IEEE P802.11 - Task Group p -
MEETING UPDATE
Status of Project IEEE 802.11
Task Group p
Wireless Access in Vehicular
Environments (WAVE)
Lee Armstrong, Chair
Wayne Fisher, Editor
Objective
This Task Group will define enhancements to 802.11 required
to support Intelligent Transportation Systems (ITS) applications.
WAVE is a mode
of operation for use by IEEE Std 802.11™ devices in environments where the
physical layer properties are rapidly changing and where very short-duration
communications exchanges are required. The purpose of this standard is to
provide the minimum set of specifications required to ensure interoperability
between wireless devices attempting to communicate in potentially rapidly
changing communications environments and in situations where transactions must
be completed in time frames much shorter than the minimum possible with
infrastructure or ad hoc 802.11 networks. In particular, time frames that are
shorter than the amount of time required to perform standard authentication and
association to join a BSS are accommodated in this amendment.
The P802.11p specification accomplishes the following:
• Describes the functions and services required by WAVE-conformant
stations to operate in a rapidly varying environment and exchange messages
either without having to join a BSS or within a WAVE
BSS.
• Defines the WAVE signaling
technique and interface functions that are controlled by the IEEE 802.11 MAC
This amendment to IEEE Std 802.11™ is based on extensive testing and analyses
of wireless communications in a mobile environment. The results of these
efforts were documented in ASTM E
2213-03, "Standard Specification for Telecommunications and Information
Exchange Between Roadside and Vehicle Systems - 5.9 GHz Band Wireless Access in
Vehicular Environments (WAVE) /
Dedicated Short Range Communications (DSRC) Medium Access Control (MAC) and Physical Layer (PHY) Specifications".
This document is available from: ASTM
International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA,
19428. This amendment to IEEE 802.11 is based on the ASTM
E 2213-03 document.
Please see document, 11-07-2045-00-000p-Development of DSRC/WAVE Standards, (latest version) for additional
information on the development of the amendment for WAVE.
May 2010
Sponsor Ballot #2 of P802.11p D11.0 closed on 4/7/10 with 99%
affirmative votes and no comments. All conditions for presenting this amendment
to 802.11 have been met. The necessary package has been prepared and submitted
to IEEE and this has been added to the June RevCom
agenda.
As a result, there are no more meetings
scheduled for TGp, either face-to-face or via
teleconference. The Tg will
not be terminated yet in the unlikely need to address any issues that arise as
a result of the RevCom meeting or the IEEE editing process.
March 2010, Orlando, Florida
Goals for March\
2010: Comment resolution for SB#1 and prepare for recirculation ballot
Sponsor Ballot #1 of P802.11p D10.0 passed with 96%
affirmative with 21 comments. The teleconferences leading up to the March
meeting allowed for much of the discussion required as a part of comment
resolution to take place prior to the meetings. During the Orlando meetings we
were able to complete the resolution of all comments and the editor was able to
complete all of the corresponding changes to the draft. As a result, we voted to
go to recirculation ballot #2 as soon as possible. Teleconferences will resume
after this ballot closes if needed.
The 802 ExCom
gave conditional approval to take P802.11p to the RevCom
June meeting. Such condition being that all conditions required for RevCom are satisfied.
January 2010, Los Angeles,
California
Goals for
January\ 2010: Comment resolution for SB#0 and prepare for recirculation ballot
Sponsor Ballot #0 passed (93.4% affirmative) with 156
comments. The teleconferences leading up to the January meeting allowed for
much of the discussion required as a part of comment resolution to take place
prior to the LA meetings. During the Los Angeles meetings we were able to
complete the resolution of all comments and the editor was able to complete all
of the corresponding changes to the draft. As a result, we voted to go to
recirculation ballot as soon as possible after the January meeting.
Teleconferences will resume after this ballot closes.
November 2009, Atlanta, Georgia
Goals for
November\ 2009: Comment resolution for LB154 and prepare for Sponsor Ballot
Letter Ballot 158 passed with no new comments. This has
allowed the start of Sponsor Ballot #0 which will close on 22 November. Since
the ballot has not yet closed, the November meeting will be spent in resolving
those comments received to date. Comment resolution will continue during the
weekly teleconferences after this meeting.
