Patent ID: 8848663

Claim:
A handover method, comprising: a step of connecting a first relay node and a second relay node via a radio bearer and connecting the second relay node and a radio base station via a radio bearer; a step of switching a mobile station from a first state where the radio bearer is set with the first relay node in order to communicate via the first relay node, the second relay node, and the radio base station to a second state where the radio bearer is set with the radio base station in order to communicate via the radio base station; a step in which the first relay node transmits a first handover request signal to the second relay node; a step in which upon receiving the first handover request signal, the second relay node transmits a second handover request signal to the radio base station; a step in which upon receiving the second handover request signal, the radio base station transmits a first handover request confirmation signal to the second relay node; a step in which upon receiving the first handover request confirmation signal, the second relay node transmits a second handover request confirmation signal to the first relay node; and a step in which upon receiving the second handover request confirmation signal, the first relay node transmits a handover instruction signal to instruct to hand over to the radio base station, to the mobile station.