Method and apparatus for acquiring timing advance

Abstract

Provided in the present application are a method and apparatus for acquiring a timing advance. The method in the embodiments of the present application comprises: acquiring a radio resource control (RRC) message, wherein the RRC message comprises configuration information used for acquiring timing advances (TAs) of candidate cells, and the candidate cells are LTM candidate cells; determining a target LTM candidate cell from among the LTM candidate cells, wherein the target LTM candidate cell is a candidate cell for which the TA is about to be acquired in advance; and on the basis of the configuration information, initiating a TA acquisition procedure for the target LTM candidate cell or calculating the TA of the target LTM candidate cell.

Description

Method and device for obtaining timing advance

[0001] This disclosure claims priority to the Chinese patent application filed with the China Patent Office on September 6, 2023, with application number 202311146074.1 and application name “Method and Device for Obtaining Time Advance”, the entire contents of which are incorporated by reference into this disclosure. Technical Field

[0002] The present disclosure relates to the field of communication technology, and in particular to a method and device for obtaining a timing advance. Background Art

[0003] In Release 18 Layer 1 or Layer 2 Triggered Mobility (LTM), the network can trigger the acquisition of the timing advance (TA) of candidate cells based on corresponding measurement results. However, with the introduction of conditional LTM in mobility enhancement technology, handover decisions are made by the user equipment (UE). The network-triggered TA acquisition solution in Release 18 LTM is not applicable in this scenario.

[0004] Summary of the Invention

[0005] The present disclosure aims to provide a method and apparatus for acquiring a timing advance, so as to solve the problem that the TA acquisition solution in the related art is not applicable to the conditional LTM scenario and will cause a large handover interruption delay.

[0006] The present disclosure provides a method for obtaining a timing advance, which is performed by a terminal, and the method includes:

[0007] Obtaining a radio resource control (RRC) message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell;

[0008] Determine a target LTM candidate cell among the LTM candidate cells, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed;

[0009] According to the configuration information, a TA acquisition process of the target LTM candidate cell is initiated or the TA of the target LTM candidate cell is calculated.

[0010] In some embodiments, the configuration information includes at least one of the following:

[0011] Conditional LTM configuration flag;

[0012] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0013] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0014] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0015] Indication of whether to perform terminal-based TA measurement.

[0016] In some embodiments, initiating a TA acquisition process for the target LTM candidate cell according to the configuration information includes:

[0017] sending a target preamble on a target random access channel opportunity;

[0018] The target random access channel opportunity is a random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble is a preamble corresponding to a preamble index used by the target LTM candidate cell for early TA acquisition.

[0019] In some embodiments, after sending the target preamble on the target random access channel opportunity, the method further includes at least one of the following:

[0020] Monitor the random access response (RAR) sent by the target LTM candidate cell;

[0021] Synchronize with the serving cell and monitor RAR;

[0022] After receiving the RAR, resynchronize with the serving cell;

[0023] receiving a first downlink message sent by a serving cell, where the first downlink message includes a TA of a target LTM candidate cell;

[0024] The RAR includes the TA of the target LTM candidate cell.

[0025] In some embodiments, the first downlink message further includes at least one of the following:

[0026] Conditional LTM configuration flag;

[0027] PCI and / or frequency of the target LTM candidate cell.

[0028] In some embodiments, before sending the target preamble code on the target random access channel opportunity, the method further includes:

[0029] Perform downlink synchronization with the target LTM candidate cell.

[0030] In some embodiments, the method of the present disclosure further includes:

[0031] A target message is sent, where the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

[0032] The present disclosure also provides a method for obtaining a timing advance, which is performed by a network-side device. The method includes:

[0033] An RRC message is sent, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell.

[0034] In some embodiments, the configuration information includes at least one of the following:

[0035] Conditional LTM configuration flag;

[0036] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0037] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0038] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0039] Indication of whether to perform terminal-based TA measurement.

[0040] In some embodiments, the method of the present disclosure further includes:

[0041] Get the TA sent by the target LTM candidate cell;

[0042] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0043] In some embodiments, the first downlink message is at least one of the following:

[0044] Random access response RAR;

[0045] Media access layer control unit MAC CE;

[0046] RRC reconfiguration message.

[0047] In some embodiments, the first downlink message further includes at least one of the following:

[0048] Conditional LTM configuration flag;

[0049] PCI and / or frequency of the target LTM candidate cell.

[0050] In some embodiments, the method of the present disclosure further includes:

[0051] A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

[0052] The present disclosure also provides a method for obtaining a timing advance, which is executed by a terminal. The method includes:

[0053] Determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for TA early acquisition;

[0054] A first uplink message is sent, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0055] In some embodiments, the first uplink message includes at least one of the following:

[0056] Conditional LTM configuration flag;

[0057] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0058] Synchronization signal / physical broadcast channel signal block SSB index;

[0059] L1 measurement results corresponding to the LTM candidate cells;

[0060] Channel State Information Reference Signal CSI-RS index;

[0061] Beam related indication information;

[0062] Request to obtain the instruction information of TA.

[0063] In some embodiments, the method of the present disclosure further includes:

[0064] monitoring a PDCCH command sent by the network side device, where the PDCCH command includes a random access channel resource;

[0065] Sending a preamble to a target LTM candidate cell according to the random access channel resources;

[0066] A first downlink message is obtained, where the first downlink message includes a TA of a target LTM candidate cell.

[0067] In some embodiments, the first downlink message further includes at least one of the following:

[0068] Conditional LTM configuration flag;

[0069] PCI and / or frequency of the target LTM candidate cell.

[0070] The present disclosure also provides a method for obtaining a timing advance, which is performed by a network-side device. The method includes:

[0071] Obtaining a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell;

[0072] According to the first uplink message, a TA acquisition process of the target LTM candidate cell is triggered.

[0073] In some embodiments, the first uplink message includes at least one of the following:

[0074] Conditional LTM configuration flag;

[0075] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0076] Synchronization signal / physical broadcast channel signal block SSB index;

[0077] L1 measurement results corresponding to the LTM candidate cells;

[0078] Channel State Information Reference Signal CSI-RS index;

[0079] Beam related indication information;

[0080] Request to obtain the instruction information of TA.

[0081] In some embodiments, triggering a TA acquisition process of the target LTM candidate cell according to the first uplink message includes:

[0082] interacting with a target LTM candidate cell according to the first uplink message to obtain random access channel resources;

[0083] A PDCCH command is sent to the terminal, where the PDCCH command includes random access channel resources.

[0084] In some embodiments, the method further comprises:

[0085] Get the TA sent by the target LTM candidate cell;

[0086] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0087] In some embodiments, the first downlink message further includes at least one of the following:

[0088] Conditional LTM configuration flag;

[0089] PCI and / or frequency of the target LTM candidate cell.

[0090] The embodiment of the present disclosure further provides a timing advance acquisition device, comprising a memory, a transceiver, and a processor;

[0091] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0092] Obtaining a radio resource control (RRC) message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell;

[0093] Determine a target LTM candidate cell among the LTM candidate cells, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed;

[0094] According to the configuration information, a TA acquisition process of the target LTM candidate cell is initiated or the TA of the target LTM candidate cell is calculated.

[0095] In some embodiments, the configuration information includes at least one of the following:

[0096] Conditional LTM configuration flag;

[0097] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0098] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0099] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0100] Indication of whether to perform terminal-based TA measurement.

[0101] In some embodiments, the processor further implements the following steps:

[0102] sending a target preamble on a target random access channel opportunity;

[0103] The target random access channel opportunity is a random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble is a preamble corresponding to a preamble index used by the target LTM candidate cell for early TA acquisition.

[0104] In some embodiments, the processor further implements at least one of the following:

[0105] Monitor the random access response (RAR) sent by the target LTM candidate cell;

[0106] Synchronize with the serving cell and monitor RAR;

[0107] After receiving the RAR, resynchronize with the serving cell;

[0108] receiving a first downlink message sent by a serving cell, where the first downlink message includes a TA of a target LTM candidate cell;

[0109] The RAR includes the TA of the target LTM candidate cell.

[0110] In some embodiments, the first downlink message further includes at least one of the following:

[0111] Conditional LTM configuration flag;

[0112] PCI and / or frequency of the target LTM candidate cell.

[0113] In some embodiments, the processor further implements the following steps:

[0114] Perform downlink synchronization with the target LTM candidate cell.

[0115] In some embodiments, the processor further implements the following steps:

[0116] A target message is sent, where the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

[0117] The embodiment of the present disclosure further provides a timing advance acquisition device, comprising a memory, a transceiver, and a processor;

[0118] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0119] An RRC message is sent, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell.

[0120] In some embodiments, the configuration information includes at least one of the following:

[0121] Conditional LTM configuration flag;

[0122] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0123] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0124] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0125] Indication of whether to perform terminal-based TA measurement.

