A timing advance determination method, apparatus and storage medium

Abstract

The present disclosure relates to a timing advance determination method and device, and a storage medium, and belongs to the technical field of communication, and is used for guaranteeing the validity of TA and improving the switching efficiency of a cell. The method comprises the following steps: determining a first timing advance TA, wherein the first TA is a TA between a candidate cell and a terminal, and the candidate cell is a cell which is not accessed by the terminal.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of communication, and particularly relates to a timing advance determination method and device and storage medium. BACKGROUND

[0002] The network device can inform the terminal to send the uplink signal with a proper timing advance by sending a timing advance (TA) command, so that the signals sent by different terminals are aligned within the cyclic prefix range when reaching the network device.

[0003] In a Layer 1 / Layer 2 (L1 / L2) based inter-cell mobility (LTM) scenario, there are many methods for measuring the TA of the terminal to each cell, but the TA of the terminal will change as the terminal moves. SUMMARY

[0004] To overcome the problems in the related art, the present disclosure provides a timing advance determination method and device and storage medium.

[0005] According to a first aspect of an embodiment of the present disclosure, a timing advance determination method is provided, executed by a terminal, and the method comprises: determining a first timing advance TA, the first TA being a TA between a candidate cell and the terminal, the candidate cell being a cell not accessed by the terminal.

[0006] In an embodiment, the determining the first TA comprises:

[0007] The terminal determines the first TA in response to not receiving first indication information within a first time period.

[0008] In an embodiment, the determining the first TA comprises:

[0009] The terminal determines the first TA in response to the second TA being invalid after determining that the second TA is invalid, the second TA being a TA between a candidate cell and the terminal.

[0010] In an embodiment, the second TA is invalid in response to not receiving the first indication information within a first time period.

[0011] In an embodiment, the determining the first TA comprises:

[0012] The terminal determines the first TA after receiving the first indication information within a first time period.

[0013] In an embodiment, the determining the first TA comprises:

[0014] sending second indication information, the second indication information being used for indicating that there is a second TA invalidation of a candidate cell;

[0015] sending third indication information, the third indication information being used for indicating a cell identity of the candidate cell;

[0016] receiving the first indication information, and determining the first TA.

[0017] In an implementation form, the second indication information is carried in a reserved scheduling request resource, the scheduling request resource including a resource dedicated for carrying the second indication information or a resource for beam failure recovery.

[0018] In an implementation form, the determining the first TA comprises:

[0019] determining the first TA based on a first downlink signal, the first downlink signal being sent by the candidate cell.

[0020] In an implementation form, the determining the first TA comprises:

[0021] sending a random access preamble to the candidate cell;

[0022] receiving a random access response;

[0023] determining the first TA based on the random access response.

[0024] In an implementation form, the first time length is determined based on a timer.

[0025] In an implementation form, the timer is determined to start timing in at least one of the following manners:

[0026] the timer starts timing after the terminal receives the first indication information for the first time;

[0027] the timer starts timing after the terminal sends a preamble sequence;

[0028] the timer starts timing after the terminal determines the first TA based on a preset algorithm.

[0029] In an implementation form, the timer is determined to end current timing and restart timing in at least one of the following manners:

[0030] the timer ends current timing and restarts timing after the terminal receives the first indication information;

[0031] the timer ends current timing and restarts timing after the terminal sends a preamble sequence;

[0032] After the terminal determines the first TA based on a preset algorithm, the timer ends current timing and restarts timing;

[0033] After the second indication information and / or the third indication information are sent, the timer ends current timing and restarts timing.

[0034] According to a second aspect of the embodiments of the present disclosure, a timing advance determination method is provided, which is performed by a network device, and the method comprises:

[0035] sending first indication information, the first indication information being used for instructing or triggering the terminal to determine a first timing advance TA, the first TA being a TA between a candidate cell and the terminal, the candidate cell being a cell which is not accessed by the terminal.

[0036] In an implementation manner, the method further comprises:

[0037] receiving a random access preamble;

[0038] measuring the first TA based on the random access preamble;

[0039] sending a random access response.

[0040] In an implementation manner, the sending of the first indication information comprises:

[0041] receiving second indication information and third indication information sent by the terminal, the second indication information being used for indicating that a current TA of a candidate cell is invalid, and the third indication information being used for indicating a cell identifier of the candidate cell;

[0042] sending the first indication information.

[0043] In an implementation manner, the second indication information is carried in a reserved scheduling request resource, and the scheduling request resource comprises a resource which is specially used for carrying the second indication information or a resource which is used for beam failure recovery.

[0044] According to a third aspect of the embodiments of the present disclosure, a timing advance determination apparatus is provided, and the apparatus comprises:

[0045] a processing module, configured to determine a first timing advance TA, the first TA being a TA between a candidate cell and the terminal, the candidate cell being a cell which is not accessed by the terminal.

[0046] In an implementation manner, the processing module is configured to, when no first indication information is received within a first time length, trigger the terminal to determine the first TA.

[0047] In an embodiment, the processing module is configured to determine the first TA after determining that the second TA is invalid, the second TA being a TA between the candidate cell and the terminal.

[0048] In an embodiment, the second TA is determined to be invalid in response to the first indication information not being received within a first time period.

[0049] In an embodiment, the processing module is configured to determine the first TA after the first indication information is received within the first time period.

[0050] In an embodiment, the sending module is configured to send second indication information, the second indication information being used to indicate that the second TA of the candidate cell is invalid.

[0051] The sending module is configured to send third indication information, the third indication information being used to indicate a cell identity of the candidate cell.

[0052] The receiving module is configured to receive the first indication information and determine the first TA.

[0053] In an embodiment, the second indication information is carried in a reserved scheduling request resource, the scheduling request resource including a resource dedicated to carrying the second indication information or a resource used for beam failure recovery.

[0054] In an embodiment, the processing module is configured to determine the first TA based on a first downlink signal, the first downlink signal being sent by the candidate cell.

[0055] In an embodiment, the sending module is configured to send a random access preamble to the candidate cell.

[0056] The receiving module is configured to receive a random access response.

[0057] The processing module is configured to determine the first TA based on the random access response.

[0058] In an embodiment, the first time period is determined based on a timer.

[0059] In an embodiment, the timer is determined to start counting based on at least one of the following:

[0060] The timer starts counting after the terminal receives the first indication information for the first time.

[0061] The timer starts counting after the terminal sends a preamble sequence.

