Timing advance compensation method, terminal, network device, communication system and medium

Abstract

Provided in the embodiments of the present disclosure are a timing advance compensation method, a terminal, a network device, a communication system and a medium. The method comprises: a terminal receiving first information sent by a network device, wherein the first information comprises at least one of the following: position information of an uplink time synchronization reference point and a third-order change rate of a common timing advance (common TA); and on the basis of the first information, the terminal compensating for a TA of a feed link in a non-terrestrial network (NTN). In the method of the present disclosure, a terminal receives first information sent by a network device to obtain position information of an uplink time synchronization reference point used for performing TA compensation and / or a third-order change rate of a common TA, and the terminal can more directly and accurately perform TA compensation on the basis of the position information, or the terminal reduces the error of TA compensation on the basis of the third-order change rate of the common TA, thereby improving the accuracy of TA compensation.

Description

Timing advance compensation method, terminal, network equipment, communication system and medium Technical Field

[0001] The present disclosure relates to the field of communication technologies, and in particular to a timing advance (TA) compensation method, terminal, network equipment, communication system, and medium. Background Art

[0002] In non-terrestrial networks (NTNs), terminals can access wireless resources via satellites to expand 5G network coverage. In NTNs, the movement of satellites requires terminals to compensate for timing advance (TA).

[0003] Summary of the Invention

[0004] In NTN high-frequency band scenarios, the requirements for TA accuracy are higher, and there is a lack of methods to improve TA accuracy.

[0005] Embodiments of the present disclosure provide a compensation method for a timing advance (TA), a terminal, a network device, a communication system, and a medium.

[0006] In a first aspect, an embodiment of the present disclosure provides a method for compensating a timing advance (TA), the method comprising:

[0007] The terminal receives first information sent by the network device, where the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common timing advance (common TA);

[0008] The terminal compensates for the TA of the feeder link in the non-terrestrial network NTN according to the first information.

[0009] In a second aspect, an embodiment of the present disclosure provides a TA compensation method, the method comprising:

[0010] The network device sends first information to the terminal, where the first information includes at least one of the following: location information of an uplink time synchronization reference point and a third-order change rate of a common TA; the first information is used by the terminal to compensate for the TA of a feeder link in the NTN.

[0011] In a third aspect, an embodiment of the present disclosure provides a terminal, including:

[0012] a transceiver module, configured to receive first information sent by a network device, wherein the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common TA;

[0013] A processing module is configured to compensate for the TA of the feeder link in the NTN according to the first information.

[0014] In a fourth aspect, an embodiment of the present disclosure provides a network device, including:

[0015] The transceiver module is used to send first information to the terminal, where the first information includes at least one of the following: location information of the uplink time synchronization reference point, and the third-order change rate of the common TA; the first information is used by the terminal to compensate for the TA of the feeder link in the NTN.

[0016] In a fifth aspect, an embodiment of the present disclosure provides a terminal, including:

[0017] one or more processors;

[0018] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the method described in the first aspect.

[0019] In a sixth aspect, an embodiment of the present disclosure provides a network device, including:

[0020] one or more processors;

[0021] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the method described in the second aspect.

[0022] In a seventh aspect, an embodiment of the present disclosure provides a communication system, comprising a network device and a terminal, wherein the terminal executes the method described in the first aspect, and the network device executes the method described in the second aspect.

[0023] In an eighth aspect, an embodiment of the present disclosure provides a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute the method described in the first aspect or the second aspect.

[0024] In the method disclosed herein, a terminal receives first information sent by a network device to obtain location information of an uplink time synchronization reference point used for TA compensation and / or a third-order change rate of a common TA. The terminal can perform TA compensation more directly and accurately based on the location information, or the terminal can reduce the error of TA compensation based on the third-order change rate of the common TA, thereby improving the accuracy of TA compensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following drawings required for describing the embodiments are introduced. The following drawings are merely some embodiments of the present disclosure and do not impose specific limitations on the protection scope of the present disclosure.

[0026] FIG1 is an exemplary schematic diagram of the architecture of a communication system provided according to an embodiment of the present disclosure;

[0027] FIG2 is an exemplary interaction diagram of a method provided according to an embodiment of the present disclosure;

[0028] FIG3a to FIG3c are exemplary flowcharts of a method according to an embodiment of the present disclosure;

[0029] FIG4a and FIG4b are exemplary flowcharts of a method according to an embodiment of the present disclosure;

[0030] FIG5a is a schematic structural diagram of a terminal according to an embodiment of the present disclosure;

[0031] FIG5b is a schematic structural diagram of a network device according to an embodiment of the present disclosure;

[0032] FIG6a is a schematic diagram of a communication device according to an embodiment of the present disclosure;

[0033] FIG6 b is a schematic diagram of a communication device according to an embodiment of the present disclosure. DETAILED DESCRIPTION

[0034] Embodiments of the present disclosure provide a timing advance compensation method, terminal, network device, communication system, and medium.

[0035] In a first aspect, an embodiment of the present disclosure provides a method for compensating a timing advance (TA), the method comprising:

[0036] The terminal receives first information sent by the network device, where the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common timing advance (common TA);

[0037] The terminal compensates for the TA of the feeder link in the non-terrestrial network NTN according to the first information.

[0038] In the above embodiment, the terminal receives the first information sent by the network device to obtain the position information of the uplink time synchronization reference point used for TA compensation and / or the third-order change rate of the common TA. The terminal can perform TA compensation more directly and accurately based on the position information, or the terminal can reduce the error of TA compensation based on the third-order change rate of the common TA, thereby improving the accuracy of TA compensation.

[0039] In conjunction with the embodiments of the first aspect, in some embodiments, the terminal receives first information sent by the network device, including:

[0040] The terminal receives a system information block SIB sent by a network device, where the SIB includes first information.

[0041] In the above embodiment, the terminal may receive the first information sent by the network device through the SIB, so as to promptly obtain relevant parameters for TA compensation.

[0042] In conjunction with the embodiments of the first aspect, in some embodiments, the SIB includes at least one of the following:

[0043] SIB19;

[0044] Other SIB information.

[0045] In the above embodiment, the terminal can receive the first information sent by the network device through SIB19 or other SIB information, multiplex existing signaling, and save signaling resources.

[0046] In combination with the embodiments of the first aspect, in some embodiments, the first information is location information, and SIB19 includes at least the first information and satellite ephemeris information.

[0047] In the above embodiment, the terminal receives the location information and ephemeris information sent by the network device through SIB19, so that the terminal can perform TA compensation according to the location information and ephemeris information.

[0048] In combination with the embodiments of the first aspect, in some embodiments, the first information is a third-order change rate, SIB19 includes at least the first information and common TA information, and the common TA information includes at least common TA.

[0049] In the above embodiment, the terminal receives the third-order change rate and common TA information sent by the network device through SIB19, so that the terminal can perform TA compensation more accurately according to the common TA and its various levels of change rate.

[0050] In combination with the embodiments of the first aspect, in some embodiments, the validity period of the first information is determined based on the first starting validity time and the first validity duration.

[0051] In the above embodiment, the terminal can determine the validity period of the first information based on the first starting validity period and the first validity period, so that the terminal can apply the first information within a reasonable range and is conducive to requesting or obtaining new first information at an appropriate time.

[0052] In combination with the embodiments of the first aspect, in some embodiments, the first starting effective time is the same as the starting effective time of the ephemeris information, and the first effective duration is the same as the effective duration of the ephemeris information.

