Cell reselection method for integrated air-space-ground network, communication system and related device

Abstract

The present disclosure relates to wireless communication technology, and provides a cell reselection method, a communication system and a related device in an air-space-ground integrated network. The method includes: a terminal listens to a broadcast message, obtains coverage information of a current resident cell and a neighboring cell from the broadcast message, and determines whether the current resident cell and the neighboring cell are non-terrestrial network cells or land network cells; if the current resident cell is a non-terrestrial network cell, the terminal determines positional relationship information between the terminal and the current resident cell based on the coverage information of the current resident cell, and triggers cell reselection measurement based on the positional relationship information between the terminal and the current resident cell; if the current resident cell is a land network cell, the terminal triggers cell reselection measurement based on the radio signal strength of the current resident cell; and the terminal performs cell reselection based on a cell reselection measurement result. Thus, the terminal selects a suitable land network cell or a non-terrestrial network cell from the air-space-ground integrated network to reside in.

Description

[Technical Field]

[0001] (Cross-reference of related applications) This application is based on and claims priority from CN Application No. 202210444502.8, filed April 26, 2022, the disclosure of which is incorporated herein in its entirety. The present disclosure relates to the field of wireless communication technology, and in particular to a cell reselection method for an integrated air-space-ground network, a communication system, a terminal, and related devices such as a communication device. [Background technology]

[0002] Air-space-ground integration, as a future trend of network evolution, will have a profound impact on existing network architectures and communication processes. Unlike traditional cellular networks, air-space-ground integrated networks include two parts: terrestrial networks (TN) and non-terrestrial networks (NTN). Terrestrial networks include, for example, cellular networks, and non-terrestrial networks include, for example, satellite networks.

[0003] In some related art, mobility management in the idle state of a terminal is mainly performed by cell selection / reselection, and a target cell is selected according to radio measured signal strength.

[0004] Research has shown that in an air-space-ground integrated network, the difference in user radio signal strength between the center of the NTN cell and the edge of the NTN cell is not obvious, so the method of cell reselection based on radio measurement signal strength cannot be applied to the cell reselection needs of an air-space-ground integrated network. Summary of the Invention

[0005] Some embodiments of the present disclosure provide a method for implementing cell re-election in an integrated air-space-ground network. Provide a way to choose A terminal listens to a broadcast message and receives a Obtain coverage information for the current resident cell and neighboring cells, and a network cell or a land network cell; If the current resident cell is a non-terrestrial network cell, the terminal is Based on the information, the location relationship information between the terminal and the current resident cell is determined, and the location relationship information between the terminal and the current resident cell is determined. Triggering cell reselection measurements based on location relationship information with a resident cell of the mobile station; The terminal performs cell reselection based on a cell reselection measurement result. fruit, The cell reselection measurement result includes measurement information of radio signals of neighboring cells and movement information of the terminal, and the movement information of the terminal includes at least one of a movement direction and a movement speed. .

[0006] In some embodiments, if the current residence cell is a land network cell, the terminal triggers cell reselection measurements based on the radio signal strength of the current residence cell.

[0008] In some embodiments, the terminal performing cell reselection based on a cell reselection measurement result comprises: The terminal determines a first candidate cell set based on measurement information of radio signals of neighboring cells; The terminal selects a target cell in which to reside from the first candidate cell set based on movement information of the terminal and coverage information of neighboring cells.

[0009] In some embodiments, the terminal determining a first candidate cell set based on measurement information of radio signals of neighboring cells includes the terminal determining, based on the measurement information of radio signals of neighboring cells, neighboring cells that satisfy an R criterion as the first candidate cell set.

[0010] In some embodiments, the terminal selecting a target cell to reside in from the first candidate cell set based on mobility information of the terminal and coverage information of neighboring cells includes: When the current resident cell is a non-terrestrial network cell and both of the neighboring cells are non-terrestrial network cells, the terminal selects, based on the terminal's mobility information and neighboring cell coverage information, a candidate cell with the longest planned residence time from the first candidate cell set as a planned residence target cell; or When the current resident cell is a non-terrestrial network cell and the neighboring cells are all terrestrial network cells, the terminal determines the candidate cell with the highest priority in the first candidate cell set according to the R criterion as the target cell to be resident; or When the current resident cell is a non-terrestrial network cell and the neighboring cells include a non-terrestrial network cell and a terrestrial network cell, the terminal selects, based on the moving direction of the terminal and coverage information of the neighboring cells, candidate cells in the same direction as the moving direction of the terminal from the first candidate cell set as a second candidate cell set, and selects a target cell to be resident on from the second candidate cell set based on the moving speed of the terminal.

