Method and apparatus for wireless communication

Abstract

The application provides a method and device for wireless communication, which helps terminal devices in an NTN cell to reasonably select a target TN cell for cell switching or cell reselection. The method comprises: a terminal device determining one or more first TN areas related to the terminal device in an NTN cell according to 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 comprises one or more of the following: frequency information or a frequency list of TN areas corresponding to the NTN cell; geographical area information of TN areas corresponding to the NTN cell; geographical area information of each cell in the TN areas corresponding to the NTN cell.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a method and apparatus for wireless communication. Background Technology

[0002] In non-terrestrial network (NTN) systems, NTN cells have a large coverage area and may encompass 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 determine their associated TN cells within the coverage area of ​​the NTN serving cell is a problem that needs to be solved. Summary of the Invention

[0003] This application provides a method and apparatus for wireless communication. The various aspects related to the embodiments of this application are described below.

[0004] In a first aspect, a method for wireless communication is provided, comprising: a terminal device determining one or more first TN areas associated with the terminal device in an NTN cell based on first information, wherein the one or more first TN areas are used by the terminal device to determine a target TN cell for cell handover 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; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0005] In a second aspect, a method for wireless communication is provided, comprising: a network device sending first information to a terminal device, the first information being used to determine one or more first TN areas associated with 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 handover 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; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0006] Thirdly, an apparatus for wireless communication is provided, the apparatus being a terminal device, the terminal device comprising: a determining unit, configured to determine one or more first TN areas associated with 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 handover 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; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0007] Fourthly, an apparatus for wireless communication is provided, the apparatus being a network device, the network device comprising: a transmitting unit configured to transmit first information to a terminal device, the first information being configured to determine one or more first TN areas associated with 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 handover 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; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0008] Fifthly, a communication device is provided, including a memory and a processor, the memory for storing a program, and the processor for calling the program in the memory to perform the method as described in the first or second aspect.

[0009] A sixth aspect provides an apparatus including a processor for calling a program from memory to perform the method as described in the first or second aspect.

[0010] A seventh aspect provides a chip including a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in the first or second aspect.

[0011] Eighthly, a computer-readable storage medium is provided having a program stored thereon that causes a computer to perform the method as described in the first or second aspect.

[0012] Ninth aspect, a computer program product is provided, including a program that causes a computer to perform the method as described in the first or second aspect.

[0013] In a tenth aspect, a computer program is provided that causes a computer to perform the method as described in the first or second aspect.

[0014] In this embodiment, the terminal device can determine the TN area associated with the NTN cell based on parameter information of some or all of the TN areas. The TN area associated with the terminal device can be used to determine the target TN cell for cell handover or cell reselection, which helps the terminal device to perform reasonable cell handover or reselection and ensure service continuity. Attached Figure Description

[0015] Figure 1 This is the wireless communication system used in the embodiments of this application.

[0016] Figure 2 This is an NTN system used in the embodiments of this application.

[0017] Figure 3 This is another NTN system used in the embodiments of this application.

[0018] Figure 4 This is a flowchart illustrating a method for wireless communication provided in an embodiment of this application.

[0019] Figure 5 This is a flowchart illustrating one possible implementation of an embodiment of this application.

[0020] Figure 6 This is a flowchart illustrating another possible implementation of an embodiment of this application.

[0021] Figure 7 This is a flowchart illustrating another possible implementation of an embodiment of this application.

[0022] Figure 8 This is a flowchart illustrating another possible implementation of an embodiment of this application.

[0023] Figure 9 This is a flowchart illustrating another possible implementation of an embodiment of this application.

[0024] Figure 10 This is a schematic diagram of a method for wireless communication provided in an embodiment of this application.

[0025] Figure 11 This is a schematic diagram of another method for wireless communication provided in an embodiment of this application.

[0026] Figure 12 This is a schematic structural diagram of a communication device provided in an embodiment of this application. Detailed Implementation

[0027] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art without creative effort regarding the embodiments of this application are within the scope of protection of this application.

[0028] The embodiments of this application can be applied to various communication systems. For example, the embodiments of this application can be applied to Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A), New Radio (NR), evolution systems of NR, LTE-based access to unlicensed spectrum (LTE-U), NR-based access to unlicensed spectrum (NR-U), NTN, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), and 5th-generation (5G) systems. The embodiments of this application can also be applied to other communication systems, such as future communication systems. These future communication systems could be, for example, sixth-generation (6G) mobile communication systems or satellite communication systems.

[0029] Traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, communication systems can support not only traditional cellular communication but also one or more other types of communication. For example, a communication system can support one or more of the following communication methods: 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. The embodiments of this application can also be applied to communication systems that support the above-mentioned communication methods.

[0030] The communication system in this application embodiment can be applied to carrier aggregation (CA) scenarios, dual connectivity (DC) scenarios, and standalone (SA) network deployment scenarios.

[0031] The communication system in this application embodiment can be applied to unlicensed spectrum. This unlicensed spectrum can also be considered a shared spectrum. Alternatively, the communication system in this application embodiment can also be applied to licensed spectrum. This licensed spectrum can also be considered a dedicated spectrum.

[0032] The embodiments of this application can be applied to NTN systems. As an example, the NTN system may include a 4G-based NTN system, an NR-based NTN system, an Internet of Things (IoT)-based NTN system, and a narrowband Internet of Things (NB-IoT)-based NTN system.

[0033] A communication system may include one or more terminal devices. The terminal devices mentioned in the embodiments of this application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication equipment, user agent, or user device, etc.

[0034] 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, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA) device, handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, terminal device in a next-generation communication system (e.g., NR system), or terminal device in a future evolved public land mobile network (PLMN) network, etc.

[0035] 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, an in-vehicle device, etc., with wireless connectivity. As some specific examples, the terminal device may be a mobile phone, tablet, laptop, PDA, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc.

[0036] In some embodiments, the terminal device may be deployed on land. For example, the terminal device may be deployed indoors or outdoors. In some embodiments, the terminal device may be deployed on water, such as on a ship. In some embodiments, the terminal device may be deployed in the air, such as on an airplane, balloon, or satellite.

[0037] In addition to terminal devices, the communication system may also include one or more network devices. In this embodiment, the network device can be a device for communicating with the terminal device; this network device may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. In this embodiment, the network device may refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. Base stations can broadly encompass various names listed below, or be replaced by names such as: NodeB, Evolved NodeB (eNB), Next Generation NodeB (gNB), Relay Station, Access Point, Transmitting and Receiving Point (TRP), Transmitting Point (TP), Master NodeB, Secondary NodeB (SeNB), Multimode Radio (MSR) Node, Home Base Station, Network Controller, Access Node, Wireless Node, Access Point (AP), Transmitting Node, Transceiver Node, Baseband Unit (BBU), Remote Radio Unit (RRU), Active Antenna Unit (AAU), Remote Radio Head (RRH), Central Unit (CU), Distributed Unit (CU) Base stations can be macro base stations, micro base stations, relay nodes, donor nodes, or similar entities, or combinations thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, equipment performing base station functions in D2D, V2X, and M2M communications, network-side equipment in 6G networks, or equipment performing base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or equipment forms used in the network equipment.

[0038] 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 depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

[0039] In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0040] By way of example and not limitation, in the embodiments of this application, the network device may have mobility characteristics; for example, the network device may be a mobile device. In some embodiments of this application, the network device may be a satellite or a balloon station. In some embodiments of this application, the network device may also be a base station located on land, water, or other similar locations.

[0041] In this embodiment, the network device can provide services to a cell. The terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell can be the cell corresponding to the network device (e.g., a base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0042] For example, Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this application. Figure 1 As shown, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area.

[0043] Figure 1 An exemplary diagram shows a network device and two terminal devices. In some embodiments of this 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. This application does not limit the scope of the embodiments.

[0044] For example, Figure 2 This is a schematic diagram of an architecture of the NTN system mentioned above. Figure 2 The NTN system 200 shown uses satellite 210 as its airborne platform. For example... Figure 2 As shown, the satellite radio access network includes a satellite 210, a service link 220, a feeder link 230, terminal equipment 240, a gateway (GW) 250, and a network 260 including base stations and a core network.

[0045] Satellite 210 is a spacecraft based on a space platform. Service link 220 refers to the link between satellite 210 and terminal equipment 240. Feeder link 230 refers to the link between gateway 250 and satellite 210. The Earth-based gateway 250 connects satellite 210 to a base station or core network, depending on the chosen architecture.

[0046] Figure 2 The NTN architecture shown is a bend-type transponder architecture. In this architecture, the base station is located on Earth behind gateway 250, and satellite 210 acts as a relay. Satellite 210 operates as a relay that forwards signals from feeder link 230 to serving link 220, or forwards signals from serving link 220 to feeder link 230. That is, satellite 210 does not have the function of a base station; communication between terminal device 240 and the base station in network 260 needs to be relayed through satellite 210.

