Space-air-ground integrated network cell reselection method, communication system and related equipment

Abstract

This disclosure proposes a cell reselection method, communication system, and related equipment for an integrated air-space-ground network, relating to the field of wireless communication technology. The method includes: a terminal listening to broadcast messages and obtaining coverage information of the currently camped cell and neighboring cells from the broadcast messages, wherein the currently camped cell and neighboring cells are either non-terrestrial network cells or terrestrial network cells; if the currently camped cell is a non-terrestrial network cell, the terminal determines the positional relationship information between the terminal and the currently camped cell based on the coverage information of the currently camped cell, and triggers cell reselection measurement based on the positional relationship information between the terminal and the currently camped cell; if the currently camped cell is a terrestrial network cell, the terminal triggers cell reselection measurement based on the wireless signal strength of the currently camped cell; the terminal performs cell reselection based on the cell reselection measurement results. This enables the terminal to select a suitable terrestrial network cell or non-terrestrial network cell for camping within the integrated air-space-ground network.

Description

Technical Field

[0001] This 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 and terminal, and related equipment. Background Technology

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

[0003] In some related technologies, mobility management in the idle state of a terminal is mainly accomplished through cell selection / reselection, which selects the target cell by wirelessly measuring signal strength.

[0004] Research has found that in an integrated air-space-ground network, the difference in wireless signal strength between a user at the center of an NTN cell and at the edge of an NTN cell is not significant. Therefore, the method of cell reselection based on wireless signal strength measurement cannot meet the cell reselection requirements of an integrated air-space-ground network. Summary of the Invention

[0005] This embodiment of the present disclosure adds coverage information of relevant cells to the broadcast message, so that the terminal can not only choose to trigger cell reselection measurement based on the wireless signal strength of the currently camped cell, but also choose to trigger cell reselection measurement based on the location relationship information between the terminal and the currently camped cell. This allows the terminal to select a suitable terrestrial network cell or non-terrestrial network cell to camp on in the integrated air-space-ground network, which improves the accuracy and success rate of cell reselection, and reduces terminal power consumption and signaling overhead.

[0006] This disclosure proposes a cell reselection method for an integrated air-space-ground network, including:

[0007] The terminal listens to broadcast messages and obtains the coverage information of the currently camped cell and neighboring cells from the broadcast messages. The currently camped cell and neighboring cells are either non-terrestrial network cells or terrestrial network cells.

[0008] If the currently camped cell is a non-terrestrial network cell, the terminal determines the location relationship information between the terminal and the currently camped cell based on the coverage information of the currently camped cell, and triggers cell reselection measurement based on the location relationship information between the terminal and the currently camped cell;

[0009] If the currently camped cell is a terrestrial network cell, the terminal triggers a cell reselection measurement based on the wireless signal strength of the currently camped cell;

[0010] The terminal performs cell reselection based on the cell reselection measurement results.

[0011] In some embodiments, the cell reselection measurement results include measurement information of radio signals from neighboring cells and the terminal's movement information, wherein the terminal's movement information includes one or more of movement direction and movement speed.

[0012] In some embodiments, the cell reselection performed by the terminal based on the cell reselection measurement results includes:

[0013] The terminal determines the first candidate cell set based on the measurement information of the wireless signals of neighboring cells;

[0014] The terminal selects the target cell it wants to stay in from the first candidate cell set based on its own mobility information and the coverage information of neighboring cells.

[0015] In some embodiments, the terminal determines the first candidate cell set based on the measurement information of the radio signals of neighboring cells, which includes: the terminal determines neighboring cells that satisfy the R criterion as the first candidate cell set based on the measurement information of the radio signals of neighboring cells.

[0016] In some embodiments, the terminal selects a target cell to stay in from the first candidate cell set based on the terminal's mobility information and the coverage information of neighboring cells, including:

[0017] If the current cell is a non-terrestrial network cell and all neighboring cells are non-terrestrial network cells, the terminal selects the candidate cell with the longest expected dwell time from the first candidate cell set as the target cell to dwell on, based on the terminal's mobility information and the coverage information of the neighboring cells.

[0018] If the current cell is a non-terrestrial network cell and the neighboring cells are all terrestrial network cells, the terminal will select the candidate cell with the highest priority in the first candidate cell set as the target cell to be camped on according to the R criterion.

