Communication methods, terminal devices and network devices

Abstract

A communication method, a terminal device, and a network device are provided. The method includes a step in which the terminal device performs a first operation based on a first time, where the first time is a time when a satellite corresponding to a first cell of the terminal device is changed, and the first operation includes one or more of a second operation performed by the terminal device after the terminal device starts using ephemeris information of the changed satellite and a third operation performed by the terminal device in response to the change of the satellite of the first cell. The terminal device can respond to the change of satellite by performing the first operation. For example, if the first operation includes the second operation, the terminal device can determine the time from which to start using ephemeris information of the changed satellite based on the time when the satellite is changed, thereby making the use of ephemeris information more consistent with actual conditions. For example, if the first operation includes the third operation, the terminal device can avoid communication abnormalities due to the change of satellite as much as possible by performing the third operation.

Description

[Technical Field]

[0001] The present application relates to the field of communication technologies, and more particularly to methods, terminal equipment and network equipment for communication. [Background technology]

[0002] With the development of technology, non-terrestrial network (NTN) communications will emerge from time to time. NTN communications can be implemented based on satellites or other non-terrestrial communications devices. Therefore, in some embodiments, NTN communications may be referred to as satellite communications. Because satellites are mobile, the satellite serving a terminal device can change even if the terminal device is not moving. In some cases, the related art does not propose how a terminal device can respond to a change in satellite. Summary of the Invention [Problem to be solved by the invention]

[0003] The present application provides a communication method, a terminal device, and a network device. Hereinafter, each aspect of the present application will be described. [Means for solving the problem]

[0004] In a first aspect, a method for communication is provided, comprising a step of a terminal device performing a first operation based on a first time, the first time being a time of change of a satellite corresponding to a first cell of the terminal device, the first operation including one or more of: a second operation performed by the terminal device after the terminal device starts using ephemeris information of the changed satellite; and a third operation performed by the terminal device in response to the change of the satellite of the first cell.

[0005] In a second aspect, a method for communication is provided, comprising: a step in which a network device determines a first time, the first time being a change time of a satellite corresponding to a first cell of the terminal device; and a step in which the network device configures, based on the first time, one or more of ephemeris information of the changed satellite and a first operation to be performed by the terminal device based on the first time, wherein the first operation includes one or more of a second operation to be performed by the terminal device after the terminal device starts using the ephemeris information of the changed satellite and a third operation to be performed by the terminal device in response to the change of the satellite of the first cell.

[0006] In a third aspect, there is provided a terminal device including an execution unit for executing a first operation based on a first time, the first time being a time of change of a satellite corresponding to a first cell of the terminal device, and the first operation including one or more of a second operation that is executed after the terminal device starts using ephemeris information of the changed satellite, and a third operation that is executed by the terminal device in response to the change of the satellite of the first cell.

[0007] In a fourth aspect, there is provided a network device including: a determining unit for determining a first time, the first time being a change time of a satellite corresponding to a first cell of the terminal device; and a configuring unit for configuring, based on the first time, one or more of: ephemeris information of the changed satellite; and a first operation, in which the terminal device performs a first operation based on the first time, wherein the first operation includes one or more of: a second operation, in which the terminal device starts to use the ephemeris information of the changed satellite; and a third operation, in which the terminal device performs in response to the change of the satellite of the first cell.

[0008] In a fifth aspect, there is provided a terminal device including a memory and a processor, the memory being adapted to store one or more computer programs, and the processor being adapted to call the computer programs in the memory and cause the terminal device to perform some or all of the steps of the method of the first aspect.

[0009] In a sixth aspect, there is provided a network device including a memory and a processor, wherein the memory is used to store one or more computer programs, and the processor invokes the computer programs in the memory to cause the network device to perform some or all of the steps in the method of the second aspect.

[0010] In a seventh aspect, the present invention provides a communication system including the above terminal device and / or network device. In another possible design, the system may further include other devices that interact with the terminal device or network device in the solution according to the present invention.

[0011] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium storing a computer program that causes a terminal device and / or a network device to execute some or all of the steps of the methods of the above aspects.

[0012] In a ninth aspect, embodiments of the present application provide a computer program product including a non-transitory computer-readable storage medium having stored thereon a computer program operable to cause a terminal device and / or a network device to perform some or all of the steps of the method of each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0013] In a tenth aspect, an embodiment of the present application provides a chip including a memory and a processor, the processor being capable of calling and executing a computer program from the memory, thereby implementing some or all of the steps described in the methods of the above aspects.

[0014] According to the present application, the terminal device can respond to a satellite change by performing a first operation. For example, if the first operation includes an operation (i.e., a second operation) to be performed after the terminal device starts using the ephemeris information of the changed satellite, the terminal device can determine the time to start using the ephemeris information of the changed satellite based on the time of the satellite change, thereby making the use of the ephemeris information more consistent with actual conditions. For example, if the first operation includes an operation (i.e., a third operation) to be performed by the terminal device in response to the satellite change, the terminal device can avoid communication abnormalities due to the satellite change as much as possible by performing the third operation. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic diagram of a wireless communication system applied to one embodiment of the present application; [Figure 2A] Schematic diagram of NTN communication in bent pipe mode. [Figure 2B] FIG. 1 is a schematic diagram of NTN communication in playback mode. [Figure 3A] FIG. 1 is a schematic diagram of a moving cell. [Figure 3B] FIG. 1 is a schematic diagram of a fixed cell. [Figure 4] FIG. 10 is a schematic diagram of a satellite change process where the PCI is not changed. [Figure 5] 1 is a schematic diagram of determining satellite positions at a given time via ephemeris information; [Figure 6] 1 is a schematic diagram of a network device providing new ephemeris information before the current ephemeris information expires; [Figure 7] FIG. 10 is a schematic diagram showing the effective times of ephemeris information corresponding to satellites after the change. [Figure 8] 1 is a schematic flowchart of a method for communication according to an embodiment of the present application; [Figure 9] FIG. 10 is a schematic diagram that implicitly indicates whether the first ephemeris information is associated with a new satellite. [Figure 10]FIG. 2 is a schematic diagram of an ephemeris information list according to an embodiment of the present application. [Figure 11] FIG. 10 illustrates an example of subframe boundary jitter according to an embodiment of the present application. [Figure 12] FIG. 10 illustrates an example of an RLM process based on a second counter and a first timer. [Figure 13] FIG. 2 is a schematic structural diagram of a terminal device according to an embodiment of the present application; [Figure 14] FIG. 1 is a schematic structural diagram of a network device according to an embodiment of the present application; [Figure 15] 1 is a schematic structural diagram of a device for communication according to an embodiment of the present application; DETAILED DESCRIPTION OF THE INVENTION

[0016] The following describes the technical solution of the present application with reference to the drawings.

[0017] communication systems

[0018] 1 illustrates a wireless communication system 100 according to an embodiment of the present application. The wireless communication system 100 may include a communication device. The communication device may include a network device 110 and a terminal device 120. The network device 110 may be a device that communicates with the terminal device 120.

[0019] FIG. 1 exemplarily illustrates one network device and two terminals, and optionally, the wireless communication system 100 may include multiple network devices, and the coverage area of ​​each network device may include other numbers of terminal devices, and the embodiments of the present application are not limited thereto.

[0020] Optionally, the wireless communication system 100 may further include other network entities, such as a network controller and a mobile management entity, although the embodiments of the present application are not limited thereto.

[0021] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as a 5th generation (5G) system or new radio (NR), a long term evolution (LTE) system, an LTE frequency division duplex (FDD) system, an LTE time division duplex (TDD) system, etc. The technical solutions of the present application can also be applied to future communication systems, such as a 6th generation mobile communication system and a satellite communication system.

[0022] In the present application, a terminal device may be referred to as a user equipment (UE), an access terminal, a user unit, a user station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a terminal device, a terminal, a wireless communication device, a user agent, or a user equipment. In the present application, a terminal device may refer to a device that provides voice and / or data connectivity to a user, and can be used to connect humans, objects, and machines, such as a handheld device or a vehicle-mounted device with wireless connectivity. In some embodiments, the terminal device may be a mobile phone, a tablet PC (Pad), a laptop, a palmtop computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc. Alternatively, the UE may function as a base station. For example, the UE may function as a scheduling entity and provide sidelink signals between UEs in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, a cellular phone and a car communicate with each other using sidelink signals. Communication between cellular phones and smart home devices occurs without the need for base stations to relay communication signals.

[0023] The network equipment in the embodiment of the present application may be equipment for communicating with terminal equipment. The network equipment may include access network equipment. The access network equipment provides communication coverage in a specific geographical area and can communicate with terminal equipment 120 located within the coverage area. The access network equipment may also be referred to as radio access network equipment, base station, etc. The access network equipment in the embodiment of the present application may be a radio access network (RAN) node (or equipment) that allows terminal equipment to access a wireless network. The access network equipment may broadly cover or be replaced with various names such as a Node B (NodeB), evolved base station (eNB), next generation base station (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master base station (MeNB), secondary base station (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, radio node, access point (AP), transmission node, transceiver node, base band unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), and positioning node. The base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. The base station may also refer to a communication module, modem, or chip installed in the aforementioned equipment or device.The base station may also be a mobile switching center and a device that performs the function of a base station in D2D, V2X, or machine-to-machine (M2M) communications, a network side device in a 6G network, or a device that performs the function of a base station in a future communication system. The base station may support networks of the same or different access technologies. The embodiments of the present application do not limit the specific technologies and the specific device forms adopted by the access network equipment.

[0024] The base station may be fixed or mobile. For example, a helicopter or a drone may be configured as a mobile base station, and one or more cells may move depending on the location of the mobile base station. In another example, a helicopter or a drone may be configured as a device for communicating with another base station.

[0025] The communication equipment of the wireless communication system may include not only access network equipment and terminal equipment but also core network elements. The core network elements can be realized by equipment, that is, the core network elements are core network equipment. It should be understood that the core network equipment may also be network equipment.

