Method and apparatus in a node for wireless communication

Abstract

The invention provides a method and a device for wireless communication, which are helpful for terminal equipment in an NTN (Network Temporary Network) cell to execute cell redirection. The method comprises the following steps: a first node receives first information, wherein the first information is used for indicating at least one candidate non-terrestrial network NTN cell; wherein the at least one candidate NTN cell comprises a target NTN cell; based on the first information, performing reselection or redirection to a target NTN cell, the first information being related to one or more of the following information of the candidate NTN cell: satellite ephemeris information; satellite carrier information; effective time of ephemeris information; measuring timing configuration information based on the synchronization signal block; nTN cell identification is carried out; load information of a carrier frequency of the satellite; satellite identification; a network identifier to which the satellite belongs; a network identifier to which the satellite cell belongs; an operator identifier to which the satellite belongs; and identifying the operator to which the satellite cell belongs.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and more particularly to a method and apparatus in a node for wireless communication. BACKGROUND

[0002] With the development and popularity of non terrestrial network (NTN) technology, satellite communication providing wide area coverage is introduced into the mobile communication system to build an integrated space-air-ground network through low-orbit satellites, high-altitude platforms, etc. However, the non terrestrial network (NTN) system has strong mobility, and the continued use of the traditional redirection scheme causes the terminal to be prone to redirection failure, thereby causing the terminal to continuously search for a target cell, resulting in a problem of resource waste. SUMMARY

[0003] The present application provides a method and apparatus in a node for wireless communication. The following introduces each aspect of the embodiments of the present application.

[0004] In a first aspect, a method in a first node for wireless communication is provided, comprising: receiving, by the first node, first information, the first information being used to indicate at least one candidate non terrestrial network (NTN) cell; wherein the at least one candidate NTN cell comprises a target NTN cell; performing, by the first node, reselection or redirection to the target NTN cell based on the first information, the first information being related to one or more of the following information of the candidate NTN cell:

[0005] Satellite ephemeris information;

[0006] Satellite carrier information;

[0007] Valid time of ephemeris information;

[0008] Measurement timing configuration information based on synchronization signal block;

[0009] NTN cell identification;

[0010] Load information of carrier frequency of satellite;

[0011] Satellite identification;

[0012] Network identification to which the satellite belongs;

[0013] Network identification to which the satellite cell belongs;

[0014] Operator identification to which the satellite belongs;

[0015] Operator identification to which the satellite cell belongs.

[0016] In a second aspect, a method in a second node for wireless communication is provided, comprising: sending, by the second node, first information used as assistance for a first node to perform reselection or redirection to a target non-terrestrial network (NTN) cell, the first information being used to indicate at least one candidate NTN cell; wherein the at least one candidate NTN cell comprises a target NTN cell; the first information being related to one or more of the following information of the candidate NTN cell:

[0017] satellite ephemeris information;

[0018] satellite carrier information;

[0019] valid time of ephemeris information;

[0020] synchronization signal block based measurement timing configuration information;

[0021] NTN cell identification;

[0022] load information of carrier frequency of satellite;

[0023] satellite identification;

[0024] network identification to which the satellite belongs;

[0025] network identification to which the satellite cell belongs;

[0026] operator identification to which the satellite belongs;

[0027] operator identification to which the satellite cell belongs.

[0028] In a third aspect, a first node is provided, comprising a processor, a memory, and a communication interface, the memory being configured to store one or more computer programs, and the processor being configured to invoke the computer programs in the memory to cause the first node to perform some or all of the steps described in the method of the first aspect.

[0029] In a fourth aspect, a second node is provided, comprising a processor, a memory, and a communication interface, the memory being configured to store one or more computer programs, and the processor being configured to invoke the computer programs in the memory to cause the second node to perform some or all of the steps described in the method of the third aspect.

[0030] In a fifth aspect, an embodiment of the present application provides a communication system, which comprises the communication device described above. In another possible design, the system can further comprise other devices interacting with the communication device in the scheme provided by an embodiment of the present application.

[0031] In a sixth aspect, an embodiment of the present application provides a computer readable storage medium, which stores a computer program. The computer program causes a computer to perform some or all of the steps of the method in each of the aspects.

[0032] In a seventh aspect, an embodiment of the present application provides a computer program product. The computer program product includes a non-transitory computer readable storage medium storing a computer program. The computer program is operable to cause a computer to perform some or all of the steps of the method in each of the aspects. In some implementations, the computer program product can be a software installation package.

[0033] In an eighth aspect, an embodiment of the present application provides a chip. The chip 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 method in each of the aspects.

[0034] In a ninth aspect, an embodiment of the present application provides a communication device. The chip 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 method in each of the aspects.

[0035] In the embodiments of the present application, the network device provides a terminal with multiple candidate NTN cells that can be reselected or redirected, thereby avoiding the terminal continuously searching for a single NTN cell. In addition to improving the success rate of terminal reselection or redirection, more communication resources can also be saved. BRIEF DESCRIPTION OF DRAWINGS

[0036] FIG. 1A FIG. 1 is an example of a system architecture of a wireless communication system to which the embodiments of the present application can be applied.

[0037] FIG. 1B FIG. 2 is an example of a system architecture of an NTN system to which the embodiments of the present application can be applied.

[0038] FIG. 1C FIG. 3 is an example of a system architecture of another NTN system to which the embodiments of the present application can be applied.

[0039] FIG. 2 FIG. 4 is an example of a system architecture of another NTN system to which the embodiments of the present application can be applied.

[0040] FIG. 3 FIG. 5 is an example of a system architecture of another NTN system to which the embodiments of the present application can be applied.

[0041] FIG. 4A FIG. 6 is an example of a wireless protocol stack structure provided by the present application. FIG. 4B FIG. 7 is an example of a wireless protocol stack structure provided by the present application.

[0042] FIG. 5 A flowchart of a method of wireless communication is provided for an embodiment of the present application.

[0043] FIG. 6 A flowchart of another method of wireless communication is provided for an embodiment of the present application.

[0044] FIG. 7 A block diagram of a first node is provided for an embodiment of the present application.

[0045] FIG. 8 A block diagram of a second node is provided for another embodiment of the present application.

[0046] FIG. 9 A block diagram of a communication device is provided for another embodiment of the present application.

[0047] FIG. 10 A block diagram of a communication device is provided for an embodiment of the present application. DETAILED DESCRIPTION

[0048] Communication system architecture

[0049] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: a global system of mobile communication (GSM) system, a code division multiple access (CDMA) system, a wideband code division multiple access (WCDMA) system, a general packet radio service (GPRS), a long term evolution (LTE) system, an advanced long term evolution (LTE-A) system, a new radio (NR) system, an evolved system of the NR system, an LTE-based access to unlicensed spectrum (LTE-U) system, an NR-based access to unlicensed spectrum (NR-U) system, a non-terrestrial network (NTN) system, a universal mobile telecommunication system (UMTS), a wireless local area network (WLAN), a wireless fidelity (WiFi), a 5th-generation (5G) system, or other communication systems, for example, a future communication system such as a 6th-generation mobile communication system, or a satellite communication system, and the like.

[0050] Generally, a conventional communication system supports a limited number of connections, which is easy to implement. However, with the development of communication technology, a mobile communication system will not only support conventional communication, but 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, and the like. The embodiments of the present application can also be applied to these communication systems.

[0051] The communication system in the embodiments of the present application can be applied to a carrier aggregation (CA) scenario, can also be applied to a dual connectivity (DC) scenario, and can also be applied to a standalone (SA) network deployment scenario.

[0052] The communication system in the embodiments of the present application can be applied to an unlicensed spectrum, which can also be regarded as a shared spectrum, or can also be applied to a licensed spectrum, which can also be regarded as a dedicated spectrum.

[0053] The embodiments of the present application can be applied to a non-terrestrial network (NTN) system, and can also be applied to a terrestrial network (TN) system. As an example but not limitation, the NTN system includes an NR-based NTN system and a cellular internet of things (IOT)-based NTN system.

[0054] The embodiments of the present application combine network devices and terminal devices to describe various embodiments, wherein the terminal device can also be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user apparatus, etc.

[0055] In the embodiments of the present application, the terminal device can be a station (STATION, ST) in a WLAN, can be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA) device, a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, a wearable device, a terminal device in a next-generation communication system such as an NR network, or a terminal device in a future evolved public land mobile network (PLMN) network, etc.

