NTN communication method, communication device and system

Abstract

The invention provides an NTN communication method, a communication device and a system. In the method, a network device obtains first information and sends the first information to a terminal device, and the first information is used for indicating that an SSB scanning state corresponding to a first wave position is switched. In this way, the signaling overhead of the system can be saved.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly to an NTN communication method, communication device, and system. Background Technology

[0002] With the development of information technology, there are more urgent demands for efficient, mobile, and diverse communication. Currently, satellites play an irreplaceable role in some important fields, such as space communication and aerospace communication. Satellite communication has the characteristics of long communication distance, large coverage area, and flexible networking. It can provide services for both fixed terminal equipment and various mobile terminal equipment. Since traditional terrestrial networks cannot provide seamless coverage for terminal equipment, especially in places where base stations cannot be deployed, such as the ocean, desert, and air, non-terrestrial networks (NTNs) have been introduced into the 5th generation mobile communication system (5G). NTNs provide seamless coverage for terminal equipment (e.g., non-terrestrial network user equipment, NTN-UE) by deploying base stations or part of their functions on high-altitude platforms or satellites. Furthermore, high-altitude platforms or satellites are less affected by natural disasters, which can improve the reliability of the 5G system. Traditional terminal equipment (e.g., user equipment, UE) is used to communicate with traditional terrestrial networks (e.g., 4th generation mobile communication systems, 4G, 5G, etc.).

[0003] Currently, when the traffic volume or the density of connected terminal devices in a satellite cell changes, the network device will issue a radio resource control (RRC) release to the connected terminal device (e.g., NTN-UE), and the terminal device needs to reconnect to the network. However, this method increases the signaling overhead of the system. Summary of the Invention

[0004] This application provides an NTN communication method, communication device, and system, which helps to reduce the signaling overhead of the system.

[0005] Firstly, an NTN communication method is provided. This method can be applied to a network device, for example, it can be executed by the network device itself, or it can be executed by components configured in the network device (such as processors, chips, chip systems, etc.), or it can be implemented by logic modules or software capable of implementing all or part of the functions of the network device. This application does not limit this.

[0006] The method includes: a network device acquiring first information, which is used to indicate that the scanning state of the synchronization signal block (SSB) corresponding to the first wave position has changed; and the network device sending the first information.

[0007] Based on the above scheme, the network device can send first information to the terminal device. This first information indicates that the SSB scanning state corresponding to a wavelet (e.g., the first wavelet) has switched, so that the terminal device can switch its SSB reception state in a timely manner, that is, receive SSBs based on the SSB burst period corresponding to the switched SSB scanning state. Therefore, when the network device switches the SSB scanning state of a wavelet (e.g., the first wavelet), it does not need to release the terminal device, nor does the terminal device need to reconnect to the network. This saves system signaling overhead.

[0008] In one possible implementation, the method further includes: the network device receiving third information indicating traffic in the first wavelet or latency information of the first wavelet. This allows the network device to determine whether to switch the SSB scan state corresponding to the first wavelet based on the traffic or latency information in the wavelet.

[0009] In one possible implementation, the method further includes: the network device receiving second information. This allows the network device to determine, based on the second information, whether to switch the SSB scan state corresponding to the first spectral bit.

[0010] Secondly, an NTN communication method is provided. This method can be applied to a terminal device, for example, it can be executed by the terminal device itself, or it can be executed by components configured in the terminal device (such as processors, chips, chip systems, etc.), or it can be implemented by logic modules or software capable of implementing all or part of the functions of the terminal device. This application does not limit this.

[0011] The method includes: a terminal device receiving first information, the first information being used to indicate that the SSB scanning state corresponding to the first wave position has been switched; and the terminal device switching the SSB receiving state corresponding to the first wave position based on the first information.

[0012] In one possible implementation, the method further includes sending third information, which indicates the flow rate in the first wave bit, or the delay information of the first wave bit.

[0013] In one possible implementation, the method further includes sending a second message.

[0014] The beneficial effects of the second aspect and the possible implementations described above can be found in the first aspect and the beneficial effects of the various possible implementations of the first aspect, and will not be repeated here.

[0015] In conjunction with the first or second aspect, in some implementations, the first information is used to indicate at least one of the following: a first spread factor of the first burst period of the first SSB corresponding to the first strobe bit, wherein the first burst period is the period corresponding to the SSB scan state before the handover; a first time-domain offset of the first burst time-domain position of the first SSB; the index of the first SSB; and the start time of the SSB scan state after the handover. Thus, when the SSB scan state corresponding to the first strobe bit changes, the terminal device can switch the SSB reception state corresponding to the first strobe bit based on the information indicated by the first information.

[0016] In conjunction with the first or second aspect, in some implementations, the first information is determined based on at least one of the following: traffic in the first wavelet; delay information of the first wavelet; the time interval for hopping beams to revisit the first wavelet recorded by a first timer; and the quantity of second information, which is used to request a switch of SSB scan state. Thus, when the network device determines that one of these factors is greater than or less than a preset threshold, the network device can switch the SSB scan state corresponding to the first wavelet.

[0017] In conjunction with the first or second aspect, in some implementations, the SSB burst period corresponding to the SSB scan state before handover is a preset period, or determined based on at least one of the following: the SSB burst period configured for a first wave position within a historical time period; a second spreading factor; and a second time-domain offset of the SSB burst time-domain position corresponding to the SSB scan state before handover. Network devices can configure the SSB burst period corresponding to the SSB scan state before handover in various ways, thus making the configuration of the SSB burst period corresponding to the SSB scan state before handover more flexible.

[0018] In conjunction with the first or second aspect, in some implementations, the first information is carried via RRC signaling or via downlink control information (DCI). This improves the overall efficiency of the system by appropriately selecting the signaling mechanism.

[0019] Thirdly, an NTN communication method is provided, which can be applied to network devices. For example, it can be executed by the network device itself, or by components configured in the network device (such as processors, chips, chip systems, etc.), or by logic modules or software capable of implementing all or part of the functions of the network device. This application does not limit this aspect.

[0020] The method includes: configuring duration information on the network device, which indicates the duration of the SSB scan state corresponding to the second wave bit; and transmitting the duration information on the network device.

[0021] Based on the above scheme, the network device can send duration information to the terminal device. This duration information indicates the duration of the SSB scan state corresponding to the second wave bit, so that the terminal device can switch the SSB reception state corresponding to the second wave bit when the duration indicated by the duration information is reached. This notification method for SSB scan state switching is relatively simple and can save system signaling overhead.

[0022] In one possible implementation, this duration information is indicated by a timer. This simplifies the switching process for the SSB scan state corresponding to the waveform, thereby saving signaling overhead.

[0023] In one possible implementation, duration information is carried via RRC signaling or DCI. This improves overall system efficiency by appropriately selecting the signaling mechanism.

[0024] Fourthly, an NTN communication method is provided. This method can be applied to a terminal device, for example, it can be executed by the terminal device itself, or it can be executed by components configured in the terminal device (such as processors, chips, chip systems, etc.), or it can be implemented by logic modules or software capable of implementing all or part of the functions of the terminal device. This application does not limit this aspect.

[0025] The method includes: the terminal device receiving duration information; and when the duration indicated by the duration information is reached, the terminal device switching the SSB reception state corresponding to the second wave bit.

[0026] In one possible implementation, the duration information is indicated using a timer.

[0027] In one possible implementation, duration information is carried via RRC signaling, or via DCI.

[0028] The beneficial effects of the fourth aspect and the possible implementations described above can be found in the third aspect and the beneficial effects of the various possible implementations of the third aspect, and will not be repeated here.

[0029] Fifthly, an NTN communication method is provided. This method can be applied to a network device, for example, it can be executed by the network device itself, or it can be executed by components configured in the network device (such as processors, chips, chip systems, etc.), or it can be implemented by logic modules or software capable of implementing all or part of the functions of the network device. This application does not limit this aspect.

[0030] The method includes: a network device acquiring fourth information, which is used to indicate the third spread factor of the third burst period of the third SSB corresponding to the wavelength position of the terminal device, and / or the third time domain offset of the third burst time domain position of the third SSB; and the network device sending the fourth information.

[0031] Based on the above scheme, network devices can send the spread factor of the SSB burst period corresponding to their current wavelength (e.g., the third spread factor of the third burst period of the third SSB) and / or the time domain offset of the SSB burst time domain position (e.g., the third time domain offset of the third burst time domain position of the third SSB) to the terminal devices to configure the wavelength-level SSB burst mode. In this way, the system resource utilization can be improved with less signaling overhead.

[0032] In one possible implementation, the fourth information is carried via a master information block (MIB) message, or via a beam-level broadcast message, or via a DCI. This improves the overall system efficiency by appropriately selecting the signaling mechanism.

[0033] In one possible implementation, the MIB message includes two bits indicating at least one of the following: a different spread factor for the third burst cycle; a different time-domain offset for the third burst's time-domain position; a first valid bit indicating the enabling of the spread factor for the third burst cycle, and a second valid bit indicating the enabling of the time-domain offset for the third burst's time-domain position. This simplifies signaling and improves resource utilization efficiency.

[0034] Sixthly, an NTN communication method is provided. This method can be applied to a terminal device, for example, it can be executed by the terminal device itself, or it can be executed by components configured in the terminal device (such as processors, chips, chip systems, etc.), or it can be implemented by logic modules or software capable of implementing all or part of the functions of the terminal device. This application does not limit this aspect.

