Early timing advance acquisition optimization method and device, communication device and storage medium

Abstract

The invention relates to an earlier-stage timing advance acquisition optimization method and device, a communication device and a storage medium. In at least one embodiment of the present disclosure, if a terminal stores mobility LTM configuration information triggered by a layer 1 / layer 2, the terminal records first related information in an earlier timing advance (TA) acquisition process, and then sends the first related information to a network device. The first related information is used for the network equipment to carry out the early TA acquisition optimization, that is, the network equipment carries out the early TA acquisition optimization based on the first related information in the early TA acquisition process reported by the terminal, and compared with the prior art that the network equipment cannot optimize the early TA acquisition process, the network equipment can obtain the early TA according to the first related information. According to the embodiment of the invention, the network equipment can carry out the early TA acquisition optimization according to the first related information in the early TA acquisition process, and the early TA acquisition performance is improved.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and more particularly to a method and device for optimizing early timing advance acquisition, a communication device, and a storage medium. Background Art

[0002] With the development of communication technology, new random access mechanisms can obtain early timing advance (early TA) to achieve early uplink synchronization. In traditional self-organized networks (SON) or minimized drive test (MDT), the random access channel (RACH) is optimized, but the optimization of the early TA acquisition process is not considered. Therefore, there is an urgent need to provide an early TA optimization solution to enable network devices to optimize the early TA acquisition process. Summary of the Invention

[0003] At least one embodiment of the present disclosure provides a method, apparatus, communication device, and storage medium for optimizing early timing advance acquisition.

[0004] In a first aspect, an embodiment of the present disclosure provides a method for optimizing early timing advance acquisition, which is applied to a terminal. The method includes:

[0005] If the terminal stores the layer 1 / layer 2 triggered mobility LTM configuration information, the terminal records the first relevant information in the early TA acquisition process;

[0006] The terminal sends the first relevant information to the network device.

[0007] In some embodiments, the first relevant information includes at least one of the following:

[0008] Random access channel RACH resource information;

[0009] Candidate target cell information;

[0010] Time information;

[0011] Auxiliary information.

[0012] In some embodiments, the RACH resource information includes at least one of the following:

[0013] Preamble index;

[0014] Uplink / supplemental uplink indication information;

[0015] Synchronization signal or physical broadcast channel index;

[0016] Physical random access channel mask index;

[0017] The timing advance offset to be applied to all uplink transmissions on the candidate cell;

[0018] Physical random access channel root sequence index;

[0019] The number of synchronization signal blocks per physical random access channel opportunity;

[0020] LTM physical random access channel subcarrier spacing.

[0021] In some embodiments, the candidate target cell information includes at least one of the following:

[0022] Candidate target cell identification information during the early TA acquisition process;

[0023] Candidate target cell identification information for LTM cell change;

[0024] The target cell of the most recent LTM execution;

[0025] The TA value of the most recent LTM execution;

[0026] Indication of whether the most recent LTM execution of RACH-less was successful;

[0027] Number of early TA acquisitions of candidate target cells;

[0028] Indication information indicating whether it is the last selected target candidate cell.

[0029] In some embodiments, the time information includes at least one of the following:

[0030] The absolute and / or relative time at which the terminal sends the preamble;

[0031] The time interval from the last early TA acquisition to the receipt of the LTM cell change command;

[0032] For a candidate cell, the time interval from the last preamble code transmission to the next preamble code transmission.

[0033] In some embodiments, the auxiliary information includes at least one of the following:

[0034] Indication information indicating that the RACH type is early TA acquisition or early RACH;

[0035] Indication information of RACH collision;

[0036] Information on the type of RACH that collided;

[0037] Early TA obtains an indication of success or failure;

[0038] Indication of failure in sending the preamble;

[0039] Preamble power ramp counter value;

[0040] Number of preamble power ramp-up steps;

[0041] Indication information of whether the preamble is retransmitted;

[0042] The reason value for the preamble not being sent successfully.

[0043] In some embodiments, the terminal records first relevant information during the early TA acquisition process, including:

[0044] The terminal records the first relevant information in the early TA acquisition process in a report, where the report includes at least one of the following:

[0045] RACH report;

[0046] Custom reports;

[0047] Non-RACH reporting.

[0048] In some embodiments, the terminal sends the first relevant information to the network device, including:

[0049] The terminal sends instruction information to the network device, where the instruction information is used to instruct the network device to obtain the first relevant information from the terminal; the terminal sends the first relevant information to the network device in response to the first relevant information request message sent by the network device;

[0050] Or, after recording the first relevant information, the terminal sends the first relevant information to the network device;

[0051] Alternatively, the terminal receives a first related information request message sent by the network device; and in response to the first related information request message sent by the network device, the terminal sends the first related information to the network device.

[0052] In some embodiments, the first relevant information includes at least one of the following:

[0053] Early TA obtains success-related information;

[0054] Early TA failed to obtain relevant information.

[0055] In some embodiments, the terminal records the first relevant information in the early TA acquisition process, including: the terminal records the first relevant information for each RACH process and / or each candidate cell.

[0056] In a second aspect, the embodiments of the present disclosure further provide a method for optimizing early timing advance acquisition, which is applied to a network device. The method includes:

[0057] The network device receives the first relevant information sent by the terminal and / or the second relevant information recorded by the network device during the early TA acquisition process, wherein the first relevant information is the first relevant information recorded by the terminal during the early TA acquisition process.

[0058] In some embodiments, the second relevant information includes at least one of the first relevant information and / or at least one of the following information:

[0059] Random access radio network temporary identifier RA-RNTI;

[0060] Timing Advance TA value;

[0061] Source distributed unit Source DU identification information;

[0062] Candidate distributed unit Candidate DU identification information;

[0063] This PDCCH order command indicates whether the preamble value sent by the terminal has been received;

[0064] The number of times the early TA acquisition process is triggered for each candidate cell;

[0065] The absolute or relative time when the PDCCH order command is sent.

[0066] In some embodiments, the early timing advance acquisition optimization method further includes:

[0067] The network device performs early TA acquisition optimization based on the first relevant information and / or the second relevant information;

[0068] or,

[0069] The network device sends the first relevant information and / or the second relevant information to the network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or the second relevant information.

[0070] In a third aspect, an embodiment of the present disclosure further provides an early timing advance acquisition optimization device, which is applied to a terminal, wherein the terminal stores layer 1 / layer 2 triggered mobility LTM configuration information, and the device includes:

[0071] A recording unit, configured to record first relevant information in an early TA acquisition process;

[0072] The sending unit is configured to send the first relevant information to the network device.

[0073] In a fourth aspect, the embodiments of the present disclosure further provide a device for optimizing early timing advance acquisition, which is applied to a network device. The device includes:

[0074] The receiving unit is configured to receive first relevant information sent by the terminal and / or record second relevant information in the early TA acquisition process, wherein the first relevant information is the first relevant information in the early TA acquisition process recorded by the terminal.

[0075] In a fifth aspect, an embodiment of the present disclosure further provides a communication device, which includes a memory, a transceiver, and a processor;

[0076] A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer programs in the memory and executing:

[0077] If the layer 1 / layer 2 triggered mobility LTM configuration information is stored, the first relevant information in the early TA acquisition process is recorded;

[0078] The first relevant information is sent to the network device.

[0079] In some embodiments, the first relevant information includes at least one of the following:

[0080] Random access channel RACH resource information;

[0081] Candidate target cell information;

[0082] Time information;

[0083] Auxiliary information.

[0084] In some embodiments, the RACH resource information includes at least one of the following:

[0085] Preamble index;

[0086] Uplink / supplemental uplink indication information;

[0087] Synchronization signal or physical broadcast channel index;

[0088] Physical random access channel mask index;

[0089] The timing advance offset to be applied to all uplink transmissions on the candidate cell;

[0090] Physical random access channel root sequence index;

[0091] The number of synchronization signal blocks per physical random access channel opportunity;

[0092] LTM physical random access channel subcarrier spacing.

[0093] In some embodiments, the candidate target cell information includes at least one of the following:

[0094] Candidate target cell identification information during the early TA acquisition process;

[0095] Candidate target cell identification information for LTM cell change;

[0096] The target cell of the most recent LTM execution;

[0097] The TA value of the most recent LTM execution;

[0098] Indication of whether the most recent LTM execution of RACH-less was successful;

[0099] Number of early TA acquisitions of candidate target cells;

[0100] Indication information indicating whether it is the last selected target candidate cell.

[0101] In some embodiments, the time information includes at least one of the following:

[0102] The absolute and / or relative time at which the preamble was sent;

[0103] The time interval from the last early TA acquisition to the receipt of the LTM cell change command;

[0104] For a candidate cell, the time interval from the last preamble code transmission to the next preamble code transmission.

[0105] In some embodiments, the auxiliary information includes at least one of the following:

[0106] Indication information indicating that the RACH type is early TA acquisition or early RACH;

[0107] Indication information of RACH collision;

[0108] Information on the type of RACH that collided;

[0109] Early TA obtains an indication of success or failure;

[0110] Indication of failure in sending the preamble;

[0111] Preamble power ramp-up counter value;

[0112] Number of preamble power ramp-up steps;

[0113] Indication information of whether the preamble is retransmitted;

[0114] The reason value for the preamble not being sent successfully.

[0115] In some embodiments, recording first relevant information during the early TA acquisition process includes:

[0116] The first relevant information in the early TA acquisition process is recorded in a report, where the report includes at least one of the following:

[0117] RACH report;

[0118] Custom reports;

[0119] Non-RACH reporting.

