모바일 네트워크에서 TCP 전송율 향상을 위한
Improvement of TCP Transmission Rate using AT-Snoop Protocol in mobile Network
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초록
유선망을 기반으로 개발된 TCP/IP(Transmission Control Protocol/Internet Protocol)는 유선망의 네트워크 혼 잡을 효율적으로 제어하여 신뢰성있는 데이터 전송과 함께 높은 전송율을 달성할 수 있었다. 그러나 TCP가 높은 BER을 가지는 무선환경에 적용되면 낮은 전송율과 긴 지연시간을 초래하여 심각한 성능저하를 가져온다. 이것은 TCP 송신단이 무선링크상의 에러를 네트워크 혼잡으로 잘못 판단하기 때문이다. 본 논문에서는 Snoop 프로토콜을 기반으로 기지국에 적응 타이머(adaptive timer)를 적용한 새로운 기법을 제안한다. 이 기법은 무선 패킷 손실을 빠 르게 복구하기 위하여 무선링크의 상태에 따라서 기지국의 지역 재전송 타이머를 효과적으로 조정한다. 시뮬레이션을 통하여 제안한 방법이 무선 패킷 손실을 효과적으로 복구하여 TCP 전송율을 향상시킬 수 있음을 확인하였다.
Abstract
TCP which has been developed in wired links achieved both reliable data transmission and high throughput by controlling network congestion efficiently. But in the presence of the high BER of wireless links, TCP suffers a significant degradation in performance in the form of poor throughput and very high delays when used in a wireless environment. This behavior arises due to the fact that errors on wireless links are incorrectly interpreted by TCP at the sender as network congestion. In this paper, based on the Snoop protocol a new enhancement scheme with an adaptive timer at the base station is proposed. This adjusts the local retransmission timer at a base station according to the change of states of a wireless link to recover wireless packet losses fast. Simulation results show that the proposed scheme improves TCP throughput by recovering wireless packet losses effectively.
참고문헌 (20)
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