CM09_6.1new_UMTS_Introduzione 18sl RIVEDI

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R. Cusani, Comunicazioni Mobili 2, Marzo 2009
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Riferimenti:
  H. Holma, A. Toskala (ed.): “WCDMA for UMTS”, Wiley, 2000
  F. Muratore (ed.): “UMTS: Mobile Communications for the Future”,
Wiley 2000
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
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  Standard per radiomobili cellulari di terza generazione (3G)
  I cellulari di seconda generazione (2G) come il GSM sono orientati
alla trasmissione della voce ed offrono anche trasmissione dati a
bassa velocità con commutazione di circuito
  L’ UMTS è orientato a trasmissioni multimediali voce,
video e dati:
  velocità di trasmissione variabile (fino a 2 Mbps per
utenti in area urbana con velocità di pochi m/sec)
  Possibilità di Qualita’ di Servizio (QoS)
  L’ UMTS deve inoltre supportare la trasmissione a
pacchetto
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
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  2x60 MHz paired bands (1920-1980 MHz and 2110-2170 MHz) for full
duplex communications where uplink e downlink work in different
bands
  5 MHz channel spacing up to 12 channels with 2x5 MHz bandwidth;
190 MHz duplexing distance for up/down links
  Multiple access technique is W-CDMA (Wideband Code Division
Multiple Access)
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
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  35 MHz unpaired bands (1900-1920 MHz and 2010-2025 MHz) for
asymmetric services, where uplink and downlink employ quite
different bit rates (usually, downlink rate is larger)
  5 MHz channel spacing up to 7 channels with 5 MHz bandwidth
  Up- and down-links share the same band in different time slots
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
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FDD (Frequency Division Duplexing) mode:
  2x30 MHz paired bands (1980-2010 MHz and 2170-2200 MHz) for full
duplex communications
  190 MHz duplexing distance for up/down links.
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
  The High Speed Downlink Packet Access (HSDPA) concept was
added to Release 5 to support higher downlink data rates
  It is mainly intended for non-real time traffic, but can also be used for
traffic with tighter delay requirements.
  Peak data rates up to 10 Mbit/s (theoretical data rate 14.4 Mbit/s)
  Reduced retransmission delays
  Improved QoS control (Node B based packet scheduler)
  Spectrally and code efficient solution
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
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typical
Rural Outdoor :
goal
144 kbps
Suburban Outdoor :384 kbps
Indoor/Close Outdoor : 2 Mbps
max mobile speed
384 kbps
512 kbps120 km/ h
10 km/h
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
500 km/h
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Nec
e606
R. Cusani, Comunicazioni Mobili 2, Marzo 2009
  Need for universal standard (Universal Mobile Telecomm. System)
  Support for packet data services
⇒ IP data in core network
⇒ Wireless IP
  New services in mobile multimedia need faster data transmission and
flexible utilization of the spectrum
  FDMA and TDMA are not efficient enough
⇒ TDMA wastes time resources
⇒ FDMA wastes frequency resources
  CDMA can exploit the whole bandwidth constantly
  Wideband CDMA selected for a radio access system for UMTS (1997)
⇒ (Actually the superiority of OFDM was not fully understood by then)
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
  Frequency plans of Europe, Japan and Korea are harmonized
  US plan is incompatible, the spectrum reserved for 3G elsewhere is
currently used for the US 2G standards
  IMT-2000 band in Europe:
⇒ FDD 2x60MHz
Expected air
interfaces and
spectrums, source:
“WCDMA for UMTS”
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
  WCDMA was studied in various research programs in the industry and
universities
  WCDMA was chosen besides ETSI also in other forums like ARIB
(Japan) as 3G technology in late 1997/early 1998.
  During 1998 parallel work proceeded in ETSI and ARIB (mainly), with
commonalities but also differences
⇒ Work was also on-going in USA and Korea
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
  At end of 1998 different standardization organizations got together and
created 3GPP, 3rd Generation Partnership Project.
⇒ 5 Founding members: ETSI, ARIB+TTC (Japan), TTA (Korea),
T1P1 (USA)
⇒ CWTS (China) joined later.
  Different companies are members through their respective
standardization organization
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
  First major milestone was Release ‘99, 12/99
⇒ Full set of specifications by 3GPP
⇒ Targeted mainly on access part of the network
  Release 4, 03/01
⇒ Core network was extended
⇒ markets jumped over Rel 4
  Release 5, 03/02
⇒ High Speed Downlink Packet Access (HSDPA)
  Release 6, end of 04/beginning of 05
⇒ High Speed Uplink Packet Access (HSUPA)
  Release 7, 06/07
⇒ Continuous Packet connectivity (improvement for e.g. VoIP),
advanced features for HSDPA (MIMO, higher order modulation)
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
3GPP Rel-99
12/99
2000
Japan
3GPP Rel 4
03/01
2001
2002
Europe
(pre
-commercial)
3GPP Rel 6
(HSUPA)
2H/04
3GPP Rel 5
(HSDPA)
03/02
2003
2004
Europe
(commercial)
3GPP Rel 7
HSPA+
06/07
2005
2006
Further
Releases
2007
HSDPA
HSUPA
(commercial)
(commercial)
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
EDGE
GSM
HSCSD
WCDMA
FDD
HSDPA/
HSUPA
GPRS
LTE
TD-CDMA
TDD HCR
HSDPA/
HSUPA
TD-SCDMA
TDD LCR
cdma2000
1XEV - DO
cdmaOne
(IS-95)
cdma2000
cdma2000
1XEV - DV
TLT-5606 Spread Spectrum Techniques / 25.4. 2008
  Graph of the technologies adopted by the wireless users worldwide:
  Over 3.5 billion wireless users worldwide
  GSM+WCDMA share currently over 88 % (www.umts-forum.org)
  CDMA share is decreasing every year
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  Over 200 million WCDMA subscribers globally (04/08)
(www.umts-forum.org)
⇒ 10 % HSDPA/HSUPA users
Million subscribers
  Number of subscribers is constantly increasing
TLT-5606 Spread Spectrum Techniques / 25.4. 2008