Communication method and related equipment

Abstract

The embodiment of the application provides a communication method and related equipment, the method comprises the following steps: a terminal device receives a conditional handover (CHO) command from a source base station, and the terminal device determines to switch from a source cell to a target cell according to the CHO command; when the terminal device fails in channel access LBT in the target cell, or succeeds in LBT in the target cell and fails in random access, the terminal device performs cell selection; and the terminal device sends first information to a network device, wherein the first information comprises a first parameter related to CHO failure caused by LBT failure in the target cell, or the first information comprises a second parameter related to CHO failure caused by LBT success in the target cell and random access failure. By using the application, the system performance can be improved.

Description

Technical Field

[0001] The present application relates to the field of wireless network technology, and in particular to a communication method and related equipment. Background Art

[0002] In the conditional handover (CHO) process, network parameters, such as handover parameters, are key factors directly affecting the handover success rate. Network devices adjust these parameters to improve handover success rates. A listen before talk (LBT) failure or a radio link failure (RLF) can cause the CHO process to fail. Because network devices cannot determine the cause of the CHO failure, they are unable to adjust network parameters, impacting system performance. Summary of the Invention

[0003] The embodiments of the present application provide a communication method and related equipment, which can improve system performance.

[0004] In a first aspect, an embodiment of the present application provides a communication method, including: a terminal device receives a conditional handover CHO command from a source base station, the CHO command includes information of multiple candidate cells, and the terminal device determines to switch from the source cell to the target cell according to the CHO command; when the terminal device fails to perform channel access LBT in the target cell, or succeeds in LBT and fails in random access in the target cell, the terminal device performs cell selection; the terminal device sends a first message to a network device, the first message includes a first parameter, the first parameter is related to the failure of CHO caused by the failure of LBT in the target cell, or the first message includes a second parameter, the second parameter is related to the failure of CHO caused by the success of LBT and failure of random access in the target cell. By reporting the first information to the network device, the network device can determine the cause of the CHO failure in the target cell according to the first information, and adjust the corresponding network parameters, thereby improving the performance of the system.

[0005] In one possible design, the first parameter includes at least one of the following: indication that the target cell meets execution conditions of the CHO command but LBT fails in the target cell, time period information from when the terminal device receives the CHO command to when the target cell is determined, and time period information from when the target cell is determined to when the terminal device fails to perform LBT in the target cell. The network device determines the reason for switching from the source cell to the target cell based on the first parameter, so as to adjust network parameters and thereby improve system performance.

[0006] In another possible design, the second parameter includes at least one of the following: indication information that the target cell meets the execution conditions of the CHO command and LBT is successfully performed in the target cell, indication information that the terminal device fails to randomly access the target cell, time period information from the terminal device receiving the CHO command to determining the target cell, time period information from determining the target cell to the terminal device successfully performing LBT in the target cell, and time period information from the terminal device successfully performing LBT in the target cell to the terminal device failing to randomly access the target cell. The network device determines the reason for switching from the source cell to the target cell through the second parameter, so as to adjust network parameters and thereby improve system performance.

[0007] In another possible design, after the terminal device fails in CHO in the target cell, the terminal device performs cell selection, and the cell selected by the terminal device is the first cell, which is one of the candidate cells. When LBT fails in the first cell, or LBT succeeds in the first cell and random access fails, the terminal device initiates a radio resource control RRC re-establishment process. When the terminal device fails to perform channel access LBT in the first cell, the first information also includes a third parameter, and the third parameter is related to the failure of CHO caused by the failure of LBT in the first cell; or when the terminal device succeeds in LBT in the first cell and random access fails, the first information also includes a fourth parameter, and the fourth parameter is related to the failure of CHO caused by the success of LBT in the first cell and random access failure. The terminal device initiates an RRC re-establishment process when CHO fails in the candidate cell, and reports the cause of the CHO failure so that the network device can adjust the network parameters, thereby improving the performance of the system.

[0008] In another possible design, the third parameter includes at least one of the following: indication information of the terminal device failing to perform LBT in the first cell, time period information from the terminal device starting to perform LBT in the first cell to the failure of LBT in the first cell, time period information from the terminal device failing to perform LBT in the first cell to the terminal device initiating an RRC re-establishment process, and time period information from the terminal device failing to perform LBT in the first cell to the terminal device sending the first information. The network device determines the cause of the CHO failure in the candidate cell through the third parameter, so as to adjust network parameters and thereby improve system performance.

[0009] In another possible design, the fourth parameter includes at least one of the following: indication information of the terminal device successfully performing LBT in the first cell, indication information of the terminal device failing random access in the first cell, time period information from the terminal device starting to perform LBT in the first cell to the terminal device successfully performing LBT in the first cell, time period information from the terminal device successfully performing LBT in the first cell to the terminal device failing random access in the first cell, time period information from the terminal device failing random access in the first cell to the terminal initiating an RRC re-establishment process, and time period information from the terminal device failing random access in the first cell to the terminal device sending the first information. The network device determines the cause of the CHO failure in the candidate cell through the fourth parameter, so as to adjust the network parameters and thus improve the performance of the system.

[0010] In another possible design, after the terminal device fails in CHO in the target cell, the terminal device performs cell selection, and the cell selected by the terminal device is the second cell, which is one of the candidate cells. The cell selected by the terminal device is the second cell, which is one of the candidate cells. When the terminal device successfully performs LBT and random access in the second cell, the terminal device switches to the second cell. The first information also includes a fifth parameter, and the fifth parameter is related to the success of CHO caused by the successful LBT and random access of the terminal device in the second cell. By reporting the reason for CHO success when CHO in the candidate cell is successful, the network device can adjust the network parameters, thereby improving the performance of the system.

[0011] In another possible design, the fifth parameter includes at least one of the following: indication information that the terminal device successfully performs LBT in the second cell, indication information that the terminal device successfully performs random access in the second cell, time period information from when the terminal device starts performing LBT in the second cell to when the terminal device successfully performs LBT in the second cell, time period information from when the terminal device successfully performs LBT in the second cell to when it successfully performs random access in the second cell, and time period information from when the terminal device successfully performs random access in the second cell to when the terminal device sends the first information. The network device determines the reason for the successful CHO in the candidate cell through the fifth parameter, so as to adjust network parameters and thereby improve system performance.

[0012] In another possible design, after a CHO failure in a target cell occurs, the terminal device performs cell selection. If the cell selected by the terminal device is a third cell, and the third cell is not a candidate cell, the terminal device initiates an RRC re-establishment process in the third cell. In this design, the first information also includes a sixth parameter, and the sixth parameter is related to the terminal device failing CHO in the target cell and performing RRC re-establishment in the third cell.

[0013] In another possible design, the sixth parameter includes at least one of the following: indication information that the terminal device successfully initiates the RRC re-establishment process in the third cell, time period information from the time the terminal device starts to initiate the RRC re-establishment process in the third cell to the time the terminal device successfully initiates the RRC re-establishment process in the third cell, and time period information from the time the terminal successfully initiates the RRC re-establishment process in the third cell to the time the terminal device sends the first information.

[0014] In another possible design, if the source base station fails to perform LBT in the source cell multiple times until LBT finally succeeds, the source base station can adjust the LBT parameters after receiving the first information based on its own recorded relevant circumstances of LBT in the source cell and the first information.

[0015] In another possible design, the network device is a source base station, a base station to which a target cell belongs, or a base station to which a candidate cell belongs.

[0016] In a second aspect, embodiments of the present application provide a communication method, including: a first network device receiving first information, the first information including a first parameter, the first parameter being related to a CHO failure caused by a failure of LBT in a target cell, or the first information including a second parameter, the second parameter being related to a CHO failure caused by a successful LBT in the target cell and a failure of random access; the first network device adjusting network parameters based on the first information, the network parameters including at least one of a parameter for conditional handover between cells by a terminal device and a parameter for channel access LBT. By receiving the first information, the network device determines the cause of the CHO failure in the target cell and adjusts the corresponding network parameters, thereby improving system performance.

[0017] In one possible design, the first network device receives first information from the second network device, where the first information is received by the second network device from the terminal device.

[0018] In another possible design, the first network device generates second information based on the first information; the first network device sends the second information to the third network device, where the second information is used to instruct the third network device to adjust network parameters.

[0019] In another possible design, the first network device is a source base station, or the first network device is a base station other than the source base station, or the first network device is a core network device.

[0020] In a third aspect, an embodiment of the present application provides a communication method, including: a terminal device receiving a conditional handover (CHO) command from a source base station, the CHO command including information about multiple candidate cells; before the terminal device determines a target cell according to the CHO command, a radio link failure (RLF) occurs in the source cell, and the terminal device performs cell selection; the terminal device sends first information to a network device, the first information including a first parameter, the first parameter being related to the CHO failure caused by the RLF in the source cell. By reporting the first information to the network device, the network device can determine the cause of the CHO failure based on the first information and adjust corresponding network parameters, thereby improving system performance.

[0021] In another possible design, the first parameter includes at least one of the following: an indication of RLF occurrence in the source cell, and a time period from when the terminal device receives the CHO command to when the RLF occurs in the source cell. The network device determines the cause of the RLF occurrence in the source cell based on the first parameter to adjust network parameters to improve system performance.

[0022] In another possible design, when the terminal device performs cell selection, the selected cell is the first cell, which is one of the candidate cells. When the terminal device fails to perform LBT in the first cell, or succeeds in performing LBT in the first cell and fails in random access, the terminal device initiates an RRC re-establishment process; wherein, when the terminal device fails to perform LBT in the first cell, the first information also includes a second parameter, and the second parameter is related to the CHO failure caused by the terminal device's failure to perform LBT in the first cell, or when the terminal device succeeds in performing LBT in the first cell and fails in random access, the first information also includes a third parameter, and the third parameter is related to the CHO failure caused by the terminal device's success in performing LBT in the first cell and failure in random access. The terminal device initiates an RRC re-establishment process when CHO fails in the candidate cell, and reports the cause of the CHO failure so that the network device can adjust the network parameters, thereby improving the performance of the system.

[0023] In another possible design, the second parameter includes at least one of the following: indication information of the terminal device failing to perform LBT in the first cell, time period information from the terminal device starting to perform LBT in the first cell to the failure of LBT in the first cell, time period information from the terminal device failing to perform LBT in the first cell to the terminal device initiating an RRC re-establishment process, and time period information from the terminal device failing to perform LBT in the first cell to the terminal device sending the first information. The network device determines the cause of the CHO failure in the candidate cell through the second parameter, so as to adjust the network parameters and thus improve system performance.

[0024] In another possible design, the third parameter includes at least one of the following: indication information about that the terminal device succeeds in LBT in the first cell, indication information about that the terminal device fails in random access in the first cell, time period information from when the terminal device starts LBT in the first cell to when the terminal device succeeds in LBT in the first cell, time period information from when the terminal device succeeds in LBT in the first cell to when the terminal device fails in random access in the first cell, time period information from when the terminal device fails in random access in the first cell to when the terminal device initiates an RRC reestablishment procedure, and time period information from when the terminal device fails in random access in the first cell to when the terminal device sends the first information. The network device determines a reason for CHO failure in the candidate cell based on the third parameter, so as to adjust network parameters and improve system performance.

[0025] In another possible design, when performing cell selection, the terminal device selects a second cell as a cell, and the second cell is one of the candidate cells. When succeeding in LBT and succeeding in random access in the second cell, the terminal device switches to the second cell. The first information further includes a fourth parameter, and the fourth parameter is related to that the terminal device succeeds in LBT and succeeds in random access in the second cell, which leads to CHO success. The terminal device reports a reason for CHO success when successfully connecting in the candidate cell, so as to enable the network device to adjust network parameters and improve system performance.

[0026] In another possible design, the fourth parameter includes at least one of the following: indication information about that the terminal device succeeds in LBT in the second cell, indication information about that the terminal device succeeds in random access in the second cell, time period information from when the terminal device starts LBT in the second cell to when the terminal device succeeds in LBT in the second cell, time period information from when the terminal device succeeds in LBT in the second cell to when the terminal device succeeds in random access in the second cell, and time period information from when the terminal device succeeds in random access in the second cell to when the terminal device sends the first information. The network device determines a reason for CHO success in the candidate cell based on the fourth parameter, so as to adjust network parameters and improve system performance.

[0027] In another possible design, when performing cell selection, when the terminal device selects a third cell as a cell, the terminal device initiates an RRC reestablishment procedure in the third cell, and the third cell is a cell other than the candidate cells. The RRC reestablishment procedure in the cell other than the candidate cells guarantees network connection. In this design, the first information further includes a fifth parameter, and the fifth parameter is related to that the terminal device has RLF in a source cell and performs RRC reestablishment in the third cell.

