Method for wireless communication, satellite base station, terminal device, chip and storage medium

Abstract

The embodiment of the application discloses a kind of method for wireless communication, satellite base station, terminal equipment, chip and storage medium, after receiving the re-establishment request sent by terminal equipment, in the case where terminal equipment meets the trigger condition of network switching, switching request is sent to second satellite base station;After receiving the reconfiguration message sent by second satellite base station, first re-establishment signaling is generated;Wherein, first re-establishment signaling includes reconfiguration information;First re-establishment signaling is sent to terminal equipment, to make terminal equipment switch to second satellite base station.Terminal equipment receives the first re-establishment signaling sent by first satellite base station after sending re-establishment request to first satellite base station;Wherein, first re-establishment signaling includes the reconfiguration information of second satellite base station;According to reconfiguration information, switch to second satellite base station.

Description

Technical Field

[0001] This invention relates to the field of wireless communication technology, and in particular to a wireless communication method, satellite base station, terminal equipment, chip, and storage medium. Background Technology

[0002] Non-terrestrial networks (NTNs) have become a general term for any network involving non-terrestrial flying objects. Compared to traditional terrestrial networks, they typically employ technologies such as satellites and high-altitude platforms (HAPs) for network deployment. Taking satellite communication as an example, geosynchronous orbit (GEO) satellites theoretically only require three to cover the entire globe except for the polar regions, and their advantages are self-evident.

[0003] However, ground terminals in NTN networks may also trigger RRC re-establishment when radio link quality deteriorates. But considering that satellite base stations may be mobile, even if RRC re-establishment is successfully completed, measurement events may not be reported to the satellite base station in a timely manner, which may prevent the ground terminal from switching to the next satellite base station in time, causing the ground terminal to interrupt data transmission. Summary of the Invention

[0004] This application provides a wireless communication method, a satellite base station, a terminal device, a chip, and a storage medium. It fully considers the mobility of satellite base stations in NTN networks, solves the problem of data transmission interruption in some scenarios, and improves communication performance.

[0005] The technical solution of this application embodiment is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a wireless communication method, the method comprising:

[0007] After receiving a re-establishment request from the terminal device, if the terminal device meets the network handover triggering conditions, a handover request is sent to the second satellite base station.

[0008] After receiving the reconfiguration information sent by the second satellite base station, a first re-establishment signaling is generated; wherein, the first re-establishment signaling includes the reconfiguration information;

[0009] The first re-establishment signaling is sent to the terminal device so that the terminal device switches to the second satellite base station.

[0010] Secondly, embodiments of this application provide a wireless communication method, the method comprising:

[0011] After sending a re-establishment request to the first satellite base station, the system receives a first re-establishment signaling message from the first satellite base station; wherein the first re-establishment signaling message includes reconfiguration information of the second satellite base station.

[0012] Switch to the second satellite base station based on the reconfiguration information.

[0013] Thirdly, embodiments of this application provide a first satellite base station, which includes: a transmitting unit and a generating unit.

[0014] The sending unit is configured to send a handover request to the second satellite base station after receiving a re-establishment request from the terminal device, provided that the terminal device meets the network handover triggering conditions.

[0015] The generation unit is configured to generate a first re-establishment signaling after receiving the reconfiguration information sent by the second satellite base station; wherein the first re-establishment signaling includes the reconfiguration information;

[0016] The sending unit is further configured to send the first re-establishment signaling to the terminal device so that the terminal device switches to the second satellite base station.

[0017] Fourthly, embodiments of this application provide a first satellite base station, the first satellite base station comprising: a first processor and a first memory storing instructions executable by the first processor, wherein when the instructions are executed by the first processor, the method described in the first aspect is implemented.

[0018] Fifthly, embodiments of this application provide a terminal device, the terminal device comprising: a receiving unit, a switching unit,

[0019] The receiving unit is configured to receive a first re-establishment signaling sent by the first satellite base station after sending a re-establishment request to the first satellite base station; wherein the first re-establishment signaling includes reconfiguration information of the second satellite base station;

[0020] The switching unit is used to switch to the second satellite base station according to the reconfiguration information.

[0021] In a sixth aspect, embodiments of this application provide a terminal device, the terminal device comprising: a second processor and a second memory storing instructions executable by the second processor, wherein when the instructions are executed by the second processor, the method described in the second aspect is implemented.

[0022] In a seventh aspect, embodiments of this application provide a chip, the chip including programmable logic circuits and / or program instructions, which, when the chip is running, implement the method described in the first aspect or the method described in the second aspect.

[0023] Eighthly, embodiments of this application provide a computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which, when executed, implements the method described in the first aspect or the method described in the second aspect.

[0024] This application provides a wireless communication method, a satellite base station, a terminal device, a chip, and a storage medium. After receiving a re-establishment request from the terminal device, a first satellite base station, if the terminal device meets the network handover triggering conditions, sends a handover request to a second satellite base station. After receiving reconfiguration information from the second satellite base station, it generates a first re-establishment signaling message, which includes the reconfiguration information. The first re-establishment signaling message is sent to the terminal device to enable the terminal device to handover to the second satellite base station. After sending a re-establishment request to the first satellite base station, the terminal device receives the first re-establishment signaling message from the first satellite base station, which includes the reconfiguration information of the second satellite base station. It then hands over to the second satellite base station based on the reconfiguration information. Therefore, in the embodiments of this application, the first satellite base station can first determine whether the terminal device meets the handover triggering conditions. If the handover triggering conditions are met, the first satellite base station can send a handover request to the second satellite base station and generate a corresponding first re-establishment signaling using the reconfiguration information sent by the second satellite base station. After receiving the first re-establishment signaling sent by the first satellite base station, the terminal device can directly perform handover processing based on the reconfiguration information carried in the first re-establishment signaling to switch to the second satellite base station. In other words, in this application, by fully considering the mobility of satellite base stations in the NTN network, after an RRC re-establishment occurs and it is determined that the terminal device needs to perform network handover processing, the two RRC message flows of re-establishment signaling and reconfiguration information are merged into a single RRC signaling flow. This reduces the signaling interaction time after the terminal device undergoes RRC re-establishment, enabling the terminal device to quickly switch to the adjacent satellite base station (the second satellite base station), thereby solving the problem of data transmission interruption and improving communication performance. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of a communication system;

[0026] Figure 2 This is a schematic diagram of the implementation process of the wireless communication method proposed in the embodiments of this application. Figure 1 ;

[0027] Figure 3 This is a schematic diagram of an NTN network;

[0028] Figure 4 This is a schematic diagram of the first preset area;

[0029] Figure 5 This is a schematic diagram of the detection of the incident direction of the received signal;

[0030] Figure 6 Diagram illustrating the process of determining the trigger conditions for network handover. Figure 1 ;

[0031] Figure 7 This is a schematic diagram of the second preset area;

[0032] Figure 8 Diagram illustrating the process of determining the trigger conditions for network handover. Figure 2 ;

[0033] Figure 9 Diagram illustrating the process of determining the trigger conditions for network handover. Figure 3 ;

[0034] Figure 10 A schematic diagram of the RRCReestablishment signaling and its parameters;

[0035] Figure 11 A schematic diagram of the PDCP data packet format;

[0036] Figure 12 This is a schematic diagram of the implementation process of the wireless communication method proposed in the embodiments of this application. Figure 2 ;

[0037] Figure 13 This is a schematic diagram of the implementation process of the wireless communication method proposed in the embodiments of this application. Figure 3 ;

[0038] Figure 14 A schematic diagram of the wireless communication method proposed in the embodiments of this application. Figure 1 ;

[0039] Figure 15 A schematic diagram of the wireless communication method proposed in the embodiments of this application. Figure 2 ;

[0040] Figure 16 This is a schematic diagram illustrating the implementation of a wireless communication method.

[0041] Figure 17 Schematic diagram of the composition of the first satellite base station Figure 1 ;

[0042] Figure 18 Schematic diagram of the composition of the first satellite base station Figure 2 ;

[0043] Figure 19 Schematic diagram of the composition structure of the terminal device Figure 1 ;

[0044] Figure 20 Schematic diagram of the composition structure of the terminal device Figure 2 . Detailed Implementation

[0045] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for explaining the relevant application and not for limiting the application. Furthermore, it should be noted that, for ease of description, only the parts related to the relevant application are shown in the accompanying drawings.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing embodiments of this application only and is not intended to limit this application.

[0047] In the following description, references to "some embodiments" refer to a subset of all possible embodiments. It is understood that "some embodiments" may be the same or different subsets of all possible embodiments and may be combined with each other without conflict. It should also be noted that the terms "first, second, third" used in the embodiments of this application are merely for distinguishing similar objects and do not represent a specific ordering of objects. It is understood that "first, second, third" may be interchanged in a specific order or sequence where permitted, so that the embodiments of this application described herein can be implemented in an order other than that illustrated or described herein.

[0048] For the Radio Resource Control (RRC) re-establishment process of New Radio (NR), after the terminal connects to the Non-Terrestrial Network (NTN), it enters the Radio Resource Control (RRC) connected state. Simultaneously, the terminal continuously monitors its radio link with the satellite base station. When the signal quality of the radio link deteriorates, the terminal can initiate an RRC re-establishment process, temporarily suspending signaling transmissions on Signaling Radio Bearer 1 (SRB1) and SRB2, as well as data transmissions on the Data Radio Bearer (DRB), to re-search for nearby cells with better signal quality. The terminal then sends an RRC message (RRCReestablishmentRequest) to the satellite base station on the new cell. Upon receiving the RRCReestablishmentRequest message from the terminal, the satellite base station corresponding to the new cell sends an RRCReestablishment message to the terminal. This message contains only the parameters needed by the terminal to update its current security key. Upon receiving this message, the terminal updates its security key, resumes SRB1 transmission, and sends an RRC signaling message RRCReestablishmetComplete to the satellite base station. The satellite base station then further restores the terminal's SRB2 and DRB transmissions through an RRC reconfiguration process.

[0049] The RRC re-establishment process enables a terminal to attempt to re-establish an RRC connection on a neighboring cell with better signal quality when the signal quality of the radio link established with the current serving cell deteriorates due to its own movement or other reasons while it is in an RRC connected state. It is a recovery mechanism that is actively implemented by the terminal and coordinated by the satellite base station.

[0050] For the NR RRC handover process, after the terminal enters the RRC connected state, the satellite base station configures the terminal to measure the signal quality of the current serving cell and surrounding neighboring cells via the RRC signaling RRCReconfiguration. When the measurement results meet the measurement threshold, the terminal sends the measurement results to the satellite base station via the RRC signaling MeasurementReport. The base station checks the signal quality of the serving cell corresponding to the terminal in real time by parsing the measurement results reported by the terminal. When the signal quality of the serving cell deteriorates, and the signal quality of neighboring cells is good enough, the satellite base station configures the handover parameters in the RRC signaling RRCReconfiguration and sends them to the terminal. After receiving the signaling, the terminal executes the RRC handover process, switching from the current serving cell to the new target cell while maintaining the RRC connection.

[0051] The RRC handover process enables a terminal, while in an RRC connected state, to switch to a cell with better signal quality under the control of the satellite base station if the signal quality of the radio link established with the current serving cell deteriorates due to its own movement or other reasons. This avoids radio link failure and interruption of data transmission. This process differs from RRC re-establishment and is entirely controlled by the satellite base station.

[0052] In terrestrial networks, base stations are fixed in location, while terminals exhibit unpredictable mobility. In contrast, satellite base stations in NTN networks are located between 300km and 35,000km from ground terminals, making the terminal's ground movement negligible compared to the distance between the satellite base station and the terminal. Furthermore, low-Earth orbit (LEO) and medium-high orbit (MEO) satellite base stations in NTN networks move relative to the ground at speeds far exceeding those of ground terminals. Therefore, in NTN networks, asynchronous satellite base stations possess a degree of mobility, while terminals remain virtually stationary. Consequently, in NTN networks, ground terminals may require RRC handover processes due to the movement of satellite base stations, switching from one satellite base station to another.

[0053] In NTN networks, terrestrial terminals also trigger RRC re-establishment when radio link quality deteriorates. However, considering the potential mobility of satellite base stations, the satellite base station accessed after the terminal triggers RRC re-establishment may become unavailable due to its relocation. Even if RRC re-establishment is successfully completed, the terminal still needs to wait for the satellite base station to send the measurement configuration to trigger RRC handover. This may prevent the terrestrial terminal from reporting measurement events to the satellite base station in a timely manner, thus preventing it from switching to the next satellite base station and causing data transmission interruption.

