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The indoor distribution is peculiar to the mobile communication system network is an overlay in the outdoor base station signal can not enter inside the building an indoor signal improvement means, for indoor user groups, for improving building wireless signal environment of the mobile communication a successful program, and has been widely used in mobile communications operators across the country covering network. Indoor distribution system and its basic principle is to use wireless mobile base stations for indoor distribution system that will be emitted by the antenna signal is evenly distributed indoors every occasion, in order to ensure that the indoor signal coverage area has ideal. Not only can improve call quality, and enhance the mobile phone connection rate, the formation of high-quality indoor mobile communication area; same time, improve the indoor distribution system can better triage outdoor macrocell traffic, the traffic capacity of the absorption chamber, expanding network capacity mobile networks, improve overall service levels. With the continuous development of the mobile communication network, indoor distribution is also gradually increase the use of performance, the beginning of the network, mainly to provide a continuation of the voice service for 2G network construction, 3G services have been carried out in the original 2G compatible covering, based on the network and provide 3G services to expand high-speed data, video, and other new business model, which requires indoor overlay network to the next level, to provide better service. This article is the work carried out under this premise, I have for many years engaged in the indoor coverage summary. This paper describes a series of indoor distribution, from the basic concepts of indoor distribution network, composed of the main problem to be solved, using a variety of equipment, mainly engineering mode. 2009 3G license officially issued to the three major carriers, in order better to let the user get full 3G construction quality communication services, indoor distribution compatible construction, upgrading and expanding the scope to improve the throughput capacity , have become the new contents of the building. 3G systems and 2G systems in use band coding techniques, so the 3G indoor coverage of some of the new features. 3G indoor coverage to the coverage, capacity, quality of unified planning, the 3G system should also consider the user's business needs, according to the forecast of the business development of indoor coverage planning. To be able to fully explain the 2G indoor distribution network through the indoor distribution network optimization to improve performance and quality, the new 3G network compatible coverage can also be achieved, the paper also summarizes the cases of some of the project's implementation, as a typical program, discussed and research, network optimization project implementation process. In order to be able to have an outlook on the future of development in indoor distribution forecast the development of new technologies, such as multi-platform, to avoid duplication of indoor distribution system construction investment is a compatible multi-network signal coverage line effective means; digital wireless network to optimize coverage equipment development direction; others such as IP access indoor distribution, the IF transmission of indoor distribution technology, there will be a new development, a new direction for the new application of indoor distribution . With the constant application of these new technologies and products and mature, indoor distribution network optimization will become an indispensable segment of the industry in the communication industry. In future studies, my colleagues and I will continue to put these new technologies work in practice, integration and improvement, and I believe that through our concerted efforts, indoor distribution network optimization will enter a new era.
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