An Improved Region Division Allocation (IRDA) of Orthogonal Variable Spreading Factor Code in the Forward Link of WCDMA Network

Unrestricted access to the Wideband Code Division Multiple Access (WCDMA) network depends on availability of and unrestricted access to OVSF codes. The limitation of existing OVSF code allocation schemes caused the degradation on overall throughput of the WCDMA network. This paper proposes an improved Region Division Allocation (IRDA) of OVSF codes. According to this IRDA algorithm, User’s would be able to borrow from other code regions and return to their home code regions. The simulation results indicates that optimum and fair usage of the available code is possible