CN116615935A

CN116615935A - Timing advance determining method, device and storage medium

Info

Publication number: CN116615935A
Application number: CN202380008637.2A
Authority: CN
Inventors: 罗星熠
Original assignee: Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2023-03-17
Filing date: 2023-03-17
Publication date: 2023-08-18

Abstract

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

Description

Timing advance determining method, device and storage medium

Technical Field

The disclosure relates to the field of communication technologies, and in particular, to a timing advance determining method, a timing advance determining device and a storage medium.

Background

The network device may notify the terminal to send an uplink signal with a proper Timing Advance by sending a Timing Advance (TA) command, so that signals sent by different terminals are aligned in a cyclic prefix range when reaching the network device.

In a Layer1 or Layer2 (Layer 1/Layer2, L1/L2) based Inter-Cell Mobility (LTM) scenario, there are many methods for measuring the TA of a terminal to each Cell, but as the terminal moves, the TA of the terminal also changes.

Disclosure of Invention

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

According to a first aspect of embodiments of the present disclosure, there is provided a timing advance determining method, performed by a terminal, the method including: and determining a first timing advance TA, wherein the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

In one embodiment, the determining the first TA includes:

and the terminal is triggered to determine the first TA after the first indication information is not received in the first duration.

In one embodiment, the determining the first TA includes:

and triggering the terminal to determine the first TA after the second TA is determined to be invalid, wherein the second TA is the TA between the candidate cell and the terminal.

In one embodiment, the second TA is disabled in response to not receiving the first indication information within the first time period.

In one embodiment, the determining the first TA includes:

and after the first indication information is received in the first time period, determining the first TA.

In one embodiment, the determining the first TA includes:

Transmitting second indication information, wherein the second indication information is used for indicating that a second TA of a candidate cell exists;

transmitting third indication information, wherein the third indication information is used for indicating the cell identification of the candidate cell;

and receiving the first indication information and determining the first TA.

In one embodiment, the second indication information is carried in reserved scheduling request resources, and the scheduling request resources comprise resources dedicated to carrying the second indication information or resources for beam failure recovery.

In one embodiment, the determining the first TA includes:

the first TA is determined based on a first downlink signal transmitted for the candidate cell.

In one embodiment, the determining the first TA includes:

transmitting a random access preamble to the candidate cell;

receiving a random access response;

the first TA is determined based on the random access response.

In one embodiment, the first time period is determined based on a timer.

In one embodiment, the timer determines to start timing based on at least one of:

after the terminal receives the first indication information for the first time, the timer starts to count;

After the terminal sends the preamble sequence, the timer starts to count;

and after the terminal determines the first TA based on a preset algorithm, the timer starts to count.

In one embodiment, the timer determines to end the current timing and to restart the timing based on at least one of:

after the terminal receives the first indication information, the timer finishes the current timing and restarts the timing;

after the terminal sends the preamble sequence, the timer ends the current timing and restarts the timing;

after the terminal determines the first TA based on a preset algorithm, the timer ends the current timing and restarts the timing;

after the second indication information and/or the third indication information are sent, the timer ends the current timing and resumes the timing.

According to a second aspect of embodiments of the present disclosure, there is provided a timing advance determination method performed by a network device, the method comprising:

and sending first indication information, wherein the first indication information is used for indicating or triggering the terminal to determine a first Timing Advance (TA), the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

In one embodiment, the method further comprises:

receiving a random access preamble;

measuring the first TA based on the random access preamble;

and sending a random access response.

In one embodiment, the sending the first indication information includes:

receiving second indication information and third indication information sent by the terminal, wherein the second indication information is used for indicating that the current TA of a candidate cell is invalid, and the third indication information is used for indicating the cell identification of the candidate cell;

and sending the first indication information.

According to a third aspect of embodiments of the present disclosure, there is provided a timing advance determination apparatus, the apparatus comprising:

and the processing module is used for determining a first timing advance TA, wherein the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

In an implementation manner, the processing module is configured to trigger the terminal to determine the first TA when the first indication information is not received in the first period.

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

In one embodiment, the processing module is configured to determine the first TA after receiving the first indication information in a first time period.

In one embodiment, the sending module is configured to send second indication information, where the second indication information is used to indicate that there is a second TA failure of the candidate cell;

the sending module is used for sending third indication information, wherein the third indication information is used for indicating the cell identification of the candidate cell;

and the receiving module is used for receiving the first indication information and determining the first TA.

In one embodiment, the processing module is configured to determine the first TA based on a first downlink signal, where the first downlink signal is sent by the candidate cell.

In one embodiment, a sending module is configured to send a random access preamble to the candidate cell;

a receiving module, configured to receive a random access response;

a processing module is configured to determine the first TA based on the random access response.

In one embodiment, the first time period is determined based on a timer.

after the terminal sends the preamble sequence, the timer starts to count;

According to a fourth aspect of embodiments of the present disclosure, there is provided a timing advance determination apparatus, the apparatus comprising:

the terminal comprises a sending module, a receiving module and a sending module, wherein the sending module is used for sending first indication information, the first indication information is used for indicating or triggering the terminal to determine a first Timing Advance (TA), the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

In one embodiment, a receiving module is configured to receive a random access preamble;

a processing module configured to measure the first TA based on the random access preamble;

and the sending module is used for sending the random access response.

