Inter-satellite switching method and device, base station communication equipment and readable storage medium

Abstract

The invention relates to an inter-satellite switching method and device, base station communication equipment and a computer readable storage medium. The method comprises the following steps: determining an inter-satellite switching area, and grouping terminals in the inter-satellite switching area to obtain terminal groups; sending a switching request message corresponding to the terminal group to a target base station; and switching the terminal group from the source base station to the target base station according to a switching request response returned by the target base station. By adopting the method, the terminals in the inter-satellite switching area can be grouped, and a plurality of terminals in the group are switched through one-time interaction, so that the number of signaling generated in the switching process is reduced, and signaling congestion during access to the target base station is avoided.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an inter-satellite handover method, apparatus, base station communication equipment, and computer-readable storage medium. Background Art

[0002] Handover (HO) refers to the channel switching performed when a user equipment (UE) moves from one cell to another in order to maintain uninterrupted communication of the UE. It is widely used in mobile communication systems.

[0003] In terrestrial mobile communications, base stations usually remain stationary, and cell switching is triggered by the movement of UEs, such as leaving the coverage of the source base station. In non-terrestrial communications (NTN) scenarios, satellite base stations move faster, and the coverage of satellite base stations usually changes, resulting in UE switching within the cell. It can be seen that in terrestrial mobile communications, switching triggered by UE movement is discrete in time, and concentrated switching rarely occurs. In NTN scenarios, cell switching is usually triggered by satellite movement, involving concentrated switching of some or all UEs. When a large number of UEs access the target base station, it is easy to form a "signaling storm", resulting in congestion in access to the target base station, which in turn affects the success rate of switching.

[0004] Therefore, the current inter-satellite handover technology has the problem of signaling congestion when accessing the target base station. Summary of the invention

[0005] Based on this, it is necessary to provide an inter-satellite handover method, apparatus, base station communication equipment, mobile communication equipment, computer-readable storage medium and computer program product that can avoid congestion in response to the above technical problems.

[0006] In a first aspect, the present application provides an inter-satellite handover method, which is applied to a source base station, comprising:

[0007] Determine an inter-satellite handover area, and group terminals in the inter-satellite handover area to obtain a terminal group;

[0008] Sending a handover request message corresponding to the terminal group to the target base station;

[0009] According to the handover request response returned by the target base station, the terminal groups are handed over from the source base station to the target base station in groups.

[0010] In a second aspect, the present application further provides an inter-satellite handover method, which is applied to a target base station, comprising:

[0011] receiving a handover request message sent by a source base station; the handover request message corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0012] According to the handover request message, a handover request response is returned to the source base station, so that the source base station switches the terminal groups from the source base station to the target base station in groups according to the handover request response.

[0013] In a third aspect, the present application further provides an inter-satellite handover method, which is applied to a terminal, comprising:

[0014] receiving a handover instruction sent by a source base station; the handover instruction corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0015] According to the switching instruction, other terminals in the same terminal group are switched from the source base station to the target base station as a group.

[0016] In a fourth aspect, the present application further provides an inter-satellite handover device, which is applied to a source base station, including:

[0017] A terminal grouping module, used to determine an inter-satellite handover area, and group terminals in the inter-satellite handover area to obtain a terminal group;

[0018] A request sending module, used to send a handover request message corresponding to the terminal group to the target base station;

[0019] The switching indication module is used to switch the terminal groups from the source base station to the target base station according to the switching request response returned by the target base station.

[0020] In a fifth aspect, the present application further provides an inter-satellite handover device, applied to a target base station, comprising:

[0021] A request receiving module, configured to receive a handover request message sent by a source base station; the handover request message corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0022] The response sending module is used to return a switching request response to the source base station according to the switching request message, so that the source base station switches the terminal groups from the source base station to the target base station according to the switching request response.

[0023] In a sixth aspect, the present application further provides an inter-satellite switching device, applied to a terminal, comprising:

[0024] An instruction receiving module, configured to receive a handover instruction sent by a source base station; the handover instruction corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0025] The inter-satellite switching module is used to switch from the source base station to the target base station in groups with other terminals in the same terminal group according to the switching instruction.

[0026] In the seventh aspect, the present application also provides a base station communication device, including a memory and a processor, the memory storing a computer program, and the processor implementing the method described in the first aspect or the second aspect when executing the computer program.

[0027] In an eighth aspect, the present application further provides a mobile communication device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the method described in the third aspect when executing the computer program.

[0028] In a ninth aspect, the present application further provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method described in the first aspect, the second aspect or the third aspect above is implemented.

[0029] In the tenth aspect, the present application also provides a computer program product, including a computer program, which, when executed by a processor, implements the method described in the first aspect, the second aspect or the third aspect above.

[0030] The above-mentioned inter-satellite switching method, device, base station communication equipment, mobile communication equipment, computer-readable storage medium and computer program product determine the inter-satellite switching area, group the terminals in the inter-satellite switching area, obtain the terminal group, send the switching request message corresponding to the terminal group to the target base station, and switch the terminal group from the source base station to the target base station according to the switching request response returned by the target base station; the terminals in the inter-satellite switching area can be grouped, and multiple terminals in the group can be interactively switched at one time to reduce the amount of signaling generated during the switching process, thereby avoiding signaling congestion when accessing the target base station. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the drawings required for use in the embodiments of the present application or related technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 is an application environment diagram of an inter-satellite handover method in an embodiment;

[0033] Figure 2 is an application environment diagram of an inter-satellite handover method in another embodiment;

[0034] Figure 3 is a schematic flow chart of an inter-satellite handover method in an embodiment;

[0035] Figure 4 is a schematic flow chart of an inter-satellite handover method in another embodiment;

[0036] Figure 5 is a schematic flow chart of an inter-satellite handover method in another embodiment;

[0037] Figure 6 is an interactive flow chart of an inter-satellite handover method in an embodiment;

[0038] Figure 7 A schematic diagram of a flow chart of implementing inter-satellite handover in an embodiment;

[0039] Figure 8 A schematic diagram of a signaling process for implementing inter-satellite handover in an embodiment;

[0040] Fig. 9 A schematic diagram of a signaling process for implementing group-based inter-satellite handover based on random access-free handover in one embodiment;

[0041] Fig.10 The figure is a schematic diagram of the signaling process for implementing group-based inter-satellite switching based on resynchronization satellite switching in another embodiment. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0043] It should be noted that the terms "first", "second", etc. in the specification and claims of the present disclosure and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present disclosure described herein can be implemented in an order other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are merely examples of devices and methods consistent with some aspects of the present disclosure as detailed in the appended claims.

