Switching method, device, terminal and network equipment

Abstract

The present invention provides a switching method, device, terminal and network equipment. The method includes: The purpose of the technical solution of the present invention is to provide a switching method, device, terminal and network equipment, which is used to solve the problem that the existing cell switching method requires multiple interactions between the terminal UE, the source base station and the target base station to complete, and cannot adapt to high-speed mobile and large-delay satellite communication scenarios. The method can solve the problem that the existing cell switching method requires multiple interactions between the terminal UE, the source base station and the target base station to complete, and cannot adapt to high-speed mobile and large-delay satellite communication scenarios.

Description

Technical Field

[0001] The present invention relates to the field of wireless technology, and in particular to a switching method, device, terminal and network equipment. Background Art

[0002] For non-terrestrial networks (NTN), especially low-orbit satellites (LEO), the satellite movement speed is about 7.56 km / s, so switching occurs frequently. The traditional switching mechanism requires multiple interactions between the terminal UE, the source base station and the target base station to complete, which cannot adapt well to the satellite communication scenarios with high-speed movement and large latency. In addition, the frequent switching of terminals between cells also has large signaling overhead and leads to poor user experience. Summary of the invention

[0003] The purpose of the technical solution of the present invention is to provide a switching method, device, terminal and network equipment, which are used to solve the problem that the existing cell switching method requires multiple interactions between the terminal UE, the source base station and the target base station to complete, and cannot adapt to satellite communication scenarios with high-speed movement and large delay.

[0004] An embodiment of the present invention provides a switching method, which is applied to a terminal, wherein the method includes:

[0005] Receive at least one set of identical synchronization signals and physical broadcast channel blocks SSB respectively sent by at least two cells; the two cells are from two network nodes; wherein the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0006] An embodiment of the present invention further provides a handover method, which is applied to a first network node corresponding to a first cell, wherein the method includes:

[0007] When determining that the terminal needs to perform a cell change or before performing the cell change, sending configuration information of the terminal to a second network node corresponding to at least one second cell, where the second cell is a target cell for performing cell handover for the terminal;

[0008] After receiving confirmation information from the second network node, the context of the terminal is released.

[0009] An embodiment of the present invention further provides a handover method, which is applied to a second network node corresponding to a second cell, wherein the method includes:

[0010] receiving configuration information of a terminal sent by a first network node of a first cell;

[0011] In response to the configuration information, sending confirmation information to the first cell;

[0012] An access process of the terminal is executed.

[0013] An embodiment of the present invention further provides a switching method, which is applied to a terminal, and is characterized in that the method includes:

[0014] receiving first information for handover of the terminal sent by a first network node corresponding to the first cell;

[0015] The first information includes at least one kind of information:

[0016] Decision information for switching;

[0017] Information needed for switching;

[0018] Configuration information after switching;

[0019] According to the received first information for switching of the terminal, switching is performed to at least one second cell; wherein the second network node corresponding to the second cell is a neighboring node of the first network node corresponding to the first cell.

[0020] An embodiment of the present invention further provides a handover method, which is applied to a first network node corresponding to a first cell, wherein the method includes:

[0021] When it is determined that the terminal needs to change the cell or before the cell change is performed, sending second information for switching to a second network node corresponding to at least one second cell, wherein the second cell is a target cell for the terminal to perform cell switching;

[0022] receiving third information for handover sent by a second network node corresponding to at least one second cell;

[0023] Sending first information for switching to the terminal;

[0024] After receiving confirmation information of completion of the cell change sent by the second network node and / or the terminal or after the timer expires, the context of the terminal is released.

[0025] An embodiment of the present invention further provides a handover method, which is applied to a second network node corresponding to a second cell, wherein the method includes:

[0026] Receiving second information for handover of a terminal sent by a first network node corresponding to a first cell, wherein the first cell is a source cell of the terminal, and the second cell is a target cell for cell handover of the terminal;

[0027] sending third information for switching to the first network node according to the second information;

[0028] An access process of the terminal is executed.

[0029] An embodiment of the present invention further provides a terminal, including a transceiver, wherein the transceiver is used for:

[0030] Receive at least one set of identical synchronization signals and physical broadcast channel blocks SSB respectively sent by at least two cells; the two cells are from two network nodes; wherein the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0031] An embodiment of the present invention further provides a network device, applied to a first network node corresponding to a first cell, including a transceiver and a processor, wherein:

[0032] The transceiver is used to, when determining that the terminal needs to change the cell or before the cell change is performed, send the configuration information of the terminal to a second network node corresponding to at least one second cell, wherein the second cell is a target cell for the terminal to perform cell handover;

[0033] The processor is configured to release the context of the terminal after receiving confirmation information from the second network node.

[0034] An embodiment of the present invention further provides a network device, applied to a second network node corresponding to a second cell, including a transceiver and a processor, wherein:

[0035] The transceiver is used to receive configuration information of the terminal sent by the first cell; and

[0036] In response to the configuration information, sending confirmation information to the first cell;

[0037] The processor is used for executing an access process of the terminal.

[0038] An embodiment of the present invention further provides a terminal, including a transceiver and a processor, wherein the transceiver is used to:

[0039] receiving first information for handover of the terminal sent by a first network node corresponding to the first cell;

[0040] The first information includes at least one kind of information:

[0041] Decision information for switching;

[0042] Information needed for switching;

[0043] Configuration information after switching;

[0044] The processor is used for switching to at least one second cell according to the received first information for switching of the terminal; wherein the second network node corresponding to the second cell is a neighboring node of the first network node corresponding to the first cell.

[0045] An embodiment of the present invention further provides a network device, which is applied to a first network node corresponding to a first cell, and includes a transceiver and a processor:

[0046] The transceiver is used to send second information for switching to a second network node corresponding to at least one second cell when it is determined that the terminal needs to change the cell or before the cell is changed, wherein the second cell is a target cell for the terminal to switch the cell;

[0047] receiving third information for handover sent by a second network node corresponding to at least one second cell;

[0048] Sending first information for switching to the terminal;

[0049] The processor is configured to release the context of the terminal after receiving confirmation information of completion of the cell change sent by the second network node and / or the terminal or after a timer times out.

[0050] An embodiment of the present invention further provides a network device, which is applied to a second network node corresponding to a second cell, and includes a transceiver and a processor, wherein:

[0051] The transceiver is used to receive second information for handover of a terminal sent by a first network node corresponding to a first cell; wherein the first cell is a source cell of the terminal, and the second cell is a target cell for cell handover of the terminal;

[0052] sending third information for switching to the first network node according to the second information;

[0053] The processor is used for executing an access process of the terminal.

[0054] An embodiment of the present invention further provides a switching device, which is applied to a terminal, wherein the device includes:

[0055] A transceiver module is used to receive at least one set of identical synchronization signals and physical broadcast channel blocks (SSB) respectively sent by at least two cells; the two cells are from two network nodes; wherein the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0056] An embodiment of the present invention further provides a switching device, which is applied to a first network node corresponding to a first cell, wherein the device includes:

[0057] a sending module, configured to send the configuration information of the terminal to a second network node corresponding to at least one second cell when it is determined that the terminal needs to change the cell or before the cell change is performed, wherein the second cell is a target cell for the terminal to perform cell switching;

[0058] The processing module is used to release the context of the terminal after receiving the confirmation information from the second network node.

[0059] An embodiment of the present invention further provides a switching device, which is applied to a second network node corresponding to a second cell, wherein the device includes:

[0060] A configuration receiving module, used to receive configuration information of the terminal sent by the first cell;

[0061] A response module, configured to respond to the configuration information and send confirmation information to the first cell;

[0062] An execution module is used to execute the access process of the terminal.

[0063] An embodiment of the present invention further provides a switching device, which is applied to a terminal, wherein the device includes:

[0064] An information receiving module, configured to receive first information for handover of the terminal sent by a first network node corresponding to a first cell;

[0065] The first information includes at least one kind of information:

[0066] Decision information for switching;

[0067] Information needed for switching;

[0068] Configuration information after switching;

[0069] A switching module is used to switch to at least one second cell according to the first information for switching received from the terminal; wherein the second network node corresponding to the second cell is an adjacent node of the first network node corresponding to the first cell.

[0070] An embodiment of the present invention further provides a switching device, which is applied to a first network node corresponding to a first cell, wherein the device includes:

[0071] A first information sending module is configured to send second information for switching to a second network node corresponding to at least one second cell when it is determined that the terminal needs to change the cell or before the cell is changed, wherein the second cell is a target cell for the terminal to switch the cell;

[0072] An information receiving module, configured to receive third information for handover sent by a second network node corresponding to at least one second cell;

[0073] A second information sending module, used for sending first information for switching to the terminal;

[0074] The processing module is configured to release the context of the terminal after receiving confirmation information of completion of the cell change sent by the second network node and / or the terminal or after a timer times out.

[0075] An embodiment of the present invention further provides a switching device, which is applied to a second network node corresponding to a second cell, wherein the device includes:

[0076] An information receiving module, configured to receive second information for handover of a terminal sent by a first network node corresponding to a first cell; wherein the first cell is a source cell of the terminal, and the second cell is a target cell for cell handover of the terminal;

[0077] an information sending module, configured to send third information for switching to the first network node according to the second information;

[0078] A processing module is used to execute the access process of the terminal.

[0079] An embodiment of the present invention further provides a network device, which includes: a processor, a memory, and a program stored in the memory and executable on the processor, wherein the program implements any of the switching methods described above when executed by the processor.

[0080] An embodiment of the present invention further provides a readable storage medium, wherein a program is stored on the readable storage medium, and when the program is executed by a processor, the steps in the switching method as described in any one of the above items are implemented.

[0081] At least one of the above technical solutions of the present invention has the following beneficial effects:

[0082] In the switching method described in the embodiment of the present invention, the source node of the terminal and several adjacent nodes of the source node respectively send at least one set of SSB to form different virtual cells, and the source cell sends the terminal's switching-related configuration information to the target network node to which the terminal needs to switch in advance before predicting that the terminal needs to execute a cell change or making a cell change based on the terminal's location status information, so as to realize imperceptible switching of the terminal. BRIEF DESCRIPTION OF THE DRAWINGS

[0083] Figure 1 This is a flow chart of a switching method according to a first embodiment of the present invention;

[0084] Figure 2This is a flow chart of a switching method according to a second embodiment of the present invention;

[0085] Figure 3 A schematic diagram of a process of using the switching method described in an embodiment of the present invention;

[0086] Figure 4 This is a flow chart of a switching method according to a third embodiment of the present invention;

[0087] Figure 5 This is a flow chart of a switching method according to a fourth embodiment of the present invention;

[0088] Figure 6 This is a flowchart of a switching method according to a fifth embodiment of the present invention;

[0089] Figure 7 This is a flow chart of a switching method according to a sixth embodiment of the present invention;

[0090] Figure 8 This is a schematic diagram of the structure of a terminal according to implementation mode 1 of an embodiment of the present invention;

[0091] Fig. 9 This is a schematic diagram of the structure of a network device according to a first embodiment of the present invention;

[0092] Fig.10 This is a schematic diagram of the structure of a network device according to a second embodiment of the present invention;

[0093] Fig.11 This is a schematic diagram of the structure of a terminal according to implementation mode 2 of an embodiment of the present invention;

[0094] Fig.12 This is a schematic diagram of the structure of a network device according to implementation mode 3 of an embodiment of the present invention;

[0095] Fig.13 This is a schematic diagram of the structure of a network device according to a fourth embodiment of the present invention;

[0096] Fig.14 This is a schematic diagram of the structure of the switching device described in Implementation Method 1 of an embodiment of the present invention;

[0097] Fig.15 This is a schematic diagram of the structure of the switching device described in Implementation Method 2 of the embodiment of the present invention;

[0098] Fig.16 This is a schematic diagram of the structure of the switching device described in Implementation Method 3 of the embodiment of the present invention;

[0099] Fig.17 This is a schematic diagram of the structure of the switching device according to the fourth embodiment of the present invention;

[0100] Fig.18 This is a schematic diagram of the structure of the switching device described in Implementation Method 5 of the embodiment of the present invention;

[0101] Fig.19 This is a schematic diagram of the structure of the switching device according to the sixth embodiment of the present invention;

[0102] Fig. 20 The figure is a schematic diagram of the structure of the network device according to the embodiment of the present invention. DETAILED DESCRIPTION

[0103] In order to make the technical problems, technical solutions and advantages to be solved by the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0104] In order to solve the problem that the existing cell switching method requires multiple interactions between the terminal UE, the source base station and the target base station to complete, and cannot adapt to the satellite communication scenarios with high-speed movement and large delay, an embodiment of the present invention provides a switching method, in which the source node of the terminal and several adjacent nodes of the source node respectively send at least one set of synchronization signals and physical broadcast channel (Physical Broadcast Channe, PBCH) blocks (Synchronization Signal and PBCH block, SSB) to form different virtual cells, and the source cell sends the terminal's switching-related configuration information to the target network node to which the terminal needs to switch in advance before predicting that the terminal needs to execute a cell change or making a cell change based on the terminal's location status information, so as to realize the terminal's imperceptible switching.

[0105] A switching method according to one embodiment of the present invention is as follows: Figure 1 As shown, the switching method is applied to a terminal, comprising:

[0106] S110, receiving at least one set of identical synchronization signals and physical broadcast channel blocks SSB respectively sent by at least two cells; the two cells are from two network nodes; wherein the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0107] At least one set of the same SSB is sent by two cells located at different network nodes respectively to form different virtual cells, thereby improving the random access capacity and meeting the requirements of the terminal's imperceptible switching.

[0108] Optionally, in step S110, receiving at least one set of SSBs respectively sent by at least two cells includes:

[0109] At least one set of SSBs are received and respectively sent by at least two cells using at least partially identical physical cell identifiers (PCIs).

[0110] Among them, at least two cells use at least one PCI that is partially or completely the same to send at least one set of SSB.

[0111] In the embodiment of the present invention, optionally, in step S110, in the at least one set of SSBs received, different broadcast messages carried by each set of SSBs include different configuration information.

[0112] Optionally, each set of SSB corresponds to a set of time domain and / or frequency domain configuration information of the SSB, and different sets of SSB have different time domain and / or frequency domain configuration information. The time domain and / or frequency domain configuration information of the SSB includes at least one of a sending period, a starting position, a duration, a subcarrier position, and a subcarrier spacing.

[0113] Through the above method, the time domain and / or frequency domain configuration information of different sets of SSB is different, which can respectively correspond to the terminal of the first cell and the terminal of the second cell through seamless switching to meet the requirements of seamless switching.

[0114] Optionally, in another implementation, in step S110, receiving at least one set of SSBs respectively sent by at least two cells includes:

[0115] Within a preset time period, at least one set of the SSBs sent by at least two cells with different sending rules are received.

[0116] Optionally, when at least two cells send at least one set of the SSB in different sending orders, the SSBs sent by at least two cells at different time points and / or different frequency domain resources are different.

[0117] Using this implementation, optionally, at least two cells send different SSBs at different time points and / or different frequency domains (such as different PRB positions, different BWPs or different carrier members) within a preset duration T0 to form different virtual cells.

[0118] For example, one area may include satellite base stations 1, 2, 3, 4 and 5, and a set of SSBs sent include SSB1, SSB2, and SSB3; within the preset duration T0, at time t1, satellite base stations 1, 2 and 3 all send SSB1; satellite base stations 4, 5 and 6 all send SSB2; at time t2, satellite base stations 1 and 2 all send SSB3; satellite base stations 3 and 4 all send SSB1; satellite base stations 5 and 6 still send SSB2; or, at time t2, satellite base stations 1, 2 and 6 all send SSB3; satellite base stations 3 and 4 still send SSB2; optionally, the set of SSBs can be cyclically sent in a specific period according to the above rules, or the sending time and / or frequency domain resources of the set of SSBs can be updated in real time according to the changes in the user distribution of the area collected, so as to ensure that the terminal can achieve imperceptible interstellar switching within a certain area.

[0119] When this implementation method is adopted, when at least two cells send multiple sets of SSB respectively, the multiple sets of SSB configurations can effectively improve the system capacity by including different configuration contents. For example, each set of SSB configuration corresponds to a set of random access time and frequency resources, which can greatly improve the random access capacity. It is especially suitable for the situation where the satellite coverage area is large and the demand for random access capacity also increases accordingly.

[0120] Optionally, in one implementation manner of the switching method described in the embodiment of the present invention, the method further includes at least one of the following:

[0121] Periodically reporting the location status information of the terminal;

[0122] When a preset trigger condition is met, reporting the location status information of the terminal;

[0123] Reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[0124] Reporting a round trip time RTT from the terminal to the first network node and / or a round trip time (Round trip time, RTT) from the terminal to the second network node.

[0125] Optionally, the location status information includes at least one of the terminal's geographical location, moving direction and moving speed.

[0126] By acquiring the location status information of the terminal, the cell where the terminal is located can determine the neighboring cells according to the location status of the terminal and in combination with its own ephemeris information.

[0127] Optionally, the terminal may also trigger an event to report its own location status information, such as when the distance between the terminal and the first network node is greater than or equal to a first threshold, or when the distance between the terminal and the second network node is less than or equal to a second threshold. When at least one of the above conditions is met, the terminal may trigger the execution of its own location status information reporting; wherein, the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0128] By adopting the switching method described in the embodiment of the present invention, the location status information of the terminal is reported periodically and / or triggered to report when preset conditions are met, so that the source network node of the terminal can predict the cell change according to the location status information of the terminal, so as to be able to send the configuration information of the terminal to the network node to which the terminal needs to switch in advance, and the network node that receives the configuration information of the terminal can execute the access process of the terminal, thereby realizing interstellar switching without the terminal's perception.