[0035] The method includes: a terminal device receiving fourth information, which indicates a third spread factor of the third burst period of the third SSB corresponding to the wavelength position where the terminal device is located, and / or a third time-domain offset of the third burst time-domain position of the third SSB; the terminal device determining, based on the fourth information, the fourth burst period of the third SSB corresponding to the wavelength position where the terminal device is located, and / or the fourth burst time-domain position of the third SSB.

[0036] In one possible implementation, the fourth information is carried via a MIB message, or via a beam-level broadcast message; or via a DCI.

[0037] In one possible implementation, the MIB message includes two bits, which are used to indicate at least one of the following: a different spread factor for the third burst period; a different time-domain offset for the time-domain position of the third burst; a first valid bit of the two bits is used to indicate the enabling of the spread factor for the third burst period, and a second valid bit is used to indicate the enabling of the time-domain offset for the time-domain position of the third burst.

[0038] The beneficial effects of the sixth aspect and the possible implementations described above can be found in the fifth aspect and the beneficial effects of the various possible implementations of the fifth aspect, and will not be repeated here.

[0039] In a seventh aspect, a communication apparatus is provided that can implement the communication method described in any of the possible implementations of the first to sixth aspects. The apparatus includes one or more corresponding functional units or modules for performing the described method. The functional units or modules included in the apparatus can be implemented by software and / or hardware.

[0040] Eighthly, a communication device is provided, comprising at least one processor for executing the communication method described in any of the possible implementations of the first to sixth aspects.

[0041] Optionally, the apparatus may further include a memory for storing instructions and data. The memory is coupled to the processor, which, when executing the instructions stored in the memory, can implement the methods described in the foregoing aspects.

[0042] Optionally, the device may further include a communication interface for communicating with other devices. For example, the communication interface may be a transceiver, circuit, bus, module, or other type of communication interface.

[0043] In a ninth aspect, a chip system is provided, the chip system including at least one processor for supporting the implementation of the functions involved in any of the possible implementations of the first to sixth aspects described above, such as receiving or processing data and / or information involved in the methods described above.

[0044] In one possible design, the chip system also includes a memory for storing program instructions and data, which may be located within or outside the processor.

[0045] In one possible design, the chip system further includes an interface circuit and / or a power supply circuit, wherein the interface circuit is used to transmit data and the power supply circuit is used to supply power to the chip system.

[0046] The chip system can consist of chips or include chips and other discrete components.

[0047] In a tenth aspect, a communication system is provided, which includes the aforementioned network equipment and terminal equipment.

[0048] Eleventhly, a computer-readable storage medium is provided, including a computer program that, when run on a computer, causes the computer to implement the method in any of the possible implementations of the first to sixth aspects.

[0049] In a twelfth aspect, a computer program product is provided, the computer program product comprising: a computer program (also referred to as code or instructions), which, when run, causes a computer to perform a method in any of the possible implementations of the first to sixth aspects. Attached Figure Description

[0050] Figure 1 This is a schematic diagram of a communication system provided in an embodiment of this application;

[0051] Figure 2 This is a schematic diagram of a network architecture provided in an embodiment of this application;

[0052] Figure 3 This is a schematic flowchart of an NTN communication method provided in an embodiment of this application;

[0053] Figure 4 This is a schematic diagram of a terminal device requesting to switch the SSB scanning state, provided in an embodiment of this application.

[0054] Figure 5 This is a schematic diagram illustrating the change in the SSB scan state corresponding to the wave position provided in the embodiments of this application;

[0055] Figure 6 This is a schematic flowchart of yet another NTN communication method provided in the embodiments of this application;

[0056] Figure 7 This is a schematic diagram of a timer configured in a waveform according to an embodiment of this application;

[0057] Figure 8 This is a schematic flowchart of yet another NTN communication method provided in the embodiments of this application;

[0058] Figure 9 This is a schematic diagram of the wave positions in different regions within the satellite coverage area provided in the embodiments of this application;

[0059] Figure 10 This is a schematic diagram of SSB burst modes corresponding to different wave positions provided in the embodiments of this application;

[0060] Figure 11 This is a schematic block diagram of the communication device provided in the embodiments of this application;

[0061] Figure 12 This is another schematic block diagram of the communication device provided in the embodiments of this application. Detailed Implementation

[0062] The technical solution provided in this application will now be described with reference to the accompanying drawings.

[0063] To facilitate understanding of the embodiments of this application, the following points will be explained first:

[0064] First, in this application, the indication includes explicit indication (also known as direct indication) and implicit indication (also known as indirect indication). Explicit indication information A means including information A; implicit indication information A means indicating information A through the correspondence between information A and information B, and direct indication information B. The correspondence between information A and information B can be predefined, pre-stored, pre-burned, or pre-configured; or it can refer to indicating information A through information B and preset rules.

[0065] Second, in this application, information C is used to determine information D, which includes both determining information D based solely on information C and determining it based on information C and other information. Furthermore, information C can also be used to determine information D indirectly, for example, in the case where information D is determined based on information E, and information E is determined based on information C.

[0066] Third, in this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates an "or" relationship between the preceding and following related objects, but it does not exclude the possibility of indicating an "and" relationship; the specific meaning can be understood in context. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c; a and b; a and c; b and c; or a and b and c. Here, a, b, and c can be single or multiple.

[0067] Fourth, the use of prefixes such as "first" and "second" in this application is solely for the purpose of distinguishing different things belonging to the same category, and does not constrain the order, size, or quantity of things. For example, "first information" and "second information" are simply different pieces of information, and there is no temporal sequence, size, or priority relationship between them. Similarly, "first wave position" and "second wave position" are simply different wave positions, and there is no temporal sequence, size, or priority relationship between them.

[0068] Fifth, in this application, "send" and "receive" indicate the direction of signal transmission. For example, "send first information to a terminal device" can be understood as the destination of the first information being the terminal device, which may include direct transmission via the air interface or indirect transmission via the air interface by other units or modules. "Receive first information from a network device" can be understood as the source of the first information being the network device, which may include direct reception from the network device via the air interface or indirect reception from the network device via the air interface by other units or modules. "Send" can also be understood as the "output" of the chip interface, and "receive" can also be understood as the "input" of the chip interface.

[0069] In other words, sending and receiving can occur between devices, such as between terminal devices and network devices; or they can occur within a device, such as between components, modules, chips, software modules, or hardware modules within a device via a bus, wiring, or interface.

[0070] Sixth, in the embodiments of this application, "when," "if," and "if" all refer to the device making corresponding processing under certain objective circumstances, and are not limited to a time, nor do they require the device to make a judgment action when it is implemented, nor do they mean that there are other limitations.

[0071] The technical solutions provided in this application can be applied to various communication systems, such as: Long Term Evolution (LTE) systems, LTE Frequency Division Duplex (FDD) systems, LTE Time Division Duplex (TDD) systems, sidelink (SL) communication systems, Universal Mobile Telecommunication System (UMTS), Worldwide Interoperability for Microwave Access (WiMAX) communication systems, 5th Generation (5G) mobile communication systems, or new radio access technology (NR). Among these, 5G mobile communication systems can include non-standalone (NSA) and / or standalone (SA) networking. The technical solutions provided in this application can also be applied to future communication networks. This application does not limit the scope of the application in this regard.

[0072] Figure 1 A schematic diagram of the architecture of a communication system applicable to the communication method of this application is shown. For example... Figure 1 As shown, the communication system 100 may include at least one network device (e.g., satellite 110) and at least one terminal device (e.g., terminal device 120), and the network device and the terminal device may communicate with each other via a wireless link.

[0073] It should be understood that Figure 1 Only one satellite and one terminal device are shown. In actual use, more satellites and terminal devices can be deployed as needed. Each satellite can provide services to one or more terminal devices, but this embodiment does not limit this.

[0074] The satellite mentioned in the embodiments of this application can be a satellite base station or a network-side device mounted on a satellite.

[0075] In the embodiments of this application, the terminal device may also be referred to as UE, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent, or user equipment.

[0076] Terminal devices can be devices that provide voice / data, such as handheld devices with wireless connectivity, in-vehicle devices, etc. Currently, examples of terminals include: mobile phones, tablets, laptops, PDAs, mobile internet devices (MIDs), wearable devices, virtual reality (VR) devices, augmented reality (AR) devices, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, wearable devices, terminal devices in 5G networks, or terminal devices in future communication networks, etc., and the embodiments of this application are not limited to these.

[0077] By way of example and not limitation, in this embodiment, the terminal device can also be a wearable device. Wearable devices, also known as wearable smart devices, are a general term for devices that utilize wearable technology to intelligently design and develop everyday wearables, such as glasses, gloves, watches, clothing, and shoes. Wearable devices are portable devices that are worn directly on the body or integrated into the user's clothing or accessories. Wearable devices are not merely hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are feature-rich, large in size, and can achieve complete or partial functions without relying on a smartphone, such as smartwatches or smart glasses, as well as those that focus on a specific type of application function and require the use of other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0078] In this embodiment, the device for implementing the functions of the terminal device can be the terminal device itself, or it can be any device capable of supporting the terminal device in implementing those functions, such as a chip system. This device can be installed in or used in conjunction with the terminal device. In this embodiment, the chip system can be composed of chips or may include chips and other discrete components. This embodiment only uses the terminal device as an example to illustrate the device for implementing the functions of the terminal device, and does not constitute a limitation on the solution of this embodiment.