September 2009, Waikoloa Hawaii
Goals for
September\ 2009: Comment resolution for LB154 and prepare for Sponsor Ballot
LB154 was completed with 38 comments. Prior to and during the
week, most of these comments were withdrawn and some of the “disapprove” votes
were changed to “approve”. The result was a total of 15 comments and an
approval percentage of 91.8%. Of the 15 remaining comments, only one required a
change to the document (it was the result of an editing error and impacted only
a single word) and thus another recirculation ballot is required before we can
go to Sponsor Ballot. A recirculation of D9.0 will begin shortly after the
close of this week’s meetings. It is reasonable to expect that there will be no
new comments that would prevent us from going to Sponsor Ballot before the
November meeting.
July 2009, San Francisco
Goals for
July\ 2009: Comment resolution for LB151 and prepare for Sponsor Ballot
LB151 was completed with 180 comments, of which 95 were
editorial. During the week, with 5 time slots plus one ad-hoc slot available,
we managed to complete the resolution of all comments thanks to the advance
work done during our weekly teleconferences. A recirculation of D8.0 will begin
shortly after the close of this week’s meetings. In anticipation of having a
“clean draft” recirculation possible after the September meeting, we requested
and obtained conditional approval for going to Sponsor Ballot before the
November meeting.
May 2009, Montreal
Goals for
May\ 2009: Comment resolution for LB144 and prepare for Recirc
Ballot
LB144 was completed with 249 comments, of which 105 were
editorial. During the week, with 7 time slots available, we managed to complete
the resolution of all comments thanks to the advance work done during our
weekly teleconferences. A recirculation of D7.0 will begin shortly after the
close of this week’s meetings.
March 2009, Vancouver
Goals for
March\ 2009: Comment resolution for LB141 and prepare for Recirc
Ballot
Completed resolution of LB141 comments.
Current draft at end of meetings was D5.02. Voted to start a
recirculation ballot of D6.0.
January 2009, Los Angeles
Goals for
January\ 2009: Comment resolution for LB141 and prepare for Recirc
Ballot
LB141 of Draft 5.0 passed with 121 comments recieved. We made
major progress between the teleconferences before the meeting and during the 6
time slots of meetings this week. At the end of the week, there were about 59
outstanding comments remaining to be resolved. The most significant issue deals
with the basic question of : is a STA able to "communicate outside the
scope of a BSS" while that STA is still joined with a
BSS?There was lots of discussion, but no agreement. Until there is agreement on
this issue many of the remaining comment resolutions cannot be finalized.
November 2008, Dallas
Goals for
November\ 2008: Complete comment resolution for LB125 and go to Recirc Ballot
Comment resolution completed, and Draft 5.0 approved for
ballot. Weekly teleconferences (1500 ET every Thursday) will be suspended
during the ballot period but will resume after the close of the ballot so that
we can begin to work on resolving the new comments expected. .
September 2008, Waikolo
Goals for September\
2008: Complete comment resolution for LB125 and go to Recirc
Ballot
Comment resolution completed, but some objection because with
more time some different results might have occurred. The WAVE BSS feature was deleted from the draft
resulting in a major revision. The current draft is D4.02. There was a desire
to go to recirculation ballot in order to get WG review of such major changes
which is the reason that some comments were given less than ideal time for
review. The motion to go to recirculation ballot failed, so many comments will
be subject to reconsideration to determine if a different resolution might be
preferred. Weekly teleconferences (1500 ET every Thursday) will be held to
identify and revisit these comments.
July 2008, Denver
Goals for
March 2008: Continue comment resolution for LB125
Of the 489 comments received from LB125, 257 were editorial
and assigned to the editor to resolve. During the week a major event occurred
in that the appropriate resolution to all comments relating to the WAVE BSS would be to simply eliminate WAVE BSS from the draft. It was determined that
this capability, which was in support of higher layer standards (specifically
1609 set of standards for now but others may be created in the future), could
simply be eliminated with the onus on these other standards to provide whatever
capability would be required. There was approval from the 1609 WG to modify
their standards to adapt to this change in 11p. Weekly teleconferences (1500 ET
every Thursday) will be held to work on outstanding comments.
