Why Is Hyperlocation Location Accuracy Poor on an AireOS WLC?
An engineer configures an AireOS WLC v8.2 that has Cisco Aironet 3700 Series APs and Cisco Hyperlocation modules. The engineer deploys and enables a WLAN that has Hyperlocation. During testing, the engineer notices poor location accuracy when the packets arrive. Which action resolves the issue?
Community Votes
83% of anonymous learners picked answer C. Votes are pick records left by other test-takers — they are not the verified answer.
Community Insight
This item tests the Cisco Hyperlocation troubleshooting sequence for "poor location accuracy when packets arrive" — the trap is assuming the WLC 8.2 image lacks Hyperlocation support and jumping to a software install (D) instead of allowing RRM and module calibration time.
On an AireOS 8.2 WLC with Cisco Aironet 3700 Series APs and Hyperlocation modules, poor location accuracy once packets arrive is a calibration/RRM settling problem rather than a code or port problem. The documented fix is to let RRM settle for 60 to 90 minutes before recording location measurements, so answer C is the correct resolution.
Choosing D, installing WLC software that supports the Hyperlocation module, because learners assume the poor accuracy means the 8.2 image is incompatible — but AireOS 8.2 already supports 3700 Series Hyperlocation, so no code change is required.
Community Discussion (5 comments)
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Expert Analysis
Why the Answer Is Correct
Cisco's Hyperlocation Best Practices and Troubleshooting Guide lists the exact symptom in this question — "Poor location accuracy when packets arrive" — under the Hardware heading, and the corrective actions are time and calibration related, not software related. The guide directs you to confirm NTP is up and that the WLC, MSE/CMX and PI share the same NTP source, to record AP tilt and azimuth accurately on the PI maps, and then to "Allow 60-90 minutes for RRM to settle" before taking location measurements. While RRM recalculates channel, power and antenna/phase calibration, the Hyperlocation module is also calibrating against the environment, so any readings taken immediately after enabling the WLAN will be skewed. Because the platform here is already an AireOS 8.2 WLC with 3700 Series APs and Hyperlocation modules attached, the remaining variable is settling time, making C the only action that matches the documented remedy. The WLAN itself is already deployed with Hyperlocation enabled, so the deployment-side prerequisites are satisfied.Why the Other Options Are Wrong
Option D is the most tempting distractor: Hyperlocation on the 3700 Series does require a WLC image that supports it, but the scenario already states the controller is running v8.2, the release line that introduced Hyperlocation support on AireOS, so reinstalling code addresses a problem that does not exist here. Option B is wrong because Hyperlocation is enabled per-WLAN on the AireOS controller rather than as a global configuration toggle, and the question already says the WLAN with Hyperlocation was deployed and enabled; a global setting could not retroactively fix an accuracy symptom. Option A is wrong because opening SNMP 161 and NMSP 16113 is about connectivity between the controller and the location/management infrastructure — NMSP is used for CMX/MSE communication — not about the accuracy of the computed coordinates, and these are not "closed ports" you would open to improve accuracy. Neither port change nor a global toggle addresses the settling/calibration behavior described in the symptom.Community Comment Notes
Supersede quotes the troubleshooting page directly, noting "Poor location accuracy when packets arrive: Ensure NTP server is up and running" and then pointing to the 60-90 minute RRM allowance, which is the same guide text this question is drawn from. largestyle linked the Hyperlocation best practices and troubleshooting guide and summarized it with "the answer is to wait 60-90 mins", and masters777 added that RRM must stabilize and the module must calibrate to the environment before measurements are trustworthy. rrahim reported changing an AI model's answer to C after seeing that source. robi1020 argued for D, reasoning that the Hyperlocation module needs compatible WLC code — a reasonable concern in general, but not applicable once v8.2 is confirmed in the scenario. The vote split (C well ahead of D) matches the documented guidance rather than a guess.Official Reference
Exam Strategy
When a wireless question pairs an already-supported controller release with a location-accuracy symptom, eliminate any option that reinstalls code or re-enables a feature that the stem says is already working. Then look for the documented operational step — here, giving RRM and the Hyperlocation module 60-90 minutes to settle before you trust the data.
Frequently Asked Questions
Why isn't installing WLC code that supports Hyperlocation the right fix?
The stem already states the controller runs AireOS v8.2, the release that supports Hyperlocation on 3700 Series APs, so the code requirement is satisfied and reinstalling software does not address the accuracy symptom.
Why would NTP and AP tilt/azimuth be checked before blaming RRM settling?
Cisco's troubleshooting guide lists NTP sync across WLC, CMX/MSE and PI plus accurate tilt and azimuth on the maps as prerequisites; once those are verified, the remaining documented step is allowing 60-90 minutes for RRM to settle.