In this paper, a new technique for cross layer design, based on present Eb/N0(bit energy per noise density) ratio of the connections and target values ofthe Quality of Service (QoS) information parameters from MAC layer, is proposedto dynamically select the Modulation and Coding Scheme (MCS) at the PHY layerfor WiMAX Broadband Wireless Access (BWA) networks. The QoS informationparameter includes New Connection Blocking Probability (NCBP), Hand offConnection Dropping Probability (HCDP) and Connection Outage Probability (COP).In addition, a Signal to Interference plus Noise Ratio (SINR) based CallAdmission Control (CAC) algorithm and Queue based Scheduling algorithm areintegrated for the cross layer design. An analytical model using the ContinuousTime Markov Chain (CTMC) is developed for performance evaluation of thealgorithms under various MCS. The effect of Eb/No is observed for QoSinformation parameters in order to determine its optimum range. Simulationresults show that the integrated CAC and packet Scheduling model maximizes thebandwidth utilization and fair allocation of the system resources for all typesof MCS and guarantees the QoS to the connections.
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