1. Korean Intellectual Property Office – ICU seminar Ha, Jeongseok March 7, 2007 School of Engineering, Information and Communications University Wideband-CDMA

2. 2 / 24 Contents 1.Introduction  History of 3G System Development  Spectrum Allocations 2.Features of W-CDMA  W-CDMA Parameters  Support Variable Rates  Interface between Higher Layers and Physical Layers  Transport Channels  Mapping Transport Channels to Physical Channels 3.Comparisons of Physical Channel Structures in IS- 95 and W-CDMA  Physical Channel Structure of IS-95  Physical Channel Structure of W-CDMA

3. Multiple Antenna Communications Introduction History of 3G System Development3G versus 2GFeatures of 3G SystemsSpectrum AllocationsW-CDMA Parameters

4. 4 / 24 3rd Generation Systems  History of 3G System Development  1992, Word Administrative Radio Conference (WARC-92) of the International Telecommunications Union (ITU) identified 2G band for International Mobile Telephony 2000 (IMT-2000)  In North America and China, the spectrum was already occupied

5. 5 / 24 3rd Generation Systems  Spectrum Allocations

6. 6 / 24 3rd Generation Systems  3G Systems  W-CDMA: most widely adopted as a 3G system  EDGE (Enhanced Data Rate for GSM Evolution): evolution of GSM  cdma2000: update of cdmaOne (IS-95)  Features of 3G Systems  Bit rates up to 2 Mbps  Variable bit rate to offer bandwidth on demand  Multiplexing of services with different quality requirements on a single connection,  e.g. speech, video and packet data;  Delay requirements from delay-sensitive real time traffic to flexible best-effort packet data  Support QoS  Co-existence of 2G and 3G systems  Inter-system handovers for coverage enhancements and load balancing  Support of asymmetric uplink and downlink traffic  e.g. web browsing causes more loading to downlink than to uplink;  High spectrum efficiency  Co-existence of FDD and TDD modes.

7. 7 / 24 3rd Generation Systems  3G versus 2G

8. 8 / 24 3rd Generation Systems  3G versus 2G

9. 9 / 24 3rd Generation Systems  Core Networks and Services

10. 10 / 24 Features of W-CDMA W-CDMA ParametersInterface between Higher Layers and Physical LayerSupport Variable RatesTransport ChannelsMapping Transport Channels to Physical Channels

11. 11 / 24 Features of W-CDMA  W-CDMA Parameters

12. 12 / 24 Features of W-CDMA  Support Variable Rates

13. 13 / 24 Features of W-CDMA  Interface between Higher Layers and Physical Layer  Support various different type of services TFI: Transport Format Indicator, TFCI: Transport Format Combination Indicator

14. 14 / 24 Features of W-CDMA  Transport Channels  Dedicated Transport Channel: carries all the information including data and control information  Common Transport Channels, 6 Channels 1.Broadcast Channel (BCH) broadcasts information specific to the network for a given cell random access codes, access slots, TX diversity method, high TX power 2.Forward Access Channel (FACH) carries control information to terminals in the given cell. It does not use fast power control and needs inband identification to ensure their correct receipt. 3.Paging Channel (PCH) carries data relevant to the paging procedure 4.Random Access Channel (RACH) transmits control information from the terminal such as requests to setup a connection 5.Uplink Common Packet Channel (CPCH, OPTIONAL) is an extension to the RACH (reciprocal to FACH) but has fast power control, collision detection, CPCH status monitoring procedure 6.Downlink Shared Channel (DSCH, OPTIONAL) carries dedicated user data and/ or control information. It is shared by several users

15. 15 / 24 Features of W-CDMA  Mapping Transport Channels to Physical Channels High Data Rates Control Information

16. 16 / 24 Comparisons of Physical Channel Structures in IS-95 and W-CDMA Physical Channel Structure of IS-95Physical Channel Structure of W-CDMA

17. 17 / 24 Physical Channel Structure of IS-95  Downlink of IS-95

18. 18 / 24 Physical Channel Structure of IS-95  Downlink of IS-95

19. 19 / 24 Physical Channel Structure of IS-95  Uplink of IS-95

20. 20 / 24 Physical Channel Structure of W-CDMA  Uplink Modulation  Audible Interference to audio devices such as hearing-aid must be minimized due to the discontinuous transmission  In a WCDMA uplink the two dedicated physical channel are not time multiplexed but I-Q/code multiplexing is used

21. 21 / 24 Physical Channel Structure of W-CDMA  Uplink Modulation  Should be designed so that the amplifier efficiency is maximized  Low peak-to-average ratio allows better amplifier efficiency  The following is the conventional QPSK modulation and has very poor efficiency

22. 22 / 24 Physical Channel Structure of W-CDMA  Uplink Modulation: Complex Spreading

23. 23 / 24 Physical Channel Structure of W-CDMA  Uplink Modulation: Complex Spreading

24. 24 / 24 Physical Channel Structure of W-CDMA  Uplink Modulation in IS-95, Offset-QPSK