[0062] The timer starts counting after the terminal determines the first TA based on a preset algorithm.

[0063] In an implementation, the timer determines to end current timing and restart timing based on at least one of the following:

[0064] After the terminal receives the first indication information, the timer ends current timing and restarts timing;

[0065] After the terminal sends a preamble sequence, the timer ends current timing and restarts timing;

[0066] After the terminal determines the first TA based on a preset algorithm, the timer ends current timing and restarts timing;

[0067] After sending the second indication information and / or the third indication information, the timer ends current timing and restarts timing.

[0068] According to a fourth aspect of the embodiments of the present disclosure, a timing advance determination apparatus is provided, and the apparatus comprises:

[0069] A sending module is configured to send first indication information, the first indication information being used to indicate or trigger the terminal to determine a first timing advance (TA), the first TA being a TA between a candidate cell and the terminal, the candidate cell being a cell not accessed by the terminal.

[0070] In an implementation, a receiving module is configured to receive a random access preamble;

[0071] A processing module is configured to measure the first TA based on the random access preamble;

[0072] A sending module is configured to send a random access response.

[0073] In an implementation, the receiving module is configured to receive second indication information and third indication information sent by the terminal, the second indication information being used to indicate that a current TA of a candidate cell is invalid, and the third indication information being used to indicate a cell identity of the candidate cell.

[0074] A sending module is configured to send the first indication information.

[0075] In an implementation, the second indication information is carried in a reserved scheduling request resource, the scheduling request resource including a resource dedicated to carrying second indication information or a resource used for beam failure recovery.

[0076] According to a fifth aspect of the embodiments of the present disclosure, a timing advance determination apparatus is provided, including: a processor; a memory for storing processor-executable instructions; and wherein the processor is configured to perform the method in the first aspect or any of the implementation forms of the first aspect.

[0077] According to a sixth aspect of the embodiments of the present disclosure, a timing advance determination apparatus is provided, including: a processor; a memory for storing processor-executable instructions; and wherein the processor is configured to perform the method in the second aspect or any of the implementation forms of the second aspect.

[0078] According to a seventh aspect of the embodiments of the present disclosure, a storage medium is provided, and the storage medium stores instructions, when the instructions in the storage medium are executed by a processor of a terminal, the terminal is enabled to perform the method in the first aspect or any of the implementation forms of the first aspect.

[0079] According to an eighth aspect of the embodiments of the present disclosure, a storage medium is provided, and the storage medium stores instructions, when the instructions in the storage medium are executed by a processor of a network device, the network device is enabled to perform the method in the second aspect or any of the implementation forms of the second aspect.

[0080] The technical solution provided by the embodiments of the present disclosure can include the following beneficial effects: the terminal can determine the first TA between the candidate cell and the terminal, ensure the validity of the first TA between the candidate cell and the terminal, and since the candidate cell is a cell not accessed by the terminal, the uplink synchronization is not required when performing the cell switching, and the switching is completed faster.

[0081] It should be understood that the foregoing general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure. BRIEF DESCRIPTION OF DRAWINGS

[0082] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments consistent with the present disclosure and serve to explain the principles of the present disclosure together with the specification.

[0083] Figure 1 is a schematic diagram of a wireless communication system according to an exemplary embodiment.

[0084] Figure 2 is a schematic diagram of a network device maintaining multiple candidate cells for a terminal according to an exemplary embodiment.

[0085] Figure 3A is a schematic diagram of a process of interaction between a terminal and a network device to determine TA according to an exemplary embodiment.

[0086] Figure 3B is a flowchart of a TA determination method according to an example embodiment.

[0087] Figure 4 is a flowchart of a TA determination method according to an example embodiment.

[0088] Figure 5 is a flowchart of a TA determination method according to an example embodiment.

[0089] Figure 6 is a flowchart of a TA determination method according to an example embodiment.

[0090] Figure 7 is a flowchart of a TA determination method according to an example embodiment.

[0091] Figure 8 is a flowchart of a TA determination method according to an example embodiment.

[0092] Figure 9 is a flowchart of a TA determination method according to an example embodiment.

[0093] Figure 10 is a flowchart of a TA determination method according to an example embodiment.

[0094] Figure 11 is a flowchart of a TA determination method according to an example embodiment.

[0095] Figure 12 is a flowchart of a TA determination method according to an example embodiment.

[0096] Figure 13 is a flowchart of a TA determination method according to an example embodiment.

[0097] Figure 14 is a block diagram of a TA determination apparatus according to an example embodiment.

[0098] Figure 15 is a block diagram of a TA determination apparatus according to an example embodiment.

[0099] Figure 16 is a block diagram of an apparatus for TA determination according to an example embodiment.

[0100] Figure 17 is a block diagram of an apparatus for TA determination according to an example embodiment. DETAILED DESCRIPTION

[0101] The exemplary embodiments will be described in detail herein with reference to the attached drawings. The following description is made with reference to the accompanying drawings in which like reference numerals refer to like elements, unless the context of use indicates otherwise. The following description of exemplary embodiments is not representative of all possible embodiments consistent with the present disclosure.

[0102] The timing advance determination method consistent with the present disclosure can be applied to a wireless communication system as shown in FIG. 1. The network system can include network devices and terminals. It can be understood that, Figure 1 the wireless communication system as shown in FIG. 1. The network system can include network devices and terminals. It can be understood that, Figure 1 The wireless communication system as shown in FIG. 1 is only illustrative. Other network devices can also be included in the wireless communication system, such as core network devices, wireless relay devices, and wireless backhaul devices, etc., which are not shown in FIG. 1. The number of network devices and terminals included in the wireless communication system is not limited in the embodiments of the present disclosure. Figure 1

[0103] It can be further understood that the wireless communication system consistent with the present disclosure is a network that provides wireless communication functions. The wireless communication system can use different communication technologies, such as Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency-Division Multiple Access (OFDMA), Single Carrier FDMA (SC-FDMA), Carrier Sense Multiple Access with Collision Avoidance. According to different network capacities, rates, time delays, and other factors, the network can be divided into 2G (English: Generation) network, 3G network, 4G network, or future evolution network, such as the 5th Generation Wireless Communication System (5G) network. The 5G network can also be referred to as a New Radio (NR) network. For convenience of description, the wireless communication network can be referred to as a network.

