1. VTS SG PAR Scope Topics Date: 2007-12-17 Authors: January 2008
November 2007
doc.: IEEE /2752r1
January 2008
VTS SG PAR Scope Topics
Date:
Authors:
Ganesh Venkatesan, Intel Corporation
Peter Ecclesine, Cisco Systems

2. November 2007
doc.: IEEE /2752r1
January 2008
Abstract
This submission is a high level description of VTS SG PAR Scope topics.
Ganesh Venkatesan, Intel Corporation
Peter Ecclesine, Cisco Systems

3. November 2007
doc.: IEEE /2752r1
January 2008
What is in the PAR Scope?
Interworking with relevant mechanisms including, but not limited to, 802.1Qat, 802.1Qav and 802.1AS
Fine-grained packet discarding
Increased robustness in overlapping BSS environments, based upon enhancing existing mechanisms without the requirement for a centralised management entity.
Modified EDCA timing and parameter selection for video transport
Asynchronous multicast streaming independent of power save modes employed by associated stations.
Broadcast Video
802.1 “Wireless Bridge” proposal
Ganesh Venkatesan, Intel Corporation
Peter Ecclesine, Cisco Systems

4. January 2008
Interworking with 802.1*
Map 802.1Qat and 802.1Qav into ; 802.1Qat – Stream Reservation Protocol, 802.1Qav – forwarding and Queuing Enhancements for Time-Sensitive Streams.
*802.1AS support is already part of v.
Ganesh Venkatesan, Intel Corporation

5. January 2008
Interworking with 802.1
Ensure that 802.1Qat SRP – end-end QoS is supported as specified in 802.1Qat across links
Ensure that 802.1Qav ‘priority regeneration’ works seamlessly over links
Ensure that 802.1AS support in v is sufficient to provide the required Audio/Video Bridging support -- and if it is not sufficient augment v support for 802.1AS and make it complete.
Ganesh Venkatesan, Intel Corporation

6. Fine-grained packet discarding
January 2008
Fine-grained packet discarding
“Fine-grained ARQ and packet drop precedence to enable graceful degradation of video streams when there is insufficient channel capacity for the entire stream”
Goal is to provide mechanism that enables network to make better decisions about which packets to drop when network is congested or channel conditions deteriorate
Video is rather unusual in that it is a mixture of very important data, less critical data and duplicated data.
Analogue TV has a big advantage of a soft roll-off in performance as SNR decreases, whereas digital TV has an all-or-nothing cliff
By being more intelligent with the retransmission policy and packet discard policy, we can provide a graceful roll-off in performance
Ganesh Venkatesan, Intel Corporation

7. Overlapping BSS Issues
January 2008
Overlapping BSS Issues
Provide mechanisms so that a BSS can account for “relevant activities” in overlapping BSSs
“relevant activities” – example Admission Control
Need to address all OBSS scenarios – AP within OBSS, some non-AP STAs within OBSS while AP is not, etc.
Need to leverage existing mechanisms as opposed to inventing new mechanisms – extend public action frames.
Recommend parameter values in order to limit the scope of BSS overlap.
Ganesh Venkatesan, Intel Corporation

8. January 2008
Modified EDCA
Extend EDCA to accommodate multiple streams and differentiate between them
Packet re-ordering? Send more important data first
Finer priorities within AC_VI
Address cases where performance of a video stream is impacted when changes happen in another video stream – Rx2 moves causing video at Rx1 to be unacceptable
Prioritize Multicast/Broadcast over unicast – serve more Rxs for the same bandwidth
Ganesh Venkatesan, Intel Corporation

9. HCCA? Modified EDCA and/or simplified HCCA for video transport
January 2008
HCCA?
Modified EDCA and/or simplified HCCA for video transport
Document 2157r0 proposed an enhancement to EDCA
Is our goal to propose HCCA-like mechanism without the complexity of HCCA?
Note that all other wireless technologies – WiMAX, Bluetooth have a ‘scheduled’ medium access mechanism. Why is it considered bad for ?
Ganesh Venkatesan, Intel Corporation

10. January 2008
Broadcast Video
How to enable robust broadcast/multicast Video Streams?
Document 07/2954r1 – Video Broadcast/Multicast
Can replace “Asynchronous multicast streaming independent of power save modes employed by associated stations.”
Proposed replacements:
A protocol to enable improved reliability and rate adaptation for broadcast and multicast video traffic.
Enhanced multicast streaming with QoS, power-saving capabilities
Ganesh Venkatesan, Intel Corporation

11. 802.1 “Wireless Bridge” Proposal
January 2008
802.1 “Wireless Bridge” Proposal
Intention is to use a device as a wired-wireless bridge. A detailed discussion on this is planned for Feb 01, 2008.
Some of the issues discussed in the SF joint meeting – what happens when a wireless device is a part of a wired/wireless network? 4-address frames were proposed as a solution to mitigate some of the issues.
Is this covered by “Interworking with mechanisms” part of the scope?
Comment in the Atlanta joint meeting – wanted an explicit statement in the Scope.
Ganesh Venkatesan, Intel Corporation