An Improved Region Division Allocation Of Orthogonal Variable Spreading Factor Codes In The Downlink Of WCDMA Network

The third generation 3G technology is built in order to fill the limitations experienced in the 2G which handles only voice signals. 3G mobile communication systems is meant to seamlessly integrate a wide variety of communication services such as high speed data, video and multimedia traffic together with the voice services. Wideband Code Division Multiple Access WCDMA is the access technology employed in the 3G network by UMTS to carter for these services. In this thesis we particularly dwelt on the downlink of the physical layer of the air interface which relates to orthogonal Variable Spreading Factor OVSF code selection or allocation. Since the OVSF code is the characteristic code that gave WCDMA its unique feature of allowing multiple users the ability of using the whole available bandwidth simultaneously with little or less interference, we simulated a code allocation scheme called IMPROVED REGION DIVISION ALLOCATION to manage these limited OVSF codes to enable the mobile system accommodate as many as possible UE user element/mobile nodes MN at the same time, more fairer and without code blocking. We compared our result with already existing idea, RDA.