Patent ID: 8046022
Filing Date: 2011-10-25
Classification: H04L,H04W

Abstract:
1. A method for correcting transmission parameters, the method comprising: wirelessly communicating with a client station; transmitting to the client station a sounding command to instruct the client station to transmit a sounding signal; receiving in an uplink the sounding signal from the client station; determining channel characteristics based at least partly on the sounding signal; determining one or more signal transmission correction parameters for at least one of timing adjustment, power adjustment, or frequency adjustment based at least partly on the determined channel characteristics; and transmitting in a downlink to the client station a message including the one or more correction parameters further comprising requesting the client station to transmit the sounding signal via a sounding command that identifies one or more client stations to transmit the sounding signal, and wherein the sounding command specifies one or more characteristics of the sounding signal to be used by the one or more client stations, wherein requesting the client station to transmit a sounding signal further comprises: requesting the client station to periodically repeat the sounding signal; and correspondingly receiving the repeated sounding signals, re-determining channel characteristics, re-determining one or more correction parameters, and retransmitting messages to the client station to correct transmission parameters.