Abstract
New mobile data services are being introduced to GSM system. High Speed Circuit Switched
Data (HSCSD) and General Packet Radio Service (GPRS) are the first steps towards higher
data speeds over GSM. Standardisation of HSCSD began during 1994, and first networks
supporting HSCSD were commercially available at the end of 1998. HSCSD enables circuit
switched data transfer over GSM system. The standardisation work on the GPRS Phase1 was
officially finalised in the first quarter of 1998 at ETSI and the standardisation work on the
GPRS Phase2 is still going. GPRS enables packet switched data transfer over GSM system.
This paper presents first generally a preliminary network planning process for GSM speech.
After that the characteristics of HSCSD and GPRS services are presented and the things related
to their capacity calculation are discussed.
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