Umts Customized
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Transcript of Umts Customized
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IMT-2000
IMT-2000 stands forIMT: International Mobile Communications
2000: the frequency range of 2000 MHz and the year 2000
In total, 17 proposals for different IMT-2000 standards were submitted by
regional SDOs to ITU in 1998. 11 proposals for terrestrial systems and 6 formobile satellite systems (MSSs).
All 3G standards have been developed by regional standard developing
organizations (SDOs).
All 17 proposals have been accepted by ITU as IMT-2000 standards. The
specification for the Radio Transmission Technology (RTT) was released at the
end of 1999.
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IMT-2000
The (IMT-2000), consists of 3 operating modes based on CodeDivision Multiple Access (CDMA) technology.
3G CDMA modes are most commonly known as:
CDMA2000,
WCDMA (called UMTS) and
TD-SCDMA
(Time Division-Synchronous Code Division Multiple Access)
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High-Speed Packet Data Services
2 Mbps in fixed or in-building environments (veryshort distances, in the order of metres)
384 kbps in pedestrian or urban environments
144 kbps in wide area mobile environments
Variable data rates in large geographic area systems(satellite)
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Network Elements from UMTS
UMTS differs from GSM Phase 2+ (GSM +GPRS) mostly in the new
principles for the air interface transmission
WCDMA instead of TDMA/FDMA
Therefore a new RAN (Radio Access Network) called:
UTRAN (UMTS Terrestrial Radio Access Network)
must be introduced with UMTS
Only minor modifications are needed in the CN (Core Network) to
accommodate the change
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UMTS:1. UMTS will be compatible with 2G systems
2. UMTS will use the same frequency spectrum
everywhere in the world
3. UMTS will be a global system
4. UMTS will provide multimedia and internet services
5. UMTS will provide QoS guarantees.
6. Circuit and packet switched bearers
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Handover
Seamless handover between cells of one operator
Efficient handover between UMTS and 2ndgeneration
Compatibility with fixed network services
ATM bearer services
GSM services
IP based services
B/N-ISDN services
Facilities for quality of service provision
Private and residential operators
High spectrum efficiency
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Coverage/Capacity
provide variety of initial coverage/capacity configurationsFlexible use of various cell types and relations between cells
Ability to provide cost effective coverage in rural areas
Viability of mobile terminals
Reasonable network cost and complexity
Variety of mobile terminal/station types
Security
Compatibility with IMT2000
Coexistence with other systems
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UTRA: UMTS Terrestrial Radio Access
The most significant change in REL. 99 was the UTRAN,
a W-CDMA radio interface for land-based communications.
UTRAN supports time (TDD) and frequency division duplex (FDD).
The TDD mode is optimized for public micro and pico cells andunlicensed cordless applications.
The FDD mode is optimized for wide-area coverage, i.e. public
macro and micro cells.
Both modes offer flexible and dynamic data rates up to 2 Mbps.
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Release 99Major RAN releaseMarch 2000
New radio interface WCDMA
New RAN architecture
New CN-AC interface Open Service architecture for services
GSM-UMTS Internetworking
Release 4Minor releaseMarch 2001
UTRAN access with QoS enhancements CS domain evolution, MSC servers and MGWs, based on IP
protocols
IP Header Compression
Location services enhancements, MMS, WAP..