[0047] For example, Figure 3 This is a schematic diagram of another architecture for the NTN system. (Example:) Figure 3 As shown, the satellite radio access network 300 includes a satellite 310, a service link 320, a feeder link 330, terminal equipment 340, a gateway 350, and a network 360. Figure 2 The difference is that satellite 310 has base station 312, while the network 360 behind gateway 350 only includes the core network.

[0048] Figure 3 The NTN architecture shown 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.

[0049] exist Figure 2 and Figure 3 The communication system with the architecture shown may include multiple network devices, and each network device may include other terminal devices within its coverage area. This application embodiment does not limit this.

[0050] In the embodiments of this application, Figures 1 to 3 The communication system shown may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but this application does not limit this.

[0051] It should be understood that devices with communication functions in the network / system of this application embodiment can be referred to as communication devices. Figure 1Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as network controllers, mobility management entities and other network entities. This application embodiment does not limit this.

[0052] To facilitate understanding, some related technical knowledge involved in the embodiments of this application is first introduced. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0053] With the development of communication technologies, communication systems (such as 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.

[0054] NTN refers to a network or network segment that uses radio frequency (RF) resources on satellite or unmanned aerial system (UAS) platforms. Taking satellites as an example, communication satellites are classified according to their orbital altitude into low Earth orbit (LEO) satellites, medium Earth orbit (MEO) satellites, geostationary Earth orbit (GEO) satellites, and highly elliptical orbit (HEO) satellites. LEO is a geocentric orbit with an altitude of 2000 kilometers or less, or at least 11.25 cycles per day, with 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 speeds (mobility), but in predictable or deterministic orbits.

[0055] Satellites at different orbital altitudes have different orbital periods.

[0056] LEO: Typical altitude is 250-1500 km, orbital period is 90-120 minutes.

[0057] MEO: Typical altitude is 5,000-25,000 km, and orbital period is 3-15 hours.

[0058] GEO: The altitude is approximately 35,786 kilometers, and the orbital period is 24 hours.

[0059] From the example of satellites mentioned earlier Figure 2 and Figure 3 It is known that typical scenarios for NTN systems accessing terminal devices involve NTN transparent payloads or NTN regenerative payloads. Among them, Figure 2 The bent-tube transponder architecture shown corresponds to the NTN transparent payload. Figure 3 The regenerative transponder architecture shown corresponds to the NTN regenerative payload.

[0060] In NTN systems, both satellite and unmanned aerial vehicle (UAV) systems possess strong mobility. The cells projected onto the ground by satellites can be relatively fixed to the ground or move with the satellite. Taking the serving cell corresponding to a LEO satellite as an example, the cells projected onto the ground by LEO satellites typically include two modes: quasi-fixed cells and quasi-moving cells.

[0061] A stationary cell relative to the ground can refer to a service cell covering a fixed geographical area. For example, different LEO satellites achieve coverage of the same area by adjusting their antenna pointing angles; when one LEO satellite cannot cover the area, another LEO satellite takes over. For satellites in geosynchronous orbit (GSO), the cell projected onto the ground can be a fixed cell. For satellites in non-geosynchronous orbit (NGSO), this fixed cell can be served by multiple satellites that alternate coverage.

[0062] A mobile cell can refer to a serving cell whose coverage area changes. For example, a cell projected onto the ground by an LEO satellite can move along with the satellite. Generally, when the antenna of an LEO satellite is perpendicular to the ground, the cell projected onto the ground by the LEO satellite is a mobile cell. Whether an LEO satellite acts as a standalone 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 signal may no longer be able to cover the terminal device. If the network deployment is relatively complete, another LEO satellite will come to cover the terminal device. Because the satellite system is spherical, the next LEO satellite may come from various angles.

[0063] Compared to the cellular networks used in traditional communication systems (e.g., NR), the coverage area of ​​serving cells in NTN systems is typically much 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 cities with multiple deployed TN cells, or it can cover remote or maritime areas without TN cells. In some embodiments, the coverage area of ​​an NTN cell may span across countries. Therefore, in some scenarios, the actual number of TN cells within the coverage area of ​​a complete NTN cell can be very large.

[0064] In a quasi-Earth mobile cell scenario, as the airborne platform moves, the NTN cell will cover different geographical areas. Due to these different geographical areas, the TN area covered by the mobile cell will also differ. Therefore, if an NTN cell is updated, its currently covered TN geographical area may also be updated accordingly. For example, for an Earth mobile cell, the coverage area of ​​the serving cell also moves due to the movement of the satellite. Considering the high speed of satellite movement, the TN cell information corresponding to the mobile cell will be updated very frequently.

[0065] NTN systems are mobile, while TN deployments are relatively static, meaning TN coverage data has a very long validity period. Therefore, for terminal devices within an NTN area, handover from an NTN cell to a TN cell or TN cell reselection helps ensure service continuity. To facilitate handover to a TN area, when there is a TN coverage area within the NTN coverage area, the network (NW) needs to inform the terminal device of the TN coverage area within its NTN cell. In other words, the terminal device needs to know the surrounding TN areas to optimize measurements for cell handover or cell reselection. For example, for terminal devices performing vehicle-to-everything (V2X) edge communication within an NTN area, knowing the surrounding TN coverage areas is necessary for appropriate cell handover. Similarly, inactive terminal devices need to know the surrounding TN coverage areas or base station information when resuming radio resource control (RRC) to ensure service continuity.

[0066] Furthermore, in certain scenarios within an NTN system, terminal devices may be in high-speed motion. In other words, the speed of the terminal device's movement cannot be ignored relative to the movement of the satellite. For these terminal devices, cell handovers may be necessary between multiple NTN and TN cells along their movement trajectory to ensure service continuity. Therefore, terminal devices need to be well-informed about the TN areas or network equipment along their movement trajectory to facilitate timely cell handovers.

[0067] To optimize terminal equipment measurements on TN neighboring cells used for cell handover or cell reselection, the problem to be solved is how to provide TN cells related to the terminal equipment within the coverage area of ​​the NTN service cell.

[0068] It should be noted that the issue mentioned above, which requires notifying terminal devices of TN coverage due to the large coverage area of ​​the NTN system and the mobility of satellites and / or terminal devices, is only an example. The embodiments of this application can be applied to any scenario where TN coverage needs to be notified due to the large coverage area of ​​the cell or the mobility of the communication equipment.

[0069] Based on this, this application proposes a method for wireless communication. In this method, the terminal device can accurately determine the TN coverage area (TN region) within the NTN cell through first information corresponding to signaling or messages, thereby identifying the target TN cell for cell handover or cell reselection. For ease of understanding, the following describes... Figure 4 The methods proposed in the embodiments of this application will be described in detail.

[0070] See Figure 4 In step S410, the terminal device determines one or more first TN areas related to the terminal device in the NTN cell based on the first information.

[0071] The terminal device can be any of the terminal devices described above. In some embodiments, the terminal device is a user equipment in a quasi-ground fixed cell or quasi-ground 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.

[0072] 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 simultaneously. In some embodiments, the terminal device can perform only V2X edge communication.

[0073] Terminal devices can be communication devices in different communication states. For example, a terminal device can be a user device in an idle state, a communication device in the RRC establishment process, or a terminal device in an inactive state; there are no limitations on this.

[0074] The terminal device can be in motion or stationary. In some embodiments, the terminal device may be in a high-speed motion scenario, and during operation, it may be within the coverage area of ​​multiple TN cells. In some embodiments, the operating speed of the terminal device is not negligible relative to the movement of the satellite, and during operation, it may be within the coverage area of ​​multiple NTN mobile cells. In some embodiments, the terminal device may be stationary relative to the ground, and during communication, it may be within the coverage area of ​​different NTN mobile cells.

[0075] The first information can be used by the terminal device to determine one or more associated first TN areas to optimize the measurements performed by the terminal device for cell handover or cell reselection. That is, the terminal device can measure only cells within one or more first TN areas, instead of measuring all surrounding cells, reducing device power consumption. For example, after determining its associated first TN area, the terminal device within an NTN cell can perform a handover from the NTN cell to a TN cell.

[0076] In some embodiments, the information in the first information regarding some or all of the TN areas corresponding to the NTN cell can facilitate the terminal device in determining its surrounding first TN areas. For example, the terminal device can request RRC recovery from cells in the relevant first TN area based on the stored TN area information.

[0077] A TN area describes a terrestrial network coverage area, also known as TN coverage or TN deployment. A TN area typically contains multiple TN cells. In some embodiments, a TN cell can be a cell served by terrestrial network equipment. TN cells are typically static, and the cell data has a long validity period. In some embodiments, a TN cell can be a cell where network equipment provides service for a relatively long period.

[0078] The TN cell in the TN area can be any type of cell mentioned above, such as urban cellars, micro-cells, etc., without any limitation.

[0079] The first TN area is the TN area associated with the terminal device. For example, the first TN area could be the TN area surrounding the terminal device at the current moment. Alternatively, the first TN area could cover the area the terminal device is about to pass through. Or, the first TN area could be the area where the target TN cell for cell handover or cell reselection is located.

