Vertical handoffs as a radio resource management tool

Vertical handoffs occur when a user changes association from one type of wireless access technology to another while maintaining an active session. Much work has been done in ensuring seamless handoffs that also preserve quality of service (QoS). However, network operators can exploit vertical handoffs through dedicated radio resource management (RRM) modules to relieve congestion, balance the load and uphold QoS requirements. Nevertheless, this exploitation requires rigorous study in order to realize its full potential. In this paper, we advocate the use and study of operator motivated vertical handoffs as a powerful RRM tool. We also discuss the different factors involved in the design and operation of an operator motivated vertical handoff module (OMVHM). Through simulation studies, we show the potential of OMVHs in both the single class and the multi-class setting.