Abstract: The present disclosure relates to signal transmission methods, network devices, and terminal devices. One example method includes sending, by a network device, N first reference signals to a terminal device, where N is a positive integer greater than or equal to 1, sending, by the network device, physical layer control signaling to the terminal device, where the physical layer control signaling is used to trigger the terminal device to send a channel quality measurement result of the N first reference signals to the network device, and is used to instruct the terminal device to send M second reference signals to the network device, and M is a positive integer greater than or equal to 1, receiving, by the network device, the channel quality measurement result from the terminal device, and receiving, by the network device, the M second reference signals from the terminal device.

Abstract: This application provides an uplink reference signal sending method and apparatus, a base station, and user equipment (UE). The method includes: configuring, by the base station, M pieces of uplink reference signal resource information for the UE; and sending, by the base station, the M pieces of uplink reference signal resource information to the UE, so that the UE sends uplink reference signals based on different uplink reference signal resource information with different beamforming gains. A path loss is compensated for by using a beamforming technology. In addition, the base station configures the M pieces of uplink reference signal resource information for the user equipment UE, so that the UE sends the uplink reference signals by using different relatively uplink reference signal resource information based on different beamforming gains. Therefore, uplink reference signal sending efficiency is improved.

Abstract: This application discloses communication methods and apparatuses. One method includes: receiving, by a terminal device, a reference signal from a beam of a network device; determining, by the terminal device, availability of the beam based on a threshold and the reference signal; and sending, by the terminal device, feedback information to the network device, wherein the feedback information indicates the availability of the beam.

Abstract: The present disclosure relates to communication methods. One example method includes determining a first bandwidth part (BWP) and a second BWP, determining an association relationship between the first BWP and the second BWP, and at least one of determining a first quasi co-location (QCL) relationship based on the association relationship, and receiving a physical downlink shared channel (PDSCH) in the second BWP based on the first QCL relationship, or determining a second QCL relationship based on the association relationship, and receiving a physical downlink control channel (PDCCH) in the second BWP based on the second QCL relationship.

Abstract: This application provides an uplink power control method and apparatus. A network side device sends a plurality of pieces of configuration information of an RACH to UE, and indicates, by using a scheduling message of the RACH, identifier information of the configuration information of the RACH used by the UE. The UE calculates a transmit power of the RACH based on the configuration information that is of the RACH and that is corresponding to the identifier information, and sends a random access preamble to the network side device based on the transmit power of the RACH.

Abstract: A random access resource configuration method and a communications device. The method includes receiving, by a terminal device, index indication information, where the index indication information is used to indicate a first configuration index, determining, by the terminal device based on the first configuration index, first configuration information corresponding to the first configuration index, where the first configuration information is used to indicate a time domain resource for a first group of random access preamble occasions (ROs) or a time domain resource for a second group of ROs, and where the time domain resource for the first group of ROs and the time domain resource for the second group of ROs are located in a first time unit in a random access configuration period.

Abstract: This application provides a physical broadcast channel sending/receiving method and an apparatus. In the method, after receiving two broadcast channel signals on two corresponding physical broadcast channels at two time-frequency resource locations, the terminal device determines that information other than an offset of a corresponding time-frequency resource location is the same in two pieces of broadcast information carried in the two broadcast channel signals, obtains a time offset difference between the foregoing two time-frequency resource locations, and generates a scrambling sequence based on the time offset difference; and the terminal device separately descrambles the two broadcast channel signals based on the scrambling sequence and a preset scrambling sequence, thereby implementing joint decoding on the two broadcast channel signals, to obtain one piece of broadcast information.

Abstract: A data sending method, a related device, and a system are described. The method includes sending, by a network device, resource location information of a first reference signal and a physical channel to a terminal, where a first time-frequency resource on which the first reference signal is mapped overlaps a second time-frequency resource corresponding to the physical channel. An overlapping resource is not used to transmit the physical channel, and a third time-frequency resource in the second time-frequency resource other than the overlapping resource is used to transmit the physical channel. Alternatively, an overlapping resource is used to send a second reference signal; or an overlapping region is used to send a second reference signal, where the terminal skips sending the first reference signal, and the second reference signal is orthogonal to the first reference signal.

Abstract: A detection window indication method and apparatus. The method includes receiving control channel configuration information from a network device, where the control channel configuration information indicates a resource multiplexing mode of a resource set of a control channel and a common signal block, and further indicates at least one of a duration of a detection window of the control channel or a time-domain start location of the detection window of the control channel, and detecting, according to the detection window and the resource set, the control channel.

Abstract: An uplink power control method and an device is provided. The uplink power control method includes: sending a configured measurement pilot, wherein the measurement pilot is corresponding to information about a precoding matrix; and sending a configured power control parameter, wherein the power control parameter is corresponding to the configured measurement pilot, and the power control parameter is used to control transmit power of a terminal device in a serving cell. According to the embodiments of the present invention, accuracy of uplink power control is improved.

