Abstract: A femto base station registers IDs of neighboring macro base stations and the ID of a terminal into a management device. When the femto base station detects that the communication state of a terminal in communication with the femto base station transited from active to idle, the femto base station hands off the communication session to one of the neighboring macro stations and enters the dormant state. When the macro base station detects that the communication state of the terminal transited from idle to active, the macro base station transmits an inquiry to the management device, identifies a femto base station to be started based on the terminal ID and the macro base station ID and starts the femto base station. When the femto base station is started, it is handed off from the macro base station to the femto base station to maintain the communication session of the terminal.

Abstract: There is provided a wireless communication system in which a feedback volume is reduced as exceeding a communication speed demanded by a mobile station. The wireless communication system includes: a plurality of base stations 102a and 102b having a plurality of antennas; a plurality of mobile stations 103a to 103d having a plurality of antennas; and a base station controller 101a collectively controlling a plurality of the base stations.

Abstract: The selection range of antenna candidates effective for MIMO communication is widened in a base station to increase the throughput of MIMO communication. A terminal sends a sounding signal at given time intervals with the maximum transmission power or with an antenna selection transmission power threshold or larger. With this transmission, since the number of antenna candidates that receive the signal is increased at a base station in the distributed antenna system, the radio propagation channel state between the terminal and the base station apparatus is checked to select the combination of antennas having good orthogonality. Before the terminal sends the sounding signal, the terminal reserves beforehand the transmission timing of the sounding signal or performs carrier sensing to determine whether a surrounding terminal is sending a signal to avoid the collision/interference of packets of sounding signals between terminals.

Abstract: In a distributed antenna system in which plural antennas are dispersed spatially, a base station apparatus 102 collects the terminal throughput of the uplink and downlink communication, the number of simultaneous communication terminals, and the information on a radio propagation channel from a distributed antenna to a terminal antenna, and estimates the throughput in each communication mode from the number of simultaneous communication terminals and the radio propagation channel information, selects a communication mode by comparing the estimated throughput with a request value, connects the distributed antenna and the base station apparatus 102 in an antenna connection pattern in the selected communication mode, and switches the communication mode between the base station device and the terminal to continue the communication, when the terminal throughput is below the request value, or above the request value plus a certain threshold value.

Abstract: A bandwidth control system is provided, enabling the prevention of a resource shortage in the base station, caused by preliminary authentication which reserves resources in advance. The bandwidth control system limits a bandwidth of a communication path used for the preliminary authentication, in the case where a count of successful authentication of the wireless terminal belonging to the first wireless system and a count of successful preliminary authentication transmitted from the wireless terminal belonging to the second wireless system establish a predetermined relationship.

Abstract: A distributed antenna system that forms a plurality of communication areas and allows a plurality of terminals to communicate simultaneously, while minimizing variability in the quality of communication among the terminals. Said distributed antenna system: provides one or more logical antenna ports to wireless front-end units provided with remote radio heads (RRHs); forms a plurality of communication areas; determines the terminals that will communicate in each communication area; controls connection between the logical antenna port(s) and the front-end units per communication area; and uses signal-processing devices associated with the logical antenna ports to perform signal processing for each terminal.

Abstract: To reduce an uplink interference in a network with a first base station of a large output and a second base station of a small output. Detecting the interference, the second base station urges the first base station to hand over a terminal causing it to the second base station. Multiple base stations and one or more terminals exist in this system, each terminal connects with one base station, and a serving base station is changed according to a communication state of each terminal. If the different second base station other than the first base station to which the terminal connects detects a large interference, the second base station will multicast transmit information for urging handover to the base stations except itself. The base station having received the information specifies a terminal giving the interference to the second base station, and makes it to be handed over thereto.

Abstract: To secure a constant level or more of radio communication quality for each user equipment performing radio communication with a base station apparatus, and to increase the number of user equipment which the base station apparatus can accommodate under a condition of assuring the radio communication quality. In a radio communication system where there exist a base station apparatus having multiple antennas and user equipment for performing radio communication with a first antenna group including one or more of the antennas, the first antenna group is made configurable for each user equipment individually, and addition/deletion of the antenna to/from the first antenna group is performed based on the communication quality of each user equipment so that the number of antennas within the first antenna group may be minimized within a range satisfying a required value of the communication quality between the base station apparatus ad the user equipment.

Abstract: The selection range of antenna candidates effective for MIMO communication is widened in a base station to increase the throughput of MIMO communication. A terminal sends a sounding signal at given time intervals with the maximum transmission power or with an antenna selection transmission power threshold or larger. With this transmission, since the number of antenna candidates that receive the signal is increased at a base station in the distributed antenna system, the radio propagation channel state between the terminal and the base station apparatus is checked to select the combination of antennas having good orthogonality. Before the terminal sends the sounding signal, the terminal reserves beforehand the transmission timing of the sounding signal or performs carrier sensing to determine whether a surrounding terminal is sending a signal to avoid the collision/interference of packets of sounding signals between terminals.

