Listened to the following proposals:
|
1150/r1 |
Feedback-jamming Multicast ARQ results with capture effect |
Jochen Miroll |
|
1139/r1 |
OBSS Management Text |
Graham Smith |
|
1138/r1 |
Outline of Proposed OBSS Solution |
Graham Smith |
|
1137/r1 |
EDCA Bandwidth Factor |
Graham Smith |
|
1136/r1 |
AP Shut Out Neighborhood Effect |
Graham Smith |
|
0926/r4 |
Interworking with 802.1Qat |
Ganesh Venkatesan |
|
1215/r0 |
Non-contentious (internal review) comments assigned to BrianH |
Brian Hart |
|
1251/r0 |
Intra-AC Prioritization Use Cases |
Alex Ashley |
|
1157/r1 |
Explain OBSS issue as well as possible simulation scenarios for OBSS in TGac |
Takatori Yasushi |
Teleconferences
Jan ‘09 meeting (Los Angeles, California, USA)
Closing Report is in document 09/1269r1
Meeting Minutes are in document 09/1270r0
The Task Group did not meet.
Listened to the following proposals:
1.
Stream Classification Service (09/0725r0)
2.
Implementation for Intra-AC Differentiated
Services (09/0022r1)
3.
Applicability of 802.11s MCCA to HCCA OBSS
(09/0660r3)
4.
OBSS Sharing with Access Fraction (09/0662r2)
5.
40MHz Channel Selection (09/0740r0)
6.
HCCAOP Scheme – Efficiency and Sharing
(09/0666r3)
7.
Proposal for OBSS (09/0757r1)
8.
Agenda for Joint Meeting with 802.1AVB
(09/787r0)
9.
20MHz versus 40MHz for Video (09/805r0)
10.
OSQAP OBSS Requirements Compliancy (09/0882r0)
11.
Neighborhood Capture and OBSS (09/0844r0)
In
addition to these presentation Graham Smith presented an overview of TGaa Goals
for OBSS to TGac (09/762r0).
Adopted the Drop Precedence submission into TGaa Draft
(09/726r1)
Listened to the complete OBSS solution (09/757r1)
Joint meeting with 802.1AVB
Decided not to meet in the September Interim
Listened to proposals/simulation results
Noted a 4 month slip in the TGaa timeline
Teleconferences
Nov ‘09 meeting (Atlanta, Georgia, USA)
Closing Report is in document 09/0891r0.
TGaa will not be meeting in Waikaloa, Hawaii in September 2009
Listened to the following proposals:
12.
Considerations for OBSS Sharing Using QLoad element
(09/497r2)
13.
Considerations for Statistical Multiplexing Support for
OBSS (09/496r2)
14.
OBSS Simulations/Results
15.
More Reliable Multicast/Broadcast results
09/528r1
Vice-Chair -- Elected Alex Ashley as Vice-Chair for the Task Group
Listened to proposals/simulation results
Others
Internal review of Draft 0.01
Timeline review
Plan for the joint meeting with 802.1AVB (in the July plenary)
Teleconferences
·
Continue with OBSS discussions
·
Address review comments
·
Aggressively address other topics from TGaa PAR
·
Prepare presentations for joint meeting with AVB
July ‘09 meeting (San Francisco, California, USA)
·
Converge on a framework for OBSS
·
Complete internal review of D0.01
·
Make progress on other PAR topics
Closing Report is in document 09/0613r0.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Listened to the following proposals (* at the joint meeting with 802.1AVB):
1. Distributed Channel Assignment 09/285r0 Andrew Myles
2. OBSS Analysis of Channel Requirements 08/1470r4 Graham Smith
3. Overlapping BSS Proposal 09/230r0 Graham Smith
4. OBSS OSQAP QoS Issues 09/347r0 Graham Smith
5. Efficient Error Control Using Network Coding for Multicast Transmission 09/277r0 Kevin Rhee
6. Feedback-jamming Multicast ARQ 09/.290r0 Jochen Miroll
7. Quasi-reliable Multicast 09/247r0 Jochen Miroll
8. More Reliable GroupCast Proposal Present 09/340r0 Hang Liu
9. Drop Precedence in wireless, wired-wireless networks* 09/264r0 Alex Ashley
10. AVB DMN and 802.11 09/0403r0* Philippe Klein
11. Group addressed normative text 08/1244r2
OBSS
·
Listened to four presentations on OBSS in the context of
TGaa
·
Started discussions on a strategy and plan for OBSS
Reliable Multicast
·
Reviewed the harmonized set of Reliable Multicast
mechanism(s)
·
Listened to 2 additional proposals on reliable
multicast
·
Adopted harmonized Reliable Multicast mechanism(s) into
TGaa draft
Joint Meeting with 802.1AVB
·
How to accommodate SRP in 802.11?
