Communication method and communication apparatus

Abstract

Provided in the present application are a communication method and a communication apparatus. The method comprises: receiving first synchronization signals, and receiving second synchronization signals, wherein the width of transmission beams for the first synchronization signals is greater than the width of transmission beams for the second synchronization signals, and the coverage ranges of the transmission beams for the first synchronization signals comprise the coverage ranges of the transmission beams for the plurality of second synchronization signals. In the method, by means of using wider beams to send first synchronization signals, the number of first synchronization signals covering a terminal device over a period of time is greater than the number of second synchronization signals covering the terminal device, thereby shortening the time required by the terminal device during an initial access process.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on January 5, 2024, with application number 202410029173.X and invention name “A Communication Method and Communication Device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and more particularly, to a communication method and a communication device. Background Art

[0003] Non-terrestrial networks (NTNs), such as satellite communications, have significant advantages such as global coverage, long-distance transmission, flexible networking, easy deployment, and freedom from geographical restrictions. They have been widely used in many fields, including maritime communications, positioning and navigation, disaster relief, scientific experiments, video broadcasting, and earth observation.

[0004] In non-terrestrial network scenarios, network devices and terminal devices need to align their beams for subsequent data transmission. During the beam alignment process, the network device transmits SSBs in different beam directions at a certain period, and the terminal device can adjust the direction of the receiving beam at a certain period to try to search for SSBs. When the network device needs to scan a large number of transmit beam directions, and the phased array terminal has a large number of optional receive beam directions, for example, up to hundreds of beam directions, the terminal device needs to complete beam scanning in a large number of directions before it can be aligned with the network device. Therefore, how to reduce the time required for the terminal device to access the initial access process is an urgent problem to be solved in this field. Summary of the Invention

[0005] The embodiments of the present application provide a communication method and a communication device, which can reduce the time required for the initial access of a terminal device.

[0006] In a first aspect, a communication method is provided, which includes: receiving a first synchronization signal; receiving a second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals.

[0007] In an embodiment of the present application, a terminal device receives a first synchronization signal and a second synchronization signal sent by a network device, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device, and then when the terminal device adjusts the direction of the receiving beam to try to receive the synchronization signal of the network device, it can search for the first synchronization signal more quickly than directly searching for the second synchronization signal, so that the receiving beam of the terminal device can be aimed at the network device more quickly, reducing the time required for the terminal device to access the network device more quickly.

[0008] In an embodiment of the present application, the first synchronization signal is transmitted using a wider beam than the second synchronization signal, which can increase the coverage range of the transmission beam of the first synchronization signal mapped on the ground, thereby reducing the time when the transmission beam cannot cover the location of the terminal device due to beam hopping, and preventing the terminal device from being unable to accurately point to the network device due to too long a time without beam service and thus failing to receive the downlink signal sent by the network device.

[0009] In combination with the first aspect, in some implementations of the first aspect, within a first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0010] Specifically, the first synchronization signal can be located in the first signal set, and the first signal set can be sent continuously and normally; the second synchronization signal can be located in the second signal set, and the second signal set can be sent periodically. Since the first synchronization signal is sent using a wide beam and the second synchronization signal is sent using a narrow beam, over a period of time, the number of transmission beams of the first synchronization signal covering the terminal device is greater than the number of transmission beams of the second synchronization signal covering the terminal device.

[0011] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal includes: receiving the second synchronization signal according to the received first synchronization signal.

[0012] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal based on the received first synchronization signal includes: receiving the second synchronization signal based on the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

[0013] In an embodiment of the present application, the terminal device receives a second synchronization signal based on the received first synchronization signal, and the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, compared with directly receiving the second synchronization signal, the terminal device can align with the network device more quickly, and then the terminal detects the second synchronization signal based on the alignment with the network device, reducing the time required for the terminal device in the initial access process.

[0014] In combination with the first aspect, in certain implementations of the first aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0015] In an embodiment of the present application, the terminal device can detect the second synchronization signal in the same frequency band as the center point of the frequency domain after detecting the first synchronization signal, thereby reducing the detection overhead of the terminal device.

[0016] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal includes a synchronization signal generated based on a physical cell identifier PCI or part of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or part of the PCI.

[0017] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal includes a primary synchronization signal PSS, and the second synchronization signal includes a secondary synchronization signal SSS.

[0018] It should be understood that the first synchronization signal may also be other forms of signals having the same function as the PSS, and the second synchronization signal may also be other forms of signals having the same function as the SSS and PBCH, and the embodiments of the present application are not limited to this.

[0019] In combination with the first aspect, in certain implementations of the first aspect, the sequence length of the PSS is greater than the sequence length of the SSS.

[0020] In the embodiment of the present application, since the beam width of PSS is greater than the beam width of SSS, and a wide beam will cause a loss of beam gain, the network device uses a sequence with a length greater than SSS when sending PSS, which can enable the terminal device to obtain a higher detection peak when detecting PSS, and increase the accuracy of the terminal device confirming the receipt of PSS, thereby enhancing the performance of beam alignment between the terminal device and the network device, and overcoming the loss of beam gain caused by a wide beam.

[0021] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization broadcast block SSB.

[0022] In combination with the first aspect, in certain implementations of the first aspect, receiving the second synchronization signal includes: receiving the second main synchronization signal in the SSB based on the received first main synchronization signal, the second main synchronization signal corresponds one-to-one to the first main synchronization signal, and the sequence of the second main synchronization signal is determined by the sequence of the first main synchronization signal.

[0023] Specifically, the first primary synchronization signal and the second primary synchronization signal may be the same or different. The first primary synchronization signal and the second primary synchronization signal may be sequences in different forms generated using the same information. The second primary synchronization signal may be determined by the first primary synchronization signal.

[0024] In an embodiment of the present application, since the second main synchronization signal corresponds one-to-one to the first main synchronization signal, and the sequence of the second main synchronization signal is determined by the sequence of the first main synchronization signal, that is to say, the terminal device can determine the information of the second main synchronization signal based on the information in the received first main synchronization signal, and thus the terminal device does not need to perform blind detection when receiving the second main synchronization signal, thereby saving the detection overhead of the terminal device.

[0025] In combination with the first aspect, in some implementations of the first aspect, a sequence length of the first primary synchronization signal is greater than a sequence length of the second primary synchronization signal.

[0026] In an embodiment of the present application, since the beam width of the first main synchronization signal is greater than the beam width of the second main synchronization signal, and the wide beam will cause a loss of beam gain, the network device uses a sequence with a length greater than the second main synchronization signal when sending the first main synchronization signal, which can enable the terminal device to obtain a higher detection peak when detecting the first main synchronization signal, increase the accuracy of the terminal device confirming receipt of the first main synchronization signal, thereby enhancing the performance of beam alignment between the terminal device and the network device, and overcoming the loss of beam gain caused by the wide beam.

[0027] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal further includes: receiving a secondary synchronization signal SSS in the SSB based on the received second primary synchronization signal.

[0028] Specifically, the SSS must exist after the narrow beam PSS. For example, the SSS can be located in the second symbol after the narrow beam PSS. Therefore, when the terminal device detects the SSS, it only needs to perform a blind detection at a certain time domain position to detect the SSS, saving the system overhead of the terminal device.

[0029] In the embodiment of the present application, when the terminal device detects the second main synchronization signal, it detects the second synchronization signal. Therefore, there must be SSS after the second main synchronization signal. Then, the terminal device avoids repeating the SSS blind detection operation to confirm whether a certain symbol is SSS, thereby reducing the blind detection overhead of the terminal device in detecting SSS.

[0030] In combination with the first aspect, in some implementations of the first aspect, the method further includes: receiving a physical broadcast channel PBCH according to the second primary synchronization signal and the SSS.

[0031] Specifically, the terminal device detects the PSS and SSS and Calculate N ID , parse the PBCH in the second synchronization signal, obtain the PBCH payload and MIB, further parse the SIB message, and the terminal device completes the initial access according to the MIB message and SIB message.

[0032] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal is repeatedly sent on multiple frequency bands.

[0033] Furthermore, the first synchronization signals repeatedly sent by the network device in multiple frequency domains may be of the same sequence, or may be different sequences carrying the same information.

[0034] In an embodiment of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause a loss of beam gain, the network device repeatedly sends the first synchronization signal on multiple frequency bands, which allows the terminal device to receive a larger number of first synchronization signals within a period of time, increasing the chance of the terminal device receiving the first synchronization signal with a power that meets the requirements, thereby reducing the time required for the terminal device during the initial access process.

[0035] In combination with the first aspect, in some implementations of the first aspect, receiving the second synchronization signal includes receiving the SSS in the second symbol after receiving the PSS.

[0036] In combination with the first aspect, in certain implementations of the first aspect, receiving the second primary synchronization signal in the SSB includes: receiving the second primary synchronization signal in the first symbol after receiving the first synchronization signal.

[0037] In combination with the first aspect, in certain implementations of the first aspect, receiving the secondary synchronization signal SSS in the SSB includes receiving the SSS in the second symbol after receiving the second primary synchronization signal.

[0038] In combination with the first aspect, in some implementations of the first aspect, the first synchronization signal is repeatedly sent in the time domain.

[0039] In a second aspect, a communication method is provided, including: sending a first synchronization signal; sending a second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals.

[0040] In combination with the second aspect, in some implementations of the second aspect, within the first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0041] In combination with the second aspect, in certain implementations of the second aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0042] In combination with the second aspect, in some implementations of the second aspect, the first synchronization signal includes a synchronization signal generated based on a physical cell identifier PCI or part of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or part of the PCI.

[0043] In combination with the second aspect, in some implementations of the second aspect, the first synchronization signal includes a first primary synchronization signal PSS, and the second synchronization signal includes a secondary synchronization signal SSS.

[0044] In combination with the second aspect, in certain implementations of the second aspect, a sequence length of the primary synchronization signal is greater than a sequence length of the secondary synchronization signal.

[0045] In combination with the second aspect, in certain implementations of the second aspect, the first synchronization signal includes a first primary synchronization signal PSS, the second synchronization signal includes a synchronization broadcast block SSB, the SSB includes a second primary synchronization signal, the second primary synchronization signal corresponds one-to-one to the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0046] In combination with the second aspect, in some implementations of the second aspect, a sequence length of the first primary synchronization signal is greater than a sequence length of the second primary synchronization signal.

[0047] In combination with the second aspect, in some implementations of the second aspect, sending the first synchronization signal includes: repeatedly sending the first synchronization signal on multiple frequency bands.

[0048] In a third aspect, a communication device is provided, which includes: a transceiver unit, which is used to receive a first synchronization signal; the transceiver unit is also used to receive a second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beam of multiple second synchronization signals.

[0049] In combination with the third aspect, in certain implementations of the third aspect, within a first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0050] In combination with the third aspect, in some implementations of the third aspect, receiving the second synchronization signal includes: receiving the second synchronization signal according to the received first synchronization signal.

[0051] In combination with the third aspect, in certain implementations of the third aspect, receiving the second synchronization signal based on the received first synchronization signal includes: receiving the second synchronization signal based on the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

[0052] In combination with the third aspect, in certain implementations of the third aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0053] In combination with the third aspect, in certain implementations of the third aspect, the first synchronization signal includes a synchronization signal generated based on a physical cell identifier PCI or part of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or part of the PCI.

[0054] In combination with the third aspect, in some implementations of the third aspect, the first synchronization signal includes a primary synchronization signal PSS, and the second synchronization signal includes a secondary synchronization signal SSS.

