Connecting with adhoc network,ultraviolet communication takes advantage of the feature of multihops to overcome the limit of ultraviolet communication distance.To make full use of limited resource of channel,the traditional algorithm of media access control(MAC) layer needs to be improved.A new backoff algorithm is proposed based on the traditional binary exponential backoff(BEB) employed in the MAC,which takes the mechanism of punishing and bonus,according to whether the choice of the backoff timer is rati...