Communication method, terminal device, and network device

Abstract

Provided are a communication method, a terminal device, and a network device. The method comprises: a terminal device executes a first operation on the basis of a first moment, wherein the first moment is a change moment of a satellite corresponding to a first cell of the terminal device, and the first operation comprises one or more of the following operations: a second operation that the terminal device starts to execute by using ephemeris information of the changed satellite; and a third operation executed by the terminal device in response to the change of the satellite corresponding to the first cell. The terminal device may execute the first operation to deal with a satellite change. Taking the first operation comprising the second operation as an example, the terminal device may determine, on the basis of the change moment of the satellite, the moment of starting use of the ephemeris information of the changed satellite, such that the use of the ephemeris information better conforms to the actual situation. Taking the first operation comprising the third operation as an example, the terminal device can avoid a communication abnormality, caused by a satellite change, to the extent possible by executing the third operation.

Description

Communication method, terminal device and network device Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a method, terminal equipment, and network equipment for communication. Background Art

[0002] With technological advancements, non-terrestrial network (NTN) communications have emerged. NTN communications can be implemented using satellites or other non-terrestrial communication devices. Therefore, in some embodiments, NTN communications can also be referred to as satellite communications. Because satellites are mobile, the satellite serving a terminal device can change even if the terminal device remains stationary. However, relevant technologies have not yet addressed how terminal devices can respond to satellite changes in certain situations.

[0003] Summary of the Invention

[0004] The present application provides a method, terminal device, and network device for communication. The following introduces various aspects of the present application.

[0005] In a first aspect, a method for communication is provided, which includes: a terminal device performs a first operation according to a first moment; wherein the first moment is the moment when the satellite corresponding to the first cell of the terminal device is changed, and the first operation includes one or more of the following operations: a second operation performed by the terminal device starting to use the ephemeris information of the changed satellite; a third operation performed by the terminal device in response to a change in the satellite of the first cell.

[0006] According to a second aspect, a method for communication is provided, the method comprising: a network device determines a first moment, the first moment being a moment when a satellite corresponding to a first cell of a terminal device is changed; the network device configures one or more of the following information according to the first moment: ephemeris information of the changed satellite, a first operation performed by the terminal device according to the first moment; wherein the first operation comprises one or more of the following operations: a second operation performed by the terminal device starting to use the ephemeris information of the changed satellite; a third operation performed by the terminal device in response to a change in the satellite of the first cell.

[0007] According to a third aspect, a terminal device is provided, comprising: an execution unit for executing a first operation according to a first moment; wherein the first moment is a moment when the satellite corresponding to the first cell of the terminal device is changed, and the first operation comprises one or more of the following operations: a second operation executed by the terminal device starting to use the ephemeris information of the changed satellite; a third operation executed by the terminal device in response to a change in the satellite of the first cell.

[0008] In a fourth aspect, a network device is provided, comprising: a determination unit for determining a first moment, the first moment being a moment when the satellite corresponding to the first cell of the terminal device is changed; a configuration unit for configuring one or more of the following information according to the first moment: the ephemeris information of the changed satellite, and a first operation performed by the terminal device according to the first moment; wherein the first operation includes one or more of the following operations: a second operation performed by the terminal device starting to use the ephemeris information of the changed satellite; and a third operation performed by the terminal device in response to a change in the satellite of the first cell.

[0009] In a fifth aspect, a terminal device is provided, comprising a processor and a memory, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the terminal device executes part or all of the steps in the method of the first aspect.

[0010] In a sixth aspect, a network device is provided, comprising a processor, a memory, and a transceiver, wherein the memory is used to store one or more computer programs, and the processor is used to call the computer program in the memory so that the network device executes part or all of the steps in the method of the second aspect.

[0011] In a seventh aspect, an embodiment of the present application provides a communication system, which includes the above-mentioned terminal device and / or network device. In another possible design, the system may also include other devices that interact with the terminal device or network device in the solution provided in the embodiment of the present application.

[0012] In an eighth aspect, an embodiment of the present application provides a computer-readable storage medium, which stores a computer program, and the computer program enables a terminal device and / or a network device to execute part or all of the steps in the methods of the above aspects.

[0013] In a ninth aspect, embodiments of the present application provide a computer program product, wherein the computer program product includes a non-transitory computer-readable storage medium storing a computer program, wherein the computer program is operable to cause a terminal device and / or a network device to perform some or all of the steps of the methods described in each of the above aspects. In some implementations, the computer program product may be a software installation package.

[0014] In the tenth aspect, an embodiment of the present application provides a chip, which includes a memory and a processor. The processor can call and run a computer program from the memory to implement some or all of the steps described in the methods of the above aspects.

[0015] Based on the present application, the terminal device can perform a first operation to respond to a satellite change. Taking the example of the first operation including the operation performed by the terminal device starting to use the ephemeris information of the changed satellite (i.e., the second operation), 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, so that the use of the ephemeris information is more in line with the actual situation. Taking the example of the first operation including the operation performed by the terminal device in response to the satellite change (i.e., the third operation), the terminal device can avoid communication anomalies caused by satellite changes as much as possible by performing the third operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] FIG1 is a schematic diagram of a wireless communication system used in an embodiment of the present application.

[0017] FIG2A is a schematic diagram of NTN communication in bent-pipe mode.

[0018] FIG2B is a schematic diagram of NTN communication in regeneration mode.

[0019] FIG3A is a schematic diagram of a mobile cell.

[0020] FIG3B is a schematic diagram of a fixed cell.

[0021] FIG4 is a schematic diagram of the satellite change process with unchanged PCI.

[0022] FIG5 is a schematic diagram of determining the satellite position at a certain moment through ephemeris information.

[0023] FIG6 is a schematic diagram showing that a network device provides new ephemeris information before the current ephemeris information becomes invalid.

[0024] FIG7 is a schematic diagram of the effective time of the ephemeris information corresponding to the changed satellite.

[0025] FIG8 is a schematic flowchart of a method for communication provided in an embodiment of the present application.

[0026] FIG9 is a schematic diagram of implicitly indicating whether the first ephemeris information corresponds to a new satellite.

[0027] FIG10 is a schematic diagram of an ephemeris information list provided in an embodiment of the present application.

[0028] FIG11 is an example diagram of subframe boundary jitter provided in an embodiment of the present application.

[0029] FIG. 12 is a diagram illustrating an example of an RLM process based on a second counter and a first timer.

[0030] FIG13 is a schematic structural diagram of a terminal device provided in an embodiment of the present application.

[0031] FIG14 is a schematic structural diagram of a network device provided in an embodiment of the present application.

[0032] FIG15 is a schematic structural diagram of a device for communication provided in an embodiment of the present application. DETAILED DESCRIPTION

[0033] The technical solution in this application will be described below with reference to the accompanying drawings.

[0034] Communication System

[0035] FIG1 illustrates a wireless communication system 100 used in an embodiment of the present application. The wireless communication system 100 may include communication devices. The communication devices 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.

[0036] FIG1 exemplarily shows a network device and two terminals. Optionally, the wireless communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, which is not limited in the embodiments of the present application.

[0037] Optionally, the wireless communication system 100 may further include other network entities such as a network controller and a mobility management entity, which is not limited in the embodiment of the present application.

[0038] It should be understood that the technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), etc. The technical solutions provided in this application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0039] The terminal device in the embodiments of the present application may also be referred to as user equipment (UE), access terminal, user unit, user station, mobile station, mobile station (MS), mobile terminal (MT), remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The terminal device in the embodiments of the present application may refer to a device that provides voice and / or data connectivity to a user and can be used to connect people, objects and machines, such as a handheld device with wireless connection function, a vehicle-mounted device, etc. The terminal device in the embodiments of the present application can be a mobile phone, a tablet computer, a laptop computer, a PDA, 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. Optionally, the UE can be used to act as a base station. For example, the UE can act as a scheduling entity that provides sidelink signals between UEs in vehicle-to-everything (V2X) or device-to-device (D2D). For example, a cellular phone and a car communicate with each other using sidelink signals. The cellular phone and smart home devices communicate without relaying the communication signal through a base station.

[0040] The network device in the embodiments of the present application may be a device for communicating with a terminal device. The network device may also include an access network device. The access network device may provide communication coverage for a specific geographical area and may communicate with the terminal device 120 located within the coverage area. The access network device may also be referred to as a radio access network device or a base station. The access network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects the terminal device to a wireless network. Access network equipment can broadly cover various names as follows, or replace the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master eNB (MeNB), secondary eNB (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be set in the aforementioned device or apparatus. A base station may also be a mobile switching center and a device that performs base station functions in D2D, V2X, and machine-to-machine (M2M) communications, a network-side device in a 6G network, or a device that performs base station functions in future communication systems. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by the access network device.

[0041] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0042] The communication equipment involved in a wireless communication system can include not only access network equipment and terminal equipment, but also core network elements. Core network elements can be implemented by devices, that is, core network elements are core network devices. It is understood that core network devices can also be a type of network equipment.

