Not every 5G device needs gigabit speed and four antennas. RedCap — reduced-capability NR — is a true 5G device stripped back to be cheaper and lower-power, filling the gap between low-power IoT and full broadband for wearables, sensors and cameras.
5G grew up at two extremes: full NR for gigabit broadband, and NB-IoT and LTE-M for tiny, low-rate sensors. Between them sat a large class of devices — wearables, industrial sensors, surveillance cameras — that need more than LPWA but nothing like full NR, and for which a full 5G modem is too expensive and power-hungry.
RedCap (reduced-capability NR), also called NR-Light, is the 5G answer. It is a real NR device — it works on a standalone 5G network and can use slicing, positioning and the rest — but deliberately simplified so it is cheaper, smaller and lasts far longer on a battery.
The simplifications are specific. The bandwidth is capped at 20 MHz in FR1 (against 100 MHz for full NR), which shrinks the radio and the baseband. The device needs only one or two receive antennas instead of four, halving RF chains. It can be half-duplex, so it need not transmit and receive at once. Fewer MIMO layers and relaxed processing round it out.
Together these cut cost, size and power substantially while keeping a peak rate around 85–150 Mbps — ample for a camera or a sensor gateway. eRedCap (enhanced RedCap) goes further, down to roughly 10 Mbps with even lower complexity, for devices closer to the LTE-M tier.
RedCap competes from both sides. Against LTE-M and NB-IoT it offers much higher rates, lower latency and a path onto a pure 5G standalone network as 4G is refarmed. Against full NR it offers a large saving in cost and power for devices that never needed the headroom.
The natural homes are wearables (smartwatches, medical monitors), industrial wireless sensors and actuators, and video surveillance where a modest, steady stream matters more than peak speed. For an operator, RedCap keeps these devices on the 5G core rather than stranded on an ageing 4G network.
The appeal is a genuine 5G device at a cost and power point close to LTE — but the simplifications have to be designed in, not assumed. The reduced antenna count affects the link budget and coverage, so a RedCap device may reach less far than a full-NR one and the antenna design matters more. Half-duplex changes the timing and throughput envelope. And the device still has to carry the full 5G NAS and security stack even as the radio shrinks.
The result is worth it where volume and battery life dominate: a modem and RF front end tuned for 20 MHz and one or two antennas, a power profile built around deep sleep, and a bill of materials that competes with LTE while speaking native 5G.
Reduced-capability NR, also called NR-Light: a true 5G device deliberately simplified — narrower bandwidth, fewer antennas, optional half-duplex — to be cheaper and lower-power than full NR. It targets wearables, industrial sensors and video surveillance.
It caps bandwidth at 20 MHz in FR1 (vs 100 MHz), uses one or two receive antennas (vs four), can be half-duplex, and uses fewer MIMO layers. Peak rate is around 85–150 Mbps rather than gigabit, cutting cost, size and power substantially.
eRedCap (enhanced RedCap) is an even lower-complexity tier, reaching roughly 10 Mbps, for devices closer to the LTE-M class. Standard RedCap reaches about 85–150 Mbps. Both are simplified NR devices on a 5G network.
RedCap offers much higher data rates and lower latency than NB-IoT and LTE-M, and runs natively on a 5G standalone network. It sits above them and below full NR, for devices that need more than LPWA but less than broadband.
Wearables such as smartwatches and medical monitors, industrial wireless sensors and actuators, and video surveillance — devices that need a steady, modest connection, long battery life and low cost rather than peak speed.
The reduced antenna count affects link budget and coverage, half-duplex changes the throughput and timing envelope, and the device still carries the full 5G security and NAS stack. The RF front end and power profile must be designed for 20 MHz and one or two antennas to hit the cost and battery targets.
The LPWA tier below.
KNOWLEDGEWhere RedCap fits the map.
KNOWLEDGEThe power budget.
KNOWLEDGERedCap vs the alternatives.
KNOWLEDGEA RedCap device can use slices.
KNOWLEDGEBands RedCap runs on.
A genuine 5G device at an LTE cost and power point means designing the simplifications in — the RF front end for 20 MHz and one or two antennas, and a power profile built around deep sleep. Tell us the device.