End-to-end internet packet dynamics
IEEE/ACM Transactions on Networking (TON)
Voice transmission in an IEEE 802.11 WLAN based access network
WOWMOM '01 Proceedings of the 4th ACM international workshop on Wireless mobile multimedia
Assessing the quality of voice communications over internet backbones
IEEE/ACM Transactions on Networking (TON)
A geometric approach to improving active packet loss measurement
IEEE/ACM Transactions on Networking (TON)
End to End Wireless Multimedia Service Modelling over a Metropolitan Area Network
UKSIM '09 Proceedings of the UKSim 2009: 11th International Conference on Computer Modelling and Simulation
IP Telephony Development and Performance over IEEE 802.11g WLAN
ICNS '09 Proceedings of the 2009 Fifth International Conference on Networking and Services
Softspeak: making VoIP play well in existing 802.11 deployments
NSDI'09 Proceedings of the 6th USENIX symposium on Networked systems design and implementation
Measurement and Analysis of the VoIP Capacity in IEEE 802.11 WLAN
IEEE Transactions on Mobile Computing
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Multimedia applications have been the key driving force in converging fixed, mobile and IP networks. A major hurdle in the realisation of this convergence is obtaining Quality of Service from a heterogeneous, best-effort service network. Interactive voice requires strict bounds on delay, jitter and packet losses, for Different Network Traffic Intensity, whereas video adds significant bandwidth requirements to the network, while Internet only makes its best effort to deliver a packet. Hence, the end-to-end QoS management of heterogeneous networks supporting multimedia services is of paramount importance. We present an empirical performance study of multimedia applications over 802.11 networks within metropolitan area networking environments. Specifically, we study the QoS performance of Voice over IP (VoIP) applications over 802.11-based networks, while sharing the network resources with HTTP and video applications. Using the OPNET simulator, we simulate several realistic application traffic scenarios, and we investigate the performance of VoIP applications by analyzing QoS parameters, such as delay, jitter, MOS, and packet loss ratio. Subsequently, the performance characteristics data of the network, which we obtain through simulations, are used to build a Markov model of the network performance to extend our analysis and gain further insight into the network performance dynamics.