Dynamic packet aggregation to solve performance anomaly in 802.11 wireless networks
Proceedings of the 9th ACM international symposium on Modeling analysis and simulation of wireless and mobile systems
Study of the QoS of video traffic over integrated 3G-WLAN systems
MobiMedia '06 Proceedings of the 2nd international conference on Mobile multimedia communications
Performance analysis under finite load and improvements for multirate 802.11
Computer Communications
Eliminating the performance anomaly of 802.11b
ICN'05 Proceedings of the 4th international conference on Networking - Volume Part II
IEEE 802.11n: enhancements for higher throughput in wireless LANs
IEEE Wireless Communications
Video session handoff between WLANs
ICACT'10 Proceedings of the 12th international conference on Advanced communication technology
Seamless video session handoff between WLANs
Journal of Computer Systems, Networks, and Communications - Special issue on WiMAX, LTE, and WiFi interworking
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Many new emerging applications involving real-time multimedia communications require sufficient bandwidth, as well as limited delay and minimized packet loss. In special, video streaming, that accounts for a large portion of the traffic in future networks, poses a difficult challenge to wireless networks, due to their strong requirements as well as to the great variability of channel conditions and contention based access commonly present in the wireless transmission medium. When considering an infrastructured WLAN, a performance anomaly is inherent to the use of the different versions of the IEEE 802.11 standard: when stations operate at different rates, the lowest rate station penalizes the higher rate stations, producing a degradation of the performance of the network. Moreover, the instability in the transmission rates and a low tolerance to noises and interferences lead to a difficulty of these nets to support delay sensitive traffics. These aspects make clear the strong need of development of QoS techniques to provide an effective resources management. In this paper we propose a new mechanism, to be implemented at Access Points, that involves a classification of stations based on the control of CTS and a limitation on the time the stations can use the media to accomplish their transmissions. Then, considering specific network requirements of video transmission as well as objective and subjective metrics of video quality, we conduct several discrete event based simulations with the use of NS-2 [3] and the Evalvid toolset [4][20], which prove the efficiency of the solution.