[0080] The first TN area associated with the terminal device can be one TN area or multiple TN areas. For example, in an area with a dense distribution of TN areas, multiple TN areas can establish RRC connections with the terminal device. These TN areas may overlap.

[0081] Communication devices can determine one or more first TN areas associated with a terminal device in various 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 an NTN cell. An example of one method for determining the first TN area will be provided below with reference to a formula. In some embodiments, network devices can determine one or more first TN areas associated with a terminal device based on the geographical area information of the TN area and the movement trajectory of the terminal device. In some embodiments, the terminal device can perform a search based on frequency points to determine the first TN area associated with it.

[0082] The terminal device can determine the target TN cell for cell handover or cell reselection based on one or more first TN areas. For example, after determining one or more first TN areas associated with it, the terminal device can perform terminal device measurements for cell handover or cell reselection to determine the target TN cell.

[0083] In some embodiments, the terminal device can establish a connection with a target TN cell to ensure service continuity. For example, switching from an NTN cell to a target TN cell can avoid transmission delays caused by the long communication distance of NTN cells, 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 performance.

[0084] The target TN cell can be a preferred first cell or a plurality of 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 to select a suitable TN cell based on the actual situation during cell handover or cell reselection. For example, when the optimal TN cell determined by measurement is fully loaded, the terminal device can switch to a suboptimal TN cell.

[0085] The first TN region corresponds to multiple TN regions for a time-domain NTN cell. The TN regions corresponding to an NTN cell refer to multiple TN regions within the coverage area of ​​the NTN cell. In some embodiments, for an NTN mobile cell, if the geographical area of ​​the NTN cell's coverage changes, the TN regions within that coverage area also change. In some embodiments, for an NTN fixed cell, the TN regions within the NTN cell's coverage area are relatively fixed.

[0086] As one possible implementation, the TN area corresponding to an NTN cell can include the TN area within the coverage area at the current time, the TN area within the coverage area before the current time, or the TN area within the coverage area after the current time. For example, when the current time is t, the TN area corresponding to an 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.

[0087] In some embodiments, the TN areas corresponding to NTN cells may overlap. For example, in densely populated urban areas, the coverage areas of TN areas may be the same. That is, within the coverage area of ​​an NTN cell, TN areas may be relatively clustered in some areas, resulting in regional overlap.

[0088] The first information may include specific information about the TN area corresponding to the NTN cell, so that the terminal device can determine the associated first TN area. The first information may also be called 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; geographical area information of the TN area corresponding to the NTN cell; and geographical area information of each cell within the TN area corresponding to the NTN cell.

[0089] 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 facilitates measurement by the terminal device. For example, the first information may indicate the frequencies used by the TN area through the frequency list. This frequency list may be a frequency list under each TN coverage area, or a frequency list corresponding to multiple TN areas. For instance, 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 for a period of time, it indicates that these TN areas do not cover the location of the terminal device. Furthermore, the terminal device may search for the cell with the strongest signal based on the frequency points in the frequency list.

[0090] In some embodiments, the first information may include geographic area information of the TN area corresponding to the NTN cell. The geographic area information can be used to identify the coverage area of ​​the TN area, so that the terminal device can determine whether a certain TN cell is in the vicinity of the terminal device.

[0091] In some embodiments, the method of indicating geographic area information of a TN region can be determined based on the actual geographic conditions within the coverage area of ​​the TN region.

[0092] As one possible implementation, the geographical 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 and radius of the TN coverage area can be represented using 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, thereby determining whether it is within the TN coverage area or is about to enter it.

[0093] As another possible implementation, the geographical location of a TN region can be described using the location information of its boundary lines or boundary points. The terminal device can directly determine one or more associated first TN regions based on its own location and the location information of the boundary lines or boundary points of multiple TN regions. For example, the geographical location of a TN region can be represented using a range of latitude and longitude.

[0094] In some embodiments, the first information may include the geographic area information of each cell in the TN area corresponding to the NTN cell. As mentioned above, a TN area typically includes multiple TN cells. The first information may use the location method of the TN cells to indicate the geographic area information of each TN cell in each TN area. For example, the first information may use the location information of network devices in the TN area to indicate the geographic area information of each cell.

[0095] In some embodiments, the first information may include a list of multiple TN regions corresponding to an NTN cell. For example, the first information may include a list of TN regions indicated by geographical area information. For example, the first information may include a list of TN regions indicated by frequency information.

[0096] In some embodiments, the first information may further include specific information about all TN areas within the NTN cell, so that the terminal device can identify all associated first TN areas.

[0097] It should be noted that the TN area corresponding to the NTN cell in the first information can be a portion of the TN area corresponding to the NTN cell, or it can be all of the TN areas corresponding to the NTN cell. In some embodiments, when the information of one or more first TN areas related to the terminal device can be determined by the information of a set of TN areas, the first information may only include the information of that set of TN areas. That is, when the terminal device can determine the relevant TN areas, the first information does not need to include the information of all the TN areas corresponding to the NTN cell.

[0098] The terminal device can obtain the first information in various ways. In some embodiments, the first information may be sent to the terminal device by the network 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 network device transmission and autonomous measurement by the terminal device. For example, the terminal device may receive second information via broadcast and then determine third information through autonomous measurement. In some embodiments, the terminal device may determine the first information solely through autonomous measurement.

[0099] For example, a network device can send first information to a terminal device via broadcast or dedicated signaling. As one embodiment, the terminal device can receive a portion of the first information (e.g., second information) via broadcast, and then receive another portion of the information (e.g., third information) via dedicated signaling. As another embodiment, the terminal device can receive the second information via broadcast, and then determine the third information through a combination of dedicated signaling and autonomous measurement. As another embodiment, the terminal device can receive the first information solely via dedicated signaling.

[0100] Network equipment can be communication equipment providing services on the NTN network side. In some embodiments, network equipment can be a base station providing services via satellite in the NTN system. For example, network equipment can be a satellite. In some embodiments, network equipment can be a non-satellite mobile network device. For example, network equipment can be a base station installed on a low-altitude aircraft.

[0101] Network devices can provide services to terminal devices in various scenarios. In some embodiments, the network device can provide services to the terminal device at the current moment. The terminal device can obtain first information through communication with the network device. In some embodiments, the network device can be a communication 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 the target TN cell. In some embodiments, the network device can be a base station where the terminal device is establishing an RRC connection.

[0102] Network equipment can be communication equipment that moves relative to terminal equipment. Due to the movement of network equipment and / or terminal equipment, terminal equipment needs to perform cell handover or cell reselection. In some embodiments, the network equipment of mobile cells is deployed on satellites, and the satellite and terminal equipment are in relative motion regardless of whether the terminal equipment is stationary or at a negligible speed. In some embodiments, if the terminal equipment has a high mobility rate or for V2X-based services, the mobility rate of the terminal equipment cannot be ignored, and the cell information around the terminal equipment will be updated frequently.

[0103] Network devices can determine the first information in various ways. In some embodiments, since the satellite's trajectory is predictable, the TN area contained within the NTN mobile cell is 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 the ground TN area through communication with the ground core network, thereby determining the first information.

[0104] Network devices can send the first information to terminal devices in various ways. In some embodiments, NTN mobile cells can broadcast the first information based on a predicted trajectory. In some embodiments, NTN mobile cells can combine broadcasting with dedicated signaling to send the first information to more accurately inform the terminal device of the coverage area of ​​the TN region. In some embodiments, NTN mobile cells can send the first information via dedicated signaling based on the location information of the terminal device.

[0105] When the first information is sent via broadcast message, an existing system information block (SIB) can be used, or a new SIB can be created to carry this information. For example, network devices can use the signaling structure in the existing SIB4 to carry the first information. SIB4 can include a list of frequencies and a list of TN coverage areas. To minimize overhead, network devices can define TN coverage areas in a separate information element (IE).

[0106] As one embodiment, the network device may send the first information simply by broadcasting a message. The first information can be determined based on the current coverage area. For example, the network device broadcasts the TN area corresponding to that time at different times. For instance, 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.

[0107] In the implementation of the above embodiments, 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 through 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.

[0108] As one embodiment, the network device can send the first information solely through a broadcast message. The first information may also include predicted TN areas. For example, the network device can predict and determine the specific information of a TN cell using information such as movement trajectory and direction, and generate the first information. The first information in the broadcast message includes not only the TN areas currently covered by the NTN cell, but also the TN areas covered by the NTN cell before and / or after the current time. Therefore, the network device can broadcast more TN areas than are currently covered by the NTN cell, thus eliminating the need for the terminal device to frequently update the SI information.

[0109] For example, the NTN mobile cell covers n TN areas, namely TN area 1, TN area 2, ..., and TN area n. Based on the NTN's mobile speed, and assuming the low-speed mobile rate of the terminal device is negligible, the first information in the broadcast message can contain different content. Optionally, at time t, for terminal devices within the coverage area, the broadcast includes the areas previously covered and the areas currently being covered. Optionally, at time t, for terminal devices within the coverage area, the broadcast includes the area currently being covered and the area to be covered based on prediction results.

