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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/8542


    Title: 無線行動隨意網路上穩定品質服務路由機制之研究;Study of Stable QoS Routing in Mobile Ad Hoc Wireless Networks
    Authors: 吳佳協;Chia-Hsien Wu
    Contributors: 資訊工程研究所
    Keywords: 服務品質保證;路由;無線行動隨意網路;移動性;穩定性;QoS;routing;ad hoc networks;mobility;stabi
    Date: 2001-07-19
    Issue Date: 2009-09-22 11:29:49 (UTC+8)
    Publisher: 國立中央大學圖書館
    Abstract:   無線行動隨意網路中使用者可任意移動之特性與可快速配置起網路環境之優點,提供人們隨時可以在任何時間地點與其他使用者通訊,且可以輕易地更換網路使用者的位置,及架設臨時的網路,並覆蓋一些很難佈線的地方。然而在無線行動隨意網路中由於使用者具有移動性與缺乏有效之路徑穩定策略,使得系統之傳輸疏通量常因發生路徑失敗而導致效能降低與資源嚴重浪費情形。所以,在設計一路由演算法時,除了需考慮到網路的分佈情形外,找尋一條最穩定的路徑使其資料封包在所尋找之路徑中斷時間內達到最大的傳送疏通量,也是一個非常重要的研究議題。   因此,我們在這篇論文中,依照使用者需求和有效使用有限網路資源的原則,提出於無線行動隨意網路上,找尋一兼具穩定性與服務品質保證之路由機制。此機制的運作原理乃是利用各個節點與其鄰近節點間之訊號強度變化關係,來反映出每個使用者之移動性,且以訊號強度變化速率作為預估鏈結將中斷時間之依據,再由使用者提出之服務品質需求,選出從來源端至目的端一可運作最久且符合使用者服務品質需求之最穩定路徑。   另外,在此論文中,我們修改了此路由機制之部分功能,使其亦可應用於藍芽無線網路環境。最後,針對於提出的路由機制,我們以ns-2模擬出一些數據,藉由模擬結果得知,系統之疏通量不會因網路負載增加與使用者移動速度變化而導致效能嚴重下降,且其網路資源也都有效的被使用。 In today’s information community, individuals are always on the move. The stationary network linked by wires is no longer satisfied human needs. Mobile ad hoc wireless networks holding the characteristics of mobility and rapid deployment supply people with the flexibility to ubiquitously communicate anywhere or form a temporary network by a cellular phone or a portable device. Nevertheless, the throughput is decreasing and resources is consuming because of the lack of effectively and stably routing policies. Supporting a robust and stable route is a significant study of designing a routing scheme in mobile ad hoc wireless networks. In this thesis, in accordance with requirements of different users and effective usage of limited in network resources we propose a stable QoS routing mechanism to determine a guaranteed route in mobile ad hoc wireless networks. The manner we provide uses the variation in intensity of the signal from each node to its adjacent ones for reflecting the mobility of each nodes, the velocity of the signal change to expect that when the link will break off, and the quality of service demanded by subscribers to choose a steady route from the source to the destination. In addition, we also modify our mechanism a little bit to suit to the bluetooth wireless network environment in the thesis. Lastly, it is clear to find that the efficiency does not seriously decrease due to the growth of the overhead and the movement of users via the simulated results exercised by ns-2.
    Appears in Collections:[資訊工程研究所] 博碩士論文

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