TCP-friendly rate control for mobile multimedia = 무선망에서 멀티미디어를 위한 TCP-friendly 전송 제어 기법

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The proliferation of smart handhold devices and the development of the various wireless technologies lead the real-time multimedia services on mobile Internet dramatically increasing. One of the current research issues for multimedia services is how to guarantee the service quality that satisfies the user requirement in the variant network condition. Wireless network has more factors that affect the network condition, such as wireless link error and user``s mobility as well as the network congestion, which mostly incur packet losses and service disruption. That``s why we need to clarify what causes packet losses and quality degradation in the multimedia sessions to improve QoS on wireless network properly. In this paper, we consider three factors that cause packet losses in wireless networks: network congestion, user``s mobility, and wireless link error. While the network congestion indicates lack of the network capability, others do not really indicate that. Thus, the conventional congestion control may reduce the transmission rate unnecessarily even though packet losses are just caused by handoff or wireless link error, and there are plenty of network resources. This significantly reduces the availability of network resources. Among of those factors, we focus on the wireless link error and how to discriminate it from the other factors. The existing researches discriminate wireless link error from network congestion by using RTT information or by observing the variation of packet inter-arrival time. However, these mechanisms based on the statistical measurement or estimation at the session ends often misestimate the wireless link error because they ignore the buffer overflow at the intermediate routers and the data compression delay. To eliminate this misestimate, we propose a new scheme to discriminate the wireless link error from the network congestion by measuring link layer signal strength at the mobile devices. Our scheme identifies the network condit...
Kim, Myung-Chulresearcher김명철researcher
한국정보통신대학교 : 공학부,
Issue Date
392516/225023 / 020013947

학위논문(석사) - 한국정보통신대학교 : 공학부, 2005, [ v, 46 p. ]


wireless network; rate control; TCP-Friendly; Multimedia; 손실 구분; 멀티미디어; 무선망; 전송제어; loss differentiation

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School of Engineering-Theses_Master(공학부 석사논문)
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