[0126] In some embodiments, the processor further implements the following steps:

[0127] Get the TA sent by the target LTM candidate cell;

[0128] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0129] In some embodiments, the first downlink message is at least one of the following:

[0130] Random access response RAR;

[0131] Media access layer control unit MAC CE;

[0132] RRC reconfiguration message.

[0133] In some embodiments, the first downlink message further includes at least one of the following:

[0134] Conditional LTM configuration flag;

[0135] PCI and / or frequency of the target LTM candidate cell.

[0136] In some embodiments, the processor further implements the following steps:

[0137] A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

[0138] The embodiment of the present disclosure further provides a timing advance acquisition device, comprising a memory, a transceiver, and a processor;

[0139] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0140] Determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for TA early acquisition;

[0141] A first uplink message is sent, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0142] In some embodiments, the first uplink message includes at least one of the following:

[0143] Conditional LTM configuration flag;

[0144] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0145] Synchronization signal / physical broadcast channel signal block SSB index;

[0146] L1 measurement results corresponding to the LTM candidate cells;

[0147] Channel state information reference signal CSI-RS index;

[0148] Beam related indication information;

[0149] Request to obtain the instruction information of TA.

[0150] In some embodiments, the processor further implements the following steps:

[0151] monitoring a PDCCH command sent by the network side device, where the PDCCH command includes a random access channel resource;

[0152] Sending a preamble to a target LTM candidate cell according to the random access channel resources;

[0153] A first downlink message is obtained, where the first downlink message includes a TA of a target LTM candidate cell.

[0154] In some embodiments, the first downlink message further includes at least one of the following:

[0155] Conditional LTM configuration flag;

[0156] PCI and / or frequency of the target LTM candidate cell.

[0157] The embodiment of the present disclosure further provides a timing advance acquisition device, comprising a memory, a transceiver, and a processor;

[0158] A memory for storing a computer program; a transceiver for transmitting and receiving data under the control of the processor; and a processor for reading the computer program in the memory and performing the following operations:

[0159] Obtaining a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell;

[0160] According to the first uplink message, a TA acquisition process of the target LTM candidate cell is triggered.

[0161] In some embodiments, the first uplink message includes at least one of the following:

[0162] Conditional LTM configuration flag;

[0163] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0164] Synchronization signal / physical broadcast channel signal block SSB index;

[0165] L1 measurement results corresponding to the LTM candidate cells;

[0166] Channel state information reference signal CSI-RS index;

[0167] Beam related indication information;

[0168] Request to obtain the instruction information of TA.

[0169] In some embodiments, the processor further implements the following steps:

[0170] interacting with a target LTM candidate cell according to the first uplink message to obtain random access channel resources;

[0171] A PDCCH command is sent to the terminal, where the PDCCH command includes random access channel resources.

[0172] In some embodiments, the processor further implements the following steps:

[0173] Get the TA sent by the target LTM candidate cell;

[0174] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0175] In some embodiments, the first downlink message further includes at least one of the following:

[0176] Conditional LTM configuration flag;

[0177] PCI and / or frequency of the target LTM candidate cell.

[0178] The present disclosure also provides a device for obtaining a timing advance, including:

[0179] A first acquiring unit is configured to acquire a radio resource control (RRC) message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell;

[0180] A first determining unit is configured to determine a target LTM candidate cell among the LTM candidate cells, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed;

[0181] The first processing unit is configured to initiate a TA acquisition process of the target LTM candidate cell or calculate the TA of the target LTM candidate cell according to the configuration information.

[0182] The present disclosure also provides a device for obtaining a timing advance, including:

[0183] The first sending unit is configured to send an RRC message, where the RRC message includes configuration information for acquiring a timing advance TA of a candidate cell, and the candidate cell is an LTM candidate cell.

[0184] The present disclosure also provides a device for obtaining a timing advance, including:

[0185] A second determining unit is configured to determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed;

[0186] The second sending unit is configured to send a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0187] The present disclosure also provides a device for obtaining a timing advance, including:

[0188] A second acquiring unit is configured to acquire a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell;

[0189] The second processing unit is configured to trigger a TA acquisition process of the target LTM candidate cell according to the first uplink message.

[0190] An embodiment of the present disclosure further provides a processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the steps of the method for obtaining the timing advance as described above.

[0191] The above technical solution disclosed in the present invention has at least the following beneficial effects:

[0192] In the disclosed embodiment, a terminal obtains an RRC message containing configuration information for acquiring the timing advance (TA) of a candidate cell; determines a target LTM candidate cell for TA acquisition among the LTM candidate cells; and initiates a TA acquisition process for the target LTM candidate cell or calculates the TA of the target LTM candidate cell based on the configuration information. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, effectively avoiding interruptions and delay overhead caused by the terminal-initiated random access process, and effectively improving system transmission performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0193] FIG1 is a structural diagram of a network system to which the embodiments of the present disclosure may be applied;

[0194] FIG2 is a flow chart showing one of the methods for obtaining a timing advance according to an embodiment of the present disclosure;

[0195] FIG3 shows a second flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0196] FIG4 is a third flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0197] FIG5 is a fourth flow chart of a method for obtaining a timing advance according to an embodiment of the present disclosure;

[0198] FIG6 shows a structural block diagram of a device for obtaining a timing advance according to an embodiment of the present disclosure;

[0199] FIG7 shows a second structural block diagram of the apparatus for obtaining the timing advance according to an embodiment of the present disclosure;

[0200] FIG8 shows one of the module schematic diagrams of the device for obtaining the timing advance according to an embodiment of the present disclosure;

[0201] FIG9 shows a second module schematic diagram of the device for obtaining the timing advance according to an embodiment of the present disclosure;

[0202] FIG10 shows a third module schematic diagram of the device for obtaining the timing advance according to an embodiment of the present disclosure;

[0203] FIG11 shows a fourth module schematic diagram of the device for obtaining the timing advance according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0204] The following will clearly and completely describe the technical solutions in the embodiments of the present disclosure in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present disclosure without making any creative efforts shall fall within the scope of protection of the present disclosure.

[0205] The terms "first," "second," and the like in the specification and claims of the present disclosure are used to distinguish similar objects and are not necessarily used to describe a particular order or sequential sequence. It should be understood that the terms used in this manner are interchangeable where appropriate so that the embodiments of the present disclosure described herein may be implemented in a sequence other than those illustrated or described herein. In addition, the terms "including" and "having," and any variations thereof, are intended to cover non-exclusive inclusions, e.g., a process, method, system, product, or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such processes, methods, products, or apparatus.

[0206] In the embodiments of the present disclosure, the term "and / or" describes the relationship between associated objects, indicating that three possible relationships exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship. In the embodiments of the present disclosure, the term "plurality" refers to two or more, and other quantifiers are similar.

[0207] In the embodiments of the present disclosure, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present disclosure should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0208] Figure 1 shows a block diagram of a wireless communication system to which the embodiments of the present disclosure can be applied. The wireless communication system includes a terminal device 11 and a network-side device (or network device) 12. The terminal device 11 may also be referred to as a terminal or a user equipment (UE). It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present disclosure. The network-side device 12 may be a base station or a core network. It should be noted that in the embodiments of the present disclosure, only a base station in the NR system is used as an example, but the specific type of the base station is not limited.

[0209] In order to enable those skilled in the art to better understand the embodiments of the present disclosure, the following description is first given.

[0210] (1)R18 LTM;

[0211] R18 supports a cell change mechanism based on L1L2 commands. The cell change mechanism based on L1L2 commands aims to achieve a faster process than that based on L3 commands. At the same time, the cell change mechanism based on L1L2 commands is not limited to handover and primary and secondary cell (PSCell) changes, but can also be applied to secondary cells (SCells). To support mobility based on L1L2 commands, the serving cell pre-configures the configuration information of candidate cells to the UE through Radio Resource Control (RRC) messages. The UE performs L1 measurements on neighboring cells based on the received configuration and reports them to the serving cell. The serving cell makes a handover decision based on the measurement report. Before this, the serving cell can also trigger the UE to perform timing advance (TA) acquisition of the target cell, obtain the TA in advance, and carry the acquired valid TA value in the L1L2 cell change command to the UE, thereby implementing a random access channel (RACH-less) cell change process and shortening the interruption delay.

[0212] (2)TA acquisition mechanism in R18 LTM;

[0213] In R18 LTM, the acquisition of the TA of candidate cells is achieved through network-side control. That is, the network side determines which candidate cells' TAs to obtain based on information such as the measurement results reported by the UE, and sends a Physical Downlink Control Channel (PDCCH) order, which carries the corresponding candidate cell ID, preamble index (PREAMBLE index), synchronization signal / physical broadcast channel signal block (or synchronization signal block) (Synchronization Signal and PBCH block, SSB) index and other related information. The UE sends a PRAMBLE to the indicated candidate cell based on this. The candidate cell receives the PREAMBLE to calculate the TA and sends the obtained TA to the source cell. When LTM handover is triggered, the network will carry the TA value of the LTM target cell in the LTM command.

