Timing advance determination method, terminal, and network side device

Abstract

The present application relates to the field of communications, and discloses a timing advance (TA) determination method, a terminal, and a network side device. The TA determination method comprises: a terminal acquires a TA on the basis of first information, wherein the first information comprises the value of the TA and / or information used for determining the TA, and the TA is a TA between an uplink and a downlink, or the TA is a TA between the uplink and the global navigation satellite system (GNSS).

Description

Method for determining timing advance, terminal and network side device

[0001] Cross-reference to related applications

[0002] This application claims priority to the Chinese patent application No. 202411123709.0, filed on August 15, 2024, and entitled "Method for determining timing advance, terminal and network side device", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application belongs to the field of communication technology, and specifically relates to a method for determining timing advance, a terminal and a network side device. BACKGROUND

[0004] In non-terrestrial network (NTN) communication, a terminal (User Equipment, UE) can obtain wireless resources through a satellite to expand the coverage of the network. In NTN communication, in order to ensure that the uplink frame i and the downlink frame i are aligned at the reference point (RP), the uplink frame i needs to be advanced by a certain amount of time compared to the corresponding downlink frame i, and this amount of time is the timing advance (TA).

[0005] The timing advance of the uplink frame sent by the UE includes the time compensation between the UE and the satellite and the time compensation between the satellite and the RP. In related technologies, the time compensation between the UE and the satellite is determined according to the position of the UE and the ephemeris information of the satellite. The UE usually obtains the ephemeris information from the network side device through system information (SI).

[0006] The ephemeris information obtained by the UE from the network side device has a validity period. Within this validity period, the UE can calculate the time compensation between the UE and the satellite based on the ephemeris information to determine the TA. However, beyond the validity period, the UE needs to reacquire the ephemeris information and calculate the time compensation between the UE and the satellite to determine the TA. Since the ephemeris information is usually large and the capacity of the SI is limited, the number of ephemeris information that can be sent at one time is also limited, so the UE needs to frequently acquire the ephemeris information. The UE frequently acquires the ephemeris information, which increases the power consumption of the UE and also reduces the spectral efficiency in the system.

[0007] Therefore, it is urgent to propose a method for determining the timing advance that does not depend on the ephemeris information to avoid the problems caused by frequent acquisition of ephemeris information. SUMMARY

[0008] In a first aspect, a method for determining timing advance is provided. The method comprises: obtaining, by a terminal, a timing advance (TA) according to first information, wherein the first information comprises a value of the TA and / or information used for determining the TA, and the TA is between uplink and downlink or the TA is between uplink and global navigation satellite system (GNSS).

[0009] In a second aspect, a method for communication is provided. The method comprises: sending, by a network side device, first information to a terminal, wherein the first information comprises a value of the TA and / or information used for determining the value of the TA, and the TA is between uplink and downlink or the TA is between uplink and global navigation satellite system (GNSS).

[0010] In a third aspect, a device for determining timing advance is provided. The device comprises: a TA obtaining module configured to obtain a timing advance (TA) according to first information, wherein the first information comprises a value of the TA and / or information used for determining the value of the TA, and the TA is between uplink and downlink or the TA is between uplink and global navigation satellite system (GNSS).

[0011] In a fourth aspect, a device for communication is provided. The device comprises: an information sending module configured to send first information to a terminal, wherein the first information comprises a value of the TA and / or information used for determining the value of the TA, and the TA is between uplink and downlink or the TA is between uplink and global navigation satellite system (GNSS).

[0012] In a fifth aspect, a device for determining timing advance is provided. The device is configured to perform the steps of the method according to the first aspect.

[0013] In a sixth aspect, a terminal is provided. The terminal comprises a processor and a memory. The memory stores programs or instructions executable on the processor. When the programs or instructions are executed by the processor, the steps of the method according to the first aspect are implemented.

[0014] In a seventh aspect, a terminal is provided. The terminal comprises a processor and a communication interface. The processor is configured to obtain a timing advance (TA) according to first information, wherein the first information comprises a value of the TA and / or information used for determining the TA, and the TA is between uplink and downlink or the TA is between uplink and global navigation satellite system (GNSS).

[0015] In an eighth aspect, a network side device is provided. The network side device comprises a processor and a memory. The memory stores programs or instructions executable on the processor. When the programs or instructions are executed by the processor, the steps of the method according to the second aspect are implemented.

[0016] In a ninth aspect, a network-side device is provided, comprising a processor and a communication interface, wherein the communication interface is configured to send first information to a terminal, wherein the first information comprises a value of the TA and / or information used to determine the value of the TA, the TA being a TA between uplink and downlink, or the TA being a TA between uplink and Global Navigation Satellite System (GNSS).

[0017] In a tenth aspect, a readable storage medium is provided, wherein a program or instruction is stored on the readable storage medium, and the program or instruction is executed by a processor to implement the steps of the method according to the first aspect or the steps of the method according to the second aspect.

[0018] In an eleventh aspect, a wireless communication system is provided, comprising a terminal configured to implement the steps of the method according to the first aspect, and a network-side device configured to implement the steps of the method according to the second aspect.

[0019] In a twelfth aspect, a chip is provided, comprising a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is configured to run a program or instruction to implement the method according to the first aspect or the method according to the second aspect.

[0020] In a thirteenth aspect, a computer program / program product is provided, wherein the computer program / program product is stored in a storage medium, and the computer program / program product is executed by at least one processor to implement the steps of the method according to the first aspect.

[0021] In the embodiments of the present application, the TA can be obtained according to the first information, since the first information comprises the value of the TA and / or information used to determine the value of the TA, the first information does not contain ephemeris information, so that the dependence on ephemeris information can be eliminated when determining the TA, thereby avoiding frequent acquisition of ephemeris information, and further reducing UE power consumption and improving spectrum efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a schematic diagram of an architecture of a wireless communication system to which embodiments of the present application can be applied.

[0023] FIG. 2 is a schematic diagram of an architecture of a Non-Terrestrial Network (NTN) to which embodiments of the present application can be applied.

[0024] FIG. 3 is a schematic diagram of a method for determining timing advance according to an embodiment of the present application.

[0025] FIG. 4 is a schematic diagram of a timing relationship in an NTN according to an embodiment of the present application.

[0026] FIG. 5 is a schematic diagram of a timing relationship in an NTN according to another embodiment of the present application.

[0027] FIG. 6 is a schematic diagram of a method for determining timing advance according to another embodiment of the present application.

[0028] FIG. 7 is a schematic diagram of a mobile cell in an NTN according to an embodiment of the present application.

[0029] FIG. 8 is a schematic diagram of a device for determining timing advance according to an embodiment of the present application.

[0030] FIG. 9 is a schematic diagram of a communication device according to another embodiment of the present application.

[0031] FIG. 10 is a schematic diagram of a communication device according to an embodiment of the present application.

[0032] FIG. 11 is a schematic diagram of a terminal according to an embodiment of the present application.

[0033] FIG. 12 is a schematic diagram of a network-side device according to an embodiment of the present application. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0035] The terms “first”, “second”, and the like in the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than that illustrated or described herein, and the objects distinguished by “first”, “second” are generally of a kind, and are not limited to the number of objects, for example, the first object can be one or more. In addition, “or” in the present application means at least one of the connected objects. For example, the protection scope of “A or B” at least covers three schemes, namely, scheme one: including A and not including B; scheme two: including B and not including A; scheme three: including A and B. In addition, the terms “A and / or B”, “at least one of A and B”, “at least one of A or B” also at least cover the above three schemes, respectively. The character “ / ” generally represents that the objects before and after are in an “or” relationship.

[0036] The term "indication" in this application can be either a direct indication (or explicit indication) or an indirect indication (or implicit indication). The direct indication can be understood as that the sender explicitly informs the receiver of specific information, operations to be performed or requested results, etc. in the sent indication. The indirect indication can be understood as that the receiver determines the corresponding information according to the indication sent by the sender, or makes a judgment and determines the operations to be performed or the requested results according to the judgment result.

[0037] It is worth noting that the technology described in the embodiments of the present application is not limited to Long Term Evolution (LTE) / LTE-Advanced (LTE-A) systems, but can also be used in other wireless communication systems, such as Code Division Multiple Access (CDMA), Time Division Multiple Access (TDMA), Frequency Division Multiple Access (FDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single-carrier Frequency-Division Multiple Access (SC-FDMA) or other systems. The terms "system" and "network" in the embodiments of the present application are often used interchangeably, and the described technology can be used in the above-mentioned systems and radio technologies, as well as other systems and radio technologies. The following description describes a New Radio (NR) system for example purposes, and NR terminology is used in most of the following description, but these technologies can also be applied to systems other than the NR system, such as a 6th Generation (6G) communication system. The present application is not limited to the case where no or little ephemeris information is obtained, and is also applicable to the case where the terminal obtains ephemeris information or the case where ephemeris information is normally obtained.

[0038] FIG. 1 shows a block diagram of a wireless communication system to which embodiments of the present application can be applied. The wireless communication system includes a terminal 11 and a network-side device 12. The terminal 11 can be a terminal-side device such as a mobile phone, a Tablet Personal Computer, a Laptop Computer, a notebook computer, a Personal Digital Assistant (PDA), a palmtop computer, a netbook, an Ultra-mobile Personal Computer (UMPC), a Mobile Internet Device (MID), an Augmented Reality (AR) device, a Virtual Reality (VR) device, a robot, a wearable device, a flight vehicle, a Vehicle User Equipment (VUE), a shipboard device, a Pedestrian User Equipment (PUE), a smart home (a home device with a wireless communication function such as a refrigerator, a television, a washing machine, or furniture), a game console, a Personal Computer (PC), a kiosk, or a self-service machine. The wearable device includes a smart watch, a smart bracelet, a smart earphone, smart glasses, smart jewelry (a smart bracelet, a smart necklace, a smart ring, a smart necklace, a smart anklet, a smart necklace, etc.), a smart wristband, smart clothes, etc. The vehicle-mounted device can also be referred to as a vehicle-mounted terminal, a vehicle-mounted controller, a vehicle-mounted module, a vehicle-mounted component, a vehicle-mounted chip, or a vehicle-mounted unit, etc. It should be noted that the specific type of the terminal 11 is not limited in the embodiments of the present application. The network-side device 12 can include an access network device or a core network device. The access network device can also be referred to as a Radio Access Network (RAN) device, a radio access network function, or a radio access network unit. The access network device can include a base station, a Wireless Local Area Network (WLAN) Access Point (AP), or a Wireless Fidelity (WiFi) node, etc.The base station can be referred to as a Node B (NB), an evolved Node B (eNB), a next generation Node B (gNB), a New Radio Node B (NR Node B), an access point, a relay station (RBS), a serving base station (SBS), a base transceiver station (BTS), a radio base station, a radio transceiver, a basic service set (BSS), an extended service set (ESS), a home Node B (HNB), a home evolved Node B, a transmit / receive point (TRP), or some other suitable terminology in the art, and is not limited to a particular technical terminology, provided that the same technical effect is achieved. It should be noted that in the embodiments of the present application, only the base station in the NR system is taken as an example for introduction, and the specific type of the base station is not limited.

[0039] The core network device can also be referred to as a core network node, a core network function, or a core network network element, etc., which includes but is not limited to at least one of the following: a mobility management entity (MME), an access and mobility management function (AMF), a session management function (SMF), a user plane function (UPF), a policy control function (PCF), a policy and charging rules function (PCRF), an edge application server discovery function (EASDF), a unified data management (UDM), a unified data repository (UDR), a home subscriber server (HSS), a centralized network configuration (CNC), a network repository function (NRF), a network exposure function (NEF), a local NEF (L-NEF), a binding support function (BSF), an application function (AF), a location management function (LMF), a gateway mobile location center (GMLC), a network data analytics function (NWDAF), etc. It should be noted that only the core network device in the NR system is taken as an example for introduction in the embodiments of the present application, and the specific type of the core network device is not limited. If the name of the core network device mentioned in the embodiments of the present application changes in the subsequent protocol version (for example, 6G), it is also within the protection scope of the present application.

[0040] Optionally, the core network device can be implemented by one or more function modules in one device, or can be implemented by multiple devices jointly, and the embodiments of the present application do not make a specific limitation in this regard. It can be understood that the above function modules can be network elements in a hardware device, can be software function modules running on a dedicated hardware, or can be virtualized function modules instantiated on a platform (for example, a cloud platform).

[0041] In order to reduce the dependence on ephemeris information when determining the timing advance, thereby avoiding the problems caused by frequent acquisition of ephemeris information, the embodiments of the present application propose a method for determining the timing advance. The method for determining the timing advance proposed in the embodiments of the present application can be applied to a non-terrestrial network (Non-Terrestrial Network, NTN) and can also be applied to a terrestrial network (Terrestrial Network, TN).

[0042] First, the architecture of an NTN to which the embodiments of the present application can be applied will be described in conjunction with FIG. 2. As shown in FIG. 2, the NTN can include a terminal (User Equipment, UE) 21, a satellite 22, a service gateway 23, and a base station 24, wherein the satellite can also be referred to as an Uncrewed Aerial System (UAS), the service gateway 23 can also be referred to as a Reference Point (RP) or a ground service station, and the service gateway 23 and the base station 24 can be regarded as network side devices.

[0043] In the NTN shown in FIG. 2:

[0044] - The feeder link is a wireless link between the service gateway 23 and the satellite 22;

[0045] - The service link is a wireless link between the terminal 21 and the satellite 22;

[0046] - The satellite 22: The main satellite payload at present is a transparent payload, including radio frequency filtering, frequency conversion and amplification, etc., that is, the satellite 22 can only realize transparent forwarding of signals and will not further process the signals, for example, will not demodulate or decode. The satellite 22 can usually generate multiple elliptical beams in a specific area to cover a range of several hundred kilometers.

[0047] - The satellite 22 provides communication services for the terminal 21 in a target service area.

[0048] With reference to the accompanying drawings, the determination method of timing advance provided by the embodiments of the present application will be described in detail in combination with some embodiments and application scenarios.

[0049] As shown in FIG. 3, the determination method of timing advance provided by an embodiment of the present application can include the following steps.

[0050] In step 301, a terminal acquires timing advance (TA) according to first information, wherein the first information includes a value of the TA and / or information used for determining the TA.

[0051] The TA can include at least one of the following:

[0052] Timing advance between uplink and downlink (TA);

[0053] The TA is the TA between uplink and global navigation satellite system (GNSS). Alternatively, the TA can be the TA between uplink and a first time t determined by GNSS. Optionally, t is absolute time, or t is downlink time acquired according to GNSS, or t is uplink time acquired according to GNSS.

[0054] More specifically, the TA can be one of the following cases:

[0055] 1) Compensation TA of uplink (UL) compared with downlink (DL), wherein TA = round trip time (RTT);

[0056] 2) Compensation 2*TA of uplink compared with downlink, wherein TA = propagation delay (PD), or TA = RTT / 2;

[0057] 3) Compensation TA of uplink compared with downlink, wherein TA = PD, or TA = RTT / 2;

[0058] 4) Compensation TA of uplink compared with GNSS, wherein TA = PD, or TA = RTT / 2.

[0059] The first information can be acquired according to at least one of the following:

[0060] Protocol definition;

[0061] The network-side device configures;

[0062] The network-side device indicates.

[0063] In some embodiments, the TA can include at least one of:

[0064] The first TA is one of a cell-specific TA, a beam-specific TA, a beam common TA, a region-specific TA, and a region common TA; or the first TA is a TA from a reference location to the network-side device;

[0065] The second TA is a UE-specific common TA, or the second TA is a TA from the reference location to the satellite;

[0066] The third TA is a Common TA, or the third TA is a TA from the satellite to the network-side device;

[0067] The fourth TA is a UE-specific TA, or the fourth TA is a TA from the terminal to the satellite;

[0068] The fifth TA is a TA indicated by a MAC CE, or the fifth TA includes a TA indicated by a timing advance command (TAC) and / or a TA indicated by a random access response (RAR).

