Timing advance determination method and apparatus, and storage medium

Abstract

Provided are a timing advance determination method and apparatus, and a storage medium. The method comprises: on the basis of a duplex mode of a terminal and a duplex mode of a network-side device, determining a timing advance for an uplink transmission of the terminal.

Description

Methods, devices, and storage media for determining advance timing

[0001] This disclosure claims priority to Chinese patent application No. 202510127514.1, filed on January 27, 2025, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of communication technology, and in particular to a method, apparatus and storage medium for determining timing advance. Background Technology

[0003] Time division duplexing (TDD) has been widely used in commercial wireless communication deployments. In TDD, time-domain resources are allocated between the downlink and uplink.

[0004] Allocating limited duration to the uplink will result in reduced coverage, increased latency, and decreased system capacity. Therefore, it is worthwhile to investigate the feasibility of allowing downlink and uplink to coexist, a concept known as full-duplex.

[0005] The full-duplex evolution solution provides enhanced uplink coverage, reduced latency, increased system capacity, and improved TDD configuration flexibility in unpaired spectrum.

[0006] Currently, no solution has been provided for determining the timing advance for full-duplex schemes. Summary of the Invention

[0007] The technical solutions provided in this disclosure are as follows:

[0008] On the one hand, a method for determining the timing advance is provided, the method including:

[0009] The timing advance of the terminal's uplink transmission is determined based on the duplex mode of the terminal and the duplex mode of the network-side equipment.

[0010] On another front, a timing advance determination device is provided, the device comprising:

[0011] The determination module is used to determine the timing advance of the uplink transmission of the terminal based on the duplex mode of the terminal and the duplex mode of the network-side device.

[0012] In another aspect, a communication device is provided, comprising: a memory and a processor; the memory and the processor are coupled; the memory is used to store computer program instructions executable by the processor; and the processor executes the computer program instructions to implement the timing advance determination method of any of the above embodiments.

[0013] In another aspect, a computer-readable storage medium is provided, on which computer program instructions are stored, which, when executed on a computer (e.g., a communication device or a signal transmission device), implement the timing advance determination method of any of the above embodiments. In some embodiments, the computer-readable storage medium includes a non-transitory computer-readable storage medium.

[0014] In another aspect, a computer program product is provided, which includes computer program instructions that, when executed, implement the timing advance determination method of any of the above embodiments. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in this disclosure, the accompanying drawings used in some embodiments of this disclosure will be briefly described below. Obviously, the drawings described below are merely drawings of some embodiments of this disclosure, and those skilled in the art can obtain other drawings based on these drawings.

[0016] Figure 1 is an architecture diagram of a communication system provided according to an embodiment of the present disclosure;

[0017] Figure 2 is a flowchart of a method for determining timing advance according to an embodiment of the present disclosure;

[0018] Figure 3 is a schematic diagram of the first type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0019] Figure 4 is a second schematic diagram of timing advance under duplex mode combination according to an embodiment of the present disclosure;

[0020] Figure 5 is a third schematic diagram of timing advance under duplex mode combination according to the embodiments of this disclosure;

[0021] Figure 6 is a schematic diagram of the fourth type of timing advance under duplex mode combination according to the embodiments of this disclosure;

[0022] Figure 7 is a fifth schematic diagram of timing advance under duplex mode combination according to an embodiment of the present disclosure;

[0023] Figure 8 is a sixth schematic diagram of timing advance under duplex mode combination according to an embodiment of the present disclosure;

[0024] Figure 9 is a seventh schematic diagram of timing advance under duplex mode combination according to the embodiments of this disclosure;

[0025] Figure 10 is an eighth schematic diagram of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0026] Figure 11 is a ninth schematic diagram of timing advance under duplex mode combination according to an embodiment of the present disclosure;

[0027] Figure 12 is a tenth schematic diagram of timing advance under duplex mode combination according to an embodiment of the present disclosure;

[0028] Figure 13 is an eleventh schematic diagram of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0029] Figure 14 is a schematic diagram of the twelfth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0030] Figure 15 is a schematic diagram of the thirteenth timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0031] Figure 16 is a schematic diagram of the fourteenth timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0032] Figure 17 is a schematic diagram of the fifteenth timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0033] Figure 18 is a schematic diagram of the sixteenth timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0034] Figure 19 is a schematic diagram of the seventeenth timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0035] Figure 20 is a schematic diagram of the eighteenth timing advance under duplex mode combination according to the embodiments of this disclosure;

[0036] Figure 21 is a schematic diagram of the nineteenth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0037] Figure 22 is a schematic diagram of the twentieth timing advance under duplex mode combination according to the embodiments of this disclosure;

[0038] Figure 23 is a schematic diagram of the twenty-first type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0039] Figure 24 is a schematic diagram of the twenty-second type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0040] Figure 25 is a schematic diagram of the twenty-third type of timing advance under duplex mode combination according to the embodiments of this disclosure;

[0041] Figure 26 is a schematic diagram of the twenty-fourth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0042] Figure 27 is a schematic diagram of the twenty-fifth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0043] Figure 28 is a schematic diagram of the twenty-sixth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0044] Figure 29 is a schematic diagram of the twenty-seventh type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0045] Figure 30 is a schematic diagram of the twenty-eighth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0046] Figure 31 is a schematic diagram of the twenty-ninth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0047] Figure 32 is a schematic diagram of the thirtieth type of timing advance under duplex mode combination according to the embodiments of the present disclosure;

[0048] Figure 33 is a block diagram of a timing advance determination device provided according to an embodiment of the present disclosure;

[0049] Figure 34 is a block diagram of a communication device provided according to an embodiment of the present disclosure. Detailed Implementation

[0050] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0051] In this disclosure, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. The "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. Furthermore, "at least one" means one or more, and "multiple" means two or more. The terms "first," "second," etc., do not limit the quantity or order of execution, and "first," "second," etc., do not necessarily imply differences.

[0052] It should be noted that in this disclosure, the words "exemplarily" or "for example" are used to indicate examples, illustrations, or explanations. Any embodiment or design described as "exemplarily" or "for example" in this disclosure should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of the words "exemplarily" or "for example" is intended to present the relevant concepts in a specific manner.

[0053] The full-duplex evolution solution can provide enhanced uplink coverage, reduced latency, increased system capacity, and improved configuration flexibility for TDD operations in unpaired spectrum.

[0054] Currently, no solution has been provided for determining the timing advance for full-duplex schemes.

[0055] In this embodiment of the present disclosure, a method for determining timing advance is provided. The method includes: determining the timing advance of the terminal's uplink transmission based on the duplex mode of the terminal and the duplex mode of the network-side device.

[0056] Therefore, considering both the duplex mode of the terminal and the duplex mode of the network-side equipment, a solution for determining the timing advance of the terminal's uplink transmission is given under various combinations of the two, providing a certain foundation for the further evolution of full-duplex.

[0057] The technical solutions provided in this disclosure can be applied to various communication systems, such as new radio (NR) communication systems using 5G communication technology, future evolution systems, or multiple communication convergence systems.

[0058] For example, Figure 1 shows an architecture diagram of a communication system provided according to an embodiment of the present disclosure. The communication system may include a network-side device 10 and one or more terminals 11, and the network-side device 10 may be communicatively connected to the one or more terminals 11.

[0059] Here, network-side equipment 10 can be a base station or evolved Node B (eNB) in Long Term Evolution (LTE), Long Term Evolution Davanced (LTEA), a base station in 5G networks, or a base station in future communication systems. Base stations can include various macro base stations, micro base stations, femtocell base stations, remote wireless extensions, reconfigurable intelligent surfaces (RISS), routers, relays, transmit-receive processors (TRPs), wireless fidelity (WIFI) devices, and other network-side equipment.

[0060] Terminal 11 is a device with wireless transceiver capabilities that can be deployed on land, including indoors or outdoors, handheld, wearable, or vehicle-mounted; it can also be deployed on water (such as on ships); and it can also be deployed in the air (e.g., airplanes, balloons, and satellites). User terminals can be mobile phones, tablets, computers with wireless transceiver capabilities, virtual reality (VR) terminals, augmented reality (AR) terminals, wireless terminals in industrial control, wireless terminals in self-driving vehicles, wireless terminals in remote medical care, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, etc. The embodiments disclosed herein do not limit the application scenarios. User terminals may also be referred to as terminal equipment, access terminals, UE (User equipment) units, UE stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, UE terminals, wireless communication equipment, UE agents, or UE devices, etc.

