CN115211224A

CN115211224A - Communication method, communication device, communication equipment and storage medium

Info

Publication number: CN115211224A
Application number: CN202080004362.1A
Authority: CN
Inventors: 朱亚军; 洪伟; 王天佳; 李勇
Original assignee: Beijing University of Posts and Telecommunications; Beijing Xiaomi Mobile Software Co Ltd
Current assignee: Beijing University of Posts and Telecommunications; Beijing Xiaomi Mobile Software Co Ltd
Priority date: 2020-12-30
Filing date: 2020-12-30
Publication date: 2022-10-18
Anticipated expiration: 2040-12-30
Also published as: WO2022141162A1; CN115211224B

Abstract

A communication method is applied to a network side, and comprises the following steps: according to the auxiliary information of the terminal, issuing indication information of a ground fixed tracking area TFTA to which the terminal belongs; the auxiliary information includes at least: position information of the terminal and motion state information of the terminal.

Description

Communication method, communication device, communication equipment and storage medium

Technical Field

The present disclosure relates to the field of wireless communications technologies, but not limited to the field of wireless communications technologies, and in particular, to a communication method, an apparatus, a communication device, and a storage medium.

Background

In a 5G New Radio (NR) protocol, for a terminal in an idle state and a terminal in an inactive state, when downlink data needs to be sent to the terminal in a network, a paging message needs to be broadcast in a Tracking Area (TA) where the terminal is located, so as to page the terminal and send the downlink data to the terminal.

In a Non-Terrestrial network (NTN), when the Tracking Area where the terminal is located changes due to movement of the terminal or movement of a satellite in the NTN, the terminal needs to perform Tracking Area Update (TAU) so that the terminal can be tracked by the NTN.

Disclosure of Invention

The embodiment of the disclosure discloses a communication method, a communication device and a storage medium

According to a first aspect of the embodiments of the present disclosure, the present disclosure provides a communication method, where the method is applied to a network side, and the method includes:

according to the auxiliary information of the terminal, issuing indication information of a ground fixed tracking area TFTA to which the terminal belongs;

the auxiliary information at least comprises: the position information of the terminal and the motion state information of the terminal.

According to a second aspect of the embodiments of the present disclosure, there is provided a communication method, where the method is applied to a terminal, the method including:

receiving indication information of a TFTA to which a terminal belongs; wherein the TFTA is determined according to auxiliary information of a terminal; the auxiliary information at least comprises: the position information of the terminal and the motion state information of the terminal;

and performing TAU according to the indication information.

According to a third aspect of the embodiments of the present disclosure, there is provided a communication apparatus, where the apparatus is applied to a network side, the apparatus includes a first transmitting module, where the first transmitting module is configured to:

according to the auxiliary information of the terminal, issuing indication information of a TFTA to which the terminal belongs;

According to a fourth aspect of the embodiments of the present disclosure, there is provided a communication apparatus, wherein the apparatus is applied to a terminal, the apparatus includes a second receiving module and an updating module, wherein,

the second receiving module configured to: receiving indication information of a TFTA to which a terminal belongs; wherein the TFTA is determined according to auxiliary information of a terminal; the auxiliary information at least comprises: the position information of the terminal and the motion state information of the terminal;

the update module configured to: and performing TAU according to the indication information.

According to a fifth aspect of embodiments of the present disclosure, there is provided a communication apparatus including:

a processor;

a memory for storing the processor-executable instructions;

wherein the processor is configured to: when the executable instructions are executed, the method of any embodiment of the disclosure is realized.

According to a sixth aspect of embodiments of the present disclosure, there is provided a computer storage medium storing a computer-executable program which, when executed by a processor, implements the method of any of the embodiments of the present disclosure.

In the embodiment of the disclosure, according to the auxiliary information of the terminal, the indication information of the TFTA to which the terminal belongs is issued; the auxiliary information at least comprises: the position information of the terminal and the motion state information of the terminal. Here, since the indication information is determined according to the auxiliary information of the terminal, the TFTA to which the terminal belongs may be adapted to the location of the terminal and the motion status of the terminal. Compared with the method of setting the fixed TFTA for the terminal, in the wireless communication in the NTN, on one hand, the frequent TAU of the terminal caused by setting the fixed TFTA can be reduced; on the other hand, the TFTA can adapt to the position and the motion state of the terminal, and the efficiency of accurately paging the terminal can be improved.

Drawings

Fig. 1 is a block diagram illustrating a wireless communication system in accordance with an exemplary embodiment.

FIG. 2 is a schematic diagram illustrating a tracking area in accordance with an exemplary embodiment.

Fig. 3 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 4 is a schematic diagram illustrating updating a tracking area TA according to an example embodiment.

Fig. 5 is a schematic diagram illustrating updating a tracking area TA according to an exemplary embodiment.

Fig. 6 is a schematic diagram illustrating updating a tracking area TA according to an exemplary embodiment.

Fig. 7 is a flow diagram illustrating a communication method in accordance with an example embodiment.

Fig. 8 is a flow diagram illustrating a communication method in accordance with an example embodiment.

Fig. 9 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 10 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 11 is a flow diagram illustrating a communication method in accordance with an example embodiment.

Fig. 12 is a flow diagram illustrating a communication method in accordance with an example embodiment.

Fig. 13 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 14 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 15 is a flow diagram illustrating a communication method according to an example embodiment.

Fig. 16 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 17 is a schematic diagram illustrating updating a tracking area TA according to an example embodiment.

Fig. 18 is a flow diagram illustrating a communication method according to an example embodiment.

Fig. 19 is a flow diagram illustrating a method of communication according to an example embodiment.

Fig. 20 is a schematic diagram illustrating an apparatus of a communication method according to an example embodiment.

Fig. 21 is a schematic diagram illustrating an apparatus of a method of communication according to an example embodiment.

Fig. 22 is a schematic diagram illustrating a structure of a terminal according to an exemplary embodiment.

Fig. 23 is a block diagram illustrating a base station in accordance with an example embodiment.

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with embodiments of the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the disclosed embodiments, as detailed in the appended claims.

