1. Networked Media Lab. D EPT. OF I NFO. & Mech., GIST Individual Research Issue Jongryool Kim 2009.07.07 Networked Media Laboratory School of Information & Mechatronics Gwangju Institute of Science & Technology http://netmedia.gist.ac.kr

2. Networked Media Lab. D EPT. OF I NFO. & Mech., GIST December 4, 2015, Page 2 Real-Time Video Transmission using RLC Opportunistic Rouging Real-Time Video Transmission using Video-Aware Practical RLC and Opportunistic Routing Variable generation size RLC & Progressive RLC Deadline Discard at the Intermediate Node To enhance received video quality at multiple end nodes

3. Networked Media Lab. D EPT. OF I NFO. & Mech., GIST Real-Time Video Transmission using RLC Opportunistic Routing December 4, 2015, Page 3 Video Transmission to multiple users over wireless multi-hop network using RLC opportunistic routing Shorter paths are opportunistically exploited -> Reduced latency, fewer late arrival -> superior video quality RLC Opportunistic routing offers robustness in combating link breakage ->Reduced latency induced during route reconstruction -> no buffer underflow, no freezing of playback However, it should consider many things How to match the video with RLC ? (server) (Future Work) How many packets should be transported at the server ? (server) (Future Work) At the intermediate node, when it broadcast received packets ? (intermediate node) How to reduce RLC high processing complexity (receiver)

4. Networked Media Lab. D EPT. OF I NFO. & Mech., GIST Video Transmission using RLC December 4, 2015, Page 4 1. One-hop test (with simulation(?), VANET (?)) 1) RLC Complexity Test - RLC encoding bandwidth, RLC decoding bandwidth, and sending rate test with different or fixed size of generation - Time check: the time required to receive one frame (including RLC encoding, decoding, and video decoding times) 2) FEC Complexity Test - FEC encoding bandwidth, FEC decoding bandwidth, and sending rate test with different or fixed residual value - Time check: the time required to receive one frame (including FEC encoding, decoding, and video decoding times) 3) Video Test - Video PSNR and discontinuity check at the receiver ( without coding, with FEC and with RLC ) - Average video buffering levels at the receiver ( without coding, with FEC and with RLC ) 2. Multi-hop test (?)

5. Networked Media Lab. D EPT. OF I NFO. & Mech., GIST Video Transmission using RLC December 4, 2015, Page 5 How to match the video with RLC encoding block or generation ? In RLC, encoding and decoding size is very important factor Video has different size of frame Variable GOP = Generation (Variable Size Generation)