Abstract: A bandwidth control system is provided, enabling the prevention of a resource shortage in the base station, caused by preliminary authentication which reserves resources in advance. The bandwidth control system limits a bandwidth of a communication path used for the preliminary authentication, in the case where a count of successful authentication of the wireless terminal belonging to the first wireless system and a count of successful preliminary authentication transmitted from the wireless terminal belonging to the second wireless system establish a predetermined relationship.

Abstract: A wireless communication system includes first and second transmitting stations cooperating with each other to transmit data signals in parallel to the same receiving station. The first transmitting station transmits data at a slot reference timing of each TDMA slot within a data transmission period. The second transmitting station calculates the adjustment amount of data transmission timing for the receiving station within a propagation delay time measurement period, and transmits data at a transmission timing determined by a slot reference timing and the adjustment amount in each TDMA slot within the data transmission period.

Abstract: An optimum communication mode and an optimum antenna are selected according to traffic and a radio propagation status of a terminal. With the use of traffic information between a base station and the terminal, an SISO communication or an SIMO communication is conducted if the traffic is small. It is determined whether the MIMO communication should be conducted, or not, if the traffic is large. An antenna that can exert the effect as the MIMO communication is selected by using the radio propagation channel state information between the distributed antennas of the base station and the antenna of the terminal. Also, because the selection of the antenna is changed by conducting the MIMO communication, an antenna optimum for the terminal that conducts the SISO communication or the SIMO communication is re-selected taking the interference influence on the terminal that conducts the SISO communication or the SIMO communication into account.

Abstract: A base station calculates numerical value data regarding hand-off quality by carrier and by neighbor station. The base station transmits the calculated numerical value data to a management apparatus. The base station receives an improvement instruction from the management apparatus, changes transmission electric power or a transmission direction of an electric wave of a carrier designated with the improvement instruction. The management apparatus determines an improvement subject base station and an improvement subject carrier from a management table using previously-set improvement determination conditions. The management apparatus transmits the improvement instruction to change the transmission electric power or transmission direction of the electric wave of the improvement subject carrier to the improvement subject base station.

Abstract: In a distributed antenna system in which plural antennas are dispersed spatially, a base station apparatus 102 collects the terminal throughput of the uplink and downlink communication, the number of simultaneous communication terminals, and the information on a radio propagation channel from a distributed antenna to a terminal antenna, and estimates the throughput in each communication mode from the number of simultaneous communication terminals and the radio propagation channel information, selects a communication mode by comparing the estimated throughput with a request value, connects the distributed antenna and the base station apparatus 102 in an antenna connection pattern in the selected communication mode, and switches the communication mode between the base station device and the terminal to continue the communication, when the terminal throughput is below the request value, or above the request value plus a certain threshold value.

Abstract: A frame time having a certain period of time is divided into: a time period (for inter-base-station time division multiplex communication) in which one of the base stations has a transmission right in the simultaneous transmission and carries out inter-base-station time division multiplex communication so as to avoid interference between the base stations; and a time period (for inter-base-station simultaneous communication) for communication which is simultaneously carried out between the plurality of base stations. Furthermore, the time periods are switched for the communication.

Abstract: A femto base station registers IDs of neighboring macro base stations and the ID of a terminal into a management device. When the femto base station detects that the communication state of a terminal in communication with the femto base station transited from active to idle, the femto base station hands off the communication session to one of the neighboring macro stations and enters the dormant state. When the macro base station detects that the communication state of the terminal transited from idle to active, the macro base station transmits an inquiry to the management device, identifies a femto base station to be started based on the terminal ID and the macro base station ID and starts the femto base station. When the femto base station is started, it is handed off from the macro base station to the femto base station to maintain the communication session of the terminal.

Abstract: There is provided a wireless communication system in which a feedback volume is reduced as exceeding a communication speed demanded by a mobile station. The wireless communication system includes: a plurality of base stations 102a and 102b having a plurality of antennas; a plurality of mobile stations 103a to 103d having a plurality of antennas; and a base station controller 101a collectively controlling a plurality of the base stations.

Abstract: A method of manufacturing an decoration film includes the steps of forming a semi-finished decoration film formed with a concave-convex pattern on a surface in a method of manufacturing a printing plate including exposure, cleaning, and drying from a photosensitive resin film; and irradiating laser on the concave-convex pattern of the semi-finished decoration film and removing an unnecessary portion to smooth concave-convex parts and/or provide difference in height of a convex part and depth of a concave part of the concave-convex pattern.

Abstract: An error correction decoder possessing a decoding method with high error correction performance and capable of operating at a low operating frequency and on a reduced circuit scale. A decoding method based on the SOVA method for improving error correction performance and boosting reliability of the soft decision output by allowing branching of paths other than the survival path at trace-back is achieved by preparing a trace-back circuit for each state, and selecting an output from that output and survival state (survival state+difference of likelihood).

Abstract: A method of manufacturing an decoration film includes the steps of forming a semi-finished decoration film formed with a concave-convex pattern on a surface in a method of manufacturing a printing plate including exposure, cleaning, and drying from a photosensitive resin film; and irradiating laser on the concave-convex pattern of the semi-finished decoration film and removing an unnecessary portion to smooth concave-convex parts and/or provide difference in height of a convex part and depth of a concave part of the concave-convex pattern.