Advantages of Voice Over 5G New Radio (Vo5G) | Disadvantages of VoNR
This page covers advantages and disadvantages of Voice Over 5G New Radio. It mentions benefits or advantages of Vo5G and drawbacks or disadvantages of VoNR.
Introduction: 5G NR (New Radio) specifications are categorized into NSA (Non-Standalone) and SA (Standalone). 5G NR NSA and SA specifications are released in Dec. 2017 and June 2018 respectively. Data services drive the evolution of 5G NR (New Radio). Inspite of this, voice and video services are very essential for the growth of 5G cellular service like 4G LTE and its predecessors 3G/2G.
What is Voice over 5G NR ?
4G uses LTE as radio access technology and 5G uses NR as radio access technology. Voice/video services over LTE network and 5G network are known as VoLTE and VoNR respectively. Both of them use different access modes for IMS voice/video services.
As per 3GPP, 5G must provide voice & video communication services based on IMS. IMS must be installed for VoNR (Voice over NR), VoLTE (Voice over LTE), EPS fallback, and RAT Fallback in 3GPP Release 15 or 5G to 3G SRVCC (Single Radio Voice Call Continuity) in 3GPP Release 16.
5G voice services are provided using 5G RAN (Radio Access Network), 5GC (5G Core) and IMS (IP Multimedia Subsystem). IMS takes care of management of VoNR calls including setup, maintenance and release of calls. SIP (Session Initiation Protocol) is used for signalling between UE and IMS. The other requirement for VoNR is UE PDCP should support RTP/RTCP and RoHC compression where as MAC layer should support DRX mode. VoNR uses QoS flows with 5QI=5 (called non-GBR) and 5QI=1 (called GBR). Non-GBR (i.e. 5QI=5) is used for SIP signaling messages with high priority to meet low latency requirements. 5G NR gNB (i.e. 5G base station) uses RLC-AM mode DRB for SIP signalling and RLC UM mode for voice traffic DRBs.
Following are the different ways voice services are supported in 5G NR (New Radio) system.
• 5G VoNR fallback to VoLTE/2G/3G in DC (Dual Connectivity) mode or NSA (Non Standalone) mode
• Interworking between VoNR and VoLTE
• Interworking between VoNR and 2G/3G
• Interworking between VoNR and VoWiFi
• Seamless Voice over NR in 5G Standalone mode (SA mode)
Benefits or advantages of Vo5G
Following are the benefits or advantages of Vo5G (Voice over 5G):
➨It supports seamless handover (HO) from 5G cell to 4G LTE cell and vice versa.
➨It uses ICS (IMS Centralized Service) which allows 3G HO and prevents call drop when 5G is not available and 3G is available.
This enables voice call continuity between 5G and 3G.
➨Voice calls are faster in 5G NR due to its low latency.
➨Voice calls are better in quality due to use of EVS and H.265 codecs compare to VoLTE.
➨Voice over NR and high speed data services are possible simultaneously.
➨It improves voice coverage in uplink direction due to dual connectivity (DC).
Voice call falls back to 4G LTE network when 5G services are not available.
Drawbacks or disadvantages of VoNR
Following are the drawbacks or disadvantages of VoNR (Voice over NR):
➨It does not support 2G/3G. Hence 5G NR does not support seamless handover to 2G/3G network.
➨It does not support circuit switched voice calls.
➨Smartphones with 5G NR (VoNR) and 4G LTE (VoLTE) are expensive.
➨It takes more time during call setup as it fallback to 4G LTE from 5G NR.
Also refer advantages and disadvantages of Voice over LTE i.e. VoLTE for more information.
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
What is Difference between
Difference between 4G and 5G
difference between OFDM and OFDMA
Difference between SC-FDMA and OFDM
Difference between SISO and MIMO
Difference between TDD and FDD
FDMA vs TDMA vs CDMA
FDM vs TDM
CDMA vs GSM