[0054] In other words, common wireless communication methods do not fully consider the mobility of satellite base stations in NTN networks. This results in ground terminals being unable to report measurement events to satellite base stations in a timely manner in some scenarios, thus preventing wireless communication, causing data transmission interruptions, and reducing communication performance.

[0055] To address the problems inherent in common wireless communication schemes, in the embodiments of this application, after receiving a re-establishment request from a terminal device, the first satellite base station sends a handover request to the second satellite base station if the terminal device meets the network handover triggering conditions; after receiving reconfiguration information from the second satellite base station, it generates a first re-establishment signaling, wherein the first re-establishment signaling includes the reconfiguration information; and sends the first re-establishment signaling to the terminal device to enable the terminal device to handover to the second satellite base station. After sending a re-establishment request to the first satellite base station, the terminal device receives the first re-establishment signaling from the first satellite base station; wherein the first re-establishment signaling includes the reconfiguration information of the second satellite base station; and hands over to the second satellite base station according to the reconfiguration information. Therefore, in the embodiments of this application, the first satellite base station can first determine whether the terminal device meets the handover triggering conditions. If the handover triggering conditions are met, the first satellite base station can send a handover request to the second satellite base station and generate a corresponding first re-establishment signaling using the reconfiguration information sent by the second satellite base station. After receiving the first re-establishment signaling sent by the first satellite base station, the terminal device can directly perform handover processing based on the reconfiguration information carried in the first re-establishment signaling to switch to the second satellite base station. In other words, in this application, by fully considering the mobility of satellite base stations in the NTN network, after an RRC re-establishment occurs and it is determined that the terminal device needs to perform network handover processing, the two RRC message flows of re-establishment signaling and reconfiguration information are merged into a single RRC signaling flow. This reduces the signaling interaction time after the terminal device undergoes RRC re-establishment, enabling the terminal device to quickly switch to the adjacent satellite base station (the second satellite base station), thereby solving the problem of data transmission interruption and improving communication performance.

[0056] It should be noted that the wireless communication method provided in this application embodiment can be applied to various communication systems, such as: Global System of Mobile communication (GSM) system, Code Division Multiple Access (CDMA) system, Wideband Code Division Multiple Access (WCDMA) system, General Packet Radio Service (GPRS), LTE system, LTE Frequency Division Duplex (FDD) system, LTE Time Division Duplex (TDD) system, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication system, or 5G system, etc.

[0057] For example, in the embodiments of this application, Figure 1 A schematic diagram of a communication system, such as Figure 1 As shown, the communication system 100 may include a network device 110, which may be a device that communicates with the terminal device 100 (or a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area. The network device 110 may be a base station (BTS) in a GSM or CDMA system, a base station (NodeB, NB) in a WCDMA system, an evolved Node B (eNB or eNodeB) in an LTE system, or a radio controller in a Cloud Radio Access Network (CRAN). Alternatively, the network device may be a mobile switching center, relay station, access point, vehicle-mounted equipment, wearable device, hub, switch, bridge, router, network-side equipment in a 5G network, or network equipment in a future evolved Public Land Mobile Network (PLMN), etc.

[0058] It should be noted that, in the embodiments of this application, network device 110 may also be a non-terrestrial device in the NTN network that communicates with terminal device 100, such as a satellite base station.

[0059] It is understood that, in embodiments of this application, the communication system 100 also includes at least one terminal device 100 located within the coverage area of ​​the network device 110. As used herein, "terminal device" includes, but is not limited to, devices configured to receive / transmit communication signals via wired connections, such as via Public Switched Telephone Networks (PSTN), Digital Subscriber Line (DSL), digital cable, direct cable connection; and / or another data connection / network; and / or via a wireless interface, such as for cellular networks, Wireless Local Area Networks (WLAN), digital television networks such as DVB-H networks, satellite networks, AM-FM broadcast transmitters; and / or other terminal devices. Terminal devices configured to communicate via wireless interfaces may be referred to as "wireless communication terminals," "wireless terminals," or "mobile terminals." Examples of mobile terminals include, but are not limited to, satellite or cellular phones; personal communications system (PCS) terminals that can combine cellular radiotelephony with data processing, fax, and data communication capabilities; PDAs that may include radiotelephones, pagers, Internet / intranet access, web browsers, notebooks, calendars, and / or Global Positioning System (GPS) receivers; and conventional laptop and / or handheld receivers or other electronic devices that include radiotelephone transceivers. Terminal equipment can refer to access terminals, user equipment (UE), user units, user stations, mobile stations, mobile stations, remote stations, remote terminals, mobile devices, user terminals, terminals, wireless communication equipment, user agents, or user equipment. Access terminals can be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, in-vehicle devices, wearable devices, terminal devices in 5G networks, or terminal devices in future PLMNs, etc.

[0060] It should be noted that, in the embodiments of this application, the terminal device 100 may also be a ground device in the NTN network that communicates with the network device 110.

[0061] It should be noted that, in the embodiments of this application, terminal devices 100 can perform device-to-device (D2D) communication.

[0062] It should be noted that, in the embodiments of this application, the 5G system or 5G network may also be referred to as the NR system or NR network.

[0063] It is understood that, in the embodiments of this application, as Figure 1 The communication system shown exemplarily illustrates a network device and two terminal devices. The communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area. This application embodiment does not limit this.

[0064] It should be noted that, in the embodiments of this application, the communication system 100 may also include other network entities such as a network controller and a mobility management entity, and the embodiments of this application do not limit this.

[0065] It is understood that, in the embodiments of this application, a device with communication function in the network / system can be referred to as a communication device. Taking communication system 100 as an example, the communication device may include network device 110 and terminal device 100 with communication function. Network device 110 and terminal device 100 can be the specific devices described above, which will not be repeated here. The communication device may also include other devices in communication system 100, such as network controllers, mobility management entities, and other network entities. This application embodiment does not limit this.

[0066] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0067] One embodiment of this application provides a wireless communication method that can be applied to a first satellite base station in an NTN network, wherein... Figure 2 This is a schematic diagram of the implementation process of the wireless communication method proposed in the embodiments of this application. Figure 1 ,like Figure 2 As shown in the embodiments of this application, the method for the first satellite base station to perform wireless communication may include the following steps:

[0068] Step 101: After receiving the re-establishment request sent by the terminal device, if the terminal device meets the network handover triggering conditions, send a handover request to the second satellite base station.

[0069] In the embodiments of this application, after receiving a re-establishment request sent by a terminal device, the first satellite base station can first determine whether the terminal device meets the triggering conditions for network handover, and if the terminal device meets the triggering conditions for network handover, select to send a handover request to the second satellite base station.

[0070] It is understood that in the embodiments of this application, the terminal device can be a device in the NTN network, and the first satellite base station can be one of the at least one satellite base station in the NTN network.

[0071] It should be noted that, in the embodiments of this application, in the NTN network, different satellite base stations can provide communication coverage for different geographical areas, thereby enabling wireless communication with terminal devices located in the coverage area.

[0072] Exemplary, in some embodiments, Figure 3 A schematic diagram of an NTN network, as shown below. Figure 3 As shown, multiple satellite base stations can communicate with terminal devices located in their respective coverage areas. For example, if a terminal device is located in the coverage area of ​​satellite 2, a wireless link can be established between the terminal device and satellite 2 to achieve wireless communication.

[0073] Furthermore, in embodiments of this application, the re-establishment request received by the first satellite base station from the terminal device may include a re-establishment request signaling in an RRC message. For example, the re-establishment request sent by the terminal device may be an RRCReestablishmentRequest.

[0074] It is understood that, in the embodiments of this application, if the terminal device detects that the signal quality of the wireless link between itself and the currently connected satellite base station has deteriorated, it will search for nearby cells with better quality and send a re-establishment request to the corresponding satellite base station on the new cell with better quality.

[0075] Furthermore, in the embodiments of this application, after receiving the re-establishment request sent by the terminal device, the first satellite base station will not directly send a re-establishment signaling to the terminal device in response to the re-establishment request. Instead, it will first determine whether the terminal device meets the triggering conditions for network handover, and then perform corresponding processing based on the determination result.

[0076] It should be noted that, in the embodiments of this application, the network switching triggering condition can be assessed and determined based on whether the terminal device is about to leave the coverage area corresponding to the first satellite base station.

[0077] It is understood that, in the embodiments of this application, if it is determined that the terminal device is about to leave the coverage area corresponding to the first satellite base station, then it can be considered that after the terminal device completes the re-establishment process, it is very likely that the terminal device will still need to perform network handover processing, and thus it can be determined that the terminal device meets the triggering conditions for network handover; correspondingly, if it is determined that the terminal device will not leave the coverage area corresponding to the first satellite base station, then it can be considered that after the terminal device completes the re-establishment process, it does not need to perform network handover processing, and thus it can be determined that the terminal device does not meet the triggering conditions for network handover.

[0078] Furthermore, in the embodiments of this application, based on the relative position parameters between the terminal device and the terminal device, when the terminal device is in a first preset area and the terminal device is moving away from the first satellite base station, it can be determined that the terminal device meets the triggering conditions for network switching; wherein, the first preset area includes the edge area of ​​the coverage area corresponding to the first satellite base station.

[0079] It should be noted that, in the embodiments of this application, during the process of determining whether the terminal device meets the network handover triggering conditions, the first satellite base station can first determine whether the terminal device is within a first preset area based on the relative position parameters between the first satellite base station and the terminal device. If the terminal device is determined to be within the first preset area based on the relative position parameters, then the movement direction of the terminal device can be further determined. Then, based on the movement direction of the terminal device, it can be determined whether the terminal device is moving away from the first satellite base station, thereby determining whether the terminal device meets the network handover triggering conditions. If the movement direction of the terminal device is different from the preset direction, then it can be determined that the terminal device is moving away from the first satellite base station, that is, the terminal device meets the network handover triggering conditions.

[0080] It should be noted that, in the embodiments of the application, when the first satellite base station determines the relative position parameters between itself and the terminal device, the first satellite base station can determine the receiving direction corresponding to the terminal device by the signal strength of the signal received by the terminal device and the signal sent by the terminal device. The receiving direction can then be used to further determine the relative position parameters between itself and the terminal device, and the relative position parameters can then be used to determine whether the terminal device is within the first preset area corresponding to the first satellite base station.

[0081] It is understood that, in the embodiments of this application, the first preset area may include the edge area of ​​the coverage area corresponding to the first satellite base station. That is, the first preset area may characterize the beam edge corresponding to the first satellite base station.

[0082] Exemplary, in some embodiments, Figure 4 This is a schematic diagram of the first preset area, such as... Figure 4As shown, the edge area of ​​the coverage area of ​​the first satellite base station can be a first preset area.

[0083] Exemplary, in some embodiments, Figure 5 A schematic diagram of the detection of the incident direction of the received signal, as shown below. Figure 5 As shown, satellite base stations typically use multi-antenna arrays for receiving antennas. When radio waves transmitted by a ground terminal (terminal equipment) reach the antenna array of a satellite base station, different antenna elements in the array will capture different radio wave signal strengths. By analyzing these signal strengths, the receiving direction of the received radio waves can be determined, and thus it can be determined whether the ground terminal transmitting the radio waves is located at the beam edge (first preset area) of the satellite base station.

[0084] It should be noted that, in the embodiments of the application, if it is determined that the terminal device is within the first preset area corresponding to the first satellite base station, that is, if it is determined that the terminal device is located in the edge area of ​​the coverage area of ​​the first satellite base station, then it can be considered that the terminal device may leave the coverage area of ​​the first satellite base station. Therefore, the first satellite base station needs to determine the direction of movement of the terminal device, and then use the direction of movement of the terminal device to further determine whether the terminal device is moving away from the first satellite base station and thus determine whether the terminal device meets the triggering conditions for network handover.

[0085] Furthermore, in the embodiments of this application, when determining the moving direction of the terminal device, the first satellite base station can first determine the direction between the beam center corresponding to the terminal device and the first satellite base station, and then further determine the moving direction of the terminal device.

[0086] For example, in some embodiments, the first satellite base station can determine the direction of the terminal device relative to the beam center based on the receiving direction of the radio waves corresponding to the terminal device, and then determine the direction of the terminal device relative to the beam center as the moving direction of the terminal device.