·
Strategies for priority levels, precedence levels and drop
precedence
Teleconferences
· Layout a OBSS strategy and plan
· MRG discussions
· Additional mechanisms for Reliable Multicast
· Address other topics from TGaa PAR
May ‘09 meeting (Montreal, Quebec, Canada)
· Continue activities from teleconferences
· Technical presentations on TGaa PAR topics
· Review and improve TGaa draft
Closing Report is in document 09/0384r0.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Listened to the following proposals:
Agreed on a constrained definition of OBSS, for which TGaa will specify a solution. The definition is:
OBSS Definitions:
1. OBSS edge: Any two APs operating in the same channel and can hear each other (either directly or via a STA associated to one of the APs)
2. OBSS Graph: A graph where APs are nodes of the graph and the edges are OBSS edges and every AP within the OBSS graph can be connected via one or more OBSS APs to every other AP in the OBSS graph
3. Length(OBSS graph): Longest shortest path between any two APs in the OBSS graph
4. Size(OBSS graph): Number of nodes (APs) in the OBSS graph
Scope of the 802.11aa OBSS Solution:
if length(OBSS graph) <= 2 and the size(OBSS graph) <=3 , enable the OBSS QAP solution otherwise (a) backoff to legacy (non .11aa) mode or (b) use a different solution
1.
Adopt reliable multicast proposals into the
draft
2.
Review and converge on OBSS definition/solution
4.
Complete Draft 0.01
Closing Report is in document 09/0172r0.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Listened to updates on 4 technical
proposals
·
Listened to a presentation from 802.21 SG "Handover to
Broadcast Technologies"
Met jointly with 802.1AVB
input to 802.1Qat Designated MSRP Node specification describing interworking with 802.11
Listen to technical proposals
Review/Approve Normative submissions corresponding to technical proposals
Start Draft 0.01 of TGaa amendment
Intra-Access Category prioritization of transport streams by modifying EDCA timing and parameter selection without any requirement for deep packet inspection
1.
08-1012r0 Harmonizing Multicast Proposals
2.
08-803r1 Multicast/Broadcast Communication with
Acknowledge
1.
a tutorial on 802.11e, specifically on TSPECs and what they
mean; management interface to 802.11 QoS, (by 802.11)
2.
a tutorial on 802.1Qat, specifically the traffic classes
and what their delay/latency and throughput characteristics are (by 802.1AVB)
and
3.
define a map between each 802.1Qat traffic class to 802.11 TSPECs
(jointly).
·
Recognized the need for a
requirements document for OBSS and Reliable Multicast/Broadcast statements in
the PAR Scope.
