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“ GSM – GLOBAL SYSTEM FOR MOBILE COMMUNICATION” Submitted to – Mr. Pradeep Thripathi Presented by- Murali Prasad Tiwari Roll No. 0302IT071038 Seminar on


DISCUSSION TOPICS- History services System Architecture Handover Security Advantages of GSM


HISTORY Early 80’s Europe was experiencing rapid growth in the analog cellular telephone systems In 1982 GSM stands for “Group Special Mobile”developed by an initiative of CERN(Conference of European Post and Telecommunication) The main aim was to introduce GSM to replace the incompatible analog system. Late 1989’s GSM work was transferred to the European Telecommunication Standards Institute (ETSI)

HISTORY contd. : 

HISTORY contd. Presently the responsibility of GSM standardization resides with special mobile group under ETSI ( European telecommunication Standards Institute ). Full set of specifications phase-I became available in 1990 Under ETSI, the international demand was so great that the system name was changed from Group Special Mobile to Global Systems for Mobile Communications (still GSM). Today many providers all over the world use GSM.

Slide 5: 

GSM Services Tele-services Bearer or Data Services Supplementary services

Bearer Services : 

Bearer Services Include various data services for information transfer between GSM and other networks like PSTN, ISDN etc at rates from 300 to 9600 bps Group 3 fax

Tele Services : 

Tele Services • Telecommunication services that enable voice communication via mobile phones • Offered services - Mobile telephony, -Emergency calling , -Short Message Service (SMS), -Enhance Message Service(EMS), -Multimedia Message Service(MMS)

Supplementary Services : 

Supplementary Services Call related services : Call Waiting- Notification of an incoming call while on the handset Call Hold- Put a caller on hold to take another call Call Barring- All calls, outgoing calls, or incoming calls Call Forwarding- Calls can be sent to various numbers defined by the user Multi Party Call Conferencing - Link multiple calls together

Slide 9: 

System Architecture

System Architecture : 

System Architecture Mobile Station (MS) Mobile Equipment (ME) Subscriber Identity Module (SIM) Base Station Subsystem (BBS) Base Transceiver Station (BTS) Base Station Controller (BSC) Network Subsystem Mobile Switching Center (MSC) Home Location Register (HLR) Visitor Location Register (VLR) Authentication Center (AUC) Equipment Identity Register (EIR)

System ArchitectureMobile Station (MS) : 

System ArchitectureMobile Station (MS) The Mobile Station is made up of two entities: Mobile Equipment (ME) 2. Subscriber Identity Module (SIM)

System ArchitectureBase Station Subsystem (BSS) : 

System ArchitectureBase Station Subsystem (BSS) Base Station Subsystem is composed of two parts that communicate across the standardized Abis interface allowing operation between components made by different suppliers Base Transceiver Station (BTS) Base Station Controller (BSC)

System ArchitectureNetwork Subsystem : 

System ArchitectureNetwork Subsystem Mobile Switching Center (MSC) connections between: Base Station Controllers Mobile Switching Centers GSM-networks Other external networks Heart of the network. Three main jobs: 1) connects calls from sender to receiver 2) collects details of the calls made and received 3) supervises operation of the rest of the network components

System ArchitectureNetwork Subsystem contd. : 

System ArchitectureNetwork Subsystem contd. Home Location Registers (HLR) - contains administrative information of each subscriber - current location of the mobile Visitor Location Registers (VLR) - contains selected administrative information from the HLR authenticates the user tracks which customers have the phone on and ready to receive a call periodically updates the database on which phones are turned on and ready to receive calls

System ArchitectureNetwork Subsystem contd. : 

System ArchitectureNetwork Subsystem contd. Authentication Center (AUC) mainly used for security data storage location and functional part of the network Key is the primary element Equipment Identity Register (EIR) - Database that is used to track handsets using the IMEI (International Mobile Equipment Identity) Made up of three sub-classes: The White List, The Black List and the Gray List Optional database

GSM System Architecture : 


Handovers : 

Handovers Inter cell Between 1 and 2 – Inter BTS / Intra BSC Between 1 and 3 – Inter BSC/ Intra MSC Between 1 and 4 – Inter MSC

Handover contd. : 

Handover contd.

Security in GSM : 

Security in GSM Access control and Authentication. Confidentiality. Anonymity. SIM is provided 4-8 digit PIN to validate the ownership of SIM 3 algorithms are specified : - A3 algorithm for authentication - A5 algorithm for encryption - A8 algorithm for key generation

Advantages of GSM over Analog system : 

Advantages of GSM over Analog system Capacity increases Reduced RF transmission power and longer battery life. International roaming capability. Better security against fraud (through terminal validation and user authentication). Encryption capability for information security and privacy. Compatibility with ISDN,leading to wider range of services

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