Cell switching method and device, communication equipment and storage medium

Abstract

The embodiments of the present disclosure provide a cell switching method and apparatus, a communication device and a storage medium, wherein the cell switching method can be executed by a terminal. The method includes: receiving configuration information of measurement parameters sent by a base station; determining the relative position information of the terminal and the satellite according to the configuration information, wherein the relative position information includes: a first distance and a second distance, the first distance is the distance of the terminal's position relative to the position of the serving cell, and the second distance is the distance of the terminal's position relative to the position of at least one candidate target cell; in response to the first distance being greater than or equal to a first distance threshold and the second distance being less than or equal to a third distance threshold, determining the measurement information of the serving cell and / or at least one candidate target cell; reporting the measurement information to the base station, and the measurement information is used for the base station to determine whether to perform conditional switching.

Description

[0001] The present disclosure is a divisional application of the Chinese application with the application date of December 8, 2020, the application number of 202080003914.7 and the invention name of “Cell Switching Method and Apparatus, Communication Equipment and Storage Medium”. Technical Field

[0002] The embodiments of the present disclosure relate to the field of wireless communications but are not limited to the field of wireless communications, and in particular, relate to a cell switching method and apparatus, a communication device, and a storage medium. Background Art

[0003] In wireless communications, in order to reduce the occurrence of connection failures and other problems during the movement of terminals, the relevant technology introduces CHO (Conditional Handover). Through CHO, the network can pre-configure multiple candidate target cells for the terminal and send a handover command to the terminal when the network conditions are good.

[0004] However, for NTN (Non-Terrestrial Network), due to the large propagation path and large signal transmission delay, the traditional switching method is not suitable for NTN system. At the same time, using the CHO method, it is difficult for the terminal to accurately trigger the measurement reporting mechanism, which easily causes switching failure. Summary of the invention

[0005] The present disclosure provides a cell switching method and apparatus, a communication device and a storage medium.

[0006] According to a first aspect of an embodiment of the present disclosure, a cell switching method is provided, which is applied in a terminal, and includes:

[0007] Based on the relative position information between the terminal and the satellite, the measurement information of the satellite cell is determined.

[0008] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0009] A first distance between the position of the terminal and the center position of the serving cell;

[0010] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0011] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0012] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0013] In some embodiments, determining the measurement information of the satellite cell based on the relative position information between the terminal and the satellite includes:

[0014] In response to the first distance being greater than or equal to a first distance threshold, determining measurement information of the satellite cell;

[0015] and / or

[0016] In response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold, measurement information of the satellite cell is determined.

[0017] In some embodiments, determining the measurement information of the satellite cell based on the relative position information between the terminal and the satellite includes:

[0018] Based on the relative position information between the terminal and the satellite and the reference signal quality information, the measurement information of the satellite cell is determined; wherein the reference signal quality information includes: the reference signal quality information of at least one candidate target cell and / or the reference signal quality information of the serving cell.

[0019] In some embodiments, the determining the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and the reference signal quality information includes:

[0020] In response to the first distance being greater than or equal to a second distance threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold, reporting the measurement information of the satellite cell;

[0021] and / or

[0022] In response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold, reporting the measurement information of the satellite cell.

[0023] In some embodiments, the determining the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and the reference signal quality information includes:

[0024] In response to the second distance being less than or equal to a third distance threshold, and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold, determining measurement information of the satellite cell;

[0025] and / or

[0026] In response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold, and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold, measurement information of the satellite cell is determined.

[0027] In some embodiments, the method further comprises:

[0028] Receive configuration information of a candidate target cell sent by a base station; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

[0029] In some embodiments, the measurement information of the satellite cell includes: a handover request requesting handover to the candidate target cell.

[0030] In some embodiments, the method further comprises:

[0031] Receive configuration information of measurement parameters sent by the base station;

[0032] The relative position information is determined according to the configuration information of the measurement parameters.

[0033] In some embodiments, the method further comprises:

[0034] Receive satellite position, satellite speed and time information PVT broadcast by satellite;

[0035] According to the PVT, relative position information between the terminal and the satellite is determined.

[0036] In some embodiments, the method further includes: reporting measurement information of the satellite cell.

[0037] According to a second aspect of an embodiment of the present disclosure, a cell switching method is provided, the method being applied to a base station, comprising:

[0038] The receiving terminal reports measurement information of the satellite cell based on the relative position information between the terminal and the satellite.

[0039] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0040] A first distance between the position of the terminal and the center position of the serving cell;

[0041] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0042] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0043] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0044] In some embodiments, the receiving terminal reports measurement information of a satellite cell based on relative position information between the terminal and the satellite, including:

[0045] receiving measurement information of a satellite cell reported by the terminal in response to the first distance being greater than or equal to a first distance threshold;

[0046] and / or

[0047] Receive measurement information of a satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold.

[0048] In some embodiments, the receiving terminal reports measurement information of a satellite cell based on relative position information between the terminal and the satellite, including:

[0049] The receiving terminal reports the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and the reference signal quality information; wherein the reference signal quality information includes: reference quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0050] In some embodiments, the receiving terminal reports the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and the reference signal quality information, including:

[0051] Receiving measurement information of a satellite cell reported by the terminal in response to the first distance being reported to be greater than or equal to a second distance threshold and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold;

[0052] and / or

[0053] The measurement information of the satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold is received.

[0054] In some embodiments, the receiving terminal reports the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and the reference signal quality information, including:

[0055] receiving measurement information of a satellite cell reported by the terminal in response to the second distance being less than or equal to a third distance threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold;

[0056] and / or

[0057] The measurement information of the satellite cell reported by the terminal in response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold is received.

[0058] In some embodiments, the method further comprises:

[0059] Sending configuration information of candidate target cells; wherein the configuration information of the candidate target cells is used to configure the candidate target cells for conditional handover CHO of the terminal.

[0060] In some embodiments, the method further comprises:

[0061] Based on the coverage of the satellite, configuration information of the measurement parameters is sent down; wherein the configuration information of the measurement parameters is used for the terminal to determine the relative position information.

[0062] According to a third aspect of an embodiment of the present disclosure, a cell switching device is provided, the device being applied to a terminal, including:

[0063] The first reporting module is configured to determine the measurement information of the satellite cell based on the relative position information between the terminal and the satellite.

[0064] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0065] A first distance between the position of the terminal and the center position of the serving cell;

[0066] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0067] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0068] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0069] In some embodiments, the first reporting module includes:

[0070] A first reporting submodule, configured to determine the measurement information of the satellite cell in response to the first distance being greater than or equal to a first distance threshold;

[0071] and / or

[0072] The second reporting submodule is configured to determine the measurement information of the satellite cell in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold.

[0073] In some embodiments, the first reporting module includes:

[0074] The third reporting submodule is configured to determine the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and the reference signal quality information; wherein the reference signal quality information includes: reference signal quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0075] In some embodiments, the third reporting submodule includes:

[0076] a fourth reporting submodule, configured to determine the measurement information of the satellite cell in response to the first distance being greater than or equal to a second distance threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold;

[0077] and / or

[0078] The fifth reporting submodule is configured to determine the measurement information of the satellite cell in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold.

[0079] In some embodiments, the third reporting submodule includes:

[0080] a sixth reporting submodule, configured to determine the measurement information of the satellite cell in response to the second distance being less than or equal to a third distance threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold;

[0081] and / or

[0082] The seventh reporting submodule is configured to determine the measurement information of the satellite cell in response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold.

[0083] In some embodiments, any of the above-mentioned reporting modules / reporting submodules may be configured to report the measurement information of the satellite cell.

[0084] In some embodiments, the apparatus further comprises:

[0085] The first receiving module is configured to receive configuration information of a candidate target cell sent by a base station; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

[0086] In some embodiments, the measurement information of the satellite cell includes: a handover request requesting handover to the candidate target cell.

[0087] In some embodiments, the apparatus further comprises:

[0088] A second receiving module is configured to receive configuration information of measurement parameters sent by the base station;

[0089] The first determination module is configured to determine the relative position information according to the configuration information of the measurement parameters.

[0090] In some embodiments, the apparatus further comprises:

[0091] A third receiving module is configured to receive satellite position, satellite speed and time information PVT broadcasted by a satellite;

[0092] The second determination module is configured to determine the relative position information between the terminal and the satellite according to the PVT.

[0093] According to a fourth aspect of an embodiment of the present disclosure, a cell switching device is provided, the device being applied to a base station, including:

[0094] The fourth receiving module is configured to receive measurement information of the satellite cell reported by the terminal based on the relative position information between the terminal and the satellite.

