Energy-Efficient Mac Protocol Design for Underwater Sensor Networks

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Project title

Code/計畫編號

NSC100-2221-E019-036-MY2

Translated Name/計畫中文名

水下無線感測網路省電媒體存取控制協定設計

Project Coordinator/計畫主持人

Chih-Min Chao

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Computer Science and Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=2333555

Year

2011

Start date/計畫起

01-08-2011

Expected Completion/計畫迄

31-07-2012

Bugetid/研究經費

409千元

ResearchField/研究領域

資訊工程--硬體工程

水下感測節點一般都採用電池供電，在不易充電及回收的情形下，感測節點如何省電以增加運作時間是相當重要的研究議題。傳輸碰撞是造成感測節點電力浪費的重要原因，與傳統無線感測網路(Wireless Sensor Network, WSN)相較，水下感測網路(UnderWater Sensor Network, UWSN)的特性包含傳送速率低、延遲時間長、傳送電力消耗高等，這些因素會使傳輸碰撞更容易發生，因此電力浪費的問題也更嚴重。現存的水下感測網路的省電媒體存取控制協定，多半是處理較簡單網路(如Single Hop、已知延遲時間或流量較小)的碰撞問題，這些方法在處理Multi-Hop、流量較大或節點較多的網路時，效果並不理想。在本計畫的第一年，我們希望利用Quorum System的概念，結合使用多頻道(Multichannel)的優點，在每個感測節點是定期回報資訊的水下Multi-Hop感測網路中，設計出能降低傳輸碰撞的協定，達到省電的目的。本計畫第一年所設計的協定，運作於一個定期回報資訊的水下感測網路，應可有很好的效能。但若感測節點需回傳的資料量是爆發式(Bursty Traffic)，第一年所設計的協定可能就需要再修正。在我們所知的文獻中，並沒有看到針對感測點的資訊量是爆發式的環境所設計的省電媒體存取控制協定，因此，在本計畫第二年中，我們將先比較在資訊量是爆發式的情況下，各種可行的省電存取策略之優劣。根據這個比較結果，再利用我們設計的額外運作時間(Additional Duty Cycle)及時槽偷用(Time Slot Stealing)等機制，發展適用於時變資訊量網路的省電媒體存取協定。本計畫所設計的省電協定，都將透過模擬程式，驗證其在水下Multi-Hop網路環境的可行性及省電效能 Underwater sensor nodes are typically battery powered and usually not easy to recharge and thus, how to use energy efficiently is a critical issue. Transmission collision is an important source of energy waste. Compared with traditional terrestrial radio transmissions in Wireless Sensor Networks (WSNs), the features of transmission in Underwater Sensor Networks (UWSNs) include low data rate, long propagation delay, and higher power consumption. In such a circumstance, the negative effects of transmission collisions problem deteriorate. Most of the existing UWSN MAC protocols handle the collision problem in a single hop or light-loaded environment. They fail to function effectively in a multi-hop network consisting of more heavily loaded sensor nodes. In the first year of this project, we will use concept of quorum system and utilize multiple channels to design a MAC protocol to reduce transmission collision for an UWSN where sensor nodes report their data periodically. The protocol designed in the first year should perform well in a network with periodical reporting. However, in an UWSN where each node’s traffic is bursty (varied over time), it is expected that there remains rooms to improve. To the best of our knowledge, there is no underwater energy-efficient MAC protocol that is designed for such a bursty traffic environment. In the second year of this project, we first compare the pros and cons and the feasibility of different energy-efficient MAC strategies. Based on this comparison, we then utilize mechanisms such as additional duty cycle and time slot stealing to develop energy-efficient MAC protocols that are suitable for an UWSN with bursty traffic. We will also implement simulators to evaluate the correctness and performance of the proposed UWSN energy-efficient protocols we developed in this project.

Keyword(s)

水下感測網路
多頻道
媒體存取控制協定
Underwater Sensor Networks
Multichannel
MAC Protocols

DSpace CRIS

Energy-Efficient Mac Protocol Design for Underwater Sensor Networks

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