[0079] The network device in this application embodiment can be a device for communicating with a terminal device. This network device can also be called an access network device or a wireless access network device, such as a base station. In this application embodiment, the network device can refer to a radio access network (RAN) node (or device) that connects the terminal device to the wireless network. A base station can broadly encompass, or be replaced by, various names including: NodeB, evolved NodeB (eNB), next-generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station, auxiliary station, multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), radio unit (RU), positioning node, satellite base station, cellular base station, etc. A base station can be a macro base station, micro base station, relay node, donor node, 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 future communication networks, or equipment performing base station functions in future communication systems. A base station can support networks using the same or different access technologies. Optionally, a RAN node can also be a server, wearable device, vehicle, or in-vehicle equipment. For example, the access network equipment in vehicle-to-everything (V2X) technology can be a roadside unit (RSU). The embodiments of this application do not limit the specific technologies or equipment forms used in the network equipment.In some deployments, the network devices mentioned in the embodiments of this application may be devices including CU, DU, or CU and DU, or devices with control plane CU nodes (central unit-control plane (CU-CP)) and user plane CU nodes (central unit-user plane (CU-UP)) and DU nodes. For example, the network devices may include gNB-CU-CP, gNB-CU-UP, and gNB-DU.

[0080] In some deployments, multiple RAN nodes collaborate to assist terminals in achieving wireless access, with different RAN nodes each implementing some of the base station's functions. For example, RAN nodes can be CUs, DUs, CU-CPs, CU-UPs, or RUs. CUs and DUs can be configured separately or included in the same network element, such as a BBU. RUs can be included in radio frequency equipment or radio frequency units, such as RRUs, AAUs, or RRHs.

[0081] RAN nodes can support one or more types of fronthaul interfaces, each corresponding to a DU and RU with different functions. If the fronthaul interface between the DU and RU is a common public radio interface (CPRI), the DU is configured to implement one or more baseband functions, and the RU is configured to implement one or more radio frequency functions. If the fronthaul interface between the DU and RU is another type of interface, relative to CPRI, some downlink and / or uplink baseband functions, such as, for downlink, precoding, digital beamforming (BF), or one or more of inverse fast Fourier transform (IFFT) / cyclic prefix addition (CP), are moved from the DU to the RU; and for uplink, digital beamforming (BF), or one or more of fast Fourier transform (FFT) / cyclic prefix removal (CP), are moved from the DU to the RU. In one possible implementation, the interface can be an enhanced common public radio interface (eCPRI). Under the eCPRI architecture, the segmentation between DU and RU differs, corresponding to different categories (Cat) of eCPRI, such as eCPRI Cat A, B, C, D, E, F.

[0082] Taking eCPRI Cat A as an example, for downlink transmission, layer mapping is used as the dividing line. DU is configured to implement one or more functions preceding layer mapping (i.e., coding, rate matching, scrambling, modulation, and layer mapping), while other functions following layer mapping (e.g., RE mapping, digital beamforming (BF), or one or more inverse fast Fourier transform (IFFT) / cyclic prefix (CP) addition) are moved to RU. For uplink transmission, deRE mapping is used as the dividing line. DU is configured to implement one or more functions preceding deRE mapping (i.e., decoding, rate matching de-matching, descrambling, demodulation, inverse discrete Fourier transform (IDFT), channel equalization, and deRE mapping), while other functions following deRE mapping (e.g., digital BF or fast Fourier transform (FFT) / CP removal) are moved to RU. It is understandable that the functional descriptions of the DU and RU corresponding to various types of eCPRI can be found in the eCPRI protocol, and will not be elaborated here.

[0083] In one possible design, the processing unit in the BBU used to implement baseband functions is called the baseband high (BBH) unit, and the processing unit in the RRU / AAU / RRH used to implement baseband functions is called the baseband low (BBL) unit.

[0084] In different systems, CU (or CU-CP and CU-UP), DU, or RU may have different names, but those skilled in the art will understand their meaning. For example, in an ORAN system, CU can also be called O-CU (open CU), DU can also be called O-DU, CU-CP can also be called O-CU-CP, CU-UP can also be called O-CU-UP, and RU can also be called O-RU. Any of the units among CU (or CU-CP, CU-UP), DU, and RU in this application can be implemented through software modules, hardware modules, or a combination of software modules and hardware modules.

[0085] In this embodiment, the apparatus for implementing the functions of a network device can be a network device itself; it can also be an apparatus capable of supporting the network device in implementing those functions, such as a chip system, hardware circuit, software module, or a hardware circuit plus a software module. This apparatus can be installed in the network device or used in conjunction with the network device. In this embodiment, the example of a network device being used to implement the functions of a network device is provided only and does not constitute a limitation on the solutions described in this embodiment.

[0086] Network devices and / or terminal devices can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; they can also be deployed on water; and they can also be deployed in the air on airplanes, balloons, and satellites. This application does not limit the scenario in which the network devices and terminal devices are located. Furthermore, terminal devices and network devices can be hardware devices, or software functions running on dedicated hardware, or software functions running on general-purpose hardware, such as virtualization functions instantiated by a platform (e.g., a cloud platform), or entities that include dedicated or general-purpose hardware devices and software functions. This application does not limit the specific form of the terminal devices and network devices.

[0087] The solution provided in this application can be applied to the field of satellite communications, for example, the integration of satellite communications and 5G technologies by members of the 3rd Generation Partnership Project (3GPP). Figure 2 The network application architecture 200 of this technology is illustrated. For example... Figure 2 As shown, the network application architecture 200 may include at least one terminal device (e.g., terminal device 201 and terminal device 202), at least one network device (e.g., satellite 203 and satellite 204 deploying 5G base stations, and ground station 205), and core network elements (e.g., 5G control plane (5G access and mobility management function (AMF), 5G session management function (SMF)) and 5G user plane function (UPF)). The ground station may be referred to as a gateway station, signal gateway station, etc.

[0088] Specifically, terminal device 201 accesses satellite 203 via an air interface (e.g., 5G New Radio), terminal device 202 accesses satellite 204 via a 5G New Radio, satellite 203 and satellite 204 can communicate wirelessly via the Xn interface, satellite 203 and ground station 205 can communicate wirelessly via the NG interface, ground station 205 and core network elements (e.g., 5G UPF, 5G AMF and 5GSMF) can communicate wirelessly via the NG interface, and core network elements (e.g., 5G UPF) and data network can communicate wirelessly via the N6 interface.

[0089] in, Figure 2 The descriptions of each network element are as follows:

[0090] Terminal equipment: Mobile devices that support satellite communication can access the satellite network via air interface and initiate services such as making calls and accessing the Internet. The terminal equipment can be any of the aforementioned possible terminals.

[0091] Network equipment: can provide wireless access services, allocate wireless resources to access terminal devices, and provide reliable wireless transmission protocols and data encryption protocols, etc. The network equipment can be any of the aforementioned possible network equipment.

[0092] Ground station: Responsible for relaying signaling and service data between satellites and the core network.

[0093] AMF: It can be used to manage user access, security authentication, and mobility management.

[0094] UPF: It can be used to manage the transmission of user plane data, traffic statistics, etc.

[0095] SMF: Can be used to handle interactions with the data plane, creating, updating, and deleting sessions.

[0096] In order to better understand the methods provided in this application, the terms involved in this application will be briefly explained below.

[0097] 1. SSB burst pattern: The steps for terminal equipment to determine the SSB burst pattern of a cell:

[0098] Step 1: Determine pattern A to G (3GPP TS.38213) based on the subcarrier spacing of the synchronization signal (SS) / physical broadcast channel block (PBCH block);

[0099] Step 2: Determine the actual number of SSBs transmitted in the burst for this mode based on the SSB positions in the RRC parameters;

[0100] Step 3: Determine the SSB scan period based on the SSB periodicity of the serving cell according to the RRC parameters.

[0101] In summary, the SSB burst mode can include the following characteristics: the burst period of the SSB, the burst time-domain location of the SSB, and multiple SSB signals.

[0102] 2. SSB Burst Period: The time interval for network devices to transmit SSBs. For example, common SSB burst periods (or traditional SSB periodicity) are 5ms, 10ms, 20ms, 40ms, 80ms, etc.

[0103] 3. SSB burst cycle expansion factor: This means multiplying the duration of the traditional SSB burst cycle by a factor to expand it into a larger or smaller duration.

[0104] 4. Time-domain offset of SSB burst mode: This indicates the time-domain offset by which the 5ms transmission window of the traditional SSB burst mode is delayed or advanced in the time domain. It is not limited to being expressed by a multiple or by directly indicating the time length.

[0105] 5. Beam-hopping: To support wide-area coverage, a single satellite typically needs to be equipped with hundreds or even thousands of beams. To alleviate the contradiction between small payload capacity and wide coverage area, beam-hopping satellite communication systems have emerged. Specifically, in a beam-hopping satellite system, a single satellite is equipped with only a small number of beams (such as dozens of beams), and these beams serve all the coverage areas of the single satellite in a time-division manner.

[0106] In the discussion of satellite coverage enhancement in NTN Release 19 (R-19), limitations were specified on the total power of the satellite payload and the number of active beams. Based on these limitations, the satellite needs to provide time-division hopping beam service among numerous (e.g., 1058) downlink positions using a limited number of active beams. That is, the satellite stays on certain positions for a period of time, transmitting downlink common signals (e.g., SSB, System Information Block Type 1 (SIB1), SIB19, etc.) and downlink data scheduling (e.g., Physical Downlink Shared Channel (PDSCH), Physical Downlink Control Channel (PDCCH), etc.), and then turns off the beam for that position after the dwell time ends (i.e., the beam no longer provides downlink transmission for that position).

