Wireless LANs provide a broadband and mobile access to Internet, allowing multimedia mobile services to become a reality by using an alternative network to actual cellular systems. Simultaneously, the Internet user behavior is evolving to include VoIP and P2P services to the already traditional Web browsing, file transfer or e-mail. However, in this scenario, WLANs show several performance limi...

The IEEE 802.11e EDCA (Enhanced Distributed Channel Access) is able to provide QoS (Quality of Service) by adjusting the transmission opportunities (TXOPs), which control the period to access the medium. The EDCA has a fairness problem among competing stations, which support multimedia applications with different delay bounds. In this paper, we propose a simple and effective scheme for alleviat...

the type of the applications for which internet is being used has changed over the years. multimedia applications, real-time applications and game playing require quality of service. ieee has proposed ieee 802.11e, a quality of service extension to the wireless lan standard ieee 802.11. in this paper service differentiation ability of 802.11e is evaluated. identical traffic is considered for al...

In this paper, we suggest the use of the chi-square test for detecting backoff misbehaviour in IEEE 802.11 EDCA networks. A performance evaluation is performed to compare the chi-square test with two other methods, known in the literature. To perform a suitable comparison, these two methods are extended to support EDCA and the BEB mechanism. We assume a misbehaviour model, which can be easily e...

We present an analytical framework to model the sending queue of an IEEE 802.11 EDCA wireless station that uses the TXOP limit MAC parameter to send more than one packet in each transmission opportunity. An application of this model to the estimate of packet delay from the number of packets received at the AP in each transmission is presented. This method is well suited to be deployed in an inf...

Enhanced Distributed Channel Access is a priority mechanism which supports access category (AC) wise QoS by differentiating initial contention window (CW) size and arbitration inter-frame space (AIFS) time. EDCA has fixed range of CW and AIFS that has been chosen initially. In contemporary EDCA model AIFS parameter for each AC remains static, irrespective of number of stations in a network. We ...

With the explosive growth of multimedia services in today’s wireless communications, this paper addresses the Quality of Service (QoS) issue focusing on satisfying the throughput requirement for real-time multimedia applications. An Adaptive Transmission Opportunity (AD-TXOP) scheme for a distributed Wireless Local Area Network (WLAN) system based on IEEE 802.11e Enhanced Distributed Channel Ac...

This paper proposes an admission control algorithm that enables the upcoming IEEE 802.11e contention based Enhanced Distributed Channel Access (EDCA) to provide quantitative bandwidth guarantees for Wireless Local Area Networks (WLANs), rather than a relative prioritized service. The algorithm estimates the throughput that flows would achieve if a new flow with certain parameters was admitted, ...

The multimedia applications require the network to provide a trustworthy service suitable to meet their Quality of Service and real-time requirements, managing efficiently the available resources. In this paper we present a performing solution for the multimedia support over IEEE 802.11e networks that aims to combine both its Medium Access Control functions, Enhanced Distributed Channel Access ...