Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

RSSI (Received Signal Strength Indication) and Interference

  1. Mar 19, 2010 #1

    I Want to know: High GSM RSSI mean Interference? the reason behind High RSSI ist only Interference?

  2. jcsd
  3. Mar 19, 2010 #2


    User Avatar

    Staff: Mentor

    Interference or another signal. Where are you seeing this? Here's more info on RSSI:


  4. Mar 20, 2010 #3
    Well, in GSM you have a 200KHz channel in one of the GSM bands, assigned to a user/mobile.
    So if you are measuring at the mobile, then whatever enters the 200KHz channel contributes to RSSI - interference, jammer signals, the actual signal that you are supposed to receive, etc.
    When you measure RSSI at the Base Station, then you are measuring the whole band-range
    that a TRX (Transceiver) board in the BTS handles. This band-range can be Nx200KHz, N being the number of ARFCNs (Absolute RF Channel numbers) the TRX handles. Here again whatever enters the band of the TRX contributes to the RSSI. But a TRX also measures the RSSI in the individual 200KHz band as well (to power-control the mobile correctly).

    Long story short -high GSM RSSI does not necessarily mean high interference. If you have
    a misbehaving phone that is screaming at the BTS tower, you will still measure high RSSI. If you are a phone too close to the tower, you measure high RSSI!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook