Information transmission method, apparatus, device, storage medium and computer program product

Abstract

Disclosed in the present application are an information transmission method, an apparatus, a device, a storage medium and a computer program product. The method comprises: a terminal sending first information to a network device, wherein the first information represents related information of the terminal executing layer 1 or layer 2 triggered mobility (LTM) cell handover.

Description

Information transmission method, device, equipment, storage medium and computer program product

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This disclosure is based on and claims the priority of Chinese patent application with application number 202410268879.1 and application date March 8, 2024. The entire content of the Chinese patent application is hereby incorporated into this application by reference. Technical Field

[0003] The present application relates to the field of wireless communication technologies, and in particular to an information transmission method, apparatus, device, storage medium, and computer program product. Background Art

[0004] Currently, to address the frequent user equipment (UE) handovers caused by high-frequency 5G deployments, a Layer 1 (L1) / Layer 2 (L2) handover enhancement mechanism, known as Layer 1 / L2 Triggered Mobility (LTM), has been introduced to save time during the Layer 3 (L3) handover process. L1 / L2 handover is particularly suitable for small cells deployed at high frequencies or for high-speed mobility scenarios with frequent handovers. However, in some cases, a Radio Resource Control (RRC) connection may not be successfully established with the target cell, or a Radio Link Failure (RLF) may occur in the target cell soon after an RRC connection is established due to premature handover, thereby reducing LTM cell handover performance. Summary of the Invention

[0005] In view of this, embodiments of the present application provide an information transmission method, apparatus, device, storage medium, and computer program product.

[0006] An embodiment of the present application provides an information transmission method, which is executed by a terminal, and the method includes:

[0007] Sending first information to a network device; the first information represents relevant information of the terminal performing LTM cell switching.

[0008] In addition, according to at least one embodiment of the present application, the first information includes one or more of the following:

[0009] First instruction information;

[0010] Second instruction information;

[0011] Third instruction information;

[0012] Fourth instruction information;

[0013] Fifth instruction information;

[0014] Sixth instruction information;

[0015] Seventh instruction information;

[0016] in,

[0017] The first indication information represents the number of times the terminal receives a physical downlink control channel (PDCCH) instruction, where the PDCCH instruction is used to instruct the terminal to obtain a timing advance (TA) of a target cell in advance, or a time difference between a first moment when the terminal first receives the PDCCH instruction and a third moment when the terminal receives an LTM cell handover command, or a time difference between a second moment when the terminal sends a random access preamble and a third moment when the terminal receives the LTM cell handover command;

[0018] The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference;

[0019] The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover;

[0020] The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails;

[0021] The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover;

[0022] The sixth indication information represents a time difference between a seventh moment of receiving RRC signaling and an eighth moment of switching the terminal to the LTM candidate cell or target configuration; the RRC signaling carries the relevant configuration of LTM; or a time difference between a third moment of receiving the LTM cell handover command and a ninth moment of switching the terminal to the target configuration;

[0023] The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive random access (RA) resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is a supplementary uplink carrier (SUL) or a normal uplink carrier (NUL); a random access preamble code index; a synchronization signal (Synchronization Signal) index or a physical broadcast channel (PBCH) index; a physical random access channel (PRACH) mask index.

[0024] In addition, according to at least one embodiment of the present application, the method further includes:

[0025] When the LTM cell handover meets the LTM cell handover success condition, the first information is recorded.

[0026] In addition, according to at least one embodiment of the present application, the method further includes:

[0027] Under the LTM cell switching configuration of the network device, the first information is recorded.

[0028] In addition, according to at least one embodiment of the present application, the method further includes:

[0029] After the terminal fails to perform LTM cell handover, if the terminal performs cell selection but fails to select an LTM candidate cell, the first information is recorded in the cell reconstruction process.

[0030] In addition, according to at least one embodiment of the present application, sending the first information to the network device includes:

[0031] The first information is sent to the network device during the process of the terminal entering the connected state or after the terminal enters the connected state.

[0032] In addition, according to at least one embodiment of the present application, sending the first information to the network device during or after the terminal enters the connected state includes:

[0033] When the terminal successfully performs LTM cell switching, if the target cell to which the LTM cell switching is successful sends a first request to the terminal, the first information is sent to the network device corresponding to the target cell to which the LTM cell switching is successful; the first request is used to request the terminal to report information related to the execution of LTM cell switching.

[0034] In addition, according to at least one embodiment of the present application, sending the first information to the network device during or after the terminal enters the connected state includes:

[0035] In the event that the terminal fails to perform LTM cell switching, if the first cell to which the terminal is successfully connected sends a second request to the terminal, the first information is sent to the network device corresponding to the first cell; wherein the second request is used to request the terminal to report information related to the success or failure of performing LTM cell switching, and the network device corresponding to the first cell forwards the first information to the source network device or the target network device.

[0036] At least one embodiment of the present application provides an information transmission method, performed by a network device, the method comprising:

[0037] Receive first information sent by a terminal; the first information represents relevant information of the terminal performing LTM cell switching.

[0038] In addition, according to at least one embodiment of the present application, the first information includes one or more of the following:

[0039] First instruction information;

[0040] Second instruction information;

[0041] Third instruction information;

[0042] Fourth instruction information;

[0043] Fifth instruction information;

[0044] Sixth instruction information;

[0045] Seventh instruction information;

[0046] in,

[0047] The first indication information represents the number of times the terminal receives a PDCCH instruction, where the PDCCH instruction is used to instruct the terminal to obtain the TA of the target cell in advance, or the time difference between a first moment when the terminal first receives the PDCCH instruction and a third moment when the terminal receives the LTM cell handover command, or the time difference between a second moment when the terminal sends a random access preamble and a third moment when the terminal receives the LTM cell handover command;

[0048] The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference;

[0049] The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover;

[0050] The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails;

[0051] The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover;

[0052] The sixth indication information represents a time difference between a seventh moment of receiving RRC signaling and an eighth moment of switching the terminal to the LTM candidate cell or target configuration; the RRC signaling carries the relevant configuration of LTM; or a time difference between a third moment of receiving the LTM cell handover command and a ninth moment of switching the terminal to the target configuration;

[0053] The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive RA resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is SUL or NUL; random access preamble code index; synchronization signal index or PBCH index; PRACH mask index.

[0054] In addition, according to at least one embodiment of the present application, the method further includes:

[0055] Do at least one of the following:

[0056] Based on the first indication information, configure a random access preamble corresponding to a target cell for LTM cell handover;

[0057] Determining, based on the second indication information, a timing for sending an LTM cell handover command, and determining whether to assist the terminal in measuring a TA;

[0058] Based on the third indication information, configure the timer duration corresponding to the LTM cell handover;

[0059] Selecting a target cell for LTM cell handover for the terminal based on the fourth indication information;

[0060] Based on the fifth indication information, configure a target cell for LTM cell handover;

[0061] Determining, based on the sixth indication information, a timing for configuring a target cell for LTM cell handover;

[0062] Based on the seventh indication information, it is determined whether to configure non-contention RA resources for the terminal, and whether the configured RA resources are reasonable when the non-contention RA resources are configured.

[0063] In addition, according to at least one embodiment of the present application, the first information sent by the receiving terminal includes:

[0064] The first information sent by the terminal is received during the process of the terminal entering the connected state or after the terminal enters the connected state.

[0065] In addition, according to at least one embodiment of the present application, the network device is a network device corresponding to the target cell in which the LTM cell handover is successful; and the receiving the first information sent by the terminal during or after the terminal enters the connected state includes:

[0066] When the terminal successfully performs LTM cell switching, a first request is sent to the terminal, and the first information sent by the terminal is received; the first request is used to request the terminal to report information related to performing LTM cell switching.

[0067] In addition, according to at least one embodiment of the present application, the network device is a network device corresponding to the first cell; and the receiving the first information sent by the terminal during or after the terminal enters the connected state includes:

[0068] In the event that the terminal fails to perform LTM cell switching, a second request is sent to the terminal, the first information sent by the terminal is received, and the first information is forwarded to the source network device or the candidate target network device; wherein the second request is used to request the terminal to report information related to performing LTM cell switching.

[0069] At least one embodiment of the present application provides an information transmission device, including:

[0070] The sending module is used to send first information to the network device; the first information represents relevant information of the terminal performing LTM cell switching.

[0071] At least one embodiment of the present application provides an information transmission device, including:

[0072] The receiving module is configured to receive first information sent by a terminal; the first information represents relevant information of the terminal performing LTM cell switching.

[0073] At least one embodiment of the present application provides a terminal, including a processor and a memory for storing a computer program that can be run on the processor.

[0074] Wherein, when the processor is used to run the computer program, it executes the steps of any one of the methods described above on the terminal side.

[0075] At least one embodiment of the present application provides a network device, including a processor and a memory for storing a computer program that can be run on the processor.

[0076] Wherein, when the processor is used to run the computer program, it executes the steps of any one of the methods described above on the network device side.

[0077] At least one embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program implements the steps of any of the above methods when executed by a processor.

[0078] An embodiment of the present application further provides a computer program product, including a computer program, which, when executed by a processor, implements any of the methods described above on the terminal side, or implements any of the methods described above on the network device side.

[0079] The information transmission method, apparatus, device, storage medium and computer program product provided by the embodiments of the present application include: a terminal sends first information to a network device; the first information represents relevant information of the terminal performing LTM cell switching.