[0053] In the above embodiment, the effective time of the first information may refer to the effective time of the ephemeris information, so that the effectiveness or update of the first information may be synchronized with the ephemeris information, thereby saving signaling resources.

[0054] In combination with the embodiments of the first aspect, in some embodiments, the first starting effective time is the starting effective time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

[0055] In the above embodiment, the validity period of the first information can be defined through network configuration or protocol, thereby facilitating improved flexibility in applying the first information.

[0056] In combination with the embodiments of the first aspect, in some embodiments, the first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

[0057] In the above embodiment, the validity period of the first information may refer to the effective time of the SIB, which is conducive to obtaining first information with a longer validity period. In scenarios involving modification of the first information, the terminal does not need to actively obtain it, saving terminal operations.

[0058] In conjunction with the embodiments of the first aspect, in some embodiments, the terminal compensates for the TA of the feeder link in the non-terrestrial network NTN according to the first information, including:

[0059] The terminal determines a compensation value of the TA of the feeder link according to the common TA, the first-order change rate of the common TA, the second-order change rate and the third-order change rate of the common TA.

[0060] In the above embodiment, the terminal determines the compensation value in combination with the TA and its multi-level change rate, which is conducive to more accurate TA compensation.

[0061] In conjunction with the embodiment of the first aspect, in some embodiments, the compensation value Delay common (t) Satisfy:

[0062] Among them, TA CommonDrift is the first-order rate of change, TA CommonDriftVariant is the second-order rate of change, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined.

[0063] In the above embodiment, the terminal determines the TA compensation value according to the third-order change rate. Increasing the third-order change rate is beneficial to reducing the error of TA compensation, thereby improving the accuracy of TA compensation.

[0064] In conjunction with the embodiments of the first aspect, in some embodiments, the uplink time synchronization reference point is at least one of the following:

[0065] The uplink time synchronization reference point corresponding to the terminal serving cell;

[0066] The uplink time synchronization reference point corresponding to the terminal's neighboring cell.

[0067] In the above embodiment, the terminal can perform TA compensation according to the location information of the uplink time synchronization reference point corresponding to the serving cell, or perform TA compensation according to the location information of the uplink time synchronization reference point corresponding to the neighboring cell, so that appropriate location information can be used when the terminal's location changes.

[0068] In conjunction with the embodiments of the first aspect, in some embodiments, the location information is location information of an uplink time synchronization reference point corresponding to a serving cell;

[0069] Among them, the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information. The second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

[0070] In the above embodiment, if the second information field indicating the location information corresponding to the neighboring cell does not appear in the handover information, the terminal may reuse the location information corresponding to the serving cell to perform TA compensation to ensure the accuracy of TA compensation.

[0071] In combination with the embodiments of the first aspect, in some embodiments, the location information includes longitude and latitude information, and the longitude and latitude information satisfies a set error condition.

[0072] In the above embodiment, by limiting the corresponding error conditions of the position information, it is possible to ensure that the position information is within a certain range, thereby facilitating the accuracy of TA compensation performed by the terminal.

[0073] In combination with the embodiments of the first aspect, in some embodiments, the first information includes a first information field, and the first information field is used to indicate a third-order change rate.

[0074] In the above embodiment, the third-order change rate is effectively indicated by adding a new first information field or reusing an existing information field as the first information field, so that the terminal can effectively know and apply the third-order change rate.

[0075] In a second aspect, an embodiment of the present disclosure provides a TA compensation method, the method comprising:

[0076] The network device sends first information to the terminal, where the first information includes at least one of the following: location information of an uplink time synchronization reference point and a third-order change rate of a common TA; the first information is used by the terminal to compensate for the TA of a feeder link in the NTN.

[0077] In conjunction with the embodiments of the second aspect, in some embodiments, the network device sending the first information to the terminal includes:

[0078] The network device sends an SIB to the terminal, where the SIB includes first information.

[0079] In conjunction with the embodiments of the second aspect, in some embodiments, the SIB includes at least one of the following:

[0080] SIB19;

[0081] Other SIB information.

[0082] In combination with the embodiments of the second aspect, in some embodiments, the first information is location information, and SIB19 includes at least the first information and satellite ephemeris information.

[0083] In combination with the embodiments of the second aspect, in some embodiments, the first information is a third-order change rate, SIB19 includes at least the first information and common TA information, and the common TA information includes at least common TA.

[0084] In combination with the embodiments of the second aspect, in some embodiments, the validity period of the first information is determined based on the first starting validity time and the first validity duration.

[0085] In combination with the embodiments of the second aspect, in some embodiments, the first starting effective time is the same as the starting effective time of the ephemeris information, and the first effective duration is the same as the effective duration of the ephemeris information.

[0086] In combination with the embodiments of the second aspect, in some embodiments, the first starting effective time is the starting effective time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

[0087] In combination with the embodiments of the second aspect, in some embodiments, the first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

[0088] In conjunction with the embodiment of the second aspect, in some embodiments, the compensation value Delay of the TA of the feeder link common (t) Satisfy:

[0089] Among them, TACommonDrift is the first-order rate of change of common TA, TA CommonDriftVariant is the second-order rate of change of common TA, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined.

[0090] In conjunction with the embodiments of the second aspect, in some embodiments, the uplink time synchronization reference point is at least one of the following:

[0091] The uplink time synchronization reference point corresponding to the terminal serving cell;

[0092] The uplink time synchronization reference point corresponding to the terminal's neighboring cell.

[0093] In conjunction with the embodiments of the second aspect, in some embodiments, the location information is location information of an uplink time synchronization reference point corresponding to a serving cell;

[0094] Among them, the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information. The second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

[0095] In combination with the embodiments of the second aspect, in some embodiments, the location information includes longitude and latitude information, and the longitude and latitude information satisfies a set error condition.

[0096] In combination with the embodiments of the second aspect, in some embodiments, the first information includes a first information field, and the first information field is used to indicate a third-order change rate.

[0097] In a third aspect, an embodiment of the present disclosure provides a terminal, including:

[0098] a transceiver module, configured to receive first information sent by a network device, wherein the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common TA;

[0099] A processing module is configured to compensate for the TA of the feeder link in the NTN according to the first information.

[0100] In a fourth aspect, an embodiment of the present disclosure provides a network device, including:

[0101] The transceiver module is used to send first information to the terminal, where the first information includes at least one of the following: location information of the uplink time synchronization reference point, and the third-order change rate of the common TA; the first information is used by the terminal to compensate for the TA of the feeder link in the NTN.

[0102] In a fifth aspect, an embodiment of the present disclosure provides a terminal, including:

[0103] one or more processors;

[0104] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the method described in the first aspect.

[0105] In a sixth aspect, an embodiment of the present disclosure provides a network device, including:

[0106] one or more processors;

[0107] A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the method described in the second aspect.

[0108] In a seventh aspect, an embodiment of the present disclosure provides a communication system, comprising a network device and a terminal, wherein the terminal executes the method described in the first aspect, and the network device executes the method described in the second aspect.

[0109] In an eighth aspect, an embodiment of the present disclosure provides a storage medium storing instructions, which, when executed on a communication device, enables the communication device to execute the method described in the first aspect or the second aspect.

[0110] In a ninth aspect, an embodiment of the present disclosure proposes a program product. When the program product is executed by a communication device, the communication device executes the method described in the optional implementation of the first and second aspects.

