Uplink synchronization method and apparatus, and terminal, network device and readable storage medium

Abstract

The present disclosure is applied to the field of wireless technology. Provided are an uplink synchronization method and apparatus, and a terminal, a network device and a readable storage medium. The method comprises: acquiring a first time difference and a second time difference, wherein the first time difference is the time difference between a sending time of a first signal under test of a candidate cell and a sending time of a second signal under test of a serving cell, and the second time difference is the time difference between a reception time of the first signal under test and a reception time of the second signal under test; determining a second time advance of the candidate cell on the basis of a first time advance of the serving cell, the first time difference and the second time difference; and executing uplink synchronization with the candidate cell on the basis of the second time advance.

Description

Uplink synchronization method, device, terminal, network equipment and readable storage medium

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202410060769.6 filed in China on January 16, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present disclosure relates to the field of wireless technology, and in particular to an uplink synchronization method, apparatus, terminal, network equipment, and readable storage medium. Background Art

[0004] To achieve uplink synchronization, the fifth generation mobile communication technology (5G) communication system uses a timing advance mechanism. The timing advance (TA) is a command sent by the base station to the user equipment (UE) to adjust its uplink transmission.

[0005] When a serving cell changes, the UE needs to obtain the target cell's TA value before accessing the target cell. The uplink synchronization process for accessing the target cell is completed using the Random Access Channel (RACH) process. During the synchronization process, the differences in reaching the same UE from different base stations are exploited. When the UE performs L1 measurements in Low Latency Mobility (LTM), the UE can derive the Reference Signal Timing Difference (RSTD) based on measurements of the Synchronization Signal and Physical Broadcast Channel (PBCH) block (SSB) of the serving and candidate cells. The UE can determine the candidate cell's TA based on the serving cell TA and RSTD, and directly apply this to uplink (UL) transmissions after cell handover.

[0006] However, this uplink synchronization process has the problems of large delay, high RACH resource occupation, easy collision, and failure to meet the requirements of precise TA alignment, making it unsuitable for various scenarios. Summary of the Invention

[0007] The purpose of the technical solution disclosed in the present invention is to provide an uplink synchronization method, apparatus, terminal, network equipment and readable storage medium, which are used to solve the problems of large delay in the uplink synchronization process of related technologies and the inability to meet the precise TA alignment requirements in various scenarios.

[0008] One embodiment of the present disclosure provides an uplink synchronization method, wherein the method is performed by a terminal, and the method includes:

[0009] Obtain a first time difference and a second time difference; wherein the first time difference is the time difference between the transmission time of the first measured signal of the candidate cell and the transmission time of the second measured signal of the serving cell, and the second time difference is the time difference between the time when the terminal receives the first measured signal and the time when the terminal receives the second measured signal;

[0010] determining a second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference;

[0011] Uplink synchronization with the candidate cell is performed according to the second timing advance.

[0012] Optionally, in the uplink synchronization method, obtaining the first time difference includes:

[0013] Obtain the first time difference sent by the serving cell.

[0014] Optionally, in the uplink synchronization method, the acquiring the first time difference sent by the serving cell includes:

[0015] The first time difference is obtained, which is sent by the serving cell through radio resource control RRC signaling or media access control MAC element CE signaling.

[0016] Optionally, in the uplink synchronization method, the first time difference is the difference between the start time of the Nth frame of one sending period of the second measured signal and the start time of the Nth frame of the corresponding sending period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0017] Optionally, the uplink synchronization method, wherein determining the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference, includes:

[0018] A second timing advance of the candidate cell is determined according to a difference between the second time difference and the first time difference and the first timing advance.

[0019] Optionally, the uplink synchronization method, wherein determining the second timing advance of the candidate cell according to the difference between the first time difference and the second time difference and the first timing advance, includes:

[0020] The second timing advance is determined according to the following formula: TA'=TA+2(ΔTr-ΔT);

[0021] TA' is the second timing advance, TA is the first timing advance, ΔTr is the second time difference, and ΔT is the first time difference.

[0022] Optionally, in the uplink synchronization method, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0023] One embodiment of the present disclosure further provides an uplink synchronization method, wherein the method is performed by a serving cell and includes:

[0024] A first time difference is sent to the terminal, where the first time difference is a time difference between a sending time of a first measured signal of a candidate cell of the terminal and a sending time of a second measured signal of a serving cell.

[0025] Optionally, the uplink synchronization method further includes:

[0026] Obtaining the transmission time of the first measured signal of the candidate cell by one or more of the following methods:

[0027] The candidate cell transmits the data via an inter-station interface or a cell interface between the candidate cell and the candidate cell;

[0028] Network management equipment transmission.

