Wi-Fi or Bluetooth (BLE): which technology to use for locating in a hospital

Published on November 7, 2026 · 7 min read

The question comes before the technology

No technology is best at everything. Locating a staff member walking through the building is different from locating a cart parked in a hallway, and each case calls for a different type of device and a different cost.

So the useful question is what you want to locate and with what level of precision. The hospital chooses according to the cost and precision it needs, and can use more than one technology at the same time.

How Wi-Fi locates

A Wi-Fi signal gets weaker with distance and with walls. At each point in the building, each anchor arrives with a different strength, and the set of those strengths works as a fingerprint of that place.

1. The device listens. The eCom measures the signal strength of the anchors around it.
2. It compares with the radio map. The map stores, floor by floor, the expected fingerprint of each point.
3. It calculates the most likely point. A probabilistic engine picks where that combination of signals is most likely to occur.
4. It follows the movement. When the device moves, the system uses the recent history to smooth and confirm the position.

How BLE locates

A beacon is a small tag that announces its code over Bluetooth Low Energy. It does not talk to the hospital on its own: the BLE gateway does, a fixed receiver that listens for beacons and reports what it heard.

1. The beacon announces. It repeats its code from time to time.
2. The gateways measure. Each gateway that hears it reports the signal strength it received.
3. The platform combines the reports. With the reports from several gateways and the radio model of the floor, it estimates the position.
4. It delivers the best level possible. The result can be the point on the map, the room, the floor or proximity.

What each one is good for

Each technology suits one type of item better:

1. Wi-Fi. Locates staff with the eCom, using the network the hospital already has. The eTag, a smart tag that talks over Wi-Fi, is located the same way.
2. BLE. Good for carts, infusion pumps and other mobile equipment. The platform processes hundreds of beacons at the same time.
3. RFID. For boxes, trays and kits at passage points. It records presence and passage at known places, with no battery in the tag.
4. GNSS. Satellite location in outdoor areas, with the eCom+.

How the technologies coexist

In SigaME, each technology keeps its own location engine, and the result converges into a common format: place, floor and time. On screen, the hospital sees everything on the same map, without separating what came from Wi-Fi from what came from BLE.

The two meet in a few places. The eTag, besides being located by Wi-Fi, can serve as a gateway for BLE beacons. The staff member's phone, with SigaME Mobile, reads Wi-Fi and Bluetooth signals so the system knows where it is.

What each one does not promise

In both, the quality of the position depends on coverage. With Wi-Fi, the better distributed the anchors, the better. With BLE, the same goes for the gateways.

Radio signal changes when the building changes. That is why the survey, self-calibration and quality dashboards exist, and they warn when it is time to recalibrate. And the system never promises more than it knows: it shows the point on the map when it has evidence and, when it does not, only the room, only the floor or proximity.

How to choose

Choose by the problem that weighs most today. If the interest is knowing where people are and sending tasks to whoever is closest, Wi-Fi with the eCom is the starting point. If the problem is finding carts and infusion pumps, BLE is the natural option.

You can start with one technology and add the others later, because they all run on the same platform. To compare vendors with some method, the list of questions in the RTLS article helps organize the conversation.