1. Positioning Relay of Wirelessly Networked Devices
Members: Mark Buising, Douglas Chow, Nazeni Mktrchyan, Jesus Rodriguez, Jennifer Webb
California State University, Los Angeles
Advisor: Russ Abbott
Sponsored by: The Aerospace Corporation
Liaison: Mahan Hajianpour & Zaven Petrosyan

2. Introduction Objective Scenario:
To implement an Ad-Hoc Wireless Mesh Network
Scenario:
Emergency situations e.g. Earthquakes
No communications infrastructure e.g. Cell service, Internet

3. Ad Hoc Wireless Mesh Network
PROWIND Architecture
User Interface
Mesh Network API
MANET Manager
Android OS
Main Activity
Application
Network Interface
Messaging Service
Messaging Fragment
Network Socket
Ad Hoc Wireless Mesh Network
ManetService
Peer List Fragment
Manet
Connector
Routing Protocol 7
Peer Map Fragment
Routing Table
Settings Fragment
Location Extractor
GPS Listener

4. Connecting a Device into the Wireless Mesh Network
User Interface
Mesh Network API
MANET Manager
Android OS
Main Activity
Application
Network Interface
Messaging Service
Messaging Fragment
Network Socket
Ad Hoc Wireless Mesh Network
ManetService
Peer List Fragment
Manet
Connector
Routing Protocol 4 7 8 7 3 5
Peer Map Fragment 2
Routing Table 6 1
Settings Fragment
Location Extractor
Routing protocol adds the device’s own information to the received “Hello” messages and rebroadcasts them
Routing Protocol passes set of peers to Manet Connector
Routing protocol listens for “Hello” messages from other peers and extracts their information
Manet Connector notifies Peer List and Peer Map to update their views with new peer information
Location Extractor passes GPS coordinates to Manet Connector
Manet Connector passes peer information and GPS coordinates to MANET Manager’s Routing Protocol
Routing Protocol creates “Hello” message and broadcasts to wireless mesh network
Routing Protocol writes routing information in the Android OS IP routing table based on collected peer information
GPS Listener

5. Peer-to-Peer Messaging
User Interface
Mesh Network API
MANET Manager
Android OS
Main Activity
Application
Network Interface
Messaging Service
Messaging Fragment A B
Network Socket D C
Ad Hoc Wireless Mesh Network
ManetService
Peer List Fragment
Manet
Connector
Routing Protocol 7
Peer Map Fragment
Routing Table
Settings Fragment
Location Extractor
Messaging Service notifies Messaging fragment to update its view with new chat messaging queue content
Messaging Service listens for network packets that can be parsed into chat messages and adds them to the messaging queue.
Messaging Service transforms chat message into network packets and sends to destination node using routing information from the Android OS IP Routing table
Messaging Fragment passes a chat message to Messaging Service
GPS Listener

6. Results
Successfully created an ad-hoc/mesh network through MANET Manager
Retrieves location information (longitude and latitude) of each connected device
Displays the connected devices on a map using markers
Allows broadcast and private messaging
Allows user to create personalized messages for quick messaging

7. Future Work & Lessons Learned
Expand to voice/picture/video
messaging through wireless mesh
infrastructure
Security features
Work as a team
Learn together
Communication

8. Questions?