[0129] Optionally, the switching method further comprises:

[0130] When the terminal switches from the first cell to the second cell, the switching timing is determined by at least one of the following methods:

[0131] The terminal randomly selects a time within a preset time range to access the second cell;

[0132] The terminal uses its own terminal identification and the parameters broadcast by the first cell to obtain a time within a preset time range to access the second cell;

[0133] The terminal uses the time information of the physical random access channel PRACH notified by the first cell and the preset time value to determine a time to access the second cell.

[0134] Another aspect of the present invention further provides a handover method, which is applied to a first network node corresponding to a first cell, such as Figure 2 As shown, the method includes:

[0135] S210, when it is determined that the terminal needs to change the cell or before the cell change is performed, send the configuration information of the terminal to a second network node corresponding to at least one second cell, where the second cell is a target cell for the terminal to perform cell switching;

[0136] S220: After receiving confirmation information from the second network node, release the context of the terminal.

[0137] By adopting the switching method described in this embodiment, when the terminal needs to change the cell or before the cell changes, the first network node of the first cell (that is, the source network node of the terminal) can send the configuration information of the terminal to the network node (second network node) where the terminal needs to switch the cell, so that the second network node that receives the configuration information of the terminal can execute the terminal's access, thereby realizing interstellar switching without the terminal's perception.

[0138] Optionally, the method further comprises:

[0139] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0140] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[0141] Optionally, in at least one set of synchronization signals and physical broadcast channel blocks SSB sent by the first cell and at least one second cell, different broadcast messages carried by each set of SSB include different configuration information.

[0142] Optionally, each set of SSB corresponds to a set of time domain and / or frequency domain configuration information of the SSB, and different sets of SSB have different time domain and / or frequency domain configuration information. The time domain and / or frequency domain configuration information of the SSB includes at least one of a sending period, a starting position, a duration, a subcarrier position, and a subcarrier spacing.

[0143] Optionally, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell use at least partially the same physical cell identifier to respectively send the SSB.

[0144] Through the above method, the time domain and / or frequency domain configuration information of different sets of SSB is different, which can respectively correspond to the terminal of the first cell and the terminal of the second cell through seamless switching to meet the requirements of seamless switching.

[0145] Optionally, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[0146] Optionally, the first cell and the second cell send different SSBs at different time points and / or different frequency domain resources.

[0147] With this implementation, optionally, the first cell and at least one second cell can respectively send multiple sets of SSBs; when sending multiple sets of SSBs, the multiple sets of SSB configurations can effectively improve the system capacity by including different configuration contents, for example, each set of SSB configurations corresponds to a set of random access time-frequency resources, which can greatly improve the random access capacity, especially suitable for the situation where the satellite coverage is large and the demand for random access capacity also increases accordingly. Optionally, the method also includes at least one of the following:

[0148] receiving the location status information of the terminal periodically reported by the terminal;

[0149] The receiving terminal reports the location status information when the preset trigger condition is met;

[0150] receiving a transmission delay difference between a transmission delay to a first network node and a transmission delay to a second network node reported by a terminal;

[0151] The round-trip time RTT of the first network node and / or the round-trip time RTT to the second network node reported by the receiving terminal.

[0152] Optionally, the location status information includes at least one of the terminal's geographical location, moving direction and moving speed.

[0153] By acquiring the location status information of the terminal, the cell where the terminal is located can determine the neighboring cells according to the location status of the terminal and in combination with its own ephemeris information.

[0154] Optionally, the terminal may also trigger an event to report its own location status information, such as when the distance between the terminal and the first network node is greater than or equal to a first threshold, or when the distance between the terminal and the second network node is less than or equal to a second threshold. When at least one of the above conditions is met, the terminal may trigger the execution of its own location status information reporting; wherein, the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0155] Optionally, in step S210, the configuration information sent by the first cell to the second cell includes at least one of the following information:

[0156] Context information of the terminal;

[0157] Hybrid Automatic Repeat reQuest (HARQ) cache information;

[0158] Packet Data Convergence Protocol (PDCP) / Radio Link Control (RLC) cache information;

[0159] The data to be transmitted to the terminal is obtained by the core network.

[0160] The context information of the terminal includes at least one of the following:

[0161] Configuration information of the protocol stack functional body of the terminal (such as configuration information of at least one of the physical PHY layer, the media access control (Media Access Control, MAC) layer, the radio link control (Radio Link Control, RLC) layer, the PDCP, and the service data adaptation protocol (Service Data Adaptation Protocol, SDAP) layer);

[0162] Terminal-related variable information (such as timers, counters and / or PDCP sequence numbers (Sequence Number, SN));

[0163] Security context information of the terminal;

[0164] Radio Bearer (RB) carries information.

[0165] The timer may be timer information involved in DRX, and the counter may be counter information involved in random access, etc.

[0166] Optionally, the first cell also needs to send data received from the core network but not yet sent to the terminal to a network node where the terminal performs cell switching, so that the network node can send the data from the core network to the terminal after completing the terminal-unaware switching.

[0167] It should be noted that the network node for which the terminal needs to perform cell switching can be uniquely determined based on the location status information of the terminal and the location information of the network node itself.

[0168] In the embodiment of the present invention, optionally, the method further includes:

[0169] The first cell determines the time to send the SSB based on the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or based on the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal.

[0170] With this implementation, the first cell can determine the time to send the SSB based on the above-mentioned transmission delay difference reported by the terminal, or based on the round-trip time RTT of the first network node and / or the round-trip time RTT to the second network node.

[0171] Optionally, the method further comprises:

[0172] The first cell sends to the second network node the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal; the second network node determines the time to send the SSB.

[0173] Based on this implementation, the first cell sends the above-mentioned transmission delay difference reported by the terminal to the second network node, or the round-trip time RTT of the first network node and / or the round-trip time RTT to the second network node, so that the second network node can determine the time to send the SSB.

[0174] In the embodiment of the present invention, the first network node and the second network node mentioned respectively include at least one of the following:

[0175] Space communication nodes;

[0176] Ground network nodes;

[0177] Wherein, the space communication node and the ground network node communicate via a first interface;

[0178] The space communication node includes at least one of the following protocol layers or functions:

[0179] Radio frequency unit;

[0180] Physical layer;

[0181] Medium Access Control MAC layer;

[0182] Radio link control RLC layer;

[0183] Packet Data Convergence Protocol PDCP layer;

[0184] Service Data Adaptation Protocol SDAP layer;

[0185] XnAP layer;

[0186] GnAP layer;

[0187] GTP-U layer;

[0188] IP layer;

[0189] F1AP layer.

[0190] Optionally, the space communication node includes at least one of a satellite, a high altitude platform (HAPS), an airplane, a drone, and a hot air balloon;

[0191] The ground network node includes at least one of a base station, a gateway, and a centralized unit (CU).

[0192] Optionally, the switching method according to the embodiment of the present invention further includes:

[0193] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0194] The at least one PCI or at least one set of SSB sent is different from or on a different synchronization grid from the at least one PCI or at least one set of SSB sent by at least one second cell. Optionally, the switching method described in the embodiment of the present invention further includes:

[0195] Determine whether the terminal needs to change the cell according to at least one of the following information:

[0196] The location information of the terminal;

[0197] The terminal's movement speed and / or direction;

[0198] Elevation information of the terminal and space communication nodes;

[0199] the movement speed and / or direction of the space communication node;

[0200] The relative distance from the terminal to the spatial communication node or cell;

[0201] Ground network nodes and time information corresponding to space communication nodes;

[0202] ephemeris information of space communication nodes;

[0203] Orbital information of space communication nodes;

[0204] The neighboring cell / beam Reference Signal Receiving Power (RSRP) measurement value is greater than the configured threshold;

[0205] The RSRP measurement value of the serving cell / beam is less than the configured threshold;

[0206] Distribution of RSRP.

[0207] In the switching method described in the embodiment of the present invention, optionally, any one of the above-mentioned information can be used as a trigger condition for determining whether a cell change will occur; optionally, a combination of at least two of the above-mentioned information can also be used as a trigger condition for determining whether a cell change will occur, and which specific information is used as the trigger condition for determination can be determined based on actual communication requirements.

[0208] Optionally, the method further includes: determining that the terminal needs to change the cell when at least one of the following situations is detected:

[0209] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[0210] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[0211] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[0212] Among them, the change of the cell of the first space communication node to the cell of the second space communication node refers to the cell where the terminal is located determined according to the location of the terminal. Specifically, it can be judged whether the cell of the first space communication node is changed to the cell of the second space communication node, and whether the ground network node is changed based on any information or a combination of at least two information such as the location information, moving speed and / or direction of the terminal listed above.

[0213] Optionally, in the handover method, in step S210, sending the configuration information of the terminal to the network node of the second cell includes at least one of the following:

[0214] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first space communication node to the second space communication node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node;

[0215] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first ground network node to the second ground network node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first space communication node to the second space communication node;

[0216] When the ground network node of the cell changes and the space communication node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node.

[0217] Optionally, the switching method further comprises at least one of the following:

[0218] The space communication node informs the ground network node of the capability of supporting simultaneous connection to two ground network nodes and / or the capability of supporting simultaneous maintenance of cells corresponding to different ground network nodes;

[0219] The space communication node informs the ground network node that it does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0220] The space communication node informs the ground network node whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0221] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[0222] The switching method described in this embodiment adopts the above-mentioned manner, and the space network node can inform the ground network node of the supported capabilities.

[0223] Optionally, the switching method further comprises at least one of the following:

[0224] The first cell broadcasts at least one common configuration information of the second cell, the configuration information and time information used when the terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0225] The first cell broadcasts common configuration information of at least one second cell, configuration information used when a terminal or terminal group at different locations under the first cell switches to the second cell, and corresponding time information; wherein the time information includes absolute time information and / or time range information;

[0226] The first cell broadcasts random access resource information of at least one second cell; wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0227] The first cell broadcasts the moving speed and / or direction of the spatial communication node of the first cell and / or the second cell;

[0228] The first cell broadcasts the space communication nodes of the first cell and / or the second cell, the corresponding ground network nodes and time information;

[0229] The first cell broadcasts the time information required for the first space communication node of the first cell and / or the second cell to switch to the second space communication node; wherein the time information includes the start time, end time and / or switching duration of the switching;

[0230] The first cell broadcasts the ephemeris information of the space communication node of the first cell and / or the second cell;

[0231] The first cell broadcasts orbit information of the space communication node of the first cell and / or the second cell;

[0232] The first cell broadcasts a threshold value greater than the RSRP measurement value of the neighboring cell / beam that triggers cell switching;

[0233] The first cell broadcasts a threshold value that the RSRP measurement value of the serving cell / beam that triggers cell switching is less than;

[0234] The first cell broadcasts distribution information of RSRP / reference signal receiving quality (RSRQ) / signal to interference plus noise ratio (SINR) of the serving cell and / or neighboring cell that triggers cell switching;

[0235] The first cell broadcasts a TA list supported by the first cell and / or the second cell;

[0236] The cell global identifier broadcast by the first cell.

[0237] Optionally, in the handover method, when the first cell broadcasts a TA list supported by the first cell and / or the second cell, the method further includes at least one of the following:

[0238] The first cell broadcasts a TA list supported by the first cell and / or the second cell and time information corresponding to the TAs in the TA list;

[0239] There is a correspondence between the TA in the TA list broadcasted by the network management and received by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[0240] A correspondence between a TA in a TA list broadcasted by a network manager and received by a first network node corresponding to the first cell and a cell global identifier broadcasted by the first cell;

[0241] The correspondence between the TA in the TA list broadcast by the first cell and the cell global identifier broadcast by the first cell.

[0242] Optionally, in the handover method, when the first cell broadcasts the cell global identifier broadcast by the first cell, the method further includes at least one of the following:

[0243] The first cell broadcasts at least two cell global identifiers, one of which is used for security entry and the other corresponds to the geographical location;

[0244] The first cell broadcasts m+1 global cell identifiers, one of which is used for secure entry, and the other m correspond to geographic location and time;

[0245] The cell global identifier broadcast by the first cell is different from the cell global identifier sent to the core network by the first network node corresponding to the first cell, wherein there is a corresponding relationship between the cell global identifier sent to the core network by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[0246] The cell global identifier broadcast by the first cell and the cell global identifier sent by the first network node corresponding to the first cell to the second network node corresponding to the second cell are the same as or different from each other;

[0247] A mapping table of a cell global identifier broadcasted by a first network node corresponding to the first cell and received by a network manager and sent to a core network;

[0248] When the location of the first cell changes, the global cell identifier corresponding to the geographical location is also updated;

[0249] When the location of the first cell changes, the cell global identifier corresponding to the geographical location will also be updated, but the update does not trigger a system message update;

[0250] When the location of the first cell changes, the first network node corresponding to the first cell initiates an update process to the core network and / or the second network node corresponding to the second cell.

[0251] Optionally, in the switching method, the identifier of the terminal includes at least one of the following:

[0252] Temporary Mobile Subscriber Identity (IMSI);

[0253] Subscription Permanent Identifier (SUPI);

[0254] SUbscription Concealed Identifier (SUCI);

[0255] The cell radio network temporary identifier C-RNTI of the terminal;

[0256] The truncated C-RNTI of the terminal; the recovery identification information of the terminal;

[0257] Truncated recovery identification information of the terminal;

[0258] The temporary mobile user identification code TMSI of the terminal is an offset configured by a network-side device and a unique index of the terminal in the group.

[0259] Optionally, the switching method further comprises at least one of the following:

[0260] The terminal randomly selects a time within a preset time range to access the second cell;

[0261] The terminal uses its own terminal identification and the parameters broadcast by the first cell to obtain a time within a preset time range to access the second cell;

[0262] The terminal uses the time information of the Physical Random Access Channel (PRACH) notified by the first cell and a preset time value to determine a time to access the second cell.

[0263] Optionally, the terminal's own terminal identifier may include at least one of a cell-radio network temporary identifier (C-RNTI), an international mobile subscriber identity (IMSI), 5G-S-TMSI or ng-5G-S-TMSI-Part1.

[0264] After the first cell releases the context of the terminal, the terminal may use one of the above methods to determine the timing of accessing the second cell.

[0265] Using the switching method described in the embodiment of the present invention, as Figure 3 As shown, the process of performing cell switching includes the following steps:

[0266] S301, the terminal reports its own location status information periodically or when a preset trigger condition is met;

[0267] S302, the source network node S1 of the terminal determines at least one adjacent network node S2 according to the location status information of the terminal combined with the ephemeris information; wherein the source network node S1 sends at least one set of SSBs to the adjacent network nodes; each set of SSBs carries different broadcast messages and contains different configuration contents. In addition, the network node can predict in advance that the terminal will need to perform a handover according to the location status information of the terminal combined with the ephemeris information;

[0268] S303, the source network node S1 uses the inter-satellite link technology to send the UE configuration information to the target network node S2 in advance, where the target network node S2 can be determined by the ephemeris information and the UE location information;

[0269] S304, the target network node S2 receives the configuration information of the terminal sent by the source network node S1, and sends a confirmation message to the network node S1;

[0270] S305, the source network node S1 releases the context of the terminal, and the terminal starts to interact with the target network node S2.

[0271] By adopting the switching method described in the embodiment of the present invention, through the above process, the terminal's need to perform switching behavior can be predicted in advance based on the terminal location information and satellite ephemeris information, and the terminal's configuration information can be sent to the target network node in advance to achieve imperceptible switching of the terminal. Compared with the traditional switching mechanism, the signaling overhead between the terminal, the source network node, and the target network node is greatly reduced, and it can also better adapt to satellite communication scenarios with high-speed movement and large latency.

[0272] One embodiment of the present invention further provides a handover method, which is applied to a second network node of a second cell, such as Figure 4 As shown, the method includes:

[0273] S410, receiving configuration information of a terminal sent by a first network node corresponding to a first cell;

[0274] S420, sending confirmation information to the first cell in response to the configuration information;

[0275] S430: Execute the access process of the terminal.

[0276] Optionally, the switching method further comprises:

[0277] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0278] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one first cell.

[0279] Optionally, the method further comprises:

[0280] Receiving a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node reported by the terminal and sent by the first cell, or a round-trip time RTT from the terminal to the first network node and / or a round-trip time RTT to the second network node reported by the terminal;

[0281] Determines when to send SSB.

[0282] Optionally, in the handover method, the first network node and the second network node include at least one of the following:

[0283] Space communication nodes;

[0284] Ground network nodes;

[0285] Wherein, the space communication node and the ground network node communicate via a first interface;

[0286] The space communication node includes at least one of the following protocol layers or functions:

[0287] Radio frequency unit;

[0288] Physical layer;

[0289] Medium Access Control MAC layer;

[0290] Radio link control RLC layer;

[0291] Packet Data Convergence Protocol PDCP layer;

[0292] Service Data Adaptation Protocol SDAP layer;

[0293] XnAP layer;

[0294] GnAP layer;

[0295] GTP-U layer;

[0296] IP layer;

[0297] F1AP layer.

[0298] Optionally, the method further comprises:

[0299] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0300] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one first cell or is on a different synchronization grid.

