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GSM BASICS

OBJECTIVE Learn Basics Of GSM & Terminologies

What is Communication ? The exchange of information is called communication ( The Tx or Rx of information )

Media of Communications Wired Communication  Wireless Communication 

What is Wired Communication ? Communication with physical connectivity between Transmitter and Receiver.

Equipment's of Wired Communication Normal Telephone Communication (PSTN)  FAX Communication  Telex Communication 

What is wireless Communication ? Communication without actual physical connectivity between Transmitter and Receiver

Equipment's of Wireless Communication       

Cordless phones Pagers DECT phones Radio Television GSM CDMA

Advantage of wireless communication Mobility  Direct approach  Availability  Reliability 

Disadvantages of wireless communication Poor voice Quality ( At times )  Communication depends upon Signal Quality  High Cost (equipment)  Power require for Hand set 

What is GSM Communication ? GLOBAL SYSTEM OF MOBILE COMMUNICATIONS is called GSM Communication  GSM Specifications designed by European Telecommunications Standards Institute Committee ( ETSI ) 

GSM GSM is the international standard in Europe, Australia and much of Asia and Africa. In covered areas, cell-phone-users can buy one phone that will work anywhere else the standard is supported. To connect to the specific service providers in these different countries, GSM-users simply switch subscriber identification module (SIM) cards. SIM cards are small removable disks that slip in and out of GSM cell phones. They store all the connection data and identification numbers you need to access a particular wireless service provider.

1900 MHz GSM 1900 MHz GSM phones used in the United States are not compatible with the international system. If you live in the United States and need to have a cell phone access when you're overseas, the easiest thing to do is buy a GSM 900MHz/1800MHz cell phone for traveling.

GSM Capacity   



GSM uses 13 kbps voice communication. In 20MHz of total spectrum (paired spectrum of 10MHz each way), 400 channels are available. When using non-sectorised cells, at best a reuse efficiency of 0.33 is possible. This implies, about 400 x 0.33 or 135 channels per cell implying a trunking efficiency of about 0.85. Thus the number of subscribers per cell works out to be approximately 766. For a cell radius of 10 kms, 3 kms and 1 km, of the subscriber density served given by 766/(p r2) will be 2.4, 27, and 245 subscribers/sq km, respectively.

The GSM network can be divided into four main parts The Mobile Station, which is carried by the subscriber  The Base Station Subsystem, which controls the radio link with the Mobile Station  The Network and Switching Subsystem, the main part of which is the Mobile Services Switching Center and which performs the switching of calls between the mobile and other fixed or mobile network users, as well as management of mobile services, such as authentication  The Operation and Support Subsystem, which oversees the proper operation and setup of the network. 

GSM GLOSSARY

TERMINOLOGIES

WIRELESS Wireless is a term used to describe telecommunications in which electromagnetic waves (rather than some form of wire) carry the signal over part or all of the communication path.

SMS SMS (Short Message Service) A service for sending messages of up to 160 characters to mobile phones that use Global System for Mobile (GSM) communication. SMS messages do not require the mobile phone to be active and within range. They can also be sent from a website.

EMS Enhanced Messaging Service (EMS) is an adaptation of the Short Message Service (SMS) that allows users to integrate text, melodies, pictures, sounds, and animations to enhance the expressive power of messages.

GPRS General Packet Radio Services (GPRS) is a packet-based wireless communication service that promises data rates from 56 up to 114 Kbps and continuous connection to the Internet for mobile phone and computer users. As GPRS becomes available, mobile users of a virtual private network will be able to access the private network continuously rather than through a Dial-up connection.

GPRS Classes      

  

Class 2 --one up 8-12kbps,2 down 16-24kbps-(2+1) Class 4 - one up 8 -12 kbps,3 down 24 -36kbps Class 6 - two up 16 -24 kbps,three down 24 -36kbps Class 8 -one up 8 - 12 kbps ,four down 32 - 40 kbps class 10 - one up 8 -12 kbps, four down 32 -48 kbps or two up16 -24 kbps ,three down 24 -36 kbps Class 12 - one up 8 - 12 kbps ,four down 32-48 kbps or two up 16 -24 kbps,three down 24 -36 kbps or three up 24 -36 kbps ,two down 16 -24 kbps or four up 32 -48 kbps one down 8 - 12 kbps NOTE UP means transmit DOWN means receive

PACKET SWITCHING GPRS involves overlaying a packet based air interface on the existing circuit switched GSM network. This gives the user an option to use a packet-based data service. To supplement a circuit switched network architecture with packet switching is quite a major upgrade. With GPRS, the information is split into separate but related "packets" before being transmitted and reassembled at the receiving end. Packet switching is similar to a jigsaw puzzle- the image that the puzzle represents is divided into pieces at the manufacturing factory and put into a plastic bag. During transportation of the now boxed jigsaw from the factory to the end user, the pieces get jumbled up. When the recipient empties the bag with all the pieces, they are reassembled to form the original image. All the pieces are all related and fit together, but the way they are transported and assembled varies. The Internet itself is another example of a packet data network, the most famous of many such network types.