[0069] The network-side device includes a reference point (RP) or a base station.

[0070] In some detailed embodiments, the first TA is a TA from a reference location to the network-side device, specifically, the first TA can be one of:

[0071] A TA from the reference location to the satellite to the RP, wherein the RP can also be a base station;

[0072] A TA from the reference location to the satellite to the RP to the base station;

[0073] A TA from the reference location to the satellite;

[0074] TA of the reference location to RP, wherein RP can also be a base station.

[0075] Wherein RP can be on a satellite, or RP can be on a base station, or RP is between the terminal and the satellite, or RP is between the satellite and the base station.

[0076] In some embodiments, the first information can include at least one of the following:

[0077] 1) TA reference value;

[0078] 2) TA reference value corresponding to reference time, wherein the TA reference value includes one value or multiple values, and the reference time includes one time or multiple times;

[0079] 3) TA reference value corresponding to reference location, wherein the TA reference value includes one value or multiple values, and the reference location includes one location or multiple locations;

[0080] 4) TA reference value corresponding to reference time and reference location, wherein the TA reference value includes one value or multiple values, the reference time includes one time or multiple times, and the reference location includes one location or multiple locations;

[0081] 5) TA rate, including at least one of first-order rate, second-order rate and third-order rate.

[0082] Further, in some embodiments, step 301 can include that the terminal acquires the TA according to the first information and / or the first time.

[0083] In one case, the terminal can acquire the TA according to the first information.

[0084] In another case, the terminal can acquire the TA according to the first information and the first time.

[0085] Wherein the first time t can be determined according to at least one of the following:

[0086] 1) acquired by the terminal according to GNSS;

[0087] 2) determined by the terminal according to Synchronization Signal Block (SSB);

[0088] 3) determined by the terminal according to Channel State Information-Reference Signal (CSI-RS);

[0089] 4) The terminal acquires the TA according to first configuration information, wherein the first configuration information comprises at least one of the following: a system information block (SIB), a master information block (MIB), a radio resource control message (RRC), a media access control control element (MAC CE), and downlink control information (DCI). For example, the first time t can be a broadcast time t in a SIB-x (e.g., SIB 19) and / or a difference value. Accordingly, the terminal can determine the TA according to the broadcast time t and the difference value.

[0090] 5) Network-side device acquisition. For example, the first time is a time t acquired by a base station / satellite.

[0091] 6) A transmission time of uplink transmission.

[0092] 7) The terminal acquires the TA according to a resource carrying uplink transmission. The resource can be a time of a first resource carrying uplink transmission, or a time of an Nth resource in the resource carrying uplink transmission.

[0093] Further, in the first implementation, the first information comprises a TA reference value and a TA change rate, and the terminal acquires the TA according to the first information and / or the first time, comprising:

[0094] The terminal determines the TA according to the TA reference value, the TA change rate, and the first time.

[0095] Optionally, the TA reference value is a TA reference value corresponding to a first reference time t0, or the TA reference value is a TA reference value of a first reference position at a first reference time t0.

[0096] In the second implementation, the first information comprises a first list and a TA change rate, and the first list comprises a plurality of TA reference values of a plurality of reference positions at a first reference time, or the first list comprises a plurality of TA reference values corresponding to a plurality of reference positions. The terminal acquires the TA according to the first information and / or the first time, comprising: the terminal determines the TA according to a TA reference value corresponding to a second reference position in the first list, the TA change rate, and the first time, wherein the second reference position is one of the plurality of reference positions.

[0097] It should be noted that, in the above first list and other TA reference value lists below, the correspondence between the reference position and the TA reference value can include at least one of the following:

[0098] One reference position can correspond to one TA reference value;

[0099] One reference position can correspond to multiple TA reference values;

[0100] Multiple reference positions correspond to one TA reference value;

[0101] Multiple reference positions correspond to multiple TA reference values.

[0102] In a third implementation, the first information includes a first list, the first list includes multiple TA reference values of multiple reference positions at a first reference time, or the first list includes multiple TA reference values corresponding to multiple reference positions, wherein the terminal acquires the TA according to the first information and / or the first time, including: the terminal determines the TA according to the reference value corresponding to the second reference position in the first list, wherein the second reference position is one of the multiple reference positions.

[0103] Exemplarily, if the TA includes the first TA, and the first TA is a cell-specific TA (cell-specific TA), the multiple reference positions can be represented as RL0, RL1, …, RL(M-1) respectively, M is an integer greater than 1, and the first list can be as shown in Table 1.

[0104] Table 1 cell-specific TA reference value list of multiple reference positions at a first reference time t0

[0105] In a fourth implementation, the first information includes a second list, the second list includes multiple TA reference values of a first reference position at multiple reference times, wherein the terminal acquires the TA according to the first information and / or the first time, including:

[0106] The terminal determines a second reference time according to the first time, wherein the second reference time is one of the multiple reference times;

[0107] The terminal determines the TA according to the TA reference value corresponding to the second reference time in the second list.

[0108] Alternatively, the second list includes TA reference values at multiple reference times, wherein the terminal acquires the TA according to the first information and / or the first time, including:

[0109] The terminal determines the TA according to a TA reference value corresponding to a second reference time in the second list, wherein the second reference time is one of the multiple reference times.

[0110] Exemplarily, if the TA includes the first TA and the first TA is a cell-specific TA, the multiple reference times can be represented as t0, t1, …, tN respectively, and N is an integer greater than 0, the first list can be shown in Table 2.

[0111] Table 2: cell-specific TA reference value list of first reference position at multiple reference times

[0112] In the fifth implementation, the first information includes a third list, and the third list includes multiple TA reference values of multiple reference positions at multiple reference times, wherein the terminal acquires the TA according to the first information and / or a first time, including:

[0113] The terminal determines a second reference time according to the first time, wherein the second reference time is one of the multiple reference times.

[0114] The terminal determines the TA according to a TA reference value of a second reference position at the second reference time in the third list, wherein the second reference position is one of the multiple reference positions.

[0115] Exemplarily, if the TA includes the first TA and the first TA is a cell-specific TA, the multiple reference times can be represented as t0, t1, …, tN respectively, and N is an integer greater than 0, the multiple reference positions can be represented as RL0, RL1, …, RL(M-1) respectively, and M is an integer greater than 1, the third list can be shown in Table 3.

[0116] Table 3: cell-specific TA reference value list of multiple reference positions at multiple reference times

[0117] In the above implementation, the multiple reference times can include at least one of the following: a time configured by a network-side device, a time in service cell information configured by a network-side device, a time in neighbor cell information configured by a network-side device, a time when the terminal receives the first information, a GNSS time when the terminal receives the first information, and a downlink time when the terminal receives the first information.

[0118] In the above embodiments, the plurality of reference locations comprises at least one of: a location configured by the network-side device, a location in a serving cell configured by the network-side device, a location in a neighboring cell configured by the network-side device, a predefined cell center location, and a location determined according to a predefined rule.

[0119] Further, in the above fourth and fifth embodiments, the second reference time satisfies at least one of:

[0120] a time in the plurality of reference times that is closest to the first time;

[0121] a time in the plurality of reference times that is closest to the first time;

[0122] a time in the plurality of reference times that is closest to the first time.

[0123] Further, in the above second, third and fifth embodiments, the second reference location satisfies any one of:

[0124] a reference location in the plurality of reference locations that is closest to the terminal;

[0125] one of the reference locations in the plurality of reference locations that has a distance to the terminal less than or equal to a first distance threshold;

[0126] the first reference location is determined according to an index of second configuration information received by the terminal, wherein the index of the second configuration information comprises at least one of: a beam ID, an SSB index, and a CSI-RS index.

[0127] wherein the first distance threshold can be obtained by at least one of:

[0128] a protocol definition;

[0129] a network-side device configuration;

[0130] a network-side device indication.

[0131] wherein the location of the terminal can be obtained by at least one of:

[0132] the terminal acquires according to GNSS;

[0133] the terminal acquires according to a positioning measurement, wherein the positioning measurement can be triggered by a network-side device or triggered by the terminal;

[0134] the network-side device acquires.

[0135] Further, in the above embodiments, the representation of the reference location can include any one of the following (e.g. RL0, RL1, …, RL(M-1) can be any one of the following):

[0136] longitude and latitude coordinates;

[0137] longitude and latitude coordinates and an altitude, which can be an altitude above sea level;

[0138] a third reference location (e.g. RL0) of the plurality of reference locations can be represented by longitude and latitude coordinates, and a fourth reference location (e.g. RL1, …, RL(M-1)) of the plurality of reference locations can be represented by a value determined by a longitude interval or a distance interval of the fourth reference location relative to the third reference location.

[0139] wherein the determination of the longitude interval or the distance interval includes at least one of the following:

[0140] a protocol definition;

[0141] a configuration of a network-side device;

[0142] an indication of a network-side device;

[0143] a value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identifier, an orbit identifier, and a distance between satellites on an orbit.

[0144] Further, in the above embodiments, the representation of the reference time can include any one of the following:

[0145] Coordinated Universal Time (UTC);

[0146] an earliest time (e.g. t0) of a plurality of reference times (e.g. t0, t1, …, tN) is UTC, and other times (e.g. t1, …, tN) of the plurality of reference times are values determined by a first time interval of the time relative to the earliest time;

[0147] the plurality of reference times are system frame number (SFN) times, wherein the SFN times are times determined by timing advance according to SSB.

[0148] wherein the determination of the first time interval can include at least one of the following:

[0149] a protocol definition;

[0150] a configuration of a network-side device;

[0151] an indication of a network-side device;

[0152] a value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identity, an orbit identity, and a distance between satellites on an orbit.

[0153] In some embodiments, the first information comprises a TA reference value, and the step 301 can comprise: determining the TA according to the TA reference value.

[0154] Optionally, the TA reference value is a TA reference value corresponding to a first reference time, or the TA reference value is a TA reference value corresponding to a first reference location at the first reference time.

[0155] In some embodiments, the first information indicates that the TA is a preset value, and the step 301 can comprise: determining the TA according to the preset value.

[0156] Optionally, in any of the above embodiments, the first information further comprises a fifth TA, and the method shown in FIG. 3 can further comprise: compensating the TA according to the fifth TA.

[0157] In the embodiments of the present application, the first reference time t0 comprises at least one of: a time configured by a network side device, a time in cell information configured by a network side device, a time in neighbor cell information configured by a network side device, a time when the terminal receives the first information, a GNSS time when the terminal receives the first information, and a downlink time when the terminal receives the first information; and the first reference location comprises at least one of: a location configured by a network side device, a location in a cell configured by a network side device, a location in a neighbor cell configured by a network side device, a predefined cell center location, and a location determined according to a predefined rule.

[0158] The following will illustrate how to obtain the TA according to the above embodiments through two specific scenarios.

[0159] Scenario one: the TA comprises a first TA, and the first TA is a cell-specific TA.

[0160] For example, as shown in FIG. 4, the first TA is a TA from the reference location 25 to the satellite 22 and then to the RP 23.

[0161] In the first implementation, if the first information includes a cell-specific TA reference value and a cell-specific TA change rate, the terminal acquires the TA according to the first information and / or the first time t, including: the terminal determines the cell-specific TA according to the cell-specific TA reference value, the cell-specific TA change rate and the first time.

[0162] The cell-specific TA reference value is a cell-specific TA corresponding to a first reference time t0 and a first reference position.

[0163] The cell-specific TA change rate includes at least one of the following: a first-order change rate of the cell-specific TA, a second-order change rate of the cell-specific TA, and a third-order change rate of the cell-specific TA.

[0164] At this time, the cell-specific TA = cell-specific TA reference value + (t-t0)*cell-specific TA first-order change rate + (t-t0)2*cell-specific TA second-order change rate. It can be understood that the cell-specific TA is the cell-specific TA at the first time t.

[0165] Optionally, the first information further includes a fifth TA, and the fifth TA is a TA indicated by a MAC CE. The terminal can determine a target TA according to the acquired cell-specific TA and the TA indicated by the MAC CE to compensate for the uplink timing advance.

[0166] For example: target TA = cell-specific TA + RAR / TAC indicated TA, or target TA = cell-specific TA - RAR / TAC indicated TA.

[0167] In the second implementation manner, if the first information includes a cell-specific TA reference value list and a cell-specific TA change rate, and the cell-specific TA reference value list includes cell-specific TA reference values of a plurality of reference locations at a first reference moment t0, the terminal acquires the TA according to the first information and / or the first moment t0, including: the terminal determines the cell-specific TA according to a cell-specific TA reference value of a second reference location in the TA reference value list at the first reference moment t0, the cell-specific TA change rate, and the first moment t0, wherein the second reference location is one of the plurality of reference locations.

[0168] For example, as shown in Table 1 above, the cell-specific TA reference value list includes cell-specific TA reference values of reference location 0 (e.g., reference location 0, RL 0), reference location 1 (RL 1), …, and reference location M (e.g., RL M-1) at the first reference moment t0. Wherein the number i in RLi (i = 0, 1, …, M-1) is a value determined according to the beam ID / SSB index, or a value configured by RRC. It can be understood that different reference locations can correspond to different beams, and the range of reference locations can be numbered by beam ID / SSB index.

[0169] At this time, the terminal can determine the cell-specific TA according to the cell-specific TA reference value of the second reference location RLi at the first reference moment t0 and the cell-specific TA change rate.

[0170] Wherein the second reference location RLi can satisfy at least one of the following:

[0171] 1) The reference location closest to the position of the terminal;

[0172] 2) One of the reference locations with a distance to the position of the terminal less than a first distance threshold, if there are multiple reference locations with a distance to the position of the terminal less than the first distance threshold, one can be randomly selected as the second reference location RLi, or one can be selected as the second reference location RLi according to priority.

[0173] Wherein the first distance threshold is a value defined by a protocol, configured by a network side device, or indicated by a network side device.

[0174] 3) The terminal determines according to the received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0175] Wherein, the cell-specific TA change rate can include at least one of the following: first order change rate of cell-specific TA, second order change rate of cell-specific TA and third order change rate of cell-specific TA.

[0176] Correspondingly, cell-specific TA = cell-specific TA reference value + (t-t0) * first order change rate of cell-specific TA + (t-t0)2* second order change rate of cell-specific TA.

[0177] Or, cell-specific TA = cell-specific TA reference value, and the TA change caused by satellite movement is compensated by MAC CE.

[0178] Optionally, the terminal can determine the target TA according to the obtained cell-specific TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA is the TA indicated by the MAC CE, and the terminal can determine the target TA according to the obtained cell-specific TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = cell-specific TA + RAR / TAC indicated TA, or target TA = cell-specific TA - RAR / TAC indicated TA. That is, TAC only needs to compensate for the time difference within each reference position range, and the value range of TAC can be smaller. When the reference position reaches a certain number, the difference of the target TA may fall within the CP range, in which case only cell-specific TA compensation is needed, and TAC is not needed.

[0179] In the third implementation manner, if the first information includes a cell-specific TA reference value list including cell-specific TA reference values of a plurality of reference locations at the first reference moment t0, the terminal acquires the TA according to the first information and / or the first moment t0, including: the terminal determines the cell-specific TA according to the cell-specific TA reference value of the second reference location at the first reference moment t0 in the TA reference value list and the first moment t0, where the second reference location is one of the plurality of reference locations.