[0087] It is understood that, in the embodiments of this application, the preset direction can be used to determine the movement direction of the first satellite base station. For example, the movement direction of the first satellite base station can be determined as the preset direction.

[0088] Furthermore, in the embodiments of this application, after determining the moving direction of the terminal device, the first satellite base station can compare the moving direction of the terminal device with a preset direction. If it is determined that the moving direction of the terminal device is different from the preset direction, then the first satellite base station can consider that the terminal device is moving away from the first satellite base station and thus can determine that the terminal device may be about to leave the coverage area corresponding to the first satellite base station, that is, it can be determined that the terminal device meets the triggering conditions for network switching.

[0089] It is understood that, in the embodiments of this application, when determining whether the terminal device meets the triggering conditions for network switching based on the moving direction of the terminal device and the preset direction, it can be considered that if the moving direction of the terminal device is different from the preset direction, then it can be determined that the terminal device is about to leave the coverage area corresponding to the first satellite base station. Alternatively, it can be considered that if the moving direction of the terminal device is opposite to the preset direction, then it can be determined that the terminal device is about to leave the coverage area corresponding to the first satellite base station.

[0090] Exemplary, in some embodiments, Figure 6 Diagram illustrating the process of determining the trigger conditions for network handover. Figure 1 ,like Figure 6 As shown, if the terminal device is located in the edge area (first preset area) of the coverage area corresponding to the first satellite base station, and the direction of the terminal device relative to the beam center (the direction of movement of the terminal device) is opposite to the direction of movement of the first satellite base station, then it can be determined that the terminal device is about to leave the coverage area corresponding to the first satellite base station, that is, the terminal device meets the triggering conditions for network handover.

[0091] Furthermore, in the embodiments of this application, if the first satellite base station determines that the terminal device meets the triggering conditions for network handover, then the first satellite base station can first identify the second satellite base station, and then send a handover request to the second satellite base station. The first satellite base station can send the handover request to the second satellite base station via an inter-satellite link between satellite base stations.

[0092] It is understood that, in the embodiments of this application, the second satellite base station can be another satellite base station in the NTN network that is different from the first satellite base station. The first and second satellite base stations can be adjacent satellite base stations in the NTN network.

[0093] It should be noted that, in the embodiments of this application, the first satellite base station can determine the second satellite base station in any way. Specifically, the first satellite base station can determine the second satellite base station from pre-stored neighboring base stations, or it can determine the second satellite base station based on the relative position parameters of the terminal device.

[0094] For example, in one embodiment, the first satellite base station can directly determine the second satellite base station to which the terminal device may move based on the relative position parameters of the terminal device.

[0095] For example, in one embodiment, a first satellite base station can determine a second satellite base station from a pre-stored candidate list of satellite base stations based on the relative location parameters of the terminal device. The first satellite base station may pre-store a candidate list of satellite base stations, containing at least one satellite base station within the same NTN network as the first satellite base station. Then, the first satellite base station can select a satellite base station from the pre-stored candidate list that the terminal device might move to within its coverage area, thereby determining the second satellite base station.

[0096] For example, in one embodiment, the first satellite base station can determine the second satellite base station from a pre-stored list of candidate satellite base stations. The first satellite base station can pre-store a candidate list of satellite base stations, and then detect the signal commands of the cells corresponding to the satellite base stations in the pre-stored list, selecting the cell with the best signal quality to determine the corresponding second satellite base station.

[0097] Furthermore, in the embodiments of this application, after the first satellite base station determines the second satellite base station, it can send a handover request to the second satellite base station.

[0098] It should be noted that, in the embodiments of this application, the handover request sent by the first satellite base station to the second satellite base station may include the handover request message in the RRC message. For example, the handover request may be an RRC handover request.

[0099] Furthermore, in the embodiments of this application, after the first satellite base station determines the relative position parameters between itself and the terminal device, if it determines that the terminal device is within a second preset area based on the relative position parameters, then it can directly determine that the terminal device does not meet the triggering conditions for network switching.

[0100] In other words, in the embodiments of this application, based on the relative position parameter, it can be determined that the terminal device does not meet the triggering conditions for network switching when the terminal device is in the second preset area.

[0101] It is understood that, in the embodiments of this application, the second preset area may include a non-edge area within the coverage area corresponding to the first satellite base station. The first and second preset areas do not overlap, and the second preset area may represent areas other than the beam edge corresponding to the first satellite base station.

[0102] Exemplary, in some embodiments, Figure 7 This is a schematic diagram of the second preset area, such as... Figure 7As shown, the areas outside the edge areas of the coverage area of ​​the first satellite base station can be the second preset area.

[0103] In other words, in the embodiments of this application, if it is determined that the terminal device is within the second preset area corresponding to the first satellite base station, that is, if it is determined that the terminal device is located in the non-edge area of ​​the coverage area of ​​the first satellite base station, then it can be considered that the terminal device will not leave the coverage area of ​​the first satellite base station. Therefore, the first satellite base station can directly determine that the terminal device does not meet the triggering conditions for network switching.

[0104] Furthermore, in the embodiments of this application, the relative position parameters between the terminal device and the terminal device can be determined first; then, based on the relative position parameters, when the terminal device is in a first preset area and the terminal device moves relative to the first satellite base station, it can be determined that the terminal device does not meet the triggering conditions for network switching.

[0105] It is understood that in the embodiments of this application, if it is determined that the terminal device is in the first preset area based on the relative position parameters, and it is determined that the moving direction of the terminal device is the same as the preset direction, then it can be considered that the terminal device is moving relatively closer to the first satellite base station, and thus it can be determined that the terminal device does not meet the triggering conditions for network switching.

[0106] In other words, in the embodiments of this application, after the first satellite base station determines the moving direction of the terminal device, it can compare the moving direction of the terminal device with the preset direction. If it is determined that the moving direction of the terminal device is the same as the preset direction, it can be determined that the terminal device is moving closer to the first satellite base station. Then the first satellite base station can assume that the terminal device will not leave the coverage area corresponding to the first satellite base station, that is, it can be determined that the terminal device does not meet the triggering conditions for network switching.

[0107] It is understood that, in the embodiments of this application, when determining whether the terminal device meets the triggering condition for network switching based on the moving direction of the terminal device and the preset direction, it can be considered that if the moving direction of the terminal device is the same as the preset direction, then it can be determined that the terminal device will not leave the coverage area corresponding to the first satellite base station. Alternatively, it can be considered that if the moving direction of the terminal device is not opposite to the preset direction, then it can be determined that the terminal device will not leave the coverage area corresponding to the first satellite base station.

[0108] Exemplary, in some embodiments, Figure 8 Diagram illustrating the process of determining the trigger conditions for network handover. Figure 2 ,like Figure 8As shown, if the terminal device is located in the non-edge area (second preset area) of the coverage area corresponding to the first satellite base station, it can be determined that the terminal device will not leave the coverage area corresponding to the first satellite base station, that is, the terminal device does not meet the triggering conditions for network handover.

[0109] Exemplary, in some embodiments, Figure 9 Diagram illustrating the process of determining the trigger conditions for network handover. Figure 3 ,like Figure 9 As shown, if the terminal device is located in the edge area (first preset area) of the coverage area corresponding to the first satellite base station, and the direction of the terminal device relative to the beam center (the direction of movement of the terminal device) is the same as the direction of movement of the first satellite base station, then it can be determined that the terminal device will not leave the coverage area corresponding to the first satellite base station, that is, the terminal device does not meet the triggering conditions for network handover.

[0110] Step 102: After receiving the reconfiguration information sent by the second satellite base station, generate the first establishment signaling; wherein the first establishment signaling includes the reconfiguration information.

[0111] In the embodiments of this application, after the first satellite base station sends a handover request to the second satellite base station, it can receive the reconfiguration information sent by the second satellite base station, and then generate a first re-establishment signaling including the reconfiguration information. The first satellite base station can receive the reconfiguration information sent by the second satellite base station through the inter-satellite link between satellite base stations.

[0112] For example, in some embodiments, the second satellite base station may send a reconfiguration signaling message to the first satellite base station, wherein the reconfiguration signaling message includes reconfiguration information for instructing configuration processing.

[0113] It should be noted that, in the embodiments of this application, the reconfiguration information received by the first satellite base station and sent by the second satellite base station may include the reconfiguration message in the RRC message. For example, the reconfiguration information sent by the second satellite base station may be the RRC signaling RRCReconfiguration.

[0114] It is understood that, in the embodiments of this application, the reconfiguration information sent by the second satellite base station to the first satellite base station may include a handover command. For example, the reconfiguration information may include an RRC handover command issued by the second satellite base station.

[0115] Furthermore, in the embodiments of this application, after receiving the reconfiguration information sent by the second satellite base station, the first satellite base station can generate a corresponding first re-establishment signaling based on the reconfiguration information, wherein the first re-establishment signaling may carry the reconfiguration information.

[0116] Furthermore, in embodiments of this application, the first re-establishment signaling may carry an encrypted data packet including reconfiguration information, and may also carry frequency hopping configuration parameters, wherein the frequency hopping configuration parameters are used to decrypt the encrypted data packet.

[0117] It should be noted that, in the embodiments of this application, after receiving the re-establishment request sent by the terminal device, the first satellite base station can first perform key update processing according to the frequency hopping configuration parameters, thereby determining the updated key.

[0118] For example, in some embodiments, the frequency hopping configuration parameter nextHopChainingCount is a parameter required to update the key. The first satellite base station can use the frequency hopping configuration parameter nextHopChainingCount to update the current security key, thereby obtaining the updated key.

[0119] Furthermore, in the embodiments of this application, when the first satellite base station generates the first re-establishment signaling based on the reconfiguration information, it can first construct an encrypted data packet based on the delay non-critical extended parameters, the reconfiguration information, and the updated key; and then it can generate the first re-establishment signaling based on the encrypted data packet.

[0120] It is understood that, in the embodiments of this application, the first satellite base station may add the handover command carried in the reconfiguration information to the re-establishment signaling based on the non-critical extension parameter lateNonCriticalExtension.

[0121] Figure 10 A schematic diagram of the RRCReestablishment signaling and its included parameters, as shown below. Figure 10 As shown, according to the relevant protocol, the RRCReestablishment signaling sent by the satellite base station to the terminal device includes the nextHopChainingCount parameter (frequency hopping configuration parameter) and the reserved extension bit lateNonCriticalExtension (delay non-critical extension parameter) for future protocol evolution. In the embodiments of this application, lateNonCriticalExtension can be used to add an RRC handover command (the handover command carried in the reconfiguration information) to the RRCReestablishment signaling.

[0122] It is understood that, in the embodiments of this application, the encrypted data packet constructed by the first satellite base station based on the delay non-critical extended parameters, reconfiguration information and the updated key can be a Packet Data Convergence Protocol (PDCP) data packet.

[0123] It should be noted that, in the embodiments of this application, considering the information security of the terminal device and to prevent it from receiving RRC signaling from an unauthorized base station, the RRC handover command from the second satellite base station needs to undergo integrity protection and encryption processing when transmitted to the terminal device. The integrity protection and encryption processing of the RRC signaling can be performed based on the PDCP data packet format.

[0124] For example, in the embodiments of this application, Figure 11 This is a schematic diagram of the PDCP data packet format, as shown below. Figure 11 As shown, the data packet length is N bytes. When the first satellite base station fills in this PDCP data packet, firstly, for byte 1, the high 4 bits are reserved and filled with 0; secondly, the low 4 bits of byte 1 and the 8 bits of byte 2 can form a 12-bit PDCP sequence number (SN), the value of which is related to the SN of the PDCP data packet transmitting RRC Reestablishment. It can be set to be the same as it, or it can be set to the sum of this value and a constant (such as 1). This application does not impose specific restrictions. Byte 3 onwards is the ASN.1 code stream of the RRC handover command, the content of which comes from the second satellite base station. The second satellite base station can transmit the RRC handover command to the first satellite base station through the inter-satellite link between satellite base stations, and the first satellite base station is the satellite base station currently issuing the RRC Reestablishment signaling. Bytes N-3 to N are MAC-I, which are 4 bytes of data obtained by performing integrity protection processing on the header of the current PDCP data packet (i.e., bytes 1 and 2) and the data of the PDCP packet (i.e., bytes 3 to N-4).