May 2008, Jacksonville
Goals for
May 2008: Begin comment resolution for LB125
LB 125 passed with 4989 comments received. Because the ballot
closed so close to the start of this week’s meetings, the majority of the time
spent this week was on comment triage with discussion of the most critical
comments. Weekly teleconferences (1500 ET every Thursday) will be held to begin
comment resolution.
March 2008, Orlando
Goals for
March 2008: Complete comment resolution for LB110 and go to Letter Ballot
Comment resolution continued. Some resolution proposals were
initiated and discussed during the multiple Ad-Hoc teleconferences held before
the meeting. During the meeting, these were discussed with a number of motions
resulting in the creation of draft D3.05 being produced at the end of the
meetings. At the close of the meeting, it was found that there were a couple of
comments that were not formally resolved but these were considered to minor to worry
about (primarily simple editorial). The motion to move D3.05 to Letter Ballot
passed and a 30 day LB will begin as soon as possible after the meeting. Weekly teleconferences will continue (with a
probable delay in starting until initial LB results are received). A
face-to-face Ad_Hoc meeting
is planned for the week of April 29 in Los
Angeles with the exact date and location to be
announced.
January 2008, Taipei
Goals for
January 2007: Complete comment resolution for LB110 and go to Letter Ballot
•
547 comments total
•
207 resolved prior to this week
•
410 resolved this week (some re-do from
previous meetings)
•
Essentially finished LB110 comment
resolution, a very small number not formally completed
•
Closed with Draft D3.03
Resolution of the 547 comments continued. There were a total
of 207 comments resolved prior to the meeting, an
additional 410 were resolved this week. Some comments were addressed more than
once such as when the resolution of a comment required us to go back and
reconsider a previous resolution. The TG is essentially finished with LB110
comment resolution (the operative word is “essentially” as Draft D3.03 which is
the result of the meetings is felt to be ready for letter ballot in spite of a
few random items that might still be addressed. Due to a lack of time, the TG
did not get to reach a point where the importance of any remaining issues could
be identified and discussed, thus there was no motion to go to Letter Ballot.
Weekly teleconferences will continue to identify and propose resolutions to any
remaining comments or issues.
November2007, Atlanta
Goals for
July 2007: Continue LB110 comment resolution
Comment resolution continued, with a total of 107 comments
resolved this week. There were many more that were nearly ready.to vote on and
complete, but time did not permit all submissions for presentation to be
addressed. Weekly teleconferences will continue to develop additional
resolutions.in preparation for the January meetings.
September 2007, Waikola
Goals for
July 2007: Begin comment resolution for LB110
LB110 failed by only two votes. Resolution of the 547
comments began with the primary order of activities being to get organized and
prioritized. Major catagories of comments, mostly by clause number, were
assiged to Individuals who would be responsible for them. About 100 were
considered closed at the end of the week (mostly editorial). Weekly
teleconferences would be held to work on the more difficult technical issues to
be resolve.
July 2007, San Francisco
Goals for
July 2007: Aapprove for Letter Ballot
All issues remaining from LB92 have been resolved and are
reflected in P802.11p D2.06. The TG approved requesting that the WG proceed
with a Letter Ballot of this draft with the goal of moving it towards sponser
ballot.
May 2007, Montreal, Quebec
Goals for May 2007: Resolve
Letter Ballot 92 Comments
The most significant remaining issue from LB92 (reflected in
approximately 200 comments) had to do with the use of a WAVE
announcement frame and not using an 802.11 beacon. Between the PAR and a large number of presentations, there had
been ample explanation that conventional beacons could not provide the
extremely short latencies required, this continues to come up.As a means of
addressing these comments in a manner that would be most acceptable to the WG,
a special form of beacon was approved which will be called an "on-demand beacon"
and use the ordinary 802.11 beacon format. The task of preparing the explicit
wording and incorporating this change into the draft was assigned and the
resulting draft will be the basis for teleconferences as soon as it becomes
available.
March 2007, Orlando, Florida
Goals for March 2007: Resolve
Letter Ballot 92 Comments
During the March meeting, 174 Comments addressed, 134
Comments Resolved. One proposal for resolving the many comments (over a
hundred) regarding the use of a WAVE
announcement instead of a beacon would use a slight modification to the beacon
instead of the WAVE announcement.
