Give the main features of WCDMA and how are they differentiate from CDMA 2000

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written 2.8 years ago by

sourav108555 • 580

• modified 2.8 years ago

Main Features of WCDMA:

1) It supports high data rate transmission: 384 Kbps with wide area coverage, 2 Mbps with local coverage.

2) It has high service flexibility: which supports multiple parallel variable rate services on each connection.

3) It has both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) modes of operation.

4) It is built in support for future capacity and coverage enhancing technologies like adaptive antennas, advanced receiver structures, and transmitter diversity.

5) WCDMA supports inter frequency hand over and hand over to other systems, including hand over to GSM.

Comparison of cdma2000 and WCDMA based on main features:

	Cdma2000	WCDMA
Core network	ANSI-41 MAP	GSM MAP
Channel bandwidth	1.25 MHz (1X), 3.75 MHz (3X)	5.0 MHz
Chip rate	1.2288 Mcps (1X), 3.68Mcps 3x	4.096 Mcps (DOCOMO),3.84 Mcps (UMTS)
Synchronized base station	Yes	No; but synchronized BS is Optional
Multi-carrier spreading option	Yes, but in cdma2000 1X (direct spread)	No (direct spread)
Modes of operation	FDD	FDD and TDD
Voice coder	EVRC	AMR
Packet-switched core network	IETF based, PDSN/ AAA/HA/FA	GPRS based, SGSN/ GGSN
Overhead	Low (because of shared pilot,code Channel)	High (because of non-shared,pilot code Channel)

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