PARAMETERIZED CODEBOOK SUBSETS FOR USE WITH PRECODING MIMO TRANSMISSIONS
First Claim
1. A method in a second wireless communication transceiver of providing precoder selection feedback to a first wireless communication transceiver as precoding information for said first transceiver, said method comprising:
- determining channel conditions at the second transceiver;
operating in a first feedback mode, selecting a precoder from a predetermined set of precoders based on said channel conditions, sending a full-range index value, with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said first transceiver as said precoder selection feedback;
operating in a second feedback mode, selecting a precoder from a smaller, predetermined subset of precoders contained within the predetermined set of precoders based on said channel conditions, and sending a smaller-range index value, with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said first transceiver as said precoder selection feedback; and
using a smaller signaling payload for sending smaller-range index values as compared to the signaling payload used to send full-range index values.
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Abstract
One aspect of the teachings presented herein provides advantages for sending precoder selection feedback from a transceiver to another transceiver, for use by the other transceiver as precoding recommendations. The transceiver generates two types of precoder selection feedback, where one type uses a smaller signaling payload than the other and therefore provides a distinct reduction in the signaling overhead associated with reporting precoding recommendations. The transceiver uses the reduced-overhead type of reporting when reporting at certain times, or on certain channels, or in response to control signaling. In one example, a UE in an LTE network sends precoder information to an eNodeB on the PUCCH by sending smaller-range index values that index only a subset of precoders, but sends full-range index values when reporting on the PUSCH, which index a larger set of precoders.
17 Citations
30 Claims
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1. A method in a second wireless communication transceiver of providing precoder selection feedback to a first wireless communication transceiver as precoding information for said first transceiver, said method comprising:
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determining channel conditions at the second transceiver; operating in a first feedback mode, selecting a precoder from a predetermined set of precoders based on said channel conditions, sending a full-range index value, with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said first transceiver as said precoder selection feedback; operating in a second feedback mode, selecting a precoder from a smaller, predetermined subset of precoders contained within the predetermined set of precoders based on said channel conditions, and sending a smaller-range index value, with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said first transceiver as said precoder selection feedback; and using a smaller signaling payload for sending smaller-range index values as compared to the signaling payload used to send full-range index values. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wireless communication transceiver configured to provide precoder selection feedback to another wireless communication transceiver as precoding information for said other transceiver, said transceiver comprising a receiver configured to receive signals from said other transceiver and a channel estimator configured to estimate channel conditions at said transceiver with respect to signals received from said other transceiver, and said transceiver comprising:
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a transmitter configured to transmit signals to said other transceiver, including signals conveying said precoder selection feedback; and a precoding feedback generator configured to determine whether to operate in a first feedback mode or a second feedback mode and further configured to; when operating in the first feedback mode, select a precoder from a predetermined set of precoders based on said channel conditions and send a full-range index value, with the ability to indicate any of the precoders in the predetermined set, for the selected precoder to said other transceiver as said precoder selection feedback; and when operating in the second feedback mode, select a precoder from a predetermined subset of precoders contained in said predetermined set of precoders based on said channel conditions and send a smaller-range index value, with the ability to only indicate precoders within the predetermined subset of precoders, for the selected precoder to said other transceiver as said precoder selection feedback; wherein said precoding feedback generator is configured to use a smaller signaling payload for sending smaller-range index values as compared to the signaling payload used to send full-range index values. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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19. A method at a first wireless communication transceiver of determining a precoder recommendation from a second wireless communication transceiver, said method comprising:
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receiving precoder selection feedback from the second transceiver; determining whether the precoder selection feedback comprises a first type of precoder selection feedback including a full-range index value, or a second type of precoder selection feedback including a smaller-range index value that is signaled by the second transceiver using a lower signaling overhead as compared to that used for signaling full-range index values; if the precoder selection feedback is the first type of precoder selection feedback, identifying the precoder recommendation by identifying a precoder from a predetermined set of precoders indexed by the full-range index value included in the precoder selection feedback; if the precoder selection feedback is the second type of precoder selection feedback, identifying the precoder recommendation by identifying a precoder from a predetermined subset of precoders indexed by the smaller-range index value included in the precoder selection feedback, said predetermined subset of precoders contained within the predetermined set of precoders; and determining a precoding operation for precoding a transmission to the second transceiver based at least in part on the precoder recommendation. - View Dependent Claims (20, 21, 22, 23, 24, 25)
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26. A wireless communication transceiver configured to determine a precoder recommendation from another wireless communication transceiver, said transceiver comprising:
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a receiver configured to receive precoder selection feedback from the other transceiver; a feedback processor configured to determine whether the precoder selection feedback comprises a first type of precoder selection feedback including a full-range index value, or a second type of precoder selection feedback including a smaller-range index value that is signaled by the other transceiver using a lower signaling overhead as compared to that used for signaling full-range index values; said feedback processor configured to; if the precoder selection feedback is the first type of precoder selection feedback, identify the precoder recommendation by identifying a precoder from a predetermined set of precoders indexed by the full-range index value included in the precoder selection feedback; and if the precoder selection feedback is the second type of precoder selection feedback, identify the precoder recommendation by identifying a precoder from a predetermined subset of precoders indexed by the smaller-range index value included in the precoder selection feedback, said predetermined subset of precoders contained within the predetermined set of precoders; and wherein said feedback processor or an associated precoding controller is configured to determine a precoding operation for precoding a transmission to the other transceiver based at least in part on the precoder recommendation. - View Dependent Claims (27, 28, 29, 30)
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Specification