Method and apparatus for wireless communication

Abstract

The present application provides a method and apparatus for wireless communication, capable of helping a terminal device in an NTN cell to reasonably select a target TN cell for cell handover or cell reselection. The method comprises: on the basis of first information, a terminal device determines one or more first TN regions related to the terminal device in an NTN cell, wherein the one or more first TN regions are used by the terminal device to determine a target TN cell for cell handover or cell reselection, and the first information comprises one or more of: frequency information or a frequency list of a TN region corresponding to the NTN cell, geographic region information of the TN region corresponding to the NTN cell, and geographic region information of each cell in the TN region corresponding to the NTN cell.

Description

Method and apparatus for wireless communication Technical Field

[0001] The present application relates to the field of communication technology, and more particularly, to a method and apparatus for wireless communication. Background Art

[0002] In non-terrestrial network (NTN) systems, NTN cells have a large coverage area and may include multiple terrestrial network (TN) cells. Due to the mobility of NTN systems, handover of terminal devices from NTN cells to TN cells or reselection of TN cells helps ensure service continuity. However, how to enable terminal devices to identify the relevant TN cells within the coverage area of ​​the NTN serving cell is a problem that needs to be solved.

[0003] Summary of the Invention

[0004] The present application provides a method and apparatus for wireless communication. The following describes various aspects of the embodiments of the present application.

[0005] In a first aspect, a method for wireless communication is provided, comprising: a terminal device determining one or more first TN areas related to the terminal device in an NTN cell based on first information, the one or more first TN areas being used by the terminal device to determine a target TN cell for cell switching or cell reselection; wherein the first information includes one or more of the following: frequency information or a frequency list of the TN area corresponding to the NTN cell; geographical area information of the TN area corresponding to the NTN cell; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0006] In a second aspect, a method for wireless communication is provided, comprising: a network device sends first information to a terminal device, the first information being used to determine one or more first TN areas related to the terminal device in an NTN cell, the one or more first TN areas being used by the terminal device to determine a target TN cell for cell switching or cell reselection; wherein the first information includes one or more of the following: frequency information or a frequency list of the TN area corresponding to the NTN cell; geographical area information of the TN area corresponding to the NTN cell; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0007] According to a third aspect, a device for wireless communication is provided, wherein the device is a terminal device, and the terminal device includes: a determination unit for determining one or more first TN areas related to the terminal device in the NTN cell based on first information, and the one or more first TN areas are used by the terminal device to determine the target TN cell for cell switching or cell reselection; wherein the first information includes one or more of the following: frequency information or a frequency list of the TN area corresponding to the NTN cell; geographical area information of the TN area corresponding to the NTN cell; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0008] In a fourth aspect, a device for wireless communication is provided, wherein the device is a network device, and the network device includes: a sending unit, configured to send first information to a terminal device, wherein the first information is used to determine one or more first TN areas related to the terminal device in an NTN cell, and the one or more first TN areas are used by the terminal device to determine a target TN cell for cell switching or cell reselection; wherein the first information includes one or more of the following: frequency information or a frequency list of the TN area corresponding to the NTN cell; geographical area information of the TN area corresponding to the NTN cell; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0009] In a fifth aspect, a communication device is provided, comprising a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory to execute the method described in the first aspect or the second aspect.

[0010] In a sixth aspect, a device is provided, comprising a processor for calling a program from a memory to execute the method as described in the first aspect or the second aspect.

[0011] In a seventh aspect, a chip is provided, comprising a processor for calling a program from a memory so that a device equipped with the chip executes the method described in the first aspect or the second aspect.

[0012] In an eighth aspect, a computer-readable storage medium is provided, on which a program is stored, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0013] In a ninth aspect, a computer program product is provided, comprising a program, wherein the program enables a computer to execute the method as described in the first aspect or the second aspect.

[0014] In a tenth aspect, a computer program is provided, which enables a computer to execute the method as described in the first aspect or the second aspect.

[0015] In the embodiment of the present application, a terminal device can determine the TN area associated with the terminal device based on parameter information of some or all TN areas corresponding to the NTN cell. The TN area associated with the terminal device can be used to determine the target TN cell for the terminal device to perform cell switching or cell reselection, which helps the terminal device perform reasonable cell switching or reselection and ensure service continuity. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a wireless communication system used in an embodiment of the present application.

[0017] FIG2 is an NTN system used in an embodiment of the present application.

[0018] FIG3 is another NTN system applied in an embodiment of the present application.

[0019] FIG4 is a flow chart of a method for wireless communication provided in an embodiment of the present application.

[0020] FIG5 is a flow chart of a possible implementation method of an embodiment of the present application.

[0021] FIG6 is a flow chart of another possible implementation method of the embodiment of the present application.

[0022] FIG7 is a flow chart of another possible implementation method of the embodiment of the present application.

[0023] FIG8 is a flow chart of another possible implementation method of the embodiment of the present application.

[0024] FIG9 is a flow chart of another possible implementation method of the embodiment of the present application.

[0025] FIG10 is a schematic structural diagram of a method for wireless communication provided in an embodiment of the present application.

[0026] FIG11 is a schematic structural diagram of another method for wireless communication provided in an embodiment of the present application.

[0027] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. With respect to the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] The embodiments of the present application can be applied to various communication systems. For example, the embodiments of the present application can be applied to global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, advanced long term evolution (LTE-A) system, new radio (NR) system, evolution system of NR system, LTE-based access to unlicensed spectrum (LTE-U) system on unlicensed spectrum, NR-based access to unlicensed spectrum (NR-U) system on unlicensed spectrum, NTN system, universal mobile telecommunication system (UMTS), wireless local area networks (WLAN), wireless fidelity (WiFi), and fifth generation communication (5th-generation, 5G) system. The embodiments of the present application can also be applied to other communication systems, such as future communication systems. The future communication system may be, for example, a sixth-generation (6G) mobile communication system or a satellite communication system.

[0030] Traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, communication systems can not only support traditional cellular communications, but also support one or more other types of communications. For example, a communication system can support one or more of the following communications: device to device (D2D) communication, machine to machine (M2M) communication, machine type communication (MTC), enhanced machine type communication (eMTC), vehicle to vehicle (V2V) communication, and vehicle to everything (V2X) communication, etc. The embodiments of the present application can also be applied to communication systems that support the above-mentioned communication methods.

[0031] The communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0032] The communication system in the embodiments of the present application can be applied to unlicensed spectrum. The unlicensed spectrum can also be considered a shared spectrum. Alternatively, the communication system in the embodiments of the present application can also be applied to licensed spectrum. The licensed spectrum can also be considered a dedicated spectrum.

[0033] The embodiments of the present application can be applied to NTN systems. As examples, the NTN systems may include 4G-based NTN systems, NR-based NTN systems, Internet of Things (IoT)-based NTN systems, and narrowband Internet of Things (NB-IoT)-based NTN systems.

[0034] A communication system may include one or more terminal devices. The terminal devices mentioned in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, subscriber unit, subscriber station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device, etc.

[0035] In some embodiments, the terminal device may be a station (ST) in a WLAN. In some embodiments, the terminal device may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, an in-vehicle device, a wearable device, a terminal device in a next-generation communication system (e.g., a NR system), or a terminal device in a future-evolved public land mobile network (PLMN) network.

[0036] In some embodiments, the terminal device may be a device that provides voice and / or data connectivity to a user. For example, the terminal device may be a handheld device or an in-vehicle device with wireless connection capabilities. As some specific examples, the terminal device may be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc.

[0037] In some embodiments, the terminal device can be deployed on land. For example, the terminal device can be deployed indoors or outdoors. In some embodiments, the terminal device can be deployed on the water, such as on a ship. In some embodiments, the terminal device can be deployed in the air, such as on an airplane, a balloon, or a satellite.

[0038] In addition to the terminal device, the communication system may also include one or more network devices. The network device in the embodiment of the present application may be a device for communicating with the terminal device, and the network device may also be referred to as an access network device or a radio access network device. The network device may be, for example, a base station. The network device in the embodiment of the present application may refer to a radio access network (RAN) node (or device) that connects the terminal device to a wireless network. The base station can broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmission point (transmitting and receiving point, TRP], transmitting point (transmitting point, TP]), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (distributed unit, DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, a modem or a chip used to be set in the aforementioned equipment or device. The base station can also be a mobile switching center and a device that performs the base station function in D2D, V2X, and M2M communications, a network side device in a 6G network, a device that performs the base station function in a future communication system, etc. The base station can support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment.

[0039] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0040] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0041] By way of example and not limitation, in embodiments of the present application, a network device may be mobile, for example, a mobile device. In some embodiments of the present application, the network device may be a satellite or balloon station. In some embodiments of the present application, the network device may also be a base station located on land, water, or the like.

[0042] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0043] For example, Figure 1 is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. As shown in Figure 1, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or also referred to as a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area and may communicate with terminal devices located within the coverage area.

[0044] Figure 1 exemplarily shows a network device and two terminal devices. In some embodiments of the present application, the communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0045] For example, Figure 2 illustrates an architecture diagram of the aforementioned NTN system. NTN system 200 in Figure 2 utilizes satellite 210 as an aerial platform. As shown in Figure 2, the satellite radio access network includes satellite 210, service link 220, feeder link 230, terminal equipment 240, gateway (GW) 250, and network 260, including base stations and a core network.

[0046] Satellite 210 is a spacecraft based on a space platform. Service link 220 refers to the link between satellite 210 and terminal device 240. Feeder link 230 refers to the link between gateway 250 and satellite 210. Earth-based gateway 250 connects satellite 210 to a base station or core network, depending on the architecture selected.

[0047] The NTN architecture shown in Figure 2 is a bent-pipe transponder architecture. In this architecture, a base station is located on Earth behind gateway 250, with satellite 210 acting as a relay. Satellite 210 operates as a relay, forwarding signals from feeder link 230 to service link 220, or vice versa. In other words, satellite 210 does not function as a base station; communications between terminal device 240 and base stations in network 260 must be relayed through satellite 210.