[0111] In a tenth aspect, an embodiment of the present disclosure proposes a computer program, which, when executed on a computer, enables the computer to execute the method described in the optional implementation of the first and second aspects.

[0112] In an eleventh aspect, an embodiment of the present disclosure provides a chip or a chip system, wherein the chip or chip system includes a processing circuit configured to execute the method described in the optional implementation of the first and second aspects above.

[0113] It is understandable that the above-mentioned terminals, network devices, communication systems, storage media, program products, computer programs, chips, or chip systems are all used to perform the methods proposed in the embodiments of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding methods and will not be repeated here.

[0114] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0115] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0116] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0117] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0118] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0119] In some embodiments, the terms "at least one," "one or more," "a plurality of," "multiple," etc. may be used interchangeably.

[0120] In some embodiments, descriptions such as "at least one of A and B," "A and / or B," "A in one case, B in another case," or "in response to one case A, in response to another case B" may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); and in some embodiments, A and B (both A and B are executed). The above is also applicable when there are more branches such as A, B, and C.

[0121] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0122] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0123] In some embodiments, “including A,” “comprising A,” “used to indicate A,” and “carrying A” can be interpreted as directly carrying A or indirectly indicating A.

[0124] In some embodiments, terms such as "in response to...", "in response to determining...", "in the case of...", "at the time of...", "when...", "if...", "if...", etc. can be used interchangeably.

[0125] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0126] In some embodiments, devices and equipment can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. In some cases, they can also be understood as "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", "subject", etc.

[0127] In some embodiments, "network" can be interpreted as devices included in the network, such as access network equipment, core network equipment, etc.

[0128] In some embodiments, "access network device (AN device)" may also be referred to as "radio access network device (RAN device)", "base station (BS)", "radio base station", "fixed station", and in some embodiments may also be understood as "node", "access point", "transmission point (TP)", "reception point (RP)", "transmission and / or reception point (TRP)" "panel", "antenna panel", "antenna array", "cell", "macro cell", "small cell", "femto cell", "pico cell", "sector", "cell group", "serving cell", "carrier", "component carrier", "bandwidth part (BWP)", etc.

[0129] In some embodiments, "terminal" or "terminal device" may be referred to as "user equipment (UE)", "user terminal" "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc.

[0130] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0131] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0132] In addition, each element, each row, or each column in the table of the embodiment of the present disclosure can be implemented as an independent embodiment, and the combination of any elements, any rows, and any columns can also be implemented as an independent embodiment.

[0133] FIG1 is a schematic diagram showing the architecture of a communication system according to an embodiment of the present disclosure.

[0134] As shown in FIG. 1 , a communication system 100 may be an NTN system. The communication system 100 may include a terminal 101 , a network device 102 , and a satellite 103 .

[0135] In some embodiments, the terminal 101 includes, for example, a mobile phone, a wearable device, an Internet of Things device, a car with communication function, a smart car, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical surgery, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, and at least one of a wireless terminal device in a smart home, but is not limited thereto.

[0136] In some embodiments, the network device 102 may include at least one of an access network device and a core network device.

[0137] In some embodiments, the access network device is, for example, a node or device that accesses a terminal to a wireless network. The access network device may include an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a node B (NB), a home node B (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open base station (Open RAN), a cloud base station (Cloud RAN), a base station in other communication systems, and at least one of an access node in a wireless fidelity (WiFi) system, but is not limited thereto.

[0138] In some embodiments, the technical solution of the present disclosure can be applied to the Open RAN architecture. In this case, the interfaces between or within the access network devices involved in the embodiments of the present disclosure can be transformed into internal interfaces of the Open RAN, and the processes and information interactions between these internal interfaces can be implemented through software or programs.

[0139] In some embodiments, the access network device can be composed of a centralized unit (CU) and a distributed unit (DU), where the CU can also be called a control unit. The CU-DU structure can be used to split the protocol layer of the access network device, with the functions of some protocol layers centrally controlled by the CU, and the functions of the remaining part or all of the protocol layers distributed in the DU, which is centrally controlled by the CU, but is not limited to this.

[0140] In some embodiments, a core network device may be a single device comprising one or more network elements, or may be a plurality of devices or a group of devices, each comprising all or part of one or more network elements. A network element may be virtual or physical. The core network may include, for example, at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN), and a Next Generation Core (NGC).

[0141] In some embodiments, the satellite 103 may also be referred to as a satellite base station, and the satellite 103 may be a satellite with different orbits, altitudes, and coverage areas.

[0142] In some embodiments, in an NTN, terminal 101 can connect to network device 102 via satellite 103. Network device 102 transmits wireless resources to terminal 101 via satellite 103. For example, satellite 103 transmits signals in transparent transmission mode. The link between terminal 101 and satellite 103 is a service link, and the link between satellite 103 and network device 102 is a feeder link.

[0143] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution provided by the embodiment of the present disclosure. Ordinary technicians in this field can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution provided by the embodiment of the present disclosure is also applicable to similar technical problems.

[0144] The following embodiments of the present disclosure may be applied to the communication system 100 shown in FIG. 1 , or a part of the main body thereof, but are not limited thereto.

[0145] The entities shown in Figure 1 are examples. The communication system may include all or part of the entities in Figure 1, and may also include other entities outside of Figure 1. The number and form of the entities are arbitrary. The connection relationship between the entities is an example. The entities may be connected or disconnected, and the connection may be in any manner, which may be direct or indirect, and may be wired or wireless.

[0146] The embodiments of the present disclosure can be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-A), LTE-Beyond (LTE-B), SUPER 3G, IMT-Advanced, 4th generation mobile communication system (4G), 5th generation mobile communication system (5G), 5G new radio (NR), future radio access (FRA), new radio access technology (RAT), new radio (NR), new radio access (NX), future generation radio access (FX), Global System for Mobile communications (GSM (registered trademark)), CDMA2000, Ultra Mobile Broadband (UMB), IEEE 802.11 (Wi-Fi (registered trademark)), IEEE 802.16 (WiMAX (registered trademark)), IEEE 802.20, Ultra-WideBand (UWB), Bluetooth (registered trademark), Public Land Mobile Network (PLMN) networks, Device-to-Device (D2D) systems, Machine-to-Machine (M2M) systems, Internet of Things (IoT) systems, Vehicle-to-Everything (V2X), systems utilizing other communication methods, and next-generation systems based on and extending these methods. Furthermore, multiple systems may be combined (for example, a combination of LTE or LTE-A with 5G).

[0147] In the disclosed embodiment, TA compensation in the NTN includes two parts: one part is the link between the terminal 101 and the satellite 103, and the terminal 101 calculates and compensates the TA of this part based on its own Global Navigation Satellite System (GNSS) position and the satellite position sent by the network device 102; the other part is the link between the satellite 103 and the network device 102, and the terminal 101 can perform TA compensation for this part through the satellite position and common timing advance (common TA) sent by the network device 102.

[0148] In the disclosed embodiments, in scenarios involving NTN high-frequency bands (e.g., the FR2-NTN band greater than 10 GHz), a higher sub-carrier spacing (SCS) is required during communication. A higher SCS corresponds to shorter symbols and cyclic prefixes (CPs), placing higher demands on TA accuracy. However, there is a lack of methods for achieving high TA accuracy in this scenario.

[0149] FIG2 is an interactive diagram of a TA compensation method according to an embodiment of the present disclosure. As shown in FIG2 , the embodiment of the present disclosure relates to a TA compensation method, the method comprising:

[0150] Step S2101 , the network device 102 sends first information to the terminal 101 .