In an implementation manner, the receiving module is configured to receive second indication information and third indication information sent by the terminal, where the second indication information is used to indicate that there is a current TA failure of a candidate cell, and the third indication information is used to indicate a cell identifier of the candidate cell;

and the sending module is used for sending the first indication information.

According to a fifth aspect of embodiments of the present disclosure, there is provided a timing advance determining apparatus, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to: the method of the first aspect or any implementation of the first aspect is performed.

According to a sixth aspect of the embodiments of the present disclosure, there is provided a timing advance determining apparatus, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to: the method of the second aspect or any of the embodiments of the second aspect described above is performed.

According to a seventh aspect of embodiments of the present disclosure, there is provided a storage medium having instructions stored therein, which when executed by a processor of a terminal, enable the terminal to perform the method of the first aspect or any one of the embodiments of the first aspect.

According to an eighth aspect of embodiments of the present disclosure, there is provided a storage medium having instructions stored therein, which when executed by a processor of a network device, enable the network device to perform the method described in the second aspect or any one of the embodiments of the second aspect.

The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects: the terminal can determine the first TA between the candidate cell and the terminal, and ensure the effectiveness of the first TA between the candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal, so that uplink synchronization is not needed when the switching of the cells is executed, and the switching is completed more quickly.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.

Drawings

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

Fig. 1 is a schematic diagram of a wireless communication system, according to an example embodiment.

Fig. 2 is a schematic diagram illustrating a network device maintaining a plurality of candidate cells for a terminal according to an example embodiment.

Fig. 3A is a schematic diagram illustrating a process of determining a TA interactively between a terminal and a network device according to an exemplary embodiment.

Fig. 3B is a flow chart illustrating a method of TA determination according to an example embodiment.

Fig. 4 is a flow chart illustrating a TA determination method according to an example embodiment.

Fig. 5 is a flow chart illustrating a TA determination method according to an example embodiment.

Fig. 6 is a flow chart illustrating a TA determination method according to an example embodiment.

Fig. 7 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 8 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 9 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 10 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 11 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 12 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 13 is a flowchart illustrating a TA determination method according to an example embodiment.

Fig. 14 is a block diagram illustrating a TA determining device according to an example embodiment.

Fig. 15 is a block diagram illustrating a TA determining device according to an example embodiment.

Fig. 16 is a block diagram illustrating an apparatus for TA determination according to an example embodiment.

Fig. 17 is a block diagram illustrating an apparatus for TA determination according to an example embodiment.

Detailed Description

Reference will now be made in detail to exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, the same numbers in different drawings refer to the same or similar elements, unless otherwise indicated. The implementations described in the following exemplary examples are not representative of all implementations consistent with the present disclosure.

The timing advance determination method according to the present disclosure may be applied to the wireless communication system shown in fig. 1. The network system may include a network device and a terminal. It will be appreciated that the wireless communication system shown in fig. 1 is only schematically illustrated, and that other network devices may be included in the wireless communication system, for example, a core network device, a wireless relay device, a wireless backhaul device, etc., which are not shown in fig. 1. The embodiments of the present disclosure do not limit the number of network devices and the number of terminals included in the wireless communication system.

It is further understood that the wireless communication system of the embodiments of the present disclosure is a network that provides wireless communication functionality. The wireless communication system may employ different communication techniques such as code division multiple access (Code Division Multiple Access, CDMA), wideband code division multiple access (Wideband Code Division Multiple Access, WCDMA), time division multiple access (Time Division Multiple Access, TDMA), frequency division multiple access (Frequency Division Multiple Access, FDMA), orthogonal frequency division multiple access (Orthogonal Frequency-Division Multiple Access, OFDMA), single Carrier frequency division multiple access (SC-FDMA), carrier sense multiple access/collision avoidance (Carrier Sense Multiple Access with Collision Avoidance). Networks may be classified into 2G (english: generation) networks, 3G networks, 4G networks, or future evolution networks, such as a fifth Generation wireless communication system (The 5th Generation Wireless Communication System,5G) network, and 5G networks may also be referred to as New Radio (NR) networks, according to factors such as capacity, rate, delay, etc. of different networks. For convenience of description, the present disclosure will sometimes refer to a wireless communication network simply as a network.

Further, the network devices referred to in this disclosure may also be referred to as radio access network devices. The radio access network device may be: a base station, an evolved Node B (eNB), a home base station, an Access Point (AP) in a wireless fidelity (Wireless Fidelity, WIFI) system, a wireless relay Node, a wireless backhaul Node, a transmission Point (Transmission Point, TP), or a transmission receiving Point (transmission and receiving Point, TRP), etc., or may be a gNB in an NR system, or may also be a component or a part of a device that forms a base station, etc. In the case of a vehicle networking (V2X) communication system, the network device may also be an in-vehicle device. It should be understood that in the embodiments of the present disclosure, the specific technology and specific device configuration adopted by the network device are not limited.

