Research On Application Of 350 MW Cluster Distributed Communication System Engineering

Police-used350MHz trunking system has been an important component of police commandcommunication in various security, emergency rescue, disaster relief and daily police affairs.Because of its swift and flexibility compared with any other public mobile system, it is widelyapplied and developed in the public security system throughout the country as a more practicalcommunication means of front-line police. However, public security wireless communicationneeds improvement to adapt to various rapid developing information and communicationtechnologies and rapid reaction mechanism of public security affairs. Traditional trunking systemsgradually reveal defect such as coverage of big and medium city, roaming over the network ofmobile equipment, communication guarantee of major security events, instability of link routing,low efficiency in the use of frequency and reliability of emergency communication net. Abovetechnical difficulty not only constrains the development of public security wireless communication,but also constrains the further application of trunking system. So this subject probes a new conceptpolice-used trunking distributed system.Police-used trunking distributed system is one kind of new generation trunking system based onthe MPT1327air interface technology. System equipment of extensive coverage andmulti-channel base station is configured to match the distributed conditions of service district anduser density. A large distributed system that sub base stations run under the command of centralmain base station is built up to achieve the most effective coverage with the least resource and thesimplest structure. It not only meets the practical requirement of present public security wirelesscommunication, ensures the stability and smooth of communication in significant securityactivities, enhances the wide-area coverage capacity, reduces the construction and maintenancecost, but also leads requirement of wireless communication technology into a new professionallever. In other words, trunking distributed system was born in the settlement process of traditionalsystems defect. It presents an entirely new understanding of network structure, technicalcharacteristics, equipment capabilities, channel configuration, running environment andapplication in accordance with practical requirement of public security affairs, based on MPT1327standard signaling. Trunking distributed system not only expands function of traditional systems,but also greatly improves the sharing use efficiency of frequency by dynamically allocatingfrequency in vertical and horizontal direction among several base stations, that the limitedfrequency resource meeting multi-police species, wide area and wall-to-wall coverage ofelectromagnetic signal become possible.Engineering practice has proved that, compared with traditional systems, police-used trunkingdistributed system improves the efficiency in expansion of coverage, frequency resource,communication of security, roaming over the network, stability of link routing, maintenance ofemergency management and efficient dispatch. As the continuous expansion of trunkingdistributed system function and enrichment of engineering application experience, constructingstyle of trunking distributed system will much widely applied.