Cell handover method and apparatus

Abstract

The embodiments of the present disclosure relate to the technical field of satellite Internet. Disclosed are a cell handover method and apparatus. The method comprises: on the basis of information of a first position where a spatial terminal is currently located, determining a first three-dimensional cell where the spatial terminal is currently located; on the basis of information of a second position where the spatial terminal is located after a preset time period, and a cell handover strategy, determining a second three-dimensional cell to which the spatial terminal is to be handed over; and sending a handover message to the spatial terminal, so as to instruct the spatial terminal to hand over from the first three-dimensional cell to the second three-dimensional cell. On the basis of dividing a service area of a network device into three-dimensional cells, before a spatial terminal moves out of a first three-dimensional cell where the spatial terminal is currently located, a second three-dimensional cell can be predicted for the spatial terminal in advance, and the spatial terminal is thus handed over to the second three-dimensional cell in a timely manner, so that the service continuity and the communication reliability can be ensured for spatial terminals located at any position in a three-dimensional space such as on the ground, on the sea surface or in the air, thereby improving the service quality.

Description

Cell switching method and device Technical Field

[0001] The present disclosure relates to the field of satellite Internet technology, and in particular to a cell switching method and device. Background Art

[0002] With the development of communication technology, the terminal devices used by users have gradually evolved from handheld terminals, vehicle-mounted terminals, ship-mounted terminals, etc. that move at low speed and in a small range on the ground or sea surface, to terminal forms such as drones and low-Earth orbit aircraft that have the ability to move quickly and over a large range in the air. How to provide high-quality services and ensure communication reliability for terminal devices at any location in space such as on the ground, sea and air has become an urgent problem to be solved.

[0003] Summary of the Invention

[0004] The disclosed embodiments propose a cell switching method and apparatus, which can at least solve the problem in related technologies of how to provide high-quality services and ensure communication reliability for terminal devices at any location in space such as the ground, sea, and air.

[0005] According to the first aspect of an embodiment of the present disclosure, a cell switching method is proposed, which is applied to a first network device, and the method includes: determining the first three-dimensional cell where the space terminal is currently located based on the first position information where the space terminal is currently located; determining the second three-dimensional cell to be switched by the space terminal based on the second position information where the space terminal is located after a preset time period and a cell switching strategy; and sending a switching message to the space terminal to instruct the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell.

[0006] In some embodiments, the method further includes: acquiring the first position information and the motion state information of the space terminal from the space terminal; and acquiring the second position information based on the first position information and the motion state information.

[0007] In some embodiments, the first position information includes a first position coordinate in the earth coordinate system; the second position information includes a second position coordinate in the earth coordinate system; the second position information is obtained by converting the displacement of the space terminal in the inertial coordinate system after the preset time period based on a first conversion matrix from the inertial coordinate system to the earth coordinate system; the displacement is obtained based on the third position coordinate, running speed and three-axis acceleration of the space terminal in the inertial coordinate system; the three-axis acceleration and the running speed are obtained based on the motion state information; the third position coordinate is obtained by converting the first position coordinate by a second conversion matrix from the earth coordinate system to the inertial coordinate system.

[0008] In some embodiments, the first 3D cell and the second 3D cell are located at different altitudes, and the switching message carries codeword information corresponding to the altitude of the second 3D cell, instructing the space terminal to perform cell switching based on the codeword information.

[0009] In some embodiments, the codeword corresponding to the height at which the first 3D cell is located and the codeword corresponding to the height at which the second 3D cell is located are orthogonal or quasi-orthogonal to each other.

[0010] In some embodiments, the first stereo cell and the second stereo cell are covered by different beams, and the switching message carries relevant information of the beam covering the second stereo cell, instructing the space terminal to perform cell switching based on the relevant information of the beam.

[0011] In some embodiments, the method further includes: when the second stereoscopic cell is within the coverage of the second network device, sending a first switching negotiation message to the second network device, wherein the first switching negotiation message carries the identifier of the second stereoscopic cell, instructing the second network device to reserve service resources of the second stereoscopic cell.

[0012] In some embodiments, the method further includes: reserving service resources of the second 3D cell if the second 3D cell is within the coverage of the first network device and the first network device has the capability of providing service resources of the second 3D cell.

[0013] In some embodiments, the method also includes: when the second three-dimensional cell is within the coverage of the first network device and the first network device does not have the ability to provide service resources of the second three-dimensional cell, determining the third three-dimensional cell to be switched by the spatial terminal, wherein the third three-dimensional cell is within the coverage of the third network device; sending a second switching negotiation message to the third network device, wherein the second switching negotiation message carries the identifier of the third three-dimensional cell, instructing the third network device to reserve the service resources of the third three-dimensional cell.

[0014] According to the second aspect of an embodiment of the present disclosure, a cell switching method is proposed, which is applied to a space terminal, and the method includes: receiving a switching message from a network device; switching from a first three-dimensional cell where the space terminal is currently located to a second three-dimensional cell based on the switching message; wherein the first three-dimensional cell is determined by the network device based on the first position information where the space terminal is currently located, and the second three-dimensional cell is determined by the network device based on the second position information where the space terminal is located after a preset time period and a cell switching strategy.

[0015] In some embodiments, the method further includes: sending the first location information to the network device.

[0016] In some embodiments, the method further includes: sending the first location information and the motion status information of the space terminal to the network device, wherein the first location information and the motion status information are used to obtain the second location information.

[0017] In some embodiments, the first three-dimensional cell and the second three-dimensional cell are located at different altitudes, and the switching message carries code information corresponding to the altitude of the second three-dimensional cell; switching from the first three-dimensional cell where the space terminal is currently located to the second three-dimensional cell based on the switching message includes: switching from the first three-dimensional cell to the second three-dimensional cell based on the code information.

[0018] In some embodiments, the first stereo cell and the second stereo cell are covered by different beams, and the switching message carries relevant information of the beam covering the second stereo cell; switching from the first stereo cell where the space terminal is currently located to the second stereo cell based on the switching message includes: switching from the first stereo cell to the second stereo cell based on the relevant information of the beam.

[0019] According to the third aspect of an embodiment of the present disclosure, a cell switching device is proposed, wherein the device is applied to a first network device, and the device includes: a processing module for determining the first three-dimensional cell where the space terminal is currently located based on the first position information where the space terminal is currently located, and determining the second three-dimensional cell to be switched by the space terminal based on the second position information where the space terminal is located after a preset time period and a cell switching strategy; a transceiver module for sending a switching message to the space terminal, instructing the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell.

[0020] According to the fourth aspect of an embodiment of the present disclosure, a cell switching device is proposed, wherein the device is applied to a space terminal, and the device includes: a transceiver module for receiving a switching message from a network device; a processing module for switching from a first three-dimensional cell where the space terminal is currently located to a second three-dimensional cell based on the switching message; wherein the first three-dimensional cell is determined by the network device based on the first position information where the space terminal is currently located, and the second three-dimensional cell is determined by the network device based on the second position information where the space terminal is located after a preset time period and a cell switching strategy.

[0021] According to a fifth aspect of an embodiment of the present disclosure, a network device is proposed, comprising: one or more processors; one or more memories for storing instructions; wherein the processor is used to call the instructions so that the network device executes the cell switching method described in the first aspect and the optional implementation method of the first aspect.

[0022] According to the sixth aspect of an embodiment of the present disclosure, a space terminal is proposed, comprising: one or more processors; one or more memories for storing instructions; wherein the processor is used to call the instructions so that the space terminal executes the cell switching method described in the second aspect and the optional implementation method of the second aspect.

[0023] According to the seventh aspect of an embodiment of the present disclosure, a communication system is proposed, comprising a network device and a space terminal; wherein the network device is configured to implement the method described in the first aspect or the optional implementation manner of the first aspect, and the space terminal is configured to implement the method described in the second aspect or the optional implementation manner of the second aspect.

[0024] According to the eighth aspect of an embodiment of the present disclosure, a storage medium is proposed, which stores instructions. When the instructions are executed on a communication device, the communication device executes the method described in the first aspect or the second aspect, the optional implementation of the first aspect, or the optional implementation of the second aspect.

[0025] According to the ninth aspect of the embodiment of the present disclosure, a program product is proposed. When the program product is executed by a communication device, the communication device executes the method described in the first aspect or the second aspect, the optional implementation of the first aspect or the optional implementation of the second aspect.

[0026] According to the tenth aspect of the embodiments of the present disclosure, a computer program is proposed, which, when running on a computer, enables the computer to execute the method described in the first aspect or the second aspect, the optional implementation of the first aspect, or the optional implementation of the second aspect.

[0027] The solution proposed in the embodiment of the present disclosure is to divide the service area of ​​the network device into three-dimensional stereoscopic cells, determine the first stereoscopic cell where the space terminal is currently located according to the first position information where the space terminal is currently located, determine the second stereoscopic cell to be switched by the space terminal according to the second position information where the space terminal is located after a preset time period and the cell switching strategy, send a switching message to the space terminal, instructing the space terminal to switch from the first stereoscopic cell to the second stereoscopic cell, so that the second stereoscopic cell to be switched can be predicted for the space terminal in advance before the space terminal moves out of the first stereoscopic cell where it is currently located, thereby enabling the space terminal to switch to the second stereoscopic cell in a timely manner, thereby ensuring the continuity of service and the reliability of communication for the space terminal at any position in the three-dimensional space such as on the ground, on the sea or in the air, and improving the service quality. In addition, by predicting the second stereoscopic cell to be switched based on the second position information where the space terminal is located after a preset time period by the first network device, the space terminal can avoid sending a measurement report to the first network device, reducing the time delay and improving the accuracy of the determined second stereoscopic cell. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or the background technology, the drawings required for use in the embodiments of the present disclosure or the background technology will be described below.