[0104] ​Further, the network device involved in the present disclosure can also be referred to as a wireless access network device. The wireless access network device can be a base station, an evolved Node B (eNB), a home base station, an access point (AP) in a Wireless Fidelity (WiFi) system, a wireless relay node, a wireless backhaul node, a transmission point (TP), or a transmission and receiving point (TRP), etc., and can also be a gNB in an NR system, or can also be a component or a part of a device constituting a base station, etc. When it is a vehicle-to-everything (V2X) communication system, the network device can also be a vehicle-mounted device. It should be understood that the specific technology and specific device form adopted by the network device in the embodiments of the present disclosure are not limited.

[0105] Further, the terminal involved in the present disclosure can also be referred to as a terminal device, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), etc., and is a device that provides voice and / or data connectivity for a user, for example, a handheld device with wireless connection function, a vehicle-mounted device, etc. At present, some examples of the terminal are: a mobile phone, a pocket personal computer (PPC), a palm computer, a personal digital assistant (PDA), a notebook computer, a tablet computer, a wearable device, or a vehicle-mounted device, etc. In addition, when it is a vehicle-to-everything (V2X) communication system, the terminal device can also be a vehicle-mounted device. It should be understood that the specific technology and specific device form adopted by the terminal in the embodiments of the present disclosure are not limited.

[0106] In the embodiments of the present disclosure, the network device and the terminal can adopt any feasible wireless communication technology to realize mutual transmission of data. Wherein, the transmission channel corresponding to the data or control information transmitted by the network device to the terminal is referred to as a downlink (DL) channel, and the transmission channel corresponding to the data or control information transmitted by the terminal to the network device is referred to as an uplink (UL) channel. It can be understood that the network device involved in the embodiments of the present disclosure can be a base station. Of course, the network device can also be any other possible network device, and the terminal can be any possible terminal, which is not limited by the present disclosure.

[0107] Among related technologies, L1 / L2-based Inter-Cell Mobility (LTM) has been proposed. For example... Figure 2 As shown, the terminal's current serving cell is cell 1, and the network equipment can maintain multiple candidate cells (cell 2, cell 3, and cell 4) for the terminal. As the terminal moves, when a handover is needed, it can select one of the candidate cells as the target cell. For example, if the terminal moves from cell 1 to cell 3, it can handover to cell 3. Unlike traditional cell handover methods, to reduce handover latency and complete the handover as quickly as possible, the current approach considers determining whether to perform a cell handover based on L1 measurement results, and designs the handover signaling as dynamic signaling. Furthermore, it is necessary to consider pre-measuring the timing advance (TA) from the UE to each candidate cell to complete the handover more quickly.

[0108] In some embodiments of this application, during initial access, the network device measures the TA (Transmission Acquisition Term) from the terminal to the serving cell through a random access procedure. The network device obtains the latest TA from the terminal to the serving cell based on the terminal's uplink transmissions. If the network device determines that the terminal needs to update its TA, it sends the TA to the terminal via an indication message. The network device can obtain the latest TA based on any uplink transmission from the terminal. However, in LTM (Local Time Management), the terminal has not yet established a connection with a candidate cell, and the network device cannot measure the TA of the candidate cell and indicate the latest TA to the terminal in this way.

[0109] Based on this, the present disclosure provides a TA determination method, which enables the terminal to determine the first TA between the candidate cell and the terminal, ensuring the validity of the first TA between the candidate cell and the terminal. Since the candidate cell is a cell that the terminal has not accessed, uplink synchronization is not required when performing cell handover, thus completing the handover faster.

[0110] Figure 3A This is a schematic diagram illustrating a TA determination method according to an exemplary embodiment, implemented through interaction between a terminal and a network device, including the following steps.

[0111] In step S1, the network device sends a first instruction message to the terminal.

[0112] In step S2, the terminal determines the second TA of the candidate cell.

[0113] The method for determining the second TA by the terminal can be found in [reference needed]. Figure 3A The method for determining the first TA is determined by the middle terminal.

[0114] It is worth mentioning that when the terminal determines the second TA of the candidate cell for the first time, the terminal receives the first indication information sent by the network device, sends a random access preamble to the network device based on the first indication information, the network device measures the second TA based on the random access preamble, and sends a random access response to the terminal, and the terminal determines the second TA based on the random access response. Alternatively, when the terminal determines the second TA of the candidate cell for the first time, the terminal receives the first indication information sent by the network device, and further determines the second TA based on the time difference value of the downlink reference signals sent by the serving cell and the candidate cell.

[0115] In step S3, the terminal determines that the second TA is invalid.

[0116] In an embodiment, if the terminal does not receive the first indication information sent by the serving cell of the network device within the first time length, the terminal determines that the second TA is invalid.

[0117] In step S4, the terminal determines the first TA.

[0118] In some embodiments, the specific implementation of the terminal determining the first TA of the candidate cell can include three implementation modes A, B and C as shown in Figure 3A , and the terminal selects one of the three implementation modes A, B and C to determine the first TA based on the actual situation.

[0119] In an embodiment, the specific implementation of the terminal determining the first TA of the candidate cell is as shown in Figure 3A A of .

[0120] In step S411, the terminal determines the first TA based on the time difference value of the downlink reference signals sent by the serving cell and the candidate cell.

[0121] In another embodiment, the specific implementation of the terminal determining the first TA of the candidate cell is as shown in Figure 3A B of .

[0122] In step S421, the network device sends a random access preamble to the terminal.

[0123] In step S422, the network device measures the first TA.

[0124] In step S423, the network device sends a random access response to the terminal.

[0125] In step S424, the terminal determines the first TA based on the random access response.

[0126] In another embodiment, the specific implementation of the terminal determining the first TA of the candidate cell is as shown in Figure 3AAs shown in FIG. 4, the method includes steps S431-S433.

[0127] In step S431, the terminal sends the second indication information and the third indication information to the network device.

[0128] In an implementation, the second indication information is used to indicate that the second TA of the candidate cell is invalid, and the third indication information is used to indicate the cell identity of the candidate cell.

[0129] In step S432, the network device sends the first indication information to the terminal.

[0130] In step S433, the terminal determines the first TA based on the first indication information.

[0131] In the embodiments of the present disclosure, after the terminal determines that the second TA between the candidate cell and the terminal is invalid, the terminal can actively determine the first TA between the candidate cell and the terminal, so as to ensure the validity of the TA between the terminal and the candidate cell, and the uplink synchronization is not needed when performing the cell switching, and the cell switching is completed faster.

