Cell reselection method and device, terminal equipment and network equipment

Abstract

The embodiment of the invention provides a cell reselection method and device, terminal equipment and network equipment, and the method comprises the steps that the terminal equipment can receive a cell reselection parameter sent by the network equipment; the cell reselection parameters comprise at least one of the following parameters used for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list used for multi-orbit satellite cell reselection, and a first threshold value used for triggering cell reselection of a high-orbit satellite cell; the second threshold value is used for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and the third threshold value is used for triggering cell reselection of the low-orbit satellite cell; and according to the cell reselection parameters, performing cell reselection among the multi-orbit satellite cells. According to the cell reselection method and device, the terminal equipment and the network equipment provided by the embodiment of the invention, the terminal equipment can be prevented from frequently executing a cell reselection process, and the power consumption of the terminal equipment and the network signaling load can be reduced.

Description

Technical Field

[0001] Embodiments of the present application relate to the field of communication technologies, and in particular, to a cell reselection method, apparatus, terminal device, and network device. Background Art

[0002] If the serving cell where the terminal device is currently camped is no longer suitable for camping, a cell reselection operation needs to be performed. The cell reselection operation refers to the terminal device reselecting a suitable cell to camp on a cell with a higher priority or better channel quality.

[0003] Currently, the cell reselection mechanism is as follows: The network device sets the priorities of different frequency points to control the terminal device to select a cell with a channel quality meeting the requirements on a certain frequency point for camping, so that the terminal device can provide better services for users.

[0004] However, for a non-terrestrial network (NTN) communication system that supports multi-orbit satellite access (for example, 5G NTN), in the case of lack of terrestrial network coverage, due to the high-speed mobility of multi-orbit satellites, the above cell reselection mechanism will cause the terminal device to frequently perform the cell reselection process, resulting in an increase in the power consumption of the terminal device and the network signaling load. Summary of the Invention

[0005] Embodiments of the present application provide a cell reselection method, apparatus, terminal device, and network device to solve the problem that the high-speed mobility of multi-orbit satellites causes the terminal device to frequently perform the cell reselection process, resulting in an increase in the power consumption of the terminal device and the network signaling load.

[0006] In a first aspect, embodiments of the present application provide a cell reselection method applied to a terminal device, and the method includes:

[0007] Receiving cell reselection parameters sent by a network device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection for a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection for a low-orbit satellite cell;

[0008] Performing cell reselection between multi-orbit satellite cells according to the cell reselection parameters.

[0009] In a possible implementation manner, the cell reselection parameters are included in a system message; or,

[0010] The cell reselection parameters are included in a signaling.

[0011] In a possible implementation manner, the cell reselection parameters include priority parameters; according to the cell reselection parameters, performing cell reselection between multi-orbit satellite cells includes:

[0012] Performing cell reselection between the multi-orbit satellite cells according to the priority parameters;

[0013] Wherein, the priority parameters are used to indicate the reselection priorities of the multi-orbit satellite cells, and the multi-orbit satellite cells include at least one of the following: geostationary orbit satellite cells, low-earth orbit satellite cells.

[0014] In a possible implementation manner, the cell reselection parameters include type indication parameters; according to the cell reselection parameters, performing cell reselection between multi-orbit satellite cells includes:

[0015] Performing cell reselection between the multi-orbit satellite cells according to the type indication parameters;

[0016] Wherein, the type indication parameters are used to indicate the satellite type corresponding to the serving cell of the terminal device, and the satellite type includes at least one of the following: geostationary orbit satellite, low-earth orbit satellite.

[0017] In a possible implementation manner, the serving cell of the terminal device is a low-earth orbit satellite cell, and the cell reselection parameters include priority parameters;

[0018] According to the cell reselection parameters, performing cell reselection between multi-orbit satellite cells includes:

[0019] When the priority parameter indicates that the reselection priority of the geostationary orbit satellite cell is higher than that of the low-earth orbit satellite cell, measuring the geostationary orbit satellite cell corresponding to the low-earth orbit satellite cell where the terminal device is located to obtain a measurement result of the geostationary orbit satellite cell;

[0020] Performing cell reselection according to the measurement result of the geostationary orbit satellite cell.

[0021] In a possible implementation manner, performing cell reselection according to the measurement result of the geostationary orbit satellite cell includes:

[0022] When the measurement result of the geostationary orbit satellite cell is greater than the first threshold, reselecting to the geostationary orbit satellite cell;

[0023] Wherein, the measurement result includes at least one of the following: signal quality, signal level.

[0024] In a possible implementation manner, the serving cell of the terminal device is a geostationary orbit satellite cell; the method further includes:

[0025] Measure the low-earth orbit satellite cell corresponding to the geostationary satellite cell where the terminal device is located to obtain the measurement result of the low-earth orbit satellite cell;

[0026] Perform cell reselection according to the measurement result of the low-earth orbit satellite cell.

[0027] In a possible implementation manner, the serving cell where the terminal device is located is a geostationary satellite cell; the method further includes:

[0028] When the service of the terminal device is a preset service, measure the low-earth orbit satellite cell corresponding to the geostationary satellite cell where the terminal device is located to obtain the measurement result of the low-earth orbit satellite cell;

[0029] Perform cell reselection according to the measurement result of the low-earth orbit satellite cell.

[0030] In a possible implementation manner, the preset service includes at least one of the following:

[0031] A low-latency service, where the data transmission latency of the low-latency service is less than or equal to a preset duration;

[0032] A high-rate service, where the data transmission rate of the high-rate service is greater than or equal to a preset rate.

[0033] In a possible implementation manner, performing cell reselection according to the measurement result of the low-earth orbit satellite cell includes:

[0034] When the measurement result of the low-earth orbit satellite cell is greater than the third threshold, reselect to the low-earth orbit satellite cell;

[0035] Wherein, the measurement result includes at least one of the following: signal quality, signal level.

[0036] In a possible implementation manner, performing cell reselection according to the measurement result of the low-earth orbit satellite cell includes:

[0037] Obtain the location of the terminal device and the ephemeris data of the low-earth orbit satellite corresponding to the low-earth orbit satellite cell;

[0038] Determine the distance between the terminal device and the low-earth orbit satellite according to the location of the terminal device and the ephemeris data;

[0039] Determine the remaining coverage duration of the terminal device in the low-earth orbit satellite cell according to the distance between the terminal device and the low-earth orbit satellite;

[0040] When the remaining coverage duration is greater than the duration threshold, perform cell reselection according to the measurement result of the low-earth orbit satellite cell and the remaining coverage duration.

[0041] In a possible implementation manner, performing cell reselection according to the measurement result of the low-earth orbit satellite cell includes:

[0042] Measure the geostationary satellite cell to obtain the measurement result of the geostationary satellite cell;

[0043] Perform cell reselection according to the measurement result of the low-earth orbit satellite cell and the measurement result of the geostationary satellite cell.

[0044] In a possible implementation manner, performing cell reselection according to the measurement result of the low-earth orbit satellite cell and the measurement result of the geostationary satellite cell includes:

[0045] When the measurement result of the geostationary satellite cell is less than the second threshold and the measurement result of the low-earth orbit satellite cell is greater than the third threshold, reselect to the low-earth orbit satellite cell;

[0046] Wherein, the measurement result includes at least one of the following: signal quality, signal level.

[0047] In a possible implementation manner, when there is no ground network coverage, the method further includes:

[0048] After the application layer of the terminal device receives a user-triggered operation request, the application layer sends a query request to the access layer of the terminal device, and the query request is used to query the cell status information corresponding to the terminal device;

[0049] The access layer sends the cell status information to the application layer;

[0050] The application layer determines whether to trigger cell reselection between multi-orbit satellite cells according to the cell status information and the service of the terminal device.

[0051] In a possible implementation manner, the method further includes:

[0052] The application layer sends a first instruction to the access layer, and the first instruction is used to indicate whether the access layer performs cell reselection between multi-orbit satellite cells;

[0053] When the first instruction indicates to perform cell reselection between multi-orbit satellite cells, the access layer sends the satellite cell reselection result to the application layer;

[0054] The application layer sends a second instruction to the access layer according to the satellite cell reselection result, where the second instruction is used to indicate whether the access layer performs satellite cell access operations;

[0055] When the second instruction indicates to perform satellite cell access operations, the access layer sends a satellite cell access result to the application layer;

[0056] After the application layer determines that the satellite cell access is successful according to the satellite cell access result, it executes the operation request triggered by the user.

[0057] In a possible implementation manner, when the application layer fails to execute the operation request triggered by the user, the method further includes at least one of the following:

[0058] The application layer re-triggers cell reselection between multi-orbit satellite cells;

[0059] The application layer generates a prompt message, where the prompt message is used to indicate that the operation request fails to be executed.

[0060] In a possible implementation manner, the network device is a satellite base station.

[0061] In a possible implementation manner, the terminal device includes at least one of the following:

[0062] An idle terminal device;

[0063] A non-active terminal device.

[0064] In a second aspect, an embodiment of the present application provides a cell reselection method, which is applied to a network device. The method includes:

[0065] Send cell reselection parameters to a terminal device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection for a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection for a low-orbit satellite cell. The cell reselection parameters are used for the terminal device to perform cell reselection between multi-orbit satellite cells.

[0066] In a possible implementation manner, the network device is a satellite base station.

[0067] In a possible implementation manner, the terminal device includes at least one of the following:

[0068] An idle terminal device;

[0069] An inactive terminal device.

[0070] In a third aspect, an embodiment of the present application provides a cell reselection device applied to a terminal device. The device includes:

[0071] A transceiver module, configured to receive cell reselection parameters sent by a network device. The cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection to a low-orbit satellite cell;

[0072] A processing module, configured to perform cell reselection between multi-orbit satellite cells according to the cell reselection parameters.

[0073] In a fourth aspect, an embodiment of the present application provides a cell reselection device applied to a network device. The device includes:

[0074] A transceiver module, configured to send cell reselection parameters to a terminal device. The cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection to a low-orbit satellite cell. The cell reselection parameters are used for the terminal device to perform cell reselection between multi-orbit satellite cells.

[0075] In a fifth aspect, an embodiment of the present application provides a terminal device, including:

[0076] At least one processor; and

[0077] A memory communicatively connected to the at least one processor; wherein,

[0078] The memory stores instructions executed by the at least one processor. The instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of the first aspect.

[0079] In a sixth aspect, an embodiment of the present application provides a network device, including:

[0080] At least one processor; and

[0081] A memory communicatively connected to the at least one processor; wherein,

[0082] The memory stores instructions to be executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method according to any one of the second aspect.

[0083] In a seventh aspect, an embodiment of the present application provides a non-transitory computer-readable storage medium storing computer instructions, wherein the computer instructions are used to cause a computer to execute the method according to any one of the first aspect or any one of the second aspect.

[0084] In an eighth aspect, an embodiment of the present application provides a program product, including a computer program, which implements the method according to any one of the first aspect or any one of the second aspect when executed by a processor.

[0085] The cell reselection method, apparatus, terminal device and network device provided by the embodiments of the present application enable the terminal device to receive cell reselection parameters sent by the network device, where the cell reselection parameters include parameters for multi-track satellite cell reselection. In the case of lack of terrestrial network coverage, the terminal device can perform cell reselection between multi-track satellite cells according to the cell reselection parameters, avoiding frequent cell reselection processes of the terminal device, which is beneficial to reducing the power consumption of the terminal device and reducing the network signaling load. BRIEF DESCRIPTION OF THE DRAWINGS

[0086] The drawings herein are incorporated into the specification and form a part of the specification, showing embodiments consistent with the present application and used together with the specification to explain the principles of the present application.

[0087] Figure 1 It is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application;

[0088] Figure 2 It is one of the exemplary diagrams showing a cell reselection method according to an embodiment of the present application;

[0089] Figure 3 It is a schematic diagram of a satellite neighbor cell corresponding to a serving cell provided by an embodiment of the present application;

[0090] Figure 4 It is another exemplary diagram showing a cell reselection method according to an embodiment of the present application;

[0091] Figure 5 It is a third exemplary diagram showing a cell reselection method according to an embodiment of the present application;

[0092] Figure 6 It is a fourth exemplary diagram showing a cell reselection method according to an embodiment of the present application;

[0093] Figure 7It is the fifth exemplary schematic diagram of a cell reselection method shown in the embodiments of this application;

[0094] Figure 8 It is the sixth exemplary schematic diagram of a cell reselection method shown in the embodiments of this application;

[0095] Figure 9 It is the seventh exemplary schematic diagram of a cell reselection method shown in the embodiments of this application;

[0096] Figure 10 It is one of the structural schematic diagrams of the cell reselection device provided by the embodiments of this application;

[0097] Figure 11 It is the second structural schematic diagram of the cell reselection device provided by the embodiments of this application;

[0098] Figure 12 It is the structural schematic diagram of the communication device provided by the embodiments of this application.

[0099] Through the above-mentioned drawings, the clear embodiments of this application have been shown, and there will be more detailed descriptions hereinafter. These drawings and textual descriptions are not intended to limit the scope of the concept of this application in any way, but to illustrate the concept of this application to those skilled in the art by referring to specific embodiments. Specific Embodiments

[0100] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitations, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including that element.

