IEEE 802'15 subject

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Project IEEE P802.15 Working Group for Wireless
Personal Area Networks (WPANs) Submission Title
Adopted Proposals from May 18,2005 TG4a
AM1 Date Submitted 24 May, 2005 Source
Vern Brethour Company Time Domain
Corp. Address 7057 Old Madison Pike Suite 250
Huntsville, Alabama 35806 USA Voice(256)
428-6331, FAX [phone], E-Mail
vern.brethour_at_timedomain.com Re 802.15
4a. Abstract Classes of service, Ranging
protocols and SOP targets for 802.15.4a Purpose
To document the proposals adopted in the
session. Notice This document has been
prepared to assist the IEEE P802.15. It is
offered as a basis for discussion and is not
binding on the contributing individual(s) or
organization(s). The material in this document is
subject to change in form and content after
further study. The contributor(s) reserve(s) the
right to add, amend or withdraw material
contained herein. Release The contributor
acknowledges and accepts that this contribution
becomes the property of IEEE and may be made
publicly available by P802.15.
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This is after-the-fact documentation of the
adopted items in the Cairns May 18-AM1 session.

• The bandwidth and document server support was so
  horrible in Cairns that it was not possible to
  post this during the meeting. The next 6 slides
  which follow this cover slide are exactly the
  slides projected on the screen at the Wednesday
  May 18, 2005 AM1 session. The proposals on these
  slides were adopted by unanimous consent.
  Immediately after adoption in Cairns, the
  original .ppt file was transferred to the laptops
  of the sectary and the chair by thumb drive for
  incorporation into the minutes. However, in the
  first draft of the minutes, MS_word mangled the
  incorporation of the slides. The original slides
  are presented here in their native .ppt format.

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Ranging Protocols We want them All !!!
Two way Ranging
One way SOI does Tx
One way SOI does Rx
4
We have general consensus favoring use of a
Homogenous Preamble for Acquisition and Ranging.
Homogeneous preamble signal
4 ms 50 meter ranging
Data (to include the time stamp of when the
delimiter was at the antenna of the transmitter.
Homogeneous preamble signal
500 us 20 meter Ranging 75 meter communications
Homogeneous preamble signal
50 us 30 meter communications
5
Sharing (Ranging and Communications) the same
Preamble leads us to a unified notion of
Classes of Service

• We can express this newer construct using the
  Classification based on index parameters
  similar to the way Yihong Qi organized IEEE
  15-05-0275-00-004a

6
15.4a Classes of Service(Not just about Ranging
anymore)
Long preamble
Short preamble
Medium preamble
(4ms nominal)
(500us nominal)
(50us nominal)
Coherent receiver
Non-Coherent receiver
7
Overlaying the performance targets for distance
and resolution, we have SOP targets.

• Informal discussions are leaning toward
  supporting 6 SOPs.
• That is achievable as 2 code isolated piconets in
  each of 3 frequency isolated bands.
• More would be great, but this seems like a
  reasonable target.

8
Remaining work

• For ranging, its the signaling strategy in the
  homogenous header.
• For general UWB, its the bandplan together with
  the signaling.

9
Summary Slide for this submission (This slide
was added after the fact not shown in Cairns)

• What exactly did we decide on May 18, AM1?
• 802.15.4a will support 3 ranging protocols (slide
  3).
• 802.15.4a will use a homogenous preamble to
  support both acquisition and ranging (slide 4).
• 802.15.4a will use 3 preamble lengths. The word
  nominal was added to qualify the time lengths
  (slide 4).
• With 3 preamble lengths and 2 receiver types,
  802.15.4a will support 6 classes of service
  (slide 6).
• 802.15.4a signaling and bandplan will support at
  least 6 SOPs (slide 7).