LTE patent portfolios are researched for global market leaders in mobile infrastructure manufactures: Alcatel-Lucent, Ericsson, Huawei, and NSN. US designating essential patent candidates at the ETSI IPR Online website are analyzed. Among the four major competitors for the US LTE infrastructure market, only the Ercisson has a meaningful number of essential patent candidates for the analysis (e.g. most of Huawei's 147 LTE essential patent candidates are in China’s national stage).
Ericsson declared 24 essential patents (total of 30 candidates in TS36 specifications) out of 49 total patents (e.g. including PCT applications) for the US market as of Aug. 31 2009.
The most declared specification for the Ericsson's LTE essential patent candidates was TS36.323 (PDCP protocol specification) followed by TS36.322 (RLC protocol specification), and TS36.331 (RRC protocol specification).
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