Abstract: A radio communication system is disclosed that includes at least one user equipment and multiple base stations including a first base station configured to execute radio resource control of the user equipment through a control path and a second base station configured not to execute radio resource control of the user equipment. The system includes multiple gateways, including a first gateway connected with the first base station and a second gateway connected with the second base station, and a switching station that controls the establishment of user paths among nodes.

Abstract: A radio communication system is disclosed that includes at least one user equipment and multiple base stations including a first base station configured to execute radio resource control of the user equipment through a control path and a second base station configured not to execute radio resource control of the user equipment. The system includes multiple gateways, including a first gateway connected with the first base station and a second gateway connected with the second base station, and a switching station that controls the establishment of user paths among nodes.

Abstract: A radio communication system includes at least one user equipment, a first base station, a second base station, a first gateway, a second gateway, and a switching station. The switching station decides whether or not a gateway through which communication executed by the user equipment should be routed is the second gateway. In a case in which it is decided that the gateway through which communication executed by the user equipment should be routed is the second gateway, the switching station executes control for establishing a first user path for uplink and a second user path that is a radio path. The second base station executes control for establishing a first user path for downlink.

Abstract: A radio communication system includes a user device, a first base station, a second base station, a switching center, and a gateway device. In a handover operation performed in a situation in which a user-plane path has been established through the first base station, the first base station transmits, to the user device, a radio connection reconfiguration message commanding that a radio bearer be established between the second base station and the user device and receives a radio connection reconfiguration complete message transmitted from the user device. The first base station transmits, to the switching center, a path switching request message requesting that the established user-plane path be changed so as to pass through the second base station.

Abstract: The radio communication system has a user equipment, a first base station, a second base station, a serving gateway, and a switching station. The first base station has a control-plane path set to the switching station. The second base station has no control-plane path to the switching station. A path setting determiner determines whether to set a user-plane path, based on measurement information reported from the user equipment. A base station determiner determines, based on identification information obtained by the user equipment, whether a base station to which the user-plane path is to be set is the second base station, the base station corresponding to the obtained identification information.

Abstract: A radio communication system has a user equipment, a first base station, a second base station, and a gateway device. The first base station is capable of executing radio resource control of the user equipment, whereas the second base station does not execute radio resource control of the user equipment. The first base station, based on a measurement report message, determines whether a user-plane path is to be established between the first base station and the second base station. In a case in which it is determined that a user-plane path is to be established, the first base station establishes a user-plane path between the first base station and the second base station. Also, the first base station controls the user equipment to establish a user-plane path between the user equipment and the second base station.

Abstract: A radio communication system includes at least one user equipment, a first base station, a second base station, a first gateway, a second gateway, and a switching station. The switching station decides whether or not a gateway through which communication executed by the user equipment should be routed is the second gateway. In a case in which it is decided that the gateway through which communication executed by the user equipment should be routed is the second gateway, the switching station executes control for establishing a first user path for uplink and a second user path that is a radio path. The second base station executes control for establishing a first user path for downlink.

Abstract: A radio communication system has a user equipment, a first base station, a second base station, and a gateway device. The first base station is capable of executing radio resource control of the user equipment, whereas the second base station does not execute radio resource control of the user equipment. The first base station, based on a measurement report message, determines whether a user-plane path is to be established between the first base station and the second base station. In a case in which it is determined that a user-plane path is to be established, the first base station establishes a user-plane path between the first base station and the second base station. Also, the first base station controls the user equipment to establish a user-plane path between the user equipment and the second base station.

Abstract: The radio communication system has a user equipment, a first base station, a second base station, a serving gateway, and a switching station. The first base station has a control-plane path set to the switching station. The second base station has no control-plane path to the switching station. A path setting determiner determines whether to set a user-plane path, based on measurement information reported from the user equipment. A base station determiner determines, based on identification information obtained by the user equipment, whether a base station to which the user-plane path is to be set is the second base station, the base station corresponding to the obtained identification information.

Abstract: A radio communication system includes a user device, a first base station, a second base station, a switching center, and a gateway device. In a handover operation performed in a situation in which a user-plane path has been established through the first base station, the first base station transmits, to the user device, a radio connection reconfiguration message commanding that a radio bearer be established between the second base station and the user device and receives a radio connection reconfiguration complete message transmitted from the user device. The first base station transmits, to the switching center, a path switching request message requesting that the established user-plane path be changed so as to pass through the second base station.

Abstract: A base station generates first setting information commonly used for establishing a logical path for communication with a user apparatus and for establishing a logical path for communication with a relay station, and second setting information used only for establishing the logical path for communication with the relay station, and transmits a second RRC message including the second setting information to the relay station after transmitting a first RRC message including the first setting information to the relay station. The first setting information includes information indicating a priority of a radio bearer in the logical path, information indicating usage of resources in SPS, information indicating resources of SRS, configuration information in a MAC sublayer, and information on change of a security encryption key in handover, and the second setting information includes at least system information and MBSFN information.