TGs is also considering a special beacon and we will investigate the potential of
either a new WAVE beacon or a new
beacon harmonized with TGs. Teleconferences will be held before the May meeting
and a joint meeting slot with TGs will be held as part of this investigation.
Of the original 1060 comments, 649 remaining to be resolved. Draft
2.01 is current working draft.
January 2007, London
Goals for January 2007: Respond
to Letter Ballot 92
LB92 failed with 1060 comments received. The TG accepted Draft
2.0 as the working draft. The comments were organized by topic and assigned to
individuals for resolution. About 500 considered simple editorial and assigned
to editor to resolve. Established general principles for resolving most of the
technical issues.
November 2006, Dallas, Texas
Goals for November 2006: Approval
for Letter Ballot of Draft 2.0
As a result of the approval of
Draft 1.3 at the September meeting and the editors directives for further
changes that were approved at that meeting, the editor had prepared a new draft
1.4. The Task Group started the session by voting to approve this new draft,
Draft 802.11p_D1.4 as our working document. There were 7 presentations during
the 4 session during the week, resulting in motions that resulted in additional
changes to be made to the draft. The
posted draft at the conclusion of the meeting, which includes all of the week’s
approved changes, is Draft 802.11p_D1.5. Feeling that this draft represents the
completion of comment resolution from LB81 as well as all additional
improvements identified since then, the TG moved to forward this draft to the
WG for Letter Ballot. The WG approved the motion and a Letter Ballot will
commence as soon as possible for this draft that will therefore be renumbered
to Draft 802.11p_D2.0.
An overview of CALM-related
projects and standards activities in Europe and their synergies with IEEE 802.11p efforts was presented
during the Monday Tutorial session. The presentations are linked here:
* Knut
Evensen (part 1 PDF)
* Dr. Hans-Joachim
Fischer (part 2 PDF)
* Knut Evensen (part 3 PDF)
* Dick Roy (VII)
(part 4 PDF)
A ZIP file of the Powerpoint
presentations is also available
September 2006,
Goals for September 2006: Review
and resolve comments from LB 81, prepare for Letter Ballot
The Task Group started the session by using Draft
P802.11p_D1.1 as the working document. The previous Clause 20 was moved into
Clause 17 and Annex I and Annex J. The PICs were greatly simplified. As a
result of general improvements, the page count has gone from 59 to 35. The
extent of the additions and deletions made it unrealistic to use revision
marking in the new draft. The meeting minutes can be found in document
11-06-1556-01-000p-melbourne-september-2006-wave-minutes-doc-doc.doc. The
posted draft at the conclusion of the meeting was Draft 802.11p_D1.3.
July 2006
Goals for July 2006: Review and
resolve comments from LB 81
The Task
Group started the session by voting to have the previous draft, P802.11p-D1.0,
that failed to receive the required 75% approval be the base draft for moving
forward. The group then began to formal comment resolution with discussion and
motion on Clause 20. There were 6 presentations during the 3 session
during the week. Teleconferences to continue resolving the comments from
the letter ballot. It is hoped that the revised draft will be ready for
approval during the September session.
March 2006
Goals for March 2006: Prepare for
LB81 comment resolution process, Review and resolve comments from LB 80
The LB89 passed, allowing the letter ballot of draft D1.0 (LB
81) to begin. There were enough comments received during LB80 to develop and
test our approach to comment resolution (borrowing heavily from other groups
experiences). We evaluated approximately 20 LB80 comments during the week,
verifying that TGp is ready to being responding to the many hundreds of
comments expected on LB81. Because all of the LB80 comments that we worked on
in March will also appear as LB81 comments, the resolutions agreed to will give
us a head start for the next meeting. Some of the comments proposed changes to
the draft that were generally agreed to in principle, but final judgment could
not be given until the final explicit editor’s instructions are available. An
ad-hoc group was formed to evaluate the impact of responding to these comments
and report at the next meeting. This group will be conducting teleconference
meetings over the next two months.