[0132] Figure 3B FIG. 4 is a flowchart of a TA determination method according to an example embodiment, as shown in FIG. 4, the TA determination method is performed by a terminal and includes the following steps. Figure 3B

[0133] In step S11, a first TA is determined, the first TA is a TA between a candidate cell and a terminal, and the candidate cell is a cell which is not accessed by the terminal.

[0134] In the step of determining the first TA, the terminal can measure and determine the TA of the candidate cell, or the terminal initiates a random access preamble to the candidate cell, and the network device measures the first TA of the candidate cell.

[0135] In the embodiments of the present disclosure, the terminal can determine the first TA between the candidate cell and the terminal, and ensure the validity of the first TA between the candidate cell and the terminal. Since the candidate cell is a cell which is not accessed by the terminal, the uplink synchronization is not needed when performing the cell switching, and the cell switching is completed faster.

[0136] The triggering condition of triggering the terminal to determine the first TA is described below.

[0137] In the TA determination method provided in the embodiments of the present disclosure, the terminal does not receive the first indication information within a first time length, and the terminal triggers the terminal to determine the first TA. As shown in FIG. 5, a flowchart of a TA determination method is provided, including step S21. Figure 4

[0138] In step S21, the first indication information is not received within the first time length, and the terminal is triggered to determine the first TA.​​

[0139] In an implementation, the first indication information is indication information sent by a serving cell of the network device, and is used to instruct or trigger the terminal to determine the first TA.

[0140] In the embodiments of the present disclosure, if the terminal does not receive the first indication information within the first time length, the terminal triggers to determine the first TA by itself, without waiting for the first indication information sent by the network device, thereby ensuring the validity of the first TA, and without performing uplink synchronization when performing cell switching, and the switching is completed faster.

[0141] In the TA determination method provided by the embodiments of the present disclosure, after the terminal determines that the second TA between the terminal and the candidate cell is invalid, the terminal triggers the terminal to determine the first TA. Figure 5 As shown in the figure, a flowchart of a TA determination method is provided, including step S31:

[0142] In step S31, after determining that the second TA is invalid, the terminal triggers to determine the first TA.

[0143] In an implementation, the second TA is a TA between the candidate cell and the terminal.

[0144] In an implementation, the second TA can be understood as a current TA between the candidate cell and the terminal.

[0145] In the embodiments of the present disclosure, if the terminal determines that the second TA is invalid, the terminal triggers to determine the first TA by itself, without waiting for the first indication information sent by the network device, thereby ensuring the validity of the first TA, and without performing uplink synchronization when performing cell switching, and the switching is completed faster.

[0146] In the TA determination method provided by the embodiments of the present disclosure, if the terminal does not receive the first indication information within the first time length, it can be determined that the second TA is invalid.

[0147] In the TA determination method provided by the embodiments of the present disclosure, if the terminal does not receive the first indication information within the first time length, it is determined that the second TA is invalid, and the first TA is determined. As shown in the figure, a flowchart of a TA determination method is provided, including the following steps: Figure 6

[0148] In step S41, if the first indication information is not received within the first time length, it is determined that the second TA is invalid.

[0149] In step S42, the terminal is triggered to determine the first TA.

[0150] ​In the embodiment of the present disclosure, if the terminal does not receive the first indication information within the first time length, it can be determined that the second TA is invalid. In order to ensure the validity between the candidate cell and the terminal, the terminal triggers to determine the first TA by itself without waiting for the first indication information sent by the network device, and does not need to perform uplink synchronization when performing cell switching, and the switching is completed faster.

[0151] In the TA determination method provided in the embodiment of the present disclosure, if the terminal receives the first indication information within the first time length, the first TA is determined after receiving the first indication information. As shown in Figure 7 The flowchart of the TA determination method is provided, which includes the following steps:

[0152] In step S51, the first TA is determined after receiving the first indication information within the first time length.

[0153] In an embodiment, the network device can send the first indication information once every preset time, or the network device sends the first indication information based on the measurement result of the LI, or the network device sends the first indication information based on the moving speed of the terminal, or the network device sends the first indication information when confirming that the terminal is close to a certain candidate cell.

[0154] In the embodiment of the present disclosure, if the terminal receives the first indication information within the first time length, the first TA can be determined based on the first indication information, the validity of the TA between the candidate cell and the terminal is ensured, and the uplink synchronization is not needed when performing cell switching, and the switching is completed faster.

[0155] The determination process of the terminal determining the first TA is described below.

[0156] In the TA determination method provided in the embodiment of the present disclosure, the terminal sends indication information to the network device, the network device sends the first indication information to the terminal based on the indication information, and the terminal determines the first TA based on the first indication information. As shown in Figure 8 The flowchart of the TA determination method is provided, which includes the following steps:

[0157] In step S61, the second indication information is sent, and the second indication information is used to indicate the second TA invalidity of the candidate cell.

[0158] In step S62, the third indication information is sent, and the third indication information is used to indicate the cell identifier of the candidate cell.

[0159] In step S63, the first indication information is received, and the first TA is determined.

[0160] In some embodiments, the terminal determines that the first indication information is not received within the first time length or determines that the second TA is invalid, and the terminal sends the second indication information and the third indication information to the network device to trigger the network device to issue the first indication information.

[0161] In some embodiments, the terminal can send the second indication information and the third indication information at the same time, or the terminal sends the second indication information and the third indication information separately, which is not limited in the embodiments of the present disclosure.

[0162] It should be understood that the second indication information and the third indication information are both indication information sent by the terminal to the serving cell of the network device, and the fourth indication information sent by the network device also refers to the fourth indication information sent by the serving cell of the network device.

[0163] In the embodiments of the present disclosure, the terminal sends the second indication information and the third indication information to the serving cell of the network device, and the first indication information issued by the network device indicates that the terminal determines the first TA, guarantees the validity of the first TA, and does not need to perform uplink synchronization when performing cell switching, thereby completing the switching faster.

[0164] In the TA determination method provided in the embodiments of the present disclosure, the second indication information is carried in a reserved scheduling request resource, and the scheduling request resource includes a resource dedicated to carrying the second indication information or a resource for beam failure recovery.

[0165] The network device can reserve a specific scheduling request resource for the terminal, and the terminal feeds back the second indication information to the network device on the specific scheduling request resource. The specific scheduling request resource is a resource dedicated to carrying the second indication information. Alternatively, the network device does not reserve a resource dedicated to carrying the second indication information for the terminal, and the terminal can multiplex a resource for beam failure recovery and feed back the second indication information on the resource for beam failure recovery.