[0080] By adopting the technical solution provided in the embodiment of the present application, the terminal reports relevant information of the LTM cell switching to the network device, which can help the network side optimize the LTM cell switching related timer, LTM candidate cell configuration, etc., thereby improving the switching performance of LTM, and can avoid the related technology in some cases where the RRC connection cannot be successfully established with the target cell, or due to premature switching, the RRC connection is established and then the radio link fails in the target cell soon. BRIEF DESCRIPTION OF THE DRAWINGS

[0081] FIG1 is a schematic diagram of a first implementation flow of an information transmission method according to an embodiment of the present application;

[0082] FIG2 is a second schematic diagram of the implementation flow of the information transmission method according to an embodiment of the present application;

[0083] FIG3 is a schematic diagram of the first structure of the information transmission device according to an embodiment of the present application;

[0084] FIG4 is a second schematic diagram of the structure of the information transmission device according to an embodiment of the present application;

[0085] FIG5 is a schematic diagram of the structure of a terminal according to an embodiment of the present application;

[0086] FIG6 is a schematic diagram of the composition structure of the network device according to an embodiment of the present application. DETAILED DESCRIPTION

[0087] Before introducing the technical solutions of the embodiments of the present application, the relevant technologies are first introduced.

[0088] In the related art, the basic process of traditional L3 handover includes the following main steps: first, the UE reports the measurement results after layer 3 filtering to the source base station; second, the source base station decides to handover the UE based on the measurement results and initiates a handover request to one or more potential target base stations; third, the target base station performs admission control on the UE. If the admission control is successful, it sends a handover confirmation message to the source base station, which carries the RRC message sent to the UE for executing the handover.

[0089] Currently, in response to the frequent UE handovers caused by high-frequency 5G deployment scenarios, an L1 / L2-based handover enhancement mechanism has been introduced to save time in the above handover process. That is, the source base station configures the UE with RRC configuration information of multiple candidate target cells, and then sends a cell switch media access control (MAC) control element (CE) command to the UE based on the beam measurement results of the SSB and / or CSI-RS of Layer 1 reported by the UE. The UE applies the RRC configuration of the corresponding candidate target cell according to the handover command, that is, initiates the handover process to the target cell.

[0090] In addition, to further reduce handover latency, the UE can also synchronize the uplink and / or downlink of the target cell in advance based on network assistance or its own capabilities to obtain the time advance (TA). This way, after receiving the cell switch command, it does not need to perform a random access process to obtain the time advance (TA). When the LTM cell handover does not succeed or fails within a certain time period T, the UE performs cell selection. If the selected cell is a candidate target cell for LTM and the network side is configured to allow the UE to retry LTM, the UE can retry LTM once; otherwise, the UE performs the re-establishment process.

[0091] This MAC CE-based L1 / L2 handover reduces the UE's time for Layer 3 filtering of measurement results, the negotiation time between the source and target base stations, and resource preparation. Furthermore, the conversion of the handover command sent by the source base station to the UE via an RRC message to a MAC CE also saves tens of milliseconds. Therefore, L1 / L2 handover is particularly suitable for high-frequency deployments of small cells or for high-speed mobility scenarios with frequent handovers.

[0092] However, since the L1 / L2 switching mechanism is based on the UE's L1 measurement results, and the L1 measurement results change very quickly, the UE performs LTM switching based on the L1 measurement results. In some cases, it is very likely that an RRC connection cannot be successfully established with the target cell (i.e., handover failure) or that a radio link failure RLF (i.e., premature handover) occurs in the target cell soon after the RRC connection is established.

[0093] An embodiment of the present application proposes a method for UE to record and report information related to LTM cell handover failure or success, which helps the network side optimize LTM cell handover related timers, LTM candidate cell configuration, etc., thereby improving LTM handover performance.

[0094] Based on this, in an embodiment of the present application, the terminal sends first information to the network device; the first information represents relevant information of the terminal performing LTM cell switching.

[0095] Referring to FIG. 1 , FIG. 1 is a schematic diagram of an implementation flow of an information transmission method according to an embodiment of the present application, which is applied to a terminal, where the terminal may refer to a user equipment (UE). As shown in FIG. 1 , the method includes:

[0096] Step 101: Send first information to a network device; the first information represents relevant information of the terminal performing LTM cell handover.

[0097] As an example, the first information may represent relevant information of whether the terminal successfully or failed to perform LTM cell handover.

[0098] In the embodiment of the present application, the LTM cell switching can also be described as L1 / L2-based cell switching, or LTM switching, or cell switching, etc. These terms all express the same meaning.

[0099] As an example, the terminal can record and report relevant information on the failure or success of the terminal in performing LTM cell switching, helping the network side to optimize LTM cell switching related timers, LTM candidate cell configuration, etc., to improve LTM cell switching performance.

[0100] In some embodiments, the first information includes one or more of the following:

[0101] First instruction information;

[0102] Second instruction information;

[0103] Third instruction information;

[0104] Fourth instruction information;

[0105] Fifth instruction information;

[0106] Sixth instruction information;

[0107] Seventh instruction information;

[0108] in,

[0109] The first indication information represents the number of times the terminal receives a physical downlink control channel (PDCCH) instruction, where the PDCCH instruction is used to instruct the terminal to obtain the (timing advance) TA of the target cell in advance, or the time difference between a first time when the terminal first receives the PDCCH instruction and a third time when the terminal receives the LTM cell handover command, or the time difference between a second time when the terminal sends a random access preamble and a third time when the terminal receives the LTM cell handover command;

[0110] The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference;

[0111] The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover;

[0112] The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails;

[0113] The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover;

[0114] The sixth indication information represents a time difference between a seventh moment of receiving a radio resource control (RRC) signaling and an eighth moment of switching the terminal to an LTM candidate cell or a target configuration; the RRC signaling carries a relevant configuration of LTM; or a time difference between a third moment of receiving an LTM cell handover command and a ninth moment of switching the terminal to the target configuration;

[0115] The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive random access (RA) resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is a secondary uplink carrier (SUL) or a normal uplink carrier (NUL); a random access preamble code index; a synchronization signal index or a physical broadcast channel (PBCH) index; and a physical random access channel (PRACH) mask index.

[0116] In the embodiments of the present application, the LTM candidate cell may also be described as an LTM candidate target cell, and these terms all express the same meaning.

[0117] As an example, the first indication information may be used to evaluate the congestion of the random access preamble of the target cell, and to help the network side optimize the configuration of the random access preamble corresponding to the target cell of the LTM cell handover.

[0118] Here, the first indication information may include:

[0119] In the case where the network assists the terminal in measuring the TA, the terminal records the number of times it receives the PDCCH instruction (order) sent by the source network device on the network side, where the PDCCH instruction is used to instruct the terminal to obtain the TA of the target cell in advance, or the time difference between the first moment when the terminal first receives the PDCCH instruction (order) sent by the source network device and the third moment when the terminal receives the LTM cell switch command sent by the source network device, or the time difference between the second moment when the terminal sends the random access preamble (preamble) to the target network device and the third moment when the terminal receives the LTM cell switch command sent by the source network device.

[0120] Here, the terminal receives a PDCCH instruction sent by the source network device before receiving the LTM cell switching command.

[0121] Here, the LTM cell switching command may refer to a cell switching command sent by a source network device and received by the terminal during the LTM cell switching process, where the cell switching command is used to instruct the terminal to perform LTM cell switching.

[0122] Here, if the terminal is supported to obtain the TA in advance, the terminal reports the time difference between the first moment of receiving the PDCCH instruction (order) sent by the source network device and the third moment of receiving the LTM cell switching (cell switch) command sent by the source network device; if the terminal is not supported to obtain the TA in advance, the terminal reports the time difference between the third moment of receiving the LTM cell switching (cell switch) command sent by the source network device and the first moment of receiving the PDCCH instruction (order) sent by the source network device for the first time.

[0123] Specifically, if the number of times the terminal receives the PDCCH order sent by the source network device (such as the source base station) is greater than the number threshold (the number is large), such as more than 5 times, or the time difference between the first moment of receiving the PDCCH order for the first time and the third moment of receiving the LTM cell switch command sent by the source network device is greater than the first time difference threshold (the time difference is long), such as more than 20ms, or the time difference between the second moment when the terminal sends the random access preamble to the target network device and the third moment when the LTM cell switch command is received is greater than the second time difference threshold (the time difference is long), such as more than 20ms, then it means that the random access preamble of the target cell has more collisions, that is, multiple terminals use the same random access code to access the target cell at the same time. Therefore, more random access preambles need to be configured for the target cell.

[0124] Here, the target network device (such as the target base station) may optimize and configure the random access preamble corresponding to the target cell of the LTM cell handover according to the first indication information.

[0125] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information includes the first indication information, the target network device optimizes and configures the random access preamble corresponding to the target cell to which the LTM cell switching is successfully performed according to the first indication information.

[0126] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the first indication information, the network device corresponding to the first cell forwards the first indication information to the candidate target network device, and the candidate target network device optimizes and configures the random access preamble corresponding to the target cell of the LTM cell switching according to the first indication information.

[0127] As an example, the second indication information can be used to assess whether the timing of sending an LTM cell switch command is appropriate; and to help the network determine the accuracy of the terminal's TA acquisition, thereby determining whether to assist the terminal in measuring the TA. If the TA is measured by the UE, information such as whether LTM has failed can be used to determine whether to obtain the TA in advance or to hand it over to the UE. If the network determines that the UE's own TA measurement is inaccurate, the network will subsequently assist the terminal in measuring the TA. Otherwise, if the network determines that the terminal's TA acquisition is highly accurate, the terminal can trust its own TA measurement.

[0128] Here, the second indication information may include:

[0129] In the case where the terminal measures the TA, the terminal records an indication of whether the TA of the target cell is obtained when receiving the LTM cell switch command sent by the source network device, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between a fourth moment when the terminal obtains the TA of the target cell and a third moment when the LTM cell switch command sent by the source network device is received;

[0130] or,

[0131] If the LTM cell switch command also carries a TA, an indication of whether the difference between the first TA (represented by TA1) carried in the LTM cell switch command recorded by the terminal and the second TA (represented by TA2) measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself or the ratio corresponding to the difference.

[0132] Here, the difference between the first TA (denoted by TA1) carried in the LTM cell switch command and the second TA (denoted by TA2) measured by the terminal itself is represented by TA1-TA2.

[0133] Here, the ratio corresponding to the difference can be expressed as the ratio of the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself to the first TA (represented by TA1), that is, (TA1-TA2) / TA1; or, it can also be expressed as the ratio of the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself to the second TA (represented by TA2), that is, (TA1-TA2) / TA2.

