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GPRS : General Packet Radio System - page 10 / 20

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Networks: L17

10

EDGE : Enhanced Data for GSM Evolution

a method of increasing the data rates on the radio link for GSM

3-4 times increase in data speeds over GPRS claimed

different protocols and behaviour in the Base Station System

same packet handling protocols in the core network

introduces a new modulation technique and new channel coding schemes

same symbol rate but different modulation rate

»

three times as many bits as GPRS during the same period of time

»

users data rates take header sizes into account, radio data rates do not

GPRS

EDGE

Modulation

GMSK

8-PSK/GMSK

Symbol rate

270ksym/s

270ksym/s

Modulation bit rate

270kbs

810kbs

Radio data rate per time slot

22.8kbs

69.2kbs

User data rate per time slot

20kbs (CS4)

59.2kbs (MCS9)

User data rate (8 time slots)

160kbs

473.6kbs

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