“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 |
Ambient IoT, and why it is not yet on this list
One more technology keeps appearing in RFID trade coverage, usually presented as something you could specify this year. It deserves a straight answer.
Ambient IoT means a tag with no battery that harvests ambient radio energy, stores it, and then does something with it. Two physically different designs sit under that one label, and conflating them is the commonest error in the coverage:
- Harvest, then actively transmit. Wiliot’s IoT Pixel is the product you are most likely to be offered. Per the vendor’s own product page (accessed 26 September 2026), it harvests on two bands — a sub-1 GHz antenna energising at up to about 40 m, and a 2.4 GHz antenna at up to about 3 m — then broadcasts an ordinary Bluetooth Low Energy 5.2 non-connectable advertising packet at −20 dBm EIRP, quoted as readable at up to about 40 m. The Gen3 version announced in January 2026 adds temperature, humidity and light sensing alongside dwell and movement, though sensing is variant-dependent: the vendor prices humidity-capable units higher. This is not backscatter, and it is not RAIN RFID.
- Backscatter under a formal standard. 3GPP’s Release 19 ambient IoT work specifies a roughly 1 µW “device 1” with an RF envelope-detector receiver that reflects an external carrier wave, in licensed cellular spectrum. For an RFID audience the honest description is that this is a passive tag with a cellular network as the interrogator. The novelty is who owns the reader estate, not the tag physics.
The first design’s real attraction is the one BLE already has on this page: an ordinary BLE receiver — a phone, or a gateway you already own — can pick up the advertisement and relay it, so there is no UHF reader estate to buy. Read that claim precisely, though. The payload is AES-128 encrypted and, by the vendor’s own description, decryptable only inside its platform, so a passing phone relays data into the vendor’s cloud rather than reading a tag for you. And the tags still have to be energised: sub-1 GHz energising infrastructure is a purchase the tag price does not include.
| Factor | Ambient IoT (energy-harvesting BLE) |
|---|---|
| Tag battery | None — harvests ambient RF, then transmits on its own |
| Typical range | Vendor-stated ~40 m broadcast; energising ~40 m at sub-1 GHz, ~3 m at 2.4 GHz |
| Cost per tag | Highest of the four, and the published tag price excludes a platform subscription you cannot decline |
| Positioning | Presence and dwell wherever a BLE receiver is listening, plus sensor data |
| Best for | Battery-free sensing pilots, not general identification |
| Supplied by Identium | No |
What an Indian procurement runs into in 2026
The open question is Indian approval, not the frequency. Long-range harvesting depends on sub-1 GHz energy, and the vendor documents two sub-1 GHz options: 902–928 MHz for the United States and “most regions”, and 868 MHz for part of the EU. That second option sits inside the range India’s rules cover, so the frequency itself may not be the obstacle. India’s licence-exempt short-range-device rules for RFID were notified as G.S.R. 853(E) on 10 December 2021, superseding the 2005 rules that specified 865–867 MHz — which is why 865–867 MHz is still widely quoted, and why equipment type-approved under those earlier rules remains valid for its service life. The 2021 rules place RFID in the 865–868 MHz range and permit 2 W e.r.p. interrogator power only in four 200 kHz channels, centred at 865.7, 866.3, 866.9 and 867.5 MHz. What we could not establish from public sources as of 26 September 2026 is whether the 868 MHz harvesting variant is offered for India, or whether any part of the system — tag or energising bridge — holds WPC or ETA approval here. Treat that as a question to put to the vendor in writing, not as a settled no, and see our BIS and WPC compliance guide for why the approval answer decides whether you can switch anything on. Confirm the current allocation and its conditions with WPC or your own compliance advisor before committing. Falling back to a 2.4 GHz-only tag sidesteps the question, but drops energising range from roughly 40 m to roughly 3 m on the vendor’s own figures, which multiplies the number of energisers across a warehouse.
The tag price is not the price. Wiliot publishes a figure of as low as 10 cents at high volume, and around 12 cents for humidity-capable variants (vendor product page, accessed 26 September 2026). That is hardware only. Because the payload is decryptable only inside the vendor’s platform, the cloud subscription is structurally mandatory, and its price is not published anywhere we could reach; energising bridges and label conversion sit outside that figure too. On the other side of the comparison, nobody publishes an audited price for a plain passive UHF inlay. The only attributable anchor we found is a July 2026 GeekWire profile of Impinj putting its chips at a few cents each — and a chip is not a finished inlay. So resist any precise multiple. The direction is not in doubt, and the recurring platform cost has no equivalent on the passive side at all. Our tag price guide sets out what actually drives a passive UHF quotation here.
