Communication method and communication apparatus

Abstract

Provided in the present application are a communication method and a communication apparatus. A terminal device receives synchronization resource blocks from a network device over N cycles, wherein a physical broadcast channel carried on the synchronization resource block separately received in each cycle is divided into a plurality of physical broadcast sub-channels, and the physical broadcast sub-channels carried on first frequency-domain units of the synchronization resource blocks in the N cycles are different. When the terminal device is a narrow-bandwidth terminal device, i.e., when a bandwidth supported by the terminal device is less than a bandwidth corresponding to a synchronization resource block (e.g., the terminal device can only receive, in each cycle, the physical broadcast sub-channels carried on a first frequency-domain unit), the narrow-bandwidth terminal device can access the network device on the basis of the physical broadcast sub-channels carried on the first frequency-domain units of the synchronization resource blocks respectively received in the N cycles, such that the narrow-bandwidth terminal device is enabled to access the network device.

Description

Communication method and communication apparatus

[0001] This application claims priority to the Chinese Patent Application No. 202411311235.2, filed on September 19, 2024, and entitled "Communication method and communication apparatus", the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and more particularly, to a communication method and a communication apparatus. BACKGROUND

[0003] In the initial access process of the fifth generation (5G) new radio (NR), a base station periodically sends a synchronization signal block (SSB) to a terminal, and the terminal uses the synchronization signal in the SSB to achieve downlink time and frequency synchronization with the base station, ensuring the stability and accuracy of subsequent data transmission.

[0004] Currently, one SSB is composed of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a physical broadcast channel (PBCH). One SSB occupies 4 symbols in the time domain and 20 resource blocks (RBs) in the frequency domain. Since the SSB includes the PBCH occupying the entire 20 RBs in the frequency domain, the current SSB cannot support small bandwidth terminal devices (for example, 5MHz terminals) to obtain complete PBCH, and thus according to the current SSB, small bandwidth terminal devices cannot access network devices.

[0005] Therefore, how to enable small bandwidth terminal devices to access network devices needs to be solved urgently. SUMMARY

[0006] The present application provides a communication method and a communication apparatus, which can enable small bandwidth terminals to access network devices.

[0007] In a first aspect, a communication method is provided, applied to a terminal device, and includes: receiving, in N periods, a synchronization resource block from a network device, a physical broadcast channel carried on the synchronization resource block is divided into a plurality of physical broadcast sub-channels, and the physical broadcast sub-channels carried on a first frequency domain unit of the synchronization resource blocks in the N periods are different, a bandwidth of the first frequency domain unit is smaller than a bandwidth corresponding to the synchronization resource block, and the first frequency domain unit is located within a bandwidth range supported by the terminal device, N is an integer greater than 1; and accessing the network device according to the physical broadcast sub-channels carried on the first frequency domain unit of the synchronization resource blocks in the N periods.

[0008] Based on the above scheme, the terminal device can receive the synchronization resource block from the network device in N periods, the physical broadcast channel carried on the synchronization resource block received in each period is divided into a plurality of physical broadcast sub-channels, and the physical broadcast sub-channels carried on the first frequency domain unit of the synchronization resource blocks in the N periods are different. When the terminal device is a small-bandwidth terminal device, i.e., the bandwidth supported by the terminal device is smaller than the bandwidth corresponding to the synchronization resource block, for example, the terminal device can only receive the physical broadcast sub-channel carried on the first frequency domain unit in each period, and the small-bandwidth terminal device can access the network device according to the physical broadcast sub-channels carried on the first frequency domain unit of the synchronization resource blocks received in the N periods, thereby enabling the small-bandwidth terminal device to access the network device.

[0009] In combination with the first aspect, in some implementations of the first aspect, a center frequency point of the first frequency domain unit corresponds to a center frequency point of the synchronization resource block.

[0010] Based on the above scheme, the first frequency domain unit is located within the bandwidth range supported by the terminal device, and the center frequency point of the first frequency domain unit corresponds to the center frequency point of the synchronization resource block, i.e., the first frequency domain unit is located at the center of the bandwidth of the synchronization resource block in the frequency domain, to adapt to the small-bandwidth terminal device that can only detect the center of the bandwidth of the synchronization resource block.

[0011] In combination with the first aspect, in some implementations of the first aspect, the first frequency domain unit is located at an edge of the bandwidth of the synchronization resource block in the frequency domain.

[0012] Based on the above scheme, the first frequency domain unit is located within the bandwidth range supported by the terminal device, and the first frequency domain unit is located at the edge of the bandwidth of the synchronization resource block in the frequency domain, to adapt to the small-bandwidth terminal device that can only detect the edge of the bandwidth of the synchronization resource block.

[0013] In combination with the first aspect, in some implementations of the first aspect, the value of N is 2.

[0014] Based on the above scheme, when the value of N is 2, the terminal device can access the network device by receiving the physical broadcast subchannel carried on the first frequency domain unit of the synchronization resource block received in two periods.

[0015] In combination with the first aspect, in some implementations of the first aspect, the plurality of physical broadcast subchannels traverse the first frequency domain unit of the synchronization resource block in the N periods through cyclic shift in the frequency domain or resource mapping position variation in the frequency domain.

[0016] Based on the above scheme, the plurality of physical broadcast subchannels traverse the first frequency domain unit of the synchronization resource block in the N periods, so that the terminal device can receive all the plurality of physical broadcast subchannels in the N periods, and access the network device through the received plurality of physical broadcast subchannels.

[0017] In combination with the first aspect, in some implementations of the first aspect, the synchronization resource block in the n th period and the synchronization resource block in the n+1 th period in the N periods satisfy the following relationship: the physical broadcast subchannel carried on the first frequency domain unit of the synchronization resource block in the n+1 th period is the same as the physical broadcast subchannel carried on the second frequency domain unit of the synchronization resource block in the n th period, the frequency domain mapping position interval between the first frequency domain unit and the second frequency domain unit is a preset value, and n=1, 2, …, N-1.

[0018] Based on the above scheme, the physical broadcast subchannel carried on the first frequency domain unit of the synchronization resource block in the n+1 th period is the same as the physical broadcast subchannel carried on the second frequency domain unit of the synchronization resource block in the n th period, and the physical broadcast subchannels carried on the first frequency domain units of the synchronization resource blocks in different periods are different, and n=1, 2, …, N-1, that is, the physical broadcast subchannels carried on the first frequency domain units of the synchronization resource blocks in the N periods are obtained by traversing the plurality of physical broadcast subchannels in the N periods, so that the terminal device can receive the plurality of physical broadcast subchannels in the first frequency domain unit to access the network device.

[0019] In combination with the first aspect, in some implementations of the first aspect, the synchronization resource block is further used to carry a primary synchronization signal and a secondary synchronization signal, and the primary synchronization signal and / or the secondary synchronization signal are used to indicate the position of the frequency domain unit occupied by the plurality of physical broadcast subchannels.

[0020] According to the above scheme, the primary synchronization signal and / or the secondary synchronization signal in each synchronization resource block can indicate the frequency domain position of the N PBCHs carried in each synchronization resource block, so that the terminal device can determine whether the frequency domain position of the received physical broadcast channel carried in the first frequency domain unit is the changed frequency domain position, so that the subsequent small-bandwidth terminal device can access the network device after the physical broadcast channel carried in the first frequency domain unit of the synchronization resource block received in N cycles is recombined and recovered in the frequency domain.

[0021] In a second aspect, a communication method is provided, which is applied to a terminal device and includes: receiving, in N cycles, a synchronization resource block from a network device, each synchronization resource block including a plurality of physical broadcast channels, the plurality of physical broadcast channels being used for the terminal device to access the network device, the physical broadcast channels carried in a first frequency domain unit of the N-cycle synchronization resource blocks being different, a bandwidth of the first frequency domain unit being smaller than a bandwidth corresponding to the synchronization resource block, and the first frequency domain unit being located within a bandwidth range supported by the terminal device, N being an integer greater than 1; and accessing the network device according to the physical broadcast channels carried in the first frequency domain unit of the N-cycle synchronization resource blocks.

[0022] In combination with the second aspect, in some implementations of the second aspect, a center frequency point of the first frequency domain unit corresponds to a center frequency point of the synchronization resource block.

[0023] In combination with the second aspect, in some implementations of the second aspect, the first frequency domain unit is located at a bandwidth edge of the synchronization resource block in the frequency domain.

[0024] In combination with the second aspect, in some implementations of the second aspect, a value of N is 2.

[0025] In combination with the second aspect, in some implementations of the second aspect, the plurality of physical broadcast channels traverse the first frequency domain unit of the N-cycle synchronization resource blocks through cyclic shift in the frequency domain or resource mapping position variation in the frequency domain.

[0026] In combination with the second aspect, in some implementations of the second aspect, the following relationship is satisfied between the synchronization resource block in the n th cycle and the synchronization resource block in the n+1 th cycle of the N-cycle synchronization resource blocks: the physical broadcast channel carried in the first frequency domain unit of the synchronization resource block in the n+1 th cycle is the same as the physical broadcast channel carried in the second frequency domain unit of the synchronization resource block in the n th cycle, a frequency domain mapping position interval between the first frequency domain unit and the second frequency domain unit is a preset value, and n=1, 2, …, N-1.

[0027] With reference to the second aspect, in some implementations of the second aspect, the synchronization resource block is further configured to carry a primary synchronization signal and a secondary synchronization signal, the primary synchronization signal and / or the secondary synchronization signal being used to indicate a location of the frequency domain units occupied by the plurality of physical broadcast channels.

[0028] In a third aspect, a communication method is provided. The method is applied to a network device and includes: transmitting, to a terminal device, synchronization resource blocks in N periods respectively, a physical broadcast channel carried on the synchronization resource blocks being divided into a plurality of physical broadcast sub-channels, the plurality of physical broadcast sub-channels being used by the terminal device to access the network device, and a physical broadcast sub-channel carried on a first frequency domain unit of the synchronization resource blocks in the N periods being different, a bandwidth of the first frequency domain unit being smaller than a bandwidth corresponding to the synchronization resource block, and the first frequency domain unit being located within a bandwidth range supported by the terminal device, N being an integer greater than 1.

[0029] With reference to the third aspect, in some implementations of the third aspect, a center frequency point of the first frequency domain unit corresponds to a center frequency point of the synchronization resource block.

[0030] With reference to the third aspect, in some implementations of the third aspect, the first frequency domain unit is located at a bandwidth edge of the synchronization resource block in the frequency domain.

[0031] With reference to the third aspect, in some implementations of the third aspect, a value of N is 2.

[0032] With reference to the third aspect, in some implementations of the third aspect, the plurality of physical broadcast sub-channels traverse the first frequency domain unit of the synchronization resource blocks in the N periods through cyclic shift in the frequency domain or resource mapping position variation in the frequency domain.

[0033] With reference to the third aspect, in some implementations of the third aspect, a relationship between a synchronization resource block in an n th period and a synchronization resource block in an n+1 th period of the N periods is that a physical broadcast sub-channel carried on the first frequency domain unit of the synchronization resource block in the n+1 th period is the same as a physical broadcast sub-channel carried on a second frequency domain unit of the synchronization resource block in the n th period, a frequency domain mapping position interval between the second frequency domain unit and the first frequency domain unit being a preset value, n=1, 2, …, N-1.

[0034] With reference to the third aspect, in some implementations of the third aspect, the synchronization resource block is further configured to carry a primary synchronization signal and a secondary synchronization signal, the primary synchronization signal and / or the secondary synchronization signal being used to indicate a location of the frequency domain units occupied by the plurality of physical broadcast sub-channels.

[0035] In a fourth aspect, a communication method is provided, applied to a network device, including: transmitting, to a terminal device, synchronization resource blocks in N periods respectively, each synchronization resource block including a plurality of physical broadcast channels, the plurality of physical broadcast channels being used by the terminal device to access the network device, the physical broadcast channels carried on a first frequency domain unit of the synchronization resource blocks in the N periods being different, a bandwidth of the first frequency domain unit being smaller than a bandwidth of the synchronization resource block, and the first frequency domain unit being located within a bandwidth range supported by the terminal device, N being an integer greater than 1.

[0036] With reference to the fourth aspect, in some implementations of the fourth aspect, a center frequency point of the first frequency domain unit corresponds to a center frequency point of the synchronization resource block.

[0037] With reference to the fourth aspect, in some implementations of the fourth aspect, the first frequency domain unit is located at a bandwidth edge of the synchronization resource block in the frequency domain.

[0038] With reference to the fourth aspect, in some implementations of the fourth aspect, a value of N is 2.

[0039] With reference to the fourth aspect, in some implementations of the fourth aspect, the plurality of physical broadcast channels traverse the first frequency domain unit of the synchronization resource blocks in the N periods through cyclic shift in the frequency domain or resource mapping position variation in the frequency domain.