[0134] Here, the ratio may specifically be a percentage, such as 30%.

[0135] Specifically, if the terminal has not obtained the TA of the target cell or has just obtained it when it receives the LTM cell switch command sent by the source network device, it means that the LTM cell switch command is issued too early and should be delayed. Otherwise, the terminal will perform RACH-based LTM cell switching, and the switching delay will be longer; conversely, the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell switch command is received is greater than the third time difference threshold (the time difference is longer), such as exceeding 20ms, it means that the source network device can send the LTM cell switch command to the terminal earlier, otherwise, the TA may become invalid.

[0136] Furthermore, based on an indication of whether the difference between the first TA (represented by TA1) carried in the LTM cell switch command recorded by the terminal and the second TA (represented by TA2) measured by the terminal itself is greater than a preset threshold (a large gap), if the difference between the first TA and the second TA is greater than the preset threshold, the network side determines that the accuracy of the terminal in obtaining the TA is low, and the network side assists the terminal in measuring the TA; otherwise, the network side determines that the accuracy of the terminal in obtaining the TA is high, and the terminal can trust the TA measured by itself.

[0137] Alternatively, the ratio corresponding to the difference, i.e., (TA1-TA2) / TA2 or (TA1-TA2) / TA1, if the ratio corresponding to the difference is greater than a preset ratio threshold such as 30% (a higher ratio), the network side can determine that the accuracy of the UE obtaining the TA is low. If the accuracy is low, the network side will try to assist the terminal in measuring the TA. Otherwise, the TA measured by the terminal itself can be trusted.

[0138] Here, the source network device (such as the source base station) can evaluate whether the timing of sending the LTM cell switch command is appropriate based on the second indication information; and help the network side determine the accuracy of the terminal obtaining the TA to determine whether to assist the terminal in measuring the TA.

[0139] Specifically, the first information can be received by the target network device corresponding to the target cell in which the LTM cell switching is successful. If the first information includes the second indication information, the target network device forwards the second indication information to the source network device, and the source network device evaluates whether the timing of sending the LTM cell switching command is appropriate based on the second indication information; and helps the network side to judge the accuracy of the terminal in obtaining the TA, so as to determine whether to assist the terminal in measuring the TA.

[0140] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the second indication information, the network device corresponding to the first cell forwards the second indication information to the source network device, and the source network device evaluates whether the timing of sending the LTM cell switching command is appropriate based on the second indication information; and helps the network side to judge the accuracy of the terminal in obtaining the TA, so as to determine whether to assist the terminal in measuring the TA.

[0141] As an example, the third indication information may be used to evaluate the time required for LTM cell switching, and help the network side configure the timer duration corresponding to the LTM cell switching.

[0142] Here, the third indication information may include:

[0143] The time difference between the third moment when the terminal receives the LTM cell switch command sent by the source network device and the fifth moment when the terminal successfully executes the LTM cell switch, or the time difference between the third moment when the terminal receives the LTM cell switch command sent by the source network device and the sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or the proportion or percentage of the corresponding timer (such as T304) that has been timing (Running) when the LTM cell switch is successful.

[0144] Here, the terminal successfully performs the LTM cell handover, which may include: the terminal sends an RRC reconfiguration complete (ReconfigurationComplete) message to the target cell, indicating that the terminal successfully performs the LTM cell handover; or, if the terminal performs the RA process, when the random access process is successfully completed, the terminal considers that the LTM cell handover is successfully executed; or, for LTM without RACH, when the UE determines that the network side has successfully received the first uplink (UL) data sent by it, the terminal considers that the LTM cell handover is successfully completed.

[0145] Here, the fifth moment may refer to the moment when the terminal sends an RRC reconfiguration message to the target network device (such as a target base station) after completing the LTM cell handover, and then the target network device sends an indication of successful LTM cell handover to the terminal.

[0146] Here, after the terminal receives the LTM cell switch command sent by the source network device, the terminal starts a timer, and the timer begins timing.

[0147] Specifically, if the time difference between the third moment when the terminal receives the LTM cell switch command sent by the source network device and the fifth moment when the terminal successfully performs the LTM cell switch is greater than the fourth time difference threshold (the time difference is large), it means that the actual switching time is long, and the corresponding timer (such as T304) is configured to be shorter. The corresponding timer should be configured to be longer to avoid the switching failure caused by the expiration of T304; otherwise, it means that the timer is configured too long, and the corresponding timer should be configured to be shorter to avoid the UE waiting for a long time until T304 expires, declaring the switching failure, and entering the cell reconstruction process later, so that the UE can establish a connection with the network as soon as possible; or, the time difference between the third moment when the terminal receives the LTM cell switching command sent by the source network device and the sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal is greater than the fifth time difference threshold (the time difference is large), indicating that the actual switching time is long, and the corresponding timer (such as T304) is configured to be shorter. The corresponding timer should be configured to have a longer duration to avoid handover failure due to expiration of T304; otherwise, it means that the timer is configured too long, and the corresponding timer should be configured to have a shorter duration to avoid the UE waiting for a long time before T304 expires, declaring handover failure, and entering the cell reestablishment process later, so that the UE can establish a connection with the network as soon as possible; or, when the LTM cell handover is successful, the proportion or percentage of the corresponding timer (such as T304) that has been timing (Running) is large, indicating that the actual handover takes a long time, and the corresponding timer (such as T304) is configured to be shorter, which is prone to timeout and cause unnecessary handover failure. The corresponding timer should be configured to have a longer duration to avoid handover failure due to expiration of T304; otherwise, it means that the timer is configured too long, and the corresponding timer should be configured to have a shorter duration to avoid the UE waiting for a long time before T304 expires, declaring handover failure, and entering the cell reestablishment process later, so that the UE can establish a connection with the network as soon as possible.

[0148] Here, the source network device (such as the source base station) may evaluate the time required for the LTM cell handover according to the third indication information to help the network side configure the timer duration corresponding to the LTM cell handover.

[0149] Specifically, the first information can be received by the target network device corresponding to the target cell in which the LTM cell switching is successful. If the first information contains the third indication information, the target network device forwards the third indication information to the source network device, and the source network device evaluates the time required for the LTM cell switching based on the third indication information, to help the network side configure the timer duration corresponding to the LTM cell switching.

[0150] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the third indication information, the network device corresponding to the first cell forwards the third indication information to the source network device, and the source network device evaluates the time required for the LTM cell switching based on the third indication information to help the network side configure the timer duration corresponding to the LTM cell switching.

[0151] As an example, the fourth indication information may be used to help the network side select a suitable target cell for LTM cell handover for the terminal.

[0152] Specifically, the fourth indication information may include:

[0153] An indication of whether the cell selected by the terminal during cell selection after an LTM cell handover fails is an LTM candidate cell, or a cell identifier of the LTM candidate cell selected by the terminal during cell selection after an LTM cell handover fails.

[0154] The cell identifier of the selected LTM candidate cell may refer to a physical cell identifier (PCI, Physical Cell ID) or an identifier corresponding to a candidate cell configured for LTM cell handover.

[0155] Here, the identifier of the selected LTM candidate cell can assist the source network device (such as the source base station) in selecting a suitable handover target cell.

[0156] Specifically, since the target cell handover of the current LTM cell handover fails, if the cell selected by the terminal during cell selection is another LTM candidate cell, the selected LTM candidate cell is the appropriate handover target cell.

[0157] Here, the source network device (such as the source base station) may select a suitable target cell for LTM cell handover for the terminal according to the fourth indication information.

[0158] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information contains the fourth indication information, the target network device forwards the fourth indication information to the source network device, and the source network device selects a suitable target cell for LTM cell switching for the terminal based on the fourth indication information.

[0159] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the fourth indication information, the network device corresponding to the first cell forwards the fourth indication information to the source network device, and the source network device selects a suitable target cell for LTM cell switching for the terminal based on the fourth indication information.

[0160] As an example, the fifth indication information may be used to help the network side configure a target cell for LTM cell handover.

[0161] Here, the fifth indication information may include:

[0162] The identifier of the cell from which the terminal has never performed LTM cell handover among the configured LTM candidate cells.

[0163] Specifically, the identifiers corresponding to cells from which the terminal has never performed LTM cell handover can help the network side not to subsequently configure these cells as target cells for LTM cell handover.

[0164] Here, the source network device (such as the source base station) may configure the target cell for LTM cell handover for the terminal according to the fifth indication information.

[0165] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information contains the fifth indication information, the target network device forwards the fifth indication information to the source network device, and the source network device configures the target cell for the LTM cell switching for the terminal according to the fifth indication information.

[0166] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the fifth indication information, the network device corresponding to the first cell forwards the fifth indication information to the source network device, and the source network device configures the target cell for the LTM cell switching for the terminal according to the fifth indication information.

[0167] As an example, the sixth indication information may be used to help the network side determine a timing for configuring a target cell for LTM cell switching.

[0168] Here, the sixth indication information may include:

[0169] The time difference between the seventh moment of receiving the RRC signaling sent by the source network device and the eighth moment of switching to the LTM candidate cell or target configuration of the terminal; the RRC signaling carries the relevant configuration of LTM; or the time difference between the third moment of receiving the LTM cell handover command and the ninth moment of switching to the target configuration of the terminal; wherein the target configuration may refer to the relevant configuration of the target cell;

[0170] Specifically, if the time difference from receiving the RRC configuration about LTM to the terminal switching to the LTM candidate cell or target configuration is greater than the sixth time difference threshold (the time difference is very long), or the time difference from the third moment of receiving the LTM cell switching command to the ninth moment when the terminal switches to the target configuration is greater than the seventh time difference threshold (the time difference is very long), it means that the target cell is configured too early, causing the target cell to prepare the C-RNTI, random access resources, etc. for the terminal to switch over too early, resulting in resource waste. The network side should configure these candidate target cells later.

[0171] Here, the source network device (such as the source base station) may determine the timing of configuring the target cell for LTM cell handover according to the sixth indication information.

