Method, device, equipment and storage medium for determining uplink advance timing

Abstract

The embodiment of the present application discloses a method, device, equipment and storage medium for determining an uplink timing advance TA, and relates to the field of wireless communication technology. The method comprises: determining a first TA according to a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate the offset of the round-trip delay of signal propagation between a terminal and a serving cell base station, and the TA estimate value is the round-trip delay of signal propagation between a terminal and a serving cell satellite estimated by the terminal based on the positioning capability. The embodiment of the present application introduces a TA offset value in the process of determining the uplink TA by the terminal, thereby avoiding the situation where the terminal over-compensates the TA due to the error in positioning accuracy, and therefore, does not interfere with the uplink signal of the previous symbol received or the downlink signal sent by the network side, thereby ensuring the signal reception performance on the network side.

Description

Technical Field

[0001] The present application relates to the field of wireless communication technology, and in particular to a method, device, equipment and storage medium for determining uplink timing advance (TA). Background Art

[0002] In the NR (New Radio) system, in order to ensure the orthogonality of uplink transmission and avoid interference between uplink transmissions from different terminals in the same cell, the NR system supports the mechanism of uplink timing advance, that is, aligning the time when uplink transmissions from terminals in the same time slot but different frequency domain resources arrive at the network side. In the traditional NR terrestrial cellular network, TA compensation will not be performed when the terminal sends uplink messages during random access and sends uplink transmissions in the RRC (Radio Resource Control) connection state.

[0003] In NTN (Non Terrestrial Network), a mechanism is introduced in which the terminal compensates the TA for sending uplink messages and uplink transmissions. The terminal can directly use the TA estimated based on its positioning capability to send uplink messages and uplink transmissions.

[0004] However, due to the error in positioning accuracy, the TA estimated by the terminal may be greater than or less than the actual TA of the terminal. When the TA estimated by the terminal is too large, the uplink message or uplink transmission sent by the terminal will arrive at the network side earlier, thereby interfering with the uplink signal reception or downlink signal sending of the previous symbol on the network side, affecting the receiving performance on the network side. Summary of the invention

[0005] The embodiments of the present application provide a method, device, equipment and storage medium for determining an uplink TA, which can effectively prevent the terminal from overcompensating the TA, thereby not interfering with the uplink signal of the previous symbol received by the network side or the downlink signal sent, thereby ensuring the signal reception performance of the network side. The technical solution is as follows:

[0006] On the one hand, a method for determining an uplink timing advance TA is provided, which is applied in a terminal, and the method includes:

[0007] A first TA is determined according to a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate an offset of a round-trip delay of signal propagation between the terminal and a serving cell base station, and the TA estimate value is a round-trip delay of signal propagation between the terminal and a serving cell satellite estimated by the terminal based on positioning capability.

[0008] On the other hand, a method for determining an uplink timing advance TA is provided, which is applied to a serving cell base station, and the method includes:

[0009] A TA offset value is sent to the terminal, where the TA offset value is used to instruct the terminal to determine a first TA according to the TA offset value.

[0010] On the other hand, a device for determining an uplink timing advance TA is provided, the device comprising:

[0011] A determination module is used to determine a first TA based on a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate the offset of the round-trip delay of signal propagation between the terminal and the serving cell base station, and the TA estimate value is the round-trip delay of signal propagation between the terminal and the serving cell satellite estimated by the terminal based on the positioning capability.

[0012] On the other hand, a device for determining an uplink timing advance TA is provided, the device comprising:

[0013] The sending module is used to send a TA offset value to the terminal, where the TA offset value is used to instruct the terminal to determine a first TA according to the TA offset value.

[0014] On the other hand, a terminal is provided, the terminal device comprising a processor and a memory, the memory storing at least one instruction, the at least one instruction being used to be executed by the processor to implement the method for determining the uplink TA described in any one of the above aspects.

[0015] On the other hand, a network device is provided, which may be a serving cell base station, the network device comprising a processor and a memory, the memory storing at least one instruction, the at least one instruction being used to be executed by the processor to implement the method for determining the uplink TA described in any of the above aspects.

[0016] On the other hand, a computer-readable storage medium is provided, on which instructions are stored, and when the instructions are executed by a processor, the method for determining the uplink TA described in any one of the above aspects is implemented.

[0017] On the other hand, a computer program product including instructions is provided, which, when executed on a computer, enables the computer to execute the method for determining an uplink TA as described in any one of the above aspects.

[0018] The beneficial effects brought by the technical solution provided by the embodiment of the present application include at least:

[0019] Introducing the TA offset value during the process of the terminal determining the uplink TA avoids the situation where the terminal over-compensates the TA due to positioning accuracy errors. Therefore, it does not interfere with the network side receiving the uplink signal of the previous symbol or sending the downlink signal, thereby ensuring the signal reception performance on the network side. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 is a schematic diagram of an NTN scenario based on transparent transmission load provided by an exemplary embodiment of the present application;

[0022] Figure 2 is a schematic diagram of an NTN scenario based on regenerative load provided by an exemplary embodiment of the present application;

[0023] Figure 3 is a schematic diagram of timing advance provided by an exemplary embodiment of the present application;

[0024] Figure 4 is a flowchart of a random access process provided by an exemplary embodiment of the present application;

[0025] Figure 5 is a schematic diagram of a round trip delay of signal propagation provided by an exemplary embodiment of the present application;

[0026] Figure 6 is a schematic diagram of timing advance adjustment provided by an exemplary embodiment of the present application;

[0027] Figure 7 is a flow chart of a method for determining an uplink TA provided by an exemplary embodiment of the present application;

[0028] Figure 8 is a flow chart of a communication method based on a first TA provided by an exemplary embodiment of the present application;

[0029] Fig. 9 is a schematic diagram of adjusting the first TA based on a four-step random access process provided by an exemplary embodiment of the present application;

[0030] Fig.10 is a schematic diagram of adjusting the first TA based on a two-step random access process provided by an exemplary embodiment of the present application;

[0031] Fig.11is a flowchart of a communication method based on a first TA provided by another exemplary embodiment of the present application;

[0032] Fig.12 is a structural diagram of an uplink TA determination device provided by an exemplary embodiment of the present application;

[0033] Fig.13 is a structural diagram of an uplink TA determination device provided by another exemplary embodiment of the present application;

[0034] Fig.14 It is a structural diagram of a communication device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0035] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0036] Before introducing in detail the method for determining the uplink TA provided in the embodiment of the present application, a brief introduction is first given to the relevant terms and implementation environment involved in the embodiment of the present application.