[0061] It should be noted that Figure 1 is only an exemplary framework diagram. The number of devices included in Figure 1 and the names of each device are not limited. In addition to the devices shown in Figure 1, the communication system may also include other devices, such as core network devices.

[0062] The application scenarios of the embodiments disclosed herein are not limited. The system architecture and business scenarios described in the embodiments of this disclosure are for the purpose of more clearly illustrating the technical solutions of the embodiments of this disclosure, and do not constitute a limitation on the technical solutions provided by the embodiments of this disclosure. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided by the embodiments of this disclosure are also applicable to similar technical problems.

[0063] To facilitate understanding of this disclosure, the concept of timing advance (TA) is introduced.

[0064] Timing advance is typically used for terminal uplink transmission. It refers to sending data packets a corresponding amount of time in advance in order to ensure that the terminal's uplink data arrives at the network-side device at the expected time, based on the estimated radio frequency transmission delay caused by distance.

[0065] For example, an important feature of uplink transmission is that different terminals have orthogonal multiple access in time and frequency, that is, uplink transmissions from different terminals from the same cell do not interfere with each other.

[0066] To ensure orthogonality of uplink transmission and avoid intra-cell interference, network-side equipment requires that signals from different terminals originating from the same subframe but using different frequency domain resources arrive at the network-side equipment at essentially synchronized times. As long as the network-side equipment receives the uplink data sent by the terminal within the cyclic prefix (CP) range, it can correctly decode the uplink data. Therefore, uplink synchronization requires that the arrival times of signals from different terminals originating from the same subframe all fall within a certain range.

[0067] To ensure time synchronization on the receiving side (network side equipment), an uplink timing advance mechanism was proposed.

[0068] For the terminal side, timing advance is essentially a negative offset between the start time of receiving downlink subframes and the time of transmitting uplink subframes. By appropriately controlling the offset of each terminal, the network-side device can control the arrival time of uplink signals from different terminals. For terminals farther from the network-side device, due to the larger transmission delay, uplink data must be sent earlier than for terminals closer to the network-side device.

[0069] As an example, here are the steps to determine the reception time of the next downlink subframe:

[0070] The terminal listens to the primary common control physical channel (PCCPCH) and demodulates the system information block (SIB).

[0071] The SIB contains the master information block (MIB), which contains the initial value of the system frame number and other system parameters.

[0072] The terminal uses its local clock and parameters in the MIB to calculate the expected reception time for the current system frame number.

[0073] When the terminal detects the Primary Synchronization Signal (PSS), it can accurately correct its local clock using the PSS time stamp and calculate the expected reception time of the next PSS (i.e., the PSS of the next downlink subframe).

[0074] Finally, the terminal can calculate the time interval between subframes by measuring the time difference between PSS and PSS, and then deduce the reception time of the next downlink subframe.

[0075] As can be seen, the terminal can predict the reception time of the next downlink subframe and, based on this, send the uplink subframe a certain time in advance. Here, the advance time can be calculated based on the timing advance.

[0076] It should be noted that the above steps are only one way for the terminal to predict the reception time of the next downlink subframe. Other methods can also be used, and this disclosure does not limit them.

[0077] The timing advance determination method provided in this disclosure can be applied to network-side devices, where the network-side device determines the timing advance amount and then informs the terminal of the timing advance amount by sending a timing advance command. Alternatively, it can be directly applied to the terminal, where the terminal determines the timing advance amount itself.

[0078] As shown in Figure 2, this embodiment of the present disclosure provides a method for determining timing advance, the method including the following steps:

[0079] S101: Determine the timing advance of the terminal's uplink transmission based on the duplex mode of the terminal and the duplex mode of the network-side equipment.

[0080] In one embodiment of this disclosure, the duplex mode of the terminal includes at least one of the following: subband non-overlapping full duplex (SBFD) mode, inband full duplex (IBFD) mode, and non-full duplex mode.

[0081] In SBFD mode, transmission and reception are performed simultaneously on different sub-bands (also known as frequency domain resources) within the same carrier. This combines the advantages of TDD (time division duplex) and frequency division duplex (FDD), eliminating the need for symmetrical spectrum resources and reducing transmission latency while improving uplink coverage performance.

[0082] In IBFD mode, transmission and reception are performed simultaneously on the same sub-band (also known as frequency domain resource) within the same carrier. If this sub-band occupies the entire carrier, transmission and reception are performed simultaneously within the entire carrier (also known as FD). It combines the advantages of FDD and TDD, and theoretically, the spectral efficiency can be doubled, but it will introduce additional interference.

[0083] In this embodiment of the disclosure, non-full-duplex mode refers to a working mode that does not involve simultaneously receiving and transmitting data, and is neither IBFD nor SBFD mode. However, non-full-duplex mode can be a conventional duplex mode, such as time-division duplex or frequency-division duplex.

[0084] In this embodiment of the disclosure, the terminal and the network-side device each correspond to a duplex mode, that is, the terminal can adopt one of SBFD mode, IBFD mode and non-full-duplex mode, and the network-side device can also adopt one of SBFD mode, IBFD mode and non-full-duplex mode.

[0085] The duplex modes adopted by the terminal and network-side equipment can be combined in nine ways. In this embodiment, a scheme for determining the timing advance of the terminal's uplink transmission is provided for each combination, as detailed below.

[0086] In one embodiment of this disclosure, the terminal adopts a non-full-duplex mode, and the network-side device also adopts a non-full-duplex mode. When both the terminal and the network-side device adopt FDD mode, the timing advance of the terminal's uplink transmission is determined as a first advance; when both the terminal and the network-side device adopt TDD mode, the timing advance of the terminal's uplink transmission is determined as a second advance.

[0087] Here, a terrestrial network (TN) networking method is adopted between the terminal and the network-side equipment. That is, in the case of terrestrial network, the first lead time is determined based on the bidirectional transmission delay between the terminal and the network-side equipment.

[0088] Here, in the terrestrial network configuration, the first lead time TA = NTA * TC, and the second lead time TA = (NTA + NTA, offset) * TC, where NTA represents the basic time quantity corresponding to the timing advance, NTA, offset represents the basic time quantity corresponding to the transmit / receive conversion time, and TC represents the basic time.

[0089] Referring to Figure 3, which is a first schematic diagram of timing advance under duplex mode combination according to the embodiments of this disclosure, CP represents the cyclic prefix, DL() represents the downlink subband, UL represents the uplink subband, the dashed line represents the downlink subframe reception time, and TA represents the timing advance determined based on the bidirectional transmission delay between the terminal and the network-side equipment. The method for determining the downlink subframe reception time can be found above.

[0090] It should be noted that, unless otherwise defined, the reference numerals in the other figures below have the same meaning.

[0091] In the embodiment shown in Figure 3, since both the terminal and the network-side equipment adopt FDD mode, that is, the frequencies of the uplink sub-band and the downlink sub-band are separated. For example, the first frequency band is only used for uplink transmission and the second frequency band is only used for downlink transmission. Each frequency band does not need to switch between uplink and downlink. Therefore, when determining the timing advance, only the bidirectional transmission delay between the terminal and the network-side equipment needs to be considered, and the transmit / receive conversion time does not need to be considered.

[0092] It should be noted that in the embodiment shown in Figure 3, the uplink reception start time and downlink transmission start time are aligned for the network-side device. However, this does not limit this embodiment. Even if they are not aligned, the timing advance can still be determined based on the bidirectional transmission delay between the terminal and the network-side device.

[0093] Referring to Figure 4, CP represents the cyclic prefix, DL represents the downlink subband, UL represents the uplink subband, and GP represents the guard slot, during which no data is transmitted. The dashed line represents the downlink subframe reception time, TA represents the timing advance determined based on the bidirectional transmission delay between the terminal and network-side equipment, and AO represents the transmit / receive switching time.

[0094] For example, in the embodiment shown in Figure 4, the network-side device needs to switch from receiving at UL to transmitting at DL, which requires a transmit / receive switching time AO. In order to compensate for this transmit / receive switching time, the timing advance of the terminal's uplink transmission is determined to be a second advance.

[0095] In the case of terrestrial networks, the second lead time includes the first lead time and the lead time determined based on the transmit / receive switching time of network-side equipment.

[0096] It should be noted that the downlink subframe reception time is calculated, or it can be understood as the terminal's estimate. Therefore, even if the network-side device does not continuously send downlink subframes, the terminal can still determine the downlink subframe reception time and, based on this, advance the timing by an extra amount as the time to send the uplink subframe. As shown in Figure 4, the terminal did not receive the downlink subframe at time a, but time a is still the downlink subframe reception time. Based on time a, the uplink transmission is initiated with a second extra amount of advance, that is, uplink transmission begins at time b.