[0044] The inter-satellite handover method provided in the embodiment of the present application can be applied to Figure 1 to Figure 2In the application environment shown. Among them, S-gNB1 represents the source base station 102, S-gNB2 represents the target base station 104, the source base station 102 and the target base station 104 can be base stations deployed on different satellites. It can be understood that the source base station 102 and the target base station 104 can also be deployed on different high-altitude platforms (such as drones, stratospheric balloons, etc.) or other non-ground carriers. The source base station 102 and the target base station 104 can communicate with the ground terminal 106, and the source base station 102 and the target base station 104 can also communicate with each other.

[0045] Among them, the base station can be an evolutionary Node B (eNB or eNodeB) in an LTE or evolved LTE system (LTE-Advanced, LTE-A); or it can be a next-generation Node B (gNB or gNodeB) in a 5G system; or it can be a next-generation base station in a 6G system; or it can be a transmission reception point (TRP); or it can be a base station in a future evolved public land mobile network (PLMN); or it can be a broadband network service gateway (Broadband Network Gateway, BNG), a convergence switch or a non-3GPP access device; or it can be a wireless controller in a cloud radio access network (Cloud Radio Access Network, CRAN); or it can be an access node (Access Point, AP) in a Wi-Fi system; or it can be a wireless relay node or a wireless backhaul node; or it can be a device that implements a base station function in the Internet of Things, a device that implements a base station function in V2X, a device that implements a base station function in D2D, or a device that implements a base station function in M2M, and this application does not limit this.

[0046] Among them, the terminal can also be called user equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, wireless communication equipment, user agent or user device, etc., and this application does not limit this.

[0047] In an exemplary embodiment, Figure 3 As shown, an inter-satellite handover method is provided. This embodiment takes the method applied to a source base station 102 on a first satellite as an example for description, and includes the following steps:

[0048] Step S202: determine an inter-satellite handover area, group terminals in the inter-satellite handover area, and obtain a terminal group.

[0049] The first satellite may be a satellite carrying the source base station 102. The inter-satellite switching area may be a ground area where the serving base station needs to be switched. The terminal group may be a set of one or more terminals.

[0050] In a specific implementation, the source base station 102 may determine the inter-satellite handover area according to the communication scenario, and group the terminals in the inter-satellite handover area to obtain at least one terminal group.

[0051] In actual applications, NTN communication scenarios can include Earth Moving Cell scenarios and Earth Fixed Cell scenarios. The Earth Moving Cell scenario refers to the continuous movement of the cell coverage on the earth as the satellite moves. This scenario can be achieved by keeping the satellite beam direction unchanged. The Earth Fixed Cell scenario refers to the cell coverage being able to be fixed at a certain position on the earth permanently or for a certain period of time. This scenario can be achieved by making the satellite beam direction variable. The cell coverage being fixed at a certain position for a certain period of time is called the Earth Semi-Fixed Cell scenario.

[0052] In the Earth Mobile Cell scenario, the satellite beam direction remains unchanged. Assume that the coverage range of the source base station S-gNB1 and the target base station S-gNB2 at the current moment is as follows: Figure 1 As shown, the shaded part represents the overlapping area between the coverage areas. As the first satellite moves, S-gNB1 gradually fails to cover the overlapping area, and the overlapping area needs to be handed over to S-gNB2 for service. At this time, the overlapping area is the inter-satellite switching area.

[0053] In the Earth semi-fixed cell scenario, the satellite beam direction can change and cover the same area for a period of time. Assume that the coverage of S-gNB1 and S-gNB2 at the current moment is as follows: Figure 2 As shown in the figure, the shaded part represents the coverage of S-gNB1 at the current moment. As the first satellite moves, S-gNB2 will change the beam direction at a certain moment and take over the service of S-gNB1 for the shaded part. Figure 2 The shaded area in the figure is the inter-satellite switching area.

[0054] After determining the inter-satellite handover area, S-gNB1 can group all terminals in the inter-satellite handover area according to the wave position or synchronization signal block (SSB) to obtain one or more terminal groups.

[0055] Step S204 , sending a handover request message corresponding to the terminal group to the target base station 104 .

[0056] The switching request message may be a message requesting switching of a serving base station of a terminal group.

[0057] In a specific implementation, the source base station 102 may generate a handover request message corresponding to each terminal group, and send the handover request message to the target base station 104. The target base station 104 receives at least one handover request message.

[0058] In actual applications, S-gNB1 can generate a handover request list for each terminal in a terminal group. The handover request list contains the information elements involved in the original handover request of each terminal in the terminal group, such as the terminal context information (UE Context Information), terminal history information (UE History Information), S-NG-RAN node terminal context reference (UE Context Reference at the S-NG-RAN node), conditional handover information request (Conditional Handover Information Request), etc. in the original handover request (HANDOVERREQUEST). Among them, the original handover request refers to the handover request sent when the terminal is not grouped. S-gNB1 can send the handover request list to S-gNB2.

[0059] Step S206 , according to the handover request response returned by the target base station 104 , the terminal groups are handed over from the source base station 102 to the target base station 104 in groups.

[0060] The handover request response may be a response message of the target base station 104 allowing or rejecting handover of the terminal group.