[0037] First, the relevant terms involved in this application are briefly introduced.

[0038] 1. NTN

[0039] At present, 3GPP (Third Generation Partnership Project) is studying NTN technology, which generally uses satellite communication to provide communication services to ground users. Compared with ground cellular network communication, satellite communication has many unique advantages. First, satellite communication is not limited by the user's geographical location. For example, general land communication cannot cover areas such as oceans, mountains, deserts, etc. where communication equipment cannot be set up or where communication coverage is not provided due to sparse population. For satellite communication, since one satellite can cover a large area of ​​land, and satellites can orbit the earth, in theory every corner of the earth can be covered by satellite communication. Secondly, satellite communication has great social value. Satellite communication can cover remote mountainous areas, poor and backward countries or regions at a low cost, so that people in these areas can enjoy advanced voice communication and mobile Internet technology, which is conducive to narrowing the digital divide with developed areas and promoting the development of these areas. Thirdly, satellite communication has a long distance, and the cost of communication does not increase significantly as the communication distance increases; finally, satellite communication has high stability and is not restricted by natural disasters.

[0040] According to the different orbital altitudes, communication satellites are divided into LEO (Low-Earth Orbit) satellites, MEO (Medium-Earth Orbit) satellites, GEO (Geostationary Earth Orbit) satellites, HEO (High Elliptical Orbit) satellites, etc. At present, the main research is on LEO and GEO.

[0041] (1)LEO

[0042] The altitude of low-orbit satellites ranges from 500km to 1500km, and the corresponding orbital period is about 1.5 hours to 2 hours. The signal propagation delay of single-hop communication between users is generally less than 20ms. The maximum satellite visibility time is 20 minutes. The signal propagation distance is short, the link loss is small, and the transmission power requirement for user terminals is not high.

[0043] (2)GEO

[0044] The geosynchronous orbit satellite has an orbit altitude of 35786km and a rotation period around the earth of 24 hours. The signal propagation delay of single-hop communication between users is generally 250ms.

[0045] In order to ensure satellite coverage and improve the system capacity of the entire satellite communication system, satellites use multiple beams to cover the ground. A satellite can form dozens or even hundreds of beams to cover the ground; a satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

[0046] Currently, there are at least two NTN scenarios: an NTN scenario based on transparent load and an NTN scenario based on regeneration load. Figure 1 A schematic diagram of an NTN scenario based on transparent transmission load is shown. Figure 2 A schematic diagram of a NTN scenario based on regenerative load is shown.

[0047] The NTN network consists of the following network elements:

[0048] One or more gateways to connect satellite and terrestrial public networks.

[0049] Feeder Link: Link used for communication between the gateway and the satellite

[0050] Service Link: The link used for communication between the terminal and the satellite

[0051] Satellite: Based on the functions it provides, it can be divided into two types: transparent forwarding and regenerative forwarding.

[0052] Transparent transmission payload: only provides the functions of wireless frequency filtering, frequency conversion and amplification. It only provides transparent forwarding of signals and does not change the waveform signal forwarded.

[0053] Regenerative load: In addition to providing wireless frequency filtering, frequency conversion and amplification functions, it can also provide demodulation / decoding, routing / conversion, encoding / modulation functions. It has some or all of the functions of a base station.

[0054] ISL (Inter-satellite links): exists in the NTN scenario of regeneration and forwarding.

[0055] 2. Upload in advance

[0056] An important feature of uplink transmission is orthogonal multiple access of different terminals in time and frequency, that is, uplink transmissions from different terminals in the same cell do not interfere with each other.

[0057] In order to ensure the orthogonality of uplink transmission and avoid interference between uplink transmissions from different terminals in the same cell, network equipment (such as base stations) requires that the time at which uplink transmissions from terminals in the same time slot but different frequency domain resources arrive at the network equipment is basically aligned. Since the network equipment can correctly decode the uplink transmission sent by the terminal as long as it receives it within the CP (Cyclic Prefix) range, the network equipment requires that the time at which uplink transmissions from terminals in the same time slot but different frequency domain resources arrive at the network equipment falls within the CP.

[0058] In order to ensure the time synchronization of network devices, NR supports the mechanism of uplink timing advance. For the terminal, TA is essentially a time slot offset value between receiving the downlink transmission and sending the uplink transmission. By properly controlling the TA time slot offset value of each terminal, the network device can control the time when the uplink transmission from different terminals arrives at the network device. For terminals far away from the network device, due to the larger round-trip delay of signal propagation, the uplink transmission must be sent earlier than the terminal closer to the network device.

[0059] Figure 3 A schematic diagram of timing advance is shown, such as Figure 3 As shown in (a) in FIG, when the terminal does not advance the uplink timing, the uplink transmission from the terminal in the same time slot but different frequency domain resources arrives at the network device at a different time. Figure 3 As shown in (b), when the terminal performs uplink timing advance, the time when the uplink transmission of the terminal from the same time slot but different frequency domain resources arrives at the network device is basically aligned.

[0060] It should be noted that Figure 3From (b), it can be seen that the uplink clock and downlink clock of the network device are aligned, while there is an offset between the uplink clock and downlink clock of the terminal, and the timing advance of different terminals may be different.

[0061] Exemplarily, the network device may determine the TA value of the terminal by measuring the uplink transmission of the terminal. Furthermore, the network device sends a TA command to the terminal in the following two ways.

[0062] The first type: Acquisition of the initial TA

[0063] During the random access process, the network device can determine the TA value of the terminal by measuring the received preamble code, and send it to the terminal through the TAC (Timing Advance Command) field in the RAR (Random Access Response).

[0064] Second: Adjustment of TA in RRC connected state

[0065] Although the terminal and the network device have achieved uplink synchronization during the random access process, the time for the uplink transmission to reach the network device may change. For example, for a terminal moving at high speed, the round-trip delay of the signal propagation between it and the network device will continue to change. Therefore, the terminal needs to continuously update its TA value to maintain uplink synchronization with the network device.

