Wireless communication method, terminal device and network device

Abstract

The invention provides a wireless communication method, terminal equipment and network equipment. The method comprises: a first terminal device receiving first information sent by a network device, the first information comprising one or more of the following: first cell prohibition information used for indicating whether a first cell allows access of a first type of terminal devices; the second cell forbidding information is used for indicating whether the first cell allows the second type of terminal equipment to access or not; satellite identification information of the first cell; the first indication information is used for indicating the first terminal equipment to be switched from the user plane optimization mode to the control plane optimization mode; wherein the first type of terminal equipment and the second type of terminal equipment are terminal equipment with NTN capability, and the NTN capability of the first type of terminal equipment and the NTN capability of the second type of terminal equipment are not completely the same, so that the possibility of successful communication of the terminal equipment can be improved.

Description

Wireless communication method, terminal device and network device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a wireless communication method, terminal equipment, and network equipment. Background Art

[0002] With technological advancements, various satellite operating modes have been introduced in non-terrestrial network (NTN) communication scenarios, such as the transparent forwarding mode and store-and-forward mode described above. However, due to limited information about NTN communication scenarios, connected terminal devices may experience difficulties with NTN communication, or even be unable to communicate in connected NTN communication scenarios.

[0003] Summary of the Invention

[0004] The present application provides a wireless communication method, terminal device, and network device. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for wireless communication is provided, including: a first terminal device receives first information sent by a network device, the first information including one or more of the following: first cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; second cell prohibition information, used to indicate whether the first cell allows a second type of terminal device to access; satellite identification information of the first cell; and first indication information, used to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; wherein the first type of terminal device and the second type of terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first type of terminal device and the second type of terminal device are not completely the same.

[0006] In a second aspect, a method for wireless communication is provided, including: a network device sending first information, the first information including one or more of the following: first cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; second cell prohibition information, used to indicate whether the first cell allows a second type of terminal device to access; satellite identification information of the first cell; and first indication information, used to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; wherein the first type of terminal device and the second type of terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first type of terminal device and the second type of terminal device are not exactly the same.

[0007] According to a third aspect, a terminal device is provided, which is a first terminal device and includes: a receiving unit for receiving first information sent by a network device, the first information including one or more of the following: first cell prohibition information for indicating whether the first cell allows first-type terminal devices to access; second cell prohibition information for indicating whether the first cell allows second-type terminal devices to access; satellite identification information of the first cell; and first indication information for instructing the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; wherein the first-type terminal device and the second-type terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first-type terminal device and the second-type terminal device are not completely the same.

[0008] In a fourth aspect, a network device is provided, including: a sending unit, configured to send first information, the first information including one or more of the following: first cell prohibition information, configured to indicate whether the first cell allows a first type of terminal device to access; second cell prohibition information, configured to indicate whether the first cell allows a second type of terminal device to access; satellite identification information of the first cell; and first indication information, configured to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; wherein the first type of terminal device and the second type of terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first type of terminal device and the second type of terminal device are not exactly the same.

[0009] In a fifth aspect, a terminal device is provided, comprising a processor, a memory, and a communication interface, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0010] In a sixth aspect, a network device is provided, comprising a processor, a memory, and a transceiver, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the network device executes part or all of the steps in the method of the second aspect.

[0011] In a seventh aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device or network device in the solution provided in the embodiment of the present application.

[0012] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a communication device (for example, a terminal device or a network device) to execute part or all of the steps in the methods of the above aspects.

[0013] In a ninth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a communication device (e.g., a terminal device or a network device) to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product can be a software installation package.

[0014] In the tenth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0015] In an embodiment of the present application, the network device can send first information associated with NTN communication to the first terminal device. Accordingly, the first terminal device can perform subsequent communication processes based on the first information. Compared with the traditional solution, the terminal device communicates according to the preconfigured communication method, which helps to increase the possibility of successful communication of the terminal device. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a system architecture diagram of a communication system to which an embodiment of the present application can be applied.

[0017] FIG2 is a schematic diagram of a satellite network architecture applicable to an embodiment of the present application.

[0018] FIG3 is a schematic diagram of another satellite network architecture applicable to an embodiment of the present application.

[0019] FIG4 is a schematic diagram of another satellite network architecture applicable to an embodiment of the present application.

[0020] FIG5 is a schematic diagram of the communication process when the satellite operates in the normal mode.

[0021] FIG6 is a schematic diagram of the communication process when the satellite operates in the store-and-forward mode.

[0022] FIG7 is a schematic flowchart of a wireless communication method according to an embodiment of the present application.

[0023] FIG8 is a schematic flowchart of the wireless communication method according to Embodiment 1 of the present application.

[0024] Figure 9 is a schematic flowchart of the wireless communication method of embodiment 2 of the present application.

[0025] Figure 10 is a schematic flowchart of the wireless communication method of Example 3 of the present application.

[0026] FIG11 is a schematic diagram of a terminal device according to an embodiment of the present application.

[0027] FIG12 is a schematic diagram of a network device according to an embodiment of the present application.

[0028] FIG13 is a schematic structural diagram of a communication device according to an embodiment of the present application. DETAILED DESCRIPTION

[0029] The following will describe the technical solutions in the embodiments of this application in conjunction with the drawings in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. With respect to the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0030] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: global system of mobile communication (GSM) system, code division multiple access (CDMA) system, wideband code division multiple access (WCDMA) system, general packet radio service (GPRS), long term evolution (LTE) system, advanced long term evolution (LTE-A) system, new radio (NR) system, evolution system of NR system, LTE-based access to unlicensed spectrum (LTE-U) system on unlicensed spectrum, NR-based access to unlicensed spectrum (NR-U) system on unlicensed spectrum, NTN system, universal mobile telecommunication system (UMTS), wireless local area networks (WLAN), wireless fidelity (WLAN), etc. fidelity, WiFi), fifth-generation communication (5G) systems or other communication systems, such as future communication systems, such as sixth-generation mobile communication systems, and satellite communication systems.

[0031] Generally speaking, traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, mobile communication systems will not only support traditional communications, but will also support, for example, device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), vehicle-to-vehicle (V2V) communication, or vehicle-to-everything (V2X) communication, etc. The embodiments of the present application can also be applied to these communication systems.

[0032] The communication system in the embodiment of the present application can be applied to a carrier aggregation (CA) scenario, a dual connectivity (DC) scenario, and a standalone (SA) networking scenario.

[0033] The communication system in the embodiment of the present application can be applied to an unlicensed spectrum, where the unlicensed spectrum can also be considered as a shared spectrum; or, the communication system in the embodiment of the present application can also be applied to an authorized spectrum, where the authorized spectrum can also be considered as a dedicated spectrum.

[0034] The embodiments of the present application can be applied to NTN systems as well as terrestrial networks (TN) systems. As an example and not a limitation, NTN systems include NR-based NTN systems and IoT-based NTN systems.

[0035] The embodiments of the present application describe various embodiments in conjunction with network devices and terminal devices, where the terminal device 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 device, user agent or user device, etc.

[0036] In an embodiment of the present application, the terminal device may be a station (STATION, ST) in a WLAN, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a next-generation communication system such as a terminal device in an NR network, or a terminal device in a future-evolved public land mobile network (PLMN) network, etc.

[0037] In an embodiment of the present application, a terminal device may be a device that provides voice and / or data connectivity to a user and can be used to connect people, objects, and machines, such as a handheld device with wireless connection capabilities, an in-vehicle device, etc. The terminal device in the embodiment of the present application may be a mobile phone, a tablet computer, a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Optionally, a UE may be used to act as a base station. For example, a UE may act as a scheduling entity that provides sidelink signals between UEs in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. Cellular phones and smart home devices communicate with each other without relaying the communication signal through a base station.

[0038] In an embodiment of the present application, the terminal device can be deployed on land, including indoors or outdoors, handheld, wearable or vehicle-mounted; it can also be deployed on the water surface (such as ships, etc.); it can also be deployed in the air (such as airplanes, balloons and satellites, etc.).

[0039] In the embodiment of the present application, the terminal device can be a mobile phone, a tablet computer, a computer with wireless transceiver function, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in a smart grid, a wireless terminal device in transportation safety, a wireless terminal device in a smart city, or a wireless terminal device in a smart home, etc. Of course, in the embodiment of the present application, the terminal device can also be an NB-IoT terminal or an LTE-based enhanced MTO (eMTC) terminal. The terminal device involved in the embodiment of the present application can also be called a terminal, user equipment (UE), access terminal equipment, vehicle-mounted terminal, industrial control terminal, UE unit, UE station, mobile station, mobile station, remote station, remote terminal equipment, mobile device, UE terminal equipment, wireless communication equipment, UE agent or UE device, etc. Terminal devices can also be fixed or mobile.

