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In 3G mobile communication system, mobile broadband data services create great opportunities on revenue growth for network carriers. In the mean time, the dramatically increased subscribers make the access and core network more and more over-loaded everyday. Unfortunately, majority of wireless bandwidth is consumed by non revenue driven application traffic such as the P2P downloading, illegal VoIP and file sharing that launched by minority of subscribers. This phenomenon seriously affects the experience of normal users. From the perspective of network carriers, network performance and user behavior should be monitored to detect mis-conducts and abnormal utilization in real time so as to achieve utilization fairness and efficiency.
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