[0043] The core network elements in the embodiments of the present application may include network elements that process and forward user signaling and data. For example, the core network equipment may include core network access and mobility management function (AMF), session management function (SMF), user plane gateway, location management function (LMF) and other core network equipment. Among them, the user plane gateway may be a server with functions such as mobility management, routing, and forwarding of user plane data, generally located on the network side, such as a serving gateway (SGW) or a packet data network gateway (PGW) or a user plane network element function entity (UPF). Of course, the core network may also include other network elements, which are not listed here one by one.

[0044] In some deployments, the network device in the embodiments of the present application may refer to a CU or a DU, or the network device includes a CU and a DU. The gNB may also include an AAU.

[0045] The network equipment and terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; they can also be deployed in the air on aircraft, balloons, and satellites. The embodiments of this application do not limit the scenarios in which the network equipment and terminal devices are located.

[0046] It should be understood that all or part of the functions of the communication device in this application can also be implemented through software functions running on hardware, or through virtualization functions instantiated on a platform (such as a cloud platform).

[0047] Non-terrestrial network (NTN)

[0048] In related technologies, cellular communication network base stations can be built at relatively high altitudes, such as rooftops or mountaintops, to provide coverage over a wide area. The coverage radius of a base station can range from a few hundred meters to 100 kilometers. This coverage range can depend on the frequency band. For example, base stations operating in low-frequency bands (e.g., 700 MHz) can have a relatively large coverage range. Base stations operating in high-frequency bands (24 GHz) can have a relatively small coverage range. Urban and suburban areas have high population densities. Using such ground-based base stations allows for a large number of devices within the coverage area of ​​each base station. Therefore, such ground-based base stations provide very efficient coverage in urban and suburban areas. However, to achieve coverage, even in rural areas with low population density, operators must establish base stations at regular intervals (e.g., 100 kilometers). Therefore, using such ground-based base stations for rural coverage is inefficient and expensive. Furthermore, with the continuous development of cellular communication networks and advancements in technologies such as the Internet of Things, there is an increasing demand for coverage in remote areas. For example, cellular communication networks need to monitor the operation of oil pipelines in desert areas and support communications with ocean-going cargo ships at sea. However, the above-mentioned ground base stations cannot support such scenarios.

[0049] To address the above issues, NTN communications emerged. NTN communications can be implemented based on satellites or other non-terrestrial communication equipment. Therefore, in some embodiments, NTN communications can also be referred to as satellite communications.

[0050] According to the deployment location of wireless network equipment, NTN communication can be divided into two modes: bent pipe mode and regeneration mode.

[0051] Figure 2A is a schematic diagram of NTN communication in bent-pipe mode. As shown in Figure 2A, in bent-pipe mode, the base station is deployed on the ground, and the satellite can act as a repeater. For downlink communication, the downlink signal from the base station is transmitted to the satellite via a gateway (GW). The downlink signal is then transmitted to the terminal device on the ground via the satellite, a special repeater. For uplink communication, the uplink signal from the terminal is transmitted via the satellite, a special repeater, to the gateway on the ground, and then to the base station. Through the core network gateway, the base station can send the uplink signal to the external network.

[0052] Figure 2B shows a schematic diagram of NTN communication in regenerative mode. As shown in Figure 2B, in regenerative mode, the base station is deployed at the satellite. Core network elements communicate with the satellite-mounted base station via a gateway. Terminal devices communicate directly with the satellite-mounted base station.

[0053] Unlike terrestrial communication systems, satellites can move continuously along predetermined orbits. In this case, the ground coverage of the cells corresponding to the satellites can be either mobile or fixed. Depending on whether the cells are mobile, the basic modes of the cells corresponding to the satellites can include: mobile cell or fixed cell.

[0054] For mobile cells, 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 in position 1, the cell coverage range is range 1; when the satellite is in 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, the coverage conditions corresponding to range 1 and range 2 are different. When the cell mode is a mobile cell, the implementation of the satellite is relatively simple. The tilt angle of the satellite antenna toward the ground can remain unchanged. However, the implementation of the terminal equipment is relatively complex.

[0055] For fixed cells, the cell coverage does not move with the movement of the satellite. That is, as the satellite moves, the cell coverage range hardly changes. Figure 3B is a schematic diagram of a fixed cell. When the satellite is in position 1, the cell coverage range is range 1; when the satellite is in position 2, the cell coverage range is range 2. As shown in Figure 3B, the coverage conditions corresponding to range 1 and range 2 are almost the same. When the cell mode is a fixed cell, the implementation of the satellite is relatively complex. The satellite needs to adjust the antenna tilt angle toward the ground according to the physical location of the satellite. However, the implementation of the terminal device is relatively simple.

[0056] It should be noted that the satellite division method and cell division method described above are relatively independent. In other words, the two division methods can be combined in any way. For example, the following four combinations are possible: bent pipe mode + mobile cell; bent pipe mode + fixed cell; regenerative mode + mobile cell; regenerative mode + fixed cell.

[0057] Satellite changes

[0058] Since satellites can move, even if the terminal device does not move, the satellite serving the terminal device can change. Taking the bent-pipe mode + fixed cell mode as an example, some communication protocols (such as the 3GPP protocol) adopt a solution in which the physical cell ID (PCI) of the cell remains unchanged. For the terminal device, as the old satellite moves out and the new satellite moves in, the base station can remain unchanged, and all configurations used by the cell (including the PCI) can remain unchanged. In this solution, it is equivalent to simply replacing a repeater, and changing the repeater does not involve any changes to the protocol stack. Based on this, the process can be called a handover, but it cannot be considered a handover in the strict sense.

[0059] Figure 4 illustrates the satellite change process with unchanged PCI. Before the satellite change on the timeline, the terminal device (represented by the UE in Figure 4) is connected to the first satellite, and the PCI of the cell corresponding to the first satellite is the first PCI. After the satellite change, the base station switches to the second satellite, and the terminal device begins transmitting data via the second satellite. The PCI of the cell corresponding to the second satellite remains unchanged, remaining the first PCI. Although the satellite has changed, all base station configurations remain unchanged, so all wireless configuration parameters of the terminal device can remain unchanged.

[0060] Ephemeris information

[0061] In related technologies, NTN cells can notify terminal devices of satellite-related location information through ephemeris information. Based on the ephemeris information, the terminal device can infer the current location of the satellite. The ephemeris information can be transmitted via system information broadcast (SIB) 19.

[0062] In some embodiments, the ephemeris information may include one or more of the following information: a reference time, a variation parameter, and a valid time length. As shown in FIG5 , the ephemeris information obtained by the terminal device includes the reference time T1, the valid time length of the ephemeris information (T2-T1), and the variation parameter. Based on this information, the terminal device can calculate the satellite position at any time within the time period from T1 to T2. For example, at time T3, the terminal device can determine the satellite position at time T3 based on the satellite position at time T1, the time period length from time T3 to reference time T1 (T3-T1), and the variation parameter.

[0063] It is worth noting that the network device can provide the terminal device with ephemeris information before the reference time, or after the reference time. In addition, the network device can provide the terminal device with updated ephemeris information before the current ephemeris information expires.

[0064] Figure 6 is a schematic diagram of a network device providing new ephemeris information before the current ephemeris information becomes invalid. For ease of distinction, the ephemeris information before the update is referred to as the old ephemeris information, and the ephemeris information after the update is referred to as the new ephemeris information. As shown in Figure 6, the old ephemeris information becomes invalid at time T2. Before time T2, the network device can provide the terminal device with new ephemeris information. The reference time of the new ephemeris information is T1'. Therefore, during the period from T1' to T2, the terminal device has two copies of ephemeris information available. When the terminal device calculates the physical position of the satellite using the ephemeris information, although the physical positions of the same satellite calculated based on the two copies of ephemeris information may not be the same, they can be considered valid and equivalent within a certain accuracy range. Therefore, the terminal device can arbitrarily select one copy of the ephemeris information for use.

[0065] Related technologies haven't addressed how terminal devices should respond to satellite changes. For example, the wireless signal quality measured by a terminal device may differ before and after a satellite change, and related technologies haven't addressed how to address this difference. Alternatively, related technologies haven't addressed how terminal devices should use ephemeris information after a satellite change. The following uses the example of using ephemeris information after a satellite change to analyze the issues addressed by this application.

[0066] The effective time of the ephemeris information of the changed satellite (hereinafter referred to as "new satellite") may be as shown in the three cases shown in Figure 7. There are many problems in these three cases.

[0067] Case 1: The effective time of the new satellite ephemeris is earlier than the changed satellite time.

[0068] In some cases, a terminal device may have two valid ephemeris information within a period of time. For example, this period of time may be: the effective time of the new satellite's ephemeris has passed, but the satellite has not yet changed. During this period of time, since the satellite has not yet been changed, the terminal device should use the ephemeris information of the satellite before the change (hereinafter referred to as the old satellite). However, according to relevant technologies, the terminal device can arbitrarily select one ephemeris information to use. Although for the "PCI unchanged" solution, the wireless configuration of the cell will not change during the satellite change process, and the wireless parameters of the terminal device may also not change, there are significant differences in the ephemeris information of the two satellites. Therefore, arbitrarily selecting one ephemeris information may result in the terminal device using the ephemeris information of the new satellite when the satellite has not yet changed. That is, the terminal device may use ephemeris information that does not correspond to the current satellite, resulting in communication anomalies.