[0101] It should be noted that the user information (including but not limited to user equipment information, user personal information, etc.) and data (including but not limited to data for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data need to comply with relevant laws, regulations and standards, and corresponding operation entrances are provided for users to choose to authorize or reject. Here, the exemplary embodiments will be described in detail, and the examples are shown in the drawings.

[0102] In the embodiments of this application, "at least one" means one or more, and "a plurality" means two or more.

[0103] In the embodiments of the present application, the "connection" that appears refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and the embodiments of the present application do not make any limitations on this.

[0104] To facilitate the understanding of the cell reselection method provided by the embodiments of the present application, hereinafter, in combination with Figure 1 , the architecture of the communication system provided by the embodiments of the present application will be described.

[0105] Figure 1 It is a schematic diagram of the architecture of a communication system provided by an embodiment of the present application. Please refer to Figure 1 , the communication system 100 includes a terminal device 101 and a network device 102, and the terminal device 101 and the network device 102 can communicate with each other. It should be understood that Figure 1 The number and form of the devices shown are only for illustration and do not constitute a limitation on the embodiments of the present application. In practical applications, there may be two or more terminal devices and two or more network devices. Figure 1 The communication system shown only takes the example of including one terminal device 101 and one network device 102 for illustration.

[0106] It can be understood that the communication system described in the embodiments of the present application is to more clearly illustrate the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions proposed in the embodiments of the present application. Those of ordinary skill in the art know that with the evolution of the system architecture and the emergence of new service scenarios, the technical solutions proposed in the embodiments of the present application are equally applicable to similar technical problems.

[0107] The technical solutions provided by the embodiments of the present application can be applied to a variety of systems. The applicable systems may include but are not limited to: narrow band-internet of things (NB-IOT), longterm evolution (LTE), fifth-generation mobile communication system, or possible sixth-generation and seventh-generation mobile communication systems, vehicle-to-vehicle short-range communication system, satellite broadband communication system, and future mobile communication systems.

[0108] The technical solutions provided by the embodiments of the present application are also applicable to different network architectures, including but not limited to relay network architecture, dual-link architecture, vehicle-to-everything (V2X) architecture, device-to-device (D2D), Internet of Vessels, etc.

[0109] The network device involved in the embodiments of the present application may be an access network device, which may include a base station, a Centralized Unit (CU) node, a Distributed Unit (DU), a Wireless Access Controller, etc.

[0110] The base station (BS) in the embodiments of the present application, also referred to as base station equipment, is a device deployed in a radio access network (RAN) to provide wireless communication functions. For example, the equipment providing base station functions in a 4G network includes an evolved NodeB (eNB). In a wireless local area network (WLAN), the equipment providing base station functions is an access point (AP). In 5G New Radio (NR), the equipment providing base station functions is a gNB, and in a next-generation eNodeB (ng-eNB). Among them, communication between the gNB and the terminal device uses NR technology, and communication between the ng-eNB and the terminal device uses evolved universal terrestrial radio access (E-UTRA) technology. Both the gNB and the ng-eNB can be connected to the 5G core network. The base station in the embodiments of the present application also includes equipment providing base station functions in future new communication systems, etc.

[0111] The terminal device in this application is a device with wireless transceiver functions. The terminal device can be deployed on land, including indoor or outdoor, handheld, wearable or vehicle-mounted; it can also be deployed on water (e.g., ships, etc.); it can also be deployed in the air (e.g., airplanes, balloons, satellites, etc.). The terminal device can be a mobile phone, a tablet computer (Pad), a computer with wireless transceiver functions, a virtual reality (VR) terminal device, an augmented reality (AR) terminal device, a wireless terminal device in industrial control, a vehicle-mounted terminal device, a wireless terminal device in self-driving, a wireless terminal device in remote medical, a wireless terminal device in smart grid, a wireless terminal device in transportation safety, a wireless terminal device in smart city, a wireless terminal device in smart home, a wearable terminal device, a cellular phone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication functions, a computing device or other processing devices connected to a wireless modem, a terminal device in a 5G network or a terminal device in a future evolved public land mobile network (PLMN), etc., and the embodiments of this application do not limit this. The terminal device involved in the embodiments of this application can also be referred to as a user equipment (UE), an access terminal device, a vehicle-mounted terminal device, an industrial control terminal device, a user unit, a user station, a UE unit, a UE station, a mobile station, a mobile station (MS), a remote station, a remote terminal device, a remote user equipment, a mobile device, a wireless communication device, a UE agent or a UE device, etc. The terminal device can also be fixed or mobile.

[0112] NR cell reselection is a continuous process. After the terminal device performs cell selection, it still needs to continuously perform cell reselection to camp on a cell with a higher priority or better channel quality. For an NTN communication system that supports multi-orbit satellite access (e.g., 5G NTN), in the absence of terrestrial network coverage, due to the high mobility of multi-orbit satellites, the terminal device frequently executes the cell reselection process, resulting in an increase in the power consumption of the terminal device and the network signaling load, affecting network stability.

[0113] An embodiment of this application provides a cell reselection method. The terminal device can receive cell reselection parameters sent by the network device. The cell reselection parameters include parameters for multi-orbit satellite cell reselection, enabling the terminal device to perform cell reselection between multi-orbit satellite cells according to the cell reselection parameters in the absence of terrestrial network coverage, avoiding the terminal device from frequently executing the cell reselection process, which is beneficial to reducing the power consumption of the terminal device and the network signaling load, and improving network stability.

[0114] The following uses specific embodiments to elaborate in detail on the technical solution of this application and how the technical solution of this application solves the above technical problems. These several specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of this application will be described below in conjunction with the accompanying drawings.

[0115] The interaction process between the network device and the terminal device can be as Figure 2 shown in the embodiment, Figure 2 which is one of the exemplary diagrams of a cell reselection method shown in the embodiment of this application. Please refer to Figure 2 , and this cell reselection method can include the following steps:

[0116] S201. The network device sends cell reselection parameters to the terminal device.

[0117] The terminal device can receive the cell reselection parameters sent by the network device. The cell reselection parameters can include parameters for multi-orbit satellite cell reselection.

[0118] In some embodiments, the terminal device can be a non-connected terminal device, and the terminal device can include at least one of the following: a terminal device in the idle state; a terminal device in the inactive state.

[0119] If the terminal device is in the idle state, it means that there is no connection established between the terminal device and the network device. In this state, if the terminal device needs to transmit data to the network device, the terminal device needs to initiate a connection establishment process first.

[0120] If the terminal device is in the Inactive state, it means that the terminal device can retain some context information, enabling the terminal device to switch from the Inactive state to the Connected state faster than from the IDLE state to the Connected state. In this state, the terminal device can quickly resume data transmission without the need to establish a complete connection establishment process.

[0121] Optionally, the terminal device may support the high and low orbit reselection optimization function.

[0122] In some embodiments, the network device may be a satellite base station. That is, the terminal device can receive cell reselection parameters sent by the satellite base station, and the cell reselection parameters may include parameters for multi-orbit satellite cell reselection.

[0123] In some embodiments, the multi-orbit satellite cells may include at least one of the following: high-orbit satellite cells, low-orbit satellite cells.

[0124] Optionally, the multi-orbit satellite cells may further include medium-orbit satellite cells.

[0125] In some embodiments, the cell reselection parameters may be included in the system message; or, the cell reselection parameters may be included in the signaling. In other words, the system message may include the cell reselection parameters, or the signaling may include the cell reselection parameters.

[0126] Optionally, the system message may be a system broadcast message.

[0127] Exemplarily, the system message may be a Master Information Block (MIB) or a System Information Block (SIB).

[0128] Optionally, the signaling may include at least one of the following: Radio Resource Control (RRC) connection reconfiguration signaling, RRC connection release signaling. Among them, the RRC connection reconfiguration signaling is used to update the radio resource configuration between the terminal device and the network device, and the RRC connection release signaling is used to release the RRC connection of the terminal device, enabling the terminal device to enter the IDLE state from the Connected state.

[0129] In some embodiments, the cell reselection parameters may include at least one of the following parameters for multi-orbit satellite cell reselection: priority parameter, type indication parameter, candidate cell list, first threshold, second threshold, third threshold. Below, these parameters will be described one by one.

[0130] (1) Priority parameter

[0131] In some embodiments, a priority parameter may be used to indicate the reselection priority of a multi-orbit satellite cell, and the multi-orbit satellite cell may at least include at least one of the following: a high-orbit satellite cell, a low-orbit satellite cell.

[0132] In some embodiments, the "priority parameter" may also be interchangeable with terms such as "cell reselection orbit priority parameter" and "CellReselectionOrbitPriority".

[0133] Optionally, the satellite base station may send a system broadcast message or signaling to the terminal device, and the system broadcast message or signaling may include a priority parameter.

[0134] Optionally, the priority parameter may be an integer-type parameter. When the reselection priority indicated by the priority parameter is higher, its parameter value is larger.

[0135] The value range of the priority parameter may be {0, 1, 2, ……, M}, where M is a positive integer greater than 1. If the priority parameter of a satellite cell takes the value of M, it means that the reselection priority of the satellite cell is the highest. If the priority parameter of a satellite cell takes the value of 1, it means that the reselection priority of the satellite cell is the lowest.

[0136] In some embodiments, the priority parameter may also be used to indicate the reselection priority of a cell covered by the terrestrial network. For example, the terrestrial network may include a cellular mobile network.

[0137] When the terminal device has just powered on, or the terminal device has just been released from the connected state and restored to the idle state, and there is no clear service demand indication for the terminal device. If the terminal device is in an area lacking terrestrial network coverage, the terminal device needs to perform cell reselection between multi-orbit satellite cells. Facing different types of multi-orbit satellite cells, due to the wide coverage characteristics of Geostationary Earth Orbit (GEO) satellites, the reselection priority of the high-orbit satellite cell can be set to the highest reselection priority through the priority parameter.

[0138] For example, the data type of the priority parameter is integer (INTEGER), and the values may be {0, 1, 2, 3}. The relationship between the cell type of the multi-orbit satellite cell and the priority parameter may be as shown in Table 1.

[0139] Table 1

[0140]

[0141] The larger the parameter value of the priority parameter, the higher the reselection priority indicated by the priority parameter. According to Table 1, the reselection priority order of the above four cell types is as follows: the cell covered by the terrestrial network > the geostationary (GEO) satellite cell > the medium earth orbit (MEO) satellite cell > the low earth orbit (LEO) satellite cell.

[0142] In the case of lack of terrestrial network coverage, the terminal device can perform cell reselection among three multi-orbit satellite cells, namely, the geostationary (GEO) satellite cell, the medium earth orbit (MEO) satellite cell, and the low earth orbit (LEO) satellite cell. Among them, the maximum parameter value of the priority parameter of the geostationary satellite cell is 2, indicating that the geostationary satellite cell has the highest reselection priority, and the terminal device can preferentially reselect to the geostationary satellite cell.

[0143] In some embodiments, the multi-orbit satellite cells can be classified into geostationary satellites, medium earth orbit satellites, low earth orbit satellites, etc. according to the satellite type.

[0144] In some embodiments, the serving cell where the terminal device is located can correspond to one or more satellite neighbor cells.

[0145] Both the serving cell and the satellite neighbor cell can provide communication services for the terminal device. That is to say, the terminal device can be located within the coverage area of the serving cell and also within the coverage area of the satellite neighbor cell.

[0146] For ease of understanding, hereinafter, in combination with Figure 3 , the satellite neighbor cells corresponding to the serving cell in the embodiments of the present application and subsequent embodiments will be explained.

[0147] Figure 3 It is a schematic diagram of a satellite neighbor cell corresponding to a serving cell provided by an embodiment of the present application. Please refer to Figure 3 , the serving cell is a geostationary satellite cell, and the coverage area corresponding to the serving cell is Area 1; satellite neighbor cell 1 is a geostationary satellite cell, and the coverage area corresponding to satellite neighbor cell 1 is Area 2; satellite neighbor cell 2 is a low earth orbit satellite cell, and the coverage area corresponding to satellite neighbor cell 2 is Area 3. Among them, the common area among Area 1, Area 2, and Area 3 is Area 3, and the terminal device is located in Area 3, so that the serving cell 1, satellite neighbor cell 1, and satellite neighbor cell 2 can all provide satellite communication services for the terminal device.

[0148] In some embodiments, the "satellite neighbor cell" can also be replaced with terms such as "associated satellite cell" or "satellite neighboring cell".

[0149] The priority parameters of the first cell and the second cell can be the same, that is, the reselection priorities of the first cell and the second cell are the same. Among them, the first cell (or the second cell) can be the serving cell where the terminal device is located, and the second cell (or the first cell) can be the satellite neighbor cell corresponding to the serving cell where the terminal device is located. Or, both the first cell and the second cell can be the satellite neighbor cells corresponding to the serving cell where the terminal device is located.

[0150] If the satellite types of the first cell and the second cell are different, there can be the following three cases:

[0151] Case 1: The priority parameters of the first cell and the second cell can be the same, that is, the reselection priorities of the first cell and the second cell are the same.

[0152] Case 2: The parameter value of the priority parameter of the first cell is greater than the parameter value of the priority parameter of the second cell, that is, the reselection priority of the first cell is higher than the reselection priority of the second cell.

[0153] Case 3: The parameter value of the priority parameter of the first cell is less than the parameter value of the priority parameter of the second cell, that is, the reselection priority of the first cell is lower than the reselection priority of the second cell.

