Communication method, communication device, chip, computer readable storage medium, and computer program product

Abstract

Disclosed in embodiments of the present application are a communication method, a communication device, a chip, a computer readable storage medium, and a computer program product. The method comprises: sending first information, wherein the first information is used for indicating a frequency domain resource used by a first terminal device for transmission, the first information comprises one or more of first frequency domain information, second frequency domain information and third frequency domain information, the first frequency domain information is used for determining the frequency domain position or center frequency point of a carrier signal, the second frequency domain information is used for determining the frequency domain position of a backscatter signal, and the third frequency domain information is used for determining the frequency domain position of an actively transmitted signal. In the embodiments of the present application, first information is sent, wherein the first information is used for indicating a frequency domain resource used by a first terminal device for transmission, so as to realize frequency shifting-based backscatter transmission.

Description

Communication method, communication device, chip, computer-readable storage medium, and computer program product

[0001] This application claims priority to the Chinese patent application filed with the State Intellectual Property Office of China on March 8, 2024, with application number 202410270988.7, and priority to the Chinese patent application entitled “Communication method, communication device, chip, computer-readable storage medium and computer program product”, all contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of communications, and in particular to a communication method, a communication device, a chip, a computer-readable storage medium, and a computer program product. Background Art

[0003] The Ambient Internet of Things (Ambient IoT) aims to provide a standard solution that is battery-free, low-power, low-complexity, and low-cost. Within the Third Generation Partnership Project (3GPP) standards framework, it is a lower-capability standard than the cellular-based Narrowband Internet of Things (NB-IoT). Within non-3GPP frameworks, it targets the radio frequency identification (RFID) market, offering a comparable yet superior technical solution.

[0004] Ambient IoT can be applied in scenarios not covered by current 3GPP technologies, for example: 1) under extreme environmental conditions, such as high voltage, extremely high / low temperatures, and humid environments; 2) where ultra-low complexity, very small device size / form factor (e.g., millimeter thickness), maintenance-free operation (e.g., no need for traditional battery replacement), and extended lifecycles are strongly required; and 3) where traditional battery-powered devices are not suitable. Typically, IoT devices supporting ambient power (i.e., Ambient IoT devices) do not have traditional batteries and instead derive energy from other forms of the environment. For example, in some scenarios, Ambient IoT devices (abbreviated as AIoT devices) can derive energy from radio waves, which can originate from network entities (e.g., base stations) or user equipment. In other scenarios, Ambient IoT devices can derive energy from solar energy, light, motion / vibration, heat, pressure, or any other source of energy. Considering that backscattered signals co-occur with carrier signals in the same frequency domain, this can cause severe co-channel interference, and frequency division multiplexing (FDM) is not supported for multiple terminals, limiting network capacity. Currently, frequency shifting solutions are being considered to mitigate co-channel interference and increase network capacity from a frequency domain perspective. In frequency shifting solutions, how AIoT devices determine the frequency domain resources they use is a challenge that needs to be addressed. Summary of the Invention

[0005] The embodiments of the present application disclose a communication method, a communication device, a chip, a computer-readable storage medium, and a computer program product, which use frequency domain resources for transmission through a first terminal device to achieve backscatter transmission based on frequency shift.

[0006] In a first aspect, an embodiment of the present application provides a communication method, the method comprising: sending first information, the first information being used to indicate a frequency domain resource used for transmission by a first terminal device, the first information comprising one or more of first frequency domain information, second frequency domain information, and third frequency domain information, the first frequency domain information being used to determine the frequency domain position of a carrier wave (CW), the second frequency domain information being used to determine the frequency domain position of a backscattered signal, and the third frequency domain information being used to determine the frequency domain position of an actively transmitted signal. The execution subject of the first aspect may be a network side node such as a base station, an intermediate node, or an auxiliary node, or may be a module in a network side node such as a base station, an intermediate node, or an auxiliary node.

[0007] In an embodiment of the present application, first information is sent, and the first information is used to indicate the frequency domain resources used for transmission by the first terminal device, so as to realize backscatter transmission based on frequency shift.

[0008] In one possible implementation, the first information includes the second frequency domain information; the second frequency domain information is used to indicate the frequency offset between the carrier signal and the backscatter signal; or, the second frequency domain information is used to indicate the backscatter bandwidth and / or the protection bandwidth, the protection bandwidth is the protection interval between two adjacent backscatter bandwidths, and the backscatter bandwidth is the bandwidth occupied by the backscatter signal; or, the second frequency domain information is used to indicate a first index, and the first index indicates any one of the following: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, a frequency point position in multiple first absolute frequency points, a frequency offset in the first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the multiple first absolute frequency points is the frequency point position of the backscatter signal.

[0009] In this implementation, the first information includes second frequency domain information, so that the first terminal device determines the frequency domain position of the backscattered signal based on the second frequency domain information.

[0010] In a possible implementation, the first information includes the second frequency domain information, which is used to indicate a frequency division ratio of a basic clock frequency. The second frequency domain information is used to indicate a frequency division ratio of a basic clock frequency of the first terminal device.

[0011] In this implementation, the second frequency domain information is used to indicate the division ratio of the basic clock frequency, so that the first terminal device determines the frequency offset between the carrier signal and the backscattered signal based on the second frequency domain information, and then determines the frequency domain position of the backscattered signal.

[0012] In one possible implementation, the first information includes the second frequency domain information; the first information is included in a preamble sequence or a synchronization signal, and the second frequency domain information includes a first square wave sequence, where the first square wave sequence indicates a frequency offset between a carrier signal and a backscattered signal; or the second frequency domain information is used to indicate a first time interval, where the first time interval is used to determine the frequency offset between the carrier signal and the backscattered signal. Exemplarily, the number of repetitions of the first time interval within one second indicates the frequency offset between the carrier signal and the backscattered signal.

[0013] In this implementation, the second frequency domain information includes a first square wave sequence or is used to indicate a first time interval, so that the first terminal device determines the frequency offset between the carrier signal and the backscattered signal based on the second frequency domain information, and then determines the frequency domain position of the backscattered signal.

[0014] In a possible implementation, the first information includes the second frequency domain information, the second frequency domain information is a first preamble sequence, the first preamble sequence is used to determine a first offset, and the first offset represents a frequency offset between a carrier signal and a backscattered signal.

[0015] In this implementation, the first preamble sequence is used to determine the first offset. The preamble sequence implicitly indicates the frequency offset between the carrier signal and the backscatter signal, which can save signaling overhead.

[0016] In one possible implementation, the first information includes the third frequency domain information; the third frequency domain information is used to indicate the offset between the carrier signal and the actively transmitted signal; or, the third frequency domain information is used to indicate the active transmission bandwidth and / or protection bandwidth, the protection bandwidth is the protection interval between two adjacent active transmission bandwidths, and the active transmission bandwidth is the bandwidth occupied by the actively transmitted signal; or, the third frequency domain information is used to indicate the protection bandwidth, the active transmission bandwidth and the backscattering bandwidth, the protection bandwidth is the protection interval between two adjacent bandwidths, the active transmission bandwidth is the bandwidth occupied by the actively transmitted signal, and the backscattering bandwidth is the bandwidth occupied by the backscattered signal; the third frequency domain information is used to indicate a second index, and the second index indicates any one of the following items: a frequency offset in the second frequency offset list, an active transmission bandwidth in the active transmission bandwidth list, a frequency point position in multiple second absolute frequency points, a frequency offset in the second frequency offset list represents the frequency offset between the carrier signal and the actively transmitted signal, an active transmission bandwidth in the active transmission bandwidth list represents the bandwidth occupied by the actively transmitted signal, and a frequency point position in the multiple second absolute frequency points is the frequency point position of the actively transmitted signal.

[0017] In this implementation, the first information includes third frequency domain information, so that the first terminal device determines the frequency domain position of the actively transmitted signal based on the third frequency domain information.

[0018] In one possible implementation, the first information includes the third frequency domain information; the first information is included in a preamble sequence or a synchronization signal, and the third frequency domain information includes a second square wave sequence, where the second square wave sequence indicates a frequency offset between the carrier signal and the actively transmitted signal; or the third frequency domain information is used to indicate a second time interval, where the second time interval is used to determine the frequency offset between the carrier signal and the actively transmitted signal. Exemplarily, the number of repetitions of the second time interval within one second indicates the frequency offset between the carrier signal and the actively transmitted signal.

[0019] In this implementation, the third frequency domain information includes a second square wave sequence or is used to indicate a second time interval, so that the first terminal device determines the frequency offset between the carrier signal and the actively transmitted signal based on the third frequency domain information, and then determines the frequency domain position of the actively transmitted signal.

[0020] In a possible implementation, the first information includes the third frequency domain information, the third frequency domain information is a second preamble sequence, the second preamble sequence is used to determine a second offset, and the second offset represents an offset between a carrier signal and an actively transmitted signal.

[0021] In this implementation, the second preamble sequence is used to determine the second offset. By implicitly indicating the frequency offset between the carrier signal and the actively transmitted signal through the preamble sequence, signaling overhead can be saved.

[0022] In a possible implementation, the first information is sent in a broadcast form, and the first information carries frequency domain information available in response to the first information; or, the first information is information limited to use by the first terminal device.

[0023] When the first information is sent via broadcast, the first information carries frequency domain information available for responding to the first information, so that the first terminal device can respond to the first information based on the frequency domain information. The first information is information that limits the use of the first terminal device, preventing other terminal devices from determining frequency domain resources for their own transmissions based on the first information.

[0024] In a possible implementation, sending the first information includes: sending the first information when waking up the first terminal device; or sending the first information before instructing the first terminal device to perform an access process.

[0025] When waking up the first terminal device, first information is sent so that the first terminal device can determine the frequency domain resources to be used for transmission based on the first information after being woken up. Before instructing the first terminal device to perform an access process, first information is sent so that the first terminal device can determine the frequency domain resources to be used for transmission based on the first information.

[0026] In a possible implementation, the first terminal device is an Ambient IoT device (which may be referred to as an AIoT device).

[0027] In a second aspect, an embodiment of the present application provides another communication method, which includes: receiving first information, where the first information is used to indicate the frequency domain resources used for transmission by a first terminal device, the first information including one or more of first frequency domain information, second frequency domain information, and third frequency domain information, the first frequency domain information is used to determine the frequency domain position or center frequency of a carrier signal, the second frequency domain information is used to determine the frequency domain position of a backscattered signal, and the third frequency domain information is used to determine the frequency domain position of an actively transmitted signal; and transmitting based on the frequency domain resources indicated by the first information.

[0028] In an embodiment of the present application, based on the first information, one or more of the frequency domain position of the carrier signal, the frequency domain position of the backscatter signal, or the frequency domain position of the actively transmitted signal are determined, thereby realizing backscatter transmission based on frequency shift or active transmission.

[0029] In one possible implementation, the first information includes the second frequency domain information; the second frequency domain information is used to indicate the frequency offset between the carrier signal and the backscatter signal; or, the second frequency domain information is used to indicate the backscatter bandwidth and / or the protection bandwidth, the protection bandwidth is the protection interval between two adjacent backscatter bandwidths, and the backscatter bandwidth is the bandwidth occupied by the backscatter signal; or, the second frequency domain information is used to indicate a first index, and the first index indicates any one of the following: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, a frequency point position in multiple first absolute frequency points, a frequency offset in the first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the multiple first absolute frequency points is the frequency point position of the backscatter signal.

[0030] In a possible implementation, the first information includes the second frequency domain information, where the second frequency domain information is used to indicate a frequency division ratio of a basic clock frequency.

[0031] In one possible implementation, the first information includes the second frequency domain information; the first information is contained in a preamble sequence or a synchronization signal, and the second frequency domain information includes a first square wave sequence, and the first square wave sequence indicates the frequency offset between the carrier signal and the backscattered signal; or, the second frequency domain information is used to indicate a first time interval, and the first time interval is used to determine the frequency offset between the carrier signal and the backscattered signal.

[0032] In a possible implementation, the first information includes the second frequency domain information, the second frequency domain information is a first preamble sequence, the first preamble sequence is used to determine a first offset, and the first offset represents a frequency offset between a carrier signal and a backscattered signal.

[0033] In one possible implementation, the first information includes the third frequency domain information; the third frequency domain information is used to indicate the offset between the carrier signal and the actively transmitted signal; or, the third frequency domain information is used to indicate the active transmission bandwidth and / or protection bandwidth, the protection bandwidth is the protection interval between two adjacent active transmission bandwidths, and the active transmission bandwidth is the bandwidth occupied by the actively transmitted signal; or, the third frequency domain information is used to indicate the protection bandwidth, the active transmission bandwidth and the backscattering bandwidth, the protection bandwidth is the protection interval between two adjacent bandwidths, the active transmission bandwidth is the bandwidth occupied by the actively transmitted signal, and the backscattering bandwidth is the bandwidth occupied by the backscattered signal; or, the third frequency domain information is used to indicate a second index, and the second index indicates any one of the following items: a frequency offset in a second frequency offset list, an active transmission bandwidth in an active transmission bandwidth list, a frequency point position in multiple second absolute frequency points, a frequency offset in the second frequency offset list represents the frequency offset between the carrier signal and the actively transmitted signal, an active transmission bandwidth in the active transmission bandwidth list represents the bandwidth occupied by the actively transmitted signal, and a frequency point position in the multiple second absolute frequency points is the frequency point position of the actively transmitted signal.

