An analytical model for performance evaluation of multimedia applications over EDCA in an IEEE 802.11e WLAN

—We extend the modeling heuristic of [1] to evaluate the performance of an IEEE 802.11e infrastructure network carrying packet telephone calls, streaming video sessions and TCP controlled file downloads, using Enhanced Distributed Channel Access (EDCA). We identify the time boundaries of activities on the channel (called channel slot boundaries) and derive a Markov Renewal Process of the contending nodes on these epochs. This is achieved by the use of attempt probabilities of the contending nodes as those obtained from the saturation fixed point analysis of [2]. Regenerative analysis on this MRP yields the desired steady state performance measures. We then use the MRP model to develop an effective bandwidth approach for obtaining a bound on the size of the buffer required at the video queue of the AP, such that the streaming video packet loss probability is kept to less than 1%. The results obtained match well with simulations using the network simulator, ns-2. We find that, with ...

• Type: Journal
• Year: 2010
• Where: WINET
• Authors: Sri Harsha, Anurag Kumar, Vinod Sharma
• Keywords: IEEE 802.11e, Packet Loss Probability, Video Packet Loss, WINET 2010