A Study of Data Dissemination on Vehicular Ad Hoc Networks using IEEE802.11p Communication System Final Report Passakon Prathombutr, Ph.D NECTEC Kultida Rojviboonchai, Ph.D. Kulit Na Nakorn, Ph.D. Kiattikun Kawila ISEL, Department of Computer Engineering, Chulalongkorn University

System Architecture Device Installation Environment Detail Study Results Example Cases Unexpected Issues

Application : displays information to passenger System Architecture Application : displays information to passenger Wi-Fi Hotspot : connects IEEE802.11p to Wi-Fi standards IEEE802.11p : bus-to-bus and bus-to-bus stop comm. GPS, Traffic Status, … Intelligent Bus Stop IEEE802.11p Communication Device Wifi Hotspot Bus Passenger

System Architecture IEEE802.11P Communication Device (Bus/Bus Stop) Smartphone (Passenger) Application Application Reliable Broadcast Prot. (API) Reliable Broadcast Prot. (API) App Wi-Fi Wi-Fi 802.11P Wi-Fi 802.11P

System Architecture Access Point Raspberry Pi + Sensors Ethernet Switch DENSO WSU-5001T Voltage Step Down Circuit

Device Installation : Buses IEEE802.11p Antenna GPS Antenna IEEE802.11P Device

Device Installation : Pictures Buses

Device Installation : Base Station IEEE802.11p Antenna GPS Antenna 1 IEEE802.11P Device Battery Position of base stations on the covered walkway Position of base stations on the map

Device Installation : Pictures Base Station Device Box Battery Box

Environment Detail System Architecture Device Installation Study Results Example Cases Unexpected Issues

1 2 4 Environment Detail : Bus Routes and Base Stations Buses Line 1 : 6 Buses 2 Line 2 : 5 Buses 4 Line 4 : 4 Buses Base Stations 2 Base Stations

Broadcasting Protocol: DECA DECA performs periodic beaconing to gather local density information of 1-hop neighbors. A node selects a neighbor with highest density. Selected node is responsible for rebroadcasting the message immediately.

Environment Detail : Message Configuration Sending Interval Every 1 Minute Message Lifetime 30 Minutes Message Size 512 bytes Message Header Source IP (4 bytes) Msg ID (4 bytes) GPS (16 bytes) Timestamp (8 bytes) Payload (512 bytes)

Study Results System Architecture Device Installation Environment Detail Study Results Example Cases Unexpected Issues

Study Results: Online Activity Ratio Tue 3 Nov 2015 Install devices Mon 9 Nov 2015 Install more devices Online Activity Ratio Tue 10 Nov 2015 Add fuse

Study Results: Online Activity Ratio Wed 11 Nov 2015 Unplug devices to check power problem Thu 13 Nov 2015 Install more devices without being connected to power Online Activity Ratio Fri 19 Nov 2015 Fix AC power problem: Add Diode

Study Results: Online Activity Ratio Fri 20 Nov 2015 Sat 21 Nov 2015 Online Activity Ratio Mon 23 Nov 2015 Fix file format issue: Change format from FAT32 to EXT4

Study Results: Online Activity Ratio Tuesday 24 November 2015 Online Activity Ratio

Study Results: Packet Delivery Ratio *Packet Delivery Ratio = Packet Sent / Packet Received Packet Delivery Ratio Date

Study Results: Packet Delivery Ratio Mon 23 Nov 2015 07:05 – 07:35 AM Packet Delivery Ratio Tue24 Nov 2015 06:55 – 07:25 AM Shuttle Bus ID

Study Results: Transmission Delay Transmission Delay (Sec) Number of hops (Number of Rebroadcast events)

Example Cases System Architecture Device Installation Environment Detail Study Results Example Cases Unexpected Issues