[0180] For example, as shown in Table 1 above, the cell-specific TA reference value list includes cell-specific TA reference values of reference locations 0 (e.g., reference location 0, RL 0), reference location 1 (RL 1), …, reference location M (e.g., RL M-1) at the first reference moment t0. Wherein the number i in RLi (i = 0, 1, …, M-1) is a value determined according to the beam ID / SSB index, or a value configured by RRC. It can be understood that different reference locations can correspond to different beams, and the range of reference locations can be numbered by beam ID / SSB index.

[0181] At this time, the terminal can determine the cell-specific TA according to the reference value and the rate of change of the cell-specific TA at the first reference moment t0 and the second reference location RLi.

[0182] Wherein the second reference location RLi can satisfy at least one of the following:

[0183] 1) The reference location closest to the position of the terminal;

[0184] 2) One of the reference locations with a distance to the position of the terminal less than a first distance threshold, if there are multiple reference locations with a distance to the position of the terminal less than the first distance threshold, one can be randomly selected as the second reference location RLi, or one can be selected as the second reference location RLi according to the priority.

[0185] Wherein the first distance threshold is a value defined by a protocol, configured by a network side device or indicated by a network side device.

[0186] 3) The terminal determines according to the received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0187] Correspondingly, the cell-specific TA = cell-specific TA reference value, and the TA change caused by satellite movement is compensated by the MAC CE.

[0188] Optionally, the terminal can determine the target TA according to the acquired cell-specific TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA being the TA indicated by the MAC CE, and the terminal can determine the target TA according to the acquired cell-specific TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = cell-specific TA + TA indicated by RAR / TAC, or target TA = cell-specific TA - TA indicated by RAR / TAC. That is, the TAC only needs to compensate for the time difference within each reference position range, and the value range of the TAC can be smaller. When the number of reference positions reaches a certain number, the difference of the target TA can fall within the CP range, in which case the cell-specific TA can be compensated based only on the cell-specific TA, and the TAC is not required.

[0189] In the fourth implementation manner described above, if the first information includes a cell-specific TA reference value list, and the cell-specific TA reference value list includes a plurality of cell-specific TA reference values of the first reference position at a plurality of reference time instants, the terminal acquires the TA according to the first information and / or the first time instant t, including:

[0190] The terminal determines a second reference time instant according to the first time instant, wherein the second reference time instant is one of the plurality of reference time instants;

[0191] The terminal determines the cell-specific TA according to the cell-specific TA reference value of the first reference position at the second reference time instant in the TA reference value list.

[0192] For example, as shown in Table 2 above, the cell-specific TA reference value list includes the cell-specific TA reference values of the first reference position at reference time instants t0, t1,..., tN.

[0193] At this time, the terminal can determine the cell-specific TA according to the cell-specific TA reference value corresponding to the second reference time instant ti in the cell-specific TA reference value list.

[0194] The second reference time t i can satisfy at least one of the following:

[0195] 1) the time point in t 0, t 1, …, t N that is closest to the first time t;

[0196] 2) the time point in t 0, t 1, …, t N that is greater than the first time t and closest to the first time t;

[0197] 3) the time point in t 0, t 1, …, t N that is less than the first time t and closest to the first time t.

[0198] Correspondingly, the cell-specific TA = the reference value of the cell-specific TA at the first reference position and the second reference time t i, and the TA change caused by satellite movement is compensated by the MAC CE.

[0199] Optionally, the terminal can determine the target TA according to the acquired cell-specific TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA being the TA indicated by the MAC CE, and the terminal can determine the target TA according to the acquired cell-specific TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = cell-specific TA + TA indicated by RAR / TAC, or target TA = cell-specific TA - TA indicated by RAR / TAC. That is, TAC only needs to compensate for the time difference within the range of each reference position, and the value range of TAC can be smaller. When the number of reference positions reaches a certain number, the difference of the target TA can fall within the CP range, in which case only cell-specific TA compensation is needed, and TAC is not needed.

[0200] In the fifth implementation mode described above, if the first information includes a cell-specific TA reference value list, and the cell-specific TA reference value list includes cell-specific TA reference values of a plurality of reference positions (RL 0, RL 1, …, RL (M-1)) at a plurality of reference times (t 0, t 1, …, t N ), the terminal acquires the TA according to the first information and / or the first time t, including:

[0201] The terminal determines the second reference time t i according to the first time, wherein the second reference time t i is one of the plurality of reference times;

[0202] The terminal determines the cell-specific TA according to the cell-specific TA reference value of the second reference location RLi in the TA reference value list at the second reference moment ti.

[0203] For example, as shown in Table 3 above, the cell-specific TA reference value list includes a plurality of cell-specific TA reference values of a plurality of reference locations (RL0, RL1, …, RL(M-1)) at a plurality of reference moments (t0, t1, …, tN).

[0204] The second reference moment ti can be at least one of the following:

[0205] 1) the moment in t0, t1, …, tN that is closest to the first moment t;

[0206] 2) the moment in t0, t1, …, tN that is greater than the first moment t and is closest to the first moment t;

[0207] 3) the moment in t0, t1, …, tN that is less than the first moment t and is closest to the first moment t.

[0208] The second reference location RLi can be at least one of the following:

[0209] 1) the reference location closest to the location of the terminal;

[0210] 2) one of the reference locations whose distance from the location of the terminal is less than the first distance threshold, if there are multiple reference locations whose distance from the location of the terminal is less than the first distance threshold, one can be randomly selected as the second reference location RLi, or one can be selected as the second reference location RLi according to the priority.

[0211] The first distance threshold is a value defined by a protocol, configured by a network side device, or indicated by a network side device.

[0212] 3) determined by the terminal according to the received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0213] Correspondingly, the cell-specific TA = the reference value of the cell-specific TA at the first reference location and the second reference moment ti, and the TA change caused by satellite movement is compensated by the MAC CE.

[0214] Optionally, the terminal can determine the target TA according to the acquired cell-specific TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA being a TA indicated by the MAC CE, and the terminal can determine the target TA according to the acquired cell-specific TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = cell-specific TA + TA indicated by RAR / TAC, or target TA = cell-specific TA - TA indicated by RAR / TAC. That is, the TAC only needs to compensate for the time difference within each reference position range, and the value range of the TAC can be smaller. When the number of reference positions reaches a certain number, the difference of the target TA can fall within the CP range, in which case the compensation can be based only on the cell-specific TA, and the TAC is not required.

[0215] Scenario two: the TA includes a second TA and a third TA, and the second TA is a UE-specific common TA, and the third TA is a common TA

[0216] For example, as shown in FIG. 5, the second TA is the TA from the reference position 25 to the satellite 22, and the third TA is the common TA from the satellite 22 to the RP 23.

[0217] In the above first implementation, if the first information includes a UE-specific common TA reference value and a UE-specific common TA change rate, the terminal acquires the TA according to the first information and / or the first time t, including: the terminal determines the UE-specific common TA according to the UE-specific common TA reference value, the UE-specific common TA change rate and the first time.

[0218] The UE-specific common TA reference value is the UE-specific common TA of the first reference position at the first reference time t0.

[0219] The UE-specific common TA change rate includes at least one of the following: a first-order change rate of the UE-specific common TA, a second-order change rate of the UE-specific common TA, and a third-order change rate of the UE-specific common TA

[0220] At this time, the UE-specific common TA = UE-specific common TA reference value + (t-t0) * first order change rate of UE-specific common TA + (t-t0)2* second order change rate of UE-specific common TA. It can be understood that the UE-specific common TA is the UE-specific common TA at the first time t.

[0221] Optionally, the first information further includes a fifth TA, the fifth TA being a TA indicated by a MAC CE, and the terminal can determine a target TA according to the acquired UE-specific common TA and the TA indicated by the MAC CE to compensate for uplink timing advance.

[0222] For example, the target TA = UE-specific common TA + TA indicated by RAR / TAC, or the target TA = UE-specific common TA - TA indicated by RAR / TAC.

[0223] In the second implementation manner described above, if the first information includes a UE-specific common TA reference value list and a UE-specific common TA change rate, and the UE-specific common TA reference value list includes a plurality of UE-specific common TA reference values at a plurality of reference positions at the first reference time t0, the terminal acquires the TA according to the first information and / or the first time t, including: the terminal determines the UE-specific common TA according to the UE-specific common TA reference value at the second reference position in the TA reference value list at the first reference time and the change rate and the first time, wherein the second reference position is one of the plurality of reference positions.

[0224] For example, the UE-specific common TA reference value list includes reference positions 0 (e.g., reference location 0, RL

[0225] 0), reference location 1 (RL 1), …, reference location M (e.g., RL M-1) are respectively the UE-specific common TA reference values at the first reference time t0. Among them, the number i in RLi (i = 0, 1, …, M-1) is a value determined according to the beam ID / SSB index, or a value configured by RRC. It can be understood that different reference locations can correspond to different beams, and the range of reference locations can be numbered with beam ID / SSB index.

[0226] At this time, the terminal can determine the UE-specific common TA according to the reference value and the rate of change of the UE-specific common TA at the first reference time t0 and the second reference location RLi.

[0227] Among them, the second reference location RLi can satisfy at least one of the following:

[0228] 1) The reference location with the shortest distance from the location of the terminal;

[0229] 2) One of the reference locations with a distance from the location of the terminal less than a first distance threshold. If there are multiple reference locations with a distance from the location of the terminal less than the first distance threshold, one can be randomly selected as the second reference location RLi, or one can be selected as the second reference location RLi according to the priority.

[0230] Among them, the first distance threshold is a value defined by the protocol, configured by the network side device, or indicated by the network side device.

[0231] 3) The terminal determines according to the received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0232] Among them, the UE-specific common TA rate of change can include at least one of the following: the first-order change rate of UE-specific common TA, the second-order change rate of UE-specific common TA, and the third-order change rate of UE-specific common TA.

[0233] Correspondingly, UE-specific common TA = UE-specific common TA reference value + (t-t0)*UE-specific common TA first-order change rate + (t-t0)2*UE-specific common TA second-order change rate.

[0234] Or, UE-specific common TA = UE-specific common TA reference value, TA change caused by satellite movement is compensated by MAC CE.

[0235] Optionally, the terminal can determine the target TA according to the acquired UE-specific common TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA being the TA indicated by the MAC CE, and the terminal can determine the target TA according to the acquired UE-specific common TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = UE-specific common TA + TA indicated by RAR / TAC, or target TA = UE-specific common TA - TA indicated by RAR / TAC. That is, TAC only needs to compensate for the time difference within each reference position range, and the value range of TAC can be smaller. When the reference position reaches a certain number, the difference of the target TA may fall within the CP range, in which case only UE-specific common TA compensation is needed, and TAC is not needed.

[0236] In the third implementation manner described above, if the first information includes a UE-specific common TA reference value list, the UE-specific common TA reference value list including UE-specific common TA reference values of a plurality of reference positions at a first reference time t0, the terminal acquires the TA according to the first information and / or the first time t0, including: the terminal determines the UE-specific common TA according to the UE-specific common TA reference value of the second reference position in the TA reference value list at the first reference time and the first time, wherein the second reference position is one of the plurality of reference positions.

[0237] For example, the UE-specific common TA reference value list includes reference positions 0 (e.g., reference location 0, RL

[0238] 0), reference location 1 (RL 1), …, reference location M (e.g., RL M-1) are UE-specific common TA reference values at the first reference moment t0, respectively. Wherein, the number i in RLi (i = 0, 1, …, M-1) is a value determined according to the beam ID / SSB index, or a value configured by RRC. It can be understood that different reference locations can correspond to different beams, and the range of reference locations can be numbered with beam ID / SSB index.

[0239] At this time, the terminal can determine the UE-specific common TA according to the UE-specific common TA reference value and the rate of change of the terminal at the first reference moment t0 according to the second reference location RLi.

[0240] Wherein, the second reference location RLi can satisfy at least one of the following:

[0241] 1) The reference location with the shortest distance from the position of the terminal;

[0242] 2) One of the reference locations with a distance from the position of the terminal less than a first distance threshold, if there are multiple reference locations with a distance from the position of the terminal less than the first distance threshold, one can be randomly selected as the second reference location RLi, or one can be selected as the second reference location RLi according to the priority.

[0243] Wherein, the first distance threshold is a value defined by the protocol, configured by the network side device, or indicated by the network side device.

[0244] 3) The terminal determines according to the received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0245] Correspondingly, the UE-specific common TA = UE-specific common TA reference value, and the TA change caused by satellite movement is compensated by MAC CE.

[0246] Optionally, the terminal can determine the target TA according to the acquired UE-specific common TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA being a TA indicated by the MAC CE, and the terminal can determine the target TA according to the acquired UE-specific common TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = UE-specific common TA + RAR / TAC indicated TA, or target TA = UE-specific common TA - RAR / TAC indicated TA. That is, the TAC only needs to compensate for the time difference within each reference location range, and the value range of the TAC can be smaller. When the number of reference locations reaches a certain number, the difference of the target TA can fall within the CP range, in which case the UE-specific common TA can be compensated based on the UE-specific common TA only, without the TAC.

[0247] In the fourth implementation manner described above, if the first information includes a UE-specific common TA reference value list including UE-specific common TA reference values of the first reference location at a plurality of reference time instants, the terminal acquires the TA according to the first information and / or the first time instant t, including:

[0248] The terminal determines a second reference time instant according to the first time instant, wherein the second reference time instant is one of the plurality of reference time instants;

[0249] The terminal determines the UE-specific common TA according to the UE-specific common TA reference value of the first reference location at the second reference time instant in the TA reference value list.

[0250] For example, the UE-specific common TA reference value list includes UE-specific common TA reference values of the first reference location at reference time instants t0 (e.g., reference location 0, RL 0), t1 (RL 1), …, tN, respectively.

[0251] At this time, the terminal can determine the UE-specific common TA according to the UE-specific common TA reference value of the first reference location at the second reference time instant ti.

[0252] The second reference time t i can satisfy at least one of the following:

[0253] 1) The time in t 0, t 1, …, t N that is closest to the first time t;

[0254] 2) The time in t 0, t 1, …, t N that is greater than the first time t and closest to the first time t;

[0255] 3) The time in t 0, t 1, …, t N that is less than the first time t and closest to the first time t.

[0256] The second reference position R L i can satisfy at least one of the following:

[0257] 1) The reference position closest to the position of the terminal;

[0258] 2) One of the reference positions whose distance from the position of the terminal is less than the first distance threshold. If there are multiple reference positions whose distance from the position of the terminal is less than the first distance threshold, one can be randomly selected as the second reference position R L i, or one can be selected as the second reference position R L i according to a priority.

[0259] The first distance threshold is a value defined by a protocol, configured by a network side device, or indicated by a network side device.

[0260] 3) Determined by the terminal according to the received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0261] Correspondingly, the UE-specific common TA = the reference value of the UE-specific common TA at the first reference position and the second reference time t i, and the TA change caused by satellite movement is compensated by the MAC CE.

[0262] Optionally, the terminal can determine the target TA according to the acquired UE-specific common TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, the fifth TA being a TA indicated by the MAC CE, and the terminal can determine the target TA according to the acquired UE-specific common TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = UE-specific common TA + RAR / TAC indicated TA, or target TA = UE-specific common TA - RAR / TAC indicated TA. That is, the TAC only needs to compensate for the time difference within each reference location range, and the value range of the TAC can be smaller. When the number of reference locations reaches a certain number, the difference of the target TA can fall within the CP range, in which case the UE-specific common TA can be compensated based on the UE-specific common TA only, without the TAC.

