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