BLE Gateway Location (L1)

Introduction

BLE gateway location is the lowest-effort mechanism. When the device has a BLE connection to a Sidewalk gateway, it signals Amazon Sidewalk, which resolves the device’s position from the gateway’s own known position. The device performs no scan: it only signals over the connection it already has, so there is no device-side measurement to resolve and the fix is entirely gateway-derived.

How the Cloud Resolves the Fix

A BLE uplink is resolved from the position of the gateway (or gateways) that reported the device.

  1. Gateway position lookup. For each gateway that reports the device, Amazon Sidewalk looks up that gateway’s known location.
  2. Inline (bonded) fast path. If the reporting gateway is a PAN gateway that carried its own location inline in the uplink (for example, a mobile-app gateway whose phone supplies GPS), that location is used directly, skipping the lookup, clustering, and validation steps.
  3. Clustering. When a device is reported by several gateways, Amazon Sidewalk clusters the located gateways and derives the fix from the cluster, using the gateway closest to the centroid as the primary gateway. A single reporting gateway yields that gateway’s own position.
  4. Time binning. When gateway reports carry uplink timestamps, they are evaluated in 30-second bins, anchored on the most recent report and walking back through older bins until one resolves, so reports from different passes are not mixed together.

Before a fix is published, Amazon Sidewalk validates it: a BSSID cross-check against the gateway’s known access-point layout (when available), and a speed/plausibility check against the device’s recent location history. A fix that is physically implausible for the device’s movement is not published.

Accuracy and Constraints

  • Requires an active BLE connection to a Sidewalk gateway.
  • Accuracy is gateway-granularity: the fix is the gateway’s position (or a centroid of several gateways), not a measured device position. It is only as accurate as the gateway’s own known location.