1. Investigation of the Advantages of TDSCDMA compared to WCDMA Thesis Presentation7 Nov 2006 Author:Wang Ying Supervisor:Prof. Sven-Gustav Häggman Instructor:M.Sc. Mikko Nieminen

2. Agenda  Background  Objectives  Methodology  TDSCDMA physical layer structure  Key technologies used in TDSCDMA  Conclusion  Future study

3.  Background  The developing of GSM system started from early 1980’s  February 1999 Nokia Oyj completed the first WCDMA call through the public switched telephone network in the world.  There are now about 2.9 million WCDMA subscribers. Most of these are in Europe and Japan.  TDSCDMA (Time Division Synchronous Code Division Multiple Access) developed by the China Academy of Telecommunications Technology (CATT), in cooperation with Siemens. Why indeed TDSCDMA encourages Chinese government spent over 10 years' hard work?

4.  Objectives  To investigate the advantages for using TDSCDMA system compared to using WCDMA system  Methodology  Literature research  Discussion with experts

5. Network structure Iu Uu Core Network CN Radio Access Network RAN User Equipment UE

6.  Physical layer interfaces with upper layers TDSCDMA physical layer structure 1/5

7. TDSCDMA physical layer structure 2/5  Physical channel structure

8. TDSCDMA physical layer structure 3/5  Subframe structure ( ; )

9.  Tsn (n from 0 to 6): the normal time slot, 864 chips duration;  DwPTS: downlink pilot time slot, 96 chips duration;  UpPTS: uplink pilot time slot, 160 chips duration;  GP: main guard period for TDD operation, 96 chips duration;  Switching Point: between the downlink time slots and uplink time slots (vice versa ) TDSCDMA physical layer structure 4/5

10. TDSCDMA physical layer structure 5/5 Data symbols 352 chips Midamble 144 chips Data symbols 352 chips Guard period 16 chips 675 µ s Guard period 32 chips SYNC 64 chips 75 µ s SYNC1 128 chips Guard period 32 chips 125 µ s  Normal TS structure  DwPTS structure  UpPTS structure

11. Key technologies used in TDSCDMA 1/3  Combined TDD, TDMA and CDMA operation TDD: Separate Uplink and Downlink TDMA: Separate different users CDMA: Separate different users Depending on the Max. used spreading factor

12. Base Band Processor TRx 1 TRx 2... TRx M TRx 3... Antenna Array Feed Cables Key technologies used in TDSCDMA 2/3  Smart antenna Rx (Uplink): find the best Tx (Downlink): beamforming can greatly reduce the interference to other co-channel UEs also can save output power

13. Conclusion  1.6 MHz unpaired frequency band – efficient spectrum usage  TDD, TDMA and CDMA combined operation – better supporting data services  Using smart antenna – efficient suppressing interference  No cell breathing – easier network planning

14.  Study TD-SCDMA network performance  Study the disadvantage in TD-SCDMA system Future Study Thank You!

15. FDD componentTDD component Multiplex technology W-CDMATD-SCDMATD-CDMA Bandwidth 2*5 MHz paired1*1.6 MHz unpaired1*5 MHz unpaired Frequency Reuse 11 or 31 Handover Hard, Soft, SofterHard Modulation QPSKQPSK and 8-PSKQPSK Receiver RAKE Joint Detection (RAKE in mobile) Joint Detection (RAKE in mobile) Chip rate 3.84 Mcps1.28 Mcps3.84 Mcps Spreading Factor 4-2561, 2, 4, 8, 16 Power control Fast: every 667µsSlow: 200cycles/sSlow: 100cycles/s Frame structure 0.667/10ms0.675/5ms0.667/10ms Timeslots/Frame ______715 Appendix Different Radio Modes with Harmonized Parameter Sets