Document Type dissertation Author Name Li, Mingzhe URN etd-121206-095352 Title Using Bandwidth Estimation to Optimize Buffer and Rate Selection for Streaming Multimedia over IEEE 802.11 Wireless Networks Degree PhD Department Computer Science Advisors Mark Claypool, Advisor Mark Claypool, Advisor Robert Kinicki, Co-Advisor Robert Kinicki, Co-Advisor Emmanuel Agu, Committee Member Emmanuel Agu, Committee Member Constantine Dovrolis, Committee Member Constantine Dovrolis, Committee Member Michael Gennert, Department Head Michael Gennert, Department Head Keywords Playout Buffer Rate Selection Streaming Multimedia Wireless Networks Bandwidth Estimation Wireless Networks Streaming Multimedia Rate Selection Playout Buffer Bandwidth Estimation Date of Presentation/Defense 2006-12-04 Availability unrestricted
As streaming techniques and wireless access networks become more widely deployed, a streaming multimedia connection with the "last mile" being a wireless network is becoming increasingly common. However, since current streaming techniques are primarily designed for wired networks, streaming multimedia applications can perform poorly in wireless networks. Recent research has shown that the wireless network conditions, such as the wireless link layer rate adaptation, contending traffic, and interference can significantly degrade the performance of streaming media applications. This performance degradation includes increased multimedia frame losses and lower image quality caused by packet loss, and multiple rebuffering events that stop the media playout. This dissertation presents the model, design, implementation and evaluation of an application layer solution for improving streaming multimedia application performance in IEEE 802.11 wireless networks by using enhanced bandwidth estimation techniques. The solution includes two parts: 1) a new Wireless Bandwidth estimation tool (WBest) designed for fast, non-intrusive, accurate estimation of available bandwidth in IEEE 802.11 networks, which can be used by streaming multimedia applications to improve the performance in wireless networks; 2) a Buffer and Rate Optimization for Streaming (BROS) algorithm using WBest to guide the streaming rate selection and initial buffer optimization. WBest and BROS are implemented and incorporated into an emulated streaming client-server system, Emulated Streaming (EmuS), in Linux and evaluated under a variety of wireless conditions. The evaluations show that with WBest and BROS, the performance of streaming multimedia applications in wireless networks can be significantly improved in terms of multimedia frame loss, rebuffer events and buffer delay.
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