Method for acquiring timing advance, device, and storage medium

Abstract

Embodiments of the present application relate to fields such as communications technology and terminal technology, and provide a method for acquiring a timing advance (TA), a device, and a storage medium. The method comprises: a terminal device receiving first information, and, on the basis of the first information, initiating a random access procedure to at least one first cell, so as to acquire a TA of the at least one first cell. In this way, the purpose of enabling the terminal device to acquire, in advance, TAs of as many first cells as possible in conditional LTM is achieved, so that the probability of a RACH-less execution is increased, and the access delay of the terminal device is reduced.

Description

Timing advance acquisition method, device and storage medium

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on February 8, 2024, with application number 202410179453.9 and application name “Method, device and storage medium for obtaining timing advance”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to fields such as communication technology and terminal technology, and in particular to a method, device, and storage medium for obtaining a timing advance. Background Art

[0003] Currently, Layer 1 / L2-triggered mobility (LTM) has been introduced in New Radio (NR).

[0004] For conditional LTM, the terminal device needs to first obtain the timing advance (TA) of as many candidate cells as possible, then measure the relevant conditions on its own, and after determining that the relevant conditions are met, perform random access channel-less (RACH-less) switching based on the obtained TA.

[0005] Therefore, it becomes a technical problem that needs to be solved urgently for the terminal device to obtain the TA of as many cells as possible to reduce the access delay of the terminal device. Summary of the Invention

[0006] The embodiments of the present application provide a method, device, and storage medium for obtaining a timing advance, so that a terminal device can obtain the TA of as many cells as possible to reduce the access delay of the terminal device.

[0007] In a first aspect, an embodiment of the present application provides a method for obtaining a timing advance, which is applied to a terminal device. The method includes:

[0008] receiving a first message;

[0009] According to the first information, a random access procedure is initiated to at least one first cell to obtain a TA of the at least one first cell, where the at least one first cell includes a serving cell and / or a non-serving cell.

[0010] In an embodiment of the present application, the terminal device is triggered by the first information to initiate a random access process to at least one first cell to obtain the TA of at least one first cell, thereby achieving the purpose of obtaining the TA of as many first cells as possible in advance in the conditional LTM, increasing the probability of executing RACH-less, and reducing the access delay of the terminal device.

[0011] In an optional embodiment of the first aspect, initiating a random access procedure to at least one first cell includes:

[0012] A random access preamble is sent to the at least one first cell.

[0013] In an optional embodiment of the first aspect, the first information includes one or more of the following:

[0014] A first indication is used to trigger the terminal device to initiate the random access process;

[0015] Identification related information, used to indicate the at least one first cell;

[0016] Preamble code related information, used to indicate the random access preamble code related to the random access procedure;

[0017] Timing Advance Timer (TAT) related information is used to indicate the effective duration of the TA.

[0018] In an optional embodiment of the first aspect, the identification-related information includes one or more of the following:

[0019] a related identifier of the at least one first cell;

[0020] an identifier of at least one target group;

[0021] Identifies a related list.

[0022] In an optional embodiment of the first aspect, the relevant identifier is any one of the following:

[0023] Cell unique identifier ID;

[0024] Mobility LTM configuration flag triggered by the lower layer;

[0025] Physical cell identifier PCI.

[0026] In an optional embodiment of the first aspect, the identifier of the at least one target group is any one of the following:

[0027] an identifier of at least one cell group in which the at least one first cell is located;

[0028] an identifier of at least one centralized unit CU corresponding to the at least one first cell;

[0029] An identifier of at least one distributed unit DU corresponding to the at least one first cell.

[0030] In an optional embodiment of the first aspect, the preamble-related information includes one or more of the following:

[0031] at least one random access preamble;

[0032] A list of at least one random access preamble.

[0033] In an optional embodiment of the first aspect, the TAT-related information includes one or more of the following:

[0034] First TAT;

[0035] at least one second TAT, the at least one second TAT corresponding to the at least one first cell;

[0036] At least one third TAT, the at least one third TAT corresponding to at least one target packet.

[0037] In an optional embodiment of the first aspect, after sending a random access preamble to the at least one first cell, if a TA of the at least one first cell is acquired, a first TAT is started; or

[0038] After sending the random access preamble code to the at least one first cell, for each first cell, if the TA of the first cell is acquired, the second TAT corresponding to the first cell is started.

[0039] In an optional embodiment of the first aspect, sending a random access preamble to at least one first cell includes:

[0040] Send a random access preamble code to the at least one first cell according to the random access related configuration information.

[0041] In an optional embodiment of the first aspect, the random access-related configuration information includes one or more of the following:

[0042] frequency information of at least one cell, wherein the at least one cell includes the at least one first cell;

[0043] a first random access channel (RACH) related configuration of at least one cell, where the first RACH related configuration is used by the terminal device to receive reply information, where the reply information includes a TA;

[0044] an identifier of the group to which at least one cell belongs;

[0045] a first period of at least one cell;

[0046] A first time window of at least one cell.

[0047] In an optional embodiment of the first aspect, the first period of the cell is:

[0048] The duration of sending a random access preamble to the cell at least once; or

[0049] After sending a random access preamble to the cell, the duration of time during which a random access preamble is no longer sent to the cell; or

[0050] The reset duration of the synchronization period timer is used to send a random access preamble code to the cell once the synchronization period timer expires.

[0051] In an optional embodiment of the first aspect, the first time window of the cell is a time period occupied by sending a random access preamble code to the cell, or a time period occupied by sending a random access preamble code to the at least one cell.

[0052] In an optional embodiment of the first aspect, the random access-related configuration information includes one or more of the following:

[0053] The second RACH related configuration is used for the terminal device to receive reply information, where the reply information includes a TA;

[0054] Second cycle;

[0055] Second time window.

[0056] In an optional embodiment of the first aspect, the second period is:

[0057] a duration occupied by sending a random access preamble code at least once to the at least one first cell; or

[0058] After sending the random access preamble to the at least one first cell, the duration of not sending the random access preamble to the at least one first cell; or,

[0059] The reset duration of the synchronization period timer is used to send a random access preamble code to the at least one first cell once when the synchronization period timer times out.

[0060] In an optional embodiment of the first aspect, the second time window is a time period occupied by sending a random access preamble code to the at least one first cell after receiving the first information.

[0061] In an optional embodiment of the first aspect, acquiring the TA of the at least one first cell includes:

[0062] At least one reply message is received, where the at least one reply message includes the TA of the at least one first cell.

[0063] In an optional embodiment of the first aspect, the at least one reply message further includes a fourth TAT corresponding to the at least one first cell.

[0064] In a second aspect, an embodiment of the present application provides a method for obtaining a timing advance, which is applied to a network-side device, including:

[0065] First information is sent to a terminal device, where the first information is used by the terminal device to initiate a random access process to at least one first cell to obtain a TA of the at least one first cell.

[0066] In an optional embodiment of the second aspect, the method further includes:

[0067] Random access related configuration information is sent to the terminal device, where the random access related configuration information is used by the terminal device to send a random access preamble code to the at least one first cell.

[0068] In a third aspect, an embodiment of the present application provides a terminal device, including:

[0069] A receiving module, configured to receive first information;

[0070] a sending module configured to initiate a random access procedure to at least one first cell according to the first information to obtain a TA of the at least one first cell, wherein the at least one first cell includes a serving cell and / or a non-serving cell

[0071] In an optional embodiment of the third aspect, the sending module is specifically used to: send a random access preamble code to the at least one first cell.

[0072] In an optional embodiment of the third aspect, the first information includes one or more of the following:

[0073] A first indication is used to trigger the terminal device to initiate the random access process;

[0074] Identification related information, used to indicate the at least one first cell;

[0075] Preamble code related information, used to indicate the random access preamble code related to the random access procedure;

[0076] Timing Advance Timer (TAT) related information is used to indicate the effective duration of the TA.

[0077] In an optional embodiment of the third aspect, the identification-related information includes one or more of the following:

[0078] a related identifier of the at least one first cell;

[0079] an identifier of at least one target group;

[0080] Identifies a related list.