[0301] Optionally, the switching method further comprises at least one of the following:

[0302] Receive common configuration information of at least one second cell broadcast by the first cell, configuration information and time information used when a terminal in the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0303] Receive common configuration information of at least one second cell broadcast by the first cell, configuration information used when a terminal or terminal group at different locations under the first cell switches to the second cell, and corresponding time information; wherein the time information includes absolute time information and / or time range information;

[0304] Receiving random access resource information of at least one second cell broadcast by the first cell, wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0305] A moving speed and / or direction of a spatial communication node of the first cell and / or the second cell receiving broadcast of the first cell;

[0306] Receiving the spatial communication node of the first cell and / or the second cell, the corresponding ground network node and time information broadcast by the first cell;

[0307] Time information required for a first space communication node of a first cell and / or a second cell to switch to a second space communication node after receiving the broadcast of the first cell; wherein the time information includes a start time, an end time and / or a switching duration of the switching;

[0308] Receiving ephemeris information of a space communication node of the first cell and / or the second cell broadcast by the first cell;

[0309] Receiving orbit information of a space communication node of the first cell and / or the second cell broadcast by the first cell;

[0310] A measured value of a neighboring cell / beam reference signal receiving power (RSRP) triggering cell switching broadcast by the first cell is greater than a threshold value;

[0311] A serving cell / beam RSRP measurement value that triggers cell switching and is received by the first cell is less than a threshold value;

[0312] Receiving distribution information of RSRP / reference signal reception quality RSRQ / signal to interference plus noise ratio SINR of a serving cell and / or a neighboring cell that triggers cell switching broadcast by the first cell;

[0313] Receiving a TA list supported by the first cell and / or the second cell broadcasted by the first cell;

[0314] A cell global identifier broadcast by the first cell is received.

[0315] Optionally, the terminal identifier includes at least one of the following:

[0316] Temporary Mobile Subscriber Identity (IMSI);

[0317] SUPI;

[0318] SUCI;

[0319] The cell radio network temporary identifier C-RNTI of the terminal;

[0320] The truncated C-RNTI of the terminal; the recovery identification information of the terminal;

[0321] Truncated recovery identification information of the terminal;

[0322] The temporary mobile user identification code TMSI of the terminal is an offset configured by a network-side device and a unique index of the terminal in the group.

[0323] Optionally, in the switching method, the configuration information of the terminal includes at least one of the following information:

[0324] Context information of the terminal;

[0325] Hybrid automatic repeat request HARQ buffer information;

[0326] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[0327] The data to be transmitted to the terminal is obtained by the core network.

[0328] Optionally, in the switching method, in at least one set of synchronization signals and physical broadcast channel blocks SSB sent, different broadcast messages carried by each set of SSB include different configuration information.

[0329] Optionally, in the switching method, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell use at least partially the same physical cell identifier to respectively send the SSB.

[0330] Optionally, in the switching method, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[0331] Optionally, in the switching method, the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[0332] The embodiment of the present invention also provides another switching method, which is applied to a terminal, such as Figure 5 As shown, the method includes:

[0333] S510, receiving first information for handover of the terminal sent by a first network node corresponding to a first cell;

[0334] The first information includes at least one of the following information:

[0335] Decision information for switching;

[0336] Information needed for switching;

[0337] Configuration information after switching;

[0338] S520, switching to at least one second cell according to the received first information for switching of the terminal;

[0339] The second network node corresponding to the second cell is a neighboring node of the first network node corresponding to the first cell.

[0340] The switching method described in this implementation manner sends the first information for switching to the terminal through the first network node of the first cell, so that the terminal can switch according to the first information when the switching conditions are met, such as performing L3 switching, to avoid multiple interactions during the switching process, so as to adapt to satellite communication scenarios with high-speed movement and large latency.

[0341] Optionally, the switching method further comprises:

[0342] Receive at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB respectively sent by second network nodes corresponding to the first cell and the second cell; wherein the second network node corresponding to the second cell is an adjacent node of the first network node corresponding to the first cell.

[0343] Optionally, the switching method further comprises:

[0344] Receiving at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0345] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[0346] Optionally, in the handover method, the first network node and the second network node include at least one of the following:

[0347] Space communication nodes;

[0348] Ground network nodes;

[0349] Wherein, the space communication node and the ground network node communicate via a first interface;

[0350] The space communication node includes at least one of the following protocol layers or functions:

[0351] Radio frequency unit;

[0352] Physical layer;

[0353] Medium Access Control MAC layer;

[0354] Radio link control RLC layer;

[0355] Packet Data Convergence Protocol PDCP layer;

[0356] Service Data Adaptation Protocol SDAP layer;

[0357] XnAP layer;

[0358] GnAP layer;

[0359] GTP-U layer;

[0360] IP layer;

[0361] F1AP layer.

[0362] Optionally, in the switching method, the decision information for switching includes at least one of the following information:

[0363] The location information of the terminal;

[0364] The terminal's movement speed and / or direction;

[0365] Elevation information of the terminal and space communication nodes;

[0366] the movement speed and / or direction of the space communication node;

[0367] The relative distance from the terminal to the spatial communication node or cell;

[0368] Ground network nodes and time information corresponding to space communication nodes;

[0369] ephemeris information of space communication nodes;

[0370] Orbital information of space communication nodes;

[0371] The neighboring cell / beam RSRP and / or RSRQ measurement value is greater than the configured threshold;

[0372] The RSRP and / or RSRQ measurement value of the serving cell / beam is less than the configured threshold;

[0373] The Time Advanced (TA) value of the serving cell / beam is greater than the configured threshold;

[0374] The TA value of the neighboring cell / beam is less than the configured threshold;

[0375] Distribution of RSRP.

[0376] In this implementation manner, the terminal switching scenario may include at least one of the following situations:

[0377] The terminal makes a judgment based on its own position information and the ephemeris information of the space communication node, and when the distance between the terminal and the first space communication node or the first cell is greater than the first threshold and / or the distance between the terminal and the second space communication node or the second cell is less than the second threshold, a cell change is required;

[0378] A judgment is made based on the elevation angle information of the terminal and the space communication node. When the elevation angle between the terminal and the first space communication node or the first cell is greater than a first threshold and / or the elevation angle between the terminal and the second space communication node or the second cell is less than a second threshold, a cell change is required.

[0379] A judgment is made based on the RSRP and / or RSRQ measurement values ​​of the neighboring cell / beam and / or the serving cell / beam. When the RSRP and / or RSRQ measurement values ​​of the neighboring cell / beam are greater than the first threshold and / or the RSRP and / or RSRQ measurement values ​​of the serving cell / beam are less than the configured second threshold, a cell change is required.

[0380] It should be noted that each of the above embodiments can be used independently as a decision condition, or can be combined with each other as a joint decision condition.

[0381] Optionally, the handover method further comprises: the decision information for handover includes determining whether a cell change is required when at least one of the following situations is detected:

[0382] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[0383] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[0384] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[0385] Optionally, the switching method further comprises, the terminal receiving at least one of the following broadcasted by the spatial network node:

[0386] The space communication node supports the capability of connecting to two ground network nodes at the same time and / or supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0387] The space communication node does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0388] Whether the space communication node supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of simultaneously maintaining cells corresponding to different ground network nodes;

[0389] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[0390] Optionally, the switching method further comprises at least one of the following:

[0391] Receive common configuration information of at least one second cell broadcast by the first cell and / or configuration information and time information used when a terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0392] Receiving random access resource information of at least one second cell broadcast by the first cell, wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0393] A moving speed and / or direction of a spatial communication node of the first cell and / or the second cell receiving broadcast of the first cell;

[0394] Receiving the spatial communication node of the first cell and / or the second cell, the corresponding ground network node and time information broadcast by the first cell;

[0395] Time information required for a first spatial communication node of a first cell to switch to a second spatial communication node corresponding to a second cell after receiving the broadcast of the first cell; wherein the time information includes a start time, an end time and / or a switching duration;

[0396] Receiving ephemeris information of a space communication node of the first cell broadcast by the first cell;

[0397] receiving orbit information of a space communication node of the first cell broadcast by the first cell;

[0398] Receive a threshold value of the neighboring cell / beam RSRP measurement value that triggers cell switching and is broadcast by the first cell;

[0399] A serving cell / beam RSRP measurement value that triggers cell switching and is received by the first cell is less than a threshold value;

[0400] Receive RSRP / RSRQ / SINR distribution information of the serving cell and / or neighboring cell that triggers cell switching broadcast by the first cell.

[0401] Optionally, the switching method further comprises at least one of the following:

[0402] The terminal randomly selects a time within a preset time range to access the second cell;

[0403] The terminal uses its own terminal identifier and the parameters broadcast by the first cell and / or notified to the terminal through dedicated RRC signaling, and obtains a time within a preset time range to access the second cell after taking a modulo.

[0404] The terminal determines a time to access the second cell using the PRACH time information notified by the first cell and a preset time value;

[0405] The terminal uses its own geographical location and the moving speed and / or direction of the spatial communication node of the second cell to determine a suitable time to access the second cell.

[0406] For example, the terminal uses its own geographical location and the moving speed and / or direction of the spatial communication node of the second cell to determine the appropriate time for the terminal to approach or enter the coverage of the second cell, and access the second cell at the appropriate time. For example, at time t0, the coverage diameter of the first cell is from x0 to x10, and UE1 and UE2 are at positions x0 to x2 respectively; UE3 and UE4 are at positions x7 to x9 respectively; the coverage diameter of the second cell is from x20 to x30, and with the movement of the space communication node corresponding to the first cell and the space communication node corresponding to the second cell, at time t1, the coverage of the second cell is from x7 to x17, and UE3 and UE4 use their own geographical locations and the moving speed and / or direction of the space communication node of the second cell to determine that at time t1, the coverage of the second cell is from x7 to x17, so UE3 and UE4 access the second cell at time t1); at time t2, the coverage of the second cell is from x0 to x10, and UE1 and UE2 use their own geographical locations and the moving speed and / or direction of the space communication node of the second cell to determine that at time t2, the coverage of the second cell is from x0 to x10, so UE1 and UE2 access the second cell at time t2)).

[0407] Using this implementation, optionally, the first cell can use ephemeris information and / or UE location information to obtain the time window in which one and / or more UEs are about to switch, and then notify the terminal of the time window through a system message and / or dedicated signaling. The terminal uses its own terminal identifier and the time window to obtain the specific time when it accesses the second cell.

[0408] The embodiment of the present invention further provides a handover method, which is applied to a first network node corresponding to a first cell, such as Figure 6 As shown, the method includes:

[0409] S610: When determining that the terminal needs to change the cell or before the cell change is performed, send second information for switching to a second network node corresponding to at least one second cell, where the second cell is a target cell for the terminal to perform cell switching;

[0410] S620, receiving third information for handover sent by a second network node corresponding to at least one second cell;

[0411] S630, sending first information for switching to the terminal;

[0412] S640: After receiving confirmation information of completion of the cell change sent by the second network node and / or the terminal or after a timer expires, release the context of the terminal.

[0413] By adopting the switching method described in this embodiment, when the terminal needs to change the cell or before the cell change, the second information for switching is sent to the second cell, and the first information for switching is sent to the terminal, so that the terminal switches from the first cell to the second cell when the switching conditions are met, avoiding multiple interactions during the switching process to adapt to satellite communication scenarios with high-speed movement and large latency.

[0414] Optionally, the switching method further comprises:

[0415] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0416] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[0417] Optionally, the switching method further comprises:

[0418] The first cell determines the time to send the SSB based on the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or based on the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal.

[0419] Optionally, the switching method further comprises:

[0420] The first cell sends to the second network node the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal; the second network node determines the time to send the SSB.

[0421] Optionally, in the switching method, the first network node and the second network node respectively include at least one of the following:

[0422] Space communication nodes;

[0423] Ground network nodes;

[0424] Wherein, the space communication node and the ground network node communicate via a first interface;

[0425] The space communication node includes at least one of the following protocol layers or functions:

[0426] Radio frequency unit;

[0427] Physical layer;

[0428] Medium Access Control MAC layer;

[0429] Radio link control RLC layer;

[0430] Packet Data Convergence Protocol PDCP layer;

[0431] Service Data Adaptation Protocol SDAP layer;

[0432] XnAP layer;

[0433] GnAP layer;

[0434] GTP-U layer;

[0435] IP layer;

[0436] F1AP layer.

[0437] Optionally, the switching method further comprises:

[0438] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0439] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[0440] Optionally, in the handover method, the decision condition for the first network node to perform terminal handover and / or the handover evaluation condition sent by the first network node to the terminal include determining whether the terminal needs to perform a cell change according to at least one of the following information:

[0441] The location information of the terminal;

[0442] The terminal's movement speed and / or direction;

[0443] Elevation information of the terminal and space communication nodes;

[0444] the movement speed and / or direction of the space communication node;

[0445] a relative distance from the terminal to the first spatial communication node or the first cell;

[0446] a relative distance from the terminal to the second spatial communication node or the second cell;

[0447] The satellite elevation angle between the terminal and the first space communication node is less than or equal to the first threshold value;

[0448] The satellite elevation angle between the terminal and the second space communication node is greater than or equal to a second threshold value;

[0449] The transmission delay between the terminal and the first spatial communication node is greater than or equal to a third threshold value;

[0450] The transmission delay between the terminal and the second spatial communication node is less than or equal to a fourth threshold value;

[0451] The transmission delay difference between the terminal and the first network node and the terminal and the second network node reaches a fifth threshold value; the ground network node and time information corresponding to the space communication node;

[0452] ephemeris information of space communication nodes;

[0453] Orbital information of space communication nodes;

[0454] The neighboring cell / beam RSRP measurement value is greater than or equal to the sixth threshold value;

[0455] The serving cell / beam RSRP measurement value is less than or equal to the seventh threshold value;

[0456] The TA value of the serving cell / beam is greater than or equal to the eighth threshold value;

[0457] The TA value of the neighboring cell / beam is less than or equal to the ninth threshold value;

[0458] The distribution of RSRP follows a certain rule.

[0459] Optionally, the handover method further comprises: determining that the terminal needs to change the cell when at least one of the following situations is detected:

[0460] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[0461] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[0462] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[0463] Optionally, in the switching method, the second information includes at least one of the following information:

[0464] UE identification;

[0465] UE's Quality of Service (QoS) service characteristics and conditional switching indication;

[0466] Information related to the location of the UE;

[0467] location information and ephemeris information of the first space communication node;

[0468] elevation angle information of the terminal and the first space communication node and / or the second space communication node;

[0469] a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[0470] a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node;

[0471] The location information of the terminal;

[0472] The terminal's movement speed and / or direction;

[0473] a relative distance from the terminal to the first spatial communication node and / or the second spatial communication node;

[0474] a relative distance from the terminal to the first cell and / or the second cell;

[0475] Neighboring cell / beam RSRP and / or RSRQ measurements;

[0476] Serving cell / beam RSRP and / or RSRQ measurements;

[0477] TA value of the serving cell / beam;

[0478] TA value of neighboring cells / beams;

[0479] Distribution of RSRP.

[0480] Optionally, in the switching method, the second information includes at least one of the following information:

[0481] a first ground network node and time information corresponding to the first space communication node;

[0482] ephemeris information of the first space communication node;

[0483] Orbital information of space communication nodes;

[0484] Terminal UE group identifier;

[0485] The number of terminal UEs;

[0486] Group switching indication;

[0487] Information of each terminal UE,

[0488] The information of each terminal includes at least one of the following:

[0489] UE identification, UE QoS service characteristics, UE location-related information, location information between the first space communication node, ephemeris information, elevation information between the terminal and the first space communication node and / or the second space communication node, the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node, the round-trip time RTT from the terminal to the first network node and / or to the second network node, the terminal's location information, the terminal's moving speed and / or direction, the relative distance from the terminal to the first space communication node and / or the second space communication, the relative distance from the terminal to the first cell and / or the second cell, the measured value of the RSRP and / or RSRQ of the neighboring cell / beam, the measured value of the RSRP and / or RSRQ of the serving cell / beam, the TA value of the serving cell / beam, and the distribution of the TA value and RSRP of the neighboring cell / beam.

[0490] Optionally, the handover method, wherein sending the second information for handover to a second network node corresponding to at least one second cell, includes:

[0491] In at least one of the following situations, the configuration information of the terminal is sent to the second network node of the second cell:

[0492] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first space communication node to the second space communication node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node;

[0493] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first ground network node to the second ground network node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first space communication node to the second space communication node;

[0494] When the ground network node of the cell changes and the space communication node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node.

[0495] Optionally, in the switching method, the third information includes at least one of the following:

[0496] Conditional switching indication;

[0497] Group switching indication;

[0498] Configuration information of the terminal for use in the second cell;

[0499] Common configuration information of the terminal for group handover in the second cell and / or dedicated configuration information of the second cell;

[0500] The common configuration information of the terminal for group handover in the second cell and / or the dedicated configuration information of the second cell, the configuration information used and the time information; wherein the time information includes absolute time information and / or time range information;

[0501] Time information of switching of the terminal to access the second cell;

[0502] the movement speed and / or direction of the second spatial communication node;

[0503] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[0504] ground network node and time information corresponding to the second space communication node;

[0505] ephemeris information of a second space communication node;

[0506] orbit information of the second space communication node;

[0507] The handover evaluation condition recommended by the second spatial communication node.

[0508] Optionally, the switching method, wherein:

[0509] The first information for switching includes at least one of the following:

[0510] Conditional switching indication;

[0511] Group switching indication;

[0512] Configuration information of the terminal for use in n second cells;

[0513] The terminal for group handover is used for common configuration information of n second cells and / or dedicated configuration information of the n second cells;

[0514] The terminal of the group handover is used for the common configuration information of the n second cells and / or the dedicated configuration information of the n second cells, the used configuration information and the time information; wherein the time information includes the absolute time information and / or the time range information;

[0515] Time information of switching of the terminal accessing n second cells;

[0516] the movement speed and / or direction of the second spatial communication node;

[0517] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[0518] ground network node and time information corresponding to the second space communication node;

[0519] ephemeris information of a second space communication node;

[0520] orbit information of the second space communication node;

[0521] Evaluation conditions for switching;

[0522] Wherein n is an integer greater than or equal to 1.