[0034] In one possible implementation, the first information includes the third frequency domain information; the first information is contained in a preamble sequence or a synchronization signal, and the third frequency domain information includes a second square wave sequence, and the second square wave sequence indicates the frequency offset between the carrier signal and the actively transmitted signal; or, the third frequency domain information is used to indicate a second time interval, and the second time interval is used to determine the frequency offset between the carrier signal and the actively transmitted signal.

[0035] In a possible implementation, the first information includes the third frequency domain information, the third frequency domain information is a second preamble sequence, the second preamble sequence is used to determine a second offset, and the second offset represents an offset between a carrier signal and an actively transmitted signal.

[0036] In a possible implementation, the first information is sent in a broadcast form, and the first information carries frequency domain information available in response to the first information; or, the first information is information that limits the use of the first terminal device.

[0037] When the first information is sent via broadcast, the first information carries frequency domain information available for responding to the first information, so that the first terminal device can respond to the first information based on the frequency domain information. The first information is information that limits the use of the first terminal device, preventing other terminal devices from determining frequency domain resources for their own transmissions based on the first information.

[0038] For the technical effects brought about by various possible implementations of the second aspect, reference may be made to the introduction to the technical effects of various possible implementations of the first aspect.

[0039] In a third aspect, an embodiment of the present application provides a communication device having the function of implementing the behavior in the method embodiment of the first aspect above. The communication device can be a network device, or a component of a network device (such as a processor, chip, or chip system, etc.), or a logic module or software that can implement all or part of the functions of the network device. Alternatively, the communication device can be a terminal device, or a component of a terminal device (such as a processor, chip, or chip system, etc.), or a logic module or software that can implement all or part of the functions of the terminal device. The functions of the communication device can be implemented by hardware, or by hardware executing corresponding software. The hardware or software includes one or more modules or units corresponding to the above functions. In one possible implementation, the communication device includes a transceiver module, wherein the transceiver module is used to send first information, the first information is used to indicate the frequency domain resources used for transmission by the first terminal device, the first information includes one or more of first frequency domain information, second frequency domain information, and third frequency domain information, the first frequency domain information is used to determine the frequency domain position or center frequency of the carrier signal, the second frequency domain information is used to determine the frequency domain position of the backscattered signal, and the third frequency domain information is used to determine the frequency domain position of the actively transmitted signal.

[0040] In a possible implementation manner, the communication device further includes: a processing module, configured to generate the first information.

[0041] In a possible implementation, the transceiver module is specifically configured to send the first information when waking up the first terminal device; or, send the first information before instructing the first terminal device to perform an access process.

[0042] For possible implementations of the communication device of the third aspect, reference may be made to various possible implementations of the first aspect.

[0043] For the technical effects brought about by various possible implementations of the third aspect, reference may be made to the introduction to the technical effects of the first aspect or various possible implementations of the first aspect.

[0044] In a fourth aspect, an embodiment of the present application provides a communication device having the function of implementing the behavior in the method embodiment of the second aspect above. The communication device may be a terminal device, or a component of a terminal device (such as a processor, a chip, or a chip system, etc.), or a logic module or software that can implement all or part of the functions of the terminal device. The functions of the communication device can be implemented by hardware, or by hardware executing corresponding software implementations, and the hardware or software includes one or more modules or units corresponding to the above functions. In one possible implementation, the communication device includes a transceiver module and a processing module, wherein: the transceiver module is used to receive first information, the first information is used to indicate the frequency domain resources used for transmission by the first terminal device, the first information includes one or more of the first frequency domain information, the second frequency domain information, and the third frequency domain information, the first frequency domain information is used to determine the frequency domain position or center frequency of the carrier signal, the second frequency domain information is used to determine the frequency domain position of the backscattered signal, and the third frequency domain information is used to determine the frequency domain position of the actively transmitted signal; the processing module is used to transmit based on the frequency domain resources indicated by the first information.

[0045] In one possible implementation, the first information includes the second frequency domain information; the second frequency domain information is used to indicate the frequency offset between the carrier signal and the backscatter signal; or, the second frequency domain information is used to indicate the backscatter bandwidth and / or the protection bandwidth, the protection bandwidth is the protection interval between two adjacent backscatter bandwidths, and the backscatter bandwidth is the bandwidth occupied by the backscatter signal; or, the second frequency domain information is used to indicate a first index, and the first index indicates any one of the following: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, a frequency point position in multiple first absolute frequency points, a frequency offset in the first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the multiple first absolute frequency points is the frequency point position of the backscatter signal.

[0046] In a possible implementation, the first information includes the second frequency domain information, where the second frequency domain information is used to indicate a frequency division ratio of a basic clock frequency.

[0047] In one possible implementation, the first information includes the second frequency domain information; the first information is contained in a preamble sequence or a synchronization signal, and the second frequency domain information includes a first square wave sequence, and the first square wave sequence indicates the frequency offset between the carrier signal and the backscattered signal; or, the second frequency domain information is used to indicate a first time interval, and the first time interval is used to determine the frequency offset between the carrier signal and the backscattered signal.

[0048] In a possible implementation, the first information includes the second frequency domain information, the second frequency domain information is a first preamble sequence, the first preamble sequence is used to determine a first offset, and the first offset represents a frequency offset between a carrier signal and a backscattered signal.

[0049] In one possible implementation, the first information includes the third frequency domain information; the third frequency domain information is used to indicate the offset between the carrier signal and the actively transmitted signal; or, the third frequency domain information is used to indicate the active transmission bandwidth and / or protection bandwidth, the protection bandwidth is the protection interval between two adjacent active transmission bandwidths, and the active transmission bandwidth is the bandwidth occupied by the actively transmitted signal; or, the third frequency domain information is used to indicate the protection bandwidth, the active transmission bandwidth and the backscattering bandwidth, the protection bandwidth is the protection interval between two adjacent bandwidths, the active transmission bandwidth is the bandwidth occupied by the actively transmitted signal, and the backscattering bandwidth is the bandwidth occupied by the backscattered signal; or, the third frequency domain information is used to indicate a second index, and the second index indicates any one of the following items: a frequency offset in a second frequency offset list, an active transmission bandwidth in an active transmission bandwidth list, a frequency point position in multiple second absolute frequency points, a frequency offset in the second frequency offset list represents the frequency offset between the carrier signal and the actively transmitted signal, an active transmission bandwidth in the active transmission bandwidth list represents the bandwidth occupied by the actively transmitted signal, and a frequency point position in the multiple second absolute frequency points is the frequency point position of the actively transmitted signal.

[0050] In one possible implementation, the first information includes the third frequency domain information; the first information is contained in a preamble sequence or a synchronization signal, and the third frequency domain information includes a second square wave sequence, and the second square wave sequence indicates the frequency offset between the carrier signal and the actively transmitted signal; or, the third frequency domain information is used to indicate a second time interval, and the second time interval is used to determine the frequency offset between the carrier signal and the actively transmitted signal.

[0051] In a possible implementation, the first information includes the third frequency domain information, the third frequency domain information is a second preamble sequence, the second preamble sequence is used to determine a second offset, and the second offset represents an offset between a carrier signal and an actively transmitted signal.

[0052] In a possible implementation, the first information is sent in a broadcast form, and the first information carries frequency domain information available in response to the first information; or, the first information is information that limits the use of the first terminal device.

[0053] Possible implementations of the communication device of the fourth aspect may refer to the various possible implementations of the second aspect.

[0054] For the technical effects brought about by various possible implementations of the fourth aspect, reference may be made to the introduction to the technical effects of the second aspect or various possible implementations of the second aspect.

[0055] In a fifth aspect, an embodiment of the present application provides another communication device, which includes one or more processors, and the one or more processors are used to process data or signaling so that the method of the first aspect or the second aspect mentioned above is implemented.

[0056] Optionally, the communication device further includes a memory storing a program or instruction. When the program or instruction is executed by the processor, the communication device performs the method described in the first or second aspect. Exemplarily, the communication device may be a chip, the processor may be a processing circuit in the chip, and the memory may be a random access memory or cache in the chip.

[0057] In one possible implementation, during the execution of the above method, the process of sending information (or signals) in the above method can be understood as the process of outputting information based on instructions from the processor. When outputting information, the processor outputs the information to the transceiver for transmission by the transceiver. After being output by the processor, the information may undergo further processing before reaching the transceiver. Similarly, when the processor receives input information, the transceiver receives the information and inputs it into the processor. Furthermore, after receiving the information, the transceiver may undergo further processing before inputting it into the processor.

[0058] For operations such as sending and / or receiving involved in the processor, unless otherwise specified, or unless they conflict with their actual functions or internal logic in the relevant descriptions, they can be generally understood as instructions output based on the processor.

[0059] During implementation, the processor may be a processor specifically configured to execute these methods, or may be a processor that executes computer instructions in a memory to execute these methods, such as a general-purpose processor. For example, the processor may also be configured to execute a program stored in a memory. When the program is executed, the communication device performs the method described in the first aspect or any possible implementation of the first aspect.

[0060] In a possible implementation, the memory is located outside the communication device. In a possible implementation, the memory is located inside the communication device.

[0061] In a possible implementation, the processor and the memory may also be integrated into one device, that is, the processor and the memory may also be integrated together.

[0062] In a possible implementation, the communication device further includes a transceiver, and the transceiver is used to receive signals or send signals.

[0063] In a sixth aspect, the present application provides another communication device, which includes a processing circuit and an interface circuit, wherein the interface circuit is used to obtain data or output data; the processing circuit is used to execute the method shown in the first aspect or the second aspect above.

[0064] In a seventh aspect, the present application provides a computer-readable storage medium, which stores a computer program. The computer program includes program instructions, which, when executed, enable the computer to execute the method shown in the first aspect or the second aspect above.

[0065] In an eighth aspect, the present application provides a computer program product, which includes a computer program, and the computer program includes program instructions. When the program instructions are executed, the computer executes the method shown in the first aspect or the second aspect above.

[0066] In the ninth aspect, the present application provides a chip comprising a communication interface and a processor; the communication interface is used for transmitting and receiving signals of the chip; the processor is used for executing computer program instructions so that a communication device including the chip performs the method shown in the first aspect or the second aspect above.

[0067] In the tenth aspect, an embodiment of the present application provides a communication system, comprising the communication device described in the third aspect or any possible implementation of the third aspect, and the communication device described in the fourth aspect or any possible implementation of the fourth aspect. BRIEF DESCRIPTION OF THE DRAWINGS

[0068] FIG1A is a schematic diagram of an AIoT connection topology provided in an embodiment of the present application;

[0069] FIG1B is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application;

[0070] FIG1C is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application;

[0071] FIG1D is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application;

[0072] FIG1E is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application;

[0073] FIG2 is a flow chart of a communication method provided in an embodiment of the present application;

[0074] FIG3 is a schematic diagram of frequency domain resource division provided in an embodiment of the present application;

[0075] FIG4 is a schematic diagram of another frequency domain resource division provided in an embodiment of the present application;

[0076] FIG5 is a flow chart of another communication method provided in an embodiment of the present application;

[0077] FIG6 is a flow chart of another communication method provided in an embodiment of the present application;

[0078] FIG7 is a schematic structural diagram of a communication device 700 provided in an embodiment of the present application;

[0079] FIG8 shows a simplified schematic diagram of a base station structure;

[0080] FIG9 shows a simplified structural diagram of a terminal device. DETAILED DESCRIPTION

[0081] The terms "first" and "second" in the specification, claims and drawings of the present application are only used to distinguish different objects, rather than to describe a specific order. It will be understood that the various numerical numbers involved in the embodiments of the present application are only for the convenience of description and are not used to limit the scope of the embodiments of the present application. The size of the sequence number of each of the above processes does not mean the order of execution, and the order of execution of each process should be determined by its function and inherent logic. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units that are not listed, or optionally also includes other steps or units inherent to these processes, methods, products or devices.

[0082] References to "embodiments" herein mean that a particular feature, structure, or characteristic described in connection with the embodiments may be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it refer to independent or alternative embodiments that are mutually exclusive of other embodiments. It will be understood, both explicitly and implicitly, by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0083] The terms used in the following embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification of the present application and the appended claims, the singular expressions "one", "a kind of", "said", "above", "the" and "this" are intended to also include plural expressions, unless there is a clear contrary indication in the context. It should also be understood that the term "and / or" used in the present application refers to and includes any or all possible combinations of one or more listed items. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The term "multiple" used in the present application refers to two or more. In the textual description of the present application, the character " / " generally indicates that the objects associated before and after are in an "or" relationship.

