Mobile communication system, base station device and relay device

Abstract

A mobile communication system capable of preventing interference in a communication system as well as reducing the load of a user equipment in a search operation. In the mobile communication system, radio communication is performed using a carrier having the same frequency in a direct link between a donor cell and a user equipment being served thereby and an access link between a relay node and a user equipment being served thereby. In a backhaul link between the donor cell and the relay node, radio communication is performed using a carrier having a different frequency from that of the carrier used in the direct link and the access link.

1 . (canceled) 
     
     
         2 . A mobile communication system comprising:
 a base station device;   a user equipment device configured to perform radio communication with said base station device; and   a relay device configured to relay the radio communication between said base station device and said user equipment device,   wherein said base station device transmits frequency information for said relay device to said relay device, and   said relay device receives said frequency information transmitted from said base station device.   
     
     
         3 . The mobile communication system according to  claim 2 , wherein, in a state where said base station device has an RRC connection with said relay device, said base station device transmits said frequency information for said relay device to said relay device, and said relay device receives said frequency information transmitted from said base station device. 
     
     
         4 . The mobile communication system according to  claim 2 , wherein, through a dedicated information notification between said base station device and said relay device, said base station device transmits said frequency information for said relay device to said relay device, and said relay device receives said frequency information transmitted from said base station device. 
     
     
         5 . The mobile communication system according to  claim 2 , wherein said frequency information is information related to a frequency band for said relay device. 
     
     
         6 . The mobile communication system according to  claim 2 , wherein said frequency information is frequency information used in an uplink. 
     
     
         7 . The mobile communication system according to  claim 2 , wherein
 said relay device transmits a relay device information indicating that it is a relay device to said base station device, and   said base station device receives said relay device information transmitted from said relay device.   
     
     
         8 . The mobile communication system according to  claim 7 , wherein, in a state where said base station device has an RRC connection with said relay device, said relay device transmits said relay device information indicating that it is a relay device to said base station device, and said base station device receives said relay device information transmitted from said relay device. 
     
     
         9 . The mobile communication system according to  claim 3 , wherein said RRC connection is established upon a request from said relay device. 
     
     
         10 . The mobile communication system according to  claim 8 , wherein said RRC connection is established upon a request from said relay device. 
     
     
         11 . A base station device that configured to perform radio communication with a user equipment device, wherein said base station device transmits frequency information for a relay device to said relay device, said relay device being configured to relay the radio communication between said user equipment device and said base station device. 
     
     
         12 . A relay device that configured to relay radio communication between a base station device and a user equipment device, wherein said relay device receives a frequency information for said relay device transmitted from said base station device.