[0110] Taking the three time points mentioned above as examples, at time 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 that will be covered soon); at time T2, the NTN mobile cell covers TN area 2 and TN area 3, and broadcasts TN area 1 (areas that were previously covered), TN area 2 and TN area 3; at time T3, the NTN mobile cell covers TN area 3, and broadcasts TN area 1 (areas that were previously covered), TN area 2 (areas that were previously covered) and TN area 3.

[0111] As can be seen from the implementation process of the above embodiments, during the time period from T1 to T3, the content of the first broadcast information does not change, does not need to be triggered for modification, and the terminal device does not need to frequently update the system information.

[0112] As an example, network devices can send the first information by combining broadcast messages with dedicated signaling to reduce the excessive signaling overhead in the two embodiments described above. As mentioned earlier, the actual number of TN areas within the coverage area of ​​a complete NTN cell can be very large. If only broadcast signaling is used to provide data for the TN areas, the signaling overhead will be extremely high. For example, the signaling overhead for the frequency information involved in the coverage information list for each TN coverage area is relatively large. Furthermore, the more accurate the TN area data provided to the terminal device, the higher the success rate of the terminal device performing NTN-TN cell handover or cell reselection. Therefore, to improve data accuracy, the amount of information in the first message can be very large, leading to a sharp increase in broadcast signaling overhead.

[0113] Because TN area data has a very long validity period, the network does not need to frequently update the relevant data in the TN area. Therefore, in this embodiment, when broadcast messages and terminal device-specific signaling are used in combination, the dedicated signaling can bear more overhead, thereby reducing the overhead of broadcast signaling.

[0114] As one implementation method, the terminal equipment dedicated signaling can be dedicated RRC signaling, dedicated non-access stratum (NAS) signaling, or other dedicated signaling, which is not limited here.

[0115] When broadcast messages and dedicated signaling are used in combination, the content of the first message can be represented by multiple messages to enable the terminal device to accurately determine information about nearby TN areas or terrestrial network equipment (e.g., base stations) while reducing broadcast signaling overhead.

[0116] In some embodiments, the first information may include second 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 that determine the target TN cell. That is, 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.

[0117] As a possible implementation, the second information may include frequency information / frequency list for the NTN cell coverage area of ​​the TN. The second information may also include geographic area information for the list of cells (which may overlap) 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 can be defined using center location coordinates and a radius.

[0118] As a possible implementation, the third information can also be determined based on the actual situation of the TN areas and terminal devices within the NTN cell. For example, if there are many TN areas and the movement speed of the terminal devices cannot be ignored, the third information can also include the relative motion information between the satellite and the terminal devices, so that the terminal devices can combine the two pieces of information to more accurately predict the nearby first TN area or terrestrial network device information. Furthermore, when predicting the first TN area, the movement speed of both the terminal devices and the satellites can be considered simultaneously.

[0119] As a possible implementation, the third information may also include a fourth or fifth information, which are sent through different dedicated signaling.

[0120] As a possible implementation, the content of the second and third information can be adjusted based on the transmission method. 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 related to the coverage information list of each TN coverage area.

[0121] When the first information includes the second and third information, the network device can send these two pieces of information via broadcast messages and dedicated signaling, respectively.

[0122] For example, the second information can be carried in a broadcast message. For instance, frequency information / frequency lists of the TN areas covered by an NTN cell can be broadcast via broadcast signaling. Alternatively, corresponding geographic area information can be provided via broadcast signaling over the network through (potentially overlapping) area lists. Another example is broadcasting a frequency list describing each TN coverage area of ​​a group of cells via broadcast signaling.

[0123] For example, the third information can be carried in dedicated signaling. For instance, RRC signaling can be used to send the center location coordinates and radius of a single cell corresponding to each frequency, so that the terminal device can define the center location coordinates and radius information of each cell in each area.

[0124] As one possible implementation, when the third information is carried on dedicated signaling, the network device can send the third information at different times based on the different states of the terminal device. This will be discussed in conjunction with... Figures 5 to 9 An example is provided.

[0125] For example, the third information can be determined by the terminal device based on the measurement results, which will be described in conjunction with the measurement later.

[0126] For example, the third information can also be determined by combining dedicated signaling and measurement results from the terminal device. For instance, the network device can send information about multiple TN areas that are predicted to be relevant to the terminal device via dedicated signaling. The terminal device then refines these TN areas through measurements and other methods, ultimately determining the third information, which includes one or more first TN areas. Further, the terminal device can determine a target TN cell for which cell handover can be performed based on the first TN areas in the third information.

[0127] In some embodiments, the first information may include second information and / or third information, where the second information is carried in a broadcast message and the third information is carried in dedicated signaling and / or determined by the terminal device based on measurement results. Optionally, the first information may only include the second information, and the first information is the second information carried in a broadcast message. Optionally, the first information may only include the third information, and the first information is the third information carried in dedicated signaling. Optionally, the first information may only include the third information, and the first information is the third information determined by the terminal device based on measurement results. Optionally, the first information may only include the third information, and the first information is the third information determined through dedicated signaling and the measurement results of the terminal device. Optionally, the first information includes both second and third information, and the second and third information are determined in different ways.

[0128] Depend on Figure 4 As can be seen, the method in this application embodiment can provide corresponding geographical area information through broadcast signaling of a (potentially overlapping) area list via the network, and further provide specific information about the TN area by attaching useful additional information to the dedicated signaling. This method optimizes the measurement of terminal devices for cell handover or cell reselection when the cell coverage area is large and network devices and terminal devices are in relative motion. Furthermore, it solves the problem of how the NTN network notifies terminal devices of the coverage status of TN areas within the NTN area, and whether the notification to terminal devices is accurate, ensuring that terminal devices know the TN coverage area or base station information, thereby guaranteeing service continuity.

[0129] As mentioned earlier, in certain scenarios, the mobility rate of terminal devices cannot be ignored. For example, when a terminal device is moving at high speed, performing V2X services, or performing NR edge communication. In these scenarios, predicting the TN area associated with the terminal device requires considering both the NTN mobility rate and the terminal device's mobility rate.

[0130] 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 effectively notify the terminal device of the specific information of the first TN area coverage through RRC or NAS dedicated signaling.

[0131] For example, network devices can determine the location of a terminal device at a given time based on predictions and the terminal device's navigation trajectory, so that the network device can transmit relevant TN area information. For instance, the terminal device's navigation trajectory can be determined based on a Global Navigation Satellite System (GNSS) or other navigation routes. Alternatively, the terminal device can report its own navigation trajectory to the NTN network. Or, the NTN network can independently locate and predict the terminal device's movement path.

[0132] 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 distance between the terminal device and multiple TN areas corresponding to the NTN cell.

[0133] For example, the coverage area of ​​the surrounding TN or information about specific base stations within a TN area can be predicted by using the coordinates of the center locations of multiple TN areas when a terminal device is at a certain location. For instance, when an NTN cell corresponds to M TN areas (M being a natural number greater than 1), if the location of the terminal device at a certain moment is represented as P... u (x u y u The coordinates of the center position of the j-th TN region among the M TN regions are represented as (x... j y j If Z is the distance between the terminal device and the center of the j-th TN region, then Z is the distance between the terminal device and the center of the j-th TN region. j It can be represented as:

[0134]

[0135] For example, in multiple TN areas corresponding to an NTN cell, the first TN area can be determined based on a distance threshold. For instance, the first TN area can be determined based on a first distance threshold. This first distance threshold can be a distance threshold value Z set by the NTN network for the first TN area. target For example, the first TN region can be determined based on a first distance threshold and a coefficient related to the first distance threshold.

[0136] For example, the coefficient 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. j The following conditions must be met: α×Z target ≤Z j ≤β×Z target .

[0137] For example, α and β can be different percentages, such as 100%, 80%, 70%, 60%, etc.

[0138] For example, the system can configure two coefficients for the first distance threshold. For instance, it can be configured based on the density of the TN area coverage. The higher the density of the TN area coverage, the higher the coefficients for Z. j The smaller the selected interval, the better.

[0139] As one implementation method, the NTN network can use RRC signaling to notify the terminal device of the Z region of the TN cell. j .

[0140] In some embodiments, the communication device can predict the timing of cell handover or cell reselection for the terminal device based on the offset angle / angle between the terminal device's movement trajectory and the satellite, enabling the terminal device to switch to the ground station at an appropriate time. For example, the terminal device's movement trajectory and the angle between it and the satellite's orbital trajectory can help the terminal device determine the timing of reaching the edge of the NTN cell.

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

[0142] For example, when the mobility rate of the terminal device cannot be ignored, the timing for the terminal device to perform cell handover or cell reselection can be determined based on the operating parameters of the terminal device and / or the operating parameters of the satellites in the NTN system.

