Enhanced Call Admission Control for WiMAX networks

Existing Call Admission Control (CAC) mechanism in IEEE 802.16 Broadband Wireless Access (BWA) standard gives priority for VoIP calls in busy hour. The mechanism analyses the performance of UGS service without considering the arrival of non-UGS services. This leads to lack of fairness since the usage of video streaming is also increasing day by day. However the proposed Enhanced Call Admission Control (ECAC) mechanism analyses the performance of non-UGS services with UGS arrival kept constant, thereby ensuring fairness to some extent. The proposed ECAC is simulated in QualNet Version 5.0.2 simulator. From the result, it is found that the proposed mechanism provides the level at which the bandwidth reservation for VoIP calls can be limited.