[0095] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0096] A first distance between the position of the terminal and the center position of the serving cell;

[0097] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0098] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0099] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0100] In some embodiments, the fourth receiving module includes:

[0101] A first receiving submodule, configured to receive measurement information of a satellite cell reported by the terminal in response to the first distance being greater than or equal to a first distance threshold;

[0102] and / or

[0103] The second receiving submodule is configured to receive measurement information of a satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold.

[0104] In some embodiments, the fourth receiving module includes:

[0105] The third receiving submodule is configured to receive measurement information of the satellite cell reported by the terminal based on the relative position information between the terminal and the satellite and the reference signal quality information; wherein the reference signal quality information includes: reference quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0106] In some embodiments, the third receiving submodule includes:

[0107] a fourth receiving submodule, configured to receive measurement information of a satellite cell reported by the terminal in response to the first distance being reported to be greater than or equal to a second distance threshold, and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold;

[0108] and / or

[0109] The fifth receiving submodule is configured to receive the measurement information of the satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold.

[0110] In some embodiments, the third receiving submodule includes:

[0111] a sixth receiving submodule, configured to receive measurement information of a satellite cell reported by the terminal in response to the second distance being less than or equal to a third distance threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold;

[0112] and / or

[0113] The seventh receiving submodule is configured to receive the measurement information of the satellite cell reported by the terminal in response to the second minimum elevation angle value being greater than or equal to the second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold.

[0114] In some embodiments, the apparatus further comprises:

[0115] The first sending module is configured to send configuration information of a candidate target cell; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

[0116] In some embodiments, the apparatus further comprises:

[0117] The second sending module is configured to send configuration information of measurement parameters based on the coverage of the satellite; wherein the configuration information of the measurement parameters is used for the terminal to determine the relative position information.

[0118] According to a fifth aspect of an embodiment of the present disclosure, a communication device is provided, the communication device comprising at least: a processor and a memory for storing executable instructions that can be run on the processor, wherein:

[0119] When the processor is used to run the executable instructions, the executable instructions execute the steps in any one of the above-mentioned cell switching methods.

[0120] According to a sixth aspect of an embodiment of the present disclosure, a non-temporary computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, implement the steps in any of the above-mentioned cell switching methods.

[0121] The disclosed embodiments provide a cell switching method and apparatus, a communication device, and a storage medium. Through the technical solution of the disclosed embodiments, a terminal can report the measurement information of a satellite cell to a base station based on the relative position relationship between the terminal and the satellite, thereby facilitating the base station and the terminal to perform operations such as conditional cell switching based on the measurement information corresponding to the relative position relationship. Compared with the method in which the terminal only detects the signal quality, the reliability and practicality of the measurement information are improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0122] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present invention and, together with the description, serve to explain the principles of the embodiments of the present invention.

[0123] Figure 1 is a schematic structural diagram of a wireless communication system according to an exemplary embodiment;

[0124] Figure 2 A schematic diagram of a cell switching method according to an exemplary embodiment Figure 1 ;

[0125] Figure 3 A schematic diagram of a cell switching method according to an exemplary embodiment Figure 2 ;

[0126] Figure 4 A schematic diagram of a cell switching method according to an exemplary embodiment Figure 3 ;

[0127] Figure 5A schematic diagram of a cell switching method according to an exemplary embodiment Figure 4 ;

[0128] Figure 6 A schematic diagram of a cell switching method according to an exemplary embodiment Figure 5 ;

[0129] Figure 7 A schematic diagram of a cell switching method according to an exemplary embodiment Figure 6 ;

[0130] Figure 8 A schematic diagram of a cell switching method according to an exemplary embodiment Figure 7 ;

[0131] Fig. 9 A structural frame of a cell switching device according to an exemplary embodiment is shown Figure 1 ;

[0132] Fig.10 A structural frame of a cell switching device according to an exemplary embodiment is shown Figure 2 ;

[0133] Fig.11 is a schematic diagram of a communication device according to an exemplary embodiment Figure 1 ;

[0134] Fig.12 is a schematic diagram of a communication device according to an exemplary embodiment Figure 2 . DETAILED DESCRIPTION

[0135] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the embodiments of the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the embodiments of the present disclosure as detailed in the appended claims.

[0136] The terms used in the disclosed embodiments are only for the purpose of describing specific embodiments and are not intended to limit the disclosed embodiments. The singular forms of "a", "an" and "the" used in the disclosed embodiments and the appended claims are also intended to include plural forms unless the context clearly indicates other meanings. It should also be understood that the term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items.

[0137] It should be understood that although the terms first, second, third, etc. may be used to describe various information in the disclosed embodiments, these information should not be limited to these terms. These terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the disclosed embodiments, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the words "if" and "if" as used herein may be interpreted as "at" or "when" or "in response to determination".

[0138] In order to better describe any embodiment of the present disclosure, an embodiment of the present disclosure is illustratively described by taking an application scenario of access control as an example.

[0139] Please refer to Figure 1 , which shows a schematic diagram of the structure of a wireless communication system provided by an embodiment of the present disclosure. Figure 1 As shown, the wireless communication system is a communication system based on cellular mobile communication technology, and the wireless communication system may include: a plurality of terminals 11 and a plurality of base stations 12 .

[0140] Among them, the terminal 11 can be a device that provides voice and / or data connectivity to the user. The terminal 11 can communicate with one or more core networks via a radio access network (RAN). The terminal 11 can be an Internet of Things terminal, such as a sensor device, a mobile phone (or a "cellular" phone), and a computer with an Internet of Things terminal. For example, it can be a fixed, portable, pocket-sized, handheld, computer-built-in or vehicle-mounted device. For example, a station (STA), a subscriber unit, a subscriber station, a mobile station, a mobile station, a remote station, an access point, a remote terminal, an access terminal, a user terminal, a user agent, a user device, or a user terminal (user equipment, terminal). Alternatively, the terminal 11 can also be a device of an unmanned aerial vehicle. Alternatively, the terminal 11 can also be a vehicle-mounted device, for example, it can be a driving computer with wireless communication function, or a wireless terminal connected to an external driving computer. Alternatively, the terminal 11 may also be a roadside device, for example, a street lamp, a signal lamp or other roadside device with a wireless communication function.

[0141] The base station 12 may be a network-side device in a wireless communication system. The wireless communication system may be a fourth generation mobile communication technology (4G) system, also known as a long term evolution (LTE) system; or, the wireless communication system may be a 5G system, also known as a new radio (NR) system or a 5G NR system. Alternatively, the wireless communication system may be any generation system after the 5G system. The access network in the 5G system may be referred to as NG-RAN (New Generation-Radio Access Network).

[0142] Among them, the base station 12 can be an evolved base station (eNB) adopted in the 4G system. Alternatively, the base station 12 can also be a base station (gNB) adopting a centralized distributed architecture in the 5G system. When the base station 12 adopts a centralized distributed architecture, it usually includes a centralized unit (CU) and at least two distributed units (DU). The centralized unit is provided with a protocol stack of a packet data convergence protocol (PDCP) layer, a radio link layer control protocol (RLC) layer, and a media access control (MAC) layer; the distributed unit is provided with a physical (Physical, PHY) layer protocol stack. The specific implementation method of the base station 12 is not limited in the embodiment of the present disclosure.

[0143] A wireless connection can be established between the base station 12 and the terminal 11 through a wireless air interface. In different implementations, the wireless air interface is a wireless air interface based on the fourth generation mobile communication network technology (4G) standard; or, the wireless air interface is a wireless air interface based on the fifth generation mobile communication network technology (5G) standard, for example, the wireless air interface is a new air interface; or, the wireless air interface can also be a wireless air interface based on the next generation mobile communication network technology standard of 5G.

[0144] In some embodiments, E2E (End to End) connections may also be established between the terminals 11, such as V2V (vehicle to vehicle) communication, V2I (vehicle to Infrastructure) communication, and V2P (vehicle to pedestrian) communication in vehicle to everything (V2X) communication.

[0145] In some embodiments, the wireless communication system may further include a network management device 13 .

[0146] Several base stations 12 are respectively connected to a network management device 13. The network management device 13 may be a core network device in a wireless communication system. For example, the network management device 13 may be a mobility management entity (MME) in an evolved packet core (EPC). Alternatively, the network management device may be other core network devices, such as a serving gateway (SGW), a public data network gateway (PGW), a policy and charging rules function (PCRF), or a home subscriber server (HSS). The implementation form of the network management device 13 is not limited in the embodiments of the present disclosure.