Further, a Terminal referred to in the present disclosure may also be referred to as a Terminal device, a User Equipment (UE), a Mobile Station (MS), a Mobile Terminal (MT), or the like, and may be a device that provides voice and/or data connectivity to a User, for example, a handheld device, an in-vehicle device, or the like that has a wireless connection function. Currently, some examples of terminals are: a smart Phone (Mobile Phone), a pocket computer (Pocket Personal Computer, PPC), a palm top computer, a personal digital assistant (Personal Digital Assistant, PDA), a notebook computer, a tablet computer, a wearable device, or a vehicle-mounted device, etc. In addition, in the case of a vehicle networking (V2X) communication system, the terminal device may also be an in-vehicle device. It should be understood that the embodiments of the present disclosure are not limited to the specific technology and specific device configuration adopted by the terminal.

In the embodiment of the disclosure, any feasible wireless communication technology can be adopted by the network device and the terminal to realize mutual data transmission. The transmission channel corresponding to the network device sending data or control information to the terminal is called a Downlink (DL), and the transmission channel corresponding to the terminal sending data or control information to the network device is called an Uplink (UL). It is to be appreciated that the network devices involved in embodiments of the present disclosure may be base stations. Of course, the network device may be any other possible network device, and the terminal may be any possible terminal, which is not limited by the present disclosure.

In the related art, inter-Cell Mobility (LTM) based on Layer1 or Layer2 (Layer 1/Layer2, L1/L2) is proposed. As shown in fig. 2, the current serving cell of the terminal is cell 1, and the network device may maintain multiple candidate cells (cell 2, cell 3, and cell 4) for the terminal. With the movement of the terminal, one cell may be selected from a plurality of candidate cells as a target cell when handover is required, for example, the terminal moves from cell 1 to cell 3, and the terminal may be handed over to cell 3. Different from the traditional cell switching mode, in order to reduce switching delay and finish switching as soon as possible, it is currently considered whether to perform cell switching or not based on the measurement result of L1, and meanwhile, switching signaling is designed as dynamic signaling. Meanwhile, timing Advance (TA) of the UE to each candidate cell needs to be measured in Advance, so that handover can be completed more quickly when the cell handover is performed.

In some embodiments of the present application, during initial access, the network device measures the TA from the terminal to the serving cell through a random access procedure, and the network device obtains the latest TA from the terminal to the serving cell according to uplink transmission of the terminal. If the network equipment confirms that the terminal needs to update the TA, the TA is sent to the terminal through the indication information. The network device may obtain the latest TA according to any uplink transmission of the terminal, but in the LTM, the terminal has not yet established a connection with the candidate cell, and the network device cannot measure the TA of the candidate cell and indicate the latest TA to the terminal according to this method.

Based on this, the embodiments of the present disclosure provide a TA determining method, where a terminal can determine a first TA between a candidate cell and a terminal, and ensure validity of the first TA between the candidate cell and the terminal, and because the candidate cell is a cell that is not accessed by the terminal, uplink synchronization is not required when handover of the cell is performed, and handover is completed more quickly.

Fig. 3A is a process diagram of a TA determination method, according to an exemplary embodiment, implemented by a terminal and a network device in interaction, including the following steps.

In step S1, the network device sends first indication information to the terminal.

In step S2, the terminal determines a second TA of the candidate cell.

The determining manner of the terminal determining the second TA may refer to the determining manner of the terminal determining the first TA in fig. 3A.

It should be noted that, when the terminal determines the second TA of the candidate cell for the first time, by receiving the first indication information sent by the network device, sending a random access preamble to the network device based on the first indication information, measuring the second TA by the network device based on the random access preamble, and sending a random access response to the terminal, where the terminal determines the second TA based on the random access response. Or when the terminal determines the second TA of the candidate cell for the first time, the terminal further determines the second TA based on the time difference between the downlink reference signals sent by the serving cell and the candidate cell by receiving the first indication information sent by the network equipment.

In step S3, the terminal determines that the second TA is failed.

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

In step S4, the terminal determines a first TA.

In some embodiments, the specific implementation of determining the first TA of the candidate cell by the terminal may include three implementations as A, B, C shown in fig. 3A, where the terminal selects A, B, C one of the three implementations to determine the first TA based on the actual situation.

In one embodiment, a specific implementation manner of determining the first TA of the candidate cell by the terminal is shown as a in fig. 3A, which includes step S411:

in step S411, the terminal determines a first TA based on a time difference between the serving cell and the candidate cell for transmitting the downlink reference signal.

In another embodiment, a specific implementation manner of determining the first TA of the candidate cell by the terminal is shown as B in fig. 3A, and includes steps S421-S424:

in step S421, the network device transmits a random access preamble to the terminal.

In step S422, the network device measures the first TA.

In step S423, the network device transmits a random access response to the terminal.

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

In another embodiment, a specific implementation manner of determining the first TA of the candidate cell by the terminal is shown as C in fig. 3A, and includes steps S431-S433:

in step S431, the terminal transmits the second indication information and the third indication information to the network device.