[0066] As an example, the network device can use a closed-loop mechanism to adjust the TA value. That is, the network device can determine the TA value of the terminal by measuring the uplink transmission of the terminal. Therefore, as long as the terminal has uplink transmission, the network device can be used to estimate the TA value. In theory, any signal sent by the terminal can be used by the network device to measure the TA value, for example, the SRS (Sounding Reference Signal), DMRS (Demodulation Reference Signal), CQI (Channel Quality Indication), ACK (Acknowledgment) / NACK (Non-Acknowledgment), PUSCH (Physical Uplink Control Channel), etc. sent by the terminal can all be used by the network device to measure the TA value.

[0067] If the TA value of a terminal needs to be corrected, the network device will send a TAC to the terminal, requiring the terminal to adjust the TA value. The TAC may be sent to the terminal via a MAC (Media Access Control) CE (Control Element).

[0068] 3. Random access process

[0069] Please refer to Figure 4 , the random access process can generally include the following four steps.

[0070] Step 1: The terminal sends Msg1 to the network device, where Msg1 is a random access preamble sequence (i.e., a preamble code).

[0071] The terminal sends Msg1 to the network device to notify the network device of a random access request, and enables the network device to estimate the transmission delay between itself and the terminal and calibrate the uplink time accordingly.

[0072] As an example, the information of the resources for sending Msg1 can be obtained through the resource configuration of RACH (Random Access Channel). In Rel-15 NR technology, RACH resource configuration information configured for terminal access is defined, including 256 types. The cell can indicate the RACH resource configuration information used by itself to the terminal in the system message. Each type of RACH resource configuration information includes the preamble format, period, radio frame offset, subframe number in the radio frame, start symbol in the subframe, number of PRACH time slots in the subframe, number of PRACH opportunities in the PRACH time slot, and duration of PRACH opportunities. The time, frequency, and code information of the PRACH resource can be determined through this information. In this way, the terminal can send Msg1 on the corresponding PRACH resource according to the RACH resource configuration information indicated by the network device.

[0073] Step 2: After the network device detects Msg1 sent by the terminal, it sends RAR (Msg2) to the terminal to inform the terminal of the uplink resource information that can be used when sending the next message (Msg3).

[0074] Among them, one RAR may include response messages to multiple terminals that send preamble codes, and the response message to each terminal includes the random access preamble code identification field RAP ID used by each terminal, resource allocation information of Msg3, TA information, etc.

[0075] Of course, in addition to this, the network device can also perform other operations, such as allocating a temporary RNTI (Radio Network Temporary Identity) to the terminal, etc., which will not be introduced in detail here.

[0076] Step 3: The terminal receives the RAR and sends Msg3 to the network device on the uplink resource indicated by the RAR.

[0077] In some embodiments, the terminal may monitor PDCCH (Physical Downlink Control Channel) in a search space within a RAR time window corresponding to the RAR to receive the RAR. The RAR time window may be configured by a high-level parameter, and configuration information of the search space of the PDCCH may be indicated by a system message.

[0078] If the terminal does not receive the RAR sent by the network device within the RAR time window, it is considered that the random access process has failed. If the terminal receives a RAR, and the preamble index in the RAR is the same as the preamble index sent by the terminal, it is considered that the RAR has been successfully received. At this time, the terminal can stop monitoring the RAR and send Msg3 to the network device.

[0079] As an example, the Msg3 may carry a terminal-specific temporary identification information or a terminal identifier from the core network. For example, the terminal identifier may be an S-TMSI (Serving-Temporary Mobile Subscriber Identity) or a random number.

[0080] Step 4: After receiving Msg3, the network device sends Msg4 to the terminal.

[0081] As an example, the Msg4 includes a contention resolution message and information about uplink transmission resources allocated to the terminal. Exemplarily, in the conflict resolution mechanism, the network device carries a unique flag in Msg4 to indicate the terminal that has won the contention. When the terminal receives Msg4 sent by the base station, it detects whether the temporary identification information sent by the terminal in Msg3 is included in the contention resolution message sent by the network device. If included, it indicates that the random access process of the terminal is successful. Otherwise, it is considered that the random access process has failed, and the terminal needs to initiate the random access process again from the first step.

[0082] 4. Determination of initial TA in NTN

[0083] In NTN, all terminals have positioning capabilities, and NTN will support two types of terminals. One is a terminal without initial TA compensation capability, that is, the terminal does not perform TA compensation when sending Msg1 during random access. The other is a terminal with initial TA compensation capability, that is, the terminal uses its own estimated TA to send Msg1 during random access.

[0084] For these two types of terminals, the methods for determining TA are different.

[0085] First, for terminals that do not have the ability to compensate for the initial TA, the network device will broadcast a public TA based on the round-trip delay of the signal propagation between the ground reference point and the satellite. When the terminal sends Msg1, it uses the public TA broadcast by the network for TA compensation. Then the network device indicates a dedicated TA value to the terminal in the RAR, so that the terminal can accumulate the broadcast public TA and the dedicated TA indicated to the terminal in the RAR to obtain the TA used when sending Msg3.

[0086] Among them, the method for determining the public TA is as follows: Figure 5 As shown, for the NTN scenario of regenerative load, Figure 5 As shown in (a), the common TA = 2*d0 / c, where d0 refers to the distance between the ground reference point and the satellite, and c refers to the speed of light.

[0087] For NTN scenarios with transparent transmission load, such as Figure 5 As shown in (b), TA = 2*(d0+d0_F) / c, where d0 refers to the distance between the ground reference point and the satellite, c refers to the speed of light, and d0_F refers to the distance between the satellite and the ground base station.

[0088] Secondly, for a terminal with initial TA compensation capability, its random access process is as follows: Figure 6 shown.

[0089] Specifically, the terminal estimates its own TA based on its own positioning capability, and uses the estimated TA to send Msg1.

[0090] After receiving Msg1, the network device determines the TA adjustment value of the terminal and indicates it to the terminal through Msg2. Since the network device does not know the actual round-trip delay of signal propagation between the terminal and the network device, the network device can schedule the resources of Msg3 of the terminal according to the maximum uplink scheduling delay.

[0091] Then, the terminal adjusts the TA based on the instruction of the received RAR, and sends Msg3 on the uplink resources scheduled by the network device.

[0092] Furthermore, after receiving Msg3 from the terminal, the network device can determine the actual round-trip delay of signal propagation between the terminal and the network device.

[0093] It should be noted that, during the random access process, regardless of whether the terminal has the initial TA compensation capability, the RAR sent by the network device will include a UL grant field for indicating the uplink resource of Msg3. The terminal sends Msg3 on the PUSCH resource indicated by the UL grant of the RAR.

