| Summary: | 碩士 === 東海大學 === 資訊工程與科學系 === 96 === In IEEE 802.11 Medium Access Control (MAC) protocol has been the standard for the Wireless Local Area Networks (WLAN) and Mobile Ad Hoc Networks (MANET). However, the hidden receiver problem is the primary concern in wireless ad hoc networks, due to the high rates of neglecting the state of the hidden terminal; the potential sender (neighbors of the hidden terminal) enters into an unnecessary backoff process and retransmission circle, therefore leading to serious unfairness between contention terminals.
Hidden receiver problem increases the probability of collision and interference, hence, degrading the performance of network throughput significantly. In this thesis, we review the related problems in wireless environments and proposed two improved schemes with an additional procedure which can be adapted to IEEE 802.11 Distributed Coordination Function (DCF) and Explicit Blocking Notification (EBN) schemes.
Our simulation results have shown that our proposed schemes not only achieve better fairness between competing traffics, reducing the probability of collisions and decreasing the contention on medium access but also greatly improve system throughput and the Quality of Service (Qos) of networks.
|
|---|