In one embodiment, the second indication information is used to indicate that there is a second TA failure of the candidate cell, and the third indication information is used to indicate a cell identity of the candidate cell.

In step S432, the network device transmits first indication information to the terminal.

In step S433, the terminal determines a first TA based on the first indication information.

In the embodiment of the disclosure, after the terminal determines that the second TA between the candidate cell and the terminal fails, the terminal can actively determine the first TA between the candidate cell and the terminal, so that the validity of the TA between the terminal and the candidate cell is ensured, uplink synchronization is not required when the switching of the cells is executed, and the switching is completed more quickly.

Fig. 3B is a flowchart illustrating a TA determination method, as shown in fig. 3B, performed by a terminal according to an exemplary embodiment, including the following steps.

In step S11, a first TA is determined, where the first TA is a TA between a candidate cell and a terminal, and the candidate cell is a cell to which the terminal is not connected.

The determining the first TA may be that the terminal measures and determines 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.

In the embodiment of the 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, and because the candidate cell is a cell which is not accessed by the terminal, uplink synchronization is not needed when the switching of the cell is executed, and the switching is completed more quickly.

The trigger condition for determining the first TA by the trigger terminal is described below.

In the TA determining method provided in the embodiment of the present disclosure, the terminal does not receive the first indication information in the first time period, and triggers the terminal to determine the first TA, as shown in fig. 4, a flowchart of the TA determining method is provided, which includes step S21:

in step S21, the first indication information is not received in the first duration, and the trigger terminal determines the first TA.

In an embodiment, the first indication information is indication information sent by a serving cell of the network device, and is used for indicating or triggering the terminal to determine the first TA.

In the embodiment of the disclosure, if the terminal does not receive the first indication information within the first time period, the terminal triggers to determine the first TA without waiting for the first indication information sent by the network device, thereby ensuring the effectiveness of the first TA, and the terminal does not need to perform uplink synchronization when executing the cell handover, so that the handover is completed more quickly.

In the TA determining method provided in the embodiment of the present disclosure, after determining that the second TA between the terminal and the candidate cell fails, the terminal triggers the terminal to determine the first TA, as shown in fig. 5, and a flowchart of the TA determining method is provided, including step S31:

In step S31, after determining that the second TA is invalid, the trigger terminal determines the first TA.

In one embodiment, the second TA is a TA between the candidate cell and the terminal.

In one embodiment, the second TA may be understood as the current TA between the candidate cell and the terminal.

In the embodiment of the disclosure, if the terminal determines that the second TA fails, the terminal triggers to determine the first TA without waiting for the first indication information sent by the network device, so that the validity of the first TA is ensured, uplink synchronization is not required when the switching of the cell is executed, and the switching is completed more quickly.

In the TA determining method provided by the embodiment of the present disclosure, if the terminal does not receive the first indication information in the first time period, it can determine that the second TA is invalid.

In the TA determining method provided by the embodiment of the present disclosure, if the terminal does not receive the first indication information in the first time period, the second TA is determined to be invalid, and the first TA is determined. As shown in fig. 6, a flowchart of a TA determination method is provided, including the following steps:

in step S41, the first indication information is not received within the first time period, and it is determined that the second TA is invalid.

In step S42, the trigger terminal determines a first TA.

In the embodiment of the disclosure, if the terminal does not receive the first indication information within the first time period, it can determine that the second TA is invalid, so that in order to ensure the validity between the candidate cell and the terminal, the terminal triggers to determine the first TA, does not need to wait for the first indication information sent by the network device, does not need to perform uplink synchronization when executing the switching of the cell, and completes the switching more quickly.

In the TA determining method provided in the embodiments of the present disclosure, when the terminal receives the first indication information within the first time period, the terminal determines the first TA after receiving the first indication information. As shown in fig. 7, a flowchart of a TA determination method is provided, including the following steps:

in step S51, after receiving the first indication information within the first period, the first TA is determined.

In one embodiment, the network device may 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 approaches a certain candidate cell.

In the embodiment of the disclosure, if the terminal receives the first indication information in the first time period, the first TA can be determined based on the first indication information, so that the TA validity between the candidate cell and the terminal is ensured, and uplink synchronization is not required when the cell switching is performed, so that the switching is completed more quickly.

The determination procedure for determining the first TA by the terminal will be described below.

In the TA determining method provided by the embodiment of the present disclosure, a terminal sends indication information to a network device, the network device sends first indication information to the terminal based on the indication information, and the terminal determines a first TA based on the first indication information. As shown in fig. 8, a flowchart of a TA determination method is provided, including the following steps:

in step S61, second indication information is sent, where the second indication information is used to indicate that there is a second TA failure of the candidate cell.

In step S62, third indication information is transmitted, the third indication information being used to indicate cell identities of candidate cells.

In step S63, first indication information is received, and a first TA is determined.

In some embodiments, the terminal determines that the first indication information is not received or determines that the second TA is invalid within the first duration, and sends the second indication information and the third indication information to the network device, so as to trigger the network device to send the first indication information.

