Adaptive feedback of channel information for coordinated transmission on a wireless backhaul

摘要

A backhaul link is established between a base station and a relay that assists the base station in communicating with a mobile device over an access link established between the relay and the mobile device. The channel response of the backhaul link is determined by estimating first and second parts of the backhaul link channel response, the second part changing faster than the first part. The first part of the backhaul link channel response is estimated by calculating an average of the backhaul link channel response over a predetermined period at the relay and the second part is estimated by calculating variation in the backhaul link channel response over the predetermined period at the relay. Quantized versions of the first and second parts of the backhaul link channel response are transmitted from the relay to the base station over the backhaul link.

主权项

1. A method of feeding back a channel response estimate of a backhaul link established between a base station and a relay that assists the base station in communicating with a mobile device over an access link established between the relay and the mobile device, the method comprising:
estimating a first part of the backhaul link channel response by calculating an average of the backhaul link channel response over a predetermined period at the relay; estimating a second part of the backhaul link channel response by calculating variation in the backhaul link channel response over the predetermined period at the relay, the second part of the backhaul link channel response changing faster than the first part; and transmitting a quantized version of the first part of the backhaul link channel response and a quantized version of the second part of the backhaul link channel response from the relay to the base station over the backhaul link.