Abstract: A communication system includes: a base station device that performs wireless communication with a mobile terminal; a gateway device that is connected to the base station device and provides the mobile terminal via the base station device with a connection path to a network; an authentication server that is connected to the gateway device and issues an authentication key to the mobile terminal via the gateway device and the base station device; and a position search server which outputs a request requesting determination of position of the mobile terminal, wherein, the authentication server identifies the authentication unit from the first registration table, and outputs the request to the identified authentication unit, the authentication unit identifies the data path unit or paging controller unit from the second registration table, and the position search server obtains position information of the mobile terminal from the identified data path unit or paging controller unit.

Abstract: A parameter setting change method for a system that performs multicast distribution from an information distribution apparatus to a plurality of mobile stations via a relay node is provided. In the method, a parameter adjustment setting apparatus analyzes a data reception state output from the plurality of mobile stations and calculates an information-distribution-apparatus setting-change parameter and a relay-node setting-change parameter for making the data reception state within a predetermined range. Then, when the information distribution apparatus can be set to the information-distribution-apparatus setting-change parameter, the relay node performs setting change to the relay-node setting-change parameter.

Abstract: A communication system includes mobile IP communication apparatuses in an access service network and having proxy mobile IP client functioning units, foreign agent functioning units, and DHCP proxy functioning units, which have a common IP address. The DHCP proxy functioning unit of a first mobile IP communication apparatus, connected with a mobile station before movement, reports information about the mobile station to a second mobile IP communication apparatus connected with the mobile station after movement. The DHCP proxy functioning unit of the second mobile IP communication apparatus receives the information about the mobile station and further receives from the mobile station, an update message addressed to the common IP address, executes an IP address update process based on the information about the mobile station, and reports an update result to the proxy mobile IP client functioning unit and the foreign agent functioning unit in the second mobile IP communication apparatus.

Abstract: A communication method in a gateway apparatus includes a transmission step of transmitting and receiving packets to and from a mobile station device, and transmitting and receiving packets to and from a home agent; and a setting step of establishing settings such that the packets from the mobile station device can be transmitted to at least a first and a second home agent, and the packets from at least the first and second home agents can be received.

Abstract: A base station apparatus for performing radio communication with a terminal apparatus, the base station apparatus including: a statistical information generation unit which generates first statistical information relating to the terminal apparatus and second statistical information relating to user data at a first or second quality level; a quality selection processing unit which selects the user data at the first or second quality level based on the first and second statistical information; and a radio transmission unit which performs radio transmission to the terminal apparatus of the selected user data at the first or second quality level.

Abstract: A communication system includes: a base station device that performs wireless communication with a mobile terminal; a gateway device that is connected to the base station device and provides the mobile terminal via the base station device with a connection path to a network; an authentication server that is connected to the gateway device and issues an authentication key to the mobile terminal via the gateway device and the base station device; and a position search server which outputs a request requesting determination of position of the mobile terminal, wherein, the authentication server identifies the authentication unit from the first registration table, and outputs the request to the identified authentication unit, the authentication unit identifies the data path unit or paging controller unit from the second registration table, and the position search server obtains position information of the mobile terminal from the identified data path unit or paging controller unit.

Abstract: A communication method in a gateway apparatus includes a transmission step of transmitting and receiving packets to and from a mobile station device, and transmitting and receiving packets to and from a home agent; and a setting step of establishing settings such that the packets from the mobile station device can be transmitted to at least a first and a second home agent, and the packets from at least the first and second home agents can be received.

Abstract: A communication system includes mobile IP communication apparatuses in an access service network and having proxy mobile IP client functioning units, foreign agent functioning units, and DHCP proxy functioning units, which have a common IP address. The DHCP proxy functioning unit of a first mobile IP communication apparatus, connected with a mobile station before movement, reports information about the mobile station to a second mobile IP communication apparatus connected with the mobile station after movement. The DHCP proxy functioning unit of the second mobile IP communication apparatus receives the information about the mobile station and further receives from the mobile station, an update message addressed to the common IP address, executes an IP address update process based on the information about the mobile station, and reports an update result to the proxy mobile IP client functioning unit and the foreign agent functioning unit in the second mobile IP communication apparatus.

Abstract: A parameter setting change method for a system that performs multicast distribution from an information distribution apparatus to a plurality of mobile stations via a relay node is provided. In the method, a parameter adjustment setting apparatus analyzes a data reception state output from the plurality of mobile stations and calculates an information-distribution-apparatus setting-change parameter and a relay-node setting-change parameter for making the data reception state within a predetermined range. Then, when the information distribution apparatus can be set to the information-distribution-apparatus setting-change parameter, the relay node performs setting change to the relay-node setting-change parameter.

Abstract: A communication terminal that sends a call request to a call control apparatus that transfers the call request received from a calling terminal to a called terminal, comprises: a fault detecting unit that detects a fault when there is no response to the call request sent to the call control apparatus; a retrieval request sending unit that, when the fault is detected, generates a destination retrieval request for inquiring destination information of the called terminal and sends the destination retrieval request to at least one or more communication terminals belonging to a predetermined area; a retrieval response receiving unit that receives a destination retrieval response containing the destination information from the at least one or more communication terminal; and a call request sending unit that generates a second call request using the destination information and sends the second call request to the called terminal.

Abstract: In a connection oriented mode communication system, a communication connection is established as an alternative connection substitutive for a currently working communication connection so that the alternative connection connects the couple of node apparatus connected through the currently working communication connection to each other by way of a route physically different from that of the currently working communication connection. According to the above arrangement, it becomes possible to carry out maintenance, moving of facility or the like of a network including the currently working connection without interrupting the service which is provided through the currently working connection.

Abstract: A routing apparatus comprises a resource management unit holding resource management information for managing a state of use of a communication resource in another routing apparatus that can be an adjacent routing apparatus transferred a packet data. When packet data for a reservation request is received, a determining unit determines the adjacent routing apparatus on the basis of destination information given to the packet data and the resource management information in the resource management unit to control a routing (packet transfer). A routing process at the time of reception of a request for reserving a resource (communication resource) is performed in consideration of a state of use of a resource in the adjacent routing apparatus, thereby preventing a wasteful routing at the time of resource reservation.

Abstract: A bandwidth table holds a CBR bandwidth about a bandwidth that a CBR connection can occupy. A CAC unit controls whether or not to permit the establishment of a CBR connection while performing an overbooking bandwidth control for permitting a currently used bandwidth to exceed the CBR bandwidth, based on the CBR bandwidth set in the bandwidth table and the use state of the current CBR connection, when establishing the CBR connection.

Abstract: In a connection oriented mode communication system, a communication connection is established as an alternative connection substitutive for a currently working communication connection so that the alternative connection connects the couple of node apparatus connected through the currently working communication connection to each other by way of a route physically different from that of the currently working communication connection. According to the above arrangement, it becomes possible to carry out maintenance, moving of facility or the like of a network including the currently working connection without interrupting the service which is provided through the currently working connection.