Uplink synchronization methods and tools, uplink synchronization equipment, storage intermediaries, computer software products, and computer programs.

Abstract

Invention details;

Description

Uplink synchronization method, device and related equipment

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese application No. 2022106009216 filed in China on May 30, 2022 and priority to international application No. PCT / CN2023 / 082253 filed with the World Intellectual Property Organization on March 17, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the technical field of wireless communications, and in particular to an uplink synchronization method, apparatus, and related equipment. Background Art

[0004] In related technologies, during a cell switching process, a terminal device first switches from a serving cell to a target cell, performs uplink access in the target cell to obtain timing advance (TA) information, and then performs uplink synchronization according to the TA information indicated by the network device.

[0005] However, the above method of obtaining TA information after cell switching may cause the terminal device to be unable to perform uplink synchronization in time because it takes a certain amount of time to obtain the TA information.

[0006] Summary of the Invention

[0007] The embodiments of the present disclosure provide a method and apparatus for uplink synchronization and related equipment.

[0008] According to an embodiment of one aspect of the present disclosure, an uplink synchronization method is provided, which is executed by a terminal device, and the method includes: sending an uplink reference signal to a network device of at least one candidate cell, wherein the uplink reference signal is configured by a network device of a service cell where the terminal device is located, and is used by the network device of the at least one candidate cell to determine timing advance TA information; receiving TA indication information sent by the network device of the service cell where the terminal device is located; wherein the TA indication information sent by the network device of the service cell includes at least: TA information of a target cell in the at least one candidate cell to which the terminal device is to switch; and the network device based on the service cell instructs the terminal device to switch to the target cell, and performs uplink synchronization according to the TA information of the target cell.

[0009] In some embodiments, the uplink reference signal includes at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0010] In some embodiments, the receiving of TA indication information sent by the network device of the service cell where the terminal device is located includes: receiving the first switching instruction sent by the network device of the service cell where the terminal device is located, wherein the first switching instruction is used to instruct the terminal device to switch to the target cell among the at least one candidate cell; the first switching instruction carries the TA indication information, and the TA indication information includes the cell indication information of the target cell and the TA information of the target cell.

[0011] In some embodiments, the receiving of TA indication information sent by the network device of the service cell where the terminal device is located includes: receiving a first indication message sent by the network device of the service cell where the terminal device is located, wherein the first indication message is used to instruct the terminal device to store or update the TA information of the at least one candidate cell; the first indication message carries the TA indication information, and the TA indication information includes the cell indication information of the at least one candidate cell, and the TA information of the at least one candidate cell.

[0012] In some embodiments, the receiving of TA indication information sent by the network device of the service cell where the terminal device is located includes: receiving a random access message sent by the network device of the service cell where the terminal device is located, wherein the random access message is sent by the network device of the at least one candidate cell to the network device of the service cell, carrying the TA indication information; the TA indication information includes the cell indication information of the at least one candidate cell, and the TA information of the at least one candidate cell.

[0013] In some embodiments, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel, or a cell index.

[0014] In some embodiments, the TA information includes a TA value or a TA group.

[0015] In some embodiments, the first indication message is a MAC-CE message, or a DCI message.

[0016] In some embodiments, after receiving the first indication message sent by the network device of the service cell where the terminal device is located, it also includes: receiving a second switching instruction sent by the network device of the service cell where the terminal device is located, wherein the second switching instruction is used to instruct the terminal device to switch to the target cell; the second switching instruction carries the cell indication information of the target cell.

[0017] In some embodiments, the receiving of the first indication message sent by the network device of the serving cell includes: receiving the first indication message periodically sent by the network device of the serving cell; wherein the periodically sent first indication message is generated based on the TA information periodically determined by the network device of the at least one candidate cell; the method also includes: periodically updating the TA information of the at least one candidate cell based on the periodically received first indication message.

[0018] In some embodiments, the method includes: receiving a second indication message sent by the network equipment of the serving cell; wherein the second indication message is used to indicate multiple neighboring cells of the serving cell; according to the second indication message, measuring the multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells; sending the measurement result parameters of the multiple neighboring cells to the network equipment of the serving cell; wherein the measurement result parameters are used by the network equipment of the serving cell to determine the at least one candidate cell from the multiple neighboring cells; and receiving a third indication message sent by the network equipment of the serving cell, wherein the third indication message is used to instruct the terminal equipment to send the uplink reference signal to the network equipment of the at least one candidate cell.

[0019] In some embodiments, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0020] In some embodiments, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; the sending of the uplink reference signal to the network equipment of at least one candidate cell includes: based on the power control parameter information being the initial transmission, sending the uplink reference signal to the network equipment of at least one candidate cell at the set power corresponding to the initial transmission; based on the power control parameter information being the retransmission, sending the uplink reference signal to the network equipment of at least one candidate cell according to the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information.

[0021] In some embodiments, the power control parameter information includes power increase information; the sending of an uplink reference signal to the network equipment of at least one candidate cell includes: sending the uplink reference signal to the network equipment of at least one candidate cell based on the sending power of the previous uplink reference signal and the sending power determined by the power increase information.

[0022] In some embodiments, the method further includes: receiving a second indication message sent by the network device of the serving cell; wherein the second indication message is used to indicate multiple neighboring cells of the serving cell; according to the second indication message, measuring the multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells; and determining the at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0023] In some embodiments, the at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to a set offset; wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0024] In some embodiments, the uplink synchronization according to the TA information of the target cell includes: adjusting the transmission time of the physical layer uplink shared channel PUSCH transmission based on the downlink reference timing of the terminal device and using the TA information of the target cell.

[0025] According to an embodiment of another aspect of the present disclosure, an uplink synchronization method is provided, which is executed by a network device of a service cell where a terminal device is located, the method comprising: receiving timing advance TA information sent by a network device of at least one candidate cell; wherein the TA information of the at least one candidate cell is determined based on an uplink reference signal sent by the terminal device; and sending TA indication information to the terminal device based on the TA information of the at least one candidate cell; wherein the TA indication information sent to the terminal device includes at least: TA information of a target cell in the at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used by the terminal device to instruct the terminal device to switch to the target cell based on the network device of the service cell for uplink synchronization.

[0026] In some embodiments, the uplink reference signal includes at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0027] In some embodiments, sending TA indication information to the terminal device based on the TA information of the at least one candidate cell includes: sending a first switching instruction to the terminal device based on the TA information of the target cell in the at least one candidate cell; wherein the first switching instruction is used to instruct the terminal device to switch to the target cell in the at least one candidate cell; the first switching instruction carries the TA indication information, and the TA indication information includes the cell indication information of the target cell and the TA information of the target cell.

[0028] In some embodiments, sending TA indication information to the terminal device based on the TA information of the at least one candidate cell includes: sending a first indication message to the terminal device based on the TA information of the at least one candidate cell; wherein the first indication message is used to instruct the terminal device to store or update the TA information of the at least one candidate cell; the first indication message carries the TA indication information, and the TA indication information includes the cell indication information of the at least one candidate cell and the TA information of the at least one candidate cell.

[0029] In some embodiments, sending TA indication information to the terminal device based on the TA information of the at least one candidate cell includes: sending a random access message to the terminal device, wherein the random access message is sent by the network device of the at least one candidate cell to the network device of the server cell, carrying the TA indication information; the TA indication information includes the cell indication information of the at least one candidate cell, and the TA information of the at least one candidate cell.

[0030] In some embodiments, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel, or a cell index.

[0031] In some embodiments, the TA information includes a TA value or a TA group.

[0032] In some embodiments, the first indication message is a MAC-CE message, or a DCI message.

[0033] In some embodiments, after sending the first indication message to the terminal device based on the TA information of the at least one candidate cell, the method further includes: sending a second switching instruction to the terminal device; wherein the second switching instruction is used to instruct the terminal device to switch to the target cell; the second switching instruction carries the cell indication information of the target cell.

[0034] In some embodiments, sending the first indication message to the terminal device based on the TA information of the at least one candidate cell includes: periodically sending the first indication message to the terminal device based on the TA information periodically determined by the network device of the at least one candidate cell.

[0035] In some embodiments, the method further includes: sending a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple adjacent cells of the service cell to obtain measurement result parameters of the multiple adjacent cells; receiving the measurement result parameters of the multiple adjacent cells sent by the terminal device; determining the at least one candidate cell from the multiple adjacent cells based on the measurement result parameters; and sending a third indication message to the terminal device, wherein the third indication message is used to instruct the terminal device to send the uplink reference signal to the network device of the at least one candidate cell.

[0036] In some embodiments, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0037] In some embodiments, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; based on the power control parameter information being the initial transmission, it is used to indicate that the uplink reference signal is sent to the network equipment of at least one candidate cell at the set power corresponding to the initial transmission; based on the power control parameter information being the retransmission, it is used to indicate that the uplink reference signal is sent to the network equipment of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information.

[0038] In some embodiments, the power control parameter information includes power increase information; the power increase information is used to send the uplink reference signal to the network equipment of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the power increase information.

[0039] In some embodiments, the method further includes: sending a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple neighboring cells of the service cell to obtain measurement result parameters of the multiple neighboring cells, and determine the at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0040] In some embodiments, the at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to a set offset; wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0041] According to an embodiment of another aspect of the present disclosure, a terminal device is provided, including a memory, a transceiver, and a processor: the memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations: sending an uplink reference signal to a network device of at least one candidate cell, wherein the uplink reference signal is configured by a network device of a service cell where the terminal device is located, and is used by the network device of the at least one candidate cell to determine timing advance TA information; receiving TA indication information sent by the network device of the service cell where the terminal device is located; wherein the TA indication information sent by the network device of the service cell includes at least: TA information of a target cell in the at least one candidate cell to which the terminal device is to switch; and the network device based on the service cell instructs the terminal device to switch to the target cell, and performs uplink synchronization according to the TA information of the target cell.

[0042] According to an embodiment of another aspect of the present disclosure, a network device of a service cell where a terminal device is located is provided, comprising a memory, a transceiver, and a processor: the memory is used to store a computer program; the transceiver is used to send and receive data under the control of the processor; the processor is used to read the computer program in the memory and perform the following operations: receiving timing advance TA information sent by a network device of at least one candidate cell; wherein the TA information of the at least one candidate cell is determined based on an uplink reference signal sent by the terminal device; and sending TA indication information to the terminal device based on the TA information of the at least one candidate cell; wherein the TA indication information sent to the terminal device includes at least: TA information of a target cell in the at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used by the terminal device to instruct the terminal device to switch to the target cell based on the network device of the service cell for uplink synchronization.

[0043] According to an embodiment of another aspect of the present disclosure, an uplink synchronization device is provided, including: a sending unit, used to send an uplink reference signal to a network device of at least one candidate cell, wherein the uplink reference signal is configured by the network device of the service cell where the terminal device is located, and is used by the network device of the at least one candidate cell to determine timing advance TA information; a receiving unit, used to receive TA indication information sent by the network device of the service cell where the terminal device is located; wherein the TA indication information sent by the network device of the service cell includes at least: TA information of a target cell in the at least one candidate cell to which the terminal device is to switch; and a synchronization unit, used to instruct the terminal device to switch to the target cell based on the network device of the service cell, and perform uplink synchronization according to the TA information of the target cell.

[0044] According to an embodiment of another aspect of the present disclosure, an uplink synchronization device is provided, comprising: a receiving unit for receiving timing advance TA information sent by a network device of at least one candidate cell; wherein the TA information of the at least one candidate cell is determined based on an uplink reference signal sent by a terminal device; and a sending unit for sending TA indication information to the terminal device based on the TA information of the at least one candidate cell; wherein the TA indication information sent to the terminal device includes at least: TA information of a target cell in the at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used by the terminal device to instruct the terminal device to switch to the target cell based on the network device of the serving cell for uplink synchronization.

[0045] According to another embodiment of the present disclosure, a processor-readable storage medium is provided, wherein the processor-readable storage medium stores a computer program, and the computer program is used to enable the processor to execute the uplink synchronization method described in any of the above embodiments.

[0046] According to another embodiment of the present disclosure, a computer program product is provided, including a computer program, which implements the uplink synchronization method described in any of the above embodiments of the present disclosure when executed by a processor.

[0047] According to another embodiment of the present disclosure, a computer program is provided, comprising computer program code. When the computer program code is run on a computer, the computer is enabled to execute the uplink synchronization method described in any of the above embodiments of the present disclosure.

[0048] The technical solution disclosed in the present invention sends an uplink reference signal to the network equipment of at least one candidate cell, wherein the uplink reference signal is configured by the network equipment of the service cell where the terminal device is located, and is used by the network equipment of the at least one candidate cell to determine the timing advance TA information; receives the TA indication information sent by the network equipment of the service cell where the terminal device is located; wherein the TA indication information sent by the network equipment of the service cell at least includes: the TA information of the target cell in at least one candidate cell to which the terminal device is to switch; and the network equipment based on the service cell instructs the terminal device to switch to the target cell, and performs uplink synchronization according to the TA information of the target cell. Therefore, before the terminal device performs cell switching, the terminal device sends the uplink reference signal pre-configured by the network equipment of the service cell where it is located, so that the network equipment of at least one candidate cell determines the TA information according to the uplink reference signal, and obtains the TA information of the target cell in at least one candidate cell to which the terminal device is to switch from the TA indication information sent by the network equipment of the service cell where the terminal device is located, so that the terminal device can perform uplink synchronization in a timely manner according to the pre-acquired TA information after the cell switching.