January 2006
Goals for January 2006:
Distribute 11p draft 0.25, obtain comments prior to meeting. Review and resolve
comments. Prepare 802.11p amendment for WG letter ballot
The draft D0.25 was reviewed, together with the comments
received prior to the meeting. All remaining D0.24 and all new D0.25 comments
were resolved. The editor will produce draft D0.26 (which will become D1.0 with
a letter ballot) based on the resolutions to these comments.
The TG understood 802.11 policies and procedures article
2.9.2 (specifically item 3) allowed going to letter ballot since the current
draft and all changes to it had been properly voted on and made available to
the WG. However, during the plenary, after making the motion to go to letter
ballot, item 4 was invoked: “Any voting member can bring a motion requesting
that, after the editor has completed the draft, work be approved by a fifteen
day confirmation letter ballot of the draft before submission to WG letter
ballot.” It was then necessary to
retract our motion for letter ballot and instead make a motion to have a 15 day
confirmation vote to be followed by a 40 day letter ballot if the confirmation
passes. The confirmation vote can occur only after the new draft .26 is
available and the voting list has been updated (which is at least 2 weeks from
the end of the meeting).
The impact is that it is impossible to have any letter ballot
results before the March meeting. Since the confirmation vote is simply a
yes/no response, and the letter ballot will most probably have just started at
the time of the March meeting, unless the unexpected happens, TGp will not meet
in March.
November 2005
Goals for November 2005:
Distribute 11p draft 0.24, obtain comments prior to meeting, Review and resolve
comments, Prepare 802.11p amendment for WG letter ballot
The draft D0.24 was reviewed, together with the comments
received prior to the meeting.
There were a total of 73 comments received for D0.24 and 19
remaining unresolved from D0.23 (some were withdrawn by the commenter,
explaining the different count then what was reported last month). During the
November meeting, all of the remaining D0.23 comments were resolved and 43 of
those pertaining to D0.24. Several comments that were expected to be approved
quickly instead produced lengthy discussion in the meeting which resulted in
our failure to resolve all ballots and move the draft to the Letter Ballot
stage.
The editor will produce draft D0.25 for posting and another
round of comments solicited from the members. A teleconference is planned for
December 13 to review proposed comment resolutions. Additional teleconferences
may occur as needed before the January meeting. Notice of such teleconferences
will be made using the 802.11 e-mail reflector. It is hoped that all comments
can then be resolved in such a manner that the draft can be approved to go to
letter ballot thereafter. Going to WG Letter Ballot in January 2006 does look like
a high probability.
September 2005
Goals for September 2005:
Distribute 11p draft 0.23, obtain comments prior to meeting, Review and resolve
comments, Prepare 802.11p amendment for WG letter ballot
The draft D0.23 was reviewed, together with the comments
received prior to the meeting.
There were a total of 107 comments received for D0.23, of
these we were able to address 74 before we ran out of time. Of these, 65 were
totally resolved, 9 addressed but still open. This left 33 comments that were
not addressed.
As a result of addressing these comments, there are a large
number of discrete edits to the document. The extent of these changes, plus the
number of comments left unresolved, means that it will be at least November
before we can consider moving to Letter Ballot.
The editor will produce another draft for posting by
October 14. Additional comments are to be submitted to the editor no later than
November 4 so that they can be consolidated for discussion at the next
meeting. At least one teleconference is
expected before November to review proposed comment resolutions. Notice of such
teleconferences will be made using the 802.11 e-mail reflector. It is hoped
that all comments can then be resolved in such a manner that the draft can be
approved to go to letter ballot thereafter. Based on the experiences of the
past two meetings, the best estimate for going to WG Letter Ballot is now
January 2006.
July 2005
Goals for July 2005: Distribute
11p draft, obtain comments prior to meeting, Review and resolve comments,
Prepare 802.11p amendment for WG letter ballot
The draft D0.22 was reviewed, together with the comments
received prior to the meeting. Almost all of the comments were completely
resolved but we ran out of time before completing them all. The WRSS carryover
from the previous the meeting resulted in clarification and wording that
satisfy the TG members. This should bring closure on this issue.
