ZTE and Germany's E Plus have announced that they are cooperating on the deployment of an IMS (IP multimedia services) based core network infrastructure. This will be the basis for a commercial voice over LTE (VoLTE) service in the E Plus network.
Since 2013, when large-scale commercial LTE networks began to be established all around the world, the question of how to launch 4G voice services has been important to all major operators. By using 4G LTE's high-speed mobile communications technology, VoLTE provides high-quality voice services for end users through the IMScore network.
With ZTE'S help, E-Plus deployed the IMS core network within only a few months and has already started testing VoLTE services for commercial use in the E-Plus network.
Compared with CSFB (circuit switched fall back) technology that makes voice calls 'fall back' to the 3G network, VoLTE aims to provide higher-quality voice services for end users and improves the user experience. In addition, the eSRVCC (enhanced single RAN voice call continuity) flow for switching voice services from the 4G IMS network to the 3G CS network ensures that when a 4G LTE user migrates from a place covered by the 4G network to a coverage hole in the 4G network, the user's voice services can be smoothly switched to the 3G network.
Christoph Bladoschewski, Department Manager Voice and Services at E-Plus, said: "It has become a tradition that E-Plus, with our strategic partner ZTE, leads the market in introducing new technologies in the core network. The introduction of IMS in such a short time is a true masterpiece by ZTE."
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