Less Complexity, More Efficiency What 5G RedCap Contributes to Scalable Industrial Networking

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FAULHABER Drive Systems

While AI, automation, and IoT accelerate industrial transformation, wireless connectivity has often encountered economic or technical limitations. 5G RedCap now bridges the gap between high-end broadband and low-power IoT. This makes networking millions of industrial devices scalable for the first time.

AI and automation are transforming industries and driving innovation and productivity across sectors. According to PwC forecasts, the manufacturing industry will contribute approximately 34 trillion USD to the global GDP by 2035 through these technology-driven changes. However, to fully realize this potential, connectivity must evolve in sync with industrial processes.

While the full 5G standard (eMBB) has revolutionized wireless communication, its performance spectrum far exceeds the requirements of many industrial devices. On the other hand, established 4G/LTE solutions are increasingly reaching their limits in terms of scalability, latency, and future-proofing.

Here, 5G Reduced Capability (RedCap), introduced with 3GPP Release 17, fills a critical market gap. As a streamlined and energy-efficient 5G variant, RedCap is designed for use cases that do not require multi-gigabit rates but wish to benefit from the advantages of the 5G core network. RedCap deliberately focuses on a reduced feature set, providing a robust and cost-effective foundation for widespread industrial digitalization. With the increasing proliferation of connected IoT devices in enterprises, 5G RedCap will evolve into a key connectivity technology, supporting diverse industrial use cases—from intelligent logistics and urban infrastructures to more resilient energy networks.

Efficiency Instead of Overcapacity

5G RedCap fills a critical gap in the industrial connectivity mix. With typical data rates between 90 and 200 Mbps, the peak values are significantly lower than those of high-end 5G (eMBB) but are more than sufficient for the majority of industrial applications. The key advantage lies in improving hardware complexity: RedCap enables simpler module designs, requires fewer antennas, and significantly reduces energy consumption. These are all factors that help lower the total cost of ownership (TCO).

Applications such as asset tracking, remote monitoring, or autonomous transport systems (FTS) do not require gigabit bandwidths. For them, stable, reliable connections in high node density and long battery life are critical. RedCap provides the necessary robustness and ensures future-proof operation through integration into modern 5G networks over the lifecycle of industrial systems.

The use of RedCap is particularly advantageous for devices such as industrial cameras, smart meters, or autonomous sensor nodes. A technical highlight is the uplink performance: while older standards like LTE Cat.4 often reach their limits, RedCap offers significantly more stable throughput rates for data transfer from the device to the network. This high uplink performance is a key requirement, especially for AI-based video analysis and real-time monitoring scenarios.

Optimized Hardware

The technological strength of 5G RedCap begins at the hardware level. Unlike high-end 5G modems, RedCap devices use simplified antenna configurations (typically 1T1R or 1T2R) and a reduced RF frontend. By omitting complex features such as carrier aggregation or massive MIMO support, not only are the bill of materials (BOM) costs reduced, but the complexity of PCB design is also lowered. This makes it easier for manufacturers to integrate the technology into compact industrial form factors.

A crucial factor for IIoT applications is energy efficiency. Here, RedCap plays two key advantages from the 3GPP standard:

1. Extended Discontinuous Reception (eDRX): This feature extends the intervals during which the device remains in deep sleep while still staying accessible to the network.
2. Optimized Radio Resource Management (RRM relaxation): Fewer measurements of neighboring radio cells when the device is in a stable radio environment or stationary.

These mechanisms drastically reduce power consumption. In practice, this allows maintenance-free operation of battery-powered sensors for several years. This is an example of installations in hard-to-reach locations.

RedCap is natively designed for scaling within modern 5G-SA networks. The architecture improves spectral efficiency and alleviates network infrastructure, as the devices no longer require dual connectivity (EN-DC) with LTE. Thus, RedCap is not only a replacement for aging LTE standards but an integral part of a future-proof 5G infrastructure that is specifically tailored to the requirements of industrial digitalization.

Where RedCap Really Makes Sense

5G RedCap can fully realize its potential wherever end devices need to be cost-efficient and energy-saving without compromising the performance of the 5G ecosystem. In the Industrial IoT (IIoT), this primarily applies to gateways and industrial sensors. There is a high demand here for affordable 5G modules that can be scaled in large quantities. Mobile devices such as rugged industrial tablets or wearables—for example, AR glasses for remote maintenance or health trackers for occupational safety—also benefit from reduced complexity. RedCap bridges the gap between massive IoT (NB-IoT/LTE-M) and broadband 5G (eMBB) by delivering moderate data rates with high reliability and optimized latencies.