Abstract: A user apparatus includes a radio communication unit capable of operating in a continuous reception mode in which receiving operations to receive control signals are continuously executed and in a discontinuous reception mode in which the receiving operations are discontinuously executed and an application running unit capable of running multiple applications in parallel. A radio communication system includes a communication frequency characteristic acquiring unit that acquires, for each of the applications, a communication frequency characteristic related to communication that each of the applications run in the user apparatus executes and a bearer decision unit that decides, for each of the applications, a bearer to be used for the communication of each of the applications according to the communication frequency characteristic of each of the applications.

Abstract: A relay station includes a signal generation unit configured to generate a signal in the relay station and a receiving unit configured to receive a signal from a first communication station. The relay station further includes a signal generating node identifying unit configured to identify whether a signal to be transmitted to a second communication station is a received signal received from the first communication station or a generated signal generated by the signal generation unit. The relay station further includes a signal transmission unit configured to transmit both or one of the received signal and the generated signal associated with a radio bearer to the second communication station.

Abstract: A user equipment is capable of executing plural applications in parallel. The user equipment obtains, for each application, packet statistics information relating to packets that each of the plural applications transceives, for reporting to a base station. The base station, based on the packet statistics information received from the user equipment, calculates a state transition parameter for use in controlling the state transition of the user equipment and the base station. The base station executes state transition control based on the calculated state transition parameter.

Abstract: A relay station includes a reception section that receives a first radio frame sent from a base station, and a transmission section that sends a second radio frame that includes a downstream data signal included in the received first radio frame, to a mobile station located in a cell of the relay station. When it is determined that a first identifier of a handover-destination cell, included in a first radio frame, matches a second identifier of the cell of the relay station, included in the second radio frame, and that the transmission timing of the first identifier matches the transmission timing of the second identifier, a time shift section of the relay station shifts the transmission timing of the second radio frame sent from the transmission section so as to make the transmission timing of the first identifier different from the transmission timing of the second identifier.

Abstract: A relay node of a communication system includes a communication unit that initiates a session by executing an initial connection procedure for retrieving a cell list indicating one or more donor base station candidates from a maintenance node after establishment of an initial communication link among the relay node, a base station, and a switching center, and for establishing a communication link to a donor base station in the cell list and a switching center connected to the donor base station; a storing unit that stores the cell list; and a reconnection control unit that selects, when a radio link with the donor base station is lost, a donor base station satisfying a predetermined criterion in the cell list, and that causes the communication unit to establish a communication link to the selected donor base station and a switching center connected to the selected donor base station.

Abstract: A relay station for relaying a radio signal between a mobile station and a base station includes a relay station information generating unit configured to generate relay station information used by the base station to select a switching center to be connected to the relay station. The relay station also includes a message generating unit configured to generate a message including the relay station information generated by the relay station information generating unit, and a transmitting unit configured to transmit the message generated by the message generating unit to the base station.

Abstract: A coordinated transmission method of the invention has the steps of selecting a directional pattern corresponding to an area in which a radio terminal locates, from among a plurality of directional patterns determined respectively corresponding to a plurality of resources in frequency domains where the plurality of directional patterns is configured so that a plurality of radio base stations surrounding the area transmits, to the area, directional beams of same frequency domain resources to face one another, while not transmitting the directional beams of the same frequency domain resources using the same frequency domain resources to areas adjacent to the area, and of distributing a signal to transmit to the radio terminal according to the selected directional pattern, determining a frequency domain and directions of directional beams regarding the distributed signal, and delivering the signal to each of the plurality of radio base stations that simultaneously transmits the signal to the radio terminal.

Abstract: A first base station forms a first cell and communicates by radio with a user apparatus in a first frequency band. A second base station forms a second cell and communicates by radio with the user apparatus in a second frequency band different from the first frequency band. A gateway apparatus serves as a connection point with an external network. Logical paths used for the user apparatus are established respectively through the first base station and the second base station. A communication control section controls the logical paths and radio communication. The user apparatus sends and receives a user signal to and from the external network by using both a first logical path and a second logical path at the same time.

Abstract: A relay station includes a reception section that receives a first radio frame sent from a base station, and a transmission section that sends a second radio frame that includes a downstream data signal included in the received first radio frame, to a mobile station located in a cell of the relay station. When it is determined that a first identifier of a handover-destination cell, included in a first radio frame, matches a second identifier of the cell of the relay station, included in the second radio frame, and that the transmission timing of the first identifier matches the transmission timing of the second identifier, a time shift section of the relay station shifts the transmission timing of the second radio frame sent from the transmission section so as to make the transmission timing of the first identifier different from the transmission timing of the second identifier.