[0069] Case 2: The effective time of the new satellite ephemeris is equal to the changed satellite time.

[0070] In the second scenario, after the satellite time is changed, the terminal device can immediately use the new satellite's ephemeris information. However, this solution imposes significant restrictions on the provision of ephemeris information. For example, the network must forcibly align the effective time of the new satellite ephemeris with the changed satellite time; otherwise, this solution will not work. However, time alignment complicates the implementation of network equipment.

[0071] Case 3: The effective time of the new satellite ephemeris is later than the changed satellite time.

[0072] In case 3, after changing the satellite time, the terminal device must wait for the new satellite's ephemeris information to take effect before using the ephemeris information. In other words, in case 3, the terminal device has no ephemeris information to use between the time the satellite time is changed and the time the new satellite's ephemeris information takes effect.

[0073] FIG8 is a schematic flow chart of a method for communication provided by an embodiment of the present application to solve the above problem. The method shown in FIG8 can be executed by a terminal device. The method shown in FIG8 can include step S810.

[0074] Step S810: The terminal device performs a first operation according to the first moment.

[0075] The first moment may be the moment when the satellite corresponding to the first cell of the terminal device is changed. Before the first moment, the satellite corresponding to the first cell is the satellite before the change (i.e., the old satellite). After the first moment, the satellite corresponding to the first cell is the satellite after the change (i.e., the new satellite). The PCI of the first cell may remain unchanged before and after the satellite change. The first cell may be the serving cell (or current cell) of the terminal device.

[0076] The first operation may include a second operation and / or a third operation. The second operation may be an operation performed by the terminal device when it starts using the ephemeris information of the new satellite. The third operation may be an operation performed by the terminal device in response to a satellite change.

[0077] When the terminal device performs the second operation based on the first moment, the terminal device can determine the moment at which the new satellite's ephemeris information will be used to perform the second operation based on the satellite change time. In other words, the moment at which the new satellite's ephemeris information is used may not coincide with the moment at which the new satellite's ephemeris information takes effect. Therefore, based on the present application, the use of ephemeris information can be made more consistent with actual conditions, thereby avoiding the problem caused by the aforementioned moment at which the new satellite's ephemeris information is only related to the effective moment. For example, in case 1 shown in Figure 7, the terminal device can determine how to use the new satellite's ephemeris information based on the first moment, thereby avoiding the use of the new satellite's ephemeris information without changing the satellite.

[0078] Before changing the satellite time, the network device can provide the terminal device with the ephemeris information of the new satellite. The effective time of the ephemeris information of the new satellite can be earlier than the satellite time of change. In this case, the terminal device can start using the ephemeris information of the new satellite as early as possible according to the first moment (for example, using the ephemeris information of the new satellite from the first moment), thereby avoiding the situation where the terminal device has no ephemeris information available after the satellite is changed. For example, for situation 2 or situation 3 shown in Figure 7, the ephemeris information of the new satellite can be transmitted in advance before the first moment, and the ephemeris information of the new satellite can be made effective earlier than the first moment (that is, improved to situation 1). At the first moment, the terminal device can start using the ephemeris information of the new satellite. On the one hand, this solution can avoid the requirement for time alignment in situation 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 moment, thereby reducing the duration of communication interruption.

[0079] It should be noted that the first operation can be any operation that the terminal device needs to perform based on the ephemeris information. For example, the first operation can include one or more of the following operations: calculating the position of the satellite; calculating the time to send an uplink signal to the satellite; transmitting the uplink signal; calculating the timing advance (TA), etc. The uplink signal can, for example, include a preamble code for random access. In other words, the first operation can also include random access. The terminal device using the ephemeris information to perform the first operation can be understood as the terminal device using the ephemeris information; or, based on the ephemeris information, the terminal device can perform the first operation.

[0080] In response to a satellite change, the terminal device may perform a third operation. The third operation may be an operation related to ephemeris information. It is understood that the third operation is beneficial to the satellite change and / or communications after the satellite change. For example, performing the third operation can ensure the normal progress of the satellite change. Alternatively, the third operation can avoid communication anomalies after the satellite change.

[0081] The second and third operations are described below. The moment the terminal device begins executing the second operation based on the new satellite's ephemeris information can be the usage moment. In some embodiments, the usage moment can be equal to the first moment. In other words, the terminal device can begin using the new satellite's ephemeris information at the satellite time change. That is, before the satellite time change, the terminal device does not use the new satellite's ephemeris information; after the satellite time change, the terminal device uses the new satellite's ephemeris information. It will be appreciated that this avoids the situation where the new satellite's ephemeris information is used before the satellite change.

[0082] In some embodiments, the time at which the terminal device stops using the old satellite's ephemeris information can be equal to the first time. In other words, before the satellite time is changed, the terminal device uses the old satellite's ephemeris information; after the satellite time is changed, the terminal device stops using the old satellite's ephemeris information. In this case, even if the old satellite's ephemeris information has not expired, the terminal device can stop using the old satellite's ephemeris information after the satellite time is changed, thereby avoiding the erroneous use of the old satellite's ephemeris information after the satellite is changed to the new one.

[0083] In some embodiments, the method shown in Figure 8 may be performed by a network device. The method shown in Figure 8 may include steps S802 and S804.

[0084] Step S802: The network device determines a first moment.

[0085] In step S804, the network device configures one or more of the following information based on the first moment: ephemeris information of the new satellite and a first operation. In some embodiments, the method shown in FIG8 may further include step S805. In step S805, the network device may send the first ephemeris information to the terminal device.

[0086] The terminal device may determine whether the received first ephemeris information corresponds to a new satellite. In some embodiments, the terminal device may determine whether the first ephemeris information corresponds to a new satellite based on an instruction from a network device. Whether the first ephemeris information corresponds to a new satellite may be indicated explicitly or implicitly. The different methods are described below.

[0087] In the case of explicitly indicating whether the first ephemeris information corresponds to a new satellite, the network device may send first indication information to the terminal device. The first indication information may be used to indicate whether the first ephemeris information corresponds to a new satellite.

[0088] This application does not limit the indication method 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.

[0089] 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 in the first ephemeris information. As a possible implementation, when the value of the first bit is 0, the first ephemeris information does not correspond to a new satellite or the first ephemeris information corresponds to an old satellite; when the value of the first bit is 1, the first ephemeris information corresponds to a new satellite or the first ephemeris information does not correspond to an old satellite. As another possible implementation, when the value of the first bit is 1, the first ephemeris information does not correspond to a new satellite or the first ephemeris information corresponds to an old satellite; when the value of the first bit is 0, the first ephemeris information corresponds to a new satellite or the first ephemeris information does not correspond to an old satellite.

[0090] 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 in the first ephemeris information. The value of the first parameter may be true or false. As a possible implementation, when the value of the first parameter is true, the first ephemeris information does not correspond to a new satellite or the first ephemeris information corresponds to an old satellite; when the value of the first parameter is false, the first ephemeris information corresponds to a new satellite or the first ephemeris information does not correspond to an old satellite. As another possible implementation, when the value of the first parameter is false, the first ephemeris information does not correspond to a new satellite or the first ephemeris information corresponds to an old satellite; when the value of the first parameter is true, the first ephemeris information corresponds to a new satellite or the first ephemeris information does not correspond to an old satellite.

[0091] In some embodiments, the first indication information may be optional, that is, the first indication information may or may not be present in the first message that can carry the first indication information. For example, if the terminal device does not receive the indication information at the first moment, the first message may not include the first indication information; and / or, if the terminal device receives the substantive information at the first moment, the first message may include the first indication information. Alternatively, if the terminal device receives the indication information at the first moment, the terminal device may receive the first indication information; and / or, if the terminal device does not receive the indication information at the first moment, the terminal device may not receive the first indication information.

[0092] It should be noted that the message carrying the indication information of the first moment may be a first message or a second message different from the first message. The first message or the second message may, for example, include: a broadcast message and / or a radio resource control (RRC) message. The broadcast message may, for example, be a 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.

[0093] The above describes the explicit indication method of whether the first ephemeris information corresponds to a new satellite. The following describes the implicit indication method.

[0094] In some embodiments, the valid time of the first ephemeris information may be the second time, and whether the first ephemeris information corresponds to the new satellite may be determined based on the second time.

[0095] Figure 9 is a schematic diagram illustrating an implicit indication of whether the first ephemeris information corresponds to a new satellite. As shown in Figure 9, if the difference between the second time instant and the first time instant is less than or equal to a first duration threshold, the first ephemeris information may correspond to a new satellite; and / or if the difference between the second time instant and the first time instant is greater than the first duration threshold, the first ephemeris information may correspond to an old satellite. In this case, the second time instant may be earlier than the first time instant.

