Written by: Anders Furuskär, Jonas Näslund and Håkan Olofsson

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The use of high-level modulation to provide enhanced data rates for GSM evolution is currently being standardized for GSM by the European Telecommunications Standards Institute. Likewise, Edge is being adopted for TDMA/136 evolution by the Universal Wireless Communications Consortium.

The authors describe the architecture and equipment-related modifications that are needed for introducing Edge into a GSM or TDMA system, and explain how the Edge concept affects radio-network planning. They also describe an evaluation of system performance.

[First published in Ericsson Review no. 01, 1999]