Communication method and communication apparatus

Abstract

The present application relates to the technical field of communications. Provided are a communication method and communication apparatus. The method comprises: acquiring M symbols of a physical broadcast channel (PBCH), the M symbols being mapped to PBCH time-frequency resources, the PBCH time-frequency resources comprising a first time-frequency resource and a second time-frequency resource, and subcarriers occupied by the first time-frequency resource not overlapping with subcarriers occupied by the second time-frequency resource, wherein M1 symbols among the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is a coded bit sequence in PBCH channel coding, Q is the modulation order of the PBCH, Q and N are positive integers, the M symbols, excluding the M1 symbols, are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1. The method in the embodiments of the present application can improve the communication effect of a terminal device.

Description

Communication method and communication device

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office on February 29, 2024, with application number 202410236101.2 and application name “Communication Method and Communication Device,” the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communication technology, and in particular to a communication method and a communication device. Background Art

[0003] With the development of communication technology, some communication systems have introduced narrow-bandwidth terminal devices (hereinafter referred to as narrow-band terminal devices) to reduce energy consumption and costs. However, the communication effect of narrow-band terminal devices is not ideal. Summary of the Invention

[0004] The present application provides a communication method and a communication device, which can improve the communication effect of terminal equipment.

[0005] In a first aspect, a communication method is provided, including: obtaining M symbols of a physical broadcast channel PBCH, the M symbols being mapped to PBCH time-frequency resources, the PBCH time-frequency resources including a first time-frequency resource and a second time-frequency resource, and the subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; wherein, M1 symbols of the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is a coded bit sequence of the PBCH channel coding, Q is a modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

[0006] In an embodiment of the present application, M1 consecutive symbols among M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource. In this way, when the first terminal device (such as a narrowband terminal device) receives PBCH on the first time-frequency resource, it can receive M1 consecutive symbols. Therefore, the detection performance of the first terminal device receiving PBCH can be improved, thereby improving the communication effect of the first terminal device.

[0007] At the same time, the remaining M-M1 symbols of the M symbols are mapped to the second time-frequency resources in the PBCH time-frequency resources. The subcarriers occupied by the first time-frequency resources and the second time-frequency resources do not overlap. In this way, although the mapping method of the symbols is changed, when the second terminal device (such as a broadband terminal device) receives PBCH on the PBCH time-frequency resources, it can still receive all M symbols, and will not affect the detection performance of the second terminal device receiving PBCH.

[0008] Furthermore, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0009] In some possible implementations, the first time-frequency resource is a common PBCH time-frequency resource for the first terminal device and the second terminal device, and the second time-frequency resource is a dedicated PBCH time-frequency resource of the second terminal device relative to the first terminal device.

[0010] In some possible implementations, the bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device, and less than or equal to the maximum receiving bandwidth of the second terminal device.

[0011] In some possible implementations, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0012] In some possible implementations, the union of the orthogonal frequency division multiplexing (OFDM) symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

[0013] In some possible implementations, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0014] In some possible implementations, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

[0015] In some possible implementations, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0016] In a second aspect, a communication method is provided, including: receiving M1 symbols of a physical broadcast channel (PBCH) on a first time-frequency resource in the PBCH time-frequency resources, the M1 symbols being M1 consecutive symbols among the M symbols of the PBCH, the M1 symbols being mapped to the first time-frequency resource, the M1 symbols being symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N being a coded bit sequence of the PBCH channel coding, Q being a modulation order of the PBCH, Q and N being positive integers, and M and M1 being positive integers greater than 1.

[0017] In an embodiment of the present application, M1 consecutive symbols among M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource. In this way, when the first terminal device (such as a narrowband terminal device) receives PBCH on the first time-frequency resource, it can receive M1 consecutive symbols. Therefore, the detection performance of the first terminal device receiving PBCH can be improved, thereby improving the communication effect of the first terminal device.

[0018] At the same time, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0019] In some possible implementations, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0020] In some possible implementations, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0021] In some possible implementations, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order.

[0022] In some possible implementations, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0023] A third aspect provides a communication method, including:

[0024] M symbols of PBCH are received on the physical broadcast channel PBCH time-frequency resources, and the M symbols are mapped to the PBCH time-frequency resources. The PBCH time-frequency resources include a first time-frequency resource and a second time-frequency resource, and the subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; wherein, M1 symbols of the M symbols are mapped to the first time-frequency resource, and the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, and N is a coded bit sequence of the PBCH channel coding, and Q is a modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

[0025] In an embodiment of the present application, M1 consecutive symbols among the M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource, and the remaining M-M1 symbols among the M symbols are mapped to the second time-frequency resource in the PBCH time-frequency resource. The subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap. In this way, although the mapping method of the symbols is changed, when the second terminal device (such as a broadband terminal device) receives PBCH on the PBCH time-frequency resource, all M symbols can still be received, and the detection performance of the second terminal device receiving PBCH will not be affected.

[0026] At the same time, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device (such as a narrowband terminal device) receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0027] In some possible implementations, the receiving of M symbols of the physical broadcast channel (PBCH) on the PBCH time-frequency resources includes: receiving M1 consecutive symbols of the M symbols on the first time-frequency resources in the PBCH time-frequency resources; and receiving the remaining M-M1 symbols on the second time-frequency resources in the PBCH time-frequency resources.

[0028] In some possible implementations, the first time-frequency resource is a common PBCH time-frequency resource of the first terminal device and the second terminal device.

[0029] In some possible implementations, the bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device, and less than or equal to the maximum receiving bandwidth of the second terminal device.

[0030] In some possible implementations, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0031] In some possible implementations, the union of the orthogonal frequency division multiplexing (OFDM) symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

[0032] In some possible implementations, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0033] In some possible implementations, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

[0034] In some possible implementations, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0035] In a fourth aspect, a communication device is provided, including: an acquisition unit, used to acquire M symbols of a physical broadcast channel PBCH, the M symbols being mapped to PBCH time-frequency resources, the PBCH time-frequency resources including a first time-frequency resource and a second time-frequency resource, and the subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; wherein, M1 symbols among the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is a coded bit sequence of the PBCH channel coding, Q is a modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

[0036] In an embodiment of the present application, M1 consecutive symbols among M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource. In this way, when the first terminal device (such as a narrowband terminal device) receives PBCH on the first time-frequency resource, it can receive M1 consecutive symbols. Therefore, the detection performance of the first terminal device receiving PBCH can be improved, thereby improving the communication effect of the narrowband terminal device.

[0037] At the same time, the remaining M-M1 symbols of the M symbols are mapped to the second time-frequency resources in the PBCH time-frequency resources. The subcarriers occupied by the first time-frequency resources and the second time-frequency resources do not overlap. In this way, although the mapping method of the symbols is changed, when the second terminal device (such as a broadband terminal device) receives PBCH on the PBCH time-frequency resources, it can still receive all M symbols, and will not affect the detection performance of the second terminal device receiving PBCH.

[0038] Furthermore, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0039] In some possible implementations, the first time-frequency resource is a common PBCH time-frequency resource for the first terminal device and the second terminal device, and the second time-frequency resource is a dedicated PBCH time-frequency resource of the second terminal device relative to the first terminal device.

[0040] In some possible implementations, the bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device, and less than or equal to the maximum receiving bandwidth of the second terminal device.