[0055] In combination with the third aspect, in certain implementations of the third aspect, the sequence length of the PSS is greater than the sequence length of the SSS.

[0056] In combination with the third aspect, in certain implementations of the third aspect, the first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization broadcast block SSB.

[0057] In combination with the third aspect, in certain implementations of the third aspect, receiving the second synchronization signal includes: receiving the second main synchronization signal in the SSB based on the received first main synchronization signal, the second main synchronization signal corresponds one-to-one to the first main synchronization signal, and the sequence of the second main synchronization signal is determined by the sequence of the first main synchronization signal.

[0058] In combination with the third aspect, in certain implementations of the third aspect, a sequence length of the first primary synchronization signal is greater than a sequence length of the second primary synchronization signal.

[0059] In combination with the third aspect, in certain implementations of the third aspect, receiving the second synchronization signal further includes: receiving a secondary synchronization signal SSS in the SSB based on the received second primary synchronization signal.

[0060] In combination with the third aspect, in certain implementations of the third aspect, the apparatus further includes a processing unit configured to receive a physical broadcast channel (PBCH) based on the second primary synchronization signal and the SSS.

[0061] In combination with the third aspect, in certain implementations of the third aspect, the first synchronization signal is repeatedly sent on multiple frequency bands.

[0062] In combination with the third aspect, in certain implementations of the third aspect, the transceiver unit is further configured to receive the SSS in the second symbol after receiving the PSS.

[0063] In combination with the third aspect, in certain implementations of the third aspect, the transceiver unit is further configured to receive a second primary synchronization signal in a first symbol after receiving the first synchronization signal.

[0064] In combination with the third aspect, in certain implementations of the third aspect, the transceiver unit is further configured to receive the SSS in a second symbol after receiving the second primary synchronization signal.

[0065] In combination with the third aspect, in certain implementations of the third aspect, the transceiver unit is further configured to repeatedly send the first synchronization signal in the time domain.

[0066] In a fourth aspect, a communication device is provided, including: a transceiver unit, the transceiver unit being used to send a first synchronization signal; the transceiver unit being also used to send a second synchronization signal, the width of the transmission beam of the first synchronization signal being greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal including the coverage ranges of the transmission beams of multiple second synchronization signals.

[0067] In combination with the fourth aspect, in certain implementations of the fourth aspect, within a first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0068] In combination with the fourth aspect, in certain implementations of the fourth aspect, the second synchronization signal has the same frequency domain center point as the first synchronization signal.

[0069] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first synchronization signal includes a synchronization signal generated based on a physical cell identifier PCI or part of the PCI, and the second synchronization signal includes a synchronization signal generated based on the PCI or part of the PCI.

[0070] In combination with the fourth aspect, in some implementations of the fourth aspect, the first synchronization signal includes a first primary synchronization signal PSS, and the second synchronization signal includes a secondary synchronization signal SSS.

[0071] In combination with the fourth aspect, in certain implementations of the fourth aspect, a sequence length of the primary synchronization signal is greater than a sequence length of the secondary synchronization signal.

[0072] In combination with the fourth aspect, in certain implementations of the fourth aspect, the first synchronization signal includes a first primary synchronization signal PSS, the second synchronization signal includes a synchronization broadcast block SSB, the SSB includes a second primary synchronization signal, the second primary synchronization signal corresponds one-to-one to the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0073] In combination with the fourth aspect, in certain implementations of the fourth aspect, a sequence length of the first primary synchronization signal is greater than a sequence length of the second primary synchronization signal.

[0074] In combination with the fourth aspect, in certain implementations of the fourth aspect, sending the first synchronization signal includes: repeatedly sending the first synchronization signal on multiple frequency bands.

[0075] In a fifth aspect, a communication device is provided, comprising: a processor coupled to a memory, the memory being used to store a computer program, the processor being used to run the computer program, so that the communication device executes the method as described in the first aspect and any possible implementation thereof.

[0076] In a sixth aspect, a communication device is provided, comprising: a processor coupled to a memory, the memory being used to store a computer program, the processor being used to run the computer program, so that the communication device executes the method as described in the second aspect and any possible implementation thereof.

[0077] In the seventh aspect, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a computer, the computer executes the communication method that can be implemented in the first aspect and the first aspect, or the second aspect and the second aspect.

[0078] In an eighth aspect, a computer program product comprising instructions is provided, which, when executed on a computer, enables the computer to execute any of the communication methods that can be implemented in the first aspect and the first aspect, or the second aspect and the second aspect.

[0079] In the ninth aspect, a chip is provided, which includes a processor and a data interface. The processor reads instructions stored in a memory through the data interface to execute any communication method that can be implemented in the first aspect and the first aspect, or the second aspect and the second aspect.

[0080] In combination with the ninth aspect, in one possible implementation, the processor is coupled to the memory through an interface.

[0081] In combination with the ninth aspect, in one possible implementation, the chip system also includes a memory, in which a computer program or computer instructions are stored. BRIEF DESCRIPTION OF THE DRAWINGS

[0082] FIG1 is a schematic diagram of a system architecture.

[0083] FIG2 is a schematic diagram of an SSB collection pattern.

[0084] FIG3 is a schematic diagram of another SSB collection pattern.

[0085] FIG4 is a schematic diagram of a broadcast signal design provided in an embodiment of the present application.

[0086] FIG5 is a schematic diagram of a broadcast signal structure provided in an embodiment of the present application.

[0087] FIG6 is a flowchart of initial access of a terminal device provided in an embodiment of the present application.

[0088] FIG7 is a schematic diagram of another broadcast signal design provided in an embodiment of the present application.

[0089] FIG8 is a schematic diagram of another broadcast signal design provided in an embodiment of the present application.

[0090] FIG9 is a schematic diagram of another broadcast signal structure provided in an embodiment of the present application.

[0091] FIG10 is another flowchart of initial access of a terminal device provided in an embodiment of the present application.

[0092] FIG11 is a schematic diagram of another broadcast signal design provided in an embodiment of the present application.

[0093] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application.

[0094] FIG13 is a schematic diagram of a communication architecture provided in an embodiment of the present application. DETAILED DESCRIPTION

[0095] The technical solution in this application will be described below with reference to the accompanying drawings.

[0096] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) or new radio (NR) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, etc. The technical solutions provided by the present application can also be applied to future communication systems, such as future communication networks. The technical solutions provided by the present application can also be applied to device to device (D2D) communication, vehicle to everything (V2X) communication, machine to machine (M2M) communication, machine type communication (MTC), and Internet of Things (IoT) communication systems. The technical solutions provided by the present application can also be applied to low-frequency scenarios, high-frequency scenarios, terahertz, optical communications, licensed frequency bands, and can also be used in unlicensed frequency bands, etc.

[0097] The terminal devices (e.g., user equipment (UE)) in the embodiments of the present application include various devices with wireless communication functions, which can be used to connect people, objects, machines, etc. The terminal devices can be widely used in various scenarios, such as: cellular communication, D2D, V2X, peer to peer (P2P), M2M, MTC, IoT, virtual reality (VR), augmented reality (AR), industrial control, autonomous driving, telemedicine, smart grid, smart furniture, smart office, smart wearable, smart transportation, smart city drones, robots, remote sensing, passive sensing, positioning, navigation and tracking, autonomous delivery, etc. The terminal device can be a terminal in any of the above scenarios, such as an MTC terminal, an IoT terminal, etc. The terminal device can be a user equipment (UE) of the third generation partnership project (3GPP) standard, a terminal, a fixed device, a mobile station device or a mobile device, a subscriber unit, a handheld device, a vehicle-mounted device, a wearable device, a cellular phone, a smart phone, a SIP phone, a wireless data card, a personal digital assistant (PDA), a computer, a tablet computer, a notebook computer, a wireless modem, a handheld device (handset), a laptop computer, a computer with wireless transceiver function, a smart book, a vehicle, a satellite, a global positioning system (GPS) device, a target tracking device, an aircraft (such as a drone, a helicopter, a multi-copter, a quadcopter, or an airplane), a ship, a remote control device, a smart home device, an industrial device, or a device built into the above-mentioned device (such as a communication module, a modem or a chip in the above-mentioned device), or other processing devices connected to the wireless modem. It should be understood that in some scenarios, the terminal device can also be used to act as a base station. For example, a terminal device may act as a scheduling entity that provides sidelink signals between terminal devices in scenarios such as V2X, D2D, or P2P.

[0098] The network device in the embodiments of the present application may be a device for communicating with a terminal device, and may also be referred to as an access network device or a radio access network device. For example, the network device may be a base station. The network device in the embodiments of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network. A base station may broadly encompass various names as follows, or may be replaced with the following names, such as: NodeB, evolved NodeB (eNB), next generation NodeB (gNB), relay station, access point, transmitting and receiving point (TRP), transmission point, master station, auxiliary station, multi-standard radio (motor slide retainer, MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, or radio unit (RU), etc. A base station may be a macro base station, a micro base station, a relay node, a donor node, or the like, or a combination thereof. A base station may also refer to a communication module, modem, or chip used to be installed in the aforementioned equipment or devices. A base station may also be a mobile switching center, a device that performs base station functions in D2D, V2X, and M2M communications, a network-side device in a future communication network, or a device that performs base station functions in a future communication system. A base station may support networks with the same or different access technologies. The embodiments of this application do not limit the specific technology and specific device form used by network equipment.

[0099] Base stations can be fixed or mobile. For example, a helicopter or drone can be configured to act as a mobile base station, and one or more cells can move based on the location of the mobile base station. In other examples, a helicopter or drone can be configured to act as a device that communicates with another base station.

[0100] In some deployments, the network device mentioned in the embodiments of the present application may be an access network device in an open access network (O-RAN or ORAN) or a cloud radio access network (CRAN). Alternatively, the network device may be a satellite in a satellite communication system.

[0101] In some deployments, the network device mentioned in the embodiments of the present application may also be a device including a CU, or a DU, or a device including a CU and a DU, or a control plane CU node (central unit control plane (central unit-control plane, CU-CP)) and a user plane CU node (central unit user plane (central unit-user plane, CU-UP)) and a DU node.

[0102] It should be noted that in different systems, CU (or CU-CP and CU-UP), DU or RU may have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called an open centralized unit (O-CU) or an open CU, DU may also be called an open distributed unit (O-DU), CU-CP may also be called an open centralized unit control plane (O-CU-CP), CU-UP may also be called an open centralized unit user plane (O-CU-UP), and RU may also be called an open radio unit (O-RU). This application does not limit this. Any of the CU, CU-CP, CU-UP, DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module.

[0103] Optionally, for network elements in the ORAN system, each network element may implement the protocol layer functions shown in Table 1 below.

[0104] Table 1

[0105] It should be noted that, in the ORAN system, the network device in this application may be one or more network elements in Table 1 above.

[0106] The embodiments of the present application do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. As long as it is possible to communicate according to the method provided by the embodiments of the present application by running a program that records the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0107] In addition, various aspects or features of the present application can be implemented as methods, devices or products using standard programming and / or engineering techniques. The term "product" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information.

[0108] The embodiments of the present application do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. As long as it is possible to communicate according to the method provided by the embodiments of the present application by running a program that records the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application can be a terminal device or a network device, or a functional module in the terminal device or the network device that can call and execute the program.

[0109] Before introducing the solutions of the embodiments of the present application, the following points are explained.

[0110] (1) In the embodiments of the present application, "indication" may include direct indication, indirect indication, explicit indication, and implicit indication. When describing that a certain indication information is used to indicate A, it can be understood that the indication information carries A, directly indicates A, or indirectly indicates A.

