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ptrkrysik / gr-gsm

Gnuradio blocks and tools for receiving GSM transmissions
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Only seeing one Mobile Network Code (MNC) within area #482

Closed braymond1776 closed 5 years ago

braymond1776 commented 5 years ago

Good evening, I was wondering if anyone had any thoughts as to why I might be only seeing a single MNC (260: T-Mobile) within my area. I'm not located in a major city, but I would think I should at least also be able to pickup AT&T cells as well.

Area: https://opencellid.org/#zoom=14&lat=43.45092&lon=-71.58555

SDR Hardware: Hackrf

Commands Used:

Frequency Table: https://en.wikipedia.org/wiki/GSM_frequency_bands

I'm assuming that I'm probably missing something due to the learning curve, but since my "Googling" isn't returning much luck, I thought I'd ask.

velichkov commented 5 years ago

Hi @gooroo363

I was wondering if anyone had any thoughts as to why I might be only seeing a single MNC (260: T-Mobile) within my area. I'm not located in a major city, but I would think I should at least also be able to pickup AT&T cells as well.

AT&T stopped their GSM 2G network back in 2017. See https://about.att.com/innovationblog/2g_sunset

braymond1776 commented 5 years ago

Thanks @velichkov, I was thinking that something like that might have been the case. So our options are to use gr-gsm for the 2G networks and something like OpenLTE for the 3G and 4G LTE networks?

velichkov commented 5 years ago

So our options are to use gr-gsm for the 2G networks and something like OpenLTE for the 3G and 4G LTE networks?

Yes, gr-gsm supports only GSM 2G. For LTE 4G you could use gr-lte, srsLTE, OpenAirInterface or OpenLTE. The only 3G UMTS open source project that I'm aware of is OpenBTS-UMTS.

Please post your further questions to our mailing list.

braymond1776 commented 5 years ago

Awsome thanks!