[0026] In the embodiments of the present application, the core network element may include a network element that processes and forwards user signaling and data. For example, the core network device may include a core access and mobility management function (AMF), a session management function (SMF), a user plane gateway, a location management function (LMF), etc. The user plane gateway may be a server that has functions such as mobility management, routing, and forwarding for user plane data, and is generally located on the network side, such as a serving gateway (SGW), a packet data network gateway (PGW), or a user plane network element functional entity (UPF). Of course, the core network may include other network elements, which will not be listed here.

[0027] In some deployments, the network equipment in the embodiments of the present application may refer to a CU or a DU, or may include a CU and a DU. The gNB may further include an AAU.

[0028] The network device and the terminal device may be configured indoors or outdoors, on land, including handheld or vehicle-mounted, on water, or in the air, such as on an airplane, balloon, or satellite. The embodiments of the present application do not limit the scenario in which the network device and the terminal device are located.

[0029] It should be understood that all or part of the functionality of the communication device in this application may be realized by software functions executed on hardware, or by virtualization functions instantiated on a platform (e.g., a cloud platform).

[0030] Non-terrestrial network (NTN)

[0031] In conventional technology, base stations in cellular communication networks can be built at relatively high locations on the ground, such as rooftops or mountaintops, to cover a wider area. The radius of the base station coverage range may range from several hundred meters to 100 kilometers. The coverage range may depend on the frequency band. For example, the coverage range of a base station in a low frequency band (e.g., 700 MHz) may be relatively large. The coverage range of a base station in a high frequency band (24 GHz) may be relatively small. Urban areas or suburban areas have relatively high population densities. By using such terrestrial base stations, the coverage range of each base station may include a larger number of terminal devices. Therefore, the coverage of such terrestrial base stations is very efficient in urban areas and suburban areas. However, to achieve coverage, operators must build base stations every certain distance (e.g., 100 kilometers) even in rural areas with low population densities. Therefore, using such terrestrial base stations to cover rural areas suffers from problems of inefficiency and high costs. Furthermore, with the development of cellular communication networks and advances in technologies such as the Internet of Things, the need for coverage in seldom-visited areas is becoming increasingly acute. For example, cellular communication networks are needed to monitor the operation status of oil pipelines in deserted areas and provide communication support for ocean-going cargo ships. However, the above-mentioned terrestrial base stations cannot support such scenarios.

[0032] In response to the above problem, NTN communications have emerged. NTN communications can be implemented based on satellites or other non-terrestrial communications devices. Therefore, in some embodiments, NTN communications may be referred to as satellite communications.

[0033] Depending on the configuration location of the wireless network equipment, NTN communication may be divided into two modes: bent-pipe mode and regenerative mode.

[0034] Figure 2A is a schematic diagram of NTN communications in bent-pipe mode. As shown in Figure 2A, in bent-pipe mode, base stations are configured on the ground, and satellites can act as a repeater. For downlink communications, downlink signals sent from base stations are transmitted to satellites via gateways (GWs). The downlink signals are then transmitted to terminal equipment on the ground via special repeaters called satellites. For uplink communications, uplink signals sent from terminal equipment are transmitted to terrestrial gateways via special repeaters called satellites, and then transmitted to base stations. The core network gateway allows base stations to transmit uplink signals to external networks.

[0035] Figure 2B is a schematic diagram of NTN communications in regenerative mode. As shown in Figure 2B, in regenerative mode, a base station is configured on the satellite. Core network elements communicate with the base station on the satellite via a gateway. Terminal devices communicate directly with the base station on the satellite.

[0036] Unlike terrestrial communication systems, satellites can be constantly moving along a predetermined orbit, in which case the terrestrial coverage of the cells corresponding to the satellites can be either moving or fixed. Depending on whether the cells are moving or not, the basic modes that the cells corresponding to the satellites have can include moving cells or fixed cells.

[0037] For a mobile cell, as the satellite moves, the cell coverage also moves on the ground. Figure 3A is a schematic diagram of a mobile cell. As shown in Figure 3A, when the satellite is at position 1, the cell coverage range is range 1, and when the satellite is at position 2, the cell coverage range is range 2. When the satellite moves from position 1 to position 2, the coverage range of the cell corresponding to the satellite changes from range 1 to range 2. As shown in Figure 3A, range 1 and range 2 have different corresponding coverages. When the cell mode is a mobile cell, the implementation of the satellite is relatively simple. The tilt angle of the satellite antenna to the ground may be changed. However, the implementation of the terminal equipment is relatively complicated.

[0038] For fixed cells, the cell coverage does not move with the movement of the satellite. That is, the cell coverage range hardly changes with the movement of the satellite. Figure 3B is a schematic diagram of a fixed cell. When the satellite is at position 1, the cell coverage range is range 1, and when the satellite is at position 2, the cell coverage range is range 2. As shown in Figure 3B, the coverage corresponding to range 1 and range 2 are almost the same. When the cell mode is fixed cell, the implementation of the satellite is relatively complicated. The satellite needs to adjust the tilt angle of its antenna to the ground according to the physical position of the satellite. However, the implementation of the terminal equipment is relatively simple.

[0039] The satellite division method and the cell division method are relatively independent. In other words, the two division methods can be combined arbitrarily. For example, there are four possible combinations: bent-pipe mode + moving cell, bent-pipe mode + fixed cell, regenerative mode + moving cell, and regenerative mode + fixed cell.

[0040] Satellite change

[0041] Because satellites can move, the satellite serving a terminal can change even if the terminal is not moving. Taking the combination of bent-pipe mode and fixed cell as an example, some communication protocols (e.g., 3GPP protocols) adopt a solution in which the physical cell ID (PCI) remains unchanged. For the terminal, as the original satellite leaves and a new satellite joins, the base station cannot be changed, and all configurations adopted by the cell (including the PCI) can be changed. In such a solution, it is equivalent to replacing only one repeater, and changing the repeater does not involve any changes to the protocol stack. Based on this, this process can be called a kind of switching, but it is not a switching in the strict sense.

[0042] FIG. 4 is a schematic diagram of a satellite change process in which the PCI is not changed. Before the satellite change time on the time axis, the terminal equipment (represented by UE in FIG. 4) is connected to a first satellite, and the PCI of the cell corresponding to the first satellite is the first PCI. After the satellite change time, the base station switches the satellite to a second satellite, and the terminal equipment begins transmitting data via the second satellite. The PCI of the cell corresponding to the second satellite does not change and remains the first PCI. Although the satellite has been changed, all the configuration of the base station does not change, so all the radio configuration parameters of the terminal equipment do not need to be changed.

[0043] Ephemeris information

[0044] In the prior art, NTN cells can notify terminal devices of satellite-related location information via ephemeris information. The terminal devices can estimate the current position of the satellites based on the ephemeris information. The ephemeris information can be transmitted via system information broadcast (SIB) 19.

[0045] In some embodiments, the ephemeris information may include one or more of a reference time, a modification parameter, and a validity period. As shown in FIG. 5 , the ephemeris information acquired by the terminal device includes a reference time T1, a validity period (T2-T1) of the ephemeris information, and a modification parameter. Based on this information, the terminal device can calculate the satellite position at any time within the period from T1 to T2. For example, for time T3, the terminal device can determine the satellite position at time T3 based on the satellite position at time T1, the length of the period from time T3 to reference time T1 (T3-T1), and the modification parameter.

[0046] The network device can provide the terminal device with ephemeris information before the reference time, and can provide the terminal device with ephemeris information after the reference time. Furthermore, the network device can provide the terminal device with updated ephemeris information before the current ephemeris information expires.

[0047] FIG. 6 is a schematic diagram illustrating how a network device provides new ephemeris information before the current ephemeris information expires. For ease of distinction, the ephemeris information before the update is referred to as the original ephemeris information, and the updated ephemeris information is referred to as the new ephemeris information. As shown in FIG. 6, the original ephemeris information expires at time T2. Before time T2, the network device can provide new ephemeris information to the terminal device. The reference time for the new ephemeris information is T1'. Therefore, during the period from T1' to T2, the terminal device can use two pieces of ephemeris information. When the terminal device calculates the physical position of a satellite using the ephemeris information, the physical positions of the same satellite calculated using these two pieces of ephemeris information are not necessarily the same, but they can be considered valid and equivalent within a certain accuracy range. Therefore, the terminal device can arbitrarily select one piece of ephemeris information.

[0048] The related art has not yet proposed how a terminal device should respond to a satellite change. For example, a difference occurs in the wireless signal quality measured by the terminal device before and after a satellite change, and the related art has not proposed how to respond to this difference. Also, the related art has not proposed how a terminal device should use ephemeris information when a satellite is changed. Below, the problem to be solved by the present application will be analyzed using the example of using ephemeris information after a satellite change.

[0049] The effective time of the ephemeris information of the satellite after the change (hereinafter referred to as the new satellite) can be in one of three cases as shown in Figure 7. All three of these cases have many problems.

[0050] Case 1: The effective time of the new satellite ephemeris is earlier than the satellite change time.

[0051] In Case 1, the terminal device may have two valid ephemeris information sets within a certain period of time. For example, this certain period refers to the period during which the validity time of the ephemeris for a new satellite has passed but the satellite has not yet been changed. Since no satellite change occurs during this period, the terminal device should use the ephemeris information for the satellite before the change (hereinafter referred to as the original satellite). However, according to related technology, the terminal device can arbitrarily select and use one piece of ephemeris information. In the case of the solution for "no PCI change," if the radio configuration of the cell is not changed during the satellite change process, the radio parameters of the terminal device cannot be changed either. However, there is a large difference between the ephemeris information sets for the two satellites. Therefore, arbitrarily selecting one piece of ephemeris information may result in the terminal device already using the ephemeris information for the new satellite even though the satellite has not yet been changed. In other words, the terminal device may use ephemeris information that does not correspond to the current satellite, resulting in communication abnormalities.

[0052] Case 2: The effective time of the new satellite ephemeris is equal to the satellite change time.

[0053] In Case 2, the terminal device can immediately use the new ephemeris information after the satellite change time. However, this solution imposes significant constraints on the provision of ephemeris information. For example, the network side must forcibly synchronize the effective time of the new satellite ephemeris with the satellite change time, otherwise the solution cannot be implemented. However, synchronizing the effective time of the new satellite ephemeris with the satellite change time makes the implementation of the network device complex.