[0029] FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure;

[0030] FIG2 is a schematic diagram of a flow chart of a cell switching method according to an embodiment of the present disclosure;

[0031] FIG3 is a schematic diagram showing a three-dimensional cell division method according to an embodiment of the present disclosure;

[0032] FIG4 is a schematic flow chart of a cell switching method according to an embodiment of the present disclosure;

[0033] FIG5 is a schematic diagram of a flow chart of a cell switching method according to an embodiment of the present disclosure;

[0034] FIG6 is a schematic diagram of a flow chart of a cell switching method according to an embodiment of the present disclosure;

[0035] FIG7 is a schematic diagram of a flow chart of a cell switching method according to an embodiment of the present disclosure;

[0036] FIG8 is a schematic structural diagram of a cell switching device proposed in an embodiment of the present disclosure;

[0037] FIG9 is a schematic structural diagram of a cell switching device proposed in an embodiment of the present disclosure;

[0038] FIG10 is a schematic structural diagram of a communication device proposed in an embodiment of the present disclosure;

[0039] FIG11 is a schematic diagram of the structure of a chip proposed in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0040] With the advancement of communication technology, the terminal devices used by users have gradually evolved from handheld terminals, vehicle-mounted terminals, and ship-mounted terminals that move slowly and within a small range on the ground or at sea, to terminals capable of rapid and large-scale aerial movement, such as drones and low-Earth orbiting vehicles. In the embodiments of this disclosure, terminal devices located anywhere in three-dimensional space, such as on the ground, at sea, or in the air, are collectively referred to as space terminals.

[0041] Related technologies usually divide the service area of ​​network equipment into flat cells on the surface to provide services for terminal devices. However, as the terminal devices used by users gradually evolve into space terminals located at any position in three-dimensional space such as on the ground, sea or in the air, how to provide high-quality services for space terminals and ensure communication reliability has become an urgent problem to be solved.

[0042] The embodiments of the present disclosure propose a cell switching method, a cell switching device, a network device, a space terminal, a communication system, a storage medium, a program product, and a computer program. By dividing the service area of ​​the network device into three-dimensional stereoscopic cells, determining the first stereoscopic cell where the space terminal is currently located based on the first position information where the space terminal is currently located, determining the second stereoscopic cell to be switched by the space terminal based on the second position information where the space terminal is located after a preset time period and the cell switching strategy, sending a switching message to the space terminal to instruct the space terminal to switch from the first stereoscopic cell to the second stereoscopic cell, it is possible to achieve the second stereoscopic cell to be switched to be predicted for the space terminal in advance before the space terminal moves out of the first stereoscopic cell where it is currently located, thereby enabling the space terminal to switch to the second stereoscopic cell in a timely manner, thereby ensuring service continuity and communication reliability for the space terminal at any position in a three-dimensional space such as on the ground, on the sea or in the air, and improving service quality. In addition, by predicting the second stereoscopic cell to be switched based on the second position information where the space terminal is located after a preset time period by the first network device, it is possible to avoid the space terminal sending a measurement report to the first network device, reducing time delay and improving the accuracy of the determined second stereoscopic cell.

[0043] In addition, the cell switching method proposed in the embodiment of the present disclosure can be applied to satellite communication systems. It is aimed at multi-satellite operation and resource sharing scenarios of different constellation systems. Based on the beam coverage characteristics of each satellite in each satellite system, a three-dimensional cell with global unified addressing is established to enable space terminals to switch between different constellation systems, different satellites, and different beams, thereby ensuring the continuity of satellite communication services and the reliability of communications.

[0044] In order to better understand the cell switching method disclosed in the embodiment of the present disclosure, the communication system to which the embodiment of the present disclosure is applicable is first described below.

[0045] FIG1 is a schematic diagram of the architecture of a communication system according to an embodiment of the present disclosure, wherein FIG1 takes a satellite communication system as an example and a satellite as a network device as an example.

[0046] As shown in FIG1 , the satellite communication system may include but is not limited to a network device 101 and a space terminal 102 .

[0047] In some embodiments, the network device 101 is, for example, a node or device that connects a terminal device to a wireless network. The network device may include at least one of a satellite, an evolved NodeB (eNB), a next generation evolved NodeB (ng-eNB), a next generation NodeB (gNB), a NodeB (NB), a home nodeB (HNB), a home evolved nodeB (HeNB), a wireless backhaul device, a radio network controller (RNC), a base station controller (BSC), a base transceiver station (BTS), a base band unit (BBU), a mobile switching center, a base station in a 6G communication system, an open RAN, a cloud RAN, a base station in other communication systems, and an access node in a Wi-Fi system, but is not limited thereto. The satellite may be a high-orbit satellite, a ground-orbit satellite, or a medium-orbit satellite.

[0048] In some embodiments, the space terminal 102 is a terminal device located at any position in a three-dimensional space such as on the ground, sea or air, for example, including handheld terminal devices such as mobile phones, vehicle-mounted terminal devices such as vehicle controllers, ship-mounted terminal devices, wearable devices, Internet of Things devices, cars with communication functions, smart cars, aircraft, tablet computers, computers with wireless transceiver functions, virtual reality (VR) terminal devices, augmented reality (AR) terminal devices, wireless terminal devices in industrial control, wireless terminal devices in self-driving, wireless terminal devices in remote medical surgery, wireless terminal devices in smart grids, wireless terminal devices in transportation safety, wireless terminal devices in smart cities, and at least one of wireless terminal devices in smart homes, but not limited to these.

[0049] It can be understood that the communication system described in the embodiment of the present disclosure is for the purpose of more clearly illustrating the technical solution of the embodiment of the present disclosure, and does not constitute a limitation on the technical solution proposed in the embodiment of the present disclosure. A person skilled in the art can know that with the evolution of the system architecture and the emergence of new business scenarios, the technical solution proposed in the embodiment of the present disclosure is also applicable to similar technical problems.

[0050] The following embodiments of the present disclosure may be applied to the communication system shown in Figure 1 or some of the entities therein, but are not limited thereto. The entities shown in Figure 1 are examples. The communication system may include all or some of the entities shown in Figure 1, or may include other entities outside of Figure 1. The number and form of the entities are arbitrary, and the entities may be physical or virtual. The connection relationship between the entities is an example. The entities may be connected or disconnected, and the connection may be in any manner, whether direct or indirect, and wired or wireless.

[0051] The cell switching method proposed in the embodiment of the present disclosure is described in detail below.

[0052] First, the cell switching method applied to the first network device proposed in the embodiment of the present disclosure is described. The first network device is a network device currently providing services to the space terminal.

[0053] Figure 2 is a flow chart of a cell handover method according to an embodiment of the present disclosure. As shown in Figure 2, the method according to the embodiment of the present disclosure includes the following steps 201-203.

[0054] Step 201: Determine a first three-dimensional cell where the space terminal is currently located according to first location information where the space terminal is currently located.

[0055] Among them, the first location information is the information of the first location of the space terminal at the current moment, which may include longitude information, latitude information, altitude information, etc.

[0056] In some embodiments, the first location information can be obtained by the space terminal and sent to the first network device.

[0057] In some embodiments, a navigation receiver module or a position sensor can be configured in the space terminal, and the space terminal can obtain the first position information of the space terminal in real time through the navigation receiver module or the position sensor, and then send the first position information to the first network device, so that the first network device can obtain the first position information.

[0058] In some embodiments, the three-dimensional space can be divided into multiple stereoscopic cells, and the coverage area of ​​each stereoscopic cell includes a three-dimensional stereoscopic area. The method of dividing the three-dimensional space into multiple stereoscopic cells can be set as needed and is not limited by this disclosure.

[0059] In some embodiments, the height dimension can be divided to obtain multiple height ranges, and the multiple height ranges can be used as a unified height reference. Based on the unified height reference, the three-dimensional area covered by the same beam of the same network device in the same height range can be regarded as a three-dimensional cell.

[0060] The method for dividing the height dimension to obtain multiple height ranges can be predefined. For example, the height level division method of the BeiDou grid location code can be used, or customized settings can be made based on the type, distribution characteristics, service type, etc. of the space terminal of the communication system. The embodiments of the present disclosure are not limited to this.

[0061] Referring to the schematic diagram of the division method of the three-dimensional cell shown in FIG3 , taking the network device as a satellite as an example, a three-dimensional cell with a global unified address can be established.

[0062] In which, taking the satellite communication system including C constellation systems as an example, the cth constellation system includes S c satellites, of which s c Satellites contain M beams, the sth cSatellites serve N space terminals. c , M is an integer greater than 0, N is an integer greater than or equal to 0, c is an integer between 1 and C (including 1 and C), s c 1 to S c Integer between 1 and S c 3 , a satellite communication system includes a satellite system 301 and a satellite system 302. Satellite system 301 includes one satellite, which includes beam 1, beam 2, ..., beam M. Satellite system 302 includes two satellites, each of which includes one beam.