[0094] Next, the implementation environment involved in the embodiments of the present application is briefly introduced.

[0095] In the traditional NR terrestrial cellular network, when the terminal sends the preamble code preamble during the random access process, it will not estimate the TA and compensate for the TA by itself. In NTN, due to the introduction of a mechanism for the terminal to compensate for the TA when sending the preamble, if the terminal directly uses the TA estimated based on its positioning capability to send the preamble, due to the error in positioning accuracy, the TA estimated by the terminal may be greater or less than the actual TA of the terminal. If the TA estimated by the terminal is too large, the preamble sent by the terminal will reach the network side earlier, thereby interfering with the uplink signal reception or downlink signal transmission of the previous symbol on the network side, affecting the receiving performance on the network side.

[0096] Similarly, in the NR system, the TA of the terminal is completely determined and controlled by the network side. In NTN, for a terminal in the RRC connected state, if the terminal compensates for the TA by itself, when the TA estimated by the terminal is too large, the uplink transmission of the terminal will reach the network side earlier, thereby interfering with the uplink signal reception or downlink signal transmission of the previous symbol on the network side, affecting the receiving performance on the network side.

[0097] Therefore, based on the above two situations, the present application proposes an embodiment in which a TA offset value is introduced to prevent the terminal from over-compensating the TA so that the signal sent by the terminal interferes with the signal of the previous symbol.

[0098] After introducing the relevant terms and implementation environment involved in the embodiments of the present application, the method for determining the uplink TA provided in the embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0099] Figure 7 is a flowchart of a method for determining an uplink TA according to an exemplary embodiment of the present application, which can be applied to the above Figure 1 or Figure 2 For a terminal in the NTN scenario shown, the method for determining the uplink TA may include at least part of the following contents:

[0100] Step 710: Determine a first TA based on a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate an offset of a round-trip delay of signal propagation between a terminal and a serving cell base station, and the TA estimate value is a round-trip delay of signal propagation between a terminal and a serving cell satellite estimated by the terminal based on positioning capability.

[0101] The TA offset value is any of the following:

[0102] (1) Common TA offset value

[0103] The common TA offset value is a TA offset value configured by the serving cell base station for the terminal in the serving cell according to the first positioning capability, and the first positioning capability is the positioning capability of at least one terminal in the serving cell.

[0104] As an example, the serving cell base station may determine the common TA offset value of the serving cell based on the positioning capability of any terminal in the serving cell. Afterwards, all terminals in the serving cell use the common TA offset value when determining the first TA. Alternatively, the serving cell base station may determine the common TA offset value of the serving cell based on the positioning capability of a terminal with the lowest positioning capability in the serving cell.

[0105] As another example, the serving cell base station determines an average value of the positioning capabilities based on the positioning capabilities of multiple terminals in the serving cell, and determines a common TA offset value of the serving cell according to the average value. Afterwards, all terminals in the serving cell use the common TA offset value when determining the first TA.

[0106] It should be noted that the serving cell base station is configured with a common TA offset value for all cells within its coverage area. The common TA offset values ​​configured for different cells may be the same or different, and this embodiment of the application does not limit this.

[0107] In a possible implementation, the TA offset value is sent to the terminal by the serving cell base station in a broadcast form. That is, the terminal in the serving cell obtains the common TA offset value through the cell broadcast, and the TA offset value used by each terminal in the serving cell when determining the first TA can be the above-mentioned common TA offset value.

[0108] (2) Predefined TA offset value

[0109] The predefined TA offset value is a TA offset value pre-defined based on a second positioning capability, and the second positioning capability is a positioning capability of at least one terminal.

[0110] For terminals with different positioning capabilities, the predefined TA offset values ​​may be the same or different. The TA offset value is determined based on the positioning capability of at least one terminal.

[0111] As an example, a TA offset value common to all terminals may be predefined based on the positioning capability of a certain terminal or the positioning capability of a terminal with the lowest positioning capability. That is, the TA offset value predefined by each terminal is the same.

[0112] As another example, different TA offset values ​​may be defined for terminals with different positioning capabilities according to different positioning capabilities corresponding to the multiple terminals, that is, the pre-defined TA offset value corresponding to at least one terminal with the same positioning capability is the same.

[0113] (3) Proprietary TA offset value.

[0114] The dedicated TA offset value is a TA offset value configured by the serving cell base station for the terminal according to the third positioning capability, and the third positioning capability is the positioning capability of the terminal. For each terminal, the serving cell base station configures the TA offset value most suitable for the terminal.

[0115] In one possible implementation, the terminal reports its own positioning capability when sending a preamble code during the random access process. The serving cell base station determines the offset of the round-trip delay of signal propagation between the terminal and itself based on the positioning capability, and then determines the terminal-specific TA offset value.

[0116] In another possible implementation manner, the serving cell base station may determine the positioning capability of the terminal by measuring any uplink transmission of the terminal, and determine the terminal-specific TA offset value based on the positioning capability.

[0117] It should be understood that the above content is for illustration purposes only and is not intended to be limiting. It is merely to explain that the serving cell base station can configure a terminal-specific TA offset value for a terminal with different positioning capabilities.

[0118] In addition, based on the TA offset value shown above, the serving cell base station can also adjust the TA offset value at any time and inform the terminal of the adjusted TA offset value.

[0119] It should be noted that the above-mentioned proprietary TA offset value can send the determined TA offset value to the terminal through the TAC field in the RAR during the random access process; it can also send TAC to the terminal through the MAC CE in the RRC connection state to inform the terminal of the determined TA offset value; it may also be informed to the terminal through other proprietary signaling, broadcasting, etc., and the embodiments of the present application are not limited to this.

[0120] The TA estimated value is estimated by the terminal according to the current location of the terminal and the first ephemeris information, and the first ephemeris information is the ephemeris information of the serving cell satellite.

[0121] Usually, the ephemeris information includes information such as the satellite's orbit and speed, and the satellite's position at any moment can be determined based on the ephemeris information.

[0122] It should be noted that the terminal has a positioning capability and can determine its own location. In addition, after the terminal establishes a connection with the serving cell base station through the serving cell satellite, the terminal can store the first ephemeris information of the serving cell satellite.

