Under heterogeneous radio conditions, Wireless LAN stations may use different modulation schemes, leading to a heterogeneity of bit rates. In such a situation, 802.11 DCF allocates the same throughput to all stations independently of their transmitting bit rate; as a result, the channel is used by low bit rate stations most of the time, and efficiency is… (More)
— In this paper, we propose ARME (Assured Rate MAC Extension), an extension of the IEEE 802.11 MAC protocol to provide throughput guarantees. The proposed extension relies on the Distributed Coordination Function (DCF) with a modified algorithm for the computation of the Contention Window (CW). Best Effort service (with no throughput guarantee) is supported… (More)
— With Weighted Fair Queuing, the link's bandwidth is distributed among competing flows proportionally to their weights. In this paper we propose an extension of the DCF function of IEEE 802.11 to provide weighted fair queuing in Wireless LAN. Simulation results show that the proposed scheme is able to provide the desired bandwidth distribution independent… (More)
—The enhanced distributed channel access (EDCA) mechanism of the IEEE 802.11e standard provides quality-of-service (QoS) support through service differentiation by using different medium-access-control (MAC) parameters for different stations. The configuration of these parameters, however, is still an open research challenge, as the standard provides only a… (More)
— In this letter we present a model to analyze the delay behavior of the EDCA mechanism of IEEE 802.11e. Simulation results validate the accuracy of our analysis.
n recent years, much interest has been devoted to the design of wireless local area networks (WLANs) with quality of service (QoS) support. The Enhancements Task Group (TGe) was formed under the IEEE 802.11 project to recommend an international WLAN standard with QoS. This standard is called 802.11e and is being built as an extension of the basic WLAN… (More)
A thorough understanding of the power consumption behavior of <i>real world</i> wireless devices is of paramount importance to ground energy-efficient protocols and optimizations on realistic and accurate energy models. This paper provides an in-depth experimental investigation of the per-frame energy consumption components in 802.11 Wireless LAN devices.… (More)
In this paper, the concept of fairness as a future field of research in computer networks is investigated. We motivate the need of examining fairness issues by providing example future application scenarios where fairness support is needed in order to experience sufficient service quality. We further demonstrate how fairness definitions from political… (More)