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題 名 | 在無線網狀網路產出增進之改良MAC協定設計=A Modified MAC Protocol for Throughput Improvement in Wireless Mesh Networks |
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作 者 | 陳偉業; 朱志達; 黃志遠; | 書刊名 | 南臺學報 |
卷 期 | 34:4 2009.12[民98.12] |
頁 次 | 頁63-72 |
分類號 | 448.6 |
關鍵詞 | 無線網狀網路; 多重躍點; 多通道; 控制區間; Wireless mesh network; Multi-hop; Multi-channel; Control interval; |
語 文 | 中文(Chinese) |
中文摘要 | 無線網狀網路能動態地自我組織、自我配置,且網路中的節點能夠自動地在節點之間建立並維護網狀連線, 大幅提高網狀網路的服務範圍。無線網狀網路除了部署敏捷,解決有線網路侷限的優點外,還能提高網路的使 用率並使產出提升。此外,多重躍點和多通道傳輸的技術,可以使在傳送範圍內的終端設備作為中繼點,並且 依照網狀網路的路由機制,來源端經由中繼點可以將資料送達目的端,減少碰撞的情況。IEEE 802.11 的CSMA/CA 機制原始的設計是針對單躍點無線區域網路,並不適用於無線多重躍點網路。當躍點數目增加時,產出將大幅 地降低,因此需修改802.11 的MAC 協定來滿足無線網狀網路的需求。本篇提出一新MAC 協定,稱為CT-APC, 結合功率控制及控制區間(control interval) 機制來增進產出。若網路節點能選擇適當的傳送功率,則多個節點間 能同時傳送資料,不但增加網路的產出,也降低整體的功率消耗。另外,在控制訊息交握完成後新增一段控制 區間,讓節點之間可以同步資料傳送週期,降低資料碰撞以及暴露終端問題。模擬結果顯示所提出方法的產出 優於傳統的IEEE 802.11 協定。 |
英文摘要 | A wireless mesh network(WMN)consists of mesh routers and mesh clients, where mesh routers have minimal mobility and form the backbone of WMN. A WMN is dynamically self-organized and self-configured, which the nodes in the network automatically establish and maintain the mesh connectivity among themselves. Therefore, the service coverage of this type of network is significantly increased. IEEE 802.11 CSMA/CA mechanism is originally designed for single-hop WLAN environment, not for wireless multi-hop networks. The throughput drops significantly as the number of hops in a WMN increases. Therefore, the existing 802.11 MAC protocol should be modified to meet the requirement of WMNs. That is, the modified MAC protocol should have the capability to guarantee the end-to-end delay and throughput for each connection. In this paper, we proposed a new MAC protocol called CT-APC(Concurrent Transmission with Adaptive Power Control)to improve performance. If the nodes can choose the adequate transmission power, concurrent multiple data transmissions can take place, causing the increased throughput of the network and reduced power consumption of the nodes. Besides, after the negotiation phase of control messages we add an extra control interval. The control interval is used to allow multiple sender-receiver pairs to synchronize data transfers. Therefore data collisions and exposed terminal problem can be avoided. The simulation results showed that our proposed scheme can significantly outperform IEEE 802.11 MAC protocol. |
本系統中英文摘要資訊取自各篇刊載內容。