[0125] It is understood that, in the embodiments of this application, the encryption algorithm used in the integrity protection process can be the integrity protection algorithm used before the terminal initiates the RRC re-establishment, and the key used in the integrity protection process can be the new key obtained by using the old key used before the terminal initiates the RRC re-establishment as a basis and performing a key update process using the nextHopChainingCount carried in RRCReestablishment, i.e., the updated key.

[0126] Furthermore, in the embodiments of this application, after receiving the reconfiguration information transmitted by the second satellite base station, the first satellite base station can use the handover command in the reconfiguration information to construct encrypted data packets. Specifically, based on the delay-non-critical extension parameter, the first satellite base station can choose to use the reconfiguration information as a PDCP data segment, and use the corresponding PDCPSN and the updated key to construct the PDCP data packet.

[0127] It should be noted that, in the embodiments of this application, after the first satellite base station constructs an encrypted data packet based on the delay non-critical extended parameters, reconfiguration information, and the updated key, it can further use the encrypted data packet to generate the first establishment signaling.

[0128] It is understood that, in the embodiments of this application, the first re-establishment signaling constructed by the first satellite base station may include a re-establishment message in an RRC message. For example, the re-establishment signaling sent by the first satellite base station may be an RRC signaling message RRCReestablishment. The RRCReestablishment message carries reconfiguration information issued by the second satellite base station.

[0129] For example, in some embodiments, the first satellite base station can put the constructed PDCP data packet into RRCReestablishment, thereby completing the construction of the first re-establishment signaling. The first re-establishment signaling may carry reconfiguration information issued by the second satellite base station.

[0130] It should be noted that, in the embodiments of this application, since the PDCP data packet is located within the RRCReestablishment signaling, it is sufficient to perform integrity protection verification on the RRCReestablishment itself. However, the PDCP data packet header is essential because the MAC-I is generated based on the header and data segment, and the generated MAC-I is encrypted together with the data segment. Therefore, the PDCP data packet header setting only needs to be related to the current data transmission information of the terminal device. For example, it can reuse the 'PDCP header for transmitting RRCReestablishment' or make certain regular changes to it.

[0131] In other words, in the embodiments of this application, in order to verify the integrity of the PDCP data packet, no specific restrictions are placed on the way the header of the PDCP data packet carried in the RRCreesablishment is set.

[0132] Step 103: Send the first establishment signaling to the terminal device so that the terminal device switches to the second satellite base station.

[0133] In the embodiments of this application, after the first satellite base station receives the reconfiguration information sent by the second satellite base station and generates a first re-establishment signaling including the reconfiguration information, it can further send the first re-establishment signaling to the terminal device, thereby enabling the terminal device to switch to the second satellite base station.

[0134] It should be noted that, in the embodiments of this application, since the first re-establishment signaling sent by the first satellite base station to the terminal device carries reconfiguration information sent by the second satellite base station that includes a handover command, after receiving the first re-establishment signaling, the terminal device can directly perform network handover processing according to the reconfiguration information based on the corresponding handover command, thereby switching to the second satellite base station.

[0135] It is understood that, in the embodiments of this application, precisely because the first re-establishment signaling carries reconfiguration information including a handover command, the two RRC message flows of re-establishment and handover can be merged into a single RRC signaling flow, enabling the terminal device to directly perform network handover processing without having to re-initiate the handover processing flow to the second satellite base station, thereby reducing the signaling interaction time after the terminal undergoes RRC re-establishment.

[0136] For example, in some embodiments, the first satellite base station may send an RRCReestablishment to the terminal device, wherein the RRCReestablishment carries an encrypted data packet constructed based on reconfiguration information, so that after receiving the first re-establishment signaling RRCReestablishment, the terminal device can use the reconfiguration information carried therein to perform network handover processing and switch to the second satellite base station.

[0137] It is understood that, in the embodiments of this application, the first establishment signaling sent from the first satellite base station to the terminal device may carry frequency hopping configuration parameters. These frequency hopping configuration parameters can be used by the terminal device for key update processing.

[0138] For example, in some embodiments, the first satellite base station can send RRCReestablishment to the terminal device, wherein RRCReestablishment carries the nextHopChainingCount parameter (frequency hopping configuration parameter). The nextHopChainingCount parameter can be a parameter required to update the key. That is, after receiving the re-establishment signaling RRCReestablishment, the terminal device can use the nextHopChainingCount parameter carried therein to update the current security key.

[0139] Furthermore, Figure 12 This is a schematic diagram of the implementation process of the wireless communication method proposed in the embodiments of this application. Figure 2 ,like Figure 12 As shown in the embodiments of this application, the method for the first satellite base station to perform wireless communication may include the following steps:

[0140] Step 104: After receiving the re-establishment request from the terminal device, if the terminal device does not meet the triggering conditions for network handover, send a second re-establishment signaling to the terminal device.

[0141] In the embodiments of this application, after receiving a re-establishment request sent by a terminal device, the first satellite base station can first determine whether the terminal device meets the triggering conditions for network handover. If it is determined that the terminal device does not meet the triggering conditions for network handover, then it can directly send a second re-establishment signaling to the terminal device.

[0142] It should be noted that, in the embodiments of this application, the second re-establishment signaling sent by the first satellite base station to the terminal device may include the re-establishment message in the RRC message. For example, the second re-establishment signaling sent by the first satellite base station may be the RRC signaling RRCReestablishment.

[0143] It is understood that, in the embodiments of this application, the second establishment signaling sent from the first satellite base station to the terminal device may carry frequency hopping configuration parameters. These frequency hopping configuration parameters can be used by the terminal device for key update processing.

[0144] It is understood that, in the embodiments of this application, both the first and second establishment signaling carry frequency hopping configuration parameters. However, unlike the second establishment signaling, the first establishment signaling also carries reconfiguration information sent by the second satellite base station.

[0145] For example, in some embodiments, after determining that the terminal device does not meet the triggering conditions for network handover, the first satellite base station can send an RRCReestablishment to the terminal device. The RRCReestablishment carries the nextHopChainingCount parameter (frequency hopping configuration parameter). The nextHopChainingCount parameter can be a parameter required to update the key. That is, after receiving the re-establishment signaling RRCReestablishment, the terminal device can use the nextHopChainingCount parameter carried therein to update the current security key.

[0146] Step 105: Receive the re-establishment message sent by the terminal device.

[0147] In the embodiments of this application, after the first satellite base station sends a second re-establishment signaling to the terminal device, it can receive the re-establishment message sent by the terminal device.

[0148] It should be noted that, in the embodiments of this application, the re-establishment message received by the first satellite base station and sent by the terminal device may include the re-establishment message in the RRC message. For example, the re-establishment message sent by the terminal device may be the RRC signaling RRCReestablishmetComplete.

[0149] It is understood that, in the embodiments of this application, after the first satellite base station sends the second re-establishment signaling to the terminal device, the terminal device will perform key update processing and restore the transmission of SRB1, and then send the RRC signaling RRCReestablishmetComplete to the satellite base station. Subsequently, the first satellite base station will further restore the transmission of SRB2 and DRB of the terminal device through the RRC reconfiguration process.

[0150] It is understandable that in related technologies, when a terminal device leaves the coverage area of ​​a satellite base station, it is likely to enter, or has already entered, the coverage area of ​​another satellite base station. In this case, if the terminal initiates RRC re-establishment on the satellite base station it is about to leave coverage, it is likely to result in RRC re-establishment failure or subsequent RRC handover failure. For the special scenario in the aforementioned NTN network, the wireless communication method proposed in this application, considering the regular mobility of satellite base stations in the NTN network while the terminal device can be considered approximately stationary, enables the terminal to quickly hand over to an adjacent satellite base station, improving the success rate of RRC handover after RRC reconstruction and accelerating data transmission recovery.

[0151] In summary, through the wireless communication method proposed in steps 101 to 105 above, after receiving the re-establishment request sent by the terminal device, the first satellite base station can first determine whether the terminal device is about to leave the coverage area of ​​the first satellite base station, that is, determine whether the terminal device meets the triggering conditions for network handover. If it is determined that the terminal device may be about to leave the coverage area of ​​the first satellite base station, it can directly initiate a handover request to the second satellite base station and generate a first re-establishment signaling based on the reconfiguration information sent by the second satellite base station. This enables the terminal device to perform corresponding handover processing after receiving the first re-establishment signaling in order to hand over to the second satellite base station.

[0152] In other words, the wireless communication method proposed in this application can avoid the situation in an NTN network where, after a ground terminal (terminal device) initiates RRC re-establishment, the satellite base station may soon lose coverage due to its own movement, thus preventing the timely control of the terminal to switch to a more suitable adjacent satellite base station. Because the mobility of satellite base stations is fully considered, the terminal device can directly perform handover processing after RRC re-establishment via the first re-establishment signaling carrying reconfiguration information issued by the first satellite base station, quickly switching to an adjacent satellite base station (second satellite base station). This improves the success rate of RRC handover after RRC reconstruction and solves the problem of data transmission interruption.

[0153] Understandably, in related schemes, the RRC re-establishment process is used to restore data transmission on SRB1. After RRC re-establishment, RRCReconfiguration is needed to further restore data transmission on SRB2 and DRB. However, the wireless communication method proposed in this application can merge the two RRC message flows of re-establishment signaling and reconfiguration information into a single RRC signaling flow, thereby reducing the signaling interaction time after RRC re-establishment by the terminal device.

[0154] Furthermore, the wireless communication method proposed in this application fully considers the security issues between terminal devices and satellite base stations in NTN networks. Since the RRC re-establishment process involves updating the security key, in this application, the newly introduced RRC handover command in the RRCReestablishment signaling takes the form of a PDCP data packet. This PDCP data packet undergoes integrity protection and encryption processing using the updated key.

[0155] It is understood that the wireless communication method proposed in the embodiments of this application can be applied to various communication systems, such as 4G (LTE) systems or 5G systems, taking 5G systems as an example.

[0156] This application provides a wireless communication method applied to a first satellite base station. After receiving a re-establishment request from a terminal device, the first satellite base station, if the terminal device meets the network handover triggering conditions, sends a handover request to a second satellite base station. After receiving reconfiguration information from the second satellite base station, it generates a first re-establishment signaling message, which includes reconfiguration information. The first re-establishment signaling message is then sent to the terminal device to enable the terminal device to handover to the second satellite base station. Therefore, in this embodiment, the first satellite base station can first determine whether the terminal device meets the handover triggering conditions. If the conditions are met, the first satellite base station can send a handover request to the second satellite base station and generate a corresponding first re-establishment signaling message using the reconfiguration information sent by the second satellite base station. Upon receiving the first re-establishment signaling message from the first satellite base station, the terminal device can directly perform handover processing based on the reconfiguration information carried in the first re-establishment signaling message to handover to the second satellite base station. In other words, in this application, by fully considering the mobility of satellite base stations in the NTN network, after an RRC re-establishment occurs and it is determined that the terminal device needs to perform network handover processing, the two RRC message flows of re-establishment signaling and reconfiguration information are merged into a single RRC signaling flow. This reduces the signaling interaction time after the terminal device undergoes RRC re-establishment, enabling the terminal device to quickly switch to an adjacent satellite base station (the second satellite base station), thereby solving the problem of data transmission interruption and improving communication performance.

[0157] Based on the above embodiments, in another embodiment of this application, the wireless communication method can be applied to terminal devices in an NTN network, wherein... Figure 13 This is a schematic diagram of the implementation process of the wireless communication method proposed in the embodiments of this application. Figure 3 ,like Figure 13 As shown in the embodiments of this application, the method for a terminal device to perform wireless communication may include the following steps:

[0158] Step 201: After sending a re-establishment request to the first satellite base station, receive the first re-establishment signaling sent by the first satellite base station; wherein the first re-establishment signaling includes the reconfiguration information of the second satellite base station.

[0159] In the embodiments of this application, after sending a re-establishment request to the first satellite base station, the terminal device can receive a first re-establishment signaling sent by the first satellite base station. This first re-establishment information may carry reconfiguration information for the second satellite base station.

[0160] It should be noted that, in the embodiments of this application, the terminal device can be any form such as a device, chip, integrated circuit (IC), application specific integrated circuit (ASIC).

[0161] It is understood that in the embodiments of this application, the terminal device can be a device in the NTN network, and the first satellite base station can be one of the at least one satellite base station in the NTN network.