[0147] In some embodiments, in order to save power consumption of UE (User Equipment), the network can configure DRX for UE. When the UE is in a connected state, the DRX configuration includes an inactivity timer, an on duration timer, a cycle, and a starting offset, an uplink HARQ RTT (Hybrid Automatic Repeat request Round-TripTime) timer, a downlink HARQ RTT timer, an uplink retransmission timer, a downlink retransmission timer, etc. The cycle and the starting offset can be used to determine the periodic starting time point of the wake-up timer. Whenever the UE receives a DCI (Downlink Control Information) carrying its own C-RNTI (Cell-Radio Network Temporary Identifier) ​​on the PDCCH (Physical Downlink Control Channel), the inactivity timer will be started. The UE only monitors the PDCCH channel during the wake-up period, and the UE may not monitor the PDCCH channel at other times, thereby saving power consumption. When the UE receives a MAC PDU (Protocol Data Unit), it sends feedback to the base station and starts the downlink HARQ RTT timer of the corresponding HARQ process. When the downlink HARQ RTT timer times out, the downlink retransmission timer is started. When the UE sends a PUSCH transmission, the UE starts the uplink HARQ RTT timer of the corresponding HARQ process. When the uplink HARQ RTT timer times out, the uplink retransmission timer is started. The wake-up time includes the wake-up timer, inactivity timer, uplink retransmission timer, and downlink retransmission timer.

[0148] In order to reduce the number of connection failures during user mobility, conditional handover (CHO) is introduced, for example, cell handover failure or connection failure before cell handover is triggered. In the traditional handover process, the network only configures one target cell for cell handover, while in CHO, unlike the traditional handover method, the network pre-configures multiple candidate target cells. When the connection conditions are good, the network can send a handover command to the terminal UE earlier than the traditional handover, instead of waiting for the network connection conditions to deteriorate as in the traditional handover to send the handover command. When receiving the command, the terminal UE will store the command instead of executing it immediately. When a configured candidate target cell meets the configured conditions, the terminal UE starts to execute the stored command, and then the terminal UE executes the handover command and connects to the target cell like the traditional handover.

[0149] In some embodiments, the following two measurement reporting events are used for CHO switching:

[0150] Handover condition A3: The candidate cell in CHO reconfiguration has better signal condition than Pcell (Primary Cell) or PSCell (Primary Secondary Cell);

[0151] Switching condition A5: The signal quality of the Pcell or PSCell is worse than the absolute threshold 1 and the signal quality of the candidate cell in CHO reconfiguration is better than the absolute threshold 2.

[0152] In the NTN system, due to the huge transmission delay and the little change in the measured signal quality, the traditional cell switching method may not be applicable. The CHO switching method can better avoid the problems of failure to receive the switching command or untimely switching.

[0153] like Figure 2 As shown, an embodiment of the present disclosure provides a cell switching method, which is applied in a terminal and includes:

[0154] Step S101: Determine measurement information of a satellite cell based on relative position information between a terminal and a satellite.

[0155] In the disclosed embodiment, the relative position information between the terminal and the satellite may be determined by means of satellite cell measurement.

[0156] In some embodiments, the terminal may report the determined relative position information between the terminal and the satellite to the base station.

[0157] The terminal can be detected through a positioning system, such as GNSS (Global Navigation Satellite System) or GPS (Global Positioning System). Through positioning, the terminal can obtain its current geographical location information, or obtain the relative position information of the terminal and the satellites within the coverage area.

[0158] The terminal knows its current geographical location, and can obtain the satellite position, ephemeris information or PVT (Satellite position, velocity, and time information) broadcast by the satellite. By calculating the information related to its own geographical location and the position of the satellite, the relative position information of the terminal and the satellite is obtained.

[0159] In the disclosed embodiment, the relative position information between the terminal and the satellite may include: relative distance, relative distance between the terminal and the center of the satellite cell covered by the satellite, and minimum elevation angle value at which the terminal can receive satellite signals within the satellite coverage area.

[0160] The above measurement information may include one or more relative position information, or may be data calculated or processed based on the relative position information. For example, based on the relative position information between the terminal and the satellite, the measured position relationship such as the signal strength and signal quality of the satellite cell and the coverage range of the cell and the distance between the terminal and the satellite.

[0161] The terminal reports the satellite cell measurement information for the base station to determine whether the cell switching conditions are met and perform CHO. Alternatively, the terminal reports the satellite cell measurement information for the base station to determine that the communication status between the current terminal cell and the terminal is good, so there is no need to perform CHO.

[0162] Compared with CHO which only supports switching based on reference signal quality, the disclosed embodiment takes into account the relative position relationship between the terminal and the satellite, and reports the measurement information of the satellite cell based on the relative position information, providing CHO with more options for switching conditions, thereby enhancing the CHO switching method and improving the switching performance in the NTN system.

[0163] In some embodiments, the satellite cell includes: a serving cell where the terminal is located and / or at least one candidate target cell; and the relative position information between the terminal and the satellite includes at least one of the following:

[0164] A first distance between the position of the terminal and the center position of the serving cell;

[0165] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0166] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0167] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0168] In the disclosed embodiment, the terminal can determine the measurement information of the satellite cell according to the relative position information between itself and the satellite. The satellite cell may include one or more cells within the coverage of a single satellite, or one or more cells respectively covered within the coverage of multiple satellites.

[0169] The one or more cells may include a serving cell where the terminal is located, which establishes a communication connection with the terminal and provides communication services for the terminal. If the communication quality of the terminal in the serving cell is poor or the communication quality of the neighboring cell is good, the terminal can switch to the neighboring cell by cell reselection, redirection or cell switching.

[0170] Here, the candidate target cell may include one or more neighboring cells of the serving cell where the terminal is located. Therefore, the terminal may switch to the candidate target cell when performing the above-mentioned cell reselection, redirection or cell switching.

[0171] In the disclosed embodiment, the candidate target cell may be a cell pre-selected or determined by the base station according to the serving cell where the terminal is currently located, and the candidate target cell is sent to the terminal by a configuration method. In this way, the terminal can switch to the candidate target cell when the cell switching condition is met.

[0172] In the disclosed embodiment, the relative position information between the terminal and the satellite may include the relative position relationship between the terminal and the satellite, or the relative position relationship between the terminal and the above-mentioned service cell or candidate target cell covered by the satellite, including: distance, angle, direction, etc.

[0173] Exemplarily, the relative position information between the terminal and the satellite may include a first distance between the terminal's position and the center position of the serving cell. Here, the terminal's position may be a geographical location obtained by the terminal through positioning. The serving cell is a cell where the terminal is located and provides communication services for the terminal. The center position of the serving cell may be the location of a serving base station of the serving cell, or the geometric center of the geographical range covered by the serving cell, or the center position specified by the serving cell.

[0174] The above relative position information may also include a second distance between the terminal's position and the center position of at least one candidate target cell. The at least one candidate target cell may be a candidate cell that the terminal can switch to and that is pre-configured by the base station, and may include one or more neighboring cells of the serving cell. Similar to the serving cell, the center position of the candidate target cell is the location of the base station of the candidate target cell, the geometric center, or the center position specified by the candidate target cell itself. The second distance is the distance between the terminal's geographical location and the center position of the candidate target cell.

[0175] It can be understood that the smaller the above-mentioned first distance is, the higher the possibility that the terminal has good communication quality in the serving cell; the smaller the second distance is, the higher the possibility that the terminal has good communication quality after switching to the candidate target cell. Therefore, if the first distance is greater than or equal to the predetermined first threshold, and the second distance is less than or equal to the predetermined second threshold, the terminal can obtain better communication quality by switching to the candidate target cell. On the contrary, if the first distance is less than or equal to the predetermined first threshold, and the second distance is greater than or equal to the predetermined second threshold, the communication quality obtained by the terminal after switching to the candidate target cell may deteriorate, so there is no need to switch. In addition, if the above-mentioned first distance is greater than or equal to the first threshold, and the second distance is greater than or equal to the second threshold, the terminal may find it difficult to obtain good communication quality in both cells; or, if the first distance is less than or equal to the first threshold, and the second distance is less than or equal to the second threshold, the terminal may be able to obtain good communication quality in both cells; at this time, it can be decided to switch cells or keep the position unchanged or not switch according to other conditions or related communication protocols or UE itself.

[0176] In addition, the above relative position information may also include: the first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the service cell. Since the satellite revolves around the earth, the coverage range of the satellite is affected by the shape of the earth. The angle between the line between a certain ground position and the satellite and the horizon is the elevation angle from the position to the satellite. The first minimum elevation angle value is the minimum elevation angle value of the range in which the terminal can receive the satellite signal corresponding to the service cell. When the elevation angle value from the terminal to the satellite is less than the first minimum elevation angle value, the satellite signal cannot be received. Therefore, the elevation angle value of the actual position of the terminal needs to be greater than the first minimum elevation angle value, otherwise it is necessary to switch cells.

