Theoretical Analysis And Simulation Evaluation On Frequency Interference And System Coexistence

Due to the evolution of IMT from 3rd generation to 4th generation, wireless carrier network is in need of more Bandwidth, and much more differentiated QoS supporting in user activity and capabilities, it is then demanded by 3 GPP technology for LTE as a technical realization in 2006, which has become the main direction of 3G evolution and is needed by operators as a transition to 4G. In comparison with network technology that is now used, LTE system has much more diverse in scene set more refinement of wireless resource scheduling, which will bring huge technology challenges in the near future.As a result of the evolution of mobile communication and the rapid development of mobile data services, taking LTE as a representative, mobile communication has an increasingly urgent need of frequency resources. The World Radio Conference (WRC has therefore redistributed 450-470 MHz,698-806 MHz,2500-2690 MHz, 3400-3600 MHz and other spectrum resources for mobile communication services. Thus, regional, national, manufacturers and research institutes have been launched in the candidate band systems of the future application of IMT frequency interference for the purpose of research and system coexistence.In carrying out the work on frequency interference with the system coexistence studies, the theoretical analysis and experimental validation of the analysis are usually used, i.e. first calculate the theoretical analysis through the uncertainties of the coexistence of two systems for qualitative analysis; transform the system interference co-exist scene into rigorous mathematical model through simulation platform, establish the system simulation model in cooperation with simulation tools and then analyse the results statistically.By the contrast, operators and system coexistence interference in the frequency of research work are carried out later. In ITU-R WP 5D, CCSA TC5 WG8 and other international standards organizations, the system co-existence simulation results are also mainly from manufacturer and research centers. Taking into account of the different simulation platform simulation results obtained, or even under the same simulation platform, different simulation scenarios, or different simulation parameters also makes the simulation results vary from one another. The demand for comprehensive control and rights to speak of their applications for frequency resources, the Chinese operators are also active in terms of frequency interference and system coexistence, especially in the construction work related to simulationThis article is based on the above background, represented a detailed discussion of the key research in terms of frequency interference and system coexistence, of which the domestic operators are carried out, and a analysis of uncertainties involved in the study of computation and coexistence of the static simulation of interference for a more comprehensive research. The main research work is as following:1) A detailed study of 3 GPP and the ITU relevant norms and recommendations, closely followed the ITU-R WP 5D and CCSA TC5 WG8 and the related usage of frequency resources at home and abroad, from standards organizations and the research results. Based on this, summarizing and combing the coexistence between system research methodologies:i.e. an enhancement of research and summary of the relevant basic concepts, basic principles, basic analytical methods, and the results of the detailed calculation steps.2) With the demand of applications of operator's network in use, and with the research methods of system coexistence, it analyses more comprehensively in TD-SCDMA and WCDMA, TD-SCDMA and PHS frequency interference and system coexistence situation, then gives a conclusion and recommendation of practical value.3) Initially built a simulation platform of system coexistence and frequency interference:i.e. a more comprehensive analysis of the perspective of operators, the preliminary design of the static simulation platform, the key point of simulation and simulation model, combining with the special needs of operators, made unique insights for the simulation of the interference of the terminal base station (BS), BS to BS interference and interference from mobile station (MS) to MS and other design of the key processes4) Focused on LTE interference coexistence scenarios within the system, studied the interference scenario between LTE FDD and LTE TDD Downlink, determined the simulation modeling method, and carried out the actual simulation work, then obtained the simulation results in comparison with 3GPP TR 36.942 specification, and analysed in detail of the simulation results.