[0056] In the embodiments of the present application, the terminal device can refer to a device providing voice and / or data connectivity to users, and can be used to connect people, things and machines, for example, handheld devices with wireless connection function, vehicle-mounted devices, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer (Pad), a notebook computer, a palm computer, 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 smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, etc. Optionally, the terminal device can be used to act as a base station. For example, the terminal device can act as a scheduling entity, which provides sidelink signals between terminal devices in V2X or D2D, etc. For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and the smart home device communicate with each other without relaying the communication signals through the base station.

[0057] In the embodiments of the present application, the terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; can also be deployed on the water surface (such as ships, etc.); and can also be deployed in the air (such as on airplanes, balloons and satellites, etc.).

[0058] In the embodiments of the present application, the terminal device can be a mobile phone, a pad, a computer with wireless transceiving 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 smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, or a wireless terminal device in smart home, etc. The terminal device involved in the embodiments of the present application can also be referred to as a terminal, a user equipment (UE), an access terminal device, a vehicle-mounted terminal, an industrial control terminal, a UE unit, a UE station, a mobile station, a mobile station, a remote station, a remote terminal device, a mobile device, a UE, a wireless communication device, a UE agent, or a UE apparatus, etc. The terminal device can also be fixed or mobile.

[0059] By way of example and not limitation, in the embodiments of the present application, the terminal device can also be a wearable device. The wearable device can also be referred to as a wearable smart device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes, etc. The wearable device is a portable device that is directly worn on the body or integrated into the clothes or accessories of the user. The wearable device is not only a hardware device, but also has powerful functions through software support and data interaction and cloud interaction. The general wearable smart device includes a full function, a large size, and can realize complete or partial functions without relying on a smart phone, such as a smart watch or smart glasses, etc., and only focuses on a certain application function and needs to cooperate with other devices such as a smart phone, such as various smart wristbands, smart jewelry, and other devices for monitoring body signs.

[0060] The network device in the embodiments of the present application can be a device for communicating with a terminal device, which can also be referred to as an access network device or a radio access network device, such as a network device, which can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node (or device) that accesses a terminal device to a wireless network. The base station can broadly cover various names in the following or be replaced by the following names, such as: Node B (NodeB), evolved Node B (eNB), next generation Node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station MeNB, auxiliary 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. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip for being arranged in the foregoing device or apparatus. The base station can also be a mobile switching center and a device that undertakes a base station function in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communication, network side device in 6G network, device that undertakes a base station function in future communication system, etc. The base station can support networks of 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 device.

[0061] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or a drone can be configured to act as a device that communicates with another base station.

[0062] In some deployments, the network device in the embodiments of the present application can refer to a CU or a DU, or the network device includes a CU and a DU. The gNB can also include an AAU.

[0063] The network device and the terminal device can be deployed on land, including indoor or outdoor, handheld or vehicle-mounted; can also be deployed on water surface; can also be deployed on aircraft, balloons and satellites in the sky. The scenarios in which the network device and the terminal device are located are not limited in the embodiments of the present application.

[0064] By way of example and without limitation, in the embodiments of the present application, the network device can have a mobile characteristic, for example, the network device can be a mobile device. In some embodiments of the present application, the network device can be a satellite, a balloon station. For example, the satellite can 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 can also be a base station arranged at a position on land, water, etc.

[0065] In the embodiments of the present application, the network device can serve a cell, and the terminal device communicates with the network device through a transmission resource (for example, a frequency domain resource, or a spectrum resource) used by the cell. The cell can be a cell corresponding to the network device (for example, a base station), and the cell can belong to a macro base station or a base station corresponding to a small cell. The small cell here can include a metro cell, a micro cell, a pico cell, a femto cell, etc., which have the characteristics of small coverage and low transmit power, and are suitable for providing high-speed data transmission services.

[0066] Exemplarily, FIG. 1A An architecture schematic diagram of a communication system is provided in the embodiments of the present application. As FIG. 1A shown, the communication system 100 can include a network device 110, which can be a device communicating with a terminal device 120 (or called a communication terminal, a terminal). The network device 110 can provide communication coverage for a specific geographic area, and can communicate with the terminal device located in the coverage area.

[0067] FIG. 1AExemplarily, one network device and two terminal devices are shown, in some embodiments of the present application, the communication system 100 can include a plurality of network devices and each network device can include other number of terminal devices within the coverage range of the network device, and the embodiments of the present application do not limit this.

[0068] Exemplarily, FIG. 1B Another schematic diagram of the architecture of a communication system is provided for the embodiments of the present application. Please refer to FIG. 1B , which includes a terminal device 1101 and a satellite 1102, and the terminal device 1101 and the satellite 1102 can communicate wirelessly. The network formed between the terminal device 1101 and the satellite 1102 can also be referred to as NTN. In FIG. 1B the architecture of the communication system shown in the figure, the satellite 1102 can have the function of a base station, and the terminal device 1101 and the satellite 1102 can communicate directly. Under 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 can be included in the communication system, and each network device 1102 can include other number of terminal devices within the coverage range of the network device, and the embodiments of the present application do not limit this.

[0069] Exemplarily, FIG. 1C Another schematic diagram of the architecture of a communication system is provided for the embodiments of the present application. Please refer to FIG. 1C , which includes a terminal device 1201, a satellite 1202 and a base station 1203, and the terminal device 1201 and the satellite 1202 can communicate wirelessly, and the satellite 1202 and the base station 1203 can communicate. The network formed between the terminal device 1201, the satellite 1202 and the base station 1203 can also be referred to as NTN. In FIG. 1C the architecture of the communication system shown in the figure, the satellite 1202 can not have the function of a base station, and the communication between the terminal device 1201 and the base station 1203 needs to be relayed through the satellite 1202. Under this kind of 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 can be included in the communication system, and each network device 1203 can include other number of terminal devices within the coverage range of the network device, and the embodiments of the present application do not limit this.

[0070] It should be noted that, FIGS. 1A-1C only as an example of the system to which the present application is applicable, of course, the method shown in the embodiments of the present application can also be applicable to other systems, for example, 5G communication system, LTE communication system, etc., and the embodiments of the present application do not limit this.

[0071] In some embodiments of the present application, FIGS. 1A-1CThe wireless communication system shown can also include a mobility management entity (MME), an access and mobility management function (AMF), and other network entities, which are not limited in the embodiments of the present application.

[0072] It should be understood that the devices with communication functions in the network / system in the embodiments of the present application can be referred to as communication devices. For example, FIG. 1A For example, the communication system 100 shown can include network devices 110 and terminal devices 120 with communication functions, which can be specific devices as described above, and will not be described here again. The communication devices can also include other devices in the communication system 100, such as network controllers, mobility management entities, and other network entities, which are not limited in the embodiments of the present application.

[0073] It should be understood that the "indication" mentioned in the embodiments of the present application can be direct indication, indirect indication, or can represent an associated relationship. For example, A indicates B, which can mean that B can be obtained by A; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0074] In the description of the embodiments of the present application, the term "corresponding" can represent a direct or indirect corresponding relationship between the two, or an associated relationship between the two, or an indication and being indicated, configuration and being configured, etc.

[0075] The "configuration" in the embodiments of the present application can include at least one of system message, radio resource control (RRC) signaling, and media access control layer control element (MAC CE).

[0076] In some embodiments of the present application, "predefined" or "preset" can be implemented by pre-storing corresponding codes, tables or other means for indicating related information in devices (such as terminal devices and network devices), and the specific implementation manner is not limited in the present application. For example, the pre-defined can refer to the definition in the protocol.

[0077] In some embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, which can include LTE protocol, NR protocol, and related protocols applied to future communication systems, which are not limited in the present application.

[0078] For the convenience of understanding, some related technical knowledge involved in the embodiments of the present application is introduced first. The following related technologies can be combined with the technical solutions of the embodiments of the present application in any way as optional schemes, and all belong to the protection scope of the embodiments of the present application. The embodiments of the present application include at least part of the following contents.

[0079] NTN

[0080] Currently, the 3rd generation partnership project (3GPP) international standard organization is studying non-terrestrial network (NTN) technology. The NTN generally adopts a satellite communication mode to provide communication services to ground users. Compared with a ground communication network (for example, a ground cellular network communication), satellite communication has many unique advantages.

