Abstract: A process control unit (41) causes a plurality of control-target processes to operate in a memory area of a size equal to or smaller than a limiting value x. When a stopping process is detected, a resource allocation unit (43) allocates a size of a usable memory area for each of the control-target processes as a relaxed limiting value. When the stopping process is detected, the process control unit (41) causes each of the control-target processes to perform fallback operation in a memory area of a size equal to or smaller than the relaxed limiting value allocated to the process by the resource allocation unit (43).

Abstract: A process control unit (41) causes a plurality of control-target processes to operate in a memory area of a size equal to or smaller than a limiting value x. When a stopping process is detected, a resource allocation unit (43) allocates a size of a usable memory area for each of the control-target processes as a relaxed limiting value. When the stopping process is detected, the process control unit (41) causes each of the control-target processes to perform fallback operation in a memory area of a size equal to or smaller than the relaxed limiting value allocated to the process by the resource allocation unit (43).

Abstract: A wireless device that can realize a low delay while ensuring reliability when FEC is applied to multicast communication via a wireless LAN. The wireless device includes a correction-coding consecutive-transmission determination unit that determines as to which of correction-coding and consecutive-transmission of information packets should be transmitted based on communication state with a packet destination terminal, a packet identification accumulation unit that identifies and accumulates information packets acquired from the correction-coding consecutive-transmission determination unit, a correction-coding control unit that performs correction coding and correction decoding of information packets acquired from the packet identification accumulation unit, and a consecutive-transmission control unit that duplicates and complements the information packets acquired from the packet identification accumulation unit .

Abstract: A downlink data frame addressed to a terminal is copied and obtained downlink data frames are transmitted through different APs, respectively. When a plurality of same uplink data frames are received through the different APs, any one uplink data frame selected out of the uplink data frames is transmitted to its destination. An uplink data frame received from the terminal is copied and obtained uplink data frames are transmitted through different STAs, respectively. When a plurality of same downlink data frames are received through different STAs, any one downlink data frame selected out of the downlink data frames is transmitted to the terminal.

Abstract: An uplink quality information collecting unit transmits, when there is no uplink data transmission from a terminal station for a predetermined time, dummy data to a base station that is currently connected to the terminal station, and collects uplink-quality information that is generated by transmitting the dummy data to the base station. A handover determining unit determines whether to perform a handover based on the uplink-quality information collected by the uplink quality information collecting unit.

Abstract: A wireless LAN system includes at least one LAN terminal wirelessly connected to a plurality of base stations, at least one IP terminal connected to an IP network, and a diversity device connected to the IP network and that relays packet transmission between the LAN terminal and the IP terminal via the IP network. The LAN terminal sequentially establishes association with a predetermined number of the base stations, and a plurality of data is transmitted parallelly via the predetermined number of the base stations, between the LAN terminal and the diversity device. At the receiving end, one of the plurality of data is selected and output.

Abstract: A timing master device transmits a timing packet for synchronizing time of base stations at each cycle of preset time synchronization adjustment timing. The base stations adjust a local-station standard timer based on the timing packet. The base stations measure a delay time of a network form the timing master device to a local station, and adjust the local-station standard timer based on the measured delay time.

Abstract: A setting unit sets a specified time serving as a clear-to-send time, during which a two-way frame transmission is possible between a local wireless base station and a wireless terminal station accommodated in the wireless base station, and as a wireless-channel reservation time used for a frame transmission between the wireless base station and the wireless terminal station, and wireless terminal station specifying information for specifying a wireless terminal station to which the specified time is applied, in a transmission control frame. A transmitting unit transmits the transmission control frame to the wireless terminal station.

Abstract: A wireless LAB system includes at least one LAN terminal wirelessly connected to a plurality of base stations, at least one IP terminal connected to an IP network, and a diversity device connected to the IP network and that relays packet transmission between the LAN terminal and the IP terminal via the IP network. The LAN terminal sequentially establishes association with a predetermined number of the base stations, and a plurality of data is transmitted parallelly via the predetermined number of the base stations, between the LAN terminal and the diversity device. At the receiving end, one of the plurality of data is selected and output.

Abstract: A mobile radio communication system which does not need an omnidirectional channel for both a base station and a mobile station to track each other and uses only a narrow beam channel and can reduce a tracking time than before for an adjacent base station and a mobile station to search each other while a visiting area base station and the mobile station are communicating in the overlapped area. The base station and the mobile station comprise a unit for transmitting and receiving in forward or reverse channel, in different frequency, in different tracking channel using a narrow beam. Both the mobile station and the visiting area base station search the location each other, and after searched, they assign the frequency and the beam used in the tracking channel. At the same time, by comprising a searching slot in an information channel to search an adjacent base station while communicating with the visiting area base station, a tracking of other adjacent base station can be performed.

Abstract: A mobile radio communication system which does not need an omnidirectional channel for both a base station and a mobile station to track each other and uses only a narrow beam channel and can reduce a tracking time than before for an adjacent base station and a mobile station to search each other while a visiting area base station and the mobile station are communicating in the overlapped area. The base station and the mobile station comprise a unit for transmitting and receiving in forward or reverse channel, in different frequency, in different tracking channel using a narrow beam. Both the mobile station and the visiting area base station search the location each other, and after searched, they assign the frequency and the beam used in the tracking channel. At the same time, by comprising a searching slot in an information channel to search an adjacent base station while communicating with the visiting area base station, a tracking of other adjacent base station can be performed.

Abstract: A mobile radio communication system which does not need an omnidirectional channel for both a base station and a mobile station to track each other and uses only a narrow beam channel and can reduce a tracking time than before for an adjacent base station and a mobile station to search each other while a visiting area base station and the mobile station are communicating in the overlapped area. The base station and the mobile station comprise a unit for transmitting and receiving in forward or reverse channel, in different frequency, in different tracking channel using a narrow beam. Both the mobile station and the visiting area base station search the location each other, and after searched, they assign the frequency and the beam used in the tracking channel. At the same time, by comprising a searching slot in an information channel to search an adjacent base station while communicating with the visiting area base station, a tracking of other adjacent base station can be performed.