[0019] If the currently camped cell is a non-terrestrial network cell and the neighboring cells include both non-terrestrial network cells and terrestrial network cells, the terminal selects candidate cells from the first candidate cell set that are in the same direction as the terminal's movement direction as the second candidate cell set, based on the terminal's movement direction and the coverage information of the neighboring cells. Then, based on the terminal's movement speed, the terminal selects the target cell to camp on from the second candidate cell set.

[0020] In some embodiments, the terminal selects a target cell to stay in from the first candidate cell set based on the terminal's mobility information and the coverage information of neighboring cells, including:

[0021] If the current stationing cell is a terrestrial network cell and the neighboring cells are all non-terrestrial network cells, the terminal selects the candidate cell with the longest expected stationing time from the first candidate cell set as the target cell to station, based on the terminal's mobility information and the coverage information of the neighboring cells.

[0022] If the current cell is a terrestrial network cell and all neighboring cells are terrestrial network cells, the terminal will select the candidate cell with the highest priority in the first candidate cell set as the target cell to be camped on, according to the R criterion.

[0023] If the currently camped cell is a terrestrial network cell and the neighboring cells include non-terrestrial network cells and terrestrial network cells, the terminal selects candidate cells in the same direction as the terminal's movement direction from the first candidate cell set as the second candidate cell set based on the terminal's movement direction and the coverage information of the neighboring cells, and selects the target cell to camp on from the second candidate cell set based on the terminal's movement speed.

[0024] In some embodiments, selecting a target cell to camp on from the second candidate cell set based on the terminal's moving speed includes: determining whether the terminal's moving speed is higher than a speed threshold; if it is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to camp on; if it is not higher than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell to camp on.

[0025] In some embodiments, the coverage information is used to describe the boundaries of the cell.

[0026] In some embodiments, the coverage information is also used to implicitly indicate the type of cell; or, the broadcast message may further include indication information to indicate the type of cell; wherein the cell type includes non-terrestrial network cells and terrestrial network cells.

[0027] In some embodiments, the coverage information includes the cell center location and the cell radius.

[0028] In some embodiments, the terminal triggering cell reselection measurement based on the location relationship information between the terminal and the currently camped cell includes: triggering cell reselection measurement if the distance between the terminal and the currently camped cell is greater than a distance threshold; the terminal triggering cell reselection measurement based on the wireless signal strength of the currently camped cell includes: triggering cell reselection measurement if the wireless signal strength of the currently camped cell is lower than a strength threshold.

[0029] In some embodiments, the terminal selects a target cell to camp on from the first candidate cell set based on the terminal's movement information and the coverage information of neighboring cells. This includes: the terminal selecting candidate cells in the same direction as the terminal's movement direction from the first candidate cell set as a second candidate cell set based on the terminal's movement direction and the coverage information of neighboring cells; and selecting candidate cells of a different type from the currently camped cell from the second candidate cell set as the target cell to camp on. The currently camped cell is of the type of non-terrestrial network cell or terrestrial network cell.

[0030] This disclosure proposes a cell reselection method for an integrated air-space-ground network, including:

[0031] A broadcast message is sent, which includes coverage information of the current cell and neighboring cells, which are either non-terrestrial network cells or terrestrial network cells, so that the terminal can perform cell reselection based on the broadcast message.

[0032] In some embodiments, the coverage information is used to describe the boundaries of the cell.

[0033] In some embodiments, the coverage information is also used to implicitly indicate the type of cell; or, the broadcast message may further include indication information to indicate the type of cell; wherein the cell type includes non-terrestrial network cells and terrestrial network cells.

[0034] Some embodiments of this disclosure propose a terminal including: a memory; and a processor coupled to the memory, the processor being configured to execute an integrated air-space-ground network cell reselection method based on instructions stored in the memory.

[0035] Some embodiments of this disclosure provide a communication device, including: a memory; and a processor coupled to the memory, the processor being configured to execute an integrated air-space-ground network cell reselection method based on instructions stored in the memory.

[0036] This disclosure provides some embodiments of a communication system, including a terminal and a communication device.

