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Abstract
WIDEBAND CODE DIVISION MULTIPLE ACCESS WCDMA) IS THE ACCESS TECHNIQUE THAT ISADOPTED IN THE THIRD GENERATION CELLULAR SYSTEMS SUCH AS THE UNIVERERSAL MOBILE TELECOMMUNICATION SYSTEM (UMTS).THE PERFORMANCE OF WCDMA CELLULAR RADIO NETWORKS IS HIGHLY DEPENDENT THE AMOUNT OF INFERENCE IN THE SYSTEM. AS THE NUMBER OF USER IN THE CELL INCREASES, THE INTERFERNCE INCREASES. CONSEQUENTLY , THE CELL RADIUS SHOULD BE REDUCED TO REDUCED TO REDUCE THE OUTAGE PROBABILITY . THIS MEANS THAT THERE IS A TRADE-OFFBETWEEN CAPACITY AND COVERAGE AND ALSO BETWEEN CAPACITY AND THE QUALITY OF SERVICE QOS. AS THE SPECTRUM IS A VERY SCARCE RESOURCE, THE DEVELOPMENT OF RADIO RESOURCE MANAGEMENT (RRM) SCHEMES IS OF GREAT IMPORTANCE TO UTILIZE THE SYSTEM RESOURCES EFFICIENTLY AND ACHIEVE MAXIMUM CAPACITY.