In some embodiments, the terminal may simultaneously transmit the second indication information and the third indication information; or, the terminal transmits the second indication information and the third indication information separately, which is not limited herein.

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 fourth indication information sent by the serving cell of the network device.

In the embodiment of the disclosure, the terminal sends the second indication information and the third indication information to the service cell of the network device, the network device issues the first indication information to instruct the terminal to determine the first TA, the validity of the first TA is ensured, uplink synchronization is not needed when the switching of the cell is executed, and the switching is completed more quickly.

In the TA determining method provided by the embodiment of the present disclosure, the second indication information is carried in a reserved scheduling request resource, where the scheduling request resource includes a resource dedicated to carrying the second indication information or a resource for beam failure recovery.

The network device may reserve a specific scheduling request resource for the terminal, where 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 for carrying the second indication information. Or, the network device does not reserve resources dedicated to bearing the second indication information for the terminal, and the terminal can multiplex the resources for beam failure recovery and feed back the second indication information on the resources for beam failure recovery.

In one embodiment, the second indication information may be a specific bit combination or bit sequence, etc., for indicating that there is a current TA failure of the candidate cell.

In the TA determining method provided by the embodiments of the present disclosure, the third indication information may be carried in a designated MAC CE, for example, the third indication information is fed back through the MAC CE on the first physical uplink shared channel (physical uplink shared channel, PUSCH) after the second indication information is fed back; or reporting the third indication information and the second indication information together.

In the TA determining method provided by the embodiment of the present disclosure, the first indication information may be downlink control information (Downlink control information, DCI) carrying PDCCH order; either newly designed signaling or TA command multiplexing of the serving cell.

In the TA determining method provided by the embodiment of the present disclosure, the terminal may determine the first TA based on a preset algorithm.

As shown in fig. 9, there is provided a flowchart of a TA determination method, including step S71:

in step S71, a first TA is determined based on the time difference between the downlink signals transmitted by the serving cell and the candidate cell.

In one embodiment, the time difference between the downlink signal transmissions from the serving cell and the candidate cell may be a fixed time difference preconfigured by the network device to the terminal.

Illustratively, the terminal determines the first TA of the candidate cell based on the time difference in downlink signal transmissions of the serving cell and the candidate cell and the TA of the serving cell. For example, the sum of the time difference and the TA of the serving cell or the difference between the time difference and the TA of the serving cell is the first TA of the candidate cell.

In some embodiments, the terminal determines that the first indication information sent by the network device is not received within a first duration, and the terminal determines the first TA based on a time difference between the downlink signals sent by the serving cell and the candidate cell.

In some embodiments, the terminal determines that the second TA is inactive and the terminal determines the first TA based on the time difference between the serving cell and the candidate cell for transmitting the downlink signal.

In some embodiments, the terminal receives first indication information sent by the network device, where the first indication information indicates that the terminal determines the first TA based on a time difference between sending downlink signals by the serving cell and the candidate cell, and the terminal determines the first TA based on a time difference between sending downlink signals by the serving cell and the candidate cell.

In the embodiment of the disclosure, the terminal can determine the first TA based on the terminal itself without using network equipment, so that the effectiveness of the first TA is ensured, uplink synchronization is not required when the switching of the cell is executed, and the switching is completed more quickly.

In the TA determining method provided by the embodiment of the present disclosure, the terminal sends the random access preamble to the candidate cell, so that the network device measures the first TA.

As shown in fig. 10, a flowchart of a TA determination method is provided, including the following steps:

in step S81, a random access preamble is transmitted to the candidate cell.

In one embodiment, a terminal transmits a random access preamble (preamble) sequence on a random access channel (Random Access Channel, RACH) to a candidate cell.

In step S82, a random access response is received.

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

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

In some embodiments, the terminal determines that the second TA fails and the terminal sends a random access preamble to the candidate cell.

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

In the embodiment of the disclosure, the terminal can send the random access preamble to the candidate cell, the network equipment measures the first TA, the terminal determines the first TA by receiving the random access response sent by the network equipment, and uplink synchronization is not needed when the switching of the cell is executed, so that the switching is completed more quickly.

In the TA determining method provided in the embodiments of the present disclosure, a method for determining, by a terminal, a first TA based on a capability of the terminal.

For example, when the terminal supports determining the first TA based on the preset algorithm, the terminal may determine the first TA based on the preset algorithm, or the network device may trigger the terminal to determine the first TA by the preset algorithm through the first indication information, or the network device may instruct 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 to determine the first TA through the preset algorithm, the terminal can determine the first TA by initiating the random access preamble to the candidate cell, or the network equipment indicates the terminal to initiate the random access preamble to the candidate cell through the first indication information to determine the first TA.

In the embodiment of the disclosure, the terminal determines whether the terminal calculates the TA of the candidate cell or initiates a random access process to the candidate cell based on the first indication information to trigger the network equipment to measure the TA of the candidate cell, so that the validity of the TA of the candidate cell is ensured, uplink synchronization is not needed when the switching of the cell is executed, and the switching is completed more quickly.

In one TA determining method provided in an embodiment of the present disclosure, a first time length is determined based on a timer.