[0049] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings are provided to facilitate a better understanding of the present invention and do not constitute a limitation of the present disclosure.

[0051] FIG1 is a schematic diagram of a MAC RAR provided by an embodiment of the present disclosure;

[0052] FIG2 is a schematic diagram of a time adjustment for physical uplink shared channel transmission provided by an embodiment of the present disclosure;

[0053] FIG3 is a schematic diagram of a MAC-CE message provided by an embodiment of the present disclosure;

[0054] FIG4 is a schematic diagram of a flow chart of an uplink synchronization method provided by an embodiment of the present disclosure;

[0055] FIG5 is a schematic diagram of a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure;

[0056] FIG6 is a schematic diagram of the structure of TA indication information provided by an embodiment of the present disclosure;

[0057] FIG7 is a schematic diagram of a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure;

[0058] FIG8 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure;

[0059] FIG9 is a schematic flow chart of another uplink synchronization method provided by an embodiment of the present disclosure;

[0060] FIG10 is a schematic diagram of a flow chart of another uplink synchronization method provided in an embodiment of the present disclosure;

[0061] FIG11 is a schematic flow chart of another uplink synchronization method provided in an embodiment of the present disclosure;

[0062] FIG12 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure;

[0063] FIG13 is a schematic diagram of another MAC-CE message provided in an embodiment of the present disclosure;

[0064] FIG14 is a schematic diagram of the correspondence between indication information of a cell and PCI provided in an embodiment of the present disclosure;

[0065] FIG15 is a schematic diagram of a flow chart of another uplink synchronization method provided in an embodiment of the present disclosure;

[0066] FIG16 is a schematic structural diagram of a terminal device provided in an embodiment of the present disclosure;

[0067] FIG17 is a schematic diagram of the structure of a network device in a serving cell provided by an embodiment of the present disclosure;

[0068] FIG18 is a schematic structural diagram of an uplink synchronization device provided in an embodiment of the present disclosure;

[0069] FIG19 is a schematic structural diagram of an uplink synchronization device provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0070] In the embodiments of the present disclosure, the term "and / or" describes the association relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0071] In the embodiments of the present disclosure, the term "plurality" refers to two or more than two, and other quantifiers are similar thereto.

[0072] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of this application and not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of this disclosure.

[0073] In related technologies, during a cell handover, a terminal device first switches from a serving cell to a target cell, performs uplink access in the target cell to obtain timing advance (TA) information, and then performs uplink synchronization according to the TA information indicated by the network device. The steps may be as follows:

[0074] 1. During initial access, the terminal obtains the Random Access Channel (RACH) configuration and determines the time and frequency resources for sending the preamble signal [TS38.213] according to the RACH channel configuration at the sending time of the Physical Random Access Channel (PRACH) to perform uplink access. The terminal device then receives the RAR MAC protocol data unit (PDU) replied by the base station within the RA Response window. The TA used for initial uplink synchronization is carried on the RAR MAC PDU. As shown in FIG1 , FIG1 is a schematic diagram of a MAC RAR provided by an embodiment of the present disclosure. In FIG1 , the MAC RAR is 7 bytes, and R in FIG1 represents a 1-byte reserved bit. The TA indication information (TA command (12 bits)) in the MAC RAR is used to indicate the TA used for uplink synchronization of the terminal.

[0075] 2. The terminal device calculates the absolute time adjustment N according to the instructions of the network device in the TA indication information TA And based on the downlink reception timing, the Physical Uplink Shared Channel (PUSCH) for uplink transmission of MSG3 is adjusted [TS38.213, section 4.2], that is, the Physical Downlink Shared Channel (PDSCH) for downlink reception is advanced by N TA Send MSG3 at all times, absolute time adjustment N TA The calculation of N is as follows: TA =TA*16*64 / 2 u ;

[0076] Where, TA=0,1,2,…,3846,2 u *15KHz represents the subcarrier spacing. The adjustment process can be shown in Figure 2. The starting position of the uplink i-th frame transmission is T ahead of the starting position of the downlink i-th frame transmission. TA =(N TA +N TA,offset )T CWhere N TA,offset Depends on the duplex mode and frequency band of the uplink transmission [TS38.133], which is configured by the network device to the terminal device through indication information or provided by a predefined table. C It is the basic time unit, and its value is 1 / (4096*480000)s=0.509ns;

[0077] 3. During data transmission, if a network device detects an uplink loss of synchronization, it detects the timing adjustment amount using uplink reference signals (e.g., sounding reference signal and demodulation reference signal) and performs uplink synchronization fine-tuning by sending a MAC-CE message. A MAC-CE message may be shown in Figure 3.

[0078] Among them, TA information is adjusted in units of Timing Advance Group (TAG). The TAG ID implicitly indicates the component carrier (CC) to be adjusted using the TA information. The network device associates a group of CCs with the TAG ID through Radio Resource Control (RRC) signaling. After receiving the instruction information from the network device, the terminal device calculates the uplink time adjustment amount according to the following formula and obtains N TA_new : N TA_new =N TA_old +(TA-31)*16*64 / 2 u ;

[0079] Among them, TA = 0, 1, 2, 3…, 63, u is a parameter describing the subcarrier spacing, and u = 0, 1, 2 represent the subcarrier spacing of 15 kHz, 30 kHz, and 60 kHz respectively.

[0080] However, this method of switching first and then obtaining TA through uplink access may cause a relatively large delay, especially when the terminal device frequently switches cells, which greatly increases the delay caused by the switching process.

[0081] Therefore, in order to solve the above problems, the embodiments of the present disclosure provide an uplink synchronization method, an apparatus and related equipment thereof, wherein the method and the apparatus are based on the same application concept. Since the principles of solving the problems by the method and the apparatus are similar, the implementation of the apparatus and the method can refer to each other, and the repeated parts will not be repeated.

[0082] The uplink synchronization method, apparatus, and related devices provided by the embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

[0083] FIG4 is a schematic flow chart of an uplink synchronization method provided in an embodiment of the present disclosure.

[0084] It should be noted that the uplink synchronization method of the embodiment of the present disclosure can be executed by a terminal device.

[0085] As shown in FIG4 , the uplink synchronization method may include steps 401 to 403:

[0086] Step 401: Send an uplink reference signal to a network device of at least one candidate cell.

[0087] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0088] In an embodiment of the present disclosure, a terminal device may send an uplink reference signal pre-configured by a network device of a serving cell where the terminal device is located to a network device of at least one candidate cell. The network device of at least one candidate cell may determine timing advance (TA) information based on the uplink reference signal, and the network device of at least one candidate cell may send the TA information to the network device of the serving cell where the terminal device is located.

[0089] It should be noted that the uplink reference signal may include at least one of the following: a preamble signal; or a sounding reference signal (SRS); or a demodulation reference signal (DMRS); or an uplink signal transmitted based on a physical uplink control channel (PUCCH).

[0090] Step 402: Receive TA indication information sent by the network equipment of the service cell where the terminal equipment is located.

[0091] The TA indication information sent by the network equipment of the serving cell includes at least: TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch.

[0092] In an embodiment of the present disclosure, the network device of the service cell where the terminal device is located sends TA indication information to the terminal device, wherein the TA indication information sent by the network device of the service cell includes at least: TA information of the target cell in at least one candidate cell to which the terminal device is to switch.

[0093] As an example, the TA indication information sent by the network device of the serving cell includes TA information of the target cell in at least one candidate cell to which the terminal device is to switch.

[0094] As another example, the TA indication information sent by the network device of the serving cell may include the TA information of the target cell in at least one candidate cell to which the terminal device is to switch, and may also include the TA information of other candidate cells except the target cell.

[0095] Step 403: The network device based on the serving cell instructs the terminal device to switch to the target cell and performs uplink synchronization according to the TA information of the target cell.

[0096] Furthermore, the network equipment based on the serving cell instructs the terminal equipment to switch to the target cell, and the terminal equipment can perform uplink synchronization according to the TA information of the target cell.

[0097] It should be noted that the TA information may include a TA value or a TA group, wherein the TA value in each TA group is the same.

[0098] In summary, by sending an uplink reference signal to the network equipment of at least one candidate cell; wherein the TA indication information sent by the network equipment of the serving cell at least includes: the TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch; receiving the TA indication information sent by the network equipment of the serving cell where the terminal equipment is located; wherein the TA indication information sent by the network equipment of the serving cell at least includes: the TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch; the network equipment based on the serving cell instructs the terminal equipment to switch to the target cell, and performs uplink synchronization according to the TA information of the target cell. Thus, before the terminal equipment performs cell switching, the terminal equipment sends the uplink reference signal pre-configured by the network equipment of the serving cell where it is located, so that the network equipment of at least one candidate cell determines the TA information according to the uplink reference signal, and obtains the TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch from the TA indication information sent by the network equipment of the serving cell where the terminal equipment is located. This enables the terminal equipment to perform uplink synchronization in a timely manner according to the pre-acquired TA information after cell switching.

[0099] To clearly illustrate how to receive TA indication information sent by a network device in a serving cell where a terminal device is located, as an example, an embodiment of the present disclosure proposes another uplink synchronization method. It should be noted that the uplink synchronization method in the embodiment of the present disclosure is executed by the terminal device.

[0100] FIG5 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0101] As shown in FIG5 , the uplink synchronization method may include steps 501 to 504:

[0102] Step 501: Send an uplink reference signal to a network device of at least one candidate cell.

[0103] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0104] Step 502: Receive a first switching instruction sent by a network device of a serving cell where the terminal device is located.

[0105] The first switching instruction is used to instruct the terminal device to switch to a target cell among at least one candidate cell.

[0106] In an embodiment of the present disclosure, the network device of the service cell where the terminal device is located may send a first switching instruction to the terminal device. After receiving the first switching instruction, the terminal device may switch to a target cell in at least one candidate cell according to the first switching instruction.

[0107] Step 503: The first handover instruction carries TA indication information, where the TA indication information includes cell indication information of the target cell and TA information of the target cell.

[0108] The cell indication information may include at least one of the following: a cell identity document (ID); or a cell-associated transmission configuration indicator (TCI) status; or a cell-associated control resource pool set index and a cell-associated uplink channel; or a cell index.

[0109] In the embodiment of the present disclosure, the first handover instruction may carry TA indication information, where the TA indication information includes cell indication information of the target cell and TA information of the target cell.

[0110] For example, as shown in Figure 6, in the first column of Figure 6, when the target cell is cell 1, the TA indication information includes the cell indication information of cell 1 (Indicator#1) and the TA information of cell 1 (TA1#1); as shown in the second column of Figure 6, when the target cell is cell 2, the TA indication information includes the cell indication information of cell 2 (Indicator#2) and the TA information of cell 2 (TA1#2); and so on, as shown in the Mth column of Figure 6, when the target cell is cell M, the TA indication information includes the cell indication information of cell M (Indicator#M) and the TA information of cell M (TA1#M).

[0111] Step 504: The network device based on the serving cell instructs the terminal device to switch to the target cell and perform uplink synchronization according to the TA information of the target cell.

[0112] Among them, step 501 can be implemented in any way in each embodiment of the present disclosure. The embodiments of the present disclosure do not limit this and will not be described in detail.

[0113] In summary, by receiving the first switching instruction sent by the network equipment of the service cell where the terminal equipment is located; wherein the first switching instruction is used to instruct the terminal equipment to switch to the target cell in at least one candidate cell, the first switching instruction carries TA indication information, and the TA indication information includes the cell indication information of the target cell, and the TA information of the target cell. Therefore, by carrying the TA indication information in the first switching instruction sent by the network equipment of the service cell where the terminal equipment is located to the terminal equipment, the terminal equipment can obtain the TA indication information sent by the network equipment of the service cell where the terminal equipment is located when receiving the first switching instruction, and then, the TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch can be obtained through the TA indication information.

[0114] It should be noted that the above-mentioned possible implementation methods can be executed separately or in combination, and the embodiments of the present disclosure are not limited to this.

[0115] To clearly illustrate how to receive TA indication information sent by a network device in a serving cell where a terminal device is located, as an example, an embodiment of the present disclosure proposes another uplink synchronization method. It should be noted that the uplink synchronization method in the embodiment of the present disclosure is executed by the terminal device.

[0116] FIG7 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0117] As shown in FIG7 , the uplink synchronization method may include steps 701 to 703:

[0118] Step 701: Send an uplink reference signal to a network device of at least one candidate cell.

[0119] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0120] Step 702: Receive a random access message sent by a network device in the serving cell where the terminal device is located.

[0121] The random access message is sent by the network equipment of at least one candidate cell to the network equipment of the serving cell, and carries TA indication information; the TA indication information includes cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0122] As an example, the network device of at least one candidate cell sends random access information to the network device of the serving cell. The random access message may be high-layer signaling or L1 (layer 1) DCI, wherein the random access information carries TA indication information. The TA indication information may include cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0123] Among them, the cell indication information may include at least one of the following: cell identification ID; or, cell-associated TCI status; or, cell-associated control resource pool set index; or, cell-associated uplink channel; or, cell index; TA information may include TA value or TA group.