[0048] Figure 3 illustrates another NTN system architecture. As shown in Figure 3, satellite radio access network 300 includes satellite 310, service link 320, feeder link 330, terminal equipment 340, gateway 350, and network 360. Unlike Figure 2, satellite 310 has a base station 312, while network 360 behind gateway 350 consists solely of a core network.

[0049] The NTN architecture shown in Figure 3 is a regenerative transponder architecture. In this architecture, satellite 310 carries base station 312, which can be directly connected to the Earth-based core network via a link. Satellite 310 functions as a base station, and terminal device 340 can communicate directly with satellite 310. Therefore, satellite 310 can be referred to as a network device.

[0050] The communication system of the architecture shown in Figures 2 and 3 may include multiple network devices, and each network device may include other number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0051] In the embodiment of the present application, the communication system shown in Figures 1 to 3 may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but the embodiment of the present application does not limit this.

[0052] It should be understood that in the embodiments of the present application, a device having a communication function in a network / system may be referred to as a communication device. Taking the communication system 100 shown in FIG1 as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function. The network device 110 and the terminal device 120 may be the specific devices described above and will not be described in detail here. The communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in the embodiments of the present application.

[0053] For ease of understanding, some relevant technical knowledge involved in the embodiments of this application is first introduced. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least part of the following contents.

[0054] As communication technologies develop, communication systems (e.g., 5G) will integrate the market potential of satellite and terrestrial network infrastructure. For example, the 5G standard makes NTN, including satellite segments, part of the recognized 3rd Generation Partnership Project (3GPP) 5G connectivity infrastructure.

[0055] NTN refers to a network or network segment that utilizes radio frequency (RF) resources on satellite or unmanned aerial system (UAS) platforms. Taking satellites as an example, communications satellites are categorized by orbital altitude into low Earth orbit (LEO), medium Earth orbit (MEO), geostationary Earth orbit (GEO), and high elliptical orbit (HEO). LEO is an Earth-centered orbit with an altitude of 2,000 kilometers or less, or with at least 11.25 cycles per day and an eccentricity of less than 0.25. Most man-made objects in outer space are located in LEO. LEO satellites orbit the Earth at high speed (mobility) but in predictable or deterministic orbits.

[0056] Satellites at different orbital altitudes have different orbital periods.

[0057] LEO: Typical altitude is 250-1500 km, with an orbital period of 90-120 minutes.

[0058] MEO: Typical altitude is 5,000-25,000 km, and orbital period is 3-15 hours.

[0059] GEO: Altitude is approximately 35,786 kilometers, and the orbital period is 24 hours.

[0060] As shown in Figures 2 and 3, which used satellites as examples, typical NTN system scenarios for accessing terminal devices involve either NTN transparent payloads or NTN regenerative payloads. The bent-pipe transponder architecture shown in Figure 2 corresponds to the NTN transparent payload, while the regenerative transponder architecture shown in Figure 3 corresponds to the NTN regenerative payload.

[0061] In NTN systems, both satellites and drones are highly mobile. The cells projected by satellites can be fixed relative to the ground or move with the satellite. For example, LEO satellites typically project two types of cells: quasi-fixed cells and quasi-moving cells.

[0062] A cell that is stationary relative to the ground can refer to a service cell with a fixed coverage area. For example, different LEO satellites cover the same area on the ground by adjusting the antenna pointing angle; when a LEO satellite cannot cover the area, another LEO satellite takes over. For satellites in geosynchronous orbit (GSO), the cell projected onto the ground by the satellite can be a fixed cell. For satellites in non-geosynchronous orbit (NGSO), the fixed cell can be served by multiple satellites with alternating coverage.

[0063] A mobile cell may refer to a service cell whose coverage area changes. For example, a cell projected by a LEO satellite onto the ground can move with the satellite. Generally, when the LEO satellite's antenna is perpendicular to the ground, the cell projected by the LEO satellite onto the ground is a mobile cell. Whether the LEO satellite is acting as an independent base station or a relay base station, the mobile cell moves with the LEO satellite, and the relative distance between the LEO satellite and the terminal device is constantly changing. After a period of time, the LEO satellite's signal may not be able to cover the terminal device. If the network deployment is relatively complete, the next LEO satellite will come to cover the terminal device. Because the satellite system is spherical, the next LEO satellite may come from all angles.

[0064] Compared to cellular networks used in traditional communication systems (e.g., NR), the coverage area of ​​service cells in NTN systems is typically larger. In some embodiments, in satellite-based NTN systems, the diameter of an NTN cell is at least 50 km. In some embodiments, an NTN cell can cover multiple cities where TN cells are deployed, or it can cover remote areas or ocean regions where no TN cells exist. In some embodiments, the coverage area of ​​an NTN cell may span a country. Therefore, in some scenarios, the actual amount of TN coverage within the coverage area of ​​a complete NTN cell may be very large.

[0065] In the quasi-terrestrial mobile cell scenario, as the aerial platform moves, the NTN cell will cover different geographic areas. Due to these different geographic areas, the TN area covered by the mobile cell will also vary. Therefore, if the NTN cell is updated, its current TN geographic area may also be updated. For example, for a terrestrial mobile cell, the coverage area of ​​the serving cell also moves due to the movement of the satellite. Given the high speed of satellite movement, the TN cell information corresponding to the mobile cell will be updated very frequently.

[0066] The NTN system is mobile, while the TN deployment is relatively static, which means that the validity period of TN coverage data will be very long. Therefore, for terminal devices in the NTN area, switching from an NTN cell to a TN cell or reselecting a TN cell helps to ensure service continuity. In order to facilitate the terminal device to switch to the TN area, when there is a TN coverage area within the NTN coverage area, the network (NW) needs to notify the terminal device of the coverage status of the TN area within the NTN cell where the terminal device is located. In other words, the terminal device needs to know the surrounding TN areas to optimize the terminal device measurements for cell switching or cell reselection. For example, for terminal devices performing vehicle-to-everything (V2X) edge communication in the NTN area, it is necessary to know the surrounding TN coverage areas to perform reasonable cell switching. For example, when an inactive terminal device performs radio resource control (RRC) resumption, it needs to know the surrounding TN coverage areas or base station information to ensure service continuity.

[0067] Furthermore, in certain NTN system scenarios, terminal devices may be in high-speed motion. This means that the terminal device's velocity is not negligible compared to satellite motion. These terminal devices may need to switch between multiple NTN cells and multiple TN cells along their trajectory to ensure service continuity. Therefore, terminal devices need to be proactively aware of TN areas or network equipment along their trajectory to facilitate timely cell switching.

[0068] In order to optimize terminal device measurements on TN neighboring cells for cell handover or cell reselection, how to provide the terminal device with TN cells related to the terminal device within the coverage of the NTN serving cell is a problem that needs to be solved.

[0069] It should be noted that the above-mentioned problem of needing to notify the terminal device of the TN coverage situation due to the large coverage of the NTN system and the mobility of satellites and / or terminal devices is only an example. The embodiments of the present application can be applied to any scenario where the TN coverage situation needs to be notified due to the large cell coverage or the mobility of the communication device.

[0070] Based on this, an embodiment of the present application proposes a method for wireless communication. In this method, a terminal device can accurately determine the TN coverage range (TN area) within an NTN cell through first information corresponding to signaling or a message, thereby determining a target TN cell for cell handover or cell reselection. For ease of understanding, the method proposed in an embodiment of the present application is described in detail below with reference to FIG4 .

[0071] 4 , in step S410 , the terminal device determines one or more first TN areas related to the terminal device in the NTN cell according to the first information.

[0072] The terminal device is any of the terminal devices described above. In some embodiments, the terminal device is a user equipment in a quasi-terrestrial fixed cell or a quasi-terrestrial mobile cell of an NTN system. In some embodiments, the terminal device is a communication device that supports NTN features in both GSO and NGSO scenarios. For example, the terminal device supports mobility in both GSO and NGSO scenarios.

[0073] The terminal device can be a device that performs multiple communications within the NTN coverage area. In some embodiments, the terminal device can be a device that performs both NR edge communication and V2X edge communication. In some embodiments, the terminal device can only perform V2X edge communication.

[0074] The terminal device may be a communication device in different communication states. For example, the terminal device may be a user equipment in an idle state, a communication device in the RRC establishment process, or a terminal device in an inactive state, which is not limited here.

[0075] The terminal device can be in motion or stationary. In some embodiments, the terminal device may be in high-speed motion and, during operation, may be within the coverage areas of multiple TN cells. In some embodiments, the terminal device's operating speed is not negligible relative to the movement of the satellite and, during operation, may be within the coverage areas of multiple NTN mobile cells. In some embodiments, the terminal device is stationary relative to the ground and, during communication, may be within the coverage areas of different NTN mobile cells.

[0076] The first information can be used by the terminal device to determine one or more first TN areas associated with it, thereby optimizing the terminal device's measurements for cell handover or cell reselection. In other words, the terminal device can only measure cells in one or more first TN areas, rather than all surrounding cells, thereby reducing device power consumption. For example, after a terminal device in an NTN cell determines its first TN area, it can perform a handover from the NTN cell to a TN cell.

[0077] In some embodiments, the information about some or all TN areas corresponding to the NTN cell in the first information can facilitate the terminal device to determine the first TN area surrounding it. For example, the terminal device can request RRC recovery from the cells in the relevant first TN area based on the stored TN area information.

[0078] A TN area is used to describe the coverage area of ​​a terrestrial network and may also be referred to as TN coverage or TN deployment. A TN area typically includes multiple TN cells. In some embodiments, a TN cell may be a cell served by network equipment located on the ground. A TN cell is typically static, and cell data is valid for a long period of time. In some embodiments, a TN cell may be a cell served by network equipment over a relatively long period of time.

[0079] The TN cell in the TN area may be any of the cells described above, such as an urban cell, a micro cell, etc., and is not limited here.

