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:27-03-2015 11/12/2018

MESSAGE, SERVICES,CALL FLOWS IN GSM Unit 5 MESSAGE, SERVICES,CALL FLOWS IN GSM 11/12/2018

INTRODUCTION GSM PLMN SERVICES-THREE TYPES BEARER SERVICES TELESERVICES SUPPLEMENTARY SERVICES 11/12/2018

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. 11/12/2018

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: 300 - 1200 bit/s data service (packet switched) asynchronous: 300 - 9600 bit/s 11/12/2018

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 11/12/2018

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) 11/12/2018

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) ... 11/12/2018

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 11/12/2018

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 11/12/2018

GSM CALL FLOW SCENARIOS 11/12/2018

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DATA SERVICES IN GSM DATA INTERWORKING ACCESSING ELECTRONIC MAIL ACCESSING REMOTE COMPUTERS FILE TRANSFERS FACSIMILE TRANSMISSION INTERNET ACCESS TRANSACTION SERVICES 11/12/2018

MOBILE TELEPHONE ARCHITECTURE FOR DATA INTERWORKING 11/12/2018

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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 11/12/2018

SMS APPLICATION LAYER TRANSFER LAYER RELAY LAYER LOWER LAYER 11/12/2018

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GSM GPRS NETWORK ARCHITECTURE 11/12/2018

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PROTOCOL STACK FOR GPRS 11/12/2018

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