Abstract: A signal sending method, a signal receiving method, and a communication apparatus. A first device sends a first signal to a second device on a first frequency domain unit, and sends a second signal on a second frequency domain unit. The first frequency domain unit includes a first frequency, and the second frequency unit includes a second frequency. An absolute value of a difference between the first frequency and the second frequency is related to one or more of the following: a first bandwidth, a second bandwidth, or a third bandwidth. The first bandwidth is a bandwidth occupied by the first frequency domain unit in frequency domain. The second bandwidth is a bandwidth occupied by the second frequency domain unit in frequency domain. The third bandwidth is a bandwidth occupied by a third frequency domain unit in frequency domain.

Abstract: This disclosure provides a communication method and a communication apparatus. In some aspects, a network device receives first indication information from a core network device, where the first indication information indicates the network device to trigger, after receiving uplink data from a first terminal device, a second terminal device to access the network device. After the network device receives first uplink data from the first terminal device, the network device triggers the second terminal device to access the network device. According to the method, complexity of data transmission and processing procedures of an inventory taking procedure transplanted to a cellular network can be reduced, so that an inventory taking rate of terminal devices and a communication capacity of a system are effectively improved.

Abstract: This disclosure provides a communication method, apparatus, and a storage medium. The method includes: a first device determines a first frequency unit, and communicates with a second device on the first frequency unit. A granularity of a first channel raster corresponding to the first frequency unit is less than a granularity of a second channel raster corresponding to a second frequency unit. The second frequency unit is used for communication between the first device and a third device. The first frequency unit and the second frequency unit are located in a same operating band.

Abstract: The present disclosure discloses example communications methods and apparatuses. One example method includes obtaining effective carrier indication information from a network device. An effective carrier frequency is obtained based on the effective carrier indication information, where the effective carrier indication information includes first information, second information, and third information. The first information includes first indication information, second indication information, or third indication information. The first indication information is used to indicate that carriers are not paired, the second indication information is used to indicate that carriers are paired, the third indication information is used to indicate a paired carrier frequency spacing, the second information is used to indicate a start carrier frequency, and the third information is used to indicate a frequency domain location of an effective carrier relative to a start carrier.

Abstract: This application provides a communication method, an apparatus, a device, and a storage medium. The method includes: A first device generates a first orthogonal frequency division multiplexing (OFDM) time domain signal, which occupies one subcarrier in frequency domain and is used by a second device to perform backscatter communication. The first device sends the first OFDM time domain signal to the second device. The first OFDM time domain signal occupies one subcarrier in frequency domain, such that power is concentrated on the subcarrier. When the second device performs backscatter communication based on the first OFDM time domain signal, reliability of backscatter data is improved.

Abstract: Embodiments of this application provide an identification method and apparatus. The method includes: A first device sends a first command to at least one device, where the at least one device includes a second device, the first command is used to obtain first prefix information, the first prefix information includes k bits, and k is an integer greater than or equal to 1. The first device receives a first random number from the second device, where the first random number corresponds to the first prefix information. The first device determines, based on the first random number, that the second device accesses the first device. This application provides the method for identifying the second device by the first device. This can identify the second device, and implement inventory and random access of the second device.

Abstract: An information transmission method and a communication apparatus are disclosed. The method includes: A terminal device receives a first signal sent by a first network device based on a bandwidth of the first signal, where the first signal includes N first symbols, a modulation scheme of each of the N first symbols is ASK or OOK modulation, N is a positive integer, and the first signal is an orthogonal frequency division multiplexing (OFDM) signal; the terminal device determines a duration of the first symbol, where the duration of the first symbol is one of duration of at least one first symbol that is associated with the bandwidth of the first signal; and the terminal device determines, based on the duration of the first symbol, an information bit carried in the N first symbols.

Abstract: A communication method and apparatus are provided. The method includes: A network device determines an OFDM signal, where the OFDM signal carries a first amplitude shift keying symbol, and the first amplitude shift keying symbol is an amplitude shift keying symbol ON; and generates a first signal based on the OFDM signal and N bits, where the first signal carries N second amplitude shift keying symbols in time domain, and N is a positive integer greater than or equal to 2. The network device sends the first signal. According to the foregoing method, information transmission efficiency of an amplitude shift keying modulation scheme can be improved.

Abstract: An information receiving method, an information sending method, and an apparatus are provided. The method includes at least the following: A terminal receives a first frame from a network device based on a first frequency domain width, where the first frame includes first information. The terminal determines a second frequency domain width based on the first information. The terminal receives a second frame from the network device based on the second frequency domain width, where the second frame includes second information, the second frequency domain width is used to determine transmission duration of one bit or symbol in the second information, and the second frame and the first frame are a same frame or different frames.

Abstract: This application provides resource allocation methods and apparatuses. In an implementation, a method includes: receiving, by a first apparatus from a second apparatus, a first index value in a first index value set that comprises a plurality of index values, each index value corresponds to a combination of values of a parameter in a parameter group that comprises a plurality of parameters, the first index value corresponds to a first frequency domain resource; and sending, by the first apparatus, uplink information on the first frequency domain resource.