[0037] Some embodiments of this disclosure propose a non-transitory computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps of a cell reselection method for an integrated air-space-ground network. Attached Figure Description

[0038] The accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. This disclosure can be more clearly understood from the following detailed description with reference to the accompanying drawings.

[0039] Obviously, the accompanying drawings described below are merely some embodiments of this disclosure. Those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0040] Figure 1 The diagram illustrates a flowchart of a cell reselection method for an integrated air-space-ground network according to some embodiments of this disclosure.

[0041] Figure 2 The illustration shows some embodiments of the present disclosure of cell reselection between various non-terrestrial network cells.

[0042] Figure 3 The diagram illustrates some embodiments of this disclosure of cell reselection at the NTN and TN boundary.

[0043] Figure 4 A schematic diagram of a communication system according to some embodiments of the present disclosure is shown.

[0044] Figure 5 A schematic diagram of a terminal according to some embodiments of this disclosure is shown.

[0045] Figure 6 A schematic diagram of a communication device according to some embodiments of the present disclosure is shown. Detailed Implementation

[0046] The technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0047] Unless otherwise stated, the terms "first," "second," etc., used in this disclosure are used to distinguish different objects and are not used to indicate size or sequence.

[0048] Figure 1 The diagram illustrates a flowchart of a cell reselection method for an integrated air-space-ground network according to some embodiments of this disclosure.

[0049] like Figure 1 As shown, the cell reselection method for an integrated air-space-ground network in this embodiment includes:

[0050] In step 110, the cell's communication equipment sends a broadcast message, which includes coverage information for the cell and neighboring cells. In an integrated air-space-ground network, the cell and neighboring cells can be either non-terrestrial network cells or terrestrial network cells.

[0051] The coverage information can be used to describe the cell boundaries and implicitly indicate the cell type, which includes non-terrestrial network cells and terrestrial network cells. This is because the coverage area of ​​a non-terrestrial network cell is much larger than that of a terrestrial network cell, and the cell type can be determined based on its coverage area.

[0052] If necessary, the broadcast message may also include indication information to indicate the type of cell, thereby indicating the type of cell in an explicit manner.

[0053] In some embodiments, the coverage information may include information such as the cell center location and cell radius, but the coverage information is not limited to this expression.

[0054] The communication equipment for a terrestrial network cell that sends broadcast messages can be, for example, a base station. The communication equipment for a non-terrestrial network cell that sends broadcast messages can be, for example, a satellite. However, it is not limited to the examples given.

[0055] In step 120, the terminal listens to broadcast messages and obtains the coverage information of the currently camped cell and neighboring cells from the broadcast messages. The currently camped cell and neighboring cells are either non-terrestrial network cells or terrestrial network cells.

[0056] The terminal can periodically listen to broadcast messages. Based on the information carried in the broadcast messages, the terminal can obtain coverage information of the currently active cell and neighboring cells, as well as indication information of the type of each cell.

[0057] In step 130, if the currently camped cell is a non-terrestrial network cell, the terminal determines the location relationship information between the terminal and the currently camped cell based on the coverage information of the currently camped cell (step 130a), and triggers cell reselection measurement based on the location relationship information between the terminal and the currently camped cell (step 130b).

[0058] The terminal triggering cell reselection measurement based on the location relationship information between the terminal and the currently camped cell includes: if the distance between the terminal and the currently camped cell is greater than a distance threshold, it indicates that the terminal is located at the edge of the currently camped non-terrestrial network cell, and cell reselection measurement is triggered.

[0059] In step 140, if the currently camped cell is a terrestrial network cell, the terminal triggers a cell reselection measurement based on the wireless signal strength of the currently camped cell.

[0060] The terminal triggers cell reselection measurement based on the wireless signal strength of the currently camped cell, including: if the wireless signal strength of the currently camped cell is lower than the strength threshold, it indicates that the terminal is located at the edge of the currently camped terrestrial network cell, and cell reselection measurement is triggered.

[0061] In step 150, the terminal performs cell reselection based on the cell reselection measurement results.

[0062] The cell reselection measurement results obtained by the terminal include measurement information of the radio signals of neighboring cells and the terminal's movement information. The radio signal measurement information includes, for example, radio signal strength. The terminal's movement information includes, for example, movement direction, movement speed, and movement acceleration.

