1. WCDMA AND WLAN FOR 3G AND BEYOND 通訊所 研二 691430042 楊川民

2. Outline Introduction Glossary UTRAN FDD Mode: WCDMA UTRAN TDD Mode: TD/CDMA WCDMA Evolution From 2G to 3G Three Phases From Release 99 and Release 4 to Beyond 3G Conclusion

3. Introduction

4. Glossary FDD: Frequency Division Duplexing WCDMA: Wideband Code Division Multiple Access TDD: Time Division Duplexing TD/CDMA: Time Division / Code Division Multiple Access GSM: Global System for Mobile Communications 3GPP: Third Generation Project Partnership HSDPA: High Speed Downlink Packet Access HS-DSCH: High Speed Downlink Shared Channel UMTS: Universal Mobile Telecommunications System

5. UTRAN FDD Mode: WCDMA

6. UTRAN FDD Mode: WCDMA (cont.) Figure 2.1 illustrates some of the UTRA Frequency Division Duplexing (FDD) characteristics. This mode uses Wide-band Direct-Sequence Code Division Multiple Access (DS-CDMA), denoted WCDMA. To support bit rates up to 2 Mbps, it utilizes a variable spreading factor and multi-code links.

7. UTRAN TDD Mode: TD/CDMA

8. UTRAN TDD Mode: TD/CDMA (cont.) The 2nd UTRA mode results from the combination of TDMA – FDMA and exploits spreading as part of its CDMA component It operates in Time Division Duplexing (TDD) using the same frequency channel In this mode, the MSs can only access a Frequency Division Multiplexing (FDM) channel at specific times and only for a specific period of time Hence, in the TDD mode we define a physical channel by a code, one TS, and one frequency, where each TS can be assigned to either the uplink or the downlink depending on the demand

9. WCDMA Evolution From 2G to 3G WCDMA  support of multiple simultaneous service  Higher data rate than GSM GSM  Not support of multiple simultaneous service  evolution parallel with WCDMA

10. Three Phases From Release 99 and Release 4 to Beyond 3G Phase 1: High-Speed Downlink Packet Access (complete in 2001)  HS-DSCH, inherit many of the features of the DSCH defined in release 99 Main proposed technical enhancement  Adaptive Modulation and Coding (AMC)  Fast Hybrid Automatic Repeat Request (FHARQ)  Fast Cell Selection (FCS)  HSDPA, released as part of release 4, completed in release 5

11. Three Phases From Release 99 and Release 4 to Beyond 3G (Cont.) Phase 2: Uplink High-Speed Data, High-Speed Access for TDD (not approved)  Emphasis air interface optimization in the area of downlink high-data-rate support and attention uplink Phase 3: Capacity Improvements in Uplink and Downlink, and Further Data Rate Enhancement (not approved)  Some of the foreseen air interface technologies become mature in a timeframe that may be unacceptable for the proposed phases 1 and 2 of WCDMA development

12. Future Challenge in WCDMA and WLAN Data-intensive application need high data rate environment How spreads bandwidth in new frequency allocations How used to mobile business  Established roaming agreements for WLAN network subscriber management

13. Other Tread in the Next-Generation Mobile business need an efficient way to access corporate information systems and databases remotely through the Internet backbone Cover the demand for data-intensive applications and enable smooth online access to corporate data services in hot spots

14. Potential in WCDMA and WLAN In hot spot environments  Application and service that need high data rate In business environment  E-commerce  Fee service In UMTS and UTRAN  Used WCDMA FDD and TDD achieve larger cell size and cost saving

15. Coupling of Air Interface

16. Beyond 3G to 4G Issue in 3G evolution  It need to support IP and IP-based multimedia 4G is a revolution of the air interface rather than a new phase of evolution  They have different access method

17. The Revolution Toward 4G

18. Conclusion The WCDMA air interface is seen to develop far beyond its initial capabilities to satisfy future service and application needs No time to fine answer that can overcome the issue in 3G, we want to fine in 4G