Transmission system and transmission method

A transmission method in a transmission system which includes:

• a first communication apparatus that receives a first wireless signal from a wireless terminal apparatus and transmits a second wireless signal to the wireless terminal apparatus;
• a second communication apparatus that receives a first optical signal from the first communication apparatus and transmits a second optical signal to the first communication apparatus;
• and
• a transfer apparatus that transfers the first optical signal and the second optical signal between the first communication apparatus and the second communication apparatus,
• the transmission method comprising:
• converting, by the first communication apparatus, the first wireless signal which has been received from the wireless terminal apparatus into the first optical signal having a first wavelength corresponding to a first physical feature amount of a first wireless section through which the first wireless signal has been transmitted and converting, by the first communication apparatus, the second optical signal into the second wireless signal to be transmitted to the wireless terminal apparatus through the second wireless section which has a second physical feature amount corresponding to a second wavelength of the second optical signal;
• by the transfer apparatus, (i) receiving the first optical signal and the second optical signal, (ii) transferring the received first optical signal to the second communication apparatus, or another transfer apparatus as a transfer destination depending on the first wavelength of the first optical signal, and (iii) transferring the received second optical signal to the first communication apparatus or the another transfer apparatus depending on the second wavelength of the second optical signal;
• and
• receiving from the first communication apparatus, by the second communication apparatus, the first optical signal transferred by the transfer apparatus and having the first wavelength corresponding to the first wireless section to be processed by the second communication apparatus and transmitting, to the first communication apparatus, the second optical signal to be transferred by the transfer apparatus and having the second wavelength corresponding to the second wireless section to be processed by the second communication apparatus.