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.
The teachings herein present a method (700 900) and apparatus (10 12) that implement and use a factorized precoder structure that is advantageous in terms of performance and efficiency. In particular the teachings presented herein disclose an underlying precoder structure that allows for certain codebook reuse across different transmission scenarios including for transmission from a single Uniform Linear Array (ULA) of transmit antennas (14) and transmission from cross-polarized subgroups of such antennas (14). According to this structure an overall precoder (36) is constructed from a conversion precoder (32) and a tuning precoder (34). The conversion precoder (32) includes antenna-subgroup precoders (38) of size ?/ ?/2 where NT represents the number of overall antenna ports (98) considered. Correspondingly the tuning precoder (34) controls the offset of beam phases between the antenna-subgroup precoders (38) allowing the conversion precoder (32) to be used with cross-polarized arrays of ?/?/2 antenna elements and with co-polarized arrays of ?/? antenna elements.
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Technologies
Resource configuration Channel Status Information(CSI) Reporting Multiple-Input Multiple-Output(MIMO)/Massive MIMO
Product
User Equipment (UE/Terminal)Base Station (eNB/gNB)
Use Cases
Wireless communication
Services
Data processing
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