Joint source-channel coding and optimization for mobile video streaming in heterogeneous wireless networks
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RESEARCH
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Joint source-channel coding and optimization for mobile video streaming in heterogeneous wireless networks Jiyan Wu1* , Yanlei Shang1 , Jun Huang2 , Xue Zhang1 , Bo Cheng1 and Junliang Chen1
Abstract This paper investigates mobile video delivery in a heterogeneous wireless network from a video server to a multi-homed client. Joint source-channel coding (JSCC) has proven to be an effective solution for video transmission over bandwidth-limited, error-prone wireless networks. However, one major problem with the existing JSCC approaches is that they consider the network between the server and the client as a single transport link. The situation becomes more complicated in the context of multiple available links because involving a low-bandwidth, highly lossy, or long-delay wireless network in the transmission will only degrade the video quality. To address the critical problem, we propose a novel flow rate allocation-based JSCC (FRA-JSCC) approach that includes three key phases: (1) forward error correction redundancy estimation under loss requirement, (2) source rate adaption under delay constraint, and (3) dynamic rate allocation to minimize end-to-end video distortion. We present a mathematical formulation of JSCC to optimize video quality over multiple wireless channels and provide comprehensive analysis for channel distortion. We evaluate the performance of FRA-JSCC through emulations in Exata and compare it with the existing schemes. Experimental results show that FRA-JSCC outperforms the competing models in improving the video peak signal-to-noise ratio as well as in reducing the end-to-end delay. Keywords: Mobile video streaming; Heterogeneous wireless networks; Multi-homing; Joint source-channel coding; Flow rate allocation
1 Introduction In the past few years, mobile video streaming (e.g., Youtube [1] and Hulu [2]) has become one of the most popular applications, and video traffic headed for handheld devices (e.g., smart cell phones and iPad) has experienced explosive growth. According to the Cisco Visual Index [3] report, video streaming accounts for 57% of mobile data usage in 2012 and will reach 69% by the year 2017. Global mobile data is expected to increase 13fold between 2012 and 2017. Furthermore, high-definition video has surpassed the standard definition video by the end of 2012 and will comprise 79% of video traffic by 2016. Although the proliferation of wireless infrastructures has offered the users with many access options (e.g., *Correspondence: [email protected] 1 State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876, People’s Republic of China Full list of author information is available at the end of the article
cellular networks, wireless local area network (WLAN), and Worldwide Interoperability for Microwave Access (WiMAX)), it is still a challenging problem to efficiently provide mobile video streaming services due to performance limitations of single wireless networks. Current WLAN systems ca
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