[0029] Optionally, in the uplink synchronization method, the first time difference is the difference between the start time of the Nth frame of one sending period of the second measured signal and the start time of the Nth frame of the corresponding sending period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0030] Optionally, in the uplink synchronization method, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0031] One embodiment of the present disclosure further provides a terminal, including a processor, wherein the processor is configured to:

[0032] Obtain a first time difference and a second time difference; wherein the first time difference is the time difference between the transmission time of the first measured signal of the candidate cell and the transmission time of the second measured signal of the serving cell, and the second time difference is the time difference between the time when the terminal receives the first measured signal and the time when the terminal receives the second measured signal;

[0033] determining a second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference;

[0034] Uplink synchronization with the candidate cell is performed according to the second timing advance.

[0035] One embodiment of the present disclosure further provides a network device, wherein the network device is a network device corresponding to a serving cell, and includes a transceiver configured to:

[0036] A first time difference is sent to the terminal, where the first time difference is a time difference between a sending time of a first measured signal of a candidate cell of the terminal and a sending time of a second measured signal of a serving cell.

[0037] One embodiment of the present disclosure further provides an uplink synchronization device, wherein the device is applied to a terminal, and includes:

[0038] an acquisition module, configured to acquire a first time difference and a second time difference; wherein the first time difference is a time difference between a transmission time of a first measured signal of a candidate cell and a transmission time of a second measured signal of a serving cell, and the second time difference is a time difference between a time when the terminal receives the first measured signal and a time when the terminal receives the second measured signal;

[0039] a determining module, configured to determine a second timing advance of the candidate cell based on the first timing advance of the serving cell, the first time difference, and the second time difference;

[0040] A synchronization module is used to perform uplink synchronization with the candidate cell according to the second timing advance.

[0041] One embodiment of the present disclosure further provides an uplink synchronization device, which is applied to a serving cell and includes:

[0042] The sending module is configured to send a first time difference to the terminal, wherein the first time difference is a time difference between a sending time of a first measured signal of a candidate cell of the terminal and a sending time of a second measured signal of a serving cell.

[0043] One embodiment of the present disclosure further provides a terminal, which includes a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the uplink synchronization method as described in any one of the above items.

[0044] One embodiment of the present disclosure further provides a network device, which includes a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the uplink synchronization method as described in any one of the above items.

[0045] One embodiment of the present disclosure further provides a readable storage medium, wherein a program is stored on the readable storage medium, and when the program is executed by a processor, the steps in the uplink synchronization method as described in any one of the above items are implemented.

[0046] At least one of the above technical solutions of the present disclosure has the following beneficial effects:

[0047] With the uplink synchronization method described in the embodiment of the present disclosure, the terminal obtains a first time difference between a transmission time of a measured signal of a candidate cell and a transmission time of a reference signal of a serving cell, and obtains a second time difference between the terminal receiving the measured signal and the reference signal. Based on the first time difference, the second time difference, and the first timing advance of the serving cell, the terminal can determine a second timing advance of the candidate cell for performing uplink synchronization with the candidate cell. With this method, uplink synchronization can be avoided through a RACH access process, thereby avoiding the problems of large delay and RACH resource conflict in the synchronization process. In addition, with this method, there is no need to perform signal measurement based on the terminal, so there is no problem of low measurement accuracy due to asynchrony of the measurement signal, which cannot meet the precise TA alignment requirements in various scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] FIG1 is a schematic diagram of a flow chart of an uplink synchronization method according to a first embodiment of the present disclosure;

[0049] FIG2 is a flow chart of a specific implementation of the uplink synchronization method according to an embodiment of the present disclosure;

[0050] FIG3 is a schematic diagram of a flow chart of an uplink synchronization method according to a second embodiment of the present disclosure;

[0051] FIG4 is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

[0052] FIG5 is a schematic diagram of the structure of a network device according to an embodiment of the present disclosure;

[0053] FIG6 is a schematic structural diagram of an uplink synchronization device according to a first embodiment of the present disclosure;

[0054] FIG7 is a schematic structural diagram of an uplink synchronization device according to a second embodiment of the present disclosure. DETAILED DESCRIPTION

[0055] In order to make the technical problems, technical solutions and advantages to be solved by the present disclosure clearer, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0056] The 5G communication system uses an Orthogonal Frequency Division Multiplexing (OFDM) transmission scheme. Only when each subcarrier maintains orthogonality can the system achieve good demodulation performance. Uplink transmission is multi-UE transmission, and the next-generation Node B (gNB) receives signals from multiple UEs simultaneously. To ensure the orthogonality of uplink transmission, the time at which signals from different UEs at the same time arrive at the gNB must be substantially aligned. Typically, the gNB can correctly decode the uplink data sent by the UE if it receives it within the cyclic prefix (CP) range. In addition, to maintain orthogonality between uplink reference signals using different cyclic shifts, the received uplink reference signals must also be time-aligned.

