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An Asymmetric and Asynchronous Energy Conservation Protocol for Vehicular Networks
January 2010 (vol. 9 no. 1)
pp. 98-111
Shan-Hung Wu, National Taiwan University, Taipei and Telcordia Technologies, Piscataway
Chung-Min Chen, Telcordia Technologies, Piscataway
Ming-Syan Chen, National Taiwan University, Taipei
Intelligent Transportation Systems (ITS) improve passenger/pedestrian safety and transportation productivity through the use of vehicle-to-vehicle and vehicle-to-roadside wireless communication technologies. Communication protocols in these environments must meet strict delay requirements due to the high moving speed of the vehicles. In this paper, we propose an energy-conservative MAC layer protocol, named DSRC-AA, based on IEEE 802.11 that provides power saving to the ITS communication modules (e.g., On Board Units, portable devices, and Road Side Units) while ensuring the bounded delay. DSRC-AA, a generalization of the Asynchronous Quorum-based Power-Saving (AQPS) protocols, capitalizes on the clustering nature of moving vehicles and assigns different wake-up/sleep schedules to the clusterhead and the members of a cluster. DSRC-AA is able to dynamically adapt the schedules to meet the communication delay requirements at various vehicle moving speed. Simulation results show that DSRC-AA is able to yield more than 44 percent reduction in average energy consumption as compared with the existing AQPS protocols, if to be used in vehicular networks.

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Index Terms:
Dedicated Short Range Communications (DSRC), Intelligent Transportation Systems (ITS), vehicular network, wireless communication, energy conservation, quorum system.
Citation:
Shan-Hung Wu, Chung-Min Chen, Ming-Syan Chen, "An Asymmetric and Asynchronous Energy Conservation Protocol for Vehicular Networks," IEEE Transactions on Mobile Computing, vol. 9, no. 1, pp. 98-111, Jan. 2010, doi:10.1109/TMC.2009.101
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