[0111] In the embodiment of the present application, the information indicated by the indication information is referred to as information to be indicated. In the specific implementation process, there are many ways to indicate the information to be indicated, such as but not limited to, the information to be indicated can be directly indicated, such as the information to be indicated itself or the index of the information to be indicated. The information to be indicated can also be indirectly indicated by indicating other information, wherein there is an association between the other information and the information to be indicated. It is also possible to indicate only a part of the information to be indicated, while the other parts of the information to be indicated are known or agreed in advance. For example, the indication of specific information can also be achieved with the help of the arrangement order of each information agreed in advance (for example, stipulated by the protocol), thereby reducing the indication overhead to a certain extent. In addition, the information to be indicated can be sent together as a whole, or it can be divided into multiple sub-information and sent separately, and the sending period and / or sending time of these sub-information can be the same or different.

[0112] (2) In the embodiments of the present application, "sending" and "receiving" indicate the direction of signal transmission. For example, "sending information to XX" can be understood as the destination of the information being XX, which can include direct sending through the air interface, and also include indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as the source of the information being YY, which can include direct receiving from YY through the air interface, and also include indirect receiving from YY through the air interface from other units or modules. "Sending" can also be understood as the "output" of the chip interface, and "receiving" can also be understood as the "input" of the chip interface. In other words, sending and receiving can be performed between devices, for example, between a network device and a terminal device, or can be performed within a device, for example, sending or receiving between components, modules, chips, software modules or hardware modules within the device through a bus, a line or an interface.

[0113] The following introduces the technical terms involved in the embodiments of this application.

[0114] Non-terrestrial networks (NTNs), such as satellite communications, offer advantages such as wide coverage, long communication distances, high reliability, flexibility, and high throughput. Unaffected by geographical conditions, climate conditions, and natural disasters, they are widely used in aviation, maritime, and military communications. Incorporating satellites into the future fifth-generation mobile communications new air interface technology will enable communication services in areas difficult to reach by terrestrial networks, such as oceans and forests. This will enhance the reliability of 5G communications, providing more stable and high-quality communication services for users on trains, airplanes, and other modes of transportation. It will also provide more data transmission resources and support a greater number of connections.

[0115] Beam: It can be understood as a spatial filter or spatial parameters. The beam used to send signals can be called a transmission beam (Tx beam), which can be a spatial domain transmit filter or spatial transmit parameters (spatial transmit parameters, spatial Tx parameters), or a spatial transmit angle (such as azimuth, zenith) or a spatial transmit angle range (such as azimuth center angle and offset, azimuth uncertainty, azimuth protection range, zenith center angle and offset, zenith angle uncertainty, zenith angle protection range), etc. The beam used to receive signals can be called a reception beam (Rx beam), which can be a spatial domain receive filter or spatial receive parameters (spatial Rx parameters). parameters), or a spatial receiving angle (such as azimuth, zenith) or a spatial receiving angle range (such as azimuth center angle and offset, azimuth uncertainty, azimuth protection range, zenith center angle and offset, zenith angle uncertainty, zenith angle protection range), etc.

[0116] The technology for forming the beam may be a beamforming technology or other technology. For example, the beamforming technology may specifically be a digital beamforming technology, an analog beamforming technology, or a hybrid digital / analog beamforming technology. A transmit beam may refer to the distribution of signal strength in different directions in space after the signal is transmitted by the antenna, and a receive beam may refer to the distribution of signal strength in different directions in space of the wireless signal received from the antenna. The beamforming technology of the embodiment of the present application may be implemented based on a power amplifier made of new materials, or based on a new antenna architecture, such as a new hybrid phased array and lens antenna technology.

[0117] In the 5G-NR protocol, a beam can be a spatial filter. However, it should be understood that this application does not exclude the possibility of defining other terms in future protocols to express the same or similar meanings.

[0118] Antenna panel: Also known as a panel. Each antenna panel can be configured with one or more receive beams and one or more transmit beams. Therefore, an antenna panel can also be considered a beam group. Communication devices, such as terminal devices or network equipment, can receive signals using the receive beams on the antenna panel and transmit signals using the transmit beams on the antenna panel.

[0119] Figure 1 is a schematic diagram of a system architecture. It should be understood that the scenarios in which the method of the embodiments of the present application can be used may include more or fewer devices or equipment, or may include devices or equipment with similar functions. The system architecture shown in Figure 1 includes a network device 111 (which may include a single or multiple network devices), and terminal devices 121 and 122 (which may include a single or multiple terminal devices). Among them, the network device and the terminal device can have high-frequency and low-frequency communication capabilities. It should be noted that the communication method provided in the embodiments of the present application can take a single network device and multiple terminal devices as examples, and the network device can transmit data or control signaling to the terminal device.

[0120] In NTN communication scenarios, due to the long communication distances and poor link budgets of network equipment, terminal devices typically use phased array narrow beam alignment to improve reception gain, such as narrow beam widths of 1° to 3°, to meet high-throughput needs like broadband video transmission. When a vehicle-mounted phased array terminal device is moving at high speeds, road bumps or vehicle steering can cause rapid changes in the three-axis attitude. This jitter in the phased array causes jitter in the beam direction, which is a common occurrence. To maintain precise narrow beam pointing, improved beam alignment mechanisms are needed in NTN scenarios. This not only ensures rapid satellite search during initial access, but also maintains stable beam tracking during data transmission. Satellites provide beam-based services, with a single beam transmitting a single stream. Therefore, satellite terminals often use a single RF channel to save costs, which further complicates beam alignment.

[0121] During the initial access phase of a terrestrial cellular system, network equipment sends a synchronization signal / PBCH block (SSB) set at a certain period. The SSB set may include multiple SSBs, each of which corresponds to a beam direction.

[0122] Specifically, SSB is one of the commonly used pilot channels and can be used in many aspects of terminal equipment accessing network equipment, such as cell search, beam measurement, beam selection, beam recovery and other specific aspects.

[0123] Exemplarily, the transmission period of the SSB set can be 5ms, 10ms, 20ms, 40ms, 80ms, 160ms, etc.

[0124] FIG2 is a schematic diagram of an SSB collection pattern.

[0125] Please refer to Figure 2. SSB can occupy 4 symbols, which include the primary synchronization signal (PSS), the secondary synchronization signal (SSS) and the physical broadcast channel (PBCH). Among them, PSS is located in the first symbol of SSB to help the terminal device obtain the wireless frame boundary. The m-sequence of PSS can be composed of 127 values, mapped to 127 subcarriers. The terminal device can determine whether the beam direction of the terminal device and the network device is aligned by whether the PSS is detected. SSS can be a combination of m-sequences. For example, SSS can include 336 indexes. The terminal device can parse the information in SSB based on the information in SSS. PBCH can include system information, and the terminal device can decode PBCH based on PSS and SSS.

[0126] Furthermore, the terminal device adjusts the beam direction and attempts to search for the PSS in the SSB in different directions. When the beam of the SSB sent by the network device covers the terminal device and the SSB signal power received by the beam of the terminal device is strong enough, the terminal device can detect the PSS and complete access.

[0127] Furthermore, an SSB set may exist within a 5ms half-frame, and the pattern of the SSB set is related to the frequency band in which the system operates.

[0128] Specifically, the SSB set pattern shown in Figure 2 is applicable to 15kHz subcarrier spacing. When the carrier frequency is less than 3GHz, an SSB set can contain 4 SSBs, occupying the first 2 time slots of the half frame, with each time slot containing 2 SSBs. When the carrier frequency is greater than 3GHz, an SSB set can contain 8 SSBs, occupying the first 4 time slots of the half frame, with each time slot containing 2 SSBs.

[0129] Continuing with Figure 2, the SSB pattern is the same in each time slot. Since the first two symbols in a time slot need to be reserved for the downlink control channel and the last two symbols for the uplink control channel, symbols 0, 1, 12, and 13 in a time slot with 15 kHz subcarrier spacing shown in Figure 2 are not mapped to the SSB. Furthermore, to coexist with 30 kHz subcarrier spacing, symbols 6 and 7 in a time slot with 15 kHz subcarrier spacing are also not mapped to the SSB and are reserved for the uplink control channel and downlink control channel, respectively, with 30 kHz subcarrier spacing.

[0130] FIG3 is a schematic diagram of another SSB collection pattern.

[0131] Specifically, the SSB set pattern shown in Figure 3 is applicable to 30kHz subcarrier spacing. When the carrier frequency is less than 3GHz, an SSB set can contain 4 SSBs, occupying the first time slot pair of half a frame, and a time slot pair contains 2 time slots. When the carrier frequency is greater than 3GHz, an SSB set can contain 8 SSBs, occupying the first 2 time slot pairs of half a frame.

[0132] Please continue to refer to Figure 3. The SSB pattern in each time slot pair is the same. Since the first two symbols in a time slot need to be reserved for the downlink control channel and the last two symbols are used for the uplink control channel, the symbols 0, 1, 12, and 13 in the first and second time slots of a time slot pair with a 30kHz subcarrier spacing shown in Figure 3 are not mapped to SSB.

[0133] In non-terrestrial network scenarios, network equipment and terminal devices require beam alignment for subsequent data transmission. During the beam alignment process, upon initial access, the terminal device can adjust the beam pointing periodically, continuously changing the direction of the terminal device's receiving beam to attempt to search for the SSB. When the network device needs to scan a large number of transmit beam directions, and the phased array terminal has a large number of selectable receive beam directions, such as up to hundreds of beam directions, the terminal device must complete beam scans in a large number of directions before it can align with the satellite. Especially in scenarios where both low-orbit satellites and vehicle-mounted terminals are moving at high speeds, the initial access process will be more lengthy and even difficult to access.

[0134] In view of the above problems, an embodiment of the present application provides a communication method and apparatus that can reduce the time required for initial access of a terminal device.

[0135] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings.

[0136] FIG4 is a schematic diagram of a broadcast signal design provided in an embodiment of the present application.

[0137] Specifically, the broadcast signal design schematic shown in FIG4 takes a scenario with a subcarrier spacing of 15 kHz as an example. The second synchronization signal can be located in a second signal set, which can include four second synchronization signals, occupying the first two time slots of one half-frame. The first synchronization signal can be located in a first signal set, which can include multiple time slots including the first synchronization signal shown in FIG4.

[0138] In one possible implementation, a network device transmits a first synchronization signal; the network device transmits a second synchronization signal, wherein the width of a transmission beam of the first synchronization signal is greater than the width of a transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals. Accordingly, a terminal device receives the first synchronization signal; the terminal device receives the second synchronization signal, wherein the width of a transmission beam of the first synchronization signal is greater than the width of a transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals.

[0139] It should be understood that since the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals, in the embodiment of the present application, the first synchronization signal can also be called a wide beam synchronization signal, a wide beam signal, or a wide beam, and the second synchronization signal can also be called a narrow beam synchronization signal, a narrow beam signal, or a narrow beam. The embodiment of the present application does not limit their names.

[0140] Specifically, please refer to Figure 4 for the pattern design of the first synchronization signal and the second synchronization signal. In Figure 4, the first synchronization signal is located at symbols 2 and 8 in a time slot, and the network device uses a wide beam to send at symbols 2 and 8; in Figure 4, the second synchronization signal is located at symbols 3 to 5 and symbols 9 to 11 in the time slot, and the network device uses a narrow beam to send at symbols 3 to 5 and symbols 9 to 11, that is, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals.

[0141] It should be understood that the specific positions of the first synchronization signal and the second synchronization signal in the embodiment of the present application are only used as an example, and the embodiment of the present application is not limited to this.