[0097] The embodiment shown in Figure 4 is illustrated using a terrestrial network as an example. For non-terrestrial networks, additional transmission delay can be considered when determining the timing advance.

[0098] In one embodiment of this disclosure, in the case of a non-terrestrial network, the first lead time, in addition to the first lead time corresponding to the terrestrial network, further includes: bidirectional transmission delay between the terminal and the non-terrestrial network side device, and bidirectional transmission delay between the non-terrestrial network side device and the first node; the first node includes at least one of the following: a non-terrestrial network (NTN) gateway, a terrestrial base station, and a reference point.

[0099] Here, in the non-terrestrial network topology, the first lead time TA = (NTA + NTA,adj,common + NTA,adj,UE) * TC, and the second lead time TA = (NTA + NTA,offset + NTA,adj,common + NTA,adj,UE) * TC, where NTA,adj,UE represent the bidirectional transmission delay between the terminal and the non-terrestrial network side equipment, and NTA,adj,common represent the bidirectional transmission delay between the non-terrestrial network side equipment and the first node.

[0100] In some embodiments of this disclosure, the timing advance can also be configured to 0, as detailed below.

[0101] In one embodiment of this disclosure, the terminal adopts SBFD mode and the network-side device adopts non-full-duplex mode.

[0102] For example, if the terminal uses SBFD mode and the network-side equipment uses non-full-duplex mode, the terminal's SBFD subband includes DL subband and UL subband. Since a single network-side equipment cannot communicate with a terminal using SBFD mode based on non-full-duplex mode, this scenario actually involves the terminal using different subbands to communicate with two network-side equipment respectively, or the DL subband and UL subband included in the terminal's SBFD subband corresponding to different carriers.

[0103] In one embodiment of this disclosure, referring to FIG5, the terminal communicates with a first network-side device through the DL subband included in the SBFD subband, and communicates with a second network-side device through the UL subband included in the SBFD subband; alternatively, the DL subband and UL subband included in the terminal's SBFD subband correspond to the first carrier and the second carrier, respectively. In this case, for uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0104] In this embodiment of the disclosure, the uplink transmission of the terminal is used to transmit non-full-duplex symbols or full-duplex symbols. Here, symbols transmitted by the terminal in full-duplex mode (including SBFD mode and IBFD mode), symbols received by the network-side device in full-duplex mode, or symbols transmitted by the terminal in full-duplex mode and received by the network-side device in full-duplex mode are all defined as full-duplex symbols. All other symbols are defined as non-full-duplex symbols.

[0105] In the communication scenario shown in Figure 5, for the uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0106] As shown in Figure 5, in the communication scenario shown in Figure 5, the time domains of the data transmission and reception of the first network-side device and the second network-side device are not aligned, or the time domains of the first carrier and the second carrier are not aligned. In this case, for the uplink transmission of a full-duplex symbol, the corresponding timing advance is the second advance.

[0107] It should be noted that, in this embodiment of the disclosure, for network-side devices, the reason for the misalignment of the time domain of transmitted and received data is only due to the transmit / receive conversion time, that is, the transmit / receive conversion time required during the process of converting from uplink reception to downlink transmission, and does not consider the misalignment of the time domain of transmitted and received data caused by other factors.

[0108] As shown in Figure 6, in the communication scenario shown in Figure 6, the first network-side device and the second network-side device transmit and receive data in the time domain, or the first carrier and the second carrier are aligned in the time domain. In this case, for the uplink transmission of a full-duplex symbol, the corresponding timing advance can be determined as the first advance.

[0109] For example, since the downlink sub-band and uplink sub-band of the network-side equipment are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0110] As shown in Figure 6, in the communication scenario shown in Figure 6, the first network-side device and the second network-side device transmit and receive data in the time domain, or the first carrier and the second carrier are time-domain aligned. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined to be 0, and the UL subband included in the terminal's SBFD subband and the UL subband of the second network-side device adopt a large cyclic prefix (LCP).

[0111] For example, the main difference between LCP and regular CP lies in length. LCP is a form of cyclic prefix, which is longer and can be used before OFDM symbols. The time occupied by LCP in the time domain is not less than the maximum bidirectional transmission delay. In the communication scenario shown in Figure 5, the UL subband included in the terminal's SBFD subband and the UL subband of the second network-side device use a large cyclic prefix. This is equivalent to using the time domain time occupied by the large cyclic prefix to make up for the transmission delay. For the uplink transmission of the terminal's full-duplex symbols, the corresponding timing advance can be determined to be 0, that is, it is not necessary to perform uplink transmission a certain time in advance based on the downlink subframe reception time.

[0112] In one embodiment of this disclosure, the terminal adopts IBFD mode and the network-side device adopts non-full-duplex mode.

[0113] For example, if the terminal uses IBFD mode and the network-side device uses non-full-duplex mode, the terminal can be configured with both an IBFD subband and a normal UL subband. Since a single network-side device cannot communicate with a terminal using IBFD mode based on non-full-duplex mode, this scenario actually involves the terminal using different subbands to communicate with two network-side devices, or the terminal's IBFD subband and UL subband corresponding to different carriers.

[0114] In one embodiment of this disclosure, referring to FIG7, the terminal communicates with a third network-side device through an IBFD subband and with a fourth network-side device through a UL subband; or, the terminal's IBFD subband corresponds to a third carrier and the terminal's UL subband corresponds to a fourth carrier.

[0115] In this case, for uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0116] As shown in Figure 7, in the communication scenario shown in Figure 7, the time domains of the data transmission and reception of the third network-side device and the fourth network-side device are not aligned, or the time domains of the third carrier and the fourth carrier are not aligned. In this case, the uplink transmission of the IBFD subband of the terminal can be disabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the second advance.

[0117] For example, under normal circumstances, the terminal's IBFD subband is used for both uplink transmission and downlink reception. However, in order to ensure the correct transmission of the terminal's normal UL subband, the uplink transmission of the terminal's IBFD subband can be disabled, meaning that the terminal's IBFD subband is only used for downlink reception.

[0118] Because the time domains of data transmission and reception by network-side devices are misaligned, or the time domains of the third and fourth carriers are misaligned, the uplink transmission of the terminal needs to compensate for the transmission and reception switching time of the network-side devices. Therefore, the corresponding timing advance is determined as the second advance.

[0119] As shown in Figure 8, in the communication scenario shown in Figure 8, the third network-side device and the fourth network-side device have time-domain alignment for transmitting and receiving data, or the third carrier and the fourth carrier have time-domain alignment. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the first advance.

[0120] For example, since the downlink sub-band and uplink sub-band on the terminal side are aligned in the time domain and there is no difference in transmit / receive conversion time between them, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time; that is, the first advance can be used.

[0121] Furthermore, for the same reasons as the communication scenario shown in Figure 7, the uplink transmission of the terminal's IBFD subband is disabled.

[0122] Referring to Figure 9, in the communication scenario shown in Figure 9, the time domains of the data transmission and reception of the third network-side device and the fourth network-side device are not aligned, or the time domains of the third carrier and the fourth carrier are not aligned. In this case, the downlink transmission of the IBFD subband of the terminal can be disabled. For the uplink transmission of the full-duplex symbol, the corresponding timing advance can be determined as the second advance.

[0123] For example, under normal circumstances, the terminal's IBFD subband is used for both uplink transmission and downlink reception. However, to ensure the correct transmission of the terminal's normal UL subband, downlink transmission of the terminal's IBFD subband can be disabled, meaning the terminal's IBFD subband is only used for downlink reception. In other words, the terminal's IBFD subband and the terminal's normal UL subband are aligned and used for uplink transmission simultaneously.

[0124] Because the time domains of data transmission and reception by network-side devices are misaligned, or the time domains of the third and fourth carriers are misaligned, the uplink transmission of the terminal needs to compensate for the transmission and reception switching time of the network-side devices. Therefore, the corresponding timing advance is determined as the second advance.

[0125] As shown in Figure 10, in the communication scenario shown in Figure 10, the third network-side device and the fourth network-side device have time-domain alignment for transmitting and receiving data, or the third carrier and the fourth carrier have time-domain alignment. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the first advance.

[0126] For example, since the downlink sub-band and uplink sub-band of the network-side equipment are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0127] Furthermore, for the same reasons as the communication scenario shown in Figure 9, downlink transmission of the terminal's IBFD subband is disabled.

