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What Is 5G RedCap? A Practical Guide for UK IoT Deployments
5G RedCap is a stripped-down version of 5G aimed at IoT and industrial devices that need more bandwidth than LTE-M or NB-IoT can offer, but do not need the full hardware (or full power draw) of standard 5G NR. For UK deployments in CCTV, sensors, gateways, telematics, and connected infrastructure, it is the most relevant 5G profile to understand right now.
RedCap, defined in 3GPP Release 17, occupies the connectivity middle ground between LTE-M and full 5G NR. It runs only on 5G Standalone networks. UK SA coverage is now meaningful (VMO2 leads on footprint, EE leads on quality), and RedCap pilots are moving into commercial availability through 2026. The practical recommendation: specify RedCap-capable hardware now, but pair it with multi-network IoT SIMs that fall back to LTE Cat 4 so devices stay connected wherever you deploy them.
The Problem RedCap Solves
Until recently, IoT specifiers had a binary choice. At one end, NB-IoT and LTE-M deliver good battery life and wide coverage, but throughput tops out at around 1 Mbps. That is fine for a water meter, but nowhere near enough for a video feed. At the other end, full 5G NR delivers multi-gigabit speeds on hardware that is expensive, power-hungry, and over-specified for almost any industrial use case.
RedCap fills the gap. Defined in 3GPP Release 17 (finalised in 2022), it deliberately strips back the radio capabilities of a 5G device (fewer antennas, narrower bandwidth, simpler modulation) to produce hardware that is smaller, cheaper, and lower-power, while still operating natively on 5G infrastructure. The formal name in the spec is NR-Light.
Key Specifications at a Glance
You will see "up to 150 Mbps downlink" quoted widely. The reality varies. Per Ericsson's white paper, the simplest RedCap device achieves around 85 Mbps downlink in low FDD bands and around 50 Mbps in mid TDD bands. The 150 Mbps figure assumes two receive antennas and dual MIMO layers in favourable conditions. The GSMA quotes a theoretical peak of around 226 Mbps. Real-world throughput depends on band, antenna configuration, network conditions, and the specific device.
How RedCap Compares to Other Technologies
The table below shows where RedCap sits relative to the other IoT connectivity options. The middle ground it occupies was previously served, imperfectly, by LTE Cat 1 and Cat 4 devices.
| Feature | NB-IoT | LTE-M | 5G RedCap | Full 5G NR |
|---|---|---|---|---|
| 3GPP Release | Rel-13 | Rel-13 | Rel-17 | Rel-15+ |
| Peak DL speed | ~250 kbps | ~1 Mbps | 85 to 150 Mbps* | Multi-Gbps |
| Latency | 1 to 10 sec | 10 to 100 ms | <100 ms | <10 ms |
| Max bandwidth | 200 kHz | 1.4 MHz | 20 MHz (FR1) | 100 MHz (FR1) |
| Battery life | 10+ years | 10+ years | Months to years | Hours to days |
| Network slicing | No | No | Yes | Yes |
| Network required | 4G/5G | 4G/5G | 5G SA only | 5G SA or NSA |
| Typical use cases | Meters, sensors | Asset tracking, telemetry | CCTV, wearables, gateways | Smartphones, broadband |
*Actual throughput depends on antenna configuration, band type, and network conditions. See the note above.
What Gets Reduced, and Why It Matters
The "reduced capability" in RedCap refers to specific, deliberate simplifications to the 5G NR radio design. Per 3GPP and Ericsson, these can cut the modem bill-of-materials by around 65% for sub-6 GHz (FR1) devices compared to a standard 5G NR modem. The simplifications fall into four areas.
Narrower Bandwidth
RedCap operates within 20 MHz of bandwidth in FR1 (sub-6 GHz), against 100 MHz for standard 5G NR. This is the single largest contributor to cost and complexity reduction.
Fewer Antennas
Standard 5G NR uses 4×4 MIMO. RedCap can run on a single receive antenna (1T1R), although two-antenna (1T2R) configurations are also supported and deliver better throughput. The antenna configuration directly affects achievable speeds, so this is a real design decision rather than a marketing detail.
Relaxed Modulation
Only 64QAM is mandatory for RedCap. 256QAM is optional. That simplifies signal processing, which in turn simplifies the silicon.
Half-Duplex FDD Option
RedCap supports an optional half-duplex mode, meaning the device does not transmit and receive simultaneously. This lets cheaper switches replace the more expensive duplexers used in full 5G hardware.
The 5G Standalone Requirement
RedCap only works on 5G Standalone (SA) networks. A lot of UK 5G coverage is still delivered using Non-Standalone (NSA) architecture, where 5G radio frequencies sit on top of a 4G LTE core. RedCap requires a full 5G core. No SA coverage means no RedCap, regardless of whether your device sees a 5G signal.
The constraint is real, but UK SA coverage has moved on substantially over the last two years. All four major operators are investing in SA infrastructure, and most current RedCap hardware ships with LTE Cat 4 fallback so devices stay connected where SA has not yet reached.