With resolutions identified for almost all comments, the
editor will produce another draft for posting by August 5. Additional comments
are to be submitted to the editor no later than September 5 so that they can be
consolidated for discussion at the next meeting. It is hoped that all comments
can be resolved in such a manner that the draft can be approved to go to letter
ballot thereafter.
May 2005
Goals for May 2005: Distribute
11p draft, obtain comments prior to meeting, Review and resolve comments,
Prepare 802.11p amendment for WG letter ballot
The draft D0.20 was reviewed, together with the 75 comments
received prior to the meeting. Most of the comments were completely resolved
but there were some that will require additional investigation to result in
suggested modifcations to the document. The WRSS review that took place prior
to the meeting failed to result in wording that would satisfy the TG members.
An ad-hoc meeting during the week produced a clarification of what was causing
the problem (an inability to succiently state the requirements), and an
approach for satisfying another concern with WRSS which was the perceived
advantages versus the benefits of this function. An action item for resolving
this before the next meeting was assigned. Another action item was created to
evaluate the relationship with 802.11j to verify that there are no
inconsitencies between the two documents. The other issue that resulted in an
action item was to resolve comments regarding testability of some parts of the
specifications.
It is hoped that the resolution of these comments will result
in a draft which is suitable for WG ballot after the July meeting. The next
draft will be prepared and be available for TG commenting by June 13.
March 2005
Goals for March 2005: Distribute
11p draft, obtain comments prior to meeting, Review and resolve comments,
Prepare 802.11p amendment for WG letter ballot
The draft D1.2 was not completed on schedule, thus the
comments received prior to the meeting were not as extensive as was planned.
Not all TG participants were able to submit comments prior to the meeting.
There were a total of 129 comments received, of which 93 were completely
resolved leaving 36 open to be resolved at the next meeting. After resolving
all editorial comments that did not require extensive TG discussion, the
comments were addressed in order of sensitivity or potential controversy that
might be expected. The result is that we should be able to resolve the 36 open
comments at the May meeting. Many of the comments were resolved by a decision
to delete multiple clauses that do not properly belong in 11p as they are a
part of a higher layer standard IEEE P1609. The result of these deletions is
that the 11p document is considerably simplified.
There was one comment regarding the WRSS that will require
additional discussion. A suggested rewording of
this clause will be prepared and a teleconference will be scheduled for
April 6 to discuss the proposed resolution of this comment.
January 2005
Goals for January 2005: Respond
to MAC Address comments, Report
from Ad-Hoc investigation of proposed MAC
Enhancements, Prepare 802.11p amendment
It was verified that there is no problem or conflict with
other aspects of 802.11 if the On-board units (OBUs) periodically changed their
locally administered MAC address
as a means of maintaining anonymity. Determining when and how to effect this
change will be defined in the IEEE P1609.3 standard.
The two MAC
enhancements originally proposed were a Cancel Transmit Primitive and a requirement
that the MAC process only one
packet at a time. The ad-hoc group met with teleconference on November 30 and
were able to recommend that the Cancel Transmit Primitive would be useful and
should be included in 11p, but that the one packet at a time requirement was
not necessary and should not be considered. During the January 11p meeting, the
TG decided to accept the ad-hoc group's recommendation.
A draft amendment was presented and is available on the web
site. There were a number of initial comments that require TG discussion and
approval (non-editorial). These were presented to the TG, discussed, and
recommended modifications to the draft were identified for many of these. For
those comments or open issues that could not be resolved during the meeting, an
action item list was prepared that identifies individuals responsible for
providing inputs to the editor and a schedule for completion of the revised
draft in advance of the March meeting. The editor will post the revised draft
at least one week before the next meeting and notify all TG members when this
is done.
November 2004
Goals for November 2004: Prepare
802.11p amendment
The editor was provided with specific input and requests for
changes to the sample document that was presented at the meeting. The resulting
document will then be posted as the 11p draft.
During the meeting, a proposal was made for two enhancements
to the MAC. These are a Cancel
Transmit Primitive and a requirement that the MAC
process only one packet at a time. Discussion on this proposal indicated that
additional investigation would be required. An ad-hoc group was created to
complete this investigation and report back to the TG. A motion was approved
that the WG permitting meetings of this ad-hoc group before the January
meeting.
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