GSM services P

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GSM SERVICES

By:-R.S.SARAWAGI

D.E.GSM

BRBRAITT,JABALPUR


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B

T

S

MSC VLR

HLR

PSTN

ISDN

Data

Networks

Air interface

OSS

B

T

S

B

T

S

MSC VLR

BSC

BSC

A Interface

A-bis interface


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BGW

SOG

OSS

GSM SYSTEM ARCHITECTURE

SCF

MINSDP

EIR AUC

HLR

Switching System

ILR

MSC/VLR

DTI SSF

MC

(MXE)

GMSC

OtherPLMNs

ISDN

PSTN

Public Data

Networks


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TRC

BSC

RBS

Base Station System


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GSM Services

The primary objective of a mobile

telephony system is to allow mobilesubscribers to communicate effectively.


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SERVICE CATEGO

RIES

main type of telecommunication services:

Basic services:available to all subscribers to a mobile network.e.g. voice telephone calls.

Supplementary services:Additional services that are available by subscription

only.

e.g. Call forwarding.


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Basic Telecocommunication Services

Two main categories:

Teleservices

Bearer Services


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Basic Telecocommunication Services

Teleservices

Teleservice allows the subscriber to communicate

(usually via voice, fax, data orSMS) with another

subscriber.

It is a complete system including necessary terminalequipment.


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Basic Telecommunication Services

Bearer services

It transports speech and data as digital information

within the network between user interfaces.

e.g.- a bearer service associated with the speech

telephony teleservice is the timeslot assigned to a

call on a TDMA frame over the air interface.


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Basic Telecommunication Services

BEARER SERVICES

GSM systems offer a wide range of bearer services.

The DTI supports data services offered by the system.

Rates up to 48 kbits/s are possible.


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BEARER SERVICES

Traffic to PSTN:For data traffic external to PLMN such as internetworking

with ISDN or directly to PSTN, the system selects asuitable modem in the DTI.

Traffic to ISDN:An entire set of data communication services with ISDN

terminals is available.No modem is necessary.


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Traffic to Packet Switched Public Data

Network (PSPDN):

Packet service supports synchronous data transfers with the

PSPDN with rates from 1.2 to 48 kbits/s.

With synchronous data transfers a packet mode terminal canbe directly connected to the MS.

Synchronous data communication between an MS and a

packet switched network is possible via the Packet

Assem

bler-Disassem

bler(PAD) facility.Rates between 300 and 9600 bits/s are supported.


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MSC/VLR

PADPSTN

PAD

PSTN

BSCIPNetworkPSPDN


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Traffic to Circuit Switched Public Data

Networks (CSPDN):Data communications with a CSPDN is possible via thePSTN or ISDN, depending on the CSPDN-transit networkinterface.

Traffic to Internet:Traditionally, an MSC accessed Internet nodes via existingnetworks such as the PSTN.

However, the direct access function enables an MSC tocommunicate directly with Internet nodes, thus reducing callset-up time.


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ISDN Primary Rate Access (PRA):This function enables an MSC to provide PRA services to subscribers.

Network operator can offer PABX connection services through the

PLMN.

PRA provides a data rate ofup to 2 Mbits/s.

MSC/VLR

PABX

ISDN PRA

BSC/TRC

PABX

ISDN PRA

Fax

Phone


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TELESERVICES

Speech

This is nor mal telephony (two-way voice

communication) with the ability to make andreceive calls to/from fixed and mobile subscribers

worldwide.


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TELESERVICES

Emergency calls

The emergency call function enables a subscriber

to make an emergency call by pressing a

predefined button or by using the emergency

num

ber.


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Facsimile group 3

GSM supports International Telecommunication Union

(ITU) group 3 facsimile.

Standard fax machines are designed to be connected to a

telephone using analog signals, a special fax converter is

connected to the exchange.

TELESERVICES


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TELESERVICES

Dual Tone Multi Frequency(DTMF)

A tone signaling facility which is often used for variouscontrol purposes, such as remote control of answering

machines and interacting with automated telephone

services.


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Alternative Speech/Fax

This service allows the subscriber to alternative

between speech and fax within one call setup.

The subscriber can switch several times within the

same call.

TELESERVICES


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Short Message Services (SMS)

The service allows simple text message consisting of a

maximum of160 alphanumeric characters to be sent to or

from an MS.

If the MS is switched off, or has left the coverage area, the

message is stores in a Short Message Service Center

(SMS-C).

When the mobile is switched on again or has re-entered thenetwork coverage area, the subscriber is informed that

there is a message.

TELESERVICES


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SMS-C

SubmissionDelivery

SMS-C


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SMS Cell Broadcast (SMSCB)

A text message with a maximum length of

93 characters can be broadcast to allmobiles within a certain geographic area.

traffic congestion warnings

accident reports,weather announcements and

advertisements.

TELESERVICES


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Voice mail

This service is an answering machine within the

network that is controlled by the subscriber.

The subscriber accesses the mail box using a

personal security code.

TELESERVICES


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Fax mail

This service allows the subscriber to receive faxmessage at any fax machine via the MS.

Fax message are stored in a network service center.

The subscriber accesses the fax mail via a personal

security code and the fax is then sent to the desiredfax number.