[0057] To achieve uplink synchronization, 5G communication systems use a timing advance mechanism. TA is a command sent by the base station to the UE to adjust its uplink transmission. From the UE's perspective, TA is essentially the offset between the start time of the received downlink frame and the time of the uplink frame transmission. Due to transmission latency, downlink signals require Δt to be received by the UE. If the UE receives downlink signals and transmits uplink signals synchronously, the uplink signals transmitted by the UE will be offset by 2Δt from the gNB's timing. By appropriately controlling the offset for each UE, the gNB can ensure that uplink signals from different UEs arrive at the gNB at nearly the same time.

[0058] The TA acquisition process in related technologies is mainly completed through the Timing Advance Command (TAC) field. The main process is:

[0059] 1) Random access process

[0060] During the random access process, the base station determines the TA value by measuring the received preamble and sends it to the UE through the Timing Advance Command field (12 bits in total, corresponding to a TA index value ranging from 0 to 3846) of the Random Access Response (RAR).

[0061] 2) Business Process

[0062] Although the UE and the base station have achieved uplink synchronization during the random access process, the timing of the uplink signal reaching the base station may change over time. Therefore, the UE needs to continuously update its uplink timing advance to maintain uplink synchronization. The base station determines the TA value through uplink signals (such as the Sounding Reference Signal (SRS), Physical Uplink Shared Channel (PUSCH), etc.) and sends the TAC to the UE through the Timing Advance Command Media Access Control Control Element (MAC CE).

[0063] The Timing Advance Command field is 6 bits long, and the corresponding TA index value ranges from 0 to 63. The UE saves the most recent timing advance adjustment value, NTA_old. When the UE receives a new Timing Advance Command, it calculates the latest TA adjustment value, NTA_new, using the following formula:

[0064] N TA_new =N TA_old +(T A -31)·16·64 / 2 μ .

[0065] 3) Service cell changes occur

[0066] Due to the different distances from different serving cells or the differences in the actual channels experienced, when the serving cell changes, the UE needs to obtain the TA value of the target cell before accessing the target cell. The uplink synchronization process is completed using the RACH process.

[0067] In a synchronous system, the differences in the arrival times of different base stations at the same UE are exploited. When the UE performs L1 measurements in LTM, it can derive the RSTD based on the measurements of the SSBs of the serving and candidate cells. The UE can then determine the TA of the candidate cell based on the serving cell TA and RSTD, and directly apply this to the uplink (UL) transmission after cell handover.

[0068] In the above uplink synchronization process, time synchronization is performed using RACH access before a connection is established with the cell. Since at least two messages, MSG1 and MSG2, are required, the feedback delay is at least 10ms. The UE can only send subsequent messages and perform data transmission after uplink synchronization. During the period of non-synchronization, the UE cannot communicate with the network, resulting in a long synchronization delay. In addition, since RACH resources are used for initial access and handover, the number of RACH preambles is limited. When the number of accesses or handovers increases, conflicts are likely to occur, which may even lead to access denial due to the increased delay.

[0069] Moreover, when using the terminal to measure RSTD to obtain TA, the time of different measurement signals is not synchronized. The measurement object of the existing system can be SSB or Channel State Information-Reference Signal (CSI-RS) and other signals. Since the position of CSI-RS is not fixed, the measurement accuracy is low and cannot meet the goal of accurate TA alignment. For the Frequency Division Duplexing (FDD) system, since the time synchronization accuracy requirements of different cells are not high, it is difficult to accurately obtain the TA of the candidate cell through the measurement of the downlink signal. For the heterogeneous frequency system, due to the difference in channels, the time synchronization accuracy of different frequency bands is small, and even the frame structure is not exactly the same. Therefore, the uplink synchronization method using related technologies still has the problem of low measurement accuracy and cannot meet the requirements of accurate TA alignment. This synchronization method cannot be applied to multiple scenarios.

[0070] To solve the above technical problems, an embodiment of the present disclosure provides an uplink synchronization method, in which a terminal obtains a first time difference between a measured signal sent by a candidate cell and a reference signal sent by a serving cell, and obtains a second time difference between the measured signal and the reference signal received by the terminal. Based on the first time difference, the second time difference, and the first timing advance of the serving cell, the terminal can determine the second timing advance of the candidate cell, which is used to perform uplink synchronization with the candidate cell. Using this method, uplink synchronization can be avoided through a RACH access process, thereby avoiding the problems of large delay and RACH resource conflicts in the synchronization process. In addition, using this method, there is no need to perform signal measurement based on the terminal, so there is no problem of low measurement accuracy due to asynchrony of the measurement signal, which cannot meet the precise TA alignment requirements in various scenarios.

