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

摘要

Wireless networking technologies, do not cease to develop and impose day after day. Unlike wired networks, these technologies offer much more mobility, a wide coverage and speed deployment. However, they represent several limits, especially in terms of quality of service (QoS). We hear these days by heterogeneous networks, these latter, and thanks to the handover mechanisms, can ensure a routing data without a break even in the customers’ mobility case. These mechanisms remains unreliable bringing latency and additional losses. It is for this reason that the QoS mechanisms deployment becomes an inevitable necessity. Several research works handled the QoS mechanisms in the Wi-Fi or WiMAX homogeneous wireless networks (Horizontal Handover). According to our research, no scientific work has been done evaluating the heterogeneous network performance taking into account the presence of both technologies simultaneously (Vertical Handover) as well as their good configurations. Through this article, we will enhance and complete the earlier works by initiating the following points: (i) studying the QoS mechanisms in 802.11e and 802.16e networks, (ii) discussing the MIPv6 protocol deployment in a wireless network, (iii) evaluating and measuring the QoS impact on the network performance and real-time applications. These studies were conducted under OPNET Modeler simulator, by using the Voice over IP (VOIP) and Video Conference (VC) applications. The simulation parameters are: The network delay (Wi-Fi and WiMAX), the throughput, the jitter, the end-to-end delay, the MOS score and the loss rate.