[0063] Referring to Figure 3, taking the Beidou grid position code as a reference, we can divide it in the height dimension to get L height ranges, namely H1, H2, ..., H in Figure 3. L . Wherein L is an integer greater than 1. Taking the set of L altitude ranges as a unified altitude benchmark and using this benchmark as a basic condition, the coverage range of multiple satellites and multiple beams in multiple constellation systems can be divided into multiple stereo cells. Among them, the three-dimensional area covered by the same beam of the same satellite in the same altitude range is a stereo cell. For example, the beam M included in the satellite system 301 covers L stereo cells, wherein the L stereo cells are respectively in L altitude ranges, and the identifiers of the L stereo cells can be: stereo cell (M, 1), stereo cell (M, 2), ..., stereo cell (M, L). Among them, the stereo cell identified as (M, L) includes the three-dimensional area covered by the Mth beam in the Lth altitude range.

[0064] Among them, the first three-dimensional cell is the three-dimensional cell where the space terminal is currently located, covering the first position where the space terminal is currently located, and the first three-dimensional cell is provided with services by the first network device.

[0065] Step 202: Determine a second three-dimensional cell to be switched by the space terminal according to the second location information of the space terminal after a preset time period and a cell switching strategy.

[0066] The preset time period can be set as needed, and this disclosure does not impose any restrictions on this.

[0067] The second location information is the information of the second location of the space terminal after a preset time period, which may include longitude information, latitude information, altitude information, etc.

[0068] In some embodiments, the space terminal can predict its second location after a preset time period and send the information of the second location, i.e., the second location information, to the first network device, so that the first network device can obtain the second location information.

[0069] The second 3D cell is a 3D cell that the spatial terminal is predicted to enter after a preset time period. The number of second 3D cells may be one or more, and this disclosure does not impose any restrictions thereon. Any second 3D cell may be served by the first network device or by another network device.

[0070] The cell switching strategy is a strategy for determining a second three-dimensional cell from a plurality of three-dimensional cells, and can be set as needed, and the present disclosure does not impose any limitation on this.

[0071] In some embodiments, the cell switching strategy may include determining a 3D cell covering the second position as the second 3D cell. Step 202 may be implemented as follows: based on the second position information of the spatial terminal after a preset time period, determining a 3D cell covering the second position from a plurality of 3D cells, and determining the 3D cell covering the second position as the second 3D cell.

[0072] In some embodiments, the cell switching strategy may include determining a 3D cell whose distance from the second location is less than a preset distance threshold as the second 3D cell. Step 202 may be implemented as follows: based on the second location information of the space terminal after a preset time period, determine, from a plurality of 3D cells, a 3D cell whose distance from the second location is less than a preset distance threshold, and determine the 3D cell as the second 3D cell.

[0073] In some embodiments, the cell switching strategy may include: determining, among candidate 3D cells, a 3D cell having a signal strength greater than a preset signal strength threshold as a second 3D cell, wherein the candidate 3D cell is a 3D cell having a distance from the second location less than a preset distance threshold. Step 202 may be implemented as follows: based on the second location information of the spatial terminal after a preset time period, determining, from a plurality of 3D cells, a candidate 3D cell having a distance from the second location less than a preset distance threshold, and determining, among the candidate 3D cells, a 3D cell having a signal strength greater than the preset signal strength threshold as the second 3D cell.

[0074] In some embodiments, the cell switching strategy may include: determining, as a second 3D cell, a 3D cell whose frequency difference with the first 3D cell is less than a preset frequency threshold among the candidate 3D cells, wherein the candidate 3D cell is a 3D cell whose distance from the second location is less than a preset distance threshold. Step 202 may be implemented as follows: based on the second location information of the spatial terminal after a preset time period, determining, from a plurality of 3D cells, a candidate 3D cell whose distance from the second location is less than a preset distance threshold, and determining, as the second 3D cell, a 3D cell whose frequency difference with the first 3D cell is less than the preset frequency threshold among the candidate 3D cells.

[0075] It should be noted that the above-mentioned cell switching strategies are only exemplary and cannot be understood as restrictions on cell switching strategies. Those skilled in the art can set cell switching strategies arbitrarily according to actual needs in actual applications, and the embodiments of the present disclosure do not limit this.

[0076] It is understandable that the user link between the space terminal and network devices such as satellites has large spatiotemporal scale characteristics, which increases the signaling transmission delay in the switching process and easily causes data transmission interruption. Therefore, when performing cell switching, the space terminal sends a measurement report to the network device, which has a large delay and reduces the performance of mobility management. The cell switching method of the embodiment of the present disclosure predicts the second stereoscopic cell to be switched based on the second position information of the space terminal after a preset time period by the first network device. This can avoid the space terminal sending a measurement report to the first network device, reduce the delay, and improve the accuracy of the determined second stereoscopic cell.

[0077] It should be noted that step 201 and step 202 may be executed simultaneously or one after the other, and the present disclosure does not limit the execution timing of steps 201 and 202.

[0078] Step 203: Send a switching message to the space terminal, instructing the space terminal to switch from the first 3D cell to the second 3D cell.

[0079] In some embodiments, when the second 3D cell is different from the first 3D cell, the first network device may send a switching message to the space terminal, wherein the switching message instructs the space terminal to switch from the first 3D cell to the second 3D cell based on the switching message.

[0080] In summary, the cell switching method provided by the embodiment of the present disclosure divides the service area of ​​the network device into three-dimensional stereoscopic cells, determines the first stereoscopic cell where the space terminal is currently located according to the first position information where the space terminal is currently located, determines the second stereoscopic cell to be switched by the space terminal according to the second position information where the space terminal is located after a preset time period and the cell switching strategy, sends a switching message to the space terminal, instructing the space terminal to switch from the first stereoscopic cell to the second stereoscopic cell, and can achieve the second stereoscopic cell to be switched for the space terminal in advance before the space terminal moves out of the first stereoscopic cell where it is currently located, thereby enabling the space terminal to switch to the second stereoscopic cell in time, thereby ensuring the continuity of service and the reliability of communication for the space terminal at any position in the three-dimensional space such as on the ground, on the sea or in the air, and improving the service quality. In addition, by predicting the second stereoscopic cell to be switched based on the second position information where the space terminal is located after a preset time period by the first network device, the space terminal can avoid sending a measurement report to the first network device, reducing the time delay and improving the accuracy of the determined second stereoscopic cell.

[0081] In addition, the cell switching method proposed in the embodiment of the present disclosure can be applied to satellite communication systems. It is aimed at multi-satellite operation and resource sharing scenarios of different constellation systems. Based on the beam coverage characteristics of each satellite in each satellite system, a three-dimensional cell with global unified addressing is established to enable space terminals to switch between different constellation systems, different satellites, and different beams, thereby ensuring the continuity of satellite communication services and the reliability of communications.

[0082] FIG4 is a schematic flow chart of a cell switching method according to an embodiment of the present disclosure.

[0083] The cell switching method is applied to a first network device, which is a network device currently providing services to a space terminal.

[0084] As shown in FIG4 , the method involved in the embodiment of the present disclosure includes the following steps 401 - 405 .

[0085] Step 401: Acquire first position information and motion state information of the space terminal from the space terminal.

[0086] Among them, the first location information is the information of the first location of the space terminal at the current moment, which may include longitude information, latitude information, altitude information, etc.

[0087] Among them, the motion state information may include the motion vector of the space terminal at any time, the running speed at the current time, and other information representing the motion state of the space terminal.

[0088] In some embodiments, the space terminal may be configured with an inertial navigation sensor, which can be used to obtain a motion vector at any time. The motion vector may include information such as three-axis acceleration, heading angle, pitch angle, and roll angle.

[0089] Step 402: Acquire the second location information of the space terminal after a preset time period based on the first location information and the motion state information.

[0090] The preset time period can be set as needed, and this disclosure does not impose any restrictions on this.

[0091] Among them, the second location information is the information of the second location of the space terminal after a preset time period, which may include longitude information, latitude information, altitude information, etc.

[0092] In some embodiments, the first position information includes first position coordinates in a terrestrial coordinate system; the second position information includes second position coordinates in a terrestrial coordinate system. Step 402 may be implemented by following the steps a, b, c, and d:

[0093] Step a: transform the first position coordinates according to the second transformation matrix from the earth coordinate system to the inertial coordinate system to obtain the third position coordinates of the space terminal in the inertial coordinate system.

[0094] Among them, the first position coordinates are the coordinates of the first position of the space terminal at the current moment.

[0095] t0 represents the current time, and p n,0 Represents the first position coordinate, where p n,0 ={λ n,0 ,φ n,0 ,h n,0}. Among them, λ n,0 Indicates the longitude value of the space terminal, φ n,0 Indicates the latitude value of the space terminal, h n,0 Indicates the height of the space terminal from the ground.

[0096] Then the spatial Cartesian coordinates of the space terminal in the earth coordinate system are in the form shown in the following formula (1):

[0097] Among them, e represents the Earth's flattening, R n It represents the inner radius of curvature of the normal section perpendicular to the meridian plane.

