LTE-Advanced is one of major technology for 4G (IMT-Advanced) standards. LTE patent portfolios are researched among US market leaders. To find the key IPR holders for the LTE-Advanced patents, a keyword search of the USPTO patent data base has been performed.Total of 317 published patent applications are identified as of Feb. 28, 2011. Qualcomm is the leader followed by InterDigital, AT&T, Samsung, RIM, LG, and Motorola as of Feb. 28, 2011.
The distribution of LTE-Advanced patents among the key technologies in standard specifications is as follows:
Carrier Aggregation (17%), HetNet (12%), Relay (53%), SON (11%), and SU-MIMO (7%).
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