[email protected], E.R.Edwards Applied Comms Technology Lecture 2 Mobile Communications Introduction to mobile networks Current state Technology Applications Players The impact of 3G networks Costs and implementation in an organisation Summary Slide1
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[email protected]@staffs.ac.uk, E.R.Edwards Applied Comms Technology Lecture 2 Mobile Communications Introduction to mobile networks.
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Applied Comms TechnologyGSMGlobal System for Mobile Communications (
http://en.wikipedia.org/wiki/Gsm)>3 billion in more than 212 countriesRoaming between mobile phone operators“112” - Emergency telephone number worldwide
1997 added packet data capabilities via GPRS (General Packet Radio Service)
1999 Introduced higher data speeds using EDGE (enhanced Data rates for GSM evolution)
Applied Comms TechnologyGSMGSM Cell radius depends on
Antenna heightAntenna GainPropagation conditions
Longest in practical use is 35 kmIndoor coverage by in-building penetration or
Indoor picocell base station orIndoor repeaterDistributed indoor antennas fed through power splittersUsed where high call capacity need e.g. shopping centre
General Packet Radio Service (GPRS)This standard was agreed by ETSI in March
1998It is designed to allow data communication to
take place within the existing GSM infrastructure and technology
A few additional servers are added to the network to allow this.
Speeds of 140Kbits in theory, typical 56KbpsPacket switched rather than circuit switchedThis is described as being a 2.5G technologyTo use GPRS you will need a GPRS enabled
device. Existing GSM devices will not be able to make use of the additional features.
Applied Comms Technology3G UMTSUniversal Mobile Telecommunication System (UMTS)
Full packet driven architecture for voice and for data transmissions.
Packet based networks allow for an increased amount of traffic on a medium.
Up to 21Mbits/s using HSDPA (actual 384Kbits or 7.2Mbits HSDPA)
The only time part of that medium is blocked is when a device is transmitting or receiving.
Consider how often, in your phone calls, you actually say nothing;-Natural pause between words, taking a breathWaiting for a response, thinking of something to say – “errrr”
WCDMA or CDMA2000 instead of TDMA – American systemWideband Code Division Multiple AccessTime Division Multiple Access
Applied Comms TechnologyInvestment in what?What would you buy/how to become 3g as a firm?How do you plan to use mobile/wireless technologies ?What wireless network is currently available in your area
and what will be available in the future? SecurityLearning curves for employeeAlternatives to 3G?
Wireless broadband (local area only)Bluetooth (pico-network, very local)
Applied Comms TechnologyMMSMultimedia Messaging Service (MMS)
Allows the transfer of more than text between mobile devices Old devices do not need to be compatible! In the event of an incompatible device being sent a MMS, they will receive an Internet
link insteadThe message can then be view on the Internet at a later stage
Is only available on GPRS devices and newer
The following are the current standards, may be expanded in the future
This is a list of base requirements for devices to be given the title of MMS compatible
GSM – Global System for MobilesTDMA – time division, multiple accessGPRS – General Packet Radio ServiceEDGE – Enhanced Data rates for Global EvolutionCDMA2000 – A standard Code Division Multiple AccessWCDMA – Wideband Code Division Multiple AccessHSPA – High Speed Packet AccessCEPT – The Electronic Communications CommitteeETSI – European Telecommunications Standards InstituteSMS – Short Messaging ServiceUTMS – Unrealistically Twisted Mental Shenanigans?UTMS – Universal Mobile Telecommunications SystemQoS – Quality of Service