Alcatel BSS

All rights reserved © 2010, Mobiserve

Prepared By: RIZWAN AHMED RAFIQ Operation Support Engineer (Training & Consultancy)

ALCATEL BTS

ALCATEL BTS


The BTS provides two-way radio communication between the PSTN and Mobile Station (Mobile Set) located in a single GSM cell. It also provides a similar link between the mobile station and the rest of the networks. The BTS provides on interface for the digital baseband signals used by the land based networks and the GSM radio signals used by mobile station.

BTS Role in GSM Network


Logical position of BTS in BSS


Functional Architecture of BTS


As the principal interface between the PSTN and Mobile Stations, the BTS performs four primary functions.

Transmission function: which manage the transfer of traffic and control data between the BTS and BSC.

Telecommunication functions: which manage the transfer of traffic and control data between the BTS and Mobile Station.

O&M function: which supervise the operation of the BTS.

Support function: which provides a logical and physical environment in which the BTS functions can be realized.

BTS Functions

Communication between the transmission, telecommunication, and O&M functions is managed according to the OSI model. The BTS functions are concerned with layer 1 (Physical), Layer 2 (Data Link), and Layer 3 (Network) of this model.


To minimize operating costs, all data passed between the BTS and BSC in Time division multiplexed onto a single physical interface. This is the Abis Interface, which carries all the data sent between the BSC and BTS. Logical links between the BSC and BTS handles the following information:

Transmission Functions

Signaling data used for control purposes

O&M data for the BTS transmission module

O&M data for the BTS entities

User data in the form of speech and data

traffic.


For BTS and BSC multiplexing equipment is normally connected using dedicated cabling. Other method of Abis Interface connection can be used for BTS, where the installation of the dedicated cabling in not possible. In this case, control of the transmission medium is in the hands of third party.

Abis Interface:

Microwave Link (used where line of sight radio path is

available.

Leased Line (Copper Cable or Fiber Optic used where the

distance

between the BSC and BTS is too great for microwave).

Satellite Link (Used where Previous two methods are not

possible)

Transmission Functions


There are two primary telecommunication functions:

Based band functions modulate and encode traffic and signaling data from the BSC according to GSM recommendations. This data is then sent to the Mobile Stations using the RF function. Traffic and signaling received from the Mobile Stations is demodulated and decoded to recover the baseband data.

Baseband Functions:

Telecommunication Function


Telecommunication Function

RF functions enable traffic and signaling to be sent and received over the Air Interface as a radio signal. A special link layer protocol ensures the reliable transfer of signaling data over the Air Interface.For antenna Diversity, the telecommunication function uplink path is duplicated. The duplicated functions intend from the antennas, through the RF functions.

RF Function:


O&M Functions

O&M functions monitor and control the correct operation of the BTS and its external interfaces. These function are shared between the BTS and BSC. The BSC provides overall control.The O&M function use Layer 2 links for BTS internal communications. A terminal connected via an MMI is used for local operator control of the BTS.

There are three categorized of O&M function:Configuration ManagementFault ManagementExternal Alarm Handling.

The O&M function also control the operation of the RF self-tests and manage the actions required by the BTS recovery Strategy.


Support Function

The support function provides a number of services relevant to the internal working of the BTS are:

Internal Power Supplies.

Internal Temperature Control.

Master Frequency.

Clock generation and distribution.

External alarm collection.

Internal self tests.


Introduction ofALCATEL

BTS

Introduction ofALCATEL

BTS


BTS Circuit Breakers (BCB)

Network Interface Card

External Alarm Circuit Board (EACB)

Shelf # 5

Shelf # 4

Shelf # 3

Shelf # 2

Shelf # 1

Combiners

TRE

SUMA Card


Port Address:

Formula:

16n + 1 ( n = shelf number )

This formula is for the first port of each shelf. For remaining three ports add 3 in the above formula for each port.


External Alarm Circuit Board (EACB)

Abis Patching

BTS Circuit Breakers (BCB)

Clock Port


BTS Circuit Breakers

(BCB)


External Alarm Circuit Board

(EACB)


Abis Patching

Clock Port


Transmitter Connector

Antenna Connector

Lock Fastener

Module Extractor

Receiver Connector

Equipment Label

Bridge


Lock Fastener


Module Extractor

Receiver Connector

Antenna Connector

Equipment Label

Bridge


Lock Fastener


Module Extractor

Equipment Label

ON/OFF Switch

USB Test Connector

Receiver Connector

LEDs


Abis ½ Connector

Lock Fastener

Equipment Label

BTS ConnectionArea Connector

BTS Terminal Connector

Test Connector

USB Connector

LEDs


Remote Inventory

Cable(RI Cable)


Remote Inventory Cable

(RI Cable)


Cabinet Cooling Fan


Connect to Alcatel BTS Using

BTS-Terminal release B9

Connect to Alcatel BTS Using

BTS-Terminal release B9


User Name

(COMMTE)

Or(UPGRAD)

Password(COMMT

E)Or

(SUMSUP)


Press Baud rate button to set it


Select Baud rate = 19200

Select the appropriate COM Port


Press F2 OR “Connect/Disconnect”

button OR

File->Connect/Disconnect from menu


Following windows will open on establishing successful

connection

Menu bar will be changed on establishing successful

connection


Monitor Active Alarms


External Active Alarms Show Here


Show Hardware Configuration (Ctrl H)


Select Appropriate Module

Select OK

Select “All”

Close


SUMA Card = OMU 1

Rack A (BTS Cabinet # 1)

Shelf # 2

Slot # 7


SBL Module States (F5)


VSWR Values

Antenna 0=A

Antenna 1=B

RA 1= Combiner 1 Sector A


SBL Module States (F3)


SBL Management


SBL Management Read

Initialize

Disable

Restart

Reset

CloseSelect Module


Execution Result

Selected Module Type

State of the Module (NEQ/OPR/IT)


Modify Hardware

Configuration


Remove Module


Click “Remove”

Select Module to Remove


End Modification of HW Configuration


Following window appears(Cabling Detection in

Progress)


Click Yes


Final Window


THANK YOU

Alcatel BSS

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