Codebook sub-sampling for CSI feedback on PUCCH for 4Tx MIMO
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United States of America Patent
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Jan 23, 2018
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Jul 29, 2016
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Feb 25, 2013
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Abstract
Channel state information (CSI) feedback in a wireless communication system (100) is disclosed. User equipment (107) transmits a CSI feedback signal via a Physical Uplink Control CHannel (PUCCH) (108). If the UE is configured in a first feedback mode, the CSI comprises a first report jointly coding a Rank Indicator (RI) and a first precoding matrix indicator (PMI1) (203), and a second report coding Channel Quality Indicator (CQI) and a second precoding matrix indicator (PMI2)(204). If the UE is configured in a second feedback mode, the CSI comprises a first report coding RI (205), and a second report coding CQI, PMI1 and PMI2 (206). The jointly coded RI and PMI1 employs codebook sub-sampling, and the jointly coding PMI1, PMI2 and CQI employs codebook sub-sampling.
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