[0061] In a specific implementation, if the target base station 104 returns a switching request response to the switching request message that allows switching, the source base station 102 can switch each terminal in the corresponding terminal group from the source base station 102 to the target base station 104 on a terminal group basis; otherwise, if the target base station 104 returns a switching request response to the switching request message that refuses switching, each terminal in the corresponding terminal group cannot be switched from the source base station 102 to the target base station 104.

[0062] In actual applications, S-gNB2 can generate a handover request response list based on the received handover request list, and the handover request response list contains information related to the original handover request response of each terminal in the terminal group, for example, all information elements except the information type (Message Type) in the original handover request response (HANDOVER REQUEST ACKNOWLEDGE), where the original handover request response refers to the handover request response when the terminal is not grouped. It can be understood that S-gNB2 can return a handover request response list carrying a handover permission message when it can provide services to all terminals in the current terminal group, and return a handover request response list carrying a handover rejection message when the performance is poor and it cannot provide services to all terminals in the current terminal group.

[0063] The above-mentioned inter-satellite switching method determines the inter-satellite switching area, groups the terminals in the inter-satellite switching area, obtains the terminal group, sends the switching request message corresponding to the terminal group to the target base station, and switches the terminal group from the source base station to the target base station according to the switching request response returned by the target base station; the terminals in the inter-satellite switching area can be grouped, and multiple terminals in the group can be interactively switched at one time to reduce the amount of signaling generated during the switching process, thereby avoiding signaling congestion when accessing the target base station.

[0064] In an exemplary embodiment, the above-mentioned inter-satellite switching method may further specifically include: broadcasting system information carrying delay parameters; when the terminal in the terminal group receives the switching instruction from the source base station, the terminal randomly determines the switching delay according to the delay parameters in the system information, and switches to the target base station according to the switching delay.

[0065] The delay parameter may be, but is not limited to, a maximum delay for a terminal to perform inter-satellite handover. The handover delay may be a delay for a terminal to perform inter-satellite handover. The system information may be a system information block (System Information Block), including but not limited to SIB 19.

[0066] In a specific implementation, the source base station may broadcast system information carrying delay parameters to the terminals within the coverage area in advance. After the target base station returns a switching request response allowing the switching, the source base station may send a switching instruction to the terminals in the terminal group. When receiving the switching instruction, the terminals in the terminal group may determine the delay interval according to the delay parameters in the system information, randomly select the switching delay within the delay interval, and switch to the target base station according to the selected switching delay.

[0067] Furthermore, the terminal can obtain SIB19 from the broadcast message of S-gNB1. SIB19 can include a delay parameter: HO delta parameter field. The HO delta parameter value is a specific time length in ms. For a terminal group, each terminal in it can The switching delay (HO delay) is randomly selected in the interval. After receiving the switching command from S-gNB1, it waits for the HO delay time and then completes the uplink and downlink synchronization and random access with S-gNB2 to achieve group switching of the terminal group. It should be noted that the switching delays of different terminals in the same terminal group may be different.

[0068] In this embodiment, by broadcasting system information carrying delay parameters, the switching timing of each terminal in the terminal group can be randomized, thereby avoiding simultaneous switching of all terminals in the terminal group and effectively preventing access congestion to the target base station.

[0069] In an exemplary embodiment, the above step S202 may specifically include: determining the inter-satellite switching area according to the inter-satellite switching scenario; the inter-satellite switching scenario includes an earth mobile cell scenario or an earth semi-fixed cell scenario; and grouping the terminals in the inter-satellite switching area according to the wave position or synchronization signal block corresponding to the terminal to obtain a terminal group.

[0070] The inter-satellite handover scenario includes but is not limited to a terrestrial mobile cell scenario or a terrestrial semi-fixed cell scenario. The wave position may refer to the wave position to which the terminal belongs under the source base station. The synchronization signal block may refer to the synchronization signal block sent by the source base station and received by the terminal.

[0071] In a specific implementation, the source base station may determine the inter-satellite handover area for different inter-satellite handover scenarios, and group the terminals in the inter-satellite handover area corresponding to the same wave position or the same SSB into one group to obtain one or more terminal groups.

[0072] For example, refer to Figure 1 In the scenario of earth mobile cells, the intersatellite handover area shown in the shaded part can be determined, and S-gNB1 can divide the terminals under the same wave position into a group to obtain terminal groups A and B. Similarly, refer to Figure 2 , in the earth semi-fixed cell scenario, S-gNB1 can determine terminal groups A, B, C, D and E.

[0073] In this embodiment, the inter-satellite switching area is determined according to the inter-satellite switching scenario, and the terminals in the inter-satellite switching area are grouped according to the wave position or synchronization signal block corresponding to the terminal to obtain a terminal group. The terminals in the inter-satellite switching area can be switched by wave position group or by SSB group, thereby reducing the amount of signaling generated during the switching process, thereby reducing the network burden and improving the utilization efficiency of network resources.

[0074] In an exemplary embodiment, the handover request message includes a handover request list of each terminal in the terminal group, and the handover request response includes a request response list of each terminal in the terminal group.

[0075] The switching request list may be a list of switching request messages of each terminal in the terminal group, and the request response list may be a list of switching request response messages of each terminal in the terminal group.

[0076] In a specific implementation, the source base station may generate a handover request list for each terminal in a terminal group, where the handover request list includes information elements involved in the original handover request of each terminal in the terminal group, for example, UE Context Information, UE History Information, UE Context Reference at the S-NG-RAN node, Conditional Handover Information Request, etc. in the original HANDOVER REQUEST, wherein the original handover request refers to a handover request sent when the terminal is not grouped, and the source base station may send the handover request list to the target base station.

[0077] The target base station can generate a handover request response list based on the received handover request list, where the handover request response list contains information related to the original handover request response of each terminal in the terminal group, for example, all information elements except Message Type in the original HANDOVERREQUEST ACKNOWLEDGE, where the original handover request response refers to the handover request response when the terminal is not grouped.