WAP WAP (Wireless Application Protocol) is a specification for a set of communication protocols to standardize the way that wireless devices, such as cellular telephones and radio transceivers, can be used for Internet access, including email and the World Wide Web.

HSCSD High Speed Circuit Switched Data (HSCSD) is an enhancement of data services ("Circuit Switched Data - CSD) of all current GSM networks. It allows you to access non-voice services at 3 times faster, which means subscribers are able to send and receive data from their portable computers at a speed of up to 28.8 kbps; this is currently being upgraded in many networks to rates of and up to 43.2 kbps.

BLUE TOOTH Bluetooth is a computing and telecommunications industry specification that describes how mobile phones, computers, and personal digital assistants can easily interconnect with each other using a shortrange wireless connection. Bluetooth requires that a transceiver chip be included in each device.

INFRARED Infrared refers to energy in the region of the electromagnetic radiation spectrum at wavelengths longer than those of visible light, but shorter than those of radio waves. Infrared is used in a variety of wireless communications, monitoring, and control applications.

EDGE EDGE - or Enhanced Data Rates for Global Evolution - is a 3G radio technology that triples the high-speed datacom capacity of GPRS- (General Packet Radio Service) enhanced GSM networks, enabling GSM operators to provide high-speed Mobile Internet services over existing infrastructure. Operators can use this datacom capacity boost to increase individual user data rates by three times, or to serve three times the number of datacom users, or to free up capacity for still-expanding voice traffic.

3G RADIO TECHNOLOGY What different services will be available on third generation systems?  Video on demand, high speed multimedia and mobile Internet access are just a few of the possibilities for users in the future. 3GSM Services will expand the possibilities of information and communication.  The main benefit is that they will offer high-end service capabilities, which includes substantially enhanced capacity, quality and data rates than is currently available. They will also include the concurrent usage of multiple services.  3GSM Services will also bridge the gap between the wireless world and the computing/ Internet world, making inter-operation apparently seamless.

VOICE RECOGNITION Voice or speech recognition is the ability of a machine or program to receive and interpret dictation, or to understand and carry out spoken commands.

Current data speeds available Type

Uplink(send)

Downlink(Rx)

GPRS

14kbps

28-64 kbps

GSM CSD

9.6-14 kbps

9.6 –14 kbps

HSCSD

28 kbps

28 kbps

Dial up

56 kbps

56 kbps

ISDN

64 kbps

64 kbps

ADSL

256 kbps

512 kbps

BROADBAND 2 Mbps

2MBPS

WAP Settings (Wireless Access Protocol )

WAP SETTINGS  

NAME HOME URL

:- ESSAR/Hutch :- http://

www.wap.essarcellworld.com      

SECUIRITY DIGITAL DIAL # ANALOG DIAL # CIRCUIT TYPE GATE WAY IP PORT NO.

:-Non secure :-12388 :- 12388 :- ANALOG TYPE :- 010.010.001.100 :- 9201

GPRS General Packet Radio Service

GPRS GPRS stands for General Packet Radio Service. This service facilitates high speed of data transmission and uses the Packet Switching Technology offering air interface transfer rates at much higher speeds than normal data transfer depending on mobile terminal capabilities and Carrier interference. GPRS allows multiple users to share the same air interface resources.

GPRS GPRS is a boon to that segment of customers who would like to transmit data intermittently which offers them at the most economical prices as compared to the conventional mode of Data transfer on Circuit switched data. As on date users can experience data transfer speeds up to 43 Kbps, which is much higher than a normal dial up modem. Users can now surf Internet, view their Company’s Intranet databases, Mails using their Handsets. Because of its characteristics, GPRS has found itself a place in the foray of building of tremendous Value Added Services, which will help realize the dreams of “Data hungry” users

BENEFITS OF GPRS

BENEFITS OF GPRS High Speed Data Access: As the name Packet Switching Technology infers, now no longer is the Data transfer restricted to the conventional 9.6 Kbps. As on date, Speeds upto 43 Kbps can be experienced by a user depending on the resources allocated. However, these speeds can be increased theoretically up to 171 Kbps.

BENEFITS OF GPRS Always “ON”: With GPRS, users now no longer be worried of connecting and disconnecting with the prevailing mindset of coughing up huge amounts for airtime, which was so till date. Once logged, the user needs to only worry about the data, which is transferred, thereby making GPRS a viable bearer for cost effective data communication.

BENEFITS OF GPRS Single

Network

for Voice

&

Data:

GPRS uses the same network, which was supporting for Voice. This benefit is transferred to the user when he is receiving or making any voice calls. This is basically possible due to the Technology behind GPRS.

MMS MMS Enables people to send pictures, text and voice at one go through MMS Handset.

In most cases setting on Handset would happen via OTA, Incase OTA is not working or manual settings have to be done following process needs to be followed:

NAME HOME URL SECUIRITY DIGITAL DIAL # ANALOG DIAL # CIRCUIT TYPE PPP ID PPP PW GATE WAY IP PORT NO.

:- AIR TEL :- http:// www.airteltango.com :- Non secure :-22222 :- 22222 :- ANALOG TYPE :- Provided by service provider :- Provided by service provider :- 202.056.231.021 :- 9201

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