[0142] In an embodiment of the present application, a terminal device receives a first synchronization signal and a second synchronization signal sent by a network device, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device, and then when the terminal device adjusts the direction of the receiving beam to try to receive the synchronization signal of the network device, it can search for the first synchronization signal more quickly than directly searching for the second synchronization signal, so that the receiving beam of the terminal device can be aimed at the network device more quickly, reducing the time required for the terminal device to access the network device more quickly.

[0143] In an embodiment of the present application, the first synchronization signal is transmitted using a wider beam than the second synchronization signal, which can increase the coverage range of the transmission beam of the first synchronization signal mapped on the ground, thereby reducing the time when the transmission beam cannot cover the location of the terminal device due to beam hopping, and preventing the terminal device from being unable to accurately point to the network device due to too long a time without beam service and thus failing to receive the downlink signal sent by the network device.

[0144] In a possible implementation, the first synchronization signal includes a synchronization signal generated according to a physical cell identity (PCI) or a portion of a PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a portion of a PCI.

[0145] For example, the calculation formula of PCI is as follows:

[0146] in, Carried in PSS, PSS is an m-sequence with a length of 127. The sequence generation formula is: PSS (n) = 1-2x(m) 0≤n<127 x(i+7)=[x(i+4)+x(i)]mod2 [x(6)x(5)x(4)x(3)x(2)x(1)x(0)]=[1 1 1 0 1 1 0]

[0147] Carried in SSS, SSS is a gold sequence with a length of 127. The sequence generation formula is: SSS (n)={1-2x0[(n+m0)mod127]}{1-2x1[(n+m1)mod127]} 0≤n<127 x0(i+7)=[x0(i+4)+x0(i)]mod2 [x1(6)x1(5)x1(4)x1(3)x1(2)x1(1)x1(0)]=[0 0 0 0 0 0 1]

[0148] It should be understood that the first synchronization signal may also be other forms of signals having the same function as the PSS, and the second synchronization signal may also be other forms of signals having the same function as the SSS and PBCH, and the embodiments of the present application are not limited to this.

[0149] In a possible implementation, the first synchronization signal includes a PSS, and the second synchronization signal includes an SSS.

[0150] It should be understood that when the first synchronization signal is PSS, the first synchronization signal can also be called a wide-beam PSS, and when the second synchronization signal includes SSS, SSS can be called a narrow-beam SSS. This application does not limit the specific names.

[0151] Specifically, please continue to refer to Figure 4. The second synchronization signal can be symbols 1 to 3 in the SSB, that is, other symbols in the SSB except the 0th symbol.

[0152] It should be understood that the structure of the SSB shown in FIG4 is merely an example, and the embodiments of the present application do not impose specific restrictions on the specific structures and time domain positions of the first synchronization signal and the second synchronization signal.

[0153] It should also be understood that the signal content of the SSB shown in Figure 4 is only an example. The first synchronization signal and the second synchronization signal are two non-overlapping synchronization signals in the time domain used for beam alignment. In the embodiment of the present application, there is no specific restriction on the content of the first synchronization signal and the second synchronization signal.

[0154] In a possible implementation, within the first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0155] Specifically, the first synchronization signal can be located in the first signal set, and the first signal set can be sent continuously and normally; the second synchronization signal can be located in the second signal set, and the second signal set can be sent periodically. Since the first synchronization signal is sent using a wide beam and the second synchronization signal is sent using a narrow beam, over a period of time, the number of transmission beams of the first synchronization signal covering the terminal device is greater than the number of transmission beams of the second synchronization signal covering the terminal device.

[0156] Optionally, the sending period of the first signal set can be the same as the time domain length of the first signal set. For example, when the first signal set contains 5 time slots, the sending period of the first signal set is 5 time slots, that is, the sending period of the first signal set is 5ms, or it is called normalized sending of the first signal set.

[0157] Optionally, the transmission period of the first signal set may be greater than the time domain length of the first signal set and less than or equal to the transmission period of the second signal set. For example, if the first signal set includes 5 time slots and the transmission period of the second signal set is 20 ms, the transmission period of the first signal set may also be 10 time slots, that is, the transmission period of the first signal set is 10 ms.

[0158] It should be understood that in an embodiment of the present application, within the first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals, but the sending period of the first signal set is not directly related to the sending period of the second signal set.

[0159] It should be understood that the first signal set includes 5 time slots only as an example. The first signal set may also include 1 time slot, 2 time slots, 10 time slots, etc., and this application does not limit this.

[0160] Further, please continue to refer to Figure 4. In a scenario where the subcarrier spacing is 15kHz, in a time slot in the first signal set, the time domain position of the first synchronization signal is symbol 2 and symbol 8. When the second synchronization signal in the second signal set sent by the network device is adjacent to the first synchronization signal in the first signal set sent by the network device in the time domain, that is, the second synchronization signal is sent after the first synchronization signal, the network device sends the first synchronization signal in the first signal set at symbols 2 and 8, and sends the second to fourth symbols in the SSB shown in Figure 4 at symbols 3 to 5 and symbols 9 to 11 in the narrow beam direction corresponding to the wide beam direction of the first synchronization signal, including PBCH and SSS.

[0161] Furthermore, in the scenario where the subcarrier spacing is 15kHz as shown in Figure 4, within a time slot in the first signal set, the time domain position of the first synchronization signal is symbol 2 and symbol 8. Since the number of second synchronization signals can be less than the number of first synchronization signals within the first time length, when the first signal set and the second signal set sent by the network device do not correspond to the same time domain, the network device only sends the first synchronization signal at symbol 2 and symbol 8, and there is no need to send the second synchronization signal at symbols 3 to 5 and 9 to 11.

[0162] In a possible implementation, the second synchronization signal follows the first synchronization signal, and the second synchronization signal is adjacent to the first synchronization signal in time domain.

[0163] Specifically, a first signal set in FIG4 may include multiple time slots, and the position of the first synchronization signal in a time slot in the first signal set is adjacent to the second synchronization signal in a time slot in the associated sent second signal set in the time domain.

[0164] For example, please continue to refer to Figure 4. In the first signal set, the position of the first synchronization signal in the first signal set is adjacent to the time domain position of the second synchronization signal in the second signal set. In Figure 4, in the first time slot, the position of the first synchronization signal in the first signal set is symbol 2 and symbol 8, and the position of the second synchronization signal in the second synchronization signal set is symbol 3 to symbol 5 and symbol 9 to symbol 11, that is, the positions are adjacent in the time domain.

[0165] In an embodiment of the present application, the second synchronization signal is adjacent to the corresponding first synchronization signal in time domain, so that the terminal device can immediately detect the second synchronization signal after detecting the first synchronization signal, that is, the terminal device can detect the second synchronization signal in an adjacent and determined time domain, reducing the system overhead of the terminal device.

[0166] In a possible implementation, the second synchronization signal and the first synchronization signal have the same frequency domain center point.

[0167] Specifically, please refer to Figure 4. The first synchronization signal in Figure 4 can be PSS, and the frequency domain center point of PSS is aligned with the frequency domain center point of the synchronization signal in each symbol in the second synchronization signal. For example, PSS is aligned with the frequency domain center point of the frequency band occupied by PBCH in symbol 1 and symbol 3, or PSS is aligned with the frequency domain center point of the frequency band occupied by SSS in symbol 2.

[0168] In an embodiment of the present application, the terminal device can detect the second synchronization signal in the same frequency band as the center point of the frequency domain after detecting the first synchronization signal, thereby reducing the detection overhead of the terminal device.

[0169] FIG5 is a schematic diagram of a broadcast signal structure provided in an embodiment of the present application.

[0170] In a possible implementation, the sequence length of the PSS is greater than the sequence length of the SSS.

[0171] Specifically, since the first synchronization signal is sent using a wide beam, which will cause a loss of beam gain, the network device may use a longer sequence to enhance beam alignment performance.

[0172] Please refer to Figures 4 and 5. The broadcast signal structure shown in Figure 5 can be used in the frame structure of the broadcast signal design shown in Figure 4. The sequence of the first synchronization signal shown in Figure 4 can be an m sequence, where the length of the m sequence is 2. N -1, the broadcast signal structure in FIG4 can be replaced by the broadcast signal structure shown in FIG5, that is, the sequence of the first synchronization signal in FIG4 can adopt a longer sequence length, for example, the sequence length of the first synchronization signal is greater than 127.

[0173] For example, the PSS sequence in FIG4 and FIG5 may adopt an m-sequence with a length of 255.

[0174] In the embodiment of the present application, since the beam width of PSS is greater than the beam width of SSS, and a wide beam will cause a loss of beam gain, the network device uses a sequence with a length greater than SSS when sending PSS, which can enable the terminal device to obtain a higher detection peak when detecting PSS, and increase the accuracy of the terminal device confirming the receipt of PSS, thereby enhancing the performance of beam alignment between the terminal device and the network device, and overcoming the loss of beam gain caused by a wide beam.

[0175] In a possible implementation, the network device repeatedly sends the first synchronization signal on multiple frequency bands.

[0176] Specifically, since the broadcast signal used for beam alignment, i.e., the wide beam PSS, is sent using a wide beam, and the wide beam will lose beam gain, the network device can repeatedly send the first synchronization signal on multiple frequency bands to enhance the beam alignment performance.

[0177] For example, please continue to refer to Figure 4. The network device can send the first synchronization signal using a wide beam in multiple frequency bands at the positions of symbol 2 and symbol 8 in the time slot. Accordingly, the terminal device can search for the first synchronization signal in multiple frequency bands, so that the terminal device can receive more first synchronization signals within a certain period of time.

[0178] Furthermore, the first synchronization signals repeatedly sent by the network device in multiple frequency domains may be of the same sequence, or may be different sequences carrying the same information.

[0179] For example, please continue to refer to Figure 4. The network device can use a wide beam to send the first synchronization signal in multiple frequency bands at the positions of symbol 2 and symbol 8 in the time slot. The network device can also send PSS1 in one of the frequency bands and send PSS2 in another frequency band. PSS1 and PSS2 both use the same However, the specific sequence format may be different.

[0180] In an embodiment of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause a loss of beam gain, the network device repeatedly sends the first synchronization signal on multiple frequency bands, which allows the terminal device to receive a larger number of first synchronization signals within a period of time, increasing the chance of the terminal device receiving the first synchronization signal with a power that meets the requirements, thereby reducing the time required for the terminal device during the initial access process.

[0181] In a possible implementation manner, the network device repeatedly sends the first synchronization signal in the time domain.

[0182] Specifically, since the broadcast signal used for beam alignment, i.e., the wide beam PSS, is sent using a wide beam, and the wide beam will lose beam gain, the network device can repeatedly send the first synchronization signal in the time domain to enhance the beam alignment performance.

[0183] For example, please continue to refer to Figure 4. The network device can repeatedly use the wide beam to send the first synchronization signal at the positions of symbol 2 and symbol 3 in the time slot. Adaptively, the network device can send the second synchronization signal at symbols 4 to 6, so that there can be more wide beam first synchronization signals covering the terminal device within a certain period of time.

[0184] Furthermore, the first synchronization signal repeatedly sent by the network device in the time domain may be the same sequence, or may be different sequences carrying the same information.

[0185] For example, please continue to refer to Figure 4. The network device can repeatedly use a wide beam to send the first synchronization signal at the position of symbol 2 and symbol 3 in the time slot, wherein the network device sends PSS1 at symbol 2 and sends PSS2 at symbol 3. PSS1 and PSS2 both use the same However, the specific sequence format may be different.