[0124] In addition, it should be noted that the random access message can be carried in the switching command in which the network equipment of the serving cell instructs the terminal device to switch to the target cell, or it can be periodically sent to the terminal device by the network equipment of the serving cell through special signaling, or it can be carried in the RAR MAC PDU, where the network equipment of the serving cell can configure whether to send the MAC PDU to the terminal device.

[0125] Step 703: The network device based on the serving cell instructs the terminal device to switch to the target cell and performs uplink synchronization according to the TA information of the target cell.

[0126] Furthermore, the network device of the serving cell where the terminal device is located may indicate a target cell in at least one candidate cell to which the terminal device is to be switched. The terminal device may switch to the target cell and perform uplink synchronization based on the TA information of the target cell. Step 701 may be implemented using any of the methods in the various embodiments of the present disclosure, which is not limited in the present disclosure and will not be further described.

[0127] In summary, by receiving a random access message sent by a network device of a service cell where the terminal device is located, wherein the random access information is from a network device of at least one candidate cell to a network device of a service cell, carrying TA indication information, and the TA indication information may include cell indication information of at least one candidate cell and TA information of at least one candidate cell, the terminal device can determine the TA information of the target cell by receiving the random access message sent by the network device of the service cell, thereby performing uplink synchronization according to the TA information of the target cell.

[0128] To clearly illustrate how to receive TA indication information sent by a network device in a serving cell where a terminal device is located, as another example, an embodiment of the present disclosure proposes another uplink synchronization method. It should be noted that the uplink synchronization method in the embodiment of the present disclosure is executed by the terminal device.

[0129] FIG8 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0130] As shown in FIG8 , the uplink synchronization method may include steps 801-804:

[0131] Step 801: Send an uplink reference signal to a network device of at least one candidate cell.

[0132] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0133] Step 802: Receive a first indication message sent by a network device of a service cell where the terminal device is located.

[0134] Among them, the first indication message is used to instruct the terminal device to store or update the TA information of at least one candidate cell.

[0135] In an embodiment of the present disclosure, after receiving TA information sent by the network device of at least one candidate cell, the network device of the service cell where the terminal device is located may send first indication information to the terminal device. After receiving the first indication information, the terminal device may store or update the TA information of at least one candidate cell.

[0136] Step 803: The first indication message carries TA indication information, where the TA indication information includes cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0137] In addition, the first indication information sent by the network device of the service cell where the terminal device is located to the terminal device carries TA indication information, wherein the TA indication information may include the TA information of the target cell in at least one candidate cell to which the terminal device is to switch, as well as the TA information and cell indication information of other candidate cells except the target cell.

[0138] It should be noted that the first indication message may be a MAC layer control information (MAC Control Element, MAC-CE for short) message, or a downlink control information (Downlink Control Information, DCI for short) message.

[0139] It should also be noted that after the terminal device receives the first indication message sent by the network device of the service cell where the terminal device is located, the network device of the service cell where the terminal device is located may send a second switching instruction to the terminal device to instruct the terminal device to switch to the target cell, wherein the second switching instruction may also carry the cell indication information of the target cell.

[0140] Step 804: The network device based on the serving cell instructs the terminal device to switch to the target cell and perform uplink synchronization according to the TA information of the target cell.

[0141] Among them, step 801 and step 804 can be implemented in any way in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0142] In summary, by receiving the first indication message sent by the network device of the service cell where the terminal device is located; the first indication message carries TA indication information, and the TA indication information includes the cell indication information of at least one candidate cell, and the TA information of at least one candidate cell. Therefore, by carrying the TA indication information in the first indication message sent by the network device of the service cell where the terminal device is located to the terminal device, the terminal device can obtain the TA indication information sent by the network device of the service cell where the terminal device is located when receiving the first indication message, and obtain the TA information of the target cell in at least one candidate cell to which the terminal device is to switch through the TA indication information.

[0143] It should be noted that the above-mentioned possible implementation methods can be executed separately or in combination, and the embodiments of the present disclosure are not limited to this.

[0144] To clearly illustrate how the above embodiment receives the first indication message sent by the network device of the serving cell, as an example, the embodiment of the present disclosure proposes another uplink synchronization method. It should be noted that the uplink synchronization method of the embodiment of the present disclosure is executed by the terminal device.

[0145] FIG9 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0146] As shown in FIG9 , the uplink synchronization method may include steps 901 to 905:

[0147] Step 901: Send an uplink reference signal to a network device of at least one candidate cell.

[0148] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0149] Step 902: Receive a first indication message periodically sent by a network device of a serving cell.

[0150] The periodically sent first indication message is generated according to TA information periodically determined by a network device of at least one candidate cell.

[0151] As a possible implementation method of an embodiment of the present disclosure, the network equipment of at least one candidate cell may periodically determine the TA information of at least one candidate cell, so that the network equipment of at least one candidate cell may periodically send the TA information of at least one candidate cell to the network equipment of the service cell where the terminal device is located, and the network equipment of the service cell where the terminal device is located periodically sends a first indication message to the terminal device.

[0152] Step 903: periodically update the TA information of at least one candidate cell according to the periodically received first indication message.

[0153] Furthermore, after the terminal device periodically receives the first indication message sent by the network device of the service cell where the terminal device is located, the terminal device can periodically update the TA information of at least one candidate cell according to the periodically received first indication message.

[0154] Step 904: The first indication message carries TA indication information, where the TA indication information includes cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0155] Step 905: The network device based on the serving cell instructs the terminal device to switch to the target cell and performs uplink synchronization according to the TA information of the target cell.

[0156] Among them, step 901, step 904 to step 905 can be implemented in any way in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0157] In summary, by receiving the first indication message periodically sent by the network device of the service cell, the TA information of at least one candidate cell is periodically updated according to the periodically received first indication message. Thus, the terminal device can periodically update the TA information of at least one candidate cell, and the terminal device can perform uplink synchronization according to the TA information of the target cell in at least one candidate cell after periodic update, thereby improving the accuracy of uplink synchronization.

[0158] It should be noted that the above-mentioned possible implementation methods can be executed separately or in combination, and the embodiments of the present disclosure are not limited to this.

[0159] In order to implement the above embodiment, the embodiment of the present disclosure further proposes another uplink synchronization method. It should be noted that the uplink synchronization method of the embodiment of the present disclosure is executed by a terminal device.

[0160] FIG10 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0161] As shown in FIG10 , the uplink synchronization method may include steps 1001 to 1007:

[0162] Step 1001: Receive a second indication message sent by a network device of a serving cell.

[0163] The second indication message is used to indicate multiple neighboring cells of the serving cell.

[0164] In an embodiment of the present disclosure, the network device of the service cell where the terminal device is located may send a second indication message to the terminal device. After receiving the second indication message, the terminal device may obtain multiple neighboring cells of the service cell where the terminal device is located.

[0165] Step 1002: According to the second indication message, measure multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells.

[0166] As an example, after the terminal device obtains multiple neighboring cells of the service cell where the terminal device is located according to the second indication message, it can perform beam measurement on the multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells, wherein the measurement result parameters may include at least one of the following: reference signal received power (Reference Signal Received Power, referred to as RSRP), received signal strength indication (Received Signal Strength Indicator, referred to as RSSI), reference signal received quality (Reference Signal Received Quality, referred to as RSRQ) and signal to interference and noise ratio (Signal to Interference Noise Ratio, referred to as RS-SINR).

[0167] Step 1003: Send measurement result parameters of multiple neighboring cells to the network equipment of the serving cell.

[0168] The measurement result parameters are used by the network equipment of the serving cell to determine at least one candidate cell from a plurality of neighboring cells.

[0169] As an example, the terminal device sends measurement result parameters of multiple neighboring cells to the network device of its own serving cell, and the network device of the serving cell where the terminal device is located can determine at least one candidate cell from the multiple neighboring cells based on the measurement result parameters.

[0170] Among them, at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to the set offset, wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0171] For example, the measurement result parameter sent by the terminal device to the network device of its service cell is RSRQ, and the measurement result parameter is set to the set RSRQ. The RSRQ of each candidate cell in at least one candidate cell is higher than the set RSRQ, and the difference between the RSRQ of each candidate cell and the set RSRQ is greater than or equal to the set offset.

[0172] Step 1004: Receive a third indication message sent by the network equipment of the serving cell.

[0173] The third indication message is used to instruct the terminal device to send an uplink reference signal to the network device of at least one candidate cell.

[0174] In an embodiment of the present disclosure, the network device of the service cell where the terminal device is located sends a third indication message to the terminal device. After the terminal device receives the third indication message sent by the network device of its own service cell, it can send an uplink reference signal to the network device of at least one candidate cell.

[0175] As an example, the third indication information may be high-layer signaling, MAC CE or L1 (layer 1) DCI, wherein, when the third indication information is L1DCI, the index of at least one candidate cell may be included in the PDCCH command DCI format 1_0 to instruct the terminal device to send an uplink reference signal to the candidate cell with the corresponding index; when the third indication information is MAC CE, the PDSCH (Physical Downlink Shared Channel) carrying the MAC CE is scheduled through the PDCCH (Physical Downlink Control Channel), and the CRC (Cyclic Redundancy Check) of the PDCCH is scrambled by the C-RNTI (Cell-Radio Network Temporary Identifier).

[0176] Among them, the third indication message carries the time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries the power control parameter information of the uplink reference signal; and / or, the third indication message carries the configuration information of the transmission beam of the uplink reference signal.

[0177] As a possible implementation form of the embodiment of the present disclosure, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of times the uplink reference signal is sent is an initial transmission or a retransmission.

[0178] As another possible implementation form of the embodiment of the present disclosure, the power control parameter information includes power increase information.

[0179] Step 1005: Send an uplink reference signal to a network device of at least one candidate cell.

[0180] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0181] As an example, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of times the uplink reference signal is sent is the initial transmission. Based on the power control parameter information being the initial transmission, the uplink reference signal is sent to the network device of at least one candidate cell at the set power corresponding to the initial transmission.

[0182] As another example, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of times the uplink reference signal is sent is retransmission. Based on the power control parameter information being retransmission, the uplink reference signal is sent to the network device of at least one candidate cell according to the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information.

[0183] For example, the power control parameter information includes adding a power ramping indication in the PDCCH command, which can be 1 bit or N bits (N>1). When the power ramping indication is 1 bit, it indicates whether the PRACH (Physical Random Access Channel) transmission triggered by the PDCCH command is an initial transmission or a retransmission. For example, "0" indicates that the PRACH transmission triggered by the PDCCH command is an initial transmission (initial transmission), and "1" indicates that the PRACH transmission triggered by the PDCCH command is a retransmission. The terminal device determines the transmission power of the next PRACH transmission based on the previous transmission power according to the instruction of the network device until the maximum transmission power allowed by the terminal is reached.

[0184] As another example, the power control parameter information includes power increase information, and an uplink reference signal is sent to a network device of at least one candidate cell according to the previous uplink reference signal transmission power and the transmission power determined by the power increase information.

[0185] For example, the power control parameter information includes adding a power ramp (power increase) indication in the PDCCH command, which is N bits. This can directly indicate the power increase information (transmission power ramp) of the PRACH triggered by the PDCCH command. For example, {00, 01, 10, 11} are used to represent power increase information of 2dB, 4dB, 6dB, and 8dB, respectively. The terminal device, in accordance with the instructions of the network device, adds the indicated power increase information to the power of the previously sent PRACH transmission as the power of the next PRACH transmission.

[0186] Step 1006: Receive TA indication information sent by the network equipment of the service cell where the terminal equipment is located.

[0187] The TA indication information sent by the network equipment of the serving cell includes at least: TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch.

[0188] Step 1007: The network device based on the serving cell instructs the terminal device to switch to the target cell and performs uplink synchronization according to the TA information of the target cell.

[0189] Among them, steps 1005 to 1007 can be implemented in any way in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0190] In summary, by receiving the second indication message sent by the network equipment of the service cell; measuring multiple adjacent cells according to the second indication message to obtain measurement result parameters of multiple adjacent cells; sending the measurement result parameters of multiple adjacent cells to the network equipment of the service cell, and receiving the third indication message sent by the network equipment of the service cell, the network equipment of the service cell where the terminal device is located can determine at least one candidate cell based on the measurement result parameters of the multiple adjacent cells measured by the terminal device, and instruct the terminal device to send an uplink reference signal to at least one candidate cell according to the third indication message.

[0191] It should be noted that the above-mentioned possible implementation methods can be executed separately or in combination, and the embodiments of the present disclosure are not limited to this.

[0192] In order to implement the above embodiment, the embodiment of the present disclosure further proposes another uplink synchronization method. It should be noted that the uplink synchronization method of the embodiment of the present disclosure is executed by a terminal device.

[0193] FIG11 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0194] As shown in FIG11 , the uplink synchronization method may include steps 1101 to 1106:

[0195] Step 1101: Receive a second indication message sent by a network device of a serving cell.

