An adaptive approach to manage traffic in CDMA ATM networks

Abstract

Wireless Asynchronous Transfer Mode ( WATM) systems are becoming an important field in recent days due to their increasing use and applications. A WATM system is the result of synergy between wireless networks and asynchronous transfer mode ( ATM) technologies. Designing an efficient mobile communication system is considered as a challenging task, given its complexity and operation environments. A major task activity related to these systems addresses the call admission control and resource management. In this paper, we consider these issues in wireless ATM networks integrating the Code Division Multiple Access ( CDMA) technology. An approach for a dynamic resource management is proposed using heterogeneous traffic descriptors as well as the concept of signal-to-interference rate, computed at the base station receivers. An adaptive monitoring scheme that is based on an estimation algorithm and driven by a measurement of the signal-to-interference and predicted traffic parameters of the admitted connections is established. The Dynamic control that we propose at the user network interface, UNI, provides information about the instantaneous bit rate of a source allowing more effective flow control and achieves a good match in terms of predicting the congestion of any switch. It is able to police implicit resource management, which is used for both Constant Bit Rate ( CBR) and Variable Bit Rate ( VBR) traffics as well as explicit resource management that is used for Available Bit Rate ( ABR) traffic.