Using multiple and a single feedback for ue uplink beamforming in soft handoff
AssigneeGoogle Inc.
InventorHaim HAREL
Life of this patent
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Abstract
Embodiments of the present invention describe methods for increasing the amount of information available to a mobile transmit diversity transmitter during soft handoff. According to embodiments of the invention, a transmit diversity transmitter may determine substantially when it is in uplink communication with one base station and downlink communication with another base station. The mobile device may transmitting a diversity signal by controlling a value of a transmit diversity parameter based on feedback signals from the downlink base station, and controlling a power level in accordance with a standard protocol, e.g. combination of transmit power control feedbacks provided by the active base stations.
Claims12
A method of controlling a mobile communication device comprising:
- determining that a mobile communication device is a vicinity of first and second base stations, wherein the mobile device is in uplink communication with the first base station and downlink communication with the second base station;
- and
- transmitting a diversity signal from first and second antennas differing by a transmit diversity parameter by:
- controlling a value of the transmit diversity parameter based on feedback signals from the second base station;
- and
- controlling a power level in accordance with the standard protocol requirements.
A mobile communication apparatus comprising:
- a processor to:
- determine that a mobile communication device is a vicinity of first and second base stations, wherein the mobile device is in uplink communication with the first base station and downlink communication with the second base station,
- determine a value of the transmit diversity parameter based on feedback signals from the second base station, and
- determine a power level in accordance with a standard protocol requirements;
- and
- a transmitter to transmit a diversity signal on first and second antennas using the determined transmit diversity parameter and the determined power level.
Dependencies are inferred from the claim text.