[0028] In another possible design, the fifth parameter includes at least one of the following: indication information that the terminal device successfully initiates the RRC re-establishment process in the third cell, time period information from the time the terminal device starts to initiate the RRC re-establishment process in the third cell to the time the terminal device successfully initiates the RRC re-establishment process in the third cell, and time period information from the time the terminal successfully initiates the RRC re-establishment process in the third cell to the time the terminal device sends the first information.

[0029] In another possible design, the network device is a source base station, a base station to which a target cell belongs, or a base station to which a candidate cell belongs.

[0030] In a fourth aspect, embodiments of the present application provide a communication method, comprising: a first network device receiving first information, the first information including a first parameter, the first parameter being related to a CHO failure caused by RLF in a source cell; and the first network device adjusting a network parameter based on the first information, the network parameter including at least one of a parameter for conditional handover of a terminal device between cells and a parameter for LBT (Low-band Wi-Fi) channel access. By receiving the first information, the network device determines the cause of the CHO failure and adjusts the corresponding network parameter, thereby improving system performance.

[0031] In one possible design, the first network device receives first information from the second network device, where the first information is received by the second network device from the terminal device.

[0032] In another possible design, the first network device generates second information based on the first information; the first network device sends the second information to the third network device, where the second information is used to instruct the third network device to adjust network parameters.

[0033] In another possible design, the first network device is a source base station, or the first network device is a base station other than the source base station, or the first network device is a core network device.

[0034] In a fifth aspect, an embodiment of the present application provides a communication method, comprising: when a source base station fails to perform channel access LBT in a source cell, resulting in a failure to send a CHO command, a terminal device initiates a radio resource control RRC re-establishment process after a radio link failure RLF occurs in the source cell, and sends a first message to the base station where the RRC re-establishment cell is located. The first information is related to the CHO failure caused by the source base station's failure to perform LBT in the source cell. The terminal device determines the reason why the source base station failed to send the CHO command by sending the first information to the network device, and adjusts the corresponding network parameters, thereby improving the performance of the system.

[0035] In a sixth aspect, embodiments of the present application provide a communication method, comprising: a network device receiving first information related to a CHO failure caused by a source base station failing to perform LBT in a source cell; and adjusting network parameters based on the first information, the network parameters including parameters for channel access LBT. By receiving the first information, the network device determines a reason why the source base station failed to send a CHO command and adjusts the corresponding network parameters, thereby improving system performance.

[0036] In the seventh aspect, an embodiment of the present application provides a communication device, which is configured to implement the methods and functions performed by the terminal device in the above-mentioned first aspect, third aspect and fifth aspect, and is implemented by hardware / software, and its hardware / software includes modules corresponding to the above-mentioned functions.

[0037] In the eighth aspect, an embodiment of the present application provides a communication device, which is configured to implement the methods and functions performed by the network equipment in the second, fourth and sixth aspects above, and is implemented by hardware / software, and its hardware / software includes modules corresponding to the above functions.

[0038] In the ninth aspect, an embodiment of the present application provides a communication device, which is applied to a terminal device. The communication device can be a terminal device or a chip in the terminal device. The communication device includes: a processor, a memory and a communication bus, wherein the communication bus is used to realize the connection and communication between the processor and the memory, and the processor executes the program stored in the memory to implement the steps of the above-mentioned first aspect, third aspect and fifth aspect.

[0039] In the tenth aspect, an embodiment of the present application provides a communication device, which is applied to a network device. The communication device can be a network device or a chip in the network device. The communication device includes: a processor, a memory and a communication bus, wherein the communication bus is used to realize the connection and communication between the processor and the memory, and the processor executes the program stored in the memory to implement the steps of the second, fourth and sixth aspects above.

[0040] In an eleventh aspect, the present application provides a computer-readable storage medium, in which instructions are stored. When the computer-readable storage medium is run on a computer, the computer executes the methods in the above aspects.

[0041] In a twelfth aspect, the present application provides a computer program product comprising instructions, which, when executed on a computer, enables the computer to execute the methods in the above aspects.

[0042] In the thirteenth aspect, an embodiment of the present application provides a chip, including a processor, for calling and executing instructions stored in the memory from the memory, so that a communication device equipped with the chip executes any of the methods in the above aspects.

[0043] In the fourteenth aspect, an embodiment of the present application provides another chip, including: an input interface, an output interface, a processor, and optionally, a memory. The input interface, the output interface, the processor and the memory are connected through an internal connection path. The processor is used to execute the code in the memory. When the code is executed, the processor is used to execute the method in any of the above aspects.

[0044] In the fifteenth aspect, an embodiment of the present application provides a communication system, which includes at least one terminal device and at least one network device, the terminal device is used to execute the steps in the above-mentioned first aspect, third aspect and fifth aspect, and the network device is used to execute the steps in the above-mentioned second aspect, fourth aspect and sixth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the background technology, the drawings required for use in the embodiments of the present application or the background technology will be described below.

[0046] Figure 1 is a schematic diagram of a communication system provided in an embodiment of the present application;

[0047] Figure 2 It is a structural diagram of a network device;

[0048] Figure 3 It is a structural diagram of another type of network equipment;

[0049] Figure 4 It is a schematic diagram of a CHO process;

[0050] Figure 5 This is a flow chart of a communication method provided in an embodiment of the present application;

[0051] Figure 6 This is a flow chart of another communication method provided in an embodiment of the present application;

[0052] Figure 7 This is a flow chart of another communication method provided in an embodiment of the present application;

[0053] Figure 8 This is a flow chart of another communication method provided in an embodiment of the present application;

[0054] Figure 9 This is a flow chart of another communication method provided in an embodiment of the present application;

[0055] Figure 10 This is a schematic diagram of the structure of a communication device provided in an embodiment of the present application;

[0056] Figure 11is a structural diagram of another communication device provided in an embodiment of the present application;

[0057] Figure 12 This is a schematic diagram of the structure of a terminal device provided in an embodiment of the present application;

[0058] Figure 13 This is a structural diagram of a network device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0059] The embodiments of the present application are described below in conjunction with the drawings in the embodiments of the present application.

[0060] like Figure 1 As shown, Figure 1 1 is a schematic diagram of a communication system provided in an embodiment of the present application. The communication system may include multiple network devices (eg, network device 102, network device 104, and network device 106, etc.), and terminal device 101.

[0061] The terminal devices involved in this application may include devices that provide voice and / or data connectivity to users. Specifically, it includes devices that provide voice to users, or includes devices that provide data connectivity to users, or includes devices that provide voice and data connectivity to users. For example, it may include a handheld device with wireless connection function, or a processing device connected to a wireless modem. The terminal device can communicate with the core network via the radio access network (RAN), exchange voice or data with the RAN, or interact voice and data with the RAN. The terminal device may include user equipment (UE), mobile station (MS), mobile terminal (MT), etc., which refers to a device that provides voice and / or data connectivity to users. For example, a handheld device with wireless connection function, a vehicle-mounted device, etc. For example, mobile phones, tablet computers, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc.

[0062] In the embodiments of the present application, UE is used as the terminal device to illustrate the technical solution of the present application, which will not be repeated in the following text.

[0063] The network equipment involved in this application may include core network equipment and access network equipment.

[0064] Core network equipment refers to equipment in the core network (CN) that provides service support for terminal equipment. Core network equipment may include access and mobility management function (AMF) entity, session management function (SMF) entity, user plane function (UPF) entity, etc. Among them, the AMF entity may be responsible for access management and mobility management of terminal equipment; the SMF entity may be responsible for session management, such as user session establishment, etc.; the UPF entity may be a functional entity of the user plane, mainly responsible for connecting to the external network. It should be noted that in this application, entities may also be referred to as network elements or functional entities. For example, the AMF entity may also be referred to as an AMF network element or an AMF functional entity. For another example, the SMF entity may also be referred to as an SMF network element or an SMF functional entity, etc.

[0065] like Figure 2 As shown, the access network device can be a base station (such as a gNB), which can include a centralized unit (CU) node and a distributed unit (DU) node. The CU implements some of the functions of the gNB, and the DU implements some of the functions of the gNB. For example, the CU can implement the functions of the radio resource control (RRC), service data adaptation protocol (SDAP) layer, and packet data convergence protocol (PDCP) layer. In addition, the DU can implement the functions of the radio link control (RLC), media access control (MAC), and physical (PHY) layers.

[0066] like Figure 3 As shown, Figure 3 This is a schematic diagram of the structure of a network device. A CU node can be divided into a control plane (CU-CP) and a user plane (CU-UP). The CU-CP is responsible for control plane functions, while the CU-UP is responsible for user plane functions. The CU-CP and CU-UP can communicate via the E1 interface, while the CU-CP and DU can communicate via the F1-C interface.

[0067] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: long term evolution (LTE) systems, fifth generation (5G) systems, such as new radio (NR) systems, and other new communication systems, such as 6G systems.

[0068] The following is an introduction to the technologies related to this application.

[0069] LBT:

[0070] Operators with insufficient licensed spectrum can adopt license-assisted access (LAA) to achieve better coverage and capacity. Unlicensed spectrum can be used, and cells in unlicensed frequency bands can be configured as CA secondary carriers to offload traffic from the licensed spectrum. Because wireless resources can be freely used in unlicensed spectrum, preventing interference between adjacent communication devices becomes a key issue. Comprehensive management and control of interference in both the frequency and time domains is required; otherwise, normal communication in unlicensed spectrum cannot be guaranteed.

[0071] In order to solve the above-mentioned interference problem, LBT technology is introduced. LBT refers to the use of LAA cells (i.e. cells using unlicensed spectrum) to perform channel monitoring before sending data to check whether the current channel is idle. If it is idle, data transmission is performed. If the current channel is busy, it must be delayed for a period of time until the channel is idle for data transmission. Each data transmission cannot exceed the preset time. The data transmission must be released after the preset time is reached, and the LBT process must be used to monitor again whether data transmission can be performed. That is, before sending signaling / data, LBT needs to be executed for cells using unlicensed spectrum. LBT will be executed on both the base station side and the UE side. During the LBT execution process, LBT failure may occur, that is, no suitable channel is found for transmission.

[0072] The basic process of CHO using licensed spectrum:

[0073] like Figure 4 As shown, Figure 4 This is a schematic diagram of a CHO process. The network device can configure one or more candidate cells for the UE. Specifically, if the network device configures multiple candidate cells for the UE, the network device can send the CHO configuration information corresponding to the multiple candidate cells to the UE through one RRC message or multiple RRC messages. The above RRC message can be a newly defined message (such as CondRRCReconfiguration) or a reused existing RRC message (such as a reused RRC reconfiguration message). The details are as follows:

[0074] When the signal quality of the source link is good, the source base station sends an RRC message to the UE, which may include CHO configuration information corresponding to at least one candidate cell. The CHO configuration information corresponding to a candidate cell may include CHO execution condition information and related information of the candidate cell.

[0075] The relevant information of the candidate cell may include at least one of the following: a cell radio network temporary identifier (C-RNTI) allocated by the candidate cell to the terminal device, resource information of the random access channel (RACH) required to access the candidate cell, index information corresponding to the candidate cell (for example, the measurement identifier measID corresponding to the cell and / or the CHO-ConfigId corresponding to the cell), the cell global identity (CGI) of the candidate cell, the physical cell identifier (PCI) of the candidate cell, and the frequency information corresponding to the candidate cell, the physical layer configuration parameters corresponding to the candidate cell, the MAC layer configuration parameters, the RLC layer configuration parameters, the PDCP layer configuration parameters, the SDAP layer configuration parameters, the RRC layer configuration parameters, etc. Among them, the frequency information corresponding to the candidate cell includes one or more of the following: the absolute frequency of the synchronization signal block SSB (absolute frequency SSB), the absolute frequency position (absolute frequency point A) of the reference resource module (common RB0), the frequency bandwidth list (frequency band list), and the SCS-specific carrier list (scs-specific carrier list).

[0076] The CHO execution condition information may include a CHO execution event type and a corresponding threshold value. The CHO execution event type may include event A3, event A4, event A5, event B1, event B2 or other execution event types. A candidate cell may be configured with one or more CHO execution conditions. For example, a candidate cell may be configured with one execution event type, but may be configured with at least two different threshold values ​​and / or at most two different trigger qualities (trigger quantity). The trigger quality may include reference signal received power (RSRP), reference signal received quality (RSRQ), and signal to interference plus noise ratio (SINR). Alternatively, a candidate cell may be configured with at least two different execution event types and threshold values ​​corresponding to each execution event type. The CHO execution event types corresponding to different candidate cells may be the same or different. The threshold values ​​corresponding to different candidate cells may be the same or different, without limitation.