[0084] It is understood that in each embodiment of the present application, "A corresponds to B" means that there is a corresponding relationship between A and B, and B can be determined according to A. However, it should also be understood that determining (or generating) B according to (or based on) A does not mean that B is determined (or generated) only according to (or based on) A, and B can also be determined (or generated) according to (or based on) A and other information.

[0085] It should be understood that, in this application, indication includes direct indication (also known as explicit indication) and implicit indication. Direct indication of information A refers to including information A; implicit indication of information A refers to indicating information A through the correspondence between information A and information B and the direct indication of information B. The correspondence between information A and information B can be predefined, pre-stored, pre-burned, or pre-configured.

[0086] It should be understood that, in this application, information C is used to determine information D, which includes both information D being determined solely based on information C and information D being determined based on information C and other information. Furthermore, information C can also be used to determine information D indirectly, for example, where information D is determined based on information E, and information E is determined based on information C.

[0087] In addition, in each embodiment of the present application, "network element A sends information A to network element B" can be understood as the destination end of the information A or the intermediate network element in the transmission path between the destination end and the network element B, which may include directly or indirectly sending information to network element B. "Network element B receives information A from network element A" can be understood as the source end of the information A or the intermediate network element in the transmission path between the source end and the network element A, which may include directly or indirectly receiving information from network element A. The information may be processed as necessary between the source end and the destination end of the information transmission, such as format changes, but the destination end can understand the valid information from the source end. Similar expressions in this application can be understood similarly and will not be elaborated here.

[0088] In the present application, the backscatter bandwidth can be the bandwidth occupied by the backscatter signal in the frequency domain (or the bandwidth occupied by the backscatter signal), or it can be the bandwidth of the backscattering operation of the AIoT device, that is, all signals within the bandwidth received by the antenna of the AIoT device will be reflected back. The bandwidth of the backreflection operation of the AIoT device can be the frequency domain position of the backscatter signal. In the present application, the active transmission bandwidth can be the bandwidth occupied by the active transmission signal in the frequency domain (or the bandwidth occupied by the active transmission signal), or it can be the bandwidth of the active transmission of the AIoT device (or the frequency domain position), that is, all signals actively sent by the AIoT device are located within the bandwidth. In the present application, the protection bandwidth can be the guard band between two adjacent backscatter bandwidths, or it can be the guard band between two adjacent active transmission bandwidths, or it can be the guard band between two adjacent bandwidths. In the present application, the absolute frequency point can be understood as the concept of the channel grid in the new radio (NR) system. In the embodiment of the present application, the AIoT device performs backscattering at a specific frequency point.

[0089] To facilitate understanding of the solutions of the present application, the following first introduces the terms and technical solutions involved in the embodiments of the present application.

[0090] At the 3GPP RAN plenary meeting, AIoT device capabilities were discussed and the following two capability levels were identified:

[0091] 1) Peak power consumption is around 1 microwatt, it has energy storage capability, no independent signal generation, no downlink or uplink signal amplification capability, and can participate in backscatter transmission;

[0092] 2) Peak power consumption is several hundred microwatts, with energy storage capability, uplink and / or downlink signal amplification capability, and the ability to perform uplink transmission via backscattering or independently generate uplink signals.

[0093] The capability level of the AIoT device is either of the two capability levels mentioned above. Some AIoT devices do not have the ability to generate signals independently, nor do they have the ability to amplify downlink signals or uplink signals, and can participate in backscatter transmission. Some AIoT devices have the ability to amplify uplink signals and / or downlink signals, can perform uplink transmission through backscattering, and can also independently generate uplink signals. Backscatter transmission can be transmitted by reflecting electromagnetic waves (such as radio frequency signals) generated by other devices or devices (such as base stations / intermediate nodes / auxiliary nodes). Active transmission can be the transmission of signals generated independently by itself.

[0094] Backscatter Technology:

[0095] Backscatter communication (BSC) can also be called backscatter communication. Backscatter communication can also be called back reflection communication, reflection communication, passive communication, passive communication, or ambient communication, etc., and the embodiments of the present application are not limited here. BSC refers to the process in which a BSC device (such as an AIoT device) modulates a radio frequency signal sent by other devices (such as UE, network-side devices, etc.) or in the environment, and carries the data information of the BSC device on the radio frequency signal. Among them, the BSC device can control the reflection coefficient of the circuit of the BSC device by adjusting its internal impedance, thereby changing the amplitude, frequency, phase, etc. of the radio frequency signal to achieve modulation of the radio frequency signal. The BSC device can be a tag in a radio frequency identification (RFID) system, or a passive Internet of Things (IOT) unit, or an active IOT unit, a reconfigurable intelligent surface (RIS) unit in an intelligent metasurface, or an AIoT device, etc.

[0096] In backscatter communication, the sender does not actively generate a signal, but instead communicates by reflecting electromagnetic waves generated by other devices. Backscatter is typically implemented using the following basic concept: the sender switches its antenna between fully absorbing and fully reflecting signals. Accordingly, the signal reflected from the sender in these two states has different amplitudes, which can be used to represent different information.

[0097] When electromagnetic waves propagate across the boundary between two media with different impedances, they will be absorbed or reflected to a certain extent. Therefore, information transmission can be achieved simply by switching the impedance at the antenna. Backscatter technology can reduce the power consumption of RF devices by several orders of magnitude, making it a significant advantage in various IoT applications.

[0098] The 3GPP RAN plenary meeting studied the AIoT connection topology. Figures 1A, 1B, 1C, 1D, and 1E show schematic diagrams of four categories and five types of AIoT connection topologies.

[0099] Figure 1A is a schematic diagram of an AIoT connection topology provided in an embodiment of the present application. The AIoT connection topology shown in Figure 1A includes a base station and an AIoT device, and signal transmission is directly performed between the base station (BS) and the AIoT device, wherein the AIoT device independently generates an uplink signal and sends it to the base station, or the AIoT device modulates the radio frequency signal sent by the base station, and the radio frequency signal carries the data information to be transmitted.

[0100] Figure 1B is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application. The AIoT connection topology shown in Figure 1B includes a base station, an intermediate node, and an AIoT device. Signals are transmitted directly between the intermediate node and the AIoT device, wherein the AIoT device independently generates an uplink signal and sends it, or the AIoT device modulates the received RF signal and carries the data information to be transmitted on the RF signal.

[0101] Figure 1C is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application. The AIoT connection topology shown in Figure 1C includes a base station, an assisting node, and an AIoT device. The assisting node sends information to the AIoT device, and the signal sent by the AIoT device is received by the base station, that is, it is not forwarded by the assisting node. The AIoT device independently generates an uplink signal and sends it, or the AIoT device modulates the external radio frequency signal and carries the data information it needs to transmit on the radio frequency signal.

[0102] Figure 1D is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application. The AIoT connection topology shown in Figure 1D includes a base station, an assisting node, and an AIoT device. The base station (BS) sends a signal to the AIoT device, and the AIoT device independently generates an uplink signal and sends it to the assisting node, or the AIoT device modulates the external RF signal. The modulated RF signal sent by the AIoT device is received by the assisting node, and the modulated RF signal carries the data information that the AIoT device needs to transmit. The AIoT connection topologies shown in Figures 1C and 1D belong to the same category.

[0103] Figure 1E is a schematic diagram of another AIoT connection topology provided in an embodiment of the present application. The AIoT connection topology shown in Figure 1E includes user equipment (UE) and an AIoT device, and signal transmission is directly performed between the UE and the AIoT device, wherein the AIoT device independently generates an uplink signal and sends it to the UE or the AIoT device modulates the external radio frequency signal and carries the data information that needs to be transmitted on the radio frequency signal. It should be noted that the first terminal device in the embodiment of the present application refers to an AIoT device, and the first node can be a base station, an auxiliary node, an intermediate node, or a terminal device (such as the UE in the topology shown in Figure 1E).

[0104] It should be noted that Figures 1A, 1B, 1C, 1D, and 1E are only examples of AIoT connection topologies. The number of network elements (including base stations, auxiliary nodes, intermediate nodes, UEs, and AIoT devices) in the AIoT connection topology is not limited.

[0105] Backscatter frequency shifting technology: In radio frequency identification (RFID), the excitation signal and the reflected signal are at the same frequency, resulting in interference between them. Referring to the AIoT connection topology diagram shown in Figures 1A to 1E, in order to reduce this interference, for example, the interference received by the receiving end of the AIoT device, the reflected signal of the AIoT device can be frequency shifted (frequency shifting) to make it away from the frequency of the excitation signal (i.e., the received signal of the AIoT device). In this way, the interference received by the receiver (or receiving end) when receiving the reflected signal of the AIoT device will be significantly reduced.

[0106] The technical solutions described in the embodiments of the present application can be applied to various communication systems, such as wireless fidelity (Wi-Fi) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD) systems, universal mobile telecommunication systems (UMTS), world wide interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems or new radio (NR), sixth generation (6G) systems, Internet of Things (IoT) networks or vehicle to x (V2X), etc. In the embodiments of the present application, the terms "system" and "network" are often used interchangeably, and the described technologies can be used for the systems and radio technologies mentioned above as well as for other systems and radio technologies. The following description describes an NR system for example purposes, and NR terminology is used in most of the following description, but these techniques may also be applied to applications other than NR system applications, such as 6th generation (6G) communication systems.

[0107] In the embodiment of the present application, UE may also be referred to as terminal equipment, access terminal, user unit, user station, mobile station, mobile station, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device.

[0108] The terminal device may be a device that provides wireless communication functions, such as a handheld device or a vehicle-mounted device with a wireless connection function. At present, some examples of terminal devices are: AIoT devices, mobile phones, radio frequency identification (RFID) tags, satellite mobile terminals, cellular phones, smart phones, tablet computers, laptops, PDAs, mobile internet devices (MIDs), wearable devices (such as smart watches, smart bracelets, pedometers, smart glasses, etc.), vehicle-mounted devices (such as cars, bicycles, electric vehicles, airplanes, ships, trains, high-speed railways, etc.), satellite terminals, virtual reality (VR) devices, augmented reality (AR) devices, smart point of sale (POS) machines, customer-premises equipment (CPE), wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, and wireless terminals in smart homes. The present invention also includes wireless terminals in the home (for example, refrigerators, televisions, air conditioners, electric meters, etc.), intelligent robots, robotic arms, cellular phones, cordless phones, session initiation protocol (SIP) phones, wireless local loop (WLL) stations, personal digital assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to wireless modems, flying devices (for example, intelligent robots, hot air balloons, drones, airplanes), terminal devices in 5G networks, or terminal devices in future evolved public land mobile networks (PLMNs), etc. The embodiments of the present application are not limited to this.

[0109] As an example and not a limitation, in the embodiment of the present application, the terminal device may also be a wearable device. Wearable devices may also be called wearable smart devices, which are a general term for wearable devices that are intelligently designed and developed using wearable technology for daily wear, such as glasses, gloves, watches, clothing, and shoes. A wearable device is a portable device that is worn directly on the body or integrated into the user's clothes or accessories. Wearable devices are not only hardware devices, but also achieve powerful functions through software support, data interaction, and cloud interaction. Broadly speaking, wearable smart devices include those that are fully functional, large in size, and can achieve complete or partial functions without relying on smartphones, such as smart watches or smart glasses, as well as those that only focus on a certain type of application function and need to be used in conjunction with other devices such as smartphones, such as various smart bracelets and smart jewelry for vital sign monitoring.

[0110] In the embodiments of the present application, the device for realizing the function of the terminal device can be a terminal device, or a device capable of supporting the terminal device to realize the function, such as a chip system, which can be installed in the terminal device or used in combination with the terminal device. In the embodiments of the present application, the chip system can be composed of a chip, or it can include a chip and other discrete devices. In the embodiments of the present application, only the terminal device is used as an example for description, and the embodiments of the present application are not limited to the solutions of the embodiments of the present application.

[0111] In this application, a base station is an example of an access network device, and the base station can be replaced by other forms of access network devices. The access network device in the embodiment of the present application can be a device for communicating with an AIoT device, and the access network device can also be referred to as a network device or a wireless access network device. The access network device in the embodiment of the present application can refer to a radio access network (RAN) node (or device) that connects a terminal device to a wireless network.

[0112] In one possible scenario, an access network device may be a base station, an evolved NodeB (eNodeB), a transmitting and receiving point (TRP), a transmitting point (TP), a RIFD reader, an intermediate node / assistant node in a network topology, a next-generation NodeB (gNB), a next-generation base station in a sixth-generation (6G) mobile communication system, a base station in a future mobile communication system, a satellite, an access point (AP) in a WiFi system, an integrated access and backhaul (IAB) node, or an access network device in a mobile switching center non-terrestrial network (NTN) communication system, i.e., it may be deployed on a high-altitude platform or satellite. The access network device may be a macro base station, a micro base station or an indoor station, a relay node or a donor node, or a wireless controller in a cloud radio access network (CRAN) scenario. The access network device can also be a device that acts as a base station in device-to-device (D2D) communication, Internet of Vehicles communication, drone communication, and machine communication. Optionally, the access network device can also be a server, a wearable device, a vehicle or an on-board device, etc. For example, the access network device in vehicle to everything (V2X) technology can be a road side unit (RSU). The IAB node integrates two parts: a mobile terminal (MT) and a distributed unit (DU). When the IAB node faces its parent node, it can be regarded as a terminal. At this time, the IAB node plays the role of MT; when the IAB node faces its child node (the child node may be a terminal or the MT of another IAB node), the IAB node can be regarded as an access network device. An IAB node can establish a backhaul connection with at least one parent node of the IAB node through the MT part. The DU part of an IAB node can provide access services for the MT part of a terminal or other IAB nodes.