[0154] The priority parameter can further include sub-priority parameters corresponding to satellite cells of at least one satellite type, and the at least one satellite type can include at least one of the following: geostationary satellite, medium-earth orbit satellite, low-earth orbit satellite.

[0155] For any one satellite type, the sub-priority parameter corresponding to the satellite cell of this satellite type can be used to indicate: the reselection sub-priority of at least one satellite cell belonging to this satellite type.

[0156] It can be understood that for any one satellite type, there can be one or more satellite cells belonging to this satellite type, and different reselection sub-priorities can be configured for at least one satellite cell belonging to this satellite type, so as to facilitate the terminal device to perform cell reselection among the at least one satellite cell.

[0157] It should be noted that in some embodiments, terms such as "satellite type" and "orbit type" can be replaced with each other.

[0158] In some embodiments, the "sub-priority parameter" can also be replaced with terms such as "cell reselection orbit sub-priority parameter" and "CellReselectionOrbitSubPriority".

[0159] Optionally, the sub-priority parameter can be an integer-type parameter. When the reselection priority indicated by the sub-priority parameter is higher, its parameter value is larger.

[0160] The value range of the sub - priority parameter can be {0, 1, 2, ……, N}, where N is a positive integer greater than 1. If the sub - priority parameter of the satellite cell takes the value N, it means that the reselection sub - priority of the satellite cell is the highest. If the sub - priority parameter of the satellite cell takes the value 1, it means that the reselection sub - priority of the satellite cell is the lowest.

[0161] For example, the sub - priority parameter can be of integer type (INTEGER), and the values can be {0, 1, 2, 3, 4, 5, 6, 7}. The relationship between the satellite type, satellite cell and sub - priority parameter can be shown in Table 2.

[0162] Table 2

[0163]

[0164] If it is determined according to the priority parameter that the reselection priorities of the first cell and the second cell are the same, and there are sub - priority parameters corresponding to the first cell and the second cell, then the reselection priorities of the first cell and the second cell can be further determined according to the sub - priority parameters corresponding to the first cell and the second cell. The terminal device can reselect to the satellite cell with a higher value of the sub - priority parameter.

[0165] For example, both the first cell and the second cell are high - orbit satellite cells, and the values of their priority parameters are the same. However, the value of the sub - priority parameter of the first cell is 3, and the value of the sub - priority parameter of the second cell is 4, indicating that the reselection priority of the first cell is lower than that of the second cell.

[0166] The system message or signaling sent by the network device to the terminal device can carry the priority parameter. This priority parameter can help the terminal device quickly determine the reselection priorities of the serving cell and satellite neighboring cells, which is beneficial to improving the cell reselection efficiency.

[0167] (2)Type indication parameter

[0168] In some embodiments, the type indication parameter can be used to indicate the satellite type corresponding to the serving cell of the terminal device. The satellite type can at least include one of the following: high - orbit satellite, low - orbit satellite.

[0169] In some embodiments, the "type indication parameter" can also be interchanged with terms such as "satellite service type indication parameter", "Satellite Service Category Indication", etc.

[0170] Optionally, the satellite base station can send system broadcast messages or signaling to the terminal device, and the system broadcast messages or signaling can include the type indication parameter.

[0171] Optionally, the type indication parameter may include the NTN-NeighCellConfig extensible parameter.

[0172] Optionally, the NTN-NeighCellConfig extensible parameter may also be included in the NTN configuration (ntn-Config) message. The NTN configuration (ntn-Config) message can be used to provide the NTN configuration parameters required for the terminal device to access NR via NTN.

[0173] Exemplarily, the NTN configuration parameters may include ephemeris data, Timing Advance (TA) parameter, scheduling offset (k_offset), validity period of uplink (UL) synchronization information, and epoch time, etc.

[0174] The type indication parameter may be an integer-type parameter, and each satellite type may be configured with a corresponding type indication parameter.

[0175] The value range of the type indication parameter may be {0, 1, 2, ……, N}, where N is a positive integer greater than 1, and 0 to N respectively correspond to N satellite types.

[0176] For example, if the value of the type indication parameter is {0, 1, 2, 3}, the relationship between the satellite type and the type indication parameter may be as shown in Table 3.

[0177] Table 3

[0178]

[0179] The type indication parameter may be carried in the system message or signaling sent by the network device to the terminal device. This type indication parameter can help the terminal device quickly identify the satellite type of the serving cell where the terminal device is currently camped, so as to help the terminal device supporting the high and low orbit reselection optimization function to quickly perform cell reselection and improve the cell reselection efficiency.

[0180] (3) Candidate cell list

[0181] In some embodiments, the candidate cell list may be used for multi-orbit satellite cell reselection.

[0182] Optionally, the candidate cell list may include at least one low-earth orbit satellite cell.

[0183] Optionally, the candidate cell list may further include the cell data of each low-earth orbit satellite cell in at least one low-earth orbit satellite cell.

[0184] Exemplarily, the cell data may include, but is not limited to: the identifier of the LEO satellite cell, for example, the name and / or index of the LEO satellite cell; the ephemeris data of the LEO satellite corresponding to the LEO satellite cell.

[0185] In some embodiments, the "candidate cell list" may also be interchangeable with terms such as "LEO service neighboring cell list", "LEOServiceNeighCellList", etc.

[0186] Optionally, the candidate cell list can be used for the terminal device to perform LEO satellite cell reselection.

[0187] If the service of the terminal device requires the terminal device to camp on an LEO satellite cell, the terminal device can determine at least one LEO satellite cell through the candidate cell list and perform satellite cell reselection among the at least one LEO satellite cell.

[0188] In some embodiments, the service of the terminal device can be judged by multiple metrics such as bandwidth, data transmission rate, latency, frequency band, reliability, etc.

[0189] Exemplarily, the correspondence between the satellite cell, satellite type, metric type, metric value information, and supported services can be as shown in Table 4.

[0190] Table 4

[0191]

[0192] For example, high-bandwidth services or high-rate services may include, but are not limited to, at least one of the following services: streaming video services, large file transfer services, online game services. Low-bandwidth services or low-rate services may include, but are not limited to, at least one of the following services: short message services, low-rate voice services. Latency-sensitive services or low-latency services may include, but are not limited to, emergency communication services.

[0193] It should be noted that in Table 4, the values of the first bandwidth threshold, second bandwidth threshold, first preset rate, second preset rate, first frequency band, and second frequency band are for exemplary illustration of the solutions of the embodiments of the present application. In some other examples, the values of the first bandwidth threshold, second bandwidth threshold, first preset rate, second preset rate, first frequency band, and second frequency band can be any values, and the embodiments of the present application do not limit the values of the first bandwidth threshold, second bandwidth threshold, first preset rate, second preset rate, first frequency band, and second frequency band.

[0194] In some embodiments, the values of the first bandwidth threshold, second bandwidth threshold, first preset rate, second preset rate, first duration, first frequency band, and second frequency band can be determined by at least one of the following methods:

[0195] Method 1: The received indication information can be used to configure at least one of the following: a first bandwidth threshold, a second bandwidth threshold, a first preset rate, a second preset rate, a first frequency band, a first duration, and a second frequency band.

[0196] Optionally, the terminal device can receive the indication information sent by the network device. For example, the network device can be a satellite base station.

[0197] Method 2: The protocol agreed value can include at least one of the following: a first bandwidth threshold, a second bandwidth threshold, a first preset rate, a second preset rate, a first duration, a first frequency band, and a second frequency band.

[0198] (4) The first threshold

[0199] In some embodiments, the first threshold can be used to trigger cell reselection to a high-orbit satellite cell.

[0200] In some examples, the "first threshold" can be interchanged with terms such as "reselection threshold to high orbit".

[0201] The first threshold can include at least one of the following: a first quality threshold and a first level threshold. Among them, the first quality threshold is used to compare the signal quality of the terminal device to determine whether the terminal device needs to reselect from the current serving cell to a high-orbit satellite cell; the first level threshold is used to compare the signal strength of the terminal device to determine whether the terminal device needs to reselect from the current serving cell to a high-orbit satellite cell.

[0202] The current serving cell can be the cell where the terminal device currently resides.

[0203] In some embodiments, the first threshold can be used to determine whether the signal of the high-orbit satellite cell meets the reselection conditions when the reselection priority of the serving cell is lower than that of the high-orbit satellite cell.

[0204] (5) The second threshold

[0205] In some embodiments, the second threshold can be used to trigger cell reselection from a high-orbit satellite cell to a low-orbit satellite cell.

[0206] In some examples, the "second threshold" can be interchanged with terms such as "reselection threshold to low orbit".

[0207] The second threshold value may include at least one of the following: a second quality threshold value and a second level threshold value. Among them, the second quality threshold value is used to compare the signal quality of the terminal device to determine whether the terminal device needs to reselect from a high-orbit satellite cell to a low-orbit satellite cell; the first level threshold value is used to compare the signal strength of the terminal device to determine whether the terminal device needs to reselect from a high-orbit satellite cell to a low-orbit satellite cell.

[0208] In some embodiments, the second threshold value may be used to determine whether the signal of the high-orbit satellite cell meets the reselection condition when the serving cell is a high-orbit satellite cell and the reselection priority of the high-orbit satellite cell is lower than that of the low-orbit satellite cell.

[0209] (6)The third threshold value

[0210] In some embodiments, the third threshold value may be used to trigger the cell reselection to a low-orbit satellite cell.

[0211] In some examples, the "third threshold value" may be interchangeable with terms such as "threshold value for reselection to a low-orbit cell".

[0212] The third threshold value may include at least one of the following: a third quality threshold value and a third level threshold value. Among them, the third quality threshold value is used to compare the signal quality of the terminal device to determine whether the terminal device needs to reselect from the current serving cell to a low-orbit satellite cell; the third level threshold value is used to compare the signal strength of the terminal device to determine whether the terminal device needs to reselect from the current serving cell to a low-orbit satellite cell.

[0213] In some embodiments, the third threshold value may be used to determine whether the signal of the low-orbit satellite cell meets the reselection condition when the serving cell is a high-orbit satellite cell and the reselection priority of the high-orbit satellite cell is lower than that of the low-orbit satellite cell.

[0214] S202. The terminal device performs cell reselection between multi-orbit satellite cells according to the cell reselection parameters.

[0215] In some embodiments, if the cell reselection parameters include priority parameters, the terminal device may perform cell reselection between multi-orbit satellite cells according to the priority parameters.

[0216] It should be noted that the process of the terminal device performing cell reselection between multi-orbit satellite cells according to the priority parameters will be described in detail in Figure 4 the embodiments.

[0217] In some embodiments, if the cell reselection parameters include type indication parameters, the terminal device may perform cell reselection between multi-orbit satellite cells according to the type indication parameters.

[0218] It should be noted that the process in which the terminal device performs cell reselection between multi-track satellite cells according to the type indication parameter will be described in detail in Figure 6 the embodiments.

[0219] The cell reselection method provided by the embodiments of the present application can avoid the terminal device from frequently performing the cell reselection process, which is beneficial to reducing the power consumption of the terminal device and reducing the network signaling load, and improving the network stability.

[0220] In some embodiments, the interaction process between the network device and the terminal device can also be as Figure 4 shown in the embodiments, Figure 4 which is the second exemplary schematic diagram of a cell reselection method shown in the embodiments of the present application. Please refer to Figure 4 and the cell reselection method may include the following steps:

[0221] S401. The network device sends cell reselection parameters to the terminal device.

[0222] It should be noted that for the specific execution process of step S401, reference may be made to the specific execution process of step S201, which will not be elaborated here.

[0223] The cell reselection parameters may include priority parameters.

[0224] S402. The terminal device performs cell reselection between multi-track satellite cells according to the priority parameters in the cell reselection parameters.

[0225] In the case of the existence of at least one satellite neighbor cell, the terminal device may determine the reselection priority of the serving cell where the terminal device is located and the reselection priorities of each satellite neighbor cell according to the priority parameters, and perform cell reselection between multi-track satellite cells according to the reselection priority of the serving cell and the reselection priorities of each satellite neighbor cell.

[0226] If the serving cell where the terminal device camps is a low-earth orbit satellite cell, the terminal device performing cell reselection between multi-track satellite cells according to the reselection priority of the serving cell and the reselection priorities of each satellite neighbor cell may include the following scenarios:

[0227] Scenario 1: The satellite type corresponding to the serving cell where the terminal device is located is the same as the satellite type corresponding to the satellite neighbor cell, that is, the reselection priorities of the serving cell and the satellite neighbor cell are the same. For example, both the serving cell and the satellite neighbor cell are high-earth orbit satellite cells or low-earth orbit satellite cells.

[0228] In this scenario, the terminal device can determine whether to perform the measurement operation on the satellite neighbor cell according to the measurement result of the serving cell and the reselection threshold of the satellite neighbor cell. The measurement result of the serving cell includes at least one of the following: the signal level of the serving cell, the signal quality of the serving cell. The reselection threshold of the satellite neighbor cell includes at least one of the following: the reselection threshold based on level of the satellite neighbor cell, the reselection threshold based on quality of the satellite neighbor cell.

[0229] If the signal level of the serving cell is greater than the reselection threshold based on level of the satellite neighbor cell and the signal quality of the serving cell is greater than the reselection threshold based on quality of the satellite neighbor cell, the terminal device may not perform the measurement operation on the satellite neighbor cell; if the signal level of the serving cell is less than or equal to the reselection threshold based on level of the satellite neighbor cell, or the signal quality of the serving cell is less than or equal to the reselection threshold based on quality of the satellite neighbor cell, the terminal device performs the measurement operation on the satellite neighbor cell.

