Abstract: A method of deregistering a relay station and a multi-hop relay system for the method are provided. In order to deregister the relay station, a base station ends a handover of mobile stations connected to the relay station, and informs the relay station accordingly. When the handover of the mobile stations is ended, the relay station performs a deregistration procedure. Messages that already exist are used as messages necessary for the method.

Abstract: Provided are a handover method using a relay station having a handover control function and a multi-hop relay system. When handover of mobile stations connected to a relay station is required, the relay station negotiates handover of the mobile stations with a base station by exchanging a handover request message and a handover response message. Upon execution of handover of the mobile stations, the relay station collects handover results of the mobile stations and transmits the handover results to the base station. The base station then updates information about the handed-over mobile stations.