What are deployment challenges in a high ceiling environment?
A. The high ceiling degrades the RSSI versus distance relationship and results in lack of strong RSSI to locate the device closer to the AP. Figure 2 – Very little RSSI variation with distance in high ceiling environments As seen from the previous figure, the change in RSSI between AP and half the inter AP distance (35 feet) is 17 dB for an AP placed at ten feet high while only 3 dB for AP placed at 23 feet high. As RSSI location algorithms depend on RSSI values to determine location, a large change in RSSI is desired over small distances, in order to achieve granular distance resolution. Note that beyond 35 feet, the device is expected to fall within the steep RSSI curve of a neighboring AP, due to 70 feet inter AP spacing. Such steep RSSI characteristics from the nearest AP, along with neighboring APs, contribute towards good location accuracy. So usually for higher ceilings, a combination of more APs and directional antennas, which point to the floor, can be required in order to imp
