Abstract: The present invention provides a mobile communication network system comprising a first mobile communication network having a plurality of routers, a second mobile communication network having a plurality of routers, and a mobile communication terminal. A router located in an end section of a communication area of the first mobile communication network sends an end message indicating that it is located in the end section, to the mobile communication terminal. The terminal initiates communications with a router of the second mobile communication network, whilst the terminal is communicating with the router located in the end section, upon receiving the end message sent by the router located in the end section.

Abstract: A terminal-type judging unit judges whether a terminal is a mobile terminal or a fixed terminal. For a connection with the fixed terminal, an acceptance judging unit and a scheduling unit convert a requested bandwidth into a first resource amount using a modulation scheme used at the time of receiving a bandwidth reservation request and reserve the first resource amount. For a connection with the mobile terminal, the acceptance judging unit and the scheduling unit convert a requested bandwidth into a second resource amount using the slowest modulation scheme and reserve the second resource amount. If a higher-speed modulation scheme is usable for the connection with the mobile terminal, the scheduling unit assigns a difference between a resource amount for using the higher-speed modulation scheme and the second resource amount, to a best-effort-type connection.

Abstract: To achieve end-to-end quality guarantee in regard to communication with a mobile terminal (node) in a carrier network in which Mobile IP is presupposed, in an IP network, quality guarantee is realized by performing network resource reservation in a resource reservation server receiving a resource reservation request from a node. The resource reservation server receives the resource reservation request, and decides whether the node initiating the resource reservation request is a mobile node. When the above resource reservation request is initiated from the mobile node, resource reservation is performed for the route between the mobile node and the correspondent node via a mobility management server having a home address of the mobile node.

Abstract: Deterioration of communication quality in mobile communication through an IP network caused by a shortage of transfer capacity in a home agent or a capacity shortage in an access channel is prevented, in a mobile IP network. The mobile IP network includes a home agent and a mobile node of which location is registered in the home agent, the home agent includes a storage unit for storing channel capacity information; a registration unit for deciding based on bandwidth information in a registration request transmitted from the mobile node, whether or not the requested registration is acceptable by referring to the channel capacity information stored in the storage unit; and a transfer unit for transferring to a care-of address a packet destined to the mobile node which is decided registrable by the registration unit.

Abstract: A mobile node adapted router and home agent router operating by the IPv6 protocol able to shorten the time required for updating the current address of the mobile node and increase the speed of switching of the transfer route and providing a transfer route not passing through a home agent every time for a node not supporting this protocol, provided with a memory unit for storing a current address of a mobile node which the correspondent node should store instead of the correspondent node and a transfer unit for referring to the memory unit when receiving a packet transmitted to the home address of the mobile node, converting it to the current address, and transmitting the packet.

Abstract: In a node device which is part of a communication system with a terminal and a location registering server, a node device on a receiving side transfers, to a destination node device, a received inter-node packet, based on destination terminal location information stored in its storage portion or based on a location registering server, directly or through other devices, or the destination node device notifies a former node device (on the receiving side) of an address of its own device and the destination terminal directly or through other devices. Also, the node device on the receiving side or the destination node device notify a source node device of the address of the destination node device and the destination terminal directly or through other devices, based on a predetermined address stored in the storage portion of the terminal, the node device, or the location registering server.

Abstract: When receiving a streaming service from a service provision server, a user terminal wants QoS assurance and issues a QoS request to a QoS control server together with a communicate request to a network. In this case, by including information about a plurality of access networks that the user terminal can access in a QoS request message, a QoS control server can optimally allocate resources in the current environment of the user terminal and assure. QoS. In this case, the format of this QoS request can accompany a communicate request from the user terminal or be independent of the communicate request.

Abstract: The present invention relates to a handover technique used in a mobile communications system. For instance, a mobility management node selects an access line to be used for transferring application data, on the basis of the type of application data (http, ftp, voip, or the like) to be transferred from a communication node at the other end to a mobile node, and transfers the application data by means of the selected access line. As a result, a plurality of access lines connected simultaneously to the mobile node can be used according to the type of application, such as http, ftp, voip, or the like. Therefore, the quality desired by a user is ensured, and an attempt to effectively utilize a network can be realized.

Abstract: A mobile node is arranged to perform a high-quality hand-over operation for eliminating an interruption time in communication and keeping the continuance of communication excellent. The mobile node has a function of interfacing with networks and includes a network quality monitor, a hand-over controller, and a network controller. The network quality monitor operates to monitor a network quality based on at least one of an intensity and a radio bandwidth of a radio wave received by network devices. The hand-over controller performs the hand-over operation of transmitting a care of address to an address registering destination in response to a state of the network quality before a communication is disconnected, changing a route of communication information, and switching a connecting destination into a new network.

Abstract: The invention is directed to the provision of an IP connection processing device and, more particularly, to an IP connection processing device that, upon completion of user authentication, initiates a connection to an IP network in a designated area constructed by a wireless LAN or the like. The IP connection processing device, which processes the connection to the IP network that requires user authentication for connection to the network, comprises: detecting means for detecting authentication completion; acquiring means for acquiring an authentication result; and IP connection means for initiating or resuming the IP connection processing upon detection of the authentication completion. The IP connection means, upon detection of the authentication completion, requests IP address information from the IP network, and acquires an IP address of its own based on the information returned by the IP network.