[0040] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0041] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and 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. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly cover various names as follows, or be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, secondary station SeNB, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station may also refer to a communication module, modem or chip provided in the aforementioned device or apparatus. The base station may also be a mobile switching center and a device-to-device D2D, vehicle-to-everything (V2X), machine-to-machine (M2M) communication device that performs the base station function, a network side device in a 6G network, a device that performs the base station function in a future communication system, etc. The base station may support networks with the same or different access technologies. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network equipment.

[0042] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0043] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device may include a CU and a DU. The gNB may also include an AAU.

[0044] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0045] As an example and not a limitation, in an embodiment of the present application, the network device may have a mobile feature, for example, the network device may be a mobile device. In some embodiments of the present application, the network device may be a satellite or a balloon station. For example, the satellite may be a low earth orbit (LEO) satellite, a medium earth orbit (MEO) satellite, a geostationary earth orbit (GEO) satellite, a high elliptical orbit (HEO) satellite, etc. In some embodiments of the present application, the network device may also be a base station set up in a location such as land or water.

[0046] In an embodiment of the present application, the network device can provide services for a cell, and the terminal device communicates with the network device through the transmission resources used by the cell (for example, frequency domain resources, or spectrum resources). The cell can be a cell corresponding to the network device (for example, a base station). The cell can belong to a macro base station or a base station corresponding to a small cell. The small cells here may include: metro cells, micro cells, pico cells, femto cells, etc. These small cells have the characteristics of small coverage and low transmission power, and are suitable for providing high-speed data transmission services.

[0047] For example, Figure 1A is a schematic diagram of the architecture of a communication system provided in an embodiment of the present application. As shown in Figure 1A, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or also referred to as a communication terminal or terminal). The network device 110 may provide communication coverage for a specific geographic area and may communicate with terminal devices located within the coverage area.

[0048] Figure 1A exemplarily shows a network device and two terminal devices. In some embodiments of the present application, the communication system 100 may include multiple network devices and each network device may include other number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0049] For example, FIG1B is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Referring to FIG1B , a terminal device 1101 and a satellite 1102 are included, and wireless communication can be performed between the terminal device 1101 and the satellite 1102. The network formed between the terminal device 1101 and the satellite 1102 can also be referred to as an NTN. In the architecture of the communication system shown in FIG1B , the satellite 1102 can have the function of a base station, and the terminal device 1101 and the satellite 1102 can communicate directly. In the system architecture, the satellite 1102 can be referred to as a network device. In some embodiments of the present application, a plurality of network devices 1102 may be included in the communication system, and each network device 1102 may include other number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0050] For example, FIG1C is a schematic diagram of the architecture of another communication system provided in an embodiment of the present application. Referring to FIG1C , it includes a terminal device 1201, a satellite 1202, and a base station 1203. Wireless communication can be performed between the terminal device 1201 and the satellite 1202, and communication can be performed between the satellite 1202 and the base station 1203. The network formed between the terminal device 1201, the satellite 1202, and the base station 1203 can also be referred to as an NTN. In the architecture of the communication system shown in FIG1C , the satellite 1202 may not have the function of a base station, and the communication between the terminal device 1201 and the base station 1203 needs to be transferred through the satellite 1202. In this system architecture, the base station 1203 can be referred to as a network device. In some embodiments of the present application, a plurality of network devices 1203 may be included in the communication system, and each network device 1203 may include other number of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0051] It should be noted that Figures 1A-1C are only examples of the system to which this application is applicable. Of course, the method shown in the embodiment of this application can also be applied to other systems, such as 5G communication systems, LTE communication systems, etc., and the embodiment of this application does not make specific limitations on this.

[0052] In some embodiments of the present application, the wireless communication system shown in Figures 1A-1C may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but the embodiments of the present application are not limited to this.

[0053] It should be understood that in the embodiments of the present application, a device having a communication function in a network / system may be referred to as a communication device. Taking the communication system 100 shown in FIG1A as an example, the communication device may include a network device 110 and a terminal device 120 having a communication function. The network device 110 and the terminal device 120 may be the specific devices described above and will not be described in detail here. The communication device may also include other devices in the communication system 100, such as a network controller, a mobility management entity, and other network entities, which are not limited in the embodiments of the present application.

[0054] It should be understood that the "indication" mentioned in the embodiments of this application can be a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" can mean that A directly indicates B, for example, B can be obtained through A; it can also mean that A indirectly indicates B, for example, A indicates C, and B can be obtained through C; it can also mean that there is an association between A and B.

[0055] In the description of the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and being indicated, configuration and being configured, etc.

[0056] The “configuration” in the embodiment of the present application may include configuration through at least one of system messages, radio resource control (RRC) signaling and media access control element (MAC CE).

[0057] In some embodiments of the present application, "predefined" or "preset" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device or a network device). This application does not limit the specific implementation method. For example, predefined may refer to information defined in a protocol.

[0058] In some embodiments of the present application, the "protocol" may refer to a standard protocol in the field of communications, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and this application does not limit this.

[0059] For ease of understanding, some relevant technical knowledge involved in the embodiments of this application is first introduced. The following related technologies can be combined with the technical solutions of the embodiments of this application as optional solutions, and they all fall within the scope of protection of the embodiments of this application. The embodiments of this application include at least part of the following contents.

[0060] Radio resource control (RRC) state and mobility management

[0061] Currently, the protocol defines three RRC states of terminal devices: RRC connected (RRC_connected) state, RRC idle (RRC-idle) state and RRC inactive (RRC-inactive) state.

[0062] The RRC connection state may refer to the state in which the terminal device is in when the RRC release is not performed after the random access process is completed. An RRC connection exists between the terminal device and a network device (e.g., an access network device). In the RRC connection state, the terminal device can transmit data with the network device, such as downlink data transmission and / or uplink data transmission. Alternatively, the terminal device can also transmit terminal device-specific data channels and / or control channels with the network device to transmit specific information or unicast information of the terminal device.

[0063] In the RRC connected state, the network device can determine the cell-level location information of the terminal device, that is, the network device can determine the cell to which the terminal device belongs. In the RRC connected state, after the terminal device moves, such as from one cell to another, the network device can control the terminal device to perform cell handover. Therefore, it can be seen that the mobility management of the terminal device in the RRC connected state may include cell handover. In addition, the mobility management of the terminal device in the RRC connected state can be controlled by the network device. Accordingly, the terminal device can switch to a designated cell according to the instructions issued by the network device.

[0064] The RRC idle state refers to the state of the terminal device when it is resident in a cell but is not performing random access. The terminal device usually enters the RRC idle state after being powered on or after RRC is released. In the RRC idle state, there is no RRC connection between the terminal device and the network device (such as the resident network device), the network device does not store the context of the terminal device, and no connection is established between the network device and the core network for the terminal device. If the terminal device needs to enter the RRC connected state from the RRC idle state, it is necessary to initiate the RRC connection establishment process.

[0065] In the RRC idle state, the core network (CN) can send a paging message to the terminal device, that is, the paging process can be triggered by the CN. Optionally, the paging area can also be configured by the CN. In some cases, for a terminal device in the RRC idle state, when the terminal device moves (for example, from one cell to another), the terminal device can initiate a cell reselection process. In other cases, for a terminal device in the RRC idle state, when the terminal device needs to access a cell, the terminal device can initiate a cell selection process. That is, the mobility management of the terminal device in the RRC idle state may include cell reselection and / or cell selection.

[0066] The RRC inactive state is defined to reduce air interface signaling, quickly restore wireless connections, and quickly resume data services. The RRC inactive state is a state between the connected and idle states. A terminal device previously entered the RRC connected state and then released the RRC connection with the network device, but the network device retained the terminal device's context. Furthermore, the connection established between the network device and the core network for the terminal device is not released. This means that the user plane and control plane bearers between the RAN and CN are still maintained, indicating a CN-NR connection.

[0067] In the RRC inactive state, the RAN can send a paging message to the terminal device, that is, the paging process can be triggered by the RAN. The RAN-based paging area is managed by the RAN, and the network equipment can know the location of the terminal device based on the RAN paging area level.

[0068] NTN

[0069] The Third Generation Partnership Project (3GPP) is currently researching NTN technology. NTN typically uses satellite communications to provide communication services to terrestrial users. Compared to terrestrial cellular networks, satellite communications offer many unique advantages.

