What Is Voice over NR and How Does It Work

Voice over NR is a technology that allows for the transmission of voice communications over a network. It's a crucial component in modern telecommunications.

NR stands for New Radio, a 5G radio access technology that provides faster data speeds and lower latency. This technology is designed to support a wide range of use cases, from enhanced mobile broadband to mission-critical communications.

Voice over NR uses the NR air interface to transmit voice communications, which are then routed through a network of base stations and core network nodes. This allows for seamless voice communication between users, even in areas with limited network coverage.

The NR air interface supports a range of voice codecs, including the Adaptive Multi-Rate (AMR) and Enhanced Voice Services (EVS) codecs. These codecs enable high-quality voice communication, even in environments with poor network conditions.

For your interest: Mobile Communications over IP

Voice over NR network Architecture is consist of 5G RAN, 5G Core and IMS network, supporting Service based interface using HTPP protocol. This architecture enables seamless communication between different network components.

Suggestion: Mobile Architecture

A high level architecture is shown below, highlighting the major network functions involved. This setup allows for efficient data transmission and processing.

The VoNR call flow is very much similar to VoLTE call, consisting of five stages. It starts from detecting a 5G NR Cell and performing Registration to 5G gNB and 5GC, establishing the default PDU session with non-GBR QoS Flow with 5QI=6-9.

In a VoNR call, the overall call flow includes five stages, starting from detecting a 5G NR Cell and performing Registration to 5G gNB and 5GC.

The UE establishes a default PDU session with non-GBR QoS Flow with 5QI=6-9 and Data DNN (which is equal to APN in 4G LTE).

This is followed by establishing a default Internet PDU session with IMS DNN using non-GBR QoS Flow and 5QI=5.

The UE then performs an IMS registration process using SIP messaging over the default IMS PDU session.

A dedicated PDU session with GBR QoS Flow and 5QI=1 is established for VoNR MO/MT calls.

Voice traffic flows over this dedicated PDU session using the RTP protocol.

Curious to learn more? Check out: QoS Class Identifier

A 5G core network is required for VoNR to work. This is because VoNR relies on the 5G core network to work with the IP Multimedia Subsystem (IMS) and enable rich communications, including voice calls and SMS.

In a stand-alone deployment scenario, a dedicated 5G core network is used, allowing VoNR calls to occur independently. This is in contrast to a non-stand-alone deployment scenario, where 5G networks utilize the switching capabilities of the 4G core network, EPC.

The 5G core network is essential for VoNR to deliver all services, including voice, without relying on the 4G networks. This is a key requirement for VoNR to work effectively.

Explore further: 5g Network Deployment

Voice over NR (VoNR) is a packet-switched IP technology that requires your mobile phone to be connected to a 5G radio base station – gNodeB.

The VoNR call flow is very similar to VoLTE call flow, consisting of five stages. It starts with detecting a 5G NR Cell and performing registration to 5G gNB and 5GC.

You might like: List of 5G NR Networks

IMS (IP Multimedia Subsystem) plays a crucial role in managing VoNR call connections, including setup, maintenance, and release. IMS is used for signaling procedures between the UE (User Equipment) and IMS.

VoNR uses a QoS (Quality of Service) Flow with 5QI=5 for SIP (Session Initiation Protocol) signaling messages and QoS Flow with 5QI=1 for voice traffic. SIP is used for signaling procedures between the UE and IMS.

Here are the key components involved in VoNR:

The UE provides capability information during the NAS (Non-Access Stratum) registration procedure, indicating its support for IMS Voice service. The UE capability request includes the 'UE's Usage Setting' IE, which indicates the higher layers of the UE support the IMS Voice service.

If you're looking to learn more about 5G VoNR, there's a great resource available through the Qualcomm Wireless Academy (QWA).

The QWA offers both a VoNR technical course and an advanced workshop for wireless engineers, taught by experienced engineers from Qualcomm Technologies.

You can access these courses through the QWA's flexible eLearning format, but note that they require a company-to-company agreement to access.

To request training, you can click on the links provided or visit the QWA's website directly.

Broaden your view: 5g Radio Access Network

If you're looking to learn more about 5G technology, the Qualcomm Wireless Academy is a great resource. They offer VoNR technical training through their eLearning format, taught by experienced engineers from Qualcomm Technologies.

You can access the VoNR technical course and advanced workshop by clicking on the links provided by the QWA. The courses are flexible and can be completed at your own pace.

The VoNR technical course and advanced workshop are available to wireless engineers who have a company-to-company agreement with Qualcomm Technologies. This means you'll need to go through your company to access the training.

To learn more about the VoNR technical course and advanced workshop, you can click on the links provided or request training through the QWA website.

On a similar theme: T Mobile 5g Advanced

T-Mobile launches 5G SA network. This marked a significant milestone in the rollout of 5G services in the US.

T-Mobile's 5G SA network uses standalone architecture, which is a key feature of 5G technology. This architecture allows for greater flexibility and scalability.

Take a look at this: 5g Network T Mobile

The launch of T-Mobile's 5G SA network is part of a broader trend of carriers upgrading their networks to support 5G services. This trend is expected to continue in the coming years.

T-Mobile's 5G SA network is expected to provide faster data speeds and lower latency compared to traditional 4G networks. This will enable new use cases such as enhanced mobile broadband and ultra-reliable low-latency communications.

Check this out: T Mobile 5g Advanced Definition