[0011] In some embodiments, the terminal selecting a target cell to reside in from the first candidate cell set based on mobility information of the terminal and coverage information of neighboring cells includes: When the current resident cell is a land network cell and all of the neighboring cells are non-land network cells, the terminal selects, based on the terminal's mobility information and neighboring cell coverage information, a candidate cell with the longest planned residence time from the first candidate cell set as a target cell for planned residence; or When the current resident cell is a land network cell and both neighboring cells are land network cells, the terminal determines the candidate cell with the highest priority in the first candidate cell set according to the R criterion as the target cell to be resident; or When the current resident cell is a land network cell and the neighboring cells include a non-land network cell and a land network cell, the terminal selects, based on the moving direction of the terminal and coverage information of the neighboring cells, candidate cells in the same direction as the moving direction of the terminal from the first candidate cell set as a second candidate cell set, and selects a target cell to be resident from the second candidate cell set based on the moving speed of the terminal.

[0012] In some embodiments, selecting a target cell to reside on from the second candidate cell set based on the movement speed of the terminal includes determining whether the movement speed of the terminal is higher than a speed threshold, and if the movement speed is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to reside on, and if the movement speed is equal to or lower than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell to reside on.

[0013] In some embodiments, the cover information is used to describe the boundaries of a cell.

[0014] In some embodiments, the coverage information is further used to implicitly indicate a type of cell, or the broadcast message further includes indication information for indicating a type of cell, the type of cell including a non-terrestrial network cell and a terrestrial network cell.

[0015] In some embodiments, the coverage information includes a cell center location and a cell radius.

[0016] In some embodiments, the terminal triggering cell reselection measurement based on location relationship information between the terminal and a current resident cell includes triggering cell reselection measurement if a distance between the terminal and a current resident cell is greater than a distance threshold.

[0017] In some embodiments, the terminal triggering cell reselection measurements based on the radio signal strength of a current resident cell includes triggering cell reselection measurements when the radio signal strength of the current resident cell is lower than a strength threshold.

[0018] In some embodiments, the terminal selecting a target cell to reside on from the first candidate cell set based on the movement information of the terminal and coverage information of neighboring cells includes the terminal selecting, based on the movement direction of the terminal and coverage information of neighboring cells, a candidate cell in the same direction as the movement direction of the terminal from the first candidate cell set as a second candidate cell set, and selecting a candidate cell from the second candidate cell set that is different in type from the currently resident cell as the target cell to reside on, wherein the type of the currently resident cell is a non-terrestrial network cell or a terrestrial network cell.

[0019] Some embodiments of the present disclosure provide a cell reselection method for an integrated air-space-ground network, comprising: The method includes transmitting a broadcast message so that the terminal performs cell reselection based on the broadcast message, the broadcast message including coverage information of a current cell and a neighboring cell, and the current cell and the neighboring cell are non-terrestrial network cells or terrestrial network cells.

[0020] In some embodiments, the cover information is used to describe the boundaries of a cell.

[0021] In some embodiments, the coverage information is further used to implicitly indicate a type of cell, or the broadcast message further includes indication information for indicating a type of cell, where the type of cell includes a non-terrestrial network cell and a terrestrial network cell.

[0022] Some embodiments of the present disclosure provide a terminal including a memory and a processor coupled to the memory, wherein the processor executes a cell reselection method for an integrated air-space-ground network based on instructions stored in the memory.

[0023] Some embodiments of the present disclosure provide a communications device including a memory and a processor coupled to the memory, wherein the processor performs a cell reselection method for an integrated air-space-ground network based on instructions stored in the memory.

[0024] Some embodiments of the present disclosure provide a communication system, including a terminal and a communication device.

[0025] Some embodiments of the present disclosure provide a non-instantaneous computer-readable storage medium having stored thereon a computer program that, when executed by a processor, performs steps to realize a cell reselection method for an integrated air-space-ground network. [Brief explanation of the drawings]

[0026] The drawings that are required to be used in the description of the embodiments or related art are briefly described below. The present disclosure can be more clearly understood from the following detailed description taken in conjunction with the accompanying drawings.