[0078] In this embodiment, the switching request message includes a switching request list of each terminal in the terminal group, and the switching request response includes a request response list of each terminal in the terminal group. Therefore, information of all terminals in the terminal group can be exchanged between the source base station and the target base station to ensure reliable switching of the terminal group.

[0079] In an exemplary embodiment, when the handover request response includes a random access-free configuration, the target base station performs uplink authorization for the terminal group according to pre-allocated or dynamically scheduled uplink authorization information.

[0080] The random access channel-less (RACH-less) configuration may be a configuration message that does not require random access during the handover process. The uplink grant (UL grant) information may be information indicating uplink data transmission.

[0081] In a specific implementation, the target base station may include a random access-free configuration in a handover request response. At this time, the target base station may control each terminal in the terminal group to perform uplink transmission according to the pre-allocated uplink authorization information. Alternatively, the target base station may dynamically schedule uplink authorization after downlink synchronization, and send uplink authorization information to each terminal in the terminal group through a physical downlink control channel (PDCCH).

[0082] In this embodiment, when the handover request response includes a random access-free configuration, the target base station performs uplink authorization on the terminal group according to the pre-allocated or dynamically scheduled uplink authorization information, thereby achieving random access-free under group handover and improving the efficiency of group handover.

[0083] In an exemplary embodiment, when the system information also carries a resynchronization configuration, the target base station resynchronizes the terminal group according to the cell configuration of the source base station.

[0084] The resynchronization configuration may be configuration information indicating resynchronization after group switching. The cell configuration includes but is not limited to SSB, SIB, paging, and terminal radio resource control (RRC) configuration.

[0085] In a specific implementation, the system information broadcast by the source base station may also carry a resynchronization configuration, and the target base station may make the cell configuration after switching the terminals in the same terminal group the same as the cell configuration of the source base station before switching. The system information may be, but is not limited to, SIB19.

[0086] In this embodiment, when the system information also carries the resynchronization configuration, the target base station resynchronizes the terminal group according to the cell configuration of the source base station, so that the cell configuration before and after the terminal switching can be kept unchanged, thereby reducing or avoiding the signaling overhead of performing traditional layer 3 (L3) switching.

[0087] In an exemplary embodiment, Figure 4 As shown, an inter-satellite handover method is provided. This embodiment takes the method applied to a target base station 104 on a second satellite as an example for description, and includes the following steps:

[0088] Step S302, receiving a handover request message sent by a source base station; the handover request message corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0089] Step S304: returning a handover request response to the source base station according to the handover request message, so that the source base station switches the terminal groups from the source base station to the target base station according to the handover request response.

[0090] The second satellite may be a satellite carrying a target base station.

[0091] In a specific implementation, the source base station can determine the inter-satellite switching area according to the inter-satellite switching scenario, group the terminals in the inter-satellite switching area, and obtain at least one terminal group. The source base station can send a switching request message corresponding to the terminal group to the target base station, and the target base station returns a switching request response to the source base station. The source base station generates a switching instruction based on the switching request response and sends it to the terminal. The terminal switches to the target base station as a group with other terminals in the same terminal group based on the received switching instruction.

[0092] The above-mentioned inter-satellite switching method receives a switching request message sent by a source base station, and returns a switching request response to the source base station according to the switching request message; the terminals in the inter-satellite switching area can be grouped, and multiple terminals in the group can be interactively switched at one time to reduce the amount of signaling generated during the switching process, thereby avoiding signaling congestion when accessing the target base station.

[0093] In an exemplary embodiment, the above-mentioned inter-satellite handover method may further specifically include: when the handover request response includes a random access-free configuration, performing uplink authorization on the terminal group according to pre-allocated or dynamically scheduled uplink authorization information.

[0094] In a specific implementation, the target base station may include a random access-free configuration in the switching request response. At this time, the target base station may control each terminal in the terminal group to perform uplink transmission according to the pre-allocated uplink authorization information. Alternatively, the target base station may dynamically schedule uplink authorization after downlink synchronization, and send uplink authorization information to each terminal in the terminal group through PDCCH.

[0095] In this embodiment, when the handover request response includes a random access-free configuration, uplink authorization is performed on the terminal group according to pre-allocated or dynamically scheduled uplink authorization information, thereby achieving random access-free under group handover and improving the efficiency of group handover.

[0096] In an exemplary embodiment, the above inter-satellite handover method may further specifically include: when the system information broadcast by the source base station carries a resynchronization configuration, resynchronizing the terminal group according to the cell configuration of the source base station.

[0097] In a specific implementation, the system information broadcast by the source base station may also carry a resynchronization configuration, and the target base station may make the cell configuration after switching the terminals in the same terminal group the same as the cell configuration of the source base station before switching. The system information may be, but is not limited to, SIB19.

[0098] In this embodiment, when the system information broadcast by the source base station carries the resynchronization configuration, the terminal group is resynchronized according to the cell configuration of the source base station, so that the cell configuration before and after the terminal switching can be kept unchanged, thereby reducing or avoiding the signaling overhead of performing traditional L3 switching.

[0099] In an exemplary embodiment, Figure 5 As shown, an inter-satellite handover method is provided. This embodiment takes the method applied to the terminal 106 as an example for description, and includes the following steps:

[0100] Step S402, receiving a handover instruction sent by a source base station; the handover instruction corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0101] Step S404: According to the switching instruction, other terminals in the same terminal group are switched from the source base station to the target base station as a group.

[0102] In a specific implementation, the source base station can determine the inter-satellite switching area according to the inter-satellite switching scenario, group the terminals in the inter-satellite switching area, and obtain at least one terminal group. The source base station can send a switching request message corresponding to the terminal group to the target base station, and the target base station returns a switching request response to the source base station. The source base station generates a switching instruction based on the switching request response and sends it to the terminal. The terminal switches to the target base station as a group with other terminals in the same terminal group based on the received switching instruction.