[0113] In another possible scenario, multiple access network devices collaborate to assist the terminal in achieving wireless access, and different access network devices respectively implement part of the functions of the base station. For example, the access network device can be a centralized unit (CU), a distributed unit (DU), a CU-control plane (CP), a CU-user plane (UP), or a radio unit (RU). The CU and DU can be set separately, or they can also be included in the same network element, such as a baseband unit (BBU). The RU can be included in a radio frequency device or a radio frequency unit, such as a remote radio unit (RRU), an active antenna unit (AAU), or a remote radio head (RRH). It can be understood that the access network device can be a CU node, a DU node, or a device including a CU node and a DU node. In addition, the CU can be divided into an access network device in the access network RAN, or the CU can be divided into an access network device in the core network CN, which is not limited here.

[0114] In different systems, CU (or CU-CP and CU-UP), DU or RU may also have different names, but those skilled in the art can understand their meanings. For example, in the ORAN system, CU may also be called O-CU (Open CU), DU may also be called O-DU, CU-CP may also be called O-CU-CP, CU-UP may also be called O-CU-UP, and RU may also be called O-RU. For the convenience of description, this application uses CU, CU-CP, CU-UP, DU and RU as examples for description. Any unit of 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. The embodiments of this application do not limit the specific technology and specific device form adopted by the access network equipment.

[0115] This application mainly considers the frequency domain resources for uplink transmission of AIoT devices, and provides the frequency domain resources used by AIoT devices when performing backscatter transmission or independent signal transmission (i.e., actively sending transmission). Specifically, this application provides which frequency shift-related information needs to be indicated, on which resources this information is carried, and how this information is sent.

[0116] The technical solution provided by this application is introduced below with reference to the accompanying drawings.

[0117] FIG2 is a flow chart of a communication method provided in an embodiment of the present application. As shown in FIG2 , the method includes:

[0118] 201. A first node sends first information.

[0119] Correspondingly, the first terminal device receives the first information from the first node. In the embodiment of the present application, the apparatus for realizing the function of the first node may be the first node, or it may be an apparatus capable of supporting the first node to realize the function, such as a chip system, which may be installed in the first node or used in combination with the first node. In the embodiment of the present application, the apparatus for realizing the function of the first terminal device may be the first terminal device, or it may be an apparatus capable of supporting the first terminal device to realize the function, such as a chip system, which may be installed in the first terminal device or used in combination with the first terminal device. In the embodiment of the present application, the chip system may be composed of chips, may include only chips, or may include chips and other discrete devices. In the embodiment of the present application, only the apparatus for realizing the function of the first node is taken as an example for explanation, and the apparatus for realizing the function of the first terminal device is taken as an example for explanation, and the scheme of the embodiment of the present application is not limited.

[0120] The first node may send the first information in a broadcast format, or in a unicast or multicast format. In an embodiment of the present application, the first node may be a base station, an intermediate node, an auxiliary node, or a UE, and the first terminal device may be a device that supports backscatter transmission. The embodiment of the present application is described using the example of an AIoT device as the first terminal device. In one possible implementation, referring to Figures 1A, 1D, and 1E, the first node sends the first information to the first terminal device, and the first terminal device receives the first information from the first node. In the AIoT connection topology shown in Figures 1A and 1D, the first node is a base station, and in the AIoT connection topology shown in Figure 1E, the first node is a UE. In one possible implementation, referring to Figure 1B, the first node sends the first information to the first terminal device, and the first terminal device receives the first information from the first node. The first node is an intermediate node. In one possible implementation, referring to Figure 1C, the first node sends the first information to the first terminal device, and the first terminal device receives the first information from the first node. The first node is an auxiliary node. The first terminal device may be a device that supports active transmission and / or backscatter communication. The device that supports active transmission can be an AIoT device or other devices. The device that supports backscatter communication can be an AIoT device or other devices. For the convenience of description, the AIoT connection topology shown in Figures 1A to 1E is described below as an example. In an embodiment of the present application, the AIoT device can be a device that supports backscatter communication, which belongs to a passive internet of things (Passive-IoT) device; it can also be a semi-passive (i.e., semi-passive) device, the downlink reception or uplink reflection of which has a certain amplification capability; it can also be a device with active transmission capability, the transmission of which does not rely on a carrier signal. In this application, active transmission refers to the transmission of a signal generated based on a carrier signal generated by itself.

[0121] The above-mentioned first information is used to indicate the frequency domain resources used for transmission by the first terminal device. The transmission here includes the transmission of one or more of the carrier signal, the active transmission signal, the backscattered signal, etc. The above-mentioned first information includes one or more of the first frequency domain information, the second frequency domain information and the third frequency domain information. The above-mentioned first frequency domain information is used to determine the frequency domain position or center frequency of the carrier signal, the above-mentioned second frequency domain information is used to determine the frequency domain position of the backscattered signal, and the above-mentioned third frequency domain information is used to determine the frequency domain position of the active transmission signal. The carrier signal is mainly used for backscattering. The carrier signal refers to an unmodulated waveform signal, generally a sine wave. The carrier signal can be a signal sent by a network device (including a base station, an intermediate node, an auxiliary node, etc.) or a terminal device for the AIoT device to send a backscattered signal. The AIoT device (such as the first terminal device) modulates the received carrier signal to obtain a backscattered signal. In other words, the AIoT device modulates and reflects the received carrier signal to achieve the transmission of the backscattered signal (i.e., the modulated carrier signal).

[0122] The first frequency domain information can be named carrier frequency domain information. The second frequency domain information can be named reverse scattering frequency domain information. The third frequency domain information can be named actively transmitted frequency domain information. In this application, the naming of each information is not limited. The first frequency domain information, the second frequency domain information and the third frequency domain information can be sent simultaneously, that is, carried on the same signal / channel / frame; or they can not be sent simultaneously, for example, the first frequency domain information, the second frequency domain information and the third frequency domain information are sent through multiple signals / channels / frames. Alternatively, any two of the first frequency domain information, the second frequency domain information and the third frequency domain information are sent simultaneously, that is, carried on the same signal / channel / frame, and the rest are sent through other signals / channels / frames.

[0123] In one possible implementation, the first node generates the above-mentioned first information before sending the first information. The first information can be sent to a single terminal device or multiple terminal devices. In other words, the first information can be for a certain part of the terminal devices or for a certain terminal device. The terminal device here can be a device that sends a backscattered signal, such as the AIoT device in Figures 1A to 1E. Exemplarily, the first node can send the first information to all AIoT devices (including the first terminal device) before access (inventory process / random access process), and the first information also carries the available frequency domain information for responding to the above-mentioned first information. The frequency domain information available in response to the above-mentioned first information can be the only available frequency domain information used when the first terminal device responds to the first information (broadcast information) (for example, only used in the current access process). In this example, multiple AIoT devices that receive the first information can use channel contention and other methods to avoid feedback on the same resource (i.e., the resource corresponding to the frequency domain information available in response to the above-mentioned first information), thereby avoiding conflicts. Exemplarily, the first node periodically broadcasts the first information so that the AIoT device can receive the first information in a timely manner. Exemplarily, the first node sends the first information after access (inventory process / random access process), for example, in a UE-specific form, that is, the first information requires a specific AIoT device (i.e., the first terminal device) to use, and the first information includes an identifier of the first terminal device. When the sending of the first information is accompanied by grouping information, the first information may be for multiple terminal devices in the same group (including the above-mentioned first terminal device), and the first information may carry a group identifier.

[0124] In one possible implementation, the first information may be transmitted along with the channel / signal / frame / information / field. For example, the first information may be transmitted only on some channels / signals / frames / information. For another example, the first information may be transmitted on every channel / signal / frame / information.

[0125] 202. The first terminal device transmits based on the frequency domain resources indicated by the first information.

[0126] In an embodiment of the present application, first information is sent, and the first information is used to indicate the frequency domain resources used for transmission by the first terminal device, so as to determine the transmission position.

[0127] In one possible implementation, the first information includes the first frequency domain information described above, and the first frequency domain information is used to determine the frequency domain position of the carrier signal. Exemplarily, the first frequency domain information is used to indicate the center frequency of the carrier signal and the carrier signal bandwidth (i.e., the bandwidth occupied by the carrier signal). Exemplarily, the carrier signal bandwidth is specified by the protocol, and the first frequency domain information is used to indicate the center frequency of the carrier signal.

[0128] In a possible implementation, the first information includes the second frequency domain information, which is used to determine the frequency domain position of the backscattered signal. Several possible implementations of the second frequency domain information are described below.

[0129] Method 1: The second frequency domain information is used to indicate the frequency offset between the carrier signal and the backscattered signal.

[0130] The frequency offset between the carrier signal and the backscatter signal can be the frequency offset between the center frequency of the carrier signal (i.e., the center frequency of the bandwidth occupied by the carrier signal) and the center frequency of the backscatter signal (i.e., the center frequency of the bandwidth occupied by the backscatter signal), or it can be the frequency offset between the edge (boundary) of the carrier signal bandwidth and the edge (boundary) of the backscatter bandwidth. The following description takes the frequency offset between two signals as the frequency offset between the center frequencies of the two signals as an example. In one possible implementation, the first frequency domain information is used to indicate the center frequency of the carrier signal; the first terminal device determines the center frequency of the backscatter signal based on the center frequency of the carrier signal and the frequency offset between the carrier signal and the backscatter signal, wherein the center frequency of the backscatter signal is: the center frequency of the carrier signal + the frequency offset between the carrier signal and the backscatter signal; then, based on the center frequency of the backscatter signal, the frequency domain position of the backscatter signal is determined. The bandwidth of the backscatter signal is the same as the bandwidth of the carrier signal. For example, the bandwidth of the carrier signal is X MHz, the center frequency of the carrier signal is C1, and the frequency offset between the carrier signal and the backscattered signal is f1; the center frequency of the backscattered signal is (C1+f1), and the frequency domain position of the backscattered signal is [C1+f1-X / 2, C1+f1+X / 2], where C1, f1, and X are real numbers greater than 0. In one possible implementation, the first frequency domain information is used to indicate the frequency domain position of the carrier signal; the first terminal device determines the frequency domain position of the backscattered signal based on the frequency domain position of the carrier signal and the frequency offset between the carrier signal and the backscattered signal, the bandwidth of the backscattered signal is the same as the bandwidth of the carrier signal, and the frequency domain position of the carrier signal is the frequency domain position of the backscattered signal offset according to the frequency offset. For example, the frequency domain position of the carrier signal is [B1, B2], the frequency offset between the carrier signal and the backscattered signal is f1, and the frequency domain position of the backscattered signal is [B1+f1, B2+f1], where B1, B2, and f1 are real numbers greater than 0. In another possible implementation, the center frequency of the carrier signal is specified by the protocol, and the first terminal device determines the center frequency of the backscatter signal based on the center frequency of the carrier signal and the frequency offset between the carrier signal and the backscatter signal, wherein the center frequency of the backscatter signal is: the center frequency of the carrier signal + the frequency offset between the carrier signal and the backscatter signal; then, based on the center frequency of the backscatter signal, the frequency domain position of the backscatter signal is determined.

[0131] For the first terminal device that supports backscatter communication, the present application implements frequency division multiplexing of frequency domain resources. A possible design method is shown in Figure 3. Figure 3 is a schematic diagram of a frequency domain resource division provided by an embodiment of the present application. As shown in Figure 3, the horizontal line filling area is the position of the carrier signal, that is, the carrier signal bandwidth. The entire carrier signal bandwidth is X MHz, and the value of X can be set according to demand; the white area is the protection bandwidth; a black area is a backscatter bandwidth. There are three backscatter bandwidths in Figure 3, and the frequency domain offsets from the center frequency of the carrier signal are frequency offset 1, frequency offset 2, and frequency offset 3 respectively; the oblique line area is not limited. Exemplarily, the second frequency domain information is used to indicate the frequency offset between the center frequency of the carrier signal and the center frequency of the backscatter signal, such as frequency offset 1 / frequency offset 2 / frequency offset 3. It should be noted that Figure 3 is only an example of a frequency domain resource division. The various areas in Figure 3 may exist or not, and there is no limitation on these. One possible way is that there are only horizontal line filling areas, white areas, and black areas in Figure 3 above, and other areas (oblique line areas) do not exist. One possible way is that in Figure 3 above, only the horizontal line filling area and the black area exist, and other areas (the oblique line area and the white area) do not exist.

