Project: IEEE P802.15 Interest Group for Wireless Personal Area Networks (WPANs) Submission Title: The Mobility Support in Optical V2X System using Rolling Shutter Camera Date Submitted: March 2019 Source: Minh Duc Thieu, Huy Nguyen, Yeong Min Jang [Kookmin University]. Contact: +82-2-910-5068 E-Mail: yjang@kookmin.ac.kr Re: Abstract: Summary considerations of the mobility support in optical V2X system Purpose: To discuss about the need for mobility support in optical V2X system 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.

March 2017 The Mobility Support in Optical V2X System using Rolling Shutter Camera Submission

Introduction The requirement of high mobility support is critical for V2V/V2I communication. This is one of the most challenging tasks in vehicular OCC system. Deviation sampling time is one of the problem caused by rolling effect of rolling shutter camera.

The mobility support in optical V2X (1) The sampling time deviation Δt can be calculated by equation: where Npixel is the number of different pixel rows of light sources captured in the same image at different time, and Fs is the sampling rate of the rolling shutter camera.

The mobility support in optical V2X (2) An illustration of sampling time deviation problem

The mobility support in optical V2X (3) The number of pixels moved in the image depends on the focal length of camera. It can be calculated following the equation: 𝑑[𝑚 𝐻_𝐿𝐸𝐷[𝑚 = 𝑓[𝑚𝑚 ℎ_𝐿𝐸𝐷[𝑚𝑚 Where d is work distance, f is focal length, H_LED and h_LED are height of the LED in reality and in image, respectively.