Parameterized Codebook with Subset Restrictions for Use With Precoding MIMO Transmissions

摘要

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.

主权项

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.