What Is New Radio?

New Radio (NR) is the air interface standard developed by the 3rd Generation Partnership Project (3GPP) for fifth-generation (5G) mobile networks. It defines the physical layer protocols, channel structure, waveform, and radio access procedures that govern wireless communication between user equipment and base stations in 5G systems. 3GPP introduced NR with Release 15 in 2018, establishing it as the global successor to the Long-Term Evolution (LTE) standard used in 4G networks.

New Radio is designed to support three distinct service categories defined by the International Telecommunication Union: enhanced mobile broadband (eMBB) for high-throughput data applications, ultra-reliable low-latency communication (URLLC) for applications requiring deterministic timing, and massive machine-type communication (mMTC) for dense deployments of low-power devices. This unified design philosophy distinguishes NR from LTE, which was optimized primarily for broadband data.

Physical Layer and Waveform

NR uses cyclic-prefix orthogonal frequency-division multiplexing (CP-OFDM) for both downlink and uplink transmissions, with discrete Fourier transform-spread OFDM (DFT-S-OFDM) available in the uplink for power-limited user equipment. A key design feature is scalable numerology: the subcarrier spacing can be configured from 15 kHz up to 240 kHz, allowing the same air interface to operate efficiently across frequency bands with very different propagation and bandwidth characteristics. This flexibility was a deliberate departure from LTE's fixed 15 kHz subcarrier spacing.

The 3GPP specification series 38 covers the NR physical layer, radio access network protocols, and core network interfaces in detail. Release 15 defined the foundational NR specification; subsequent releases have added capabilities including carrier aggregation, dual connectivity, and reduced-capability device profiles.

Spectrum and Frequency Ranges

NR operates in two defined frequency ranges. Frequency Range 1 (FR1) covers bands from 450 MHz to 7.125 GHz, encompassing the sub-6 GHz spectrum where propagation characteristics are broadly similar to LTE. Frequency Range 2 (FR2) covers millimeter wave bands from 24.25 GHz to 52.6 GHz, where available bandwidth is substantially larger but free-space path loss and sensitivity to blockage increase significantly.

Millimeter wave NR deployments use massive multiple-input multiple-output (Massive MIMO) antenna arrays to form narrow, steerable beams that compensate for propagation losses. As reported by IEEE Spectrum, millimeter wave NR can deliver five times the bandwidth available on LTE networks in the same spectrum allocation, enabling peak data rates measured in gigabits per second in dense urban environments.

Standalone and Non-Standalone Operation

3GPP defined two deployment modes for NR. In non-standalone (NSA) operation, NR radio access is combined with an existing LTE core network, allowing operators to deploy 5G radio while reusing 4G core infrastructure. In standalone (SA) operation, NR connects directly to the 5G Core (5GC) network, enabling the full latency and slicing capabilities specified in the standard. Early commercial 5G deployments widely used NSA mode; migration toward SA operation has continued through successive release cycles as 5GC deployments have expanded.

The IEEE Xplore paper "NR: The New 5G Radio Access Technology" provides a technical survey of the NR design principles, comparing the NR numerology framework and beamforming architecture to their LTE predecessors and explaining the engineering tradeoffs that drove the specification choices in Release 15.

Applications

New Radio has applications across a wide range of industries and use cases, including:

• Enhanced broadband services for consumers and enterprises in dense urban areas
• Industrial automation and factory control requiring sub-millisecond latency
• Connected vehicle communication and vehicle-to-infrastructure safety systems
• Fixed wireless access as a broadband alternative to wired connections
• Remote healthcare, telemedicine, and connected medical device networks
• Smart city infrastructure, public safety communications, and critical services