[0166] In an implementation manner, the second indication information can be a specific bit combination or bit sequence, etc., used to indicate that the current TA of the candidate cell is invalid.

[0167] In the TA determination method provided in the embodiments of the present disclosure, the third indication information can be carried in a specified MAC CE, for example, the third indication information is fed back through the MAC CE on the first physical uplink shared channel (PUSCH) after the second indication information is fed back; or the third indication information and the second indication information are reported together.

[0168] In the TA determination method provided in the embodiments of the present disclosure, the first indication information can be downlink control information (DCI) carrying a PDCCH order, or newly designed signaling, or multiplexed TA command of a serving cell.

[0169] In the TA determination method provided in the embodiments of the present disclosure, the terminal can determine the first TA based on a preset algorithm.

[0170] As shown in FIG. 7, Figure 9 a flowchart of a TA determination method is provided, including step S71:

[0171] In step S71, the first TA is determined based on a time difference value of downlink signal transmission of the serving cell and the candidate cell.

[0172] In an implementation, the time difference value of downlink signal transmission of the serving cell and the candidate cell can be a fixed time difference value pre-configured by the network device to the terminal.

[0173] For example, the sum or difference of the time difference value and the TA of the serving cell is the first TA of the candidate cell.

[0174] In some embodiments, the terminal determines that the first indication information sent by the network device is not received within the first time length, and determines the first TA based on the time difference value of downlink signal transmission of the serving cell and the candidate cell.

[0175] In some embodiments, the terminal determines that the second TA is invalid, and determines the first TA based on the time difference value of downlink signal transmission of the serving cell and the candidate cell.

[0176] In some embodiments, the terminal receives the first indication information sent by the network device, the first indication information indicates that the terminal determines the first TA based on the time difference value of downlink signal transmission of the serving cell and the candidate cell, and the terminal determines the first TA based on the time difference value of downlink signal transmission of the serving cell and the candidate cell.

[0177] In the embodiments of the present disclosure, the terminal can determine the first TA based on itself without the aid of the network device, thereby ensuring the validity of the first TA and completing the switching without uplink synchronization.

[0178] In the TA determination method provided in the embodiments of the present disclosure, the terminal determines the first TA based on the time difference value of downlink signal transmission of the serving cell and the candidate cell.

[0179] As shown in FIG. 7,Figure 10 As shown, a flowchart of a TA determination method is provided, including the following steps:

[0180] In step S81, a random access preamble is sent to the candidate cell.

[0181] In one embodiment, the terminal sends a random access preamble sequence to the candidate cell on a random access channel (RACH).

[0182] In step S82, a random access response is received.

[0183] In step S83, the first TA is determined based on the random access response.

[0184] In some embodiments, the terminal determines that the first indication information sent by the network device is not received within the first time period, and the terminal sends a random access preamble to the candidate cell.

[0185] In some embodiments, the terminal determines that the second TA is invalid, and the terminal sends a random access preamble to the candidate cell.

[0186] In some embodiments, the terminal receives the first indication information sent by the network device, and the first indication information indicates that the terminal sends a random access preamble to the candidate cell, and then the terminal sends a random access preamble to the candidate cell.

[0187] In the embodiments of the present disclosure, the terminal can send a random access preamble to the candidate cell, the network device measures the first TA, and the terminal determines the first TA by receiving the random access response sent by the network device, so that the uplink synchronization is not required when performing cell switching, and the switching is completed faster.

[0188] In the TA determination method provided in the embodiments of the present disclosure, the method for the terminal to determine the first TA is determined based on the capability of the terminal.

[0189] For example, when the terminal supports determining the first TA based on a preset algorithm, the terminal can determine the first TA based on the preset algorithm, or the network device can trigger the terminal to determine the first TA through the preset algorithm through the first indication information, or the network device indicates the terminal to initiate a random access preamble to the candidate cell to determine the first TA through the first indication information. When the terminal does not support determining the first TA through the preset algorithm, the terminal can determine the first TA by initiating a random access preamble to the candidate cell, or the network device indicates the terminal to initiate a random access preamble to the candidate cell to determine the first TA through the first indication information.

[0190] In the embodiments of the present disclosure, the terminal determines whether to calculate the TA of the candidate cell by itself or to trigger the network device to measure the TA of the candidate cell based on the first indication information, so as to ensure the validity of the TA of the candidate cell, and to complete the handover faster without uplink synchronization. In the embodiments of the present disclosure, the first time length is determined based on a timer.

[0191] In the embodiments of the present disclosure, the first time length is determined based on a timer.

[0192] In the embodiments of the present disclosure, the terminal receives the first indication information for the first time, and the timer starts timing in at least one of the following manners:

[0193] The terminal receives the first indication information for the first time, and the timer starts timing after the terminal sends a preamble sequence.

[0194] The terminal receives the first indication information for the first time, and the timer starts timing after the terminal determines the first TA based on a preset algorithm.

[0195] In the embodiments of the present disclosure, the terminal receives the first indication information within the first time length, and the timer ends the current timing and restarts the timing in at least one of the following manners:

[0196] The terminal receives the first indication information, and the timer ends the current timing and restarts the timing.

[0197] The terminal sends a preamble sequence, and the timer ends the current timing and restarts the timing.

[0198] The terminal determines the first TA based on a preset algorithm, and the timer ends the current timing and restarts the timing.

[0199] In the embodiments of the present disclosure, the terminal does not receive the first indication information within the first time length, and the timer ends the current timing and restarts the timing in at least one of the following manners:

[0200] The terminal receives the first indication information, and the timer ends the current timing and restarts the timing.

[0201] The terminal sends a preamble sequence, and the timer ends the current timing and restarts the timing.

[0202] The terminal determines the first TA based on a preset algorithm, and the timer ends the current timing and restarts the timing.

[0203] In the embodiments of the present disclosure, the terminal does not receive the first indication information within the first time length, and the timer ends the current timing and restarts the timing in at least one of the following manners:

[0204] After sending the second and / or third instruction information, the timer ends the current timing and restarts the timing.

[0205] It is worth noting that the start or restart of the timer in the above three scenarios is not limited to the embodiments mentioned above, but may include any other reasonable embodiments, which are not limited herein. Furthermore, the timer setting time is not fixed and can be adjusted based on actual circumstances.

[0206] Based on the same concept, this disclosure also provides a TA determination method, which is executed by a network device.

[0207] Figure 11 This is a flowchart illustrating a TA determination method according to an exemplary embodiment, such as... Figure 11 As shown, the TA determination method is performed by the network device and includes the following steps.