[0107] 6. Dwell Time: A system term used in beam hopping, indicating the duration for which a specific active beam of a satellite continuously transmits / illuminates / sends / receives in a particular cell / position. After this duration, the active beam switches to another cell / position to provide service via beamforming.

[0108] 7. Revisit time: A system term for hopping beams, indicating the interval between when an active beam returns to the same beam for service / transmission after it has finished serving cell / bench-i (where i is a positive integer).

[0109] Satellites have a large coverage area, and according to the beamwidth assumptions defined by 3GPP, there will be a large number of wavelengths (S-band, 1058 wavelengths) within the coverage area. For network planning, there are two different possible configurations.

[0110] 1) Single-satellite multi-cell: In this scenario, the number of wavelengths per cell can be reasonably controlled within the range allowed by the NR protocol (e.g., 4 wavelengths in the S-band). However, this increases the handover overhead for terminal equipment and the network side, as well as the physical cell identifier (PCI) conflict problem in constellation networking.

[0111] 2) Single satellite, single cell: This scenario requires increasing the number of synchronization signal block indexes (SSB indexes) supported by the NR cell, or other designs are needed to support the reuse of a limited number of SSB indexes within a single cell.

[0112] In existing standards, each cell has an independent set of SSB burst modes. In a single-satellite, multi-cell scenario, each cell has an independent SSB burst mode configuration, which can adapt to different frequency bands (or areas with different service types). In a single-satellite, single-cell scenario, all frequency bands will use the same SSB burst mode configuration, and all connected terminal devices will be configured with the same SSB scan cycle by the system information block (SIB) in the RRC.

[0113] Currently, when the traffic volume or density of connected terminal devices in a satellite cell changes, the network device will issue an RRC release to the connected terminal device, and the terminal device needs to reconnect to the network. However, this method increases the signaling overhead of the system.

[0114] In view of this, this application provides an NTN communication method in which a network device can send a handover message to a terminal device. This handover message indicates a change in the SSB scanning state corresponding to a specific spectral position within the cell. Upon receiving the handover message, the terminal device can switch its SSB reception state. This way, the network device does not need to release the terminal device, and the terminal device does not need to re-access the network, thus reducing system signaling overhead.

[0115] The method provided in this application will now be described in detail with reference to the accompanying drawings. It should be understood that the technical solution of this application can be applied to, for example... Figure 1 The communication system shown and Figure 2 In the network application architecture shown.

[0116] In the embodiments illustrated in the following figures, the various processes are described using the interaction process between a terminal device and a network device as an example, but this should not constitute any limitation on the subject of this application. For example, the terminal device can also be replaced by components configured in the terminal device, such as chips, chip systems, or other modules that can be used to implement some or all of the functions of the terminal device; the network device can also be replaced by components configured in the network device, such as chips, chip systems, or other modules that can be used to implement some or all of the functions of the network device.

[0117] Figure 3 An NTN communication method 300 provided in an embodiment of this application is illustrated. The method 300 includes steps 310 to 330. The various steps in method 300 are described in detail below.

[0118] In step 310, the network device acquires first information, which is used to indicate that the SSB scan state corresponding to the first wave position has switched.

[0119] In this application, the SSB scan status can be determined based on the SSB burst cycle and the SSB burst time domain location, or in other words, the SSB scan status includes the SSB burst cycle, the SSB burst time domain location, etc., without limitation.

[0120] The first wave position mentioned above can be the first wave position of the first type (e.g., it can be called the N3 type) or the first wave position of the second type (e.g., it can be called the N2 type).

[0121] In the N3 type, the SSB burst mode corresponding to the first wave position is the first burst mode, and the SSB burst period in this first burst mode is a short period, for example, the SSB burst period is 20ms. This type of wave position has high traffic volume, or in other words, high bandwidth. Therefore, the SSB scan frequency corresponding to this type of wave position is high, or in other words, the SSB scan state corresponding to this type of wave position is a dense SSB scan state. For example, this SSB scan state can be called the N3 type SSB scan state (hereinafter referred to as the N3 state). The SSB burst mode corresponding to the first wave position of the N2 type is the second burst mode, and the SSB burst period in the second burst mode is a long period, for example, the SSB burst period is 40ms. This type of wave position has low traffic volume, or in other words, low bandwidth. Therefore, the SSB scan frequency corresponding to this type of wave position is low, or in other words, the SSB scan state corresponding to this type of wave position is sparse SSB scan state. For example, this SSB scan state can be called the N2 type SSB scan state (hereinafter referred to as the N2 state). No further limitations are imposed on this.

[0122] The switching of the SSB scan state corresponding to the first wave position can be due to the following: the burst period of the SSB corresponding to the first wave position changes (e.g., from 20ms to 40ms), and / or the burst time domain position of the SSB corresponding to the first wave position changes (e.g., delayed or advanced by a certain time domain offset), and / or the SSB index corresponding to the first wave position changes.

[0123] In this application, the network device obtains the first information, for example, by determining the first information or by generating the first information, without limitation.

[0124] Optionally, the network device may obtain the first information based on the information sent by the terminal device or the information recorded by the first timer, without limitation.

[0125] In one possible implementation, the terminal device sends third information to the network device, which indicates the traffic in the first bit, or the delay information in the first bit. Correspondingly, the network device receives the third information from the terminal device.

[0126] In one possible example, the network device can switch the SSB scan state corresponding to the first wave bit based on the traffic (or service volume) in the first wave bit, i.e., obtain the first information. For example, when the traffic in the first wave bit is greater than the threshold Δ1, the network device can switch the sparse SSB scan state corresponding to the first wave bit to the dense SSB scan state.

[0127] In another possible example, the network device can switch the SSB scan state corresponding to the first wave bit based on the latency information (or latency coefficient) (e.g., scheduling latency) in the first wave bit, i.e., obtain the first information. For example, when the median scheduling latency in the first wave bit is greater than the threshold Δ2, the network device can switch the sparse SSB scan state corresponding to the first wave bit to the dense SSB scan state.

[0128] In another possible implementation, the terminal device sends a second message to the network device, which is a request from the terminal device to the network device to switch the SSB scan state. Correspondingly, the network device receives the second message from the terminal device.

[0129] It should be understood that in this implementation, network devices can reserve channel resources for uplink trigger signals in advance, such as the physical uplink control channel (PUCCH) or alerts.

[0130] In one possible example, the network device can switch the SSB scan state corresponding to the first wavelet based on the amount of second information, i.e., acquire the first information. For example, when the amount of second information is greater than a threshold Δ3, the network device can switch the sparse SSB scan state corresponding to the first wavelet to a dense SSB scan state.

[0131] For example, Figure 4 The diagram illustrates a terminal device requesting a switch of SSB scan status, as shown below. Figure 4 As shown, the black cuboid represents the activation beam (AB)1 residing in the first wavelength scan, while the dashed cuboid represents AB1 residing in other wavelength scans.

[0132] The first wavelet is of type N2, and the SSB burst period is P = x * 20 ms, where x is the period spread factor (e.g., if x = 3, then P = 60 ms). AB1 is responsible for scanning the first wavelet, and the corresponding SSB scan state is N2. In the N2 state, AB1 stays at the first wavelet every 60 ms to scan. Within a 60 ms scan cycle, after AB1 has scanned the first wavelet, it can scan other wavelets every 20 ms (e.g., ...). Figure 4The four consecutive dashed cuboids in the N2 type wavelet represent the wavelets. After n N2 state cycles, the terminal device sends an uplink request message (e.g., the second information) through an uplink trigger, requesting the network device to switch the SSB scan state of the first wavelet, for example, from N2 state to N3 state. The first wavelet in the N3 state is an N3 type wavelet, and the SSB burst period is 20ms. In the N3 state, AB1 camps on the first wavelet every 20ms to perform a scan.

[0133] In another possible implementation, the network device can switch the SSB scanning state corresponding to the first hop based on the time interval for revisiting the first hop based on the hop beam recorded by the first timer, that is, the network device obtains the first information.

[0134] For example, if the time interval between the hop beam revisiting the first position recorded by the first timer is less than the threshold Δ4, the network device can switch the sparse SSB scan state corresponding to the first position to the dense SSB scan state.

[0135] In this application, the first information can be used to indicate at least one of the following: the first spread factor of the first burst period of the first SSB corresponding to the first wave position, the first time domain offset of the first burst time domain position of the first SSB, the index of the first SSB, and the start time of the SSB scan state after switching.

[0136] It should be understood that the first burst period of the first SSB can be the SSB burst period corresponding to the SSB scan state before the handover, and the first burst time domain position of the first SSB can be the start time domain position of the SSB scan corresponding to the SSB scan state before the handover. The first expansion factor can be used to expand the first burst period of the first SSB to the SSB burst period corresponding to the SSB scan state after the handover, and the first time domain offset can be used to time-domain offset the first burst time domain position of the first SSB. The offset second burst time domain position can correspond to the start time domain position (or start time) of the SSB scan state after the handover. The index of the first SSB can be the identifier of the SSB corresponding to the SSB scan state after the handover at a specific frequency domain and time domain position.