[0172] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information includes the sixth indication information, the target network device forwards the sixth indication information to the source network device, and the source network device determines the timing of configuring the target cell for LTM cell switching based on the sixth indication information.

[0173] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the sixth indication information, the network device corresponding to the first cell forwards the sixth indication information to the source network device, and the source network device determines the timing of configuring the target cell for LTM cell switching based on the sixth indication information.

[0174] Here, the seventh indication information may include:

[0175] Whether non-contention RA resources are configured in the LTM cell switch command, and / or related information of the non-contention RA resources.

[0176] The relevant information on non-competitive RA resources includes one or more of the following:

[0177] Whether the carrier where the non-contention RA resource is located is SUL or NUL (occupies 1 bit);

[0178] Random Access Preamble index (6 bits);

[0179] Synchronization signal index or physical broadcast channel index (SS / PBCH index) (occupies 6 bits, used to determine the random access occasion (RACH occasion));

[0180] Physical random access channel mask index (PRACH Mask index) (occupies 4 bits, used to indicate the RACH occasion(s) associated with the SS / PBCH index).

[0181] Specifically, if a collision of random access preambles occurs during the UE's LTM process, resulting in a longer LTM delay, non-contention RA resources should be configured for the terminal. That is, the cell handover command needs to include the configured non-contention RA resources. If non-contention RA resources have been configured for the UE, the network side can determine whether subsequent RA resources can be optimized based on the time required for random access or LTM handover, such as sharing with other terminals switching at different time periods or avoiding collisions with other terminals' RA resources. Alternatively, if the time required for random access or LTM handover is long, indicating frequent collisions, non-contention RA resources need to be distributed to multiple points.

[0182] Here, the target network device (such as the target base station) may evaluate whether non-contention RA resources should be configured for the UE and whether the configured RA resources are reasonable according to the seventh indication information.

[0183] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell is successfully switched. If the first information includes the seventh indication information, the target network device evaluates whether non-competitive RA resources should be configured for the terminal and whether the configured RA resources are reasonable based on the seventh indication information.

[0184] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal is successfully connected after the LTM cell switching fails. If the first information includes the seventh indication information, the network device corresponding to the first cell forwards the seventh indication information to the candidate target network device, and the candidate target network device evaluates whether non-competitive RA resources should be configured for the terminal and whether the configured RA resources are reasonable based on the seventh indication information.

[0185] In some embodiments, the method further comprises:

[0186] When the LTM cell handover meets the LTM cell handover success condition, the first information is recorded.

[0187] Here, for the LTM cell handover success scenario, when the LTM cell handover success condition is met, the terminal records the first information.

[0188] The LTM cell handover success condition may be satisfied when the ratio of the running time of the timer (e.g., T304) corresponding to the LTM cell handover to the timer duration exceeds a certain ratio. After receiving the LTM cell handover command, the terminal starts the timer corresponding to the LTM cell handover, and the timer begins counting.

[0189] For example, assuming that the ratio of the duration of the timer corresponding to the LTM cell switching to the timer duration is greater than 80%, it means that there is a certain risk of successful LTM cell switching, and the terminal records the first information; otherwise, the LTM cell switching is successful and very stable, and the terminal does not need to record relevant information to help the network side optimize.

[0190] In some embodiments, the method further comprises:

[0191] Under the LTM cell switching configuration of the network device, the first information is recorded.

[0192] Here, the terminal may record and report the first information under the LTM cell handover configuration of a network device (such as a transmission control element (TCE) or a base station).

[0193] In some embodiments, the method further comprises:

[0194] After the terminal fails to perform LTM cell handover, if the terminal performs cell selection but fails to select an LTM candidate cell, the first information is recorded in the cell reconstruction process.

[0195] Here, the LTM candidate cell may refer to a cell among multiple LTM candidate cells configured by the source network device for the terminal during LTM cell handover.

[0196] Here, in order to save the signaling overhead of the terminal recording and reporting, the terminal may perform cell selection after LTM fails and if no LTM candidate cell is selected, then record and report the first information in the cell reconstruction process.

[0197] In some embodiments, sending the first information to the network device includes:

[0198] The first information is sent to the network device during the process of the terminal entering the connected state or after the terminal enters the connected state.

[0199] In some embodiments, sending the first information to the network device during or after the terminal enters the connected state includes:

[0200] When the terminal successfully performs LTM cell switching, if the target cell to which the LTM cell switching is successful sends a first request to the terminal, the first information is sent to the network device corresponding to the target cell to which the LTM cell switching is successful; the first request is used to request the terminal to report information related to the execution of LTM cell switching.

[0201] Here, in the case where the LTM cell handover is successful, if the target cell requests the terminal for information related to the success or failure of the LTM cell handover, the terminal reports the first information to the target cell where the LTM cell handover is successful.

[0202] In some embodiments, sending the first information to the network device during or after the terminal enters the connected state includes:

[0203] In the event that the terminal fails to perform LTM cell switching, if the first cell to which the terminal is successfully connected sends a second request to the terminal, the first information is sent to the network device corresponding to the first cell; wherein the second request is used to request the terminal to report information related to the success or failure of performing LTM cell switching, and the network device corresponding to the first cell forwards the first information to the source network device or the target network device.

[0204] Here, the first cell to which the terminal successfully connects may refer to a cell selected based on cell signal quality. Specifically, it may include a cell to which the terminal connects when LTM cell handover is successfully performed, or a cell among multiple LTM candidate cells configured by the source network device for the terminal, or a cell other than the multiple LTM candidate cells configured by the source network device for the terminal.

[0205] Here, in the case of an LTM cell handover failure, when the first cell to which the terminal is successfully connected requests information related to the success or failure of the LTM cell handover from the terminal, the terminal reports the first information to the network device corresponding to the first cell. When the network device of the first cell where the LTM cell handover success or failure is located, which receives the information related to the success or failure of the LTM cell handover, determines that the first information needs to be forwarded to the source network device or a candidate target network device, it forwards the first information to the source network device or the candidate target network device.

[0206] Specifically, if the terminal reporting content contains the first indication information and / or the seventh indication information, the receiving network device determines that the network side device that needs to be optimized is the target network device (such as the target base station), and it will forward it to the target network device; if the terminal reporting content contains at least one of the second indication information, the third indication information, the fourth indication information, the fifth indication information and the sixth indication information, the receiving network device determines that the network side device that needs to be optimized is the source network device (such as the source base station), and it will forward it to the source network device.

[0207] In the embodiment of the present application, the following advantages are possessed:

[0208] (1) The terminal reports relevant information about the success or failure of LTM cell handover to the network device, which can help the network side optimize the LTM cell handover related timers, LTM candidate cell configuration, etc., thereby improving the LTM handover performance. It can avoid the problems in related technologies such as the inability to successfully establish an RRC connection with the target cell in some cases, or the occurrence of radio link failure in the target cell soon after the RRC connection is established due to premature handover.

[0209] 2 is a schematic diagram of an implementation flow of an information transmission method according to an embodiment of the present application, which is applied to a network device. As shown in FIG2 , the method includes step 201:

[0210] Step 201: Receive first information sent by a terminal; the first information represents relevant information of the terminal performing LTM cell handover.

[0211] As an example, the first information may represent relevant information of whether the terminal successfully or failed to perform LTM cell handover.

[0212] In the embodiment of the present application, the LTM cell switching can also be described as L1 / L2-based cell switching, or LTM switching, or cell switching, etc., all of which express the same meaning.

[0213] As an example, the terminal can record and report relevant information on the failure or success of the terminal in performing LTM cell switching, helping the network side to optimize LTM cell switching related timers, LTM candidate cell configuration, etc., to improve LTM cell switching performance.

[0214] In some embodiments, the first information includes one or more of the following:

[0215] First instruction information;

[0216] Second instruction information;

[0217] Third instruction information;

[0218] Fourth instruction information;

[0219] Fifth instruction information;

[0220] Sixth instruction information;

[0221] Seventh instruction information;

[0222] in,

[0223] The first indication information represents the number of times the terminal receives a PDCCH instruction, where the PDCCH instruction is used to instruct the terminal to obtain the TA of the target cell in advance, or the time difference between a first moment when the terminal first receives the PDCCH instruction and a third moment when the terminal receives the LTM cell handover command, or the time difference between a second moment when the terminal sends a random access preamble and a third moment when the terminal receives the LTM cell handover command;

[0224] The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference;

[0225] The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover;

[0226] The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails;

[0227] The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover;

[0228] The sixth indication information represents a time difference between a seventh moment of receiving the RRC signaling and an eighth moment of switching the terminal to the LTM candidate cell or the target configuration; the RRC signaling carries the configuration of the LTM candidate cell; or a time difference between a third moment of receiving the LTM cell handover command and a ninth moment of switching the terminal to the target configuration;

[0229] The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive RA resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is SUL or NUL; random access preamble code index; synchronization signal index or PBCH index; PRACH mask index.

[0230] In some embodiments, the method further comprises:

[0231] Do at least one of the following:

[0232] Based on the first indication information, configure a random access preamble corresponding to a target cell for LTM cell handover;

[0233] Determining, based on the second indication information, a timing for sending an LTM cell handover command, and determining whether to assist the terminal in measuring a TA;

[0234] Based on the third indication information, configure the timer duration corresponding to the LTM cell handover;

[0235] Selecting a target cell for LTM cell handover for the terminal based on the fourth indication information;

[0236] Based on the fifth indication information, configure a target cell for LTM cell handover;

[0237] Determining, based on the sixth indication information, a timing for configuring a target cell for LTM cell handover;

[0238] Based on the seventh indication information, it is determined whether to configure non-contention RA resources for the terminal, and whether the configured RA resources are reasonable when the non-contention RA resources are configured.

[0239] Here, the network device performs corresponding configuration optimization according to the first information reported by the terminal.

[0240] As an example, the first indication information may be used to evaluate the congestion of the random access preamble of the target cell, and to help the network side optimize the configuration of the random access preamble corresponding to the target cell of the LTM cell handover.

