Overview

UMTS (Universal Mobile Telecommunication System) the third generation mobile communication

systems

WCDMA (Wideband Code Division Multiple Access) the main third generation air interface in the

world deployment has been started in Europe and

Asia, including Japan and Korea, in the same frequency band, around 2 GHz

WCDMA was deployed also in the USA in the US frequency bands

Chapter 1： Introduction 3G air interfaces spectrum allocation time schedule main differences from 2G air interfaces

Chapter 2： UMTS Services and Applications example UMTS applications concept phones Quality of Service (QoS) classes

Chapter 3： Introduction to WCDMA principles of the WCDMA air interface,

including spreading Rake receiver power control handovers

註： Rake receiver

1. a radio receiver designed to counter the effects of multipath fading uses several "sub-receivers" each delayed

slightly in order to tune in to the individual multipath components

each component is decoded independently, but at a later stage combined in order to make the most use of the different transmission characteristics of each transmission path

2. the digital section of a CDMA receiver which permits the phone (or cell) to separate out the relevant signal from all the other signals is capable of receiving multiple signal source

s and adding them together using multiple fingers

Rake receivers are common in a wide variety of radio devices including mobile phones and wireless LAN equipment

Digitized input samples received from RF (Radio Frequency) front-end circuitry

in the form of I and Q branches Code generators and correlator

perform the despreading and integration to user data symbols

Channel estimator and phase rotator channel estimator uses the pilot symbols for estimating t

he channel state which will then be removed by the phase rotator from the received symbols

Delay equliser the delay is compensated for the difference in the arrival

times of the symbols in each finger Rake combiner

sums the channel compensated symbols, thereby providing multipath diversity against fading

Matched filter used for determining and updating the current multipath

delay profile of the channel this measured and possibly averaged multipath delay pr

ofile is then used to assign the Rake fingers to the largest peaks

Chapter 4： Background and Standardization of WCDMA background to WCDMA global harmonization process and

standardization

Chapters 5–7 give a detailed presentation of the WCDMA standard

Chapter 5： Radio Access Network Architecture the architecture of the radio access network

(RAN) the interfaces within the radio access network

(RAN) between base stations and radio network controllers (RNC)

the interface between radio access network (RAN) and core network (CN)

Chapter 6： Physical Layer the physical layer (Layer 1), including

spreading modulation user data and signaling transmission the main physical layer procedures of power

control

paging transmission diversity and handover

measurements

Chapter 7： Radio Interface Protocols the radio interface protocols consisting of the data link layer (Layer 2) and

the network layer (Layer 3)

Chapters 8–12 cover the utilization of the standard and its performance

Chapter 8： Radio Network Planning the guidelines for radio network dimensioning gives an example of detailed capacity and

coverage planning covers GSM co-planning

註： WCDMA radio network dimensioning

a process through which possible configurations and the amount of network equipment are estimated, based on the operator’s requirements

Dimensioning activities include radio link budget coverage analysis capacity estimation

estimations on the amount of sites base station hardware radio network controllers (RNC) equipment at different interfaces core network elements (i.e. Circuit Switched

Domain and Packet Switched Domain Core Networks)

Chapter 9： Radio Resource Management the radio resource management algorithms that

guarantee the efficient utilization of the air interface resources and the quality of service

algorithms power control handover control admission control load control

Chapter 10： Packet Scheduling packet access and the performance of packet

protocols of WCDMA Chapter 11： High-speed Downlink Packet

Access the significant Release 5 feature High-Speed Downlink Packet Access (HSDPA)

and its performance

Chapter 12： Physical Layer Performance the coverage and capacity of the WCDMA air

interface with bit rates up to 2 Mbps Chapter 13： UTRA TDD Modes

the time division duplex (TDD) mode of the WCDMA air interface and its differences from the frequency division duplex (FDD) mode

Chapter 14： cdma2000 in addition to WCDMA, 3G services can also be

provided with EDGE or with multicarrier CDMA

EDGE is the evolution of GSM for high data rates within the GSM carrier spacing

multicarrier CDMA is the evolution of IS-95 for high data rates using three IS-95 carriers

註： Carrier

a carrier wave, or carrier is a waveform (usually sinusoidal) that is modulated (modified) to represent the information to be transmitted

this carrier wave is usually of much higher frequency than the baseband modulating signal (the signal which contains the information)