環形藍芽網路：一個藍芽通訊網路的新拓樸及其繞徑協定; BlueRing: A New Scatternet Topology for Bluetooth and Its Routing protocols

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Title:	環形藍芽網路：一個藍芽通訊網路的新拓樸及其繞徑協定;BlueRing: A New Scatternet Topology for Bluetooth and Its Routing protocols
Authors:	張耿銘;Keng-Ming Chang
Contributors:	資訊工程研究所
Keywords:	行動計算;無線通訊;個人網路;藍芽;ad hoc network;Bluetooth;mobile computing;personal-area network;piconet;scatternet;wireless communication
Date:	2002-06-14
Issue Date:	2009-09-22 11:31:55 (UTC+8)
Publisher:	國立中央大學圖書館
Abstract:	在藍芽通訊網路中，目前只提供了微網路(piconet）間點對點的通訊，而對於大範圍的多重微網路（scatternet）間，資料的繞徑問題（routing problem），規格書中並未詳細定義，留下了讓設計者彈性的選擇。所以，在設計一個這樣的繞徑協定(routing protocol）中，我們的目標首先在於創造一個簡單、有效率的拓樸，再在此拓樸上發展一個理想的繞徑協定。考慮藍芽通訊網路的應用，主要方向可在於個人通訊網路方面，也就是主要的設計理念在於簡單、小範圍內的傳輸。然而在傳統的繞徑協定中，直接引用於藍芽網路上並不適合，因為藍芽網路獨特的基頻(baseband）與媒體存取層（MAC layer）特性，使的我們要重新設計一個適合它的繞徑協定。在這篇論文中，我們提出了一個環形的拓樸，稱為”環形藍芽網路”，類似於IEEE 802. 訊標網路，但也由於藍芽基頻特性，實質上與IEEE 802.5 訊標網路有所不同。在環形藍芽網路中，我們所提出的繞徑協定，支援了單一廣播，透過橋接點(Bridge）在不同微網路間的切換策略，將封包傳遞出去。在此繞徑協定中，網路上的通訊點並不需要維持額外的繞徑表（routing table），這意味著不需要額外的繞徑資訊，傳遞往來於各點之間。我們也發展了一套網路的基本容錯能力，讓整個環形網路能維持通訊。我們相信，在這樣的拓樸下，非常適合應用於個人通訊網路，且在模擬測試中，我們與其他拓樸比較過後，效能上也明顯的較好。 The basic networking unit in Bluetooth is Piconet, and a larger-area Bluetooth network can be formed by multiple piconets,called scatternet. However, the structure of scatternets is not defined in the Bluetooth specification and remains as an open issue at the designers' choice. It is desirable to have simple yet efficient scatternet topologies with good supports of routing protocols, considering that Bluetooths are to be used for personal-area networks with design goals of simplicity and compactness. In the literature, although many routing protocols have been proposed for mobile ad hoc networks, directly applying them poses a problem due to Bluetooth's special baseband and MAC-layer features. In this paper, we propose a new ring topology called BlueRing for scatternet structure. It is similar to the IEEE 802.5 token-ring but differs from it in several aspects due to Bluetooth's special baseband features. A routing protocol is proposed to support unicast on BlueRings, along with a bridging policy to support connections and packet relays between different piconets. Routing on BlueRing is stateless in the sense that no routing information needs to be kept by any host once the ring is formed. A fault-tolerant mechanism is developed to tolerate one Bluetooth leaving and thus breaking the BlueRing to keep the network alive. We believe that this new topology is quite scalable to satisfy the requirement of personal-area networks. Simulations and comparisons against other scatternet structures have been conducted. The results demonstrate that BlueRing outperforms other scatternet structures with higher network throughput and moderate packet delay time.
Appears in Collections:	[Graduate Institute of Computer Science and Information Engineering] Electronic Thesis & Dissertation

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