[0137] For example, Figure 5 A schematic diagram showing the change in SSB scan state corresponding to the wave position is shown, such as... Figure 5 As shown, Figure 5 In the example, (a) activation beam (AB)2 is responsible for scanning wave position 7 (b7), which is in state N3 (e.g., SSB burst period is 20ms), and AB3 is responsible for scanning wave position 4 (b4), which is in state N2 (e.g., SSB burst period is 40ms). Figure 5(b) visually illustrates that AB2 and AB3 scan different beams based on different SSB scanning states. At a certain moment, the service states of b4 and b7 change. The service volume of b7 decreases, so it can switch from state N3 to state N2. Meanwhile, the service volume of beam b4 increases, so it can switch from state N2 to state N3. Assuming the satellite has only two active beams that can operate simultaneously, namely AB3 and AB2, when beam b7 switches from a short period to a long period (which can be understood as switching from AB2 service to AB3 service), the SSB burst period and SSB index (e.g., SSB2) corresponding to beam b7 may both need to change. When beam b4 switches from a short period to a long period (which can be understood as switching from AB3 service to AB2 service), the SSB burst period and SSB index (e.g., SSB3) corresponding to beam b4 may both need to change.

[0138] It should be understood that the first wave position in this embodiment can be Figure 5 The value of b7 or b4 is not specified.

[0139] Optionally, the SSB burst cycle corresponding to the SSB scan state before the switch is a preset cycle, or it can be determined through a variety of possible implementation methods.

[0140] In the first possible implementation, the SSB burst period corresponding to the SSB scan state before the handover is determined based on the SSB burst period configured for the first wave position within the historical time period.

[0141] The aforementioned historical time period can be configured as the SSB burst cycle of the first wave in the previous month, for example, the wave type of the first wave in this historical time period is N2 type or N3 type.

[0142] In the second possible implementation, the SSB burst period corresponding to the SSB scan state before handover is determined based on the second spreading factor. The second spreading factor is used to extend the preset period, and the network device can indicate the second spreading factor to the terminal device in various ways.

[0143] In one possible example, the second expansion factor is, for example, α, and the value of α can be:

[0144]

[0145] Where α represents the expansion factor, T represents the total number of wavelengths within a satellite cell. dwell This indicates the duration of continuous residence of an active beam at a given wavelength. P represents the total number of active beams for the satellite. legacy This indicates the traditional SSB scan cycle.

[0146] In another possible example, the network device indicates the second spreading factor and / or the second time-domain offset of the SSB burst time-domain location corresponding to the SSB scan state before the handover to the terminal device.

[0147] In one possible implementation, the second time-domain offset of the SSB burst time-domain position corresponding to the aforementioned second expansion factor and / or the SSB scan state before the switch can be carried by a MIB message.

[0148] For example, the MIB message described above may include two bits, such as one bit being a 1 MIB reserved bit and the other bit being... No restrictions are imposed on this.

[0149] In one possible scenario, these two bits can be used to indicate different spread factors (e.g., a second spread factor or other spread factors) of the SSB burst cycle corresponding to the SSB scan state before the switch.

[0150] For example, the expansion factor can be β. When the two bits represent a value of 00, it can correspond to β=1; when the two bits represent a value of 01, it can correspond to β=2; when the two bits represent a value of 10, it can correspond to β=4; and when the two bits represent a value of 11, it can correspond to β=8.

[0151] In another possible scenario, these two bits can be used to indicate different time-domain offsets (e.g., a second time-domain offset or other time-domain offsets) of the SSB burst time-domain position corresponding to the SSB scan state before the switch.

[0152] For example, the time-domain offset can be λ. When two bits are 00, it corresponds to λ=5; when two bits are 01, it corresponds to λ=10; when two bits are 10, it corresponds to λ=15; and when two bits are 11, it corresponds to λ=20.

[0153] In another possible scenario, the first significant bit of the two bits, for example, the most significant bit (MSB), is used to enable the spread factor of the SSB burst period corresponding to the SSB scan state before the switch; the second significant bit of the two bits, for example, the least significant bit (LSB), is used to enable the time-domain offset of the SSB burst time-domain position corresponding to the SSB scan state before the switch.

[0154] For example, when the two bits represent a value of 00, the MSB is 0, indicating that the scan factor β is disabled; the LSB is 0, indicating that the delay offset λ is disabled. When the two bits represent a value of 01, the MSB is 0, indicating that the scan factor β is disabled; the LSB is 1, indicating that the delay offset λ is enabled. When the two bits represent a value of 10, the MSB is 1, indicating that the scan factor β is enabled; the LSB is 0, indicating that the delay offset λ is disabled. When the two bits represent a value of 11, the MSB is 1, indicating that the scan factor β is enabled; the LSB is 1, indicating that the delay offset λ is enabled.

[0155] In another possible implementation, the second time-domain offset of the second expansion factor and / or the SSB burst time-domain position corresponding to the SSB scan state before the switch can be carried by a beam-level broadcast message.

[0156] In another possible implementation, the second time-domain offset of the SSB burst time-domain position corresponding to the second expansion factor and / or the SSB scan state before the switch can be carried by DCI.

[0157] In this implementation, the network device needs to configure multiple periodic spread factors (e.g., a second spread factor and other spread factors) and / or multiple time-domain offsets (e.g., a second time-domain offset and other time-domain offsets) in advance in the SIB message.

[0158] In step 320, the network device sends first information to the terminal device. Correspondingly, the terminal device receives the first information from the network device.

[0159] In one possible scenario, the aforementioned first information can be carried by RRC signaling, or in other words, it can be sent through RRC configuration.

[0160] In another possible scenario, the aforementioned first information can be carried via DCI.

[0161] In step 330, the terminal device switches the reception state of the SSB corresponding to the first wavelet based on the first information.

[0162] The aforementioned SSB reception status can refer to the terminal device receiving SSBs based on the SSB burst period corresponding to the SSB scan status after the handover.

[0163] Based on the above scheme, the network device can send first information to the terminal device. This first information indicates that the SSB scanning state corresponding to a wavelet (e.g., the first wavelet) has switched, so that the terminal device can switch its SSB reception state in a timely manner, that is, receive SSBs based on the SSB burst period corresponding to the switched SSB scanning state. Therefore, when the network device switches the SSB scanning state of a wavelet (e.g., the first wavelet), it does not need to release the terminal device, nor does the terminal device need to reconnect to the network. This saves system signaling overhead.

[0164] Figure 5 The communication method 500 shown is based on the switching of the SSB scan state corresponding to the wave position determined by the network device. The SSB scan state corresponding to the wave position can also be switched periodically and automatically.

[0165] For example, Figure 6 An NTN communication method 600 provided in an embodiment of this application is illustrated. The method 600 includes steps 610 to 630. The various steps in method 600 are described in detail below.

[0166] In step 610, the network device configures duration information, which is used to indicate the duration of the SSB scan state corresponding to the second wave bit.

[0167] In one possible scenario, the duration information is indicated using a timer.

[0168] For example, this duration information can be used to indicate M (M is a positive integer) SSB scan states, which are indicated by a timer, called the SSB scan state timer. When the SSB scan state timer expires, the SSB scan state corresponding to the second wave bit can be automatically switched.

[0169] For example, Figure 7 A schematic diagram showing the configuration of timers in the waveform is shown, such as... Figure 7 As shown, the black cuboid indicates that the active beam AB8 is stationed in the second wave position scan, and the dashed cuboid indicates that AB8 can be stationed in other wave position scans.

[0170] In this system, the second wavelet is of type N3, with an SSB burst period of P = 20ms. AB8 is responsible for scanning the second wavelet, and its corresponding SSB scan state is N3. In N3 state, AB8 stays on the second wavelet every 20ms to scan. After n N3 state cycles, the network device switches the SSB scan state corresponding to the second wavelet from N3 to N2 state via a network trigger. The second wavelet in N2 state is of type N2, with a corresponding SSB burst period of x * 20ms, where x is the period spread factor (e.g., if x = 3, the SSB burst period is 60ms). In N2 state, AB8 stays on the second wavelet every 60ms to scan. Within a 60ms scan cycle, after AB8 finishes scanning the second wavelet, it can scan other waves every 20ms (e.g., ...). Figure 7 The N2 type wavelet represents four consecutive dashed cuboids. Network devices can configure an SSB scan state timer for this N2 state wavelet, i.e., configure the duration of the N2 state. For example, after M N2 states, or when the N2 state timer expires, the SSB scan state of the second wavelet automatically switches from N2 to N3. The second wavelet in N3 state is an N3 type wavelet, with an SSB burst period of 20ms. In N3 state, AB8 resides on the second wavelet every 20ms to scan.

[0171] In step 620, the network device sends duration information to the terminal device. Correspondingly, the terminal device receives the duration information from the network device.

[0172] In one possible scenario, the aforementioned duration information can be carried via RRC signaling, or in other words, it can be distributed via RRC configuration.

[0173] In another possible scenario, the aforementioned duration information can be carried via DCI.

[0174] In step 630, when the duration indicated by the duration information is reached, the terminal device switches the SSB reception state corresponding to the second wave bit.

[0175] The duration indicated by the aforementioned duration information is, for example, the timer expires. When the timer expires, the SSB scanning state corresponding to the second wave bit changes. The terminal device can switch the SSB receiving state corresponding to the second wave bit, or in other words, it can receive SSB based on the SSB burst period corresponding to the switched SSB scanning state.