[0096] The present application does not limit the method for determining the first duration threshold. For example, the first duration threshold may be determined or indicated by one or more of the following methods: protocol provisions, RRC messages, medium access control control element (MAC CE), downlink control information (DCI). For another example, the first duration threshold may be indicated by a broadcast message. In the case of obtaining the first duration threshold through an RRC message, the terminal device may obtain the first duration threshold through an RRC message of the current cell (e.g., the first cell), or may obtain the first duration threshold through an RRC message of other cells. The broadcast message may include an SIB message. The RRC message may be a dedicated RRC message.

[0097] In some embodiments, the network device may indicate that the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell. Since satellite orbits are predictable, it is possible for the satellite corresponding to the neighboring cell to become the satellite corresponding to the first cell. Based on the second indication information, the terminal device can directly determine the ephemeris information of the new satellite using 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.

[0098] The network device may explicitly or implicitly indicate that the cell corresponding to the first neighboring cell will become the new satellite corresponding to the first cell.

[0099] Taking explicit indication as an example, the network device may send second indication information to the terminal device. The second indication information may be used to indicate to the terminal device that the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell. In other words, the second indication information may indicate that at the first moment, the satellite corresponding to the first cell will be changed to the satellite corresponding to the first neighboring cell.

[0100] The second indication information can be indicated by a Boolean variable, a second bit, a new parameter, etc.

[0101] For example, the second indication information can be indicated by a Boolean variable of "true" or "false." As one possible implementation, if the second indication information is true, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell; if the second indication information is false, the satellite corresponding to the first neighboring cell will not become the satellite corresponding to the first cell. As another possible implementation, if the second indication information is false, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell; if the second indication information is true, the satellite corresponding to the first neighboring cell will not become the satellite corresponding to the first cell.

[0102] For another example, the second indication information can be indicated by a second bit, i.e., a single bit. The second bit can be 0 or 1. As a possible implementation, when the second indication information is 0, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell; when the second indication information is 1, the satellite corresponding to the first neighboring cell will not become the satellite corresponding to the first cell. As another possible implementation, when the second indication information is 1, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell; when the second indication information is 0, the satellite corresponding to the first neighboring cell will not become the satellite corresponding to the first cell.

[0103] In some embodiments, the second indication information may be carried in the ephemeris information of the satellite corresponding to the first neighboring cell. If the second indication information is included in the ephemeris information of the satellite corresponding to the first neighboring cell, the satellite corresponding to the first neighboring cell will become the new satellite corresponding to the first cell; if the second indication information is not included in the ephemeris information of the satellite corresponding to the first neighboring cell, the satellite corresponding to the first neighboring cell will not become the new satellite corresponding to the first cell.

[0104] The ephemeris information of the current cell and the neighboring cells can be indicated by an ephemeris information list. That is, the ephemeris information list may include one or more ephemeris information. One or more ephemeris information may correspond to the current cell and / or the neighboring cell. Figure 10 is an example diagram of an ephemeris information list. The ephemeris information list shown in Figure 10 includes: the ephemeris information of the current cell, and the ephemeris information of three neighboring cells. As shown in Figure 10, explicit second indication information can be added to the ephemeris information of neighboring cell 1, so that the network device notifies the terminal device that "starting from the change of satellite time, the ephemeris information of neighboring cell 1 becomes the ephemeris information of this cell."

[0105] Taking 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: the ephemeris information of the terminal device's serving cell, and / or an ephemeris information list 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 the first position. The first position may be used to indicate whether the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell. Based on this approach, the network device may not send additional indication information, thereby avoiding the resource occupation caused by sending additional indication information.

[0106] In some embodiments, if the first position 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 position is the location of the first neighboring cell. 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 position is the Nth in the list of ephemeris information of one or more neighboring cells, i.e., the first position is the location of the Nth neighboring cell. That is, if the ephemeris information corresponding to the first neighboring cell is the Nth among the neighboring cells in the list, the ephemeris information corresponding to the first neighboring cell becomes the ephemeris information of the new satellite. N can be a positive integer. N can be specified by the protocol or configured by the network device. Taking the ephemeris information shown in Figure 10 as an example, when N = 1, neighboring cell 1 becomes the satellite corresponding to the first cell. When N = 2, neighboring cell 2 becomes the satellite corresponding to the first cell. When N = 3, neighboring cell 3 becomes the satellite corresponding to the first cell.

[0107] The transmission delays of the new satellite and the old satellite may be different. Therefore, for the terminal device, the subframe boundary (for example, the downlink subframe boundary) may jitter. That is, for the terminal device, the boundaries of the same frame number and / or subframe number corresponding to the new satellite and the old satellite may not overlap. The present application proposes that the fourth moment associated with the ephemeris information of the new satellite can be determined based on the following subframe boundaries: the subframe boundary before the satellite is changed; or, the subframe boundary after the satellite is changed. Based on this, the present application clarifies the subframe boundary, thereby solving the problem of unclear fourth moment caused by satellite change.

[0108] The network device may indicate, through boundary indication information, whether to determine the fourth time instant based on a subframe boundary of the new satellite or a subframe boundary of the old satellite. The boundary indication information may be carried in one or more of the following messages: an RRC message, a DCI, or a MAC CE. The boundary indication information may be configured in a Boolean, a binary symbol (one bit), or an enumeration variable.

[0109] The fourth moment may include one or more of the following moments: a moment when the ephemeris information of the new satellite becomes invalid, and a moment when the ephemeris information of the new satellite becomes effective.

[0110] For ease of understanding, the determination of the fourth moment is illustrated below using Figure 11. In the example shown in Figure 11, the terminal device receives ephemeris information from a new satellite. The effective time of the new satellite's ephemeris information is "frame number 583, subframe number 4," and the ephemeris information is valid for 10.24 seconds. When the terminal device uses this ephemeris information, it can use frame number 583, subframe number 4, corresponding to the old satellite, as the effective time to calculate the uplink transmission timing advance (TA). On the other hand, based on the ephemeris validity time of 10.24 seconds, the ephemeris information will become invalid after one rotation of the system frame number (SFN), when the frame number is 583 and the subframe number is 4. However, due to the different physical locations of the two satellites, from the perspective of the terminal device, subframe boundary jitter occurs. If the subframe boundary corresponding to the satellite corresponding to the first cell is the old satellite, the ephemeris information expiration time is calculated by adding 10.24 seconds to the starting time of the ephemeris information. The gray solid line in Figure 11 indicates the ephemeris information expiration time. However, if the ephemeris information is valid at "frame 583, subframe 4" based on the subframe boundary when the satellite corresponding to the first cell is a new satellite, the ephemeris information should also expire at "frame 583, subframe 4," which is the time indicated by the gray dashed line in Figure 11. If the expiration times calculated using the two methods differ, the protocol can specify that the terminal device use the solid gray line as the ephemeris information expiration time, or the dashed gray line as the ephemeris information expiration time, or the network device can configure the expiration time.

[0111] Next, the third operation will be described.

[0112] The third operation may be related to one or more of the following: power headroom report (PHR), TA, power adjustment value, random access, K offset (K offset), and radio link monitoring (RLM).

[0113] It should be noted that the execution time of the third operation can be related to the first time. For example, the execution time of the third operation can be the first time or later than the first time. In other words, the terminal device can execute the third operation during or after the satellite change. Alternatively, the execution time of the third operation can be earlier than the first time. In other words, the terminal device can execute the third operation in advance before the satellite change.

[0114] In some implementations, the third operation includes one or more of the following: if the terminal device triggers a first PHR before the first moment, canceling the triggering of the first PHR; triggering a second PHR; triggering TA reporting; clearing a power adjustment value; performing some or all operations after a TAT timeout by the terminal device; clearing a HARQ buffer; acquiring uplink synchronization through random access; if the terminal device initiates random access before the first moment and continues to perform random access after the first moment, clearing a first counter related to random access, incrementing a count unit, or keeping it unchanged; if the terminal device initiates random access before the first moment and continues to perform random access after the first moment, 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 for the changed satellite or a K offset of 0; clearing a second counter related to RLM; and stopping a first timer related to RLM. The above information is described below.

[0115] In some embodiments, if the terminal device triggers a 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 changing the satellite time, the terminal device may cancel the triggering of the original PHR. It should be noted that canceling the triggering of the first PHR may occur at or after the first time.

[0116] The triggering reason for a PHR is "the path loss change exceeds a threshold compared to the path loss at the time of the last PHR." However, after changing satellites, the path loss value is no longer relevant to the original path loss. In this case, the path loss that originally triggered the PHR is no longer a reference for network equipment. Therefore, canceling the triggering of the first PHR can reduce unnecessary communication processes and simplify communication procedures.

[0117] In some embodiments, the third operation may include: triggering a second PHR in response to a change of a satellite. For example, after changing the satellite time or changing the satellite, the terminal device may re-trigger the PHR.

[0118] After changing satellites, the terminal device's path loss measurement is essentially restarted. Therefore, triggering a second PHR after changing satellites as a benchmark for path loss measurement will be helpful for the network device's scheduling algorithm.

[0119] In some embodiments, the third operation may include: triggering TA reporting. For example, after changing the satellite time or changing the satellite, the terminal device may trigger TA reporting.

