EDGE: Enhanced data rates for GSM and TDMA/136 evolution

Two of the major second-generation standards, GSM and TDMA/136,(1) have bui lt the foundation to offer a common global radio access for data services. Through use of a common physical layer, EDGE, both standards will have the same evolutionary path toward providing third-generation services. EDGE is currently subject to standardization in TIA TR45.3 and ETSI SMG, a process which will be finalized at the end of 1999. Compared to the existing data s ervices in GSM and TDMA/136, EDGE will provide significantly higher user bi t rates and spectral efficiency. EDGE can be introduced in these systems in a smooth way, using existing frequency plans of already deployed networks. This article gives the rationale behind the development of the EDGE concep t, presents the EDGE technology, and addresses performance by means of syst em simulations.