Download - sms messaging /mms messgaing / gsm concept
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1Developing Mobile Applications 2G1722 – Johan Montelius
Developing Mobile Applications
Messaging – SMS, WAP Push and MMS
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2Developing Mobile Applications 2G1722 – Johan Montelius
The SMS architecture
MSCSMSC
SGSN
service center: +46708000708
PI
A user can change SMSC.
A roaming user will use it home SMSC.
SMS over GPRS is more efficient (less setup time) but not always available.
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3GSM Network and Services 2G1723 Johan Montelius
SMS services
• Mobile Terminating and Mobile Originating SMS is treated as two different services.
• Mobile has the address of a SMS service center (in the home PLMN) to which all messages are sent.
• The SMSC can be reached from external nodes (Short Message Entities) through a number of protocols.
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4GSM Network and Services 2G1723 Johan Montelius
SMS signalingS MS C
submission
delivery
delivery report
sub. report
status report
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5GSM Network and Services 2G1723 Johan Montelius
SMS-SUBMIT
RP DHI S RR RDVPF MTI
message reference
7 6 5 4 3 2 1 0
destination address (2 – 12 octets)
protocol identifier
coding scheme
validity period (0, 1 or 7 octets)
user data length
user data ( 0 – 140 octets)
• Message Type Indicator – 01 submit
• Reject Duplicate• Validity Period Format
– relative, enhanced, absolute, not available
• Status Report Request
• User Data Header Ind.
• Reply Path Request
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6GSM Network and Services 2G1723 Johan Montelius
SMS Destination
• Length of address (one byte)• Format (one byte)
– Type of number: int, nat, local, .. – Numbering plan: E.164, ...
• The number – 46 70 91 23 45 6 is coded like– 64 07 19 32 54 F6 in hex
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7GSM Network and Services 2G1723 Johan Montelius
Protocol Identifier
• regular: SME to SMSC• page: acknowledge but do not notify
user • mobile: handled by the terminal • SIM: handled by the card• telematic services: fax, telex, email• many more ......
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8GSM Network and Services 2G1723 Johan Montelius
Coding scheme
• Coding group– general, message waiting, data
• Character coding– GSM 7-bit (3GPP 23.038) – Universal Character Set (ISO 10646)– 8-bit data– Text compression
• Message class– immediate display (message)– mobile, SIM, terminal equipment (computer)
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9GSM Network and Services 2G1723 Johan Montelius
SMS Validity period
• Relative received by SMSC (1 octet):– 0-143 x 5min– 144-167 12h + x 30 min– 168-196 x days– 197-255 x weeks
• Absolute (7 octets)– year (00-99), month, day, time
• Enhanced– resending, relative, absolute time
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10GSM Network and Services 2G1723 Johan Montelius
SMS user data
• Text SMS in 7bit GSM alphabet– one escape character that changes
character table
• Text SMS in USC2 16-bit for non-latin alphabets
• 8-bit user data– possibly containing user data headers
• In total – 140 bytes or– 160 7-bit characters
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11GSM Network and Services 2G1723 Johan Montelius
Let's send a SMS
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12GSM Network and Services 2G1723 Johan Montelius
SMS-DELIVER
RP UDHI S R I MM MTI
coding scheme
7 6 5 4 3 2 1 0
time stamp (7 octets)
user data length
user data ( 0 – 140 octets)
• Message Type Indicator (00)
• More messages• Status Report Ind.
– did the sender request a status report
• UDHI– user data header
indication
• RP– reply path set
protocol identifier
originator address (2 -12)
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13GSM Network and Services 2G1723 Johan Montelius
User data headers
UDHL IE IE User Data
id lth data
user data header length
information element
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14GSM Network and Services 2G1723 Johan Montelius
Information Elements
• Concatenating messages• Enhanced Message Service
– each IE is a icon, sound or formating instruction and a position where this should be visible
– a set of predefined icons– Nokia introduced their own version “smart
messaging” that allowed ring tones and backgrounds to be sent over SMS.