[0123] In one possible implementation, the process of estimating the TA estimate value according to the current position of the terminal and the first ephemeris information is as follows: the terminal determines the position of the service cell satellite according to the first ephemeris information, and further determines the first distance between the service cell satellite and its own position, and uses the ratio between the first distance and the signal transmission rate as the signal propagation delay between the terminal and the service cell satellite.

[0124] For the terminal, TA is essentially a time slot offset between receiving a downlink transmission and sending an uplink transmission. Therefore, the TA estimate should reflect the round-trip delay of the signal propagation between the terminal and the serving cell satellite.

[0125] For example, the TA estimate value can be determined by the following formula (1).

[0126]

[0127] Among them, TA_SL is the round-trip delay of signal propagation between the terminal and the serving cell satellite on the serving link, d1 is the first distance between the serving cell satellite and the current position of the terminal, and v is the signal transmission rate.

[0128] As an example, v can also be replaced by the speed of light c.

[0129] Based on the above Figure 7 In an embodiment, the first TA is determined according to the TA offset value and the TA estimated value, including the following methods:

[0130] Method 1: In an NTN scenario based on regeneration load, a first difference between a TA estimation value and a TA offset value is determined, and the first difference is used as a first TA.

[0131] For example, the first TA can be determined by the following formula (2).

[0132] TA1=TA_SL-TA_offset (2)

[0133] Among them, TA1 is the first TA, TA_SL is the round-trip delay of signal propagation between the terminal and the service cell satellite on the service link, and TA_offset is the TA offset value.

[0134] Method 2: In an NTN scenario based on transparent transmission load, when the terminal can obtain the second TA on the feeder link between the serving cell satellite and the serving cell base station, the first TA is determined according to the TA estimation value, the TA offset value and the second TA.

[0135] In a possible implementation, the implementation process of determining the first TA is: determining a third TA according to the TA estimation value and the second TA, the third TA being a signal propagation round trip delay between the terminal and the serving cell base station estimated by the terminal based on the positioning capability, and then determining a second difference between the third TA and the TA offset value, and using the second difference as the first TA.

[0136] For example, the first TA can be determined by the following formula (3).

[0137] TA1=TA_SL+TA2-TA_offset (3)

[0138] Among them, TA1 is the first TA, TA_SL is the round-trip delay of signal propagation between the terminal and the service cell satellite on the service link, TA2 is the round-trip delay of signal propagation between the service cell satellite and the service cell base station on the feeder link, TA_SL+TA2 represents the above-mentioned third TA, and TA_offset is the TA offset value.

[0139] Similarly, the terminal determines the position of the serving cell satellite according to the first ephemeris information, and further determines the second distance between the serving cell satellite and the serving cell base station. The ratio between the second distance and the signal transmission rate is the signal transmission delay between the serving cell base station and the serving cell satellite.

[0140] For example, TA2 can be determined by the following formula (4).

[0141]

[0142] Among them, TA_FL is the round-trip delay of signal propagation between the serving cell base station and the serving cell satellite on the feeder link, which is the above-mentioned TA2, d2 is the second distance between the serving cell satellite and the serving cell base station, and v is the signal transmission rate.

[0143] As an example, v can also be replaced by the speed of light c.

[0144] Method 3: In the NTN scenario based on transparent transmission load, if the terminal cannot obtain the second TA on the feeder link between the serving cell satellite and the serving cell base station, a first difference between the TA estimate and the TA offset value is determined, and the first difference is used as the first TA.

[0145] For example, the first TA can be determined by the above formula (2).

[0146] To sum up, in an embodiment of the present application, a TA offset value is introduced in the process of the terminal determining the uplink TA, thereby avoiding the situation where the terminal over-compensates the TA due to an error in positioning accuracy. Therefore, it will not interfere with the network side receiving the uplink signal of the previous symbol or sending the downlink signal, thereby ensuring the signal reception performance on the network side.

[0147] Based on the above Figure 7 In the illustrated embodiment, after determining the first TA, the terminal can communicate with the serving cell base station using the first TA.

[0148] As an example, see Figure 8 , Figure 8 This is a flowchart of an uplink communication method based on a first TA according to an exemplary embodiment of the present application. The method can be applied in an NTN scenario. The uplink communication method may include at least part of the following contents:

[0149] Step 810: The terminal determines a first TA according to the TA offset value and the TA estimation value.

[0150] Among them, the TA offset value is used to indicate the offset of the round-trip delay of signal propagation between the terminal and the serving cell base station, and the TA estimate value is the round-trip delay of signal propagation between the terminal and the serving cell satellite estimated by the terminal based on the positioning capability.

[0151] The above-mentioned TA offset value may be a predefined TA offset value, or may be a public TA offset value or a dedicated TA offset value sent by the serving cell base station to the terminal, and the embodiment of the present application does not limit this.

[0152] Step 820: The terminal uses the first TA to send an uplink message to the serving cell base station, where the uplink message includes the first message Msg1 or MsgA in the random access process.

[0153] Step 830: The serving cell base station receives an uplink message sent by the terminal using the first TA.

[0154] Next, in conjunction with the drawings of the embodiments of the present application, the above steps 820, 830 and the subsequent random access process are further explained.

[0155] In the four-step random access scenario, the terminal uses the first TA to send Msg1 to the serving cell base station, and the process of adjusting the first TA is as follows: Fig. 9 shown.

[0156] After the terminal determines the first TA according to the TA offset value and the TA estimation value, it uses the first TA to send Msg1 to the serving cell base station to notify the serving cell base station of a random access request, and at the same time enables the serving cell base station to estimate the transmission delay between the base station and the terminal, and use it to calibrate the first TA.

[0157] After receiving Msg1 sent by the terminal, the serving cell base station sends a RAR (Msg2) to the terminal to inform the terminal of uplink resource information that can be used when sending the next message (Msg3), and at the same time, carries the adjustment amount of the first TA in the RAR.

[0158] It should be noted that if the time when the uplink transmissions from the terminals in the same time slot but different frequency domain resources arrive at the serving cell base station is basically aligned, the adjustment amount of the first TA can be 0. If there is a deviation in the time when the uplink transmissions from the terminals in the same time slot but different frequency domain resources arrive at the serving cell base station, the adjustment amount of the first TA is notified to the terminal in Msg2.

[0159] The terminal receives the RAR, and uses the adjusted uplink TA to send Msg3 to the serving cell base station on the uplink resources indicated by the RAR.