· Listened to 14 technical presentations:
1.802.11 Packets and MPEG Frames – Background (08/717r1)
2.OBSS Requirements (08/765r0)
3.OBSS Complexity (08/864r0)
4.OBSS Follow up (08/457r3 – VTS document)
5.Managed Contention Access (08/818r1)
6.Multicast/Broadcast Communication with Acknowledgement (08/803r0)
7.Block ACK Enhancements for Multicast Transmissions (08/809r1)
8.More Reliable Broadcast/Multicast (08/816r1)
9.Group Block Acknowledgements for Multicast Traffic (08/766r0)
10.EDCA Enhancements to Improve Link Reliability for Multicast Streams (08/810r0)
11.Robust Multicast/Broadcast Protocol (08/587)
12.Using Packet Drop Precedence for Graceful Degradation (08/764r0)
13.Requirement and Implementation for Intraflow and Inter-AC Diffserv (08/857r0)
14.VTS Frame Structure (08/802r0)
· Met jointly with 802.1AVB
·
Elected TG officers -- Chair (Ganesh Venkatesan,
Intel Corporation) /Technical Editor (Hang Liu, Thomson, Inc)/Secretary
(--open--)
· Established a time line for the project:
· Internal Review. Comment Resolution May ’09 (completed by)
· WG Letter Ballot, Comment Resolution Nov ‘09
· WG Recirculation, Comment Resolution Mar ‘10
· Sponsor Ballot, Comment Resolution Sep ‘10
· Sponsor Ballot Recirculation, Comment Resolution Jan ‘11
· Submission to RevCom for Ratification/Publication May ‘11
·
Joint meeting with 802.11v -- describe Directed
Multicast and determine if Directed Multicast belongs in 802.11v or
802.11aa. Conclusion is that Directed Multicast belongs in 802.11v
· Listened to three technical presentations:
·
Obtained WG approval for VTS PAR (document
07/1972r13)
·
Reviewed comments on VTS PAR from NESCom and submitted comment
resolutions to NESCom.
·
Listened to two technical presentations:
o
Documents 08/0249r0, 08/0263r1 -- Synchronous
Collision Resolution and
o
Document 08/303r2 -- Robust Multicast/Broadcast
· Joint Meeting with 802.1AVB:
1. Discussed 802.lQav/802.1Qat requirements in order to recommend appropriate 802.11 TSpec and TCLAS parameters
· Define the mapping from the parameters in Stream Reservation Request into 802.11 TSpec(s)
· Define requirements for information on the state of an 802.11 link and expectation from an 802.11 link that AVB can use
· 4-address frame with a special RA
· 6-address format that encapsulates the original 802.3 frame
·
Obtained WG approval to request ExCom to extend VTS SG -- Vote:
45-4-7
·
Obtained WG approval for the PAR/5C submission
(07/1972r14) -- Vote: 43-4-4
·
ExCom meeting results:
1.
VTS SG PAR Approval --> Moved/Seconded
Kerry/Jeffree Vote: 15/0/0
2. VTS SG extension --> Moved/Seconded Kerry/Karl Stevenson Vote: 14/0/1
·
Brainstormed on the PAR Scope to ascertain that
the scope clearly reflects the intent of the VTS project.
·
Listened to one presentation (document 08/0165r0)
as part of the discussion around enhancements pertinent to Broadcast/Multicast
of Video Streams.
·
Completed the discussion and developed an amended
scope. An updated PAR/5C submission (document 07/1972r11) incorporated the
amended scope.
·
Approved the PAR/5C document to be forwarded to
the WG for approval.
·
The WG approved the VTS SG PAR/5C submission
(07/1972r11). Since there was no quorum at this meeting, the VTS SG PAR/5C submission need to be re-affirmed at the
March 2008 plenary meeting.
There are still some concerns on the VTS SG PAR/5C submission (includes two spelling errors). The issues will be discussed and addressed in the teleconferences.
Tuesday Nov-13-2007 PM2:
· Video Capabilities of 11n devices (07/2766r0 Michael Livshitz)
· Multi-packet FEC (07/2847r1 Alex Ashley)
· Improvements to 802.11 for Video Applications (07/2685r1 Graham Smith)
· Multicast Enhancements for Multimedia streaming (07/2842r0, Denis Pankratov)
The intent of the second presentation was to add to the VTS SG scope the item "Link Adaptation Mechanisms".