[0128] As shown in Figure 11, in the communication scenario shown in Figure 11, the third network-side device and the fourth network-side device have time-domain alignment for transmitting and receiving data, or the third carrier and the fourth carrier have time-domain alignment. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined to be 0, and the terminal's IBFD subband, UL subband and the fourth network-side device's UL subband all adopt LCP.

[0129] For example, in the communication scenario shown in Figure 11, the terminal's IBFD subband, UL subband, and the UL subband of the fourth network-side device all use LCP, which is equivalent to using the time domain time occupied by the large cyclic prefix to make up for the transmission delay. For the uplink transmission of the terminal's full-duplex symbol, the corresponding timing advance can be determined to be 0, that is, it is not necessary to perform uplink transmission a certain time in advance based on the downlink subframe reception time.

[0130] In one embodiment of this disclosure, the terminal adopts a non-full-duplex mode, and the network-side device adopts an SBFD mode.

[0131] As shown in Figure 12, in the communication scenario shown in Figure 12, the SBFD subband of the network-side device includes the UL subband and the DL subband. For the uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0132] When the UL subband and DL subband included in the SBFD subband of the network-side device are not aligned in the time domain, the corresponding timing advance for the uplink transmission of full-duplex symbols is the second advance.

[0133] For example, because the UL subband and DL subband included in the SBFD subband of the network-side device are not aligned in the time domain, the terminal needs to make up for the time required for the network-side device to perform transmit and receive conversion during uplink transmission. Therefore, the corresponding timing advance is the second advance.

[0134] As shown in Figure 13, in the communication scenario shown in Figure 13, the SBFD subband of the network-side device includes the UL subband and the DL subband. The UL subband and the DL subband included in the SBFD subband of the network-side device are time-domain aligned. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0135] For example, since the SBFD subband of the network-side device includes the UL subband and the DL subband which are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends the uplink subframe does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0136] In one embodiment of this disclosure, the terminal adopts SBFD mode and the network-side device adopts SBFD mode.

[0137] Referring to Figure 14, when both the terminal and the network-side equipment are in SBFD mode, the terminal's SBFD subband includes both UL and DL subbands, and the network-side equipment's SBFD subband also includes both UL and DL subbands. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is still the second advance.

[0138] As shown in Figure 14, when the UL subband and DL subband included in the SBFD subband of the network-side device are not aligned in the time domain, the corresponding timing advance for the uplink transmission of full-duplex symbols is the second advance.

[0139] Because the UL and DL subbands included in the SBFD subband of the network-side equipment are not aligned in the time domain, they differ in the transmit / receive conversion time in the time domain. Therefore, when the terminal performs uplink transmission, it needs to make up for this transmit / receive conversion time, that is, the corresponding timing advance is the second advance.

[0140] Referring to Figure 15, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the timing advance for the uplink transmission of full-duplex symbols is the first advance.

[0141] For example, since the downlink sub-band and uplink sub-band of the network-side equipment are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0142] Referring to Figure 16, when the UL sub-band and DL sub-band contained in the SBFD sub-band of the network-side device are time-domain aligned, and the UL sub-band and DL sub-band contained in the SBFD sub-band of the terminal are also time-domain aligned, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined to be 0, and both the UL sub-band contained in the SBFD sub-band of the terminal and the UL sub-band contained in the SBFD sub-band of the network-side device adopt LCP.

[0143] In the communication scenario shown in Figure 16, both the UL subband included in the SBFD subband of the terminal and the UL subband included in the SBFD subband of the network-side device adopt LCP. This is equivalent to using the time domain time occupied by the large cyclic prefix to make up for the transmission delay. For the uplink transmission of the full-duplex symbol of the terminal, the corresponding timing advance can be determined to be 0, that is, it is not necessary to perform uplink transmission a certain time in advance based on the downlink subframe reception time.

[0144] In one embodiment of this disclosure, the terminal adopts IBFD mode and the network-side device adopts SBFD mode.

[0145] When the terminal uses IBFD mode and the network-side equipment uses SBFD mode, the terminal can be configured with both IBFD subbands and normal UL subbands. The SBFD subbands of the network-side equipment include UL subbands and DL subbands.

[0146] In one embodiment of this disclosure, referring to FIG17, for uplink transmission of non-full-duplex symbols, the corresponding timing advance is a second advance.

[0147] In the communication scenario shown in Figure 17, the UL sub-band and DL sub-band contained in the SBFD sub-band of the network-side device are not aligned in the time domain. In this case, the uplink transmission of the IBFD sub-band of the terminal can be disabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the second advance.

[0148] For example, under normal circumstances, the terminal's IBFD subband is used for both uplink transmission and downlink reception. However, in order to ensure the correct transmission of the terminal's normal UL subband, the uplink transmission of the terminal's IBFD subband can be disabled, meaning that the terminal's IBFD subband is only used for downlink reception.

[0149] Because the time domains of data transmission and reception are not aligned, the uplink transmission of the terminal needs to compensate for the transmission and reception switching time of the network-side devices. Therefore, the corresponding timing advance is determined as the second advance.

[0150] As shown in Figure 18, in the communication scenario shown in Figure 18, the UL sub-band and DL sub-band included in the SBFD sub-band of the network-side device are time-domain aligned. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the first advance.

[0151] For example, since the downlink sub-band and uplink sub-band included in the SBFD of the network-side device are aligned in the time domain and there is no difference in transmit / receive conversion time between them, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0152] Furthermore, for the same reasons as the communication scenario shown in Figure 17, the uplink transmission of the terminal's IBFD subband is disabled.

[0153] Referring to Figure 19, in the communication scenario shown in Figure 19, the UL subband and DL subband included in the SBFD subband of the network-side device are not aligned in the time domain. The downlink transmission of the IBFD subband of the terminal can be disabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the second advance.

[0154] For example, under normal circumstances, the terminal's IBFD subband is used for both uplink transmission and downlink reception. However, to ensure the correct transmission of the terminal's normal UL subband, downlink transmission of the terminal's IBFD subband can be disabled, meaning the terminal's IBFD subband is only used for downlink reception. In other words, the terminal's IBFD subband and the terminal's normal UL subband are aligned and used for uplink transmission simultaneously.

[0155] Because the time domains of data transmission and reception are not aligned on the network side, the uplink transmission of the terminal needs to compensate for the transmission and reception switching time of the network side. Therefore, the corresponding timing advance is determined as the second advance.

[0156] As shown in Figure 20, in the communication scenario shown in Figure 20, the UL sub-band and DL sub-band included in the SBFD sub-band of the network-side device are time-domain aligned. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the first advance.

[0157] For example, since the downlink sub-band and uplink sub-band of the network-side equipment are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0158] Furthermore, for the same reasons as the communication scenario shown in Figure 19, downlink transmission of the terminal's IBFD subband is disabled.

[0159] As shown in Figure 21, in the communication scenario illustrated, the UL and DL subbands included in the SBFD subband of the network-side device are time-domain aligned, and the IBFD subband and UL subband of the terminal are time-domain aligned. In this case, for uplink transmission of full-duplex symbols, the corresponding timing advance can be determined to be 0, and the SBFD subband, UL subband of the terminal, and the UL subband of the network-side device all adopt LCP.

[0160] For example, in the communication scenario shown in Figure 21, the SBFD subband, UL subband of the terminal and the UL subband of the network-side device all use LCP, which is equivalent to using the time domain time occupied by the large cyclic prefix to make up for the transmission delay. For the uplink transmission of the full-duplex symbol of the terminal, the corresponding timing advance can be determined to be 0, that is, it is not necessary to perform uplink transmission a certain time in advance based on the downlink subframe reception time.

[0161] In one embodiment of this disclosure, the terminal adopts a non-full-duplex mode, and the network-side device adopts an IBFD mode.

[0162] As shown in Figure 22, in the communication scenario shown in Figure 22, the SBFD subband of the network-side device includes the UL subband and the DL subband. For the uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0163] Network-side devices can be configured with IBFD subbands and ordinary UL subbands. When the IBFD subbands and UL subbands of the network-side devices are not aligned in the time domain, the timing advance for uplink transmission of the full-duplex symbol IBFD subband is the first advance; the timing advance for uplink transmission of the full-duplex symbol UL subband is the second advance.

[0164] For example, as shown in Figure 22, for uplink transmission of the full-duplex symbol IBDF subband, since the IBDF subband of the network-side device is delayed by one transmit / receive conversion time compared to the ordinary UL of the network-side device, the timing advance for uplink transmission of the full-duplex symbol IBDF subband is simply the first advance. For uplink transmission of the full-duplex symbol UL subband, the corresponding timing advance is the second advance, meaning that the timing advance needs to compensate for the transmit / receive conversion time.