[0041] In some possible implementations, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0042] In some possible implementations, the union of the orthogonal frequency division multiplexing (OFDM) symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

[0043] In some possible implementations, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0044] In some possible implementations, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

[0045] In some possible implementations, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0046] In a fifth aspect, a communication device is provided, including: a receiving unit, used to receive M1 symbols of a physical broadcast channel (PBCH) on a first time-frequency resource in the PBCH time-frequency resource, the M1 symbols being M1 consecutive symbols among the M symbols of the PBCH, the M1 symbols being mapped to the first time-frequency resource, the M1 symbols being symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N being a coded bit sequence of the PBCH channel coding, Q being a modulation order of the PBCH, Q and N being positive integers, and M and M1 being positive integers greater than 1.

[0047] In an embodiment of the present application, M1 consecutive symbols among M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource. In this way, when the first terminal device (such as a narrowband terminal device) receives PBCH on the first time-frequency resource, it can receive M1 consecutive symbols. Therefore, the detection performance of the first terminal device receiving PBCH can be improved, thereby improving the communication effect of the first terminal device.

[0048] At the same time, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0049] In some possible implementations, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0050] In some possible implementations, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0051] In some possible implementations, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order.

[0052] In some possible implementations, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0053] In a sixth aspect, a communication device is provided, including:

[0054] A receiving unit is used to receive M symbols of a physical broadcast channel (PBCH) on a PBCH time-frequency resource, where the M symbols are mapped to the PBCH time-frequency resource, and the PBCH time-frequency resource includes a first time-frequency resource and a second time-frequency resource, and the subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; wherein, M1 symbols among the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is a coded bit sequence of the PBCH channel coding, Q is a modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

[0055] In an embodiment of the present application, M1 consecutive symbols among the M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource, and the remaining M-M1 symbols among the M symbols are mapped to the second time-frequency resource in the PBCH time-frequency resource. The subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap. In this way, although the mapping method of the symbols is changed, when the second terminal device (such as a broadband terminal device) receives PBCH on the PBCH time-frequency resource, all M symbols can still be received, and the detection performance of the second terminal device receiving PBCH will not be affected.

[0056] At the same time, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device (such as a narrowband terminal device) receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0057] In some possible implementations, the receiving unit is specifically used to: receive M1 consecutive symbols among the M symbols on the first time-frequency resource in the PBCH time-frequency resource; and receive the remaining M-M1 symbols on the second time-frequency resource in the PBCH time-frequency resource.

[0058] In some possible implementations, the first time-frequency resource is a common PBCH time-frequency resource of the first terminal device and the second terminal device.

[0059] In some possible implementations, the bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device, and less than or equal to the maximum receiving bandwidth of the second terminal device.

[0060] In some possible implementations, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0061] In some possible implementations, the union of the orthogonal frequency division multiplexing (OFDM) symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

[0062] In some possible implementations, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0063] In some possible implementations, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

[0064] In some possible implementations, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0065] In the seventh aspect, a communication device is provided, comprising: a processor and a memory, wherein the processor is coupled to the memory, and the memory is used to store a computer program (also referred to as code or instructions). When the computer program is executed by the processor, the device executes the method in the first aspect or any possible implementation of the first aspect.

[0066] In some possible implementations, the apparatus further includes a memory coupled to the processor.

[0067] In some possible implementations, there are one or more processors and / or one or more memories.

[0068] In some possible implementations, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0069] In an eighth aspect, a communication device is provided, comprising: a processor and a memory, wherein the processor is coupled to the memory, and the memory is used to store a computer program (also referred to as code or instructions). When the computer program is executed by the processor, the device executes the method in the second aspect or any possible implementation of the second aspect.

[0070] In some possible implementations, the apparatus further includes a memory coupled to the processor.

[0071] In some possible implementations, there are one or more processors and / or one or more memories.

[0072] In some possible implementations, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0073] In the ninth aspect, a communication device is provided, comprising: a processor and a memory, wherein the processor is coupled to the memory, and the memory is used to store a computer program (also referred to as code, or instructions). When the computer program is executed by the processor, the device executes the method in the third aspect or any possible implementation of the third aspect.

[0074] In some possible implementations, the apparatus further includes a memory coupled to the processor.

[0075] In some possible implementations, there are one or more processors and / or one or more memories.

[0076] In some possible implementations, the memory may be integrated with the processor, or the memory may be provided separately from the processor.

[0077] In the tenth aspect, a computer-readable storage medium is provided, on which a computer program (also referred to as code, or instructions) is stored. When the computer program runs on a computer, the computer executes the method in any one of the above aspects or any possible implementation of any one of the aspects.

[0078] In the eleventh aspect, a computer program product is provided, comprising: a computer program (also referred to as code, or instructions), which, when run on a computer, enables the computer to execute the method in any one of the above aspects or any possible implementation of any one of the aspects.

[0079] In the twelfth aspect, a chip is provided, comprising: a processor and a memory, wherein the memory is used to store a computer program (also referred to as code, or instruction), and the processor is used to call and run the computer program stored in the memory, so that a device or equipment equipped with the chip executes the method in any one of the above aspects or any possible implementation of any one of the aspects. BRIEF DESCRIPTION OF THE DRAWINGS

[0080] FIG1 is a schematic block diagram of a communication system applicable to the present application.

[0081] FIG2 is a schematic block diagram of the connection relationship between a terminal device and a network device in one embodiment of the present application.

[0082] FIG3 is a schematic diagram of time-frequency resources occupied by PBCH in one embodiment of the present application.

[0083] FIG4 is a schematic diagram of a narrowband terminal device receiving part of the PBCH in one embodiment of the present application.

[0084] FIG5 is a schematic diagram of a narrowband terminal device receiving part of the PBCH in another embodiment of the present application.

[0085] FIG6 is a schematic diagram showing a comparison of the reception performance of a narrowband terminal device receiving a partial PBCH and a wideband terminal device receiving a complete PBCH.

[0086] FIG7 is a schematic flowchart of a communication method provided in one embodiment of the present application.

[0087] FIG8 is a schematic flowchart of a communication method provided in another embodiment of the present application.

[0088] FIG9 is a schematic diagram of mapping modulation symbols to PBCH time-frequency resources in one embodiment of the present application.

[0089] FIG10 is a schematic structural diagram of a communication device provided in one embodiment of the present application.

[0090] FIG11 is a schematic structural diagram of a communication device provided in another embodiment of the present application.

[0091] FIG12 is a schematic structural diagram of a communication device provided in yet another embodiment of the present application.

[0092] FIG13 is a schematic structural diagram of a device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0093] The technical solutions in the embodiments of the present application will be described below in conjunction with the drawings in the embodiments of the present application.

[0094] In the description of this application, unless otherwise specified, " / " indicates that the objects associated with each other are in an "or" relationship. For example, A / B can mean A or B. "And / or" in this application is merely a description of the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. In addition, in the description of this application, unless otherwise specified, "multiple" means two or more than two. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple. In addition, to facilitate the clear description of the technical solutions of the embodiments of this application, in the embodiments of this application, words such as "first" and "second" are used to distinguish between identical or similar items with substantially the same functions and effects. Those skilled in the art will understand that words such as "first" and "second" do not limit the quantity or execution order, and words such as "first" and "second" do not necessarily limit differences. It should be understood that in this application, similar expressions such as "under the circumstances of...", "if...", "when...", and "if..." can be used interchangeably.

[0095] The technical solutions of the embodiments of the present application can be applied to various communication systems, such as: fifth generation (5G) system or new radio (NR), long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD) system, etc. The technical solutions provided by the present application can also be applied to future communication systems, such as the sixth generation mobile communication system, satellite communication system, etc.

[0096] Figure 1 is an exemplary architecture diagram of a communication system 100 applicable to embodiments of the present application. The methods in the embodiments of the present application can be applied to the communication system 100 shown in Figure 1. It should be understood that the communication system 100 to which the methods in the embodiments of the present application can be applied may include more or fewer network devices or terminal devices.

