1. September 2009
Project: IEEE P Working Group for Wireless Personal Area Networks (WPANs)
Submission Title: Comments on merged ETRI, Intel, Samsung, CSUS draft
Date Submitted: November 19, 2009
Source: Douglas Castor; Weimin Liu, Samian Kaur [InterDigital Communications, LLC]
Address: 781 Third Ave, King of Prussia, PA 19406
Voice:[ ], FAX: [ ],
Re: Merged ETRI, Intel, Samsung, CSUS draft, document
Abstract: <Scheme in draft does not support increasing brightness within active frame >
Purpose: <Optimize dimming / data rate>
Notice: This document has been prepared to assist the IEEE P 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 P
Doug Castor, InterDigital

2. November 2009
Dimming
From section
** Value depends on modulation: 50% for OOK and Manchester, for example
Scheme cannot support brightness beyond 50%** within active frame
Data modulation cuts brightness in half, adding OFF time further dims
Lighting companies will want full range of dimming supported
Optimal dimming / data rate solution is to pad transmission duration with either ON or OFF, subject to flicker constraints
Idle patterns are used when no data, as shown above
Solution
Allow ON time as well as OFF (dead) time
Compute duration of OFF or ON time as
MAC controls frame type (e.g. Visibility, Data, etc.) and its periodicity and duration based on dimming and flicker constraints
Td is the period of the data frame.
B is the average brightness of the modulation
(e.g. 50% for OOK)
L is the desired brightness given by the
dimmer.
Doug Castor, InterDigital

3. September 2009
Thank You!
Doug Castor, InterDigital