Patent ID: 7986651

Claim:
An event-driven power optimized link adaptation method of controlling link quality for wireless transmission with respect to a battery powered station where PHY parameters are selectively controlled, comprising the steps of: measuring number of frame retransmissions required per time unit (ReTXrate) as a link quality metric: using measured ReTXrate after each packet transmission or periodically at a predefined period for making comparison with lower and higher thresholds for the ReTXrate; using said comparison of measured said ReTXrate for triggering link adaptation by way of changing said PHY parameters; using missing Acknowledgment (ACK) as a second link quality metric in addition to said ReTXrate: using a PHY parameter controller for the step of changing said PHY parameters; and using the PHY parameter controller for estimating required energy E for whole frame exchange using the PHY parameters and applying the formula: E = ( Avg_No ⁢ _of ⁢ _attempts - 1 ) × [ ( T EIFS + T Backoff ) * P LISTEN + T Data * P TX + T SIFS * P LISTEN + T ack * P RX ] + [ ⁢ ( T AIFS + T Backoff ) * P LISTEN + T Data * P TX + T SIFS * P LISTEN + T ack * P RX ] where: P LISTEN is the consumed power when listening to the medium, P RX is the consumed power when receiving a frame, P TX is the consumed power when transmitting a frame, and, Avg_No_of_attempts is the number of TX attempts expected for a given TX context.