[0040] With reference to the fourth aspect, in some implementations of the fourth aspect, the synchronization resource block in the n th period and the synchronization resource block in the n+1 th period of the N periods satisfy the following relationship: the physical broadcast channels carried on the first frequency domain unit of the synchronization resource block in the n+1 th period are the same as the physical broadcast channels carried on a second frequency domain unit of the synchronization resource block in the n th period, a frequency domain mapping position interval between the first frequency domain unit and the second frequency domain unit is a preset value, and n=1, 2, …, N-1.

[0041] With reference to the fourth aspect, in some implementations of the fourth aspect, the synchronization resource block is further used to carry a primary synchronization signal and a secondary synchronization signal, the primary synchronization signal and / or the secondary synchronization signal being used to indicate a position of a frequency domain unit occupied by the plurality of physical broadcast channels.

[0042] The technical effects of the methods shown in the above second aspect to fourth aspect and possible designs thereof can refer to the technical effects in the first aspect and possible designs thereof.

[0043] In a fifth aspect, a communication apparatus is provided. The communication apparatus is configured to implement the first aspect and any of the implementation forms thereof. Specifically, the communication apparatus includes a processor and a memory storing a computer program. The processor is configured to invoke and run the computer program from the memory, so that the communication apparatus implements the first aspect, the second aspect and any of the implementation forms thereof.

[0044] In an implementation form, the communication apparatus is a terminal device. When the communication apparatus is a terminal device, the transceiver unit can be a transceiver, or an input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0045] In another implementation form, the communication apparatus can be a chip, a chip system or a circuit in a terminal device. In this case, the transceiver unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuitry, etc. on the chip, the chip system or the circuit; the processing unit can be at least one processor, a processing circuit or a logic circuit, etc.

[0046] In a sixth aspect, a communication apparatus is provided. The communication apparatus is configured to implement the third aspect and any of the implementation forms thereof. Specifically, the communication apparatus includes a processor and a memory storing a computer program. The processor is configured to invoke and run the computer program from the memory, so that the communication apparatus implements the third aspect, the fourth aspect and any of the implementation forms thereof.

[0047] In an implementation form, the communication apparatus is a network device. When the communication apparatus is a network device, the transceiver unit can be a transceiver, or an input / output interface. The processing unit can be at least one processor. Optionally, the transceiver can be a transceiver circuit. Optionally, the input / output interface can be an input / output circuit.

[0048] In another implementation form, the communication apparatus can be a chip, a chip system or a circuit in a network device. In this case, the transceiver unit can be an input / output interface, an interface circuit, an output circuit, an input circuit, a pin or related circuitry, etc. on the chip, the chip system or the circuit; the processing unit can be at least one processor, a processing circuit or a logic circuit, etc.

[0049] In a seventh aspect, a computer readable storage medium is provided. The computer readable storage medium stores a computer program which, when executed, causes the method of any of the implementation forms of the first aspect and the fourth aspect to be performed.

[0050] In an eighth aspect, a computer program product including instructions is provided. When the computer program product is run, the method provided by any one of the first aspect and the fourth aspect and any one of the implementation manners is executed.

[0051] In a ninth aspect, a chip is provided. The chip includes a processor and a communication interface. The processor reads instructions through the communication interface, and executes the method provided by any one of the first aspect and the fourth aspect and any one of the implementation manners.

[0052] Optionally, as an implementation manner, the chip further includes a memory. The memory stores a computer program or instructions. The processor is configured to execute the computer program or instructions stored on the memory. When the computer program or instructions are executed, the processor is configured to execute the method provided by any one of the first aspect and the fourth aspect and any one of the implementation manners.

[0053] In a tenth aspect, a communication system is provided. The communication system includes the communication device of the fifth aspect and the communication device of the sixth aspect.

[0054] In an eleventh aspect, a computer program is provided. When the computer program is run, the method provided by any one of the first aspect and the fourth aspect and any one of the implementation manners is executed. BRIEF DESCRIPTION OF DRAWINGS

[0055] FIG. 1 is a schematic diagram of a communication system 100 applicable to the present application.

[0056] FIG. 2 is a schematic diagram of subcarriers and OFDM time widths corresponding to the subcarriers.

[0057] FIG. 3 is a schematic diagram of an NR initial access process.

[0058] FIG. 4 is a schematic diagram of a base station transmitting a synchronization signal and a UE detecting the synchronization signal.

[0059] FIG. 5 is a schematic diagram of a structure of one synchronization signal block (SSB).

[0060] FIG. 6 is a schematic diagram of a frame structure of an SSB.

[0061] FIG. 7 is a schematic diagram of resource mapping relationships of various signals in an SS / PBCH block.

[0062] FIG. 8 is a schematic flowchart of a communication method 200 provided by an embodiment of the present application.

[0063] FIG. 9 is a schematic diagram of PBCH block mapping to meet access of terminals of different specifications.

[0064] FIG. 10 is a schematic diagram of multiple sub-PBCHs traversing a first frequency domain unit of synchronization resource blocks in N periods.

[0065] FIG. 11 is a schematic diagram of two ways of enabling terminals of different specifications to access.

[0066] FIG. 12 is a schematic block diagram of a communication apparatus 1000 according to an embodiment of the present application.

[0067] FIG. 13 is a schematic block diagram of a communication apparatus 2000 according to an embodiment of the present application.

[0068] FIG. 14 is a schematic block diagram of a chip system 3000 according to an embodiment of the present application. DETAILED DESCRIPTION

[0069] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0070] First, in the present application, "for indicating" can include direct indication and indirect indication. When describing that certain indication information is for indicating A, it can include that the indication information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the indication information.

[0071] The information indicated by the indication information is referred to as to-be-indicated information, and there are many ways to indicate the to-be-indicated information in the specific implementation process, for example but not limited to, the to-be-indicated information can be directly indicated, such as the to-be-indicated information itself or an index of the to-be-indicated information. The to-be-indicated information can also be indirectly indicated by indicating other information, where the other information and the to-be-indicated information have an association relationship. The to-be-indicated information can also be only indicated in part, and the other part of the to-be-indicated information is known or agreed in advance. For example, the indication of a specific information can also be achieved by means of the arrangement order of each information agreed in advance (for example, specified by a protocol), thereby reducing the indication overhead to a certain extent. At the same time, the common part of each information can be identified and uniformly indicated, so as to reduce the indication overhead caused by separately indicating the same information.

[0072] Second, in the present application, "at least one" means one or more, and "multiple" means two or more (including two). In addition, in the embodiments of the present application, "first", "second", and various numerical numbers (for example, "#1", "#2", etc.) are only for the convenience of description and do not limit the scope of the embodiments of the present application. The size of the serial number of each process below does not mean the execution order, and the execution order of each process should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application. It should be understood that the objects thus described can be interchanged under appropriate circumstances, so as to be able to describe schemes other than the embodiments of the present application. In addition, in the embodiments of the present application, the words such as "S210" are only for the convenience of description and do not limit the order of execution steps.

[0073] Third, in the embodiments of the present application, the words such as "exemplarily" or "for example" are used to represent an example, illustration or description. Any embodiment or design scheme described as "exemplarily" or "for example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. In fact, the words such as "exemplarily" or "for example" are intended to present the relevant concept in a specific manner.

[0074] Fourth, in the embodiments of the present application, "storage" can refer to storage in one or more memories. The one or more memories can be separately arranged or integrated in the encoder or decoder, the processor, or the communication apparatus. The one or more memories can be partially separately arranged and partially integrated in the decoder, the processor, or the communication apparatus. The type of the memory can be any form of storage medium, which is not limited in the present application.

[0075] Fifth, in the embodiments of the present application, "protocol" can refer to a standard protocol in the communication field, for example, can include the NR protocol and the related protocol applied to the future communication system, which is not limited in the present application.

[0076] Sixth, in the embodiments of the present application, "of", "corresponding", "corresponding" and "associate" can be used interchangeably at times. It should be pointed out that the meanings expressed are consistent when the distinction is not emphasized.

[0077] Seventh, in the embodiments of the present application, "in the case of", "when", "if" can be used interchangeably at times. It should be pointed out that the meanings expressed are consistent when the distinction is not emphasized.

[0078] Eighth, the term "and / or" in the present document is only used to describe the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in the present document generally represents an "or" relationship between the associated objects.

[0079] Ninth, the terms "message" and "information" can be used interchangeably in the present document, and the names of the message or information are not limited in any way as long as the corresponding functions can be implemented.

[0080] In the present application, “sending” and “receiving” represent the direction of signal transmission. For example, “sending information to XX” can be understood as the destination of the information being XX, and “sending information” can include direct sending or indirect sending through other units or modules. “Receiving information from YY” can be understood as the source of the information being YY, and “receiving information” can include direct reception from YY or indirect reception from YY through other units or modules. In addition to air interface sending or air interface receiving signals implemented at the whole machine level of network devices or terminal devices, “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. For example, a modem or a system-level chip (such as a system on a chip (SoC) chip or a system in package (SIP) chip, etc.) sends or receives signals. “Sending” or “receiving” can also be performed by device components, such as sending or receiving signals through several parts, modules, chips of a device using buses, wires or interfaces.

[0081] The technical solutions in the present application will be described below with reference to the accompanying drawings.

[0082] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example: long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile communication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, 5th generation (5G) system or new radio (NR), and future communication systems, vehicle-to-X (V2X), which can include vehicle to network (V2N), vehicle to vehicle (V2V), vehicle to infrastructure (V2I), vehicle to pedestrian (V2P), etc., LTE-V (long term evolution-vehicle), Internet of vehicles, machine type communication (MTC), Internet of things (IoT), LTE-M (long term evolution-machine), machine to machine (M2M), wireless local area network (WLAN), etc.

[0083] A device in a communication system can send a signal to another device or receive a signal from another device. Wherein the signal can include information, signaling or data, etc. Wherein, the device can also be replaced by an entity, network entity, communication device, communication module, node, communication node, etc. The device is described in the present application. For example, the communication system can include at least one terminal device and at least one network device. The network device can send a downlink signal to the terminal device, and / or the terminal device can send an uplink signal to the network device.

[0084] FIG. 1 is a schematic diagram of a communication system 100 applicable to the present application. As shown in FIG. 1, the communication system 100 includes a radio access network 100. The radio access network 100 can be a next generation (e.g., a future communication network or a higher version) radio access network, or a legacy (e.g., 5G, 4G, 3G or 2G) radio access network. One or more terminal devices (120a-120j, collectively referred to as 120) can be connected to each other or to one or more network devices (110a, 110b, collectively referred to as 110) in the radio access network 100.

[0085] In the communication system, the network device can transmit downlink data to the terminal device, and the terminal device can also transmit uplink data to the network device. It should be understood that the embodiments of the present application can be applicable to a communication system having an uplink communication link and a downlink communication link, and can be applicable not only to uplink signal transmission but also to downlink signal transmission. For downlink signal transmission, the transmitting device is the network device, and the corresponding receiving device is the terminal device. For uplink signal transmission, the transmitting device is the terminal device, and the corresponding receiving device is the network device. The embodiments of the present application do not limit the transmission direction of the signal.

[0086] In practical applications, the wireless communication system can include multiple network devices at the same time, or multiple terminal devices at the same time, without limitation. One network device can serve one or more terminal devices at the same time. One terminal device can also access one or more network devices at the same time. The embodiments of the present application do not limit the number of terminal devices and network devices included in the wireless communication system.

[0087] The terminal device is a user-side device with wireless transceiving function, which can be a fixed device, a mobile device, a handheld device (e.g., a mobile phone), a wearable device, a vehicle-mounted device, or a wireless device (e.g., a communication module, a modem, or a chip system) built in the above devices. The terminal device is used to connect people, things, machines, etc., and can be widely used in various scenarios, such as cellular communication, D2D communication, V2X communication, peer to peer (P2P) communication, machine-to-machine / machine-type communications (M2M / MTC) communication, Internet of Things, virtual reality (VR), augmented reality (AR), industrial control, self driving, remote medical, smart grid, smart furniture, smart office, smart wear, smart transportation, smart city, unmanned aerial vehicle, robot, remote sensing, passive sensing, positioning, navigation and tracking, autonomous delivery, etc. Exemplarily, the terminal device can be a handheld terminal in cellular communication, a communication device in D2D, an Internet of Things device in MTC, a monitoring camera in smart transportation and smart city, or a communication device on an unmanned aerial vehicle, etc. The terminal device can be referred to as user equipment (UE), user terminal, user apparatus, subscriber unit, subscriber station, terminal, access terminal, access station, UE station, remote station, mobile device, or wireless communication device, etc. The terminal device can also be a terminal device in an IoT system. IoT is an important part of future information technology development, and its main technical feature is to connect things through communication technology and network, so as to realize the intelligent network of man-machine interconnection and thing-thing interconnection. In the embodiments of the present application, IoT technology can achieve massive connection, deep coverage, and terminal power saving through, for example, narrow band (NB) technology. In the embodiments of the present application, the device for realizing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system or a combination device or component that can realize the function of the terminal device, which can be installed in the terminal device. The terminal device is usually provided with a communication module, circuit or chip (such as a modem chip, also known as a baseband chip, or a system on chip (SoC) chip or a system in package (SIP) chip containing a modem core) for performing corresponding communication functions. The terminal device is also configured with program instructions for performing corresponding communication functions.For the convenience of description, a terminal device is described below by taking a terminal or a UE as an example.

