Method and apparatus for wireless communication

Abstract

The application provides a method and device for wireless communication, which helps to save power consumption in a network discontinuous coverage scenario. The method comprises: a terminal device sends first time information, the first time information is used for a core network to determine first configuration parameters of the terminal device; the terminal device receives the first configuration parameters, and the first configuration parameters are used for the terminal device to perform state conversion; wherein the first time information is related to a first time period and / or a second time period, the first time period is a time period from a current time to a starting time when the terminal device enters a network coverage, and the second time period is a duration of the network coverage.

Description

Technical Field

[0001] This application relates to the field of communication technology, and more specifically, to a method and apparatus for wireless communication. Background Technology

[0002] With the operation of satellites in non-terrestrial networks (NTNs), terminal devices may be in scenarios without network coverage. Due to discontinuous network coverage, how energy-efficient terminal devices should operate and how the network should be configured are issues worthy of investigation. For example, in an NTN system based on the Internet of Things (IoT), when IoT terminal devices release radio resource control (RRC) connections or when they are woken up are problems that need to be addressed. Summary of the Invention

[0003] This application provides a method and apparatus for wireless communication. The various aspects related to the embodiments of this application are described below.

[0004] In a first aspect, a method for wireless communication is provided, comprising: a terminal device sending first time information, the first time information being used by a core network to determine first configuration parameters of the terminal device; the terminal device receiving the first configuration parameters, the first configuration parameters being used by the terminal device to perform a state transition; wherein the first time information is related to a first time period and / or a second time period, the first time period being a time period from the current time to the start time of the terminal device entering a state without network coverage, and the second time period being a duration of the state without network coverage.

[0005] In a second aspect, a method for wireless communication is provided, comprising: a network device receiving first time information, the first time information being used by a core network to determine first configuration parameters of a terminal device; the network device receiving the first configuration parameters, the first configuration parameters being used by the terminal device to perform a state transition; the network device sending the first configuration parameters to the terminal device; wherein the first time information is related to a first time period and / or a second time period, the first time period being a time period from the current time to the start time of the terminal device entering a state without network coverage, and the second time period being a duration of the state without network coverage.

[0006] Thirdly, a method for wireless communication is provided, applied to a communication device corresponding to a core network. The method includes: receiving first time information, the first time information being used by the core network to determine first configuration parameters of a terminal device; determining the first configuration parameters, the first configuration parameters being used by the terminal device to perform a state transition; and sending the first configuration parameters to a network device; wherein the first time information is related to a first time period and / or a second time period, the first time period being the time period from the current time to the start time when the terminal device enters a state without network coverage, and the second time period being the duration of the state without network coverage.

[0007] Fourthly, an apparatus for wireless communication is provided, the apparatus being a terminal device, the apparatus comprising: a transmitting unit for transmitting first time information, the first time information being used by a core network to determine first configuration parameters of the terminal device; and a receiving unit for receiving the first configuration parameters, the first configuration parameters being used by the terminal device to perform a state transition; wherein the first time information is related to a first time period and / or a second time period, the first time period being the time period from the current time to the start time of the terminal device entering a state without network coverage, and the second time period being the duration of the state without network coverage.

[0008] Fifthly, an apparatus for wireless communication is provided, the apparatus being a network device, the apparatus comprising: a first receiving unit for receiving first time information, the first time information being used by a core network to determine first configuration parameters of a terminal device; a second receiving unit for receiving the first configuration parameters, the first configuration parameters being used by the terminal device to perform a state transition; and a sending unit for sending the first configuration parameters to the terminal device; wherein the first time information is related to a first time period and / or a second time period, the first time period being the time period from the current time to the start time of the terminal device entering a state without network coverage, and the second time period being the duration of the state without network coverage.

[0009] Sixthly, an apparatus for wireless communication is provided, the apparatus being a communication device corresponding to a core network, the apparatus comprising: a receiving unit for receiving first time information, the first time information being used by the core network to determine first configuration parameters of a terminal device; a determining unit for determining the first configuration parameters, the first configuration parameters being used by the terminal device to perform a state transition; and a sending unit for sending the first configuration parameters to a network device; wherein the first time information is related to a first time period and / or a second time period, the first time period being the time period from the current time to the start time of the terminal device entering a state without network coverage, and the second time period being the duration of the state without network coverage.

[0010] A seventh aspect provides a communication device including a memory and a processor, the memory for storing a program and the processor for calling the program in the memory to perform the method as described in any one of the first to third aspects.

[0011] Eighth aspect, an apparatus is provided, including a processor for calling a program from memory to perform the method as described in any one of the first to third aspects.

[0012] A ninth aspect provides a chip including a processor for calling a program from memory, causing a device having the chip mounted to perform the method as described in any one of the first to third aspects.

[0013] A tenth aspect provides a computer-readable storage medium having a program stored thereon that causes a computer to perform the method described in any one of the first to third aspects.

[0014] Eleventh aspect: A computer program product is provided, comprising a program that causes a computer to perform the method as described in any one of the first to third aspects.

[0015] In a twelfth aspect, a computer program is provided that causes a computer to perform the method described in any one of the first to third aspects.

[0016] In this embodiment, the terminal device can determine first time information. The core network can determine first configuration parameters based on the first time information, which can be used by the terminal device to perform state transitions. The first time information includes a first time period from when the terminal device has network coverage to when it enters a time without network coverage, and a second time period during which the lack of network coverage continues. Therefore, the core network considers the time information of the lack of network coverage when configuring the terminal device's transition mode, thereby better saving power consumption. Attached Figure Description

[0017] Figure 1 This is the wireless communication system used in the embodiments of this application.

[0018] Figure 2 This is an NTN system used in the embodiments of this application.

[0019] Figure 3 This is another NTN system used in the embodiments of this application.

[0020] Figure 4 This is a schematic diagram of a possible scenario where the terminal device is in a state of discontinuous coverage.

[0021] Figure 5 This is a schematic diagram of an energy-saving configuration introduced by the Internet of Things.

[0022] Figure 6 This is a schematic diagram of another energy-saving configuration introduced by the Internet of Things.

[0023] Figure 7 This is a flowchart illustrating a method for wireless communication provided in an embodiment of this application.

[0024] Figure 8 yes Figure 7 A flowchart illustrating one possible implementation of the method shown.

[0025] Figure 9 This is a flowchart illustrating another method for wireless communication provided in an embodiment of this application.

[0026] Figure 10 This is a schematic diagram of one possible configuration method for the first configuration parameter.

[0027] Figure 11 This is a diagram illustrating another possible configuration method for the first configuration parameter.

[0028] Figure 12 This is a schematic diagram of another possible configuration method for the first configuration parameter.

[0029] Figure 13 This is a schematic diagram of another possible configuration method for the first configuration parameter.

[0030] Figure 14 yes Figure 9 The flowchart illustrates one possible implementation of the method shown.

[0031] Figure 15 yes Figure 9 A flowchart illustrating another possible implementation of the method shown.

[0032] Figure 16 This is a schematic diagram of a device for wireless communication provided in an embodiment of this application.

[0033] Figure 17 This is a schematic diagram of another device for wireless communication provided in an embodiment of this application.

[0034] Figure 18 This is a schematic diagram of another device for wireless communication provided in the embodiments of this application.

[0035] Figure 19 This is a schematic structural diagram of a communication device provided in an embodiment of this application. Detailed Implementation

[0036] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art without creative effort regarding the embodiments of this application are within the scope of protection of this application.

[0037] The embodiments of this application can be applied to various communication systems. For example, the embodiments of this application can be applied to Global System for Mobile Communication (GSM), Code Division Multiple Access (CDMA), Wideband Code Division Multiple Access (WCDMA), General Packet Radio Service (GPRS), Long Term Evolution (LTE), Advanced Long Term Evolution (LTE-A), New Radio (NR), evolution systems of NR, LTE-based access to unlicensed spectrum (LTE-U), NR-based access to unlicensed spectrum (NR-U), NTN, Universal Mobile Telecommunication System (UMTS), Wireless Local Area Networks (WLAN), Wireless Fidelity (WiFi), and 5th-generation (5G) systems. The embodiments of this application can also be applied to other communication systems, such as future communication systems. These future communication systems could be, for example, 6th-generation (6G) mobile communication systems or satellite communication systems.

[0038] Traditional communication systems support a limited number of connections and are easy to implement. However, with the development of communication technology, communication systems can support not only traditional cellular communication but also one or more other types of communication. For example, a communication system can support one or more of the following communication methods: device-to-device (D2D) communication, machine-to-machine (M2M) communication, machine-type communication (MTC), enhanced machine-type communication (eMTC), vehicle-to-vehicle (V2V) communication, and vehicle-to-everything (V2X) communication. The embodiments of this application can also be applied to communication systems that support the above-mentioned communication methods.

[0039] The communication system in this application embodiment can be applied to carrier aggregation (CA) scenarios, dual connectivity (DC) scenarios, and standalone (SA) network deployment scenarios.

[0040] The communication system in this application embodiment can be applied to unlicensed spectrum. This unlicensed spectrum can also be considered a shared spectrum. Alternatively, the communication system in this application embodiment can also be applied to licensed spectrum. This licensed spectrum can also be considered a dedicated spectrum.

[0041] The embodiments of this application can be applied to NTN systems. As an example, the NTN system can be a 4G-based NTN system, an NR-based NTN system, an IoT-based NTN system, or a narrowband Internet of Things (NB-IoT)-based NTN system.

[0042] A communication system may include one or more terminal devices. The terminal devices mentioned in the embodiments of this 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 equipment, user agent, or user device, etc.

[0043] In some embodiments, the terminal device may be a station (ST) in a WLAN. In some embodiments, the terminal device may be a cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA) device, handheld device with wireless communication capabilities, computing device or other processing device connected to a wireless modem, in-vehicle device, wearable device, terminal device in a next-generation communication system (e.g., NR system), or terminal device in a future public land mobile network (PLMN) network, etc.

[0044] In some embodiments, the terminal device may be a device that provides voice and / or data connectivity to a user. For example, the terminal device may be a handheld device, an in-vehicle device, etc., with wireless connectivity. As some specific examples, the terminal device may be a mobile phone, tablet, laptop, PDA, mobile internet device (MID), wearable device, virtual reality (VR) device, augmented reality (AR) device, wireless terminal in industrial control, wireless terminal in self-driving, wireless terminal in remote medical surgery, wireless terminal in smart grid, wireless terminal in transportation safety, wireless terminal in smart city, wireless terminal in smart home, etc.

[0045] In some embodiments, the terminal device may be deployed on land. For example, the terminal device may be deployed indoors or outdoors. In some embodiments, the terminal device may be deployed on water, such as on a ship. In some embodiments, the terminal device may be deployed in the air, such as on an airplane, balloon, or satellite.

[0046] In addition to terminal devices, the communication system may also include one or more network devices. In this embodiment, the network device can be a device for communicating with the terminal device; this network device may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. In this embodiment, the network device may refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. Base stations can broadly encompass various names listed below, or be replaced by names such as: NodeB, Evolved NodeB (eNB), Next Generation NodeB (gNB), Relay Station, Access Point, Transmitting and Receiving Point (TRP), Transmitting Point (TP), Master NodeB, Secondary NodeB (SeNB), Multimode Radio (MSR) Node, Home Base Station, Network Controller, Access Node, Wireless Node, Access Point (AP), Transmitting Node, Transceiver Node, Baseband Unit (BBU), Remote Radio Unit (RRU), Active Antenna Unit (AAU), Remote Radio Head (RRH), Central Unit (CU), Distributed Unit (CU) Base stations can be macro base stations, micro base stations, relay nodes, donor nodes, or similar entities, or combinations thereof. A base station can also refer to a communication module, modem, or chip installed within the aforementioned equipment or apparatus. A base station can also be a mobile switching center, equipment performing base station functions in D2D, V2X, and M2M communications, network-side equipment in 6G networks, or equipment performing base station functions in future communication systems. Base stations can support networks using the same or different access technologies. The embodiments of this application do not limit the specific technologies or equipment forms used in the network equipment.

[0047] 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 depending on the location of the mobile base station. In other examples, a helicopter or drone can be configured as a device to communicate with another base station.

[0048] In some deployments, the network device in this application embodiment may refer to a CU or a DU, or the network device may include both a CU and a DU. The gNB may also include an AAU.

[0049] By way of example and not limitation, in the embodiments of this application, the network device may have mobility characteristics; for example, the network device may be a mobile device. In some embodiments of this application, the network device may be a satellite or a balloon station. In some embodiments of this application, the network device may also be a base station located on land, water, or other similar locations.

[0050] In this embodiment, the network device can provide services to a cell. The terminal device communicates with the network device through the transmission resources (e.g., frequency domain resources, or spectrum resources) used by the cell. The cell can be the cell corresponding to the network device (e.g., a base station). The cell can belong to a macro base station or to a base station corresponding to a small cell. The small cell can include: metro cell, micro cell, pico cell, femto cell, etc. These small cells have the characteristics of small coverage area and low transmission power, and are suitable for providing high-speed data transmission services.

[0051] In a communication system, a PLMN can consist of a set of base stations, a RAN (Radio Range), and a core network (CN). The base stations are responsible for wireless communication with terminal devices, the RAN is responsible for transmitting signals to the core network, and the core network is responsible for processing and forwarding communication data.

[0052] In some embodiments, the selection order of PLMNs is typically as follows: Registered Public Land Mobile Network (RPLMN) → Home Public Land Mobile Network (HPLMN) → User-Controlled Public Land Mobile Network (UPLMN) → Operator-Controlled Public Land Mobile Network (OPLMN). The RPLMN is the PLMN registered by the terminal device before its last power-off or disconnection from the network, and it is temporarily stored on the Universal Subscriber Identity Module (USIM) card. The operators corresponding to HPLMNs may have different number ranges. The HPLMN is the PLMN corresponding to the user's USIM's International Mobile Subscriber Identity (IMSI). The UPLMN is the list of user-controlled PLMNs. This PLMN list and the corresponding access technology (ACT) are stored in two dedicated files on the USIM card and the subscriber identity module (SIM) card. The terminal device should be able to recognize and read these files in the USIM / SIM card to perform PLMN selection; otherwise, it cannot operate. When the operator burns the card, it writes the PLMN with which it has a roaming agreement as an OPLMN into the USIM card as a network selection suggestion for the operator's users. Forbidden PLMNs (FPLMNs) are usually identified after the terminal device attempts to access a PLMN and is rejected. The terminal device will add the rejected PLMN to the FPLMN list.

[0053] In NB-IoT, the non-access stratum (NAS) typically selects the highest priority PLMN. The terminal device will first search for this designated PLMN. If the terminal device finds a cell in the designated PLMN, it will immediately initiate camping / registration. If the terminal device cannot find the designated PLMN, after searching all cells, it will find the next highest priority PLMN and attempt to camp / register.

[0054] For example, Figure 1 This is a schematic diagram of the architecture of a communication system provided in an embodiment of this application. Figure 1As shown, the communication system 100 may include a network device 110, which may be a device that communicates with a terminal device 120 (or a communication terminal, terminal). The network device 110 can provide communication coverage for a specific geographical area and can communicate with terminal devices located within that coverage area.

[0055] Figure 1 An exemplary network device and two terminal devices are shown. In some embodiments of this application, the communication system 100 may include multiple network devices and each network device may include other numbers of terminal devices within its coverage area, without limitation.