[0077] After receiving the above-mentioned RRC message, the UE determines whether the candidate cell meets the CHO execution condition based on the RRC message, and selects a candidate cell that meets the execution condition as the target cell. For example, for candidate cell A, the configured CHO execution event type is an A3 event, and the configured corresponding threshold value is a first threshold value. When the cell signal quality of candidate cell A is higher than the first threshold value of the cell signal quality of the serving cell, it can be considered that candidate cell A meets the CHO execution condition, and candidate cell A can be determined as the target cell. Specifically, for example, for candidate cell A, an A3 event is configured, and two trigger qualities are configured, such as RSRP and RSRQ. The configured first threshold value corresponding to RSRP is E, and the configured first threshold value corresponding to RSRQ is F. Then, when the RSRP of candidate cell A is higher than the RSRP of the serving cell by E, and the RSRQ of candidate cell A is higher than the RSRQ of the serving cell by F, it can be considered that candidate cell A meets the CHO execution condition, and candidate cell A can be determined as the target cell. For another example, corresponding to candidate cell B, if the configured CHO execution event type is an A5 event, a trigger quality is configured, such as RSRP, and the corresponding threshold values ​​are configured as the second threshold and the third threshold, then when the RSRP of candidate cell B is higher than the second threshold and the RSRP of the serving cell is lower than the third threshold, it can be considered that candidate cell B meets the CHO execution conditions, and the candidate cell B can be determined as the target cell.

[0078] The basic process of CHO using unlicensed spectrum is as follows:

[0079] The basic CHO process for using unlicensed spectrum can be found in Figure 4 The difference is that since the source cell / candidate cell uses unlicensed spectrum, the UE or network device needs to perform LBT before sending messages or data. Only when LBT succeeds can messages or data be sent.

[0080] CHO failure handling mechanism:

[0081] (1) After the UE determines the target cell, it performs a random access procedure with the target cell. Optionally, the random access procedure can be skipped. That is, after the UE determines the target cell, it can directly send an RRC reconfiguration complete message to the target base station. If the UE fails to successfully access / handover to the target cell, action A is performed.

[0082] (2) Before the UE determines the target cell based on the CHO configuration information, or after the UE determines the target cell but before successfully switching to the target cell, if RLF occurs in the source cell, perform action A.

[0083] (3) In the CHO mechanism, the source base station can maintain the RRC connection / data transmission with the UE until the UE determines the target cell or until the UE successfully switches to the target cell that meets the CHO execution conditions. For example, the UE sends an RRC reconfiguration completion message to the target cell that has been successfully accessed. That is, after the network device sends an RRC message containing CHO configuration information to the UE for the first time, it can subsequently send another RRC message to the UE. For example, a traditional handover message can be sent to the UE. Accordingly, before the UE determines the target cell based on the CHO configuration information, if the UE receives a traditional handover message, the UE stops the CHO process. For example, the UE stops the process of trying to determine the target cell from the candidate cells. Instead, the traditional handover process is performed according to the traditional handover message. Alternatively, if the UE receives a traditional handover message after the UE determines the target cell but before it has successfully switched to the target cell, the UE stops the CHO process, for example, the UE stops the random access process with the determined target cell, and performs the traditional handover process according to the traditional handover message. If the traditional handover process fails, action A is performed.

[0084] Action A: The UE performs cell selection. (1) If the selected cell is one of the candidate cells, the UE attempts to handover to the cell. Furthermore, if the UE successfully accesses / hands over to the cell, the CHO process is considered successful. If the UE successfully accesses / hands over to the cell, the UE performs an RRC re-establishment process. (2) If the selected cell is not a candidate cell, the UE performs an RRC re-establishment process.

[0085] Mobility robustness optimization (MRO) mechanism:

[0086] Under the existing MRO mechanism, the terminal device sends relevant information about the handover failure process to the network device, which then optimizes the handover parameters based on the information reported by the terminal device. The terminal device reports relevant parameters during the handover failure process in the following two scenarios: First, the terminal device fails to receive the traditional handover message, resulting in an RLF; second, the terminal device successfully receives the traditional handover message, but fails to access the target cell or experiences an RLF soon after accessing the target cell.

[0087] Taking the traditional handover process as an example, scenarios where the terminal device records relevant information during the handover failure process include:

[0088] If the UE fails to connect to the current cell after a period of time, or if the UE fails to receive a traditional handover message, that is, the UE experiences an RLF in the source cell (ie, the connection failure type is RLF), then the UE attempts to reestablish the connection.

[0089] After the UE successfully switches from the source cell to the target cell, a connection failure occurs (ie, the connection failure type is RLF). The UE attempts to reestablish the connection in the source cell or another cell different from the target cell.

[0090] When the UE switches from a source cell to a target cell, a handover failure occurs (ie, the connection failure type is HOF). The UE attempts to reestablish the connection in the source cell or another cell different from the target cell.

[0091] In the above three scenarios, the UE records the relevant information during the handover failure process and reports the relevant information during the handover failure process through an RLF report. The relevant information during the handover failure process includes one or more of the following:

[0092] (1) failedPcellID: The cell information where the UE detects RLF, or the cell information of the target cell where the handover fails.

[0093] (2)connectionFailureType: Connection failure type, such as RLF or HOF.

[0094] (3) previousPCellId: the cell information of the source cell when the UE last received a handover command.

[0095] (4) reestablishmentCellId: information about the cell that initiates reestablishment after a connection failure.

[0096] (5) C-RNTI: UE's identification information of the cell where the failure occurs. Specifically, the C-RNTI assigned to the UE by the serving cell at the time of RLF, the C-RNTI assigned to the UE by the source cell at the time of HOF, and / or the C-RNTI assigned to the UE by the target cell at the time of HOF.

[0097] (6) timeConnFailure: Time period from the last time of receiving the HO command to the connection failure.

[0098] (7) timeFromConnFailureToReconnection: Time period from the time of handover failure or RLF to the time of UE's reconnection (or reconnection).

[0099] (8) timeSinceFailure: Time length since the connection failure is recorded. Generally, it refers to the time period from the connection failure to the time of reporting the failure report.

[0100] (9) Signal quality of each cell. The signal quality can include the signal quality of the cell and / or the signal quality of at least one beam belonging to the cell. The signal quality includes RSRP and / or RSRQ and / or SINR. The signal quality can be a measurement result obtained based on the radio resource management (RRM) measurement of the synchronization signal block (SSB) and / or the channel state information-reference signals (CSI-RS).

[0101] The above cell information can include cell global Identifier (CGI), physical cell identifier (PCI), and frequency point information. Optionally, at least one of tracking area code (TAC) and RAN area code (RANAC) can also be included. The CGI includes PLMN ID and cell ID.

[0102] UE reporting mechanism: The UE can send an indication message to the first network device, which is used to instruct the UE to record and save relevant information about the connection failure; then the first network device sends a request message (such as a user information request message) to the UE, and after receiving the request message sent by the first network device, the UE sends the corresponding information recorded by the UE to the first network device. For example, the UE sends a user information response (UEInformationResponse) message to the first network device, and the UEInformationResponse message can include the corresponding information recorded by the UE. Among them, the first network device can be a network device to which the source cell belongs, a network device to which the target cell belongs, a network device to which the RRC re-established cell belongs, or other network device, and this is not limited. After the first network device receives the corresponding information reported by the UE, it can send part or all of the information reported by the UE to the source network device. Optionally, the source network device adjusts the corresponding parameters based on the received part or all of the information. Optionally, the source network device can also send part or all of the received part or all of the information to the target network device or the re-established network device, and accordingly, the target network device or the re-established network device adjusts the corresponding parameters. Alternatively, after receiving the corresponding information reported by the UE, the first network device may also send part or all of the information reported by the UE to the target network device. Optionally, the target network device may also send part or all of the received partial or full information to the source network device, and the source network device may adjust the corresponding parameters.

[0103] However, LBT failure may also cause CHO process failure, but the UE may not record the parameters related to the CHO failure caused by LBT failure, and the network equipment cannot identify whether the failure is caused by a mobility parameter configuration problem or an LBT problem, affecting system performance. To solve the above technical problems, the embodiments of the present application provide the following solutions.

[0104] like Figure 5 The embodiment of the present application provides a communication method. The steps in the embodiment of the present application at least include:

[0105] S501: A UE receives a CHO command from a source base station, and the UE determines to switch from a source cell to a target cell according to the CHO command.

[0106] Optionally, before sending a CHO command to the UE, the source base station may first perform LBT on the source cell. If LBT succeeds, the source base station sends a CHO command to the UE. If LBT fails, the source base station may re-perform LBT on the source cell until LBT succeeds. In this case, the source base station may record the relevant information about its LBT on the source cell before sending the CHO command.

[0107] S502: When the UE fails to perform channel access LBT in the target cell, or succeeds in LBT in the target cell but fails in random access (for example, fails to establish RACH), the UE performs cell selection.

[0108] S503, the UE sends first information to the network device, where the first information includes a first parameter, and the first parameter is related to the CHO failure caused by the failure of LBT in the target cell, or the first information includes a second parameter, and the second parameter is related to the CHO failure caused by the success of LBT in the target cell and the failure of random access.

[0109] Optionally, the network device is the source base station, the base station to which the target cell belongs, or the base station to which the candidate cell belongs, or may be other base stations.

[0110] Optionally, the network device may include a first network device and a second network device. For example, the first network device may be a source base station, and the second network device may be a base station other than the source base station, or the first network device may be a target base station, and the second network device may be a core network device, etc.

[0111] Optionally, the first network device may receive the first information from the second network device, where the first information is received by the second network device from the UE.

[0112] Optionally, the first network device may generate second information based on the first information and send the second information to a third network device, where the second information is used to instruct the third network device to adjust the network parameters.

[0113] The candidate cell can be used as an alternative cell for the UE to access when the UE cannot access the target cell. The UE fails to switch from the source cell to the target cell in the following two situations:

[0114] In the first case, that is, the UE fails to perform LBT on the target cell, the first information includes a first parameter, which may include at least one of the following: an indication that the target cell meets the execution conditions of the CHO command but fails to perform LBT on the target cell, a time period from when the UE receives the CHO command to when the target cell is determined, and a time period from when the target cell is determined to when the UE fails to perform LBT on the target cell.

[0115] Optionally, the first parameter may also include cell information of the source cell, cell information of the target cell, the cell radio network temporary identifier C-RNTI allocated by the target cell to the UE, the failure type value of the UE in the target cell (for example, HOF), the signal quality of the source cell and the signal quality of the target cell when the UE fails to perform LBT in the target cell, etc.

[0116] The second case is that the UE successfully performs LBT on the target cell but fails random access. The first information includes a second parameter, which may include at least one of the following: indication information that the target cell meets the execution conditions of the CHO command and successfully performs LBT on the target cell, indication information that the UE fails random access on the target cell, time period information from the UE receiving the CHO command to determining the target cell, time period information from determining the target cell to the UE successfully performing LBT on the target cell, and time period information from the UE successfully performing LBT on the target cell to the UE failing random access on the target cell.

[0117] Optionally, the second parameter may also include cell information of the source cell, cell information of the target cell, C-RNTI allocated by the target cell to the UE, failure type value of the UE in the target cell (e.g., HOF), signal quality of the source cell and signal quality of the target cell when the UE successfully performs LBT in the target cell, and signal quality of the source cell and signal quality of the target cell when the UE fails randomly in the target cell.

[0118] Optionally, after the UE fails to switch from the source cell to the target cell, the UE may select a cell in the following scenarios:

[0119] The first optional scenario:

[0120] The CHO command includes information about candidate cells. The cell selected by the UE is the first cell, which is one of the candidate cells. When the UE fails to perform LBT in the first cell, or succeeds in performing LBT in the first cell but fails random access, the UE initiates a radio resource control (RRC) re-establishment procedure. The first information may be a radio link failure report (RLFreport).

[0121] When the UE fails to perform channel access LBT in the first cell, the first information further includes a third parameter, and the third parameter is related to the CHO failure caused by the UE's failure to perform LBT in the first cell.

[0122] Among them, the third parameter may include at least one of the following: indication information of the UE's failure to perform LBT in the first cell, time period information from the UE starting to perform LBT in the first cell to the UE failing to perform LBT in the first cell, time period information from the UE failing to perform LBT in the first cell to the UE initiating the RRC re-establishment process, and time period information from the UE failing to perform LBT in the first cell to the UE sending the first information.

[0123] Optionally, the third parameter also includes cell information of the first cell, cell information of the RRC re-established cell, the C-RNTI allocated to the UE by the first cell, the failure type value of the UE in the first cell (for example, HOF), the signal quality of the source cell when the UE fails to perform LBT in the first cell, the signal quality of the target cell, and the signal quality of other candidate cells.

[0124] Alternatively, when the UE successfully performs LBT in the first cell but fails random access, the first information further includes a fourth parameter, and the fourth parameter is related to the CHO failure caused by the UE successfully performing LBT in the first cell but failing random access.