[0241] Here, the first indication information may include:

[0242] In the case where the network assists the terminal in measuring the TA, the terminal records the number of times it receives the PDCCH instruction (order) sent by the source network device on the network side, where the PDCCH instruction is used to instruct the terminal to obtain the TA of the target cell in advance, or the time difference between the first moment when the terminal first receives the PDCCH instruction (order) sent by the source network device and the third moment when the terminal receives the LTM cell switch command sent by the source network device, or the time difference between the second moment when the terminal sends the random access preamble (preamble) to the target network device and the third moment when the terminal receives the LTM cell switch command sent by the source network device.

[0243] Here, the terminal receives a PDCCH instruction sent by the source network device before receiving the LTM cell switching command.

[0244] Here, the LTM cell switching command may refer to a cell switching command sent by a source network device and received by the terminal during the LTM cell switching process, where the cell switching command is used to instruct the terminal to perform LTM cell switching.

[0245] Here, if the terminal is supported to obtain the TA in advance, the terminal reports the time difference between the first moment of receiving the PDCCH instruction (order) sent by the source network device and the third moment of receiving the LTM cell switching (cell switch) command sent by the source network device; if the terminal is not supported to obtain the TA in advance, the terminal reports the time difference between the third moment of receiving the LTM cell switching (cell switch) command sent by the source network device and the first moment of receiving the PDCCH instruction (order) sent by the source network device for the first time.

[0246] Specifically, if the number of times the terminal receives the PDCCH order sent by the source network device (such as the source base station) is greater than the number threshold (the number is large), such as more than 5 times, or the time difference between the first moment of receiving the PDCCH order for the first time and the third moment of receiving the LTM cell switch command sent by the source network device is greater than the first time difference threshold (the time difference is long), such as more than 20ms, or the time difference between the second moment when the terminal sends the random access preamble to the target network device and the third moment when the LTM cell switch command is received is greater than the second time difference threshold (the time difference is long), such as more than 20ms, then it means that the random access preamble of the target cell has more collisions, that is, multiple terminals use the same random access code to access the target cell at the same time. Therefore, more random access preambles need to be configured for the target cell.

[0247] Here, the target network device (such as the target base station) may optimize and configure the random access preamble corresponding to the target cell of the LTM cell handover according to the first indication information.

[0248] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information includes the first indication information, the target network device optimizes and configures the random access preamble corresponding to the target cell to which the LTM cell switching is successfully performed according to the first indication information.

[0249] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the first indication information, the network device corresponding to the first cell forwards the first indication information to the candidate target network device, and the candidate target network device optimizes and configures the random access preamble corresponding to the target cell of the LTM cell switching according to the first indication information.

[0250] As an example, the second indication information may be used to evaluate whether the timing of sending the LTM cell switch command is appropriate; and to help the network side determine the accuracy of the terminal acquiring the TA so as to determine whether to assist the terminal in measuring the TA.

[0251] Here, the second indication information may include:

[0252] In the case where the terminal measures the TA, the terminal records an indication of whether the TA of the target cell is obtained when receiving the LTM cell switch command sent by the source network device, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between a fourth moment at which the terminal obtains the TA of the target cell and a third moment at which the LTM cell switch command sent by the source network device is received;

[0253] or,

[0254] If the LTM cell switch command also carries a TA, an indication of whether the difference between the first TA (represented by TA1) carried in the LTM cell switch command recorded by the terminal and the second TA (represented by TA2) measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself or the ratio corresponding to the difference.

[0255] Here, the difference between the first TA (denoted by TA1) carried in the LTM cell switch command and the second TA (denoted by TA2) measured by the terminal itself can be expressed as TA1-TA2.

[0256] Here, the ratio corresponding to the difference can be expressed as the ratio of the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself to the first TA (represented by TA1), that is, (TA1-TA2) / TA1; or, it can also be expressed as the ratio of the difference between the first TA (represented by TA1) carried in the LTM cell switch command and the second TA (represented by TA2) measured by the terminal itself to the second TA (represented by TA2), that is, (TA1-TA2) / TA2.

[0257] Here, the ratio may specifically be a percentage, such as 30%.

[0258] Specifically, if the terminal has not obtained the TA of the target cell or has just obtained it when it receives the LTM cell switch command sent by the source network device, it means that the LTM cell switch command is issued too early and should be delayed. Otherwise, the terminal will perform RACH-based LTM cell switching, and the switching delay will be longer; conversely, the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell switch command is received is greater than the third time difference threshold (the time difference is longer), such as exceeding 20ms, it means that the source network device can send the LTM cell switch command to the terminal earlier, otherwise, the TA may become invalid.

[0259] Furthermore, based on an indication of whether the difference between the first TA (represented by TA1) carried in the LTM cell switch command recorded by the terminal and the second TA (represented by TA2) measured by the terminal itself is greater than a preset threshold (a large gap), if the difference between the first TA and the second TA is greater than the preset threshold, the network side determines that the accuracy of the terminal in obtaining the TA is low, and the network side assists the terminal in measuring the TA; otherwise, the network side determines that the accuracy of the terminal in obtaining the TA is high, and the terminal can trust the TA measured by itself.

[0260] Alternatively, the ratio corresponding to the difference, i.e., (TA1-TA2) / TA2 or (TA1-TA2) / TA1, if the ratio corresponding to the difference exceeds a preset ratio threshold such as 30% (a higher ratio), the network side may determine that the accuracy of the UE obtaining the TA is low. If the accuracy is low, the network side will try to assist the terminal in measuring the TA. Otherwise, the TA measured by the terminal itself may be trusted.

[0261] Here, the source network device (such as the source base station) can evaluate whether the timing of sending the LTM cell switch command is appropriate based on the second indication information; and help the network side determine the accuracy of the terminal obtaining the TA to determine whether to assist the terminal in measuring the TA.

[0262] Specifically, the first information can be received by the target network device corresponding to the target cell in which the LTM cell switching is successful. If the first information includes the second indication information, the target network device forwards the second indication information to the source network device, and the source network device evaluates whether the timing of sending the LTM cell switching command is appropriate based on the second indication information; and helps the network side to judge the accuracy of the terminal in obtaining the TA, so as to determine whether to assist the terminal in measuring the TA.

[0263] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the second indication information, the network device corresponding to the first cell forwards the second indication information to the source network device, and the source network device evaluates whether the timing of sending the LTM cell switching command is appropriate based on the second indication information; and helps the network side to judge the accuracy of the terminal in obtaining the TA, so as to determine whether to assist the terminal in measuring the TA.

[0264] As an example, the third indication information may be used to evaluate the time required for LTM cell switching, and help the network side configure the timer duration corresponding to the LTM cell switching.

[0265] Here, the third indication information may include:

[0266] The time difference between the third moment when the terminal receives the LTM cell switch command sent by the source network device and the fifth moment when the terminal successfully executes the LTM cell switch, or the time difference between the third moment when the terminal receives the LTM cell switch command sent by the source network device and the sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or the proportion or percentage of the corresponding timer (such as T304) that has been timing (Running) when the LTM cell switch is successful.

[0267] Here, the terminal successfully performs the LTM cell handover, which may include: the terminal sends an RRC reconfiguration complete (ReconfigurationComplete) message to the target cell, indicating that the terminal successfully performs the LTM cell handover; or, if the terminal performs the RA process, when the random access process is successfully completed, the terminal considers that the LTM cell handover is successfully executed; or, for LTM without RACH, when the UE determines that the network side has successfully received the first uplink (UL) data sent by it, the terminal considers that the LTM cell handover is successfully completed.

[0268] Here, the fifth moment may refer to the moment when the terminal sends an RRC reconfiguration message to the target network device (such as a target base station) after completing the LTM cell handover, and then the target network device sends an indication of successful LTM cell handover to the terminal.

[0269] Here, after the terminal receives the LTM cell switch command sent by the source network device, the terminal starts a timer, and the timer begins timing.

[0270] Specifically, if the time difference between the third moment when the terminal receives the LTM cell switch command sent by the source network device and the fifth moment when the terminal successfully performs the LTM cell switch is greater than the fourth time difference threshold (the time difference is large), it means that the actual switching time is long, and the corresponding timer (such as T304) is configured to be shorter. The corresponding timer should be configured to be longer to avoid the switching failure caused by the expiration of T304; otherwise, it means that the timer is configured too long, and the corresponding timer should be configured to be shorter to avoid the UE waiting for a long time until T304 expires, declaring the switching failure, and entering the cell reconstruction process later, so that the UE can establish a connection with the network as soon as possible; or, the time difference between the third moment when the terminal receives the LTM cell switching command sent by the source network device and the sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal is greater than the fifth time difference threshold (the time difference is large), indicating that the actual switching time is long, and the corresponding timer (such as T304) is configured to be shorter. The corresponding timer should be configured to have a longer duration to avoid handover failure due to expiration of T304; otherwise, it means that the timer is configured too long, and the corresponding timer should be configured to have a shorter duration to avoid the UE waiting for a long time before T304 expires, declaring handover failure, and entering the cell reestablishment process later, so that the UE can establish a connection with the network as soon as possible; or, when the LTM cell handover is successful, the proportion or percentage of the corresponding timer (such as T304) that has been timing (Running) is large, indicating that the actual handover takes a long time, and the corresponding timer (such as T304) is configured to be shorter, which is prone to timeout and cause unnecessary handover failure. The corresponding timer should be configured to have a longer duration to avoid handover failure due to expiration of T304; otherwise, it means that the timer is configured too long, and the corresponding timer should be configured to have a shorter duration to avoid the UE waiting for a long time before T304 expires, declaring handover failure, and entering the cell reestablishment process later, so that the UE can establish a connection with the network as soon as possible.

[0271] Here, the source network device (such as the source base station) may evaluate the time required for the LTM cell handover according to the third indication information to help the network side configure the timer duration corresponding to the LTM cell handover.

