Abstract: A mobile communication system includes a base station and a mobility management device and controls a connection between a mobile terminal and a plurality of networks. The mobility management device is connected to the base station and manages mobility of the mobile terminal in a cell of the base station. The mobility management device acquires, from the mobile terminal, network identification information that identifies a first network when the mobile terminal connects to the base station. The base station receives, from the mobile terminal, quality information that indicates communication quality between a base station of the first network identified by the network identification information and the mobile terminal. The mobility management device instructs the mobile terminal, based on the quality information, to connect to the first network identified by the network identification information.

Abstract: A relay node which is registered to a first radio base station and a first mobility management device and which relays a communication between a mobile station and the first radio base station. The relay node includes a first control unit configured to execute a handover process for the relay node and decide to hand over the mobile station from the first radio base station to a second radio base station when a degradation of radio quality between the relay node and the first radio base station is detected, and to transmit a handover control signal for the mobile station to the second radio base station or the first mobility management device.

Abstract: In a wireless communication system, a mobile station performs communication by means of first and second wireless communication schemes, and a base station communicates with the mobile station. The base station estimates communication loads of the first and second wireless communication schemes on the basis of a number of times communication is performed by an automatic call from the mobile station and a maximum number of times communication is able to be performed by the automatic call. The base station notifies the mobile station of one of the first and second wireless communication schemes having the low communication load estimated, and the mobile station uses the one of the first and second wireless communication schemes notified by the base station in a standby state caused by the automatic call.

Abstract: A radio communication system including: a radio terminal, a first radio base station configured to establish a first connection with the radio terminal, and to store connection information of the first connection to a memory when the radio terminal transits to a dormant state, and the second radio base station configured to obtain the connection information from the first radio base station when the radio terminal returns from the dormant state under the second radio base station, and to establish a second connection with the radio terminal based on the connection information.

Abstract: A relay node which is registered to a first radio base station and a first mobility management device and which relays a communication between a mobile station and the first radio base station. The relay node includes a first control unit configured to execute a handover process for the relay node and decide to hand over the mobile station from the first radio base station to a second radio base station when a degradation of radio quality between the relay node and the first radio base station is detected, and to transmit a handover control signal for the mobile station to the second radio base station or the first mobility management device.

Abstract: In a wireless communication system including a wireless terminal, a plurality of wireless base stations that wirelessly communicate with the wireless terminal, and a controller that changes the path used for communication with the wireless terminal from a first path via a first wireless base station to a second path via a second wireless base station, the controller monitors the amount of remaining data to the wireless terminal at the first wireless base station, controls to the timing to change to the second path according to the monitor result.

Abstract: A radio communications system includes a mobile station, a third generation base station that communicates with the mobile station using a 3G system, and a long time evolution (LTE) base station that communicates with the mobile station using an LTE system. The mobile station includes a communication controller and a 3G communication module. The communication controller determines feasibility of communication with the LTE base station using the LTE system. The 3G communication module notifies the 3G base station that the communication with the LTE base station is not feasible at the time of transmitting a communication request to the 3G base station when the communication controller determines that the communication is not feasible. The 3G base station communicates with the mobile station using the 3G system in response to the communication request without requesting the mobile station to communicate with the LTE base station.

Abstract: In a wireless communication system, a mobile station performs communication by means of first and second wireless communication schemes, and a base station communicates with the mobile station. The base station estimates communication loads of the first and second wireless communication schemes on the basis of a number of times communication is performed by an automatic call from the mobile station and a maximum number of times communication is able to be performed by the automatic call. The base station notifies the mobile station of one of the first and second wireless communication schemes having the low communication load estimated, and the mobile station uses the one of the first and second wireless communication schemes notified by the base station in a standby state caused by the automatic call.

Abstract: An interface establishing method in a handover procedure, includes: managing an occurrence status of handover for a plurality of radio node apparatuses; transmitting an establishment instruction from the management apparatus to a first radio node apparatus to establish a first link between the first radio node apparatus and a second radio node apparatus according to the occurrence status of handover, the first radio node apparatus and the second radio node apparatus being accommodated in the management apparatus; and establishing the first link between the first radio node apparatus and the second radio node apparatus based on the establishment instruction.