[0523] Optionally, in the switching method, sending the first information for switching to the terminal includes at least one of the following:

[0524] Sending first information using dedicated RRC information;

[0525] Sending the common configuration information of the second cell accessed by the terminal in the group handover in the first information by means of a broadcast message;

[0526] Sending, by broadcast message, the common configuration information of the second cell accessed by the terminal in the group handover in the first information, the configuration information and time information used when the terminal in the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0527] Sending, by broadcast message, the common configuration information of the second cell accessed by the terminal in the group handover in the first information, the configuration information used when the terminal or terminal group at different positions under the first cell is switched to the second cell, and the corresponding time information; wherein the time information includes absolute time information and / or time range information;

[0528] Sending a dedicated signaling part of the second cell accessed by the terminal in the group handover in the first information by using dedicated signaling;

[0529] Send the configuration information of the second cell accessed by the terminals of the group by multicast, and scramble it with the group-Radio Network Temporary Identity (G-RNTI) corresponding to the group;

[0530] The configuration information of the second cell accessed by the terminals of the group is sent by multicast, and the configuration information and time information used when the terminals under the group switch to the second cell; wherein the time information includes absolute time information and / or time range information; and is encrypted with the G-RNTI corresponding to the group.

[0531] Optionally, in the handover method, when the configuration information of the second cell accessed by the terminal of the group is sent in a multicast manner, the method further comprises:

[0532] The identifier of the group, the G-RNTI of the group, control information of radio resources for sending group information, and / or radio resource information for sending group information are sent to the terminals of the group.

[0533] Optionally, in the handover method, when the configuration information of the second cell accessed by the terminal of the group is sent in a multicast manner, the method further comprises:

[0534] The first network node divides the terminal into groups using the terminal identifier;

[0535] The first network node divides the terminals into groups using their locations;

[0536] The first network node divides the terminal into groups by determining the time when the terminal approaches or enters the coverage of the second cell by using the geographical location of the terminal and the moving speed and / or direction of the spatial communication node of the second cell.

[0537] Optionally, the switching method further comprises at least one of the following:

[0538] The space communication node informs the ground network node of the capability of supporting simultaneous connection to two ground network nodes and / or the capability of supporting simultaneous maintenance of cells corresponding to different ground network nodes;

[0539] The space communication node informs the ground network node that it does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0540] The space communication node informs the ground network node whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0541] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[0542] Optionally, the switching method further comprises at least one of the following:

[0543] The first cell broadcasts random access resource information of at least one second cell; wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0544] The first cell broadcasts the moving speed and / or direction of the spatial communication node of the first cell and / or the second cell;

[0545] The first cell broadcasts the space communication nodes of the first cell and / or the second cell, the corresponding ground network nodes and time information;

[0546] The first cell broadcasts the time information required for the first space communication node of the first cell and / or the second cell to switch to the second space communication node; wherein the time information includes the start time, end time and / or switching duration of the switching;

[0547] The first cell broadcasts the ephemeris information of the space communication node of the first cell and / or the second cell;

[0548] The first cell broadcasts orbit information of the space communication node of the first cell and / or the second cell;

[0549] The first cell broadcasts a threshold value greater than the RSRP measurement value of the neighboring cell / beam that triggers cell switching;

[0550] The first cell broadcasts a threshold value that the RSRP measurement value of the serving cell / beam that triggers cell switching is less than;

[0551] The first cell broadcasts distribution information of RSRP / RSRQ / SINR of the serving cell and / or neighboring cell that triggers cell switching;

[0552] The first cell broadcasts a TA list supported by the first cell and / or the second cell;

[0553] The cell global identifier broadcast by the first cell.

[0554] Optionally, in the handover method, when the first cell broadcasts a TA list supported by the first cell and / or the second cell, the method further includes at least one of the following:

[0555] The first cell broadcasts a TA list supported by the first cell and / or the second cell and time information corresponding to the TAs in the TA list;

[0556] There is a correspondence between the TA in the TA list broadcasted by the network management and received by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[0557] A correspondence between a TA in a TA list broadcasted by a network manager and received by a first network node corresponding to the first cell and a cell global identifier broadcasted by the first cell;

[0558] The correspondence between the TA in the TA list broadcast by the first cell and the cell global identifier broadcast by the first cell.

[0559] Optionally, in the handover method, when the first cell broadcasts the cell global identifier broadcast by the first cell, the method further includes at least one of the following:

[0560] The first cell broadcasts at least two cell global identifiers, one of which is used for security entry and the other corresponds to the geographical location;

[0561] The first cell broadcasts m+1 cell global identifiers, one of which is used for security entry, and the other m correspond to the geographic location and time; where m is an integer greater than or equal to 1;

[0562] The cell global identifier broadcast by the first cell is different from the cell global identifier sent to the core network by the first network node corresponding to the first cell, wherein there is a corresponding relationship between the cell global identifier sent to the core network by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[0563] The cell global identifier broadcast by the first cell and the cell global identifier sent by the first network node corresponding to the first cell to the second network node corresponding to the second cell are the same as or different from each other;

[0564] A mapping table of a cell global identifier broadcasted by a first network node corresponding to the first cell and received by a network manager and sent to a core network;

[0565] When the location of the first cell changes, the global cell identifier corresponding to the geographical location is also updated;

[0566] When the location of the first cell changes, the cell global identifier corresponding to the geographical location will also be updated, but the update does not trigger a system message update;

[0567] When the location of the first cell changes, the first network node corresponding to the first cell initiates an update process to the core network and / or the second network node corresponding to the second cell.

[0568] Optionally, the switching method further comprises:

[0569] receiving the location status information of the terminal periodically reported by the terminal;

[0570] The receiving terminal reports the location status information when the preset trigger condition is met;

[0571] Reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[0572] Reporting a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node.

[0573] Optionally, in the switching method, the configuration information of the terminal includes at least one of the following information:

[0574] Context information of the terminal;

[0575] Hybrid automatic repeat request HARQ buffer information;

[0576] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[0577] The data to be transmitted to the terminal is obtained by the core network.

[0578] Optionally, in the switching method, in at least one set of synchronization signals and physical broadcast channel blocks SSB sent, different broadcast messages carried by each set of SSB include different configuration information.

[0579] Optionally, in the switching method, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell use at least partially the same physical cell identifier to respectively send the SSB.

[0580] Optionally, in the switching method, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[0581] Optionally, in the switching method, the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[0582] The embodiment of the present invention further provides a handover method, which is applied to a second network node corresponding to a second cell, such as Figure 7 As shown, the method includes:

[0583] S710, receiving second information for handover of a terminal sent by a first network node corresponding to a first cell, wherein the first cell is a source cell of the terminal, and the second cell is a target cell for cell handover of the terminal;

[0584] S720: Send third information for switching to the first network node according to the second information;

[0585] S730: Execute the access process of the terminal.

[0586] Optionally, the switching method further comprises:

[0587] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0588] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one first cell.

[0589] Optionally, the switching method further comprises:

[0590] Receiving a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node reported by the terminal and sent by the first cell, or a round-trip time RTT from the terminal to the first network node and / or a round-trip time RTT to the second network node reported by the terminal;

[0591] Determines when to send SSB.

[0592] Optionally, in the switching method, the first network node and the second network node respectively include at least one of the following:

[0593] Space communication nodes;

[0594] Ground network nodes;

[0595] Wherein, the space communication node and the ground network node communicate via a first interface;

[0596] The space communication node includes at least one of the following protocol layers or functions:

[0597] Radio frequency unit;

[0598] Physical layer;

[0599] Medium Access Control MAC layer;

[0600] Radio link control RLC layer;

[0601] Packet Data Convergence Protocol PDCP layer;

[0602] Service Data Adaptation Protocol SDAP layer;

[0603] XnAP layer;

[0604] GnAP layer;

[0605] GTP-U layer;

[0606] IP layer;

[0607] F1AP layer.

[0608] Optionally, the switching method further comprises:

[0609] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0610] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[0611] Optionally, in the switching method, the second information includes at least one of the following information:

[0612] UE identification;

[0613] UE QoS service characteristics and conditional switching indication;

[0614] Information related to the location of the UE;

[0615] location information and ephemeris information of the first space communication node;

[0616] elevation angle information of the terminal and the first space communication node and / or the second space communication node;

[0617] a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[0618] a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node;

[0619] The location information of the terminal;

[0620] The terminal's movement speed and / or direction;

[0621] a relative distance from the terminal to the first spatial communication node and / or the second spatial communication node;

[0622] a relative distance from the terminal to the first cell and / or the second cell;

[0623] Neighboring cell / beam RSRP and / or RSRQ measurements;

[0624] Serving cell / beam RSRP and / or RSRQ measurements;

[0625] TA value of the serving cell / beam;

[0626] TA value of neighboring cells / beams;

[0627] Distribution of RSRP.

[0628] Optionally, in the switching method, the second information includes at least one of the following information:

[0629] a first ground network node and time information corresponding to the first space communication node;

[0630] ephemeris information of the first space communication node;

[0631] Orbital information of space communication nodes;

[0632] Terminal UE group identifier;

[0633] The number of terminal UEs;

[0634] Group switching indication;

[0635] Information of each terminal UE,

[0636] The information of each terminal includes at least one of the following:

[0637] UE identification, UE QoS service characteristics, UE location-related information, location information between the first space communication node, ephemeris information, elevation information between the terminal and the first space communication node and / or the second space communication node, the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node, the round-trip time RTT from the terminal to the first network node and / or to the second network node, the terminal's location information, the terminal's moving speed and / or direction, the relative distance from the terminal to the first space communication node and / or the second space communication, the relative distance from the terminal to the first cell and / or the second cell, the measured value of the RSRP and / or RSRQ of the neighboring cell / beam, the measured value of the RSRP and / or RSRQ of the serving cell / beam, the TA value of the serving cell / beam, and the distribution of the TA value and RSRP of the neighboring cell / beam.

[0638] Optionally, in the switching method, the third information includes at least one of the following:

[0639] Conditional switching indication;

[0640] Group switching indication;

[0641] Configuration information of the terminal for use in the second cell;

[0642] Common configuration information of the terminal for group handover in the second cell and / or dedicated configuration information of the second cell;

[0643] The common configuration information of the terminal for group handover in the second cell and / or the dedicated configuration information of the second cell, the configuration information used and the time information; wherein the time information includes absolute time information and / or time range information;

[0644] Time information of switching of the terminal to access the second cell;

[0645] the movement speed and / or direction of the second spatial communication node;

[0646] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[0647] ground network node and time information corresponding to the second space communication node;

[0648] ephemeris information of a second space communication node;

[0649] orbit information of the second space communication node;

[0650] The handover evaluation condition recommended by the second spatial communication node.

[0651] Using the switching method described in one embodiment of the present invention, in one implementation manner, the switching process may include the following process:

[0652] Step 1: The first network node corresponding to the first cell decides to use conditional switching ( Conditional HandOver, CHO);

[0653] Step 2: The first network node corresponding to the first cell sends a CHO request message to the network nodes corresponding to one or more candidate cells, where the CHO request message includes at least one of the following information: a UE group identifier, the number of UEs, and a group switching indication;

[0654] The specific information of each UE includes at least one of the following:

[0655] UE identification, UE QoS service characteristics, UE location-related information, location information and ephemeris information between the first spatial communication nodes, etc.

[0656] The terminal UE reports at least one of the following information to the first network node:

[0657] elevation angle information of the terminal and the first space communication node and / or the second space communication node;

[0658] The transmission delay difference between the terminal and the first network node and the terminal and the second network node;

[0659] Round trip time (RTT) from the terminal to the first network node and / or to the second network node;

[0660] The location information of the terminal;

[0661] The terminal's movement speed and / or direction;

[0662] the movement speed and / or direction of the space communication node;

[0663] The relative distance from the terminal to the spatial communication node or cell;

[0664] Ground network nodes and time information corresponding to space communication nodes;

[0665] ephemeris information of space communication nodes;

[0666] Orbital information of space communication nodes;

[0667] Neighboring cell / beam RSRP and / or RSRQ measurements;

[0668] Serving cell / beam RSRP and / or RSRQ measurements;

[0669] TA value of the serving cell / beam;

[0670] TA value of neighboring cells / beams;

[0671] Distribution of RSRP.

[0672] Step 3: The network nodes corresponding to one or more candidate cells send a confirmation message to the network node corresponding to the first cell, where the confirmation message includes:

[0673] Specific configuration information of each UE in the second cell;

[0674] Specifically, it may be the common configuration information of the second cell used by the UE in the group handover and / or the dedicated configuration information of the second cell, the used configuration information and the time information; wherein the time information includes the absolute time information and / or the time range information;

[0675] Time information of switching of the terminal to access the second cell;

[0676] the movement speed and / or direction of the second spatial communication node;

[0677] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[0678] ground network node and time information corresponding to the second space communication node;

[0679] ephemeris information of a second space communication node;

[0680] orbit information of the second space communication node;

[0681] The switching judgment condition recommended by the second spatial communication node.

[0682] Step 4: The first network node corresponding to the first cell sends an RRC reconfiguration message RRCReconfiguration to the terminal, where the RRC reconfiguration message includes the above-mentioned CHO configuration information and CHO execution conditions, where the CHO execution conditions may optionally include:

[0683] The location information of the terminal;

[0684] The terminal's movement speed and / or direction;

[0685] Elevation information of the terminal and space communication nodes;

[0686] the movement speed and / or direction of the space communication node;

[0687] The relative distance from the terminal to the spatial communication node or cell;

[0688] Ground network nodes and time information corresponding to space communication nodes;

[0689] ephemeris information of space communication nodes;

[0690] Orbital information of space communication nodes;

[0691] The neighboring cell / beam RSRP and / or RSRQ measurement value is greater than the configured threshold;

[0692] The RSRP and / or RSRQ measurement value of the serving cell / beam is less than the configured threshold;

[0693] The TA value of the serving cell / beam is greater than the configured threshold;

[0694] The TA value of the neighboring cell / beam is less than the configured threshold;

[0695] Distribution of RSRP.

[0696] Step 5: The terminal sends an RRC reconfiguration completion message RRCReconfigurationComplete to the first network node corresponding to the first cell;

[0697] Step 6: After receiving the CHO configuration message, the terminal maintains the connection with the first network node corresponding to the first cell and starts to evaluate the CHO execution conditions of the candidate cells. If at least one CHO candidate cell meets the corresponding CHO execution conditions, the UE detaches from the first network node corresponding to the first cell, applies the stored corresponding configuration to the network node corresponding to the selected candidate cell, synchronizes with the candidate cell, and completes the RRC switching process by sending an RRCReconfigurationComplete message to the network node corresponding to the candidate cell. After successfully completing the RRC switching process, the terminal releases the stored CHO configuration information.

[0698] In example 1, the terminal makes a judgment based on its own location information and the ephemeris information of the space communication node. When the distance between the terminal and the first space communication node or the first cell is greater than the first threshold and / or the distance between the terminal and the second space communication node or the second cell is less than the second threshold, a cell change is required.

[0699] In example 2, a judgment is made based on the elevation angle information of the terminal and the space communication node. When the elevation angle between the terminal and the first space communication node or the first cell is greater than the first threshold and / or the elevation angle between the terminal and the second space communication node or the second cell is less than the second threshold, a cell change is required.

[0700] In example 3, a judgment is made based on the RSRP and / or RSRQ measurement values ​​of the neighboring cell / beam and / or the serving cell / beam. When the RSRP and / or RSRQ measurement values ​​of the neighboring cell / beam are greater than the first threshold and / or the RSRP and / or RSRQ measurement values ​​of the serving cell / beam are less than the configured second threshold, a cell change is required.

[0701] Each of the above embodiments can be used independently as a decision condition, or can be combined with each other as a joint decision condition.

[0702] Step 7: Optionally, the network node corresponding to the selected candidate cell sends a handover success message HANDOVERSUCCESS to the first network node corresponding to the first cell to notify the terminal that the selected candidate cell has been successfully accessed. Then, the first network node corresponding to the first cell sends an SN status transmission message to the network node corresponding to the selected candidate cell.

[0703] Optionally, the first network node corresponding to the first cell sends a HANDOVER CANCEL message to other signaling connections or other potential candidate cells (if any) to cancel the CHO of the terminal. Based on the above, the above approach can realize autonomous handover of the terminal and avoid multiple handover interaction processes.

[0704] In another implementation manner, the switching method according to the embodiment of the present invention comprises the following steps:

[0705] Step 1: The first network node corresponding to the first cell determines that the terminal needs to be handed over;

[0706] Step 2: The first network node corresponding to the first cell sends a "handover request" message to the network node corresponding to at least one second cell through a transparent RRC container, which contains the necessary information to prepare for handover in the second network node corresponding to at least one second cell. The information includes at least the target cell ID, KgNB*, the C-RNTI of the terminal in the first network node corresponding to the first cell, including the RRM configuration of the terminal inactive time, including the basic AS configuration of antenna Info and DL carrier frequency, the DRB mapping rule applied to the terminal by the current QoS flow, SIB1 from the source gNB, terminal functions for different RATs, PDU session related information, and may include measurement information reported by the terminal, including beam related information (if available). Optionally, the PDU session related information includes slice information and QoS configuration profile(s) at the QoS flow level;

[0707] Step 3: The second network node corresponding to at least one second cell prepares for handover and sends a "handover request confirmation" message to the first network node corresponding to the first cell, including a transparent container to be sent to the terminal as an RRC message to perform the handover.

[0708] The "Switch Request Confirmation" message includes at least one of the following information:

[0709] Public configuration information of the second cell, access random access resource information, moving speed and / or direction of the space communication node, ground network node and time information corresponding to the space communication node, and time information required for the terminal to switch to the second network node corresponding to the second cell.

