1. Multicast/broadcast of video in VTS PAR Scopes
10/12/2018November 2007
November 2007
doc.: IEEE /2752r1
January 2008
Multicast/broadcast of video in VTS PAR Scopes
Date:
Authors:
Jun Li, Thomson Inc.
Peter Ecclesine, Cisco Systems

2. 10/12/2018November 2007
November 2007
doc.: IEEE /2752r1
January 2008
Abstract
This submission is a discussion if multicast/broadcast enhancements should be put in VTS SG PAR Scope.
Jun Li, Thomson Inc.
Peter Ecclesine, Cisco Systems

3. January 2008
Motivations
IPTV and mobile TV are one of most interested video applications emerging to the market that cannot be supported well without multicasting enhancement
Multicasting is addressed in various IEEE802 task groups in their scopes
802.1Qat: SRP supports one-to-many multicasting
802.11v: multicasting session diagnosis is a major function
802.21: to form a SG for handover between DVB and 802 radios
802.16: Multicasting / broadcasting service (MBS) is a key feature
Management packets are usually using multicasting
It is hard to address unicasting only without addressing multicasting in order to have a consistent amendment for video transport in coordination with other working group efforts
With multicasting effort mentioned explicitly can provide our 5C with stronger differentiation
Jun Li, Thomson Inc.

4. Issues to be addressed 802.11 multicasting is weak
January 2008
Issues to be addressed
multicasting is weak
No link rate adaptation, some AP simply fixed at lowest rate
No priority for multicasting over unicasting
No power-saving support
How to work together with other working groups
TGv / TGk for link adaptation
802.1Qat … for bridge with QoS support
Jun Li, Thomson Inc.

5. Work to do Desired features can be minimized
January 2008
Work to do
Desired features can be minimized
Link rate adaptation: 1) rate selection through API, or 2) algorithm based on TGv diagnosis results, no more difficult than unicasting link rate adaptation
Giving multicasting and/or AP downlink priorities: similar mechanism as described in extended EDCA
Most enhancement problems for unicasting can and should also apply to multicasting without much difficulty
The effort in VTS should be no more difficult comparing with other groups, 802.1Qat-SRP end-to-end QoS, TGv multicasting diagnosis, m MBS
Power-saving can be optional
There are compatibility issues but it is considered in TGv as well. We can leave it open without explicitly mentioning in PAR.
Jun Li, Thomson Inc.

6. January 2008
Decision
Should the phrase “Enhancement of multicast/broadcast for video streams with improved link reliability and QoS” be part of PAR?
Jun Li, Thomson Inc.