An Introduction to 5G Voice over New Radio (VoNR)

As the rollout of Standalone 5G continues, operators are turning their attention to how voice services will be supported in a 5G environment. Like 4G, the answer lies in the deployment of IMS and as such, this course seeks to outline the main aspects of IMS based voice services over 5G New Radio, termed Voice over New Radio or VoNR.

The course will initially focus on setting the scent for VoNR, establishing the main concepts and drivers, including the work undertaken by the key standards bodies. Next, the course will outline the key architectural requirements for a VoNR deployment, covering the essential elements of the 5G New Radio access network, the IMS Call Control network and the Policy and Charging Control framework connecting the two. Initial procedures will then be discussed, outlining the steps a device needs to take in order to gain initial access to their voice services, including 5G access and IMS registration. Next, call establishment aspects will be examined, ranging from the codecs and media packetization used, through to a high level overview of the SIP message exchange. Finally, interworking with alternative voice networks will be covered, focussing on "legacy" voice services, as well as handovers, Wi-Fi Calling and EPS Fallback.