[0214] In related technologies, the network determines which candidate cells' TAs to acquire based on information such as measurement results and triggers TA acquisition through a PDCCH order. However, in R19 conditional LTM, both measurement and evaluation are performed by the UE, leaving the network unable to determine when, whether, and which candidate cells to trigger TA acquisition. This can result in the UE not having the TA value of the target cell to which it is handing over. Consequently, the UE will always initiate random access when performing LTM, leading to longer handover interruption delays and reduced performance.

[0215] As shown in FIG2 , an embodiment of the present disclosure provides a method for obtaining a timing advance, which is executed by a terminal. The method includes:

[0216] Step 201: Obtain a radio resource control RRC message, where the RRC message includes configuration information for obtaining a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell.

[0217] In some embodiments, the terminal obtains an RRC message sent by a network side device, which may include a random access resource configuration for candidate cell TA acquisition, a conditional LTM configuration and / or a configuration of whether to perform terminal-based TA (UE based TA) measurement, so that the terminal determines the candidate cell for early TA acquisition based on the RRC message.

[0218] In some embodiments, the random access resource configuration includes at least one of a preamble and a random access channel occasion (RACH occasion).

[0219] Step 202: Determine a target LTM candidate cell among the LTM candidate cells, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed.

[0220] In some embodiments, the terminal measures candidate cells based on the conditional LTM configuration, obtains measurement results, and determines a target layer 1 / 2 triggered mobility candidate cell, ie, a target LTM candidate cell, based on the measurement results.

[0221] In some embodiments, before the terminal determines the target LTM candidate cell, the method further includes:

[0222] Get the decision threshold pre-configured on the network side.

[0223] The terminal determines the target LTM candidate cell based on the decision threshold and the measurement result.

[0224] Step 203: Initiate a TA acquisition process for the target LTM candidate cell or calculate the TA of the target LTM candidate cell according to the configuration information.

[0225] In the embodiment of the present disclosure, the above-mentioned configuration information may implicitly or explicitly indicate the TA acquisition method corresponding to the candidate cell, and the TA acquisition method includes calculation by the terminal or initiation of the TA acquisition process by the terminal. For example, the TA acquisition method corresponding to the candidate cell may be explicitly indicated by including indication information of the TA acquisition method in the configuration information. For another example, when the configuration information includes a random access resource configuration for TA extraction and acquisition of certain candidate cells, it is implicitly indicated that these candidate cells adopt a method of initiating a TA acquisition process by the terminal to obtain the TA of the candidate cell, or, when the configuration information does not include a random access resource configuration for TA extraction and acquisition of certain candidate cells, it is implicitly indicated that these candidate cells adopt a method of calculating the TA by the terminal to obtain the TA of the candidate cell.

[0226] In some embodiments, the terminal calculates the TA based on the reference signals of the configured candidate cells.

[0227] In the disclosed embodiment, a terminal obtains an RRC message containing configuration information for acquiring the timing advance (TA) of a candidate cell; determines a target LTM candidate cell for TA acquisition among the LTM candidate cells; and initiates a TA acquisition process for the target LTM candidate cell or calculates the TA of the target LTM candidate cell based on the configuration information. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, effectively avoiding interruptions and delay overhead caused by the terminal-initiated random access process, and effectively improving system transmission performance.

[0228] In some embodiments, the configuration information includes at least one of the following:

[0229] Conditional LTM configuration identifier, that is, conditional LTM configuration identifier;

[0230] Physical Cell Identifier (PCI) and / or frequency of the LTM candidate cell;

[0231] The LTM candidate cell is used for the TA to obtain the preamble index (PREAMBLE index(s)) in advance;

[0232] The LTM candidate cell is used for the TA to obtain the random access channel opportunity (RACH occasion) related configuration in advance;

[0233] The indication information of whether to perform terminal-based TA measurement may be configured for each candidate cell or may be common configuration information.

[0234] As an implementation manner, in the case where the configuration information includes RACH occasion related configuration and / or preamble index, the TA acquisition process of the target LTM candidate cell may be initiated based on the RACH occasion related configuration and / or preamble index.

[0235] As an implementation manner, when the configuration information includes the indication information, and the indication information indicates to perform terminal-based TA measurement, the terminal calculates the TA of the target LTM candidate cell.

[0236] In some embodiments, initiating a TA acquisition process for the target LTM candidate cell according to the configuration information includes:

[0237] sending a target preamble on a target random access channel opportunity;

[0238] The target random access channel opportunity is a random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble is a preamble corresponding to a preamble index used by the target LTM candidate cell for early TA acquisition.

[0239] In some embodiments, after sending the target preamble on the target random access channel opportunity, the method further includes at least one of the following:

[0240] Monitor the random access response (RAR) sent by the target LTM candidate cell;

[0241] Synchronize with the serving cell and monitor RAR;

[0242] After receiving the RAR, resynchronize with the serving cell;

[0243] receiving a first downlink message sent by a serving cell, where the first downlink message includes a TA of a target LTM candidate cell;

[0244] The RAR includes the TA of the target LTM candidate cell.

[0245] It should be noted that the TA value in the embodiments of the present disclosure may be an absolute value, a mapped value, or a difference value. When the TA value is a difference value, it may be a difference value relative to the TA of a specified cell or a difference value relative to a reference value, such as a difference value relative to the TA of the current serving cell.

[0246] In some embodiments, the first downlink message further includes at least one of the following:

[0247] Conditional LTM configuration flag;

[0248] PCI and / or frequency of the target LTM candidate cell.

[0249] In some embodiments, before sending the target preamble code on the target random access channel opportunity, the method further includes:

[0250] Perform downlink synchronization with the target LTM candidate cell.

[0251] In some embodiments, the method of the present disclosure further includes:

[0252] A target message is sent, where the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

[0253] As an implementation manner, the target message includes an identifier of the target LTM candidate cell and TA status indication information, where the TA status indication information is used to indicate whether the TA is valid.

[0254] For example, if the terminal obtains a valid TA for a target LTM candidate cell, the terminal notifies the serving cell that the target LTM candidate cell has a valid TA. If the TA is invalid, the terminal notifies the serving cell that the target LTM candidate cell does not have a valid TA. In some embodiments, the initial status of the TA of all candidate cells can be invalid by default. If the validity status of the TA of a candidate cell changes, a corresponding notification is sent to the serving cell. This allows the serving cell to determine which candidate cells are likely to be accessed based on the target information and to make some preparations in advance.

[0255] In the disclosed embodiment, a terminal obtains an RRC message containing configuration information for acquiring the timing advance (TA) of a candidate cell; determines a target LTM candidate cell for TA acquisition among the LTM candidate cells; and initiates a TA acquisition process for the target LTM candidate cell or calculates the TA of the target LTM candidate cell based on the configuration information. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, effectively avoiding interruptions and delay overhead caused by the terminal-initiated random access process, and effectively improving system transmission performance.

[0256] As shown in FIG3 , an embodiment of the present disclosure further provides a method for obtaining a timing advance, which is performed by a network-side device. The method includes:

[0257] Step 301: Send an RRC message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell.

[0258] The RRC message may include random access resource configuration for candidate cell TA acquisition, conditional LTM configuration and / or configuration of whether to perform terminal-based TA (UE based TA) measurement, so that the terminal determines the candidate cell for TA early acquisition based on the RRC message.

[0259] In some embodiments, the random access resource configuration includes at least one of a preamble and a random access channel occasion (RACH occasion).

[0260] In the disclosed embodiment, the network-side device sends an RRC message so that the terminal can initiate a TA acquisition process for the target LTM candidate cell or calculate the TA of the target LTM candidate cell based on the configuration information. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, thereby effectively avoiding the interruption and delay overhead caused by the terminal-initiated random access process and effectively improving system transmission performance.

[0261] In some embodiments, the configuration information includes at least one of the following:

[0262] Conditional LTM configuration flag;

[0263] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0264] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0265] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0266] Indication of whether to perform terminal-based TA measurement.

[0267] In some embodiments, the method of the present disclosure further includes:

[0268] Get the TA sent by the target LTM candidate cell;

[0269] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0270] In some embodiments, the first downlink message is at least one of the following:

[0271] Random Access Response (RAR);

[0272] Media Access Control Unit (MAC CE);

[0273] Radio Resource Control (RRC) reconfiguration message.

[0274] In some embodiments, the first downlink message further includes at least one of the following:

[0275] Conditional LTM configuration flag;

[0276] PCI and / or frequency of the target LTM candidate cell.

[0277] In some embodiments, the method of the present disclosure further includes:

[0278] A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

[0279] As an implementation manner, the target message includes an identifier of the target LTM candidate cell and TA status indication information, where the TA status indication information is used to indicate whether the TA is valid.