[0186] In an embodiment of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause a loss of beam gain, the network device repeatedly sends the first synchronization signal in the time domain so that more wide-beam first synchronization signals can cover the terminal device within a certain period of time, thereby increasing the chance of the terminal device receiving the first synchronization signal with power that meets the requirements, thereby reducing the time required for the terminal device during the initial access process.

[0187] FIG6 is a flowchart of a terminal device initial access process 600 provided in an embodiment of the present application.

[0188] It should be understood that in the initial access process of the terminal device shown in Figure 6, the pattern of the synchronization signal block takes Figure 4 as an example, that is, the first synchronization signal takes the wide beam PSS as an example, and the second synchronization signal takes symbols 1 to 3 in the narrow beam SSB as an example. The PSS and SSS in Figure 6 can also be other synchronization signals generated according to PCI or part of the content of PCI, and this application does not impose specific restrictions on this.

[0189] S610: The terminal device selects an optional beam direction to search for a wide-beam PSS. After the terminal device detects the wide-beam PSS, the terminal device measures the PSS power and executes S620.

[0190] Exemplarily, the terminal device adjusts the direction of a receiving beam every 0.5 ms and attempts to detect the wide-beam PSS.

[0191] S620: The terminal device determines whether the detected wide beam PSS meets the pointing requirement.

[0192] Specifically, when the wide beam PSS power detected by the terminal device is greater than or equal to a certain threshold, the terminal device executes S630; when the wide beam PSS power detected by the terminal device is less than the threshold, the terminal device executes S660.

[0193] Optionally, when the power of the wide-beam PSS detected by the terminal device is greater than or equal to -100dBm, the terminal device searches for the narrow-beam SSS after the wide-beam PSS. When the power of the PSS detected by the terminal device is less than -100dBm, the terminal device adjusts the beam pointing and continues to search for the wide-beam PSS.

[0194] Optionally, the terminal device selects a beam direction with the largest receiving power among all receiving beams to search for the SSS.

[0195] S660: The wide beam PSS detected by the terminal device does not meet the pointing requirement, the terminal device adjusts the beam pointing and returns to execute S610.

[0196] S630: In a possible implementation, the terminal device receives a second synchronization signal, including: receiving the second synchronization signal according to the first synchronization signal received by the terminal.

[0197] In a possible implementation, receiving the second synchronization signal according to the first synchronization signal received by the terminal device includes: receiving the second synchronization signal according to a receiving beam direction of the first synchronization signal or a receiving beam codebook of the first synchronization signal.

[0198] In a possible implementation, the terminal device may also use the time-frequency resource of the first synchronization signal or the first synchronization signal in the first synchronization signal to obtain the first synchronization signal. A second synchronization signal is received.

[0199] Exemplarily, as shown in FIG6 , after the terminal device detects a wide-beam PSS that meets the pointing requirement, the terminal device searches for a narrow-beam SSS using a beam with the same receiving beam direction as the wide-beam PSS.

[0200] In an embodiment of the present application, the terminal device receives a second synchronization signal based on the received first synchronization signal, and the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, compared with directly receiving the second synchronization signal, the terminal device can align with the network device more quickly, and then the terminal detects the second synchronization signal based on the alignment with the network device, reducing the time required for the terminal device in the initial access process.

[0201] In a possible implementation, the terminal device detects the SSS at the second symbol after detecting the wide-beam PSS.

[0202] Specifically, referring to Figure 4 , the terminal device detects the SSS in the second symbol after detecting a wide-beam PSS that meets the pointing requirements, i.e., symbol 4 and symbol 10. Since the number of second synchronization signals that the terminal device can receive within a period of time is less than the number of first synchronization signals that the terminal device can receive within the same period of time, the SSS may exist in the second symbol after any wide-beam PSS. For the terminal device's judgment process, refer to S640.

[0203] S640: The terminal device determines whether the second symbol after detecting the wide beam PSS that meets the pointing requirements contains SSS. If the terminal device detects SSS, the terminal device executes S650, i.e., performs initial access; if the terminal device does not detect SSS, the terminal device executes S670.

[0204] Specifically, SSS may exist after any wide-beam PSS, and the detection of SSS requires blind detection of the index. For example, the index of SSS in the second signal may be 336. The terminal device needs to determine through blind detection whether the signal detected in the second symbol after the detected wide-beam PSS corresponds to one of the above 336 indexes.

[0205] S670: The terminal device keeps the receiving beam direction unchanged and attempts to detect the next wide beam PSS. After detecting the next wide beam PSS that meets the pointing requirements, the terminal device returns to execute S630, that is, the terminal device detects the SSS in the second symbol after detecting the next wide beam PSS that meets the pointing requirements.

[0206] S650: The terminal device parses the second synchronization signal according to the detected PSS and SSS and performs initial access.

[0207] Specifically, the terminal device detects the PSS and SSS and Calculate N ID , parse the PBCH in the second synchronization signal, obtain the PBCH payload and MIB, further parse the SIB message, and the terminal device completes the initial access according to the MIB message and SIB message.

[0208] In one possible implementation, during the initial access process shown in Figure 6, the terminal device performs beam scanning, searches for the wide-beam PSS in different beam directions and detects the power of the wide-beam PSS. When the detected wide-beam PSS power meets the access requirements, that is, the beam direction meets the pointing requirements, the terminal device searches for the narrow-beam SSS sent by the network device after the wide-beam PSS. If the terminal device cannot search for a wide-beam PSS with a power that meets the access requirements in one beam direction, it means that the beam pointing currently selected by the terminal device does not meet the pointing requirements. The terminal device continues to adjust the beam pointing, and the terminal device continues to try to search for the wide-beam PSS on the adjusted beam pointing.

[0209] FIG7 is a schematic diagram of another broadcast signal design provided in an embodiment of the present application.

[0210] Specifically, the broadcast signal design schematic diagram shown in FIG7 takes a scenario with a subcarrier spacing of 30 kHz as an example. The second synchronization signal can be located in a second signal set, which can include four second synchronization signals, occupying the first time slot pair of one half frame. The first synchronization signal can be located in a first signal set, which can include multiple time slot pairs including the first synchronization signal shown in FIG7.

[0211] Specifically, in a scenario where the subcarrier spacing is 30kHz, within a time slot pair in the first signal set, the time domain position of the first synchronization signal is symbol 4, symbol 8 of the first time slot in the time slot pair and symbol 2, symbol 6 of the second time slot in the time slot pair. When the second synchronization signal in the second signal set sent by the network device is adjacent to the first synchronization signal in the first signal set sent by the network device in the time domain, that is, the second synchronization signal is sent after the first synchronization signal, the network device sends the first synchronization signal in the first signal set at symbols 4 and symbol 8 of the first time slot and symbols 2 and symbol 6 of the second time slot, and sends the second synchronization signal in the second signal set at symbols 5 to 7, symbol 9 to symbol 11 of the first time slot and symbols 3 to symbol 5, symbol 7 to symbol 9 of the second time slot, which includes PBCH and SSS.

[0212] Furthermore, in the scenario where the subcarrier spacing is 30kHz as shown in Figure 7, in a time slot in the first signal set, the time domain position of the first synchronization signal is symbol 4, symbol 8 of the first time slot in the time slot pair and symbol 2, symbol 6 of the second time slot in the time slot pair. In the embodiment of the present application, since the number of first synchronization signals covering terminal devices within a period of time is greater than the number of second synchronization signals covering terminal devices, when the time slot pair containing the first synchronization signal and the time slot pair containing the second synchronization signal sent by the network device do not correspond to the same time domain, the network device only sends the first synchronization signal in symbols 4, symbol 8 of the first time slot and symbols 2, symbol 6 of the second time slot in the time slot pair, and there is no need to send the second synchronization signal in symbols 5 to 7, symbol 9 to symbol 11 of the first time slot and symbols 3 to 5, symbol 7 to symbol 9 of the second time slot.

[0213] It should be understood that the broadcast signal design diagram shown in Figure 7 takes the scenario with a subcarrier spacing of 30kHz as an example. The difference between it and the scenario with a subcarrier spacing of 15kHz is mainly reflected in the different specific pattern structures. The characteristics of the signal sent by the network device when the subcarrier spacing is 30kHz can be the same as when the subcarrier spacing is 15kHz. For example, the width of the transmission beam of the first synchronization signal sent by the network device is greater than the width of the transmission beam of the second synchronization signal, etc. The embodiments of the present application will not be repeated here.

[0214] It should also be understood that the characteristics of the terminal device detection signal when the subcarrier spacing is 30kHz can be the same as when the subcarrier spacing is 15kHz. For example, the terminal device can receive the second synchronization signal based on the first synchronization signal, etc. The initial access process of the terminal device when the subcarrier spacing is 15kHz can refer to the process 600 above, and the embodiments of the present application will not be repeated here.

[0215] FIG8 is a schematic diagram of another broadcast signal design provided in an embodiment of the present application.

[0216] Specifically, the broadcast signal design schematic diagram shown in FIG8 takes a scenario with a subcarrier spacing of 15 kHz as an example. The second synchronization signal can be located in a second signal set, which can include four second synchronization signals, occupying the first two time slots of one half frame. The first synchronization signal can be located in a first signal set, which can include multiple time slots including the first synchronization signal shown in FIG4.

[0217] In one possible implementation, a network device transmits a first synchronization signal; the network device transmits a second synchronization signal, wherein the width of a transmission beam of the first synchronization signal is greater than the width of a transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals. Accordingly, a terminal device receives the first synchronization signal; the terminal device receives the second synchronization signal, wherein the width of a transmission beam of the first synchronization signal is greater than the width of a transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals.

[0218] It should be understood that since the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals, in the embodiment of the present application, the first synchronization signal can also be called a wide beam synchronization signal, a wide beam signal, or a wide beam, and the second synchronization signal can also be called a narrow beam synchronization signal, a narrow beam signal, or a narrow beam. The embodiment of the present application does not limit their names.

[0219] Specifically, please refer to Figure 8 for the pattern design of the first synchronization signal and the second synchronization signal. In Figure 8, the first synchronization signal is located at symbols 2 and 8 in a time slot, and the network device uses a wide beam to send at symbols 2 and 8; in Figure 8, the second synchronization signal is located at symbols 3 to 6 and symbols 9 to 12 in the time slot, and the network device uses a narrow beam to send at symbols 3 to 6 and symbols 9 to 12, that is, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals.

[0220] It should be understood that the specific positions of the first synchronization signal and the second synchronization signal in the embodiment of the present application are only used as an example, and the embodiment of the present application is not limited to this.

[0221] In an embodiment of the present application, a terminal device receives a first synchronization signal and a second synchronization signal sent by a network device, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of the transmission beams of multiple second synchronization signals, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device, and then when the terminal device adjusts the direction of the receiving beam to try to receive the synchronization signal of the network device, it can search for the first synchronization signal more quickly than directly searching for the second synchronization signal, so that the receiving beam of the terminal device can be aimed at the network device more quickly, reducing the time required for the terminal device to access the network device more quickly.

[0222] In an embodiment of the present application, the first synchronization signal is transmitted using a wider beam than the second synchronization signal, which can increase the coverage range of the beam mapping of the first synchronization signal on the ground, thereby reducing the time when the beam sent by the network device cannot cover the location of the terminal device, and preventing the terminal device from being unable to accurately point to the network device due to too long a time without beam service and thus failing to receive the downlink signal sent by the network device.

[0223] In a possible implementation, the first synchronization signal includes a synchronization signal generated according to a physical cell identifier PCI or a portion of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a portion of the PCI.