[0088] It should be understood that in certain scenarios, a UE can also be used to act as a base station. For example, a UE can act as a scheduling entity that provides sidelink signals between UEs in V2X, D2D, or P2P scenarios, etc.

[0089] In embodiments of the present application, the apparatus for implementing the functions of the terminal device can be a terminal device, or an apparatus capable of supporting the terminal device to implement the functions, such as a chip system or a chip, which can be installed in the terminal device. In embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0090] A network device is a network-side device with wireless transceiving function. The network device can be an apparatus in a radio access network (RAN) that provides wireless communication function for terminal devices. The network device can be a 3rd generation partnership project (3GPP)-related cellular system, such as a 5G mobile communication system or a future mobile communication system. The network device can also be an open radio access network (O-RAN or ORAN), a cloud radio access network (CRAN), or a wireless fidelity (WiFi) system. For example, the network device can be a base station, an evolved NodeB (eNodeB), a next generation NodeB (gNB) in a 5G mobile communication system, a base station in a subsequent evolution of 3GPP, a transmission reception point (TRP), an access node in a WiFi system, a wireless relay node, a wireless backhaul node, or the like. In a communication system employing different radio access technologies (RATs), the name of the device with base station function can be different. For example, in an LTE system, it can be referred to as an eNB or eNodeB, and in a 5G system or NR system, it can be referred to as a gNB. The specific name of the base station is not limited in the present application. The base station can be fixed or mobile. For example, a helicopter or unmanned aerial vehicle can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, a helicopter or unmanned aerial vehicle can be configured to act as a device that communicates with another base station. The network device can include one or more co-sited or non-co-sited transmission reception points. For another example, the network device can include at least one of the following: one or more central units (CUs), one or more distributed units (DUs), and one or more radio units (RUs).

[0091] In different systems, the CU (or CU-CP and CU-UP), DU or RU can also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, the CU can also be referred to as O-CU (open CU), the DU can also be referred to as O-DU (open DU), the CU-CP can also be referred to as O-CU-CP, the CU-UP can also be referred to as O-CU-UP, and the RU can also be referred to as O-RU. Any of the CU (or CU-CP, CU-UP), DU and RU in this application can be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. Exemplarily, the functions of the CU can be implemented by one entity or different entities. For example, the functions of the CU are further divided, i.e., the control plane and the user plane are separated and implemented by different entities, which are the control plane CU entity (i.e., the CU-CP entity) and the user plane CU entity (i.e., the CU-UP entity), respectively. The CU-CP entity and the CU-UP entity can be coupled with the DU to jointly complete the functions of the access network device. For example, the CU is responsible for processing non-real-time protocols and services, implementing the functions of the radio resource control (RRC) and the packet data convergence protocol (PDCP) layer. The DU is responsible for processing the physical layer protocol and real-time services, implementing the functions of the radio link control (RLC) layer, the medium access control (MAC) layer and the physical (PHY) layer. In this way, part of the functions of the wireless access network device can be implemented by multiple network function entities. These network function entities can be network elements in a hardware device, or software functions running on a dedicated hardware, or virtualized functions instantiated on a platform (e.g., a cloud platform). The network device can also include an active antenna unit (AAU). The AAU implements part of the physical layer processing functions, radio frequency processing and related functions of the active antenna. Since the information of the RRC layer will eventually become the information of the PHY layer, or be converted from the information of the PHY layer, in this architecture, high-layer signaling, such as RRC layer signaling, can also be considered as being sent by the DU, or by the DU+AAU. It can be understood that the network device can be a device including one or more of the CU node, the DU node and the AAU node. In addition, the CU can be divided into a network device in the RAN, or the CU can be divided into a network device in the core network (CN), which is not limited in this application.For example, in vehicle to everything (V2X) technology, the access network device can be a road side unit (RSU). A plurality of access network devices in a communication system can be base stations of the same type or base stations of different types. A base station can communicate with a terminal device or communicate with a terminal device through a relay station.

[0092] In embodiments of the present application, the device for implementing the function of the network device can be the network device itself, or a device capable of supporting the network device to implement the function, such as a chip system or a combined device or component that can implement the function of the access network device, which can be installed in the network device. In embodiments of the present application, the chip system can be composed of a chip, or can include a chip and other discrete devices.

[0093] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water; and can also be deployed on aircraft, balloons and satellites in the air. The present application does not limit the scenario in which the network device and the terminal device are located. In addition, the terminal device and the network device can be hardware devices, or software functions running on special-purpose hardware, software functions running on general-purpose hardware, such as virtualized functions instantiated on a platform (e.g., a cloud platform), or entities including special-purpose or general-purpose hardware devices and software functions. The present application does not limit the specific form of the terminal device and the network device.

[0094] To facilitate understanding of embodiments of the present application, first, the basic concepts involved in the present application are explained.

[0095] 1. Orthogonal frequency division multiplexing (OFDM): a frequency division multiplexing multicarrier transmission waveform, the signals (also called carriers / subcarriers) involved in multiplexing are orthogonal. OFDM technology converts a high-speed data stream into multiple parallel low-speed data streams through serial / parallel conversion, and then transmits them on subcarriers of different frequencies. OFDM technology uses orthogonal subcarriers, so the frequency spectrum of the subcarriers is overlapped. In the traditional FDM multicarrier modulation system, a guard interval is required between subcarriers. Compared with this, OFDM technology greatly improves the spectrum utilization.

[0096] 2. Modulation: The process of processing the information of the signal source to add to the carrier, so that it becomes the form suitable for channel transmission. Different modes correspond to different modulation methods, such as multi-carrier modulation or single-carrier modulation, quadrature amplitude modulation (QAM), pulse amplitude modulation (PAM), phase shift keying (PSK) modulation, amplitude shift keying (ASK) modulation, etc.

[0097] 3. Demodulation: The inverse process of modulation, to recover the original data bits or symbols from the signal. Demodulation can also be called detection.

[0098] 4. Reference signal (RS): Refers to the time and frequency position of the signal known or inferred according to the predetermined rules by the sending end or receiving end, and the signal / symbol carried in time and frequency. According to the function, the reference signal can include demodulation reference signal (DMRS), channel state information reference signal (CSI-RS), phase tracking reference signal (PTRS), sounding reference signal (SRS), etc. The reference signal is used to obtain the known signal affected by the outside world (for example, the space channel, the non-ideal device of the sending or receiving end) in the transmission of the signal, and is generally used for channel estimation, auxiliary signal demodulation, detection. For example, DMRS and CSI-RS are used to obtain channel information, and PTRS is used to obtain phase change information.

[0099] 5、Subcarrier: In a multi-carrier waveform, the transmitted signal is a bandwidth signal, and there are many signals of different frequencies in the bandwidth signal, which are called subcarriers. The intervals of these frequencies are the same. The data of the base station and the terminal device are modulated on these subcarriers, and these subcarriers are orthogonal in a period of time. Taking the subcarrier spacing (SCS) of 15 kHz, 30 kHz and 60 kHz supported by the current cellular system as an example, each frequency domain space is a subcarrier and can be used to transmit data. In the initial version of 5G, the supported subcarrier spacing is shown in Table 1, where μ is the index (or configuration parameter, configured by layer three signaling subcarrierSpacing) corresponding to the subcarrier spacing, Normal represents normal cyclic prefix (NCP), and Extended represents extended cyclic prefix (ECP). In the future, there may be more subcarrier spacing candidate values, for example, μ = 5, 6, 7, 8, 9 corresponding to subcarrier spacing values of Δf = 480, 960, 1920, 3840, 7680, respectively, in kHz. Figure 2 is a schematic diagram of subcarriers and OFDM time widths corresponding to the subcarriers. As shown in Figure 2, different subcarriers correspond to different OFDM symbol time lengths.

[0100] Table 1

[0101] 6、Resource block (RB): also known as physical resource block (PRB). It is the basic unit of frequency resource in an OFDM communication system. A resource block generally consists of N resource elements (REs), and a resource element is also called a subcarrier. N is generally 12. A plurality of resource blocks form a resource block group (RBG), or also known as a physical resource block group. In general, precoding is performed in units of resource blocks or resource block groups, and the basic unit of precoding and transmission is also called a precoding resource block group (PRG). A precoding resource group can be no less than a resource block group.

[0102] 7、NR initial access process: Figure 3 is a schematic diagram of the NR initial access process, which shows the information transmission process of 5G NR, mainly including the following steps:

[0103] P100: The base station sends a synchronization signal to the UE at a specific location. The UE then receives the synchronization signal from the base station.

[0104] In NR, the synchronization signal transmitted by the base station is called the synchronization signal / physical broadcast channel block (SS / PBCH block), which can be abbreviated as SSB. The SSB is transmitted periodically by the base station. The content carried by the PBCH is called the master information block (MIB). The MIB may contain key information such as the search space (i.e., searchSpaceZero) and control resource set (i.e., controlResourceSetZero) of system information block type 1 (SIB1). An SSB that indicates SIB1 is called a cell-defining SSB (CD SSB), and its terminology in the protocol is "CORESET for Type 0-PDCCH CSS is present". Here, CORESET is the control-resource set, PDCCH is the physical downlink control channel, and CSS is the common search space. An SSB that does not indicate SIB1 is called a non-cell-defining SSB (NCD SSB), and its terminology in the protocol is "CORESET for Type 0-PDCCH CSS set is not present".

[0105] After the UE powers on or needs to reconnect to the network, it scans the base station's synchronization signal and performs downlink time and frequency synchronization; this process is called cell search. After determining the receiving SSB, it further receives configuration information about random access resources from the system information.

[0106] P101. Base stations can broadcast system information from specific locations. The signal carrying the system information is called a system information block (SIB). In particular, system information block 1 (SIB1) carries random access configuration information, PDCCH search space (SearchSpace 1) information such as message 2 / message 4, etc., which can be used by the UE to complete the random access process and finally establish a link with the base station and access the base station.

[0107] P102. Based on the random access configuration information and the synchronized SSB, the UE selects the random access resource associated with the SSB. This resource includes time-domain resources, frequency-domain resources, and code-domain resources. The code-domain resource includes a random access preamble, which the UE uses to send a random access signal, also known as message 1 (Msg1). In NR, the association between the SSB and the random access resource allows the base station to obtain the downlink beam required to send message 2 and / or subsequent messages (such as Msg3 and Msg4) after detecting the random access preamble. Accordingly, the base station attempts to receive the random access preamble. Upon successful reception, it sends message 2, which is a random access response message. Message 2 may schedule uplink transmission, the information of which is message 3 (Msg3). Finally, message 4 may also be included to resolve access conflicts.

[0108] 8. Synchronization Signal in NR: In LTE, base stations broadcast a common reference signal (CRS) for UEs to perform downlink synchronization and cell quality measurements. In 5G NR, due to the evolution of cellular communication to higher frequencies, all downlink signals in the system are transmitted in beamform. This beamform signal that provides downlink synchronization is called a synchronization signal. The base station transmits synchronization signals in all directions sequentially, completing the transmission of synchronization signals in all directions within a certain period of time (within 5ms in the current protocol).

[0109] Figure 4 illustrates the process of a base station transmitting synchronization signals and a UE detecting them. As shown in Figure 4, the base station transmits a set of signals every 20ms. This set includes multiple synchronization signals, which ensure coverage of the base station's range. For example, if the base station covers a circular area, it needs to transmit synchronization signals every 20ms to scan 360°. It should be noted that the 20ms transmission period in Figure 4 is only an example; the period can also be greater than 20ms. In Figure 4, within a 5ms interval, the base station transmits eight synchronization signal blocks, as shown in Figure 4, which are mapped to signal blocks 0-7 in each beam. The base station transmits these blocks in different directions. UEs at different locations may be able to detect one or more synchronization signal blocks.

[0110] Figure 5 is a schematic diagram of the structure of a synchronization signal block (SSB). As shown in Figure 5, a synchronization signal block is composed of a primary synchronization signal (PSS), a secondary synchronization signal (SSS), and a PBCH. It occupies 4 OFDM symbols in the time domain, with the PSS being transmitted on the 0th symbol, the PBCH being transmitted on the 1st and 3rd symbols, and the SSS signal and part of the PBCH content being transmitted on the 2nd symbol. It occupies 240 subcarriers, or 240 REs, in the frequency domain.

[0111] Figure 6 is a schematic diagram of the frame structure of an SSB. As shown in Figure 6, the maximum total number of SS / PBCH blocks that a base station can transmit within 5 ms is 4 / 8 / 64, which is related to the operating frequency band of the base station. A 5G base station operating above 6 GHz can transmit a maximum of 64 SS / PBCH blocks, and in practice it can also not transmit all 64. When operating above 6 GHz, according to the current protocol, the subcarrier spacing (SCS) can only be 120 kHz or 240 kHz. In addition, the transmission mode of an NR SSB varies depending on the subcarrier spacing, frequency range, and other parameters. Currently, the protocol specifies five time-domain patterns for the time-domain distribution of SSBs within an SSB burst set: Case A, Case B, Case C, Case D, and Case E, of which Cases A-C specify patterns for the FR1 frequency band range, and Cases D and E specify patterns for the FR2 frequency band range.