[0080] The first TN area is a TN area related to the terminal device. For example, the first TN area may be the TN area surrounding the terminal device at the current moment. In another example, the first TN area may cover an area that the terminal device is about to pass through. In another example, the first TN area may be the area where the target TN cell for the terminal device to perform cell handover or cell reselection is located.

[0081] The first TN area associated with the terminal device may be one TN area or multiple TN areas. For example, in an area where TN areas are densely distributed, there may be multiple TN areas that can establish an RRC connection with the terminal device. These TN areas may overlap.

[0082] The communication device can determine one or more first TN areas associated with the terminal device in a variety of ways. In some embodiments, one or more first TN areas can be determined based on the distance between the terminal device and multiple TN areas corresponding to the NTN cell. An example of a method for determining the first TN area will be described below using a formula. In some embodiments, the network device can determine one or more first TN areas associated with the terminal device based on the geographic area information of the TN area and the movement trajectory of the terminal device. In some embodiments, the terminal device can search based on the frequency point to determine the first TN area associated with it.

[0083] The terminal device may determine a target TN cell for cell switching or cell reselection based on one or more first TN areas. For example, after the terminal device determines one or more first TN areas associated with it, it may perform terminal device measurements for cell switching or cell reselection to determine the target TN cell.

[0084] In some embodiments, a terminal device can establish a connection with a target TN cell to ensure service continuity. For example, switching a terminal device from an NTN cell to a target TN cell can avoid transmission delays caused by the long communication distance of the NTN cell, further improving transmission efficiency. For example, after determining the target TN cell, the terminal device can prioritize the target TN cell during cell reselection to improve transmission quality.

[0085] The target TN cell can be the preferred first cell or multiple relatively preferred cells. In some embodiments, the target TN cell can be the optimal TN cell determined by a terminal device to ensure optimal transmission performance. In some embodiments, the target TN cell can be multiple TN cells so that a suitable TN cell can be selected based on actual conditions during cell switching or cell reselection. For example, when the optimal TN cell determined by the terminal device based on measurement is fully loaded, the terminal device can switch to a suboptimal TN cell.

[0086] The first TN area time domain refers to multiple TN areas corresponding to the NTN cell. The TN areas corresponding to the NTN cell refer to multiple TN areas within the coverage area of ​​the NTN cell. In some embodiments, for an NTN mobile cell, as the geographical area covered by the NTN cell changes, the TN areas within the coverage area also change. In some embodiments, for an NTN fixed cell, the TN areas within the coverage area of ​​the NTN cell are relatively fixed.

[0087] As a possible implementation manner, the TN area corresponding to the NTN cell may include the TN area within the coverage range at the current time, and may also include the TN area within the coverage range before the current time, and may also include the TN area within the coverage range after the current time. For example, when the current time is t, the TN area corresponding to the NTN cell includes the TN area covered at time t, the TN area covered at time tn, and / or the TN area covered at time t+n.

[0088] In some embodiments, the TN areas corresponding to NTN cells may overlap. For example, in densely populated urban areas, the coverage of the TN areas may be the same. In other words, within the coverage area of ​​the NTN cell, the TN areas in some areas may be relatively clustered, resulting in overlapping areas.

[0089] The first information may include specific information about the TN area corresponding to the NTN cell, so that the terminal device can determine the first TN area associated with it. The first information may also be referred to as TN coverage area information, TN coverage information, or TN area information. This information includes one or more of the following: frequency information or a frequency list of the TN area corresponding to the NTN cell; geographic area information of the TN area corresponding to the NTN cell; and geographic area information of each cell within the TN area corresponding to the NTN cell.

[0090] In some embodiments, the first information may include frequency information or a frequency list of the TN area corresponding to the NTN cell. The frequency information or frequency list may facilitate measurements by the terminal device. For example, the first information may indicate the frequency used by the TN area through a frequency list. The frequency list may be a frequency list under each TN coverage area, or a frequency list corresponding to multiple TN areas. For example, when multiple TN areas use the same frequency f1, only one f1 may appear in the frequency list. If the terminal device cannot detect any reference signal based on frequency f1 within a period of time, it indicates that these TN areas do not cover the location of the terminal device. For another example, the terminal device may search for the cell with the strongest signal based on the frequency points in the frequency list.

[0091] In some embodiments, the first information may include geographic area information of the TN area corresponding to the NTN cell. The geographic area information may be used to identify the coverage of the TN area, so that the terminal device can determine whether a certain TN cell is located in the vicinity of the terminal device.

[0092] In some embodiments, the manner of indicating the geographical area information of the TN area may be determined according to the actual geographical conditions within the coverage area of ​​the TN area.

[0093] As a possible implementation, the geographic area information of a TN area can be described using the center point location and cell radius of the TN coverage area. That is, the center location of the TN coverage area and its radius can be represented using the center point location information and radius information, respectively. The terminal device can calculate the boundary of the TN area based on the center point location and radius to determine whether it is within the coverage area of ​​the TN area or is about to enter the coverage area.

[0094] As another possible implementation, the geographic location of a TN region can be described using location information of a boundary line or boundary point. The terminal device can directly determine one or more first TN regions associated with it based on its own location and the location information of the boundary lines or boundary points of multiple TN regions. For example, the geographic location of a TN region can be represented using a latitude and longitude range.

[0095] In some embodiments, the first information may include geographic area information for each cell in the TN area corresponding to the NTN cell. As previously mentioned, a TN area typically includes multiple TN cells. The first information may indicate the geographic area information for each TN cell in each TN area using a TN cell positioning method. For example, the first information may indicate the geographic area information for each cell using location information of a network device in the TN area.

[0096] In some embodiments, the first information may include a list of multiple TN areas corresponding to the NTN cell. For example, the first information may include a list of TN areas indicated by the geographic area information. For example, the first information may include a list of TN areas indicated by the frequency information.

[0097] In some embodiments, the first information may further include specific information of all TN areas within the NTN cell, so that the terminal device can determine all first TN areas related thereto.

[0098] It should be noted that the TN area corresponding to the NTN cell in the first information may be part of the TN area corresponding to the NTN cell, or may be all of the TN areas corresponding to the NTN cell. In some embodiments, when information about one or more first TN areas related to the terminal device can be determined by information about a group of TN areas, the first information may only include information about that group of TN areas. In other words, if the terminal device can determine the relevant TN areas, the first information does not need to include information about all of the TN areas corresponding to the NTN cell.

[0099] The terminal device may obtain the first information in a variety of ways. In some embodiments, the first information may be sent by a network device to the terminal device. For example, the network device may send the first information when the terminal device requests to establish an RRC connection. In some embodiments, the first information may be determined by a combination of transmission by the network device and autonomous measurement by the terminal device. For example, the terminal device may receive the second information via broadcast and then determine the third information through autonomous measurement. In some embodiments, the terminal device may determine the first information solely through autonomous measurement.

[0100] Exemplarily, the network device may send the first information to the terminal device via broadcast or dedicated signaling. As an embodiment, the terminal device may receive part of the first information (e.g., the second information) via broadcast, and then receive another part of the information (e.g., the third information) via dedicated signaling. As an embodiment, as an embodiment, the terminal device may receive the second information via broadcast, and then determine the third information by combining dedicated signaling and autonomous measurement. As an embodiment, the terminal device may receive the first information only via dedicated signaling.

[0101] The network device may be a communication device providing services on the NTN network side. In some embodiments, the network device may be a base station in the NTN system providing services via satellite. For example, the network device may be a satellite. In some embodiments, the network device may be a non-satellite mobile network device. For example, the network device may be a base station installed on a low-altitude aircraft.

[0102] A network device can provide services to a terminal device in various scenarios. In some embodiments, the network device can currently provide services to the terminal device. The terminal device can obtain the first information through communication with the network device. In some embodiments, the network device can be a communications device that has previously provided services to the terminal device. The terminal device stores the first information sent by the network device to facilitate subsequent determination of a target TN cell. In some embodiments, the network device can be a base station with which the terminal device is establishing an RRC connection.

[0103] The network device may be a communication device that moves relative to the terminal device. Due to the movement of the network device and / or the terminal device, the terminal device may need to perform cell handover or cell reselection. In some embodiments, the network device for a mobile cell is deployed on a satellite. Regardless of whether the terminal device is stationary or its speed is negligible, the satellite and the terminal device are in relative motion. In some embodiments, if the terminal device's mobility is high or, for V2X-based services, the terminal device's mobility is not negligible, the cell information surrounding the terminal device will be frequently updated.

[0104] The network device can determine the first information in a variety of ways. In some embodiments, because the satellite's trajectory is predictable, the TN areas within the NTN mobile cell are also predictable. The network device can determine the first information based on the predicted trajectory. In some embodiments, when the network device is deployed on a satellite, it can determine the distribution of terrestrial TN areas through communication with a terrestrial core network, thereby determining the first information.

[0105] The network device can send the first information to the terminal device in various ways. In some embodiments, the NTN mobile cell can broadcast the first information based on the predicted trajectory. In some embodiments, the NTN mobile cell can combine broadcasting with dedicated signaling to send the first information to more accurately inform the terminal device of the coverage range of the TN area. In some embodiments, the NTN mobile cell can send the first information via dedicated signaling based on the location information of the terminal device.

[0106] When the first information is sent via a broadcast message, an existing system information block (SIB) can be used, or a new SIB can be established to carry this information. For example, the network device can use the signaling structure in the existing SIB4 to carry the first information. SIB4 can include a frequency list and a TN coverage area list. To minimize overhead, the network device can define the TN coverage area in a separate information element (IE).

[0107] As an embodiment, the network device may send the first information only via a broadcast message. The first information may be determined based on the current coverage area. For example, the network device broadcasts the TN area corresponding to each time at different times. For example, at time T1, the NTN mobile cell covers TN area 1 and TN area 2 and broadcasts TN area 1 and TN area 2; at time T2, the NTN mobile cell covers TN area 2 and TN area 3 and broadcasts TN area 2 and TN area 3; at time T3, the NTN mobile cell covers TN area 3 and broadcasts TN area 3.

