Abstract:
A method for generating a codebook and a method and an apparatus for data transmission are provided. The method includes: receiving a label of a codeword sent by a User Equipment (UE); selecting the codeword identified by the label from the codebook for eight-antenna; and coding data to be sent by using the codeword. The codebook for eight-antenna includes at least one rank-8 codeword for eight-antenna. The rank-8 codeword for eight-antenna is generated by multiplying an inverse matrix of a rotation matrix for eight-antenna with an eight-dimensional matrix formed by rank-4 codewords for four-antenna; or generated by extending rank-4 codewords for eight-antenna, where the rank-4 codeword for eight-antenna is generated according to codewords for four-antenna. Therefore, the codeword in the codebook for eight-antenna is applicable to scenarios including dual-polarization strong correlation, dual-polarization weak correlation, single-polarization strong correlation, and single-polarization weak correlation, etc.
Abstract:
Provided in embodiments of the present application are a method and terminal for handling CSI. The embodiments of the present invention use the terminal to measure and report to a base station first CSI, where the first CSI comprises a first RI, a first PMI, and a first CQI, to acquire a second RI and/or a second PMI on the basis of the first CSI, thus allowing the terminal to utilize the second RI to measure and report to the base station the PMI and CQI corresponding to the second RI; or, the terminal utilizes the second RI and the second PMI to measure and report to the base station the CQI corresponding to the second RI and to the second PMI; or, the terminal utilizes the second PMI to measure and report to the base station the RI and CQI corresponding to the second PMI.
Abstract:
A method, a codebook, and a Base Station (BS) for precoding are provided. The precoding method includes: obtaining a total uplink power of a User Equipment (UE); if the total uplink power is greater than ¾ of a rated total transmit power of antennas, selecting a codeword from a first codebook with imbalanced power between layers; otherwise, selecting a codeword from the first codebook and a second codebook with balanced power between layers, so as for precoding data to be transmitted according to the selected codeword.
Abstract:
A method and a device for measuring channel quality are provided. The method includes: receiving first signal characteristic information and second signal characteristic information sent by a network side, where the first signal characteristic information is used to indicate a first signal, and the second signal characteristic information is used to indicate a second signal; receiving a downlink signal sent by each node in multiple nodes, obtaining a downlink channel response and downlink interference of each node respectively according to the first signal and the second signal in the downlink signal sent by each node; obtaining downlink channel quality information of each node according to the downlink channel response and the downlink interference of each node; and reporting the downlink channel quality information of each node to the network side. According to embodiments of the present invention, overheads for the node to send signaling is greatly lowered.
Abstract:
An information transmission method and apparatus. In the method, a terminal device generates a first codeword, where the first codeword is obtained based on a second codeword, a quantity of elements included in the second codeword is greater than a quantity of elements included in the first codeword, the second codeword is associated with a first coefficient set of a downlink channel, and the first coefficient set includes an element included in at least one row vector or column vector of a first coefficient matrix; and then the terminal device feeds back the first codeword to a network device. The terminal device can indicate a position and a numerical value of an element in the first coefficient set by reporting only the first codeword. This manner is simple. In addition, a codeword length of the first codeword is shorter than a codeword length of the second codeword.
Abstract:
A cell configuration method includes: determining, by a first base station corresponding to a first cell, system information of a second cell; and notifying, by the first base station, a second base station corresponding to the second cell of the system information, so that the second base station sends and receives signals according to the system information. According to solutions provided in embodiments of the present application, system information of a cell may be dynamically or semi-statically adjusted according to user equipment distribution and service distribution.
Abstract:
This application relates to the mobile communications field, and in particular, to a technology for obtaining a reference signal in a wireless communications system. In one example method for obtaining a reference signal, a terminal device obtains position offset information. The terminal device obtains a first sequence based on the position offset information. The terminal device demodulates, by using the first sequence, a control channel signal carried in a control channel resource set to obtain downlink control information.
Abstract:
Embodiments of the present invention provide a bandwidth allocation method and apparatus, user equipment, and a base station. The method includes: receiving, by user equipment, virtual bandwidth configuration information, where the virtual bandwidth configuration information is used for indicating a configuration of a virtual bandwidth; and performing, by the user equipment, signal reception and/or signal processing according to the virtual bandwidth indicated by the virtual bandwidth configuration information, where each virtual bandwidth is a part or all of a downlink maximum available bandwidth or a downlink transmission bandwidth, and the downlink maximum available bandwidth is a maximum bandwidth available for downlink transmission. In the embodiments of the present invention, reduction of overheads and reduction of complexity of signal reception and signal processing are implemented, and overheads and complexity of signal reception and processing feedback can be flexibly controlled.
Abstract:
The present disclosure relates to resource indication methods and apparatus. In one example method, a network device configures resource configuration information for a terminal device. The terminal device determines channel state information based on the resource configuration information, and sends the channel state information. The resource configuration information is used to indicate a first reference signal resource set, L second reference signal resource sets, and a type of the first reference signal resource set. The first reference signal resource set includes resources for M first reference signals, and a resource for one of the M first reference signals is used to measure a channel.
Abstract:
The present disclosure relates to methods for determining a precoding matrix indicator, user equipment, and base stations. One example method includes sending a first reference signal set to user equipment, where the first reference signal set is associated with a user equipment-specific matrix set, and receiving a precoding matrix indicator (PMI) sent by the user equipment, where the PMI is used for indicating a precoding matrix that is selected based on the first reference signal set by the user equipment.