[0071] One embodiment of the present disclosure provides an uplink synchronization method, which is performed by a terminal, as shown in FIG1 , and includes:

[0072] S110: Obtain a first time difference and a second time difference; wherein the first time difference is a time difference between a transmission time of a first measured signal of a candidate cell and a transmission time of a second measured signal of a serving cell, and the second time difference is a time difference between a time when the terminal receives the first measured signal and a time when the terminal receives the second measured signal;

[0073] S120, determining a second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference;

[0074] S130: Perform uplink synchronization with the candidate cell according to the second timing advance.

[0075] In the embodiment of the present disclosure, optionally, in step S110, obtaining the first time difference includes:

[0076] Obtain the first time difference sent by the serving cell.

[0077] Optionally, the serving cell is a cell that is currently connected to the terminal, that is, a radio resource control (RRC) connection has been established between the terminal and the serving cell or there is data interaction, and the terminal has a normal TA uplink synchronization relationship with the serving cell, for example, the terminal obtains TAC through Timing Advance Command MAC CE, and the TAC includes the current TA of the serving cell.

[0078] In one embodiment, optionally, multiple cells negotiate the sending time of a reference signal or a synchronization signal through information interaction, and the serving cell obtains a first time difference between sending the first measured signal and sending the second measured signal based on the sending time of the second measured signal of the serving cell and the sending time of the first measured signal of the candidate cell of the terminal, and sends the obtained first time difference to the terminal.

[0079] Optionally, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0080] Optionally, the transmission time exchanged between multiple cells may be absolute time or relative time, and the corresponding transmission time difference may be determined according to the absolute time or relative time of the two.

[0081] In one embodiment, optionally, the time difference is the difference between the start time of the Nth frame of one sending period of the second measured signal and the start time of the Nth frame of the corresponding sending period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0082] Since the reference signal or synchronization signal of the serving cell and the reference signal or synchronization signal of the candidate cell are generally sent periodically, the first time difference can be defined as the difference between the start times of the Nth frame in a single system frame structure. For example, N is 1, that is, the first time difference is the difference between the start times of the first frames in a single system frame structure, such as the start time of the first burst in a 5G SSB full cycle burst. The time of the first burst of the reference signal (the second measured signal) sent by the serving cell is taken as the reference 0 time. The time point of the first burst of the periodic signal corresponding to the second measured signal of the candidate cell is taken as the difference between the two to obtain the corresponding first time difference.

[0083] In one embodiment of the present disclosure, optionally, the serving cell may obtain the transmission time (first transmission time) of the first measured signal of the candidate cell through an inter-station interface or a cell interface (e.g., one or more of the Xn interface, F1AP, X2AP, XnAP, etc.); in another embodiment, optionally, the serving cell may obtain the transmission time of the first measured signal of the candidate cell through a network management device. In this way, based on the obtained transmission time (first transmission time) of the first measured signal of the candidate cell and the transmission time (second transmission time) of the second measured signal of the serving cell, a first time difference between the transmission of the first measured signal by the candidate cell and the transmission of the second measured signal by the serving cell is determined.

[0084] Optionally, the first time difference may be an absolute time (for example, in ns) or a relative time (for example, in 1 / 128 symbol).

[0085] For example, the serving cell determines that the first time difference between the candidate cell sending the first measured signal and the serving cell sending the second measured signal is 100 ns.

[0086] In the embodiment of the present disclosure, optionally, the serving cell and the candidate cell may periodically exchange the sending time of the reference signal or the synchronization signal.

[0087] In an embodiment of the present disclosure, after determining the first time difference, the serving cell sends the first time difference to the terminal. Optionally, the terminal obtains the first time difference sent by the serving cell, including:

[0088] The first time difference is obtained, which is sent by the serving cell through radio resource control RRC signaling or media access control MAC element CE signaling.

[0089] Optionally, the first time difference sent by the serving cell may be acquired through RRC measurement control information (measurement Control Information).

[0090] Specifically, since each measurement object (first measured signal) defines the measurement target, for example, an NR measurement object may include only SSB configuration or CSI-RS configuration, or it may include both pilot configurations at the same time. Since the transmission time difference between each measurement object and the serving cell is fixed, the first time difference can be added as an attribute of this measurement object to carry out measurement. Assuming that the first time difference is △T, the unit can be symbol, or us (microsecond, nanosecond) and other time units.