[0056] For example, Figure 2 This is a schematic diagram of an architecture of the NTN system mentioned above. Figure 2 The NTN system 200 shown uses satellite 210 as its airborne platform. For example... Figure 2 As shown, the satellite radio access network includes a satellite 210, a service link 220, a feeder link 230, terminal equipment 240, a gateway (GW) 250, and a network 260 including base stations and a core network.

[0057] Satellite 210 is a spacecraft based on a space platform. Service link 220 refers to the link between satellite 210 and terminal equipment 240. Feeder link 230 refers to the link between gateway 250 and satellite 210. The Earth-based gateway 250 connects satellite 210 to the base station or core network, depending on the NTN architecture chosen.

[0058] Figure 2 The NTN architecture shown is a bend-type transponder architecture. In this architecture, the base station is located on Earth behind gateway 250, and satellite 210 acts as a relay. Satellite 210 operates as a relay that forwards signals from feeder link 230 to serving link 220, or forwards signals from serving link 220 to feeder link 230. That is, satellite 210 does not have the function of a base station; communication between terminal device 240 and the base station in network 260 needs to be relayed through satellite 210.

[0059] For example, Figure 3 This is a schematic diagram of another architecture for the NTN system. (Example:) Figure 3 As shown, the satellite radio access network 300 includes a satellite 310, a service link 320, a feeder link 330, terminal equipment 340, a gateway 350, and a network 360. Figure 2 The difference is that satellite 310 has base station 312, and the network 360 behind gateway 350 only includes the core network. Since the base station is deployed on the satellite, the PLMN at this time only includes the core network part.

[0060] Figure 3 The NTN architecture shown is a regenerative transponder architecture. In this architecture, satellite 310 carries base station 312, which can be directly connected to the earth-based core network via a link. Satellite 310 functions as a base station, and terminal device 340 can communicate directly with satellite 310. Therefore, satellite 310 can be referred to as a network device.

[0061] exist Figure 2 and Figure 3 The communication system with the architecture shown may include multiple network devices, and each network device may include other terminal devices within its coverage area. This application embodiment does not limit this.

[0062] In the embodiments of this application, Figures 1 to 3 The communication system shown may also include other network entities such as a mobility management entity (MME) and an access and mobility management function (AMF), but this application does not limit this.

[0063] It should be understood that devices with communication functions in the network / system of this application embodiment can be referred to as communication devices. Figure 1 Taking the communication system 100 shown as an example, the communication equipment may include a network device 110 and a terminal device 120 with communication functions. The network device 110 and the terminal device 120 may be the specific devices described above, which will not be repeated here. The communication equipment may also include other devices in the communication system 100, such as network controllers, mobility management entities and other network entities. This application embodiment does not limit this.

[0064] To facilitate understanding, some related technical knowledge involved in the embodiments of this application is first introduced. The following related technologies are optional solutions and can be arbitrarily combined with the technical solutions of the embodiments of this application, all of which fall within the protection scope of the embodiments of this application. The embodiments of this application include at least some of the following contents.

[0065] With the development of communication technologies, communication systems (such as 5G) will integrate the market potential of satellite and terrestrial network infrastructure. For example, the 5G standard makes NTN, including satellite segments, part of the recognized 3rd Generation Partnership Project (3GPP) 5G connectivity infrastructure.

[0066] NTN refers to a network or network segment that uses radio frequency (RF) resources on satellite or unmanned aerial system (UAS) platforms. Taking satellites as an example, communication satellites are classified according to their orbital altitude into low Earth orbit (LEO) satellites, medium Earth orbit (MEO) satellites, geostationary Earth orbit (GEO) satellites, and highly elliptical orbit (HEO) satellites. LEO is a geocentric orbit with an altitude of 2000 kilometers or less, or at least 11.25 cycles per day, with an eccentricity of less than 0.25. Most man-made objects in outer space are located in LEO. LEO satellites orbit the Earth at high speeds (mobility), but in predictable or deterministic orbits.

[0067] Satellites at different orbital altitudes have different orbital periods. For example, typical LEO altitudes range from 250 to 1500 kilometers with orbital periods of 90 to 120 minutes. Typical MEO altitudes range from 5000 to 25000 kilometers with orbital periods of 3 to 15 hours. GEO altitudes are approximately 35786 kilometers with an orbital period of 24 hours.

[0068] From the example of satellites mentioned earlier Figure 2 and Figure 3 It is known that typical scenarios for terminal devices accessing the NTN system involve NTN transparent payloads or NTN regenerated payloads. Among these, Figure 2 The bent-tube transponder architecture shown corresponds to the NTN transparent payload. Figure 3 The regenerative transponder architecture shown corresponds to the NTN regenerative payload.

[0069] In the NTN system, communication equipment can infer the trajectory of the cells that the satellite can serve by using the satellite's ephemeris and epoch time. The satellite ephemeris contains information such as the satellite's position and velocity at a specific epoch time. The epoch time is a reference time point for the satellite's orbital parameters. The ephemeris also includes parameters such as the satellite's semi-major axis, eccentricity, inclination, and ascending node longitude.

[0070] In some embodiments, the terminal device can calculate the satellite's orbit using satellite ephemeris tables and epoch times. For example, the terminal device can calculate the satellite's orbital parameters based on Kepler's laws. Furthermore, using the orbital parameters and time information, the satellite's position at a future point in time can be predicted. As another example, considering the satellite's motion in its orbit and the Earth's rotation, the satellite's parameters can be calculated using mathematical models.

[0071] As an example, for a satellite in an elliptical orbit with a semi-major axis of a, an eccentricity of e, an inclination of i, an ascending node longitude of Ω, a perigee parameter of ω, and an average perigee angle of M, the average perigee angle at time t can be expressed as: M(t)=M0+n*(t-t0);

[0072] Where M(t) is the average anomaly angle of the satellite, M0 is the average anomaly angle corresponding to epoch time t0, and n is the average angular velocity.

[0073] By solving Kepler's equations, we can obtain the anomalous angle E: E―e*sin(E)=M(t).

[0074] The angle E of the deviated point can be converted to the true angle ν using the following formula:

[0075] After determining the true anomaly angle, the satellite's position in its orbit can be calculated using orbital parameters. In other words, the satellite's position is represented by its orbital equations. The distance r between the satellite and the Earth's center can be calculated using the following formula: r = a * (1 - e) 2 ) / (1+e*cos(v)).

[0076] Furthermore, the satellite's position (x, y, z) in a Cartesian coordinate system is calculated using orbital parameters and true anomaly angle:

[0077] x=r*(cos(Ω)*cos(ω+ν)-sin(Ω)*sin(ω+ν)*cos(i));

[0078] y=r*(sin(Ω)*cos(ω+ν)+cos(Ω)*sin(ω+ν)*cos(i));

[0079] z = r*sin(i)*sin(ω+ν).

[0080] In an NTN system, multiple satellites can form a constellation to provide services to terminal devices within an NTN cell. In contrast, satellites in a mobile Earth cell can provide service for a shorter period than those in a fixed Earth cell. In a mobile Earth cell, the coverage time depends on the satellite's footprint, which is related to its orbital altitude. For example, a LEO satellite with a beamwidth of up to 1000 kilometers has a maximum coverage time of approximately 130 seconds.

[0081] However, even during satellite constellation operation, ground-based terminal devices may still be in scenarios without network coverage. That is, even under NTN network coverage, terminal devices may be experiencing discontinuous coverage. The following section provides an example of a discontinuous coverage scenario.

[0082] In some embodiments, due to the limited number of satellites in orbit, network service may be discontinuous for a given terminal device on the ground. For example, in an IoT-based mobile cell, a terminal device may not have any satellites available to provide service at any given time. In other words, the network service provided to that IoT device is discontinuous.

[0083] In some embodiments, even if the terminal device is located within the geographical coverage area of ​​a satellite, the satellite's beam coverage may not include the terminal device. In this scenario, the terminal device may also be located in an area of ​​discontinuous coverage. For ease of understanding, the following uses a mobile cell as an example, combined with... Figure 4 The following example illustrates a scenario of discontinuous coverage.

[0084] exist Figure 4 In the NTN system shown, both terminal device 410 and terminal device 420 are located within the geographical coverage area of ​​satellite 430. Specifically, terminal device 410 is located near position 401 (vertical to the ground) of satellite 430, while terminal device 420 is located near position 402. Figure 4 It can be seen that the beam center of satellite 430 at epoch time t corresponds to ground position 402, and satellite 430 can provide services to terminal device 420. However, since the beam center is not perpendicular to the ground projection position 401 of satellite 430, satellite 430 cannot provide services to terminal device 410, so terminal device 410 is in a scenario of discontinuous coverage.

[0085] The previous section used the Internet of Things (IoT) as an example to analyze the reasons for discontinuous coverage in NTN networks. Applications such as IoT and MTC are experiencing exponential growth and are expected to play a crucial role in future networks and systems. In these systems, terminal devices transmit data at low frequencies and do not need to constantly communicate with network devices. To save energy, the network side can configure various energy-saving modes for terminal devices.

[0086] For example, NB-IoT can support three power-saving modes: Power Saving Mode (PSM), Discontinuous Reception (DRX) mode, and Extended DRX mode. In PSM mode, the terminal device does not need to receive paging to detect the presence of downlink service. Compared to DRX mode, terminal devices in eDRX mode have a longer paging detection cycle.

[0087] Furthermore, NB-IoT employs PSM and eDRX modes to save power consumption in terminal devices. For example, whether a terminal device uses PSM and eDRX depends on the terminal device's capabilities and the network-side configuration. Regarding capabilities, the network will not configure capabilities that the terminal device does not support. Regarding configuration, even if the terminal device supports the capability, the configuration may differ depending on the network.

[0088] The following uses PSM mode as an example to illustrate the working process of power-saving mode. Terminal devices supporting PSM mode will enter PSM state after being in idle state for a period of time. In PSM state, the power amplifier (PA) of the terminal device stops working. That is, the radio frequency (RF) section of the terminal device stops working. In addition, the access stratum (AS) of the terminal device stops some related functions to reduce power consumption in RF, signaling processing, and other parts, thereby achieving low power consumption.

[0089] On the other hand, because the radio frequency section of the terminal device stops working, the terminal device cannot receive any paging or scheduling. From the network side, the terminal device is in an unreachable state at this time. In the unreachable state, data and SMS messages cannot reach the terminal device. However, the terminal device is still marked as registered in the network. Therefore, when the terminal device is woken up from the PSM state (unreachable state), it does not need to re-establish a public data network (PDN) connection, but can directly send data.

[0090] In PSM mode, the state transitions of the terminal device can be implemented using two timers: the T3324 timer and the T3412 timer. For ease of understanding, the following explanation will illustrate this further. Figure 5 and Figure 6 Different energy-saving modes are illustrated with examples. Figure 5 and Figure 6 In the graph, the horizontal axis represents time, and the vertical axis represents energy consumption.

[0091] Depend on Figure 5 It can be seen that the terminal device can transmit data with higher energy consumption in the active state, and mainly receive data with relatively lower energy consumption in the idle state. After the idle state lasts for a period of time, if it does not re-enter the active state, the terminal device will directly enter the even lower energy consumption PSM state. The period of time the terminal device is in the idle state is the duration of the T3324 timer.

[0092] See also Figure 5 A complete tracking area update (TAU) cycle is the sum of the IDLE and PSM times. The duration of a TAU cycle is defined as the duration of timer T3412. Therefore, T3412 is the TAU duration, while T3324 is the timer for transitioning from the IDLE state to the PSM state.

[0093] Under certain access point networks (APNs), terminal devices can modify the T3412 and T3324 timers using standard instructions specified in the 3rd generation partnership project (3GPP) protocol.

[0094] As an example, in NB-IoT, terminal devices can communicate and configure NB-IoT modules using attention (AT) commands. AT commands are sent from the terminal device or data terminal to the terminal adapter or data circuit terminal. The terminal device controls the mobile station's functions and interacts based on various network services by sending AT commands. The terminal device can also send these commands to the narrowband (NB) module. The module can carry the AT commands in confirmable (CON) or non-confirmable (NON) messages sent to the NB-IoT platform.

[0095] As an example, a terminal device can modify timers T3412 and T3324 using the command AT+CPSMS. CPSMS stands for Control Plane Support for Mobile Termination Services. The AT+CPSMS command can be used to set relevant parameters of the PSM (Power Management System). In NB-IoT communication, AT+CPSMS is an AT command used to control the PSM.

[0096] Figure 6The relevant parameters in eDRX mode are illustrated. In traditional DRX mode, the minimum interval is 2.56 seconds (DRX cycle), which is too frequent for IoT devices where data transmission is infrequent. To further reduce power consumption caused by paging, NB-IoT introduces enhanced discontinuous reception (eDRX) technology. Within each eDRX cycle, there is a paging time window (PTW). Within the PTW, the terminal device listens for paging messages sent from the network side and responds.

[0097] It should be noted that terminal devices can only listen to the paging channel according to the DRX cycle within the PTW (Pending Termination Warp) period in order to receive downlink services. Because the DRX cycle is short, the terminal can be considered to be always reachable within the PTW period, without going into sleep mode. Outside the PTW period, it is in a sleep state, does not listen to the paging channel, and cannot receive downlink services. Therefore, the PTW window is a state of eDRX; once the PTW window expires, the device enters a silent state until the next PTW period when it can receive paging.

[0098] Depend on Figure 6 It can be seen that the terminal device intermittently listens for paging during the eDRX cycle in idle state, reducing power consumption. Specifically, after one PTW (Paging Before Warp) cycle, the terminal device enters a silent state, waiting for the eDRX cycle to complete before re-entering the PTW to listen for paging. When a paging occurs outside the PTW, the terminal device cannot respond to the paging; instead, it needs to wait for the paging buffered on the network side to be re-sent and fall within the PTW before it can successfully respond. Therefore, the sleep time of the terminal device in eDRX mode is relatively long.

[0099] During communication, the network side (core network) can configure various power-saving mode parameters for terminal devices. For example, the network side can configure eDRX-related parameters for terminal devices through AMF or MME.

[0100] As an example, the terminal device can first negotiate with the MME to obtain a terminal device-specific eDRX, and then calculate the paging hyperframe (PH) to obtain the hyper-system frame number (H-SFN) of the paging message. Next, the terminal device can calculate the possible system frame number (SFN) range where its paging message resides by calculating the paging time window (PTW). The PTW is terminal device-specific and can be determined by the PH, its start position (PTW_start), and its end position (PTW_end) within the PH. Finally, the terminal device can obtain the subframe where the paging message resides through the paging frame (PF) and the paging occasion (PO).

[0101] Simultaneously, the core network can also configure appropriate eDRX cycles for terminal devices. The position of PH, PTW_start, and PTW_end are mainly determined by the eDRX cycle, PTW length, and the terminal device's identity (ID). For example, PH, PTW_start, and PTW_end can be determined according to the following formula:

[0102] H-SFN mod TeDRX,H=(UE_ID_H mod TeDRX,H);

[0103] The UE_ID_H is determined as follows: if the paging radio network temporary identifier (P-RNTI) is monitored on the physical downlink control channel (PDCCH) or the MTC physical downlink control channel (MTC PDCCH, MPDCCH), then the ID is the most significant 10 bits of the hash function; if the P-RNTI is monitored on the narrow band physical downlink control channel (NPDCCH), then the ID is the most significant 12 bits of the hash function.