[0230] In some embodiments, when the residence time of the terminal device in the serving cell is greater than the preset time and the satellite neighbor cell meets the S - Criterion, the terminal device can determine whether to perform cell reselection to the satellite neighbor cell according to the sorted R value of the serving cell and the R value of the satellite neighbor cell within the timing duration of the timer for satellite cell reselection.

[0231] The S - Criterion is a judgment criterion for the terminal device to determine whether the serving cell meets the camping condition during the process of cell selection.

[0232] Optionally, if the R value of the serving cell < the R value of the satellite neighbor cell, the terminal device performs cell reselection to the satellite neighbor cell; if the R value of the serving cell ≥ the R value of the satellite neighbor cell, the terminal device does not perform cell reselection to the satellite neighbor cell.

[0233] Optionally, the preset time can be one of the following: the time configured by the network device, the time stipulated by the protocol. For example, the preset time can be 1 second.

[0234] Optionally, the timing duration of the timer can be one of the following: the timing duration configured by the network device, the timing duration stipulated by the protocol.

[0235] For example, when the terminal device stays in the serving cell for more than 1 s and the satellite neighbor cell meets the S - Criterion, within the timing duration of the timer for satellite cell reselection, the terminal device calculates the R values of the serving cell and the satellite neighbor cell respectively. If the R value of the satellite neighbor cell is greater than the R value of the serving cell, the terminal device reselects to the satellite neighbor cell; otherwise, the terminal does not reselect.

[0236] Scenario 2: The satellite types corresponding to the serving cell where the terminal device is located are different from those corresponding to the satellite neighbor cells, and there are the following three scenarios for the reselection priorities of the serving cell and the satellite neighbor cells:

[0237] Scenario 2-1: The reselection priority of the serving cell is the same as that of the satellite neighbor cell.

[0238] In this scenario, the terminal device can determine whether to perform the measurement operation on the satellite neighbor cell according to the measurement result of the serving cell and the reselection threshold of the satellite neighbor cell.

[0239] The measurement result of the serving cell may include the signal level and the signal quality; the reselection threshold of the satellite neighbor cell may include the level-based reselection threshold of the satellite neighbor cell and the quality-based reselection threshold of the satellite neighbor cell.

[0240] If the signal level of the serving cell is greater than the level-based reselection threshold of the satellite neighbor cell and the signal quality of the serving cell is greater than the quality-based reselection threshold of the satellite neighbor cell, the terminal device may not perform the measurement operation on the satellite neighbor cell; if the signal level of the serving cell is less than or equal to the level-based reselection threshold of the satellite neighbor cell, or the signal quality of the serving cell is less than or equal to the quality-based reselection threshold of the satellite neighbor cell, the terminal device performs the measurement operation on the satellite neighbor cell.

[0241] In some embodiments, when the residence time of the terminal device in the serving cell is greater than the preset time and the satellite neighbor cell meets the S criterion, the terminal device can determine whether to perform the cell reselection on the satellite neighbor cell according to the R value of the serving cell and the R value of the satellite neighbor cell within the timing duration of the timer for satellite cell reselection.

[0242] Optionally, if the R value of the serving cell ≥ the R value of the satellite neighbor cell, the terminal device does not perform the cell reselection on the satellite neighbor cell; if the R value of the serving cell < the R value of the satellite neighbor cell, the terminal device performs the cell reselection on the satellite neighbor cell.

[0243] Scenario 2-2: The reselection priority of the serving cell is higher than that of the satellite neighbor cell.

[0244] In this scenario, the process by which the terminal device determines whether to perform the measurement operation on the satellite neighbor cell can refer to the process by which the terminal device determines whether to perform the measurement operation on the satellite neighbor cell in Scenario 2-1, and will not be elaborated here.

[0245] In some embodiments, when the residence time of the terminal device in the serving cell is greater than the preset time, the terminal device can determine whether to perform the cell reselection on the satellite neighbor cell according to the measurement result of the serving cell and the low-priority threshold, and the measurement result of the satellite neighbor cell and the low-priority threshold within the timing duration of the timer for satellite cell reselection.

[0246] The low - priority threshold of the serving cell can be used to determine whether the signal of the serving cell meets the reselection condition when the reselection priority of the serving cell is higher than that of the satellite neighbor cell.

[0247] The measurement result of the serving cell can include at least one of the following: signal level, signal quality. Similarly, the low - priority threshold of the serving cell can include one of the following: the level - based low - priority threshold of the serving cell, the quality - based low - priority threshold of the serving cell.

[0248] The low - priority threshold of the satellite neighbor cell can be used to determine whether the signal of the satellite neighbor cell meets the reselection condition when the reselection priority of the serving cell is higher than that of the satellite neighbor cell.

[0249] The measurement result of the satellite neighbor cell can include at least one of the following: signal level, signal quality. Similarly, the low - priority threshold of the satellite neighbor cell can include one of the following: the level - based low - priority threshold of the satellite neighbor cell, the quality - based low - priority threshold of the satellite neighbor cell.

[0250] Optionally, if the measurement result of the serving cell < the low - priority threshold of the serving cell and the measurement result of the satellite neighbor cell > the low - priority threshold of the satellite neighbor cell, the terminal device performs cell reselection to the satellite neighbor cell; if the measurement result of the serving cell ≥ the low - priority threshold of the serving cell or the measurement result of the satellite neighbor cell ≤ the low - priority threshold of the satellite neighbor cell, the terminal device does not perform cell reselection to the satellite neighbor cell.

[0251] Scenario 2 - 3: The reselection priority of the serving cell is lower than that of the satellite neighbor cell.

[0252] In this scenario, the terminal device always needs to measure the satellite neighbor cell.

[0253] In some embodiments, when the residence time of the terminal device in the serving cell is greater than a preset time, the terminal device can determine whether to perform cell reselection to the satellite neighbor cell according to the measurement result of the satellite neighbor cell and a first threshold value within the timing duration of a timer for satellite cell reselection.

[0254] Optionally, if the measurement result of the satellite neighbor cell > the first threshold value, the terminal device performs cell reselection to the satellite neighbor cell, that is, the terminal device reselects to the satellite neighbor cell; if the measurement result of the satellite neighbor cell ≤ the first threshold value, the terminal device does not perform cell reselection to the satellite neighbor cell, that is, the terminal device continues to camp on the serving cell.

[0255] The measurement result of the satellite neighbor cell can include at least one of the following: signal level, signal quality.

[0256] It should be noted that the content of the preset duration and the timing duration in Scenario 2 (including Scenario 2-1, Scenario 2-2, and Scenario 2-3) can refer to the content of the preset duration and the timing duration in Scenario 1, and will not be elaborated here. The content of the first threshold value in Scenario 2-3 can refer to the content of the first threshold value in step S201, and will not be elaborated here.

[0257] In the cell reselection method provided by the embodiments of the present application, the terminal device can determine the reselection priority of the serving cell where the terminal device is located and the reselection priority of the satellite neighbor cell according to the priority parameter in the cell reselection parameters, and determine whether to perform cell reselection according to the comparison result of the reselection priority of the serving cell and the reselection priority of the satellite neighbor cell, so as to avoid the terminal device from frequently performing the cell reselection process, which is beneficial to reducing the power consumption of the terminal device and reducing the network signaling load, and improving the network stability.

[0258] In some embodiments, when the serving cell where the terminal device is located is a low-earth orbit satellite cell, the interaction process between the network device and the terminal device can also be as Figure 5 shown in the embodiment, Figure 5 which is the third exemplary diagram of a cell reselection method shown in the embodiments of the present application. Please refer to Figure 5 , and the cell reselection method may include the following steps:

[0259] S501. The network device sends cell reselection parameters to the terminal device.

[0260] The serving cell refers to the cell where the terminal device is currently camped.

[0261] In some embodiments, the cell reselection parameters may include but are not limited to: priority parameter, type indication parameter, first threshold value.

[0262] It should be noted that the specific execution process of step S501 can refer to the specific execution process of step S201, and will not be elaborated here.

[0263] S502. When the serving cell where the terminal device is located is a low-earth orbit satellite cell and the priority parameter included in the cell reselection parameters indicates that the reselection priority of the high-earth orbit satellite cell is higher than the reselection priority of the low-earth orbit satellite cell, the terminal device measures the high-earth orbit satellite cell corresponding to the low-earth orbit satellite cell where the terminal device is located, and obtains the measurement result of the high-earth orbit satellite cell.

[0264] For example, the serving cell where the terminal device is located is a low-earth orbit satellite cell, and this low-earth orbit satellite cell can be Figure 3 the satellite neighbor cell 2 in, and the high-earth orbit satellite cell corresponding to this low-earth orbit satellite cell can be Figure 3 the serving cell and satellite neighbor cell 1 in.

[0265] Optionally, the terminal device may determine whether the serving cell where the terminal device is located is a low-earth orbit satellite cell according to the type indication parameter in the cell reselection parameter.

[0266] Optionally, the terminal device may determine the reselection priority of the low-earth orbit satellite cell where the terminal device is located and the reselection priority of the geostationary orbit satellite cell according to the priority parameter, and determine whether to perform cell reselection according to the reselection priority of the low-earth orbit satellite cell and the reselection priority of the geostationary orbit satellite cell.

[0267] In some embodiments, the active terminal device may obtain the measurement configuration information of the geostationary orbit satellite cell from the network device corresponding to the serving cell, and measure the geostationary orbit satellite cell based on the measurement configuration information of the geostationary orbit satellite cell.

[0268] The measurement result may include at least one of the following of the geostationary orbit satellite cell: signal quality, signal level.

[0269] S503. The terminal device performs cell reselection according to the measurement result of the geostationary orbit satellite cell.

[0270] Optionally, when the measurement result of the geostationary orbit satellite cell is greater than the first threshold, the terminal device reselects to the geostationary orbit satellite cell.

[0271] Optionally, when the measurement result of the geostationary orbit satellite cell is less than or equal to the first threshold, the terminal device will not perform cell reselection but continue to camp on the low-earth orbit satellite cell.

[0272] The first threshold is used to trigger cell reselection to the geostationary orbit satellite cell.

[0273] It should be noted that the relevant content of the first threshold in this step may refer to the relevant content of the first threshold in step S201, and will not be elaborated here.

[0274] When the terminal device is in the idle state or the non-active state, cell reselection needs to be continuously performed. In the case of lack of terrestrial network coverage and no clear service requirements for the terminal device, in the face of different satellite cells, due to the wide coverage characteristics of GEO satellites, the terminal device may camp on the geostationary orbit satellite cell first when it is just powered on or just resumes from the connected state to the non-connected state.

[0275] The cell reselection method provided by the embodiments of this application, in the case of lack of terrestrial network coverage and when the serving cell where the terminal device is located is a low-earth orbit satellite cell, the idle-state or inactive-state terminal device supporting multi-orbit satellite access can, according to the priority parameter in the cell reselection parameters, preferentially reselect to a geostationary orbit satellite cell during the process of cell reselection, so as to reduce the number of cell reselections, avoid the terminal device from frequently performing the cell reselection process, which is beneficial to reducing the power consumption of the terminal device and reducing the network signaling load, and improving network stability.

[0276] In some embodiments, when the frequencies between the serving cell where the terminal device is located and the satellite neighbor cell are different, a reselection mechanism based on frequency priority can be adopted for cell reselection, so that the terminal device preferentially reselects to a geostationary orbit satellite cell; when the frequencies between the serving cell where the terminal device is located and the satellite neighbor cell are the same, a reselection mechanism based on frequency priority can be adopted, and the Q-Offset parameter sent by the system broadcast message for different cells using the R criterion can be used to set the offset between cells, so that the terminal device preferentially reselects to a geostationary orbit satellite cell.

[0277] Case 1: The frequency priority of the serving cell is different from that of the satellite neighbor cell.

[0278] In this case, the frequency priority of the geostationary orbit satellite cell can be set to be higher than that of the non-geostationary orbit satellite cell (for example, a low-earth orbit satellite cell), so that the terminal device can preferentially reselect to the geostationary orbit satellite cell during the process of cell reselection using the reselection mechanism based on frequency priority.

[0279] For example, if the serving cell is a geostationary orbit satellite cell and the satellite neighbor cell is a low-earth orbit satellite cell, since the frequency priority of the geostationary orbit satellite cell is higher than that of the low-earth orbit satellite cell, the terminal device can not perform cell reselection and continue to camp on the serving cell. If the satellite neighbor cell is a geostationary orbit satellite cell and the serving cell is a low-earth orbit satellite cell, since the frequency priority of the geostationary orbit satellite cell is higher than that of the low-earth orbit satellite cell, the terminal device can perform cell reselection and reselect to the satellite neighbor cell.

[0280] Case 2: The frequency priority of the serving cell is the same as that of the satellite neighbor cell.

[0281] In this case, the terminal device can compare the measurement result of the serving cell with the reselection threshold of the satellite neighbor cell to determine whether to perform the measurement operation on the satellite neighbor cell.

[0282] The measurement result of the serving cell can include the signal level and signal quality of the serving cell; the reselection threshold of the satellite neighbor cell can include the reselection threshold based on level and the reselection threshold based on quality of the satellite neighbor cell.

