[논문]An Adaptive Power Saving Mechanism in IEEE 802.11 Wireless IP Networks

Pack Sangheon; Choi Yanghee

doi:10.1109/jcn.2005.6387860

An Adaptive Power Saving Mechanism in IEEE 802.11 Wireless IP Networks 원문보기

Journal of communications and networks, v.7 no.2, 2005년, pp.126 - 134

Pack Sangheon (School of Computer Science and Engineering, Seoul National University) , Choi Yanghee (School of Computer Science and Engineering, Seoul National University)

Abstract ▼ AI-Helper

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.

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문제 정의

The detailed operations of two modes are quite different. Since IP paging protocols are deployed in infrastructure networks, this work focuses on the power saving mechanism in infrastructure mode. In infrastructure mode, there is an access point (AP) to monitor current mode of each MH.

가설 설정

Since the model 2 consumes much lower energy in the standby and sleep states, the remaining energy is higher than that of the model 1. In addition, the energy saving gain of the adaptive PSM is not remarkable in the model 2. This is because, in the model 2, the difference between power consumptions of the standby and sleep states is not high. However, the low power consumption models are available only for limited interfaces such as secure digital input/output (SDIO) type.

제안 방법

However, it is required to reduce the computation overhead to allow Bayes' theorem to be implemented in network interface cards. Consequently, we will conduct a comparative study of each estimation scheme.
The proposed estimation scheme uses the previous communication patterns of the MH in order to estimate the idle period length. Let ID\n\t be an initial estimated length of the idle period.

이론/모형

The key scheme to reduce the energy consumption is how to estimate the idle period length. In this study, we used a simple estimation scheme, called exponentially weighted moving average scheme. However, the performance of this scheme is highly dependent on the initial estimated value and the weight value.

참고문헌 (22)

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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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상세보기
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DOI : 10.1109/JCN.2005.6387860 [무료]
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