An Energy-Efficient and Receiver-Driven MAC Protocol for Wireless Sensor Networks
Wee Lum Tan
Wing Cheong Lau
OnChing Yue
Chinese Univ. of Hong Kong, Hong Kong;
This paper appears in: Vehicular Technology Conference, 2007. VTC-2007 Fall. 2007 IEEE 66th
Publication Date: Sept. 30 2007-Oct. 3 2007
On page(s): 138-142
Location: Baltimore, MD,
ISSN: 1090-3038
ISBN: 978-1-4244-0263-2
INSPEC Accession Number: 9877894
Digital Object Identifier: 10.1109/VETECF.2007.44
Current Version Published: 2007-10-15
Abstract
This paper proposes an energy-efficient and receiver-driven, TDMA-based MAC protocol (RMAC) for wireless sensor networks. By placing the ownership of the timeslots in the hands of the receiver nodes and letting the receiver nodes assign the timeslots to their neighboring sender nodes, RMAC not only eliminates the need for the sender nodes to explicitly wake-up a receiver node for data transmission, but also eliminates any collision or contention overhead among the sender nodes. Our simulation results show that RMAC outperforms other sender- driven, TDMA-based MAC protocols in terms of the packet latency and power consumption. We also devised a mechanism to enable unused timeslots to be "stolen" by other sender nodes and show that in the case of uniform timeslots assignment among the sender nodes, "timeslots stealing" increases the network capacity by as much as 200%. In addition, we propose a simple timeslots reassignment procedure to allow the receiver nodes to redistribute the timeslots among the sender nodes according to their offered traffic load, and show that it enables the network to efficiently reduce the packet latency in the face of asymmetric, bursty traffic patterns.
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