[0177] Here, the relative position information may also include the second minimum elevation angle value. If the elevation angle value of the actual position of the terminal is greater than the second minimum elevation angle value, the terminal can receive the satellite signal corresponding to the candidate target cell. Therefore, if the communication quality of the terminal in the serving cell is poor, the terminal can be switched to the candidate target cell. On the contrary, if the elevation angle value of the actual position of the terminal is less than the second minimum elevation angle value, the terminal cannot be switched to the candidate target cell.

[0178] The present disclosure provides a method for cell switching, which is applied to a terminal and includes:

[0179] In response to a first distance of the position of the terminal relative to the center position of the serving cell being greater than or equal to a first distance threshold, determining measurement information of the satellite cell;

[0180] and / or

[0181] In response to a first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell being less than or equal to a first minimum elevation angle threshold, measurement information of the satellite cell is determined.

[0182] In some embodiments, the terminal may report the determined relative position information between the terminal and the satellite to the base station.

[0183] Here, the service cell is a cell that provides communication services for the terminal. The location of the terminal can be the geographical location of the terminal or the location of the terminal relative to a predetermined reference object, such as the location of the terminal relative to the service cell base station. If the above-mentioned first distance is greater than or equal to the first distance threshold, the terminal may be at the edge of the service cell or at a location with poor signal quality. Therefore, at this time, the terminal can determine the measurement information of the satellite cell to further determine whether the cell switching can be performed. Of course, if whether to switch is determined by the network side, the measurement information of the satellite cell can be reported to the network side (such as the base station).

[0184] Here, the first minimum elevation angle value of the terminal is the minimum elevation angle value of the terminal's own position relative to the satellite. If the first minimum elevation angle value is less than or equal to the first minimum elevation angle threshold, the terminal may have difficulty in obtaining satisfactory communication quality in the serving cell. Therefore, at this time, the terminal can determine the measurement information of the satellite cell.

[0185] The present disclosure provides a cell switching method, such as Figure 3 As shown, the method is applied to a terminal, comprising:

[0186] Step S201: Determine measurement information of the satellite cell based on relative position information between the terminal and the satellite and reference signal quality information; wherein the reference signal quality information includes: reference signal quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0187] In some embodiments, the terminal may report the determined relative position information between the terminal and the satellite to the base station.

[0188] Here, the relative position information between the terminal and the satellite may include: relative distance, relative distance between the terminal and the center of the satellite cell covered by the satellite, and the minimum elevation angle value at which the terminal can receive satellite signals within the coverage of the satellite. The relative position information between the terminal and the satellite reflects the location of the terminal and the ability to receive satellite cell signals within the coverage of the satellite.

[0189] The reference signal quality information is the quality of the received and sent signals in the service cell where the terminal is located. Reference signals include uplink reference signals and downlink reference signals, which are used for uplink / downlink channel estimation and channel quality measurement. Reference signal quality information may include: RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality) and RS-SINR (ReferenceSignal based Signal to Noise and Interference Ratio). Through the reference signal quality information, the terminal can know its own signal quality in the service cell. If it is determined that the signal quality of the current service cell is poor based on the reference signal quality information, the terminal can perform cell switching.

[0190] In the embodiment of the present disclosure, the terminal may report the measurement information of the cell according to the above relative position information and / or reference signal quality information.

[0191] In some embodiments, the terminal may also report a cell switching request when the relative position information meets the switching condition and / or the reference signal quality information meets the switching condition, and then switch to a candidate target cell that meets the requirements.

[0192] In this way, the terminal measures the communication status between itself and the satellite or in the serving cell and the candidate target cell from multiple aspects, and then performs CHO switching, which enhances the performance of CHO switching compared to the method of only considering the reference signal quality as the switching condition.

[0193] The present disclosure provides a method for cell switching, which is applied to a terminal and includes:

[0194] In response to a first distance of the terminal's position relative to the center position of the serving cell being greater than or equal to a second distance threshold, and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold, determining measurement information of the satellite cell;

[0195] and / or

[0196] In response to the first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell being less than or equal to the first minimum elevation angle threshold, and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold, the measurement information of the satellite cell is determined.

[0197] Here, the service cell is a cell that provides communication services for the terminal. The location of the terminal can be the geographical location of the terminal, or the location of the terminal relative to a predetermined reference object, such as the location of the terminal relative to the service cell base station. If the above-mentioned first distance is greater than or equal to the second distance threshold, the terminal may be at the edge of the service cell or at a location with poor signal quality. At this time, if the reference quality information of the candidate target cell is greater than or equal to the preset first quality threshold, the terminal may be able to obtain communication services that meet the needs in the candidate target cell. Therefore, at this time, the terminal can report the measurement information of the satellite cell to further determine whether cell switching can be performed.

[0198] In addition, the first minimum elevation angle value of the terminal is the minimum elevation angle value of the terminal measuring its own position relative to the satellite. If the first minimum elevation angle value is less than or equal to the first minimum elevation angle threshold, the terminal may have difficulty in obtaining satisfactory communication quality in the service cell. At this time, if the reference quality information of the candidate target cell is greater than or equal to the preset first quality threshold, the terminal may be able to obtain satisfactory communication services in the candidate target cell. Therefore, at this time, the terminal can optionally report the measurement information of the satellite cell so that the network side device (such as a base station) can further determine whether the cell switching can be performed.

[0199] In one embodiment, the terminal may also report a cell switching request based on the relative location information and / or the reference signal quality information. That is, when the relative location information and / or the reference signal quality information meets a predetermined switching condition, a CHO switching of the cell may be requested.

[0200] Through the technical solution of the embodiment of the present disclosure, the terminal uses the distance from the center position of the serving cell and the minimum elevation angle value combined with the reference signal quality information to report the measurement information of the satellite cell, so as to further perform CHO switching. Compared with the method of only considering the reference signal quality information, the switching performance is improved.

[0201] The present disclosure provides a method for cell switching, which is applied to a terminal and includes:

[0202] In response to a second distance of the terminal's position relative to a center position of at least one candidate target cell being less than or equal to a third distance threshold, and the reference signal quality information of the serving cell being less than a preset second quality threshold, determining measurement information of the satellite cell;

[0203] and / or

[0204] In response to the second minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the at least one candidate target cell being greater than or equal to the second minimum elevation angle threshold, and the reference signal quality information of the serving cell being less than a preset second quality threshold, the measurement information of the satellite cell is determined.

[0205] In some embodiments, the terminal may report the determined relative position information between the terminal and the satellite to the base station.

[0206] Here, the service cell is a cell that provides communication services for the terminal, and the location of the terminal can be the geographical location of the terminal, or the location of the terminal relative to a predetermined reference object, such as the location of the terminal relative to the service cell base station. If the above-mentioned second distance is less than or equal to the third distance threshold, the terminal may be located within the range that can be covered by the candidate target cell. At this time, if the reference signal quality information of the service cell is greater than or equal to the preset second quality threshold, the terminal may have difficulty in obtaining communication services that meet the needs in the service cell. Therefore, at this time, the terminal can optionally report the measurement information of the satellite cell so that the network side device (such as a base station) can further determine whether the cell switching can be performed.

[0207] In addition, the second minimum elevation angle value of the terminal is the minimum elevation angle value measured by the terminal at its own location relative to the satellite corresponding to the candidate target cell. If the second minimum elevation angle value is less than or equal to the second minimum elevation angle threshold, the terminal may be able to obtain the communication service that meets the needs provided by the candidate target cell at its location. At this time, if the reference quality information of the serving cell is less than or equal to the preset second quality threshold, the terminal may have difficulty in obtaining the communication service that meets the needs in the serving cell. Therefore, at this time, the terminal can optionally report the measurement information of the satellite cell so that the network side device (such as a base station) can further determine whether the cell switching can be performed.

[0208] In one embodiment, the terminal may also report a cell switching request based on the relative location information and the reference signal quality information. That is, when the relative location information and / or the reference signal quality information meets a predetermined switching condition, a CHO switching of the cell may be requested.

[0209] Through the technical solution of the embodiment of the present disclosure, the terminal uses the distance from the center position of the serving cell and the minimum elevation angle value combined with the reference signal quality information to report the measurement information of the satellite cell, so as to further perform CHO switching. Compared with the method of only considering the reference signal quality information, the switching performance is improved.

[0210] The present disclosure provides a cell switching method, such as Figure 4 As shown, the method is applied to a terminal, comprising:

[0211] Step S301: Receive configuration information of a candidate target cell sent by a base station; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for CHO of the terminal.

[0212] In an embodiment of the present disclosure, a terminal receives configuration information of a candidate target cell sent by a base station. The configuration information may be used to configure one or more candidate target cells. The candidate target cell may be a neighboring cell of a serving cell where the terminal is located.

[0213] After the terminal obtains the configuration information, it can determine whether the switching conditions for CHO are met at any time during the communication process according to its own position, the relative position relationship of the satellite and / or the reference signal quality information through the technical solution of the embodiment of the present disclosure. If the switching conditions are met, it can be switched to the candidate target cell that meets the conditions based on the configuration information.