[0081] Firstly, satellite communication is not limited by the user's region. For example, a general ground communication network cannot cover the ocean, high mountains, deserts and other areas where network equipment cannot be set up. Or, the ground communication network cannot cover some areas where communication coverage is not done due to sparse population. However, for satellite communication, since a satellite can cover a large ground area, and the satellite can orbit around the earth, in theory, every corner of the earth can be covered by the satellite communication network.

[0082] Secondly, satellite communication has great social value. Satellite communication can cover remote mountainous areas, poor countries or regions at a low cost, so that the people in these areas can enjoy advanced voice communication and mobile Internet technology. From this point of view, satellite communication helps to narrow the digital gap with developed areas and promotes the development of these areas.

[0083] Thirdly, satellite communication is far away, and the communication cost does not increase significantly with the increase of communication distance.

[0084] Finally, the stability of satellite communication is high and is not affected by natural disasters.

[0085] The types of communication satellites can be divided into LEO satellites, MEO satellites, GEO satellites, HEO satellites, etc. according to the different orbital altitudes. At the current stage, the main research is LEO satellites and GEO satellites.

[0086] LEO satellite altitude range is generally 500km-1500km. Correspondingly, the orbit period of LEO satellite is about 1.5 hours-2 hours. For LEO satellite, the signal propagation delay of single-hop communication between users is generally less than 20ms. The maximum satellite visible time corresponding to LEO satellite is about 20 minutes. LEO satellite has the advantages of short signal propagation distance, less link loss, and low requirement on the transmit power of terminal equipment.

[0087] The orbit height of GEO satellite is about 35786km. The period of GEO satellite rotating around the earth is 24 hours. For GEO satellite, the signal propagation delay of single-hop communication between users is generally about 250ms.

[0088] In order to ensure the coverage of satellite and improve the system capacity of the whole satellite communication system, the satellite usually adopts multi-beam to cover the ground area, so a satellite can form dozens or even hundreds of beams to cover the ground area. One beam of satellite can cover a ground area with a diameter of dozens to thousands of kilometers.

[0089] Currently, the NTN system can include an NR NTN system and an IoT NTN system.

[0090] NTN network architecture

[0091] The NTN network architecture can include the following network elements: gateway, feeder link, service link, and satellite.

[0092] One or more gateways can be included in the NTN network architecture, which can be used to connect the satellite and the ground public network. Generally, the gateway can be arranged on the ground.

[0093] The feeder link can refer to the link for communication between the gateway and the satellite.

[0094] The service link can refer to the link for communication between the terminal device and the satellite.

[0095] From the perspective of the functions provided by the satellite, the satellite can be divided into a transparent payload satellite and a regenerative payload satellite. Among them, the transparent payload satellite refers to a satellite that only provides the functions of radio frequency filtering, frequency conversion and amplification. Or in other words, the transparent payload satellite only provides transparent forwarding of signals and does not change the waveform signals it forwards. The regenerative payload satellite refers to a satellite that, in addition to providing the functions of radio frequency filtering, frequency conversion and amplification, can also provide one or more of the following functions: demodulation, decoding, routing, conversion, encoding, modulation, storage, etc. The regenerative payload satellite can have part or all of the functions of a base station. According to the functions provided by the satellite in the NTN network, the NTN network architecture can be divided into a bent-pipe transponder architecture (or simply bent-pipe or transparent architecture) and a regenerative transponder architecture (or simply regenerative architecture), FIG. 2 and FIG. 3 respectively give an example diagram of the bent-pipe NTN network architecture and the regenerative NTN network architecture.

[0096] Exemplarily, referring to FIG. 2 , the NTN system 200 takes the satellite 210 as an air platform. The satellite radio access network includes the satellite 210, the service link 220, the feeder link 230, the terminal device 240, the gateway (GW) 250, and the network 260 including the base station and the core network. Among them, the service link 220 refers to the link between the satellite 210 and the terminal device 240. The feeder link 230 refers to the link between the gateway 250 and the satellite 210.

[0097] FIG. 2 In the architecture shown, the base station is located on the earth behind the gateway 250, and the satellite 210 acts as a relay. The satellite 210 operates as a repeater that forwards the feeder link 230 signal to the service link 220, or forwards the service link 220 signal to the feeder link 230. That is, the satellite 210 does not have the function of the base station, and the communication between the terminal device 240 and the base station in the network 260 needs to be relayed through the satellite 210.

[0098] Exemplarily, referring to FIG. 3 , the satellite radio access network 300 includes the satellite 310, the service link 320, the feeder link 330, the terminal device 340, the gateway 350, and the network 360. Unlike the NTN system 200 in FIG. 2 , in the NTN system 300, there is a base station on the satellite 310, and the network 360 behind the gateway 350 only includes the core network.

[0099] FIG. 3In the illustrated architecture, the satellite 310 carries the base station 312, which can be connected directly to the earth-based core network through a link. The satellite 310 has the function of a base station, and the terminal device 340 can communicate directly with the satellite 310.

[0100] Wireless protocol stack

[0101] FIG. 4A and FIG. 4B respectively show a wireless protocol stack structure diagram of an embodiment of the present application. FIG. 4A and FIG. 4B Take the 5G wireless protocol stack as an example for introduction. The 5G wireless protocol stack is divided into two planes: a user plane (UP) protocol stack and a control plane (CP) protocol stack. The user plane protocol stack is the protocol cluster adopted by user data transmission, and the control plane protocol stack is the protocol cluster adopted by the control signaling transmission of the 5G system. The names of the layers of each protocol stack are as follows:

[0102] As shown in FIG. 4A , the user plane protocol stack includes, from top to bottom, a service data adaptation protocol (SDAP) layer, a packet data convergence protocol (PDCP) layer, a radio link control (RLC) layer, a medium access control (MAC) layer, and a physical (PHY) layer. Among them, the SDAP layer is optional, and there is no SDAP layer in LTE.

[0103] As shown in FIG. 4B , the control plane protocol stack includes, from top to bottom, a non-access stratum (NAS), a radio resource control (RRC) layer, a PDCP layer, an RLC layer, a MAC layer, and a PHY layer.

[0104] It should be understood that different layers in the above protocol stack have different functions, and the communication function between the terminal device and the network device is realized through the interaction between the layers. With the development of artificial intelligence technology, artificial intelligence assisted computing functions have penetrated into the processing implementation method of the above protocol stack, such as the scheduling algorithm of the MAC layer and the encoding and decoding algorithm of the PHY layer, which can apply artificial intelligence algorithms to improve the performance of the communication algorithm.

[0105] As an embodiment, FIG. 4A and FIG. 4BThe wireless protocol architecture described herein is applicable to the first node in this application.

[0106] As an example, FIG. 4A and FIG. 4B The wireless protocol architecture described herein is applicable to the second node in this application.

[0107] It should be understood that some functionalities in a wireless protocol architecture can also be implemented in one or more devices. For example, the functions of different layers in the control plane protocol stack can be implemented by multiple nodes on the network side.

[0108] It should be understood that the interpretation of the terminology in the embodiments of this application may refer to the TS36, TS37 and TS38 series of specifications of the 3rd generation partnership project (3GPP), but may also refer to the specifications of the Institute of Electrical and Electronics Engineers (IEEE).

[0109] Redirection techniques

[0110] Redirection technology is an important access control mechanism in mobile communication systems, mainly used to guide terminals from their currently connected cell or frequency band to a more suitable target cell, frequency band, or access technology (such as switching from 4G to 5G). This process is usually initiated by the network side by sending an "RRC connection release message" with redirection information, so that after the terminal disconnects its current connection, it can reselect and access the target network according to the prompt information.

[0111] Redirection technology is widely used in various scenarios, including initial access guidance, inter-system frequency migration, load balancing scheduling, network optimization, and network fallback strategies. Unlike traditional handover mechanisms, redirection does not maintain connection continuity, offering advantages such as simplicity, high flexibility, and lower dependence on network resources. Especially during network congestion or cell overload, redirection can effectively distribute the load and improve resource utilization efficiency, making it a crucial supporting technology for building efficient and intelligent wireless access networks.

