Feedback Scheduling to Reduce Feedback Rates in MIMO Systems

摘要

In a closed-loop wireless communication system, a codebook-based feedback control mechanism is provided where feedback from each of a plurality of receivers is scheduled to control the feedback so that the receiving devices do not needlessly feed back precoding information to the transmitting device. The feedback may be controlled by establishing and distributing a schedule to control when each receiver feeds back precoding information, or by establishing and distributing a metric-based feedback threshold that must be satisfied before feedback is permitted.

主权项

1. A method for controlling feedback of precoding information in a MIMO communication system comprising a base station and a plurality of user equipment devices, wherein the base station communicates with each user equipment device over a respective transmission channel, the method comprising:
receiving feedback control information at a first user equipment device from a base station, where the feedback control information is generated at the base station to control feedback of precoding information from the plurality of user equipment devices so that the user equipment devices do not needlessly feed back precoding information to the base station; and feeding back precoding information from the first user equipment device to the base station by evaluating the feedback control information at said first user equipment device to determine if precoding information is to be fed back and to determine how much feedback to send.