[0054] Case 3: The effective time of the new ephemeris is later than the satellite change time.

[0055] In Case 3, after the satellite change time, the terminal device can use the ephemeris information only after the effective time of the ephemeris information of the new satellite. In other words, in Case 3, there is no ephemeris information that the terminal device can use during the period from the satellite change time to the effective time of the new ephemeris information.

[0056] 8 is a schematic flowchart of a communication method according to an embodiment of the present application, which is used to solve the above problem. The method shown in FIG. 8 may be performed by a terminal device. The method shown in FIG. 8 may include step S810.

[0057] Step S810: the terminal device performs a first operation based on a first time.

[0058] The first time may be a satellite change time corresponding to the first cell of the terminal device. Before the first time, the satellite corresponding to the first cell is the satellite before the change (i.e., the original satellite). After the first time, the satellite corresponding to the first cell is the satellite after the change (i.e., the new satellite). Before and after the satellite change, the PCI of the first cell may not be changed. The first cell may be the serving cell (also called the main cell) of the terminal device.

[0059] The first operation may include a second operation and / or a third operation. The second operation may be an operation that the terminal device performs after starting to use ephemeris information of a new satellite. The third operation may be an operation that the terminal device performs in response to a change in satellite.

[0060] When the terminal device performs the second operation based on the first time, the terminal device can determine, based on the satellite change time, the time from which the terminal device starts using the ephemeris information of the new satellite to perform the second operation. That is, the terminal device can determine that the use time of the ephemeris information of the new satellite and the effective time of the ephemeris information of the new satellite do not need to coincide. Therefore, according to the present application, the use of the ephemeris information can be more in line with actual conditions, and the above-mentioned problem caused by the start time of use of the ephemeris information of the new satellite being related only to the effective time can be avoided. For example, in Case 1 shown in FIG. 7, the terminal device can determine, based on the first time, how to use the ephemeris information of the new satellite, thereby avoiding the use of the ephemeris information of the new satellite without performing a satellite change.

[0061] Before the satellite change time, the network device can provide the terminal device with ephemeris information of the new satellite. The effective time of the ephemeris information of the new satellite may be earlier than the satellite change time. In this case, the terminal device can start using the new ephemeris information as soon as possible based on the first time (e.g., start using the new ephemeris information from the first time), thereby avoiding a situation where the terminal device does not have available ephemeris information after the satellite change. For example, in Case 2 or Case 3 shown in FIG. 7, the ephemeris information of the new satellite may be transmitted in advance before the first time, so that the ephemeris information of the new satellite becomes effective earlier than the first time (i.e., improving Case 1). At the first time, the terminal device can start using the ephemeris information of the new satellite. On the one hand, this solution can avoid the time synchronization requirement in Case 2, thereby simplifying the implementation of the communication process. On the other hand, the terminal device can use the ephemeris information of the new satellite as soon as possible after the satellite change time, thereby reducing the length of communication interruption time.

[0062] The first operation may be an operation that any terminal device needs to perform based on the ephemeris information. For example, the first operation may include one or more of calculating a satellite position, calculating a time to transmit an uplink signal to a satellite, transmitting an uplink signal, and calculating a timing advance (TA). The uplink signal may include, for example, a random access preamble. That is, the first operation may further include random access. The terminal device performing the first operation using the ephemeris information may be understood as the terminal device using the ephemeris information or the terminal device being able to perform the first operation based on the ephemeris information.

[0063] In response to the satellite change, the terminal device may perform a third operation. The third operation may be an operation related to ephemeris information. It should be understood that the third operation may be beneficial to both the satellite change and / or communications after the satellite change. For example, performing the third operation may enable a smooth satellite change. Alternatively, the third operation may prevent communications abnormalities after the satellite change.

[0064] The second and third operations are described below. The time at which the terminal device starts to perform the second operation based on the ephemeris information of the new satellite may be the use time. In some embodiments, the use time may be equal to the first time. In other words, the terminal device can start using the ephemeris information of the new satellite at the satellite change time. That is, before the satellite change time, the terminal device does not use the ephemeris information of the new satellite, and after the satellite change time, the terminal device uses the ephemeris information of the new satellite. It can be understood that in this way, a situation where the ephemeris information of the new satellite is used before the satellite change can be avoided.

[0065] In some embodiments, the time at which the terminal device stops using the ephemeris information of the original satellite may be equal to the first time. In other words, before the satellite change time, the terminal device uses the ephemeris information of the original satellite. After the satellite change time, the terminal device does not use the ephemeris information of the original satellite. In this case, even if the validity period of the ephemeris information of the original satellite does not time out, the terminal device may not use the ephemeris information of the original satellite at the satellite change time, thereby avoiding erroneous use of the ephemeris information of the original satellite after changing to a new satellite.

[0066] In some embodiments, the method illustrated in Figure 8 may be performed by a network device. The method illustrated in Figure 8 may include steps S802 and S804.

[0067] In step S802, the network device determines a first time.

[0068] In step S804, the network device configures one or more of the ephemeris information of the new satellite and the first operation based on the first time. In some embodiments, the method shown in Figure 8 may further include step S805. In step S805, the network device may transmit the first ephemeris information to the terminal device.

[0069] The terminal device can determine whether the received first ephemeris information is associated with a new satellite. In some embodiments, the terminal device can determine whether the first ephemeris information is associated with a new satellite based on an instruction from the network device. Whether the first ephemeris information is associated with a new satellite can be indicated explicitly or implicitly. Different embodiments will be described below.

[0070] When explicitly indicating whether the first ephemeris information is associated with a new satellite, the network device can transmit first indication information to the terminal device, and the first indication information may be used to indicate whether the first ephemeris information is associated with a new satellite.

[0071] The present application does not limit the indication manner of the first indication information. For example, the first indication information may belong to the first ephemeris information. Alternatively, the first indication information and the first ephemeris information may be carried in different messages.

[0072] In some embodiments, the first indication information may be carried in the first bit. In other words, the first indication information may be represented by one bit. For example, the first indication information may be represented by one bit of the first ephemeris information. In a possible implementation, if the value of the first bit is 0, the first ephemeris information is not associated with a new satellite or the first ephemeris information is associated with an original satellite. If the value of the first bit is 1, the first ephemeris information is associated with a new satellite or the first ephemeris information is not associated with an original satellite. In another possible implementation, if the value of the first bit is 1, the first ephemeris information is not associated with a new satellite or the first ephemeris information is associated with an original satellite. If the value of the first bit is 0, the first ephemeris information is associated with a new satellite or the first ephemeris information is not associated with an original satellite.

[0073] In some embodiments, the first indication information may be carried in a first parameter. The first parameter may be a Boolean parameter. In other words, the first indication information may be indicated by a Boolean parameter. For example, the first parameter may be a parameter of the first ephemeris information. The value of the first parameter may be true or false. In a possible implementation, when the value of the first parameter is true, the first ephemeris information is not associated with the new satellite or the first ephemeris information is associated with the original satellite. When the value of the first parameter is false, the first ephemeris information is associated with the new satellite or the first ephemeris information is not associated with the original satellite. In another possible implementation, when the value of the first parameter is false, the first ephemeris information is not associated with the new satellite or the first ephemeris information is associated with the original satellite. When the value of the first parameter is true, the first ephemeris information is associated with the new satellite or the first ephemeris information is not associated with the original satellite.

[0074] In some embodiments, the first indication information may be selectable, i.e., the first indication information may be present or absent in the first message capable of carrying the first indication information. For example, if the terminal device does not receive the indication information at the first time, the first message may not include the first indication information, and / or if the terminal device receives substantive information at the first time, the first message may include the first indication information. Alternatively, if the terminal device receives the indication information at the first time, the terminal device may receive the first indication information, and / or if the terminal device does not receive the indication information at the first time, the terminal device may not receive the first indication information.

[0075] Note that the message carrying the indication information of the first time may be a first message or a second message different from the first message. The first message or the second message may include, for example, a broadcast message and / or a radio resource control (RRC) message. The broadcast message may be, for example, an SIB19 message. The broadcast message may be used to indicate the above information to a terminal device in an idle state or a connected state. A dedicated RRC message may be used to indicate the above information to a terminal device in a connected state.

[0076] The above describes a method for explicitly indicating whether or not the first ephemeris information is associated with a new satellite, but the following describes a method for implicitly indicating this.

[0077] In some embodiments, the effective time of the first ephemeris information may be the second time, and whether the first ephemeris information is associated with a new satellite may be determined based on the second time.

[0078] 9 is a schematic diagram that implicitly indicates whether the first ephemeris information is associated with a new satellite. As shown in FIG. 9, if the difference between the second time and the first time is less than or equal to a first time length threshold, the first ephemeris information may be associated with a new satellite, and / or if the difference between the second time and the first time is greater than the first time length threshold, the first ephemeris information may be associated with the original satellite. In this case, the second time may be earlier than the first time.

[0079] The present application does not limit the method for determining the first time length threshold. For example, the first time length threshold may be determined or indicated by one or more of a protocol specification, an RRC message, a medium access control element (MACCE), and downlink control information (DCI). Also, for example, the first time length threshold may be indicated via a broadcast message. When acquiring the first time length threshold via an RRC message, the terminal device may acquire the first time length threshold via an RRC message of a current cell (e.g., the first cell) or may acquire the first time length threshold via an RRC message of another cell. The broadcast message may include an SIB message. The RRC message may be a dedicated RRC message.

[0080] In some embodiments, the network device can instruct the satellite corresponding to the first neighboring region to be the satellite corresponding to the first cell. Since the satellite orbits are known in advance, the satellite corresponding to the neighboring cell can be the satellite corresponding to the first cell. Based on the second instruction information, the terminal device can determine the ephemeris information of the new satellite through the ephemeris information of the neighboring cell. Therefore, the network device does not need to separately notify the ephemeris information of the new satellite, thereby reducing the consumption of communication resources.