[0112] TSR-UE

[0113] Traffic Situation Reporting UE (TSR-UE) refers to vehicles or devices equipped with various sensors (such as cameras, lidar, millimeter wave radar, etc.). Its main task is to continuously perceive the surrounding environment and traffic conditions (for example: discovering road construction ahead, detecting obstacles on the road, seeing traffic accidents, perceiving pedestrians suddenly crossing the road, etc.), and processing and packaging these perceived information, then reporting to the network side (such as edge server or central platform) through 5G network. In simple analogy, TSR-UE is like a "mobile lookout" or "intelligence collection vehicle" on the road, responsible for collecting first-hand road condition information and reporting to the superior.

[0114] CL-UE

[0115] Cooperative Lane Merge UE (CL-UE) refers to vehicles that have specific cooperative driving operation needs. For example, a vehicle wants to merge, change lanes on the highway, or merge into traffic at a road intersection without traffic lights. It will actively send a high-priority, low-latency cooperative request to the network side. This request will contain information such as its intention, location, speed, etc. After receiving this request, the network side will quickly allocate appropriate communication resources for it and accurately send the request to other vehicles related to the operation (such as the rear vehicle on the target lane), thereby coordinating the actions of multiple parties to ensure that the merging operation is safe and efficient. In simple analogy, CL-UE is like an "applicant coordinator". For example, a vehicle turns on the turn signal to change lanes, and the role of CL-UE is to not only turn on the light, but also to notify all relevant vehicles through a high-speed and reliable 5G network.

[0116] BSM-UE

[0117] Basic Safety Message UE (BSM-UE) BSM-UE refers to those vehicles or devices that periodically broadcast their own basic state information. These basic state information usually includes: real-time position, speed, acceleration, driving direction, steering wheel angle, vehicle size and brake state of the vehicle, etc. The purpose is to enable other vehicles and infrastructure around to clearly perceive the existence and dynamics of themselves, which is the core of realizing basic level cooperative perception. After receiving these broadcast messages, other UEs can build a surrounding traffic environment model, thereby avoiding collisions. In simple analogy, BSM-UE is like a vehicle that is "continuously reporting its own identity". Similar to a ship constantly sending radar signals ("I am here, this is my speed and direction"), other ships can discover and avoid it. This is a basic function that all connected vehicles should have.

[0118] As described above, considering the fast movement of satellite cells, NTN cell redirection is more difficult to succeed than ground redirection, and the lack of feedback mechanism causes the terminal to continuously search for the target cell, resulting in waste of resources.

[0119] The problems that can be solved by the embodiments of the present application include at least any one of the following:

[0120] 1) How to improve the success rate of the terminal from TN cell redirection to NTN cell?

[0121] 2) How to improve the success rate of the terminal from TN cell redirection to NTN cell while saving communication resources?

[0122] 3) How to optimize performance in the process of the terminal redirecting to the NTN cell?

[0123] It should be understood that different embodiments herein can solve one, some or all of the above problems.

[0124] To solve the above problems, the embodiments of the present application provide a method for wireless communication. In the method, the network device provides a plurality of candidate NTN cells for the terminal to redirect, thereby avoiding the terminal continuously searching for a single NTN cell, improving the success rate of terminal redirection, and also saving more communication resources.

[0125] FIG. 5 The flowchart of the wireless communication method provided by an embodiment of the present application is shown. FIG. 5 The method shown is described from the perspective of the first node interacting with the second node.

[0126] In some embodiments, the first node can be any type of terminal device mentioned above, which can be, for example, FIG. 3The terminal device 340 in FIG. 3.

[0127] In some embodiments, the second node can include an access network device, which can be a satellite device deploying a base station, for example, which can be a FIG. 3 The satellite 310 in FIG. 3.

[0128] In some other embodiments, the second node can include a network device, which can be a core network element, such as an MME network element or an AMF network element, etc. Of course, the network device can also be a gateway device, which can be a gateway or a user plane function (UPF) gateway (referred to as SGW), for example. The network device can be the gateway 350 or the network 360 in FIG. 3, for example. FIG. 3 The gateway 350 or the network 360 in FIG. 3.

[0129] FIG. 5 The method shown can include S510 to S520.

[0130] In S510, the first node receives first information. The first information is used to indicate at least one candidate NTN cell, which includes a target NTN cell.

[0131] In S520, the first node performs reselection or redirection to the target NTN cell based on the first information.

[0132] In a possible embodiment, the first information is associated with one or more of the following information of the candidate NTN cell: satellite ephemeris information, satellite carrier information, valid time of ephemeris information, and SSB-based measurement timing configuration (SMTC) information, NTN cell identification, load information of the carrier frequency of the satellite, satellite identification, network identification to which the satellite belongs, network identification to which the satellite cell belongs, operator identification to which the satellite belongs, or operator identification to which the satellite cell belongs.

[0133] In a possible embodiment, the value range of the load information can be 0-1, and the closer to 0 indicates the lighter the load, and the closer to 1 indicates the heavier the load.

[0134] In a possible embodiment, the at least one candidate NTN cell is related to or corresponds to the terminal type of the first node, or in other words, the at least one candidate NTN cell is determined based on a reference NTN cell set reported by the first node. In the scenario of vehicle networking or cellular network supporting automatic driving, the terminal type of the first node can include TSR-UE, CL-UE and BSM-UE. For the first information received by the CL-UE, the first information is determined according to a preferred NTN cell set (also referred to as a preferred NTN cell list) reported by the TSR-UE. For the first information received by the TSR-UE, the first information is determined according to a resolvable NTN cell set (also referred to as a resolvable NTN cell list) reported by the CL-UE.

[0135] Alternatively, the first information can be determined by the second node according to the capability information reported by the UE, and the capability information reported by the UE can include at least one of the following: a resolvable NTN cell list, a non-resolvable NTN cell list, a resolvable carrier list, a non-resolvable carrier list, a resolvable Band list, a non-resolvable Band list, a resolvable network number, a non-resolvable network number, resolvable radio access technology (RAT) information, and non-resolvable RAT information.

[0136] In a possible embodiment, the base station where the TN cell is located can obtain the capability information from a core network control node. In the LTE system, the core network control node is an MME; in the 5G system, the core network control node is an AMF.

[0137] In a possible embodiment, the base station where the TN cell is located can obtain the capability information from a core network control node. In the LTE system, the core network control node is an MME; in the 5G system, the core network control node is an AMF.

[0138] Table 1

[0139]

[0140] In the above table, the UE of the three terminal types can all receive the measurement configuration from the network side, and when detecting that the serving cell signal quality is lower than the preset threshold, trigger the reporting of the channel measurement report and the positioning information (also referred to as the location information) to the eNB / gNB. For example, the UE reports the location information through the measurement report (MeasurementReport), and can also receive a request message from the network side, the request being used to request the location information of the terminal, and in response to the request, the terminal reports its own location information through other signaling. These contents will assist the base station in making redirection decisions for the UE. Optionally, for the TSR-UE and the CL-UE, when sending a request to the base station to be redirected to the NTN satellite cell, an additional supported NTN cell list needs to be reported, which is used to assist the base station in making redirection decisions.

[0141] That is, for the UE that needs to be redirected to the NTN cell, the second node can perform differentiated processing according to different terminal types corresponding to different UEs, and decide to generate a redirection cell whitelist. Optionally, the UE can also be redirected to a cell outside the whitelist, and the redirection cell whitelist can be understood as a preferred NTN cell.

[0142] For example, for the CL-UE, because the CL-UE actively reports the supported NTN cell list to the base station, and can only be redirected to the cells in the cell list, the base station forms the redirection cell whitelist according to the supported NTN cell list in combination with the redirection strategy such as the stored carrier information of the base station.

[0143] For example, for the TSR-UE, because the TSR-UE wants to preferentially camp in the cells in the preferred NTN cell list, the second node forms the redirection cell whitelist by giving priority to the preferred NTN cell list according to the stored carrier information and other redirection strategies of the second node.

[0144] For example, for the BSM-UE, because the redirection of the BSM-UE has no restriction condition, the second node forms the redirection cell whitelist according to the stored carrier information, load and other redirection strategies of the second node.

[0145] In a possible embodiment, for the UE that needs to be redirected to the NTN cell, the second node can perform differentiated processing according to the terminal types corresponding to different UEs, and decide to generate a redirection cell blacklist. In this way, the UE will not be redirected to the NTN cell in the blacklist, so as to reduce the probability of redirection failure.