[0125] Among them, the fourth parameter includes at least one of the following: indication information of the UE's successful LBT in the first cell, indication information of the UE's failure in random access in the first cell, time period information from the UE starting LBT in the first cell to the UE's successful LBT in the first cell, time period information from the UE's successful LBT in the first cell to the UE's failure in random access in the first cell, time period information from the UE's failure in random access in the first cell to the terminal initiating the RRC re-establishment process, and time period information from the UE's failure in random access in the first cell to the UE sending the first information.

[0126] Optionally, the fourth parameter also includes cell information of the first cell, cell information of the RRC re-established cell, C-RNTI allocated to the UE by the first cell, failure type value of the UE in the first cell, signal quality of the source cell when the UE successfully performs LBT in the first cell, signal quality of the target cell and signal quality of the first cell, signal quality of the source cell when the UE fails to perform random access in the first cell, signal quality of the target cell, signal quality of the first cell and signal quality of other candidate cells.

[0127] The RRC re-establishment cell may be a source cell, a target cell, a candidate cell or other cells, which is not limited here.

[0128] The second optional scenario:

[0129] The CHO command includes information about the candidate cell. The cell selected by the UE is the second cell, which is one of the candidate cells. When the UE successfully performs LBT and random access in the second cell, the UE switches to the second cell. The first information may be a success report.

[0130] The first information also includes a fifth parameter, and the fifth parameter is related to the success of CHO caused by the UE successfully performing LBT and random access in the second cell.

[0131] The fifth parameter includes at least one of the following: indication information that the UE successfully performs LBT in the second cell, indication information that the UE successfully performs random access in the second cell, time period information from when the UE starts performing LBT in the second cell to when the UE successfully performs LBT in the second cell, time period information from when the UE successfully performs LBT in the second cell to when random access in the second cell is successful, and time period information from when the terminal successfully performs random access in the second cell to when the UE sends the first information.

[0132] Optionally, the fifth parameter also includes cell information of the second cell, the C-RNTI allocated by the second cell to the UE, the signal quality of the source cell when the UE successfully performs LBT in the second cell, the signal quality of the target cell, the signal quality of the second cell, and the signal quality of other candidate cells.

[0133] The third optional scenario;

[0134] The CHO command may include information indicating the candidate cell. When the cell selected by the UE is the third cell, the UE initiates an RRC re-establishment procedure in the third cell, which is not a candidate cell. The first information also includes a sixth parameter, which is related to the UE performing RRC re-establishment in the third cell after a CHO failure in the target cell.

[0135] Optionally, the sixth parameter includes at least one of the following: indication information that the UE successfully initiates the RRC re-establishment process in the third cell, time period information from the time the UE starts to initiate the RRC re-establishment process in the third cell to the time the UE successfully initiates the RRC re-establishment process in the third cell, and time period information from the time the terminal successfully initiates the RRC re-establishment process in the third cell to the time the UE sends the first information.

[0136] S504: The network device adjusts network parameters based on the first information. The network parameters include at least one of parameters for conditional handover of the UE between cells (also referred to as handover parameters) and parameters for channel access LBT (also referred to as LBT parameters). The following describes how the network device adjusts network parameters based on the first information in conjunction with the above scenarios:

[0137] In the first optional scenario mentioned above, the UE fails to perform LBT in the first cell.

[0138] The UE may report the first information to the base station where the RRC re-establishment cell is located. The RRC re-establishment cell may be a source cell, a target cell, a candidate cell, or another cell. The UE may also report the first information to the base station where the source cell, the target cell, the candidate cell, or another cell is located. The base station that receives the first information may send part or all of the first information to the source base station. Optionally, the source base station may determine, based on the first information, whether the cause of the UE's failure in the target cell and the first cell is a cell signal problem or an LBT problem, and then adjust the handover parameters and LBT parameters.

[0139] For example, because the UE fails to perform LBT in the candidate cell, the source base station believes that the failure in the candidate cell is not caused by unreasonable CHO parameter configuration, but due to unreasonable LBT parameters. Therefore, the source base station can adjust the LBT parameters, such as adjusting the maximum number of consecutive LBT failures configured for the candidate cell, controlling the LBT duration, etc.

[0140] For another example, if the UE fails to perform LBT in the target cell, the source base station believes that the failure to perform LBT in the target cell is not caused by unreasonable CHO parameter configuration, but by unreasonable LBT parameters, so the source base station can adjust the LBT parameters. For example, adjust the maximum number of consecutive LBT failures configured for the target cell, control the duration of LBT, etc. If the UE succeeds in LBT in the target cell but fails in CHO, the source base station can determine whether the UE's handover failure in the target cell is caused by a cell signal problem or LBT based on the parameters in the first information. For example, based on the signal quality of the source cell and the candidate cell when the UE succeeds in LBT in the target cell, the signal quality of the source cell and the candidate cell when the UE fails to switch to the target cell, the time period from the start of LBT in the target cell to the UE's successful LBT in the target cell, the time period from the UE's successful LBT in the target cell to the UE's failure to randomly access the target cell, and other parameters, determine whether the UE's handover failure in the target cell is caused by a cell signal problem or LBT, and make adjustments. If the UE's handover failure in the target cell is due to a cell signal problem, the source base station adjusts the handover parameters, such as adjusting the trigger value of the measurement report, CHO execution condition information, etc. If the UE's handover failure in the target cell is due to an LBT problem, the source base station adjusts the LBT parameters, such as adjusting the maximum number of consecutive LBT failures configured for the target base station and the duration of LBT control.

[0141] Alternatively, in the first optional scenario above, the UE successfully performs LBT in the first cell but fails in random access.

[0142] The UE can send the first information to the base station where the RRC re-establishment cell is located. The RRC re-establishment cell can be a source cell, a target cell, a candidate cell or other cells, which is not limited here. Alternatively, the UE can also send the first information to the source cell, the target cell, the candidate cell or other cells. The base station that receives the first information can forward part or all of the received first information to the source base station. Optionally, the source base station determines whether the reason for the UE's failure in the target cell or the candidate cell is a cell signal problem or an LBT problem based on the parameters in the first information, and then adjusts the switching parameters or LBT parameters. For the analysis method of the UE's handover failure in the target cell, please refer to the above description, which will not be repeated here.

[0143] For the candidate cell, since the UE successfully performs LBT in the candidate cell but fails random access, the source base station can determine whether the UE's handover failure in the candidate cell is caused by a cell signal problem or LBT based on the parameters in the first information. For example, based on the signal quality of the source cell and the candidate cell when the UE successfully performs LBT in the candidate cell, the signal quality of the source cell and the candidate cell when the UE fails to switch to the candidate cell, the time period from the UE starting to perform LBT in the candidate cell to the UE's successful LBT in the candidate cell, and the time period from the UE successfully performing LBT in the candidate cell to the UE's failure to randomly access the candidate cell, etc., analyze whether the reason for the UE's handover failure in the candidate cell is a cell signal problem or LBT, and then adjust the network parameters. For example, if the reason for the UE's handover failure in the candidate cell is a cell signal problem, the source base station adjusts the handover parameters, such as adjusting the trigger value of the measurement report, CHO execution condition information, etc. If the reason for the UE's handover failure in the candidate cell is an LBT problem, the source base station adjusts the LBT parameters. For example, adjust the maximum number of consecutive LBT failures configured for the candidate cell, control the duration of LBT, etc.

[0144] Alternatively, in the second optional scenario described above, the UE successfully performs LBT and random access in the second cell.

[0145] The UE can send the first information to the base station where the cell where the CHO is successful is located, and the UE can also send the first information to other cells other than the candidate cell. The base station that receives the first information can forward part or all of the received first information to the source base station. Optionally, the source base station determines whether the reason for the UE's failure in the target cell is a cell signal problem or an LBT problem based on the parameters in the first information, and then adjusts the switching parameters or LBT parameters. For details, please refer to the above-mentioned analysis method for handover failure in the target cell, which will not be repeated here. Optionally, for the candidate cell, since the UE successfully switches to the candidate cell, the source base station can determine whether the candidate cell is a good cell based on the reported first information. For example, analysis is performed based on the signal quality of the source cell, target cell or other candidate cells when the UE fails to randomly access the target cell, and the signal quality of the source cell, target cell and other candidate cells when the UE successfully performs LBT in the candidate cell.

[0146] Alternatively, in combination with the first and second optional scenarios, if the source base station fails to perform LBT on the source cell multiple times until LBT is finally successful, the source base station may, after receiving the first information, adjust LBT parameters based on its own recorded LBT conditions on the source cell and the first information. For example, the maximum number of consecutive LBT failures corresponding to the serving cell may be adjusted, the LBT duration may be controlled, and the like.

[0147] Alternatively, combine the above-mentioned first optional scenario and the second optional scenario. If the UE random access failure is caused by the LBT failure on the base station side, for example, the base station LBT failure makes it impossible to send a random access response (RAR) to the UE, then the base station sends the relevant information of the LBT failure (such as the UE identifier, the cell information of the LBT failure cell, and the LBT failure probability) to the source base station, and after the source base station receives the above-mentioned first information, it determines whether the UE random access failure is caused by the CHO parameter or the LBT parameter based on the first information and the relevant information of the LBT failure, and adjusts the network parameters. For example, if the source base station receives the relevant information of the LBT failure sent by the base station to which the target cell belongs, after receiving the first information sent by other base stations, the source base station may consider that the UE's handover failure in the target cell is caused by its own LBT failure, and then adjust the LBT parameters used by itself. For example, adjust the maximum number of consecutive LBT failures corresponding to the serving cell, control the duration of LBT, etc. It should be noted that the time when the source base station receives the relevant information of the LBT failure is not limited to the order of the time when the source base station receives the first information.

[0148] In an embodiment of the present application, after the UE determines to switch from the source cell to the target cell according to the CHO command, LBT is performed. Since the UE fails to perform LBT in the target cell, or the UE succeeds in performing LBT in the target cell but fails in random access, resulting in the UE failing to switch to the target cell, the UE performs cell selection, and the selected cell belongs to the candidate cell. If the UE fails to perform LBT in the candidate cell; or the UE succeeds in performing LBT and random access in the candidate cell; or the UE succeeds in performing LBT in the candidate cell but fails in random access, the UE records the first information related to the CHO failure in these scenarios and reports the first information to the network device. The network device can determine the reason for the handover failure in the target cell or candidate cell based on the first information, and adjust the corresponding network parameters, thereby improving the performance of the system.

[0149] like Figure 6 As shown, Figure 6 This is a flow chart of a communication method provided by an embodiment of the present application. Figure 5 Further description of the embodiment shown. The steps in the embodiment of the present application at least include:

[0150] S601: The source base station performs LBT in the source cell.

[0151] If the source base station successfully performs LBT in the source cell, S602 is executed. If the source base station fails to perform LBT in the source cell, LBT is performed again in the source cell until LBT succeeds.

[0152] S602: The source base station sends a CHO command to the UE, wherein the CHO command may include information of multiple candidate cells.

[0153] S603: The UE determines to switch from the source cell to the target cell according to the CHO command.

[0154] S604: The UE performs LBT in the target cell.

[0155] If the UE successfully performs LBT in the target cell, S605 is executed. If the UE fails to perform LBT in the target cell, the UE performs cell selection and executes S606-S608, or S609-S612, or S613-S615.

[0156] S605: The UE performs random access (eg, RACH) in the target cell.

[0157] If the UE successfully performs random access in the target cell, the UE is handed over from the source cell to the target cell. If the UE fails to perform random access in the target cell, the UE performs cell selection and executes S606-S608, or S609-S612, or S613-S615.

[0158] The UE performs cell selection in the following three scenarios:

[0159] The first scenario:

[0160] S606: The UE performs LBT in the candidate cell. If the LBT in the candidate cell fails, S607 is executed.

[0161] S607: The UE initiates an RRC re-establishment procedure to the base station where the RRC re-establishment cell is located.

[0162] S608: The UE sends first information to the base station where the RRC re-established cell is located. The content of the first information can refer to the first information recorded by the UE in the scenario where LBT fails in the candidate cell in the above embodiment. No further details will be given here.

[0163] Second scenario:

[0164] S609: The UE performs LBT in the candidate cell. If the LBT in the candidate cell is successful, S610 is executed.

[0165] S610: The UE randomly accesses the candidate cell. If the UE fails to randomly access the candidate cell, S611 is executed.

[0166] S611, the UE initiates an RRC re-establishment procedure to the base station where the RRC re-establishment cell is located.

[0167] S612: The UE sends first information to the base station where the RRC re-established cell is located. The content of the first information may refer to the first information recorded by the UE in the scenario where LBT is successful in the candidate cell but random access fails in the above embodiment. Detailed description is omitted here.