[0272] Specifically, the first information can be received by the target network device corresponding to the target cell in which the LTM cell switching is successful. If the first information contains the third indication information, the target network device forwards the third indication information to the source network device, and the source network device evaluates the time required for the LTM cell switching based on the third indication information, to help the network side configure the timer duration corresponding to the LTM cell switching.

[0273] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the third indication information, the network device corresponding to the first cell forwards the third indication information to the source network device, and the source network device evaluates the time required for the LTM cell switching based on the third indication information to help the network side configure the timer duration corresponding to the LTM cell switching.

[0274] As an example, the fourth indication information may be used to help the network side select a suitable target cell for LTM cell handover for the terminal.

[0275] Specifically, the fourth indication information may include:

[0276] An indication of whether the cell selected by the terminal during cell selection after an LTM cell handover fails is an LTM candidate cell, or a cell identifier of the LTM candidate cell selected by the terminal during cell selection after an LTM cell handover fails.

[0277] The cell identifier of the selected LTM candidate cell may refer to a physical cell identifier (PCI, Physical Cell ID) or an identifier of a candidate cell for LTM cell handover configuration.

[0278] Here, the identifier of the selected LTM candidate cell can assist the source network device (such as the source base station) in selecting a suitable handover target cell.

[0279] Specifically, since the target cell handover of the current LTM cell handover fails, if the cell selected by the terminal during cell selection is another LTM candidate cell, the selected LTM candidate cell is the appropriate handover target cell.

[0280] Here, the source network device (such as the source base station) may select a suitable target cell for LTM cell handover for the terminal according to the fourth indication information.

[0281] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information contains the fourth indication information, the target network device forwards the fourth indication information to the source network device, and the source network device selects a suitable target cell for LTM cell switching for the terminal based on the fourth indication information.

[0282] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the fourth indication information, the network device corresponding to the first cell forwards the fourth indication information to the source network device, and the source network device selects a suitable target cell for LTM cell switching for the terminal based on the fourth indication information.

[0283] As an example, the fifth indication information may be used to help the network side configure a target cell for LTM cell handover.

[0284] Here, the fifth indication information may include:

[0285] The identifier of the cell from which the terminal has never performed LTM cell handover among the configured LTM candidate cells.

[0286] Specifically, the identifiers corresponding to cells from which the terminal has never performed LTM cell handover can help the network side not to subsequently configure these cells as target cells for LTM cell handover.

[0287] Here, the source network device (such as the source base station) may configure the target cell for LTM cell handover for the terminal according to the fifth indication information.

[0288] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information contains the fifth indication information, the target network device forwards the fifth indication information to the source network device, and the source network device configures the target cell for the LTM cell switching for the terminal according to the fifth indication information.

[0289] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the fifth indication information, the network device corresponding to the first cell forwards the fifth indication information to the source network device, and the source network device configures the target cell for the LTM cell switching for the terminal according to the fifth indication information.

[0290] As an example, the sixth indication information may be used to help the network side determine a timing for configuring a target cell for LTM cell switching.

[0291] Here, the sixth indication information may include:

[0292] The time difference between the seventh moment of receiving the RRC signaling sent by the source network device and the eighth moment of switching to the LTM candidate cell or target configuration of the terminal; the RRC signaling carries the relevant configuration of LTM; or the time difference between the third moment of receiving the LTM cell handover command and the ninth moment of switching to the target configuration of the terminal; wherein the target configuration may refer to the relevant configuration of the target cell;

[0293] Specifically, if the time difference from receiving the RRC configuration about LTM to the terminal switching to the LTM candidate cell or target configuration is greater than the sixth time difference threshold (the time difference is very long), or the time difference from the third moment of receiving the LTM cell switching command to the ninth moment when the terminal switches to the target configuration is greater than the seventh time difference threshold (the time difference is very long), it means that the target cell is configured too early, causing the target cell to prepare the C-RNTI, random access resources, etc. for the terminal to switch over too early, resulting in resource waste. The network side should configure these candidate target cells later.

[0294] Here, the source network device (such as the source base station) may determine the timing of configuring the target cell for LTM cell handover according to the sixth indication information.

[0295] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell switching is successful. If the first information includes the sixth indication information, the target network device forwards the sixth indication information to the source network device, and the source network device determines the timing of configuring the target cell for LTM cell switching based on the sixth indication information.

[0296] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal successfully connects after the LTM cell switching fails. If the first information includes the sixth indication information, the network device corresponding to the first cell forwards the sixth indication information to the source network device, and the source network device determines the timing of configuring the target cell for LTM cell switching based on the sixth indication information.

[0297] Here, the seventh indication information may include:

[0298] Whether non-contention RA resources are configured in the LTM cell switch command, and / or related information of the non-contention RA resources.

[0299] The relevant information on non-competitive RA resources includes one or more of the following:

[0300] Whether the carrier where the non-contention RA resource is located is SUL or NUL (occupies 1 bit);

[0301] Random Access Preamble index (6 bits);

[0302] Synchronization signal index or physical broadcast channel index (SS / PBCH) index (occupies 6 bits, used to determine the random access occasion (RACH occasion));

[0303] Physical random access channel mask index (PRACH Mask index) (occupies 4 bits, used to indicate the RACH occasion(s) associated with the SS / PBCH index).

[0304] Specifically, if a collision of random access preambles occurs during the UE's LTM process, resulting in a longer LTM delay, non-contention RA resources should be configured for the terminal. That is, the cell handover command needs to include the configured non-contention RA resources. If non-contention RA resources have been configured for the UE, the network side can determine whether subsequent RA resources can be optimized based on the time required for random access or LTM handover, such as sharing with other terminals switching at different time periods or avoiding collisions with other terminals' RA resources. Alternatively, if the time required for random access or LTM handover is long, indicating frequent collisions, non-contention RA resources need to be distributed to multiple points.

[0305] Here, the target network device (such as the target base station) may evaluate whether non-contention RA resources should be configured for the UE and whether the configured RA resources are reasonable according to the seventh indication information.

[0306] Specifically, the first information can be received by the target network device corresponding to the target cell to which the LTM cell is successfully switched. If the first information includes the seventh indication information, the target network device evaluates whether non-competitive RA resources should be configured for the terminal and whether the configured RA resources are reasonable based on the seventh indication information.

[0307] Alternatively, the first information is received by the network device corresponding to the first cell to which the terminal is successfully connected after the LTM cell switching fails. If the first information includes the seventh indication information, the network device corresponding to the first cell forwards the seventh indication information to the candidate target network device, and the candidate target network device evaluates whether non-competitive RA resources should be configured for the terminal and whether the configured RA resources are reasonable based on the seventh indication information.

[0308] In some embodiments, the first information sent by the receiving terminal includes:

[0309] The first information sent by the terminal is received during the process of the terminal entering the connected state or after the terminal enters the connected state.

[0310] In some embodiments, the network device is a network device corresponding to a target cell in which the LTM cell handover is successful; and receiving the first information sent by the terminal during or after the terminal enters the connected state includes:

[0311] When the terminal successfully performs LTM cell switching, a first request is sent to the terminal, and the first information sent by the terminal is received; the first request is used to request the terminal to report information related to performing LTM cell switching.

[0312] Here, in the case where the LTM cell handover is successful, if the target cell requests the terminal for information related to the success or failure of the LTM cell handover, the terminal reports the first information to the target cell where the LTM cell handover is successful.

[0313] In some embodiments, the network device is a network device corresponding to the first cell; and the receiving, during or after the terminal enters the connected state, the first information sent by the terminal includes:

[0314] In the event that the terminal fails to perform LTM cell switching, a second request is sent to the terminal, the first information sent by the terminal is received, and the first information is forwarded to the source network device or the target network device; wherein the second request is used to request the terminal to report information related to performing LTM cell switching.

[0315] Here, the first cell to which the terminal successfully connects may refer to a cell selected based on cell signal quality. Specifically, it may include a cell to which the terminal is connected when LTM cell handover is successfully performed, or a cell among multiple candidate target cells configured by the source network device for the terminal, or a cell other than the multiple candidate target cells configured by the source network device for the terminal.

[0316] Here, in the case of an LTM cell handover failure, when the first cell to which the terminal is successfully connected requests information related to the success or failure of the LTM cell handover from the terminal, the terminal reports the first information to the network device corresponding to the first cell. When the network device of the first cell where the LTM cell handover success or failure is located, which receives the information related to the success or failure of the LTM cell handover, determines that the first information needs to be forwarded to the source network device or a candidate target network device, it forwards the first information to the source network device or the candidate target network device.

[0317] Specifically, if the terminal reporting content contains the first indication information and / or the seventh indication information, the receiving network device determines that the network side device that needs to be optimized is the target network device (such as the target base station), and it will forward it to the target network device; if the terminal reporting content contains at least one of the second indication information, the third indication information, the fourth indication information, the fifth indication information and the sixth indication information, the receiving network device determines that the network side device that needs to be optimized is the source network device (such as the source base station), and it will forward it to the source network device.

[0318] In the embodiment of the present application, the following advantages are possessed:

[0319] (1) The terminal reports relevant information about the success or failure of LTM cell handover to the network device, which can help the network side optimize the LTM cell handover related timers, LTM candidate cell configuration, etc., thereby improving the LTM handover performance. It can avoid the problems in related technologies such as the inability to successfully establish an RRC connection with the target cell in some cases, or the occurrence of radio link failure in the target cell soon after the RRC connection is established due to premature handover.

[0320] To implement the information transmission method of the embodiment of the present application, the embodiment of the present application also provides an information transmission device, which is provided in a terminal. FIG3 is a schematic diagram of the composition structure of the information transmission device of the embodiment of the present application. As shown in FIG3, the device includes:

[0321] The sending module 31 is configured to send first information to a network device; the first information represents relevant information of the terminal performing LTM cell handover.