[0214] When the terminal is within the range of the serving cell, the configuration information of the candidate target cell can be acquired in advance, so as to quickly switch to the candidate target cell when the CHO switching condition is met.

[0215] In some embodiments, the measurement information of the satellite cell includes: a handover request requesting handover to the candidate target cell.

[0216] In an embodiment of the present disclosure, the terminal reports the measurement information of the satellite cell to the base station. If the CHO switching condition is met at this time, for example: the relative position information between the terminal and the satellite meets the predetermined switching condition, and / or the reference signal quality information meets the predetermined switching condition, then the terminal can carry the switching request in the signaling of the measurement information and report it to the base station.

[0217] Of course, the terminal may also report the measurement information and the above-mentioned switching request through different signalings respectively.

[0218] The present disclosure provides a cell switching method, such as Figure 5 As shown, the method is applied to a terminal, comprising:

[0219] Step S401: receiving configuration information of measurement parameters sent by a base station;

[0220] Step S402: Determine relative position information between the terminal and the satellite according to the configuration information of the measurement parameters.

[0221] The terminal can determine the switching conditions for CHO or the measurement content of the reported measurement information under the configuration of the base station. Therefore, the terminal can receive the configuration information of the measurement parameters sent by the base station. The configuration information of the measurement parameters may include the parameter types that the terminal needs to measure, and may also include the threshold range corresponding to each parameter type. The terminal can further determine whether to request CHO switching based on whether each parameter meets the threshold range.

[0222] In the disclosed embodiment, the terminal can determine the relative position relationship between the terminal and the satellite based on the configuration information of the measurement parameters. The relative position relationship reflects the possible relationship between the terminal location and the communication quality of the satellite cell. Therefore, the terminal can further determine whether to perform CHO switching based on the relative position relationship.

[0223] Compared with the method in which the terminal only considers the reference signal quality information as the CHO switching condition, multiple parameters such as the location of the terminal can be combined to improve the reliability of the switching.

[0224] In some embodiments, Figure 6 As shown, the method also includes:

[0225] Step S501, receiving PVT broadcasted by satellite;

[0226] Step S502: Determine the relative position information between the terminal and the satellite according to the PVT.

[0227] PVT contains the satellite's position information, speed information, and time information. Since the satellite is rotating around the earth, the satellite's coverage will change over time. Therefore, the terminal can determine the position relationship between the satellite and the terminal itself through the PVT broadcast by the satellite, which facilitates the judgment of the CHO switching conditions.

[0228] like Figure 7 As shown, an embodiment of the present disclosure provides a cell switching method, which is applied to a base station and includes:

[0229] Step S601: Receive measurement information of a satellite cell reported by a terminal based on relative position information between the terminal and a satellite.

[0230] In the disclosed embodiment, the relative position information between the terminal and the satellite may include: relative distance, relative distance between the terminal and the center of the satellite cell covered by the satellite, and minimum elevation angle value at which the terminal can receive satellite signals within the satellite coverage area.

[0231] The above measurement information may include one or more relative position information, or may be data calculated or processed based on the relative position information. For example, based on the relative position information between the terminal and the satellite, the measured position relationship such as the signal strength and signal quality of the satellite cell and the coverage range of the cell and the distance between the terminal and the satellite.

[0232] The base station can determine whether the terminal meets the conditions for cell switching based on the measurement information of the satellite cell reported by the terminal, and then perform CHO. Alternatively, the base station can determine that the communication status between the cell where the terminal is currently located and the terminal is good based on the measurement information of the satellite cell reported by the terminal, so there is no need to perform CHO.

[0233] Compared with CHO which only supports switching based on reference signal quality, the disclosed embodiment takes into account the relative position relationship between the terminal and the satellite. The base station receives the measurement information reported by the satellite cell based on the relative position information of the terminal, and has more options for CHO switching conditions, thereby enhancing the CHO switching method and improving the switching performance in the NTN system.

[0234] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0235] A first distance between the position of the terminal and the center position of the serving cell;

[0236] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0237] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0238] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0239] In the embodiment of the present disclosure, the satellite cell may include one cell or multiple cells within the coverage of a single satellite, and may also include one cell or multiple cells respectively covered within the coverage of multiple satellites.

[0240] The one or more cells may include a serving cell where the terminal is located, which establishes a communication connection with the terminal and provides communication services for the terminal. If the communication quality of the terminal in the serving cell is poor or the communication quality of the neighboring cell is good, the terminal can switch to the neighboring cell by cell reselection, redirection or cell switching.

[0241] Here, the candidate target cell may include one or more neighboring cells of the serving cell where the terminal is located. Therefore, the terminal may switch to the candidate target cell when performing the above-mentioned cell reselection, redirection or cell switching.

[0242] In the disclosed embodiment, the candidate target cell may be a cell pre-selected or determined by the base station according to the serving cell where the terminal is currently located, and the candidate target cell is sent to the terminal by a configuration method. In this way, the terminal can switch to the candidate target cell when the cell switching condition is met.

[0243] In the disclosed embodiment, the relative position information between the terminal and the satellite may include the relative position relationship between the terminal and the satellite, or the relative position relationship between the terminal and the above-mentioned service cell or candidate target cell covered by the satellite, including: distance, angle, direction, etc.

[0244] Exemplarily, the relative position information between the terminal and the satellite may include a first distance between the terminal's position and the center position of the serving cell. Here, the terminal's position may be a geographical location obtained by the terminal through positioning. The serving cell is a cell where the terminal is located and provides communication services for the terminal. The center position of the serving cell may be the location of a serving base station of the serving cell, or the geometric center of the geographical range covered by the serving cell, or the center position specified by the serving cell.

[0245] The above relative position information may also include a second distance between the terminal's position and the center position of at least one candidate target cell. The at least one candidate target cell may be a candidate cell that the terminal can switch to and that is pre-configured by the base station, and may include one or more neighboring cells of the serving cell. Similar to the serving cell, the center position of the candidate target cell is the location of the base station of the candidate target cell, the geometric center, or the center position specified by the candidate target cell itself. The second distance is the distance between the terminal's geographical location and the center position of the candidate target cell.

[0246] It can be understood that the smaller the above-mentioned first distance is, the higher the possibility that the terminal has good communication quality in the serving cell; the smaller the second distance is, the higher the possibility that the terminal has good communication quality after switching to the candidate target cell. Therefore, if the first distance is greater than the predetermined first threshold, and the second distance is less than the predetermined second threshold, the base station can switch the terminal to the candidate target cell according to the acquired measurement information to obtain better communication quality. On the contrary, if the first distance is less than the predetermined first threshold, and the second distance is greater than the predetermined second threshold, the communication quality obtained by the terminal after switching to the candidate target cell may deteriorate, so there is no need to switch. In addition, if the above-mentioned first distance is greater than the first threshold, and the second distance is greater than the second threshold, the terminal may find it difficult to obtain good communication quality in both cells; or, if the first distance is less than the first threshold, and the second distance is less than the second threshold, the terminal may be able to obtain good communication quality in both cells. At this time, the base station can also determine the switching cell or position unchanged according to other conditions, or it can default not to switch.

[0247] In addition, the above relative position information may also include: the first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the service cell. Since the satellite revolves around the earth, the coverage range of the satellite is affected by the shape of the earth. The angle between the line between a certain ground position and the satellite and the horizon is the elevation angle from the position to the satellite. The first minimum elevation angle value is the minimum elevation angle value of the range in which the terminal can receive the satellite signal corresponding to the service cell. When the elevation angle value from the terminal to the satellite is less than the first minimum elevation angle value, the satellite signal cannot be received. Therefore, the elevation angle value of the actual position of the terminal needs to be greater than the first minimum elevation angle value, otherwise it is necessary to switch cells.

[0248] Here, the relative position information may also include the second minimum elevation angle value. If the elevation angle value of the actual position of the terminal is greater than the second minimum elevation angle value, the terminal can receive the satellite signal corresponding to the candidate target cell. Therefore, if the communication quality of the terminal in the serving cell is poor, the terminal can be switched to the candidate target cell. On the contrary, if the elevation angle value of the actual position of the terminal is less than the second minimum elevation angle value, the terminal cannot be switched to the candidate target cell.

[0249] The present disclosure provides a method for cell switching, which is applied to a base station and includes:

[0250] receiving measurement information of a satellite cell reported by the terminal in response to the first distance being greater than or equal to a first distance threshold;

[0251] and / or

[0252] Receive measurement information of a satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold.