[0070] First, satellite communications are not restricted by user geography. For example, conventional terrestrial communication networks cannot cover areas where network equipment cannot be deployed, such as oceans, mountains, and deserts. Similarly, terrestrial communication networks do not cover certain sparsely populated areas. However, because satellite communications can cover a large ground area and orbit the Earth, theoretically, every corner of the Earth can be covered by a satellite communication network.

[0071] Secondly, satellite communications have significant social value. They can provide low-cost coverage to remote, mountainous areas and impoverished countries and regions, enabling people in these areas to enjoy advanced voice communications and mobile internet technologies. From this perspective, satellite communications help narrow the digital divide with developed regions and promote their development.

[0072] Again, satellite communication has the advantage of long distance, and the increase in communication distance does not significantly increase the cost of communication.

[0073] Finally, satellite communications are highly stable and not affected by natural disasters.

[0074] Communication satellites are classified according to their orbital altitude into low Earth orbit (LEO), medium Earth orbit (MEO), geostationary Earth orbit (GEO), and high elliptical orbit (HEO). Currently, research focuses on LEO and GEO satellites.

[0075] LEO satellites typically operate at altitudes between 500 and 1500 km. Accordingly, their orbital period is approximately 1.5 to 2 hours. For LEO satellites, the signal propagation delay for single-hop communication between users is typically less than 20 milliseconds. The maximum satellite visibility time for LEO satellites is approximately 20 minutes. LEO satellites offer advantages such as short signal propagation distances, low link loss, and low transmit power requirements for user devices.

[0076] GEO satellites orbit at an altitude of 35,786 km. They orbit the Earth every 24 hours. For GEO satellites, the signal propagation delay for single-hop communication between users is typically about 250 milliseconds.

[0077] To ensure satellite coverage and increase the capacity of the entire satellite communication system, satellites typically use multiple beams to cover the ground. Therefore, a single satellite can form dozens or even hundreds of beams to cover the ground. A single satellite beam can cover a ground area with a diameter of tens to hundreds of kilometers.

[0078] Currently, the NTN system includes the NR-NTN system and the Internet of Things (IoT)-NTN system.

[0079] Satellite network architecture

[0080] Currently, 3GPP is considering two types of satellites: those with transparent payloads and those with regenerative payloads. The following describes the network architectures for satellites with transparent payloads and those with regenerative payloads, respectively, using Figures 2 through 4.

[0081] In the satellite network architecture shown in Figures 2 to 4, the satellite network architecture may include a terminal device 210, a satellite node 222, and a ground receiving station 221 (referred to as a "ground station"). Wireless communication exists between the terminal device 210 and the satellite node 222. The terminal device 210 can send data to the satellite node 222 via the link between the terminal device 210 and the satellite node 222. For example, data can be sent to the satellite node 222 via a service link. Accordingly, after receiving the data, the satellite node 222 can send the data to the ground receiving station 221 via the link between the satellite node 222 and the ground receiving station 221. For example, the data can be transmitted to the ground receiving station 221 via a wireless link (such as a feeder link). Accordingly, after receiving the data from the satellite node 222, the ground receiving station 221 transmits the data to the core network (data network), which then processes the data via the core network, such as for data exchange with other terminals. It can be understood that the service link here refers to the link between the terminal device 210 and the satellite node 222, and the feeder link refers to the link between the satellite node 222 and the ground receiving station 221. In other possible embodiments, the link between the terminal device and the satellite node, and / or the link between the satellite node and the ground receiving station can also be expressed by other terms, which are not limited in this application.

[0082] The above-mentioned satellite nodes 222 can be divided into three types. The first type of satellite node is only used for forwarding, that is, it only has a transparent forwarding function. In some implementations, such satellite nodes may only provide one or more of a radio frequency filtering function, a frequency conversion function, and a power amplification function. For this type of satellite node, the received terminal device signal is amplified and then sent to the ground receiving station without any processing on the satellite node, as shown in Figure 2; wherein, the terminal device and the satellite node can communicate through the NR-Uu interface, the satellite node and the ground receiving station (such as the NTN radio frequency remote unit (RRU) and gNB) can communicate through the NR-Uu interface, the ground receiving station and the 5G core network (5G CN) can communicate through the N1 / 2 / 3 interface, and the 5G CN and the data network can communicate through the N6 interface.

[0083] The second type of satellite node has complete base station processing functions. The satellite node is a base station for the terminal equipment on the ground. The communication between the satellite node and the terminal equipment is basically the same as normal 5G communication, as shown in Figure 3. In some implementations, such satellite nodes can also provide one or more of the following functions: demodulation function, decoding function, routing function, conversion function, encoding function, and modulation function. Among them, the terminal equipment and the satellite node can communicate through the NR-Uu interface, and the satellite node and the ground receiving station can communicate through the satellite radio interface (SRI). The SRI interface can be used to send interface messages between the satellite node and the 5G CN (such as N2 / N3 interface messages). The ground receiving station and the 5G CN can communicate through the N1 / 2 / 3 interface, and the 5G CN and the data network can communicate through the N6 interface.

[0084] The third type of satellite node has DU processing capabilities. To ground-based terminal devices, the satellite node appears as a DU. Communication between the satellite node and terminal devices is essentially the same as that between terminal devices and DUs in a normal 5G terrestrial communication system, as shown in Figure 4. Terminal devices and satellite nodes can communicate via the NR-Uu interface, while satellite nodes and ground receiving stations (such as gNB-CUs) can communicate via the SRI interface, which transmits F1 interface messages between the satellite and ground receiving stations. Ground receiving stations and 5G CNs can communicate via the N1 / 2 / 3 interfaces, and the 5G CN and data networks can communicate via the N6 interface.

[0085] Store-and-forward (SF) mode

[0086] Currently, 3GPP is considering supporting satellites operating in store-and-forward mode. This mode operates when the service link between satellite users and the feeder link between the satellite and the ground gateway in an NTN network are not both available at the same time. Therefore, the satellite must store transmitted data when one link is connected and forward it when the other link is connected. This reduces the cost of ground gateway deployment and increases deployment flexibility, eliminating the need to deploy ground gateways close to users. This mode is suitable for services that are less sensitive to latency or have less stringent latency requirements.

[0087] For ease of understanding, the following describes the communication process of the satellite operating in the normal mode and the store-and-forward mode respectively with reference to FIG5 and FIG6 .

[0088] As shown in Figure 5, when the satellite operates in normal mode, when the terminal device exchanges signaling or data with the ground receiving station through the satellite, the service link and the feeder link are required to be available at the same time, so the end-to-end connection between the terminal device and the ground receiving station through the satellite is continuous.

[0089] As shown in FIG6 , the satellite operates in a store-and-forward mode, the service link and the feeder link cannot be available at the same time, and the signaling / data interaction between the terminal device and the ground receiving station via the satellite may include steps 1 and 2.

[0090] In step 1, signaling and data are exchanged between the terminal device and the satellite via a service link. At this point, there is no feeder link established between the satellite and the ground receiving station, and the satellite stores the data to be transmitted. Subsequently, as the satellite moves away from the terminal device, the service link between the satellite and the terminal device is disconnected.

[0091] In step 2, when the satellite flies over the ground receiving station, the satellite establishes a connection with the ground receiving station. In this way, the satellite and the ground receiving station can communicate through the feeder link. At this time, the satellite can send the stored data to be transmitted to the ground receiving station through the feeder link.

[0092] It should be noted that the above description, in conjunction with steps 1 and 2, describes the process of transmitting the data to be transmitted from the terminal device to the ground receiving station via satellite. Correspondingly, the process of transmitting the data to be transmitted from the ground receiving station to the terminal device via satellite is similar and will not be repeated for the sake of brevity.

[0093] Cell barred mechanism

[0094] In some communication systems (e.g., LTE systems), system messages broadcast by network devices (e.g., system information block (SIB) 1) carry cell barring information 1 (also known as "cellBarred"), which indicates whether access to the current cell is permitted. In other communication systems (e.g., NTN systems), system messages broadcast by network devices (e.g., SIB1) carry cell barring information 2 (also known as "cellBarredNTN"). Cell barring information 2 implicitly indicates the network type of the cell, i.e., cell barring information 2 indicates whether the cell is available for NTN connections. Accordingly, when performing cell selection, an NTN-capable terminal device (NTN-capable UE) can first obtain SIB1 and then determine whether the corresponding cell supports NTN connections based on the cell barring information 2 in SIB1. If the cell barring information 2 indicates barred or SIB1 does not contain the cell barring information 2, the NTN-capable terminal device can assume that the cell is in a barred state.