• Application addressing– this is important
• Much more
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15GSM Network and Services 2G1723 Johan Montelius
SMS infrastructure
SMSCSME
You :-)
HTTP/XML
SMPP
AT+
content provider
serviceprovider
mobile operatorPOP/SMTP
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16GSM Network and Services 2G1723 Johan Montelius
WAP Push over SMS
• What do we want to send– we don't want to surf the web!
• Network initiated– the message is a WSP Push– delivered over WDP/UDP to the terminal, to a
specified port– the WDP/UDP packet is sent over SMS– the terminal need to have a process listening
on the port
• WAP Push Application– listening on port 2948
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17GSM Network and Services 2G1723 Johan Montelius
MMS
• Multimedia Message Service– MMS 1.0 uses WAP 1.x stack– MMS 1.1-2 uses either WAP 1.x or 2.0– read WAP 205 MMS Architecture Overview
• Messages submitted using WSP/HTTP.• Notification delivered using WAP Push (over
SMS). • Message retrieved by terminal using WSP/
HTTP
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18GSM Network and Services 2G1723 Johan Montelius
MMS protocols
HTTP POSTMMSCWAPgw
WSP Push
HTTP GET
HTTP reply
ack
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19GSM Network and Services 2G1723 Johan Montelius
MMS content
• A MMS message is coded using – RFC 2822, Internet message – RFC 2045,.. Multipart Internet Mail Extensions
(MIME)
• Content is often a SMIL message– Synchronised Multimedia Integration
Language
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20GSM Network and Services 2G1723 Johan Montelius
MMS - submission
X-Mms-Message-Type: m-send-reqX-Mms-Tranaction-ID: 345 :To:+46709123456/TYPE=PLMNFrom: ????Subject: this is a testContent-type: application/vnd.wap.multipart.mixed; boundary=foo-bar
:Content-type: application/vnd-wap-mms-message :
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21GSM Network and Services 2G1723 Johan Montelius
MMS - SMIL
<smil> <head> <layout> <root-layout/> <region id=”Image” top=”0” left=”0” ... /> <region id=”Text” top=”50%” left=”0”.. /> </layout> </head> <body> <par dur=”4000ms”> <text src=”foo.txt” region=”Text”/> <img src=”bar.gif” region=”Image”/> </par> </body></smil>
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22GSM Network and Services 2G1723 Johan Montelius
MMS - notification
X-Mms-Message-Type: m-notification-indX-Mms-Tranaction-ID: 567 :From:+46709123456/TYPE=PLMNSubject: this is a testX-Mms-Content-Location: http://mmsc.operator.com/msg23
:Content-type: application/vnd-wap-mms-message :
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23GSM Network and Services 2G1723 Johan Montelius
MMS notificationSMS to +46709123456
UDP to port 2948
WSP Pushx-wap-application: mms.uacontent-type: application./vnd.wap.mms-message
X-Mms-Message-Type: m-notification-indX-Mms-Tranaction-ID: 567 :From:+46709123456/TYPE=PLMNSubject: this is a testX-Mms-Content-Location: http://mmsc.op...
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24GSM Network and Services 2G1723 Johan Montelius
Service Indication/Load
• Instead of pushing a MMS-notification we can push a other messages
• Service Indication – contains a URL that is opened by
the browser (if the user agrees)• Service Load
– The terminal will retrieve the settings automatically (depending on security settings)
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25GSM Network and Services 2G1723 Johan Montelius
Service IndicationSMS to +46709123456
UDP to port 2948
WSP Pushx-wap-application: wml.uacontent-type: application./vnd.wap.sic <?xml version="1.0"?> <!DOCTYPE si PUBLIC "-//WAPFORUM//DTD SI 1.0//EN" "http://www.wapforum.org/DTD/si.dtd"> <si> <indication href="http://www.foo.com/test.wml" > This is a test. </indication> </si>
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26GSM Network and Services 2G1723 Johan Montelius
J2ME
• Using J2ME and JSR-120 WMA you can register a midlet on a port.
• The messages can be sent using SMS port addressing.
• Cool– P2P games over SMS– initiate communication from the
network– wake up on SMS