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Off late, researches have shown that today's best-effort Internet with "One fits all" principle comes to an impasse. Addressed to the different QoS requirements of today's network services, the paper proposes a new network architecture based on network virtualization technology for improving Internet QoS. It divides a "Thick" network into multiple "Thin" virtual networks deploying on the same substrate, each is customized with a special designing goal and runs a customized protocol. Then the traffic with different QoS requirements is classified at the ingress router, and distributed to different virtual networks, which are the most suitable for carrying the special traffic. Also, one can deploy a service on multiple virtual networks, and making them working collaboratively to achieve a better QoS.
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