[0196] The second indication message is used to indicate multiple neighboring cells of the serving cell.

[0197] In an embodiment of the present disclosure, the network device of the service cell where the terminal device is located may send a second indication message to the terminal device. After receiving the second indication message, the terminal device may obtain multiple neighboring cells of the service cell where the terminal device is located.

[0198] Step 1102: According to the second indication message, measure multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells.

[0199] As an example, after the terminal device obtains multiple neighboring cells of the service cell where the terminal device is located according to the second indication message, it can perform beam measurement on the multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells, where the measurement result parameters may include at least one of the following: RSRP, RSSI, RSRQ and RS-SINR.

[0200] Step 1103: Determine at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0201] Furthermore, the terminal device determines at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0202] Among them, at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to the set offset, wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0203] For example, the measurement result parameter of the service cell where the terminal device is located is RSRQ, the measurement result parameter is set to the set RSRQ, the RSRQ of each candidate cell in at least one candidate cell is higher than the set RSRQ, and the difference between the RSRQ of each candidate cell and the set RSRQ is greater than or equal to the set offset.

[0204] Step 1104: Send an uplink reference signal to a network device of at least one candidate cell.

[0205] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0206] Step 1105: Receive TA indication information sent by the network equipment of the service cell where the terminal equipment is located.

[0207] The TA indication information sent by the network equipment of the serving cell includes at least: TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch.

[0208] Step 1106: The network device based on the serving cell instructs the terminal device to switch to the target cell and perform uplink synchronization according to the TA information of the target cell.

[0209] Among them, steps 1104 to 1106 can be implemented in any way in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be described in detail.

[0210] In summary, by receiving a second indication message sent by a network device of a serving cell; measuring multiple adjacent cells according to the second indication message to obtain measurement result parameters of multiple adjacent cells; and determining at least one candidate cell from the multiple adjacent cells according to the measurement result parameters of the multiple adjacent cells, the terminal device can determine at least one candidate cell from the multiple adjacent cells according to the measurement result parameters of the multiple adjacent cells.

[0211] It should be noted that the above-mentioned possible implementation methods can be executed separately or in combination, and the embodiments of the present disclosure are not limited to this.

[0212] In order to clearly illustrate how the above embodiment performs uplink synchronization based on the TA information of the target cell, another uplink synchronization method is proposed in the embodiment of the present disclosure. It should be noted that the uplink synchronization method in the embodiment of the present disclosure is executed by the terminal device.

[0213] FIG12 is a flow chart of another uplink synchronization method provided by an embodiment of the present disclosure.

[0214] As shown in FIG12 , the uplink synchronization method may include steps 1201 to 1203:

[0215] Step 1201: Send an uplink reference signal to a network device of at least one candidate cell.

[0216] The uplink reference signal is configured by the network equipment of the serving cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information.

[0217] Step 1202: Receive TA indication information sent by the network equipment of the service cell where the terminal equipment is located.

[0218] The TA indication information sent by the network equipment of the serving cell includes at least: TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch.

[0219] Step 1203 , in response to the network equipment of the serving cell instructing the terminal equipment to switch to the target cell, based on the downlink reference timing of the terminal equipment, the transmission time of the physical layer uplink shared channel PUSCH transmission is adjusted using the TA information of the target cell.

[0220] In an embodiment of the present disclosure, the terminal device calculates an absolute time adjustment amount according to the TA information of the target cell, and adjusts the transmission time of the physical uplink shared channel (PUSCH) transmission based on the downlink reference timing of the terminal device.

[0221] Among them, step 1201 to step 1202 can be implemented in any way in the embodiments of the present disclosure, and the embodiments of the present disclosure do not limit this and will not be repeated.

[0222] In summary, based on the downlink reference timing of the terminal device, the TA information of the target cell is used to adjust the transmission time of the physical layer uplink shared channel PUSCH transmission. As a result, the terminal device can perform uplink synchronization in time according to the pre-acquired TA information of the target cell.

[0223] It should be noted that the above-mentioned possible implementation methods can be executed separately or in combination, and the embodiments of the present disclosure are not limited to this.

[0224] In order to clearly illustrate the above embodiment, an example is now given for illustration.

[0225] For example, taking the uplink reference signal as the preamble signal, the process of the uplink synchronization method of the embodiment of the present disclosure may include the following steps 1 to 9:

[0226] Step 1: The network device (base station) of the serving cell where the terminal device is located configures the signal state information-report configuration (CSI-ReportConfig) and the signal state information-resource configuration (CSI-ResourceConfig) through RRC, instructing the terminal device to perform beam measurement on the cells in the cell list {PCI1, PCI2, PCI3, ..., PCI7} contained in the CSI-ResourceConfig, and at the same time instructing the terminal device to periodically report the beam measurement results (SSBRI+L1-RSRP+PCI). Among them, the resources for beam measurement are the resource set {SSB1, SSB2, SSB3, SSB4, ..., SSB7};

[0227] Step 2: The terminal device performs multiple neighboring cell measurements according to the configuration of the network equipment of its own serving cell, and reports the multiple neighboring cell measurement results to the network equipment of its own serving cell according to the configuration of the network equipment of its own serving cell: L1-RSRP1+SSB1+PCI1,...,L1-RSRP2+SSB2+PCI2,L1-RSRP7+SSB7+PCI7;

[0228] Step 3: The network device of the serving cell where the terminal device is located sorts the measurement results reported by the terminal device and determines that the four candidate cells are PCI1, PCI3, PCI5, and PCI7;

[0229] Step 4: The network device of the serving cell where the terminal device is located notifies the terminal device through RRC configuration to send a preamble signal to the candidate cell;

[0230] Step 5: The terminal device sends corresponding preamble 1, preamble 3, preamble 5, and preamble 7 to candidate cells PCI1, PCI3, PCI5, and PCI7 using the receive SSB beam in the corresponding PRACH scenario according to the instructions of the network device of its serving cell.

[0231] Step 6: The candidate cell receives the pilot signal sent by the terminal device and estimates the corresponding TA values ​​TA1, TA3, TA5, and TA7 using the corresponding uplink reference signal, and sends the estimation results to the network device of the serving cell where the terminal device is located;

[0232] In step 7, the network device of the serving cell where the terminal device is located receives the TA values ​​of all candidate cells, notifies the terminal device of all candidate cells and corresponding TA values ​​through a MAC-CE message (or DCI message), and carries TA indication information in the handover command. The MAC-CE message carrying the indication information of the candidate cells and the corresponding TA information may be shown in FIG13 , wherein the correspondence between the indication information 001, 011, 101, 111 of the cells in FIG13 and the physical cell identifier (PCI) is implemented by the system in a predefined manner. The correspondence between the indication information of a cell and the PCI is shown in FIG14 ;

[0233] Among them, it should be noted that if a DCI message is used, a field indicating a TA message can be added to the DCI, and the corresponding TA message can be indicated by associating the Transmission Configuration Index (TCI) field in the DCI. The DCI here includes DCI for beam indication (DCI format 1-1 or DCI format 1-2), as well as DCI for scheduling PUSCH (DCI format 0-0 or DCI format 0-1) and DCI for scheduling PUCCH (DCI format 1-0 or DCI format 1-1); in the nth time slot, the network device of the service cell where the terminal device is located sends DCI format 1-1 for beam indication, which includes TCI state 1 and TA information, instructing the terminal to use the receiving beam of the reference signal contained in TCI state 1 to send the subsequently scheduled PUSCH, and use the contained TA information to adjust the subsequently scheduled PUSCH transmission. Alternatively, the corresponding TA information is included in DCI format 0-0 or DCI format 0-1, instructing the terminal to adjust the PUSCH on the scheduled resources using the TA information included in DCI format 0-0 or DCI format 0-1;

[0234] Step 8: The terminal device receives a handover command from the network device of its serving cell, which instructs the terminal device to switch from the current cell to a cell with a PCI of 7. The handover command includes the TA7 corresponding to the target cell determined in step 7. The terminal device receives the TA7 information indicated by the network device of its serving cell and calculates the time adjustment N for the uplink transmission of the target cell (PCI7). TA_new , N TA_new =N TA_old +(TA-31)*16*64 / 2 u , where TA = 0, 1, 2, 3…, 63, u is a parameter describing the subcarrier spacing, u = 0, 1, 2 represent 15 khz, 30 khz, 60 khz subcarrier spacing respectively;

[0235] For example, N TA_new =10+(32-31)*16*64 / 2 2 =266(T c );

[0236] Among them, N TA_old =10,TA7=32,T c =1 / (4096*480000)=0.509ns, the terminal device calculates the absolute time adjustment T TA_new =(TA offset +N TA_new )T c =(25600+266)T c=13.17 (us), and the uplink channel or uplink signal is sent 13.17 us in advance based on the downlink reception time point;

[0237] In step 9, the terminal device sends a hybrid automatic repeat request (HARQ) or confirmation (ACK) message to the network device of its service cell, indicating that it has successfully accessed PCI7. The network device of the service cell where the terminal device is located then notifies PCI7 through the relevant interface (e.g., X2) that the terminal device has successfully accessed.

[0238] For another example, taking the uplink reference signal as a sounding reference signal, the process of the uplink synchronization method of the embodiment of the present disclosure may include the following steps 1 to 9:

[0239] Step 1: The network device (base station) of the serving cell where the terminal device is located configures the signal state information-report configuration (CSI-ReportConfig) and the signal state information-resource configuration (CSI-ResourceConfig) through RRC, instructing the terminal device to perform beam measurement on the cells in the cell list {PCI1, PCI2, PCI3, ..., PCI7} contained in the CSI-ResourceConfig, and at the same time instructing the terminal device to periodically report the beam measurement results (SSBRI+L1-RSRP+PCI). Among them, the resources for beam measurement are the resource set {SSB1, SSB2, SSB3, SSB4, ..., SSB7};

[0240] Step 2: The terminal device performs multiple neighboring cell measurements according to the configuration of the network equipment of its own serving cell, and reports the multiple neighboring cell measurement results to the network equipment of its own serving cell according to the configuration of the network equipment of its own serving cell: L1-RSRP1+SSB1+PCI1,...,L1-RSRP2+SSB2+PCI2,L1-RSRP7+SSB7+PCI7;

[0241] Step 3: The network device of the serving cell where the terminal device is located sorts the measurement results reported by the terminal device and determines that the four candidate cells are PCI1, PCI3, PCI5, and PCI7;

[0242] Step 4: The network device of the serving cell where the terminal device is located notifies the terminal device of the SRS resource identifier and the corresponding time and frequency resources to be periodically sent to the candidate cell through RRC configuration (e.g., sounding reference signal-resource);

[0243] Step 5: The terminal device sends corresponding srs-resource1, srs-resource3, srs-resource5, and srs-resource7 to the candidate cells PCI1, PCI3, PCI5, and PCI7 on the corresponding time and frequency resources according to the instructions of the network device of the serving cell where the terminal device is located;

[0244] Step 6: The candidate cell receives the SRS resource sent by the terminal and uses the corresponding uplink reference signal to estimate the corresponding TA values ​​TA1, TA3, TA5, and TA7. The estimation result is sent to the terminal's current serving cell.

[0245] In step 7, the network device of the serving cell where the terminal device is located receives the TA information of all candidate cells, notifies the terminal device of all candidate cells and corresponding TA information through a MAC-CE message (or DCI message), and carries TA indication information in the handover command. The MAC-CE message carrying the indication information of the candidate cells and the corresponding TA information may be shown in FIG13 , wherein the correspondence between the indication information 001, 011, 101, 111 of the cells in FIG13 and the physical cell identifier (PCI) is implemented by the system in a predefined manner. The correspondence between the indication information of a cell and the PCI is shown in FIG14 ;

[0246] Step 8: The terminal device receives a handover command from the network device of its serving cell, which instructs the terminal device to switch from the current cell to the cell with PCI 7. The terminal device uses the previously stored TA7 information to calculate the time adjustment N for the uplink transmission of the target cell (PCI 7). TA_new , N TA_new =N TA_old +(TA-31)*16*64 / 2 u , where TA = 0, 1, 2, 3…, 63, u is a parameter describing the subcarrier spacing, u = 0, 1, 2 represent 15 khz, 30 khz, 60 khz subcarrier spacing respectively;

[0247] For example, N TA_new =10+(32-31)*16*64 / 2 2 =266(T c );

[0248] Among them, N TA_old =10,TA7=32,T c =1 / (4096*480000)=0.509ns, the terminal device calculates the absolute time adjustment T TA_new =(TA offset +NTA_new )T c =(25600+266)T c =13.17 (us), and the uplink channel or uplink signal is sent 13.17 us in advance based on the downlink reception time point;

[0249] Step 9: The terminal device sends HARQ or ACK information to the network device of its serving cell indicating that it has successfully accessed PCI7. The network device of the serving cell where the terminal device is located then notifies PCI7 through the relevant interface (eg, X2) that the terminal device has successfully accessed.

