1. doc.: IEEE 802.15-09-0204-00-0007 Submission March 2009 R. Roberts (Intel), T. Matsumura (VLCC)Slide 1 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: A standardized LED infrastructure lighting interface Date Submitted: March 2009 Source: Rick Roberts, Intel Corp., richard.d.roberts@intel.com Tom Matsumura, VLCC, tom@naka-lab.jp Re: Abstract: Purpose: 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.

2. doc.: IEEE 802.15-09-0204-00-0007 Submission March 2009 R. Roberts (Intel), T. Matsumura (VLCC)Slide 2 PHY MAC LLC 802.15.7 PAR Authorization Consider the logical partitioning of the IEEE802 lower protocol stack

3. doc.: IEEE 802.15-09-0204-00-0007 Submission March 2009 R. Roberts (Intel), T. Matsumura (VLCC)Slide 3 Now consider the hardware partitioning against the protocol stack for LED infrastructure lighting. LED Light Panel Upper PHY (FEC, etc.) PHY Layer MAC The PHY layer is split between the upper PHY (FEC, etc.) - which is supplied by the VLC vendor – and the lower PHY which is the LED light panel, which may NOT be supplied by the VLC vendor. The standard specifies the air interface at the transmission source. This includes the LED light source.

4. doc.: IEEE 802.15-09-0204-00-0007 Submission March 2009 R. Roberts (Intel), T. Matsumura (VLCC)Slide 4 The splitting of the PHY layer proposes a potential problem for the infrastructure VLC model: 1.Existing LED lighting will have to be retrofitted to support VLC. 2.Ideally, new LED lighting would be manufactured with an VLC interface in place. 3.So what assumptions should 802.15.7 make about the light panel interface? What kind of modulation will be supported at the light panel? OOK? PWM? OFDM? At what data rate? What about dimmers? 4.What we need is a functional interface specification to the light panel. But how do we get that?

5. doc.: IEEE 802.15-09-0204-00-0007 Submission March 2009 R. Roberts (Intel), T. Matsumura (VLCC)Slide 5 It could be a two part process for infrastructure lighting … Part 1: specification of MAC and Upper PHY by 802.15.7 Part 2: specification of the Lower PHY interface by ???? So the question is … 1.Do other folks agree this is a problem? 2.Do folks agree the solution is out-of-scope of 802.15.7 but nevertheless needs to be addressed?

6. doc.: IEEE 802.15-09-0204-00-0007 Submission March 2009 R. Roberts (Intel), T. Matsumura (VLCC)Slide 6 … and the LED lighting installation clock is ticking. LED lighting that is installed without a VLC interface will require TBD modifications to accommodate VLC. And LED lighting lasts a long time. It could be years before the next generation of LED lighting is installed due to product churn.