Multiple Rank CQI Feedback for Cellular Networks
AssigneeTexas Instruments Incorporated
InventorsRunhua Chen, Eko Nugroho Onggosanusi
Life of this patent
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Abstract
Single user and multiuser MIMO transmission in a cellular network may be performed by a base station (eNB) transmitting either one, two, or more 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 precoding 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 precoding matrix indicators (PMI) identifying the one or more precoding matrices used to form each of the one or more feedback CQIs for two or more ranks.
Claims18
A method of operating a user equipment device in a cellular network, the method comprising:
- receiving a first reference signal at the user equipment (UE) from a first base station (eNB);
- computing a plurality of channel quality indicators (CQI) for each of two or more ranks derived from at least the first reference signal with one or more of a plurality of precoding matrices;
- and
- transmitting feedback from the UE to the eNB comprising one or more CQI reports selected from the plurality of CQI for each of the two or more ranks, and one or more precoding matrix indicators (PMI) identifying the one or more precoding matrices used to form each of the one or more CQI reports.
A method for operating a base station device in a cellular network, the method comprising:
- transmitting a reference signal from the base station (eNB) for reception by a user equipment (UE);
- receiving feedback from the UE comprising one or more CQI reports selected by the UE from a plurality of CQI reports formed by the UE for each of two or more ranks and one or more precoding matrix indicators (PMI) identifying the one or more precoding matrices used by the UE to form each of the one or more feedback CQIs;
- and
- using the CQI for each of the two or more ranks and the PMI included in the feedback to select a precoding matrix for use by the eNB for transmission of data to the UE in single user or in multiuser transmission.
A base station apparatus, comprising:
- circuitry for transmitting a reference signal from the base station (eNB) for reception by a user equipment (UE);
- circuitry for receiving feedback from the UE comprising one or more feedback CQI selected by the UE from a plurality of CQI reports formed by the UE for each of two or more ranks and one or more precoding matrix indicators (PMI) identifying the one or more precoding matrices used by the UE to form each of the one or more feedback CQIs;
- and
- a processor coupled to the circuitry for transmitting and to the circuitry for receiving, the processor operable to use the CQI for each of the two or more ranks and the PMI included in the feedback to select a precoding matrix for use by the eNB for transmission of data to the UE in single user and/or multiuser transmission.
Dependencies are inferred from the claim text.