[0120] In some embodiments, sending the first relevant information to the network device includes:

[0121] Sending instruction information to the network device, where the instruction information is used to instruct the network device to obtain the first relevant information; and sending the first relevant information to the network device in response to the first relevant information request message sent by the network device;

[0122] Or, after recording the first relevant information, send the first relevant information to the network device;

[0123] Or, receiving a first related information request message sent by the network device; and sending the first related information to the network device in response to the first related information request message sent by the network device.

[0124] In some embodiments, the first relevant information includes at least one of the following:

[0125] Early TA obtains success-related information;

[0126] Early TA failed to obtain relevant information.

[0127] In some embodiments, recording first relevant information during the early TA acquisition process includes:

[0128] The first relevant information is recorded for each RACH process and / or each candidate cell.

[0129] In a sixth aspect, an embodiment of the present disclosure further provides a communication device, which includes a memory, a transceiver, and a processor;

[0130] A memory for storing computer programs; a transceiver for transmitting and receiving data under the control of a processor; and a processor for reading the computer programs in the memory and executing:

[0131] The first relevant information sent by the terminal is received and / or the second relevant information in the early TA acquisition process is recorded, wherein the first relevant information is the first relevant information in the early TA acquisition process recorded by the terminal.

[0132] In some embodiments, the second relevant information includes at least one of the first relevant information and / or at least one of the following information:

[0133] Random access radio network temporary identifier RA-RNTI;

[0134] Timing Advance TA value;

[0135] Source distributed unit Source DU identification information;

[0136] Candidate distributed unit Candidate DU identification information;

[0137] This PDCCH order command indicates whether the preamble value sent by the terminal has been received;

[0138] The number of times the early TA acquisition process is triggered for each candidate cell;

[0139] The absolute or relative time when the PDCCH order command is sent.

[0140] In some embodiments, the processor is further configured to:

[0141] performing early TA acquisition optimization based on the first relevant information and / or the second relevant information;

[0142] or,

[0143] The first relevant information and / or the second relevant information are sent to a network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or the second relevant information.

[0144] In the seventh aspect, an embodiment of the present disclosure further proposes a processor-readable storage medium, wherein the processor-readable storage medium stores a program, and the program is used to enable the processor to execute the early timing advance acquisition optimization method of any embodiment of the first aspect or the early timing advance acquisition optimization method of any embodiment of the second aspect.

[0145] In at least one embodiment of the present disclosure, after a terminal stores the Layer 1 / Layer 2-triggered mobility LTM configuration information, the terminal records first relevant information from a pre-timed advance early TA acquisition process and then sends the first relevant information to a network device. The first relevant information is used by the network device to optimize early TA acquisition. Specifically, the network device optimizes early TA acquisition based on the first relevant information from the early TA acquisition process reported by the terminal. Compared to prior art techniques in which network devices are unable to optimize the early TA acquisition process, this embodiment enables the network device to optimize the first relevant information from the early TA acquisition process, thereby improving early TA acquisition performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0146] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the embodiments or descriptions of the prior art. Obviously, the drawings described below are only some embodiments of the present disclosure, and a person skilled in the art can also obtain other drawings based on these drawings.

[0147] Figure 1 A flowchart of a method for optimizing early timing acquisition provided by an embodiment of the present disclosure;

[0148] Figure 2 A schematic diagram of a terminal recording first relevant information provided by an embodiment of the present disclosure;

[0149] Figure 3 A schematic diagram of a terminal recording first relevant information provided by an embodiment of the present disclosure;

[0150] Figure 4 A schematic diagram of a terminal recording first relevant information provided by an embodiment of the present disclosure;

[0151] Figure 5 A schematic diagram of a terminal recording first relevant information provided by an embodiment of the present disclosure;

[0152] Figure 6 A schematic diagram of a terminal recording first relevant information provided by an embodiment of the present disclosure;

[0153] Figure 7A schematic diagram of a terminal recording first relevant information provided by an embodiment of the present disclosure;

[0154] Figure 8A A schematic diagram of an early timing advance acquisition optimization device provided by an embodiment of the present disclosure;

[0155] Figure 8B Schematic diagram of another early timing advance acquisition optimization device provided by an embodiment of the present disclosure

[0156] Figure 9 A schematic diagram of a communication device provided in an embodiment of the present disclosure;

[0157] Figure 10 A schematic diagram of another communication device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0158] In order to more clearly understand the above-mentioned purposes, features and advantages of the present disclosure, the present disclosure is further described in detail below with reference to the accompanying drawings and examples. It will be understood that the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. The specific embodiments described herein are merely used to explain the present disclosure, rather than to limit the present disclosure. Based on the described embodiments of the present disclosure, all other embodiments obtained by those of ordinary skill in the art are within the scope of protection of the present disclosure.

[0159] It should be noted that, in this document, relational terms such as “first” and “second” are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0160] (1) Layer 1 / Layer 2 triggered mobility (LTM)

[0161] The LTM mechanism means that the network pre-configures multiple candidate cell configurations and their Layer 1 (L1) measurement configurations for the terminal. The terminal performs L1 measurement based on the L1 measurement configuration configured by the network and reports it. The network sends an LTM cell change (LTM cell switch) command to the terminal based on the L1 measurement results reported by the terminal. This LTM cell switch command is sent to the terminal via the Medium Access Control (MAC) Control Element (CE).

[0162] (2) Early TA

[0163] During the LTM preconfiguration phase, the network preconfigures random access resources for the terminal to acquire early TA. These random access resources are configured for each candidate cell. These random access resources are also sent to the source distributed unit (DU), which uses them to send a physical downlink control channel order (PDCCH order) to trigger the early TA acquisition process.

[0164] After a terminal is configured with LTM, if the network wishes to obtain the terminal's uplink (UL) TA value with a candidate cell for early uplink synchronization, the source DU sends a Physical Downlink Control Channel (PDCCH) order command to the terminal to trigger the early TA acquisition process. Upon receiving this PDCCH order command, the terminal sends a preamble to the target candidate DU based on network instructions. Upon receiving the preamble, the target candidate DU derives the TA value and sends the TA value and related information to the source DU. When the source DU decides to switch to this candidate cell, it sends the TA value to the UE in an LTM cell switch command. The UE then receives this TA value and can access the candidate cell using RACH-less LTM.

[0165] From the terminal's perspective, once the preamble is successfully transmitted, the terminal considers the RACH procedure successful and does not wait for or receive a Random Access Response (RAR). If the source DU does not receive the TA from the candidate DU, the source DU can resend the PDCCH order command to instruct the terminal to resend the preamble. When the terminal receives the PDCCH order command sent by the network to trigger the execution of early TA acquisition, if a RACH procedure is currently in progress in the terminal's MAC entity, the terminal implementation determines whether to continue the current RACH procedure or execute the early TA acquisition procedure.

[0166] Because traditional SON / MDT does not consider the optimization of the early TA acquisition process when optimizing RACH, it may cause the following problems (1) to (3):

[0167] (1) If the optimization of the early TA acquisition process is considered and the RACH of the new random access mechanism is recorded and reported according to the existing RACH recording and reporting method, the frequent early TA acquisition may affect the existing RACH recording and reporting. For example, frequent early TA acquisition may fill up the RACH report, resulting in the inability to record and report in the subsequent legacy RACH process.

[0168] (2) If the optimization of the early TA acquisition process is considered, and the RACH of the new random access mechanism is recorded and reported according to the existing RACH recording and reporting method, since the existing RACH report records the successful RACH process for the legacy RACH, and records the information related to the early TA acquisition failure in the Radio Link Failure (RLF) report and non-RLF reports (for example, CEF report), if the recording and reporting of the information related to the early TA acquisition failure is not considered, the network cannot optimize the early TA acquisition failure or the optimization of the network for the early TA acquisition failure is affected. Therefore, it is also necessary to consider how to record and report the information related to the failed early TA acquisition.

[0169] (3) If the optimization of the early TA acquisition process is not considered, early TA acquisition optimization may not be possible in the following situations:

[0170] Case 1: The network fails to receive the preamble sent by the terminal one or more times (due to RACH resource issues, RACH collision, insufficient power, etc.), causing the network to re-trigger the terminal to send the preamble, resulting in a waste of air interface resources and increased terminal energy consumption.

[0171] Case 2: The network triggers early TA acquisition too early, requiring multiple early TA acquisitions, wasting air interface resources and increasing terminal energy consumption.

[0172] Case 3: The network performs early TA acquisition on many candidate cells, but only one or a few of them are likely to become the final target cell. Additional early TA acquisitions will waste power and resources.

[0173] At least one embodiment of the present disclosure provides an early TA acquisition optimization method, apparatus, communication device, or storage medium. After a terminal stores Layer 1 / Layer 2-triggered mobility LTM configuration information, the terminal records first relevant information during an early TA acquisition process and then sends the first relevant information to a network device. The first relevant information is used by the network device to optimize early TA acquisition. That is, the network device optimizes early TA acquisition based on the first relevant information during the early TA acquisition process reported by the terminal. Compared to the prior art, in which the network device is unable to optimize the early TA acquisition process, this embodiment enables the network device to optimize early TA acquisition based on the first relevant information during the early TA acquisition process, thereby improving early TA acquisition performance.

