Re: Fair trading
I'm not sure about the patent jurisdiction that the patents were filed in, but Huawei/Hisilicon (a Huawei subsidiary) appear to have around 50% of the 5G patents filed as of 2018:
https://files.lbr.cloud/254270/conversions/figure_4_4-full.jpg
I suspect some of those patents will be handset/fab related, but that is a significant head start on costs assuming FRAND. My (incorrect) asusmption would have been many of the 5G patents would have been held by existing 2G/3G/4G holders.
Huawei are suggesting they will sell their patents to a western company to address some of the issues holding back 5G.