[0081] The network device may explicitly or implicitly indicate that the satellite corresponding to the first adjacent region will become the new satellite corresponding to the first cell.

[0082] Taking explicit instruction as an example, the network device can send second instruction information to the terminal device. The second instruction information can be used to instruct the terminal device to make a satellite corresponding to a first adjacent region of the terminal device a satellite corresponding to a first cell. In other words, the second instruction information can instruct the terminal device to make a satellite corresponding to the first cell a satellite corresponding to the first adjacent region at a first time.

[0083] The second indication information can be indicated by a Boolean variable, a second bit, adding a parameter, or the like.

[0084] For example, the second indication information can be indicated by a Boolean variable of "true" or "false." In a possible implementation form, if the second indication information is true, the satellite corresponding to the first adjacent region becomes the satellite corresponding to the first cell, and if the second indication information is false, the satellite corresponding to the first adjacent region does not become the satellite corresponding to the first cell. In another possible implementation form, if the second indication information is false, the satellite corresponding to the first adjacent region becomes the satellite corresponding to the first cell, and if the second indication information is true, the satellite corresponding to the first adjacent region does not become the satellite corresponding to the first cell.

[0085] Also, for example, the second instruction information may be indicated by a second bit, i.e., 1 bit. The second bit may be 0 or 1. In a possible implementation form, when the second instruction information is 0, the satellite corresponding to the first adjacent region becomes the satellite corresponding to the first cell, and when the second instruction information is 1, the satellite corresponding to the first adjacent region does not become the satellite corresponding to the first cell. In another possible implementation form, when the second instruction information is 1, the satellite corresponding to the first adjacent region becomes the satellite corresponding to the first cell, and when the second instruction information is 0, the satellite corresponding to the first adjacent region does not become the satellite corresponding to the first cell.

[0086] In some embodiments, the second indication may be carried in the ephemeris information of the satellite corresponding to the first adjacent region, and if the second indication exists in the ephemeris information of the satellite corresponding to the first adjacent region, the satellite corresponding to the first adjacent region becomes a new satellite corresponding to the first cell, and if the second indication does not exist in the ephemeris information of the satellite corresponding to the first adjacent region, the satellite corresponding to the first adjacent region does not become a new satellite corresponding to the first cell.

[0087] The ephemeris information of the main cell and the neighboring cells can be indicated by an ephemeris information list. That is, the ephemeris information list may include one or more pieces of ephemeris information. One or more pieces of ephemeris information may be associated with the main cell and / or the neighboring cells. FIG. 10 is a diagram showing an example of an ephemeris information list. The ephemeris information list shown in FIG. 10 includes the ephemeris information of the main cell and the ephemeris information of three neighboring cells. As shown in FIG. 10, explicit second indication information can be added to the ephemeris information of the first neighboring cell, so that the network device notifies the terminal device that "from the satellite change time, the ephemeris information of the first neighboring cell will become the ephemeris information of the main cell."

[0088] Taking the implicit indication as an example, the ephemeris information of the first neighboring cell may belong to an ephemeris information list. The ephemeris information list may include ephemeris information of the terminal device's serving cell and / or ephemeris information lists of one or more neighboring cells of the terminal device. The position of the ephemeris information of the first neighboring cell in the ephemeris information list may be a first position. The first position may be used to indicate whether the satellite corresponding to the first neighboring cell is the satellite corresponding to the first cell. In this manner, the network device does not need to additionally transmit indication information, thereby avoiding resource occupation caused by additionally transmitting indication information.

[0089] In some embodiments, if the first location satisfies a first condition, the satellite corresponding to the first neighboring cell becomes the satellite corresponding to the first cell (i.e., the new satellite). For example, the first condition may include the first location being the location where the first neighboring cell is located. That is, if the ephemeris information corresponding to the first neighboring cell is the ephemeris information of the first neighboring cell in the list, the ephemeris information corresponding to the first neighboring cell becomes the ephemeris information of the new satellite. Alternatively, the first condition may include the first location being the Nth location in the ephemeris information list of one or more neighboring cells, that is, the first location is the location where the Nth neighboring cell is located. That is, if the ephemeris information corresponding to the first neighboring cell is the ephemeris information of the Nth neighboring cell in the list, the ephemeris information corresponding to the first neighboring cell becomes the ephemeris information of the new satellite. N may be a positive integer. N may be specified by a protocol or configured by a network device. Taking the ephemeris information shown in Figure 10 as an example, when N = 1, the adjacent cell is the satellite corresponding to the first cell. When N = 2, the second adjacent cell is the satellite corresponding to the first cell. When N = 3, the third adjacent cell is the satellite corresponding to the first cell.

[0090] The transmission delay time between the new satellite and the original satellite may be different. Therefore, for the terminal device, jitter may occur at the subframe boundary (e.g., downlink subframe boundary). That is, for the terminal device, the boundaries of the same corresponding frame numbers and / or subframe numbers between the new satellite and the original satellite may not match. This application proposes that the fourth time associated with the ephemeris information of the new satellite may be determined based on the subframe boundary before the satellite change or the subframe boundary after the satellite change. Based on this, this application clarifies the subframe boundary, thereby solving the problem of the unclear fourth time due to the satellite change.

[0091] The network device can use the boundary indication information to indicate that the basis for determining the fourth time point is a subframe boundary of the new satellite or a subframe boundary of the original satellite. The boundary indication information may be carried in one or more of an RRC message, a DCI, and a MAC CE. The boundary indication information may be configured in a Boolean format, a binary symbol (1 bit), or an enumeration variable.

[0092] The fourth time may include one or more of an expiration time of the ephemeris information of the new satellite and an effective time of the ephemeris information of the new satellite.

[0093] For ease of understanding, the determination of the fourth time will be explained using FIG. 11 . In the example shown in FIG. 11 , a terminal device receives ephemeris information from a new satellite. The effective time of the ephemeris information from the new satellite is "frame number 583, subframe number 4," and the ephemeris information validity period is 10.24 seconds. When the terminal device uses the ephemeris information, it can calculate the timing advance amount TA for the uplink transmission time using subframe number 4 of frame number 583 corresponding to the original satellite as the effective time. On the other hand, if the calculation is performed with an ephemeris validity period of 10.24 seconds, the ephemeris information will expire when frame number 583 and subframe number 4 are reached after the system frame number (SFN) cycle ends. However, because the physical locations of the two satellites are different, subframe boundary jitter occurs from the terminal device's perspective. If 10.24 seconds are added to the start time of the ephemeris information based on the subframe boundary when the satellite corresponding to the first cell is the original satellite, the resulting expiration time of the ephemeris information is shown by the solid gray line in Figure 11. However, if "frame number 583, subframe number 4" is set as the effective time of the ephemeris information based on the subframe boundary when the satellite corresponding to the first cell is a new satellite, the expiration time of the ephemeris information should also be "frame number 583, subframe number 4," i.e., the time shown by the dashed gray line in Figure 11. If the expiration times obtained by the two calculation methods are different, the protocol may specify that the terminal device sets the expiration time of the ephemeris information to the solid gray line, or may specify that the terminal device sets the expiration time of the ephemeris information to the dashed gray line, or the time to set the expiration time of the ephemeris information may be configured by the network device.

[0094] The third operation will be explained below.

[0095] The third operation may be associated with one or more of a power headroom report (PHR), a TA, a power adjustment value, a random access, a K offset, and a radio link monitoring (RLM).

[0096] The execution time of the third operation may be associated with the first time. For example, the execution time of the third operation may be the first time or may be later than the first time. That is, the terminal device may execute the third operation during or after a satellite change. Alternatively, the execution time of the third operation may be earlier than the first time. That is, the terminal device may execute the third operation in advance before a satellite change.

[0097] In some implementations, the third operation includes, when the terminal device triggers the first PHR before the first time, canceling the triggering of the first PHR, triggering a second PHR, triggering a TA report, resetting a power adjustment value to zero, and resetting a timing advance timer. the first counter associated with the random access resource, if the terminal device starts the random access before the first time and continues the random access after the first time, resetting the first counter associated with the random access to zero and incrementing or not changing the first counter; if the terminal device starts the random access before the first time and continues the random access after the first time, performing downlink synchronization if the downlink is not synchronized; and / or reselecting a random access resource based on the signal quality of the changed satellite, using a K offset configured by the changed satellite or a K offset with a value of 0, resetting a second counter associated with the RLM resource to zero, and stopping the first timer associated with the RLM resource. Each of the above information will be described below.

[0098] In some embodiments, if the terminal device triggers the first PHR before the first time, the third operation may include canceling the triggering of the first PHR. That is, if the terminal device has already triggered a PHR before the satellite change time, the terminal device may cancel the triggering of the existing PHR. Note that the canceling of the triggering of the first PHR may occur at or after the first time.

[0099] The reason for the PHR trigger is that the path loss change value exceeds a threshold compared to the path loss when the PHR was last sent. However, after a satellite change, the path loss value is unrelated to the original path loss. In such a case, the path loss that would have triggered the PHR is of no use to the network equipment. Therefore, the trigger of the first PHR can be canceled, reducing unnecessary communication flows and simplifying communication steps.

[0100] In some embodiments, the third operation may include triggering a second PHR in response to a satellite change, for example, the terminal device may re-trigger the PHR at or after the satellite change time.

[0101] After the satellite change, the path loss measurement of the terminal equipment is equivalent to restarting, so triggering the second PHR after the satellite change provides a path loss measurement reference that is valuable for the scheduling algorithm of the network equipment.

[0102] In some embodiments, the third operation may include triggering a TA report, for example, at or after a satellite change time, the terminal device may trigger a TA report.

[0103] The change of satellite causes the original TA value of the terminal device to become invalid, and the original TA value has no reference value for the scheduling of the network device. Therefore, the TA value reported by the terminal device in this application has reference value for the scheduling algorithm of the network device.

[0104] It should be noted that the TA triggered in the third operation can be reported via any uplink resource, and this application is not limited thereto. For example, the resources for reporting the TA may include one or more of the uplink resources acquired by the terminal device through random access and the uplink resources acquired by the terminal device through other manners. The uplink resources acquired through other manners may include, for example, resources allocated to the terminal device by the network device through dynamic scheduling or semi-static scheduling.

