Abstract: Embodiments of this application provide a solution for network and terminal devices that have inconsistent understandings of retransmission scheduled by using downlink control information (DCI). The solution includes: A network device sends first DCI to a terminal device, and the terminal device receives the first DCI from the network device, where the first DCI includes a first field and a second field, the first field indicates that a retransmitted transport block (TB) exists in a TB scheduled by using the first DCI, and the second field indicates an index of a retransmitted first TB in the TB scheduled by using the first DCI; and the terminal device receives the retransmitted first TB from the network device based on the first field and the second field; or the terminal device sends the retransmitted first TB to the network device based on the first field and the second field.

Abstract: In one embodiment, a terminal device and a network device each determine a quantity M of hybrid automatic repeat request (HARQ) processes supported by the terminal device. The network device sends downlink control information (DCI) to the terminal device. The DCI includes a first field that indicates a quantity N of transport blocks (TBs) scheduled by the DCI, where N is a positive integer greater than 1. If M=1, the terminal device receives or sends, in the HARQ process, an initially transmitted TB and/or a retransmitted TB in the N TBs scheduled by the DCI. If M is greater than 1, and N is less than or equal to M, the terminal device receives or sends, in N HARQ processes in the M HARQ processes, the N TBs scheduled by the DCI, where each of the N HARQ processes corresponds to one TB in the N TBs.

Abstract: Embodiments of this application provide a method for receiving and sending a reference signal, an apparatus, and a system, so that a network device can correctly demodulate uplink data of different terminal devices of a same cell. This solution is applicable to a wireless communications system including a first cell. The first cell includes a plurality of terminal devices that can transmit uplink data on a same time-frequency resource. A first terminal device in the plurality of terminal devices determines an index of a first sequence based on a first parameter value, and generates a first reference signal based on the first sequence indicated by the index of the first sequence. Then, the first terminal device sends the first reference signal to the network device. The first parameter value is different from a parameter value corresponding to another terminal device in the plurality of terminal devices.

Abstract: Example communication methods and apparatus are described. In one example method, a first cell includes a plurality of terminal devices that can transmit uplink data on a same uplink time-frequency resource. A first terminal device in the plurality of terminal devices determines a reference time domain location based on a preconfigured uplink time-frequency resource, where the reference time domain location is the same as a reference time domain location determined by another terminal device in the plurality of terminal devices. The first terminal device determines a time domain location that is (first duration×N H+second duration×(N?1)) away from the reference time domain location as a start time domain location of X gaps. The first terminal device further determines a time domain location that is (first duration×(M?1)+second duration x (M?1)) away from the reference time domain location as a start time domain location of Y first durations, where Y=X or Y=X+1.

Abstract: The present disclosure relates to data scheduling methods, apparatus, and systems. In one example method, a network device sends, to a terminal device, downlink control information (DCI) used to schedule N transport blocks (TBs). After determining that a downlink channel that carries first M TBs in the N TBs is transmitted in consecutive first downlink time units, the network device sends the downlink channel to the terminal device. The terminal device receives the downlink channel. After determining that ACKs/NACKs corresponding to the M TBs are transmitted in consecutive first uplink time units, the terminal device sends the ACKs/NACKs corresponding to the M TBs to the network device. N is a positive integer greater than 1, and M is a positive integer greater than 1 and less than or equal to N.

Abstract: A communication method, an apparatus, and a system for determining, by a first terminal device, a reference time domain position based on a preconfigured uplink time-frequency resource, where the reference time domain position is the same as a reference time domain position determined by another terminal device in a plurality of terminal devices, and the reference time domain position is used to initialize a first sequence; generating, by the first terminal device, a first reference signal based on the first sequence and a time interval, where the time interval is an interval between the reference time domain position and a start time domain position of transmission of the first reference signal; and sending, by the first terminal device, the first reference signal to a network device.

Abstract: Embodiments of this application disclose a signal transmission method and a related device, to transmit a signal between a network device and a terminal device. The method in the embodiments of this application includes: sending a first synchronization signal/broadcast channel block SSB to a first terminal device, where the first SSB includes a synchronization signal and a physical broadcast channel PBCH, the synchronization signal and the PBCH use a frequency division multiplexing FDM manner in resource occupation, a quantity of orthogonal frequency division multiplexing OFDM symbols occupied by the synchronization signal is greater than 2, and a quantity of OFDM symbols occupied by the PBCH is greater than 3.

Abstract: A communication method includes: determining, by a network side device, at least two pieces of target sub-configuration information according to a co-location rule, where at least two target signals corresponding to the at least two pieces of target sub-configuration information are quasi co-located; and sending, by the network side device, the at least two pieces of target sub-configuration information to the terminal device according to the co-location rule.

Abstract: A data transmission method, device, and system are provided. The method includes: sending, by a base station, an NPSS to UE by using a first subframe in a first radio frame and a first subframe in a second radio frame, where the first radio frame and the second radio frame are consecutive, and both the first radio frame and the second radio frame use a TDD uplink-downlink subframe configuration; sending, by the base station, an NPBCH to the UE by using a second subframe in the first radio frame and a second subframe in the second radio frame; sending, by the base station, an NSSS to the UE by using a third subframe in the first radio frame; and sending, by the base station, a SIB1-NB to the UE by using a third subframe in the second radio frame.

