UWB vs RFID — cuando gana cada uno.
UWB and RFID get pitched against each other in procurement, but the honest answer is that they're built for different jobs.
UWB tracks real-time position for a relatively small fleet of active tags; RFID confirms presence at read points for thousands of passive tags. This is the operator-level comparison that helps you choose — or, more often, lay out where each belongs in a hybrid stack.
La diferencia de categorías
UWB (Ultra-Wideband) uses time-of-flight measurements between active battery-powered tags and ceiling-mounted anchors to deliver 10–30 cm real-time position with multi-Hz update rates.
RFID (RAIN UHF Gen 2) uses passive tags that backscatter their ID when a reader transmits — confirming presence within the reader's field.
UWB tells you where a thing is right now to centimetres. RFID tells you that a thing was here when the reader fired. Most enterprises that compare them at procurement end up needing both for different parts of the operation.
Precisión — por un orden de magnitud
UWB: 10–30 cm at the 95th percentile in production deployments. RFID: presence confirmation within the reader's read zone (a few metres for handhelds and fixed portals), or 1–3 m for newer RTLS-grade RFID (Zebra ATR7000, RF Controls CISC).
UWB is roughly 10× more accurate than RTLS-grade RFID, and 100× more accurate than basic portal RFID.
If sub-metre precision matters for your use case (collision avoidance, kit assembly, tactical training), UWB. If presence is enough (cycle counts, dock-door reconciliation), RFID.
Etiqueta economía — el factor decisivo para la escala
RFID tags: 3–10 cents for retail inlays, 50 cents to a few Euros for industrial, no batteries, multi-year life. UWB tags: 30–150 Euros each, with battery management overhead.
If you need to track 100,000 garments, items or returnable assets, the tag cost difference is the entire procurement decision — RFID wins by orders of magnitude. If you're tracking 200 high-value pieces of work-in-progress in real time, UWB tag cost barely registers.
Coste y densidad de infraestructuras
UWB anchors: several hundred Euros each, deployed at ~10 m spacing in 3D, wired backbone for synchronisation. A typical 5,000 m² production area needs 30–60 anchors.
RFID fixed readers: similar per-reader cost but deployed only at chokepoints (dock doors, smart cabinets, encoding stations) — a comparable site might need 5–15 readers.
Mobile RFID: zero fixed infrastructure, just handhelds. The infrastructure cost gap matters most for sites where chokepoint reads work; UWB only wins where you genuinely need continuous spatial coverage.
Tasa de actualización y latencia
UWB: multi-Hz to 50 Hz update rates, real-time position. RFID: presence events when items enter a reader's field, no continuous tracking.
For dynamic processes (forklift collision avoidance, sports performance, autonomous-asset interactions), UWB is the only option. For event-driven processes (receiving, picking, shipping), RFID's event model fits perfectly.
Los stacks híbridos son lo habitual
Most large enterprises run both. Examples: an automotive plant uses UWB for WIP tracking on the line (sub-metre needed) and RFID for parts kits at receiving (cheap, bulk reads);
an aerospace MRO facility uses UWB for tool location during work and RFID at smart cabinets for check-in/out; a hospital uses BLE-AoA for staff and equipment workflow and RFID for consumable inventory.
Hybrid is the default outcome at scale — the procurement question is not which, it's where each fits.
Cuando TRACIO elige UWB vs RFID
UWB: collision avoidance, tactical training, sports performance, sub-metre WIP, real-time tool tracking, kit assembly verification, force-on-force training.
RFID: retail item-level, warehouse dock-door reconciliation, pharma serialisation, smart cabinets, tool control, returnable-asset (RTI) tracking, high-value inventory at scale.
We scope the mix in stage 1 of /method based on use cases, not technology preference. See /insights/uwb-explained and /insights/rfid-explained for the deeper individual treatments.
Preguntas frecuentes
¿Pueden UWB y RFID coexistir en la misma infraestructura?
Yes — they operate on different frequencies (UWB sub-GHz to 10 GHz wideband; RAIN RFID at 860–960 MHz) and don't interfere. Many deployments share cabling backbone, network controllers and integration platforms. We design hybrid stacks as a normal output of stage 1.
¿Cuál es más barato de desplegar en general?
RFID a gran escala, por un amplio margen, cuando la presencia es suficiente. UWB tiene costes de etiqueta, ancla e integración más altos, pero ofrece posiciones en tiempo real que RFID no puede.
La métrica correcta es el coste por resultado empresarial, no el coste por etiqueta — modelamos ambos durante la etapa 1.
¿Es el RTLS de grado RFID (controles ATR7000, RF) un sustituto del UWB?
Sometimes. For 1–3 m real-time position on passive tags, RTLS-grade RFID is a strong UWB alternative — especially at scale where tag economics dominate. For sub-metre accuracy, UWB still wins. See /insights/rfid-explained for the RTLS-grade RFID detail.
¿Podemos empezar con RFID y añadir UWB más adelante?
Sí, y a menudo esa es la secuencia correcta. RFID ofrece una recuperación más rápida en precisión de inventario y conciliación de puntos de estrangulamiento; UWB se añade más tarde para los pocos procesos de alto valor que necesitan posición en tiempo real.
Los despliegues faseados son salidas de puerta 1 de /método.
¿Cómo se compara la historia de la integración?
Ambos exponen eventos a sistemas empresariales mediante APIs estándar (MQTT, REST, OPC UA). RFID a WMS / ERP / EPCIS; UWB en MES / sistemas de taller / plataformas de seguridad contra colisiones. Consulta /integraciones para nuestros patrones empresariales.
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