[0112] In the current version of the protocol, the standard gives the resource mapping relationship of the SSB, i.e., the transmission location of the SSB in the time domain and the frequency domain, using a formula, as shown in Table 2.

[0113] Table 2

[0114] The second column in Table 2 is the time domain symbol position of each signal, and the third column is the frequency domain subcarrier position. As can be seen from the above, the PSS occupies the 0th symbol in the time domain and specifically occupies subcarriers 56-182 in the frequency domain; the SSS occupies the 2nd symbol in the time domain and specifically occupies subcarriers 56-182 in the frequency domain; the PBCH occupies the 1st and 3rd symbols in the time domain and occupies the entire 240 subcarriers in the frequency domain, in addition, the PBCH also occupies the 2nd symbol in the time domain and occupies the two ends, i.e., subcarriers 0-47 and 192-239, in the frequency domain. In the table, v represents the first RE position offset occupied by the PBCH DMRS in one RB, which can take 0, 1, 2, and 3, a total of 4 values, and the specific calculation method is: v = N cell id mod 4, which can reduce the PBCH DMRS signal co-frequency interference between different cells to a certain extent.

[0115] FIG. 7 is a schematic diagram of the resource mapping relationship of each signal in the SS / PBCH block. As can also be seen from FIG. 7, the existing SSB structure occupies 4 symbols continuously in the time domain and occupies 20 RBs in the frequency domain, and one RB is equal to 12 REs, i.e., 240 subcarriers. Among them, the PSS and the SSS occupy 127 subcarriers in the 0th symbol and 127 subcarriers in the 2nd symbol in the SSB, respectively; the PBCH occupies the 1st and 3rd symbols in the entire SSB, and in addition, also occupies 48 subcarriers at both ends in the 2nd symbol, a total of 576 subcarriers, or in other words, a total of 576 REs, which include the DMRS for the PBCH.

[0116] Table 3 shows information of three terminals supporting different bandwidths, in which megahertz (MHz) is abbreviated as “M”.

[0117] Table 3

[0118] As can be seen from the above, in the current SSB, the PBCH occupying the 1st symbol and the 3rd symbol occupies 20 RBs in the frequency domain, and the commonly used subcarrier spacing in the current 5G is 30 kHz. When the subcarrier spacing is 30 kHz, one RB is equal to 12 REs, so the bandwidth of a single RB = 12 x subcarrier spacing = 12 x 30 kHz = 360 kHz; and the PBCH in the SSB occupies 20 RBs, so the total bandwidth = 20 x bandwidth of a single RB = 7.2 MHz, which can be written as 20 RBs @ 30 kHz -> 7.2 MHz. That is, the bandwidth corresponding to the current SSB structure is greater than or equal to 7.2 MHz, but since the bandwidth supported by the small-bandwidth terminal device is smaller than the bandwidth corresponding to the SSB, the small-bandwidth terminal device cannot obtain the complete PBCH carried in a SSB. For example, for a 5M terminal device, since 5 MHz is smaller than 7.2 MHz, the complete PBCH corresponding to the 1st symbol and the 3rd symbol in the current SSB cannot be obtained. In addition, when the bandwidth range supported by the 5M terminal device can only cover subcarriers 56-182, the terminal cannot obtain the PBCH corresponding to the 2nd symbol either. Therefore, the small-bandwidth terminal device cannot access the network device according to the current SSB.

[0119] Therefore, how to enable the small-bandwidth terminal device to access the network device needs to be solved urgently.

[0120] Based on the above problems, the present application provides a communication method, which can enable the small-bandwidth terminal device to access the network device.

[0121] FIG. 8 is a schematic flowchart of a communication method 200 provided by an embodiment of the present application, including the following steps:

[0122] S210, the network device sends a synchronization resource block to the terminal device in N periods, respectively, the physical broadcast channel carried on the synchronization resource block is divided into a plurality of physical broadcast sub-channels, and the physical broadcast sub-channels carried on the first frequency domain unit of the synchronization resource blocks in the N periods are different, the bandwidth of the first frequency domain unit is smaller than the bandwidth corresponding to the synchronization resource block, and the first frequency domain unit is located within the bandwidth range supported by the terminal device, and N is an integer greater than 1. Correspondingly, the terminal device receives the synchronization resource block from the network device in N periods, respectively.

[0123] In one manner, the network device respectively sends a synchronization resource block to the terminal device in N cycles, each synchronization resource block including a plurality of physical broadcast channels for the terminal device to access the network device, the physical broadcast channels carried on a first frequency domain unit of the N cycles of synchronization resource blocks being different, the bandwidth of the first frequency domain unit being less than the bandwidth corresponding to the synchronization resource block, and the first frequency domain unit being within a bandwidth range supported by the terminal device, N being an integer greater than 1. Accordingly, the terminal device respectively receives the synchronization resource block from the network device in N cycles.

[0124] The physical broadcast subchannels / physical broadcast channels carried on the first frequency domain unit of the N cycles of synchronization resource blocks are different specifically refers to the information carried by the physical broadcast subchannels / physical broadcast channels carried on the first frequency domain unit of the N cycles of synchronization resource blocks being different.

[0125] The following is described by taking the synchronization resource block as an SSB and N = 2 as an example.

[0126] Exemplarily, the synchronization resource block is an SSB. The frequency domain unit for carrying the physical broadcast channel PBCH in one SSB is divided into two parts, the one SSB including two frequency domain resources for carrying the PBCH, each frequency domain resource being used to carry a part of the PBCH. Table 4 shows the time domain symbol positions and frequency domain subcarrier positions of PBCH#0 and PBCH#1 in the manner of dividing the frequency domain unit occupied by the PBCH in one SSB into two parts to obtain two frequency domain resources, one frequency domain resource being used to carry PBCH#0 and the other frequency domain resource being used to carry PBCH#1.

[0127] It can be understood that on the first symbol and the third symbol in one SSB, the PBCH is carried on all the frequency domain units of the one SSB, and on the second symbol, the PBCH is carried on part of the frequency domain units of the one SSB, and the terminal device needs to access the network device through all the PBCHs carried in the SSB. For the convenience of description, the complete PBCH carried in one SSB is referred to as a "first PBCH". The first PBCH in the following description is all the PBCHs carried on the first to third symbols in one SSB, and all the PBCHs carried on the SSB are divided as a whole, i.e., the first PBCH is divided.

[0128] Exemplarily, the PBCH#0 and the PBCH#1 in Table 4 can be 2 sub-PBCHs divided from the first PBCH, and the 2 sub-PBCHs can be included in one SSB, where the PBCH#0 and the PBCH#1 are included in the 1st symbol and the 3rd symbol, and the PBCH#1 is included in the 2nd symbol. The first PBCH is divided into 2 parts, and the 2 parts can be referred to as 2 sub-PBCHs, or can be referred to as 2 PBCHs. Therefore, the PBCH#0 and the PBCH#1 can be an example of a plurality of physical broadcast sub-channels, or can be an example of a plurality of physical broadcast channels. The first PBCH is an example of a divided physical broadcast channel.

[0129] It should be noted that the name of the physical broadcast channel carried on each of the plurality of frequency domain resources obtained by dividing all the physical broadcast channels carried in the synchronization resource block is not limited in the present application, and can be referred to as a physical broadcast sub-channel, or a physical broadcast channel, or other names. The sub-PBCH (such as PBCH#0 or PBCH#1 or PBCH#2) in the present application can be an example of a physical broadcast channel, or an example of a physical broadcast sub-channel.

[0130] For ease of illustration, each part obtained by dividing the first PBCH is referred to as a sub-PBCH in the present application, for example, the PBCH#0 and the PBCH#1 in the above are referred to as 2 sub-PBCHs obtained by dividing the first PBCH, or in other words, the first PBCH is divided into 2 sub-PBCHs, and the 2 sub-PBCHs are the PBCH#0 and the PBCH#1.

[0131] In the frequency domain, a frequency domain resource can include one or more frequency domain units. One frequency domain unit can be one resource element (RE), or one resource block (RB), or one sub-channel, or one resource pool, or one RB set, or one bandwidth, or one bandwidth part (BWP), or one carrier, or one channel, or one interlace RB, etc. Optionally, one carrier can include one or more BWPs. Optionally, one BWP can include one or more resource pools. One BWP can include one or more RB sets. Optionally, one resource pool can include one or more RBs or sub-channels. Optionally, one sub-channel can include one or more RBs. One RB can include one or more REs.

[0132] It can be understood that the RE can be a subcarrier, and the RB and the RE can be converted into each other, for example, 1 RB is equal to 12 REs, which are equal to 12 subcarriers.

[0133] Table 4

[0134] As shown in Table 4, the subcarriers occupied by the first PBCH in the frequency domain are divided into two parts, and two frequency domain resources are obtained, each of which includes one of the two parts of subcarriers. For example, the first PBCH is divided into 2 sub-PBCHs, which are referred to as PBCH#0 and PBCH#1, and each frequency domain resource is used to carry one of the sub-PBCHs of the first PBCH. According to the division mode of Table 4, PBCH#0 occupies subcarriers No. 36-179 in the frequency domain, and PBCH#1 occupies subcarriers No. 0-35 and No. 180-239 in the frequency domain. Exemplarily, a first frequency domain resource is used to carry PBCH#0, and the first frequency domain resource includes subcarriers No. 36-179; a second frequency domain resource is used to carry PBCH#1, and the second frequency domain resource includes subcarriers No. 0-35 and No. 180-239.

[0135] Exemplarily, the subcarriers occupied by the first PBCH in the frequency domain are divided into 3 parts, and 3 frequency domain resources are obtained, each of which includes one of the 3 parts of subcarriers. For example, the first PBCH is divided into 3 sub-PBCHs, which are referred to as PBCH#0, PBCH#1 and PBCH#2, and each frequency domain resource is used to carry one of the sub-PBCHs of the first PBCH. Exemplarily, a first frequency domain resource is used to carry PBCH#0, and the first frequency domain resource includes subcarriers No. 36-179; a second frequency domain resource is used to carry PBCH#1, and the second frequency domain resource includes subcarriers No. 0-35; and a third frequency domain resource is used to carry PBCH#2, and the third frequency domain resource includes subcarriers No. 180-239.

[0136] It should be noted that the division can be uniform division, for example, 240 subcarriers in the SSB are uniformly divided into 2 parts, each of which includes 120 subcarriers; or non-uniform division, for example, the 240 subcarriers are non-uniformly divided into 2 parts, one part includes subcarriers No. 36-179, and the other part includes subcarriers No. 0-35 and No. 180-239, which is not limited in the present application.

[0137] In one mode, the frequency domain resource carrying the physical broadcast channel on the synchronization resource block is divided into a center and an edge.

[0138] Exemplarily, the frequency domain resources carrying the first PBCH in the SSB are divided into center and edge, respectively obtaining two frequency domain resources, for example, frequency domain resource #0 and frequency domain resource #1, wherein the frequency domain resource #0 includes subcarriers #56-#182, and the frequency domain resource #1 includes subcarriers #0-#55 and subcarriers #183-#239; the two sub-PBCHs (for example, PBCH #0 and PBCH #1) divided from the first PBCH are respectively carried in the frequency domain resource #0 and the frequency domain resource #1, for example, the frequency domain resource #0 carries the PBCH #0, and the frequency domain resource #1 carries the PBCH #1.

[0139] It should be noted that the present application does not limit the division manner of the subcarriers occupied by the first PBCH in the SSB, which can be irregularly divided as shown in Table 4, or can be divided according to the center and edge, which is not limited in the present application.

[0140] As can be seen from the above, the terminal device needs to completely receive the first PBCH to access the network device. Based on the division of the first PBCH into multiple sub-PBCHs, the following will exemplarily describe the access of the network device by the terminal devices with different capabilities receiving multiple sub-PBCHs.

[0141] FIG. 9 is a schematic diagram of PBCH block mapping to meet access of terminal devices with different specifications. As shown in FIG. 9, two access modes are designed for access of different terminal devices. (a) in FIG. 9 is a frequency domain fast access mode. As described above, the subcarriers occupied by the first PBCH in the SSB are divided into two parts according to the center and edge, exemplarily, the subcarriers in the middle part (for example, subcarriers #56-#182) carry PBCH #0, and the subcarriers at both ends (for example, subcarriers #0-#55 and subcarriers #183-#239) carry PBCH #1.

[0142] For a large bandwidth terminal device, the bandwidth supported by the large bandwidth terminal device is greater than or equal to the bandwidth corresponding to the SSB (for example, the bandwidth corresponding to the SSB when the subcarrier spacing is 30 kHz is 7.2 Mhz), that is, the bandwidth range supported by the large bandwidth terminal device can cover the entire 240 subcarriers corresponding to the SSB. The dashed rectangular frame area in (a) in FIG. 9 is an example of the bandwidth range supported by the large bandwidth terminal device. The large bandwidth terminal device receives all PBCH #0 and PBCH #1 on the SSB received in one SSB scanning period (for example, the first period shown in (a) in FIG. 9), and can access the network device through PBCH #0 and PBCH #1.

