The Design Of TD-SCDMA Indoor Coverage

The TD-SCDMA trial network has been completed and put into use. The TD-SCDMA trial network construction has far-reaching significance in China. The indoor coverage system is a very important part of the trial network. The study of the subject has reference value for the future large-scale commercial TD-SCDMA network construction.From the aspects of frequency resource, the meaning of TD-SCDMA for domestic operators and the opportunities for the equipment manufacturers, this paper briefly introduced the importance of the TD-SCDMA in 3G network constructions.The paper has also introduced the key technologies of TD-SCDMA, such as smart antennas, joint detection, synchronous CDMA, relay switch and dynamic channel allocation. As the indoor mobile communication coverage exist the coverage, thecapacity and the quality problems, it is necessary to construct indoor coverage. Indoor distribution system is composed of the signal source and signal distribution system. According to different sources, indoor coverage distribution system can be divided into passive distribution system, active distribution system and fiber optic distribution system. In addition, the paper has simply introduced the planning process of indoor coverage. When develop indoor coverage solution, we need to consider the impact of the balance between the downlink and the uplink, the signal leakage, and the time delay between the downlink and the uplink.This paper has also introduced several scenes of traffic model, the indoor propagation model and the field strength prediction method in the coverage area. In the design of TD-SCDMA indoor distribution system, according to the different scenes, we need choose a suitable signal sourcing. We also need to consider the antenna selection and deployment, signal leakage, and the factors of interference between different systems. According to several possible scenarios the paper discussed the design of TD-SCDMA indoor distribution systems approach. Finally the paper cited a few examples of typical scenes.The trend of the 3G indoor coverage systems is a multi-system comprehensive indoor coverage, the paper analyzed the spurious interference, the mutual-interference and obstruction interference and the requirements of a POI system. Through the analysis, we know that the system can entirely avoid interference, as long as the isolation meets the requirements. This article also introduced the method to meet the isolation requirements which can be used in project.At present, the indoor coverage exist many problems, but the area lack of policy and regulatory so far, there are not any relevant laws and regulations to guide indoor coverage constructions. Finally, the paper explored several possible multi-network integration system and the monitoring programmes of the construction of model.