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

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

[0145] For example, suppose the moving speed of the terminal device is V. u The satellite's moving speed is V tV u With V t The included angle between them is At the current moment, the distance between the terminal device and the nearest first boundary along the direction of the terminal device's motion trajectory is D1, and the distance between the terminal device and the nearest first boundary perpendicular to the terminal device's motion trajectory is D2. Based on these assumptions, considering the NTN satellite and the terminal device moving along their respective motion trajectories, the time taken to travel in the two directions D1 and D2 are t1 and t2, respectively, which can be expressed as follows:

[0146]

[0147] in, Not zero.

[0148] Further assuming that from the current moment, the terminal device initiates cell handover or cell reselection to the ground station after a time interval T. In other words, the timing of the terminal device's cell handover or cell reselection is represented by the first time interval T starting from the current moment, which can be expressed as:

[0149] T = min(t1, t2) - t;

[0150] Where t represents the time taken 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 empirically by the NTN network.

[0151] In some embodiments, the target TN cell and the timing of handover can be determined based on the operating parameters of the terminal device and the satellite. For example, the location P of the terminal device after a time period T can be determined based on the operating parameters. u Then, the target TN cell is determined based on the multiple distances Zi between the location and multiple first TN cells.

[0152] As mentioned earlier, the third information can be carried in dedicated signaling or determined based on the measurement results of the terminal device. When the third information is carried in dedicated signaling, the network device can determine when to send the third information based on the status of the terminal device. The terminal device can store the third information for subsequent cell reselection or cell handover.

[0153] It should be noted that the first information can also be carried in dedicated signaling. Therefore, the information in dedicated signaling can be the specific coverage information of the entire TN area, or it can only include the specific information of the first TN area. For the sake of distinction, in the embodiments below, TN area information will be used to represent the third information or the first information mentioned above.

[0154] As one possible implementation, for quasi-Earth mobile cells, if the coverage area of ​​the NTN is updated, the RRC proprietary signaling will also differ depending on the status of the terminal device.

[0155] For example, since the RRC connection process includes the establishment, reconfiguration, release, and reconstruction of the RRC connection between the terminal device and the network device (e.g., gNodeB), the third information can be carried in one of the following dedicated signaling messages depending on the state: 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.

[0156] It should be noted that when the first information is carried in dedicated signaling, the signaling carrying the first information can also refer to the dedicated signaling corresponding to the third information, which will not be elaborated here.

[0157] For example, the terminal device can be in the process of establishing an RRC, in an RRC idle state, or in an inactive state. For ease of understanding, the following will illustrate this further. Figures 5 to 9 Exemplary descriptions are provided for dedicated signaling under different states. Specifically, in... Figures 5 to 7 In the three embodiments, the terminal device receives TN area information (third information or first information) via dedicated signaling during the RRC establishment process or in the RRC idle state; Figure 8 and Figure 9 In both embodiments, the terminal device receives TN cell information via dedicated signaling in an inactive state.

[0158] During the RRC establishment process, network devices can notify terminal devices of relevant information, and the terminal devices will store this information.

[0159] As an example, during RRC setup signaling, the NTN network sends information about the covered TN area to the terminal device. The terminal device stores coverage information from surrounding TN cells of the network, specifically as follows: Figure 5 As shown. This information can involve the center location coordinates and radius of each individual cell corresponding to each frequency, in order to define the center location coordinates and radius information of each cell in each region.

[0160] See Figure 5In step S510, the terminal device sends an RRC Setup Request message to the network device. During the initial random access (RA), message 3 (Msg3) transmits the RRC Setup Request message. The RRC Setup Request message carries the reason for RRC setup and the terminal device identifier. The network device establishes a context for the terminal device and performs admission and resource allocation for Signaling Radio Bearer 1 (SRB1) resources.

[0161] In step S520, the network device replies to the terminal device with an RRC Setup response message. This message can also be called an RRC setup signaling message. This message carries detailed information about the SRB1 resource configuration and TN area information.

[0162] In step S530, the terminal device configures radio resources according to the SRB1 resource information indicated by the RRCSetup message, and then sends an RRC Setup Complete message to the network device. This message carries the selected Public Land Mobile Network (PLMN) identifier, the registered AMF, and a list of single network slice selection assistance information (SNSSAI), thus completing the RRC connection establishment. After the network device transparently transmits the NAS direct transmission message between the terminal device and the AMF, the identity lookup, authentication, NAS security mode, and registration processes are completed.

[0163] In step S540, the terminal device stores the TN cell information. There is no specific order between steps S530 and S540.

[0164] As an example, in RRC connect reconfiguration signaling, the NTN network device sends information about the covered TN areas to the terminal device. The terminal device stores coverage information from the surrounding TN areas of the network, specifically as follows: Figure 5 As shown. This information can involve the center location coordinates and radius of each individual cell corresponding to each frequency, in order to define the center location coordinates and radius information of each cell in each region.

[0165] SeeFigure 6 In step S610, the network device sends an RRC connection reconfiguration message to the terminal device, instructing the establishment of SRB2 and data radio bearer (DRB), and carrying TN area information in the message. This message can also be called RRC connection reconfiguration signaling.

[0166] In step S620, after receiving the RRCReconfiguration message, the terminal device begins establishing SRB2 and DRB. After SRB2 and DRB are successfully established, the terminal device replies to the network device with an RRC connection reconfiguration complete message (RRCReconfigurationComplete) indicating that the reconfiguration is complete.

[0167] In step S630, the terminal device stores information about the TN area. There is no specific order between steps S630 and S620.

[0168] As one embodiment, the capability query information of the terminal device may include information about the TN areas covered by the NTN network device sent to the terminal device. The terminal device stores coverage information from the surrounding TN areas of the network, specifically as follows: Figure 5 As shown. This information can involve the center location coordinates and radius of each individual cell corresponding to each frequency, in order to define the center location coordinates and radius information of each cell in each region.

[0169] See Figure 7 In step 710, a capability query is performed between the terminal device and the network device. In this process, the network device sends a UECapabilityEnquiry message to the terminal device, which may carry TN cell information. This message can also be called a capability query signaling. The terminal device replies to the network device with a UECapabilityInformation message, carrying its capability information. The network device then sends a UE RADIO CAPABILITY INFO INDICATION message to the AMF, transparently transmitting the terminal device's capabilities.

[0170] In step S720, the terminal device stores the TN cell information. There is no specific order between step S720 and the terminal device's response to capability information.

[0171] When a terminal device's RRC is inactive, upon recovery from the RRC_INACTIVE state, it can determine the inactive-radio network temporary identifier (I-RNTI) based on the last serving NTN network. If the NTN network identifier can be resolved from the I-RNTI, it can directly request the context data provided by the last serving NTN network, thereby completing the RRC connection recovery process.

[0172] As an example, when the NTN network sends RRC resume signaling to the terminal device, it can carry TN area information. The terminal device will store the TN area information, specifically as follows: Figure 8 As shown.

[0173] See Figure 8 The terminal device is in an RRC inactive state.

[0174] In step S810, the terminal device sends an RRC recovery request (RRCResumeRequest) to the network device.

[0175] In step S820, the network device replies to the terminal device with an RRC recovery message (RRCResume), which carries TN area information. This message can also be called RRC recovery signaling.

[0176] In step S830, the terminal device stores information about the TN region.

[0177] In step S840, the terminal device sends an RRC recovery complete message to the network device.

[0178] As an example, after the RRC connection is established, TN area information can be carried in subsequent RRC connection reconfiguration messages (RRC connection reconfiguration signaling). The terminal device will store the TN area information, see details below. Figure 9 .

[0179] See Figure 9 The terminal device is in RRC connection state.

[0180] In step S910, the network device sends an RRC connection reconfiguration signaling message to the terminal device, carrying TN area information.

[0181] In step S920, the terminal device stores information about the TN region.

[0182] The above text combined Figures 5 to 9This paper introduces several implementation methods for network devices to send TN cell information (third information or first information) to terminal devices. As mentioned earlier, the third information can also be determined by the terminal device based on measurement results. That is, the terminal device can determine the first TN area and the target TN cell through autonomous measurement. The following section provides an illustrative example of the terminal device's measurement process.

[0183] In some embodiments, the measurement of TN frequencies can be optimized based on whether the terminal device is within the coverage area of ​​a TN region. For example, for the terminal device, in addition to... Figures 5 to 9 In addition to receiving TN coverage data from the NTN network device, the device can also detect the existence of TN areas and further refine the first TN area and its covered area, preparing for subsequent cell handover or cell reselection. For example, when the NTN network device provides multiple TN coverage areas to the terminal device, the terminal device can also use autonomous auxiliary measurements to further clarify the first TN area it wants to measure.

[0184] As one implementation method, the terminal device scans all carrier frequencies on its supported standards to search for a suitable cell, i.e., the target TN cell. On each carrier frequency, the terminal device only searches for the cell with the strongest signal and camps on the first target TN cell found. When the terminal device is moving at high speed, the TN area provided by NTN, whether through broadcast, RRC dedicated signaling, or a combination of both, will have significant deviations. In this scenario, it becomes even more important for the terminal device to autonomously determine the TN area.