[0027] Apparently, the drawings in the following description are only some embodiments of the present disclosure, and those skilled in the art can also obtain other drawings based on these drawings without paying creative labor. [Figure 1] 1 is a flowchart of a cell reselection method for an integrated air-space-ground network in some embodiments of the present disclosure. [Figure 2] FIG. 2 is a schematic diagram of cell reselection between non-terrestrial network cells in some embodiments of the present disclosure. [Figure 3] FIG. 1 is a schematic diagram of cell reselection at the boundary between an NTN and a TN in some embodiments of the present disclosure. [Figure 4] FIG. 1 is a schematic diagram of a communication system in accordance with some embodiments of the present disclosure. [Figure 5] FIG. 1 is a schematic diagram of a terminal according to some embodiments of the present disclosure. [Figure 6] FIG. 1 is a schematic diagram of a communication device according to some embodiments of the present disclosure. DETAILED DESCRIPTION OF THE INVENTION

[0028] The following clearly and completely describes the technical approaches in the embodiments of the present disclosure with the aid of drawings in the embodiments of the present disclosure.

[0029] Unless otherwise specified, the terms "first", "second", etc. in this disclosure are used to distinguish between different objects and are not used to denote size, timing, etc.

[0030] In the embodiments of the present disclosure, by adding coverage information of related cells to the broadcast message, the terminal can not only choose to trigger cell reselection measurement based on the radio signal strength of the currently resident cell, but also choose to trigger cell reselection measurement based on location relationship information between the terminal and the currently resident cell, so that the terminal can select and reside in an appropriate land network cell or non-land network cell in the air-space-ground integrated network, thereby improving the accuracy and success rate of cell reselection and reducing the energy consumption and signaling overhead of the terminal.

[0031] FIG. 1 is a flowchart of a cell reselection method for an integrated air-space-ground network in some embodiments of the present disclosure.

[0032] As shown in FIG. 1, the cell reselection method for the integrated air-space-ground network in this embodiment includes steps 110 to 150.

[0033] In step 110, a communication device of a cell sends a broadcast message, the broadcast message including coverage information of a current cell and neighboring cells. In an air-space-ground integrated network, the current cell and neighboring cells may be non-terrestrial network cells or terrestrial network cells.

[0034] The coverage information can be used to describe the boundary of a cell, and can also implicitly indicate the type of the cell, where the type of the cell includes a non-terrestrial network cell and a terrestrial network cell, because the coverage area of ​​the non-terrestrial network cell is much larger than that of the terrestrial network cell, and it can be determined that the type of the cell is a non-terrestrial network cell or a terrestrial network cell based on the coverage area of ​​the cell.

[0035] Optionally, the broadcast message further includes indication information for indicating the type of cell, so as to indicate the type of cell in an explicit manner.

[0036] In some embodiments, the cover information includes information such as cell center locations and cell radii, but the cover information is not limited to this expression.

[0037] The communication device of the land network cell that transmits the broadcast message may be, for example, a base station, etc. The communication device of the non-land network cell that transmits the broadcast message may be, for example, a satellite, etc., but is not limited to the examples given.

[0038] In step 120, the terminal listens to a broadcast message, and obtains coverage information of a current resident cell and neighboring cells from the broadcast message, where the current resident cell and neighboring cells are non-terrestrial network cells or terrestrial network cells.

[0039] The terminal can periodically listen to the broadcast message, and based on the information contained in the broadcast message, the terminal can obtain over-information of the current resident cell and neighboring cells from the broadcast message, and can also obtain indication information of the type of each cell.

[0040] In step 130, if the current resident cell is a non-terrestrial network cell, the terminal determines location relationship information between the terminal and the current resident cell based on the coverage information of the current resident cell (step 130a), and triggers cell reselection measurement based on the location relationship information between the terminal and the current resident cell (step 130b).

[0041] The triggering of cell reselection measurement by the terminal based on location relationship information between the terminal and a current resident cell includes determining that the terminal is located at an edge of a non-terrestrial network cell in which the terminal currently resides and triggering cell reselection measurement when a distance between the terminal and the current resident cell is greater than a distance threshold, where the distance threshold may be set according to coverage information of the non-terrestrial network cell.

[0042] In step 140, if the current residence cell is a land network cell, the terminal triggers a cell reselection measurement based on the radio signal strength of the current residence cell.

[0043] Triggering cell reselection measurement by the terminal based on the radio signal strength of the current resident cell includes determining that the terminal is located at the edge of the land network cell in which the terminal currently resides and triggering cell reselection measurement when the radio signal strength of the current resident cell is lower than a strength threshold, where the strength threshold may be set according to the signal strength of the land network cell.

[0044] In step 150, the terminal performs cell reselection based on the cell reselection measurement result.