[0224] For example, the calculation formula of PCI is as follows:

[0225] in, Carried in PSS, PSS is an m-sequence with a length of 127. The sequence generation formula is: PSS (n) = 1-2x(m) 0≤n<127 x(i+7)=[x(i+4)+x(i)]mod2 [x(6)x(5)x(4)x(3)x(2)x(1)x(0)]=[1 1 1 0 1 1 0]

[0226] Carried in SSS, SSS is a gold sequence with a length of 127. The sequence generation formula is: SSS (n)={1-2x0[(n+m0)mod127]}{1-2x1[(n+m1)mod127]} 0≤n<127 x0(i+7)=[x0(i+4)+x0(i)]mod2 [x1(6)x1(5)x1(4)x1(3)x1(2)x1(1)x1(0)]=[0 0 0 0 0 0 1]

[0227] It should be understood that the first synchronization signal may also be other forms of signals having the same function as PSS, and the second synchronization signal may also be other forms of signals having the same function as SSB, and the embodiments of the present application do not limit this.

[0228] In a possible implementation, the first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization broadcast block SSB.

[0229] In one possible implementation, receiving the second synchronization signal includes receiving the second primary synchronization signal in the SSB based on the received first primary synchronization signal, the second primary synchronization signal corresponds one-to-one to the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0230] Specifically, the first primary synchronization signal and the second primary synchronization signal may be the same or different. The first primary synchronization signal and the second primary synchronization signal may be sequences in different forms generated using the same information. The second primary synchronization signal may be determined by the first primary synchronization signal.

[0231] It should be understood that when the first synchronization signal is PSS, the first synchronization signal can also be called wide-beam PSS, and when the second synchronization signal is SSB, SSB can be called narrow-beam SSB. This application does not limit the specific names.

[0232] It should be understood that the structure of the SSB shown in FIG8 is merely an example, and the embodiments of the present application do not impose specific restrictions on the specific structures and time domain positions of the first synchronization signal and the second synchronization signal.

[0233] It should also be understood that the signal content of the SSB shown in Figure 8 is only an example. The first synchronization signal and the second synchronization signal are two non-overlapping synchronization signals in the time domain used for beam alignment. In the embodiments of the present application, there is no specific restriction on the content of the first synchronization signal and the second synchronization signal.

[0234] In a possible implementation, within the first time length, the number of first synchronization signals is greater than or equal to the number of second synchronization signals.

[0235] Specifically, the first synchronization signal can be located in the first signal set, and the first signal set can be sent continuously and normally; the second synchronization signal can be located in the second signal set, and the second signal set can be sent periodically. Since the first synchronization signal is sent using a wide beam and the second synchronization signal is sent using a narrow beam, over a period of time, the number of transmission beams of the first synchronization signal covering the terminal device is greater than the number of transmission beams of the second synchronization signal covering the terminal device.

[0236] In a possible implementation, the second synchronization signal follows the first synchronization signal, and the second synchronization signal is adjacent to the first synchronization signal in time domain.

[0237] Specifically, a first signal set in FIG8 may include multiple time slots, and the position of the first synchronization signal in a time slot in the first signal set is adjacent to the second synchronization signal in a time slot in the associated sent second signal set in the time domain.

[0238] Please continue to refer to Figure 8. In the scenario where the subcarrier spacing is 15kHz, the network device sends the second synchronization signal in the next symbol after sending the first synchronization signal. The first synchronization signal and the second synchronization signal occupy a total of 5 symbols.

[0239] Specifically, in a scenario where the subcarrier spacing is 15kHz, within one time slot in the first signal set, the time domain position of the first synchronization signal is symbol 2 and symbol 8. When the first signal set and the second signal set sent by the network device correspond to the same time slot, the first synchronization signal is located before the time domain position of the second synchronization signal, that is, the time domain position of the second synchronization signal in the time slot is symbol 3 to symbol 6 and symbol 9 to symbol 12.

[0240] Specifically, in a scenario where the subcarrier spacing is 15kHz, within one time slot in the first signal set, the time domain position of the first synchronization signal is symbol 2 and symbol 8. Since the number of second synchronization signals sent by the network device within a period of time may be less than the number of first synchronization signals, when the network device sends the first synchronization signal and the second synchronization signal not in the same time domain, the network device only sends the first synchronization signal at symbol 2 and symbol 8, and there is no need to send the second synchronization signal at symbols 3 to 6 and 9 to 12.

[0241] Furthermore, in a scenario where the subcarrier spacing is 15kHz, in one time slot in which the network device sends the first synchronization signal and the second synchronization signal, in order to coexist with the scenario with a subcarrier spacing of 30kHz, the network device needs to reserve symbol 7 as the downlink control channel of the 30kHz subcarrier when sending the first synchronization signal and the second synchronization signal.

[0242] It should be understood that since the NTN scenario generally adopts the frequency division duplexing (FDD) mode, there is no need to reserve uplink control channel resources in the downlink frame structure sent by the network device, so the second synchronization signal can occupy symbol 12.

[0243] In an embodiment of the present application, the second synchronization signal is adjacent to the corresponding first synchronization signal in time domain, so that the terminal device can immediately detect the second synchronization signal after detecting the first synchronization signal, that is, the terminal device can detect the second synchronization signal in an adjacent and determined time domain, reducing the system overhead of the terminal device.

[0244] In a possible implementation, the second synchronization signal and the first synchronization signal have the same frequency domain center point.

[0245] Specifically, please refer to Figure 8. The first synchronization signal in Figure 8 can be a first main synchronization signal. The frequency domain center point of the first main synchronization signal is aligned with the frequency domain center point of the synchronization signal in each symbol in the second synchronization signal. For example, the frequency domain center point of the first main synchronization signal is aligned with the frequency domain center point of the PSS in the second synchronization signal.

[0246] In an embodiment of the present application, the terminal device can detect the second synchronization signal in the same frequency band as the center point of the frequency domain after detecting the first synchronization signal, thereby reducing the detection overhead of the terminal device.

[0247] FIG9 is a schematic diagram of another broadcast signal structure provided in an embodiment of the present application.

[0248] In a possible implementation, the sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

[0249] Specifically, since the first primary synchronization signal is sent using a wide beam, which will cause a loss of beam gain, the network device may use a longer sequence to enhance beam alignment performance.

[0250] Please refer to Figures 8 and 9. The broadcast signal structure shown in Figure 9 can be used in the frame structure of the broadcast signal design shown in Figure 8. The sequence of the first synchronization signal shown in Figure 8 can be an m sequence, where the length of the m sequence is 2. N -1, the broadcast signal structure in FIG8 can be replaced by the broadcast signal structure shown in FIG9 , that is, the sequence of the first synchronization signal in FIG8 can adopt a longer sequence length, for example, the sequence length of the first synchronization signal is greater than 127.

[0251] For example, the PSS sequence in FIG8 and FIG9 may adopt an m-sequence with a length of 255.

[0252] In an embodiment of the present application, since the beam width of the first main synchronization signal is greater than the beam width of the second main synchronization signal, and the wide beam will cause a loss of beam gain, the network device uses a sequence with a length greater than the second main synchronization signal when sending the first main synchronization signal, which can enable the terminal device to obtain a higher detection peak when detecting the first main synchronization signal, increase the accuracy of the terminal device confirming receipt of the first main synchronization signal, thereby enhancing the performance of beam alignment between the terminal device and the network device, and overcoming the loss of beam gain caused by the wide beam.

[0253] In a possible implementation, the network device repeatedly sends the first synchronization signal on multiple frequency bands.

[0254] In an embodiment of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause a loss of beam gain, the network device repeatedly sends the first synchronization signal on multiple frequency bands, which allows the terminal device to receive a larger number of first synchronization signals within a period of time, increasing the chance of the terminal device receiving the first synchronization signal with a power that meets the requirements, thereby reducing the time required for the terminal device during the initial access process.

[0255] In a possible implementation manner, the network device repeatedly sends the first synchronization signal in the time domain.

[0256] In an embodiment of the present application, since the beam width of the first synchronization signal is greater than the beam width of the second synchronization signal, and the wide beam will cause a loss of beam gain, the network device repeatedly sends the first synchronization signal in the time domain so that more wide-beam first synchronization signals can cover the terminal device within a certain period of time, thereby increasing the chance of the terminal device receiving the first synchronization signal with power that meets the requirements, thereby reducing the time required for the terminal device during the initial access process.

[0257] FIG10 is a flowchart of another terminal device initial access process 1000 provided in an embodiment of the present application.

[0258] It should be understood that in the initial access process of the terminal device shown in Figure 10, the pattern of the synchronization signal block is taken as an example of Figure 9, that is, the first synchronization signal is taken as an example of wide-beam PSS, the second synchronization signal is taken as an example of narrow-beam SSB, and the second main synchronization signal in the second synchronization signal is taken as an example of narrow-beam PSS. The PSS and SSB in Figure 10 may also be other synchronization signals generated based on PCI or part of the content of PCI, and this application does not impose specific restrictions on this.

[0259] S1010: The terminal device selects an optional beam direction to search for a wide-beam PSS. When the terminal device detects the wide-beam PSS, the terminal device measures the PSS power and executes S1020.

[0260] Exemplarily, the terminal device adjusts the direction of a receiving beam every 0.5 ms and attempts to detect the wide-beam PSS.

[0261] S1020: The terminal device determines whether the detected wide beam PSS meets the pointing requirements.

[0262] Specifically, when the wide beam PSS power detected by the terminal device is greater than or equal to a certain threshold, the terminal device executes S1030; when the wide beam PSS power detected by the terminal device is less than the threshold, the terminal device executes S1070.

[0263] Optionally, when the power of the wide-beam PSS detected by the terminal device is greater than or equal to -100dBm, the terminal device searches for the narrow-beam SSS after the wide-beam PSS. When the power of the PSS detected by the terminal device is less than -100dBm, the terminal device adjusts the beam pointing and continues to search for the wide-beam PSS.

[0264] Optionally, the terminal device selects a beam direction with the largest receiving power among all receiving beams to search for the SSS.

[0265] S1070: The wide beam PSS detected by the terminal device does not meet the pointing requirement, the terminal device adjusts the beam pointing and returns to execute S1010.

[0266] S1030: In a possible implementation, the terminal device receives a second synchronization signal, including: receiving the second synchronization signal according to the received first synchronization signal.

[0267] In a possible implementation, receiving the second synchronization signal according to the received first synchronization signal includes: receiving the second synchronization signal according to a receiving beam direction of the first synchronization signal or a receiving beam codebook of the first synchronization signal.

[0268] In a possible implementation, the terminal device may also use the time-frequency resource of the first synchronization signal or the first synchronization signal in the first synchronization signal to obtain the first synchronization signal. A second synchronization signal is received.

[0269] Exemplarily, as shown in FIG10 , after the terminal device detects a wide-beam PSS that meets the pointing requirement, the terminal device searches for a narrow-beam PSS using a beam with the same receiving beam direction as the wide-beam PSS.

[0270] In an embodiment of the present application, the terminal device receives a second synchronization signal based on the received first synchronization signal, and the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals, so that the number of first synchronization signals covering the terminal device within a period of time is greater than the number of second synchronization signals covering the terminal device. Therefore, compared with directly receiving the second synchronization signal, the terminal device can align with the network device more quickly, and then the terminal detects the second synchronization signal based on the alignment with the network device, reducing the time required for the terminal device in the initial access process.

[0271] In a possible implementation, the terminal device detects the narrow beam PSS at the first symbol after detecting the wide beam PSS.

