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Overview.  UMTS (Universal Mobile Telecommunication System) the third generation mobile communication systems.

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Presentation on theme: "Overview.  UMTS (Universal Mobile Telecommunication System) the third generation mobile communication systems."— Presentation transcript:

1 Overview

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

3  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


5  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

6  Chapter 3 : Introduction to WCDMA principles of the WCDMA air interface, including  spreading  Rake receiver  power control  handovers

7 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

8 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 sources 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



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

12  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

13  Matched filter used for determining and updating the current multipath delay profile of the channel this measured and possibly averaged multipath delay profile is then used to assign the Rake fingers to the largest peaks

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

15  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)


17  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

18  paging  transmission diversity and handover measurements

19  Chapter 7 : Radio Interface Protocols the radio interface protocols consisting of the data link layer (Layer 2) and the network layer (Layer 3)


21  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

22 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

23  Dimensioning activities include radio link budget coverage analysis capacity estimation

24 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)

25  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

26  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

27  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

28  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

29 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)

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