[0108] During the implementation of the above embodiment, during the time period from T1 to T3, due to changes in the TN area within the coverage area, the NTN cell needs to trigger two system information (SI) modification processes. For example, when the network device sends the TN area at different times via the SIB in the broadcast message, the terminal device needs to frequently update the system information to determine the TN area actually covered by the NTN cell.

[0109] As an embodiment, the network device may send the first information only through a broadcast message. The first information may also include a predicted TN area. Exemplarily, the network device may predict and determine the specific information of the TN cell through information such as the motion trajectory and the motion direction, and generate the first information. The first information in the broadcast message includes not only the TN area covered by the NTN cell at the current moment, but also the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment. Therefore, the network device will broadcast more TN areas than the TN areas in the current coverage of the NTN cell, and the terminal device does not need to frequently update the SI information.

[0110] For example, the NTN mobile cell covers n TN areas, namely TN area 1, TN area 2, ..., and TN area n. Based on the mobile speed of the NTN, assuming that the low mobile speed of the terminal device can be ignored, the first information in the broadcast message can contain different content. Optionally, at time t, for terminal devices within the coverage area, the areas previously covered and the areas currently being covered are broadcast. Optionally, at time t, for terminal devices within the coverage area, the areas currently being covered and the areas to be covered based on the predicted results are broadcast.

[0111] Still taking the three moments mentioned above as an example, at moment T1, the NTN mobile cell covers TN area 1 and TN area 2, and broadcasts TN area 1, TN area 2 and TN area 3 (areas to be covered); at moment T2, the NTN mobile cell covers TN area 2 and TN area 3, and broadcasts TN area 1 (area previously covered), TN area 2 and TN area 3; at moment T3, the NTN mobile cell covers TN area 3, and broadcasts TN area 1 (area previously covered), TN area 2 (area previously covered) and TN area 3.

[0112] It can be seen from the implementation process of the above embodiment that during the time period from T1 to T3, the content of the broadcasted first information does not change, and does not need to be triggered for modification, and the terminal device does not need to frequently update system information.

[0113] As an embodiment, the network device may send the first information by combining broadcast messages with dedicated signaling to reduce the problem of excessive signaling overhead in the two previous embodiments. As can be seen from the foregoing, the actual number of TN areas within the coverage area of ​​a complete NTN cell may be very large. If only broadcast signaling is used to provide data for the TN area, the signaling overhead will be very large. For example, the signaling overhead of the frequency information involved in the coverage information list of each TN coverage area will be relatively large. Furthermore, the more accurate the TN area data provided to the terminal device, the greater the success rate of the terminal device in performing NTN-TN cell switching or cell reselection. Therefore, in order to improve the accuracy of the data, the amount of information in the first information may be very large, resulting in a sharp increase in the overhead of broadcast signaling.

[0114] Since the validity period of TN area data is very long, the network does not need to frequently update the relevant data of the TN area. Therefore, in this embodiment, when broadcast messages and terminal device dedicated signaling are used in combination, the dedicated signaling can bear more overhead, thereby reducing the overhead of broadcast signaling.

[0115] As an implementation method, the terminal device dedicated signaling can be dedicated RRC signaling, dedicated non-access stratum (NAS) signaling, or other dedicated signaling, which is not limited here.

[0116] When broadcast messages and dedicated signaling are used in combination, the content of the first information can be represented by multiple messages, so that the terminal device can readily determine the information of nearby TN areas or ground network equipment (for example, base stations) while reducing the broadcast signaling overhead.

[0117] In some embodiments, the first information may include second information and third information. The second information may be related to the TN area corresponding to the NTN cell, and the third information may be related to one or more first TN areas used to determine the target TN cell. In other words, the second information may include brief information, or general information, about some or all of the TN areas corresponding to the NTN cell. The third information may include specific information about the first TN areas related to the terminal device. For example, the network device may send the center coordinates and radius of multiple first TN areas based on the terminal device.

[0118] As a possible implementation, the second information may include frequency information / frequency list for the NTN cell coverage TN area. The second information may also include geographic area information for a list of (possibly overlapping) cells within the NTN cell coverage area. The second information may also include a frequency list for each TN coverage area. Each TN coverage area is intended to describe a group of cells, not just a single cell. For example, each TN coverage area may be defined using center location coordinates and a radius.

[0119] As a possible implementation, the third information can also be determined based on the actual TN areas and terminal device conditions within the NTN cell. For example, if there are many TN areas and the terminal device's mobility is not negligible, the third information can also include information about the relative motion of the satellite and the terminal device. This allows the terminal device to combine these two pieces of information to more accurately predict the nearby first TN area or terrestrial network device information. For another example, the first TN area can be predicted by considering both the terminal device and satellite's mobility.

[0120] As a possible implementation manner, the third information may further include fourth information or fifth information, which are respectively sent through different dedicated signaling.

[0121] As a possible implementation, the content of the second information and the third information may be adjusted based on the transmission mode. For example, the second information may include a frequency list of TN areas within an NTN cell, and the third information may include specific frequency information involved in the coverage information list of each TN coverage area.

[0122] In the case that the first information includes the second information and the third information, the network device may send the two information through a broadcast message and dedicated signaling, respectively.

[0123] Exemplarily, the second information may be carried in a broadcast message. For example, frequency information / frequency lists for the TN areas covered by NTN cells may be broadcast via broadcast signaling. In another example, the network may provide corresponding geographic area information via broadcast signaling of (possibly overlapping) area lists. In another example, a frequency list describing each TN coverage area of ​​a group of cells may be broadcast via broadcast signaling.

[0124] Exemplarily, the third information may be carried in dedicated signaling. For example, RRC signaling may be used to send the center coordinates and radius of a single cell corresponding to each frequency, so that the terminal device can define the center coordinates and radius information of each cell in each area.

[0125] As a possible implementation, when the third information is carried in dedicated signaling, the network device may send the third information at different times according to different states of the terminal device.

[0126] Exemplarily, the third information may be determined by the terminal device according to a measurement result, which will be described below in conjunction with the measurement.

[0127] Exemplarily, the third information may also be determined in combination with dedicated signaling and measurement results of the terminal device. For example, the network device may send information about multiple predicted TN areas that may be relevant to the terminal device to the terminal device via dedicated signaling. The terminal device may refine these TN areas through measurement and other means, and ultimately determine third information including one or more first TN areas. Furthermore, the terminal device may determine a target TN cell for cell switching based on the first TN area in the third information.

[0128] In some embodiments, the first information may include the second information and / or the third information, the second information is carried in the broadcast message, and the third information is carried in the dedicated signaling and / or is determined by the terminal device based on the measurement results. Optionally, the first information may only include the second information, the first information is the second information, and is carried in the broadcast message. Optionally, the first information may only include the third information, the first information is the third information, and is carried in the dedicated signaling. Optionally, the first information may only include the third information, the first information is the third information, and is determined by the terminal device based on the measurement results. Optionally, the first information may only include the third information, the first information is the third information, and is determined by the terminal device based on the measurement results.

[0129] As can be seen from Figure 4, the method of the embodiment of the present application can provide corresponding geographical area information through the network via broadcast signaling of a (possibly overlapping) area list, and further provide specific information about the TN area by adding useful additional information to the dedicated signaling. Through this method, when the cell coverage area is large and the network equipment and terminal equipment are in relative motion, the measurement of the terminal device for cell switching or cell reselection is optimized. Furthermore, the problem of how the NTN network notifies the terminal device of the coverage status of the TN area within the NTN area and whether the terminal device can be accurately notified is solved, so as to ensure that the terminal device knows the TN coverage area or base station information, thereby ensuring service continuity.

[0130] As mentioned earlier, in some scenarios, the mobility of a terminal device cannot be ignored. For example, when the terminal device is moving at high speed, performing V2X services, or performing NR edge communications. In these scenarios, predicting the TN area associated with the terminal device requires considering both the NTN's mobility speed and the terminal device's mobility speed.

[0131] In some embodiments, the communication device can predict the first TN area near the terminal device based on the movement trajectory of the terminal device, so that the NTN network can more specifically notify the terminal device of the specific information covered by the first TN area through RRC or NAS dedicated signaling.

[0132] For example, the network device can determine the location of the terminal device at a specific moment based on the prediction and the terminal device's navigation trajectory, so that the network device can transmit relevant TN area information. For example, the terminal device's navigation trajectory can be determined based on a global navigation satellite system (GNSS) or other navigation route. In another example, the terminal device can report its own navigation trajectory to the NTN network. In another example, the NTN network can independently locate and predict the movement route of the terminal device.

[0133] When the mobility rate of the terminal device cannot be ignored, the distance between the terminal device and the TN area changes as the terminal device moves. In some embodiments, one or more first TN areas associated with the terminal device can be determined based on the distances between the terminal device and multiple TN areas corresponding to the NTN cell.

[0134] For example, the coordinates of the center positions of multiple TN areas can be used to predict the coverage area of ​​the surrounding TN or the information of specific base stations in the TN area when the terminal device is at a certain location. For example, when the NTN cell corresponds to M TN areas (M is a natural number greater than 1), if the location of the terminal device at a certain moment is represented by P u (x u ,y u ), the coordinates of the center position of the jth TN area among the M TN areas are expressed as (x j ,y j ), then the distance Z between the terminal device and the center of the jth TN area j It can be expressed as:

[0135] For example, among the multiple TN areas corresponding to the NTN cell, the first TN area can be determined based on the distance threshold. For example, the first TN area can be determined based on the first distance threshold. The first distance threshold can be the distance threshold value Z of the first TN area set by the NTN network. target For another example, the first TN area may be determined according to the first distance threshold and a coefficient related to the first distance threshold.

[0136] For example, the coefficients of the first distance threshold may include a first coefficient α and a second coefficient β, and the distance Z between the terminal device and the N TN areas is j The following conditions are met: α×Z target ≤Z j ≤β×Z target .

[0137] Exemplarily, α and β may be different percentages, such as 100%, 80%, 70%, 60%, etc.