[0168] The third scenario:

[0169] S613: The UE performs LBT in the candidate cell. If the LBT in the candidate cell is successful, S614 is executed.

[0170] S614: The UE randomly accesses the candidate cell. If the UE successfully accesses the candidate cell, the UE is handed over from the source cell to the candidate cell.

[0171] S615, the UE sends the first information to the base station where the candidate cell is located. The content of the first information can refer to the above Figure 5 In the illustrated embodiment, the first information recorded by the UE in the scenario where LBT and random access are successful in the candidate cell is successful is not described in detail here.

[0172] By adopting the technical solution provided in the above embodiments, for the scenario where the UE fails to perform LBT in the target cell, or the UE succeeds in LBT in the target cell but fails in random access, resulting in the UE failing to switch to the target cell, the network device can determine the cause of the switching failure in the target cell or candidate cell based on the first information reported by the UE, and adjust the corresponding network parameters, thereby improving the performance of the system.

[0173] like Figure 7 As shown, for the scenario where RLF occurs in the source cell after the UE receives the CHO command but before the target cell is determined, an embodiment of the present application provides a communication method. The steps in the embodiment of the present application include at least:

[0174] S701: UE receives a conditional handover (CHO) command from a source base station.

[0175] Optionally, before sending a CHO command to the UE, the source base station first performs LBT on the source cell. If LBT succeeds, the source base station sends a CHO command to the UE. If LBT fails, the source base station may perform LBT again on the source cell until LBT succeeds. In this case, the source base station may record relevant information about its LBT on the source cell before sending the CHO command.

[0176] S702: Before the UE determines the target cell according to the CHO command, a radio link failure (RLF) occurs in the source cell.

[0177] S703: The UE performs cell selection.

[0178] S704: The UE sends first information to a network device, where the first information includes a first parameter, and the first parameter is related to the CHO failure caused by the RLF occurring in the source cell.

[0179] Optionally, the network device may be the source base station, the base station to which the target cell belongs, the base station to which the candidate cell belongs, or other base stations.

[0180] The network device may include a first network device and a second network device. For example, the first network device may be a source base station, and the second network device may be a base station other than the source base station. Alternatively, the first network device may be a target base station, and the second network device may be a core network device, etc.

[0181] Optionally, the first network device may receive the first information from the second network device, where the first information is received by the second network device from the UE.

[0182] Optionally, the first network device may generate second information based on the first information; and send the second information to a third network device, where the second information is used to instruct the third network device to adjust the network parameters.

[0183] In a scenario where the source cell has radio link failure (RLF) before the UE determines the target cell, the first parameter can include at least one of the following: indication information of the RLF of the source cell, and a time period from when the UE receives the CHO command to when the RLF of the source cell occurs.

[0184] Optionally, the first parameter further includes cell information of the source cell, signal quality of the source cell when the RLF of the source cell occurs, and the like.

[0185] Optionally, after the RLF of the source cell, the cell selection by the UE can include the following scenarios.

[0186] The first optional scenario:

[0187] The CHO command includes information of candidate cells, the selected cell by the UE is a first cell, and the first cell is one of the candidate cells. When the UE fails in LBT in the first cell or succeeds in LBT in the first cell and fails in random access, the UE initiates an RRC reestablishment procedure. The first information can be an RLF report.

[0188] When the UE fails in LBT in the first cell, the first information can further include a second parameter related to the failure of the CHO due to the failure of the UE in LBT in the first cell.

[0189] The second parameter can include at least one of the following: indication information of the failure of the UE in LBT in the first cell, time period information from when the UE starts LBT in the first cell to when the UE fails in LBT in the first cell, time period information from when the UE fails in LBT in the first cell to when the UE initiates the RRC reestablishment procedure, and time period information from when the UE fails in LBT in the first cell to when the UE sends the first information.

[0190] Optionally, the second parameter further includes: cell information of the first cell, cell information of an RRC reestablishment cell, a C-RNTI allocated to the UE by the first cell, a failure type value of the UE in the first cell, signal quality of the source cell when the UE fails in LBT in the first cell, signal quality of the target cell, and signal quality of other candidate cells.

[0191] When the UE succeeds in LBT in the first cell and fails in random access, the first information further includes a third parameter related to the failure of the CHO due to the failure of the UE in random access in the first cell.

[0192] The third parameter comprises at least one of the following: indication information of LBT success of the UE in the first cell, indication information of random access failure of the UE in the first cell, time period information from starting LBT of the UE in the first cell to LBT success of the UE in the first cell, time period information from LBT success of the UE in the first cell to random access failure of the UE in the first cell, time period information from random access failure of the UE in the first cell to initiation of the RRC re-establishment procedure of the terminal, and time period information from random access failure of the UE in the first cell to sending of the first information by the UE.

[0193] Optionally, the third parameter further comprises: cell information of the first cell, cell information of the RRC re-establishment cell, C-RNTI allocated by the first cell to the UE, failure type value of the UE in the first cell, signal quality of the source cell when LBT succeeds in the first cell, signal quality of the target cell and signal quality of the first cell, signal quality of the source cell when random access fails in the first cell, signal quality of the target cell, signal quality of the first cell, and signal quality of other candidate cells.

[0194] The second optional scenario is as follows:

[0195] The CHO command comprises information of the candidate cell, and the selected cell of the UE is the second cell, which is one of the candidate cells. When LBT succeeds and random access succeeds in the second cell, the UE switches to the second cell. The first information can be a success report. The first information can further comprise a fourth parameter, which is related to LBT success and random access success of the UE in the second cell.

[0196] The fourth parameter comprises at least one of the following: indication information of LBT success of the UE in the second cell, indication information of random access success of the UE in the second cell, time period information from starting LBT of the UE in the second cell to LBT success of the UE in the second cell, time period information from LBT success of the UE in the second cell to random access success in the second cell, and time period information from random access success of the terminal in the second cell to sending of the first information by the UE.

[0197] Optionally, the fourth parameter further comprises: cell information of the second cell, C-RNTI allocated by the second cell to the UE, signal quality of the source cell when LBT succeeds in the second cell, signal quality of the target cell, signal quality of the second cell, and signal quality of other candidate cells.

[0198] The third optional scenario: the CHO command includes information of the candidate cell. When the cell selected by the UE is the third cell, the UE initiates the RRC reestablishment procedure in the third cell, and the third cell is a cell other than the candidate cell. The first information further includes a fifth parameter, and the fifth parameter is related to the RLF of the UE in the source cell and the RRC reestablishment in the third cell.

[0199] Optionally, the fifth parameter includes at least one of the following: indication information that the UE successfully initiates the RRC reestablishment procedure in the third cell, time period information from when the UE initiates the RRC reestablishment procedure in the third cell to when the UE successfully initiates the RRC reestablishment procedure in the third cell, and time period information from when the UE successfully initiates the RRC reestablishment procedure in the third cell to when the UE sends the first information.

[0200] S705, the network device adjusts network parameters according to the first information, and the network parameters include at least one of parameters for conditional handover between cells and parameters for channel access LBT. How to adjust the network parameters according to the first information is described below in combination with the above several scenarios:

[0201] In the above first optional scenario, that is, the UE fails in LBT in the first cell. The first information can be a radio link failure report (RLF report).

[0202] The UE can send the first information to the base station where the RRC reestablishment cell is located. The RRC reestablishment cell can be the source cell, the target cell, the candidate cell or other cells, which are not limited here. Alternatively, the UE can also send the first information to the base station where the source cell, the source cell, the target cell, the candidate cell or other cells are located. The base station receiving the first information can forward part or all of the received first information to the source base station. Optionally, after the source base station receives the first information, it is considered that the late CHO has occurred. Optionally, the UE fails to switch in the candidate cell due to unreasonable LBT parameters, and the source base station can adjust the LBT parameters. For example, the maximum number of consecutive LBT failures, the duration of controlling LBT, etc.

[0203] In the above first optional scenario, that is, the UE succeeds in LBT in the first cell and fails in random access. The first information can be a radio link failure report (RLF report).

[0204] The UE can send the first information to the base station where the RRC reestablishment cell is located, which can be the source cell, the target cell, the candidate cell or other cells, which is not limited here. Alternatively, the UE can also send the first information to the base station where the source cell, the target cell, the candidate cell or other cells are located. The base station receiving the first information can forward part or all of the received first information to the source base station. Alternatively, the source base station can consider that the late CHO has occurred. Alternatively, the source base station can determine whether the UE random access failure in the candidate cell is caused by cell signal problem or LBT according to the first information, and adjust the network parameters. For example, the network parameters are adjusted according to the signal quality of the source cell and the candidate cell when the UE succeeds in LBT in the candidate cell, the signal quality of the source cell and the candidate cell when the UE fails in random access in the candidate cell, the time period from when the UE starts LBT in the candidate cell to when the UE succeeds in LBT in the candidate cell, the time period from when the UE succeeds in LBT in the candidate cell to when the UE fails in random access in the candidate cell, and other parameters. If the random access failure in the candidate cell is caused by cell signal problem, the source base station can adjust the handover parameters, such as adjusting the trigger value of the measurement report, the CHO execution condition information, etc. If the random access failure in the candidate cell is caused by LBT problem, the source base station can adjust the LBT parameters, such as the maximum number of consecutive LBT failures configured by the network, the duration of LBT control, etc.

[0205] In the above second optional scenario, i.e., the UE succeeds in LBT in the second cell and succeeds in random access. The first information can be a successful report.

[0206] The UE can send the first information to the candidate cell where the handover succeeds. Alternatively, the UE can also send the first information to other cells other than the candidate cell. Alternatively, the base station receiving the first information can forward part or all of the received first information to the source base station. Alternatively, the source base station considers that the late CHO has occurred after receiving the first information.

[0207] Alternatively, in combination with the above first optional scenario and the second optional scenario. If the source base station fails in LBT in the source cell for multiple times until the last LBT succeeds, the source base station can adjust the LBT parameters according to the first information and the relevant conditions of LBT in the source cell recorded by itself after receiving the first information. For example, adjusting the maximum number of consecutive LBT failures corresponding to the serving cell, the duration of LBT control, etc.

[0208] Alternatively, in combination with the first and second optional scenarios described above. If the UE random access failure is caused by LBT failure at the base station side, for example, the base station fails to send RAR to the UE due to LBT failure, the base station sends the UE the related information of LBT failure (such as the identity of the UE, the cell information of the LBT failure cell, the LBT failure probability) to the source base station. After receiving the first information described above, the source base station determines whether the UE random access failure is caused by CHO parameters or LBT parameters according to the first information and the related information of LBT failure, and adjusts the network parameters. For example, if the source base station receives the related information of LBT failure sent by the base station to which the target cell belongs, and receives the first information sent by other base stations, the source base station can consider that the handover failure of the UE in the target cell is caused by its own LBT failure, and thus adjusts the LBT parameters used by itself. For example, adjusting the maximum number of consecutive LBT failures of the serving cell, controlling the duration of LBT, etc. It should be noted that the time when the source base station receives the related information of LBT failure is not limited in the order of time when the source base station receives the first information.

[0209] In the embodiments of the present application, after the UE receives the CHO command, the source cell RLF occurs before the target cell is determined, and the UE performs cell selection. The selected cell belongs to the candidate cell. If the UE performs LBT failure in the candidate cell; or the UE performs LBT success and random access success in the candidate cell; or the UE performs LBT success but random access failure in the candidate cell, the UE records the first information related to CHO failure in these scenarios, and reports the first information to the network device. The network device can determine the cause of the handover failure in the target cell or the candidate cell according to the first information, and adjust the corresponding network parameters, thereby improving the performance of the system.

[0210] As shown in Figure 8 , the Figure 8 is a flowchart of a communication method provided by an embodiment of the present application. The embodiment is a further description of the embodiment shown in Figure 7 . The steps in the embodiment of the present application at least include:

[0211] S801, the source base station performs LBT in the source cell.

[0212] If the source base station performs LBT successfully in the source cell, S802 is performed, and if the source base station performs LBT failure in the source cell, LBT is performed again in the source cell until LBT is successful.

[0213] S802, the source base station sends a CHO command to the UE. The CHO command can include information of multiple candidate cells.

[0214] S803: Before the UE determines the target cell according to the CHO command, a radio link failure (RLF) occurs in the source cell. The UE performs cell selection in the following three scenarios:

[0215] The first scenario:

[0216] S804: The UE performs LBT in the candidate cell. If the LBT in the candidate cell fails, S805 is executed.

[0217] S805: The UE initiates an RRC re-establishment procedure to the base station where the RRC re-establishment cell is located.

[0218] S806: The UE sends first information to the base station where the RRC re-established cell is located. The content of the first information can refer to the first information recorded by the UE in the scenario where LBT fails in the candidate cell in the above embodiment. No further details will be given here.