[0143] It should be noted that the dashed rectangular box in this application can be regarded as an example of the bandwidth range supported by the terminal device. When the bandwidth supported by the terminal device is less than the bandwidth corresponding to the SSB, the frequency domain unit in the dashed rectangular box can be regarded as an example of the first frequency domain unit. For example, the first frequency domain unit is the 56th to 182nd subcarrier in the dashed rectangular box in (b) in FIG. 9.

[0144] It can be understood that the bandwidth range of the large-bandwidth terminal device can cover the entire frequency domain unit of the SSB, so the large-bandwidth terminal device can receive a complete first PBCH in each of the N periods, that is, the terminal device can receive PBCH#0 and PBCH#1 in each period, and access the network device according to the PBCH#0 and PBCH#1.

[0145] In one way, the network device transmits a plurality of synchronization resource blocks in each of the N periods. The plurality of synchronization resource blocks in the same period correspond to different beam directions, that is, the plurality of synchronization resource blocks are transmitted on different beams, respectively. The plurality of synchronization resource blocks in the same period are the same synchronization resource blocks, so the plurality of synchronization resource blocks in the same period carry the same cell information.

[0146] For example, as shown in FIG. 4, the network device transmits an SSB every 20 ms, that is, 20 ms is a period, and four periods are shown in FIG. 4. In each period, the network device transmits a plurality of SSBs. As shown in FIG. 4, eight SSBs are transmitted in each period, and the eight SSBs are mapped to eight beams, respectively. Therefore, one SSB corresponds to one beam, and the beam directions of the beams are different. In FIG. 4, the eight SSBs correspond to the 0th to 7th beams, respectively. Therefore, the eight SSBs in each period are transmitted on different corresponding beams, respectively, and the eight SSBs carry the same cell information.

[0147] It can be understood that the network device transmits SSBs in each of the plurality of periods. As described above, the plurality of SSBs transmitted on different beams in each period carry the same cell information. The terminal device can receive one SSB from the plurality of SSBs transmitted by the network device in each period. For a large-bandwidth terminal device, a complete PBCH (that is, a first PBCH) can be received from the one SSB, so that the terminal device can access the network device. However, the bandwidth supported by a small-bandwidth terminal device is less than the bandwidth corresponding to the SSB, so the small-bandwidth terminal device cannot receive a complete PBCH, and thus cannot access the network device.

[0148] In order to support the small-bandwidth terminal device to access the network device, the following methods can be used to enable the small-bandwidth terminal device to receive the first PBCH.

[0149] (b) of FIG. 9 is a time-domain narrow-band access mode, which is applicable to a small-bandwidth terminal device. As known from above, the subcarriers occupied by the first PBCH in the SSB can be divided into two parts according to the center and the edge, for example, the subcarriers in the middle part (for example, subcarriers No. 56-182) carry PBCH#0, and the subcarriers at the two ends (for example, subcarriers No. 0-56 and No. 183-239) carry PBCH#1.

[0150] For a small-bandwidth terminal device, the bandwidth supported by the small-bandwidth terminal device is smaller than the bandwidth corresponding to the SSB shown in (b) of FIG. 9, that is, the bandwidth range supported by the small-bandwidth terminal device cannot cover the entire 240 subcarriers corresponding to the SSB. The subcarriers No. 56-182 in the dashed rectangular frame in (b) of FIG. 9 are an example of a first frequency domain unit. The first frequency domain unit is located within the bandwidth range supported by the small-bandwidth terminal device, and the bandwidth of the first frequency domain unit is smaller than the bandwidth corresponding to the SSB, so the small-bandwidth terminal device can receive the PBCH carried by the first frequency domain unit in one SSB scanning period (for example, the first period shown in (b) of FIG. 9). For example, as shown in (b) of FIG. 9, the first frequency domain unit is subcarriers No. 56-182, in the first period, the small-bandwidth terminal device receives a first SSB, and PBCH#0 is carried on the first frequency domain unit of the first SSB, so the small-bandwidth terminal device can receive PBCH#0 in the first period; in the second period, PBCH#1 at the two ends is cyclically shifted or the resource mapping position is changed to the first frequency domain unit, for example, PBCH#1 moves to subcarriers No. 63-175, the small-bandwidth terminal device receives a second SSB, and PBCH#1 is carried on the first frequency domain unit of the second SSB, so the small-bandwidth terminal device can receive PBCH#1 in the second period. As can be seen, the small-bandwidth terminal device can receive all PBCH#0 and PBCH#1 divided by the first PBCH through two periods, and can access the network device through PBCH#0 and PBCH#1.

[0151] In one mode, the physical broadcast subchannel information carried on the first frequency domain unit of the synchronization resource block in different periods is different.

[0152] Exemplarily, in (b) of FIG. 9, PBCH#0 is carried on the first frequency domain unit of the first SSB received in the first period, and PBCH#1 is carried on the first frequency domain unit of the second SSB received in the second period.

[0153] In one mode, the center frequency point of the first frequency domain unit corresponds to the center frequency point of the synchronization resource block.

[0154] Exemplarily, as shown in (b) of FIG. 9, and the first frequency domain unit is 56th-182nd subcarriers in the dashed rectangular frame, the small-bandwidth terminal device can receive the physical broadcast subchannel on the 56th-182nd subcarriers in each period, and the 56th-182nd subcarriers are located in the middle of the 240 subcarriers of the SSB, that is, the center frequency point of the first frequency domain unit corresponds to the center frequency point of the SSB.

[0155] In one mode, the first frequency domain unit is located at the bandwidth edge of the synchronization resource block in the frequency domain.

[0156] Exemplarily, the first PBCH is divided into 2 PBCHs as shown in Table 4, and the first frequency domain unit can be 0th-35th subcarriers or 180th-239th subcarriers, that is, the first frequency domain unit is located at the bandwidth edge of the SSB in the frequency domain.

[0157] It should be noted that the above introduces two cases of the position of the first frequency domain unit in the SSB, and the above two positions of the first frequency domain unit in the SSB are only examples, and the first frequency domain unit can also be located at other positions in the SSB in the frequency domain, for example, the first frequency domain unit is 36th-182nd subcarriers in the SSB, etc. The position of the first frequency domain unit in the synchronization resource block is not limited in the present application.

[0158] In order to support the small-bandwidth terminal device to receive the complete first PBCH, it is necessary to make the divided multiple sub-PBCHs received by the small-bandwidth terminal device, and from the above, it can be known that the present application is to receive multiple sub-PBCHs through N periods respectively, and the first frequency domain unit in the SSB corresponding to different periods carries different sub-PBCHs, and the following describes how to make the first frequency domain unit of the SSB of different periods carry different sub-PBCHs.

[0159] In one mode, the multiple physical broadcast subchannels are traversed on the first frequency domain unit of the synchronization resource block of N periods through cyclic shift in the frequency domain or resource mapping position change in the frequency domain.

[0160] In one mode, the multiple physical broadcast subchannels are traversed on the first frequency domain unit of the synchronization resource block of N periods through cyclic shift in the frequency domain or resource mapping position change in the frequency domain.

[0161] Exemplarily, as shown in (b) of FIG. 9, when the first PBCH is divided into 2 sub-PBCHs, the 56th-182nd sub-carriers in the dashed rectangular frame in the figure are an example of the first frequency domain unit, and the 0th-55th and 183rd-239th sub-carriers are an example of the second frequency domain unit. In the first period, PBCH#0 is carried on the first frequency domain unit, and PBCH#1 is carried on the second frequency domain unit, and the small-bandwidth terminal device can receive PBCH#0. In the second period, PBCH#1 on the second frequency domain unit of the SSB in the first period is moved to the first frequency domain unit by cyclic shift in the frequency domain or resource mapping position change in the frequency domain, and PBCH#1 is carried on the first frequency domain unit of the SSB in the second period, and the small-bandwidth terminal device can receive PBCH#1. Therefore, PBCH#0 and PBCH#1 realize one traversal on the first frequency domain unit of the SSBs in the two periods, and the number of periods of traversal completion is 2. It can be seen that the sub-PBCHs carried on the first frequency domain unit of the SSBs in the two periods are different.

[0162] It can be understood that in each period, the SSB received by the small-bandwidth terminal device includes PBCH#0 and PBCH#1, but due to the limited capability of the small-bandwidth terminal device, only the PBCH (such as PBCH#0 or PBCH#1) carried on the first frequency domain unit can be received. Therefore, PBCH#0 or PBCH#1 needs to complete traversal on the first frequency domain unit by cyclic shift in the frequency domain or resource mapping position change in the frequency domain, and it needs 2 periods to complete one traversal, so that the small-bandwidth terminal device receives PBCH#0 and PBCH#1 on the first frequency domain unit of the SSBs in 2 periods.

[0163] Next, an example of the traversal manner of 3 sub-PBCHs (such as PBCH#0, PBCH#1, and PBCH#2) on the first frequency domain unit of the SSBs in 3 periods when the first PBCH is divided into 3 sub-PBCHs is exemplarily described in combination with FIG. 10.

[0164] For ease of illustration, FIG. 10 shows that the sub-carriers occupied by the first PBCH are uniformly divided into 3 parts, each part carrying one sub-PBCH, wherein PBCH#1 is located on the 0th-79th sub-carriers, PBCH#0 is located on the 80th-159th sub-carriers, and PBCH#2 is located on the 160th-239th sub-carriers.

[0165] FIG. 10 is a schematic diagram of the traversal of multiple physical broadcast sub-channels on the first frequency domain unit of the synchronization resource blocks in N periods. As shown in (a) of FIG. 10, the SSB in each period includes PBCH#0, PBCH#1, and PBCH#2.

[0166] As an example, the dashed rectangular frame area in (a) in FIG. 10 is the bandwidth range supported by the terminal device, the first frequency domain unit is the 80th-159th subcarrier, the second frequency domain unit is the 0th-79th subcarrier, and the third frequency domain unit is the 160th-239th subcarrier. In the first period, PBCH#0 is carried on the first frequency domain unit, PBCH#1 is carried on the second frequency domain unit, and PBCH#2 is carried on the third frequency domain unit. In the second period, PBCH#0, PBCH#1, and PBCH#2 in the SSB of the first period are cyclically shifted in the frequency domain, that is, PBCH#2 carried on the third frequency domain unit of the SSB of the first period is moved to the second frequency domain unit, PBCH#1 carried on the second frequency domain unit of the SSB of the first period is moved to the first frequency domain unit, and PBCH#0 carried on the first frequency domain unit of the SSB of the first period is moved to the third frequency domain unit, so that PBCH#1 is carried on the first frequency domain unit of the SSB of the second period. Similarly, in the third period, PBCH#0, PBCH#1, and PBCH#2 in the SSB of the second period are cyclically shifted in the frequency domain, that is, PBCH#0 carried on the third frequency domain unit of the SSB of the second period is moved to the second frequency domain unit, PBCH#2 carried on the second frequency domain unit of the SSB of the second period is moved to the first frequency domain unit, and PBCH#1 carried on the first frequency domain unit of the SSB of the second period is moved to the third frequency domain unit, so that PBCH#2 is carried on the first frequency domain unit of the SSB of the third period. In this way, the divided three sub-PBCHs are traversed on the first frequency domain unit of the SSBs of the three periods, so that the small-bandwidth terminal device receives the three sub-PBCHs through the first frequency domain unit of the SSBs of the three periods, and accesses the network device.

[0167] As can be seen, PBCH#0, PBCH#1, and PBCH#3 are traversed once on the first frequency domain unit of the SSBs of the three periods through cyclic shifting, and the number of periods traversed is three.

[0168] As an example, the dashed rectangular frame area in (b) in FIG. 10 is the bandwidth range supported by the terminal device, the first frequency domain unit is the 80th-159th subcarrier, the second frequency domain unit is the 0th-79th subcarrier, and the third frequency domain unit is the 160th-239th subcarrier. In the first period, PBCH#0 is carried on the first frequency domain unit, PBCH#1 is carried on the second frequency domain unit, and PBCH#2 is carried on the third frequency domain unit. In the second period, PBCH#2 carried on the first frequency domain unit is obtained by changing the resource mapping position in the frequency domain of PBCH#2 carried on the third frequency domain unit of the SSB of the first period. In the third period, PBCH#1 carried on the first frequency domain unit is obtained by changing the resource mapping position in the frequency domain of PBCH#1 carried on the second frequency domain unit of the SSB of the second period.

[0169] It can be seen that, different from the cyclic shift, in the N periodic SSBs, the frequency domain elements carrying the same sub-PBCH can be the same or different; while in the cyclic shift, the frequency domain elements occupied by the same sub-PBCH in the SSBs in different periods are different. However, whether it is the resource mapping position variation or the cyclic shift mode, it is necessary to ensure that the first frequency domain elements of the N periodic SSBs carry different sub-PBCHs, and the multiple sub-PBCHs divided by the first PBCH are traversed on the first frequency domain elements of the N periodic SSBs.