[0283] If the signal level of the serving cell is greater than the level-based reselection threshold of the satellite neighbor cell and the signal quality of the serving cell is greater than the quality-based reselection threshold of the satellite neighbor cell, the terminal device may not perform the measurement operation on the satellite neighbor cell; if the signal level of the serving cell is less than or equal to the level-based reselection threshold of the satellite neighbor cell, or the signal quality of the serving cell is less than or equal to the quality-based reselection threshold of the satellite neighbor cell, the terminal device performs the measurement operation on the satellite neighbor cell.

[0284] In some embodiments, when the residence time of the terminal device in the serving cell is greater than a preset time and the satellite neighbor cell meets the S criterion, the terminal device may calculate the R value of the serving cell and the first R value of the satellite neighbor cell within the timing duration of the timer for satellite cell reselection; and determine the second R value of the satellite neighbor cell according to the first R value of the satellite neighbor cell and the cell offset value (Q-Offset) parameter; and determine whether to perform cell reselection on the satellite neighbor cell according to the R value of the serving cell and the second R value of the satellite neighbor cell.

[0285] In some embodiments, the network device may send a system broadcast message to the terminal device, and the system broadcast message may include the cell offset value (Q-Offset) parameter.

[0286] The reselection priority decision condition of the satellite neighbor cell can be adjusted by the Q-Offset parameter. That is, if the satellite neighbor cell is a high-orbit satellite cell and the serving cell is a low-orbit satellite cell, the parameter value of the Q-Offset parameter should be as low as possible, so as to achieve the purpose that the terminal device preferentially reselects to the high-orbit satellite cell.

[0287] Optionally, if the second R value of the satellite neighbor cell > the R value of the serving cell, the terminal device performs cell reselection on the satellite neighbor cell; if the second R value of the satellite neighbor cell ≤ the R value of the serving cell, the terminal device does not perform cell reselection on the satellite neighbor cell.

[0288] In the embodiments of the present application, when the frequency priorities of the serving cell and the satellite neighbor cell of the terminal device are the same, the system broadcast message sent by the network device to the terminal device may carry the Q-Offset parameter, and the Q-Offset parameter can be used to adjust the decision condition of the reselection priority of the satellite neighbor cell to achieve the tendency adjustment of the reselection priority between multi-orbit satellite cells.

[0289] In some embodiments, the terminal device may also make the terminal device preferentially reselect to a high-orbit satellite cell in the following manner: The terminal device only searches for high-orbit (GEO) satellite network frequency points. For example, the frequency point information is preset through a Subscriber Identity Module (SIM) card or a configuration file (e.g., to improve the search efficiency). The terminal device always measures the high-orbit satellite cell corresponding to the serving cell; and, when the residence time of the terminal device in the serving cell is greater than a preset time, the terminal device may, within the timing duration of the timer for satellite cell reselection, determine whether to perform cell reselection to the high-orbit satellite cell according to the measurement result of the high-orbit satellite cell and the high-orbit satellite cell threshold.

[0290] The measurement result of the high-orbit satellite cell may include at least one of the following: signal level, signal quality. Similarly, the high-orbit satellite cell threshold may include one of the following: high-orbit satellite cell threshold based on level, high-orbit satellite cell threshold based on quality.

[0291] For example, when the residence time of the terminal device in the serving cell is greater than 1 s, within the timing duration of the satellite cell reselection timer, if the measurement result of the high-orbit satellite cell > the high-orbit satellite cell threshold, the terminal device reselects to the high-orbit satellite cell; if the measurement result of the high-orbit satellite cell ≤ the high-orbit satellite cell threshold, the terminal device does not perform cell reselection to the high-orbit satellite cell.

[0292] In some embodiments, the interaction process between the network device and the terminal device may also be as Figure 6 shown in the embodiment Figure 6 which is the fourth exemplary diagram of a cell reselection method shown in the embodiments of the present application. Please refer to Figure 6 The cell reselection method may include the following steps:

[0293] S601. The network device sends cell reselection parameters to the terminal device.

[0294] It should be noted that for the specific execution process of step S601, reference may be made to the specific execution process of step S201, which will not be elaborated here.

[0295] The cell reselection parameters may include a type indication parameter. The relevant content of the type indication parameter may refer to the relevant content of the type indication parameter in step S201, which will not be elaborated here.

[0296] S602. The terminal device performs cell reselection between multi-orbit satellite cells according to the type indication parameter in the cell reselection parameters.

[0297] Optionally, the terminal device may determine the satellite type corresponding to the serving cell where the terminal device is located according to the type indication parameter, and perform cell reselection between multi-orbit satellite cells according to the satellite type of the serving cell and the service of the terminal device.

[0298] In some embodiments, the cell reselection parameter may further include indication information, and the indication information may be used to indicate the determination process of the satellite type corresponding to the serving cell where the terminal device is located.

[0299] Exemplarily, the determination process may be: the terminal device may obtain the NTN configuration parameters required for the terminal device to access NR through the ntn-Config message in SIB19; the terminal device calculates according to the NTN configuration parameters, and determines the satellite type corresponding to the serving cell where the terminal device is located according to the calculation result.

[0300] The terminal device may obtain the indication information in the cell reselection parameter, and determine the satellite type corresponding to the serving cell where the terminal device is currently camped according to the determination process indicated by the indication information.

[0301] Optionally, the terminal device may determine the service supported by the serving cell where the terminal device is located according to the correspondence between the satellite type and the supported service (for example, Table 4); perform cell reselection according to the matching result between the service supported by the serving cell and the service of the terminal device.

[0302] For example, if a terminal device supporting the high-low orbit reselection optimization function needs to initiate a service requirement (such as paging or download service sent by the network side), the terminal device supporting the high-low orbit reselection optimization function needs to determine whether the service supported by the currently camped serving cell can meet the service requirement that the terminal device needs to initiate, and determine whether to perform cell reselection according to the judgment result.

[0303] If the service supported by the serving cell matches the service of the terminal device, it means that the service supported by the serving cell meets the service requirement of the terminal device, and the terminal device does not perform cell reselection; if the service supported by the serving cell does not match the service of the terminal device, it means that the service supported by the serving cell does not meet the service requirement of the terminal device, and the terminal device performs cell reselection.

[0304] Assume that the service of the terminal device is one of the following: high-bandwidth service, high-rate service, delay-sensitive service, low-latency service. According to the correspondence between the satellite cell, satellite type and supported service shown in Table 4, if the terminal device is currently camped in a high-orbit satellite cell, the service supported by the high-orbit satellite cell will not be able to meet the service requirement of the terminal device, and the terminal device needs to reselect to a low-orbit satellite cell; if the terminal device is currently camped in a low-orbit satellite cell, the low-orbit satellite cell can meet the service requirement of the terminal device, and the terminal device can initiate access.

[0305] Assume that the services of the terminal device are one of the following: services with high signal stability requirements, services with high signal reliability requirements. According to the correspondence between satellite cells, satellite types, and supported services shown in Table 4, if the terminal device is currently camped on a geostationary satellite cell, the services supported by the geostationary satellite cell meet the service requirements of the terminal device, and the terminal device continues to camp on the geostationary satellite cell; if the terminal device is currently camped on a low-earth orbit satellite cell, the low-earth orbit satellite cell will not be able to meet the service requirements of the terminal device, and the terminal device needs to reselect to a geostationary satellite cell.

[0306] The services supported by high and low orbit satellite cells vary greatly, so there may be a situation where the services supported by the serving cell where the terminal device is currently camped do not match the service requirements of the terminal device. If the terminal device initiates access in the currently camped serving cell first and then initiates the service after switching to a suitable cell, the user experience will be reduced. In the cell reselection method provided by the embodiments of the present application, in the case of lack of terrestrial network coverage, the terminal device can determine the satellite type of the serving cell where the terminal device is located according to the type indication parameter in the priority parameter sent by the network device, and then determine whether the service supported by the serving cell where the terminal device is located matches the service executed by the terminal device based on the satellite type, so that when the service supported by the currently camped serving cell of the terminal device does not match the service requirements of the terminal device, the terminal device can reselect to a suitable cell, which is beneficial to improving the cell reselection efficiency and the user experience.

[0307] In some embodiments, when the serving cell where the terminal device is located is a geostationary satellite cell, the interaction process between the network device and the terminal device can also be as Figure 7 shown in the embodiment Figure 7 which is the fifth exemplary schematic diagram of a cell reselection method shown in the embodiments of the present application. Please refer to Figure 7 and this cell reselection method may include the following steps:

[0308] S701. The network device corresponding to the serving cell sends cell reselection parameters to the terminal device.

[0309] The serving cell is the cell where the terminal device is currently camped.

[0310] It should be noted that for the specific execution process of step S701, reference can be made to the specific execution process of step S201, which will not be elaborated here.

[0311] In some embodiments, the cell reselection parameters may include: priority parameter, type indication parameter, candidate cell list, second threshold, and third threshold.

[0312] S702. When the serving cell where the terminal device is located is a high-orbit satellite cell, the terminal device measures the low-orbit satellite cell corresponding to the high-orbit satellite cell where the terminal device is located to obtain the measurement result of the low-orbit satellite cell.

[0313] For example, the serving cell where the terminal device is located is a high-orbit satellite cell, and this high-orbit satellite cell can be the Figure 3 serving cell in, and the low-orbit satellite cell corresponding to this high-orbit satellite cell can be the Figure 3 satellite neighbor cell 2 in.

[0314] Optionally, the terminal device can determine whether the serving cell where the terminal device is located is a high-orbit satellite cell according to the type indication parameter in the cell reselection parameter.

[0315] Optionally, the terminal device can determine at least one low-orbit satellite cell for which the terminal device can perform cell reselection according to the candidate cell list.

[0316] Optionally, the terminal device can determine the reselection priority of the high-orbit satellite cell where the terminal device is located and the reselection priority of the low-orbit satellite cell according to the priority parameter, and determine whether to perform cell reselection according to the reselection priority of the high-orbit satellite cell and the reselection priority of the low-orbit satellite cell.

[0317] In some embodiments, the active terminal device can request the network device corresponding to the serving cell to obtain the measurement configuration information of the low-orbit satellite cell, and measure the low-orbit satellite cell based on the measurement configuration information of the low-orbit satellite cell.

[0318] The measurement result of the low-orbit satellite cell can include at least one of the following of the low-orbit satellite cell: signal quality, signal level.

[0319] In some embodiments, when the service of the terminal device is a preset service, the terminal device can measure the low-orbit satellite cell corresponding to the high-orbit satellite cell where the terminal device is located to obtain the measurement result of the low-orbit satellite cell.

[0320] Optionally, the preset service can include at least one of the following: low-latency service, high-rate service.

[0321] The data transmission delay of the low-latency service is less than or equal to a preset duration.

[0322] The data transmission rate of the high-rate service is greater than or equal to a preset rate.

[0323] Optionally, the preset duration and the preset rate can be determined by at least one of the following methods:

[0324] Method 1: Determine the preset duration and / or preset rate based on the received indication information, which can be sent by a network device and can be used to configure the preset duration and / or preset rate.

[0325] Method 2: Determine the preset duration based on the data transmission duration agreed upon by the protocol; and / or determine the preset rate based on the data transmission rate agreed upon by the protocol.

[0326] S703. The terminal device performs cell reselection according to the measurement results of the low-earth orbit satellite cell.

[0327] Optionally, when the measurement result of the low-earth orbit satellite cell is greater than the third threshold, reselection is made to the low-earth orbit satellite cell; when the measurement result of the low-earth orbit satellite cell is less than or equal to the third threshold, the terminal device will not perform cell reselection but continue to camp on the high-earth orbit satellite cell.

[0328] In some embodiments, the terminal device can perform cell reselection through the following steps: obtain the location of the terminal device and the ephemeris data of the low-earth orbit satellite corresponding to the low-earth orbit satellite cell; determine the distance between the terminal device and the low-earth orbit satellite according to the location of the terminal device and the ephemeris data; determine the remaining coverage duration of the terminal device in the low-earth orbit satellite cell according to the distance between the terminal device and the low-earth orbit satellite; when the remaining coverage duration is greater than the duration threshold, perform cell reselection according to the measurement results of the low-earth orbit satellite cell and the remaining coverage duration.

[0329] Optionally, the terminal device includes a positioning module, and the terminal device can determine its location based on this positioning module. For example, the positioning module can be a Global Positioning System (GPS) module.

[0330] Optionally, the terminal device can determine the cell data of at least one low-earth orbit satellite cell for which the terminal device can perform cell reselection according to the candidate cell list in the cell reselection parameters. For any low-earth orbit satellite cell, the cell data of this low-earth orbit satellite cell can include the ephemeris data of the low-earth orbit satellite corresponding to this low-earth orbit satellite cell.

[0331] Optionally, a distance algorithm can be configured in the terminal device, and the terminal device can determine the distance between the terminal device and the low-earth orbit satellite based on this distance algorithm, through the location of the terminal device and the ephemeris data. This distance algorithm can be any algorithm that can be used to determine the distance between the terminal device and the low-earth orbit satellite, and the type of the distance algorithm is not limited in the embodiments of this application.