[0250] It should be noted that the network device sends a PDCCH command (DCI format 1_0), which may include a candidate cell index (01) to instruct the terminal device to send a PRACH transmission to the candidate cell 13. The correspondence between the candidate cell index and the candidate cell index indication is configured to the terminal device through RRC. At the same time, the PDCCH command includes a transmission power ramp indication field. As an example, when the transmission power ramp indication field is 1 bit, for example, the indicated value is "1", indicating that the PRACH transmission triggered by the terminal this time is a retransmission. According to the instruction of the network device, the terminal device adds a power increase value of 2dB to the power of the last PRACH transmission as the power of the next PRACH transmission. The power increase value is configured to the terminal device through RRC, and the terminal device sends a PRACH transmission to the candidate cell 13 according to the calculated transmission power. The beam for the terminal device to send the PRACH transmission may be the receiving beam of the synchronization broadcast block (Synchronization Signal / PBCH, abbreviated as SSB) index indicated in the PDCCH command.

[0251] As another example, when the transmission power ramp indication field is N bits, the PDCCH command may indicate the absolute value of the transmission power increase (transmission power ramp), for example, 3 bits, where "000" indicates a power increase of 0 dB, "010" indicates a transmission power increase of 2 dB, "100" indicates a transmission power increase of 4 dB, and "110" indicates a transmission power increase of 6 dB. The terminal device, in accordance with the instructions of the network device, adds the power increase indication value, for example, 6 dB (110), to the previous transmission power as the transmission power for the next PRACH transmission.

[0252] The uplink synchronization method of the embodiment of the present disclosure is executed by a terminal device by sending an uplink reference signal to the network equipment of at least one candidate cell, wherein the uplink reference signal is configured by the network equipment of the service cell where the terminal device is located, and is used by the network equipment of the at least one candidate cell to determine the timing advance TA information; receiving TA indication information sent by the network equipment of the service cell where the terminal device is located; wherein the TA indication information sent by the network equipment of the service cell at least includes: TA information of the target cell in at least one candidate cell to which the terminal device is to switch; the network equipment based on the service cell instructs the terminal device to switch to the target cell, and performs uplink synchronization according to the TA information of the target cell, thereby, before the terminal device performs cell switching, the terminal device sends the uplink reference signal pre-configured by the network equipment of the service cell where it is located, so that the network equipment of at least one candidate cell determines the TA information according to the uplink reference signal, and obtains the TA information of the target cell in at least one candidate cell to which the terminal device is to switch from the TA indication information sent by the network equipment of the service cell where the terminal device is located, so that the terminal device can perform uplink synchronization in a timely manner according to the pre-acquired TA information after the cell switching.

[0253] The above-mentioned uplink synchronization methods are executed by the terminal device. The embodiment of the present disclosure also proposes an uplink synchronization method executed by the network equipment of the service cell where the terminal device is located.

[0254] FIG15 is a flow chart of another uplink synchronization method provided in an embodiment of the present disclosure.

[0255] As shown in FIG15 , the uplink synchronization method is executed by a network device in a serving cell where the terminal device is located, and may include steps 1501-1502:

[0256] Step 1501: Receive timing advance (TA) information sent by a network device of at least one candidate cell.

[0257] The TA information of at least one candidate cell is determined based on the uplink reference signal sent by the terminal device.

[0258] In an embodiment of the present disclosure, a terminal device may send an uplink reference signal pre-configured by a network device of a serving cell where the terminal device is located to a network device of at least one candidate cell. The network device of at least one candidate cell may determine TA information based on the uplink reference signal, and the network device of at least one candidate cell may send the TA information to the network device of the serving cell where the terminal device is located.

[0259] It should be noted that the uplink reference signal may include at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0260] Step 1502: Send TA indication information to the terminal device based on the TA information of at least one candidate cell.

[0261] Among them, the TA indication information sent to the terminal device includes at least: the TA information of the target cell in at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used by the terminal device to instruct the terminal device to switch to the target cell based on the network device of the serving cell for uplink synchronization.

[0262] In an embodiment of the present disclosure, the network device of the service cell where the terminal device is located sends TA indication information to the terminal device, and the TA indication information sent to the terminal device includes at least: TA information of the target cell in at least one candidate cell to which the terminal device is to switch.

[0263] As an example, the TA indication information sent by the network device of the serving cell includes TA information of the target cell in at least one candidate cell to which the terminal device is to switch.

[0264] As another example, the TA indication information sent by the network device of the serving cell may include the TA information of the target cell in at least one candidate cell to which the terminal device is to switch, and may also include the TA information of other candidate cells except the target cell.

[0265] Furthermore, the network equipment based on the serving cell instructs the terminal equipment to switch to the target cell, and the terminal equipment can perform uplink synchronization according to the TA information of the target cell.

[0266] In summary, by receiving the timing advance TA information sent by the network equipment of at least one candidate cell; wherein the TA information of at least one candidate cell is determined according to the uplink reference signal sent by the terminal equipment, and according to the TA information of at least one candidate cell, sending TA indication information to the terminal equipment, wherein the TA indication information sent to the terminal equipment at least includes: the TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch; the TA information of the target cell is used for the terminal equipment to instruct the terminal equipment to switch to the target cell based on the network equipment of the serving cell for uplink synchronization. Therefore, before the terminal equipment performs cell switching, the terminal equipment obtains the TA information of the target cell in at least one candidate cell to which the terminal equipment is to switch according to the TA indication information sent by the network equipment of the serving cell where the terminal equipment is located, so that the terminal equipment can perform uplink synchronization in a timely manner according to the pre-acquired TA information after the cell switching.

[0267] In a possible implementation of an embodiment of the present disclosure, TA indication information is sent to a terminal device based on the TA information of at least one candidate cell, including: sending a first switching instruction to the terminal device based on the TA information of the target cell in the at least one candidate cell; wherein the first switching instruction is used to instruct the terminal device to switch to the target cell in the at least one candidate cell; the first switching instruction carries TA indication information, and the TA indication information includes cell indication information of the target cell and TA information of the target cell.

[0268] In a possible implementation of an embodiment of the present disclosure, TA indication information is sent to the terminal device based on the TA information of at least one candidate cell, including: sending a first indication message to the terminal device based on the TA information of the at least one candidate cell; wherein the first indication message is used to instruct the terminal device to store or update the TA information of at least one candidate cell; the first indication message carries TA indication information, and the TA indication information includes cell indication information of at least one candidate cell, and TA information of at least one candidate cell.

[0269] In a possible implementation of an embodiment of the present disclosure, TA indication information is sent to a terminal device based on the TA information of at least one candidate cell, including: sending a random access message to the terminal device, wherein the random access message is sent by the network device of at least one candidate cell to the network device of the server cell, carrying the TA indication information; the TA indication information includes the cell indication information of at least one candidate cell, and the TA information of at least one candidate cell.

[0270] In a possible implementation of an embodiment of the present disclosure, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel; or a cell index.

[0271] In a possible implementation manner of the embodiment of the present disclosure, the TA information includes a TA value or a TA group.

[0272] In a possible implementation manner of the embodiment of the present disclosure, the first indication message is a MAC-CE message, or a DCI message.

[0273] In a possible implementation of an embodiment of the present disclosure, after sending a first indication message to a terminal device based on the TA information of at least one candidate cell, it also includes: sending a second switching instruction to the terminal device; wherein the second switching instruction is used to instruct the terminal device to switch to the target cell; the second switching instruction carries the cell indication information of the target cell.

[0274] In a possible implementation of an embodiment of the present disclosure, a first indication message is sent to a terminal device based on the TA information of at least one candidate cell, including: periodically sending the first indication message to the terminal device based on the TA information periodically determined by the network device of at least one candidate cell.

[0275] In a possible implementation of an embodiment of the present disclosure, the uplink synchronization method includes: sending a second indication message to a terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple adjacent cells of the service cell to obtain measurement result parameters of the multiple adjacent cells; receiving the measurement result parameters of the multiple adjacent cells sent by the terminal device; determining at least one candidate cell from the multiple adjacent cells based on the measurement result parameters; and sending a third indication message to the terminal device, wherein the third indication message is used to instruct the terminal device to send an uplink reference signal to a network device of at least one candidate cell.

[0276] In a possible implementation of an embodiment of the present disclosure, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0277] In a possible implementation of the embodiment of the present disclosure, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; based on the power control parameter information being the initial transmission, it is used to indicate that the uplink reference signal is sent to the network device of at least one candidate cell at the set power corresponding to the initial transmission; based on the power control parameter being the retransmission, it is used to indicate that the uplink reference signal is sent to the network device of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information.

[0278] In a possible implementation of an embodiment of the present disclosure, the power control parameter information includes power increase information; the power increase information is used to send an uplink reference signal to a network device of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the power increase information.

[0279] In a possible implementation of an embodiment of the present disclosure, the uplink synchronization method further includes: sending a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple adjacent cells of the serving cell to obtain measurement result parameters of the multiple adjacent cells, and determine at least one candidate cell from the multiple adjacent cells based on the measurement result parameters of the multiple adjacent cells.

[0280] In a possible implementation of an embodiment of the present disclosure, at least one candidate cell is a cell whose measurement result parameter is higher than a set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to a set offset, wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0281] The uplink synchronization method of the embodiment of the present disclosure is executed by the network equipment of the service cell where the terminal device is located, by receiving the timing advance TA information sent by the network equipment of at least one candidate cell; wherein the TA information of the at least one candidate cell is determined according to the uplink reference signal sent by the terminal device, and TA indication information is sent to the terminal device according to the TA information of the at least one candidate cell, wherein the TA indication information sent to the terminal device includes at least: TA information of the target cell in the at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used for the terminal device to instruct the terminal device to switch to the target cell based on the network equipment of the service cell for uplink synchronization, thereby, before the terminal device performs cell switching, the terminal device obtains the TA information of the target cell in the at least one candidate cell to which the terminal device is to switch according to the TA indication information sent by the network equipment of the service cell where the terminal device is located, so that the terminal device can perform uplink synchronization in a timely manner according to the pre-acquired TA information after the cell switching.

[0282] It should be noted that the explanation of the uplink synchronization method performed on the terminal device in any of the embodiments of Figures 4 to 14 mentioned above is also applicable to the uplink synchronization method performed on the network equipment of the service cell where the terminal device is located in this embodiment. The implementation principle is similar and will not be repeated here.

[0283] In order to implement the above embodiment, the embodiment of the present disclosure proposes a terminal device.

[0284] FIG16 is a schematic structural diagram of a terminal device provided in an embodiment of the present disclosure.

[0285] As shown in FIG. 16 , the terminal device may include a transceiver 1610 , a processor 1620 , and a memory 1630 .

[0286] Among them, the memory 1630 is used to store computer programs; the transceiver 1610 is used to send and receive data under the control of the processor 1620; the processor 1620 is used to read the computer program in the memory 1630 and perform the following operations: sending an uplink reference signal to the network equipment of at least one candidate cell, wherein the uplink reference signal is configured by the network equipment of the service cell where the terminal device is located, and is used by the network equipment of the at least one candidate cell to determine the timing advance TA information; receiving TA indication information sent by the network equipment of the service cell where the terminal device is located; wherein the TA indication information sent by the network equipment of the service cell includes at least: TA information of the target cell in at least one candidate cell to which the terminal device is to switch; the network equipment based on the service cell instructs the terminal device to switch to the target cell, and performs uplink synchronization according to the TA information of the target cell.

[0287] The transceiver 1610 is configured to receive and send data under the control of the processor 1620 .

[0288] In FIG16 , the bus architecture may include any number of interconnected buses and bridges, specifically various circuits connected together by one or more processors represented by processor 1620 and memory represented by memory 1630. The bus architecture may also connect various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 1610 may be a plurality of components, including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium, such as a wireless channel, a wired channel, an optical cable, and the like. For different user devices, the user interface 1640 may also be an interface capable of connecting external or internal devices as required, and the connected devices include but are not limited to a keypad, a display, a speaker, a microphone, a joystick, and the like.

[0289] The processor 1620 is responsible for managing the bus architecture and general processing, and the memory 1630 can store data used by the processor 1620 when performing operations.

[0290] The processor 1620 may be a CPU, an ASIC, an FPGA, or a CPLD, and the processor 1620 may also adopt a multi-core architecture.

[0291] In a possible implementation form of the present disclosure, the uplink reference signal includes at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0292] In a possible implementation form of the present disclosure, receiving TA indication information sent by a network device of a service cell where a terminal device is located includes: receiving a first switching instruction sent by a network device of a service cell where the terminal device is located, wherein the first switching instruction is used to instruct the terminal device to switch to a target cell in at least one candidate cell; the first switching instruction carries TA indication information, and the TA indication information includes cell indication information of the target cell and TA information of the target cell.

[0293] In a possible implementation form of the present disclosure, receiving TA indication information sent by a network device of a service cell where a terminal device is located includes: receiving a first indication message sent by a network device of a service cell where the terminal device is located, wherein the first indication message is used to instruct the terminal device to store or update the TA information of at least one candidate cell; the first indication message carries TA indication information, and the TA indication information includes cell indication information of at least one candidate cell, and TA information of at least one candidate cell.

[0294] In a possible implementation form of the present disclosure, receiving TA indication information sent by a network device of a service cell where the terminal device is located includes: receiving a random access message sent by a network device of a service cell where the terminal device is located, wherein the random access message is sent by a network device of at least one candidate cell to a network device of a service cell and carries TA indication information; the TA indication information includes cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0295] In a possible implementation form of the present disclosure, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel, or a cell index.