[0170] It should be noted that the N periods in the present application do not refer to all the periods (hereinafter referred to as "actual transmission periods") in which the network device actually transmits the SSBs, but refer to the number of periods required for the multiple sub-PBCHs divided by the first PBCH to complete traversal on the first frequency domain elements. For example, when the first PBCH is divided into 2 parts, the number of periods N = 2; when the first PBCH is divided into 3 parts, the number of periods N = 3; when the first PBCH is divided into 4 parts, the number of periods N = 4. For the sake of brevity, they will not be listed one by one. The actual transmission period can include the N periods, so that the terminal device can receive the multiple sub-PBCHs divided by the first PBCH, thereby accessing the network device.

[0171] In one mode, the synchronization resource blocks in the N periods satisfy the following relationship between the synchronization resource block in the n th period and the synchronization resource block in the n+1 th period:

[0172] The physical broadcast sub-channel carried on the first frequency domain element of the synchronization resource block in the n+1 th period is the same as the physical broadcast sub-channel carried on the second frequency domain element of the synchronization resource block in the n th period, the frequency domain mapping position interval between the second frequency domain element and the first frequency domain element is a preset value, and n = 1, 2, …, N-1.

[0173] In one mode, the synchronization resource blocks in the N periods satisfy the following relationship between the synchronization resource block in the n th period and the synchronization resource block in the n+1 th period: the physical broadcast channel carried on the first frequency domain element of the synchronization resource block in the n+1 th period is the same as the physical broadcast channel carried on the second frequency domain element of the synchronization resource block in the n th period, the frequency domain mapping position interval between the second frequency domain element and the first frequency domain element is a preset value, and n = 1, 2, …, N-1.

[0174] Exemplarily, as shown in (b) of FIG. 9, when the first PBCH is divided into PBCH#0 and PBCH#1 and N=2, the first frequency domain unit is the 56th-182nd subcarriers in the dashed rectangular frame in (b) of FIG. 9, and the second frequency domain unit is the 0th-55th and 183rd-239th subcarriers. In the first period, PBCH#0 is carried on the first frequency domain unit, and PBCH#1 is carried on the second frequency domain unit. In the second period, PBCH#1 is carried on the first frequency domain unit, and PBCH#0 is carried on the second frequency domain unit. It can be seen that the PBCH carried on the first frequency domain unit of the SSB in the second period is the same as the PBCH carried on the second frequency domain unit of the SSB in the first period, and the frequency domain mapping position interval between the first frequency domain unit and the second frequency domain unit is 0.

[0175] Exemplarily, as shown in (a) of FIG. 10, when the first PBCH is divided into PBCH#0, PBCH#1 and PBCH#3 and N=3, the first frequency domain unit is the 80th-159th subcarriers, the second frequency domain unit is the 0th-79th subcarriers, and the third frequency domain unit is the 160th-239th subcarriers. In the first period, PBCH#0 is carried on the first frequency domain unit, and PBCH#1 is carried on the second frequency domain unit. In the second period, PBCH#1 is carried on the first frequency domain unit, and PBCH#2 is carried on the second frequency domain unit. In the third period, PBCH#2 is carried on the first frequency domain unit, and PBCH#0 is carried on the second frequency domain unit. It can be seen that the PBCH carried on the first frequency domain unit of the SSB in the third period is the same as the PBCH carried on the second frequency domain unit of the SSB in the second period, the PBCH carried on the first frequency domain unit of the SSB in the second period is the same as the PBCH carried on the second frequency domain unit of the SSB in the first period, and the frequency domain mapping position interval between the first frequency domain unit and the second frequency domain unit is 0.

[0176] For ease of understanding, the following subcarrier spacing is exemplarily taken as 30 kHz to illustrate that the first frequency domain unit is located in the bandwidth range of the small bandwidth terminal device, but it should be understood that the subcarrier spacing can also be other values, such as 15 kHz, 60 kHz, etc., which are not limited in the present application.

[0177] When the subcarrier spacing is 30 kHz, as shown in (b) of FIG. 9, the 56th to 182nd subcarriers in the dashed box are an example of the first frequency domain unit, and the bandwidth of the first frequency domain unit in the first period of SSB is equal to 12 RBs @ 30 kHz -> 4.3 MHz. A small bandwidth terminal device, such as a 5M terminal device, has a bandwidth greater than 4.3 MHz, so the first frequency domain unit is within the bandwidth of the 5M terminal device. Therefore, the 5M terminal device can receive PBCH#0 in the first frequency domain unit of the first SSB in the first period. In the second period, PBCH#1 at both ends is moved to the first frequency domain unit, i.e., the PBCH#1 occupying 8 RBs is moved to the first frequency domain unit, and the bandwidth of 8 RBs is equal to 8 RBs @ 30 kHz -> 2.8 MHz, 2.8 MHz < 4.3 MHz < 5 MHz. Therefore, the 5M terminal device can receive PBCH#1 in the first frequency domain unit of the second SSB in the second period. Through the first period and the second period, the 5M terminal device can obtain the complete first PBCH (i.e., PBCH#0 and PBCH#1), and enable the small bandwidth terminal device to access the network device.

[0178] In one manner, the synchronization resource block is further configured to carry a primary synchronization signal and a secondary synchronization signal, the primary synchronization signal and / or the secondary synchronization signal being used to indicate a location of the frequency domain unit occupied by the plurality of physical broadcast subchannels.

[0179] Specifically, the primary synchronization signal and / or the secondary synchronization signal are used to explicitly or implicitly indicate the location of the frequency domain unit occupied by the plurality of physical broadcast subchannels.

[0180] The following illustrates that the primary synchronization signal and / or the secondary synchronization signal are used to explicitly indicate the location of the frequency domain unit occupied by the plurality of physical broadcast subchannels.

[0181] For example, the PSS and / or the SSS include M-bit information, and the M-bit information includes the location of the frequency domain unit occupied by N sub-PBCHs. The N sub-PBCHs are an example of the plurality of physical broadcast subchannels. When N is even, M = log2N; when N is odd, M = log2(N+1).

[0182] Exemplarily, when N=2, the first PBCH is divided into 2 sub-PBCHs (e.g., PBCH#0 and PBCH#1), 1 bit of information can be included in the PSS and / or SSS, the 1 bit of information includes frequency domain positions occupied by PBCH#0 and PBCH#1, for example, 0 represents that PBCH#0 occupies the frequency domain position in the SSB, and 1 represents that PBCH#1 occupies the frequency domain position in the SSB; or, 1 represents that PBCH#0 occupies the frequency domain position in the SSB, and 0 represents that PBCH#1 occupies the frequency domain position in the SSB. The terminal device can directly determine the frequency domain position occupied by PBCH#0 and the frequency domain position occupied by PBCH#1 according to the 1 bit of information.

[0183] Exemplarily, when N=3, the first PBCH is divided into 3 sub-PBCHs (e.g., PBCH#0, PBCH#1 and PBCH#2), 2 bits of information can be included in the PSS and / or SSS, the 2 bits of information include frequency domain positions occupied by PBCH#0, PBCH#1 and PBCH#2, the 2 bits can be represented as 00, 01, 10, 11 four states, and the states are used to represent data. For example, 00 represents PBCH#0, 01 represents PBCH#1, 10 represents PBCH#2, or 00 represents PBCH#0, 10 represents PBCH#1, 11 represents PBCH#2, and the like, which will not be listed one by one. It can be understood that when N is 3, PBCH#0, PBCH#1 and PBCH#2 can be represented by any three states of the four states.

[0184] As can be seen from the above, the display indication can be understood as that the primary synchronization signal and / or the secondary synchronization signal directly indicates the positions of the frequency domain units occupied by the plurality of physical broadcast sub-channels, and the terminal device can directly obtain / directly know the positions of the frequency domain units occupied by the plurality of physical broadcast sub-channels according to the primary synchronization signal and / or the secondary synchronization signal.

[0185] The primary synchronization signal and / or the secondary synchronization signal for implicitly indicating the positions of the frequency domain units occupied by the plurality of physical broadcast sub-channels will be exemplarily described below.

[0186] Exemplarily, when N=2, the first PBCH is divided into 2 sub-PBCHs (e.g., PBCH#0 and PBCH#1), the PSS and / or SSS only includes the frequency domain position occupied by PBCH#0, and the terminal device can infer the frequency domain position occupied by PBCH#1 according to the PSS and / or SSS.

[0187] Exemplarily, when N=3, the first PBCH is divided into 3 sub-PBCHs (e.g., PBCH#0, PBCH#1 and PBCH#2), the PSS and / or SSS includes the frequency domain positions occupied by any two of the PBCH#0, PBCH#1 and PBCH#2, for example, the PSS and / or SSS includes the frequency domain positions occupied by the PBCH#0 and PBCH#1, and the terminal device can infer the frequency domain position occupied by the PBCH#2 according to the PSS and / or SSS.

[0188] As can be seen from the above, the implicit indication can be understood as that the PSS and / or SSS indirectly indicates the positions of the frequency domain units occupied by the plurality of PBCHs, and the terminal device cannot directly obtain the positions of the frequency domain units occupied by the plurality of PBCHs according to the PSS and / or SSS, but can infer the positions of the frequency domain units occupied by the plurality of PBCHs according to the PSS and / or SSS.

[0189] In one way, the PBCH received by the terminal device in each cycle can be used to indicate the positions of the frequency domain units occupied by the plurality of PBCHs. Specifically, the PBCH received by the terminal device in each cycle can be used to explicitly or implicitly indicate the positions of the frequency domain units occupied by the plurality of PBCHs.

[0190] In one way, the terminal device can determine whether the cycle in which the terminal device currently receives the SSB is a cyclic shift or resource mapping position variation cycle according to the PSS and / or SSS and / or the PBCH.

[0191] Specifically, the terminal device can determine the positions of the frequency domain units occupied by the plurality of PBCHs according to the PSS and / or SSS and / or the PBCH; and determine whether the cycle in which the terminal device currently receives the SSB is a cyclic shift or resource mapping position variation cycle according to the positions of the frequency domain units occupied by the plurality of PBCHs.

[0192] Exemplarily, as shown in (b) of FIG. 9, it can be known from the above that the subcarriers occupied by the first PBCH are divided into two parts according to the center or the edge, one part is the 56th-182nd subcarriers, and the PBCH carried by the 56th-182nd subcarriers is referred to as PBCH#0; the other part is the 0th-35th and 180th-239th subcarriers, and the PBCH carried by the 0th-35th and 180th-239th subcarriers is referred to as PBCH#1. When the terminal device receives an SSB in a certain period, for example, when the first SSB is received in the first period, according to the PSS and / or SSS of the first SSB and / or the frequency domain positions of the PBCH#0 and PBCH#1 indicated by the PBCH#0, it can be known that the frequency domain position of the PBCH#0 is at the 56th-182nd subcarrier position, and the frequency domain position of the PBCH#1 is at the 0th-35th and 180th-239th subcarrier position. It can be seen that the PBCH#0 and PBCH#1 in the SSB of the first period do not change in the frequency domain, so the terminal device can determine that the first period is not a cyclic shift or resource mapping position change period. For another example, when the terminal device receives the second SSB in the second period, according to the PSS and / or SSS of the first SSB and / or the frequency domain positions of the PBCH#0 and PBCH#1 indicated by the PBCH#0, it can be known that the frequency domain position of the PBCH#0 is at the 0th-35th and 180th-239th subcarrier position, and the frequency domain position of the PBCH#1 is at the 56th-182nd subcarrier position. It can be seen that the PBCH#0 and PBCH#1 in the SSB of the second period change in the frequency domain, so the terminal device can determine that the second period is a cyclic shift or resource mapping position change period.

[0193] In S220, the terminal device accesses the network device according to the physical broadcast subchannel carried in the first frequency domain unit of the synchronization resource block in the N periods.

[0194] In one manner, a large-bandwidth terminal device can quickly access a network device in the frequency domain. The large-bandwidth terminal device supports a bandwidth greater than or equal to the bandwidth corresponding to the synchronization resource block.

[0195] In the following, the synchronization resource block is taken as an SSB, and the first PBCH is taken as two sub-PBCHs (i.e., PBCH#0 and PBCH#1) for example. The PBCH#0 and PBCH#1 are an example of a physical broadcast subchannel.

[0196] FIG. 11 is a schematic diagram of two ways of enabling terminals of different specifications to access. As can be understood from the above, the N periods in the present application refer to the number of periods required for the plurality of sub-PBCHs divided by the first PBCH to complete traversal on the first frequency domain unit, and thus N = 2. The N periods are not actual transmission periods (for example, S transmission periods in FIG. 11). As shown in FIG. 11, the two transmission periods of the first transmission period and the second transmission period can be an example of the N periods, and the two transmission periods of the S-1 transmission period and the S transmission period can also be an example of the N periods. As can be seen, the S transmission periods can include the N periods.

