By refusing to negotiate and pursuing a litigation strategy on the FRAND patents, Apple is leaving themselves open to a far more damaging counter offensive. On the core telecom patents that define the 3G and 4G (LTE) wireless network standards, Samsung is a middle weight contributor of IP. The heavyweights of the LTE IP are LG, Qualcomm, Intel (via InterDigital), Motorola (Google) and Nokia. Additional core telecom IP portfolios are held by Ericsson, RIM, Huawei Corp and HTC.
Qualcomm, Ericsson, RIM, Intel, Huawei and Nokia are unlikely to join any IP counter offensive against Apple because they don't sell smartphone handsets, license technology to both sides or benefit from suppressing Android (Nokia/RIM). But LG, Motorola (Google) and HTC have a vested interest in defending Android and between them have substantial IP portfolios. It's important to note that these companies can not refuse to license their Standard Essential Patents, however Apple has so far refused to negotiate and has pursued a litigation strategy. Apple is not totally without ammunition in the telcomm patents; they were part of the coalition that purchased Nortel's IP, but most of the Nortel portfolio was already cross licensed to other standards contributors so are more useful for defensive purposes. Cross license agreements do not however protect Apple from having to negotiate FRAND license fees with the appropriate patent holders. If they refuse to negotiate, injunctions are in the future.