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Optimizing Channel Access in Wireless Local Area Network Environments with a New Backoff Approach
Hao-Ming Liang,Ce-Kuen Shieh,Sherali Zeadally,Naveen K Chilamkurti 보안공학연구지원센터 2009 International Journal of Multimedia and Ubiquitous Vol.4 No.2
Over the past few years, several backoff algorithms such as Exponential Increase Exponential Decrease (EIED) and Adaptive Enhanced Distributed Coordination Function (AEDCF)) have been proposed for wireless local area networks to improve channel access. We propose a new backoff technique that monitors the number of backoff counter pauses experienced and modifies the contention window accordingly. We evaluate and compare the performance of our proposed approach with EIED and AEDCF channel access techniques. Our simulations results, obtained under different network conditions, show improved performance for metrics such as the fairness index and end-to-end delay.
MyEvalvid_RTP: a Evaluation Framework for More Realistic Simulations of Multimedia Transmission
Chia-Yu Yu,Chih-Heng Ke,Reuy-Shin Chen,Ce-Kuen Shieh,Naveen Chilamkurti 보안공학연구지원센터 2008 International Journal of Software Engineering and Vol.2 No.2
Recently, multimedia is a more and more important Internet service. For multimedia, Quality of service (QoS) support is a crucial requirement. To meet these QoS requirements, researchers develop specific multimedia mechanism to enhance the performance of video transmission. When they evaluate the performance of their mechanism, most researchers use simulation tools to evaluate. However, when using these simulation tools, researchers usually acquire network-level performance metrics, such as throughput. They cannot evaluate video and audio delivered quality by comparing the original and distorted video. However, using network-level performance metrics can not evaluate the delivered quality correctly. To address this issue, some esearchers proposed simulation tool-sets. These simulation tool-sets can evaluate the video delivered quality well. However, they cannot evaluate the audio delivered quality. Therefore, we propose a new simulation tool-set called as MyEvalvid_RTP to achieve more realistic simulations in this paper. By MyEvalvid_RTP, researchers can evaluate both the video delivered quality and the audio delivered quality.