[0098] The first position coordinates can be transformed according to the second transformation matrix from the earth coordinate system to the inertial coordinate system in the manner shown in the following formula (2) to obtain the third position coordinates in the inertial coordinate system:

[0099] Among them, C ie Represents the transformation matrix from the earth coordinate system to the inertial coordinate system. For the sake of distinction, this transformation matrix is ​​called the second transformation matrix; Indicates the third position coordinate of the space terminal in the inertial coordinate system.

[0100] Step b: According to the motion state information, obtain the three-axis acceleration and running speed of the space terminal in the inertial coordinate system.

[0101] In some embodiments, the motion state information may include information indicating the motion state of the space terminal, such as the motion vector of the space terminal at any time and the current operating speed. The motion vector may include information such as the three-axis acceleration, heading angle, pitch angle, and roll angle in the carrier coordinate system. The current operating speed in the motion state information may be the operating speed of the space terminal in the inertial coordinate system.

[0102] Let t represent any time, and v n,t represents the motion vector of the space terminal n in the carrier coordinate system at time t. n,t ={a n,t ,α n,t ,β n,t ,γ n,t}. Among them, a n,t represents the three-axis acceleration of the space terminal n at time t, α n,t represents the heading angle of the space terminal n at time t, β n,t represents the pitch angle of the space terminal n at time t, γ n,t represents the roll angle of the space terminal n at time t.

[0103] Then we can use the following formula (3) to calculate a n,t Processing is performed to obtain the three-axis acceleration of the space terminal n in the inertial coordinate system at time t

[0104] Among them, C ib Represents the transformation matrix from the carrier coordinate system to the inertial coordinate system.

[0105] In some embodiments, C ib It can be obtained by the following formula (4): ib =C ie C et C tb (4)

[0106] Among them, C tb Represents the transformation matrix from the carrier coordinate system to the horizontal coordinate system, Cet Represents the transformation matrix from the horizontal coordinate system to the earth coordinate system, C ie Represents the transformation matrix from the Earth coordinate system to the inertial coordinate system.

[0107] Among them, C tb It can be obtained through the heading angle, pitch angle, roll angle and other information of the space terminal in the carrier coordinate system.

[0108] Step c: Obtain the displacement of the space terminal in the inertial coordinate system after a preset time period based on the third position coordinate, the running speed, and the three-axis acceleration.

[0109] In some embodiments, step c can be obtained by the following formula (5):

[0110] in, represents the displacement of the space terminal n in the inertial coordinate system after the preset time period Δt from the current time t0; Indicates the running speed of the space terminal at the current time t0; represents the three-axis acceleration of the space terminal n in the inertial coordinate system at time t; Indicates the third position coordinate of the space terminal in the inertial coordinate system.

[0111] Step d: transform the displacement according to the first transformation matrix from the inertial coordinate system to the earth coordinate system to obtain the second position coordinates.

[0112] Among them, the second position coordinates are the coordinates of the second position of the space terminal after a preset time period, and the position coordinates are the coordinates in the earth coordinate system.

[0113] In some embodiments, step d can be obtained by the following formula (6):

[0114] Among them, C ei Represents the transformation matrix from the inertial coordinate system to the earth coordinate system. For the sake of distinction, this transformation matrix is ​​called the first transformation matrix; Indicates the second position coordinates of the space terminal in the earth coordinate system.

[0115] Through the above process of obtaining the second position information based on the first position information and the motion state information, it can be known that the second position information is obtained by converting the displacement of the space terminal in the inertial coordinate system after a preset time period through the first conversion matrix based on the inertial coordinate system to the earth coordinate system; the displacement is obtained based on the third position coordinates, running speed and three-axis acceleration of the space terminal in the inertial coordinate system; the three-axis acceleration and running speed are obtained based on the motion state information; the third position coordinates are obtained by converting the first position coordinates through the second conversion matrix based on the earth coordinate system to the inertial coordinate system.

[0116] Step 403: Determine the first three-dimensional cell where the space terminal is currently located according to the first position information where the space terminal is currently located.

[0117] Among them, step 403 can be executed before step 402, or after step 402, or simultaneously with step 402. The present disclosure does not limit the execution timing of step 403. Step 403 only needs to be executed after step 401.

[0118] Step 404: Determine a second three-dimensional cell to be switched by the space terminal according to the second location information of the space terminal after a preset time period and the cell switching strategy.

[0119] Among them, step 404 can be executed before step 403, or after step 403, or simultaneously with step 403. The present disclosure does not limit the execution timing of step 404. Step 404 only needs to be executed after step 402.

[0120] Step 405: Send a switching message to the space terminal, instructing the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell.

[0121] The specific implementation process and principles of steps 403-405 can be referred to the description of other embodiments and will not be repeated here.

[0122] In summary, the cell switching method provided by the embodiment of the present disclosure divides the service area of ​​the network device into three-dimensional stereoscopic cells. The first network device obtains first position information and motion status information of the space terminal from the space terminal, and obtains second position information of the space terminal after a preset time period based on the first position information and motion status information. The first stereoscopic cell where the space terminal is currently located is determined based on the first position information where the space terminal is currently located. The second stereoscopic cell to which the space terminal is to be switched is determined based on the second position information where the space terminal is located after the preset time period and the cell switching strategy. A switching message is sent to the space terminal to instruct the space terminal to switch from the first stereoscopic cell to the second stereoscopic cell. This can achieve the prediction of the second stereoscopic cell to be switched for the space terminal in advance before the space terminal moves out of the current first stereoscopic cell, thereby enabling the space terminal to switch to the second stereoscopic cell in time. Therefore, for the space terminal at any position in the three-dimensional space such as on the ground, sea or in the air, the continuity of service and the reliability of communication can be guaranteed, thereby improving the service quality. Furthermore, by predicting the second 3D cell to be switched based on the second location information of the space terminal after a preset time period, the first network device can avoid the space terminal sending a measurement report to the first network device, reducing latency and improving the accuracy of the determined second 3D cell. Furthermore, the space terminal can only send its current first location information and motion status information to the first network device, reducing transmission resources and lowering communication system and link overhead.

[0123] FIG5 is a schematic flow chart of a cell switching method according to an embodiment of the present disclosure.

[0124] The cell switching method is applied to a first network device, which is a network device currently providing services to a space terminal.

[0125] As shown in FIG5 , the method involved in the embodiment of the present disclosure includes the following steps 501 - 509 .

[0126] Step 501: Determine a first three-dimensional cell where the space terminal is currently located according to first location information where the space terminal is currently located.

[0127] The first three-dimensional cell is served by the first network device.

[0128] Step 502: Determine a second three-dimensional cell to be switched by the space terminal according to the second location information of the space terminal after a preset time period and a cell switching strategy.

[0129] The specific implementation process and principles of steps 501-502 can be referred to the description of other embodiments and will not be repeated here.

[0130] Step 503 , determining whether the second 3D cell is within the coverage of the first network device. If yes, proceed to step 504 ; otherwise, proceed to step 508 .

[0131] Step 504 , determining whether the first network device has the capability of providing service resources of the second three-dimensional cell. If yes, execute step 505 ; if not, execute step 506 .

[0132] In some embodiments, when the second 3D cell is within the coverage of the first network device, it may be further determined whether the first network device has the capability of providing service resources for the second 3D cell.

[0133] Step 505: reserve service resources of the second three-dimensional cell.

[0134] Among them, service resources may include frequency resources, code resources and other resources used for communication.

[0135] In some embodiments, if the second 3D cell is within the coverage of the first network device and the first network device has the capability of providing service resources of the second 3D cell, the first network device may reserve service resources of the second 3D cell.

[0136] By reserving service resources of the second three-dimensional cell by the first network device, the continuity of communication can be ensured.

[0137] Step 506: Determine a third three-dimensional cell to which the spatial terminal is to switch, wherein the third three-dimensional cell is within the coverage of the third network device.

[0138] In some embodiments, when the second stereoscopic cell is within the coverage of the first network device and the first network device does not have the ability to provide service resources of the second stereoscopic cell, the first network device can determine a third stereoscopic cell to which the spatial terminal is to switch.

[0139] The method for determining the third three-dimensional cell is similar to the method for determining the second three-dimensional cell, and will not be described in detail here.

[0140] The third network device is a network device covering a third three-dimensional cell, and the network device is different from the first network device.

[0141] Step 507: Send a second handover negotiation message to the third network device, wherein the second handover negotiation message carries the identifier of the third 3D cell and instructs the third network device to reserve service resources of the third 3D cell.

[0142] In some embodiments, the first network device may send a second handover negotiation message to the third network device via an intersatellite link or a ground operation and control center. The second handover negotiation message carries an identifier of the third 3D cell, instructing the third network device to reserve service resources of the third 3D cell. The third network device can thereby reserve service resources of the third 3D cell.

[0143] In some embodiments, the second switching negotiation message may also carry the motion status information, location information, etc. of the space terminal, so that the third network device can predict the three-dimensional cell that the space terminal is about to enter based on the motion status information and location information of the space terminal, and reserve the resources of the three-dimensional cell.

[0144] By reserving service resources of the third three-dimensional cell through the third network device, the continuity of communication can be ensured.

[0145] Step 508 : When the second 3D cell is within the coverage of the second network device, a first handover negotiation message is sent to the second network device, wherein the first handover negotiation message carries the identifier of the second 3D cell and instructs the second network device to reserve service resources of the second 3D cell.

