C63.27-2017 - American National Standard for Evaluation of Wireless Coexistence

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Posted on May 15, 2017 at 7:30 AM

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The new approved standard C63.27-2017 provides an evaluation process and supporting test methods for quantifying the ability of a wireless device to coexist with other wireless services in its intended radio frequency environments.

The standard specifies:

• methods for assessing the radio frequency (RF) wireless coexistence of equipment.
• key performance indicators (KPIs) used to assess ability of the EUT to coexist with other equipment in its intended operational environment.

Traditional EMC vs Coexistence:

• Traditional EMC testing is designed to exclude frequency bands where the device under test communicates wirelessly.
• Coexistence testing examines performance in frequency bands where the device uses wireless communication.

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High-level process flow for coexistence testing:

Develop Test Plan

• Identify the intended EM environment
• Specify the FWP (functional wireless performance) of the EUT
• Specify the evaluation tier to be used for assessing the FWP
• Choose a test method
• Specify the intended signal
• Specify the unintended signals

Perform Testing

• Verify the test setup
• Baseline the FWP of the EUT in the test environment
• Baseline the performance of the unintended signals in the test environment
• Test the FWP of the EUT in the presence of the unintended signals

Analysis of Results

• Likelihood of coexistence (LoC), an estimation of the EUT’s ability to provide its FWP in the intended use environment.
• Medical device risk

Analysis of Uncertainties

All uncertainty calculations and estimates shall follow the guidance of ISO/IEC guide 98-1 or JCGM 104:2009 and ISO/IEC 98-3 or JCGM 100:2008 (including ISO/IEC 98-3 Supplement 1 and ISO/IEC 98-3 Supplement 2 or JCGM 101:2008 and JCGM 102:2011). * (ANSI 63.27-2017 page 36)

The complete standard can be found here.