The terminology used in the embodiments of the present disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the present disclosure. As used in the disclosed embodiments and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It is to be understood that although the terms first, second, third, etc. may be used herein to describe various information in the embodiments of the present disclosure, such information should not be limited by these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of embodiments of the present disclosure. The word "if," as used herein, may be interpreted as "at \8230; \8230when" or "when 8230; \823030when" or "in response to a determination," depending on the context.

For the purposes of brevity and ease of understanding, the terms "greater than" or "less than" are used herein when characterizing a size relationship. But it will be understood by those skilled in the art that: the term "greater than" also covers the meaning of "greater than or equal to," and "less than" also covers the meaning of "less than or equal to.

Referring to fig. 1, a schematic structural diagram of a wireless communication system according to an embodiment of the present disclosure is shown. As shown in fig. 1, the wireless communication system is a communication system based on a mobile communication technology, and may include: a number of user equipments 110 and a number of base stations 120.

User device 110 may refer to, among other things, a device that provides voice and/or data connectivity to a user. The user equipment 110 may communicate with one or more core networks via a Radio Access Network (RAN), and the user equipment 110 may be an internet of things user equipment, such as a sensor device, a mobile phone (or referred to as a "cellular" phone), and a computer having the internet of things user equipment, and may be a fixed, portable, pocket, handheld, computer-included, or vehicle-mounted device, for example. For example, a Station (STA), a subscriber unit (subscriber unit), a subscriber Station (subscriber Station), a mobile Station (mobile), a remote Station (remote Station), an access point, a remote user equipment (remote), an access user equipment (access terminal), a user equipment (user terminal), a user agent (user agent), a user equipment (user device), or a user equipment (user equipment). Alternatively, user device 110 may also be a device of an unmanned aerial vehicle. Alternatively, the user device 110 may also be a vehicle-mounted device, for example, a vehicle computer with a wireless communication function, or a wireless user device externally connected to the vehicle computer. Alternatively, the user device 110 may be a roadside device, for example, a street lamp, a signal lamp or other roadside device with a wireless communication function.

The base station 120 may be a network side device in a wireless communication system. The wireless communication system may be the fourth generation mobile communication (4 g) system, which is also called Long Term Evolution (LTE) system; alternatively, the wireless communication system may be a 5G system, which is also called a new air interface system or a 5G NR system. Alternatively, the wireless communication system may be a next-generation system of a 5G system. Among them, the Access Network in the 5G system may be referred to as NG-RAN (New Generation-Radio Access Network, new Generation Radio Access Network).

The base station 120 may be an evolved node b (eNB) used in a 4G system. Alternatively, the base station 120 may be a base station (gNB) adopting a centralized distributed architecture in the 5G system. When the base station 120 adopts a centralized distributed architecture, it generally includes a Centralized Unit (CU) and at least two Distributed Units (DUs). A Packet Data Convergence Protocol (PDCP) layer, a Radio Link layer Control Protocol (RLC) layer, and a Media Access Control (MAC) layer are provided in the central unit; a Physical (PHY) layer protocol stack is disposed in the distribution unit, and the specific implementation manner of the base station 120 is not limited in the embodiment of the present disclosure.

The base station 120 and the user equipment 110 may establish a radio connection over a radio air interface. In various embodiments, the wireless air interface is based on a fourth generation mobile communication network technology (4G) standard; or the wireless air interface is based on a fifth generation mobile communication network technology (5G) standard, for example, the wireless air interface is a new air interface; alternatively, the wireless air interface may be a wireless air interface based on a 5G technology standard of a next generation mobile communication network.

In some embodiments, an E2E (End to End) connection may also be established between user devices 110. For example, in a vehicle to vehicle communication (V2X), a vehicle to roadside device (V2I) communication, a vehicle to road device (V2P) communication, and the like.

Here, the user equipment described above may be regarded as the terminal equipment of the following embodiments.

In some embodiments, the wireless communication system may further include a network management device 130.

Several base stations 120 are connected to the network management device 130, respectively. The network Management device 130 may be a Core network device in a wireless communication system, for example, the network Management device 130 may be a Mobility Management Entity (MME) in an Evolved Packet Core (EPC). Alternatively, the Network management device may also be other core Network devices, such as a Serving GateWay (SGW), a Public Data Network GateWay (PGW), a Policy and Charging Rules Function (PCRF), a Home Subscriber Server (HSS), or the like. The embodiment of the present disclosure is not limited to the implementation form of the network management device 130.

In order to better understand the technical solution described in any embodiment of the present disclosure, first, a wireless communication scenario is explained by an embodiment.

In the 5G NR, for a terminal in an idle state and a terminal in an inactive state, when downlink data needs to be transmitted to the terminal in a network, a concept of a Registration Area (RA) is introduced so that the network can page the terminal.

In one embodiment, the RA may be a set of TAs.

In one embodiment, each TA includes one or more cells.

In one embodiment, one cell can belong to only one TA.

In one embodiment, each TA corresponds to a geographic area.

In one embodiment, each TA is determined by a TA Identity (TAI, TA Identity).

In one embodiment, the TAI includes a Public Land Mobile Network (PLMN) and a Tracking Area Code (TAC).

In one embodiment, the network sends the PLMN and TAC to the terminal by means of broadcast system messages.

In one embodiment, a terminal is configured with multiple TAs via a network.

In one embodiment, the network configures the terminal with a TA List TAL (Tracking Area List).

In one embodiment, one TA list includes a plurality of TAs.

In one embodiment, when the terminal moves from TA1 (tracking area 1) to TA2 (tracking area 2), if TA2 is not in the TA list configured for the terminal by the network, the terminal needs to initiate a TAU.

In one embodiment, in response to the terminal initiating a TAU, the network configures the terminal with a new TA list to ensure that the network can track to the terminal.

In the related art, NTN communication having characteristics of wide coverage, strong disaster resistance, and large capacity, especially satellite communication, is rapidly developed.

In one embodiment, the NTN scenarios include those based on Geostationary orbit (GEO) satellites and those based on Non-Geostationary orbit (NGSO) satellites.

Here, compared with the terrestrial network, the NTN network based on the NGSO satellite has a feature that the location of the terrestrial cell is dynamically changed. This is because the spatial location of the NGSO satellite is dynamically changing over time, and accordingly the location of the terrestrial cells based on the satellite beams will also change.