In the TA determining method provided by the embodiment of the present disclosure, the terminal first receives the first indication information, and the timer determines to start timing based on at least one of the following modes:

after the terminal receives the first indication information for the first time, a timer starts to count;

the terminal receives the first indication information for the first time, and a timer starts to count after the terminal sends a preamble sequence;

the terminal receives the first indication information for the first time, and after the terminal determines the first TA based on a preset algorithm, the timer starts to count.

In the TA determining method provided by the embodiment of the present disclosure, the terminal receives the first indication information in the first time period, and the timer determines to end the current timing and restart the timing based on at least one of the following manners:

after the terminal sends the preamble sequence, the timer finishes the current timing and restarts the timing;

after the terminal determines the first TA based on a preset algorithm, ending the current timing by the timer and restarting the timing;

in the TA determining method provided by the embodiment of the present disclosure, the terminal does not receive the first indication information in the first time period, and the timer determines to end the current timing and restart the timing based on at least one of the following manners:

It should be noted that, the timer start timing or the timer restart timing in the above three cases is not limited to the above-mentioned embodiments, but may include any other reasonable embodiments, and the embodiments of the present disclosure are not limited herein. The setting time of the timer is not limited to a predetermined value, and the setting time of the timer may be adjusted based on actual conditions.

Based on the same conception, the embodiments of the present disclosure also provide a TA determining method, which is performed by the network device.

Fig. 11 is a flowchart illustrating a TA determination method according to an exemplary embodiment, which is performed by a network device as shown in fig. 11, including the following steps.

In step S91, first indication information is sent, where the first indication information is used to instruct or trigger the terminal to determine a first TA, where the first TA is a TA between a candidate cell and the terminal, and the candidate cell is a cell that is not accessed by the terminal.

The network equipment sends first indication information to the terminal through the service cell.

In the embodiment of the disclosure, the network device indicates or triggers the terminal to determine the first TA of the candidate cell by sending the first indication information to the terminal, so as to improve the validity of the TA of the candidate cell.

In some embodiments, the network device may 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.

In the TA determining method provided in the embodiments of the present disclosure, when a random access preamble sent by a terminal is received, a first TA is measured.

As shown in fig. 12, fig. 12 is a flowchart illustrating a TA determination method according to an exemplary embodiment, including the following steps.

In step S1001, a random access preamble is received.

In step S1002, a first TA is measured based on a random access preamble.

In step S1003, a random access response is transmitted.

The specific implementation procedures of steps S1001 to S1003 may refer to the specific implementation procedures of steps S81 to S83 described above, and the embodiments of the present disclosure will not be described herein.

Fig. 13 is a flowchart of a TA determination method according to an exemplary embodiment, as shown in fig. 13, including the following steps.

In step S1101, second indication information and third indication information sent by the terminal are received, where the second indication information is used to indicate that there is a current TA failure of the candidate cell, and the third indication information is used to indicate a cell identifier of the candidate cell.

In step S1102, first instruction information is transmitted.

The specific implementation procedures of steps S1101 to S1102 may refer to the specific implementation procedures of steps S61 to S63 described above, and the embodiments of the present disclosure will not be described herein.

In the TA determining method provided by the embodiment of the present disclosure, the third indication information may be carried in a designated MAC CE, for example, the third indication information is fed back through the MAC CE on the first PUSCH after the second indication information is fed back; or reporting the third indication information and the second indication information together.

It should be understood by those skilled in the art that the various implementations/embodiments of the present disclosure may be used in combination with the foregoing embodiments or may be used independently. Whether used alone or in combination with the previous embodiments, the principles of implementation are similar. In the practice of the present disclosure, some of the examples are described in terms of implementations that are used together. Of course, those skilled in the art will appreciate that such illustration is not limiting of the disclosed embodiments.

Based on the same conception, the embodiment of the disclosure also provides a TA determining device.

It can be understood that, in order to implement the above-mentioned functions, the TA determining device provided in the embodiments of the present disclosure includes a hardware structure and/or a software module that perform each function. The disclosed embodiments may be implemented in hardware or a combination of hardware and computer software, in combination with the various example elements and algorithm steps disclosed in the embodiments of the disclosure. Whether a function is implemented as hardware or computer software driven hardware depends upon the particular application and design constraints imposed on the solution. Those skilled in the art may implement the described functionality using different approaches for each particular application, but such implementation is not to be considered as beyond the scope of the embodiments of the present disclosure.

Fig. 14 is a block diagram of a TA determining device according to an example embodiment. Referring to fig. 14, the apparatus includes a processing module 101.

The processing module 101 is configured to determine a first timing advance TA, where the first TA is a TA between a candidate cell and a terminal, and the candidate cell is a cell that is not accessed by the terminal.

In an embodiment, the processing module 101 is configured to trigger the terminal to determine the first TA when the first indication information is not received within the first period.

In an embodiment, the processing module 101 is configured to trigger the terminal to determine the first TA after determining that the second TA is invalid, where the second TA is a TA between the candidate cell and the terminal.

In one embodiment, the second TA fails in response to not receiving the first indication information within the first time period.

