Intrduction to 3G Technology and UMTS

8/8/2019 Intrduction to 3G Technology and UMTS

1/30

INTRDUCTION TO 3G

TECHNOLOGY AND UMTS


2/30

THIRD GENERATION (3G) MOBILE

SYSTEMS

The objective of 3G is to provide high-speedwireless communications to support multimedia,data and video in addition to voice

IMT-2000 defined the view of 3G system capabilities


3/30

IMT-2000 3G SYSTEM

REQUIREMENTS

Voice quality comparable to the PSTN

144Kbps data rate available to fast-moving users

384Kbps to pedestrians

2084Kbps for office use Support for both packet-switched and circuit-

switched data services

An adaptive interface to the Internet

Support for wide variety of mobile equipment

Flexibility to allow the introduction of new services

and technologies


4/30

UMTS

3 G (telephony , paging, messaging, Internet , broadband data)Universal Mobile Telecommunication System

FDD and TDD bands

GSM Combatable

QoS

44 kbits/s satellite and rural outdoor

384 kbits/s urban outdoor2048 kbits/s indoor and low range outdoor

Four types of QoS classes:

Conversational class (voice, video telephony, video gaming)Streaming class (multimedia, video on demand, webcast)Interactive class (web browsing, network gaming, database access)

Background class (email, SMS, downloading)


5/30

UMTS

Basic

Architecture


6/30

UMTS REFERENCEARCHITECTURE

UMTS Terrestrial Radio Access Network (UTRAN)

Handles all radio-related functions

Core Network (CN)

Switching and routing of calls and dataconnections to external networks

Enhanced GSM technology

User Equipment (UE)

Interfaces the user and radio equipmentNew technology


7/30

UTRAN

UTRAN consists of two components

Base stationNodeBcommunicates with themobile devices over the air.

In cities base stations have typically 1km radius,

typically split into two or three sectorscells Base stations connected to the network using

2Mbps linksE1 called T1. This links can beover copper cable, optical fibre, ADSL/VDSL or

Microwave Node B is similar to BTS in GSM

Each node B can control several antennas whichmake a radio cell

Radio Network Controller RNC


8/30

UTRAN

ARCHITECTURE

UTRAN comprises severalRNSs

Node B can support FDD or TDD

or both

RNC is responsible for

handover decisions requiringsignaling to the UE


9/30

THE RNC

Establishes radio connection

Selects connection propertiesbandwidth,

type, QoS requirements, subscription options etc.

Mobility managementhandover controlbetween cells and between base stations

Overload control

the RNC can block new connection

establishment requests, or can reduce thebandwidth of established connections


10/30

CORE NETWORK

The Core Network (CN) is separated into two

logical domains:

Circuit Switched Domain (CSD)

Circuit switched service incl. signalingResource reservation at connection setup

GSM components (MSC, VLR)

Packet Switched Domain (PSD)

GPRS components (SGSN, GGSN)


11/30

PACKET-SWITCHED CORE NETWORK

The RNC connects to both the circuit-switched corenetwork and to the packet-switch core network

Before a mobile device can exchange data with an

external PS network, the mobile devices has to Attach

to the PS core network and perform authenticationprocedure

request an IP address from the PS network:

this is referred to as establishing a PDP context

Packet Data Protocol

The SGSN is responsible for subscriber and mobilitymanagement

The SGSN keeps track of user locations and routesIP packets accordingly


12/30

THE MOBILE SWITCHING CENTRE MSC

In UMTS there are two independent core network

entities: the MSC and the SGSN

The MSC handles voice and video calls and

forwards SMS messages via the radio network

Manages users of the networks in its region

Establishes circuit-switched channels for

incoming / outgoing calls

Mobile devices need to register with the MSC,bysending their IMSI numbers


13/30

W-CDMAAND CDMA2000

CDMA2000 uses multicarrier CDMA to increase thecapacity

CDMA2000 proposes multiples of 1.2288Mchips/sec(WCDMA employs 3.84Mchip/sec)

W-CDMA increases the bit rate and thus the powerand attempts to maximise the capacity by controllingthe power

Different applications require different bit errorrates,which means different power levels

In CDMA2000 Base stations operate synchronouslyby obtaining timing from GPS, while in W-CDMAoperation is asynchronous

The frame length in W-CDMA is 10ms, in CDMA2000is 20ms


14/30

WCDMA

Wideband Direct Sequence Technology

Bandwidth 5MHz

IMT-2000

Data Rate 385 kbps wide area coverage 2 Mbps for local coverage


15/30

UMTS DEFINED NEW INTERFACES

Uu: Mobile Terminal to Node B(W-CDMA

air Interface)

Iub: Node B to RNC

Iu: RNC to Core Network IuCS: RNC to MSC circuite switch interface

IuPS: RNC to SGSN

Iur: RNC to RNC (new interface of UMTS)

___Iur defined so all resourse management func.Performed in RNS without CN.

___Iub,Iu,Iur use ATM Protocol for data exchange

b/w connected elements.


16/30

DOWNLINKOVERHEAD CHANNELS

Common Pilot Channel (CPICH)

__ used to transmite timing and frequency Ref. To UE__TO Find primary scrambling Code

__To Determine the transmit power during openloop PC.

Sync. Channel(SCH)

___Multiplexed with (P-CCPCH)

___Contains Primary and Secondary Syc Ch.

___Allow UE to Synchronize with Base station

Primary Common Control Physical Channel (P-

CCPCH)___transmite BCH (Provide system information to UE)

___Multiplexed with SCH(Sycn. UE to Network)

___In test Operating Mode it contains Psuedo-randombit sequence data and valid system frame number


17/30

UMTS ADED SECURITY

The main security elements that are fromGSM

Authentication of subscribers

Subscriber identity confidentially

Subscriber Identity Module (SIM) to beremovable from terminal hardware

Radio interface encryption

Additional UMTS security features

Security against using false base stations withmutual authentication

Encryption extended from air interface only toinclude Node-B to RNC connection


18/30

OPNET

Main Features of OPNET.Powerful Simulation tool

Development work was started in 1986 by MIL3, Inc., for military

while nowadays OPNET Technologies, Inc.

Predefined libraries and Protocols.

OPNET modelling hierarchyNETWORKDOMAIN

NODE DOMAIN

PROCESS DOMAIN

SIMULATIONS &ANALYSIS


19/30

OPNET

OPNETObject

palette


20/30


21/30


22/30


23/30

OPNET

UMTSNetwork

In

OPNET


24/30

SCNERIO 1


25/30

OPNET


26/30

SCNERIO 2


27/30

OPNET


28/30

SCNERIO 3


29/30

OPNET


30/30

HUAWEI VS UMTS

Latin America's First UMTS Network is

Constructed by Huawei

After one year of testing, ANTEL purchases the

UMTS equipments from Huawei. Huawei

provides the HSDPA-based end-to-end UMTS

solution for ANTEL.

Intrduction to 3G Technology and UMTS

Documents

Transcript of Intrduction to 3G Technology and UMTS