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