Since being introduced, LTE has gained tremendous success across operators’ networks around the globe and has triggered new waves of service innovations enabling new business opportunities. New use cases and increased capacity requirements on LTE networks have driven many operators to sunset legacy 3G/2G networks as quickly as possible to make the spectrum available for LTE. Executing this strategy successfully requires that all voice services previously carried in the circuit switched domain for 3G/2G now be migrated to the packet only domain in LTE.
The benefits of having all packet-based voice services, such as VoLTE are two-fold:
1. It brings a richer customer experience by introducing new features such as EVS codec-based HD voice, Video calling, and Rich Communication Services (RCS)
2. It enables faster network technology migration by simplifying the network architecture and retiring the older technology layers.