[0197] The first transmission period and the second transmission period are taken as an example to illustrate the N periods below. The subcarriers occupied by the first PBCH in the SSB are divided into two parts according to the center and the edge, one part is subcarriers 56-182, and the PBCH carried by the subcarriers 56-182 is referred to as PBCH#0; the other part is subcarriers 0-55 and 183-239, and the PBCH carried by the subcarriers 0-55 and 183-239 is referred to as PBCH#1.

[0198] As shown in FIG. 11, the bandwidth supported by the large-bandwidth terminal device is greater than or equal to the bandwidth corresponding to the SSB shown in FIG. 11, that is, the bandwidth range supported by the large-bandwidth terminal device can cover the entire 240 subcarriers corresponding to the SSB. The dashed rectangular frame region in the frequency domain access (fast) in FIG. 11 is an example of the bandwidth range supported by the large-bandwidth terminal device. In the first transmission period, the large-bandwidth terminal device receives the first SSB, and can search for the PSS and the SSS of the first SSB at a fixed frequency point to perform downlink synchronization. The large-bandwidth terminal device extracts the frequency domain mapping mode of the PSS and / or the SSS, determines the frequency domain positions occupied by the PBCH#0 and the PBCH#1 in the first SSB; and according to the frequency domain positions occupied by the PBCH#0 and the PBCH#1 in the first SSB, it can be determined that the first transmission period is not a cyclic shift / resource mapping position variation period. For details of determining whether it is a cyclic shift / resource mapping position variation period, please refer to S210, which will not be described here. Since the first frequency domain unit is located within the bandwidth range supported by the large-bandwidth terminal device, the large-bandwidth terminal device can receive the PBCH#0 and the PBCH#1 on the first SSB, and recombine the subcarriers carrying the PBCH#0 and the PBCH#1 on the first symbol, the second symbol and the third symbol together, and access the network device through the PBCH (i.e., the first PBCH) carried by the subcarriers after frequency domain recombination.

[0199] For example, in the first transmission period, the large bandwidth terminal device receives the second SSB, and can search for the PSS and SSS of the first SSB at a fixed frequency point to perform downlink synchronization; according to the frequency domain mapping mode of the extracted PSS and / or SSS, the frequency domain positions occupied by PBCH#0 and PBCH#1 in the second SSB are determined; according to the frequency domain positions occupied by PBCH#0 and PBCH#1 in the second SSB, it can be determined that the second transmission period is a cyclic shift / resource mapping position variation period, so it is necessary to first perform frequency domain restoration, that is, PBCH#1 located in the first frequency domain unit is restored to subcarriers 0-55 and 183-239, and PBCH#0 occupying the subcarrier positions at both ends of the SSB is restored to subcarriers 56-182. After frequency domain reorganization, the PBCH (i.e., the first PBCH) carried on the subcarriers corresponding to the first symbol, the second symbol and the third symbol is accessed to the network device, and the complete initial access information is obtained by decoding the PBCH.

[0200] In the above manner, the process of the large bandwidth terminal device obtaining the complete first PBCH to access the network device is perfected in the case where the frequency domain resource of the PBCH is divided into two parts.

[0201] In another manner, the small bandwidth terminal device can access the network device through time domain narrowband, and the bandwidth supported by the small bandwidth terminal device is less than the bandwidth corresponding to the synchronization resource block.

[0202] The following is an example description taking the synchronization resource block as the SSB and the first PBCH as two sub-PBCHs (i.e., PBCH#0 and PBCH#1). PBCH#0 and PBCH#1 are examples of physical broadcast subchannels. The following is an example description taking the first transmission period and the second transmission period as the N periods. And taking the subcarriers occupied by the first PBCH in the SSB as two parts of subcarriers according to the center and the edge, one part is subcarriers 56-182, and the PBCH carried by the subcarriers 56-182 is called PBCH#0; the other part is subcarriers 0-55 and 183-239, and the PBCH carried by the subcarriers 0-55 and 183-239 is called PBCH#1.

[0203] Exemplarily, as shown in FIG. 11, the bandwidth supported by the small-bandwidth terminal device is smaller than the bandwidth corresponding to the SSB shown in FIG. 11, that is, the bandwidth range supported by the small-bandwidth terminal device can only cover part of the 240 subcarriers corresponding to the entire SSB, and the 56th-182nd subcarriers in the dashed-line rectangular frame in the time domain access (narrowband) in FIG. 11 are an example of the first frequency domain unit. In the first sending period, the small-bandwidth terminal device receives the first SSB, and can search for the PSS and the SSS of the first SSB at a fixed frequency point to perform downlink synchronization. The small-bandwidth terminal device extracts the frequency domain mapping mode of the PSS and / or the SSS, determines the frequency domain positions occupied by the PBCH#0 and the PBCH#1 in the first SSB, and determines that the first sending period is not a cyclic shift / resource mapping position variation period according to the frequency domain positions occupied by the PBCH#0 and the PBCH#1 in the first SSB. Whether the period is a cyclic shift / resource mapping position variation period can be determined by referring to S210, which will not be described herein again. Since the first frequency domain unit is located in the bandwidth range supported by the small-bandwidth terminal device, the small-bandwidth terminal device can receive the PBCH#0 on the first frequency domain unit of the first SSB.

[0204] As can be seen from the above, in the second sending period, the PBCH#1 located in the 0th-55th and 183rd-239th subcarriers of the first SSB in the first sending period is moved to the first frequency domain unit of the second SSB in the second sending period through cyclic shift in the frequency domain or resource mapping position variation in the frequency domain. Exemplarily, the PBCH#1 is moved to the 63rd-175th subcarriers, and the 63rd-175th subcarriers belong to the first frequency domain unit, so the small-bandwidth terminal device can receive the PBCH#1 on the first frequency domain unit of the second SSB. The small-bandwidth terminal device recombines the subcarriers of the PBCH#0 and the PBCH#1 obtained in the two periods together, and accesses the network device through the PBCH (that is, the first PBCH) carried on the subcarriers corresponding to the 1st symbol, the 2nd symbol and the 3rd symbol after frequency domain recombination.

[0205] For another example, in the second sending period, the small-bandwidth terminal device receives the second SSB and can search for the PSS and SSS of the first SSB at a fixed frequency point to perform downlink synchronization; according to the frequency domain mapping manner of the extracted PSS and / or SSS, the frequency domain positions occupied by the PBCH#0 and PBCH#1 in the second SSB are determined; according to the frequency domain positions occupied by the PBCH#0 and PBCH#1 in the second SSB, it can be determined that the second sending period is a cyclic shift / resource mapping position variation period, and the small-bandwidth terminal device receives the PBCH#1 in the first frequency domain unit. In the period after the second sending period, for example, in the S-1 sending period, the small-bandwidth terminal device receives the PBCH#0 carried on the first frequency domain unit of the first SSB, and the small-bandwidth terminal device performs frequency domain recovery and frequency domain recombination on the PBCH#0 and PBCH#1 obtained in the two periods, that is, the PBCH#1 located in the first frequency domain unit is recovered to the subcarriers numbered 0-55 and 183-239, while the PBCH#0 occupying the subcarrier positions at both ends of the SSB is recovered to the subcarriers numbered 56-182, and the recovered subcarriers carrying the PBCH#0 and PBCH#1 are recombined together, and the small-bandwidth terminal device accesses the network device through the PBCH (that is, the first PBCH) carried on the subcarriers corresponding to the first symbol, the second symbol and the third symbol after frequency domain recombination. The subcarriers after frequency domain recombination obtain complete initial access information through PBCH decoding.

[0206] The above manner perfects the process in which the small-bandwidth terminal device obtains complete first PBCH to access the network device in the case where the frequency domain resource of the PBCH is divided into two parts.

[0207] Based on the above scheme, the terminal device can receive the SSB from the network device through N periods, the first PBCH carried on the SSB received in each period is divided into multiple sub-PBCH, and the sub-PBCH carried on the first frequency domain unit of the SSB in the N periods is different. When the terminal device is a small-bandwidth terminal device, that is, the bandwidth supported by the terminal device is less than the bandwidth corresponding to the synchronization resource block, for example, the terminal device can only receive the sub-PBCH carried on the first frequency domain unit in each period, and the small-bandwidth terminal device can access the network device through the multiple sub-PBCH carried on the first frequency domain unit of the SSB received in the N periods, thereby enabling the small-bandwidth terminal device to access the network device.

[0208] In various embodiments of the present application, the terms and / or descriptions of different embodiments are consistent and can be mutually referred to if there is no special description and logical conflict, and the technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationship.

[0209] In some embodiments described above, the devices (e.g., terminal device, network device) in the existing network architecture are mainly exemplified and described. The specific form of the device is not limited in the embodiments of the present application. For example, devices having the same function in the future are also applicable to the embodiments of the present application.

[0210] It can be understood that, in each of the above method embodiments, the method and operation implemented by the device (e.g., terminal device, network device) can also be implemented by a component (e.g., chip or circuit) of the device.

[0211] The above describes the communication method provided by the embodiments of the present application in detail in combination with FIG. 8. The above communication method is mainly introduced from the perspective of interaction between the terminal device and the network device. It can be understood that, in order to implement the above functions, the terminal device and the network device include the corresponding hardware structure and / or software module for executing each function.

[0212] Those skilled in the art should understand that, in combination with the units and algorithm steps of each example described in the embodiments disclosed in the present application, the present application can be implemented in the form of hardware or a combination of hardware and computer software. Whether a certain function is implemented in hardware or computer software driven hardware depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0213] The following describes the communication apparatus provided by the embodiments of the present application in combination with FIGS. 11 to 13. The description of the apparatus embodiments corresponds to the description of the method embodiments, and thus, the content not described in detail can be referred to the above method embodiments, and part of the content will not be described again for brevity.

[0214] In order to implement each function of the communication apparatus (e.g., terminal device, network device, etc.) in the embodiments of the present application, each communication apparatus can implement the corresponding function in the form of hardware structure, software module, or hardware structure plus software module.

[0215] FIG. 12 is a schematic block diagram of the communication apparatus 1000 provided by the embodiments of the present application. As shown in FIG. 12, the communication apparatus 1000 can include a transceiver unit 1010 and a processing unit 1020. The transceiver unit 1010 can communicate with the outside, and the processing unit 1020 is configured to process data. The transceiver unit 1010 can also be referred to as a communication interface or a transceiver unit. The processing unit 1020 can be configured to process.

[0216] Optionally, the communication apparatus 1000 further includes a storage unit, which can be used to store instructions and / or data. The processing unit 1020 can read the instructions and / or data in the storage unit, so that the apparatus implements the foregoing method embodiments.

[0217] For example, the communication apparatus 1000 is a terminal device, or a communication apparatus applied to or matched with the terminal device, capable of implementing the method executed by the terminal device, such as a chip, chip system or circuit. For details, refer to the related description of the chip system shown in FIG. 14.

[0218] For example, the communication apparatus 1000 is a network device, or a communication apparatus applied to or matched with the network device, capable of implementing the method executed by the network device, such as a chip, chip system or circuit. For details, refer to the related description of the chip system shown in FIG. 14.

[0219] In a possible design, the communication apparatus 1000 can implement the steps or procedures corresponding to those executed by the terminal device in the foregoing method embodiments, where the processing unit 1020 is configured to perform processing-related operations of the terminal device in the foregoing method embodiments, and the transceiver unit 1010 is configured to perform transceiving-related operations of the terminal device in the foregoing method embodiments.

[0220] For example, the transceiver unit 1010 is configured to receive, in N periods, synchronization resource blocks from the network device, where the physical broadcast channel carried on the synchronization resource blocks is divided into a plurality of physical broadcast sub-channels, the physical broadcast sub-channels carried on the first frequency domain units of the synchronization resource blocks in the N periods are different, the bandwidth of the first frequency domain unit is smaller than the bandwidth corresponding to the synchronization resource block, and the first frequency domain unit is located in the bandwidth range supported by the terminal device, and N is an integer greater than 1. The processing unit 1020 is configured to access the network device according to the physical broadcast sub-channels carried on the first frequency domain units of the synchronization resource blocks in the N periods.

[0221] In another possible design, the communication apparatus 1000 can implement the steps or procedures corresponding to those executed by the network device in the foregoing method embodiments, where the transceiver unit 1010 is configured to perform transceiving-related operations of the network device in the foregoing method embodiments, and the processing unit 1020 is configured to perform processing-related operations of the network device in the foregoing method embodiments.

[0222] Exemplarily, the transceiver unit 1010 is configured to transmit, to the terminal device, synchronization resource blocks in N periods respectively, a physical broadcast channel carried on the synchronization resource blocks is divided into a plurality of physical broadcast sub-channels, the plurality of physical broadcast sub-channels are used for the terminal device to access the network device, and a physical broadcast sub-channel carried on a first frequency domain unit of the synchronization resource blocks in the N periods is different, a bandwidth of the first frequency domain unit is smaller than a bandwidth corresponding to the synchronization resource blocks, and the first frequency domain unit is located in a bandwidth range supported by the terminal device, and N is an integer greater than 1.

