Cellular telephony provides voice and data services to mobile users. T
o deliver these services, the cellular network can track the locations
of the users, and can allow user movement during the conversations. I
t achieves these capabilities through small-scale (handoff) and large-
scale (roaming) mobility management. In this tutorial, the authors des
cribe mobility management in cellular networks, including the details
of different handoff schemes, location-tracking schemes, and call-deli
very procedures.