In order to realize the position management of the terminal, a dynamic position management scheme based on a TA and a tracking area list is adopted in a 4G and/or 5G network so as to realize that a called terminal can be quickly found when a call or a service arrives and the terminal needs to be found.

In one embodiment, the TAL is managed by a Mobility Management Entity in the network responsible for Mobility Management functions, such as a Mobility Management Entity (MME) in a 4G network or an Access and Mobility Management Function (AMF) in a 5G network, according to the location of the terminal and a predetermined network policy.

In one embodiment, for location management, in the NTN, even stationary terminals may make frequent TAUs when mobile cells (e.g., cells of NGSO satellites) broadcast TAIs like terrestrial network cells.

In one embodiment, to reduce the terminal's frequent execution of TAUs, a TA is employed that is fixed relative to the ground. As shown in fig. 2, with a TA fixed relative to the ground, there may be multiple TAs fixed relative to the ground in one NTN cell at the same time. For example, relatively terrestrial fixed tracking areas TA1 to TA7 exist in the NTN satellite cell.

In one embodiment, the TA, which is fixed relative to the ground, may be located in whole or in part in the NTN cell.

As shown in fig. 3, the present embodiment provides a communication method, where the method is applied to a network side, and the method includes:

step 31, issuing indication information of TFTA to which the terminal belongs according to the auxiliary information of the terminal;

auxiliary information, comprising at least: position information of the terminal and motion state information of the terminal.

In some embodiments, the terminal may be, but is not limited to, a mobile phone, a wearable device, an in-vehicle terminal, a Road Side Unit (RSU), a smart home terminal, an industrial sensor device, and the like.

Here, the network in which the terminal communicates is an NTN network.

Here, the cell may be a cell of a satellite in the NTN.

In one embodiment, the satellite may be a base station in flight.

In one embodiment, the base station may be an access device for the terminal to access the NTN.

In some embodiments, the base stations may be various types of base stations.

Such as a base station of a third generation mobile communication (3G) network, a base station of a fourth generation mobile communication (4G) network, a base station of a fifth generation mobile communication (5G) network, or other evolved base station.

In an embodiment, the AMF on the network side may determine, according to the auxiliary information of the terminal, the indication information of the TFTA to which the terminal belongs, and issue the indication information through the base station.

In one embodiment, the cells of the satellite follow the satellite motion.

In one embodiment, the terminal has a relative motion speed with the NTN serving cell.

In one embodiment, the terminal remains stationary with respect to the ground and the NTN serving cell moves along a fixed trajectory with respect to the ground.

In one embodiment, the terminal moves relative to the ground and the NTN serving cell moves along a fixed trajectory relative to the ground.

In one embodiment, the terminal moves relative to the ground and the NTN serving cell remains stationary relative to the ground.

In one embodiment, the terminal and the satellite may be moving in opposite directions or in the same direction.

In one embodiment, the terminal has a positioning function. The terminal can acquire the location information of the terminal.

In one embodiment, the AMF receives the assistance information transmitted by the terminal through the base station.

In one embodiment, the assistance information transmitted by the terminal is received periodically.

In one embodiment, the terminal sends the assistance information to the network side in response to the terminal initially accessing the base station.

In one embodiment, the terminal sends the assistance information to the network side in response to the terminal registering.

In one embodiment, a network side receives a registration message carrying auxiliary information sent by a terminal.

In one embodiment, in response to receiving a registration message carrying auxiliary information sent by a terminal, indication information of a TFTA to which the terminal belongs is issued.

In one embodiment, the location information of the terminal is used to indicate where the terminal is located.

In one embodiment, the location information of the terminal may be location coordinates of a location where the terminal is located.

In one embodiment, the motion status information of the terminal is used to indicate the motion status of the terminal. Here, the motion status information of the terminal may be information associated with the motion of the terminal.

In one embodiment, the motion status information of the terminal includes at least one of:

the type information of the terminal indicates the motion capability of the terminal;

and motion record information of the terminal indicating at least one of a current motion situation of the terminal and a historical motion situation of the terminal.

In one embodiment, the movement capability of the terminal may be a capability of a movement speed of the terminal greater than a first speed threshold.

For example, the moving speed of the terminal is more than 10 m/s.

In one embodiment, the terminal is a first type terminal in response to the ability of the velocity of movement of the terminal to be greater than a first velocity threshold.

In one embodiment, the motion capability of the terminal may be a capability that a speed of motion of the terminal is less than a second speed threshold.

For example, the moving speed of the terminal is less than 10 m/s.

In one embodiment, the terminal is a second type terminal in response to the terminal's ability to move at a speed less than a second speed threshold.

In one embodiment, the current motion profile of the terminal may be a profile of the speed and/or direction of the current motion of the terminal.

For example, the current moving speed of the terminal is 10 m/s, and the moving direction of the terminal is the northeast direction.

In one embodiment, the historical motion profile of the terminal may be a profile of the speed and/or direction of motion of the terminal over a historical period of time.

For example, the average moving speed of the terminal in the past 10 minutes is 1 m/s, and the moving direction is the southwest direction.

In one embodiment, the AMF, which may be a network side, predicts a ground area that the terminal will pass through based on a machine learning algorithm model and auxiliary information.

In one embodiment, the predicted terrestrial region through which the terminal will pass may be determined as the TFTA.

Referring to fig. 4, the amf may determine that the TFTA of UE1 is TFTA #1 and the TFTA of UE2 is TFTA #2 according to the received assistance information of the terminal. Here, the assistance information includes position information, moving speed information, and moving direction information of the terminal.

Referring to fig. 5, it can be predicted that UE1 will pass through TFTA #1 and TFTA #2 according to the moving direction in the auxiliary information of terminal UE 1. Here, TFTA #1 and TFTA #2 are terrestrial areas through which the UE1 passes. Here, the assistance information includes position information, moving speed information, and moving direction information of the terminal.

In one embodiment, TFTA #1 includes 3 NTN cells; TFTA #2 includes 1 NTN cell.

In one embodiment, the AMF determines the TFTA based on the predicted terrestrial area that the terminal will pass through.