[0105] In some embodiments, the third operation may include resetting a power adjustment value to zero. For example, at or after a satellite change time, the terminal device may reset a power adjustment value to zero. The power adjustment value may be recorded by the terminal device and may be related to the transmit power of the terminal device.

[0106] The power adjustment value may be an accumulated value. For example, the network device can adjust the power of the terminal device in an accumulation mode. That is, the terminal device can determine the uplink transmission power based on the measured path loss and the power adjustment value accumulated and stored by the terminal device. In a possible implementation, the power adjustment value may be associated with, for example, a transmit power control (TPC). For example, the network device can always send a TPC to the terminal device, thereby notifying the terminal device to adjust the stored power adjustment value. In this case, the power adjustment value may include an accumulated TPC value.

[0107] When the satellite is changed, the power adjustment value originally stored by the terminal equipment is no longer valid. The technical solution proposed in this application for resetting the power adjustment value to zero can realize accurate recording of the power adjustment value after the satellite is changed, so that the terminal equipment can determine the uplink transmission power suitable for the new satellite.

[0108] In some embodiments, the third operation may include some or all of the operations that the terminal equipment needs to perform after a timing advance timer (TAT) times out. That is, a satellite change may correspond to a TAT timeout to some extent. In this case, the third operation may include, for example, clearing a hybrid automatic repeat request (HARQ) buffer and / or acquiring uplink synchronization via random access.

[0109] When the terminal device starts random access before the first time and needs to continue random access after the first time, the third operation may be associated with a first counter. The first counter may be a counter related to random access. For example, the first counter may include a counter for calculating the number of random accesses and / or a counter for calculating ramping of random access power. That is, the first counter is used to calculate the number of random accesses and / or ramping of random access power.

[0110] For the first counter, the third operation may include resetting the first counter to zero, incrementing the first counter by one count unit, or leaving the first counter unchanged. That is, in the first random access after changing the satellite, the first counter may start counting from 0 and increment by one count unit, or leave the first counter unchanged. The count unit may be one or more smallest count units that the counter can count.

[0111] If the first counter includes multiple counters, the third operation corresponding to the multiple counters may be different or the same. For example, if the first counter includes a counter for calculating the number of random accesses and a counter for calculating the ramping of random access power, in the first random access after changing the satellite, the first counter can count using any of Modes 1 to 3 shown in Table 1.

[0112] [Table 1]

[0113] As shown in Table 1, when using mode 1, the terminal equipment resets all counters to zero and starts counting again from 0. When using mode 2, the terminal equipment increments the counter for calculating the total number of random accesses by 1 and can also increment the counter for calculating the ramping of random access power by 1. When using mode 3, the terminal equipment increments the counter for calculating the total number of random accesses by 1 and does not change the counter for calculating the ramping of random access power.

[0114] In some embodiments, if the terminal device initiates random access before the first time and the terminal device continues random access after the first time, the third operation may include performing downlink synchronization if the downlink is not synchronized, and / or reselecting random access resources based on changed satellite signal quality.

[0115] If the terminal device performs random access before the satellite change time and continues random access after the satellite change, the terminal device needs to ensure downlink synchronization before the first random access after the satellite change. At this time, if downlink synchronization is not achieved, this application suggests that the terminal device should first perform downlink synchronization and then perform random access.

[0116] If the terminal device performs random access before the satellite change time and the random access resource selected by the terminal device is associated with signal quality, at or after the satellite change time, the terminal device can reselect a random access resource based on the signal after the satellite change to continue the random access. The signal quality may include, for example, reference signal received power (RSRP). Taking a coverage enhancement scenario as an example, different RSRP values ​​correspond to different random access resource pools, or different RSRPs can be supplemented corresponding to supplementary uplink (SUL) carriers or normal carriers.

[0117] It should be noted that continuing the random access described in this application may also refer to the medium access control (MAC) layer of the terminal device continuing the random access, which can be continued regardless of RRC, i.e., without being triggered again by RRC.

[0118] In some embodiments, the third operation may include an operation of indicating, after the first time or at the first time, that the terminal device can use a K offset configured for the changed satellite, and that the terminal device uses a K offset with a value of 0.

[0119] In one possible implementation, at the satellite change time, before the satellite change time, or after the satellite change time, the MAC layer inside the terminal device instructs the physical (PHY) layer that the K offset is 0. At the satellite change time or after the satellite change time, the terminal device can use the K offset value of 0. In another possible implementation, before the satellite change time, the terminal device receives a new K offset value instructed by the network device. At the same time, the network device can instruct that "the new K offset value can only be used at the satellite change time or after the satellite change." Furthermore, the MAC layer of the terminal device instructs the new K offset to the PHY layer. At the satellite change time or after the satellite change, the terminal device can use the K offset configured by the network device for the new satellite.

[0120] In some embodiments, if the terminal device receives a K offset indicated by the network device, the terminal device may begin using the K offset after a first time. If the terminal device does not receive a K offset indicated by a network identifier, it may use a K offset with a value of 0.

[0121] In some embodiments, both the second counter and the first timer may be associated with the RLM, and the third operation may include resetting the second counter to zero and / or stopping the first timer.

[0122] The second counter may include, for example, a counter for counting the number of times a single measurement result of the wireless signal is equal to or greater than the first threshold and / or a counter for counting the number of times a single measurement result of the wireless signal is less than the second threshold. A statistical value of the counter for counting the number of times a single measurement result of the wireless signal is equal to or greater than the first threshold can be used for comparison with N310, and a statistical value of the counter for counting the number of times a single measurement result of the wireless signal is less than the second threshold can be used for comparison with N311.

[0123] The first timer may be a timer for determining radio link failure (RLF). For example, the first timer may include a T310 timer.

[0124] To facilitate understanding of the second counter and the first timer, the following description will be given by way of example with reference to FIG.

[0125] As shown in FIG. 12, in the RLM process, the RRC of the terminal device continuously receives radio signal quality indications sent from the PHY layer and determines whether a radio link failure has occurred in the current serving cell based on the indications. The radio signal quality indications may include a first indication and a second indication. The first indication may include, for example, an in-sync indication, and the second indication may include, for example, an out-of-sync indication. The first indication may indicate that a single measurement result of the radio signal is equal to or greater than a first threshold. The second indication may indicate that a single measurement result of the radio signal is less than a second threshold. If the number of consecutive times that the RRC receives the second indication exceeds N310, the timer T310 may be started. If the number of consecutive times that the RRC receives the first indication exceeds N311 during the execution of T310, the radio link signal quality is considered normal and T310 is stopped. If the number of consecutive times that the RRC receives the first indication does not exceed N311, the timer T310 continues to be executed. If T310 times out, it may be considered a radio link failure.

[0126] 12, the second counter may be used to count the number of consecutively received second instructions to determine whether it is greater than N310, and / or may be used to count the number of consecutively received first instructions to determine whether it is greater than N311. The first timer may include T310.

[0127] Since there is no correlation between the radio signal quality before and after the satellite change, resetting the second counter to zero and / or stopping the first timer can prevent the original satellite from affecting the RLM process, thereby making the RLM process more accurate.

[0128] Whether the terminal device performs the third operation may be determined by a protocol and / or a configuration of the network device. Continuing to refer to FIG. 8, step S804 may include the network device configuring the third operation based on the first time.

[0129] In some embodiments, whether to perform the third operation may be set by the network device. The network device may indicate whether to perform the third operation via the first configuration information. The present application does not limit the transmission time or reception time of the first configuration information. For example, the transmission and reception times may be earlier, later, or equal to the first time. The transmission time and / or reception time may be specified by a protocol. Furthermore, the present application does not limit the message carrying the first configuration information. For example, the first configuration information may be carried in one or more of an RRC message, a MAC CE, a DCI, etc.

[0130] In some embodiments, the first configuration information includes the following operations performed by the terminal device: canceling the triggering of the first PHR if the terminal device triggers a first PHR before a first time; triggering a second PHR; triggering a TA report; resetting a power adjustment value to zero; some or all of the operations performed by the terminal device after a TAT timeout; clearing a HARQ buffer; obtaining uplink synchronization by random access; and resetting a first counter related to random access to zero if the terminal device starts random access before the first time and continues random access after the first time. and incrementing or not changing one count unit, and when the terminal device starts random access before the first time and continues random access after the first time, performing downlink synchronization if downlink synchronization is not achieved, and / or reselecting a random access resource based on the signal quality of the changed satellite, using a K offset configured by the changed satellite or a K offset with a value of 0, resetting a second counter associated with RLM to zero, and stopping a first timer associated with RLM. The above information will be described individually below.

[0131] In some embodiments, the network device may indicate the first time to the terminal device, for example, the network device may send third indication information to the terminal device, and the third indication information may be used to indicate the first time.

[0132] In some embodiments, the first time instant may be represented by a time unit indicator and / or absolute time.

[0133] The time unit may include one or more of a radio frame, a subframe, a time slot, and an orthogonal frequency division multiplexing (OFDM) symbol. The identifier of the time unit may be, for example, a time unit number, ID, etc. That is, the first time may be represented by one or more of a radio frame number, a subframe number, a time slot number, and an OFDM symbol. In some implementations, the first time may be a time that matches the identifier of the time unit indicated by the nearest future third indication information. For example, the third indication information may indicate the first time in the format of [frame number + subframe number]. After receiving the third indication information, the terminal device can consider the time that matches the nearest future "frame number + subframe number" to be the first time.

[0134] The absolute time can be expressed as one or more of the following: year, month, day, hour, minute, second, millisecond, and microsecond. For example, the first time can be expressed as 2 June 2023, 16:58:34:304 milliseconds.

[0135] Note that the present application does not limit the message in which the third indication information is carried. For example, the third indication information may be carried in one or more of an RRC message, a MAC CE, and a DCI. Also, for example, the third indication information may be carried in a broadcast message.