[0710] Step 4: The first network node corresponding to the first cell triggers Uu handover by sending an RRC reconfiguration message RRCReconfiguration to the terminal. The first network node corresponding to the first cell sends the following information to the UE:

[0711] public configuration information of at least one second cell broadcast by the first cell, and optionally, the first cell further broadcasts configuration information and time information used when a terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0712] Access random access resource information of at least one second cell broadcast by the first cell; wherein the access random access resource information of the second cell corresponds to the identifier of the terminal;

[0713] Optionally, the identifier of the terminal includes all or part of at least one of the following: IMSI, SUPI, SUCI, a cell radio network temporary identifier C-RNTI of the terminal, a truncated C-RNTI of the terminal, recovery identification information of the terminal, and truncated recovery identification information of the terminal; optionally, a temporary mobile user identity code TMSI of the terminal, an offset configured by a network side device, and a unique index of the terminal in the group;

[0714] The moving speed and / or direction of the spatial communication node of the first cell and / or the second cell broadcast by the first cell;

[0715] Step 4: The first cell broadcasts the spatial communication nodes of the first cell and / or the second cell, the corresponding ground network nodes and time information;

[0716] Time information required for the first space communication node of the first cell broadcast by the first cell to switch to the second space communication node corresponding to the second cell; wherein the time information includes the start time, end time and / or switching duration of the switching;

[0717] ephemeris information of a space communication node of the first cell broadcast by the first cell;

[0718] The first cell broadcasts orbit information of the spatial communication node of the first cell.

[0719] Step 5: The terminal synchronizes to the target cell and completes the RRC switching process by sending an RRCReconfigurationComplete message to the second network node corresponding to the second cell.

[0720] Step 6: The second network node corresponding to the second cell sends a "path switching request" message to the AMF to trigger the 5GC to switch the DL data path to the second network node corresponding to the second cell, and establish an NG-C interface instance toward the second network node corresponding to the second cell.

[0721] Step 7: 5GC switches the DL data path to the second network node corresponding to the second cell. UPF sends one or more "end marker" packets to the first network node corresponding to the first cell on the old path of each PDU session / tunnel, and then any U-plane / TNL resources can be released to the first network node corresponding to the first cell.

[0722] Step 8: AMF confirms the PATH SWITCH REQUEST message with the PATH SWITCH REQUEST ACKNOWLEDGE message.

[0723] Step 9: After receiving the PATH SWITCH REQUEST ACKNOWLEDGE message from the AMF, the second network node corresponding to the second cell sends a terminal context release to notify the first network node corresponding to the first cell that the handover is successful. Then, the first network node corresponding to the first cell can release the radio resources and C-plane related resources associated with the terminal context. Any ongoing data forwarding can continue.

[0724] One embodiment of the present invention further provides a terminal, such as Figure 8 As shown, it includes a transceiver 810 and a processor 820, wherein the transceiver 810 is used for:

[0725] Receive at least one set of identical synchronization signals and physical broadcast channel blocks SSB respectively sent by at least two cells; the two cells are from two network nodes; wherein the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[0726] Optionally, in the terminal, the transceiver 810 is further used for at least one of the following:

[0727] Periodically reporting the location status information of the terminal;

[0728] When a preset trigger condition is met, reporting the location status information of the terminal;

[0729] Reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[0730] Reporting a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node.

[0731] Optionally, in the terminal, the preset trigger condition includes at least one of the following:

[0732] The distance between the terminal and the first network node is greater than or equal to a first threshold;

[0733] The distance between the terminal and the second network node is less than or equal to a second threshold.

[0734] Optionally, in the terminal, among at least one set of the received SSBs, different broadcast messages carried by each set of SSBs include different configuration information.

[0735] Optionally, the terminal, wherein the resource configuration information includes at least one of a sending period, a starting position, a duration, a subcarrier position and a subcarrier spacing.

[0736] Optionally, the terminal, wherein receiving at least one set of SSBs respectively sent by at least two cells, comprises:

[0737] At least one set of SSBs are received and respectively sent by at least two cells using at least partially identical physical cell identifiers.

[0738] Optionally, the terminal, wherein receiving at least one set of SSBs respectively sent by at least two cells, comprises:

[0739] Within a preset time period, at least one set of the SSBs sent by at least two cells with different sending rules are received.

[0740] Optionally, in the terminal, when at least two cells send at least one set of the SSB in different sending orders, the SSBs sent by at least two cells at different time points and / or different frequency domain resources are different.

[0741] One embodiment of the present invention further provides a network device, which is applied to a first network node corresponding to a first cell, such as Fig. 9 As shown, it includes a transceiver 910 and a processor 920, wherein:

[0742] The transceiver 910 is used to send the configuration information of the terminal to a second network node corresponding to at least one second cell when it is determined that the terminal needs to change the cell or before the cell change is performed, wherein the second cell is a target cell for the terminal to perform cell switching;

[0743] The processor 920 is configured to release the context of the terminal after receiving confirmation information from the second network node.

[0744] Optionally, in the network device, the transceiver 910 is further used for:

[0745] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0746] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[0747] Optionally, in the network device, the processor 920 is further configured to:

[0748] The first cell determines the time to send the SSB based on the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or based on the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal.

[0749] Optionally, in the network device, the transceiver 910 is further used for:

[0750] The first cell sends to the second network node the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal; the second network node determines the time to send the SSB.

[0751] Optionally, in the network device, the first network node and the second network node respectively include at least one of the following:

[0752] Space communication nodes;

[0753] Ground network nodes;

[0754] Wherein, the space communication node and the ground network node communicate via a first interface;

[0755] The space communication node includes at least one of the following protocol layers or functions:

[0756] Radio frequency unit;

[0757] Physical layer;

[0758] Medium Access Control MAC layer;

[0759] Radio link control RLC layer;

[0760] Packet Data Convergence Protocol PDCP layer;

[0761] Service Data Adaptation Protocol SDAP layer;

[0762] XnAP layer;

[0763] GnAP layer;

[0764] GTP-U layer;

[0765] IP layer;

[0766] F1AP layer.

[0767] Optionally, in the network device, the transceiver 910 is further used for:

[0768] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0769] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[0770] Optionally, in the network device, the processor 920 is further configured to:

[0771] Determine whether the terminal needs to change the cell according to at least one of the following information:

[0772] The location information of the terminal;

[0773] The terminal's movement speed and / or direction;

[0774] Elevation information of the terminal and space communication nodes;

[0775] the movement speed and / or direction of the space communication node;

[0776] The relative distance from the terminal to the spatial communication node or cell;

[0777] Ground network nodes and time information corresponding to space communication nodes;

[0778] ephemeris information of space communication nodes;

[0779] Orbital information of space communication nodes;

[0780] The neighboring cell / beam RSRP measurement value is greater than the configured threshold;

[0781] The RSRP measurement value of the serving cell / beam is less than the configured threshold;

[0782] Distribution of RSRP.

[0783] Optionally, in the network device, the processor 920 is further configured to: determine that the terminal needs to change the cell when at least one of the following situations is detected:

[0784] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[0785] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[0786] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[0787] Optionally, the network device, wherein sending the configuration information of the terminal to the second network node corresponding to the second cell includes at least one of the following:

[0788] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first space communication node to the second space communication node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node;

[0789] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first ground network node to the second ground network node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first space communication node to the second space communication node;

[0790] When the ground network node of the cell changes and the space communication node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node.

[0791] Optionally, in the network device, the processor 920 is further configured to perform at least one of the following:

[0792] The space communication node informs the ground network node of the capability of supporting simultaneous connection to two ground network nodes and / or the capability of supporting simultaneous maintenance of cells corresponding to different ground network nodes;

[0793] The space communication node informs the ground network node that it does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0794] The space communication node informs the ground network node whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0795] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[0796] Optionally, in the network device, the processor 920 is further configured to perform at least one of the following:

[0797] The first cell broadcasts at least one common configuration information of the second cell, the configuration information and time information used when the terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0798] The first cell broadcasts common configuration information of at least one second cell, configuration information used when a terminal or terminal group at different locations under the first cell switches to the second cell, and corresponding time information; wherein the time information includes absolute time information and / or time range information;

[0799] The first cell broadcasts random access resource information of at least one second cell; wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0800] The first cell broadcasts the moving speed and / or direction of the spatial communication node of the first cell and / or the second cell;

[0801] The first cell broadcasts the space communication nodes of the first cell and / or the second cell, the corresponding ground network nodes and time information;

[0802] The first cell broadcasts the time information required for the first space communication node of the first cell and / or the second cell to switch to the second space communication node; wherein the time information includes the start time, end time and / or switching duration of the switching;

[0803] The first cell broadcasts the ephemeris information of the space communication node of the first cell and / or the second cell;

[0804] The first cell broadcasts orbit information of the space communication node of the first cell and / or the second cell;

[0805] The first cell broadcasts a threshold value greater than the RSRP measurement value of the neighboring cell / beam that triggers cell switching;

[0806] The first cell broadcasts a threshold value that the RSRP measurement value of the serving cell / beam that triggers cell switching is less than;

[0807] The first cell broadcasts distribution information of RSRP / RSRQ / SINR of the serving cell and / or neighboring cell that triggers cell switching;

[0808] The first cell broadcasts a TA list supported by the first cell and / or the second cell;

[0809] The cell global identifier broadcast by the first cell.

[0810] Optionally, in the network device, when the first cell broadcasts a TA list supported by the first cell and / or the second cell, the processor 920 further includes at least one of the following:

[0811] The first cell broadcasts a TA list supported by the first cell and / or the second cell and time information corresponding to the TAs in the TA list;

[0812] There is a correspondence between the TA in the TA list broadcasted by the network management and received by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[0813] A correspondence between a TA in a TA list broadcasted by a network manager and received by a first network node corresponding to the first cell and a cell global identifier broadcasted by the first cell;

[0814] The correspondence between the TA in the TA list broadcast by the first cell and the cell global identifier broadcast by the first cell.

[0815] Optionally, in the network device, when the first cell broadcasts the cell global identifier broadcast by the first cell, the processor 920 further includes at least one of the following:

[0816] The first cell broadcasts at least two cell global identifiers, one of which is used for security entry and the other corresponds to the geographical location;

[0817] The first cell broadcasts m+1 cell global identifiers, one of which is used for security entry, and the other m correspond to the geographic location and time; where m is an integer greater than or equal to 1;

[0818] The cell global identifier broadcast by the first cell is different from the cell global identifier sent to the core network by the first network node corresponding to the first cell, wherein there is a corresponding relationship between the cell global identifier sent to the core network by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[0819] The cell global identifier broadcast by the first cell and the cell global identifier sent by the first network node corresponding to the first cell to the second network node corresponding to the second cell are the same as or different from each other;

[0820] A mapping table of a cell global identifier broadcasted by a first network node corresponding to the first cell and received by a network manager and sent to a core network;

[0821] When the location of the first cell changes, the global cell identifier corresponding to the geographical location is also updated;

[0822] When the location of the first cell changes, the cell global identifier corresponding to the geographical location will also be updated, but the update does not trigger a system message update;

[0823] When the location of the first cell changes, the first network node corresponding to the first cell initiates an update process to the core network and / or the second network node corresponding to the second cell.

[0824] Optionally, in the network device, the identifier of the terminal includes at least one of the following:

[0825] Temporary Mobile Subscriber Identity (IMSI);

[0826] SUPI;

[0827] SUCI;

[0828] The cell radio network temporary identifier C-RNTI of the terminal;

[0829] The truncated C-RNTI of the terminal; the recovery identification information of the terminal;

[0830] Truncated recovery identification information of the terminal;

[0831] The temporary mobile user identification code TMSI of the terminal is an offset configured by a network-side device and a unique index of the terminal in the group.

[0832] Optionally, in the network device, the processor 920 is further configured to:

[0833] Receiving the location status information of the terminal periodically reported by the terminal; and / or

[0834] The receiving terminal reports the location status information when the preset trigger condition is met.

[0835] Optionally, in the network device, the configuration information of the terminal includes at least one of the following information:

[0836] Context information of the terminal;

[0837] Hybrid automatic repeat request HARQ buffer information;

[0838] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[0839] The data to be transmitted to the terminal is obtained by the core network.

[0840] Optionally, in the network device, among at least one set of synchronization signals and physical broadcast channel blocks SSB sent, different broadcast messages carried by each set of SSB include different configuration information.

[0841] Optionally, in the network device, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB using at least partially identical physical cell identifiers.

[0842] Optionally, in the network device, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[0843] Optionally, the network device, wherein the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[0844] The embodiment of the present invention further provides a network device, which is applied to a second network node corresponding to a second cell, such as Fig.10 As shown, it includes a transceiver 1010 and a processor 1020, wherein:

[0845] The transceiver 1010 is used to receive configuration information of the terminal sent by the first cell; and

[0846] In response to the configuration information, sending confirmation information to the first cell;

[0847] The processor 1020 is configured to execute an access process of the terminal.

[0848] Optionally, in the network device, the transceiver 1010 is further used for:

[0849] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0850] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[0851] Optionally, in the network device, the transceiver 1110 is further used for:

[0852] Receiving a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node reported by the terminal and sent by the first cell, or a round-trip time RTT from the terminal to the first network node and / or a round-trip time RTT to the second network node reported by the terminal;

[0853] Determines when to send SSB.

[0854] Optionally, in the network device, the first network node and the second network node include at least one of the following:

[0855] Space communication nodes;

[0856] Ground network nodes;

[0857] Wherein, the space communication node and the ground network node communicate via a first interface;

[0858] The space communication node includes at least one of the following protocol layers or functions:

[0859] Radio frequency unit;

[0860] Physical layer;

[0861] Medium Access Control MAC layer;

[0862] Radio link control RLC layer;

[0863] Packet Data Convergence Protocol PDCP layer;

[0864] Service Data Adaptation Protocol SDAP layer;

[0865] XnAP layer;

[0866] GnAP layer;

[0867] GTP-U layer;

[0868] IP layer;

[0869] F1AP layer.

[0870] Optionally, in the network device, the transceiver 1010 is further used for:

[0871] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0872] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one first cell or is on a different synchronization grid.

[0873] Optionally, in the network device, the transceiver 1010 is further configured to perform at least one of the following:

[0874] Receive common configuration information of at least one second cell broadcast by the first cell, configuration information and time information used when a terminal in the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0875] Receive common configuration information of at least one second cell broadcast by the first cell, configuration information used when a terminal or terminal group at different locations under the first cell switches to the second cell, and corresponding time information; wherein the time information includes absolute time information and / or time range information;

[0876] Receiving random access resource information of at least one second cell broadcast by the first cell, wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0877] A moving speed and / or direction of a spatial communication node of the first cell and / or the second cell receiving broadcast of the first cell;

[0878] Receiving the spatial communication node of the first cell and / or the second cell, the corresponding ground network node and time information broadcast by the first cell;

[0879] Time information required for a first space communication node of a first cell and / or a second cell to switch to a second space communication node after receiving the broadcast of the first cell; wherein the time information includes a start time, an end time and / or a switching duration of the switching;

[0880] Receiving ephemeris information of a space communication node of the first cell and / or the second cell broadcast by the first cell;

[0881] Receiving orbit information of a space communication node of the first cell and / or the second cell broadcast by the first cell;

[0882] A threshold value of a neighboring cell / beam reference signal received power RSRP measurement value that triggers cell switching and is received by the first cell;

[0883] A serving cell / beam RSRP measurement value that triggers cell switching and is received by the first cell is less than a threshold value;

[0884] Receiving distribution information of RSRP / reference signal reception quality RSRQ / signal to interference plus noise ratio SINR of a serving cell and / or a neighboring cell that triggers cell switching broadcast by the first cell;

[0885] Receiving a TA list supported by the first cell and / or the second cell broadcasted by the first cell;

[0886] A cell global identifier broadcast by the first cell is received.

[0887] Optionally, in the network device, the identifier of the terminal includes at least one of the following:

[0888] Temporary Mobile Subscriber Identity (IMSI);

[0889] SUPI;

[0890] SUCI;

[0891] The cell radio network temporary identifier C-RNTI of the terminal;

[0892] The truncated C-RNTI of the terminal; the recovery identification information of the terminal;

[0893] Truncated recovery identification information of the terminal;

[0894] The temporary mobile user identification code TMSI of the terminal is an offset configured by a network-side device and a unique index of the terminal in the group.

[0895] Optionally, in the network device, the configuration information of the terminal includes at least one of the following information:

[0896] Context information of the terminal;

[0897] Hybrid automatic repeat request HARQ buffer information;

[0898] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[0899] The data to be transmitted to the terminal is obtained by the core network.

[0900] Optionally, in the network device, among at least one set of synchronization signals and physical broadcast channel blocks SSB sent, different broadcast messages carried by each set of SSB include different configuration information.

[0901] Optionally, in the network device, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB using at least partially identical physical cell identifiers.

[0902] Optionally, the network device, wherein, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[0903] Optionally, the network device, wherein the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[0904] The embodiment of the present invention further provides a terminal, such as Fig.11 As shown, it includes a transceiver 1110 and a processor 1120, wherein the transceiver 1110 is used for:

[0905] receiving first information for handover of the terminal sent by a first network node corresponding to the first cell;

[0906] The first information includes at least one kind of information:

[0907] Decision information for switching;

[0908] Information needed for switching;

[0909] Configuration information after switching;

[0910] The processor 1120 is configured to, according to the received first information for switching of the terminal, switch to at least one second cell;

[0911] The second network node corresponding to the second cell is a neighboring node of the first network node corresponding to the first cell.

[0912] Optionally, in the terminal, the transceiver 1110 is further used for:

[0913] Receive at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB respectively sent by second network nodes corresponding to the first cell and the second cell; wherein the second network node corresponding to the second cell is an adjacent node of the first network node corresponding to the first cell.