[0332] As the LEO satellite moves, the beam of the LEO satellite on the ground also moves and changes, making the service of the LEO satellite to a specified area on the ground time-limited. In this method, the remaining duration for the LEO satellite's coverage area to stay in the area where the terminal device is located can be calculated based on the ephemeris data of the LEO satellite's orbital motion and the position of the terminal device, that is, the remaining coverage duration. After exceeding the remaining coverage duration, the LEO satellite's coverage area will no longer cover the area where the terminal device is located, so that the LEO satellite cannot provide services to the terminal device. That is to say, the remaining coverage duration can indicate the remaining duration for the LEO satellite to provide services to the area where the terminal device is located.

[0333] Optionally, the remaining coverage duration may satisfy the following formula:

[0334]

[0335] Wherein, can represent the remaining coverage duration; can represent the radius of the earth, and the value can be 6371 kilometers; can represent the distance between the terminal device and the LEO satellite; can represent a compensation factor, and the value can be negative. For example, ; can represent the difference between the current time and the start time when the LEO satellite's coverage area enters the area where the terminal device is located, and this start time can be obtained through the broadcast message on the network side; can represent the acceleration due to gravity; can represent the mass of the earth.

[0336] Optionally, when the remaining coverage duration is greater than the duration threshold, the terminal device can determine the cell reselection index value of the LEO satellite according to the measurement results of the LEO satellite cell and the remaining coverage duration; and perform cell reselection according to the cell reselection index value and the fourth threshold.

[0337] In some embodiments, the duration threshold can be configured by the network device, and this duration threshold can be used for the terminal device to complete at least one preset process. The preset process can include but is not limited to at least one of the following: uplink and downlink synchronization process, random access process.

[0338] The fourth threshold can be used to determine whether the signal of the LEO satellite cell meets the reselection condition when the remaining coverage duration of the LEO satellite cell is less than the duration threshold.

[0339] In some embodiments, the cell reselection index value may satisfy the following formula:

[0340]

[0341] Among them, can represent the cell reselection index value of the low-earth orbit satellite cell; can represent the signal quality weight, ; can represent the signal quality and / or signal level in the measurement result of the low-earth orbit satellite cell; can represent the maximum signal quality reference value; can represent the duration weight, , ; can represent the remaining coverage duration; can be the minimum coverage duration reference value.

[0342] Optionally, the network device can send configuration information to the terminal device according to the service requirements of the terminal device, and the configuration information can be used to configure at least one of the following parameters: .

[0343] In some embodiments, the terminal device can measure the geostationary satellite cell to obtain the measurement result of the geostationary satellite cell; and perform cell reselection according to the measurement result of the low-earth orbit satellite cell and the measurement result of the geostationary satellite cell.

[0344] The measurement result of the geostationary satellite cell can include at least one of the following of the geostationary satellite cell: signal quality, signal level.

[0345] The measurement result of the low-earth orbit satellite cell can include at least one of the following of the low-earth orbit satellite cell: signal quality, signal level.

[0346] Optionally, when the measurement result of the geostationary satellite cell is less than the second threshold and the measurement result of the low-earth orbit satellite cell is greater than the third threshold, the terminal device reselects to the low-earth orbit satellite cell; if the measurement result of the geostationary satellite cell is greater than or equal to the second threshold or the measurement result of the low-earth orbit satellite cell is less than or equal to the third threshold, the terminal device will not perform cell reselection but continue to camp on the geostationary satellite cell.

[0347] It should be noted that the relevant content of the second threshold and the third threshold in this step can refer to the relevant content of the second threshold and the third threshold in step S201, and will not be elaborated here.

[0348] S704. After the terminal device reselects to the low-earth orbit satellite cell, the terminal device sends a connection request to the network device corresponding to the low-earth orbit satellite cell.

[0349] In some embodiments, the terminal device can initiate a random access request to the network device corresponding to the low-earth orbit satellite cell.

[0350] In some embodiments, step S704 is optional and can be omitted or replaced in different embodiments.

[0351] For the cell reselection method provided in the embodiments of the present application, if there is a lack of terrestrial network coverage and the serving cell where the terminal device is located is a high-orbit satellite cell, a terminal device in the idle state or inactive state that supports multi-orbit satellite access can, when a preset service needs to be executed, reselect to a low-orbit satellite cell according to the cell reselection parameters sent by the network device, so that the service supported by the cell where the terminal device camps is adapted to the service requirements of the terminal device, which is beneficial to improving the cell reselection efficiency, enhancing the user experience, reducing the power consumption of the terminal device, and reducing the network signaling load.

[0352] In some embodiments, a terminal device in the idle state or inactive state needs to continuously perform cell reselection. In the case of a lack of terrestrial network coverage, to ensure that the service of the terminal device matches the service supported by the satellite cell where the terminal device camps, the terminal device can query the underlying information through the application layer, decide whether to first perform cell reselection between multi-orbit satellite cells, and then instruct the underlying layer to perform access, so as to improve the user experience. Next, in combination with Figure 8 , this process will be described in detail.

[0353] Figure 8 is the sixth exemplary schematic diagram of a cell reselection method shown in the embodiments of the present application. Please refer to Figure 8 , this cell reselection method may include the following steps:

[0354] S801. After the application layer of the terminal device receives a user-triggered operation request, the application layer sends a query request to the access layer of the terminal device.

[0355] Exemplarily, the operation request may include, but is not limited to, a call request.

[0356] The query request can be used to query the cell status information corresponding to the terminal device, where the cell status information includes the status information of the serving cell and the status information of the neighboring cells corresponding to the serving cell.

[0357] The serving cell may be the cell where the terminal device currently camps.

[0358] Both the serving cell and the neighboring cells can provide communication services for the terminal device, that is, the terminal device can be both within the coverage area of the serving cell and within the coverage area of the neighboring cells. For example, the neighboring cells may be Figure 3 satellite neighboring cell 1 and satellite neighboring cell 2 in

[0359] Optionally, the status information of the serving cell may include signal quality, the network type corresponding to the serving cell, etc.

[0360] Optionally, the status information of neighboring cells may include signal quality, priority, load, etc.

[0361] Optionally, the signal quality may include at least one of the following: Reference Signal Received Power (RSRP), Reference Signal Received Quality (RSRQ), Signal-to-Interference-plus-Noise Ratio (SINR).

[0362] Optionally, if the serving cell is a satellite cell, the network type corresponding to the serving cell may be at least one of the following: high-orbit satellite network, low-orbit satellite network.

[0363] S802. The access layer sends the cell status information to the application layer.

[0364] S803. The application layer determines whether to trigger cell reselection between multi-orbit satellite cells according to the cell status information and the services of the terminal device.

[0365] The application layer may determine the satellite type corresponding to the serving cell according to the cell status information, and determine whether the services supported by the satellite type corresponding to the serving cell match the service requirements of the terminal device. If they match, cell reselection between multi-orbit satellite cells is not triggered; if they do not match, cell reselection between multi-orbit satellite cells is triggered.

[0366] Exemplarily, when the serving cell where the terminal device is located is a high-orbit satellite cell, if the service requirement of the terminal device is a low-latency and high-bandwidth service requirement, or the frequency band of the high-orbit satellite cell does not match the frequency band of the service requirement of the terminal device, cell reselection between multi-orbit satellite cells is triggered.

[0367] In the case where cell reselection between multi-orbit satellite cells is not triggered, if the signal quality of the serving cell is good, the application layer may directly perform an access operation to access the serving cell.

[0368] S804. The application layer sends a first instruction to the access layer.

[0369] The first instruction may be used to indicate whether the access layer performs cell reselection between multi-orbit satellite cells.

[0370] Optionally, the first instruction may include a first indication parameter, and the first indication parameter may be used to indicate whether the access layer performs cell reselection between multi-orbit satellite cells.

[0371] If the value of the first indication parameter is the first numerical value (for example, 0), it indicates that the access layer performs cell reselection between multi-track satellite cells; if the value of the first indication parameter is the second numerical value (for example, 1), it indicates that the access layer does not perform cell reselection between multi-track satellite cells.

[0372] S805. When the first instruction indicates to perform cell reselection between multi-track satellite cells, the access layer sends the satellite cell reselection result to the application layer.

[0373] Optionally, the satellite cell reselection result can be used to indicate whether the terminal device has selected a reselection cell.

[0374] Optionally, when a reselection cell is selected, the satellite cell reselection result can include at least one of the following: the identity (Identity document, ID) of the reselection cell, the satellite type corresponding to the reselection cell, and the signal quality of the reselection cell.

[0375] The identity of the reselection cell can be the name or index of the reselection cell.

[0376] When a reselection cell is selected, the application layer can perform step S806.

[0377] S806. The application layer sends a second instruction to the access layer according to the satellite cell reselection result.

[0378] The second instruction is used to indicate whether the access layer performs satellite cell access operations.

[0379] Optionally, the second instruction can include at least one of the following: a second indication parameter, the ID of the reselection cell, the satellite type corresponding to the reselection cell, and the signal quality of the reselection cell.

[0380] The second indication parameter can be used to indicate whether the access layer performs satellite cell access operations. If the value of the second indication parameter is the third numerical value (for example, 0), it indicates that the access layer performs satellite cell access operations; if the value of the second indication parameter is the fourth numerical value (for example, 1), it indicates that the access layer does not perform satellite cell access operations.

[0381] S807. When the second instruction indicates to perform satellite cell access operations, the access layer sends the satellite cell access result to the application layer.

[0382] Optionally, the satellite cell access result can be used to indicate whether the satellite cell access is successful.

[0383] S808. After the application layer determines that the satellite cell access is successful according to the satellite cell access result, it executes the operation request triggered by the user.

[0384] Optionally, after determining that the satellite cell access fails according to the satellite cell access result, the application layer may re-trigger cell reselection between multi-track satellite cells (step S804 above), and / or the application layer generates a prompt message.

[0385] The prompt message may be used to indicate that the operation request execution fails. For example, the prompt message may be: The current voice call request fails.

[0386] S809. When the application layer fails to execute the operation request triggered by the user, the application layer re-triggers cell reselection between multi-track satellite cells, and / or the application layer generates a prompt message.

[0387] The prompt message may be used to indicate that the operation request execution fails.

[0388] In the cell reselection method provided by the embodiments of the present application, the terminal device can directly control the tendency adjustment of the reselection priority for cell reselection of the terminal device through the interaction between its own access layer and application layer, without the need for a network device to control the tendency adjustment of the reselection priority for cell reselection of the terminal device, making the cell reselection of the terminal device more flexible and convenient, and also enabling the terminal device to flexibly perform cell reselection according to its own service requirements, which is beneficial to improving the user experience, reducing the power consumption of the terminal device and reducing the network signaling load.

[0389] The cell reselection method provided by the embodiments of the present application can be applied to a high-low orbit satellite system, which can make the terminal device more directly and efficiently control the tendency of the reselection priority during the cell reselection process in the high-low orbit satellite system.

[0390] In some embodiments, when the serving cell of the terminal device is a high-orbit satellite cell, the interaction process between the network device and the terminal device may also be as Figure 9 shown in the embodiment Figure 9 which is the seventh exemplary diagram of a cell reselection method shown in the embodiments of the present application. Please refer to Figure 9 , and the cell reselection method may include the following steps:

[0391] S901. The network device sends cell reselection parameters to the terminal device.

[0392] The network device in this step may be the network device corresponding to the serving cell of the terminal device, and the serving cell refers to the cell where the terminal device currently camps.

[0393] In some embodiments, the cell reselection parameters may include: a priority parameter, a type indication parameter.

[0394] It should be noted that for the specific execution process of step S901, reference can be made to the specific execution process of step S201, which will not be elaborated here.

[0395] S902. When the serving cell where the terminal device is located is a high-orbit satellite cell and the priority parameter in the cell reselection parameters indicates that the reselection priority of the low-orbit satellite cell is higher than that of the high-orbit satellite cell, the terminal device performs cell reselection.

[0396] Optionally, the priority parameter may indicate that the reselection priority of the low-orbit satellite cell is the highest. That is to say, the reselection priority of the low-orbit satellite cell is higher than that of non-low-orbit satellite cells (for example, medium-orbit satellite cells or high-orbit satellite cells).

[0397] In some embodiments, the terminal device may determine whether to perform cell reselection for a satellite neighbor cell according to the frequency point of the serving cell and the frequency point of the satellite neighbor cell. The specific scenarios are as follows:

[0398] Scenario 1: The frequency point of the serving cell where the terminal device is located is the same as the frequency point of the satellite neighbor cell, indicating that the reselection priority of the serving cell is the same as that of the satellite neighbor cell.

[0399] In this scenario, the terminal device may determine whether to perform a measurement operation on the co-frequency satellite neighbor cell according to the measurement result of the serving cell and the reselection threshold of the co-frequency satellite neighbor cell.

[0400] The measurement result of the serving cell may include the signal level and signal quality of the serving cell.

[0401] The reselection threshold of the co-frequency satellite neighbor cell may include the quality-based reselection threshold and the level-based reselection threshold of the co-frequency satellite neighbor cell.

[0402] If the signal level of the serving cell is greater than the level-based reselection threshold of the co-frequency satellite neighbor cell and the signal quality of the serving cell is greater than the quality-based reselection threshold of the co-frequency satellite neighbor cell, the terminal device may not perform a measurement operation on the co-frequency satellite neighbor cell; if the signal level of the serving cell is less than or equal to the level-based reselection threshold of the co-frequency satellite neighbor cell, or the signal quality of the serving cell is less than or equal to the quality-based reselection threshold of the co-frequency satellite neighbor cell, the terminal device performs a measurement operation on the co-frequency satellite neighbor cell.

