Re: [802SEC] +++10 Day EC Email Ballot (Closes no later than 29 April 2007)+++ Motion to approve the formation of the 802.11 Video Transport Stream (VTS) Study Group
Approve
> -----Original Message-----
> From: ***** IEEE 802 Executive Committee List ***** [mailto:STDS-802-
> SEC@ieee.org] On Behalf Of Stuart J. Kerry
> Sent: Wednesday, April 18, 2007 11:10 AM
> To: STDS-802-SEC@listserv.ieee.org
> Subject: [802SEC] +++10 Day EC Email Ballot (Closes no later than 29
April
> 2007)+++ Motion to approve the formation of the 802.11 Video Transport
> Stream (VTS) Study Group
>
>
>
> Dear EC Members,
>
>
>
> The 802 EC Chair has delegated me to conduct this EC ballot on his
behalf.
>
> This is a 10 day email ballot to make a determination on the withdrawn
> motion which was deferred to an 802 EC email ballot, that was
submitted to
> the Closing Orlando March 2007 802 EC meeting:
>
>
>
> Motion: "To approve formation of an IEEE 802.11 Study Group to
examine
> issues related to delivery of Video Transport Streams (VTS) over IEEE
> P802.11, with the intent to create a PAR and Five criteria to form a
new
> Task Group. The proposed PAR and 5C would be reviewed by the 802.1
Audio
> Video Bridging Task Group (802.1AVB TG), and in addition both the
802.1AVB
> TG and 802.11 VTS SG (and eventually the 802.11 TG, if formed) will
meet
> jointly at IEEE 802 plenary meetings, unless mutually agreed not to".
>
> Moved: Stuart J. Kerry
>
> Seconded: Tony Jeffree
>
> This ballot opens 11:59 PM ET Wednesday 18th, 2007 and closes when all
> voting EC members have cast a ballot but no later than 11:59 PM ET
Sunday
> April 29th, 2007 if enough ballots have been cast for a decision to be
> made
> (more than 9 approves or disapproves).
>
>
>
> Executive Summary:
>
>
>
> The proposed 802.11 Video Transport Stream (VTS) Study Group will
focus on
> enhancements within the 802.11 MAC/PHY layers to improve video
streaming
> performance over 802.11 links. The problem space is constrained to be
> limited to issues unique to 802.11 and nothing more.
>
>
>
> The 802.11 VTS SG will collaborate with 802.1AVB TG to ascertain that
> 802.11
> specifications include support for all mechanisms specified in
802.1AVB.
> If
> there are no mechanisms within 802.11 to support 802.1AVB, the 802.11
VTS
> SG
> will work jointly with 802.1AVB TG to specify the required mechanisms.
> This
> strategy is decided based on discussions with Michael Johas Teener
> (802.1AVB
> TG Chair) and Ganesh Venkatesan (Proposed Chair of the 802.11 VTS SG,
if
> approved), as well as the two WG Chairs.
>
>
>
> If the 802.11 VTS SG formation is approved by the EC, the tentative
> schedule
> for 802.11 VTS SG in May interim meeting in Montreal includes a
> presentation
> on 802.1AVB and 802.1AVB Transport Protocol followed by a discussion
how
> 802.11 fits into this specification. These meetings are open to all
802
> members.
>
> Approved in 802.11 WG:
>
> . 802.11 WNG SC - Results: 59-3-11
>
> . WG - Results: 76-1-25
>
>
>
>
>
> Details:
>
>
>
> 802.11 VTS SG is focused on enhancements within the 802.11 MAC/PHY
layers
> to
> improve the performance of video streams sent over 802.11 links. This
is
> the
> main focus of the 802.11 VTS SG and is expected that the SG will spend
80%
> of its time in this activity. Some of the areas for study are (not in
any
> specific order, not a complete list). Some of these topics are not
fully
> explored yet:
>
>
>
> 1. Enhancements to 802.11e mechanisms to render them effective for
> transport streams (not all bits are equal
>
> 2. QoS Management mechanisms (permits QoS control from higher
layers)
>
> 3. Optimizations to make medium access more deterministic
>
> 4. Forward Error Correction techniques that are effective for
802.11
> (specifically low reliability of the medium)
>
> 5. Resiliency mechanisms to mitigate interference
>
> 6. Heuristics for retransmission, packet drop, etc
>
> 7. Channel dynamics estimation and adaptation techniques
>
>
> In addition (if there are currently no known mechanisms in 802.11) the
VTS
> SG, in order to guarantee that the wired and wireless sub-systems can
> co-exist, will also work on the following items listed below. It is
> anticipated that the items in this list will involve some level of
joint
> activity between 802.1AVB TG and 802.11 VTS SG. About 20% of the
802.11
> VTS
> SG activity is expected here. Please note that the items listed below
will
> be in 802.11 (if needed) but will be performed jointly with the
experts
> from
> 802.1AVB TG.
>
>
>
> . Mechanisms to support those specified by 802.1 Qat (stream
> reservation protocol - bandwidth, latency, Admission Control and Time
> Synchronization) and 802.1Qav (forwarding and queuing of
time-sensitive
> streams). Note that support for 802.1AS is already included in
802.11v.
>
> . Mechanisms to support 802.1Qas (time synchronization).
>
> . Any additional mechanisms that are specified in 802.1AVB
> requiring
> additional support in 802.11.
>
> A liaison will be established between 802.1AVB TG and 802.11 VTS SG.
The
> liaison will ascertain 802.1 AVB mechanisms and optimizations in
802.11
> for
> video streaming are compatible and they work together to improve
streaming
> performance. This will be a 2-way communication - advancements in
802.1AVB
> will be made known to the 802.11 VTS SG members and advancements made
in
> the
> SG made known to 802.1AVB TG members.
>
>
>
> . The documents generated by the two groups may be reviewed by
> each
> other (on a case by case basis),
>
> . There may be presentations from one group to the other to
> provide
> rationale/motivation for an approach/solution and
>
> . Members from each group will attend meetings of the other
when
> possible.
>
>
>
> Regards,
>
> / Stuart
>
> _______________________________
>
> Stuart J. Kerry
> Chair, IEEE 802.11 WLANs WG
>
> c/o: NXP Semiconductors,
> 1109 McKay Drive, M/S 48A SJ,
> San Jose, CA 95131-1706,
> United States of America.
>
> +1 (408) 474-7356 - Phone
> +1 (408) 474-5343 - Fax
> +1 (408) 348-3171 - Cell
> eMail: <mailto:stuart@ok-brit.com> stuart@ok-brit.com
> _______________________________
>
>
>
>
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