[0280] For example, if the terminal obtains a valid TA for a target LTM candidate cell, the terminal notifies the serving cell that the target LTM candidate cell has a valid TA. If the TA is invalid, the terminal notifies the serving cell that the target LTM candidate cell does not have a valid TA. In some embodiments, the initial status of the TA of all candidate cells can be invalid by default. If the validity status of the TA of a candidate cell changes, a corresponding notification is sent to the serving cell. This allows the serving cell to determine which candidate cells are likely to be accessed based on the target information and to make some preparations in advance.

[0281] In the disclosed embodiment, a terminal obtains an RRC message containing configuration information for acquiring the timing advance (TA) of a candidate cell; determines a target LTM candidate cell for TA acquisition among the LTM candidate cells; and initiates a TA acquisition process for the target LTM candidate cell or calculates the TA of the target LTM candidate cell based on the configuration information. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, effectively avoiding interruptions and delay overhead caused by the terminal-initiated random access process, and effectively improving system transmission performance.

[0282] The interaction between the terminal and the network side is described below with reference to embodiments.

[0283] Example 1:

[0284] Step 1: The serving cell interacts with the candidate cell, and the serving cell obtains from the candidate cell a dedicated random access channel (RACH) resource pre-configured by the candidate cell for LTM in advance, wherein the RACH resource includes a preamble and / or a RACH occasion; and sends the dedicated RACH resource to the UE; wherein the sending of the RACH resource can be sent to the UE together with the conditional LTM configuration, or before or after the configuration message.

[0285] From the signaling perspective, the configuration of the dedicated RACH resource includes the following forms (signaling structure):

[0286] The RACH configuration is provided to the UE on a per candidate basis, i.e., it is configured in parallel with the execution conditions of each candidate cell;

[0287] Alternatively, the RACH configuration is a common resource pool, for example, the index corresponding to each RACH configuration in the RACH configuration list corresponds to the order of the conditional LTM configuration identifiers one by one;

[0288] Step 2: The UE measures candidate cells and determines the LTM candidate cells for which to initiate early TA acquisition based on the measurement results.

[0289] Step 3: The UE obtains the SSB of the LTM candidate cell determined in step 2 for initiating early TA acquisition and performs downlink synchronization;

[0290] If the UE has been synchronized with the LTM candidate cell in advance and the relevant downlink synchronization information is retained, the UE can directly use the downlink timing information for synchronization;

[0291] In some embodiments, the UE initiates this process if and only if there is no valid TA for the LTM candidate cell on the UE side;

[0292] Step 4: The UE sends a PREAMBLE to the LTM candidate cell based on the dedicated RACH resources pre-configured by the network side; in some embodiments, the UE resynchronizes with the source serving cell;

[0293] Step 5a: The candidate cell receives the (dedicated) PREAMBLE sent by the UE in the (dedicated) RACH occasion, calculates the TA and sends it to the UE via the RAR;

[0294] Step 5b: The candidate cell receives the (dedicated) PREAMBLE sent by the UE in the (dedicated) RACH occasion, calculates the TA and passes the RAR or the TA to the serving cell, which then sends it to the UE.

[0295] Step 5a and step 5b are parallel steps.

[0296] Step 6: The UE saves and maintains the received TA value;

[0297] Step 7: In some embodiments, the UE resynchronizes with the source serving cell.

[0298] Through the above solution, in the candidate LTM scenario, the UE can obtain the TA value of the target cell to be handed over, thereby avoiding the interruption and delay overhead caused by the UE initiating the traditional RACH process, and avoiding the power consumption and impact on data scheduling caused by obtaining the TA values ​​of all candidate cells.

[0299] As shown in FIG4 , an embodiment of the present disclosure further provides a method for obtaining a timing advance, which is executed by a terminal. The method includes:

[0300] Step 401: Determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for performing TA early acquisition.

[0301] In some embodiments, the terminal performs measurement of candidate cells based on the conditional LTM configuration, obtains measurement results, and determines a target LTM candidate cell, ie, a target LTM candidate cell, based on the measurement results.

[0302] Step 402: Send a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0303] In the disclosed embodiment, a terminal determines a target LTM candidate cell, which is a candidate cell for which TA acquisition is to be performed in advance, and sends a first uplink message requesting the network to trigger a TA acquisition process for the target LTM candidate cell. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, thereby effectively avoiding the interruption and delay overhead caused by the terminal-initiated random access process and effectively improving system transmission performance.

[0304] In some embodiments, the first uplink message includes at least one of the following:

[0305] Conditional LTM configuration flag;

[0306] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0307] Synchronization signal / physical broadcast channel signal block SSB index;

[0308] L1 measurement results corresponding to the LTM candidate cells;

[0309] Channel State Information Reference Signal (CSI-RS) index;

[0310] Beam-related indication information; the beam-related indication information includes but is not limited to an SSB index, a CSI-RS index and / or a transmission configuration indication (TCI) identifier.

[0311] Request to obtain the instruction information of TA.

[0312] In some embodiments, the method of the present disclosure further includes:

[0313] monitoring a PDCCH command sent by the network side device, where the PDCCH command includes a random access channel resource;

[0314] Sending a preamble to a target LTM candidate cell according to the random access channel resources;

[0315] A first downlink message is obtained, where the first downlink message includes a TA of a target LTM candidate cell.

[0316] In some embodiments, the first downlink message further includes at least one of the following:

[0317] Conditional LTM configuration flag;

[0318] PCI and / or frequency of the target LTM candidate cell.

[0319] In some embodiments, the method of the present disclosure further includes:

[0320] A target message is sent, where the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

[0321] As an implementation manner, the target message includes an identifier of the target LTM candidate cell and TA status indication information, where the TA status indication information is used to indicate whether the TA is valid.

[0322] For example, if the terminal obtains a valid TA for a target LTM candidate cell, the terminal notifies the serving cell that the target LTM candidate cell has a valid TA. If the TA is invalid, the terminal notifies the serving cell that the target LTM candidate cell does not have a valid TA. In some embodiments, the initial status of the TA of all candidate cells can be invalid by default. If the validity status of the TA of a candidate cell changes, a corresponding notification is sent to the serving cell. This allows the serving cell to determine which candidate cells are likely to be accessed based on the target information and to make some preparations in advance.

[0323] In the disclosed embodiment, a terminal obtains an RRC message containing configuration information for acquiring the timing advance (TA) of a candidate cell; determines a target LTM candidate cell for TA acquisition among the LTM candidate cells; and initiates a TA acquisition process for the target LTM candidate cell or calculates the TA of the target LTM candidate cell based on the configuration information. This enables the terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, effectively avoiding interruptions and delay overhead caused by the terminal-initiated random access process, and effectively improving system transmission performance.

[0324] As shown in FIG5 , an embodiment of the present disclosure further provides a method for obtaining a timing advance, which is performed by a network-side device. The method includes:

[0325] Step 501: Obtain a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0326] The first uplink message is sent after the terminal measures candidate cells based on the conditional LTM configuration, obtains measurement results, and determines a target LTM candidate cell based on the measurement results.

[0327] Step 502: triggering a TA acquisition process of the target LTM candidate cell according to the first uplink message.

[0328] In the disclosed embodiment, a network-side device receives a first uplink message requesting the network to trigger a TA acquisition process for the target LTM candidate cell. The TA acquisition process for the target LTM candidate cell is triggered based on the first uplink message. This enables a terminal to obtain the TA value of the target cell to be handed over in a conditional LTM scenario, effectively avoiding interruptions and latency overhead caused by the terminal-initiated random access process and improving system transmission performance.

[0329] In some embodiments, the first uplink message includes at least one of the following:

[0330] Conditional LTM configuration flag;

[0331] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0332] Synchronization signal / physical broadcast channel signal block SSB index;

[0333] L1 measurement results corresponding to the LTM candidate cells;

[0334] Channel state information reference signal CSI-RS index;

[0335] Beam related indication information;

[0336] Request to obtain the instruction information of TA.

[0337] In some embodiments, triggering a TA acquisition process of the target LTM candidate cell according to the first uplink message includes:

[0338] interacting with a target LTM candidate cell according to the first uplink message to obtain random access channel resources;

[0339] A PDCCH command is sent to the terminal, where the PDCCH command includes random access channel resources.

[0340] In some embodiments, the method of the present disclosure further includes:

[0341] Get the TA sent by the target LTM candidate cell;

[0342] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0343] In some embodiments, the first downlink message further includes at least one of the following:

[0344] Conditional LTM configuration flag;

[0345] PCI and / or frequency of the target LTM candidate cell.

[0346] In some embodiments, the method of the present disclosure further includes:

[0347] A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

[0348] As an implementation manner, the target message includes an identifier of the target LTM candidate cell and TA status indication information, where the TA status indication information is used to indicate whether the TA is valid.