Beyond the factory floor, RedCap offers advantages for the energy and utility sectors. Within the framework of smart grids, RedCap enables precise real-time telemetry and fault detection. Since many sensors and control units in intelligent power grids are installed in hard-to-reach locations, the combination of stable cellular connections and extremely long battery life is a critical success factor. The same applies to urban infrastructure: from connected traffic light control and live traffic monitoring to smart parking systems, RedCap provides sufficient bandwidth for moderate video transmissions without exceeding cost structures.

A third major field is the transport and logistics sector. With RedCap, seamless real-time asset tracking and the control of autonomous transport vehicles (FTS) are possible. The improved uplink proves particularly valuable in container terminals or large warehouse environments, as it ensures reliable video feedback for the remote control of cranes or other heavy machinery.

Technical Specifications and Requirements

Technically, 5G RedCap was specified in the 3GPP Releases 17 and 18. It is precisely positioned between the performance-oriented 5G New Radio (eMBB), designed for maximum bandwidth and minimal latency, and classic low-power technologies like NB-IoT or LTE-M (mMTC). While the latter are optimized for small data volumes, RedCap provides the necessary performance for more demanding tasks without adopting the complexity of high-end modules.

For hardware design, this means specifically: RedCap devices support a bandwidth of up to 20 MHz (Sub 6 GHz) and operate with only one or two receive paths (1T1R or 1T2R). Through optimized protocol stacks and simpler signaling, the computational load on the baseband processor is significantly reduced. The result is a data rate that is roughly 30 to 60 percent lower than that of eMBB modules but, in return, drastically extends battery life thanks to advanced power-saving features. While Release 17 established the technological foundation, the current Release 18 (eRedCap) primarily focuses on further optimizing cost structures and energy efficiency.

Developers should consistently leverage the new opportunities to save energy during implementation. These include extended sleep phases (eDRX) and precisely configurable inactivity timers. In the current market introduction phase, it should be noted that frequency band support is often still focused on core areas such as n78 (3.5 GHz) for campus networks or n28 (700 MHz) for wide-area coverage.

Although the chipset ecosystem is still being developed, the economic forecast is clear: Since RedCap chipsets are expected to be approximately 60 percent cheaper than today's eMBB components, the technology will become a crucial economic lever for the large-scale networking of industrial assets.

Implementation and Market Readiness

A key advantage for the rapid scaling of 5G RedCap is the method of implementation: for network operators and private campus network providers, RedCap is primarily a software matter. Activation is carried out via updates and targeted parameter adjustments in the Radio Access Network (RAN) and the 5G core network (Core). Hardware modifications to the base infrastructure are generally not required. In Nokia's RAN portfolio, for example, RedCap has been supported since Release 23R3 (third software release of 2023), specifically for both FDD (Frequency Division Duplex) and TDD (Time Division Duplex).

On the core network side, the adjustments primarily address the Access and Mobility Management Function (AMF). In the 5G standard, this function is responsible for device type identification, signaling, and mobility management. By correctly recognizing a RedCap device, the network can efficiently allocate resources and optimally control the specific energy-saving features.

The ecosystem follows a proven path: as with the introduction of 5G Standalone, the market rollout of chipsets and modules is taking place in stages. With the increasing availability of these components, device developers now have the pivotal tool to bridge the gap between high-performance 5G and massive IoT. 5G RedCap is thus ready to act as an economic catalyst for the next phase of industrial digitalization.

Foundation for a Scalable Future

5G RedCap is far more than a light version of 5G. Rather, it is a targeted technological evolution that makes the advantages of the 5G infrastructure, such as modern latency management and high security, economically accessible for the broad middle field of industrial applications. The technology is precisely aimed at use cases that do not require multi-gigabit rates but benefit greatly from reduced complexity, lower device costs, and an optimized energy balance.

With the progressive expansion of 5G Standalone networks and the growing availability of certified modules, RedCap offers companies a pragmatic and future-proof option to build intelligent infrastructures. In doing so, RedCap acts as a crucial catalyst for industrial digitalization: it provides the scalability and cost efficiency needed to broadly realize the vision of Industry 4.0 and Smart Cities. 

*Azfar Aslam is CTO for Nokia's European operations.