Abstract: A base station includes a transmission and reception section configured to receive a position registration request transmitted from a mobile station, and receive load information indicating a load of processing in each of a plurality of higher-level stations, transmitted from each of the plurality of higher-level stations which are connected to the base station, and a control section configured to select a higher-level station to be notified of the position registration request based on the load information, the position registration request being notified to the selected higher-level station by the transmission and reception section.

Abstract: The present invention provides a communication device capable of providing a highly reliable service by detecting communication abnormality at a high speed. The communication device comprises a link configuring unit configuring a plurality of logical links between a opposite communication device, a segmenting unit segmenting transmission data as being associated with each of the plurality of logical links, a transmission unit transmitting the segmented data via the logical link associated with this segmented data, a receiving unit receiving the data via each of the plurality of logical links, and an abnormality detection unit judging, within a predetermined period of time since the data were received via any one of the plurality of logical links, if the data are not received via at least one of the remaining logical links, at least one logical link to be an abnormal logical link.

Abstract: An interface establishing method in a handover procedure, includes: managing an occurrence status of handover for a plurality of radio node apparatuses; transmitting an establishment instruction from the management apparatus to a first radio node apparatus to establish a first link between the first radio node apparatus and a second radio node apparatus according to the occurrence status of handover, the first radio node apparatus and the second radio node apparatus being accommodated in the management apparatus; and establishing the first link between the first radio node apparatus and the second radio node apparatus based on the establishment instruction.

Abstract: In a wireless communication system including a wireless terminal, a plurality of wireless base stations that wirelessly communicate with the wireless terminal, and a controller that changes the path used for communication with the wireless terminal from a first path via a first wireless base station to a second path via a second wireless base station, the controller monitors the amount of remaining data to the wireless terminal at the first wireless base station, controls to the timing to change to the second path according to the monitor result.

Abstract: A communication controlling apparatus includes a track information storage unit that has stored therein track information including tracks passing through a management area of the communication controlling apparatus and shift patterns indicative of which cell and in what order the handover is preferably executed for when a mobile device moves on the tracks defined in a correlated manner; and a movement speed determining unit that determines whether a movement speed of the mobile device is equal to a predetermined speed or more. The apparatus also includes a track determining unit that determines a track including the mobile device in motion by extracting from the track information a track including a cell the mobile device belongs to in the shift pattern if the movement speed determining unit determines that a movement speed of the mobile device is equal to a predetermined speed or more.

Abstract: The present invention provides a communication device capable of providing a highly reliable service by detecting communication abnormality at a high speed. The communication device comprises a link configuring unit configuring a plurality of logical links between a opposite communication device, a segmenting unit segmenting transmission data as being associated with each of the plurality of logical links, a transmission unit transmitting the segmented data via the logical link associated with this segmented data, a receiving unit receiving the data via each of the plurality of logical links, and an abnormality detection unit judging, within a predetermined period of time since the data were received via any one of the plurality of logical links, if the data are not received via at least one of the remaining logical links, at least one logical link to be an abnormal logical link.

Abstract: When a failure occurs in the line of a communication network for transmitting packets using a tunnel, the disconnection messages of a plurality of tunnels which pass through the line are unified, and the occurrence of the failure is notified to an adjacent node for each line. Then, the tunnels are disconnected or switched based on a failure notice.

Abstract: Internet Protocol (IP) telephone number information system performs for the telephone number in the existing communication systems. A number information server in the system has a region information database representing an IP telephony service area for each of a plurality of Internet Service Providers (ISPs) having a corporate information database. The number information server specifies one of the plurality of ISPs from the region information database, based on a search condition input from a user terminal connected to the Internet. The specified ISP searches the corresponding corporate information database, and obtains number information matching the search condition. The number information server notifies the user terminal of the number information obtained from searching the corporate information database, in response to the search condition input from the user terminal.