[0095] Based on control plane optimization mode and user plane optimization mode

[0096] Generally, narrowband Internet of Things (NB-IoT) communications have the following characteristics: (1) The total data traffic of the NB-IoT user plane is relatively small; (2) The number of NB-IoT terminals in a single cell is large, and the number of control plane establishment and release times is high; (3) In order to send and receive a small amount of data, the network signaling overhead consumed by the terminal from the idle state to the connected state is much greater than the data payload itself. Based on the above characteristics, NB-IoT has enhanced and optimized the control plane (CP) and user plane (UP) at the system architecture level, which are introduced below.

[0097] As for the control plane optimization mode, also known as "CIoT EPS control plane function optimization (Control Plane CIoT EPS optimisation)", referred to as "CP solution", it is introduced for more efficient transmission of CIoT small data packet services. The core content of the control plane optimization mode is that user data can be transmitted through the control plane without establishing an air interface DRB bearer. In the control plane optimization mode, the user data and NAS layer signaling of the terminal device can be sent to the MME together, and forwarded by the MME to the S / P-GW or SCEF. When transmitting data based on the control plane optimization mode, there is no need to start the security function between the terminal device and the network device, and the security of the air interface data transmission can be the responsibility of the NAS layer. Among them, if the data is uplink data, it can be carried in the NAS message included in the uplink RRC message. If the data is downlink data, the downlink data can be carried in the NAS message included in the downlink RRC message.

[0098] For the user plane optimization mode, also known as "CIoT EPS user plane function optimization (User Plane CIoT EPS optimisation)", referred to as "UP solution", user data is sent through the user plane bearer. Taking into account the signaling overhead in the process of establishing / releasing the user plane bearer, the efficiency is obviously very low for NB-IoT small data packet services. Therefore, a new important process is added to the user plane optimization mode, namely the RRC connection suspension and resumption process. That is to say, when the terminal device has no data transmission, the RRC connection is not released directly. Instead, the network device first caches the access stratum (AS) context of the terminal device, and then releases the RRC connection, putting the terminal device into a suspended state. This process is also called the "access stratum context caching process".

[0099] As mentioned above, with the development of technology, various satellite operating modes have been introduced in NTN communication scenarios, such as the transparent forwarding mode and store-and-forward mode described above. However, due to the limited information available to connected terminal devices regarding NTN communication scenarios, NTN communication may not proceed smoothly, or even lead to the inability of terminal devices to communicate in the connected NTN communication scenario.

[0100] Therefore, to address the above-mentioned issues, embodiments of the present application provide a wireless communication method, in which a network device can send first information associated with NTN communication to a first terminal device. Accordingly, the first terminal device can perform subsequent communication processes based on the first information. Compared to traditional solutions in which terminal devices communicate according to preconfigured communication methods, this helps increase the likelihood of successful communication for the terminal devices. For ease of understanding, the wireless communication method of an embodiment of the present application is described below in conjunction with Figure 7. The method shown in Figure 7 includes step S710.

[0101] In step S710, the network device sends first information to the first terminal device.

[0102] In some implementations, the first terminal device is a terminal device whose RRC connection is in a suspended state.

[0103] The embodiment of the present application does not limit the transmission method of the first information. In some implementations, the first information is transmitted in a broadcast manner. Of course, in the embodiment of the present application, the first information can also be transmitted in a unicast manner.

[0104] In other implementations, the first information may be carried in a system message. For example, the first information may be carried in SIB1. In another example, the first information may be carried in MIB. In another example, the first information may be carried in SIB19. In another example, the first information may be carried in SIB31. Of course, the first information may also be transmitted separately as dedicated signaling.

[0105] For ease of understanding, the following text introduces the first information of the embodiments of the present application in combination with the three embodiments provided in the embodiments of the present application.

[0106] In embodiment 1, the first information includes first cell barring information and / or second cell barring information.

[0107] As previously mentioned, some protocols (for example, R17 / R18 NTN communications) introduce cell barred information 2 (also known as "cellBarred-NTN") to indicate whether the current cell is available for NTN connections. Accordingly, a terminal device can determine whether to access the cell based on this cell barred information. Currently, satellites in cells available for NTN connections can operate in various modes. In these situations, a terminal device may be unable to communicate with the satellite after accessing the cell, resulting in reduced communication efficiency.

[0108] Therefore, to address the above issues, embodiments of the present application propose that first cell barring information and / or second cell barring information can be included in the first information. In this way, access to first-category terminal devices and / or second-category terminal devices can be controlled using the first-cell barring information and / or the second-cell barring information, thereby helping to improve communication efficiency for high-end devices.

[0109] The first cell prohibition information indicates whether the first cell allows the first type of terminal equipment to access. In other words, the first cell prohibition information is used to indicate whether the first cell allows or prohibits the first type of terminal equipment from accessing. Therefore, the first cell prohibition information is also called "access restriction indication information".

[0110] In some implementations, the terminal type of the first category of terminal devices may be related to the satellite's operating mode. For example, if the satellite's operating mode includes store-and-forward mode, the first category of terminal devices may be terminal devices that support satellite operation in store-and-forward mode. Accordingly, the first cell barring information is used to indicate whether the first cell allows access to terminal devices that support satellite operation in store-and-forward mode. Alternatively, it can be understood that the first cell barring information is used to indicate whether the first cell supports satellite operation in store-and-forward mode. In other words, the first cell barring information is associated with the store-and-forward mode and, therefore, may also be referred to as "cellBarred-NTN-SF."

[0111] It should be noted that, taking the first cell barring information represented by "cellBarred-NTN-SF" as an example, if the first cell barring information is set to "barred", the first cell barring information is used to indicate that the first cell prohibits the first type of terminal device from accessing. Conversely, if the first cell barring information is set to "not barred", the first cell barring information is used to indicate that the first cell allows the first type of terminal device to access.

[0112] The above-mentioned second cell prohibition information is used to indicate whether the first cell allows the second type of terminal equipment to access, or in other words, the second cell prohibition information is used to indicate whether the first cell allows or prohibits the second type of terminal equipment from accessing. Therefore, the first cell prohibition information is also called "restricted access indication information".

[0113] In some implementations, the terminal type of the second-category terminal device may be related to the satellite's operating mode. For example, if the satellite's operating mode includes a store-and-forward mode, the second-category terminal device may be a terminal device that does not support satellite operation in store-and-forward mode. Accordingly, the second cell barring information is used to indicate whether the first cell allows access to a terminal device that supports satellite operation in store-and-forward mode. Alternatively, it can be understood that the second cell barring information is used to indicate whether the first cell supports satellite operation in store-and-forward mode. In other words, the second cell barring information is associated with the store-and-forward mode and, therefore, can also be referred to as "cellBarred-NTN-SF."

[0114] It should be noted that, taking the second cell barring information represented by "cellBarred-NTN-SF" as an example, if the second cell barring information is set to "barred", the second cell barring information is used to indicate that the first cell prohibits the second type of terminal device from accessing. Conversely, if the second cell barring information is set to "not barred", the second cell barring information is used to indicate that the first cell allows the second type of terminal device to access.

[0115] In some implementations, both the first and second category terminal devices are NTN-capable terminal devices, and the NTN capabilities of the first and second category terminal devices are different. The different capabilities of the first and second category terminal devices may include the case where both the first and second category terminal devices support NTN communications, but the first category terminal device supports satellite operation in store-and-forward mode, while the second category terminal device does not support satellite operation in store-and-forward mode.

[0116] Of course, in the embodiments of the present application, there is no specific limitation on the first category terminal device and the second category terminal device. For example, the capabilities of the first category terminal device and the second category terminal device are not exactly the same. It can be that both the first category terminal device and the second category terminal device support NTN communication, but the first category terminal device is a terminal device that supports the satellite to operate in a store-and-forward mode, and the second category terminal device is a terminal device that supports the satellite to operate in a transparent forwarding mode.

[0117] The above describes the first cell barring information and / or second cell barring information provided in the embodiments of the present application. In some scenarios, the first cell barring information can be used in combination with known cell barring information. For ease of understanding, the following description uses the known cell barring information including cell barring information 1 as an example. Cell barring information 1 is used to indicate whether access to the first cell is permitted.

