implementation details
Area to be monitored is divided up into “cells” - each with antennas & controller
Coarse-grained location first (which cell?), then fine-grained location within the cell
- Query driven: “Tag 5 raise your hand!”, or
- Tag driven: all tags periodically beacon (impl.)
Tag beaconing frequency might depend on inertial system
Collision reduction through various techniques, including reducing beacon time
- They note non-linear increase in perf due to this