The Research And Application Of The 3G-basedwireless VPDN Network Scheming

Traffic signal command system in the modernization and informationization of urban transport plays a more and more important role. Stable running, easy maintenance, low failure rate, easy to management is the pursuit goal of the traffic signal command system. Due to the limitation of time networking technology, the current traffic signal command system adopted by the DPN network has many deficiencies. Therefore, as the content of the bureau of traffic signal command system, the respect such as aging, rate of demand is higher and higher, the existing network, because of the limitation of technology, has been unable to meet the actual demand.With the in-depth development of urbanization, urban traffic is larger and larger, the area covered by a geographical environment is also more complex. Convenience of 3G network networking flexibility to decorate a traffic light system, facilitates the implementation of the network and maintenance. Represented by WCDMA technology of 3G networks are not less than 2 MBPS, descending rate theory.The Optimization and up gradation of the network scheme by fully considering the bureau's information construction development direction, can support the development of long-term goals. VPDN based on 3G network mode, the traffic management bureau all traffic lights at a customer within the private network, users can give oneself to the wireless terminal equipment to assign IP addresses. At the same time, the use of the network mode, the bureau's private network and the Internet is completely isolated, data secrecy good, the bureau's private network from hackers and virus from the Internet, can effectively guarantee the stability of the transmission rate and bandwidth.