[0162] It should be noted that, in the embodiments of this application, in the NTN network, different satellite base stations can provide communication coverage for different geographical areas, thereby enabling wireless communication with terminal devices located in the coverage area.

[0163] Furthermore, in embodiments of this application, the re-establishment request sent by the terminal device to the first satellite base station may include a re-establishment request signaling in an RRC message. For example, the re-establishment request sent by the terminal device may be an RRCReestablishmentRequest.

[0164] It is understood that, in the embodiments of this application, if the terminal device detects that the signal quality of the wireless link between itself and the currently connected satellite base station has deteriorated, it will search for nearby cells with better quality and send a re-establishment request to the corresponding satellite base station on the new cell with better quality.

[0165] It is understood that, in the embodiments of this application, the first re-establishment signaling sent by the first satellite base station to the terminal device may include the re-establishment message in the RRC message. For example, the first re-establishment signaling sent by the first satellite base station may be the RRC signaling RRCReestablishment.

[0166] It should be noted that, in the embodiments of this application, the reconfiguration information can be sent from the second satellite base station to the first satellite base station. The reconfiguration information may include a handover command; for example, the reconfiguration information may contain an RRC handover command issued by the second satellite base station.

[0167] For example, in some embodiments, the second satellite base station may send a reconfiguration signaling message to the first satellite base station, wherein the reconfiguration signaling message includes reconfiguration information for instructing configuration processing.

[0168] Step 202: Switch to the second satellite base station according to the reconfiguration information.

[0169] In the embodiments of this application, after the terminal device sends a re-establishment request to the first satellite base station and receives the first re-establishment signaling sent by the first satellite base station, it can switch to the second satellite base station according to the reconfiguration information corresponding to the second satellite base station included in the first re-establishment signaling.

[0170] It should be noted that, in the embodiments of this application, the reconfiguration information received by the first satellite base station and sent by the second satellite base station may include the reconfiguration message in the RRC message. For example, the reconfiguration information sent by the second satellite base station may be the RRC signaling RRCReconfiguration.

[0171] It is understood that, in the embodiments of this application, the first satellite base station may add the handover command carried in the reconfiguration information to the first re-establishment signaling based on the non-critical extension parameter lateNonCriticalExtension.

[0172] Furthermore, in the embodiments of this application, the first re-establishment signaling may carry an encrypted data packet including reconfiguration information and frequency hopping configuration parameters. After receiving the first re-establishment signaling sent by the first satellite base station, the terminal device can decrypt the encrypted data packet according to the frequency hopping configuration parameters, thereby obtaining the reconfiguration information of the second satellite base station.

[0173] It should be noted that, in the embodiments of this application, when decrypting the encrypted data packet according to the frequency hopping configuration parameters, the key can be updated first according to the frequency hopping configuration parameters to determine the updated key; then the encrypted data packet can be decrypted according to the updated key.

[0174] It is understood that in the embodiments of this application, the first establishment signaling carries frequency hopping configuration parameters. Therefore, after receiving the first establishment signaling sent by the first satellite base station, the terminal device can perform key update processing according to the frequency hopping configuration parameters to determine the updated key.

[0175] For example, in some embodiments, the frequency hopping configuration parameter nextHopChainingCount is a parameter required to update the key. The first satellite base station can use the frequency hopping configuration parameter nextHopChainingCount to update the current security key, thereby obtaining the updated key. Correspondingly, the terminal device can also use the frequency hopping configuration parameter nextHopChainingCount to update the current security key, thereby obtaining the updated key.

[0176] It is understood that, in the embodiments of this application, the data packets included in the first establishment signaling can be PDCP data packets. Considering the information security of the terminal device and to prevent it from receiving RRC signaling from an unauthorized base station, the RRC handover command from the second satellite base station needs to undergo integrity protection and encryption processing when transmitted to the terminal device. The integrity protection and encryption processing of the RRC signaling can be performed based on the format of the PDCP data packets.

[0177] For example, in the embodiments of this application, such as Figure 11 As shown, the data packet length is N bytes. When the first satellite base station fills in this PDCP data packet, firstly, for byte 1, the high 4 bits are reserved and filled with 0; secondly, the low 4 bits of byte 1 and the 8 bits of byte 2 can form a 12-bit PDCP sequence number (SN), the value of which is related to the SN of the PDCP data packet transmitting RRC Reestablishment. It can be set to be the same as it, or it can be set to the sum of this value and a constant (such as 1). This application does not impose specific restrictions. Byte 3 onwards is the ASN.1 code stream of the RRC handover command, the content of which comes from the second satellite base station. The second satellite base station can transmit the RRC handover command to the first satellite base station through the inter-satellite link between satellite base stations, and the first satellite base station is the satellite base station currently issuing the RRC Reestablishment signaling. Bytes N-3 to N are MAC-I, which are 4 bytes of data obtained by performing integrity protection processing on the header of the current PDCP data packet (i.e., bytes 1 and 2) and the data of the PDCP packet (i.e., bytes 3 to N-4).

[0178] Furthermore, in the embodiments of this application, if the first re-establishment signaling sent by the first satellite base station carries reconfiguration information issued by the second satellite base station, then when the terminal device switches to the second satellite base station corresponding to the reconfiguration information, it can choose to initiate random access to the second satellite base station according to the reconfiguration information, and then send a reconfiguration completion message to the second satellite base station.

[0179] It should be noted that, in the embodiments of this application, the reconfiguration completion message sent by the terminal device to the second satellite base station may include the reconfiguration completion message in the RRC message. For example, the reconfiguration completion message sent by the terminal device may be the RRC signaling RRCReconfigurationComplete.

[0180] Furthermore, in the embodiments of this application, after the terminal device sends a re-establishment request to the first satellite base station, it can also receive a second re-establishment signaling sent by the first satellite base station; then it can perform re-establishment processing according to the second re-establishment signaling and send a re-establishment message to the first satellite base station.

[0181] It should be noted that, in the embodiments of this application, after receiving the second re-establishment signaling sent by the first satellite base station, the terminal device can first determine whether the second re-establishment signaling includes encrypted data packets. If it does not include encrypted data packets, it can be assumed that the second re-establishment signaling does not carry reconfiguration information, that is, no handover processing is required. Therefore, re-establishment processing can be performed directly, and a re-establishment message can be sent to the first satellite base station.

[0182] It should be noted that, in the embodiments of this application, the re-establishment message sent by the terminal device to the first satellite base station may include the re-establishment message in the RRC message. For example, the re-establishment message sent by the terminal device may be the RRC signaling RRCReestablishmetComplete.

[0183] Furthermore, in the embodiments of this application, the second establishment signaling carries frequency hopping configuration parameters. Therefore, after receiving the second establishment signaling sent by the first satellite base station, the terminal device can also perform key update processing according to the frequency hopping configuration parameters to determine the updated key.

[0184] It is understood that, in the embodiments of this application, both the first and second establishment signaling carry frequency hopping configuration parameters. However, unlike the second establishment signaling, the first establishment signaling also carries reconfiguration information sent by the second satellite base station.

[0185] For example, in some embodiments, the frequency hopping configuration parameter nextHopChainingCount is a parameter required to update the key. The first satellite base station can use the frequency hopping configuration parameter nextHopChainingCount to update the current security key, thereby obtaining the updated key. Correspondingly, the terminal device can also use the frequency hopping configuration parameter nextHopChainingCount to update the current security key, thereby obtaining the updated key.

[0186] Furthermore, in the embodiments of this application, after receiving the RRC handover message sent by the first satellite base station, the terminal device may choose to immediately execute the RRC handover process in response to the RRC handover command carried in the RRC handover message, or it may choose to execute the RRC handover process under certain conditions.

[0187] It is understood that, in the embodiments of this application, reconfiguration information can be used to indicate handover conditions. After receiving the RRCreesablishment sent by the first satellite base station, the terminal device can choose to respond to the handover conditions indicated by the reconfiguration information carried in the RRCreesablishment. When the handover conditions indicated by the reconfiguration information are met, the terminal device initiates random access to the second satellite base station according to the reconfiguration information and sends a reconfiguration completion message to the second satellite base station.

[0188] For example, in some embodiments, the handover command included in the reconfiguration information carried in the re-establishment signaling RRCresablishment can also be configured as a conditional handover (CHO). The reconfiguration information can be used to indicate handover conditions, that is, the handover command included in the reconfiguration information can be a conditional handover command. When certain conditions are met, that is, when the handover conditions indicated by the reconfiguration information are met, such as when the signal of the adjacent satellite base station (the second satellite base station) is good enough and the signal of the current satellite base station is poor enough, the terminal device will execute the handover command and initiate random access to the second satellite base station. This configuration method is more flexible and can adapt to scenarios with more complex signal changes.

[0189] It should be noted that, in the embodiments of this application, after the terminal device sends a re-establishment request to the first satellite base station, the re-establishment signaling received from the first satellite base station may or may not carry reconfiguration information. If the re-establishment signaling (such as the first re-establishment signaling) carries reconfiguration information, the terminal device can directly perform handover processing based on that reconfiguration information; if the re-establishment signaling (such as the second re-establishment signaling) does not carry reconfiguration information, the terminal device can complete the re-establishment process.

[0190] For example, in some embodiments, after receiving a re-establishment signaling (such as a first re-establishment signaling or a second re-establishment signaling) sent by the first satellite base station, the terminal device performs a key update process, and then determines whether there is a PDCP data packet in the extended field of the re-establishment signaling. If there is a PDCP data packet in the extended field of the re-establishment signaling, the terminal device can choose to parse the PDCP data packet, determine the reconfiguration information carried therein, and perform an RRC handover process according to the reconfiguration information, initiate random access to the corresponding second satellite base station, and send a reconfiguration completion message to the second satellite base station. If there is no PDCP data packet in the extended field of the re-establishment signaling, the terminal device can first restore the transmission of SRB1, and then send a re-establishment message to the satellite base station. Subsequently, the first satellite base station will further restore the transmission of SRB2 and DRB of the terminal device through the RRC reconfiguration process.

[0191] It is understandable that in related technologies, when a terminal device leaves the coverage area of ​​a satellite base station, it is likely to enter, or has already entered, the coverage area of ​​another satellite base station. In this case, if the terminal initiates RRC re-establishment on the satellite base station it is about to leave coverage, it is likely to result in RRC re-establishment failure or subsequent RRC handover failure. For the special scenario in the aforementioned NTN network, the wireless communication method proposed in this application, considering the regular mobility of satellite base stations in the NTN network while the terminal device can be considered approximately stationary, enables the terminal to quickly hand over to an adjacent satellite base station, improving the success rate of RRC handover after RRC reconstruction and accelerating data transmission recovery.

[0192] In summary, through the wireless communication method proposed in steps 201 to 202 above, after the terminal device sends a re-establishment request to the first satellite base station and receives the first re-establishment signaling sent by the first satellite base station, if the first re-establishment signaling carries reconfiguration information issued by the second satellite base station, the terminal device can perform corresponding handover processing according to the reconfiguration information to switch to the second satellite base station.

[0193] In other words, the wireless communication method proposed in this application can avoid the situation in an NTN network where, after a ground terminal (terminal device) initiates RRC re-establishment, the satellite base station may soon lose coverage due to its own movement, thus preventing the timely control of the terminal to switch to a more suitable adjacent satellite base station. Because the mobility of satellite base stations is fully considered, the terminal device can directly perform handover processing after RRC re-establishment via the first re-establishment signaling carrying reconfiguration information issued by the first satellite base station, quickly switching to an adjacent satellite base station (second satellite base station). This improves the success rate of RRC handover after RRC reconstruction and solves the problem of data transmission interruption.

[0194] Understandably, in related schemes, the RRC re-establishment process is used to restore data transmission on SRB1. After RRC re-establishment, RRCReconfiguration is needed to further restore data transmission on SRB2 and DRB. However, the wireless communication method proposed in this application can merge the two RRC message flows of re-establishment signaling and reconfiguration information into a single RRC signaling flow, thereby reducing the signaling interaction time after RRC re-establishment by the terminal device.

[0195] Furthermore, the wireless communication method proposed in this application fully considers the security issues between terminal devices and satellite base stations in NTN networks. Since the RRC re-establishment process involves updating the security key, in this application, the newly introduced RRC handover command in the RRCReestablishment signaling takes the form of a PDCP data packet. This PDCP data packet undergoes integrity protection and encryption processing using the updated key.