[0136] The above describes the method embodiment of the present application in detail, and the following describes the device embodiment of the present application in detail. It should be understood that the description of the method embodiment corresponds to the description of the device embodiment, so that the parts not described in detail can be referred to the previous method embodiment.

[0137] 13 is a schematic structural diagram of a terminal device 1300 according to an embodiment of the present application. The terminal device 1300 includes an execution unit 1310.

[0138] The execution unit 1310 is used to execute a first operation based on a first time, where the first time is a change time of a satellite corresponding to a first cell of the terminal equipment, and the first operation includes one or more of: a second operation executed after the terminal equipment starts to use the ephemeris information of the changed satellite; and a third operation executed by the terminal equipment in response to the change of the satellite of the first cell.

[0139] In some embodiments, the terminal device performs the second operation after starting to use the time of the satellite ephemeris information after the change at the first time.

[0140] In some embodiments, the terminal device stops using the ephemeris information of the satellite before the change and performs the second operation at the first time.

[0141] In some embodiments, the terminal device is further adapted to receive the first ephemeris information and determine whether the first ephemeris information is associated with the changed satellite.

[0142] In some embodiments, the terminal device is further adapted to receive first indication information, and the first indication information is adapted to indicate whether the first ephemeris information is associated with the changed satellite.

[0143] In some embodiments, the first indication information may be carried in the first message, and if the terminal device does not receive the indication information at the first time, the first message does not include the first indication information.

[0144] In some embodiments, the effective time of the first ephemeris information is the second time, and whether the first ephemeris information is associated with the changed satellite is determined based on the second time.

[0145] In some embodiments, the first ephemeris information is associated with the changed satellite if the difference between the second time and the first time is less than or equal to a first time length threshold, or the first ephemeris information is associated with the changed satellite if the second time is later than or equal to the first time.

[0146] In some embodiments, the terminal equipment is further used to receive second instruction information, and the second instruction information is used to instruct the satellite corresponding to the first neighboring cell of the terminal equipment to become the satellite corresponding to the first cell.

[0147] In some embodiments, the position of the ephemeris information of the first neighboring cell in the ephemeris information list is a first position, and whether the satellite corresponding to the first neighboring cell of the terminal device is the satellite corresponding to the first cell is determined by the first position.

[0148] In some embodiments, if the first location is Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell is the satellite corresponding to the first cell, where N is a positive integer.

[0149] In some embodiments, the fourth time corresponding to the ephemeris information of the satellite after the change is determined based on a subframe boundary before the satellite change or a subframe boundary after the satellite change.

[0150] In some embodiments, the fourth time includes an expiration time of the changed satellite ephemeris information and / or an effective time of the changed satellite ephemeris information.

[0151] In some embodiments, the third operation is associated with one or more of a power headroom report PHR, a timing advance TA, a power adjustment value, a random access, a K offset, and a radio link monitoring RLM.

[0152] In some embodiments, the third operation includes canceling the triggering of the first PHR if the terminal device triggers the first PHR before the first time, triggering a second PHR, triggering a TA report, resetting a power adjustment value to zero, some or all of the operations performed by the terminal device after a timing advance timer TAT times out, clearing a hybrid automatic repeat request (HARQ) buffer, and obtaining uplink synchronization by random access if the terminal device starts random access before the first time and continues random access after the first time. The method includes one or more of: resetting an associated first counter to zero and incrementing one count unit or not changing it; performing downlink synchronization if the downlink is not synchronized when the terminal device starts random access before the first time and the terminal device continues random access after the first time; and / or reselecting a random access resource based on the signal quality of the changed satellite; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting a second counter associated with the RLM to zero; and stopping a first timer associated with the RLM.

[0153] In some embodiments, the terminal device is further used to receive first configuration information, and the first configuration information is used to configure whether the terminal device performs the third operation.

[0154] In some embodiments, the first configuration information includes, when the terminal device triggers a first PHR before the first time, canceling the triggering of the first PHR, triggering a second PHR, triggering a TA report, resetting a power adjustment value to zero, some or all of the operations performed by the terminal device after a timing advance timer TAT times out, clearing a hybrid automatic repeat request (HARQ) buffer, and obtaining uplink synchronization by random access, and, when the terminal device starts random access before the first time and continues random access after the first time, a second PHR related to the random access. It is used to configure whether to perform one or more of: resetting one counter to zero and incrementing one count unit or not changing it; performing downlink synchronization if the downlink is not synchronized when the terminal device starts random access before the first time and continues random access after the first time; reselecting a random access resource based on the signal quality of the changed satellite; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting a second counter related to the RLM to zero; and stopping a first timer related to the RLM.

[0155] In some embodiments, the execution time of the third operation is later than or equal to the first time.

[0156] In some embodiments, the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

[0157] 14 is a schematic structural diagram of a network device 1400 according to an embodiment of the present application. The network device 1400 may include: a determining unit 1410 and a configuring unit 1420.

[0158] The determining unit 1410 is used to determine a first time, where the first time is a change time of the satellite corresponding to the first cell of the terminal equipment.

[0159] The configuration unit 1420 is used to configure, based on a first time, one or more of the ephemeris information of the changed satellite and a first operation to be performed by the terminal device based on the first time, wherein the first operation includes one or more of a second operation to be performed after the terminal device starts to use the ephemeris information of the changed satellite and a third operation to be performed by the terminal device in response to the change of the satellite of the first cell.

[0160] In some embodiments, the network device is further adapted to transmit the first ephemeris information and transmit the first instruction information, where the first instruction information is adapted to indicate whether the first ephemeris information is associated with the changed satellite.

[0161] In some embodiments, the first indication information may be carried in the first message, and if the terminal device does not receive the indication information at the first time, the first message does not include the first indication information.

[0162] In some embodiments, the network device is further used to transmit first ephemeris information, the effective time of the first ephemeris information is a second time, and whether the first ephemeris information is associated with the changed satellite is determined based on the second time.

[0163] In some embodiments, the first ephemeris information is associated with the changed satellite if the difference between the second time and the first time is less than or equal to a first time length threshold, or the first ephemeris information is associated with the changed satellite if the second time is later than or equal to the first time.

[0164] In some embodiments, the network device is further used to send second instruction information, and the second instruction information is used to instruct the satellite corresponding to the first neighboring cell of the terminal device to become the satellite corresponding to the first cell.

[0165] In some embodiments, the position of the ephemeris information of the first neighboring cell in the ephemeris information list is a first position, and whether the satellite corresponding to the first neighboring cell of the terminal device is the satellite corresponding to the first cell is determined by the first position.

[0166] In some embodiments, if the first location is Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell is the satellite corresponding to the first cell, where N is a positive integer.

[0167] In some embodiments, the network device is further used to send first configuration information, and the first configuration information is used to configure whether the terminal device performs the third operation.

[0168] In some embodiments, the first configuration information includes, when the terminal device triggers a first PHR before the first time, canceling the triggering of the first PHR, triggering a second PHR, triggering a TA report, resetting a power adjustment value to zero, some or all of the operations performed by the terminal device after a timing advance timer TAT times out, clearing a hybrid automatic repeat request (HARQ) buffer, and obtaining uplink synchronization by random access, and, when the terminal device starts random access before the first time and continues random access after the first time, a second PHR related to the random access. It is used to configure whether to perform one or more of: resetting one counter to zero and incrementing one count unit or not changing it; performing downlink synchronization if the downlink is not synchronized when the terminal device starts random access before the first time and continues random access after the first time; reselecting a random access resource based on the signal quality of the changed satellite; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting a second counter related to the RLM to zero; and stopping a first timer related to the RLM.

[0169] In some embodiments, the execution time of the third operation is later than or equal to the first time.

[0170] In some embodiments, the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

[0171] In an alternative embodiment, the execution unit 1310, the determination unit 1410, and the configuration unit 1420 may be a processor 1510. The terminal device 1300 or the network device 1400 may further include a memory 1520 and / or a transceiver 1530, as specifically shown in FIG.

[0172] Figure 15 is a schematic structural diagram of a communication device according to an embodiment of the present application. The dashed lines in Figure 15 indicate that the unit or module is optional. The device 1500 may be used to implement the method described in the above method embodiment. The device 1500 may be a chip, a terminal device, or a network device.

[0173] The device 1500 may include one or more processors 1510. The processor 1510 can support the device 1500 in implementing the methods described in the method embodiments above. The processor 1510 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or the like. A general-purpose processor may be a microprocessor, or the processor may be any conventional processor, or the like.

[0174] The device 1500 may further include one or more memories 1520. The memories 1520 may store programs that may be executed by the processor 1510 to cause the processor 1510 to perform the methods described in the method embodiments above. The memory 1520 may be separate from the processor 1510 or may be integrated into the processor 1510.

[0175] The apparatus 1500 may further include a transceiver 1530. The processor 1510 may communicate with other devices or chips via the transceiver 1530. For example, the processor 1510 may transmit and receive data to and from other devices or chips via the transceiver 1530.

[0176] An embodiment of the present application further provides a computer-readable storage medium for storing a program, which can be applied to a terminal or a network device according to the embodiment of the present application, and the program can cause a computer to execute the method performed by the terminal or the network device according to each embodiment of the present application.

[0177] An embodiment of the present application further provides a computer program product, which includes a program that can be applied to a terminal or a network device according to an embodiment of the present application, and causes a computer to execute a method performed by the terminal or the network device according to each embodiment of the present application.

[0178] The embodiments of the present application further provide a computer program, which is applicable to the terminal or network device according to the embodiments of the present application, and causes a computer to execute the method executed by the terminal or network device according to each embodiment of the present application.

[0179] It should be understood that in this application, the terms "system" and "network" may be interchangeable. Furthermore, the terms used in this application are used only to interpret specific embodiments of the application and are not intended to limit the application. The terms "first," "second," "third," "fourth," etc. in the specification, claims, and drawings of this application are used to distinguish between different objects, not to describe a particular order. Furthermore, the terms "include," "have," and any variations thereof are intended to cover a non-exclusive inclusion.