[0151] In some embodiments, the network device 102 may be a ground base station such as a ground station or a gateway in the NTN.

[0152] Optionally, in the NTN system, the network device 102 and the terminal 101 may communicate via satellites 103 in different orbits, thereby expanding network coverage.

[0153] For example, network device 102 sends information to satellite 103, and satellite 103 does not demodulate the received information and transparently transmits it to terminal 101. In other embodiments, satellite 103 may also demodulate and decode the information received from network device 102, then re-encode and modulate it, and then transmit the processed information to terminal 101.

[0154] Optionally, the network device 102 may obtain ephemeris information of different satellites 103. For example, the satellite 103 reports its own ephemeris information to the network device 102. The network device 102 may carry the ephemeris information of the relevant satellites in the broadcasted system information for the terminal 101 to use.

[0155] In some embodiments, the first information includes location information of an uplink time synchronization reference point and / or a third-order variation rate of a common TA, where the third-order variation rate may be expressed as common TA third order or common TA third order variation.

[0156] In one example, the network device 102 may send first information including the location information.

[0157] In another example, the network device 102 may transmit the first information including the third-order rate of change.

[0158] In other examples, the network device 102 may send the first information including both the position information and the third-order change rate, or the network device 102 may use different first information to send the position information and the third-order change rate respectively. The present disclosure does not limit whether the network device 102 uses the same information to send the above parameters.

[0159] In some embodiments, the uplink time synchronization reference point is at least one of the following:

[0160] Uplink time synchronization reference point corresponding to the terminal serving cell;

[0161] The uplink time synchronization reference point corresponding to the terminal's neighbor cell.

[0162] For example, the uplink time synchronization reference point is a network device corresponding to the serving cell or the neighboring cell, such as a ground base station or a point on the ground. The first information may include location information corresponding to the uplink time synchronization reference point.

[0163] In some embodiments, the location information includes latitude and longitude information, and the latitude and longitude information satisfies a set error condition.

[0164] For example, the latitude and longitude information needs to be retained to a set number of decimal places, and / or the latitude and longitude information needs to ensure that the error is less than a set distance (such as X meters) to ensure the accuracy of the terminal 101 when performing TA compensation.

[0165] It is understandable that in the NTN scenario, there is a certain distance between the terminal 101 and the network device 102, and the reported location information meets the set error condition. When the location information is obtained, it can be ensured that the privacy of the network device 102 is not affected.

[0166] In some embodiments, common TA can be understood as the absolute value of common TA. Common TA corresponds to a first-order change rate, which is used to determine or describe the change of common TA in the time domain, such as the first-order change rate can be recorded as common TA drift or TA common drift; common TA also corresponds to a second-order change rate, which is used to determine or describe the change of the first-order change rate in the time domain, such as the second-order change rate can be recorded as common TA drift variation or TA common drift variation.

[0167] In this embodiment, the third-order rate of change is used to determine or describe the change of the second-order rate of change in the time domain.

[0168] Optionally, the common TA and its three change rates' value range, granularity, and bits allocation may be defined through protocol or configured in the network.

[0169] In some embodiments, the network device 102 may send the first information via Radio Resource Control (RRC).

[0170] In some embodiments, network device 102 sends a system information block (SIB) to terminal 101. The SIB includes first information. For example, the SIB includes at least one of the following: SIB19 and other SIB information other than SIB19. SIB19 may refer to a system message name used to transmit satellite-related information.

[0171] In an example, when the first information is the location information of the uplink time synchronization reference point, the network device 102 sends the location information of the uplink time synchronization reference point through the SIB.

[0172] In this example, the network device 102 may send the location information in SIB19. Optionally, SIB19 includes at least the location information and satellite ephemeris information, such as the network device 102 sending the location information and ephemeris information to the terminal 101 in the NTN config IE of SIB19.

[0173] Optionally, SIB19 is used to provide necessary information related to network coverage and signal transmission. SIB19 includes key information such as radio frequency and antenna information, cell attribute information, encoding and decoding information, etc.

[0174] Optionally, when the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, the network device 102 may configure its location information in the NTN configuration of SIB19, such as configuring the location information of the uplink time synchronization reference point corresponding to the neighboring cell in NTN-NeighCellConfig. For example, the location information of the uplink time synchronization reference point corresponding to the neighboring cell may be indicated by the second information field in NTN-NeighCellConfig.

[0175] Optionally, if the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information, the terminal 101 believes that the location information of the uplink time synchronization reference point corresponding to the serving cell can be reused, that is, the location information is the location information of the uplink time synchronization reference point corresponding to the serving cell, wherein the second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

[0176] The handover information is, for example, a handover message RRC.

[0177] In this example, the network device 102 may send the location information in other SIB information besides SIB19, such as in SIB20. Optionally, SIB20 is used to indicate necessary information related to the channel, such as RRC configuration information, physical downlink control channel (PDCCH) configuration information, dynamic resource allocation information, etc.

[0178] In another example, when the first information is the third-order change rate of the common TA, the network device 102 sends the third-order change rate of the common TA through the SIB.

[0179] In this example, the network device 102 may send the third-order change rate in SIB19. Optionally, SIB19 includes at least the third-order change rate and common TA information. For example, the network device 102 sends the third-order change rate along with the defined common TA information to the terminal 101 via SIB19. The common TA information includes at least the common TA. For example, the common TA information may include the common TA, the first-order change rate of the common TA, and the second-order change rate of the common TA.

[0180] In some embodiments, the first information includes a first information field, and the first information field is used to indicate a third-order rate of change.

[0181] Optionally, when the third-order change rate is sent through SIB19, SIB19 may include a first information field for indicating the third-order change rate.

[0182] Optionally, the first information field may occupy several bits, for example, 14 bits.

[0183] Optionally, the value range, granularity or bit allocation of the third-order rate of change may be defined by a protocol or configured by the network device 102 .

[0184] In some embodiments, when the above-mentioned position information and / or third-order rate of change are sent via SIB19, other information in SIB19 can still reuse existing transmission methods. For example, SIB19 also includes parameters Koffset, Kmac, and the validity period of related information.

[0185] In some embodiments, the terminal 101 receives the first information to obtain the location information and / or the third-order rate of change.

[0186] Step S2102: Terminal 101 determines the validity period of the first information.

[0187] In some embodiments, the validity period of the first information is determined according to the first starting validity period and the first validity period.

[0188] Optionally, the first starting time is the starting position of the valid time, and the first valid duration is the duration of the valid time, so that the valid time or valid duration of the first information can be determined based on the first starting valid time and the first valid duration.

[0189] Optionally, the first starting effective time and the first effective duration may be defined by a protocol or configured by the network device 102 .

[0190] In the first example, the first starting effective time is the same as the starting effective time (epoch time) of the ephemeris information, and the first valid time is the same as the valid time (validity timer) of the ephemeris information.

[0191] In this example, the first information such as the location information of the uplink time synchronization reference point or the third-order change rate of the common TA and the ephemeris information can use a common epoch time and validity timer, thereby reducing the configuration operations of the network device 102 or the processing operations of the terminal 101.

[0192] In the second example, the first effective start time is the effective start time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

[0193] In this example, the first starting effective time and the first effective duration of the first information are independent of or separately configured or defined as the epoch time and validity timer related to the ephemeris information, so that the network device 102 can more flexibly schedule the first information and the ephemeris information.

[0194] In this example, the first information may be location information of an uplink time synchronization reference point.