[0174] Figure 1 This is a flow chart of a method for optimizing the acquisition of early timing advance provided by an embodiment of the present disclosure, and the method for optimizing the acquisition of early timing advance is applied to a terminal. Figure 1 As shown, the early timing advance acquisition optimization method may include but is not limited to step 101 and step 102:

[0175] In step 101, if the terminal stores the layer 1 / layer 2 triggered mobility LTM configuration information, the terminal records the first relevant information in the early TA acquisition process.

[0176] In step 102, the terminal sends first relevant information to the network device.

[0177] In this embodiment, the first relevant information is used by the network device to optimize early TA acquisition. That is, the network device performs early TA acquisition optimization based on the first relevant information in the early TA acquisition process reported by the terminal. Compared with the prior art, the network device is unable to optimize the early TA acquisition process. In this embodiment, the network device can perform early TA acquisition optimization based on the first relevant information in the early TA acquisition process, thereby improving the performance of early TA acquisition.

[0178] In some embodiments, the first relevant information in the early TA acquisition process includes at least one of the following:

[0179] Early TA obtains information related to success.

[0180] Early TA failed to obtain relevant information.

[0181] The first relevant information includes but is not limited to at least one of the following: RACH resource information, candidate target cell information, time information, and auxiliary information.

[0182] RACH resource information includes but is not limited to at least one of the following:

[0183] Preamble index;

[0184] Uplink / Supplementary Uplink indicator (UL / SUL indicator);

[0185] Synchronization signal or physical broadcast channel index (SS / PBCH index); including the SS / PBCH index in the existing RACH report;

[0186] Physical random access channel mask index (PRACH Mask index);

[0187] The timing advance offset n-TimingAdvanceOffset applied to all uplink transmissions on the candidate cell;

[0188] Physical random access channel root sequence index (prach-RootSequenceIndex);

[0189] Number of synchronization signal blocks per physical random access channel opportunity (ssb-PerRACH-Occasion);

[0190] LTM physical random access channel subcarrier spacing (ltm-prach-SubcarrierSpacing).

[0191] The candidate target cell information includes but is not limited to at least one of the following:

[0192] Candidate target cell identification information during the early TA acquisition process;

[0193] Candidate target cell identification information for LTM cell switch;

[0194] The target cell of the most recent LTM execution;

[0195] The TA value of the most recent LTM execution;

[0196] Indication of whether the most recent LTM execution of RACH-less was successful;

[0197] Number of early TA acquisitions of candidate target cells;

[0198] Indication information indicating whether it is the last selected target candidate cell.

[0199] In this embodiment, the terminal extracts candidate cell indication information (CellIndicator) from the PDCCH order command as candidate target cell identification information for the early TA acquisition process. The terminal receives an LTM cell switch command and extracts identification information of the candidate target cell indicated in the configuration identification information from the LTM cell switch command as candidate target cell identification information for the LTM cell switch. The configuration identification information in the LTM cell switch command can be extracted as candidate target cell identification information for the LTM cell switch.

[0200] In some embodiments, whether it is the candidate target cell identification information of the early TA acquisition process or the candidate target cell identification information of the LTM cell switch, the terminal can record the physical cell ID (PCI) and frequency information of the candidate target cell, or the terminal can record the global cell unified identification (CGI) information of the candidate target cell.

[0201] Time information includes but is not limited to at least one of the following:

[0202] The absolute and / or relative time at which the terminal sends the preamble;

[0203] For a candidate cell, the time interval from the last preamble transmission to the next preamble transmission;

[0204] The time interval from the last early TA acquisition to the receipt of the LTM cell switch command. In this embodiment, the time interval can be the time interval from the last early TA acquisition of a non-candidate target cell or the time interval from the last early TA acquisition of a candidate target cell to the receipt of the LTM cell switch command.

[0205] Auxiliary information includes but is not limited to at least one of the following:

[0206] The RACH type is early TA acquisition or early RACH indication information. The RACH type is used to indicate to the network that this RACH process is for early TA acquisition. In some embodiments, the RACH type can be explicit or implicit information.

[0207] RACH collision indication information: This indication information is used to indicate whether a RACH collision occurs in this RACH process.

[0208] Indication of success or failure of early TA acquisition. This indication is used to indicate whether the early TA acquisition process is successful.

[0209] Preamble transmission failure indication information. This indication information is used to indicate whether the preamble transmission has failed.

[0210] Preamble power ramping counter (PREAMBLE_POWER_RAMPING_COUNTER) value.

[0211] The preamble power ramping step number (PREAMBLE_POWER_RAMPING_STEP) value.

[0212] Indication information of whether the preamble is retransmitted. This indication information is used to indicate whether the current preamble transmission is a preamble retransmission.

[0213] The reason value for the preamble not being sent successfully. This reason value includes but is not limited to: RACH collision, RACH resource problem, and power problem.

[0214] In some embodiments, in step 101, the terminal records the first relevant information in the early TA acquisition process, which can be achieved in multiple ways, such as the following ways 1 to 6:

[0215] Method 1:

[0216] Figure 2 A schematic diagram of a terminal recording first related information provided by an embodiment of the present disclosure, wherein the first related information is a list having multiple entries. Figure 2 In the first related information list, there are four entries. RACH related information for each early TA acquisition process is recorded in one entry of the list. For example, the first related information list is recorded in a RACH report. That is, each entry in the RACH report corresponds to the content of an entry in the first related information list (the content is the RACH related information for one early TA acquisition process).

[0217] Method 2:

[0218] Figure 3A schematic diagram of a terminal recording first related information provided by an embodiment of the present disclosure, Figure 3 In the , the first related information is a list and at least one common information (IEs), the non-common content of the RACH related information of each early TA acquisition process is recorded in an entry of the list, and the common content is recorded in the common information outside the list. Figure 3 The RACH related information of four early TA acquisition processes is recorded, so the list has four entries, recording the non-common content of each time.

[0219] In some embodiments, the terminal records the first related information in a RACH report, the RACH report has multiple entries, and the list and IEs of the first related information are all recorded in the same entry of the RACH report. Figure 3 The content shown (a list of first related information (4 entries) and IEs) is recorded in one entry of the RACH report.

[0220] It should be noted that the number of early TA acquisition processes (RACH process counts) that can be recorded in a RACH report entry can be fixed or network-configured. Each early TA acquisition process can end with the receipt of an LTM cell switch command, the release of the LTM configuration, or the release of the early TA acquisition configuration, without limitation. The terminal can start recording upon receipt of LTM configuration information or early TA configuration information, without limitation.

[0221] Method 3:

[0222] Figure 4 A schematic diagram of a terminal recording first related information provided by an embodiment of the present disclosure, Figure 4 In the process, the terminal can record the first relevant information in the early TA acquisition process for each candidate cell (Per candidate), that is, each candidate cell records a set of RACH related information (regardless of whether the same candidate cell is in the adjacent early TA acquisition process, it is recorded in the same entry). Figure 4 In the RACH report, the terminal records a set of RACH related information for each of the three candidate cells in three entries.

[0223] Method 4:

[0224] Figure 5 A schematic diagram of a terminal recording first related information provided by an embodiment of the present disclosure, Figure 5 In the early TA acquisition process, the terminal can record the first relevant information for each candidate cell (Per candidate), that is, each candidate cell records a set of RACH related information, but Figure 4 The difference is that only the adjacent early TA acquisition processes of the same candidate cell are recorded in the same entry.

[0225] For example, the order in which the terminal accesses candidate cells is candidate cell 3, candidate cell 5, candidate cell 5, candidate cell 2, and candidate cell 5. It can be seen that candidate cell 5 has two adjacent early TA acquisition processes. Therefore, these two adjacent early TA acquisition processes are recorded in the same entry.

[0226] Method 5:

[0227] Figure 6 A schematic diagram of a terminal recording first related information provided by an embodiment of the present disclosure, Figure 6 In the , each candidate cell records a list, that is, a list containing multiple entries. Regardless of whether the same candidate cell is in the adjacent early TA acquisition process, it is recorded in different entries of this candidate cell list.

[0228] Method 6:

[0229] Figure 7 A schematic diagram of a terminal recording first related information provided by an embodiment of the present disclosure, Figure 7 In the example, each candidate cell records a list, that is, a list containing multiple entries. If the same candidate cell is in the early TA acquisition process of a nearby candidate cell, it can be recorded in the same entry of the candidate cell list. If it is not nearby, it can be recorded in different entries of the candidate cell list. Taking the example of method 4 as an example, the recording method of method 6 is as follows: Figure 7 shown.

[0230] Example 1

[0231] The terminal may record the first relevant information in the early TA acquisition process for each RACH (Per RACH) process. The specific description is as follows:

[0232] The network configures LTM configuration information for the terminal, which includes early TA configuration information. The early TA configuration information is required for early TA acquisition. After receiving the LTM configuration information from the network, the terminal performs L1 measurements and reports based on the LTM configuration information, which is a standard operation in the field. However, because the LTM configuration information includes early TA configuration information, the terminal performs the early TA acquisition process. Specifically, the early TA acquisition process is triggered by the PDCCH order command sent by the source DU. That is, after receiving the PDCCH order command sent by the source DU, the terminal performs the early TA acquisition process.

[0233] The information carried in the PDCCH order command includes but is not limited to at least one of the following:

[0234] Preamble index;

[0235] Uplink / supplementary uplink indication information (UL / SUL indicator);

[0236] Synchronization signal or physical broadcast channel index (SS / PBCH index);

[0237] Physical random access channel mask index (PRACH Mask index);

[0238] Candidate cell indication information (Cell indicator);

[0239] PRACH retransmission indicator information (PRACH retransmission indicator).