[0914] Optionally, in the terminal, the transceiver 1110 is further used for:

[0915] Receiving at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0916] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[0917] Optionally, in the terminal, the first network node includes at least one of the following:

[0918] Space communication nodes;

[0919] Ground network nodes;

[0920] Wherein, the space communication node and the ground network node communicate via a first interface;

[0921] The space communication node includes at least one of the following protocol layers or functions:

[0922] Radio frequency unit;

[0923] Physical layer;

[0924] Medium Access Control MAC layer;

[0925] Radio link control RLC layer;

[0926] Packet Data Convergence Protocol PDCP layer;

[0927] Service Data Adaptation Protocol SDAP layer;

[0928] XnAP layer;

[0929] GnAP layer;

[0930] GTP-U layer;

[0931] IP layer;

[0932] F1AP layer.

[0933] Optionally, the terminal, wherein

[0934] The decision information for switching includes at least one of the following information:

[0935] The location information of the terminal;

[0936] The terminal's movement speed and / or direction;

[0937] Elevation information of the terminal and space communication nodes;

[0938] the movement speed and / or direction of the space communication node;

[0939] The relative distance from the terminal to the spatial communication node or cell;

[0940] Ground network nodes and time information corresponding to space communication nodes;

[0941] ephemeris information of space communication nodes;

[0942] Orbital information of space communication nodes;

[0943] The neighboring cell / beam RSRP and / or RSRQ measurement value is greater than the configured threshold;

[0944] The RSRP and / or RSRQ measurement value of the serving cell / beam is less than the configured threshold;

[0945] The TA value of the serving cell / beam is greater than the configured threshold;

[0946] The TA value of the neighboring cell / beam is less than the configured threshold;

[0947] Distribution of RSRP.

[0948] Optionally, the terminal further includes a processor 1120, configured to: determine whether a cell change is required when the decision information for performing the handover includes detecting at least one of the following situations:

[0949] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[0950] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[0951] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[0952] Optionally, the terminal receives at least one of the following broadcasted by the spatial network node:

[0953] The space communication node supports the capability of connecting to two ground network nodes at the same time and / or supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0954] The space communication node does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[0955] Whether the space communication node supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of simultaneously maintaining cells corresponding to different ground network nodes;

[0956] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[0957] Optionally, in the terminal, the transceiver 1110 further includes at least one of the following:

[0958] Receive common configuration information of at least one second cell broadcast by the first cell and / or configuration information and time information used when a terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[0959] Receiving random access resource information of at least one second cell broadcast by the first cell, wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[0960] A moving speed and / or direction of a spatial communication node of the first cell and / or the second cell receiving broadcast of the first cell;

[0961] Receiving the spatial communication node of the first cell and / or the second cell, the corresponding ground network node and time information broadcast by the first cell;

[0962] Time information required for a first spatial communication node of a first cell to switch to a second spatial communication node corresponding to a second cell after receiving the broadcast of the first cell; wherein the time information includes a start time, an end time and / or a switching duration;

[0963] Receiving ephemeris information of a space communication node of the first cell broadcast by the first cell;

[0964] receiving orbit information of a space communication node of the first cell broadcast by the first cell;

[0965] Receive a threshold value of the neighboring cell / beam RSRP measurement value that triggers cell switching and is broadcast by the first cell;

[0966] A serving cell / beam RSRP measurement value that triggers cell switching and is received by the first cell is less than a threshold value;

[0967] Receive RSRP / RSRQ / SINR distribution information of the serving cell and / or neighboring cell that triggers cell switching broadcast by the first cell.

[0968] Optionally, the terminal further includes a processor 1120, configured to: execute at least one of the following:

[0969] The terminal randomly selects a time within a preset time range to access the second cell;

[0970] The terminal uses its own terminal identifier and the parameters broadcast by the first cell and / or notified to the terminal through dedicated RRC signaling, and obtains a time within a preset time range to access the second cell after taking a modulo.

[0971] The terminal determines a time to access the second cell using the PRACH time information notified by the first cell and a preset time value;

[0972] The terminal uses its own geographical location and the moving speed and / or direction of the spatial communication node of the second cell to determine a suitable time to access the second cell.

[0973] The embodiment of the present invention further provides a network device, which is applied to a first network node corresponding to a first cell, such as Fig.12 As shown, it includes a transceiver 1210 and a processor 1220, wherein:

[0974] The transceiver 1210 is configured to, when determining that the terminal needs to change a cell or before changing a cell, send second information for switching to a second network node corresponding to at least one second cell, wherein the second cell is a target cell for the terminal to switch the cell;

[0975] receiving third information for handover sent by a second network node corresponding to at least one second cell;

[0976] Sending first information for switching to the terminal;

[0977] The processor 1220 is configured to release the context of the terminal after receiving confirmation information of completion of the cell change sent by the second network node and / or the terminal or after a timer expires.

[0978] Optionally, in the network device, the transceiver 1210 is further used for:

[0979] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[0980] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[0981] Optionally, in the network device, the processor 1220 is further configured to:

[0982] The first cell determines the time to send the SSB based on the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or based on the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal.

[0983] Optionally, in the network device, the transceiver 1210 is further used for:

[0984] The first cell sends to the second network node the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal; the second network node determines the time to send the SSB.

[0985] Optionally, in the network device, the first network node and the second network node respectively include at least one of the following:

[0986] Space communication nodes;

[0987] Ground network nodes;

[0988] Wherein, the space communication node and the ground network node communicate via a first interface;

[0989] The space communication node includes at least one of the following protocol layers or functions:

[0990] Radio frequency unit;

[0991] Physical layer;

[0992] Medium Access Control MAC layer;

[0993] Radio link control RLC layer;

[0994] Packet Data Convergence Protocol PDCP layer;

[0995] Service Data Adaptation Protocol SDAP layer;

[0996] XnAP layer;

[0997] GnAP layer;

[0998] GTP-U layer;

[0999] IP layer;

[1000] F1AP layer.

[1001] Optionally, in the network device, the transceiver 1210 is further used for:

[1002] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1003] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[1004] Optionally, in the network device, the decision condition for the first network node to perform terminal switching and / or the evaluation condition for switching sent by the first network node to the terminal include determining whether the terminal needs to perform a cell change according to at least one of the following information:

[1005] The location information of the terminal;

[1006] The terminal's movement speed and / or direction;

[1007] Elevation information of the terminal and space communication nodes;

[1008] the movement speed and / or direction of the space communication node;

[1009] a relative distance from the terminal to the first spatial communication node or the first cell;

[1010] a relative distance from the terminal to the second spatial communication node or the second cell;

[1011] The satellite elevation angle between the terminal and the first space communication node is less than or equal to the first threshold value;

[1012] The satellite elevation angle between the terminal and the second space communication node is greater than or equal to a second threshold value;

[1013] The transmission delay between the terminal and the first spatial communication node is greater than or equal to a third threshold value;

[1014] The transmission delay between the terminal and the second spatial communication node is less than or equal to a fourth threshold value;

[1015] The transmission delay difference between the terminal and the first network node and the terminal and the second network node reaches a fifth threshold value; the ground network node and time information corresponding to the space communication node;

[1016] ephemeris information of space communication nodes;

[1017] Orbital information of space communication nodes;

[1018] The neighboring cell / beam RSRP measurement value is greater than or equal to the sixth threshold value;

[1019] The serving cell / beam RSRP measurement value is less than or equal to the seventh threshold value;

[1020] The TA value of the serving cell / beam is greater than or equal to the eighth threshold value;

[1021] The TA value of the neighboring cell / beam is less than or equal to the ninth threshold value;

[1022] The distribution of RSRP follows a certain rule.

[1023] Optionally, in the network device, the processor 1220 is further configured to: determine that the terminal needs to change the cell when at least one of the following situations is detected:

[1024] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[1025] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[1026] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[1027] Optionally, in the network device, the second information includes at least one of the following information:

[1028] UE identification;

[1029] UE QoS service characteristics and conditional switching indication;

[1030] Information related to the location of the UE;

[1031] location information and ephemeris information of the first space communication node;

[1032] elevation angle information of the terminal and the first space communication node and / or the second space communication node;

[1033] a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[1034] a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node;

[1035] The location information of the terminal;

[1036] The terminal's movement speed and / or direction;

[1037] a relative distance from the terminal to the first spatial communication node and / or the second spatial communication node;

[1038] a relative distance from the terminal to the first cell and / or the second cell;

[1039] Neighboring cell / beam RSRP and / or RSRQ measurements;

[1040] Serving cell / beam RSRP and / or RSRQ measurements;

[1041] TA value of the serving cell / beam;

[1042] TA value of neighboring cells / beams;

[1043] Distribution of RSRP.

[1044] Optionally, in the network device, the second information includes at least one of the following information:

[1045] a first ground network node and time information corresponding to the first space communication node;

[1046] ephemeris information of the first space communication node;

[1047] Orbital information of space communication nodes;

[1048] Terminal UE group identifier;

[1049] The number of terminal UEs;

[1050] Group switching indication;

[1051] Information of each terminal UE,

[1052] The information of each terminal includes at least one of the following:

[1053] UE identification, UE QoS service characteristics, UE location-related information, location information between the first space communication node, ephemeris information, elevation information between the terminal and the first space communication node and / or the second space communication node, the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node, the round-trip time RTT from the terminal to the first network node and / or to the second network node, the terminal's location information, the terminal's moving speed and / or direction, the relative distance from the terminal to the first space communication node and / or the second space communication, the relative distance from the terminal to the first cell and / or the second cell, the measured value of the RSRP and / or RSRQ of the neighboring cell / beam, the measured value of the RSRP and / or RSRQ of the serving cell / beam, the TA value of the serving cell / beam, and the distribution of the TA value and RSRP of the neighboring cell / beam.

[1054] Optionally, in the network device, the transceiver 1210 sends the second information for handover to the second network node corresponding to the at least one second cell, including:

[1055] In at least one of the following situations, the configuration information of the terminal is sent to the second network node of the second cell:

[1056] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first space communication node to the second space communication node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node;

[1057] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first ground network node to the second ground network node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first space communication node to the second space communication node;

[1058] When the ground network node of the cell changes and the space communication node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node.

[1059] Optionally, in the network device, the third information includes at least one of the following:

[1060] Conditional switching indication;

[1061] Group switching indication;

[1062] Configuration information of the terminal for use in the second cell;

[1063] Common configuration information of the terminal for group handover in the second cell and / or dedicated configuration information of the second cell;

[1064] The common configuration information of the terminal for group handover in the second cell and / or the dedicated configuration information of the second cell, the configuration information used and the time information; wherein the time information includes absolute time information and / or time range information;

[1065] Time information of switching of the terminal to access the second cell;

[1066] the movement speed and / or direction of the second spatial communication node;

[1067] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[1068] ground network node and time information corresponding to the second space communication node;

[1069] ephemeris information of a second space communication node;

[1070] orbit information of the second space communication node;

[1071] The handover evaluation condition recommended by the second spatial communication node.

[1072] Optionally, the network device, wherein:

[1073] The first information for switching includes at least one of the following:

[1074] Conditional switching indication;

[1075] Group switching indication;

[1076] Configuration information of the terminal for use in n second cells;

[1077] The terminal for group handover is used for common configuration information of n second cells and / or dedicated configuration information of the n second cells;

[1078] The terminal of the group handover is used for the common configuration information of the n second cells and / or the dedicated configuration information of the n second cells, the used configuration information and the time information; wherein the time information includes the absolute time information and / or the time range information;

[1079] Time information of switching of the terminal accessing n second cells;

[1080] the movement speed and / or direction of the second spatial communication node;

[1081] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[1082] ground network node and time information corresponding to the second space communication node;

[1083] ephemeris information of a second space communication node;

[1084] orbit information of the second space communication node;

[1085] Evaluation conditions for switching;

[1086] Wherein n is an integer greater than or equal to 1.

[1087] Optionally, in the network device, the transceiver 1210 sends the first information for switching to the terminal, including at least one of the following:

[1088] Sending first information using dedicated RRC information;

[1089] Sending the common configuration information of the second cell accessed by the terminal in the group handover in the first information by means of a broadcast message;

[1090] Sending, by broadcast message, the common configuration information of the second cell accessed by the terminal in the group handover in the first information, the configuration information and time information used when the terminal in the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[1091] Sending, by broadcast message, the common configuration information of the second cell accessed by the terminal in the group handover in the first information, the configuration information used when the terminal or terminal group at different positions under the first cell is switched to the second cell, and the corresponding time information; wherein the time information includes absolute time information and / or time range information;

[1092] Sending a dedicated signaling part of the second cell accessed by the terminal in the group handover in the first information by using dedicated signaling;

[1093] Send the configuration information of the second cell accessed by the terminals in the group by multicast, and scramble it with the G-RNTI corresponding to the group;

[1094] The configuration information of the second cell accessed by the terminals of the group is sent by multicast, and the configuration information and time information used when the terminals under the group switch to the second cell; wherein the time information includes absolute time information and / or time range information; and is encrypted with the G-RNTI corresponding to the group.

[1095] Optionally, in the network device, when the configuration information of the second cell accessed by the terminal of the group is sent in a multicast manner, the method further comprises:

[1096] The identifier of the group, the G-RNTI of the group, control information of radio resources for sending group information, and / or radio resource information for sending group information are sent to the terminals of the group.

[1097] Optionally, in the network device, when the configuration information of the second cell accessed by the terminal of the group is sent in a multicast manner, the method further comprises:

[1098] The first network node divides the terminal into groups using the terminal identifier;

[1099] The first network node divides the terminals into groups using their locations;

[1100] The first network node divides the terminal into groups by determining the time when the terminal approaches or enters the coverage of the second cell by using the geographical location of the terminal and the moving speed and / or direction of the spatial communication node of the second cell.

[1101] Optionally, in the network device, the transceiver 1310 further includes at least one of the following:

[1102] The space communication node informs the ground network node of the capability of supporting simultaneous connection to two ground network nodes and / or the capability of supporting simultaneous maintenance of cells corresponding to different ground network nodes;

[1103] The space communication node informs the ground network node that it does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[1104] The space communication node informs the ground network node whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[1105] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[1106] Optionally, in the network device, the transceiver 1210 further includes at least one of the following:

[1107] The first cell broadcasts random access resource information of at least one second cell; wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[1108] The first cell broadcasts the moving speed and / or direction of the spatial communication node of the first cell and / or the second cell;

[1109] The first cell broadcasts the space communication nodes of the first cell and / or the second cell, the corresponding ground network nodes and time information;

[1110] The first cell broadcasts the time information required for the first space communication node of the first cell and / or the second cell to switch to the second space communication node; wherein the time information includes the start time, end time and / or switching duration of the switching;

[1111] The first cell broadcasts the ephemeris information of the space communication node of the first cell and / or the second cell;

[1112] The first cell broadcasts orbit information of the space communication node of the first cell and / or the second cell;

[1113] The first cell broadcasts a threshold value greater than the RSRP measurement value of the neighboring cell / beam that triggers cell switching;

[1114] The first cell broadcasts a threshold value that the RSRP measurement value of the serving cell / beam that triggers cell switching is less than;

[1115] The first cell broadcasts distribution information of RSRP / RSRQ / SINR of the serving cell and / or neighboring cell that triggers cell switching;

[1116] The first cell broadcasts a TA list supported by the first cell and / or the second cell;

[1117] The cell global identifier broadcast by the first cell.

[1118] Optionally, in the network device, when the first cell broadcasts a TA list supported by the first cell and / or the second cell, the method further includes at least one of the following:

[1119] The first cell broadcasts a TA list supported by the first cell and / or the second cell and time information corresponding to the TAs in the TA list;

[1120] There is a correspondence between the TA in the TA list broadcasted by the network management and received by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[1121] A correspondence between a TA in a TA list broadcasted by a network manager and received by a first network node corresponding to the first cell and a cell global identifier broadcasted by the first cell;

[1122] The correspondence between the TA in the TA list broadcast by the first cell and the cell global identifier broadcast by the first cell.

[1123] Optionally, in the network device, when the first cell broadcasts the cell global identifier broadcast by the first cell, the transceiver 1210 further includes at least one of the following:

[1124] The first cell broadcasts at least two cell global identifiers, one of which is used for security entry and the other corresponds to the geographical location;

[1125] The first cell broadcasts m+1 cell global identifiers, one of which is used for security entry, and the other m correspond to the geographic location and time; where m is an integer greater than or equal to 1;

[1126] The cell global identifier broadcast by the first cell is different from the cell global identifier sent to the core network by the first network node corresponding to the first cell, wherein there is a corresponding relationship between the cell global identifier sent to the core network by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[1127] The cell global identifier broadcast by the first cell and the cell global identifier sent by the first network node corresponding to the first cell to the second network node corresponding to the second cell are the same as or different from each other;

[1128] A mapping table of a cell global identifier broadcasted by a first network node corresponding to the first cell and received by a network manager and sent to a core network;

[1129] When the location of the first cell changes, the global cell identifier corresponding to the geographical location is also updated;

[1130] When the location of the first cell changes, the cell global identifier corresponding to the geographical location will also be updated, but the update does not trigger a system message update;

[1131] When the location of the first cell changes, the first network node corresponding to the first cell initiates an update process to the core network and / or the second network node corresponding to the second cell.

[1132] Optionally, in the network device, the transceiver 1210 is further used for:

[1133] receiving the location status information of the terminal periodically reported by the terminal;

[1134] The receiving terminal reports the location status information when the preset trigger condition is met;

[1135] Reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[1136] Reporting a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node.

[1137] Optionally, in the network device, the configuration information of the terminal includes at least one of the following information:

[1138] Context information of the terminal;

[1139] Hybrid automatic repeat request HARQ buffer information;

[1140] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[1141] The data to be transmitted to the terminal is obtained by the core network.

[1142] Optionally, in the network device, in at least one set of synchronization signals and physical broadcast channel blocks SSB sent by the transceiver 1210, different broadcast messages carried by each set of SSB include different configuration information.

[1143] Optionally, in the network device, when the transceiver 1210 sends at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell use at least partially the same physical cell identifier to respectively send the SSB.

