An Improved UDP Protocol for Video Transmission Over Internet-to-Wireless Networks. Haitao Zheng and Jill Boyce. IEEE Transaction on Multimedia. Leif 9/10/01. Outline. Introduction Improved UDP Design Packet Coding Design Analytical Performance Conclusion Further Work.
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Haitao Zheng and Jill Boyce
IEEE Transaction on Multimedia
Retransmission and CRC (header and payload)
no retransmission, CRC (head only)
(n, k) RS codeword: the encoder chooses k packets and generates n – k parity packets. It can correct n – k erasures.
(For FEC decoders that require erasure indicator)
Error indicators contain the starting and ending location of the erroneous frame.
(For FEC decoders that can recognize erasures)
The FEC encoder takes one data unit from each of k packets and generates (n - k) parity units (additional packets). It can recover (n - k) erasure packets.
MDS code (n, k) ~ (7, 4) It can recover 7 – 4 = 3 erasure packets.
X/L MDS (nL, kL) L : column number
eg. Fig. 3. (b)
L = m = 7(nL, kL) ~ (49, 28)
49 – 28 = 21
Two states, good (G), and bad (B)
Transmission probability between the two states PGB and PBG present the error model.
Congestion Packed Loss Rate