altai certification training wifi network optimization

Altai Super WiFi

Not for Distribution – Altai Confidential

Altai Super WiFi


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Altai Certification Training

WiFi Network OptimizationProfessional Services

Altai Technologies Limited

Altai Super WiFi


Altai Super WiFi


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Module Outline

• Problem • Coverage • Channel Usage and Capacity• Noise and interference

Altai Super WiFi


Altai Super WiFi


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Customer complain item

• No coverage• Cannot connect• Low Throughput • Easily to lose the connection

Altai Super WiFi


Altai Super WiFi


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Reason

• Coverage issue• Channel Usage and Capacity• Noise or interference

Altai Super WiFi


Altai Super WiFi


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Coverage

Altai Super WiFi


Altai Super WiFi


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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

Altai Super WiFi


Altai Super WiFi


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AP MCS Statistic (Good)

Altai Super WiFi


Altai Super WiFi


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MCS Throughput Table

Altai Super WiFi


Altai Super WiFi


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AP MCS Statistic (Bad)

Altai Super WiFi


Altai Super WiFi


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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

Altai Super WiFi


Altai Super WiFi


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Adjust antenna tilt• Increase antenna down tilt to focus on the nearby region and

coverage.

• Scenario 1 (h =500m)Original down tile = 500m, h = 80mq = 9 d = 500m, d1 = 290m, d2 = 1,479m

Increase down tilt to 15d = 298m, d1 = 198m, d2 = 500m

h

d

=9

d1

d2

Altai Super WiFi


Altai Super WiFi


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Adjust antenna tilt• Increase antenna down tilt to focus on the nearby region and

coverage.

• Scenario 1 (h =500m)Original down tile = 500m, h = 80mq = 9 d = 500m, d1 = 290m, d2 = 1,479m

Increase down tilt to 15d = 298m, d1 = 198m, d2 = 500m

h

d

15

d1

d2

Altai Super WiFi


Altai Super WiFi


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Coverage mapping result

Coveragehole

Altai Super WiFi


Altai Super WiFi


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C1n back to back diagram

A8n/A8-Ein

C1n CPE C1n AP

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.

Altai Super WiFi


Altai Super WiFi


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C1n-C1n corner shopEnhance coverage

C1 AP

C1 CPE

Connect with A8Ein in tower

http://www.altaitechnologies.com/C1_CPE.php

Altai Super WiFi


Altai Super WiFi


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New A8Ein vs C1n CPE-C1n AP

New site configuration Adding new A8Ein C1n CPE -C1n APCoverage Large Medium (Stree level)Increase total network capacity Yes No Remote AWMS management Yes Yes

Site requirementHigh (Rooftop or

tower)Low (Corner shop or

lamp post)Backhaul Yes No Power requirement Yes YesHardware cost Normal LowInstallation cost Normal Low

Altai Super WiFi


Altai Super WiFi


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Channel Usage and Capacity

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Altai Super WiFi


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Channel Usage from A8Ein

Tx + Rx < Busy %The other AP and client occupy part of radio air time

Altai Super WiFi


Altai Super WiFi


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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

Altai Super WiFi


Altai Super WiFi


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Channel Usage

Solution- Change the frequency- Adjust antenna direction, tilt or height to

limit the exposure of antenna from of AP traffic

Altai Super WiFi


Altai Super WiFi


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Frequency Scanning Result

Altai Super WiFi


Altai Super WiFi


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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

Altai Super WiFi


Altai Super WiFi


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500m

35mOverload Existing A8Ein

200m

25m New A8Ein to focus on smaller area to absorb traffic

Adding new A8Ein in same tower

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Altai Super WiFi


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Noise and Interference

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Altai Super WiFi


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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)

Altai Super WiFi


Altai Super WiFi


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Noise Level

Noise level is available from A8Ein Web GUI or AWMS.

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Altai Super WiFi


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Frequency Scan

Frequency scan to retune the frequency

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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.

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Altai Super WiFi


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Normal 802.11n spectrum

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Altai Super WiFi


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Spectrum for audio video transmitter

3 peaks narrow band signal. Constant transmitting.

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Altai Super WiFi


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Spectrum for microwave oven

Very wide band and mountain shape. Continue for a few minutes.

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Altai Super WiFi


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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

Altai Super WiFi


Altai Super WiFi


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A2 and PTP link optimization

Altai Super WiFi


Altai Super WiFi


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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

Altai Super WiFi


Altai Super WiFi


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Thank You

Altai Super WiFi


Altai Super WiFi


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QPSK and Phase relationship

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Altai Super WiFi


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BPSK 16QAM

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Altai Super WiFi


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Bit rate for modulation

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Altai Super WiFi


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Altai A8Ein and C1n Rx Sensitivity

2.4 GHz MCS Data rate Throughput A8n Rx Sensitivity C1n Rx Sensitivity

11b 1 0.7 -95 -962 1.2 -94 -95

5.5 3 -92 -9411 5 -90 -91

11g 6 2 -93 -949 3 -93 -94

12 4 -93 -9418 7 -92 -9324 9 -89 -9036 13 -85 -8748 18 -81 -8354 20 -80 -81

11b/g/n, 0 (BPSK ½) 7 4 -94 -94HT20, 1 (QPSK ½) 14 9 -93 -93SGI 2 (QPSK ¾) 22 13 -90 -91

3 (16QAM ½) 29 17 -87 -884 (16 QAM ¾) 43 26 -84 -855 (64QAM ½) 58 35 -81 -816 (64QAM ¾) 65 39 -79 -79

7 (64 QAM 5/6) 72 43 -77 -778 (BPSK ½) 14 9 -91 -939 (QPSK ½) 29 17 -90 -91

10 (QPSK ¾) 43 26 -88 -8811 (16QAM ½) 58 35 -84 -8512 (16 QAM ¾) 87 52 -81 -8213 (64QAM ½) 116 69 -78 -7814 (64QAM ¾) 130 78 -76 -7615(64 QAM 5/6) 144 87 -74 -75

Higher the data rate,Higher RX sensitivity

Altai Super WiFi


Altai Super WiFi


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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)

• MetaGeek Chanalzer– For locating interference, very rare to use in

real operation

altai certification training wifi network optimization

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