Subject: [NEXTEL-1] Service Offerings 2.5G and 3G Wireless Packet Data Services - Computerworld

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Home > Browse Topics > Mobile & Wireless > Story

Tech Specs: Wide Area Wireless Packet Data Services

By MATT HAMBLEN

JUNE 24, 2002

2.5 and 3G Wireless

Will a new generation of wireless services deliver the speed, coverage, and reliability users want at a price they'll accept?

Faster Wireless Technology Begins Slow Debut

Road Test: Next-Generation Wireless Services

Tech Specs: Wide Area Wireless Packet Data Services

Four Evaluation Criteria for Next Generation Wireless Services

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TECHNOLOGY

ADVERTISED DATA RATE (K BIT/SEC.)

INITIAL ROLLOUT

AT&T Wireless Services Inc.

GSM/GPRS

20 to 40

June 2001

EDGE

Up to 150

June 2001

Bell Mobility

CDMA2000 1X

Up to 86

March 2002

Cingular Wireless

GSM/GPRS

20 to 40

June 2002

EDGE

Up to 150

January 2003

Nextel Communications Inc.

IDEN

30 to 50

January 2003

Sprint PCS Group

CDMA2000 1X

50 to 70

Summer 2002*

Verizon Communications

CDMA2000 1X

60 to 80

January 2002

VoiceStream Wireless Corp.

GSM/GPRS

40

November 2001

* Service will launch with nationwide coverage

All of the enhanced wide-area wireless services offer a digital, packet-switched architecture that features continuous connectivity and faster speeds. But the underlying technologies differ, which limits interoperability and could affect coverage. Those technologies include the following:

CDMA2000: The successor to the Code Division Multiple Access standard, CDMA2000 may eventually support speeds up to 2.4G bit/sec. The first generation, called CDMA2000 1x, calls for speeds up to 144K bit/sec., but vendors claim typical speeds of 50K to 80K bit/sec.

EDGE: The standard known as Enhanced Data Rates for GSM and TDMA/136 Evolution has a maximum data rate of 384K bit/ sec. Vendors claim initial end-user rates of up to 150K bit/sec.

GPRS: General Packet Radio Service is the successor to the Global System for Mobile Communications, a popular European standard. The maximum data rate is 144K bit/sec., but vendors advertise end-user speeds of 20K to 40K bit/sec.

IDEN: Nextel Communications added compression to Motorola Inc.'s Integrated Digital Enhanced Network data network service to increase the data rate to 56K bit/sec. via a new modem card. Nextel is considering offering a CDMA2000 1x service as an upgrade path.

Source: Computerworld

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