[0349] For example, if the terminal obtains a valid TA for a target LTM candidate cell, the terminal notifies the serving cell that the target LTM candidate cell has a valid TA. If the TA is invalid, the terminal notifies the serving cell that the target LTM candidate cell does not have a valid TA. In some embodiments, the initial status of the TA of all candidate cells can be invalid by default. If the validity status of the TA of a candidate cell changes, a corresponding notification is sent to the serving cell. This allows the serving cell to determine which candidate cells are likely to be accessed based on the target information and to make some preparations in advance.

[0350] The interaction between the terminal and the network side is described below with reference to embodiments.

[0351] Example 2:

[0352] Step 1: The UE receives the conditional LTM configuration sent by the network side;

[0353] Step 2: The UE measures the candidate cells and determines the target LTM candidate cell for initiating early TA acquisition based on the measurement results;

[0354] Step 3: The UE sends a first uplink message to the serving cell, where the message carries:

[0355] Conditional LTM configuration flag, and / or;

[0356] Candidate cell PCI, and / or frequency, and / or;

[0357] SSB index, and / or;

[0358] L1 measurement results corresponding to the target LTM candidate cell, and / or;

[0359] Request to obtain TA's instruction information

[0360] In some embodiments, the UE initiates this process if and only if there is no valid TA for the LTM candidate cell on the UE side;

[0361] Step 4: The serving cell interacts with the candidate cell through an interface based on the target LTM candidate cell information carried in the first uplink message, negotiates RACH resources, and issues a PDCCH order containing information such as the candidate cell identifier, SSB index, and mask index, triggering the UE to initiate a RACH process toward the candidate cell.

[0362] In some embodiments, if the above message carries an SSB identifier, the network side can directly specify the UE to use the SSB to initiate the RACH process in the subsequent PDCCH order;

[0363] Alternatively, if the above message carries the L1 measurement result, the network side may further determine the SSB used by the PDCCH order to trigger the UE to initiate the RACH based on the L1 measurement result.

[0364] Step 5: Based on the information indicated by the PDCCH order, the UE sends a PREAMBLE message toward the candidate cell using the dedicated resources specified in the PDCCH order; then, the UE resynchronizes with the source serving cell;

[0365] Step 6: The candidate cell receives the sent PREAMBLE, calculates the TA and transmits the RAR or the TA to the serving cell;

[0366] Step 7: The serving cell sends a first downlink message to pass the acquired TA-related information to the UE. The first downlink message may be a RAR, a MAC CE, or an RRC message, and the first downlink message carries the following information:

[0367] Conditional LTM configuration flag;

[0368] Candidate cell PCI and / or frequency;

[0369] The TA value of the conditional LTM candidate cell.

[0370] Through the above solution, in the candidate LTM scenario, the UE can obtain the TA value of the target cell to be handed over, thereby avoiding the interruption and delay overhead caused by the UE initiating the traditional RACH process, and avoiding the power consumption and impact on data scheduling caused by obtaining the TA values ​​of all candidate cells.

[0371] Example 3:

[0372] Step 1: TA obtained based on the above embodiment 1 or embodiment 2, or TA calculated by the UE itself;

[0373] Step 2a: The UE periodically, or each time it obtains the TA of a candidate cell, or updates an invalid TA, sends a second uplink message to the network side. The message carries the following information:

[0374] Conditional LTM configuration flag;

[0375] PCI and / or frequency of candidate cells;

[0376] There is a valid TA on the candidate cell;

[0377] Step 2b: The UE periodically sends a second uplink message to the network side, or when the TA of the candidate cell fails and no valid TA is obtained, and the message carries the following information:

[0378] Conditional LTM configuration flag;

[0379] PCI and / or frequency of candidate cells;

[0380] There is no valid TA on the candidate cell.

[0381] Step 2a and step 2b are parallel steps.

[0382] Step 3: Based on the above information, the network updates the candidate cell list with valid TA or the candidate cell list without valid TA that it maintains.

[0383] In this way, the network can determine which candidate cells are likely to be accessed based on the above information, and can then make some access preparations in advance).

[0384] As shown in FIG6 , an embodiment of the present disclosure provides a timing advance acquisition device, which is applied to a terminal and includes a memory 620 , a transceiver 600 , and a processor 610 ;

[0385] The memory 620 is used to store computer programs; the transceiver 600 is used to send and receive data under the control of the processor 610;

[0386] In one embodiment of the present disclosure, the processor 610 is configured to read the computer program in the memory 620 and perform the following operations:

[0387] Obtaining a radio resource control (RRC) message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell;

[0388] Determine a target LTM candidate cell among the LTM candidate cells, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed;

[0389] According to the configuration information, a TA acquisition process of the target LTM candidate cell is initiated or the TA of the target LTM candidate cell is calculated.

[0390] In some embodiments, the configuration information includes at least one of the following:

[0391] Conditional LTM configuration flag;

[0392] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0393] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0394] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0395] Indication of whether to perform terminal-based TA measurement.

[0396] In some embodiments, the processor further implements the following steps:

[0397] sending a target preamble on a target random access channel opportunity;

[0398] The target random access channel opportunity is a random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble is a preamble corresponding to a preamble index used by the target LTM candidate cell for early TA acquisition.

[0399] In some embodiments, the processor further implements at least one of the following:

[0400] Monitor the random access response (RAR) sent by the target LTM candidate cell;

[0401] Synchronize with the serving cell and monitor RAR;

[0402] After receiving the RAR, resynchronize with the serving cell;

[0403] receiving a first downlink message sent by a serving cell, where the first downlink message includes a TA of a target LTM candidate cell;

[0404] The RAR includes the TA of the target LTM candidate cell.

[0405] In some embodiments, the first downlink message further includes at least one of the following:

[0406] Conditional LTM configuration flag;

[0407] PCI and / or frequency of the target LTM candidate cell.

[0408] In some embodiments, the processor further implements the following steps:

[0409] Perform downlink synchronization with the target LTM candidate cell.

[0410] In some embodiments, the processor further implements the following steps:

[0411] A target message is sent, where the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

[0412] In one embodiment of the present disclosure, the processor 610 is configured to read the computer program in the memory 620 and perform the following operations:

[0413] Determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for TA early acquisition;

[0414] A first uplink message is sent, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0415] In some embodiments, the first uplink message includes at least one of the following:

[0416] Conditional LTM configuration flag;

[0417] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0418] Synchronization signal / physical broadcast channel signal block SSB index;

[0419] L1 measurement results corresponding to the LTM candidate cells;

[0420] Channel state information reference signal CSI-RS index;

[0421] Beam related indication information;

[0422] Request to obtain the instruction information of TA.

[0423] In some embodiments, the processor further implements the following steps:

[0424] monitoring a PDCCH command sent by the network side device, where the PDCCH command includes a random access channel resource;

[0425] Sending a preamble to a target LTM candidate cell according to the random access channel resources;

[0426] A first downlink message is obtained, where the first downlink message includes a TA of a target LTM candidate cell.

[0427] In some embodiments, the first downlink message further includes at least one of the following:

[0428] Conditional LTM configuration flag;

[0429] PCI and / or frequency of the target LTM candidate cell.

[0430] In FIG6 , the bus architecture may include any number of interconnected buses and bridges, specifically various circuits connected together by one or more processors represented by processor 610 and memory represented by memory 620. The bus architecture may also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 600 may be a plurality of components, 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. For different user devices, the user interface 630 may also be an interface capable of connecting external or internal devices as required, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0431] The processor 610 is responsible for managing the bus architecture and general processing, and the memory 620 can store data used by the processor 610 when performing operations.

[0432] In some embodiments, the processor 610 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0433] The processor calls the computer program stored in the memory to execute any of the methods provided by the embodiments of the present disclosure according to the obtained executable instructions. The processor and the memory can also be arranged physically separately.

[0434] It should be noted here that the above-mentioned device provided by the embodiment of the present disclosure can implement all the method steps implemented by the above-mentioned embodiment of the method for obtaining the time advance amount applied to the terminal, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0435] As shown in FIG7 , an embodiment of the present disclosure further provides a timing advance acquisition device, comprising a memory 720 , a transceiver 700 , and a processor 710 ;

[0436] The memory 720 is used to store computer programs; the transceiver 700 is used to send and receive data under the control of the processor;

[0437] In one embodiment of the present disclosure, the processor 710 is configured to read the computer program in the memory and perform the following operations:

[0438] An RRC message is sent, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell.

[0439] In some embodiments, the configuration information includes at least one of the following:

[0440] Conditional LTM configuration flag;

[0441] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0442] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0443] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0444] Indication of whether to perform terminal-based TA measurement.

[0445] In some embodiments, the processor further implements the following steps:

[0446] Get the TA sent by the target LTM candidate cell;

[0447] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0448] In some embodiments, the first downlink message is at least one of the following:

[0449] Random access response RAR;

[0450] Media access layer control unit MAC CE;

[0451] RRC reconfiguration message.

[0452] In some embodiments, the first downlink message further includes at least one of the following:

[0453] Conditional LTM configuration flag;

[0454] PCI and / or frequency of the target LTM candidate cell.

