I've had fleeting interests in this area for a while now, but for a number of reasons have never managed to do much in it. The standards are all open right, fo

I've had fleeting interests in this area for a while now, but for a number of reasons have never managed to do much in it. The standards are all open right, for modern mobile networks. Every time I see this topic come up there seems to be something about patents and entrenched oligopolies (i.e with Qualcomm). Is there any legal or IP issues raised from making open source modems for LTE/4G/5G/whatever networks.