[0081] In an optional embodiment of the third aspect, the relevant identifier is any one of the following:

[0082] Cell unique identifier ID;

[0083] Mobility LTM configuration flag triggered by the lower layer;

[0084] Physical cell identifier PCI.

[0085] In an optional embodiment of the third aspect, the identifier of the at least one target group is any one of the following:

[0086] an identifier of at least one cell group in which the at least one first cell is located;

[0087] an identifier of at least one centralized unit CU corresponding to the at least one first cell;

[0088] An identifier of at least one distributed unit DU corresponding to the at least one first cell.

[0089] In an optional embodiment of the third aspect, the preamble-related information includes one or more of the following:

[0090] at least one random access preamble;

[0091] A list of at least one random access preamble.

[0092] In an optional embodiment of the third aspect, the TAT-related information includes one or more of the following:

[0093] First TAT;

[0094] at least one second TAT, the at least one second TAT corresponding to the at least one first cell;

[0095] At least one third TAT, the at least one third TAT corresponding to at least one target packet.

[0096] In an optional embodiment of the third aspect, after sending a random access preamble to the at least one first cell, if a TA of the at least one first cell is acquired, a first TAT is started; or

[0097] After sending the random access preamble code to the at least one first cell, for each first cell, if the TA of the first cell is acquired, the second TAT corresponding to the first cell is started.

[0098] In an optional embodiment of the third aspect, the sending module is specifically configured to:

[0099] Send a random access preamble code to the at least one first cell according to the random access related configuration information.

[0100] In an optional embodiment of the third aspect, the random access-related configuration information includes one or more of the following:

[0101] frequency information of at least one cell, wherein the at least one cell includes the at least one first cell;

[0102] a first random access channel (RACH) related configuration of at least one cell, where the first RACH related configuration is used by the terminal device to receive reply information, where the reply information includes a TA;

[0103] an identifier of the group to which at least one cell belongs;

[0104] a first period of at least one cell;

[0105] A first time window of at least one cell.

[0106] In an optional embodiment of the third aspect, the first period of the cell is:

[0107] The duration of sending a random access preamble to the cell at least once; or

[0108] After sending a random access preamble to the cell, the duration of time during which a random access preamble is no longer sent to the cell; or

[0109] The reset duration of the synchronization period timer is used to send a random access preamble code to the cell once the synchronization period timer expires.

[0110] In an optional embodiment of the third aspect, the first time window of the cell is a time period occupied by sending a random access preamble code to the cell, or a time period occupied by sending a random access preamble code to the at least one cell.

[0111] In an optional embodiment of the third aspect, the random access-related configuration information includes one or more of the following:

[0112] The second RACH related configuration is used for the terminal device to receive reply information, where the reply information includes a TA;

[0113] Second cycle;

[0114] Second time window.

[0115] In an optional embodiment of the third aspect, the second period is:

[0116] a duration occupied by sending a random access preamble code at least once to the at least one first cell; or

[0117] After sending the random access preamble to the at least one first cell, the duration of not sending the random access preamble to the at least one first cell; or,

[0118] The reset duration of the synchronization period timer is used to send a random access preamble code to the at least one first cell once when the synchronization period timer times out.

[0119] In an optional embodiment of the third aspect, the second time window is a time period occupied by sending a random access preamble code to the at least one first cell after receiving the first information.

[0120] In an optional embodiment of the third aspect, the receiving module is further configured to:

[0121] At least one reply message is received, where the at least one reply message includes the TA of the at least one first cell.

[0122] In an optional embodiment of the third aspect, the at least one reply message further includes a fourth TAT corresponding to the at least one first cell.

[0123] In a fourth aspect, an embodiment of the present application provides a network-side device, including:

[0124] The sending module is used to send first information to the terminal device, where the first information is used by the terminal device to initiate a random access process to at least one first cell to obtain the TA of the at least one first cell.

[0125] In an optional embodiment of the fourth aspect, the sending module is further configured to:

[0126] Random access related configuration information is sent to the terminal device, where the random access related configuration information is used by the terminal device to send a random access preamble code to the at least one first cell.

[0127] In a fifth aspect, an embodiment of the present application provides a terminal device, including: a processor and a memory;

[0128] Memory stores computer-executable instructions;

[0129] The processor executes the computer-executable instructions stored in the memory, so that the terminal device executes the method described in the first aspect or any optional embodiment of the first aspect.

[0130] In a sixth aspect, an embodiment of the present application provides a network-side device, including: a processor and a memory;

[0131] Memory stores computer-executable instructions;

[0132] The processor executes the computer-executable instructions stored in the memory, so that the network-side device executes the method described in any two optional embodiments of the second aspect or the first aspect.

[0133] In a seventh aspect, embodiments of the present application provide a computer-readable storage medium storing a computer program. When executed by a processor, the computer program implements the method described in the first aspect or any optional embodiment of the first aspect, or the method described in the second aspect or any optional embodiment of the second aspect.

[0134] In an eighth aspect, an embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is run, it enables the computer to execute the method described in the first aspect or any one of the optional embodiments of the first aspect, or execute the method described in the second aspect or any one of the optional embodiments of the second aspect.

[0135] In a ninth aspect, an embodiment of the present application provides a chip or chip system, comprising at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected via a line, and the at least one processor is configured to run a computer program or instruction to execute the method described in the first aspect or any one of the optional embodiments of the first aspect, or the method described in the second aspect or any one of the optional embodiments of the second aspect, wherein the communication interface in the chip may be an input / output interface, a pin, or a circuit, etc.

[0136] In one possible implementation, the chip or chip system described above in the embodiments of the present application further includes at least one memory, in which instructions are stored. The memory may be a storage unit within the chip, such as a register, a cache, etc., or a storage unit of the chip (e.g., a read-only memory, a random access memory, etc.).

[0137] It should be understood that the second to ninth aspects of the present application correspond to the technical solutions of the first aspect of the present application, and the beneficial effects achieved by each aspect and the corresponding feasible embodiments are similar and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0138] FIG1 is a diagram of a communication system architecture provided by an embodiment of the present application;

[0139] FIG2 is a first schematic diagram of a method for obtaining a timing advance according to an embodiment of the present application;

[0140] FIG3 is a second schematic diagram of a method for obtaining a timing advance according to an embodiment of the present application;

[0141] FIG4 is a third schematic diagram of a method for obtaining a timing advance according to an embodiment of the present application;

[0142] FIG5 is a first structural diagram of a terminal device provided in an embodiment of the present application;

[0143] FIG6 is a second structural diagram of a terminal device provided in an embodiment of the present application;

[0144] FIG7 is a schematic diagram of a structure of a network side device according to an embodiment of the present application;

[0145] FIG8 is a second schematic diagram of the structure of the network side device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0146] To facilitate a clear description of the technical solutions of the embodiments of this application, the words "exemplary" or "for example" are used in the embodiments of this application to indicate examples, illustrations, or explanations. Any embodiment or design described in this application as "exemplary" or "for example" should not be interpreted 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.

[0147] In the embodiments of the present application, "at least one" refers to one or more, and "more" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: the existence of A alone, the existence of A and B at the same time, and the existence of B alone, where A and B can be singular or plural. The character " / " generally indicates that the previous and next associated objects are in an "or" relationship. "At least one of the following items" or similar expressions refers to any combination of these items, including any combination of single items or plural items. For example, at least one of a, b, or c can represent: a, b, c, ab, a--c, bc, or abc, where a, b, c can be single or multiple.

[0148] In the embodiments of this application, terms such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. For example, the terms "first chip" and "second chip" are used solely to distinguish between different chips and do not define their order. Those skilled in the art will understand that terms such as "first" and "second" do not define the quantity or execution order, and do not necessarily define differences.

[0149] It should be noted that the phrase "when (at) ..." or "when (in) ..." in the embodiments of the present application can refer to the instant when a certain situation occurs or a period of time after the situation occurs, and the embodiments of the present application do not specifically limit this. In addition, the display interface provided in the embodiments of the present application is only an example, and the display interface may also include more or less content.

