Distributed time division multiple access (DTDMA) medium access control protocol for wireless sensor networks
| dc.contributor.author | Woon, Thean Hung Wilson | |
| dc.date.accessioned | 2014-11-11T01:18:18Z | |
| dc.date.available | 2014-11-11T01:18:18Z | |
| dc.date.issued | 2006 | |
| dc.description | Master | en_US |
| dc.description.abstract | Wireless Sensor Networks (WSNs) received tremendous attention over the last few years due to increasing demand for low data rate, low-cost and low power applications in industries like factory automation, military, health and hospitality, environment monitoring, security, search and rescue, and wireless communications. In recent years, there have been intense efforts on developing wireless sensor networking for data communications. Like traditional wireless communications, medium access control (MAC) protocols remain a challenging problem in enabling seamless connection between devices. The basic requirement from a MAC protocol is efficient channel access with minimal packet collision. Within WSNs, sensor nodes are usually battery powered which incur limitations on energy availability. Therefore energy-saving mechanisms are vital to ensure longevity. Other requirements include scalability and adaptivity, distributed cooperation among nodes, low bandwidth, fair channel access, good throughput and channel utilization, and minimal latency. It is challenging to attempt to fulfill all requirements. Therefore, existing MAC protocols usually have one or more tradeoffs. This thesis evaluates the performance of IEEE 802.15.4 wireless networks under various environments using the ns2 simulator and a five-node wireless sensor network testbed. This recently released standard was designed specifically for WSNs but its actual performance has not been studied extensively. This thesis also proposes the Slotted Beaconless Medium Access Control (SB-MAC) protocol as an enhancement to the IEEE 802.15.4 protocol. This protocol is based on a Distributed Time Division Multiple Access (DTDMA) MAC scheme. It consists of three functions: channel access, time slot synchronization and collision-free data communications. This protocol is implemented in the five-node wireless sensor network testbed and evaluated against the IEEE 802.15.4 protocol. It was found that SB-MAC performs better than the IEEE 802.15.4 protocol in various wireless sensor mesh network topologies. | en_US |
| dc.identifier.uri | http://hdl.handle.net/123456789/378 | |
| dc.language.iso | en | en_US |
| dc.subject | Computer Science | en_US |
| dc.subject | Distributed time division multiple access (DTDMA) | en_US |
| dc.subject | Wireless sensor networks | en_US |
| dc.title | Distributed time division multiple access (DTDMA) medium access control protocol for wireless sensor networks | en_US |
| dc.type | Thesis | en_US |
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