[0104] TeDRX,H is the eDRX cycle of the terminal device within a superframe. Typically, TeDRX,H = 1, 2, ..., 256 superframes. For NB-IoT, TeDRX,H = 2, ..., 1024 superframes. TeDRX,H is configured by the upper layer. 1 superframe = 1024 SFN times, or 10.24 seconds. Therefore, the possible time range for the eDRX cycle is 20.48 seconds to 2.9127 hours.

[0105] PTW_start represents the first radio frame of the PH. PTW_start is the SFN that satisfies the following equation:

[0106] SFN = 256 * ieDRX, where ieDRX = floor(UE_ID_H / TeDRX,H)mod 4.

[0107] PTW_end is the last radio frame of a PTW. PTW_end is an SFN that satisfies the following equation:

[0108] SFN = (PTW_start + L * 100 - 1) mod 1024, where L is the paging time window length (in seconds) configured by the upper layer.

[0109] The above text combined Figure 5 and Figure 6 This section introduces various energy-saving modes and related parameters for eDRX mode. Figure 5 and Figure 6 It can be seen that the terminal device consumes less energy in the idle state and PSM state, thus achieving energy saving.

[0110] As discussed earlier, NTN coverage can lead to scenarios with discontinuous network coverage. When IoT and MTC are under NTN coverage, the time window of no network coverage may misalign with the window when terminal devices are unreachable, affecting energy efficiency and communication quality. Therefore, how IoT terminal devices operate under discontinuous coverage conditions is a problem worthy of investigation.

[0111] Furthermore, as mentioned earlier, the DRX, eDRX, and PSM configurations of terminal devices are configured by the core network. However, when a terminal device is within an NTN (Network Network), receiving signals from a base station via satellite is part of the access network process. The core network may not be aware of the access network's coverage and therefore will not proactively consider configuring eDRX and PSM configurations for the terminal device that match the communication scenario of discontinuous satellite signal coverage. This is also a problem worthy of further investigation.

[0112] For example, when a terminal device attempts to establish a connection with a satellite, the remaining time of satellite coverage may be too short, preventing the connection from being established. For example, when a terminal device is about to lose network coverage, it may be in a woken-up or idle state, and the power consumed by the terminal device attempting to send data or receive paging may be wasted. Therefore, terminal devices in IoT or MTC applications need to consider scenarios with discontinuous coverage to better save power and ensure communication quality.

[0113] It should be noted that the issue mentioned above, where IoT energy-saving configurations may be affected by discontinuous coverage of the NTN system, is only an example. The embodiments of this application can be applied to any type of scenario where the configuration of terminal devices is affected by discontinuous network coverage.

[0114] Based on this, this application proposes a method for wireless communication. Through this method, a terminal device can predict the first moment information when entering a network-free environment, and thus perform different state transitions based on the first moment information to save power consumption or successfully establish communication with a satellite. For ease of understanding, the following describes... Figure 7 The methods proposed in the embodiments of this application will be described in detail.

[0115] See Figure 7 In step S710, the terminal device determines the first time information.

[0116] The terminal device can be any type of terminal device mentioned above, and there is no limitation here.

[0117] In some embodiments, the terminal device is a device that communicates via a satellite in an NTN system. Exemplarily, when a base station is deployed on a satellite, the terminal device communicates directly with the base station on the satellite. Exemplarily, when the satellite acts as a relay, the terminal device communicates with terrestrial network equipment via the satellite.

[0118] As an example, the terminal device is currently located within the service area of ​​the first satellite in the NTN. The current time can be any state the terminal device is in. For example, the terminal device can be in an RRC active state at the current time. For example, the terminal device can be in an RRC idle state at the current time. For example, the terminal device can be in a PSM state at the current time.

[0119] The first satellite can be the satellite that provides service to the terminal device at the current moment, i.e., the current satellite. That is, the terminal device has already established a connection with the first satellite at the current moment, or the terminal device can establish a connection with the first satellite. For example, the terminal device is located within the geographical coverage area of ​​the first satellite. For example, the terminal device is located within the signal coverage area of ​​the first satellite at the current moment.

[0120] As an example, let's assume the terminal device is currently in a scenario with network coverage.

[0121] In some embodiments, the terminal device is a communication device with a low service transmission rate or low data transmission volume. For example, the terminal device is a communication device in NB-IoT. Another example is a communication device in MTC applications.

[0122] In some embodiments, the terminal device is a device that supports energy-saving or low-power configuration. That is, the terminal device can achieve energy saving during operation through parameters configured in the network device or core network. For example, the terminal device has the capability to support DRX configuration or eDRX configuration. Another example is that the terminal device has the capability to support PSM configuration.

[0123] First-time information refers to time parameters related to scenarios where the network coverage of the terminal device is discontinuous. In some embodiments, first-time information refers to time parameters related to when the terminal device moves from a scenario with network coverage to a scenario without network coverage. In some embodiments, first-time information refers to time parameters related to when the terminal device moves from a scenario without network coverage to a scenario with network coverage.

[0124] As an example, a terminal device entering a scenario with no network coverage can also mean that the terminal device is in a scenario with discontinuous network coverage. Discontinuous network coverage can also be called discontinuous cell coverage. That is to say, the terminal device may be within the coverage area of ​​one cell at some times, but may not be within the coverage area of ​​any cell at other times.

[0125] As an example, when a terminal device is within cell coverage, the cell can use a system information block (SIB) to indicate whether discontinuous coverage is supported and provide the necessary information for discontinuous coverage prediction.

[0126] In some embodiments, the first time information includes the time during which the terminal device can be outside network coverage, and therefore can also be referred to as out-of-coverage indication information. In some embodiments, the first time information can be used by the terminal device to release the RRC connection, and therefore can also be referred to as release assistance information. In some embodiments, the first time information is related to the unreachable state of the terminal device, and therefore can also be referred to as unreachable information.

[0127] First-time information relates to a first time period and / or a second time period. As an example, first-time information may include a first time period and / or a second time period. As an example, first-time information can be used to determine a first time period and / or a second time period.

[0128] As an example, a first or second time period can include one or more time parameters for that time period. These time parameters can include the start time (start moment), end time (end moment), and duration of the time period.

[0129] As an example, the first-time information may include at least one of the following: the duration of no network coverage, the time of entering no network coverage, and the time of returning to network coverage.

[0130] In some embodiments, the first time information can indicate the time parameters of a first time period. The first time period is the time from the current moment to the start time when the terminal device enters a state of no network coverage. That is, after the first time period, the terminal device will lose network coverage. If the terminal device can predict the time of coverage loss, it can check whether the remaining time of current cell coverage is long enough to accommodate connection establishment, thereby ensuring that the terminal device can successfully establish communication with the network device. In addition, for terminal devices that are about to lose coverage, preparations can be made in advance to further save power consumption.

[0131] As an example, the first time period can indicate the starting time when the terminal device leaves the satellite signal coverage area. This starting time is also the critical time when the terminal device is at the edge of satellite signal coverage. This starting time is the starting time when the terminal device enters a state of no network coverage.

[0132] As an example, the first time period is the time period during which the terminal device arrives at the current cell edge.

[0133] As an example, a terminal device will switch to another serving cell before reaching the edge of the current cell. The first time period is the time period during which the terminal device moves from its current location to the edge of another cell that no longer undergoes cell handover.

[0134] As an example, the terminal device does not perform satellite handover before reaching the edge of the current cell, and the first time period is the time period from the current location to the edge of the current cell.

[0135] In some embodiments, the first time information may indicate the time parameter of the second time period. The second time period is the duration of the period without network coverage. That is, after the second time period, the terminal device will enter a scenario with network coverage. The second time period may also be called an uncovered gap or an unavailable period. If the terminal device can determine the duration of the period without network coverage, it can be woken up in time when it enters network coverage to ensure communication.

[0136] As an example, the start time of the second time period is the start time when the terminal device enters a state without network coverage. The end time of the second time period is the moment when the terminal device moves from a state without network coverage to a state with network coverage.

[0137] In some embodiments, due to the periodic operation of the satellite constellation, the first and second time periods when the terminal device enters a network coverage-free scenario are also periodic. When the terminal device enters a network coverage-free environment, it may enter a network unreachable state such as PSM (Power Segmentation Mode). Therefore, the first period during which the terminal device is woken up can be determined based on the periodic first and second time periods.

[0138] As an example, the first cycle can be used to determine when a terminal device is woken up from a sleep / silent / PSM state.

[0139] As an example, the re-entry time of the terminal device into satellite signal coverage can be determined based on the first and second time periods. Based on this re-entry time, the terminal device can configure the interval at which it sends a wake-up request to the core network or network equipment, thus determining the first cycle for the terminal device to be woken up in the recommended information.

[0140] In some embodiments, the first time information may indicate time parameters for a first time period and a second time period. The terminal device can determine the duration of network coverage and the duration of no network coverage in discontinuous coverage based on the first time information, thereby recommending appropriate configuration parameters to the network device or core network to match the discontinuous coverage scenario.

[0141] As an example, the terminal device can determine the recommended configuration parameters, or recommended information, based on the information obtained in real time.

[0142] Terminal devices can determine the first-time information based on various factors. Based on this information, the terminal device can predict when discontinuous coverage will begin, thereby determining when to release the RRC connection to avoid triggering a radio link failure (RLF). Furthermore, the terminal device can synchronize the first-time information with the network device to promptly release the terminal device into the RRC idle state (RRC_IDLE).

[0143] In some embodiments, the terminal device may determine first-time information by making predictions based on one or more types of information. This one or more types of information may also be referred to as necessary information for predicting discontinuous coverage. Exemplarily, the first-time information may be related to one or more of the following: the location information of the terminal device; the relative position information of the terminal device and a first satellite; and relevant information of multiple satellites associated with the terminal device. The multiple satellites include the first satellite.

[0144] As an example, the first-hand information can be determined based on one or more of the information mentioned above.

[0145] In some embodiments, the terminal device can predict first-time information based on its own location information. The location information of the terminal device can be determined based on a Global Navigation Satellite System (GNSS). For example, the location information of the terminal device may include location change information of the terminal device. This location change information may be, for example, the motion information of the terminal device.

[0146] As an example, when the terminal device is currently in RRC active state, it can determine the edge change of the serving cell based on communication with the satellite. The terminal device can estimate its arrival time at the cell edge based on its own location information, thereby determining the first time period.

[0147] In some embodiments, the first time information can be determined based on the relative position information between the terminal device and the first satellite. The relative position information may include the elevation angle of the terminal device relative to the first satellite, and / or the distance between the terminal device and the edge of the service area of ​​the first satellite.

[0148] As an example, in the case of discontinuous coverage in IoT NTN, the elevation angle or rate of change of elevation angle of the terminal device relative to the first satellite can be used to determine whether the terminal device will enter the discontinuous coverage area. For example, when the elevation angle of the terminal device relative to the first satellite is less than 5 degrees, the terminal device can determine that it will soon leave the service area of ​​the first satellite.

[0149] As an example, a terminal device can determine whether it will leave the coverage area of ​​the first satellite based on its distance from the edge of the service area. For instance, when the reference position of the terminal device from the cell edge is less than a certain set value, the terminal device will soon enter discontinuous coverage.

[0150] In some embodiments, the first time information may be related to the location information of the terminal device and the ephemeris / location information of the first satellite. For example, the terminal device can obtain the ephemeris information of the first satellite according to an ephemeris table. The terminal device can determine the remaining duration of its coverage area with the first satellite based on its own location and ephemeris information, and thus determine the first time information based on that duration. Based on this first time information, the terminal device can determine the duration for which the terminal device can be woken up in the recommended information.

[0151] As an example, for a ground-based fixed cell served by non-geostationary orbit (NGSO) satellites, the network can provide cell dwell time. Optionally, the terminal device can estimate its arrival time at the cell edge based on the service time (T-service). Optionally, the terminal device can estimate satellite parameters and first-time information based on GNSS positioning information.

[0152] As an example, in the case of a mobile cell, the network cannot provide a stop time. Therefore, the terminal device can predict the duration of cell service based on the reference position of the first satellite in the broadcast. For example, the terminal device can predict the duration of cell service according to the formula for calculating the satellite position (x, y, z) mentioned above.

[0153] In some embodiments, the first-time information can be determined based on relevant information from multiple satellites associated with the terminal device. The multiple satellites associated with the terminal device can refer to satellites that are currently or may soon provide service to the terminal device. Exemplarily, the multiple satellites include a first satellite currently providing service to the terminal device. Exemplarily, the multiple satellites also include one or more satellites other than the first satellite. These one or more satellites can be any one or any multiple satellites that may soon provide service to the terminal device.

[0154] As an example, multiple satellites can be some or all of the satellites in a satellite constellation associated with a terminal device.

[0155] As an example, in a mobile cell, the serving cell is typically an area served by one or more satellites. This serving cell can be the serving cell where the terminal device is located. Multiple satellites can include satellites providing service to that serving cell.

[0156] In some embodiments, the relevant information of the multiple satellites may include at least one of the following: ephemeris information of the multiple satellites, position information of the multiple satellites, beam information of the multiple satellites, and time information of the multiple satellites providing services to the terminal device. Since the multiple satellites include the first satellite, the relevant information of the multiple satellites also includes the relevant information of the first satellite.

[0157] In some embodiments, information related to multiple satellites can be carried in an SIB. Network devices can broadcast the SIB to enable terminal devices to receive information related to multiple satellites. For example, a network device can indicate support for discontinuous coverage by broadcasting SIB32 or other information blocks containing first satellite information (e.g., ephemeris and beam information). SIB32 will be used as an example in the following description.

[0158] As an example, information about multiple satellites can be carried in one or more of the following: SIB3, SIB31, SIB32.

[0159] As an example, information about the primary satellite can be carried within auxiliary information. When the terminal device is on an NTN network, the auxiliary information can include satellite ephemeris information and other information related to the satellite's network coverage. Based on the auxiliary information, the terminal device can predict whether it will lose satellite network coverage or whether it is currently within satellite network coverage, thereby determining the relevant time information for the loss of network coverage.

[0160] As an example, information about satellites other than the first satellite can also be transmitted via RRC signaling. For instance, after receiving the initial information, the first satellite can use proprietary RRC signaling to notify the terminal device of any other mobile satellites nearby. If other satellites are present, the terminal device can be further notified of their ephemeris parameters.

[0161] Optionally, the initial time information can be determined based on the ephemeris information or position information of multiple satellites. The ephemeris information of multiple satellites can be used to determine the position information of multiple satellites. For example, the position information of satellites can be determined based on ephemeris tables and epoch times.

[0162] As an example, when the relevant information of multiple satellites includes the location information of multiple satellites, the terminal device can estimate the trajectory of the serving cell on Earth by predicting this location information.

[0163] As an example, by obtaining the position information of multiple satellites or any one of them, the trajectory of the satellites at different times can be plotted. Terminal devices can then predict the time of entering and leaving satellite coverage based on these trajectory parameters.

[0164] As an example, a terminal device can predict the time when other satellites will cover it and the time when it will leave the currently serving satellite (the first satellite) by using the satellite and ephemeris parameters of other movable satellites around it sent by the first satellite.

[0165] As an example, the orbit of any one of the multiple satellites may vary slightly. To ensure the accuracy of the prediction, the terminal device can periodically update the prediction results.