[0150] The following is a brief description of the terms and nouns involved in the embodiments of this application.

[0151] The random access process (RACH process) is the first step for a terminal device to access the network. The process by which a terminal device performs uplink synchronization and establishes a radio resource control (RRC) connection based on the radio status is called the RACH process.

[0152] Timing Advance (TA): It is the offset between the start time of the downlink subframe received by the terminal device and the time of transmitting the uplink subframe.

[0153] Time Alignment Timer (TAT): used to set the effective time of the timing TA.

[0154] Distributed Unit (DU): Used in network-side equipment to process physical layer protocols and real-time services.

[0155] Centralized Unit (CU): Used in network-side equipment to process non-real-time protocols and services. A CU can control at least one DU.

[0156] In order to better understand the method for obtaining the timing advance provided in the embodiment of the present application, the communication system architecture of the embodiment of the present application is described in conjunction with Figure 1.

[0157] For example, Figure 1 is a diagram of the communication system architecture provided by an embodiment of the present application. As shown in Figure 1, the communication system 100 includes a terminal device 101 and a network side device 102. The terminal device 101 communicates wirelessly with the network side device 102.

[0158] The terminal device 101 involved in the embodiment of the present application can also be called a terminal, which can be a device with wireless transceiver function, which can be deployed on land (including indoor or outdoor, handheld or vehicle-mounted), on the water (such as a ship, etc.), or in the air (such as an airplane, a balloon, and a satellite, etc.). The terminal device can be a user equipment (UE), wherein the UE includes a handheld device, a vehicle-mounted device, a wearable device, or a computing device with a wireless communication function. Exemplarily, the UE can be a mobile phone, a tablet computer, or a computer with a wireless transceiver function. The terminal device can also be a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal in industrial control, a wireless terminal in unmanned driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. In the embodiment of the present application, the device for realizing the function of the terminal can be a terminal; it can also be a device that can support the terminal to realize the function, such as a chip system, which can be installed in the terminal.

[0159] The network side device 102 involved in the embodiment of the present application includes an access network device 1021 and a core network device 1022.

[0160] Access network (RAN) equipment is the intermediate device that connects terminals to core network equipment wirelessly. It is primarily responsible for radio resource management, quality of service (QoS) management, data compression and encryption, etc. on the air interface side. Examples include NodeBs, evolved eNodeBs, base stations in 5G mobile communication systems or next-generation radio (NR) communication systems, and base stations in future mobile communication systems.

[0161] Core network (CN) equipment includes user plane function (UPF) network elements, access and mobility management function (AMF) network elements, session management function (SMF) network elements, policy control function (PCF) network elements, etc. Among them, the UPF network element is mainly responsible for the transmission of user data, while the other network elements can be called control plane function network elements, which are mainly responsible for authentication, authorization, registration management, session management, mobility management, and policy control to ensure the reliable and stable transmission of user data.

[0162] In an embodiment of the present application, the device for implementing the function of the network side device can be a network side device, or it can be a device that can support the network side device to implement the function, such as a chip system, which can be installed in the network side device.

[0163] The technical solutions provided in the embodiments of the present application can be applied to the Long Term Evolution (LTE) architecture, and can also be applied to the Universal Mobile Telecommunications System (UMTS) Terrestrial Radio Access Network (UTRAN) architecture, or the Global System for Mobile Communication (GSM) / Enhanced Data Rate for GSM Evolution (EDGE) system Radio Access Network (GSM EDGE Radio Access Network, GERAN) architecture. In addition, the technical solutions provided in the embodiments of the present application can also be applied to any other wireless communication system with similar structure and function, such as the Public Land Mobile Network (PLMN) system, the 5G communication system or the communication system after 5G, etc., and the embodiments of the present application do not impose any restrictions on this.

[0164] Wireless communication between communication devices may include: wireless communication between network-side devices and terminals, wireless communication between network-side devices and network-side devices, and wireless communication between terminals. In the embodiments of the present application, the term "wireless communication" may also be referred to as "communication", and the term "communication" may also be described as "data transmission", "information transmission" or "transmission". Those skilled in the art may apply the technical solutions provided in the embodiments of the present application to wireless communication between network-side devices and terminals, such as wireless communication between access network devices and terminals, and wireless communication between core network devices and terminals.

[0165] In an embodiment of the present application, a terminal or network-side device includes a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also known as main memory). The operating system can be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as browsers, address books, word processing software, and instant messaging software.

[0166] Layer 1 or Layer 2 triggered mobility (L1 / L2-triggered mobility, LTM) is introduced in New Radio (NR). For LTM, the serving cell triggers the terminal device to send a random access preamble to the candidate cell. After the candidate cell determines the timing advance (TA), it sends the TA to the serving cell. When the serving cell sends a handover command to the terminal device, it brings the TA of the target candidate cell to the terminal device. For the cell change mechanism (such as conditional LTM, which can also be called conditional LTM, terminal-triggered LTM, etc.), the terminal device needs to first obtain the timing advance (TA) of as many candidate cells as possible, and then measure the relevant conditions by itself. After determining that the relevant conditions are met, it performs random access channel-less (RACH-less) handover based on the obtained TA. Therefore, how the terminal device initiates the random access process and obtains the cell's TA first has become a technical problem that needs to be solved urgently. In this regard, an embodiment of the present application provides a method for obtaining a timing advance, and its main inventive idea is as follows: the network side device can send a first message to trigger the terminal device to initiate a random access process to at least one first cell, so that the terminal device can obtain the TA of at least one first cell in advance.

[0167] The technical solutions shown in this application are described in detail below through specific embodiments. It should be noted that the following embodiments can exist independently or in combination with each other. For the same or similar content, such as the explanation of terms or nouns, and the explanation of steps, etc., different embodiments can refer to each other and will not be repeated.

[0168] FIG2 is a schematic diagram of a method for obtaining a timing advance according to an embodiment of the present application. As shown in FIG2 , the method for obtaining a timing advance includes:

[0169] S201. The network side device sends first information to the terminal device.

[0170] The first information is used to instruct the terminal device to initiate a random access process to obtain the TA in advance.

[0171] In an optional embodiment of the present application, the first information is carried on layer 1 signaling and / or layer 2 signaling. Exemplarily, the layer 1 signaling is downlink control information (DCI), and the layer 2 signaling is a medium access control element (MAC CE).

[0172] When the layer 1 signaling is DCI, the layer 1 signaling may be a physical downlink control channel (PDCCH) order.

[0173] S202. The terminal device initiates a random access process to at least one first cell according to the first information to obtain the TA of the at least one first cell, where the at least one first cell includes a serving cell and / or a non-serving cell.

[0174] The first information includes a first indication and / or identity-related information. The first indication is used to trigger the terminal device to initiate a random access procedure. The identity-related information is used to indicate at least one first cell.

[0175] Exemplarily, the first information does not include identity-related information, and at least one first cell is a preconfigured cell.

[0176] Exemplarily, the first information includes identification-related information, and the at least one first cell is a cell indicated by the identification-related information.

[0177] The following explains S202 in conjunction with some aspects of the first information:

[0178] (11) The first information includes a first indication (ie, the first information is a first indication). After receiving the first indication, the terminal device initiates a random access procedure to the pre-configured cell.

[0179] In an optional embodiment of the present application, initiating a random access procedure to a preconfigured cell includes:

[0180] The terminal device randomly selects a random access preamble from a plurality of random access preambles and sends the selected random access preamble to the preconfigured cell, wherein the plurality of random access preambles may be random access preambles indicated by 0 to 63; or,

[0181] The terminal device sends a random access preamble code configured by the network side device to the preconfigured cell.

[0182] If the network side device is not configured with a random access preamble or the corresponding position of the PDCCH is set to 000000, and contention-based random access (CBRA) is triggered, the terminal device randomly selects a random access preamble from multiple random access preambles.

[0183] When non-contention random access (CFRA) is triggered, the random access preamble configured by the network side device can be carried through the PDCCH order or RRC.

