在具備集中式協調功能的無線網路中以多頻同步傳輸提昇效能之通訊協定

在本篇研究中，我們提出一個在具備集中式協調功能的無線網路上，利用多個頻道同步傳輸來提昇整個網路總流量的通訊協定。這個通訊協定主要用於改善在”Synchronization of multiple access points in the IEEE 802.11 Point coordination Function”[20] 中「需要先有傳輸範圍資訊」以及「頻寬利用率不夠大」的問題。因此我們提出一個在具備集中式協調功能的無線網路上，利用多個頻道同步傳輸來提昇整個網路總流量的通訊協定。這個協定利用兩次的資訊收集，來解決上述論文仍可能發生碰撞的問題。同時經由在同一時間中，讓更多的節點同時傳輸，來提供整體網路更大的傳輸量。綜合我們提出的通協定，具有下列特點：(1)不用預知地理資訊。(2)無隱藏點問題。(3)節省等待時間。(4)避免碰撞。

關鍵字

集中式協調功能；無線網路；同步傳輸；隱藏點；碰撞

並列摘要

In this research, we proposed “Synchronization of Multi-Channel MAC Protocol” based on IEEE 802.11 point coordination function environment. It improve throughput in ”Synchronization of multiple access points in the IEEE 802.11 Point coordination Function”[20]. We propose a new Synchronization of Multi-Channel MAC Protocol. The new protocol used twice information collection, this can help us to solve the collision problem. Also, use the same collection information, more nodes can transmit data at the same time. Therefore, we can improve the total throughput of the wireless network. After all, our protocol may have advantage listed bellow: (1) Works without GPS. (2)It may solve hidden terminal problem. (3)It may saving average node waiting transmit time. (4) It may avoid collision.

並列關鍵字

PCF ； IEEE 802.11 ； synchronization ； hidden terminal ； collision

參考文獻

[1] Andersen, L.D., Mendelsohn, E., “A direct construction for Latin squares without proper subsquares.”, Ann Discrete Math, 15, pp. 27-53., 1982.

[2] Bianchi G.., “Performance analysis of the IEEE 802.11 distributed coordination function”, IEEE Journal on Selected Areas in Communications 18 (3), pp. 535-547.

[3] Baiocchi, A., Todini, A., Valletta, A., “Why a multichannel protocol can boost IEEE 802.11 performance.”, ACM MSWiM, 2004.

[4] Crow, B.P., Widjaja, I., Kim, J.G., Sakai, P., “Investigation of the IEEE 802.11 medium access control (MAC) sublayer functions”, IEEE INFOCOM, Volume 1, 1997, Pages 126-133.

[5] Deepanshu Shukla, Leena Chabdran-Wadia and Sidhar Iyer, “Mitigating the Exposed Node Problem in IEEE 802.11 Ad Hoc Networks.”, Proc. IEEE ICCCN’03, Oct 2003.`

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在具備集中式協調功能的無線網路中以多頻同步傳輸提昇效能之通訊協定

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