[0196] It is understood that the wireless communication method proposed in the embodiments of this application can be applied to various communication systems, such as 4G (LTE) systems or 5G systems, taking 5G systems as an example.

[0197] This application provides a wireless communication method in which a terminal device, after sending a re-establishment request to a first satellite base station, receives a first re-establishment signaling from the first satellite base station. The first re-establishment signaling includes reconfiguration information from a second satellite base station. The terminal device then switches to the second satellite base station based on the reconfiguration information. Therefore, in this embodiment, the first satellite base station can first determine whether the terminal device meets the handover triggering conditions. If the handover triggering conditions are met, the first satellite base station can send a handover request to the second satellite base station and generate a corresponding first re-establishment signaling using the reconfiguration information sent by the second satellite base station. After receiving the first re-establishment signaling from the first satellite base station, the terminal device can directly perform handover processing based on the reconfiguration information carried in the first re-establishment signaling to switch to the second satellite base station. In other words, in this application, by fully considering the mobility of satellite base stations in the NTN network, after an RRC re-establishment occurs and it is determined that the terminal device needs to perform network handover processing, the two RRC message flows of re-establishment signaling and reconfiguration information are merged into a single RRC signaling flow. This reduces the signaling interaction time after the terminal device undergoes RRC re-establishment, enabling the terminal device to quickly switch to an adjacent satellite base station (the second satellite base station), thereby solving the problem of data transmission interruption and improving communication performance.

[0198] Based on the above embodiments, this application proposes a wireless communication method, which is a control method for RRC re-establishment in an NTN. This wireless communication method can be applied to satellite base stations (such as a first satellite base station and a second satellite base station) and terminal devices in an NTN network.

[0199] It should be noted that, in the wireless communication method proposed in this application, when the satellite base station (first satellite base station) receives the RRC Reestablishment Request signaling sent by the ground terminal (terminal equipment), it first determines whether the terminal equipment is about to leave the coverage area of ​​the satellite base station, that is, whether the terminal equipment meets the network handover triggering conditions. If the conditions (network handover triggering conditions) are met, the RRC Reestablishment signaling (first reestablishment signaling) carries the RRC handover command (the handover command included in the reconfiguration information) and sends it to the ground terminal. The ground terminal can then immediately execute the RRC handover process upon receiving the RRC Reestablishment signaling and switch to the next satellite base station (second satellite base station).

[0200] Accordingly, if the conditions (triggering conditions for network handover) are not met, the wireless communication method proposed in this application does not need to carry the RRC handover command in the RRC Reestablishment signaling (second establishment signaling), and the ground terminal can continue to execute the RRC reconstruction process after receiving the RRC Reestablishment signaling.

[0201] It should be noted that in some embodiments, the receiving antenna of the satellite base station generally adopts a multi-antenna array, such as... Figure 5 As shown, when the radio waves sent by the ground terminal reach the antenna array of the satellite base station, different antenna elements in the antenna array will capture different radio wave signal strengths. By analyzing these signal strengths, the receiving direction of the received radio waves can be determined, that is, whether the ground terminal that sent the radio waves is at the beam edge of the satellite base station.

[0202] Understandably, in some embodiments, when the satellite base station determines whether the terminal is at the edge of the beam, it further determines whether its own trajectory is opposite to the direction of the terminal relative to the beam center. If it is opposite, it means that the terminal is about to leave the satellite's coverage area. Figure 6 As shown.

[0203] Furthermore, in some embodiments, the RRCReestablishment signaling sent by the satellite base station to the ground terminal in the relevant protocol includes the nextHopChainingCount parameter and a reserved extension bit lateNonCriticalExtension for future protocol evolution. The lateNonCriticalExtension can be used to add the required RRC handover commands.

[0204] Understandably, in some embodiments, to ensure the information security of the ground terminal and prevent it from receiving RRC signaling from unauthorized base stations, the RRC handover command needs to undergo integrity protection and encryption when transmitted to the terminal. Furthermore, the integrity protection and encryption of the RRC signaling requires adherence to the PDCP data packet format, as shown in the format... Figure 11 As shown, the data packet length is N bytes.

[0205] Furthermore, in some embodiments, the satellite base station fills in the PDCP data packet as follows:

[0206] 1. The high 4 bits in byte 1 are reserved and should be filled with 0.

[0207] 2. The lower 4 bits of byte 1 and the 8 bits of byte 2 form a 12-bit PDCP SN. Its value is related to the SN of the PDCP data packet transmitting RRC Reestablishment. It can be set to be the same as it, or to the value +1. There are many options for how to set it, and this application does not limit it.

[0208] 3. Starting from byte 3, the ASN.1 code stream of the RRC handover command is generated. Its content comes from the adjacent satellite base station and is transmitted to the satellite base station that is currently issuing the RRC Reestablishment signaling through the inter-satellite link between the satellite base stations.

[0209] 4. Bytes N-3 to N are MAC-I, which are 4 bytes of data obtained by performing integrity protection processing on the header of the current PDCP data packet (i.e., bytes 1 and 2) and the data of the PDCP packet (i.e., bytes 3 to N-4).

[0210] It is understood that, in some embodiments, the encryption algorithm and key used for integrity protection are as follows:

[0211] 1. The integrity protection algorithm used by the terminal device before initiating RRC re-establishment;

[0212] 2. The terminal device uses the old key before initiating the RRC re-establishment as a basis, and uses the nextHopChainingCount carried in RRCReestablishment to perform a key update process to obtain a new key.

[0213] Exemplary, in some embodiments, Figure 14 A schematic diagram of the wireless communication method proposed in the embodiments of this application. Figure 1 ,like Figure 14 As shown, the following steps can be performed to implement the wireless communication method for the first satellite base station, the second satellite base station, and the terminal equipment in the NTN network:

[0214] Step 301: The terminal device sends a Reestablishment Request (RRCReestablishmentRequest).

[0215] In embodiments of this application, if the terminal device detects a deterioration in the signal quality of its wireless link with the currently connected satellite base station, it will re-search for nearby cells with better signal quality and send a re-establishment request to the corresponding satellite base station on the new cell with better signal quality. For example, the terminal device may send a re-establishment request (RRCReestablishmentRequest) to the first satellite base station.

[0216] Step 302: The first satellite base station uses the frequency hopping configuration parameter (nextHopChainingCount) to perform key update processing.

[0217] In the embodiments of this application, after receiving the re-establishment request sent by the terminal device, the first satellite base station can first use the frequency hopping configuration parameter nextHopChainingCount to perform base station-side key update processing on the current security key, thereby obtaining the updated key.

[0218] Step 303: If it is determined that the terminal device is about to leave the coverage area, the first satellite base station sends a handover request to the second satellite base station.

[0219] In the embodiments of this application, after receiving the re-establishment request sent by the terminal device, the first satellite base station also needs to determine whether the terminal device is about to leave the coverage area of ​​the first satellite base station, that is, to determine whether the terminal device meets the triggering conditions for network handover, and then perform corresponding processing based on the determination result.

[0220] In other words, in this application, the triggering condition for network handover can be assessed and determined based on whether the terminal device is about to leave the coverage area corresponding to the first satellite base station.

[0221] It should be noted that, in the embodiments of this application, during the process of determining whether the terminal device meets the triggering conditions for network handover, the first satellite base station can first determine the relative position parameters between itself and the terminal device; then, it can use the relative position parameters to determine whether the terminal device is within a first preset area. If the terminal device is determined to be within the first preset area based on the relative position parameters, the movement direction of the terminal device can be further determined; then, the movement direction of the terminal device is used to determine whether the terminal device meets the triggering conditions for network handover. If the movement direction of the terminal device is different from the preset direction, it can be determined that the terminal device meets the triggering conditions for network handover.

[0222] Furthermore, in the embodiments of this application, after the first satellite base station determines the relative position parameters between itself and the terminal device, if it determines that the terminal device is within a second preset area based on the relative position parameters, then it can directly determine that the terminal device does not meet the triggering conditions for network switching.

[0223] Furthermore, in the embodiments of this application, if it is determined that the terminal device is in a first preset area based on the relative position parameters, and it is determined that the moving direction of the terminal device is the same as the preset direction, then it can be determined that the terminal device does not meet the triggering conditions for network switching.

[0224] Furthermore, in the embodiments of this application, if it is determined that the terminal device meets the network handover triggering conditions, then the first satellite base station may choose to send an RRC handover request to the second satellite base station. The second satellite base station can be another satellite base station in the NTN network that is different from the first satellite base station. The first and second satellite base stations can be adjacent satellite base stations in the NTN network.

[0225] It should be noted that, in the embodiments of this application, the first satellite base station can determine the second satellite base station in any way. Specifically, the first satellite base station can determine the second satellite base station from pre-stored adjacent base stations, or it can determine the second satellite base station based on the movement direction of the terminal device.

[0226] Step 304: The second satellite base station allocates wireless resources to the terminal equipment.

[0227] In the embodiments of this application, after receiving the handover request sent by the first satellite base station, the second satellite base station can allocate radio resources for RRC handover processing to the terminal device.

[0228] Step 305: The second satellite base station sends reconfiguration information RRCReconfiguration to the first satellite base station.

[0229] In the embodiments of this application, after the second satellite base station completes the allocation of radio resources for RRC handover processing, it can send reconfiguration information RRCReconfiguration to the first satellite base station, wherein the reconfiguration information RRCReconfiguration includes a handover command.

[0230] Step 306: The first satellite base station generates PDCP data packets based on the reconfiguration information and uses the PDCP data packets to construct the first re-establishment signaling.

[0231] In the embodiments of this application, after receiving reconfiguration information including a handover command sent by the second satellite base station, the first satellite base station can first construct an encrypted data packet based on the delay non-critical extended parameters, the reconfiguration information, and the updated key; then it can generate a first establishment signaling based on the encrypted data packet.

[0232] It is understood that, in the embodiments of this application, the first satellite base station can add the handover command carried in the reconfiguration information to the first re-establishment signaling based on the non-critical extension parameter lateNonCriticalExtension. Specifically, based on the late non-critical extension parameter, the first satellite base station can choose to use the reconfiguration information as a PDCP data segment, use the corresponding PDCP SN and the updated key to construct a PDCP data packet, and then place the constructed PDCP data packet into RRCReestablishment, thereby completing the construction of the first re-establishment signaling.

[0233] It should be noted that, in the embodiments of this application, since the PDCP data packet is located within the RRCReestablishment signaling, it is sufficient to perform integrity protection verification on the RRCReestablishment itself. However, the PDCP data packet header is essential because the MAC-I is generated based on the header and data segment, and the generated MAC-I is encrypted together with the data segment. Therefore, the PDCP data packet header setting only needs to be related to the current data transmission information of the terminal device. For example, it can reuse the 'PDCP header for transmitting RRCReestablishment' or make certain regular changes to it.

[0234] In other words, in the embodiments of this application, in order to verify the integrity of the PDCP data packet, no specific restrictions are placed on the way the header of the PDCP data packet carried in the RRCreesablishment is set.

[0235] Step 307: The first satellite base station sends the first re-establishment signal (RRCReestablishment) to the terminal equipment.

[0236] In the embodiments of this application, after the first satellite base station generates the first re-establishment signaling RRCReestablishment based on the reconfiguration information, it can further send the first re-establishment signaling to the terminal device.

[0237] Step 308: The terminal device uses the frequency hopping configuration parameter nextHopChainingCount to perform key update processing.

[0238] In the embodiments of this application, the terminal device can first use the frequency hopping configuration parameter nextHopChainingCount carried in the re-establishment signaling RRCReestablishment to perform terminal-side key update processing, thereby obtaining the updated key.

[0239] Step 309: The terminal device decrypts the encrypted data packets included in the first re-establishment signaling RRCReestablishment according to the updated key, and determines the reconfiguration information.

[0240] In the embodiments of this application, after receiving the first re-establishment signaling sent by the first satellite base station, the terminal device can first determine whether the first re-establishment signaling includes encrypted data packets. If it includes encrypted data packets, it can be considered that the first re-establishment signaling carries reconfiguration information. Therefore, the encrypted data packets can be further parsed according to the updated key to determine the reconfiguration information RRCReconfiguration.

[0241] Step 310: The terminal device initiates random access to the second satellite base station indicated by the reconfiguration information RRCReconfiguration.