[0184] (12) The first information includes the identifier-related information, or the identifier-related information and the first indication. In this case, the at least one first cell is the cell indicated by the identifier-related information. The terminal device initiates a random access procedure to the cell indicated by the identifier-related information; or, based on the first indication, initiates a random access procedure to the cell indicated by the identifier-related information.

[0185] Exemplarily, the first indication may be 1 bit.

[0186] Exemplarily, the at least one first cell may be a cell indicated by the first information, and also a cell preconfigured by the network side device for the terminal device. Exemplarily, in a layer-triggered mobility management (L1 / L2 triggered mobility, LTM) system, the preconfigured cell is a candidate cell.

[0187] In an optional embodiment of the present application, initiating a random access procedure to at least one first cell includes: sending a random access preamble to the at least one first cell. The random access preamble is used to calculate a TA for the corresponding first cell.

[0188] In an embodiment of the present application, the terminal device is triggered by the first information to initiate a random access process to at least one first cell to obtain the TA of at least one first cell, thereby achieving the purpose of obtaining the TA of as many first cells as possible in advance in the conditional LTM, increasing the probability of executing RACH-less, and reducing the access delay of the terminal device.

[0189] Based on the above embodiment, the method for obtaining the timing advance provided by the present application is described in detail below with reference to FIG3 .

[0190] FIG3 is a second schematic diagram of a method for obtaining a timing advance provided in an embodiment of the present application. As shown in FIG3 , the method for obtaining a timing advance includes:

[0191] S301. The terminal device sends device capability information to the network device.

[0192] In an optional embodiment, the device capability information includes one or more of the following:

[0193] The second indication indicates whether the terminal device can obtain the TA in advance;

[0194] The number K of cells capable of calculating TA is a natural number greater than 0.

[0195] S302: The network side device sends random access related configuration information to the terminal device.

[0196] In an optional embodiment, the network side device determines whether the terminal device can obtain the TA in advance based on the second indication of the device capability information, and if it is determined that the terminal device can obtain the TA in advance, sends random access related configuration information to the terminal device.

[0197] The random access related configuration information is the configuration information in the following case 1 or case 2.

[0198] Case 1: The random access related configuration information may include configuration information of different cells. In an optional embodiment, the random access related configuration information includes one or more of the following:

[0199] frequency information of at least one cell, the at least one cell including at least one first cell;

[0200] a first random access channel (RACH)-related configuration of at least one cell, where the first RACH-related configuration is used for a terminal device to receive reply information, where the reply information includes a TA;

[0201] an identifier of the group to which at least one cell belongs;

[0202] a first period of at least one cell;

[0203] A first time window of at least one cell.

[0204] The number of at least one cell may be less than or equal to K.

[0205] The frequency information of a cell is a basic parameter of an uplink carrier used to send a random access preamble to the cell.

[0206] Among them, the first RACH related configuration of the cell may include the time domain, frequency domain, code domain position sent by PRACH (prach-ConfigurationIndex, msg1-FDM, msg1-FrequencyStart, etc.), reference signal related information (SSB or CSI-RS related information), random access response (Random Access Response, RAR) window (ra-ResponseWindow), power related information (powerRampingStep), etc.

[0207] The identifier of the group to which the cell belongs may be the identifier of the cell group to which the cell belongs, the identifier of the CU corresponding to the cell, or the identifier of the DU corresponding to the cell.

[0208] The first period may be a time interval for sending a random access preamble code, or a time interval for triggering a random access procedure.

[0209] In an optional embodiment, the first period of the cell is:

[0210] (21) The duration of sending the random access preamble to the cell at least once; or

[0211] (22) After sending a random access preamble to the cell, the duration of time during which no more random access preambles are sent to the cell; or

[0212] (23) The reset duration of the synchronization period timer. When the synchronization period timer expires, a random access preamble code is sent to the cell once.

[0213] Among them, (21) can indicate that for each first period, a random access preamble code is sent to the cell at least once in the first period.

[0214] Among them, (22) can mean that after sending a random access preamble code to a cell at least once, a random access preamble code will no longer be sent to the cell within the first cycle of the cell, and after the first cycle of the cell, a random access preamble code can be sent to the cell at least once.

[0215] Among them, (23) can indicate that the timing duration of the synchronization cycle timer is set to the first cycle of the cell. When the synchronization cycle timer times out, a random access preamble code is sent to the cell at least once, and then the timing duration of the synchronization cycle timer is set to the first cycle of the cell, and the process is repeated.

[0216] In an optional embodiment, the first time window of a cell is a time period occupied by sending a random access preamble to the cell, or a time period occupied by sending a random access preamble to at least one cell.

[0217] Exemplarily, when the first time windows of at least one cell are different, the first time window of a cell is a time period occupied by sending a random access preamble code to the cell.

[0218] Exemplarily, when the first time windows of at least one cell are the same, a random access preamble code is sent to the at least one cell in the first time window.

[0219] In case 2, the random access related configuration information may be configuration information for different terminal devices, that is, different terminal devices may have different corresponding random access related configuration information. In an optional embodiment, the random access related configuration information includes one or more of the following:

[0220] The second RACH related configuration is used for the terminal device to receive reply information, where the reply information includes a TA;

[0221] Second cycle;

[0222] Second time window.

[0223] Optionally, the second RACH-related configuration may be similar to the first RACH-related configuration, and details thereof will not be repeated here.

[0224] Optionally, the second period may be a time interval for sending a random access preamble code, or a time interval for triggering a random access procedure.

[0225] In an optional embodiment, the second cycle is:

[0226] (31) the duration of sending a random access preamble code to at least one first cell at least once; or

[0227] (32) After sending a random access preamble to at least one first cell, the duration of time during which the random access preamble is no longer sent to at least one first cell; or

[0228] (33) The reset duration of the synchronization period timer. When the synchronization period timer times out, a random access preamble code is sent to at least one first cell once.

[0229] Among them, (31) can indicate that for each second period, a random access preamble code is sent to at least one first cell at least once in the second period.

[0230] Among them, (32) can mean that after sending a random access preamble code to at least one first cell, a random access preamble code is no longer sent to at least one first cell in the second period, and after the second period, a random access preamble code can be sent to at least one first cell at least once.

[0231] Among them, (33) can indicate that the timing duration of the synchronization cycle timer is set to the second period, and when the synchronization cycle timer times out, a random access preamble code is sent to at least one first cell at least once, and then the timing duration of the synchronization cycle timer is set to the second period, and repeated.

[0232] In an optional embodiment of the present application, the second time window is a period of time occupied by sending a random access preamble code to at least one first cell after receiving the first information.

[0233] Here, sending once means sending once to at least one first cell, or sending once to one first cell.

[0234] In an embodiment of the present application, when the network side device determines that the terminal device can obtain the TA in advance based on the device capability information, it independently configures the random access related configuration information to achieve the flexibility of configuring the first RACH related configuration and the second RACH related configuration.

[0235] S303: The network-side device sends first information to the terminal device.

[0236] In an optional embodiment of the present application, the first information includes one or more of the following:

[0237] The first indication is used to trigger the terminal device to initiate a random access process;

[0238] Identification related information, used to indicate at least one first cell;

[0239] Preamble-related information, used to indicate a random access preamble related to a random access procedure, where the random access preamble is a preamble sent to at least one first cell;

[0240] Timing Advance Timer (TAT) related information is used to indicate the effective duration of the TA.

[0241] In an optional embodiment of the present application, the identification related information includes one or more of the following:

[0242] an identifier related to at least one first cell;

[0243] an identifier of at least one target group;

[0244] Identifies a related list.

[0245] In an optional embodiment of the present application, the relevant identifier of the first cell is one or more of the following:

[0246] Cell unique identifier (Cell ID);

[0247] Low-layer triggered mobility (L1 / L2-triggered mobility, LTM) configuration identifier;

[0248] Physical Cell Identifier (PCI).

[0249] The LTM configuration identity may also be referred to as an LTM candidate configuration identity.