In one embodiment, for a terminal in an idle state and a terminal in an inactive state, when the network has downlink data to send to the terminal, a paging message is sent to the TA in order for the network to page the terminal. Here, TA is TFTA indicated by the indication information.

In one embodiment, the TA is TFTA. Here, the TFTA may be a fixed geographical area.

In one embodiment, each TFTA includes one or more cells.

In one embodiment, in the NTN, each TFTA includes a cell that varies according to time.

For example, at time a, the satellite is operating in position a, the TFTA includes cell 1 and cell 2; at time B, the satellite is operating in the B position, and the TFTA includes cell 3 and cell 4.

Referring to fig. 6, at time a, the satellite moves above TFTA #1, and TFTA #1 includes NTN cell 1, NTN cell 2, and NTN cell 3.

In one embodiment, NTN cell 1, NTN cell 2, and NTN cell 3 broadcast the TAI to TFTA # 1. Here, TAIs broadcast by the NTN cell 1, the NTN cell 2, and the NTN cell 3 are TAI #1, TAI #2, and TAI #3, respectively.

In one embodiment, the satellite moves on a predetermined orbit based on a predetermined speed, and the network side and/or the terminal may determine the NTN cell included in the TFTA at any time according to the predetermined orbit and the predetermined speed.

In one embodiment, the TFTA may be determined according to a region that the terminal may pass through, which is determined based on the supplementary information.

For example, if it is determined that the terminal will pass through the a area and the B area in the next time according to the current moving speed and direction of the terminal and the position of the terminal, the TFTA may be determined as the a area and the B area.

In one embodiment, the ground is divided into a plurality of zones. Wherein the TFTA is one or more of the plurality of regions.

In one embodiment, the terminal needs to take a TAU in response to the terminal moving out of the TFTA.

In one embodiment, the network configures the terminal with a list of TAs. The TA list includes a plurality of TFTAs.

In one embodiment, the TA list may be indicated by indication information.

In one embodiment, when the terminal moves from TFTA1 (terrestrial fixed tracking area 1) to TFTA2 (terrestrial fixed tracking area 2), the terminal needs to initiate a TAU if TFTA2 is not in the TA list configured by the network to the terminal.

In one embodiment, in response to initiating a TAU, the network configures the terminal with a new TA list. To ensure that the network can track to the terminal.

In the embodiment of the disclosure, indication information of a TFTA (trivial details ta) to which a terminal belongs is issued according to auxiliary information of the terminal; auxiliary information, comprising at least: position information of the terminal and motion state information of the terminal. Here, since the indication information is determined according to the supplementary information of the terminal, the TFTA to which the terminal belongs may be adapted to the location of the terminal and the motion status of the terminal. Compared with the method of setting the fixed TFTA for the terminal, in the wireless communication in the NTN, on one hand, the frequent TAU of the terminal caused by setting the fixed TFTA can be reduced; on the other hand, the TFTA can adapt to the position and the motion state of the terminal, and the efficiency of accurately paging the terminal can be improved.

It should be noted that, as can be understood by those skilled in the art, the methods provided in the embodiments of the present disclosure can be executed alone or together with some methods in the embodiments of the present disclosure or some methods in the related art.

As shown in fig. 7, the present embodiment provides a communication method, where the method is applied to a network side, and the method includes:

step 71, responding to the need of sending downlink data to the terminal in the non-connection state, and sending a paging message to the NTN cell in the TFTA indicated by the indication information.

In one embodiment, the unconnected state includes an idle state and an inactive state.

In one embodiment, in response to the core network having data to send to the terminal in the unconnected state, the NTN cell in the TFTA indicated by the indication information sends a paging message to page the terminal.

In one embodiment, each TFTA includes one or more NTN cells.

In one embodiment, the core network sends a paging message to multiple NTN cells.

In one embodiment, in the NTN, the cells included in each TFTA are time-varying.

In one embodiment, in response to the need to send downlink data, the core network may send a paging message to the NTN cell included in the current time point TFTA.

For example, at time a, the satellite is operating in position a, the TFTA includes cell 1 and cell 2; at time B, the satellite is operating in the B position, and the TFTA includes cell 3 and cell 4. At time B, the core network will send a paging message to cell 3 and cell 4 to page the terminal in response to the need to send downlink data.

As shown in fig. 8, in this embodiment, a communication method is provided, where the method is applied to a network side, and the method includes:

and step 81, determining one or more NTN cells in the TFTA indicated by the indication information at least according to the time information, the ephemeris information and the cell signal coverage area information.

In one embodiment, the ephemeris information includes at least one of: the satellite tracking system comprises satellite operation track information, satellite position information, satellite motion speed information and satellite operation orbit height information.

In one embodiment, the cell signal coverage area information may be area information of signal coverage of the satellite at different time instants.

For example, the cell signal coverage area information may be area information of beam coverage of the satellite at different time instants.

In one embodiment, the NTN cell within the TFTA at any time may be determined based on the ephemeris information and cell signal coverage area information.

In one embodiment, the NTN cell within the TFTA is determined according to a mapping relationship between the time information, the ephemeris information, the cell signal coverage area information, and the TFTA.

In one embodiment, the network side updates the mapping in real time.

For example, the mapping may be updated periodically.

In one embodiment, the period for updating the mapping relationship may be determined based on the velocity of the satellite relative to the ground.

In one embodiment, the period is less than the period threshold in response to the operational velocity of the satellite relative to the ground being greater than or equal to the velocity threshold.

In one embodiment, the period is greater than the period threshold in response to the operational speed of the satellite relative to the ground being less than or equal to the speed threshold.

In this way, the updating of the mapping relationship can be adapted to the operating speed of the satellite relative to the ground.

In one embodiment, in response to the need to send downlink data, a paging message for paging a terminal may be sent to the NTN cell of the TFTA determined according to the current time and the mapping relationship.

As shown in fig. 9, in this embodiment, a communication method is provided, where the method is applied to a network side, and the method includes:

step 91, receiving a registration request carrying auxiliary information.

Therefore, the auxiliary information is carried in the registration request, and the signaling compatibility of the registration request signaling can be improved.

In one embodiment, a registration request is sent to the network side in response to the terminal performing TAU.