[0253] Here, the service cell is a cell that provides communication services for the terminal, and the location of the terminal can be the geographical location of the terminal, or the location of the terminal relative to a predetermined reference object, such as the location of the terminal relative to the service cell base station. If the above-mentioned first distance is greater than or equal to the first distance threshold, it is possible that the terminal is already at the edge of the service cell or at a location with poor signal quality. Therefore, the base station receives the measurement information of the satellite cell reported by the terminal, which can facilitate further determination of whether the cell switching can be performed.

[0254] Here, the first minimum elevation angle value of the terminal is the minimum elevation angle value of the terminal measuring its own position relative to the satellite. If the first minimum elevation angle value is less than the first minimum elevation angle threshold, the terminal may have difficulty in obtaining satisfactory communication quality in the serving cell. Therefore, the base station receives the measurement information of the satellite cell reported by the terminal, which can facilitate further determination of whether the cell switching can be performed.

[0255] The present disclosure provides a method for cell switching. Figure 8 As shown, the method is applied to a base station, comprising:

[0256] Step S701, receiving measurement information of the satellite cell reported by the terminal; wherein the measurement information of the satellite cell is determined by the terminal based on the relative position information between the terminal and the satellite and / or the reference signal quality information; the reference signal quality information includes: reference quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0257] The reference signal quality information is the quality of the received and sent signals in the service cell where the terminal is located. The reference signal includes an uplink reference signal and a downlink reference signal, which are used for uplink / downlink channel estimation and channel quality measurement. The reference signal quality information may include: RSRP, RSRQ, and RS-SINR. Through the reference signal quality information, the terminal can know its signal quality in the service cell. If it is determined based on the reference signal quality information that the signal quality of the current service cell is poor, the base station can perform cell switching for the terminal.

[0258] In this way, the base station can measure the communication status between itself and the satellite or in the service cell and the candidate target cell from multiple aspects through the terminal, and then perform CHO switching, which enhances the performance of CHO switching compared to the method of only considering the reference signal quality as the switching condition.

[0259] The present disclosure provides a method for cell switching, which is applied to a base station and includes:

[0260] Receiving measurement information of a satellite cell reported by the terminal in response to the first distance being reported to be greater than or equal to a second distance threshold and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold;

[0261] and / or

[0262] The measurement information of the satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold is received.

[0263] Here, the service cell is a cell that provides communication services for the terminal. The location of the terminal can be the geographical location of the terminal, or the location of the terminal relative to a predetermined reference object, such as the location of the terminal relative to the service cell base station. If the above-mentioned first distance is greater than or equal to the second distance threshold, the terminal may be at the edge of the service cell or at a location with poor signal quality. At this time, if the reference quality information of the candidate target cell is greater than or equal to the preset first quality threshold, the terminal may be able to obtain communication services that meet the needs in the candidate target cell. Therefore, the base station receives the measurement information of the satellite cell reported by the terminal, which can facilitate further determination of whether cell switching can be performed.

[0264] In addition, the first minimum elevation angle value of the terminal is the minimum elevation angle value of the terminal measuring its own position relative to the satellite. If the first minimum elevation angle value is less than or equal to the first minimum elevation angle threshold, the terminal may have difficulty in obtaining satisfactory communication quality in the service cell. At this time, if the reference quality information of the candidate target cell is greater than or equal to the preset first quality threshold, the terminal may be able to obtain satisfactory communication services in the candidate target cell. Therefore, the base station receives the measurement information of the satellite cell reported by the terminal, which can facilitate further determination of whether cell switching can be performed.

[0265] Through the technical solution of the embodiment of the present disclosure, the base station can use the distance from the center position of the serving cell and the minimum elevation angle value combined with the measurement information of the satellite cell reported by the terminal using the reference signal quality information, thereby facilitating further CHO switching. Compared with the method of only considering the reference signal quality information, the switching performance is improved.

[0266] The present disclosure provides a method for cell switching, which is applied to a base station and includes:

[0267] receiving measurement information of a satellite cell reported by the terminal in response to the second distance being less than or equal to a third distance threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold;

[0268] and / or

[0269] The measurement information of the satellite cell reported by the terminal in response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than a preset second quality threshold is received.

[0270] Here, the service cell is a cell that provides communication services for the terminal. The location of the terminal can be the geographical location of the terminal, or the location of the terminal relative to a predetermined reference object, such as the location of the terminal relative to the service cell base station. If the above-mentioned second distance is less than or equal to the third distance threshold, the terminal may be located within the range that can be covered by the candidate target cell. At this time, if the reference signal quality information of the service cell is greater than the preset second quality threshold, the terminal may have difficulty in obtaining communication services that meet the needs in the service cell. Therefore, the base station receives the measurement information of the satellite cell reported by the terminal, which can facilitate further determination of whether cell switching can be performed.

[0271] In addition, the second minimum elevation angle value of the terminal is the minimum elevation angle value measured by the terminal at its own location relative to the satellite corresponding to the candidate target cell. If the second minimum elevation angle value is less than or equal to the second minimum elevation angle threshold, the terminal may be able to obtain the communication service that meets the needs provided by the candidate target cell at its location. At this time, if the reference quality information of the serving cell is less than or equal to the preset second quality threshold, the terminal may have difficulty in obtaining the communication service that meets the needs in the serving cell. Therefore, the base station receives the measurement information of the satellite cell reported by the terminal, which can facilitate further determination of whether cell switching can be performed.

[0272] Through the technical solution of the embodiment of the present disclosure, the terminal uses the distance from the center position of the serving cell and the minimum elevation angle value combined with the reference signal quality information to report the measurement information of the satellite cell, so as to further perform CHO switching. Compared with the method of only considering the reference signal quality information, the switching performance is improved.

[0273] The present disclosure provides a method for cell switching, which is applied to a base station and includes:

[0274] Sending configuration information of candidate target cells; wherein the configuration information of the candidate target cells is used to configure the candidate target cells for conditional handover CHO of the terminal.

[0275] In the embodiment of the present disclosure, the configuration information of the candidate target cell sent by the base station to the terminal can be used to configure one or more candidate target cells. The candidate target cell can be a neighboring cell of the serving cell where the terminal is located.

[0276] After the base station sends the configuration information, the terminal can determine whether the switching conditions for CHO are met at any time during the communication process based on its own position, relative position relationship with the satellite and / or reference signal quality information. If the switching conditions are met, it can switch to the candidate target cell that meets the conditions based on the configuration information.

[0277] Through the technical solution of the embodiments of the present disclosure, the base station can pre-send the configuration information of the candidate target cell when the terminal is within the range of the serving cell, so that the terminal can quickly switch to the candidate target cell when the CHO switching condition is met.

[0278] The present disclosure provides a cell switching method, which is applied to a base station and includes:

[0279] Based on the coverage of the satellite, configuration information of the measurement parameters is sent down; wherein the configuration information of the measurement parameters is used for the terminal to determine the relative position information.

[0280] The configuration information of the measurement parameters may include the parameter types that the terminal needs to measure, and may also include the threshold range corresponding to each parameter type. The terminal may further determine whether to request CHO switching based on whether each parameter meets the threshold range.

[0281] The cell switching method and system provided by the embodiments of the present disclosure can effectively solve the problem of triggering measurement reporting and performing cell switching in the NTN system by introducing a decision method based on a location threshold or a received signal elevation angle threshold and jointly measuring the quality of a reference signal (RSRNTP / RSRQ / SINR).

[0282] For ease of description, the steps are described in a step-by-step manner, and the actual sequence does not have to be exactly the same as described.

[0283] Step 1: The base station configures candidate target cells for the UE through IE ConditionalReconfiguration signaling;

[0284] Step 2: Introduce location-based measurement reporting events or reception elevation-based measurement reporting events in IE ReportConfigNR signaling;

[0285] Step 3: The terminal UE that supports GNSS positioning obtains the current location information through GNSS positioning, and the satellite sends its PVT information in a broadcasting manner. The terminal UE calculates the distance ΔD=P1-P2 between it and the center of the cell covered by the satellite, where P1 is the current location information of the terminal UE, and P2 is the location information of the satellite received by the UE from the satellite broadcast;

[0286] Step 4: The satellite notifies the UE of the minimum elevation angle (Elevationangle) Ang at which the satellite signal can be received by broadcasting;

[0287] Step 5: The network configures the distance threshold D according to the radius of the cell it covers. Threshold and receiving elevation angle threshold Ang Threshold ;

[0288] Step 6: The UE determines whether it needs to feedback the measurement reporting event by receiving the PVT information or the received elevation angle value of the signal and the quality of the joint measurement reference signal. The UE sends a cell switching request in the following ways in the following scenarios:

[0289] Step 6a: Switching from a cell covered by one satellite to a cell covered by another satellite, when the distance between the UE and the center of the serving cell ΔD ≥ D Threshold And / or the elevation angle value Ang ≤ Ang received by the UE Threshold When the UE sends a cell switching request indication in the reported IE MeasurementReport signaling;

