Abstract: A communication system including: a base station; and a terminal configured to: select a known signal from at least one first known signal included in a plurality of known signals that is divided into the at least one first known signal and at least one second known signal, each of the at least one first known signal indicating that the terminal transmits a following uplink signal including a specific data, each of the at least one second known signal indicating that the terminal transmits the following uplink signal not including the specific data, the following uplink signal being transmitted from the terminal to the base station in association with the selected known signal, and transmit the selected known signal to the base station.

Abstract: A wireless communication system includes a machine to machine (M2M) device, and a base station that performs wireless communication with the M2M device. The M2M device includes a check-signal transmitting unit that transmits, after a bearer in a wireless section between itself and the base station is released, a check signal to the base station every first period by wireless communication using a frequency that is used in the bearer. The base station includes a determining unit and a notifying unit. The determining unit determines whether there is an abnormality in wireless connection between itself and the M2M device based on whether a check signal is received from the M2M device within a second period. The notifying unit notifies, when the determining unit determines that there is an abnormality in the wireless connection between itself and the M2M device, the abnormality to a predetermined notification destination.

Abstract: An apparatus acquires a parameter set including first and second parameter subsets. The first parameter subset stores first throughput and first power consumption that are measured, before a handover of a mobile station, by each base-station belonging to a measurement target group including a plurality of handover-candidate base-stations and a handover-source base-station. The second parameter subset stores second throughput and second power consumption that are estimated by each base-station belonging to the measurement target group, on the assumption that the mobile station is handed over to the each base-station.

Abstract: A communication system including: a base station; and a terminal configured to: select a known signal from at least one first known signal included in a plurality of known signals that is divided into the at least one first known signal and at least one second known signal, each of the at least one first known signal indicating that the terminal transmits a following uplink signal including a specific data, each of the at least one second known signal indicating that the terminal transmits the following uplink signal not including the specific data, the following uplink signal being transmitted from the terminal to the base station in association with the selected known signal, and transmit the selected known signal to the base station.

Abstract: A wireless communication system includes a first relay station that includes a first storage and performs wireless communication with a first base station coupled to an exchange by a wire, and a mobile device that performs wireless communication with the first relay station. The first relay station receives first data with a first sequence number from the first base station, and stores the first data with a second sequence number into the first storage, the first relay station selects a first node as a handover destination, and when the first node is a second base station coupled to the exchange by a wire, the first relay station receives second data with a third sequence number from the first base station, and transmits the first data with the second sequence number and the second data with a fourth sequence number continuous to the second sequence number to the second base station.

Abstract: A control method for controlling base station apparatuses used in a communication system comprising a first base station apparatus, a second base station apparatus, and one or more mobile station apparatuses, including determining whether or not a first condition relating to the number of the mobile station apparatuses positioned in the overlapping area of the cover area of the first base station apparatus and the cover area of the second base station apparatus and to respective output power of the mobile station is satisfied, and outputting a radio signal from the second base station apparatus if the first condition is satisfied.

Abstract: A base station, to which a cell belongs and which communicates with a relay node to which a relay node cell belongs, including a control unit configured, at a time of handing over the relay node from another cell belonging to a first base station to the cell belonging to the base station, to request the relay node to measure wireless quality of neighbor cells of the cell belonging to the base station and report a measurement result of the wireless quality, and to update by adding or deleting, if the measurement result of the wireless quality of a first neighbor cell among the neighbor cells is higher or lower than a predetermined threshold for the cell existing at the handover destination of the relay node, the relay node cell to or from a first neighbor cell list of the first neighbor cell, respectively.

Abstract: A base station, to which a cell belongs and which communicates with a relay node to which a relay node cell belongs, includes a control unit configured, at a time of handing over the relay node from the cell of the base station to a first cell belonging to a first base station, to extract information indicative of a non-overlapping cell between a first handover destination neighbor cell list containing neighbor cell information of a first neighbor cell adjacent to the first cell at a handover destination and a first handover source neighbor cell list containing neighbor cell information of a neighbor cell adjacent to the cell at a handover source, and to update a neighbor cell list corresponding to the non-overlapping cell by deleting the relay node cell belonging to the relay node from the neighbor cell list based on the information indicative of the non-overlapping cell.

Abstract: A frequency band adjusting method, in a first communication system and a second communication system sharing usable frequency band with each other, for adjusting the frequency band used by a first communication apparatus in the first communication system, comprising: determining whether or not increase in the frequency band used by the first communication apparatus is necessary based on the frequency band used by the first communication apparatus and the number of access to the first communication apparatus; determining whether or not increase in the frequency band used by the first communication apparatus is to be approved, according as there is or there is not unused frequency band not used by a second communication apparatus in the second communication system having coverage overlapping with the first communication apparatus; and, if increase is approved, increasing the frequency band used by the first communication apparatus.

Abstract: A communication method in a mobile communication system that transmits different data to which transmission sequence numbers have been attached, over each of a plurality of paths from a mobile station to a radio network controller via a plurality of base stations; where the radio network controller monitors the communication state of each path, determines to transmit the data over all of a plurality of paths, transmit the data over two or more specified paths, or transmit the data over only one specified path, based on the communication state of each path, and notifies the mobile station of the determined path/paths; and where the mobile station transmits different data to which different transmission sequence numbers have been attached, over said notified path/paths, and the radio network controller rearranges the data received from each path by reference to the transmission sequence numbers and transmits the rearranged data to a core network.

