RF Wireless World

Browse articles, tutorials, tools, and vendors.

5G-Advanced 3GPP Release 18: Features & Benefits

By RF Wireless Expert Team

Introduction : The evolution of 5G is reaching a pivotal milestone. While the initial rollout of 5G was largely based on Non-Standalone (NSA) architectures which moved 5G radios onto legacy 4G core networks; the industry is now aggressively pivoting to true 5G Standalone (SA) architectures. This cloud native foundation sets the stage for the next major leap in wireless connectivity: 5G-Advanced, officially standardized in 3GPP Release 18.

With the specifications for Release 18 frozen, 5G-Advanced is poised to deliver on the original, transformative promises of 5G. It shifts the focus from sheer speed to network intelligence, efficiency, and hyper specialized use cases. Following is an exploration of the key technologies and applications driving 5G-Advanced, followed by a guide to 3GPP specifications for further study of the protocol stack.

Key Technologies and Applications of 5G-Advanced (Rel-18)

eRedCap (Enhanced Reduced Capability):

While the smartphone market demands gigabit speeds, the vast majority of Internet of Things (IoT) devices do not. 3GPP Release 17 introduced RedCap to support mid-tier IoT devices. Release 18 pushes this further with eRedCap.

  • eRedCap strips down the complexity of the 5G modem even further, minimizing bandwidth requirements and severely reducing power consumption. Target data rates are optimized around 10 Mbps.
  • This technology is the missing link for massive IoT deployments. It is designed for devices that need to run for years on a single battery charge, such as municipal parking meters, industrial wireless sensors and healthcare wearables. By drastically lowering the cost and power requirements of 5G modules, eRedCap will serve as the backbone for highly automated smart cities and advanced logistics tracking.

Non-Terrestrial Networks (NTNs):

To achieve truly ubiquitous global coverage, 5G-Advanced is looking to the sky. Release 18 significantly matures the integration of satellite communications into the standard cellular ecosystem.

  • NTN enhancements in Rel-18 improve mobility management, seamless handovers between terrestrial towers and Low Earth Orbit (LEO) satellites, and support for VSAT (Very Small Aperture Terminal) networks. It allows standard 5G devices to interact with satellite payloads directly.
  • NTNs are critical for remote and maritime coverage. Logistics companies can maintain continuous tracking of shipments crossing oceans or remote deserts without losing the signal. Furthermore, it promises to bridge the digital divide by bringing broadband connectivity to rural areas where laying fiber or building terrestrial towers is economically unviable.

High Speed Railways and FRMCS:

The transportation sector specifically railways is undergoing a massive communications overhaul, migrating away from GSM-R (Global System for Mobile Communications - Railway) standard.

  • 5G-Advanced is the foundation for the Future Railway Mobile Communication System (FRMCS). Release 18 enhances high speed mobility protocols, ensuring that devices traveling at speeds exceeding 500 km/h maintain stable, ultra-reliable, low latency connections without suffering from severe doppler shifts.
  • Beyond simple voice communications for train conductors, 5G-Advanced will enable trackside networks, real-time autonomous train control, high definition video surveillance for safety and seamless Wi-Fi connectivity for passengers.

Additional 5G-Advanced Enhancements:

  • Network Slicing: Empowered by a programmable SA core, operators can create highly customized virtual networks. For example, a port authority could use a dedicated slice to automate heavy cargo unloading via Automated Guided Vehicles (AGVs), cutting process times from hours to minutes.

  • ISAC (Integrated Sensing and Communication): Using radio waves not just to communicate, but to see. Airports are currently testing 5G-Advanced sensing capabilities to detect unauthorized drones near runways with remarkable accuracy.

  • AI and Machine Learning: Release 18 formally introduces AI/ML frameworks into the Air Interface and Radio Access Network (RAN) to optimize beamforming, mobility and energy savings.

  • L4S (Low Latency, Low Loss, Scalable Throughput): A vital network feature in 5G-Advanced that tightly couples the radio access network with the core to prioritize specific data packets. This is critical for Extended Reality (XR), industrial automation, and enterprise edge computing, where network jitter or lag can disrupt the user experience or industrial processes.

RF and Physical Layer (PHY) Enhancements

To support the massive capacity and varied use cases of 5G-Advanced, 3GPP Release 18 introduces several deep technical changes to how radio waves are manipulated and processed at the RF and PHY layers.

Sub-band Full Duplex (SBFD): In traditional Time Division Duplex (TDD) networks, a base station either transmits or receives on a specific frequency at any given time. 5G-Advanced introduces SBFD, allowing a base station to transmit (downlink) and receive (uplink) simultaneously on non-overlapping subbands within the same carrier. This drastically improves uplink capacity and reduces latency.

AI/ML on the Air Interface: Release 18 integrates Artificial Intelligence and Machine Learning directly into the PHY and MAC layers. Instead of relying on rigid, mathematical channel models, AI/ML is used for Channel State Information (CSI) compression and feedback, dynamic beam management and positioning accuracy. This reduces signaling overhead and improves RF link reliability.

Advanced MIMO Evolution: 5G-Advanced enhances Massive MIMO (Multiple-Input Multiple-Output) parameters. This includes better support for higher numbers of antenna ports, improved uplink MIMO for enhanced upload speeds (vital for live streamers and high definition mobile cameras) and greater mobility support for devices moving at high speeds across multiple cell sectors.

Integrated Sensing and Communication (ISAC): At the RF level, 5G-Advanced allows base stations to use cellular radio waves as a form of radar. By analyzing how RF signals bounce off physical objects, the network can detect movement, speed and size. Airports are already testing these RF sensing capabilities to detect unauthorized drones near runways, achieving a 99% detection rate.

High Precision Positioning: While 5G already offered location services, Rel-18 PHY enhancements push positioning accuracy down to the sub-decimeter (sub-10 cm) level. This is highly dependent on advanced RF timing algorithms (like carrier phase positioning) and is crucial for industrial robotics and Automated Guided Vehicles (AGVs).

Summary

In short, 5G-Advanced (based on 3GPP Release 18) shifts the industry focus from simple broadband speed to highly efficient, intelligent and specialized RF management. By integrating AI into the physical layer, enabling simultaneous transmit/receive subbands and creating highly tailored device categories like eRedCap, 5G-Advanced provides the actual technical framework required to fulfill the original, transformative promises of the 5G era.

3GPP References

  • TS 38.201, TS 38.211 to 38.214 : Physical Layer
  • TS 38.321 to TS 38.323, TS37.324 : Data link Layer
  • TS 38.331 : Network Layer, RRC - Radio Resource Control
  • TS 24.501 : Non-Access-Stratum (NAS) protocol for 5G System (5GS).

Continue Learning 5G NR

Continue Learning 5G NR Frame Essentials

Keep Reading

Related Posts