[1144] Optionally, in the network device, when the transceiver 1210 sends at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[1145] Optionally, the network device, wherein the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[1146] The embodiment of the present invention further provides a network device, which is applied to a second network node corresponding to a second cell, such as Fig.13 As shown, it includes a transceiver 1310 and a processor 1320, wherein:

[1147] The transceiver 1310 is used to receive second information for handover of a terminal sent by a first network node corresponding to a first cell; wherein the first cell is a source cell of the terminal, and the second cell is a target cell for cell handover of the terminal;

[1148] sending third information for switching to the first network node according to the second information;

[1149] The processor 1320 is configured to execute an access process of the terminal.

[1150] Optionally, in the network device, the transceiver 1310 is further used for:

[1151] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1152] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one first cell.

[1153] Optionally, in the network device, the transceiver 1310 is further used for:

[1154] Receiving a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node reported by the terminal and sent by the first cell, or a round-trip time RTT from the terminal to the first network node and / or a round-trip time RTT to the second network node reported by the terminal;

[1155] Determines when to send SSB.

[1156] Optionally, in the network device, the first network node and the second network node respectively include at least one of the following:

[1157] Space communication nodes;

[1158] Ground network nodes;

[1159] Wherein, the space communication node and the ground network node communicate via a first interface;

[1160] The space communication node includes at least one of the following protocol layers or functions:

[1161] Radio frequency unit;

[1162] Physical layer;

[1163] Medium Access Control MAC layer;

[1164] Radio link control RLC layer;

[1165] Packet Data Convergence Protocol PDCP layer;

[1166] Service Data Adaptation Protocol SDAP layer;

[1167] XnAP layer;

[1168] GnAP layer;

[1169] GTP-U layer;

[1170] IP layer;

[1171] F1AP layer.

[1172] Optionally, in the network device, the transceiver 1310 is further used for:

[1173] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1174] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[1175] Optionally, in the network device, the second information includes at least one of the following information:

[1176] UE identification;

[1177] UE QoS service characteristics and conditional switching indication;

[1178] Information related to the location of the UE;

[1179] location information and ephemeris information of the first space communication node;

[1180] elevation angle information of the terminal and the first space communication node and / or the second space communication node;

[1181] a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[1182] a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node;

[1183] The location information of the terminal;

[1184] The terminal's movement speed and / or direction;

[1185] a relative distance from the terminal to the first spatial communication node and / or the second spatial communication node;

[1186] a relative distance from the terminal to the first cell and / or the second cell;

[1187] Neighboring cell / beam RSRP and / or RSRQ measurements;

[1188] Serving cell / beam RSRP and / or RSRQ measurements;

[1189] TA value of the serving cell / beam;

[1190] TA value of neighboring cells / beams;

[1191] Distribution of RSRP.

[1192] Optionally, in the network device, the second information includes at least one of the following information:

[1193] a first ground network node and time information corresponding to the first space communication node;

[1194] ephemeris information of the first space communication node;

[1195] Orbital information of space communication nodes;

[1196] Terminal UE group identifier;

[1197] The number of terminal UEs;

[1198] Group switching indication;

[1199] Information of each terminal UE,

[1200] The information of each terminal includes at least one of the following:

[1201] UE identification, UE QoS service characteristics, UE location-related information, location information between the first space communication node, ephemeris information, elevation information between the terminal and the first space communication node and / or the second space communication node, the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node, the round-trip time RTT from the terminal to the first network node and / or to the second network node, the terminal's location information, the terminal's moving speed and / or direction, the relative distance from the terminal to the first space communication node and / or the second space communication, the relative distance from the terminal to the first cell and / or the second cell, the measured value of the RSRP and / or RSRQ of the neighboring cell / beam, the measured value of the RSRP and / or RSRQ of the serving cell / beam, the TA value of the serving cell / beam, and the distribution of the TA value and RSRP of the neighboring cell / beam.

[1202] Optionally, in the network device, the third information includes at least one of the following:

[1203] Conditional switching indication;

[1204] Group switching indication;

[1205] Configuration information of the terminal for use in the second cell;

[1206] Common configuration information of the terminal for group handover in the second cell and / or dedicated configuration information of the second cell;

[1207] The common configuration information of the terminal for group handover in the second cell and / or the dedicated configuration information of the second cell, the configuration information used and the time information; wherein the time information includes absolute time information and / or time range information;

[1208] Time information of switching of the terminal to access the second cell;

[1209] the movement speed and / or direction of the second spatial communication node;

[1210] The relative distance from the terminal that meets the switching conditions to the spatial communication node or cell;

[1211] ground network node and time information corresponding to the second space communication node;

[1212] ephemeris information of a second space communication node;

[1213] orbit information of the second space communication node;

[1214] The handover evaluation condition recommended by the second spatial communication node.

[1215] The embodiment of the present invention further provides a switching device, which is applied to a terminal, such as Fig.14 As shown, the device comprises:

[1216] The transceiver module 1410 is used to receive at least one set of identical synchronization signals and physical broadcast channel blocks SSB sent by at least two cells respectively; the two cells are from two network nodes; wherein the first network node is the source node of the terminal, and the second network node is an adjacent node of the first network node.

[1217] Optionally, in the switching device, the transceiver module 1410 is further configured to perform at least one of the following:

[1218] Periodically reporting the location status information of the terminal;

[1219] When a preset trigger condition is met, reporting the location status information of the terminal;

[1220] Reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay from the terminal to the second network node;

[1221] Reporting a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node.

[1222] Optionally, in the switching device, the preset trigger condition includes at least one of the following:

[1223] The distance between the terminal and the first network node is greater than or equal to a first threshold;

[1224] The distance between the terminal and the second network node is less than or equal to a second threshold.

[1225] Optionally, in the switching device, among at least one set of the received SSBs, different broadcast messages carried by each set of SSBs include different configuration information.

[1226] Optionally, in the switching device, the resource configuration information includes at least one of a sending period, a starting position, a duration, a subcarrier position and a subcarrier spacing.

[1227] Optionally, the switching device, wherein receiving at least one set of SSBs respectively sent by at least two cells, comprises:

[1228] At least one set of SSBs are received and respectively sent by at least two cells using at least partially identical physical cell identifiers.

[1229] Optionally, the switching device, wherein receiving at least one set of SSBs respectively sent by at least two cells, comprises:

[1230] Within a preset time period, at least one set of the SSBs sent by at least two cells with different sending rules are received.

[1231] Optionally, in the switching device, when at least two cells send at least one set of the SSB in different sending orders, the SSBs sent by at least two cells at different time points and / or different frequency domain resources are different.

[1232] The embodiment of the present invention further provides a switching device, which is applied to a first network node corresponding to a first cell, such as Fig.15 As shown, the device comprises:

[1233] The sending module 1510 is configured to send the configuration information of the terminal to a second network node corresponding to at least one second cell when it is determined that the terminal needs to change the cell or before the cell change is performed, wherein the second cell is a target cell for the terminal to perform cell switching;

[1234] The processing module 1520 is configured to release the context of the terminal after receiving the confirmation information from the network node.

[1235] Optionally, in the switching device, the sending module 1510 is further used for:

[1236] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1237] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[1238] Optionally, in the switching device, the processing module 1520 is further configured to:

[1239] The first cell determines the time to send the SSB based on the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or based on the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal.

[1240] Optionally, in the switching device, the sending module 1510 is further used for:

[1241] The first cell sends to the second network node the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal; the second network node determines the time to send the SSB.

[1242] Optionally, in the switching device, the first network node and the second network node respectively include at least one of the following:

[1243] Space communication nodes;

[1244] Ground network nodes;

[1245] Wherein, the space communication node and the ground network node communicate via a first interface;

[1246] The space communication node includes at least one of the following protocol layers or functions:

[1247] Radio frequency unit;

[1248] Physical layer;

[1249] Medium Access Control MAC layer;

[1250] Radio link control RLC layer;

[1251] Packet Data Convergence Protocol PDCP layer;

[1252] Service Data Adaptation Protocol SDAP layer;

[1253] XnAP layer;

[1254] GnAP layer;

[1255] GTP-U layer;

[1256] IP layer;

[1257] F1AP layer.

[1258] Optionally, in the switching device, the sending module 1510 is further used for:

[1259] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1260] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[1261] Optionally, in the switching device, the processing module 1520 is further configured to:

[1262] Determine whether the terminal needs to change the cell according to at least one of the following information:

[1263] The location information of the terminal;

[1264] The terminal's movement speed and / or direction;

[1265] Elevation information of the terminal and space communication nodes;

[1266] the movement speed and / or direction of the space communication node;

[1267] The relative distance from the terminal to the spatial communication node or cell;

[1268] Ground network nodes and time information corresponding to space communication nodes;

[1269] ephemeris information of space communication nodes;

[1270] Orbital information of space communication nodes;

[1271] The neighboring cell / beam RSRP measurement value is greater than the configured threshold;

[1272] The RSRP measurement value of the serving cell / beam is less than the configured threshold;

[1273] Distribution of RSRP.

[1274] Optionally, in the switching device, the processing module 1520 is further configured to: determine that the terminal needs to change the cell when at least one of the following situations is detected:

[1275] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[1276] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[1277] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[1278] Optionally, in the switching device, sending the configuration information of the terminal to the network node of the second cell includes at least one of the following:

[1279] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first space communication node to the second space communication node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node;

[1280] When the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first ground network node to the second ground network node; or when the cell of the first space communication node changes to the cell of the second space communication node and the ground network node also changes, the configuration information of the terminal is sent from the first space communication node to the second space communication node;

[1281] When the ground network node of the cell changes and the space communication node does not change, the configuration information of the terminal is sent from the first ground network node to the second ground network node.

[1282] Optionally, in the switching device, the processing module 1520 is further configured to perform at least one of the following:

[1283] The space network node informs the ground network node of the capability of supporting simultaneous connection to two ground network nodes and / or the capability of supporting simultaneous maintenance of cells corresponding to different ground network nodes;

[1284] The space network node informs the ground network node that it does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[1285] The space network node informs the ground network node whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[1286] The spatial network node broadcasts whether it supports the capability of connecting to two terrestrial network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different terrestrial network nodes at the same time.

[1287] Optionally, in the switching device, the processing module 1520 is further configured to perform at least one of the following:

[1288] The first cell broadcasts at least one common configuration information of the second cell, the configuration information and time information used when the terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[1289] The first cell broadcasts common configuration information of at least one second cell, configuration information used when a terminal or terminal group at different locations under the first cell switches to the second cell, and corresponding time information; wherein the time information includes absolute time information and / or time range information;

[1290] The first cell broadcasts random access resource information of at least one second cell; wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[1291] The first cell broadcasts the moving speed and / or direction of the spatial communication node of the first cell and / or the second cell;

[1292] The first cell broadcasts the space communication nodes of the first cell and / or the second cell, the corresponding ground network nodes and time information;

[1293] The first cell broadcasts the time information required for the first space communication node of the first cell and / or the second cell to switch to the second space communication node; wherein the time information includes the start time, end time and / or switching duration of the switching;

[1294] The first cell broadcasts the ephemeris information of the space communication node of the first cell and / or the second cell;

[1295] The first cell broadcasts orbit information of the space communication node of the first cell and / or the second cell;

[1296] The first cell broadcasts a threshold value greater than the RSRP measurement value of the neighboring cell / beam that triggers cell switching;

[1297] The first cell broadcasts a threshold value that the RSRP measurement value of the serving cell / beam that triggers cell switching is less than;

[1298] The first cell broadcasts distribution information of RSRP / RSRQ / SINR of the serving cell and / or neighboring cell that triggers cell switching;

[1299] The first cell broadcasts a TA list supported by the first cell and / or the second cell;

[1300] The cell global identifier broadcast by the first cell.

[1301] Optionally, in the switching device, when the first cell broadcasts a TA list supported by the first cell and / or the second cell, the processing module 1520 further includes at least one of the following:

[1302] The first cell broadcasts a TA list supported by the first cell and / or the second cell and time information corresponding to the TAs in the TA list;

[1303] There is a correspondence between the TA in the TA list broadcasted by the network management and received by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[1304] A correspondence between a TA in a TA list broadcasted by a network manager and received by a first network node corresponding to the first cell and a cell global identifier broadcasted by the first cell;

[1305] The correspondence between the TA in the TA list broadcast by the first cell and the cell global identifier broadcast by the first cell.

[1306] Optionally, in the switching device, when the first cell broadcasts the cell global identifier broadcast by the first cell, the processing module 1520 further includes at least one of the following:

[1307] The first cell broadcasts at least two cell global identifiers, one of which is used for security entry and the other corresponds to the geographical location;

[1308] The first cell broadcasts m+1 cell global identifiers, one of which is used for security entry, and the other m correspond to the geographic location and time; where m is an integer greater than or equal to 1;

[1309] The cell global identifier broadcast by the first cell is different from the cell global identifier sent to the core network by the first network node corresponding to the first cell, wherein there is a corresponding relationship between the cell global identifier sent to the core network by the first network node corresponding to the first cell and the geographical location or geographical coverage;

[1310] The cell global identifier broadcast by the first cell and the cell global identifier sent by the first network node corresponding to the first cell to the second network node corresponding to the second cell are the same as or different from each other;

[1311] A mapping table of a cell global identifier broadcasted by a first network node corresponding to the first cell and received by a network manager and sent to a core network;

[1312] When the location of the first cell changes, the global cell identifier corresponding to the geographical location is also updated;

[1313] When the location of the first cell changes, the cell global identifier corresponding to the geographical location will also be updated, but the update does not trigger a system message update;

[1314] When the location of the first cell changes, the first network node corresponding to the first cell initiates an update process to the core network and / or the second network node corresponding to the second cell.

[1315] Optionally, in the switching device, the identifier of the terminal includes at least one of the following:

[1316] Temporary Mobile Subscriber Identity (IMSI);

[1317] SUPI;

[1318] SUCI;

[1319] The cell radio network temporary identifier C-RNTI of the terminal;

[1320] The truncated C-RNTI of the terminal; the recovery identification information of the terminal;

[1321] Truncated recovery identification information of the terminal;

[1322] The temporary mobile user identification code TMSI of the terminal is an offset configured by a network-side device and a unique index of the terminal in the group.

[1323] Optionally, in the switching device, the processing module 1520 is further configured to:

[1324] Receiving the location status information of the terminal periodically reported by the terminal; and / or

[1325] The receiving terminal reports the location status information when the preset trigger condition is met.

[1326] Optionally, in the switching device, the configuration information of the terminal includes at least one of the following information:

[1327] Context information of the terminal;

[1328] Hybrid automatic repeat request HARQ buffer information;

[1329] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[1330] The data to be transmitted to the terminal is obtained by the core network.

[1331] Optionally, in the switching device, among at least one set of synchronization signals and physical broadcast channel blocks SSB sent, different broadcast messages carried by each set of SSB include different configuration information.

[1332] Optionally, in the switching device, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell use at least partially the same physical cell identifier to respectively send the SSB.

[1333] Optionally, in the switching device, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[1334] Optionally, the switching device, wherein the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[1335] The embodiment of the present invention further provides a switching device, which is applied to a second network node corresponding to a second cell, such as Fig.16 As shown, the device comprises:

[1336] The configuration receiving module 1610 is used to receive the configuration information of the terminal sent by the first cell;

[1337] A response module 1620 is used to respond to the configuration information and send confirmation information to the first cell;

[1338] The execution module 1630 is used to execute the access process of the terminal.

[1339] Optionally, in the switching device, the execution module 1630 is further configured to:

[1340] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1341] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[1342] Optionally, in the switching device, the response module 1620 is further configured to:

[1343] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1344] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one first cell.

[1345] Optionally, in the switching device, the response module 1620 is further configured to:

[1346] Receiving a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node reported by the terminal and sent by the first cell, or a round-trip time RTT from the terminal to the first network node and / or a round-trip time RTT to the second network node reported by the terminal;

[1347] Determines when to send SSB.

[1348] Optionally, in the switching device, the first network node and the second network node include at least one of the following:

[1349] Space communication nodes;

[1350] Ground network nodes;

[1351] Wherein, the space communication node and the ground network node communicate via a first interface;

[1352] The space communication node includes at least one of the following protocol layers or functions:

[1353] Radio frequency unit;

[1354] Physical layer;

[1355] Medium Access Control MAC layer;

[1356] Radio link control RLC layer;

[1357] Packet Data Convergence Protocol PDCP layer;

[1358] Service Data Adaptation Protocol SDAP layer;

[1359] XnAP layer;

[1360] GnAP layer;

[1361] GTP-U layer;

[1362] IP layer;

[1363] F1AP layer.

[1364] Optionally, in the switching device, the response module 1620 is further configured to:

[1365] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1366] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one first cell or is on a different synchronization grid.

[1367] Optionally, in the switching device, the execution module 1630 is further configured to execute at least one of the following:

[1368] receiving, by a first cell, public configuration information of at least one second cell broadcasted by the first cell, configuration information and time information used when a terminal in the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[1369] Receive common configuration information of at least one second cell broadcast by the first cell, configuration information used when a terminal or terminal group at different locations under the first cell switches to the second cell, and corresponding time information; wherein the time information includes absolute time information and / or time range information;

[1370] Receiving random access resource information of at least one second cell broadcast by the first cell, wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[1371] A moving speed and / or direction of a spatial communication node of the first cell and / or the second cell receiving broadcast of the first cell;

[1372] Receiving the spatial communication node of the first cell and / or the second cell, the corresponding ground network node and time information broadcast by the first cell;

[1373] Time information required for a first space communication node of a first cell and / or a second cell to switch to a second space communication node after receiving the broadcast of the first cell; wherein the time information includes a start time, an end time and / or a switching duration of the switching;

[1374] Receiving ephemeris information of a space communication node of the first cell and / or the second cell broadcast by the first cell;

[1375] Receiving orbit information of a space communication node of the first cell and / or the second cell broadcast by the first cell;

[1376] A threshold value of a neighboring cell / beam reference signal received power RSRP measurement value that triggers cell switching and is received by the first cell;

[1377] A serving cell / beam RSRP measurement value that triggers cell switching and is received by the first cell is less than a threshold value;

[1378] Receive distribution information of RSRP / reference signal reception quality RSRQ / signal to interference plus noise ratio SINR of the serving cell and / or neighboring cell that triggers cell switching broadcast by the first cell.

