Scheduling multi-user transmission in the downlink of a multi-antenna wireless communication system
First Claim
1. A method of controlling a radio frequency transmission, over a downlink to at least one mobile station user among a plurality of mobile station users, from a plurality of antennas associated with a base station in a wireless communication system, the method comprising:
- tracking, at the base station, a channel corresponding to the at least one mobile station user based on feedback information indicative of at least one complex channel gain seen by said at least one mobile station user, wherein the channel comprises tracking the channel using said at least one complex channel gain instead of feedback of each full channel of the user channels, the channel tracking comprising performing a real-time estimate of values of a matrix representation of the channel corresponding to said at least one mobile station user, the feedback information being provided at a rate selected by the base station; and
scheduling, at the base station and for the at least one of the mobile station user, a directional downlink transmission based on the tracked channels of said plurality of mobile station users, said scheduling being performed using a proportionally fair algorithm.
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Abstract
The present invention provides a method and an apparatus for controlling a radio frequency transmission, over a downlink to at least one mobile station user among a plurality of mobile station users, from a plurality of antennas associated with a base station in a wireless communication system. The method includes tracking a channel corresponding to the mobile station user of the plurality of mobile station users based on feedback information indicative of a state of the channel therefrom. The method further includes scheduling, for the at least one mobile station user, a directional transmission based on the tracked channels of the plurality of mobile station users.
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Citations
21 Claims
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1. A method of controlling a radio frequency transmission, over a downlink to at least one mobile station user among a plurality of mobile station users, from a plurality of antennas associated with a base station in a wireless communication system, the method comprising:
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tracking, at the base station, a channel corresponding to the at least one mobile station user based on feedback information indicative of at least one complex channel gain seen by said at least one mobile station user, wherein the channel comprises tracking the channel using said at least one complex channel gain instead of feedback of each full channel of the user channels, the channel tracking comprising performing a real-time estimate of values of a matrix representation of the channel corresponding to said at least one mobile station user, the feedback information being provided at a rate selected by the base station; and scheduling, at the base station and for the at least one of the mobile station user, a directional downlink transmission based on the tracked channels of said plurality of mobile station users, said scheduling being performed using a proportionally fair algorithm. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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20. A method of controlling a radio frequency transmission, over a downlink to at least one mobile station user among a plurality of mobile station users, from a plurality of antennas associated with a base station in a wireless communication system, the method comprising:
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tracking, at the base station, a channel corresponding to the at least one mobile station user based on feedback information indicative of a state of the channel therefrom, the channel tracking comprising performing a real-time estimate of values of a matrix representation of the channel corresponding to said at least one mobile station user, the feedback information being provided at a rate selected by the base station to support scheduling of a directional downlink transmission from the base station to said at least one mobile station user over the tracked channel;
wherein tracking a channel corresponding to the at least one mobile station user of said plurality of mobile station users further comprises tracking the channel corresponding to each mobile station user of said plurality of mobile station users in an adaptive time using Kalman filtering to perform the estimate of the matrix representative of the channel corresponding to said at least one mobile station user; andscheduling, at the base station and for the at least one the mobile station user, the directional downlink transmission based on the tracked channels of said plurality of mobile station users, said scheduling being performed using a proportionally fair algorithm, wherein scheduling a directional downlink transmission to the mobile station user further comprises; generating a plurality of indications for the directional downlink transmission based on the tracked channel of the scheduled mobile station user; and using said plurality of antennas associated with said base station to transmit the radio frequency transmission to the scheduled mobile station user.
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21. A method of controlling a radio frequency transmission, over a downlink to at least one mobile station user among a plurality of mobile station users, from a plurality of antennas associated with a base station in a wireless communication system, the method comprising:
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tracking, at the base station, a channel corresponding to the at least one mobile station user based on feedback information indicative of a state of the channel therefrom, the channel tracking comprising performing a real-time estimate of values of a matrix representation of the channel corresponding to said at least one mobile station user, the feedback information being provided at a rate selected by the base station to support scheduling of a directional downlink transmission from the base station to said at least one mobile station user over the tracked channel;
wherein tracking a channel corresponding to the at least one mobile station user of said plurality of mobile station users further comprises tracking the channel corresponding to each mobile station user of said plurality of mobile station users in a real time using Kalman filtering to perform the real-time estimate of the matrix representative of the channel corresponding to said at least one mobile station user; andscheduling, at the base station and for the at least one the mobile station user, the directional downlink transmission based on the tracked channels of said plurality of mobile station users, said scheduling being performed using a proportionally fair algorithm, wherein scheduling a directional downlink transmission to the mobile station user further comprises; generating a plurality of indications for the directional downlink transmission based on the tracked channel of the scheduled mobile station user; and using said plurality of antennas associated with said base station to transmit the radio frequency transmission to the scheduled mobile station user.
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Specification