[0455] In some embodiments, the processor further implements the following steps:

[0456] A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

[0457] In one embodiment of the present disclosure, the processor 710 is configured to read the computer program in the memory and perform the following operations:

[0458] Obtaining a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell;

[0459] According to the first uplink message, a TA acquisition process of the target LTM candidate cell is triggered.

[0460] In some embodiments, the first uplink message includes at least one of the following:

[0461] Conditional LTM configuration flag;

[0462] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0463] Synchronization signal / physical broadcast channel signal block SSB index;

[0464] L1 measurement results corresponding to the LTM candidate cells;

[0465] Channel state information reference signal CSI-RS index;

[0466] Beam related indication information;

[0467] Request to obtain the instruction information of TA.

[0468] In some embodiments, the processor further implements the following steps:

[0469] interacting with a target LTM candidate cell according to the first uplink message to obtain random access channel resources;

[0470] A PDCCH command is sent to the terminal, where the PDCCH command includes random access channel resources.

[0471] In some embodiments, the processor further implements the following steps:

[0472] Get the TA sent by the target LTM candidate cell;

[0473] A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0474] In some embodiments, the first downlink message further includes at least one of the following:

[0475] Conditional LTM configuration flag;

[0476] PCI and / or frequency of the target LTM candidate cell.

[0477] In FIG7 , the bus architecture may include any number of interconnected buses and bridges, specifically various circuits linked together by one or more processors represented by processor 710 and memory represented by memory 720. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 700 may be a plurality of components, namely, a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, or the like. The processor 710 is responsible for managing the bus architecture and general processing, and the memory 720 may store data used by the processor 710 when performing operations.

[0478] The processor 710 may be a central processing unit (CPU), an application specific integrated circuit (ASIC), a field programmable gate array (FPGA), or a complex programmable logic device (CPLD). The processor may also adopt a multi-core architecture.

[0479] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment applied to the network side device, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0480] As shown in FIG8 , the embodiment of the present disclosure further provides a device for obtaining a timing advance, including:

[0481] A first acquiring unit 801 is configured to acquire a radio resource control (RRC) message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell;

[0482] A first determining unit 802 is configured to determine a target LTM candidate cell among the LTM candidate cells, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed;

[0483] The first processing unit 803 is configured to initiate a TA acquisition process of the target LTM candidate cell or calculate the TA of the target LTM candidate cell according to the configuration information.

[0484] In some embodiments, the configuration information includes at least one of the following:

[0485] Conditional LTM configuration flag;

[0486] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0487] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0488] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0489] Indication of whether to perform terminal-based TA measurement.

[0490] In some embodiments, the first processing unit is configured to send a target preamble on a target random access channel opportunity;

[0491] The target random access channel opportunity is a random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble is a preamble corresponding to a preamble index used by the target LTM candidate cell for early TA acquisition.

[0492] In some embodiments, the apparatus of the present disclosure further includes:

[0493] The third processing unit is configured to perform at least one of the following after the second processing unit sends the target preamble code on the target random access channel opportunity:

[0494] Monitor the random access response (RAR) sent by the target LTM candidate cell;

[0495] Synchronize with the serving cell and monitor RAR;

[0496] After receiving the RAR, resynchronize with the serving cell;

[0497] receiving a first downlink message sent by a serving cell, where the first downlink message includes a TA of a target LTM candidate cell;

[0498] The RAR includes the TA of the target LTM candidate cell.

[0499] In some embodiments, the first downlink message further includes at least one of the following:

[0500] Conditional LTM configuration flag;

[0501] PCI and / or frequency of the target LTM candidate cell.

[0502] In some embodiments, the apparatus of the present disclosure further includes:

[0503] The fourth processing unit is configured to perform downlink synchronization with the target LTM candidate cell before the first processing unit sends the target preamble code on the target random access channel opportunity.

[0504] In some embodiments, the apparatus of the present disclosure further includes:

[0505] The third sending unit is configured to send a target message, where the target message is used to notify the serving cell of the valid state of the TA of the target LTM candidate cell.

[0506] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment applied to the terminal, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0507] As shown in FIG9 , the embodiment of the present disclosure further provides a device for obtaining a timing advance, including:

[0508] The first sending unit 901 is configured to send an RRC message, where the RRC message includes configuration information for acquiring a timing advance (TA) of a candidate cell, where the candidate cell is an LTM candidate cell.

[0509] In some embodiments, the configuration information includes at least one of the following:

[0510] Conditional LTM configuration flag;

[0511] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0512] The LTM candidate cell is used for the preamble index of the TA to obtain in advance;

[0513] The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA;

[0514] Indication of whether to perform terminal-based TA measurement.

[0515] In some embodiments, the apparatus of the present disclosure further includes:

[0516] A third acquiring unit is configured to acquire a TA sent by a target LTM candidate cell;

[0517] The fourth sending unit is configured to send a first downlink message to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0518] In some embodiments, the first downlink message is at least one of the following:

[0519] Random access response RAR;

[0520] Media access layer control unit MAC CE;

[0521] RRC reconfiguration message.

[0522] In some embodiments, the first downlink message further includes at least one of the following:

[0523] Conditional LTM configuration flag;

[0524] PCI and / or frequency of the target LTM candidate cell.

[0525] In some embodiments, the apparatus of the present disclosure further includes:

[0526] The fourth acquiring unit is configured to acquire a target message, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

[0527] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment applied to the network side device, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0528] As shown in FIG10 , the embodiment of the present disclosure further provides a device for obtaining a timing advance, including:

[0529] The second determining unit 1001 is configured to determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for performing TA early acquisition;

[0530] The second sending unit 1002 is configured to send a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

[0531] In some embodiments, the first uplink message includes at least one of the following:

[0532] Conditional LTM configuration flag;

[0533] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0534] Synchronization signal / physical broadcast channel signal block SSB index;

[0535] L1 measurement results corresponding to the LTM candidate cells;

[0536] Channel State Information Reference Signal CSI-RS index;

[0537] Beam related indication information;

[0538] Request to obtain the instruction information of TA.

[0539] In some embodiments, the apparatus of the present disclosure further includes:

[0540] A monitoring unit, configured to monitor a PDCCH command sent by the network side device, wherein the PDCCH command includes a random access channel resource;

[0541] a fifth sending unit, configured to send a preamble to a target LTM candidate cell according to the random access channel resources;

[0542] The fifth acquiring unit is configured to acquire a first downlink message, where the first downlink message includes the TA of the target LTM candidate cell.

[0543] In some embodiments, the first downlink message further includes at least one of the following:

[0544] Conditional LTM configuration flag;

[0545] PCI and / or frequency of the target LTM candidate cell.

[0546] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment applied to the terminal, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0547] As shown in FIG11 , an embodiment of the present disclosure further provides a device for obtaining a timing advance, including:

[0548] The second acquiring unit 1101 is configured to acquire a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell;

[0549] The second processing unit 1102 is configured to trigger a TA acquisition process of the target LTM candidate cell according to the first uplink message.

[0550] In some embodiments, the first uplink message includes at least one of the following:

[0551] Conditional LTM configuration flag;

[0552] Physical cell identifier PCI and / or frequency of the LTM candidate cell;

[0553] Synchronization signal / physical broadcast channel signal block SSB index;

[0554] L1 measurement results corresponding to the LTM candidate cells;

[0555] Channel state information reference signal CSI-RS index;

[0556] Beam related indication information;

[0557] Request to obtain the instruction information of TA.

[0558] In some embodiments, the second processing unit includes:

[0559] an acquisition subunit, configured to interact with a target LTM candidate cell according to the first uplink message to acquire random access channel resources;

[0560] The sending subunit is configured to send a PDCCH command to the terminal, where the PDCCH command includes random access channel resources.

[0561] In some embodiments, the apparatus of the present disclosure further includes:

[0562] a sixth acquiring unit, configured to acquire a TA sent by a target LTM candidate cell;

[0563] The sixth sending unit is configured to send a first downlink message to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

[0564] In some embodiments, the first downlink message further includes at least one of the following:

[0565] Conditional LTM configuration flag;

[0566] PCI and / or frequency of the target LTM candidate cell.

[0567] It should be noted here that the above-mentioned device provided in the embodiment of the present disclosure can implement all the method steps implemented in the above-mentioned method embodiment applied to the network side device, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0568] It should be noted that the division of units in the embodiments of the present disclosure is schematic and is merely a logical functional division. In actual implementation, other division methods may be used. Furthermore, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0569] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the relevant technology or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the method described in each embodiment of the present disclosure. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0570] In some embodiments of the present disclosure, a processor-readable storage medium is also provided, which stores program instructions. The program instructions are used to enable the processor to execute all the steps implemented by the method embodiment for implementing the above-mentioned terminal execution or all the steps implemented by the method embodiment for implementing the network side device, and can achieve the same technical effect. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0571] The terminal device involved in the embodiments of the present disclosure may be a device that provides voice and / or data connectivity to a user, a handheld device with wireless connection function, or other processing devices connected to a wireless modem. In different systems, the name of the terminal device may also be different. For example, in a 5G system, the terminal device may be called User Equipment (UE). A wireless terminal device can communicate with one or more core networks (CN) via a radio access network (RAN). The wireless terminal device may be a mobile terminal device, such as a mobile phone (or "cellular" phone) and a computer with a mobile terminal device. For example, it may be a portable, pocket-sized, handheld, computer-built-in or vehicle-mounted mobile device that exchanges voice and / or data with a radio access network. For example, personal communication service (PCS) phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), and other devices. The wireless terminal device may also be referred to as a system, a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal device, an access terminal device, a user terminal device, a user agent, or a user device, but is not limited in the embodiments of the present disclosure.

