VoLTE Vs Vo5G | Difference between VoLTE and VoNR
This page compares VoLTE (Voice Over LTE) vs Vo5G (Voice Over 5G NR (New Radio)) and mentions difference between VoLTE and VoNR (Voice Over New Radio).
Introduction: Voice is used as fundamental service in cellular mobile communication systems. 1G was analog communication network which offered circuit switched voice services. CS (Circuit Switched) based voice and PS (Packet Switched) based data services are used in 2G/3G networks. 4G offered IP based services for both voice and data. IMS is a standard which defines telephony services, voice, messaging and video over IP network. Both 4G LTE and 5G NR (New Radio) offer IMS based voice over IP.
VoLTE delivers HD voice, faster call setup times and improved battery life. VoNR (Voice over 5G New Radio) delivers high speed, high bandwidth IP network connectivity and multi-service applications. VoNR is equivalent to VoLTE.
Voice calls in LTE network are serviced using various options which include CSFB (Circuit Switched Fall back), VoIP (Voice over IP), In CSFB option, voice is offloaded to 2G/3G network from main 4G LTE network. In VoIP, handsets and 4G network should be VoIP compliant otherwise OTT (over-the-top) apps are used. The final option for voice over LTE is VoLTE which used IMS entity and voice is carried as VoIP packets. SIP (Session Initiation Protocol) is the key protocol for IMS architecture. IMS services include basic and advance services viz. voice/video call, IM messaging, SMS/MMS, voice mail, self care, video conference, cloud address book, social network integration, breakout to PSTN etc.
Voice services in 5G NR network are served by adopting various options such as EPS Fall Back, Voice over eNB with 5G core (VoeLTE) and Voice over NR (VoNR).
Difference between VoLTE and Vo5G
Following table mentions comparison between VoLTE and Vo5G with respect to various system parameters.
| Parameters | VoLTE | VoNR |
|---|---|---|
| Frequency of operation | As defined by LTE radio | As defined by 5G new radio in SA (Standalone) scenario, as per LTE radio in NSA (Non Standalone) scenario |
| Core | EPC (Evolved Packet Core) | 5GC (5G core) |
| Call setup time | Fast | Faster than VoLTE due to low latency |
| Voice quality | HD voice | Better than VoLTE due to use of EVS and H.265 codecs |
| CSFB support | It supports CSFB (Circuit Switched Fall Back) to 2G/3G. | It does not support circuit switched voice calls. |
| Seamless handover to 3G | Supported | Supported using ICS (IMS centralized Service) |
Refer advantages and disadvantages of Voice over LTE and Voice over 5G NR to understand difference between VoLTE and VoNR.
5G NR Numerology | 5G NR Terminology
5G NR Control channels | 5G NR Traffic Channels | 5G NR Reference Signals and sequences
5G TECHNOLOGY RELATED LINKS
5G basic tutorial
5G Frequency Bands
5G millimeter wave tutorial
5G mm wave frame
5G millimeter wave channel sounding
5G testing and test equipments
5G network architecture
5G NR Physical layer
5G NR MAC layer
5G NR RLC layer
5G NR PDCP layer
Advantages and Disadvantages of other wireless technologies
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