-end bearer of the terminal; A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal; A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal; The mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer.

32. The method according to any one of claims 29 to 31, characterized in that The first handover request response or the third handover request response includes a first handover configuration of at least one terminal; the first handover configuration indicates that the corresponding terminal is directly connected to the second target cell.

33. A cell switching method, characterized in that: include: The second network device receives a switching request sent by the first network device; The second network device sends a switching request response to the first network device; The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

34. The method according to claim 33, characterized in that The handover request response includes a first handover request response, wherein the first handover request response includes a handover configuration of the relay device and at least one terminal; Alternatively, the handover request response includes a second handover request response and at least one third handover request response, the second handover request response includes a handover configuration of the relay device, and each of the third handover request responses includes a handover configuration of a terminal.

35. The method according to any one of claims 33, characterized in that The first handover request response or the third handover request response includes a first handover configuration of at least one terminal; the first handover configuration indicates that the corresponding terminal is directly connected to the second target cell.

36. The method according to any one of claims 33 to 35, characterized in that The handover request response includes at least one of the following: The terminal data is transferred via the relay device; End-to-end bearer of the terminal; A mapping relationship between the relay device Uu RLC channel and the end-to-end bearer of the terminal; A mapping relationship between the relay device SL RLC channel and the end-to-end bearer of the terminal; The mapping relationship between the terminal SL RLC channel and the terminal's end-to-end bearer.

37. A relay device, characterized in that: include: A first receiving module is used to receive a first switching signaling sent by a first network device; A first switching module, configured to perform cell switching based on the first switching signaling; A first sending module, configured to forward first information to the terminal or send second information to the terminal when accessing the first target cell after the handover; The first information is obtained by the relay device receiving information sent by the first network device, and the first information is used for cell switching of the terminal; the second information is used to instruct the terminal to perform cell switching.

38. A terminal, characterized in that: include: A second receiving module, used to receive the first information or the second information sent by the relay device; The first information is used for cell switching of the terminal; The second information is used to instruct the handover signaling execution of the terminal.

39. A first network device, characterized in that: include: The second sending module is configured to perform a handover signaling sending operation, wherein the handover signaling sending operation includes at least one of the following: The first network device sends a first switching signaling and a first message to the relay device; The first network device sends a first switching signaling to the relay device; The first network device sends fourth information to the terminal; The first switching signaling is a switching signaling for the relay device to switch to a first target cell, the first information is used for the cell switching of the terminal; and the fourth information is used for the cell switching of the terminal.

40. A second network device, characterized in that: include: A third receiving module, configured to receive a switching request sent by the first network device; A third sending module, configured to send a switching request response to the first network device; The switching request includes a first switching request, which includes switching information of the relay device and at least one terminal; or, the switching request includes a second switching request and at least one third switching request, wherein the second switching request includes switching information of the relay device, and each third switching request corresponds to switching information of a terminal.

41. A relay device, characterized in that: It comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the cell switching method according to any one of claims 1 to 16 are implemented.

42. A terminal, characterized in that: It comprises a processor and a memory, wherein the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the cell switching method as described in any one of claims 17 to 24 are implemented.

43. A network device, characterized in that: It includes a processor and a memory, the memory stores a program or instruction that can be run on the processor, and when the program or instruction is executed by the processor, the steps of the cell switching method as described in any one of claims 25 to 32 are implemented, or when the program or instruction is executed by the processor, the steps of the cell switching method as described in any one of claims 33 to 36 are implemented.

44. A readable storage medium, characterized in that The readable storage medium stores a program or instruction, and when the program or instruction is executed by the processor, it implements the cell switching method as described in any one of claims 1 to 16, or implements the steps of the cell switching method as described in any one of claims 17 to 24, or implements the steps of the cell switching method as described in any one of claims 25 to 32, or implements the steps of the cell switching method as described in any one of claims 33 to 36.

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