Multiple CQI feedback for cellular networks

摘要

Single user and multiuser MIMO transmission in a cellular network may be performed by a base station (eNB) transmitting either one or two transmission layers. A user equipment (UE) receives a reference symbol from the base station. The UE processes the reference symbol with one or more of a plurality of preceding matrices to form a plurality of channel quality indices (CQI). The UE provides feedback to the eNB comprising one or more feedback CQI selected from the plurality of CQI and one or more preceding matrix indicators (PMI) identifying the one or more preceding matrices used to form each of the one or more feedback CQIs, wherein at least two PMI are included in the feedback.

主权项

1. A method of operating a user equipment device in a cellular network, the method comprising:
receiving a first reference symbol at the user equipment (UE) from a first base station (eNB); processing by the UE the first reference symbol with one or more of a plurality of precoding matrices to form a plurality of channel quality indices (CQI), wherein the plurality of CQI is representative of all precoding matrices assigned to the UE, and wherein the entire plurality of CQI and respective precoding matrix indicators are provided as feedback; and providing feedback from the UE to the eNB comprising one or more feedback CQI selected from the plurality of CQI and one or more precoding matrix indicators (PMI) identifying the one or more precoding matrices used to form each of the one or more feedback CQIs, wherein at least two PMI are included in the feedback, wherein each combination of precoding matrices comprise of at least a first precoding matrix recommended for the UE, and a second precoding matrix recommended for a hypothetical UE to be co-scheduled with the UE.