GSM

GSM (GLOBAL SYSTEM FOR MOBILE COMMUNICATION):

GSM ( GLOBAL SYSTEM FOR MOBILE COMMUNICATION )

DISCUSSION TOPICS:

DISCUSSION TOPICS History Goals Of GSM GSM Facts Building Blocks System Architecture Features (Basic and Advanced) Advantages of GSM Future – what’s next

HISTORY :

HISTORY Early 80’s Europe was experiencing rapid growth in the analog cellular telephone systems 1982 Conference of European Posts and Telegraphs (CEPT) GSM (Groupe Special Mobile) group was formed to study and develop a European public land mobile system GSM mandate was to develop a standard to be common for the countries that created it – provide service to the entire European continent

HISTORY contd.:

HISTORY contd. Each country developed its own system, which caused problems, System worked only within the boundaries of each country. international demand was so great that the system name was changed from Groupe Special Mobile to Global Systems for Mobile Communications (still GSM)

GSM criteria or Goals Of GSM:

GSM criteria or Goals Of GSM Low terminal and service cost Support for international roaming – one system for all of Europe Support for range of new services and facilities Enhanced Features ISDN compatibility Enhance privacy Security against fraud Good Speech quality

GSM facts(2001):

GSM facts(2001) Used in over 170 countries Over 400 GSM network operators Over 550 million people were subscribers to GSM

Building Blocks:

Building Blocks AMPS – Advanced Mobile Phone System TACS – Total Access Communication System NMT – Nordic Mobile Telephone System

Building Blocks contd.:

Building Blocks contd. AMPS – Advanced Mobile Phone System analog technology used in North and South America and approximately 35 other countries operates in the 800 MHz band using FDMA technology

Building Blocks contd.:

Building Blocks contd. TACS – Total Access Communication System variant of AMPS deployed in a number of countries primarily in the UK

Building Blocks contd.:

Building Blocks contd. NMT – Nordic Mobile Telephone System analog technology deployed in the Benelux countries and Russia operates in the 450 and 900 MHz band first technology to offer international roaming – only within the Nordic countries

GSM System Architecture:

GSM System Architecture Mobile Station (MS) Base Station Subsystem (BSS) Network Switching Subsystem (NSS) Network Management Subsystems (NMS)

GSM System Architecture :

GSM System Architecture

System Architecture Mobile Station (MS):

System Architecture Mobile Station (MS) The Mobile Station is made up of two entities: Mobile Equipment (ME) Subscriber Identity Module (SIM) SO  ME + SIM = MS

System Architecture Mobile Station (MS) contd.:

System Architecture Mobile Station (MS) contd. Mobile Equipment (ME) Produced by many different manufacturers Uniquely identified by an IMEI (International Mobile Equipment Identity) Subscriber Identity Module (SIM) Smart card containing the International Mobile Subscriber Identity (IMSI) Allows user to send and receive calls and receive other subscribed services

System Architecture Base Station Subsystem (BSS):

System Architecture Base Station Subsystem (BSS) The BSS is responsible for managing the radio network and is controlled by an MSC. Base Station Subsystem is composed of two parts Base Transceiver Station (BTS) Base Station Controller (BSC)

System Architecture Base Station Subsystem (BSS) contd.:

System Architecture Base Station Subsystem (BSS) contd. Base Transceiver Station (BTS) Houses the radio transceivers that define a cell Handles radio-link protocols with the Mobile Station Speech and data transmissions from the MS are recoded

System Architecture Base Station Subsystem (BSS) contd.:

System Architecture Base Station Subsystem (BSS) contd. Base Station Controller (BSC) Manages Resources for BTS Handles call set up Location update Handover for each MS

System Architecture Network Switching Subsystem(NSS):

System Architecture Network Switching Subsystem(NSS) The NSS is responsible for Call Control and Charging The Components are: 1) Mobile Switching Center (MSC): Switch data connections between: Base Station Controllers Mobile Switching Centers 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 Architecture Network Switching Subsystem contd.:

System Architecture Network Switching Subsystem contd. 2) Home Location Registers (HLR) - contains administrative information of each subscriber Maintains the permanent Register of the subscriber. 3) Visitor Location Registers (VLR) - contains selected administrative information from the HLR authenticates the user Services the subscriber can use 4) Authentication Center (AUC) mainly used for security We can verify sim cards 5) Equipment Identity Register (EIR) - Responsible for IMEI checking (checking the validity of mobile equipment).

Network Management Subsystems (NMS):

Network Management Subsystems (NMS) Is the operation and maintenance part of he network. Is needed for the control of the whole GSM network The Functions of NMS are Fault management Configuration management Performance management Monitoring Nodes on the Network

Basic Features Provided by GSM:

Basic Features Provided by GSM 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

Advanced Features Provided by GSM:

Advanced Features Provided by GSM Calling Line ID - incoming telephone number displayed Alternate Line Service - one for personal calls - one for business calls Closed User Group - call by dialing last for numbers Advice of Charge - tally of actual costs of phone calls Fax & Data - Virtual Office / Professional Office Roaming - services and features can follow customer from market to market

Future -- UMTS (Universal Mobile Telephone System:

Future -- UMTS (Universal Mobile Telephone System Reasons for innovations new service requirements availability of new radio bands User demands seamless Internet-Intranet access wide range of available services compact, lightweight and affordable terminals simple terminal operation open, understandable pricing structures for the whole spectrum of available services

Advantages of GSM :

Advantages of GSM Crisper, cleaner quieter calls Security against fraud and eavesdropping International roaming capability in over 100 countries Improved battery life Efficient use of spectrum Advanced features such as short messaging and caller ID A wide variety of handsets and accessories High stability mobile fax and data at up to 9600 baud Ease of use with over the air activation, and all account information is held in a smart card which can be moved from handset to handset

The End:

The End Thanks Shabbir Ahmad (2043) M. Saleem (2070) M. Zain (2048) M. Burhan (2068)

Pop Quiz!:

Pop Quiz! EIR stands for… a) Equipment Identity Register b) Engine Identity resister c) Entity identity resource d) Equipment identity resource Q.1

Pop Quiz!:

Pop Quiz! BSC stands for… a) Base Station Controller b) Base Station Count c) Base Station Subsystem d) Base Station Common Q.2

Pop Quiz!:

Pop Quiz! SIM stands for… a) Subscriber entity model b) Subscriber identity module c) Subscriber internet model d) Support identity module Q.3