CBRS Network Architecture and Spectrum Access System (SAS) Operation

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CBRS Network Architecture and Spectrum Access System (SAS) Operation

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CBRS is known as Citizen broadband radio service, It is a 150 MHz wide broadcast band in 3.5 GHz band starting from 3550 MHz to 3700 MHz. In 2017, the FCC completed a process to establish rules for commercial use of this band.
CBRS frequency spectrum shall help 4G/5G mobile networks deployment quicker and easier.
Considering CBRS is deployed with 4G LTE technology, it is very much similar to LTE network where we have a 4G eNodeB, Core Network for Packet services and IMS for voice and multimedia service.
An eNodeB which is capable to support CBRS band is referred as Citizens Broadband Radio Service Device.
while comparing CBRS network with traditional LTE network we can see an additional node known Spectrum Access System (SAS).
SAS is a three-tier spectrum authorization framework to accommodate a variety of commercial uses on a shared basis with incumbent federal and non-federal users of the CBRS band.
General Authorized Access (GAA): This is for users that will potentially have access to all 150 megahertz in the 3550-3700 MHz. General Authorized Access users are permitted to use any portion of the 3550-3700 MHz band not assigned to a higher tier user and may also operate opportunistically on unused Priority Access channels.
Spectrum Access System (SAS) Interface and Operation
CBRS eNodeB (CBSD) Registration Request/Response
When CBRS eNodeB gets powered on, it start the SAS-CBSD registration procedure with the SAS to gain access to the spectrum.
After successful registration, it performs a spectrum inquiry for the available channel information from the CBRS band.
Upon success of the spectrum inquiry, the CBRS eNodeB sends a grant request with one of the operating channels and peak power is received in the spectrum inquiry response.
In case of an inquiry failure, the CBRS eNodeB continues with grant procedure.In response to the grant request, the eNodeB gains approval for the requested frequency channel and peak transmit power

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