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1、TD-SCDMA,吴伟民 电子与信息工程系 ,1,TD-SCDMA,Evolution Path,TD-SCDMA: Frequency Band,TD-SCDMA Vs W-CDMA,System Paramters,Frame Structure,Physical Channels,Synchronization Channels Downlink Synchronization Uplink Synchronization Multiplexing Channels Joint Detection Baton Handover N-Frequency Cell,TD-SCDMA Evol
2、ution Path 3GPP,LCR TDD （R4）,LCR TDD （R5）,LCR TDD (R6),LCR TDD (R7),LTE TDD,CCSA China Communications Standards,TD-SCDMA Stage III （R7）,OFDM/SC-FDMA,Association,TD-SCDMA Stage I （R4 2003/03） N Frequency Cell,TD-SCDMA Stage II （R5） Multi-carrier,Standardization,2006,Short Term Evolution 2008,Long Ter
3、m Evolution,TD-SCDMA: Frequency Band,1755 1785,1850 1880,1920,1980 2010 2025,2110,2170 2300,2400,Satellite,Satellite,30 MHz,60 MHz,40 MHz,15 MHz,100 MHz,FDD,TDD,TD-SCDMA Vs W-CDMA,Code C3 C2,Frequency,User 3 User 2 User 1,C1,CDMA,Time,1 user W-CDMA,1 Code,Spreading Factor Max,512 Codes,TD-SCDMA,Spre
4、ading Factor Max,16 Codes,TD SCDMA Vs W-CDMA,code,time,User 1,User 2,W-CDMA,UL,DL,frequency,5 MHz,190 MHz code,time 16code,TD-SCDMA,frequency,can be used,TD SCDMA Vs W-CDMA,3 simultaneous technologies,TD SCDMA Vs W-CDMA,Avantages of TD-SCDMA:, Efficient spectrum allocation, Support for asymmetric tr
5、affic and services, Equivalent Channel in the Uplink and Downlink (Fading and multi-path ) Elimination of intra-cell and inter-cell interference. Low power consumption Baton handover, Low cost for the RF front end,Disdavantages of TD-SCDMA:, Requires accurate synchronization,Limited support for high
6、 speed/mobility users Complex and expensive technologies,7,TD SCDMA System Parameters,Parameter Carrier bandwidth Carrier spacing Chip rate Duplex type Multiple access scheme Frame length Number of slots/sub-frames Radio frame length Radio-subframe length Data modulation Voice data rate Receiver Spr
7、eading factors Max data rate per user (theoretical) Synchronization Antenna processing,Value 1.6 MHz 1.6 MHz 1.28 Mcps TDD TDMA, CDMA, FDMA 10 ms 10 ms 5 ms QPSK or 8-PSK 8 Kbit/s Joint detector (rake in UE) 1, 2, 4, 8 and 16 2 Mbps Downlink and uplink Smart antenna with beam forming,TD SCDMA: Frame
8、 Structure Chip rate: 1.28 Mcps,10ms Radio frame #i 5ms,Radio frame #i+1 5ms,Bandwidth: 1.6 MHz Modulation: QPSK/8PSK/16QAM Duplex: TDD DwPTS : Downlink Pilot TimeSlot (96 chips),Sub-frame #1 Sub-frame #2,UpPTS : Uplink Pilot TimeSlot (160 chips),DwPTS GP1,UpPTS,TS0,TS1,TS2,TS3,TS4,TS5,TS6,352 chips
9、 Data 1,144 chips Midamble,352 chips Data 2,GP3,16 chips,First Switch Point: GP1 (96 chips), Second Switch Point: after TS1,DL,UL,UL/DL,GP,GP,16,CP,-,-,TD SCDMA: Physical Channel DPCH: Dedicated Physical Channel, Rec 25.221 5A.2 Burst structure of the traffic burst format,Data symbols 352 chips,Mida
10、mble 144 chips,Data symbols 352 chips,864*Tc 16 SF= 16 code channel per timeslot per Carrier,Spreading factor (Q) 1 2 4 8 16,Number of symbols (N) per data field in Burst 352 176 88 44 22,The contents of the traffic burst format fields,Chip number (CN) 0-351 352-495 496-847 848-863,Length of field i
11、n chips 352 144 352 16,Length of field in symbols cf table 8A cf table 8A,Contents of field Data symbols Midamble Data symbols Guard period,1,st,2,3,P,P,3,1,st,rd,P,P,TD SCDMA: Physical Channel DPCH: Transmission of TFCI, Rec 25.221 5A.2.2.1 Position of the TFCI code word in the traffic burst in cas
12、e of no TPC and SS,part of,TFCI code word,nd,part of,TFCI code word,rd,part of,TFCI code word,4 th part of,TFCI code word,G,G,Data symbols,Midamble,Data symbols,Data symbols,Midamble,Data symbols,Time slot x (864 Chips) Sub-frame 5ms,Time slot x (864 Chips) Sub-frame 5ms,Radio Frame 10ms Position of
13、 the TFCI code word in the traffic burst in case of TPC and SS,part of TFCI code word,SS,TPC symbols,symbols 2 nd part of TFCI code word,part of TFCI code word SS symbols,TPC,symbols 4 th part of TFCI code word,G,G,Data symbols,Midamble,Data symbols,Data symbols,Midamble,Data symbols,Time slot x (86
14、4 Chips),Time slot x,(864 Chips),Sub-frame 5ms,Radio Frame 10ms,Sub-frame 5ms,GP,0,1,TD SCDMA: Physical Channel DPCH: Transmission of TPC / SS, Rec 25.221 5A.2.2.2 Position of TPC information in the traffic burst in downlink and uplink,SS symbol(s),TPC symbol(s),Data symbols,Midamble,Data symbols,14
15、4 chips 864 Chips Coding of the SS for QPSK,TPC Bit Pattern for BPSK,SS Bits,SS command,Meaning,bTPC,TPC,Meaning,00,Down,Decrease synchronisation shift by k/8,command,Tc,Down Up,Decrease Tx Power Increase Tx Power,11 01,Up Do nothing,Increase synchronisation shift by k/8 Tc No change,TPC Bit Pattern
16、 for 8PSK,Coding of the SS for 8PSK,TPC Bits 000 110,TPC command Down Up,Meaning Decrease Tx Power Increase Tx Power,SS Bits 000,SS command Down,Meaning Decrease synchronisation shift by k/8 Tc,110 011,Up Do nothing,Increase synchronisation shift by k/8 Tc No change,The SS is utilised to command a timing adjustment by (k/8) Tc each M sub-frames, where Tc is the chip period. The k and M values are signalled by the network.,field(1),TD
