Any freq » History » Version 6
fixeria, 01/17/2019 03:00 PM
| 1 | 3 | fixeria | Since [[OsmocomBB:]] does support [[OsmocomBB:SDR_PHY|SDR PHY]] now, the working frequency range is only limited by hardware capabilities. In other words, the "ARFCN -> frequency" calculation may be modified to add a constant frequency offset, so this will allow one to run both base stations and ([[OsmocomBB:]]-based) mobile stations on any frequency (e.g. in 2.4 GHz WiFi band)! |
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| 2 | 2 | fixeria | |
| 3 | 6 | fixeria | Of course, regular GSM phones are not able to "see" any networks outside the known predefined ranges (e.g. GSM-900, DCS-1800), so they wouldn't be able to camp to a network running on some shifted frequency. But we believe that this feature can be helpful for research and development. |
| 4 | 4 | fixeria | |
| 5 | 6 | fixeria | h2. Update from 17.01.2019 |
| 6 | |||
| 7 | The [[gr-gsm:]] based transceiver, grgsm_trx, now has _--freq-offset_ command line option, that allows to shift the baseband frequency. In order to shift the baseband frequency of the network side, [[OsmoTRX:]] needs to be hacked a bit. This feature isn't merged to the master so far, please check out https://git.osmocom.org/osmo-trx/log/?h=fixeria/freq_shift. |
