March 2009 Project: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs) Submission Title: VLC – Application Category Terms & Mobility Date Submitted: March 2009 Source: Larry Taylor, DTC (UK) 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. Larry Taylor (DTC (UK)

Terminology Infrastructure Fixed Portable Mobile Vehicle Larry Taylor (DTC (UK)

Mobility There are two types of mobility Physical Mobility affects Logical Mobility Physical Mobility affects PHY MAC (Possibly) Logical Mobility affects MAC Larry Taylor (DTC (UK)

Physical Mobility The VLC device changes physical position Moves within the coverage area PHY conditions may change Link quality Interference Path loss etc. No Link Change (I1, M1) Larry Taylor (DTC (UK)

Logical Mobility Device changes neighbourhood Change may be due to Link moves from (I2, M1) To (I3, M1) Change may be due to PHY effects e.g. interference MAC control e.g. Channel Change Larry Taylor (DTC (UK)

Portable Case No Operation while moving Link changes (I1, M1) (I4, M1) Consider device to be inactive except when links are established Similar to Fixed case Note implementation issues for Fixed & Portable will be different See Notes on slide 9 Larry Taylor (DTC (UK)

Physical & Logical Mobility Device moves while communicating Physical position changes PHY link may change Link changes from (I1, M1) To (I2, M1) (I3, M1) (I4, M1) Larry Taylor (DTC (UK)

The Vehicle Cases Infrastructure & moving vehicle Point-to-Point Physical & Logical Mobility Link Changes (I1, V1) .. (I4, V1) Point-to-Point Physical Mobility No Link Change (V1, V2) Larry Taylor (DTC (UK)

Notes Portable If the device actively monitors its neighbourhood (e.g. auto-discovery) the device may appear to be mobile at the MAC layer even if the application is not operating The Mobile – Portable difference is more grey than black & white Mobile Depending on the architecture of the infrastructure, the device may have two (or more) active links as part of the mobility function Detailed technical discussion is needed on issues such as Make-before-break Terminal initiated handoff Network initiated handoff Etc. The network architecture will be significantly different for point-to-point links and multiple access Larry Taylor (DTC (UK)