ATMA: Advertisement-based TDMA Protocol for Bursty Traffic in Wireless Sensor Networks

1. ATMA: Advertisement-based TDMA Protocol for Bursty Traffic in Wireless Sensor Networks Surjya Ray, Illker Demirkol, and Wendi Heinzeleman University of Rochester IEEE GLOBECOM 2010

2. Outline • Introduction • Advertisement-based TDMA (ATAM) • Simulations • Conclusion

3. Introduction • Energy conservation is one of the primary goal for wireless sensor networks(WSNs). • The major cause of energy wasting is idle listening.

4. Introduction • TDMA – based • High energy efficient • Need Synchronization • Not easy dynamically change the frame length • Contention – based • S-MAC • T-MAC

5. Introduction • S-MAC • T-MAC

6. T-MAC • Activation event • The reception of any data on the radio • The sensing of communicational on the radio • The knowledge, through overhearing prior RTS and CTS packets, that a data exchange of a neighbor has ended

7. Introduction • T-MAC still waste energy • Idle listening • Advertisement-based TDMA (ATMA) • Variable traffic loading • Reduce Idle listening

8. ATMA • Overview SYNC Advertisement Period Data Period Frame length

9. The Advertisement Period • Divided into many small slots • All nodes are awaked A-Ack S R Sensor ID and data slots ADV Advertisement Period

10. The Advertisement Period Initial Slot Selection: D S R F C S, E D D F F Actual Contention: E A-Ack A-Ack ADV ADV ADV

11. The Data Period • Divided into slots • All nodes will sleep until • Sending • Receiving Data Period ACK DATA S R

12. The Data Period • Sender can reserve n data slots Data Period S R ACK ACK DATA DATA

13. Simulations

14. Simulations • Single hop • 20 nodes and area size : 50*50m

15. Simulations • Multi-hop • 312 nodes and area size is 700*700m

16. Conclusion • The simulation results shows that ATAM outsperforms than other related works. • In the future, the authors will plan an analytical model for the ATMA and to optimize the length for the ATMA period of ATMA.