[0403] In some embodiments, when the residence time of the terminal device in the serving cell is greater than the preset time and the co-frequency satellite neighbor cell meets the S criterion, the terminal device may determine whether to perform cell reselection for the co-frequency satellite neighbor cell according to the R value of the serving cell and the R value of the co-frequency satellite neighbor cell within the timing duration of the timer for satellite cell reselection.

[0404] Optionally, if the R value of the serving cell ≥ the R value of the co-frequency satellite neighbor cell, the terminal device does not perform cell reselection for the co-frequency satellite neighbor cell; if the R value of the serving cell < the R value of the co-frequency satellite neighbor cell, the terminal device performs cell reselection for the co-frequency satellite neighbor cell.

[0405] Scenario 2: The frequency point of the serving cell where the terminal device is located is different from the frequency point of the satellite neighbor cell. There are the following three scenarios for the reselection priorities of the serving cell and the different-frequency satellite neighbor cell:

[0406] Scenario 2-1: The reselection priority of the serving cell is the same as the reselection priority of the different-frequency satellite neighbor cell.

[0407] In this scenario, the terminal device can determine whether to perform measurement operations on the different-frequency satellite neighbor cell according to the measurement results of the serving cell and the reselection threshold of the different-frequency satellite neighbor cell.

[0408] The measurement results of the serving cell may include the signal level and signal quality of the serving cell.

[0409] The reselection threshold of the different-frequency satellite neighbor cell may include the quality-based reselection threshold and the level-based reselection threshold of the different-frequency satellite neighbor cell.

[0410] If the signal level of the serving cell is greater than the level-based reselection threshold of the different-frequency satellite neighbor cell and the signal quality of the serving cell is greater than the quality-based reselection threshold of the different-frequency satellite neighbor cell, the terminal device may not perform measurement operations on the different-frequency satellite neighbor cell; if the signal level of the serving cell is less than or equal to the level-based reselection threshold of the different-frequency satellite neighbor cell, or the signal quality of the serving cell is less than or equal to the quality-based reselection threshold of the different-frequency satellite neighbor cell, the terminal device performs measurement operations on the different-frequency satellite neighbor cell.

[0411] In some embodiments, when the residence time of the terminal device in the serving cell is greater than a preset time and the different-frequency satellite neighbor cell meets the S criterion, the terminal device may determine whether to perform cell reselection for the different-frequency satellite neighbor cell according to the R value of the serving cell and the R value of the different-frequency satellite neighbor cell within the timing duration of the timer for satellite cell reselection.

[0412] Optionally, if the R value of the serving cell ≥ the R value of the different-frequency satellite neighbor cell, the terminal device does not perform cell reselection for the different-frequency satellite neighbor cell; if the R value of the serving cell < the R value of the different-frequency satellite neighbor cell, the terminal device performs cell reselection for the different-frequency satellite neighbor cell.

[0413] Scenario 2-2: The reselection priority of the serving cell is higher than the reselection priority of the different-frequency satellite neighbor cell.

[0414] In this scenario, the process by which the terminal device determines whether to perform measurement operations on a different-frequency satellite neighbor cell can refer to the process by which the terminal device determines whether to perform measurement operations on a different-frequency satellite neighbor cell in Scenario 2-1, and will not be elaborated here.

[0415] In some embodiments, when the residence time of the terminal device in the serving cell is greater than a preset time, the terminal device can, within the timing duration of the timer for satellite cell reselection, determine whether to perform cell reselection on the different-frequency satellite neighbor cell according to the measurement results of the serving cell and the low-priority threshold, and the measurement results of the different-frequency satellite neighbor cell and the low-priority threshold.

[0416] Optionally, if the measurement result of the serving cell < the low-priority threshold of the serving cell and the measurement result of the different-frequency satellite neighbor cell > the low-priority threshold of the different-frequency satellite neighbor cell, the terminal device performs cell reselection on the different-frequency satellite neighbor cell; if the measurement result of the serving cell ≥ the low-priority threshold of the serving cell or the measurement result of the different-frequency satellite neighbor cell ≤ the low-priority threshold of the different-frequency satellite neighbor cell, the terminal device does not perform cell reselection on the different-frequency satellite neighbor cell.

[0417] The low-priority threshold of the serving cell can be used to determine whether the signal of the serving cell meets the reselection condition when the reselection priority of the serving cell is higher than that of the different-frequency satellite neighbor cell.

[0418] The low-priority threshold of the different-frequency satellite neighbor cell can be used to determine whether the signal of the different-frequency satellite neighbor cell meets the reselection condition when the reselection priority of the serving cell is higher than that of the different-frequency satellite neighbor cell.

[0419] The measurement results of the serving cell can include at least one of the following: signal level, signal quality. Similarly, the low-priority threshold of the serving cell can include one of the following: the level-based low-priority threshold of the serving cell, the quality-based low-priority threshold of the serving cell.

[0420] The measurement results of the different-frequency satellite neighbor cell can include at least one of the following: signal level, signal quality. Similarly, the low-priority threshold of the different-frequency satellite neighbor cell can include one of the following: the level-based low-priority threshold of the different-frequency satellite neighbor cell, the quality-based low-priority threshold of the different-frequency satellite neighbor cell.

[0421] The low-priority threshold of the serving cell and the low-priority threshold of the different-frequency satellite neighbor cell can be configured by the network device or set by the protocol.

[0422] Scenario 2-3: The reselection priority of the serving cell is lower than the reselection priority of the different-frequency satellite neighbor cell.

[0423] In this scenario, the terminal device always needs to measure the different-frequency satellite neighbor cell.

[0424] In some embodiments, when the duration for which the terminal device stays in the serving cell is greater than a preset duration, the terminal device may, within the timing duration of the timer for satellite cell reselection, determine whether to perform cell reselection to a satellite neighbor cell according to the measurement result of the inter-frequency satellite neighbor cell and the high-priority threshold of the inter-frequency satellite neighbor cell.

[0425] The high-priority threshold of the inter-frequency satellite neighbor cell can be used to determine whether the signal of the inter-frequency satellite neighbor cell meets the reselection condition when the reselection priority of the serving cell is lower than that of the inter-frequency satellite neighbor cell.

[0426] Optionally, if the measurement result of the inter-frequency satellite neighbor cell > the high-priority threshold of the inter-frequency satellite neighbor cell, the terminal device performs cell reselection to the inter-frequency satellite neighbor cell, that is, the terminal device reselects to the inter-frequency satellite neighbor cell; if the measurement result of the inter-frequency satellite neighbor cell ≤ the high-priority threshold of the inter-frequency satellite neighbor cell, the terminal device does not perform cell reselection to the inter-frequency satellite neighbor cell, that is, the terminal device continues to stay in the serving cell.

[0427] The high-priority threshold of the inter-frequency satellite neighbor cell can be configured by the network device or set by the protocol.

[0428] It should be noted that the content of the preset duration and the timing duration in this step can refer to the content of the preset duration and the timing duration in step S402, and will not be elaborated here.

[0429] For the cell reselection method provided in the embodiments of the present application, the terminal device can determine the reselection priority of the serving cell where the terminal device is located and the reselection priority of the satellite neighbor cell according to the priority parameter in the cell reselection parameter, and determine whether to perform cell reselection according to the comparison result of the reselection priority of the serving cell and the reselection priority of the satellite neighbor cell; or, the terminal device can also determine whether to perform cell reselection according to the frequency point of the serving cell and the frequency point of the satellite neighbor cell, so as to avoid the terminal device from frequently performing the cell reselection process, which is beneficial to reducing the power consumption of the terminal device and reducing the network signaling load, and improving the network stability.

[0430] Figure 10 This is one of the schematic structural diagrams of the cell reselection device provided in the embodiments of the present application. Please refer to Figure 10 , the cell reselection device 10 can be applied to the terminal device in the above embodiments, and the cell reselection device 10 may include:

[0431] A transceiver module 11, configured to receive cell reselection parameters sent by a network device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a list of candidate cells for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection to a low-orbit satellite cell;

[0432] A processing module 12, configured to perform cell reselection between multi-orbit satellite cells according to the cell reselection parameters.

[0433] In a possible implementation manner, the cell reselection parameters are included in a system message; or, the cell reselection parameters are included in a signaling.

[0434] In a possible implementation manner, the cell reselection parameters include a priority parameter; specifically, the processing module 12 is configured to:

[0435] Perform cell reselection between the multi-orbit satellite cells according to the priority parameter;

[0436] wherein the priority parameter is used to indicate the reselection priority of the multi-orbit satellite cells, and the multi-orbit satellite cells include at least one of the following: a high-orbit satellite cell, a low-orbit satellite cell.

[0437] In a possible implementation manner, the cell reselection parameters include a type indication parameter; specifically, the processing module 12 is further configured to:

[0438] Perform cell reselection between the multi-orbit satellite cells according to the type indication parameter;

[0439] wherein the type indication parameter is used to indicate the satellite type corresponding to the serving cell of the terminal device, and the satellite type includes at least one of the following: a high-orbit satellite, a low-orbit satellite.

[0440] In a possible implementation manner, the serving cell of the terminal device is a low-orbit satellite cell, and the cell reselection parameters include a priority parameter; specifically, the processing module 12 is further configured to:

[0441] When the priority parameter indicates that the reselection priority of the high-orbit satellite cell is higher than that of the low-orbit satellite cell, measure the high-orbit satellite cell corresponding to the low-orbit satellite cell where the terminal device is located to obtain a measurement result of the high-orbit satellite cell;

[0442] Perform cell reselection according to the measurement result of the high-orbit satellite cell.

[0443] In a possible implementation, the processing module 12 is further specifically configured to:

[0444] When the measurement result of the geostationary satellite cell is greater than the first threshold, reselect to the geostationary satellite cell;

[0445] Wherein, the measurement result includes at least one of the following: signal quality, signal level.

[0446] In a possible implementation, the serving cell of the terminal device is a geostationary satellite cell; the processing module 12 is further configured to:

[0447] Measure the low-earth orbit satellite cell corresponding to the geostationary satellite cell where the terminal device is located to obtain the measurement result of the low-earth orbit satellite cell;

[0448] Perform cell reselection according to the measurement result of the low-earth orbit satellite cell.

[0449] In a possible implementation, the serving cell of the terminal device is a geostationary satellite cell; the processing module 12 is further configured to:

[0450] When the service of the terminal device is a preset service, measure the low-earth orbit satellite cell corresponding to the geostationary satellite cell where the terminal device is located to obtain the measurement result of the low-earth orbit satellite cell;

[0451] Perform cell reselection according to the measurement result of the low-earth orbit satellite cell.

[0452] In a possible implementation, the preset service includes at least one of the following:

[0453] A low-latency service, where the data transmission latency of the low-latency service is less than or equal to a preset duration;

[0454] A high-rate service, where the data transmission rate of the high-rate service is greater than or equal to a preset rate.

[0455] In a possible implementation, the processing module 12 is further specifically configured to:

[0456] When the measurement result of the low-earth orbit satellite cell is greater than the third threshold, reselect to the low-earth orbit satellite cell;

[0457] Wherein, the measurement result includes at least one of the following: signal quality, signal level.

[0458] In a possible implementation, the processing module 12 is further specifically configured to:

[0459] Obtain the location of the terminal device and the ephemeris data of the low-earth orbit satellite corresponding to the low-earth orbit satellite cell;

[0460] Determine the distance between the terminal device and the low-earth orbit satellite according to the location of the terminal device and the ephemeris data;

[0461] Determine the remaining coverage duration of the terminal device in the low-earth orbit satellite cell according to the distance between the terminal device and the low-earth orbit satellite;

[0462] In the case where the remaining coverage duration is greater than the duration threshold, perform cell reselection according to the measurement result of the low-earth orbit satellite cell and the remaining coverage duration.

[0463] In a possible implementation manner, the processing module 12 is further specifically configured to:

[0464] Measure the geostationary satellite cell to obtain the measurement result of the geostationary satellite cell;

[0465] Perform cell reselection according to the measurement result of the low-earth orbit satellite cell and the measurement result of the geostationary satellite cell.

[0466] In a possible implementation manner, the processing module 12 is further specifically configured to:

[0467] In the case where the measurement result of the geostationary satellite cell is less than the second threshold and the measurement result of the low-earth orbit satellite cell is greater than the third threshold, reselect to the low-earth orbit satellite cell;

[0468] Wherein, the measurement result includes at least one of the following: signal quality, signal level.

[0469] In a possible implementation manner, in the case of lack of terrestrial network coverage, after the application layer of the terminal device receives a user-triggered operation request, the application layer sends a query request to the access layer of the terminal device, and the query request is used to query the cell status information corresponding to the terminal device;

[0470] The access layer sends the cell status information to the application layer;

[0471] The application layer determines whether to trigger cell reselection between multi-orbit satellite cells according to the cell status information and the service of the terminal device.

[0472] In a possible implementation manner, the application layer sends a first instruction to the access layer, and the first instruction is used to indicate whether the access layer performs cell reselection between multi-orbit satellite cells;

[0473] In the case where the first instruction indicates to perform cell reselection between multi-orbit satellite cells, the access layer sends a satellite cell reselection result to the application layer;

[0474] The application layer sends a second instruction to the access layer according to the satellite cell reselection result, where the second instruction is used to indicate whether the access layer performs satellite cell access operations;

[0475] When the second instruction indicates to perform satellite cell access operations, the access layer sends a satellite cell access result to the application layer;

[0476] After determining that the satellite cell access is successful according to the satellite cell access result, the application layer executes the operation request triggered by the user.

