3rd International ICST Conference on COMmunication System SoftWAre and MiddlewaRE

Research Article

Adaptive Waiting Time Threshold Estimation Algorithm for Power Saving in Sleep Mode of IEEE 802.16e

  • @INPROCEEDINGS{10.1109/COMSWA.2008.4554436,
        author={Khyati Sanghvi and Piyush Kumar Jain and Abhijit Lele and Debabrata Das},
        title={Adaptive Waiting Time Threshold Estimation Algorithm for Power Saving in Sleep Mode of IEEE 802.16e},
        proceedings={3rd International ICST Conference on COMmunication System SoftWAre and MiddlewaRE},
        publisher={IEEE},
        proceedings_a={COMSWARE},
        year={2008},
        month={6},
        keywords={IEEE 802.16e WiMAX Sleep Mode Waiting Time Threshold Power Saving},
        doi={10.1109/COMSWA.2008.4554436}
    }
    
  • Khyati Sanghvi
    Piyush Kumar Jain
    Abhijit Lele
    Debabrata Das
    Year: 2008
    Adaptive Waiting Time Threshold Estimation Algorithm for Power Saving in Sleep Mode of IEEE 802.16e
    COMSWARE
    IEEE
    DOI: 10.1109/COMSWA.2008.4554436
Khyati Sanghvi1,*, Piyush Kumar Jain1,*, Abhijit Lele2,*, Debabrata Das1,*
  • 1: International Institute of Information Technology – Bangalore, Electronic City, Bangalore 560100, India
  • 2: Motorola India Research Labs, Bangalore, India
*Contact email: sanghvi.khyati@iiitb.ac.in, piyush.kumar@iiitb.ac.in, abhijit.lele@motorola.com, jain_ddas@iiitb.ac.in

Abstract

Sleep mode is a key feature introduced in IEEE 802.16e standard, which ensures power-efficient operation of battery operated mobile devices. The 802.16e standard does not define when to take decision to trigger sleep mode. However to the best of our knowledge some published works define waiting time threshold as a time for which Mobile Subscriber Station (MSS) waits before entering into sleep mode, which is constant. In this paper, we propose an algorithm which optimizes waiting time threshold according to traffic arrival pattern (Downlink + Uplink), which leads to significant reduction in energy consumption. We have compared the performance of our algorithm with constant waiting time threshold scheme through simulations for different DL to UL ratios. The results show that our algorithm reduces the power consumption significantly by 47% with little increase in average waiting delay by 11% at arrival rate 0.05 per MSS, which is well accepted within end to end delay for non-real time traffic. Furthermore, the simulation results of the proposed algorithm are within tolerable limit of theoretical analysis discussed in the paper.