Study on QoS Guarantee Mechanisms in Next Generation Networks

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1 QoS mapping method among different system levelsWe investigate QoS mapping method among application-level QoS, network-level QoS and end-system-level QoS, considering the fact that deliverable or understandable QoS parameters differ among those system entities. Through experimentation on actual video data and systems, we show relationship among CPU resource (CPU cycles) required to encode/decode video data and network resource (bandwidth) required to transfer coded data in real-time fashion.2 Mechanisms to provide QoS in each system entityWe consider how each system entity, i.e. server, client and network, guarantee QoS to real-time video application. It is shown that employing real-time OS in end-systems and bandwidth reservation-based protocol in networks is effective to provide high-quality and real-time video transfer. We also propose the method on how end-systems communicate with each other to obtain information necessary for the resource allocation.3 QoS guarantees based on integrated resource allocation schemeIn allocating resources to real-time video transfer, we should consider availability of system resources on each entity. We propose the integrated resource allocation scheme which achieves the high-quality video transfer with limited resource while maximizing user's utility, which is represented as relation between benefit obtained through allocated resources and cost paid for them.4 Implementation and evaluation of proposed schemeWe implement and evaluate the integrated resource allocation scheme to allocate both of network and server CPU resources to clients in an integrated manner. We clarify some implementation issues and propose the solutions for them. Through experimentation on video transfer, we show that we can achieve efficient resource allocation in compliance with the system environment and provide high-quality video to users.