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Impact of network configuration on Quality of Experience in WLAN networks ?

Impact of network configuration on Quality of Experience in WLAN networks ?. Date: 2013-07-15. Authors:. Abstract. This is background submission for 802.11HEW SG in Genova July 15 th -19 th

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Impact of network configuration on Quality of Experience in WLAN networks ?

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  1. Impact of network configuration on Quality of Experience in WLAN networks ? Date: 2013-07-15 Authors: Veli-Pekka Ketonen (7signal Solutions)

  2. Abstract This is background submission for 802.11HEW SG in Genova July 15th-19th This material includes data from Avans University of Applied Sciences WLAN network in learning centre area. This material is based on a the optimization report submitted to Avans University Purpose of this submission is to share information on current WLAN performance and show how significant impact network configuration has on the actual Quality of Experience network provides for end users Veli-Pekka Ketonen (7signal Solutions)

  3. The key message • In order to provide significant gains in end user experienced quality of experience in WLAN, the fundamental requirements of wireless networking should not be overlooked • Networks implemented with the current technologies carry significantly higher performance potential than many networks are currently delivering • Introducing new and faster technologies may similarly fail to provide targeted performance if sufficient capabilities are not in place to • Configure radio environment and networks for best performance • Allow network engineers maintain this state under continuously varying conditions and requirements Veli-PekkaKetonen (7signal Solutions)

  4. Avans University of Applied Sciences Optimization report June 20, 2013 Veli-PekkaKetonen (7signal Solutions)

  5. Background • Avans University of Applied Sciences Learning Center Network optimization was performed for two floors • Areas were covered with two Sapphire Eye units • Number of users in network reduces over the period • Lectures ended June 7th, however exams continued during the optimization work • Covered area is Learning center, so students remained there as active users • Data volumes in the covered area remained even or even increased slightly despite lower number of users • This report outlines the overall results in both areas and bands on daily level. There are hourly and AP level dynamics that are not presented in detail here. • Each daily result point includes significant amount of data. • Separate detailed reports are available for each phase. Veli-PekkaKetonen (7signal Solutions)

  6. Optimization flow Implemented changes • Change 1, May 29th • 4-channel plan on 2.4 GHz (Learning Center floors 0, 1, 2) • Change 2, June 3rd • Beacon interval from 100ms to 300ms • Remove 802.11b support and disable MCS 0, 8 and 16 • Change 3, June 6th • Adjust AP radio power levels • Change 4, June 11th • Complete campus 4-channel plan on 2.4 GHz • Add more channels on 5 GHz (Learning Center) • Change 5, June 16th • At 5 GHz, turn on HT40+ • At 2.4 GHz Balance client counts by adjusting AP power level settings Veli-PekkaKetonen (7signal Solutions)

  7. Managed Access Points on Learning Center2.4 GHz Channels • AP000621 • - AP000627 • - AP000631 • - AP000633 • - AP001076 • - AP001077 #9 #5 #5 #13 #1 #1 - AP000632 - AP000636 - AP001078 - AP001080 - AP001094 #5 #13 #1 #13 #9 Ground Floor 1st Floor Veli-PekkaKetonen (7signal Solutions)

  8. 2.4 GHz OVERALL results Veli-PekkaKetonen (7signal Solutions)

  9. Radio attach success rate 1 2 3 4 5 Some APs refused connections, rebooted Performance remained roughly on the same level Note: 7signal limits attach time to 30s. If attach is not completed during that time, it is recoded as failure in metrics. End user may get connected by waiting longer. Veli-PekkaKetonen (7signal Solutions)

  10. FTP (TCP) downlink throughput ~ 40% improvement 1 2 3 4 5 40% improvement in ground floor, from about 21 Mbit/s to 30 Mbit/s Veli-PekkaKetonen (7signal Solutions)

  11. FTP (TCP) downlink throughput, hourly 1 2 3 4 5 Clear improvement. The last change negative Clear improvement in the lowest hourly values The last change impacts negatively and need to be revisited Veli-PekkaKetonen (7signal Solutions)

  12. FTP (TCP) uplink throughput ~ 40% improvement 1 2 3 4 5 40% improvement in ground floor, from about 22 Mbit/s to 30 Mbit/s Veli-PekkaKetonen (7signal Solutions)

  13. FTP (TCP) uplink throughput, hourly 1 2 3 4 5 Clear improvement. The last change negative Clear improvement in the lowest hourly values The last change impacts negatively and need to be revisited Veli-PekkaKetonen (7signal Solutions)

  14. HTTP downlink throughput ~ 25% improvement 1 2 3 4 5 About 25% improvement Veli-PekkaKetonen (7signal Solutions)

  15. Voice Quality (MOS), downlink 1 2 3 4 5 Some improvement over the period Veli-PekkaKetonen (7signal Solutions)

  16. Voice Quality (MOS), downlink, hourly 1 2 3 4 5 Some improvement in the lowest hourly values The last change impacts negatively and need to be revisited Veli-PekkaKetonen (7signal Solutions)

  17. Voice Quality (MOS), uplink 1 2 3 4 5 Some improvement over the period Veli-PekkaKetonen (7signal Solutions)

  18. Voice Quality (MOS), uplink, hourly 1 2 3 4 5 No clear change Veli-PekkaKetonen (7signal Solutions)

  19. Jitter 1 2 3 4 5 ~ 40% improvement Last change in floor 1 had negative impact A clear improvement Veli-PekkaKetonen (7signal Solutions)

