Research On Coexistence Interference Between TD-SCDMA And TD-LTE

Interference is always an important aspect in the field of mobile communication system, and is also an important factor in the quality of mobile communication system. Its essence is that the signal which is not stipulated by frequency allocation occupies the frequency of legitimate signal, which will bring the interference problems between difference systems. With the rapid development of computer and communication technology, the coexistence between various communication systems will exist for a long time.As the third generation mobile communication system by China Mobile operator, TD-SCDMA network construction in china is constantly advancing, while TD-LTE is the natural evolution path of TD-SCDMA under the joint effort in chinese government and China Mobile as well as industrial community, TD-LTE will have a broad prospect. So it is meaningful for us to research the coexistence interference between TD-SCDMA and TD-LTE.The coexistence interference between TD-SCDMA and TD-LTE is studied in this paper based on specific calculation and monte carlo simulation method. After explaining the specific calculation, the paper analyzes the interference between TD-SCDMA and TD-LTE base station, and then the numerical calculation is performed based on the characteristics and parameters from 3GPP protocol in order to determine the isolation level that all kinds of interference would be avoided. By adopting the specific calculation, the TD-SCDMA capacity estimation and assessment when interfered by other system is carried out. Based on monte carlo simulation method, the TD-SCDMA and TD-LTE coexistence interference problem in macrocell network environment is then studied in detail. The simulation results show that the throughput or capacity loss which is affected by different location offsets and different sector antennas when ACIR changed. And these conclutions can provide some valueable reference for network planning, hybrid networking and network optimizing between TD-SCDMA and TD-LTE.