[0219] Second scenario:

[0220] S807, the UE performs LBT in the candidate cell. If the LBT in the candidate cell is successful, execute S808.

[0221] S808: The UE randomly accesses the candidate cell. If the UE fails to randomly access the candidate cell, S809 is executed.

[0222] S809: The UE initiates an RRC re-establishment procedure to the base station where the RRC re-establishment cell is located.

[0223] S810: The UE sends first information to the base station where the RRC re-established cell is located. The content of the first information may refer to the first information recorded by the UE in the scenario where LBT is successful in the candidate cell but random access fails in the above embodiment. Detailed description is omitted here.

[0224] The third scenario:

[0225] S811, the UE performs LBT in the candidate cell. If the LBT in the candidate cell is successful, execute S812.

[0226] S812: The UE randomly accesses the candidate cell. If the UE successfully accesses the candidate cell, the UE is handed over from the source cell to the candidate cell.

[0227] S813, the UE sends first information to the base station where the candidate cell is located. The content of the first information can be found in Figure 7 In the embodiment shown, the first information recorded by the UE in the scenario where LBT and random access are successful in the candidate cell is successful is not described in detail here.

[0228] like Figure 9As shown, for the scenario where the source base station fails to perform LBT before sending a CHO command to the UE, resulting in the inability to send a CHO command to the UE, an embodiment of the present application provides a communication method. The steps in the embodiment of the present application include at least:

[0229] S901: The source base station performs channel access LBT in the source cell.

[0230] Optionally, before the source base station sends a CHO command to the UE, the source base station preferably performs LBT in the source cell. Due to LBT failure, the source base station cannot send a CHO command to the UE. The source base station can record its own LBT failure.

[0231] S902: When the source base station fails to perform channel access LBT in the source cell, resulting in a failure to send a CHO command, the UE cannot perceive the source base station LBT failure, but can record an RLF report. The UE also initiates a radio resource control (RRC) re-establishment process after a radio link failure (RLF) occurs in the source cell.

[0232] S903: The UE may send first information to the base station where the RRC re-established cell is located. The first information is related to the CHO failure caused by the failure of the source base station to perform LBT on the source cell. The first information may be an RLF report.

[0233] Optionally, the UE may also send the first information to the source cell, the candidate cell or other cells.

[0234] Optionally, the first information includes at least one of the following: cell information of the source cell, indication information of RLF occurring in the source cell, signal quality when RLF occurs in the source cell, cell information of the RRC re-establishment cell, failure type value of the UE in the source cell, time period information from when RLF occurs in the source cell to when the UE initiates the RRC re-establishment process, and time period information from when RLF occurs in the source cell to when the UE sends the first report.

[0235] S904: The base station where the RRC re-established cell is located sends an RLF indication to the source base station. The RLF indication may include part or all of the information in the first information.

[0236] Optionally, after receiving the first information, the source base station may determine that the CHO failure was caused by the source base station's LBT failure based on its own recorded LBT failures and the first information. Therefore, the source base station determines that the connection failure is not due to a late handover and may adjust the LBT parameters instead of the CHO parameters. For example, the maximum number of consecutive LBT failures configured for the candidate cell or the duration of the LBT control may be adjusted.

[0237] In an embodiment of the present application, before the source base station sends a CHO command to the UE, the source base station fails to perform LBT, resulting in an inability to send a CHO command to the UE. The network device improves the reliability of the system by determining the cause of the connection failure and adjusting the network parameters.

[0238] The above describes in detail the method of the embodiment of the present application. The following is a description of the device provided in the embodiment of the present application.

[0239] like Figure 10 As shown, Figure 10 1001 is a schematic diagram of the structure of a communication device provided in an embodiment of the present application. The communication device can be a terminal device, or a chip or processing system in the terminal device. The device can be used to implement any method and function related to the terminal device in any of the aforementioned embodiments. The device may include a receiving module 1001, a processing module 1002, and a transmitting module 1003. Optionally, the receiving module 1001 and the transmitting module 1003 correspond to the radio frequency circuit and baseband circuit included in the terminal device. A detailed description of each module is as follows.

[0240] In one embodiment:

[0241] A receiving module 1001 is configured to receive a conditional handover (CHO) command from a source base station, and determine to switch from a source cell to a target cell according to the CHO command;

[0242] The processing module 1002 is configured to perform cell selection when the terminal device fails to perform channel access LBT in the target cell, or succeeds in LBT in the target cell but fails in random access;

[0243] The sending module 1003 is used to send first information to the network device, where the first information includes a first parameter, and the first parameter is related to the CHO failure caused by the failure of LBT in the target cell, or the first information includes a second parameter, and the second parameter is related to the CHO failure caused by the success of LBT in the target cell and the failure of random access.

[0244] Optionally, the first parameter includes at least one of the following: indication information that the target cell meets the execution conditions of the CHO command but LBT fails in the target cell, time period information from the terminal device receiving the CHO command to determining the target cell, and time period information from determining the target cell to the terminal device failing to perform LBT in the target cell.

[0245] Optionally, the second parameter includes at least one of the following: indication information that the target cell meets the execution conditions of the CHO command and LBT is successfully performed in the target cell, indication information that the terminal device fails to randomly access the target cell, time period information from the terminal device receiving the CHO command to determining the target cell, time period information from determining the target cell to the terminal device successfully performing LBT in the target cell, and time period information from the terminal device successfully performing LBT in the target cell to the terminal device failing to randomly access the target cell.

[0246] Optionally, the CHO command includes information of candidate cells, the cell selected by the terminal device is a first cell, and the first cell is one of the candidate cells;

[0247] The processing module 1002 is further configured to initiate a radio resource control RRC re-establishment process when LBT fails in the first cell, or when LBT succeeds in the first cell and random access fails;

[0248] When the terminal device fails to perform channel access LBT in the first cell, the first information further includes a third parameter, and the third parameter is related to the CHO failure caused by the failure of the terminal device to perform LBT in the first cell; or

[0249] When the terminal device successfully performs LBT in the first cell and fails random access, the first information also includes a fourth parameter, and the fourth parameter is related to the CHO failure caused by the terminal device successfully performing LBT in the first cell and failing random access.

[0250] Optionally, the third parameter includes at least one of the following: indication information of the terminal device's failure to perform LBT in the first cell, time period information from the start of LBT by the terminal device in the first cell to the failure of LBT in the first cell, time period information from the failure of LBT by the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of LBT by the terminal device in the first cell to the sending of the first information by the terminal device.

[0251] Optionally, the fourth parameter includes at least one of the following: indication information of the successful LBT of the terminal device in the first cell, indication information of the failed random access of the terminal device in the first cell, time period information from the start of LBT of the terminal device in the first cell to the successful LBT of the terminal device in the first cell, time period information from the successful LBT of the terminal device in the first cell to the failure of random access of the terminal device in the first cell, time period information from the failure of random access of the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of random access of the terminal device in the first cell to the sending of the first information.

[0252] Optionally, the CHO command includes information of a candidate cell, the cell selected by the terminal device is a second cell, and the second cell is one of the candidate cells;

[0253] The processing module 1002 is further configured to, when the terminal device successfully performs LBT and random access in the second cell, switch to the second cell;

[0254] The first information further includes a fifth parameter, and the fifth parameter is related to the success of the CHO caused by the terminal device successfully performing LBT and random access in the second cell.

[0255] Optionally, the fifth parameter includes at least one of the following:

[0256] The indication information that the terminal device successfully performs LBT in the second cell, the indication information that the terminal device successfully performs random access in the second cell, the time period information from the start of LBT in the second cell to the successful LBT in the second cell, the time period information from the successful LBT in the second cell to the successful random access in the second cell by the terminal device, and the time period information from the successful random access of the terminal in the second cell to the sending of the first information by the terminal device.

[0257] Optionally, the CHO command includes indication information of the candidate cell; the processing module 1002 is also used to initiate an RRC re-establishment process in the third cell when the cell selected by the terminal device is a third cell, and the third cell is a cell other than the candidate cell.

[0258] Optionally, the network device is the source base station, the base station to which the target cell belongs, or the base station to which the candidate cell belongs.

[0259] In another embodiment:

[0260] Receiving module 1001, configured to receive a conditional handover CHO command from a source base station;

[0261] A processing module 1002 is configured to select a cell when a radio link failure (RLF) occurs in a source cell before the terminal device determines a target cell, where the target cell is obtained according to the CHO command;

[0262] The sending module 1003 is configured to send first information to a network device, where the first information includes a first parameter, and the first parameter is related to the CHO failure caused by the RLF occurring in the source cell.

[0263] Optionally, the first parameter includes at least one of the following: indication information of RLF occurring in the source cell, and a time period from when the terminal device receives the CHO command to when RLF occurs in the source cell.

[0264] Optionally, the CHO command includes information of candidate cells, the cell selected by the terminal device is a first cell, and the first cell is one of the candidate cells;

[0265] The processing module 1002 is configured to initiate an RRC re-establishment process when the terminal device fails to perform LBT in the first cell, or succeeds in performing LBT in the first cell but fails in random access;

[0266] Wherein, when the terminal device fails to perform LBT in the first cell, the first information further includes a second parameter, and the second parameter is related to the CHO failure caused by the failure of the terminal device to perform LBT in the first cell, or

[0267] When the terminal device successfully performs LBT in the first cell and fails random access, the first information also includes a third parameter, and the third parameter is related to the CHO failure caused by the terminal device successfully performing LBT in the first cell and failing random access.

[0268] Optionally, the second parameter includes at least one of the following: indication information of the terminal device's failure to perform LBT in the first cell, time period information from the start of LBT by the terminal device in the first cell to the failure of LBT in the first cell, time period information from the failure of LBT by the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of LBT by the terminal device in the first cell to the sending of the first information by the terminal device.

[0269] Optionally, the third parameter includes at least one of the following: indication information of the successful LBT of the terminal device in the first cell, indication information of the failed random access of the terminal device in the first cell, time period information from the start of LBT of the terminal device in the first cell to the successful LBT of the terminal device in the first cell, time period information from the successful LBT of the terminal device in the first cell to the failure of random access of the terminal device in the first cell, time period information from the failure of random access of the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal, and time period information from the failure of random access of the terminal device in the first cell to the sending of the first information.

[0270] Optionally, the CHO command includes information of a candidate cell, the cell selected by the terminal device is the second cell, and the second cell is one of the candidate cells; the processing module 1002 is also used to switch to the second cell when LBT is successful and random access is successful in the second cell; wherein the first information also includes a fourth parameter, and the fourth parameter is related to the success of the CHO caused by the terminal device successfully performing LBT and random access in the second cell.

[0271] Optionally, the fourth parameter includes at least one of the following: indication information of the successful LBT of the terminal device in the second cell, indication information of the successful random access of the terminal device in the second cell, time period information from the start of LBT of the terminal device in the second cell to the successful LBT of the terminal device in the second cell, time period information from the successful LBT of the terminal device in the second cell to the successful random access of the terminal device in the second cell, and time period information from the successful random access of the terminal in the second cell to the sending of the first information by the terminal device.

[0272] Optionally, the CHO command includes information of the candidate cell; the processing module 1002 is further used to initiate an RRC re-establishment process in the third cell when the cell selected by the terminal device is a third cell, and the third cell is a cell other than the candidate cell.

[0273] Optionally, the network device is the source base station, the base station to which the target cell belongs, or the base station to which the candidate cell belongs.

[0274] It should be noted that the implementation of each module can also correspond to the parameters Figure 5-Figure 9 The corresponding description of the method embodiment shown executes the methods and functions performed by the terminal device in the above embodiment.

[0275] like Figure 11 As shown, Figure 1111 is a schematic diagram of the structure of another communication device provided in an embodiment of the present application. The communication device can be a network device, or a chip or processing system in the network device. The device can be used to implement any method and function related to the network device in any of the aforementioned embodiments. The device may include a receiving module 1101, a processing module 1102, and a sending module 1103. Optionally, the receiving module 1101 and the sending module 1103 correspond to the radio frequency circuit and baseband circuit included in the network device. A detailed description of each module is as follows.

[0276] In one embodiment:

[0277] A receiving module 1101 is configured to receive first information, where the first information includes a first parameter, the first parameter being related to the CHO failure caused by a failure of LBT in a target cell, or the first information includes a second parameter, the second parameter being related to the CHO failure caused by a success of LBT in the target cell and a failure of random access;

[0278] The processing module 1102 is used to adjust network parameters according to the first information, where the network parameters include at least one of parameters for conditional switching of terminal equipment between cells and parameters for channel access LBT.

[0279] Optionally, the receiving module 1101 is further configured to receive the first information from a second network device, where the first information is received by the second network device from the terminal device.

[0280] Optionally, the processing module 1102 is further configured to generate second information according to the first information;

[0281] The sending module 1103 is configured to send the second information to a third network device, where the second information is used to instruct the third network device to adjust the network parameters.

