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Info: Biography, Pictures, Discography of all CDs & DVDs |
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| GSMA, the global trade association for mobile operators.New analysis, suggesting that PC manufacturers have yet to
deliver the right mobile broadband PC...Asia Mobile Innovation Awards...Download the new GSMA report 'Licensing for Growth'.In one year, the GSMA Development Fund has established 16 pilot projects in 9 countries and is beginning to bridge the digital divide.Produced at the GSMA Mobile Asia Congress 2007, the
Show Daily provides comprehensive coverage of show developments.Every day, millions of people enjoy the convenience provided
by GSM technology.Today, over 2 billion people have access
to GSM and 3GSM services and this number is growing rapidly.GSM Association 2008 GSM and the GSM Logo are registered and owned by the GSM Association.GSM customer counter, located on the homepage of GSM World is indicative only, estimated from market data collected by Wireless Intelligence.Eten outs the Glofiish X650
Lately Eten have been gaining popularity thanks to their feature packed devices with reasonable price tags.Thin Walkman refinedSony Ericsson W890 reviewWith 2008 around the corner, hopes are high for the coming year but the devoted fans of Sony Ericsson W880 have yet another reason to eagerly look forward.The expected release of Sony Ericsson W890 should....The Samsung i450 however might just be here to prove them wrong.Gotta love musicNokia 5610 reviewWe are having the pleasure of a handset that has been designed to meet the highest expectations of music fans.Slide over slimNokia 6500 slide reviewNokia 6500 slide was announced together with its slim sibling Nokia 6500 classic, but is far more than just an attempt to diversify the supply beyond the traditional bar form factor.GSM uses narrowband TDMA, which allows eight simultaneous calls on the same radio frequency.GSM was first introduced in 1991.As of the end of 1997, GSM service was available in more than 100 countries and has become the de facto standard in Europe and Asia.Site provides rates, rental plans and coverage maps.Supplies new and refurbished satellite phones, systems, service, and supplies for both rental and sale.Also check out the following links!Wireless Design OnlineExcellent resource for those involved in the design and development of wireless communications systems and equipment.Cellular PhonesGSM Products Find best prices on Cellular Phones at DealTime and save money!Copyright 2008 Jupitermedia Corporation All Rights Reserved.Mobile Communications, GSM is a digital
cellular communications system.GSM is designed to
provide a comprehensive range of services and features to the users not available on
analogue cellular networks and in many cases very much in advance of the old public
switched telephone network (PSTN).In addition to digital transmission, GSM
incorporates many advanced services and features like worldwide roaming in other GSM
networks.Bell Laboratories (in USA) in the early 1970s.However, mobile
cellular systems were not introduced for commercial use until the 1980s.During the early
1980s, analog cellular telephone systems experienced a very rapid growth in Europe,
particularly in Scandinavia and the United Kingdom, but also in France and Germany.Each
country developed its own system, which was incompatible with everyone else's in equipment
and operation.Europe were increasingly
unimportant.The market for each mobile equipment
was limited, so economies of scale, and the subsequent savings, could not be realized.European mobile cellular
radio system (the GSM acronym became later the acronym for Global System for
Mobile communications).In 1989 the responsibility for the GSM
specifications passed from the CEPT to the European Telecommunications Standards
Institute (ETSI).By the beginning of 1995, there were 60 countries with operational
or planned GSM networks in Europe, the Middle East, the Far East, Australia, Africa, and
South America, with a total of over 5.As of the end of 1997, GSM
service was available in more than 100 countries and has become the de facto standard in
Europe and Asia.Presently, GSM networks are operational or planned in over 80 countries
around the world.The GSM mobile telephony service is
based on a series of contiguous radio cells which provide complete coverage of the service
area and allow the subscriber operation anywhere within it.Cellular telephony differs from the radiophone service because instead of one large
transmitter, many small ones are used to cover the same area.The basic problem is to
handle the situation where a person using the phone in one cell moves out of range of that
cell.The functional architecture of a GSM
system can be broadly divided into the Mobile Station, the Base Station Subsystem, and
the Network Subsystem.Each subsystem is comprised of functional entities that
communicate through the various interfaces using specified protocols.The network subsystem, which is the main part of which is the Mobile
services Switching Center, 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.Fig 1: GSM Network Overview.The Mobile Station (MS) represents
the only equipment the GSM user ever sees from the whole system.It actually consists of
two distinct entities.The actual hardware is the Mobile Equipment (ME), which is
anonymous and consists of the physical equipment, such as the radio transceiver, display
and digital signal processors.The subscriber information is stored in the Subscriber
Identity Module (SIM), implemented as a Smart Card.The IMEI and the
IMSI are independent, thereby providing personal mobility.Thus the SIM provides personal
mobility, so that the user can have access to all subscribed services irrespective of both
the location of the terminal and the use of a specific terminal.By inserting the SIM card
into another GSM cellular phone, the user is able to receive calls at that phone, make
calls from that phone, or receive other subscribed services.The SIM card may be protected