[0165] As shown in Figure 23, in the communication scenario shown in Figure 23, the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned. In this case, for the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0166] For example, since the IBFD subband and UL subband of the network-side device are time-domain aligned, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first lead can be used.

[0167] As shown in Figure 24, in the communication scenario shown in Figure 24, the terminal adopts non-full-duplex mode and the network-side equipment adopts IBDF mode; for the uplink transmission of non-full-duplex symbols and full-duplex symbols, the corresponding timing advance is the first advance.

[0168] For example, since the IBDF subband of the network-side device has both uplink and downlink transmission functions, the network-side device does not need to perform transmit / receive conversion, and therefore does not need transmit / receive conversion time. Accordingly, regardless of whether it is a non-full-duplex symbol or a full-duplex symbol, the time for the terminal to send uplink subframes does not need to compensate for the transmit / receive conversion time. That is, for the uplink transmission of both non-full-duplex and full-duplex symbols, the first lead can be used.

[0169] In one embodiment of this disclosure, the terminal adopts SBFD mode and the network-side device adopts IBFD mode.

[0170] Referring to Figure 25, when the terminal uses SBFD mode and the network-side equipment uses IBFD mode, the terminal's SBFD subband includes UL subband and DL subband, while the network-side equipment can be configured with IBFD subband and ordinary UL subband. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is still the second advance.

[0171] As shown in Figure 25, when the IBFD subband and the ordinary UL subband of the network-side device are not aligned in the time domain, the corresponding timing advance for the uplink transmission of the full-duplex symbol is the second advance.

[0172] Because the IBFD subband and the ordinary UL subband of the network-side equipment are not aligned in the time domain, there is a difference in the transmit / receive conversion time in the time domain. Therefore, when the terminal performs uplink transmission, it needs to make up for this transmit / receive conversion time, that is, the corresponding timing advance is the second advance.

[0173] Referring to Figure 26, when the IBFD subband and the ordinary UL subband of the network-side device are time-domain aligned, the timing advance for the uplink transmission of the full-duplex symbol is the first advance.

[0174] For example, since the downlink sub-band and uplink sub-band of the network-side equipment are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0175] Referring to Figure 27, when the IBFD subband and UL subband of the network-side device are time-domain aligned, and the UL subband and DL subband included in the SBFD subband of the terminal are time-domain aligned, the corresponding timing advance can be determined to be 0 for the uplink transmission of full-duplex symbols. Furthermore, the UL subband and DL subband included in the SBFD subband of the terminal, and the IBFD subband and UL subband of the network-side device all adopt LCP.

[0176] For example, in the communication scenario shown in Figure 27, the UL subband and DL subband included in the SBFD subband of the terminal, and the IBFD subband and UL subband of the network-side device all use LCP. This is equivalent to using the time domain time occupied by the large cyclic prefix to make up for the transmission delay. For the uplink transmission of the full-duplex symbol of the terminal, the corresponding timing advance can be determined to be 0, that is, it is not necessary to perform uplink transmission a certain time in advance based on the downlink subframe reception time.

[0177] In one embodiment of this disclosure, both the terminal and the network-side device employ IBFD mode. Specifically, the terminal can be configured with both IBFD subbands and ordinary UL subbands, and the network-side device can be configured with both IBFD subbands and ordinary UL subbands. For uplink transmission of non-full-duplex symbols, the corresponding timing advance remains the second advance.

[0178] As shown in Figure 28, when the IBFD subband and the UL subband of the network-side device are not aligned in the time domain, the uplink transmission of the IBFD subband of the terminal can be deactivated. For the uplink transmission of full-duplex symbols, the corresponding timing advance can be determined as the second advance.

[0179] Because the IBFD subband and UL subband of the network-side device are not aligned in the time domain, the uplink transmission of the terminal needs to compensate for the transmit / receive conversion time of the network-side device. Therefore, the corresponding timing advance is determined as the second advance.

[0180] As shown in Figure 29, in the communication scenario shown in Figure 29, when the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned, the uplink transmission of the IBFD subband of the terminal is deenabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0181] For example, since the IBFD subband and the ordinary UL subband of the network-side device are aligned in the time domain, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first advance can be used.

[0182] Furthermore, for the same reasons as the communication scenario shown in Figure 28, the uplink transmission of the terminal's IBFD subband is disabled.

[0183] Referring to Figure 30, in the communication scenario shown in Figure 30, when the IBFD subband and UL subband of the network-side device are not aligned in the time domain, the downlink transmission of the IBFD subband of the terminal can be disabled. For the uplink transmission of the full-duplex symbol IBFD subband, the corresponding timing advance can be determined as the first advance. For the uplink transmission of the full-duplex symbol UL subband, the corresponding timing advance can be determined as the second advance.

[0184] For example, as shown in Figure 30, for uplink transmission of the full-duplex symbol IBFD subband, since the IBFD subband of the network-side device is delayed by one transmit / receive conversion time compared to the ordinary UL of the network-side device, the timing advance for uplink transmission of the full-duplex symbol IBFD subband is simply the first advance. For uplink transmission of the full-duplex symbol UL subband, the corresponding timing advance is the second advance, meaning that the timing advance needs to compensate for the transmit / receive conversion time.

[0185] As shown in Figure 31, in the communication scenario shown in Figure 31, the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned. In this case, the downlink transmission of the IBFD subband of the terminal can be disabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0186] For example, since the IBFD subband and UL subband of the network-side device are time-domain aligned, there is no difference in transmit / receive conversion time between them. Therefore, the time when the terminal sends uplink subframes does not need to compensate for the transmit / receive conversion time, that is, the first lead can be used.

[0187] As shown in Figure 32, in the communication scenario shown in Figure 32, when the IBFD subband and UL subband of the network-side device are time-domain aligned, and the IBFD subband and UL subband of the terminal are time-domain aligned, the timing advance for the uploading transmission of full-duplex symbols is 0, and the IBFD and UL subbands of the terminal and the IBFD and UL subbands of the network-side device all use LCP.

[0188] For example, in the communication scenario shown in Figure 32, the IBFD subband and UL subband of the terminal and the IBFD subband and UL subband of the network-side equipment all use LCP, which is equivalent to using the time domain time occupied by the large cyclic prefix to make up for the transmission delay. For the uplink transmission of the full-duplex symbol of the terminal, the corresponding timing advance can be determined to be 0, that is, it is not necessary to perform uplink transmission a certain time in advance based on the downlink subframe reception time.

[0189] In one embodiment of this disclosure, the use of a cyclic prefix (CP) or LCP for the terminal's downlink subband, uplink subband, and full-duplex subband is determined based on information sent by the network-side device.

[0190] For example, network-side devices can send information to terminals instructing them to use either CP or LCP for their downlink, uplink, and full-duplex subbands. This information can be carried in at least one of the following: Radio Resource Control (RRC) layer signaling, Radio Link Control (RLC) layer signaling, Media Access Controller (MAC) layer signaling, and Physical Layer (PHY) layer signaling.

[0191] In one embodiment of this disclosure, the terminal's downlink subband, uplink subband, and full-duplex subband adopt LCP based on at least one of the following events: time domain alignment of different subbands of the terminal.

[0192] For example, when different subbands of the terminal are time-domain aligned, the downlink subband, uplink subband and full-duplex subband of the terminal are triggered to use LCP, that is, the network-side device does not need to send indication information about LCP to the terminal.

[0193] In one embodiment of this disclosure, the duplex mode of the terminal and the network-side device is determined based on any of the following methods:

[0194] The terminal reports its supported duplex modes or duplex mode combinations to the network-side device to determine the duplex mode of the terminal and / or the network-side device; the duplex mode combination represents the combination of the terminal's duplex mode and the network-side device's duplex mode.

[0195] The terminal reports the desired duplex mode or combination of duplex modes to the network-side device to determine the duplex mode of the terminal and / or the network-side device.

[0196] Network-side devices configure the terminal's duplex mode or a combination of duplex modes.

[0197] The network-side device configures the duplex mode or duplex mode combination of the network-side device to the terminal.

[0198] The terminal is pre-configured with one duplex mode or a combination of duplex modes;

[0199] Network-side devices are pre-configured with one duplex mode or a combination of duplex modes.

