Patent ID: 8547942

Claim:
A transmitter station for a wireless communication able to transmit data to a receiver station with a variable data rate depending on a current radio wave condition; wherein said transmitter station holds a plurality of records including a current data rate, a number of successes at data rates, a number of failures at data rates and a number of waits to transmit data at data rates; wherein said transmitter station compares a first threshold with a first weighted sum of a probability of transaction success at data rates faster than said current data rate and a probability of transaction success at data rates slower than said current data rate, and determines based on said comparison whether said current radio wave condition is weakened by a physical barrier or not; wherein said weighted sum is: 0.9 ×R sh +0.1× R sl , where R sh is said probability of transaction successes at data rates faster than said current data rate, and R sl is said probability of transaction successes at data rates slower than said current data rate; and wherein said transmitter station controls said current data rate, transmission power, a packet size of said transmitted data, and a receiving sensitivity based on said records.