[0176] Based on the above scheme, the network device can send duration information to the terminal device. This duration information indicates the duration of the SSB scan state corresponding to the second wave bit, so that the terminal device can switch the SSB reception state corresponding to the second wave bit when the duration indicated by the duration information is reached. This notification method for SSB scan state switching is relatively simple and can save system signaling overhead.

[0177] In a single-satellite, single-cell satellite scenario, all wavelengths will use the same SSB burst mode configuration, and all connected terminal devices will be configured with the same SSB scan cycle by the SIB in the RRC. However, network devices cannot flexibly configure different burst modes for different wavelengths (or areas) within the satellite coverage area (due to differences in population density, terminal device type, service distribution, etc.), which is detrimental to optimal resource utilization. Therefore, embodiments of this application provide a wavelength-level SSB burst mode.

[0178] For example, Figure 8 An NTN communication method 800 provided in an embodiment of this application is illustrated. The method 800 includes steps 810 to 830. The various steps in method 800 are described in detail below.

[0179] In step 810, the network device acquires fourth information, which is used to indicate the third spread factor of the third burst period of the third SSB corresponding to the wavelength of the terminal device, and / or the third time-domain offset of the third burst time-domain position of the third SSB.

[0180] The third burst cycle and the third burst time domain position of the third SSB mentioned above can be characteristics of the first burst mode of the third SSB corresponding to the wavelength where the terminal device is located.

[0181] The aforementioned third expansion factor can be used to expand the third burst cycle into a burst cycle that is larger or smaller than the third burst cycle; the third time domain offset can be used to shift the time domain position of the third burst of the third SSB forward or backward by a certain time domain position, or in other words, to shift the burst mode of the third SSB forward or backward by a certain time domain position.

[0182] For example, the value range of the third time-domain offset mentioned above can be [5, 20] ms, and there is no limitation thereto.

[0183] Optionally, before step 810, the terminal device can perform a blind SSB check to obtain system messages.

[0184] Blind Detection SSB is a step performed by a terminal device when it initially accesses the network or re-accesses the network while moving. A successful blind detection SSB can enable the terminal device to obtain synchronization information and system broadcast information, thereby establishing a connection with the network.

[0185] Terminal equipment can identify SSB burst patterns (e.g., traditional SSB burst patterns) by blindly detecting SSBs. The characteristics of the SSB burst pattern may include subcarrier spacing (SCS), the position of the SSB in the burst (e.g., the time domain position of the third burst of the third SSB), and the burst period of the serving cell's SSB (e.g., the third burst period of the third SSB).

[0186] In this application, the network device obtains the fourth information, for example, the network device determines the first information or the network device generates the fourth information, and there is no limitation on this.

[0187] In step 820, the network device sends fourth information to the terminal device. Correspondingly, the terminal device receives the fourth information from the network device.

[0188] In this application, the aforementioned fourth information can be carried in different signaling messages, as shown below.

[0189] In one possible implementation, the aforementioned fourth information can be carried through a MIB message.

[0190] For example, the MIB message described above may include two bits, such as one bit being a 1 MIB reserved bit and the other bit being... No restrictions are imposed on this.

[0191] In one possible scenario, these two bits can be used to indicate different spread factors of the third burst cycle (e.g., the third spread factor or other spread factors).

[0192] For example, the expansion factor can be β. When the two bits represent a value of 00, it can correspond to β=1; when the two bits represent a value of 01, it can correspond to β=2; when the two bits represent a value of 10, it can correspond to β=4; and when the two bits represent a value of 11, it can correspond to β=8.

[0193] In another possible scenario, these two bits could be used to indicate a different time-domain offset of the third burst's time-domain location (e.g., a third time-domain offset or other time-domain offsets).

[0194] For example, the time-domain offset can be λ. When two bits are 00, it corresponds to λ=5; when two bits are 01, it corresponds to λ=10; when two bits are 10, it corresponds to λ=15; and when two bits are 11, it corresponds to λ=20.

[0195] In another possible scenario, the first significant bit of the two bits, for example the most significant bit (MSB), is used to indicate the enable of the spread factor of the third burst period; the second significant bit of the two bits, for example the least significant bit (LSB), is used to indicate the enable of the time-domain offset of the time-domain position of the third burst.

[0196] For example, when the two bits represent a value of 00, the MSB is 0, indicating that the scan factor β is disabled; the LSB is 0, indicating that the delay offset λ is disabled. When the two bits represent a value of 01, the MSB is 0, indicating that the scan factor β is disabled; the LSB is 1, indicating that the delay offset λ is enabled. When the two bits represent a value of 10, the MSB is 1, indicating that the scan factor β is enabled; the LSB is 0, indicating that the delay offset λ is disabled. When the two bits represent a value of 11, the MSB is 1, indicating that the scan factor β is enabled; the LSB is 1, indicating that the delay offset λ is enabled.

[0197] In another possible implementation, the aforementioned fourth information can be carried by a beam-level broadcast message.

[0198] In another possible implementation, the aforementioned fourth information can be carried by DCI.

[0199] In this implementation, the network device needs to configure multiple periodic spread factors and / or multiple time-domain offsets in the SIB message in advance.

[0200] In step 830, the terminal device determines the fourth burst period of the third SSB corresponding to the wavelength position where the terminal device is located, and / or the time domain position of the fourth burst of the third SSB, based on the fourth information.

[0201] The fourth burst period of the aforementioned third SSB is obtained by multiplying the third burst period of the third SSB by the third spread factor. The fourth burst period can be a burst period larger or smaller than the third burst period. The time-domain position of the fourth burst of the third SSB is obtained by shifting the time-domain position of the third burst of the third SSB forward or backward by the third time-domain offset.

[0202] The fourth burst cycle and / or the time domain position of the fourth burst of the third SSB can be a feature of the second burst mode of the third SSB corresponding to the wavelength where the terminal device is located.

[0203] Based on the above scheme, network devices can send the spread factor of the SSB burst period corresponding to their current wavelength (e.g., the third spread factor of the third burst period of the third SSB) and / or the time domain offset of the SSB burst time domain position (e.g., the third time domain offset of the third burst time domain position of the third SSB) to the terminal devices to configure the wavelength-level SSB burst mode. In this way, the system resource utilization can be improved with less signaling overhead.

[0204] For example, Figure 9 A schematic diagram showing the wave positions in different regions within the satellite coverage area is shown, such as... Figure 9 As shown, in a single-satellite, single-cell scenario, the wave positions in different areas within the satellite's coverage area can be categorized into different wave position types, for example, Figure 9 SSB0, SSB1, SSB3, SSB4, or other SSBs are transmitted using type N3 wavelets, while SSB4, SSB5, SSB6, SSB7, and other SSBs are transmitted using type N2 wavelets.

[0205] by Figure 9 Based on the scenario shown, exemplarily, Figure 10 The SSB burst modes corresponding to different wavelengths are shown, such as Figure 10 As shown, the wave position within a satellite subcell can be divided into three different SSB burst modes.

[0206] Among them, the active beam responsible for scanning N3 type wave positions is, for example, AB4, and the N3 type wave positions (e.g., Figure 10 In the diagram, b1, b2, b3, and b4 are used. Network devices can transmit SSB0 via b1, SSB1 via b2, SSB2 via b3, and SSB3 via b4. The first burst mode of the SSB is used, where the SSB burst period is short, for example, 20ms. Therefore, the SSB scan state corresponding to this wave position is N3. AB4 scans b1, b2, b3, and b4 every 20ms.

[0207] The active beams responsible for scanning N2 type wave positions are, for example, AB5 and AB6, and the N2 type wave positions (e.g., Figure 10The network device can transmit SSB4 via b5, SSB5 via b6, SSB6 via b7, and SSB7 via b8; and SSB8 via b9, SSB9 via b10, SSB10 via b11, and SSB11 via b12. It uses the second burst mode of SSBs, where the burst period is a long period X, for example, X = 80ms. Therefore, the SSB scan state corresponding to this wavelet is N2. AB5 scans b5, b6, b7, and b8 every 80ms. Within an 80ms scan cycle, after scanning b5, b6, b7, and b8, AB5 can scan other wavelets every 20ms (e.g., ...). Figure 10 (b13, b14, b15, b16, b17, b18, b19, and b20). AB6 scans b9, b10, b11, and b12 every 80ms. After scanning b9, b10, b11, and b12, within an 80ms scan cycle, AB6 can scan other wavelengths every 20ms (e.g., ...). Figure 10 (b21, b22, b23, b24, b25, b26, b27, and b28).

[0208] The active beam responsible for scanning N2' type wave positions is, for example, AB7, and the N2' type wave positions (e.g., Figure 10 Among the b29, b30, b31, and b32, network devices can transmit SSB12 via b29, SSB13 via b30, SSB14 via b31, and SSB15 via b32. This utilizes the third burst mode of SSBs, where the SSB burst period is a long period Y, for example, Y = 60ms. The time domain position of the SSB burst in this third burst mode is compared to... Figure 10 The first burst mode corresponding to the N3 type waveform and the second burst mode corresponding to the N2 type waveform have a certain time domain offset (e.g., offset backward by 5ms). Therefore, the SSB scan state corresponding to this waveform is the N2' state. AB7 scans b29, b30, b31, and b32 every 60ms. Within a 60ms scan cycle, after AB7 finishes scanning b29, b30, b31, and b32 with a 5ms delay, it can scan other waveforms every 20ms (e.g., ...). Figure 10 (b32, b33, b34, and b34 in the text).

