5G RedCap in IoT is one of the most important developments in wireless connectivity for devices. RedCap (Reduced Capability), also called NR-Light, is a simplified variant of 5G New Radio designed specifically for mid-throughput IoT devices — those for which NB-IoT and LTE-M are too slow, while full 5G is too expensive and power-hungry. In this guide we explain what 5G RedCap in IoT is, what parameters it has, and when it is worth deploying.
In short: 5G RedCap (NR-Light) is a lightweight 5G variant with throughput on the order of 85–220 Mbps that combines the low cost and power draw of LPWAN devices with performance close to LTE, filling the mid-throughput gap in IoT.
What is 5G RedCap in IoT?
5G RedCap is a pared-down version of the 5G NR standard introduced in the 3GPP Release 17 specification, designed for IoT devices with moderate requirements. Reducing "capability" means a deliberate simplification of the modem: a narrower channel width, fewer receive chains, and simplified modulation.
In practice, this means a cheaper, smaller, and more energy-efficient radio circuit than in a 5G smartphone, which nonetheless still uses the 5G Standalone network core. As a result, 5G RedCap in IoT inherits the advantages of 5G — low latency, network slicing, and network longevity — without their full cost.
How does RedCap compare with NB-IoT, LTE-M, and full 5G?
RedCap sits in the middle of the IoT connectivity spectrum: faster than LPWAN protocols, lighter than full 5G eMBB. Limiting the channel width to 20 MHz (FR1) and dropping to one or two receive antennas lowers the modem cost by as much as 60–70% relative to a standard 5G circuit.
- NB-IoT — up to about 250 kbps, ideal for sensors and smart metering; more in our comparison of LoRaWAN, NB-IoT, and LTE-M for asset tracking.
- LTE-M (Cat-M1) — up to about 1 Mbps, with mobility and voice support and low latency.
- 5G RedCap — 85–220 Mbps downlink, 10–100 Mbps uplink, latency below 100 ms.
- 5G eMBB — gigabits per second, but a high modem cost and power draw.
What are the technical parameters of 5G RedCap?
5G RedCap is a trade-off of parameters: throughput on the order of hundreds of Mbps with power draw close to LTE-M thanks to power-saving mechanisms. Key figures worth knowing when designing a device:
- Maximum channel width: 20 MHz in the FR1 band (sub-6 GHz), 100 MHz in FR2 (mmWave).
- Throughput: typically 85–150 Mbps downlink (up to ~220 Mbps in favorable conditions).
- Number of receive antennas: 1–2 instead of 4, which simplifies the design of the PCB for IoT devices.
- Power savings: eDRX and RRM Relaxation extend battery life — a topic we develop in the article on energy efficiency in IoT.
- Latency: usually below 100 ms, sufficient for remote control and video.
When to use 5G RedCap? Example applications
5G RedCap works best where mid-range throughput and mobility are needed and LPWAN is too slow. It is the connectivity layer for "mid-range" devices in the IoT ecosystem.
Typical scenarios include: industrial cameras and vision sensors, AR/VR terminals for service technicians, advanced medical wearables, industrial-grade FWA routers, and mobile gateways for IoT device fleet management. In industry, RedCap also powers telemetry sensors in industrial IoT solutions, where near-real-time data streaming matters. Keep in mind that RedCap will not replace NB-IoT in simple sensors battery-powered for years — it is a technology for devices that genuinely need higher throughput.
How to deploy 5G RedCap: firmware, modules, and cloud
Deploying 5G RedCap requires coherent work across three layers: hardware (the module and antenna), firmware (the communication stack and power management), and cloud (receiving and processing telemetry). FSS designs all three layers in a single engineering process.
At the hardware level, we select RedCap modules and design custom IoT devices for specific operator bands. The firmware must support remote updates — we deliver them through OTA updates at fleet scale, so hundreds of devices receive patches without a technician's visit. Telemetry data reaches an Azure-based cloud backend, where it is buffered, analyzed, and exposed via an API. This architecture lets you scale a deployment from a single prototype to a fleet numbering in the thousands without rebuilding the technology stack.
Security and fleet management of RedCap devices
5G RedCap security is based on SIM/eSIM-level authentication and transport-layer encryption — but this does not relieve the manufacturer of protecting the device itself. Every device should have a unique cryptographic identity and encrypted communication with the cloud.
In practice, we combine device authentication with X.509 certificates in a zero-trust model with the good practices described in our guide to IoT security. As a result, a fleet of RedCap devices remains resistant to data interception and device spoofing, even when operating on a public cellular network.
Frequently asked questions (FAQ)
How does 5G RedCap differ from NB-IoT and LTE-M?
5G RedCap offers much higher throughput (up to 85–220 Mbps) than LTE-M (up to 1 Mbps) and NB-IoT (up to 250 kbps), while keeping cost and power draw low. It fills the mid-throughput niche that these protocols did not serve, such as industrial cameras or advanced wearables.
Does 5G RedCap work on existing 5G networks?
Yes. RedCap was defined in 3GPP Release 17 and works on 5G Standalone (SA) networks. The operator enables it with a base-station software update, without new radio infrastructure, which speeds up the technology's availability for IoT deployments.
When will 5G RedCap be widely available?
The first commercial networks and RedCap modules appeared in 2024–2025. Mass availability of modems and pricing close to LTE-M is expected in the coming years, as operators expand the 5G SA core and phase out older LTE technologies.
Summary and key takeaways
5G RedCap (NR-Light) is the missing link in IoT connectivity: it fills the gap between energy-efficient LPWAN and high-performance but costly 5G eMBB. With throughput on the order of 85–220 Mbps, low latency, and power savings, it opens new applications — from industrial cameras to mobile wearables — without the compromises that older technologies forced.
As a team with years of experience in hardware, firmware, and cloud design, at FSS we help you go from concept to a finished, certified 5G RedCap device. Want to check whether RedCap fits your product? Explore our capabilities in IoT hardware and system integration and let's talk about a deployment.