| US 7,580,634 B2 | ||
| Transmission method, transmitter-receiver, and transmitting-receiving system | ||
| Takeshi Takeuchi, Tokyo (Japan); Akio Tajima, Tokyo (Japan); Shigekazu Harada, Tokyo (Japan); Akihiro Tanaka, Tokyo (Japan); and Wakako Maeda, Tokyo (Japan) | ||
| Assigned to NEC Corporation, Tokyo (Japan) | ||
| Filed on Oct. 25, 2004, as Appl. No. 10/971,047. | ||
| Claims priority of application No. 2003-367880 (JP), filed on Oct. 28, 2003. | ||
| Prior Publication US 2005/0111843 A1, May 26, 2005 | ||
| Int. Cl. H04B 10/08 (2006.01) | ||
| U.S. Cl. 398—38 [398/15; 398/162] | 65 Claims |
| 1. 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:
P0≧P1×(B0/B1)
where B0 and P0 are the transmission rate and the output power for transmitting the output power information, respectively, and B1 and P1 are the lowest transmission rate and the highest output power selectable for data communication, respectively.
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