[0138] For example, the system can configure the two coefficients of the first distance threshold. For example, it can be configured according to the density of the TN area coverage. The greater the density of the TN area coverage, the greater the Z j The selected interval will be smaller.

[0139] As an implementation method, the NTN network can notify the terminal device of the area Z of the TN cell through RRC signaling. j .

[0140] In some embodiments, the communication device can predict the timing of a terminal device's cell handover or cell reselection based on the terminal device's trajectory and the deflection angle or angle between the terminal device and the satellite, allowing the terminal device to switch to the ground station at the appropriate time. For example, the terminal device's trajectory and the angle between the terminal device and the satellite's trajectory can facilitate the terminal device's determination of the timing of reaching the edge of an NTN cell.

[0141] Exemplarily, a terminal device may perform measurements for cell switching or reselection at a cell boundary. The boundary used by the terminal device to determine the timing of switching or reselection is referred to as a first boundary. Within the coverage area of ​​an NTN cell, the first boundary at which the terminal device performs cell switching or cell reselection may be the edge of the NTN cell, or the boundary between the NTN cell and the TN area corresponding to the NTN cell. For example, the terminal device may perform NTN-TN cell switching at the boundary between the NTN cell and the first TN area.

[0142] Exemplarily, when the mobility rate of the terminal device cannot be ignored, the timing of cell switching or cell reselection of the terminal device can be determined according to operating parameters of the terminal device and / or operating parameters of satellites in the NTN system.

[0143] For example, the operating parameters of the terminal device or satellite may include movement speed and motion trajectory. The motion trajectory may refer to the direction of movement of the device. The motion trajectory of the terminal device and the satellite may determine the angle between the motion trajectories of the two devices.

[0144] Regarding these operating parameters, the movement speed can be used to determine the distance between the terminal device and the first boundary; the movement trajectory can also be used to determine the distance between the terminal device and the first boundary. For example, the movement speed and angle between the terminal device and the satellite can be used by the communication device to predict the distance between the terminal device and the first boundary to determine the handover timing.

[0145] For example, assuming the moving speed of the terminal device is V u , the satellite's moving speed is V t , V u With V t The angle between At the current moment, the distance between the terminal device and the first boundary closest to it in the direction of its motion trajectory is D1. At the current moment, the distance between the terminal device and the first boundary closest to it in the direction perpendicular to its motion trajectory is D2. Based on these assumptions, consider that the NTN satellite and the terminal device move along their respective motion trajectories, and the time they take to run in the directions D1 and D2 are t1 and t2, respectively. t1 and t2 can be expressed as follows:

[0146] in, Not 0.

[0147] It is further assumed that, starting from the current moment, the terminal device initiates cell handover or cell reselection to the ground station after a period of time T. In other words, the timing of the terminal device performing cell handover or cell reselection is represented by a first period of time T starting from the current moment. The first period of time T can be expressed as:

[0148] T = min(t1, t2) - t;

[0149] Wherein, t represents the time for the terminal device to perform cell handover or cell reselection. For example, t can be determined based on the length of the T300 timer used by the terminal device to make a connection request, such as 600ms. t can also be an average reference value set by the NTN network based on experience.

[0150] In some embodiments, the target TN cell and the timing of the handover can be determined based on the operating parameters of the terminal device and the satellite. For example, the position P of the terminal device after the T time period can be determined based on the operating parameters. u , then based on the multiple distances Z between the location and the multiple first TN cells i Determine the target TN cell.

[0151] As mentioned above, the third information can be carried in dedicated signaling or determined based on the terminal device's measurement results. When the third information is carried in dedicated signaling, the network device can determine the timing of sending the third information based on the terminal device's status. The terminal device can store the third information to facilitate subsequent cell reselection or cell handover.

[0152] It should be noted that the first information can also be carried in dedicated signaling. Therefore, the information in the dedicated signaling can include specific coverage information for all TN areas, or it can include specific information for only the first TN area. To distinguish, in the following embodiments, TN area information will be used to represent the third information or the first information described above.

[0153] As a possible implementation method, for a quasi-terrestrial mobile cell, if the coverage of the NTN is updated, the RRC dedicated signaling may be different depending on the status of the terminal device.

[0154] For example, since the RRC connection process includes RRC connection establishment (setup), reconfiguration (reconfiguration), release, and reestablishment processes between the terminal device and the network device (e.g., gNodeB), the third information can be carried in one of the following dedicated signalings according to different states: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; capability query signaling received by the terminal device; and RRC recovery signaling received by the terminal device.

[0155] It should be noted that when the first information is carried in dedicated signaling, the signaling carrying the first information may also refer to the dedicated signaling corresponding to the third information, which will not be repeated here.

[0156] Exemplarily, the terminal device may be in the RRC establishment process, in the RRC idle state, or in an inactive state. For ease of understanding, the dedicated signaling in different states is exemplarily described below in conjunction with Figures 5 to 9. Among them, in the three embodiments of Figures 5 to 7, the terminal device receives TN area information (third information or first information) through dedicated signaling during the RRC establishment process or in the RRC idle state; in the two embodiments of Figures 8 and 9, the terminal device receives TN cell information through dedicated signaling in an inactive state.

[0157] During the RRC establishment process, the network device can notify the terminal device of relevant information, and the terminal device will store this information.

[0158] As an example, during RRC setup signaling, the NTN network sends information about the covered TN area to the terminal device, and the terminal device stores coverage information of surrounding TN cells from the network, as shown in Figure 5. This information may involve the center coordinates and radius of a single cell corresponding to each frequency, so as to define the center coordinates and radius information of each cell in each area.

[0159] Referring to Figure 5, in step S510, the terminal device sends an RRC Setup Request message to the network device. In the initial random access (RA), Message 3 (Msg3) transmits the RRC Setup Request message. The RRC Setup Request message carries the RRC setup reason and the terminal device identifier. The network device establishes a context for the terminal device and grants access to and allocates resources for the signaling radio bearer 1 (SRB1).

[0160] In step S520, the network device replies to the terminal device with an RRC Setup response message. This message may also be referred to as RRC setup signaling. This message carries detailed information about the SRB1 resource configuration and TN area information.

[0161] In step S530, the terminal device configures the wireless resources according to the SRB1 resource information indicated by the RRCSetup message, and then sends an RRC Setup Complete message to the network device. The RRC Setup Complete message carries the selected public land mobile network (PLMN) identifier (selectedPLMN-Identity), registered AMF (registeredAMF), single network slice selection assistance information (SNSSAI) list (snssai-list), etc., and the RRC connection is established. After the network device transparently transmits the NAS direct transmission message between the terminal device and the AMF, the identity query, authentication, NAS security mode and registration process are completed.

[0162] In step S540, the terminal device stores the information of the TN cell. There is no order restriction for steps S530 and S540.

[0163] As an example, in the RRC connect reconfiguration signaling, the NTN network device sends information about the covered TN area to the terminal device, and the terminal device stores the coverage information of the surrounding TN areas from the network, as shown in Figure 5. This information may involve the center position coordinates and radius of a single cell corresponding to each frequency, so as to define the center position coordinates and radius information of each cell in each area.

[0164] Referring to Figure 6, in step S610, the network device sends an RRC connection reconfiguration (RRCReconfiguration) message to the terminal device, instructing it to establish SRB2 and a data radio bearer (DRB), and carries TN area information in the message. This message can also be called RRC connection reconfiguration signaling.

[0165] In step S620, after receiving the RRCReconfiguration message, the terminal device starts to establish SRB2 and DRB. After SRB2 and DRB are successfully established, the terminal device will reply to the network device with an RRC connection reconfiguration complete (RRCReconfigurationComplete) message indicating that the reconfiguration is complete.

[0166] In step S630, the terminal device stores the TN region information. There is no order restriction for step S630 and step S620.

[0167] As an example, the capability query information of the terminal device may include information about the TN area covered by the NTN network device to the terminal device, and the terminal device will store the coverage information of the surrounding TN areas from the network, as shown in Figure 5. This information may involve the center position coordinates and radius of a single cell corresponding to each frequency, so as to define the center position coordinates and radius information of each cell in each area.

[0168] Referring to Figure 7, in step 710, a capability query of the terminal device is performed between the terminal device and the network device. In this process, the network device sends a capability query (UECapabilityEnquiry) message to the terminal device. The message initiating the capability query can carry TN cell information. This message can also be called capability query signaling. The terminal device will reply UECapabilityInformation to the network device and carry the capability information of the terminal device. The network device sends a terminal device radio capability information indication (UE RADIO CAPABILITY INFO INDICATION) message to the AMF and transparently transmits the capabilities of the terminal device.

[0169] In step S720, the terminal device stores the information of the TN cell. There is no order restriction for step S720 and the process of the terminal device replying the capability information.

[0170] When the RRC of a terminal device is in an inactive state, when the terminal device recovers from the RRC_INACTIVE state, the inactive-radio network temporary identifier (I-RNTI) can be determined based on the last NTN network served. If the NTN network identifier can be parsed from the I-RNTI, the context data provided by the last serving NTN network can be directly requested to complete the RRC connection recovery process.

[0171] As an embodiment, when the NTN network sends RRC resume signaling to the terminal device, it can carry TN area information, and the terminal device will store the TN area information, as shown in Figure 8.

[0172] Referring to FIG8 , the terminal device is in an RRC inactive state.

[0173] In step S810, the terminal device sends an RRC resumption request (RRCResumeRequest) to the network device.

[0174] In step S820, the network device replies to the terminal device with an RRC resume (RRCResume), which carries TN area information. This message can also be called RRC resume signaling.

[0175] In step S830, the terminal device stores the information of the TN area.

[0176] In step S840, the terminal device sends an RRC recovery complete (RRCResumeComplete) message to the network device.

[0177] As an embodiment, after the RRC connection is established, the TN area information can be carried in the subsequent RRC connection reconfiguration message (RRC connection reconfiguration signaling), and the terminal device will store the TN area information, see Figure 9 for details.