[0180] In the embodiments of the present application, the "indication" referred to may be a direct indication or an indirect indication, and may indicate an association relationship. For example, when A indicates B, it may mean that A directly indicates B, e.g., that B can be obtained by A, or that A indirectly indicates B, e.g., that A indicates C, e.g., that B can be obtained by C, and it may indicate an association relationship between A and B.

[0181] In the embodiments of the present application, "B corresponding to A" indicates that B is associated with A and B can be determined depending on A. However, determining B depending on A does not mean determining B depending on A only, and B may be determined depending on A and / or other information.

[0182] In the embodiments of the present application, the term "correspondence" may indicate a direct or indirect correspondence relationship between the two, or an association relationship between the two, such as a relationship of indicating and indicated, or a relationship of configuring and configured.

[0183] In the embodiments of the present application, "predefined" or "preconfigured" may be realized by pre-storing corresponding code, form, or a format capable of instructing related information in a device (including, for example, a user device and a network device), and the present application does not limit the specific implementation form. For example, predefined may refer to being defined in a protocol.

[0184] In the embodiments of the present application, the "protocol" may refer to a standard protocol in the communication field, and may include, for example, an LTE protocol, an NR protocol, and related protocols applied to future communication systems, but the present application is not limited thereto.

[0185] In the examples of the present application, the term "and / or" simply describes the relationship between related objects and indicates that three types of relationships exist, for example, A and / or B includes three situations: only A exists, both A and B exist, and only B exists. In addition, in this specification, the symbol " / " generally indicates that the related objects before and after it have an "or" relationship.

[0186] In the embodiments of the present application, the term "comprises" may mean directly or indirectly including. Optionally, the term "comprises" in the embodiments of the present application can be replaced with "indicates" or "used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0187] In various embodiments of the present application, the order of the numbers of the above processes does not indicate the order of execution, and the execution order of each process should be determined based on its function and inherent logic, and does not constitute any limitation on the implementation process of the embodiments of the present application.

[0188] It should be understood that in some embodiments of the present application, the disclosed systems, devices, and methods can be implemented in other forms. For example, the device embodiments described above are merely exemplary, and the division of the units is merely one type of logical function division. In actual implementation, other division schemes may be adopted, for example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. Furthermore, the shown or discussed mutual couplings or direct couplings or communication connections may be indirect couplings or communication connections via some interfaces, devices, or units, and may be in electrical, mechanical, or other forms.

[0189] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, i.e., they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of the means of this embodiment according to actual needs.

[0190] Furthermore, each functional unit in each embodiment of the present application may be integrated into one processing unit, each unit may exist physically separately, or two or more units may be integrated into one unit.

[0191] The above embodiments may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, all or in part may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, they generate all or some of the procedures or functions described in the embodiments of the present application. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored on a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wire (e.g., coaxial cable, fiber optics, digital subscriber line (DSL)) or wireless (e.g., infrared, radio, microwave, etc.). The computer-readable storage medium may be any available medium readable by a computer, or a data storage device, such as a server or data center, that integrates one or more available media. The available media may be magnetic media (e.g., floppy disks, hard disks, tapes), optical media (e.g., digital video discs (DVDs)), or semiconductor media (e.g., solid state disks (SSDs)).

[0192] Although specific embodiments of the present application have been described above, the scope of protection of the present application is not limited thereto, and all modifications and substitutions that can be easily conceived by those skilled in the art without departing from the technical scope disclosed in the present application fall within the scope of protection of the present application, and therefore the scope of protection of the present application should conform to the scope of protection of the claims. [Explanation of symbols]

[0193] 100 Wireless Communication System 110 Network Equipment 120 Terminal Equipment 1300 Terminal Equipment 1310 Execution Unit 1400 Network Equipment 1410 Decision Unit 1420 Configuration Unit 1500 equipment 1510 processor 1520 memory 1530 Transmitter / Receiver

Claims

1. 1. A method for communication, comprising: The method includes a step of executing a first operation by a terminal device based on a first time; The first time is a change time of a satellite corresponding to a first cell of the terminal device, and the first operation is: a second operation to be performed after the terminal device starts using the ephemeris information of the changed satellite; and a third operation performed by the terminal equipment in response to a change in the satellite of the first cell.

2. 2. The method according to claim 1, wherein the terminal device performs the second operation after starting to use the time of the satellite ephemeris information after the time has been changed to the first time.

3. 3. The method according to claim 1, wherein the terminal device stops using the ephemeris information of the satellite before the change at the first time and then performs the second operation.

4. receiving first ephemeris information by the terminal device; The method according to any one of claims 1 to 3, further comprising a step of determining by the terminal device whether the first ephemeris information is associated with the changed satellite.

5. The method further includes receiving first indication information by the terminal device; 5. The method of claim 4, wherein the first indication information is used to indicate whether the first ephemeris information is associated with the changed satellite.

6. 6. The method of claim 5, wherein the first indication information can be carried in a first message, and if the terminal device does not receive the indication information at the first time, the first message does not include the first indication information.

7. 5. The method according to claim 4, wherein the effective time of the first ephemeris information is a second time, and whether or not the first ephemeris information is associated with the changed satellite is determined based on the second time.

8. If the difference between the second time and the first time is less than or equal to a first time threshold, the first ephemeris information is associated with the new satellite; or 8. The method of claim 7, wherein the first ephemeris information is associated with the changed satellite if the second time is later than or equal to the first time.

9. The method further includes receiving second indication information by the terminal device; The method according to any one of claims 1 to 8, characterized in that the second instruction information is used to instruct the satellite corresponding to the first neighboring cell of the terminal device to become the satellite corresponding to the first cell.

10. The method according to any one of claims 1 to 8, characterized in that the position of the ephemeris information of the first neighboring cell in the ephemeris information list is a first position, and whether the satellite corresponding to the first neighboring cell of the terminal device is the satellite corresponding to the first cell is determined by the first position.

11. 11. The method of claim 10, wherein if the first location is an Nth location in a list of ephemeris information of one or more neighboring cells, the satellite corresponding to the first neighboring cell becomes the satellite corresponding to the first cell, where N is a positive integer.

12. The method according to any one of claims 1 to 11, characterized in that the fourth time corresponding to the ephemeris information of the satellite after the change is determined based on a subframe boundary before the satellite change or a subframe boundary after the satellite change.

13. The method according to claim 12 , wherein the fourth time includes an expiration time of the changed satellite ephemeris information and / or an effective time of the changed satellite ephemeris information.

14. 14. The method according to any one of claims 1 to 13, characterized in that the third operation is associated with one or more of the following: a power headroom report (PHR), a timing advance (TA), a power adjustment value, a random access, a K offset, a radio link monitoring (RLM).

15. The third operation is When the terminal device triggers a first PHR before the first time, canceling the trigger of the first PHR; triggering a second PHR; triggering a TA report; resetting the power adjustment value to zero; Some or all of the operations performed by the terminal device after a timing advance timer TAT has timed out; and clearing a hybrid automatic repeat request (HARQ) buffer; Obtaining uplink synchronization by random access; If the terminal device starts random access before a first time and continues the random access after the first time, resetting a first counter related to the random access to zero, and incrementing one count unit or not changing it; When the terminal device starts random access before a first time and continues the random access after the first time, if downlink synchronization is not achieved, performing downlink synchronization and / or reselecting random access resources based on the changed satellite signal quality; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting to zero a second counter associated with the RLM; and stopping a first timer associated with the RLM.

16. The method further includes receiving first configuration information by the terminal device; The method according to any one of claims 1 to 15, wherein the first configuration information is used to configure whether the terminal device performs the third operation.

17. The first configuration information is information that the terminal device When the terminal device triggers a first PHR before the first time, canceling the trigger of the first PHR; triggering a second PHR; triggering a TA report; resetting the power adjustment value to zero; Some or all of the operations performed by the terminal device after a timing advance timer TAT has timed out; and clearing a hybrid automatic repeat request (HARQ) buffer; Obtaining uplink synchronization by random access; If the terminal device starts random access before a first time and continues the random access after the first time, resetting a first counter related to the random access to zero, and incrementing one count unit or not changing it; When the terminal device starts random access before a first time and continues the random access after the first time, if downlink synchronization is not achieved, performing downlink synchronization and / or reselecting random access resources based on a changed satellite signal quality; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting to zero a second counter associated with the RLM; and stopping a first timer associated with the RLM.

18. 18. The method according to any one of claims 1 to 17, wherein the execution time of the third operation is later than or equal to the first time.

19. 19. The method according to any one of claims 1 to 18, wherein the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

20. 1. A method for communication, comprising: a step of determining a first time by the network device, the first time being a change time of a satellite corresponding to a first cell of the terminal device; and configuring, by the network device based on the first time, one or more of: changed satellite ephemeris information; and configuring, by the terminal device based on the first time, a first operation; The first operation is a second operation to be performed after the terminal device starts using the ephemeris information of the changed satellite; and a third operation performed by the terminal equipment in response to a change in the satellite of the first cell.

21. transmitting first ephemeris information from the network device; the network device sending first instruction information; 21. The method of claim 20, wherein the first indication information is used to indicate whether the first ephemeris information is associated with the changed satellite.

22. 22. The method of claim 21, wherein the first indication information can be carried in a first message, and if the terminal device does not receive the indication information at the first time, the first message does not include the first indication information.

23. The method further includes transmitting first ephemeris information by the network device; The method according to claim 20 , wherein an effective time of the first ephemeris information is a second time, and whether or not the first ephemeris information is associated with the changed satellite is determined based on the second time.

24. If the difference between the second time and the first time is equal to or less than a first time length threshold, the first ephemeris information is associated with the changed satellite; or 24. The method of claim 23, wherein the first ephemeris information is associated with the changed satellite if the second time is later than or equal to the first time.

25. The method further includes a step of transmitting second instruction information by the network device; The method according to any one of claims 20 to 24, characterized in that the second instruction information is used to instruct the satellite corresponding to the first neighboring cell of the terminal device to become the satellite corresponding to the first cell.

26. The method according to any one of claims 20 to 24, characterized in that the position of the ephemeris information of the first neighboring cell in the ephemeris information list is a first position, and whether the satellite corresponding to the first neighboring cell of the terminal device is the satellite corresponding to the first cell is determined by the first position.

