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Hybrid Monitoring Scheme for End-to-End Performance Enhancement of Real-time Media Transport  

Park Ju-Won (광주과학기술원 정보통신공학과 네트워크미디어 연구실)
Kim JongWon (광주과학기술원 정보통신공학과 네트워크미디어 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.10B, 2005 , pp. 630-638 More about this Journal
Abstract
As real-time media applications based on IP multicast networks spread widely, the end-to-end QoS (quality of service) provisioning for these applications have become very important. To guarantee the end-to-end QoS of multi-party media applications, it is essential to monitor the time-varying status of both network metrics (i.e., delay, jitter and loss) and system metrics (i.e., CPU and memory utilization). In this paper, targeting the multicast-enabled AG (Access Grid) group collaboration tool based on multi-Party real-time media services, a hybrid monitoring scheme that can monitor the status of both multicast network and node system is investigated. It combines active monitoring and passive monitoring approaches to measure multicast network. The active monitoring measures network-layer metrics (i.e., network condition) with probe packets while the passive monitoring checks application-layer metrics (i.e., user traffic condition by analyzing RTCP packets). In addition, it measures node system metrics from system API. By comparing these hybrid results, we attempt to pinpoint the causes of performance degradation and explore corresponding reactions to improve the end-to-end performance. The experimental results show that the proposed hybrid monitoring can provide useful information to coordinate the performance improvement of multi-party real-time media applications.
Keywords
Network measurement; IP multicast networks; hybrid monitoring; real-time media; end-to-end performance;
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