A method and system of transmitting messages include requesting to submit a first request for transmitting a first message and to submit a second request for transmitting a second message until there is no first collision detected between the submitted first and second requests upon receipt of the submitted first and second requests. Before there is no first collision detected between the submitted first and second requests, it is requested to submit a third request for transmitting a third message and to submit a fourth request for transmitting a fourth message. However, requesting to re-submit the third request for transmitting the third message and to re-submit the fourth request for transmitting the fourth message if a second collision is detected between the submitted third and the second requests upon receipt thereof is delayed until there is no first collision detected between the submitted first and second requests.

 
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> Signal addition to a wave division multiplex system

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