altai certification training wifi network optimization
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
1
Altai Certification Training
WiFi Network OptimizationProfessional Services
Altai Technologies Limited
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
2
Module Outline
• Problem • Coverage • Channel Usage and Capacity• Noise and interference
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
3
Customer complain item
• No coverage• Cannot connect• Low Throughput • Easily to lose the connection
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
4
Reason
• Coverage issue• Channel Usage and Capacity• Noise or interference
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
5
Coverage
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
7
AP MCS Statistic (Good)
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
8
MCS Throughput Table
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
9
AP MCS Statistic (Bad)
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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 = 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
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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 = 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
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
13
Coverage mapping result
Coveragehole
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
1414
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
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
15
C1n-C1n corner shopEnhance coverage
C1 AP
C1 CPE
Connect with A8Ein in tower
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
16
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
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
17
Channel Usage and Capacity
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
18
Channel Usage from A8Ein
Tx + Rx < Busy %The other AP and client occupy part of radio air time
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
20
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
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
21
Frequency Scanning Result
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
23
500m
35mOverload Existing A8Ein
200m
25m New A8Ein to focus on smaller area to absorb traffic
Adding new A8Ein in same tower
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
24
Noise and Interference
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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)
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
26
Noise Level
Noise level is available from A8Ein Web GUI or AWMS.
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
27
Frequency Scan
Frequency scan to retune the frequency
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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.
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
29
Normal 802.11n spectrum
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
30
Spectrum for audio video transmitter
3 peaks narrow band signal. Constant transmitting.
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
31
Spectrum for microwave oven
Very wide band and mountain shape. Continue for a few minutes.
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
33
A2 and PTP link optimization
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
35
Thank You
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
36
QPSK and Phase relationship
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
37
BPSK 16QAM
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
38
Bit rate for modulation
Altai Super WiFi
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
39
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
Not for Distribution – Altai Confidential
Altai Super WiFi
Not for Distribution – Altai Confidential
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)
• MetaGeek Chanalzer– For locating interference, very rare to use in
real operation