Uplink feedback channel reporting mechanism in wireless systems
An uplink feedback channel reporting method is disclosed for using the primary and secondary fast feedback channels to efficiently report the channel quality, MIMO feedback, and CQI types of data from a mobile station to a base station. The reporting method reports regular information periodically and non-regular information on demand.
1. An uplink feedback channel reporting method, comprising:
periodically reporting regular information to a base station using a feedback channel, wherein the regular information comprises channel quality indicator (CQI) information, rank indicator information, or both CQI and rank indicator information, the CQI information further comprising average CQI comprising a single average CQI measure across selected multiple sub-bands, wherein obtaining the average CQI involves calculating a differential CQI between a previous frame and a current frame and between the current frame and a next frame;
wherein
if, during the periodic reporting of the CQI information to the base station, the average CQI is reported together with the differential CQI, then the reporting is done in the frequency domain; and
if, during the periodic reporting of the CQI information to the base station, the average CQI is reported in a different time period than the differential CQI, then the reporting of a first differential CQI, reported right after the average CQI, comprises a frequency domain measurement, while the reporting of a subsequent differential CQI comprises a time domain measurement.
2. The uplink feedback channel reporting method of claim 1 , periodically reporting regular information to a base station using a feedback channel further comprising:
separately reporting the CQI and rank information in the same feedback channel using time division multiplexing, wherein:
the CQI information is reported in each frame of the feedback channel; and
the rank information is periodically reported in a frame of the feedback channel, wherein the rank information punctures the CQI information in the frame;
wherein the rank information is reported less often than the CQI information to the base station.