SLA-based QoS Monitor System in Heterogeneous Wireless Networks

• Main Authors: Chien-fen Liao, 廖健棻
• Other Authors: 周立德
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/52259008072523203967

碩士 === 國立中央大學 === 資訊工程研究所 === 95 === When network applications from context turned into multimedia and the coming of Wireless WAN, providing QoS in heterogeneous wireless networks are urgent. The bandwidth of wireless network is less than wired network. Network connection quality is sensitive to weather, distance and shelter interference. The mobility of users could change the connection path or even alter wireless network system. Furthermore, a network connection would not only across one wireless access network, but also it could across many networks which belong to different ISPs. To support end-to-end QoS, the domains which in this path must guarantee a level of service quality. For these reasons, this paper proposes a dynamic SLA-based end-to-end QoS provisioning mechanism according to heterogeneous wireless networks characteristics. In the part of measurement, this system will adjust measurement frequency by the changing of network environment. Use network coding technology to reduce the packets of sharing network status information. In the part of QoS provisioning, when roaming in heterogeneous wireless network and network environment conditions changed, the SLA contract signed with backbone network provider could be dynamically modified according to current network states and time for end-to-end QoS guarantee.