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5G NR LTE Air Interface

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The 5G NR (New Radio) Air Interface

The 5G New Radio (5G NR) is a new air interface being developed for 5G. 5G NR is being developed from the ground up in order to support the great variety of services, devices & deployments which 5G will encompass, including diverse spectrum requirements, building on established LTE technologies to ensure backwards and forwards compatibility.

5G NR Air Interface for LTE
5G NR Air Interface for LTE

Introducing 5G NR: A new Air Interface for LTE

5G NR is a new air interface being developed for 5G. An air interface is the radio frequency portion of the circuit between the mobile device and the active base station. The active base station can change as the user is on the move, with each changeover known as a handoff.

5G will initially be made available through improvements in LTE, LTE-Advanced and LTE Pro technologies. But it will be soon be followed by a major step-up with the introduction of a new air interface.

The 3GPP (3rd Generation Partnership Project) made decisions on some of the technologies to be used in 5G NR as part of the 5G NR Release 14 Study Item which officially began in March 2016. The first 3GPP 5G NR specification would be part of Release 15, on which work began in June 2016 and is set to complete in September 2018. With Release 14 frozen (completed) in June 2017, from the second half of 2017 3GPP’s work has been focused on Release 15 to deliver the first set of 5G standards.

In March 2017 the 3GPP’s RAN Group committed to accelerate the 5G NR workplan with an agreement for the early completion of an intermediate milestone for the enhanced Mobile Broadband (eMBB) use case (See below). This non-standalone (NSA) 5G NR variant was to be finalised by March 2018 but in fact was approved in December 2017, the first 5G standard. It uses the existing LTE radio and core network.

The first call using the NSA 5G NR standard was completed in February 2018 on a test network in Spain, by Vodafone and Huawei.

The standalone (SA) mode was to be completed by September 2018 but was also finished early, in June 2018. It implies full user and control plane capability using the 3GPP’s new 5G core network architecture.

The March 2017 agreement also defined a framework to ensure commonality between the two variants. It put compatibility at the heart of 5G NR design so that new capabilities and features can be introduced in subsequent releases of the standard.

The accelerated schedule will enable large-scale trials and deployments compliant with 3GPP standards from 2019, earlier than the originally envisaged timeline of around 2020.

3GPP LTE 4G 5G NR ongoing releases
3GPP LTE 4G 5G ongoing releases

What will 5G NR do?

In a nutshell, the 5G NR is being designed to significantly improve the performance, flexibility, scalability and efficiency of current mobile networks, and to get the most out of the available spectrum, be that licensed, shared or unlicensed, across a wide variety of spectrum bands.

Furthermore, the 5G NR air interface is just one component of the future 5G network so it must also be designed to work as part of a wider flexible network architecture.

The 5G NR must be able to: deliver a huge number of varied services provided across a diverse set of devices with different performance and latency requirements; support a wide range of deployment models from traditional macro to hotspot deployments; and allow new ways for devices to interconnect, such as device-to-device and multi-hop mesh. And it must do all this at unprecedented levels of cost, power and deployment efficiencies.

How will 5G NR work?

The core 5G NR design will encompass three foundational elements:

Optimised OFDM-based waveforms and multiple access. An early decision was taken to use the OFDM (orthogonal frequency-division multiplexing) family of waveforms for 5G, although the exact waveform and multiple access implementation has not yet been decided and multiple OFDM variants are being considered for different use cases and deployments.

OFDM waveforms are used by both LTE and WiFi, which will make 5G the first mobile generation that will not be based on a completely new waveform and multiple access design. They will be optimised with more advanced capabilities to deliver high performance at low complexity; support diverse spectrum bands, spectrum types and deployment models; and efficiently support and multiplex all the different use cases.

common flexible framework to enable efficient multiplexing of diverse 5G services and provide forward compatibility for future services. It will enable lower latency as well as scalability at far lower latencies than is possible with current LTE networks.

