公开(公告)号：US20170367146A1

公开(公告)日：2017-12-21

申请号：US15021933

申请日：2015-12-22

Applicant: SoftBank Corp.

Inventor： Hiroki RYOKE ,  Masahiko NANRI ,  Yuichi HAYASHI

IPC: H04W88/04 ,  H04W72/08 ,  H04W16/26

CPC classification number: H04W88/04 ,  H04W16/16 ,  H04W16/26 ,  H04W72/085 ,  H04W84/045

Abstract: A mobile communication system 1 for relaying packet communication between a macro cell base station 10 and a mobile unit 30 includes a femto cell base station 20 in which first radio communication is executed with the macro cell base station and second radio communication is executed with the mobile unit, wherein at least one of first frequency used for the first radio communication and second frequency used for the second radio communication is automatically selected so as to make the first frequency and the second frequency different from each other. It is possible to realize a mobile communication system capable of: preventing interference between a backhaul frequency and an access frequency when activating the mobile unit; preventing interference with the access frequency also when changing backhaul after establishing a connection or when receiving an instruction to change the access frequency; and preventing a loop phenomenon to select the access frequency, which is transmitted by the mobile unit itself, as the backhaul.