SHORT MESSAGE SERVICE(SMS)

Seminar on

by Sujisha.k

INTRODUCTION

• SMS appeared on the wireless scene in 1991 in Europe. The European standard for digital wireless, now known as the Global System for Mobile Communications (GSM), included short messaging services from the outset.

• In North America, SMS was made available initially on digital wireless networks built by early pioneers such as BellSouth Mobility, PrimeCo, and Nextel, among others. These digital wireless networks are based on GSM, code division multiple access (CDMA), and time division multiple access (TDMA) standards.

SMS(Short Message Service)

• Short Message Service is a mechanism of short messages over the mobile networks

• The message from the sending mobile is stored in a SMC which then forward it to the destination

• Short message can be no longer than 160 character• An interesting feature of SMS is return reciepts• SMS used signaling channel as opposed to dedicated

channel• SMS support national & international roaming

HOW DOES SMS WORK

SSME

SME

SMC

SSMC

GMSC

HLR

MSC

VLR

BSS

MS

SME

TECHNICAL DETAILS

GSM• Short Message Service –Point to Point(SMS-PP) was originally

defined in GSM• GSM defines the Short Message Service –Cell

Broadcast(SMS_CB)

GATEWAY PROVIDERS• SMS gateway providers facilitate sms traffic b/w businesses

and mobile subscribers.• SMS gateway providers classified as aggregators and

SS7providers

MESSAGE SIZE

•Short messages can be encoded using a variety of alphabets

•Depending on which alphabet used leads to maximum short message sizes of 160 7-bit,140 8-bit,70 16-bit characters

INTERCONNECTIVITY WITH OTHER N/W

•Message service centers communicate with PLMN or PSTN via interwoking & GMSCs

•Subscriber originated messages are transported from handset to service center &may be destined for mobile users,subscribers on a fixed n/w

SMS SPOOFING

• It occur when a fraudester manipulates address information in order to impersonate a user .

• Detecting and blocking spoofed message can be implemented using intelligent routing function.

TYPES OF SMS

1. FLASH SMS it appears directly on the main screen without

user interaction

2. SILENT SMS It will not shown up on the display

directly.

Network architecture

Subscriber Services

• SMS comprises two basic point-to-point services:

• Mobile-originated short message (MO–SM)

• Mobile-terminated short message (MT–SM)

DIFFERENCE B/W SMS & E-MAIL

SMS

• Text message in cellphones

• It needs cell phone

• 160 characters• Not carry multimedia

files

E-MAIL

• Digital message in neworks

• It need internet connection,pc etc.

• 1000 characters• It carry multimedia files

APPLICATIONS

• It is possible to send e-mail messages from a mobile phone to e-mail

• Provide information service like news , weather etc.

• Mobile chatting• Downloading new ringtones• Alphanumeric paging services

LIMITATIONS

• Vanilla in nature

• Limited by size

• Data rate and latency

• Store and forward nature of SMS

CONCLUSION……….

SMS,because of its very nature has uniqueadvantages that other non voice sevices do nothave.it is a very convenient way of xchagingsmall bits of information b/wusers

THANK YOU

Questions?