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Release 5Major core network releaseMarch 2002
IP Multimedia Services Subsystems
Session Initiation Protocol (SIP) signalling,
registration, session initiation, IMS security architecture
Usage of Internet Engineering Task Force (IETF)
protocols (IPv6, SIP)
SIP-based service environemtn
QoS for IMS WCDMA enhancements (IP transport)
Release 6IMS Part IIDec 2003
IP Multimedia Subsystem (IMS) Phase 2
Optimized voice communications
Presence, Instant Messaging, Group Management
Conferencing
UMTS/VLAN(virtual local area network) inter-
working
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GSM Architecture / GSM Radio
Localareanetwork
Server
Router
Localareanetwork
Server
Router
Corporate 2
Corporate 1
Intra-PLMNbackbonenetwork(IP based)
Serving GPRSSupport Node(SGSN)
Gateway GPRSSupport Node(GGSN)
GPRSINFRASTRUCTURE
HLR/AuC
MSC
BSCBTS Packet
networkPSTN
PacketnetworkSS7Network
Packetnetwork
Datanetwork(Internet)
Packetnetwork
Inter-PLMNBackbonenetwork
BorderGateway (BG)
Gb
Gr Gd
Gi.IP
Firewall
Firewall
Um
SMS-GMSC
Gr Gd
Gs
Gs
Gp
Gn
Gn
EIR
MAP-F
A
Gc
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UMTS Architecture / WCDMA
Localareanetwork
Server
Router
Localareanetwork
Server
Router
Corporate 2
Corporate 1
Intra-PLMNbackbonenetwork(IP based)
Serving GPRSSupport Node(SGSN)
Gateway GPRSSupport Node(GGSN)
GPRSINFRASTRUCTURE
HLR/AuC
MSC
RNCNode B Packet
networkPSTN
PacketnetworkSS7Network
Packetnetwork
Datanetwork(Internet)
Packetnetwork
Inter-PLMNBackbonenetwork
BorderGateway (BG)
Iu
Gr Gd
Gi.IP
Firewall
Firewall
Uu
SMS-GMSC
Gr Gd
Gs
Gs
Gp
Gn
Gn
EIR
MAP-F
Iu
Gc
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The Serving GPRS Support Node (SGSN)
Mobility Management
Authentication
Gathers Charging Information Gateway GPRS Support Node (GGSN)
Gateway between UMTS Core Network and external networks
Address allocation for MS
Gathers Charging Information Filtering
Base Station Subsystem (BSS) / Radio Network Subsystem (RNS)
BSS BSC
BTS
RNS RNC
Node-B
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UTRANTwo new network elements
are introduced in UTRAN
RNC
Node B
UTRAN is subdivided
into individual radio
network systems (RNSs),
where each RNS is
controlled by an RNC.
The RNC is connected to
a set of Node B elements,
each of which can serve
one or several cells.
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UTRAN architecture
UTRAN comprises several RNSs
Node B can support FDD or TDD
or both
RNC is responsible for handover
decisions requiring signaling to theUE
Cell offers FDD or TDD
RNC: Radio Network Controller
RNS: Radio Network SubsystemNode B
Node B
RNC
Iub
Node B
UE1
RNS
CN
Node B
Node B
RNC
Iub
Node B
RNS
Iur
Node B
UE2
UE3
Iu
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UTRAN functions
Admission control
Congestion control
Radio channel encryption
Handover
Radio network configuration
Channel quality measurements
Radio resource control
Data transmission over the radio interface
Outer loop power control (FDD and TDD)
Channel coding
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Core network
BTS
Node B
BSC
Abis
BTS
BSS
MSC
Node B
Node B
RNC
Iub
Node B
RNS
Node BSGSN GGSN
GMSC
HLR
VLR
IuPS
IuCS
Iu
CN
EIR
GnGi
PSTN
AuC
The Core Network (CN) and the Interface Iu, are separated into two logical domains:
Circuit Switched Domain (CSD)Circuit switched service incl. signaling
Resource reservation at connection setup
GSM components (MSC, GMSC, VLR)
IuCS
Packet Switched Domain (PSD) GPRS components (SGSN, GGSN)
IuPS
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A case of 3 cell repetitions
Frequency Allocation
f1
f1f1 f1
f1f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1
f1f2 f2
f3f1
f1
f3
f2
f1
f3
f1
f3
f2
f2
f1
f3
f3
f2
f3
f2
FDMA / TDMA CDMA
Same frequency in all cells.
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UTRA W-CDMA Radio Interface
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Channel bandwidth :5MHz (10Mhz, 20Mhz)
Chip rate : 3.84Mchip/s
Frame length :10ms
Channelisation spreading :variable spreading
Data modulation :QPSK(downlink), BPSK (uplink)
Spreading modulation :Balanced QPSK (downlink)
Dual-channel QPSK (uplink)
Spreading factors :4256
Handover :Soft handoverI t f h d