A Scheme of H.264/SVC Video Broadcasting over IEEE 802.11 WLAN

In this paper, we propose a novel scheme for efficient video broadcasting on WLAN using IEEE 802.11e HCCA MAC protocol and H.264/SVC video compression technology. We rearrange an outgoing sequence of H.264/SVC NAL units according to the prioritization of their dimension, temporal, and quality scalability. In addition, our proposed scheme broadcasts the prioritized NAL units as various data-rates of PHY. Our scheme is implemented in the NCTUns ver. 4.0 network simulator, and is evaluated in terms of the numerical results. A real video clip is used as the input to our simulation, and is compressed as VBR. In terms of throughput within delay bound of 1 second, all wireless stations by the proposed scheme receive 25~30% more video data than simple broadcast schemes with various data-rates. Moreover, the proposed scheme improves throughput during contention period of 8.4% as compared to the simple broadcast scheme which has a longer contention period. In the end-to-end delay examination, the proposed scheme controls under 5~10% of the simple broadcast scheme. Finally, the proposed scheme enhances the video quality that improves SSIM up to 6~7% than the simple broadcast scheme.