The IEEE 802.11e draft supplement standard provides Quality of Service (QoS) support for real-time applications. This paper focuses on performance evaluation of the 802.11e contention based access mechanism called Enhanced Distributed Channel Access (EDCA). It presents a comparative study of the different EDCA parameters selection and their impact on network utilisation and performance. The use...

Call Admission Control is one of the main mechanisms allowing an efficient protection of active flows, especially on a wireless network using a distributed access scheme as is the case for IEEE 802.11e EDCA. We proposed in a previous paper [5] a hybrid admission control algorithm (based on analytical model and on measurements) for EDCA which have proven to perform well when compared to another ...

The paper presents an analytical model for the performance evaluation of IEEE 802.11e EDCA scheme under finite load conditions on the basis of various instances of delay metric (i.e., media access delay, queuing delay and total delay). The simulation results show that the analytical estimated instances of the delay metric are almost accurate. The paper exhibits that concerning the delay of serv...

Based on some empirical observations, we present a fairly accurate assumption about the throughput performance under non-saturation conditions and when the system is near saturation. This allows us to find a closed form solution for the transmission probabilities and collision probabilities. These can be inserted into performance expressions derived from any available analytical model for 802.1...

Quality of Service (QoS) of IEEE 802.11e is currently under research for the upcoming multimedia applications over broadband wireless networks. IEEE 802.11e is a contention based channel access function that uses the enhanced distributed channel access (EDCA) techniques. EDCA statically resets the Contention Window (CW) after each successful transmission. This article discusses a fuzzy logic ap...

IEEE 802.11 Wireless Local Area Network (WLAN) is one of the most widely deployed wireless network technologies in the world today. The success of IEEE 802.11 mainly owes to its cost effectiveness, easy deployment and high data transmission rates. However, 802.11 MAC (Medium Access Control) algorithm is unable to support modern multimedia applications which require certain level of quality of s...

This paper deals with the problem of best effort traffic delivery in 802.11e contention-based networks. Differently from most previous paper which focus on the support of quality of service (QoS) requirements, we study the tuning of the access parameters for the best effort traffic. The contribution of this paper is threefold. First, we discuss the coexistence between legacy DCF and EDCA statio...

One of the key challenges in multimedia networks is video delivery over wireless channels. MRC (Multi-Resolution Coding) Layered video, divides video into a base layer and multiple enhancement layers. In this paper, we aim to improve video quality, impacted by high channel contention, through mapping individual video layers to EDCA (Enhanced Distributed Channel Access) access categories in orde...

We investigate the problem of efficient resource control for elastic traffic in IEEE 802.11e’s Enhanced Distributed Channel Access (EDCA) mechanism. Our approach considers an economic modelling framework based on congestion pricing that captures how various factors, such as the probability of attempting to transmit a frame, the use of the basic CSMA/CA or the RTS/CTS procedure, and the physical...