Users Guide

Dell PowerConnect W-AirWave 7.5 | User Guide Using VisualRF | 279
Increasing Location Accuracy
The Location Service will use all RF information available to increase location accuracy of clients, tags, and rogue
devices. Understanding your infrastructure's inherent capabilities helps you learn the extra effort required to
ensure location accuracy.
There are three key elements read from controllers or access points that increase location accuracy:
 Signal strength of a client as heard by the AP of association
 Signal strength of a client as heard by APs other than the AP of association
 Signal strength at which an AP hears other APs.
These factors are detailed further in Table 147:
AirWave provides four main methods to increase accuracy once your access points are deployed:
 Adding Exterior Walls - increases location accuracy by reducing the statistical probability of placements
outside the office confines. See “Adding Exterior Walls” on page280.
 Client Training for Stationary Devices - ensures non-mobile clients like desktops or scales will always remain
in a defined static location. Statically assigning non-mobile devices reduces the CPU load on your server
because VisualRF does not evaluate any signal metrics for this MAC address when associated with an AP on
the floor plan. See “Location Training for Stationary Devices” on page281.
 Remote Client Surveys - provides additional attenuation inputs for corners and low-coverage areas without
the burden of actually carrying a laptop to the physical location. See “Adding Client Surveys” on page281.
 Location Probability Regions - Probability regions will increase or decrease the chances of a device being
located within the region. See “Adding Location Probability Regions” on page283.
Table 147 Elements Read From Controllers to Increase Location Accuracy
MFG/Model Client Signal Associated AP
AP-to-AP Signals
(Dynamic Attenuation)
Unassociated
Client Signal
Rogue AP
Signal
Dell Yes Yes Yes Yes
Cisco LWAPP Yes Yes Yes Yes
Cisco IOS Yes No No With WLSE
Cisco VxWorks Yes No No No
Trapeze Yes No No Yes
Meru No No No Yes
Proxim Yes Yes Yes Yes
Symbol Auton. AP Yes No No Yes
Symbol Thin AP Yes No Yes Yes
Proxim AP-2000 Yes No Yes Yes
Proxim AP-4000 Yes Yes Yes Yes
ProCurve WeSM Yes Yes No Yes
ProCurve 530 Yes Yes Yes Yes
ProCurve 420 Yes Yes No Yes