[0063] The cell reselection process performed by the terminal based on the cell reselection measurement results includes: the terminal determining a first candidate cell set based on the measurement information of the radio signals of neighboring cells; and the terminal selecting a target cell to camp on from the first candidate cell set based on the terminal's mobility information and the coverage information of neighboring cells.

[0064] The terminal determines the first candidate cell set based on the measurement information of the wireless signals of neighboring cells by: the terminal determines neighboring cells that satisfy the R criterion as the first candidate cell set based on the measurement information of the wireless signals of neighboring cells.

[0065] R-criterion:

[0066] Rs = Qmeas_s + Qhysts,

[0067] Rn = Qmeas_n – Qoffsets_n,

[0068] in:

[0069] Qmeas_s is the serving cell's received signal quality measurement value, namely the RSRP (Reference Signal Receiving Power) of the P-CCPCH (Primary Common Control Physical Channel).

[0070] Qmeas_n represents the measured signal quality of neighboring cells;

[0071] Qhysts represents cell reselection hysteresis;

[0072] Qoffsets_n is the difference in received signal quality requirements between two cells (the serving cell and the neighboring cell).

[0073] Priority is determined by the values ​​of the R parameters (Rs, Rn), with larger R values ​​indicating higher priority. If a neighboring cell has a higher priority than the current serving cell within the cell reselection period, the current serving cell will reselect to a neighboring cell that meets the criteria.

[0074] In some embodiments, the terminal selects a target cell to stay in from the first candidate cell set based on the terminal's mobility information and the coverage information of neighboring cells, including:

[0075] If the current camping cell is a non-terrestrial network cell and all neighboring cells are non-terrestrial network cells, the terminal selects the candidate cell with the longest expected camping time from the first candidate cell set as the target cell to camp on, based on the terminal's movement information (such as movement direction, movement speed, etc.) and the coverage information of the neighboring cells.

[0076] If the current cell is a non-terrestrial network cell and the neighboring cells are all terrestrial network cells, the terminal will select the candidate cell with the highest priority in the first candidate cell set as the target cell to be camped on according to the R criterion.

[0077] If the currently camped cell is a non-terrestrial network cell and the neighboring cells include both non-terrestrial network cells and terrestrial network cells, the terminal selects candidate cells from the first candidate cell set that are in the same direction as the terminal's movement direction as the second candidate cell set, based on the terminal's movement direction and the coverage information of the neighboring cells. Then, based on the terminal's movement speed, the terminal selects the target cell to camp on from the second candidate cell set.

[0078] The process of selecting a target cell from the second candidate cell set based on the terminal's moving speed includes: determining whether the terminal's moving speed is higher than a speed threshold; if it is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to avoid frequent cell reselection; if it is not higher than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell to prioritize terrestrial network cell service for the terminal, thereby saving terminal power.

[0079] In other embodiments, the terminal selects the target cell to which it wishes to stay from the first candidate cell set based on the terminal's mobility information and the coverage information of neighboring cells, including:

[0080] If the current stationing cell is a terrestrial network cell and the neighboring cells are all non-terrestrial network cells, the terminal selects the candidate cell with the longest expected stationing time from the first candidate cell set as the target cell to station, based on the terminal's movement information (such as movement direction, movement speed, etc.) and the coverage information of the neighboring cells.

[0081] If the current cell is a terrestrial network cell and all neighboring cells are terrestrial network cells, the terminal will select the candidate cell with the highest priority in the first candidate cell set as the target cell to be camped on, according to the R criterion.

[0082] If the currently camped cell is a terrestrial network cell and the neighboring cells include non-terrestrial network cells and terrestrial network cells, the terminal selects candidate cells in the same direction as the terminal's movement direction from the first candidate cell set as the second candidate cell set based on the terminal's movement direction and the coverage information of the neighboring cells, and selects the target cell to camp on from the second candidate cell set based on the terminal's movement speed.

[0083] The process of selecting a target cell from the second candidate cell set based on the terminal's moving speed includes: determining whether the terminal's moving speed is higher than a speed threshold; if it is higher than the speed threshold, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to avoid frequent cell reselection; if it is not higher than the speed threshold, selecting a terrestrial network cell from the second candidate cell set as the target cell to prioritize terrestrial network cell service for the terminal, thereby saving terminal power.

