碩士 / 國立臺灣海洋大學 / 資訊工程學系 / 99 / How to reduce energy consumption to prolong network lifetime is a critical issue in Underwater Sensor Networks (UWSNs) since sensor nodes have limited energy resource. Applying duty cycle mechanism, i.e., sensor nodes switching to sleep mode for most of the time, is an effective way to conserve energy. Bursty traffic is commonly seen in UWSN; however, we do not find satisfactory solutions to efficiently deliver this type of traffic in a duty-cycled environment. In this paper, we propose several energy-efficient MAC protocols that are suitable for bursty traffic transmissions in a duty-cycled multi-hop UWSN. Specifically, we design single-/multi-channel contention-based/free MAC protocols under the assumptions that each node equips with one modem and is unaware of relative distances/propagation delays to other nodes. Utilizing the proposed dynamic duty cycle, time slot allocation, and it time slot borrowing mechanisms, our
protocols operate correctly and efficiently in multi-hop environments. Simulation results verify that our protocols conserve energy and enhance network performance.
| Identifer | oai:union.ndltd.org:TW/099NTOU5394016 |
| Date | January 2011 |
| Creators | Ming-Wei Lu, 呂明蔚 |
| Contributors | Chih-Min Chao, 趙志民 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 38 |
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