| With the development of communication technology and the popularization of mobile phone,mobile communication becomes an important part of China’s modern urban rail transit system.Metro area is important to the urban mobility and activity places,its civilian communications system,on the one hand,to undertake a large number of daily civilian communication needs,meet the subway users daily communication experience,improve the city image;On The other hand,can be as the important supplement of the subway emergency communication system,in the event of an emergency,share the communication needs of metro emergency system.Now part of the urban subway public communications are still signal blind area,crowded,fluidity big,have a variety of mobile communication needs,and the equipment installation space is limited,can’t install multiple sets of wireless access to distribution system at the same time,this causes the formation of multi-network fusion access system.In this paper,the author researches the underground wireless public network covering technology.First elaborated the development of the subway network covering technology;Then,review the subway and tunnel network technology now,including the subway and tunnel covers the general principles,general frequency planning principles,and elaborated the subway and tunnel overlay network system function and business coverage and quality requirements,a preliminary analysis of the network extension ability.In accordance with the relevant technical requirements,the author made the planning scheme of metro wireless public network coverage,In particular to interference analysis,switching analysis,passive components and day feed design analysis,and made practical solutions.This paper study on metro wireless public network coverage system and make the solution of coverage problem.The plan will strongly improve network performance,reduce blind spots,solving the problem of network coverage caused by urbanization and improve users’ perception. |
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