[0282] Optionally, the communication device is a source base station, or the communication device is a base station other than the source base station, or the communication device is a core network device.

[0283] In another embodiment:

[0284] A receiving module 1101 is configured to receive first information, where the first information includes a first parameter, where the first parameter is related to the CHO failure caused by RLF occurring in a source cell;

[0285] The processing module 1102 is used to adjust network parameters according to the first information, where the network parameters include at least one of parameters for conditional switching of terminal equipment between cells and parameters for channel access LBT.

[0286] Optionally, the receiving module 1101 is further configured to receive the first information from a second network device, where the first information is received by the second network device from the terminal device.

[0287] Optionally, the processing module 1102 is further configured to generate second information according to the first information;

[0288] The sending module 1103 is configured to send the second information to a third network device, where the second information is used to instruct the third network device to adjust the network parameters.

[0289] Optionally, the communication device is a source base station, or the communication device is a base station other than the source base station, or the communication device is a core network device.

[0290] It should be noted that the implementation of each module can also correspond to the parameters Figure 5-Figure 9 The corresponding description of the method embodiment shown executes the methods and functions performed by the network device in the above embodiment.

[0291] like Figure 12 As shown, Figure 12 12 is a schematic diagram of a terminal device provided in an embodiment of the present application. The terminal device may include: at least one processor 1201, at least one communication interface 1202, at least one memory 1203 and at least one communication bus 1204.

[0292] Among them, the processor 1201 can be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or other programmable logic device, a transistor logic device, a hardware component or any combination thereof. It can implement or execute the various exemplary logic blocks, modules and circuits described in conjunction with the disclosure of this application. The processor can also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processor and a microprocessor, and so on. The communication bus 1204 can be a peripheral component interconnect standard PCI bus or an extended industry standard architecture EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 12It is represented by only one thick line, but it does not mean that there is only one bus or one type of bus. The communication bus 1204 is used to realize the connection and communication between these components. Among them, the communication interface 1202 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 1203 may include volatile memory, such as non-volatile dynamic random access memory (NVRAM), phase change random access memory (PRAM), magnetoresistive random access memory (MRAM), etc., and may also include non-volatile memory, such as at least one disk storage device, electronically erasable programmable read-only memory (EEPROM), flash memory devices, such as NOR flash memory or NAND flash memory, semiconductor devices, such as solid state disk (SSD), etc. The memory 1203 may optionally be at least one storage device located away from the aforementioned processor 1201. The memory 1203 may also optionally store a set of program codes. The processor 1201 may optionally execute a program stored in the memory 1203. The processor may cooperate with the memory and the communication interface to execute any method and function of the terminal device in the above-mentioned application embodiment.

[0293] like Figure 13 As shown, Figure 13 1304 , which is a schematic diagram of a network device according to an embodiment of the present application. The network device may include: at least one processor 1301 , at least one communication interface 1302 , at least one memory 1303 , and at least one communication bus 1304 .

[0294] The processor 1301 may be any of the aforementioned processors. The communication bus 1304 may be a PCI bus or an EISA bus. The bus may be divided into an address bus, a data bus, a control bus, and the like. Figure 13In the figure, only one thick line is used to represent it, but it does not mean that there is only one bus or one type of bus. The communication bus 1304 is used to realize the connection and communication between these components. Among them, the communication interface 1302 of the device in the embodiment of the present application is used to communicate signaling or data with other node devices. The memory 1303 can be the various types of memory mentioned above. The memory 1303 can optionally be at least one storage device located away from the aforementioned processor 1301. A set of program codes is stored in the memory 1303, and the processor 1301 executes the program in the memory 1303. The processor can cooperate with the memory and the communication interface to execute any method and function of the network device in the above-mentioned application embodiment.

[0295] An embodiment of the present application further provides a chip system, which includes a processor for supporting a terminal device or a network device to implement the functions involved in any of the above embodiments, such as generating or processing the first information involved in the above method. In one possible design, the chip system may also include a memory, which is used for program instructions and data necessary for the terminal device or network device. The chip system can be composed of a chip or can include a chip and other discrete devices.

[0296] An embodiment of the present application also provides a processor for coupling with a memory, and for executing any method and function involving a terminal device or a network device in any of the above embodiments.

[0297] An embodiment of the present application also provides a computer program product containing instructions, which, when running on a computer, enables the computer to execute any method and function involving a terminal device or a network device in any of the above embodiments.

[0298] An embodiment of the present application also provides a device for executing any method and function involving a terminal device or a network device in any of the above embodiments.

[0299] An embodiment of the present application also provides a wireless communication system, which includes at least one terminal device and at least one network device involved in any of the above embodiments.

[0300] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the communication device, units or modules within the device described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0301] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrations. The available medium can be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid state disk (SSD)).

[0302] It should be understood that the term "and / or" in this article is merely a description of the association relationship between associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone.

[0303] It should be understood that in the embodiments of the present invention, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B based solely on A; B can also be determined based on A and / or other information.

[0304] The term "plurality" used in the embodiments of the present application refers to two or more.

[0305] The first, second, etc. descriptions appearing in the embodiments of this application are only used for illustration and distinction of the described objects. There is no order, nor does it indicate a special limitation on the number of described objects in the embodiments of this application, and cannot constitute any limitation on the embodiments of this application.

[0306] It is understood that in the embodiments of the present application, the terminal device and / or the network device may perform some or all of the steps in the embodiments of the present application. These steps or operations are merely examples. In the embodiments of the present application, other operations or variations of various operations may also be performed. In addition, the various steps may be performed in a different order than those presented in the embodiments of the present application, and it is possible that not all of the operations in the embodiments of the present application need to be performed.

[0307] The above-described specific implementation methods further illustrate the purpose, technical solutions and beneficial effects of this application. Any modifications, equivalent replacements, improvements, etc. made within the principles of this application shall be included in the scope of protection of this application.

Claims

1. A communication method, characterized in that: The method comprises: The terminal device receives a conditional handover CHO command from a source base station, and the terminal device determines to switch from the source cell to the target cell according to the CHO command; When the terminal device fails to perform channel access LBT in the target cell, or succeeds in LBT in the target cell but fails in random access, the terminal device performs cell selection; The terminal device sends first information to the network device, the first information includes a first parameter, the first parameter is related to the failure of CHO caused by the failure of LBT in the target cell, or the first information includes a second parameter, the second parameter is related to the failure of CHO caused by the success of LBT in the target cell and the failure of random access.

2. The method according to claim 1, wherein The first parameter includes at least one of the following: The target cell meets the execution conditions of the CHO command but the indication information of LBT failure in the target cell, the time period information from the terminal device receiving the CHO command to determining the target cell, and the time period information from the determination of the target cell to the terminal device failing to perform LBT in the target cell.

3. The method according to claim 1, wherein The second parameter includes at least one of the following: The information indicating that the target cell meets the execution conditions of the CHO command and that LBT is successfully performed in the target cell, the information indicating that the terminal device fails to perform random access to the target cell, the time period from when the terminal device receives the CHO command to when the target cell is determined, the time period from when the target cell is determined to when the terminal device successfully performs LBT in the target cell, and the time period from when the terminal device successfully performs LBT in the target cell to when the terminal device fails to perform random access to the target cell.

4. The method according to any one of claims 1 to 3, wherein The CHO command includes information about candidate cells, the cell selected by the terminal device is a first cell, and the first cell is one of the candidate cells. The method further includes: When LBT fails in the first cell, or when LBT succeeds in the first cell and random access fails, the terminal device initiates a radio resource control RRC re-establishment process; When the terminal device fails to perform channel access LBT in the first cell, the first information further includes a third parameter, and the third parameter is related to the CHO failure caused by the failure of the terminal device to perform LBT in the first cell; or When the terminal device successfully performs LBT in the first cell and fails random access, the first information also includes a fourth parameter, and the fourth parameter is related to the CHO failure caused by the terminal device successfully performing LBT in the first cell and failing random access.

5. The method according to claim 4, wherein The third parameter includes at least one of the following: The indication information of the terminal device's failure to perform LBT in the first cell, the time period information from the start of the terminal device's LBT in the first cell to the failure of LBT in the first cell, the time period information from the failure of LBT in the first cell to the terminal device initiating the RRC re-establishment process, and the time period information from the failure of LBT in the first cell to the terminal device sending the first information.

6. The method according to claim 4, wherein The fourth parameter includes at least one of the following: Indication information of the successful LBT of the terminal device in the first cell, indication information of the failure of random access of the terminal device in the first cell, time period information from the start of LBT of the terminal device in the first cell to the successful LBT of the terminal device in the first cell, time period information from the successful LBT of the terminal device in the first cell to the failure of random access of the terminal device in the first cell, time period information from the failure of random access of the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of random access of the terminal device in the first cell to the sending of the first information by the terminal device.

7. The method according to any one of claims 1 to 3, wherein: The CHO command includes information about a candidate cell, the cell selected by the terminal device is a second cell, and the second cell is one of the candidate cells. The method further includes: When the terminal device successfully performs LBT and random access in the second cell, the terminal device switches to the second cell; The first information further includes a fifth parameter, and the fifth parameter is related to the success of the CHO caused by the terminal device successfully performing LBT and random access in the second cell.

8. The method according to claim 7, wherein The fifth parameter includes at least one of the following: The indication information that the terminal device successfully performs LBT in the second cell, the indication information that the terminal device successfully performs random access in the second cell, the time period information from the start of LBT in the second cell to the successful LBT in the second cell, the time period information from the successful LBT in the second cell to the successful random access in the second cell by the terminal device, and the time period information from the successful random access of the terminal in the second cell to the sending of the first information by the terminal device.

9. The method according to any one of claims 1 to 3, wherein: The CHO command includes indication information of the candidate cell, and the method further includes: When the cell selected by the terminal device is a third cell, the terminal device initiates an RRC re-establishment process in the third cell, and the third cell is a cell other than the candidate cell.

10. The method according to any one of claims 1 to 3, wherein The network device is the source base station, the base station to which the target cell belongs, or the base station to which a candidate cell belongs.

11. A communication method, characterized in that: The method comprises: The first network device receives first information, where the first information includes a first parameter, and the first parameter is related to a CHO failure caused by a failure of LBT in a target cell, or the first information includes a second parameter, and the second parameter is related to the CHO failure caused by a success of LBT in the target cell and a failure of random access; The first network device adjusts network parameters according to the first information, where the network parameters include at least one of parameters for conditional switching of the terminal device between cells and parameters for channel access LBT.

12. The method according to claim 11, wherein The first network device receiving the first information includes: The first network device receives the first information from the second network device, where the first information is received by the second network device from the terminal device.

13. The method according to claim 11, wherein The method further comprises: The first network device generates second information according to the first information; The first network device sends the second information to the third network device, where the second information is used to instruct the third network device to adjust the network parameter.

14. The method according to any one of claims 11 to 13, wherein: The first network device is a source base station, or the first network device is a base station other than the source base station, or the first network device is a core network device.

15. A communication method, characterized in that: The method comprises: The terminal device receives a conditional handover (CHO) command from a source base station. Before the terminal device determines a target cell, a radio link failure (RLF) occurs in the source cell. The terminal device performs cell selection, where the target cell is obtained according to the CHO command. The CHO command includes information about candidate cells. The cell selected by the terminal device is a first cell, which is one of the candidate cells. The terminal device sends first information to the network device, the first information including a first parameter, the first parameter being related to the CHO failure caused by the RLF occurring in the source cell; when the terminal device fails to perform LBT in the first cell, the first information also including a second parameter, the second parameter being related to the CHO failure caused by the LBT failure of the terminal device in the first cell; or, when the terminal device successfully performs LBT in the first cell and fails random access, the first information also including a third parameter, the third parameter being related to the CHO failure caused by the successful LBT of the terminal device in the first cell and failure of random access.

16. The method according to claim 15, wherein The first parameter includes at least one of the following: The indication information of the RLF occurrence in the source cell, and the time period from the terminal device receiving the CHO command to the RLF occurrence in the source cell.

17. The method according to claim 15 or 16, wherein: The method further comprises: When the terminal device fails to perform LBT in the first cell, or succeeds in performing LBT in the first cell but fails in random access, the terminal device initiates an RRC re-establishment process.

18. The method according to claim 15, wherein The second parameter includes at least one of the following: The indication information of the terminal device's failure to perform LBT in the first cell, the time period information from the start of the terminal device's LBT in the first cell to the failure of LBT in the first cell, the time period information from the failure of LBT in the first cell to the initiation of the RRC re-establishment process by the terminal device, and the time period information from the failure of LBT in the first cell to the sending of the first information by the terminal device.

