“We need real-time tracking” is one of the most common requests we field — and one of the most ambiguous. Real-time location can be built on at least three different radio technologies, and they are not interchangeable. Active RFID, Bluetooth Low Energy (BLE) and passive UHF each answer a different question about range, battery life, cost per tagged item and positioning accuracy. Pick the wrong one and you either overspend on battery-powered tags you did not need, or you discover your “tracking” only fires at choke points. Here is how to tell them apart.
The three approaches in plain terms
Passive UHF tags have no battery. They harvest power from the reader’s radio energy, reflect a signal back, and fall silent. That makes them extremely cheap per unit and effectively maintenance-free, but they only “exist” when an item passes within range of a reader — typically up to around twelve metres for a fixed reader. Passive UHF tells you an item was seen at this reader, not where it is right now.
Active RFID tags carry their own battery and broadcast on their own schedule. Because they are not waiting to be energised, their range is far greater — Identium’s active RFID and RTLS solution works at read ranges up to 100 metres — and they update continuously rather than only at gates. The trade-off is cost and lifecycle: each tag is a small powered device with a battery measured in years, so you tag fewer, higher-value things.
BLE beacons are the middle path. A BLE beacon is a small battery-powered transmitter that advertises on the licence-exempt 2.4 GHz band, picked up by gateways or smartphones. Our BLE beacons family spans 18 form factors with battery life up to five years, supports iBeacon and Eddystone, and — with Angle-of-Arrival anchors — reaches sub-metre positioning accuracy. BLE rides on infrastructure that is already everywhere, which keeps it economical at scale.
How they compare
| Factor | Passive UHF | Active RFID | BLE Beacons |
|---|---|---|---|
| Tag battery | None | Years | Up to ~5 years |
| Typical range | Up to ~12 m | Up to ~100 m | Tens of metres |
| Cost per tag | Lowest | Highest | Low to moderate |
| Positioning | Zone at reader | Zone / movement | Sub-metre with AoA |
| Best for | High-volume items, choke points | High-value assets, large yards | Indoor people and asset positioning |
A decision path you can run
Do you need continuous position, or just confirmation an item passed a point? If you only need to know that a pallet went through a dock or a file left a room, passive UHF is the most economical answer by a wide margin. There is no battery to replace and tags cost a fraction of powered alternatives.
How many items are you tagging, and how valuable are they? Tagging tens of thousands of low-value items rules out battery-powered tags on cost alone — passive UHF is the only sane choice there. Tagging a few hundred high-value assets, vehicles or pieces of equipment across a large site is exactly where active RFID earns its premium.
How large is the area, and is it indoors? A sprawling yard, plant or campus where you need to locate assets anywhere, not just at gates, points to active RFID’s 100-metre reach. A multi-floor indoor environment where you want to know which room or zone someone or something is in — and you want that down to roughly a metre — is BLE-with-AoA territory.
Do you want phones to be part of the system? BLE has a unique advantage: smartphones already speak it. If you want staff or visitors’ phones to detect beacons, or to use phones as readers, BLE is the natural fit. Active RFID and passive UHF need dedicated reading hardware.
They are not mutually exclusive
The most robust deployments often blend approaches. A logistics site might tag every carton with passive UHF for goods-in and dispatch, while a smaller fleet of forklifts and high-value tools carries active RFID for live location across the yard. A hospital might use BLE for indoor staff and equipment positioning while passive UHF handles consumable inventory. The technologies layer cleanly because they answer different questions.
Our default starting point for India
If your need is genuinely “where is everything, right now, across a big area,” start with active RFID and the RTLS platform. If it is “precise indoor positioning, ideally using existing phones or light infrastructure,” start with BLE. If it is “track high volumes economically at known points,” passive UHF wins. All three are designed and supplied for Indian deployments — passive UHF on the WPC-sanctioned 865–867 MHz band, BLE and active on the licence-exempt 2.4 GHz band, which needs no frequency licence.
Want help mapping your tracking requirement to the right radio? Tell us the area size, item count and accuracy you need, and contact our team for a recommendation.