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Relay Selection for Cooperative MAC Considering Retransmission Overhead

Relay Selection for Cooperative MAC Considering Retransmission Overhead. Bin Cao, Gang Feng, Yun Li University of Electronic Science and Technology of China Chongqing University of Post and Telecommunications IEEE Globecom 2011. Outline. Introduction Goals Problem Description

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Relay Selection for Cooperative MAC Considering Retransmission Overhead

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  1. Relay Selection for Cooperative MAC Considering Retransmission Overhead Bin Cao, Gang Feng, Yun Li University of Electronic Science and Technology of China Chongqing University of Post and Telecommunications IEEE Globecom 2011

  2. Outline Introduction Goals Problem Description Cooperative MAC Mechanism Relay Selection in Cooperative MAC Simulation Conclusion

  3. Introduction • The cooperative communication approach effective uses of spatial diversity in wireless ad hoc networks • Improved throughput • Delay performance C B A

  4. Introduction • Previous papers have not taken into account MAC overhead caused by retransmission due to impaired wireless channel • MAC overhead is incurred by • Failure of contending • Transmission error

  5. Related Work Its performance deteriorates under fading conditions due to lower direct path or relay path reliability CoopMACI

  6. Goals • We address the issue of Relay Selection • MAC overhead is taken into account • A good tradeoff between transmission delay and error probability • Achieve a better performance gain

  7. Problem Description SNR The Bit Error Rate of direct mode and cooperation mode Frame Loss Probability The throughput for direct and cooperative communications Frame Transmission Time

  8. Cooperative MAC Mechanism C-RTS DATA S SIFS SIFS SIFS SIFS SIFS C-CTS ACK D DATA RTR R

  9. Relay Selectionin CooperativeMAC FTT in direct communication mode FTTin cooperative communication mode

  10. Relay Selectionin CooperativeMAC Frame Error Ratio Bit Error Rate • Frame Loss Probability for direct communications

  11. Relay Selectionin CooperativeMAC • Frame Loss Probability for cooperative communications

  12. Simulation Simulation parameters

  13. Simulation

  14. Simulation

  15. Conclusion • Our proposed cooperative MAC • Canselect the mostsuitable node as a relay • Alleviates the retransmission probability • Enhances thecooperation opportunity.

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