FIELD: information technology.
SUBSTANCE: communication between a mobile station (UE) and a radio base station (eNB) is carried out by using a certain key generated using a first key. The mobile communication method involves steps of: updating, at the mobile station (UE), the first key upon receiving a handover command signal from the radio base station (eNB); transmitting, from the mobile station (UE) to the radio base station (eNB), a handover complete signal by using the certain key generated using the updated first key; and performing, at the mobile station (UE), cell selection when failing to transmit the handover complete signal and detecting a radio link failure; and transmitting, from the mobile station to a selected re-establishment target cell, a re-establishment request signal by using the first key before being updated.
EFFECT: performing a radio communication re-establishment procedure when the target base station fails to receive a RRC connection re-establishment complete message.
4 cl, 12 dwg
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