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US 8,885,569 B2Granted
Beamforming signaling in a wireless network
AssigneeOfinno Technologies, LLC
InventorEsmael Hejazi Dinan
Life of this patent
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Abstract
A first base station receives a message from a second base station. The second base station comprises a downlink carrier comprising downlink resource blocks. The message comprises downlink beamforming information element indicating a beamforming codeword employed for a downlink resource block. The first base station obtains channel state input information for a wireless device based on, at least in part, processing the downlink beamforming information. The first base station transmits the channel state input information to the wireless device.
Claims20
A method comprising:
- a) receiving, by a first base station from a second base station, at least one application protocol message, said first base station and said second base station configured to communicate with wireless devices employing a downlink carrier, said downlink carrier comprising a plurality of resource blocks, said at least one application protocol message comprising a downlink beamforming information element for at least one resource block in said downlink carrier, said downlink beamforming information element indicating a second beamforming codeword employed by said second base station for said at least one resource block, said second beamforming codeword included in a second beamforming codebook;
- b) computing, by said first base station, a channel state input information element for a wireless device based on, at least in part, processing said downlink beamforming information element;
- and
- c) transmitting, by said first base station, said channel state input information element to said wireless device for computing a precoding matrix indicator;
- and
- d) receiving, by said first base station, a channel state feedback from said wireless device, said channel state feedback comprising said precoding matrix indicator.
3 more elements
A method comprising:
- a) receiving, by a wireless device, a control message from a first base station, said control message comprising:
- i) an identifier of a second base station in said plurality of base stations;
- and
- ii) a channel state input information element based, at least in part, on a downlink beamforming information element received by said first base station from a second base station, said downlink beamforming information element indicating a beamforming codeword employed by said second base station for at least one downlink resource block;
- b) measuring, by said wireless device, reference signals received from said second base station;
- c) processing, by said wireless device, said measured reference signals based, at least in part, on said channel state input information element to compute a precoding matrix indicator;
- and
- d) transmitting, by said wireless device, channel state information comprising said precoding matrix indicator to said first base station.
5 more elements
A wireless device comprising:
- a) one or more communication interfaces;
- b) one or more processors;
- and
- c) memory storing instructions that, when executed, cause said wireless device to:
- i) receive from a first base station, a channel state input information element based, at least in part, on a downlink beamforming information element received by said first base station from a second base station, said downlink beamforming information element indicating a beamforming codeword employed by said second base station for at least one downlink resource block;
- ii) compute a precoding matrix indicator employing said channel state input information element;
- and
- iii) transmit channel state information comprising said precoding matrix indicator to said first base station.
5 more elements
Dependencies are inferred from the claim text.