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.
Regards,
Tony
At 19:10 18/04/2007, Stuart J. Kerry wrote:
>
>
>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This is a 10 day email ballot to make a determination on the withdrawn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
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>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:
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>
>
>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:
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>. 802.11 WNG SC - Results: 59-3-11
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>. WG - Results: 76-1-25
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>Details:
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>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:
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>
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>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)
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>5. Resiliency mechanisms to mitigate interference
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>6. Heuristics for retransmission, packet drop, etc
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>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).
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>. 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),
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>. 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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>
>
>
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