ETRI of Korea has started 4th Generation Mobile Communication Research in 2002. New Service Definitions and Service vision was studied. The Soft Network for IP radio access network was developed. OFDMA technology was considered as a base technology of wireless transmission technology. High Speed Portable Internet (HPI) based on TDD technology will care about broadband wireless access and High Speed Mobile Multimedia (HMM) based on FDD technology will be a candidate of the 4G mobile communications.
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