Codebook subsampling for multi-antenna transmit precoder codebook

摘要

Embodiments provide approaches for sub-sampling a two-component precoder codebook to reduce the overhead associated with signaling the codebook in periodic Channel State Information (CSI) reports from a user equipment (UE) to a base station. In one embodiment, a first component of the codebook is sub-sampled to accommodate a payload capacity of a Physical Uplink Control Channel (PUCCH) CSI Report of Type 1. In another embodiment, both the first component and the second component of the codebook are sub-sampled to accommodate a maximum payload capacity associated with a PUCCH CSI report.

主权项

1. A User Equipment (UE), comprising:
processor circuitry configured to:
generate an estimate of a downlink channel from a base station;select a precoder matrix, based on the estimate, from a first precoder codebook when the precoder matrix is for signaling on an aperiodic uplink resource; andselect a first component and a second component of the precoder matrix, based on the estimate, from a second precoder codebook when the precoder matrix is for signaling on a periodic uplink resource, wherein the second precoder codebook is a joint sub-sampled codebook that is a sub-sampled version of the first precoder codebook; and transceiver circuitry configured to transmit the precoder matrix to the base station.