[0240] As an example, the network configures candidate cells 1, 2, 3, 4, 5, and 6 for the terminal, and configures a set of early TA configuration information for each candidate cell. When the network configures the early TA configuration information for the terminal, it also sends this early TA configuration information to the source DU, which uses it to send the PDCCH order command. The following describes the details of how the terminal records the first relevant information during the early TA acquisition process through each RACH (Per RACH) process for different scenarios (Scenarios 1 to 3).

[0241] Scenario 1:

[0242] If the network wishes to obtain the TA value between the terminal and candidate cell 3, the source DU sends a PDCCH order command to the terminal. The candidate cell indicator in the PDCCH order command indicates candidate cell 3. After receiving the PDCCH order command from the source DU, the terminal sends a preamble to candidate DU 3 (i.e., the distributed unit of candidate cell 3) based on the Cell indicator indicating candidate cell 3. After the terminal successfully sends the preamble, the terminal considers the RACH process in this early TA acquisition process successful and records the relevant information of this early TA acquisition success. After receiving the preamble sent by the terminal, candidate DU 3 sends the TA value and related information of the TA value to the source DU. The TA value and related information of the TA value are maintained by the source DU for use when the source DU sends the LTM cell switch command. The relevant information of the early TA acquisition success includes but is not limited to at least one of the following: RACH resource information, candidate target cell information, time information, and auxiliary information.

[0243] RACH resource information includes but is not limited to at least one of the following:

[0244] Preamble index: In this embodiment, the terminal extracts the preamble index value from the PDCCH order.

[0245] Uplink / supplementary uplink indication information (UL / SUL indicator): In this embodiment, the terminal extracts the UL / SUL indicator value from the PDCCH order.

[0246] Synchronization signal or physical broadcast channel index (SS / PBCH index). In this embodiment, the terminal extracts the SS / PBCH index value from the PDCCH order.

[0247] Physical Random Access Channel Mask Index (PRACH Mask Index): In this embodiment, the terminal extracts the PRACH Mask Index value from the PDCCH order.

[0248] In this embodiment, the terminal extracts the n-TimingAdvanceOffset value from the early TA configuration information of candidate cell 3 in the LTM configuration information.

[0249] Physical random access channel root sequence index (prach-RootSequenceIndex): In this embodiment, the terminal extracts the prach-RootSequenceIndex value from the early TA configuration information of candidate cell 3 in the LTM configuration information.

[0250] Number of synchronization signal blocks per physical random access channel opportunity (ssb-PerRACH-Occasion) In this embodiment, the terminal extracts the ssb-PerRACH-Occasion value from the early TA configuration information of candidate cell 3 in the LTM configuration information.

[0251] LTM physical random access channel subcarrier spacing (ltm-prach-SubcarrierSpacing): In this embodiment, the terminal extracts the ltm-prach-SubcarrierSpacing value from the early TA configuration information of candidate cell 3 in the LTM configuration information.

[0252] The candidate target cell information includes, but is not limited to, candidate target cell identification information for the early TA acquisition process. In this embodiment, the terminal may extract candidate cell indication information (Cell indicator) from the PDCCH order command as the candidate target cell identification information for the early TA acquisition process, or the terminal may record the physical cell ID (PCI) and frequency information of the candidate target cell, or the terminal may record the global cell identifier (CGI) information of the candidate target cell.

[0253] The time information includes at least one of the following:

[0254] The absolute and / or relative time when the terminal sends the preamble.

[0255] For a candidate cell, the time interval from the last preamble transmission to the next preamble transmission. In this embodiment, for candidate cell 3, the time interval from the last preamble transmission to the next preamble transmission is recorded.

[0256] The auxiliary information includes at least one of the following:

[0257] Indication information indicating that the RACH type is early TA acquisition or early RACH.

[0258] Indication information of RACH collision occurrence: In this embodiment, the indication information is used to indicate that no RACH collision occurs in this RACH process.

[0259] Indication information of success or failure of early TA acquisition. In this embodiment, the indication information is used to indicate that the early TA acquisition process is successful.

[0260] Indication information indicating that the preamble has failed to be sent. In this embodiment, the indication information is used to indicate that the preamble has been sent successfully.

[0261] The preamble power ramping counter value (PREAMBLE_POWER_RAMPING_COUNTER) is set to 1 in this embodiment.

[0262] Preamble power ramping step value (PREAMBLE_POWER_RAMPING_STEP): In this embodiment, the terminal extracts the powerRampingStep value from the early TA configuration information of candidate cell 3 in the LTM configuration information as the preamble power ramping step value.

[0263] Indication information of whether it is a preamble retransmission. In this embodiment, the indication information is used to indicate that the current preamble transmission is not a preamble retransmission.

[0264] It should be noted that the information related to the successful early TA acquisition can be recorded in an entry as a record of a RACH process. In some embodiments, some information can be recorded outside the entry as common information for all entries, such as RACH type information.

[0265] Scenario 2:

[0266] If the network wishes to obtain the TA value between the terminal and candidate cell 5, the source DU sends a PDCCH order command to the terminal. The cell indicator in the PDCCH order command indicates candidate cell 5. After receiving the PDCCH order command from the source DU, the terminal sends a preamble to candidate DU 5 (i.e., the distributed unit of candidate cell 5) based on the cell indicator indicating candidate cell 5. A RACH collision occurs while the terminal is sending the preamble, causing the preamble to fail. The terminal considers the RACH process in this early TA acquisition process to have failed and records information related to this early TA acquisition failure. Since candidate DU 5 did not receive the preamble sent by the terminal, the source DU does not receive the TA value and related information sent by candidate DU 5. Therefore, the source DU triggers a second PDCCH order command. If the terminal successfully sends the preamble to candidate cell 5 this time, the terminal records information related to this early TA acquisition success.

[0267] The early TA acquisition failure related information includes but is not limited to at least one of the following: RACH resource information, candidate target cell information, time information, and auxiliary information.

[0268] RACH resource information includes but is not limited to at least one of the following:

[0269] Preamble index: In this embodiment, the terminal extracts the preamble index value from the PDCCH order.

[0270] Uplink / supplementary uplink indication information (UL / SUL indicator): In this embodiment, the terminal extracts the UL / SUL indicator value from the PDCCH order.

[0271] Synchronization signal or physical broadcast channel index (SS / PBCH index). In this embodiment, the terminal extracts the SS / PBCH index value from the PDCCH order.

[0272] Physical Random Access Channel Mask Index (PRACH Mask Index): In this embodiment, the terminal extracts the PRACH Mask Index value from the PDCCH order.

[0273] In this embodiment, the terminal extracts the n-TimingAdvanceOffset value from the early TA configuration information of the candidate cell 5 in the LTM configuration information.

[0274] Physical random access channel root sequence index (prach-RootSequenceIndex): In this embodiment, the terminal extracts the prach-RootSequenceIndex value from the early TA configuration information of candidate cell 5 in the LTM configuration information.

[0275] Number of synchronization signal blocks per physical random access channel opportunity (ssb-PerRACH-Occasion) In this embodiment, the terminal extracts the ssb-PerRACH-Occasion value from the early TA configuration information of candidate cell 5 in the LTM configuration information.

[0276] LTM physical random access channel subcarrier spacing (ltm-prach-SubcarrierSpacing): In this embodiment, the terminal extracts the ltm-prach-SubcarrierSpacing value from the early TA configuration information of candidate cell 5 in the LTM configuration information.

[0277] The candidate target cell information includes, but is not limited to, candidate target cell identification information for the early TA acquisition process. In this embodiment, the terminal may extract candidate cell indication information (Cell indicator) from the PDCCH order command as the candidate target cell identification information for the early TA acquisition process, or the terminal may record the physical cell ID (PCI) and frequency information of the candidate target cell, or the terminal may record the global cell identifier (CGI) information of the candidate target cell.

[0278] Time information includes but is not limited to at least one of the following:

[0279] The absolute and / or relative time when the terminal sends the preamble.

[0280] For a candidate cell, the time interval from the last preamble transmission to the next preamble transmission. In this embodiment, for candidate cell 5, the time interval from the last preamble transmission to the next preamble transmission is recorded.

[0281] Auxiliary information includes but is not limited to at least one of the following:

[0282] The RACH type is early TA acquisition or early RACH indication information. In this embodiment, the RACH type is used to indicate to the network that this RACH process is for early TA acquisition. In some embodiments, the RACH type can be explicit or implicit information.

[0283] Indication information of RACH collision occurrence: In this embodiment, the indication information is used to indicate that a RACH collision occurs in this RACH process.

[0284] Information about the type of RACH that collided: In this embodiment, the type of RACH that collided is requesting PUCCH resources for a Scheduling Request (SR).

[0285] Indication information of success or failure of early TA acquisition. In this embodiment, the indication information is used to indicate that the early TA acquisition process has failed.

[0286] Indication information of preamble sending failure. In this embodiment, the indication information is used to indicate that the preamble sending failed.

[0287] The reason value for the preamble not being sent successfully. In this embodiment, the reason value is RACH collision.

[0288] The preamble power ramping counter value (PREAMBLE_POWER_RAMPING_COUNTER) is set to 1 in this embodiment.

[0289] Preamble power ramping step number (PREAMBLE_POWER_RAMPING_STEP) value: In this embodiment, the terminal extracts the powerRampingStep value from the early TA configuration information of candidate cell 5 in the LTM configuration information as the preamble power ramping step value.

