Voice over Long-Term Evolution (VoLTE) is a standard for high-speed wireless communication for mobile phones and data terminals. It is based on the IP Multimedia Subsystem(IMS) network, with specific profiles for control and media plans of voice service on LTE defined by GSMA in PRD IR.92.
Originally LTE was seen as a completely IP cellular system just for carrying data, and operators would be able to carry voice either by reverting to 2G / 3G systems or by using VoIP in one form or another.
VoLTE allows voice calls to be ‘packaged’ and carried through LTE networks. This would mean 4G data accessibility even during calls.
The implementation of VoLTE offers many benefits, both in terms of cost and operation. VoLTE:
• Provides a more efficient use of spectrum than traditional voice;
• Meets the rising demand for richer, more reliable services;
• Eliminates the need to have voice on one network and data on another;
• Unlocks new revenue potential, utilising IMS as the common service platform;
• Can be deployed in parallel with video calls over LTE and RCS multimedia services, including video share, multimedia messaging, chat and file transfer;
• Ensures that video services are fully interoperable across the operator community, just as voice services are, as demand for video calls grows;
• Increases handset battery life by 40 per cent (compared with VoIP);
• Delivers an unusually clear calling experience; and
• Provides rapid call establishment time.