1. CLA-MAC: A Cooperative Extension of Load Adaptive MAC Protocol Howard Huang Homayoun Yousefi’zadeh Hamid Jafarkhani Center for Pervasive Communications and Computing University of California, Irvine [hthuang, hyousefi, hamidj]@uci.edu IEEE MilCom 2011

2. OUTLINE INTRODUCTION RELATED WORK CLA-MAC EXPERIMENTAL RESULTS CONCLUSION

3. INTRODUCTION Cooperative communications techniques has proven to significantly improve network performance

4. INTRODUCTION S S A A B B D D

5. S S A A B B D D RTS CTS

6. INTRODUCTION S S A A B B D D

7. RELATED WORK LA-MAC ▫HYBRID  CSMA  TDMA W. Hu, X. Li, and H. Yousefi’zadeh, “LA-MAC: A load adaptive MAC protocol for MANETs,” in Proc. 2009 IEEE GLOBECOM, Honolulu, HI, Nov.- Dec. 2009.

8. RELATED WORK LA-MAC ▫TDMA W. Hu, X. Li, and H. Yousefi’zadeh, “LA-MAC: A load adaptive MAC protocol for MANETs,” in Proc. 2009 IEEE GLOBECOM, Honolulu, HI, Nov.- Dec. 2009. A A B B C C D D

9. RELATED WORK LA-MAC ▫CSMA W. Hu, X. Li, and H. Yousefi’zadeh, “LA-MAC: A load adaptive MAC protocol for MANETs,” in Proc. 2009 IEEE GLOBECOM, Honolulu, HI, Nov.- Dec. 2009. A A C C

10. RELATED WORK LA-MAC ▫CSMA W. Hu, X. Li, and H. Yousefi’zadeh, “LA-MAC: A load adaptive MAC protocol for MANETs,” in Proc. 2009 IEEE GLOBECOM, Honolulu, HI, Nov.- Dec. 2009. A A C C A A RTSRTS CTSCTS DATA A A RTSRTS CTSCTS

11. CLA-MAC Cooperative LA-MAC ▫Goal  Hybrid model  Receiver-Base

12. CLA-MAC Initialization Phase MAC addresstimestampChannel quality

13. CLA-MAC S S A A B B D D RTSCTS S S

14. CLA-MAC

15. S S A A B B D D

16. S S A A B B D D h i = 9h i = 5 Relay request NACK Relay request

17. EXPERIMENTAL RESULTS ParameterValue The size of region/m500*500 Communication radius/m40 Transmit16-QAM The number of packets 500

18. EXPERIMENTAL RESULTS

20. CONCLUSION we designed a Cooperative MAC protocol CLA- MAC as an extension of our previously introduced LA-MAC protocol