Basic Parameters of WCDMA
Frequency Band : 2100 MHz
1920-1980MHz (UL) &2110-2170 MHz (DL)
Duplex Space : 190 MHz
Channel bandwidth : 5 MHz
Coding Spacing : 200 KHz (RASTER)
UARFCN Range : 10562-10838 (Total ARFCN – 276)
Duplex mode : FDD and TDD
Downlink RF channel structure : Direct spread
Chip rate& Chips : 3.84 Mcps& It is pulse of spreading spectrum n
It’s in rectangular shape of +1 & -1
Frame length : 10 ms (38400 chips) = 15Slots, & 1slot = 2650chips
Superframe : A Superframe has a duration of 720ms and consists
Of 72 radio frames. The super frame boundaries are
Defined by the System Frame Number (SFN)
Spreading modulation : Balanced QPSK (downlink)
Dual-channel QPSK (uplink)
Complex spreading circuit
Data modulation : QPSK (downlink) & BPSK (uplink)
Channel coding : Convolution (Voice) and turbo (data) codes
Coherent detection : User dedicated time multiplexed pilot (DL and UL),
Common pilot in the downlink
Channel multiplexing in downlink : Data and control channels time multiplexed
Channel multiplexing in uplink : Control and pilot channel time multiplexed
I&Q multiplexing for data and control channel
Spreading factors : 4–256 (uplink), 4–512 (uplink)
Power control : Open and fast closed loop (1.6 kHz)
Power control period : 1500Hz
Power control step size : 0.5, 1, 1.5 and 2db
Power control range
Handover : Soft HO, softer HO, Inter frequency and IRAT HO