[0146] By reserving service resources of the second three-dimensional cell through the second network device, the continuity of communication can be ensured.

[0147] Step 509: Send a switching message to the space terminal, instructing the space terminal to switch from the first 3D cell to the second 3D cell.

[0148] In some embodiments, the switching message may carry an identifier of the second stereoscopic cell, instructing the space terminal to perform cell switching based on the identifier.

[0149] In some embodiments, a corresponding codeword can be assigned to each 3D cell so that a space terminal within each 3D cell can use the corresponding codeword for data transmission. In some embodiments, a codeword corresponding to the height of each 3D cell can be assigned to each 3D cell. The assigned codewords for any two 3D cells at different heights can be the same or different. The assigned codewords for any two 3D cells at the same height can be the same or different.

[0150] For example, the heights of the divided three-dimensional cells include height A, height B, height C, and height D. For the three-dimensional cell at height A, the code word C1 corresponding to height A can be assigned; for the three-dimensional cell at height B, the code word C2 corresponding to height B can be assigned; for the three-dimensional cell at height C, the code word C3 corresponding to height C can be assigned; for the three-dimensional cell at height D, the code word C4 corresponding to height D can be assigned. Among them, C1, C2, C3, and C4 are different. In this way, the three-dimensional cells at the same height can be assigned the same code word, and the three-dimensional cells at different heights can be assigned different code words.

[0151] Alternatively, the codeword C5 corresponding to heights A and B can be assigned to the 3D cells at height A and height B, respectively, and the codeword C6 corresponding to heights C and D can be assigned to the 3D cells at height C and height D, respectively. C5 and C6 are different. This allows 3D cells at the same height to be assigned the same codeword, while 3D cells at different heights can be assigned different codewords.

[0152] By allocating different code words to the three-dimensional cells at different heights, it is possible to avoid interference between the terminal devices in the three-dimensional cells at different heights when communicating with the network equipment.

[0153] It should be noted that the above method of allocating code words corresponding to the height of each 3D cell according to the height of each 3D cell is only an exemplary description. In actual applications, other methods can also be used to allocate corresponding code words to each 3D cell, and this disclosure does not limit this.

[0154] In addition, it should be noted that the coverage area of ​​the stereo cell in the embodiment of the present disclosure includes a three-dimensional stereo area. The height of the stereo cell can be the height of any position of the stereo cell, and the height can be an absolute height value or a relative height value, or a height range, and the height range is one of multiple height ranges obtained by dividing on the height dimension; or, the height of the stereo cell can also be the height range of the entire stereo cell, and the height range is one of multiple height ranges obtained by dividing on the height dimension. For example, in the case where the three-dimensional space is divided into multiple stereo cells in the manner shown in FIG3 , the height of the stereo cell (M, L) can be understood as the height range H. L The embodiment of the present disclosure does not limit the method of defining the height of the three-dimensional cell.

[0155] In some embodiments, when the first 3D cell and the second 3D cell are located at different altitudes, the codewords corresponding to the first 3D cell and the second 3D cell may be different. The handover message may carry codeword information corresponding to the altitude of the second 3D cell, instructing the space terminal to perform cell handover based on the codeword information. The codeword information is information related to the codeword corresponding to the altitude of the second 3D cell, such as a codeword identifier or specific codeword content, which is not limited in this disclosure.

[0156] In some embodiments, the codeword corresponding to the height at which the first 3D cell is located and the codeword corresponding to the height at which the second 3D cell is located may be orthogonal or quasi-orthogonal to each other.

[0157] In some embodiments, when the first 3D cell and the second 3D cell are covered by different beams, the handover message may carry information related to the beam covering the second 3D cell, instructing the space terminal to perform cell handover based on the information related to the beam. The information related to the beam may include one or more of information such as a beam identifier and a corresponding frequency of the beam.

[0158] The beam covering the second three-dimensional cell may be a beam included in the first network device or other network devices.

[0159] The following examples illustrate the information carried by the switching message in multiple scenarios.

[0160] When the first three-dimensional cell and the second three-dimensional cell are at different heights and are covered by different beams, the first network device can determine that the space terminal needs to perform codeword switching and beam switching, so that the switching message can carry: the codeword information corresponding to the height of the second three-dimensional cell and the relevant information of the beam covering the second three-dimensional cell, instructing the space terminal to perform cell switching based on the codeword information and the relevant information of the beam.

[0161] When the first three-dimensional cell and the second three-dimensional cell are at different heights and are covered by the same beam, the first network device can determine that the space terminal needs to perform code switching, and the beam remains unchanged, so that the switching message can carry: the code information corresponding to the height of the second three-dimensional cell, instructing the space terminal to perform cell switching based on the code information.

[0162] When the first three-dimensional cell and the second three-dimensional cell are at the same height and are covered by different beams, the first network device can determine that the space terminal needs to perform beam switching, and the codeword remains unchanged, so that the switching message can carry: relevant information of the beam covering the second three-dimensional cell, instructing the space terminal to perform cell switching based on the relevant information of the beam.

[0163] In summary, the cell switching method provided by the embodiment of the present disclosure divides the service area of ​​the network device into three-dimensional stereoscopic cells, determines the first stereoscopic cell where the space terminal is currently located according to the first position information where the space terminal is currently located, determines the second stereoscopic cell to be switched by the space terminal according to the second position information where the space terminal is located after a preset time period and the cell switching strategy, sends a switching message to the space terminal, instructing the space terminal to switch from the first stereoscopic cell to the second stereoscopic cell, and can achieve the second stereoscopic cell to be switched to the space terminal in advance before the space terminal moves out of the first stereoscopic cell where it is currently located, thereby enabling the space terminal to switch to the second stereoscopic cell in a timely manner, thereby ensuring service continuity and communication reliability for space terminals at any position in three-dimensional space such as on the ground, on the sea or in the air, and improving service quality. In addition, by predicting the second stereoscopic cell to be switched based on the second position information where the space terminal is located after a preset time period by the first network device, the space terminal can avoid sending a measurement report to the first network device, reducing delay and improving the accuracy of the determined second stereoscopic cell. By reserving service resources for the second stereoscopic cell, communication continuity can be guaranteed.

[0164] The cell switching method applied to a space terminal proposed in an embodiment of the present disclosure is described in detail below.

[0165] Figure 6 is a flow chart of a cell handover method according to an embodiment of the present disclosure. As shown in Figure 6, the method according to the embodiment of the present disclosure includes the following steps 601-602.

[0166] Step 601: Receive a switching message from a network device.

[0167] Among them, the network device that sends the switching message is the network device that currently provides services to the space terminal, such as the first network device in the aforementioned embodiment.

[0168] Step 602, based on the switching message, switches from the first three-dimensional cell where the space terminal is currently located to the second three-dimensional cell; wherein, the first three-dimensional cell is determined by the network device based on the first position information where the space terminal is currently located, and the second three-dimensional cell is determined by the network device based on the second position information where the space terminal is located after a preset time period and the cell switching strategy.

[0169] The switching message instructs the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell based on the switching message.

[0170] The first location information is the information of the first location of the space terminal at the current moment, which may include longitude information, latitude information, altitude information, etc.

[0171] In some embodiments, the first location information can be obtained by the space terminal and sent to the network device.

[0172] In some embodiments, a navigation receiver module or a position sensor can be configured in the space terminal. The space terminal can obtain the first position information of the space terminal in real time through the navigation receiver module or the position sensor, and then send the first position information to the network device, so that the network device can determine the first three-dimensional cell where the space terminal is currently located based on the first position information.

[0173] Among them, the first three-dimensional cell is the three-dimensional cell where the space terminal is currently located, covering the first position where the space terminal is currently located.

[0174] The preset time period can be set as needed, and this disclosure does not impose any restrictions on this.

[0175] The second location information is the information of the second location of the space terminal after a preset time period, which may include longitude information, latitude information, altitude information, etc.

[0176] In some embodiments, the space terminal can predict its second position after a preset time period and send the information of the second position, i.e., the second position information, to the network device, so that the network device determines the second three-dimensional cell based on the second position information of the space terminal after the preset time period.

[0177] The second 3D cell is the 3D cell predicted to be entered by the space terminal after a preset time period. The number of second 3D cells may be one or more, and this disclosure does not impose any restrictions thereon. Any second 3D cell may be served by the network device currently serving the space terminal, or by other network devices.

[0178] The cell switching strategy is a strategy for determining a second three-dimensional cell from multiple three-dimensional cells, which can be set as needed and is not limited in this disclosure. For explanations of the cell switching strategy, reference can be made to other embodiments and will not be repeated here.

[0179] In summary, the cell switching method provided by the embodiment of the present disclosure receives a switching message from a network device, and switches from the first three-dimensional cell where the space terminal is currently located to the second three-dimensional cell based on the switching message; wherein the first three-dimensional cell is determined by the network device based on the first position information where the space terminal is currently located, and the second three-dimensional cell is determined by the network device based on the second position information where the space terminal is located after a preset time period and the cell switching strategy. Thus, based on dividing the service area of ​​the network device into three-dimensional three-dimensional cells, the space terminal can switch from the current first three-dimensional cell to the second three-dimensional cell in a timely manner according to the switching message sent by the network device, thereby ensuring the continuity of communication with the network device and improving communication quality and communication reliability. Moreover, by predicting the second three-dimensional cell to be switched based on the second position information where the space terminal is located after a preset time period by the network device, it is possible to avoid the space terminal sending a measurement report to the network device, reduce the time delay, and improve the accuracy of the determined second three-dimensional cell.