UK Network Readiness (Mid-2026)
The UK SA picture is now meaningfully different from where it sat 12 months ago. The table below summarises where the major operators are. The merged VodafoneThree network is treated separately where its SA position differs from the legacy single-operator estates.
| Operator | 5G SA position | RedCap status |
|---|---|---|
| VMO2 (O2) | Largest UK SA footprint by population coverage; live in 500+ towns and cities, around 86% population | Pilot to commercial |
| EE (BT) | 5G+ (SA) reaching ~44 million people; consistently top operator on independent UK network tests | Pilot to commercial |
| VodafoneThree | SA rollout accelerated through 2025 and into 2026 following the merger | On roadmap |
What that means in practice: SA coverage now reaches the majority of the UK population in outdoor terms, but indoor and rural gaps remain. Commercial RedCap services are live or imminent on the major networks rather than years away, which is a different position from where this conversation sat in 2024.
For UK IoT deployments today, multi-network roaming SIMs with LTE fallback are the right foundation. Your devices stay connected through SA coverage gaps, and RedCap-capable hardware will pick up SA automatically as it rolls out. Private 5G networks are different: these almost always run SA from day one, so RedCap is fully usable now.
Three Target Use Cases
The 3GPP standard defines three reference use cases for RedCap, and they map closely to the deployments we see at Millbeck.
Video Surveillance and CCTV
IP cameras and surveillance systems typically need consistent upload bandwidth in the 2 to 10 Mbps range. That is well beyond NB-IoT or LTE-M, and well below full 5G. RedCap is right-sized for streaming video without paying for hardware you do not need. It is particularly relevant for remote or temporary CCTV where fixed-line connectivity is not available.
Industrial Wireless Sensors
Pressure sensors, motion detectors, environmental monitors, and industrial controllers that need to send frequent moderate-sized payloads with low latency. RedCap improves responsiveness over LTE while keeping power consumption manageable.
Wearables and Health Monitors
Smartwatches, medical monitoring devices, and fitness trackers needing always-on cellular in a small form factor with long battery life. The reduced antenna count and lower modem complexity make compact, multi-day-battery wearables on 5G feasible at sensible cost.
What About eRedCap?
3GPP Release 18 (finalised in 2024) introduced enhanced RedCap, or eRedCap. This pushes the simplification further, capping peak throughput at 10 Mbps in both directions and targeting direct replacement of LTE Cat 1 and Cat 1bis devices. Those are the workhorse categories behind millions of European IoT deployments: point-of-sale terminals, basic telemetry, fleet tracking, utility metering.
eRedCap module availability is starting to appear during 2026, with volume arrival expected in 2027 and broader device availability from 2028. If your deployment currently runs on LTE Cat 1 and you are planning a migration path to 5G, eRedCap is the technology to watch rather than standard RedCap.
RedCap Hardware Available Today
The hardware ecosystem has matured quickly. The dominant chipset in Western markets is the Qualcomm Snapdragon X35, used by module manufacturers including Quectel, Fibocom, and Telit Cinterion. MediaTek's T300/M60 is the main alternative. Both are now integrated into a growing range of industrial routers and embedded devices.
Teltonika, Available From Millbeck
As a Teltonika Diamond Partner, we supply the full Teltonika RedCap range. Every model runs 5G sub-6 GHz SA with LTE Cat 4 fallback, dual SIM with auto-failover, and is managed through Teltonika RMS for remote fleet management. We can supply these pre-configured with IoT SIMs and antennas as a complete deployment-ready package.
| Device | Form factor | Key features | Best for |
|---|---|---|---|
| Teltonika RUT271 | Compact industrial router | 2× Ethernet, Wi-Fi 4, up to 50 clients, −40 to +75°C, DIN rail mount | CCTV, remote monitoring, basic IoT gateway |
| Teltonika RUT276 | Compact industrial router with serial | 2× Ethernet, RS232 + RS485, Wi-Fi 4, PoE-in, Modbus / BACnet / OPC UA support | SCADA, BMS, industrial protocol conversion |
| Teltonika RUT976 | Feature-rich industrial router | 4× Ethernet, RS232 + RS485, USB, GNSS, Wi-Fi, up to 100 clients, multiple I/Os | Fleet telematics, complex IIoT, multi-device sites |
| Teltonika CALYX (EBD070) | Raspberry Pi HAT+ | Embedded 5G RedCap modem, mounts directly onto Pi 4/5, GPIO control, −40 to +75°C | Edge gateways, ANPR, digital signage, embedded OEM projects |
Other Manufacturers Worth Knowing
The RedCap router market is broader than Teltonika alone. Two other vendors are worth flagging.
