To eval　　　　uate the quality of Nortel's LTE IPR for OFDM/MIMO standards, patent disclosures for each essential patent candidate are compared to the technical specifications for LTE OFDM/MIMO standards (TS36.211 V8.70). Total of 28 patents issued and published in the United States before Aug. 1 2009 in the lists of patents declared essential to LTE appear at the ETSI IPR Onl　　　　ine are used in the analysis.

As for the most described field of technical specification, Down Link OFDM/MIMO (Section 6.3) was the top in Nortel's OFDM/MIMO essential patent candidates.

As a measure for the essentiality of the candidates, Essentiality Index (EI) is eval　　　　uated:

EI : Criteria
E0 : Patent disclosure is nothing to do with LTE technical specifications
E1 : Patent disclosure is weakley related to LTE technical specifications
E2 : Patent disclosure is partially related to LTE technical specifications, but required further analysis
E3 : Patent disclosure is partially related to LTE technical specifications
E4 : Patent disclosure is related to LTE technical specifications overall
E5 : Patent disclosure is strongly related to LTE technical specifications

More than half of the Nortel's OFDM/MIMO essential patent candidates are classified as E2.

Only 30 % (seven E3 and one　　　　 E4) of the Nortel's OFDM/MIMO essential patent candidates are classified as high value of EI for the essentiality.


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