[0242] In the embodiments of this application, after parsing the PDCP data packet and determining the reconfiguration information carried therein, the terminal device can perform the RRC handover process according to the reconfiguration information and initiate random access to the second satellite base station indicated by the reconfiguration information.

[0243] Step 311: The terminal device sends a reconfiguration complete message to the second satellite base station.

[0244] In embodiments of this application, the terminal device may also send a reconfiguration complete message RRCReconfigurationComplete to the second satellite base station.

[0245] Furthermore, in the embodiments of this application, after receiving the RRC handover message sent by the first satellite base station, the terminal device may choose to immediately execute the RRC handover process in response to the RRC handover command carried in the RRC handover message, or it may choose to execute the RRC handover process under certain conditions.

[0246] It is understood that, in the embodiments of this application, reconfiguration information can be used to indicate handover conditions. After receiving the RRCreesablishment sent by the first satellite base station, the terminal device can choose to respond to the handover conditions indicated by the reconfiguration information carried in the RRCreesablishment. When the handover conditions indicated by the configuration information are met, the terminal device initiates random access to the second satellite base station according to the reconfiguration information and sends a reconfiguration completion message to the second satellite base station.

[0247] For example, in some embodiments, the handover command included in the reconfiguration information carried in the re-establishment signaling RRCresablishment can also be configured as a conditional handover (CHO). The reconfiguration information can be used to indicate handover conditions, that is, the handover command included in the reconfiguration information can be a conditional handover command. When certain conditions are met, that is, when the handover conditions indicated by the reconfiguration information are met, such as when the signal of the adjacent satellite base station (the second satellite base station) is good enough and the signal of the current satellite base station is poor enough, the terminal device will execute the handover command and initiate random access to the second satellite base station. This configuration method is more flexible and can adapt to scenarios with more complex signal changes.

[0248] Exemplary, in some embodiments, Figure 15 A schematic diagram of the wireless communication method proposed in the embodiments of this application. Figure 2 ,like Figure 15 As shown, the following steps can be performed to implement the wireless communication method for the first satellite base station, the second satellite base station, and the terminal equipment in the NTN network:

[0249] Step 301: The terminal device sends a Reestablishment Request (RRCReestablishmentRequest).

[0250] Step 302: The first satellite base station uses the frequency hopping configuration parameter (nextHopChainingCount) to perform key update processing.

[0251] Step 312: If it is determined that the terminal device will not leave the coverage area, the first satellite base station will send a second establishment signaling to the terminal device.

[0252] In the embodiments of this application, if it is determined that the terminal device does not meet the triggering conditions for network handover, then the first satellite base station can directly send a second re-establishment signaling RRCReestablishment to the terminal device.

[0253] In the embodiments of this application, after determining that the terminal device does not meet the triggering conditions for network handover, the first satellite base station can send RRCReestablishment to the terminal device. The RRCReestablishment carries the nextHopChainingCount parameter (frequency hopping configuration parameter). The nextHopChainingCount parameter can be a parameter required to update the key. That is, after receiving the second establishment signaling RRCReestablishment, the terminal device can use the nextHopChainingCount parameter carried therein to update the current security key.

[0254] Step 308: The terminal device uses the frequency hopping configuration parameter nextHopChainingCount to perform key update processing.

[0255] Step 313: The terminal device performs re-establishment processing according to the second re-establishment signaling RRCReestablishment, and sends a re-establishment message RRCReestablishmentComplete to the first satellite base station.

[0256] It is understandable that in related technologies, when a terminal device leaves the coverage area of ​​a satellite base station, it is likely to enter, or has already entered, the coverage area of ​​another satellite base station. In this case, if the terminal initiates RRC re-establishment on the satellite base station it is about to leave coverage, it is likely to result in RRC re-establishment failure or subsequent RRC handover failure. For the special scenario in the aforementioned NTN network, the wireless communication method proposed in this application, considering the regular mobility of satellite base stations in the NTN network while the terminal device can be considered approximately stationary, enables the terminal to quickly hand over to an adjacent satellite base station, improving the success rate of RRC handover after RRC reconstruction and accelerating data transmission recovery.

[0257] In summary, through the wireless communication method proposed in steps 301 to 313 above, after receiving the re-establishment request sent by the terminal device, the first satellite base station can first determine whether the terminal device is about to leave the coverage area of ​​the first satellite base station, that is, determine whether the terminal device meets the triggering conditions for network handover. If it is determined that the terminal device may be about to leave the coverage area of ​​the first satellite base station, it can directly initiate a handover request to the second satellite base station and generate a first re-establishment signaling based on the reconfiguration information sent by the second satellite base station. This enables the terminal device to perform corresponding handover processing after receiving the first re-establishment signaling in order to switch to the second satellite base station.

[0258] In other words, the wireless communication method proposed in this application can avoid the situation in an NTN network where, after a ground terminal (terminal device) initiates RRC re-establishment, the satellite base station may soon lose coverage due to its own movement, thus preventing the timely control of the terminal to switch to a more suitable adjacent satellite base station. Because the mobility of satellite base stations is fully considered, the terminal device can directly perform handover processing after RRC re-establishment via the first re-establishment signaling carrying reconfiguration information issued by the first satellite base station, quickly switching to an adjacent satellite base station (second satellite base station). This improves the success rate of RRC handover after RRC reconstruction and solves the problem of data transmission interruption.

[0259] Exemplary, in some embodiments, Figure 16 This is a schematic diagram illustrating the implementation of a wireless communication method, such as... Figure 16 As shown, for the first satellite base station, the second satellite base station, and the terminal device in the NTN network, after receiving the RRCReestablishmentRequest sent by the terminal device, the first satellite base station first performs key update processing on the base station side using nextHopChainingCount, and then determines whether the terminal device is about to leave the coverage area (i.e., whether the terminal device meets the network handover triggering conditions). If it is about to leave, then part A needs to be executed, that is, it needs to first send an RRC handover request to the adjacent second satellite base station, and after receiving the RRCReconfiguration containing the RRC handover command sent by the second satellite base station, it uses the RRCReconfiguration as a PDCP data segment, uses the corresponding PDCPSN and the updated key to construct a PDCP data packet, then puts the constructed PDCP data packet into the RRCReestablishment, and sends the RRCReestablishment to the terminal device. If the terminal device will not leave the coverage area of ​​the first satellite base station, then the first satellite base station can directly send the RRCReestablishment to the terminal device.

[0260] Furthermore, in the embodiments of this application, after receiving the RRCReestablishment sent by the first satellite base station, the terminal device can first use the nextHopChainingCount carried in the RRCReestablishment to perform key update processing on the terminal side, and then determine whether there is a PDCP data packet in the extended field of the RRCReestablishment. If there is a PDCP data packet, then part C can be executed, that is, parsing the PDCP data packet, determining the RRCReconfiguration carried therein, and then initiating random access to the second satellite base station indicated by the RRCReconfiguration, and sending RRCReconfigurationComplete to the second satellite base station. If there is no PDCP data packet, then part B can be executed, that is, sending RRCReestablishmentComplete to the first satellite base station.

[0261] Understandably, in related schemes, the RRC re-establishment process is used to restore data transmission on SRB1. After RRC re-establishment, RRCReconfiguration is needed to further restore data transmission on SRB2 and DRB. However, the wireless communication method proposed in this application can merge the two RRC message flows of re-establishment signaling and reconfiguration information into a single RRC signaling flow, thereby reducing the signaling interaction time after RRC re-establishment by the terminal device.

[0262] Furthermore, the wireless communication method proposed in this application fully considers the security issues between terminal devices and satellite base stations in NTN networks. Since the RRC re-establishment process involves updating the security key, in this application, the newly introduced RRC handover command in the RRCReestablishment signaling takes the form of a PDCP data packet. This PDCP data packet undergoes integrity protection and encryption processing using the updated key.

[0263] It is understood that the wireless communication method proposed in the embodiments of this application can be applied to various communication systems, such as 4G (LTE) systems or 5G systems, taking 5G systems as an example.

[0264] This application provides a wireless communication method. After receiving a re-establishment request from a terminal device, a first satellite base station, if the terminal device meets the network handover triggering conditions, sends a handover request to a second satellite base station. After receiving reconfiguration information from the second satellite base station, it generates a first re-establishment signaling message, which includes the reconfiguration information. The first re-establishment signaling message is then sent to the terminal device to enable the terminal device to handover to the second satellite base station. After sending a re-establishment request to the first satellite base station, the terminal device receives the first re-establishment signaling message from the first satellite base station, which includes the reconfiguration information of the second satellite base station. The terminal device then hands over to the second satellite base station based on the reconfiguration information. Therefore, in the embodiments of this application, the first satellite base station can first determine whether the terminal device meets the handover triggering conditions. If the handover triggering conditions are met, the first satellite base station can send a handover request to the second satellite base station and generate a corresponding first re-establishment signaling using the reconfiguration information sent by the second satellite base station. After receiving the first re-establishment signaling sent by the first satellite base station, the terminal device can directly perform handover processing based on the reconfiguration information carried in the first re-establishment signaling to switch to the second satellite base station. In other words, in this application, by fully considering the mobility of satellite base stations in the NTN network, after an RRC re-establishment occurs and it is determined that the terminal device needs to perform network handover processing, the two RRC message flows of re-establishment signaling and reconfiguration information are merged into a single RRC signaling flow. This reduces the signaling interaction time after the terminal device undergoes RRC re-establishment, enabling the terminal device to quickly switch to the adjacent satellite base station (the second satellite base station), thereby solving the problem of data transmission interruption and improving communication performance.

[0265] Based on the above embodiments, in the embodiments of this application, further, Figure 17 Schematic diagram of the composition of the first satellite base station Figure 1 ,like Figure 17 As shown, the first satellite base station 10 proposed in this application embodiment may include a first processor 11, a second memory 12 storing instructions executable by the first processor 11, and further, the first satellite base station 10 may also include a first communication interface 13 and a first bus 14 for connecting the first processor 11, the first memory 12 and the first communication interface 13.

[0266] In the embodiments of this application, the first processor 11 can be at least one of the following: Application-Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), Central Processing Unit (CPU), Controller, Microcontroller, and Microprocessor. It is understood that for different devices, the electronic device used to implement the above-mentioned processor function can also be other types, and this application embodiment does not specifically limit this. The first satellite base station 10 may also include a first memory 12, which can be connected to the first processor 11. The first memory 12 is used to store executable program code, which includes computer operation instructions. The first memory 12 may include high-speed RAM memory and may also include non-volatile memory, such as at least two disk drives.

[0267] In embodiments of this application, the first bus 14 is used to connect the first communication interface 13, the first processor 11, and the first memory 12, as well as the mutual communication between these devices.

[0268] In embodiments of this application, the first memory 12 is used to store instructions and data.

[0269] Furthermore, in embodiments of this application, the first processor 11 described above is used for:

[0270] After receiving a re-establishment request from the terminal device, if the terminal device meets the network handover triggering conditions, a handover request is sent to the second satellite base station.

[0271] After receiving the reconfiguration information sent by the second satellite base station, a first re-establishment signaling is generated; wherein, the first re-establishment signaling includes the reconfiguration information;

[0272] The first re-establishment signaling is sent to the terminal device so that the terminal device switches to the second satellite base station.

[0273] In practical applications, the first memory 12 can be volatile memory, such as random-access memory (RAM); or non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD); or a combination of the above types of memory, and provide instructions and data to the first processor 11.

[0274] In the embodiments of this application, further, Figure 18 Schematic diagram of the composition of the first satellite base station Figure 2 ,like Figure 18 As shown, the first satellite base station 10 proposed in this embodiment may include a transmitting unit 15 and a generating unit 16.

[0275] The sending unit 15 is configured to send a handover request to the second satellite base station after receiving a re-establishment request from the terminal device, provided that the terminal device meets the triggering conditions for network handover.

[0276] The generation unit 16 is configured to generate a first re-establishment signaling after receiving the reconfiguration information sent by the second satellite base station; wherein the first re-establishment signaling includes the reconfiguration information;

[0277] The sending unit 15 is further configured to send the first re-establishment signaling to the terminal device so that the terminal device switches to the second satellite base station.

[0278] Furthermore, in this embodiment, the functional modules can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional module.