27. 27. The method of claim 26, wherein if the first location is Nth in a list of ephemeris information of one or more neighboring cells, the satellite corresponding to the first neighboring cell becomes the satellite corresponding to the first cell, where N is a positive integer.

28. The method further includes a step of transmitting first configuration information by the network device; The method according to any one of claims 20 to 27, wherein the first configuration information is used to configure whether the terminal device performs the third operation.

29. The first configuration information is information that the terminal device When the terminal device triggers a first PHR before the first time, canceling the trigger of the first PHR; triggering a second PHR; triggering a TA report; resetting the power adjustment value to zero; Some or all of the operations performed by the terminal device after a timing advance timer TAT has timed out; and clearing a hybrid automatic repeat request (HARQ) buffer; Obtaining uplink synchronization by random access; If the terminal device starts random access before a first time and continues the random access after the first time, resetting a first counter related to the random access to zero, and incrementing one count unit or not changing it; When the terminal device starts random access before a first time and continues the random access after the first time, if downlink synchronization is not achieved, performing downlink synchronization and / or reselecting random access resources based on a changed satellite signal quality; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting to zero a second counter associated with the RLM; and stopping a first timer associated with the RLM.

30. 30. The method according to any one of claims 20 to 29, wherein the execution time of the third operation is later than or equal to the first time.

31. 31. The method according to claim 20, wherein the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

32. A terminal device, an execution unit for executing a first operation based on a first time; The first time is a change time of a satellite corresponding to a first cell of the terminal device, and the first operation is: a second operation to be performed after the terminal device starts using the ephemeris information of the changed satellite; and a third operation that the terminal equipment performs in response to a change in the satellite of the first cell.

33. The terminal device according to claim 32, wherein the terminal device performs the second operation after starting to use the ephemeris information of the satellite after the change at the first time.

34. 34. The terminal device according to claim 32, wherein the terminal device stops using the ephemeris information of the satellite before the change at the first time and executes the second operation.

35. further receiving first ephemeris information; 35. The terminal device according to claim 32, wherein the first ephemeris information is used to determine whether or not the first ephemeris information is associated with the changed satellite.

36. and further configured to receive first indication information; The terminal device according to claim 35, wherein the first indication information is used to indicate whether the first ephemeris information is associated with the changed satellite.

37. 37. The terminal device of claim 36, wherein the first indication information can be carried in a first message, and if the terminal device does not receive the indication information at the first time, the first message does not include the first indication information.

38. 36. The terminal device according to claim 35, wherein the effective time of the first ephemeris information is a second time, and whether or not the first ephemeris information is associated with the changed satellite is determined based on the second time.

39. If the difference between the second time and the first time is equal to or less than a first time length threshold, the first ephemeris information is associated with the changed satellite; or 39. The terminal device according to claim 38, wherein the first ephemeris information is associated with the changed satellite when the second time is later than or equal to the first time.

40. and further configured to receive second instruction information; The terminal device according to any one of claims 32 to 39, characterized in that the second instruction information is used to instruct the satellite corresponding to the first neighboring cell of the terminal device to become the satellite corresponding to the first cell.

41. A terminal device according to any one of claims 32 to 39, characterized in that the position of the ephemeris information of the first adjacent cell in the ephemeris information list is a first position, and whether or not the satellite corresponding to the first adjacent cell of the terminal device is the satellite corresponding to the first cell is determined by the first position.

42. 42. The terminal device of claim 41, wherein if the first location is an Nth location in a list of ephemeris information of one or more neighboring cells, a satellite corresponding to the first neighboring cell becomes a satellite corresponding to the first cell, where N is a positive integer.

43. The terminal device according to any one of claims 32 to 42, characterized in that the fourth time corresponding to the ephemeris information of the satellite after the change is determined based on a subframe boundary before the satellite change or a subframe boundary after the satellite change.

44. 44. The terminal device according to claim 43, wherein the fourth time includes an expiration time of the changed satellite ephemeris information and / or an effective time of the changed satellite ephemeris information.

45. 45. The terminal device according to any one of claims 32 to 44, wherein the third operation is associated with one or more of a power headroom report (PHR), a timing advance (TA), a power adjustment value, a random access, a K offset, and a radio link monitoring (RLM).

46. The third operation is When the terminal device triggers a first PHR before the first time, canceling the trigger of the first PHR; triggering a second PHR; triggering a TA report; resetting the power adjustment value to zero; Some or all of the operations performed by the terminal device after a timing advance timer TAT has timed out; and clearing a hybrid automatic repeat request (HARQ) buffer; Obtaining uplink synchronization by random access; If the terminal device starts random access before a first time and continues the random access after the first time, resetting a first counter related to the random access to zero, and incrementing one count unit or not changing it; When the terminal device starts random access before a first time and continues the random access after the first time, if downlink synchronization is not achieved, performing downlink synchronization and / or reselecting random access resources based on the changed satellite signal quality; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting to zero a second counter associated with the RLM; and stopping a first timer associated with the RLM.

47. and further configured to receive first configuration information; The terminal device according to any one of claims 32 to 46, wherein the first configuration information is used to configure whether the terminal device performs the third operation.

48. The first configuration information is information that the terminal device When the terminal device triggers a first PHR before the first time, canceling the trigger of the first PHR; triggering a second PHR; triggering a TA report; resetting the power adjustment value to zero; Some or all of the operations performed by the terminal device after a timing advance timer TAT has timed out; and clearing a hybrid automatic repeat request (HARQ) buffer; Obtaining uplink synchronization by random access; If the terminal device starts random access before a first time and continues the random access after the first time, resetting a first counter related to the random access to zero, and incrementing one count unit or not changing it; When the terminal device starts random access before a first time and continues the random access after the first time, if downlink synchronization is not achieved, performing downlink synchronization and / or reselecting random access resources based on a changed satellite signal quality; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting to zero a second counter associated with the RLM; and stopping a first timer associated with the RLM.

49. The terminal device according to any one of claims 32 to 48, wherein the execution time of the third operation is later than or equal to the first time.

50. 50. The terminal device according to claim 32, wherein the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

51. A network device, a determining unit for determining a first time, the first time being a change time of a satellite corresponding to a first cell of the terminal equipment; a configuration unit for configuring, based on the first time, one or more of: changed satellite ephemeris information; and a first operation to be performed by a terminal device based on the first time; The first operation is a second operation to be performed after the terminal device starts using the ephemeris information of the changed satellite; and a third operation performed by the terminal equipment in response to a change in the satellite of the first cell.

52. further transmitting the first ephemeris information; and transmitting first indication information; 52. The network device of claim 51, wherein the first indication information is used to indicate whether the first ephemeris information is associated with the changed satellite.

53. 53. The network device of claim 52, wherein the first indication information can be carried in a first message, and when the terminal device does not receive the indication information at the first time, the first message does not include the first indication information.

54. and further used for transmitting the first ephemeris information; 52. The network device according to claim 51, wherein the effective time of the first ephemeris information is a second time, and whether or not the first ephemeris information is associated with the changed satellite is determined based on the second time.

55. If the difference between the second time and the first time is equal to or less than a first time length threshold, the first ephemeris information is associated with the changed satellite; or 55. The network device of claim 54, wherein the first ephemeris information is associated with the changed satellite when the second time is later than or equal to the first time.

56. and further configured to transmit second instruction information; The network device according to any one of claims 51 to 55, characterized in that the second instruction information is used to instruct the satellite corresponding to the first neighboring cell of the terminal device to become the satellite corresponding to the first cell.

57. A network device according to any one of claims 51 to 56, characterized in that the position of the ephemeris information of the first adjacent cell in the ephemeris information list is a first position, and whether or not the satellite corresponding to the first adjacent cell of the terminal device is the satellite corresponding to the first cell is determined by the first position.

58. 58. The network device of claim 57, wherein if the first location is an Nth location in a list of ephemeris information of one or more neighboring cells, a satellite corresponding to the first neighboring cell becomes a satellite corresponding to the first cell, where N is a positive integer.

59. and further configured to transmit first configuration information; The network device according to any one of claims 51 to 58, wherein the first configuration information is used to configure whether the terminal device executes the third operation.

60. The first configuration information is information that the terminal device When the terminal device triggers a first PHR before the first time, canceling the trigger of the first PHR; triggering a second PHR; triggering a TA report; resetting the power adjustment value to zero; Some or all of the operations performed by the terminal device after a timing advance timer TAT has timed out; and clearing a hybrid automatic repeat request (HARQ) buffer; Obtaining uplink synchronization by random access; If the terminal device starts random access before a first time and continues the random access after the first time, resetting a first counter related to the random access to zero, and incrementing one count unit or not changing it; When the terminal device starts random access before a first time and continues the random access after the first time, if downlink synchronization is not achieved, performing downlink synchronization and / or reselecting random access resources based on a changed satellite signal quality; using a K offset configured by the changed satellite or a K offset with a value of 0; resetting to zero a second counter associated with the RLM; and stopping a first timer associated with the RLM.

61. 61. The network device according to claim 51, wherein the execution time of the third operation is later than or equal to the first time.

62. 62. The network device according to claim 51, wherein the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

63. A terminal device comprising a memory and a processor, the memory being used to store a program, and the processor calling the program in the memory to cause the terminal device to execute the method of any one of claims 1 to 19.

64. A network device comprising a memory and a processor, wherein the memory is used to store a program, and the processor calls the program in the memory to cause the network device to execute the method according to any one of claims 20 to 31.

65. An apparatus, comprising a processor for calling a program from a memory to cause the apparatus to perform the method of any one of claims 1 to 31.

66. A chip, comprising a processor for calling a program from a memory to cause a device in which said chip is installed to carry out the method of any one of claims 1 to 31.

67. A computer-readable storage medium having stored thereon a program for causing a computer to execute the method according to any one of claims 1 to 31.

68. A computer program product, characterized in that it comprises a program that causes a computer to carry out the method according to any one of claims 1 to 31.

69. A computer program, characterized in that it causes a computer to carry out the method according to any one of claims 1 to 31.

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