[0185] For example, the terminal device may be unable to detect any reference signal from the TN frequency for a period of time; in fact, there may not be a TN region at the location of the terminal device. In this case, the terminal device can relax its measurement of the TN frequency or stop measuring the TN frequency altogether.

[0186] For example, if the network does not provide TN area data or the provided TN area data is too vague, the terminal device can autonomously detect TN area information. When the terminal device detects no TN area nearby, it does not need to perform TN neighbor cell measurements. When the TN area is nearby, the terminal device can consider measuring TN neighbor cells based on the serving cell quality. To determine if a TN area is nearby, the terminal device needs to compare its distance to a TN reference location with a specific distance threshold. Since TN areas can be signaled via the area center coordinates and radius, these two parameters can be used as the reference location and distance threshold to determine the distance from the terminal device to the TN area.

[0187] For example, terminal devices can determine the priority of different frequency points based on communication status. For instance, when a terminal device performs both NR edge communication and V2X edge communication simultaneously, the frequency point providing both NR and V2X edge communication can be considered the highest priority. Conversely, if the terminal device is configured to perform only V2X edge communication, the frequency point providing V2X communication can be considered the highest priority.

[0188] For example, in V2X or high-speed movement scenarios, the terminal device can further determine the specific coverage information of base stations in the same / different TN areas based on multiple TN areas notified by the NTN, thus 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.

[0189] As one implementation, when the third information is determined by the terminal device based on measurement results, the measurement results may include the transmit power of network devices 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 within a certain TN area i The transmit power of the terminal device in P or the transmit power of the i-th network device corresponding to the TN area. u The transmission powers of the multiple ground stations measured at the locations are P1, ... P1, ... n .

[0190] For example, the target TN cell is also determined based on the relative distance between multiple network devices and terminal devices corresponding to one or more first TN areas, and / or the load status of multiple network devices corresponding to one or more first TN areas.

[0191] For example, when each of the one or more first TN regions corresponds to N network devices, the target TN cell can be determined based on the first parameters of the N network devices corresponding to each of the one or more first TN regions. In each first TN region, the first parameter can 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.

[0192] For example, the first parameter Q of the i-th network device among N network devices pu,i It can be represented as:

[0193]

[0194] Among them, P i Z represents the transmit power of the i-th network device, where i is a natural number from 0 to N-1. iR represents the distance between the terminal device and the center point of the i-th network device. i L represents the distance from the center point of the i-th network device to the edge of the service area. i L represents the load saturation of the i-th network device. i The value range is [0,1].

[0195] It should be noted that P in the above formula i It can also be expressed as the transmit power of the i-th ground station among N ground stations in a TN area; R i Also referred to 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, while a value of 1 indicates full load.

[0196] The first parameter mentioned above can be used to select a suitable target TN cell for the terminal device, and can also be used to determine the network equipment the terminal device enters within the TN area. For example, it can determine the base station providing services to the terminal device, thereby determining the target TN cell for the terminal device to perform cell handover or cell reselection.

[0197] For example, the network device corresponding to the target TN cell for cell handover or cell reselection by the terminal device can be the network device with the largest first parameter among multiple network devices. Therefore, the first parameter Q of the network device corresponding to the target TN cell is... pu The following conditions must be met:

[0198] Q pu =max{Q pu,i} i＝0,1,…,N―1 .

[0199] For example, the target TN cell for cell handover or cell reselection by the terminal device can be multiple TN cells. Therefore, the network devices corresponding to the target TN cell can also be several network devices with larger first parameters, so as to select the most suitable target TN cell and corresponding network devices according to the actual situation. For example, multiple network devices can be sorted in order according to the first parameter, and the network devices corresponding to the top five first parameters can be a list of network devices near the terminal device in the TN area.

[0200] The above text combined Figures 1 to 9 The method embodiments of this application are described in detail below. Figures 10 to 12 The present application provides a detailed description of the apparatus embodiments. It should be understood that the descriptions of the apparatus embodiments correspond to the descriptions of the method embodiments; therefore, any parts not described in detail can be found in the foregoing method embodiments.

[0201] Figure 10This is a schematic block diagram of a device for wireless communication according to an embodiment of this application. The device 1000 can be any of the terminal devices described above. Figure 10 The terminal device 1000 shown includes a receiving unit 1010.

[0202] The determining 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. The one or more first TN areas are used by the terminal device to determine the target TN cell for cell handover 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; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0203] Optionally, the first information includes the second information and / or the third information, wherein the second information is carried in a broadcast message, the third information is carried in a dedicated signaling, and / or the third information is determined by the terminal device based on the measurement results.

[0204] Optionally, the first information includes second information and third information, where 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.

[0205] Optionally, when the third information is carried in dedicated signaling, the dedicated signaling may include RRC signaling or NAS signaling.

[0206] Optionally, the third information is carried in one of 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; and RRC recovery signaling received by the terminal device.

[0207] Optionally, when the third information is determined by the terminal device based on the measurement results, the measurement results include the transmit power of one or more network devices corresponding to the first TN area as measured by the terminal device.

[0208] Optionally, the target TN cell is also determined based on the relative distance between multiple network devices and terminal devices corresponding to one or more first TN areas, and / or the load status of multiple network devices corresponding to one or more first TN areas.

[0209] Optionally, each of the one or more first TN areas corresponds to N network devices, where N is a natural number greater than 1. The target TN cell is determined based on the first parameters of the N network devices corresponding to each first TN area, where the first parameter Q of the i-th network device among the N network devices is... pu,i Represented as:

[0210]

[0211] Among them, P i Z represents the transmit power of the i-th network device, where i is a natural number from 0 to N-1. i R represents the distance between the terminal device and the center point of the i-th network device. i L represents the distance from the center point of the i-th network device to the edge of the service area. i L represents the load saturation of the i-th network device. i The value range is [0,1].

[0212] Optionally, the TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current time, and the TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current time and / or the TN area covered after the current time.

[0213] Optionally, one or more first TN areas are determined based on the distance between the terminal device and multiple TN areas corresponding to the NTN cell.

[0214] Optionally, one or more first TN regions are further determined based on a first distance threshold and / or a coefficient associated with the first distance threshold.

[0215] Optionally, 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, and the distance Z between the terminal device and the j-th TN area among the M TN areas is... j The j-th TN region is the first TN region when the following conditions are met:

[0216] α×Z target ≤Z j ≤β×Z target ;

[0217] Among them, Z target Let j represent the first distance threshold, where j is a natural number from 0 to M-1.

[0218] Optionally, the timing for the terminal device to perform cell handover or cell reselection is determined based on the operating parameters of the terminal device and / or the satellites in the NTN system.

[0219] Optionally, the operating parameters include moving speed and motion trajectory. The motion trajectory of the terminal device and / or satellite is used to determine the distance between the terminal device and the first boundary. The first boundary includes one of the following: 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 location and radius of the TN area.

[0220] 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 time, where the first time period T is represented as:

[0221] T = min(t1, t2) - t;

[0222] Where t represents the time during which the terminal device performs cell handover or cell reselection;

[0223] D1 represents the distance between the terminal device and the first boundary that is closest in the direction of the terminal device's movement trajectory. u V represents the moving speed of the terminal device. t Indicates the satellite's speed of movement. V represents u With V t The angle between them;

[0224] D2 represents the distance between the terminal device and the first boundary that is closest to it in the vertical direction along the trajectory of the terminal device. Not zero.

[0225] Figure 11 This is a schematic block diagram of another device for wireless communication according to an embodiment of this application. The device 1100 can be any of the network devices described above. Figure 11 The device 1100 shown includes a transmitting unit 1110.

[0226] The transmitting unit 1110 can be used to transmit first information to the terminal device. The first information is used to determine one or more first TN areas related to the terminal device in the NTN cell. The one or more first TN areas are used by the terminal device to determine the target TN cell for cell handover 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; and geographical area information of each cell in the TN area corresponding to the NTN cell.

[0227] Optionally, the first information includes the second information and / or the third information, wherein the second information is carried in a broadcast message, the third information is carried in a dedicated signaling, and / or the third information is determined by the terminal device based on the measurement results.

[0228] Optionally, the first information includes second information and third information, where 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.

[0229] Optionally, when the third information is carried in dedicated signaling, the dedicated signaling may include RRC signaling or NAS signaling.

[0230] Optionally, the third information is carried in one of 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; and RRC recovery signaling received by the terminal device.

[0231] Optionally, the first information is carried in the broadcast message. The TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current time. The TN area corresponding to the NTN cell also includes the TN area covered by the NTN cell before the current time and / or the TN area covered after the current time.

[0232] Optionally, one or more first TN areas are determined based on the distance between the terminal device and multiple TN areas corresponding to the NTN cell.

[0233] Optionally, one or more first TN regions are further determined based on a first distance threshold and / or a coefficient associated with the first distance threshold.