[0209] It should be understood that Figure 3 , Figure 6 or Figure 8The processes shown are merely examples and should not be construed as limiting the scope of this application. In other embodiments, these processes may include more or fewer steps.

[0210] It should also be understood that the sequence number of each process 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.

[0211] The communication method provided in the embodiments of this application has been described in detail above with reference to the accompanying drawings. The apparatus provided in the embodiments of this application will now be described in detail with reference to the accompanying drawings.

[0212] Figures 11 to 12 The diagram illustrates possible communication devices provided for embodiments of this application. These communication devices can be used to implement the functions of the terminal device or the network device in the above method embodiments, and thus can also achieve the beneficial effects of the above method embodiments.

[0213] This application provides a communication device such as Figure 11 As shown, the communication device 1100 includes a communication unit 1110 and a processing unit 1120. The communication unit 1110 can be used to perform receiving or sending actions, while the processing unit 1120 can be used to perform actions other than receiving and sending, such as generating information or messages, processing received information or messages, etc.

[0214] One possible design is that the communication device 1100 is used to achieve the above. Figure 3 , Figure 6 or Figure 8 The method embodiments shown illustrate the functionality of the network device in any of the embodiments. For example, the communication device can be a network device, a component configured in the network device (such as a chip, chip system, processor, etc.), or a logic module or software capable of implementing some or all of the functions of the network device.

[0215] For example, when the communication device 1100 is used to implement the function of the network device in method 300, the processing unit 1120 is used to acquire first information, the first information being used to indicate that the SSB scanning state corresponding to the first wave position has switched; the communication unit 1110 is used to send the first information.

[0216] Optionally, the first information is used to indicate at least one of the following: a first spread factor of the first burst period of the first SSB corresponding to the first wave position, wherein the first burst period is the period corresponding to the SSB scan state before the switch; a first time domain offset of the first burst time domain position of the first SSB; the index of the first SSB; and the start time of the SSB scan state after the switch.

[0217] Optionally, the first information is determined based on at least one of the following: the flow rate in the first waveband; the delay information of the first waveband; the time interval for hop beam revisiting the first waveband recorded by a first timer; and the quantity of second information, which is used to request a switch of the SSB scan state.

[0218] Optionally, the communication unit 1110 is further configured to receive third information, which indicates the flow rate in the first wave position or the delay information of the first wave position.

[0219] Optionally, the communication unit 1110 is also used to receive the second information.

[0220] Optionally, the SSB burst period corresponding to the SSB scan state before the switchover is a preset period, or is determined based on at least one of the following: the SSB burst period configured for the first wave position within a historical time period; a second spread factor; and a second time domain offset of the SSB burst time domain position corresponding to the SSB scan state before the switchover.

[0221] Optionally, the first information is carried via RRC signaling or via DCI.

[0222] For example, when the communication device 1100 is used to implement the function of the network device in method 600, the processing unit 1120 is used to configure duration information, which is used to indicate the duration of the SSB scan state corresponding to the second wave bit; the communication unit 1110 is used to send the duration information.

[0223] Optionally, the duration information is indicated by a timer.

[0224] Optionally, the duration information is carried via RRC signaling or via DCI.

[0225] For example, when the communication device 1100 is used to implement the function of the network device in method 800, the processing unit 1120 is used to obtain fourth information, which is used to indicate the third spread factor of the third burst period of the third SSB corresponding to the wavelength of the terminal device, and / or the third time domain offset of the third burst time domain position of the third SSB; the communication unit 1110 is used to send the fourth information.

[0226] Optionally, the fourth information is carried by a MIB message, or by a beam-level broadcast message; or by a DCI.

[0227] Optionally, the MIB message includes two bits, which are used to indicate at least one of the following: different spread factors of the third burst cycle; different time-domain offsets of the time-domain position of the third burst; a first valid bit of the two bits is used to indicate the enabling of the spread factor of the third burst cycle, and a second valid bit is used to indicate the enabling of the time-domain offset of the time-domain position of the third burst.

[0228] One possible design is that the communication device 1100 is used to achieve the above. Figure 3 , Figure 6 or Figure 8 The method embodiments shown illustrate the functions of the terminal device in any of the embodiments. For example, the communication device can be a terminal device, a component configured in the terminal device (such as a chip, chip system, processor, etc.), or a logic module or software capable of implementing some or all of the functions of the terminal device.

[0229] For example, when the communication device 1100 is used to implement the function of the terminal device in method 300, the communication unit 1110 is used to receive first information, the first information being used to indicate that the SSB scanning state corresponding to the first wave position has been switched; the processing unit 1120 is used to switch the SSB receiving state corresponding to the first wave position based on the first information.

[0230] Optionally, the first information is used to indicate at least one of the following: a first spread factor of the first burst period of the first SSB corresponding to the first wave position, wherein the first burst period is the period corresponding to the SSB scan state before the switch; a first time domain offset of the first burst time domain position of the first SSB; the index of the first SSB; and the start time of the SSB scan state after the switch.

[0231] Optionally, the first information is determined based on at least one of the following: the flow rate in the first waveband; the delay information of the first waveband; the time interval for hop beam revisiting the first waveband recorded by a first timer; and the quantity of second information, which is used to request a switch of the SSB scan state.

[0232] Optionally, the communication unit 1110 is also used to send third information, which is used to indicate the flow rate in the first wave position, or the delay information of the first wave position.

[0233] Optionally, the communication unit 1110 is also used to transmit the second information.

[0234] Optionally, the SSB burst period corresponding to the SSB scan state before the switch is a preset period, or is determined based on at least one of the following: the SSB burst period configured for the first wave position within a historical time period; a second spread factor; and a second time domain offset of the SSB burst time domain position corresponding to the SSB scan state before the switch.

[0235] Optionally, the first information is carried via RRC signaling or via DCI.

[0236] For example, when the communication device 1100 is used to implement the function of the terminal device in method 600, the communication unit 1110 is used to receive duration information; when the duration indicated by the duration information is reached, the processing unit 1120 is used to switch the SSB receiving state corresponding to the second wavelet.

[0237] Optionally, the duration information is indicated by a timer.

[0238] Optionally, the duration information is carried via RRC signaling or via DCI.

[0239] For example, when the communication device 1100 is used to implement the function of the terminal device in method 800, the communication unit 1110 is used to receive fourth information, the fourth information being used to indicate the third spread factor of the third burst period of the third SSB corresponding to the wavelength position where the terminal device is located, and / or the third time domain offset of the third burst time domain position of the third SSB; the processing unit 1120 is used to determine the fourth burst period of the third SSB corresponding to the wavelength position where the terminal device is located, and / or the fourth burst time domain position of the third SSB based on the fourth information.

[0240] Optionally, the fourth information is carried by a MIB message, or by a beam-level broadcast message; or by a DCI.

[0241] Optionally, the MIB message includes two bits, which are used to indicate at least one of the following: different spread factors of the third burst cycle; different time-domain offsets of the time-domain position of the third burst; a first valid bit of the two bits is used to indicate the enabling of the spread factor of the third burst cycle, and a second valid bit is used to indicate the enabling of the time-domain offset of the time-domain position of the third burst.

[0242] It should also be understood that the communication unit 1110 in the communication device 1100 can also be called a transceiver unit. The communication unit 1110 may include a transmitting module but not a receiving module. Alternatively, the communication unit 1110 may include a receiving module but not a transmitting module. Specifically, it depends on whether the above-described scheme performed by the communication device 1100 includes both transmitting and receiving actions. The receiving module can be used to perform the receiving action in the above-described scheme, and the transmitting module can be used to perform the transmitting action in the above-described scheme.

[0243] It is understood that the division of units in the above-described device is merely a logical functional division. Each function can correspond to a functional unit, or two or more functions can be integrated into one functional unit. In actual implementation, all or some units can be integrated into a single physical entity, or they can be distributed across different physical entities. Furthermore, the aforementioned functional units can be implemented in hardware, software, or a combination of both. Whether a function is executed in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0244] Another communication device provided in this application is such as Figure 12 As shown, the communication device 1200 includes at least one processor 1210. The at least one processor 1210 can be used to execute computer programs or instructions stored in memory to achieve... Figure 3 , Figure 6 or Figure 8 The steps performed by the network device or terminal device in any of the embodiments of the method shown.

[0245] Optionally, the communication device 1200 may further include at least one memory 1220 for storing instructions executed by the processor 1210, or storing input data required by the processor 1210 to execute instructions, or storing data generated after the processor 1210 executes instructions. The at least one processor 1210 and the at least one memory 1220 may be configured separately. For example, each memory may be connected to one or more processors, enabling the connected processors to read information from, store, and / or write information to the memory. Alternatively, the at least one processor 1210 and the at least one memory 1220 may be integrated together; for example, one or more memories may be integrated into a single processor.

[0246] Optionally, the communication device 1200 further includes an interface circuit 1230 for transmitting data and / or signaling. The at least one processor 1210 and the interface circuit 1230 are coupled to each other. It is understood that the interface circuit 1230 can be a transceiver, input / output circuit, bus, module, pin, or other type of communication interface, wherein the input circuit in the input / output circuit can be used for receiving, and the output interface can be used for transmitting.

[0247] Optionally, the communication device 1200 may further include a power supply circuit 1240, which can be used to supply power to the communication device 1200.