  20. Packet loss 1 2 3 4 5 80% reduction, from 1.5% to 0.3% 80% reduction in level (1.5% to 0.3%) Veli-PekkaKetonen (7signal Solutions)

  21. Network latency (Ping RTT) Negative impact with the last changes on averages 1 2 3 4 5 50% improvement 50% improvement in the ground floor from 7.25ms to 3.5ms, The last change has some what negative impact in 1st floor Veli-PekkaKetonen (7signal Solutions)

  22. Ping success rate 1 2 3 4 5 Some improvement Veli-PekkaKetonen (7signal Solutions)

  23. Retransmissions in tests by Eye sensor 1 2 3 4 5 50% improvement Negative impact with the last change 50% improvement in ground floor 10% improvement in 1st floor Veli-PekkaKetonen (7signal Solutions)

  24. Retransmission by AP towards clients 1 2 3 4 5 45% improvement 45% improvement in ground floor Veli-PekkaKetonen (7signal Solutions)

  25. Retransmission by AP towards clients 1 2 3 4 5 Target is below 10% High peak hour values remain Veli-PekkaKetonen (7signal Solutions)

  26. Retransmissions by Clients toward AP 1 2 3 4 5 Improvement in both areas Veli-PekkaKetonen (7signal Solutions)

  27. Retransmissions by Clients toward AP 1 2 3 4 5 Target is below 10% High peak hour values remain Veli-PekkaKetonen (7signal Solutions)

  28. Beacon airtime utilization 1 2 3 4 5 Significant positive impact Significant impact in both areas Veli-PekkaKetonen (7signal Solutions)

  29. WLAN traffic airtime utilization 1 2 3 4 5 In ground floor 55% reduction Empty network during weekends 55% reduction in ground floor, a clear improvement in 1st floor too 90% lower WLAN utilization in empty network Veli-PekkaKetonen (7signal Solutions)

  30. Management traffic density from AP 1 2 3 4 5 Significant positive impact Veli-PekkaKetonen (7signal Solutions)

  31. Aggregate traffic density towards AP 1 2 3 4 5 Frame density lowers Veli-PekkaKetonen (7signal Solutions)

  32. Aggregate traffic density towards AP 1 2 3 4 5 Frame density lowers Veli-PekkaKetonen (7signal Solutions)

  33. Uplink payload data volume 1 2 3 4 5 Payload volume varies quite a bit between days May have increased. Short baseline time makes assessment a bit inaccurate Veli-PekkaKetonen (7signal Solutions)

  34. Downlink payload data volume 1 2 3 4 5 Payload volume varies quite a bit between days May have increased. Short baseline time makes assessment a bit inaccurate Veli-PekkaKetonen (7signal Solutions)

  35. Number of clients/AP 1 2 3 4 5 Client count lowers over the period At the same time traffic volume seem to hold up Veli-PekkaKetonen (7signal Solutions)

  36. 5 GHz overall results Veli-PekkaKetonen (7signal Solutions)

  37. Radio attach success rate 1 2 3 4 5 From 40% to >90% Significant improvement Note: 7signal limits attach time to 30s. If attach is not completed during that time, it is recoded as failure in metrics. End user may get connected by waiting longer. Veli-PekkaKetonen (7signal Solutions)

  38. FTP (TCP) downlink throughput 270% improvement in 1st floor 1 1 2 2 3 3 4 4 5 5 70% improvement in ground floor Significant improvements, 70-270% Veli-PekkaKetonen (7signal Solutions)

  39. FTP (TCP) downlink throughput, hourly 900% improvement in 1st floor 1 1 2 2 3 3 4 4 5 5 100% improvement in ground floor Significant improvements Veli-PekkaKetonen (7signal Solutions)

  40. FTP (TCP) uplink throughput 700% improvement in 1st floor 1 2 3 4 5 85% improvement in ground floor Significant improvements, 85-700% Veli-PekkaKetonen (7signal Solutions)

  41. FTP (TCP) uplink throughput, hourly 1 1 2 2 3 3 4 4 5 5 900% improvement in 1st floor 100% improvement in ground floor Significant improvements Veli-PekkaKetonen (7signal Solutions)

  42. HTTP downlink throughput 1 2 3 4 5 90%/50% improvements >90% in 1st floor floor and 50% in ground floor Veli-PekkaKetonen (7signal Solutions)

  43. Voice Quality (MOS), downlink 1 2 3 4 5 Improving Veli-PekkaKetonen (7signal Solutions)

  44. Voice Quality (MOS), downlink, hourly +0.25MOS in ground +0.25MOS in 1st floor 1 2 3 4 5 Clearly improving Veli-PekkaKetonen (7signal Solutions)

  45. Voice Quality (MOS), uplink 1 2 3 4 5 Improving Veli-PekkaKetonen (7signal Solutions)

  46. Voice Quality (MOS), uplink, hourly +0.15MOS in ground +0.8MOS in 1st floor 1 2 3 4 5 No drops Clearly improving Veli-PekkaKetonen (7signal Solutions)

  47. Jitter 1 2 3 4 5 Looks great all the time Veli-PekkaKetonen (7signal Solutions)

  48. Packet loss 1 2 3 4 5 Improved Veli-PekkaKetonen (7signal Solutions)

  49. Network latency (RTT) 1 2 3 4 5 50% improvement in 1st floor 50% improvement in the 1st floor 25% improvement in ground floor Veli-PekkaKetonen (7signal Solutions)

  50. Ping success rate From 85% to 99% in 1st floor 1 2 3 4 5 Significant improvement in the 1st floor Veli-PekkaKetonen (7signal Solutions)

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