FIELD: radio engineering, communication.
SUBSTANCE: when a belonging destination of a relay station (RN 2) is changed from a first base station (DeNB 1-1) to a second base station (DeNB 1-2), a relay-station mobility management unit (RN MME 7) changes a path of the relay-station data bearer, which is terminated by the relay station (RN 2) and a second data transfer unit (RN S/P-GW 8), so as to pass through the second base station (DeNB 1-2). The second data transfer unit (RN S/P-GW 8) terminates the relay-station data bearer provided between the relay station (RN 2) and the second data transfer unit (RN S/P-GW 8), and transfers user data between the first data transfer unit (UE S/P-GW 6) and the relay station (RN 2) by associating the mobile-station data bearer provided between the mobile station (RN-UE 3) and the first data transfer unit (UE S/P-GW 6) with the relay-station data bearer.
EFFECT: changing a base station without interrupting communication of a mobile station during operation of a relay node cell.
29 cl, 24 dwg
