Abstract:
Embodiments of the present invention provide a data communication method and a related device. The data communication method may include performing, by a first communications device, power adjustment on Q codebooks using Q power factors, to obtain power-adjusted Q codebooks, where Q is a positive integer, and the Q power factors and the Q codebooks are in a one-to-one correspondence and mapping, by the first communications device, Q to-be-transmitted bit sequences to Q codewords in the power-adjusted Q codebooks, where the Q bit sequences and the Q codewords are in a one-to-one correspondence. The method also includes obtaining, by the first communications device, a modulation symbol based on the Q codewords and sending, by the first communications device, the modulation symbol on a resource block.
Abstract:
The present invention discloses a solution including: receiving channel quality fed back by at least two user terminals; determining, according to the received channel quality fed back by the at least two user terminals, a user terminal that needs to be served by each transmit antenna of a base station device; for user terminals served by a same transmit antenna, configuring, according to channel quality fed back by the user terminals served by the same transmit antenna, a constellation expansion modulation scheme for each user terminal served by the same transmit antenna, and determining an intra-stream power allocation factor and an initial phase rotation coefficient of the transmit antenna; and processing, by using the modulation scheme, a signal to be sent to the user terminal, and transmitting the processed signal to the user terminal according to the intra-stream power allocation factor and the initial phase rotation coefficient.
Abstract:
A data transmission method and a related device are disclosed. The data transmission method includes: obtaining to-be-transmitted K bits; mapping the K bits to F resource units according to a codebook and a value of the K bits, so as to obtain a codeword CK that is to be transmitted by using the F resource units, where the codebook includes S codewords in a one-to-one mapping relationship with S different values of the K bits; and sending the codeword CK by using the F resource units.
Abstract:
Embodiments of this application disclose a pilot signal sending and receiving method and apparatus, wherein the pilot signal sending method includes: establishing a first correspondence between a carrier identifier and a pilot pattern of a first type of pilot signal; establishing a second correspondence between a carrier identifier and a resource block set; acquiring a target carrier identifier of a target carrier; determining a location of a target resource block set corresponding to the target carrier identifier; determining a target pilot pattern that is of a first type of pilot signal and that corresponds to the target carrier identifier; mapping, according to the target pilot pattern, the first type of pilot signal to each resource block in the target resource block set on the target carrier. In this method, mapping is performed on a pilot signal only in a resource block set, which may reduce pilot redundancy and overheads.
Abstract:
This application discloses a method for determining a pilot arrangement and a base station. The method includes the following steps. S1. Select a first optimized pilot arrangement P1 from an available subcarrier set G as a pilot arrangement of the first transmit antenna, and set G1=G−P1; S2. Perform a cyclic shift on the P1; if a Pi obtained after the shift is a subset of the G1, use the Pi as a pilot arrangement of the ith transmit antenna; or if a Pi obtained after the shift is not a subset of the G1, select a Pi from the G1 as a pilot arrangement of the ith transmit antenna; and set G1=G1−Pi and i=i+1, and repeatedly perform S2 until i is equal to a quantity of transmit antennas.
Abstract:
Embodiments disclose a method and an apparatus for transmitting indication information. The method includes: determining, according to one or more codebooks, a first codebook to be used by a terminal device to send an uplink data stream; determining codebook indication information used to indicate the first codebook; and determining codebook indication information used to indicate the first codebook. For the method and the apparatus for transmitting indication information according to embodiments of the present invention, a network device determines, according to one or more codebooks, a first codebook to be used by a terminal device to send an uplink data stream, determines codebook indication information used to indicate the first codebook, and sends the codebook indication information to the terminal device, so that the terminal device can determine the first codebook assigned by the network device and transmit data by using the first codebook.
Abstract:
The present application provide a method for a terminal device to transmit uplink service data to a base station. The terminal device obtains uplink service data from a user input in a service session. The terminal device obtains a codebook from a preset codebook set of the terminal and a pilot sequence corresponding to the codebook. The terminal device generates an uplink data signal according to the codebook and the uplink service data, and generate a pilot signal corresponding to the pilot sequence. The terminal device transmits the uplink data signal and the pilot signal to the base station.
Abstract:
This application discloses a method for determining a pilot arrangement and a base station. The method includes the following steps. S1. Select a first optimized pilot arrangement P1 from an available subcarrier set G as a pilot arrangement of the first transmit antenna, and set G1=G−P1; S2. Perform a cyclic shift on the P1; if a Pi obtained after the shift is a subset of the G1, use the P1 as a pilot arrangement of the ith transmit antenna; or if a Pi obtained after the shift is not a subset of the G1, select a Pi from the G1 as a pilot arrangement of the ith transmit antenna; and set G1=G1−Pi and i=i+1, and repeatedly perform S2 until i is equal to a quantity of transmit antennas.
Abstract:
The present invention relates to the field of communications technologies, and discloses a method for accessing a base station by a terminal, and an apparatus. In this provided solution, after a control base station (CBS) receives an access request message sent by the terminal, the CBS determines, according to received identification information of the terminal and a correspondence between the data base station (DBS) identification (ID) and the identification information of the terminal, a DBS ID that accesses the terminal; then a DBS corresponding to the DBS ID allocates access resource information to the terminal; finally, the terminal accesses the DBS. Therefore, the terminal can also access the DBS even if there is no cell ID in a cell covered by the DBS, thereby avoiding a problem that the terminal cannot access the base station when accessing the base station in a data and signaling separation network.
Abstract:
Embodiments of the present invention provide a capacity station activation method and system. A coverage station sends activation control information to a capacity station, where the activation control information enables the capacity station to send a pilot signal to a user in a power decreasing manner; receives a pilot signal measurement result from the user; determines, according to the measurement result, a capacity station that needs to be activated to meet a system requirement; and sends activation information to the determined capacity station that needs to be activated. According to the capacity station activation method and system provided by the embodiments of the present invention, the capacity station that needs to be activated can be more accurately determined, transmit power of an activated capacity station can be controlled, and power consumption of an entire system can be reduced.