Parameterized codebook with subset restrictions for use with precoding MIMO transmissions
First Claim
1. A method in a wireless communication transceiver of controlling precoder selection feedback sent to another wireless communication transceiver that precodes transmissions to the transceiver, wherein said precoder selection feedback indicates precoder selections by said transceiver, said method characterized by:
- receiving restriction signaling from the other transceiver that identifies one or more permitted subsets within a defined set of overall precoders, or, where the defined set of overall precoders is represented by defined sets of conversion precoders and tuning precoders, said restriction signaling identifies one or more permitted subsets of precoders, within the defined sets of said conversion precoders and tuning precoders; and
generating said precoder selection feedback for sending to the other transceiver based on restricting precoder selections by said transceiver according to said restriction signaling;
wherein respective combinations of conversion and tuning precoders correspond to respective ones of the overall precoders.
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Accused Products
Abstract
One aspect of the teachings herein relates to signaling codebook restrictions, to restrict the precoder recommendations being fed back from a remote transceiver, so that precoder selections made by the remote receiver are restricted to permitted subsets of overall precoders within a defined set of overall precoders, or to permitted subsets within larger sets of conversion precoders and tuning precoders, for the case where the overall precoders are represented in factorized form by conversion and tuning precoders. As a non-limiting example, these teachings advantageously provide for precoder restrictions in LTE or LTE-Advanced networks, where ongoing development targets the use of larger, richer sets of precoders, and where the disclosed mechanisms for determining, signaling, and responding to subset restrictions provide significant operational advantages.
30 Citations
32 Claims
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1. A method in a wireless communication transceiver of controlling precoder selection feedback sent to another wireless communication transceiver that precodes transmissions to the transceiver, wherein said precoder selection feedback indicates precoder selections by said transceiver, said method characterized by:
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receiving restriction signaling from the other transceiver that identifies one or more permitted subsets within a defined set of overall precoders, or, where the defined set of overall precoders is represented by defined sets of conversion precoders and tuning precoders, said restriction signaling identifies one or more permitted subsets of precoders, within the defined sets of said conversion precoders and tuning precoders; and generating said precoder selection feedback for sending to the other transceiver based on restricting precoder selections by said transceiver according to said restriction signaling; wherein respective combinations of conversion and tuning precoders correspond to respective ones of the overall precoders. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A wireless communication transceiver configured to control precoder selection feedback sent to another wireless communication transceiver that precodes transmissions to the transceiver, wherein said precoder selection feedback indicates precoder selections by said transceiver, said transceiver characterized by:
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a receiver configured to receive restriction signaling from the other transceiver that identifies one or more permitted subsets within a defined set of overall precoders, or, where the defined set of overall precoders is represented by defined sets of conversion precoders and tuning precodes, said restriction signaling identifies one or more permitted subsets of precoders within the defined sets of said conversion precoders and said tuning precoders; and a precoding feedback generator configured to generate said precoder selection feedback for sending to the other transceiver, based on restricting precoder sections by said transceiver according to the restriction signaling; wherein respective combinations of conversion and tuning precoders correspond to respective ones of the overall precoders. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A transceiver configured to precode transmissions to another transceiver based at least in part on receiving precoder selection feedback from the other transceiver that indicates an overall precoder for consideration by said transceiver in precoding to the other transceiver, said transceiver including a receiver for receiving said precoder selection feedback from the other transceiver and characterized by:
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a precoding controller configured to determine a restriction that limits precoder selection by the other transceiver to one or more permitted subsets of overall precoders within a defined set of overall precoders, or to one or more permitted subsets of precoders within defined sets of conversion precoders and tuning precoders, wherein each overall precoder is equivalently represented by a unique combination of one conversion precoder and one tuning precoder within the defined sets, and to generate restriction signaling for indicating said one or more permitted subsets to the other transceiver; and a transmitter cooperatively associated with said precoding controller and configured for transmitting said restriction signaling to the other transceiver; wherein respective combinations of conversion and tuning precoders correspond to respective ones of the overall precoders in the defined set of overall precoders. - View Dependent Claims (22, 23, 24, 25, 26)
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27. A method in a wireless communication transceiver that is configured to precode transmissions to another transceiver based at least in part on receiving precoder selection feedback from said other transceiver that indicates an overall precoder for consideration by said transceiver in precoding to the other transceiver, said method characterized by:
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determining a restriction that limits precoder selection by the other transceiver one or more permitted subsets of overall precoders within a defined set of overall precoders or to one or more permitted subsets of precoders within defined sets of conversion precoders and tuning precoders, wherein each overall precoder is equivalently represented by a unique combination of one conversion precoder and one tuning precoder within the defined sets; generating restriction signaling for indicating the one or more permitted subsets to said other transceiver; and sending the restriction signaling to the other transceiver, to restrict precoder selection by the other transceiver to the one or more permitted subsets; wherein respective combinations of conversion and tuning precoders correspond to respective ones of the overall precoders is the defined set of overall precoders. - View Dependent Claims (28, 29, 30, 31, 32)
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Specification