Received Signal Strength Indication
The Received Signal Strength Indicator (RSSI) is an indicator for the reception field strength of wireless communication applications.
Since the RSSI is a ratio, the value must be interpreted depending on the respective application. There are also various definitions within the IEEE 802.11 standard, with a higher value corresponding to better reception. In test receivers, the RSSI value can also be output as an analog voltage at a separate connection for further processing. With a device-dependent scaling factor, the RSSI value can be expressed as a power level in the unit dBm or ASU ( Arbitrary Strength Unit ).
use
This indicator is used by cell phones , radio frequency modules, and other systems that rely on radio communications to find or switch to a usable channel for communication . If the signal strength that is required for successful communication is not reached on the currently used channel, the RSSI value can be used to switch to a better channel if necessary. Current smartphones usually allow you to sort the reachable WLAN access points according to reception strength or alphabetical order.
Individual evidence
- ↑ IEEE 802.11 14.2.3.2 and 14.5.5.8.2
- ↑ ASU - Arbitrary Strength Unit on www.lte-dienstleistungen.info