[0200] The foregoing primarily describes the solutions of the embodiments of this disclosure from a methodological perspective. The following also illustrates a timing advance determination apparatus for executing the timing advance determination method in any of the above embodiments and their possible implementations. It is understood that the timing advance determination apparatus, in order to implement the timing advance determination method, includes hardware structures and / or software modules corresponding to the execution of each function; those skilled in the art should readily recognize that, in conjunction with the algorithm steps of the various examples described in the embodiments of this disclosure, this disclosure can be implemented in hardware or a combination of hardware and computer software. Whether a function is executed in hardware or by computer software driving hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0201] This disclosure embodiment can divide the timing advance determination device into functional modules according to the above method embodiment. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one functional module. The integrated module can be implemented in hardware or software. It should be noted that the module division in this disclosure embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. The following description uses the example of dividing each functional module according to each function.

[0202] Figure 33 shows a timing advance determination device 200 provided in an embodiment of the present disclosure. The timing advance determination device 200 includes a determination module 210.

[0203] The determination module 210 is used to determine the timing advance of the uplink transmission of the terminal based on the duplex mode of the terminal and the duplex mode of the network-side device.

[0204] In some embodiments, the duplex mode of the terminal includes at least one of the following: sub-band full-duplex SBFD mode, simultaneous same-frequency full-duplex IBFD mode, and non-full-duplex mode;

[0205] The duplex mode of the network-side device includes at least one of the following: the SBFD mode, the IBFD mode, and the non-full-duplex mode.

[0206] In some embodiments, the timing advance includes any one of the following: 0, a first advance and a second advance; the second advance includes the first advance and an advance determined based on the transmit / receive switching time of the network-side device;

[0207] In the case of a terrestrial network (TN), the first advance is determined based on the bidirectional transmission delay between the terminal and the network-side equipment.

[0208] In the case of a non-terrestrial network (NTN), the first advance amount, based on the first advance amount corresponding to the terrestrial network (TN), further includes: the bidirectional transmission delay between the terminal and the non-terrestrial network side equipment, and the bidirectional transmission delay between the non-terrestrial network side equipment and the first node; the first node includes at least one of the following: an NTN gateway, a terrestrial base station, and a reference point.

[0209] In some embodiments, the terminal adopts the non-full-duplex mode, and the network-side device adopts the non-full-duplex mode; the non-full-duplex mode includes frequency division duplex (FDD) mode and time division duplex (TDD) mode.

[0210] When both the terminal and the network-side device adopt FDD mode, the timing advance of the terminal's uplink transmission is determined as the first advance.

[0211] When both the terminal and the network-side device adopt TDD mode, the timing advance of the terminal's uplink transmission is determined as the second advance.

[0212] In some embodiments, the terminal adopts the SBFD mode, and the network-side device adopts the non-full-duplex mode;

[0213] The SBFD subband of the terminal includes a downlink DL subband and an uplink UL subband; the terminal communicates with a first network-side device through the DL subband and communicates with a second network-side device through the UL subband; or, the DL subband and the UL subband correspond to a first carrier and a second carrier, respectively.

[0214] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0215] In some embodiments, when the time domains of the data transmission and reception of the first network-side device and the second network-side device are not aligned, or when the time domains of the first carrier and the second carrier are not aligned, the timing advance for uplink transmission of a full-duplex symbol is the second advance.

[0216] In some embodiments, when the first network-side device and the second network-side device transmit and receive data in the time domain, or when the first carrier and the second carrier are in the time domain, the timing advance for uplink transmission of a full-duplex symbol is the first advance.

[0217] In some embodiments, when the first network-side device and the second network-side device transmit and receive data in the time domain aligned, or when the first carrier and the second carrier are in the time domain aligned, and the DL subband and UL subband included in the SBFD subband of the terminal are in the time domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and the UL subband included in the SBFD subband of the terminal and the UL subband of the second network-side device adopt a large cyclic prefix (LCP).

[0218] In some embodiments, the terminal adopts the IBFD mode, and the network-side device adopts the non-full-duplex mode;

[0219] The terminal's IFB subband is used to communicate with a third network-side device, and the terminal's UL subband is used to communicate with a fourth network-side device; or, the terminal's IFB subband corresponds to a third carrier, and the terminal's UL subband corresponds to a fourth carrier.

[0220] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0221] In some embodiments, if the time domains of the data transmission and reception of the third network-side device and the fourth network-side device are not aligned, or if the time domains of the third carrier and the fourth carrier are not aligned, the uplink transmission of the IBFD subband of the terminal is disabled. For the uplink transmission of the UL subband of the full-duplex symbol, the corresponding timing advance is the second advance.

[0222] In some embodiments, when the third network-side device and the fourth network-side device transmit and receive data in the time domain aligned, or when the third carrier and the fourth carrier are in the time domain aligned, the uplink transmission of the terminal's IBFD subband is disabled. For the uplink transmission of the UL subband with full-duplex symbols, the corresponding timing advance is the first advance.

[0223] In some embodiments, if the time domains of the data transmission and reception of the third network-side device and the fourth network-side device are not aligned, or if the time domains of the third carrier and the fourth carrier are not aligned, the downlink transmission of the IBFD subband of the terminal is disabled, and for the uplink transmission of full-duplex symbols, the corresponding timing advance is the second advance.

[0224] In some embodiments, when the third network-side device and the fourth network-side device transmit and receive data in the time domain aligned, or when the third carrier and the fourth carrier are in the time domain aligned, the downlink transmission of the terminal's IBFD subband is disabled, and for the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0225] In some embodiments, when the third network-side device and the fourth network-side device transmit and receive data in the time domain, or when the third carrier and the fourth carrier are in the time domain, and the terminal's IBFD subband and the terminal's UL subband are in the time domain, the corresponding timing advance for uplink transmission of full-duplex symbols is 0, and the terminal's IBFD subband, UL subband, and the fourth network-side device's UL subband all use LCP.

[0226] In some embodiments, the terminal adopts the non-full-duplex mode, and the network-side device adopts the SBFD mode;

[0227] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0228] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the corresponding timing advance for uplink transmission of full-duplex symbols is the second advance.

[0229] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

[0230] In some embodiments, the terminal adopts the SBFD mode, and the network-side device adopts the SBFD mode;

[0231] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0232] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the corresponding timing advance for uplink transmission of full-duplex symbols is the second advance.

[0233] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

[0234] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, and the UL subband and DL subband included in the SBFD subband of the terminal are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and both the UL subband included in the SBFD subband of the terminal and the UL subband included in the SBFD subband of the network-side device adopt LCP.

[0235] In some embodiments, the terminal adopts the IBFD mode, and the network-side device adopts the SBFD mode;

[0236] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0237] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the uplink transmission of the IBFD subband of the terminal is deactivated. For the uplink transmission of the UL subband with full-duplex symbol, the corresponding timing advance is the second advance.

[0238] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the uplink transmission of the IBFD subband of the terminal is deactivated. For the uplink transmission of the UL subband with full-duplex symbol, the corresponding timing advance is the first advance.

[0239] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the downlink transmission of the IBFD subband of the terminal is disabled, and for the uplink transmission of full-duplex symbols, the corresponding timing advance is the second advance.

[0240] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the downlink transmission of the IBFD subband of the terminal is deactivated, and for the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0241] In some embodiments, when the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, and the IBFD subband of the terminal and the UL subband of the terminal are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and the SBFD subband, UL subband of the terminal and the UL subband of the network-side device all adopt LCP.

[0242] In some embodiments, the terminal adopts the non-full-duplex mode, and the network-side device adopts the IBFD mode;

[0243] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0244] In some embodiments, when the IBFD subband and UL subband of the network-side device are not aligned in the time domain, the timing advance for uplink transmission of the IBFD subband with full-duplex symbol is the first advance; and the timing advance for uplink transmission of the UL subband with full-duplex symbol is the second advance.

[0245] In some embodiments, when the IBFD subband and the UL subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

[0246] In some embodiments, the terminal adopts the non-full-duplex mode, and the network-side device adopts the IBFD mode;

[0247] For uplink transmission of both non-full-duplex and full-duplex symbols, the corresponding timing advance is the first advance.

[0248] In some embodiments, the terminal adopts the SBFD mode, and the network-side device adopts the IBFD mode;

[0249] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0250] In some embodiments, when the IBFD subband and the UL subband of the network-side device are not time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the second advance.

[0251] In some embodiments, when the IBFD subband and the UL subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

[0252] In some embodiments, when the IBFD subband and the UL subband of the network-side device are time-domain aligned, and the UL subband and DL subband included in the SBFD subband of the terminal are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and the UL subband and DL subband included in the SBFD subband of the terminal, as well as the IBFD subband and UL subband of the network-side device, all adopt LCP.