[0178] Referring to FIG9 , the terminal device is in an RRC connected state.

[0179] In step S910, the network device sends an RRC connection reconfiguration signaling to the terminal device, and carries TN area information.

[0180] In step S920, the terminal device stores the information of the TN area.

[0181] The above description, in conjunction with Figures 5 to 9, describes various implementations of a network device sending TN cell information (third information or first information) to a terminal device. As mentioned above, the third information can also be determined by the terminal device based on measurement results. In other words, the terminal device can determine the first TN area and the target TN cell through autonomous measurement. The following description provides an exemplary explanation of the measurement process of the terminal device.

[0182] In some embodiments, the measurement of TN frequencies can be optimized based on whether the terminal device is within the coverage of a TN area. For example, in addition to receiving TN coverage data provided by the NTN network device as shown in Figures 5 to 9, the terminal device can also detect whether a TN area exists and further refine the first TN area and its covered area to prepare for subsequent cell handover or cell reselection. For example, when the NTN network device provides the terminal device with multiple TN coverage areas, the terminal device can also further clarify the first TN area to be measured through autonomous auxiliary measurement.

[0183] As an implementation method, the terminal device scans all carrier frequencies of its supported standards, searching for a suitable cell (the target TN cell). On each carrier frequency, the terminal device only searches for the cell with the strongest signal and resides in the first target TN cell found. When the terminal device is in high-speed motion, whether the NTN provides the TN area through broadcast, RRC-specific signaling, or a combination of the two, there will be significant deviations in the provided TN area. In this scenario, it is even more important for the terminal device to independently determine the TN area.

[0184] For example, the terminal device may not be able to detect any reference signal from the TN frequency for a period of time. In fact, there is probably no TN area at the location of the terminal device. In this case, the terminal device can relax or stop measuring on the TN frequency.

[0185] For another example, if the network does not provide TN area data or the provided TN area data is too vague, the terminal device can independently detect on the TN area information. When the terminal device detects that there is no TN area around, the terminal device does not need to perform TN adjacent cell measurement. When the TN area range is nearby, the terminal device can consider measuring TN adjacent cells based on the quality of the serving cell. In order to determine whether the TN area is nearby, the terminal device needs to compare its distance to a TN reference position with a specific distance threshold. Since the TN area can be signaled by the area center position coordinates and radius, these two parameters can be used as a reference position and distance threshold to determine the distance from the terminal device to the TN area.

[0186] For another example, a terminal device can prioritize different frequencies based on its communication status. For example, if a terminal device is performing both NR edge and V2X edge communications, the frequency providing both can be considered the highest priority. Alternatively, if a terminal device is configured to perform only V2X edge communications, the frequency providing V2X communications can be considered the highest priority.

[0187] For example, in a V2X or high-speed motion scenario, a terminal device can further determine the specific coverage information of base stations in the same or different TN areas based on multiple TN areas notified by the NTN, preparing for NTN-TN handover. In other words, the target TN cell can be determined based on the terminal device's measurement results of at least one first TN area.

[0188] As an implementation, when the third information is determined by the terminal device based on the measurement result, the measurement result may include the transmit power of the network device corresponding to one or more first TN areas measured by the terminal device. Each of the one or more first TN areas may correspond to multiple network devices. Set P i For a ground station S in a TN area i The transmission power of the terminal device in P u The transmission powers of multiple ground stations measured at the location are P1, ...P n .

[0189] Exemplarily, the target TN cell is also determined based on the relative distances between the multiple network devices corresponding to the one or more first TN areas and the terminal device, and / or the load conditions of the multiple network devices corresponding to the one or more first TN areas.

[0190] For example, when each of the one or more first TN areas corresponds to N network devices, the target TN cell may be determined based on the first parameter of the N network devices corresponding to each of the one or more first TN areas. In each first TN area, the first parameter may comprehensively consider the transmit power measured by the terminal device, the distance between the terminal device and the network device, and the load of the network device.

[0191] For example, the first parameter Q of the i-th network device among the N network devices is pu,i It can be expressed as:

[0192] Among them, P i Indicates the transmit power of the i-th network device, i is a natural number from 0 to N-1, Z i Represents the distance between the terminal device and the center point of the i-th network device, Ri Indicates the distance from the center point of the i-th network device to the edge of the service area, L i Indicates the load saturation of the i-th network device, L i The value range is [0,1].

[0193] It should be noted that P in the above formula i It can also be expressed as the transmission power of the i-th ground station among the N ground stations in the TN area; R i Also denoted as ground station S i The distance from the center point to the edge of the ground station; L i A value of 0 indicates no load, and a value of 1 indicates full load.

[0194] The first parameter can be used to select a suitable target TN cell for the terminal device and can also be used to determine the network device that the terminal device enters the TN area. For example, the base station providing services for the terminal device can be determined, thereby determining the target TN cell for the terminal device to perform cell handover or cell reselection.

[0195] For example, the network device corresponding to the target TN cell for cell handover or cell reselection by the terminal device may be the network device with the largest first parameter among the multiple network devices. Therefore, the first parameter Q of the network device corresponding to the target TN cell is pu The following conditions are met: Q pu =max{Q pu,i}i=0,1,…,N-1.

[0196] Exemplarily, the target TN cell for cell handover or cell reselection by the terminal device may be multiple TN cells, and thus the network devices corresponding to the target TN cells may also be several network devices with larger first parameters, so as to facilitate selection of the most appropriate target TN cell and corresponding network devices according to actual conditions. For example, multiple network devices may be sorted in sequence according to the first parameter, and the network devices corresponding to the top five first parameters may be a list of network devices near the TN area of ​​the terminal device.

[0197] The method embodiment of the present application is described in detail above with reference to Figures 1 to 9 . The device embodiment of the present application is described in detail below with reference to Figures 10 to 12 . It should be understood that the description of the device embodiment corresponds to the description of the method embodiment. Therefore, for portions not described in detail, reference can be made to the above method embodiment.

[0198] FIG10 is a schematic block diagram of an apparatus for wireless communication according to an embodiment of the present application. The apparatus 1000 may be any terminal device described above. The terminal device 1000 shown in FIG10 includes a receiving unit 1010.

[0199] The determination unit 1010 can be used to determine one or more first TN areas related to the terminal device in the NTN cell based on the first information, and the one or more first TN areas are used by the terminal device to determine the target TN cell for cell switching or cell reselection; wherein the first information includes one or more of the following: frequency information or frequency list of the TN area corresponding to the NTN cell; geographical area information of the TN area corresponding to the NTN cell; geographical area information of each cell in the TN area corresponding to the NTN cell.

[0200] Optionally, the first information includes the second information and / or the third information, the second information is carried in the broadcast message, the third information is carried in the dedicated signaling, and / or the third information is determined by the terminal device based on the measurement result.

[0201] Optionally, the first information includes second information and third information, the second information is related to the TN area corresponding to the NTN cell, and the third information is related to the first TN area.

[0202] Optionally, when the third information is carried in dedicated signaling, the dedicated signaling includes RRC signaling or NAS signaling.

[0203] Optionally, the third information is carried in one of the following dedicated signalings: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; capability query signaling received by the terminal device; RRC recovery signaling received by the terminal device.

[0204] Optionally, when the third information is determined by the terminal device based on a measurement result, the measurement result includes the transmission power of the network devices corresponding to one or more first TN areas measured by the terminal device.

[0205] Optionally, the target TN cell is also determined based on the relative distances between the multiple network devices corresponding to one or more first TN areas and the terminal device, and / or the load conditions of the multiple network devices corresponding to one or more first TN areas.

[0206] Optionally, each of the one or more first TN areas corresponds to N network devices, where N is a natural number greater than 1, and the target TN cell is determined according to the first parameters of the N network devices corresponding to each first TN area, and the first parameter Q of the i-th network device among the N network devices is pu,i Expressed as:

[0207] Among them, P i Indicates the transmit power of the i-th network device, i is a natural number from 0 to N-1, Z i Represents the distance between the terminal device and the center point of the i-th network device, R iIndicates the distance from the center point of the i-th network device to the edge of the service area, L i Indicates the load saturation of the i-th network device, L i The value range is [0,1].

[0208] Optionally, the TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current moment, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment.

[0209] Optionally, the one or more first TN areas are determined according to the distance between the terminal device and multiple TN areas corresponding to the NTN cell.

[0210] Optionally, the one or more first TN areas are further determined according to a first distance threshold and / or a coefficient related to the first distance threshold.

[0211] Optionally, the coefficient of the first distance threshold includes a first coefficient α and a second coefficient β, the NTN cell corresponds to M TN areas, and the distance Z between the terminal device and the jth TN area in the M TN areas is j The jth TN region is the first TN region when the following conditions are met: α×Z target ≤Z j ≤β×Z target ;

[0212] Among them, Z target Represents the first distance threshold, j is a natural number from 0 to M-1.

[0213] Optionally, the timing for the terminal device to perform cell switching or cell reselection is determined according to operating parameters of the terminal device and / or a satellite in the NTN system.

[0214] Optionally, the operating parameters include moving speed and motion trajectory, and the motion trajectory of the terminal device and / or satellite is used to determine the distance between the terminal device and the first boundary, and the first boundary includes one of the following boundaries: the edge of the NTN cell; the boundary between the NTN cell and the TN area corresponding to the NTN cell, and the geographical area information of the TN area is represented by the center position and radius of the TN area.

[0215] Optionally, the timing for the terminal device to perform cell handover or cell reselection is represented by a first time period T starting from the current moment, and the first time period T is expressed as: T=min(t1, t2)-t;

[0216] Wherein, t represents the time for the terminal device to perform cell switching or cell reselection;

[0217] D1 represents the distance between the terminal device and the first boundary closest to the direction of the terminal device's motion trajectory, V u Indicates the moving speed of the terminal device, V t represents the moving speed of the satellite, Indicates V u With V t The angle between

[0218] D2 represents the distance between the terminal device and the first boundary closest to the terminal device in the vertical direction along the motion trajectory of the terminal device. Not 0.

