A Cell-based Call Admission Control Policy with Time Series Prediction and Throttling Mechanism for Supporting QoS in Wireless Cellular Networks
Liang-Teh Lee, Chen-Feng Wu, Der-Fu Tao, Kang-Yuan Liu · 2006
Due to the scarce wireless spectrum, the decision of call admission becomes an important work when a mobile call requests for bandwidth in cellular networks. A prediction system which can predict most information, such as system utilization and CDP and a CAC scheme which uses the prediction information generated by the proposed predicted system are proposed in this paper. Our proposed prediction system can provide prediction information in advance, whether the repetitive time series pattern of the information exists or not. A simple scheme that requires less resource has been used to generate prediction values, before the repetitive patterns have been found. The proposed CAC scheme is based on the prediction results and the bandwidth consumptions in the adjacent cell for deciding to admit a new call or not. The throttle flag that indicates the usage of current cell is proposed to prevent the newly admitted call request being blocked in the adjacent if handoff needed. In order to simplify the complexity of implementation and avoid computations being extremely riveted on the mobile switch center (MSC), an agent which consists of the prediction module and the CAC algorithm is implemented in each cell, and the statistics of each agent can be gathered and analyzed by the central unit. The simulation results show that the proposed CAC scheme can maintain CDP below a predefined threshold, and the CBP is lower than traditional guard channel policies