[0097] The network devices or terminal devices in Figure 1 can be hardware, functionally divided software, or a combination of the two. The network devices or terminal devices in Figure 1 can communicate with each other through other devices or network elements.

[0098] In the communication system 100 shown in FIG1 , a network device 110 and terminal devices 101 to 106 constitute a communication system 100. In the communication system 100, the network device 110 can send downlink data to the terminal devices 101 to 106. Of course, the terminal devices 101 to 106 can also send uplink data to the network device 110. It should be understood that the terminal devices 101 to 106 can be, for example, cellular phones, smart phones, laptops, handheld communication devices, handheld computing devices, satellite radios, global positioning systems, personal digital assistants (PDAs), and / or any other suitable devices for communicating on the wireless communication system 100.

[0099] The communication system 100 may be a Public Land Mobile Network (PLMN) network, a device-to-device (D2D) network, a machine-to-machine (M2M) network, an Internet of Things (IoT) network, or other networks.

[0100] In addition, the terminal devices 104 to 106 may also form a communication system in which the terminal device 105 may send downlink data to the terminal device 104 or the terminal device 106 , and correspondingly, the terminal device 104 or the terminal device 106 may also send uplink data to the terminal device 105 .

[0101] Figure 2 is a schematic block diagram illustrating the connection relationship between a terminal device and a network device in one embodiment of the present application. As shown in Figure 2, terminal device 210 can be connected to network device 220 via an air interface. In this embodiment of the present application, the terminal device may also include a relay device, and any device capable of data communication with a network device can be considered a terminal device.

[0102] The terminal device in the embodiment of the present application may refer to user equipment (UE), station, access terminal, user unit, user station, mobile station, mobile station (MS), remote station, remote terminal, mobile terminal (MT), user terminal, terminal, wireless communication device, user agent or user device, etc., and this is not limited in the embodiment of the present application. The terminal device in the embodiment of the present application may also be a mobile phone, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a large screen, a vehicle-mounted device, a wearable device, a terminal device in a 5G network or a terminal device in a future evolved public land mobile communication network (PLMN) (such as a 5G terminal device, a 5.5G terminal device, a 6G terminal device), etc., and this is not limited in the embodiment of the present application. The terminal device in the embodiments of the present application may also be a tablet computer (Pad), a laptop computer, a PDA, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self-driving, a wireless terminal in remote medical surgery, a wireless terminal in a smart grid, a wireless terminal in transportation safety, a wireless terminal in a smart city, a wireless terminal in a smart home, etc., and this is not limited in the embodiments of the present application.

[0103] In some embodiments, the terminal device can be configured to act as a base station. Optionally, the terminal device can act as a dispatching entity, providing sidelink signals between terminal devices in vehicle-to-everything (V2X) or device-to-device (D2D) communications. For example, a cell phone and a car can communicate using sidelink signals, or a cell phone and a smart home device can communicate using sidelink signals without relaying the communication signals through a base station.

[0104] The network device in the embodiment of the present application may refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network, and may also be referred to as a base station. For example, the network device may be a NodeB, an evolved NodeB (eNodeB), a next generation NodeB (gNB) in a 5G mobile communication system, a transmission reception point (TRP), an access point (AP), a base station in a future mobile communication system or an access point (AP) in a WiFi system, a wireless controller in a cloud radio access network (CRAN) scenario, a relay station, an access point, a vehicle-mounted device, a wearable device, a network device in other communication systems that will evolve in the future, and the like.

[0105] In some embodiments, multiple RAN nodes may collaborate to assist terminal devices in achieving wireless access, and different RAN nodes may respectively implement part of the functions of a base station. For example, a RAN node (i.e., a network device in this application) may be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU), etc. The CU and DU may be set separately, or may be included in the same network element, such as a baseband unit (BBU). The RU may be included in a radio frequency device or radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). In different systems, CU (or CU-CP and CU-UP), DU, or RU may also have different names, but those skilled in the art may understand their meanings. For example, in an open radio access network (ORAN) system, CU may also be referred to as an open CU (O-CU), DU may also be referred to as an open DU (O-DU), CU-CP may also be referred to as O-CU-CP, CU-UP may also be referred to as O-CU-UP, and RU may also be referred to as O-RU. Any unit of the CU (or CU-CP, CU-UP), DU and RU in this application may be implemented by a software module, a hardware module, or a combination of a software module and a hardware module. It should be understood that this application does not limit the specific technology and specific device form adopted by the network device.

[0106] In some embodiments, the network device may be fixed or mobile, which is not limited in the embodiments of the present application. For example, a helicopter or drone may be configured as a mobile network device, and one or more cells may be moved based on the location of the mobile network device. In other examples, a helicopter or drone may be configured to communicate with another network device.

[0107] In some embodiments, network devices may be deployed on land or in the air, which is not limited in the embodiments of the present application. For example, network devices may be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; on water; or in the air on aircraft, balloons, and satellites.

[0108] In an embodiment of the present application, a terminal device or a network device may include a hardware layer, an operating system layer running on the hardware layer, and an application layer running on the operating system layer. The hardware layer includes hardware such as a central processing unit (CPU), a memory management unit (MMU), and memory (also called main memory). The operating system may be any one or more computer operating systems that implement business processing through processes, such as a Linux operating system, a Unix operating system, an Android operating system, an iOS operating system, or a Windows operating system. The application layer includes applications such as a browser, an address book, a word processing software, and an instant messaging software. Furthermore, in the embodiment of the present application, the specific structure of the execution subject of the method provided in the embodiment of the present application is not particularly limited. As long as it is possible to communicate according to the method provided in the embodiment of the present application by running a program that records the code of the method provided in the embodiment of the present application, for example, the execution subject of the method provided in the embodiment of the present application may be a terminal device or a network device, or a functional module in the terminal device or the network device that can call a program and execute the program.

[0109] In addition, various aspects or features of the present application can be implemented as methods, devices or products using standard programming and / or engineering techniques. The term "product" as used in this application covers computer programs that can be accessed from any computer-readable device, carrier or medium. For example, computer-readable media may include, but are not limited to: magnetic storage devices (e.g., hard disks, floppy disks or magnetic tapes, etc.), optical disks (e.g., compact discs (CDs), digital versatile discs (DVDs), etc.), smart cards and flash memory devices (e.g., erasable programmable read-only memories (EPROMs), cards, sticks or key drives, etc.). In addition, the various storage media described herein may represent one or more devices and / or other machine-readable media for storing information. The term "machine-readable medium" may include, but is not limited to, wireless channels and various other media capable of storing, containing and / or carrying instructions and / or data.

[0110] With the advancement of communications technology, the IoT is becoming increasingly widely used. For example, it can be applied to smart grids, smart agriculture, smart transportation, smart homes, and environmental monitoring, among other areas. Because the IoT needs to be applied in a wide range of scenarios, from outdoor to indoor, aboveground to underground, it places many unique demands on IoT design. For example, a large number of low-speed machine-type communication (MTC) devices are required, far outnumbering those used for human-to-human communication. However, the data packets transmitted by MTC devices are very small and are not sensitive to latency. Furthermore, in most cases, MTC devices are battery-powered. However, in many scenarios, MTC devices are required to last for more than ten years without requiring battery replacement, requiring them to operate with extremely low power consumption.

[0111] As can be seen, the IoT requires low energy consumption and low costs for terminal devices. Based on this, narrow-bandwidth terminal devices (referred to as narrowband terminal devices) can be introduced into certain communication systems (such as NR systems, 5G evolution systems, 5.5G systems, or future 6G communication systems) to reduce energy consumption and costs. Therefore, a communication system may simultaneously contain terminal devices with multiple bandwidth types, such as broadband terminal devices (legacy terminal devices such as traditional LTE terminal devices or enhanced mobile broadband (eMBB) terminal devices) and narrowband terminal devices (such as narrowband Internet of Things (NB-IoT) terminal devices).