[0263] In the fifth implementation manner, if the first information includes a UE-specific common TA reference value list, and the UE-specific common TA reference value list includes UE-specific common TA reference values of a plurality of reference locations (RL0, RL1, …, RL(M-1)) at a plurality of reference time instants (t0, t1, …, tN), the terminal acquires the TA according to the first information and / or the first time instant t, including:

[0264] The terminal determines a second reference time instant ti according to the first time instant, where the second reference time instant ti is one of the plurality of reference time instants;

[0265] The terminal determines the UE-specific common TA according to the UE-specific common TA reference value of the second reference location RLi at the second reference time instant ti in the TA reference value list.

[0266] For example, the UE-specific common TA reference value list includes a plurality of reference locations (RL0, RL1, …, RL(M-1)) respectively at a plurality of reference time instants (t0, t1, …, tN).

[0267] The second reference time instant ti can satisfy at least one of the following conditions:

[0268] 1) the time instant with the smallest interval from the first time instant t among t0, t1, …, tN;

[0269] 2) the smallest time point greater than the first time point and spaced apart from the first time point among t0, t1, …, tN;

[0270] 3) the smallest time point smaller than the first time point and spaced apart from the first time point among t0, t1, …, tN.

[0271] The second reference location RLi can satisfy at least one of the following:

[0272] 1) the reference location closest to the location of the terminal;

[0273] 2) one of the reference locations closest to the location of the terminal, if there are multiple reference locations closest to the location of the terminal, one can be randomly selected as the second reference location RLi, or one can be selected as the second reference location RLi according to a priority.

[0274] The first distance threshold is a value defined by a protocol, configured by a network side device, or indicated by a network side device.

[0275] 3) determined by the terminal according to a received beam ID or SSB index or CSI-RS index, for example, i = beam ID / SSB index / CSI-RS index.

[0276] Correspondingly, the UE-specific common TA = the reference value of the UE-specific common TA at the first reference location and the second time point ti, and the TA change caused by satellite movement is compensated by the MAC CE.

[0277] Optionally, the terminal can determine a target TA according to the obtained UE-specific common TA to compensate for uplink timing advance; or the first information further includes a fifth TA, the fifth TA being a TA indicated by the MAC CE, and the terminal can determine a target TA according to the obtained UE-specific common TA and the TA indicated by the MAC CE to compensate for uplink timing advance, for example: target TA = UE-specific common TA + TA indicated by RAR / TAC, or target TA = UE-specific common TA - TA indicated by RAR / TAC. That is, TAC only needs to compensate for the time difference within the range of each reference location, and the value range of TAC can be smaller. When the number of reference locations reaches a certain number, the difference of the target TA can fall within the CP range, in which case only UE-specific common TA compensation can be based on, and TAC is not required.

[0278] Further, for common TA:

[0279] 1) If the first information comprises a common TA reference value and a common TA change rate, the terminal acquires the TA according to the first information and / or the first time t, further comprising: the terminal determines the common TA according to the common TA reference value, the common TA change rate and the first time.

[0280] The common TA reference value is the common TA of the first reference position at the first reference time t0.

[0281] The common TA change rate comprises at least one of the following: a first-order change rate of the common TA, a second-order change rate of the common TA and a third-order change rate of the common TA.

[0282] At this time, the common TA = common TA reference value + (t-t0)*common TA first-order change rate + (t-t0)2*common TA second-order change rate. It can be understood that xommon TA is the common TA at the first time t.

[0283] 2) If the first information comprises a common TA reference value, the terminal acquires the TA according to the first information and / or the first time t, further comprising: the terminal determines the common TA according to the common TA reference value and the first time.

[0284] The common TA reference value is the common TA of the first reference position at the first reference time t0.

[0285] 3) If the first information comprises that the common TA is a preset value, the terminal acquires the TA according to the first information and / or the first time t, further comprising: the terminal determines the common TA according to the preset value.

[0286] 4) If the first information comprises a common TA reference value list, the common TA reference value list comprises common TA reference values of multiple reference times (t0, t1, …, tN), the terminal acquires the TA according to the first information and / or the first time t, further comprising:

[0287] The terminal determines a second reference time according to the first time, wherein the second reference time is one of the multiple reference times;

[0288] The terminal determines the common TA according to a common TA reference value of the second reference moment in the TA reference value list.

[0289] The second reference moment t i can satisfy at least one of the following conditions:

[0290] 1) the moment in t 0, t 1, …, t N that is closest to the first moment t;

[0291] 2) the moment in t 0, t 1, …, t N that is greater than the first moment t and is closest to the first moment t;

[0292] 3) the moment in t 0, t 1, …, t N that is less than the first moment t and is closest to the first moment t.

[0293] For example, common TA = the reference value of common TA at the second reference moment t i.

[0294] Further, the terminal determines a target TA according to the UE-specific common TA and the common TA to compensate for the uplink timing advance; or the first information further includes a fifth TA, which is a TA indicated by a MAC CE, and the terminal can determine a target TA according to the acquired UE-specific common TA, common TA and the TA indicated by the MAC CE to compensate for the uplink timing advance, for example: target TA = UE-specific common TA + common TA + TA indicated by RAR / TAC, or target TA = UE-specific common TA + common TA - TA indicated by RAR / TAC.

[0295] The compensation entities of the UE-specific common TA and the common TA can be the same, for example, the compensation entities of the UE-specific common TA and the common TA can both be the terminal or a network side device.

[0296] It can be understood that when the common TA is a preset value (for example, common TA = 0), the network side device can compensate for the common TA, or the TA indicated in the TAC / RAR includes the common TA part.

[0297] In some other embodiments, if the serving cell of the terminal is a mobile cell, the first information satisfies at least one of the following conditions:

[0298] The TA reference value;

[0299] a TA reference value at a first reference time;

[0300] a first time;

[0301] a satellite downtilt angle;

[0302] a TA change rate.

[0303] wherein the first time is at least one of: a time of sending of the uplink transmission, a time configured by the network-side device, a time in serving cell information configured by the network-side device, a time in neighbor cell information configured by the network-side device, a time at which the terminal receives the first information, a GNSS time at which the terminal receives the first information, and a downlink time at which the terminal receives the first information.

[0304] the first reference time comprises at least one of: a time configured by the network-side device, a time in serving cell information configured by the network-side device, a time in neighbor cell information configured by the network-side device, a time at which the terminal receives the first information, a GNSS time at which the terminal receives the first information, and a downlink time at which the terminal receives the first information.

[0305] In some embodiments, if the first information comprises a TA reference value at a first reference time and a first time, and the terminal acquires the TA according to the first information, comprising:

[0306] the terminal determines the TA reference value at the first time according to the TA reference value at the first reference time, the first time, and the satellite downtilt angle, and the terminal determines the TA according to the TA reference value at the first time.

[0307] wherein the TA reference value is a value of the TA at a first reference time, and the first reference time comprises at least one of: a time configured by the network-side device, a time in serving cell information configured by the network-side device, a time in neighbor cell information configured by the network-side device, a time at which the terminal receives the first information, a GNSS time at which the terminal receives the first information, and a downlink time at which the terminal receives the first information.

[0308] For example, in the above scenario, if the TA comprises a first TA, and the first TA is a cell-specific TA, then cell-specific TA = cell-specific TA reference value.

[0309] Further, the terminal determines the TA according to the TA reference value and the first time, comprising: the terminal determines the TA according to the TA reference value, the first time, and the satellite downtilt angle.

[0310] For example, in the above scenario, if the TA includes a first TA, and the first TA is a cell-specific TA, the terminal determines the cell-specific TA according to the cell-specific TA reference value, the first time, and the satellite downtilt angle. At this time, the cell-specific TA reference value is the reference value considered by the UE, not the reference TA of the cell defined by the network. In a moving cell, the cell-specific TA is fixed from the perspective of the network. Specifically:

[0311] 1) Calculate the cell-specific TA according to the speed of light and trigonometric functions.

[0312] Given the satellite downtilt angle, one side is the distance moved by the reference location in the (t-t0) time period; one side is the cell-specific TA reference value at the t0 time.

[0313] 2) cell-specific TA = cell-specific TA reference value + (t-t0). For this case, if the TA overcompensates, it can be corrected by the TA C.

[0314] 3) The cell-specific TA / UE-specific common TA / common TA change rate includes the change of the cell-specific TA / UE-specific common TA / common TA caused by the movement of the moving reference location, which is implemented by the network side device.

[0315] Alternatively, the first information further includes the TA change rate, wherein the terminal determines the TA according to the TA reference value and the first time, including:

[0316] The terminal determines the TA according to the TA reference value, the TA change rate, the first time, and the satellite downtilt angle.

[0317] Optionally, the first information further includes a fifth TA, and the fifth TA is a TA indicated by a MAC CE, and the method further includes: compensating the acquired TA (cell-specific TA / UE-specific common TA / common TA) according to the TA indicated by the MAC CE.

[0318] In some embodiments, the first information comprises a fifth TA, the fifth TA being a TA indicated by a MAC CE, and the obtaining the TA according to the first information comprises: obtaining the TA according to the TA indicated by the MAC CE. That is, the compensated TA is obtained according to the TA indicated by the MAC CE only, without pre-compensation of the cell-specific TA / UE-specific common TA / TA common, and the TA indicated by the MAC CE needs to be extended.

[0319] Optionally, the method shown in FIG. 3 can further comprise at least one of the following:

[0320] Initialization of the first information, for example, initialization of at least one of the TA reference value and the TA change rate;

[0321] Initialization of the TA.

[0322] In some embodiments, the initialization of the TA and / or the first information comprises:

[0323] The TA and / or the first information can be initialized according to a first reference time and a second time interval, wherein the first reference time comprises at least one of the following: a time configured by a network-side device, a time in service cell information configured by the network-side device, a time in neighbor cell information configured by the network-side device, a time when the terminal receives the first information, a GNSS time when the terminal receives the first information, and a downlink time when the terminal receives the first information, and the second time interval represents a time for a satellite to serve one cell and / or a time for a beam to last.

[0324] In some other embodiments, the initialization of the TA and / or the first information comprises:

[0325] The initialization of the TA and / or the first information can be according to a first reference time and a fourth list, wherein the first reference time comprises at least one of the following: a time configured by a network-side device, a time in service cell information configured by the network-side device, a time in neighbor cell information configured by the network-side device, a time when the terminal receives the first information, a GNSS time when the terminal receives the first information, and a downlink time when the terminal receives the first information, and the fourth list contains a correspondence between different cells and a second time interval, and the second time interval represents a time for a satellite to serve one cell and / or a time for a beam to last.

[0326] The determination of the second time interval comprises at least one of the following:

[0327] Protocol definition;

[0328] The network side device configures;

[0329] The network side device indicates;

[0330] A value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identifier, an orbit identifier, and a distance between satellites on an orbit.

[0331] In some embodiments, the initialization of the TA and / or the first information includes: triggering the initialization of the TA and / or the first information in a case where a first condition is met, wherein the first condition includes at least one of the following:

[0332] Synchronization signal block (SSB) switching, that is, SSB switching triggers the update of the common TA;

[0333] Service cell switching;

[0334] Service satellite switching;

[0335] Network switching;

[0336] Access network type change;

[0337] The network configures the initialization of the TA and / or the first information;

[0338] The network indicates the initialization of the TA and / or the first information;

[0339] Radio link failure;

[0340] Radio link recovery;

[0341] Radio link monitoring;

[0342] Radio link beam failure;

[0343] Radio link beam recovery.

[0344] Optionally, the above introduces a plurality of ways of acquiring the TA according to the first information, wherein the specific way of acquiring the TA according to the first information by the terminal can be determined according to at least one of the following:

[0345] Network side device configuration or indication;

[0346] According to the network type, wherein the network type can include an NTN network or a TN network;

[0347] According to the frequency spectrum information, wherein the frequency spectrum information can include at least one of the following: a licensed frequency band, an unlicensed frequency band, a TN frequency band, an NTN frequency band, a frequency range 1 (FR1), a frequency range 2 (FR2), and FR2-NTN.

[0348] determining according to the auxiliary information of the terminal, wherein the auxiliary information comprises information reported by the terminal device to the network side device;

[0349] determining according to the type of the terminal.

[0350] Optionally, various parameters (such as the first time, the reference time, the reference position, the latitude and longitude interval, the distance interval, the first time interval, the second time interval, and the first distance threshold, etc.) involved in the embodiments of the present application can be determined by at least one of the following ways:

[0351] 1) Protocol definition

[0352] 2) RRC configuration, such as MIB, SIB x (for example, SIB 1 and / or SIB 19), cell-specific (Cell specific) signaling, terminal-specific (UE specific) signaling, and the like.

[0353] 3) MAC CE indication

[0354] 4) PDCCH indication / two-stage DCI indication, such as group common (Group common) PDCCH indication, 1st stage DCI / two-stage (2nd stage) DCI indication, and the like.

[0355] The determination method of timing advance proposed in the embodiments of the present application can obtain TA according to the first information, since the first information comprises the value of the TA and / or information for determining the value of the TA, the first information does not contain ephemeris information, so that the dependence on ephemeris information can be eliminated when determining the TA, thereby avoiding frequent acquisition of ephemeris information, and further reducing terminal power consumption and improving spectrum efficiency.

[0356] As shown in FIG. 6, the embodiments of the present application also propose a communication method, which can comprise:

[0357] Step 601, the network side device sends first information to the terminal, wherein the first information comprises the value of the TA and / or information for determining the value of the TA.

[0358] The first information is used for the terminal to determine the TA. Specifically, the first information is used for the terminal to determine the TA of the first time t.

[0359] The TA can comprise at least one of the following:

[0360] Timing advance between downlink and uplink (TA between downlink and uplink)

[0361] The TA is a TA between uplink and Global Navigation Satellite System (GNSS). Alternatively, the TA can be a TA between a first time t determined by uplink and Global Navigation Satellite System (GNSS). Optionally, t is absolute time, or t is downlink time acquired according to GNSS, or t is uplink time acquired according to GNSS.

[0362] More specifically, the TA can be one of the following cases:

[0363] 1) a compensation TA of uplink (UL) compared to downlink (DL), wherein TA = round trip time (RTT);

[0364] 2) a compensation 2*TA of uplink compared to downlink, wherein TA = propagation delay (PD), or TA = RTT / 2;

[0365] 3) a compensation TA of uplink compared to downlink, wherein TA = PD, or TA = RTT / 2;

[0366] 4) a compensation TA of uplink compared to GNSS, wherein TA = PD, or TA = RTT / 2.

[0367] In some embodiments, the TA can include at least one of the following:

[0368] a first TA, which is one of a cell-specific TA, a beam specific TA, a beam common TA, a region specific TA, and a region common TA; or the first TA is a TA from a reference location to a network side device;

[0369] a second TA, which is a UE-specific common TA, or the second TA is a TA from a reference location to a satellite;

[0370] a third TA, which is a Common TA, or the third TA is a TA from a satellite to a network side device;

[0371] a fourth TA, which is a terminal specific TA (UE specific TA), or which is a TA from the terminal to a satellite;

[0372] a fifth TA, which is a TA indicated by a MAC CE, or which includes a TA indicated by a timing advance command (TAC) and / or a TA indicated by a random access response (RAR).

[0373] The network side device includes a reference point (RP) or a base station.

[0374] In some detailed embodiments, the first TA is a TA from a reference location to a network side device, specifically, the first TA can be one of the following:

[0375] a TA from the reference location to a satellite to an RP, wherein the RP can also be a base station;

[0376] a TA from the reference location to a satellite to an RP to a base station;

[0377] a TA from the reference location to a satellite;

[0378] a TA from the reference location to an RP, wherein the RP can also be a base station.

[0379] The RP can be on a satellite, or the RP can be on a base station, or the RP is between a terminal and a satellite, or the RP is between a satellite and a base station.