[0290] Indication information of whether it is a preamble retransmission. In this embodiment, the indication information is used to indicate that the current preamble transmission is not a preamble retransmission.

[0291] It should be noted that the information related to the early TA acquisition failure can be recorded in an entry as a record of a RACH process. In some embodiments, some information can be recorded outside the entry as common information for all entries, such as RACH type information.

[0292] Scenario 3:

[0293] If the network wishes to obtain the TA value between the terminal and candidate cell 2, the source DU sends a PDCCH order command to the terminal. The cell indicator in the PDCCH order command indicates candidate cell 2. After receiving the PDCCH order command from the source DU, the terminal sends a preamble to candidate DU 2 (i.e., the distributed unit of candidate cell 2) based on the cell indicator indicating candidate cell 2. After successfully sending the preamble, the terminal considers the RACH process in this early TA acquisition process successful and records the relevant information about this early TA acquisition success. After receiving the preamble sent by the terminal, candidate DU 2 sends the TA value and related information to the source DU. The source DU maintains the TA value and related information for use when the source DU sends the LTM cell switch command. Upon receiving the LTM cell switch command sent by the source DU, the terminal extracts the TA value of candidate cell 2 from the LTM cell switch command and performs a RACH-less cell change to access candidate cell 2.

[0294] In this embodiment, during the process of performing a RACH-less cell change, the terminal may further record the following information as candidate target cell information:

[0295] Candidate target cell identification information for LTM cell switch. In this embodiment, the terminal receives an LTM cell switch command and extracts configuration identification information from the LTM cell switch command as candidate target cell identification information for the LTM cellswitch. The terminal may record the physical cell ID (PCI) and frequency information of the candidate target cell, or the terminal may record the global cell identifier (CGI) information of the candidate target cell.

[0296] The target cell of the most recent LTM execution. In this embodiment, the target cell is candidate cell2.

[0297] The TA value of the most recent LTM execution. In this embodiment, the TA value is the TA value of candidate cell 2 carried in the LTM cell switch command.

[0298] Indication information of whether the most recent LTM execution of RACH-less is successful. In this embodiment, the most recent LTM execution of RACH-less is successful.

[0299] Number of early TA acquisition attempts for candidate target cells.

[0300] Indication information indicating whether it is the last selected target candidate cell.

[0301] It should be noted that if the candidate target cell information adopts Figure 2 If the candidate target cell information is recorded in the manner shown, it is only necessary to record the candidate target cell information in the entry of the most recent record when each LTM cell switch command is received. Figure 3 If the recording is performed in the manner shown, then if the reception of the LTM cell switch command is the end, it means that when the LTM cell switch command is received, the terminal should record the candidate target cell information in the outer layer (i.e., a separate) entry of the RACH report or in the entry obtained in the most recent early TA (the entry is the entry in the list of the first relevant information, and the list is recorded in an entry in the RACH report). If the candidate target cell information adopts Figure 3If the recording is performed in the manner shown, then if the reception of LTM configuration release is regarded as the end, it means that when LTM configuration release is received, the terminal should record the candidate target cell information in the outer layer (i.e., a separate) entry of the RACH report, or record the candidate target cell information in the entry of the most recent early TA acquisition, or record the candidate target cell information in the entry of the most recent early TA acquisition before the most recent LTM execution, or the terminal records the candidate target cell information in the entry of the most recent early TA acquisition each time the LTM cell switch command is received, or the terminal records a list including multiple sets of candidate target cell information in the outer layer (i.e., a separate) entry of the RACH report, or the terminal records a list including multiple sets of candidate target cell information in the entry of the most recent early TA acquisition when receiving LTM configuration release. However, the present invention is not limited thereto. The above-mentioned LTM configuration release may also be an early TA acquisition configuration release.

[0302] In this embodiment, during the process of performing the RACH-less cell change, the terminal may further record the following information as time information:

[0303] The interval from the last early TA acquisition to the receipt of the LTM cell switch command. In this embodiment, this interval can be the interval from the most recent TA acquisition of a non-candidate target cell or the most recent TA acquisition of a candidate target cell to the receipt of the LTM cell switch command. For example, this interval is the interval from the terminal successfully sending the preamble to candidate cell DU 2 to the terminal receiving the LTM cell switch command sent by the source DU. The units of this interval can be milliseconds, seconds, minutes, etc.

[0304] It should be noted that if the time information is Figure 2 The time information is recorded in the most recent entry of the non-candidate target cell or candidate target cell before receiving the LTM cellswitch command. Figure 3 If the recording is done in the manner shown, then if the LTM cell switch command is received, the time information is recorded in the entry of the most recent early TA acquisition of the non-candidate target cell or candidate target cell before the LTM cell switch command is received, or in the outer layer (i.e., a separate) entry of the RACH report. Figure 3 If recording is performed in the manner shown, then if the end is the receipt of the LTM configuration release, the time information is recorded in the entry of the most recent early TA acquisition before the most recent LTM cell switch command is received before the LTM configuration release, or the time information is recorded in the entry of the most recent early TA acquisition before the LTM configuration release (the most recent early TA acquisition refers to the last early TA acquisition before the most recent LTM cell switch command is received), or the time information is recorded in an outer layer (i.e., a separate) entry in the RACH report, or the time information is recorded in the entry of the most recent early TA acquisition before each receipt of the LTM cell switch command, or the time information is recorded in the entry of the most recent early TA acquisition before the LTM configuration release (the most recent early TA acquisition refers to the last early TA acquisition before each receipt of the LTM cell switch command, so the most recent early TA acquisition can be a list), or a list is recorded in an outer layer (i.e., a separate) entry in the RACH report to include multiple sets of time information. However, the present invention is not limited thereto. The above-mentioned LTM configuration release may also be an early TA acquisition configuration release.

[0305] In scenario three, regardless of the Figure 2 Record in the form of Figure 3 The auxiliary information recorded by the terminal may be recorded in each entry obtained by early TA, but is not limited thereto.

[0306] Example 2

[0307] The terminal may record the first relevant information in the early TA acquisition process for each candidate cell (Per candidate). The specific description is as follows:

[0308] The specific solution is the same as that in Example 1. The difference from Example 1 is the recording method. The example in Example 1 is used to illustrate the difference in the recording method.

[0309] Due to different recording methods, the recorded content may vary. For a per candidate, recording the first relevant information in the early TA acquisition process may include one or more of the following contents in addition to one or more of the contents recorded in Example 1:

[0310] The candidate target cell information also includes at least one of the following:

[0311] Indication information indicating whether it is the last selected target candidate cell.

[0312] Number of early TA acquisitions of the candidate target cell. In this embodiment, if multiple early TA acquisition processes are performed for a candidate cell during the LTM configuration process or during the LTM early TA acquisition configuration process, the number of times is recorded. This number information can be recorded in an explicit or implicit manner; the explicit manner is that the terminal displays the recorded number information, and the implicit manner is that it can be implicitly indicated by, for example, the number of entries in a list. In embodiment 1, for the case where the LTM configuration release is the end in method 2, the number of times information can also be implicitly indicated by the number of entries. This number information can include the total number of successes or failures, or can include the number of successes and failures separately.

[0313] The time information also includes at least one of the following:

[0314] The absolute and / or relative time when the terminal sends the preamble. In this embodiment, the terminal may record the absolute and / or relative time when the terminal sends the preamble during each early TA acquisition process, where the relative time may be relative to the time when the terminal receives the LTM configuration or LTM early TA acquisition configuration information.

[0315] For a candidate cell, the time interval from the last preamble transmission to the next preamble transmission. The unit of this time interval can be milliseconds, seconds, minutes, etc.

[0316] The recording method of embodiment 2 can be adopted Figures 4 to 7 Any of the recording methods shown will not be described in detail.

[0317] It should be noted that the above embodiments are all illustrated by taking the RACH report as an example. In fact, the RACH-related information recorded in the early TA acquisition process can also be recorded in a non-RACH report, such as an existing report, such as a radio link failure report (RLF report), a connection establishment failure report (CEF report), etc.; or recorded in a custom report, which is not limited at this time.

[0318] In step 102, the terminal sends first relevant information to the network device.

[0319] In this embodiment, the network device is, for example, a source distributed unit (DU), a centralized unit (CU), a candidate distributed unit (DU), or a gNB. The first relevant information is used by the network device to optimize early TA acquisition. That is, the network device optimizes early TA acquisition based on the first relevant information reported by the terminal during the early TA acquisition process. Compared to the prior art, in which the network device is unable to optimize the early TA acquisition process, this embodiment enables the network device to optimize the early TA acquisition based on the first relevant information during the early TA acquisition process, thereby improving early TA acquisition performance.

[0320] In some embodiments, in step 102, the terminal sends the first relevant information to the network device in one of the following three ways:

[0321] Method 1: The terminal sends an indication message to the network device, where the indication message is used to indicate that the network device can obtain the first relevant information from the terminal, that is, to indicate that the terminal has recorded the first relevant information; the terminal responds to the first relevant information request message sent by the network device and sends the first relevant information to the network device.

[0322] The indication information may be carried in one or more of an RRC reconfiguration complete message, an RRC connection establishment complete message, an RRC connection recovery complete message, and an RRC connection reestablishment complete message. The indication information occupies a notification bit of 1 in the message, and a notification bit of 1 indicates that the terminal has recorded the first relevant information. In some embodiments, the indication information may be carried in a custom message, that is, the indication information is not sent using an existing message.

