If Huawei agreed an payment plan with Ericson
then the IP troll bought something like a sitting tenant, existing agreements should have been part of the purchase details and the troll knew this before purchase.
Unless they can show that Huaweu reneged on the original agreement then how did they get to go to court?
I don't like Huawei but this seems a bit unfair to attempt to charge them for not paying for use of the patents when clearly they did