Abstract: A base station unit of a communication device generates control information identical with those generated by other communication devices. The control information includes information defining regions in a radio frame that are used by the communication device and the other communication devices to transmit data. A terminal unit receives data in accordance with the control information. A switching unit changes the connection among the base station unit, the terminal unit and an antenna. When the control information is output from the base station unit, a switch controller operates the switching unit so that the base station unit may be connected to the terminal unit to output the control information to the terminal unit.

Abstract: A wireless base station controls to decrease a transmission power of a first wireless terminal corresponding to signal quality information exceeding lower limitation of a range in which a transmission scheme to be selected remains unchanged and being below a first threshold value, which is greater than the lower limitation and smaller than upper limitation of the range, among a plurality of wireless terminals corresponding to signal quality information belonging to the range, while controlling to increase a transmission power of a second wireless terminal corresponding to signal quality information being equal to or greater than the first threshold value so that a transmission scheme having a better transmission efficiency is selected, thereby to improve throughput of a communication between the wireless base station and the wireless terminal.

Abstract: The present invention relates to a wireless communications method, a wireless control station, and a wireless base station. One of the objects of the present invention is to make it possible to allocate the wireless resources to more than one road side device without interference thereamong. Therefore, the allocation information in the communications regions, used by the wireless base stations in their communications with the wireless terminal from the wireless control station, is sent to each of the wireless base stations, and each of the signal base stations performs communications with the wireless terminal by using the communications region in the wireless frame corresponding to the allocation information received from the wide-area control station.

Abstract: A wireless base station controls to decrease a transmission power of a first wireless terminal corresponding to signal quality information exceeding lower limitation of a range in which a transmission scheme to be selected remains unchanged and being below a first threshold value, which is greater than the lower limitation and smaller than upper limitation of the range, among a plurality of wireless terminals corresponding to signal quality information belonging to the range, while controlling to increase a transmission power of a second wireless terminal corresponding to signal quality information being equal to or greater than the first threshold value so that a transmission scheme having a better transmission efficiency is selected, thereby to improve throughput of a communication between the wireless base station and the wireless terminal.

Abstract: The present invention relates to a wireless communications method, a wireless control station, and a wireless base station. One of the objects of the present invention is to make it possible to allocate the wireless resources to more than one road side device without interference thereamong. Therefore, the allocation information in the communications regions, used by the wireless base stations in their communications with the wireless terminal from the wireless control station, is sent to each of the wireless base stations, and each of the signal base stations performs communications with the wireless terminal by using the communications region in the wireless frame corresponding to the allocation information received from the wide-area control station.

Abstract: A base station unit of a communication device generates control information identical with those generated by other communication devices. The control information includes information defining regions in a radio frame that are used by the communication device and the other communication devices to transmit data. A terminal unit receives data in accordance with the control information. A switching unit changes the connection among the base station unit, the terminal unit and an antenna. When the control information is output from the base station unit, a switch controller operates the switching unit so that the base station unit may be connected to the terminal unit to output the control information to the terminal unit.

Abstract: In a communication network managing system, at a network manager, a management section manages QoS (Quality of Service) capability management information from element managers, a request reception section receives a request for a target QoS capability, and a section and notification section selects a candidate subnetwork such as to satisfy the target QoS capability for which the request has been received by the request reception section, and notifies the corresponding element managers of information about the selection. At the individual element manager, based on the selection information from the selection and notification section of the network manager, a control section controls the corresponding subnetwork.

Abstract: A communication device includes a congestion detecting part configured to detect congestion of traffic; and a message generation part configured to generate and send a MTU decreasing message, in a case where congestion is detected by the congestion detecting part and a packet having a MTU equal to or greater than a designated value is received; wherein the MTU decreasing message instructs a sender of the packet having the MTU equal to or greater than the designated value to decrease the MTU.

Abstract: A security server monitoring device is provided that performs quick redistribution of loads when a server load increases due to virus infections. A security server performs a virus check on data flowing through a network, thus statistical data relating to detected viruses can be obtained. For example, future communication traffic and increases and decreases in server loads are predicted using statistical information such as the number of virus infections (number of virus infections per unit of time), and on the basis of this prediction, a security server allocated to a path is quickly changed from a security server in which a high load is predicted to a security server with a comparably low load.

Abstract: A system manages a layered network including an upper layer and a lower layer. In this system, a fault or degraded performance on a lower layer line, which is a connection line in a lower layer, is detected as an event. An upper layer line, which is a connection line in an upper layer affected by the detected event, is extracted. Then, a control is conducted for the extracted upper layer line.

Abstract: A communication system for realizing a secure communication comprises a selecting device for making a selection between a communication route for a direct communication with a communication partner side and a communication route via a security checking device for checking security of communication, in accordance with a communication partner or an application corresponding to the communication. Also, the communication system comprises a device for marking a communication packet for route selection in order that the selecting device conducts a route selection in accordance with contents of the marking.

