| In recent years,with the popularization of the mobile Internet and Internet of Things technologies,the proportion of data services is increasing in mobile communication services.In the scenario where data services occur,most needs of data occur indoors.Therefore,people have put forward higher requirements for indoor mobile phone signal coverage.There are many high-rise buildings in the city,which have a blocking effect on the base station signal.The signal cannot effectively cover the indoor.In order to meet the seamless coverage of the network and enhance the market competitiveness,operators have begun to vigorously deploy indoor distribution systems.The indoor distribution system is the most important part of achieving seamless coverage.It can minimize the problem of signal blind spots in the room,promote the indoor signal coverage,increase the indoor network capacity and promote the service level,and make users enable to enjoy high-quality communication services indoors.A good distribution system can bear the business volume of the coverage area.In different scenarios,such as passenger stations,large shopping malls,universities,and high-end office buildings,it is important to choose the appropriate indoor distribution system design method.the deployment of indoor distribution systems of C-China Unicom is far from meeting the needs of users' indoor Internet access.The second-generation mobile communication(2G)and third-generation mobile communication(3G)have many indoor distribution systems.Under the background of 2G gradually withdrawing from the network and 4G comprehensive construction,it is imperative to construct a 4G indoor distribution system.The construction of 3G and 4G combined distribution system not only saves construction costs but also facilitates post-maintenance.It is the best choice at this stage.Based on the current situation of the indoor distribution system of C City China Unicom,combined with the actual project,this paper has carried out in-depth research on the design and optimization of the indoor distribution system of Long Term Evolution/Wideband Code Division Multiple Access(LTE/WCDMA).Firstly,the WCDMA and LTE systems and their key technologies are introduced.Then the concept,composition and classification of the indoor distribution system are described.The advantages and disadvantages of various indoor distribution systems are compared and analyzed,and the flexible application in practice is prepared.Furthermore,according to the operator's requirements for indoor distribution system design,the general principles of LTE/WCDMA indoor distribution system design are given,and the priority of signal source selection during design is analyzed.The LTE/WCDMA integration design and problems encountered are explained.Finally,taking the indoor distribution system of a university in C city as an example,the design and construction of LTE/WCDMA indoor distribution system is analyzed.According to the technical requirements of operators,through the on-site site survey and testing of the network environment of colleges and universities,the final design scheme of LTE/WCDMA indoor distribution system is proposed.Through the actual construction acceptance test,the above planning process plan selection was verified from the aspects of technical indicators,leakage and handover analysis,mutual interference between signals,signal strength,and dwell ratio.A solution to the network optimization problem encountered after the construction of the project.This thesis realizes the design and construction of LTE/WCDMA indoor distribution system in C city universities through the combination of theory and practice,and achieves the expected goal.It has certain universality for the construction of indoor distribution system of large buildings. |
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