[0322] In some embodiments, the first information includes one or more of the following:

[0323] First instruction information;

[0324] Second instruction information;

[0325] Third instruction information;

[0326] Fourth instruction information;

[0327] Fifth instruction information;

[0328] Sixth instruction information;

[0329] Seventh instruction information;

[0330] in,

[0331] The first indication information represents the number of times the terminal receives a physical downlink control channel (PDCCH) instruction, where the PDCCH instruction is used to instruct the terminal to obtain a timing advance (TA) of a target cell in advance, or a time difference between a first time when the terminal first receives the PDCCH instruction and a third time when the terminal receives an LTM cell handover command, or a time difference between a second time when the terminal sends a random access preamble and a third time when the terminal receives the LTM cell handover command;

[0332] The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference;

[0333] The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover;

[0334] The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails;

[0335] The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover;

[0336] The sixth indication information represents a time difference between a seventh moment of receiving RRC signaling and an eighth moment of switching the terminal to the LTM candidate cell or target configuration; the RRC signaling carries the relevant configuration of LTM; or a time difference between a third moment of receiving the LTM cell handover command and a ninth moment of switching the terminal to the target configuration;

[0337] The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive random access (RA) resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is a secondary uplink carrier (SUL) or a normal uplink carrier (NUL); a random access preamble code index; a synchronization signal index or a physical broadcast channel (SS / PBCH) index; and a physical random access channel (PRACH) mask index.

[0338] In some embodiments, the device is further configured to:

[0339] When the LTM cell handover meets the LTM cell handover success condition, the first information is recorded.

[0340] In some embodiments, the device is further configured to:

[0341] Under the LTM cell switching configuration of the network device, the first information is recorded.

[0342] In some embodiments, the device is further configured to:

[0343] After the terminal fails to perform LTM cell handover, if the terminal performs cell selection but fails to select an LTM candidate cell, the first information is recorded in the cell reconstruction process.

[0344] In some embodiments, the sending module 31 is further configured to:

[0345] The first information is sent to the network device during the process of the terminal entering the connected state or after the terminal enters the connected state.

[0346] In some embodiments, the sending module 31 is further configured to:

[0347] When the terminal successfully performs LTM cell switching, if the target cell to which the LTM cell switching is successful sends a first request to the terminal, the first information is sent to the network device corresponding to the target cell to which the LTM cell switching is successful; the first request is used to request the terminal to report information related to the execution of LTM cell switching.

[0348] In some embodiments, the sending module 31 is further configured to:

[0349] In the event that the terminal fails to perform LTM cell switching, if the first cell to which the terminal is successfully connected sends a second request to the terminal, the first information is sent to the network device corresponding to the first cell; wherein the second request is used to request the terminal to report information related to the success or failure of performing LTM cell switching, and the network device corresponding to the first cell forwards the first information to the source network device or the target network device.

[0350] In actual application, the sending module 31 can be implemented by a communication interface in an information transmission device.

[0351] It should be noted that the information transmission device provided in the above embodiments is illustrated only by the division of the aforementioned program modules when performing information transmission. In actual applications, the aforementioned processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the aforementioned processing. In addition, the information transmission device provided in the above embodiments and the information transmission method embodiment are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0352] To implement the information transmission method of the embodiment of the present application, the embodiment of the present application also provides an information transmission device, which is set on a network device. Figure 4 is a schematic diagram of the composition structure of the information transmission device of the embodiment of the present application. As shown in Figure 4, the device includes:

[0353] The receiving module 41 is configured to receive first information sent by a terminal; the first information represents relevant information of the terminal performing LTM cell handover.

[0354] In some embodiments, the first information includes one or more of the following:

[0355] First instruction information;

[0356] Second instruction information;

[0357] Third instruction information;

[0358] Fourth instruction information;

[0359] Fifth instruction information;

[0360] Sixth instruction information;

[0361] Seventh instruction information;

[0362] in,

[0363] The first indication information represents the number of times the terminal receives a PDCCH instruction, where the PDCCH instruction is used to instruct the terminal to obtain the TA of the target cell in advance, or the time difference between a first moment when the terminal first receives the PDCCH instruction and a third moment when the terminal receives the LTM cell handover command, or the time difference between a second moment when the terminal sends a random access preamble and a third moment when the terminal receives the LTM cell handover command;

[0364] The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTTM cell handover command is received, or an indication of whether the difference between the first TA carried by the cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference;

[0365] The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data, or a proportion or percentage of the timer corresponding to the successful LTM cell handover;

[0366] The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails;

[0367] The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover;

[0368] The sixth indication information represents a time difference between a seventh moment of receiving the RRC signaling and an eighth moment of switching the terminal to the LTM candidate cell or the target configuration; the RRC signaling carries the configuration of the LTM candidate cell; or a time difference between a third moment of receiving the LTM cell handover command and a ninth moment of switching the terminal to the target configuration;

[0369] The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive RA resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is SUL or NUL; random access preamble code index; synchronization signal index or PBCH index; PRACH mask index.

[0370] In some embodiments, the device is further configured to:

[0371] Do at least one of the following:

[0372] Based on the first indication information, configure a random access preamble corresponding to a target cell for LTM cell handover;

[0373] Determining, based on the second indication information, a timing for sending an LTM cell handover command, and determining whether to assist the terminal in measuring a TA;

[0374] Based on the third indication information, configure the timer duration corresponding to the LTM cell handover;

[0375] Selecting a target cell for LTM cell handover for the terminal based on the fourth indication information;

[0376] Based on the fifth indication information, configure a target cell for LTM cell handover;

[0377] Determining, based on the sixth indication information, a timing for configuring a target cell for LTM cell handover;

[0378] Based on the seventh indication information, it is determined whether to configure non-contention RA resources for the terminal, and whether the configured RA resources are reasonable when the non-contention RA resources are configured.

[0379] In some embodiments, the receiving module 41 is further configured to:

[0380] The first information sent by the terminal is received during the process of the terminal entering the connected state or after the terminal enters the connected state.

[0381] In some embodiments, the network device is a network device corresponding to a target cell to which the LTM cell handover is successful; the receiving module 41 is further configured to:

[0382] When the terminal successfully performs LTM cell switching, a first request is sent to the terminal, and the first information sent by the terminal is received; the first request is used to request the terminal to report information related to performing LTM cell switching.

[0383] In some embodiments, the network device is a network device corresponding to the first cell; the receiving module 41 is further configured to:

[0384] In the event that the terminal fails to perform LTM cell switching, a second request is sent to the terminal, the first information sent by the terminal is received, and the first information is forwarded to the source network device or the candidate target network device; wherein the second request is used to request the terminal to report information related to performing LTM cell switching.

[0385] In practical application, the receiving module 41 can be implemented by the communication interface in the information transmission device.

[0386] It should be noted that the information transmission device provided in the above embodiments is illustrated only by the division of the aforementioned program modules when performing information transmission. In actual applications, the aforementioned processing can be assigned to different program modules as needed, that is, the internal structure of the device can be divided into different program modules to complete all or part of the aforementioned processing. In addition, the information transmission device provided in the above embodiments and the information transmission method embodiment are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0387] The embodiment of the present application further provides a terminal, as shown in FIG5 , including:

[0388] The first communication interface 51 is capable of exchanging information with other terminals;

[0389] The first processor 52 is connected to the first communication interface 51 and is configured to execute the method provided by one or more technical solutions on the terminal side when running a computer program. The computer program is stored in the first memory 53.

[0390] It should be noted that the specific processing procedures of the first processor 52 and the first communication interface 51 are detailed in the method embodiment and will not be repeated here.

[0391] Of course, in actual use, the various components in terminal 50 are coupled together via bus system 54. It will be appreciated that bus system 54 is used to enable communication between these components. In addition to a data bus, bus system 54 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in FIG5 , all of these buses are labeled as bus system 54.

[0392] The first memory 53 in the embodiment of the present application is used to store various types of data to support the operation of the terminal 50. Examples of such data include: any computer program used to operate on the terminal 50.

[0393] The methods disclosed in the above embodiments of the present application can be applied to the first processor 52 or implemented by the first processor 52. The first processor 52 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the first processor 52 or by software instructions. The above first processor 52 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The first processor 52 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application can be directly implemented as being executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium located in the first memory 53. The first processor 52 reads the information in the first memory 53 and, in conjunction with its hardware, completes the steps of the above method.

[0394] The embodiment of the present application further provides a network device, as shown in FIG6 , including:

[0395] The second communication interface 61 is capable of exchanging information with other terminals;

[0396] The second processor 62 is connected to the second communication interface 61 and is used to execute the method provided by one or more technical solutions on the network device side when running a computer program. The computer program is stored in the second memory 63.

[0397] It should be noted that the specific processing procedures of the second processor 62 and the second communication interface 61 are detailed in the method embodiment and will not be repeated here.

[0398] Of course, in actual use, the various components in network device 60 are coupled together via bus system 64. It will be appreciated that bus system 64 is used to enable communication between these components. In addition to a data bus, bus system 64 also includes a power bus, a control bus, and a status signal bus. However, for clarity, in FIG6 , all of these buses are labeled as bus system 64.

[0399] The second memory 63 in the embodiment of the present application is used to store various types of data to support the operation of the network device 60. Examples of such data include: any computer program used to operate on the network device 60.

[0400] The methods disclosed in the above embodiments of the present application can be applied to the second processor 62 or implemented by the second processor 62. The second processor 62 may be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method can be completed by hardware integrated logic circuits in the second processor 62 or by software instructions. The above second processor 62 may be a general-purpose processor, a digital signal processor (DSP), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The second processor 62 can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of the present application. A general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of the present application can be directly implemented and executed by a hardware decoding processor, or by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium located in the second memory 63. The second processor 62 reads the information in the second memory 63 and, in conjunction with its hardware, completes the steps of the above method.

[0401] In an exemplary embodiment, the terminal 50 and the network device 60 can be implemented by one or more application-specific integrated circuits (ASICs), DSPs, programmable logic devices (PLDs), complex programmable logic devices (CPLDs), field-programmable gate arrays (FPGAs), general-purpose processors, controllers, microcontrollers (MCUs), microprocessors, or other electronic components to execute the aforementioned method.

