DAI Liang, ZHAI Yi-ming, WANG Gui-ping. Packet scheduling scheme for energy-delay tradeoff in self-powered roadside units[J]. Journal of Traffic and Transportation Engineering, 2020, 20(2): 161-171. doi: 10.19818/j.cnki.1671-1637.2020.02.013
Citation: DAI Liang, ZHAI Yi-ming, WANG Gui-ping. Packet scheduling scheme for energy-delay tradeoff in self-powered roadside units[J]. Journal of Traffic and Transportation Engineering, 2020, 20(2): 161-171. doi: 10.19818/j.cnki.1671-1637.2020.02.013

Packet scheduling scheme for energy-delay tradeoff in self-powered roadside units

doi: 10.19818/j.cnki.1671-1637.2020.02.013
Funds:

National Key Research and Development Program of China 2018YFB1600600

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  • Author Bio:

    DAI Liang(1981-), male, associate professor, PhD, E-mail: ldai@chd.edu.cn

  • Corresponding author: DAI Liang(1981-), male, associate professor, PhD, E-mail: ldai@chd.edu.cn
  • Received Date: 2019-10-31
  • Publish Date: 2020-04-25
  • Considering the randomness of energy harvesting, vehicle arrival and vehicle speed in the process of self-powered roadside units' packet transmission, the packet scheduling system was modeled as a constrained Markov decision model to analyze the average packet transmission delay and energy consumption. The optimization problem of the minimum packet average transmission delay under the constraint of energy queue was analyzed, and packets scheduling scheme for energy-delay tradeoff in self-powered roadside unitswas proposed. The performance of the optimal packet scheduling scheme was analyzed by simulation experiments, and compared with the greedy bundle relaying scheme and Q-learning method. Simulation result shows that the packet scheduling scheme has a dual-threshold structure. The decision variables were determined by the energy queue state of the self-powered roadside units and the speed state of the arriving vehicles, so that the system can reduce the average transmission delay of the monitoring data on the premise of considering the energy utilization efficiency, and ensure non-overflow of the self-powered roadside units' energy storage to minimize the average packet transmission delay. In the single packet transmission model, the average transmission delay of the proposed packet scheduling scheme is 15.7% lower than that of greedy bundle relaying scheme, and 13.5% lower than that of Q-learning method. In the batch packet transmission model, the average transmission delay of the proposed packet scheduling scheme is 20.4% lower than that of greedy forwarding scheme, and 11.5% lower than that of Q-learning method.

     

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