Wednesday Nov-14-2007 PM2 (Joint meeting with 802.1):
· Presentation “Modified FCS/ARQ Behavior” – Todor Cooklev (07/2874r1)
Two straw polls were conducted following the above presentation to understand member interest in the techniques proposed in the above presentation --
1. An approach to partition a packet into ‘sensitive’ and ‘not sensitive’ parts, ascertain that the ‘sensitive’ part arrived at the received intact and if it did, allow the ‘not sensitive’ part to be propagated to upper layers without verifying if it did arrive intact.
2. An approach to add an additional encoding at the Transmitter and a corresponding decoding layer in the receiver in order to benefit from inter-packet FEC.
The straw polls and the corresponding results are :
Straw Poll-1
Allowing the 802.11 MAC layer to pass bit errors in the “unprotected” part of the packet:
Should remain in the VTS SG PAR?
Yes: 19, No: 34
Straw Poll-2
Should the VTS SG PAR include a MAC-level FEC?
Yes: 26, No: 19
Based on the straw polls, it is clear that member interest in the technique is low.
A joint review of the VTS SG PAR submission (section 5.2 scope) and the scope statement was modified to read as follows:
5.2 Scope of Proposed Standard: This amendment defines enhancements to the 802.11 MAC for robust video streaming. The MAC enhancements specified in this amendment are:
- Interworking with relevant 802.1 mechanisms including, but not limited to, 802.1Qat, 802.1Qav and 802.1AS
- Link Adaptation Mechanisms
- Increased robustness in overlapping BSS environments, based upon enhancing existing 802.11 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.
Straw poll on support for the above scope statement:
Do you think the scope statement in Slide#21 is appropriate for VTS SG?
Yes: 57, No: 4
Monday Sep-17-2007 PM2:
Wednesday Sep-19-2007 PM2:
§ Update document 07-1972/r5 with comments from the mid-week plenary discussion
§ Review the document to verify of NesCom requirements are addressed satisfactorily
At the closing plenary the WG Motion to approve document 07-1972r6 and (a) forward it to ExCom for approval and (b) forward it to 802.1avb for consideration was amended. The amended motion reads "move to forward the PAR and 5 Criteria document IEEE-802.11-07-1972r6 to 802.1avb for consideration".
A following straw poll was conducted to understand what the Working Group members prefer in terms of the contents of the VTS SG PAR. The choices were:
Option-A: the scope statement defines the general problem space – video streaming over 802.11. The specifics of what is included and what is not is defined by the TG in a “principles” or “requirements” document (3)
Option-B: the scope statement is detailed enough to describe the specific areas that will be the focus of VTS (13)
Option-C: the scope statement defines the general problem space but section 7.4 of the PAR document will include the specifics (8)
None of the above: (1)
The goal for the Nov 2007 802.11 Plenary meeting is:
VTS
Study Group Report
The VTS Study
Group met at the following times -
Wednesday July-18-2007 PM1:
Wednesday July-18-2007 PM2 (jointly with 802.1AVB) :
§ Felix (802.1AVB member) presented an outline of the 802.1av Stream Reservation Protocol
The goal for the Sep 2007 802.11 Interim meeting is to continue to discussions related to the VTS SG PAR/5C document, complete it and forward the document for WG approval.
VTS
Study Group Report
The VTS Study Group met twice during the week - Tuesday
May-15-2007 and Wednesday May-16-2007 at the Fairmont The Queen Elizabeth Hotel in Montreal, Quebec.
The goal
for the July 2007 802 meeting is to continue to discussions related to the VTS
SG PAR/5C document, complete it and forward the document for WG approval.
USEFUL LINKS TO OTHER SITES:
IEEE P802.11 WLANs RELATED
OTHER SITES
This page is maintained by Ganesh Venkatesan and Alex Ashley. Comments are welcome.