  The ubiquitous services of wireless communication networks are growing
rapidly by the development of wireless communication technologies. While a user
is roaming from one cell to another cell, an intelligent decision mechanism and
network selection is extremely crucial to maintain the quality of service (QoS)
during handover. Handover decision must be made precisely to avoid any
unnecessary phenomenon like ping-pong, corner effect, call blocking, and call
dropping etc. This work considered service types like voice, video, and data
and their QoS requirements for handover decision using fuzzy logic in
heterogeneous network environment. Service is an important factor for the users
and particular service requires respective QoS. This paper provides all the
cases of handover decisions between macrocell and femtocell networks
considering service type. The proposed system models regarding these handover
decisions using fuzzy logic considering several input parameters e.g. received
signal strength indicator (RSSI), data rate, user's velocity, and interference
level (signal-to-noise plus interference ratio) to make handover from femtocell
to macrocell, macrocell to femtocell or femtocell to femtocell. The performance
of different parameters are shown based on service type are analyzed.