[0132] Method 2: The second frequency domain information is used to indicate the backscatter bandwidth (one bandwidth, for example, 5 MHz) and / or the protection bandwidth (one bandwidth, for example, 5 MHz). The above-mentioned protection bandwidth is the protection interval between two adjacent bandwidths, and the above-mentioned backscatter bandwidth is the bandwidth occupied by the backscatter signal. Referring to Figure 3, the width of each black area is equal to the backscatter bandwidth, and the width of each white area is equal to the protection bandwidth. Optionally, the second frequency domain information is used to indicate that the backscatter bandwidth is Y MHz, the protection bandwidth is Z MHz, and the reference frequency. Optionally, the reference frequency is specified by the protocol, and the second frequency domain information is used to indicate that the backscatter bandwidth is Y MHz and the protection bandwidth is Z MHz. The protocol supported by the first node and the first terminal device defines the division of frequency domain resources. The reference frequency may be the frequency corresponding to the lower boundary of a certain protection bandwidth (for example, the first protection bandwidth from bottom to top in Figure 3), the center frequency of the carrier signal, the edge of the carrier signal bandwidth (upper boundary / lower boundary), or other frequency points, and this application does not limit it. For example, when the reference frequency point is the frequency point corresponding to the lower boundary of a certain protection bandwidth (such as the first protection bandwidth from bottom to top in Figure 3), the first terminal device defines the division of frequency domain resources based on the second frequency domain information and the supported protocol (see Figure 3), and can determine that the frequency domain positions of the three backscattered signals are [C+Z, C+Z+Y], [C+2*Z+Y, C+2*Z+2*Y], [C+3*Z+2*Y, C+3*Z+3*Y], where C is the reference frequency point. In this example, when the reference frequency is the center frequency of the carrier signal, the first terminal device defines the division of frequency domain resources based on the second frequency domain information and the supported protocol (see Figure 3), and can determine that the frequency domain positions of the three backscattered signals are [C+X / 2+V, C+X / 2+V+Y], [C+X / 2+V+Y+Z, C+X / 2+V+2*Y+Z], [C+X / 2+V+2*Y+2*Z, C+X / 2+V+3*Y+2*Z], where C is the reference frequency, X is the carrier signal bandwidth, and V is the bandwidth between the upper boundary of the carrier signal bandwidth and the lower boundary of the lowest frequency backscatter bandwidth. V and X can be specified by the protocol, indicated by the second frequency domain information, or determined by other means, which are not limited here. In this example, when the reference frequency point is the upper boundary (edge) of the carrier signal bandwidth, the first terminal device defines the division of frequency domain resources based on the second frequency domain information and the supported protocol (see Figure 3), and can determine that the frequency domain positions of the three backscattered signals are [C+V, C+V+Y], [C+V+Y+Z, C+V+2*Y+Z], [C+V+2*Y+2*Z, C+V+3*Y+2*Z], where C is the reference frequency point and V is the bandwidth between the upper boundary of the carrier signal bandwidth and the lower boundary of the backscatter bandwidth with the lowest frequency. V and X can be specified by the protocol and can be indicated by the second frequency domain information.

[0133] It should be noted that the frequency domain positions of the backscattered signal determined by the first terminal device are all frequency domain positions available for the first terminal device to send the backscattered signal. The first terminal device can decide which frequency domain position of the backscattered signal to select to send the backscattered signal. For example, the first terminal device can randomly select a frequency domain position of a backscattered signal to send the backscattered signal. C, Y, Z, V, and X are all real numbers greater than 0. The embodiment of the present application does not limit the values ​​of C, Y, Z, V, and X. For example, the second frequency domain information is used to indicate that the backscattered bandwidth is Y MHz, and the protocol supported by the first node and the first terminal device defines the division of frequency domain resources, the protection bandwidth is Z MHz, and the reference frequency point.

[0134] Mode three, the second frequency domain information is used to indicate the first index, and the above-mentioned first index indicates any one of the following items: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, a frequency point position in multiple first absolute frequency points, a frequency offset in the above-mentioned first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the above-mentioned backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the above-mentioned multiple first absolute frequency points is the frequency point position of the above-mentioned backscatter signal (i.e., the center frequency point of the backscatter signal). The first frequency offset list can be specified by the protocol supported by the first node and the first terminal device, or it can be configured by the first node to the first terminal device through signaling. The backscatter bandwidth list can be specified by the protocol supported by the first node and the first terminal device, or it can be configured by the first node to the first terminal device through signaling. The above-mentioned multiple first absolute frequency points can be specified by the protocol supported by the first node and the first terminal device. Table 1 shows an example of the first frequency offset list. The first column in Table 1 is the value of the first index, and the second column is the frequency offset between the carrier signal and the backscatter signal. The number of values ​​of the first index in Table 1 is not limited.

[0135] Table 1

[0136] Exemplarily, the first index indicates a frequency offset in the first frequency offset list; for example, when the value of the first index is 0, the first index indicates frequency offset 1. Based on the first index, the first terminal device can determine the center frequency of the backscatter signal as: the center frequency of the carrier signal + frequency offset 1; based on the center frequency and bandwidth of the backscatter signal, determine the frequency domain position of the backscatter signal. The bandwidth of the backscatter signal can be specified by the protocol. For example, the bandwidth of the backscatter signal is X1, and the frequency domain position of the backscatter signal is [center frequency of the backscatter signal - X1 / 2, center frequency of the backscatter signal + X1 / 2], where X1 is a real number greater than 0.

[0137] The backscatter bandwidth list may include multiple backscatter bandwidth frequency ranges. Table 2 shows an example of a backscatter bandwidth list. The number of values ​​of the first index in Table 2 is not limited. The frequency range of the backscatter bandwidth is greater than or equal to the frequency range of the carrier signal.

[0138] Table 2

[0139] Exemplarily, the first index indicates a backscatter bandwidth in the backscatter bandwidth list. For example, the three black areas shown in Figure 3 are numbered (indexed) as 0, 1, and 2 from top to bottom. When the value of the first index is 1, the first index indicates the second black area from top to bottom in Figure 3. Based on the first index, the first terminal device can determine that the frequency band range of the backscatter bandwidth is frequency band range 2.

[0140] Exemplarily, the first index indicates a frequency position among multiple first absolute frequency points, such as frequency position 1. Based on the first index, the first terminal device may determine that the center frequency point of the backscatter signal is frequency position 1. Then, based on frequency position 1, the frequency domain position of the backscatter signal is determined. The bandwidth of the backscatter signal may be specified by the protocol. For example, the bandwidth of the backscatter signal is X1, and the frequency domain position of the backscatter signal is [frequency position 1-X1 / 2, frequency position 1+X1 / 2], where X1 is a real number greater than 0.

[0141] Mode 4: The second frequency domain information indicates the frequency division ratio of the basic clock frequency.

[0142] The frequency division ratio of the basic clock frequency (or basic clock frequency) can be the ratio of the basic clock frequency of the first terminal device to the frequency offset Δf, and the frequency offset Δf can be the frequency offset between the carrier signal and the backscattered signal. The basic clock frequency can be the clock frequency of the first terminal device. In one possible implementation, after generating the basic clock frequency, the first terminal device generates different clock frequencies by frequency division. Based on its basic clock frequency f and the frequency division ratio DR, the first terminal device can determine that the frequency offset between the carrier signal and the backscattered signal is Then, based on the frequency offset and the center frequency of the carrier signal, the center frequency of the backscattered signal is determined to be: the center frequency of the carrier signal + Δf; based on the center frequency of the backscattered signal and the bandwidth of the backscattered signal, the frequency domain position of the backscattered signal is determined. In method 2, the second frequency domain information only needs to indicate the frequency division ratio, and the first node needs to know the basic clock frequency of each terminal device (including the first terminal device) or the basic clock frequency of all terminal devices specified by the standard.

[0143] Mode 5: The second frequency domain information includes a first square wave sequence, where the first square wave sequence indicates a frequency offset between the carrier signal and the backscattered signal.

[0144] In one possible implementation, the first information is included in a preamble sequence, a synchronization signal, or other signals / channels, and the second frequency domain information in the first information includes a first square wave sequence. Exemplarily, the first square wave sequence is {0, 1, 0, 1, 0, 1, ...}, and the frequency of the first square wave sequence is Δf, which is the frequency offset (or frequency shift frequency) between the carrier signal and the backscattered signal. The first terminal device can determine the frequency offset between the carrier signal and the backscattered signal based on the first square wave sequence; then, based on the frequency offset and the center frequency of the carrier signal, determine the center frequency of the backscattered signal; and based on the center frequency of the backscattered signal and the bandwidth of the backscattered signal, determine the frequency domain position of the backscattered signal.

[0145] Mode six: the second frequency domain information includes a first time interval, and the first time interval is used to determine a frequency offset (or a shift frequency) between the carrier signal and the backscattered signal.

[0146] The first time interval can be understood as the duration of a level state (0 or 1) corresponding to the first square wave sequence in Mode 3. The first terminal device can determine the frequency offset between the carrier signal and the backscattered signal based on the first time interval; then, based on the frequency offset and the center frequency of the carrier signal, determine the center frequency of the backscattered signal; and based on the center frequency of the backscattered signal and the bandwidth of the backscattered signal, determine the frequency domain position of the backscattered signal.

[0147] Method 7: The second frequency domain information corresponds to the first preamble sequence, and the first preamble sequence is used to determine the first offset. The above-mentioned first offset represents the frequency offset between the carrier signal and the backscattered signal. Exemplarily, the second frequency domain information is the first preamble sequence, and the first preamble sequence corresponds to the first offset. The first terminal device can determine the first offset based on the first preamble sequence; then, based on the frequency offset and the center frequency of the carrier signal, determine the center frequency of the backscattered signal; and based on the center frequency of the backscattered signal and the bandwidth of the backscattered signal, determine the frequency domain position of the backscattered signal.

[0148] The idea of ​​the seventh method is to design different preamble sequences corresponding to different frequency domain positions of the backscattered signal, that is, to implicitly indicate the frequency offset between the carrier signal and the backscattered signal by using different preamble sequences.

[0149] In a possible implementation, the first information includes the third frequency domain information, which is used to determine the frequency domain position of the active signal transmission. Several possible implementations of the third frequency domain information are described below.

[0150] Method 1: The third frequency domain information is used to indicate the frequency offset between the carrier signal and the actively transmitted signal. The frequency offset between the carrier signal and the actively transmitted signal can be the frequency offset between the center frequency of the carrier signal and the center frequency of the actively transmitted signal (i.e., the center frequency of the bandwidth occupied by the actively transmitted signal), or it can be the frequency offset between the edge (boundary) of the carrier signal bandwidth and the edge (boundary) of the actively transmitted bandwidth. In one possible implementation, the first frequency domain information is used to indicate the center frequency of the carrier signal; the first terminal device determines the center frequency of the actively transmitted signal based on the center frequency of the carrier signal and the frequency offset between the carrier signal and the actively transmitted signal, wherein the center frequency of the actively transmitted signal is (the center frequency of the carrier signal + the frequency offset between the carrier signal and the actively transmitted signal); then, based on the center frequency of the actively transmitted signal, the frequency domain position of the actively transmitted signal is determined. For example, the bandwidth of the active transmission signal is W MHz, the center frequency of the carrier signal is C1, and the frequency offset between the carrier signal and the active transmission signal is f2; the center frequency of the active transmission signal is (C1+f2), and the frequency domain position of the active transmission signal is [C1+f2-M / 2, C1+f2+M / 2], where C1, f2, and M are real numbers greater than 0.

