1 kommunikatsiooniteenuste arendus irt0080 loeng 7/2009 avo ots telekommunikatsiooni õppetool, ttÜ...
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Kommunikatsiooniteenuste arendusIRT0080
Loeng 7/2009
Avo Otstelekommunikatsiooni õppetool,
TTÜ raadio- ja sidetehnika [email protected]
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Multi-Dimensional - Wireless
TechnologiesA
pp
lica
tion
s
Services
•2G/3G cellular -> 4Gmobile
•Wireless Local Loop (WLL)
•Broadband Wireless Access (BWA)
•Wireless LAN
•Satellite Wireless
•Microwave Link
•Specialized wireless
• …………………….
•Wireless telephony
•Wireless internet
•Wireless Data
•Specialized services
• …………………..
•Free mobile (drive)
•Restricted mobile (walk)
•Fixed wireless trunking
•Fixed wireless extension
•Fixed wireless access
•Nomadic wireless
• ………………. Standards
•ITU IMT2000
•ITU WAS (JRG8A-9B)
•ETSI UMTS
•TIA IS 41/95/136
•MMDS/LMDS/WCS/UNII
•ETSI BRAN
•IEEE 802.11/15/16
• ……………...
Business
•CDG
•WATM WG
•3GPP/3GPP2
•MWIF
•WCA
•PCIA
•WAP
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Generic access network
Corenetwork
Switchingnode
Residential
Business
Acc
ess
node
Remoteelectronics
Flexibilitypoint
Fibre, copper, radio etc
Customer Last drop Feeder Local exchange Core network
• Often referred to as the “last mile” or “first mile”
• Dominated today by twisted pair copper cable
• Traditionally, has only had to accommodate voice traffic. Now many more demands are being placed on the access network - data, multimedia etc
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Access network topology
PCP - primary cross-connection pointDP - distribution point
Customer connections
4800/.324800/.32
2400/.42400/.4
1000/.41000/.4PCP PCP
PCPPCP
1000/.41000/.4
2400/.42400/.4 1000/.41000/.4
500/.4500/.4
200/.4200/.4
20/.520/.5100/.5100/.510/.510/.5
10/.510/.5
ExchangeExchange
Manhole orManhole orfootway boxfootway box
Distribution PointDistribution Point
E-side cable (pairs/mm)E-side cable (pairs/mm)
D-side cable (pairs/mm)D-side cable (pairs/mm)
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Attenuation
Att
enua
tion
(dB
/km
)
Frequency (kHz)1 1000
0.1
1.0
10
10 100
0.9 mm Cu
0.32 mm Cu
Attenuation is a function of frequency due to the “skin-effect”
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VDSL• Broadband services could do with a higher data transfer rate than ADSL can
support
• The same principles as ADSL (clever DSP) can be applied to address this by limiting the reach of the system
• VDSL supports data rates to over 50 Mbit/s to the customer thereby enabling support of these very broadband services
• The shorter reach of VDSL though means that data must be carried from the exchange to a point close to the customer (see later)
PCP
Exchange Existing E-side Cables Existing D-side Cables
VDSL Cabinet
New Fibre Feed
Bit rate (Mbit/s) Reach Suitability
13 1.5 km FTTCab
26 1.0 km FTTC/FTTB
52 300 m FTTB
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Passive Optical Networks
OLT
SPLITTER
ONU
ONU
ONU
Local
Exchange
PCP
Cabinet
Customer
Premises
Optical Line Termination
Optical Network Unit
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UMA Backhaul Approach
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10
GSMOB
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Interference
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VoiceTelephony & Voice Mail
Unified MessagingConferencing
Find-Me-Follow-MeCall Center
VideoMessaging/MailConferencing Surveillance
CollaborationInstant Messaging
eMeetingsWeb Conferencing
Business AppsCRM, Supply Chain, Call
Center
IntegrationWEB-Portal, Desktop, Devices and
Server-Business Process
Presence
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Lingidhttp://www.3gpp.org/GERAN
http://en.wikipedia.org/wiki/GERAN
http://en.wikipedia.org/wiki/Unlicensed_Mobile_Access
http://www.dectweb.com/News&Views/Features/9906Dectweb.htm
http://www.riigiteataja.ee/ert/act.jsp?id=13060116