Abstract: A radio communication system for connecting mobile nodes to public network, include base stations connected to mobile nodes by radio, node registration devices connected to control the stations and register node registration information representing contents of node connection to the node registration device through the station into node information management device which is connected to public network and manages mobile node address information in registration information registered by the node registration devices. A combination of the base station and node registration device controlling the station and a combination of the station, node registration device controlling the station, other node registration device and one or a plurality of the node information management device constitute different communication routes any of which is utilized to realize connection from node to public network.

Abstract: The context information management system enables the management of context information while maintaining the security of user information. It includes a user domain management server that manages a list of domains in which users have an account, and a one-time account management server that manages temporarily issued one-time accounts for a user's account. For an account information notifying request from a client, it notifies an account group ID corresponding to the user ID, and a one-time account issued for the account group ID to the client, thereby enabling the management of the user's account and context information while hiding the user ID.

Abstract: A communication application control technology in which the location and status (context) of a user from a sensor net, and the communication application is controlled based on the context information. A sensor net server (or a presence server) manages the location and status of a user as well as group information detected by a sensor, and an application server obtains the user information included in the group from the sensor net server (or a presence server), and establishes a session with that user. This invention is applicable to various applications including the PTT (Push-to-Talk) and 3PCC.

Abstract: An optical line terminal includes an optical network interface having an optical receiver unit to convert an optical signal received from an optical network unit into an electrical signal and output a direct current bias monitoring signal and an error code detector to detect an error code in the electrical signal to output an error code indication signal, a storage to store therein a direct current bias table indicating a direct current bias corresponding to a direct current bias control parameter of the optical network units and a dynamic band allocation information table indicating communication time slot information allotted to each optical network unit and a control unit to receive the direct current bias monitoring signal and the error code indication signal and supply the direct current bias control signal to the optical receiver unit to thereby form one feedback circuit together with the optical network interface.

Abstract: With respect to a communication operation between networks having no connection permission, a connection control apparatus calculates a communicatable detour communication path from a connection policy database, and in such a case that a communication operation can be carried out between these networks having no connection permission, the connection control apparatus permits the communication operation via a detour communication path after authentication.

Abstract: The present invention implements communication control with user's service subscription information reflected in a mobile communication network. A QoS control server for providing a communication quality control function of a network, a user information management server for managing user's service information, a service proxy server for transferring a service control message transmitted by a user to a service control server, a service relay server for relaying a message between service control servers in two different networks, and a service control server for exercising service control based on user service information are included. In user service start processing, the service control server or service relay server transmits a service control message inclusive of service subscription information acquired beforehand to the service proxy server. The QoS control server acquires the service subscription information from the service proxy server.

Abstract: A data transmission control server is connected to a network, and communicates with a data transmission server, a data transmission auxiliary server, and a client via the network. The data transmission server and the data transmission auxiliary server respectively include: a network interface that transmits data to the client based on a client request; a data transmission information database having stored therein a data identifier for identifying transmission data, a data transmission address for specifying an address of the transmission data, and a data transmission beginning time indicative of a beginning time of data transmission; and a control unit that controls the data transmission server and the data transmission auxiliary server so as to transmit data to the client by transmitting transmission data session information to the data transmission server and the data transmission auxiliary server b a data transmission request from the client.

Abstract: A data transmission system includes a server, a network and a plurality of terminals. The server sends data to the terminals via the network and the network connects the server and the plurality of terminals, and the terminal includes a network interface unit that connects to the network and communicates with the other terminals or the server via the network, a storage unit that stores reception data and information on missing of data, a detection unit that detects that the reception data is missing or damaged, and a controller that controls the network interface unit to send a repair request message to the other terminals through multicast when the detection unit detects missing or damaged data of data received from the server, and that controls the network interface unit to send a repair request message to the server when there is not requested data in the other terminals.

Abstract: An optical line terminal connecting with numbers of optical network units comprises a control unit which controls each optical network unit to make it operate in a first mode in which transmission and reception of control messages and data are possible or in a second mode in which the transmission and reception of control messages are possible but the transmission of data is impossible, according to a communication permission request transmitted from an optical network unit and based on a preset maximum number of optical network units permitted to execute upstream communication from the optical network unit to the optical line terminal.

