Adaptive error control for fine-granular-scalability video coding over IEEE 802.11 wireless LANs

Xiaofeng Xu, M. van der Schaar, S. Krishnamachari, Sunghyun Choi, Yao Wang
2003 2003 International Conference on Multimedia and Expo. ICME '03. Proceedings (Cat. No.03TH8698)  
Robust streaming of video over the IEEE 802.11 Wireless LANs (WLANs) poses many challenges, including coping with bandwidth variations and data losses. To address these challenges, we evaluate and compare various error control strategies in this paper, namely, Medium Access Control (MAC) layer Forward Error Correction (FEC), MAC retransmission, and application-layer FEC, combined with FGS scalable video coding to achieve reliable communication over the IEEE 802.11 WLANs. Moreover, we assess the
more » ... performance of Fine-Grained Loss Protection (FGLP) for different multipath channel conditions. Furthermore, the performance of cross-layer strategies such as application-layer FEC with MAC retransmissions are also determined. 1. INTRODUCTION Currently, most wireless local area networks (WLANs) are predominantly used for data transfer. However, the higher bandwidth provided by new WLAN technologies such as IEEE 802.11a and IEEE 802.11g will ultimately lead to their increasing use for multimedia applications. Furthermore, the emerging IEEE 802.11e MAC standard will provide Quality-of-Service (QoS) for various applications. However, due to the error-prone, unpredictable characteristics of wireless links, the usage of WLANs for video transport poses many challenges, such as bandwidth variation and data losses. There have been many studies discussing the robust transmission of video over wireless networks. In [1-2], an Unequal Error Protection based Reed-Solomon (RS) codes and a hybrid Automatic Repeat Request (ARQ) are proposed for video packet transmission for WLANs. In [3] , an application layer adaptation is combined with the link layer packetization to achieve robust wireless video transmission based on the packet loss ratio, frame type, frame delivery deadline, etc. Multicast and unicast realtime video streaming over wireless LANs is presented in [4] , where the video multicast is formulated as an optimization of a maximum regret cost function across the multicast user space. However, most papers available in the literature solve the problem of bandwidth adaptation and robustness to packet-losses at the application-layer, without considering protection mechanisms provided by the lower network layers, such as the physical and MAC layers. In this paper, we investigate the performance of the FEC and ARQ protection mechanisms available at the MAC, and application layer for the robust and efficient transmission of Fine-Granular-Scalability (FGS) coded video [8] over IEEE 802.11 WLANs. FGS has been used in this paper because it provides fast adaptation to bandwidth variations as well as inherent resiliency and complexity scalability properties that are essential for efficient transmission over errorprone wireless networks. Nevertheless, the analysis and investigation performed in this paper for the various protection mechanisms can be easily extended, and will provide similar results when applied to alternative layered video coding schemes (e.g., data
doi:10.1109/icme.2003.1221006 dblp:conf/icmcs/XuSKCW03 fatcat:j4vgks2j6zeozpqlszwm4y2l5e