May, 2005

Brethour, Time DomainSlide 1

doc.: IEEE 802.15-05-0319-00-004a

Submission

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: [(256) 922-0387], E-Mail: [vern.brethour@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.

May, 2005

Brethour, Time DomainSlide 2

doc.: IEEE 802.15-05-0319-00-004a

Submission

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.

May, 2005

Brethour, Time DomainSlide 3

doc.: IEEE 802.15-05-0319-00-004a

Submission

Device A Device B

Two equations in two unknowns yield:

* US Naval Observatory, Telstar Satellite, circa 1962http://www.boulder.nist.gov/timefreq/time/twoway.htmUnmatched detect-delays in the two devices may require one-time offset calibration.

ptUnknown propagation delay

poATBR ttTT 11

Unknown clock offset0t

Message 1Message 2

BRBTATARp TTTTt 121221

poBTAR ttTT 22

ATARBRBTo TTTTt 121221

Multiple measurements of tp and to yield finer precision & accuracy, and allow frequency offset correction.

Ranging Protocols: We want them All !!!

Key:Sync PulseLocation PulseTDOA backhaul

Mode 2 - Active

controller

reference node

SOI

Key:Sync PulseLocation PulsePosition Report

Mode 1 - Passive

controller

reference node

SOI

Two way Ranging

One way SOI does Tx One way SOI does Rx

May, 2005

Brethour, Time DomainSlide 4

doc.: IEEE 802.15-05-0319-00-004a

Submission

We have general consensus favoring use of a Homogenous Preamble for Acquisition and Ranging.

Data (to include the time stamp of when the delimiter was at the antenna of the transmitter.

Homogeneous preamble signal

Homogeneous preamble signal

Homogeneous preamble signal

4 ms50 meter ranging

500 us 20 meter Ranging75 meter communications

50 us 30 meter communications

May, 2005

Brethour, Time DomainSlide 5

doc.: IEEE 802.15-05-0319-00-004a

Submission

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

May, 2005

Brethour, Time DomainSlide 6

doc.: IEEE 802.15-05-0319-00-004a

Submission

15.4a Classes of Service(Not just about Ranging anymore)

Coherent receiver

Non-Coherent receiver

Ranging to 25CM @ 50 m

Not appropriate for communications

Ranging to 25CM @ 20 m

Communications to 75 meters

Not appropriate for Ranging ?

Communications to 30 meters

Ranging to 1M @ 10 m

communications to 30 m

Not appropriate for Ranging

communications to 10 m

Not appropriate for Ranging

Not appropriate for communications ?

Short preambleLong preamble Medium preamble(4ms nominal) (500us nominal) (50us nominal)

May, 2005

Brethour, Time DomainSlide 7

doc.: IEEE 802.15-05-0319-00-004a

Submission

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.

May, 2005

Brethour, Time DomainSlide 8

doc.: IEEE 802.15-05-0319-00-004a

Submission

Remaining work:

• For ranging, it’s the signaling strategy in the homogenous header.

• For general UWB, it’s the bandplan together with the signaling.

May, 2005

Brethour, Time DomainSlide 9

doc.: IEEE 802.15-05-0319-00-004a

Submission

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?

1. 802.15.4a will support 3 ranging protocols (slide 3).

2. 802.15.4a will use a homogenous preamble to support both acquisition and ranging (slide 4).

3. 802.15.4a will use 3 preamble lengths. The word “nominal” was added to qualify the time lengths (slide 4).

4. With 3 preamble lengths and 2 receiver types, 802.15.4a will support 6 classes of service (slide 6).

5. 802.15.4a signaling and bandplan will support at least 6 SOPs (slide 7).