1. Drop Precedence in wireless, wired-wireless networks
March 2009
doc.: IEEE /0264r0
March 2009
Drop Precedence in wireless, wired-wireless networks
Date:
Authors:
Alex Ashley, NDS Ltd
Alex Ashley, NDS Ltd

2. March 2009
doc.: IEEE /0264r0
March 2009
Abstract
TGaa has “Graceful degradation of audio video streams when there is insufficient channel capacity, by enabling packet discarding without any requirement for deep packet inspection” in its PAR and has received two proposals relating to the addition of packet drop precedence in to
TGaa would like guidance from on the aspects of packet drop precedence that have interactions outside of
Alex Ashley, NDS Ltd
Alex Ashley, NDS Ltd

3. Drop Precedence Proposals
March 2009
Drop Precedence Proposals
TGaa has received two proposals endorsing the addition of packet drop precedence in to
Proposal
/0022r0 “Intra-AC Differentiated Service”
/0764r1 “Stream Classification Service”
Signalling
header
802.1ad C-TAG / DSCP
Priority Levels
8 (3 bits)
16 (4 bits)
Drop Precedence Levels
3 (2 bits)
1 (1 bit)
Alex Ashley, NDS Ltd

4. March 2009
Precedence Levels
TGaa would like guidance on how many precedence and priority levels it should support
How many priority levels does provide?
How many precedence levels does provide?
What sort of drop rules does define?
Alex Ashley, NDS Ltd

5. References Implementation for Intra-AC Differentiated Services
March 2009
References
Implementation for Intra-AC Differentiated Services
IEEE /0022r0
Using packet drop precedence for graceful degradation
IEEE /0764r1
Alex Ashley, NDS Ltd