Mobility-based call admission control schemes for wireless mobile networks

Call admission control (CAC) plays a significant role in providing the desired Quality of Service (QoS) in wireless networks. In this paper, we present some new call admission control schemes: mobility-based call admission schemes and new call bounding schemes, for wireless mobile networks providing services to multiple classes of mobile users ( i.e. pedestrians and vehicular travelers). Since the salient feature of wireless mobile networks is the mobility, an ongoing call in one place may have potential impact on the resource usage in another place in the future, the concept of influence curve is introduced to characterize such influence that an ongoing call exerts on the adjacent cells, according to which the channel reservation can be adjusted dynamically and mobility-based call admission control schemes can be designed. To overcome potential congestion, we also propose a new call bounding scheme which places a direct limitation on the number of new calls admitted to a cell. Four CAC schemes are proposed and analyzed via analytical modeling and simulation study. It is shown that our schemes are more effective in providing QoS than other previously known schemes. Copyright  2001 John Wiley & Sons, Ltd.