藍芽網路中具有多環架構與自我繞送特性之聯網形成法

TFIR > Department of Electrical Engineering > program > Item 987654321/137

Please use this identifier to cite or link to this item: http://163.15.40.127/ir/handle/987654321/137

Title:	藍芽網路中具有多環架構與自我繞送特性之聯網形成法 The Scatternet Formation with Multi-Ring Topology and Self-Routing for Bluetooth Networks
Authors:	許良政 Shiu, Liang-Cheng Shiu, L. C. (行政院國家科學委員會) (東方技術學院電機工程系)
Keywords:	藍芽;微網;聯網;繞送;Bluetooth;Piconet;Scatternet;Routing
Date:	2005
Issue Date:	2009-07-22 10:31:17 (UTC+8)
Abstract:	藍芽是一種新興的短距離無線通訊技術，一開始主要是用來取代纜線連接，現在則逐漸用來建立個人無線區域網路(Wireless Personal Area Network, WPAN)。在藍芽最新的 1.2 版核心技術規格中沒有詳細規定聯網形成(scatternet formation)的規則，而一個具有高效率的藍芽聯網拓樸結構，對藍芽是否能成建構出WPAN 具關鍵地位，因此已經有許多不同的聯網架構以及形成法被研究學者們提出來。不同藍芽拓樸形狀的網路各有其特色和優缺點。在此計畫中，我們著重在如何形成一個具有較佳特性的拓樸網路，主要是以環狀的聯網架構為基礎，提出一種新的環狀的聯網架構，不同於單一環狀(BlueRing)，而是多重環狀聯網架構，我們稱之為Multi-Ring Scatternet。這種多重環狀聯網架構是由好幾個環狀所組成，這些環又是由同樣數目的微網(Piconet)所構成的環，環上面和環中間透過Bridge 連接每個Piconet 的Master，而每個Master 還可以連接只屬於此微網的Slave。因此我們可以發現此多重環狀聯網架構相對於單一環狀聯網而言，具有更高的錯誤容忍度、更高的可靠度，而且網路直徑更小，平均最短繞送路徑也跟著縮小。在此計畫中，我們將會說明現有的初步成果：如何建構這樣的多重環狀的聯網形成法、以及一種能自我繞送的機制，並且透過模擬實驗的比較分析來顯露其優於樹狀與單一環狀聯網的效能表現，包括微網數目、平均繞送長度與產能(Throughput)等方面的比較。希望在現有成果的基礎上，藉由此計畫的挹注能發展出分散式的聯網形成法，更進一步加入維持管理機制，建立數學模型，經由機率分析，能更準確評估此網路拓樸在各方面的表現。Bluetooth is low-cost, low-power and short-range wireless communication technology, which operates in the global unlicensed 2.4GHz ISM band. It supports wireless connectivity among cell phones, PDAs, digital cameras, laptop computers, and printers etc. A larger-area Bluetooth network can be formed by interconnecting multiple piconets, called scatternet. How to form a high-performance scatternet is an important issue for Wireless Personal Area Network. However, the structure of scatternets is not defined in the Bluetooth specification v 1.2 and remains as an open issue. Recently many people have paid close attention to do a lot of relevant research about this issue. In this project, we propose new scatternet topology architecture for Bluetooth networks, called multi-ring scatternet. The scatternet formation and packet routing method are presented. The self-routing property of multi-ring scatternet makes its routing method efficient and low overhead. Comparing to the Bluetree scatternet, the proposed scatternet is more reliable and relieves the bottleneck at root nodes. As compared with the BlueRing scatternet, it reduces the network diameter and average routing path. Moreover, by the feature of multiple rings, packets can be transmitted on different rings simultaneously. The simulation results reveal that our multi-ring scatternet topology gains better performance by the three metrics of average routing path length, throughput and number of piconets. Based on the above results, we hope the project will support us to develop the distributed scatternet formation without the coordinator, topology maintenance protocols while Bluetooth devices join or leave the scatternet, and the probability model to evaluate the Bluetooth network topology.
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