[0279] If the integrated unit is implemented as a software functional module and is not sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the method of this embodiment. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0280] Therefore, this application provides a computer-readable storage medium applied to a first satellite base station 10. The computer-readable storage medium stores a computer program, which, when executed by a first processor, implements the method described in any of the foregoing embodiments.

[0281] In the embodiments of this application, further, Figure 19 Schematic diagram of the composition structure of the terminal device Figure 1 ,like Figure 19 As shown, the terminal device 20 proposed in this application embodiment may include a second processor 21, a second memory 22 storing instructions executable by the second processor 21, and further, the terminal device 20 may also include a second communication interface 23 and a second bus 24 for connecting the second processor 21, the second memory 22 and the second communication interface 23.

[0282] In the embodiments of this application, the second processor 21 can be at least one of the following: Application-Specific Integrated Circuit (ASIC), Digital Signal Processor (DSP), Digital Signal Processing Device (DSPD), Programmable Logic Device (PLD), Field-Programmable Gate Array (FPGA), Central Processing Unit (CPU), Controller, Microcontroller, and Microprocessor. It is understood that for different devices, the electronic device used to implement the above-mentioned processor function can also be other types, and this application embodiment does not specifically limit this. The terminal device 20 may also include a second memory 22, which can be connected to the second processor 21. The second memory 22 is used to store executable program code, which includes computer operation instructions. The second memory 22 may include high-speed RAM memory and may also include non-volatile memory, such as at least two disk drives.

[0283] In embodiments of this application, the second bus 24 is used to connect the second communication interface 23, the second processor 21, and the second memory 22, as well as the mutual communication between these devices.

[0284] In embodiments of this application, the second memory 22 is used to store instructions and data.

[0285] Furthermore, in embodiments of this application, the second processor 21 is used for:

[0286] After sending a re-establishment request to the first satellite base station, the system receives a first re-establishment signaling message from the first satellite base station; wherein the first re-establishment signaling message includes reconfiguration information of the second satellite base station.

[0287] Switch to the second satellite base station based on the reconfiguration information.

[0288] In practical applications, the aforementioned memory 12 can be volatile memory, such as random-access memory (RAM); or non-volatile memory, such as read-only memory (ROM), flash memory, hard disk drive (HDD), or solid-state drive (SSD); or a combination of the above types of memory, and provide instructions and data to the processor 11.

[0289] In the embodiments of this application, further, Figure 20 Schematic diagram of the composition structure of the terminal device Figure 2 ,like Figure 20 As shown, the terminal device 20 proposed in this application embodiment may include a receiving unit 25 and a switching unit 26.

[0290] The receiving unit 25 is configured to receive a first re-establishment signaling sent by the first satellite base station after sending a re-establishment request to the first satellite base station; wherein the first re-establishment signaling includes reconfiguration information of the second satellite base station;

[0291] The switching unit 26 is used to switch to the second satellite base station according to the reconfiguration information.

[0292] Furthermore, in this embodiment, the functional modules can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional module.

[0293] If the integrated unit is implemented as a software functional module and is not sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this embodiment, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) or processor to execute all or part of the steps of the method of this embodiment. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0294] Therefore, this application provides a computer-readable storage medium applied to a terminal device 20. The computer-readable storage medium stores a computer program, which, when executed by a second processor, implements the method described in any of the foregoing embodiments.

[0295] This application provides a first satellite base station and a terminal device. After receiving a re-establishment request from the terminal device, the first satellite base station sends a handover request to a second satellite base station if the terminal device meets the network handover triggering conditions. After receiving reconfiguration information from the second satellite base station, the first satellite base station generates a first re-establishment signaling message, which includes the reconfiguration information. The first re-establishment signaling message is then sent to the terminal device to enable the terminal device to handover to the second satellite base station. After sending a re-establishment request to the first satellite base station, the terminal device receives the first re-establishment signaling message from the first satellite base station, which includes the reconfiguration information from the second satellite base station. The terminal device then hands over to the second satellite base station based on the reconfiguration information. Therefore, in the embodiments of this application, the first satellite base station can first determine whether the terminal device meets the handover triggering conditions. If the handover triggering conditions are met, the first satellite base station can send a handover request to the second satellite base station and generate a corresponding first re-establishment signaling using the reconfiguration information sent by the second satellite base station. After receiving the first re-establishment signaling sent by the first satellite base station, the terminal device can directly perform handover processing based on the reconfiguration information carried in the first re-establishment signaling to switch to the second satellite base station. In other words, in this application, by fully considering the mobility of satellite base stations in the NTN network, after an RRC re-establishment occurs and it is determined that the terminal device needs to perform network handover processing, the two RRC message flows of re-establishment signaling and reconfiguration information are merged into a single RRC signaling flow. This reduces the signaling interaction time after the terminal device undergoes RRC re-establishment, enabling the terminal device to quickly switch to the adjacent satellite base station (the second satellite base station), thereby solving the problem of data transmission interruption and improving communication performance.

[0296] This application provides a chip, which includes programmable logic circuits and / or program instructions. When the chip is running, it implements the wireless communication method described above, including the following steps:

[0297] After receiving a re-establishment request from the terminal device, if the terminal device meets the network handover triggering conditions, a handover request is sent to the second satellite base station.

[0298] After receiving the reconfiguration information sent by the second satellite base station, a first re-establishment signaling is generated; wherein, the first re-establishment signaling includes the reconfiguration information;

[0299] The first re-establishment signaling is sent to the terminal device so that the terminal device switches to the second satellite base station.

[0300] Furthermore, in the embodiments of this application, when the chip is running to implement the wireless communication method as described above, the following steps are also included:

[0301] After sending a re-establishment request to the first satellite base station, the system receives a first re-establishment signaling message from the first satellite base station; wherein the first re-establishment signaling message includes reconfiguration information of the second satellite base station.

[0302] Switch to the second satellite base station based on the reconfiguration information.

[0303] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of hardware embodiments, software embodiments, or embodiments combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage and optical storage) containing computer-usable program code.

[0304] This application is described with reference to schematic and / or block diagrams of implementations of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the schematic and / or block diagrams can be implemented by computer program instructions, and combinations of blocks in the schematic and / or block diagrams can be implemented. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the schematic and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0305] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in the implementation flow diagram. Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0306] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0307] The above description is merely a preferred embodiment of this application and is not intended to limit the scope of protection of this application.

Claims

1. A wireless communication method applied to a first satellite base station, characterized by, The method comprises: After receiving the re-establishment request sent by the terminal device, if the terminal device meets the triggering condition of network switching, a switching request is sent to the second satellite base station; After receiving the reconfiguration information sent by the second satellite base station, a first re-establishment signaling is generated; wherein the first re-establishment signaling comprises the reconfiguration information; The first re-establishment signaling is sent to the terminal device to make the terminal device switch to the second satellite base station; The method further comprises: Based on the relative position parameter between the terminal device, if the terminal device is in a first preset area and moves away from the first satellite base station, it is determined that the terminal device meets the triggering condition of network switching; wherein the first preset area comprises the edge area in the coverage area corresponding to the first satellite base station.

2. The method of claim 1, wherein, The method further comprises: According to the relative position parameter of the terminal device, the second satellite base station is determined.

3. The method of claim 1, wherein, The first re-establishment signaling carries encrypted data packets comprising the reconfiguration information and frequency hopping configuration parameters, and the frequency hopping configuration parameters are used to decrypt the encrypted data packets.

4. The method of claim 3, wherein, After receiving the re-establishment request sent by the terminal device, the method further comprises: According to the frequency hopping configuration parameters, key update processing is performed to determine the updated key; The first re-establishment signaling is generated, comprising: According to the delay non-critical extension parameter, the reconfiguration information and the updated key, the encrypted data packets are constructed; Based on the encrypted data packets, the first re-establishment signaling is generated.

5. The method of claim 1, wherein, The method further comprises: If the terminal device is in a second preset area, it is determined that the terminal device does not meet the triggering condition of network switching; wherein the second preset area comprises a non-edge area in the coverage area corresponding to the first satellite base station; Or, If the terminal device is in the first preset area and moves close to the first satellite base station, it is determined that the terminal device does not meet the triggering condition of network switching.

6. The method of claim 1, wherein, After receiving the re-establishment request sent by the terminal device, the method further comprises: If the terminal device does not meet the triggering condition of network switching, a second re-establishment signaling is sent to the terminal device; The re-establishment message sent by the terminal device is received.

7. A wireless communication method applied to a terminal device, characterized by, The method comprises: After sending a re-establishment request to the first satellite base station, a first re-establishment signaling sent by the first satellite base station is received; wherein, if the terminal device meets the triggering condition of network switching, the first re-establishment signaling comprises the reconfiguration information of the second satellite base station; wherein, based on the relative position parameter between the first satellite base station and the terminal device, if the terminal device is in a first preset area and moves away from the first satellite base station, the terminal device meets the triggering condition of network switching; wherein the first preset area comprises the edge area in the coverage area corresponding to the first satellite base station; According to the reconfiguration information, the terminal device switches to the second satellite base station.

8. The method of claim 7, wherein, The first re-establishment signaling carries an encrypted data packet including the reconfiguration information and a frequency hopping configuration parameter, and the method further comprises: decrypting the encrypted data packet according to the frequency hopping configuration parameter to obtain the reconfiguration information.

9. The method of claim 8, wherein, The switching to the second satellite base station comprises: initiating random access to the second satellite base station according to the reconfiguration information and sending a reconfiguration completion message to the second satellite base station.

10. The method of claim 8, wherein, The reconfiguration information is used to indicate a switching condition, and the switching to the second satellite base station comprises: when the switching condition is met, initiating random access to the second satellite base station according to the reconfiguration information and sending a reconfiguration completion message to the second satellite base station.

11. The method of claim 8, wherein, The method further comprises: after sending the re-establishment request to the first satellite base station, receiving second re-establishment signaling sent by the first satellite base station; performing re-establishment processing according to the second re-establishment signaling and sending a re-establishment message to the first satellite base station.

12. The method of claim 8, wherein, The decrypting the encrypted data packet according to the frequency hopping configuration parameter comprises: performing secret key update processing according to the frequency hopping configuration parameter to determine an updated secret key; decrypting the encrypted data packet according to the updated secret key.

13. A first satellite base station, the first satellite base station comprising: The first satellite base station comprises a sending unit and a generating unit, The sending unit is configured to, after receiving a re-establishment request sent by a terminal device, send a switching request to a second satellite base station if the terminal device meets a triggering condition of network switching; wherein, based on a relative position parameter between the terminal device and the first satellite base station, if the terminal device is located in a first preset area and moves away from the first satellite base station, it is determined that the terminal device meets the triggering condition of network switching; wherein, the first preset area includes an edge area in a coverage area corresponding to the first satellite base station. The generating unit is configured to, after receiving reconfiguration information sent by the second satellite base station, generate first re-establishment signaling; wherein, the first re-establishment signaling includes the reconfiguration information. The sending unit is further configured to send the first re-establishment signaling to the terminal device, so that the terminal device switches to the second satellite base station.

14. A first satellite base station, the first satellite base station comprising: The first satellite base station comprises a first processor and a first memory storing executable instructions of the first processor, and when the instructions are executed by the first processor, the method of any one of claims 1-6 is implemented.

15. A terminal device, comprising: The terminal device comprises a receiving unit and a switching unit, The receiving unit is configured to receive first re-establishment signaling sent by the first satellite base station after sending a re-establishment request to the first satellite base station; wherein the first re-establishment signaling comprises reconfiguration information of a second satellite base station in a case where the terminal device meets a trigger condition of network switching; wherein the trigger condition of network switching is determined based on a relative position parameter between the first satellite base station and the terminal device, in a case where the terminal device is located in a first preset area and the terminal device moves away from the first satellite base station; and wherein the first preset area comprises an edge area in a coverage area corresponding to the first satellite base station. The switching unit is configured to switch to the second satellite base station according to the reconfiguration information.

16. A terminal device, comprising: The terminal device comprises a second processor and a second memory storing instructions executable by the second processor, and the instructions, when executed by the second processor, implement the method of any one of claims 7-12.

17. A chip, characterized by The chip comprises programmable logic circuitry and / or program instructions, and when the chip is running, the method of any one of claims 1-6 or 7-12 is implemented.

18. A computer readable storage medium, characterized in that, The computer readable storage medium stores a computer program, and the computer program, when executed, implements the method of any one of claims 1-6 or the method of any one of claims 7-12. ​

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