Abstract: A communication system, wherein a switch node to which a terminal is connected can be recognized, and a flow table can be updated promptly in accordance with the status of the switch node. The communication system includes: a switch node that operates in accordance with a flow table in which processing content is defined for each of a plurality of flows, and a flow control device that includes a terminal management unit that records, based on a request to set a flow entry from the switch node, information of association between a terminal of a packet source and a switch node to which the terminal is connected, wherein the flow control device refers to the information of association to make the switch node execute a modification or deletion of a flow entry in the flow table.

Abstract: A flow control apparatus that sends control information to one or more switching node apparatuses, where the control information is assigned to each series of communications performed between terminal devices via the switching node apparatuses. The flow control apparatus includes an effective time setting unit that sets an effective time of the control information based on an elapsed time measured from when the terminal devices which perform the series of communications start a communication via a specific one of the switching node apparatuses, in a manner such that the longer the elapsed time, the longer the effective time; and a sending unit that sends the control information every time when the effective time has elapsed.

Abstract: A communication system comprises a first communication device that transmits a setup request that causes a tunnel to be set up such that a first tunnel address of said first communication device and a second tunnel address of a second communication device are tunnel interfaces and a tunnel management server that receives said setup request from said first communication device and that, when said second communication device has a plurality of said second tunnel addresses, combines said plurality of second tunnel addresses and said first tunnel address and sets up a plurality of tunnels.

Abstract: A mobile unit managing network is provided which is capable of supporting a communication area being wider than ever by one highest-layer router. A radio base station transfers a path updating notification fed from a mobile terminal to a lowest-layer router. The lowest-layer router establishes a path in which a network address to the mobile terminal exists in the radio base station and transfers path information to an intermediate-layer router serving as an upward router. The intermediate-layer router establishes a path in which the network address to the mobile terminal exists in the lowest-layer router and transfers path information to the highest-layer router. The highest-layer router, when having received path information notification from the intermediate-layer router, establishes a path in which the network address to the mobile terminal exists in the intermediate-layer router.

Abstract: A system and method of establishing and routing paths in a network hierarchy is disclosed. A radio base station updates a path from a mobile terminal to a lowest-layer router. The lowest-layer router establishes a path in which a network address to the mobile terminal exists in the radio base station and transfers path information to an intermediate-layer router serving as an upward router. The intermediate-layer router establishes a path in which the network address to the mobile terminal exists in the lowest-layer router and transfers path information to the highest-layer router. The highest-layer router, when having received path information notification from the intermediate-layer router, establishes a path in which the network address to the mobile terminal exists in the intermediate-layer router.

Abstract: The present invention provides a communication network comprising a host network, a plurality of base stations, at least a mobile host capable of establishing links to the base stations, and a hierarchy-network of plural routers which are improved in transferring performances for ensuring continuous operations with a reduced load without packet loss.

Abstract: In a proxy mobile IP system, a mobility anchor comprises: a proxy mobile IP registration unit effectuating proxy mobile IP registration in proxy mobile IP (Internet Protocol) communication by one or more registration notification messages from an access gateway; and a last registration time recording/management unit effectuating recording and management of time of last registration by the registration notification message. The mobility anchor, on receipt of a new registration notification message, determines, in case a receipt time difference (or a receipt time interval) between the time of receipt of the new registration notification message and a registration notification message recorded last time in the last registration time recording/management unit is within a pre-set period of time, and the access gateway has changed by switching, possibility of order reversal of the new registration notification message and the registration notification message recorded last time.

Abstract: A proxy mobile IP system comprises: a mobile terminal including a time management/notification unit; the time management/notification unit alerting time information, managed by the mobile terminal itself, to an access gateway at the time of access authentication in proxy mobile IP (Internet Protocol) communication; the access gateway; the access gateway including a time information acquisition/management unit alerting the time information, received from the mobile terminal, to a mobility anchor, at the time of performing proxy mobile IP registration in the proxy mobile IP communication, as the time information received from the mobile terminal is carried on a registration notification message; and the mobility anchor; the mobility anchor including a time information acquisition/management unit alerting the registration notification message including the time information to a proxy mobile IP registration unit responsible for performing proxy mobile IP registration.

Abstract: A mask blank container is adapted to house a mask blank with a resist film. The container comprises a container body 5 for receiving the mask blank; a cap member 6 to be put on the container body; and a fixing member 9 adapted to fix the container body and the cap member to each other when the cap member is put on the container body. The container body and the cap member have fitting portions 51 and 61 made of a resin material and fitted to each other, respectively. The fixing member comprises a first member 91 having an engaging portion 91 a to be engaged with the fitting portion of the cap member, and a second member 92 having an engaging portion 93 to be engaged with the fitting portion of the container body. A distance between the engaging portions of the first and the second members is desired to be variable.