[0146] In a possible embodiment, the first information can be carried in RRC signaling, a system broadcast message, an RRC release (RRCRelease or RRCConnectionRelease) message. The NTN cell time search information (NtnTimeSearchInfo) is included in the RRCRelease / RRCConnectionRelease message, or the first information is the NtnTimeSearchInfo.

[0147] The basic message structure of the RRCConnectionRelease is shown in Table 2.

[0148] Table 2

[0149]

[0150] The redirection carrier information is the carrier information corresponding to each satellite in the NTN cell time search information (NtnTimeSearchInfo), which is used to indicate that the UE can search for the corresponding satellite or NTN cell according to the corresponding frequency within the valid time range for synchronization, as shown in Table 3.

[0151] Table 3

[0152] [CAT 11 ~T 12 ]] [CAT 21 ~T 22 ]] … T N1 ~T N2 ]] Carrierlnfo1 Carrierlnfo2 … CarrierlnfoN

[0153] Wherein, Ti1~Ti2 refers to the valid time range, Ti1 represents the search start time of the UE, Ti2 represents the search stop time of the UE, CarrierInfoi is the carrier frequency corresponding to the satellite within Ti1~Ti2, i is a positive integer, and N is a positive integer greater than 1. Ti1~Ti2 can be represented by the SFN of the TN cell, or can be represented by absolute time.

[0154] In addition, the base station generates NtnTimeSearchInfo information and broadcasts it in the TN cell through system broadcast, which contains stored ephemeris information, cell-specific timing information, Doppler shift pre-compensation information, valid SMTC configuration, satellite / cell identification information, etc. The UE can perform redirection search according to the corresponding ephemeris information and SMTC configuration within the valid time. The content of the NtnTimeSearchInfo can be shown in Table 4, for example.

[0155] Table 4

[0156] [CAT 11 ~T 12 ]] [CAT 21 ~T 22 ]] … [CAT N1 ~T N2 ]] Source1 Source2 … SourceN

[0157] Wherein, Ti1~Ti2 refers to the effective time range, Ti1 represents the search start time of the UE, Ti2 represents the search stop time of the UE, and N is a positive integer greater than 1. Sourcei is the ephemeris information and SMTC configuration corresponding to the satellite at Ti1~Ti2. The SMTC configuration is used by the first node to search for the SSB signal of the target cell within the effective time range. Optionally, T 11 ~T 12 、T 21 ~T 22 、…、T N1 ~T N2 These time periods are relatively independent in the time domain, that is, none of them overlaps each other. Alternatively, T 11 ~T 12 、T 21 ~T 22 、…、T N1 ~T N2 These time periods overlap in the time domain, or there is a containing relationship between some of the time periods.

[0158] In one possible embodiment, after the first node receives the RRCRelease / RRCConnectionRelease message, the NtnTimeSearchInfo information therein is parsed. The first node detects the SSB signal of the corresponding satellite and measures the RSRP of the SSB signal within the corresponding time window according to the effective SMTC time indicated by NtnTimeSearchInfo. The UE finds the corresponding ephemeris information and carrier information according to the indicated effective time, and initiates the synchronization process. If the RSRP of the SSB signal broadcast by the satellite of the target NTN cell meets the requirements, the UE camps on the target NTN cell. If the requirements are not met, or the SSB signal corresponding to the satellite cannot be searched within the time period given in the above table, the UE searches for the next satellite according to the SMTC information and ephemeris information of the next satellite in NtnTimeSearchInfo. Alternatively, the UE can blindly search for the NTN cell until the next time window arrives, and then search for the NTN cell according to the Sourcei information within the next time window provided by the TN cell.

[0159] In a possible embodiment, after receiving the NtnTimeSearchlnfo information from the second node, the first node can save the ephemeris information of other satellites in the NtnTimeSearchlnfo, and the first node can further search other NTN cells using the ephemeris information, for redirection, reselection, and handover between NTN cells, where the second node can be a base station, an OAM, or an AMF. In addition, after the UE searches or camps on an NTN cell, the UE starts to receive the SIB message broadcast by the NTN cell, and / or indication information indicating the ephemeris information of neighboring NTN satellites. If the information of the neighboring NTN cell broadcast by the satellite is different from the information provided in the NtnTimeSearchlnfo, or when the validity time of the ephemeris information in the NtnTimeSearchlnfo expires, the UE can update the stored ephemeris information according to the latest ephemeris information broadcast by the NTN cell; otherwise, if the NTN cell does not indicate the ephemeris information of the neighboring NTN satellite, the UE can continue to use the stored ephemeris information.

[0160] In a possible embodiment, in S510, the second node generates the first information, and then the first node obtains the first information from the second node.

[0161] For example, the second node can calculate a set of NTN cells covering the TN cell according to the positioning information and the time window, and send an NTN information request (NTN Info Request) message to the AMF or the network management platform, to request to query the ephemeris information, carrier information, and other necessary information of all satellites in the NTN satellite set. For example, the necessary information mainly includes the carrier information of multiple satellites (or multiple candidate cells), the satellite ephemeris information, and the corresponding validity time thereof.

[0162] The following further describes the main parameter information associated with the first information.

[0163] (1) Satellite ephemeris information

[0164] The ephemeris information of a satellite can be represented by a position vector and a velocity vector, and the coordinate system of the satellite can be an earth-centered earth-fixed (ECEF) coordinate system. The position vector includes the contents shown in Table 5, and the velocity vector includes the contents shown in Table 6.

[0165] Table 5

[0166] Field Unit Step Actual value positionX meter (m) 1.3 Field value x 1.3 positionY meter (m) 1.3 Field value x 1.3 positionZ meter (m) 1.3 Field value x 1.3

[0167] Table 6

[0168]

[0169]

[0170] Optionally, the position vector and the velocity vector indicate the basic motion trajectory of the satellite within the valid time range, and the UE can calculate the position information of the satellite at a certain time within the valid time according to the state vector.

[0171] In another possible implementation, the ephemeris information can also be indicated in the form of satellite orbit parameters, as shown in Table 7.

[0172] Table 7

[0173]

[0174] Since the above parameters are encoded in a specific step and unit, the UE can calculate the actual value through the field value, and thus derive the orbit state of the satellite.

[0175] (2) Valid time (valid period of satellite ephemeris data and common TA parameters of the satellite):

[0176] The valid time indicates the maximum time during which the satellite ephemeris data can be applied without acquiring new ephemeris data. Since the valid time of the satellite is calculated from the epoch time, the necessary information acquired includes the epoch time of the satellite. The network device can calculate the real time corresponding to the valid time according to the valid time and the epoch time. The network device can notify the UE of the real time.

[0177] (3) SSB-based measurement timing configuration (SMTC)

[0178] The SMTC information is a kind of configuration information. The SMTC information can include a period, an offset, and a duration. When accessing the satellite, the UE needs to search for the SSB signal broadcast by the satellite within the corresponding time window, including the time window position at which the satellite broadcasts the SSB signal within the period. The network device can generate the SMTC information of the UE according to the SSB information and the transmission delay, and notify the UE of the SMTC information. The SMTC information can take the system frame number (SFN) of the evolved universal terrestrial radio access network (E-UTRAN) as a time reference, and notify the SMTC window information.

[0179] In order to more systematically describe the above cell redirection process, the following describes the cell redirection process in combination with the above-mentioned satellite ephemeris information. FIG. 6Take CLE-UE as an example to systematically illustrate.

[0180] FIG. 6 The cell redirection procedure shown includes S610 to S690.

[0181] First stage measurement reporting

[0182] S610, the CLE-UE reports a measurement report to the currently serving TN cell according to the measurement configuration issued by the network when the trigger condition is met.

[0183] Optionally, the trigger condition can include a trigger event, which can include at least one of the following conditions:

[0184] The signal quality of the serving cell is higher than an absolute threshold, and the serving cell is a terrestrial cell currently accessed by the first node;

[0185] The signal quality of the serving cell is lower than or equal to the absolute threshold;

[0186] The difference between the signal quality of the intrasystem neighbor cell of the serving cell and the signal quality of the serving cell is higher than a relative threshold;

[0187] The signal quality of the intrasystem neighbor cell is higher than the absolute threshold;

[0188] The signal quality of the intrasystem neighbor cell is higher than the absolute threshold, and the signal quality of the serving cell is lower than the absolute threshold;

[0189] The signal quality of the intersystem neighbor cell of the serving cell is higher than the absolute threshold;

[0190] The signal quality of the serving cell is lower than the absolute threshold, and the signal quality of the intersystem neighbor cell is higher than the absolute threshold.