[0195] In the third example, the first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

[0196] In this example, the first starting effective time of the first information is, for example: after the terminal 101 receives the SIB carrying the first information and demodulates the SIB, that is, the effective time of the SIB.

[0197] In this example, the first effective duration of the first information satisfies, for example: after the terminal 101 applies the first information in the above SIB for a period of time, it receives a SIB carrying new first information such as location information, and the first effective duration of the first information lasts until the newly received SIB takes effect.

[0198] In this example, the first starting effective time and the first effective duration of the first information are determined in the same manner as the effective time of specific information other than the ephemeris information in the SIB. The specific information other than the ephemeris information in the SIB is, for example, the parameter Koffset. In this case, the effective time of this part of the specific information and the first information follows the normal SI modification procedure and may not be the same as the epoch time and validity timer of the ephemeris information.

[0199] In this example, the first information may be location information of an uplink time synchronization reference point.

[0200] Step S2103: Terminal 101 re-acquires the first information.

[0201] In some embodiments, if the first validity period corresponding to the first information times out, the terminal 101 may reacquire the first information.

[0202] For example, when the first information is sent together with the ephemeris information via SIB19, and the relevant valid time of the first information is the same as the epoch time and validity timer of the ephemeris information, after the validity timer times out, the terminal 101 can re-acquire new first information and new ephemeris information.

[0203] In some embodiments, the network device 102 may send new first information and new ephemeris information to the terminal 101 .

[0204] Step S2104: Terminal 101 compensates for the TA of the feeder link in the NTN according to the first information.

[0205] In some embodiments, when the first information is the location information of the uplink time synchronization reference point, the terminal 101 can calculate the TA compensation value (TA pre-compensation) based on the location information and the satellite ephemeris information to perform TA compensation. Optionally, the algorithm for the terminal 101 to determine the TA compensation value based on the two location information can be implemented based on the UE.

[0206] In some embodiments, when the first information is the third-order change rate of the common TA, the terminal may determine the compensation value of the TA of the feeder link according to the common TA, the first-order change rate of the common TA, the second-order change rate and the third-order change rate of the common TA.

[0207] Optionally, the compensation value Delay common (t) Satisfy:

[0208] Among them, TA CommonDrift is the first-order rate of change, TA CommonDriftVariant is the second-order rate of change, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined, that is, the current time.

[0209] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", and "field" can be used interchangeably.

[0210] In some embodiments, "obtain", "get", "get", "receive", "transmit", "bidirectional transmission", "send and / or receive" can be interchangeable, and can be interpreted as receiving from other entities, obtaining from protocols, obtaining from higher layers, obtaining by self-processing, autonomous implementation, etc.

[0211] In some embodiments, terms such as "send", "transmit", "report", "download", "transmit", "bidirectional transmission", "send and / or receive" can be used interchangeably.

[0212] In some embodiments, terms such as "uplink", "uplink", and "physical uplink" can be interchangeable, and terms such as "downlink", "downlink", and "physical downlink" can be interchangeable, and terms such as "side", "sidelink", "side communication", and "sidelink communication" can be interchangeable.

[0213] In some embodiments, the terms "downlink control information (DCI)", "downlink (DL) assignment", "DL DCI", "uplink (UL) grant", "UL DCI" and the like may be used interchangeably.

[0214] In some embodiments, terms such as "physical downlink shared channel (PDSCH)" and "DL data" can be used interchangeably, and terms such as "physical uplink shared channel (PUSCH)" and "UL data" can be used interchangeably.

[0215] In some embodiments, the terms "component carrier (CC)", "cell", "frequency carrier", "carrier frequency" and the like can be used interchangeably.

[0216] In some embodiments, terms such as "certain", "preset", "preset", "setting", "indicated", "a certain", "any", and "first" can be interchangeable. "Specific A", "preset A", "preset A", "setting A", "indicated A", "a certain A", "any A", and "first A" can be interpreted as A pre-specified in a protocol, etc., or as A obtained through setting, configuration, or indication, etc., or as specific A, a certain A, any A, or first A, etc., but not limited to this.

[0217] In some embodiments, the determination or judgment can be performed by a value represented by 1 bit (0 or 1), or by a true or false value (Boolean value) represented by true or false, or by comparison of numerical values ​​(for example, comparison with a predetermined value), but is not limited thereto.

[0218] In some embodiments, "not expecting to receive" can be interpreted as not receiving on time domain resources and / or frequency domain resources, or as not performing subsequent processing on the data after receiving it; "not expecting to send" can be interpreted as not sending, or as sending but not expecting the recipient to respond to the content sent.

[0219] The communication method involved in the embodiments of the present disclosure may include at least one of steps S2101 to S2104. For example, step S2101 may be implemented as an independent embodiment, steps S2101 and S2104 may be implemented as independent embodiments, steps S2101, S2102, and S2104 may be implemented as independent embodiments, but steps S2101 to S2104 are not limited thereto.

[0220] In some embodiments, steps S2102, S2103, and S2104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0221] In some embodiments, steps S2102 and S2103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0222] In some embodiments, step S2103 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0223] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 2 .

[0224] FIG3a is a flow chart of a TA compensation method according to an embodiment of the present disclosure. As shown in FIG3a, the embodiment of the present disclosure relates to a TA compensation method, which is executed by terminal 101 and includes:

[0225] Step S3101, obtain first information.

[0226] In some embodiments, optional implementations of step S3101 can refer to the optional implementations of step S2101 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0227] In some embodiments, the terminal 101 may obtain the first information from the network device 102, but is not limited thereto and may also obtain the first information from other entities.

[0228] Step S3102: Determine the validity period of the first information.

[0229] In some embodiments, optional implementations of step S3102 can refer to the optional implementations of step S2102 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0230] Step S3103: reacquire the first information.

[0231] In some embodiments, optional implementations of step S3103 can refer to the optional implementations of step S2103 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0232] Step S3104: Compensate the TA of the feeder link in the NTN according to the first information.

[0233] In some embodiments, optional implementations of step S3104 can refer to the optional implementations of step S2104 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0234] The communication method involved in the embodiments of the present disclosure may include at least one of steps S3101 to S3104. For example, step S3101 may be implemented as an independent embodiment, steps S3101 and S3104 may be implemented as independent embodiments, steps S3101, S3102, and S3104 may be implemented as independent embodiments, but steps S3101 to S3104 are not limited thereto.

[0235] In some embodiments, steps S3102, S3103, and S3104 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0236] In some embodiments, steps S3102 and S3103 are optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0237] In some embodiments, step S3103 is optional, and one or more of these steps may be omitted or replaced in different embodiments.

[0238] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3 a .

[0239] FIG3b is a flow chart of a TA compensation method according to an embodiment of the present disclosure. As shown in FIG3b, the embodiment of the present disclosure relates to a TA compensation method, which is executed by terminal 101 and includes:

[0240] Step S3201, obtain first information.

[0241] In some embodiments, optional implementations of step S3201 can refer to the optional implementations of step S2101 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0242] Step S3202: Determine the validity period of the first information.

[0243] In some embodiments, optional implementations of step S3202 can refer to the optional implementations of step S2102 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0244] Step S3203: Compensate the TA of the feeder link in the NTN according to the first information.

[0245] In some embodiments, optional implementations of step S3203 can refer to the optional implementations of step S2104 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0246] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3 b .

