IEEE 802.11無線區域網路(Wireless Local Area Networks, WLAN)是目前國內通訊領域極具份量的一項產業。Ad-hoc Networks便是熱門的通訊系統其中之一，Ad-hoc網路是由一群可隨意移動之工作站所組成，且不需要經由基地台或是預先設置好的基礎架構(Infrastructure) 即可運作的行動特殊網。在基本的路由機制如AODV、DSR等，他們並沒有提出一個機制去避免網路擁塞。當網路流量變大時，有即時需求的資訊就無法傳送成功，或因延遲時間超過限制而被拋棄。
現今的網路大部分都是著重在即時性的多媒體方面的封包居多，因此如何在有限的網路頻寬裡提供最大的效能，也就是本論文所要探討的重點。本論文的目的即使用AODV的方式，針對QoS機制裡的頻寬預測，藉由QoS的管理機制，提供足夠的頻寬資訊讓網路流量能夠順利通過，進而提高通訊品質、傳輸速率的技術及系統設計。經由AODV加上QoS機制的模擬設計，系統流量被更有效的控制，額外的訊息封包傳送也減少。因此藉由本論文的研究得知，增加了傳送的效率，資料封包的延遲時間也減少許多。

Nowadays, IEEE 802.11 wireless local area networks (WLAN) related product plays an important role in the domestic communication industry. An ad-hoc network is one of the popular communication systems. It operates without a central entity or infrastructure, and is composed of highly mobile hosts. In ad-hoc network, routing protocols are with host mobility and bandwidth constraints. Based on AODV or DSR, they had not proposed a mechanism to avoid the network congestion. It can’t transmit successfully when network traffic becomes large, or Delay time over the prescribed limit had been abandoned.
Today, network is focus on real-time multimedia system. It is an important problem about how to increase the bandwidth utilization and guarantee Quality-of-Service. The purpose of this thesis is to study and develop a way to extend the bandwidth efficiency and improve the system throughput. We use the bandwidth reservation mechanism to support QoS by AODV. In order to provide sufficient bandwidth to allow network traffic information is passed and improving the quality of communication by QoS management mechanism. Simulation results demonstrate that our AODV protocol can more satisfy each connection's QoS requirement and provide higher bandwidth utilization and low packet loss rate.

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