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US 8,150,327 B2Granted
Channel sounding techniques for a wireless communication system
AssigneeApple Inc.
InventorsJames W. McCoy, Ning Chen
Life of this patent
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Abstract
A technique for channel sounding in a wireless communication system includes determining respective geometries of multiple subscriber stations with respect to a serving base station. Respective time periods for sounding a channel between the multiple subscriber stations and the serving base station are then set based on the respective geometries of the multiple subscriber stations.
Claims19
A method of channel sounding in a wireless communication system, comprising:
- determining respective geometries of multiple subscriber stations with respect to a serving base station;
- and setting, based on the respective geometries determining, respective time durations periods for sounding a channel between each of the multiple subscriber stations and the serving base station.
A method of channel sounding in a wireless communication system, comprising:
- receiving, at multiple subscriber stations that are assigned to a same uplink channel, respective channel sounding burst schedules;
- and transmitting, from the multiple subscriber stations, respective orthogonal channel sounding symbols on the uplink channel based on the respective channel sounding burst schedules, wherein the respective orthogonal channel sounding symbols are created from a channel sounding reference signal sequence using cyclic shifts and include one or more blank cyclic shifts that are not assigned to one of the multiple subscriber stations;
- determining respective geometries of the multiple subscriber stations with respect to a serving base station;
- assigning the respective channel sounding burst schedules to each of the multiple subscriber stations for the uplink channel over respective integration time periods that are less than a coherence time of the uplink channel;
- and communicating, to the multiple subscriber stations, the respective channel sounding burst schedules.
2 more elements
A wireless communication system, comprising:
- a base station configured to determine respective geometries of multiple subscriber stations with respect to the base station;
- and
- a scheduler configured to set respective time durations for sounding a channel between the multiple subscriber stations and the base station based on the respective geometries of the multiple subscriber stations.
Dependencies are inferred from the claim text.