352-001 · Question #254
You have been asked to design a wireless network solution that will implement context-aware services on an existing network that was initially deployed for data traffic only. Which two design principl
The correct answer is B. Add access points along the perimeter of the coverage area. C. Install additional APs in monitor mode where the cochannel interference would otherwise be affected.. Improving location accuracy for context-aware services requires adding perimeter APs for better triangulation and deploying monitor-mode APs that passively track clients without disrupting the existing data network.
Question
You have been asked to design a wireless network solution that will implement context-aware services on an existing network that was initially deployed for data traffic only. Which two design principles would you follow to increase the location accuracy with the least possible impact on the current setup? (Choose two.)
Options
- AUse directional antennas to provide better cell separation.
- BAdd access points along the perimeter of the coverage area.
- CInstall additional APs in monitor mode where the cochannel interference would otherwise be affected.
- DIncrease the AP density to create an average interaccess point distance of less than 40 ft.
- EFine tune the access points radio configuration to have a higher average transmission power to
How the community answered
(24 responses)- A8% (2)
- B75% (18)
- D13% (3)
- E4% (1)
Why each option
Improving location accuracy for context-aware services requires adding perimeter APs for better triangulation and deploying monitor-mode APs that passively track clients without disrupting the existing data network.
Directional antennas reduce the overlapping signal coverage and RSSI diversity required for accurate triangulation and would require reconfiguring existing infrastructure.
Perimeter APs expand the geometric spread of RSSI measurement points, improving the angle diversity needed for accurate multilateration without requiring modifications to interior data-serving APs.
Monitor-mode APs passively listen to client radio frames and report RSSI data to the WLC or MSE for location calculation, adding location sensing capability without associating clients or interfering with co-channel traffic from existing APs.
Reducing inter-AP distance to under 40 ft requires deploying many additional full-service APs across the entire area, which has a significant cost and configuration impact on the existing setup.
Higher transmission power increases co-channel interference and compresses the RSSI gradient differences between APs, which degrades location accuracy rather than improving it.
Concept tested: Wi-Fi location accuracy design for context-aware services
Source: https://www.cisco.com/c/en/us/td/docs/solutions/Enterprise/Mobility/WiFiLBS-DG/wifich2.html
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