against unauthorized use by a password or personal identity number.The MS is operational only when a
valid SIM is placed in a ME.The Base Station Subsystem is composed
of two parts, the Base Transceiver Station (BTS) and the Base Station Controller
(BSC).BSC operates with a group of BTSs
and manages the radio resources for one or more of them.The central component of the Network
Subsystem is the Mobile services Switching Center (MSC).The MSC provides the connection to the public fixed network (PSTN or ISDN) and is the
interface between the GSM and the PSTN networks for both telephony and data.Telecommunication services can be
divided into Bearer Services, Teleservices, and Supplementary
Services.Call diversion, caller identification, encrypted speech, fax and error
protected data are a few examples of current and new services provided by the GSM.Teleservice utilises the capabilities
of a Bearer Service to transport data, defining which capabilities are required and how
they should be set up.The most basic Teleservice supported by
GSM is telephony.These are both the fundamental
services for making ordinary telephone calls, but they are separated because of a special
need for Emergency calls.This means that
the GSM operator has the option to treat emergency calls differently by allowing mobile
equipment without a SIM card to make them.The ISDN, on which GSM is based, has a
great deal of potential for other information and data services.These are the videotext,
teletex, and electronic mail services.The Videotex, Teletex and Advanced
Message Handling Teleservices provide these for in GSM.The last of these covers the
electronic mail requirements.GSM has one more Teleservice that is designed for short, paging type messages.The SMS Teleservice was originally defined to utilise some spare signalling
capacity in GSM.However, it soon became apparent that SMS would become a key service in
differentiating GSM from any other cellular service.SMS is effectively an international
paging service, overlaid on top of the GSM network, with the capability to send, as well
as receive, messages.SMS, a message can be sent to another subscriber to the service,
and an acknowledgement of receipt is provided to the sender.The supplementary services basically
consist of call forwarding and call barring.The Call Forwarding Supplementary
Service is used to divert calls from the original recipient to another number, and is
normally set up by the subscriber himself.So, GSM devised some flexible services
that enable the subscriber to conditionally bar calls.Calling Line
Identification Presentation: This service deals with the presentation of the
calling party's telephone number.Connected
Line Identification Presentation: This service is provided to give the calling
party the telephone number of the person to whom they are connected.Connected
Line Identification Restriction: There are times when the person called does not
wish to have their number presented and so they would subscribe to this person.Normally,
this overrides the presentation service.The victim should subscribe to this
service, and then they could cause known malicious calls to be identified in the GSM
network, using a simple command.This identified number could then be passed to the
appropriate authority for action.Closer
User Group: This service is provided on GSM to enable groups of subscribers to
only call each other.User
Signalling: This service allows the subscriber to send and receive information to
and from the person with whom they have an active call.The amount of information is
limited, but may include text (such as names and addresses), and numbers (such as
telephone numbers).This party can be either another GSM Mobile Station or indeed, a
person on a different network.If A calls B, and B asks to be transferred to C, then it is not clear who
should be charged for the rest of the call (A, who initiated the call but is no longer a
participant, or B, who asked for the call transfer.To charge B is technically difficult.Thus it seems that probably the potential of GSM is not
fully realized till date.GSM is making the
world a small place !GSM (Global System for Mobile communication) is a digital mobile telephony system that is widely used in Europe and other parts of the world.GSM uses a variation of time division multiple access (TDMA) and is the most widely used of the three digital wireless telephony technologies (TDMA, GSM, and CDMA).GSM digitizes and compresses data, then sends it down a channel with two other streams of user data, each in its own time slot.It operates at either the 900 MHz or 1800 MHz frequency band.Mobile services based on GSM technology were first launched in Finland in 1991.Today, more than 690 mobile networks provide GSM services across 213 countries and GSM represents 82.According to GSM World, there are now more than 2 billion GSM mobile phone users worldwide.GSM World references China as "the largest single GSM market, with more than 370 million users, followed by Russia with 145 million, India with 83 million and the USA with 78 million users."Since many GSM network operators have roaming agreements with foreign operators, users can often continue to use their mobile phones when they travel to other countries.SIM cards (Subscriber Identity Module) holding home network access configurations may be switched to those will metered local access, significantly reducing roaming costs while experiencing no reductions in service.Switched Data (HCSD), General Packet Radio System (GPRS), Enhanced Data GSM Environment (EDGE), and Universal Mobile Telecommunications Service (UMTS).In the UK, Mike Pratt offers Links to GSM and UMTS Related Pages.African Cellular offers an illustrated GSM Data Speed Evolution to UMTS.Do you have something to add to this definition?FMC) is the trend towards seamless connectivity between fixed and wireless telecommunications networks...Specifications are subject to change without notice.Color CSTN Screen (128X128, 1.Specifications are subject to change without notice."The information on this page meets my needs." |
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