[0084] In other embodiments, the terminal selects a target cell to camp on from the first candidate cell set based on its movement information and the coverage information of neighboring cells. This includes: the terminal selecting candidate cells in the same direction as its movement direction from the first candidate cell set as a second candidate cell set, and selecting candidate cells of a different type from the currently camped cell from the second candidate cell set as the target cell to camp on. For example, when the terminal moves from an urban area to a suburban area, it can be reselected from a terrestrial network cell in the urban area to a non-terrestrial network cell in the suburbs; or, when the terminal moves from a suburban area to an urban area, it can be reselected from a non-terrestrial network cell in the suburbs to a terrestrial network cell in the urban area.

[0085] This embodiment adds coverage information of relevant cells to the broadcast message, allowing the terminal to trigger cell reselection measurements not only based on the wireless signal strength of the currently camped cell, but also based on the locational relationship between the terminal and the currently camped cell. This enables the terminal to select suitable terrestrial network cells or non-terrestrial network cells to camp on within the integrated air-space-ground network, improving the accuracy and success rate of cell reselection while reducing terminal power consumption and signaling overhead. Furthermore, the terminal selects the target cell to camp on based on its movement direction / speed and the cell coverage information, further improving the accuracy of cell reselection and reducing the number of cell reselection attempts.

[0086] Below are some examples of cell reselection in an integrated air-space-ground network.

[0087] If the current cell and the neighboring cells are all non-terrestrial network cells, then cell reselection will be performed among the various non-terrestrial network cells. Figure 2 This diagram illustrates cell reselection among various non-terrestrial network cells.

[0088] Step 1: The NTN cell broadcasts the center location and radius information of its own cell and neighboring NTN cells within its service area;

[0089] Step 2: The terminal periodically listens to broadcast messages, calculates the relationship between the terminal's location and the center location of the NTN cell it is camped on, and triggers cell reselection measurement if the threshold is exceeded. The cell reselection measurement results include the measurement of the wireless signal of neighboring cells and information such as the terminal's movement direction and speed.

[0090] Step 3: Determine the cell to be reselected:

[0091] The terminal selects a set of candidate cells S1 that meet the R criterion based on the measurement results of the wireless signal; the terminal selects the candidate cell with the longest expected dwell time from the set S1 as the target cell to be dwelled on based on the terminal's movement information (such as movement direction, movement speed, etc.) and the coverage information of neighboring cells.

[0092] The following are examples of applications for cell reselection between various non-terrestrial network cells.

[0093] NTN cells broadcast the cell center's latitude and longitude (X, Y) and cell radius R within their service area. This information can be added to existing SIB (System Information Block) messages or defined as new SIB messages.

[0094] The terminal periodically listens for broadcast messages, calculates the distance D0 between the terminal's location and the center location of the currently serving NTN cell, and calculates the distance Di between the terminal's location and the center location of the i-th adjacent NTN cell (e.g., ...). Figure 2 As shown in the diagram (D1 and D2), exceeding the threshold triggers a cell reselection neighbor measurement. This threshold includes a distance threshold of TH0 between the terminal and the current serving NTN cell, and a distance threshold of THi between the terminal and the i-th neighboring NTN cell, where TH0 = a0 × R0, THi = ai × Ri, a0 and ai are scaling factors, R0 is the radius of the current serving NTN cell, and Ri is the radius of the i-th neighboring NTN cell. For example, using... Figure 2Taking two adjacent NTN cells as an example, TH1 = a1 × R1, TH2 = a2 × R2, any of the following can be used as the condition to trigger cell reselection measurement: (1) When the distance D0 between the terminal and the serving NTN cell is greater than the threshold value TH0, cell reselection measurement is triggered; (2) When the distance Di between the terminal and the adjacent NTN cell is less than the threshold value THi, cell reselection measurement is triggered; (3) When D0 is greater than the distance threshold value TH0 with the serving NTN cell and Di is less than the distance threshold value THi with the adjacent NTN cell, cell reselection measurement is triggered. Among them, the cell reselection measurement result includes the measurement of the wireless signal of the neighboring cell and information such as the terminal's moving direction / speed.