[0103] The above-mentioned inter-satellite switching method receives a switching instruction sent by a source base station, and according to the switching instruction, switches from the source base station to the target base station in groups with other terminals in the same terminal group; the terminals in the inter-satellite switching area can be grouped, and multiple terminals in the group can be interactively switched at one time to reduce the amount of signaling generated during the switching process, thereby avoiding signaling congestion when accessing the target base station.

[0104] In an exemplary embodiment, the above step S404 may specifically include: when a switching instruction is received, obtaining a delay parameter from system information broadcast by a source base station; randomly determining a switching delay based on the delay parameter; and switching from the source base station to the target base station based on the switching delay.

[0105] In a specific implementation, the source base station may broadcast system information carrying delay parameters to the terminals within the coverage area in advance. After the target base station returns a handover request response permitting the handover, the source base station may send a handover instruction to each terminal in the terminal group. Upon receiving the handover instruction, each terminal in the terminal group may determine the delay interval according to the delay parameter in the system information, randomly select the handover delay within the delay interval, and switch to the target base station according to the selected handover delay. The system information may be, but is not limited to, SIB19.

[0106] In this embodiment, when a switching instruction is received, a delay parameter is obtained from the system information broadcast by the source base station, and the switching delay is randomly determined based on the delay parameter. Based on the switching delay, the source base station is switched to the target base station. This can achieve randomization of the switching timing of each terminal in the terminal group, avoid all terminals in the terminal group from switching at the same time, and effectively prevent access congestion to the target base station.

[0107] In an exemplary embodiment, Figure 6 As shown, an inter-satellite handover method is provided, comprising the following steps:

[0108] Step S501: The source base station determines an inter-satellite handover area, groups the terminals in the inter-satellite handover area to obtain a terminal group, and sends a handover request message corresponding to the terminal group to the target base station;

[0109] Step S502: the target base station returns a handover request response corresponding to the terminal group to the source base station according to the received handover request message;

[0110] Step S503: the source base station generates a handover instruction corresponding to the terminal group according to the received handover request response, and sends it to the terminal;

[0111] Step S504: The terminal switches from the source base station to the target base station together with other terminals in the same terminal group according to the received switching instruction.

[0112] In a specific implementation, the source base station can determine the inter-satellite switching area according to the inter-satellite switching scenario, group the terminals in the inter-satellite switching area, and obtain at least one terminal group. The source base station can send a switching request message corresponding to the terminal group to the target base station, and the target base station returns a switching request response corresponding to the terminal group. The source base station generates a switching instruction corresponding to the terminal group based on the switching request response and sends it to the terminal. The terminal switches to the target base station as a group with other terminals in the same terminal group based on the received switching instruction.

[0113] The above-mentioned inter-satellite switching method determines the inter-satellite switching area through the source base station, groups the terminals in the inter-satellite switching area to obtain a terminal group, sends a switching request message corresponding to the terminal group to the target base station, and the target base station returns a switching request response corresponding to the terminal group to the source base station based on the received switching request message. The source base station generates a switching instruction corresponding to the terminal group based on the received switching request response and sends it to the terminal. The terminal switches from the source base station to the target base station as a group with other terminals in the same terminal group based on the received switching instruction. The terminals in the inter-satellite switching area can be grouped, and multiple terminals in the group can be interactively switched at one time to reduce the amount of signaling generated during the switching process and avoid signaling congestion when accessing the target base station.

[0114] In order to facilitate those skilled in the art to have a deeper understanding of the embodiments of the present application, a specific example will be described below.

[0115] This application aims to solve the problems caused by cell switching triggered by satellite movement in non-terrestrial communication scenarios, especially the "signaling storm" and target gNB access congestion problems that may be caused by concentrated switching of a large number of UEs, so as to reduce the signaling overhead of inter-satellite switching and improve the switching efficiency. To this end, this application introduces a group-based inter-satellite switching method in the NTN scenario, including group switching by wave position or group switching by synchronization signal block to reduce the number of switching signaling; in addition, the HO delta parameter is introduced in the system information block SIB19 to randomize the UE switching timing and avoid access congestion caused by the simultaneous switching of a large number of UEs to the target gNB. In addition, group-based inter-satellite switching can be further combined with RACH less switching and resynchronization satellite switching to achieve higher switching efficiency.

[0116] In one embodiment, a satellite switching implementation method is provided, including the following contents:

[0117] 1. In the HANDOVER REQUEST message, the handover request of a single UE is changed to the handover request of multiple UEs at the same time according to the UE list, reducing the Xn interface messages; similarly, the HANDOVER REQUEST ACKNOWLEDGE message is also transmitted according to the UE list.

[0118] That is, a new information element Handover UE List is added to HANDOVER REQUEST, which includes multiple UE List information elements. In each UE List, all information elements related to UE handover in the original HANDOVER REQUEST are included, such as UE ContextInformation, UE History Information, UE Context Reference at the S-NG-RAN node, Conditional Handover Information Request, etc. A new information element HandoverAck UE List is added to HANDOVER REQUEST ACKNOWLEDGE, which includes multiple UE Ack List information elements. In each UE Ack List, all information elements except Message Type in the original HANDOVER REQUEST ACKNOWLEDGE are included.

[0119] By switching in groups, that is, switching by wave group or by SSB group, the amount of signaling generated during the switching process can be significantly reduced, which helps to reduce the network burden and improve the utilization efficiency of network resources.

[0120] 2. To prevent a large number of UEs from causing access congestion to the target gNB due to handover, the HO delta parameter is introduced in SIB19. The value is the time interval in ms. In the closed set of , the HO delay is randomly selected, and the UE needs to wait for the HO delay time before executing the handover, so as to randomize the handover timing of UEs in the same group.

[0121] By introducing the HO delta parameter in SIB19, the UE switching timing is randomized, which can avoid a large number of UEs from switching at the same time and effectively prevent access congestion to the target gNB.

[0122] 3. Group-based inter-satellite switching can be combined with RACH less switching and resynchronized satellite switching to further reduce the signaling overhead of the switching process and improve the efficiency of the switching process.

