A Real Implementation of DPI in 3G Network

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. In this paper, we implement the deep packet inspection (DPI) technology into the CDMA 1x EV DO mobile network packet switch ( PS) domain and construct a DPI based network traffic monitoring, analysis and management system. With the system, subscriber, cell, base station, PCF and PDSN based traffic monitoring and control, and application based traffic management is enabled. As a result, network capacity has been fully utilized by setting the application rate threshold, customer satisfaction has been greatly improved by keeping fair bandwidth utilization.