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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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Presentation Transcript
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 …
slide19
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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