[0166] Optionally, the initial time information can be determined based on satellite beam information, thereby more accurately predicting the remaining time the terminal device will be within the satellite coverage area. However, in mobile cell scenarios, if the terminal device relies solely on satellite ephemeris information for prediction, significant deviations may occur. For example, due to… Figure 4 The beam center of a satellite is not perpendicular to its position, and ephemeris data alone may not be sufficient for a terminal device to determine whether it will be within the satellite's coverage area at a given time. In other words, discontinuous coverage predictions based solely on ephemeris information may be inaccurate. To improve accuracy, the necessary information for predicting discontinuous coverage can include ephemeris data and beam information from multiple satellites.

[0167] As an example, when an SIB contains beam information for any of multiple satellites, it indicates that the cell supports discontinuous coverage. In other words, the information in the SIB can implicitly indicate whether a cell supports discontinuous coverage. For instance, when SIB32 contains beam information for a serving satellite, SIB32 can indicate that the cell for that serving satellite supports discontinuous coverage. Based on the beam information in the SIB, the terminal device can predict relatively accurately how long it can remain within the coverage area of ​​the first satellite. Combined with the location information of the terminal device and the satellite, the terminal device can roughly know when it will enter discontinuous coverage. Conversely, when SIB32 does not contain beam information, it indicates that discontinuous coverage is not supported.

[0168] As an example, when the SIB includes beam information of any one of multiple satellites, the terminal device sends the first-time information.

[0169] Optionally, the first time information can be determined based on the time information of multiple satellites providing services to the terminal device. The time information of multiple satellites providing services can be determined based on the ephemeris information and beam information of multiple satellites. For example, the duration of services provided by multiple satellites can be used to determine a first time period and / or a second time period.

[0170] As an example, the first duration is the remaining duration of service provided by the first satellite. That is, the first duration is the time between the current moment and the moment the terminal device leaves the service area of ​​the first satellite. The second duration represents the time information for coverage of the terminal device by multiple other satellites. These other satellites will have multiple start times for coverage. There are multiple durations between the current moment and these multiple start times, and the minimum of these durations is the second duration. That is, the second duration is the minimum of one or more durations between the current moment and one or more times when one or more satellites begin providing service to the terminal device. The first time period can be determined based on the first and second durations.

[0171] For example, if the first duration is greater than or equal to the second duration, the duration of the first time segment is greater than the first duration.

[0172] For example, if the first duration is less than the second duration, then the duration of the first time period is equal to the first duration.

[0173] For example, when the terminal device does not switch satellites before leaving the first satellite service area, the duration of the first time period is the first duration.

[0174] First-time information can be carried in multiple forms. Optionally, first-time information can be carried in one or more of the following: auxiliary information of the terminal device, downlink channel quality report (DCQR), and access stratum release assistance indication (AS RAI).

[0175] In some embodiments, the terminal device can report first-time information to the first satellite via RRC proprietary signaling. This RRC proprietary signaling may include auxiliary information from the terminal device.

[0176] In some embodiments, the first-time information can be carried in a newly added information field. For example, an information field for sending the first-time information can be added based on DCQR. Alternatively, a corresponding information field for sending the first-time information can be added based on AS RAI.

[0177] As an example, the terminal device can send an AS RAI command carrying first-time information to the NB module. The module carries this AS RAI when sending a CON or NON message to NB-IoT, thereby achieving the transmission of first-time information.

[0178] See also Figure 7 In step S720, based on the first time information, the terminal device performs a transition from the first state to the second state.

[0179] The first state can be the state of the terminal device at the current moment, or it can be the state at other moments; there is no limitation here.

[0180] The second state can be any state different from the first state. In some embodiments, the first state and the second state can be any two of the three states: RRC active state, RRC idle state, and PSM state. That is, the state transition performed by the terminal device can include a transition between any two of the three states: RRC active state, RRC idle state, and PSM state.

[0181] As an example, the first state is the RRC active state, and the second state is the RRC idle state.

[0182] As an example, the first state is the PSM state, and the second state is the wake-up state. The PSM state can also be called the unreachable state.

[0183] As an example, the first state is either the RRC idle state or the PSM state, and the second state is the RRC active state.

[0184] When a terminal device performs a transition from a first state to a second state, it can either transition from the first state to the second state based on the timing of the transition, or it can determine whether to transition from the first state to the second state at all. In other words, the terminal device may choose not to perform a state transition.

[0185] Based on first-time information, state transitions can refer to either the terminal device directly performing a state transition based on that information, or the network device sending a transition instruction based on the first-time information, with the terminal device then performing the state transition according to the instruction. As mentioned earlier, first-time information can indicate the period during which the terminal device is unreachable. Both network-device-centric and terminal-device-centric processes can be used to identify and coordinate periods during which the terminal device is unreachable. These two approaches are not mutually exclusive; they can serve different use cases and coexist within the same network. The following sections will describe implementation examples of state transition methods centered on the terminal device and network device, respectively.

[0186] In some embodiments, when the first state is an RRC idle state or a PSM state, the first time information can be used by the terminal device to determine whether to establish a connection. As an example, the first time information also includes a third time period during which the first serving cell provides services to the terminal device, the duration of which is used by the terminal device to determine whether to establish an RRC connection with the first serving cell.

[0187] For example, when the first serving cell is the cell currently providing service to the first satellite, the third time period represents the remaining duration for which the first satellite can provide service to the terminal device. If this remaining duration is insufficient to establish a connection, the terminal device may choose not to establish a connection with the first satellite. If the remaining duration is sufficient to establish a connection, the terminal device may establish an RRC connection with the first satellite if there is a service requirement to ensure communication.

[0188] For example, the first serving cell can be the cell that provides service to the terminal device when it switches to another satellite. Similarly, the third time period can also represent the remaining duration of service provided by other satellites to the terminal device, which will not be elaborated further here.

[0189] As an example, when the terminal device does not handover before reaching the edge of the current serving cell, the third time period is the first time period.

[0190] As an example, when the duration of the third time period is less than or equal to the first threshold, the terminal device does not establish an RRC connection in order to avoid connection failure and reduce power consumption caused by establishing a connection.

[0191] During state transitions centered on the terminal device, the terminal device can determine the first-time information related to the lack of network coverage based on various pieces of information and send this information to the network device. While the network device may have more accurate coverage data than the terminal device, it typically cannot know its location as accurately as the terminal device. Furthermore, in some cases in NB-IoT (e.g., eNB), the terminal device may not send a location report to the network device, meaning the terminal device's estimate of being in a state of no network coverage may be more accurate than the network device's estimate. Moreover, if the terminal device anticipates the first-time information, even if it loses signal in an RRC connected state, it can avoid the power-intensive RLF declaration process because it knows it is about to enter a state of no network coverage.

[0192] In some embodiments, after the terminal device determines the first time information, it can send the first time information to the network device. Upon receiving the first time information, the network device can send first indication information to the terminal device. The first indication information can indicate whether the terminal device should transition from a first state to a second state, or it can indicate the timing of the state transition performed by the terminal device.

[0193] As an example, the first indication information includes the timing of the transition from the RRC active state to the RRC idle state of the terminal device. For example, the first indication information can indicate the timing of the transition by configuring a transition timer for the terminal device to avoid the terminal device making an automatic transition.

[0194] As an example, the terminal device notifies the network device of periods when it is unreachable and / or indications of leaving or entering the coverage area (first-time information). Further, when the terminal device is in an RRC-connected (RRC_CONNECTED) state, either the network device or the terminal device can be configured to report this indication via a first timer. This first timer could be, for example, an out-of-coverage timer.

[0195] For example, the value of the first timer can be configured by the network device or by the terminal device itself.

[0196] For example, when the value of the first timer is configured to zero, the terminal device can immediately release the RRC connection and enter the RRC idle state.

[0197] For example, the configuration or transmission information of the first-time information can introduce new indications from uplink dedicated control channel (UL DCCH) messages, or it can use the existing ASRAI.

[0198] As an example, when a terminal device sends first-time information to a network device, the terminal device can start a first timer.

[0199] As an example, once the network device receives the first time information, it can also start the first timer.

[0200] As an example, after predicting when discontinuous coverage will begin, the terminal device can send a first-time information message to the network device. Either the terminal device or the network device can start a first timer. When the first timer expires, the terminal device can, based on the network device's behavior, perform an action to leave the RRC connection and enter the RRC idle state. The reason for releasing the RRC connection can be marked as "other".

[0201] For example, when the first timer runs, the terminal device can send first-time information to the network device. The network device continues to provide service to the terminal device until it leaves the first satellite service area. Any uplink / downlink transmissions between the terminal device and the network device can continue. Additionally, during this period, the network device can choose to reconfigure the terminal device to disable or stop the first timer.

[0202] In some embodiments, the terminal device may also autonomously enter the RRC idle state. Optionally, the terminal device may determine the timing of the state transition based on a first timer, rather than determining the timing based on an instruction from the network device.

[0203] As an example, a first timer can be set on the terminal device. The terminal device can start the first timer when sending the first time information. When the first timer expires, the terminal device autonomously performs the action of leaving the RRC connection and enters the RRC idle state. The reason for RRC release can also be marked as "other".

[0204] As an example, when a terminal device releases an RRC connection based on the first timer, the RRC release reason can be marked as a new reason. When entering a scenario with no network coverage, the network device can send an RRC release (RRCRelease) message to the terminal device with the new reason.

[0205] As an example, the first timer can be used by the terminal device to determine when to transition from the RRC active state to the RRC idle state.

[0206] As an example, the terminal device can also send a second indication message to the network device. This second indication message can indicate that the RRC idle state is the preferred state. The second indication message can also be used by the terminal device to determine the timing of the transition from the RRC active state to the RRC idle state based on a first timer. When the first timer expires, the terminal device can transition from the RRC active state to the RRC idle state. That is, if the first timer expires, the terminal device can directly perform the state transition regardless of whether it has received the first indication message from the network device.

[0207] As an example, since the terminal device is aware of its own coverage, it can indicate "RRC_IDLE" as the preferred RRC state to the network when the first timer is started. If no RRC release instruction is received when the first timer expires, the terminal device will automatically enter RRC_IDLE.

[0208] Whether the transition timing is determined by network device instructions or by the terminal device itself, the transition timing is related to one or more of the following information: the terminal device's service type, the terminal device's service priority, and the network device's downlink data. The following sections will provide a detailed explanation of the state transition process centered on the network device.

[0209] In some embodiments, when a terminal device determines that it is about to enter a scenario with no network coverage, the first-time information can also instruct the terminal device to leave the RRC connection. The network device can then determine, based on this information, that it is time to release the terminal device. Releasing the terminal device means transitioning it from an RRC active state to an RRC idle state.

[0210] As an example, network devices can prevent terminal devices from voluntarily entering an idle state by releasing timer configurations if they deem it necessary.

[0211] In some embodiments, the terminal device can autonomously release the existing RRC connection when it anticipates the arrival of an uncovered gap. If the terminal device does not have enough time to complete the RRC re-establishment process due to discontinuous coverage, it can determine when to transition to the RRC idle state based on the triggering of an RLF. For example, if the actual time the terminal device enters a network-free environment is earlier than the time indicated by the first time information, the terminal device may enter a network-free environment prematurely. In this scenario, the terminal device may not be aware that it has entered a network-free environment and may initiate an RRC re-establishment request due to signal loss, thus triggering an RLF.

[0212] As an example, the terminal device can directly transition to the RRC idle state after triggering the RLF. That is, when the terminal device anticipates entering a scenario without network coverage, it will immediately release the RRC connection with the network (NW) once the RLF is triggered.

[0213] As an example, the terminal device transitions to the RRC idle state after the number of times the RLF is triggered exceeds a threshold. For instance, after the RLF is triggered N times, the terminal device transitions from the RRC active state to the RRC idle state. Here, N is a natural number greater than or equal to 1.

[0214] In some embodiments, to avoid mismatches in RRC connection states, the terminal device may trigger a request to release the RRC connection before the actual RLF event. By triggering this request, the terminal device can notify the network of the RRC connection release. This approach may result in the RRC connection being released earlier than the actual RLF event, thus affecting data transmission. To avoid premature release, the terminal device can implicitly release the connection on the RLF, i.e., release the RRC connection when the RLF is triggered. However, the network should be aware of the terminal device's behavior so that it can determine the locally released UE context based on the data transmission state and the latest reported radio conditions.

[0215] In some embodiments, when the terminal device knows that no network coverage is about to begin and the remaining time in the current cell is insufficient to complete the new connection establishment process, the decision on whether to trigger re-establishment or enter the RRC idle state can also be made based on the implementation of the terminal device.

[0216] The previous section introduced the state transition process centered on the terminal device. The following section describes the state transition process centered on the network device. In this process, the network device can detect the activity level of the terminal device's services to determine when to initiate a state transition. It should be understood that the terminal device can also determine the state transition timing itself based on the service type, which will not be elaborated upon here.

[0217] In some embodiments, the network device may be any of the base stations described above or network-side devices other than the communication equipment corresponding to the core network. For example, when the base station is located on a satellite, the network device may refer to the satellite. For example, when the base station is located on the ground and the satellite is only used for relay, the network device may include both the satellite and the base station.

[0218] As an example, the network equipment includes a first satellite, and the terminal equipment is located within the service area of ​​the first satellite at the current moment.

[0219] During the network device-centric transition process, the terminal device maintains an RRC connection with the network device. The network device can understand the terminal device's service status based on communication with it, thereby instructing the terminal device to transition accordingly. Furthermore, the terminal device also sends real-time information to the network device to minimize potential state mismatches between the two.

[0220] In some embodiments, the network device may also determine the first-time information by detecting the service activity level of the terminal device. That is, the network device can receive the first-time information sent by the terminal device, or it can determine the first-time information itself. Based on the first-time information, the network device can instruct the terminal device to perform a transition from a first state to a second state.

[0221] In some embodiments, when a terminal device notifies the network device of the first moment it leaves the coverage area, the network device can determine whether to immediately allow the terminal device to release the RRC connection and enter the RRC idle state. In other words, the network device can determine the timing of the transition.

[0222] As mentioned above, the timing of the transition may be related to the service type and priority of the terminal device, as well as the downlink data of the network device.

[0223] As an example, a network device can set an activity factor function related to the service type and / or service priority of the terminal device to determine the transition timing. Exemplarily, the network device can detect the activity level of the terminal device's service and configure the transition timing for DRX-enabled terminal devices. Exemplarily, the activity factor function can be a first factor δ(x,y). Here, x can be related to the service type, y can be related to the service priority, and 0 < δ(x,y) ≤ 1.

[0224] As an example, network devices can configure switching timing based on downlink data transmission needs to avoid downlink data loss. For instance, to prevent downlink data loss, the network device can instruct the terminal device to enter the RRC idle state in advance. Since the network device knows when the terminal device will enter the idle state, if the network device still has downlink data to transmit, it can store and buffer the downlink data, and then transmit this data when the terminal device reconnects. The terminal device reconnects for example, when new satellites provide coverage, when the terminal device switches to another satellite, or when the terminal device receives a wake-up signal.

[0225] For example, the fourth time period between the transition timing and the current time is the product of the first time period and the second factor, where the second factor is greater than 0 and less than 1. The second factor is, for example, α. When the first time period is the first duration, the first time period can be represented as T1. The network device can instruct the terminal device to enter the RRC idle state after the time period α*T1 (1>α>0).

[0226] Depend on Figure 7 It is known that after predicting the initial information, the terminal device can autonomously or according to the instructions of the network device to perform a state transition. Typically, when the terminal device is in connected mode, it will know about the coverage discontinuity, so it can decide to release the RRC connection instead of triggering a re-establishment process, thereby reducing power consumption.

