BASE TRANSCEIVER STATION “BTS”

By-Shubham SinghalEC-09

EVOLIUM A9100

INDOOR-BTS

(MBI5)

GSM System Architecture

BTS MBI 5 &BTS MBI3

A9100 Base Station Architecture (BTS)

General Architecture of BTSBTS has three levels-:

-Antenna Coupling Level (ANC)

-Transceiver Level (TRX)

-Base Station Control Function (BCF) level

1. Antenna Coupling Level (ANC)

Stage b/w antenna & TRX Levels

A single module called ANC perform these functions for up to 4 TRXs.

For higher capacity, a combiner stage can be added.

ANC ARCHITECTURE

2. TRX(Transceiver Level) Transceiver Equipment…

Used for reception & transmission of signals.

One ARFCN is allotted to one TRX.& each ARFCN is divided in 8 time slots, hence one TRX can provide connection to 8 subscribers at a time…

One BTS= 12 TRX=12 ARFCN=12x8= 96 users….

At a time only 96 users can make calls….

Base Station Control Function (BCF)

This station is ensured by Station Unit Module (SUMA): central unit of BTS.

Only one SUMA for one BTS….

Generating clocks for all other BTS modules.(synchronization purpose)

e.g. Abis link…..

MBI5 Module Positions

ANC Front Panel

SUMA

STATION UNIT MODULE

BTS Functions

The primary responsibility of the BTS is to transmit and receive radio signals from a mobile unit over an air interface.

 BTS is a plain transceiver which receives information from the MS (mobile station) through the Um air interface and then converts it to a TDM (PCM) based interface, the Abis interface, and sends it towards the BSC. 

Thank You!!!!