[0323] It can be seen that in method 1, the terminal actively notifies the network device that the terminal has recorded the first relevant information. After receiving the indication information, the network device can send a first relevant information request message to the terminal. After receiving the first relevant information request message, the terminal sends the first relevant information to the network device.

[0324] Method 2: After recording the first relevant information, the terminal sends the first relevant information to the network device.

[0325] As can be seen, in the second method, the terminal no longer notifies the network device, but instead directly sends the first relevant information to the network device after recording the first relevant information. The terminal does not need to send indication information to the network device, and the network device does not need to send a request message to the terminal, thereby reducing signaling interaction and overhead.

[0326] Mode three: the terminal receives the first related information request message sent by the network device; the terminal responds to the first related information request message sent by the network device and sends the first related information to the network device.

[0327] It can be seen that in method three, the terminal no longer has any active operations (including actively sending indication information and actively sending first related information), but passively responds to the request message of the network device. Specifically, only when the terminal receives the first related information request message sent by the network device, the terminal responds to the first related information request message and sends the first related information to the network device.

[0328] It should be noted that in method three, since the terminal does not send indication information to the network device, when the network device sends the first related information request message to the terminal, it does not know whether the terminal has recorded the first related information. Therefore, when the network device sends the first related information request message, the terminal may not have recorded the first related information. Even if the terminal receives the first related information request message, it has no first related information to feedback to the network device.

[0329] Those skilled in the art can configure the terminal to execute one of the above three methods according to actual needs.

[0330] The present disclosure provides another method for optimizing early timing advance acquisition, which is applied to a network device. The network device may be, for example, a source distributed unit (DU), a centralized unit (CU), a candidate distributed unit (DU), or a gNB. The method may include, but is not limited to, the following steps:

[0331] The network device receives the first relevant information sent by the terminal and / or the second relevant information recorded by the network device during the early TA acquisition process, wherein the first relevant information is the first relevant information recorded by the terminal during the early TA acquisition process.

[0332] The first relevant information and / or the second relevant information are used by the network device to optimize early TA acquisition. Compared with the prior art, in which the network device is unable to optimize the early TA acquisition process, this embodiment enables the network device to optimize the early TA acquisition for the first relevant information and / or the second relevant information in the early TA acquisition process, thereby improving the performance of early TA acquisition.

[0333] In some embodiments, the network device may receive the first relevant information sent by the terminal in one of the following three ways:

[0334] Method 1: The network device receives indication information sent by the terminal, where the indication information is used to indicate that the terminal has recorded the first relevant information; the network device sends a first relevant information request message to the terminal; the network device receives the first relevant information sent by the terminal in response to the first relevant information request message.

[0335] It can be seen that in method 1, after receiving the indication information, the network device can know that the terminal has recorded the first relevant information, and then the network device can send a first relevant information request message to the terminal to receive the first relevant information sent by the terminal in response to the first relevant information request message.

[0336] Method 2: The network device sends a first related information request message to the terminal; the network device receives the first related information sent by the terminal in response to the first related information request message.

[0337] It can be seen that in method 2, since the terminal does not send indication information to the network device, when the network device sends the first related information request message to the terminal, it does not know whether the terminal has recorded the first related information. Therefore, when the network device sends the first related information request message, the terminal may not have recorded the first related information. Even if the terminal receives the first related information request message, it has no first related information to feedback to the network device.

[0338] Method three: the network device passively receives the first relevant information sent by the terminal.

[0339] It can be seen that in the third method, the network device no longer actively sends the first related information request message to the terminal, but passively receives the first related information sent by the terminal.

[0340] Those skilled in the art can configure the network device to execute one of the above three methods according to actual needs.

[0341] In some embodiments, the second relevant information includes at least one of the first relevant information and / or at least one of the following information:

[0342] Radio Access Network Temporary Identifier (RA-RNTI)

[0343] Timing Advance (TA) value: In this embodiment, the TA value is a TA value associated with a candidate cell derived by the candidate DU based on the preamble sent by the terminal.

[0344] Source distributed unit (Source DU) identification information: In this embodiment, the Source DU is the source DU that sends the PDCCH order command to trigger the early TA acquisition process, and the Source DU identification information may be a source DU ID, etc.

[0345] Candidate distributed unit (Candidate DU) identification information: In this embodiment, the Candidate DU is the Candidate DU of the preamble sent by the receiving terminal in a certain early TA acquisition process, and the Candidate DU identification information may be a Candidate DU ID, etc.

[0346] This PDCCH order command sends indication information of whether a preamble value sent by the terminal is received.

[0347] The number of times the early TA acquisition process is triggered for each candidate cell. This number can be expressed in an explicit or implicit manner.

[0348] The absolute time or relative time of sending the PDCCH order command. The relative time can be relative to the time of sending the LTM configuration information.

[0349] It should be noted that one or more of the above information may be recorded for each early TA acquisition process in the "number of times the early TA acquisition process is triggered for each candidate cell." For example, a list may be provided for each candidate cell, with each entry in the list containing RACH-related information for each early TA acquisition process for that candidate cell. This entry may also include count information, i.e., the number of times early TA acquisition is triggered for that candidate cell. Alternatively, a list may be provided for all candidate cells, with each entry in the list containing information related to each early TA acquisition process, and this early TA acquisition process may be for any candidate cell. The recording and maintenance of the above information may be performed by the source DU, candidate DU, or CU.

[0350] In some embodiments, the early timing advance acquisition optimization method further includes the following steps:

[0351] The network device performs early TA acquisition optimization based on the first relevant information and / or the second relevant information; or, the network device sends the first relevant information and / or the second relevant information to the network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or the second relevant information.

[0352] The interface signaling may be one or more of Xn, X2, E1, F1, etc. The specific optimization algorithm belongs to the network implementation and will not be described here.

[0353] It should be noted that the optimization of early TA acquisition performed by the network device based on the first relevant information and / or the second relevant information may include the following three situations:

[0354] Case 1: The network device optimizes early TA acquisition based only on the first relevant information reported by the terminal.

[0355] Case 2: The network device optimizes early TA acquisition based only on the second related information recorded by itself.

[0356] Case 3: The network device optimizes early TA acquisition based on the first relevant information reported by the terminal and the second relevant information recorded by the network device.

[0357] Regarding the above situation 3, it should be noted that the first relevant information reported by the terminal and the second relevant information recorded by the network device need to be associated, so that the associated information can be used to find or determine the corresponding first relevant information and second relevant information and perform early TA acquisition optimization. The association method can be one or more of the following: association using the same identification information, which can be sent by the network device to the terminal and included in the report reported by the terminal; or association using the C-RNTI of the source cell.

[0358] It should be noted that if the second relevant information includes at least one information in the first relevant information, it means that the network device records part or all of the content in the first relevant information by itself (ie, not reported from the terminal).

[0359] It should be noted that for the aforementioned method embodiments, for simplicity of description, they are all expressed as a series of action combinations, but those skilled in the art will understand that the embodiments of the present disclosure are not limited by the order of the actions described, because according to the embodiments of the present disclosure, certain steps can be performed in other orders or simultaneously. In addition, those skilled in the art will understand that the embodiments described in the specification are all optional embodiments.

[0360] Figure 8A This is a schematic diagram of an early timing advance acquisition optimization device provided by an embodiment of the present disclosure. The early timing advance acquisition optimization device is applied to a terminal, and the terminal stores the mobility LTM configuration information triggered by layer 1 / layer 2. Figure 8A As shown, the early timing advance acquisition optimization device includes but is not limited to: a recording unit 81 and a sending unit 82, which are specifically described as follows:

[0361] A recording unit 81 is configured to record first relevant information in an early TA acquisition process;

[0362] The sending unit 82 is configured to send the first relevant information to the network device.

[0363] In some embodiments, the first relevant information includes at least one of the following:

[0364] Random access channel RACH resource information;

[0365] Candidate target cell information;

[0366] Time information;

[0367] Auxiliary information.

[0368] In some embodiments, the RACH resource information includes at least one of the following:

[0369] Preamble index preamble index;

[0370] Uplink / supplementary uplink indication information UL / SUL indicator;

[0371] Synchronization signal or physical broadcast channel index SS / PBCH index;

[0372] Physical random access channel mask index PRACH Mask index;

[0373] The timing advance offset n-TimingAdvanceOffset applied to all uplink transmissions on the candidate cell;

[0374] Physical random access channel root sequence index prach-RootSequenceIndex;

[0375] Number of synchronization signal blocks per physical random access channel opportunity ssb-PerRACH-Occasion;

[0376] LTM physical random access channel subcarrier spacing ltm-prach-SubcarrierSpacing.

[0377] In some embodiments, the candidate target cell information includes at least one of the following:

[0378] Candidate target cell identification information during the early TA acquisition process;

[0379] Candidate target cell identification information for LTM cell change;

[0380] The target cell of the most recent LTM execution;

[0381] The TA value of the most recent LTM execution;

[0382] Indication of whether the most recent LTM execution of RACH-less was successful;

[0383] Number of early TA acquisitions of candidate target cells;

[0384] Indication information indicating whether it is the last selected target candidate cell.

[0385] In some embodiments, the time information includes at least one of the following:

[0386] The absolute and / or relative time at which the terminal sends the preamble;

[0387] The time interval from the last early TA acquisition to the receipt of the LTM cell change command;

[0388] For a candidate cell, the time interval from the last preamble code transmission to the next preamble code transmission.