[0477] In a possible implementation manner, when the application layer fails to execute the operation request triggered by the user, the application layer re-triggers cell reselection between multi-track satellite cells; and / or, the application layer generates a prompt message for indicating that the operation request fails to be executed.

[0478] In a possible implementation manner, the network device is a satellite base station.

[0479] In a possible implementation manner, the terminal device includes at least one of the following:

[0480] A terminal device in an idle state;

[0481] A terminal device in a non-active state.

[0482] The cell reselection device provided in the embodiments of the present application can execute the technical solutions executed by the terminal device shown in the above method embodiments. The implementation principles and beneficial effects are similar and will not be elaborated here.

[0483] Figure 11 This is the second structural schematic diagram of the cell reselection device provided in the embodiments of the present application. Please refer to Figure 11 , the cell reselection device 20 can be applied to the network device in the above embodiments. The cell reselection device 20 may include:

[0484] A transceiver module 21, configured to send cell reselection parameters to a terminal device. The cell reselection parameters include at least one of the following parameters for multi-track satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-track satellite cell reselection, a first threshold for triggering cell reselection of a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection of a low-orbit satellite cell. The cell reselection parameters are used for the terminal device to perform cell reselection between multi-track satellite cells.

[0485] In a possible implementation, the cell reselection parameter is included in the system message; or, the cell reselection parameter is included in the signaling.

[0486] In a possible implementation, the network device is a satellite base station.

[0487] In a possible implementation, the terminal device includes at least one of the following:

[0488] A terminal device in the idle state;

[0489] A terminal device in the inactive state.

[0490] The cell reselection device provided by the embodiments of the present application can execute the technical solutions executed by the network device shown in the above method embodiments. The implementation principles and beneficial effects are similar and will not be elaborated here.

[0491] Figure 12 It is a schematic structural diagram of a communication device provided by the embodiments of the present application. This communication device can be, for example, the terminal device 101 or the network device 102 in the above text. Please refer to Figure 12 , this communication device 30 includes a transceiver 31, a memory 32, and a processor 33. The transceiver 31 may include at least one of the following: a transmitter, a receiver. The transmitter may also be referred to as a sender, a transmitter, a sending port, or a sending interface, etc. Similar descriptions apply to the receiver, which may also be referred to as a receiver, a receiver, a receiving port, or a receiving interface, etc. The number of processors can be at least one. Exemplarily, the transceiver 31, the memory 32, and the processor 33 are interconnected with each other through a bus 34.

[0492] The memory 32 is used to store program instructions;

[0493] The processor 33 is used to execute the program instructions stored in the memory, so that the communication device 30 executes the cell reselection method shown in any of the above.

[0494] The transceiver 31 is used to execute the transceiver function of the communication device 30 in the above cell reselection method.

[0495] The communication device provided by the embodiments of the present application can execute the technical solutions shown in the above method embodiments. The implementation principles and beneficial effects are similar and will not be elaborated here.

[0496] The embodiments of the present application provide a non-transitory computer-readable storage medium storing computer instructions, and the computer instructions are used to cause a computer to execute the above method.

[0497] The embodiments of the present application may also provide a computer program product, including a computer program, which when executed by a processor, can implement the above method.

[0498] All or part of the steps of the above method embodiments can be completed by hardware related to program instructions. The foregoing program can be stored in a readable memory. When the program is executed, it performs the steps including the above method embodiments; and the foregoing memory (storage medium) includes: read-only memory (ROM), random access memory (Random Access Memory, RAM), flash memory, hard disk, solid state drive, magnetic tape, floppy disk, optical disc, and any combination thereof.

[0499] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, and the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processing unit of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable devices to generate a machine, so that the instructions executed by the processing unit of the computer or other programmable devices generate a machine for implementing the processes Figure 1 one process or multiple processes and / or blocks Figure 1 a device for performing the functions specified in one block or multiple blocks.

[0500] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable device to work in a specific manner, so that the instructions stored in the computer-readable memory generate a manufactured article including an instruction device, and the instruction device implements the processes Figure 1 one process or multiple processes and / or blocks Figure 1 a device for performing the functions specified in one block or multiple blocks.

[0501] These computer program instructions can also be loaded onto a computer or other programmable device, so that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the processes Figure 1 one process or multiple processes and / or blocks Figure 1 a device for performing the functions specified in one block or multiple blocks.

[0502] Obviously, those skilled in the art can make various changes and modifications to the embodiments of the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the embodiments of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

[0503] In this application, terms such as "first" and "second" are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. In this application, "a plurality of" means two or more. "And / or" describes the relationship between related objects and indicates that there can be three relationships. For example, A and / or B can represent three cases: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the related objects before and after.

Claims

1. A cell reselection method, characterized in that, Applied to a terminal device, the method includes: Receiving cell reselection parameters sent by a network device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a list of candidate cells for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a geostationary satellite cell, a second threshold for triggering cell reselection from a geostationary satellite cell to a low-earth orbit satellite cell, and a third threshold for triggering cell reselection to a low-earth orbit satellite cell; Performing cell reselection between multi-orbit satellite cells according to the cell reselection parameters.

2. The method according to claim 1, wherein: The cell reselection parameters are included in a system message; or, The cell reselection parameters are included in a signaling.

3. The method according to claim 1 or 2, characterized in that, The cell reselection parameters include a priority parameter; performing cell reselection between multi-orbit satellite cells according to the cell reselection parameters includes: Performing cell reselection between the multi-orbit satellite cells according to the priority parameter; wherein the priority parameter is used to indicate the reselection priority of the multi-orbit satellite cells, and the multi-orbit satellite cells at least include at least one of the following: a geostationary satellite cell, a low-earth orbit satellite cell.

4. The method according to claim 1 or 2, characterized in that, The cell reselection parameters include a type indication parameter; performing cell reselection between multi-orbit satellite cells according to the cell reselection parameters includes: Performing cell reselection between the multi-orbit satellite cells according to the type indication parameter; wherein the type indication parameter is used to indicate the satellite type corresponding to the serving cell of the terminal device, and the satellite type at least includes one of the following: a geostationary satellite, a low-earth orbit satellite.

5. The method according to claim 1 or 2, characterized in that, The serving cell of the terminal device is a low-earth orbit satellite cell, and the cell reselection parameters include a priority parameter; Performing cell reselection between multi-orbit satellite cells according to the cell reselection parameters includes: Measuring the geostationary satellite cell corresponding to the low-earth orbit satellite cell where the terminal device is located to obtain a measurement result of the geostationary satellite cell when the priority parameter indicates that the reselection priority of the geostationary satellite cell is higher than that of the low-earth orbit satellite cell; Performing cell reselection according to the measurement result of the geostationary satellite cell.

6. The method according to claim 5, wherein Performing cell reselection according to the measurement result of the geostationary satellite cell includes: Reselecting to the geostationary satellite cell when the measurement result of the geostationary satellite cell is greater than the first threshold; wherein the measurement result includes at least one of the following: signal quality, signal level.

7. The method according to claim 1, wherein The serving cell of the terminal device is a geostationary satellite cell; the method further includes: Measuring the low-earth orbit satellite cell corresponding to the geostationary satellite cell where the terminal device is located to obtain a measurement result of the low-earth orbit satellite cell; Performing cell reselection according to the measurement result of the low-earth orbit satellite cell.

8. The method according to claim 1, characterized in that, The serving cell of the terminal device is a geostationary satellite cell; the method further includes: Measuring the low-earth orbit satellite cell corresponding to the geostationary satellite cell where the terminal device is located to obtain a measurement result of the low-earth orbit satellite cell when the service of the terminal device is a preset service; Perform cell reselection according to the measurement results of the low-earth orbit satellite cell.

9. The method according to claim 8, wherein The preset services include at least one of the following: Low-latency services, where the data transmission latency of the low-latency services is less than or equal to a preset duration; High-rate services, where the data transmission rate of the high-rate services is greater than or equal to a preset rate.

10. The method according to claim 7 or 8, characterized in that, Performing cell reselection according to the measurement results of the low-earth orbit satellite cell includes: When the measurement results of the low-earth orbit satellite cell are greater than the third threshold, reselect to the low-earth orbit satellite cell; Wherein, the measurement results include at least one of the following: signal quality, signal level.

11. The method according to claim 7 or 8, characterized in that Performing cell reselection according to the measurement results of the low-earth orbit satellite cell includes: Obtain the location of the terminal device and the ephemeris data of the low-earth orbit satellite corresponding to the low-earth orbit satellite cell; Determine the distance between the terminal device and the low-earth orbit satellite according to the location of the terminal device and the ephemeris data; Determine the remaining coverage duration of the terminal device in the low-earth orbit satellite cell according to the distance between the terminal device and the low-earth orbit satellite; When the remaining coverage duration is greater than the duration threshold, perform cell reselection according to the measurement results of the low-earth orbit satellite cell and the remaining coverage duration.

12. The method according to claim 7 or 8, characterized in that, Performing cell reselection according to the measurement results of the low-earth orbit satellite cell includes: Measure the geostationary satellite cell to obtain the measurement results of the geostationary satellite cell; Perform cell reselection according to the measurement results of the low-earth orbit satellite cell and the measurement results of the geostationary satellite cell.

13. The method according to claim 12, wherein Performing cell reselection according to the measurement results of the low-earth orbit satellite cell and the measurement results of the geostationary satellite cell includes: When the measurement results of the geostationary satellite cell are less than the second threshold and the measurement results of the low-earth orbit satellite cell are greater than the third threshold, reselect to the low-earth orbit satellite cell; Wherein, the measurement results include at least one of the following: signal quality, signal level.

14. The method according to claim 1 or 2, characterized in that, In the case of lack of terrestrial network coverage, the method further includes: After the application layer of the terminal device receives a user-triggered operation request, the application layer sends a query request to the access layer of the terminal device, and the query request is used to query the cell status information corresponding to the terminal device; The access layer sends the cell status information to the application layer; The application layer determines whether to trigger cell reselection between multi-orbit satellite cells according to the cell status information and the services of the terminal device.

15. The method according to claim 14, wherein The method further includes: The application layer sends a first instruction to the access layer, and the first instruction is used to indicate whether the access layer performs cell reselection between multi-orbit satellite cells; When the first instruction indicates to perform cell reselection between multi-orbit satellite cells, the access layer sends a satellite cell reselection result to the application layer; The application layer sends a second instruction to the access layer according to the satellite cell reselection result, and the second instruction is used to indicate whether the access layer performs satellite cell access operation; When the second instruction indicates to perform satellite cell access operation, the access layer sends a satellite cell access result to the application layer; After determining that the satellite cell access is successful according to the satellite cell access result, the application layer executes the operation request triggered by the user.

16. The method according to claim 15, characterized in that, In the case where the application layer fails to execute the operation request triggered by the user, the method further includes at least one of the following: The application layer re-triggers cell reselection between multi-orbit satellite cells; The application layer generates a prompt message for indicating that the execution of the operation request fails.

17. The method according to claim 1 or 2, characterized in that The network device is a satellite base station.

18. The method according to claim 1 or 2, characterized in that, The terminal device includes at least one of the following: An idle terminal device; A non-active terminal device.

19. A cell reselection method, characterized in that, Applied to a network device, the method includes: Sending cell reselection parameters to a terminal device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection to a low-orbit satellite cell, and the cell reselection parameters are used for the terminal device to perform cell reselection between multi-orbit satellite cells.

20. The method according to claim 19, wherein The network device is a satellite base station.

21. The method according to claim 19 or 20, characterized in that, The terminal device includes at least one of the following: An idle terminal device; A non-active terminal device.

22. A cell reselection device, characterized in that, Applied to a terminal device, the apparatus includes: A transceiver module, configured to receive cell reselection parameters sent by a network device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection to a low-orbit satellite cell; A processing module, configured to perform cell reselection between multi-orbit satellite cells according to the cell reselection parameters.

23. A cell reselection device, characterized in that, Applied to a network device, the apparatus includes: A transceiver module, configured to send cell reselection parameters to a terminal device, where the cell reselection parameters include at least one of the following parameters for multi-orbit satellite cell reselection: a priority parameter, a type indication parameter, a candidate cell list for multi-orbit satellite cell reselection, a first threshold for triggering cell reselection to a high-orbit satellite cell, a second threshold for triggering cell reselection from a high-orbit satellite cell to a low-orbit satellite cell, and a third threshold for triggering cell reselection to a low-orbit satellite cell, and the cell reselection parameters are used for the terminal device to perform cell reselection between multi-orbit satellite cells.

24. A terminal device, characterized in that, Includes: At least one processor; And A memory communicatively connected to the at least one processor; wherein, The memory stores instructions executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the method according to any one of claims 1 to 18.

25. A network device, characterized in that, Includes: At least one processor; And A memory communicatively connected to the at least one processor; wherein, The memory stores instructions that are executed by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to execute the method according to any one of claims 19 to 21.

26. A non-transitory computer-readable storage medium storing computer instructions, characterized in that, Wherein, the computer instructions are used to cause a computer to execute the method according to any one of claims 1 to 18, or any one of claims 19 to 21.

27. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method according to any one of claims 1 to 18, or any one of claims 19 to 21.

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