[0091] Optionally, the first time difference sent by the serving cell to the terminal is transmitted over the air interface. A new information element (IE) time difference may be added to the air interface RRC standard, or a parameter with similar functions such as Timedifference::=INTEGER(0..65535) may be used to transmit the first time difference. The information element IE may be included in information fields such as MeasObjectNR or radio resource control information elements.

[0092] In the embodiment of the present disclosure, as shown in FIG1 , in step S120, determining the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference includes:

[0093] A second timing advance of the candidate cell is determined according to a difference between the second time difference and the first time difference and the first timing advance.

[0094] Optionally, determining the second timing advance of the candidate cell according to the difference between the second time difference and the first time difference and the first timing advance includes:

[0095] The second timing advance is determined according to the following formula: TA'=TA+2(ΔTr-ΔT);

[0096] TA' is the second timing advance, TA is the first timing advance, ΔTr is the second time difference, and ΔT is the first time difference.

[0097] In the disclosed embodiment, the terminal performs measurements according to the instructions of the serving cell, records the reception time of the second measured signal of the serving cell and the reception time of the first measured signal of the candidate cell, and determines the difference between the two reception times to obtain a second time difference ΔTr (when the first measured signal is in front, ΔTr takes a negative value). At the same time, the UE tracks the changes in the TA in the serving cell, such as obtaining the current TA value of the serving cell through the TAC issued by the serving cell, and further calculates the TA value of the measured signal of the candidate cell based on the TA value of the current serving cell, ΔT, and ΔTr, to obtain a new target value of TA'(candidate cell).

[0098] Specifically, the difference between the above-mentioned ΔTr and ΔT is the deviation between the second time difference between the terminal receiving the first measured signal and the second measured signal and the first time difference between the transmission time of the first measured signal and the second measured signal. Based on the deviation, the time deviation of the uplink and downlink transmission of the measured signals on the two cells (the serving cell and the candidate cell) is determined. In this way, the current second timing advance TA' of the candidate cell is determined based on the current first timing advance TA of the serving cell and the time deviation.

[0099] In an embodiment of the present disclosure, optionally, when determining the first time difference △T and the second time difference △Tr, the same cell is used as the reference cell, such as the service cell is used as the reference cell. The first time difference △T is determined by taking the sending time of the second measured signal of the service cell as the reference time, calculating the difference between the sending time of the first measured signal of the candidate cell and the sending time of the second measured signal; the second time difference △Tr is determined by taking the receiving time of the second measured signal of the service cell as the reference time, calculating the difference between the receiving time of the first measured signal of the candidate cell and the receiving time of the second measured signal.

[0100] As shown in FIG2 , the uplink synchronization method according to the embodiment of the present disclosure may include the following implementation steps:

[0101] S201, the serving cell determines a first time difference ΔT between a candidate cell sending a first measured signal and a serving cell sending a second measured signal;

[0102] S202, the serving cell sends the first time difference ΔT to the terminal;

[0103] S203: The terminal measures a first measured signal and a second measured signal, obtains a time difference between a time when the terminal receives the first measured signal and a time when the terminal receives the second measured signal, that is, obtains a second time difference ΔTr, and calculates a time offset between the second time difference ΔTr and the first time difference ΔT (that is, calculates a value of ΔTr-ΔT);

[0104] S204: The terminal calculates a current second timing advance TA' of the candidate cell according to the current first timing advance TA of the serving cell and the time offset.

[0105] Optionally, the serving cell may determine the first time difference ΔT in real time or periodically and send the updated first time difference ΔT to the terminal, so that the terminal calculates the current second timing advance TA' of the candidate cell in real time and achieves uplink synchronization with the candidate cell when the switching condition is met.

[0106] With this implementation, the terminal can obtain the TA' value of the candidate cell without going through the RACH process with the candidate cell. Therefore, uplink synchronization through the RACH access process can be avoided, which avoids the problems of large delay and RACH resource conflict in the synchronization process, as well as the problem of low measurement accuracy due to measurement signal asynchrony, which cannot meet the precise TA alignment requirements in various scenarios.

[0107] In addition, by adopting the uplink synchronization method described in the embodiment of the present disclosure, after the terminal calculates and obtains the TA' of the candidate cell (target base station), it can achieve uplink synchronization with the target base station based on the calculated TA'. Unlike the switching scheme of the prior art, by adopting the method described in the embodiment of the present disclosure, the terminal can directly access the target base station, for example, receive the DCI message, RRC message, etc. of the target base station, and successfully switch to the target base station based on the received message.

