Call admission control using dynamic cell virtual traffic in CDMA systems

In traditional cellular systems such as FDMA and TDM A systems, handoff calls are favored more than new calls by reserving a fixed number of channels for their exclusive usage. Thus, calls handed off from one cell to another are given higher priority in an effort to provide more reliable service for the existing calls relative to the new calls. In CDMA systems, the trade off between the cell´s interference level and the cell capacity plays a significant role in call admission process. No matter how many channels may be available per cellular cell, the current cell traffic load affects the principles of admitting new/handoff calls to a cell. In order to maximize the utilization of the CDMA system, we propose a dynamic mechanism for managing the CDMA cell resources to improve the blocking probability without altering the handoff dropping probability. The proposed approach stems from observing the environment surrounding the CDMA cell in question. The system can forecast and manage how much traffic needed to be reserved for handoff calls in the near future. Simulation analysis is conducted and demonstrates the effectiveness of the proposed approach for CDMA systems.