Time-based OVSF Code Allocation Schemes in WCDMA Systems

Abstract

In the third generation mobile communication systems, orthogonal variable spreading factor (OVSF) are used for spreading codes. Efficient allocation of codes for users is an important issue in radio resource management. In this paper, we address the impacts of remaining time factor on OVSF code allocation in WCDMA systems. We also propose two time-based allocation schemes for code assignment and reassignment. Simulation results show that the time-based allocation schemes have better performance on probability of call blocking and codes utilization.