[0234] Optionally, the coefficients of the first distance threshold include 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 j-th TN area among the M TN areas is... j The j-th TN region is the first TN region when the following conditions are met:

[0235] α×Z target ≤Z j ≤β×Z target ;

[0236] Among them, Z target Let j represent the first distance threshold, where j is a natural number from 0 to N-1.

[0237] Optionally, the timing for the terminal device to perform cell handover or cell reselection is determined based on the operating parameters of the terminal device and / or the satellites in the NTN system.

[0238] Optionally, the operating parameters include moving speed and motion trajectory. The motion trajectory of the terminal device and / or satellite is used to determine the distance between the terminal device and the first boundary. The first boundary includes one of the following: 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 location and radius of the TN area.

[0239] 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 time, where the first time period T is represented as:

[0240] T = min(t1, t2) - t;

[0241] Where t represents the time during which the terminal device performs cell handover or cell reselection;

[0242] D1 represents the distance between the terminal device and the first boundary that is closest in the direction of the terminal device's movement trajectory. u V represents the moving speed of the terminal device. t Indicates the satellite's speed of movement. V represents u With V t The angle between them;

[0243] D2 represents the distance between the terminal device and the first boundary that is closest to it in the vertical direction along the trajectory of the terminal device. Not zero.

[0244] Figure 12 The diagram shown is a schematic structural diagram of a communication device according to an embodiment of this application. Figure 12 The dashed lines indicate that the unit or module is optional. The device 1200 can be used to implement the methods described in the above method embodiments. The device 1200 can be a chip, a terminal device, or a network device.

[0245] Apparatus 1200 may include one or more processors 1210. The processor 1210 may support apparatus 1200 in implementing the methods described in the preceding method embodiments. 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 other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0246] The apparatus 1200 may further include one or more memories 1220. The memories 1220 store a program that can be executed by the processor 1210, causing the processor 1210 to perform the methods described in the preceding method embodiments. The memories 1220 may be independent of the processor 1210 or integrated within the processor 1210.

[0247] The device 1200 may also include a transceiver 1230. The processor 1210 can communicate with other devices or chips via the transceiver 1230. For example, the processor 1210 can send and receive data with other devices or chips via the transceiver 1230.

[0248] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal device or network device in the various embodiments of this application.

[0249] The computer-readable storage medium can be any available medium that a computer can read, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs), or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0250] This application also provides a computer program product. The computer program product includes a program. This computer program product can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0251] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as 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, all or part of the processes or functions described in the embodiments of this application are generated. 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. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0252] This application also provides a computer program. This computer program can be applied to a terminal device or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0253] In this application, the terms "system" and "network" are used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0254] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0255] In the embodiments of this application, the term "correspondence" may indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0256] In the embodiments of this application, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0257] In the embodiments of this application, the term "protocol" may refer to standard protocols in the field of communications, such as LTE protocols, NR protocols, and related protocols applied in future communication systems. This application does not limit the scope of these protocols.

[0258] In the embodiments of this application, determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0259] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0260] In the various embodiments of this application, the order of the above-mentioned processes does not imply 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 this application.

[0261] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0262] The units described as separate components may or may not be physically separate. 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 the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0263] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0264] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for wireless communication, comprising: Comprise: The terminal device determines one or more first terrestrial network TN areas related to the terminal device in a non-terrestrial network NTN cell according to first information, and the one or more first TN areas are used by the terminal device to determine a target TN cell for cell handover or cell reselection; Wherein, the first information comprises one or more of the following: Frequency information or a frequency list of a TN area corresponding to the NTN cell; Geographical area information of a TN area corresponding to the NTN cell; Geographical area information of each cell in a TN area corresponding to the NTN cell; The first information comprises second information and third information, the second information is related to a TN area corresponding to the NTN cell, and the third information is related to the first TN area, the second information is carried in a broadcast message, and the third information is carried in dedicated signaling and / or determined by the terminal device according to measurement results.

2. The method of claim 1, wherein, In the case that the third information is carried in dedicated signaling, the dedicated signaling comprises radio resource control RRC signaling or non-access stratum NAS signaling.

3. The method of claim 2, wherein, The third information is carried in one of the following dedicated signaling: RRC setup signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; Capability query signaling received by the terminal device; RRC resume signaling received by the terminal device.

4. The method of claim 1, wherein, In the case that the third information is determined by the terminal device according to measurement results, the measurement results comprise the transmission power of one or more network devices corresponding to the one or more first TN areas measured by the terminal device.

5. The method of claim 4, wherein, The target TN cell is further determined according to the relative distance between the one or more network devices corresponding to the one or more first TN areas and the terminal device, and / or the load condition of the one or more network devices corresponding to the one or more first TN areas.

6. The method of claim 5, wherein, Each of the one or more first TN areas corresponds to N network devices, N being a natural number greater than 1, the target TN cell being determined according to a first parameter of the N network devices corresponding to each of the first TN areas, the first parameter of an i-th network device in the N network devices is represented as: ； wherein, represents the transmit power of the i-th network device, i is a natural number from 0 to N-1, represents the distance between the terminal device and the center point of the i-th network device, represents the distance from the center point of the i-th network device to the edge of the service area, represents the load saturation of the i-th network device, with a value range of [0, 1].

7. The method according to any one of claims 1 to 6, characterized in that, The TN area corresponding to the NTN cell comprises a TN area currently covered by the NTN cell, and the TN area corresponding to the NTN cell further comprises a TN area covered by the NTN cell before the current time and / or a TN area covered by the NTN cell after the current time.

8. The method according to any one of claims 1-6, characterized in that, The one or more first TN areas are determined according to the distance between the terminal device and the plurality of TN areas corresponding to the NTN cell.

9. The method of claim 8, wherein, 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.

10. The method of claim 9, wherein, A coefficient of the first distance threshold includes a first coefficient a and a second coefficient β, the NTN cell corresponds to M TN areas, and a distance between the terminal device and a jth TN area in the M TN areas Z j The jth TN area is the first TN area when the following condition is met: α× Z target ≤ Z j ≤ β× Z target ； wherein Z target denotes a first distance threshold, j is a natural number from 0 to M-1.

11. The method according to any one of claims 1-6, characterized in that, The timing of the cell handover or the cell reselection performed by the terminal device is determined according to the operating parameters of the terminal device and / or a satellite in the NTN system.

12. The method of claim 11, wherein, The operating parameters comprise a moving speed and a motion trajectory, and the motion trajectory of the terminal device and / or the satellite is used to determine the distance between the terminal device and a first boundary, and the first boundary comprises one of the following boundaries: An edge of the NTN cell; A boundary between the NTN cell and a TN area corresponding to the NTN cell, and the geographical area information of the TN area is represented by a center position and a radius of the TN area.

13. The method of claim 12, wherein, The terminal device performs the cell switching or the cell reselection at a time point represented by a first time period T from a current time point, and the first time period T is represented as: T = min(t1, t2) - t; wherein t represents a time at which the terminal device performs the cell switching or the cell reselection. , denotes a distance between the terminal device and a first border closest in direction along a movement trajectory of the terminal device, denotes a movement speed of the terminal device, denotes a movement speed of the satellite, denotes an angle between ; , denotes the distance between the terminal device and the first border closest in the perpendicular direction to the movement trajectory of the terminal device, and sin∂ is not 0.

14. A method for wireless communication, comprising: The network device sends first information to the terminal device, and 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 the terminal device to perform cell switching or cell reselection. The first information includes one or more of the following: frequency information or a frequency list of a 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; 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, the second information is carried in a broadcast message, and the third information is carried in dedicated signaling and / or determined by the terminal device according to measurement results. In the case that the third information is carried in dedicated signaling, the dedicated signaling includes radio resource control (RRC) signaling or non-access stratum (NAS) signaling.

15. The method of claim 14, wherein, The third information is carried in one of the following dedicated signaling:

16. The method of claim 15, wherein, RRC setup signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; capability query signaling received by the terminal device; RRC resume signaling received by the terminal device. The TN area corresponding to the NTN cell includes a TN area currently covered by the NTN cell, and the TN area corresponding to the NTN cell also includes a TN area covered by the NTN cell before the current time point and / or a TN area covered by the NTN cell after the current time point.

17. The method according to any one of claims 14-16, characterized by, The one or more first TN areas are determined according to distances between the terminal device and a plurality of TN areas corresponding to the NTN cell.

18. The method of any one of claims 14-16, wherein, The one or more first TN areas are also determined according to a first distance threshold and / or a coefficient related to the first distance threshold.

19. The method of claim 18, wherein, The time point at which the terminal device performs the cell switching or the cell reselection is determined according to operating parameters of the terminal device and / or a satellite in the NTN system.

20. The method of claim 19, wherein, A coefficient of the first distance threshold includes a first coefficient a and a second coefficient β, the NTN cell corresponds to M TN areas, and a distance between the terminal device and a jth TN area in the M TN areas Z j The jth TN area is the first TN area when the following condition is met: α× Z target ≤ Z j ≤ β× Z target ； wherein Z target denotes a first distance threshold, j is a natural number from 0 to M-1.