[0296] In a possible implementation form of the present disclosure, the TA information includes a TA value or a TA group.

[0297] In a possible implementation form of the present disclosure, the first indication message is a MAC-CE message, or a DCI message.

[0298] In a possible implementation form of the present disclosure, after receiving a first indication message sent by a network device of a service cell where a terminal device is located, it also includes: receiving a second switching instruction sent by a network device of a service cell where the terminal device is located, wherein the second switching instruction is used to instruct the terminal device to switch to a target cell; and the second switching instruction carries cell indication information of the target cell.

[0299] In one possible implementation form of the present disclosure, receiving a first indication message sent by a network device of a serving cell includes: receiving a first indication message periodically sent by the network device of the serving cell; wherein the periodically sent first indication message is generated based on TA information periodically determined by the network device of at least one candidate cell; and also includes: periodically updating the TA information of at least one candidate cell based on the periodically received first indication message.

[0300] In a possible implementation form of the present disclosure, it also includes: receiving a second indication message sent by the network equipment of the serving cell; wherein the second indication message is used to indicate multiple neighboring cells of the serving cell; according to the second indication message, measuring the multiple neighboring cells to obtain measurement result parameters of the multiple neighboring cells; sending the measurement result parameters of the multiple neighboring cells to the network equipment of the serving cell; wherein the measurement result parameters are used by the network equipment of the serving cell to determine at least one candidate cell from the multiple neighboring cells; receiving a third indication message sent by the network equipment of the serving cell, wherein the third indication message is used to instruct the terminal device to send an uplink reference signal to the network equipment of at least one candidate cell.

[0301] In a possible implementation form of the present disclosure, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0302] In a possible implementation form of the present disclosure, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; sending the uplink reference signal to the network equipment of at least one candidate cell includes: based on the power control parameter information being the initial transmission, sending the uplink reference signal to the network equipment of at least one candidate cell at the set power corresponding to the initial transmission; based on the power control parameter being the retransmission, sending the uplink reference signal to the network equipment of at least one candidate cell according to the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information.

[0303] In one possible implementation form of the present disclosure, the power control parameter information includes power increase information; sending an uplink reference signal to the network equipment of at least one candidate cell includes: sending an uplink reference signal to the network equipment of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the power increase information.

[0304] In a possible implementation form of the present disclosure, the method further includes: receiving a second indication message sent by a network device of a serving cell; wherein the second indication message is used to indicate multiple neighboring cells of the serving cell; measuring the multiple neighboring cells according to the second indication message to obtain measurement result parameters of the multiple neighboring cells; and determining at least one candidate cell from the multiple neighboring cells according to the measurement result parameters of the multiple neighboring cells.

[0305] In one possible implementation form of the present disclosure, at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to the set offset; wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0306] In a possible implementation form of the present disclosure, uplink synchronization is performed according to the TA information of the target cell, including: adjusting the transmission time of the physical layer uplink shared channel PUSCH transmission based on the downlink reference timing of the terminal device and using the TA information of the target cell.

[0307] It should be noted here that the terminal device provided in the embodiment of the present disclosure can implement all the method steps implemented in the method embodiments of Figures 4 to 13 above, and can achieve the same technical effects. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0308] In order to implement the above embodiment, the embodiment of the present disclosure further proposes a network device of a service cell where a terminal device is located.

[0309] FIG17 is a schematic structural diagram of a network device in a service cell where a terminal device is located, provided by an embodiment of the present disclosure.

[0310] As shown in FIG. 17 , the network device of the service cell where the terminal device is located may include: a transceiver 1710 , a processor 1720 , and a memory 1730 .

[0311] Among them, the memory 1730 is used to store computer programs; the transceiver 1710 is used to send and receive data under the control of the processor; the processor 1720 is used to read the computer program in the memory and perform the following operations: receiving timing advance TA information sent by the network equipment of at least one candidate cell; wherein the TA information of at least one candidate cell is determined based on the uplink reference signal sent by the terminal device; according to the TA information of at least one candidate cell, TA indication information is sent to the terminal device; wherein the TA indication information sent to the terminal device includes at least: the TA information of the target cell in at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used for the terminal device to instruct the terminal device to switch to the target cell based on the network equipment of the serving cell for uplink synchronization.

[0312] The transceiver 1710 is configured to receive and send data under the control of the processor 1720 .

[0313] In FIG17 , the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors 1720 represented by processor 1720 and memory 1730 represented by memory. The bus architecture may also link together various other circuits such as peripheral devices, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 1710 may be a plurality of components, i.e., a transmitter and a receiver, providing a unit for communicating with various other devices over a transmission medium, such as a wireless channel, a wired channel, an optical cable, or the like. The processor 1720 is responsible for managing the bus architecture and general processing, and the memory 1730 may store data used by the processor 1720 when performing operations.

[0314] The processor 1720 may be a CPU, an ASIC, an FPGA, or a CPLD, and the processor 1720 may also adopt a multi-core architecture.

[0315] In a possible implementation form of the present disclosure, the uplink reference signal includes at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0316] In a possible implementation form of the present disclosure, TA indication information is sent to a terminal device based on the TA information of at least one candidate cell, including: sending a first switching instruction to the terminal device based on the TA information of the target cell in at least one candidate cell; wherein the first switching instruction is used to instruct the terminal device to switch to the target cell in at least one candidate cell; the first switching instruction carries TA indication information, and the TA indication information includes cell indication information of the target cell and TA information of the target cell.

[0317] In a possible implementation form of the present disclosure, TA indication information is sent to the terminal device based on the TA information of the at least one candidate cell, including: sending a first indication message to the terminal device based on the TA information of the at least one candidate cell; wherein the first indication message is used to instruct the terminal device to store or update the TA information of the at least one candidate cell; the first indication message carries TA indication information, and the TA indication information includes cell indication information of the at least one candidate cell, and TA information of the at least one candidate cell.

[0318] In a possible implementation form of the present disclosure, sending TA indication information to the terminal device based on the TA information of the at least one candidate cell includes: sending a random access message to the terminal device, wherein the random access message is sent by the network device of at least one candidate cell to the network device of the server cell, and carries TA indication information; the TA indication information includes cell indication information of at least one candidate cell, and TA information of at least one candidate cell.

[0319] In a possible implementation form of the present disclosure, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel, or a cell index.

[0320] In a possible implementation form of the present disclosure, the TA information includes a TA value or a TA group.

[0321] In a possible implementation form of the present disclosure, the first indication message is a MAC-CE message, or a DCI message.

[0322] In a possible implementation form of the present disclosure, after sending a first indication message to the terminal device based on the TA information of at least one candidate cell, it also includes: sending a second switching instruction to the terminal device; wherein the second switching instruction is used to instruct the terminal device to switch to the target cell; the second switching instruction carries the cell indication information of the target cell.

[0323] In a possible implementation form of the present disclosure, sending a first indication message to the terminal device based on the TA information of the at least one candidate cell includes: periodically sending a first indication message to the terminal device based on the TA information periodically determined by the network device of the at least one candidate cell.

[0324] In a possible implementation form of the present disclosure, it also includes: sending a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple adjacent cells of the serving cell to obtain measurement result parameters of the multiple adjacent cells; receiving the measurement result parameters of the multiple adjacent cells sent by the terminal device; determining at least one candidate cell from the multiple adjacent cells based on the measurement result parameters; and sending a third indication message to the terminal device, wherein the third indication message is used to instruct the terminal device to send an uplink reference signal to the network device of the at least one candidate cell.

[0325] In a possible implementation form of the present disclosure, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0326] In a possible implementation form of the present disclosure, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; based on the power control parameter information being the initial transmission, it is used to indicate that the uplink reference signal is sent to the network equipment of at least one candidate cell at the set power corresponding to the initial transmission; based on the power control parameter being the retransmission, it is used to indicate that the uplink reference signal is sent to the network equipment of at least one candidate cell according to the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information.

[0327] In a possible implementation form of the present disclosure, the power control parameter information includes power increase information; the power increase information is used to send an uplink reference signal to a network device of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the power increase information.

[0328] In a possible implementation form of the present disclosure, it also includes: sending a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple neighboring cells of the serving cell to obtain measurement result parameters of the multiple neighboring cells, and determine the at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0329] In one possible implementation form of the present disclosure, at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to the set offset; wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0330] It should be noted here that the network device of the service cell where the terminal device provided in the embodiment of the present disclosure is located can implement all the method steps implemented in the method embodiment of Figure 15 above, and can achieve the same technical effects. The parts and beneficial effects of this embodiment that are the same as the method embodiment will not be described in detail here.

[0331] Corresponding to the uplink synchronization method provided in the embodiments of Figures 4 to 14 above, the present disclosure also provides an uplink synchronization device. Since the uplink synchronization device provided in the embodiments of the present disclosure corresponds to the uplink synchronization method provided in the embodiments of Figures 4 to 14 above, the implementation method of the uplink synchronization method is also applicable to the synchronization method device provided in the embodiments of the present disclosure, and will not be described in detail in the embodiments of the present disclosure.

[0332] Figure 18 is a schematic diagram of the structure of an uplink synchronization device provided by an embodiment of the present disclosure. It should be noted that the uplink synchronization device is applied to a terminal device.

[0333] As shown in FIG. 18 , the uplink synchronization device 1800 includes a sending unit 1810 , a receiving unit 1820 and a synchronization unit 1830 .

[0334] Among them, the sending unit 1810 is used to send an uplink reference signal to the network equipment of at least one candidate cell, wherein the uplink reference signal is configured by the network equipment of the service cell where the terminal device is located, and is used by the network equipment of at least one candidate cell to determine the timing advance TA information; the receiving unit 1820 is used to receive the TA indication information sent by the network equipment of the service cell where the terminal device is located; wherein the TA indication information sent by the network equipment of the service cell includes at least: the TA information of the target cell in at least one candidate cell to which the terminal device is to switch; the synchronization unit 1830 is used to instruct the terminal device to switch to the target cell based on the network equipment of the service cell, and perform uplink synchronization according to the TA information of the target cell.

[0335] As a possible implementation of the embodiment of the present disclosure, the uplink reference signal includes at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0336] As a possible implementation method of an embodiment of the present disclosure, the receiving unit 1820 is further used to: receive a first switching instruction sent by a network device of a service cell where the terminal device is located, wherein the first switching instruction is used to instruct the terminal device to switch to a target cell in at least one candidate cell; the first switching instruction carries TA indication information, and the TA indication information includes cell indication information of the target cell and TA information of the target cell.

[0337] As a possible implementation method of an embodiment of the present disclosure, the receiving unit 1820 is further used to: receive a first indication message sent by a network device of the service cell where the terminal device is located, wherein the first indication message is used to instruct the terminal device to store or update the TA information of at least one candidate cell; the first indication message carries TA indication information, and the TA indication information includes cell indication information of at least one candidate cell, and TA information of at least one candidate cell.

[0338] As a possible implementation method of an embodiment of the present disclosure, the receiving unit 1820 is further used to: receive a random access message sent by a network device of a service cell where a terminal device is located, wherein the random access message is sent by a network device of the at least one candidate cell to a network device of the service cell and carries TA indication information; the TA indication information includes cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0339] As a possible implementation method of an embodiment of the present disclosure, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel, or a cell index.

[0340] As a possible implementation manner of the embodiment of the present disclosure, the TA information includes a TA value or a TA group.

[0341] As a possible implementation manner of the embodiment of the present disclosure, the first indication message is a MAC-CE message, or a DCI message.

[0342] As a possible implementation method of an embodiment of the present disclosure, the receiving unit 1820 is further used to: receive a second switching instruction sent by a network device of a service cell where the terminal device is located, wherein the second switching instruction is used to instruct the terminal device to switch to a target cell; and the second switching instruction carries cell indication information of the target cell.

[0343] As a possible implementation method of the embodiment of the present disclosure, the receiving unit 1820 is also used to: receive the first indication message periodically sent by the network equipment of the service cell; wherein the periodically sent first indication message is generated based on the TA information periodically determined by the network equipment of at least one candidate cell; the uplink synchronization device also includes: an update unit, the update unit is used to: periodically update the TA information of the at least one candidate cell based on the first indication message periodically received.

[0344] As a possible implementation of the embodiment of the present disclosure, the uplink synchronization device further includes: a first measurement unit.

[0345] Among them, the receiving unit 1820 is also used to receive a second indication message sent by the network equipment of the serving cell; wherein the second indication message is used to indicate multiple neighboring cells of the serving cell; the first measurement unit is used to: measure the multiple neighboring cells according to the second indication message to obtain the measurement result parameters of the multiple neighboring cells; the sending unit is also used to: send the measurement result parameters of the multiple neighboring cells to the network equipment of the serving cell; wherein the measurement result parameters are used by the network equipment of the serving cell to determine the at least one candidate cell from the multiple neighboring cells; the receiving unit 1820 is also used to: receive a third indication message sent by the network equipment of the serving cell, wherein the third indication message is used to instruct the terminal device to send an uplink reference signal to the network equipment of at least one candidate cell.

