1. Prepared By: GOPIKA D K/SHRUTHI N Department: ECE Date:27-03-2015
Subject Name: GSM
Subject Code:10EC843
Prepared By: GOPIKA D K/SHRUTHI N
Department: ECE
Date:
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2. MESSAGE, SERVICES,CALL FLOWS IN GSM
Unit 5
MESSAGE, SERVICES,CALL FLOWS IN GSM
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3. INTRODUCTION GSM PLMN SERVICES-THREE TYPES BEARER SERVICES
TELESERVICES
SUPPLEMENTARY SERVICES
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4. GSM offers Three service domains several types of connections-
GSM offers
several types of connections
voice connections, data connections, short message service
multi-service options (combination of basic services)
Three service domains
Bearer Services – interface to the physical medium (transparent for example in the case of voice or non transparent for data services)
Telematic Services – services provided by the system to the end user (e.g., voice, SMS, fax, etc.)
Supplementary Services – associated with the tele services: call forwarding, redirection, etc.
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5. BEARER SERVICES
Telecommunication services to transfer data between access points
R and S interfaces – interfaces that provide network independent data transmission from end device to mobile termination point.
U interface – provides the interface to the network (TDMS, FDMA, etc.)
Specification of services up to the terminal interface (OSI layers 1-3)
Transparent – no error control of flow control, only FEC
Non transparent – error control, flow control
Different data rates for voice and data (original standard)
voice service (circuit switched)
synchronous: 2.4, 4.8 or 9.6 Kbps.
data service (circuit switched)
synchronous: 2.4, 4.8 or 9.6 kbit/s
asynchronous: bit/s
data service (packet switched)
asynchronous: bit/s
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6. TELESERVICES
Telecommunication services that enable voice communication via mobile phones
All these basic services have to obey cellular functions, security measures etc.
Offered voice related services
mobile telephony primary goal of GSM was to enable mobile telephony offering the traditional bandwidth of 3.1 kHz
Emergency number common number throughout Europe (112); mandatory for all service providers; free of charge; connection with the highest priority (preemption of other connections possible)
Multinumbering several ISDN phone numbers per user possible
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7. Additional services: Non-Voice-Teleservices
group 3 fax
voice mailbox (implemented in the fixed network supporting the mobile terminals)
electronic mail (MHS, Message Handling System, implemented in the fixed network)
...
Short Message Service (SMS) alphanumeric data transmission to/from the mobile terminal using the signaling channel, thus allowing simultaneous use of basic services and SMS (160 characters)
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8. SUPPLEMENTARY SERVICES
Services in addition to the basic services, cannot be offered stand-alone
May differ between different service providers, countries and protocol versions
Important services
identification: forwarding of caller number
suppression of number forwarding
automatic call-back
conferencing with up to 7 participants
locking of the mobile terminal (incoming or outgoing calls)
...
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9. BS-MSC MESSAGES ON THE A INTERFACE-
GSM MESSAGES
MS-BS Interface-
RR MESSAGES
MOBILITY MANAGEMENT MESSAGES
CIRCUIT SWITCHED CALL CONTROL MESSAGES
BS-MSC MESSAGES ON THE A INTERFACE-
PHYSICAL LAYER
MTP
SCCP
BSSAP
BSSMAP
DTAP
BSSOMAP
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10. LOCATION MANAGEMENT SERVICES
MSC TO VLR AND HLR;
LOCATION MANAGEMENT SERVICES
PAGING AND SEARCH SERVICES
ACCESS MANAGEMENT SERVICES
HANDOVER SERVICES
AUTHENTICATION MANAGEMENT SERVICES
SECURITY SERVICES
SUBSCRIBER MANAGEMENT SERVICES
IDENTITY MANAGEMENT SERVICES
FAULT RECOVERY SERVICES
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11. GSM CALL FLOW SCENARIOS
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15. DATA SERVICES IN GSM DATA INTERWORKING ACCESSING ELECTRONIC MAIL
ACCESSING REMOTE COMPUTERS
FILE TRANSFERS
FACSIMILE TRANSMISSION
INTERNET ACCESS
TRANSACTION SERVICES
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16. MOBILE TELEPHONE ARCHITECTURE FOR DATA INTERWORKING
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18. 1 -INTERCONNECTION FOR SWITCHED DATA
GSM DATA SERVICES
1 -INTERCONNECTION FOR SWITCHED DATA
2-GROUP 3 FAX-Group 3 fax devices conform to the ITU-T T.4 and T.30 Recommendations which manage the procedures used for image conversion and fax transmission.
3-PACKET DATA ON THE SIGNALING CHANNEL
PDSS1
PDSS2
4-USER TO USER SIGNALING
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19. SMS APPLICATION LAYER TRANSFER LAYER RELAY LAYER LOWER LAYER
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22. GSM GPRS
NETWORK ARCHITECTURE
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24. PROTOCOL STACK FOR GPRS
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25. END
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