Channel quality feedback in multicarrier systems

摘要

A wireless communication system facilitates multichannel periodic and aperiodic feedback (e.g., Channel Quality Indicator (CQI), Rank indicator (RI), Precoding Matrix Indicator (PMI)) from a population of user equipment while facilitating legacy single carrier communication. Paired downlink (DL)/uplink (UL) or many-to-one mapping communication can be established by common system information or dedicated signaling. In one aspect, a flag sent by system information or by dedicated signaling can indicate which means controls. Feedback can be configured for each carrier independently reported in a concatenated in frequency fashion, reported in a cycle in time fashion, or reported in a staggered in time and frequency fashion. Feedback can be reported jointly as one wide bandwidth. Feedback can be a single report perhaps reported on a data channel for more capacity or by cycled carrier/subband reporting.

主权项

1. A method for transmitting uplink feedback for multiple downlink carriers, comprising:
receiving a plurality of downlink carriers, each of the plurality of downlink carriers comprising a different frequency range from other carriers of the plurality of downlink carriers; determining an uplink carrier assigned for feedback for the plurality of downlink carriers; determining which downlink carrier of the plurality of downlink carriers has precedence if a collision occurs between a first feedback for at least one of the plurality of downlink carriers and a second feedback for a different one of the plurality of downlink carriers, wherein carrier precedence is determined based at least in part on:
a type of feedback when the collision occurs between different types of feedback, andradio resource control (RRC) signaling when the collision occurs between a same type of feedback; and reporting the first or second feedback on the uplink carrier based on the determined carrier precedence.