[0160] It should be noted that when the adjustment amount of the first TA is 0, the adjusted uplink TA is the same as the first TA. When the adjustment amount of the first TA is not 0, the adjusted uplink TA is determined according to the first TA and the adjustment amount of the first TA.

[0161] As an example, the adjusted uplink TA may be determined according to the following formula (5).

[0162] TA=TA1+Δ (5)

[0163] Wherein, TA is the adjusted uplink TA, TA1 is the first TA determined by the terminal, and Δ is the adjustment amount of the first TA.

[0164] After receiving Msg3, the serving cell base station knows the adjusted uplink TA of the terminal and sends Msg4 to the terminal. After the random access is successful, the serving cell base station receives any uplink transmission sent by the terminal using the adjusted uplink TA.

[0165] In the two-step random access scenario, the terminal uses the first TA to send MsgA to the serving cell base station, and the process of adjusting the first TA is as follows: Fig.10 shown.

[0166] After the terminal determines the first TA based on the TA offset value and the TA estimation value, it uses the first TA to send MsgA to the serving cell base station to notify the serving cell base station of a random access request, while enabling the serving cell base station to estimate the transmission delay between the base station and the terminal and use it to calibrate the first TA.

[0167] After receiving MsgA sent by the terminal, the serving cell base station sends MsgB to the terminal to inform the terminal of uplink resource information that can be used after the random access is successful, and carries the adjustment amount of the first TA in MsgB.

[0168] It should be noted that if the time when the uplink transmissions from the terminals in the same time slot but different frequency domain resources arrive at the serving cell base station is basically aligned, the adjustment amount of the first TA can be 0. If there is a deviation in the time when the uplink transmissions from the terminals in the same time slot but different frequency domain resources arrive at the serving cell base station, the adjustment amount of the first TA is notified to the terminal in MsgB.

[0169] The terminal receives MsgB, and adjusts the first TA based on the adjustment amount of the first TA carried in MsgB.

[0170] In summary, in the embodiment of the present application, the terminal determines the first TA for sending the uplink message based on the introduced TA offset value, thereby avoiding the situation where the terminal over-compensates the TA due to the error in positioning accuracy. In addition, the terminal can also calibrate the first TA according to the instruction of the serving cell base station after the random access is completed. By determining the first TA by the terminal and recalibrating the serving cell base station, when the terminal uses the first TA to send an uplink message, it will not interfere with the network side receiving the uplink signal of the previous symbol or sending the downlink signal, thereby ensuring the signal reception performance on the network side.

[0171] Fig.11 is a flowchart of a communication method based on a first TA according to another exemplary embodiment of the present application. The method can be applied in an NTN scenario. The uplink communication method may include at least part of the following contents:

[0172] Step 1110: The terminal determines a first TA according to the TA offset value and the TA estimation value.

[0173] Among them, the TA offset value is used to indicate the offset of the round-trip delay of signal propagation between the terminal and the serving cell base station, and the TA estimate value is the round-trip delay of signal propagation between the terminal and the serving cell satellite estimated by the terminal based on the positioning capability.

[0174] The above-mentioned TA offset value may be a predefined TA offset value, or may be a public TA offset value or a dedicated TA offset value sent by the serving cell base station to the terminal, and the embodiment of the present application does not limit this.

[0175] Step 1120: In the RRC connected state, the terminal uses the first TA to send uplink transmission to the serving cell base station.

[0176] The uplink transmission includes at least one of PUSCH (Physical Uplink Shared Channel), PUCCH (Physical Uplink Control Channel) and SR (Scheduling Request).

[0177] Step 1130: The serving cell base station receives uplink transmission sent by the terminal using the first TA.

[0178] The serving cell base station monitors the uplink transmission from the terminal side in real time, and learns the first TA used by the terminal by receiving any uplink transmission of a terminal. In addition, the serving cell base station can further determine the adjustment value of the first TA for the terminal according to the first TA. The embodiment of the present application does not limit this.

[0179] To sum up, in the embodiment of the present application, a TA offset value is introduced in the process of the terminal determining the uplink TA, so as to avoid the situation where the terminal over-compensates the TA due to the error in positioning accuracy. Therefore, it will not interfere with the network side receiving the uplink signal of the previous symbol or sending the downlink signal, thereby ensuring the signal reception performance on the network side.

[0180] Fig.12 12 is a schematic structural diagram of an uplink TA determination device according to an exemplary embodiment. The device 1200 may be configured in a terminal. The device 1200 includes:

[0181] Determination module 1210 is used to determine a first TA based on a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate an offset of a round-trip delay of signal propagation between the device and a serving cell base station, and the TA estimate value is an estimate of a round-trip delay of signal propagation between the device and a serving cell satellite based on the positioning capability of the device.

[0182] Optionally, the TA offset value is any of the following:

[0183] A common TA offset value, where the common TA offset value is a TA offset value configured by a serving cell base station for a serving cell where the device is located according to a first positioning capability, where the first positioning capability is a positioning capability of at least one terminal in the serving cell;

[0184] a predefined TA offset value, where the predefined TA offset value is a TA offset value pre-configured for the device according to a second positioning capability, where the second positioning capability is a positioning capability of at least one terminal;

[0185] The dedicated TA offset value is a TA offset value configured by the serving cell base station for the device according to the third positioning capability, and the third positioning capability is the positioning capability of the device.

[0186] Optionally, the TA estimate is estimated by the device according to the current location of the device and the first ephemeris information;

[0187] The first ephemeris information is the ephemeris information of the serving cell satellite.

[0188] Optionally, when the device is in a non-terrestrial communication network NTN scenario based on a regenerative load, or when the device is in an NTN scenario based on a transparent load and the second TA cannot be acquired, the second TA is a TA on a feeder link between a serving cell satellite and a serving cell base station;

[0189] The determination module 1210 is used to:

[0190] A first difference between the TA estimate and the TA offset is determined, and the first difference is determined as a first TA.

[0191] Optionally, in a case where the device is in an NTN scenario based on transparent load;

[0192] The determination module 1210 further includes:

[0193] An acquisition submodule 1211 is used to acquire a second TA on a feeder link between a serving cell satellite and a serving cell base station;

[0194] The determination submodule 1212 is configured to determine a first TA according to the TA estimation value, the TA offset value and the second TA.

