Estudio comparativo de Calidad de Servicio utilizando simulación en una WLAN con el estándar IEEE 802.11e para tráfico de voz, video y datos

Abstract

This project aims to test the Quality of Service using the NS2 network simulator, in an infrastructure WLAN for voice, video and data with IEEE 802.11g and IEEE 802.11e standards by the EDCA (Enhanced Distributed Channel Access) and HCCA (Hybrid Coordination Function Controlled Access) access types. The project describes the concepts relating to IEEE 802.11 WLANs, by analyzing its main features, operation and architecture. Subsequently, the features, operation, frame formats and procedures for EDCA and HCCA access methods, which are present in the IEEE 802.11e, are studied. The characteristics used for voice, video and data traffic are presented. The different simulation scenarios are illustrated with their physical topologies and distribution of wireless stations. Finally the project presents, validates and analyzes the results of simulations for each proposed scenario. In these scenarios, comparative studies are carried out to analyze the performance of DCF (Distributed Coordination Function), EDCA and HCCA methods access for each type of traffic, using metrics such as baud rate, end-to-end delay and packet loss rate. Furthermore, the effect of variation of the EDCA parameters, like AIFSN, CWmin, CWmax and TXOPlimit are studied.