Abstract: This application discloses a communications method, and the method includes: receiving, by a terminal device, first information, where the first information is used to indicate one or more first time units in a random access system frame; and determining, by the terminal device, the one or more first time units based on the first information and a configuration table, where one or more time units in the configuration table are determined based on an uplink-downlink configuration period and a second time unit, the one or more first time units are an optional time domain resource of a random access sequence, and the second time unit is an optional time domain resource of a synchronization channel block. According to the method and the apparatus in this application, the optional time domain resource of the random access sequence can be determined.

Abstract: A method and apparatus for precoding matrix indicator feedback reduce a quantity of bits in the feedback. In the method, a terminal device receive a reference signal from a base station, determines a precoding matrix W in a precoding matrix set corresponding to a rank indication. W satisfies W=W1×W2×W3, W1, W2 and W3 and matrices and respectively corresponding to a first, second and third precoding matrix indicator. None of W1, W2, and W3 is an identity matrix, and the 2M columns in W1 comprise every column in W1×W2. The terminal device transmits the rank indication, the first precoding matrix indicator, the second precoding matrix indicator, and the third precoding matrix indicator to the base station. Therefore, a quantity of to-be-selected vectors is reduced by using a first-stage feedback and a second-stage feedback, thereby reducing calculation complexity of third-stage feedback, and reducing a quantity of bits in the third-stage feedback.

Abstract: The present invention provides a signal sending apparatus, a signal detection apparatus, a signal sending and detection system, a signal sending method, and a signal detection method. The apparatus determines a time unit that is in each time window and that is used to transmit a synchronization signal, and transmits the synchronization signal in the determined time unit in each time window. Therefore, a synchronization signal is always located in a time unit that has a fixed location in each time window, so that a device at a receive end needs to perform detection only in a fixed time unit in each time window, thereby reducing complexity of designing and detecting the synchronization signal.

Abstract: This application provides an enhanced physical downlink control channel transmission method and apparatus. The method includes: in a physical resource block set, separately arranging first resource groups in each physical resource block pair PRB pair, where the first resource groups are enhanced resource element groups eREGs or REGs, and the physical resource block set includes at least one of the physical resource block pairs; numbering second resource groups according to a correspondence between the first resource groups and the second resource groups in the physical resource block set, where the second resource groups are control channel element eCCE groups or control channel candidates; determining numbers of the second resource groups for transmitting an E-PDCCH; and mapping, according to the determined numbers, the E-PDCCH to the corresponding first resource groups for transmission. The technical solution of this application resolves an E-PDCCH transmission problem.

Abstract: A method includes: generating a reference signal sequence based on a first m-sequence and a second m-sequence, where the reference signal sequence is a gold sequence, a cyclic shift value of the first m-sequence is determined based on a physical cell identifier and first timing information, and for a same physical cell identifier, a difference between two cyclic shift values of the first m-sequence that are separately determined based on the physical cell identifier and any two pieces of adjacent first timing information is L1, where L1 is a positive integer, and the first timing information includes a synchronization signal block time index or a first part of the synchronization signal block time index; and after modulating the generated reference signal sequence, mapping a modulated reference signal sequence to N subcarriers to obtain a reference signal, where N is a positive integer greater than or equal to 1.

Abstract: Embodiments provide an uplink power control method and an apparatus. The uplink power control method in the present invention includes: receiving a measurement pilot configured by a network device, where the measurement pilot is corresponding to information about a precoding matrix; and receiving a power control parameter configured by the network device, where the power control parameter is corresponding to the configured measurement pilot, and the power control parameter is used by user equipment UE to control transmit power of the UE in a serving cell.

Abstract: Embodiments of the present invention relate to the communications field, and provide a data transmission method, a sending device, and a receiving device. Transmission requirements of different subbands can be maximally satisfied, and a system throughput can be improved. The method includes: determining, by a sending device, rank indicators of J (an integer greater than or equal to 1) subbands corresponding to a to-be-transmitted channel, where the rank indicators of the J subbands are not totally the same; determining, by the sending device based on a rank indicator of each of the J subbands, a transmission block size.

Abstract: This application discloses example information indication methods and related devices. In one example method, a terminal device receives first information used to instruct the terminal device to receive a first channel in a first time unit, and second information used to instruct the terminal device to receive a second channel in a second time unit. The terminal device receives the first channel based on the first information. When the first time unit is equal to the second time unit, the terminal device receives the second channel based on the first information, where the second information is a first indicator value. When the first time unit is not equal to the second time unit, the terminal device receives the second channel based on the second information where the second information is a second indicator value.

Abstract: The present application provides a method and an apparatus for allocating control channel candidates, which relate to the communications field, and can allocate control channel candidates at different aggregation levels to K ePDCCH sets and reduce complexity of blind detection performed by a UE. The method includes: determining K sets for transmitting a control channel, where each set in the K sets includes at least one physical resource block pair; and allocating control channel candidates at each aggregation level to at least one set in the K sets according to at least one of aggregation levels supported by the control channel to be transmitted, the number of control channel candidates corresponding to each aggregation level, the K sets for transmitting the control channel, and types of the sets.

Abstract: The present invention discloses a control information transmission method and an apparatus. In one solution of the present invention, control information that is sent by a control information sending device is associated with one of at least two transmission schemes, and the control information includes information used to indicate a transmission scheme type, so that a control information receiving device can determine the corresponding transmission scheme based on the control information.