An adaptive power saving mechanism in IEEE 802.11 wireless IP networks

Sangheon Pack, Yanghee Choi

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)


Reducing energy consumption in mobile hosts (MHs) is one of the most critical issues in wireles/mobile networks. IP paging protocol at network layer and power saving mechanism (PSM) at link layer are two core technologies to reduce the energy consumption of MHs. First, we investigate the energy efficiency of the current IEEE 802.11 power saving mechanism (PSM) when IP paging protocol is deployed over IEEE 802.11 networks. The result reveal that the current IEEE 802.11 PSM with a fixed wake-up interval (i.e., the static PSM) exhibits a degraded performance when it is integrated with IP paging protocol. Therefore, we propose an adaptive power saving mechanism in IEEE 802.11-based wireless IP networks. Unlike the static PSM, the adaptive PSM adjusts the wake-up interval adaptively depending on the session activity at IP layer. Specifically, the MH estimates the idle periods for incoming sessions based on the exponentially weighted moving average (EWMA) scheme and sets its wake-up interval dynamically by considering the estimated idle period and paging delay bound. For performance evaluation, we have conducted comprehensive simulations and compared the total cost and energy consumption, which are incurred in IP paging protocol in conjunction with various power saving mechanisms: The static PSM, the adaptive PSM, and the optimum PSM. Simulation results show that the adaptive PSM provides a closer performance to the optimum PSM than the static PSM.

Original languageEnglish
Pages (from-to)126-134
Number of pages9
JournalJournal of Communications and Networks
Issue number2
Publication statusPublished - 2005 Jun
Externally publishedYes


  • Adaptive power saving mechanism
  • Dynamic wake-up interval
  • IEEE 802.11
  • IP paging protocol
  • Performance evaluation

ASJC Scopus subject areas

  • Information Systems
  • Computer Networks and Communications


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