[0250] Among them, at least one target group corresponds to at least one first cell.

[0251] The target group may be a cell group, a centralized unit (CU) or a distributed unit (DU), etc.

[0252] The following takes a target group as an example to illustrate the relationship between the target group and at least one first cell:

[0253] (41) The target group is a cell group, and at least one first cell is a cell in the cell group.

[0254] (42) The target group is a CU, and at least one first cell is a cell corresponding to the CU.

[0255] (43) The target group is a DU, and at least one first cell is a cell corresponding to the DU.

[0256] In an optional embodiment of the present application, the identifier of at least one target group is any one of the following:

[0257] an identifier of at least one cell group in which the at least one first cell is located;

[0258] an identifier of at least one CU corresponding to at least one first cell;

[0259] An identifier of at least one DU corresponding to at least one first cell.

[0260] In an optional embodiment of the present application, the identification-related list may include one or more of the following:

[0261] an identifier related to at least one first cell;

[0262] an identifier of at least one cell group;

[0263] The identifier of at least one CU;

[0264] The identifier of at least one DU.

[0265] In an optional embodiment of the present application, the preamble-related information includes one or more of the following:

[0266] at least one random access preamble;

[0267] A list of at least one random access preamble.

[0268] The number M of at least one random access preamble code may be equal to or different from the number N of at least one first cell.

[0269] Exemplarily, when M=N, each first cell corresponds to a random access preamble code.

[0270] Exemplarily, when M≠N, M>N or M<N. Exemplarily, when M>N, there are multiple first cells corresponding to one random access preamble. Exemplarily, when M<N, there is one first cell corresponding to multiple random access preambles.

[0271] Optionally, the TAT-related information may be the TAT-related information in the following manner 1 or manner 2.

[0272] Method 1: The TAT-related information may include one or more of the following:

[0273] First TAT;

[0274] at least one second TAT, the at least one second TAT corresponding to the at least one first cell;

[0275] At least one third TAT, the at least one third TAT corresponding to at least one target packet.

[0276] Method 2: TAT-related information includes one or more of the following:

[0277] First TAT duration;

[0278] At least one second TAT duration, where the at least one second TAT duration corresponds to the at least one first cell;

[0279] At least one third TAT duration, where the at least one third TAT duration corresponds to at least one target group.

[0280] In an optional embodiment of the present application, after sending a random access preamble to at least one first cell, if a TA of each first cell is obtained, a first TAT is started; or,

[0281] After sending a random access preamble to at least one first cell, for each first cell, if the TA of the first cell is obtained, starting a second TAT corresponding to the first cell; or,

[0282] For each target group, after sending a random access preamble code to a cell in the target group (including at least one first cell) or sending a random access preamble code to at least one first cell, if the TA corresponding to the target group is obtained, the third TAT corresponding to the target group is started.

[0283] The duration of the first TAT is the first TAT duration, the duration of the second TAT is the corresponding second TAT duration, and the duration of the third TAT is the corresponding third TAT duration.

[0284] TAT can be a timer or a timer. Initiation in this application includes starting or restarting a timer.

[0285] In an embodiment of the present application, the network-side device can autonomously configure the first information to include timing advance timer TAT-related information, thereby improving the flexibility of configuring TAT-related information.

[0286] S304. The terminal device initiates a random access process to at least one first cell according to the first information to obtain the TA of the at least one first cell, where the at least one first cell includes a serving cell and / or a non-serving cell.

[0287] In an optional embodiment of the present application, initiating a random access procedure to at least one first cell includes: sending a random access preamble code to the at least one first cell according to random access related configuration information.

[0288] Based on case 1, the following describes sending a random access preamble to at least one first cell according to the random access related configuration information in combination with some cases of the first information and the random access related configuration information:

[0289] (51) The first information includes a first indication and preamble-related information (for example, at least one random access preamble), and the random access-related configuration information includes frequency information of at least one cell and a first period (for example, 21).

[0290] The terminal device determines the frequency information and the first period of at least one first cell (pre-configured cell) in the random access related configuration information; for each first cell, the terminal device takes the receipt of the first information as the starting moment, uses the frequency information of the first cell, and sends the random access preamble code corresponding to the first cell to at least the first cell within the first period of the first cell.

[0291] (52) The first information includes a first indication and preamble-related information (for example, at least one random access preamble), and the random access-related configuration information includes frequency information, a first period, and a first time window of at least one cell.

[0292] The terminal device determines the frequency information, first period and first time window of at least one first cell (pre-configured cell) in the random access related configuration information; for each first cell, the terminal device takes the receipt of the first information as the starting moment, uses the frequency information of the first cell, and within the first time window of the first cell, according to the first period, periodically sends at least the random access preamble code corresponding to the first cell to the first cell.

[0293] Exemplarily, the first time window is 3 seconds. If the first period is 1 second, the terminal device can at least send the random access preamble code corresponding to the first cell to the first cell within the 1st second of the first time window, at least send the random access preamble code corresponding to the first cell to the first cell within the 2nd second of the first time window, and at least send the random access preamble code corresponding to the first cell to the first cell within the 3rd second of the first time window.

[0294] (53) The first information includes a first indication and preamble-related information (for example, at least one random access preamble), and the random access-related configuration information includes frequency information of at least one cell and a first time window.

[0295] The terminal device determines frequency information and a first time window of at least one first cell (pre-configured cell) in the random access related configuration information;

[0296] When the first time windows of at least one cell are different, for each first cell, the terminal device uses the frequency information of the first cell, taking the receipt of the first information as the starting moment, and sends the random access preamble code corresponding to the first cell to the first cell at least once within the first time window of the first cell; or

[0297] When the first time windows of at least one cell are the same, the terminal device takes the receipt of the first information as the starting moment, uses the frequency information of each first cell, and sends the random access preamble code corresponding to the first cell to the corresponding first cell at least once in the first time window.

[0298] (54) The first information includes a first indication, identifier-related information (e.g., including the identifier of at least one first cell) and preamble-related information (e.g., including at least one random access preamble), and the random access-related configuration information includes frequency information and a first period of at least one cell.

[0299] The terminal device determines, according to the relevant identifier of the at least one first cell, the frequency information and the first period of the first cell of the at least one first cell in the random access related configuration information;

[0300] When the first periods of at least one first cell are different, for each first cell, with the receipt of the first information as the starting moment, at least a random access preamble code corresponding to the first cell is sent to the first cell within the first period of the first cell; or

[0301] When the first periods of at least one first cell are the same, with the receipt of the first information as the starting moment, a corresponding random access preamble code is sent to each first cell at least once within the first period.

[0302] (55) The first information includes a first indication, identification-related information (for example, including the identification of at least one target group) and preamble-related information, and the random access-related configuration information includes frequency information of at least one cell, the identification of the group to which at least one cell belongs and the first period.

[0303] The terminal device determines at least one first cell according to an identifier of at least one target group and an identifier of a group to which at least one cell belongs; and determines frequency information and a first period of the at least one first cell in the random access-related configuration information;

[0304] When the first periods of at least one first cell are different, for each first cell, with the receipt of the first information as the starting moment, at least a random access preamble code corresponding to the first cell is sent to the first cell within the first period of the first cell; or

[0305] When the first periods of at least one first cell are the same, with the receipt of the first information as the starting moment, a corresponding random access preamble code is sent to each first cell at least once within the first period.

[0306] Exemplarily, the terminal device determines at least one first cell based on the identifier of at least one target group and the identifier of the group to which at least one cell belongs, including: determining a cell whose identifier of the group to which at least one cell belongs is the identifier of the target group as the at least one first cell.

[0307] Exemplarily, the identifier of at least one target group includes Z1 and Z2, and at least one cell includes Cell 1 (the identifier of the group to which it belongs is Z1), Cell 2 (the identifier of the group to which it belongs is Z2), Cell 3 (the identifier of the group to which it belongs is Z1), and Cell 4 (the identifier of the group to which it belongs is Z3), then Cell 1, Cell 2, and Cell 3 are determined as at least one first cell.