[0290] Step 6b: Switching from a cell covered by a satellite to a cell covered by a ground base station, when the distance between the UE and the center of the serving cell ΔD ≥ D Threshold And / or the elevation angle value Ang ≤ Ang received by the UE Threshold When the RSRP / RSRQ / SINR value measured by the target cell is greater than the configured RSRP / RSRQ / SINR threshold value, the UE feeds back the measurement result of the RSRP / RSRQ / SINR of the target cell in the reported IEMeasurementReport and issues a cell switching request indication;

[0291] Step 6c: Switch from a cell covered by a ground base station to a cell covered by a satellite when the RSRP / RSRQ / SINR value measured by the serving cell is less than the configured RSRP / RSRQ / SINR threshold and the distance between the UE and the center of the target cell is ΔD≤D Threshold And / or the elevation angle value Ang ≥ Ang received by the UE Threshold When , the UE sends a cell switching request indication in the reported IEMeasurementReport;

[0292] Through the technical solution provided by the embodiment of the present disclosure: in the NTN system, by introducing a decision method based on the position threshold or the received signal elevation angle threshold and the quality of the joint measurement reference signal (RSRP / RSRQ / SINR), the measurement report can be triggered and the cell switching can be performed. The cell switching performance in the NTN system can be improved, and the switching failure caused by the inability to accurately trigger the measurement reporting mechanism can be reduced.

[0293] like Fig. 9 As shown, the embodiment of the present disclosure further provides a cell switching device 900, which is applied in a terminal, and includes:

[0294] The first reporting module 901 is configured to determine the measurement information of the satellite cell based on the relative position information between the terminal and the satellite.

[0295] In some embodiments, the terminal may report the determined relative position information between the terminal and the satellite to the base station through the first reporting module 901 .

[0296] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0297] A first distance between the position of the terminal and the center position of the serving cell;

[0298] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0299] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0300] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0301] In some embodiments, the first reporting module includes:

[0302] A first reporting submodule, configured to determine the measurement information of the satellite cell in response to the first distance being greater than or equal to a first distance threshold;

[0303] and / or

[0304] The second reporting submodule is configured to determine the measurement information of the satellite cell in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold.

[0305] Of course, if whether to perform the handover is determined by the network side, the measurement information of the satellite cell may be reported to the network side (eg, a base station).

[0306] In some embodiments, the first reporting module includes:

[0307] The third reporting submodule is configured to report the measurement information of the satellite cell based on the relative position information between the terminal and the satellite and / or the reference signal quality information; wherein the reference signal quality information includes: reference signal quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0308] In some embodiments, the third reporting submodule includes:

[0309] a fourth reporting submodule, configured to report the measurement information of the satellite cell in response to the first distance being greater than or equal to a second distance threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold;

[0310] and / or

[0311] The fifth reporting submodule is configured to report the measurement information of the satellite cell in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold.

[0312] In some embodiments, the third reporting submodule includes:

[0313] a sixth reporting submodule, configured to report the measurement information of the satellite cell in response to the second distance being less than or equal to a third distance threshold, and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold;

[0314] and / or

[0315] The seventh reporting submodule is configured to report the measurement information of the satellite cell in response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold.

[0316] In some embodiments, the apparatus further comprises:

[0317] The first receiving module is configured to receive configuration information of a candidate target cell sent by a base station; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

[0318] In some embodiments, the measurement information of the satellite cell includes: a handover request requesting handover to the candidate target cell.

[0319] In some embodiments, the apparatus further comprises:

[0320] A second receiving module is configured to receive configuration information of measurement parameters sent by the base station;

[0321] The first determination module is configured to determine the relative position information according to the configuration information of the measurement parameters.

[0322] In some embodiments, the apparatus further comprises:

[0323] A third receiving module is configured to receive satellite position, satellite speed and time information PVT broadcasted by a satellite;

[0324] The second determination module is configured to determine the relative position information between the terminal and the satellite according to the PVT.

[0325] like Fig.10 As shown, the embodiment of the present disclosure further provides a cell switching device 1000, which is applied in a base station, and includes:

[0326] The fourth receiving module 1001 is configured to receive measurement information of a satellite cell reported by a terminal based on relative position information between the terminal and a satellite.

[0327] In some embodiments, the satellite cell includes: a serving cell and / or at least one candidate target cell where the terminal is located; and the relative position information between the terminal and the satellite includes at least one of the following:

[0328] A first distance between the position of the terminal and the center position of the serving cell;

[0329] a second distance between the position of the terminal and the center position of at least one candidate target cell;

[0330] A first minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the serving cell;

[0331] The terminal is capable of receiving a second minimum elevation angle value of a satellite signal corresponding to the at least one candidate target cell.

[0332] In some embodiments, the fourth receiving module includes:

[0333] A first receiving submodule, configured to receive measurement information of a satellite cell reported by the terminal in response to the first distance being greater than or equal to a first distance threshold;

[0334] and / or

[0335] The second receiving submodule is configured to receive measurement information of a satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold.

[0336] In some embodiments, the fourth receiving module includes:

[0337] The third receiving submodule is configured to receive measurement information of the satellite cell reported by the terminal based on the relative position information between the terminal and the satellite and / or reference signal quality information; wherein the reference signal quality information includes: reference quality information of at least one candidate target cell and / or reference signal quality information of the serving cell.

[0338] In some embodiments, the third receiving submodule includes:

[0339] a fourth receiving submodule, configured to receive measurement information of a satellite cell reported by the terminal in response to the first distance being reported to be greater than or equal to a second distance threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold;

[0340] and / or

[0341] The fifth receiving submodule is configured to receive measurement information of the satellite cell reported by the terminal in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold.

[0342] In some embodiments, the third receiving submodule includes:

[0343] a sixth receiving submodule, configured to receive measurement information of a satellite cell reported by the terminal in response to the second distance being less than or equal to a third distance threshold, and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold;

[0344] and / or

[0345] The seventh receiving submodule is configured to receive the measurement information of the satellite cell reported by the terminal in response to the second minimum elevation angle value being greater than or equal to the second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than or equal to the preset second quality threshold.

[0346] In some embodiments, the apparatus further comprises:

[0347] The first sending module is configured to send configuration information of a candidate target cell; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

[0348] In some embodiments, the apparatus further comprises:

[0349] The second sending module is configured to send configuration information of measurement parameters based on the coverage of the satellite; wherein the configuration information of the measurement parameters is used for the terminal to determine the relative position information.

[0350] Regarding the device in the above embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0351] Fig.111 is a block diagram of a communication device provided by an embodiment of the present disclosure. The communication device may be a terminal. For example, the communication device 1100 may be a mobile phone, a computer, a digital broadcast user device, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0352] Reference Fig.11 , the communication device 1100 may include at least one of the following components: a processing component 1102 , a memory 1104 , a power component 1106 , a multimedia component 1108 , an audio component 1110 , an input / output (I / O) interface 1112 , a sensor component 1114 , and a communication component 1116 .

[0353] The processing component 1102 generally controls the overall operation of the communication device 1100, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 1102 may include at least one processor 1120 to execute instructions to complete all or part of the steps of the above-mentioned method. In addition, the processing component 1102 may include at least one module to facilitate the interaction between the processing component 1102 and other components. For example, the processing component 1102 may include a multimedia module to facilitate the interaction between the multimedia component 1108 and the processing component 1102.

[0354] The memory 1104 is configured to store various types of data to support the operation of the communication device 1100. Examples of such data include instructions for any application or method operating on the communication device 1100, contact data, phone book data, messages, pictures, videos, etc. The memory 1104 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic disk or optical disk.

[0355] The power supply component 1106 provides power to the various components of the communication device 1100. The power supply component 1106 can include a power management system, at least one power supply, and other components associated with generating, managing, and distributing power for the communication device 1100.

[0356] The multimedia component 1108 includes a screen that provides an output interface between the communication device 1100 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes at least one touch sensor to sense touch, slide, and gestures on the touch panel. The touch sensor may not only sense the boundaries of the touch or slide action, but also detect the wake-up time and pressure associated with the touch or slide operation. In some embodiments, the multimedia component 1108 includes a front camera and / or a rear camera. When the communication device 1100 is in an operating mode, such as a shooting mode or a video mode, the front camera and / or the rear camera may receive external multimedia data. Each front camera and rear camera may be a fixed optical lens system or have a focal length and optical zoom capability.

[0357] The audio component 1110 is configured to output and / or input audio signals. For example, the audio component 1110 includes a microphone (MIC), and when the communication device 1100 is in an operation mode, such as a call mode, a recording mode, and a speech recognition mode, the microphone is configured to receive an external audio signal. The received audio signal can be further stored in the memory 1104 or sent via the communication component 1116. In some embodiments, the audio component 1110 also includes a speaker for outputting audio signals.