[0227] As mentioned earlier, before leaving the service area of ​​the first satellite, the terminal device may receive ephemeris information and / or beam information from other satellites. The terminal device can then determine whether to perform a satellite handover. Satellite handover can delay the time when the terminal device enters a state without network coverage. Furthermore, the terminal device can perform a state transition after performing a satellite handover. As an example, the terminal device can determine whether to perform a satellite handover or a state transition based on the first and second durations described above.

[0228] In some embodiments, the terminal device can determine the timing of performing a state transition based on relevant information from multiple satellites. The relevant information from the multiple satellites can be used to determine a first duration and a second duration. For ease of understanding, the following describes... Figure 8 An exemplary description is provided of the process by which a terminal device performs a state transition based on a first duration and a second duration. This process includes multiple steps.

[0229] In step S1, the network device can broadcast the ephemeris and beam information of the first satellite.

[0230] In step S2, the terminal device predicts the first duration of its departure from the first satellite based on its own location information and broadcast information.

[0231] Step S3: The first satellite notifies one or more surrounding satellites of its ephemeris parameters via RRC proprietary signaling based on a first duration.

[0232] In step S4, the terminal device predicts multiple durations from the current time to the coverage start time of one or more satellites based on the received ephemeris parameters of these satellites. The minimum value among the multiple durations is the second duration. The satellite corresponding to the second duration is the second satellite. Furthermore, the terminal device can also predict the time when the coverage of one or more satellites leaves it to determine the duration of the first time period and the second time period.

[0233] In step S5, the terminal device can determine how to deal with the scenario without network coverage based on the relationship between the first duration and the second duration.

[0234] For example, when the first duration is greater than or equal to the second duration, the terminal device performs a switch from the first satellite to the second satellite corresponding to the second duration according to the first condition; when the first duration is less than the second duration, the terminal device switches from the RRC active state to the RRC idle state.

[0235] As an example, the first condition relates to the handover conditions for the terminal device to perform satellite handover and / or the service requirements of the terminal device. The handover conditions for performing satellite handover include factors that affect the handover, such as signal measurement results.

[0236] As an example, if the first duration is greater than or equal to the second duration, the terminal device can switch from the first satellite (source satellite) to the second satellite (target satellite) if the handover conditions are met. After the satellite handover is successful, the terminal device can choose whether to enter the RRC idle state within the service area of ​​the second satellite, based on the current service status.

[0237] As an example, if the first duration is greater than or equal to the second duration and the handover conditions are not met, the first satellite can send a handover command to the terminal device to reduce the power consumption of the terminal device caused by continuously performing measurements and sending measurement reports. The terminal device can determine whether to perform a handover from the first satellite to the second satellite based on the first condition.

[0238] For example, the first condition could be whether the terminal device has a service requirement. If the terminal device has a service requirement, it performs a handover from the first satellite to the second satellite. If the terminal device does not have a service requirement, it can transition from the RRC active state to the RRC idle state. For instance, the terminal device can instruct the network device to leave the RRC connection, causing the network device to believe that the terminal device can be released. Similarly, if the network requires it, a timer configuration can be released to prevent the terminal device from voluntarily entering the idle state.

[0239] As an example, if the first duration is shorter than the second duration, the terminal device can autonomously or according to the network device's instruction to transition from the RRC active state to the RRC idle state. When the terminal device leaves or is about to leave the coverage of the first satellite, it can send a first-time information to the network device based on prediction. This information helps the network device to utilize resources effectively. If the network device does not expect the terminal device to transmit further uplink or downlink data, it will release the terminal device into the RRC idle state.

[0240] Figure 8 The method is executed by the terminal device. In step S810, the terminal device determines the first duration and the second duration.

[0241] In step S820, it is determined whether the first duration is less than the second duration. If so, proceed to step S830; otherwise, proceed to step S840.

[0242] In step S830, the device transitions from the RRC active state to the RRC idle state. The terminal device can execute this autonomously or according to instructions.

[0243] In step S840, satellite handover is performed according to the first condition.

[0244] The above text combined Figure 7 and Figure 8 This paper introduces method implementation examples for addressing discontinuous coverage, focusing on both terminal devices and network devices. Through these methods, terminal devices can determine the timing for releasing RRC connections or being woken up based on first-time information to match periods without network coverage, thereby saving power or ensuring a high success rate for communication establishment in cases of discontinuous coverage.

[0245] As mentioned earlier, the coverage status of terminal devices is typically known only to the terminal devices themselves and the access network; the core network may not be aware of this information. However, in IoT or MTC applications, the core network needs to configure the terminal devices' DRX / eDRX cycles and PSM states during idle periods. Therefore, in scenarios with discontinuous coverage, how to reasonably match the coverage status of terminal devices with the core network configuration is also a problem that needs to be considered.

[0246] To address the aforementioned issues, this application proposes another method for wireless communication. Through this method, the first time information determined by the terminal device can be used by the core network to determine first configuration parameters, which instruct the terminal device to perform state transitions. Therefore, the core network considers time information related to periods without network coverage during configuration, thereby enabling the configuration of a more reasonable energy-saving mode.

[0247] To facilitate understanding, the following will be combined with... Figure 9 Another method for wireless communication according to an embodiment of this application will be specifically described. Figure 9 The method shown is the same as Figure 7 The method association shown is for simplicity. Figure 7 The explanations of the terminology used in this study will not be repeated here.

[0248] Figure 9 This is written from the perspective of the interaction between terminal equipment, network equipment, and the core network. The terminal equipment is currently located within the service area of ​​the first satellite in the NTN. The communication equipment corresponding to the core network can be network elements or entities within the core network.

[0249] For example, the communication equipment corresponding to the core network may include an MME or an AMF. The AMF / MME can determine the configuration parameters of modes such as DRX, eDRX, or PSM when the terminal device is in an unreachable state.

[0250] For example, when base stations are deployed on satellites, the ground equipment only includes the core network. In this scenario, the PLMN is the core network.

[0251] See Figure 9 In step S910, the terminal device sends first time information. This first time information is... Figure 7 The first time information determined by the terminal device. The first time information is related to the first time period and / or the second time period, which will not be elaborated here. It should be understood that the second time period can be the duration of a period of no network coverage or unavailability, or it can represent the duration of the terminal device being unreachable.

[0252] Depend on Figure 9 It is known that the terminal device sends the first-time information to the network device. In step S920, the network device forwards the first-time information to the core network. Regardless of whether the base station is deployed on the first satellite, the network device includes the first satellite that receives the first-time information.

[0253] In some embodiments, the base station is deployed on a first satellite, and the core network is deployed on the ground. The terminal device sends first-time information to the base station on the first satellite, and the base station forwards the first-time information to the core network on the ground.

[0254] In some embodiments, both the base station and the core network are located on the ground. The terminal device sends first time information to a first satellite, which then forwards the first time information to the ground-based base station or core network. The communication equipment corresponding to the core network communicates with the terminal device through the first satellite.

[0255] As an example, once the terminal device predicts and estimates the first time information, it can report the time parameters for the first time period and the second time period. Upon receiving this, the network device can send it to the AMF / MME via a NAS message.

[0256] As an example, network devices can also estimate and predict the terminal device's first-time information based on the terminal device's location information and information from other nearby satellites.

[0257] In step S925, the core network determines the first configuration parameters.

[0258] In some embodiments, the first time information is used by the core network to determine the first configuration parameters of the terminal device. That is, the core network can determine the configuration parameters of the terminal device, i.e., the first configuration parameters, based on the first time information. When the core network configures the parameters of the eDRX configuration and / or PSM configuration for the terminal device based on the first time information, it can ensure that the terminal device is woken up when it is within satellite signal coverage, thereby successfully receiving signals from the satellite. As an example, when the MME provides a timer (e.g., a periodic TAU timer, eDRX mode, and PSM mode configuration) to the terminal device, the duration of the unavailable period (no network coverage or the terminal device being unreachable) and the start time of the unavailable period related to the first time information can be considered.

[0259] As an example, the core network can set a buffer timer based on the second time period in the first time information. For instance, after receiving the first time information, the PLMN can set a corresponding timer T2 based on the predicted and estimated second time period of the terminal device. During timer T2, if the terminal device needs to be paged, the PLMN will store the information. After the second time period has passed, the PLMN will then send its buffered data to the NTN network, and the NTN network will forward the corresponding information to the terminal device.

[0260] As an example, the duration of the buffer timer is set to be greater than one or more DRX cycles or eDRX cycles to prevent network devices from paging terminal devices when they are outside the coverage area of ​​the satellite, thus avoiding a waste of resources.

[0261] As an example, the core network can determine the first mode of the terminal device. The configuration parameters of the first mode are the first configuration parameters.

[0262] In some embodiments, the first mode is any one or more energy-saving modes configured by the core network for terminal devices, so as to perform reasonable energy-saving configuration in the case of discontinuous network coverage and save power consumption of terminal devices.

[0263] The first mode may include one or more of the following: DRX mode, eDRX mode, and PSM mode. As an example, the first mode may be any one of the three modes mentioned above. As an example, the first mode may include all three modes or any two of the three modes mentioned above. For example, in the Internet of Things (IoT), the first mode includes eDRX mode and PSM mode.

[0264] In some embodiments, the first mode can be determined based on a suggestion from the terminal device. For example, the terminal device may indicate its recommended mode in the first time information, or it may carry parameter information of the recommended mode, i.e., the first recommendation parameter, in the first time information. For example, the terminal device may send the first recommendation parameter after sending the first time information.

[0265] As an example, when a terminal device is in a communication scenario with discontinuous satellite signal coverage, it can determine the appropriate DRX mode, eDRX mode, and / or PSM mode based on the first-time information. For instance, if the second time period is relatively short, meaning the time without satellite coverage is relatively short, the terminal device is suitable for DRX mode. Conversely, if the second time period is relatively long, meaning the time without satellite coverage is relatively long, the terminal device is suitable for eDRX mode. And if the second time period is also quite long, the terminal device is suitable for PSM mode.

[0266] As an example, terminal devices can also determine the appropriate DRX mode, eDRX mode, and / or PSM mode based on the service type. For instance, DRX mode is suitable when the terminal device's service type requires frequent data transmission. Conversely, PSM mode is suitable when the terminal device's service type requires longer data transmission intervals.

[0267] In some embodiments, the first configuration parameter can also be determined based on the recommended parameters of the terminal device. For example, the PLMN network can determine the first configuration parameter based on the first recommended parameters of the terminal device. Therefore, the terminal device and the core network can negotiate suitable configuration parameters (e.g., timer length) for relevant PSM / eDRX schemes even with discontinuous network coverage.

[0268] For example, in the case of discontinuous coverage in NTN, it is necessary to address the misalignment between PTW and coverage window. The NAS layer between the terminal device and the core network can negotiate relevant parameters to support discontinuous coverage. For example, the terminal device and the core network can negotiate the configuration of various timers to ensure mobility management functions and energy-saving optimization of the terminal device.

[0269] As an example, terminal devices can report the recommended DRX, eDRX, PSM, etc., to the core network based on their service type, and can negotiate with the AMF / MME to support discontinuous coverage. The MME can consider this recommendation when providing timers to terminal devices. For example, the AMF / MME can configure variable period or TAU timers, DRX, eDRX, and PSM modes for terminal devices.

[0270] As an example, the terminal device can determine the first recommended parameters based on real-time information and service type. The terminal device can forward these first recommended parameters to the core network via network devices, allowing the core network to determine the first configuration parameters. When the core network determines the first configuration parameters based on the first recommended parameters, it helps ensure good communication quality for the terminal device when communicating in scenarios with discontinuous satellite signal coverage using modes such as eDRX and PSM, and further reduces the power consumption of the terminal device.

[0271] As an example, the first recommended parameters include TAU, eDRX, PSM, and other related parameters recommended by the terminal device.

[0272] As an example, the terminal device can send the determined DRX, eDRX, and / or PSM configuration parameters suitable for communication scenarios with discontinuous satellite signal coverage as reporting information to the core network. The core network can then refer to the DRX, eDRX, and / or PSM configuration parameters recommended by the terminal device to configure the terminal device with DRX, eDRX, and / or PSM configurations that match the communication scenario.

[0273] As an example, when a terminal device determines that the applicable mode is DRX mode, it can determine the recommended parameters for the DRX configuration suitable for that communication scenario. The first recommended parameters may include the recommended parameters for the DRX configuration, such as the TAU time parameters and timer parameters.

[0274] As an example, when a terminal device determines that the applicable mode is eDRX, it can determine recommended parameters for the eDRX configuration suitable for that communication scenario. The first recommended parameter may include recommended parameters for the eDRX configuration, such as the eDRX period.

[0275] As an example, when a terminal device determines that the applicable mode is PSM mode, it can determine recommended parameters for the PSM configuration suitable for that communication scenario. The first recommended parameters may include recommended parameters for the PSM configuration, such as the PSM duration. As an embodiment, the terminal device may suggest directly entering PSM state in this communication scenario.

[0276] As an example, when the communication scenario determined by the terminal is applicable to both eDRX mode and PSM mode, recommended parameters for the eDRX and PSM configurations suitable for that communication scenario can be determined. The first recommended parameters may include these parameters.

[0277] In some embodiments, the first mode can also be determined based on the capabilities of the terminal device. As mentioned above, the core network can determine the corresponding first mode based on the capabilities supported by the terminal device, which will not be elaborated further here.

[0278] In some embodiments, the first mode can be determined based on information obtained by arbitrarily combining the above-mentioned various information.

[0279] In some embodiments, the first configuration parameters may include any one or more parameters related to the first mode, without limitation herein. For example, the first configuration parameters may include new TAU, eDRX, DRX, and PSM timer parameters. For example, the first configuration parameters may include parameters such as the period, start time, offset value, and duration of the first mode, as well as timer configuration parameters. For example, the first configuration parameters may be used by the terminal device to execute the first mode.

[0280] As an example, the first configuration parameter may include the time parameters of a second timer and a third timer. The second timer is used to determine the duration the terminal device is in the Radio Resource Control (RRC) idle state. The second timer is, for example, a T3324 timer. The third timer is used to determine the duration the terminal device is in the PSM state. The third timer is, for example, a T3412 timer. The start time of the second and third timers can be the end time of the first time period. That is, both timers start when the first time period ends. Therefore, the duration of the third timer is longer than the duration of the second timer. For example, the duration of the third timer is the sum of the duration of the second timer and the duration of the PSM state.

[0281] As an example, the setting of the second timer can be determined based on the first time period. For instance, the start time of the second timer can be the end time of the first time period (the start time of the second time period). Alternatively, the duration of the second timer can be dynamically adjusted based on the duration of the first time period to ensure that the device matches unreachable times and sleep states when NTN coverage is unavailable.

[0282] For example, the second timer starts counting from the end of the first time period. When the second timer expires, the terminal device immediately enters the PSM state.

[0283] As an example, when a terminal device directly enters a scenario without network coverage while in RRC active state, the duration of the second timer can be adaptively increased, which helps to match the existing energy-saving configuration with the scenario without network coverage.

[0284] As an example, the duration of the third timer can be determined based on the second time period to ensure that the end time of the PSM state matches the end time of no network coverage or device unreachability, thereby preventing the terminal device from being woken up when there is no network coverage. The second time period can refer to the entire time period during which the terminal device predicts and estimates it will be unable to be covered by the network.