Abstract: A message transmission method and device relating to the field of communications technologies are described that improve an anti-interference capability in message transmission. The method includes generating a scrambling code according to a scrambling code initialization seed, wherein the scrambling code initialization seed meets the following expression: cinit=R·2a7+P·(nƒ mod k+1)·2b7 and then scrambling a message according to the scrambling code. The method further includes sending the scrambled message to a terminal on a physical downlink shared channel. Because the first time parameter has different values at at least two different moments, scrambling codes determined at the at least two corresponding different moments are different. Therefore, a possibility at which the base station uses a same scrambling code to scramble a same system message repeatedly in a time period is reduced, so that an anti-interference capability in system message transmission is improved.

Abstract: A data sending method, a data receiving method, a device, and a system, the receiving method including receiving indication information from a network device, where the indication information indicates a first resource used to transmit uplink data, and where the first resource overlaps with a first early data transmission (EDT) physical random access channel resource, and delaying, in response to determining that a preset condition is satisfied, transmission of the uplink data, where the delaying transmission of the uplink data comprises sending the uplink data to the network device on a second resource, and where the second resource is non-overlapping with the first EDT physical random access channel resource.

Abstract: A message transmission method and device relating to the field of communications technologies is disclosed, so as to improve an anti-interference capability in message transmission. The method includes: generating, by a base station, a scrambling code according to a first time parameter; then scrambling a system message according to the scrambling code; and finally sending the scrambled system message to a terminal on a physical broadcast channel. In this technical solution, because the first time parameter has different values at at least two different moments, scrambling codes determined at the at least two corresponding different moments are different. Therefore, a possibility at which the base station uses a same scrambling code to scramble a same system message repeatedly in a time period is reduced, so that an anti-interference capability in system message transmission is improved.

Abstract: This application provides example communication methods and apparatuses. One example method includes performing, by a network device on a preconfigured resource, data demodulation on uplink data from a terminal device. The network device can then send downlink control information (DCI) to the terminal device, where the DCI includes first indication information, and if the uplink data fails to be demodulated, or it is determined, based on a result of the data demodulation, that the terminal device needs to retransmit the uplink data, the first indication information indicates either the terminal device to initiate random access or EDT and retransmit the uplink data or that the uplink data fails to be demodulated.

Abstract: A channel quality measurement method and apparatus are described. The method can include a network device sending configuration information to a terminal device. The configuration information configures a downlink carrier set. The terminal device determines a first downlink carrier from the downlink carrier set. The terminal device sends a random access process message 3 (Msg3) to the network device. The random access process message 3 includes first information. The first information includes information indicating channel quality of the first downlink carrier. The channel quality provides information about a first repetition level to the network device. The first repetition level is a minimum repetition level required when transmission performed on a downlink channel based on a preset transmission parameter meets a preset block error rate.

Abstract: Embodiments relate to the internet of things communications field, and provide a data transmission method, device, and system, and a storage medium. The method includes: determining a first parameter, a second parameter, a first gap threshold, and a second gap threshold; determining, based on the first parameter and the first gap threshold, whether a gap exists in transmission on a downlink control channel; sending downlink control information through the downlink control channel based on a determining result; determining, based on the second parameter and the second gap threshold, whether a gap exists in transmission on a downlink data channel; and sending a transport block through the downlink data channel based on a determining result.

Abstract: Embodiments of this disclosure provide an indication information transmission method and an apparatus, and relate to the communications field. The method includes: generating, by a network device, indication information, where the indication information is used to indicate an existence status of a downlink control signal in a first time period; and sending, by the network device, the indication information to a terminal device.

Abstract: An information sending and receiving method and a device, the sending method including generating a first signal, and sending the first signal on a first resource. The first resource includes a first part of resource elements (REs), and the first part of the REs comprises at least one of a first RE element or a second RE element. The first RE element comprises all REs corresponding to an orthogonal frequency division multiplexing (OFDM) symbol 0, symbol 1, and symbol 2 in each of subframes 0, 5, and 9 of each radio frame on a first carrier, the second RE element comprises an REO, RE3, RE6, and RE9 in each of an OFDM symbol 4, 7, 8, and 11 in subframe 0 of each radio frame on the first carrier, and the first carrier is a carrier in a narrow band internet of things (NB-IoT) system.

Abstract: Example reference signal sending methods and apparatus are described. In one example method, a terminal device detects whether a paging scheduling message exists in a PDCCH search space whose starting subframe is a subframe corresponding to a paging occasion (PO), and/or detects whether a wake-up signal (WUS) exists before a PO. A network device determines a time domain resource in first duration based on a quantity of paging occasions in a discontinuous reception period, where the time domain resource is a time domain resource in a time-frequency resource used to transmit a reference signal. The network device sends the reference signal to a terminal device on the time domain resource.

Abstract: This application provides a communication method and a communications apparatus, where the communication method includes: receiving, by a terminal device, downlink control information, where the downlink control information is used to indicate the terminal device to receive or send a first channel on a first resource; receiving, by the terminal device, first indication information, where the first indication information is used to indicate a second resource; when the first resource and the second resource overlap in time domain, receiving or sending, by the terminal device, the first channel on a third resource, where the third resource and the second resource do not overlap in time domain.

Abstract: The present disclosure relates to methods and terminal devices for detecting a wake-up signal. A terminal device sends first information to a network device, where the first information indicates a reported gap, receives second information sent by the network device, and determines a configuration condition of a first gap and a configuration condition of a second gap based on the second information. The terminal device determines a target gap based on the reported gap, the configuration condition of the first gap, and the configuration condition of the second gap, and detects a wake-up signal at a detection position before a start position of the first paging opportunity in a paging time window, where the detection position is determined based on the target gap and maximum duration of the wake-up signal.