Ralf Keller

Ralf Keller has a PhD in Computer Science and joined Ericsson in 1996, and is today working with 5G Packet Core Architecture. He is an expert for multi-access and multi-media co-existence within Ericsson, and his work embraces technology studies and contribution to product strategies for mobile communication. This includes work on 5G System (5GS), communication services in 5G, migration to 5GS, and interworking and co-existence with legacy networks. He is also active in the GSMA, covering there 5G introduction and profiling of 5G and in the past VoLTE/ViLTE and Wi-Fi calling, including messaging, Open Market Devices, IMS / VoLTE roaming, IP Communication UNI and alignment with 3GPP.

Ralf Keller

Voice network evolution in 5G and the latest industry status

To evolve to 5G voice, there are some recommendations to pay attention to when it comes to available frequency bands and coverage build-out. The industry is still working on future network evolution aspects, so you also need to follow what happens during the coming years to enable 5G voice for your customers.

Migration from EPS Fallback to support voice in 5G

While Evolved Packet System (EPS) fallback is recommended for early 5G system deployments, support of voice in a 5G system is required sooner or later. The migration from EPS fallback to support voice in a 5G system must be as simple as possible.

Voice in 5G system—architecture and EPS fallback

To enable 5G voice in 5G devices, there are many network evolution aspects to take into consideration. 3GPP has specified the 5G system (5GS) supporting voice and other services. One aspect to look into is the 5GS architecture, before detailing how voice will be provided in 5GS.

5G voice for smartphones: Network prerequisites

Everyone is talking about 5G and what it should be used for. Everyone probably expects that a 5G mobile phone should, by default, have all the capabilities a 4G mobile phone has plus new 5G capabilities—to justify the 5G icon visible on the screen. This also includes the capability to make regular operator voice calls; otherwise, it is not really a “phone” any longer. Learn what is needed to enable 5G voice in a mobile network.