Abstract: A wireless communication system includes a first relay station that includes a first storage and performs wireless communication with a first base station coupled to an exchange by a wire, and a mobile device that performs wireless communication with the first relay station. The first relay station receives first data with a first sequence number from the first base station, and stores the first data with a second sequence number into the first storage, the first relay station selects a first node as a handover destination, and when the first node is a second base station coupled to the exchange by a wire, the first relay station receives second data with a third sequence number from the first base station, and transmits the first data with the second sequence number and the second data with a fourth sequence number continuous to the second sequence number to the second base station.

Abstract: In a communication system 10, a management device 100, which is under the control of the MVNO, collects radio quality information from a UE 500 by using a communication channel established between the management device 100 and the UE 500, selects an optimum cell by using the collected radio quality information, and notifies the UE 500 of the selected optimum cell. The UE 500 then connects or hands over to the optimum cell notified by the management device 100.

Abstract: A first maintenance signal is exchanged between a server coupled to a base station and a processing unit inside a mobile device, via a wireless channel between the base station and the mobile device, to confirm establishment of a session between the server and the processing unit. The base station sends, to the server, one of control signals according to a connection state of the wireless channel, without sending the received first maintenance signal to the mobile device via the wireless channel, where the control signals includes a second maintenance signal, a session disconnected signal, and a session established signal. The mobile device sends, to the processing unit, one of the control signals according to a connection state of the wireless channel, without sending the received first maintenance signal to the server via the wireless channel.

Abstract: An apparatus acquires a parameter set including first and second parameter subsets. The first parameter subset stores first throughput and first power consumption that are measured, before a handover of a mobile station, by each base-station belonging to a measurement target group including a plurality of handover-candidate base-stations and a handover-source base-station. The second parameter subset stores second throughput and second power consumption that are estimated by each base-station belonging to the measurement target group, on the assumption that the mobile station is handed over to the each base-station.

Abstract: A base station, to which a cell belongs and which communicates with a relay node to which a relay node cell belongs, includes a control unit configured, at a time of handing over the relay node from the cell of the base station to a first cell belonging to a first base station, to extract information indicative of a non-overlapping cell between a first handover destination neighbour cell list containing neighbour cell information of a first neighbour cell adjacent to the first cell at a handover destination and a first handover source neighbour cell list containing neighbour cell information of a neighbour cell adjacent to the cell at a handover source, and to update a neighbour cell list corresponding to the non-overlapping cell by deleting the relay node cell belonging to the relay node from the neighbour cell list based on the information indicative of the non-overlapping cell.

Abstract: A base station, to which a cell belongs and which communicates with a relay node to which a relay node cell belongs, including a control unit configured, at a time of handing over the relay node from another cell belonging to a first base station to the cell belonging to the base station, to request the relay node to measure wireless quality of neighbour cells of the cell belonging to the base station and report a measurement result of the wireless quality, and to update by adding or deleting, if the measurement result of the wireless quality of a first neighbour cell among the neighbour cells is higher or lower than a predetermined threshold for the cell existing at the handover destination of the relay node, the relay node cell to or from a first neighbour cell list of the first neighbour cell, respectively.

Abstract: A control method for controlling base station apparatuses used in a communication system comprising a first base station apparatus, a second base station apparatus, and one or more mobile station apparatuses, including determining whether or not a first condition relating to the number of the mobile station apparatuses positioned in the overlapping area of the cover area of the first base station apparatus and the cover area of the second base station apparatus and to respective output power of the mobile station is satisfied, and outputting a radio signal from the second base station apparatus if the first condition is satisfied.

Abstract: A frequency band adjusting method, in a first communication system and a second communication system sharing usable frequency band with each other, for adjusting the frequency band used by a first communication apparatus in the first communication system, comprising: determining whether or not increase in the frequency band used by the first communication apparatus is necessary based on the frequency band used by the first communication apparatus and the number of access to the first communication apparatus; determining whether or not increase in the frequency band used by the first communication apparatus is to be approved, according as there is or there is not unused frequency band not used by a second communication apparatus in the second communication system having coverage overlapping with the first communication apparatus; and, if increase is approved, increasing the frequency band used by the first communication apparatus.

Abstract: A communication method in a mobile communication system that transmits different data to which transmission sequence numbers have been attached, over each of a plurality of paths from a mobile station to a radio network controller via a plurality of base stations; where the radio network controller monitors the communication state of each path, determines to transmit the data over all of a plurality of paths, transmit the data over two or more specified paths, or transmit the data over only one specified path, based on the communication state of each path, and notifies the mobile station of the determined path/paths; and where the mobile station transmits different data to which different transmission sequence numbers have been attached, over said notified path/paths, and the radio network controller rearranges the data received from each path by reference to the transmission sequence numbers and transmits the rearranged data to a core network.

Abstract: A communication method in a mobile communication system that transmits different data to which transmission sequence numbers have been attached, over each of a plurality of paths from a mobile station to a radio network controller via a plurality of base stations; where the radio network controller monitors the communication state of each path, determines to transmit the data over all of a plurality of paths, transmit the data over two or more specified paths, or transmit the data over only one specified path, based on the communication state of each path, and notifies the mobile station of the determined path/paths; and where the mobile station transmits different data to which different transmission sequence numbers have been attached, over said notified path/paths, and the radio network controller rearranges the data received from each path by reference to the transmission sequence numbers and transmits the rearranged data to a core network.