Repeater, communication system, base station, radio terminal, and management server

In a communication system including one or more base stations, one or more repeaters, and one or more mobile stations, a mobile station comprising:

• a communication unit operable to perform communication;
• a detection unit operable to detect an error in the communication;
• a storage unit storing therein a neighbor list indicating information of one or more repeaters and one or more base stations as candidates for a handover target of the mobile station;
• and
• a handover performing unit operable to perform a handover to a target repeater selected from the repeaters whose information is indicated by the neighbor list in a case where an error rate of errors detected by the detection unit is greater than a predetermined threshold value.

A communication system including one or more base stations, one or more repeaters, and one or more mobile stations, in which relative positional relations between the repeaters and the base stations are changeable, wherein

• a base station comprises:
• a first storage unit storing therein a neighbor list indicating information of one or more base stations and one or more repeaters as candidates for a handover target of each repeater and each mobile station that are in communication with the base station;
• an update unit operable to update, in a case where the base station has achieved synchronization with a new repeater whose information is not indicated by the neighbor list, the neighbor list by adding the information of the new repeater;
• and
• a first transmission unit operable to transmit the neighbor list stored in the first storage unit to each repeater and each mobile station that are in communication with the base station,
• a repeater comprises:
• a second storage unit storing therein a neighbor list indicating information of one or more base stations and one or more repeaters as candidates for a handover target of each mobile station with which the repeater is in communication;
• an acquisition unit operable to acquire, in a case where the repeater has cancelled synchronization previously achieved and achieved synchronization with a new base station, a new neighbor list from the new base station;
• a replacement unit operable to replace the neighbor list stored in the second storage unit with the new neighbor list and adds information of the new base station to the new neighbor list;
• and
• a second transmission unit operable to transmit the neighbor list stored in the second storage unit to each mobile station with which the repeater is in communication.

In a communication system including one or more base stations, one or more repeaters, and one or more mobile stations, a base station comprising:

• a storage unit storing therein a neighbor list indicating information of one or more base stations and one or more repeaters as candidates for a handover target of each repeater and each mobile station that are in communication with the base station;
• an update unit operable to update, in a case where the base station has achieved synchronization with a new repeater whose information is not indicated by the neighbor list, the neighbor list by adding the information of the new repeater;
• and
• a transmission unit operable to transmit the neighbor list stored in the storage unit to each repeater and each mobile station that are in communication with the base station.

In a communication system including a management server, one or more base stations, one or more repeaters, and one or more mobile stations, the management server being used for managing broadcast destinations of contents in the communication system,

• each base station (i) receiving a content broadcast from the management server and (ii) transmitting the received content to a repeater managed by the base station and, in a case where the received content is addressed to the base station, to a mobile station managed by the base station, and
• the repeater transmitting the received content to a mobile station managed by the repeater in a case where the received content is addressed to the repeater, wherein
• the management server comprises:
• a storage unit storing therein a broadcast list referred to by the management server when broadcasting any content, the broadcast list indicating zones each in association with one or more base stations and one or more repeaters belonging to the zone, each zone being determined as a broadcast destination of one of the contents.