The standards are young and the supply chain is still being tooled. 3GPP completed Release 19 with implementable specifications at the end of December 2025, but we could find no commercial network offering an ambient-IoT service as of September 2026. IEEE 802.11bp, the Wi-Fi ambient-power amendment, is further back: as of its September 2026 session the task group had approved only draft 1.0 for a first working-group letter ballot, with final 802.11 working-group approval scheduled for January 2028 and the remaining ratification steps running into mid-2028 — so standards-compliant Wi-Fi silicon is not something you can put in this budget cycle. On manufacturing, Wiliot and CISC Semiconductor announced on 25 August 2026 that CISC had adapted its BLE Xplorer tester for IoT Pixels, rated at up to 6,500 units per hour on a single-station basis against about 1,500 for conventional stop-and-go testing. Both halves of that ratio come from the same joint release, and both describe a rated capability rather than a published production result. Pre-sales were to begin in September 2026, with first customer deliveries scheduled for the end of Q3 2026. Our reading of why a buyer should notice: high-volume test was worth a partnership announcement at all, which is what you would expect of a category still industrialising.
The volume gap is roughly 300 to one. The RAIN Alliance reported 42.7 billion RAIN tag chips shipped in 2025 — see our briefing on those figures for the caveats that come with a member-reported total. ABI Research’s 1Q 2025 research highlight put ambient IoT at roughly 142 million devices in 2024 across all protocols, reaching about one billion by 2030. The years do not line up and the two counts are not measuring the same object, so read it as an order-of-magnitude gap rather than a clean ratio: about 300 times on those numbers, and still about 40 times against the 2030 ambient forecast if RAIN volumes merely held flat. The largest deployment anyone has announced — Walmart’s stated goal of 90 million Wiliot pixels on pallets by the end of 2026, across 4,600 stores and more than 40 distribution centres, up from about 500 stores when it was announced in October 2025 — would be around 0.2% of a single year’s RAIN chip shipments.
What it is actually for
The money behind it is real, and separate from everything above. On 27 April 2026 — five months before the CISC announcement, and unconnected to it — Avery Dennison made a USD 75 million strategic minority investment in Wiliot, taking a seat on the board alongside its existing observer position and becoming Wiliot’s preferred inlay design, manufacturing and commercial partner. No valuation was disclosed. The most useful line in that announcement came from the company writing the cheque: Avery Dennison’s Francisco Melo said “BLE is a complementary technology to RFID. It increases the total addressable market.” Complementary, and additive. Not a replacement.
That matches what the technology is good at. Ambient IoT competes with temperature data loggers and semi-passive sensing tags, not with the inlay on a garment hangtag. Measured against a plain identification inlay it is expensive today, and structurally so, because it carries sensing and a platform dependency an inlay does not need — Wiliot’s own Gen3 launch claimed significantly lower unit costs without attaching a figure to the claim, which is worth watching rather than budgeting against. Measured against a sensing deployment it looks cheap. If your requirement is “identify these 40,000 cartons”, it is the wrong tool at any price.
Where Identium stands
We do not make, stock or resell ambient-IoT or energy-harvesting Bluetooth tags, and we are not going to pretend otherwise to keep a quotation open. If your requirement is genuinely battery-free ambient sensing, go to that vendor directly and ask the two questions above: Indian approval in writing, and total cost including the platform.
We also do not stock sensor or temperature-logging RAIN tags, which is the adjacent thing people assume we must have. If cold-chain temperature history is the real requirement, read our cold chain monitoring guide and treat tag sourcing as a separate exercise.
What we do supply is the three options in the table above: passive UHF tags, labels and inlays manufactured at our New Delhi factory; UHF readers and antennas, each shipped with an SDK, demo app and source code; battery-powered BLE beacons in 18 form factors; and active RFID and RTLS. We are BIS certified, and as of 2026 our UHF readers and antennas carry WPC approval for Indian use — allocations and conditions are revised from time to time, so confirm the current position with WPC before a large rollout. The decision path below therefore covers the three technologies you can specify and buy for an Indian deployment today.
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 865–868 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.
Further reading
- RFID vs GPS tracking
- Types of RFID tags explained
- Active RFID / RTLS solutions
- BLE beacons and gateways
If zone-level presence and direction of travel are enough and you do not actually need x, y coordinates, our ID-EA500 edge array reader does that work on the ceiling panel itself, with no middleware server in the loop.