Abstract: This application provides a channel state information (CSI) sending method, an apparatus, and a system. In this solution, a terminal device feeds back a first rank used for a common channel and a first precoding matrix indicator, and feeds back a second rank used for a traffic channel and a second precoding matrix indicator to a base station. The first precoding matrix indicator is used to indicate a first precoding matrix in a first precoding matrix set. The second precoding matrix indicator is used to indicate a second precoding matrix in a second precoding matrix set. The first precoding matrix set is different from the second precoding matrix set. Different precoding matrix sets are used on the common channel and the traffic channel, to obtain channel state information, thereby reducing bits required for feedback while satisfying a system requirement.

Abstract: Embodiments of this application provide a channel state information transmission method, a terminal device, and a network device.

Abstract: Embodiments of the present invention provide a method for determining a precoding matrix indicator, a receiving device, and a sending device. The method for determining a precoding matrix indicator includes: selecting, by a receive end, a precoding matrix W from a codebook based on a reference signal sent by a transmit end, where the precoding matrix W is a product of two matrices W1 and W2, where the W1 includes NB block matrices Xi, NB?1, and the W1 is indicated as: W1=diag{X1, . . . , XNB}, where 1?i?NB, and a column xi,j of each block matrix Xi is a Kronecker kronecker product of a first vector Aij and a second vector Bij, that is, xij=Aij?Bij; and sending, by the receive end, a precoding matrix indicator PMI corresponding to the precoding matrix W to the transmit end, so that the transmit end obtains the precoding matrix W according to the PMI.

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: 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: 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: The present disclosure relates to uplink transmission methods and apparatus. One example method includes sending, by a first device, a quality criterion event of at least one link between the first device and a second device to the second device, where a quality criterion event of each link includes at least one parameter, and receiving report information determined by the second device based on a quality criterion of the at least one link and the parameter in the quality criterion event of each link.

Abstract: Embodiments provide a signaling sending method, an apparatus, and a system, to improve transmission efficiency and save air interface resources. According to a first aspect, one embodiment provides a signaling sending method. A base station determines a first precoding matrix indication (PMI1) and a second precoding matrix indication (PMI2), where the PMI1 and the PMI2 are used to indicate a precoding matrix. The base station sends first signaling to user equipment, where the first signaling includes the PMI1. The base station sends second signaling to the user equipment, where the second signaling includes the PMI2.

Abstract: The present disclosure relates to signaling transmission methods. In one example method, a base station receives an uplink reference signal sent by user equipment (UE). The base station determines a quantity of antenna ports, where the quantity of antenna ports is a quantity of antenna ports used by the UE to send the uplink reference signal. The base station determines frequency domain resource information based on the quantity of antenna ports, where the frequency domain resource information indicates at least one of a quantity of sub-bands or a sub-band bandwidth. The base station determines a precoding matrix indicator (PMI) of each sub-band based on the frequency domain resource information. The base station sends the PMI of the sub-band to the UE.

Abstract: A power allocation method and apparatus belong to the field of communications technologies. The method includes: determining, by UE, a first start time point of a first control subframe and a second start time point of a second control subframe; determining, based on the first start time point and the second start time point, whether a priority of a first target subframe is higher than a priority of a second target subframe; and if the priority of the first target subframe is higher than the priority of the second target subframe, allocating, based on first uplink channel information and second uplink channel information, power to the UE in a base station or a cell group in which the first target subframe is located, and allocating reserved power of the UE to the UE in a base station or a cell group in which the second target subframe is located.

Abstract: According to a resource configuration method, user equipment, and a base station that are provided in embodiments of the present invention and relate to the communications field. A specific solution is as follows: A base station sends M reference signals to UE in N time units in a time unit set, where the reference signal is used by the UE to perform channel quality measurement, and each reference signal in the M reference signals is corresponding to one piece of precoding matrix information. The base station receives channel quality indication information sent by the UE.

Abstract: This application discloses a method and an apparatus for transmitting a reference signal, and a method and an apparatus for receiving a reference signal. The transmission method includes: receiving, by a second network device, first group information of reference signal port from a first network device, where the first group information includes information about N groups of reference signal port, N is a positive integer, and N?1; determining a kth group of reference signal antenna port in the N groups of reference signal port, where k is a positive integer, and N?k?1; and transmitting a reference signal on the kth group of reference signal antenna port. Quick switching between the reference signal antenna port of the second network device is implemented, and adaptive uplink data transmission can be performed.

