Patent ID: 7580634

Claim:
A transmission method applied to a system comprising transmission media and a plurality of transmitter-receivers connected via the transmission media, comprising: transmitting information on the output power of a first transmitter-receiver from the first transmitter-receiver to a second transmitter-receiver; measuring reception strength by the second transmitter-receiver when the second transmitter-receiver receives the output power information; reading the output power information by the second transmitter-receiver; and comparing the reception strength with the output power information to calculate a transmission loss or gain by the second transmitter-receiver, wherein at least one of the transmission rate and the output power of the first transmitter/receiver are automatically adjusted according to the calculation of transmission loss or gain by the second transmitter-receiver, wherein the output power for transmitting the output power information is expressed as follows: P 0 ≧P 1×( B 0 /B 1) where B 0 and P 0 are the transmission rate and the output power for transmitting the output power information, respectively, and B 1 and P 1 are the lowest transmission rate and the highest output power selectable for data communication, respectively.