| Summary: | 碩士 === 國立中央大學 === 資訊工程研究所 === 94 === Demands for a mobile communication and a high quality service such as video steaming or VoIP have been increasing in recent years. According to these social environments, IEEE 802.16 standard for BWA (Broadband Wireless Access) systems was proposed to supports a metropolitan area network architecture. In IEEE 802.16 MAC protocol, the performance of the system is affected by the size of the contention period, a long contention period would be a waste of transmission space. To reduce this problem, we dynamic change the length of the contention period according to the transmission space. In order to let our dynamic contention period mechanism work more stably. We choose the p-persistence scheme to be our contention mechanism.
Unfortunately, even if the p-persistence scheme is stable enough, BS may receive no requests during a frame and result in the waste of transmission space under short contention period situation. To solve this problem, we propose a smooth p-persistence contention scheme. The experiment results show that our scheme unrolls better performance than original algorithm under dynamic contention period situation.
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