[0208] In step S91, a first indication message is sent. The first indication message is used to instruct or trigger the terminal to determine a first TA. The first TA is the TA between the candidate cell and the terminal. The candidate cell is a cell that the terminal has not accessed.

[0209] In this process, the network device sends the first instruction information to the terminal through the serving cell.

[0210] In this embodiment of the disclosure, the network device sends a first indication information to the terminal to instruct or trigger the terminal to determine the first TA of the candidate cell, thereby improving the effectiveness of the TA of the candidate cell.

[0211] In some embodiments, the network device may send the first indication information once every preset time interval, or the network device may send the first indication information based on the measurement results of LI, or the network device may send the first indication information based on the moving speed of the terminal, or the network device may send the first indication information when it confirms that the terminal is close to a candidate cell.

[0212] In a TA determination method provided in this embodiment, a first TA is measured upon receiving a random access preamble sent by a terminal.

[0213] like Figure 12 As shown, Figure 12 This is a flowchart illustrating a TA determination method according to an exemplary embodiment, including the following steps.

[0214] In step S1001, a random access preamble is received.

[0215] In step S1002, the first TA is measured based on the random access preamble.

[0216] In step S1003, a random access response is sent.

[0217] The specific implementation process of steps S1001 to S1003 can refer to the specific implementation process of steps S81 to S83 described above, and the embodiments of the present disclosure will not be described here.

[0218] In the embodiments of the present disclosure, the terminal can send a random access preamble to the candidate cell, the network device measures the first TA, and the terminal determines the first TA by receiving the random access response sent by the network device, so that the uplink synchronization is not needed when performing the cell switching, and the switching is completed faster.

[0219] Figure 13 is a flowchart of a TA determination method according to an exemplary embodiment, as shown in Figure 13 includes the following steps.

[0220] In step S1101, the second indication information and the third indication information sent by the terminal are received, the second indication information is used to indicate that the current TA of the candidate cell is invalid, and the third indication information is used to indicate the cell identifier of the candidate cell.

[0221] In step S1102, the first indication information is sent.

[0222] The specific implementation process of steps S1101 to S1102 can refer to the specific implementation process of steps S61 to S63 described above, and the embodiments of the present disclosure will not be described here.

[0223] In the embodiments of the present disclosure, the terminal sends the second indication information and the third indication information to the serving cell of the network device, the network device issues the first indication information to instruct the terminal to determine the first TA, ensures the validity of the first TA, and does not need to perform the uplink synchronization when performing the cell switching, so that the switching is completed faster.

[0224] In the TA determination method provided by the embodiments of the present disclosure, the second indication information is carried in a reserved scheduling request resource, and the scheduling request resource includes a resource dedicated to carrying the second indication information or a resource for beam failure recovery.

[0225] The network device can reserve a specific scheduling request resource for the terminal, and the terminal feeds back the second indication information to the network device on the specific scheduling request resource, and the specific scheduling request resource is a resource dedicated to carrying the second indication information. Alternatively, the network device does not reserve a resource dedicated to carrying the second indication information for the terminal, and the terminal can multiplex a resource for beam failure recovery, and feeds back the second indication information on the resource for beam failure recovery.

[0226] In an implementation, the second indication information can be a specific bit combination or bit sequence, etc., used to indicate that the current TA of the candidate cell is invalid.

[0227] In the TA determination method provided in the embodiments of the present disclosure, the third indication information can be carried in a specified MAC CE, for example, the third indication information is fed back through a MAC CE on the first PUSCH after the second indication information is fed back; or the third indication information is reported together with the second indication information.

[0228] In the TA determination method provided in the embodiments of the present disclosure, the first indication information can be downlink control information (DCI) carrying a PDCCH order; or a newly designed signaling, or multiplexing a TA command of a serving cell.

[0229] It should be noted that those skilled in the art can understand that the various embodiments / embodiments related in the above description of the embodiments of the present disclosure can be used in combination with the foregoing embodiments, or can be used independently. Whether it is used independently or in combination with the foregoing embodiments, the implementation principle is similar. In the embodiments of the present disclosure, some embodiments are described as embodiments used together. Of course, those skilled in the art can understand that such example descriptions are not a limitation of the embodiments of the present disclosure.

[0230] Based on the same concept, the embodiments of the present disclosure also provide a TA determination apparatus.

[0231] It can be understood that the TA determination apparatus provided by the embodiments of the present disclosure comprises a hardware structure and / or software module corresponding to the execution of each function in order to realize the above functions. In combination with the units and algorithm steps of each example disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be realized in the form of hardware or a combination of hardware and computer software. Whether a certain function is executed by hardware or computer software driven hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the technical solutions of the embodiments of the present disclosure.

[0232] Figure 14 is a TA determination apparatus block diagram according to an exemplary embodiment. Referring to Figure 14 The apparatus comprises a processing module 101.

[0233] The processing module 101 is configured to determine a first timing advance (TA), the first TA being a TA between a candidate cell and a terminal, and the candidate cell being a cell not accessed by the terminal.

[0234] In an implementation, the processing module 101 is configured to determine the first TA based on the first indication information not being received within a first time period.

[0235] In an implementation, the processing module 101 is configured to determine the first TA based on the second TA being invalid after being determined to be invalid.

[0236] In an implementation, the second TA is determined to be invalid in response to the first indication information not being received within a first time period.

[0237] In an implementation, the processing module 101 is configured to determine the first TA based on the first indication information being received within a first time period.

[0238] In an implementation, the apparatus further includes a sending module 102 and a receiving module 103. The sending module 102 is configured to send second indication information, the second indication information being used to indicate that the second TA of the candidate cell is invalid.

[0239] The sending module 102 is configured to send third indication information, the third indication information being used to indicate the cell identity of the candidate cell.

[0240] The receiving module 103 is configured to receive the first indication information and determine the first TA.

[0241] In an implementation, the second indication information is carried in a reserved scheduling request resource, the scheduling request resource including a resource dedicated to carrying the second indication information or a resource used for beam failure recovery.

[0242] In an implementation, the processing module 101 is configured to determine the first TA based on a first downlink signal, the first downlink signal being sent by the candidate cell.

[0243] In an implementation, the sending module 102 is configured to send a random access preamble to the candidate cell.

[0244] The receiving module 103 is configured to receive a random access response.

[0245] The processing module 101 is configured to determine the first TA based on the random access response.

