CBRS COMPREHENSIVE QUESTIONS AND CORRECT
VERIFIED ANSWERS(PRACTICE TEST) ALL PASSED
EXAM 2024 UPDATE
What does the SAS do?
The SAS gathers information from data bases maintained by the FCC to ensure lower
priority user are not interfering with higher priority users.
CBSD
Are devices that transmit in the CBRS band to end users.
CBSD need what before that can transmit in the CBRS band?
CBSD need authorization from the SAS before transmitting to ensure there is no
interference to higher priority users.
Some CBSD communicate through a ________ to access the SAS.
Domain Proxy
EUD
End User Device.
The SAS can ________ or __________ access.
Allow or disallow
When the SAS detects an incumbents user all lower end user must get out of the
way within _______.
5 minutes
ESC
Environmental sensing capability
ESC detect when a incumbent user is broadcasting in the CBRS band and
communicates with the _______ to alert all lower end tiers.
SAS
CPI is responsible for?
Entering accurate information about all CBSD to the SAS.
A CPI needs to record the _______ and _______ with in 50 meters or better.
latitude and longitude
CBRS
Citizens broadband radio service and shared spectrum.
CBRS band
3550 - 3700 MHz frequency range and established by FCC in 2015.
CBRS vision
Used for fixed and mobile broadband services.
advantages of CBRS
1. Efficient
2. Time to market.
3. Cost
4. Feasibility
, SAS (Spectrum access system)
Is the centralized cloud service that manages CBRS transmission to protect higher
priority users from interference.
The three main entities for CBRS
1. FCC
2. Winnforum
3. CBRS Alliance
CPI (certified professional installer)
Ensures data entered into the SAS is correct and has the right data. The SAS needs
this information to protect higher end users.
CBRS Three tiers
Tier 1. Incumbent
Tier 2. PAL ( Priority Access License)
Tier 3. GAA (General Authorized Access)
Tier 1 Incumbents
Services using the band before CBRS was around.
Tier 2 PAL
CBRS user that pay for a license at auction to receive interference protection.
Tier 3 GAA
Is free to use by any opportunistic users.
A CBSD need to be authorized by __________ before it can be used the transmit
in the CBRS band.
FCC
First a CBSD must send a ______________ to the SAS. The SAS with
communicate with the CBSD by sending a ____________ code.
Registration request.
Registration response.
Second, once a CBSD is registered the CBSD must then send a ____________ to
the SAS so see what Spectrum is being used by other users. The SAS will
respond back to the CBSD with a __________.
1. Spectrum inquiry request.
2. Spectrum inquiry response with a list of frequencies and TX power the CBSD can
use.
Third the CBSD will send a __________ to the SAS asking to use a range of CBRS
spectrum at a giving TX power. (Ex. id like to use 3570 MHz - 3590 MHz at TX
power of 27 dBm.) If the SAS approves it will give a _________.
1. Grant request.
2. ID for the spectrum grant.d
Last before a CBSD can transmit is must send a ________. The SAS with respond
with Heartbeat respond code.
Heartbeat request
A CBSD is required to heartbeat at least once every ____________ to the SAS.
4 minutes
If a CBSD stops it heartbeat to the SAS is must stop ________ until is
successfully heartbeats again.
Transmitting
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