Ericsson's case (
PDF here) is basically that they've offered Apple the same FRAND rates as everyone else:
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Apple's case (sorry, I don't have any free links) is basically that they don't the the rate basis is fair:
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Summary: As with many/most ETSI cellular patents for the past two decades, Ericsson's royalty is based off the price of the device. (Which, btw, Apple usually claims is the $250 they pay Foxconn for a boxed unit ready to sell, not the $650+ they charge customers.)
The idea behind this method is partly that it encouraged manufacturers to also sell affordable devices, which are the primary reason we have the current worldwide infrastructure and why Apple has a market to make billions off now. In short, more expensive devices subsidizes the cheaper models. (A phone that sells for $20 cannot pay $30 in royalties.)
Over 100 licensees currently pay this royalty, giving weight as to its legitimacy. Moreover, this method was approved by the US DOJ long ago, and repeated many times in front of Congress since then.
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So Apple cannot claim that they're not getting the same deal as others. What they really mean is, they don't like the deal, and are hoping to change it.
Apple's desire is to base the royalty off the least saleable part. As they themselves noted above, this is a rather recent legal concept. In many ways this lower royalty base makes sense, and is now in favor in many legal and technical circles.
In other ways it does not, especially whenever someone claims it should be based off the chip price itself. Chips get cheaper all the time, while good IP value stays fairly constant.
It also doesn't fit Apple's own arguments used against Samsung, where Apple wanted a disproportionate royalty for things like swipe-to-unlock. But that's hypocrticial lawsuits for you.
It'll be interesting to see if a long-standing royalty method can survive today's legal climate.