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Altai Certification Training WiFi Network Optimization

Altai Certification Training WiFi Network Optimization. Professional Services Altai Technologies Limited. Module Outline. Problem Coverage Channel Usage and Capacity Noise and interference. Customer complain item. No coverage Cannot connect Low Throughput

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Altai Certification Training WiFi Network Optimization

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  1. Altai Certification TrainingWiFi Network Optimization Professional Services Altai Technologies Limited

  2. Module Outline Problem Coverage Channel Usage and Capacity Noise and interference

  3. Customer complain item No coverage Cannot connect Low Throughput Easily to lose the connection

  4. Reason Coverage issue Channel Usage and Capacity Noise or interference

  5. Coverage

  6. Coverage issue How to find out Coverage mapping (drive test) Customer complain AP MCS statistic Solution Adjust antenna direction, tilt or height to focus on weak coverage location Adding new sites Adding C1n-C1n back to back pair

  7. AP MCS Statistic (Good)

  8. MCS Throughput Table

  9. AP MCS Statistic (Bad)

  10. Coverage issue How to find out Coverage mapping (drive test) Customer complain AP MCS statistic Solution Adjust antenna direction, tilt or height to focus on weak coverage location Adding new sites Adding C1n-C1n back to back pair

  11. Adjust antenna tilt • Increase antenna down tilt to focus on the nearby region and coverage. • Scenario 1 (h =500m) • Original down tile = 500m, h = 80m • = 9  d = 500m, d1 = 290m, d2 = 1,479m • Increase down tilt to 15 • d = 298m, d1 = 198m, d2 = 500m  =9  h d d1 d2

  12. Adjust antenna tilt • Increase antenna down tilt to focus on the nearby region and coverage. • Scenario 1 (h =500m) • Original down tile = 500m, h = 80m • = 9  d = 500m, d1 = 290m, d2 = 1,479m • Increase down tilt to 15 • d = 298m, d1 = 198m, d2 = 500m 15 h d d1 d2

  13. Coverage mapping result Coverage hole

  14. C1nback to back diagram C1n back to back is that one C1n work as CPE (station) mode to connect to the A8n/A8-Ein which maybe far away, then other C1n which will work as AP connect to the C1n CPE via Ethernet cable and PoE adaptor provide the WiFi for the area where the A8n/A8-Ein can not cover. A8n/A8-Ein C1n AP C1n CPE 14

  15. C1n-C1n corner shopEnhance coverage Connect with A8Ein in tower C1 CPE C1 AP

  16. New A8Ein vs C1n CPE-C1n AP

  17. Channel Usage and Capacity

  18. Channel Usage from A8Ein Tx + Rx < Busy % The other AP and client occupy part of radio air time

  19. Channel Usage How to find out From A8Ein Channel Usage Statistic Continuous high channel usage (>90%) leads to low user throughput, high latency. The channel usage is by AP itself or other AP. AP itself -> capacity issue Other AP -> channel usage issue

  20. Channel Usage Solution Change the frequency Adjust antenna direction, tilt or height to limit the exposure of antenna from of AP traffic

  21. Frequency Scanning Result

  22. Capacity Solution Adding new sites Adding new A8Ein in the same site With smaller coverage and focus on high user density area AirFi It will increase the overall base station throughput but not making every client happy

  23. Adding new A8Ein in same tower 35m Overload Existing A8Ein 25m New A8Ein to focus on smaller area to absorb traffic 200m 500m

  24. Noise and Interference

  25. Noise and Interference 2.4GHz is sharing band Noise level increase as number of WiFi AP and client increase. No particular source. Interference is coming from particular source, e.g. high power transmitter (non-standard compliance device)

  26. Noise Level Noise level is available from A8Ein Web GUI or AWMS.

  27. Frequency Scan Frequency scan to retune the frequency

  28. Interference Interference is coming from particular source, e.g. high power transmitter (non-standard compliance device) Interference is very rare case. Nearly all cases in undeveloped countries that many high power non-standard compliance transmitter existed. Need to find out the interference source to eliminate or avoid it. Handheld spectrum analyzer to locate the source.

  29. Normal 802.11n spectrum

  30. Spectrum for audio video transmitter 3 peaks narrow band signal. Constant transmitting.

  31. Spectrum for microwave oven Very wide band and mountain shape. Continue for a few minutes.

  32. Interference - Solutions Illegal transmitter or malfunction transmitter - ask the owner to turn it off and fix it Interference source cannot b eliminated -> avoid it turn AP antenna direction back to the interface source metal grid between AP antenna and interference source Move the antenna sites to other location

  33. A2 and PTP link optimization

  34. A2 PTP Link Status between JAD-0002 and JAD-MCO A2 on JAD-0002 with IP address 10.119.4.103 A2 on JAD-MCO with IP address 10.119.4.124

  35. Thank You

  36. QPSK and Phase relationship

  37. BPSK 16QAM

  38. Bit rate for modulation

  39. Altai A8Ein and C1n Rx Sensitivity Higher the data rate, Higher RX sensitivity

  40. Tools • InSSider – Free, mapping and DL RSSI checking • Fluke AirCheck • General DL RSSI checking • Check DL Noise and SNR • Check channel usage (incl. non-WiFi usage) • MetaGeekChanalzer • For locating interference, very rare to use in real operation

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