About SAKAGUCHI TAKUJI
About NTT DoCoMo
About KOYAMA DAISUKE
About NTT DoCoMo
About NAKAMICHI RYOSUKE
About NTT DoCoMo
About IMAMURA SUSUMU
About NTT DoCoMo
About NTT DOCOMOテクニカル・ジャーナル
About packet switching
About FOMA
About Mobile communication
About Telephone,data communication and exchange in general
About FOMA
About コアネットワーク
About 回線
About パケット交換