[0112] For narrowband terminal devices, the network can send dedicated synchronization signals and physical broadcast channels (PBCH) to them separately. This approach effectively ensures coverage of public signals and broadcast channels for narrowband terminal devices during initial access, but it significantly increases network overhead. Therefore, in future communication systems, the ideal solution will still be the integrated broadband and narrowband design principle, that is, sending a set of common signals that enable both broadband and narrowband terminal devices to synchronize access and obtain public (broadcast) channel information from this set of common signals, while also ensuring better performance for narrowband terminal access.

[0113] For example, taking the NR system as an example, the mapping rule of the symbol obtained after the PBCH coding modulation in the synchronization signal block (SSB) (the symbol can also be called the modulation symbol) on the time-frequency resources can follow the principle of "frequency domain first, then time domain", that is, on the time-domain orthogonal frequency division multiplexing (OFDM) symbol occupied by a certain PBCH, the symbols are mapped from low to high subcarrier numbers on the frequency domain resources of the PBCH on the current time-domain OFDM symbol. After the current time-domain OFDM symbol is mapped, the above operation is repeated on the OFDM symbol occupied by the next PBCH, and the symbols are mapped from low to high subcarrier numbers on the frequency domain resources of the PBCH on the time-domain OFDM symbol. According to this resource mapping rule, the entire resource mapping process ends until all PBCH time-frequency domain resources are mapped.

[0114] For the SS / PBCH structure in the NR system, the primary synchronization signal (PSS), secondary synchronization signal (SSS), PBCH, and PBCH demodulation reference signal (DMRS) can be mapped under the defined time domain OFDM symbol and frequency domain subcarrier number. The specific mapping method is shown in Table 1 below (as shown in Table 7.4.3.1-1 in protocol TS 38.211):

[0115] Table 1 Time-frequency resource mapping method

[0116] As can be seen from Table 1 above, the PBCH (or PBCH time-frequency resources) in the NR system occupies 3 OFDM symbols in the time domain. In the first and third OFDM symbols, it occupies a total of 240 subcarriers in the frequency domain, with the occupied subcarrier numbers being 0, 1, 2, .., 239. In the second OFDM symbol, it occupies a total of 96 subcarriers in the frequency domain, with the occupied subcarrier numbers being 0, 1, 2, .., 47 and 192, 193, .., 239. The DMRS (in the PBCH) occupies subcarrier numbers 0+v, 4+v, 8+v, .., 236+v in the frequency domain in the first and third OFDM symbols. In the second OFDM symbol, it occupies subcarrier numbers 192+v, 196+v, 8+v, .., 236+v in the frequency domain, where v is an integer. The PBCH after time-frequency resource mapping may be as shown in FIG3 .

[0117] However, the above PBCH mapping method only considers the access of broadband terminal devices, and does not take into account the access of narrowband terminal devices (for example, narrowband terminal devices can refer to terminal devices with a maximum receiving bandwidth smaller than the bandwidth of the existing PBCH). When a narrowband terminal device receives a PBCH (such as the existing PBCH), it must perform narrowband reception and access from a portion of the PBCH. The other parts of the PBCH that the narrowband terminal device cannot receive are equivalent to being punctured. This will cause the performance of narrowband terminal devices in detecting broadcast channels to deteriorate significantly.

[0118] For example, when the subcarrier spacing is 30kHz, the bandwidth occupied by PBCH is 7.2MHz. At this time, if there is a terminal device with a bandwidth of 3MHz (such as the maximum receiving bandwidth is 3MHz) in the network (radio frequency (RF) and baseband (BB) are both 3MHz), then the terminal device can only receive part of the PBCH. Assuming that the terminal device with a bandwidth of 3MHz needs to access the network, the terminal device with a bandwidth of 3MHz can receive 72 subcarriers in the PBCH (occupying 6 resource blocks (RB) / bandwidth 4.32MHz). The receiving methods may include: receiving part of the PBCH of the low-frequency (or high-frequency) edge 6RBs, or receiving part of the PBCH of the center 6RBs.

[0119] For example, as shown in FIG4 , a narrowband terminal device can receive part of the PBCH of the low-frequency edge 6 RBs (including 72 subcarriers), and the rest of the PBCH is punctured; as shown in FIG5 , a narrowband terminal device can also receive part of the PBCH of the center 6 RBs (including 72 subcarriers), and the rest of the PBCH is punctured.

[0120] Figure 6 shows a comparison of the reception performance of a narrowband terminal device receiving a partial PBCH and a wideband terminal device receiving a complete PBCH. In Figure 6, a subcarrier spacing of 30 kHz, a PBCH bandwidth of 7.2 MHz, and a narrowband terminal device bandwidth of 3 MHz are used as an example.

[0121] As shown in Figure 6, the broken line 610 represents the actual reception performance of the complete PBCH received by a broadband terminal device (such as a legacy terminal device), the broken line 620 represents the theoretical reception performance of 6RBs received by a narrowband terminal device, the broken line 630 represents the actual reception performance of the low-frequency 6RBs received by the narrowband terminal device (as shown in Figure 4), and the broken line 640 represents the actual reception performance of the center 6RBs received by the narrowband terminal device (as shown in Figure 5).

[0122] As can be seen from the broken line 640 in Figure 6, when a narrowband terminal device receives the central 6RBs (including 72 subcarriers), the block error rate (BLER) performance of the PBCH is always 1 in any signal-to-noise ratio (SNR) operating point range. In other words, the PBCH receiving the central 72 subcarriers cannot work properly for a terminal device with a bandwidth of 3MHz.

[0123] As can be seen from the broken line 630 in FIG6 , when the narrowband terminal device receives 72 subcarriers at the low-frequency edge, the PBCH achieves a BLER performance of 10 -2 The SNR operating point is about 16.0dB, but in fact, when a terminal device with a bandwidth of 3MHz receives 72 subcarriers at the low-frequency edge, the total time-frequency resources of the received part of the PBCH are a total of 192 resource units (RE) information (excluding the DMRS symbols occupying 1 / 3 of the REs, there are a total of 144 REs carrying PBCH symbols, a total of 288 bits of coding bits, PBCH uses quadrature phase shift keying (QPSK) modulation, at this time, 2 bits are mapped to 1 symbol).

[0124] As can be seen from the broken line 610 in FIG6 , when the broadband terminal device receives the complete PBCH, the PBCH has a BLER performance of 10 -2 When the SNR operating point is about 1.8dB, the time-frequency resources of the received complete PBCH are the information of 576 REs (excluding the DMRS symbols occupying 1 / 3 of the REs, there are a total of 432 REs carrying PBCH symbols, a total of 864 bits of coded bits, and PBCH uses QPSK modulation. At this time, 2 bits are mapped to 1 symbol).

[0125] However, from the perspective of the loss of time-frequency resources received by the narrowband terminal device, 1 / 3 of the coding information is lost. That is to say, the ideal reception performance difference between the narrowband terminal device receiving partial PBCH and the broadband terminal device receiving the complete PBCH should be about 4.7dB (as shown by the broken line 610 and the broken line 620). However, the current actual reception performance difference is about 14.2dB (as shown by the broken line 610 and the broken line 630).

[0126] Therefore, based on the above-mentioned PBCH coding and time-frequency resource mapping method, the performance of narrowband terminal equipment in detecting the broadcast channel will be greatly deteriorated.

[0127] In order to solve one or more of the above technical problems, the present application proposes a communication method and a communication device, which can improve the communication effect of narrowband terminal equipment. The communication method in the embodiment of the present application is described in detail with reference to FIG7 .