[0123] It should be noted that the original HANDOVER REQUEST and the original HANDOVER REQUESTACKNOWLEDGE mentioned in this application refer to the HANDOVER REQUEST and HANDOVER REQUESTACKNOWLEDGE given in 3GPP TS 38.423.

[0124] In one embodiment, Figure 7 As shown, a method for implementing group-based inter-satellite switching is provided, comprising the following steps:

[0125] Step S602: For UEs in the inter-satellite handover area, the source gNB groups them by wave position or SSB.

[0126] Specifically, we first need to determine the intersatellite handover area, refer to Figure 1 and Figure 2 .

[0127] Figure 1 For the earth mobile cell scenario, the satellite's beam direction remains unchanged, so the area covered by S-gNB1 and S-gNB2 is changing all the time. UEs in the overlapping coverage area of ​​S-gNB1 and S-gNB2 need to perform inter-satellite handover, and the overlapping coverage area is called the inter-satellite handover area.

[0128] Figure 2In the semi-fixed cell scenario, the satellite beam covers the same area for a period of time. At the current moment, S-gNB1 and S-gNB2 are responsible for serving different areas. At a later moment, as the satellite moves, S-gNB2 will change the beam direction and take over the area served by S-gNB1. Therefore, UEs in the area covered by S-gNB1 need to perform inter-satellite handover, which is called the inter-satellite handover area.

[0129] For the inter-satellite handover area of ​​earth mobile cells and earth semi-fixed cells, the source gNB can divide UEs into different groups according to different SSBs; or classify UEs with the same SSB into the same group.

[0130] Step S604: The source gNB and the target gNB transmit the switching request and response in groups.

[0131] Specifically, according to the result of grouping the UE, the source gNB includes the Handover UE List (handover request list) information element in the HANDOVER REQUEST message (handover request signaling) sent to the target gNB; the Handover UE List includes the UE List (handover request for terminals in the group) information element of the UEs in the same group; the UE List of a single UE includes all the information elements related to UE handover in the original HANDOVER REQUEST. Similarly, the target gNB includes the information element HandoverAck UEList (request response list) in the HANDOVER REQUEST ACKNOWLEDGE message (handover request response signaling) sent to the source gNB, which includes the UE Ack List (handover request response for terminals in the group) information element corresponding to the UE List in the HANDOVER REQUEST, and each UE Ack List includes all the information elements in the original HANDOVER REQUESTACKNOWLEDGE except Message Type. Figure 8 As shown, in the signaling process of switching, the switching request signaling and switching request response signaling of the source gNB and the target gNB are transmitted in groups in the form of a list.

[0132] Step S606: After receiving the handover command, the UE obtains the HO delay according to SIB19, and performs uplink and downlink synchronization and access after waiting for the HO delay.

[0133] Specifically, since the propagation delays of UEs in the same group (i.e., the same wave position or the same SSB) to the source gNB and the target gNB are not much different, if the handover request is received and the handover is performed directly, it may cause access congestion to the target gNB. Therefore, for the handover of a large number of UEs, it is necessary to randomize the handover timing. Specifically, the UE obtains SIB19 from the broadcast message of the source gNB, which contains the HO delta field, which takes a specific time length in ms. The UE randomly takes the HO delay value in the interval [0, HO delta]. After receiving the handover command, it waits for the HO delay time and then completes the uplink and downlink synchronization and random access with the target gNB to complete the handover from the UE to the target gNB. Please refer to Figure 8 The HO delta value is determined by the source gNB. When there are fewer UEs in the same group, the HO delta value can be a smaller value or 0.

[0134] In one embodiment, a method for implementing group-based inter-satellite handover based on RACH less handover is provided, comprising the following steps:

[0135] Step S612: For UEs in the inter-satellite handover area, the source gNB groups them by wave position or SSB.

[0136] This is consistent with the switching between satellites by group.

[0137] Step S614: The source gNB and the target gNB transmit the switching request and response in groups.

[0138] Specifically, as in the case of group-based intersatellite handover, the source gNB includes the Handover UE List IE in the HANDOVER REQUEST message sent to the target gNB, and the target gNB includes the HandoverAck UE List IE in the HANDOVER REQUEST ACKNOWLEDGE message sent to the source gNB. In addition, the target gNB includes the RACH-less handover configuration in the HANDOVER REQUEST ACKNOWLEDGE message, and may select a pre-allocated configuration grant for the first uplink transmission. If the configuration of the target gNB does not include a configuration grant, the target gNB may also dynamically schedule an uplink grant after downlink synchronization, and the UE receives the uplink grant through the PDCCH of the target gNB.

[0139] Step S616: After receiving the handover command, the UE obtains the HO delay according to SIB19, and performs uplink and downlink synchronization and access after waiting for the HO delay.

[0140] Specifically, as with the implementation of group-based intersatellite handover, the UE obtains SIB19 from the source gNB's broadcast message, which contains the HO delta field, which is a specific time length in ms. The UE randomly selects the HO delay value in the interval [0, HO delta], and waits for the HO delay time after receiving the handover command. The UE performs downlink synchronization and uses the pre-allocated configuration grant or the obtained dynamic grant to send the first uplink transmission to the target gNB to complete the reconfiguration and implement RACH less handover. For more information, refer to Fig. 9 On the basis of group-based inter-satellite handover, by skipping the RACH process in the handover, the signaling interaction of the handover is further reduced, and the overhead of the target gNB allocating random access resources for the UE is reduced.

[0141] In one embodiment, a method for implementing group-based inter-satellite handover based on resynchronization satellite handover is provided, comprising the following steps:

[0142] Step S622: For UEs in the inter-satellite handover area, the source gNB groups them by wave position or SSB.

[0143] This is consistent with the switching between satellites by group.

[0144] Step S624: The source gNB and the target gNB transmit the switching request and response in groups.

[0145] This is consistent with the switching between satellites by group.

[0146] Step S626: After receiving the handover command, the UE obtains the HO delay according to SIB19, and performs uplink and downlink synchronization and access after waiting for the HO delay.