In one embodiment, the registration request carries the position information of the terminal and the motion state information of the terminal.

As shown in fig. 10, the present embodiment provides a communication method, where the method is applied to a network side, and the method includes:

step 101, issuing a registration acceptance message carrying indication information of the TFTA according to the registration request.

Therefore, the indication information of the TFTA is carried in the registration receiving message to be sent, and the signaling compatibility of the registration receiving message can be improved.

In one embodiment, in response to receiving a registration request from the network side, a registration receive message carrying indication information of the TFTA is issued according to the registration request.

Thus, the terminal can receive the indication information of the TFTA in time.

As shown in fig. 11, the present embodiment provides a communication method, where the method is applied to a terminal, and the method includes:

step 111, receiving indication information of a TFTA to which a terminal belongs; wherein, the TFTA is determined according to the auxiliary information of the terminal; auxiliary information, comprising at least: position information of the terminal and motion state information of the terminal;

and step 112, performing TAU according to the indication information.

In some embodiments, the terminal may be, but is not limited to, a mobile phone, a wearable device, an in-vehicle terminal, a road side unit, a smart home terminal, an industrial sensing device, and the like.

Here, the network in which the terminal communicates is an NTN network.

Here, the cell may be a cell of a satellite in the NTN.

In one embodiment, the satellite may be a base station in flight.

In some embodiments, the base stations may be various types of base stations.

In one embodiment, the cells of the satellite follow the satellite motion.

In one embodiment, the terminal sends the assistance information to the network side.

In one embodiment, the terminal periodically transmits the auxiliary information to the network side.

In one embodiment, the assistance information is sent to the network side in response to the terminal initially accessing the base station.

In one embodiment, the assistance information is sent to the network side in response to the terminal registration.

In one embodiment, a registration message carrying assistance information is sent to a network side.

In one embodiment, the network side issues indication information of a TFTA to which the terminal belongs in response to receiving a registration message carrying auxiliary information sent by the terminal.

For example, the moving speed of the terminal is more than 10 m/s.

In one embodiment, the terminal is a first type terminal in response to a capability of a velocity of movement of the terminal being greater than a first velocity threshold.

For example, the moving speed of the terminal is less than 10 m/s.

In one embodiment, the AMF, which may be the network side, predicts the ground area that the terminal will pass through based on the machine learning algorithm model and the assistance information.

Referring to fig. 4 again, the amf may determine that the TFTA of UE1 is TFTA #1 and the TFTA of UE2 is TFTA #2 according to the received assistance information of the terminal. Here, the supplementary information includes position information, moving speed information, and moving direction information of the terminal.

Referring to fig. 5 again, it can be predicted that UE1 will pass through TFTA #1 and TFTA #2 according to the moving direction in the auxiliary information of terminal UE 1. Here, TFTA #1 and TFTA #2 are terrestrial areas through which the UE1 passes. Here, the supplementary information includes position information, moving speed information, and moving direction information of the terminal.

In one embodiment, TFTA #1 includes 3 NTN cells; TFTA #2 includes 1 NTN cell.

In one embodiment, the AMF determines the TFTA based on the predicted terrestrial area that the terminal will travel.

In one embodiment, the TFTA may be a fixed geographic area.

In one embodiment, each TFTA includes one or more cells.

In one embodiment, the ground is divided into a plurality of zones.

In one embodiment, the TFTA is one or more of a plurality of regions.

In one embodiment, the network configures the terminal with a list of TAs.

In one embodiment, the TA list includes a plurality of TFTAs.

In one embodiment, the TA list may be indicated by indication information.

In one embodiment, when the terminal moves from TFTA1 (terrestrial fixed tracking area 1) to TFTA2 (terrestrial fixed tracking area 2), the terminal needs to initiate a TAU if TFTA2 is not in the TA list configured for the terminal by the network.

It should be noted that, as can be understood by those skilled in the art, the method provided in the embodiment of the present disclosure may be executed alone, or may be executed together with some methods in the embodiment of the present disclosure or some methods in the related art.

As shown in fig. 12, the present embodiment provides a communication method, where the method is applied to a terminal, and the method includes:

and step 121, reporting the registration request carrying the auxiliary information.

In one embodiment, the registration request carries the position information of the terminal and the motion status information of the terminal.

As shown in fig. 13, the present embodiment provides a communication method, which is applied to a terminal, and the method includes:

step 131, receiving a registration acceptance message carrying the indication information of the TFTA issued according to the registration request.

Thus, the terminal can receive the indication information of the TFTA in time.

As shown in fig. 14, the present embodiment provides a communication method, which is applied to a terminal, and the method includes:

step 141, in response to the terminal being outside the TFTA indicated by the indication information, performing TAU.

In one embodiment, the terminal is outside the TFTA indicated by the indication information, and may be the TFTA indicated by the terminal movement-out indication information.

In one embodiment, when the terminal moves from TFTA1 (tracking area 1) to TFTA2 (tracking area 2), then the terminal needs to initiate a TAU.

In one embodiment, in response to initiating the TAU, the network configures the terminal with a new TFTA based on the assistance information to ensure that the network can track to the terminal.

As shown in fig. 15, the present embodiment provides a communication method, which is applied to a terminal, and the method includes:

and step 151, determining one or more NTN cells in the TFTA indicated by the indication information according to at least the time information, the ephemeris information and the cell signal coverage area information.

In one embodiment, the cell signal coverage area information may be area information of signal coverage of the satellite at different times.

In one embodiment, the terminal updates the mapping relationship in real time.

For example, the mapping may be updated periodically.

In one embodiment, the period is less than the period threshold in response to the operational speed of the satellite relative to the ground being greater than or equal to the speed threshold.

In this way, the update of the mapping relationship can be adapted to the operating speed of the satellite relative to the ground.

In one embodiment, in response to the need to send downlink data, the network side may send a paging message of the paging terminal to the NTN cell of the TFTA determined according to the current time and the mapping relationship.

As shown in fig. 16, the present embodiment provides a communication method, which is applied to a terminal, and the method includes:

step 161, in response to detecting the first tracking area identity TAI, determining that the terminal is located within the TFTA indicated by the indication information; wherein the first TAI is a TAI of any NTN cell of the one or more NTN cells;

or,

in response to detecting the second TAI, determining that the terminal is out of the TFTA indicated by the indication information; wherein the second TAI is different from a TAI of any of the one or more NTN cells.

