1. 2/24/2019
doc.: IEEE /1158r0
January 2006
Adjacent Channel Interference Metric for OTA Indoor LOS Test Environment
Date: January 2006
Authors:
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Neeraj Sharma, Intel
Lemberger Uriel, Intel

2. 2/24/2019
doc.: IEEE /1158r0
January 2006
Abstract
This document introduces Adjacent Channel Interference (ACI) metric and measurement methodology for OTA Indoor LOS Test Environment as part of Recommended Practice for the Evaluation of Wireless Performance
This presentations corresponds to the document /0087r0-ACI-Metric-for-OTA-Indoor-LOS-Test.doc and it uses the OTA Indoor LOS test environment described in IEEE P /D0.5 draft
Neeraj Sharma, Intel
Lemberger Uriel, Intel

3. Agenda Purpose Test Equipment Typical setup Test Methodology
2/24/2019
doc.: IEEE /1158r0
January 2006
Agenda
Purpose
Test Equipment
Typical setup
Test Methodology
Test procedure
Test Reporting
Test Examples
Neeraj Sharma, Intel
Lemberger Uriel, Intel

4. Purpose of OTA Indoor LOS ACI Testing
January 2006
Purpose of OTA Indoor LOS ACI Testing
The Adjacent Channel Interference (ACI) or adjacent channel noise rejection test is intended to depict expected throughput performance when another device is nearby on an adjacent/non-overlapping channel
Motivation:
ACI not uncommon in a conference room, adjacent cubes in enterprise, etc. where there are multiple APs and clients in close proximity associated to different APs (due to distance, load balancing)
Can be used to validate conductive ACI tests
Neeraj Sharma, Intel

5. Motivation
January 2006
ACI not uncommon in a conference room, adjacent cubes in enterprise, etc. where there are multiple APs and clients in close proximity associated to different APs (due to distance, load balancing)
Can be used to validate conductive ACI tests
Neeraj Sharma, Intel

6. January 2006
Test Equipment
A wireless counterpart (WLCP/AP). The DUT should be capable of associating with the WLCP
AP_Jammer, an AP used for generating interference
Client_Jammer, a STA used for generating interference. The Client_Jammer should be capable of associating with the AP_Jammer
Test controllers/Traffic Generators with following capabilities:
The ability to transfer 1MB file between WLCP and the DUT and between AP_Jammer and the Client_Jammer above the MAC layer
The ability to control time/duration of file transfer between the WLCP and the DUT and between AP_Jammer and the Client_Jammer
Rolling carts of appropriate height to move/place the DUT and Client_Jammer
Inclinometer or other angle measurement device, and/or a test jig to fix the antenna angle of the DUT and Client_Jammer with antennae in the lid/LCD
Spectrum analyzer to monitor noise level
Neeraj Sharma, Intel

7. Test Environment Setup
January 2006
Test Environment Setup
The test uses OTA Indoor LOS test environment [P D0.5 section 5.6]
The setup should be properly isolated from external interference and other unwanted signals
In-band noise ≤ -100dBm from any (other than test equipment) or non source over the range
All test software should be verified
Neeraj Sharma, Intel

8. ACI Measurement Setup for OTA Indoor LOS
January 2006
ACI Measurement Setup for OTA Indoor LOS
AP_Jammer
Test Station Cart
Spectrum Analyzer
Test Controller/Traffic Generator
Distance Between DUT and Client_Jammer
WLCP
Client_Jammer
DUT
Distance Between WLCP
and DUT
Distance Between
Test Stand or wall/ceiling
1200
Neeraj Sharma, Intel

9. Test Setup Parameters Distances: DUT and Client_Jammer Position:
2/24/2019
doc.: IEEE /1158r0
January 2006
Test Setup Parameters
Distances:
Between WLCP and DUT = 20 meters ± 1cm
Between Client_Jammer and AP_Jammer = 20 meters ± 1cm
Distance Between DUT and Client_Jammer = 1, 2, and 3 meters ± 1cm
DUT and Client_Jammer Position:
DUT and Client_Jammer placed back-to-back for laptop
Remaining Test Parameters are same as specified in Clause 5.6 of the P /D0.5
Neeraj Sharma, Intel
Lemberger Uriel, Intel

10. Configuration Setup Parameters
2/24/2019
doc.: IEEE /1158r0
January 2006
Configuration Setup Parameters
Maximum transmit power setting for DUT, WLCP, Client_Jammer, and AP_Jammer
Both the DUT and Client_Jammer in adjacent/non-overlapping channels in a-only, b-only, or g-only modes:
For b/g mode, DUT/WLCP and Client_Jammer/AP_Jammer channel setup are 1 and 6, respectively, or 2 other channels with offset of 25MHz
For a mode, DUT/WLCP and Client_Jammer/AP_Jammer channel setup are 48 and 52, respectively, or 2 other channels with offset of 20MHz
The actual channel selection should be recorded
No security (Open System)
DUT and Client_Jammer on AC power with all power saving features disabled
Neeraj Sharma, Intel
Lemberger Uriel, Intel

11. January 2006
Test Methodology
The DUT’s OTA throughput is measured for one minute without interference, two minutes with interference, and a final one minute without interference
The reason to measure the DUT’s throughput performance during the final one minute without interference is to account for throughput impact due to the possible DUT’s graceful rate scaling recovery after the interference
In the ideal case, the DUT’s throughput performance is unaffected by the interference from neighboring device
Neeraj Sharma, Intel