[0151] Method 2: The third frequency domain information is used to indicate the active transmission bandwidth (a bandwidth, such as 5MHz) and / or the protection bandwidth (a bandwidth, such as 5MHz). The above-mentioned protection bandwidth is the protection interval between two adjacent active transmission bandwidths, and the above-mentioned active transmission bandwidth is the bandwidth occupied by the active transmission signal. Considering that the first terminal device supports active transmission, this application adopts frequency shift design to realize frequency division multiplexing of frequency domain resources. In multiplexing Figure 3, the width of each black area is equal to the active transmission bandwidth, and the width of each white area is equal to the protection bandwidth. Exemplarily, the third frequency domain information is used to indicate that the active transmission bandwidth is Y MHz, the protection bandwidth is Z MHz, and the reference frequency. The protocol supported by the first node and the first terminal device defines the division of frequency domain resources. The reference frequency can be the frequency corresponding to the lower boundary of a certain protection bandwidth (such as the first protection bandwidth from bottom to top in Figure 3), the center frequency of the carrier signal, the edge of the carrier signal bandwidth (upper boundary / lower boundary), or other frequency points, which are not limited in this application. In this example, when the reference frequency is the frequency corresponding to the lower boundary of a certain guard bandwidth (e.g., the first guard bandwidth from bottom to top in Figure 3), the first terminal device defines the division of frequency domain resources based on the third frequency domain information and the supported protocol (see Figure 3), and can determine that the frequency domain positions of the three actively transmitted signals are [C+Z, C+Z+Y], [C+2*Z+Y, C+2*Z+2*Y], and [C+3*Z+2*Y, C+3*Z+3*Y], where C is the reference frequency. C, Y, and Z are all real numbers greater than 0. In this example, when the reference frequency is the center frequency of the carrier signal, the first terminal device defines the division of frequency domain resources based on the third frequency domain information and the supported protocol (see Figure 3), and can determine that the frequency domain positions of the three actively transmitted signals are [C+X / 2+V, C+X / 2+V+Y], [C+X / 2+V+Y+Z, C+X / 2+V+2*Y+Z], [C+X / 2+V+2*Y+2*Z, C+X / 2+V+3*Y+2*Z], where C is the reference frequency, X is the carrier signal bandwidth, and V is the bandwidth between the upper boundary of the carrier signal bandwidth and the lower boundary of the lowest frequency backscatter bandwidth. V and X can be specified by the protocol and can be indicated by the second frequency domain information. In this example, when the reference frequency point is the upper boundary (edge) of the carrier signal bandwidth, the first terminal device defines the division of frequency domain resources based on the third frequency domain information and the supported protocol (see Figure 3), and can determine that the frequency domain positions of the three actively transmitted signals are [C+V, C+V+Y], [C+V+Y+Z, C+V+2*Y+Z], [C+V+2*Y+2*Z, C+V+3*Y+2*Z], where C is the reference frequency point and V is the bandwidth between the upper boundary of the carrier signal bandwidth and the lower boundary of the lowest frequency backscatter bandwidth. V and X can be specified by the protocol and can be indicated by the second frequency domain information. C, Y, Z, V, and X are all real numbers greater than or equal to 0.The embodiments of the present application do not limit the values ​​of C, Y, Z, V, and X. For example, the third frequency domain information is used to indicate that the active transmission bandwidth is Y MHz, and the protocol supported by the first node and the first terminal device defines the division of frequency domain resources, the protection bandwidth is Z MHz, and the reference frequency.

[0152] Mode three, the third frequency domain information is used to indicate the second index, and the above-mentioned second index indicates any of the following items: a frequency offset in the second frequency offset list, an active transmission bandwidth in the active transmission bandwidth list, a frequency point position in multiple second absolute frequency points, a frequency offset in the above-mentioned second frequency offset list represents the frequency offset between the carrier signal and the active transmission signal, an active transmission bandwidth in the above-mentioned active transmission bandwidth list represents the bandwidth occupied by the active transmission signal, and a frequency point position in the above-mentioned multiple second absolute frequency points is the frequency point position of the above-mentioned active transmission signal (i.e., the center frequency point of the active transmission signal). The second frequency offset list can be specified by the protocol supported by the first node and the first terminal device, or it can be configured by the first node to the first terminal device through signaling. The active transmission bandwidth list can be specified by the protocol supported by the first node and the first terminal device, or it can be configured by the first node to the first terminal device through signaling. The above-mentioned multiple second absolute frequency points can be specified by the protocol supported by the first node and the first terminal device. Table 3 shows an example of the second frequency offset list. The first column in Table 3 is the value of the second index, and the second column is the frequency offset between the carrier signal and the active transmission signal. The number of values ​​of the second index in Table 3 is not limited.

[0153] Table 3

[0154] Exemplarily, the second index indicates a frequency offset in the second frequency offset list; for example, when the value of the second index is 0, the second index indicates frequency offset #1. Based on the second index, the first terminal device can determine the center frequency of an actively transmitted signal as: the center frequency of the carrier signal + frequency offset #1; based on the center frequency and bandwidth of the actively transmitted signal, determine the frequency domain position of the actively transmitted signal. The actively transmitted bandwidth list may include frequency band ranges of multiple actively transmitted bandwidths. Table 4 shows an example of an actively transmitted bandwidth list. The number of values ​​of the second index in Table 4 is not limited.

[0155] Table 4

[0156] Exemplarily, the second index indicates an active transmission bandwidth in the active transmission bandwidth list. For example, when the value of the second index is 1, the second index indicates frequency band range #2. Based on the second index, the first terminal device can determine that the frequency band range of an active transmission bandwidth is frequency band range #2. Exemplarily, the second index indicates a frequency point position among multiple second absolute frequency points, such as frequency point position 2. Based on the second index, the first terminal device can determine that the center frequency point of an active transmission signal is frequency point position 2; then, based on frequency point position 2, the frequency domain position of the active transmission signal is determined. The bandwidth of the active transmission signal can be specified by the protocol. For example, the bandwidth of the backscattered signal is X2, and the frequency domain position of the backscattered signal is [frequency point position 2-X2 / 2, frequency point position 2+X2 / 2], where X2 is a real number greater than 0.

[0157] Mode 4: The third frequency domain information includes a second square wave sequence, and the second square wave sequence indicates a frequency offset between the carrier signal and the actively transmitted signal.

[0158] In one possible implementation, the first information is included in a preamble sequence or a synchronization signal, and the third frequency domain information in the first information includes a second square wave sequence. Exemplarily, the second square wave sequence is {0, 1, 0, 1, 0, 1, ...}, and the frequency of the second square wave sequence is Δf, which is the frequency offset (or frequency shift frequency) between the carrier signal and the actively transmitted signal. The first terminal device can determine the frequency offset between the carrier signal and the actively transmitted signal based on the second square wave sequence; then, based on the frequency offset and the center frequency of the carrier signal, determine the center frequency of the actively transmitted signal; based on the center frequency of the actively transmitted signal and the bandwidth of the actively transmitted signal, determine the frequency domain position of the actively transmitted signal.

[0159] Mode 5: The third frequency domain information includes a second time interval, and the second time interval is used to determine the frequency offset (or frequency shift frequency) between the carrier signal and the actively transmitted signal.

[0160] The second time interval can be understood as the duration of a level state corresponding to the second square wave sequence in Mode 2. The first terminal device can determine the frequency offset between the carrier signal and the actively transmitted signal based on the second time interval; then, based on the frequency offset and the center frequency of the carrier signal, determine the center frequency of the actively transmitted signal; and based on the center frequency of the actively transmitted signal and the bandwidth of the actively transmitted signal, determine the frequency domain position of the actively transmitted signal.

[0161] Method six: The third frequency domain information is the second preamble sequence, and the second preamble sequence is used to determine the second offset. The above-mentioned second offset represents the frequency offset between the carrier signal and the actively transmitted signal. Exemplarily, the third frequency domain information is the second preamble sequence, and the second preamble sequence corresponds to the second offset. The first terminal device can determine the second offset based on the second preamble sequence; then, based on the frequency offset and the center frequency of the carrier signal, determine the center frequency of the actively transmitted signal; based on the center frequency of the actively transmitted signal and the bandwidth of the actively transmitted signal, determine the frequency domain position of the actively transmitted signal.

[0162] The idea of ​​the sixth method is to design different preamble sequences corresponding to different frequency domain positions of the active transmission signal, that is, to implicitly indicate the frequency offset between the carrier signal and the active transmission signal by using different preamble sequences.

[0163] In one possible implementation, the first information includes the second frequency domain information and the third frequency domain information, that is, the second frequency domain information and the third frequency domain information each independently indicate frequency offset information. When the first terminal device supports both active transmission and backscatter transmission, the first node sends the first information containing at least the second frequency domain information and the third frequency domain information. Optionally, the second frequency domain information is used to indicate the backscatter bandwidth, and the third frequency domain information is used to indicate the active transmission bandwidth and the protection bandwidth. Optionally, the second frequency domain information is used to indicate the backscatter bandwidth and the protection bandwidth, and the third frequency domain information is used to indicate the active transmission bandwidth. The protection bandwidth is the protection interval between two adjacent bandwidths, the active transmission bandwidth is the bandwidth occupied by the active transmission signal, and the backscatter bandwidth is the bandwidth occupied by the backscatter signal. If active transmission and backscatter transmission are supported simultaneously in the same frequency band, the first node needs to indicate the active transmission bandwidth and the backscatter bandwidth, and give specific configuration information of different transmission bandwidths, for example: "active transmission bandwidth-protection interval-backscatter bandwidth-protection interval-backscatter bandwidth" etc. Considering that active transmission and backscatter transmission are supported simultaneously in the same frequency band, the present application adopts frequency shift design to realize frequency division multiplexing of frequency domain resources. Figure 4 is a schematic diagram of another frequency domain resource division provided by an embodiment of the present application. As shown in Figure 4, the horizontal line filling area is the position of the carrier signal, that is, the carrier signal bandwidth, the white area is the protection bandwidth, a black area is a backscatter bandwidth, the vertical line area is the active transmission bandwidth, and the oblique line area is not limited. There are two backscatter bandwidths in Figure 4. The frequency domain offsets of the center frequency points of the two backscatter signals and the center frequency point of the carrier signal are frequency offset 4 and frequency offset 5, and the frequency domain offsets of the center frequency point of the active transmission signal and the center frequency point of the carrier signal are frequency offset 6. In a possible implementation, the active transmission bandwidth can also be considered to be located in the above-mentioned oblique line area, or overlap with the backscatter bandwidth. When the first terminal device supports active transmission or backscatter transmission, the other transmission mode can be disabled by indication. Referring to Figure 4, the width of the white area is equal to the protection bandwidth, the width of each black area is equal to the backscatter bandwidth, and the width of the vertical line area is equal to the active transmission bandwidth. Exemplarily, the third frequency domain information is used to indicate that the active transmission bandwidth is Y MHz, the protection bandwidth is Z MHz, the backscatter bandwidth is W, and the reference frequency. The protocol supported by the first node and the first terminal device defines the division of frequency domain resources. The reference frequency can be the frequency corresponding to the lower boundary of a certain protection bandwidth (for example, the first protection bandwidth from bottom to top in Figure 4), the center frequency of the carrier signal, the edge of the carrier signal bandwidth (upper boundary / lower boundary), or other frequency points, which is not limited in this application.In this example, when the reference frequency point is the frequency point corresponding to the lower boundary of a certain protection bandwidth (for example, the first protection bandwidth from bottom to top in Figure 3), the first terminal device defines the division of frequency domain resources based on the third frequency domain information and the supported protocol (see Figure 4), and can determine that the active transmission bandwidth is [C+2*Z+W, C+2*Z+W+Y], and the two backscattering bandwidths are [C+Z, C+Z+W] and [C+3*Z+Y+W, C+3*Z+Y+2*W], where C is the reference frequency point. In this example, when the reference frequency is the center frequency of the carrier signal, the first terminal device defines the division of frequency domain resources based on the third frequency domain information and the supported protocol (see Figure 4), and can determine that the active transmission bandwidth is [C+2*Z+W, C+2*Z+W+Y], and the two backscattering bandwidths are [C+X / 2+V, C+X / 2+V+W] and [C+X / 2+V+W+Y+2*Z, C+X / 2+V+2*W+Y+2*Z], C is the reference frequency, V is the bandwidth between the upper boundary of the carrier signal bandwidth and the lower boundary of the backscattering bandwidth with the lowest frequency, V and X (carrier signal bandwidth) can be specified by the protocol and can be indicated by the third frequency domain information. C, Y, Z, W, X, V are all real numbers greater than or equal to 0. The embodiment of the present application does not limit the values ​​of C, Y, Z, W, X, V. Exemplarily, the third frequency domain information is used to indicate that the active transmission bandwidth is Y MHz, the backscatter bandwidth is W, and the protocol supported by the first node and the first terminal device defines the division of frequency domain resources, the protection bandwidth is Z MHz, and the reference frequency.

[0164] Optionally, the first node sending the first information includes: the first node sending the first information when waking up the first terminal device; or the first node sending the first information before instructing the first terminal device to perform an access process. A possible implementation of the first node sending the first information when waking up the first terminal device can be found in the embodiment shown in Figure 5. A possible implementation of the first node sending the first information before instructing the first terminal device to perform an access process can be found in the embodiment shown in Figure 6.

[0165] FIG5 is a flow chart of another communication method provided by an embodiment of the present application. As shown in FIG5 , the method includes:

[0166] 501. When waking up a first terminal device, the first node sends first information to the first terminal device.

[0167] Correspondingly, the first terminal device receives the first information. In one possible implementation, the first node charges the AIoT devices (including the first terminal device) in the surrounding environment; when the duration of the first node charging the AIoT devices (including the first terminal device) in the surrounding environment reaches a preset duration, it is assumed that all AIoT devices in the surrounding environment are awakened, and the first information is sent at this time. Waking up the first terminal device can be when the duration of the first node charging the AIoT devices (including the first terminal device) in the surrounding environment reaches a preset duration. The preset duration can be set according to actual needs and is not limited in the embodiments of the present application. The first terminal device can be any AIoT device in the surrounding environment of the first node; step 501 can be replaced by: when the duration of the first node charging the AIoT devices in the surrounding environment reaches a preset duration, the first information is sent in a broadcast form, or when the duration of the first node sending the wake-up signal reaches a preset duration, the first information is sent in a broadcast form. The operations performed by each AIoT device in the surrounding environment of the first node are similar to those of the first terminal device. For the convenience of description, the first terminal device is taken as an example here. Step 501 may be replaced by: before instructing the first terminal device to perform an access process, the first node sends first information so that the first terminal device determines the frequency domain resources used for its transmission based on the first information.

