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US 9,002,279 B2Granted
System and method for aligning interference in uplink
AssigneeSamsung Electronics Co., Ltd.
InventorsWon Jae Shin, Nam Yoon Lee, Chang Yong Shin, Kyung Hun Jang, Won Jong Noh, Hyun Ho Choi
Life of this patent
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Abstract
Provided is a method of generating a transmit beamforming vector and a receive beamforming vector to substantially eliminate the effect of interference transmitted from macro terminals to a pico base station in a hierarchical cell environment. Also, provided is a method of selecting, from a plurality of macro terminals, a macro terminal for transmitting data to a macro base station.
Claims21
A pico base station, comprising:
- a channel matrix generator configured to generate a first channel matrix by estimating a channel between the pico base station and a pico terminal;
- a beamforming vector generator configured to generate a transmit beamforming vector of the pico terminal and a transmit beamforming vector of a macro terminal distinct from the pico terminal, based on the first channel matrix between the pico base station and the pico terminal, the transmit beamforming vector of the pico terminal to be applied by the pico terminal to a data stream to transmit-beamform the data stream, and the transmit beamforming vector of the macro terminal to be applied by the macro terminal to a signal to transmit-beamform the signal;
- a transmitter configured to transmit, to the pico terminal, the generated transmit beamforming vector of the pico terminal, and transmit, to the macro terminal, the generated transmit beamforming vector of the macro terminal;
- and
- a receiver configured to receive, from the pico terminal, the data stream that is transmit-beamformed by the pico terminal according to the transmitted transmit beamforming vector of the pico terminal.
2 more elements
A macro base station, comprising:
- a signal quality information generator configured to generate signal quality information of each of channels formed between the macro base station and each of macro terminals;
- a threshold value setting unit configured to set a signal quality threshold value to be greater than a predetermined reference value in response to a number of the macro terminals being less than a predetermined threshold value,
- a terminal grouping unit configured to determine terminal groups from the macro terminals, based on the signal quality information, one of the terminal groups comprising the macro terminals that each comprise a value of the signal quality information that is greater than the signal quality threshold value;
- a data rate predictor configured to predict a data rate of each of the terminal groups by scheduling each of the terminals groups;
- and
- a terminal selector configured to select, from the terminal groups, a terminal group to receive data from the macro base station, based on the predicted data rate.
3 more elements
A method of transmitting and receiving at a macro terminal, the method comprising:
- receiving, by a receiver of the macro terminal, a transmit beamforming vector from a pico base station, the pico base station receiving a transmit-beamformed first data stream from a pico terminal distinct from the macro terminal, and the transmit beamforming vector to be applied by the macro terminal to a second data stream to transmit-beamform the second data stream;
- transmit-beamforming, by a transmitter of the macro terminal, the second data stream according to the received transmit beamforming vector;
- and
- transmitting, by the transmitter, the transmit-beamformed second data stream to a macro base station,
- wherein the transmit beamforming vector is calculated based on a channel matrix of a channel formed between the pico terminal and the pico base station.
2 more elements
Dependencies are inferred from the claim text.