Advanced wireless technologies to deliver the new levels of performance and efficiency that will enable the wide range of 5G services. There are three general designations of 5G services and we’ve outlined these here, along with some of the advanced wireless technologies that will be needed to make them reality:

  • Enhanced Mobile Broadband (eMBB): Data-intensive applications that need lots of bandwidth, like video streaming or immersive gaming, to give the same experience on a mobile device that we’d get from fixed fibre-optic. The technologies that will make it happen include Gigabit LTE, massive MIMO, mmWave technologies, spectrum sharing techniques and advanced channel coding.
  • Ultra-reliable and Low-latency Communications (uRLLC) or Mission-Critical Control: Latency-sensitive services needing extremely high reliability, availability and security, such as autonomous driving and Tactile Internet applications . Technologies are being developed that are specific to particular use cases, like cellular vehicle-to-everything (C-V2X) and real-time command and control for cellular drone communications, as well as those to support the ‘no-failure’ requirement, such as multiplexing to prioritise mission-critical transmissions over regular traffic or redundant links so that mission-critical devices can connect across multiple networks.
  • Massive Machine Type Communications (mMTC) or Massive IoT: Low cost, low energy devices with small data volumes on a mass scale, such as smart cities. Narrowband IoT will be enhanced with capabilities like voice support, lower latency, location services, device mobility and broadcast for efficient over-the-air (OTA) firmware updates. Qualcomm is proposing the RSMA (Resource Spread Multiple Access) uplink multiple access design for more efficient uplink transmission, as well as a new WAN-managed multi-hop mesh architecture to extend network coverage.

Who is involved in 5G NR ?

As with LTE, much of the early work on 5G NR was led by Qualcomm and, as with the rest of 5G, every mobile carrier and equipment maker of note is in the game: over 40 companies signed the March 2017 agreement to accelerate 5G NR development.

Qualcomm has developed optimised OFDM-based wavelengths that will scale in both the frequency and time domains, as well as optimised multiple access for different use cases and a new 5G NR framework to efficiently multiplex 5G services and features. By early 2017, Qualcomm, in partnership with Ericsson and ZTE, had announced 5G NR trials with AT&T, China Mobile, NTT DOCOMO, SK Telecom, Telstra and Vodafone. It had also expanded its Qualcomm Snapdragon X50 5G modem family to include new multi-mode modems to support the global 5G NR standard (both sub-6GHz and multi-band mmWave) and Gigabit LTE on a single chip. In October 2017, Qualcomm announced the first data connection on a single-chip 5G modem (the Snapdragon X50) and previewed its first mmWave 5G smartphone reference design. It launched the first commercial 5G NR mmWave antenna modules and sub-6GHz RF modules for smartphones and other devices in July 2018, all compatible with the Snapdragon X50. Commercial 5G smartphones took a step closer to reality.

Qualcomm and Nokia announced they would collaborate on 5G NR in September 2017, and in February 2018 completed interoperability testing to the NSA 5G NR NSA specifications. The tests used Nokia’s AirScale base station (which has been commercially available since 2017 and has over 100 customers) and device prototypes from Qualcomm. The move paved the way for 5G NR field trials with a number of operators in 2018, including BT/EE in the UK plus Deutsche Telekom and Vodafone Group which have UK mobile operations.

Qualcomm is also working with other partners on 5G NR. In November 2017, it completed the first end-to-end 5G NR Interoperability Data Testing (IoDT) system with ZTE and China Mobile, demonstrating a data connection based on the standard being finalised by 3GPP. In February 2018 it completed interoperability testing with pre-commercial 5G NR base stations from Samsung in partnership with KT Corporation in South Korea.

Ericsson claims to have unveiled the world’s first commercially available 5G NR in August 2016. The Ericsson AIR 6468 supports the vendor’s 5G Plug-Ins for massive MIMO and multi-user MIMO. New mid-band (AIR 6488) and high-band (AIR 5121) versions had been launched by early 2018. The Ericsson AIR 3246 radio was announced in September 2017 and is set to become commercially available in 2018, the first 5G NR for frequency division duplex (FDD). It supports both 4G/LTE and 5G NR technologies. In December 2017, Ericsson, Vodafone and King’s College London tested standalone pre-standard 5G using a prototype device, a UK first showing 5G working independently of 4G.

BT-owned EE conducted the first test of an end-to-end 5G network architecture in the UK in November 2017, broadcasting 5G NR over 100MHz of 3.5GHz test spectrum. In February 2018, BT and EE extended their strategic partnership with Huawei to include live 5G NR trials.

Huawei launched its first commercial 5G terminal in February 2018, incorporating the Balong 5G01 chipset developed in-house. The terminal comes in a sub-6GHz model and an mmWave model, with both indoor and outdoor units. In July 2018 the vendor completed 5G NR interoperability and development testing with Intel and China Mobile, successfully interconnecting NR-compliant terminals and network from different vendors. Huawei and Intel had agreed to partner on 3GPP-based interoperability trials in September 2017. Intel has been working on a number of 5G NR trials in preparation for the availability of its XMM 8000 series of 5G multi-mode chipsets in commercial devices in 2019.

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