mobile system sms - 160 bytes that saved an industry johan montelius jm@sics.se
Post on 22-Dec-2015
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Overview
• Background– History of SMS, functionality, usage …
• Infrastructure– SMSC, SMPP, GSM 03.40 …
• Message format– 160 characters, Smart-messaging,
EMS …
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
• 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
2 9
T e l ia A B , IR , 0 2 2 -2 0 0 2 , s v
T e l ia M o b ile
F o r t s a t t t i l lv ä x t fö r S M S
ja n fe b m a r a p r m a j ju n i ju li a u g s e p o k t n o v d e c
A n d e l a v o m s ä t tn in g e n Q 4S v e r ig e 4 % , N o r g e 1 3 %
A n d e l a v o m s ä t tn in g e n Q 4S v e r ig e 4 % , N o r g e 1 3 %
( m ilj o n e r m e d d e la n d e n )
0
3 0 0
6 0 0
9 0 0
N o r g e 2 0 0 1
N o r g e 2 0 0 0
S v e ri g e 2 0 0 1
S v e ri g e 2 0 0 0
Norway: 900M messages/ 1 M subs
Sweden: 400M messages/ 3,2 M subs
Norway: 13% of turnover
Sweden: 4% of turnover
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
Same request short-number (1985) regardless of operator.
Sender of request is charged 10 NOK.
Request sent as SMS message
Infrastructure
• MT – SMS capable terminal
• SMSC– Short message service centre
• Mobile network– Network to deliver the SMS
SMSC Interface
MSC
SM-TPShort message transport protocol
GSM 03:40
GSM 04:11
GSM 09:02
HLR
SMSC
Fixed network
Not standardized by ETSI
the SMSC
• Vendors– CMG, Comverse, Logica, Sema Group
…
• Servers– Reliable, distributed– 2500 messages/s– Integrated billing support
Everyone wants a standard
Logica
Fixed networkTCP/IP X.25
SMPP
www.smsforum.net
UCP CIMD
OIS
Sema
CMGNokia
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
• Nokia: Smart messaging – OTA provisioning– ring tones, logos
• EMS Enhanced Messaging Service– 3GPP – Ericsson, Siemens, Alcatel , Motorola – ring tones, sound, logos, images,
animations, text style …
EMS
standard 7-bit characters
EMS header
- Content-Formating information, pre-defined or user supplied content.
- Pointers-Where in the text flow?
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