Rssibin » History » Version 14
fixeria, 01/21/2019 02:41 AM
1 | 13 | fixeria | h1. RSSI application (firmware) |
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2 | 1 | laforge | |
3 | 13 | fixeria | {{>toc}} |
4 | 11 | laforge | |
5 | This [[OsmocomBB]] firmware build is able to measure received signal strength over all channels that the hardware supports. |
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6 | |||
7 | 13 | fixeria | It has two modes: ARFCN view and Spectrum view. |
8 | 1 | laforge | |
9 | 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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10 | 13 | fixeria | Uplink measurements always require the [[HardwareFilterReplacement]]. |
11 | 11 | laforge | |
12 | 1 | laforge | h2. Loading procedure |
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14 | 14 | fixeria | 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: |
15 | 1 | laforge | |
16 | 11 | laforge | <pre> |
17 | 13 | fixeria | $ cd osmocom-bb/src/ |
18 | $ host/osmocon/osmocon -p /dev/ttyUSB0 -m c123xor -c target/firmware/board/compal_e88/rssi.highram.bin |
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19 | 1 | laforge | </pre> |
20 | 11 | laforge | |
21 | h2. ARFCN view |
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22 | |||
23 | 12 | zecke | {{thumbnail(osmocombb-rssi-arfcn.jpg)}} {{thumbnail(osmocombb-rssi-arfcn-color.jpg)}} |
24 | 1 | laforge | |
25 | In the ARFCN view you get |
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26 | 11 | laforge | * an indication of the ARFCN currently selected |
27 | * an indication of the band (DCS/PCS) for ARFCNs that exist in both bands |
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28 | * the Rx Level in dBm |
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29 | * a bar graph vor visualizing the RSSI |
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30 | * an optional audible indication (beep tones) corellated with the RSSI |
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31 | 1 | laforge | |
32 | You can use it the following way: |
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33 | 11 | laforge | * Enter the digits of an ARFCN on the numeric keypad followed by the Enter soft-key |
34 | * Use the Left/Right buttons to decrease/ increase the currently shown ARFCN |
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35 | * Hold the Left/Right buttons to faster decrease / increase ARFCN |
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36 | * Use the Up/Down buttons to increase/decrease the beep tone volume |
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37 | * Use the * (asterisk) button to enter or leave spectrum view |
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38 | * Use the UL/DL soft-button to change uplink / downlink measurement |
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39 | * Use Menu (middle) button to toggle maxium hold |
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40 | * Press green button to sync to selected cell |
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41 | 2 | laforge | |
42 | 6 | laforge | |
43 | 11 | laforge | h2. Spectrum view |
44 | |||
45 | |||
46 | 12 | zecke | {{thumbnail(osmocombb-rssi-spectrum.jpg)}} {{thumbnail(osmocombb-rssi-spectrum-color.jpg)}} |
47 | 10 | laforge | |
48 | In the spectrum view, you get a graphical spectrum plot |
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49 | 4 | jolly | |
50 | You can use it the following way: |
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51 | 11 | laforge | * Use the Up/Down buttons to adjust the scale |
52 | * Use the Left/Right buttons to decrease/ increase the currently shown ARFCN |
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53 | 7 | laforge | |
54 | 4 | jolly | |
55 | 11 | laforge | h2. Sync view |
56 | |||
57 | |||
58 | 12 | zecke | {{thumbnail(osmocombb-rssi-sync-color.jpg)}} |
59 | 10 | laforge | |
60 | 4 | jolly | In the Sync view you will received system information messages. Some of them are displayed, like network and cell ID. |
61 | 8 | laforge | |
62 | You can use it the following way: |
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63 | 11 | laforge | * Use the Down button to view ARFCNs of serving and neighbour cells |
64 | * Use the Up button to view received levels of each timeslot |
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65 | * Use the Left/Right buttons to select ARFCN of serving cell to be monitored |
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66 | * Press green button to request channel, to measure distance and delay |
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67 | 1 | laforge | |
68 | 12 | zecke | {{thumbnail(osmocombb-rssi-sync-distance-color.jpg)}} |