2 research outputs found
ON THE ACCURACY OF MOBILITY MODELLING IN WIRELESS NETWORKS
In a wireless mobile network, two major
problems arise: poor performance of the wireless layer and effect of
user mobility. The problems related to limited available radio bandwidth and
radio channel errors seem to be solved by CDMA technique applied in 3G
mobile systems. The bandwidth that is provided by CDMA air interface is
enough for present mobile multimedia applications. However such applications
are sensitive to the degradation of QoS parameters. Graceful degradation
could happen when too many mobiles arrive to the same radio cell. To avoid
such situations the Call Admission Control (CAC) has to limit the number of
newly accepted connections. Terminal mobility causes problems in call
admission control because the number of active mobile terminals in a cell is
a random variable. In this paper we introduce a new method to predict the
number of terminals in each cell. Based on this information a more effective
CAC algorithm can be applied in order to ensure user麓s satisfaction