3G Technologies:WCDMA vs CDMA2000

3G Technologies:WCDMA vs CDMA2000

3G TECHNOLOGY3G TECHNOLOGY

THIRD GENERATION TECHNOLOGY Evolution from 2nd generation wireless technology Flexible support of mobile services

voicemessaging – email, fax, etc.medium rate multimedia – internet accesshigh rate multimedia – file transfer, videohigh rate interactive multimedia – video teleconferencing

Mobility quasi stationary to high speed platforms

Global Roamingubiquitous, seamless coverage

3G EVOLUTIONS3G EVOLUTIONS

DATA RATESDATA RATES

3G TECHNOLOGY3G TECHNOLOGY

TECHNOLOGY

GSM WDMA CDMA2000

Carrier Spacing 200 KHz 5 MHz 1.25 MHz

Reuse Factor 1 - 18 1 1

Power Control Frequency

2 Hz 1500 Hz 800 Hz

Quality Control Radio Resource Management

algorithm

Network Planning

(frequency planning)

Service Multiplexing

algorithm

Frequency Diversity

Timeslot based scheduling with

GPRS

Wideband with Rake receiver

Packet data transmitted as

short circuit switch cells

3G TECHNOLOGY3G TECHNOLOGY

TECHNOLOGY

GSM WDMA CDMA2000

Downlink Diversity Not Supported Supported Supported

Chip Rate 3.84 Mcps 1.2288 Mcps

Base Station Synchronization

asynchronous asynchronous Synchronous

Frame Duration 120 ms 10 ms 20 ms

Maximum Data Rate

384 kbps with EDGE

4.8 Mbps 2 Mbps

3G TECHNOLOGY3G TECHNOLOGY

SIMILARITIES OF WCDMA AND CDMA2000 Coherent forward and reverse link Fast power control Variable length orthogonal sequences used for DL

channelization Complex QPSK spreading Convolutional codes used as baseline Parallel turbo codes for higher data rates Variable spreading factor Soft handover and mobile assisted inter-frequency

hard handoff procedures.