[0147] Specifically, the UE obtains SIB19 from the broadcast message of the source gNB, which includes SatSwitchWithReSync-r18 (resynchronization configuration) and HO delta. For SatSwitchWithReSync-r18, it includes the time offset between the SSBs of the source gNB and the target gNB, the service start time of the target gNB, and the configuration information of the target gNB. For HO delta, the value is a specific time length in ms. The UE randomly selects the HO delay value in the interval [0, HO delta]. After receiving the handover command, it waits for the HO delay time before switching. For details, refer to Fig.10. During the switching process, the source gNB and the target gNB ensure the consistency of security keys through inter-satellite coordination, and the target gNB prepares resources in advance by group to ensure that the cell configuration (such as SSB, SIB, paging and UE's RRC configuration) of UEs in the same group remains unchanged before and after the switching, and the Access and Mobility Management Function (AMF) / User Port Function (UPF) does not need to perform path switching. Therefore, the inter-satellite switching by group based on resynchronized satellite switching can reduce or avoid the signaling overhead of performing traditional L3 switching by keeping the cell configuration of UEs unchanged before and after the switching. In addition, the inter-satellite switching by group based on resynchronized satellite switching can be further combined with RACH less switching (such as Fig.10 uplink synchronization), thereby skipping the RACH process and further improving the switching efficiency.

[0148] It should be understood that, although the various steps in the flowcharts involved in the above-mentioned embodiments are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps does not have a strict order restriction, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowcharts involved in the above-mentioned embodiments can include multiple steps or multiple stages, and these steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the steps or stages in other steps.

[0149] Based on the same inventive concept, the embodiment of the present application also provides an inter-satellite switching device for implementing the inter-satellite switching method involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more inter-satellite switching device embodiments provided below can refer to the above limitations on the inter-satellite switching method, and will not be repeated here.

[0150] In an exemplary embodiment, an inter-satellite switching device is provided, comprising:

[0151] A terminal grouping module, used to determine an inter-satellite handover area, and group terminals in the inter-satellite handover area to obtain a terminal group;

[0152] A request sending module, used to send a handover request message corresponding to the terminal group to the target base station;

[0153] The switching indication module is used to switch the terminal groups from the source base station to the target base station according to the switching request response returned by the target base station.

[0154] In an exemplary embodiment, the above-mentioned inter-satellite switching device also includes a broadcast module for broadcasting system information carrying delay parameters; when the terminal in the terminal group receives the switching instruction from the source base station, it randomly determines the switching delay according to the delay parameters in the system information, and switches to the target base station according to the switching delay.

[0155] In an exemplary embodiment, the terminal grouping module is further used to determine the inter-satellite switching area according to the inter-satellite switching scenario; the inter-satellite switching scenario includes an earth mobile cell scenario or an earth semi-fixed cell scenario; and the terminals in the inter-satellite switching area are grouped according to the wave position or synchronization signal block corresponding to the terminal to obtain the terminal group.

[0156] In an exemplary embodiment, the handover request message includes a handover request list of each terminal in the terminal group, and the handover request response includes a request response list of each terminal in the terminal group.

[0157] In an exemplary embodiment, when the handover request response includes a random access-free configuration, the target base station performs uplink authorization for the terminal group according to pre-allocated or dynamically scheduled uplink authorization information.

[0158] In an exemplary embodiment, when the system information also carries a resynchronization configuration, the target base station resynchronizes the terminal group according to the cell configuration of the source base station.

[0159] In an exemplary embodiment, another inter-satellite switching device is provided, comprising:

[0160] A request receiving module, configured to receive a handover request message sent by a source base station; the handover request message corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0161] The response sending module is used to return a switching request response to the source base station according to the switching request message, so that the source base station switches the terminal groups from the source base station to the target base station according to the switching request response.

[0162] In an exemplary embodiment, the above-mentioned inter-satellite switching device further includes a random access-free module, which is used to perform uplink authorization on the terminal group according to pre-allocated or dynamically scheduled uplink authorization information when the switching request response contains a random access-free configuration.

[0163] In an exemplary embodiment, the above-mentioned inter-satellite switching device further includes a resynchronization module, which is used to resynchronize the terminal group according to the cell configuration of the source base station when the system information broadcast by the source base station carries a resynchronization configuration.

[0164] In an exemplary embodiment, another inter-satellite switching device is provided, comprising:

[0165] An instruction receiving module, configured to receive a handover instruction sent by a source base station; the handover instruction corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area;

[0166] The inter-satellite switching module is used to switch from the source base station to the target base station in groups with other terminals in the same terminal group according to the switching instruction.

[0167] In an exemplary embodiment, the above-mentioned inter-satellite switching module is also used to obtain a delay parameter from the system information block SIB19 broadcast by the source base station when receiving the switching instruction; randomly determine the switching delay according to the delay parameter; and switch from the source base station to the target base station according to the switching delay.

[0168] Each module in the above-mentioned intersatellite switching device can be implemented in whole or in part by software, hardware or a combination thereof. Each of the above-mentioned modules can be embedded in or independent of the processor in the communication device in the form of hardware, or can be stored in the memory in the communication device in the form of software, so that the processor can call and execute the corresponding operations of each of the above modules.

[0169] In an exemplary embodiment, a communication device is provided, which may be a base station. The communication device includes a processor, a memory, an input / output interface (I / O for short) and a communication interface. The processor, the memory and the input / output interface are connected via a system bus, and the communication interface is connected to the system bus via the input / output interface. The processor of the communication device is used to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the communication device is used to store inter-satellite switching data. The input / output interface of the communication device is used to exchange information between the processor and an external device. The communication interface of the communication device is used to communicate with an external terminal via a network connection. When the computer program is executed by the processor, an inter-satellite switching method is implemented.