[0380] In some embodiments, the first information can include at least one of the following:

[0381] 1) a TA reference value;

[0382] 2) a TA reference value corresponding to a reference time, wherein the TA reference value includes one value or multiple values, and the reference time includes one time or multiple times;

[0383] 3) a TA reference value corresponding to a reference location, wherein the TA reference value includes one value or multiple values, and the reference location includes one location or multiple locations;

[0384] 4) a TA reference value corresponding to a reference time and a reference location, wherein the TA reference value includes one value or multiple values, the reference time includes one time or multiple times, and the reference location includes one location or multiple locations;

[0385] 5) TA variation rate, the TA variation rate including at least one of a first order variation rate, a second order variation rate and a third order variation rate.

[0386] Optionally, the method shown in FIG. 6 can further include: the network side device configuring / indicating other parameters to the terminal, wherein the other parameters can include at least one of the following:

[0387] a first time instant t;

[0388] a first distance threshold for determining the second reference position;

[0389] a position of the terminal;

[0390] a longitudinal and latitudinal interval or a distance interval of a fourth reference position in the plurality of reference positions relative to the third reference position;

[0391] a first time interval for determining the second reference time instant, etc.

[0392] For the physical meaning of the above parameters, please refer to the description of the determination method of timing advance proposed in the embodiments of the present application, which will not be repeated here.

[0393] The communication method proposed in the embodiments of the present application can send first information to the terminal, since the first information includes the value of the TA and / or information for determining the value of the TA, the first information does not contain ephemeris information, so that the dependence on ephemeris information can be eliminated when the terminal determines the TA, thereby avoiding frequent acquisition of ephemeris information, and further reducing the power consumption of the terminal and improving the spectrum efficiency.

[0394] The determination method of timing advance proposed in the embodiments of the present application will be illustrated by several specific embodiments.

[0395] Embodiment one: the terminal determines the target TA according to the UE-specific common TA and the common TA reference value and variation rate

[0396] Step 1, the network side device configures / indicates UE-specific common TA reference value and UE-specific common TA rate of change, wherein the UE-specific common TA rate of change includes first order rate of change of UE-specific common TA and / or second order rate of change of UE-specific common TA; and / or, the network side device configures / indicates common TA reference value and common TA rate of change, wherein the common TA rate of change includes first order rate of change of common TA and / or second order rate of change of common TA; and, the network side device configures / indicates first reference time t0 (t0 is UTC time, or is indicated as epoch time).

[0397] Step 2, the terminal acquires the first time t according to at least one of GNSS, SSB and time of receiving network configuration information.

[0398] Step 3, the terminal / network side device determines UE-specific common TA, that is, target UE-specific common TA, according to UE-specific common TA reference value, UE-specific common TA rate of change and the first time t.

[0399] For example, UE-specific common TA = UE-specific common TA reference value + (t-t0)*first order rate of change of UE-specific common TA + (t-t0)2*second order rate of change of UE-specific common TA

[0400] Step 4, the terminal / network side device determines common TA according to common TA reference value, common TA rate of change and the first time t.

[0401] For example, common TA = common TA reference value + (t-t0)*first order rate of change of common TA + (t-t0)2*second order rate of change of common TA.

[0402] Optionally, step 5, UE compensates target UE-specific common TA + common TA; or, UE compensates UE-specific common TA, network compensates common TA; or, network compensates UE-specific common TA + common TA; or, network compensates UE specific common, UE compensates common TA (this case is applicable to initial access, there is no TAC, the terminal can perform UL transmission based on common TA).

[0403] Optionally, step 6, the terminal / network side device determines the TA of the terminal based on the target UE-specific common TA and / or common TA, and the TA and / or offset TA parameter obtained by MAC CE signaling (RAR and / or TAC).

[0404] UE TA = UE-specific common TA + common TA + TA obtained by MAC CE signaling + offset TA

[0405] For example: UE TA = [UE-specific common TA reference value + (t-t0) * first-order change rate of UE-specific common TA + (t-t0)2* second-order change rate of UE-specific common TA] + [common TA reference value + (t-t0) * first-order change rate of common TA + (t-t0)2* second-order change rate of common TA] + (N TA +N TA,offset )T c , wherein Tc is a protocol-defined time unit.

[0406] For example: UE TA = [UE-specific common TA reference value + (t-t0) * first-order change rate of UE-specific common TA] + [common TA reference value + (t-t0) * first-order change rate of common TA] + (N TA +N TA,offset )T c

[0407] Or, UE TA = UE-specific common TA + TA obtained by MAC CE signaling + offset TA

[0408] The network side device compensates common TA through MAC CE signaling

[0409] Or, the TA acquired by MAC CE signaling includes common TA

[0410] For example: UE TA = [UE-specific common TA reference value + (t-t0)*UE-specific common TA first-order rate of change + (t-t0)2*UE-specific common TA second-order rate of change] + (N TA +N TA,offset )T c

[0411] Or, UE TA = common TA + TA acquired by MAC CE signaling (compared to a) and b), c) belongs to the determination method of low priority)

[0412] The network side device compensates UE-specific common TA through MAC CE signaling

[0413] Or, the TA acquired by MAC CE signaling includes UE-specific common TA

[0414] The advantage of the implementation manner described in step 6 in embodiment one is that the real-time reference time can be calculated, and then the residual TA compensated by different UEs is determined according to the indication of MAC CE. The design of MAC CE signaling (RAR / TAC) can be basically unchanged. The calculation of common TA can follow the content defined in NR, and the flexibility is higher.

[0415] Embodiment two: determine TA according to cell specific TA reference value and rate of change

[0416] Step 1, the network side device configures / indicates the cell specific TA reference value and the cell specific TA rate of change, wherein the cell specific TA rate of change includes the first-order rate of change of the cell specific TA and / or the second-order rate of change of the cell specific TA; the network side device configures / indicates the first reference time t0 (t0 can be UTC time, or epoch time indication).

[0417] Step 2, the terminal acquires the first time t according to at least one of GNSS, SSB and receiving network configuration information.

[0418] Step 3, the terminal / network side device determines the target cell specific TA according to the cell specific TA reference value, the cell specific TA change rate and the first time t.

[0419] cell specific TA = cell specific TA reference value + (t-t0)*first order change rate of cell specific TA + (t-t0)2*second order change rate of cell specific TA

[0420] Optionally, step 4, the terminal / network side device determines the UE TA based on the target cell specific TA, and the TA and / or offset TA parameters obtained by the MAC CE signaling (RAR and / or TAC).

[0421] UE TA = cell specific TA + TA obtained by the MAC CE signaling (RAR and / or TAC) + offset TA

[0422] For example: UE TA = [cell specific TA reference value + (t-t0)*first order change rate of cell specific TA + (t-t0)2*second order change rate of cell specific TA] + (N TA +N TA,offset )T c

[0423] Embodiment three: determining TA according to the cell specific TA reference value list and the change rate

[0424] There are two ways:

[0425] I. First, select the second reference position, and then calculate the target cell specific TA.

[0426] Step 1, the network side device configures a cell cell-specific TA reference value list and a cell-specific TA change rate, wherein the TA reference value list includes the reference values of the cell-specific TA at the reference position 0 (RL 0), the reference position 1 (RL 1), …, the reference position M (RL M-1); and the network side device configures the first reference time t0.

[0427] Wherein, the reference position can be represented by latitude and longitude coordinates and / or height.

[0428] As shown in Table 4, the values in the cell-specific TA reference value list (i.e., cell specific TA 0, cell specific TA 1, …, cell specific TA (M-1)) are respectively the cell-specific TA reference values of the reference location 0, the second reference location, …, the Mth reference location.

[0429] Table 4 Cell-specific TA reference value list

[0430] Step 2, the terminal acquires the first time t and the position of the terminal according to GNSS. Alternatively, the terminal acquires the first time t and the SSB index according to SSB, and then determines the second reference location RLi according to the SSB index. Alternatively, the terminal determines the first time t and the position of the terminal according to the configuration / instruction of the network side device. Alternatively, the position of the terminal is acquired according to positioning.

[0431] Optionally, step 3, the terminal determines the second reference location RLi according to the position of the terminal. Wherein, the second reference location RLi is the closest to the terminal, or the distance between the terminal and the second reference location RLi is less than the first distance threshold.

[0432] Step 4, the terminal determines the cell specific TA of the first time t, that is, the target cell specific TA, according to the reference value of the cell specific TA in the cell-specific TA reference value list at the second reference location RLi and the cell specific TA change rate.

[0433] For example, cell specific TA = cell specific TA n reference value + (t-t0)*cell specific TA first order change rate + (t-t0)2*cell specific TA second order change rate

[0434] Step 5, the terminal / network side device determines the TA of the terminal based on the target cell specific TA, and the TA and / or offset TA parameter acquired by the MAC CE signaling (RAR and / or TAC).

[0435] For example, UE TA = cell specific TA + TA acquired by MAC CE signaling (RAR and / or TAC) + offset TA

[0436] Specifically, UE TA = [cell specific TAnreference value + (t-t0) * cell specific TA first order rate of change + (t-t0)2* cell specific TA second order rate of change] + (N TA +N TA,offset )T c

[0437] II. Calculate cell specific TA list first, then select target cell specific TA.

[0438] Step 1, network side device configures cell-specific TA reference value list and cell-specific TA rate of change, wherein, the TA reference value list includes the reference values of cell-specific TA at reference location 0 (RL 0), reference location 1 (RL 1), …, reference location M (RL M-1); and the network side device configures the first reference time t0.

[0439] Wherein, the reference location can be represented by latitude and longitude coordinates and / or height.

[0440] As shown in Table 5, the values in the cell-specific TA reference value list (i.e., cell specific TA 0, cell specific TA 1, …, cell specific TA (M-1)) are respectively the cell-specific TA reference values at reference location 0, second reference location, …, Mth reference location.

[0441] Table 5 Cell-specific TA reference value list

[0442] Step 2, the terminal acquires the first time t and the position of the terminal according to GNSS. Or, the terminal acquires the first time t and the SSB index according to SSB, and then determines the second reference location RLi according to the SSB index. Or, the terminal determines the first time t and the position of the terminal according to the configuration / instruction of the network side device. Or, the position of the terminal is acquired according to positioning.

[0443] Step 3, the terminal determines the cell-specific TA list at the first time t according to the cell-specific TA reference value list and the rate of change.

[0444] For example, cell specific TA = cell specific TA X reference value + (t-t0) * first order change rate of cell specific TA + (t-t0)2* second order change rate of cell specific TA. Wherein, X = 0, 1, …, M-1.

[0445] Optionally, step 4, the terminal determines the second reference location RLi according to the location of the terminal. Wherein, the second reference location RLi is the closest to the terminal, or the distance between the terminal and the reference location is less than the first distance threshold.

[0446] Step 5, the terminal obtains the cell specific TAi according to RLi and cell-specific TAlist. The cell specific TAi is the target cell specific TA.

[0447] Step 6, the terminal / network side device determines the TA of the terminal based on the target cell specific TA, and the TA and / or offset TA parameter obtained by the MAC CE signaling (RAR and / or TAC).

[0448] For example, UE TA = cell specific TA + TA obtained by MAC CE signaling (RAR and / or TAC) + offset TA

[0449] Specifically, UE TA = [cell specific TAn reference value + (t-t0) * first order change rate of cell specific TA + (t-t0)2* second order change rate of cell specific TA] + (N TA +N TA,offset )T c

[0450] Embodiment four: in the moving cell scenario, the TA is determined.

[0451] Step 1, the network side device configures the UE specific common TA reference value; the network side device configures the first reference location (reference location 0, RL 0) and the moving vector of the first reference location; the network side device configures the first reference time t0, and the satellite downtilt angle.

[0452] Wherein, the first reference location is the reference location at the first reference time t0.

[0453] Optionally, in step 2, the network-side device configures / indicates the common TA reference value and the common TA rate of change, wherein the common TA rate of change includes the first-order change rate of the common TA and / or the second-order change rate of the common TA.

[0454] In step 3, the terminal acquires the first time t according to GNSS, or acquires the first time t according to SSB, or acquires the first time t according to the received network configuration information.

[0455] Optionally, in step 4, the terminal / network-side device determines the common TA according to the common TA reference value, the common TA rate of change, and the first time t.

[0456] Wherein, common TA = common TA reference value + (t-t0)*common TA first-order change rate + (t-t0)2*common TA second-order change rate.

[0457] Or, common TA = common TA reference value

[0458] Or, common TA = 0

[0459] In step 5, as shown in FIG. 7, the terminal can determine the reference location of the second reference time t1, i.e., the reference location 1, according to the first time t, the first reference time t0, the first reference location, and the moving vector of the first reference location. The terminal can determine the UE specific common TA between the reference location 0 and the satellite at the first time t according to the satellite downtilt angle, the UE specific common TA reference value, and the trigonometric function calculation rule, wherein the first time t is equal to the second reference time t1.

[0460] In step 6, the terminal determines the TA according to the acquired UE specific common TA and the common TA, and the MAC CE, to obtain the compensated TA. Or, the UE determines the TA (network-compensated common TA) according to the acquired UE specific common TA and the MAC CE.

[0461] Embodiment five: determining TA in a moving cell scenario.

[0462] In step 1, the network-side device configures a cell-specific TA reference value; the network-side device configures a first reference location (reference location 0, RL 0) and a moving vector of the first reference location; the network-side device configures a first reference time t0 and a satellite downtilt angle.

[0463] The first reference position is a reference position at a first reference time t0.

[0464] Optionally, in step 2, the network-side device configures / indicates a common TA reference value and a common TA change rate, wherein the common TA change rate includes a first-order change rate of the common TA and / or a second-order change rate of the common TA.

[0465] In step 3, the terminal acquires the first time t according to GNSS, or acquires the first time t according to SSB, or acquires the first time t according to receiving network configuration information.

[0466] Optionally, in step 4, the terminal / network-side device determines the common TA according to the common TA reference value, the common TA change rate, and the first time t.

[0467] The common TA = common TA reference value + (t-t0)*first-order change rate of common TA + (t-t0)2*second-order change rate of common TA.

[0468] Or, common TA = common TA reference value

[0469] Or, common TA = 0

[0470] In step 5, as shown in FIG. 7, the terminal can determine the reference position of the second reference time t1-reference position 1 according to the first time t, the first reference time t0, the first reference position, and the moving vector of the first reference position. The terminal can determine the cell-specific TA between the reference position 0 and the satellite at the first time t according to the satellite downtilt angle, the cell-specific TA reference value, and the trigonometric function calculation rule. The first time t is equal to the second reference time t1.

[0471] For example, an angle is the satellite downtilt angle; a side length is the distance between the reference position 1 and the reference position 0; and a side length is (cell-specific TA-common TA)*light speed.

[0472] In step 6, the terminal determines the TA after compensation according to the acquired cell-specific TA and the TA indicated by the MAC CE.

[0473] By the method for determining timing advance provided in the embodiments of the present application, the terminal does not need to receive / frequently receive ephemeris information to obtain the timing advance of the terminal, so as to reduce the power consumption of the terminal. The network measurement device can not need to send ephemeris information, or does not need to frequently send ephemeris information, so as to improve the spectrum efficiency in the system. Moreover, when the terminal cannot obtain time or position information according to GNSS, the TA can also be obtained by the method for determining timing advance provided in the embodiments of the present application, and the terminal can access through the NTN network.

[0474] The method for determining timing advance or the communication method provided in the embodiments of the present application can be executed by a virtual device. In the embodiments of the present application, the method for determining timing advance or the communication method executed by the virtual device is taken as an example to illustrate the method for determining timing advance and the communication device provided in the embodiments of the present application.

[0475] As shown in FIG. 8, an embodiment of the present application provides a device 800 for determining timing advance, which can be used in a terminal. The device 800 can include an information obtaining module 801, configured to obtain timing advance (TA) according to first information, wherein the first information includes a value of the TA and / or information used for determining the TA.

