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http://dx.doi.org/10.3745/KIPSTA.2008.15-A.1.53

Segment-based Cache Replacement Policy in Transcoding Proxy  

Park, Yoo-Hyun (한국전자통신연구원 디지털홈연구단 인터넷서버그룹)
Kim, Hag-Young (한국전자통신연구원 디지털홈연구단 인터넷서버그룹)
Kim, Kyong-Sok (부산대학교 정보컴퓨터공학부)
Publication Information
The KIPS Transactions:PartA / v.15A, no.1, 2008 , pp. 53-60 More about this Journal
Abstract
Streaming media has contributed to a significant amount of today's Internet Traffic. Like traditional web objects, rich media objects can benefit from proxy caching, but caching streaming media is more of challenging than caching simple web objects, because the streaming media have features such as huge size and high bandwidth. And to support various bandwidth requirements for the heterogeneous ubiquitous devices, a transcoding proxy is usually necessary to provide not only adapting multimedia streams to the client by transcoding, but also caching them for later use. The traditional proxy considers only a single version of the objects, whether they are to be cached or not. However the transcoding proxy has to evaluate the aggregate effect from caching multiple versions of the same object to determine an optimal set of cache objects. And recent researches about multimedia caching frequently store initial parts of videos on the proxy to reduce playback latency and archive better performance. Also lots of researches manage the contents with segments for efficient storage management. In this paper, we define the 9-events of transcoding proxy using 4-atomic events. According to these events, the transcoding proxy can define the next actions. Then, we also propose the segment-based caching policy for the transcoding proxy system. The performance results show that the proposing policy have a low delayed start time, high byte-hit ratio and less transcoding data.
Keywords
Transcoding; Proxy Caching; Multimedia Caching; Segment Based Caching;
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