[0247] FIG3c is a flow chart of a TA compensation method according to an embodiment of the present disclosure. As shown in FIG3c, the embodiment of the present disclosure relates to a TA compensation method, which is executed by terminal 101 and includes:

[0248] Step S3301: Receive first information sent by a network device.

[0249] In some embodiments, optional implementations of step S3301 can refer to the optional implementations of step S2101 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0250] In some embodiments, the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common timing advance (common TA).

[0251] In some embodiments, the terminal receives a system information block SIB sent by a network device, where the SIB includes first information.

[0252] Optionally, the SIB includes at least one of the following:

[0253] SIB19;

[0254] Other SIB information.

[0255] In one example, the first information is location information, and SIB19 includes at least the first information and satellite ephemeris information.

[0256] In another example, the first information is a third-order change rate, and SIB19 includes at least the first information and common TA information, and the common TA information includes at least common TA.

[0257] In some embodiments, the validity period of the first information is determined according to the first starting validity period and the first validity period.

[0258] Optionally, the first starting effective time is the same as the starting effective time of the ephemeris information, and the first effective duration is the same as the effective duration of the ephemeris information.

[0259] Optionally, the first starting effective time is the starting effective time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

[0260] Optionally, the first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

[0261] In some embodiments, the uplink time synchronization reference point is at least one of the following:

[0262] The uplink time synchronization reference point corresponding to the terminal serving cell;

[0263] The uplink time synchronization reference point corresponding to the terminal's neighboring cell.

[0264] Optionally, the location information is location information of an uplink time synchronization reference point corresponding to the serving cell;

[0265] Among them, the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information. The second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

[0266] In some embodiments, the location information includes latitude and longitude information, and the latitude and longitude information satisfies a set error condition.

[0267] In some embodiments, the first information includes a first information field, and the first information field is used to indicate a third-order rate of change.

[0268] Step S3302: Compensate the TA of the feeder link in the NTN according to the first information.

[0269] In some embodiments, optional implementations of step S3302 can refer to the optional implementations of step S2104 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0270] In some embodiments, the terminal may determine the compensation value of the TA of the feeder link according to the common TA, the first-order change rate of the common TA, the second-order change rate and the third-order change rate of the common TA.

[0271] Optionally, the compensation value Delay common (t) Satisfy:

[0272] Among them, TA CommonDrift is the first-order rate of change, TA CommonDriftVariant is the second-order rate of change, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined.

[0273] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 3c.

[0274] FIG4a is a flow chart of a TA compensation method according to an embodiment of the present disclosure. As shown in FIG4a, the embodiment of the present disclosure relates to a TA compensation method, which is executed by the network device 102 and includes:

[0275] Step S4101, sending the first information.

[0276] In some embodiments, optional implementations of step S4101 can refer to the optional implementations of step S2101 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0277] In some embodiments, the network device 102 may send the first information to the terminal 101 , but is not limited thereto and may also send the first information to other entities.

[0278] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 4 a .

[0279] FIG4 b is a flow chart of a TA compensation method according to an embodiment of the present disclosure. As shown in FIG4 b , the embodiment of the present disclosure relates to a TA compensation method, which is executed by the network device 102 and includes:

[0280] Step S4201: Send first information to the terminal.

[0281] In some embodiments, optional implementations of step S4201 can refer to the optional implementations of step S2101 in Figure 2 and the description of related implementations in Figure 2, and will not be repeated here.

[0282] In some embodiments, the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common timing advance (common TA).

[0283] In some embodiments, the network device sends an SIB to the terminal, where the SIB includes the first information.

[0284] Optionally, the SIB includes at least one of the following:

[0285] SIB19;

[0286] Other SIB information.

[0287] In one example, the first information is location information, and SIB19 includes at least the first information and satellite ephemeris information.

[0288] In another example, the first information is a third-order change rate, and SIB19 includes at least the first information and common TA information, and the common TA information includes at least common TA.

[0289] In some embodiments, the validity period of the first information is determined according to the first starting validity period and the first validity period.

[0290] Optionally, the first starting effective time is the same as the starting effective time of the ephemeris information, and the first effective duration is the same as the effective duration of the ephemeris information.

[0291] Optionally, the first starting effective time is the starting effective time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

[0292] Optionally, the first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

[0293] In some embodiments, the compensation value of the TA of the feeder link is Delay common (t) Satisfy:

[0294] Among them, TA CommonDrift is the first-order rate of change of common TA, TA CommonDriftVariantis the second-order rate of change of common TA, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined.

[0295] In some embodiments, the uplink time synchronization reference point is at least one of the following:

[0296] The uplink time synchronization reference point corresponding to the terminal serving cell;

[0297] The uplink time synchronization reference point corresponding to the terminal's neighboring cell.

[0298] Optionally, the location information is location information of an uplink time synchronization reference point corresponding to the serving cell;

[0299] Among them, the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information. The second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

[0300] In some embodiments, the location information includes latitude and longitude information, and the latitude and longitude information satisfies a set error condition.

[0301] In some embodiments, the first information includes a first information field, and the first information field is used to indicate a third-order rate of change.

[0302] In some embodiments, reference may be made to other optional implementations described before or after the description corresponding to FIG. 4 b .

[0303] The TA compensation method provided by the embodiments of the present disclosure can improve the accuracy of UE compensation of the feeder link (the link between the satellite and the reference point) TA and reduce the error of TA compensation when using a higher subcarrier spacing in NTN. To facilitate understanding of the embodiments of the present disclosure, some specific examples are listed below:

[0304] Example 1:

[0305] The method for improving the TA accuracy of the UE compensating the feeder link may include the following optional methods:

[0306] Option 1: The NW indicates the location information of the reference point to the UE, where the reference point is an uplink synchronization reference point or an uplink time synchronization reference point, that is, the UE considers that uplink synchronization is achieved at this point.

[0307] Option 2: The NW sends the third-order change rate of the common TA to the UE (in the related art, the base station may only indicate the second-order change rate).

[0308] Example 2:

[0309] For Option 1, the uplink synchronization reference point location information is sent through SIB information, such as using the following optional methods:

[0310] Option a: Included in SIB19 (such as the NTN config IE in SIB19) and sent together with satellite ephemeris information;

[0311] Option b: Included in other SIB information, such as SIB20.

[0312] Example 3:

[0313] For Option 1, the validity period of the location information is determined by two values: epoch time and validity timer. Epoch time indicates the starting time of validity, and validity timer indicates the validity period.

[0314] The same validity time can be understood as the same epoch time and validity timer, as shown in the following optional methods.

[0315] Option x: Use the same epoch time and validity timer as the ephemeris information. When the validity timer expires, new position information needs to be obtained.

[0316] Option y: Similar to Koffset, the uplink synchronization reference point location information does not refer to the epoch time and validity timer, but follows the normal SI modification procedure.

[0317] Option z: Use a separate epoch time and validity timer that are independent of the satellite position.

[0318] Example 4:

[0319] For option 1, the location information of the uplink synchronization reference point of the neighboring cell is configured in NTN-NeighCellConfig in ntn-Config.

[0320] Optionally, if this field does not appear in NTN-NeighCellConfig, such as if the field indicating the location information of the neighboring cell uplink synchronization reference point does not appear in the handover message RRC, the UE considers that the uplink synchronization reference point location of the current serving cell can be reused.

[0321] Example 5:

[0322] For Option 1, the UE determines the TA compensation value of the feeder link based on the location information of the uplink synchronization reference point and the satellite location information. The specific algorithm can be implemented based on the UE.