[0476] The TA can include at least one of the following:

[0477] Timing advance between uplink and downlink (Timing advance between downlink and uplink);

[0478] The TA is the TA between uplink and global navigation satellite system (GNSS). Alternatively, the TA can be the TA between uplink and a first time t determined by global navigation satellite system (GNSS). Optionally, t is absolute time, or t is downlink time obtained according to GNSS, or t is uplink time obtained according to GNSS.

[0479] More specifically, the TA can be one of the following cases:

[0480] 1) compensation TA of uplink (UL) compared to downlink (DL), wherein TA = round trip time (RTT);

[0481] 2) compensation of 2*TA for uplink compared to downlink, where TA=propagation delay (PD), or TA=RTT / 2;

[0482] 3) compensation of TA for uplink compared to downlink, where TA=PD, or TA=RTT / 2;

[0483] 4) compensation of TA for uplink compared to GNSS, where TA=PD, or TA=RTT / 2.

[0484] The first information can be acquired according to at least one of the following:

[0485] a protocol definition;

[0486] a network-side device configuration;

[0487] a network-side device indication.

[0488] In some embodiments, the TA can include at least one of the following:

[0489] a first TA, which is one of a cell-specific TA, a beam-specific TA, a beam common TA, a region-specific TA, and a region common TA; or the first TA is a TA from a reference location to a network-side device;

[0490] a second TA, which is a UE-specific common TA, or the second TA is a TA from a reference location to a satellite;

[0491] a third TA, which is a Common TA, or the third TA is a TA from a satellite to a network-side device;

[0492] a fourth TA, which is a UE specific TA, or the fourth TA is a TA from the terminal to a satellite;

[0493] a fifth TA, which is a TA indicated by a MAC CE, or the fifth TA includes a TA indicated by a timing advance command (TAC) and / or a TA indicated by a random access response (RAR).

[0494] The network-side device includes a reference point (RP) or a base station.

[0495] In some detailed embodiments, the first TA is a TA of a reference location to a network-side device. Specifically, the first TA can be one of the following:

[0496] a TA of the reference location to a satellite to an RP, wherein the RP can also be a base station;

[0497] a TA of the reference location to a satellite to an RP to a base station;

[0498] a TA of the reference location to a satellite;

[0499] a TA of the reference location to an RP, wherein the RP can also be a base station.

[0500] The RP can be on a satellite, or the RP can be on a base station, or the RP is between a terminal and a satellite, or the RP is between a satellite and a base station.

[0501] In some embodiments, the first information can include at least one of the following:

[0502] 1) a TA reference value;

[0503] 2) a TA reference value corresponding to a reference time, wherein the TA reference value includes one value or multiple values, and the reference time includes one time or multiple times;

[0504] 3) a TA reference value corresponding to a reference location, wherein the TA reference value includes one value or multiple values, and the reference location includes one location or multiple locations;

[0505] 4) a TA reference value corresponding to a reference time and a reference location, wherein the TA reference value includes one value or multiple values, the reference time includes one time or multiple times, and the reference location includes one location or multiple locations;

[0506] 5) a TA change rate, including at least one of a first-order change rate, a second-order change rate, and a third-order change rate.

[0507] Further, in some embodiments, the information acquisition module 801 can be configured to acquire the TA according to the first information and / or the first time.

[0508] In one case, the information acquisition module 801 can be configured to acquire the TA according to the first information.

[0509] In another case, the information obtaining module 801 can be configured to obtain the TA according to the first information and the first time point.

[0510] The first time point t can be determined according to at least one of the following:

[0511] 1) obtained by the terminal according to GNSS;

[0512] 2) determined by the terminal according to a synchronization signal block (SSB);

[0513] 3) determined by the terminal according to a channel state information-reference signal (CSI-RS);

[0514] 4) obtained by the terminal according to first configuration information, wherein the first configuration information includes at least one of the following: a system information block (SIB), a master information block (MIB), a radio resource control message (RRC), a multimedia access control control element (MAC CE), and a downlink control information (DCI). For example, the first time point t can be a broadcast time t and / or a difference value in a SIB-x (e.g., SIB 19), and accordingly, the terminal can determine the TA according to the broadcast time t and interpolation;

[0515] 5) obtained by a network side device, for example, a time t obtained by a base station / satellite;

[0516] 6) a sending time point of uplink transmission;

[0517] 7) obtained by the terminal according to a resource carrying uplink transmission, wherein the resource can be a time point of a first resource carrying uplink transmission, or a time point of an Nth resource in the resource carrying uplink transmission.

[0518] Further, in the first implementation, the first information includes the TA reference value and the TA change rate, wherein the information obtaining module 801 can be specifically configured to determine the TA according to the TA reference value, the TA change rate, and the first time point.

[0519] Optionally, the TA reference value is a TA reference value corresponding to a first reference time t0, or the TA reference value is a TA reference value of the first reference position at the first reference time t0.

[0520] In the second implementation, the first information includes a first list and a TA change rate, the first list includes a plurality of TA reference values of a plurality of reference positions at a first reference time, or the first list includes a plurality of TA reference values corresponding to a plurality of reference positions, wherein the information obtaining module 801 can be specifically configured to: determine the TA according to a TA reference value corresponding to a second reference position in the first list and the TA change rate, and the first time, wherein the second reference position is one of the plurality of reference positions.

[0521] In the third implementation, the first information includes a first list, the first list includes a plurality of TA reference values of a plurality of reference positions at a first reference time, or the first list includes a plurality of TA reference values corresponding to a plurality of reference positions, wherein the information obtaining module 801 can be specifically configured to: determine the TA according to a reference value corresponding to a second reference position in the first list, wherein the second reference position is one of the plurality of reference positions.

[0522] In the fourth implementation, the first information includes a second list, the second list includes a plurality of TA reference values of a first reference position at a plurality of reference times, wherein the information obtaining module 801 can be specifically configured to:

[0523] determine a second reference time according to the first time, wherein the second reference time is one of the plurality of reference times;

[0524] determine the TA according to a reference value of the TA at the first reference position and the second reference time in the second list.

[0525] Optionally, the second list includes a plurality of TA reference values at a plurality of reference times, wherein the information obtaining module 801 can be specifically configured to: determine the TA according to a TA reference value corresponding to a second reference time in the second list, wherein the second reference time is one of the plurality of reference times.

[0526] In the fifth implementation, the first information includes a third list, the third list includes a plurality of TA reference values of a plurality of reference positions at a plurality of reference times, wherein the information obtaining module 801 can be specifically configured to:

[0527] determine a second reference time according to the first time, wherein the second reference time is one of the plurality of reference times;

[0528] The TA is determined according to a TA reference value of a second reference position in the third list at a second reference time, wherein the second reference position is one of the plurality of reference positions.

[0529] In the above embodiments, the plurality of reference times can include at least one of the following: a time configured by the network-side device, a time in the serving cell information configured by the network-side device, a time in the neighbor cell information configured by the network-side device, a time when the terminal receives the first information, a GNSS time when the terminal receives the first information, and a downlink time when the terminal receives the first information.

[0530] In the above embodiments, the plurality of reference positions include at least one of the following: a position configured by the network-side device, a position in the serving cell configured by the network-side device, a position in the neighbor cell configured by the network-side device, a predefined cell center position, and a position determined according to a predefined rule.

[0531] Further, in the above fourth and fifth embodiments, the second reference time can satisfy at least one of the following:

[0532] a time in the plurality of reference times that is closest to the first time;

[0533] a time in the plurality of reference times that is greater than the first time and closest to the first time;

[0534] a time in the plurality of reference times that is less than the first time and closest to the first time.

[0535] Further, in the above second, third, and fifth embodiments, the second reference position can satisfy any one of the following:

[0536] a reference position in the plurality of reference positions that is closest to the terminal;

[0537] one of the reference positions in the plurality of reference positions that has a distance to the terminal less than or equal to a first distance threshold;

[0538] The first reference position is determined according to an index of second configuration information received by the terminal, wherein the index of the second configuration information includes at least one of the following: a beam ID, an SSB index, and a CSI-RS index.

[0539] The first distance threshold can be obtained by at least one of the following:

[0540] a protocol definition;

[0541] a network-side device configuration;

[0542] The network-side device indicates.

[0543] The position of the terminal can be obtained by at least one of the following:

[0544] The terminal obtains the position according to GNSS;

[0545] The terminal obtains the position according to positioning measurement, wherein the positioning measurement can be triggered by the network-side device or triggered by the terminal;

[0546] The network-side device obtains the position.

[0547] Further, in the above embodiments, the representation of the reference position can include any of the following (for example, RL0, RL1, …, RL(M-1) can be any of the following):

[0548] Latitude and longitude coordinates;

[0549] Latitude and longitude coordinates and height, which can be altitude;

[0550] A third reference position (for example, RL0) in the plurality of reference positions can be represented by latitude and longitude coordinates, and a fourth reference position (for example, RL1, …, RL(M-1)) in the plurality of reference positions can be represented by a value determined by the latitude and longitude interval or the distance interval of the fourth reference position relative to the third reference position.

[0551] The determination of the latitude and longitude interval or the distance interval includes at least one of the following:

[0552] Protocol definition;

[0553] Network-side device configuration;

[0554] Network-side device indication;

[0555] A value determined according to at least one of the following: satellite orbital height, satellite moving speed, satellite downtilt angle, satellite identifier, orbital identifier, and distance between satellites on the orbit.

[0556] Further, in the above embodiments, the representation of the reference time includes any of the following:

[0557] Coordinated Universal Time (UTC);

[0558] The earliest time (for example, t0) in the plurality of reference times (for example, t0, t1, …, tN) is UTC, and other times (for example, t1, …, tN) in the plurality of reference times are values determined by a first time interval of the time relative to the earliest time;

[0559] The plurality of reference time instants are time instants of a system frame number (SFN), wherein the time instants of the SFN are time instants that are advanced in time according to the SSB.

[0560] The first time interval is determined in at least one of the following ways:

[0561] A protocol definition;

[0562] A network-side device configuration;

[0563] A network-side device indication;

[0564] A value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identifier, an orbit identifier, and a distance between satellites on an orbit.

[0565] In some embodiments, the first information comprises the TA reference value, and the terminal determines the TA according to the TA reference value.

[0566] Optionally, the TA reference value is a TA reference value corresponding to a first reference time instant, or the TA reference value is a TA reference value of a first reference location at a first reference time instant.

[0567] In some embodiments, the first information indicates that the TA is a preset value, and the terminal determines the TA according to the preset value.

[0568] Optionally, in any of the above embodiments, the first information further comprises a fifth TA, and the apparatus 800 shown in FIG. 8 further comprises a TA compensation module configured to compensate the TA according to the fifth TA.

[0569] In the embodiments of the present application, the first reference time instant t0 comprises at least one of the following: a time instant configured by a network-side device, a time instant in service cell information configured by a network-side device, a time instant in neighbor cell information configured by a network-side device, a time instant at which the terminal receives the first information, a GNSS time instant at which the terminal receives the first information, and a downlink time instant at which the terminal receives the first information; and the first reference location comprises at least one of the following: a location configured by a network-side device, a location in a service cell configured by a network-side device, a location in a neighbor cell configured by a network-side device, a predefined cell center location, and a location determined according to a predefined rule.

[0570] In some embodiments, the first information comprises a fifth TA, the fifth TA being a TA indicated by a MAC CE, and the information obtaining module 801 can be configured to: obtain the TA according to the TA indicated by the MAC CE. That is, the compensated TA is obtained according to the TA indicated by the MAC CE only, without pre-compensation of the cell-specific TA / UE-specific common TA / TA common, and the TA indicated by the MAC CE needs to be extended.

[0571] In some other embodiments, if the serving cell of the terminal is a mobile cell, the first information comprises at least one of:

[0572] the TA reference value;

[0573] the TA reference value at the first reference moment;

[0574] the first moment;

[0575] the satellite downtilt angle;

[0576] the TA change rate.

[0577] The first moment is at least one of: a sending moment of uplink transmission, a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment when the terminal receives the first information, a GNSS moment when the terminal receives the first information, and a downlink moment when the terminal receives the first information.

[0578] The first reference moment comprises at least one of: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment when the terminal receives the first information, a GNSS moment when the terminal receives the first information, and a downlink moment when the terminal receives the first information.

[0579] In some embodiments, if the first information comprises the TA reference value at the first reference moment and the first moment, the information obtaining module 801 can be specifically configured to:

[0580] determine the TA reference value at the first moment according to the TA reference value at the first reference moment, the first moment, and the satellite downtilt angle, and the terminal determines the TA according to the TA reference value at the first moment.

[0581] The TA reference value is a value of the TA at a first reference moment, and the first reference moment includes at least one of the following: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment at which the terminal receives the first information, a GNSS moment at which the terminal receives the first information, and a downlink moment at which the terminal receives the first information.

[0582] Alternatively, the first information further includes the TA change rate, and the information obtaining module 801 is specifically configured to determine the TA according to the TA reference value, the TA change rate, a first moment, and a satellite downtilt angle.

[0583] Optionally, the apparatus shown in FIG. 8 can further include an initialization module configured to initialize the TA and / or the first information.

[0584] In some embodiments, the initialization module is specifically configured to initialize the TA according to a first reference moment and a second time interval, wherein the first reference moment includes at least one of the following: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment at which the terminal receives the first information, a GNSS moment at which the terminal receives the first information, and a downlink moment at which the terminal receives the first information, and the second time interval represents a time for which a satellite serves one cell and / or a time for which one beam lasts.

[0585] In some other embodiments, the initialization module is specifically configured to initialize the TA according to a first reference moment and a fourth list, wherein the first reference moment includes at least one of the following: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment at which the terminal receives the first information, a GNSS moment at which the terminal receives the first information, and a downlink moment at which the terminal receives the first information, and the fourth list contains a correspondence relationship between different cells and a second time interval, and the second time interval represents a time for which a satellite serves one cell and / or a time for which one beam lasts.

[0586] The determination manner of the second time interval includes at least one of the following:

[0587] A protocol definition;

[0588] The network-side device configuration;

[0589] A network-side device indication;

[0590] a value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identifier, an orbit identifier, and a distance between satellites on an orbit.

[0591] In some embodiments, the initialization module is specifically configured to trigger initialization of the TA and / or the first information in a case where a first condition is met, wherein the first condition includes at least one of the following:

[0592] Synchronization signal block (SSB) switching, that is, SSB switching triggers update of the COMMON TA;

[0593] Service cell switching;

[0594] Service satellite switching;

[0595] Network switching;

[0596] Access network type change;

[0597] The network configures initialization of the TA and / or the first information;

[0598] The network indicates initialization of the TA and / or the first information;

[0599] Radio link failure;

[0600] Radio link recovery;

[0601] Radio link monitoring;

[0602] Radio link beam failure;

[0603] Radio link beam recovery.

[0604] Optionally, the above introduces multiple ways in which the information acquisition module 801 acquires the TA according to the first information, wherein the specific way in which the information acquisition module 801 acquires the TA according to the first information can be determined according to at least one of the following:

[0605] Network side device configuration or indication;

[0606] According to the network type, wherein the network type can include an NTN network or a TN network;

[0607] According to the frequency spectrum information, wherein the frequency spectrum information can include at least one of the following: a licensed frequency band, an unlicensed frequency band, a TN frequency band, an NTN frequency band, a frequency range 1 (FR1), a frequency range 2 (FR2), and FR2-NTN;

[0608] According to the auxiliary information of the terminal, wherein the auxiliary information includes information reported by the terminal device to the network side device;

[0609] determined according to the type of the terminal.