[0128] FIG7 is a schematic flow chart of a communication method provided by an embodiment of the present application. The method 700 shown in FIG7 may include step S710, which may be performed by a network device, such as the network device 110 in FIG1 and the network device 220 in FIG2. Step S710 in the method 700 may be specifically as follows:

[0129] S710: The network device obtains M symbols of the PBCH, where M is a positive integer greater than 1.

[0130] The M symbols may be obtained by coding and modulating the PBCH.

[0131] In some embodiments, M symbols may be mapped to PBCH time-frequency resources, where the PBCH time-frequency resources may be understood as time-frequency resources occupied by the PBCH, or may also be understood as time-frequency resources used to transmit the PBCH.

[0132] In some embodiments, the PBCH time-frequency resources may include a first time-frequency resource and a second time-frequency resource.M symbols may be mapped to the PBCH time-frequency resources.

[0133] Optionally, the subcarriers occupied by the first time-frequency resource and the second time-frequency resource may not overlap.

[0134] Optionally, the subcarriers occupied by the first time-frequency resources may be continuous in the frequency domain.

[0135] Optionally, the union of the OFDM symbols occupied by the first time-frequency resource and the second time-frequency resource may be the OFDM symbols occupied by the PBCH time-frequency resource. Optionally, the OFDM symbols occupied by the first time-frequency resource and the second time-frequency resource in the time domain may be the same, or the OFDM symbols occupied by the first time-frequency resource and the second time-frequency resource in the time domain may be different. The following description, in conjunction with FIG9 , takes the case where the first time-frequency resource and the second time-frequency resource occupy the same OFDM symbols in the time domain as an example.

[0136] For example, as shown in Figure 9, PBCH#1 occupies the time-frequency resources corresponding to the diagonal area in Figure 9, that is, PBCH#1 (or the time-frequency resources occupied by PBCH#1 or PBCH#1 time-frequency resources) occupies 3 OFDM symbols in the time domain, and in the first and third OFDM symbols, occupies 240 subcarriers with subcarrier numbers 0, 1, 2, .., 239 in the frequency domain, and in the second OFDM symbol, occupies 96 subcarriers with subcarrier numbers 0, 1, 2, .., 47 and 192, 193,…, 239 in the frequency domain.

[0137] In the first and third OFDM symbols, the first time-frequency resource can occupy 72 subcarriers with subcarrier numbers 0, 1, 2, .., 71 in the frequency domain, that is, 6RBs at the low-frequency edge. In the second OFDM symbol, the first time-frequency resource can occupy 48 subcarriers with subcarrier numbers 0, 1, 2, .., 47 in the frequency domain, that is, 4RBs at the low-frequency edge.

[0138] Optionally, the first time-frequency resource may be an effective RE in the above time-frequency resource (i.e., 6 RBs on the first and third OFDM symbols and 4 RBs on the second OFDM symbol). The effective RE here may refer to the RE in the above time-frequency resource excluding the RE used for mapping the DMRS. Alternatively, the effective RE here may also refer to the RE in the above time-frequency resource excluding the RE used for mapping the reference signal.

[0139] In the first and third OFDM symbols, the second time-frequency resources can occupy 168 subcarriers with subcarrier numbers 72, 73, .., 239 in the frequency domain, that is, 14RBs in the first and third OFDM symbols except the first time-frequency resources. In the second OFDM symbol, the second time-frequency resources can occupy 48 subcarriers with subcarrier numbers 192, 193, …, 239 in the frequency domain, that is, 4RBs in the second OFDM symbol except the first time-frequency resources.

[0140] Optionally, the second time-frequency resource may also be a valid RE in the above time-frequency resources (ie, 14 RBs on the first and third OFDM symbols and 4 RBs on the second OFDM symbol).

[0141] It can be seen that in PBCH#1 shown in FIG9 , the time domain symbols occupied by the first time-frequency resource and the second time-frequency resource in the time domain may be the same.

[0142] In some embodiments, when M symbols are sent on the PBCH time-frequency resources, the M symbols may be mapped to the PBCH time-frequency resources.

[0143] Optionally, M1 consecutive symbols among the M symbols can be mapped to the first time-frequency resource in the PBCH time-frequency resources, the M1 symbols can be symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, and the remaining M-M1 symbols among the M symbols can be mapped to the second time-frequency resource in the PBCH time-frequency resources, where M1 is a positive integer greater than 1.

[0144] Wherein, Q may be the modulation order of the PBCH, and N may be the coded bit sequence (e.g., the coded bit sequence length) of the channel coding of the PBCH. Q and N are positive integers. For example, when the PBCH is modulated using QPSK, the modulation order Q of the PBCH may be 2. Wherein, N may be 2 raised to the power of L, where the value of L is predefined or calculated according to a predefined formula. For example, N may be equal to 512 or 256.

[0145] In an embodiment of the present application, M1 consecutive symbols among M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource. In this way, when the first terminal device (such as a narrowband terminal device) receives PBCH on the first time-frequency resource, it can receive M1 consecutive symbols. Therefore, the detection performance of the first terminal device receiving PBCH can be improved, thereby improving the communication effect of the first terminal device.

[0146] At the same time, the remaining M-M1 symbols of the M symbols are mapped to the second time-frequency resources in the PBCH time-frequency resources. The subcarriers occupied by the first time-frequency resources and the second time-frequency resources do not overlap. In this way, although the mapping method of the symbols is changed, when the second terminal device (such as a broadband terminal device) receives PBCH on the PBCH time-frequency resources, it can still receive all M symbols, and will not affect the detection performance of the second terminal device receiving PBCH.

[0147] Furthermore, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0148] In some embodiments, the number of valid REs in the first time-frequency resource may be M1. The valid REs in the first time-frequency resource may be REs other than REs used for mapping DMRS in the first time-frequency resource.

[0149] In some embodiments, M1 consecutive symbols may be mapped to the first time-frequency resource according to a first mapping order, and the remaining M-M1 symbols of the M symbols may be mapped to the second time-frequency resource according to the first order.

[0150] The first mapping order may include: first, subcarrier index (such as subcarrier sequence number) from low to high, and then time domain symbol index (such as OFDM symbol sequence number) from low to high.

[0151] For example, as shown in Figure 9, for the first time-frequency resource in PBCH#1, starting from the first symbol of M1 consecutive symbols, according to the subcarrier number from small to large (that is, the three OFDM symbols occupied by PBCH#1 all start from the subcarrier with subcarrier number 0), first map the valid RE on the first OFDM symbol, then map the valid RE on the second OFDM symbol, and finally map the valid RE on the first OFDM symbol, so that M1 consecutive symbols are mapped to the first time-frequency resource.

[0152] For the second time-frequency resource in PBCH#1, starting from the first symbol of M-M1 consecutive symbols (i.e., the remaining M-M1 symbols in the M symbols), according to the subcarrier number from small to large (i.e., starting from the subcarrier number 72 on the first and third OFDM symbols, and starting from the subcarrier number 192 on the second OFDM symbol), first map the valid RE on the first OFDM symbol, then map the valid RE on the second OFDM symbol, and finally map the valid RE on the first OFDM symbol, and map the M1 consecutive symbols to the first time-frequency resource.

[0153] In some embodiments, the first time-frequency resource may be a common PBCH time-frequency resource of the first terminal device and the second terminal device, and the second time-frequency resource may be a dedicated PBCH time-frequency resource of the second terminal device relative to the first terminal device.

[0154] The public PBCH time-frequency resources mentioned here can be understood as: the symbols sent to the first terminal device and the symbols sent to the second terminal device can both be mapped to the first time-frequency resources, or in other words, the first terminal device and the second terminal device can both receive symbols through the first time-frequency resources.