[0223] It should be understood that the communication apparatus 1000 herein is embodied in the form of functional units. The term "unit" herein can refer to an application specific integrated circuit (ASIC), an electronic circuit, a processor (for example, a shared processor, a dedicated processor, or a group processor and the like) and a memory for executing one or more software or firmware programs, a combination of logical circuit and / or other suitable components supporting the described functions. In an optional example, those skilled in the art can understand that the communication apparatus 1000 can be embodied as the sending end in the above-mentioned embodiments, and can be used to execute the processes and / or steps corresponding to the sending end in the above-mentioned method embodiments. Alternatively, the communication apparatus 1000 can be embodied as the receiving end in the above-mentioned embodiments, and can be used to execute the processes and / or steps corresponding to the receiving end in the above-mentioned method embodiments. To avoid repetition, details are not described here.

[0224] The communication apparatus 1000 of each of the above-mentioned schemes has a function of implementing the corresponding steps performed by the sending end in the above-mentioned methods, or the communication apparatus 1000 of each of the above-mentioned schemes has a function of implementing the corresponding steps performed by the receiving end in the above-mentioned methods. The function can be implemented by hardware or by executing corresponding software 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, which respectively executes the transceiving operations and related processing operations in each method embodiment.

[0225] In addition, the above-mentioned transceiver unit can also be a transceiver circuit (for example, which can include a receiving circuit and a sending circuit), and the processing unit can be a processing circuit. In the embodiments of the present application, the above-mentioned communication apparatus can be the receiving end or the sending end in the foregoing embodiments, or can be a chip or a chip system, for example, a system on chip (SoC). Wherein, the transceiver unit can be an input / output circuit, a communication interface. The processing unit is a processor or a microprocessor integrated on the chip or an integrated circuit. Herein, no limitation is made.

[0226] Fig. 13 is a schematic block diagram of the communication apparatus 2000 according to an embodiment of the present application. As shown in Fig. 13, the communication apparatus 2000 includes a processor 2010 and a transceiver 2020. The processor 2010 and the transceiver 2020 communicate with each other through an internal connection path. The processor 2010 is configured to execute instructions to control the transceiver 2020 to transmit and / or receive signals.

[0227] Optionally, the communication apparatus 2000 further includes a memory 2030, which communicates with the processor 2010 and the transceiver 2020 through an internal connection path. The memory 2030 is configured to store instructions, and the processor 2010 is configured to execute the instructions stored in the memory 2030.

[0228] In a possible implementation, the communication apparatus 2000 is configured to implement the procedures and steps corresponding to the terminal device in the above-described method embodiments.

[0229] In another possible implementation, the communication apparatus 2000 is configured to implement the procedures and steps corresponding to the network device in the above-described method embodiments.

[0230] Optionally, the memory 2030 can include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory can also include a non-volatile random access memory. For example, the memory can also store device type information. The processor 2010 can be configured to execute the instructions stored in the memory, and when the processor 2010 executes the instructions stored in the memory, the processor 2010 is configured to perform the steps and / or procedures of the above-described method embodiments corresponding to the transmitting end or the receiving end.

[0231] In the implementation process, the steps of the above-described method can be completed by the integrated logic circuits of hardware in the processor or the instructions in the form of software. The steps of the method disclosed in the embodiments of the present application can be directly embodied as the execution completed by the hardware processor, or the execution completed by the combination of hardware and software modules in the processor. The software module can be located in the storage medium which is mature in the art, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, register, etc. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above-described method. To avoid repetition, it will not be described in detail here.

[0232] It should be noted that the processor in the embodiments of the present application can be an integrated circuit chip with a processing capability of signals. In the implementation process, each step of the method embodiments can be completed by the integrated logic circuit of hardware in the processor or the instructions in the form of software. The processor mentioned above can be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, or a part of circuit in the foregoing CPU, other general processor, DSP, ASIC, FGPA or other programmable logic device, or other chip for processing functions. The processor in the embodiments of the present application can implement or execute the methods, steps and logic block diagrams disclosed in the embodiments of the present application. The general processor can be a microprocessor or the processor can also be any conventional processor or the like. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as a hardware code processor for execution, or be executed by a combination of hardware and software modules in the code 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, an electrically erasable programmable memory, a register or the like. The storage medium is located in the storage, and the processor reads the information in the storage, and combines the hardware to complete the steps of the method.

[0233] It is to be understood that the memory in the embodiments of the present application can be a volatile memory or a non-volatile memory, or can include both volatile and non-volatile memories. Among them, the non-volatile memory can be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically EPROM (EEPROM) or a flash memory. The volatile memory can be a random access memory (RAM) used as an external cache. By way of example, but not limitation, many forms of RAM can be used, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous dynamic RAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM) and direct rambus RAM (DR RAM). It should be noted that the memory of the system and method described herein is intended to include, but not limited to, these and any other suitable types of memory.

[0234] In the embodiments of the present application, the above-mentioned method can be executed by the terminal device and the network device, or can be executed by the chip, chip system or circuit of the terminal device and the network device, which can be installed in the terminal device and the network device. In the following, the chip system of the terminal device and the network device will be described in conjunction with FIG. 14.

[0235] FIG. 14 is a schematic block diagram of a chip system 3000 provided by an embodiment of the present application. As shown in FIG. 14, the chip system 3000 (or also can be referred to as a processing system) includes a logic circuit 3010 and an input / output interface 3020.

[0236] The logic circuit 3010 can be a processing circuit in the chip system 3000. The logic circuit 3010 can be coupled to a storage unit, invoke instructions in the storage unit, so that the chip system 3000 can implement the methods and functions of the embodiments of the present application. The input / output interface 3020 can be an input / output circuit in the chip system 3000, output the processed information of the chip system 3000, or input the data or signaling information to be processed into the chip system 3000 for processing.

[0237] As an option, the chip system 3000 is configured to implement the operations performed by the terminal device and the network device in the above method embodiments.

[0238] For example, the logic circuit 3010 is configured to implement the processing-related operations performed by the terminal device in the above method embodiments, such as the processing-related operations performed by the terminal device in the above embodiments; and the input / output interface 3020 is configured to implement the sending and / or receiving-related operations performed by the terminal device in the above method embodiments, such as the sending and / or receiving-related operations performed by the terminal device in the above embodiments.

[0239] For another example, the logic circuit 3010 is configured to implement the processing-related operations performed by the network device in the above method embodiments, such as the processing-related operations performed by the network device in the above embodiments; and the input / output interface 3020 is configured to implement the sending and / or receiving-related operations performed by the network device in the above method embodiments, such as the sending and / or receiving-related operations performed by the network device in the above embodiments.

[0240] The embodiments of the present application also provide a computer readable storage medium, which stores computer instructions for implementing the method performed by the terminal device or the network device in the above method embodiments.

[0241] The embodiments of the present application also provide a computer program product, which contains instructions executed by a computer to implement the method performed by the terminal device or the network device in the above method embodiments.

[0242] The embodiments of the present application also provide a communication system, which includes the terminal device or the network device in the above embodiments.

[0243] The explanations and beneficial effects of the related contents in any of the above communication devices can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0244] In the present application, the methods and / or terms between the method embodiments can be mutually referenced without logical contradiction, for example, the functions and / or terms between the device embodiments can be mutually referenced, for example, the functions and / or terms between the device examples and the method examples can be mutually referenced.

[0245] In various embodiments of the present application, the size of the sequence number of the above processes does not mean the order of execution, the execution order of each process should be determined by its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0246] Those skilled in the art can appreciate that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be realized in electronic hardware or a combination of computer software and electronic hardware. Whether the functions are realized in hardware or software depends on the specific application and design constraints of the technical solution. The skilled person can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of the present application.

[0247] Those skilled in the art can clearly understand that, for the convenience and brevity of the description, the specific working process of the above-described system, device and unit can refer to the corresponding process in the foregoing method embodiments, which will not be repeated here.

[0248] In several embodiments provided in the present application, it should be understood that the disclosed system, device and method can be implemented in other ways. For example, the above-described device embodiments are only schematic, for example, the division of the units is only a logical function division, and actual implementation can have another division manner, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, and can be electrical, mechanical or other forms.

[0249] The units described as separate components can or can not be physically separated, and the components shown as units can or can not be physical units, that is, they can be located in one place, or can be distributed on a plurality of network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0250] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0251] If the functions are implemented in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the parts that contribute to the prior art or parts of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes a plurality of instructions for causing 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 methods described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0252] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A communication method characterized by comprising: The application is applied to a terminal device, comprising: In N cycles, respectively receiving synchronization resource blocks from a network device, a physical broadcast channel carried on the synchronization resource blocks is divided into a plurality of physical broadcast sub-channels, and the physical broadcast sub-channels carried on the first frequency domain units of the synchronization resource blocks in the N cycles are different, the bandwidth of the first frequency domain unit is smaller than the bandwidth corresponding to the synchronization resource block, and the first frequency domain unit is located in the bandwidth range supported by the terminal device, and N is an integer greater than 1; According to the physical broadcast sub-channels carried on the first frequency domain units of the synchronization resource blocks in the N cycles, access the network device.

2. The method of claim 1, wherein, The center frequency point of the first frequency domain unit corresponds to the center frequency point of the synchronization resource block.

3. The method of claim 1, wherein, The first frequency domain unit is located at the bandwidth edge of the synchronization resource block in the frequency domain.

4. The method according to any one of claims 1 to 3, characterized in that, The value of N is 2.

5. The method according to any one of claims 1-4, characterized in that, The plurality of physical broadcast sub-channels are traversed on the first frequency domain units of the synchronization resource blocks in the N cycles through cyclic shift in the frequency domain or resource mapping position change in the frequency domain.

6. The method according to any one of claims 1-4, characterized in that, The synchronization resource block in the n th cycle and the synchronization resource block in the n+1 th cycle in the N cycles satisfy the following relationship: The physical broadcast sub-channels carried on the first frequency domain units of the synchronization resource block in the n+1 th cycle are the same as the physical broadcast sub-channels carried on the second frequency domain units of the synchronization resource block in the n th cycle, the frequency domain mapping position interval between the second frequency domain unit and the first frequency domain unit is a preset value, n=1, 2, …, N-1.

7. The method according to any one of claims 1 to 6, characterized in that, The synchronization resource block is also used to carry a primary synchronization signal and a secondary synchronization signal, and the primary synchronization signal and / or the secondary synchronization signal are used to indicate the position of the frequency domain unit occupied by the plurality of physical broadcast sub-channels.

8. A communication method characterized by comprising: The application is applied to a network device, comprising: In N cycles, respectively sending synchronization resource blocks to a terminal device, a physical broadcast channel carried on the synchronization resource blocks is divided into a plurality of physical broadcast sub-channels, the plurality of physical broadcast sub-channels are used for terminal device to access the network device, and the physical broadcast sub-channels carried on the first frequency domain units of the synchronization resource blocks in the N cycles are different, the bandwidth of the first frequency domain unit is smaller than the bandwidth corresponding to the synchronization resource block, and the first frequency domain unit is located in the bandwidth range supported by the terminal device, and N is an integer greater than 1.

9. The method of claim 8, wherein, The center frequency point of the first frequency domain unit corresponds to the center frequency point of the synchronization resource block.

10. The method of claim 8, wherein, The first frequency domain unit is located at the bandwidth edge of the synchronization resource block in the frequency domain.

11. The method according to any one of claims 8-10, characterized in that, The value of N is 2.

12. The method according to any one of claims 8-11, characterized in that, The plurality of physical broadcast sub-channels are traversed on the first frequency domain units of the synchronization resource blocks in the N cycles through cyclic shift in the frequency domain or resource mapping position change in the frequency domain.

13. The method according to any one of claims 8-11, characterized in that, The synchronization resource block in the n th cycle and the synchronization resource block in the n+1 th cycle in the N cycles satisfy the following relationship: The physical broadcast channel carried on the first frequency domain unit of the synchronization resource block of the n+1th cycle is the same as the physical broadcast channel carried on the second frequency domain unit of the synchronization resource block of the n th cycle, a frequency domain mapping position interval between the second frequency domain unit and the first frequency domain unit is a preset value, n=1, 2, …, N-1.

14. The method according to any one of claims 8-13, characterized in that, The synchronization resource block is also used to carry a primary synchronization signal and a secondary synchronization signal, and the primary synchronization signal and / or the secondary synchronization signal are used to indicate the position of the frequency domain unit occupied by the plurality of physical broadcast channels.

15. A communications device, characterized by The communication device includes units or modules for performing the method of any one of claims 1 to 7, or the communication device includes units or modules for performing the method of any one of claims 8 to 14.

16. A computer readable storage medium characterized by The computer readable storage medium stores a computer program or instructions, when the computer program or instructions are run on a computer, the method of any one of claims 1 to 14 is executed.

17. A chip, characterized by Comprising: A processor for calling and running a computer program from a memory, so that the method of any one of claims 1 to 14 is executed.

18. A computer program product, characterised in that, When the computer program product is run on a computer, the method of any one of claims 1 to 14 is executed. When the computer program product is run on a computer, the method of any one of claims 1 to 14 is executed.

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