[0118] In some implementations, cell barring information 1 and first cell barring information can be used in combination with each other. The cell barring information 1 (also known as "cellBarred") is used to indicate whether the first cell allows access by third-category terminal devices, which are terminal devices that do not have NTN capabilities. For example, the network device can send cell barring information 1 and the first cell barring information to the first terminal device. Accordingly, the first terminal device can determine whether the first cell allows access by third-category terminal devices based on the cell barring information 1, and determine whether the first cell allows access by first-category terminal devices based on the first cell barring information. That is, if the cell barring information 1 indicates that the first cell allows access by third-category terminal devices, and the first cell barring information indicates that the first cell allows access by first-category terminal devices, then if the first terminal device is a first-category terminal device, the first terminal device can access the first cell. Conversely, if the cell barring information 1 indicates that the first cell does not allow access by third-category terminal devices, and the first cell barring information indicates that the first cell does not allow access by first-category terminal devices, then if the first terminal device is a first-category terminal device, the first terminal device cannot access the first cell.

[0119] In other implementations, the cell barring information 1 and the second cell barring information can be used in combination with each other. The cell barring information 1 (also known as "cellBarred") is used to indicate whether the first cell allows access to a third type of terminal device, and the third type of terminal device is a terminal device that does not have NTN capabilities. For example, the network device can send the cell barring information 1 and the second cell barring information to the first terminal device. Accordingly, the first terminal device can determine whether the first cell allows access to a third type of terminal device based on the cell barring information 1, and determine whether the first cell allows access to a second type of terminal device based on the first cell barring information. That is to say, if the cell barring information 1 indicates that the first cell allows access to a third type of terminal device, and the second cell barring information indicates that the first cell allows access to a second type of terminal device, then if the first terminal device is a second type of terminal device, the first terminal device can access the first cell. On the contrary, if the cell barring information 1 indicates that the first cell does not allow access to a third type of terminal device, and the second cell barring information indicates that the first cell does not allow access to a second type of terminal device, then if the first terminal device is a second type of terminal device, the first terminal device cannot access the first cell.

[0120] For ease of understanding, the following takes cell 1 as the first cell and describes the access method of an embodiment of the present application in conjunction with FIG8 . The method shown in FIG8 includes steps S810 and S820. Assume that the satellite in cell 1 operates in store-and-forward mode, and the cell barring information "cellBarred" of cell 1 is set to prohibited, indicating that terminal devices without NTN capabilities are not allowed to access, and the cell barring information "cellBarred-NTN" of cell 1 is set to prohibited, indicating that terminal devices that do not support the satellite operating in store-and-forward mode are not allowed to access. In addition, the first terminal device is a terminal device that supports the satellite operating in the store-and-forward scenario.

[0121] In step S810, the network device sends a system message in a broadcast manner.

[0122] In some implementations, the cell barring information "cellBarred-NTN-SF" carried in the system message is set to allow, which is used to indicate that cell 1 allows access by terminal devices that support satellite operation in store-and-forward mode.

[0123] In step S820 , the first terminal device receives a system message and determines whether to access cell 1 based on the cell barring information of cell 1 .

[0124] In some implementations, the first terminal device can determine that cell 1 allows the first terminal device to access based on the cell barring information (cellBarred, cellBarred-NTN and cellBarred-NTN-SF) of cell 1. At this time, the first terminal device can choose to access cell 1.

[0125] It should be noted that, in the above solution, if the cell barring information "cellBarred-NTN" of cell 1 is set to prohibited, cell 1 prohibits the first terminal device from accessing. At this time, the first terminal device can choose not to access cell 1.

[0126] In an embodiment of the present application, by setting the cell barring information "cellBarred" and "cellBarred-NTN", it can be indicated that terminal devices that do not support satellite operation in storage and forwarding mode are prohibited from accessing the first cell, which helps to avoid inappropriate terminal devices (i.e., terminal devices that do not support satellite operation in storage and forwarding mode) from residing in the first cell.

[0127] In addition, the introduction of cell barring information "cellBarred-NTN-SF" can control whether terminal devices that support satellite operation in store-and-forward mode are allowed to access the first cell, which helps network devices flexibly control the access of such terminal devices based on the load conditions of the first cell.

[0128] In embodiment 2, the first information may carry satellite identification information of the first cell.

[0129] As previously mentioned, for the first terminal device that transmits data based on the user plane optimization mode, its access layer context needs to be stored in the network device (i.e., satellite) corresponding to the cell to save the signaling overhead required to establish the user plane bearer. However, in some scenarios (for example, if the satellite operates in store-and-forward mode), there may be no inter-satellite link between satellites, so the access layer context of the first terminal device cannot be transmitted between satellites. At this time, if the satellite identification information in the first cell is different from the satellite identification information of the target cell, the network device in the first cell may not be able to obtain the access layer context information of the first terminal device, resulting in the first terminal device being unable to transmit data based on the user plane optimization mode in the first cell.

[0130] Therefore, in an embodiment of the present application, by carrying the satellite identification information of the first cell in the first information, it helps the first terminal device to determine whether to perform data transmission based on the user plane optimization mode, so as to improve the accuracy of data transmission.

[0131] In the embodiments of the present application, the satellite identification information is not specifically limited. For example, the satellite identification information may include the index of the satellite. For another example, the satellite identification information may include the identification ID information of the satellite.

[0132] In an embodiment of the present application, by carrying the satellite identification information of the first cell in the first information, it helps the first terminal device to determine whether to reside in the first cell and / or the data transmission method in the first cell, so as to improve the communication efficiency of the first terminal device.

[0133] In some implementations, the satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: whether it is camped in the first cell; and a data transmission mode in the first cell. The data transmission mode in the first cell includes data transmission based on a user plane optimization mode and / or data transmission based on a control plane optimization mode.

[0134] In some implementations, whether the above-mentioned resides in the first cell and / or the data transmission method in the first cell can be determined based on the satellite identification information of the first cell and the satellite identification information of the target cell. For ease of understanding, the target cell in the embodiment of the present application is first introduced below.

[0135] The above-mentioned target cell may be a cell that configures the first terminal device to be in the suspension configuration (suspendConfig) information, or the target cell may be a cell that stores the access layer context of the first terminal device. For example, the target cell may be a cell that configures the suspension configuration information for the first terminal device when the first terminal device enters the idle state from the connected state. For another example, the target cell may be a cell that configures the suspension configuration information for the first terminal device when the first terminal device enters the inactive state from the connected state. For another example, the target cell may be a cell that configures the suspension configuration information for the first terminal device when the first terminal device is released to enter the inactive state. For another example, the target cell may be a cell that configures the suspension configuration information for the first terminal device when the first terminal device is released to enter the idle state.

[0136] In the embodiments of the present application, the manner in which the first terminal device obtains the satellite identification information of the target cell is not limited. In some implementations, if the first terminal device is located in cell 1 and the network device in cell 1 configures suspension configuration information for the first terminal device, the first terminal device may record the satellite identification information of the current cell as the satellite identification information of the target cell.

[0137] Taking the example of the first information being used by a first terminal device to determine whether to camp on a first cell, the first terminal device may determine whether to camp on the first cell based on the satellite identification information of the first cell and the satellite identification information of the target cell. In some implementations, if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device may camp on the first cell.

[0138] That is to say, if the satellite identifier of the first cell is the same as the satellite identifier of the target cell, the first cell also stores the access layer context of the first terminal device. At this time, the first terminal device can reside in the first cell to subsequently transmit data based on the user plane optimization mode in the first cell, which helps to reduce the signaling transmission overhead required for the user plane establishment and / or release process.

[0139] In other implementations, if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device may not reside in the first cell. Of course, in the embodiment of the present application, if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device may reside in the first cell. For example, a user plane bearer may be re-established for the first terminal device in the first cell for data transmission.

[0140] In other words, if the satellite identifier of the first cell is different from the satellite identifier of the target cell, the first cell does not store the access layer context of the first terminal device. In this case, the first terminal device may not reside in the first cell, or the first terminal device may consider that the first cell is prohibited from access. Of course, in this scenario, the first terminal device can also choose to reside in the first cell.

[0141] It should be noted that if the first terminal device does not reside in the first cell, the first terminal device may reselect another cell to reside in. Of course, in the embodiment of the present application, the first terminal device may not reselect another cell to reside in.

[0142] Taking the example of the first information being used by the first terminal device to determine the data transmission method in the first cell, the first terminal device can determine the data transmission method in the first cell based on the satellite identification information of the first cell and the satellite identification information of the target cell. In some implementations, if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device transmits data in the first cell based on the user plane optimization mode. Of course, in an embodiment of the present application, if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device can also transmit data in the first cell based on other methods. For example, the first terminal device can transmit data in the first cell based on the control plane optimization mode, and this embodiment of the present application is not limited to this.

[0143] That is to say, if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first cell also stores the access layer context of the first terminal device. At this time, the first terminal device can reside in the first cell and transmit data in the first cell based on the user plane optimization mode, which helps to reduce the signaling transmission overhead required for the user plane establishment and / or release process.