In one embodiment, the network side broadcasts the TAI to the NTN cells.

In one embodiment, in the NTN, each TFTA includes NTN cells that vary according to time.

In one embodiment, the terminal updates the mapping relationship in real time.

The mapping may be updated periodically.

In an embodiment, the terminal may determine the NTN cell included in the TFTA at each time according to the mapping relationship.

In one embodiment, it may be determined that the terminal is within the TFTA indicated by the indication information in response to detecting the TAI of the NTN cell included at the current time within the TFTA indicated by the indication information.

In one embodiment, the TAI of the NTN cell is periodically detected according to the mapping relationship. Here, the TAI of the NTN cell may be the TAI of the intra-TFTA NTN cell indicated by the indication information, or may not be the TAI of the intra-TFTA NTN cell indicated by the indication information.

In this way, it can be determined in real time whether the terminal is located in the TFTA indicated by the indication information.

In one embodiment, it may be determined that the terminal is outside the TFTA indicated by the indication information in response to detecting the second TAI.

In one embodiment, in response to the terminal being outside the TFTA indicated by the indication information, the network side cannot page the terminal in the TFTA, and the terminal needs to perform TAU.

Referring to fig. 17, at time a, TFTA #1 includes NTN cell 1, NTN cell 2, and NTN cell 3.NTN cell 1, NTN cell 2, and NTN cell 3 broadcast TAI to TFTA #1, respectively. TAI broadcast to TFTA #1 by NTN cell 1, NTN cell 2, and NTN cell 3 are TAI #1, TAI #2, and TAI #3, respectively.

As shown in fig. 18, the present embodiment provides a communication method, where the method is applied to a terminal, and the method includes:

step 181, determining that the terminal is outside the TFTA indicated by the indication information in response to that the time length of the terminal in the TFTA is greater than or equal to the predicted time length;

wherein the predicted duration is determined according to the auxiliary information of the terminal.

and the motion record information of the terminal indicates the current motion condition of the terminal and/or the historical motion condition of the terminal.

In one embodiment, the terminal may determine the predicted duration based on the aiding information and a neural network model.

In one embodiment, in response to the terminal being within the predicted duration after the predicted duration is determined, the terminal is within the TFTA indicated by the indication information; and responding to the situation that the terminal is out of the TFTA indicated by the indication information out of the predicted time length after the predicted time length is determined.

For a better understanding of the disclosed embodiments, a communication method is illustrated by an exemplary embodiment.

Example 1: referring to fig. 19, a wireless communication system includes: a terminal, a base station and an AMF.

Example 1 provides a method of communication, the method comprising:

step 1, the terminal reports a registration request carrying auxiliary information to the AMF through the base station.

Wherein the auxiliary information at least comprises: position information of the terminal and motion state information of the terminal.

And 2, according to the auxiliary information of the terminal, the AMF issues the indication information of the TFTA to which the terminal belongs through the base station.

And 3, the terminal enters a non-connection state.

And 4, responding to the requirement of sending downlink data to the terminal in the non-connection state, and sending a paging message by the AMF in the non-ground network NTN cell in the TFTA indicated by the indication information.

And 5, when the terminal moves out of the TFTA, the terminal performs TAU. Here, the terminal may perform TAU by sending a registration request carrying the auxiliary information to the network side.

As shown in fig. 20, the communication apparatus provided in the embodiment of the present disclosure, where the communication apparatus is applied to a network side, the apparatus includes a first sending module 201, where the first sending module 201 is configured to:

issuing indication information of a TFTA (transport format association) to which the terminal belongs according to the auxiliary information of the terminal;

In one embodiment, the first sending module 201 is further configured to: the motion state information of the terminal comprises at least one of the following:

In one embodiment, the first sending module 201 is further configured to:

and responding to the downlink data needing to be sent to the terminal in the non-connection state, and sending a paging message to the non-terrestrial network NTN cell in the TFTA indicated by the indication information.

In one embodiment, the apparatus further comprises a first determining module 202, wherein the first determining module 202 is configured to:

and determining one or more NTN cells in the TFTA indicated by the indication information according to at least the time information, the ephemeris information and the cell signal coverage area information.

In an embodiment, the apparatus further includes a first receiving module 203, where the first receiving module 203 is configured to receive a registration request carrying the auxiliary information.

In one embodiment, the first sending module 201 is further configured to:

and issuing a registration acceptance message carrying the indication information of the TFTA according to the registration request.

As shown in fig. 21, the communication apparatus provided in the embodiment of the present disclosure is applied to a terminal, and the apparatus includes a second receiving module 211 and an updating module 212, wherein,

a second receiving module 211 configured to: receiving indication information of a TFTA to which a terminal belongs; wherein, the TFTA is determined according to the auxiliary information of the terminal; auxiliary information, comprising at least: position information of the terminal and motion state information of the terminal;

an update module 212 configured to: and performing TAU according to the indication information.

In one embodiment, the second receiving module 211 is further configured to: the motion state information of the terminal comprises at least one of the following:

In an embodiment, the apparatus further includes a second sending module 213, where the second sending module 213 is configured to report the registration request carrying the auxiliary information.

In one embodiment, the second receiving module 211 is further configured to:

and receiving a registration acceptance message which is issued according to the registration request and carries the indication information of the TFTA.

In one embodiment, the update module 212 is further configured to:

and responding to the terminal being out of the TFTA indicated by the indication information to carry out TAU.

In one embodiment, the apparatus further comprises a second determining module 214, wherein the second determining module 214 is further configured to:

In one embodiment, the second determining module 214 is further configured to:

in response to detecting the first Tracking Area Identity (TAI), determining that the terminal is within the TFTA indicated by the indication information; wherein, the first TAI is a TAI of any NTN cell of the one or more NTN cells;

or,

In one embodiment, the apparatus further comprises a third determining module 215, wherein the third determining module 215 is configured to:

in response to the fact that the time length of the terminal in the TFTA is larger than or equal to the predicted time length, the terminal is determined to be out of the TFTA indicated by the indication information;

With regard to the apparatus in the above-described embodiment, the specific manner in which each module performs the operation has been described in detail in the embodiment related to the method, and will not be elaborated here.