[0108] One embodiment of the present disclosure further provides an uplink synchronization method, which is performed by a serving cell, as shown in FIG3 , and includes:

[0109] S310: Send a first time difference to the terminal, where the first time difference is a time difference between a sending time of a first measured signal of a candidate cell of the terminal and a sending time of a second measured signal of a serving cell.

[0110] By adopting the uplink synchronization method described in this embodiment, a first time difference between the first measured signal sent by the candidate cell of the terminal and the second measured signal sent by the serving cell is sent to the terminal, so that the terminal determines the second timing advance of the candidate cell based on the first time difference, the second time difference between the terminal receiving the measured signal and the reference signal, and the first timing advance of the serving cell, for performing uplink synchronization with the candidate cell. By adopting this method, uplink synchronization can be avoided through the RACH access process, and the problems of large delay and RACH resource conflict in the synchronization process can be avoided. In addition, by adopting this method, there is no need to perform signal measurement based on the terminal, so there is no problem of low measurement accuracy due to the asynchrony of the measurement signal, which cannot meet the precise TA alignment requirements of various scenarios.

[0111] Optionally, the uplink synchronization method further includes:

[0112] Obtaining the transmission time of the first measured signal of the candidate cell by one or more of the following methods:

[0113] The candidate cell transmits the data via an inter-station interface or a cell interface between the candidate cell and the candidate cell;

[0114] Network management equipment transmission.

[0115] Optionally, in the uplink synchronization method, the first time difference is the difference between the start time of the Nth frame of one sending period of the second measured signal and the start time of the Nth frame of the corresponding sending period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0116] Optionally, in the uplink synchronization method, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0117] For the specific implementation of the uplink synchronization method described in the embodiment of the present disclosure when applied to the serving cell, please refer to the detailed description of the specific implementation of the uplink synchronization method when applied to the terminal, which will not be repeated here.

[0118] One embodiment of the present disclosure further provides a terminal. As shown in FIG4 , the terminal 400 includes a processor 410, wherein the processor 410 is configured to:

[0119] Obtain a first time difference and a second time difference; wherein the first time difference is the time difference between the transmission time of the first measured signal of the candidate cell and the transmission time of the second measured signal of the serving cell, and the second time difference is the time difference between the time when the terminal receives the first measured signal and the time when the terminal receives the second measured signal;

[0120] determining a second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference;

[0121] Uplink synchronization with the candidate cell is performed according to the second timing advance.

[0122] Optionally, in the terminal, the processor 410 acquiring the first time difference includes:

[0123] Obtain the first time difference sent by the serving cell.

[0124] Optionally, in the terminal, the processor 410 acquiring the first time difference sent by the serving cell includes:

[0125] The first time difference is obtained, which is sent by the serving cell through radio resource control RRC signaling or media access control MAC element CE signaling.

[0126] Optionally, the terminal, wherein the first time difference is the difference between the start time of the Nth frame of one sending period of the second measured signal and the start time of the Nth frame of the corresponding sending period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0127] Optionally, in the terminal, the processor 410 determines the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference, including:

[0128] A second timing advance of the candidate cell is determined according to a difference between the second time difference and the first time difference and the first timing advance.

[0129] Optionally, in the terminal, the processor 410 determines the second timing advance of the candidate cell according to the difference between the first time difference and the second time difference and the first timing advance, including:

[0130] The second timing advance is determined according to the following formula: TA'=TA+2(ΔTr-ΔT);

[0131] TA' is the second timing advance, TA is the first timing advance, ΔTr is the second time difference, and ΔT is the first time difference.

[0132] Optionally, in the terminal, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0133] One embodiment of the present disclosure further provides a network device, wherein the network device is a network device corresponding to a serving cell. As shown in FIG5 , the network device 500 includes a transceiver 510, and the transceiver 510 is configured to:

[0134] A first time difference is sent to the terminal, where the first time difference is a time difference between a sending time of a first measured signal of a candidate cell of the terminal and a sending time of a second measured signal of a serving cell.

[0135] Optionally, in the network device, the transceiver 510 is further configured to:

[0136] Obtaining the transmission time of the first measured signal of the candidate cell by one or more of the following methods:

[0137] The candidate cell transmits the data via an inter-station interface or a cell interface between the candidate cell and the candidate cell;

[0138] Optionally, in the network device, the first time difference is a difference between a start time of an Nth frame of a transmission period of the second measured signal and a start time of an Nth frame of a corresponding transmission period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0139] Optionally, in the network device, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0140] One embodiment of the present disclosure further provides an uplink synchronization device, which is applied to a terminal. As shown in FIG6 , the device includes:

[0141] An acquisition module 610 is configured to acquire a first time difference and a second time difference; wherein the first time difference is a time difference between a transmission time of a first measured signal of a candidate cell and a transmission time of a second measured signal of a serving cell; and the second time difference is a time difference between a time when the terminal receives the first measured signal and a time when the terminal receives the second measured signal;

[0142] a determining module 620, configured to determine a second timing advance of the candidate cell based on the first timing advance of the serving cell, the first time difference, and the second time difference;

[0143] The synchronization module 630 is configured to perform uplink synchronization with the candidate cell according to the second timing advance.