[0308] In an embodiment of the present application, the first information includes an identifier of at least one target group, which can trigger the terminal device to obtain the TA corresponding to the target group in group form, reduce signaling overhead, and reduce the delay in obtaining the TA of at least one first cell.

[0309] Based on case 2, the following describes sending a random access preamble to at least one first cell according to the random access related configuration information in combination with some cases of the first information and the random access related configuration information:

[0310] (61) The first information includes a first indication and preamble-related information (for example, including at least one random access preamble, at least one random access preamble corresponding to at least one first cell, that is, one random access preamble corresponds to one first cell), and the random access-related configuration information includes a second period (for example, 31).

[0311] During the second period, the terminal device sends a corresponding random access preamble code to at least one first cell (pre-configured cell) at least once.

[0312] (62) The first information includes a first indication and preamble-related information (for example, including at least one random access preamble, at least one random access preamble corresponding to at least one first cell), and the random access-related configuration information includes a second period (for example, 32).

[0313] After sending the corresponding random access preamble code to the at least one first cell, the terminal device no longer sends the corresponding random access preamble code to the at least one first cell within the second period.

[0314] (63) The first information includes a first indication and preamble-related information (for example, including at least one random access preamble, at least one random access preamble corresponding to at least one first cell), and the random access-related configuration information includes a second time window.

[0315] The terminal device sets the timing duration of the synchronization cycle timer to the second period. When the synchronization cycle timer times out, the terminal device sends the corresponding random access preamble code to at least one first cell at least once. Thereafter, the terminal device sets the timing duration of the synchronization cycle timer to the second period, and sends the corresponding random access preamble code to at least one first cell at least once again.

[0316] In one embodiment of the present application, the identifier-related information in the first information includes: the relevant identifier of at least one first cell and / or the identifier of at least one target group, which can trigger the terminal device to obtain TA according to different granularities (for example, a single first cell or a single target group), thereby improving the flexibility of the terminal device in obtaining TA.

[0317] On the basis of the above embodiment, obtaining the TA of the at least one first cell includes: receiving at least one reply message, where the at least one reply message includes the TA of the at least one first cell.

[0318] Optionally, the reply message can be one or more of the following:

[0319] Through Random Access Response (RAR).

[0320] Medium Access Control Control Element (MAC CE).

[0321] Exemplarily, based on (51) to (55), the random access-related configuration information further includes a first RACH-related configuration of at least one cell; receiving at least one reply information includes:

[0322] The terminal device may also determine a first RACH-related configuration of at least one first cell in the random access-related configuration information; and receive at least one reply message according to the first RACH-related configuration of the at least one first cell.

[0323] Exemplarily, based on (61) to (63), the random access related configuration information further includes a second RACH related configuration; and the terminal device receives at least one reply message according to the second RACH related configuration.

[0324] The following describes the operation of the terminal device after obtaining the TA in combination with some situations of TAT related information.

[0325] Exemplarily, when the TAT-related information includes the first TAT duration (and / or the first TAT), the first TAT is started after the TA of the at least one first cell is acquired.

[0326] Exemplarily, when the TAT-related information includes at least one second TAT duration (and / or at least one second TAT), for each first cell, after the TA of the first cell is acquired, the second TAT corresponding to the first cell is started.

[0327] Exemplarily, when the TAT-related information includes at least one third TAT duration (and / or at least one third TAT), for each target group, after the TA corresponding to the target group is acquired, the third TAT corresponding to the target group is started.

[0328] In an optional embodiment of the present application, the at least one reply message further includes a fifth TAT duration (and / or a fifth TAT), or a fourth TAT duration (and / or a fourth TAT) corresponding to at least one first cell, or a sixth TAT duration (and / or a sixth TAT) corresponding to at least one target group. In this case, the first message may include TAT-related information or may not include TAT-related information.

[0329] Exemplarily, the at least one reply message further includes a fifth TAT duration (and / or a fifth TAT, the duration of the fifth TAT is the fifth TAT duration);

[0330] When the TAT-related information does not include the first TAT duration (and / or the first TAT), after acquiring the TA of at least one first cell, the terminal device starts the fifth TAT; or,

[0331] When the TAT-related information includes the first TAT duration (and / or the first TAT), after obtaining the TA of at least one first cell, the terminal device updates the first TAT duration (and / or the first TAT) to the fifth TAT duration (and / or the fifth TAT) and starts the fifth TAT.

[0332] Exemplarily, the at least one reply message further includes a fourth TAT duration (and / or a fourth TAT, where the duration of the fourth TAT is the fourth TAT duration) corresponding to the at least one first cell;

[0333] When the TAT-related information does not include at least one second TAT duration (and / or at least one second TAT), for each first cell, after obtaining the TA of the first cell, the terminal device starts the fourth TAT corresponding to the first cell; or,

[0334] When the TAT-related information includes at least one second TAT duration (and / or at least one second TAT), for each first cell, after obtaining the TA of the first cell, the second TAT duration (and / or second TAT) corresponding to the first cell is updated to the fourth TAT duration (and / or fourth TAT) corresponding to the first cell, and the fourth TAT corresponding to the first cell is started.

[0335] Exemplarily, the at least one reply message further includes a sixth TAT duration (and / or a sixth TAT, where the duration of the sixth TAT is the sixth TAT duration) corresponding to the at least one target group;

[0336] When the TAT-related information does not include at least one third TAT duration (and / or at least one third TAT), for each target group, after obtaining the TA corresponding to the target group, the terminal device starts the sixth TAT corresponding to the target group; or

[0337] When the TAT-related information includes at least one third TAT duration (and / or at least one third TAT), for each target group, after obtaining the TA corresponding to the target group, the third TAT duration (and / or third TAT) corresponding to the target group is updated to the sixth TAT duration (and / or sixth TAT) corresponding to the target group, and the sixth TAT corresponding to the target group is started.

[0338] The above describes the method for obtaining the timing advance value in the embodiment of the present application. The following describes the apparatus for performing the above method provided in the embodiment of the present application. Those skilled in the art will appreciate that the method and apparatus can be combined and referenced with each other, and the relevant apparatus provided in the embodiment of the present application can perform the steps in the above-mentioned list sorting method.

[0339] In an embodiment of the present application, the network device may send multiple first messages to the terminal device. For each first message, the terminal device initiates a random access procedure to at least one first cell based on the first message. The following describes in detail the method for obtaining the timing advance provided in an embodiment of the present application, taking two first messages as an example and in conjunction with FIG4 .

[0340] FIG4 is a third schematic diagram of a method for obtaining a timing advance according to an embodiment of the present application. As shown in FIG4 , the method for obtaining a timing advance includes:

[0341] S401. The terminal device sends device capability information to the network device.

[0342] S402: The network side device sends random access related configuration information to the terminal device.

[0343] It should be noted that the execution method of S401 to S402 is the same as the execution method of S301 to S302, and the execution process of S401 to S402 will not be repeated here.

[0344] S403: The network side device sends a first message (eg, msg-1) to the terminal device, where msg-1 includes the identifier Z1 of the target group.

[0345] S404. The terminal device initiates a random access procedure to the cell indicated by Z1 according to msg-1 to obtain the TA of the cell indicated by Z1.

[0346] In a possible embodiment, the cell indicated by Z1 includes a serving cell and / or a non-serving cell.

[0347] S405: The network side device sends the first message (eg, msg-2) to the terminal device, where msg-2 includes the identifier Z2 of the target group.

[0348] S406. The terminal device initiates a random access procedure to the cell indicated by Z2 according to msg-2 to obtain the TA of the cell indicated by Z2.

[0349] In a possible embodiment, the cells indicated by Z2 include serving cells and / or non-serving cells.

[0350] In a possible embodiment, the preamble-related information included in msg-1 and msg-2 is completely identical, different, or completely different.

[0351] When msg-1 and msg-2 include different preamble-related information, during the process of initiating the random access procedure, the random access preamble sent to the cell indicated by Z1 is the same as the random access preamble sent to the cell indicated by Z2.

