Key Limitations of Wi‑Fi Real‑Time Location Systems

Wi‑Fi real‑time location systems (RTLS) rely on tags that broadcast Wi‑Fi signals to multiple access points throughout a building. By measuring the time of arrival (TOA) and received signal strength indicator (RSSI), the network can triangulate a tag’s position.

While Wi‑Fi RTLS can leverage existing wireless infrastructure and offers greater accuracy than proximity‑based solutions—thanks to time‑of‑flight calculations over a wide bandwidth—there are significant limitations that can undermine its effectiveness.

The Key Limitations of Wi‑Fi RTLS

1. High Power Consumption and Cost
   Wi‑Fi tags are the most power‑hungry, largest, and second most expensive RTLS tags on the market. For example, an AeroScout tag retails around $60, with some models costing up to $95. The batteries often last only a few days, making the solution impractical for disposable or ad‑hoc assets.
2. Complex Installation
   Deploying a Wi‑Fi RTLS requires a detailed site survey, walking around the building with calibration devices to map access point coverage. Because the system sits atop the existing IT network, IT teams must be heavily involved, and each additional access point can cost several thousand dollars.
3. Limited Support for TOA Algorithms
   Accurate indoor positioning with Wi‑Fi RTLS depends on infrastructure that supports TOA algorithms. Very few vendors provide such hardware, limiting the performance gains that can be achieved.
4. Software Licensing Costs
   In many cases you must license a location engine or middleware to translate raw data into usable coordinates, adding to the overall expense.
5. Security Concerns
   Adding unmanaged Wi‑Fi endpoints to your corporate LAN increases exposure to potential threats. Even though RTLS traffic is minimal, the presence of extra endpoints can create new attack vectors.
6. Need for Numerous Access Points
   To achieve sub‑meter accuracy you often need four to five times more access points than a typical data‑traffic network. This escalates infrastructure complexity, cost, and can introduce channel‑management issues—especially on the congested 2.4 GHz band—potentially degrading the performance of your primary Wi‑Fi network.

In Summary

Even when a facility already has Wi‑Fi coverage, the need for precise location, tag cost, and deployment challenges warrant a careful evaluation of Wi‑Fi RTLS. We recommend comparing it against alternative asset‑tracking technologies before committing.

For a deeper dive into the various asset‑location solutions and guidance on selecting the right one for your environment, download our free white paper.