1. Wireless Audio Conferencing System (WACS) Mehmet Ali Abbasoğlu Furkan Çimen Aylin Deveci Kübra Gümüş

2. Project Description  Wireless Ad-Hoc Network communication in wider area by hopping from node to node  Multiple users will be able to talk simultaneously without needing an access point and Internet

3. Software Requirements  Functional Requirements See all connected users to WLAN Send request -> Accept / Reject  Non-Functional Requirements For fluid conversation, fast&efficient voice transfer Full-duplex-> speak&heard at the same time

4. Technologies Used  Hardware Technologies Laptop with 802.11b Wireless technology Microphone & speaker  Software Technologies Eclipse IDE Netbeans Java Media Framework (JMF) library

5. Java Media Framework (JMF)  Enables audio, video and other time-based media to be added to applications and applets built on Java technology.  Capture, playback, stream, and transcode multiple media formats, extends the Java 2 Platform, Standard Edition (J2SE) for multimedia developers by providing a powerful toolkit to develop scalable, cross- platform technology.

6. Real-time Transport Protocol (RTP )  RTP is an end to end transport layer protocol intended for transmitting real- time data such as audio and video.  RTP has a companion protocol called RTP Control Protocol ( RTCP) whose role is to monitor the quality of data delivery offered by the RTP.

7. Why we used RTP?  TCP is not an appropriate choice for carrying real-time multimedia contents Multimedia contents do not demand the 100% reliability Overhead introduced by TCP causes large amount of delay in receiving the data and makes the application less interactive  UDP is also unsuitable for multimedia transmission UDP does not guarantee ordered delivery of packets

8. The networking protocol stack with JMF RTP API

9. Viewing online users  Address Resolution Protocol (ARP) determining a network host's link layer or hardware address when only its Internet Layer (IP) or Network Layer address is known. uses a simple message format that contains one address resolution request or response Once local network recognized, the server or networking device returns a response containing the required address.

10. Executing MS DOS commands in Java  Pushing MS DOS command from Java arp –a  Displays the internet address and physical address (MAC) of all the network adapters Reading online ip by creating process.

11. Multi-hop Communication  Optimized Link State Routing Protocol (OLSR) is an IP routing protocol optimized for mobile ad-hoc networks  Individual nodes use this topology information to compute next hop destinations for all nodes in the network using shortest hop forwarding paths

12. OLSRD ()  An adhoc wireless mesh routing daemon  To be enable to use this protocol installed OLSRD 0.6.0

13. DEMO

14. Thank You for Your Listening Any Questions?