[0323] Example 6:

[0324] For Option 1, the location information of the uplink synchronization reference point is represented by latitude and longitude information, retained to x decimal places and / or with an error less than X m. This has the advantage of ensuring the accuracy of TA pre-compensation calculation by the UE.

[0325] Example 7:

[0326] For option 2, the third-order change rate of the common TA is sent through SIB19 and sent together with the existing common TA information.

[0327] Example 8:

[0328] For Option 2, the validity period of the third-order rate of change of the common TA is the same as the ephemeris information and the existing common TA information. The validity period is determined by two values: epoch time and validity timer. The epoch time indicates the starting time of effectiveness, and the validity timer indicates the validity period.

[0329] Example 9:

[0330] For option 2, the third-order change rate of the common TA can be represented by X = [14 bits].

[0331] Example 10:

[0332] The UE determines the TA compensation value of the feeder link based on the third-order change rate of the common TA and the existing common TA information. The specific algorithm is as follows:

[0333] Based on the above example, a possible embodiment is listed below:

[0334] When a UE attempts to access an NTN cell, it receives the SIB19 broadcast by the base station. This SIB19 includes satellite ephemeris information, common TA information (common TA = 0), validity timer and epoch time, as well as Koffset, Kmac, and uplink time synchronization reference point location information. The UE considers the validity timer and epoch time to be valid only for the ephemeris and common TA information. Other information, including Koffset, Kmac, and uplink time synchronization reference point location information, follows normal SI modification procedures. Based on the uplink time synchronization reference point location information and satellite ephemeris information, the UE determines the TA compensation value for the feeder link.

[0335] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided, comprising units or modules for implementing each step performed by a terminal in any of the above methods. For another example, another apparatus is provided, comprising units or modules for implementing each step performed by a network device (e.g., an access network device, a core network function node, a core network device, etc.) in any of the above methods.

[0336] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0337] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0338] Figure 5a is a schematic diagram of the structure of a terminal according to an embodiment of the present disclosure. As shown in Figure 5a, terminal 5100 may include at least one of a transceiver module 5101 and a processing module 5102. In some embodiments, transceiver module 5101 is configured to receive first information sent by a network device, the first information including at least one of the following: location information of an uplink time synchronization reference point and a third-order rate of change of a common TA. Processing module 5102 is configured to compensate for the TA of a feeder link in the NTN based on the first information.

[0339] Optionally, the transceiver module 5101 is used to perform at least one of the communication steps such as sending and / or receiving performed by the terminal 101 in any of the above methods, which will not be described in detail here. Optionally, the processing module is used to perform at least one of the other steps performed by the terminal 101 in any of the above methods, which will not be described in detail here.

[0340] Figure 5b is a schematic diagram of the structure of a network device proposed in an embodiment of the present disclosure. As shown in Figure 5b, network device 5200 may include at least one of a transceiver module 5201 and a processing module 5202. In some embodiments, transceiver module 5201 is configured to send first information to a terminal. The first information includes at least one of the following: location information of an uplink time synchronization reference point and a third-order rate of change of a common TA. This first information is used by the terminal to compensate for the TA of a feeder link in an NTN.

[0341] Optionally, the transceiver module 5201 is configured to execute at least one of the communication steps of sending and / or receiving performed by the network device 102 in any of the above methods, which are not described in detail here. Optionally, the processing module is configured to execute at least one of the other steps performed by the network device 102 in any of the above methods, which are not described in detail here.

[0342] In some embodiments, the transceiver module may include a transmitting module and / or a receiving module, and the transmitting module and the receiving module may be separate or integrated. Optionally, the transceiver module may be interchangeable with the transceiver.

[0343] In some embodiments, the processing module can be a single module or can include multiple submodules. Optionally, the multiple submodules respectively execute all or part of the steps required to be executed by the processing module. Optionally, the processing module can be interchangeable with the processor.

[0344] Figure 6a is a schematic diagram of the structure of a communication device 6100 proposed in an embodiment of the present disclosure. Communication device 6100 can be a network device (e.g., an access network device, a core network device, etc.), a terminal (e.g., a user equipment, etc.), a chip, a chip system, or a processor that supports a network device implementing any of the above methods, or a chip, a chip system, or a processor that supports a terminal implementing any of the above methods. Communication device 6100 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0345] As shown in Figure 6a, the communication device 6100 includes one or more processors 6101. The processor 6101 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process the communication protocol and communication data, and the central processing unit can be used to control the communication device (such as a base station, a baseband chip, a terminal device, a terminal device chip, a DU or a CU, etc.), execute programs, and process program data. Optionally, the communication device 6100 is used to perform any of the above methods. Optionally, one or more processors 6101 are used to call instructions to enable the communication device 6100 to perform any of the above methods.

[0346] In some embodiments, the communication device 6100 further includes one or more transceivers 6102. When the communication device 6100 includes one or more transceivers 6102, the transceiver 6102 performs at least one of the communication steps, such as sending and / or receiving, in the above-described method, and the processor 6101 performs at least one of the other steps. In an optional embodiment, the transceiver may include a receiver and / or a transmitter, and the receiver and transmitter may be separate or integrated. Optionally, the terms transceiver, transceiver unit, transceiver, transceiver circuit, interface circuit, and interface may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0347] In some embodiments, the communication device 6100 further includes one or more memories 6103 for storing data. Alternatively, all or part of the memories 6103 may be located outside the communication device 6100. In alternative embodiments, the communication device 6100 may include one or more interface circuits 6104. Optionally, the interface circuits 6104 are connected to the memory 6102 and may be configured to receive data from the memory 6102 or other devices, or to send data to the memory 6102 or other devices. For example, the interface circuits 6104 may read data stored in the memory 6102 and send the data to the processor 6101.

[0348] The communication device 6100 described in the above embodiment may be a network device or a terminal, but the scope of the communication device 6100 described in the present disclosure is not limited thereto, and the structure of the communication device 6100 may not be limited by FIG. 6a. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit IC, or a chip, or a chip system or subsystem; (2) a collection of one or more ICs, optionally, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal device, an intelligent terminal device, a cellular phone, a wireless device, a handheld device, a mobile unit, an in-vehicle device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0349] FIG6b is a schematic diagram of the structure of a chip 6200 according to an embodiment of the present disclosure. If the communication device 6100 can be a chip or a chip system, reference can be made to the schematic diagram of the structure of the chip 6200 shown in FIG6b , but the present disclosure is not limited thereto.

[0350] The chip 6200 includes one or more processors 6201. The chip 6200 is configured to execute any of the above methods.

[0351] In some embodiments, chip 6200 further includes one or more interface circuits 6202. Terms such as interface circuit, interface, and transceiver pins may be used interchangeably. In some embodiments, chip 6200 further includes one or more memories 6203 for storing data. Alternatively, all or part of memory 6203 may be located external to chip 6200. Optionally, interface circuit 6202 is connected to memory 6203 and may be used to receive data from memory 6203 or other devices, or may be used to send data to memory 6203 or other devices. For example, interface circuit 6202 may read data stored in memory 6203 and send the data to processor 6201.

[0352] In some embodiments, the interface circuit 6202 performs at least one of the communication steps, such as sending and / or receiving, in the above-described method. For example, the interface circuit 6202 performing the communication steps, such as sending and / or receiving, in the above-described method means that the interface circuit 6202 performs data exchange between the processor 6201, the chip 6200, the memory 6203, or the transceiver device. In some embodiments, the processor 6201 performs at least one of the other steps.

