Base station, communication system and method thereof
AssigneeNtt Docomo, Inc.
InventorsChongning Na, Xiaolin Hou, Atsushi Harada, Hidetoshi Kayama
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Abstract
The present disclosure provides a base station, a communication system and a method thereof. The communication system includes three base stations adjacent to each other, and each base station serves at least one UE. The method includes: acquiring, by each base station, a channel matrix of a channel from the base station to an adjacent base station; calculating an interference alignment-based transmission precoding matrix for each base station based on the channel matrices of the channels between the base stations; and precoding, by each base station, data to be transmitted with the interference alignment-based transmission precoding matrix.
Claims10
A method for use in a communication system, the communication system comprising three base stations adjacent to each other, each base station serving at least one user equipment (UE), the method comprising:
- acquiring, by each base station, a channel matrix of a channel from the base station to an adjacent base station;
- calculating an interference alignment-based transmission precoding matrix for each base station based on the channel matrices of the channels between the base stations;
- and
- precoding, by each base station, data to be transmitted with the interference alignment-based transmission precoding matrix,
- wherein the method further comprises:
- acquiring an instantaneous downlink channel matrix and instantaneous downlink channel quality information of a channel from each base station to the UE which the base station serves;
- multiplying the instantaneous downlink channel matrix by the interference alignment-based transmission precoding matrix, so as to obtain an equivalent channel matrix;
- optimizing based on the equivalent channel matrix and the instantaneous downlink channel quality information according to a predetermined optimization criterion, so as to obtain an optimized transmission precoding matrix;
- and
- precoding the data to be transmitted using the optimized transmission precoding matrix.
A method for use in a communication system, the communication system comprising three base stations adjacent to each other and a central device, each base station serving at least one UE, the method comprising:
- acquiring, by each base station, a channel matrix of a channel from the base station to an adjacent base station;
- transmitting, by each base station, the acquired channel matrix to the central device;
- calculating, by the central device, an interference alignment-based transmission precoding matrix for each base station based on the channel matrices of the channels between the base stations, and transmitting the calculated transmission precoding matrix to each base station;
- and
- precoding, by each base station, data to be transmitted using the calculated transmission precoding matrix,
- wherein the method further comprises:
- acquiring an instantaneous downlink channel matrix and instantaneous downlink channel quality information of a channel from each base station to the UE which the base station serves;
- multiplying, by each base station, the instantaneous downlink channel matrix by the interference alignment-based transmission precoding matrix acquired from the central device, so as to obtain an equivalent channel matrix;
- optimizing, by each base station, based on the equivalent channel matrix and the instantaneous downlink channel quality information according to a predetermined optimization criterion, so as to obtain an optimized transmission precoding matrix;
- and
- precoding the data to be transmitted using the optimized transmission precoding matrix.
A base station for use in a communication system, the communication system comprising a plurality of base stations adjacent to each other, each base station serving at least one UE, the base station comprising:
- a channel matrix acquisition unit configured to acquire a channel matrix of a channel between the base stations;
- an interference alignment-based matrix calculation unit configured to calculate an interference alignment-based transmission precoding matrix for the base station based on the channel matrices of the channels between the base stations;
- and
- a transmission precoding unit configured to precode data to be transmitted using the calculated transmission precoding matrix,
- wherein the base station further comprises:
- an instantaneous channel state information acquisition unit configured to acquire instantaneous downlink channel state information of a channel from the base station to the UE which the base station serves, so as to obtain an instantaneous downlink channel matrix and instantaneous downlink channel quality information;
- and
- an optimized precoding matrix calculation unit configured to multiply the instantaneous downlink channel matrix by the interference alignment-based transmission precoding matrix so as to obtain an equivalent channel matrix, and optimize based on the equivalent channel matrix and the instantaneous downlink channel quality information according to a predetermined optimization criterion so as to obtain an optimized transmission precoding matrix,
- wherein the transmission precoding unit is further configured to precode the data to be transmitted using the optimized transmission precoding matrix.
Dependencies are inferred from the claim text.