Adaptix sued Apple for patent infringement of Apple’s next version of its tablet, iPAD3 based on its patents US6947748 and US7454212. The lawsuit was about LTE technology adopted in iPAD3.
Adaptix’s patents US6947748 and US7454212 relate to channel evaluation method and adaptive modulation/coding scheme in OFDMA system utilizing reference signals (because Adaptix’s patents were aimed at WiMAX (802.11e) standards originally, they used the term pilot signals instead of reference signals).
Even though the channel evaluation method and adaptive modulation/coding scheme in OFDMA system utilizing reference signals are described in LTE standard specifications (TS36.211, 212, 213, 300, and 321), preliminary comparative research between claims in the patents and specifications shows that Adaptix’s patents US6947748 and US7454212 may not be essential for the implementation of iPAD3.
Further more, TechIPm’s intensive research of LTE patents essential for LTE devices implementation (LTE Essential Patent Candidates 3Q 2011: http://techipm-innovationfrontline.blogspot.com/2011/07/lte-essential-patent-candidates-2011-3q.html), indicates that Qualcomm’s LTE chipsets, which are used in of iPAD3, may be protected by Qualcomm’s LTE patent portfolio.
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