[1379] Optionally, in the switching device, the configuration information of the terminal includes at least one of the following information:

[1380] Context information of the terminal;

[1381] Hybrid automatic repeat request HARQ buffer information;

[1382] Buffer information of Packet Data Convergence Protocol PDCP / Radio Link Control Protocol RLC;

[1383] data to be transmitted to the terminal obtained by the core network;

[1384] Receiving a TA list supported by the first cell and / or the second cell broadcasted by the first cell;

[1385] A cell global identifier broadcast by the first cell is received.

[1386] Optionally, in the switching device, the identifier of the terminal includes at least one of the following:

[1387] Temporary Mobile Subscriber Identity (IMSI);

[1388] SUPI;

[1389] SUCI;

[1390] The cell radio network temporary identifier C-RNTI of the terminal;

[1391] The truncated C-RNTI of the terminal; the recovery identification information of the terminal;

[1392] Truncated recovery identification information of the terminal;

[1393] The temporary mobile user identification code TMSI of the terminal is an offset configured by a network-side device and a unique index of the terminal in the group.

[1394] Optionally, in the switching device, among at least one set of synchronization signals and physical broadcast channel blocks SSB sent, different broadcast messages carried by each set of SSB include different configuration information.

[1395] Optionally, in the switching device, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell use at least partially the same physical cell identifier to respectively send the SSB.

[1396] Optionally, the switching device, wherein, when sending at least one set of synchronization signals and physical broadcast channel blocks SSB, the first cell and the second cell respectively send the SSB with different sending rules.

[1397] Optionally, the switching device, wherein the SSBs sent by the first cell and the second cell at different time points and / or different frequency domain resources are different.

[1398] The embodiment of the present invention further provides a switching device, which is applied to a terminal, such as Fig.17 As shown, the device comprises:

[1399] The information receiving module 1710 is configured to receive first information for handover of the terminal sent by a first network node corresponding to a first cell;

[1400] The first information includes at least one kind of information:

[1401] Decision information for switching;

[1402] Information needed for switching;

[1403] Configuration information after switching;

[1404] A switching module 1720, configured to switch to at least one second cell according to the received first information for switching of the terminal;

[1405] The second network node corresponding to the second cell is a neighboring node of the first network node corresponding to the first cell.

[1406] Optionally, in the switching device, the information receiving module 1710 is further used for:

[1407] Receive at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB respectively sent by second network nodes corresponding to the first cell and the second cell; wherein the second network node corresponding to the second cell is an adjacent node of the first network node corresponding to the first cell.

[1408] Optionally, in the switching device, the information receiving module 1710 is further used for:

[1409] Receiving at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1410] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[1411] Optionally, in the switching device, the first network node includes at least one of the following:

[1412] Space communication nodes;

[1413] Ground network nodes;

[1414] Wherein, the space communication node and the ground network node communicate via a first interface;

[1415] The space communication node includes at least one of the following protocol layers or functions:

[1416] Radio frequency unit;

[1417] Physical layer;

[1418] Medium Access Control MAC layer;

[1419] Radio link control RLC layer;

[1420] Packet Data Convergence Protocol PDCP layer;

[1421] Service Data Adaptation Protocol SDAP layer;

[1422] XnAP layer;

[1423] GnAP layer;

[1424] GTP-U layer;

[1425] IP layer;

[1426] F1AP layer.

[1427] Optionally, the switching device, wherein:

[1428] The decision information for switching includes at least one of the following information:

[1429] The location information of the terminal;

[1430] The terminal's movement speed and / or direction;

[1431] Elevation information of the terminal and space communication nodes;

[1432] the movement speed and / or direction of the space communication node;

[1433] The relative distance from the terminal to the spatial communication node or cell;

[1434] Ground network nodes and time information corresponding to space communication nodes;

[1435] ephemeris information of space communication nodes;

[1436] Orbital information of space communication nodes;

[1437] The neighboring cell / beam RSRP and / or RSRQ measurement value is greater than the configured threshold;

[1438] The RSRP and / or RSRQ measurement value of the serving cell / beam is less than the configured threshold;

[1439] The TA value of the serving cell / beam is greater than the configured threshold;

[1440] The TA value of the neighboring cell / beam is less than the configured threshold;

[1441] Distribution of RSRP.

[1442] Optionally, in the switching device, the decision information for switching includes determining whether a cell change is required when at least one of the following situations is detected:

[1443] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node does not change;

[1444] The cell of the first space communication node changes to the cell of the second space communication node, and the ground network node also changes;

[1445] The ground network nodes of the cell have changed, but the space communication nodes have not changed.

[1446] Optionally, in the switching device, the terminal receives at least one of the following broadcasted by the spatial network node:

[1447] The space communication node supports the capability of connecting to two ground network nodes at the same time and / or supports the capability of maintaining cells corresponding to different ground network nodes at the same time;

[1448] The space communication node does not support the capability of connecting to two ground network nodes at the same time and / or does not support the capability of maintaining cells corresponding to different ground network nodes at the same time;

[1449] Whether the space communication node supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of simultaneously maintaining cells corresponding to different ground network nodes;

[1450] The space communication node broadcasts whether it supports the capability of connecting to two ground network nodes at the same time and / or whether it supports the capability of maintaining cells corresponding to different ground network nodes at the same time.

[1451] Optionally, in the switching device, the information receiving module 1710 is further configured to perform at least one of the following:

[1452] Receive common configuration information of at least one second cell broadcast by the first cell and / or configuration information and time information used when a terminal under the first cell switches to the second cell; wherein the time information includes absolute time information and / or time range information;

[1453] Receiving random access resource information of at least one second cell broadcast by the first cell, wherein the random access resource information of the second cell corresponds to an identifier of the terminal;

[1454] A moving speed and / or direction of a spatial communication node of the first cell and / or the second cell receiving broadcast of the first cell;

[1455] Receiving the spatial communication node of the first cell and / or the second cell, the corresponding ground network node and time information broadcast by the first cell;

[1456] Time information required for a first spatial communication node of a first cell to switch to a second spatial communication node corresponding to a second cell after receiving the broadcast of the first cell; wherein the time information includes a start time, an end time and / or a switching duration;

[1457] Receiving ephemeris information of a space communication node of the first cell broadcast by the first cell;

[1458] receiving orbit information of a space communication node of the first cell broadcast by the first cell;

[1459] Receive a threshold value of the neighboring cell / beam RSRP measurement value that triggers cell switching and is broadcast by the first cell;

[1460] A serving cell / beam RSRP measurement value that triggers cell switching and is received by the first cell is less than a threshold value;

[1461] Receive RSRP / RSRQ / SINR distribution information of the serving cell and / or neighboring cell that triggers cell switching broadcast by the first cell.

[1462] Optionally, in the switching device, the information receiving module 1710 is further configured to perform at least one of the following:

[1463] The terminal randomly selects a time within a preset time range to access the second cell;

[1464] The terminal uses its own terminal identifier and the parameters broadcast by the first cell and / or notified to the terminal through dedicated RRC signaling, and obtains a time within a preset time range to access the second cell after taking a modulo.

[1465] The terminal determines a time to access the second cell using the PRACH time information notified by the first cell and a preset time value;

[1466] The terminal uses its own geographical location and the moving speed and / or direction of the spatial communication node of the second cell to determine a suitable time to access the second cell.

[1467] The embodiment of the present invention further provides a switching device, which is applied to a first network node corresponding to a first cell, such as Fig.18 As shown, the device comprises:

[1468] The first information sending module 1810 is configured to send second information for switching to a second network node corresponding to at least one second cell when it is determined that the terminal needs to change the cell or before the cell is changed, wherein the second cell is a target cell for the terminal to switch the cell;

[1469] The information receiving module 1820 is configured to receive third information for handover sent by a second network node corresponding to at least one second cell;

[1470] The second information sending module 1830 is used to send first information for switching to the terminal;

[1471] The processing module 1840 is configured to release the context of the terminal after receiving confirmation information of completion of the cell change sent by the second network node and / or the terminal or after a timer times out.

[1472] Optionally, in the switching device, the first information sending module 1810 is further used for:

[1473] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1474] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one second cell.

[1475] Optionally, in the switching device, the processing module 1840 is further configured to:

[1476] The first cell determines the time to send the SSB based on the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or based on the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal.

[1477] Optionally, in the switching device, the first information sending module 1810 is further used for:

[1478] The first cell sends to the second network node the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node reported by the terminal, or the round-trip time RTT from the terminal to the first network node and / or the round-trip time RTT to the second network node reported by the terminal; the second network node determines the time to send the SSB.

[1479] Optionally, in the switching device, the first information sending module 1810 is further used for:

[1480] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1481] The at least one PCI or at least one set of SSB sent is different from the at least one PCI or at least one set of SSB sent by at least one second cell or is on a different synchronization grid.

[1482] Optionally, in the switching device, the decision condition for the first network node to perform terminal switching and / or the switching evaluation condition sent by the first network node to the terminal include determining whether the terminal needs to perform a cell change according to at least one of the following information:

[1483] The location information of the terminal;

[1484] The terminal's movement speed and / or direction;

[1485] Elevation information of the terminal and space communication nodes;

[1486] the movement speed and / or direction of the space communication node;

[1487] a relative distance from the terminal to the first spatial communication node or the first cell;

[1488] a relative distance from the terminal to the second spatial communication node or the second cell;

[1489] The satellite elevation angle between the terminal and the first space communication node is less than or equal to the first threshold value;

[1490] The satellite elevation angle between the terminal and the second space communication node is greater than or equal to a second threshold value;

[1491] The transmission delay between the terminal and the first spatial communication node is greater than or equal to a third threshold value;

[1492] The transmission delay between the terminal and the second spatial communication node is less than or equal to a fourth threshold value;

[1493] The transmission delay difference between the terminal and the first network node and the terminal and the second network node reaches a fifth threshold value; the ground network node and time information corresponding to the space communication node;

[1494] ephemeris information of space communication nodes;

[1495] Orbital information of space communication nodes;

[1496] The neighboring cell / beam RSRP measurement value is greater than or equal to the sixth threshold value;

[1497] The serving cell / beam RSRP measurement value is less than or equal to the seventh threshold value;

[1498] The TA value of the serving cell / beam is greater than or equal to the eighth threshold value;

[1499] The TA value of the neighboring cell / beam is less than or equal to the ninth threshold value;

[1500] The distribution of RSRP follows a certain rule.

[1501] The embodiment of the present invention further provides a switching device, which is applied to a second network node corresponding to a second cell, such as Fig.19 As shown, the device comprises:

[1502] The information receiving module 1910 is configured to receive second information for handover of a terminal sent by a first network node corresponding to a first cell; wherein the first cell is a source cell of the terminal, and the second cell is a target cell for cell handover of the terminal;

[1503] An information sending module 1920 is configured to send third information for switching to the first network node according to the second information;

[1504] The processing module 1930 is used to execute the access process of the terminal.

[1505] Optionally, in the switching device, the information sending module 2020 is further used for:

[1506] Sending at least one physical cell identifier PCI or at least one set of synchronization signals and physical broadcast channel blocks SSB;

[1507] Among them, at least one PCI or at least one set of SSB sent is the same as at least one PCI or at least one set of SSB sent by at least one first cell.

[1508] Optionally, in the switching device, the information receiving module 2010 is further used for:

[1509] Receiving a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node reported by the terminal and sent by the first cell, or a round-trip time RTT from the terminal to the first network node and / or a round-trip time RTT to the second network node reported by the terminal;

[1510] Determines when to send SSB.

[1511] Another aspect of the present invention is to provide a network device, such as Fig. 20 As shown, the network device includes: a processor 2001; and a memory 2003 connected to the processor 2001 via a bus interface 2002, the memory 2003 is used to store programs and data used by the processor 2001 when performing operations, and the processor 2001 calls and executes the programs and data stored in the memory 2003.

[1512] Among them, the transceiver 2004 is connected to the bus interface 2002, and is used to receive and send data under the control of the processor 2001. Specifically, the processor 2001 is used to read the program in the memory 2003 and execute the process of the switching method described in any of the above-mentioned implementation methods. Specifically, the process of the switching method of the corresponding terminal, the first cell and the second cell can be executed respectively, which will not be described in detail here.

[1513] Among them, Fig. 20In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 2001 and memory represented by memory 2003. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 2004 may be a plurality of components, i.e., including a transmitter and a receiver, providing a unit for communicating with various other devices on a transmission medium. The processor 2001 is responsible for managing the bus architecture and general processing, and the memory 2003 may store data used by the processor 2001 when performing operations.

[1514] A specific embodiment of the present invention further provides a readable storage medium on which a program is stored, wherein the program, when executed by a processor, implements the steps in any one of the switching methods described above.

[1515] Specifically, the readable storage medium can be applied to one of the above-mentioned terminal, the first cell and the second cell. When applied to the terminal, the first cell or the second cell, the execution steps in the corresponding switching method are described in detail above and will not be repeated here.

[1516] In the several embodiments provided in the present application, it should be understood that the disclosed methods and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[1517] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may be physically included separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of hardware plus software functional units.

[1518] The above-mentioned integrated unit implemented in the form of a software functional unit can be stored in a computer-readable storage medium. The above-mentioned software functional unit is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform some steps of the sending and receiving methods described in various embodiments of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (Read-Only Memory, referred to as ROM), random access memory (Random Access Memory, referred to as RAM), disk or optical disk and other media that can store program codes.

[1519] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary personnel in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A switching method, applied to a terminal, characterized in that: The method comprises: Receiving at least one set of synchronization signals and physical broadcast channel blocks SSB respectively sent by at least two cells using at least partially identical physical cell identifiers; the two cells are from two network nodes of a non-terrestrial network NTN; wherein the first network node is a source node of the terminal, and the second network node is an adjacent node of the first network node; reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node; wherein the time at which the at least two cells respectively send at least one set of the SSB is determined according to the transmission delay difference; The receiving at least one set of SSBs respectively sent by at least two cells using at least partially identical physical cell identifiers includes: Within a preset time period, receiving at least one set of the SSBs respectively sent by at least two cells using at least partially identical physical cell identifiers with different sending rules; Among them, when at least two cells send at least one set of SSBs with different sending rules, the SSBs sent by at least two cells at different time points and / or different frequency domain resources are different.

2. The switching method according to claim 1, characterized in that: The method further comprises at least one of the following: Periodically reporting the location status information of the terminal; When a preset trigger condition is met, reporting the location status information of the terminal; Reporting a round trip time RTT from the terminal to the first network node and / or a round trip time RTT from the terminal to the second network node.

3. The switching method according to claim 2, characterized in that: The preset trigger condition includes at least one of the following: The distance between the terminal and the first network node is greater than or equal to a first threshold; The distance between the terminal and the second network node is less than or equal to a second threshold.

4. The switching method according to claim 1, characterized in that: In at least one set of the received SSBs, different broadcast messages carried by each set of SSBs include different configuration information.

5. The switching method according to claim 4, characterized in that: The configuration information includes at least one of a transmission period, a start position, a duration, a subcarrier position, and a subcarrier spacing.

6. A terminal, comprising a transceiver, characterized in that: The transceiver is used for: Receiving at least one set of synchronization signals and physical broadcast channel blocks SSB respectively sent by at least two cells using at least partially identical physical cell identifiers; the two cells are from two network nodes of a non-terrestrial network NTN; wherein the first network node is a source node of the terminal, and the second network node is an adjacent node of the first network node; Reporting a transmission delay difference between a transmission delay from the terminal to the first network node and a transmission delay to the second network node; wherein the time at which the at least two cells respectively send at least one set of the SSB is determined according to the transmission delay difference; The transceiver receives at least one set of SSBs respectively sent by at least two cells using at least partially identical physical cell identifiers, including: Within a preset time period, receiving at least one set of the SSBs respectively sent by at least two cells using at least partially identical physical cell identifiers with different sending rules; Among them, when at least two cells send at least one set of SSBs with different sending rules, the SSBs sent by at least two cells at different time points and / or different frequency domain resources are different.

7. A switching device, applied to a terminal, characterized in that: The device comprises: A transceiver module, configured to receive at least one set of synchronization signals and physical broadcast channel blocks (SSBs) respectively sent by at least two cells using at least partially identical physical cell identifiers; the two cells are from two network nodes of a non-terrestrial network (NTN); wherein the first network node is a source node of the terminal, and the second network node is an adjacent node of the first network node; and, Used to report the transmission delay difference between the transmission delay from the terminal to the first network node and the transmission delay to the second network node; wherein the time when the at least two cells respectively send at least one set of the SSB is determined according to the transmission delay difference; The transceiver module receives at least one set of SSBs respectively sent by at least two cells using at least partially identical physical cell identifiers, including: Within a preset time period, receiving at least one set of the SSBs respectively sent by at least two cells using at least partially identical physical cell identifiers with different sending rules; Among them, when at least two cells send at least one set of SSBs with different sending rules, the SSBs sent by at least two cells at different time points and / or different frequency domain resources are different.

8. A network device, characterized in that: include: A processor, a memory, and a program stored in the memory and executable on the processor, wherein the program, when executed by the processor, implements the switching method according to any one of claims 1 to 5.

9. A readable storage medium, characterized in that: The readable storage medium stores a program, and when the program is executed by a processor, the steps in the switching method according to any one of claims 1 to 5 are implemented.

Images