Abstract: A communication method and apparatus are provided, and relate to the field of communication technologies, to prevent terminal devices from being repeatedly read while performing inventory on the terminal devices at a plurality of coverage levels. This reduces power consumption of the terminal devices, and improves an inventory rate. The method may include: When indicating a terminal device to perform access, a network device may also indicate an identifier of an event or a session that triggers access; the terminal device initiates access; and when receiving a second access indication triggered by a same event or session, the terminal device may determine not to make a response. In this way, the terminal device is not repeatedly read based on a same event/session/coverage level.

Abstract: Example communication methods and apparatuses are described. In one example method, a network device determines a first signal, determines a length of a modulation symbol of a second signal based on the first signal, and sends the first signal and the second signal to a terminal device. The terminal device determines the length of the modulation symbol of the second signal based on the first signal, and demodulates the second signal based on the length of the modulation symbol of the second signal. A length of a modulation symbol of the first signal is one of a plurality of lengths of modulation symbols. The first signal is a preamble signal or a signal used by the terminal device for synchronization. The second signal is a data signal after the first signal.

Abstract: This application provides a communication method and a related apparatus. The method includes a first device obtaining first information, where the first information includes at least one of condition information for accessing a first cell and resource configuration information for accessing the first cell. The first device sends the first information to a second device, where the first information is used for the second device to determine whether access to the first cell is allowed, or the first information is used for the second device to determine a first resource for accessing the first cell, and the first resource is used for the second device to communicate with the first device. According to the method, duration of waiting for access and communication by the second device in wireless communication can be reduced, power consumption during waiting for communication is reduced, and energy efficiency is improved.

Abstract: A communication method includes sending, by a network device, a first signal to a first device on a first frequency band, and receiving, by the network device, a second signal from the first device on a second frequency band or a third frequency band. The first frequency band includes a downlink frequency band of a licensed frequency division duplex (FDD) spectrum. The first signal is useable to supply energy to the first device. The second signal includes uplink data. The second frequency band includes an uplink frequency band of the licensed frequency division duplex FDD spectrum. The third frequency band includes a frequency band of an unlicensed spectrum.

Abstract: Embodiments of this application provide a communication method, apparatus, and system, and provide an access procedure in which a device actively initiates access. The communication method includes: A first device sends configuration information to a second device, where the configuration information is used by the second device to determine a first time domain resource and/or a first frequency domain resource for sending a first message when the second device actively initiates access, and the first message is used by the second device to request to access the first device. When failing to receive the first message from the second device on the first time domain resource and/or the first frequency domain resource, the first device sends a second message to the second device, where the second message indicates the second device to access the first device again.

Abstract: This application provides a communication method and apparatus, a device, and a storage medium. The method includes: performing windowing processing on a frequency-domain signal of a first signal by using a window signal, to obtain a first frequency-domain signal, where the first signal is an OFDM signal that carries M amplitude shift keying modulation symbols, and M is a positive integer, a second frequency-domain signal is a frequency-domain signal to which the first frequency-domain signal is mapped on a first frequency-domain resource, the first frequency-domain resource is an upper half or a lower half of a frequency-domain resource occupied by the first frequency-domain signal, a second signal is a time-domain signal of the second frequency-domain signal, and the second signal is an OFDM signal that carries the M amplitude shift keying modulation symbols; and sending the second signal.

Abstract: A communication method and apparatus are provided, and relate to the field of communication technologies, to support a radio frequency identification RFID system in segmenting data based on a segmentation mechanism, simplify the segmentation mechanism, and reduce segmentation overheads. The method may be applied to the RFID system. A first protocol layer of a terminal device obtains first information that indicates a transport block size. If a size of a first data packet is greater than the transport block size, the first protocol layer segments the first data packet based on the transport block size, to obtain a plurality of first segmented data packets, and sends the plurality of first segmented data packets. The first data packet is a data packet received by the first protocol layer from a previous protocol layer. A size of the first segmented data packet is less than or equal to the transport block size.

Abstract: A method and an apparatus for receiving control information of downlink data and a method and an apparatus for sending control information of downlink data are provided, to flexibly and accurately send and receive control information of downlink data, so as to improve transmission efficiency of the downlink data. A first device receives a synchronization signal from a second device, where at least one parameter of control information of downlink data is related to the synchronization signal. Then, the first device may receive the control information of the downlink data from the second device based on the at least one parameter of the control information of the downlink data. Further, the first device receives the downlink data from the second device based on the control information of the downlink data.