[0180] Figure 7 is a flow chart of a cell handover method according to an embodiment of the present disclosure. As shown in Figure 7, the method according to the embodiment of the present disclosure is applied to a space terminal, and the method includes the following steps 701-703.

[0181] Step 701: Send the current first location information and motion status information of the space terminal to the network device. The first location information and motion status information are used to obtain the second location information of the space terminal after a preset time period.

[0182] Among them, the first location information is the information of the first location of the space terminal at the current moment, which may include longitude information, latitude information, altitude information, etc.

[0183] The motion state information may include information indicating the motion state of the space terminal, such as the motion vector of the space terminal at any time and the current running speed. The motion vector may include information such as three-axis acceleration, heading angle, pitch angle, and roll angle.

[0184] In some embodiments, the space terminal can be configured with an inertial navigation sensor, which can be used to obtain a motion vector at any time and then send the motion vector and motion state information such as the current running speed to the network device. The first position information is used by the network device to obtain the second position information and determine the first 3D cell in which the space terminal is currently located; the motion state information is used by the network device to obtain the second position information.

[0185] Step 702: Receive a switching message from a network device.

[0186] Step 703, based on the switching message, switch from the first three-dimensional cell where the space terminal is currently located to the second three-dimensional cell; wherein, the first three-dimensional cell is determined by the network device based on the first position information where the space terminal is currently located, and the second three-dimensional cell is determined by the network device based on the second position information where the space terminal is located after a preset time period and the cell switching strategy.

[0187] In some embodiments, the first 3D cell and the second 3D cell are located at different altitudes, and the switching message can carry codeword information corresponding to the altitude of the second 3D cell. Based on the codeword information, the spatial terminal can switch from the first 3D cell to the second 3D cell, thereby using the codeword corresponding to the codeword information to communicate with the network device. The codeword information is information related to the codeword corresponding to the altitude of the second 3D cell, such as the codeword identifier or the specific codeword content, and this disclosure does not limit this.

[0188] In some embodiments, the first 3D cell and the second 3D cell are covered by different beams. The handover message may carry information about the beam covering the second 3D cell. Based on this beam information, the space terminal may switch from the first 3D cell to the second 3D cell, thereby communicating with the network device based on this beam. The beam information may include one or more of the following: a beam identifier, a corresponding frequency of the beam, and so on.

[0189] In some embodiments, the first 3D cell and the second 3D cell are located at different altitudes and are covered by different beams. The handover message may carry: codeword information corresponding to the altitude of the second 3D cell and information related to the beam covering the second 3D cell. Based on the beam information and the codeword information, the space terminal may switch from the first 3D cell to the second 3D cell, thereby communicating with the network device using the codeword corresponding to the codeword information and the beam.

[0190] It should be noted that, in some embodiments, in the process of cell switching of the space terminal, resources not mentioned in the switching message may remain unchanged.

[0191] The cell switching method provided by the embodiment of the present disclosure sends the current first location information and the motion state information of the space terminal to the network device, the first location information and the motion state information are used to obtain the second location information of the space terminal after a preset time period, receives a switching message from the network device, and switches from the first stereoscopic cell where the space terminal is currently located to the second stereoscopic cell based on the switching message; wherein the first stereoscopic cell is determined by the network device based on the first location information where the space terminal is currently located, and the second stereoscopic cell is determined by the network device based on the second location information where the space terminal is located after a preset time period and the cell switching strategy. Thus, based on dividing the service area of ​​the network device into three-dimensional stereoscopic cells, the space terminal can switch from the current first stereoscopic cell to the second stereoscopic cell in a timely manner according to the switching message sent by the network device, thereby ensuring the continuity of communication with the network device and improving communication quality and communication reliability. In addition, by predicting the second stereoscopic cell to be switched based on the second location information where the space terminal is located after a preset time period by the network device, it is possible to avoid the space terminal sending a measurement report to the network device, reduce delay, and improve the accuracy of the determined second stereoscopic cell. In addition, the current first position information and motion status information are sent to the network device through the spatial terminal, which reduces the occupied transmission resources, reduces the overhead of the communication system and link, reduces the delay, and improves the accuracy of the second three-dimensional cell determined by the network device.

[0192] The embodiments of the present disclosure further provide an apparatus for implementing any of the above methods. For example, an apparatus is provided that includes units or modules for implementing each step performed by a network device in any of the above methods. For another example, another apparatus is provided that includes units or modules for implementing each step performed by a space terminal in any of the above methods.

[0193] It should be understood that the division of the various units or modules in the above device is merely a division of logical functions. In actual implementation, they may be fully or partially integrated into a physical entity, or they may be physically separated. In addition, the units or modules in the device may be implemented in the form of a processor calling software: for example, the device includes a processor, the processor is connected to a memory, and the memory stores instructions. The processor calls the instructions stored in the memory to implement any of the above methods or implement the functions of the various units or modules of the above device, wherein the processor is, for example, a general-purpose processor, such as a central processing unit (CPU) or a microprocessor, and the memory is a memory within the device or a memory outside the device. Alternatively, the units or modules in the device can be implemented in the form of hardware circuits, and the functions of some or all of the units or modules can be realized by designing the hardware circuits. The above-mentioned hardware circuits can be understood as one or more processors; for example, in one implementation, the above-mentioned hardware circuit is an application-specific integrated circuit (ASIC), which realizes the functions of some or all of the above units or modules by designing the logical relationship of the components in the circuit; for example, in another implementation, the above-mentioned hardware circuit can be realized by a programmable logic device (PLD). Taking a field programmable gate array (FPGA) as an example, it can include a large number of logic gate circuits, and the connection relationship between the logic gate circuits is configured by configuring the configuration file, thereby realizing the functions of some or all of the above units or modules. All units or modules of the above devices can be realized in the form of software called by the processor, or in the form of hardware circuits, or in part by the form of software called by the processor, and the rest by hardware circuits.

[0194] In the embodiments of the present disclosure, the processor is a circuit with signal processing capabilities. In one implementation, the processor can be a circuit with instruction reading and execution capabilities, such as a central processing unit (CPU), a microprocessor, a graphics processing unit (GPU) (which can be understood as a microprocessor), or a digital signal processor (DSP). In another implementation, the processor can implement certain functions through the logical relationship of the hardware circuit. The logical relationship of the above-mentioned hardware circuit is fixed or reconfigurable. For example, the processor is a hardware circuit implemented by an application-specific integrated circuit (ASIC) or a programmable logic device (PLD), such as an FPGA. In a reconfigurable hardware circuit, the process of the processor loading a configuration document and implementing the hardware circuit configuration can be understood as the process of the processor loading instructions to implement the functions of some or all of the above units or modules. In addition, it can also be a hardware circuit designed for artificial intelligence, which can be understood as an ASIC, such as a neural network processing unit (NPU), a tensor processing unit (TPU), a deep learning processing unit (DPU), etc.

[0195] FIG8 is a schematic diagram of the structure of a cell switching apparatus according to an embodiment of the present disclosure. The cell switching apparatus can be applied to a network device, such as the first network device described in the aforementioned embodiment. As shown in FIG8 , the cell switching apparatus 800 may include at least one of a transceiver module 801 and a processing module 802.

[0196] In some embodiments, the above-mentioned processing module 802 is used to determine the first three-dimensional cell where the space terminal is currently located based on the first position information where the space terminal is currently located, and to determine the second three-dimensional cell to be switched by the space terminal based on the second position information where the space terminal is located after a preset time period and the cell switching strategy; the transceiver module 801 is used to send a switching message to the space terminal, instructing the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell.

[0197] In some embodiments, the transceiver module 801 is used to obtain first position information and motion status information of the space terminal from the space terminal; the processing module 802 is used to obtain second position information based on the first position information and motion status information.

[0198] In some embodiments, the first position information includes a first position coordinate in the earth coordinate system; the second position information includes a second position coordinate in the earth coordinate system; the second position information is obtained by converting the displacement of the space terminal in the inertial coordinate system after a preset time period by a first conversion matrix based on the inertial coordinate system to the earth coordinate system; the displacement is obtained based on the third position coordinate, running speed and three-axis acceleration of the space terminal in the inertial coordinate system; the three-axis acceleration and running speed are obtained based on the motion state information; the third position coordinate is obtained by converting the first position coordinate by a second conversion matrix based on the earth coordinate system to the inertial coordinate system.

[0199] In some embodiments, the first 3D cell and the second 3D cell are located at different altitudes, and the switching message carries codeword information corresponding to the altitude of the second 3D cell, instructing the space terminal to perform cell switching based on the codeword information.

[0200] In some embodiments, the codeword corresponding to the height at which the first 3D cell is located and the codeword corresponding to the height at which the second 3D cell is located are orthogonal or quasi-orthogonal to each other.

[0201] In some embodiments, the first stereo cell and the second stereo cell are covered by different beams, and the switching message carries relevant information of the beam covering the second stereo cell, instructing the space terminal to perform cell switching based on the relevant information of the beam.

