OSSC: a new scheme for code allocation in WCDMA

Future wireless systems will have to support multimedia services such as voice, video and data. Several mechanisms, like multiple access, bandwidth allocation and power control are used for providing these multimedia services. In the 3^rd generation of wireless systems, WCDMA is used for the access method in the FDD mode. Therefore, the capacity of the system is based on the cross correlation among the user´s allocated scrambling codes. In this work, we analyze the WCDMA uplink resource allocation and propose a new method, called one service-one scrambling code (OSSC), that reduces the aggregate number of scrambling codes assigned to users in a cell. We also study the impact of the scrambling code assignment on the call interference and the system capacity. An analytical model is provided in this paper