[0155] The dedicated PBCH time-frequency resources mentioned here can be understood as: symbols to the second terminal device can be mapped to the second time-frequency resources, while symbols to the first terminal device cannot be mapped to the second time-frequency resources, or in other words, the second terminal device can receive symbols through the second time-frequency resources, while the first terminal device cannot receive symbols through the second time-frequency resources.

[0156] In some embodiments, the bandwidth of the first time-frequency resource may be less than or equal to the maximum receiving bandwidth of the first terminal device. Optionally, the first terminal device may be a narrowband terminal device. For example, the first terminal device may be a 3 MHz or 5 MHz terminal device, or a terminal device with both a radio frequency (RF) and a baseband (BB) bandwidth of 3 MHz or 5 MHz.

[0157] In some embodiments, the bandwidth of the PBCH time-frequency resource may be greater than the maximum receiving bandwidth of the first terminal device and less than or equal to the maximum receiving bandwidth of the second terminal device. Optionally, the maximum receiving bandwidth of the second terminal device may be greater than the maximum receiving bandwidth of the first terminal device. Optionally, the second terminal device may be a broadband terminal device (or a terminal device with normal bandwidth). For example, the second terminal device may be a broadband terminal device such as an LTE terminal device, an NR terminal device, or a 6G terminal device.

[0158] In some embodiments, the network device may send M symbols to the terminal device. For example, the method 700 may further include step S720, which is as follows:

[0159] S720: The network device sends M symbols on the PBCH time-frequency resources.

[0160] In some embodiments, the first terminal device may receive the symbol sent by the network device through the above method. For example, the method 700 may further include step S730, which is as follows:

[0161] S730, the first terminal device receives M1 symbols of the PBCH on the first time-frequency resource in the PBCH time-frequency resources.

[0162] That is to say, the first terminal device can only receive symbols sent by the network device on the public PBCH time-frequency resources (ie, the first time-frequency resources) in the PBCH time-frequency resources.

[0163] In an embodiment of the present application, M1 consecutive symbols among M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource. In this way, when the first terminal device (such as a narrowband terminal device) receives PBCH on the first time-frequency resource, it can receive M1 consecutive symbols. Therefore, the detection performance of the first terminal device receiving PBCH can be improved, thereby improving the communication effect of the first terminal device.

[0164] At the same time, M1 consecutive symbols among the M symbols are: symbols with symbol indexes of N / Q-M1 to N / Q-1 among the M symbols. In this way, when the first terminal device receives M1 consecutive symbols of PBCH on the first time-frequency resource, the detection performance of the first terminal device receiving PBCH can be further improved, thereby further improving the communication effect of the first terminal device.

[0165] In some embodiments, the second terminal device may receive the symbol sent by the network device through the above method. For example, the method 700 may further include step S740, which is as follows:

[0166] S740, the second terminal device receives M symbols of PBCH on the PBCH time-frequency resources.

[0167] For example, the second terminal device can receive M1 consecutive symbols out of M symbols on the first time-frequency resource in the PBCH time-frequency resource, and the second terminal device can also receive the remaining M-M1 symbols out of M symbols on the second time-frequency resource in the PBCH time-frequency resource.

[0168] That is to say, the second terminal device can receive symbols sent by the network device on the public PBCH time-frequency resources (i.e., the first time-frequency resources) in the PBCH time-frequency resources, or receive symbols sent by the network device on the dedicated PBCH time-frequency resources (i.e., the second time-frequency resources) in the PBCH time-frequency resources.

[0169] In an embodiment of the present application, M1 consecutive symbols among the M symbols are mapped to the first time-frequency resource in the PBCH time-frequency resource, and the remaining M-M1 symbols among the M symbols are mapped to the second time-frequency resource in the PBCH time-frequency resource. The subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap. In this way, although the mapping method of the symbols is changed, when the second terminal device (such as a broadband terminal device) receives PBCH on the PBCH time-frequency resource, all M symbols can still be received, and the detection performance of the second terminal device receiving PBCH will not be affected.

[0170] Below, in conjunction with Figure 8, taking the subcarrier spacing as 30kHz, the bandwidth occupied by PBCH as 7.2MHz, the terminal equipment with a bandwidth of 3MHz in the network (that is, the terminal equipment with RF and BB both being 3MHz), and the use of QPSK to modulate PBCH (that is, the modulation order Q of PBCH can be 2) as an example, the method in the embodiment of the present application is illustrated.

[0171] FIG8 is a schematic flow chart of a communication method provided by another embodiment of the present application. The method 800 shown in FIG8 may include steps S810 to S850, which are specifically as follows:

[0172] S810: Divide the PBCH time-frequency resources into time-frequency resource regions.

[0173] The PBCH time-frequency resources can be divided into first time-frequency resources and second time-frequency resources, and the number of REs contained in the PBCH time-frequency resources can be defined as E / 2 (i.e., M in the above embodiment); the number of REs contained in the first time-frequency resources can be defined as E1 / 2 (i.e., M1 in the above embodiment); the number of REs contained in the second time-frequency resources can be defined as (E-E1) / 2 (i.e., M-M1 in the above embodiment).

[0174] In the PBCH time-frequency resources, the first time-frequency resources may include time-frequency resources (k0~k1,l), and the second time-frequency resources may include time-frequency resources (k1~k2,l). The value ranges of subcarriers occupied by (k0~k1,l) and (k1~k2,l) in the frequency domain are different, and the value ranges of OFDM symbols occupied in the time domain are the same.

[0175] Here, (k0-k1, l) may represent the time-frequency resources of subcarrier numbers k0-k1 on the lth OFDM symbol, and (k1-k2, l) may represent the time-frequency resources of subcarrier numbers k1-k2 on the lth OFDM symbol. The meaning of the time-frequency resources expressed in this form in subsequent embodiments is similar and will not be repeated here.

[0176] For example, as shown in FIG9 , the PBCH time-frequency resources (i.e., PBCH#1 time-frequency resources) may include REs in (0-239, 1), (0-47, 2), (192-239, 2), and (0-239, 3) excluding REs used for DMRS. The number of REs included in the PBCH time-frequency resources is 432, i.e., E=864 here.

[0177] Among them, the first time-frequency resources can include REs other than REs used for DMRS in (0~71,1), (0~47,2) and (0~71,3), and the number of REs included is 144, that is, E1=288 here; the second time-frequency resources are REs other than REs used for DMRS in (72~239,1), (192~239,2) and (72~239,3), and the number of REs included is 288, that is, (E-E1) / 2=288 here.

[0178] S820: Determine the coded bit sequence length of the PBCH.

[0179] PBCH coding bit length is N=2 n , in calculating the length of the coded bit sequence 2 n When the value of n is set, the value of the rate matching output sequence length can be twice the number of REs included in the PBCH resource.

[0180] For example, the number of REs included in the PBCH time-frequency resource is 432. n When the value of n is substituted, the value of the rate matching output length can be twice the number of REs contained in the PBCH resource, that is, 864.

[0181] The value of n can be calculated according to the following steps (in the following steps, K represents the original PBCH coded bits, K=56):

[0182] (1) If And K / E<9 / 16, then otherwise

[0183] Here, n1=9 can be obtained through step (1).

[0184] (2)R min =1 / 8, then

[0185] Here, n2=9 can be obtained through step (2).

[0186] (3) For PBCH, n max =9,n min =5, the value of n is n=max{min{n1,n2,n max},n min}.

[0187] Here, through step (2), we can get n=9, and we can determine that the PBCH coding bit sequence length N is 2 9 =512.

[0188] S830: Perform sub-block interleaving and rate matching on the coded bit sequence.