[0610] Optionally, various parameters (such as the first time, the reference time, the reference position, the latitude and longitude interval, the distance interval, the first time interval, the second time interval, and the first distance threshold, etc.) involved in the embodiments of the present application can be determined by at least one of the following manners:

[0611] 1) Protocol definition

[0612] 2) RRC configuration, such as MIB, SIB x (for example, SIB 1 and / or SIB 19), cell specific (Cell specific) signaling, UE specific (UE specific) signaling, and the like.

[0613] 3) MAC CE indication

[0614] 4) PDCCH indication / two-stage DCI indication, such as Group common PDCCH indication, 1st stage DCI / two-stage (2nd stage) DCI indication, and the like.

[0615] The determination device for timing advance provided in the embodiments of the present application can obtain the TA according to the first information. Since the first information includes the value of the TA and / or information for determining the value of the TA, the first information does not contain ephemeris information, so that the dependence on ephemeris information can be eliminated when determining the TA, thereby avoiding frequent acquisition of ephemeris information, and further reducing terminal power consumption and improving spectrum efficiency.

[0616] As shown in FIG. 9, the embodiments of the present application further provide a communication device 900, which can be applied to a network side device. The communication device 900 can include an information sending module 901 configured to send first information to a terminal, wherein the first information includes the value of the TA and / or information for determining the value of the TA.

[0617] The first information is used by the terminal to determine the TA. Specifically, the first information is used by the terminal to determine the TA at the first time t.

[0618] The TA can include at least one of the following:

[0619] Timing advance between downlink and uplink (TA between downlink and uplink);

[0620] The TA is a TA between uplink and Global Navigation Satellite System (GNSS). Alternatively, the TA can be a TA between uplink and a first time t determined by Global Navigation Satellite System (GNSS). Optionally, t is an absolute time, or t is a downlink time acquired according to GNSS, or t is an uplink time acquired according to GNSS.

[0621] More specifically, the TA can be one of the following cases:

[0622] 1) a compensated TA of uplink (UL) compared to downlink (DL), where TA = round trip time (RTT);

[0623] 2) a compensated 2*TA of uplink compared to downlink, where TA = propagation delay (PD), or TA = RTT / 2;

[0624] 3) a compensated TA of uplink compared to downlink, where TA = PD, or TA = RTT / 2;

[0625] 4) a compensated TA of uplink compared to GNSS, where TA = PD, or TA = RTT / 2.

[0626] In some embodiments, the TA can include at least one of the following:

[0627] a first TA, which is one of a cell-specific TA, a beam specific TA, a beam common TA, a region specific TA, and a region common TA; or which is a TA from a reference location to a network side device;

[0628] a second TA, which is a UE-specific common TA, or which is a TA from a reference location to a satellite;

[0629] a third TA, which is a Common TA, or which is a TA from a satellite to a network side device;

[0630] a fourth TA, which is a terminal-specific TA (UE specific TA) or a terminal-to-satellite TA;

[0631] a fifth TA, which is a TA indicated by a MAC CE, or which includes a TA indicated by a timing advance command (TAC) and / or a TA indicated by a random access response (RAR).

[0632] The network-side device includes a reference point (RP) or a base station.

[0633] In some detailed embodiments, the first TA is a reference location-to-network-side device TA, specifically, the first TA can be one of the following:

[0634] a reference location-to-satellite-to-RP TA, wherein the RP can also be a base station;

[0635] a reference location-to-satellite-to-RP-to-base station TA;

[0636] a reference location-to-satellite TA;

[0637] a reference location-to-RP TA, wherein the RP can also be a base station.

[0638] The RP can be on a satellite, or the RP can be on a base station, or the RP is between a terminal and a satellite, or the RP is between a satellite and a base station.

[0639] In some embodiments, the first information can include at least one of the following:

[0640] 1) a TA reference value;

[0641] 2) a TA reference value corresponding to a reference time, wherein the TA reference value includes one value or multiple values, and the reference time includes one time or multiple times;

[0642] 3) a TA reference value corresponding to a reference location, wherein the TA reference value includes one value or multiple values, and the reference location includes one location or multiple locations;

[0643] 4) a TA reference value corresponding to a reference time and a reference location, wherein the TA reference value includes one value or multiple values, the reference time includes one time or multiple times, and the reference location includes one location or multiple locations;

[0644] 5) TA rate of change, including at least one of first order, second order, and third order rate of change.

[0645] Optionally, the communication apparatus 900 shown in FIG. 9 can further include a parameter configuration module, configured to configure / indicate other parameters to the terminal, wherein the other parameters can include at least one of the following:

[0646] a first time t;

[0647] a first distance threshold for determining the second reference position;

[0648] a position of the terminal;

[0649] a longitudinal and latitudinal interval or distance interval of a fourth reference position in the plurality of reference positions relative to the third reference position;

[0650] a first time interval for determining the second reference time, etc.

[0651] For the physical meaning of the above parameters, please refer to the description of the method for determining timing advance proposed in the embodiments of the present application, which will not be repeated here.

[0652] The communication apparatus 900 proposed in the embodiments of the present application can send the first information to the terminal, since the first information includes the value of the TA and / or the information for determining the value of the TA, the first information does not contain ephemeris information, thus, the dependence on ephemeris information can be eliminated when the terminal determines the TA, so that the frequent acquisition of ephemeris information can be avoided, and the terminal power consumption can be reduced, and the spectrum efficiency can be improved.

[0653] The determination apparatus 800 for timing advance provided in the embodiments of the present application can implement each process implemented by the method embodiment of FIG. 3, and achieve the same technical effects, to avoid repetition, which will not be repeated here. The communication apparatus 900 provided in the embodiments of the present application can implement each process implemented by the method embodiment of FIG. 6, and achieve the same technical effects, to avoid repetition, which will not be repeated here.

[0654] As shown in FIG. 10, the embodiments of the present application further provide a communication device 1000, including a processor 1001 and a memory 1002, the memory 1002 stores programs or instructions executable on the processor 1001, for example, when the communication device 1000 is a terminal, the programs or instructions are executed by the processor 1001 to implement each step of the above-mentioned method for determining timing advance, and achieve the same technical effects. When the communication device 1000 is a network side device, the programs or instructions are executed by the processor 1001 to implement each step of the above-mentioned communication method, and achieve the same technical effects, to avoid repetition, which will not be repeated here.

[0655] The embodiment of the present application further provides a terminal comprising a processor and a communication interface, wherein the communication interface is coupled with the processor, and the processor is used to run programs or instructions to realize the steps in the method embodiment shown in FIG. 3. The terminal embodiment corresponds to the terminal-side method embodiment described above, and each implementation process and implementation manner of the method embodiment described above can be applied to the terminal embodiment, and the same technical effects can be achieved. The terminal can be the timing advance determination apparatus shown in FIG. 8. Specifically, FIG. 11 is a schematic diagram of the hardware structure of a terminal for implementing the embodiment of the present application.

[0656] The terminal 1100 includes, but is not limited to, at least part of components such as a radio frequency unit 1101, a network module 1102, an audio output unit 1103, an input unit 1104, a sensor 1105, a display unit 1106, a user input unit 1107, an interface unit 1108, a memory 1109, and a processor 1110.

[0657] Those skilled in the art can understand that the terminal 1100 can further include a power supply (such as a battery) for supplying power to each component, and the power supply can be logically connected with the processor 1110 through a power management system, so as to realize functions such as management of charging, discharging, and power consumption management through the power management system. The terminal structure shown in FIG. 11 does not constitute a limitation on the terminal, and the terminal can include more or fewer components than those shown, or combine certain components, or different component arrangements, which will not be described here.

[0658] It should be understood that in the embodiment of the present application, the input unit 1104 can include a graphic processor 11041 and a microphone 11042, and the graphic processor 11041 processes image data of a still picture or a video obtained by an image capture device (such as a camera) in a video capture mode or an image capture mode. The display unit 1106 can include a display panel 11061, which can be configured in the form of a liquid crystal display, an organic light emitting diode, etc. The user input unit 1107 includes at least one of a touch panel 11071 and other input devices 11072. The touch panel 11071 is also called a touch screen. The touch panel 11071 can include two parts of a touch detection device and a touch controller. The other input devices 11072 can include, but are not limited to, a physical keyboard, function keys (such as volume control keys, on-off keys, etc.), a trackball, a mouse, a joystick, etc., which will not be described here.

[0659] In the embodiment of the present application, the radio frequency unit 1101 can transmit the downlink data received from the network side device to the processor 1110 for processing. In addition, the radio frequency unit 1101 can send uplink data to the network side device. Generally, the radio frequency unit 1101 includes but is not limited to an antenna, an amplifier, a transceiver, a coupler, a low noise amplifier, a duplexer, etc.

[0660] The memory 1109 can be used to store software programs or instructions and various data. The memory 1109 can mainly include a first storage area storing programs or instructions and a second storage area storing data, wherein the first storage area can store an operating system, at least one application program or instruction required by a function (such as a sound playing function, an image playing function, etc.), etc. In addition, the memory 1109 can include a volatile memory or a non-volatile memory. The non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM), a static random access memory (SRAM), a dynamic random access memory (DRAM), a synchronous dynamic random access memory (SDRAM), a double data rate synchronous dynamic random access memory (DDR SDRAM), an enhanced synchronous dynamic random access memory (ESDRAM), a synch link dynamic random access memory (SLDRAM) and a direct memory bus random access memory (DRRAM). The memory 1109 in the embodiment of the present application includes but is not limited to these and any other suitable type of memory.

[0661] The processor 1110 can include one or more processing units; optionally, the processor 1110 integrates an application processor and a modem processor, wherein the application processor mainly processes operations related to an operating system, a user interface and an application program, and the modem processor mainly processes wireless communication signals, such as a baseband processor. It can be understood that the above-mentioned modem processor can also not be integrated into the processor 1110.

[0662] The processor 1110 is configured to acquire a timing advance (TA) according to first information, wherein the first information comprises a value of the TA and / or information used to determine the value of the TA, and the TA is a TA between uplink and downlink, or the TA is a TA between uplink and a global navigation satellite system (GNSS).

[0663] The terminal provided in the embodiments of the present application can acquire the TA according to the first information. Since the first information comprises the value of the TA and / or information used to determine the value of the TA, the first information does not contain ephemeris information, and thus the dependence on ephemeris information can be eliminated when the TA is determined, so that the UE power consumption can be reduced and the spectrum efficiency can be improved.

[0664] It can be understood that the implementation processes of the implementation manners mentioned in the embodiments can refer to the related descriptions of the method embodiments and achieve the same or corresponding technical effects. To avoid repetition, they will not be described here again.

[0665] The embodiments of the present application further provide a network side device, which comprises a processor and a communication interface. The communication interface is coupled with the processor. The processor is configured to run programs or instructions to implement the steps of the method embodiments shown in FIG. 6. The network side device embodiments correspond to the network side device method embodiments described above. The implementation processes and implementation manners of the method embodiments described above can be applied to the network side device embodiments and achieve the same technical effects.

[0666] Specifically, the embodiments of the present application further provide a network side device, which can be the communication apparatus 900 shown in FIG. 9. As shown in FIG. 12, the network side device 1200 comprises an antenna 121, a radio frequency device 122, a baseband device 123, a processor 124 and a memory 125. The antenna 121 is connected with the radio frequency device 122. In the uplink direction, the radio frequency device 122 receives information through the antenna 121 and sends the received information to the baseband device 123 for processing. In the downlink direction, the baseband device 123 processes the information to be sent and sends it to the radio frequency device 122. The radio frequency device 122 processes the received information and sends it out through the antenna 121.

[0667] The method performed by the network side device in the above embodiments can be implemented in the baseband device 123, which comprises a baseband processor.

[0668] The baseband device 123 may, for example, comprise at least one baseband board, which is provided with a plurality of chips, as shown in FIG. 12. One of the chips is, for example, a baseband processor, which is connected with the memory 125 through a bus interface to call the programs in the memory 125 and perform the operations of the network side device shown in the above method embodiments.

[0669] The network-side device can further include a network interface 126, for example, a Common Public Radio Interface (CPRI).

[0670] Specifically, the network-side device 1200 of the embodiments of the present application further includes instructions or programs stored on the memory 125 and executable on the processor 124, the processor 124 invokes the instructions or programs in the memory 125 to perform the method performed by the modules shown in FIG. 9 and achieve the same technical effects. To avoid repetition, the details are not described here.

[0671] The embodiments of the present application also provide a readable storage medium, the readable storage medium stores programs or instructions, the programs or instructions are executed by a processor to implement various processes of the above-mentioned timing advance determination method or communication method embodiments and achieve the same technical effects. To avoid repetition, the details are not described here.

[0672] The processor is the processor in the terminal in the above-mentioned embodiments. The readable storage medium includes a computer readable storage medium, such as a computer readable memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, etc. In some examples, the readable storage medium can be a non-transitory readable storage medium.

[0673] The embodiments of the present application further provide a chip, the chip includes a processor and a communication interface, the communication interface and the processor are coupled, the processor is used to run programs or instructions to implement various processes of the above-mentioned timing advance determination method or communication method embodiments and achieve the same technical effects. To avoid repetition, the details are not described here.

[0674] It should be understood that the chip mentioned in the embodiments of the present application can also be referred to as a system chip, a system on chip, a chip system or a system on chip, etc.

[0675] The embodiments of the present application further provide a computer program / program product, the computer program / program product is stored in a storage medium, the computer program / program product is executed by at least one processor to implement various processes of the above-mentioned timing advance determination method or communication method embodiments and achieve the same technical effects. To avoid repetition, the details are not described here.

[0676] The embodiments of the present application further provide a communication system, including a terminal and a network-side device, the terminal can be used to execute the steps of the timing advance determination method shown in FIG. 3, and the network-side device can be used to execute the steps of the communication method shown in FIG. 6.

[0677] It should be noted that, in the present document, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. An element proceeded by "comprises a", "comprising", or the like does not, without more constraints, preclude the existence of additional identical elements in the process, method, article, or apparatus that comprises the element. Furthermore, it is to be understood that the methods and apparatuses of the present application can be carried out by specific hardware, by software, or by a combination of hardware and software. It is therefore, contemplated to this patent to cover any and all modifications, variations, or equivalents that fall within the scope of the present application. Accordingly, where a concept can have been illustrated in only one of the exemplary embodiments, various aspects of the concept can be modified and / or combined to produce a variety of other embodiments that are not specifically illustrated. Thus, for purposes of describing particular embodiments, reference has been made to orientations. However, it is to be understood that the teachings of this patent are not limited in their application to any one of the mentioned orientations, but are applicable to any assembly having the features currently described or hereinafter ascertained.

[0678] From the above description of the embodiments, it is apparent that the method of the above-mentioned embodiments can be realized by means of a computer software product and a general hardware platform as necessary, of course, also by hardware. The computer software product is stored in a storage medium (such as ROM, RAM, magnetic disc, optical disc, etc.), and includes a plurality of instructions for making a terminal or a network side device execute the method described in each embodiment of the present application.

[0679] The embodiments of the present application are described above in conjunction with the drawings, but the present application is not limited to the above-described specific embodiments, and the above-described specific embodiments are merely illustrative rather than restrictive, and a person of ordinary skill in the art can make many forms of embodiments under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims, and these embodiments all belong to the protection scope of the present application.

Claims

1. A method of determining timing advance, wherein, The method comprises: The terminal acquires a timing advance TA according to first information, wherein the first information comprises a value of the TA and / or information for determining the TA, the TA is a TA between uplink and downlink, or the TA is a TA between uplink and a global navigation satellite system GNSS.

2. The method of claim 1, wherein, The first information is acquired according to at least one of the following: A protocol definition; A network side device configuration; A network side device indication.