[0045] The cell reselection measurement result obtained by the terminal performing the cell reselection measurement includes measurement information of the radio signals of neighboring cells and movement information of the terminal, etc. Here, the measurement information of the radio signals is, for example, radio signal strength, and the movement information of the terminal includes, for example, movement direction, movement speed, movement acceleration, etc.

[0046] In some embodiments, the terminal performing cell reselection based on the cell reselection measurement result includes the terminal determining a first candidate cell set based on measurement information of radio signals of neighboring cells, and the terminal selecting a target cell to reside in from the first candidate cell set based on mobility information of the terminal and coverage information of the neighboring cells.

[0047] In some embodiments, the terminal determining a first candidate cell set based on measurement information of radio signals of neighboring cells includes the terminal determining, based on the measurement information of radio signals of neighboring cells, neighboring cells that satisfy an R criterion as the first candidate cell set.

[0048] The R criteria are as follows: Rs=Qmeas_s+Qhysts Rn=Qmeas_n-Qoffsets_n where: Qmeas_s is the serving cell received signal quality measurement, i.e., the RSRP (Reference Signal Receiving Power) of the P-CCPCH (Primary Common Control Physical Channel), Qmeas_n is the neighbor cell received signal quality measurement, Qhysts is the cell reselection delay, Qoffsets_n is the difference between the received signal quality requirements of two cells (serving cell and neighbor cell).

[0049] Priority is arranged according to the magnitude of the R parameters (Rs (R value of the serving cell), Rn (R value of the neighboring cell)), and the larger the R value, the higher the priority. If a neighboring cell has a higher priority than the current serving cell within the cell reselection time, the current serving cell will be reselected to the neighboring cell that meets the conditions.

[0050] In some embodiments, the terminal selecting a target cell to reside in from the first candidate cell set based on mobility information of the terminal and coverage information of neighboring cells includes: If the current resident cell is a non-terrestrial network cell and both of the neighboring cells are non-terrestrial network cells, the terminal selects, from the first candidate cell set, a candidate cell with the longest planned residence time as a planned residence target cell based on movement information (e.g., movement direction, movement speed, etc.) of the terminal and coverage information of the neighboring cells; or If the current resident cell is a non-terrestrial network cell and all of the neighboring cells are terrestrial network cells, the terminal selects a candidate cell with the highest priority in the first candidate cell set as a target cell to reside in according to an R criterion; or When the current resident cell is a non-terrestrial network cell and the neighboring cells include a non-terrestrial network cell and a terrestrial network cell, the terminal selects, from the first candidate cell set, candidate cells in the same direction as the movement direction of the terminal as a second candidate cell set based on the movement direction of the terminal and coverage information of the neighboring cells, and selects, from the second candidate cell set, a target cell on which the terminal will reside based on the movement speed of the terminal.

[0051] Here, selecting a target cell to be stationed on from the second candidate cell set based on the moving speed of the terminal includes determining whether the moving speed of the terminal is higher than a speed threshold, and if the moving speed is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to be stationed on, thereby avoiding frequent cell reselection, and if the moving speed is equal to or lower than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell to be stationed on, thereby preferentially serving the terminal from the terrestrial network cell and saving power of the terminal.

[0052] In another embodiment, the terminal selecting a target cell to reside in from the first candidate cell set based on mobility information of the terminal and coverage information of neighboring cells includes: If the current resident cell is a land network cell and all of the neighboring cells are non-land network cells, the terminal selects, from the first candidate cell set, a candidate cell with the longest planned residence time as a target cell for planned residence based on movement information (e.g., movement direction, movement speed, etc.) of the terminal and coverage information of the neighboring cells; or If the current resident cell is a land network cell and both neighboring cells are land network cells, the terminal selects a candidate cell with the highest priority in the first candidate cell set as a target cell to reside in according to an R criterion; or When the current resident cell is a land network cell and the neighboring cells include a non-land network cell and a land network cell, the terminal selects, based on the moving direction of the terminal and coverage information of the neighboring cells, candidate cells in the same direction as the moving direction of the terminal from the first candidate cell set as a second candidate cell set, and selects, based on the moving speed of the terminal, a target cell on which the terminal will reside from the second candidate cell set.

[0053] Here, selecting a target cell to be stationed on from the second candidate cell set based on the moving speed of the terminal includes determining whether the moving speed of the terminal is higher than a speed threshold, and if the moving speed is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to be stationed on, thereby avoiding frequent cell reselection, and if the moving speed is equal to or lower than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell to be stationed on, thereby preferentially providing service to the terminal from the terrestrial network cell and saving power of the terminal.

