Multiple CQI feedback for cellular networks
First Claim
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);
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 of the plurality of CQI is formed using a different combination of two or more of the plurality of precoding matrices; and
wherein the feedback comprises two or more PMI identifying the combination of precoding matrices used to form each of the one or more feedback CQI.
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Accused Products
Abstract
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 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, wherein at least two PMI are included in the feedback.
41 Citations
17 Claims
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1. A method of operating a user equipment device in a cellular network, the method comprising:
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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); 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 of the plurality of CQI is formed using a different combination of two or more of the plurality of precoding matrices; and wherein the feedback comprises two or more PMI identifying the combination of precoding matrices used to form each of the one or more feedback CQI. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for operating a base station device in a cellular network, the method comprising:
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transmitting a reference symbol from the base station (eNB) for reception by a user equipment (UE); receiving feedback from the UE comprising one or more feedback CQI selected by the UE from a plurality of CQI formed by the UE 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, wherein at least two PMI are included in the feedback; using the at least two PMI included in the feedback to select a precoding matrix for use by the eNB for transmission of data to the UE; wherein each of the plurality of CQI is formed using a different combination of two or more of the plurality of precoding matrices; and wherein the feedback comprises two or more PMI identifying the combination of precoding matrices used to form each of the one or more feedback CQI. - View Dependent Claims (10, 11, 12, 13, 14, 15)
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16. A base station apparatus, comprising:
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circuitry for transmitting a reference symbol 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 formed by the UE 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, wherein at least two PMI are included in the feedback; and a processor coupled to the circuitry for transmitting and to the circuitry for receiving, the processor operable to use the at least two PMI in the feedback to select a precoding matrix for use by the eNB for transmission of data to the UE; and wherein each of the plurality of CQI is formed using a different combination of two or more of the plurality of precoding matrices, the feedback comprises two or more PMI identifying the combination of precoding matrices used to form each of the one or more feedback CQI, and 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; and wherein the processor is operable to use the feedback from the UE to select precoding matrices for use by the eNB for co-scheduled transmission of data to the UE and to a second UE in multi-user multi-input multi-output (MU-MIMO) mode. - View Dependent Claims (17)
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Specification