[0572] The network device (or network-side device) involved in the embodiments of the present disclosure may be a base station, which may include multiple cells providing services to terminals. Depending on the specific application scenario, the base station may also be called an access point, or may be a device in an access network that communicates with a wireless terminal device through one or more sectors on an air interface, or may be called another name. The network device may be used to interchange received air frames with Internet Protocol (IP) packets, acting as a router between the wireless terminal device and the rest of the access network, wherein the rest of the access network may include an Internet Protocol (IP) communication network. The network device may also coordinate attribute management of the air interface. For example, the network device involved in the embodiments of the present disclosure may be a base transceiver station (BTS) in the Global System for Mobile communications (GSM) or code division multiple access (CDMA), a network device (NodeB) in wide-band code division multiple access (WCDMA), an evolutionary Node B (eNB or e-NodeB) in the Long Term Evolution (LTE) system, a 5G base station (gNB) in the 5G network architecture (next generation system), a home evolved Node B (HeNB), a relay node, a femto, a pico, etc., and is not limited in the embodiments of the present disclosure. In some network structures, the network device may include a centralized unit (CU) node and a distributed unit (DU) node, and the centralized unit and the distributed unit may also be geographically separated.

[0573] Network devices and terminal devices can each use one or more antennas for Multiple Input Multiple Output (MIMO) transmission. MIMO transmission can be single-user MIMO (SU-MIMO) or multi-user MIMO (MU-MIMO). Depending on the configuration and number of antenna combinations, MIMO transmission can be 2D-MIMO, 3D-MIMO, FD-MIMO, or massive-MIMO. It can also use diversity transmission, precoding, or beamforming.

[0574] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0575] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0576] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0577] These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0578] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

Claims

1. A method for obtaining a timing advance, performed by a terminal, the method comprising: Obtaining a radio resource control RRC message, the RRC message including configuration information for obtaining a timing advance TA of a candidate cell, the candidate cell being a layer 1 layer 2 triggered mobility LTM candidate cell; Determine a target LTM candidate cell among the LTM candidate cells, wherein the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed; According to the configuration information, the TA acquisition process of the target layer LTM candidate cell is initiated or the TA of the target LTM candidate cell is calculated.

2. The method according to claim 1, wherein: The configuration information includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; The LTM candidate cell is used for the preamble index of the TA to obtain in advance; The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA; Indication information of whether to perform terminal-based TA measurement.

3. The method according to claim 2, wherein: The initiating a TA acquisition process of the target LTM candidate cell according to the configuration information includes: Sending a target preamble code at a target random access channel opportunity; The target random access channel opportunity is the random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble code is the preamble code corresponding to the preamble code index used by the target LTM candidate cell to obtain TA in advance.

4. The method according to claim 3, wherein: After the target preamble is sent on the target random access channel opportunity, at least one of the following items is also included: Monitor the random access response RAR sent by the target LTM candidate cell; Synchronize with the serving cell and monitor RAR; After receiving the RAR, resynchronize with the serving cell; receiving a first downlink message sent by a serving cell, wherein the first downlink message includes a TA of a target LTM candidate cell; The RAR includes the TA of the target LTM candidate cell.

5. The method according to claim 4, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

6. The method according to any one of claims 3 to 5, wherein: Before sending the target preamble code on the target random access channel opportunity, the method further includes: Perform downlink synchronization with the target LTM candidate cell.

7. The method according to claim 1, further comprising: A target message is sent, wherein the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

8. A method for obtaining a timing advance, performed by a network side device, the method comprising: An RRC message is sent, wherein the RRC message includes configuration information for acquiring a timing advance TA of a candidate cell, wherein the candidate cell is a layer 1-2 triggered mobility LTM candidate cell.

9. The method according to claim 8, wherein: The configuration information includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; The LTM candidate cell is used for the preamble index of the TA to obtain in advance; The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA; Indication information of whether to perform terminal-based TA measurement.

10. The method according to claim 8, further comprising: Get the TA sent by the target LTM candidate cell; A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

11. The method according to claim 10, wherein: The first downlink message is at least one of the following: Random access response RAR; Media access layer control unit MAC CE; RRC reconfiguration message.

12. The method according to claim 10 or 11, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

13. The method according to claim 8, further comprising: A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

14. A method for acquiring a timing advance, executed by a terminal, the method comprising: Determine a target layer 1-2 triggered mobility LTM candidate cell, where the target LTM candidate cell is a candidate cell for TA advance acquisition; A first uplink message is sent, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

15. The method according to claim 14, wherein: The first uplink message includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; Synchronization signal / physical broadcast channel signal block SSB index; an L1 measurement result corresponding to the LTM candidate cell; Channel state information reference signal CSI-RS index; Beam related indication information; Request to obtain the instruction information of TA.

16. The method according to claim 14, wherein: Also includes: Monitoring a PDCCH command sent by the network side device, where the PDCCH command includes a random access channel resource; Sending a preamble to a target LTM candidate cell according to the random access channel resources; A first downlink message is obtained, where the first downlink message includes a TA of a target LTM candidate cell.

17. The method according to claim 16, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

18. A method for obtaining a timing advance, performed by a network side device, the method comprising: Obtaining a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process of a target layer 1-2 triggered mobility LTM candidate cell; According to the first uplink message, a TA acquisition process of the target LTM candidate cell is triggered.

19. The method according to claim 18, wherein: The first uplink message includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; Synchronization signal / physical broadcast channel signal block SSB index; an L1 measurement result corresponding to the LTM candidate cell; Channel state information reference signal CSI-RS index; Beam related indication information; Request to obtain the instruction information of TA.

20. The method according to claim 18, wherein: The triggering, according to the first uplink message, a TA acquisition process of the target LTM candidate cell includes: According to the first uplink message, interact with the target LTM candidate cell to obtain random access channel resources; A PDCCH command is sent to the terminal, where the PDCCH command includes random access channel resources.

21. The method according to claim 20, further comprising: Get the TA sent by the target LTM candidate cell; A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

22. The method according to claim 21, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

23. A timing advance acquisition device, comprising a memory, a transceiver, and a processor; Memory for storing computer programs; a transceiver, for transmitting and receiving data under the control of the processor; A processor is configured to read the computer program in the memory and perform the following operations: Obtaining a radio resource control RRC message, the RRC message including configuration information for obtaining a timing advance TA of a candidate cell, the candidate cell being a layer 1 layer 2 triggered mobility LTM candidate cell; Determine a target LTM candidate cell among the LTM candidate cells, wherein the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed; According to the configuration information, a TA acquisition process of the target LTM candidate cell is initiated or the TA of the target LTM candidate cell is calculated.

24. The device according to claim 23, wherein: The configuration information includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; The LTM candidate cell is used for the preamble index of the TA to obtain in advance; The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA; Indication information of whether to perform terminal-based TA measurement.

25. The device according to claim 24, wherein: The processor also implements the following steps: Sending a target preamble code at a target random access channel opportunity; The target random access channel opportunity is the random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble code is the preamble code corresponding to the preamble code index used by the target LTM candidate cell to obtain TA in advance.

26. The device according to claim 25, wherein The processor also implements at least one of the following: Monitor the random access response RAR sent by the target LTM candidate cell; Synchronize with the serving cell and monitor RAR; After receiving the RAR, resynchronize with the serving cell; receiving a first downlink message sent by a serving cell, wherein the first downlink message includes a TA of a target LTM candidate cell; The RAR includes the TA of the target LTM candidate cell.

27. The device according to claim 26, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

28. The device according to any one of claims 25 to 27, wherein: The processor also implements the following steps: Perform downlink synchronization with the target LTM candidate cell.

29. The device according to claim 23, wherein: The processor also implements the following steps: A target message is sent, wherein the target message is used to inform the serving cell of the validity status of the TA of the target LTM candidate cell.

30. A timing advance acquisition device, comprising a memory, a transceiver, and a processor; Memory for storing computer programs; a transceiver, for transmitting and receiving data under the control of the processor; A processor is configured to read the computer program in the memory and perform the following operations: An RRC message is sent, wherein the RRC message includes configuration information for acquiring a timing advance TA of a candidate cell, wherein the candidate cell is a layer 1-2 triggered mobility LTM candidate cell.