[0246] In an implementation, the first time period is determined based on a timer.

[0247] In an implementation, the timer is determined to start timing based on at least one of the following:

[0248] The timer starts timing after the terminal first receives the first indication information.

[0249] The timer starts timing after the terminal sends a preamble sequence.

[0250] The timer starts timing after the terminal determines the first TA based on the preset algorithm.

[0251] In an embodiment, the timer determines to end the current timing and restart the timing based on at least one of the following:

[0252] The timer ends the current timing and restarts the timing after the terminal receives the first indication information;

[0253] The timer ends the current timing and restarts the timing after the terminal sends the preamble sequence;

[0254] The timer ends the current timing and restarts the timing after the terminal determines the first TA based on the preset algorithm;

[0255] The timer ends the current timing and restarts the timing after the second indication information and / or the third indication information is sent.

[0256] Figure 15 is a block diagram of a TA determination apparatus according to an exemplary embodiment. Referring to Figure 15 The apparatus includes a sending module 201.

[0257] The sending module 201 is configured to send first indication information, the first indication information being used to instruct or trigger the terminal to determine a first timing advance TA, the first TA being a TA between a candidate cell and the terminal, the candidate cell being a cell not accessed by the terminal.

[0258] In an embodiment, the apparatus includes a receiving module 202 and a processing module 203.

[0259] The receiving module 202 is configured to receive a random access preamble.

[0260] The processing module 203 is configured to measure the first TA based on the random access preamble.

[0261] The sending module 201 is configured to send a random access response.

[0262] In an embodiment, the receiving module 202 is configured to receive second indication information and third indication information sent by the terminal, the second indication information being used to indicate that a current TA of the candidate cell is invalid, and the third indication information being used to indicate a cell identity of the candidate cell.

[0263] The sending module 201 is configured to send the first indication information.

[0264] In an embodiment, the second indication information is carried in a reserved scheduling request resource, the scheduling request resource including a resource dedicated to carrying the second indication information or a resource for beam failure recovery.

[0265] With regard to the apparatus in the above-described embodiments, a specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and thus will not be described in detail here.

[0266] Figure 16 is a block diagram of an apparatus 300 for TA determination according to an exemplary embodiment. The apparatus 300 can be provided as a terminal. For example, the apparatus 300 can be a mobile phone, a computer, a digital broadcast terminal, a message transmitting / receiving device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0267] Referring to Figure 16 , the apparatus 300 can include one or more of the following components: a processing component 302, a memory 304, a power component 306, a multimedia component 308, an audio component 310, an input / output (I / O) interface 312, a sensor component 314, and a communication component 316.

[0268] The processing component 302 generally controls the overall operations of the apparatus 300, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 302 can include one or more processors 320 to execute instructions to complete all or a part of steps of the above-described methods. In addition, the processing component 302 can include one or more modules to facilitate interaction between the processing component 302 and other components. For example, the processing component 302 can include a multimedia module to facilitate the interaction between the multimedia component 308 and the processing component 302.

[0269] The memory 304 is configured to store various types of data to support the operations of the apparatus 300. Examples of these data include instructions to operate any applications or methods on the apparatus 300, contact data, phonebook data, messages, pictures, videos, etc. The memory 304 can be implemented by any type of volatile or nonvolatile storage devices or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk, or optical disk.

[0270] The power component 306 provides power to the various components of the apparatus 300. The power component 306 can include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power for the apparatus 300.

[0271] The multimedia component 308 includes a screen providing an output interface between the device 300 and a user. In some embodiments, the screen can include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen can be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors for sensing touch, swiping or gesture on the touch panel. The touch sensor can not only sense a boundary of a touching or swiping action, but also detect duration and pressure related to the touching or swiping action. In some embodiments, the multimedia component 308 includes a front camera and / or a rear camera. When the device 300 is in an operation mode, such as a shooting mode or a video mode, the front camera and / or the rear camera can receive external multimedia data. Each of the front and rear camera can be a fixed optical lens system or have a focal length and optical zooming capability.

[0272] The audio component 310 is configured to output and / or input audio signals. For example, the audio component 310 includes a microphone (MIC) that receives an external audio signal when the device 300 is in an operation mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signal can be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, the audio component 310 further includes a speaker for outputting audio signals.

[0273] The I / O interface 312 provides an interface between the processing component 302 and peripheral interface modules, such as a keypad, a click wheel, buttons, and so on. The buttons can include, but are not limited to, a home button, a volume button, a start button, and a lock button.

[0274] The sensor component 314 includes one or more sensors for providing status assessments of various aspects of the device 300. For example, the sensor component 314 can detect an open / closed position of the device 300, relative positioning of components, such as a display and a keypad of the device 300, a change of position of the device 300 or a component of the device 300, presence or absence of user contact with the device 300, a change in orientation of the device 300 or acceleration / deceleration of the device 300, and temperature changes of the device 300, among other possibilities. The sensor component 314 can include proximity sensor(s) configured to detect presence of an object in proximity to the device 300, light sensor(s), such as CMOS or CCD image sensors, for use in imaging applications, and / or other sensors / position changes. In some embodiments, the sensor component 314 can include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor, among other possibilities.

[0275] The communication component 316 is configured to facilitate wired or wireless communication between the device 300 and other devices. The device 300 can access a wireless network based on a communication standard, such as WiFi, 2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 316 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 316 further includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0276] In an exemplary embodiment, the device 300 can be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable gate arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components, for performing the above-described methods.

[0277] In an exemplary embodiment, a non-transitory computer readable storage medium including instructions, such as the memory 304 including instructions, is also provided, which can be executed by the processor 320 of the device 300 to complete the above-described methods. For example, the non-transitory computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, etc.

[0278] Figure 17 FIG. 4 is a block diagram of an apparatus 400 for TA determination according to an exemplary embodiment. For example, the apparatus 400 can be provided as a network device. Referring to Figure 17 The apparatus 400 includes a processing component 422, which further includes one or more processors, and a memory resource represented by the memory 432 for storing instructions, such as an application program, executable by the processing component 422. The application program stored in the memory 432 can include one or more than one module each corresponding to a set of instructions. In addition, the processing component 422 is configured to execute the instructions to perform the above-described methods.

[0279] The apparatus 400 can also include a power supply component 426 configured to supply power to the apparatus 400, a wired or wireless network interface 450 configured to connect the apparatus 400 to a network, and an input / output (I / O) interface 458. The apparatus 400 can operate based on an operating system stored in the memory 432, such as Windows Server™, Mac OS X™, Unix™, Linux™, FreeBSD™, or the like.