Abstract: Disclosed is a communication network management system for converting action parameters contained in abstract requirements (abstract policy information) regarding a network to parameters conforming to the network technology (ATM, SDH, WDM, etc.) and type of network element to be set, and setting these parameters in the element. Specifically, a policy administration portion converts action parameters contained in abstract policy information to parameters dependent upon network technology and a policy enforcement portion converts the parameters obtained by this conversion to parameters dependent upon type of network element to be set and sets these parameters in the element.

Abstract: In a network management apparatus which manages a network composed of network elements installing different communication technologies such as an ATM, an MPLS, and a Diff-Serv, a QoS guarantee path route candidate retriever retrieves a route enabling a predetermined QoS to be guaranteed or a route enabling the predetermined QoS to be guaranteed by being assigned with the flow identifier from among routes between a source and a destination network elements based on network configuration information, QoS guarantee capability information, the flow identifier assignment capability information, and a QoS guarantee path establishing portion performs a QoS guarantee setting and a flow identifier assignment setting to the network elements on the retrieved route.

Abstract: In a network management system performing a fault management process in a hierarchical network, an upper layer fault manager performs a fault management of an upper layer of a hierarchical network, a lower layer fault manager performs a fault management of a lower layer of the network, an inter-layer node connecting information storage portion manages connecting information between packet switching nodes composing the upper layer and link offering nodes composing the lower layer, and an inter-layer fault notifying portion notifies the upper layer fault manager, upon receiving a notification of a link fault which has occurred on a link between the link offering nodes from the lower layer fault manager, that the packet switching nodes affected by the fault are faulted, based on the connecting information.

Abstract: A communication path fault restoration system especially applicable to a multiple layered communication network is disclosed, in which spare paths are efficiently used between layers which, at the same time, perform the fault restoration process at high speed. A communication path fault restoration system for a communication network having a multiple layered structure comprises a communication path fault receiver 21 for detecting a faulty path according to the network collection information, a communication path restoration selector 22 for selecting a communication layer and the communication path on the layer for dynamically restoring the fault of the faulty path based on the determination of the information on the faulty path using a predetermined evaluation function, and a communication path restoration processing unit 23 for restoring the fault of the faulty path using the communication path on the selected communication layer.

Abstract: A system manages a layered network including an upper layer and a lower layer. In this system, a fault or degraded performance on a lower layer line, which is a connection line in a lower layer, is detected as an event. An upper layer line, which is a connection line in an upper layer affected by the detected event, is extracted. Then, a control is conducted for the extracted upper layer line.

Abstract: This invention provides a network management system with a route predicted beforehand through which a control IP packet is to be transmitted, and while setting up permission of control in a communication apparatus that checks permission of control, if the control IP packet is to be permitted, when the communication apparatus which received the control IP packet checks the permission of control with the network management system, permission of control is set up in other communication apparatuses on the predicted route over which the control IP packet is to be transmitted. For this reason, the number of checking messages of the control permission from the communication apparatuses which received the control IP packet can be reduced, while the amount of processing, such as a database search in a network management system and updating, can be reduced, and control permission to a control IP packet can be checked speedily.

Abstract: In a network management apparatus which manages a network composed of network elements installing different communication technologies such as an ATM, an MPLS, and a Diff-Serv, a QoS guarantee path route candidate retriever retrieves a route enabling a predetermined QoS to be guaranteed or a route enabling the predetermined QoS to be guaranteed by being assigned with the flow identifier from among routes between a source and a destination network elements based on network configuration information, QoS guarantee capability information, the flow identifier assignment capability information, and a QoS guarantee path establishing portion performs a QoS guarantee setting and a flow identifier assignment setting to the network elements on the retrieved route.

Abstract: In a network management system performing a fault management process in a hierarchical network, an upper layer fault manager performs a fault management of an upper layer of a hierarchical network, a lower layer fault manager performs a fault management of a lower layer of the network, an inter-layer node connecting information storage portion manages connecting information between packet switching nodes composing the upper layer and link offering nodes composing the lower layer, and an inter-layer fault notifying portion notifies the upper layer fault manager, upon receiving a notification of a link fault which has occurred on a link between the link offering nodes from the lower layer fault manager, that the packet switching nodes affected by the fault are faulted, based on the connecting information.

Abstract: A communication network comprised of communication paths of server layers formed hierarchically by communication paths of client layers, wherein the state of control of the communication paths of a layer being controlled is independently managed in terms of both (i) an administrative state and (ii) a subordinate state indicating influence from communication paths of a server layer, the administrative state of the communication paths of the layer being controlled is changed according to the control for setting and releasing the communication paths, and the subordinate state of the communication paths of a client layer influenced by the change of the administrative state of the communication paths is changed accordingly. At this time, when a subordinate state has already been influenced by a state of control of the communication paths of a server layer, the processing for management is terminated.