Cisco
300-430 · Question #96
300-430 Question #96: Real Exam Question with Answer & Explanation
The correct answer is A: Time Difference of Arrival. TDoA (Time Difference of Arrival) delivers the highest indoor location accuracy by computing position from precise signal arrival-time differences measured across multiple reference points.
Advanced Location Services
Question
An engineer must achieve the highest level of location accuracy possible for a new mobile application. Which technology must be implemented for this use case?
Options
- ATime Difference of Arrival
- BBluetooth Low Energy
- CRSS lateration
- DToA lateration
Explanation
TDoA (Time Difference of Arrival) delivers the highest indoor location accuracy by computing position from precise signal arrival-time differences measured across multiple reference points.
Common mistakes.
- B. Bluetooth Low Energy uses proximity zones or RSSI-based ranging with typical accuracy of 1-3 meters, which is useful for coarse location but falls well short of the sub-meter precision achievable with TDoA.
- C. RSS (Received Signal Strength) lateration is significantly degraded by multipath interference and environmental absorption, yielding typical accuracy of 3-10 meters - far below what TDoA achieves under the same conditions.
- D. ToA (Time of Arrival) lateration requires precise time synchronization on both the transmitting client and the receiving infrastructure, making it impractical for standard mobile devices and generally less accurate than TDoA in real-world deployments.
Concept tested. Wireless location accuracy - TDoA vs RSSI vs BLE methods
Topics
#TDOA#location accuracy#BLE#lateration
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