[0054] In another embodiment, the terminal selecting a target cell to reside on from the first candidate cell set based on movement information of the terminal and coverage information of neighboring cells includes the terminal selecting, based on a movement direction of the terminal and coverage information of neighboring cells, a candidate cell in the same direction as a movement direction of the terminal from the first candidate cell set as a second candidate cell set, and selecting, from the second candidate cell set, a candidate cell whose type is different from that of the current resident cell as a target cell to reside on. For example, when the terminal moves from an urban area to a suburban area, it can reselect from a terrestrial network cell in the urban area to a non-terrestrial network cell in the suburban area, or when the terminal moves from a suburban area to an urban area, it can reselect from a non-terrestrial network cell in the suburban area to a terrestrial network cell in the urban area.

[0055] In this embodiment, by adding coverage information of related cells to the broadcast message, the terminal can not only choose to trigger cell reselection measurement based on the radio signal strength of the currently residing cell, but also choose to trigger cell reselection measurement based on location relationship information between the terminal and the currently residing cell, allowing the terminal to select an appropriate land network cell or non-land network cell from the air-space-ground integrated network to reside in, improving the accuracy and success rate of cell reselection and reducing the terminal's energy consumption and signaling overhead.In addition, the terminal selects a target cell to reside in based on the terminal's moving direction / speed and cell coverage information, further improving the accuracy of cell reselection and reducing the number of cell reselections.

[0056] Below are some examples of air-space-ground integrated network cell reselection.

[0057] If both the current resident cell and the neighboring cell are non-terrestrial network cells, cell reselection is performed between the non-terrestrial network cells. Figure 2 shows a schematic diagram of cell reselection between the non-terrestrial network cells.

[0058] Step 1: An NTN cell broadcasts the center location and cell radius information of the current cell and neighboring NTN cells within its service range.

[0059] Step 2: The terminal periodically listens to the broadcast message, calculates the relationship between the terminal position and the center position of the resident NTN cell, and triggers cell reselection measurement when the threshold is exceeded. The cell reselection measurement result includes information such as the measurement of the radio signals of neighboring cells and the terminal's moving direction and moving speed.

[0060] Step 3: Deciding on the reselected cell: The terminal selects a candidate cell set S1 that satisfies the R criterion based on the radio signal measurement results, and the terminal selects the candidate cell with the longest planned residence time from the set S1 as the target cell for residence based on the terminal's movement information (e.g., movement direction, movement speed, etc.) and the coverage information of neighboring cells.

[0061] Below are some application examples for cell reselection between non-terrestrial network cells.

[0062] NTN cells broadcast the latitude information (X, Y) of the cell center and the cell radius R within their service area. The above information can be added to the original SIB (SystemInfoRmationBlock) message or a new SIB message can be defined.

[0063] The terminal periodically listens to the broadcast message, calculates the distance D0 between the terminal position and the center position of the NTN cell of the current service, calculates the distance Di between the terminal position and the center position of the i-th neighboring NTN cell (D1 and D2 shown in Figure 2), and triggers cell reselection neighboring cell measurement when the distance D0 exceeds a threshold. The thresholds are: TH0, the distance threshold between the terminal and the current serving NTN cell; and THi, the distance threshold between the terminal and the i-th neighboring NTN cell, where TH0 = a0 × R0, THi = ai × Ri, a0 and ai are scaling coefficients, R0 is the radius of the current serving NTN cell, and Ri is the radius of the i-th neighboring NTN cell. For example, in Figure 2, taking two neighboring NTN cells as an example, TH1 = a1 × R1, TH2 = a2 × R2. The conditions for triggering cell reselection measurement are one of the following: (1) if the distance D0 between the terminal and the serving NTN cell is greater than the threshold TH0, cell reselection measurement is triggered; (2) if the distance Di between the terminal and the neighboring NTN cell is less than the threshold THi, cell reselection measurement is triggered; or (3) if D0 is greater than the distance threshold TH0 from the serving NTN cell and Di is less than the distance threshold THi from the neighboring NTN cell, cell reselection measurement is triggered. Here, the cell reselection measurement result includes information such as the measurement of radio signals of neighboring cells and the moving direction / speed of the terminal.

[0064] If the candidate cells that satisfy the R criterion through the wireless channel measurement results of the terminal are all NTN cells: {NTN cell 1, NTN cell 2, NTN cell 3, NTN cell 4, NTN cell 5, NTN cell 6}, then the terminal selects the final reselection cell based on the predetermined maximum dwell time.

