3G的简单介绍

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RFCD 202: Introduction to W-CDMA
Higher Capacity - about 2X IS-95, 7X GSM
Ability to Send up to 384 kbps High Speed Data while Moving
(Internet, video, multimedia, etc.)
Up to 2 Mbps Throughput for Fixed Applications
5 MHz Bandwidth is more Immune to Fading
No Accurate Base Station Synchronization Needed
Support for Hand-off To and From GSM
The 3GPP system is seen as the next generation replacement for PDC in Japan and for GSM in many parts of the world. 3GPP WCDMA offers much
greater capacity for voice relative to either PDC or GSM. In addition, it supports packet data at all of the rates required to meet the IMT-2000 goals.
This will allow many next generation applications to come to the markets currently served by GSM and PDC. One unique feature of 3GPP WCDMA is
that it requires no special synchronization between cells. Most other direct spread CDMA systems require synchronization to operate (usually relying on
GSP satellite timing information to synchronize each cell in the system). 3GPP’s unsynchronized nature makes placing base stations in underground
subways, inside buildings, and in tunnels much simpler. To aid in the transition from GSM, the 3GPP system provides for handoffs between GSM and
3GPP. Thus, dual mode phones will allow users to freely roam between the large areas covered by GSM and new 3GPP coverage areas.

【文件名】:071117@52RD_W-CDMA入门资料.pdf
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