An adaptive power saving mechanism in IEEE 802.11 wireless IP networks

Abstract

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 wakeup 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.

Energy Efficient IP-Connectivity with IEEE 802.11 for Home M2M Networks

“…There is a lot of 802.11 PSM related studies, which are aimed at minimizing energy consumption in M2M networks. We can categorize them into two groups: one requiring changes on the AP side [12], [13]; and the other one about strategies on the client side [14], [15], [16], [17]. In this section, the 802.11 PSM related enhancements on the AP side is not analyzed since we consider sleep scheduling strategies on the client side to be applied on top of the conventional WLAN infrastructure in homes.…”

“…Instead of a fixed wake-up interval, [15] proposes traffic-aware duty cycles. Similarly, [16] chooses an adaptive interval time for sleeping depending on the time of the session activity at IP layer.…”

“…Start the mDNS responder with modif iedRdata in homeM 2M.local 15: end if 16: end procedure 50W appliance even though both of them are mains-powered. Additionally, limits for standby electric power consumption of home appliances affect activeness factor parameter (k) and these limits are defined by EU's regulations [27].…”

Native support of idle mode in wireless IP networks

“…Extensive work exists on Microwave Access WLAN-Wireless local area network problem statements, requirements, and solutions, as well as performance evaluations of IP-based paging mechanisms [5,6,9]. However, state-of-the-art solution proposals, like those in [14], typically associate IP-paging solutions with mobility mechanisms like mobile IP.…”

Performance analysis of IP paging protocol in IEEE 802.11 networks

“…However, since wireless networks are unpredictable , it is difficult to determine the exact session arrival pattern and to find out the session blocking probability. Therefore, in a future study, we will propose a new algorithm which can be used to find the optimal adjustment constant for a given delay constraints and which utilizes an estimation scheme to determine the packet arrival pattern [13].…”