[0120] The change of satellite will cause the original TA value of the terminal device to become invalid. The original TA value is no longer a reference for the scheduling of network devices. Therefore, the TA value re-reported by the terminal device in this application will be a reference for the scheduling algorithm of the network device.

[0121] It should be noted that the TA triggered in the third operation can be reported through any uplink resource, and this application does not limit this. For example, the resources for reporting the TA may include one or more of the following resources: uplink resources obtained by the terminal device through random access, uplink resources obtained by the terminal device through other means. Uplink resources obtained by other means may include, for example, resources allocated to the terminal device by the network device through dynamic scheduling or semi-static scheduling.

[0122] In some embodiments, the third operation may include clearing a power adjustment value. For example, at the time of or after a satellite change, the terminal device may clear the power adjustment value. The power adjustment value may be recorded by the terminal device and is related to the transmit power of the terminal device.

[0123] The power adjustment value can be a cumulative value. For example, the network device can adjust the power of the terminal device in a cumulative 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. As a possible implementation method, the power adjustment value can be related to transmit power control (TPC). For example, the network device can continuously send TPC to the terminal device to notify the terminal device to adjust its stored power adjustment value. In this case, the power adjustment value can include the accumulated value of TPC.

[0124] In the event of a satellite change, the power adjustment value previously saved by the terminal device will no longer be valid. The technical solution of clearing the power adjustment value proposed in this application can accurately record the power adjustment value after the satellite change, so that the terminal device can determine the uplink transmission power suitable for the new satellite.

[0125] In some embodiments, the third operation may include some or all of the operations that the terminal device needs to perform after a timing advance timer (TAT) expires. That is, to a certain extent, a satellite change can be equivalent to a TAT timeout. In this case, the third operation may include, for example, clearing a hybrid automatic repeat request (HARQ) buffer and / or acquiring uplink synchronization through random access.

[0126] If the terminal device begins random access before the first moment, and needs to continue random access after the first moment, the third operation may be associated with the first counter. The first counter may be a counter related to random access. For example, the first counter may include: a counter for counting the number of random accesses and / or a counter for counting random access power ramps. In other words, the first counter may be used to count: the number of random accesses and / or the random access power ramps.

[0127] For the first counter, the third operation may include: clearing the first counter, incrementing the first counter by one count unit, or leaving the first counter unchanged. That is, during the first random access after changing satellites, the first counter may start counting from 0, increment by one count unit, or remain unchanged. The count unit may be one or more minimum technical units that the counter can count.

[0128] It should be noted that when the first counter includes multiple counters, the third operations corresponding to the multiple counters may be different or the same. Taking the example of the first counter including a counter for counting the number of random accesses and a counter for counting the random access power ramp, during the first random access after changing satellites, the first counter may use any of Modes 1 to 3 shown in Table 1 for counting.

[0129] Table 1

[0130] As shown in Table 1, if mode 1 is used, the terminal device clears all counters and restarts counting from 0. If mode 2 is used, the terminal device may increment the counter used to calculate the total number of random accesses by 1 and the counter used to calculate the power ramp of random access by 1. If mode 3 is used, the terminal device may increment the counter used to calculate the total number of random accesses by 1 and the counter used to calculate the power ramp of random access by 1 remains unchanged.

[0131] In some embodiments, if the terminal device starts random access before the first moment and continues random access after the first moment, the third operation may include: performing downlink synchronization in the case of downlink asynchrony; and / or reselecting random access resources based on the signal quality of the changed satellite.

[0132] If a terminal device is performing random access before changing satellites, and if the terminal device continues to perform random access after changing satellites, the terminal device must ensure downlink synchronization before the first random access after the satellite change. If downlink synchronization is not achieved at this time, this application proposes that the terminal device must first perform downlink synchronization before performing random access.

[0133] If a terminal device is performing random access before changing the satellite, and the random access resource selected by the terminal device is related to the signal quality, after changing the satellite time or the satellite is changed, the terminal device can reselect the random access resource based on the signal after the satellite is changed to continue random access. The signal quality may include, for example, the reference signal received power (RSRP). Taking the coverage enhancement scenario as an example, different RSRP values ​​correspond to different random access resource pools, or different RSRP values ​​may correspond to supplementary uplink (SUL) carriers or normal carriers.

[0134] It should be noted that the continued random access mentioned in this application may refer to the medium access control (MAC) layer of the terminal device continuing the random access, which may not involve RRC, that is, the continued random access is not the random access triggered again by RRC.

[0135] In some embodiments, the third operation may include an operation indicating one or more of the following information: after the first time or at the first time, the terminal device can use the K offset configured for the changed satellite or the terminal device uses a K offset of 0.

[0136] As a possible implementation method, before, before, or after the satellite time is changed, the MAC layer inside the terminal device indicates to the physical (PHY) layer that the K offset is 0. After the satellite time is changed or the satellite is changed, the terminal device can use a K offset of 0. As another possible implementation method, before the satellite time is changed, the terminal device receives a new K offset value indicated by the network device. In addition, the network device can simultaneously indicate that "the new K offset value can only be used at the satellite change time or after the satellite is changed." Furthermore, the MAC layer of the terminal device indicates the new K offset to the PHY layer. After the satellite time is changed or the satellite is changed, the terminal device can use the K offset configured by the network device for the new satellite.

[0137] In some embodiments, if the terminal device receives a K offset indicated by the network device, the terminal device may start using the K offset after the first moment. If the terminal device does not receive a K offset indicated by the network device, a K offset of 0 may be used.

[0138] In some embodiments, both the second counter and the first timer may be associated with the RLM.The third operation may include: clearing the second counter; and / or stopping the first timer.

[0139] The second counter may include, for example, a counter for the number of times a single wireless signal measurement result is greater than or equal to a first threshold, and / or a counter for the number of times a single wireless signal measurement result is less than a second threshold. The statistical value of the counter for the number of times a single wireless signal measurement result is greater than or equal to the first threshold may be used for comparison with N310, and the statistical value of the counter for the number of times a single wireless signal measurement result is less than the second threshold may be used for comparison with N311.

[0140] The first timer may be a timer for determining radio link failure (RLF). For example, the first timer may include a T310 timer.

[0141] To facilitate understanding of the second counter and the first timer, an example is given below using FIG. 12 .

[0142] As shown in Figure 12, during the RLM process, the RRC of the terminal device continuously receives the radio signal quality indication sent by the PHY layer, and determines whether a radio link failure has occurred in the current serving cell based on the indication. The radio signal quality indication may include a first indication and a second indication. The first indication may include, for example, an in sync indication; the second indication may include, for example, an out of sync indication. The first indication may indicate that the result of a single measurement of the radio signal is higher than or equal to a first threshold. The second indication may indicate that the result of a single measurement of the radio signal is lower than a second threshold. If the RRC receives the second indication continuously for more than N310 times, timer T310 may be started. During the running of T310, if the RRC receives the first indication continuously for more than N311 times, the radio link signal quality is considered normal and T310 is stopped. If the RRC receives the first indication continuously for less than N311 times, T310 continues to run. If T310 times out, the radio link may be considered to have failed.

[0143] In the process shown in Figure 12, the second counter can be used to: count the number of consecutively received second indications to determine whether it is greater than N310; and / or count the number of consecutively received first indications to determine whether it is greater than N311. The first timer can include T310.

[0144] Since the wireless signal qualities before and after the satellite change are not correlated, resetting the second counter to zero and / or stopping the first timer can avoid the influence of the old satellite on the RLM process, thereby making the RLM process more accurate.

[0145] It should be noted that whether the terminal device performs the third operation may be determined by the following methods: protocol provisions and / or network device configuration. Continuing to refer to Figure 8, step S804 may include: according to the first moment, the network device configures the third operation.

[0146] In some embodiments, the network device can be configured to determine whether to perform the third operation. The network device can indicate whether to perform the third operation through the first configuration information. This application does not limit the time at which the first configuration information is sent or received. For example, the sending or receiving time can be earlier than, later than, or equal to the first time. The sending and / or receiving time can be specified by the protocol. In addition, this application does not limit the message that carries the first configuration information. For example, the first configuration information can be carried in one or more of the following messages: an RRC message, a MAC CE, a DCI, etc.

[0147] As an implementation, the first configuration information is used to configure whether the terminal device performs one or more of the following operations: before a first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; triggering a second PHR; triggering TA reporting; clearing a power adjustment value; performing some or all operations of the terminal device after a TAT timeout; clearing a HARQ cache; acquiring uplink synchronization through random access; if the terminal device starts random access before the first moment and continues to perform random access after the first moment, clearing a first counter related to random access, adding 1 count unit, or keeping it unchanged; if the terminal device starts random access before the first moment and continues to perform random access after the first moment, performing downlink synchronization in the case of downlink asynchrony; and / or reselecting random access resources based on the signal quality of the changed satellite; using a K offset configured for the changed satellite or a K offset of 0; clearing a second counter related to RLM; and stopping a first timer related to RLM. The above information is described below.

