Section Packing Mechanism with Threshold for ULE Encapsulation and its effectiveness in IP over DVB satellite(セッション6-A:計算機ネットワーク)

概要

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As an open standard DVB system provides an affordable mean to use satellite for last one mile connection. MultiProtocol Encapsulation (MPE) is currently the standard to encapsulate IP packet into DVB format. However due to many unnecessary overhead involve in MPE, Ultra Light Encapsulation (ULE) has been proposed as the replacement and currently under standardization process. ULE explicitly defines 2 modes of IP packet encapsulation i.e. padding mode and section packing mode. Section packing mode is significantly more efficient than padding mode. Nevertheless, it has packing delay (PD) drawback that may not preferable for time-sensitive applications. Previously no work has been done to evaluate PD in actual IP traffic pattern and their characteristic. In this paper we propose utilizing both padding and section packing mode simultaneously using section packing threshold setting based on PD limitation to overcome or at least reduce packing delay problems and at the same time maintaining high encapsulation efficiency associated with section packing mode. We do evaluation based on client-server traffic model for the proposed method. We show that our proposal is as efficient as section packing without threshold and over 50% more efficient compare to padding mode in client traffic and over 10% more efficient in server traffic.
2006-03-16