Abstract: When a failure occurs in a node managing the location information of mobile node MN, it is possible to resume packet transfer from correspondent node CN to mobile node MN after the node is restored from the failure, in a mobile communication network. The mobile communication network includes a plurality of nodes including a home agent, a correspondent node, and a mobility anchor point connected to the network, wherein each node produces a duplication of a binding cache on receipt of location registration information from a mobile terminal, maintains and manages the duplication of the binding cache, and on restoration of the node from a failure, each node obtains the contents of the binding cache stored before the node failure from the duplicated binding cache.

Abstract: A technique to support mobile communication in an IP network in which a mobile node MN in communication with an access router detects change of a connection link, the mobile node MN sends another access router a change request regarding a first temporary address used prior to the movement of the mobile node MN based on the detected change, and a distribution router creates a cache memory in which the first temporary address is changed into a second temporary address used after the move and receives and forwards a packet destined for the first temporary address sent from a correspondent node CN to the second temporary address. Therefore, a mobile node on high-speed movement continues mobile communication and it is possible to improve efficiently use of network resources without change of an exiting network configuration and to realize data transmission/reception with less packet losses.

Abstract: An old care-of address is assigned to a mobile node in the communication area of the old access router and the mobile node is communicating with a correspondent node. Immediately before the mobile node enters the communication area of a new access router, a binding update message is transmitted to a diverging point router. The diverging point router is a router device located in the node where a route from the correspondent node to the old access router and a route from the correspondent router to the new access router are diverged. The diverging point router transfers packets addressed to the old care-of address to the new care-of address assigned to the mobile node in the communication area of the new access router.

Abstract: The present invention provides a mobile communication network system comprising a first mobile communication network having a plurality of routers, a second mobile communication network having a plurality of routers, and a mobile communication terminal. A router located in an end section of a communication area of the first mobile communication network sends an end message indicating that it is located in the end section, to the mobile communication terminal. The terminal initiates communications with a router of the second mobile communication network, whilst the terminal is communicating with the router located in the end section, upon receiving the end message sent by the router located in the end section.

Abstract: In a load balancer preserving a function of server consistency maintenance during communications even if a terminal is a mobile terminal, identifying information specific to a mobile IP terminal is extracted from an arrival packet, and a destination server to be connected is determined based on the identifying information. Also, a home agent or a terminal is requested to notify a change of the care-of address when the care-of address of the terminal has changed, and a destination server to be connected is determined by regarding the notified care-of address as identifying information.

Abstract: A gate node reports current position information of a mobile terminal managed by the gate node itself to a communicating edge node which routes a packet destined for the mobile terminal to the gate node. The communicating edge node carries out routing of the packet destined for the mobile terminal to a resident edge node based on the reported cache information in place of the gate node. This achieves high-speed handover and route optimization free from a limitation to a packet transfer route in a packet communication system.

Abstract: In a mobile node supporting router connected to a network on which a Mobile IPv4/v6 operates, an encapsulating cache stores binding information of a mobile node, and a processor encapsulates a packet addressed to the mobile node with a care-of address included in the binding information at a foreign link interface. Also, the processor receives a binding demand packet from the mobile node, and stores the binding information included in the binding demand packet in the encapsulating cache. Furthermore, the processor of the foreign link interface exchanges mobile IP messages instead of a home agent of the mobile node, and the cache stores the binding information of the mobile node included in the message.

Abstract: A mobile node adapted router and home agent router operating by the IPv6 protocol able to shorten the time required for updating the current address of the mobile node and increase the speed of switching of the transfer route and providing a transfer route not passing through a home agent every time for a node not supporting this protocol, provided with a memory unit for storing a current address of a mobile node which the correspondent node should store instead of the correspondent node and a transfer unit for referring to the memory unit when receiving a packet transmitted to the home address of the mobile node, converting it to the current address, and transmitting the packet.

Abstract: In a node device which is part of a communication system with a terminal and a location registering server, a node device on a receiving side transfers, to a destination node device, a received inter-node packet, based on destination terminal location information stored in its storage portion or based on a location registering server, directly or through other devices, or the destination node device notifies a former node device (on the receiving side) of an address of its own device and the destination terminal directly or through other devices. Also, the node device on the receiving side or the destination node device notify a source node device of the address of the destination node device and the destination terminal directly or through other devices, based on a predetermined address stored in the storage portion of the terminal, the node device, or the location registering server.

Abstract: A permanent magnet field type DC machine in which the amount of flux from field poles is changed by effective use of armature reaction thereby to improve characteristics of the DC machine. There is provided a permanent magnet field type DC machine having field poles formed of permanent magnet members and auxiliary magnetic pole members of high permeability which are provided in parallel with each other in the direction of rotation on the peripheral surface of a yoke to oppose an armature with an air gap therebetween, the auxiliary magnetic pole members being magnetized by armature reaction thereby to change the total amount of field magnetic flux from the field poles, wherein the gap between the auxiliary magnetic pole members and armature is selected to be smaller than that between the permanent magnet members and armature, thereby decreasing the reluctances in the paths of the auxiliary magnetic pole members, so that the armature reaction can be effectively used.