[0144] Optionally, in the uplink synchronization device, the acquiring module 610 acquires the first time difference, including:

[0145] Obtain the first time difference sent by the serving cell.

[0146] Optionally, in the uplink synchronization device, the acquiring module 610 acquires the first time difference sent by the serving cell, including:

[0147] The first time difference is obtained, which is sent by the serving cell through radio resource control RRC signaling or media access control MAC element CE signaling.

[0148] Optionally, the uplink synchronization device, wherein the first time difference is the difference between the start time of the Nth frame of one sending period of the second measured signal and the start time of the Nth frame of the corresponding sending period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0149] Optionally, in the uplink synchronization device, the determining module 620 determines the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference, including:

[0150] A second timing advance of the candidate cell is determined according to a difference between the second time difference and the first time difference and the first timing advance.

[0151] Optionally, in the uplink synchronization device, the determining module 620 determines the second timing advance of the candidate cell according to the difference between the second time difference and the first time difference and the first timing advance, including: determining the second timing advance according to the following formula: TA'=TA+2(ΔTr-ΔT);

[0152] TA' is the second timing advance, TA is the first timing advance, ΔTr is the second time difference, and ΔT is the first time difference.

[0153] One embodiment of the present disclosure further provides an uplink synchronization device, which is applied to a serving cell. As shown in FIG7 , the device includes:

[0154] The sending module 710 is configured to send a first time difference to the terminal, where the first time difference is the time difference between the sending time of the first measured signal of the candidate cell of the terminal and the sending time of the second measured signal of the serving cell.

[0155] Optionally, the uplink synchronization device further comprises:

[0156] The time acquisition module 720 is configured to obtain the transmission time of the first measured signal of the candidate cell by one or more of the following methods:

[0157] The candidate cell transmits the data via an inter-station interface or a cell interface between the candidate cell and the candidate cell;

[0158] Optionally, in the uplink synchronization device, the first time difference is a difference between a start time of an Nth frame of a transmission period of the second measured signal and a start time of an Nth frame of a corresponding transmission period of the first measured signal; wherein N is an integer greater than or equal to 1.

[0159] Optionally, in the uplink synchronization device, the first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

[0160] One embodiment of the present disclosure further provides a terminal, which includes a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the uplink synchronization method as described in any one of the above items.

[0161] The specific implementation of the uplink synchronization method executed by the program running on the processor of the network device can refer to the detailed description of the uplink synchronization method when it is applied to the terminal, and will not be repeated here.

[0162] One embodiment of the present disclosure further provides a network device, which includes a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the uplink synchronization method as described in any one of the above items.

[0163] The specific implementation method of executing the uplink synchronization method by the program running on the processor of the network device can refer to the detailed description of the uplink synchronization method when it is applied to the serving cell, and will not be repeated here.

[0164] In addition, a specific embodiment of the present disclosure further provides a readable storage medium having a computer program stored thereon, wherein the program, when executed by a processor, implements the steps in the uplink synchronization method as described in any one of the above items.

[0165] Specifically, the readable storage medium is applied to the above-mentioned terminal or serving cell. When applied to the terminal or serving cell, the execution steps in the corresponding uplink synchronization method are as described in detail above and will not be repeated here.

[0166] In the several embodiments provided in the present disclosure, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection of some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0167] In addition, the functional units in the various embodiments of the present disclosure may be integrated into a single processing unit, each unit may be physically included 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 hardware plus software functional units.

[0168] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium and includes a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute some steps of the sending and receiving methods described in various embodiments of the present disclosure. The aforementioned storage medium includes: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk, etc., various media that can store program code.

[0169] The above is a preferred embodiment of the present disclosure. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles described in the present disclosure. These improvements and modifications should also be regarded as within the scope of protection of the present disclosure.

Claims

1. An uplink synchronization method, which is executed by a terminal, and the method includes: Obtaining a first time difference and a second time difference; wherein, the first time difference is the time difference between the transmission time of a first measured signal of a candidate cell and the transmission time of a second measured signal of a serving cell, and the second time difference is the time difference between the time when the terminal receives the first measured signal and the time when it receives the second measured signal; Determining a second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference; Performing uplink synchronization with the candidate cell according to the second timing advance.

