How to choose an indoor positioning technology? UWB, BLE, RFID and anchor-based approaches

Why does long-term care need indoor positioning?

The starting point is simple: satellite positioning does not reach inside buildings. Shielding from walls and floor slabs makes outdoor satellite positioning fail indoors, so long-term care facilities need anchor-based indoor wireless positioning to keep track of residents' movements within buildings and grounds. The goal is not to draw fine-grained coordinates, but to give the care team continuous awareness of residents' movements and locations.

In practice, residents spend most of their time indoors, while the grounds often include courtyards, parking areas and adjacent roads; indoors-only tracking loses residents the moment they walk out the gate, and outdoors-only tracking does not reach the rooms. The market already has positioning solutions aimed at long-term care — such as P2 Positioning's long-term care application and Fusionnet's geofencing wandering-prevention case (both are market examples, not endorsements of partnership) — which can serve as references for understanding how such applications look. When choosing an indoor positioning technology, buyers usually weigh how outdoor coverage hands over to indoor, so location information stays continuous between indoors and outdoors.

Comparing the four common technologies

Choosing an indoor positioning technology comes down to balancing the accuracy you need against your budget. Common technologies fall into four groups: UWB stands out for centimeter-level accuracy; BLE (Bluetooth) sits between one and several meters; active RFID excels at entrance/exit and zone detection; satellite positioning covers outdoor movement. The table below summarizes the typical accuracy, deployment approach and suitable scenarios of the four technologies for side-by-side comparison.

The accuracy figures in the table are typical values; actual performance is affected by site structure, obstructions and anchor placement, and the same technology can produce clearly different results in different buildings. When comparing technologies, the standard should be "can this accuracy be achieved in my facility", not the spec sheet alone; feasible anchor placement and accuracy must be confirmed by the adoption team after a site survey.

Four selection considerations

To choose an indoor positioning approach, work through four considerations item by item: site size and floor layout, the purpose of the accuracy, deployment and maintenance costs, and privacy governance. Together these determine which technology and configuration fit the facility, and they also shape the later operational burden and resident trust.

First, site size and floor layout determine the number of anchors and how hard placement is — floor slabs, corridors and elevators all affect signal coverage. Second, clarify the purpose of the accuracy: if the goal is zone alerts (a reminder when a resident leaves a floor or approaches an exit), zone-level accuracy is enough; reviewing fine-grained trajectories is what requires higher accuracy and denser anchors. Third, deployment and maintenance costs include equipment, installation work, power and later calibration; the larger the scale and the higher the density, the heavier the operational burden. Fourth, privacy governance should be agreed in advance: who can view location, how long data is retained, and how access is tiered by role — these rules should be confirmed in writing before adoption.

The indoor/outdoor handover gap

Another often-underestimated element is the handover gap: when residents pass through the gate, if outdoor satellite positioning and indoor wireless positioning cannot connect, the moment they cross the doorway is where the location blank begins. Dual-mode solutions pair outdoor satellite positioning with indoor wireless positioning so location information switches automatically at the gate, narrowing this gap.

Handover periods are also the coverage windows facilities most need in practice: a resident walks from indoors to the courtyard and then out the main gate, and alert rules must switch with the location type for on-duty staff to receive notifications in time. During selection, ask vendors to explain how outdoor and indoor positioning hand over and how alert rules take effect across zones, and verify the handover behavior on site — rather than only confirming on a spec sheet that the two systems are listed side by side.

Closing with a site assessment

Back to the starting point of "how to choose indoor positioning": until the site has been surveyed, no fixed anchor count or accuracy figure is enough to serve as a commitment. Needle does not commit to fixed anchor counts or fixed accuracy without a survey; anchor placement and calibration are planned by the adoption team during the site survey, and coverage and accuracy follow the survey and acceptance results.

For the assessment, prepare floor plans, the floor layout, residents' daily movement patterns and the problems you face today; the adoption team surveys the site and then proposes a configuration and a scope description, after which the technology mix and adoption scope are decided. You can request a site assessment through the website to get a solution description that fits your facility's conditions.

Frequently asked questions

Sources

• P2 Positioning | Positioning system application in long-term care (market example)
• Fusionnet | Geofencing wandering-prevention case (market example)

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Further reading