[0352] Exemplarily, the preamble-related information in msg-1 includes preamble 1, preamble 2, and preamble 3; the preamble-related information in msg-2 includes preamble 1, preamble 3, and preamble 4; the cells indicated by Z1 include Cell 1, Cell 2, and Cell 3; the cells indicated by Z2 include Cell 1, Cell 2, and Cell 3; in S404, the terminal device sends preamble 1 to Cell 1, preamble 2 to Cell 2, and preamble 3 to Cell 3; in S405, the terminal device sends preamble 1 to Cell 4, preamble 3 to Cell 4, and preamble 4 to Cell 6.

[0353] In the embodiment of the present application, the same random access preamble code may be sent to different first cells, thereby saving resources of the random access preamble code.

[0354] In this embodiment, the first information includes the identifier of the target group, which can trigger the terminal device to initiate a random access process in group form, save the overhead of the first information, and reduce the delay in obtaining the TA of at least one first cell.

[0355] In an embodiment of the present application, the identifier of the target group can be the identifier of the CU. When the identifier of the target group is the identifier of the CU, the signaling overhead generated by cross-CU transmission of the signaling can be avoided, thereby reducing the delay in obtaining the TA of at least one first cell.

[0356] FIG5 is a first structural diagram of a terminal device provided in an embodiment of the present application. As shown in FIG5 , the terminal device 50 of this embodiment includes:

[0357] Receiving module 501, configured to receive first information;

[0358] The sending module 502 is configured to initiate a random access process to at least one first cell according to the first information to obtain the TA of the at least one first cell, wherein the at least one first cell includes a serving cell and / or a non-serving cell.

[0359] In an optional embodiment, the sending module 502 is specifically configured to:

[0360] A random access preamble is sent to the at least one first cell.

[0361] In an optional embodiment, the first information includes one or more of the following:

[0362] A first indication is used to trigger the terminal device to initiate the random access process;

[0363] Identification related information, used to indicate the at least one first cell;

[0364] Preamble code related information, used to indicate the random access preamble code related to the random access procedure;

[0365] Timing Advance Timer (TAT) related information is used to indicate the effective duration of the TA.

[0366] In an optional embodiment, the identification-related information includes one or more of the following:

[0367] a related identifier of the at least one first cell;

[0368] an identifier of at least one target group;

[0369] Identifies a related list.

[0370] In an optional embodiment, the related identifier is any one of the following:

[0371] Cell unique identifier ID;

[0372] Mobility LTM configuration flag triggered by the lower layer;

[0373] Physical cell identifier PCI.

[0374] In an optional embodiment, the identifier of the at least one target group is any one of the following:

[0375] an identifier of at least one cell group in which the at least one first cell is located;

[0376] an identifier of at least one centralized unit CU corresponding to the at least one first cell;

[0377] An identifier of at least one distributed unit DU corresponding to the at least one first cell.

[0378] In an optional embodiment, the preamble-related information includes one or more of the following:

[0379] at least one random access preamble;

[0380] A list of at least one random access preamble.

[0381] In an optional embodiment, the TAT-related information includes one or more of the following:

[0382] First TAT;

[0383] at least one second TAT, the at least one second TAT corresponding to the at least one first cell;

[0384] At least one third TAT, the at least one third TAT corresponding to at least one target packet.

[0385] In an optional embodiment, after sending the random access preamble code to the at least one first cell, if the TA of the at least one first cell is acquired, the first TAT is started; or,

[0386] After sending the random access preamble code to the at least one first cell, for each first cell, if the TA of the first cell is acquired, the second TAT corresponding to the first cell is started.

[0387] In an optional embodiment, the sending module 502 is specifically configured to:

[0388] Send a random access preamble code to the at least one first cell according to the random access related configuration information.

[0389] In an optional embodiment, the random access related configuration information includes one or more of the following:

[0390] frequency information of at least one cell, wherein the at least one cell includes the at least one first cell;

[0391] a first random access channel (RACH) related configuration of at least one cell, where the first RACH related configuration is used by the terminal device to receive reply information, where the reply information includes a TA;

[0392] an identifier of the group to which at least one cell belongs;

[0393] a first period of at least one cell;

[0394] A first time window of at least one cell.

[0395] In an optional embodiment, the first period of the cell is:

[0396] The duration of sending a random access preamble to the cell at least once; or

[0397] After sending a random access preamble to the cell, the duration of time during which a random access preamble is no longer sent to the cell; or

[0398] The reset duration of the synchronization period timer is used to send a random access preamble code to the cell once the synchronization period timer expires.

[0399] In an optional embodiment, the first time window of the cell is a time period occupied by sending a random access preamble to the cell, or a time period occupied by sending a random access preamble to the at least one cell.

[0400] In an optional embodiment, the random access related configuration information includes one or more of the following:

[0401] The second RACH related configuration is used for the terminal device to receive reply information, where the reply information includes a TA;

[0402] Second cycle;

[0403] Second time window.

[0404] In an optional embodiment, the second period is:

[0405] a duration occupied by sending a random access preamble code at least once to the at least one first cell; or

[0406] After sending the random access preamble to the at least one first cell, the duration of not sending the random access preamble to the at least one first cell; or,

[0407] The reset duration of the synchronization period timer is used to send a random access preamble code to the at least one first cell once when the synchronization period timer times out.

[0408] In an optional embodiment, the second time window is a period of time occupied by sending a random access preamble code to the at least one first cell after receiving the first information.

[0409] In an optional embodiment, the receiving module 501 is further configured to:

[0410] At least one reply message is received, where the at least one reply message includes the TA of the at least one first cell.

[0411] In an optional embodiment, the at least one reply message further includes a TAT corresponding to the at least one first cell.

[0412] The terminal device provided in this embodiment is used to implement the technical solution of the terminal device in the aforementioned method embodiment. Its implementation principle and technical effects are similar and will not be repeated here.

[0413] Figure 6 is a second schematic diagram of the structure of a terminal device provided in an embodiment of the present application. As shown in Figure 6, the terminal device 60 provided in this embodiment includes: a memory 601, a processor 602, and a transceiver 603. The transceiver 603 may include: a transmitter and / or a receiver. The transmitter may also be referred to as a transmitter, a transmitter, a transmitting port, a transmitting interface, or similar descriptions, and the receiver may also be referred to as a receiver, a receiving port, a receiving interface, or similar descriptions. For example, the memory 601, the processor 602, and the transceiver 603 are interconnected via a bus 604.

[0414] The memory 601 is used to store computer-executable instructions.

[0415] The processor 602 is used to execute the computer execution instructions stored in the memory, so that the terminal device executes the method steps executed by the terminal device in the aforementioned method embodiment. Its implementation principles and technical effects are similar and will not be repeated here.

[0416] FIG7 is a schematic diagram of a network side device according to an embodiment of the present application. As shown in FIG7 , the network side device 70 provided in this embodiment includes:

[0417] The sending module 701 is used to send first information to the terminal device, where the first information is used by the terminal device to initiate a random access process to at least one first cell to obtain the TA of the at least one first cell.

[0418] In an optional embodiment, the sending module 701 is further configured to:

[0419] Random access related configuration information is sent to the terminal device, where the random access related configuration information is used by the terminal device to send a random access preamble code to the at least one first cell.

[0420] The network-side device provided in this embodiment is used to implement the technical solution of the network-side device in the aforementioned method embodiment. Its implementation principle and technical effects are similar and will not be repeated here.

[0421] Figure 8 is a second schematic diagram of the structure of a network-side device provided in an embodiment of the present application. As shown in Figure 8, the network-side device 80 provided in this embodiment includes: a memory 801, a processor 802, and a transceiver 803. The transceiver 803 may include: a transmitter and / or a receiver. The transmitter may also be referred to as a transmitter, a transmitter, a transmitting port, a transmitting interface, or similar descriptions, and the receiver may also be referred to as a receiver, a receiving port, a receiving interface, or similar descriptions. For example, the memory 801, the processor 802, and the transceiver 803 are interconnected via a bus 804.

