In the long term, the wireless industry is moving toward richer packet-based voice (VoIP) such as VoLTE (voice over LTE), VoIP over HSPA+ and EV-DO. VoIP will allow operators to offer much-desired rich services such as video telephony, multimedia sharing and presence during voice calls.
The move to carrier-grade VoIP will occur gradually, and it may be many years before it is fully ubiquitous. Until then, operators offering LTE devices will rely on 3G voice, a proven circuit-switched (CS) system characterized by high quality service, reliability and ubiquity and whose efficiency continues to evolve. Even after VoLTE is available, 3G voice is needed to offer voice services outside LTE coverage areas.
The evolution of voice services is aimed at increasing voice efficiency by freeing up resources for more data, enhancing quality, and delivering a richer voice experience. Qualcomm is leading this evolution on all fronts, including VoLTE, SRVCC WCDMA+ and 1X Advanced.