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BASE TRANCEIVER STATION
RC67T2A363060070077
INTRODUCTION
Base Transceiver Station (BTS)
An Antenna Set of tranceivers FAN unit Racks FACB (fan control board)
CLASSIFICATION OF BTS
BTS can be classified as
1. Indoor BTS
2. Outdoor BTS
MAINLY USED CARDS IN BTSBTS consists of mainly these cards: 1. SUMA card (station unit module advance) 2. TEPA card (transmitter equipment power
amplifier) 3. TREPA card (transceiver equipment power
amplifier) 4. TREPS card (transceiver equipment power
supply) 5. RT card (transceiver) 6. ANC card (antenna network chamber)
ARRANGEMENT OF CARDS
1 RT CARD
X 41
ANC
BTSBSC
MSC
=
BTS consists of three sectors named: ALFA, BETA, GAMA sectors.
BTS RACK FORMATION
RACK ASSEMBLYA rack has six shelves:
1
2
3
4
5
6
61 -
BTS RACKS
SUMA CARDS (BRAIN OF THE BTS)Functions of the Station unit module advance
(SUMA) card :
1. Timing and clock generation
2. Management of internal digital interface
3. Operation and maintenance function
4. Remote inventory
5. Digital transmission
6. Control DC-DC converter and check in of battery
ANC FUNCTIONANC FUNCTION
1. Setting the LNA game for the assigned TREA receiver
2. LNA alarm supervision3. Measuring of alarm VSWR4. Selection of antenna sector5. Reporting VSWR alarm6. RF cabling status detection7. Remote power ON/OFF via the BCB interface8. Status display via front panel LED’s9. RI via the BCB interface
FUNCTIONAL ARCHITECTURE
BTS FUNCTIONS
Transmission functionsTelecommunications functionsO&M functionsSupport functions
BTS FUNCTIONS
BTS functions are concerned with first three layer of the OSI model are:
LAYER 1:
Physical layer
LAYER 2:
Datalink layer
LAYER 3:
Network layer
BASE TRANSCEIVER STATION (BTS) FUNCTIONS
• Radio interface• Radio terminals for transmission and reception• RF Channel• TRX and MS communicates over Um interface• Voice encryption/decryption• Signal processing functions of the radio
interface• Received data transcoding