[0219] FIG11 is a schematic block diagram of another apparatus for wireless communication according to an embodiment of the present application. The apparatus 1100 may be any of the network devices described above. The apparatus 1100 shown in FIG11 includes a sending unit 1110.

[0220] The sending unit 1110 can be used to send first information to the terminal device, where the first information is used to determine one or more first TN areas related to the terminal device in the NTN cell, and the one or more first TN areas are used by the terminal device to determine the target TN cell for cell switching or cell reselection; wherein the first information includes one or more of the following: frequency information or a frequency list of the TN area corresponding to the NTN cell; geographical area information of the TN area corresponding to the NTN cell; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0221] Optionally, the first information includes the second information and / or the third information, the second information is carried in the broadcast message, the third information is carried in the dedicated signaling, and / or the third information is determined by the terminal device based on the measurement result.

[0222] Optionally, the first information includes second information and third information, the second information is related to the TN area corresponding to the NTN cell, and the third information is related to the first TN area.

[0223] Optionally, when the third information is carried in dedicated signaling, the dedicated signaling includes RRC signaling or NAS signaling.

[0224] Optionally, the third information is carried in one of the following dedicated signalings: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; capability query signaling received by the terminal device; RRC recovery signaling received by the terminal device.

[0225] Optionally, the first information is carried in a broadcast message, and the TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current moment, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment.

[0226] Optionally, the one or more first TN areas are determined according to distances between the terminal device and multiple TN areas corresponding to the NTN cell.

[0227] Optionally, the one or more first TN areas are further determined according to a first distance threshold and / or a coefficient related to the first distance threshold.

[0228] Optionally, the coefficient of the first distance threshold includes a first coefficient α and a second coefficient β, the NTN cell corresponds to M first TN areas, and the distance Z between the terminal device and the jth TN area in the M TN areas is j The jth TN area is the first TN area when the following conditions are met:

[0229] α×Z target ≤Z j ≤β×Z target ;

[0230] Among them, Z target represents the first distance threshold, j is a natural number from 0 to N-1.

[0231] Optionally, the timing for the terminal device to perform cell switching or cell reselection is determined according to operating parameters of the terminal device and / or a satellite in the NTN system.

[0232] Optionally, the operating parameters include moving speed and motion trajectory, and the motion trajectory of the terminal device and / or satellite is used to determine the distance between the terminal device and the first boundary, and the first boundary includes one of the following boundaries: the edge of the NTN cell; the boundary between the NTN cell and the TN area corresponding to the NTN cell, and the geographical area information of the TN area is represented by the center position and radius of the TN area.

[0233] Optionally, the timing for the terminal device to perform cell handover or cell reselection is represented by a first time period T starting from the current moment, and the first time period T is expressed as: T=min(t1, t2)-t;

[0234] Wherein, t represents the time for the terminal device to perform cell switching or cell reselection;

[0235] D1 represents the distance between the terminal device and the first boundary closest to the direction of the terminal device's motion trajectory, V u Indicates the moving speed of the terminal device, V trepresents the moving speed of the satellite, Indicates V u With V t The angle between

[0236] D2 represents the distance between the terminal device and the first boundary closest to the terminal device in the vertical direction along the motion trajectory of the terminal device. Not 0.

[0237] Figure 12 shows a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 12 indicate that the unit or module is optional. Device 1200 may be used to implement the method described in the above method embodiment. Device 1200 may be a chip, a terminal device, or a network device.

[0238] The device 1200 may include one or more processors 1210. The processor 1210 may support the device 1200 to implement the method described in the above method embodiment. The processor 1210 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0239] The apparatus 1200 may further include one or more memories 1220. The memories 1220 store programs that can be executed by the processor 1210, causing the processor 1210 to perform the methods described in the above method embodiments. The memories 1220 may be independent of the processor 1210 or integrated into the processor 1210.

[0240] The apparatus 1200 may further include a transceiver 1230. The processor 1210 may communicate with other devices or chips via the transceiver 1230. For example, the processor 1210 may transmit and receive data with other devices or chips via the transceiver 1230.

[0241] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal device or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal device or network device in each embodiment of the present application.

[0242] The computer-readable storage medium may be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, or a magnetic tape), an optical medium (e.g., a digital versatile disc (DVD)), or a semiconductor medium (e.g., a solid state drive (SSD)).

[0243] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal device or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0244] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from a website, a computer, a server or a data center via a wired

[0245] The data is transmitted to another website, computer, server or data center by means of (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.).

[0246] The present application also provides a computer program that can be applied to a terminal device or network device provided in the present application, and enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0247] The terms "system" and "network" in this application may be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first," "second," "third," and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having," as well as any variations thereof, are intended to cover non-exclusive inclusions.

[0248] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0249] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0250] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., including a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to a definition in a protocol.

[0251] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, for example, it may include an LTE protocol, a NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0252] In the embodiments of the present application, determining B based on A does not mean determining B only based on A. B can also be determined based on A and / or other information.

[0253] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0254] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0255] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0256] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0257] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0258] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for wireless communication, characterized in that: include: The terminal device determines, according to the first information, one or more first terrestrial network TN areas related to the terminal device in a non-terrestrial network NTN cell, wherein the one or more first TN areas are used by the terminal device to determine a target TN cell for cell switching or cell reselection; The first information includes one or more of the following: Frequency information or frequency list of the TN area corresponding to the NTN cell; Geographical area information of the TN area corresponding to the NTN cell; The geographical area information of each cell in the TN area corresponding to the NTN cell.

2. The method according to claim 1, characterized in that The first information includes second information and / or third information, the second information is carried in a broadcast message, the third information is carried in dedicated signaling, and / or the third information is determined by the terminal device according to a measurement result.

3. The method according to claim 2, characterized in that The first information includes the second information and the third information, the second information is related to the TN area corresponding to the NTN cell, and the third information is related to the first TN area.

4. The method according to claim 2 or 3, characterized in that: In the case where the third information is carried in dedicated signaling, the dedicated signaling includes radio resource control RRC signaling or non-access stratum NAS signaling.

5. The method according to claim 4, characterized in that The third information is carried in the following dedicated signaling: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; Capability query signaling received by the terminal device; The RRC recovery signaling received by the terminal device.

6. The method according to claim 2 or 3, characterized in that: In the case where the third information is determined by the terminal device according to a measurement result, the measurement result includes the transmission power of the network devices corresponding to one or more first TN areas measured by the terminal device.

7. The method according to claim 6, characterized in that The target TN cell is also determined based on the relative distance between the multiple network devices corresponding to the one or more first TN areas and the terminal device, and / or the load conditions of the multiple network devices corresponding to the one or more first TN areas.

8. The method according to claim 7, characterized in that Each of the one or more first TN areas corresponds to N network devices, where N is a natural number greater than 1, and the target TN cell is determined according to the first parameters of the N network devices corresponding to each of the first TN areas, and the first parameter Q of the i-th network device among the N network devices pu,i It is expressed as: Among them, P i Represents the transmission power of the i-th network device, i is a natural number from 0 to N-1, Z i represents the distance between the terminal device and the center point of the i-th network device, R i represents the distance from the center point of the ith network device to the edge of the service area, L i Indicates the load saturation of the ith network device, L i The value range is [0,1].

9. The method according to any one of claims 1 to 8, characterized in that The TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current moment, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment.

10. The method according to any one of claims 1 to 9, characterized in that The one or more first TN areas are determined according to the distance between the terminal device and the multiple TN areas corresponding to the NTN cell.

11. The method according to claim 10, characterized in that The one or more first TN areas are further determined according to a first distance threshold and / or a coefficient associated with the first distance threshold.

12. The method according to claim 11, characterized in that The coefficients of the first distance threshold include a first coefficient α and a second coefficient β. The NTN cell corresponds to M TN areas. The distance Z between the terminal device and the jth TN area among the M TN areas is j The jth TN region is the first TN region when the following conditions are met: α×Z target ≤Z j ≤β×Z target ; Among them, Z target Represents the first distance threshold, j is a natural number from 0 to M-1.

13. The method according to any one of claims 1 to 12, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is determined according to the operating parameters of the terminal device and / or the satellite in the NTN system.

14. The method according to claim 13, characterized in that The operating parameters include a moving speed and a moving trajectory. The moving trajectory of the terminal device and / or the satellite is used to determine the distance between the terminal device and a first boundary. The first boundary includes one of the following boundaries: The edge of the NTN cell; The boundary between the NTN cell and the TN area corresponding to the NTN cell, the geographical area information of the TN area is represented by the center position and radius of the TN area.

15. The method according to claim 14, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is represented by a first time period T starting from the current moment, and the first time period T is represented by: T=min(t1, t2)-t; Wherein, t represents the time for the terminal device to perform cell switching or cell reselection; D1 represents the distance between the terminal device and the first boundary closest to the direction of the movement trajectory of the terminal device, V u represents the moving speed of the terminal device, V t represents the moving speed of the satellite, Indicates V u With V t The angle between D2 represents the distance between the terminal device and the first boundary closest to the vertical direction of the motion trajectory of the terminal device. Not 0.

16. A method for wireless communication, characterized in that: include: The network device sends first information to the terminal device, where the first information is used to determine one or more first terrestrial network TN areas related to the terminal device in a non-terrestrial network NTN cell, and the one or more first TN areas are used by the terminal device to determine a target TN cell for cell switching or cell reselection; The first information includes one or more of the following: Frequency information or frequency list of the TN area corresponding to the NTN cell; Geographical area information of the TN area corresponding to the NTN cell; The geographical area information of each cell in the TN area corresponding to the NTN cell.

17. The method according to claim 16, characterized in that The first information includes second information and / or third information, the second information is carried in a broadcast message, the third information is carried in dedicated signaling, and / or the third information is determined by the terminal device according to a measurement result.

18. The method according to claim 17, characterized in that The first information includes the second information and the third information, the second information is related to the TN area corresponding to the NTN cell, and the third information is related to the first TN area.

