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  WCDMA (UMTS)   TDCDMA   CDMA2000   WCDMA (DoCoMo)   TD-SCDMA
  Mobiles   Bluetooth   HomeRF/SWAP   WAP   GPRS, HSCSD   EDGE   CAMEL, IN


TDCDMA

UTRA TDD is planned to operate in the unpaired spectrum. TDD uses a combined time division and code division multiple access scheme. It is base on radio access technique proposed by ETSI Delta group and the specifications was finalised 1999.



TDD Technical Summary

Frequency band:1900 MHz -1920 MHz and 2010 MHz - 2025 MHz (Time Division Duplex) Unpaired, channel spacing is 5 MHz and raster is 200 kHz. Tx and Rx are not separated in frequency, but by guard period.
Minimum frequency band required: ~ 5MHz, ~ 1.6MHz with 1.28 Mcps
Frequency re-use: 1
Voice coding: AMR (and GSM EFR) codec
Channel coding: Convolutional coding, Turbo code for high rate data
TDMA frame consist of 15 timeslots
Each time slot can be transmit of receive
Duplexer not needed
Asymmetric connection supported
Data by packet and circuit switch
QPSK modulation
Receiver: Joint Detection, (mobile: Rake)
Chip rate: 3.84 Mcps or 1.28 Mcps
Channel raster: 200 kHz
Maximum RF ch bit rate (kbps): ~ 3.3Mbps (1/2 rate coding, spreading factor 1, 15 timeslots, ex overheads), but interference limited
Frame length: 10ms
Number of slots / frame: 15
Handovers: Hard
Power control period: 100 Hz or 200 Hz UL, ~ 800 Hz DL
Power control step size: 1, 2, 3 dB (Variable)
Power control range: UL 65dB, DL 30dB
Mobile peak power: Power class 1: +33 dBm (+1dB/-3dB) = 2W; class 2 +27 dBm, class 3 +24 dBm, class 4 +21 dBm
Number of unique base station identification codes: 512/frequency
Physical layer spreading factors: 1, 2, 4, 8, 16


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