[0148] In some embodiments, the network device may indicate the first moment to the terminal device. For example, the network device may send third indication information to the terminal device. The third indication information may be used to indicate the first moment.

[0149] In some embodiments, the first moment may be represented by an identifier of a time unit and / or an absolute time.

[0150] 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 number or ID of the time unit. That is, the first moment 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 moment may be the nearest moment in the future that meets the identifier of the time unit indicated by the third indication information. For example, the third indication information may indicate the first moment in the form of "frame number + subframe number". After receiving the third indication information, the terminal device may consider the nearest moment in the future that meets the "frame number + subframe number" as the first moment.

[0151] Absolute time can be represented by one or more of year, month, day, hour, minute, second, millisecond, and microsecond. For example, the first moment can be represented as 16:58:34:304 milliseconds on June 2, 2023.

[0152] It should be noted that this application does not limit the message that carries the third indication information. For example, the third indication information can be carried in one or more of the following messages: RRC message, MAC CE, DCI. For another example, the third indication information can be carried in a broadcast message.

[0153] The method embodiments of the present application are described in detail above, and the device embodiments of the present application are described in detail below. It should be understood that the description of the method embodiments corresponds to the description of the device embodiments, so for parts not described in detail, reference can be made to the above method embodiments.

[0154] 13 is a schematic structural diagram of a terminal device 1300 provided in an embodiment of the present application. The terminal device 1300 includes: an execution unit 1310.

[0155] The execution unit 1310 is used to execute a first operation according to a first moment; wherein the first moment is the moment when the satellite corresponding to the first cell of the terminal device is changed, and the first operation includes one or more of the following operations: a second operation executed by the terminal device starting to use the ephemeris information of the changed satellite; a third operation executed by the terminal device in response to the change of the satellite of the first cell.

[0156] In some embodiments, the terminal device performs the second operation at the moment it starts using the changed satellite ephemeris information at the first moment.

[0157] In some embodiments, the terminal device stops using the ephemeris information of the satellite before the change to perform the second operation at the first moment.

[0158] In some embodiments, the terminal device is further used to: receive first ephemeris information; and determine whether the first ephemeris information corresponds to the changed satellite.

[0159] In some embodiments, the terminal device is further used to: receive first indication information; wherein the first indication information is used to indicate whether the first ephemeris information corresponds to the changed satellite.

[0160] In some embodiments, the first indication information can be carried in the first message. If the terminal device does not receive the indication information at the first moment, the first message does not include the first indication information.

[0161] In some embodiments, the effective time of the first ephemeris information is the second time, and whether the first ephemeris information corresponds to the changed satellite is determined based on the second time.

[0162] In some embodiments, when the difference between the second moment and the first moment is less than or equal to the first duration threshold, the first ephemeris information corresponds to the changed satellite; or, when the second moment is later than or equal to the first moment, the first ephemeris information corresponds to the changed satellite.

[0163] In some embodiments, the terminal device is further used to: receive second indication information; wherein the second indication information is used to indicate that the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell.

[0164] In some embodiments, the position of the ephemeris information of the first neighboring cell in the ephemeris information list is the first position, and whether the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell is determined by the first position.

[0165] In some embodiments, when the first position is the Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell, where N is a positive integer.

[0166] In some embodiments, the fourth time corresponding to the ephemeris information of the changed satellite is determined according to the following subframe boundaries: the subframe boundary before the satellite is changed; or the subframe boundary after the satellite is changed.

[0167] In some embodiments, the fourth time includes: the expiration time of the changed satellite's ephemeris information; and / or the validity time of the changed satellite's ephemeris information.

[0168] In some embodiments, the third operation is related to one or more of the following: power headroom reporting PHR, timing advance TA, power adjustment value, random access, K offset, and radio link monitoring RLM.

[0169] In some embodiments, the third operation includes one or more of the following: before the first moment, if the terminal device triggers the first PHR, canceling the triggering of the first PHR; triggering the second PHR; triggering TA reporting; clearing the power adjustment value; some or all operations performed by the terminal device after the time advance timer TAT expires; clearing the hybrid automatic repeat request HARQ cache; obtaining uplink synchronization through random access; if the terminal device starts random access before the first moment and continues to perform random access after the first moment, clearing the first counter related to the random access, adding 1 counting unit, or keeping unchanged; if the terminal device starts random access before the first moment and continues to perform random access after the first moment, performing downlink synchronization in the case of downlink asynchrony; and / or reselecting random access resources according to the signal quality of the changed satellite; using the K offset configured by the changed satellite or a K offset with a value of 0; clearing the second counter related to RLM; stopping the first timer related to RLM.

[0170] In some embodiments, the terminal device is further used to: receive first configuration information; wherein the first configuration information is used to configure whether the terminal device performs a third operation.

[0171] In some embodiments, the first configuration information is used to configure whether the terminal device performs one or more of the following operations: before the first moment, if the terminal device triggers the first PHR, cancel the triggering of the first PHR; trigger the second PHR; trigger TA reporting; clear the power adjustment value; some or all operations performed by the terminal device after the time advance timer TAT expires; clear the hybrid automatic repeat request HARQ cache; obtain uplink synchronization through random access; if the terminal device starts random access before the first moment and the terminal device continues to perform random access after the first moment, clear the first counter related to the random access, add 1 counting unit, or remain unchanged; if the terminal device starts random access before the first moment and the terminal device continues to perform random access after the first moment, perform downlink synchronization in the case of downlink asynchrony; and / or reselect random access resources according to the signal quality of the changed satellite; use the K offset configured by the changed satellite or a K offset with a value of 0; clear the second counter related to RLM; stop the first timer related to RLM.

[0172] In some embodiments, the execution time of the third operation is later than or equal to the first time.

[0173] In some embodiments, the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

[0174] 14 is a schematic structural diagram of a network device 1400 provided in an embodiment of the present application. The network device 1400 may include a determining unit 1410 and a configuring unit 1420.

[0175] The determining unit 1410 is configured to determine a first moment, where the first moment is a moment at which a satellite corresponding to a first cell of a terminal device is changed.

[0176] Configuration unit 1420 is used to configure one or more of the following information according to the first moment: the ephemeris information of the changed satellite, and the first operation performed by the terminal device according to the first moment; wherein the first operation includes one or more of the following operations: the second operation performed by the terminal device starting to use the ephemeris information of the changed satellite; and the third operation performed by the terminal device in response to the change of the satellite in the first cell.

[0177] In some embodiments, the network device is further used to: send first ephemeris information; send first indication information; wherein the first indication information is used to indicate whether the first ephemeris information corresponds to the changed satellite.

[0178] In some embodiments, the first indication information can be carried in the first message. If the terminal device does not receive the indication information at the first moment, the first message does not include the first indication information.

[0179] In some embodiments, the network device is further configured to: send first ephemeris information; wherein the effective time of the first ephemeris information is the second time, and whether the first ephemeris information corresponds to the changed satellite is determined based on the second time.

[0180] In some embodiments, when the difference between the second moment and the first moment is less than or equal to the first duration threshold, the first ephemeris information corresponds to the changed satellite; or, when the second moment is later than or equal to the first moment, the first ephemeris information corresponds to the changed satellite.

[0181] In some embodiments, the network device is further used to: send second indication information; wherein the second indication information is used to indicate that the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell.

[0182] In some embodiments, the position of the ephemeris information of the first neighboring cell in the ephemeris information list is the first position, and whether the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell is determined by the first position.

[0183] In some embodiments, when the first position is the Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell, where N is a positive integer.

[0184] In some embodiments, the network device is further used to: send first configuration information; wherein the first configuration information is used to configure whether the terminal device performs a third operation.

[0185] In some embodiments, the first configuration information is used to configure whether the terminal device performs one or more of the following operations: before the first moment, if the terminal device triggers the first PHR, cancel the triggering of the first PHR; trigger the second PHR; trigger TA reporting; clear the power adjustment value; some or all operations performed by the terminal device after the time advance timer TAT expires; clear the hybrid automatic repeat request HARQ cache; obtain uplink synchronization through random access; if the terminal device starts random access before the first moment and the terminal device continues to perform random access after the first moment, clear the first counter related to the random access, add 1 counting unit, or remain unchanged; if the terminal device starts random access before the first moment and the terminal device continues to perform random access after the first moment, perform downlink synchronization in the case of downlink asynchrony; and / or reselect random access resources according to the signal quality of the changed satellite; use the K offset configured by the changed satellite or a K offset with a value of 0; clear the second counter related to RLM; stop the first timer related to RLM.

[0186] In some embodiments, the execution time of the third operation is later than or equal to the first time.

[0187] In some embodiments, the effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

[0188] In an optional 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 FIG15 .

[0189] Figure 15 is a schematic block 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. Apparatus 1500 may be used to implement the method described in the above method embodiment. Apparatus 1500 may be a chip, a terminal device, or a network device.

[0190] The device 1500 may include one or more processors 1510. The processor 1510 may support the device 1500 to implement the method described in the method embodiment 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, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0191] The apparatus 1500 may further include one or more memories 1520. The memories 1520 store programs that can be executed by the processor 1510, causing the processor 1510 to perform the methods described in the above method embodiments. The memories 1520 may be independent of the processor 1510 or integrated into the processor 1510.