[0353] The modules and / or devices described in various embodiments, such as virtual devices, physical devices, and chips, can be arbitrarily combined or separated according to circumstances. Optionally, some or all steps can also be performed collaboratively by multiple modules and / or devices, which is not limited here.

[0354] The present disclosure also proposes a storage medium having instructions stored thereon. When the instructions are executed on the communication device 6100, the communication device 6100 executes any of the above methods. Optionally, the storage medium is an electronic storage medium. Optionally, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. Optionally, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a transient storage medium.

[0355] The present disclosure also provides a program product, which, when executed by the communication device 6100, enables the communication device 6100 to perform any of the above methods. Optionally, the program product is a computer program product.

[0356] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods. Industrial Applicability

[0357] In the method disclosed herein, a terminal receives first information sent by a network device to obtain location information of an uplink time synchronization reference point used for TA compensation and / or a third-order change rate of a common TA. The terminal can perform TA compensation more directly and accurately based on the location information, or the terminal can reduce the error of TA compensation based on the third-order change rate of the common TA, thereby improving the accuracy of TA compensation.

Claims

1. A method for compensating a timing advance TA, the method comprising: The terminal receives first information sent by the network device, where the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common timing advance common TA; The terminal compensates for the TA of the feeder link in the non-terrestrial network NTN according to the first information.

2. The method of claim 1, wherein: The terminal receives first information sent by a network device, including: The terminal receives a system information block SIB sent by the network device, where the SIB includes the first information.

3. The method of claim 2, wherein: The SIB includes at least one of the following: SIB19; Other SIB information.

4. The method of claim 3, wherein: The first information is the location information, and the SIB19 includes at least the first information and the ephemeris information of the satellite.

5. The method of claim 3, wherein: The first information is the third-order change rate, the SIB19 includes at least the first information and common TA information, and the common TA information includes at least the common TA.

6. The method according to any one of claims 1 to 5, wherein: The validity period of the first information is determined according to the first starting validity period and the first validity period.

7. The method of claim 6, wherein: The first starting effective time is the same as the starting effective time of the ephemeris information, and the first effective duration is the same as the effective duration of the ephemeris information.

8. The method of claim 6, wherein: The first effective start time is the effective start time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

9. The method of claim 6, wherein: The first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

10. The method according to any one of claims 1 to 5, wherein: The terminal compensates the TA of the feeder link in the non-terrestrial network NTN according to the first information, including: The terminal determines a compensation value of the TA of the feeder link according to the common TA, the first-order change rate of the common TA, the second-order change rate of the common TA, and the third-order change rate.

11. The method of claim 10, wherein: The compensation value Delay common (t)Satisfy: Among them, TA CommonDrift is the first-order rate of change, TA CommonDriftVariant is the second-order rate of change, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined.

12. The method according to any one of claims 1 to 11, wherein: The uplink time synchronization reference point is at least one of the following: The uplink time synchronization reference point corresponding to the terminal serving cell; The uplink time synchronization reference point corresponding to the neighboring cell of the terminal.

13. The method of claim 12, wherein: The location information is the location information of the uplink time synchronization reference point corresponding to the serving cell; Among them, the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information, and the second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

14. The method according to any one of claims 1 to 11, wherein: The location information includes longitude and latitude information, and the longitude and latitude information meets a set error condition.

15. The method according to any one of claims 1 to 11, wherein: The first information includes a first information field, and the first information field is used to indicate the third-order change rate.

16. The method according to any one of claims 1 to 11, wherein: The terminal receives first information sent by a network device, including: The terminal receives the first information sent by the network device via a satellite.

17. A timing advance compensation method, the method comprising: The network device sends first information to the terminal, where the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common TA; The first information is used by the terminal to compensate for the TA of the feeder link in the NTN.

18. The method of claim 17, wherein: The network device sends first information to the terminal, including: The network device sends a SIB to the terminal, where the SIB includes the first information.

19. The method of claim 18, wherein: The SIB includes at least one of the following: SIB19; Other SIB information.

20. The method of claim 19, wherein: The first information is the location information, and the SIB19 includes at least the first information and the ephemeris information of the satellite.

21. The method of claim 19, wherein: The first information is the third-order change rate, the SIB19 includes at least the first information and common TA information, and the common TA information includes at least the common TA.

22. The method according to any one of claims 17 to 21, wherein: The validity period of the first information is determined according to the first starting validity period and the first validity period.

23. The method of claim 22, wherein: The first starting effective time is the same as the starting effective time of the ephemeris information, and the first effective duration is the same as the effective duration of the ephemeris information.

24. The method of claim 22, wherein: The first effective start time is the effective start time configured or defined for the location information, and the first effective duration is the effective duration configured or defined for the location information.

25. The method of claim 22, wherein: The first starting effective time is determined according to the effective time of the SIB carrying the first information, and the first effective duration is determined according to the effective time of the SIB carrying the modified first information.

26. The method according to any one of claims 17 to 21, wherein: The compensation value Delay of the TA of the feeder link common (t)Satisfy: Among them, TA CommonDrift is the first-order rate of change of the common TA, TA CommonDriftVariant is the second-order rate of change of the common TA, TA Commonthirdorder is the third-order rate of change, t epoch is the first starting effective time corresponding to the first information, and t is the time when the compensation value is determined.

27. The method according to any one of claims 17 to 26, wherein: The uplink time synchronization reference point is at least one of the following: The uplink time synchronization reference point corresponding to the terminal serving cell; The uplink time synchronization reference point corresponding to the neighboring cell of the terminal.

28. The method of claim 27, wherein: The location information is the location information of the uplink time synchronization reference point corresponding to the serving cell; Among them, the uplink time synchronization reference point is the uplink time synchronization reference point corresponding to the neighboring cell, and the second information field does not appear in the switching information, and the second information field is used to indicate the location information of the uplink time synchronization reference point corresponding to the neighboring cell.

29. The method according to any one of claims 17 to 26, wherein: The location information includes longitude and latitude information, and the longitude and latitude information meets a set error condition.

30. The method of any one of claims 17 to 26, wherein: The first information includes a first information field, and the first information field is used to indicate the third-order change rate.

31. The method of any one of claims 17 to 26, wherein: The network device sends first information to the terminal, including: The network device sends the first information to the terminal via a satellite.

32. A terminal, comprising: The transceiver module is used to receive first information sent by the network device, wherein the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common TA; The processing module is used to compensate the TA of the feeder link in the NTN according to the first information.

33. A network device comprising: The transceiver module is configured to send first information to the terminal, wherein the first information includes at least one of the following: location information of an uplink time synchronization reference point, and a third-order change rate of a common TA; The first information is used by the terminal to compensate for the TA of the feeder link in the NTN.

34. A terminal, comprising: one or more processors; A memory coupled to the one or more processors, the memory comprising executable instructions, and when the one or more processors execute the executable instructions, the terminal executes the method according to any one of claims 1 to 16.

35. A network device comprising: one or more processors; A memory coupled to the one or more processors, the memory comprising executable instructions, which, when executed by the one or more processors, causes the terminal to execute the method according to any one of claims 17 to 31.

36. A communication system, comprising a network device and a terminal, wherein: The terminal executes the method described in any one of claims 1 to 16, and the network device executes the method described in any one of claims 17 to 31.

37. A storage medium storing instructions, which, when executed on a communication device, causes the communication device to execute the method according to any one of claims 1 to 16 or any one of claims 17 to 31.

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