Beamforming signaling in a wireless network
First Claim
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1. A method for use in a wireless device, the method comprising:
- receiving, from a first base station, a measurement information message comprising at least one information element;
computing a precoding matrix indicator (PMI) based at least in part on the at least one information element and on first signals received from one or more antenna ports of the first base station and second signals received from one or more antenna ports of a second base station;
transmitting channel state information comprising the PMI to the first base station; and
receiving, from the first base station, at least one data packet beamformed according to a precoding matrix identified based on the PMI.
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Abstract
A wireless receives at least one channel state input information element (IE) from a first base station. The wireless device computes a precoding matrix indicator (PMI) employing, at least in part, the at least one channel state input IE and measurement of signals received from a second base station. The wireless device transmits the PMI to the first base station.
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Citations
42 Claims
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1. A method for use in a wireless device, the method comprising:
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receiving, from a first base station, a measurement information message comprising at least one information element; computing a precoding matrix indicator (PMI) based at least in part on the at least one information element and on first signals received from one or more antenna ports of the first base station and second signals received from one or more antenna ports of a second base station; transmitting channel state information comprising the PMI to the first base station; and receiving, from the first base station, at least one data packet beamformed according to a precoding matrix identified based on the PMI. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless device comprising:
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one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the wireless device to; receive, from a first base station, a measurement information message; compute a precoding matrix indicator (PMI) based at least in part on at least one information element in the measurement information message and on first signals received from one or more antenna ports of the first base station and second signals received from one or more antenna ports of a second base station; transmit channel state information comprising the PMI to the first base station; and receive, from the first base station, at least one data packet beamformed according to a precoding matrix identified based on the PMI. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A first base station comprising:
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one or more processors; and memory storing instructions that, when executed by the one or more processors, cause the first base station to; transmit, to a wireless device, a measurement information message; receive, from the wireless device, channel state information comprising a precoding matrix indicator (PMI) computed based at least in part on at least one information element in the measurement information message and on first signals received from one or more antenna ports of the first base station and second signals received from one or more antenna ports of a second base station; and transmit, to the wireless device, at least one data packet employing beamforming according to a precoding matrix identified based on the PMI. - View Dependent Claims (24, 25, 26, 27, 28, 29, 30, 31, 32)
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33. A method for use in a base station, the method comprising:
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transmitting, by the base station and to a wireless device, a measurement information message; receiving, by the base station and from the wireless device, channel state information comprising a precoding matrix indicator (PMI) computed based at least in part on at least one information element in the measurement information message and on first signals received by the wireless device from one or more antenna ports of the base station and second signals received by the wireless device from one or more antenna ports of a second base station; and transmitting, by the base station, at least one data packet employing beamforming according to a precoding matrix identified based on the PMI. - View Dependent Claims (34, 35, 36, 37, 38, 39, 40, 41, 42)
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Specification