21. The method of any one of claims 14-16, wherein, The operating parameters include a moving speed and a motion trajectory, and the motion trajectory of the terminal device and / or the satellite is used to determine a distance between the terminal device and a first boundary, and the first boundary includes one of the following boundaries:

22. The method of claim 21, wherein, an edge of the NTN cell; a boundary between the NTN cell and a TN area corresponding to the NTN cell, and the geographical area information of the TN area is represented by a center position and a radius of the TN area. The terminal device performs the cell switching or the cell reselection at a time point represented by a first time period T from a current time point, and the first time period T is represented as:

23. The method of claim 22, wherein, ​ T = min(t1, t2) - t; Where t represents the time during which the terminal device performs cell handover or cell reselection; , denotes a distance between the terminal device and a first border closest in direction along a movement trajectory of the terminal device, denotes a movement speed of the terminal device, denotes a movement speed of the satellite, denotes an angle between ; , This represents the distance between the terminal device and the first boundary that is closest to it in the vertical direction along the movement trajectory of the terminal device, where sin∂ is not 0.

24. An apparatus for wireless communication, the apparatus comprising: The device is a terminal device, and the terminal device includes: The determining unit is configured to determine one or more first terrestrial network TN areas related to the terminal device in a non-terrestrial network NTN cell based on first information, wherein the one or more first TN areas are used by the terminal device to determine the target TN cell for cell handover or cell reselection. The first information includes one or more of the following: The frequency information or frequency list of the TN area corresponding to the NTN cell; Geographic 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; 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. The second information is carried in a broadcast message, and the third information is carried in dedicated signaling and / or the third information is determined by the terminal device based on the measurement results.

25. The apparatus of claim 24, wherein, When the third information is carried in dedicated signaling, the dedicated signaling includes Radio Resource Control (RRC) signaling or Non-Access Stratum (NAS) signaling.

26. The apparatus of claim 25, wherein, The third information is carried in the following dedicated signaling: The terminal device receives the RRC establishment signaling; The terminal device receives the RRC connection reconfiguration signaling; The terminal device receives a capability query signaling; The terminal device receives the RRC recovery signaling.

27. The apparatus of claim 24, wherein, When the third information is determined by the terminal device based on the measurement results, the measurement results include the transmit power of one or more network devices corresponding to the first TN area as measured by the terminal device.

28. The apparatus of claim 27, wherein, The target TN cell is also determined based on the relative distance between the terminal device and the multiple network devices corresponding to the one or more first TN areas, and / or the load status of the multiple network devices corresponding to the one or more first TN areas.

29. The apparatus of claim 28, wherein, Each of the one or more first TN areas corresponds to N network devices, N being a natural number greater than 1, the target TN cell being determined according to a first parameter of the N network devices corresponding to each of the first TN areas, the first parameter of an i-th network device in the N network devices is represented as: ； wherein, represents the transmit power of the i-th network device, i is a natural number from 0 to N-1, represents the distance between the terminal device and the center point of the i-th network device, represents the distance from the center point of the i-th network device to the edge of the service area, represents the load saturation of the i-th network device, with a value range of [0, 1].

30. The apparatus of any one of claims 24-29, wherein, The TN area corresponding to the NTN cell includes the TN area covered by the NTN cell at the current time, and also includes the TN area covered by the NTN cell before the current time and / or the TN area covered after the current time.

31. The apparatus of any one of claims 24-29, wherein, The one or more first TN regions are determined based on the distance between the terminal device and the multiple TN regions corresponding to the NTN cell.

32. The apparatus of claim 31, wherein, The one or more first TN regions are further determined based on a first distance threshold and / or a coefficient related to the first distance threshold.

33. The apparatus of claim 32, wherein, A coefficient of the first distance threshold includes a first coefficient a and a second coefficient β, the NTN cell corresponds to M TN areas, and a distance between the terminal device and a jth TN area in the M TN areas Z j The jth TN area is the first TN area when the following condition is met: α× Z target ≤ Z j ≤ β× Z target ； wherein Z target denotes a first distance threshold, j is a natural number from 0 to M-1.

34. The apparatus of any one of claims 24-29, wherein, The timing for the terminal device to perform cell handover or cell reselection is determined based on the operating parameters of the terminal device and / or the satellites in the NTN system.

35. The apparatus of claim 34, wherein, The operating parameters include movement speed and trajectory. The trajectory of the terminal device and / or the satellite is used to determine the distance between the terminal device and a first boundary, which includes one of the following: The edge of the NTN cell; A boundary between the NTN cell and a TN area corresponding to the NTN cell, geographical area information of the TN area being represented by a center position and a radius of the TN area.

36. The device of claim 35, wherein, A timing at which the terminal device performs the cell switching or the cell reselection is represented by a first time period T from a current time, the first time period T being represented as: T = min(t1, t2) - t; wherein t represents a time at which the terminal device performs the cell switching or the cell reselection. , denotes a distance between the terminal device and a first border closest in direction along a movement trajectory of the terminal device, denotes a movement speed of the terminal device, denotes a movement speed of the satellite, denotes an angle between ; , denotes the distance between the terminal device and the first border closest in the perpendicular direction to the movement trajectory of the terminal device, and sin∂ is not 0.

37. A device for wireless communication, characterized in that, The apparatus is a network device, and the network device comprises: a sending unit configured to send, to a terminal device, first information used to determine one or more first terrestrial network (TN) areas related to the terminal device in a non-terrestrial network (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 comprises one or more of: frequency information or a frequency list of a 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; the first information comprises second information related to the TN area corresponding to the NTN cell and third information related to the first TN area, the second information being carried in a broadcast message, and the third information being carried in dedicated signaling and / or determined by the terminal device according to measurement results.

38. The device of claim 37, wherein, In a case where the third information is carried in dedicated signaling, the dedicated signaling comprises radio resource control (RRC) signaling or non-access stratum (NAS) signaling.

39. The device of claim 38, wherein, The third information is carried in one of the following dedicated signaling: RRC setup signaling received by the terminal device; RRC connection reconfiguration signaling received by the terminal device; capability query signaling received by the terminal device; RRC resume signaling received by the terminal device.

40. The device of any one of claims 37-39, wherein, The TN area corresponding to the NTN cell comprises a TN area currently covered by the NTN cell, and the TN area corresponding to the NTN cell further comprises a TN area covered by the NTN cell before a current time and / or a TN area covered by the NTN cell after the current time.

41. The device of any one of claims 37-39, wherein, The one or more first TN areas are determined according to distances between the terminal device and a plurality of TN areas corresponding to the NTN cell.

42. The device of claim 41, wherein, 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.

43. The device of claim 42, wherein, A coefficient of the first distance threshold includes a first coefficient a and a second coefficient β, the NTN region corresponds to M TN regions, and a distance between the terminal device and a jth TN region in the M TN regions Z j The jth TN cell is the first TN region when the following conditions are met: α× Z target ≤ Z j ≤ β× Z target ； wherein Z target denotes a first distance threshold, j is a natural number from 0 to M-1.

44. The device of any one of claims 37-39, wherein, The timing at which the terminal device performs the cell switching or the cell reselection is determined according to operating parameters of the terminal device and / or a satellite in the NTN system.

45. The device of claim 44, wherein, The operating parameters comprise a moving speed and a motion trajectory, and the motion trajectory of the terminal device and / or the satellite is used to determine a distance between the terminal device and a first boundary, the first boundary comprising one of the following boundaries: an edge of the NTN cell; A boundary between the NTN cell and a TN area corresponding to the NTN cell, geographical area information of the TN area being represented by a center position and a radius of the TN area.

46. The device of claim 45, wherein, A timing at which the terminal device performs the cell switching or the cell reselection is represented by a first time period T from a current time, the first time period T being represented as: T = min(t1, t2) - t; where t represents a time at which the terminal device performs the cell switching or the cell reselection. , denotes a distance between the terminal device and a first border closest in direction along a movement trajectory of the terminal device, denotes a movement speed of the terminal device, denotes a movement speed of the satellite, denotes an angle between ; , denotes the distance between the terminal device and the first border closest in the perpendicular direction to the movement trajectory of the terminal device, and sin∂ is not 0.

47. A communications device, characterized by A chip comprising a processor configured to invoke a program from a memory to perform the method of any one of claims 1-23.

48. A communications device, characterized by A chip comprising a processor configured to invoke a program from a memory to perform the method of any one of claims 1-23.

49. A chip, comprising: A chip comprising a processor configured to invoke a program from a memory to cause a device in which the chip is installed to perform the method of any one of claims 1-23.

50. A computer-readable storage medium, comprising: A computer program product having stored thereon a program causing a computer to perform the method of any one of claims 1-23.

51. A computer program product, characterised in that, A computer program product having stored thereon a program causing a computer to perform the method of any one of claims 1-23.

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