[0346] As a possible implementation method of an embodiment of the present disclosure, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0347] As a possible implementation method of the embodiment of the present disclosure, the power control parameter information includes the number of times the uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; the sending unit 1810 is used to send the uplink reference signal to the network equipment of at least one candidate cell at a set power corresponding to the initial transmission based on the power control parameter information being the initial transmission; and send the uplink reference signal to the network equipment of at least one candidate cell according to the transmission power of the previous uplink reference signal and the transmission power determined by the set power increase information based on the power control parameter being the retransmission.

[0348] As a possible implementation method of an embodiment of the present disclosure, the power control parameter information includes power increase information; the sending unit 1810 is used to send an uplink reference signal to a network device of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the power increase information.

[0349] As a possible implementation manner of the embodiment of the present disclosure, the uplink synchronization device further includes: a second measuring unit and a determining unit.

[0350] The receiving unit 1820 is further configured to: receive a second indication message sent by the network device of the serving cell; wherein the second indication message is used to indicate multiple neighboring cells of the serving cell; the second measurement unit is configured to: measure the multiple neighboring cells according to the second indication message to obtain measurement result parameters of the multiple neighboring cells; and the determination unit is configured to determine at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0351] As a possible implementation method of an embodiment of the present disclosure, at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to the set offset; wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0352] As a possible implementation of the embodiment of the present disclosure, the synchronization unit 1830 is further configured to adjust the transmission time of the physical layer uplink shared channel PUSCH transmission based on the downlink reference timing of the terminal device and using the TA information of the target cell.

[0353] It should be noted here that the above-mentioned uplink synchronization device provided in the embodiment of the present disclosure can implement all the method steps implemented in the method embodiments of Figures 4 to 14 above, and can achieve the same technical effects. The parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.

[0354] Corresponding to the uplink synchronization method provided in the embodiment of Figure 15 above, the present disclosure also provides an uplink synchronization device. Since the uplink synchronization device provided in the embodiment of the present disclosure corresponds to the uplink synchronization method provided in the embodiment of Figure 15 above, the implementation method of the uplink synchronization method is also applicable to the synchronization method device provided in the embodiment of the present disclosure, and will not be described in detail in the embodiment of the present disclosure.

[0355] Figure 19 is a schematic diagram of the structure of an uplink synchronization device provided by an embodiment of the present disclosure. It should be noted that the uplink synchronization device is applied to a network device in a serving cell where a terminal device is located.

[0356] As shown in FIG. 19 , the uplink synchronization device 1900 includes a receiving unit 1910 and a sending unit 1920 .

[0357] Among them, the receiving unit 1910 is used to receive the timing advance TA information sent by the network equipment of at least one candidate cell; wherein, the TA information of at least one candidate cell is determined based on the uplink reference signal sent by the terminal device; the sending unit 1920 is used to send TA indication information to the terminal device based on the TA information of at least one candidate cell; wherein, the TA indication information sent to the terminal device includes at least: the TA information of the target cell in at least one candidate cell to which the terminal device is to switch; the TA information of the target cell is used for the terminal device to instruct the terminal device to switch to the target cell based on the network equipment of the serving cell for uplink synchronization.

[0358] As a possible implementation of the embodiment of the present disclosure, the uplink reference signal includes at least one of the following: a preamble signal; or a sounding reference signal; or a demodulation reference signal; or an uplink signal transmitted based on a physical layer uplink control channel PUCCH.

[0359] As a possible implementation method of an embodiment of the present disclosure, the sending unit 1920 is further used to: send a first switching instruction to the terminal device based on the TA information of the target cell in at least one candidate cell; wherein the first switching instruction is used to instruct the terminal device to switch to the target cell in at least one candidate cell; the first switching instruction carries TA indication information, and the TA indication information includes the cell indication information of the target cell and the TA information of the target cell.

[0360] As a possible implementation method of an embodiment of the present disclosure, the sending unit 1920 is also used to: send a first indication message to the terminal device based on the TA information of at least one candidate cell; wherein the first indication message is used to instruct the terminal device to store or update the TA information of at least one candidate cell; the first indication message carries TA indication information, and the TA indication information includes cell indication information of at least one candidate cell and TA information of at least one candidate cell.

[0361] As a possible implementation method of an embodiment of the present disclosure, TA indication information is sent to a terminal device based on the TA information of at least one candidate cell, including: sending a random access message to the terminal device, wherein the random access message is sent by the network device of at least one candidate cell to the network device of the server cell, and carries the TA indication information; the TA indication information includes the cell indication information of at least one candidate cell, and the TA information of at least one candidate cell.

[0362] As a possible implementation method of an embodiment of the present disclosure, the cell indication information includes at least one of the following: a cell identification ID; or a cell-associated TCI state; or a cell-associated control resource pool set index; or a cell-associated uplink channel; or a cell index.

[0363] As a possible implementation manner of the embodiment of the present disclosure, the TA information includes a TA value or a TA group.

[0364] As a possible implementation manner of the embodiment of the present disclosure, the first indication message is a MAC-CE message, or a DCI message.

[0365] As a possible implementation method of an embodiment of the present disclosure, the sending unit 1920 is further used to: send a second switching instruction to the terminal device; wherein the second switching instruction is used to instruct the terminal device to switch to the target cell; the second switching instruction carries cell indication information of the target cell.

[0366] As a possible implementation manner of the embodiment of the present disclosure, the sending unit 1920 is further used to: periodically send a first indication message to the terminal device according to TA information periodically determined by the network device of at least one candidate cell.

[0367] As a possible implementation manner of the embodiment of the present disclosure, the uplink synchronization device further includes: a determining unit.

[0368] Among them, the sending unit 1920 is also used to: send a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple adjacent cells of the service cell to obtain measurement result parameters of multiple adjacent cells; the receiving unit 1910 is also used to: receive the measurement result parameters of multiple adjacent cells sent by the terminal device; the determination unit is also used to: determine the at least one candidate cell from the multiple adjacent cells based on the measurement result parameters; the sending unit 1920 is also used to: send a third indication message to the terminal device, wherein the third indication message is used to instruct the terminal device to send an uplink reference signal to the network device of at least one candidate cell.

[0369] As a possible implementation method of an embodiment of the present disclosure, the third indication message carries time-frequency domain resource configuration information of the uplink reference signal; and / or, the third indication message carries power control parameter information of the uplink reference signal; and / or, the third indication message carries configuration information of the transmission beam of the uplink reference signal.

[0370] As a possible implementation method of an embodiment of the present disclosure, the power control parameter information includes the number of times an uplink reference signal is sent, and the number of transmissions is the initial transmission or the retransmission; based on the power control parameter information being the initial transmission, it is used to indicate that an uplink reference signal is sent to a network device of at least one candidate cell at a set power corresponding to the initial transmission; based on the power control parameter information being the retransmission, it is used to indicate that an uplink reference signal is sent to a network device of at least one candidate cell according to a transmission power determined according to the transmission power of the previous uplink reference signal and the set power increase information.

[0371] As a possible implementation method of an embodiment of the present disclosure, the power control parameter information includes power increase information; the power increase information is used to send an uplink reference signal to a network device of at least one candidate cell based on the transmission power of the previous uplink reference signal and the transmission power determined by the power increase information.

[0372] As a possible implementation method of an embodiment of the present disclosure, the sending unit 1920 is further used to: send a second indication message to the terminal device; wherein the second indication message is used to instruct the terminal device to measure multiple neighboring cells of the serving cell to obtain measurement result parameters of the multiple neighboring cells, and determine at least one candidate cell from the multiple neighboring cells based on the measurement result parameters of the multiple neighboring cells.

[0373] As a possible implementation method of an embodiment of the present disclosure, at least one candidate cell is a cell whose measurement result parameter is higher than the set measurement result parameter, and the difference between the measurement result parameter and the set measurement result parameter is greater than or equal to the set offset; wherein the set measurement result parameter is determined based on the measurement result parameter of the serving cell.

[0374] It should be noted here that the above-mentioned uplink synchronization device provided in the embodiment of the present disclosure can implement all the method steps implemented in the method embodiment of Figure 15 above, and can achieve the same technical effects. The parts and beneficial effects of this embodiment that are the same as those of the method embodiment will not be described in detail here.

[0375] It should be noted that the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0376] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a processor-readable storage medium. Based on this understanding, the technical solution of the present disclosure is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute all or part of the steps of the various embodiments of the present disclosure. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), disk or optical disk, and other media that can store program code.

[0377] In order to implement the above embodiments, the embodiments of the present disclosure further provide a processor-readable storage medium.

[0378] The processor-readable storage medium stores a computer program, which is used to enable the processor to execute the uplink synchronization method of any one of the embodiments of Figures 4 to 14 of the present disclosure.

[0379] Among them, the processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, magnetic tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drives (SSDs)), etc.

[0380] In order to implement the above embodiments, the embodiments of the present disclosure further provide a processor-readable storage medium.

[0381] The processor-readable storage medium stores a computer program, which is used to enable the processor to execute the uplink synchronization method described in the embodiment of Figure 15 of the present disclosure.

[0382] Among them, the processor-readable storage medium can be any available medium or data storage device that can be accessed by the processor, including but not limited to magnetic storage (such as floppy disks, hard disks, tapes, magneto-optical disks (MO)), optical storage (such as CDs, DVDs, BDs, HVDs, etc.), and semiconductor storage (such as ROM, EPROM, EEPROM, non-volatile memory (NAND FLASH), solid-state drives (SSDs)), etc.

[0383] In order to implement the above embodiments, the embodiments of the present disclosure also propose a computer program product, including a computer program, which, when executed by a processor, implements the uplink synchronization method of any embodiment of Figures 4 to 14 of the present disclosure, or implements the uplink synchronization method of the embodiment of Figure 15 of the present disclosure.

[0384] In order to implement the above embodiments, the embodiments of the present disclosure also propose a computer program, including computer program code. When the computer program code is run on a computer, the computer executes the uplink synchronization method of any embodiment of Figures 4 to 14 of the present disclosure, or implements the uplink synchronization method of the embodiment of Figure 15 of the present disclosure.

[0385] It should be noted that the above explanations of the embodiments of the uplink synchronization method and apparatus are also applicable to the electronic device, storage medium, computer program product and computer program in the above embodiments, and will not be repeated here.

[0386] Those skilled in the art will appreciate that the embodiments of the present disclosure may be provided as methods, systems, or computer program products. Therefore, the present disclosure may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present disclosure may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage, etc.) containing computer-usable program code.

[0387] The present disclosure is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present disclosure. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer-executable instructions. These computer-executable instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device produce a device for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0388] These processor-executable instructions may also be stored in a processor-readable memory that can direct a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the processor-readable memory produce a product including an instruction device that implements the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0389] These processor-executable instructions may also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, whereby the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more processes in the flowchart and / or one or more boxes in the block diagram.

[0390] Obviously, those skilled in the art may make various changes and modifications to the present disclosure without departing from the spirit and scope of the present disclosure. Thus, if these modifications and variations of the present disclosure fall within the scope of the claims of the present disclosure and their equivalents, the present disclosure is intended to include these modifications and variations.

[0391] All embodiments of the present disclosure may be implemented individually or in combination with other embodiments, and are all considered to be within the scope of protection claimed by the present disclosure.

Claims

DEPCT6813 / 01 / 25681. Uplink synchronization method, performed by the terminal device, which includes: the transmission of an uplink reference signal to the network device of at least one optional cell, where the uplink reference signal is configured by the network device of the service cell to which the terminal device is located, and is used to determine the shift information (TA) by the network device of at least one optional cell; the reception of the TA information transmitted by the network device of the service cell to which the terminal device is located, where the TA information transmitted by the network device of the service cell includes at least: the TA information of the target cell to which the terminal device will be switched among at least one optional cell; and the execution of uplink synchronization based on the TA information of the target cell, based on the network device of the service cell that instructs the terminal device to switch to the target cell.

2. Uplink synchronization method according to claim 1,Where the uplink reference signal consists of at least one of: the leading signal; the frequency reference signal; the separation reference signal; and the uplink signal transmitted over the physical uplink control channel (PUCCH).

3. Uplink synchronization method according to claim 1 or 2, where the receipt of TA identification information transmitted by the network device of the service cell where the terminal is located consists of: the receipt of the first switching command transmitted by the network device of the service cell where the terminal is located, where the first switching command is used to instruct the terminal to switch to the target cell among at least one selectable cell, where the first switching command contains TA identification information consisting of the target cell identification information and the target cell TA information.

4. Uplink synchronization method according to claim 1 or 2,Where the receipt of TA identification information sent by the network device of the service cell where the terminal is located consists of: the receipt of the first command message sent by the network device of the service cell where the terminal is located, where the first command message is used to instruct the terminal to store or update the TA information of at least one optional cell; where the first command message contains TA identification information consisting of the cell identification information of at least one optional cell and the TA information of at least one optional cell.

5. Uplink synchronization method according to claim 1 or 2, where the receipt of TA identification information sent by the network device of the service cell where the terminal is located consists of: the receipt of a random access message sent by the network device of the service cell where the terminal is located, where the random access message is sent from the network device of at least one optional cell to the network device of the service cell, and contains TA identification information.