31. The device according to claim 30, wherein The configuration information includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; The LTM candidate cell is used for the preamble index of the TA to obtain in advance; The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA; Indication information of whether to perform terminal-based TA measurement.

32. The device according to claim 30, wherein: The processor also implements the following steps: Get the TA sent by the target LTM candidate cell; A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

33. The device according to claim 32, wherein: The first downlink message is at least one of the following: Random access response RAR; Media access layer control unit MAC CE; RRC reconfiguration message.

34. The device according to claim 32 or 33, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

35. The device according to claim 30, wherein: The processor also implements the following steps: A target message is obtained, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

36. A timing advance acquisition device, comprising a memory, a transceiver, and a processor; Memory for storing computer programs; a transceiver, for transmitting and receiving data under the control of the processor; A processor is configured to read the computer program in the memory and perform the following operations: Determine a target layer 1-2 triggered mobility LTM candidate cell, where the target LTM candidate cell is a candidate cell for TA advance acquisition; A first uplink message is sent, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

37. The device according to claim 36, wherein The first uplink message includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; Synchronization signal / physical broadcast channel signal block SSB index; an L1 measurement result corresponding to the LTM candidate cell; Channel state information reference signal CSI-RS index; Beam related indication information; Request to obtain the instruction information of TA.

38. The device according to claim 36, wherein The processor also implements the following steps: Monitoring a PDCCH command sent by the network side device, where the PDCCH command includes a random access channel resource; Sending a preamble to a target LTM candidate cell according to the random access channel resources; A first downlink message is obtained, where the first downlink message includes a TA of a target LTM candidate cell.

39. The device according to claim 38, wherein The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

40. A timing advance acquisition device, comprising a memory, a transceiver, and a processor; Memory for storing computer programs; a transceiver, for transmitting and receiving data under the control of the processor; A processor is configured to read the computer program in the memory and perform the following operations: Acquire a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process of a target LTM candidate cell; According to the first uplink message, a TA acquisition process of the target LTM candidate cell is triggered.

41. The device according to claim 40, wherein The first uplink message includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; Synchronization signal / physical broadcast channel signal block SSB index; an L1 measurement result corresponding to the LTM candidate cell; Channel state information reference signal CSI-RS index; Beam related indication information; Request to obtain the instruction information of TA.

42. The device according to claim 40, wherein: The processor also implements the following steps: According to the first uplink message, interact with the target LTM candidate cell to obtain random access channel resources; A PDCCH command is sent to the terminal, where the PDCCH command includes random access channel resources.

43. The device according to claim 42, wherein: The processor also implements the following steps: Get the TA sent by the target LTM candidate cell; A first downlink message is sent to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

44. The device according to claim 43, wherein The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

45. A device for obtaining a timing advance, comprising: A first acquisition unit is used to acquire a radio resource control RRC message, where the RRC message includes configuration information for acquiring a timing advance TA of a candidate cell, where the candidate cell is an LTM candidate cell; A first determining unit is used to determine a target LTM candidate cell among the LTM candidate cells, wherein the target LTM candidate cell is a candidate cell for which TA advance acquisition is to be performed; The first processing unit is used to initiate a TA acquisition process of the target LTM candidate cell or calculate the TA of the target LTM candidate cell according to the configuration information.

46. ​​The device for obtaining the timing advance according to claim 45, wherein: The configuration information includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; The LTM candidate cell is used for the preamble index of the TA to obtain in advance; The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA; Indication information of whether to perform terminal-based TA measurement.

47. The device for obtaining the timing advance according to claim 46, wherein: The first processing unit is used to send a target preamble code on a target random access channel opportunity; The target random access channel opportunity is the random access channel opportunity used by the target LTM candidate cell to extract TA acquisition, and / or the target preamble code is the preamble code corresponding to the preamble code index used by the target LTM candidate cell to obtain TA in advance.

48. The timing advance acquisition device according to claim 47, further comprising: The third processing unit is configured to perform at least one of the following after the second processing unit sends the target preamble code on the target random access channel opportunity: Monitor the random access response RAR sent by the target LTM candidate cell; Synchronize with the serving cell and monitor RAR; After receiving the RAR, resynchronize with the serving cell; receiving a first downlink message sent by a serving cell, wherein the first downlink message includes a TA of a target LTM candidate cell; The RAR includes the TA of the target LTM candidate cell.

49. The device for obtaining the timing advance according to claim 48, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

50. The device for obtaining the timing advance according to any one of claims 47 to 49, further comprising: The fourth processing unit is configured to perform downlink synchronization with the target LTM candidate cell before the first processing unit sends the target preamble code on the target random access channel opportunity.

51. The timing advance acquisition device according to claim 45, further comprising: The third sending unit is used to send a target message, where the target message is used to notify the serving cell of the valid state of the TA of the target LTM candidate cell.

52. A device for obtaining a timing advance, comprising: The first sending unit is used to send an RRC message, where the RRC message includes configuration information for acquiring a timing advance TA of a candidate cell, and the candidate cell is an LTM candidate cell.

53. The device for obtaining the timing advance according to claim 52, wherein: The configuration information includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; The LTM candidate cell is used for the preamble index of the TA to obtain in advance; The LTM candidate cell is used for the configuration related to the random access channel timing acquired in advance by the TA; Indication information of whether to perform terminal-based TA measurement.

54. The device for obtaining the timing advance according to claim 52, further comprising: A third acquisition unit, configured to acquire a TA sent by a target LTM candidate cell; The fourth sending unit is used to send a first downlink message to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

55. The device for obtaining the timing advance according to claim 54, wherein: The first downlink message is at least one of the following: Random access response RAR; Media access layer control unit MAC CE; RRC reconfiguration message.

56. The device for obtaining the timing advance according to claim 54 or 55, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

57. The timing advance acquisition device according to claim 52, further comprising: The fourth acquisition unit is used to acquire a target message, where the target message is used to notify the serving cell of the validity status of the TA of the target LTM candidate cell.

58. A device for obtaining a timing advance, comprising: A second determining unit is used to determine a target LTM candidate cell, where the target LTM candidate cell is a candidate cell for which TA early acquisition is to be performed; The second sending unit is used to send a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process for the target LTM candidate cell.

59. The device for obtaining the timing advance according to claim 58, wherein: The first uplink message includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; Synchronization signal / physical broadcast channel signal block SSB index; an L1 measurement result corresponding to the LTM candidate cell; Channel state information reference signal CSI-RS index; Beam related indication information; Request to obtain the instruction information of TA.

60. The timing advance acquisition device according to claim 58, further comprising: A monitoring unit, configured to monitor a PDCCH command sent by the network side device, wherein the PDCCH command includes a random access channel resource; a fifth sending unit, configured to send a preamble to a target LTM candidate cell according to the random access channel resources; The fifth acquisition unit is used to acquire a first downlink message, where the first downlink message includes a TA of a target LTM candidate cell.

61. The device for obtaining the timing advance according to claim 60, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

62. A device for obtaining a timing advance, comprising: A second acquisition unit, configured to acquire a first uplink message, where the first uplink message is used to request the network side to trigger a TA acquisition process of a target LTM candidate cell; The second processing unit is used to trigger the TA acquisition process of the target LTM candidate cell according to the first uplink message.

63. The device for obtaining the timing advance according to claim 62, wherein: The first uplink message includes at least one of the following: Conditional LTM configuration flag; Physical cell identifier PCI and / or frequency of the LTM candidate cell; Synchronization signal / physical broadcast channel signal block SSB index; an L1 measurement result corresponding to the LTM candidate cell; Channel state information reference signal CSI-RS index; Beam related indication information; Request to obtain the instruction information of TA.

64. The device for obtaining the timing advance according to claim 62, wherein: The second processing unit comprises: an acquisition subunit, configured to interact with a target LTM candidate cell according to the first uplink message to acquire a random access channel resource; The sending subunit is used to send a PDCCH command to the terminal, where the PDCCH command includes random access channel resources.

65. The device for obtaining the timing advance according to claim 64, characterized in that: Also includes: A sixth acquisition unit, configured to acquire a TA sent by a target LTM candidate cell; The sixth sending unit is used to send a first downlink message to the terminal, where the first downlink message includes the TA of the target LTM candidate cell.

66. The device for obtaining the timing advance according to claim 65, wherein: The first downlink message further includes at least one of the following: Conditional LTM configuration flag; PCI and / or frequency of the target LTM candidate cell.

67. A processor-readable storage medium, wherein the processor-readable storage medium stores a computer program, wherein the computer program is used to cause the processor to execute the steps of the method for obtaining the timing advance as described in any one of claims 1 to 7, or the steps of the method for obtaining the timing advance as described in any one of claims 8 to 13, or the steps of the method for obtaining the timing advance as described in any one of claims 14 to 17, or the steps of the method for obtaining the timing advance as described in any one of claims 18 to 22.

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