[0280] In an example embodiment, a non-transitory computer readable storage medium including instructions, such as the memory 432 including instructions, is also provided, which can be executed by the processing component 422 of the apparatus 400 to complete the above method. For example, the non-transitory computer readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disc, and an optical data storage device, etc.

[0281] It should also be understood that, in the present disclosure, "multiple" refers to two or more, and other quantifiers are similar thereto. The association relationship of "and / or" describing the associated objects means that there can be three relationships, for example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents that the associated objects before and after it are in an "or" relationship. The singular forms "a", "said" and "the" are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0282] It should be further understood that the meanings of the words "in response to", "if" and the like in the present disclosure depend on the context and the actual use scenario, such as the word "in response to" used herein can be interpreted as "when" or "when" or "if".

[0283] It should be further understood that the terms "first", "second", and the like are used to describe various information, but these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other, and do not represent a specific order or importance. In fact, the expressions "first", "second", and the like can be used interchangeably. For example, the first information can also be referred to as the second information, and similarly, the second information can also be referred to as the first information without departing from the scope of the present disclosure.

[0284] It should be further understood that although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, it should not be understood as requiring the specific order or serial order shown, or requiring all the operations shown to obtain the desired results. In a specific environment, multi-tasking and parallel processing can be advantageous.

[0285] Other embodiments of the present disclosure will be apparent to those skilled in the art upon consideration of the specification and practice of the applications disclosed herein. The present application is intended to cover any variations, uses, or adaptations of the present disclosure following the general principles thereof and including modifications and equivalents of the present disclosure that are obvious to those skilled in the art.

[0286] It should be understood that the present disclosure is not limited to the precise construction that has been described above and shown in the accompanying drawings, and that various modifications and changes can be made by those skilled in the art without departing from the scope of the present disclosure. The scope of the present disclosure is limited only by the appended claims.

Claims

1. A timing advance determination method, characterized by, The method is performed by a terminal, and the method comprises: determining second TA failure, sending second indication information and third indication information to a network device, the second indication information being used for indicating that there is second TA failure of a candidate cell, and the third indication information being used for indicating a cell identity of the candidate cell; if first indication information is received within a first time length, determining a first timing advance TA based on the first indication information, the first TA being a TA between a candidate cell and the terminal, the candidate cell being a cell which is not accessed by the terminal; if the first indication information is not received within the first time length, triggering the terminal to determine the first TA.

2. The method of claim 1, wherein, The second TA failure is in response to that the first indication information is not received within the first time length.

3. The method of claim 1, wherein, The second indication information is carried in a reserved scheduling request resource, and the scheduling request resource comprises a resource which is specially used for carrying the second indication information or a resource which is used for beam failure recovery.

4. The method according to any one of claims 1 to 3, characterized in that, The determination of the first TA comprises: determining the first TA based on a time difference value at which a serving cell and the candidate cell send downlink reference signals.

5. The method according to any one of claims 1 to 3, characterized in that, The determination of the first TA comprises: sending a random access preamble to the candidate cell; receiving a random access response; determining the first TA based on the random access response.

6. The method of claim 1, wherein, The first time length is determined based on a timer.

7. The method of claim 6, wherein, The timer is determined to start timing in at least one of the following manners: the timer starts timing after the terminal receives the first indication information for the first time; the timer starts timing after the terminal sends a preamble sequence; the timer starts timing after the terminal determines the first TA based on a preset algorithm.

8. The method according to claim 6 or 7, characterized in that, The timer is determined to end current timing and restart timing in at least one of the following manners: the timer ends current timing and restarts timing after the terminal receives the first indication information; the timer ends current timing and restarts timing after the terminal sends the preamble sequence; the timer ends current timing and restarts timing after the terminal determines the first TA based on the preset algorithm; the timer ends current timing and restarts timing after the second indication information and / or the third indication information is sent.

9. A timing advance determination method, characterized by, The method is performed by a network device, and the method comprises: receiving second indication information and third indication information which are sent by a terminal in a case of determining second TA failure, the second indication information being used for indicating that there is second TA failure of a candidate cell, and the third indication information being used for indicating a cell identity of the candidate cell; sending first indication information, the first indication information being used for indicating or triggering the terminal to determine a first timing advance TA, the first TA being a TA between the candidate cell and the terminal, the candidate cell being a cell which is not accessed by the terminal.

10. The method of claim 9, wherein, The method further comprises: receiving a random access preamble; measuring the first TA based on the random access preamble; sending a random access response.

11. The method of claim 9, wherein, The second indication information is carried in a reserved scheduling request resource, and the scheduling request resource comprises a resource which is specially used for carrying the second indication information or a resource which is used for beam failure recovery.

12. A timing advance determination apparatus, characterized by The apparatus comprises: The processing module is configured to determine second TA failure, send second indication information and third indication information to the network device, the second indication information is used to indicate that there is second TA failure of a candidate cell, and the third indication information is used to indicate a cell identifier of the candidate cell; if the first indication information is received within a first time length, a first timing advance TA is determined based on the first indication information, and the first TA is a TA between the candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal; if the first indication information is not received within the first time length, the terminal is triggered to determine the first TA.

13. A timing advance determination apparatus, characterized by The apparatus comprises: The receiving module is configured to receive second indication information and third indication information sent by the terminal in a case of determining second TA failure, the second indication information is used to indicate that there is second TA failure of a candidate cell, and the third indication information is used to indicate a cell identifier of the candidate cell; The sending module is configured to send first indication information, the first indication information is used to indicate or trigger the terminal to determine a first timing advance TA, the first TA is a TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

14. A timing advance determination apparatus characterized by comprising: Comprise: A processor; A memory for storing processor-executable instructions; The processor is configured to execute the timing advance determination method in any one of claims 1 to 8.

15. A timing advance determination apparatus, characterized by Comprise: A processor; A memory for storing processor-executable instructions; The processor is configured to execute the timing advance determination method in any one of claims 9 to 11.

16. A storage medium, characterized by The storage medium has instructions stored therein, when the instructions in the storage medium are executed by the processor of the terminal, the terminal can execute the timing advance determination method in any one of claims 1 to 8.

17. A storage medium, characterized by The storage medium has instructions stored therein, when the instructions in the storage medium are executed by the processor of the network device, the network device can execute the timing advance determination method in any one of claims 9 to 11.

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