A channel quality feedback method for wireless transmission is described
in which the rate for reporting channel quality information from a mobile
station to a base station is variable as a function of the presence or
absence of a transmission from the base station to the mobile station. In
particular, the feedback rate from the mobile station to the base station
is increased when the mobile station detects a transmission from the base
station. As such, the feedback rate is slower when there is no data
transmission for the mobile station and faster when the mobile station is
receiving data.