Patent ID: 8706153

Claim:
A communication system, comprising: a first communication device for transmitting a first signal and receiving a second signal; and a second communication device for transmitting the second signal and receiving the first signal, wherein the first communication device includes a first transmission power control portion for controlling first transmission power, which is transmission power of the first signal, and a memory for storing information for controlling the first transmission power; the second communication device includes a first condition judging portion for judging, by using a bit error rate, condition of the first signal, which the second communication device receives, to generate first transmission power information and a first generating portion for generating the second signal which includes the first transmission power information; the first transmission power control portion acquires the first transmission power information from the second signal, which is received by the first communication device, and controls the first transmission power based on said first transmission power information; and in a case where communication between the first and second communication devices is temporarily stopped, when the communication is restarted, the first transmission power is controlled based on the information stored in the memory.