[0192] 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 with other devices or chips via the transceiver 1530.

[0193] The present application also provides a computer-readable storage medium for storing a program. The computer-readable storage medium can be applied to a terminal or network device provided in the present application, and the program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0194] The present application also provides a computer program product. The computer program product includes a program. The computer program product can be applied to a terminal or network device provided in the present application, and the program causes a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0195] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal or network device provided in the embodiments of the present application, and the computer program enables a computer to execute the method performed by the terminal or network device in each embodiment of the present application.

[0196] It should be understood that the terms "system" and "network" in this application can be used interchangeably. In addition, the terms used in this application are only used to explain the specific embodiments of this application and are not intended to limit this application. The terms "first", "second", "third", and "fourth" in the specification and claims of this application and the accompanying drawings are used to distinguish different objects rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0197] In the embodiments of this application, the term "indication" may refer to a direct indication, an indirect indication, or an indication of an association. For example, "A indicates B" may refer to a direct indication of B, e.g., B can obtain information through A; it may refer to an indirect indication of B, e.g., A indicates C, e.g., B can obtain information through C; or it may refer to an association between A and B.

[0198] In the embodiment of the present application, "B corresponding to A" means that B is associated with A and B can be determined based on A. However, it should be understood that determining B based on A does not mean determining B based solely on A, but B can also be determined based on A and / or other information.

[0199] In the embodiments of the present application, the term "corresponding" may indicate a direct or indirect correspondence between the two, or an association relationship between the two, or a relationship between indication and indication, configuration and configuration, etc.

[0200] In the embodiments of the present application, "pre-definition" or "pre-configuration" may be implemented by pre-storing corresponding codes, tables, or other methods that can be used to indicate relevant information in a device (e.g., a terminal device and a network device). The present application does not limit the specific implementation method. For example, pre-definition may refer to information defined in a protocol.

[0201] In the embodiments of the present application, the “protocol” may refer to a standard protocol in the communications field, for example, it may include an LTE protocol, an NR protocol, and related protocols used in future communication systems, and the present application does not limit this.

[0202] In the embodiments of this application, the term "and / or" is simply a description of the association relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this document generally indicates that the related objects are in an "or" relationship.

[0203] In the embodiments of this application, the term "include" can refer to direct inclusion or indirect inclusion. Alternatively, the term "include" in the embodiments of this application can be replaced with "indicates" or "is used to determine." For example, "A includes B" can be replaced with "A indicates B" or "A is used to determine B."

[0204] In various embodiments of the present application, the size of the serial numbers of the above-mentioned processes does not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0205] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0206] 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, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0207] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0208] In the above embodiments, it can be implemented in whole or in part by software, hardware, firmware or any combination thereof. When implemented using software, it can be implemented in whole or in part 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, the process or function described in the embodiment of the present application is generated in whole or in part. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions can be transmitted from one website, computer, server or data center to another website, computer, server or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium can be any available medium that can be read by a computer or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a digital versatile disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0209] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A method for communication, characterized in that include: The terminal device performs a first operation according to the first moment; The first time is the time at which the satellite corresponding to the first cell of the terminal device is changed, and the first operation includes one or more of the following operations: The terminal device starts to perform a second operation using the changed satellite ephemeris information; The terminal device performs a third operation in response to a change in the satellite of the first cell.

2. The method according to claim 1, characterized in that The terminal device performs the second operation at the moment when it starts using the changed satellite ephemeris information at the first moment.

3. The method according to claim 1 or 2, characterized in that: The terminal device stops using the ephemeris information of the satellite before the change to perform the second operation at the first moment.

4. The method according to any one of claims 1 to 3, characterized in that Also includes: The terminal device receives first ephemeris information; The terminal device determines whether the first ephemeris information corresponds to the changed satellite.

5. The method according to claim 4, characterized in that Also includes: The terminal device receives first indication information; The first indication information is used to indicate whether the first ephemeris information corresponds to the changed satellite.

6. The method according to claim 5, characterized in that The first indication information can be carried in a first message. When the terminal device does not receive the indication information at the first moment, the first message does not include the first indication information.

7. The method according to claim 4, characterized in that The effective time of the first ephemeris information is the second time, and whether the first ephemeris information corresponds to the changed satellite is determined based on the second time.

8. The method according to claim 7, characterized in that When the difference between the second time and the first time is less than or equal to the first duration threshold, the first ephemeris information corresponds to the changed satellite; or, When the second time is later than or equal to the first time, the first ephemeris information corresponds to the changed satellite.

9. The method according to any one of claims 1 to 8, characterized in that Also includes: The terminal device receives second indication information; The second indication information is used to indicate that the satellite corresponding to the first neighboring cell of the terminal device will 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 the first position, and whether the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell is determined by the first position.

11. The method according to claim 10, characterized in that In the case where the first position is the Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell will become 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 changed satellite ephemeris information is determined according to the following subframe boundaries: The subframe boundary before the satellite change; or, Subframe boundary after satellite change.

13. The method according to claim 12, characterized in that The fourth moment includes: the expiration moment of the ephemeris information of the changed satellite; and / or the effectiveness moment of the ephemeris information of the changed satellite.

14. The method according to any one of claims 1 to 13, characterized in that The third operation is related to one or more of the following: power headroom reporting PHR, time advance TA, power adjustment value, random access, K offset, and radio link monitoring RLM.

15. The method according to claim 14, characterized in that The third operation includes one or more of the following: Before the first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; Triggering the second PHR; Trigger TA reporting; Reset the power adjustment value to zero; Some or all operations performed by the terminal device after the time advance timer TAT times out; Clear the hybrid automatic repeat request HARQ buffer; Acquire uplink synchronization through random access; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, a first counter related to the random access is cleared, increased by 1 counting unit, or remains unchanged; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, then in the case of downlink asynchronization, downlink synchronization is performed; and / or, reselecting random access resources according to the signal quality of the changed satellite; Using the K offset of the satellite configuration after the change or a K offset of 0; Clear the second counter associated with RLM; Stop the first timer associated with the RLM.

16. The method according to any one of claims 1 to 15, characterized in that Also includes: The terminal device receives first configuration information; The first configuration information is used to configure whether the terminal device performs the third operation.

17. The method according to claim 16, characterized in that The first configuration information is used to configure whether the terminal device performs one or more of the following operations: Before the first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; Triggering the second PHR; Trigger TA reporting; Reset the power adjustment value to zero; Some or all operations performed by the terminal device after the time advance timer TAT times out; Clear the hybrid automatic repeat request HARQ buffer; Acquire uplink synchronization through random access; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, a first counter related to the random access is cleared, increased by 1 counting unit, or remains unchanged; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, then in the case of downlink asynchronization, downlink synchronization is performed; and / or, reselecting random access resources according to the signal quality of the changed satellite; Use the K offset of the changed satellite configuration or a K offset of 0; Clear the second counter associated with RLM; Stop the first timer associated with the RLM.

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

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

20. A method for communication, characterized in that include: The network device determines a first moment, where the first moment is a change moment of a satellite corresponding to a first cell of the terminal device; The network device configures one or more of the following information according to the first moment: ephemeris information of the changed satellite, and a first operation performed by the terminal device according to the first moment; The first operation includes one or more of the following operations: The terminal device starts to perform a second operation using the changed satellite ephemeris information; The terminal device performs a third operation in response to a change in the satellite of the first cell.

21. The method according to claim 20, characterized in that The method further comprises: The network device sends first ephemeris information; The network device sends first indication information; The first indication information is used to indicate whether the first ephemeris information corresponds to the changed satellite.

22. The method according to claim 21, characterized in that The first indication information can be carried in a first message. When the terminal device does not receive the indication information at the first moment, the first message does not include the first indication information.

23. The method according to claim 20, characterized in that Also includes: The network device sends first ephemeris information; The effective time of the first ephemeris information is the second time, and whether the first ephemeris information corresponds to the changed satellite is determined based on the second time.

24. The method according to claim 23, characterized in that When the difference between the second time and the first time is less than or equal to the first duration threshold, the first ephemeris information corresponds to the changed satellite; or, When the second time is later than or equal to the first time, the first ephemeris information corresponds to the changed satellite.

25. The method according to any one of claims 20 to 24, characterized in that Also includes: The network device sends second indication information; The second indication information is used to indicate that the satellite corresponding to the first neighboring cell of the terminal device will 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 the first position, and whether the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell is determined by the first position.

27. The method according to claim 26, characterized in that In the case where the first position is the Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell, where N is a positive integer.

28. The method according to any one of claims 20 to 27, characterized in that Also includes: The network device sends first configuration information; The first configuration information is used to configure whether the terminal device performs the third operation.