[0144] In some implementations, if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not perform data transmission in the first cell based on the user plane optimization mode. For example, the first terminal device may perform data transmission in the first cell based on the control plane optimization mode, which helps reduce the latency of the data transmission by the first terminal device.

[0145] That is to say, if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first cell does not store the access layer context of the first terminal device. At this time, the first terminal device can reside in the first cell and transmit data in the first cell based on the control plane optimization mode, which helps to reduce the delay required for the first terminal device to transmit data.

[0146] It should be noted that even if the first terminal device is first configured to perform data transmission based on the user plane optimization mode, when the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device can also perform data transmission based on the control plane optimization model.

[0147] For ease of understanding, the following describes a method for wireless communication according to an embodiment of the present application in conjunction with Figure 9. The method shown in Figure 9 includes steps S910 to S960.

[0148] In step S910, the network device sends a system message of the first cell in a broadcast manner.

[0149] In some implementations, the system message carries satellite identification information of the first cell.

[0150] In step S920, the first terminal device records the satellite identification information of the target cell.

[0151] For example, when the first terminal device enters the IDLE state or INACTIVE state from the connected state, the network device in cell 1 configures the suspension configuration information for the first terminal device. At this time, the first terminal device can record the satellite identification information in cell 1 as the satellite identification information in the target cell.

[0152] In step S930, the first terminal device in the non-connected state reads the system message of the first cell and obtains the satellite identification information of the first cell.

[0153] In step S940, the first terminal device determines whether the satellite identification information of the first cell and the satellite identification information of the target cell are the same.

[0154] If the satellite identification information of the first cell and the satellite identification information of the target cell are the same, step S950 is executed; if the satellite identification information of the first cell and the satellite identification information of the target cell are the same, step S960 is executed.

[0155] In step S950, the first terminal device determines to reside in the first cell.

[0156] In some implementations, the first terminal device may perform data transmission in the first cell based on a user plane optimization mode.

[0157] In step S960, the first terminal device determines whether to reside in the first cell or not.

[0158] In some implementations, if the first terminal device determines not to reside in the first cell, the first terminal device may reselect another cell in which it can reside.

[0159] In some other implementations, if the first terminal device is determined to reside in the first cell, the first terminal device can transmit data based on the control plane optimization mode in the first cell.

[0160] As previously introduced, for the first terminal device that performs data transmission based on the user plane optimization mode, its access layer context needs to be stored in the network device (i.e., satellite) corresponding to the cell to save the signaling overhead required to establish the user plane bearer. However, in some scenarios (for example, if the satellite operates in store-and-forward mode), there may be no inter-satellite link between satellites, so the access layer context of the first terminal device cannot be transmitted between satellites. At this time, if the satellite identification information in the first cell is different from the satellite identification information of the target cell, the network device in the first cell may not be able to obtain the access layer context information of the first terminal device, resulting in the first terminal device being unable to perform data transmission based on the user plane optimization mode in the first cell. Therefore, in an embodiment of the present application, by carrying the satellite identification information of the first cell in the first information, it is helpful for the first terminal device to determine whether to perform data transmission based on the user plane optimization mode, so as to improve the accuracy of data transmission. On the other hand, if the satellite identification information of the first cell is different from the satellite information of the target cell, the first terminal device can determine to reside in the first cell and perform data transmission based on the control plane optimization scheme, which helps to increase the possibility of the first terminal device transmitting data.

[0161] Embodiment 3: The first information carries first indication information.

[0162] As previously mentioned, for the first terminal device that transmits data based on the user plane optimization mode, its access layer context needs to be stored in the network device (i.e., satellite) corresponding to the cell to save the signaling overhead required to establish the user plane bearer. However, in some scenarios (for example, if the satellite operates in store-and-forward mode), there may be no inter-satellite link between satellites, so the access layer context of the first terminal device cannot be transmitted between satellites. At this time, if the satellite identification information in the first cell is different from the satellite identification information of the target cell, the network device in the first cell may not be able to obtain the access layer context information of the first terminal device, resulting in the first terminal device being unable to transmit data based on the user plane optimization mode in the first cell.

[0163] Therefore, in response to the above problem, in an embodiment of the present application, the network device can send a first indication message to the first terminal device to instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode, so that the first terminal device can transmit data based on the control plane optimization mode, which helps to increase the possibility of the first terminal device transmitting data.

[0164] In some implementations, the first indication information is sent when a first condition is not met, where the first condition is one or more of the following: the network device stores the access layer context of the first terminal device; and the network device can obtain the access layer context of the first terminal device from other network devices.

[0165] Taking the first condition including that the network device stores the access layer context of the first terminal device as an example, in some implementations, if the first condition is not met, that is, the network device does not store the access layer context of the first terminal device, the network device can instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode through the first indication information.

[0166] It should be noted that if the first condition is met, that is, the network device stores the access layer context of the first terminal device, the first terminal device can transmit data based on the user plane optimization mode.

[0167] Taking the example in which the first condition includes the network device being able to obtain the access layer context of the first terminal device from other network devices, in some implementations, if the first condition is not met, that is, the network device cannot obtain the access layer context of the first terminal device from other network devices, the network device can instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode through the first indication information.

[0168] It should be noted that if the first condition is met, that is, the network device stores the access layer context of the first terminal device, the first terminal device can transmit data based on the user plane optimization mode.

[0169] In addition, the above description uses the example that the first condition can be used alone. In an embodiment of the present application, the above-mentioned first conditions can also be used in combination with each other, which helps to increase the possibility of the first terminal device transmitting data based on the user plane optimization mode. For example, the first condition includes that the network device stores the access layer context of the first terminal device, and the network device can obtain the access layer context of the first terminal device from other network devices. Accordingly, if the first condition is not met, that is, the network device cannot obtain the access layer context of the first terminal device from other network devices, and the network device does not store the access layer context of the first terminal device, then the network device can instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode through the first indication information.

[0170] In some implementations, the first indication information is carried in a response message to a connection restoration request message sent by the first terminal device. For example, the first terminal device may request the network device to restore the connection by sending a connection restoration request message to the network device. Accordingly, in response to receiving the connection restoration request message, the network device may determine whether the access layer context of the first terminal device can be obtained. At this time, if the network device determines that the access layer context of the first terminal device cannot be obtained, the network device may instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode through the first indication information.

[0171] For ease of understanding, the following describes a wireless communication method according to another embodiment of the present application in conjunction with FIG10. The method shown in FIG10 includes steps S1010 to S1040. Assume that the first terminal device is configured to perform data transmission based on the user plane optimization mode, that is, the NAS layer of the first terminal device selects to perform data transmission based on the user plane optimization mode.

[0172] In step S1010, the first terminal device sends a connection recovery request message to the network device to initiate a connection recovery process.

[0173] In some implementations, if the data to be transmitted is small data transmission (SDT) or early data transmission (EDT), the data to be transmitted can be multiplexed with the connection recovery request message in Msg3 during the random access process and sent to the network device.

[0174] In step S1020 , in response to receiving the connection recovery request message, the network device determines whether the access layer context of the first terminal device can be acquired.

[0175] If the network device cannot obtain the access layer context of the first terminal device, step S1030 is executed. If the network device can obtain the access layer context of the first terminal device, step S1040 is executed.

[0176] In step S1030, the network device sends a response message 1 to the connection recovery request message to the first terminal device.

[0177] In some implementations, the response message 1 carries first indication information to instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode. Accordingly, in response to receiving the response message 1, the first terminal device may perform data transmission based on the control plane optimization mode. For example, the first terminal device may use NAS signaling to send the data to be transmitted.

[0178] In step S1040, the network device sends a response message 2 to the connection recovery request message to the first terminal device.

[0179] In some implementations, the response message 2 instructs the first terminal device to enter an RRC connected state and perform data transmission based on a user plane optimization mode. Alternatively, the response message 2 instructs the first terminal device to respond to a connection release message after receiving data (e.g., SDT, EDT).

[0180] In an embodiment of the present application, if the network device does not store the access layer context of the first terminal device, and the network device cannot obtain the access layer context of the first terminal device, then data transmission based on the user plane optimization mode cannot be completed, that is, the network device cannot correctly receive the data of the first terminal device (for example, the network device cannot know the access layer security key used by the first terminal device to encrypt the data). At this time, the first terminal device can fall back to the control plane optimization mode based on the first indication information, and use NAS signaling for data transmission, and the data transmission does not depend on the AS security key, which helps to increase the probability that the data of the first terminal device is correctly received by the network device.

