RESUMEN
ABSTRACT Handover is the key procedure in wireless networks to provide required qual ity of service to the users during mobility Handover. As the current scenario of wireless communication comprises of heterogeneity in architecture, application and radio access technologies concentrating on vertical handover becomes important to provide continuous communication and ubiquitous coverage .This paper provides comprehensive survey of the vertical handover, decision technique and parameter used for making proper handover in horizontal and vertical handover . The recent handover schemes are discussed and classified which varies based on concepts and the adopted schemes. A Fuzzy based decision making algorithm is proposed to made the handover decision more appropriate and to avoid loss of communication and provide better performance.