Research On The Interference Between TD-LTE And WLAN

With the rapid development of mobile Internet and intelligent terminal, the data flows are growing explosive, and the users demand for mobile broadband is increasing. According to the statistical data of mobile operators, more than 90% of the data flows generated in the interior. Along with the strategy "four networks cooperation" be proposed and the TD-LTE large-scale commercial development, GSM, TD-SCDMA, WLAN and TD-LTE coexisting phenomenon is widespread. Systems will produce all kinds of interference problems in the interior. Indoor coverage will be the focus and difficulty of the construction in the future. According to the mobile statistics analysis of some provinces and cities, WLAN as an effective complement to the GSM and TD networks, is carrying most of the interior flows. Study and analysis on the interference between TD-LTE and WLAN, then put forward the related avoiding measures. It is very important significance to the planning and deployment of TD-LTE in the future.The main work and results are as follows:1) It introduces the basic principle and technical characteristics of TD-LTE and WLAN. According to the coexistence interference problems of indoor multiple systems, introduces the principle and harm of interference, researches the analysis methods of different interference.2) Analysis of the types and patterns of interference may exist between TD-LTE and WLAN. Through the standard deterministic analysis methods, determine the isolation in combining deployment scenarios and the space isolation distance in independent deployment scenarios. Then, combine the mobile company’s current networks and devices from different manufacturers, tested on the two above scenarios. The test results show that the interference of TD-LTE base station on WLAN AP in the independent deployment scenarios is the main interference between TD-LTE and WLAN.3) Comparison of theoretical calculation and field test results, analysis of the causes of interference. Based on the study of various kinds of interference avoidance measures, puts forward the related avoiding measures. Then tested again, prove that the proposed measures are reasonable, effective, and can be implemented. Provide valuable reference for the interference problems generated in the process of TD-LTE and WLAN indoor coverage.