Method and system for control channel beamforming
First Claim
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1. A method comprising:
- at a base station, dividing a coverage area into a number of segments;
assigning a unique set of transmit subcarriers from a plurality of subcarriers for multiple subcarrier transmission to each of the segments;
applying beamforming to each of the unique sets of transmit subcarriers to form a transmit beam pattern for each segment, wherein each unique set of beamformed transmit subcarriers has control information carried in a subset of subcarriers within a corresponding unique set of beamformed transmit subcarriers; and
transmitting a different predetermined preamble to each of the segments using a corresponding unique set of beamformed transmit subcarriers, wherein each different preamble is configured to indicate to a subscriber station a spectrum location of the subset of subcarriers carrying the control information within the corresponding unique set of beamformed transmit subcarriers; and
receiving a response from a subscriber station indicating a selected preamble detected at a highest power level by the subscriber station.
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Abstract
A system and method for managing control information in a wireless communications system. The method comprises broadcasting a predetermined number of preambles through beamforming from a base station, detecting, by a subscriber station, a predetermined frame associated with one selected preamble that has the highest power level, and identifying one or more subcarriers for carrying control information through the selected preamble.
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Citations
19 Claims
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1. A method comprising:
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at a base station, dividing a coverage area into a number of segments; assigning a unique set of transmit subcarriers from a plurality of subcarriers for multiple subcarrier transmission to each of the segments; applying beamforming to each of the unique sets of transmit subcarriers to form a transmit beam pattern for each segment, wherein each unique set of beamformed transmit subcarriers has control information carried in a subset of subcarriers within a corresponding unique set of beamformed transmit subcarriers; and transmitting a different predetermined preamble to each of the segments using a corresponding unique set of beamformed transmit subcarriers, wherein each different preamble is configured to indicate to a subscriber station a spectrum location of the subset of subcarriers carrying the control information within the corresponding unique set of beamformed transmit subcarriers; and receiving a response from a subscriber station indicating a selected preamble detected at a highest power level by the subscriber station. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15, 16, 17, 19)
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8. A method comprising:
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at a base station in a wireless communications system, dividing a coverage area into a predetermined number of segments; assigning a unique set of transmit subcarriers from a plurality of subcarriers for multiple subcarrier transmission to each of the segments; applying beamforming to each of the unique sets of transmit subcarriers to form a transmit beam pattern for each segment, wherein each unique set of beamformed transmit subcarriers has control information carried in a subset of subcarriers within a corresponding unique set of beamformed transmit subcarriers; transmitting a different predetermined preamble to each of the segments using a corresponding assigned unique set of beamformed transmit subcarriers, wherein each different preamble is configured to indicate to a subscriber station a spectrum location of the subset of subcarriers carrying the control information; detecting, by a subscriber station, one of the different predetermined preambles that has a highest power level; identifying one or more subcarriers carrying the control information based on information contained in the detected preamble; and continuing communication between the base station and the subscriber station based on the control information. - View Dependent Claims (9, 10, 11, 12, 13, 14, 18)
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Specification