Optimal Access Guarantee in Hybrid Access Femtocells Using Fuzzy Logic System

Abstract

Determining the optimal access guarantee level for hybrid access Femto cells remains an unsolved component of Femto cell development. In this paper, we present a hybrid access scheme that uses Signal-to-interference plus noise ratio (SINR) and channel (time) availability for determining the appropriate access guarantee level. These parameters can be easily obtained by the Femto device’s self-configuration and initialization capability. Fuzzy logic scheme employing the Mamdani system was used for processing due to its simplicity and manageable trade off in accuracy. A Sugeno system was then included in the two stage Fuzzy Inference System to achieve the desired result. In our results, we present an Access Guarantee metric that was used to determine the optimal access region. An Access Guarantee value of about 45.6% was obtained in our simulation specific environment.