[0195] Optionally, the determination submodule 1212 includes:

[0196] A first determining subunit is configured to determine a third TA according to the estimated TA value and the second TA, where the third TA is a round trip delay of signal propagation between the device and the serving cell base station estimated by the device based on the positioning capability;

[0197] The second determining subunit is used to determine a second difference between the third TA and the TA offset value, and use the second difference as the first TA.

[0198] Optionally, the apparatus 1200 further includes:

[0199] The sending module is used to send an uplink message using the first TA, where the uplink message includes Msg1 or MsgA in the random access process.

[0200] Optionally, the sending module is further used for:

[0201] The first TA is used to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH, and a scheduling request SR.

[0202] In the embodiment of the present application, by introducing the TA offset value, the accuracy of the terminal in determining the uplink TA is improved, thereby avoiding the situation where the terminal over-compensates the TA due to the error in positioning accuracy. Therefore, it will not cause interference to the network side's reception of the uplink signal of the previous symbol or the sending of the downlink signal, thereby ensuring the signal reception performance on the network side.

[0203] Fig.13 1 is a schematic diagram of a structure of an uplink TA determination device according to another exemplary embodiment. The device 1300 may be configured in a network device (eg, a serving cell base station). The device 1300 includes:

[0204] The sending module 1310 is configured to send a TA offset value to the terminal, where the TA offset value is used to instruct the terminal to determine a first TA according to the TA offset value.

[0205] Optionally, the sending module 1310 is further configured to:

[0206] Sending a common TA offset value to the terminal, where the common TA offset value is a TA offset value configured for a serving cell where the terminal is located according to a first positioning capability, where the first positioning capability is a positioning capability of at least one terminal in the serving cell;

[0207] or,

[0208] A dedicated TA offset value is sent to the terminal, where the dedicated TA offset value is a TA offset value configured for the terminal according to a third positioning capability, and the third positioning capability is the positioning capability of the terminal.

[0209] Optionally, the device 1300 further includes:

[0210] The receiving module is used to receive an uplink message sent by the terminal using the first TA, where the uplink message includes the first message Msg1 or MsgA in the random access process.

[0211] Optionally, the receiving module is further used for:

[0212] The receiving terminal uses the first TA to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH and a scheduling request SR.

[0213] In the embodiment of the present application, the serving cell base station configures a TA offset value for the terminal to avoid the situation where the terminal over-compensates the TA due to an error in positioning accuracy. Therefore, it will not interfere with the serving cell base station receiving the uplink signal of the previous symbol or sending the downlink signal, thereby ensuring the signal reception performance of the serving cell base station.

[0214] Fig.14 The schematic diagram of the structure of a communication device provided by an exemplary embodiment of the present application is shown, and the communication device can be a terminal and a serving cell base station in the embodiment of the present application. The terminal includes: a processor 1401, a receiver 1402, a transmitter 1403, a memory 1404 and a bus 1405.

[0215] The processor 1401 includes one or more processing cores. The processor 1401 executes various functional applications and information processing by running software programs and modules.

[0216] The receiver 1402 and the transmitter 1403 may be implemented as a communication component, which may be a communication chip.

[0217] The memory 1404 is connected to the processor 1401 via a bus 1405 .

[0218] The memory 1404 may be used to store at least one instruction, and the processor 1401 may be used to execute the at least one instruction to implement the various steps performed by the terminal and the serving cell base station in the above-mentioned various method embodiments.

[0219] In addition, the memory 1404 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. The volatile or non-volatile storage device includes but is not limited to: a magnetic disk or an optical disk, an EEPROM (Electrically Erasable Programmable read only memory), an EPROM (Erasable Programmable Read-Only Memory), a SRAM (Static Random Access Memory), a ROM (Read Only Memory), a magnetic storage device, a flash memory, and a PROM (Programmable Read-Only Memory).

[0220] The present application provides a computer-readable storage medium, in which at least one instruction is stored. The at least one instruction is loaded and executed by the processor to implement the uplink TA determination method provided by each of the above method embodiments.

[0221] The present application also provides a computer program product. When the computer program product is run on a computer, the computer executes the uplink TA determination method provided by each of the above method embodiments.

[0222] Those skilled in the art should be aware that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented with hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein the communication media include any media that facilitates the transmission of a computer program from one place to another. The storage medium can be any available medium that a general or special-purpose computer can access.

[0223] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining an uplink timing advance TA, characterized in that: Applied to a terminal, the method comprises: Determine a first TA according to a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate an offset of a round-trip delay of signal propagation between the terminal and a serving cell base station, and the TA estimate value is a round-trip delay of signal propagation between the terminal and a serving cell satellite estimated by the terminal based on a positioning capability; The TA offset value is any of the following: a common TA offset value, where the common TA offset value is a TA offset value configured by the serving cell base station for the serving cell where the terminal is located according to a first positioning capability, where the first positioning capability is a positioning capability of at least one terminal in the serving cell; a predefined TA offset value, where the predefined TA offset value is a TA offset value pre-configured for the terminal according to a second positioning capability, where the second positioning capability is a positioning capability of at least one terminal; A dedicated TA offset value, where the dedicated TA offset value is a TA offset value configured by the serving cell base station for the terminal according to a third positioning capability, and the third positioning capability is the positioning capability of the terminal.

2. The method according to claim 1, characterized in that The TA estimated value is estimated by the terminal according to the current location of the terminal and the first ephemeris information; The first ephemeris information is the ephemeris information of the serving cell satellite.

3. The method according to claim 1, characterized in that The terminal is located in a non-terrestrial communication network NTN scenario based on a regenerative load, or the terminal is located in an NTN scenario based on a transparent load, and cannot acquire a second TA, where the second TA is a TA on a feeder link between the serving cell satellite and the serving cell base station; The determining the first TA according to the TA offset value and the TA estimated value includes: A first difference between the TA estimation value and the TA offset value is determined, and the first difference is used as the first TA.

4. The method according to claim 1, characterized in that: The terminal is located in an NTN scenario based on transparent transmission load; The determining the first TA according to the TA offset value and the TA estimated value further includes: Acquire a second TA on a feeder link between the serving cell satellite and the serving cell base station; The first TA is determined according to the TA estimation value, the TA offset value and the second TA.

5. The method according to claim 4, characterized in that The determining a first TA according to the TA estimated value, the TA offset value and the second TA includes: Determine a third TA according to the TA estimate and the second TA, where the third TA is a round-trip delay of signal propagation between the terminal and the serving cell base station estimated by the terminal based on positioning capability; A second difference between the third TA and the TA offset value is determined, and the second difference is used as the first TA.