[0202] In some embodiments, the transceiver module 801 is configured to:

[0203] When the second 3D cell is within the coverage of the second network device, a first handover negotiation message is sent to the second network device, wherein the first handover negotiation message carries an identifier of the second 3D cell and instructs the second network device to reserve service resources of the second 3D cell.

[0204] In some embodiments, the processing module 802 is configured to:

[0205] When the second 3D cell is within the coverage of the first network device and the first network device has the capability of providing service resources of the second 3D cell, the service resources of the second 3D cell are reserved.

[0206] In some embodiments, the processing module 802 is configured to: determine a third 3D cell to be switched by the spatial terminal when the second 3D cell is within the coverage of the first network device and the first network device does not have the capability to provide service resources of the second 3D cell, wherein the third 3D cell is within the coverage of the third network device;

[0207] The transceiver module 801 is configured to send a second handover negotiation message to a third network device, wherein the second handover negotiation message carries an identifier of a third 3D cell and instructs the third network device to reserve service resources of the third 3D cell.

[0208] FIG9 is a schematic diagram of the structure of a cell switching device proposed in an embodiment of the present disclosure. The cell switching device can be applied to a space terminal. As shown in FIG9 , the cell switching device 900 may include at least one of a transceiver module 901 and a processing module 902 .

[0209] In some embodiments, the above-mentioned transceiver module 901 is used to receive a switching message from a network device; the processing module 902 is used to switch from the first three-dimensional cell where the space terminal is currently located to the second three-dimensional cell based on the switching message; wherein, the first three-dimensional cell is determined by the network device based on the first position information where the space terminal is currently located, and the second three-dimensional cell is determined by the network device based on the second position information where the space terminal is located after a preset time period and the cell switching strategy.

[0210] In some embodiments, the transceiver module 901 is used to send the first location information to the network device.

[0211] In some embodiments, the transceiver module 901 is used to: send first location information and motion status information of the space terminal to the network device, where the first location information and motion status information are used to obtain second location information.

[0212] In some embodiments, the first 3D cell and the second 3D cell are at different altitudes, and the switching message carries codeword information corresponding to the altitude of the second 3D cell; the processing module 902 is configured to: switch from the first 3D cell to the second 3D cell based on the codeword information.

[0213] In some embodiments, the first 3D cell and the second 3D cell are covered by different beams, and the switching message carries relevant information of the beam covering the second 3D cell; the processing module 902 is used to switch from the first 3D cell to the second 3D cell based on the relevant information of the beam.

[0214] Figure 10 is a schematic diagram of the structure of a communication device 1000 proposed in an embodiment of the present disclosure. Communication device 1000 can be a network device, a space terminal, a chip, a chip system, or a processor that supports a network device to implement any of the above methods, or a chip, a chip system, or a processor that supports a space terminal to implement any of the above methods. Communication device 1000 can be used to implement the methods described in the above method embodiments. For details, please refer to the description of the above method embodiments.

[0215] As shown in Figure 10, the communication device 1000 includes one or more processors 1001. The processor 1001 can be a general-purpose processor or a dedicated processor, for example, a baseband processor or a central processing unit. The baseband processor can be used to process communication protocols and communication data, and the central processing unit can be used to control communication devices (such as base stations, baseband chips, terminals, terminal chips, distributed units (DUs) or centralized units (CUs), etc.), execute programs, and process program data. The processor 1001 is used to call instructions to enable the communication device 1000 to perform any of the above methods.

[0216] In some embodiments, the communication device 1000 also includes one or more memories 1002 for storing instructions. In some embodiments, all or part of the memory 1002 may also be external to the communication device 1000.

[0217] In some embodiments, the communication device 1000 further includes one or more transceivers 1003. When the communication device 1000 includes one or more transceivers 1003, the communication steps such as sending and receiving in the above method are performed by the transceiver 1003, and the other steps are performed by the processor 1001.

[0218] In some embodiments, the transceiver 1003 may include a receiver and a transmitter, which may be separate or integrated. In some embodiments, the terms transceiver, transceiver unit, transceiver, and transceiver circuit may be used interchangeably; the terms transmitter, transmitting unit, transmitter, and transmitting circuit may be used interchangeably; and the terms receiver, receiving unit, receiver, and receiving circuit may be used interchangeably.

[0219] In some embodiments, the communication device 1000 further includes one or more interface circuits 1004, which are connected to the memory 1002. The interface circuits 1004 can be used to receive signals from the memory 1002 or other devices, and can be used to send signals to the memory 1002 or other devices. For example, the interface circuits 1004 can read instructions stored in the memory 1002 and send the instructions to the processor 1001.

[0220] The communication device 1000 described in the above embodiments may be a network device or a space terminal, but the scope of the communication device 1000 described in the present disclosure is not limited thereto, and the structure of the communication device 1000 may not be limited by FIG10. The communication device may be an independent device or may be part of a larger device. For example, the communication device may be: 1) an independent integrated circuit (IC), or a chip, or a chip system or subsystem; (2) a collection of one or more ICs. In some embodiments, the above IC collection may also include a storage component for storing data or programs; (3) an ASIC, such as a modem; (4) a module that can be embedded in other devices; (5) a receiver, a terminal, an intelligent terminal, a cellular phone, a wireless device, a handheld device, a mobile unit, a vehicle-mounted device, a network device, a cloud device, an artificial intelligence device, etc.; (6) others, etc.

[0221] FIG11 is a schematic diagram of the structure of a chip 1100 according to an embodiment of the present disclosure. If the communication device 1000 can be a chip or a chip system, reference can be made to the schematic diagram of the structure of the chip 1100 shown in FIG11 , but the present disclosure is not limited thereto.

[0222] The chip 1100 includes one or more processors 1101 , and the processor 1101 is used to call instructions so that the chip 1100 executes any of the above methods.

[0223] In some embodiments, chip 1100 further includes one or more interface circuits 1102, which are connected to memory 1103. Interface circuits 1102 can be used to receive signals from memory 1103 or other devices, and can be used to send signals to memory 1103 or other devices. For example, interface circuit 1102 can read instructions stored in memory 1103 and send the instructions to processor 1101. In some embodiments, the terms interface circuit, interface, transceiver pin, and transceiver are interchangeable.

[0224] In some embodiments, chip 1100 further includes one or more memories 1103 for storing instructions. In some embodiments, all or part of memory 1103 may be external to chip 1100.

[0225] The present disclosure also proposes a communication system, which includes: a network device and a space terminal; wherein the above-mentioned network device is configured to execute the method described in the first aspect or the optional implementation of the first aspect, and the above-mentioned space terminal is configured to execute the method described in the second aspect or the optional implementation of the second aspect.

[0226] The present disclosure also provides a storage medium having instructions stored thereon. When the instructions are executed on the communication device 1000, the communication device 1000 is caused to perform any of the above methods. In some embodiments, the storage medium is an electronic storage medium. In some embodiments, the storage medium is a computer-readable storage medium, but is not limited thereto and may also be a storage medium readable by other devices. In some embodiments, the storage medium may be a non-transitory storage medium, but is not limited thereto and may also be a transient storage medium.

[0227] The present disclosure also provides a program product, which, when executed by the communication device 1000, enables the communication device 1000 to perform any of the above methods. In some embodiments, the program product is a computer program product.

[0228] The present disclosure also proposes a computer program, which, when executed on a computer, causes the computer to perform any one of the above methods.

[0229] It is understandable that the above-mentioned cell switching device, network equipment, space terminal, communication system, storage medium, program product, and computer program are all used to execute the method proposed in the embodiment of the present disclosure. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects of the corresponding method and will not be repeated here.

[0230] In some embodiments, terms such as cell switching method, information processing method, communication method, etc. can be replaced with each other, terms such as cell switching device, information processing device, communication device, etc. can be replaced with each other, and terms such as information processing system, communication system, etc. can be replaced with each other.

[0231] The embodiments of the present disclosure are not exhaustive and are merely illustrative of some embodiments, and are not intended to be a specific limitation on the scope of protection of the present disclosure. In the absence of contradiction, each step in a certain embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a certain embodiment can also be implemented as an independent embodiment, and the order of the steps in a certain embodiment can be arbitrarily exchanged. In addition, the optional implementation methods in a certain embodiment can be arbitrarily combined; in addition, the embodiments can be arbitrarily combined. For example, some or all steps of different embodiments can be arbitrarily combined, and a certain embodiment can be arbitrarily combined with the optional implementation methods of other embodiments.

[0232] In each embodiment of the present disclosure, unless otherwise specified or provided for by logic, the terms and / or descriptions between the embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form a new embodiment based on their inherent logical relationships.

[0233] The terms used in the embodiments of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure.

[0234] In the embodiments of the present disclosure, unless otherwise specified, elements expressed in the singular, such as "a", "an", "the", "above", "said", "the", "the", etc., may mean "one and only one", or "one or more", "at least one", etc. For example, when using articles such as "a", "an", "the" in English in translation, the noun following the article may be understood as a singular expression or a plural expression.

[0235] In the embodiments of the present disclosure, “plurality” refers to two or more.

[0236] In some embodiments, "A or B" and other descriptions may include the following technical solutions depending on the situation: in some embodiments, A (A is executed independently of B); in some embodiments, B (B is executed independently of A); in some embodiments, execution is selected from A and B (A and B are selectively executed). The above is also applicable when there are more branches such as A, B, C, etc.

