Asian Journal of Scientific Research1992-14542077-2076Asian Network for Scientific Information10.3923/ajsr.2013.763.771SivakamiT. ShanmugavelS. 4201364The heterogeneous networks are consist of integration of various access technologies such as WI-FI, WI-MAX, 3G/B3G, cellular networks and other services like ad hoc networks etc. and are expected to provide seamless roaming across the networks. When the MN switch to one network to other networks, the inter-domain handoff (VHO) involves. The requirements for VHO are power conception, bandwidth, user preferences, velocity, network cost and network latency etc. To obtain overall QoS of the heterogeneous networks we need to feed these input to an efficient system based on fuzzy logic theory to choose best networks among various access networks. This study mainly focused on the fuzzy logic algorithms with different aspects to choose best networks and discuss its input factors that taken into consideration for Network Selection Function (NSF). Finally, we evaluated handoff delay performance using NS-2 simulation environment.]]>Lampropoulos, G., N. Passas, L. Merakos and A. Kaloxylos,200573044Bosoanca, I. and A. Vargan,20112011Nkansah-Gyekye, Y and J.I. Agbinya,20072007pp: 37Kassar, M., B. Kervella and G. Pujolle,20083126072620Makaya, C. and S. Pierre,20085712091225Chan, P.M.L., R.E. Sheriff, Y.F. Hu, P. Conforto and C. Tocci,2001394251