[0095] If the terminal obtains from the wireless channel measurement results that all candidate cells satisfying the R criterion are NTN cells: {NTN cell 1, NTN cell 2, NTN cell 3, NTN cell 4, NTN cell 5, NTN cell 6}, then the final reselection cell is selected based on the expected maximum dwell time.

[0096] If at the boundary between NTN and TN, NTN cells and TN cells are neighboring cells. Figure 3 A schematic diagram of cell reselection at the NTN and TN boundary is shown.

[0097] Step 1: NTN cells broadcast the center location information of their own cell and neighboring TN cells, as well as the radius information of their own cell, within their service area; TN cells broadcast the center location and radius information of neighboring NTN cells within their service area.

[0098] Step 2: The terminal periodically listens to broadcast messages. (1) If it is currently camped in an NTN cell, it calculates the relationship between the terminal's location and the center location of the NTN cell. If the value exceeds the threshold, it triggers cell reselection measurement. The cell reselection measurement results include the measurement of the wireless signal of the neighboring cell and information such as the terminal's movement direction / speed. (2) If it is currently camped in a TN cell, when the wireless signal strength is lower than the threshold, it triggers cell reselection measurement. The cell reselection measurement results include the measurement of the wireless signal of the neighboring cell and information such as the terminal's movement direction / speed.

[0099] Step 3: Determine the cell to be reselected:

[0100] The terminal selects a set of candidate cells S1 that satisfy the R criterion based on the measurement results of the wireless signal. Then, based on the terminal's movement direction and the coverage information of neighboring cells, the terminal selects a set of candidate cells S2 from set S1 that move in the same direction as the terminal. Finally, based on the terminal's movement speed, the terminal selects the target cell it wishes to camp on from set S2. For example, if the terminal's movement 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 avoid frequent cell reselection. If the terminal's movement speed is not higher than the speed threshold, a terrestrial network cell is selected from the second candidate cell set as the target cell, thus prioritizing service from terrestrial network cells and saving terminal power.

[0101] The following are application examples of cell reselection at the NTN and TN boundaries.

[0102] NTN cells broadcast their center latitude and longitude information (X1, Y1), cell radius R0, and center latitude and longitude information (X2, Y2) of TN neighboring cells within their service area. This information can be added to existing SIB messages or new SIB messages can be defined.

[0103] If the terminal is currently camped in an NTN cell and periodically listens for broadcast messages, it calculates the distance D0 between the terminal's location and the serving cell center. If the distance exceeds a threshold, it triggers a cell reselection measurement of neighboring cells. The cell reselection measurement results include measurements of neighboring cell radio signals and information such as the terminal's movement direction / speed.

[0104] If the terminal obtains a candidate cell set S1 that satisfies the R criterion through wireless channel measurement results, which is {NTN cell 1, NTN cell 2, NTN cell 3, NTN cell 4, TN cell 5, TN cell 6}, and then narrows the candidate cell set S2 to {NTN cell 2, TN cell 5} based on the direction of movement, then the selection is made based on the terminal's movement speed. If the terminal's movement speed is relatively fast, such as in a high-speed train, NTN cell 2 is selected from set S2 as the target cell to camp on, 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 camp on, thus prioritizing the terrestrial network cell to serve the terminal and saving terminal power.

[0105] Figure 4 A schematic diagram of a communication system according to some embodiments of this disclosure is shown. For example... Figure 4 As shown, the communication system 400 of this embodiment includes a terminal 410 and a communication device 420.

[0106] The communication device 420 sends a broadcast message, which includes coverage information for the current cell and neighboring cells.

[0107] Terminal 410 listens to broadcast messages and obtains coverage information of the currently camped cell and neighboring cells from the broadcast messages. The currently camped cell and neighboring cells are either non-terrestrial network cells or terrestrial network cells. If the currently camped cell is a non-terrestrial network cell, terminal 410 determines the location relationship information between the terminal and the currently camped cell based on the coverage information of the currently camped cell, and triggers cell reselection measurement based on the location relationship information between the terminal and the currently camped cell. If the currently camped cell is a terrestrial network cell, terminal 410 triggers cell reselection measurement based on the wireless signal strength of the currently camped cell. Terminal 410 performs cell reselection based on the cell reselection measurement results.

