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Mobile System SMS - 160 bytes that saved an industry. Johan Montelius [email protected] Overview. Background History of SMS, functionality, usage … Infrastructure SMSC, SMPP, GSM 03.40 … Message format 160 characters, Smart-messaging, EMS …. In short. two-way

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Mobile system sms 160 bytes that saved an industry

Mobile SystemSMS - 160 bytes that saved an industry

Johan [email protected]


Overview
Overview

  • Background

    • History of SMS, functionality, usage …

  • Infrastructure

    • SMSC, SMPP, GSM 03.40 …

  • Message format

    • 160 characters, Smart-messaging, EMS …


In short
In short

  • two-way

    • terminals can both send and receive

  • stor-and-forward

    • delivered when terminal is activated

  • short message

    • 140 bytes or 160 7-bit characters

  • available

    • mainly GSM systems but also in other cellular systems


History
History

  • Specified in GSM phase 1 standard

  • First public service in 1994

  • Roaming

    • Slowly introduced in 1999

  • Market takes off in 1999

    • 1 billion messages/month in Apr 1999

    • 3 billion messages/month in Dec 1999



Telia in norway and sweden 2001
Telia in Norway and Sweden 2001

Norway: 13% of turnover

Sweden: 4% of turnover

Norway: 900M messages/ 1 M subs

Sweden: 400M messages/ 3,2 M subs


Usage
Usage

  • Operators report an average of 10-30 user originated messages per month.

  • Traffic:

    • voice message notification

    • P2P messaging

    • ring tones / logos

    • sports scores

    • other information services


Premium sms
Premium SMS

Request sent as SMS message

Same request short-number (1985) regardless of operator.

Sender of request is charged 10 NOK.


Location based services
Location based services

Request sent as SMS message

Operator dependant service



Infrastructure
Infrastructure

  • MT

    • SMS capable terminal

  • SMSC

    • Short message service centre

  • Mobile network

    • Network to deliver the SMS


Smsc the heart of sms
SMSC – the heart of SMS

GSM Network

MSC

MSC

SMSC

IWMSC/GMSC

MSC

MT


Smsc interface
SMSC Interface

SM-TP

Short message transport protocol

HLR

GSM 09:02

GSM 04:11

MSC

GSM 03:40

SMSC

Not standardized by ETSI

Fixed network


The smsc
the SMSC

  • Vendors

    • CMG, Comverse, Logica, Sema Group …

  • Servers

    • Reliable, distributed

    • 2500 messages/s

    • Integrated billing support


Everyone wants a standard
Everyone wants a standard

Sema

Logica

CMG

Nokia

OIS

SMPP

UCP

CIMD

www.smsforum.net

Fixed network

TCP/IP X.25



Sms format
SMS format

  • Specified in GSM 03:40 and 09:11

  • 140 bytes or 160 7-bit characters

  • Three types of messages:

    • User: normal text messages

    • Mobile: OTA configuring

    • SIM: operator specific applications


Extensions to sms
Extensions to SMS

  • Nokia: Smart messaging

    • OTA provisioning

    • ring tones, logos

  • EMS Enhanced Messaging Service

    • 3GPP

    • Ericsson, Siemens, Alcatel , Motorola

    • ringtones, sound, logos, images, animations, text style …


EMS

EMS header

standard 7-bit characters

  • Content

    • Formating information, pre-defined or user supplied content.

  • Pointers

    • Where in the text flow?


Do it yourself sms interface
Do it yourself SMS interface

  • Modem signaling using standard GSM phone


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