Whereabout the fourth generation mobile technology
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Timing:
2001: Standardized technologies related to 3.5 G (downward over 8Mbps in 5MHz bandwidth), such as HSDPA( High Speed Downlink PacketAccess) and VoIP (Voice over IP) service
WP8F(Working Party 8F)of ITU(International Telecommunications Union)started discussion about the possible feature, standardized technology of the 4G
2005: The communication speed will become over 30Mbps
2010: Forth generation service starts with bandwidth 50-100Mbps
2015: Necessary to build 1.2 GHz-1.7 GHz frequency for accomodating the increased communication
Resources:
-Shuuji Urabe/ Yoshisuke Hasegawa/ Masao Miyazaki, "Mobile Communication System Evolution in Digital Mobile Radio", Sharp engineering report, Sharp corporation, December 2001
- NTT DoCoMo homepage (Investors Relations) http://www.nttdocomo.co.jp/english/corporate/investor_relations/top_e.html