[0285] As an example, the end time of the third timer is no earlier than the end time of the second time period. That is, the end time of the third timer can be equal to or later than the end time of the second time period. When the end time of the third timer is the end time of the second time period, the end time of the PSM state can be the point where the device is unreachable or has no network coverage. When the end time of the third timer is later than the end time of the second time period, the end time of the PSM state can be the same as the original end point.

[0286] As an example, when the end time of the second time period is later than the start time of a TAU cycle, the terminal device remains in PSM state throughout that TAU ​​cycle.

[0287] In some embodiments, the network device may receive first time information from the terminal device. When the first time information indicates a first time period, the network device may instruct the terminal device to enter the RRC idle state after the duration of the first time period has elapsed. Alternatively, the terminal device may autonomously enter the RRC idle state based on the predicted duration of the first time period. Although the terminal device enters the RRC idle state, it may not receive paging messages because the network coverage is lost after the first time period. In this scenario, the duration of the second timer can be reduced to allow the terminal device to quickly enter the PSM state. Increasing the duration of the PSM state further saves power.

[0288] As an example, when the second timer is a T3324 timer and the third timer is a T3412 timer, the ratio of the duration of the second timer to the duration of the third timer is less than the first parameter. The first parameter can be A, where 0 < A < 0.5. For example, A is 0.25.

[0289] For ease of understanding, the following will use... Figure 5 Taking the T3324 and T3412 timers as examples, combined with... Figure 10 The two examples provided illustrate the configuration parameters for timers. The T3324 timer represents the second timer, and the T3412 timer represents the third timer. It should be noted that this is only an example; the second and third timers could also be other timers used to determine their respective durations.

[0290] See Figure 10 T1 represents the first time period, and T2 represents the second time period. Compared to Figure 5 In Examples 1 and 2, the start times of both timers T3324 and T3412 are advanced to the end time of the first time period. Since the terminal device is in the RRC active state at the end time of the first time period, the start times of both timers are advanced from the original idle state start time to the active state period.

[0291] Comparing Example 1 and Example 2, it can be seen that the duration of the T3324 timer in Example 1 is much longer than that in Example 2. Therefore, Example 2 can achieve further power saving.

[0292] exist Figure 10 In this context, the end time of timer T3412 is the end time of the second time period. It should be noted that the end time of timer T3412 can also be... Figure 10 The original end point of the first image in the middle.

[0293] In some embodiments, when the first mode is eDRX mode, the first configuration parameter may include configuration parameters for the eDRX mode. As an example, the first configuration parameter may determine the PTW time parameter within each eDRX cycle. The PTW time parameter may also be replaced by the actual PTW window. The terminal device or network device can calculate the PTW calculation window based on the cycle information sent by the core network, and then adjust the calculation window to determine the actual PTW window.

[0294] As an example, the PTW timing parameters can be determined based on the PTW calculation window and initial time information. The PTW calculation window refers to the time window determined according to the calculation formulas for PH, PTW_start, and PTW_end mentioned earlier. In general, the eDRX period may overlap with the second time period, and the positions of PH and PTW_start may be earlier than the end time of the second time period. If PH and PTW_start are determined solely based on existing calculations, the terminal device may begin monitoring PTW during periods without network coverage, resulting in unnecessary power consumption. To address this issue, when the PTW calculation window overlaps with the second time period, the actual PTW window can be determined through adjustments.

[0295] As an example, the first configuration parameter may include various parameters used to adjust the PTW calculation window.

[0296] As an example, if the calculation window of the PTW begins within the second time period, the terminal device skips the PTW or a portion of the PO within the PTW. Skipping the PTW or PO means that the terminal device does not detect paging on that PTW or PO.

[0297] As an example, if the calculation window of the PTW begins within the second time period, the network device skips the PTW or a portion of the PO within the PTW. Skipping a PTW or PO means that the network device does not page the terminal device on that PTW or PO.

[0298] For example, if the calculated start positions of PH and PTW are within the second time period, the terminal device (and the network) can skip PH and PTW, or at least skip some POs during the overlapping duration of the second time period and PTW. Given that the maximum PTW length is only 4 superframes (for NB-IoT), once the terminal device skips some or all of the POs in the current PTW and the remaining paging fails to be sent to the terminal device, it waits for the next eDRX cycle of PTW.

[0299] As an example, when the start position of the PTW's calculation window is within the second time period, the actual start position of the PTW window is the sum of the start position of the calculation window and a first offset value. The first offset value can be determined based on the duration of the overlapping time period. That is, when the PTW in the eDRX cycle partially overlaps with the second time period, the start position of the PTW (PTW_start) is adjusted so that the start position of the PTW in the eDRX cycle is aligned with or after the end time of the period without network coverage.

[0300] The following is combined with Figure 11 An example is provided. Here, T2 represents the second time period. Figure 11 In this process, the terminal device and the core network can calculate the PTW and the offset L (first offset value) between the PTW_start and the end time of the second time period. The terminal device can predict the duration of the second time period, as well as the eDRX period, the location of the paging superframe, and the relevant parameters of the PTW.

[0301] like Figure 11 As shown, the starting position PTW_start of the PTW calculation window for the next eDRX cycle is delayed by an offset L. L may be greater than the paging superframe. That is, the starting position of the actual PTW window is the position after offsetting L from the starting position of the calculated window. Through this adjustment, within this eDRX cycle, the PTW is entirely within network coverage time, without wasting resources initiating paging of unreachable terminal devices, and the terminal devices will not lose important paging information. Therefore, the starting position PTW_start′ of the actual PTW window can be expressed as:

[0302] PTW_start′=PTW_start+L.

[0303] For example, the terminal device can adjust the relevant parameters of PTW in each eDRX cycle, that is, the relevant parameters of PTW can change dynamically in each eDRX cycle.

[0304] As an example, when the end position of the PTW's calculation window is within the second time period, the actual end position of the PTW window is the difference between the end position of the calculation window and the second offset value. The second offset value can be determined based on the duration of the overlapping time period. That is, when the PTW in the eDRX cycle partially overlaps with the second time period, the end position of the PTW (PTW_end) is adjusted so that the end position of the PTW in the eDRX cycle is aligned with the start time of the area without network coverage or before the start time.

[0305] The following is combined with Figure 12 For example, T1 represents the first time period, and T2 represents the second time period. Figure 12 In this context, when a terminal device needs to enter the RRC idle state autonomously or upon notification from a network device, it sends a first-time information message. As mentioned earlier, the terminal device can predict the time it will leave network coverage using the ephemeris parameters sent by the network device and its own location information. Furthermore, after obtaining the ephemeris parameters of other surrounding satellites from the first satellite, the terminal device can predict the time it will be covered by other satellites again, thus estimating the period of time without network coverage, i.e., the second time period. After calculating PTW and PTW_start, the terminal device and the core network can combine the relevant parameters of eDRX and the duration of the second time period to adjust PTW_end within the eDRX cycle.

[0306] like Figure 12 As shown, the terminal device estimates that it will enter a period of no network coverage (the second time period) after a duration of T1. Within the first eDRX cycle, the second time period partially overlaps with the duration of PTW. The terminal device can determine the overlapping duration t (the second offset value) using PTW-related parameters, thereby adjusting PTW_end. Therefore, the end position of the actual PTW window, PTW_end′, can be expressed as:

[0307] PTW_end′=PTW_end-t.

[0308] Depend on Figure 12 It can be seen that, due to the adjustment of the end position of PTW, the duration of the calculation window PTW1 and the actual window PTW2 are different.

[0309] As an example, when the calculation window of PTW within the eDRX cycle overlaps with the H-SFN at the end of the second time period, the terminal device can use offset_PH to adjust PH to align it with the H-SFN at the end of the second time period.

[0310] It should be noted that although the second time period is a terminal device-specific parameter, the end times of the second time period for multiple terminal devices may be very close. Therefore, in order to assign PTW_start to different terminal devices (e.g., to assign pending paging during coverage recovery), the core network may still need to configure different specific offsets for different terminal devices.

[0311] As an example, when the second time period overlaps with the PTW calculation windows of two adjacent eDRX cycles, the actual end position of the PTW window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the PTW window in the second eDRX cycle is no earlier than the end time of the second time period. Considering that the granularity of the second time period may be relatively large (e.g., minutes or hours), the second time period may overlap with the PTW of two adjacent eDRX cycles.

[0312] The following is combined with Figure 13 An example is provided. Figure 11 and Figure 12 The explanations of the terms used in this article will not be repeated here. For example... Figure 13 As shown, T2 partially overlaps with the PTW of both eDRX cycles. The overlap duration between the PTW in the first eDRX cycle and the second time period is t, and the offset between PTW_start and the end time of the second time period in the second eDRX cycle is L. Since the adjustment of PTW_start or PTW_end occurs within its corresponding eDRX cycle, Figure 13 PTW_start and PTW_end have been adjusted to prevent terminal devices from performing paging detection during periods of no network coverage, thus saving power.

[0313] In some embodiments, the first configuration parameter may include the eDRX period. The eDRX period can be dynamically adjusted according to the duration of the second time period. As mentioned above, discontinuous coverage may occur periodically. The eDRX period configured in the core network may be similar to the period when the network is not covered. Therefore, during periods without network coverage, the terminal device is likely to miss the PTW or a portion of the PTW each time, thus affecting paging performance. To solve this problem, the eDRX period can be dynamically configured and consistent with the duration of the second time period. Optionally, the eDRX period can be dynamically configured according to the length of the second time period.

[0314] As an example, the eDRX period is proportional to the length of the second time period. If the second time period is long, the eDRX period can be configured to be longer accordingly; if the second time period is short, the eDRX period can be configured to be shorter accordingly.

[0315] See also Figure 9 In step S930, the core network sends the first configuration parameters to the network devices. In step S940, the terminal devices receive the first configuration parameters forwarded by the network devices.

[0316] The first configuration parameter can be used by the terminal device to perform state transitions. In some embodiments, the state transitions performed by the terminal device may include transitions between any two of the following three states: RRC active state, RRC idle state, and PSM state.

[0317] Depend on Figure 9 It is understood that the core network can determine the first configuration parameters based on the first-time information and / or the first recommended parameters of the terminal device, thereby minimizing the need for the terminal device to perform paging detection during periods of no network coverage, and also minimizing the need for the network device to page the terminal device during periods when the terminal device is unreachable, in order to save power consumption of the terminal device and the network device.

[0318] As mentioned earlier, the initial information can be determined based on relevant information from multiple satellites associated with the terminal device. Furthermore, this information can be carried within one or more of the following: SIB3, SIB31, and SIB32. Based on SIB3, SIB31, and SIB32, the terminal device can estimate whether the remaining coverage time of the cell or satellite is short.

[0319] In some embodiments, SIB32 may contain auxiliary information for up to four satellites. Due to the mobility and service characteristics of the terminal device, some information in SIB32 may not be relevant to the terminal device. For example, SIB32 may notify that a satellite will arrive within the next 6 hours, but the terminal device does not expect to transmit data within 8 hours. In this case, the terminal device can request information about expected coverage availability after 8 hours, and the network device can provide this satellite auxiliary information in a dedicated RRC.

[0320] In some embodiments, when the satellite information in SIB32 is irrelevant to the terminal device, the terminal device may request the network device to provide satellite assistance information. This satellite assistance information includes information about satellites not currently included in the SIB.

[0321] As an example, a terminal device can request satellite assistance information via a dedicated RRC network. This dedicated RRC can include satellites that are not currently part of SIB32 or other SIBs.

[0322] In some embodiments, the terminal device can receive SIBs broadcast by different PLMNs. These broadcast SIBs may include SIB3, SIB31, and SIB32, etc. For example, in an NTN system with discontinuous coverage, the terminal device can obtain temporary parameters and coverage parameters from currently or previously received SystemInformationBlockType32, SystemInformationBlockType31, or SystemInformationBlockType3. Based on the temporary parameters, the terminal device can determine whether it is outside radio signal coverage. That is, the terminal device can determine whether it is currently in a scenario without network coverage. If the terminal device is in a scenario without network coverage, in response, the terminal device can disable access layer functions to save power.

[0323] After the second time period, how the terminal devices should operate is also an issue that needs to be considered.

[0324] In some embodiments, after the second time period, the terminal device may receive data cached by the core network. For example, when the terminal device does not need to re-register with the PLMN network, the terminal device may receive data cached by the core network during the cache timer period.

[0325] In some embodiments, after the second time period, the terminal device may enter an automatic network selection mode. For example, when the terminal device needs to re-register with the PLMN network, the terminal device may enter an automatic network selection mode.

[0326] In some embodiments, when the terminal device is in a period of no network coverage or unreachable status, the AS layer of the terminal device has been disconnected, but the NAS layer remains connected. In some scenarios, when the terminal device is in PSM state during the second time period, although the terminal device no longer receives paging messages, it is still registered in the network. When the UE context retained by the NTN network and PLMN network is consistent with the information for the terminal device to re-establish the RRC connection, the terminal device can send and receive data without re-registering with the network after waking from sleep. That is, although the terminal device is in an unreachable state, it is still registered in the PLMN network initially selected.

[0327] In some embodiments, the UE context retained by the NTN network and the PLMN network may be inconsistent with the information used by the terminal device to re-establish the RRC connection, or the terminal device may need to reselect the PLMN network. In this scenario, the terminal device re-registers with the PLMN.

[0328] As an example, the PLMN re-registration process is as follows: The terminal device first selects the most recently registered PLMN, then selects a high-priority PLMN service, and then selects a PLMN from the list of PLMNs of the same level as the previous one (equivalent PLMN, EPLMN), and attempts to register in the selected PLMN. It should be noted that the terminal device may have its access layer disabled due to discontinuous coverage, which may delay attempts to obtain service on higher-priority PLMNs.

[0329] As an example, the terminal device can be configured to an automatic network selection mode. In the automatic network selection mode of NTN, the NB-IoT terminal device can select from the visited PLMN (VPLMN) and HPLMN / equivalent home PLMN (EHPLMN) in sequence.

[0330] As an example, an end device can register with a VPLMN and obtain services on the VPLMN.

[0331] As an example, a terminal device can start a timer based on the configured automatic network selection mode to periodically attempt to obtain service on an HPLMN or EHPLMN. When the terminal device's access layer is disabled due to discontinuous coverage in the NTN, the behavior of periodically attempting to access a higher-priority HPLMN or EHPLMN needs to be redefined.

[0332] For ease of understanding, the following example uses the PLMN as the core network of the NTN system. Figure 14 and Figure 15 An exemplary method for negotiating energy-saving configurations between terminal devices and the PLMN during periods of no network coverage is provided. The dashed lines in the figure represent one possible embodiment.

[0333] Figure 14 and Figure 15 All of these are written from the perspective of the interaction between terminal devices, NTN, and PLMN. Figure 14 In the process, the PLMN sets a timer T2 to buffer data to be sent. Figure 15 In this case, the PLMN does not have a timer set.

[0334] See Figure 14 In step S1401, the terminal device enters the automatic network selection mode.

[0335] In step S1402, the terminal device completes PLMN registration. After successfully selecting a PLMN, the terminal device completes registration and begins normal communication.

[0336] In step S1403, the NTN system broadcasts SIB3, SIB31, and SIB32.

[0337] In step S1404, the terminal device establishes a communication connection with the NTN system. The terminal device can learn about the ephemeris parameters of the current satellite covering it, as well as the ephemeris parameters of several neighboring satellites, based on the broadcast.

[0338] In step S1405, the terminal device predicts the out-of-coverage time. The out-of-coverage time information refers to the first time period and the second time period related to the first time information. The terminal device can make predictions and estimates based on its current location information or when triggered by network devices.