19. The method according to claim 17 or 18, characterized in that In the case where the third information is carried in dedicated signaling, the dedicated signaling includes radio resource control RRC signaling or non-access stratum NAS signaling.

20. The method according to claim 19, characterized in that The third information is carried in the following dedicated signaling: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; Capability query signaling received by the terminal device; The RRC recovery signaling received by the terminal device.

21. The method according to any one of claims 16 to 20, characterized in that The TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current moment, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment.

22. The method according to any one of claims 16 to 21, characterized in that The one or more first TN areas are determined according to the distance between the terminal device and the multiple TN areas corresponding to the NTN cell.

23. The method according to claim 22, characterized in that The one or more first TN areas are further determined according to a first distance threshold and / or a coefficient associated with the first distance threshold.

24. The method according to claim 23, characterized in that The coefficients of the first distance threshold include a first coefficient α and a second coefficient β. The NTN cell corresponds to M TN areas. The distance Z between the terminal device and the jth TN area among the M TN areas is j The jth TN region is the first TN region when the following conditions are met: α×Z target ≤Z j ≤β×Z target ; Among them, Z target Represents the first distance threshold, j is a natural number from 0 to M-1.

25. The method according to any one of claims 16 to 24, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is determined according to the operating parameters of the terminal device and / or the satellite in the NTN system.

26. The method according to claim 25, characterized in that The operating parameters include a moving speed and a moving trajectory. The moving trajectory of the terminal device and / or the satellite is used to determine the distance between the terminal device and a first boundary. The first boundary includes one of the following boundaries: The edge of the NTN cell; The boundary between the NTN cell and the TN area corresponding to the NTN cell, the geographical area information of the TN area is represented by the center position and radius of the TN area.

27. The method according to claim 26, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is represented by a first time period T starting from the current moment, and the first time period T is represented by: T=min(t1, t2)-t; Wherein, t represents the time for the terminal device to perform cell switching or cell reselection; D1 represents the distance between the terminal device and the first boundary closest to the direction of the movement trajectory of the terminal device, V u represents the moving speed of the terminal device, V t represents the moving speed of the satellite, Indicates V u With V t The angle between D2 represents the distance between the terminal device and the first boundary closest to the vertical direction of the motion trajectory of the terminal device. Not 0.

28. A device for wireless communication, characterized in that: The device is a terminal device, and the terminal device includes: A determining unit, configured to determine one or more first terrestrial network TN areas related to the terminal device in a non-terrestrial network NTN cell according to the first information, wherein the one or more first TN areas are used by the terminal device to determine a target TN cell for cell switching or cell reselection; The first information includes one or more of the following: Frequency information or frequency list of the TN area corresponding to the NTN cell; Geographical area information of the TN area corresponding to the NTN cell; The geographical area information of each cell in the TN area corresponding to the NTN cell.

29. The device according to claim 28, characterized in that The first information includes second information and / or third information, the second information is carried in a broadcast message, the third information is carried in dedicated signaling, and / or the third information is determined by the terminal device according to a measurement result.

30. The device according to claim 29, characterized in that The first information includes the second information and the third information, the second information is related to the TN area corresponding to the NTN cell, and the third information is related to the first TN area.

31. The device according to claim 29 or 30, characterized in that In the case where the third information is carried in dedicated signaling, the dedicated signaling includes radio resource control RRC signaling or non-access stratum NAS signaling.

32. The device according to claim 31, characterized in that The third information is carried in the following dedicated signaling: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; Capability query signaling received by the terminal device; The RRC recovery signaling received by the terminal device.

33. The device according to claim 29 or 30, characterized in that In the case where the third information is determined by the terminal device according to a measurement result, the measurement result includes the transmission power of the network devices corresponding to one or more first TN areas measured by the terminal device.

34. The device according to claim 33, characterized in that The target TN cell is also determined based on the relative distance between the multiple network devices corresponding to the one or more first TN areas and the terminal device, and / or the load conditions of the multiple network devices corresponding to the one or more first TN areas.

35. The device according to claim 34, characterized in that Each of the one or more first TN areas corresponds to N network devices, where N is a natural number greater than 1, and the target TN cell is determined according to the first parameters of the N network devices corresponding to each of the first TN areas, and the first parameter Q of the i-th network device among the N network devices pu,i It is expressed as: Among them, P i Represents the transmission power of the i-th network device, i is a natural number from 0 to N-1, Z i represents the distance between the terminal device and the center point of the i-th network device, R i represents the distance from the center point of the ith network device to the edge of the service area, L i Indicates the load saturation of the ith network device, L i The value range is [0,1].

36. The device according to any one of claims 28 to 35, characterized in that The TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current moment, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment.

37. The device according to any one of claims 28 to 36, characterized in that The one or more first TN areas are determined according to the distance between the terminal device and the multiple TN areas corresponding to the NTN cell.

38. The device according to claim 37, characterized in that The one or more first TN areas are further determined according to a first distance threshold and / or a coefficient associated with the first distance threshold.

39. The device according to claim 38, characterized in that The coefficients of the first distance threshold include a first coefficient α and a second coefficient β. The NTN cell corresponds to M TN areas. The distance Z between the terminal device and the jth TN area among the M TN areas is j The jth TN region is the first TN region when the following conditions are met: α×Z target ≤Z j ≤β×Z target ; Among them, Z target Represents the first distance threshold, j is a natural number from 0 to M-1.

40. The device according to any one of claims 28 to 39, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is determined according to the operating parameters of the terminal device and / or the satellite in the NTN system.

41. The device according to claim 40, characterized in that The operating parameters include a moving speed and a moving trajectory. The moving trajectory of the terminal device and / or the satellite is used to determine the distance between the terminal device and a first boundary. The first boundary includes one of the following boundaries: The edge of the NTN cell; The boundary between the NTN cell and the TN area corresponding to the NTN cell, the geographical area information of the TN area is represented by the center position and radius of the TN area.

42. The device according to claim 41, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is represented by a first time period T starting from the current moment, and the first time period T is represented by: T=min(t1, t2)-t; Wherein, t represents the time for the terminal device to perform cell switching or cell reselection; D1 represents the distance between the terminal device and the first boundary closest to the direction of the movement trajectory of the terminal device, V u represents the moving speed of the terminal device, V t represents the moving speed of the satellite, Indicates V u With V t The angle between D2 represents the distance between the terminal device and the first boundary closest to the vertical direction of the motion trajectory of the terminal device. Not 0.

43. A device for wireless communication, characterized in that: The device is a network device, and the network device includes: A sending unit, configured to send first information to a terminal device, wherein the first information is used to determine one or more first terrestrial network TN areas related to the terminal device in a non-terrestrial network NTN cell, and the one or more first TN areas are used by the terminal device to determine a target TN cell for cell switching or cell reselection; The first information includes one or more of the following: Frequency information or frequency list of the TN area corresponding to the NTN cell; Geographical area information of the TN area corresponding to the NTN cell; The geographical area information of each cell in the TN area corresponding to the NTN cell.

44. The device according to claim 43, characterized in that The first information includes second information and / or third information, the second information is carried in a broadcast message, the third information is carried in dedicated signaling, and / or the third information is determined by the terminal device according to a measurement result.

45. The device according to claim 44, characterized in that The first information includes the second information and the third information, the second information is related to the TN area corresponding to the NTN cell, and the third information is related to the first TN area.

46. ​​The device according to claim 44 or 45, characterized in that In the case where the third information is carried in dedicated signaling, the dedicated signaling includes radio resource control RRC signaling or non-access stratum NAS signaling.

47. The device according to claim 46, characterized in that The third information is carried in the following dedicated signaling: RRC establishment signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; Capability query signaling received by the terminal device; The RRC recovery signaling received by the terminal device.

48. The device according to any one of claims 43 to 47, characterized in that The TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current moment, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current moment and / or the TN area covered after the current moment.

49. The device according to any one of claims 43 to 48, characterized in that The one or more first TN areas are determined according to the distance between the terminal device and the multiple TN areas corresponding to the NTN cell.

50. The device according to claim 49, characterized in that The one or more first TN areas are further determined according to a first distance threshold and / or a coefficient associated with the first distance threshold.

51. The device according to claim 50, characterized in that The coefficients of the first distance threshold include a first coefficient α and a second coefficient β. The NTN area corresponds to M TN areas. The distance Z between the terminal device and the jth TN area among the M TN areas is j The jth TN cell is the first TN area when the following conditions are met: α×Z target ≤Z j ≤β×Z target ; Among them, Z target Represents the first distance threshold, j is a natural number from 0 to M-1.

52. The device according to any one of claims 43 to 51, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is determined according to the operating parameters of the terminal device and / or the satellite in the NTN system.

53. The device according to claim 52, characterized in that The operating parameters include a moving speed and a moving trajectory. The moving trajectory of the terminal device and / or the satellite is used to determine the distance between the terminal device and a first boundary. The first boundary includes one of the following boundaries: The edge of the NTN cell; The boundary between the NTN cell and the TN area corresponding to the NTN cell, the geographical area information of the TN area is represented by the center position and radius of the TN area.

54. The device according to claim 53, characterized in that The timing for the terminal device to perform the cell switching or the cell reselection is represented by a first time period T starting from the current moment, and the first time period T is represented by: T=min(t1, t2)-t; Wherein, t represents the time for the terminal device to perform cell switching or cell reselection; D1 represents the distance between the terminal device and the first boundary closest to the direction of the movement trajectory of the terminal device, V u represents the moving speed of the terminal device, V t represents the moving speed of the satellite, Indicates V u With V t The angle between D2 represents the distance between the terminal device and the first boundary closest to the vertical direction of the motion trajectory of the terminal device. Not 0.

55. A communication device, characterized in that: The invention comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory to execute the method according to any one of claims 1 to 27.

56. A device, characterized in that The invention comprises a processor, which is used to call a program from a memory to execute the method according to any one of claims 1 to 27.

57. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 27.

58. A computer-readable storage medium, characterized in that: A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 27.

59. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 27.

60. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 27.

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