3. The method of claim 1 or 2, wherein, The TA comprises at least one of the following: A first TA, the first TA is one of a cell-specific TA, a beam-specific TA, a beam-common TA, a geographical area-specific TA and a geographical area-common TA, or the first TA is a TA from a reference position to a network side device; A second TA, the second TA is a terminal-specific common TA, or the second TA is a TA from a reference position to a satellite; A third TA, the third TA is a common TA, or the third TA is a TA from a satellite to a network side device; A fourth TA, the fourth TA is a terminal-specific TA, or the fourth TA is a TA from the terminal to a satellite; A fifth TA, the fifth TA is a TA indicated by a MAC CE, or the fifth TA comprises a TA indicated by a timing advance command TAC and / or a TA indicated by a random access response RAR; The network side device comprises a reference point RP or a base station.

4. The method according to any one of claims 1 to 3, wherein, The first information comprises at least one of the following: A TA reference value; A TA reference value corresponding to a reference time, wherein the TA reference value comprises one value or multiple values, and the reference time comprises one time or multiple times; A TA reference value corresponding to a reference position, wherein the TA reference value comprises one value or multiple values, and the reference position comprises one position or multiple positions; A TA reference value corresponding to a reference time and a reference position, wherein the TA reference value comprises one value or multiple values, the reference time comprises one time or multiple times, and the reference position comprises one position or multiple positions; A TA change rate, the TA change rate comprises at least one of a first-order change rate, a second-order change rate and a third-order change rate.

5. The method of claim 1, wherein, The terminal acquires the TA according to the first information, comprising: The terminal acquires the TA according to the first information and / or a first time; The first time is determined according to at least one of the following: The terminal acquires according to a global navigation satellite system GNSS; The terminal acquires according to a synchronization signal block SSB; The terminal acquires according to a channel state information reference signal CSI-RS; The terminal acquires according to first configuration information, wherein the first configuration information comprises at least one of the following: a system information block SIB, a master information block MIB, a radio resource control message RRC, a multimedia access control control unit MAC CE and downlink control information DCI; A network side device acquires; A sending time of uplink transmission; The terminal acquires according to a resource carrying uplink transmission.

6. The method of claim 5, wherein, The first information comprises a TA reference value and a TA change rate, and the terminal acquires the TA according to the first information and / or a first time, comprising: The terminal determines the TA according to the TA reference value, the TA change rate, and the first time.

7. The method of claim 6, wherein, The TA reference value is a value of the TA at a first reference time, or the TA reference value is a value of the TA corresponding to a first reference position at the first reference time. The first reference time includes at least one of the following: a time configured by the network-side device, a time in the serving cell information configured by the network-side device, a time in the neighbor cell information configured by the network-side device, a time at which the terminal receives the first information, a GNSS time at which the terminal receives the first information, and a downlink time at which the terminal receives the first information. The first reference position includes at least one of the following: a position configured by the network-side device, a position in the serving cell configured by the network-side device, a position in the neighbor cell configured by the network-side device, a predefined cell center position, and a position determined according to a predefined rule.

8. The method of claim 5, wherein, The first information includes a first list and a TA change rate, the first list includes a plurality of TA reference values of a plurality of reference positions at a first reference time, or the first list includes a plurality of TA reference values corresponding to a plurality of reference positions, wherein the terminal acquires the TA according to the first information and / or the first time, including: The terminal determines the TA according to the TA reference value corresponding to the second reference position in the first list and the TA change rate, and the first time. The second reference position is one of the plurality of reference positions, and the plurality of reference positions include at least one of the following: a position configured by the network-side device, a position in the serving cell configured by the network-side device, a position in the neighbor cell configured by the network-side device, a predefined cell center position, and a position determined according to a predefined rule. The first reference time includes at least one of the following: a time configured by the network-side device, a time in the serving cell information configured by the network-side device, a time in the neighbor cell information configured by the network-side device, a time at which the terminal receives the first information, a GNSS time at which the terminal receives the first information, and a downlink time at which the terminal receives the first information.

9. The method of claim 5, wherein, The first information includes a first list, the first list includes a plurality of TA reference values of a plurality of reference positions at a first reference time, or the first list includes a plurality of TA reference values corresponding to a plurality of reference positions, wherein the terminal acquires the TA according to the first information and / or the first time, including: The terminal determines the TA according to the TA reference value corresponding to the second reference position in the first list. The second reference position is one of the plurality of reference positions, and the plurality of reference positions include at least one of the following: a position configured by the network-side device, a position in the serving cell configured by the network-side device, a position in the neighbor cell configured by the network-side device, a predefined cell center position, and a position determined according to a predefined rule. The first reference moment comprises at least one of the following: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment when the terminal receives the first information, a GNSS moment when the terminal receives the first information, and a downlink moment when the terminal receives the first information.

10. The method of claim 5, wherein, The first information comprises a second list. The second list comprises a plurality of TA reference values of a first reference position at a plurality of reference moments, wherein the terminal acquires the TA according to the first information and / or a first moment, comprising: The terminal determines a second reference moment according to the first moment, wherein the second reference moment is one of the plurality of reference moments; The terminal determines the TA according to a reference value corresponding to the second reference moment in the second list. Alternatively, the second list comprises TA reference values corresponding to a plurality of reference moments, wherein the terminal acquires the TA according to the first information and / or a first moment, comprising: The terminal determines the TA according to a reference value corresponding to a second reference moment in the second list. The first reference position comprises at least one of the following: a position configured by the network-side device, a position in the serving cell configured by the network-side device, a position in the neighbor cell configured by the network-side device, a predefined cell center position, and a position determined according to a predefined rule; the plurality of reference moments comprises at least one of the following: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment when the terminal receives the first information, a GNSS moment when the terminal receives the first information, and a downlink moment when the terminal receives the first information.

11. The method of claim 5, wherein, The first information comprises a third list, and the third list comprises a plurality of TA reference values of a plurality of reference positions at a plurality of reference moments, wherein the terminal acquires the TA according to the first information and / or a first moment, comprising: The terminal determines a second reference moment according to the first moment, wherein the second reference moment is one of the plurality of reference moments; the plurality of reference moments comprises at least one of the following: a moment configured by the network-side device, a moment in the serving cell information configured by the network-side device, a moment in the neighbor cell information configured by the network-side device, a moment when the terminal receives the first information, a GNSS moment when the terminal receives the first information, and a downlink moment when the terminal receives the first information; The terminal determines the TA according to a TA reference value of a second reference position at the second reference moment in the third list, wherein the second reference position is one of the plurality of reference positions, and the plurality of reference positions comprises at least one of the following: a position configured by the network-side device, a position in the serving cell configured by the network-side device, a position in the neighbor cell configured by the network-side device, a predefined cell center position, and a position determined according to a predefined rule.

12. The method of claim 10 or 11, wherein, The second reference moment satisfies at least one of the following: a reference time instant in the plurality of reference time instants that is closest to the first time instant; a reference time instant in the plurality of reference time instants that is closest to the first time instant; a reference time instant in the plurality of reference time instants that is closest to the first time instant.

13. The method of any one of claims 8-9, 11, wherein, the second reference position satisfies any one of the following: a reference position in the plurality of reference positions that is closest to the terminal; one of the reference positions in the plurality of reference positions that has a distance to the terminal less than or equal to a first distance threshold; the first reference position is determined according to an index of second configuration information received by the terminal, wherein the index of the second configuration information includes at least one of a beam ID, an SSB index, and a channel state information reference signal (CSI-RS) index.

14. The method of claim 12, wherein, the position of the terminal is obtained according to at least one of the following: the terminal acquires according to a global navigation satellite system (GNSS); the terminal acquires according to positioning measurement; the network side device acquires.

15. The method of any one of claims 4, 7-14, wherein, a representation manner of the reference position includes any one of the following: latitude and longitude coordinates; latitude and longitude coordinates and height; a third reference position in the plurality of reference positions is represented by latitude and longitude coordinates, and a fourth reference position in the plurality of reference positions is represented by a value determined according to a latitude interval or a distance interval of the fourth reference position relative to the third reference position.

16. The method of claim 15, wherein, a determination manner of the latitude interval or the distance interval includes at least one of the following: protocol definition; network side device configuration; network side device indication; a value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identifier, an orbit identifier, and a distance between satellites on an orbit.

17. The method of any one of claims 4, 7 to 14, wherein, a representation manner of the reference time instant includes any one of the following: coordinated universal time (UTC); an earliest time instant in the plurality of reference time instants is UTC, and other time instants in the plurality of reference time instants are values determined according to a first time interval of the time instants relative to the earliest time instant; the plurality of reference time instants are system frame numbers (SFNs).

18. The method of claim 17, wherein, a determination manner of the first time interval includes at least one of the following: protocol definition; network side device configuration; network side device indication; a value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identifier, an orbit identifier, and a distance between satellites on an orbit.

19. The method of claim 1, wherein, the first information includes a TA reference value, wherein the terminal acquires the TA according to the first information, including: the terminal determines the TA according to the TA reference value.

20. The method of claim 19, wherein, the TA reference value is a value of a TA corresponding to a first reference time instant, wherein the first reference time instant includes at least one of the following: a time instant configured by the network side device, a time instant in serving cell information configured by the network side device, a time instant in neighbor cell information configured by the network side device, a time instant at which the terminal receives the first information, a GNSS time instant at which the terminal receives the first information, and a downlink time instant at which the terminal receives the first information.

21. The method of claim 1, wherein, the first information indicates that the TA is a preset value, wherein the terminal acquires the TA according to the first information, including: the terminal determines the TA according to the preset value.

22. The method of claim 1, wherein, If the serving cell of the terminal is a moving cell, the first information comprises at least one of: the TA reference value; the TA reference value at the first reference time; the first time; the satellite downtilt angle; the TA change rate; wherein the first time is at least one of: the sending time of the uplink transmission, the time configured by the network side device, the time in the serving cell information configured by the network side device, the time in the neighboring cell information configured by the network side device, the time when the terminal receives the first information, the GNSS time when the terminal receives the first information, and the downlink time when the terminal receives the first information; the first reference time comprises at least one of: the time configured by the network side device, the time in the serving cell information configured by the network side device, the time in the neighboring cell information configured by the network side device, the time when the terminal receives the first information, the GNSS time when the terminal receives the first information, and the downlink time when the terminal receives the first information.

23. The method of claim 22, wherein, The first information comprises the TA reference value at the first reference time and the first time, and the terminal acquires the TA according to the first information, comprising: the terminal determines the TA reference value at the first time according to the TA reference value at the first reference time, the first time, and the satellite downtilt angle, and determines the TA according to the TA reference value at the first time.

24. The method of any one of claims 1 to 23, wherein, The method further comprises at least one of: initialization of the first information; initialization of the TA.

25. The method of claim 24, wherein, The initialization of the TA and / or the first information comprises: the TA and / or the first information are initialized according to the first reference time and a second time interval, wherein the first reference time comprises at least one of: the time configured by the network side device, the time in the serving cell information configured by the network side device, the time in the neighboring cell information configured by the network side device, the time when the terminal receives the first information, the GNSS time when the terminal receives the first information, and the downlink time when the terminal receives the first information, and the second time interval represents the time for a satellite to serve one cell and / or the time for one beam to last.

26. The method of claim 24, wherein, The initialization of the TA and / or the first information comprises: the TA and / or the first information are initialized according to the first reference time and a fourth list, wherein the first reference time comprises at least one of: the time configured by the network side device, the time in the serving cell information configured by the network side device, the time in the neighboring cell information configured by the network side device, the time when the terminal receives the first information, the GNSS time when the terminal receives the first information, and the downlink time when the terminal receives the first information, and the fourth list contains the correspondence between different cells and a second time interval, and the second time interval represents the time for a satellite to serve one cell and / or the time for one beam to last.

27. The method of claim 25 or 26, wherein, The second time interval is determined according to at least one of: protocol definition; network side device configuration; network side device indication; A value determined according to at least one of a satellite orbit height, a satellite moving speed, a satellite downtilt angle, a satellite identity, an orbit identity, and a distance between satellites on an orbit.

28. The method of any one of claims 24 to 27, wherein, The initialization of the TA and / or the first information comprises: triggering the initialization of the TA and / or the first information in a case where a first condition is met, wherein the first condition comprises at least one of the following: Synchronization signal block (SSB) switching; Serving cell switching; Serving satellite switching; Network switching; Access network type change; Network configuring the TA and / or the first information initialization; Network indicating the TA and / or the first information initialization; Radio link failure; Radio link recovery; Radio link monitoring; Radio link beam failure; Radio link beam recovery.

29. The method of any one of claims 1 to 28, wherein, A specific manner in which the terminal acquires the TA according to the first information is determined according to at least one of the following: Network side device configuration or indication; Determination according to network type; Determination according to frequency spectrum information; Determination according to auxiliary information of the terminal, wherein the auxiliary information comprises information reported by the terminal device to the network side device; Determination according to terminal type.

30. A communication method, wherein, The method comprises: The network side device sends first information to the terminal, wherein the first information comprises a value of the TA and / or information used to determine the value of the TA, the TA being a TA between uplink and downlink, or the TA being a TA between uplink and global navigation satellite system (GNSS).

31. The method of claim 30, wherein, The TA comprises at least one of the following: A first TA, the first TA being one of a cell-specific TA, a beam-specific TA, a beam-common TA, a geographical area-specific TA, and a geographical area-common TA, or the first TA being a TA from a reference position to the network side device; A second TA, the second TA being a terminal-specific common TA, or the second TA being a TA from a reference position to a satellite; A third TA, the third TA being a common TA, or the third TA being a TA from a satellite to the network side device; A fourth TA, the fourth TA being a terminal-specific TA, or the fourth TA being a TA from the terminal to a satellite; A fifth TA, the fifth TA being a TA indicated by a MAC CE, or the fifth TA comprising a TA indicated by a timing advance command (TAC) and / or a TA indicated by a random access response (RAR); The network side device comprises a reference point (RP) or a base station.

32. The method of claim 30 or 31, wherein, The first information comprises at least one of the following: A TA reference value; A TA reference value corresponding to a reference time, wherein the TA reference value comprises one value or multiple values, and the reference time comprises one time or multiple times; A TA reference value corresponding to a reference position, wherein the TA reference value comprises one value or multiple values, and the reference position comprises one position or multiple positions; A TA reference value corresponding to a reference time and a reference position, wherein the TA reference value comprises one value or multiple values, the reference time comprises one time or multiple times, and the reference position comprises one position or multiple positions; A TA change rate, the TA change rate comprising at least one of a first-order change rate, a second-order change rate, and a third-order change rate.

33. A determination apparatus of timing advance, wherein, The method comprises: A TA obtaining module, configured to obtain a timing advance (TA) according to first information, wherein the first information comprises a value of the TA and / or information used to determine the value of the TA, and the TA is a TA between uplink and downlink or a TA between uplink and global navigation satellite system (GNSS).

34. A communications device, wherein, The method comprises: An information sending module, configured to send first information to a terminal, wherein the first information comprises a value of the TA and / or information used to determine the value of the TA, and the TA is a TA between uplink and downlink or a TA between uplink and global navigation satellite system (GNSS).

35. A terminal, wherein, A processor and a memory, wherein the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement steps of the method for determining timing advance according to any one of claims 1 to 29.

36. A network-side device, wherein, A processor and a memory, wherein the memory stores programs or instructions executable on the processor, and the programs or instructions are executed by the processor to implement steps of the method for determining timing advance according to any one of claims 30 to 32.

37. A readable storage medium, wherein, The readable storage medium stores programs or instructions, and the programs or instructions are executed by the processor to implement the method for determining timing advance according to any one of claims 1 to 29 or to implement steps of the method for determining timing advance according to any one of claims 30 to 32.

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