[0253] In some embodiments, the terminal adopts the IBFD mode, and the network-side device adopts the IBFD mode;

[0254] For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

[0255] In some embodiments, when the IBFD subband and the UL subband of the network-side device are not time-domain aligned, the uplink transmission of the IBFD subband of the terminal is disabled. For uplink transmission of full-duplex symbols, the corresponding timing advance is the second advance.

[0256] In some embodiments, when the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned, the uplink transmission of the IBFD subband of the terminal is deactivated. For uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0257] In some embodiments, when the IBFD subband and the UL subband of the network-side device are not time-domain aligned, downlink transmission of the IBFD subband of the terminal is disabled. For uplink transmission of the full-duplex symbol IBFD subband, the corresponding timing advance is the first advance; for uplink transmission of the full-duplex symbol UL subband, the corresponding timing advance is the second advance.

[0258] In some embodiments, when the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned, downlink transmission of the IBFD subband of the terminal is deactivated, and for uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

[0259] In some embodiments, when the IBFD subband and UL subband of the network-side device are time-domain aligned, and the IBFD subband and UL subband of the terminal are time-domain aligned, the timing advance for the uploading transmission of full-duplex symbols is 0, and the IBFD and UL subbands of the terminal and the IBFD and UL subbands of the network-side device all adopt LCP.

[0260] In some embodiments, the use of a cyclic prefix (CP) or an LCP for the terminal's downlink subband, uplink subband, and full-duplex subband is determined based on information sent by the network-side device;

[0261] The information is carried in at least one of the following: Radio Resource Control (RRC) layer signaling, Radio Link Control (RLC) layer signaling, Media Access Controller (MAC) layer signaling, and Physical Layer (PHY) layer signaling.

[0262] In some embodiments, the terminal's downlink subband, uplink subband, and full-duplex subband adopt LCP based on at least one of the following events: time domain alignment of the different subbands of the terminal.

[0263] In some embodiments, the duplex mode of the terminal and the network-side device is determined based on any of the following methods:

[0264] The terminal reports its supported duplex modes or duplex mode combinations to the network-side device to determine the duplex mode of the terminal and / or the network-side device; the duplex mode combination represents the combination of the duplex mode of the terminal and the duplex mode of the network-side device.

[0265] The terminal reports the desired duplex mode or combination of duplex modes to the network-side device to determine the duplex mode of the terminal and / or the network-side device.

[0266] The network-side device configures the terminal with a duplex mode or a combination of duplex modes.

[0267] The network-side device configures the duplex mode or a combination of duplex modes of the network-side device to the terminal.

[0268] The terminal is pre-configured with one duplex mode or a combination of duplex modes;

[0269] The network-side device is pre-configured with a duplex mode or a combination of duplex modes.

[0270] In the case of implementing the functions of the integrated modules described above in hardware, this disclosure also provides a possible structure for a communication device used to execute the methods provided in this disclosure. As shown in FIG34, the communication device 100 includes: a communication interface 103, a processor 102, and a bus 104. Optionally, the communication device may further include a memory 101.

[0271] Processor 102 may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with embodiments of this disclosure. Processor 102 may be a central processing unit, a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. It may implement or execute various exemplary logic blocks, modules, and circuits described in conjunction with embodiments of this disclosure. Processor 102 may also be a combination of computing functions, such as a combination of one or more microprocessors, a digital signal processor (DSP), and a microprocessor, etc.

[0272] Communication interface 103 is used to connect with other devices via a communication network. This communication network can be Ethernet, wireless access network, wireless local area network (WLAN), etc.

[0273] The memory 101 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), disk storage medium or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but is not limited thereto.

[0274] As one possible implementation, the memory 101 can exist independently of the processor 102. The memory 101 can be connected to the processor 102 via a bus 104 and is used to store instructions or program code. When the processor 102 calls and executes the instructions or program code stored in the memory 101, it can implement the methods provided in the embodiments of this disclosure.

[0275] In another possible implementation, the memory 101 can also be integrated with the processor 102.

[0276] Bus 104 can be an extended industry standard architecture (EISA) bus, etc. Bus 104 can be divided into address bus, data bus, control bus, etc. For ease of representation, it is represented by only one thick line in Figure 34, but this does not mean that there is only one bus or one type of bus.

[0277] Some embodiments of this disclosure provide a computer-readable storage medium (e.g., a non-transitory computer-readable storage medium) storing computer program instructions that, when executed on a computer, cause the computer to perform the methods described in any of the above embodiments.

[0278] In one exemplary embodiment, the computer may be the aforementioned timing advance determination device, and this disclosure does not limit the specific form of the computer.

[0279] In some examples, the aforementioned computer-readable storage media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks, or magnetic tapes), optical discs (e.g., compact disks (CDs), digital versatile disks (DVDs), etc.), smart cards, and flash memory devices (e.g., erasable programmable read-only memory (EPROMs), cards, sticks, or key drives, etc.). The various computer-readable storage media described in this disclosure may represent one or more devices and / or other machine-readable storage media for storing information. The term "machine-readable storage media" may include, but is not limited to, wireless channels and various other media capable of storing, containing, and / or carrying instructions and / or data.

[0280] This disclosure provides a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods described in any of the above embodiments.

[0281] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any changes or substitutions within the technical scope disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A method for determining a time advance, wherein, The method includes: The timing advance of the terminal's uplink transmission is determined based on the duplex mode of the terminal and the duplex mode of the network-side equipment.

2. The method according to claim 1, wherein, The duplex mode of the terminal includes at least one of the following: sub-band full-duplex SBFD mode, simultaneous same-frequency full-duplex IBFD mode, and non-full-duplex mode; The duplex mode of the network-side device includes at least one of the following: the SBFD mode, the IBFD mode, and the non-full-duplex mode.

3. The method according to claim 2, wherein, The timing advance includes any one of the following: 0, a first advance and a second advance; the second advance includes the first advance and an advance determined based on the transmit / receive switching time of the network-side device; In the case of a terrestrial network (TN), the first advance is determined based on the bidirectional transmission delay between the terminal and the network-side equipment. In the case of a non-terrestrial network (NTN), the first advance amount, based on the first advance amount corresponding to the terrestrial network (TN), further includes: the bidirectional transmission delay between the terminal and the non-terrestrial network side device, and the bidirectional transmission delay between the non-terrestrial network side device and the first node. The first node includes at least one of the following: an NTN gateway, a ground base station, and a reference point.

4. The method according to claim 3, wherein, The terminal adopts the non-full-duplex mode, and the network-side equipment adopts the non-full-duplex mode; the non-full-duplex mode includes frequency division duplex (FDD) mode and time division duplex (TDD) mode. When both the terminal and the network-side device adopt FDD mode, the timing advance of the uplink transmission of the terminal is determined as the first advance. When both the terminal and the network-side device adopt TDD mode, the timing advance of the terminal's uplink transmission is determined as the second advance.

5. The method according to any one of claims 1 to 3, wherein, The terminal adopts the SBFD mode, and the network-side device adopts the non-full-duplex mode. The SBFD subband of the terminal includes a downlink DL subband and an uplink UL subband; the terminal communicates with a first network-side device through the DL subband and communicates with a second network-side device through the UL subband; or, the DL subband and the UL subband correspond to a first carrier and a second carrier, respectively. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

6. The method according to claim 5, wherein, When the time domains of the first network-side device and the second network-side device are not aligned, or when the time domains of the first carrier and the second carrier are not aligned, the timing advance for uplink transmission of a full-duplex symbol is the second advance.

7. The method according to claim 5, wherein, When the first network-side device and the second network-side device are time-domain aligned in transmitting and receiving data, or when the first carrier and the second carrier are time-domain aligned, the timing advance for uplink transmission of a full-duplex symbol is the first advance.

8. The method according to claim 5, wherein, When the first network-side device and the second network-side device have time-domain data transmission and reception alignment, or when the first carrier and the second carrier have time-domain alignment, and the DL subband and UL subband included in the SBFD subband of the terminal have time-domain data transmission and reception alignment, the corresponding timing advance for uplink transmission of full-duplex symbols is 0, and the UL subband included in the SBFD subband of the terminal and the UL subband of the second network-side device adopt the large cyclic prefix (LCP).

9. The method according to any one of claims 1 to 3, wherein, The terminal adopts the IBFD mode, and the network-side device adopts the non-full-duplex mode. The terminal's IFB subband is used to communicate with a third network-side device, and the terminal's UL subband is used to communicate with a fourth network-side device; or, the terminal's IFB subband corresponds to a third carrier, and the terminal's UL subband corresponds to a fourth carrier. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

10. The method according to claim 9, wherein, If the time domains of the data transmission and reception of the third network-side device and the fourth network-side device are not aligned, or if the time domains of the third carrier and the fourth carrier are not aligned, the uplink transmission of the IBFD subband of the terminal is disabled. For the uplink transmission of the UL subband of the full-duplex symbol, the corresponding timing advance is the second advance.

