Communication system, master base station and secondary base station

Abstract

In a communication system according to the present invention, a UE and an MeNB perform both a direct communication and a communication through a SeNB. Along with moving of the UE, a handover process of switching the MeNB to which the UE is connected, from an S-MeNB to a T-MeNB is performed. The connection between the UE and the SeNB is maintained during the handover process. The UE starts transmitting data to the SeNB before a communication path between the UE and the MeNB is changed from a path formed by the S-MeNB and the UE to a path formed by the T-MeNB and the UE.

1 . A communication system comprising:
 a plurality of base stations that include a plurality of master base stations and at least one secondary base station; and   a user apparatus configured to wirelessly communicate with the plurality of the base stations, wherein   a master base station among the plurality of the master base stations notifies the secondary base station of configuration information related to uplink communication scheduling.   
     
     
         2 . The communication system according to  claim 1 , wherein
 the configuration information is notified from the master base station to the secondary base station by an addition request message related to addition of the secondary base station or a modification request message related to modification of the secondary base station.   
     
     
         3 . A master base station in a communication system comprising:
 a plurality of base stations that include a plurality of master base stations and at least one secondary base station; and   a user apparatus configured to wirelessly communicate with the plurality of the base stations, wherein   the master base station among the plurality of the master base stations notifies the secondary base station of configuration information related to uplink communication scheduling.   
     
     
         4 . A secondary base station in a communication system comprising:
 a plurality of base stations that include a plurality of master base stations and at least one secondary base station; and   a user apparatus configured to wirelessly communicate with the plurality of the base stations, wherein   the secondary base station receives, from a master base station among the plurality of the master base stations, configuration information related to uplink communication scheduling.