6. Uplink synchronization method under claim 3, 4, or 5, where the cell identification information includes at least one of: the identification document (ID); the transmission configuration identifier (TCI) status associated with the cell; the control resource index associated with the cell; the uplink channel associated with the cell; and the cell index.

7. Uplink synchronization method under claim 3, 4, or 5, where the TA information includes the TA value or TA group.

8. Uplink synchronization method under claim 4, where the first command message is a MAC control element (MAC-CE) message or a downlink control information (DCI) message.

9. Uplink synchronization method under claim 4, where, after receiving the first command message sent by the network device of the service cell where the terminal is located, the uplink synchronization method also includes: receiving the second switching command sent by the network device of the service cell where the terminal is located.Where the second switching command is used to instruct the terminal device to switch to the target cell; where the second switching command contains the cell identification information of the target cell.

10. Uplink synchronization method under claim 4, where the reception of the first command message sent by the service cell network device includes: the periodic reception of the first command message sent by the service cell network device, where the periodic first command message is generated based on the TA information periodically determined by the network device of at least one optional cell; the uplink synchronization method further includes: the periodic updating of the TA information of at least one optional cell based on the periodic reception of the first command message.

11. Uplink synchronization method under any one of claims 1 through 10, which further includes: the reception of the second command message sent by the service cell network device,Where the second command message is used to instruct multiple adjacent cells of the service cell; the measurement of multiple adjacent cells according to the second command message, in order to obtain the measurement result parameters of multiple adjacent cells; the transmission of the measurement result parameters of multiple adjacent cells to the service cell's network device, where the measurement result parameters are used by the service cell's network device to determine at least one selectable cell from multiple adjacent cells; and the reception of the third command message sent by the service cell's network device, where the third command message is used to instruct the terminal device to send an uplink reference signal to the network device of at least one selectable cell.

12. Uplink synchronization method according to claim 11.Where the third instruction message contains the time-frequency domain resource configuration information of the uplink reference signal; and / or the third instruction message contains the power control parameter information of the uplink reference signal; and / or the third instruction message contains the transmission stream configuration information of the uplink reference signal.

13. Uplink synchronization method according to claim 12, where the power control parameter information includes the number of uplink reference signal transmissions, which is the initial transmission or a repeated transmission; and the uplink reference signal transmission to the network device of at least one optional cell includes: the uplink reference signal transmission to the network device of at least one optional cell at the power set corresponding to the initial transmission, based on the power control parameter information of the initial transmission; and the uplink reference signal transmission to the network device of at least one optional cell at the transmission power determined by the transmission power of the previous uplink reference signal and the power increase information.Based on the power control parameter information that is a repeated transmission,14. The uplink synchronization method according to claim 12, where the power control parameter information includes power boost information; and the uplink reference signal to the network device of at least one optional cell includes: the uplink reference signal to the network device of at least one optional cell whose transmission power is determined by the transmission power of the previous uplink reference signal and the power boost information.

15. The uplink synchronization method according to one of claims 1 through 10, which further includes: the reception of a second command message sent by the network device of the service cell, where the second command message is used to command multiple adjacent cells of the service cell; the measurement of multiple adjacent cells according to the second command message.To obtain the measurement result parameters of multiple adjacent cells; and to determine at least one selectable cell from multiple adjacent cells based on the measurement result parameters of multiple adjacent cells.

16. Uplink synchronization method according to claim 11 or 15, where at least one selectable cell is a cell whose measurement result parameter is higher than the set measurement result parameter and the difference between its measurement result parameter and the set measurement result parameter is greater than or equal to the set offset, where the set measurement result parameter is determined based on the measurement result parameters of the service cell.

17. Uplink synchronization method according to one of claims 1 to 15, where the uplink synchronization operation based on the target cell's TA information includes: adjusting the transmission time of the shared channel transmission for the physical uplink (PUSCH) using the target cell's TA information based on the terminal's downlink reference timing.

18. Uplink synchronization method,This is performed by the network device of the service cell to which the terminal is located, and includes: receiving the shift timing information (TA) sent by the network device of at least one optional cell, whereby the TA information of at least one optional cell is determined based on the uplink reference signal sent by the terminal; and sending the indication TA information to the terminal based on the TA information of at least one optional cell, whereby the TA information sent to the terminal contains at least the TA information of the target cell to be switched by the terminal among at least one optional cell, and the target cell TA information is used by the terminal to perform uplink synchronization based on the network device of the service cell that instructs the terminal to switch to the target cell.

19. Uplink synchronization method according to claim 18,Where the uplink reference signal consists of at least one of: the leading signal; the frequency reference signal; the signal separation reference signal; and the uplink signal transmitted over the physical uplink control channel (PUCCH).

20. Uplink synchronization method according to claim 18 or 19, where the transmission of TA indication information to the terminal based on the TA information of at least one optional cell consists of: the transmission of switching command one to the terminal based on the target cell's TA information among at least one optional cell, where switching command one is used to instruct the terminal to switch to the target cell among at least one optional cell; where switching command one contains TA indication information consisting of the target cell's cell indication information and the target cell's TA information.

21. Uplink synchronization method according to claim 18 or 19,Where the transmission of TA identification information to the terminal device based on the TA information of at least one optional cell includes: the transmission of the first command message to the terminal device based on the TA information of at least one optional cell, where the first command message is used to instruct the terminal device to store or update the TA information of at least one optional cell; where the first command message contains TA identification information comprising the cell identification information of at least one optional cell and the TA information of at least one optional cell.

22. Uplink synchronization method under claim 18 or 19, where the transmission of TA identification information to the terminal device based on the TA information of at least one optional cell includes: the transmission of a random access message to the terminal device, where the random access message is sent from the network device of at least one optional cell to the network device of the service cell and contains TA identification information,23. Uplink synchronization method under claim 20, 21, or 22, where the cell identification information includes at least one of: the identification document (ID); the transmission configuration identifier (TCI) associated with the cell; the control resource index associated with the cell; the uplink channel associated with the cell; and the cell index.

24. Uplink synchronization method under claim 20, 21, or 22, where the TA information includes the TA value or TA group.

25. Uplink synchronization method under claim 21, where the first command message is a MAC control element (MAC-CE) message or a downlink control information (DCI) message.

26. Coupling synchronization method under claim 21, where after the first command message is sent to the terminal based on the TA information of at least one optional cell, the uplink synchronization method includes: the transmission of a second switching command to the terminal.Where the second switching command is used to instruct the terminal to switch to the target cell; and the second switching command contains the cell identification information of the target cell.

27. Uplink synchronization method under claim 21, where the transmission of the first command message to the terminal based on the TA information of at least one optional cell includes: periodic transmission of the first command message to the terminal based on the TA information periodically determined by the network device of at least one optional cell.

28. Uplink synchronization method under any one of claims 18 through 27, which additionally includes: transmission of the second command message to the terminal,Where the second command message is used to instruct the terminal device to measure multiple adjacent cells of the service cell to obtain the measurement result parameters of those multiple cells; to receive the measurement result parameters of those multiple cells sent by the terminal device; to select at least one selectable cell from multiple adjacent cells based on the measurement result parameters; and to send a third command message to the terminal device, where the third command message is used to instruct the terminal device to send an uplink reference signal to the network device of at least one selectable cell.

29. Uplink synchronization method under claim 28, where the third command message contains the time-frequency domain resource configuration information of the uplink reference signal; and / or the third command message contains the power control parameter information of the uplink reference signal; and / or the third command message contains the transmission stream information of the uplink reference signal.

30. Uplink synchronization method under claim 29,Where the power control parameter information comprises the number of uplink reference signal passes that are either the initial pass or the repeated pass; the initial power control parameter information indicates the uplink reference signal being sent to the network device of at least one optional cell at the power setting corresponding to the initial pass; the repeated power control parameter information indicates the uplink reference signal being sent to the network device of at least one optional cell at the power transmission determined by the power transmission of the previous uplink reference signal and the power boost information.

31. Uplink synchronization method according to claim 29, where the power control parameter information comprises the power boost information; and the uplink reference signal is sent to the network device of at least one optional cell at the power transmission determined by the power transmission of the previous uplink reference signal and the power boost information.

32. Uplink synchronization method according to any one of claims 18 through 27,This is further comprised of: sending a second command message to the terminal device, where the second command message is used to instruct the terminal device to measure multiple adjacent cells of the service cell to obtain the measurement result parameters of the multiple adjacent cells, and to determine at least one selectable cell from multiple adjacent cells based on the measurement result parameters of the multiple adjacent cells.

33. The uplink synchronization method under claim 28 or 32, where at least one selectable cell is a cell whose measurement result parameter is higher than the set measurement result parameter and the difference between its measurement result parameter and the set measurement result parameter is greater than or equal to the set offset, where the set measurement result parameter is determined based on the measurement result parameters of the service cell.

34. The terminal device, which includes memory, transceiver, and processor.Where the memory is configured to store the computer program; the transceiver is configured to transmit and receive data under the control of the processor; the processor is configured to read the computer program from memory and perform the following operations: sending an uplink reference signal to the network device of at least one optional cell, where the uplink reference signal is configured by the network device of the service cell where the terminal is located, and is used to determine the time shift information (TA) by the network device of at least one optional cell; receiving the TA information transmitted by the network device of the service cell where the terminal is located, where the TA information transmitted by the network device of the service cell includes at least: the target cell TA information to be switched by the terminal among at least one optional cell; and performing uplink synchronization based on the target cell TA information.Based on the network device of the service cell that instructs the terminal to switch to the target cell.

35. The terminal under claim 34, where the uplink reference signal consists of at least one of: the leading signal; the phono reference signal; the splitting reference signal; and the uplink signal transmitted over the physical uplink control channel (PUCCH).

36. The terminal under claim 34 or 35, where the reception of TA identification information transmitted by the network device of the service cell where the terminal is located consists of: the reception of the first switching command transmitted by the network device of the service cell where the terminal is located, where the first switching command is used to instruct the terminal to switch to the target cell among at least one selectable cell, where the first switching command contains TA identification information consisting of the target cell identification information and the target cell TA information.

37. The network device for the service cell where the terminal is located, consisting of memory, transceiver, and processor, where,The memory is configured to store the computer program; the transceiver is configured to transmit and receive data under the control of the processor; the processor is configured to read the computer program from memory and perform the following operations: receiving the time shift information (TA) transmitted by the network device of at least one optional cell, where the TA information of at least one optional cell is determined based on the uplink reference signal transmitted by the terminal device; and transmitting the TA information to the terminal device based on the TA information of at least one optional cell, where the TA information transmitted to the terminal device contains at least the TA information of the target cell to be switched by the terminal device among at least one optional cell, and the TA information of the target cell is used by the terminal device to perform uplink synchronization based on the network device of the service cell that instructs the terminal device to switch to the target cell.

38. Network device under claim 37,Where the uplink reference signal consists of at least one of: the leading signal; the frequency reference signal; the separation reference signal; and the uplink signal transmitted over the physical uplink control channel (PUCCH).

39. The network device under claim 37 or 38, where the transmission of TA indication information to the terminal device based on the TA information of at least one optional cell, consists of: the transmission of switching command one to the terminal device based on the TA information of the target cell among at least one optional cell, where switching command one is used to instruct the terminal device to switch to the target cell among at least one optional cell; switching command one contains TA indication information consisting of the cell indication information of the target cell and the TA information of the target cell.

40. The uplink synchronization instrument, which consists of: the transmitting unit, which is configured to transmit the uplink reference signal to the network device of at least one optional cell,Where the uplink reference signal is configured by the network device of the service cell where the terminal is located, and is used to determine the shift information (TA) by the network device of at least one optional cell; the receiving unit, configured to receive the TA information sent by the network device of the service cell where the terminal is located, where the TA information sent by the network device of the service cell includes at least: the TA information of the target cell to be switched to by the terminal among at least one optional cell; and the synchronization unit, configured to perform uplink synchronization based on the target cell TA information, based on the network device of the service cell instructing the terminal to switch to the target cell.

41. Uplink synchronization instrument, which includes: the receiving unit, configured to receive the shift information (TA) sent by the network device of at least one optional cell,Where the TA information of at least one optional cell is determined based on the uplink reference signal sent by the terminal device; and the transmitting unit, which is configured to send TA indication information to the terminal device based on the TA information of at least one optional cell, where the TA indication information sent to the terminal device contains at least the TA information of the target cell to be switched by the terminal device in at least one optional cell, and the TA information of the target cell is used by the terminal device to perform uplink synchronization based on the network device of the service cell that instructs the terminal device to switch to the target cell.

42. Processor-readable storage medium, where the processor-readable storage medium stores computer programs for enabling the processor to perform uplink synchronization methods as claimed in any of Claims 1-17 or uplink synchronization methods as claimed in any of Claims 18-33.

43. Computer program products,Where the computer program product consists of a computer program which, when executed by a processor, implements the uplink synchronization method as claimed in any of Claims 1-17 or the uplink synchronization method as claimed in any of Claims 18-33;44. The computer program, where the computer program consists of computer program code which, when executed on a computer, causes the computer to execute the uplink synchronization method as claimed in any of Claims 1-17 or the uplink synchronization method as claimed in any of Claims 18-33;

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