[0189] The sequence of the coded bit sequence after sub-block interleaving is y0,y1,…,y N , the rate matching sequence length is E; at this time, E>N, and the repetition branch is taken.

[0190] For i=0 to E-1, the output bit sequence element is f i =y mod(i,N) , therefore, we can get the rate matching output sequence f: f0,f1,f2,…,f E-1 .

[0191] For example, the first 352 bits of the coded bit sequence (length 512 bits) can be taken and concatenated to the end of the coded bit sequence to obtain a rate matching output sequence f with a length of 864 bits: f0,f1,f2,…,f 863 .

[0192] S840: Perform scrambling, modulation, and time-frequency resource mapping on the rate matching output sequence.

[0193] The PBCH modulation symbol (i.e., the symbol obtained by coding and modulating the PBCH) output after scrambling and QPSK modulation of the rate matching output sequence f can be defined as d PBCH (0),…,d PBCH (E1 / 2-1).

[0194] The PBCH modulation symbols obtained after scrambling and modulation can be E1 / 2 PBCH modulation symbols with symbol indexes from N / 2-E1 / 2 to N / 2-1. PBCH (N / 2-E1 / 2),…,d PBCH (N / 2-1) is mapped to the first time-frequency resource, and the remaining (E-E1) / 2 PBCH modulation symbols d PBCH (0),…,d PBCH (N / 2-E1 / 2-1) and d PBCH (N / 2),…,d PBCH (E / 2-1) is mapped to the second time-frequency resource.

[0195] The mapping order is the first mapping order in the aforementioned embodiment, that is, mapping is performed in the order of first frequency domain subcarrier index from small to large, and then time domain symbol index from small to large.

[0196] For example, the PBCH modulation symbol output after scrambling and QPSK modulation of the rate matching output sequence f can be defined as d PBCH (0),…,d PBCH (431), as shown in Figure 9, the symbol index is d PBCH (112),…,d PBCH The PBCH modulation symbol of (255) is mapped to the first time-frequency resource, and the symbol index is d PBCH (0),…,d PBCH (111) and d PBCH (256),…,d PBCH The PBCH modulation symbol of (431) is mapped to the second time-frequency resource. The mapping order can be based on the order of frequency domain subcarrier index from small to large and time domain symbol index from small to large.

[0197] The first time-frequency resource may include REs in (0-71, 1), (0-47, 2), and (0-71, 3) excluding REs used for DMRS, and the second time-frequency resource may include REs in (72-239, 1), (192-239, 2), and (72-239, 3) excluding REs used for DMRS. The subcarrier index may refer to an index relative to the frequency domain starting position of the SS / PBCH, and the OFDM symbol index may refer to a symbol index relative to the time domain starting position of the SS / PBCH.

[0198] S850: Send modulation symbols on the PBCH time-frequency resources.

[0199] The method embodiment of the present application is described in detail above in conjunction with Figures 1 to 9 . The device embodiment of the present application is described in detail below in conjunction with Figures 10 to 13 . It should be understood that the description of the method embodiment corresponds to the description of the device embodiment. Therefore, for portions not described in detail, reference can be made to the above method embodiment.

[0200] FIG10 is a schematic structural diagram of a communication device provided in an embodiment of the present application. As shown in FIG10 , the device 1000 includes an acquisition unit 1010, which is specifically as follows:

[0201] The acquisition unit 1010 is used to acquire M symbols of a physical broadcast channel PBCH, where the M symbols are mapped to PBCH time-frequency resources, and the PBCH time-frequency resources include a first time-frequency resource and a second time-frequency resource, and the subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; wherein, M1 symbols among the M symbols are mapped to the first time-frequency resource, and the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, where N is a coded bit sequence of the PBCH channel coding, and Q is a modulation order of the PBCH, where Q and N are positive integers, and where the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and where M and M1 are positive integers greater than 1.

[0202] Optionally, the first time-frequency resource is a common PBCH time-frequency resource of the first terminal device and the second terminal device, and the second time-frequency resource is a dedicated PBCH time-frequency resource of the second terminal device relative to the first terminal device.

[0203] Optionally, the bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device, and less than or equal to the maximum receiving bandwidth of the second terminal device.

[0204] Optionally, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0205] Optionally, the union of the orthogonal frequency division multiplexing OFDM symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

[0206] Optionally, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0207] Optionally, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

[0208] Optionally, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0209] FIG11 is a schematic structural diagram of a communication device provided in an embodiment of the present application. As shown in FIG11 , the device 1100 includes a receiving unit 1110, which is specifically as follows:

[0210] The receiving unit 1110 is used to receive M1 symbols of the physical broadcast channel (PBCH) on the first time-frequency resource in the PBCH time-frequency resource, where the M1 symbols are M1 consecutive symbols among the M symbols of the PBCH, and the M1 symbols are mapped to the first time-frequency resource, where the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, where N is a coded bit sequence of the PBCH channel coding, and Q is a modulation order of the PBCH. Q and N are positive integers, and M and M1 are positive integers greater than 1.

[0211] Optionally, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0212] Optionally, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0213] Optionally, the M1 consecutive symbols are mapped to the first time-frequency resources in a first mapping order.

[0214] Optionally, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0215] FIG12 is a schematic structural diagram of a communication device provided in an embodiment of the present application. As shown in FIG12 , the device 1200 includes a receiving unit 1210, which is specifically as follows:

[0216] The receiving unit 1210 is used to receive M symbols of the physical broadcast channel (PBCH) on the PBCH time-frequency resources, where the M symbols are mapped to the PBCH time-frequency resources, and the PBCH time-frequency resources include a first time-frequency resource and a second time-frequency resource, and the subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; wherein, M1 symbols of the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is a coded bit sequence of the PBCH channel coding, Q is a modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

[0217] Optionally, the receiving unit 1210 is specifically configured to:

[0218] Receiving M1 consecutive symbols of the M symbols on the first time-frequency resource in the PBCH time-frequency resource;

[0219] The remaining M-M1 symbols are received on the second time-frequency resource in the PBCH time-frequency resource.

[0220] Optionally, the first time-frequency resource is a common PBCH time-frequency resource of the first terminal device and the second terminal device.

[0221] Optionally, the bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device, and less than or equal to the maximum receiving bandwidth of the second terminal device.

[0222] Optionally, the subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

[0223] Optionally, the union of the orthogonal frequency division multiplexing OFDM symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

[0224] Optionally, the M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used to map the demodulation reference signal DMRS.

[0225] Optionally, the M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

[0226] Optionally, the first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

[0227] FIG13 is a schematic block diagram of an apparatus according to an embodiment of the present application. The dashed lines in FIG13 indicate that the unit or module is optional. Apparatus 1300 may be used to implement the method described in the above method embodiment. Apparatus 1300 may be a chip or a communication device.

[0228] The device 1300 may include one or more processors 1310. The processor 1310 may support the device 1300 to implement the method described in the above method embodiment. The processor 1310 may be a general-purpose processor or a special-purpose processor. For example, the processor may be a central processing unit (CPU). Alternatively, the processor may be another general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field programmable gate array (FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, etc. The general-purpose processor may be a microprocessor or the processor may be any conventional processor, etc.

[0229] The apparatus 1300 may further include one or more memories 1320. The memories 1320 store programs that can be executed by the processor 1310, causing the processor 1310 to perform the methods described in the above method embodiments. The memories 1320 may be independent of the processor 1310 or integrated into the processor 1310.

[0230] The apparatus 1300 may further include a transceiver 1330. The processor 1310 may communicate with other devices or chips via the transceiver 1330. For example, the processor 1310 may transmit and receive data with other devices or chips via the transceiver 1330.

