Citizens Broadband  Radio Service Device(CBSD), Its Types and OEMs

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Citizens Broadband  Radio Service Device(CBSD): As per FCC, an eNodeB which is capable to support CBRS band is referred as Citizens Broadband Radio Service Device. LTE band B42 and B43 mapped to CBRS frequency spectrum. CBSD devices are categorized into two types:

  • CBSD-Category A
  • CBSD-Category B

CBSD-Category A : 

  1. CBSD Category A shall not be deployed or operated outdoors with antennas exceeding a height of 6 meters above average terrain
  2. If it is deployed or operated outdoors with antennas exceeding 6 meters will be classified as, and subject to, the operational requirements of CBSD Category B
  3. CBSD Category A base station is permitted Maximum EIRP of 30 dBm (dBm/10 MHz) or 1 Watt
  4. When registering with a spectrum access system (SAS), Category A CBSDs must transmit with their requested authorization status (Priority Access or General Authorized Access), FCC identification number, call sign, user contact information, air interface technology, unique manufacturer’s serial number, and sensing capabilities if supported

CBSD-Category B : 

  1. CBSD Category B base station is permitted Maximum EIRP of 47 dBm (dBm/10 MHz) or 50 Watt
  2. Its deployment/operation is limited to outdoor and antenna height is expected more than 6 meter above the terrain
  3. CBSD Category B base station must be professionally installed
  4. When registering with an SAS, Category B CBSDs must transmit with their requested authorization status (Priority Access or General Authorized Access), FCC identification number, call sign, user contact information, air interface technology, unique manufacturer’s serial number, sensing capabilities (if supported), plus the following additional information: antenna gain, beam-width, azimuth, down-tilt angle, and antenna height above ground level.

End User Device (EUD):

  1.  CBRS EUD permitted to  Transmit Maximum Power 23dBm or 200 mili Watt
  2. These Device can operate only if they can positively recieve and decode an authorization signal transmitted by CBSD (CBRS base station)
CBDS Type Maximum EIRP
(dBm/10 MHz)		 Maximum EIRP
(dBm/MHz)		 Antenna Height 
(Meter)
Category A 30 dBm or 1 watt 20 dBm < 6 meters
Category B 47 dBm or 50 Watt 37 dBm > 6 meters
End User Device (EAD) 23 dBm or 200 mili Watt NA NA

Citizens Broadband  Radio Service Device(CBSD) OEMsThe Original Equipment Manufactures (OEMs) are shown in below picture:How Does CBRS Device Look Like

Image Courtesy: Ericsson

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