[0339] In step S1406, the terminal device reports the first-time information to the NTN network. The terminal device can report coverage information and send it to the NTN network via proprietary RRC signaling messages.

[0340] In step S1407, the NTN network reports the first time information to the PLMN network. Based on the first time information, the PLMN network can determine that the terminal device will leave the network coverage area after time T1.

[0341] In step S1408, the terminal device reports the first recommended parameters to the NTN network. The terminal device can report recommended parameters such as DRX, eDRX, and PSM to the core network according to its own service type, thereby negotiating with the AMF / MME to support the configuration of discontinuous coverage.

[0342] In step S1409, the NTN network reports the first recommended parameters to the PLMN network.

[0343] In step S1410, the PLMN network determines the first configuration parameter and sets timer T2. The PLMN network can update and set the information for each DRX or eDRX cycle based on the first time information and the first recommended parameters, and update timer information such as T3324 and T3412. Timer T2 is a buffered timer. The first configuration parameter may include configuration parameters such as the periodic TAU timer, DRX, eDRX, and PSM mode. For example, the AMF / MME provides timer configurations to the terminal device after comprehensive consideration.

[0344] In steps S1411 and S1412, the PLMN network sends the first configuration parameters to the NTN network, and the NTN network sends the first configuration parameters to the terminal device. The terminal device and the NTN network can calculate the PTW parameters for each eDRX cycle based on this information.

[0345] In step S1413, the terminal device enters the DRX and eDRX cycles.

[0346] In step S1414, the terminal device enters a state with no network coverage. During the first time period (T1), the terminal device will enter the RRC idle state autonomously or according to an instruction. After T1, the terminal device will enter a state with no network coverage according to a predicted time.

[0347] In step S1415, the PLMN network starts timer T2 to cache data.

[0348] In step S1416, the terminal device enters the network coverage scenario after the second time period (T2).

[0349] In step S1417, the PLMN network determines that timer T2 has expired.

[0350] In steps S1418 and S1419, the PLMN network sends cached data to the NTN network, and the NTN network forwards it to the terminal device.

[0351] and Figure 14 The difference is, Figure 15 The PLMN in the middle does not have a timer T2 set, and the terminal device re-registers with the PLMN after entering a state of no network coverage. For simplicity, Figure 14 The process explanation in Figure 15 The lieutenant general will not elaborate further.

[0352] See Figure 15 Steps S1501 to S1509 and steps S1511 to S1514 will not be described again.

[0353] In step S1510, the PLMN network only determines the first configuration parameters and does not set a timer. The first recommended parameters of the terminal device can enable the terminal device and the core network to negotiate energy-saving configurations.

[0354] In step S1515, the terminal device enters the automatic network selection mode.

[0355] The above text combined Figures 1 to 15 The method embodiments of this application are described in detail below. Figures 16 to 19 The present application provides a detailed description of the apparatus embodiments. It should be understood that the descriptions of the apparatus embodiments correspond to the descriptions of the method embodiments; therefore, any parts not described in detail can be found in the foregoing method embodiments.

[0356] Figure 16 This is a schematic block diagram of a device for wireless communication according to an embodiment of this application. The device 1600 can be any of the terminal devices described above. Figure 16 The apparatus 1600 shown includes a transmitting unit 1610 and a receiving unit 1620.

[0357] The transmitting unit 1610 can be used to transmit first time information, which is used by the core network to determine the first configuration parameters of the terminal equipment.

[0358] The receiving unit 1620 can be used to receive first configuration parameters, which are used by the terminal device to perform state transitions. The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state without network coverage, and the second time period is the duration of the state without network coverage.

[0359] Optionally, the device 1600 further includes a determining unit, which can be used to determine a first recommended parameter based on the first time information and the service type, the first recommended parameter being used by the core network to determine the first configuration parameter.

[0360] Optionally, the receiving unit 1620 is further configured to receive data cached in the core network after the second time period; or, the device 1600 may further include a first processing unit, which may be configured to enter an automatic network selection mode after the second time period.

[0361] Optionally, the first configuration parameter is a configuration parameter for a first mode of the terminal device, the first mode including one or more of the following: DRX mode, eDRX mode, and PSM mode.

[0362] Optionally, the first configuration parameters include the time parameters of the second timer and the third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period.

[0363] Optionally, the duration of the third timer is determined based on the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

[0364] Optionally, the second timer is a T3324 timer and the third timer is a T3412 timer, and the ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

[0365] Optionally, the first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameters of the paging time window within each eDRX cycle. The time parameters of the paging time window are determined based on the calculation window of the paging time window and the first time information.

[0366] Optionally, the device 1600 further includes a second processing unit, which can be used to skip the paging time window or part of the paging time window when the start position of the calculation window of the paging time window is within the second time period.

[0367] Optionally, the starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

[0368] Optionally, the end position of the calculation window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculation window and the second offset value.

[0369] Optionally, the second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

[0370] Optionally, the first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

[0371] Optionally, the terminal device is located within the service area of ​​the first satellite in the NTN at the current moment.

[0372] Optionally, the state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

[0373] Optionally, the communication equipment corresponding to the core network includes MME or AMF.

[0374] Figure 17 This is a schematic block diagram of another device for wireless communication according to an embodiment of this application. The device 1700 can be any of the network devices described above. Figure 17 The apparatus 1700 shown includes a first receiving unit 1710, a second receiving unit 1720, and a transmitting unit 1730.

[0375] The first receiving unit 1710 can be used to receive first time information, which is used by the core network to determine the first configuration parameters of the terminal device.

[0376] The second receiving unit 1720 can be used to receive the first configuration parameters, which are used by the terminal device to perform state transitions.

[0377] The sending unit 1730 can be used to send a first configuration parameter to a terminal device; wherein the first time information is related to a first time period and / or a second time period, the first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the period without network coverage.

[0378] Optionally, the first receiving unit 1710 is further configured to receive a first recommended parameter determined by the terminal device based on the first time information and the service type, the first recommended parameter being used by the core network to determine the first configuration parameter; the sending unit 1730 is further configured to send the first recommended parameter to the core network.

[0379] Optionally, the sending unit 1730 is also used to send core network cached data to the terminal device after the second time period.

[0380] Optionally, the first configuration parameter is a configuration parameter for a first mode of the terminal device, the first mode including one or more of the following: DRX mode, eDRX mode, and PSM mode.

[0381] Optionally, the first configuration parameters include the time parameters of the second timer and the third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period.

[0382] Optionally, the duration of the third timer is determined based on the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

[0383] Optionally, the second timer is a T3324 timer and the third timer is a T3412 timer, and the ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

[0384] Optionally, the first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameters of the paging time window within each eDRX cycle. The time parameters of the paging time window are determined based on the calculation window of the paging time window and the first time information.

[0385] Optionally, the device 1700 further includes a processing unit that can skip the paging time window or a portion of the paging time window when the start position of the calculation window of the paging time window is within the second time period.

[0386] Optionally, the starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

[0387] Optionally, the end position of the calculation window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculation window and the second offset value.

[0388] Optionally, the second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

[0389] Optionally, the first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

[0390] Optionally, the network equipment includes a first satellite in the NTN, and the terminal equipment is located within the service area of ​​the first satellite at the current moment.

[0391] Optionally, the state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

[0392] Optionally, the communication equipment corresponding to the core network includes MME or AMF.

[0393] Figure 18 This is a schematic block diagram of another device for wireless communication according to an embodiment of this application. The device 1800 can be any of the communication devices corresponding to the core network described above. Figure 18 The apparatus 1800 shown includes a receiving unit 1810, a determining unit 1820, and a transmitting unit 1830.

[0394] The receiving unit 1810 can be used to receive first time information, which is used by the core network to determine the first configuration parameters of the terminal equipment.

[0395] The determining unit 1820 is used to determine the first configuration parameter, which is used by the terminal device to perform state transition.

[0396] The sending unit 1830 is used to send a first configuration parameter to the network device; wherein the first time information is related to a first time period and / or a second time period, the first time period is the time period from the current time to the start time of the terminal device entering the network coverage-free period, and the second time period is the duration of the network coverage-free period.

[0397] Optionally, the receiving unit 1810 is further configured to receive a first recommended parameter determined by the terminal device based on the first time information and the service type, the first recommended parameter being used by the core network to determine the first configuration parameter.

[0398] Optionally, the sending unit 1830 is also used to send core network cached data to the network device after the second time period.

[0399] Optionally, the first configuration parameter is a configuration parameter for a first mode of the terminal device, the first mode including one or more of the following: DRX mode, eDRX mode, and PSM mode.

[0400] Optionally, the first configuration parameters include the time parameters of the second timer and the third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period.

[0401] Optionally, the duration of the third timer is determined based on the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

[0402] Optionally, the second timer is a T3324 timer and the third timer is a T3412 timer, and the ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

[0403] Optionally, the first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameters of the paging time window within each eDRX cycle. The time parameters of the paging time window are determined based on the calculation window of the paging time window and the first time information.

[0404] Optionally, the starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

[0405] Optionally, the end position of the calculation window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculation window and the second offset value.

[0406] Optionally, the second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

[0407] Optionally, the first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

[0408] Optionally, the communication device communicates with the terminal device via a first satellite in the NTN.

[0409] Optionally, the state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

[0410] Optionally, the communication equipment corresponding to the core network includes MME or AMF.

[0411] Figure 19 The diagram shown is a schematic structural diagram of a communication device according to an embodiment of this application. Figure 19 The dashed lines indicate that the unit or module is optional. The device 1900 can be used to implement the methods described in the above method embodiments. The device 1900 can be a chip, terminal device, network device, or other communication device.

[0412] Apparatus 1900 may include one or more processors 1910. The processor 1910 may support apparatus 1900 in implementing the methods described in the preceding method embodiments. The processor 1910 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 other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor.

[0413] The apparatus 1900 may further include one or more memories 1920. The memories 1920 store a program that can be executed by the processor 1910, causing the processor 1910 to perform the methods described in the preceding method embodiments. The memories 1920 may be independent of the processor 1910 or integrated within the processor 1910.

[0414] The device 1900 may also include a transceiver 1930. The processor 1910 can communicate with other devices or chips via the transceiver 1930. For example, the processor 1910 can send and receive data with other devices or chips via the transceiver 1930.

[0415] This application also provides a computer-readable storage medium for storing a program. This computer-readable storage medium can be applied to a terminal device or network device provided in this application, and the program causes a computer to execute the methods performed by the terminal device or network device in various embodiments of this application.

[0416] The computer-readable storage medium can be any available medium that a computer can read, or a data storage device such as a server or data center that integrates one or more available media. The available medium can be magnetic media (e.g., floppy disks, hard disks, magnetic tapes), optical media (e.g., digital video discs, DVDs), or semiconductor media (e.g., solid-state disks, SSDs), etc.

[0417] This application also provides a computer program product. The computer program product includes a program. This computer program product can be applied to a terminal device or network device provided in this application embodiment, and the program causes a computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0418] In the above embodiments, implementation can be achieved, in whole or in part, through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented, in whole or in part, as 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, all or part of the processes or functions described in the embodiments of this application are generated. 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. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means.

[0419] This application also provides a computer program. This computer program can be applied to the terminal device or network device provided in this application, and the computer program causes the computer to execute the methods performed by the terminal or network device in various embodiments of this application.

[0420] In this application, the terms "system" and "network" are used interchangeably. Furthermore, the terminology used in this application is only for explaining specific embodiments of the application and is not intended to limit the application. The terms "first," "second," "third," and "fourth," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a specific order. In addition, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0421] In the embodiments of this application, the term "instruction" can be a direct instruction, an indirect instruction, or an indication of a relationship. For example, A instructing B can mean that A directly instructs B, such as B being able to obtain information through A; it can also mean that A indirectly instructs B, such as A instructing C, so B can obtain information through C; or it can mean that there is a relationship between A and B.

[0422] In the embodiments of this application, the term "correspondence" may indicate a direct or indirect correspondence between two things, or an association between two things, or a relationship such as instruction and being instructed, configuration and being configured.

[0423] In the embodiments of this application, "predefined" or "preconfigured" can be implemented by pre-storing corresponding codes, tables, or other means that can be used to indicate relevant information in the device (e.g., including terminal devices and network devices). This application does not limit the specific implementation method. For example, predefined can refer to what is defined in the protocol.

[0424] In the embodiments of this application, the term "protocol" may refer to standard protocols in the field of communications, such as LTE protocols, NR protocols, and related protocols applied in future communication systems. This application does not limit the scope of these protocols.

[0425] In the embodiments of this application, determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0426] In the embodiments of this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0427] In the embodiments of this application, the order of the above-mentioned process numbers does not imply 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 this application.

[0428] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0429] The units described as separate components may or may not be physically separate. 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 the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0430] In addition, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit.

[0431] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for wireless communication, characterized in that, include: Terminal equipment receives System Information Block (SIB); When the SIB includes beam information of any one of a plurality of satellites associated with the terminal device, the terminal device sends first time information, which is used by the core network to determine the first configuration parameters of the terminal device; The terminal device receives the first configuration parameter, which is used by the terminal device to perform a state transition. The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the no network coverage. The SIB is SIB32. When the SIB32 contains the beam information of the serving satellite, the cell corresponding to the serving satellite supports discontinuous coverage. The first time information also includes a third time period, which is the remaining duration for the first serving cell to provide services to the terminal device. The remaining duration is used to determine whether the terminal device establishes a Radio Resource Control (RRC) connection with the first serving cell.

2. The method according to claim 1, characterized in that, The method further includes: The terminal device determines a first recommended parameter based on the first time information and the service type, and the first recommended parameter is used by the core network to determine the first configuration parameter.

3. The method according to claim 1, characterized in that, The method further includes: After the second time period, the terminal device receives the data cached by the core network; or, After the second time period, the terminal device enters the automatic network selection mode.

4. The method according to claim 1, characterized in that, The first configuration parameter is a configuration parameter for a first mode of the terminal device. The first mode includes one or more of the following: discontinuous reception DRX mode, extended discontinuous reception eDRX mode, and power saving mode PSM mode.

5. The method according to any one of claims 1-4, characterized in that, The first configuration parameters include time parameters for a second timer and a third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period. The duration of the third timer is determined according to the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

6. The method according to claim 5, characterized in that, The second timer is a T3324 timer, and the third timer is a T3412 timer. The ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

7. The method according to any one of claims 1-4, characterized in that, The first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameter of the paging time window within each eDRX cycle. The time parameter of the paging time window is determined based on the calculation window of the paging time window and the first time information.

8. The method according to claim 7, characterized in that, The method further includes: When the starting position of the paging time window calculation window is within the second time period, the terminal device skips the paging time window or part of the paging opportunities within the paging time window.

9. The method according to claim 7, characterized in that, The starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

10. The method according to claim 7, characterized in that, The end position of the calculated window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculated window and the second offset value.

11. The method according to claim 7, characterized in that, The second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

12. The method according to any one of claims 1-4, characterized in that, The first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

13. The method according to any one of claims 1-4, characterized in that, The terminal device is located within the service area of ​​the first satellite in the non-terrestrial network NTN at the current time.

14. The method according to any one of claims 1-4, characterized in that, The state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

15. The method according to any one of claims 1-4, characterized in that, The communication equipment corresponding to the core network includes a Mobility Management Entity (MME) or an Access and Mobility Management Function (AMF).