[0191] Optionally, the intersystem includes NTN, and further, the intersystem can include one or more of GEO, MEO, LEO, UAV, etc.

[0192] S620, the CLE-UE reports its own location information through the measurement report, or the UE reports its own location information through the request response (UEInformationResponse) according to the request of the network side.

[0193] S630, the CLE-UE actively reports a list of NTN cells that can be camped to the TN cell, for assisting the TN cell redirection decision.

[0194] It is worth noting that if the CLE-UE acquires NTN cell information through system information broadcast, S610 and S620 do not need to be performed.

[0195] Second stage: Obtain cell information

[0196] S640, the TN cell calculates the NTN satellite set covering the TN cell according to the positioning information and the time window, and then sends a request (NTN Info Request) to the AMF to request the ephemeris information, carrier information and other necessary information of all satellites in the NTN satellite set.

[0197] S650, the AMF returns the satellite-related data to the TN cell after obtaining the satellite-related data from the UDR, and the TN cell stores the information.

[0198] It should be understood that the TN cell can periodically repeat S640 and S650 to update the stored information.

[0199] The satellite-related data obtained by the TN cell mainly includes satellite ephemeris information, satellite carrier information, valid time of ephemeris information, SMTC configuration and the like.

[0200] Third stage: Generate redirection decision

[0201] S660, the TN cell generates a redirection decision according to the NTN cell list (supportedNTN-CellList) uploaded by the CL-UE, in combination with the stored satellite-related data.

[0202] S670, the TN cell generates an RRCRelease / RRCConnectionRelease message based on the redirection decision, and the RRCRelease / RRCConnectionRelease message includes the first information.

[0203] Fourth stage: Perform redirection

[0204] S680, the TN cell sends the RRCRelease / RRCConnectionRelease message to the CL-UE and broadcasts the NtnTimeSearchInfo message.

[0205] S690, the CL-UE parses the RRCRelease / RRCConnectionRelease message, searches and redirects to the target NTN cell.

[0206] Specifically, the CLE-UE receives the NtnTimeSearchInfo message broadcast by the TN cell, detects the SSB signal of the corresponding satellite in the corresponding time window according to the valid time indicated by the NtnTimeSearchInfo, and measures the signal quality of the SSB signal. The CLE-UE acquires the corresponding ephemeris information and carrier information according to the indicated valid time, initiates a synchronization process to the target NTN cell, performs SSB measurement, and searches for or camps on the target NTN cell if the signal quality of the SSB signal broadcast by the satellite of the target NTN cell meets the requirements. Otherwise, if the signal quality of the SSB signal broadcast by the satellite of the target NTN cell does not meet the requirements, or the SSB signal corresponding to the satellite cannot be searched for within a period of time, the CLE-UE searches for the next satellite according to the SMTC configuration and ephemeris information of the next satellite in the NtnTimeSearchInfo.

[0207] It should be understood that after the CLE-UE receives the NtnTimeSearchInfo, the ephemeris information of other satellites in the NtnTimeSearchInfo can be saved, and the CLE-UE can use these ephemeris information to further search for other NTN cells for redirection, reselection, and handover between NTN cells. At the same time, after the UE accesses the NTN cell, it starts to receive the SIB message broadcast by the NTN cell and the ephemeris information of other NTN satellites indicated thereby. If the information of the NTN neighbor cell broadcast by the satellite is different from the information provided in the NtnTimeSearchInfo, or when the valid time of the ephemeris information in the NtnTimeSearchInfo expires, the UE can update the stored ephemeris information according to the latest ephemeris information broadcast by the NTN cell.

[0208] In summary, the terminal can obtain information of multiple NTN candidate cells, thereby helping to provide the probability of success of terminal redirection. Compared with the traditional redirection process, when only the information of one satellite is included in the NtnTimeSearchInfo, if the UE fails to search, the redirection process cannot continue, and the UE can only repeatedly search for the satellite or perform blind search, which can cause the UE to wait for a long time and affect the quality of communication. In the present application, the network side provides information of multiple satellites in multiple time periods, which can provide the UE with more opportunities for selection and achieve better communication effect. Furthermore, after the terminal is redirected to the NTN cell, the ephemeris information of other satellites in the NtnTimeSearchInfo provided by the network side can be saved. If the terminal accesses the satellite and finds that the communication quality of the current satellite does not meet the requirements, or the motion trajectory of the current satellite and the position of the UE gradually deviate, causing the communication quality to gradually decrease, the saved ephemeris information of other satellites can be used to perform redirection, switching or reselection between NTN cells, so as to achieve better communication effect.

[0209] The method embodiments of the present application are described in detail above in combination with FIG. 1 to FIG. 6 The method embodiments of the present application are described in detail above in combination with FIG. 1 to FIGS. 7-10 The device embodiments of the present application are described in detail below. It should be understood that the description of the device embodiments corresponds to the description of the method embodiments, and therefore, the parts not described in detail can be referred to the foregoing method embodiments.

[0210] FIG. 7 FIG. 7 is a structural schematic diagram of a first node for wireless communication according to an embodiment of the present application. FIG. 7 The first node 700 shown in FIG. 7 can be any terminal described above. The first node 700 can include a first transceiver 710 and a first processing unit 720.

[0211] In an embodiment, the first transceiver 710 is configured to receive first information, the first information being used to indicate at least one candidate non-terrestrial network (NTN) cell; wherein the at least one candidate NTN cell includes a target NTN cell.

[0212] The first processing unit 720 is configured to perform reselection or redirection to the target NTN cell based on the first information, the first information being related to one or more of the following information of the candidate NTN cell:

[0213] Satellite ephemeris information;

[0214] Satellite carrier information;

[0215] Valid time of the ephemeris information;

[0216] Synchronization signal block-based measurement timing configuration information;

[0217] NTN cell identity;

[0218] Satellite carrier frequency load information;

[0219] Satellite identity;

[0220] Satellite network identity;

[0221] Satellite cell network identity;

[0222] Satellite operator identity;

[0223] Satellite cell operator identity.

[0224] In an embodiment, the first transceiver 710 is further configured to send a reference NTN cell set, the reference NTN cell set being a set of NTN cells preferred by the first node or a set of NTN cells in which the first node is capable of camping.

[0225] In an embodiment, the at least one candidate NTN cell is determined based on the reference NTN cell set.

[0226] In an embodiment, the first transceiver 710 is further configured to send a measurement report and positioning information of the first node.

[0227] In an embodiment, the first transceiver 710 is further configured to receive a request message, the request message being used to request positioning information of the first node.

[0228] As an embodiment, the first transceiver 710 can be a transceiver 930, and the first processing unit 720 can be a processor 910, and the first node 700 can further include a memory 920, as shown in FIG. 9 .

[0229] FIG. 8 FIG. 8 is a structural diagram of a second node for wireless communication according to an embodiment of the present application. FIG. 8 As shown in FIG. 8, the second node 800 can be a ground base station or a satellite base station as described above. The second node 800 can include a second transceiver 810.

[0230] In an embodiment, the second transceiver 810 is configured to send first information, the first information being used to assist the first node to perform reselection or redirection to a target non-terrestrial network (NTN) cell, the first information being used to indicate at least one candidate NTN cell; wherein the at least one candidate NTN cell includes a target NTN cell; and the first information is related to one or more of the following information of the candidate NTN cell:

[0231] Satellite ephemeris information;

[0232] Satellite carrier information;

[0233] Valid time of ephemeris information;

[0234] Measurement timing configuration information based on synchronization signal block;

[0235] NTN cell identity;

[0236] Load information of carrier frequency of satellite;

[0237] Satellite identity;

[0238] Network identity to which the satellite belongs;

[0239] Network identity to which the satellite cell belongs;

[0240] Operator identity to which the satellite belongs;

[0241] Operator identity to which the satellite cell belongs.

[0242] In an embodiment, the second transceiver 810 is configured to receive a reference NTN cell set, the reference NTN cell set being a set of NTN cells preferred by the first node or a set of NTN cells in which the first node is capable of camping;

[0243] In an embodiment, the second processing unit 820 is further configured to determine the at least one candidate NTN cell based on NTN cell information stored by the second node for the reference NTN cell set.