[0231] It should be noted that the information interaction, execution process, etc. between the above-mentioned devices / units are based on the same concept as the method embodiment of this application. Their specific functions and technical effects can be found in the method embodiment section and will not be repeated here.

[0232] Those skilled in the art can clearly understand that, for the convenience and brevity of description, only the division of the above-mentioned functional units and modules is used as an example for illustration. In actual applications, the above-mentioned functions can be distributed and completed by different functional units and modules as needed, that is, the internal structure of the device can be divided into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiment can be integrated into one processing unit, or each unit can exist physically alone, or two or more units can be integrated into one unit. The above-mentioned integrated unit can be implemented in the form of hardware or in the form of software functional units. In addition, the specific names of the functional units and modules are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of this application. The specific working process of the units and modules in the above-mentioned system can refer to the corresponding process in the aforementioned method embodiment, and will not be repeated here.

[0233] An embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program. When the computer program is executed by a computer, the computer implements the steps in the above-mentioned various method embodiments.

[0234] An embodiment of the present application provides a computer program product. When the computer program product is run on an electronic device (such as a server or a terminal device), the electronic device implements the steps in the above-mentioned various method embodiments.

[0235] An embodiment of the present application provides a chip, which includes a processor and a memory, wherein the memory is used to store computer programs, and the processor is used to call and run the computer programs stored in the memory, so that an electronic device (such as a server or terminal device) equipped with the chip executes the steps in the above-mentioned method embodiments.

[0236] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present application implements all or part of the processes in the above-mentioned embodiment method, which can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and when the computer program is executed by the processor, it can implement the steps of the above-mentioned various method embodiments. Wherein, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable storage medium may at least include: any entity or device that can carry the computer program code to the device / electronic device, a recording medium, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electric carrier signal, a telecommunication signal and a software distribution medium. For example, a USB flash drive, a mobile hard disk, a magnetic disk or an optical disk. In some jurisdictions, according to legislation and patent practice, a computer-readable storage medium cannot be an electric carrier signal or a telecommunication signal.

[0237] In the above embodiments, the description of each embodiment has its own focus. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant description of other embodiments.

[0238] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0239] In the embodiments provided in the present application, it should be understood that the disclosed devices / electronic devices and methods can be implemented in other ways. For example, the device / electronic device embodiments described above are merely schematic. For example, the division of the modules or units is merely a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0240] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0241] The above-described embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present application, and should all be included in the scope of protection of the present application.

Claims

1. A communication method, characterized in that: include: Acquire M symbols of a physical broadcast channel (PBCH), where the M symbols are mapped to PBCH time-frequency resources, where the PBCH time-frequency resources include a first time-frequency resource and a second time-frequency resource, and subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; Among them, M1 symbols among the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is the coded bit sequence of the PBCH channel coding, Q is the modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

2. The method according to claim 1, characterized in that The first time-frequency resource is a common PBCH time-frequency resource of the first terminal device and the second terminal device, and the second time-frequency resource is a dedicated PBCH time-frequency resource of the second terminal device relative to the first terminal device.

3. The method according to claim 1 or 2, characterized in that The bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device and less than or equal to the maximum receiving bandwidth of the second terminal device.

4. The method according to any one of claims 1 to 3, characterized in that The subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

5. The method according to any one of claims 1 to 4, characterized in that The union of the orthogonal frequency division multiplexing OFDM symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

6. The method according to any one of claims 1 to 5, characterized in that The M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used for mapping the demodulation reference signal DMRS.

7. The method according to any one of claims 1 to 6, characterized in that The M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

8. The method according to claim 7, characterized in that The first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

9. A communication method, characterized in that: The method comprises: Receive M1 symbols of the physical broadcast channel (PBCH) on the first time-frequency resource in the PBCH time-frequency resources, where the M1 symbols are M1 consecutive symbols among the M symbols of the PBCH, and the M1 symbols are mapped to the first time-frequency resource, where the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, where N is a coded bit sequence of the PBCH channel coding, and Q is a modulation order of the PBCH. Q and N are positive integers, and M and M1 are positive integers greater than 1.

10. The method according to claim 9, characterized in that The subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

11. The method according to claim 9 or 10, characterized in that The M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used for mapping the demodulation reference signal DMRS.

12. The method according to any one of claims 9 to 11, characterized in that The M1 consecutive symbols are mapped to the first time-frequency resource in a first mapping order.

13. The method according to claim 12, characterized in that The first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

14. A communication method, characterized in that: The method comprises: Receiving M symbols of a physical broadcast channel (PBCH) on a PBCH time-frequency resource, where the M symbols are mapped to the PBCH time-frequency resource, where the PBCH time-frequency resource includes a first time-frequency resource and a second time-frequency resource, where subcarriers occupied by the first time-frequency resource and the second time-frequency resource do not overlap; Among them, M1 symbols among the M symbols are mapped to the first time-frequency resource, the M1 symbols are symbols indexed from N / Q-M1 to N / Q-1 among the M symbols, N is the coded bit sequence of the PBCH channel coding, Q is the modulation order of the PBCH, Q and N are positive integers, and the M symbols excluding the M1 symbols are mapped to the second time-frequency resource, and M and M1 are positive integers greater than 1.

15. The method according to claim 14, characterized in that The receiving M symbols of a physical broadcast channel (PBCH) on a PBCH time-frequency resource includes: Receiving M1 consecutive symbols of the M symbols on the first time-frequency resource in the PBCH time-frequency resource; The remaining M-M1 symbols are received on the second time-frequency resource in the PBCH time-frequency resource.

16. The method according to claim 14 or 15, characterized in that The first time-frequency resource is a common PBCH time-frequency resource of the first terminal device and the second terminal device.

17. The method according to any one of claims 14 to 16, characterized in that The bandwidth of the first time-frequency resource is less than or equal to the maximum receiving bandwidth of the first terminal device; the bandwidth of the PBCH time-frequency resource is greater than the maximum receiving bandwidth of the first terminal device and less than or equal to the maximum receiving bandwidth of the second terminal device.

18. The method according to any one of claims 14 to 17, characterized in that The subcarriers occupied by the first time-frequency resources are continuous in the frequency domain.

19. The method according to any one of claims 14 to 18, characterized in that The union of the orthogonal frequency division multiplexing OFDM symbols occupied by the first time-frequency resources and the second time-frequency resources is the OFDM symbol occupied by the PBCH time-frequency resources.

20. The method according to any one of claims 14 to 19, characterized in that The M1 is the number of valid resource elements RE in the first time-frequency resource, and the valid RE is the RE in the first time-frequency resource except the RE used for mapping the demodulation reference signal DMRS.

21. The method according to any one of claims 14 to 20, characterized in that The M1 consecutive symbols are mapped to the first time-frequency resources according to a first mapping order, and the remaining M-M1 symbols are mapped to the second time-frequency resources according to the first order.

22. The method according to claim 21, characterized in that The first mapping order includes: first, subcarrier index from low to high, and then time domain symbol index from low to high.

23. A communication device, characterized in that: include: A module or unit for performing the method according to any one of claims 1 to 22.

24. A communication device, characterized in that: include: A processor and a memory, the processor being coupled to the memory, the memory being used to store a computer program, wherein when the computer program is executed by the processor, the apparatus performs the method according to any one of claims 1 to 22.

25. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed on a computer, causes the computer to execute the method according to any one of claims 1 to 22.

26. A computer program product, characterized in that include: A computer program, which, when run on a computer, causes the computer to perform the method according to any one of claims 1 to 22.

27. A chip, characterized in that: include: A processor and a memory, the memory being used to store a computer program, the processor being used to call and run the computer program stored in the memory, so that a device or apparatus equipped with the chip executes the method as claimed in any one of claims 1 to 22.

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