A wireless engineer needs to implement client tracking. Which method does the angle of arrival use to determine the location of a wireless device?

Angle-of-Arrival (AoA) location systems compute a client’s position by measuring the angle at which the RF signal reaches a multi-element antenna array on each access point; this measured angle is the signal’s angle of incidence and is then intersected from two or more APs to pinpoint the device. No RSSI values or time-difference metrics are required—only the incident angle.

A. Received signal strength: AoA algorithms do not use RSSI power levels; RSSI underpins trilateration, not angle measurements.
B. Triangulation: Generic term; AoA is the specific technique of using incident angles, not the broader geometric process.
C. Time distance of arrival: Involves measuring propagation time differences (TDoA) rather than angles; unrelated to AoA computations.

1. Cisco Systems, “Cisco Hyperlocation Solution Design Guide,” v2, §2.2 “Angle-of-Arrival (AoA) Fundamentals,” pp. 11-12.

2. Cisco Systems, “Cisco CMX Configuration Guide, Release 10.x,” Ch. 2 “Location Algorithms,” para. ‘Angle of Arrival’, p. 2-4.

3. Cisco Systems, “Location Architecture for Wi-Fi and RFID,” white paper, 2013, §3.1 “AoA—Incident Angle Measurement,” p. 7.