Analytical Modeling for Delay-Sensitive Video Over WLAN

作者：Bobarshad Hossein^*; van der Schaar Mihaela; Aghvami A Hamid; Dilmaghani Reza S; Shikh Bahaei Mohammad R

来源：IEEE Transactions on Multimedia, 2012, 14(2): 401-414.

DOI：10.1109/TMM.2011.2173477

• Cross-layer
• delay
• expired-time
• retransmission
• video
• wireless local area network (WLAN)

Delay-sensitive video transmission over IEEE 802.11 wireless local area networks (WLANs) is analyzed in a cross-layer optimization framework. The effect of delay constraint on the quality of received packets is studied by analyzing %26quot;expired-time packet discard rate%26quot;. Three analytical models are examined and it is shown that M/M/1 model is quite an adequate model for analyzing delay-limited applications such as live video transmission over WLAN. The optimal MAC retry limit corresponding to the minimum %26quot;total packet loss rate%26quot; is derived by exploiting both mathematical analysis and NS-2 simulations. %26lt;br%26gt;We have shown that there is an interaction between %26quot;packet overflow drop%26quot; and %26quot;expired-time packet discard%26quot; processes in the queue. Subsequently, by introducing the concept of virtual buffer size, we will obtain the optimal buffer size in order to avoid %26quot;packet overflow drop%26quot;. We finally introduced a simple and yet effective real-time algorithm for retry-limit adaptation over IEEE 802.11 MAC in order to maintain a loss protection for delay-critical video traffic transmission, and showed that the average link-layer throughput can be improved by using our adaptive scheme.

• 出版日期2012-4