TELESERVICES


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SUPPLEMENTARY SERVICES

Call forwardingability to forward incoming calls to another

telephone number in the following situations:

Call forwarding on MS not reachable

Call forwarding on MS busy

Call forwarding on no reply

Call forwarding, unconditional


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Barring of outgoing calls

The subscriber can activate or deactivate this service from

the MS with a variety of options for barring outgoing calls.

Bar all outgoing calls

Bar all outgoing international calls

Bar all outgoing international calls except those directed to

the home PLMN.



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Barring of incoming calls

This is desirable because in some cases the called

mobile subscriber is charged for parts of an

incoming call (during international roaming)

Barring of all incoming calls Barring of incoming calls when outside home

PLMN


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Advice of Charge

The advice of Charge (AoC) service providesthe MS with information needed to calculatethe charge of a call. This information isprovided at call set-up.



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Account Codes

This service enables a subscriber, e.g. a business, toidentify an account number, which is to be charged for

particular call components.

Account codes can be identified on a per cell basis.


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Call waiting This service notifies the mobile subscriber, usually by

an audible tone, for incoming call.

The incoming call can be any type of basic service

including speech, data or fax.

There is no notification in the case of an emergency call

orSMS.



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Call hold

This supplementary service enables the subscribers to put

the basic normal telephony service on hold in order to set

up a new call or accept a waiting call.


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Multiparty service

The multiparty service enables a mobile subscriber to

establish a multiparty conversation, that is, a simultaneous

conversation between up to six subscribers.

This service can only be used with basic speech telephony.



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Calling line identification services:

These cover both the presentation and restriction

of the calling line identity.The presentation part of the service supplies the

called party with the ISDN orMSISDN number of

the calling party. The restriction service enables

calling parties to restrict the presentation of theirnumber on the MSs of called parties



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Connected line identification

presentation/restriction:

supply the calling party with theMSISDN number of the

connected (called)party.

The restriction enables the connected party to restrict the

presentation.



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Closed User Group (CUG)

The CUG service enables subscriber connected to the

PLMN/ISDN and possibly other networks, to form groupsin which access is restricted.

Example: members of a specific CUG can communicate

with each other, but generally not with users outside the

group.



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INNOVATIVE FEATURES

Innovative features offer a level beyond the basic network standards.

Single personal numberThe single personal number service allows a subscriber to

arrange call forwarding to other networks when the mobile

is not reached in the subscribers primary network.

One directory number can reach the subscriber even though

the subscribermay have subscriptions in several differentnetworks.


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INNO

VATIVEF

EATURES

Dual numberingThe features allows the subscriber to have two different

directory numbers connected to the same subscription andthe same mobile equipment.

In this way different accounts can be connected to the

different directory numbers.

e.g. the subscribermay want one business account and oneprivate account connected to the same subscription.


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Immediate call itemization:Hot billing

It is used when it is necessary to have immediate callcharging data output.

(e.g. to bill a third party foruse of a telephone, which is

rented).

INNO

VATIVEF

EATURES


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Regional and local subscription

These features allow subscribers to subscribe to a servicein a specified geographical area.

Requests for service outside the area are rejected with the

exception of emergency calls and SMS.

For local subscriptions, the geographical area consists of anumber of cells, and for regional subscription, the area

consists ofLAs.

INNOVATIVE FEATURES


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GEOGRAPHICALLY DIFFERENCIATED

CHARGING

This feature enables the GSMPLMN area to be dividedinto different tariff region.

The tariff regions is defined as a set of cells.

A subscribermay be offered cheaper calls within certain

areas.

INNO

VATIVEF

EATURES


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Value Added Services

1. Mobile Messaging

2. Mobile internet

3. Mobile intelligent Network Services


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Mobile Messaging

1. SMS2. MMS

3. EMS

4. Instant Messaging

5. Streaming


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SMS

The service allows simple text message consistingof a maximum of 160 alphanumeric characters to

be sent to or from an MS.

If the MS is switched off, or has left the coverage

area, the message is stores in a Short MessageService Center (SMS-C).


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MMS means a multimedia presentation which

consists of music, voice, image, text, video and

graphics all synchronized across a common

timeline.

Synchronized Power Point Presentations.

MULTIMEDIA MESSAGE SERVICE

(MMS)


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Enhanced Messaging System (EMS)

EMS can support relatively simple

pictures,sounds and animation.

It is a 3GPP standard.


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Instant Messaging

It enables to communicate with another

individual in real time, analogous to atelephone conversation but using text based

communication instead of voice-based

communication.


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Streaming

It enables real time or on demand

distribution of audio, video and multimedia

on the internet.

It is simultaneous transfer of digital media

(video,voice and data) so that it is received as

a continuous real-time stream.


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MESSAGING

TYPE

STREAMING

INSTANT

MESSAGING

CONTENT

CARRIED

REALTIMEDISTRIBUTION OFAUDIO, VIDEOANDMULTIMEDIA

REALTIMETEXTBASEDCOMMUNICATION

MMS PICTURES, SOUNDSAND ANIMATIONS

EMS RELATIVELYSIMPLEPICTURES, SOUNDSAND ANIMATIONS

SMSSIMPLETEXT

WIRELESS MESSAGING LADDER


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SMS MMS

Text Based Messaging

rich content including text, graphic,

photos etc.

Proprietary Standard Based upon 3 GPP & WAP standards.

Store & Forward system Store & Forward system

Uses signaling links MMS uses main data channel.

SMS & MMS


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Thanks

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GSM services P