1. AFR partial MAC proposal for IEEE 802.11n
August 2004
AFR partial MAC proposal for IEEE n
Qiang Ni National University of Ireland, Maynooth
Tian-ji Li, Thierry Turletti
INRIA Sophia Antipolis
Yang Xiao University of Memphis, USA
Qiang Ni, et al

2. Outline Ideal throughput analysis for 802.11n
August 2004
Outline
Ideal throughput analysis for n
Actual effective throughput analysis under noisy environments
Our packet Aggregation with Fragment-Retransmission (AFR) proposal
Simulation analysis
Qiang Ni, et al

3. Ideal throughput analysis for 802.11n (1)
August 2004
Ideal throughput analysis for n (1)
MAC: DCF (Distributed Coordination Function)
Ideal throughput:
Throughput Upper Limit (TUL):
Qiang Ni, et al

4. Ideal throughput analysis for 802.11n (2)
August 2004
Ideal throughput analysis for n (2)
Payload size = 1024bytes
Your throughput never higher than 50Mbps with 1Kbyte frame!!
Qiang Ni, et al

5. Ideal throughput analysis for 802.11n (2)
August 2004
Ideal throughput analysis for n (2)
MAC and PHY parameters for a/b/n
Qiang Ni, et al

6. Ideal throughput analysis for 802.11n (3)
August 2004
Ideal throughput analysis for n (3)
Maximum throughput while only one parameter is modified
Qiang Ni, et al

7. Ideal throughput analysis for 802.11n (4)
August 2004
Ideal throughput analysis for n (4)
Maximum throughput while multiple parameters are modified
Qiang Ni, et al

8. Ideal throughput analysis for 802.11n (5)
August 2004
Ideal throughput analysis for n (5)
Maximum throughput of e EDCA burst-ACK scheme
Qiang Ni, et al

9. Ideal throughput analysis for 802.11n (5)
August 2004
Ideal throughput analysis for n (5)
Maximum throughput of a simple packet aggregation
Qiang Ni, et al

10. Actual effective throughput under noisy environments (1)
August 2004
Actual effective throughput under noisy environments (1)
Things are different when we consider noisy channels (errors)
Gaussian channel:
pe , packet error rate (PER), Pb , bit error rate (BER)
Actual effective throughput ( )
Qiang Ni, et al

11. Is simple packet aggregation acceptable??
August 2004
Actual effective throughput under noisy environments (2)
PHY layer peack rate = 216Mbps
Is simple packet aggregation acceptable??
Qiang Ni, et al

12. Aggregation with Fragment-Retransmission (AFR)
August 2004
Our solutions:
Aggregation with Fragment-Retransmission (AFR)
Qiang Ni, et al

13. AFR (1) MAC data frame for the AFR scheme
August 2004
AFR (1)
MAC data frame for the AFR scheme
MAC ACK frame for the AFR scheme
Qiang Ni, et al

14. One example of the AFR protocol
August 2004
AFR (2)
One example of the AFR protocol
Qiang Ni, et al

15. August 2004
Simulation analysis
Qiang Ni, et al