16. A method for wireless communication, characterized in that, include: Network devices send System Information Blocks (SIBs); When the SIB includes beam information of any one of multiple satellites associated with the terminal device, the network device receives first time information, which is used by the core network to determine the first configuration parameters of the terminal device. The network device receives the first configuration parameter, which is used by the terminal device to perform a state transition. The network device sends the first configuration parameter to the terminal device; The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the no network coverage. The SIB is SIB32. When the SIB32 contains the beam information of the serving satellite, the cell corresponding to the serving satellite supports discontinuous coverage. The first time information also includes a third time period, which is the remaining duration for the first serving cell to provide services to the terminal device. The remaining duration is used to determine whether the terminal device establishes a Radio Resource Control (RRC) connection with the first serving cell.

17. The method according to claim 16, characterized in that, The method further includes: The network device receives a first recommended parameter determined by the terminal device based on the first time information and the service type. The first recommended parameter is used by the core network to determine the first configuration parameter. The network device sends the first recommended parameters to the core network.

18. The method according to claim 16, characterized in that, The method further includes: After the second time period, the network device sends the core network cached data to the terminal device.

19. The method according to claim 16, characterized in that, The first configuration parameter is a configuration parameter for a first mode of the terminal device. The first mode includes one or more of the following: discontinuous reception DRX mode, extended discontinuous reception eDRX mode, and power saving mode PSM mode.

20. The method according to any one of claims 16-19, characterized in that, The first configuration parameters include time parameters for a second timer and a third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period. The duration of the third timer is determined according to the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

21. The method according to claim 20, characterized in that, The second timer is a T3324 timer, and the third timer is a T3412 timer. The ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

22. The method according to any one of claims 16-19, characterized in that, The first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameter of the paging time window within each eDRX cycle. The time parameter of the paging time window is determined based on the calculation window of the paging time window and the first time information.

23. The method according to claim 22, characterized in that, The method further includes: When the starting position of the paging time window calculation window is within the second time period, the network device skips the paging time window or part of the paging opportunities within the paging time window.

24. The method according to claim 22, characterized in that, The starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

25. The method according to claim 22, characterized in that, The end position of the calculated window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculated window and the second offset value.

26. The method according to claim 22, characterized in that, The second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

27. The method according to any one of claims 16-19, characterized in that, The first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

28. The method according to any one of claims 16-19, characterized in that, The network device includes a first satellite in a non-terrestrial network (NTN), and the terminal device is located within the service area of ​​the first satellite at the current time.

29. The method according to any one of claims 16-19, characterized in that, The state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

30. The method according to any one of claims 16-19, characterized in that, The communication equipment corresponding to the core network includes a Mobility Management Entity (MME) or an Access and Mobility Management Function (AMF).

31. A method for wireless communication, characterized in that, The method, applied to communication equipment corresponding to the core network, includes: Receive first time information, which is used by the core network to determine the first configuration parameters of the terminal device; The first configuration parameter is determined, and the first configuration parameter is used by the terminal device to perform a state transition; Send the first configuration parameter to the network device; The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the no network coverage. When the system information block (SIB) received by the terminal device includes beam information of any satellite among multiple satellites associated with the terminal device, the first time information is sent by the terminal device to the network device. The SIB is SIB32. When the SIB32 contains beam information of a serving satellite, the cell corresponding to the serving satellite supports discontinuous coverage. The first time information also includes a third time period, which is the remaining duration for the first serving cell to provide services to the terminal device. The remaining duration is used to determine whether the terminal device establishes a Radio Resource Control (RRC) connection with the first serving cell.

32. The method according to claim 31, characterized in that, The method further includes: The terminal device receives a first recommended parameter determined by the first time information and the service type, and the first recommended parameter is used by the core network to determine the first configuration parameter.

33. The method according to claim 31, characterized in that, The method further includes: After the second time period, the data cached in the core network is sent to the network device.

34. The method according to claim 31, characterized in that, The first configuration parameter is a configuration parameter for a first mode of the terminal device. The first mode includes one or more of the following: discontinuous reception DRX mode, extended discontinuous reception eDRX mode, and power saving mode PSM mode.

35. The method according to any one of claims 31-34, characterized in that, The first configuration parameters include time parameters for a second timer and a third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period. The duration of the third timer is determined according to the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

36. The method according to claim 35, characterized in that, The second timer is a T3324 timer, and the third timer is a T3412 timer. The ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

37. The method according to any one of claims 31-34, characterized in that, The first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameter of the paging time window within each eDRX cycle. The time parameter of the paging time window is determined based on the calculation window of the paging time window and the first time information.

38. The method according to claim 37, characterized in that, The starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

39. The method according to claim 37, characterized in that, The end position of the calculated window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculated window and the second offset value.

40. The method according to claim 37, characterized in that, The second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

41. The method according to any one of claims 31-34, characterized in that, The first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

42. The method according to any one of claims 31-34, characterized in that, The communication device communicates with the terminal device via a first satellite in the non-terrestrial network NTN.

43. The method according to any one of claims 31-34, characterized in that, The state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

44. The method according to any one of claims 31-34, characterized in that, The communication equipment corresponding to the core network includes a Mobility Management Entity (MME) or an Access and Mobility Management Function (AMF).

45. An apparatus for wireless communication, characterized in that, The device is a terminal device, and the device includes: The receiving unit is used to receive system information blocks (SIBs). The transmitting unit, when the SIB includes beam information of any one of a plurality of satellites associated with the terminal device, is used to transmit first time information, the first time information being used by the core network to determine first configuration parameters of the terminal device; The receiving unit is further configured to receive the first configuration parameter, which is used by the terminal device to perform a state transition. The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the no network coverage. The SIB is SIB32. When the SIB32 contains the beam information of the serving satellite, the cell corresponding to the serving satellite supports discontinuous coverage. The first time information also includes a third time period, which is the remaining duration for the first serving cell to provide services to the terminal device. The remaining duration is used to determine whether the terminal device establishes a Radio Resource Control (RRC) connection with the first serving cell.

46. ​​The apparatus according to claim 45, characterized in that, The device further includes: The determining unit is configured to determine a first recommended parameter based on the first time information and the service type, wherein the first recommended parameter is used by the core network to determine the first configuration parameter.

47. The apparatus according to claim 45, characterized in that, The receiving unit is further configured to receive the data cached in the core network after the second time period; or, the apparatus further includes: The first processing unit is configured to enter an automatic network selection mode after the second time period.

48. The apparatus according to claim 45, characterized in that, The first configuration parameter is a configuration parameter for a first mode of the terminal device. The first mode includes one or more of the following: discontinuous reception DRX mode, extended discontinuous reception eDRX mode, and power saving mode PSM mode.

49. The apparatus according to any one of claims 45-48, characterized in that, The first configuration parameters include time parameters for a second timer and a third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period. The duration of the third timer is determined according to the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

50. The apparatus according to claim 49, characterized in that, The second timer is a T3324 timer, and the third timer is a T3412 timer. The ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

51. The apparatus according to any one of claims 45-48, characterized in that, The first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameter of the paging time window within each eDRX cycle. The time parameter of the paging time window is determined based on the calculation window of the paging time window and the first time information.

52. The apparatus according to claim 51, characterized in that, The device further includes: The second processing unit is used to skip the paging time window or a portion of the paging opportunities within the paging time window when the start position of the calculation window of the paging time window is within the second time period.

53. The apparatus according to claim 51, characterized in that, The starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

54. The apparatus according to claim 51, characterized in that, The end position of the calculated window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculated window and the second offset value.

55. The apparatus according to claim 51, characterized in that, The second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

56. The apparatus according to any one of claims 45-48, characterized in that, The first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

57. The apparatus according to any one of claims 45-48, characterized in that, The terminal device is located within the service area of ​​the first satellite in the non-terrestrial network NTN at the current time.

58. The apparatus according to any one of claims 45-48, characterized in that, The state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

59. The apparatus according to any one of claims 45-48, characterized in that, The communication equipment corresponding to the core network includes a Mobility Management Entity (MME) or an Access and Mobility Management Function (AMF).

60. An apparatus for wireless communication, characterized in that, The device is a network device, and the device includes: The transmitting unit is used to transmit System Information Blocks (SIBs). The first receiving unit is used to receive first time information when the SIB includes beam information of any one of the multiple satellites associated with the terminal device. The first time information is used by the core network to determine the first configuration parameters of the terminal device. The second receiving unit is configured to receive the first configuration parameters, which are used by the terminal device to perform state transitions. The sending unit is also used to send the first configuration parameters to the terminal device; The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the no network coverage. The SIB is SIB32. When the SIB32 contains the beam information of the serving satellite, the cell corresponding to the serving satellite supports discontinuous coverage. The first time information also includes a third time period, which is the remaining duration for the first serving cell to provide services to the terminal device. The remaining duration is used to determine whether the terminal device establishes a Radio Resource Control (RRC) connection with the first serving cell.

61. The apparatus according to claim 60, characterized in that, The first receiving unit is further configured to receive a first recommended parameter determined by the terminal device based on the first time information and the service type, wherein the first recommended parameter is used by the core network to determine the first configuration parameter; The sending unit is also used to send the first recommended parameters to the core network.

62. The apparatus according to claim 60, characterized in that, The sending unit is further configured to send the core network cached data to the terminal device after the second time period.

63. The apparatus according to claim 60, characterized in that, The first configuration parameter is a configuration parameter for a first mode of the terminal device. The first mode includes one or more of the following: discontinuous reception DRX mode, extended discontinuous reception eDRX mode, and power saving mode PSM mode.

64. The apparatus according to any one of claims 60-63, characterized in that, The first configuration parameters include time parameters for a second timer and a third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period. The duration of the third timer is determined according to the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

65. The apparatus according to claim 64, characterized in that, The second timer is a T3324 timer, and the third timer is a T3412 timer. The ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

66. The apparatus according to any one of claims 60-63, characterized in that, The first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameter of the paging time window within each eDRX cycle. The time parameter of the paging time window is determined based on the calculation window of the paging time window and the first time information.

67. The apparatus according to claim 66, characterized in that, The device further includes: The processing unit is configured to skip the paging time window or a portion of the paging opportunities within the paging time window when the start position of the calculation window of the paging time window is within the second time period.

68. The apparatus according to claim 66, characterized in that, The starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

69. The apparatus according to claim 66, characterized in that, The end position of the calculated window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculated window and the second offset value.

70. The apparatus according to claim 66, characterized in that, The second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

71. The apparatus according to any one of claims 60-63, characterized in that, The first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

72. The apparatus according to any one of claims 60-63, characterized in that, The network device includes a first satellite in a non-terrestrial network (NTN), and the terminal device is located within the service area of ​​the first satellite at the current time.

73. The apparatus according to any one of claims 60-63, characterized in that, The state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

74. The apparatus according to any one of claims 60-63, characterized in that, The communication equipment corresponding to the core network includes a Mobility Management Entity (MME) or an Access and Mobility Management Function (AMF).

75. An apparatus for wireless communication, characterized in that, The device is a communication device corresponding to the core network, and the device includes: The receiving unit is configured to receive first time information, which is used by the core network to determine the first configuration parameters of the terminal device. A determining unit is configured to determine the first configuration parameter, wherein the first configuration parameter is used by the terminal device to perform a state transition. The sending unit is used to send the first configuration parameters to the network device; The first time information is related to a first time period and / or a second time period. The first time period is the time period from the current time to the start time when the terminal device enters a state of no network coverage, and the second time period is the duration of the no network coverage. When the system information block (SIB) received by the terminal device includes beam information of any satellite among multiple satellites associated with the terminal device, the first time information is sent by the terminal device to the network device. The SIB is SIB32. When the SIB32 contains beam information of a serving satellite, the cell corresponding to the serving satellite supports discontinuous coverage. The first time information also includes a third time period, which is the remaining duration for the first serving cell to provide services to the terminal device. The remaining duration is used to determine whether the terminal device establishes a Radio Resource Control (RRC) connection with the first serving cell.

76. The apparatus according to claim 75, characterized in that, The receiving unit is further configured to receive a first recommended parameter determined by the terminal device based on the first time information and the service type, wherein the first recommended parameter is used by the core network to determine the first configuration parameter.

77. The apparatus according to claim 75, characterized in that, The sending unit is further configured to send the core network cached data to the network device after the second time period.

78. The apparatus according to claim 75, characterized in that, The first configuration parameter is a configuration parameter for a first mode of the terminal device. The first mode includes one or more of the following: discontinuous reception DRX mode, extended discontinuous reception eDRX mode, and power saving mode PSM mode.

79. The apparatus according to any one of claims 75-78, characterized in that, The first configuration parameters include time parameters for a second timer and a third timer. The second timer is used to determine the duration of the terminal device in the RRC idle state, and the third timer is used to determine the duration of the terminal device in the PSM state. The start time of the second timer and the third timer is the end time of the first time period. The duration of the third timer is determined according to the second time period, and the end time of the third timer is not earlier than the end time of the second time period.

80. The apparatus according to claim 79, characterized in that, The second timer is a T3324 timer, and the third timer is a T3412 timer. The ratio of the duration of the second timer to the duration of the third timer is less than the first parameter.

81. The apparatus according to any one of claims 75-78, characterized in that, The first configuration parameter is used to determine the configuration parameters of the eDRX mode. The configuration parameters of the eDRX mode include the time parameter of the paging time window within each eDRX cycle. The time parameter of the paging time window is determined based on the calculation window of the paging time window and the first time information.

82. The apparatus according to claim 81, characterized in that, The starting position of the calculation window of the paging time window is within the second time period, and the starting position of the actual window of the paging time window is the sum of the starting position of the calculation window and the first offset value.

83. The apparatus according to claim 81, characterized in that, The end position of the calculated window of the paging time window is within the second time period, and the end position of the actual window of the paging time window is the difference between the end position of the calculated window and the second offset value.

84. The apparatus according to claim 81, characterized in that, The second time period overlaps with the calculation windows of the paging time windows in two adjacent eDRX cycles, namely the first eDRX cycle and the second eDRX cycle. The actual end position of the paging time window in the first eDRX cycle is no later than the start time of the second time period, and the actual start position of the paging time window in the second eDRX cycle is no earlier than the end time of the second time period.

85. The apparatus according to any one of claims 75-78, characterized in that, The first configuration parameter includes the eDRX period, which is proportional to the duration of the second time period.

86. The apparatus according to any one of claims 75-78, characterized in that, The communication device communicates with the terminal device via a first satellite in the non-terrestrial network NTN.

87. The apparatus according to any one of claims 75-78, characterized in that, The state transition includes the transition between any two of the following three states: RRC active state, RRC idle state, and PSM state.

88. The apparatus according to any one of claims 75-78, characterized in that, The communication equipment corresponding to the core network includes a Mobility Management Entity (MME) or an Access and Mobility Management Function (AMF).

89. A communication device, characterized in that, It includes a memory and a processor, the memory being used to store a program, and the processor being used to invoke the program in the memory to perform the method as described in any one of claims 1-44.

90. A communication device, characterized in that, Includes a processor for calling a program from memory to perform the method as described in any one of claims 1-44.

91. A chip, characterized in that, Includes a processor for calling a program from memory, causing a device on which the chip is mounted to perform the method as described in any one of claims 1-44.

92. A computer-readable storage medium, characterized in that, It contains a program that causes a computer to perform the method as described in any one of claims 1-44.

93. A computer program product, characterized in that, Includes a program that causes a computer to perform the method as described in any one of claims 1-44.

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