29. The method according to claim 28, characterized in that The first configuration information is used to configure whether the terminal device performs one or more of the following operations: Before the first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; Triggering the second PHR; Trigger TA reporting; Reset the power adjustment value to zero; Some or all operations performed by the terminal device after the time advance timer TAT times out; Clear the hybrid automatic repeat request HARQ buffer; Acquire uplink synchronization through random access; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, a first counter related to the random access is cleared, increased by 1 counting unit, or remains unchanged; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, then in the case of downlink asynchronization, downlink synchronization is performed; and / or, reselecting random access resources according to the signal quality of the changed satellite; Use the K offset of the changed satellite configuration or a K offset of 0; Clear the second counter associated with RLM; Stop the first timer associated with the RLM.

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

31. The method according to any one of claims 20 to 30, characterized in that The effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

32. A terminal device, characterized in that: include: an execution unit, configured to execute a first operation according to a first moment; The first time is the time at which the satellite corresponding to the first cell of the terminal device is changed, and the first operation includes one or more of the following operations: The terminal device starts to perform a second operation using the changed satellite ephemeris information; The terminal device performs a third operation in response to a change in the satellite of the first cell.

33. The terminal device according to claim 32, characterized in that: The terminal device performs the second operation at the moment when it starts using the ephemeris information of the changed satellite at the first moment.

34. The terminal device according to claim 32 or 33, characterized in that: The terminal device stops using the ephemeris information of the satellite before the change to perform the second operation at the first moment.

35. The terminal device according to any one of claims 32 to 34, characterized in that: The terminal device is also used for: receiving first ephemeris information; Determine whether the first ephemeris information corresponds to the changed satellite.

36. The terminal device according to claim 35, characterized in that: The terminal device is also used for: receiving first indication information; The first indication information is used to indicate whether the first ephemeris information corresponds to the changed satellite.

37. The terminal device according to claim 36, characterized in that: The first indication information can be carried in a first message. When the terminal device does not receive the indication information at the first moment, the first message does not include the first indication information.

38. The terminal device according to claim 35, characterized in that: The effective time of the first ephemeris information is the second time, and whether the first ephemeris information corresponds to the changed satellite is determined based on the second time.

39. The terminal device according to claim 38, characterized in that: When the difference between the second time and the first time is less than or equal to the first duration threshold, the first ephemeris information corresponds to the changed satellite; or, When the second time is later than or equal to the first time, the first ephemeris information corresponds to the changed satellite.

40. The terminal device according to any one of claims 32 to 39, characterized in that: The terminal device is also used for: receiving second indication information; The second indication information is used to indicate that the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell.

41. The terminal device according to any one of claims 32 to 39, characterized in that: The position of the ephemeris information of the first neighboring cell in the ephemeris information list is the first position, and whether the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell is determined by the first position.

42. The terminal device according to claim 41, characterized in that: In the case where the first position is the Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell will become the 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 changed satellite ephemeris information is determined according to the following subframe boundaries: The subframe boundary before the satellite change; or, Subframe boundary after satellite change.

44. The terminal device according to claim 43, characterized in that: The fourth moment includes: the expiration moment of the ephemeris information of the changed satellite; and / or the effectiveness moment of the ephemeris information of the changed satellite.

45. The terminal device according to any one of claims 32 to 44, characterized in that: The third operation is related to one or more of the following: power headroom reporting PHR, time advance TA, power adjustment value, random access, K offset, and radio link monitoring RLM.

46. ​​The terminal device according to claim 45, characterized in that: The third operation includes one or more of the following: Before the first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; Triggering the second PHR; Trigger TA reporting; Reset the power adjustment value to zero; Some or all operations performed by the terminal device after the time advance timer TAT times out; Clear the hybrid automatic repeat request HARQ buffer; Acquire uplink synchronization through random access; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, a first counter related to the random access is cleared, increased by 1 counting unit, or remains unchanged; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, then in the case of downlink asynchronization, downlink synchronization is performed; and / or, reselecting random access resources according to the signal quality of the changed satellite; Using the K offset of the satellite configuration after the change or a K offset of 0; Clear the second counter associated with RLM; Stop the first timer associated with the RLM.

47. The terminal device according to any one of claims 32 to 46, characterized in that: The terminal device is also used for: receiving first configuration information; The first configuration information is used to configure whether the terminal device performs the third operation.

48. The terminal device according to claim 47, characterized in that: The first configuration information is used to configure whether the terminal device performs one or more of the following operations: Before the first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; Triggering the second PHR; Trigger TA reporting; Reset the power adjustment value to zero; Some or all operations performed by the terminal device after the time advance timer TAT times out; Clear the hybrid automatic repeat request HARQ buffer; Acquire uplink synchronization through random access; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, a first counter related to the random access is cleared, increased by 1 counting unit, or remains unchanged; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, then in the case of downlink asynchronization, downlink synchronization is performed; and / or, reselecting random access resources according to the signal quality of the changed satellite; Use the K offset of the changed satellite configuration or a K offset of 0; Clear the second counter associated with RLM; Stop the first timer associated with the RLM.

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

50. The terminal device according to any one of claims 32 to 49, characterized in that: The effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

51. A network device, characterized in that: include: A determining unit, configured to determine a first moment, where the first moment is a change moment of a satellite corresponding to a first cell of a terminal device; A configuration unit, configured to configure one or more of the following information according to the first moment: ephemeris information of the changed satellite, and a first operation performed by the terminal device according to the first moment; The first operation includes one or more of the following operations: The terminal device starts to perform a second operation using the changed satellite ephemeris information; The terminal device performs a third operation in response to a change in the satellite of the first cell.

52. The network device according to claim 51, characterized in that The network device is also used for: Sending the first ephemeris information; Sending first instruction information; The first indication information is used to indicate whether the first ephemeris information corresponds to the changed satellite.

53. The network device according to claim 52, characterized in that: The first indication information can be carried in a first message. When the terminal device does not receive the indication information at the first moment, the first message does not include the first indication information.

54. The network device according to claim 51, characterized in that The network device is also used for: Sending the first ephemeris information; The effective time of the first ephemeris information is the second time, and whether the first ephemeris information corresponds to the changed satellite is determined based on the second time.

55. The network device according to claim 54, characterized in that When the difference between the second time and the first time is less than or equal to the first duration threshold, the first ephemeris information corresponds to the changed satellite; or, When the second time is later than or equal to the first time, the first ephemeris information corresponds to the changed satellite.

56. The network device according to any one of claims 51 to 55, characterized in that: The network device is also used for: Sending second instruction information; The second indication information is used to indicate that the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell.

57. The network device according to any one of claims 51 to 56, characterized in that: The position of the ephemeris information of the first neighboring cell in the ephemeris information list is the first position, and whether the satellite corresponding to the first neighboring cell of the terminal device will become the satellite corresponding to the first cell is determined by the first position.

58. The network device according to claim 57, characterized in that: In the case where the first position is the Nth in the ephemeris information list of one or more neighboring cells, the satellite corresponding to the first neighboring cell will become the satellite corresponding to the first cell, where N is a positive integer.

59. The network device according to any one of claims 51 to 58, characterized in that: The network device is also used for: Sending first configuration information; The first configuration information is used to configure whether the terminal device performs the third operation.

60. The network device according to claim 59, characterized in that The first configuration information is used to configure whether the terminal device performs one or more of the following operations: Before the first moment, if the terminal device triggers a first PHR, canceling the triggering of the first PHR; Triggering the second PHR; Trigger TA reporting; Reset the power adjustment value to zero; Some or all operations performed by the terminal device after the time advance timer TAT times out; Clear the hybrid automatic repeat request HARQ buffer; Acquire uplink synchronization through random access; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, a first counter related to the random access is cleared, increased by 1 counting unit, or remains unchanged; If the terminal device starts to perform random access before the first moment, and the terminal device continues to perform the random access after the first moment, then in the case of downlink asynchronization, downlink synchronization is performed; and / or, reselecting random access resources according to the signal quality of the changed satellite; Use the K offset of the changed satellite configuration or a K offset of 0; Clear the second counter associated with RLM; Stop the first timer associated with the RLM.

61. The network device according to any one of claims 51 to 60, characterized in that: The execution time of the third operation is later than or equal to the first time.

62. The network device according to any one of claims 51 to 61, characterized in that: The effective time of the changed satellite ephemeris information is earlier than or equal to the first time.

63. A terminal device, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the terminal device executes the method as claimed in any one of claims 1 to 19.

64. A network device, characterized in that: It comprises a memory and a processor, wherein the memory is used to store a program, and the processor is used to call the program in the memory so that the network device executes the method as described in any one of claims 20-31.

65. A device, characterized in that The device comprises a processor, configured to call a program from a memory so as to enable the device to execute the method as claimed in any one of claims 1 to 31.

66. A chip, characterized in that: It comprises a processor, which is used to call a program from a memory, so that a device equipped with the chip executes a method as claimed in any one of claims 1 to 31.

67. A computer-readable storage medium, characterized in that A program is stored thereon, the program causing a computer to execute the method according to any one of claims 1 to 31.

68. A computer program product, characterized in that The method comprises a program which causes a computer to execute the method according to any one of claims 1 to 31.

69. A computer program, characterized in that The computer program enables a computer to execute the method according to any one of claims 1 to 31.

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