[0108] Figure 5 The diagram illustrates a terminal according to some embodiments of this disclosure. The terminal may be a user device such as a mobile phone or tablet computer.

[0109] like Figure 5 As shown, the terminal 410 of this embodiment includes a memory 510 and a processor 520 coupled to the memory 510. The processor 520 is configured to execute the air-space-ground integrated network cell reselection method in any of the foregoing embodiments based on instructions stored in the memory 510.

[0110] Figure 6 Schematic diagrams of communication devices according to some embodiments of this disclosure are shown. The communication device for a terrestrial network cell transmitting broadcast messages may be, for example, a base station. The communication device for a non-terrestrial network cell transmitting broadcast messages may be, for example, a satellite. However, the examples given are not exhaustive.

[0111] like Figure 6 As shown, the communication device 420 of this embodiment includes a memory 610 and a processor 620 coupled to the memory 610. The processor 620 is configured to execute the air-space-ground integrated network cell reselection method of any of the foregoing embodiments based on instructions stored in the memory 610.

[0112] The memory 510, 610 may include, for example, system memory, fixed non-volatile storage media, etc. The system memory may store, for example, the operating system, application programs, boot loader, and other programs.

[0113] The processors 520 and 620 can be implemented using general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete hardware components such as discrete gates or transistors.

[0114] Terminal 410 and communication device 420 may further include input / output interfaces, network interfaces, and storage interfaces. These interfaces, as well as the memory and processor, can be connected via, for example, a bus. The input / output interfaces provide connection interfaces for input / output devices such as displays, mice, keyboards, and touchscreens. The network interfaces provide connection interfaces for various networked devices. The storage interfaces provide connection interfaces for external storage devices such as SD cards and USB flash drives. The bus can use any of a variety of bus architectures. For example, bus architectures include, but are not limited to, Industry Standard Architecture (ISA) buses, Micro Channel Architecture (MCA) buses, and Peripheral Component Interconnect (PCI) buses.

[0115] Those skilled in the art will understand that embodiments of this disclosure can be provided as methods, systems, or computer program products. Therefore, this disclosure can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this disclosure can take the form of a computer program product embodied on one or more non-transitory computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer program code.

[0116] This disclosure is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations 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, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create a machine for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1A device that provides the functions specified in one or more boxes.

[0117] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0118] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0119] The above description is only a preferred embodiment of this disclosure and is not intended to limit this disclosure. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the protection scope of this disclosure.

Claims

1. A method for space-air-ground integrated network cell reselection, characterized in that, Comprising: The terminal listens to a broadcast message, obtains coverage information of a currently camped cell and neighboring cells from the broadcast message, and the coverage information is used to describe a boundary of a cell; If the currently camped cell is a non-terrestrial network cell, the terminal determines a distance between the terminal and the currently camped non-terrestrial network cell according to the coverage information of the currently camped non-terrestrial network cell, and if the distance between the terminal and the currently camped non-terrestrial network cell is greater than a distance threshold, it indicates that the terminal is located at an edge of the currently camped non-terrestrial network cell, triggering a cell reselection measurement, and the terminal performs cell reselection according to a cell reselection measurement result, and the cell reselection measurement includes a wireless signal of a neighboring cell and movement information of the terminal.

2. The method of claim 1, wherein, The cell reselection measurement result includes measurement information of the wireless signal of the neighboring cell and the movement information of the terminal, and the movement information of the terminal includes one or more of a moving direction and a moving speed.

3. The method of claim 2, wherein, The terminal performing cell reselection according to the cell reselection measurement result includes: The terminal determines a first candidate cell set according to the measurement information of the wireless signal of the neighboring cell; The terminal selects a target cell to camp on from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell.

4. The method of claim 3, wherein, The terminal determining a first candidate cell set according to the measurement information of the wireless signal of the neighboring cell includes: The terminal determines a first candidate cell set according to the measurement information of the wireless signal of the neighboring cell.

