global telecom services

8/6/2019 Global Telecom Services

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Global Telecom

Services

Deals as a vendor organization and

operates in the area of Operation andMaintainance.

Situated in tilak nagar, new delhi


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GSM SYSTEM

ARCHITECTURE BTS-Base

Transceiver Station

BSC-Base StationController

BSS-Base StationSubsystem

MSC-Mobile

switching Centre GMSC-Gateway

Mobile SwitchingCentre


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BASE TRANSCEIVER

STATION This station is used

to transmit and

receiving of thesignal.

The purpose of BTS

is to provide radio

access to the MS to

manage the radioaccess aspects of

the BTS contain.


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BASE STATION CONTROLLER

BSC control several

BTSs.

Around of 25 BTSscontrolled by 1 BSC.

Controls the power

transmitted by the

BTS or MS.

Generates a

handover to another

cell when required.


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BASE STATION SUBSYSTEM

BSS is the combination of

BTS AND BSC.

The BSS is a system of

base station equipmentwhich is viewed by the

MSC through the single

interface as being the

entity responsible for

communicating withmobile stations in certain

area.


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MOBILE SWITCHING

CENTRE It is used to routing

the combined traffic

of MS (MobileStation) in their

respective cells.

MS consist of ME

(Mobile Equipment)

and SIM (SubscriberIdentity Module)


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GATEWAY MOBILE

SWITCHING CENTRE Act as interface and a

router to external

network.

Contain routinginformation for GPRS

mobiles which is used to

tunnel packet through IP

based internal backbone

to the correct servingGPRS supporting mode.

It act as packet filter for

incoming traffic.


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TRANSMISSION SYSTEM

Transmission System are of two types:

1. Single Channel System

2. Multi-Channel System

Multiplexing

Two most common methods of

multiplexing:1. TDM (Time Division Multiplexing)

2. FDM (Frequency Division Multiplexing)


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MODULATION

Modulation is a process in which the signal tobe transmitted varies some characteristics ofa carrier signal.

Modulation used to transmit Analog Signal:1. AM (Amplitude Modulation)

2. FM (Frequency Modulation)

3. PM (Phase Modulation)

Modulation used to transmit Digital Signal:

1. PAM (Pulse Amplitude Modulation)

2. PWM (Pulse Width Modulation)

3. PCM (Pulse Code Modulation)


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SWITCHING

To establish a connection between two

points.

Major Component of Switching Systemis Switching Matrix.

Switching Techniques:

1. Time Switching2. Space Switching

3. Combinational Switching


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ANALYSIS ON 3G THIRD

GENERATION 3G is also known as UMTS.

And popularly known as White Paper

UMTS (Universal Mobile telecommunication System)

System that delivers high bandwidth data and voiceservices to mobile users.

3G wireless technology will allow an individual to haveimmediate access to location-specific services that offerinformation on demand.

One of the most important aspects of 3G wirelesstechnology is its ability to unify existing cellular standards,such as CDMA, GSM, and TDMA, under one umbrella.


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GPRS NETWORK

GPRS (General PacketRadio Service)

This service sends packetsof data

Data can be split into manypieces, then sent over thenetwork and resembled atthe other end.

It consist of an IP-basedPublic Mobile Land Network(PLMN), Base Station

Services (BSS), Mobilehandsets (MS), and MobileSwitching Centers (MSC) forcircuit-switched networkaccess and databases.


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GSM v/s GPRS

Global Systems for Mobile Communications or GSM is the standard bearer of the2G technologies. It is the most widely used technology in the world for mobilephone communications.

GPRS is an upgrade over the basic features of GSM. It allows mobile handsets toobtain much higher data speeds than what standard GSM can offer.

One of the features that was introduced into GSM networks was the ShortMessaging System (SMS) or more commonly known today as text messages

A feature that used GPRS technology was the Multimedia Messaging System orMMS. It allowed subscribers to send videos, pictures, or sound clips to each otherjust like text messages

GPRS also gave mobile phones the ability to surf the internet at dial-up speedsthrough WAP enabled sites on the other end GSM doesnt allow this type ofservices.

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