[0181] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 10. The device embodiment of the present application is described in detail below in conjunction with Figures 11 to 13. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for parts not described in detail, reference can be made to the above method embodiment.

[0182] FIG11 is a schematic diagram of a terminal device according to an embodiment of the present application. The terminal device shown in FIG11 is a first terminal device, and the terminal device 1100 shown in FIG11 includes a receiving unit 1110 .

[0183] The receiving unit 1110 is configured to receive first information sent by a network device, where the first information includes one or more of the following: first cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; second cell prohibition information, used to indicate whether the first cell allows a second type of terminal device to access; satellite identification information of the first cell; and first indication information, used to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; wherein both the first type of terminal device and the second type of terminal device are terminal devices with NTN capabilities, and the NTN capabilities of the first type of terminal device and the second type of terminal device are not completely the same.

[0184] In some implementations, the first type of terminal device is a terminal device that supports satellite operation in a store-and-forward mode; and / or the second type of terminal device is a terminal device that does not support satellite operation in a store-and-forward mode.

[0185] In some implementations, the satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: whether to reside in the first cell; and a data transmission method in the first cell.

[0186] In some implementations, the terminal device further includes: if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device resides in the first cell; and / or if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not reside in the first cell.

[0187] In some implementations, the terminal device further includes: if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device performs data transmission in the first cell based on the user plane optimization mode; and / or if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not perform data transmission in the first cell based on the user plane optimization mode.

[0188] In some implementations, the first terminal device does not transmit data in the first cell based on a user plane optimization mode, including: the first terminal device transmits data in the first cell based on a control plane optimization mode.

[0189] In some implementations, the target cell includes a cell that configures suspension configuration information for the first terminal device; or, the target cell is a cell that stores an access layer context of the first terminal device.

[0190] In some implementations, the satellite identification information of the first cell is carried in the system information of the first cell.

[0191] In some implementations, the first indication information is carried in a response message to a connection recovery request message sent by the first terminal device.

[0192] In some implementations, the first indication information is sent when a first condition is not met, where the first condition is one or more of the following: the network device stores the access layer context of the first terminal device; and the network device can obtain the access layer context of the first terminal device from other network devices.

[0193] In some implementations, the first terminal device is a terminal device whose RRC connection is in a suspended state.

[0194] In some implementations, the first information further includes: third cell prohibition information, which is used to indicate whether the first cell allows a third type of terminal device to access, where the third type of terminal device is a terminal device that does not have NTN capability.

[0195] In some implementations, the first terminal device is a NB-IoT terminal or an eMTC terminal.

[0196] FIG12 is a schematic diagram of a network device according to an embodiment of the present application. The network device 1200 shown in FIG12 includes a sending unit 1210 .

[0197] The sending unit 1210 is configured to send first information, where the first information includes one or more of the following: first cell barring information, used to indicate whether the first cell allows a first type of terminal device to access; second cell barring information, used to indicate whether the first cell allows a second type of terminal device to access; satellite identification information of the first cell; and first indication information, used to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; wherein both the first type of terminal device and the second type of terminal device are terminal devices with NTN capabilities, and the NTN capabilities of the first type of terminal device and the second type of terminal device are not completely the same.

[0198] In some implementations, the first type of terminal device is a terminal device that supports satellite operation in a store-and-forward mode; and / or the second type of terminal device is a terminal device that does not support satellite operation in a store-and-forward mode.

[0199] In some implementations, the satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: whether to reside in the first cell; and a data transmission method in the first cell.

[0200] In some implementations, if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device resides in the first cell; and / or if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not reside in the first cell.

[0201] In some implementations, if the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device performs data transmission in the first cell based on the user plane optimization mode; and / or if the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not perform data transmission in the first cell based on the user plane optimization mode.

[0202] In some implementations, the first terminal device does not transmit data in the first cell based on a user plane optimization mode, including: the first terminal device transmits data in the first cell based on a control plane optimization mode.

[0203] In some implementations, the target cell includes a cell that configures suspension configuration information for the first terminal device; or, the target cell is a cell that stores an access layer context of the first terminal device.

[0204] In some implementations, the satellite identification information of the first cell is carried in the system information of the first cell.

[0205] In some implementations, the first indication information is carried in a response message to a connection recovery request message sent by the first terminal device.

[0206] In some implementations, the first indication information is sent when a first condition is not met, where the first condition is one or more of the following: the network device stores the access layer context of the first terminal device; and the network device can obtain the access layer context of the first terminal device from other network devices.

[0207] In some implementations, the first terminal device is a terminal device whose RRC connection is in a suspended state.

[0208] In some implementations, the first information further includes: third cell prohibition information, which is used to indicate whether the first cell allows a third type of terminal device to access, where the third type of terminal device is a terminal device that does not have NTN capability.

[0209] In some implementations, the first terminal device is a NB-IoT terminal or an eMTC terminal.

[0210] In an optional embodiment, the receiving unit 1110 may be a transceiver 1330 , and the terminal device 1100 may further include a processor 1310 and a memory 1320 , as specifically shown in FIG13 .

[0211] In an optional embodiment, the sending unit 1210 may be a transceiver 1330, and the network device 1200 may further include a processor 1310 and a memory 1320, as specifically shown in FIG13 .

[0212] Figure 13 is a schematic block diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 13 indicate that the unit or module is optional. Apparatus 1300 may be used to implement the method described in the above method embodiment. Apparatus 1300 may be a chip, a terminal device, or a network device.

[0213] The device 1300 may include one or more processors 1310. The processor 1310 may support the device 1300 to implement the method described in the above method embodiment. The processor 1310 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0214] The apparatus 1300 may further include one or more memories 1320. The memories 1320 store programs that can be executed by the processor 1310, causing the processor 1310 to perform the methods described in the above method embodiments. The memories 1320 may be independent of the processor 1310 or integrated into the processor 1310.

[0215] The apparatus 1300 may further include a transceiver 1330. The processor 1310 may communicate with other devices or chips via the transceiver 1330. For example, the processor 1310 may transmit and receive data with other devices or chips via the transceiver 1330.

[0216] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0217] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0218] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0219] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0220] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0221] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0222] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0223] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0224] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0225] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0226] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0227] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0228] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0229] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0230] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0231] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A wireless communication method, characterized in that: include: The first terminal device receives first information sent by the network device, where the first information includes one or more of the following: First cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; The second cell prohibition information is used to indicate whether the first cell allows the second type of terminal equipment to access; Satellite identification information of the first cell; as well as The first indication information is used to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; The first-category terminal device and the second-category terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first-category terminal device and the second-category terminal device are not completely the same.

2. The method according to claim 1, characterized in that The first type of terminal equipment is a terminal equipment that supports the satellite to work in the store-and-forward mode; and / or, the second type of terminal equipment is a terminal equipment that does not support the satellite to work in the store-and-forward mode.

3. The method according to claim 1 or 2, characterized in that: The satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: Whether the user resides in the first cell; A data transmission mode in the first cell.

4. The method according to claim 3, characterized in that The method further comprises: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device resides in the first cell; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not reside in the first cell.

5. The method according to claim 3, characterized in that: The method further comprises: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device performs data transmission in the first cell based on the user plane optimization mode; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not perform data transmission based on the user plane optimization mode in the first cell.

6. The method according to claim 5, characterized in that The first terminal device does not transmit data based on the user plane optimization mode in the first cell, including: the first terminal device transmits data based on the control plane optimization mode in the first cell.

7. The method according to any one of claims 4 to 6, characterized in that The target cell includes a cell configured with suspension configuration information for the first terminal device; or, the target cell is a cell storing an access layer context of the first terminal device.

8. The method according to any one of claims 1 to 7, characterized in that The satellite identification information of the first cell is carried in the system information of the first cell.

9. The method according to claim 1 or 2, characterized in that: The first indication information is carried in a response message to the connection recovery request message sent by the first terminal device.

10. The method according to claim 1, 2 or 9, characterized in that The first indication information is sent when a first condition is not satisfied, and the first condition is one or more of the following: The network device stores the access layer context of the first terminal device; and The network device can obtain the access layer context of the first terminal device from other network devices.

11. The method according to any one of claims 1 to 10, characterized in that The first terminal device is a terminal device whose RRC connection is in a suspended state.

12. The method according to any one of claims 1 to 8, characterized in that The first information also includes: The third cell prohibition information is used to indicate whether the first cell allows a third type of terminal device to access, where the third type of terminal device is a terminal device that does not have NTN capability.