[0065] At the NTN-TN boundary, the NTN cell and the TN cell are adjacent to each other. Figure 3 shows a schematic diagram of cell reselection at the NTN-TN boundary.

[0066] Step 1: The NTN cell broadcasts the center location information of the current cell and neighboring TN cells within its service range, and the radius information of the current cell, and the TN cell broadcasts the center location and cell radius information of neighboring NTN cells within its service range.

[0067] Step 2: The terminal periodically listens to broadcast messages, and (1) if it is currently residing in an NTN cell, calculates the relationship between the terminal position and the center position of the resident NTN cell, and if it exceeds a threshold, triggers cell reselection measurement, where the cell reselection measurement result includes information such as the measurement of the radio signal of the neighboring cell and the terminal's moving direction / speed, and (2) if it is currently residing in a TN cell, triggers cell reselection measurement if the radio signal strength is below the threshold, where the cell reselection measurement result includes information such as the measurement of the radio signal of the neighboring cell and the terminal's moving direction / speed.

[0068] Step 3: Deciding on the reselected cell: The terminal selects a candidate cell set S1 that satisfies the R criterion based on the measurement results of the radio signals, and selects a candidate cell set S2 from set S1 that is in the same direction as the terminal's moving direction based on the terminal's moving direction and coverage information of neighboring cells, and then selects a target cell to reside on from set S2 based on the terminal's moving speed. For example, if the terminal's moving speed is higher than a speed threshold, a non-terrestrial network cell is selected from the second candidate cell set as the target cell to reside on, thereby avoiding frequent cell reselection, and if the terminal's moving speed is not higher than the speed threshold, a terrestrial network cell is selected from the second candidate cell set as the target cell to reside on, thereby preferentially serving the terminal from the terrestrial network cell and saving power for the terminal.

[0069] Below is an example application for cell reselection at the boundary between NTN and TN.

[0070] The NTN cell broadcasts the latitude and longitude information (X1, Y1) of the current cell center, the cell radius R0, and the latitude and longitude information (X2, Y2) of the TN neighbor cell centers within its service area. The above information can be added to the original SIB message or a new SIB message can be defined.

[0071] If the terminal currently resides in an NTN cell and periodically listens to broadcast messages, it calculates the distance D0 between the terminal position and the center position of the serving cell, and if it exceeds a threshold, it triggers cell reselection neighbor cell measurement. The cell reselection measurement result includes information such as measurements of the radio signals of neighbor cells and the terminal's moving direction / speed.

[0072] If the candidate cell set S1 for which the terminal's radio channel measurement results satisfy the R criterion is {NTN cell 1, NTN cell 2, NTN cell 3, NTN cell 4, TN cell 5, TN cell 6}, the candidate cell set S2 is narrowed to {NTN cell 2, TN cell 5} according to the movement direction, and selection is made based on the terminal's movement speed. If the terminal's movement speed is relatively fast, for example, when on a high-speed train, NTN cell 2 is selected from set S2 as the target cell to reside on, thereby avoiding frequent cell reselection. If the terminal's movement speed is not fast, TN cell 5 is selected from set S2 as the target cell to reside on, thereby preferentially providing service to the terminal from land network cells and saving terminal power consumption.

[0073] 4 is a schematic diagram of a communication system according to some embodiments of the present disclosure. As shown in FIG. 4, a communication system 400 according to this embodiment includes a terminal 410 and a communication device 420.

[0074] The communication device 420 transmits a broadcast message, where the broadcast message includes coverage information of the current cell and neighboring cells.

[0075] The terminal 410 listens to a broadcast message and obtains coverage information of a current resident cell and neighboring cells from the broadcast message. The current resident cell and neighboring cells are non-terrestrial network cells or terrestrial network cells. If the current resident cell is a non-terrestrial network cell, the terminal 410 determines location relationship information between the terminal and the current resident cell based on the coverage information of the current resident cell and triggers cell reselection measurement based on the location relationship information between the terminal and the current resident cell. If the current resident cell is a terrestrial network cell, the terminal 410 triggers cell reselection measurement based on the radio signal strength of the current resident cell. The terminal 410 performs cell reselection based on the cell reselection measurement result.

[0076] 5 shows a schematic diagram of a terminal according to some embodiments of the present disclosure. The terminal is a user device such as a mobile phone, a tablet, etc.

[0077] As shown in FIG. 5, the terminal 410 of this embodiment includes a memory 510 and a processor 520 connected to the memory 510, and the processor 520 executes the cell reselection method for the integrated air-space-ground network in any of the above-described embodiments based on instructions stored in the memory 510.

