Abstract: This application provides a data transmission method and an apparatus. The method includes: receiving first DCI sent by a network device, where the first DCI includes a quantity of layers for transmitting first data through a PDSCH, and under a first condition, the quantity of layers of the first data is less than or equal to N1; and under a second condition, the quantity of layers of the first data is less than or equal to N2, N1 is less than N2, N2 is a maximum quantity of layers, for transmitting data through the PDSCH, supported by a terminal device, and N1 is a positive integer; and receiving the first data sent by the network device, and demodulating the first data based on the first DCI. Therefore reducing radio frequency power consumption of the terminal device.

Abstract: The present disclosure relates to communication methods in a UCI-only scenario. One example method includes receiving downlink control information used to schedule a PUSCH, where the PUSCH includes a first frequency hopping resource and a second frequency hopping resource, and a time-domain start symbol of the first frequency hopping resource is before a time-domain start symbol of the second frequency hopping resource, and sending first UCI on the PUSCH, where the first UCI includes at least one of an HARQ-ACK, CSI-part1, or CSI-part2, where a quantity GCSI-part1(1) of coded bits that are of the CSI-part1 in the first UCI and that are mapped onto the first frequency hopping resource is a smaller one of a fourth value and a fifth value.

Abstract: This application discloses a control information transmission method and device, and relates to the field of communications technologies, to reduce power consumption of UE. The control information transmission method provided in embodiments of this application includes: receiving, by user equipment UE, first indication information sent by a base station, where the first indication information indicates a first time window; and stopping, by the UE, monitoring a physical downlink control channel PDCCH in the first time window.

Abstract: Embodiments described provide a data transmission method, a network device, and a terminal device. The method includes: sending, by a network device, control information corresponding to target data to a terminal device on a control resource, where the control resource and a data resource have a correspondence, and the control resource is used by the terminal device to determine the data resource on which the target data is received; and sending, by the network device based on the correspondence, the target data to the terminal device on the data resource. In the embodiments, after sending the control information corresponding to the target data on the control resource, the network device can send the target data on the data resource based on the correspondence between the control resource and the data resource, so that terminal devices having different bandwidth capabilities are able to receive the target data.

Abstract: This application discloses a resource configuration method, a method for determining a bandwidth part, a method for indicating a bandwidth part, and a device. The method for indicating a bandwidth part includes: determining, by a base station, the bandwidth part based on a mapping relationship between a first carrier bandwidth and a first bandwidth part set and/or a mapping relationship between a capability bandwidth of a terminal device and a second bandwidth part set, where the first bandwidth part set includes a plurality of bandwidth parts, the first bandwidth part set includes the bandwidth part, the second bandwidth part set includes a plurality of bandwidth parts, and the second bandwidth part set includes the bandwidth part; and indicating, by the base station, the bandwidth part to the terminal device.

Abstract: The present disclosure describes a physical random access channel (PRACH) preamble sending method. In one example method, access slot information is received by a user equipment (UE) from a controller. The received access slot information comprises a start access slot (AS) corresponding to each random access channel (RACH) sub-channel. ASs that start from the start AS and whose quantity is a quantity of PRACH preamble repetitions are used by the UE to send a same PRACH preamble. A PRACH preamble is repeatedly sent, by the UE, to a base station according to the received access slot information.

Abstract: The present disclosure relates to communication methods and communications apparatus. One example method includes receiving, by a terminal, configuration information sent by a network device, where the configuration information is used to indicate a resource in a plurality of candidate resources of a common search space, and the candidate resources of the common search space are determined based on one or more of a cell identity, downlink bandwidth, a frequency domain resource location of a synchronization channel, and a frequency domain resource location of a broadcast channel, and receiving, by the terminal, common control information on the resource indicated by the configuration information.

Abstract: Embodiments of the present invention provide an information transmission method, a user-side device, and a network-side device. The information transmission method provided in the embodiments includes sending, by the user-side device, a repetition factor to the network-side device, and sending, by the user-side device, a physical random access channel (PRACH) message part to the network-side device by using the repetition factor.

Abstract: The present disclosure describes a physical random access channel (PRACH) preamble sending method. In one example method, access slot information is received by a user equipment (UE) from a controller. The received access slot information comprises a start access slot (AS) corresponding to each random access channel (RACH) sub-channel. ASs that start from the start AS and whose quantity is a quantity of PRACH preamble repetitions are used by the UE to send a same PRACH preamble. A PRACH preamble is repeatedly sent, by the UE, to a base station according to the received access slot information.

Abstract: Embodiments of the present invention disclose a wireless data transmission method, including: obtaining a repetition quantity required for data transmission of each user equipment (UE) in a management range, and determining a round trip time (RTT) of the UE according to obtained repetition quantity information of the UE, process quantity information of the UE, and a transmission time interval (TTI). A repetition quantity required by a UE may be learned of by using repetition quantity information of the UE. Therefore, for a coverage capability of each UE, each RTT can include as few processes as possible, provided that a requirement of the UE for a repetition quantity is met. In this way, a probability of successful data decoding may be efficiently improved, thereby efficiently improving a coverage capability of UE in wireless communication.

Abstract: Embodiments of the present invention provide an information transmission method, a user-side device, and a network-side device. The information transmission method provided in the embodiments includes sending, by the user-side device, a repetition factor to the network-side device, and sending, by the user-side device, a physical random access channel (PRACH) message part to the network-side device by using the repetition factor.

Abstract: The present invention provides a data transmission method, apparatus, and system. The method includes: performing coding and modulation on data; mapping the modulated data onto M carriers, where M is an integer greater than 1, a carrier spacing of the M carriers is greater than or equal to a data rate, and the carrier spacing is a spacing between center frequencies of two carriers; performing spectrum spreading, scrambling, and precoding processing on data mapped onto each carrier; performing multi-carrier modulation on the spread, scrambled, and precoding processed data; and sending the multi-carrier modulated data to a receiving apparatus. According to the data transmission method, apparatus, and system provided by the present invention, a carrier frequency offset sensitivity problem may be resolved, thereby improving reliability of a communications system.