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A Cross-Layer Protocol with Hybrid MAC for Wireless Sensor Networks
Wirless Sensor Network
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|摘要:||在無線感測網路 (wireless sensor network) 當中，由於無線感測裝置的能源有限，如何有效率地使用這有限的能源是一個很重要的議題。許多媒介存取控制 (MAC)的協定為了將能源消耗降至最低，反而會促使封包延遲時間 (packet latency) 變長。對於應用在需要傳輸緊急資料的無線感測網路當中來說，使用這些MAC的協定並不合適。在本篇論文當中，我們提出了一個混合式MAC的協定，它能在無線感測網路中同時改善能源消耗以及封包延遲時間的問題。這個混合式的協定利用跨層式(cross-layer)的方法來設計，可以根據AODV的路由資訊動態地在TDMA和CSMA當中切換MAC的行為。在我們的方法當中，由於節點沒參與在任何的資料傳輸當中以及在節點密度高的網路拓樸中引起的碰撞所產生之能源消耗，TDMA可以減少這兩個能源消耗的主因。而當一個節點接收到RREQ的時候，它會立即地切換成CSMA以利接收後續傳來的封包。我們利用了不同的網路節點密度來評估我們方法的效能，結果顯示了我們所提出的方法可以有效地改善在無線感測網路當中能源使用效率以及封包延遲時間的問題。|
Energy efficiency is an important issue for wireless sensor networks (WSNs), due to the limited energy of wireless sensor devices. MAC protocols for WSNs may tolerate higher packet latency in order to minimize energy consumption. WSN using such MAC protocols may not be suitable for the applications which may transmit urgent data packets. In this paper, we present a hybrid MAC protocol to improve both energy consumption and packet latency problems in WSNs simultaneously. The hybrid protocol utilizes a cross-layer approach to dynamically switch the behavior of MAC between TDMA and CSMA according to the routing information of AODV. In our protocol, TDMA can reduce energy consumption for the nodes which are not involved in any data transmission and also collisions under high-density network topologies. When a node receives an RREQ message, it immediately switches to CSMA for receiving subsequent data packets. We evaluate the performance of our MAC protocol with different network density. The simulation results show that our proposed protocol can significantly improve energy efficiency and packet latency in WSNs.
|Appears in Collections:||資訊科學與工程學系所|
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