wiki:rssi.bin

rssi.bin

This OsmocomBB firmware build is able to measure received signal strength over all channels that the hardware supports.

It has two modes: ARFCN view and Spectrum view

Depending on your hardware capabilities, this firmware is able to take measurements in all four bands in both uplink and downlink.

Uplink measurements always require the Hardware/FilterReplacement

Loading procedure

RSSI is too big to be loaded directly so it have to be chainloaded e. g. osmocom first will load little chainloader binary which in turn will load actual payload (big RSSI binary) specified via "-c" option.

The example chainloading command for C123 phone:

./osmocom-bb/src/host/osmocon/osmocon -p /dev/ttyUSB0 -m c123xor -c ./osmocom-bb/src/target/firmware/board/compal_e88/rssi.highram.bin ./osmocom-bb/src/target/firmware/board/compal_e88/chainload.compalram.bin

ARFCN view

ARFCN view ARFCN view on c140

In the ARFCN view you get

  • an indication of the ARFCN currently selected
  • an indication of the band (DCS/PCS) for ARFCNs that exist in both bands
  • the Rx Level in dBm
  • a bar graph vor visualizing the RSSI
  • an optional audible indication (beep tones) corellated with the RSSI

You can use it the following way:

  • Enter the digits of an ARFCN on the numeric keypad followed by the Enter soft-key
  • Use the Left/Right buttons to decrease/ increase the currently shown ARFCN
  • Hold the Left/Right buttons to faster decrease / increase ARFCN
  • Use the Up/Down buttons to increase/decrease the beep tone volume
  • Use the * (asterisk) button to enter or leave spectrum view
  • Use the UL/DL soft-button to change uplink / downlink measurement
  • Use Menu (middle) button to toggle maxium hold
  • Press green button to sync to selected cell

Spectrum view

Spectrum view Spectrum view on c140

In the spectrum view, you get a graphical spectrum plot

You can use it the following way:

  • Use the Up/Down buttons to adjust the scale
  • Use the Left/Right buttons to decrease/ increase the currently shown ARFCN

Sync view

Sync view

In the Sync view you will received system information messages. Some of them are displayed, like network and cell ID.

You can use it the following way:

  • Use the Down button to view ARFCNs of serving and neighbour cells
  • Use the Up button to view received levels of each timeslot
  • Use the Left/Right buttons to select ARFCN of serving cell to be monitored
  • Press green button to request channel, to measure distance and delay

Requested channel distance and delay

Last modified 3 years ago Last modified on Apr 22, 2013, 9:31:26 AM

Attachments (6)

Download all attachments as: .zip