한국통신학회논문지 B : 네트워크 및 융합 서비스, v.29, no.8A, pp.859-867
ISSN
1226-4717
Publisher
한국통신학회 (KICS)
Language
Korean
Type
Journal Article
Abstract
최선형 서비스를 지항하는 인터넷에서 양질의 미디어 스트리밍을 서비스하기 위해서는 시간에 따라 변하는 네트워크 대역폭에 적응할 수 있는 스트리밍 기법이 필요하다. 본 논문에서는 미디어 패킷들의 중요도에 기반한 적응형 전송 기능을 가진 MPEG-4 스트리밍 시스템을 설계하고 구현한다. 수현 시스템은 기초 스트림 제공자 , 동기 계층, DMIF 계층 등의 기본 MPEG-4 시스템 구성요소들과 네이터 우선순위화에 따른 FEC 제어 기반 적응형 진송 모듈로 구성된다. 구체적으로, 동기 계층 패킷들은 객세 단위에 기반하여 우선순위화되어 전송모듈로 전달되며 신뢰적 전송을 위해 FEC 부호화된다. FEC 조합은 수신측 피드백 정보에 따라 동적으로 조절되며 대역폭 제한에 맞추어 중요도가 떨어지는 패킷들은 페기한다. 에뮬레이션기반 네스트베드에서의 실험 결과는 제안 시스템이 네트위크 대역폭 변동의 영향을 줄이고 스트리밍 서비스의 질을 향상시킬 수 있음을 보여준다.
KSP Keywords
Mpeg-4
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