Digi IX25
Launched in March 2026, this is a rugged industrial router from Digi International available in LTE, 5G RedCap, and 5G eMBB variants on a unified hardware platform. It is built for demanding environments (rated −40 to +75°C with C1D2, ATEX, and MIL-STD-810H certifications), with four Gigabit Ethernet ports, active eSIM with zero-touch provisioning, edge compute, and GNSS. Managed through Digi Remote Manager and TAA-compliant, which makes it relevant for government and critical infrastructure work.
Advantech ICR-2452 (ICR-2000 Series)
Advantech's entry into the RedCap space. EU-designed industrial router with 5G RedCap SA and LTE fallback, dual SIM, dual Ethernet, RS232/RS485 serial, and optional Wi-Fi and GNSS. Runs an open Linux-based OS that supports custom Python and C/C++ applications, and integrates with Advantech's WebAccess/DMP cloud platform. A good fit for industrial protocol conversion and edge computing.
All of these devices share the same underlying approach: 5G RedCap for forward-looking connectivity, with LTE Cat 4 fallback for today's coverage reality. The right choice usually comes down to interfaces (do you need serial ports, how many Ethernet ports), environment (indoor cabinet vs outdoor pole mount), and management platform. We are happy to help spec the right device for the project at hand.
Features RedCap Inherits From 5G
Because RedCap runs on the 5G SA core, devices get access to advanced 5G features that LTE simply cannot offer. These include network slicing (dedicating a portion of network capacity to specific devices or applications), 5G LAN for simplified Ethernet-like connectivity between enterprise devices, improved positioning accuracy, and the stronger 5G authentication framework. For long-life IoT estates, that future-proofs the deployment in a way LTE Cat 4 cannot match.
Some sources lump RedCap in with URLLC (Ultra-Reliable Low-Latency Communication). RedCap devices do benefit from 5G's improved latency over LTE, but they are not designed to deliver the same ultra-reliable, ultra-low-latency guarantees as full URLLC-class devices. RedCap sits below URLLC in the capability hierarchy. It bridges the gap between LPWA and high-end 5G rather than matching the high end.
Should You Deploy RedCap Now?
For most UK IoT projects: specify RedCap-capable hardware, but plan around LTE Cat 4 fallback for the next 12 to 24 months.
Release 17 RedCap hardware is commercially available and technically mature. Dual-mode devices that support both RedCap and LTE Cat 4 give you a clean migration path. The deployment works today on LTE and transitions onto 5G RedCap as SA coverage rolls out across your sites. On private 5G networks (which generally run SA from day one) RedCap is ready to use immediately.
The exception is deployments with very tight power budgets that could live within a 10 Mbps throughput cap. For those, it may be worth waiting for eRedCap modules to mature through 2026 and 2027.
Frequently Asked Questions
Does RedCap require a special SIM card?
It requires a SIM that supports 5G Standalone networks. Most modern IoT SIMs from major providers do, but it is worth confirming with your SIM provider, particularly for older inventory. Multi-network IoT SIMs with LTE fallback are the practical choice for UK deployments today.
Can I use my existing LTE Cat 4 routers and just upgrade later?
You can, but RedCap requires new hardware. The radio design is fundamentally different. If your devices will be in the field for five to ten years, specifying RedCap-capable hardware now is the more sensible long-term position.
Is RedCap faster than LTE Cat 4?
In favourable conditions, yes. LTE Cat 4 peaks at around 150 Mbps downlink in theory, similar to RedCap. In practice, RedCap on a 5G SA network typically delivers more consistent latency and better network features (slicing, 5G LAN). The headline speed is not the main reason to choose it.
What about 5G coverage indoors?
Indoor 5G SA coverage in the UK still varies significantly by building and location. For mission-critical indoor IoT, plan around LTE fallback or consider a dedicated indoor cellular solution. External antennas can help significantly with router-based deployments.
Is RedCap available on private 5G networks?
Yes, and arguably this is where RedCap is most usable today. Private 5G networks generally run on SA architecture from day one, which means RedCap is fully supported without depending on public network rollout timelines.
Need Help Choosing the Right Connectivity?
Whether you need RedCap-capable routers, multi-network IoT SIMs with LTE fallback, or advice on planning a migration from 4G to 5G, we are happy to help.
Talk to the Millbeck TeamSources
3GPP Release 17 Specifications (3gpp.org) · Ericsson, "RedCap: Expanding the 5G Device Ecosystem" white paper · Ericsson, "RedCap/eRedCap: Standardizing Simplified 5G IoT Devices" (December 2024) · GSMA, "RedCap/eRedCap for IoT" whitepaper (2025) · GSMA, "Mobile IoT in a 5G Future" (October 2024) · Keysight, "RedCap: Cellular IoT for the 5G Era" · TÜV SÜD, "5G RedCap Devices & Technology for Industrial IoT" · Virgin Media O2 press release on 5G SA reaching 500 towns and cities (September 2025) · Ericsson press release, VMO2 RAN partnership extension (March 2026) · umlaut/connect Mobile Network Test UK 2026 · Opensignal UK Mobile Network Experience Report (January 2026) · Ofcom Mobile Matters 2025