[0389] In some embodiments, the auxiliary information includes at least one of the following:

[0390] Indication information indicating that the RACH type is early TA acquisition or early RACH;

[0391] Indication information of RACH collision;

[0392] The type of RACH that collided;

[0393] Early TA obtains an indication of success or failure;

[0394] Indication of failure in sending the preamble;

[0395] Preamble power ramp-up counter value;

[0396] Number of preamble power ramp-up steps;

[0397] Indication information of whether the preamble is retransmitted;

[0398] The reason value for the preamble not being sent successfully.

[0399] In some embodiments, the recording unit 81 is configured to record the first relevant information during the early TA acquisition process in a report, wherein the report includes at least one of the following:

[0400] RACH report;

[0401] Custom reports;

[0402] Non-RACH reporting.

[0403] In some embodiments, the sending unit 82 is configured to:

[0404] Sending instruction information to the network device, where the instruction information is used to instruct the network device to obtain first relevant information from the terminal; and sending the first relevant information to the network device in response to the first relevant information request message sent by the network device;

[0405] Or, after recording the first relevant information, the recording unit 81 sends the first relevant information to the network device;

[0406] Or, receiving a first related information request message sent by the network device; and sending the first related information to the network device in response to the first related information request message sent by the network device.

[0407] In some embodiments, the first relevant information includes at least one of the following:

[0408] Early TA obtains success-related information;

[0409] Early TA failed to obtain relevant information.

[0410] In some embodiments, the recording unit 81 is configured to record the first relevant information for each RACH process and / or each candidate cell.

[0411] Figure 8A For details of the various embodiments of the early timing advance acquisition optimization device shown, please refer to Figure 1 To avoid repetition, the various embodiments of the early timing advance acquisition optimization method shown are not described again.

[0412] Figure 8B This is a schematic diagram of another early timing advance acquisition optimization device provided by an embodiment of the present disclosure. The early timing advance acquisition optimization device is applied to a network device. The early timing advance acquisition optimization device includes but is not limited to:

[0413] The receiving unit 81 is configured to receive first related information sent by a terminal and / or record second related information in the early TA acquisition process, wherein the first related information is the first related information in the early TA acquisition process recorded by the terminal.

[0414] In some embodiments, the early timing advance acquisition optimization apparatus further includes an optimization unit configured to:

[0415] Perform early TA acquisition optimization based on the first relevant information and / or the second relevant information; or, send the first relevant information and / or the second relevant information to a network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or the second relevant information.

[0416] In some embodiments, the second relevant information includes at least one of the first relevant information and / or at least one of the following information:

[0417] Random access radio network temporary identifier RA-RNTI;

[0418] Timing Advance TA value;

[0419] Source distributed unit Source DU identification information;

[0420] Candidate distributed unit Candidate DU identification information;

[0421] This PDCCH order command indicates whether the preamble value sent by the terminal has been received;

[0422] The number of times the early TA acquisition process is triggered for each candidate cell;

[0423] The absolute or relative time when the PDCCH order command is sent.

[0424] The present disclosure also provides a processor-readable storage medium, wherein the processor-readable storage medium stores a program for causing a processor to execute the steps of each embodiment of the early timing advance acquisition optimization method. The processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as a floppy disk, hard disk, magnetic tape, magneto-optical disk (MO), etc.), optical storage (such as CD, DVD, BD, HVD, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drive (SSD)), etc.

[0425] Figure 9A schematic diagram of a communication device provided in an embodiment of the present disclosure is shown in FIG. Figure 9 As shown, the communication device provided by the embodiment of the present disclosure includes a memory 901, a transceiver 902, and a processor 903:

[0426] The memory 901 is used to store computer programs; the transceiver 902 is used to send and receive data under the control of the processor 903; the processor 903 is used to read the computer program in the memory 901 and execute:

[0427] If the layer 1 / layer 2 triggered mobility LTM configuration information is stored, the first relevant information in the early TA acquisition process is recorded;

[0428] The first relevant information is sent to the network device.

[0429] In some embodiments, the first relevant information includes at least one of the following:

[0430] Random access channel RACH resource information;

[0431] Candidate target cell information;

[0432] Time information;

[0433] Auxiliary information.

[0434] In some embodiments, the RACH resource information includes at least one of the following:

[0435] Preamble index preamble index;

[0436] Uplink / supplementary uplink indication information UL / SUL indicator;

[0437] Synchronization signal or physical broadcast channel index SS / PBCH index;

[0438] Physical random access channel mask index PRACH Mask index;

[0439] The timing advance offset n-TimingAdvanceOffset applied to all uplink transmissions on the candidate cell;

[0440] Physical random access channel root sequence index prach-RootSequenceIndex;

[0441] Number of synchronization signal blocks per physical random access channel opportunity ssb-PerRACH-Occasion;

[0442] LTM physical random access channel subcarrier spacing ltm-prach-SubcarrierSpacing.

[0443] In some embodiments, the candidate target cell information includes at least one of the following:

[0444] Candidate target cell identification information during the early TA acquisition process;

[0445] Candidate target cell identification information for LTM cell change;

[0446] The target cell of the most recent LTM execution;

[0447] The TA value of the most recent LTM execution;

[0448] Indication of whether the most recent LTM execution of RACH-less was successful;

[0449] Number of early TA acquisitions of candidate target cells;

[0450] Indication information indicating whether it is the last selected target candidate cell.

[0451] In some embodiments, the time information includes at least one of the following:

[0452] The absolute and / or relative time at which the preamble was sent;

[0453] The time interval from the last early TA acquisition to the receipt of the LTM cell change command;

[0454] For a candidate cell, the time interval from the last preamble code transmission to the next preamble code transmission.

[0455] In some embodiments, the auxiliary information includes at least one of the following:

[0456] Indication information indicating that the RACH type is early TA acquisition or early RACH;

[0457] Indication information of RACH collision;

[0458] Information on the type of RACH that collided;

[0459] Early TA obtains an indication of success or failure;

[0460] Indication of failure in sending the preamble;

[0461] Preamble power ramp-up counter value;

[0462] Number of preamble power ramp-up steps;

[0463] Indication information of whether the preamble is retransmitted;

[0464] The reason value for the preamble not being sent successfully.

[0465] In some embodiments, recording first relevant information during the early TA acquisition process includes:

[0466] The first relevant information in the early TA acquisition process is recorded in a report, where the report includes at least one of the following:

[0467] RACH report;

[0468] Custom reports;

[0469] Non-RACH reporting.

[0470] In some embodiments, sending the first relevant information to the network device includes:

[0471] Sending instruction information to the network device, where the instruction information is used to instruct the network device to obtain the first relevant information; and sending the first relevant information to the network device in response to the first relevant information request message sent by the network device;

[0472] Or, after recording the first relevant information, send the first relevant information to the network device;

[0473] Or, receiving a first related information request message sent by the network device; and sending the first related information to the network device in response to the first related information request message sent by the network device.

[0474] In some embodiments, the first relevant information includes at least one of the following:

[0475] Early TA obtains success-related information;

[0476] Early TA failed to obtain relevant information.

[0477] In some embodiments, recording first relevant information during the early TA acquisition process includes:

[0478] The first relevant information is recorded for each RACH process and / or each candidate cell.

[0479] Figure 9In the embodiment, the transceiver 902 is used to receive and send data under the control of the processor 903. The bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by the processor 903 and the memory represented by the memory 901. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 902 can be a plurality of components, that is, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. The processor 903 is responsible for managing the bus architecture and general processing, and the memory 901 can store data used by the processor 903 when performing operations.

[0480] Figure 9 In the embodiment, the processor 903 can 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 processor 903 or software instructions. The processor 903 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor.

[0481] Figure 10 A schematic diagram of another communication device provided in an embodiment of the present disclosure, such as Figure 10 As shown, the communication device provided by the embodiment of the present disclosure includes a memory 1001, a transceiver 1002, and a processor 1003:

[0482] The memory 1001 is used to store computer programs; the transceiver 1002 is used to send and receive data under the control of the processor 1003; the processor 1003 is used to read the computer program in the memory 1001 and execute:

[0483] The first relevant information sent by the terminal is received and / or the second relevant information in the early TA acquisition process is recorded, wherein the first relevant information is the first relevant information in the early TA acquisition process recorded by the terminal.

[0484] In some embodiments, the second relevant information includes at least one of the first relevant information and / or at least one of the following information:

[0485] Random access radio network temporary identifier RA-RNTI;

[0486] Timing Advance TA value;

[0487] Source distributed unit Source DU identification information;

[0488] Candidate distributed unit Candidate DU identification information;

[0489] This PDCCH order command indicates whether the preamble value sent by the terminal has been received;

[0490] The number of times the early TA acquisition process is triggered for each candidate cell;

[0491] The absolute or relative time when the PDCCH order command is sent.

[0492] In some embodiments, the processor 1003 is further configured to:

[0493] performing early TA acquisition optimization based on the first relevant information and / or the second relevant information;

[0494] or,

[0495] The first relevant information and / or the second relevant information are sent to a network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or the second relevant information.

[0496] Figure 10 In the embodiment, the transceiver 1002 is used to receive and send data under the control of the processor 1003. The bus architecture can include any number of interconnected buses and bridges, specifically linking various circuits of one or more processors represented by the processor 1003 and the memory represented by the memory 1001. The bus architecture can also link various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are all well known in the art and therefore will not be described further herein. The bus interface provides an interface. The transceiver 1002 can be multiple components, that is, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. The processor 1003 is responsible for managing the bus architecture and general processing, and the memory 1001 can store data used by the processor 1003 when performing operations.

