Mobile Communications Technology

GSM

• Voice Service, SMS
• Circuit Switched,
• TDMA Interface with GMSK Modulation and 8 Time Slots per 200KHz channel.
• Data Rates up to 9,6 Kbits/s

HSCSD

• Based on GSM Interface
• Circuit Switched Core Network
• Data Rates up to 57.6 Kbit/s

GPRS

• HSCSD, Based on GSM Air Interface
• Data Rates up to 171.2 Kbit/s

EDGE

• Definition based on GSM Air Interface. Besides GSMK Modulation now also 8-PSK Modulation
• Enhanced Packet Switch Data(EPSD)
• Enhanced Generalized Packet
• Data Rates up to 473.6 Kbit/s

UMTS

• NCDMA Air Interface
• WCDMA for FDD, Time Division/CDMA >TDD
• GSM, Circuit Switch, GPRS and Packet Switch Networks
• Data Rates standard up to Mbit/s

Evolution of Mobile Systems

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