In one embodiment, the processing module 101 is configured to determine the first TA after receiving the first indication information within the first time period.

In one embodiment, the apparatus further comprises a transmitting module 102 and a receiving module 103. A sending module 102, configured to send second indication information, where the second indication information is used to indicate that a second TA of the candidate cell is invalid;

a sending module 102, configured to send third indication information, where the third indication information is used to indicate a cell identifier of a candidate cell;

A receiving module 103, configured to receive the first indication information and determine a first TA.

In one embodiment, the second indication information is carried in reserved scheduling request resources, which comprise resources dedicated to carrying the second indication information or resources for beam failure recovery.

In one embodiment, the processing module 101 is configured to determine the first TA based on a first downlink signal, where the first downlink signal is sent by the candidate cell.

In one embodiment, the sending module 102 is configured to send a random access preamble to a candidate cell;

a receiving module 103, configured to receive a random access response;

a processing module 101 is configured to determine a first TA based on the random access response.

In one embodiment, the first time period is determined based on a timer.

In one embodiment, the timer determines to begin counting based on at least one of:

after the terminal sends the preamble sequence, a timer starts to count;

after the terminal determines the first TA based on a preset algorithm, a timer starts to count.

Fig. 15 is a block diagram of a TA determining device according to an example embodiment. Referring to fig. 15, the apparatus includes a transmission module 201.

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

In one embodiment, the apparatus includes a receiving module 202 and a processing module 203.

A receiving module 202, configured to receive a random access preamble;

a processing module 203, configured to measure the first TA based on the random access preamble;

a transmitting module 201, configured to transmit a random access response.

In an implementation manner, the receiving module 202 is configured to receive second indication information and third indication information sent by a terminal, where the second indication information is used to indicate that there is a current TA failure of a candidate cell, and the third indication information is used to indicate a cell identifier of the candidate cell;

A sending module 201, configured to send the first indication information.

The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.

Fig. 16 is a block diagram illustrating an apparatus 300 for TA determination according to an example embodiment. The apparatus 300 may be provided as a terminal. For example, apparatus 300 may be a mobile phone, computer, digital broadcast terminal, messaging device, game console, tablet device, medical device, exercise device, personal digital assistant, or the like.

Referring to fig. 16, the apparatus 300 may 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.

The processing component 302 generally controls overall operation of the apparatus 300, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing component 302 may include one or more processors 320 to execute instructions to perform all or part of the steps of the methods described above. Further, the processing component 302 can include one or more modules that facilitate interactions between the processing component 302 and other components. For example, the processing component 302 may include a multimedia module to facilitate interaction between the multimedia component 308 and the processing component 302.

Memory 304 is configured to store various types of data to support operations at apparatus 300. Examples of such data include instructions for any application or method operating on the device 300, contact data, phonebook data, messages, pictures, videos, and the like. The memory 304 may be implemented by any type or combination of volatile or nonvolatile memory devices 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 or optical disk.

The power component 306 provides power to the various components of the device 300. The power components 306 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for the device 300.

The multimedia component 308 includes a screen between the device 300 and the user that provides an output interface. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from a user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may sense not only the boundary of a touch or slide action, but also the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 308 includes a front-facing camera and/or a rear-facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the apparatus 300 is in an operational mode, such as a photographing mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

The audio component 310 is configured to output and/or input audio signals. For example, the audio component 310 includes a Microphone (MIC) configured to receive external audio signals when the device 300 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may be further stored in the memory 304 or transmitted via the communication component 316. In some embodiments, audio component 310 further comprises a speaker for outputting audio signals.

The I/O interface 312 provides an interface between the processing component 302 and peripheral interface modules, which may be a keyboard, click wheel, buttons, etc. These buttons may include, but are not limited to: homepage button, volume button, start button, and lock button.

The sensor assembly 314 includes one or more sensors for providing status assessment of various aspects of the apparatus 300. For example, the sensor assembly 314 may detect the on/off state of the device 300, the relative positioning of the components, such as the display and keypad of the device 300, the sensor assembly 314 may also detect a change in position of the device 300 or a component of the device 300, the presence or absence of user contact with the device 300, the orientation or acceleration/deceleration of the device 300, and a change in temperature of the device 300. The sensor assembly 314 may include a proximity sensor configured to detect the presence of nearby objects in the absence of any physical contact. The sensor assembly 314 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 314 may also include an acceleration sensor, a gyroscopic sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 316 is configured to facilitate communication between the apparatus 300 and other devices, either wired or wireless. The device 300 may access a wireless network based on a communication standard, such as WiFi,2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 316 receives broadcast signals 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 communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the apparatus 300 may 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, microcontrollers, microprocessors, or other electronic elements for executing the methods described above.

In an exemplary embodiment, a non-transitory computer readable storage medium is also provided, such as memory 304, including instructions executable by processor 320 of apparatus 300 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

Fig. 17 is a block diagram illustrating an apparatus 400 for TA determination according to an example embodiment. For example, the apparatus 400 may be provided as a network device. Referring to fig. 17, the apparatus 400 includes a processing component 422 that further includes one or more processors, and memory resources represented by memory 432, for storing instructions, such as applications, executable by the processing component 422. The application program stored in memory 432 may include one or more modules each corresponding to a set of instructions. Further, the processing component 422 is configured to execute instructions to perform the above-described methods.