[0244] In an embodiment, the at least one candidate NTN cell is determined based on the reference NTN cell set.

[0245] In an embodiment, the second transceiver 810 is further configured to receive a measurement report and positioning information of the first node.

[0246] In an embodiment, the second transceiver 810 is further configured to send a request message, the request message being used to request the positioning information of the first node.

[0247] As an embodiment, the second transceiver 810 can be a transceiver 930, and the second processing unit 820 can be a processor 910, and the second node 800 can further include a memory 920, as shown in FIG. 9 .

[0248] FIG. 9 is a schematic structural diagram of a communication device according to an embodiment of the present application. FIG. 9The dashed line in the figure indicates that the unit or module is optional. The apparatus 900 can be used to implement the methods described in the above method embodiments. The apparatus 900 can be a chip, a user equipment or a network device.

[0249] The apparatus 900 can include one or more processors 910. The processor 910 can support the apparatus 900 to implement the methods described in the foregoing method embodiments. The processor 910 can be a general processor or a dedicated processor. For example, the processor can be a central processing unit (CPU). Alternatively, the processor can also be other general processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general processor can be a microprocessor or the processor can also be any conventional processor.

[0250] The apparatus 900 can also include one or more memories 920. The memory 920 stores programs, which can be executed by the processor 910, so that the processor 910 performs the methods described in the foregoing method embodiments. The memory 920 can be independent of the processor 910 or integrated in the processor 910.

[0251] The apparatus 900 can also include a transceiver 930. The processor 910 can communicate with other devices or chips through the transceiver 930. For example, the processor 910 can perform data transceiving with other devices or chips through the transceiver 930.

[0252] FIG. 10 The hardware module schematic diagram of the communication device provided for the embodiments of the present application is shown. Specifically, FIG. 10 A block diagram of a first communication device 1050 and a second communication device 1010 in communication with each other in an access network is shown.

[0253] The first communication device 1050 includes a controller / processor 1059, a memory 1060, a data source 1067, a transmission processor 1068, a reception processor 1056, a multi-antenna transmission processor 1057, a multi-antenna reception processor 1058, a transmitter / receiver 1054 and an antenna 1052.

[0254] The second communication device 1010 includes a controller / processor 1075, a memory 1076, a data source 1077, a receive processor 1070, a transmit processor 1016, a multi-antenna receive processor 1072, a multi-antenna transmit processor 1071, a transmitter / receiver 1018, and antennas 1020.

[0255] In the transmission from the second communication device 1010 to the first communication device 1050, at the second communication device 1010, upper layer packets from a core network or upper layer packets from the data source 1077 are provided to the controller / processor 1075. The core network and the data source 1077 represent all protocol layers above the L2 layer. The controller / processor 1075 implements the functionality of the L2 layer. In the transmission from the second communication device 1010 to the first communication device 1050, the controller / processor 1075 provides header compression, ciphering, packet segmentation and reordering, multiplexing between logical and transport channels, and radio resource allocations for the first communication device 1050 based on various priority metrics. The controller / processor 1075 is also responsible for retransmission of lost packets, and signaling to the first communication device 1050. The transmit processor 1016 and the multi-antenna transmit processor 1071 implement various signal processing functions for the LI layer (i.e., physical layer). The transmit processor 1016 implements coding and interleaving to facilitate forward error correction at the second communication device 1010, and mapping of data packets onto signal constellations based on various modulation schemes (e.g., binary phase-shift keying, quadrature phase-shift keying, M-phase-shift keying, M-quadrature amplitude modulation). The multi-antenna transmit processor 1071 performs digital spatial precoding of the coded and modulated symbols, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, generating one or more spatial streams. The transmit processor 1016 then maps to each spatial stream to subcarriers, multiplexes with reference signals (e.g., pilots) in the time and / or frequency domain, and then performs an inverse fast Fourier transform to produce a time-domain multicarrier symbol stream for the physical channel. The multi-antenna transmit processor 1071 then performs transmit analog precoding / beamforming operations on the time-domain multicarrier symbol stream. Each transmitter 1018 converts the baseband multicarrier symbol stream provided by the multi-antenna transmit processor 1071 into a radio frequency stream, and then provides the radio frequency stream to the different antennas 1020.

[0256] In the transmission from the second communication device 1010 to the first communication device 1050, at the first communication device 1050, each receiver 1054 receives a signal through its respective antenna 1052. Each receiver 1054 recovers information modulated onto an RF carrier and converts the RF stream into a baseband multicarrier symbol stream, which provides to the receive processor 1056. The receive processor 1056 and the multi-antenna receive processor 1058 implement various signal processing functions of the LI layer. The multi-antenna receive processor 1058 performs receive analog precoding / beamforming operation on the baseband multicarrier symbol stream from the receivers 1054. The receive processor 1056 converts the baseband multicarrier symbol stream from the receive analog precoding / beamforming operation from the time domain to the frequency domain using a fast Fourier transform. In the frequency domain, the physical layer data signals and the reference signals are demultiplexed by the receive processor 1056, where the reference signals will be used for channel estimation, and the data signals are recovered after multi-antenna detection in the multi-antenna receive processor 1058 for any spatial streams destined for the first communication device 1050. The symbols on each spatial stream are demodulated and recovered by the receive processor 1056 and generate soft decisions. The receive processor 1056 then decodes and de-interleaves the soft decisions to recover the upper layer data and control signals transmitted by the second communication device 1010 on the physical channels. The upper layer data and control signals are then provided to the controller / processor 1059. The controller / processor 1059 implements the functions of the L2 layer. The controller / processor 1059 can be associated with a memory 1060 that stores program codes and data. The memory 1060 can be referred to as a computer readable medium. In the transmission from the second communication device 1010 to the first communication device 1050, the controller / processor 1059 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the second communication device 1010. The upper layer data packets are then provided to all protocol layers above the L2 layer. Various control signals can also be provided to the L3 for L3 processing.

[0257] In the transmission from the first communication device 1050 to the second communication device 1010, at the first communication device 1050, upper layer data packets are provided to a controller / processor 1059 using a data source 1067. The data source 1067 represents all protocol layers above the L2 layer. Similar to the transmit function described at the second communication device 1010 in the transmission from the second communication device 1010 to the first communication device 1050, the controller / processor 1059 implements header compression, ciphering, packet segmentation and reordering, and multiplexing between logical and transport channels, L2 layer functionality for the user plane and the control plane. The controller / processor 1059 is also responsible for error detection, retransmission of lost packets, and signaling to the second communication device 1010. A transmit processor 1068 performs modulation mapping, channel coding processing, and a multi-antenna transmit processor 1057 performs digital multi-antenna spatial precoding, including codebook-based precoding and non-codebook-based precoding, and beamforming processing, and then the transmit processor 1068 modulates the generated spatial streams into multi-carrier / single-carrier symbol streams, which are provided to different antennas 1052 via transmitters 1054 after analog precoding / beamforming operations in the multi-antenna transmit processor 1057. Each transmitter 1054 first converts the baseband symbol stream provided by the multi-antenna transmit processor 1057 into a radio frequency signal, and then provides the radio frequency signal to the antenna 1052.

[0258] In the transmission from the first communication device 1050 to the second communication device 1010, the functions at the second communication device 1010 are similar to the receive functions described at the first communication device 1050 in the transmission from the second communication device 1010 to the first communication device 1050. Each receiver 1018 receives a radio frequency signal through its respective antenna 1020, converts the received radio frequency signal into a baseband signal, and provides the baseband signal to a multi-antenna receive processor 1072 and a receive processor 1070. The receive processor 1070 and the multi-antenna receive processor 1072 collectively implement the functions of the Ll layer. A controller / processor 1075 implements the L2 layer functionality. The controller / processor 1075 can be associated with a memory 1076 that stores program codes and data. The memory 1076 can be referred to as a computer readable medium. In the transmission from the first communication device 1050 to the second communication device 1010, the controller / processor 1075 provides demultiplexing between transport and logical channels, packet reassembly, deciphering, header decompression, control signal processing to recover upper layer data packets from the first communication device 1050. The upper layer data packets from the controller / processor 1075 can be provided to the core network or all protocol layers above the L2 layer, and various control signals can also be provided to the core network or L3 for L3 processing.