Abstract: Embodiments provide a method for generating a random access channel ZC sequence, and an apparatus. A method for generating a random access channel ZC sequence includes: generating, by a base station, notification signaling, where the notification signaling instructs user equipment UE to generate a random access ZC sequence by using a second restricted set in a random access set; and sending, by the base station, the notification signaling to the UE, so that the UE generates the random access ZC sequence by using the second restricted set, where the random access set includes an unrestricted set, a first restricted set, and the second restricted set; and the second restricted set is a random access set that the UE needs to use when a Doppler frequency shift of the UE is greater than or equal to a first predetermined value.

Abstract: A power control method, including obtaining, by a UE, configuration information, where the configuration information includes a configuration parameter of at least one secondary carrier (Scell) configured by a base station for the UE; setting, by the UE, an initial power adjustment value of the Scell according to the configuration parameter of the Scell in the configuration information, and controlling, by the UE, transmit power on the Scell according to the set initial power adjustment value of the Scell.

Abstract: A control information sending method, a base station, and user equipment are provided. The method includes: sending, by a base station, first control information to first user equipment; transceiving, by the base station, first data to/from the first user equipment according to the first control information; and sending, by the base station, first trigger information to the first user equipment, where the first trigger information is used to indicate that the base station transceives second data to/from the first user equipment according to partial information or all information of the first control information.

Abstract: Embodiments provide resource scheduling method, user equipment, and an access network device. The method includes: receiving, by user equipment over a first control channel, first indication information corresponding to a transport block, where time-frequency resources occupied by a data channel in which the transport block is located include a first resource set and a second resource set, and the first indication information is used to indicate the first resource set and a time-frequency resource of a second control channel; receiving, by the user equipment, second indication information over the second control channel, where the second indication information is used to indicate the second resource set; and determining, by the user equipment, the transport block based on the first resource set and the second resource set. This can reduce control signaling overheads and improve flexibility of control channel resource scheduling.

Abstract: The present disclosure discloses a physical downlink control channel (PDCCH) candidate determining method and device, and relates to the field of wireless communications. The method includes: determining a PDCCH resource set p in a subframe k, where the PDCCH resource set p includes NECCE,p,k=q×r control channel elements (CCEs), a PDCCH candidate of an EPDCCH with an aggregation level being L corresponds to L CCEs having consecutive reference numerals, and the PDCCH candidate is capable of carrying a PDCCH; and determining the number of PDCCH candidates at the aggregation level L of a carrier corresponding to an index Cellindex and an CCE corresponding to each PDCCH candidate, where the CCE corresponding to each PDCCH candidate at the aggregation level L is related to the index Cellindex.

Abstract: According to a resource configuration method, user equipment, and a base station that are provided in embodiments of the present invention and relate to the communications field, reference signals used for measurement and overheads of corresponding measurement and feedback are reduced. A specific solution is as follows: A base station sends M reference signals to UE in N time units in a time unit set, where the reference signal is used by the UE to perform channel quality measurement, and each reference signal in the M reference signals is corresponding to one piece of precoding matrix information; receives channel quality indication information sent by the UE.

Abstract: Embodiments of the present invention provide a method for determining a precoding matrix indicator, a receiving device, and a sending device. The method for determining a precoding matrix indicator includes: selecting, by a receive end, a precoding matrix W from a codebook based on a reference signal sent by a transmit end, where the precoding matrix W is a product of two matrices W1 and W2, where the W1 includes NB block matrices Xi, NB?1, and the W1 is indicated as: W1=diag{X1, . . . , XNB}, where 1?i?NB, and a column xi,j of each block matrix Xi is a Kronecker product of a first vector Aij and a second vector Bij, that is, xij=Aij?Bij; and sending, by the receive end, a precoding matrix indicator PMI corresponding to the precoding matrix W to the transmit end, so that the transmit end obtains the precoding matrix W according to the PMI.

Abstract: A random access method, user equipment, and a network device are provided to reduce interference to a neighboring cell. The method includes: receiving at least two groups of random-access configuration parameters from a network device, where each group of random-access configuration parameters includes a power adjustment step for retransmission of a random access preamble; selecting one group of random-access configuration parameters from the at least two groups of random-access configuration parameters based on a threshold; determining transmit power of the random access preamble based on a power adjustment step for retransmission of the random access preamble in the selected random-access configuration parameters; and sending the random access preamble to the network device at the transmit power.