[0078] 6 is a schematic diagram of a communication device according to some embodiments of the present disclosure. The communication device of a land network cell that transmits the broadcast message may be, for example, a base station. The communication device of a non-land network cell that transmits the broadcast message may be, for example, a satellite. However, the examples given here are not limiting.

[0079] As shown in FIG. 6, the communication device 420 of this embodiment includes a memory 610 and a processor 620 coupled to the memory 610, and the processor 620 performs the cell reselection method for the integrated air-space-ground network in any of the above-described embodiments based on instructions stored in the memory 610.

[0080] Here, the memories 510 and 610 may include, for example, a system memory, a fixed non-volatile storage medium, etc. The system memory stores, for example, an operating system, applications, a boot loader, and other programs.

[0081] Here, the processors 520, 620 may be implemented in the form of discrete hardware components such as a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gates or transistors.

[0082] The terminal 410 and the communication device 420 may also include an input / output interface, a network interface, a storage interface, etc. These interfaces, the memory, and the processor may be connected via, for example, a bus. Here, the input / output interface provides a connection interface for input / output devices such as a display, a mouse, a keyboard, and a touch screen. The network interface provides a connection interface for various network devices. The storage interface provides a connection interface for external storage devices such as an SD card and a U disk. The bus may use any bus structure among multiple bus structures. For example, bus structures include, but are not limited to, an Industry Standard Architecture (ISA) bus, a MicroChannel Architecture (MCA) bus, and a Peripheral Component Interconnect (PCI) bus.

[0083] Those skilled in the art will appreciate that embodiments of the present disclosure may be provided as a method, a system, or a computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. The present disclosure may also take the form of a computer program product embodied on a non-transitory computer-readable storage medium containing one or more computer program codes, including, but not limited to, a magnetic disk memory, a CD-ROM, an optical memory, etc.

[0084] The present disclosure will be described with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present disclosure. It should be understood that each flow and / or block in the flowcharts and / or block diagrams, and combinations of flows and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine that, when executed by the processor of the computer or other programmable data processing device, generates means for implementing the functions specified in one or more flows in the flowcharts and / or one or more blocks in the block diagrams.

[0085] These computer program instructions may also be stored in a computer-readable memory that causes a computer or other programmable data processing apparatus to operate in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including an instruction device that implements the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0086] These computer program instructions may also be loaded into a computer or other programmable data processing apparatus and can execute a series of operational steps on the computer or other programmable device to generate a computer-implemented process, such that the instructions executing on the computer or other programmable device provide steps for implementing the functions specified in one or more flows of the flowcharts and / or one or more blocks of the block diagrams.

[0087] The above are only preferred embodiments of the present disclosure, and do not need to limit the present disclosure, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure should be included in the protection scope of the present disclosure.

Claims

1. A cell reselection method for an integrated air-space-ground network, comprising: A terminal listens to a broadcast message, obtains coverage information of a current resident cell and a neighboring cell from the broadcast message, and determines that the current resident cell and the neighboring cell are non-terrestrial network cells or terrestrial network cells; When the current resident cell is a non-terrestrial network cell, the terminal determines location relationship information between the terminal and the current resident cell based on coverage information of the current resident cell, and triggers cell reselection measurement based on the location relationship information between the terminal and the current resident cell; The terminal performs cell reselection based on a cell reselection measurement result; The cell reselection measurement result includes measurement information of radio signals of neighboring cells and movement information of the terminal, and the movement information of the terminal includes at least one of a movement direction and a movement speed. A cell reselection method for an integrated air-space-ground network, comprising:

2. 2. The cell reselection method for an air-space-ground integrated network according to claim 1, further comprising: if the current resident cell is a land network cell, the terminal triggers cell reselection measurement based on the radio signal strength of the current resident cell.

3. The terminal performing cell reselection based on the cell reselection measurement result, The terminal determines a first candidate cell set based on measurement information of radio signals of neighboring cells; The cell reselection method for an air-space-ground integrated network according to claim 1, characterized in that the method further comprises the terminal selecting a target cell in which to reside from the first candidate cell set based on movement information of the terminal and coverage information of neighboring cells.

4. The terminal determining a first candidate cell set based on measurement information of radio signals of neighboring cells includes: The cell reselection method for an air-space-ground integrated network according to claim 3, further comprising the terminal determining, based on measurement information of radio signals of neighboring cells, neighboring cells that satisfy an R criterion as a first candidate cell set.