[0168] 502. The first terminal device determines the frequency domain position of the backscattered signal based on the first information.

[0169] Exemplarily, the first information includes first frequency domain information and second frequency domain information, the first frequency domain information is used to determine the frequency domain position of the carrier signal, and the second frequency domain information is used to determine the frequency offset between the carrier signal and the backscattered signal; the first terminal device determines the frequency domain position of the carrier signal based on the first frequency domain information, such as the center frequency point of the carrier signal or the edge of the carrier signal bandwidth; then, the first terminal device determines the frequency domain position of the backscattered signal based on the frequency domain position of the carrier signal and the frequency offset.

[0170] Exemplarily, the first information includes second frequency domain information, and the second frequency domain information is used to indicate the backscatter bandwidth and / or protection bandwidth, and the above-mentioned protection bandwidth is the protection interval between two adjacent backscatter bandwidths; the first terminal device determines the frequency domain position of the backscatter signal based on the second frequency domain information.

[0171] Exemplarily, the first information includes second frequency domain information, and the second frequency domain information is used to indicate the above-mentioned first index, and the first index indicates any one of the following items: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, and a frequency point position in multiple first absolute frequency points. A frequency offset in the above-mentioned first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the above-mentioned backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the above-mentioned multiple first absolute frequency points is the frequency point position of the above-mentioned backscatter signal (that is, the center frequency point of the backscatter signal); the first terminal device determines the frequency domain position of the backscatter signal based on the first index.

[0172] 503. The first node sends a first signal to the first terminal device.

[0173] The first signal is a carrier signal.

[0174] Correspondingly, the first terminal device receives the first signal.

[0175] 504. The first terminal device performs backscatter transmission based on the frequency domain position of the backscatter signal and the first signal.

[0176] In one possible implementation, the first terminal device may use backscatter frequency shift technology to perform backscatter transmission based on the frequency domain position of the backscatter signal and the first signal. For example, the first terminal device is internally deployed with a backscatter implementation circuit, and the signal S output by the backscatter implementation circuit is out The excitation signal S in (ie, the received signal) is frequency-shifted upward and downward by f0, respectively. Step 504 can be implemented with mature technology in the art and will not be described in detail here.

[0177] Step 503 and step 504 are optional. After the first terminal device determines the frequency domain position of the backscattered signal based on the first information, it may perform other operations, which are not limited in this embodiment of the present application.

[0178] In an embodiment of the present application, the first node sends the first information to the first terminal device when waking up the first terminal device; after waking up, the first terminal device performs backscatter transmission based on the frequency domain position of the backscatter signal and the first signal; subsequent communications can directly use the frequency domain position of the backscatter signal determined by the first information, saving signaling overhead.

[0179] FIG6 is a flow chart of another communication method provided by an embodiment of the present application. The method flow in FIG6 is an example of the method described in FIG2. FIG6 describes, based on FIG2, when the first information is sent. It should be understood that the method flow in FIG6 is only one possible example, and the present application does not limit when the first information is sent. As shown in FIG6, the method includes:

[0180] 601. A first node sends first information in a broadcasting manner.

[0181] Correspondingly, the AIoT devices (including the first terminal device) in the surrounding environment of the first node receive the first information from the first node. The operations performed by each AIoT device in the surrounding environment of the first node are similar to those of the first terminal device. For ease of description, this embodiment is introduced using the first terminal device as an example.

[0182] 602. The first terminal device determines the frequency domain position of the backscattered signal based on the first information.

[0183] 603. The first node sends second information.

[0184] The second information is used to instruct the AIoT device (including the first terminal device) to perform the access process. Optionally, the second information is also used to indicate the time and frequency resources available for the AIoT device to perform the access process. The second information may also carry other information related to the access process, which is not limited here. In one possible implementation, the first node sends the second information in a broadcast form. In one possible implementation, the first node sends the second information to the first terminal device in a unicast form.

[0185] 604. The first terminal device performs an access process based on the second information.

[0186] 605. The first node sends a first signal to the first terminal device.

[0187] The first signal is a carrier signal.

[0188] Correspondingly, the first terminal device receives the first signal.

[0189] 606. The first terminal device performs backscatter transmission based on the frequency domain position of the backscatter signal and the first signal.

[0190] Steps 603 to 606 are optional. After the first terminal device determines the frequency domain position of the backscattered signal based on the first information, it may perform other operations, which are not limited in this embodiment of the present application.

[0191] In an embodiment of the present application, the first node broadcasts the first information before sending the second information, so that the first terminal device can determine the frequency domain location of the backscattered signal based on the first information. The first node no longer sends the first information during the access process of the first terminal device, thereby saving signaling overhead.

[0192] The following describes the structure of a communication device that can implement the communication method provided in the embodiments of the present application in conjunction with the accompanying drawings. The following only briefly describes the communication device. For details on the implementation of the solution, please refer to the description of the method embodiment above, which will not be repeated below.

[0193] Figure 7 is a schematic diagram of the structure of a communication device 700 provided in an embodiment of the present application. The communication device 700 can implement the functions or steps implemented by the first node in each of the above-mentioned method embodiments, or can also implement the functions or steps implemented by the first terminal device in each of the above-mentioned method embodiments. The communication device may include a processing module 710 and a transceiver module 720. In one possible implementation, it may also include a storage unit, which can be used to store instructions (code or program) and / or data. The processing module 710 and the transceiver module 720 can be coupled to the storage unit. For example, the processing module 710 can read the instructions (code or program) and / or data in the storage unit to implement the corresponding method. The above-mentioned units can be provided independently or partially or fully integrated. For example, the transceiver module 720 may include a transmitting module and a receiving module. The transmitting module may be a transmitter, and the receiving module may be a receiver. The entity corresponding to the transceiver module 720 may be a transceiver circuit, such as a transceiver or a communication interface.

[0194] In some possible implementations, the communication device 700 can implement the behaviors and functions of the first node in the above-described method embodiments. For example, the communication device 700 can be the first node, or it can be a component (such as a chip or circuit) used in the first node. The transceiver module 720 can be used to perform all receiving or sending operations performed by the first node in the embodiments of Figures 2, 5, and 6. The processing module 710 can be used to perform all operations performed by the first node in the embodiments of Figures 2, 5, and 6 except for the transceiver operations.

[0195] In some possible implementations, the communication device 700 can implement the behaviors and functions of the first terminal device in the above-described method embodiments. For example, the communication device 700 can be the first terminal device, or it can be a component (such as a chip or circuit) used in the first terminal device. The transceiver module 720 can, for example, be used to perform all receiving or sending operations performed by the first terminal device in the embodiments of Figures 2, 5, and 6. The processing module 710 can, for example, be used to perform all operations performed by the first terminal device in the embodiments of Figures 2, 5, and 6 except for the receiving and sending operations.

[0196] The present application further provides an apparatus 800, which may be a network device (eg, a base station) or a terminal device, or a chip. The apparatus 800 may be configured to execute the operations performed by the first node in the embodiments shown in FIG. 2 , FIG. 5 , or FIG. 6 .

[0197] When the apparatus 800 is a network device, such as a base station, FIG8 shows a simplified schematic diagram of a base station structure. The base station includes parts 810, 820, and 830.

[0198] Part 810 is mainly used for baseband processing, base station control, etc.; Part 810 is usually the control center of the base station, which can usually be called a processor, and is used to control the base station to perform the processing operations of the base station in the above method embodiment.

[0199] The 820 part is mainly used to store computer program code and data.

[0200] Part 830 is mainly used for receiving and transmitting radio frequency signals and converting radio frequency signals into baseband signals. Part 830 can generally be referred to as a transceiver module, transceiver, transceiver circuit, or transceiver. The transceiver module of part 830 can also be referred to as a transceiver or transceiver, etc. It includes an antenna and a radio frequency circuit (not shown in the figure), wherein the radio frequency circuit is mainly used for radio frequency processing. Optionally, the device used to implement the receiving function in part 830 can be regarded as a receiver, and the device used to implement the transmitting function can be regarded as a transmitter, that is, part 830 includes a receiver 832 and a transmitter 831. The receiver can also be referred to as a receiving module, a receiver, or a receiving circuit, etc., and the transmitter can be referred to as a transmitting module, a transmitter, or a transmitting circuit, etc.

[0201] Sections 810 and 820 may include one or more boards, each of which may include one or more processors and one or more memories. The processor is used to read and execute programs in the memory to implement baseband processing functions and control the base station. If multiple boards are present, the boards may be interconnected to enhance processing capabilities. As an optional implementation, multiple boards may share one or more processors, multiple boards may share one or more memories, or multiple boards may simultaneously share one or more processors.

[0202] For example, in one implementation, the transceiver module in section 830 is configured to execute the transceiver-related processes performed by the first node in the embodiments shown in FIG2 , FIG5 , or FIG6 . The processor in section 810 is configured to execute the processing-related processes performed by the first node in the embodiments shown in FIG2 , FIG5 , or FIG6 .

[0203] It should be understood that FIG8 is merely an example and not a limitation, and the network device including the processor, memory, and transceiver may not rely on the structure shown in FIG8 .

[0204] When device 800 is a chip, the chip includes a transceiver, a memory, and a processor. The transceiver can be an input / output circuit or a communication interface; the processor can be a processor, microprocessor, or integrated circuit integrated on the chip. The sending operation of the first node in the above method embodiment can be understood as an output of the chip, and the receiving operation of the first node in the above method embodiment can be understood as an input of the chip.

[0205] The present application further provides an apparatus 900, which may be a terminal device, a processor in the terminal device, or a chip. The apparatus 900 may be used to execute the operations executed by the first terminal device in the above method embodiment.

[0206] When the apparatus 900 is a terminal device, FIG9 shows a simplified schematic diagram of the structure of the terminal device. As shown in FIG9 , the terminal device includes a processor, a memory, and a transceiver. The memory can store computer program code, and the transceiver includes a transmitter 931, a receiver 932, a radio frequency circuit (not shown in the figure), an antenna 933, and an input / output device (not shown in the figure). As shown in FIG9 , the terminal device includes a processor 910, a memory 920, and a transceiver 930. The processor 910 may also be referred to as a processing unit, a processing board, a processing module, or a processing device. The transceiver 930 may also be referred to as a transceiver unit, a transceiver, or a transceiver device.

[0207] Optionally, the device used to implement the receiving function in transceiver 930 is considered a receiving module, and the device used to implement the transmitting function in transceiver 930 is considered a transmitting module. That is, transceiver 930 includes a receiver and a transmitter. A transceiver may also be sometimes referred to as a transceiver, a transceiver module, or a transceiver circuit. A receiver may also be sometimes referred to as a receiver, a receiving module, or a receiving circuit. A transmitter may also be sometimes referred to as a transmitter, a transmitting module, or a transmitting circuit.

[0208] The processor is mainly used to process communication protocols and communication data; control terminal devices, execute software programs and process software program data, etc.

[0209] Memory is mainly used to store software programs and data.

[0210] Radio frequency circuits are mainly used for conversion between baseband signals and radio frequency signals and for processing radio frequency signals.

[0211] Antennas are mainly used to send and receive radio frequency signals in the form of electromagnetic waves.

[0212] The input and output device may include a touch screen, a display screen, or a keyboard. The input and output device is mainly used to receive data input by the user and output data to the user. It should be noted that some types of terminal devices may not have input and output devices.

[0213] When data needs to be sent, the processor performs baseband processing on the data to be sent and outputs the baseband signal to the RF circuit. The RF circuit then performs RF processing on the baseband signal and transmits the RF signal to the outside in the form of electromagnetic waves through the antenna. When data is sent to the terminal device, the RF circuit receives the RF signal through the antenna. The RF circuit converts the RF signal into a baseband signal and outputs the baseband signal to the processor. The processor converts the baseband signal into data and processes the data. For ease of explanation, Figure 9 shows only one memory, processor, and transceiver. In actual terminal device products, there may be one or more processors and one or more memories. The memory may also be referred to as a storage medium or a storage device, etc. The memory may be set independently of the processor or integrated with the processor, and this embodiment of the application does not limit this.

[0214] In the embodiment of the present application, the antenna and radio frequency circuit with transceiver functions can be regarded as the transceiver module of the terminal device, and the processor with processing function can be regarded as the processing module of the terminal device.

[0215] In one possible implementation, the processor 910 is configured to execute the processing actions of the first terminal device in the embodiments shown in Figures 2, 5, and 6. The transceiver 930 is configured to execute the transceiver actions of the first terminal device in the embodiments shown in Figures 2, 5, and 6.