[0259] As an embodiment, the first communication device 1050 comprises at least one processor and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the first communication device 1050 to perform at least: receive the first information, the first information being used for indicating at least one candidate non-terrestrial network, NTN, cell; wherein the at least one candidate NTN cell comprises a target NTN cell;

[0260] perform reselection or redirection to the target NTN cell based on the first information.

[0261] As an embodiment, the first communication device 1050 corresponds to a terminal in the present application.

[0262] As an embodiment, the second communication device 1010 corresponds to a ground base station or a satellite base station in the present application.

[0263] As an embodiment, the first communication device 1050 is a NCR.

[0264] As an embodiment, the first communication device 1050 is a wireless repeater.

[0265] As an embodiment, the first communication device 1050 is a relay.

[0266] As an embodiment, the first communication device 1050 is a user equipment which can act as a relay node.

[0267] As an embodiment, the first communication device 1050 is a user equipment supporting V2X which can act as a relay node.

[0268] As an embodiment, the first communication device 1050 is a user equipment supporting D2D which can act as a relay node.

[0269] As an embodiment, the second communication device 1010 is a base station.

[0270] As an embodiment, the antenna 1052, the receiver 1054, the multi-antenna reception processor 1058, the reception processor 1056, the controller / processor 1059 are used for receiving the first information in the present application.

[0271] As an embodiment, the antenna 1020, the transmitter 1018, the multi-antenna transmission processor 1071, the transmission processor 1016, the controller / processor 1075 are used for transmitting the first information in the present application.

[0272] An embodiment of the present application further provides a computer readable storage medium for storing a program. The computer readable storage medium can be applied to the terminal or the network device provided by the embodiment of the present application, and the program causes the computer to execute the method performed by the terminal or the network device in the various embodiments of the present application.

[0273] An embodiment of the present application further provides a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal or the network device provided by the embodiment of the present application, and the program causes the computer to execute the method performed by the terminal or the network device in the various embodiments of the present application.

[0274] An embodiment of the present application further provides a computer program. The computer program can be applied to the terminal or the network device provided by the embodiment of the present application, and the computer program causes the computer to execute the method performed by the terminal or the network device in the various embodiments of the present application.

[0275] It should be understood that the terms "system" and "network" can be used interchangeably in the present application. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0276] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication with an associated relationship. For example, A indicates B, which can mean that B can be obtained by A; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0277] In the embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0278] In the embodiments of the present application, the term "corresponding" can mean that there is a direct or indirect corresponding relationship between the two, or can mean that there is an associated relationship between the two, or can mean an indication and being indicated, configuration and being configured, and the like.

[0279] In the embodiments of the present application, the "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables or other manners that can be used to indicate relevant information in devices (for example, including user equipment and network equipment), and the specific implementation manners are not limited in the present application. For example, the predefinition can refer to the definition in the protocol.

[0280] In the embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, for example, can include the LTE protocol, the NR protocol and the related protocol applied to the future communication system, and the present application is not limited to this.

[0281] In the embodiments of the present application, the term "and / or" is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents that the front and rear associated objects are in an "or" relationship.

[0282] In various embodiments of the present application, the size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0283] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other ways. For example, the device embodiments described above are only schematic, and the division of the units is only a logical function division, and there can be another division way in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0284] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0285] In addition, each functional unit in each embodiment of the present application can be integrated into a processing unit, or each unit can exist physically, or two or more units can be integrated into one unit.

[0286] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments can be implemented 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, all or part of the processes or functions described in the embodiments of the present application are generated. The computer can be a general purpose computer, a special purpose computer, a computer network, or other programmable devices. 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 through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. 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, data center and the like integrated with one or more available media sets. The available media can be magnetic media (for example, floppy disk, hard disk, magnetic tape), optical media (for example, digital video disc (DVD)) or semiconductor media (for example, solid state disk (SSD)) and the like.

[0287] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for a first node in wireless communication, characterized in that, include: Receive first information, the first information being used to indicate at least one candidate non-terrestrial network (NTN) cell; wherein, the at least one candidate NTN cell includes a target NTN cell; Based on the first information, a reselection or redirection to the target NTN cell is performed, wherein the first information is related to one or more of the following information of the candidate NTN cell: Satellite ephemeris information; Satellite carrier information; The validity period of ephemeris information; Measurement timing configuration information based on synchronization signal blocks; NTN cell signage; The payload information of the satellite's carrier frequency; Satellite identifier; The network identifier to which the satellite belongs; The network identifier of the satellite cell; The identifier of the satellite's operator; The operator's identifier for the satellite cell.

2. The method according to claim 1, characterized in that, Also includes: Send a reference NTN cell set, which is either the NTN cell set preferred by the first node or the NTN cell set that the first node can camp on.

3. The method according to claim 2, characterized in that, The at least one candidate NTN cell is determined based on the reference NTN cell set.

4. The method according to any one of claims 1 to 3, characterized in that, Also includes: Send the measurement report and the location information of the first node.

5. The method according to claim 4, characterized in that, Also includes: A request message is received, which is used to request the location information of the first node.

6. The method according to any one of claims 1 to 5, characterized in that, The first information is carried in RRC signaling, system broadcast messages, or RRC release messages.

7. The method according to any one of claims 1 to 6, characterized in that, The at least one candidate cell includes N candidate cells, where N is a positive integer greater than 1.

8. A method for a second node in wireless communication, characterized in that, include: A first message is sent, which is used to assist the first node in performing a reselection or redirection to a target non-terrestrial network (NTN) cell. This first message indicates at least one candidate NTN cell; wherein the at least one candidate NTN cell includes the target NTN cell; and the first message is associated with one or more of the following information of the candidate NTN cell: Satellite ephemeris information; Satellite carrier information; The validity period of ephemeris information; Measurement timing configuration information based on synchronization signal blocks; NTN cell signage; The payload information of the satellite's carrier frequency; Satellite identifier; The network identifier to which the satellite belongs; The network identifier of the satellite cell; The identifier of the satellite's operator; The operator's identifier for the satellite cell.

9. The method according to claim 8, characterized in that, Also includes: Receive a reference NTN cell set, wherein the reference NTN cell set is the NTN cell set preferred by the first node or the NTN cell set that the first node can camp on; The at least one candidate NTN cell is determined based on the NTN cell information stored in the second node of the reference NTN cell set.

10. The method according to claim 9, characterized in that, The at least one candidate NTN cell is determined based on the reference NTN cell set.

11. The method according to any one of claims 8 to 10, characterized in that, Also includes: Receive the measurement report and the positioning information of the first node.

12. The method according to claim 11, characterized in that, Also includes: A request message is sent, which is used to request the location information of the first node.

13. The method according to any one of claims 8 to 12, characterized in that, The first information is carried in RRC signaling, system broadcast messages, or RRC release messages.

14. The method according to any one of claims 8 to 13, characterized in that, The at least one candidate cell includes N candidate cells, where N is a positive integer greater than 1.

15. A communication device, characterized in that, Includes units or modules for performing the method as described in any one of claims 1-7 or 8-14.

16. A first node used for wireless communication, characterized in that, The device includes a transceiver, a memory, and a processor. The memory is used to store a program, and the processor is used to invoke the program in the memory and control the transceiver to receive or send signals so that the first node performs the method as described in any one of claims 1-7.

17. A second node used for wireless communication, characterized in that, It includes a transceiver, a memory, and a processor, wherein the memory is used to store a program, the processor is used to invoke the program in the memory, and to control the transceiver to receive or send signals so that the second node performs the method as described in any one of claims 8-14.

18. A communication device, characterized in that, Includes at least one processor; and One or more non-transitory computer-readable storage media, said one or more non-transitory computer-readable storage media coupled to said at least one processor and storing programming instructions executable by said at least one processor, said programming instructions, when executed, cause said at least one processor to perform the method as described in any one of claims 1-7, 8-14.

19. A chip, characterized in that, Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1-7 or 8-14.

20. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method as described in any one of claims 1-7 or 8-14.

21. A computer program product, characterized in that, Includes a program that causes a computer to perform the method as described in any one of claims 1-7 or 8-14.

22. A computer program, characterized in that, The computer program causes the computer to perform the method as described in any one of claims 1-7 or 8-14.

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