FIELD: radio engineering, communication.
SUBSTANCE: radio base station eNB #1 according to the present invention includes a transmission unit configured to notify a mobile station UE that the length of the PDCP-SN used in communication within the cell #11 (or the cell #1) is changed in a case where the mobile station UE performs a handover from the cell #1 to the cell #11 (or in a case where the mobile station UE performs a handover from the cell #11 to the cell #1).
EFFECT: reducing handover delay while avoiding an increase in load on the control plane even in a case where the type of the PDCP-SN used within a cell after the handover is changed.
4 cl, 9 dwg
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