Yunju Park

Bio: Yunju Park is an academic researcher from KAIST. The author has contributed to research in topics: Wireless network & Electrical efficiency. The author has an hindex of 1, co-authored 1 publications receiving 16 citations.

An Efficient Power Saving Mechanism for Delay-Guaranteed Services in IEEE 802.16e

Abstract: As the IEEE 802.16e Wireless Metropolitan Access Network (WMAN) supports the mobility of a mobile station (MS), increasing MS power efficiency has become an important issue. In this paper, we analyze the sleep-mode operation for an efficient power saving mechanism for delay-guaranteed services in the IEEE 802.16e WMAN and observe the effects of the operating parameters related to this operation. For the analysis we use the M/GI/1/K queueing system with multiple vacations, exhaustive services and setup times. In the analysis, we consider the power consumption during the wake-mode period as well as the sleep-mode period. As a performance measure for the power consumption, we propose the power consumption per unit time per effective arrival which considers the power consumption and the packet blocking probability simultaneously. In addition, since we consider delay-guaranteed services, the average packet response delay is also considered as a performance measure. Based on the performance measures, we obtain the optimal sleep-mode operation which minimizes the power consumption per unit time per effective arrival with a given delay requirement. Numerical studies are also provided to investigate the system performance and to show how to achieve our objective.

IEEE Standard for Local and Metropolitan Area Networks Part 16: Air Interface for Fixed Broadband Wireless Access Systems Draft Amendment: Management Information Base Extensions

Abstract: This document provides updates to IEEE Std 802.16's MIB for the MAC, PHY and asso- ciated management procedures in order to accommodate recent extensions to the standard.

IEEE 802.16m energy-efficient sleep mode operation analysis with mean delay restriction

Abstract: IEEE 802.16e standard currently supports mobile subscriber stations, which substantiates the need for energy-efficient communication. In this paper we analyze a novel sleep mode mechanism to be considered for the future IEEE 802.16m standard. We study the overall message delay in the downlink channel and explicitly account for the sleep mode power consumption. Simple expressions are given based on M/D/1 queueing system with multiple vacations. The analytical approach is verified by simulation.

Power Saving Mechanism in IEEE 802.16m

Abstract: Most wireless networks adopt power saving mechanisms in order to extend the battery lifetime of mobile devices. In this paper, we investigate the performance of a power saving mechanism in IEEE 802.16m by using a simulator which models the sleep mode operation with a flexible length of listening window specified in IEEE 802.16m standard. Through simulations, we evaluate the proportion of listening window in a given sleep operation period as a performance measure for power consumption instead of direct estimation of power consumption and measure the power efficiency in various environments. The sleep mode operation in traffic indication messages can reduce the proportion of the listening window by approximately 10% than that without traffic indication messages.

Performance analysis of sleep mode operation in IEEE802.16e

Abstract: The IEEE80216e is a standard of emerging broadband wireless access system which supports the mobilityThe mobile subscribers(MSS) are mainly powered by the batteries,so the sleep mode mechanism becomes an important component for the MSS which can effectively manage the limited energy,and prolong the using time of the once-charged batteriesThis paper introduced the standardized sleep mode in IEEE80216e,then it analyzed the average energy consumption and the average packet delay under sleep mode by building a semi-Markov chain,and gave the simulation results by NS2 at last