Abstract: A passive optical network system according to the present invention includes an optical network unit and an optical line terminal connected to a plurality of optical network units. The optical line terminal has: an interface which receives from the optical network unit, a logical link assignment request message containing a communication priority for deciding a priority of a communication flow between a source terminal and a destination terminal, from the destination; and a control unit which assigns a logical link identifier for identifying a communication flow to the logical link assignment request message received from the interface and controls the interface so as to communicate with the optical network unit by using the communication priority.

Abstract: A communications controller according to the present invention includes a network interface, and a control unit for, when the network interface receives a request information for requesting establishment of a new multicast communications flow, judging whether or not the new multicast communications flow can be established with respect to a base station, based on communications quality parameters of the other multicast communications flows already established with a plurality of base stations, and a communications quality parameter of the new multicast communications flow, the new multicast communications flow being to be transferred by way of the base station, and establishing the new multicast communications flow if result of the judgment on the base station is YES, the new multicast communications flow being to be transferred by way of the base station.

Abstract: In the bandwidth-allocating method of the present invention for PON (: Passive Optical Network), a bandwidth is allocated from an optical line terminal to each optical network unit. The optical line terminal stores a bandwidth contract table for indicating a correspondence relationship between communication flow IDs and service quality parameters, each communication flow ID identifying each communication flow between the optical line terminal and each optical network unit. The bandwidth-allocating method includes a step of transmitting a service-quality request message including the communication flow IDs and the service quality parameters from each optical network unit to the optical line terminal, and a step of the optical line terminal's updating the bandwidth contract table based on the service quality parameters, and performing the bandwidth allocation to a communication flow specified by the corresponding communication flow ID based on the bandwidth contract table.

Abstract: A system includes a contents management server that manages the locations of contents, a contents server that manages contents, a client terminal that receives or stores contents, and a network. The client terminal sends a contents sending request message to the contents management server. The contents management server, which has received the request from the client terminal, detects the network to which the client terminal belongs, instructs the contents server, which manages the network, to stream the contents. After that, the contents management server checks if there is a client terminal related to the client terminal that has sent the contents sending request. If there is a related client terminal, the contents management server instructs the contents server, which manages a network to which the related terminal belongs, to store the contents.

Abstract: The context information management system enables the management of context information while maintaining the security of user information. It includes a user domain management server that manages a list of domains in which users have an account, and a one-time account management server that manages temporarily issued one-time accounts for a user's account. For an account information notifying request from a client, it notifies an account group ID corresponding to the user ID, and a one-time account issued for the account group ID to the client, thereby enabling the management of the user's account and context information while hiding the user ID.

Abstract: A communication application control technology in which the location and status (context) of a user from a sensor net, and the communication application is controlled based on the context information. A sensor net server (or a presence server) manages the location and status of a user as well as group information detected by a sensor, and an application server obtains the user information included in the group from the sensor net server (or a presence server), and establishes a session with that user. This invention is applicable to various applications including the PTT (Push-to-Talk) and 3PCC.

Abstract: To group plural applications and integrally manage their presence information. A presence server includes plural clients that receive services from application servers providing plural services, and a presence information that manages presence information of applications and group information. The presence server receives presence information registration from the application clients, updates presence information of all applications having the same group ID as that of an application of presence information registration source in an application type registration table according to the content of registered presence information, and reflects its result in a presence information table.

Abstract: Disclosed here is an integrated application system for enabling a new application to be added and a user to select an optional application easily. The integrated application system includes a plurality of clients for receiving services from a plurality of application servers for supplying a plurality of services and a management apparatus for controlling services supplied by the application servers to the clients according to an integrated service starting request from any of clients. Each of the clients includes a client management unit for controlling participation of a plurality of application clients corresponding to a plurality of services in an integrated service.

Abstract: Disclosed here is an integrated application system for enabling a new application to be added and a user to select an optional application easily. The integrated application system includes a plurality of clients for receiving services from a plurality of application servers for supplying a plurality of services and a management apparatus for controlling services supplied by the application servers to the clients according to an integrated service starting request from any of clients. Each of the clients includes a client management unit for controlling participation of a plurality of application clients corresponding to a plurality of services in an integrated service.

Abstract: With respect to a communication operation between networks having no connection permission, a connection control apparatus calculates a communicatable detour communication path from a connection policy database, and in such a case that a communication operation can be carried out between these networks having no connection permission, the connection control apparatus permits the communication operation via a detour communication path after authentication.