doc.: ieee 802.11-06/0132r1 submission march 2006 dr. michael d. foegelle, ets-lindgrenslide 1...
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Doc.: IEEE /0132r1 Submission March 2006 Dr. Michael D. Foegelle, ETS-LindgrenSlide 3 Overview Introduction to Proposal Traceable OTA Test Environment Traceable OTA Test Method Motion ReferencesTRANSCRIPT
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 1
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Performance Testing Presentation
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Date: 2006-3-08
Name Company Address Phone email Dr. Michael D. Foegelle ETS-Lindgren 1301 Arrow Point Drive
Cedar Park, TX 78613 (512) 531-6444 [email protected]
Authors:
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 2
Doc.: IEEE 802.11-06/0132r1
Submission
Abstract
This presentation summarizes the draft submission 802.11-06/0131r0 on Traceable OTA Performance Testing.
The draft submission introduces the test environment and metrics necessary for traceable over-the-air performance testing of the wireless radios in 802.11 devices.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 3
Doc.: IEEE 802.11-06/0132r1
Submission
Overview
• Introduction to Proposal• Traceable OTA Test Environment• Traceable OTA Test Method• Motion• References
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 4
Doc.: IEEE 802.11-06/0132r1
Submission
Introduction to Proposal
• The contents of this submission have been presented and reviewed over the past year and a half and include information from contributions:– IEEE 802.11-04/0674r1, “Passive Antenna
Measurements vs. Over-The-Air Active Measurements and Associated Metrics for Wi-Fi Testing”
– IEEE 802.11-05/0943r0, “Conducted Power and Sensitivity Measurements”
– IEEE 802.11-05/0944r0, “OTA TRP and TIS Testing”
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 5
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Test EnvironmentIntroduction and Purpose
• Describes the test system required for performing traceable over-the-air RF performance tests on 802.11 DUTs.
• Specifies system components and associated measurement quality.
• Addresses combined radio and antenna related performance of single DUTs– in free-space – in free-space with near-field loading – with other impairments
• Introduces bulk performance metrics total radiated power (TRP) and total isotropic sensitivity (TIS) and related metrics.
• Traceable nature of measurements allows comparison of DUTs tested in different systems to within a known level of measurement uncertainty.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 6
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Test EnvironmentConfiguration
• Defines test system consisting of:– Fully anechoic chamber for isolation and free-space environment– Multi-axis positioning system for spherical pattern measurement.– Dual polarized measurement antenna.– Traceable RF test equipment for measuring power and sensitivity
of DUT (based on conducted test methods).– Near field phantoms for different physical use cases.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 7
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Test EnvironmentConfiguration
• Defines environmental parameters/characteristics including:– Spherical coordinate system and polarization definitions.– Specifies far field conditions and range length issues.– Defines the quiet zone and references various site validation
methodologies.– Provides methodology for range calibration.
• Note: This section is part of training documentation I’ve written in the past. Portions of this section were submitted to the CTIA and published verbatim as part of their OTA test plan, but rights to distribute original content were maintained. Can pursue official release from CTIA if needed.
– Various other uncertainty contributions and points of concern.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 8
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Test EnvironmentApproach
• Defines basic physical configuration for free-space measurements of DUT.– Orientation with respect to positioner/coordinate system.– Orientation of moveable antenna elements.– Routing of cables, etc.– References conducted tests for other DUT parameters.
• Defines variants of test configuration including:– Use of near field phantoms (head, hands, tabletops, walls)– Alternate antenna orientations.– Alternate cable orientations.– Impairment with other radios active (converged devices)
• Defines variants of test conditions including angular step size and sensitivity search algorithm.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 9
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Test MethodSpecification of Metrics
• Defines single point metrics:– Effective Isotropic Radiated Power (EIRP)– Effective Isotropic Sensitivity (EIS)
• Defines integrated (total) surface metrics:– Total Radiated Power (TRP)– Total Isotropic Sensitivity (TIS)
• Defines ratio metrics:– Directivity– Front to back ratio– Gain– Efficiency
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 10
Doc.: IEEE 802.11-06/0132r1
Submission
Traceable OTA Test MethodProcedure & Results
• Defines step by step procedure for measuring pattern data using conical cut method (north to south pole).
• Specifies recommended output information.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 11
Doc.: IEEE 802.11-06/0132r1
Submission
Need for these metrics
• There are over 70 OTA test labs installed worldwide.• Many of these have customers or are owned by
manufacturers who wish to perform TRP and TIS testing of 802.11 devices.
• To ensure the traceability of results between labs, it is not enough to use traceable test equipment; they must also follow equivalent test procedures.
• Standards already exist for other wireless technologies.• This proposal mirrors those procedures for 802.11.• Per the PAR, 802.11.2 was intended to provide this type
of standardization for these labs.• The methodology proposed here belongs in 802.11.2.
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 12
Doc.: IEEE 802.11-06/0132r1
Submission
Motion
• Move to adopt the contents of document 11-06/0131r1 into the P802.11.2 draft.– Moved:– Second:– Yes/No/Abstain:
• Motion is technical (75% to pass)
March 2006
Dr. Michael D. Foegelle, ETS-Lindgren
Slide 13
Doc.: IEEE 802.11-06/0132r1
Submission
References
• 1. IEEE 802.11-06/0131r1, “Traceable OTA Performance Testing Proposal,” M.D. Foegelle.