Abstract: A mobile communication system includes a management agent, server, and temporary server. The management agent manages the destination of a mobile node. The server serves as a communication partner of the mobile node. The temporary server has a network function equivalent to that of the server. The management agent includes a position registration unit which registers position information of the destination of the mobile node when the mobile node moves, and a server function relocation unit which sets the temporary server as the communication partner of the mobile node instead of the server. A management agent apparatus and server function moving method are also disclosed.

Abstract: To suppress communication delay and data loss caused by the radio type of a mobile terminal and the radio communication band when a communication packet is sent to the mobile terminal in a mobile IP system. A mobile IP control system includes: a radio base station (40A) which provides a radio connection link to a mobile terminal (50); a home agent (20) which transfers a communication packet transmitted from a partner terminal (60), to the mobile terminal (50); and a foreign agent (30A) which relays mutual communication between the foreign agent (30A) and the radio base station (40A). The foreign agent (30A) notifies the home agent (20) of the communication band of the radio communication performed between the radio base station (40A) and the mobile terminal (50). The home agent (20) performs band control for packet transmission to the mobile terminal (50) in accordance with the notified communication band.

Abstract: The present invention provides a setting information registration apparatus that can prevent unnecessary setting information from being generated, when setting information needed at the time of performing wireless communication is generated. A setting information registration apparatus (100) arbitrarily collects unique identification information of unspecific apparatuses, and extracts unique identification information of a specific wireless apparatus (STA) from the arbitrarily collected identification information. In addition, the setting information registration apparatus (100) generates setting information needed when a wireless apparatus performs wireless communication, on the basis of the extracted identification information, and registers the generated setting information in wireless control apparatuses (200, 201, 300, and 301).

Abstract: The present invention is directed to perform high-reliable authentication using a one-way function that a communication is a communication which was performed with the same apparatus to be authenticated by storing a password only in an apparatus to be authenticated (it is unnecessary to store a password in both of an authentication apparatus and an apparatus to be authenticated) without transmitting a challenge code. When a setting is updated in a setting management server, authentication is performed by using a one-time password obtained last time. A sound communication terminal performs a process using a hash function once on a one-time password transmitted this time, and performs authentication by determining whether the processed one-time password matches a one-time password obtained last time or not. Whether the information at the time of the change in the setting is proper or not is determined by a sound terminal.

Abstract: In a wireless communication system including a setting information managing device for managing setting information required for wireless communication, an access point, and a base station belonging to the access point for conducting wireless communication, the station belongs to the access point using connecting information for wireless connection to a setting network, connects via the access point to the managing device on the setting network, and obtains the setting information from the managing device. In this way, in the wireless communication system, the setting information required for wireless communication can be obtained by use of the connecting information for wireless connection to connect to the setting network.

Abstract: The present invention provides a communication network comprising a host network, a plurality of base stations, at least a mobile host capable of establishing links to the base stations, and a hierarchy-network of plural routers which are improved in transferring performances for ensuring continuous operations with a reduced load without packet loss.

Abstract: A control unit collects transfer ability information of respective base stations, load information such as the number of mobile stations belonging to the base stations and a communication traffic amount, and information on base stations to which the respective mobile stations belong. When the control unit detects that a mobile station has moved across a sub-network, the control unit dynamically selects a transfer source base station that can keep a stable communication quality from a moving source sub-network to a moving destination sub-network, dynamically establishes a stable communication path between the sub-networks, and stably keeps a communication quality for the mobile station.

Abstract: In an IP telephone communication system at least including a plurality of Access Points and stations under control of the Access Points, each of the Access Points determines presence or absence of a station in a silent state not conducting IP telephone communication among stations having established communication lines for IP telephone communication and conducts, when presence of the station in a silent state is determined, pseudo IP telephone communication corresponding to a state in which the station in a silent state conducts IP telephone communication. According to the system, even if there exists a station in the silent state not conducting IP telephone communication, it is possible to determine connectibility of IP telephone communication with high reliability.

Abstract: The present invention provides a communication network comprising a host network, a plurality of base stations, at least a mobile host capable of establishing links to the base stations, and a hierarchy-network of plural routers which are improved in transferring performances for ensuring continuous operations with a reduced load without packet loss.

Abstract: A band measurement device that measures a residual idle band available for a wireless LAN communication is provided. A band measurement device (corresponding to one of access points AP1-N) transmits null data corresponding to a virtual idle band and measures a band of actually transmitted null data. Then, the measured band of the null data is determined to be a residual idle band actually available for a wireless LAN communication.

Abstract: A MAC address management system acquires code data obtained by encoding a temporary MAC address that can be temporarily used and decodes the acquired code data to perform wireless communication. The MAC address management system includes a MAC distributing server device in which a temporary MAC address which can be temporarily used is stored and a wireless communication device that acquires the temporary MAC address from the MAC distributing server device and performs wireless communication by using the acquired temporary MAC address, the wireless communication device acquires code data obtained by encoding the temporary MAC address from the MAC distributing server device, decodes the acquired code data, and performs wireless communication by using the decoded temporary MAC address.