5. The method of claim 3, wherein, The terminal selecting a target cell to camp on from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell includes: If the currently camped cell is a non-terrestrial network cell and all the neighboring cells are non-terrestrial network cells, the terminal selects a candidate cell with the longest expected camping time from the first candidate cell set as the target cell to camp on according to the movement information of the terminal and the coverage information of the neighboring cells; If the currently camped cell is a non-terrestrial network cell and all the neighboring cells are terrestrial network cells, the terminal selects a candidate cell with the highest priority from the first candidate cell set as the target cell to camp on according to the R criterion; If the currently camped cell is a non-terrestrial network cell and the neighboring cells include non-terrestrial network cells and terrestrial network cells, the terminal selects a candidate cell in the same direction as the moving direction of the terminal from the first candidate cell set as a second candidate cell set according to the moving direction of the terminal and the coverage information of the neighboring cells, and selects the target cell to camp on from the second candidate cell set according to the moving speed of the terminal.

6. The method of claim 3, wherein, Further comprising: If the currently camped cell is a terrestrial network cell, the terminal triggers a cell reselection measurement according to a wireless signal strength of the currently camped terrestrial network cell.

7. The method of claim 6, wherein, The terminal selecting a target cell to camp on from the first candidate cell set according to the movement information of the terminal and the coverage information of the neighboring cell includes: If the current residing cell is a terrestrial network cell, and all the neighboring cells are non-terrestrial network cells, the terminal selects a candidate cell with the longest expected residing time from the first candidate cell set as the target cell to be camped on according to the moving information of the terminal and the coverage information of the neighboring cells. If the current residing cell is a terrestrial network cell, and all the neighboring cells are terrestrial network cells, the terminal selects a candidate cell with the highest priority from the first candidate cell set as the target cell to be camped on according to the R criterion. If the current residing cell is a terrestrial network cell, and the neighboring cells include non-terrestrial network cells and terrestrial network cells, the terminal selects a candidate cell in the same direction as the moving direction of the terminal from the first candidate cell set as a second candidate cell set according to the moving direction of the terminal and the coverage information of the neighboring cells, and selects the target cell to be camped on from the second candidate cell set according to the moving speed of the terminal.

8. The method according to claim 5 or 7, characterized in that, The selecting the target cell to be camped on from the second candidate cell set according to the moving speed of the terminal comprises: determining whether the moving speed of the terminal is higher than a speed threshold, and if yes, selecting a non-terrestrial network cell from the second candidate cell set as the target cell to be camped on, and if not, selecting a terrestrial network cell from the second candidate cell set as the target cell to be camped on.

9. The method of claim 1, wherein: the coverage information is further used to implicitly indicate the type of the cell; or the broadcast message further comprises indication information used to indicate the type of the cell; wherein the type of the cell comprises a non-terrestrial network cell or a terrestrial network cell.

10. The method of claim 1, wherein, the coverage information comprises a cell center position and a cell radius.

11. The method of claim 1, wherein: the terminal triggers the cell reselection measurement according to the wireless signal strength of the currently camped terrestrial network cell comprises: if the wireless signal strength of the currently camped terrestrial network cell is lower than a strength threshold, triggering the cell reselection measurement.

12. The method of claim 3, wherein, The terminal selects the target cell to be camped on from the first candidate cell set according to the moving information of the terminal and the coverage information of the neighboring cells comprises: the terminal selects a candidate cell in the same direction as the moving direction of the terminal from the first candidate cell set as a second candidate cell set according to the moving direction of the terminal and the coverage information of the neighboring cells, and selects a candidate cell different from the type of the current residing cell from the second candidate cell set as the target cell to be camped on, wherein the type of the current residing cell is a non-terrestrial network cell or a terrestrial network cell.

13. The method of any one of claims 1-7, 9-11, wherein, further comprising: a communication device sends a broadcast message, the broadcast message comprising coverage information of a current cell and neighboring cells, the current cell being a non-terrestrial network cell or a terrestrial network cell, and the neighboring cells being one or more of non-terrestrial network cells or terrestrial network cells, so that a terminal performs cell reselection according to the broadcast message.

14. A terminal, comprising: a memory; and a processor coupled to the memory, the processor configured to perform the space-air-ground integrated network cell reselection method of any one of claims 1-12 based on instructions stored in the memory.

15. A communication system comprising: a terminal configured to perform the space-air-ground integrated network cell reselection method of any one of claims 1-12; and a communication device configured to perform the space-air-ground integrated network cell reselection method of claim 13.

16. A non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the space-air-ground integrated network cell reselection method of any one of claims 1-13.

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