By Paul S. Cawte
Despite the introduction of LTE with its heavy focus on improved mobile broadband speeds, mobile operators still rely on voice and SMS services for a large part of their revenues (roughly 70% globally). In previous generations of mobile technology these services were explicitly supported as part of the mobile network stack, with voice bearers supported in the radio access network and SMS making use of the voice signalling mechanisms. Indeed in 2G mobile standards data was originally only supported by sending data over a nailed up voice channel (high-speed circuit switched data or HSCSD) with the native data transport mechanisms of the general packet radio service (GPRS) introduced later as part of the so called 2.5G standards and in enhanced form as EDGE with 2.75G.
With the advent of 3G mobile standards (such as UMTS) voice and data were catered for on an equal footing…
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