[0216] It should be understood that FIG9 is merely an example and not a limitation, and the terminal device including the transceiver module and the processing module may not rely on the structure shown in FIG9 .

[0217] When the apparatus 900 is a chip, the chip includes a processor, a memory, and a transceiver. The transceiver may be an input / output circuit or a communication interface. The processor may be a processing module, a microprocessor, or an integrated circuit integrated on the chip. In the above method embodiment, the sending operation of the first terminal device may be understood as an output of the chip, and the receiving operation of the first terminal device in the above method embodiment may be understood as an input of the chip.

[0218] This application also provides a computer-readable storage medium storing a computer program or instructions. When the computer program or instructions are executed on a computer, the computer executes the method of the above embodiment. For example, when the computer program is executed by a computer, the computer can implement the method performed by the first node or the first terminal device in the above method embodiment.

[0219] The present application also provides a computer program product, which includes a computer program or instructions. When the computer program or instructions are run on a computer, the method in the above embodiment is executed.

[0220] The present application also provides a communication system, comprising the above-mentioned first node and the above-mentioned first terminal device.

[0221] The present application also provides a chip, which includes: a communication interface and a processor; the communication interface is used for sending and receiving signals of the above-mentioned chip; the processor is used to execute a computer program or instruction so that the first node or first terminal device including the above-mentioned chip executes the method in the above-mentioned embodiment.

[0222] An embodiment of the present application also provides a chip device, including a processor, for calling a computer program or computer instruction stored in the memory so that the processor executes the method provided in the embodiment shown in the above-mentioned first node or first terminal device.

[0223] Optionally, the processor is coupled to the memory via an interface.

[0224] Optionally, the chip device further includes a memory, in which a computer program or computer instructions are stored.

[0225] The processor mentioned in any of the above may be a general-purpose central processing unit, a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of the program of the method provided in any of the embodiments shown in the terminal device. The memory mentioned in any of the above may be a read-only memory (ROM) or other type of static storage device that can store static information and instructions, a random access memory (RAM), etc.

[0226] Those skilled in the art can clearly understand that, for the sake of convenience and brevity of description, the explanation of the relevant contents and beneficial effects of any of the above-mentioned devices can refer to the corresponding method embodiments provided above, and will not be repeated here.

[0227] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the above units is only 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 an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0228] The units described above 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 according to actual needs to achieve the purpose of the solution of this embodiment.

[0229] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0230] If the above-mentioned 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 part that essentially contributes to the technical solution of the present application or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several computer programs or instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the above-mentioned methods of each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as USB flash drives, mobile hard drives, ROM, RAM, magnetic disks or optical disks.

[0231] The above 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 above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

[0232] In the above embodiments, all or part of the embodiments may be implemented using software, hardware, firmware, or any combination thereof. When implemented using software, all or part of the embodiments may be implemented in the form of a computer program product. The computer program product includes one or more computer programs or instructions. When the computer program or instructions are loaded and executed on a computer, the processes or functions described in the embodiments of the present application are performed in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, a network device, a user device, or other programmable device. The computer program or instructions may be stored in a computer-readable storage medium or transferred from one computer-readable storage medium to another. For example, the computer program or instructions may be transferred from one website, computer, server, or data center to another website, computer, server, or data center via wired or wireless means. The computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or data center that integrates one or more available media. The available medium may be a magnetic medium, such as a floppy disk, hard disk, or magnetic tape; an optical medium, such as a digital video disk; or a semiconductor medium, such as a solid-state drive. The computer-readable storage medium may be a volatile or nonvolatile storage medium, or may include both volatile and nonvolatile types of storage media.

[0233] In the various embodiments of the present application, unless otherwise specified or there is any logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced by each other. The technical features in different embodiments can be combined to form new embodiments according to their inherent logical relationships.

Claims

1. A communication method, characterized in that: include: Send first information, where the first information is used to indicate the frequency domain resources used for transmission by the first terminal device, and the first information includes one or more of first frequency domain information, second frequency domain information, and third frequency domain information. The first frequency domain information is used to determine the frequency domain position or center frequency of the carrier signal, the second frequency domain information is used to determine the frequency domain position of the backscattered signal, and the third frequency domain information is used to determine the frequency domain position of the actively transmitted signal.

2. The method according to claim 1, characterized in that The first information includes the second frequency domain information; The second frequency domain information is used to indicate a frequency offset between the carrier signal and the backscattered signal; or, The second frequency domain information is used to indicate a backscatter bandwidth and / or a guard bandwidth, where the guard bandwidth is a guard interval between two adjacent backscatter bandwidths, and the backscatter bandwidth is a bandwidth occupied by a backscatter signal; or The second frequency domain information is used to indicate a first index, and the first index indicates any one of the following items: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, and a frequency point position in multiple first absolute frequency points. A frequency offset in the first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the multiple first absolute frequency points is the frequency point position of the backscatter signal.

3. The method according to claim 1, characterized in that The first information includes the second frequency domain information; The second frequency domain information is used to indicate a frequency division ratio of a basic clock frequency.

4. The method according to claim 1, wherein The first information includes the second frequency domain information; The first information is included in a preamble sequence or a synchronization signal, and the second frequency domain information includes a first square wave sequence, where the first square wave sequence indicates a frequency offset between a carrier signal and a backscattered signal; or The second frequency domain information is used to indicate a first time interval, and the first time interval is used to determine a frequency offset between a carrier signal and a backscattered signal.

5. The method according to claim 1, wherein The first information includes the second frequency domain information, the second frequency domain information is a first preamble sequence, the first preamble sequence is used to determine a first offset, and the first offset represents a frequency offset between a carrier signal and a backscattered signal.

6. The method according to claim 1, characterized in that The first information includes the third frequency domain information; The third frequency domain information is used to indicate the offset between the carrier signal and the actively transmitted signal; or, The third frequency domain information is used to indicate the active transmission bandwidth and / or the protection bandwidth, where the protection bandwidth is the guard interval between two adjacent active transmission bandwidths, and the active transmission bandwidth is the bandwidth occupied by the active transmission signal; or The third frequency domain information is used to indicate a protection bandwidth, an active transmission bandwidth, and a backscattering bandwidth, wherein the protection bandwidth is a protection interval between two adjacent bandwidths, the active transmission bandwidth is a bandwidth occupied by an active transmission signal, and the backscattering bandwidth is a bandwidth occupied by a backscattering signal; or The third frequency domain information is used to indicate a second index, and the second index indicates any one of the following items: a frequency offset in the second frequency offset list, an active transmission bandwidth in the active transmission bandwidth list, and a frequency point position in multiple second absolute frequency points. A frequency offset in the second frequency offset list represents the frequency offset between the carrier signal and the active transmission signal, an active transmission bandwidth in the active transmission bandwidth list represents the bandwidth occupied by the active transmission signal, and a frequency point position in the multiple second absolute frequency points is the frequency point position of the active transmission signal.

7. The method according to claim 1, characterized in that The first information includes the third frequency domain information; The first information is included in a preamble sequence or a synchronization signal, the third frequency domain information includes a second square wave sequence, and the second square wave sequence indicates a frequency offset between a carrier signal and an actively transmitted signal; or The third frequency domain information is used to indicate a second time interval, and the second time interval is used to determine a frequency offset between a carrier signal and an actively transmitted signal.

8. The method according to claim 1, characterized in that The first information includes the third frequency domain information, the third frequency domain information is a second preamble sequence, the second preamble sequence is used to determine a second offset, and the second offset represents an offset between a carrier signal and an actively transmitted signal.

9. The method according to any one of claims 1 to 8, characterized in that The first information is sent in a broadcast form, and the first information carries available frequency domain information for responding to the first information; Alternatively, the first information is information that limits the use of the first terminal device.

10. The method according to any one of claims 1 to 9, characterized in that The sending of the first information includes: When waking up the first terminal device, sending the first information; Alternatively, the first information is sent before instructing the first terminal device to perform the access process.

11. A communication method, characterized in that: include: Receive first information, where the first information is used to indicate frequency domain resources used for transmission by the first terminal device, the first information including one or more of first frequency domain information, second frequency domain information, and third frequency domain information, the first frequency domain information being used to determine the frequency domain position or center frequency of a carrier signal, the second frequency domain information being used to determine the frequency domain position of a backscattered signal, and the third frequency domain information being used to determine the frequency domain position of an actively transmitted signal; Transmission is performed based on the frequency domain resources indicated by the first information.

12. The method according to claim 11, characterized in that The first information includes the second frequency domain information; The second frequency domain information is used to indicate a frequency offset between the carrier signal and the backscattered signal; or, The second frequency domain information is used to indicate a backscatter bandwidth and / or a guard bandwidth, where the guard bandwidth is a guard interval between two adjacent backscatter bandwidths, and the backscatter bandwidth is a bandwidth occupied by a backscatter signal; or The second frequency domain information is used to indicate a first index, and the first index indicates any one of the following items: a frequency offset in the first frequency offset list, a backscatter bandwidth in the backscatter bandwidth list, and a frequency point position in multiple first absolute frequency points. A frequency offset in the first frequency offset list represents the frequency offset between the carrier signal and the backscatter signal, a backscatter bandwidth in the backscatter bandwidth list represents the bandwidth occupied by the backscatter signal, and a frequency point position in the multiple first absolute frequency points is the frequency point position of the backscatter signal.

13. The method according to claim 11, characterized in that The first information includes the second frequency domain information, where the second frequency domain information is used to indicate a frequency division ratio of a basic clock frequency.

14. The method according to claim 11, characterized in that The first information includes the second frequency domain information; The first information is included in a preamble sequence or a synchronization signal, and the second frequency domain information includes a first square wave sequence, where the first square wave sequence indicates a frequency offset between a carrier signal and a backscattered signal; or The second frequency domain information is used to indicate a first time interval, and the first time interval is used to determine a frequency offset between a carrier signal and a backscattered signal.

15. The method according to claim 11, characterized in that The first information includes the second frequency domain information, the second frequency domain information includes a first offset, the first offset corresponds to a first preamble sequence, and the first offset represents a frequency offset between a carrier signal and a backscattered signal.

16. The method according to claim 11, characterized in that The first information includes the third frequency domain information; The third frequency domain information is used to indicate the offset between the carrier signal and the actively transmitted signal; or, The third frequency domain information is used to indicate the active transmission bandwidth and / or the protection bandwidth, where the protection bandwidth is the guard interval between two adjacent active transmission bandwidths, and the active transmission bandwidth is the bandwidth occupied by the active transmission signal; or The third frequency domain information is used to indicate a protection bandwidth, an active transmission bandwidth, and a backscattering bandwidth, wherein the protection bandwidth is a protection interval between two adjacent bandwidths, the active transmission bandwidth is a bandwidth occupied by an active transmission signal, and the backscattering bandwidth is a bandwidth occupied by a backscattering signal; or The third frequency domain information is used to indicate a second index, and the second index indicates any one of the following items: a frequency offset in the second frequency offset list, an active transmission bandwidth in the active transmission bandwidth list, and a frequency point position in multiple second absolute frequency points. A frequency offset in the second frequency offset list represents the frequency offset between the carrier signal and the active transmission signal, an active transmission bandwidth in the active transmission bandwidth list represents the bandwidth occupied by the active transmission signal, and a frequency point position in the multiple second absolute frequency points is the frequency point position of the active transmission signal.

17. The method according to claim 11, characterized in that The first information includes the third frequency domain information; The first information is included in a preamble sequence or a synchronization signal, the third frequency domain information includes a second square wave sequence, and the second square wave sequence indicates a frequency offset between a carrier signal and an actively transmitted signal; or The third frequency domain information is used to indicate a second time interval, and the second time interval is used to determine a frequency offset between a carrier signal and an actively transmitted signal.

18. The method according to claim 11, characterized in that The first information includes the third frequency domain information, the third frequency domain information is a second preamble sequence, the second preamble sequence is used to determine a second offset, and the second offset represents an offset between a carrier signal and an actively transmitted signal.

19. The method according to any one of claims 11 to 18, characterized in that The first information is sent in a broadcast form, and the first information carries frequency domain information available in response to the first information; Alternatively, the first information is information that limits the use of the first terminal device.

20. A communication device, characterized in that: The method comprises modules for implementing the method according to any one of claims 1 to 19.

21. A communication device, characterized in that: The communication device comprises a processor coupled to a memory, the memory storing computer program instructions, and the processor is configured to execute the computer program instructions so that the communication device performs the method according to any one of claims 1 to 19.

22. A chip, characterized in that: including a communication interface for transmitting and receiving signals from the chip; and A processor, configured to execute computer program instructions so that a communication device comprising the chip performs the method according to any one of claims 1 to 19.

23. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, wherein the computer program includes program instructions. When the program instructions are executed, the method according to any one of claims 1 to 19 is executed.

24. A computer program product, characterized in that When the computer program product is run on a computer, the computer is caused to perform the method according to any one of claims 1 to 19.

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