[0170] In an exemplary embodiment, a communication device is provided, which may be a terminal. The communication device includes a processor, a memory, an input / output interface, a communication interface, a display unit, and an input device. The processor, the memory, and the input / output interface are connected via a system bus, and the communication interface, the display unit, and the input device are connected to the system bus via the input / output interface. The processor of the communication device is used to provide computing and control capabilities. The memory of the communication device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The input / output interface of the communication device is used to exchange information between the processor and an external device. The communication interface of the communication device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be implemented through WIFI, a mobile cellular network, near field communication (NFC) or other technologies. When the computer program is executed by the processor, an inter-satellite switching method is implemented. The display unit of the communication device is used to form a visually visible picture, which may be a display screen, a projection device, or a virtual reality imaging device. The display screen can be a liquid crystal display screen or an electronic ink display screen, and the input device of the communication device can be a touch layer covering the display screen, or a button, trackball or touchpad set on the communication device housing, or an external keyboard, touchpad or mouse.

[0171] Those skilled in the art will understand that the above structure is merely a block diagram of a partial structure related to the scheme of the present application, and does not constitute a limitation on the communication device to which the scheme of the present application is applied. The specific communication device may include more or fewer components than shown in the figure, or combine certain components, or have a different arrangement of components.

[0172] In one embodiment, a communication device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above method embodiments when executing the computer program.

[0173] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned method embodiments are implemented.

[0174] In one embodiment, a computer program product is provided, including a computer program, which implements the steps in the above method embodiments when executed by a processor.

[0175] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0176] A person of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile memory and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. As an illustration and not limitation, RAM can be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM). The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. Non-relational databases may include distributed databases based on blockchains, etc., but are not limited to this. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, an artificial intelligence (AI) processor, etc., but are not limited to this.

[0177] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this application.

[0178] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the present application. It should be noted that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An inter-satellite handover method, characterized in that: The method is applied to a source base station, comprising: Determine an inter-satellite handover area, and group terminals in the inter-satellite handover area to obtain a terminal group; Sending a handover request message corresponding to the terminal group to the target base station; According to the handover request response returned by the target base station, the terminal groups are handed over from the source base station to the target base station in groups.

2. The inter-satellite handover method according to claim 1, characterized in that: The method further comprises: Broadcasting system information carrying delay parameters; when receiving a switching instruction from the source base station, the terminals in the terminal group randomly determine the switching delay according to the delay parameters in the system information, and switch to the target base station according to the switching delay.

3. The inter-satellite handover method according to claim 1, characterized in that: The determining of the inter-satellite handover area and grouping the terminals in the inter-satellite handover area to obtain a terminal group includes: Determining the inter-satellite handover area according to an inter-satellite handover scenario; the inter-satellite handover scenario includes an earth mobile cell scenario or an earth semi-fixed cell scenario; The terminals in the inter-satellite handover area are grouped according to the wave positions or synchronization signal blocks corresponding to the terminals to obtain the terminal group.

4. The inter-satellite handover method according to claim 1, characterized in that: The handover request message includes a handover request list of each terminal in the terminal group, and the handover request response includes a request response list of each terminal in the terminal group.

5. The inter-satellite handover method according to claim 1, characterized in that: When the handover request response includes a random access-free configuration, the target base station performs uplink authorization for the terminal group according to pre-allocated or dynamically scheduled uplink authorization information.

6. The inter-satellite handover method according to claim 2, characterized in that: When the system information also carries a resynchronization configuration, the target base station resynchronizes the terminal group according to the cell configuration of the source base station.

7. An inter-satellite handover method, characterized in that: The method is applied to a target base station, comprising: receiving a handover request message sent by a source base station; the handover request message corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area; According to the handover request message, a handover request response is returned to the source base station, so that the source base station switches the terminal groups from the source base station to the target base station in groups according to the handover request response.

8. The inter-satellite handover method according to claim 7, characterized in that: The method further comprises: When the handover request response includes a random access-free configuration, uplink authorization is performed on the terminal group according to pre-allocated or dynamically scheduled uplink authorization information.

9. The inter-satellite handover method according to claim 7, characterized in that: The method further comprises: When the system information broadcast by the source base station carries the resynchronization configuration, the terminal group is resynchronized according to the cell configuration of the source base station.

10. An inter-satellite handover method, characterized in that: The method is applied to a terminal, comprising: receiving a handover instruction sent by a source base station; the handover instruction corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area; According to the switching instruction, other terminals in the same terminal group are switched from the source base station to the target base station as a group.

11. The inter-satellite handover method according to claim 10, characterized in that: The switching, according to the switching instruction, switching other terminals in the same terminal group from the source base station to the target base station as a group, comprises: When receiving the switching instruction, acquiring a delay parameter from the system information broadcast by the source base station; According to the delay parameter, randomly determine the switching delay; According to the switching delay, the source base station is switched to the target base station.

12. An inter-satellite switching device, characterized in that: The device is applied to a source base station, and includes: A terminal grouping module, used to determine an inter-satellite handover area, and group terminals in the inter-satellite handover area to obtain a terminal group; A request sending module, used to send a handover request message corresponding to the terminal group to the target base station; The switching indication module is used to switch the terminal groups from the source base station to the target base station according to the switching request response returned by the target base station.

13. An inter-satellite switching device, characterized in that: The device is applied to a target base station, and includes: A request receiving module, configured to receive a handover request message sent by a source base station; the handover request message corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area; The response sending module is used to return a switching request response to the source base station according to the switching request message, so that the source base station switches the terminal groups from the source base station to the target base station according to the switching request response.

14. An inter-satellite switching device, characterized in that: The device is applied to a terminal, and includes: An instruction receiving module, configured to receive a handover instruction sent by a source base station; the handover instruction corresponds to a terminal group obtained by the source base station grouping terminals in an inter-satellite handover area; The inter-satellite switching module is used to switch from the source base station to the target base station in groups with other terminals in the same terminal group according to the switching instruction.

15. A base station communication device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 6 or 7 to 9 are implemented.

16. A mobile communication device, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method according to claim 10 or 11 are implemented.

17. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6, or 7 to 9, or 10 to 11 are implemented.

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