DOWNLINK SIGNALING FOR PARTIALLY PRECODED CSI-RS AND CSI FEEDBACK

摘要

User equipment (UE) is configured to receive two types of channel state information (CSI) reference signals (CSI-RS), the first containing more antenna ports and measured less often than the second. A first CSI report is based on first type CSI-RS and a second CSI report on the second type CSI-RS. The second type CSI-RS is at least partially precoded in response to the first CSI report, is precoded for the specific UE, and is transmitted more often than the first type CSI-RS, while the first type CSI-RS is not precoded. The first CSI report contains a first precoding matrix indicator (PMI) parameter and the second CSI report contains only a second PMI parameter of a two-PMI codebook, where the first PMI parameter is a long-term and wideband PMI. The first PMI is derived from measuring the first type CSI-RS in a plurality of subframes and resource blocks.

主权项

1. A base station, comprising:
a transmitter configured to transmit a signal configuring a user equipment with receiving two channel state information (CSI) reference signal (CSI-RS) resources, wherein a first of the CSI-RS resources contains more ports and is measured less often than a second of the CSI-RS resources; a receiver configured to receive two types of CSI reports from the user equipment, a first of the CSI reports associated with the first CSI-RS resource and a second of the CSI reports associated with the second CSI-RS resource; and a controller configured to precode the second CSI-RS resource in response to the first CSI report, wherein the transmitter is configured to transmit the first CSI-RS resource in a first set of subframes and the second CSI-RS resource in a second set of subframes.