13. The method according to any one of claims 1 to 12, characterized in that The first terminal device is a NB-IoT terminal or an eMTC terminal.

14. A wireless communication method, characterized in that: include: The network device sends first information, where the first information includes one or more of the following: First cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; The second cell prohibition information is used to indicate whether the first cell allows the second type of terminal equipment to access; Satellite identification information of the first cell; as well as The first indication information is used to instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode; The first type of terminal equipment and the second type of terminal equipment are both terminal equipment with NTN capabilities, and the first type of terminal equipment The NTN capabilities of the terminal equipment and the second type of terminal equipment are not completely the same.

15. The method according to claim 14, characterized in that The first type of terminal equipment is a terminal equipment that supports the satellite to work in the store-and-forward mode; and / or, the second type of terminal equipment is a terminal equipment that does not support the satellite to work in the store-and-forward mode.

16. The method according to claim 14 or 15, characterized in that The satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: Whether the user resides in the first cell; A data transmission mode in the first cell.

17. The method according to claim 16, characterized in that: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device resides in the first cell; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not reside in the first cell.

18. The method according to claim 16, characterized in that: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device performs data transmission in the first cell based on the user plane optimization mode; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not perform data transmission based on the user plane optimization mode in the first cell.

19. The method according to claim 18, characterized in that The first terminal device does not transmit data based on the user plane optimization mode in the first cell, including: the first terminal device transmits data based on the control plane optimization mode in the first cell.

20. The method according to any one of claims 17 to 19, characterized in that The target cell includes a cell configured with suspension configuration information for the first terminal device; or, the target cell is a cell storing an access layer context of the first terminal device.

21. The method according to any one of claims 14 to 20, characterized in that The satellite identification information of the first cell is carried in the system information of the first cell.

22. The method according to claim 14 or 15, characterized in that The first indication information is carried in a response message to the connection recovery request message sent by the first terminal device.

23. The method according to claim 14, 15 or 22, characterized in that The first indication information is sent when a first condition is not satisfied, and the first condition is one or more of the following: The network device stores the access layer context of the first terminal device; and The network device can obtain the access layer context of the first terminal device from other network devices.

24. The method according to any one of claims 14 to 23, characterized in that The first terminal device is a terminal device whose RRC connection is in a suspended state.

25. The method according to any one of claims 14 to 24, characterized in that The first information also includes: The third cell prohibition information is used to indicate whether the first cell allows a third type of terminal device to access, where the third type of terminal device is a terminal device that does not have NTN capability.

26. The method according to any one of claims 14 to 25, characterized in that The first terminal device is a NB-IoT terminal or an eMTC terminal.

27. A terminal device, characterized in that: The terminal device is a first terminal device, comprising: A receiving unit, configured to receive first information sent by a network device, wherein the first information includes one or more of the following: First cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; The second cell prohibition information is used to indicate whether the first cell allows the second type of terminal equipment to access; Satellite identification information of the first cell; and The first indication information is used to instruct the first terminal device to switch from a user plane optimization mode to a control plane optimization mode; The first-category terminal device and the second-category terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first-category terminal device and the second-category terminal device are not completely the same.

28. The terminal device according to claim 27, characterized in that: The first type of terminal equipment is a terminal equipment that supports the satellite to work in the store-and-forward mode; and / or, the second type of terminal equipment is a terminal equipment that does not support the satellite to work in the store-and-forward mode.

29. The terminal device according to claim 27 or 28, characterized in that: The satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: Whether the user resides in the first cell; A data transmission mode in the first cell.

30. The terminal device according to claim 29, characterized in that: The terminal device further includes: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device resides in the first cell; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not reside in the first cell.

31. The terminal device according to claim 29, characterized in that: The terminal device further includes: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device performs data transmission in the first cell based on the user plane optimization mode; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not perform data transmission based on the user plane optimization mode in the first cell.

32. The terminal device according to claim 31, characterized in that: The first terminal device does not transmit data based on the user plane optimization mode in the first cell, including: the first terminal device transmits data based on the control plane optimization mode in the first cell.

33. The terminal device according to any one of claims 30 to 32, characterized in that: The target cell includes a cell configured with suspension configuration information for the first terminal device; or, the target cell is a cell storing an access layer context of the first terminal device.

34. The terminal device according to any one of claims 27 to 33, characterized in that: The satellite identification information of the first cell is carried in the system information of the first cell.

35. The terminal device according to claim 27 or 28, characterized in that: The first indication information is carried in a response message to the connection recovery request message sent by the first terminal device.

36. The terminal device according to claim 27, 28 or 35, characterized in that: The first indication information is sent when a first condition is not satisfied, and the first condition is one or more of the following: The network device stores the access layer context of the first terminal device; and The network device can obtain the access layer context of the first terminal device from other network devices.

37. The terminal device according to any one of claims 27 to 36, characterized in that: The first terminal device is a terminal device whose RRC connection is in a suspended state.

38. The terminal device according to any one of claims 27 to 37, characterized in that: The first information also includes: The third cell prohibition information is used to indicate whether the first cell allows a third type of terminal device to access, where the third type of terminal device is a terminal device that does not have NTN capability.

39. The terminal device according to any one of claims 27 to 38, characterized in that: The first terminal device is a NB-IoT terminal or an eMTC terminal.

40. A network device, characterized in that: include: A sending unit, configured to send first information, where the first information includes one or more of the following: First cell prohibition information, used to indicate whether the first cell allows a first type of terminal device to access; The second cell prohibition information is used to indicate whether the first cell allows the second type of terminal equipment to access; Satellite identification information of the first cell; as well as The first indication information is used to instruct the first terminal device to switch from the user plane optimization mode to the control plane optimization mode; The first-category terminal device and the second-category terminal device are both terminal devices with NTN capabilities, and the NTN capabilities of the first-category terminal device and the second-category terminal device are not completely the same.

41. The network device according to claim 40, characterized in that The first type of terminal equipment is a terminal equipment that supports the satellite to work in the store-and-forward mode; and / or, the second type of terminal equipment is a terminal equipment that does not support the satellite to work in the store-and-forward mode.

42. The network device according to claim 40 or 41, characterized in that: The satellite identification information of the first cell is used by the first terminal device to determine one or more of the following: Whether the user resides in the first cell; A data transmission mode in the first cell.

43. The network device according to claim 42, characterized in that: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device resides in the first cell; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device does not reside in the first cell.

44. The network device according to claim 42, characterized in that: If the satellite identification information of the first cell is the same as the satellite identification information of the target cell, the first terminal device performs data transmission in the first cell based on the user plane optimization mode; and / or If the satellite identification information of the first cell is different from the satellite identification information of the target cell, the first terminal device The first cell does not perform data transmission based on the user plane optimization mode.

45. The network device according to claim 44, characterized in that The first terminal device does not transmit data based on the user plane optimization mode in the first cell, including: the first terminal device transmits data based on the control plane optimization mode in the first cell.

46. ​​The network device according to any one of claims 43 to 45, characterized in that: The target cell includes a cell configured with suspension configuration information for the first terminal device; or, the target cell is a cell storing an access layer context of the first terminal device.

47. The network device according to any one of claims 40 to 46, characterized in that: The satellite identification information of the first cell is carried in the system information of the first cell.

48. The network device according to claim 40 or 41, characterized in that: The first indication information is carried in a response message to the connection recovery request message sent by the first terminal device.

49. The network device according to claim 40, 41 or 48, characterized in that: The first indication information is sent when a first condition is not satisfied, and the first condition is one or more of the following: The network device stores the access layer context of the first terminal device; and The network device can obtain the access layer context of the first terminal device from other network devices.

50. The network device according to any one of claims 40 to 49, characterized in that: The first terminal device is a terminal device whose RRC connection is in a suspended state.

51. The network device according to any one of claims 40 to 50, characterized in that: The first information also includes: The third cell prohibition information is used to indicate whether the first cell allows a third type of terminal device to access, where the third type of terminal device is a terminal device that does not have NTN capability.

52. The network device according to any one of claims 40 to 50, characterized in that: The first terminal device is a NB-IoT terminal or an eMTC terminal.

53. A terminal device, characterized in that: The terminal comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals, so that the terminal executes the method as described in any one of claims 1 to 13.

54. A network device, characterized in that: It comprises a transceiver, a memory and a processor, wherein the memory is used to store programs, and the processor is used to call the programs in the memory and control the transceiver to receive or send signals so that the network device executes the method as described in any one of claims 14-26.

55. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method according to any one of claims 1 to 26.

56. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 26.

57. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 26.

58. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 26.

59. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 26.

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