Public Transport Authority in order to improve efficiency, reduce the processing time to the scene to deal with problems, because the public security system network using military encryption systems, public telecommunication network through the CDMA and its safety performance and transmission rate can not meet their requirements, and finally decided to adopt our iNET300 wireless Network solution to the problem of vehicle movement data query, to achieve liquidity through a wireless private network traffic management. 1,2 pilot one or two years after the trial run, users are very satisfied. iNET300 work in the 336-344MHz frequency band, transmit power up to 5 watts, with a low frequency, transmit power, diffraction and strong features, and uses frequency hopping spread spectrum technology, with 128-bit data encryption rates of up to 512Kbps, the rate and safety are in line with the transmission of mobile traffic management system requirements.
Traffic Management Bureau to use this wireless network is intended primarily to solve the transport detachment of the patrol car under the wireless Internet applications, set up by a detachment of traffic in each master station, providing 4-5 patrol cars or move under the Vehicle Administration mobile multimedia access, in general, requires coverage of 5 km. General urban traffic detachment 3-8, 3-8 which means that future base stations, base stations can be networked through these, to expand wireless coverage, so that each patrol car or mobile Vehicle Administration Office in the entire network automatically switch to the best links on the main station, to ensure a good transfer rate.
Users build the wireless network are designed mainly to solve the problem of wireless Internet access, and license plate number of the query field office issues, the requirements of the wireless network bandwidth is not very high. Set of 2 from the current pilot to see, within a radius of five kilometers in some of the major junctions, the basic transmission rate can reach 100kbps-200kbps speeds, not only do real-time data query and image transmission, image resolution CIF, frame rate 6-8 frames, the speed of ten kilometers 4,5 velocity, the transmission effect is the same. In the dense streets of buildings, walking through the area, most cases can be continued to ensure the wireless link, to provide data transmission, can be connected to the internal Web site security, access to relevant information and illegal license plate numbers. In large and medium cities of 10 base stations will be able to cover a city, in the municipal unit, 2 base stations can cover. As shown below.
System structure:
