Computer Science Journals
The throughput performance of secondary users sharing radio spectrum with a licensed primary user is analyzed in this paper. An asynchronous transmission, sensing and backoff protocol is proposed for the secondary user and modeled as a six state Markov process. The model parameters are derived as a function of the duty cycle and average duration that the channel is unoccupied by the primary user. The secondary user parameters include its continuous transmission duration or packet size and its backoff window size.