WINNF-17-R-00145 - OET Lab Report Comments - Test Harness Compliance Questions

Sep 2, 2026

Document text consists of detailed reviewer comments on verification and compliance requirements described in an OET Lab Report tied to CBSD operation with Spectrum Access Systems (SAS). It questions how CBSDs should demonstrate access, connection, registration, and required capabilities using an SAS test harness versus an actual SAS, and requests clarifications on minimum transmission power, continuous transmission needs, geo-location accuracy, and two-way operability. It also discusses how management software functions and how PAL/GAA authorization status is determined and reported.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages8

Reading Time20 min

AccessFree to download

CBSD verification and SAS access requirements

Connection and interaction with SAS

Registration information and information visibility

Required device capabilities (a–e) and clarifications

Transmission and RF behavior requirements

Output power variation and maximum/minimum levels

Continuous modulated signal operation needs

Management software and authorization status handling

Data collection role of SAS harness vs proxy

PAL/GAA determination logic

Geo-location and operability accuracy requirements

Location accuracy and update timing

Two-way communication across assigned channels

Footnote-level operational questions

| Page | Text / area within OET Lab Report | Comment / Discussion | | --- | --- | --- | | 2 | ,CBSDs are required to demonstrate the capability to access at least one Spectrum Access System (SAS), which authorizesand manages CBRS spectrum use. | This seems to suggest that for passing certification, the CBSD UUT needs to pass testcases with the SAS test harness and provide proof of working with at least one certified SAS.
Suggestion: “,CBSDs are required to demonstrate compliance with the connection and interaction with a Spectrum Access System (SAS) test harness.” | | 2 | It also specifies verification tests and
recommended procedures for
demonstrating compliance with the rules governing the connection and interaction between the CBSD and one or more SASs. | The CBSD can connect to a single SAS at a time. If it attempts to connect to another SAS, this constitutes a new and separate registration. Suggestion: “between the CBSD and the SAS.” | | 2 | Footnote 2 | At what time does a sample need to be submitted to the FCC for PAG (e.g. before or after going to the test lab) . Can basic information be provided as to what is done in the PAG, what is required of the test lab and device manufacturer? | | 3 | a) The ability to compel the device-undertest (DUT) to operate on a channel selectable by test personnel. | This action can be accomplished by having the SAS provide a grant in the chosen channel and verifying externally that the CBSD under testis transmitting in that channel. | | Page | Text / area within OET Lab Report | Comment / Discussion | | --- | --- | --- | | 3 | b) The ability to vary the output power from the minimum to the maximum realizable levels and set it to a desired level. | The grant has an associated maximum EIRP value. Cycling the CBSD through a series of grant allocations with varying power and measuring the output power can provide the needed verification.
Clarification on the minimum level is requested. | | 3 | c) As needed, the ability to continuously transmit a modulated signal (i.e., with no time bursting or signal gating applied) . | Since many CBSDs are likely to support TDLTE where transmission DL alternates with receiving UL, this would require a special mode for the radio.
Please be specific about what needs may be found that would require this continuous transmission, what power levels would be used, what frequency range(s) might be tested, etc. | | 3 | a), b), c) | What is the essence for these test, are they intended for RF test where unit is not connected to a SAS or CBSD-SAS protocol | | 3 | d) The ability to enter all required SAS registration information. | CBSDs may be designed such that a significant amount of registration information is entered directly into the SAS by the CBSD vendor or by the CBSD User/Owner. Examples include the User/Owner name and contact information, antenna characteristics that apply to all units of a particular model from the CBSD vendor, EIRP capability, measurement capability, etc. There may be no provision in the CBSD software to hold or transmit all SAS registration information. | | 3 | e) The ability to view all information provided to the radio by the SAS. | This function can most easily and reliably be provided by an external protocol analyzer. | | 3 | Footnote 6 | Who determines whether a SAS test harness or actual SAS is used? I assume this would require running through the WINN Forum CBSD test cases on a certified SAS. It may be difficult for an actual SAS to run many tests designed for a SAS test harness.
Could the CBSD vendor and SAS vendor work together on a test plan / execution / results to demonstrate compliance? | | 4 | 1. Geo-location
Must determine its location to an accuracy of ±50 meters horizontal and ±30 meters of elevation. For nonprofessional installed devices it must report any location changes within 60 seconds. | The R&O specifies a vertical accuracy of
(+/-)3 meters. Maybe a clarification is needed. | | Page | T

FAQs

How should a CBSD demonstrate compliance with SAS access and interaction requirements?

The CBSD should show capability to access and interact with at least one Spectrum Access System (SAS) using a test harness, and provide proof that it is working with a certified SAS. The comments also suggest clarifying wording to focus on connection and interaction via the SAS test harness.

If a CBSD connects to multiple SAS instances, does that change the registration status?

The discussion indicates that the CBSD can connect to a single SAS at a time. Attempting to connect to another SAS is treated as a new and separate registration.

Who decides whether to use an SAS test harness or an actual SAS for testing, and how should collaboration work?

The comments ask who determines the harness-versus-actual approach and suggest running through WINN Forum CBSD test cases on a certified SAS. They also propose coordination between the CBSD vendor and the SAS vendor on a test plan, execution, and results to demonstrate compliance.

Sep 2, 2026

Uploaded by Taylor Morgan