[0272] Specifically, referring to FIG8 , the terminal device detects the narrow-beam PSS in the next symbol after detecting a wide-beam PSS that meets the pointing requirements, i.e., symbol 3 and symbol 9. Because the number of wide-beam PSSs that the terminal device can receive within a period of time is less than the number of narrow-beam PSSs that the terminal device can receive within the same period of time, the narrow-beam PSS may exist in the next symbol after any wide-beam PSS. For the judgment process of the terminal device, please refer to S1040.

[0273] S1040: In one possible implementation, receiving a second synchronization signal includes: receiving a second primary synchronization signal, i.e., a narrow beam PSS, in an SSB based on a received first primary synchronization signal, i.e., a wide beam PSS, the second primary synchronization signal corresponds one-to-one to the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

[0274] In an embodiment of the present application, since the second main synchronization signal corresponds one-to-one to the first main synchronization signal, and the sequence of the second main synchronization signal is determined by the sequence of the first main synchronization signal, that is to say, the terminal device can determine the information of the second main synchronization signal based on the information in the received first main synchronization signal, and thus the terminal device does not need to perform blind detection when receiving the second main synchronization signal, thereby saving the detection overhead of the terminal device.

[0275] Specifically, if the terminal device detects the narrow beam PSS, the terminal device executes S1050, ie, detects the narrow beam SSS; if the terminal device does not detect the narrow beam PSS, the terminal device executes S1080.

[0276] S1080: The terminal device keeps the receiving beam direction unchanged and attempts to detect the next wide-beam PSS. After detecting the next wide-beam PSS that meets the pointing requirements, the terminal device returns to execute S1030, that is, the terminal device detects the narrow-beam PSS in the next symbol after detecting the next wide-beam PSS that meets the pointing requirements.

[0277] S1050: The terminal device detects the narrow beam SSS.

[0278] In a possible implementation, the terminal device receives the secondary synchronization signal SSS in the SSB based on the received second primary synchronization signal, namely the narrow beam PSS.

[0279] In the embodiment of the present application, when the terminal device detects the second main synchronization signal, it detects the second synchronization signal. Therefore, there must be a narrow beam SSS after the second main synchronization signal. Then, the terminal device avoids repeating the SSS blind detection operation to confirm whether a certain symbol is SSS, thereby reducing the blind detection overhead of the narrow beam SSS.

[0280] In a possible implementation, the terminal device detects the narrow beam SSS in the second symbol after detecting the narrow beam PSS.

[0281] It should be understood that the time domain positions of the synchronization signals and the positional relationships between the synchronization signals in the time domain in the embodiments of the present application are merely examples, and the present application does not impose any specific restrictions on this.

[0282] Specifically, the SSS must exist after the narrow beam PSS. For example, the SSS can be located in the second symbol after the narrow beam PSS. Therefore, when the terminal device detects the SSS, it only needs to perform a blind detection at a certain time domain position to detect the SSS, saving the system overhead of the terminal device.

[0283] Exemplarily, the index of the SSS in the second signal may be 336, and the signal detected by the terminal device in the second symbol after the detected narrow beam PSS must be one of the signal sequences corresponding to the index of the 336 SSSs.

[0284] S1060: In a possible implementation, the terminal device receives the physical broadcast channel PBCH according to the second primary synchronization signal, ie, the narrow beam PSS and SSS, and performs initial access.

[0285] Specifically, the terminal device detects the PSS and SSS and Calculate N ID , parse the PBCH in the second synchronization signal, obtain the PBCH payload and MIB, further parse the SIB message, and the terminal device completes the initial access according to the MIB message and SIB message.

[0286] In one possible implementation, during the initial access process shown in Figure 10, the terminal device performs beam scanning, searches for the wide-beam PSS in different beam directions and detects the power of the wide-beam PSS. When the detected wide-beam PSS power meets the access requirements, that is, the beam direction meets the pointing requirements, the terminal device searches for the narrow-beam PSS sent by the network device after the wide-beam PSS. If the terminal device cannot search for a wide-beam PSS with a power that meets the access requirements in one beam direction, it means that the beam pointing currently selected by the terminal device does not meet the pointing requirements. The terminal device continues to adjust the beam pointing, and the terminal device continues to try to search for the PSS on the adjusted beam pointing.

[0287] FIG11 is a schematic diagram of another broadcast signal design provided in an embodiment of the present application.

[0288] Specifically, the broadcast signal design schematic diagram shown in Figure 11 takes a scenario with a subcarrier spacing of 30 kHz as an example. The second synchronization signal can be located in a second signal set, which can include four second synchronization signals, occupying the first time slot pair of one half frame. The first synchronization signal can be located in a first signal set, which can include multiple time slot pairs including the first synchronization signal shown in Figure 11.

[0289] Specifically, in a scenario where the subcarrier spacing is 30kHz, within one time slot pair in the first signal set, the time domain position of the first synchronization signal is symbol 4 and symbol 9 in the first time slot within the time slot pair, and symbol 2 and symbol 7 in the second time slot within the time slot pair. When the first synchronization signal and the second synchronization signal sent by the network device correspond to the same time domain, the time domain position of the second synchronization signal in the first time slot within the time slot pair is symbol 5 to symbol 8 and symbol 10 to symbol 13, and the time domain position of the narrow beam SSB in the second time slot within the time slot pair is symbol 3 to symbol 6 and symbol 8 to symbol 11.

[0290] It should be understood that the time domain positions of the synchronization signals and the positional relationships between the synchronization signals in the time domain in the embodiments of the present application are merely examples, and the present application does not impose any specific restrictions on this.

[0291] Specifically, in a scenario where the subcarrier spacing is 30kHz, within one time slot in the first signal set, the time domain position of the first synchronization signal is symbol 4 and symbol 9 in the first time slot in the time slot pair, and symbol 2 and symbol 7 in the second time slot in the time slot pair. In an embodiment of the present application, since the number of first synchronization signals covering terminal devices within a period of time is greater than the number of second synchronization signals covering terminal devices, when the first signal set and the second signal set sent by the network device do not correspond to the same time domain, the network device only sends the first synchronization signal in symbols 4 and symbol 9 in the first time slot in the time slot pair, and symbols 2 and symbol 7 in the second time slot in the time slot pair, and there is no need to send the second synchronization signal correspondingly after the first synchronization signal.

[0292] Furthermore, in the scenario where the subcarrier spacing is 30kHz, in the one time slot in which the network device sends the first synchronization signal and the second synchronization signal, in order to coexist with the scenario with a 30kHZ subcarrier spacing, the network device needs to reserve symbol 7 as the downlink control channel of the 30kHz subcarrier when sending the first synchronization signal and the second synchronization signal.

[0293] It should be understood that since the NTN scenario usually adopts the frequency division duplexing (FDD) mode, there is no need to reserve uplink control channel resources in the downlink frame structure sent by the network device. Therefore, in the scenario where the subcarrier spacing is 30kHz, the positions of the first synchronization signal and the second synchronization signal within a time slot pair can also be located at other positions that do not affect the downlink control channel. The above-mentioned downlink control channel is the downlink control channel in each subcarrier frame structure when 30kHz and 15kHz coexist.

[0294] Specifically, in a scenario where the subcarrier spacing is 30kHz, in a time slot pair in which the network device sends the first synchronization signal and the second synchronization signal, the network device reserves symbols 0 to 3 in the first time slot in the time slot pair, where symbols 0 and 1 serve as downlink control channels in the 30kHz subcarrier scenario, and symbols 0 to 3 correspond to symbols 0 and 1 in the first time slot in the 15kHz subcarrier scenario, as downlink control channels in the coexisting 15kHz subcarrier scenario. The network device reserves symbols 0 and 1 in the second time slot in the time slot pair as the downlink control channel of the second time slot in the time slot pair, and the remaining symbol positions can be used to carry the first synchronization signal and the second synchronization signal.

[0295] Exemplarily, within one time slot pair in the first signal set, the position of the first synchronization signal can be symbol 4, symbol 9 in the first time slot within the time slot pair and symbol 4, symbol 9 in the second time slot within the time slot pair, and the second synchronization signal is after the first synchronization signal and adjacent to the position of the first synchronization signal, that is, the second synchronization signal is located at symbols 5 to 8, symbols 10 to 13 in the first time slot within the time slot pair and symbols 5 to 8, symbols 10 to 13 in the second time slot within the time slot pair.

[0296] It should be understood that in the scenario where the subcarrier spacing is 30kHz, the broadcast signal structure sent by the network device can be as shown in Figure 9, and the initial access process of the terminal device can be as shown in Figure 10. The specific steps are similar to the above content, and the embodiments of this application will not be repeated here.

[0297] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application.

[0298] The device 1200 includes a transceiver unit 1210 and a processing unit 1220 , wherein the transceiver unit 1210 can be used to implement corresponding communication functions, and the processing unit 1220 can be used to perform data processing.

[0299] Optionally, the transceiver unit 1210 may also be referred to as a communication interface or communication unit, and may include a transmitting unit and / or a receiving unit. The transceiver unit 1210 may be a transceiver (including a transmitter and / or a receiver), an input / output interface (including an input and / or output interface), a pin, or a circuit. The transceiver unit 1210 may be configured to perform the transmitting and / or receiving steps in the above-described method embodiments.

[0300] Optionally, the processing unit 1220 may be a processor (may include one or more), a processing circuit with processor functions, etc., and may be used to execute other steps except sending and receiving in the above method embodiment.

[0301] Optionally, the apparatus 1200 further includes a storage unit, which may be a memory, an internal storage unit (e.g., a register, a cache, etc.), an external storage unit (e.g., a read-only memory, a random access memory, etc.), etc. The storage unit is used to store instructions, and the processing unit 1220 executes the instructions stored in the storage unit to cause the communication apparatus to perform the above method.

[0302] In one design, the apparatus 1200 may be used to perform the actions performed by the terminal device in each of the above method embodiments. For example, the apparatus 1200 may be used to perform the actions performed by the terminal device in the above method 600 or 1000. In this case, the apparatus 1200 may be a component of the terminal device, the transceiver unit 1210 is used to perform the transceiver-related operations of the terminal device in the above method embodiments, and the processing unit 1220 is used to perform the processing-related operations of the terminal device in the above method embodiments.

[0303] For example, the transceiver unit 1210 is used to receive a first synchronization signal; the transceiver unit 1210 is also used to receive a second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beam of multiple second synchronization signals; the processing unit 1220 is used to receive the physical broadcast channel PBCH according to the second main synchronization signal and SSS.

[0304] It should be understood that the transceiver unit 1210 and the processing unit 1220 can also perform other operations performed by the terminal device in any step of the above method 600 or 1000, which will not be described in detail here.

[0305] In one design, the device 1200 can be used to perform the actions performed by the network device in the above method embodiments, for example, the transceiver unit 1210 is used to send a first synchronization signal; the transceiver unit 1210 is also used to send a second synchronization signal, the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage range of the transmission beams of multiple second synchronization signals.

[0306] It should also be understood that the device 1200 here is embodied in the form of a functional unit. The term "unit" here can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (such as a shared processor, a dedicated processor or a group processor, etc.) and a memory for executing one or more software or firmware programs, a combined logic circuit and / or other suitable components that support the described functions. In an optional example, those skilled in the art will understand that the device 1200 can be specifically a network device in the above-mentioned embodiment, and can be used to execute the various processes and / or steps corresponding to the network device in the above-mentioned method embodiments. To avoid repetition, they will not be described here.

