Service differentiation for stateless IEEE 802.11 wireless ad hoc networks

[[abstract]]Ad Hoc 無線網路透過媒介存取控制層(MAC Layer)中的分散式協調機制(DCF)可使網路上的工作站能有效運作。然而DCF機制將無法提供服務品質保證(QoS)。為此提供了無狀態Ad Hoc 無線網路(SWAN)去支援差異型的服務，使之能達到服務品質保證。 在本論文中研究分散式協調機制(DCF)和無狀態Ad Hoc 無線網路(SWAN)，透過模擬比較目前的DCF機制與以提出的SWAN機制，可以發現即使在較高負載的網路環境下，SWAN可以有效地減少delay和增加throughput。而模擬中也發現到競爭視窗(contention window)對於網路效能影響甚大。[[abstract]]In Ad Hoc wireless network each station can work well by using Distributed Coordination Function(DCF) mechanism in Medium Access Control(MAC)layer, but the DCF can not support quality-of-service (QoS) . Therefore , this paper proposes the stateless wireless Ad Hoc Network(SWAN) mechanism to support service differentiation. In this way we can achieve the expected QoS when the network operates. We study the distributed coordination function and stateless wireless Ad Hoc Network(SWAN) in this thesis. By comparing the DCF and SWAN mechanisms and with the simulation results, we found that even the traffic load is high, the SWAN can effectively reduce the delay and increase the throughput. We also found from simulation results that contention window (CW) will significantly affect the network performance.[[note]]碩