Abstract: This application provides a communication method, apparatus, and device, and a storage medium. The method includes: A first device receives first downlink information from a second device, where the first downlink information includes scheduling information indicating uplink transmission of the first device, a transmission parameter and/or a transmission resource of the scheduling information are/is related to second downlink information, and the second downlink information is downlink information before the first downlink information, or the second downlink information is a synchronization signal in the first downlink information. The first device sends uplink information to the first device. This implements flexible scheduling for uplink transmission, and further improves uplink resource utilization efficiency.

Abstract: This application provides a channel coding method and apparatus, including: A terminal device generates a first bit sequence, and determines a second bit sequence based on the first bit sequence, where the second bit sequence includes M bits, any bit in the last N bits in the second bit sequence has a same value as a bit that is in the first N bits in the first bit sequence and that is in one-to-one correspondence with the bit, M and N are positive integers, and M is greater than N; performs convolutional coding on the second bit sequence based on a convolutional encoder, to obtain a third bit sequence, where an initial value of a shift register of the convolutional encoder is equal to values of the last N bits in the second bit sequence, and the convolutional encoder includes N shift registers; and sends the third bit sequence.

Abstract: A method includes receiving, by a first device, first signaling from a second device, wherein the first signaling is useable to indicate that the second device successfully received first identity information from the first device and is useable to indicate to the first device to send second identity information to the second device, the first signaling comprises a first inventory identifier, and the first inventory identifier is useable to indicate an identifier of an ongoing inventory process of the second device. The method further includes determining, by the first device based on the first signaling, that the first inventory identifier is the same as a second inventory identifier, wherein the second inventory identifier is useable to indicate an identifier of an ongoing inventory process of the first device. The method further includes sending, by the first device, the second identity information to the second device.

Abstract: A synchronization method includes generating, by a first device, a synchronization by way of orthogonal frequency division multiplexing (OFDM). The synchronization signal includes one or more of a first signal or a second signal. The first signal is used to determine a time domain start position occupied by data sent by the first device to a second device. The second signal is used to determine a frequency at which the second device sends data to the first device. The synchronization method also includes sending, by the first device, the synchronization signal to the second device.

Abstract: This application provides a paging method and an apparatus. In the paging method, a first core network device sends first signaling to a first device, indicating to the first device to page a terminal device. The first device may send second signaling, where the second signaling may indicate information about a first flag. The information about the first flag indicates that a type of a flag of a to-be-paged terminal device is a first type and/or a state of the flag is a first state, to determine the to-be-paged terminal device. In this way, a mechanism for paging the terminal device is provided, and there is no need to determine which terminal device is to be paged. This helps simplify the process of paging the terminal device.

Abstract: This application provides a communication method and a communication apparatus. In the method, M amplitude shift keying modulation symbols included in a first signal sent by a signal sending device are the same as M amplitude shift keying modulation symbols included in a second signal. In addition, bandwidth occupied by a first frequency domain signal of the first signal in frequency domain is half of that occupied by a second frequency domain signal of the second signal in frequency domain. In addition, the first signal is one OFDM symbol in time domain, and duration of the M amplitude shift keying modulation symbols carried by the first signal is the same as that of the M amplitude shift keying modulation symbols carried by the second signal.

Abstract: A communication method and apparatus are provided. The method includes: A network device sends first signaling, indicating a terminal device to initiate random access on a first random access occasion; after receiving the first signaling, if the terminal device cannot complete the random access or data transmission after the random access, for example, stored energy of the terminal device is insufficient, the terminal device may send first indication information to the network device, indicating that a first terminal device cannot complete the random access or data transmission after the random access; and after receiving the first indication information, the network device may send second signaling, indicating the terminal device to initiate random access on a next random access occasion (namely, a second random access occasion) after the first random access occasion.

Abstract: A power control method and apparatus, and a computer-readable storage medium. The method includes: A second device determines first indication information, and the second device can send the first indication information to a first device. Correspondingly, the first device may receive the first indication information from the second device, the first device may determine a first transmit power based on the first indication information, and the first device may send a signal at the first transmit power. The first transmit power is less than or equal to a maximum transmit power of the first device. The second device may control a transmit power of the first device by sending the first indication information to the first device, so that the transmit power of the first device is less than or equal to the maximum transmit power.

Abstract: The technology of this application relates to a paging method and an apparatus. A first device sends first signaling used to page a terminal device. The first signaling includes memory information or an identifier of the terminal device, to indicate the to-be-paged terminal device. In addition, the terminal device may further determine a first resource based on the first signaling, to send uplink data by using the first resource. The first device may also receive, on the first resource, the uplink data from the terminal device. The terminal device may determine the first resource based on the first signaling is equivalent to the first device allocating a resource to the terminal device. In this way, steps needing to be performed for data transmission between the terminal device and the first device are reduced.

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.