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GPRS : General Packet Radio System - page 8 / 20

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Networks: L17

8

Coding Schemes :

four coding schemes defined with varying degrees of error correction

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options : Forward Error Correction, CRCs, convolutional codes etc.

transmission speed varied based on the coding scheme in use

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CS-1 : 9.05kbs  - highest level of error correction

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CS-2 : 13.4kbs (equivalent to the GSM CSD bearer service)

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CS-3 : 15.6kbs

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CS-4 : 21.4bps -  least error correction

speeds number of slots allocated

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9.05kbps for 1 slot using CS-1

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172.40kbps for 8 slots using CS-4

the better the radio link, the less error correction needed

all transparent to the user

only CS-1 and CS-2 in use yet

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