Vol-3 Issue-2 2017 IJARIIE-ISSN(O)-2395-4396 4476 www.ijariie.com 2447 A Fuzzy logic based Implementation of Intelligent Network Selection of Wireless 4G Network Jui Bhatia 1 , Ekta Vasani 2 1 PG student, Electronics and communication engineering, SAL institute of technology and engineering research, Gujarat, India 2 Asst. professor, Electronics and communication engineering, SAL institute of technology and engineering research, Gujarat, India ABSTRACT Next generation wireless network are expected to improve multiple radio access technologies in terms of service and application requirements. In a 4g system, performance of soft conventional handoff can be improved by adopting soft handoff thresholds using fuzzy inference systems. To maintain continuous services, a fuzzy multi attribute decision making access network selection is used to select suitable network. The algorithm considers the factors like no of base stations, no of channel remaining and Eb/Io (signal to interference ratio) compared to 3G and IS-95 soft handoff algorithms to show that the proposed fuzzy inference system gives lower blocking probability, outage probability and better Eb/Io. Keyword: - Network selection, 4G, Fuzzy Logic etc 1. INTRODUCTION Handoff is an essential feature for maintaining quality-of service (QoS) for mobile communication system systems. It guarantees the continuity of services when a mobile station (MS) moves across the cellular boundaries. Third generation of mobile cellular networks, which are predominantly based on CDMA technology, used soft handoff (SHO). With soft handoff a conditional decision is made on whether to handoff or not compared to hard handoff (HHO) where a definite decision is made. In soft handoff users have simultaneous traffic channel communication with all candidate base stations in the interim period.[1] 2. METHODOLOGY OF INTELLIGENT NETWORK SELECTION Intelligent network selection for soft handoff with adaptive threshold is done with the help of fuzzy inference system which gives lower blocking probability, outage probability and better Eb/Io compared to other algorithms. Fuzzy logic is basically many valued logic in which the truth values of variables may be any real number between 0 and 1 which are considered to be fuzzy, where 0 and 1 are the crisp values. In this, fuzzification, fuzzy inference and defuzzyfication are the three sub procedures in fuzzy logic based soft handoff algorithm. Proposed fuzzy logic based soft handoff algorithm has three inputs and one output. Three inputs are the expectation of number of based stations in the active set (noBS), number of remaining channels in the base station (CHrm and Etfl. T_Down is the output of the algorithm.