[0358] I / O interface 1112 provides an interface between processing component 1102 and peripheral interface modules, which may be keyboards, click wheels, buttons, etc. These buttons may include but are not limited to: a home button, a volume button, a start button, and a lock button.

[0359] The sensor assembly 1114 includes at least one sensor for providing various aspects of status assessment for the communication device 1100. For example, the sensor assembly 1114 can detect the open / closed state of the device 1100, the relative positioning of components, such as the display and keypad of the communication device 1100, and the sensor assembly 1114 can also detect the position change of the communication device 1100 or a component of the communication device 1100, the presence or absence of user contact with the communication device 1100, the orientation or acceleration / deceleration of the communication device 1100, and the temperature change of the communication device 1100. The sensor assembly 1114 may include a proximity sensor configured to detect the presence of a nearby object without any physical contact. The sensor assembly 1114 may also include an optical sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor assembly 1114 may also include an accelerometer, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

[0360] The communication component 1116 is configured to facilitate wired or wireless communication between the communication device 1100 and other devices. The communication device 1100 can access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In an exemplary embodiment, the communication component 1116 receives a broadcast signal or broadcast-related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communication component 1116 also includes a near field communication (NFC) module to facilitate short-range communication. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

[0361] In an exemplary embodiment, the communication device 1100 may be implemented by at least one application-specific integrated circuit (ASIC), a digital signal processor (DSP), a digital signal processing device (DSPD), a programmable logic device (PLD), a field programmable gate array (FPGA), a controller, a microcontroller, a microprocessor or other electronic component to perform the above method.

[0362] In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions is also provided, such as a memory 1104 including instructions, and the instructions can be executed by the processor 1120 of the communication device 1100 to perform the above method. For example, the non-transitory computer-readable storage medium can be a ROM, a random access memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, etc.

[0363] like Fig.12 As shown, an embodiment of the present disclosure shows the structure of another communication device. The communication device may be a base station involved in an embodiment of the present disclosure. For example, the communication device 1200 may be provided as a network device. Fig.12 The communication device 1200 includes a processing component 1222, which further includes at least one processor, and a memory resource represented by a memory 1232 for storing instructions executable by the processing component 1222, such as an application. The application stored in the memory 1232 may include one or more modules, each corresponding to a set of instructions. In addition, the processing component 1222 is configured to execute instructions to perform any of the methods described above in the communication device.

[0364] The communication device 1200 may also include a power supply component 1226 configured to perform power management of the communication device 1200, a wired or wireless network interface 1250 configured to connect the communication device 1200 to a network, and an input / output (I / O) interface 1258. The communication device 1200 may operate based on an operating system stored in the memory 1232, such as Windows Server TM, Mac OS X TM, Unix TM, Linux TM, FreeBSD TM or the like.

[0365] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0366] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A cell switching method, performed by a terminal, comprising: Receive configuration information of measurement parameters sent by the base station; Determine, according to the configuration information, relative position information between the terminal and the satellite, wherein the position information includes: a first distance and a second distance, the first distance being a distance between the position of the terminal and the position of the serving cell, and the second distance being a distance between the position of the terminal and the position of at least one candidate target cell; In response to the first distance being greater than or equal to a first distance threshold and the second distance being less than or equal to a third distance threshold, determining measurement information of the serving cell and / or the at least one candidate target cell; Reporting the measurement information to a base station, where the measurement information is used by the base station to determine whether to perform conditional handover CHO; The method further comprises: Receive configuration information of a candidate target cell sent by a base station; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

2. The method according to claim 1, wherein: The position of the serving cell is a position associated with the serving cell and used for reference; the position of the candidate target cell is a position associated with the candidate target cell and used for reference.

3. The method according to claim 1 or 2, wherein: The relative position information between the terminal and the satellite also includes one of the following: a first minimum elevation angle and a second minimum elevation angle, wherein the first minimum elevation angle value is the minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the service cell; the second minimum elevation angle value is the minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the at least one candidate cell.

4. The method according to claim 3, wherein: The method further comprises one of the following: In response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold, determining the measurement information; In response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold, and the reference signal quality information of the at least one candidate target cell being greater than or equal to a preset first quality threshold, determining the measurement information; In response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold, and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold, the measurement information is determined.

5. The method according to claim 1, wherein: The measurement information includes: a handover request requesting handover to the candidate target cell.

6. The method according to any one of claims 1 to 4, wherein: The method further comprises: Receive satellite position, satellite speed and time information PVT broadcast by satellite; According to the PVT, relative position information between the terminal and the satellite is determined.

7. A cell switching method, performed by a base station, comprising: Sending configuration information of measurement parameters; wherein the configuration information is used for the terminal to determine the relative position information between the terminal and the satellite; the relative position information includes: a first distance and a second distance, the first distance is the distance between the position of the terminal and the position of the serving cell, and the second distance is the distance between the position of the terminal and the position of at least one candidate target cell; receiving measurement information of the serving cell and / or the at least one candidate target cell reported by the terminal, where the measurement information is determined by the terminal in response to the first distance being greater than or equal to a first distance threshold and the second distance being less than or equal to a third distance threshold, and the measurement information is used by the base station to determine whether to perform conditional handover CHO; The method further comprises: Sending configuration information of candidate target cells; wherein the configuration information of the candidate target cells is used to configure the candidate target cells for conditional handover CHO of the terminal.

8. The method according to claim 7, wherein: The position of the serving cell is a position associated with the serving cell and used for reference; the position of the candidate target cell is a position associated with the candidate target cell and used for reference.

9. The method according to claim 7 or 8, wherein: The relative position information between the terminal and the satellite also includes one of the following: a first minimum elevation angle and a second minimum elevation angle, wherein the first minimum elevation angle value is the minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the service cell; the second minimum elevation angle value is the minimum elevation angle value at which the terminal can receive the satellite signal corresponding to the at least one candidate cell.

10. The method according to claim 9, wherein: The method further comprises one of the following: receiving the measurement information reported by the terminal in response to the first minimum elevation angle value being less than or equal to a first minimum elevation angle threshold; receiving the measurement information reported by the terminal in response to the first minimum elevation angle value being less than or equal to the first minimum elevation angle threshold, and the reference signal quality information of the at least one candidate target cell being greater than a preset first quality threshold; The measurement information reported by the terminal in response to the second minimum elevation angle value being greater than or equal to a second minimum elevation angle threshold and the reference signal quality information of the serving cell being less than or equal to a preset second quality threshold is received.

11. A cell switching device, the device being applied to a terminal, comprising: A second receiving module is configured to receive configuration information of measurement parameters sent by the base station; a first determination module, configured to determine relative position information between the terminal and the satellite according to the configuration information, wherein the relative position information includes: a first distance and a second distance, the first distance being a distance between the position of the terminal and the position of the serving cell, and the second distance being a distance between the position of the terminal and the position of at least one candidate target cell; A first reporting module is configured to determine, in response to the first distance being greater than or equal to a first distance threshold and the second distance being less than or equal to a third distance threshold, measurement information of the serving cell and / or the at least one candidate target cell; and report the measurement information to a base station, where the measurement information is used by the base station to determine whether to perform conditional handover CHO; The first receiving module is configured to receive configuration information of a candidate target cell sent by a base station; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

12. A cell switching device, the device being applied to a base station, comprising: A second sending module is configured to send configuration information of the measurement parameters; wherein the configuration information is used for the terminal to determine the relative position information between the terminal and the satellite; the relative position information includes: a first distance and a second distance, the first distance is the distance between the position of the terminal and the position of the serving cell, and the second distance is the distance between the position of the terminal and the position of at least one candidate target cell; a fourth receiving module, configured to receive measurement information of the serving cell and / or the at least one candidate target cell reported by the terminal, the measurement information being determined by the terminal in response to the first distance being greater than or equal to the first distance threshold and the second distance being less than or equal to the third distance threshold, and the measurement information being used by the base station to determine whether to perform conditional handover CHO; The first sending module is configured to send configuration information of a candidate target cell; wherein the configuration information of the candidate target cell is used to configure the candidate target cell for conditional handover CHO of the terminal.

13. A communication device, the communication device comprising at least: A processor and a memory for storing executable instructions capable of running on the processor, wherein: When the processor is used to run the executable instructions, the executable instructions execute the steps in the cell switching method provided in any one of claims 1 to 6 or 7 to 10.

14. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps in the cell handover method provided in any one of claims 1 to 6 or 7 to 10 are implemented.

15. A computer program product, comprising a computer program, wherein when the computer program is executed by a processor, the steps in the cell handover method provided in any one of claims 1 to 6 or 7 to 10 are implemented.

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