멀티미디어 서비스를 위한 코덱 기반 무선 스케줄러
Codec-based Wireless Scheduler for Multimedia Services
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초록
본 논문에서는 4G 광대역 무선접속 네트워크에서의 스케줄러들을 조사 및 분석하고 멀티미디어 서비스 제공시 고려사항들을 제시한다. VoIP(Voice over Internet Protocol) 서비스나 영상통화 서비스와 같은 경우 패킷 크기나 패킷생성주기와 같은 트래픽 패턴이 응용계층에 적용된 코덱에 의해서 결정되는 특징이 있다. 이런 이유에 의하여 무선 네트워크에서 응용계층에 적용된 코덱을 기반하여 자원을 할당할 경우 무선 자원을 더욱 효율적으로 사용할 수 있다. 이에 본 논문에서는 자원의 효율성을 향상시키기 위하여 멀티미디어 서비스 코덱 기반 스케줄러를 제안한다. 분석결과에 의하면 제안한 VoIP 스케줄링 방안은 ertPS(extended real-time Polling Service) 보다 최대 지원 가능한 VoIP 사용자 수를 50% 향상시킬 수 있었고 제안한 영상통화 스케줄링 방안은 무선 자원 사용률을 최대 50% 향상시킬 수있음을 확인하였다.
Abstract
This paper investigates scheduling algorithms and presents several considerations for providing multimedia services in 4G broadband wireless access networks. In VoIP and video services, traffic pattern (e.g. packet size and packet generation interval) can be determined by a codec applied in the application layer. For this reason, the resource efficiency can be improved if wireless resource can be allocated by using features of a codec applied in the application layer. Therefore, this paper proposes a codec-based wireless scheduler in order to improve the resource efficiency. Performance analysis results show that the proposed VoIP scheduling scheme can improve the VoIP capacity by 50 % compared to that of ertPS and the proposed video scheduling scheme can increase the resource utilization by 50 % compared to other scheduling schemes.
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