[0307] The apparatus 1200 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the terminal device in the above-mentioned method, or the apparatus 1200 of each of the above-mentioned solutions has the function of implementing the corresponding steps performed by the network device in the above-mentioned method. The functions can be implemented by hardware, or the corresponding software can be implemented by hardware. The hardware or software includes one or more modules corresponding to the above-mentioned functions; for example, the transceiver unit can be replaced by a transceiver (for example, the sending unit in the transceiver unit can be replaced by a transmitter, and the receiving unit in the transceiver unit can be replaced by a receiver), and other units, such as the processing unit, can be replaced by a processor to respectively perform the sending and receiving operations and related processing operations in each method embodiment.

[0308] In addition, the transceiver unit 1210 may also be a transceiver circuit (for example, may include a receiving circuit and a transmitting circuit), and the processing unit may be a processing circuit.

[0309] It should be noted that the device in Figure 1200 can be a network element or device in the aforementioned embodiment, or a chip or chip system, such as a system on chip (SoC). The transceiver unit can be an input / output circuit or a communication interface; the processing unit can be a processor, microprocessor, or integrated circuit integrated on the chip. This is not limited here.

[0310] Figure 13 is a schematic diagram of a communication architecture provided in an embodiment of the present application. The communication device 1300 shown in Figure 13 includes a processor 1310, a memory 1320, and a transceiver 1330. The processor 1310 is coupled to the memory 1320 and is configured to execute instructions stored in the memory 1320 to control the transceiver 1330 to transmit and / or receive signals.

[0311] It should be understood that the processor 1310 and memory 1320 described above can be combined into a single processing device, with the processor 1310 configured to execute program code stored in the memory 1320 to implement the aforementioned functions. In a specific implementation, the memory 1320 can also be integrated into the processor 1310 or independent of the processor 1310. It should be understood that the processor 1310 can also correspond to the various processing units in the aforementioned communication device, and the transceiver 1330 can correspond to the various receiving units and transmitting units in the aforementioned communication device.

[0312] It should also be understood that the transceiver 1330 may include a receiver (or receiver) and a transmitter (or transmitter). The transceiver may further include an antenna, and the number of antennas may be one or more. The transceiver may also be a communication interface or interface circuit.

[0313] Specifically, the communication device 1300 may correspond to the terminal device in method 600 or method 1000 according to an embodiment of the present application. The communication device 1300 may include the units of the method in method 600 or method 1000 performed by the terminal device. It should be understood that the specific process of each unit performing the above-mentioned corresponding steps has been described in detail in the above-mentioned method embodiments and will not be repeated here for the sake of brevity.

[0314] When the communication device 1300 is a chip, the chip includes an interface unit and a processing unit, wherein the interface unit may be an input / output circuit or a communication interface; and the processing unit may be a processor, microprocessor, or integrated circuit integrated on the chip.

[0315] During implementation, each step of the above method can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The steps of the method disclosed in conjunction with the embodiments of the present application can be directly embodied as being executed by a hardware processor, or can be executed by a combination of hardware and software modules in the processor. The software module can be located in a storage medium mature in the art such as a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in conjunction with its hardware. To avoid repetition, it will not be described in detail here.

[0316] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with signal processing capabilities. During implementation, each step of the above method embodiment can be completed by an integrated logic circuit of the hardware in the processor or by instructions in the form of software. The above processor can be a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic device, a discrete gate or transistor logic device, or a discrete hardware component. The various methods, steps, and logic block diagrams disclosed in the embodiments of the present application can be implemented or executed. The general-purpose processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in the embodiments of the present application can be directly embodied as being executed by a hardware decoding processor, or can be executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a storage medium mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, or electrically erasable programmable memory, registers, etc. The storage medium is located in the memory, and the processor reads the information in the memory and completes the steps of the above method in combination with its hardware.

[0317] The present application also provides a computer-readable medium having a computer program stored thereon, which implements the functions of any of the above method embodiments when executed by a computer.

[0318] The present application also provides a computer program product, which implements the functions of any of the above method embodiments when executed by a computer.

[0319] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of the present application are generated. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via a wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) method. The computer-readable storage medium may be any available medium that a computer can access or a data storage device such as a server or data center that includes one or more available media integrated therein. The available medium may be a magnetic medium (eg, a floppy disk, a hard disk, a magnetic tape), an optical medium (eg, a high-density digital video disc (DVD)), or a semiconductor medium (eg, a solid state disk (SSD)).

[0320] In the embodiments of this application, words such as "exemplary" and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" should not be construed as preferred or advantageous over other embodiments or designs. Rather, the use of the word "exemplary" is intended to present concepts in a concrete way.

[0321] It should be understood that references to "embodiments" throughout this specification mean that a particular feature, structure, or characteristic associated with the embodiment is included in at least one embodiment of the present application. Therefore, various embodiments throughout this specification do not necessarily refer to the same embodiment. Furthermore, these particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0322] It should be understood that in the various embodiments of the present application, the size of the sequence number of each process does not mean the order of execution, and 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 embodiment of the present application. The names of all nodes and messages in this application are merely names set by this application for the convenience of description. The names in the actual network may be different. It should not be understood that this application limits the names of various nodes and messages. On the contrary, any name with the same or similar function as the node or message used in this application is regarded as the method or equivalent replacement of this application, and is within the scope of protection of this application.

[0323] It should also be understood that in this application, "when", "if" and "if" all mean that the terminal device or base station will make corresponding processing under certain objective circumstances. It does not limit the time, and does not require the terminal device or base station to make a judgment action when implementing it, nor does it mean that there are other limitations.

[0324] Additionally, the terms "system" and "network" are often used interchangeably. The term "and / or" is simply used to describe an association between related objects, indicating that three possible relationships exist. For example, "A and / or B" can mean: A exists alone, A and B exist simultaneously, or B exists alone.

[0325] As used herein, the term "at least one of" or "at least one of" refers to all or any combination of the listed items. For example, "at least one of A, B, and C" can mean: A alone, B alone, C alone, A and B together, B and C together, and A, B, and C together. As used herein, "at least one" means one or more. "A plurality" means two or more.

[0326] It should be understood that in the various embodiments of the present application, "B corresponding to A" means that B is associated with A and can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information. The terms "include," "comprising," "having," and their variations all mean "including but not limited to," unless otherwise specifically emphasized.

[0327] It should be understood that in various embodiments of the present application, the first, second, and various numerical numbers are merely distinctions for ease of description and are not intended to limit the scope of the embodiments of the present application.

[0328] Those skilled in the art will appreciate that the units and algorithm steps of each example 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 performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel 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.

[0329] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0330] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0331] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0332] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0333] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0334] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of this application. Therefore, the scope of protection of this application should be based on the scope of protection of the claims.

Claims

1. A communication method, characterized in that, including: receiving a first synchronization signal; receiving a second synchronization signal, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of a plurality of the transmission beams of the second synchronization signal.

2. The method according to claim 1, wherein Within a first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

3. The method according to claim 1 or 2, characterized in that, The receiving the second synchronization signal includes: receiving the second synchronization signal according to the received first synchronization signal.

4. The method according to claim 3, characterized in that The receiving the second synchronization signal according to the received first synchronization signal includes: receiving the second synchronization signal according to the receiving beam direction of the first synchronization signal or the receiving beam codebook of the first synchronization signal.

5. The method according to any one of claims 1 to 4, characterized in that, The second synchronization signal has the same frequency domain center point as the first synchronization signal.

6. The method according to any one of claims 1 to 5, characterized in that The first synchronization signal includes a synchronization signal generated according to a physical cell identifier (PCI) or a part of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the PCI.

7. The method according to any one of claims 1 to 6, characterized in that, The first synchronization signal includes a primary synchronization signal (PSS), and the second synchronization signal includes a secondary synchronization signal (SSS).

8. The method according to claim 7, characterized in that, The sequence length of the PSS is greater than the sequence length of the SSS.

9. The method according to any one of claims 1 to 6, characterized in that, The first synchronization signal includes a first primary synchronization signal, and the second synchronization signal includes a synchronization broadcast block (SSB).

10. The method according to claim 9, characterized in that, The receiving the second synchronization signal includes: receiving a second primary synchronization signal in the SSB according to the received first primary synchronization signal, the second primary synchronization signal corresponding one-to-one to the first primary synchronization signal, and the sequence of the second primary synchronization signal being determined by the sequence of the first primary synchronization signal.

11. The method according to claim 9 or 10, characterized in that, The sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

12. The method according to claim 10 or 11, characterized in that, The receiving the second synchronization signal further includes: receiving the SSS in the SSB according to the received second primary synchronization signal.

13. The method according to claim 12, characterized in that further including: receiving a physical broadcast channel (PBCH) according to the second primary synchronization signal and the SSS.

14. The method according to any one of claims 1 to 13, characterized in that, The first synchronization signal is repeatedly transmitted on multiple frequency bands.

15. A communication method, characterized in that, including: transmitting a first synchronization signal; transmitting a second synchronization signal, wherein the width of the transmission beam of the first synchronization signal is greater than the width of the transmission beam of the second synchronization signal, and the coverage range of the transmission beam of the first synchronization signal includes the coverage ranges of a plurality of the transmission beams of the second synchronization signal.

16. The method according to claim 15, wherein Within a first time length, the number of the first synchronization signals is greater than or equal to the number of the second synchronization signals.

17. The method according to claim 15 or 16, characterized in that, The second synchronization signal has the same frequency domain center point as the first synchronization signal.

18. The method according to any one of claims 15 to 17, characterized in that, The first synchronization signal includes a synchronization signal generated according to a physical cell identifier (PCI) or a part of the PCI, and the second synchronization signal includes a synchronization signal generated according to the PCI or a part of the PCI.

19. The method according to any one of claims 15 to 18, characterized in that, The first synchronization signal includes a first primary synchronization signal (PSS), and the second synchronization signal includes a secondary synchronization signal (SSS).

20. The method according to claim 19, wherein The sequence length of the primary synchronization signal is greater than the sequence length of the secondary synchronization signal.

21. The method according to any one of claims 15 to 18, characterized in that, The first synchronization signal includes a first primary synchronization signal PSS, the second synchronization signal includes a synchronization broadcast block SSB, the SSB includes a second primary synchronization signal, the second primary synchronization signal corresponds one-to-one with the first primary synchronization signal, and the sequence of the second primary synchronization signal is determined by the sequence of the first primary synchronization signal.

22. The method according to claim 21, wherein The sequence length of the first primary synchronization signal is greater than the sequence length of the second primary synchronization signal.

23. The method according to any one of claims 15 to 22, characterized in that The sending of the first synchronization signal includes: Repeatedly sending the first synchronization signal on multiple frequency bands.

24. A communication device, characterized in that, The communication device is used to execute the method according to any one of claims 1 to 14 or claims 15 to 23.

25. A communication device, characterized in that, It includes a processor, and the processor is configured to cause the communication device to execute the method according to any one of claims 1 to 14, or is configured to cause the communication device to execute the method according to any one of claims 15 to 23.

26. The communication device according to claim 25, wherein It further includes a memory, and the processor is used to call the computer program instructions stored in the memory to execute the method according to any one of claims 1 to 14, or the method according to any one of claims 15 to 23.

27. A computer-readable storage medium, characterized in that, Computer instructions are stored in the computer-readable storage medium, and when the computer instructions are run on a computer, the method according to any one of claims 1 to 14 is executed, or the method according to any one of claims 15 to 23 is executed.

28. A computer program product, characterized in that, The computer program product includes computer program code, and when the computer program code is run on a computer, the method according to any one of claims 1 to 14 is executed, or the method according to any one of claims 15 to 23 is executed.

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