GSC: Standardization Advancing Global Communications Evolution of TD-SCDMA China Communications Standards Association (CCSA) Chicago, May 29th to 2nd June, 2006 SOURCE:CCSA TITLE:Evolution of TD-SCDMA AGENDA ITEM:Joint (06) 4.1 GSC11/JOINT(06)_15

GSC: Standardization Advancing Global Communications Main Features and Potential of TD-SCDMA System; Optimizing and Improvement; Joint Detection technique; Multiple Antenna technique; High Speed Packet Access; Multimedia Broadcast and Multicast Services; Two Stages Evolution ; Contents

GSC: Standardization Advancing Global Communications Main features TDD Duplex supporting unpaired frequency supporting asymmetric data services; same carrier frequency suitable for smart antenna FDMA+TDMA+CDMA Simple and flexible Radio Resource Management Low Chip Rate small resource unit soft radio Short Code CDMA joint detection defending MAI and ISI Self-Contained Time Slot Structure channel estimate and demodulation in a single time slot compatible technology enhancement Potential –adapt to the development of future technology; accommodate different advanced technology Main features and Potential of TD-SCDMA

GSC: Standardization Advancing Global Communications Optimizing and improvement Joint Detection technology (JD): Node B side processing UE side processing Adaptive multiple antenna technology Adaptive Array MIMO; Special Time Slot signal processing cell search random access and synchronization High Speed Packet Access HSDPA HSUPA Multimedia Broadcast and Multicast Services Simulcast Combing in the Same Timeslot Radio Resource Management Optimizing and Improvement

GSC: Standardization Advancing Global Communications JD implementation and improvement: Interference sources and system features MAI and ISI short code CDMA self-contained time slot structure JD in Node B side combining with smart antenna processing different interference JD in UE side obtain the channel assignment information active detecting simplified algorithms Advanced JD Intra-cell and Inter-cell interference improving the cell-edge performance Combining the JD and FEC Iterative JD; combining JD Joint Detection

GSC: Standardization Advancing Global Communications The smart antenna technology Expanding the concept of smart antenna, only focusing on two key points: one is the adaptive another is the multiple antenna Adaptive multiple antenna technology including: Diversity Antenna: transmit diversity and receive diversity; Beam Forming: adaptive array antenna, or smart antenna; Space Multiplexing: Multi-Input and Multi-Output; Multi-Input and Multi-Output (MIMO) Producing several parallel channel Independent data streams are transmitted on several parallel channels so that total channel capacity is increased. e.g.: 4 times data rate can be achieved by 4Tx-4Rx antenna Multiple Antenna (1)

GSC: Standardization Advancing Global Communications Adaptive array –Transmitting the same data in different antenna; –Providing directional beam, mitigating the MAI –Improving the reliability of the channel. –Adapting the radio environment of lack scatters out doors –Smaller antenna space MIMO –Transmitting independent data in different antenna –Providing space multiplex gain to increase capacity. –Adding extra parallel channels –Adapting the radio environment of rich scatters in doors –Larger antenna space Multiple Antenna (2)

GSC: Standardization Advancing Global Communications HSDPA Basic concept of HSDPA Features of Packet Data non-sensitive to delay sensitive to error burst transmission pursuing the throughput of system Packet Data Access by regulating the rate of data to adapt the change of channel condition Key techniques of HSDPA Adaptive modulation and coding (AMC) Hybrid ARQ Fast scheduling algorithm; Enhance uplink technique Similar to HSDPA, the key techniques including: AMC HARQ and Fast scheduling algorithm also be called as HSUPA High Speed Packet Access

GSC: Standardization Advancing Global Communications Simulcast Combing in the Same Timeslot Multimedia Broadcast and Multicast Services

GSC: Standardization Advancing Global Communications Basic Consideration in TD-SCDMA Evolution –Enhance performance and/or capability with sufficient consideration of backwards compatibility –Support both cellular systems (wide area environment) and hotspot services (local area environment) –Promise healthy development of TD-SCDMA industry in the near and far future Two Stages Evolution –Stage 1: Multi-Carrier TD-SCDMA Smooth evolution, better Compatibility –Stage 2: TDD OFDM based on TD-SCDMA Totally new solution, for long future of TDD Two Stages Evolution -Basic Consideration

GSC: Standardization Advancing Global Communications Multi-carriers scheme Multi-carrier scheme binds several carriers based on the current lower layer techniques to increase the data rate, which has better compatibility of the current system; Two Stages Evolution -Multi-Carrier TD-SCDMA (1)

GSC: Standardization Advancing Global Communications Basic Technologies Joint Detection Smart antenna Uplink synchronization DCA HSDPA Enhanced Technologies E-UL, HSUPA Enhanced JD, improving the cell-edge performance Multiple carriers, based on LCR MIMO, Include space multiplex & beamforming MBMS, Include macro diversity Others, … … … Two Stages Evolution -Multi-Carrier TD-SCDMA (2)

GSC: Standardization Advancing Global Communications TDD: play an important role in future more flexible in spectrum allocation Paired & Unpaired Spectrum flexibly support asymmetric services performance improved by channel symmetry TDD vs. FDD (air interface ) Burst vs. continuous transmission single continuous spectrum vs. paired spectrum guard period between DL and UL for TDD with duration determined by coverage Interference problem Cell search and synchronization common network architecture and higher layer techniques Two Stages Evolution -TDD OFDM based on TD-SCDMA (1)

GSC: Standardization Advancing Global Communications Technical aspects OFDM Based; Scalable Bandwidth MIMO, include Space multiplex and Beamforming High Speed Packet Access Frame Structure and Numerology Cell Search, Random Access, and other Procedure Inter-Cell Interference Mitigation Radio Resource Management MBMS … … … Two Stages Evolution -TDD OFDM based on TD-SCDMA (2)

GSC: Standardization Advancing Global Communications Thanks