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Multi-packet FEC Date: Authors: November 2007 November 2007

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Presentation on theme: "Multi-packet FEC Date: Authors: November 2007 November 2007"— Presentation transcript:

1 Multi-packet FEC Date: 2007-11-13 Authors: November 2007 November 2007
doc.: IEEE /2847r1 November 2007 Multi-packet FEC Date: Authors: Alex Ashley, NDS Ltd Alex Ashley, NDS Ltd

2 November 2007 doc.: IEEE /2847r1 November 2007 Abstract This presentation describes an example of an end-to-end flow of video content in which a forward error correction code is applied. Alex Ashley, NDS Ltd Alex Ashley, NDS Ltd

3 Example IPTV Deployment
November 2007 doc.: IEEE /2847r1 November 2007 Example IPTV Deployment Content flows from VOD servers to the home via the core network. This flow has to provide end-to-end QoS. VOD Servers Retransmissions outside the home disabled, to avoid overloading network. DSLAM Core Network DSL Modem Alex Ashley, NDS Ltd Alex Ashley, NDS Ltd

4 November 2007 Multi-packet FEC A side-channel is added at the VOD server, which provides ‘n’ error correction data packets Ptotal = Pdata + Pprotection Receiver can create perfect picture with loss of any ‘n’ packets Alex Ashley, NDS Ltd

5 Example IPTV Deployment
November 2007 doc.: IEEE /2847r1 November 2007 Example IPTV Deployment VOD Servers 7 data packets + 3 FEC packets 1 2 3 4 5 6 7 8 9 One packet is lost in the core network DSLAM Core Network X DSL Modem Alex Ashley, NDS Ltd Alex Ashley, NDS Ltd

6 Example IPTV Deployment
November 2007 doc.: IEEE /2847r1 November 2007 Example IPTV Deployment VOD Servers One packet is lost over the DSL link One more packet can be lost, whilst still maintaining error-free video DSLAM Core Network 1 2 3 4 5 6 7 8 9 X DSL Modem X Alex Ashley, NDS Ltd Alex Ashley, NDS Ltd

7 November 2007 Multi-packet FEC & Over , all unicast traffic gets re-transmitted until positive ACK received Or MIB defined retry limit reached If an application level FEC is already in place, could be more intelligent in its retries A STA could reduce its retries if it had knowledge of higher level recovery technique Similar to puncture coding where bits are deliberately removed from the coded data to reduce over-the-air data Alex Ashley, NDS Ltd

8 November 2007 References Alex Ashley, NDS Ltd

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