碩士 / 世新大學 / 資訊管理學研究所(含碩專班) / 99 / Over 70% of our Earth's surface is covered by water, and the Underwater Sensor Networks (UWSN) can collection ocean information, monitor ocean environment. Since the UWSN can only use sound waves to transmit messages, it has the following features as opposed to the wireless sensor network, which uses radio waves to transmit messages: long propagation delay, lower available bandwidth and multi-path problem. The sink node’s broadcasting and collecting data from sensor nodes are routine works in the sensor networks, but many MAC protocols of sensor networks fail to consider the characteristics of these routine works to design an more efficient MAC protocol.
In this thesis, we propose a cross-layered MAC protocol for UWSN named as Scheduling and Random Access Hybrid (SRH-MAC) protocol. In SRH-MAC channel is divided into several superframes with fixed length. Each superframe contains three periods, broadcast period, routine report period and event report period. During the broadcast and routine report periods, each sensor node broadcasts and gathers data in a predetermined time slot so as to avoid collisions and reduce idle waiting time. The data is received and transmitted from and to a predetermined neighboring source and destination nodes. The predetermined time slot, source, and destination nodes are set according to the broadcasting and gathering trees. During the event report period, the senor node reports the sensed event through the time slots reserved by exchanging RTS/CTS packets.
Simulations have shown that the proposed SRH-MAC protocol performs better than existing protocols in terms of network throughput, broadcasting, and gathering latency.
| Identifer | oai:union.ndltd.org:TW/099SHU05396066 |
| Date | January 2011 |
| Creators | Hsiang-tse Hung, 洪向澤 |
| Contributors | Chih-shun Hsu, 許智舜 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 61 |
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