An embodiment of the present disclosure provides a communication device, including:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to: when used to execute executable instructions, implement the methods applied to any embodiment of the present disclosure.

The processor may include, among other things, various types of storage media, which are non-transitory computer storage media capable of continuing to remember the information stored thereon after a power loss to the communication device.

The processor may be connected to the memory via a bus or the like for reading the executable program stored on the memory.

Embodiments of the present disclosure also provide a computer storage medium, where the computer storage medium stores a computer executable program, and the computer executable program, when executed by a processor, implements the method of any embodiment of the present disclosure.

As shown in fig. 22, one embodiment of the present disclosure provides a structure of a terminal.

Referring to fig. 22, the present embodiment of a terminal 800 provides a terminal 800, which may be embodied as a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, and the like.

Referring to fig. 22, terminal 800 may include one or more of the following components: processing component 802, memory 804, power component 806, multimedia component 808, audio component 810, input/output (I/O) interface 812, sensor component 814, and communication component 816.

The processing component 802 generally controls overall operation of the terminal 800, such as operations associated with display, telephone calls, data communications, camera operations, and recording operations. The processing components 802 may include one or more processors 820 to execute instructions to perform all or a portion of the steps of the methods described above. Further, the processing component 802 can include one or more modules that facilitate interaction between the processing component 802 and other components. For example, the processing component 802 may include a multimedia module to facilitate interaction between the multimedia component 808 and the processing component 802.

The memory 804 is configured to store various types of data to support operation at the device 800. Examples of such data include instructions for any application or method operating on terminal 800, contact data, phonebook data, messages, pictures, videos, and so forth. The memory 804 may be implemented by any type or combination of volatile or non-volatile memory devices such as Static Random Access Memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disks.

A power supply component 806 provides power to the various components of the terminal 800. Power components 806 may include a power management system, one or more power sources, and other components associated with generating, managing, and distributing power for terminal 800.

The multimedia component 808 includes a screen that provides an output interface between the terminal 800 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive an input signal from a user. The touch panel includes one or more touch sensors to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 808 includes a front facing camera and/or a rear facing camera. The front-facing camera and/or the rear-facing camera may receive external multimedia data when the device 800 is in an operating mode, such as a shooting mode or a video mode. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

The audio component 810 is configured to output and/or input audio signals. For example, the audio component 810 includes a Microphone (MIC) configured to receive external audio signals when the terminal 800 is in an operational mode, such as a call mode, a recording mode, and a voice recognition mode. The received audio signals may further be stored in the memory 804 or transmitted via the communication component 816. In some embodiments, audio component 810 also includes a speaker for outputting audio signals.

The I/O interface 812 provides an interface between the processing component 802 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to: a home button, a volume button, a start button, and a lock button.

Sensor assembly 814 includes one or more sensors for providing various aspects of state assessment for terminal 800. For example, sensor assembly 814 can detect an open/closed state of device 800, a relative positioning of components, such as a display and keypad of terminal 800, sensor assembly 814 can also detect a change in position of terminal 800 or a component of terminal 800, the presence or absence of user contact with terminal 800, orientation or acceleration/deceleration of terminal 800, and a change in temperature of terminal 800. Sensor assembly 814 may include a proximity sensor configured to detect the presence of a nearby object in the absence of any physical contact. The sensor assembly 814 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 814 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

The communication component 816 is configured to facilitate communications between the terminal 800 and other devices in a wired or wireless manner. The terminal 800 may access a wireless network based on a communication standard, such as Wi-Fi,2G, or 3G, or a combination thereof. In an exemplary embodiment, the communication component 816 receives a broadcast signal or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 816 further includes a Near Field Communication (NFC) module to facilitate short-range communications. For example, the NFC module may be implemented based on Radio Frequency Identification (RFID) technology, infrared data association (IrDA) technology, ultra Wideband (UWB) technology, bluetooth (BT) technology, and other technologies.

In an exemplary embodiment, the terminal 800 may be implemented by one or more Application Specific Integrated Circuits (ASICs), digital Signal Processors (DSPs), digital Signal Processing Devices (DSPDs), programmable Logic Devices (PLDs), field Programmable Gate Arrays (FPGAs), controllers, micro-controllers, microprocessors or other electronic components for performing the above-described methods.

In an exemplary embodiment, a non-transitory computer-readable storage medium comprising instructions, such as the memory 804 comprising instructions, executable by the processor 820 of the terminal 800 to perform the above-described method is also provided. For example, the non-transitory computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

As shown in fig. 23, an embodiment of the present disclosure shows a structure of a base station. For example, the base station 900 may be provided as a network side device. Referring to fig. 23, base station 900 includes a processing component 922, which further includes one or more processors and memory resources, represented by memory 932, for storing instructions, such as applications, that may be executed by processing component 922. The application programs stored in memory 932 may include one or more modules that each correspond to a set of instructions. Further, processing component 922 is configured to execute instructions to perform any of the methods described above as applied to the base station.

The base station 900 may also include a power supply component 926 configured to perform power management of the base station 900, a wired or wireless network interface 950 configured to connect the base station 900 to a network, and an input/output (I/O) interface 958. The base station 900 may operate based on an operating system stored in memory 932, such as Windows Server (TM), mac OS XTM, unixTM, linuxTM, freeBSDTM, or the like.

Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.

It will be understood that the invention is not limited to the precise arrangements that have been described above and shown in the drawings, and that various modifications and changes can be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.

