Title	Study, Evaluation and Measurement of 802.11e and 802.16e Quality of Service Mechanisms in the Context of a Vertical Handover Case of Real Time Applications
Author	Azeddine KHIAT, Ayoub BAHNASSE, Mohamed EL KHAILI, Jamila BAKKOURY
Citation	Vol. 17  No. 2  pp. 119-130
Keywords	802.16e 802.11e VOIP QoS UGS RTPS DCF PCF HCF Video Conferencing Vertical handover OPNET Modeler.

Title	Improving the QoS of VoIP over WiMAX Networks Using OPNET Modeler
Author	Bassam M. AL-Mahadeen and Ameen Al-Mseden
Citation	Vol. 17  No. 8  pp. 132-142
Keywords	BE, ertPS, nrtPS, QoS, rtPS, UGS, WiMAX, VoIP Codecs.