[0422] The memory 801 is used to store computer-executable instructions.

[0423] The processor 802 is used to execute the computer execution instructions stored in the memory, so that the network side device executes the method steps executed by the network side device in the aforementioned method embodiment. Its implementation principles and technical effects are similar and will not be repeated here.

[0424] An embodiment of the present application provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements a method executed by a terminal device and / or a method executed by a network-side device.

[0425] An embodiment of the present application provides a computer program product, which includes a computer program. When the computer program is executed, the computer executes a method executed by a terminal device and / or a method executed by a network-side device.

[0426] An embodiment of the present application provides a chip or chip system, comprising at least one processor and a communication interface, wherein the communication interface and the at least one processor are interconnected via a circuit, and the at least one processor is configured to execute a computer program or instruction to execute a method executed by a terminal device and / or a method executed by a network-side device. The communication interface in the chip may be an input / output interface, a pin, or a circuit.

[0427] The methods described in the above embodiments can be implemented in whole or in part through software, hardware, firmware, or any combination thereof. If implemented in software, the functions can be stored as one or more instructions or codes on a computer-readable storage medium or transmitted on a computer-readable storage medium. Computer-readable storage media can include computer storage media and communication media, and can also include any medium that can transfer a computer program from one place to another. The storage medium can be any target medium that can be accessed by a computer.

[0428] In an alternative embodiment, the computer-readable storage medium may include RAM, ROM, compact disc read-only memory (CD-ROM) or other optical disk storage, magnetic disk storage or other magnetic storage devices, or any other medium designed to carry or store the desired program code in the form of instructions or data structures and accessible by the computer. Moreover, any connection is appropriately referred to as a computer-readable storage medium. For example, if the software is transmitted from a website, server or other remote source using a coaxial cable, fiber optic cable, twisted pair, digital subscriber line (DSL) or wireless technology (such as infrared, radio and microwave), the coaxial cable, fiber optic cable, twisted pair, DSL or wireless technology such as infrared, radio and microwave are included in the definition of medium. Disk and optical disk as used herein include optical disk, laser disk, optical disk, digital versatile disk (DVD), floppy disk and Blu-ray disk, where disks generally reproduce data magnetically, while optical disks reproduce data optically using lasers. Combinations of the above should also be included within the scope of computer-readable storage media.

[0429] The present application embodiment is described with reference to the flow chart and / or block diagram of the method, device (system) and computer program product according to the embodiment of the present application.It should be understood that each flow process and / or box in the flow chart and / or block diagram and the combination of the flow process and / or box in the flow chart and / or block diagram can be realized by computer program instructions.These computer program instructions can be provided to the processing unit of general-purpose computer, special-purpose computer, embedded processing machine or other programmable device to produce a machine, so that the instruction executed by the processing unit of computer or other programmable data processing device produces the device for realizing the function specified in one flow chart flow or multiple flows and / or one block or multiple blocks of block diagram.

[0430] The above specific embodiments further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for obtaining a timing advance, applied to a terminal device, characterized in that: include: receiving a first message; According to the first information, a random access procedure is initiated to at least one first cell to obtain a timing advance TA of the at least one first cell, where the at least one first cell includes a serving cell and / or a non-serving cell.

2. The method according to claim 1, characterized in that Initiating a random access procedure to at least one first cell, including: A random access preamble is sent to the at least one first cell.

3. The method according to claim 1 or 2, characterized in that The first information includes one or more of the following: A first indication is used to trigger the terminal device to initiate the random access process; Identification related information, used to indicate the at least one first cell; Preamble code related information, used to indicate the random access preamble code related to the random access procedure; Timing Advance Timer (TAT) related information is used to indicate the effective duration of the TA.

4. The method according to claim 3, characterized in that The identification-related information includes one or more of the following: a related identifier of the at least one first cell; an identifier of at least one target group; Identifies a related list.

5. The method according to claim 4, characterized in that The relevant identifier is any of the following: Cell unique identifier ID; Mobility LTM configuration flag triggered by the lower layer; Physical cell identifier PCI.

6. The method according to claim 4, characterized in that The identifier of the at least one target group is any one of the following: an identifier of at least one cell group in which the at least one first cell is located; an identifier of at least one centralized unit CU corresponding to the at least one first cell; An identifier of at least one distributed unit DU corresponding to the at least one first cell.

7. The method according to claim 3, characterized in that The preamble-related information includes one or more of the following: at least one random access preamble; A list of at least one random access preamble.

8. The method according to claim 3, characterized in that The TAT-related information includes one or more of the following: First TAT; at least one second TAT, the at least one second TAT corresponding to the at least one first cell; At least one third TAT, the at least one third TAT corresponding to at least one target packet.

9. The method according to claim 8, characterized in that After sending a random access preamble to the at least one first cell, if a TA of the at least one first cell is acquired, starting a first TAT; or, After sending the random access preamble code to the at least one first cell, for each first cell, if the TA of the first cell is acquired, the second TAT corresponding to the first cell is started.

10. The method according to any one of claims 2 to 9, characterized in that Sending a random access preamble to at least one first cell includes: Send a random access preamble code to the at least one first cell according to the random access related configuration information.

11. The method according to claim 10, characterized in that The random access related configuration information includes one or more of the following: frequency information of at least one cell, wherein the at least one cell includes the at least one first cell; a first random access channel (RACH) related configuration of at least one cell, where the first RACH related configuration is used by the terminal device to receive reply information, where the reply information includes a TA; an identifier of the group to which at least one cell belongs; a first period of at least one cell; A first time window of at least one cell.

12. The method according to claim 11, characterized in that The first cycle of the cell is: The duration of sending a random access preamble to the cell at least once; or After sending a random access preamble to the cell, the duration of time during which a random access preamble is no longer sent to the cell; or The reset duration of the synchronization period timer is used to send a random access preamble code to the cell once the synchronization period timer expires.

13. The method according to claim 11 or 12, characterized in that The first time window of the cell is a time period occupied by sending a random access preamble to the cell, or a time period occupied by sending a random access preamble to the at least one cell.

14. The method according to claim 9, characterized in that The random access related configuration information includes one or more of the following: The second RACH related configuration is used for the terminal device to receive reply information, where the reply information includes a TA; Second cycle; Second time window.

15. The method according to claim 14, characterized in that The second cycle is: a duration occupied by sending a random access preamble code at least once to the at least one first cell; or After sending the random access preamble to the at least one first cell, the duration of not sending the random access preamble to the at least one first cell; or, The reset duration of the synchronization period timer is used to send a random access preamble code to the at least one first cell once when the synchronization period timer times out.

16. The method according to claim 14 or 15, characterized in that The second time window is a period of time occupied by sending a random access preamble code to the at least one first cell after receiving the first information.

17. The method according to any one of claims 1 to 16, characterized in that Acquiring the TA of the at least one first cell includes: At least one reply message is received, where the at least one reply message includes the TA of the at least one first cell.

18. The method according to claim 17, characterized in that The at least one reply message further includes a fourth TAT corresponding to the at least one first cell.

19. A method for obtaining a timing advance, applied to a network-side device, characterized in that: include: First information is sent to a terminal device, where the first information is used by the terminal device to initiate a random access process to at least one first cell to obtain a TA of the at least one first cell.

20. The method according to claim 19, wherein The method further comprises: Random access related configuration information is sent to the terminal device, where the random access related configuration information is used by the terminal device to send a random access preamble code to the at least one first cell.

21. A terminal device, characterized in that: include: processor and memory; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the terminal device performs the method according to any one of claims 1 to 18.

22. A network side device, characterized in that: include: processor and memory; The memory stores computer-executable instructions; The processor executes the computer-executable instructions stored in the memory, so that the network-side device executes the method according to claim 19 or 20.

23. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the method according to any one of claims 1 to 18 or the method according to claim 19 or 20 is implemented.

24. A computer program product, characterized in that The method comprises a computer program which, when being executed, causes a computer to execute the method according to any one of claims 1 to 18 or the method according to claim 19 or 20.

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