[0248] When the communication device 1200 is used to implement Figure 3 , Figure 6 or Figure 8 When the method is performed in any of the embodiments shown in the method examples, the processor 1210 is used to execute the functions of the processing unit, and the interface circuit 1220 is used to execute the functions of the receiving unit and / or the transmitting unit. Whether the interface circuit 1220 is used for transmitting or receiving depends on whether the communication device 1200 is performing a transmitting or receiving action in the execution scheme.

[0249] It is understood that when the communication device 1200 is a communication device (e.g., a terminal device or a network device), the interface circuit 1220 can be a transceiver, specifically including a transmitter and a receiver. The transmitter is used to send signals, and the receiver is used to receive signals. When the communication device 1200 is a chip used in a communication device, the interface circuit 1220 can be an input / output circuit, a bus, a module, a pin, or other types of communication interface. The input circuit in the input / output circuit can be used for receiving, and the output interface can be used for sending.

[0250] It should be understood that Figure 12 In the communication device 1200 shown, the processor 1210 may correspond to the processing unit 1120 in the aforementioned communication device 1100, and the interface circuit 1220 may correspond to the communication unit 1110 in the aforementioned communication device 1100.

[0251] It should also be understood that the coupling in the embodiments of this application is an indirect coupling or communication connection between devices, units, or modules, which can be electrical, mechanical, or other forms, used for information interaction between devices, units, or modules. The embodiments of this application do not limit the specific connection medium between the at least one processor 1210, at least one memory 1220, interface circuit 1230, and power supply circuit 1240. The embodiments of this application in... Figure 12 The processor 1210, memory 1220, interface circuit 1230, and power supply circuit 1240 are connected via bus 1250. Bus 1250 is... Figure 12The connections between other components are shown in bold lines only and are not intended to be limiting. The bus can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, Figure 12 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0252] It is understood that the processor in the embodiments of this application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, transistor logic devices, hardware components, or any combination thereof. A general-purpose processor may be a microprocessor or any conventional processor.

[0253] The memory in this application embodiment can be volatile memory or non-volatile memory, or it can include both volatile and non-volatile memory. The non-volatile memory can be read-only memory (ROM), programmable read-only memory (PROM), erasable programmable read-only memory (EPROM), electrically erasable programmable read-only memory (EEPROM), or flash memory. The volatile memory can be random access memory (RAM), which is used as an external cache. By way of example, but not limitation, many forms of RAM are available, such as static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDRSDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous linked dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM). It should be noted that the memory used in the systems and methods described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0254] This application also provides a communication system, which includes the aforementioned network equipment and terminal equipment.

[0255] This application also provides a computer program product comprising: a computer program (also referred to as code or instructions), which, when executed, causes the computer to perform actions such as... Figure 3 , Figure 6 or Figure 8 The method executed by the network device or terminal device in the illustrated embodiment.

[0256] This application also provides a computer-readable storage medium storing a computer program (also referred to as code or instructions). When the computer program is executed, it causes the computer to perform actions such as... Figure 3 , Figure 6 or Figure 8 The method executed by the network device or terminal device in the illustrated embodiment.

[0257] The terms “unit”, “module”, etc., used in this specification may be used to refer to computer-related entities, hardware, firmware, combinations of hardware and software, software, or software in execution.

[0258] Those skilled in the art will recognize that the various illustrative logical blocks and steps described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application. In the several embodiments provided in this application, it should be understood that the disclosed apparatus, devices, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for example, the division of units is merely 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 shown or discussed mutual couplings or direct couplings or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms.

[0259] The unit described as a separate component may or may not be physically separate. The component shown as a unit may or may not be a physical unit; that is, it 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.

[0260] 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.

[0261] In the above embodiments, the functions of each functional unit can be implemented entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. This computer program product includes one or more computer instructions (programs). When the computer program instructions (programs) 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. The computer-readable storage medium can be any available medium accessible to a computer or a data storage device such as a server or data center that integrates one or more available media. The available media 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)).

[0262] If this function is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0263] 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. An NTN communication method, characterized in that, The method includes: Obtain first information, which is used to indicate that the scanning state of the synchronization signal block SSB corresponding to the first wave position has changed; Send the first message.

2. The method according to claim 1, characterized in that, The first information is used to indicate at least one of the following: The first expansion factor of the first burst period of the first SSB corresponding to the first wave position, wherein the first burst period is the period corresponding to the SSB scan state before the handover. The first time-domain offset of the first burst time-domain location of the first SSB; The index of the first SSB; The start time of the SSB scan state after switching.

3. The method according to claim 1 or 2, characterized in that, The first information is determined based on at least one of the following: The flow rate in the first wave position; The time delay information of the first wave position; The time interval between the skip beam revisiting the first position, recorded by the first timer; The quantity of the second information, which is used to request a switch of the SSB scan state.

4. The method according to claim 3, characterized in that, The method further includes: Receive third information, which is used to indicate the flow rate in the first wave position or the delay information of the first wave position.

5. The method according to any one of claims 1 to 4, characterized in that, The SSB burst cycle corresponding to the SSB scan state before the switchover is a preset cycle, or determined based on at least one of the following: The SSB burst cycle configured for the first wave position within the historical time period; Second expansion factor; The second time-domain offset of the SSB burst time-domain position corresponding to the SSB scan state before the switch.

6. The method according to any one of claims 1 to 5, characterized in that, The first information is carried by Radio Resource Control (RRC) signaling or by Downlink Control Information (DCI).

7. An NTN communication method, characterized in that, The method includes: Receive first information, which is used to indicate that the SSB scan state corresponding to the first wave position has been switched; Based on the first information, switch the SSB receiving state corresponding to the first wave position.

8. The method according to claim 7, characterized in that, The first information is used to indicate at least one of the following: The first expansion factor of the first burst period of the first SSB corresponding to the first wave position, wherein the first burst period is the period corresponding to the SSB scan state before the handover. The first time-domain offset of the first burst time-domain location of the first SSB; The index of the first SSB; The start time of the SSB scan state after switching.

9. The method according to claim 7 or 8, characterized in that, The first information is determined based on at least one of the following: The flow rate in the first wave position; The time delay information of the first wave position; The time interval between the skip beam revisiting the first position, recorded by the first timer; The quantity of the second information, which is used to request a switch of the SSB scan state.

10. The method according to claim 9, characterized in that, The method further includes: Send a third message, which indicates the flow rate in the first waveband, or the delay information of the first waveband.

11. The method according to any one of claims 7 to 10, characterized in that, The SSB burst cycle corresponding to the SSB scan state before the switchover is a preset cycle, or determined based on at least one of the following: The SSB burst cycle configured for the first wave position within the historical time period; Second expansion factor; The second time-domain offset of the SSB burst time-domain position corresponding to the SSB scan state before the switch.

12. The method according to any one of claims 7 to 11, characterized in that, The first information is carried via RRC signaling or via DCI.

13. An NTN communication method, characterized in that, The method includes: Receive duration information; When the duration indicated by the duration information is reached, the SSB reception state corresponding to the second wavelet is switched.

14. The method according to claim 13, characterized in that, The duration information is indicated by a timer.

15. The method according to claim 13 or 14, characterized in that, The duration information is carried via RRC signaling or via DCI.

16. An NTN communication method, characterized in that, The method includes: Obtain fourth information, which is used to indicate the third spread factor of the third burst period of the third SSB corresponding to the wavelength position of the terminal device, and / or the third time domain offset of the third burst time domain position of the third SSB. Send the fourth message.

17. The method according to claim 16, characterized in that, The fourth information is carried by the main broadcast channel information block (MIB) message, or by the beam-level broadcast message; or by the DCI.

18. The method according to claim 16 or 17, characterized in that, The MIB message includes two bits that indicate at least one of the following: The different expansion factors of the third burst cycle; The different time-domain offsets of the third burst's time-domain location; The first valid bit of the two bits is used to indicate the enabling of the spread factor of the third burst period, and the second valid bit is used to indicate the enabling of the time domain offset of the time domain position of the third burst.

19. An NTN communication method, characterized in that, The method includes: Receive fourth information, the fourth information being used to indicate the third spread factor of the third burst period of the third SSB corresponding to the wavelength position where the terminal device is located, and / or the third time domain offset of the third burst time domain position of the third SSB. Based on the fourth information, the fourth burst period of the third SSB corresponding to the wavelength position of the terminal device is determined, and / or the time domain position of the fourth burst of the third SSB is determined.

20. The method according to claim 19, characterized in that, The fourth information is carried through MIB messages, or through beam-level broadcast messages, or through DCI.

21. The method according to claim 19 or 20, characterized in that, The MIB message includes two bits that indicate at least one of the following: The different expansion factors of the third burst cycle; The different time-domain offsets of the third burst's time-domain location; The first valid bit of the two bits is used to indicate the enabling of the spread factor of the third burst period, and the second valid bit is used to indicate the enabling of the time domain offset of the time domain position of the third burst.

22. A communication device, characterized in that, It includes one or more functional units for implementing the method as described in any one of claims 1 to 21.

23. A communication device, characterized in that, Includes a processor for executing program code to cause the communication device to implement the method as described in any one of claims 1 to 21.

24. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, the method as described in any one of claims 1 to 21 is performed.

25. A computer program product, characterized in that, Includes a computer program, which, when run, causes the method as described in any one of claims 1 to 21 to be performed.

Images