umts customized

8/11/2019 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

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