The apparatus 400 may also include a power component 426 configured to perform power management of 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 may operate based on an operating system stored in the memory 432, such as Windows Server, mac OS XTM, unixTM, linuxTM, freeBSDTM or the like.

In an exemplary embodiment, a non-transitory computer-readable storage medium is also provided, such as a memory 432, comprising instructions executable by the processing component 422 of the apparatus 400 to perform the above-described method. For example, the non-transitory computer readable storage medium may be ROM, random Access Memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

It is further understood that the term "plurality" in this disclosure means two or more, and other adjectives are similar thereto. "and/or", describes an association relationship of an association object, and indicates that there may be three relationships, for example, a and/or B, and may indicate: a exists alone, A and B exist together, and B exists alone. The character "/" generally indicates that the context-dependent object is an "or" relationship. The singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It will be further understood that the meaning of the terms "responsive to", "if", etc., referred to in this disclosure, depends on the context and actual usage scenario, as the term "responsive to" as used herein may be interpreted as "at … …" or "at … …" or "if".

It is further understood that the terms "first," "second," and the like are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish one type of information from another and do not denote a particular order or importance. Indeed, the expressions "first", "second", etc. may be used entirely interchangeably. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present disclosure.

It will be further understood that although operations are depicted in the drawings in a particular order, this should not be understood as requiring that such operations be performed in the particular order shown or in sequential order, or that all illustrated operations be performed, to achieve desirable results. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any adaptations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains.

It is to be understood that the present disclosure is not limited to the precise arrangements and instrumentalities shown in the drawings, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the present disclosure is limited only by the scope of the appended claims.

Claims

1. A method of timing advance determination, performed by a terminal, the method comprising:

and determining a first timing advance TA, wherein the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

2. The method of claim 1, wherein the determining the first TA comprises:

3. The method of claim 1, wherein the determining the first TA comprises:

4. The method of claim 3, wherein the second TA is disabled in response to not receiving the first indication information within a first time period.

5. The method of claim 1, wherein the determining the first TA comprises:

and after receiving the first indication information in the first time period, determining the first TA.

6. The method according to any one of claims 2 to 4, wherein said determining said first TA comprises:

and receiving first indication information and determining the first TA.

7. The method of claim 6, wherein the second indication information is carried in reserved scheduling request resources, the scheduling request resources comprising resources dedicated to carrying the second indication information or resources for beam failure recovery.

8. The method according to any one of claims 2 to 5, wherein said determining said first TA comprises:

the first TA is determined based on a time difference between the downlink reference signals transmitted by the serving cell and the candidate cell.

9. The method according to any one of claims 2 to 5, wherein said determining said first TA comprises:

transmitting a random access preamble to the candidate cell;

receiving a random access response;

the first TA is determined based on the random access response.

10. The method according to any of claims 2 to 9, wherein the first time period is determined based on a timer.

11. The method of claim 10, wherein the timer determines the start timing based on at least one of:

after the terminal sends the preamble sequence, the timer starts to count;

12. The method of claim 10 or 11, wherein the timer determines to end the current timing and to restart the timing based on at least one of:

13. A method of timing advance determination performed by a network device, the method comprising:

and sending first indication information, wherein the first indication information is used for indicating or triggering a terminal to determine a first Timing Advance (TA), the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

14. The method of claim 13, wherein the method further comprises:

Receiving a random access preamble;

measuring the first TA based on the random access preamble;

and sending a random access response.

15. The method according to claim 13 or 14, wherein the transmitting the first indication information comprises:

and sending the first indication information.

16. The method of claim 15, wherein the second indication information is carried in reserved scheduling request resources, the scheduling request resources comprising resources dedicated to carrying the second indication information or resources for beam failure recovery.

17. A timing advance determination apparatus, the apparatus comprising:

the processing module is used for determining a first timing advance TA, wherein the first TA is the TA between a candidate cell and a terminal, and the candidate cell is a cell which is not accessed by the terminal.

18. A timing advance determination apparatus, the apparatus comprising:

The terminal comprises a sending module, a receiving module and a receiving module, wherein the sending module is used for sending first indication information, the first indication information is used for indicating or triggering a terminal to determine a first Timing Advance (TA), the first TA is the TA between a candidate cell and the terminal, and the candidate cell is a cell which is not accessed by the terminal.

19. A timing advance determination apparatus, comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to: the timing advance determination method of any one of claims 1 to 12 is performed.

20. A timing advance determination apparatus, comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to: the timing advance determination method of any one of claims 13 to 16 is performed.

21. A storage medium having instructions stored therein which, when executed by a processor of a terminal, enable the terminal to perform the timing advance determination method of any one of claims 1 to 12.

22. A storage medium having instructions stored therein that, when executed by a processor of a network device, enable the network device to perform the timing advance determination method of any one of claims 13 to 16.