Claims

A communication method is applied to a network side, and comprises the following steps:

according to the auxiliary information of the terminal, issuing indication information of a ground fixed tracking area TFTA to which the terminal belongs;

the auxiliary information at least comprises: the position information of the terminal and the motion state information of the terminal.
The method of claim 1, wherein the motion status information of the terminal comprises at least one of:

the type information of the terminal indicates the motion capability of the terminal;

and the motion record information of the terminal indicates at least one of the current motion situation of the terminal and the historical motion situation of the terminal.
The method of claim 1, wherein the method further comprises:

and responding to the requirement of sending downlink data to the terminal in the non-connection state, and sending a paging message to the non-terrestrial network NTN cell in the TFTA indicated by the indication information.
The method of claim 3, wherein the method further comprises:

and determining one or more NTN cells in the TFTA indicated by the indication information at least according to the time information, the ephemeris information and the cell signal coverage area information.
The method of claim 1, wherein the method further comprises:

and receiving a registration request carrying the auxiliary information.
The method of claim 5, wherein the method further comprises:

and issuing a registration acceptance message carrying the indication information of the TFTA according to the registration request.
A communication method is applied to a terminal, and the method comprises the following steps:

receiving indication information of a TFTA to which a terminal belongs; wherein the TFTA is determined according to auxiliary information of a terminal; the auxiliary information at least comprises: position information of the terminal and motion state information of the terminal;

and updating TAU of the tracking area according to the indication information.
The method of claim 7, wherein the motion status information of the terminal includes at least one of:

the type information of the terminal indicates the motion capability of the terminal;

and the motion record information of the terminal indicates at least one of the current motion situation of the terminal and the historical motion situation of the terminal.
The method of claim 7, wherein the method further comprises:

and reporting the registration request carrying the auxiliary information.
The method of claim 9, wherein the receiving the indication information for the TFTA comprises:

and receiving a registration acceptance message which is issued according to the registration request and carries the indication information of the TFTA.
The method of claim 7, wherein the performing a TAU according to the indication information further comprises:

and performing TAU in response to the terminal being out of the TFTA indicated by the indication information.
The method of claim 11, wherein the method further comprises:

and determining one or more NTN cells in the TFTA indicated by the indication information at least according to the time information, the ephemeris information and the cell signal coverage area information.
The method of claim 12, wherein the method further comprises:

in response to detecting a first Tracking Area Identity (TAI), determining that the terminal is within a TFTA indicated by the indication information; wherein the first TAI is a TAI of any NTN cell in the one or more NTN cells;

or,

in response to detecting the second TAI, determining that the terminal is outside the TFTA indicated by the indication information; wherein the second TAI is different from a TAI of any of the one or more NTN cells.
The method of claim 11, wherein the method further comprises:

determining that the terminal is out of the TFTA indicated by the indication information in response to the fact that the time length of the terminal in the TFTA is greater than or equal to the predicted time length;

wherein the predicted duration is determined according to the auxiliary information of the terminal.
A communication device, applied to a network side, comprises a first sending module, wherein the first sending module is configured to:

according to the auxiliary information of the terminal, issuing the indication information of the TFTA to which the terminal belongs;

the auxiliary information at least comprises: the position information of the terminal and the motion state information of the terminal.
The apparatus of claim 15, wherein the first transmitting module is further configured to: the motion state information of the terminal comprises at least one of the following:

the type information of the terminal indicates the motion capability of the terminal;

and motion record information of the terminal indicating at least one of a current motion situation of the terminal and a historical motion situation of the terminal.
The apparatus of claim 15, wherein the first transmitting module is further configured to:

and responding to the requirement of sending downlink data to the terminal in the non-connection state, and sending a paging message to the non-terrestrial network NTN cell in the TFTA indicated by the indication information.
The apparatus of claim 17, wherein the apparatus further comprises a first determination module, wherein the first determination module is configured to:

and determining one or more NTN cells in the TFTA indicated by the indication information at least according to the time information, the ephemeris information and the cell signal coverage area information.
The apparatus of claim 15, further comprising a first receiving module, wherein the first receiving module is configured to receive a registration request carrying the assistance information.
The apparatus of claim 19, wherein the first transmitting module is further configured to:

and issuing a registration acceptance message carrying the indication information of the TFTA according to the registration request.
A communication device, which is applied to a terminal, comprises a second receiving module and an updating module, wherein,

the second receiving module configured to: receiving indication information of a TFTA to which a terminal belongs; wherein the TFTA is determined according to auxiliary information of a terminal; the auxiliary information at least comprises: position information of the terminal and motion state information of the terminal;

the update module configured to: and performing TAU according to the indication information.
The apparatus of claim 21, wherein the second receiving means is further configured to: the motion state information of the terminal comprises at least one of the following:

the type information of the terminal indicates the motion capability of the terminal;

and motion record information of the terminal indicating at least one of a current motion situation of the terminal and a historical motion situation of the terminal.
The apparatus of claim 21, further comprising a second sending module, wherein the second sending module is configured to report a registration request carrying the assistance information.
The apparatus of claim 23, wherein the second receiving means is further configured to:

and receiving a registration acceptance message which is issued according to the registration request and carries the indication information of the TFTA.
The apparatus of claim 21, wherein the update module is further configured to:

and responding to the terminal being out of the TFTA indicated by the indication information to carry out TAU.
The apparatus of claim 25, wherein the apparatus further comprises a second determination module, wherein the second determination module is further configured to:

and determining one or more NTN cells in the TFTA indicated by the indication information at least according to the time information, the ephemeris information and the cell signal coverage area information.
The apparatus of claim 26, wherein the second determining module is further configured to:

in response to detecting a first Tracking Area Identity (TAI), determining that the terminal is within a TFTA indicated by the indication information; wherein the first TAI is a TAI of any NTN cell in the one or more NTN cells; (ii) a

Or,

in response to detecting the second TAI, determining that the terminal is out of the TFTA indicated by the indication information; wherein the second TAI is different from a TAI of any of the one or more NTN cells.
The apparatus of claim 25, wherein the apparatus further comprises a third determination module, wherein the third determination module is configured to:

determining that the terminal is out of the TFTA indicated by the indication information in response to the fact that the time length of the terminal in the TFTA is greater than or equal to the predicted time length;

wherein the predicted duration is determined according to the auxiliary information of the terminal.
A communication device, comprising:

an antenna;

a memory;

a processor, coupled to the antenna and the memory, respectively, configured to control the transceiving of the antenna by executing computer-executable instructions stored on the memory, and to implement the method provided by any of claims 1 to 6 or claims 7 to 14.
A computer storage medium storing computer-executable instructions capable of implementing the method provided by any one of claims 1 to 6 or 7 to 14 when executed by a processor.