[0402] It can be understood that the memory (first memory 53, second memory 63) of the embodiment of the present application can be a volatile memory or a non-volatile memory, and can also include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), a magnetic random access memory (FRAM), a flash memory, a magnetic surface memory, an optical disc, or a compact disc read-only memory (CD-ROM); the magnetic surface memory can be a magnetic disk memory or a tape memory. The volatile memory can be a random access memory (RAM), which is used as an external cache. By way of example and not limitation, many forms of RAM are available, such as static random access memory (SRAM), synchronous static random access memory (SSRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus random access memory (DRRAM).The memories described in the embodiments of this application are intended to include, but are not limited to, these and any other suitable types of memories.

[0403] In an exemplary embodiment, the present application also provides a storage medium, namely, a computer storage medium, specifically a computer-readable storage medium, such as a memory storing a computer program. The computer program can be executed by the first processor 52 of the terminal 50 to complete the steps of the aforementioned terminal-side method. The computer-readable storage medium can be a memory such as FRAM, ROM, PROM, EPROM, EEPROM, Flash Memory, magnetic surface storage, optical disk, or CD-ROM.

[0404] Exemplarily, an embodiment of the present application also provides a computer program product, including a computer program, which can be executed by the first processor 52 of the terminal 50 to complete the steps of any of the aforementioned terminal side methods, and the computer program can be executed by the second processor 62 of the network device 60 to complete the steps of any of the aforementioned network device side methods.

[0405] It should be noted that: "first", "second", etc. are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0406] In addition, the technical solutions described in the embodiments of the present application can be arbitrarily combined without conflict.

[0407] The above description is merely a preferred embodiment of the present application and is not intended to limit the scope of protection of the present application.

Claims

1. A method for transmitting information, performed by a terminal, comprising: Sending first information to the network device; The first information represents relevant information of the terminal performing layer 1 or layer 2 triggered mobility LTM cell handover.

2. The method according to claim 1, wherein The first information includes one or more of the following: First instruction information; Second instruction information; Third instruction information; Fourth instruction information; Fifth instruction information; Sixth instruction information; Seventh instruction information; in, The first indication information represents the number of times the terminal receives a physical downlink control channel PDCCH instruction, where the PDCCH instruction is used to instruct the terminal to obtain a timing advance TA of a target cell in advance, or a time difference between a first moment when the terminal first receives the PDCCH instruction and a third moment when the terminal receives an LTM cell handover command, or a time difference between a second moment when the terminal sends a random access preamble and a third moment when the terminal receives the LTM cell handover command; The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference; The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover; The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails; The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover; The sixth indication information represents a time difference between a seventh moment of receiving a radio resource control RRC signaling and an eighth moment of switching the terminal to an LTM candidate cell or a target configuration; the RRC signaling carries a relevant configuration of LTM; or a time difference between a third moment of receiving an LTM cell handover command and a ninth moment of switching the terminal to the target configuration; The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive random access RA resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is a secondary uplink carrier SUL or a normal uplink carrier NUL; a random access preamble code index; a synchronization signal index or a physical broadcast channel PBCH index; and a physical random access channel PRACH mask index.

3. The method according to claim 1 or 2, wherein: The method further comprises: When the LTM cell handover meets the LTM cell handover success condition, the first information is recorded.

4. The method according to claim 1 or 2, wherein: The method further comprises: Under the LTM cell switching configuration of the network device, the first information is recorded.

5. The method according to claim 1 or 2, wherein: The method further comprises: After the terminal fails to perform LTM cell handover, if the terminal performs cell selection but fails to select an LTM candidate cell, the first information is recorded in the cell reconstruction process.

6. The method according to claim 1 or 2, wherein: The sending of the first information to the network device includes: The first information is sent to the network device during the process of the terminal entering the connected state or after the terminal enters the connected state.

7. The method according to claim 6, wherein: The sending the first information to the network device during or after the terminal enters the connected state includes: When the terminal successfully performs LTM cell switching, if the target cell to which the LTM cell switching is successful sends a first request to the terminal, the first information is sent to the network device corresponding to the target cell to which the LTM cell switching is successful; the first request is used to request the terminal to report information related to the execution of LTM cell switching.

8. The method according to claim 6, wherein: The sending the first information to the network device during or after the terminal enters the connected state includes: In the event that the terminal fails to perform LTM cell switching, if the first cell to which the terminal is successfully connected sends a second request to the terminal, the first information is sent to the network device corresponding to the first cell; wherein the second request is used to request the terminal to report information related to performing LTM cell switching, and the network device corresponding to the first cell forwards the first information to the source network device or the target network device.

9. An information transmission method, performed by a network device, comprising: receiving first information sent by a terminal; The first information represents relevant information of the terminal performing LTM cell handover.

10. The method according to claim 9, characterized in that The first information includes one or more of the following: First instruction information; Second instruction information; Third instruction information; Fourth instruction information; Fifth instruction information; Sixth instruction information; Seventh instruction information; in, The first indication information represents the number of times the terminal receives a PDCCH instruction, where the PDCCH instruction is used to instruct the terminal to obtain the TA of the target cell in advance, or the time difference between a first moment when the terminal first receives the PDCCH instruction and a third moment when the terminal receives the LTM cell handover command, or the time difference between a second moment when the terminal sends a random access preamble and a third moment when the terminal receives the LTM cell handover command; The second indication information represents an indication of whether the terminal obtains the TA of the target cell when receiving the LTM cell handover command, or whether the TA of the target cell is indicated by the base station or obtained by the UE, or the time difference between the fourth moment when the terminal obtains the TA of the target cell and the third moment when the LTM cell handover command is received, or an indication of whether the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset threshold, or an indication of whether the ratio corresponding to the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself is greater than a preset ratio threshold, or the difference between the first TA carried by the LTM cell handover command and the second TA measured by the terminal itself or the ratio corresponding to the difference; The third indication information represents a time difference between a third moment when the terminal receives the LTM cell handover command and a fifth moment when the terminal successfully performs the LTM cell handover, or a time difference between the third moment when the terminal receives the LTM cell handover command and a sixth moment when the terminal successfully transmits the first uplink data or the network side successfully receives the first uplink data of the terminal, or a proportion or percentage of the timer corresponding to the successful LTM cell handover; The fourth indication information indicates whether the cell selected by the terminal during cell selection after the LTM cell handover fails is an LTM candidate cell, or the cell identifier of the LTM candidate cell selected by the terminal during cell selection after the LTM cell handover fails; The fifth indication information represents an identifier of a cell in the configured LTM candidate cells to which the terminal has never performed LTM cell handover; The sixth indication information represents a time difference between a seventh moment of receiving RRC signaling and an eighth moment of switching the terminal to the LTM candidate cell or target configuration; the RRC signaling carries the relevant configuration of LTM; or a time difference between a third moment of receiving the LTM cell handover command and a ninth moment of switching the terminal to the target configuration; The seventh indication information indicates whether the LTM cell switching command carries a configuration indication of a non-competitive RA resource, or related information of the non-competitive RA resource; wherein the related information of the non-competitive RA resource includes one or more of the following: whether the carrier where the non-competitive RA resource is located is SUL or NUL; random access preamble code index; synchronization signal index or PBCH index; PRACH mask index.

11. The method according to claim 10, wherein: The method further comprises: Do at least one of the following: Based on the first indication information, configure a random access preamble corresponding to a target cell for LTM cell handover; Determining, based on the second indication information, a timing for sending an LTM cell handover command, and determining whether to assist the terminal in measuring a TA; Based on the third indication information, configure the timer duration corresponding to the LTM cell handover; Selecting a target cell for LTM cell handover for the terminal based on the fourth indication information; Based on the fifth indication information, configure a target cell for LTM cell handover; Determining, based on the sixth indication information, a timing for configuring a target cell for LTM cell handover; Based on the seventh indication information, it is determined whether to configure non-contention RA resources for the terminal, and whether the configured RA resources are reasonable when the non-contention RA resources are configured.

12. The method according to any one of claims 9 to 11, wherein: The first information sent by the receiving terminal includes: The first information sent by the terminal is received during the process of the terminal entering the connected state or after the terminal enters the connected state.

13. The method according to claim 12, wherein: The network device is a network device corresponding to a target cell in which the LTM cell handover is successful; and the receiving the first information sent by the terminal during or after the terminal enters the connected state includes: When the terminal successfully performs LTM cell switching, a first request is sent to the terminal, and the first information sent by the terminal is received; the first request is used to request the terminal to report information related to performing LTM cell switching.

14. The method according to claim 12, wherein: The network device is a network device corresponding to the first cell; and the receiving, during the process of the terminal entering the connected state or after the terminal enters the connected state, the first information sent by the terminal includes: In the event that the terminal fails to perform LTM cell switching, a second request is sent to the terminal, the first information sent by the terminal is received, and the first information is forwarded to the source network device or the target network device; wherein the second request is used to request the terminal to report information related to performing LTM cell switching.

15. An information transmission device, comprising: A sending module, configured to send first information to a network device; The first information represents relevant information of the terminal performing LTM cell handover.

16. An information transmission device, comprising: A receiving module, configured to receive first information sent by a terminal; The first information represents relevant information of the terminal performing LTM cell handover.

17. A terminal comprising a processor and a memory for storing a computer program capable of running on the processor, in, When the processor is used to run the computer program, the processor performs the steps of the method according to any one of claims 1 to 8.

18. A network device comprising a processor and a memory for storing a computer program capable of being run on the processor, in, When the processor is used to run the computer program, the processor performs the steps of the method according to any one of claims 9 to 14.

19. A computer-readable storage medium having a computer program stored thereon, wherein: When the computer program is executed by a processor, the computer program implements the steps of the method according to any one of claims 1 to 8, or implements the steps of the method according to any one of claims 9 to 14.

20. A computer program product comprising a computer program, wherein When the computer program is executed by a processor, the method according to any one of claims 1 to 8 is implemented, or the method according to any one of claims 9 to 14 is implemented.

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