Mathematical Analysis of Improving the System Capacity and Signal to Interference Ratio in Cellular Mobile Communication

Abstract

The most important index for Quality of Service is call drop which has not been accurately discussed before. Sometimes the network disconnects while talking on the phone, this disconnection is called a dropped call. The level of call drop of mobile operators in the every country has increased significantly lately. As a result, thousands of mobile phone users are suffering. To reduce call drop, at first the factors causing call drop have identified in this paper. Based on these factors, dropped call model has developed to find out the parameters associated with call drop. Then some existing techniques have analyzed mathematically to improve the different parameters of these factors to reduce call drop. Three main factors have identified from the developed dropped call model causing call drop such as the lack of available channels, the poor signal quality and the handover failure. In this paper, mathematical analysis of cell splitting, cell sectoring and Microcell zone concept have provided to support extra connecting demand, ongoing service and to improve the signal to interference ratio. Also queuing handoff will be analyzed mathematically with justification to avoid disturbing service call drop. Simulation of mathematical model of these call drop reduction techniques has performed using MATLAB software.