AirLink Communications Raven X HSDPA Betriebsanweisung PDF herunterladen (Seite 6)

Raven X HSDPA for Cingular - User Guide, version 2.33 1

CHAPTER 1 Introduction to Raven X HSDPA

FIGURE 1. Raven X front and back

HSDPA Overview

The Raven X's rugged form factor is ideal for industrial and commercial applications that require

real-time communications. The Raven X provides cellular data communications for a variety of

applications, such as primary or backup Internet connectivity, public safety, traffic control, traffic

metering, and more.

HSDPA (High-Speed Downlink Packet Access) is a cellular technology allowing for higher data

transfer speeds, up to 14.4 Mbit/s per cell in the downlink and 2 Mbit/s per cell in the uplink.

HSDPA uses Adaptive Modulation and Coding (AMC), fast packet scheduling at the Node B

(Base Station) and fast retransmissions from Node B (known as HARQ-Hybrid Automatic Repeat

Request) to deliver the improved downlink performance vs. UMTS and EDGE.

HSPDA falls back to UMTS, EDGE or GPRS (in order of precedence). This feature allows you

to have seamless connectivity no matter where your Raven X is.

UMTS (Universal Mobile Telecommunications System) supports up to 1920 kbit/s data transfer

rates, although most users can expect performance up to 384 kbit/s. A UMTS network uses a pair

of 5 MHz channels, one in the 1900 MHz range for uplink and one in the 2100 MHz range for

downlink.

EDGE (Enhanced Data rates for GSM Evolution) provides end-to-end packet data services with

an enhanced connectivity building on GPRS technology and using the established GSM net

works. EDGE provides higher transmission rates and better transmission quality for data than

GPRS. EDGE can carry data at speeds typically up to 384 kbit/s in packet mode.

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AirLink Communications Raven X HSDPA Betriebsanweisung Seite 6