MOBILE COMMUNICATION SYSTEM, BASE STATION, CoMP CONTROL APPARATUS AND COMMUNICATION CONTROL METHOD

Abstract

In a mobile communication system in which a CoMP cooperating set and a user terminal perform communication therebetween, the CoMP cooperating set includes a main base station controlling CoMP communication with the user terminal, and the main base station comprises a receiver that receives user data addressed to the user terminal from a core network; a conversion unit that converts the user data received by the receiver to PDCP data unit to which a sequence number is added in a PDCP layer; and a transmission unit that transmits the PDCP data unit obtained by the conversion unit to another base station included in the CoMP cooperating set.

1 . A mobile communication system in which a CoMP cooperating set and a user terminal perform communication therebetween, wherein
 the CoMP cooperating set includes a main base station controlling CoMP communication with the user terminal, and   the main base station comprises
 a receiver that receives user data addressed to the user terminal from a core network; 
 a conversion unit that converts the user data received by the receiver to PDCP data unit to which a sequence number is added in a PDCP layer; and 
 a transmission unit that transmits the PDCP data unit obtained by the conversion unit to another base station included in the CoMP cooperating set. 
   
     
     
         2 . The mobile communication system according to  claim 1 , wherein
 when receiving the PDCP data, the other base station processes the PDCP data in a MAC layer without applying ARQ retransmission in a RLC layer.   
     
     
         3 . A mobile communication system in which a CoMP cooperating set and a user terminal perform communication therebetween, comprising:
 a CoMP control apparatus, wherein   the CoMP control apparatus comprises
 a receiver that receives user data addressed to the user terminal from a core network; 
 a conversion unit that converts the user data received by the receiver to PDCP data unit to which a sequence number is added in a PDCP layer; and 
 a transmission unit that transmits the PDCP data unit obtained by the conversion unit to each of base stations included in the CoMP cooperating set. 
   
     
     
         4 . The mobile communication system according to  claim 3 , wherein
 when receiving the PDCP data, each of the base stations included in the CoMP cooperating set processes the PDCP data unit in a MAC layer without applying ARQ retransmission in a RLC layer.   
     
     
         5 - 8 . (canceled) 
     
     
         9 . A mobile communication system in which a CoMP cooperating set performs downlink CoMP communication with a user terminal, wherein
 the CoMP cooperating set includes a main base station and at least a subordinate base station,   the subordinate base station comprises
 a transmission unit that performs HARQ data transmission to the user terminal; and 
 a notification unit that notifies the main base station of a failure of the HARQ data transmission when the HARQ data transmission fails, and 
   the main base station comprises
 a management unit that collectively manages ARQ retransmission data from the CoMP cooperating set to the user terminal; 
 a receiver that receives a notification of the failure of the HARQ data transmission from the subordinate base station; and 
 a transfer unit that transfers the ARQ retransmission data which is managed by the management unit to the subordinate base station in response to the notification received by the receiver. 
   
     
     
         10 . The mobile communication system according to  claim 9 , wherein the transmission unit transmits the ARQ retransmission data transferred from the main base station to the user terminal using HARQ. 
     
     
         11 . The mobile communication system according to  claim 9 , wherein the ARQ retransmission data is PDCP data unit. 
     
     
         12 - 14 . (canceled)