A DYNAMIC CHANNEL ASSIGNMENT STRATEGY USING INFORMATION ON SPEED AND MOVING DIRECTION FOR MICRO-CELLULAR SYSTEMS

The dynamic channel assignment (DCA) strategy proposed here uses infor mation on the mobile station speed and direction of motion to reduce t he number of forced call terminations and channel changes in micro cel lular systems. This SMD (speed and moving direction) strategy is compa red with the main DCA strategies by simulating a one-dimensional servi ce area covering a road on which there are high-speed mobile stations (HSMSs) and low-speed mobile stations (LSMSs). The simulation results show that the SMD strategy has the best performance in terms of forced call termination and channel change. The performance difference betwe en the SMD strategy and the other DCA strategies increase as cell size decreases and as HSMS speed increases. While the SMD strategy does no t yield the best total call blocking rate, its total carried load is t he best when cells are small and HSMS speed is high. Also, the SMD per formance improves when the HSMS offered load is small and the LSMS off ered load is large. Although the SMD strategy requires information on the speed and direction of each mobile station and it increases call b lockings somewhat, it reduces the number of forced call terminations a nd channel changes considerably, which is important in micro cellular systems.