In recent years, there has been a rapid increase in cellular network deployment and mobile device market penetration. With vigorous research that promises higher data rates, future wireless networks will likely become an integral part of the global communication infrastructure. Ultimately, wireless users will demand the same reliable service as of today’s wireline telecommunications and data networks. However, there are some unique problems in cellular networks that challenge their service reliability. In addition to problems introduced by fading, user mobility place stringent requirements on network resources. Whenever an active mobile terminal (MT) moves from one cell to another, the call needs to be handed off to the new base station (BS), and network resources must be reallocated. Resource demands could fluctuate abruptly due to the movement of high data rate users. Quality of Service (QoS) degradation or even forced termination may occur when there are insufficient resources to accommodate these handoffs.