Sample Log of Bus 85

Example Cases: Log Field Extraction Send Data Timestamp Flag Latitude Longitude Source IP Seq # Selected IP 7:05:18 AM SendData 13.735795 100.531882 192.168.2.85 735 192.168.2.83 Receive Data Timestamp Flag Latitude Longitude Source IP Seq # 7:05:18 AM RecvData 13.735795 100.531882 192.168.2.76 735 Rebroadcast Data Timestamp Flag Latitude Longitude Source IP Seq # Selected IP 7:05:19 AM RebcData 13.73504 100.531815 192.168.2.83 735 192.168.2.76 *Selected IP = Node/Bus that is responsible for rebroadcasting the message immediately. *Seq = Sequence Number to track the same packet/message

Example Cases: Broadcasting Data At 07:05 AM 7:05:18 AM SendData 13.735795 100.531882 192.168.2.85 735 192.168.2.83 7:05:18 AM RecvData 13.735795 100.531882 192.168.2.76 735 7:05:18 AM RecvData 13.735795 100.531882 192.168.2.83 735 7:05:19 AM RebcData 13.73504 100.531815 192.168.2.83 735 192.168.2.76 7:05:19 AM RecvData 13.735013 100.531803 192.168.2.85 735 7:05:19 AM RecvData 13.735795 100.531882 192.168.2.76 735

Example Cases: Broadcasting Data At 07:10 AM 7:10:13 AM RebcData 13.734835 100.531665 192.168.2.76 735 192.168.2.90 7:10:14 AM RecvData 13.737768 100.533072 192.168.2.90 735 7:10:14 AM RebcData 13.738745 100.52977 192.168.2.90 735 192.168.2.79 7:10:44 AM RebcData 13.739233 100.534725 192.168.2.85 735 192.168.2.89 7:10:44 AM RecvData 13.74045 100.530008 192.168.2.89 735 7:10:44 AM RebcData 13.740453 100.530012 192.168.2.89 735 192.168.2.85 7:10:45 AM RecvData 13.73923279 100.5347249 192.168.2.85 735

Example Cases: Broadcasting Data At 07:30 AM – 07:35 AM 7:30:03 AM RebcData 13.745528 100.535245 192.168.2.76 735 192.168.2.80 7:30:04 AM RecvData 13.74084 100.527497 192.168.2.80 735 7:30:27 AM RebcData 13.74341 100.530313 192.168.2.83 735 192.168.2.81 7:30:29 AM RecvData 13.738468 100.529595 192.168.2.81 735 7:35:01 AM RebcData 13.73823 100.527807 192.168.2.90 735 192.168.2.79 7:35:01 AM RecvData 13.736575 100.524988 192.168.2.80 735 7:35:01 AM RecvData 13.736552 100.525252 192.168.2.79 735 7:35:02 AM RebcData 13.736575 100.524988 192.168.2.79 735 192.168.2.80 ......

Unexpected Issues System Architecture Device Installation Environment Detail Study Results Example Cases Unexpected Issues

Unexpected Issues New electrical system of CU shuttle bus AC leaking in main power line damages the voltage step down circuit. Heavy rain causes water leaking and double-side tape degeneration

Unexpected Issues File format issue and read only problem FAT32 EXT4 DENSO WSU-5001-T Red light notification – not boot

Project Presentation at NBTC

Pictures

Summary Data can be delivered up to 83.93%. Results were gathered from 10 buses and 1 RSU. Maximum number of online buses was 9 buses.

Future Work Problem: Solution: There are 5 WSUs that do not work properly. Solution: Recover 5 WSUs using the DENSO firmware Deploy 4 WSUs on 4 buses Deploy 1 WSUs as 1 RSU Performance Measurement & Evaluation

Our Team NECTEC Passakon Prathombutr, Ph.D Information System Engineering Lab (ISEL), Department of Computer Engineering, Chulalongkorn University Kultida Rojviboonchai, Ph.D. Kulit Na Nakorn, Ph.D. Kiattikun Kawila Tanapoom Danmanee Nattakan Pramuanyat Pakawat Chumcharoen Tanapat Ruengsatra Adsadawut Chanakitkarnchok