12. January 2006
Procedure
Measure DUT’s throughput for one minute without interference
Measure DUT’s throughput for two minutes with interference
Calculate DUT’s % Throughput Degradation
1 min
2 min
3 min
4 min
Time
Client_Jammer/AP_Jammer Active Period
DUT/WLCP Active Period
Quiet Run-up Period
Interference Period
Quiet Run-down Period
Neeraj Sharma, Intel

13. January 2006
Procedure - details
Setup DUT/WLCP and Client_Jammer/AP_Jammer on appropriate adjacent non-overlapping channels for a/b/g mode
Associate DUT with WLCP
Enforce DUT to Tx/Rx 1MB file for 4 minutes (DUT using auto rate negotiation)
Measure DUT’s throughput and record
After 1 minute, associate Client_Jammer with AP_Jammer
Enforce Client_Jammer to Tx/Rx 1MB file for 2 minutes
Measure Client_Jammer’s throughput and record
After 2 minutes, turn off Client_Jammer and AP_Jammer
Neeraj Sharma, Intel

14. Procedure – details (cont’d)
January 2006
Procedure – details (cont’d)
Repeat above steps with DUT and Client_Jammer in the following Tx/Rx modes of file transfer:
DUT Client_Jammer
Tx Tx
Tx Rx
Rx Tx
Rx Rx
Calculate DUT’s % throughput degradation
Repeat above steps with different combinations of channels and modes for the DUT and Client_Jammer
Neeraj Sharma, Intel

15. Reporting January 2006 The following data should be reported:
2/24/2019
doc.: IEEE /1158r0
January 2006
Reporting
The following data should be reported:
Noise level
Ambient Temperature
Relative humidity
Details of Client_Jammer and AP_Jammer e.g. manufacturer, model, etc.
The results should be reported as a table
Mode
DUT Channel
Client_Jammer Channel
DUT Tx/Rx
Client_Jammer Tx/Rx
DUT’s Average Throughput during Quiet Run-up Period (Mbps)
DUT’s Average, Minimum, and Maximum Throughput during Interference Period (Mbps)
Client_Jammer’s Average Throughput during Interference Period
(Mbps)
DUT’s Average Throughput during Quiet Run-down Period
DUT’s % Throughput Degradation
The details of the test results could also be included in a graphical format
Graphs show DUT’s and Client_Jammer’s throughput over a period of 4 and 2 minutes, respectively, for different modes, channels, and Tx/Rx combinations
Neeraj Sharma, Intel
Lemberger Uriel, Intel

16. Example of Reporting - Table
January 2006
Example of Reporting - Table
Mode
DUT Channel
Client_Jammer Channel
DUT Rx/Tx
Client_Jammer Rx/Tx
DUT’s Average Throughput during Quiet Run-up Period (Mbps)
DUT’s Average, Minimum, and Maximum Throughput during Interference Period (Mbps)
Client_Jammer’s Average Throughput during Interference
(Mbps)
DUT’s Average Throughput during Quiet Run-down Period
DUT’s % Throughput Degradation
802.11g 1 6 Tx
Avg: 21.14
Avg: 13.16
Min: 8.16
Max: 21.80
Avg: 10.10
Avg: 20.90
37% Rx
Avg: 21.19
Avg: 20.46
Min: 18.90
Max: 21.70
Avg: 3.40
Avg: 20.93
2.8%
Avg: 21.30
Avg: 5.61
Min: 4.40
Max: 23.70
Avg: 14.80
75%
Avg: 22.52
Avg: 20.29
Max: 23.60
Avg: 6.70
Avg: 22.60
10%
Neeraj Sharma, Intel

17. Example of Detailed Reporting - Graphs
January 2006
Example of Detailed Reporting - Graphs
DUT’s Throughput
Client_Jammer’s Throughput
DUT in Rx mode and Client_Jammer in Rx mode
Client_Jammer’s Throughput
DUT in Rx mode and Client_Jammer in Tx mode
DUT’s Throughput
Neeraj Sharma, Intel

18. Example of Detailed Reporting - Graphs
January 2006
Example of Detailed Reporting - Graphs
DUT’s Throughput
DUT in Tx mode and Client_Jammer in Rx mode
Client_Jammer’s Throughput
DUT’s Throughput
DUT in Tx mode and Client_Jammer in Tx mode
Client_Jammer’s Throughput
Neeraj Sharma, Intel

19. OTA Indoor LOS ACI Test Modifiers
January 2006
OTA Indoor LOS ACI Test Modifiers
Fixed Tx/Rx data rates for the DUT and Client_Jammer
Power saving mode
Other operating channels in a-only, b-only, or g-only modes
Mixed mode where the DUT is in g mode while Client_Jammer is in b mode or vice versa
Neeraj Sharma, Intel

20. January 2006
Conclusions
Presented ACI metric and methodology for OTA indoor LOS test environment
The test metric uses a test environment that has been defined in the draft
Presented some examples on result reporting
Recommendation:
Recommend TGT to adopt the content of document 11-06/0087r0 into the IEEE P /D0.5 draft
Neeraj Sharma, Intel

21. References [1] IEEE 802.11-1999 [2] IEEE P802.11.2/D0.5 January 2006
Neeraj Sharma, Intel