2. The uplink synchronization method according to claim 1, wherein, Obtaining the first time difference includes: Obtaining the first time difference sent by the serving cell.

3. The uplink synchronization method according to claim 2, wherein The obtaining the first time difference sent by the serving cell includes: Obtaining the first time difference sent by the serving cell through radio resource control (RRC) signaling or medium access control (MAC) control element (CE) signaling.

4. The uplink synchronization method according to claim 1, wherein, The first time difference is the difference between the start time of the Nth frame of one transmission period of the second measured signal and the start time of the Nth frame of the corresponding transmission period of the first measured signal; wherein, N is an integer greater than or equal to 1.

5. The uplink synchronization method according to claim 1, wherein Determining the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference includes: Determining the second timing advance of the candidate cell according to the difference between the second time difference and the first time difference and the first timing advance.

6. The uplink synchronization method according to claim 5, wherein, Determining the second timing advance of the candidate cell according to the difference between the first time difference and the second time difference and the first timing advance includes: Determining the second timing advance according to the following formula: TA’ = TA + 2(△Tr - △T); wherein, TA’ is the second timing advance, TA is the first timing advance, △Tr is the second time difference, and △T is the first time difference.

7. The uplink synchronization method according to claim 1, wherein, The first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

8. An uplink synchronization method, which is executed by a serving cell, and the method includes: Sending a first time difference to a terminal, wherein the first time difference is the time difference between the transmission time of a first measured signal of a candidate cell of the terminal and the transmission time of a second measured signal of the serving cell.

9. The uplink synchronization method according to claim 8 further includes: Obtaining the transmission time of the first measured signal of the candidate cell through one or more of the following methods: Transmitted by the candidate cell through an inter-station interface or a cell interface with the candidate cell; Transmitted by a network management device.

10. The uplink synchronization method according to claim 8 or 9, wherein, The first time difference is the difference between the start time of the Nth frame of one transmission period of the second measured signal and the start time of the Nth frame of the corresponding transmission period of the first measured signal; wherein, N is an integer greater than or equal to 1.

11. The uplink synchronization method according to claim 8 or 9, wherein, The first measured signal and the second measured signal respectively include a reference signal and / or a synchronization signal.

12. A terminal, comprising a processor, wherein the processor is configured to: Obtain a first time difference and a second time difference; wherein, The first time difference is the time difference between the transmission time of the first measured signal of the candidate cell and the transmission time of the second measured signal of the serving cell, and the second time difference is the time difference between the time when the terminal receives the first measured signal and the time when the terminal receives the second measured signal; Determine the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference; Perform uplink synchronization with the candidate cell according to the second timing advance.

13. A network device, wherein the network device is the network device corresponding to the serving cell, comprising a transceiver, configured to: Send a first time difference to the terminal, where The first time difference is the time difference between the transmission time of the first measured signal of the candidate cell of the terminal and the transmission time of the second measured signal of the serving cell.

14. An uplink synchronization apparatus, applied to a terminal, the apparatus comprising: An acquisition module, configured to acquire a first time difference and a second time difference; wherein, the first time difference is the time difference between the transmission time of the first measured signal of the candidate cell and the transmission time of the second measured signal of the serving cell, and the second time difference is the time difference between the time when the terminal receives the first measured signal and the time when the terminal receives the second measured signal; A determination module, configured to determine the second timing advance of the candidate cell according to the first timing advance of the serving cell, the first time difference, and the second time difference; A synchronization module, configured to perform uplink synchronization with the candidate cell according to the second timing advance.

15. An uplink synchronization apparatus, applied to a serving cell, the apparatus comprising: A sending module, configured to send a first time difference to a terminal, wherein the first time difference is the time difference between the transmission time of the first measured signal of the candidate cell of the terminal and the transmission time of the second measured signal of the serving cell.

16. A terminal, comprising a processor, a memory, and a program stored on the memory and executable on the processor, wherein when the program is executed by the processor, the uplink synchronization method according to any one of claims 1 to 7 is implemented.

17. A network device, comprising a processor, a memory, and a program stored on the memory and executable on the processor, wherein when the program is executed by the processor, the uplink synchronization method according to any one of claims 8 to 11 is implemented.

18. A readable storage medium, having a program stored thereon, wherein when the program is executed by a processor, the steps in the uplink synchronization method according to any one of claims 1 to 7 are implemented, or the steps in the uplink synchronization method according to any one of claims 8 to 11 are implemented.

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