Fabrice Bellard (of qemu, ffmpeg, and other projects) wrote a software based LTE base station. https://bellard.org/lte/ https://bellard.org/lte/ Not quite wha

Fabrice Bellard (of qemu, ffmpeg, and other projects) wrote a software based LTE base station. https://bellard.org/lte/ https://bellard.org/lte/ Not quite what you're asking for, but makes it possible to tap/trace the other end which might help depending on your goals.