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Rssibin » History » Version 14

fixeria, 01/21/2019 02:41 AM

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h1. RSSI application (firmware)
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{{>toc}}
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This [[OsmocomBB]] firmware build is able to measure received signal strength over all channels that the hardware supports.
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It has two modes: ARFCN view and Spectrum view.
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Depending on your hardware capabilities, this firmware is able to take measurements in all four bands in both uplink and downlink.
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Uplink measurements always require the [[HardwareFilterReplacement]].
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h2. Loading procedure
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RSSI is too big to be loaded directly, so it have to be chainloaded (using "-c" option), i.e. [[Osmocon]] first will load little [[Loaderbin]] binary, which in its turn will load actual payload (big RSSI binary). The example chainloading command for a C123 phone:
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<pre>
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$ cd osmocom-bb/src/
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$ host/osmocon/osmocon -p /dev/ttyUSB0 -m c123xor -c target/firmware/board/compal_e88/rssi.highram.bin
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</pre>
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h2. ARFCN view
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{{thumbnail(osmocombb-rssi-arfcn.jpg)}} {{thumbnail(osmocombb-rssi-arfcn-color.jpg)}}
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In the ARFCN view you get
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* an indication of the ARFCN currently selected
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* an indication of the band (DCS/PCS) for ARFCNs that exist in both bands
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* the Rx Level in dBm
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* a bar graph vor visualizing the RSSI
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* an optional audible indication (beep tones) corellated with the RSSI
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You can use it the following way:
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* Enter the digits of an ARFCN on the numeric keypad followed by the Enter soft-key
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* Use the Left/Right buttons to decrease/ increase the currently shown ARFCN
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* Hold the Left/Right buttons to faster decrease / increase ARFCN 
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* Use the Up/Down buttons to increase/decrease the beep tone volume
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* Use the * (asterisk) button to enter or leave spectrum view
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* Use the UL/DL soft-button to change uplink / downlink measurement
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* Use Menu (middle) button to toggle maxium hold
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* Press green button to sync to selected cell
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h2. Spectrum view
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{{thumbnail(osmocombb-rssi-spectrum.jpg)}} {{thumbnail(osmocombb-rssi-spectrum-color.jpg)}}
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In the spectrum view, you get a graphical spectrum plot
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You can use it the following way:
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* Use the Up/Down buttons to adjust the scale
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* Use the Left/Right buttons to decrease/ increase the currently shown ARFCN
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h2. Sync view
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{{thumbnail(osmocombb-rssi-sync-color.jpg)}}
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In the Sync view you will received system information messages. Some of them are displayed, like network and cell ID.
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You can use it the following way:
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* Use the Down button to view ARFCNs of serving and neighbour cells
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* Use the Up button to view received levels of each timeslot
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* Use the Left/Right buttons to select ARFCN of serving cell to be monitored
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* Press green button to request channel, to measure distance and delay
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{{thumbnail(osmocombb-rssi-sync-distance-color.jpg)}}
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