11. The method according to claim 9, wherein, When the third network-side device and the fourth network-side device are time-domain aligned in transmitting and receiving data, or when the third carrier and the fourth carrier are time-domain aligned, the uplink transmission of the terminal's IBFD subband is enabled. For uplink transmission of the UL subband with full-duplex symbol, the corresponding timing advance is the first advance.

12. The method according to claim 9, wherein, If the time domains of the data transmission and reception of the third network-side device and the fourth network-side device are not aligned, or if the time domains of the third carrier and the fourth carrier are not aligned, the downlink transmission of the IBFD subband of the terminal is disabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the second advance.

13. The method according to claim 9, wherein, When the third network-side device and the fourth network-side device have time-domain data transmission and reception aligned, or when the third carrier and the fourth carrier have time-domain alignment, the downlink transmission of the terminal's IBFD subband is disabled. For uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

14. The method according to claim 9, wherein, When the third network-side device and the fourth network-side device transmit and receive data in the time domain, or when the third carrier and the fourth carrier are in the time domain, and the terminal's IBFD subband and the terminal's UL subband are in the time domain, the corresponding timing advance for uplink transmission of full-duplex symbols is 0, and the terminal's IBFD subband, UL subband, and the fourth network-side device's UL subband all use LCP.

15. The method according to any one of claims 1 to 3, wherein, The terminal adopts the non-full-duplex mode, and the network-side device adopts the SBFD mode. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

16. The method according to claim 15, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the corresponding timing advance for uplink transmission of full-duplex symbols is the second advance.

17. The method according to claim 15, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

18. The method according to any one of claims 1 to 3, wherein, The terminal adopts the SBFD mode, and the network-side device adopts the SBFD mode; For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

19. The method according to claim 18, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the corresponding timing advance for uplink transmission of full-duplex symbols is the second advance.

20. The method according to claim 18, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

21. The method according to claim 18, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, and the UL subband and DL subband included in the SBFD subband of the terminal are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and both the UL subband included in the SBFD subband of the terminal and the UL subband included in the SBFD subband of the network-side device adopt LCP.

22. The method according to any one of claims 1 to 3, wherein, The terminal uses the IBFD mode, and the network-side device uses the SBFD mode. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

23. The method according to claim 22, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the uplink transmission of the IBFD subband of the terminal is disabled. For the uplink transmission of the UL subband with full-duplex symbol, the corresponding timing advance is the second advance.

24. The method according to claim 22, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the uplink transmission of the IBFD subband of the terminal is deactivated. For the uplink transmission of the UL subband with full-duplex symbol, the corresponding timing advance is the first advance.

25. The method according to claim 22, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are not time-domain aligned, the downlink transmission of the IBFD subband of the terminal is disabled. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the second advance.

26. The method according to claim 22, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, the downlink transmission of the IBFD subband of the terminal is deactivated. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

27. The method according to claim 22, wherein, When the UL subband and DL subband included in the SBFD subband of the network-side device are time-domain aligned, and the IBFD subband of the terminal and the UL subband of the terminal are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and the SBFD subband, UL subband of the terminal and the UL subband of the network-side device all adopt LCP.

28. The method according to any one of claims 1 to 3, wherein, The terminal adopts the non-full-duplex mode, and the network-side device adopts the IBFD mode. For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

29. The method according to claim 28, wherein, When the IBFD subband and UL subband of the network-side device are not aligned in the time domain, the timing advance for uplink transmission of the full-duplex symbol IBFD subband is the first advance; the timing advance for uplink transmission of the full-duplex symbol UL subband is the second advance.

30. The method according to claim 28, wherein, When the IBFD subband and the UL subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

31. The method according to any one of claims 1 to 3, wherein, The terminal adopts the non-full-duplex mode, and the network-side device adopts the IBFD mode. For uplink transmission of both non-full-duplex and full-duplex symbols, the corresponding timing advance is the first advance.

32. The method according to any one of claims 1 to 3, wherein, The terminal uses the SBFD mode, and the network-side device uses the IBFD mode; For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

33. The method according to claim 32, wherein, When the IBFD subband and the UL subband of the network-side device are not aligned in the time domain, the timing advance for uplink transmission of full-duplex symbols is the second advance.

34. The method according to claim 32, wherein, When the IBFD subband and the UL subband of the network-side device are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is the first advance.

35. The method according to claim 32, wherein, When the IBFD subband and UL subband of the network-side device are time-domain aligned, and the UL subband and DL subband included in the SBFD subband of the terminal are time-domain aligned, the timing advance for uplink transmission of full-duplex symbols is 0, and the UL subband and DL subband included in the SBFD subband of the terminal, as well as the IBFD subband and UL subband of the network-side device, all adopt LCP.

36. The method according to any one of claims 1 to 3, wherein, The terminal adopts the IBFD mode, and the network-side device adopts the IBFD mode; For uplink transmission of non-full-duplex symbols, the corresponding timing advance is the second advance.

37. The method of claim 36, wherein, When the IBFD subband and the UL subband of the network-side device are not aligned in the time domain, the uplink transmission of the IBFD subband of the terminal is disabled. For uplink transmission of full-duplex symbols, the corresponding timing advance is the second advance.

38. The method according to claim 36, wherein, When the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned, the uplink transmission of the IBFD subband of the terminal is enabled. For uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

39. The method according to claim 36, wherein, When the IBFD subband and the UL subband of the network-side device are not aligned in the time domain, the downlink transmission of the IBFD subband of the terminal is disabled. For the uplink transmission of the full-duplex symbol IBFD subband, the corresponding timing advance is the first advance. For the uploading transmission of UL subbands with full-duplex symbols, the corresponding timing advance is the second advance.

40. The method of claim 36, wherein, When the IBFD subband of the network-side device and the UL subband of the network-side device are time-domain aligned, the downlink transmission of the IBFD subband of the terminal is deactivated. For the uplink transmission of full-duplex symbols, the corresponding timing advance is the first advance.

41. The method according to claim 36, wherein, When the IBFD subband and UL subband of the network-side device are time-domain aligned, and the IBFD subband and UL subband of the terminal are time-domain aligned, the timing advance for full-duplex symbol upload transmission is 0, and the IBFD and UL subbands of the terminal and the IBFD and UL subbands of the network-side device all use LCP.

42. The method according to any one of claims 1 to 41, wherein, The use of cyclic prefix (CP) or LCP for the terminal's downlink subband, uplink subband, and full-duplex subband is determined based on information sent by the network-side equipment. The information is carried in at least one of the following: Radio Resource Control (RRClayer) signaling, Radio Link Control (RLClayer) signaling, Media Access Controller (MAClayer) signaling, and Physical Layer (PHYlayer) signaling.

43. The method according to any one of claims 1 to 41, wherein, The adoption of LCP in the terminal's downlink subband, uplink subband, and full-duplex subband is triggered by at least one of the following events: time domain alignment of the different subbands of the terminal.

44. The method according to any one of claims 1 to 43, wherein, The duplex mode of the terminal and the network-side device is determined based on any of the following methods: The terminal reports its supported duplex modes or duplex mode combinations to the network-side device to determine the duplex mode of the terminal and / or the network-side device; the duplex mode combination represents the combination of the duplex mode of the terminal and the duplex mode of the network-side device. The terminal reports the desired duplex mode or duplex mode combination to the network-side device to determine the duplex mode of the terminal and / or the network-side device. The network-side device configures the terminal with a duplex mode or a combination of duplex modes. The network-side device configures the duplex mode or a combination of duplex modes of the network-side device to the terminal. The terminal is pre-configured with one duplex mode or a combination of duplex modes; The network-side device is pre-configured with a duplex mode or a combination of duplex modes.

45. A communication device, wherein, include: A processor and a memory for storing instructions executable by the processor; When the processor is configured to execute the instructions, the communication device performs the method as described in any one of claims 1-44.

46. ​​A computer-readable storage medium, wherein, The computer-readable storage medium stores computer program instructions that, when executed on a computer, cause the computer to perform the method as described in any one of claims 1-44, wherein the computer-readable storage medium includes a non-transitory computer-readable storage medium.

47. A computer program product, wherein, It includes computer-readable program medium code stored thereon, which, when executed by a processor, causes the processor to perform the method according to any one of claims 1-44.

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