6. The method according to claim 1, characterized in that The method further comprises: An uplink message is sent using the first TA, where the uplink message includes a first message Msg1 or MsgA in a random access process.

7. The method according to claim 6, characterized in that The method further comprises: The first TA is used to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH, and a scheduling request SR.

8. A method for determining an uplink timing advance TA, characterized in that: Applied in a serving cell base station, the method comprises: Sending a TA offset value to the terminal, where the TA offset value is used to instruct the terminal to determine a first TA according to the TA offset value and a TA estimate value, where the TA offset value is used to indicate an offset of a round trip delay of signal propagation between the terminal and a serving cell base station, where the TA estimate value is a round trip delay of signal propagation between the terminal and a serving cell satellite estimated by the terminal based on positioning capability; The TA offset value is any of the following: a common TA offset value, where the common TA offset value is a TA offset value configured by the serving cell base station for the serving cell where the terminal is located according to a first positioning capability, where the first positioning capability is a positioning capability of at least one terminal in the serving cell; a predefined TA offset value, where the predefined TA offset value is a TA offset value pre-configured for the terminal according to a second positioning capability, where the second positioning capability is a positioning capability of at least one terminal; or A dedicated TA offset value, where the dedicated TA offset value is a TA offset value configured by the serving cell base station for the terminal according to a third positioning capability, and the third positioning capability is the positioning capability of the terminal.

9. The method according to claim 8, characterized in that The method further comprises: An uplink message is received, which is sent by the terminal using the first TA, where the uplink message includes a first message Msg1 or MsgA in a random access process.

10. The method according to claim 9, characterized in that The method further comprises: The receiving terminal uses the first TA to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH and a scheduling request SR.

11. A device for determining an uplink timing advance TA, characterized in that: The device comprises: a determining module, configured to determine a first TA according to a TA offset value and a TA estimate value, wherein the TA offset value is used to indicate an offset of a round-trip delay of signal propagation between the device and a serving cell base station, and the TA estimate value is a round-trip delay of signal propagation between the device and a serving cell satellite estimated by the device based on a positioning capability; The TA offset value is any of the following: a common TA offset value, where the common TA offset value is a TA offset value configured by the serving cell base station for the serving cell where the device is located according to a first positioning capability, where the first positioning capability is a positioning capability of at least one terminal in the serving cell; a predefined TA offset value, wherein the predefined TA offset value is a TA offset value pre-configured for the apparatus according to a second positioning capability, wherein the second positioning capability is a positioning capability of at least one terminal; A dedicated TA offset value, where the dedicated TA offset value is a TA offset value configured by the serving cell base station for the device according to a third positioning capability, and the third positioning capability is the positioning capability of the device.

12. The device according to claim 11, characterized in that The TA estimate is estimated by the device according to the current location of the device and the first ephemeris information; The first ephemeris information is the ephemeris information of the serving cell satellite.

13. The device according to claim 11, characterized in that The device is located in a non-terrestrial communication network NTN scenario based on a regenerative load, or the device is located in an NTN scenario based on a transparent load, and a second TA cannot be acquired, where the second TA is a TA on a feeder link between the serving cell satellite and the serving cell base station; The determining module is used to: A difference between the TA estimation value and the TA offset value is determined, and the difference is used as the first TA.

14. The device according to claim 11, characterized in that The device is located in an NTN scenario based on transparent load; The determining module further includes: An acquisition submodule, used to acquire a second TA on a feeder link between the serving cell satellite and the serving cell base station; A determination submodule is used to determine a first TA according to the TA estimation value, the TA offset value and the second TA.

15. The device according to claim 14, characterized in that The determination submodule comprises: A first determining subunit is configured to determine a third TA according to the TA estimation value and the second TA, wherein the third TA is a round trip delay of signal propagation between the device and the serving cell base station estimated by the device based on positioning capability; The second determining subunit is used to determine a second difference between the third TA and the TA offset value, and use the second difference as the first TA.

16. The device according to claim 11, characterized in that The device also includes: The sending module is used to use the first TA to send an uplink message, where the uplink message includes the first message Msg1 or MsgA in the random access process.

17. The device according to claim 16, characterized in that The sending module is also used for: The first TA is used to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH, and a scheduling request SR.

18. A device for determining an uplink timing advance TA, characterized in that: The device comprises: a sending module, configured to send a TA offset value to a terminal, wherein the TA offset value is used to instruct the terminal to determine a first TA according to the TA offset value and a TA estimated value, wherein the TA offset value is used to indicate an offset of a round-trip delay of signal propagation between the terminal and a serving cell base station, and the TA estimated value is a round-trip delay of signal propagation between the terminal and a serving cell satellite estimated by the terminal based on a positioning capability; The TA offset value is any of the following: a common TA offset value, where the common TA offset value is a TA offset value configured for a serving cell where the terminal is located according to a first positioning capability, where the first positioning capability is a positioning capability of at least one terminal in the serving cell; a predefined TA offset value, where the predefined TA offset value is a TA offset value pre-configured for the terminal according to a second positioning capability, where the second positioning capability is a positioning capability of at least one terminal; or A dedicated TA offset value, where the dedicated TA offset value is a TA offset value configured for the terminal according to a third positioning capability, and the third positioning capability is the positioning capability of the terminal.

19. The device according to claim 18, characterized in that The device also includes: The receiving module is used to receive an uplink message sent by the terminal using the first TA, where the uplink message includes the first message Msg1 or MsgA in the random access process.

20. The device according to claim 19, characterized in that The receiving module is also used for: The receiving terminal uses the first TA to send uplink transmission, where the uplink transmission includes at least one of a physical uplink control channel PUSCH, a physical uplink control channel PUCCH and a scheduling request SR.

21. A terminal, characterized in that: The terminal includes a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is used to be executed by the processor to implement the steps of any one of the methods of claims 1-7.

22. A network device, characterized in that: The network device comprises a processor and a memory, wherein the memory stores at least one instruction, and the at least one instruction is used to be executed by the processor to implement the steps of any one of the methods of claims 8-10.

23. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by a processor, the steps of any method of claims 1-7 are implemented.

24. A computer-readable storage medium having instructions stored thereon, characterized in that: When the instructions are executed by a processor, the steps of any one of the methods of claims 8 to 10 are implemented.

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