The Received Signal Strength Indicator (RSSI) is the received field strength indicator of a mobile station. The RSSI value is an important indicator of the radio channel and received field strength.
The RSSI indicator is a parameter that includes the total received signal strength for the radio channel width, including interference and thermal noise. It depends on the transmit power (EIRP) of the radio station and the distance between the radio station and the mobile station.
The RSSI value is measured by the connected stations in various mobile radio systems and also in other radio-based transmission systems, and in the event of strong field strength drops, it is used to switch to another radio channel.
RSSI802.11, in Long Term Evolution (LTE) and in Bluetooth, among others. The field strength value comprises 1 byte and is used to indicate the field strength of the received hotspots. The reference quality value, the Reference Signal Receive Quality (RSRQ), is calculated from RSSI and the receive field strength of the reference signal, the Reference Signal Receive Power (RSRP).
RSSI technology also has a practical application in the electronic locking system Passive Keyless Go (PKG) in automotive technology. This technology determines whether the car key is inside or outside the vehicle.