[0497] Figure 10 In the embodiment, the processor 1003 can 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 processor 1003 or software instructions. The processor 1003 can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. The general-purpose processor can be a microprocessor or any conventional processor.

[0498] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises..." does not exclude the presence of other identical elements in the process, method, article, or apparatus comprising the element.

[0499] Those skilled in the art will appreciate that although some embodiments described herein include certain features and not others included in other embodiments, the combination of features from different embodiments is intended to be within the scope of this disclosure and to form different embodiments.

[0500] Those skilled in the art will understand that the description of each embodiment has its own focus, and for parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0501] Although the embodiments of the present disclosure have been described with reference to the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A method for optimizing early timing advance acquisition, applied to a terminal, comprising: If the terminal stores the layer 1 / layer 2 triggered mobility LTM configuration information, the terminal records the first relevant information in the early TA acquisition process; The terminal sends the first relevant information to the network device.

2. The method according to claim 1, wherein The first relevant information includes at least one of the following: Random access channel RACH resource information; Candidate target cell information; Time information; Auxiliary information.

3. The method according to claim 2, wherein: The RACH resource information includes at least one of the following: Preamble index; Uplink / supplemental uplink indication information; Synchronization signal or physical broadcast channel index; Physical random access channel mask index; The timing advance offset to be applied to all uplink transmissions on the candidate cell; Physical random access channel root sequence index; The number of synchronization signal blocks per random access channel opportunity; LTM physical random access channel subcarrier spacing.

4. The method according to claim 2, wherein: The candidate target cell information includes at least one of the following: Candidate target cell identification information during the early TA acquisition process; Candidate target cell identification information for LTM cell change; The target cell of the most recent LTM execution; The TA value of the most recent LTM execution; Indication of whether the most recent LTM execution of RACH-less was successful; Number of early TA acquisitions of candidate target cells; Indication information indicating whether it is the last selected target candidate cell.

5. The method according to claim 2, wherein: The time information includes at least one of the following: The absolute and / or relative time at which the terminal sends the preamble; The time interval from the last early TA acquisition to the receipt of the LTM cell change command; For a candidate cell, the time interval from the last preamble code transmission to the next preamble code transmission.

6. The method according to claim 2, wherein: The auxiliary information includes at least one of the following: Indication information indicating that the RACH type is early TA acquisition or early RACH; Indication information of RACH collision; Information on the type of RACH that collided; Early TA obtains an indication of success or failure; Indication of failure in sending the preamble; Preamble power ramp counter value; Number of preamble power ramp-up steps; Indication information of whether the preamble is retransmitted; The reason value for the preamble not being sent successfully.

7. The method according to claim 1, wherein The terminal records first relevant information in the early TA acquisition process, including: The terminal records first relevant information in the early TA acquisition process in a report, wherein the report includes at least one of the following: RACH report; Custom reports; Non-RACH reporting.

8. The method according to claim 1, wherein The terminal sending the first relevant information to the network device includes: The terminal sends indication information to the network device, where the indication information is used to instruct the network device to obtain first relevant information from the terminal; and the terminal sends the first relevant information to the network device in response to the first relevant information request message sent by the network device; Or, after recording the first relevant information, the terminal sends the first relevant information to the network device; Alternatively, the terminal receives a first related information request message sent by the network device; and in response to the first related information request message sent by the network device, the terminal sends the first related information to the network device.

9. The method according to claim 1, wherein The first relevant information includes at least one of the following: Early TA obtains success-related information; Early TA failed to obtain relevant information.

10. The method according to any one of claims 1 to 9, wherein: The terminal records first relevant information in the early TA acquisition process, including: The terminal records first relevant information for each RACH process and / or each candidate cell.

11. A method for optimizing early timing advance acquisition, applied to a network device, the method comprising: The network device receives first relevant information sent by the terminal and / or second relevant information recorded by the network device during the early TA acquisition process, wherein the first relevant information is the first relevant information recorded by the terminal during the early TA acquisition process.

12. The method according to claim 11, wherein The second relevant information includes at least one of the first relevant information and / or at least one of the following information: Random access radio network temporary identifier RA-RNTI; Timing Advance TA value; Source distributed unit Source DU identification information; Candidate distributed unit Candidate DU identification information; This PDCCH order command indicates whether the preamble value sent by the terminal has been received; The number of times the early TA acquisition process is triggered for each candidate cell; The absolute or relative time when the PDCCH order command is sent.

13. The method according to claim 11, wherein The method further comprises: The network device performs early TA acquisition optimization based on the first relevant information and / or the second relevant information; or, The network device sends the first relevant information and / or the second relevant information to the network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or second relevant information.

14. A device for optimizing early timing advance acquisition, applied to a terminal storing layer 1 / layer 2 triggered mobility LTM configuration information, the device comprising: A recording unit, configured to record first relevant information in an early TA acquisition process; The sending unit is configured to send the first relevant information to the network device.

15. A device for optimizing early timing advance acquisition, applied to a network device, comprising: The receiving unit is configured to receive first relevant information sent by a terminal and / or record second relevant information in an early TA acquisition process, wherein the first relevant information is the first relevant information in the early TA acquisition process recorded by the terminal.

16. A communication device, wherein: Including memory, transceiver, processor; The memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; and the processor is used to read the computer program in the memory and execute: If the layer 1 / layer 2 triggered mobility LTM configuration information is stored, the first relevant information in the early TA acquisition process is recorded; The first relevant information is sent to the network device.

17. The communication device according to claim 16, wherein: The first relevant information includes at least one of the following: Random access channel RACH resource information; Candidate target cell information; Time information; Auxiliary information.

18. The communication device according to claim 17, wherein: The RACH resource information includes at least one of the following: Preamble index; Uplink / supplemental uplink indication information; Synchronization signal or physical broadcast channel index; Physical random access channel mask index; The timing advance offset to be applied to all uplink transmissions on the candidate cell; Physical random access channel root sequence index; The number of synchronization signal blocks per physical random access channel opportunity; LTM physical random access channel subcarrier spacing.

19. The communication device according to claim 17, wherein: The candidate target cell information includes at least one of the following: Candidate target cell identification information during the early TA acquisition process; Candidate target cell identification information for LTM cell change; The target cell of the most recent LTM execution; The TA value of the most recent LTM execution; Indication of whether the most recent LTM execution of RACH-less was successful; Number of early TA acquisitions of candidate target cells; Indication information indicating whether it is the last selected target candidate cell.

20. The communication device according to claim 17, wherein The time information includes at least one of the following: The absolute and / or relative time at which the preamble was sent; The time interval from the last early TA acquisition to the receipt of the LTM cell handover command; For a candidate cell, the time interval from the last preamble code transmission to the next preamble code transmission.

21. The communication device according to claim 17, wherein The auxiliary information includes at least one of the following: Indication information indicating that the RACH type is early TA acquisition or early RACH; Indication information of RACH collision; Information on the type of RACH that collided; Early TA obtains an indication of success or failure; Indication of failure in sending the preamble; Preamble power ramp counter value; Number of preamble power ramp-up steps; Indication information of whether the preamble is retransmitted; The reason value for the preamble not being sent successfully.

22. The communication device according to claim 16, wherein Records the first relevant information during the early TA acquisition process, including: Recording first relevant information during the early TA acquisition process in a report, wherein the report includes at least one of the following: RACH report; Custom reports; Non-RACH reporting.

23. The communication device according to claim 16, wherein The sending the first relevant information to the network device includes: Sending indication information to a network device, the indication information being used to instruct the network device to obtain first relevant information; and sending the first relevant information to the network device in response to a first relevant information request message sent by the network device; or, after recording the first relevant information, sending the first relevant information to the network device; Or, receiving a first related information request message sent by a network device; and sending the first related information to the network device in response to the first related information request message sent by the network device.

24. The communication device according to claim 16, wherein The first relevant information includes at least one of the following: Early TA obtains success-related information; Early TA failed to obtain relevant information.

25. The communication device according to any one of claims 16 to 24, wherein: Records the first relevant information during the early TA acquisition process, including: The first relevant information is recorded for each RACH process and / or each candidate cell.

26. A communication device, wherein: Including memory, transceiver, processor; The memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; and the processor is used to read the computer program in the memory and execute: The first relevant information sent by the terminal is received and / or the second relevant information in the early TA acquisition process is recorded, wherein the first relevant information is the first relevant information in the early TA acquisition process recorded by the terminal.

27. The communication device according to claim 26, wherein: The second relevant information includes at least one of the first relevant information and / or at least one of the following information: Random access radio network temporary identifier RA-RNTI; Timing Advance TA value; Source distributed unit Source DU identification information; Candidate distributed unit Candidate DU identification information; This PDCCH order command indicates whether the preamble value sent by the terminal has been received; The number of times the early TA acquisition process is triggered for each candidate cell; The absolute or relative time when the PDCCH order command is sent.

28. The communication device according to claim 26, wherein The processor is further configured to: performing early TA acquisition optimization based on the first relevant information and / or the second relevant information; or, The first relevant information and / or the second relevant information are sent to a network device related to the first relevant information and / or the second relevant information through interface signaling, so that the network device performs early TA acquisition optimization based on the received first relevant information and / or the second relevant information.

29. A processor-readable storage medium, wherein: The processor-readable storage medium stores a program, and the program is configured to enable the processor to execute the early timing advance acquisition optimization method according to any one of claims 1 to 10 or the early timing advance acquisition optimization method according to any one of claims 11 to 13.

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