| Summary: | 碩士 === 國立暨南國際大學 === 通訊工程研究所 === 98 === Owing to computer technologies development, there are many multimedia services and applications appearing via Internet. How to provide higher speed and lower waiting time Internet service for end users is an important research issue. Traditionally, network layer scheme of IP multicast can decrease transmission delay and increase bandwidth utilization. Due to network management issue and scalability problem, these have hampered the widespread deployment of IP multicast in the global Internet. So the Application Layer Multicast (ALM) approaches operate through the overlay network and recently proposed as a viable alternative solution to IP multicast. Considering transmission performance, ALM approach should construct an application layer topology as close to network layer topology for multiple user data transmission. We apply the previous scheme of DNS-aided ALM which builds overlay network with the help of the existing Domain Name Service (DNS). Furthermore, the wireless network also popularizes in the Internet, the mobile users might make some new problems in ALM topology (e.g. ALM tree or mesh isolation). So we try to modify the establishment rule of
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DNS-aided ALM hierarchy overlay network and propose the Supply Cache and Spiral Link mechanisms for mobility supporting in ALM environment. The simulation study shows that the proposed mechanisms have better performance in contrast scheme.
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