Compressed Video over Networks
Compressed Video over Networks
Quality of service schemes for IEEE 802.11 wireless LANs: an evaluation
Mobile Networks and Applications
UMAV: A Simple Enhancement to the IEEE 802.11 DCF
HICSS '03 Proceedings of the 36th Annual Hawaii International Conference on System Sciences (HICSS'03) - Track 9 - Volume 9
Energy-Efficient Real-Time Scheduling in IEEE 802.11 Wireless LANs
ICDCS '03 Proceedings of the 23rd International Conference on Distributed Computing Systems
Improving the Aggregate Throughput of Access Points in IEEE 802.11 Wireless LANs
LCN '03 Proceedings of the 28th Annual IEEE International Conference on Local Computer Networks
CIC'02 Proceedings of the 7th CDMA international conference on Mobile communications
A scheduling algorithm for QoS support in IEEE802.11 networks
IEEE Wireless Communications
Cross-layer wireless multimedia transmission: challenges, principles, and new paradigms
IEEE Wireless Communications
A Simple Analytical Model for Expected Frame Waiting Time Evaluation in IEEE 802.11e HCCA Mode
Wireless Personal Communications: An International Journal
Novel MPEG-4 video cross-layer algorithm in wireless networks
International Journal of Computational Science and Engineering
A new MAC scheme specifically suited for real-time industrial communication based on IEEE 802.11e
Computers and Electrical Engineering
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With the increased popularity of wireless broad-band networks and the growing demand for multimedia applications, such as streaming video and teleconferencing, there is a need to support diverse multimedia services over the wireless medium. In order to efficiently address these diverse needs, efforts have been pursued to provide Quality of Service (QoS) mechanisms for medium access, resulting in a standard called IEEE 802.11e. One of the enhancements proposed in IEEE 802.11e is a polling-based access mechanism, which is targeted for real-time multimedia flows. In this polling-based scheme, scheduling and time allocation are based on flow reservations. Hence, the effectiveness of the mechanism is heavily dependent on the accuracy of the flow requirements in the reservation. Flow requirements, however, can vary over time and an allocation based on fixed reservations cannot address this variability. This limitation, which is present in the reference scheduler of IEEE 802.11e, leads to degraded multimedia quality for flows with variable requirements, even when channel resources are available. In order to address the above limitation, we present an adaptation framework that dynamically adjusts the polling-based access mechanism and associates flows to different modes of access (polling-based/contention-based), according to the current needs of the application, as opposed to solely relying on the reservation parameters. We demonstrate that with our adaptation, the achieved QoS for real-time multimedia streams, in terms of delay and throughput metrics, can be significantly improved compared to other known mechanisms. Additionally, we show the benefits of our adaptation framework on overall multimedia quality and system capacity.