Journal ArticleDOI
Policy-based channel access mechanism selection for QoS provision in IEEE 802.11e
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This paper presents and analyses different CAM selection policies in order to derive the best-suited strategy in terms of system performance and proposes an optimal policy, based on traffic type and direction (uplink or downlink), which confirms the good performance of this new selection policy.Abstract:
The appearance of the 802.11e standard made the 802.11 wireless local area networks (WLANs) capable of providing different levels of quality of service (QoS). This standard defines two new channel access mechanisms (CAMs), namely the enhanced distributed channel access (EDCA) and the HCF controlled channel access (HCCA). The introduction of two CAMs increases the complexity of traffic management, since now not only the available resources have to be distributed, but also the optimal CAM for each data flow has to be selected. However, the best CAM selection algorithm is still not clear. This paper presents and analyses different CAM selection policies in order to derive the best-suited strategy in terms of system performance. From this study, an optimal policy, based on traffic type and direction (uplink or downlink), is proposed. The best user QoS satisfaction shown in the results confirms the good performance of this new selection policy.read more
Citations
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Journal ArticleDOI
Improving qos in wlan using dynamic weighted fair scheduling
TL;DR: The proposed Dynamic Weighted Fair Scheduling Scheme (DWFSS) to improve fairness in WLANs by enhancing the IEEE 802.11e standard scheduler increased average throughput and reduced average jitter while maintaining an acceptable level of end-to-end delay.
Techniques for Efficient Spectrum Usage for Next Generation Mobile Communication Networks. An LTE and LTE-A Case Study
TL;DR: A focus in this study is on development of schemes for inter-cell interference avoidance under fractional load conditions, which provide significant improvements in cell throughput and user outage throughput performance.
Journal ArticleDOI
Finite time-horizon Markov model for IEEE 802.11e
Cheng Kuan,Kaharudin Dimyati +1 more
TL;DR: By accurately capturing time-varying utilization, the FTHM model allows for generally distributed transmission-opportunity (TXOP) duration, which most existing models do not account for.
Book ChapterDOI
A Testbed About Priority-Based Dynamic Connection Profiles in QoS Wireless Multimedia Networks
DissertationDOI
Common Radio Resource Management Strategies for Quality of Service Support in Heterogeneous Wireless Networks
TL;DR: In this article, the authors propose two nuevos algoritmos, i.e., asignación dinamica de recusos conjunto (JDRA) and control de admision (JCAC), to assign recursos a usuarios and distribuir ususarios entre tecnologias al mismo tiempo.
References
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Proceedings ArticleDOI
Generating representative Web workloads for network and server performance evaluation
Paul Barford,Mark Crovella +1 more
TL;DR: This paper applies a number of observations of Web server usage to create a realistic Web workload generation tool which mimics a set of real users accessing a server and addresses the technical challenges to satisfying this large set of simultaneous constraints on the properties of the reference stream.
Proceedings ArticleDOI
IEEE 802.11 e contention-based channel access (EDCF) performance evaluation
TL;DR: The contention-based channel access mechanism, called enhanced distributed coordination function (EDCF), in comparison with the ECDF, is evaluated and it is concluded that the EDCF can provide differentiated channel access for different traffic types.
Proceedings ArticleDOI
Performance evaluation of IEEE 802.11e
TL;DR: This paper presents an evaluation of the QoS enhancements to the IEEE 802.11e standard, currently under specification, both the enhanced distributed coordination function (EDCF) and hybrid coordinationfunction (HCF) modes of medium access control (MAC) operation are analysed and compared with legacy distributed coordination functions (DCF) and point coordination function(PCF).
Journal ArticleDOI
A scheduling algorithm for QoS support in IEEE802.11 networks
TL;DR: The proposed algorithm is compatible with the link adaptation mechanisms implemented in commercial WLANs, as it limits the amount of time during which the stations control the wireless medium and follows a delay-earliest-due-date algorithm.
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