The cellular industry has been prioritizing broadband data over traditional phone calls since the 4G era. Many of the CSPs across the world are still using CSFB (Circuit-switched Fallback) when it comes to traditional phone calls. CSFB allows the LTE network to automatically switch to a circuit-switched network like 3G or 2G when a phone call or SMS is there. This has led to comparatively delayed and uncoordinated launches of VoLTE (Voice over LTE) service. VoNR (Voice over New Radio) is the answer of 5G to high-quality and crystal-clear and voice and video calls. Just like VoLTE, VoNR will solely rely on packet-switched 5G network for voice and video calls. VoNR also offers significantly lower latency for calls.
As per a recent press-release from Oppo, the company has used Mediatek’s Dimensity 1000 SoC for VoNR testing with Reno3 5G phone. The modified version of the device was used for testing. This test was conducted in a 5G SA (standalone) network environment in collaboration with Ericsson. As per the observations mentioned in the press release, the two phones connected ‘almost instantly’ after dialing and switched with the high-definition video quality with a single tap.
While the VoNR functionality is currently limited to Mediatek Dimensity 1000 chip, Qualcomm has plans to support VoNR in its third-generation 5G modem – Snapdragon X60 with devices launching around 2021.