Abstract: A communication method and apparatus. The communication method includes: a transmitting end device generates an orthogonal frequency division multiplexing (OFDM) time domain signal, where the OFDM time domain signal includes a plurality of amplitude shift keying modulation symbols arranged in time domain; and the transmitting end device sends the OFDM time domain signal to a receiving end device. According to the communication method, an OFDM time domain signal generated by a transmitting end includes a plurality of amplitude shift keying modulation symbols, so that a data transmission rate can be improved.

Abstract: This application provides a communication method, apparatus, and device, and a storage medium. The method includes: A first device determines a time domain resource starting from a start location of communication, where the time domain resource includes a first time domain resource and a second time domain resource, there is at an interval of a first interval duration between the first time domain resource and the second time domain resource, a time domain length of the first time domain resource is related to a first transmission duration, and a time domain length of the second time domain resource is a second transmission duration; and the first device communicates with a second device on the time domain resource. In this way, the first device and the second device communicate with each other in communication systems (such as an NR communication system).

Abstract: A communication method and device. The method includes: inventory indication information sent by a network device to a terminal device includes information for determining a target terminal device. The inventory indication information indicates that the network device selects the target terminal device to initiate a random access request, or the inventory indication information indicates that the network device supports the target terminal device in initiating a random access request. In this way, the network device may select, based on target terminal devices of different types, or target terminal devices having different capabilities, a target device to perform random access, thereby improving random access efficiency of a second device and performance of subsequent data transmission of the target terminal device.

Abstract: A communication method and system, and a related apparatus. The communication method is applied to the communication system including a first device and a second device. In the communication method, the first device may indicate the second device to reserve a channel resource, and the second device does not perform data transmission on the reserved channel resource. This prevents the second device from occupying channel resources for long time, to release channel resources for a cellular communication system. The first device may schedule a terminal device other than the second device by using the released channel resources. This improves data transmission efficiency.

Abstract: A signal sending method and an apparatus. The method includes: a first device sends a first signal to a second device on N orthogonal frequency division multiplexing (OFDM) symbols, where the N OFDM symbols include N1 first symbols, N is an integer greater than or equal to 1, and N1<N. The first device sends a second signal to a third device on at least one of the N1 first symbols. According to the signal sending method and the apparatus, a technology similar to radio frequency identification (RFID) and wake-up radio (WUR) can be introduced to a communication system, and network resource overheads can be reduced.

Abstract: Embodiments of the present invention provide an communications method. For example, the apparatus receives first information that indicates a first offset from a first set of offsets, wherein the first offset is an offset from a first carrier frequency that is multiple of 100 KHz, and then obtains a carrier frequency of a cell according to the first offset indicated by the first information.

Abstract: This application provides a communication method and apparatus, to resolve a problem that security is low when a tag is triggered to perform random access in a communication network. The method includes: receiving first signaling, and determining, based on the first signaling, a second mask stored at a first storage location; and performing random access when a first mask matches the second mask. The first signaling indicates the first storage location and the first mask, the first signaling carries a first mask identifier, and the first mask identifier identifies the first storage location and/or the first mask. In embodiments of this application, a correspondence between a mask identifier and a storage location and/or a correspondence between the mask identifier and a mask are/is negotiated in advance, so that a part or all of masks and storage locations can be implicitly indicated by using a mask identifier.

Abstract: This application provides a signal transmission method and an apparatus, to reduce an envelope ripple of a transmission signal. The method includes: A base station obtains a first bit sequence and maps the first bit sequence to a first modulation symbol sequence, where a value of each modulation symbol in the first modulation symbol sequence belongs to a first constellation point set, the first constellation point set includes K modulation symbols, and each of the K modulation symbols has a different amplitude. The base station sequentially performs a DFT, weighting, and an IFFT on each modulation symbol in the first modulation symbol sequence to obtain a first signal. Based on the foregoing solution, an envelope ripple of the signal generated by the base station in time domain is small. This facilitates demodulation of the transmission signal by a terminal.

Abstract: This application provides a power control method, an apparatus, and a system, to ensure a coverage area as much as possible while reducing interference to transmission in a first communication network, and reduce deployment costs and complexity of interference coordination between first devices while ensuring the coverage area. The method includes: A first device sends an excitation signal to a terminal device at a first power; and sends a communication signal to the terminal device at a second power, where the communication signal is used to bear information, and the second power is less than the first power. At least one of the first power and the second power may be indicated by a second device to the first device.

Abstract: Embodiments of this application disclose a communication method and a related apparatus. The method includes: receiving first information from an access network device; entering a first state based on the first information; receiving, in the first state, wake-up information from the access network device, and skipping receiving, in the first state, one or more pieces of the following information from the access network device: a paging message, a synchronization signal, or a system message; and leaving the first state based on the wake-up information, and receiving the one or more pieces of information from the access network device; or leaving the first state based on the wake-up information, and initiating a random access request. With the low-power first state introduced, power consumption of a terminal device is reduced.