[0237] The prefixes such as "first" and "second" in the embodiments of the present disclosure are only used to distinguish different description objects and do not constitute any restriction on the position, order, priority, quantity or content of the description objects. For the statement of the description object, please refer to the description in the context of the claims or embodiments, and no unnecessary restriction should be constituted due to the use of prefixes. For example, if the description object is a "field", the ordinal number before the "field" in the "first field" and the "second field" does not limit the position or order between the "fields". "First" and "second" do not limit whether the "fields" they modify are in the same message, nor do they limit the order of the "first field" and the "second field". For another example, if the description object is a "level", the ordinal number before the "level" in the "first level" and the "second level" does not limit the priority between the "levels". For another example, the number of description objects is not limited by the ordinal number and can be one or more. Taking "first device" as an example, the number of "devices" can be one or more. In addition, the objects modified by different prefixes can be the same or different. For example, if the description object is "device", then the "first device" and the "second device" can be the same device or different devices, and their types can be the same or different; for another example, if the description object is "information", then the "first information" and the "second information" can be the same information or different information, and their contents can be the same or different.

[0238] In some embodiments, “including E”, “comprising E”, “used to indicate E”, and “carrying E” can be interpreted as directly carrying E or indirectly indicating E.

[0239] In some embodiments, terms such as "greater than", "greater than or equal to", "not less than", "more than", "more than or equal to", "not less than", "higher than", "higher than or equal to", "not less than", and "above" can be replaced with each other, and terms such as "less than", "less than or equal to", "not greater than", "less than", "less than or equal to", "not more than", "lower than", "lower than or equal to", "not higher than", and "below" can be replaced with each other.

[0240] In some embodiments, devices, etc. can be interpreted as physical or virtual, and their names are not limited to the names recorded in the embodiments. Terms such as "device", "equipment", "device", "circuit", "network element", "node", "function", "unit", "section", "system", "network", "chip", "chip system", "entity", and "subject" can be used interchangeably.

[0241] In some embodiments, the terms "terminal", "terminal device", "user equipment (UE)", "user terminal", "mobile station (MS)", "mobile terminal (MT)", subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset, user agent, mobile client, client, etc. can be used interchangeably.

[0242] In some embodiments, the terms "codebook," "codeword," and "precoding matrix" may be used interchangeably. For example, a codebook may be a collection of one or more codewords / precoding matrices.

[0243] In some embodiments, the names of information, etc. are not limited to the names described in the embodiments, and terms such as "information", "message", "signal", "signaling", "report", "configuration", "indication", "instruction", "command", "channel", "parameter", "domain", "field", "symbol", "symbol", "codeword", "codebook", "codeword", "codepoint", "bit", "data", "program", and "chip" can be used interchangeably.

[0244] In some embodiments, obtaining data, information, etc. may comply with the laws and regulations of the country where the data is obtained.

[0245] In some embodiments, data, information, etc. may be obtained with the user's consent.

[0246] In the above embodiments, all or part of the embodiments can be implemented by software, hardware, firmware or any combination thereof. When implemented using software, all or part of the embodiments can be implemented in the form of a computer program product. The computer program product includes one or more computer programs. When the computer program is loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present disclosure are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer program can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer program can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be accessed by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0247] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professionals and technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this disclosure.

[0248] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0249] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A cell switching method, in, The method is applied to a first network device, and the method includes: Determine, according to the first position information of the space terminal currently located, a first three-dimensional cell where the space terminal is currently located; Determine a second three-dimensional cell to be switched by the space terminal according to the second location information of the space terminal after a preset time period and a cell switching strategy; A switching message is sent to the space terminal to instruct the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell.

2. The method according to claim 1, in, The method further comprises: Acquire the first position information and the motion state information of the space terminal from the space terminal; The second position information is acquired according to the first position information and the motion state information.

3. The method according to claim 2, in, The first position information includes a first position coordinate in the earth coordinate system; the second position information includes a second position coordinate in the earth coordinate system; the second position information is obtained by converting the displacement of the space terminal in the inertial coordinate system after the preset time period based on a first conversion matrix from the inertial coordinate system to the earth coordinate system; the displacement is obtained based on the third position coordinate, running speed and three-axis acceleration of the space terminal in the inertial coordinate system; the three-axis acceleration and the running speed are obtained based on the motion state information; the third position coordinate is obtained by converting the first position coordinate by a second conversion matrix from the earth coordinate system to the inertial coordinate system.

4. The method according to any one of claims 1 to 3, in, The first three-dimensional cell and the second three-dimensional cell are located at different altitudes, and the switching message carries codeword information corresponding to the altitude of the second three-dimensional cell, instructing the space terminal to perform cell switching based on the codeword information.

5. The method according to claim 4, in, The codeword corresponding to the height where the first 3D cell is located and the codeword corresponding to the height where the second 3D cell is located are orthogonal or quasi-orthogonal to each other.

6. The method according to any one of claims 1 to 5, in, The first stereo cell and the second stereo cell are covered by different beams, and the switching message carries relevant information of the beam covering the second stereo cell, instructing the space terminal to perform cell switching based on the relevant information of the beam.

7. The method according to any one of claims 1 to 6, in, The method further comprises: When the second stereoscopic cell is within the coverage of the second network device, a first switching negotiation message is sent to the second network device, wherein the first switching negotiation message carries an identifier of the second stereoscopic cell and instructs the second network device to reserve service resources of the second stereoscopic cell.

8. The method according to any one of claims 1 to 6, in, The method further comprises: The second three-dimensional cell is within the coverage of the first network device, and the first network device has the function of providing the second three-dimensional cell. When the service resources of the three-dimensional cell are sufficient, the service resources of the second three-dimensional cell are reserved.

9. The method according to any one of claims 1 to 6, in, The method further comprises: When the second 3D cell is within the coverage of the first network device and the first network device does not have the ability to provide service resources of the second 3D cell, determine a third 3D cell to be switched by the spatial terminal, wherein the third 3D cell is within the coverage of the third network device; A second handover negotiation message is sent to the third network device, wherein the second handover negotiation message carries an identifier of the third three-dimensional cell and instructs the third network device to reserve service resources of the third three-dimensional cell.

10. A cell switching method, in, The method is applied to a space terminal, and the method includes: receiving a switching message from a network device; Based on the switching message, switching from the first three-dimensional cell where the space terminal is currently located to the second three-dimensional cell; Among them, the first three-dimensional cell is determined by the network device based on the first location information of the current space terminal, and the second three-dimensional cell is determined by the network device based on the second location information of the space terminal after a preset time period and the cell switching strategy.

11. The method according to claim 10, in, The method further comprises: The first location information is sent to the network device.

12. The method according to claim 10, in, The method further comprises: The first location information and the motion status information of the space terminal are sent to the network device, where the first location information and the motion status information are used to obtain the second location information.

13. The method according to any one of claims 10 to 12, in, The first 3D cell and the second 3D cell are located at different heights, and the switching message carries codeword information corresponding to the height of the second 3D cell; The switching from the first 3D cell where the space terminal is currently located to the second 3D cell based on the switching message includes: Based on the codeword information, switch from the first stereoscopic cell to the second stereoscopic cell.

14. The method according to any one of claims 10 to 13, in, The first stereoscopic cell and the second stereoscopic cell are covered by different beams, and the switching message carries relevant information of the beam covering the second stereoscopic cell; The switching from the first 3D cell where the space terminal is currently located to the second 3D cell based on the switching message includes: Based on the relevant information of the beam, switch from the first stereoscopic cell to the second stereoscopic cell.

15. A cell switching device, in, The device is applied to a first network device, and the device includes: A processing module, configured to determine a first three-dimensional cell where the space terminal is currently located according to first location information where the space terminal is currently located, and to determine a second three-dimensional cell to be switched by the space terminal according to second location information where the space terminal is located after a preset time period and a cell switching strategy; The transceiver module is used to send a switching message to the space terminal, instructing the space terminal to switch from the first three-dimensional cell to the second three-dimensional cell.

16. A cell switching device, in, The device is applied to a space terminal, and the device includes: A transceiver module, used for receiving a switching message from a network device; A processing module, configured to switch from a first stereoscopic cell where the space terminal is currently located to a second stereoscopic cell based on the switching message; Among them, the first three-dimensional cell is determined by the network device based on the first location information of the current space terminal, and the second three-dimensional cell is determined by the network device based on the second location information of the space terminal after a preset time period and the cell switching strategy.

17. A network device, in, include: one or more processors; one or more memories for storing instructions; The processor is used to call the instruction so that the network device executes the cell switching method according to any one of claims 1 to 9.

18. A space terminal, It is characterized in that include: one or more processors; one or more memories for storing instructions; The processor is used to call the instruction so that the space terminal executes the cell switching method described in any one of claims 10-14.

19. A communication system, It is characterized in that Including network equipment and space terminals; The network device is configured to implement the cell switching method described in any one of claims 1-9, and the space terminal is configured to implement the cell switching method described in any one of claims 10-14.

20. A storage medium storing instructions, It is characterized in that When the instruction is executed on a communication device, the communication device is enabled to execute the cell switching method according to any one of claims 1 to 9, or execute the cell switching method according to any one of claims 10 to 14.

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