5. The terminal selecting a target cell to reside in from the first candidate cell set based on mobility information of the terminal and coverage information of neighboring cells, When the current resident cell is a non-terrestrial network cell and both neighboring cells are non-terrestrial network cells, the terminal selects a candidate cell with the longest planned residence time from the first candidate cell set as a planned residence target cell based on the terminal's mobility information and neighboring cell coverage information; or If the current resident cell is a non-terrestrial network cell and both neighboring cells are terrestrial network cells, the terminal determines the candidate cell with the highest priority in the first candidate cell set according to the R criterion as the target cell to be resident; or 4. The cell reselection method for an air-space-ground integrated network according to claim 3, further comprising: when the current resident cell is a non-terrestrial network cell and the neighboring cells include a non-terrestrial network cell and a terrestrial network cell, the terminal selects candidate cells in the same direction as the movement direction of the terminal from the first candidate cell set as a second candidate cell set based on the movement direction of the terminal and coverage information of the neighboring cells, and selects a target cell to be resident from the second candidate cell set based on the movement speed of the terminal.

6. The terminal selecting a target cell to reside in from the first candidate cell set based on movement information of the terminal and coverage information of neighboring cells, When the current resident cell is a land network cell and all of the neighboring cells are non-land network cells, the terminal selects a candidate cell with the longest planned residence time from the first candidate cell set as a target cell for planned residence based on the terminal's mobility information and neighboring cell coverage information; or If the current resident cell is a land network cell and both neighboring cells are land network cells, the terminal determines the candidate cell with the highest priority in the first candidate cell set according to the R criterion as the target cell to be resident; or 4. The cell reselection method for an air-space-ground integrated network according to claim 3, further comprising: when the current resident cell is a land network cell and the neighboring cells include a non-land network cell and a land network cell, the terminal selects candidate cells in the same direction as the movement direction of the terminal from the first candidate cell set as a second candidate cell set based on the movement direction of the terminal and coverage information of the neighboring cells; and selecting a target cell to be resident from the second candidate cell set based on the movement speed of the terminal.

7. Selecting a target cell to reside in from the second candidate cell set based on the moving speed of the terminal includes: The cell reselection method for an air-space-ground integrated network according to claim 5, further comprising: determining whether the moving speed of the terminal is higher than a speed threshold; and if the moving speed is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as a target cell to reside on; or if the moving speed is equal to or lower than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as a target cell to reside on.

8. The cell reselection method for an integrated air-space-ground network according to claim 1, wherein the coverage information is used to describe the boundary of a cell.

9. The cover information is further used to implicitly indicate the type of cell, or The broadcast message further includes an indication information for indicating a type of cell; The cell reselection method for an integrated air-space-ground network according to claim 8, wherein the types of cells include non-terrestrial network cells and terrestrial network cells.

10. The cell reselection method for an air-space-ground integrated network according to claim 1, wherein the coverage information includes a cell center position and a cell radius.

11. Triggering cell reselection measurement by the terminal based on location relationship information between the terminal and a current resident cell, 2. The cell reselection method for an air-space-ground integrated network according to claim 1, further comprising: triggering a cell reselection measurement when a distance between the terminal and a current resident cell is greater than a distance threshold.

12. Triggering a cell reselection measurement based on a radio signal strength of a currently residing cell by the terminal, The cell reselection method for an air-space-ground integrated network according to claim 2, further comprising: triggering cell reselection measurements when the radio signal strength of the current resident cell is lower than a strength threshold.

13. The terminal selecting a target cell to reside in from the first candidate cell set based on movement information of the terminal and coverage information of neighboring cells, The cell reselection method for an air-space-ground integrated network according to claim 3, further comprising the step of: based on the terminal's moving direction and coverage information of neighboring cells, selecting candidate cells from the first candidate cell set that are in the same direction as the terminal's moving direction as a second candidate cell set; selecting a candidate cell from the second candidate cell set that is different in type from the currently resident cell as a target cell to be resident; and the type of the currently resident cell being a non-terrestrial network cell or a terrestrial network cell.

14. 1. A terminal including a memory and a processor coupled to the memory, A terminal characterized in that the processor executes the cell reselection method for an integrated air-space-ground network according to any one of claims 1 to 13 based on instructions stored in the memory.

15. A communication system comprising the terminal according to claim 14.

16. A non-instantaneous computer-readable storage medium storing a computer program that, when executed by a processor, performs steps for realizing a cell reselection method for an air-space-ground integrated network according to any one of claims 1 to 13.

17. A computer program comprising instructions which, when executed by a processor, cause the processor to perform the cell reselection method for an integrated air-space-ground network according to any one of claims 1 to 13.

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