19. The method according to claim 15, wherein The third parameter includes at least one of the following: Indication information of the successful LBT of the terminal device in the first cell, indication information of the failure of random access of the terminal device in the first cell, time period information from the start of LBT of the terminal device in the first cell to the successful LBT of the terminal device in the first cell, time period information from the successful LBT of the terminal device in the first cell to the failure of random access of the terminal device in the first cell, time period information from the failure of random access of the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of random access of the terminal device in the first cell to the sending of the first information by the terminal device.

20. The method according to claim 15 or 16, wherein The CHO command includes information about a candidate cell, the cell selected by the terminal device is a second cell, and the second cell is one of the candidate cells. The method further includes: When LBT is successful and random access is successful in the second cell, the terminal device switches to the second cell; The first information further includes a fourth parameter, and the fourth parameter is related to the success of the CHO caused by the terminal device successfully performing LBT and random access in the second cell.

21. The method according to claim 20, wherein The fourth parameter includes at least one of the following: The indication information that the terminal device successfully performs LBT in the second cell, the indication information that the terminal device successfully performs random access in the second cell, the time period information from the start of LBT in the second cell to the successful LBT in the second cell, the time period information from the successful LBT in the second cell to the successful random access in the second cell by the terminal device, and the time period information from the successful random access of the terminal in the second cell to the sending of the first information by the terminal device.

22. The method according to claim 15 or 16, wherein: The CHO command includes information about candidate cells, and the method further includes: When the cell selected by the terminal device is a third cell, the terminal device initiates an RRC re-establishment process in the third cell, and the third cell is a cell other than the candidate cell.

23. The method according to claim 15 or 16, wherein: The network device is the source base station, the base station to which the target cell belongs, or the base station to which a candidate cell belongs.

24. A communication method, characterized in that: The method comprises: A first network device receives first information, where the first information includes a first parameter, the first parameter being related to a CHO failure caused by an RLF occurring in a source cell, the first information also including a second parameter, the second parameter being related to the CHO failure caused by a LBT failure performed by a terminal device in a first cell, or the first information also including a third parameter, the third parameter being related to the CHO failure caused by a LBT success and random access failure performed by the terminal device in the first cell, where the first cell is one of the candidate cells; The first network device adjusts network parameters according to the first information, where the network parameters include at least one of parameters for conditional switching of the terminal device between cells and parameters for channel access LBT.

25. The method of claim 24, wherein: The first network device receiving the first information includes: The first network device receives the first information from the second network device, where the first information is received by the second network device from the terminal device.

26. The method of claim 24, wherein: The method further comprises: The first network device generates second information according to the first information; The first network device sends the second information to the third network device, where the second information is used to instruct the third network device to adjust the network parameters.

27. The method according to any one of claims 24 to 26, wherein: The first network device is a source base station, or the first network device is a base station other than the source base station, or the first network device is a core network device.

28. A communication device, characterized in that: The device comprises: a receiving module, configured to receive a conditional handover (CHO) command from a source base station, and determine to switch from the source cell to the target cell according to the CHO command; A processing module, configured to perform cell selection when the terminal device fails to perform channel access LBT in the target cell, or succeeds in LBT in the target cell but fails in random access; A sending module is used to send first information to a network device, where the first information includes a first parameter, and the first parameter is related to the CHO failure caused by the failure of LBT in the target cell, or the first information includes a second parameter, and the second parameter is related to the CHO failure caused by the success of LBT in the target cell and the failure of random access.

29. The device according to claim 28, wherein The first parameter includes at least one of the following: The target cell meets the execution conditions of the CHO command but the indication information of LBT failure in the target cell, the time period information from the terminal device receiving the CHO command to determining the target cell, and the time period information from the determination of the target cell to the terminal device failing to perform LBT in the target cell.

30. The device according to claim 28, wherein The second parameter includes at least one of the following: The information indicating that the target cell meets the execution conditions of the CHO command and that LBT is successfully performed in the target cell, the information indicating that the terminal device fails to perform random access to the target cell, the time period from when the terminal device receives the CHO command to when the target cell is determined, the time period from when the target cell is determined to when the terminal device successfully performs LBT in the target cell, and the time period from when the terminal device successfully performs LBT in the target cell to when the terminal device fails to perform random access to the target cell.

31. The device according to any one of claims 28 to 30, characterized in that The CHO command includes information of candidate cells, the cell selected by the terminal device is a first cell, and the first cell is one of the candidate cells; The processing module is further configured to initiate a radio resource control RRC re-establishment process when LBT fails in the first cell, or when LBT succeeds in the first cell and random access fails; When the terminal device fails to perform channel access LBT in the first cell, the first information further includes a third parameter, and the third parameter is related to the CHO failure caused by the failure of the terminal device to perform LBT in the first cell; or When the terminal device successfully performs LBT in the first cell and fails random access, the first information also includes a fourth parameter, and the fourth parameter is related to the CHO failure caused by the terminal device successfully performing LBT in the first cell and failing random access.

32. The device according to claim 31, wherein The third parameter includes at least one of the following: The indication information of the terminal device's failure to perform LBT in the first cell, the time period information from the start of the terminal device's LBT in the first cell to the failure of LBT in the first cell, the time period information from the failure of LBT in the first cell to the terminal device initiating the RRC re-establishment process, and the time period information from the failure of LBT in the first cell to the terminal device sending the first information.

33. The device according to claim 31, wherein The fourth parameter includes at least one of the following: Indication information of the successful LBT of the terminal device in the first cell, indication information of the failure of random access of the terminal device in the first cell, time period information from the start of LBT of the terminal device in the first cell to the successful LBT of the terminal device in the first cell, time period information from the successful LBT of the terminal device in the first cell to the failure of random access of the terminal device in the first cell, time period information from the failure of random access of the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of random access of the terminal device in the first cell to the sending of the first information by the terminal device.

34. The device according to any one of claims 28 to 30, characterized in that The CHO command includes information of a candidate cell, the cell selected by the terminal device is the second cell, and the second cell is one of the candidate cells; The processing module is also used to switch to the second cell when the terminal device successfully performs LBT and random access in the second cell; wherein the first information also includes a fifth parameter, and the fifth parameter is related to the success of the CHO caused by the terminal device successfully performing LBT and random access in the second cell.

35. The device according to claim 34, wherein The fifth parameter includes at least one of the following: The indication information that the terminal device successfully performs LBT in the second cell, the indication information that the terminal device successfully performs random access in the second cell, the time period information from the start of LBT in the second cell to the successful LBT in the second cell, the time period information from the successful LBT in the second cell to the successful random access in the second cell by the terminal device, and the time period information from the successful random access of the terminal in the second cell to the sending of the first information by the terminal device.

36. The device according to any one of claims 28 to 30, characterized in that The CHO command includes indication information of the candidate cell; The processing module is further configured to initiate an RRC re-establishment process in a third cell when the cell selected by the terminal device is a third cell, and the third cell is a cell other than the candidate cell.

37. The device according to any one of claims 28 to 30, characterized in that The network device is the source base station, the base station to which the target cell belongs, or the base station to which a candidate cell belongs.

38. A communication device, characterized in that: The device comprises: a receiving module, configured to receive first information, where the first information includes a first parameter, the first parameter being related to a CHO failure caused by a failure of LBT in a target cell, or the first information includes a second parameter, the second parameter being related to a CHO failure caused by a success of LBT in the target cell and a failure of random access; A processing module is used to adjust network parameters according to the first information, where the network parameters include at least one of parameters for conditional switching of terminal equipment between cells and parameters for channel access LBT.

39. The device according to claim 38, wherein The receiving module is further configured to receive the first information from a second network device, where the first information is received by the second network device from the terminal device.

40. The device according to claim 38, wherein The processing module is further configured to generate second information based on the first information; The device further comprises: A sending module is used to send the second information to a third network device, where the second information is used to instruct the third network device to adjust the network parameters.

41. The device according to any one of claims 38 to 40, characterized in that: The communication device is a source base station, or the communication device is a base station other than the source base station, or the communication device is a core network device.

42. A communication device, characterized in that The device comprises: A receiving module, configured to receive a conditional handover CHO command from a source base station; a processing module, configured to perform cell selection when a radio link failure (RLF) occurs in a source cell before the terminal device determines a target cell, where the target cell is obtained according to the CHO command, the CHO command includes information about candidate cells, and the cell selected by the terminal device is a first cell, which is one of the candidate cells; A sending module is used to send first information to a network device, where the first information includes a first parameter, and the first parameter is related to the CHO failure caused by the RLF occurring in the source cell; when the terminal device fails to perform LBT in the first cell, the first information also includes a second parameter, and the second parameter is related to the CHO failure caused by the LBT failure of the terminal device in the first cell; or, when the terminal device successfully performs LBT in the first cell and fails random access, the first information also includes a third parameter, and the third parameter is related to the CHO failure caused by the successful LBT of the terminal device in the first cell and failure random access.

43. The device according to claim 42, wherein The first parameter includes at least one of the following: The indication information of the RLF occurrence in the source cell, and the time period from the terminal device receiving the CHO command to the RLF occurrence in the source cell.

44. The device according to claim 42 or 43, characterized in that The processing module is used to initiate an RRC re-establishment process when the terminal device fails to perform LBT in the first cell, or succeeds in LBT in the first cell but fails in random access.

45. The device according to claim 42, wherein The second parameter includes at least one of the following: The indication information of the terminal device's failure to perform LBT in the first cell, the time period information from the start of the terminal device's LBT in the first cell to the failure of LBT in the first cell, the time period information from the failure of LBT in the first cell to the initiation of the RRC re-establishment process by the terminal device, and the time period information from the failure of LBT in the first cell to the sending of the first information by the terminal device.

46. ​​The device according to claim 42, wherein The third parameter includes at least one of the following: Indication information of the successful LBT of the terminal device in the first cell, indication information of the failure of random access of the terminal device in the first cell, time period information from the start of LBT of the terminal device in the first cell to the successful LBT of the terminal device in the first cell, time period information from the successful LBT of the terminal device in the first cell to the failure of random access of the terminal device in the first cell, time period information from the failure of random access of the terminal device in the first cell to the initiation of the RRC re-establishment process by the terminal device, and time period information from the failure of random access of the terminal device in the first cell to the sending of the first information by the terminal device.

47. The device according to claim 42 or 43, characterized in that The CHO command includes information of a candidate cell, the cell selected by the terminal device is the second cell, and the second cell is one of the candidate cells; The processing module is also used to switch to the second cell when LBT is successful and random access is successful in the second cell; wherein the first information also includes a fourth parameter, and the fourth parameter is related to the success of the CHO caused by the terminal device successfully performing LBT and random access in the second cell.

48. The device according to claim 47, wherein The fourth parameter includes at least one of the following: The indication information that the terminal device successfully performs LBT in the second cell, the indication information that the terminal device successfully performs random access in the second cell, the time period information from the start of LBT in the second cell to the successful LBT in the second cell, the time period information from the successful LBT in the second cell to the successful random access in the second cell by the terminal device, and the time period information from the successful random access of the terminal in the second cell to the sending of the first information by the terminal device.

49. The device according to claim 42 or 43, characterized in that The CHO command includes information of candidate cells; The processing module is further configured to initiate an RRC re-establishment process in a third cell when the cell selected by the terminal device is a third cell, and the third cell is a cell other than the candidate cell.

50. The device according to claim 42 or 43, characterized in that The network device is the source base station, the base station to which the target cell belongs, or the base station to which a candidate cell belongs.

51. A communication device, characterized in that The device comprises: a receiving module, configured to receive first information, where the first information includes a first parameter, the first parameter being related to a CHO failure caused by an RLF occurring in a source cell, the first information also including a second parameter, the second parameter being related to the CHO failure caused by a LBT failure of a terminal device in a first cell, or the first information also including a third parameter, the third parameter being related to the CHO failure caused by a LBT success and random access failure of the terminal device in the first cell, where the first cell is one of the candidate cells; A processing module is used to adjust network parameters according to the first information, where the network parameters include at least one of parameters for conditional switching of terminal equipment between cells and parameters for channel access LBT.

52. The device according to claim 51, wherein The receiving module is further configured to receive the first information from a second network device, where the first information is received by the second network device from the terminal device.

53. The device according to claim 51, wherein The processing module is further configured to generate second information based on the first information; The device further comprises: A sending module is used to send the second information to a third network device, where the second information is used to instruct the third network device to adjust the network parameters.

54. The device according to any one of claims 51 to 53, characterized in that: The communication device is a source base station, or the communication device is a base station other than the source base station, or the communication device is a core network device.

55. A computer-readable storage medium, characterized in that Used to store instructions, which, when executed on a computer, cause the computer to execute the method according to any one of claims 1 to 27.

56. A chip, characterized in that The chip comprises a processor and a memory, wherein the memory is used to store instructions, and the processor executes the instructions to enable the chip to perform the method according to any one of claims 1 to 27.

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