Abstract: A mobile communication system of the present invention includes a handover control unit and a packet transfer network, which are independent of each other. The handover control unit selects a handover control system in accordance with a QoS. The handover control unit issues an instruction to the packet transfer network in accordance with the selected handover control system.

Abstract: A server device used in a mobile communication system which transfers a multicast packet sent from a sending terminal to a receiving terminal through a packet transfer network, includes: a multicast tree determination unit configured to determine a multicast tree showing a transfer route of the multicast packet; and an instruction unit configured to instruct a multicast-corresponding router within the packet transfer network to prepare a multicast transfer table used for transferring the multicast packet, in accordance with a determined multicast tree.

Abstract: A mobile communication system comprises an access router configured to assign a routing address to a transient address when receiving a user data packet including the transient address is set to a source address from a mobile terminal connecting to the access router and store a correspondence between the transient address and the routing address, and a management device configured to judge whether or not a handover is carried out by judging whether or not an existing routing address assigned to the mobile terminal by other access router than the access router to which the mobile terminal connects exists, based on a unique identifier of the mobile terminal.

Abstract: A mobile communications network and data delivery method in a mobile communications network is provided that can implement connectionless transfer in the mobile communications network, and obviate the need for sending a call control signal for data delivery. An IP address is assigned to each of the nodes of the mobile communications network including routing nodes (a gate node and repeater node, for example) and edge nodes and to each mobile station. A routing node, receiving data including the IP address of a mobile station, carries out routing of the data in accordance with routing information. The edge node that receives the data routed by the routing node, transmits the data to the mobile station corresponding to the IP address of the mobile station added to the data. The IP addresses are also applicable to delivering data to users of the same group, or carrying out control like handover.

Abstract: A mobile communication network system (1) is disclosed. The network system comprises a transport network (30) including a plurality of routers (31), and a network control apparatus (20) for controlling mobility of a mobile node (40, MN1), characterized in that the network control apparatus (20) comprises a mobility managing unit (LRM1) for managing information (CDT) of a correspondent node (41, MN2) communicating with the mobile node (40, MN1); the mobility managing unit (LRM1) comprises a boundary router detecting unit for detecting that the mobile node (MN1) moves and reaches a boundary of a router (AR2) managed by the mobility managing unit (LRM1) itself; and a correspondent node information forwarding unit for forwarding the information (CDT) of the correspondent node (MN2) to a neighbor mobility managing unit (LRM2) having a similar structure, when it is detected that the mobile node (MN1) reaches a boundary of a router (AR2) managed by the mobility managing unit (LRM1) itself.

Abstract: To provide an address dynamic assignment system, a relay apparatus, a location manager, an address management apparatus and an address dynamic assignment method for dynamically assigning terminal identification address information for identifying a mobile node without putting load on a radio section by reducing a message amount in the radio section. An MN 1 sends an LR including IPha information to an AR 2. An address acquisition necessity determination portion 21 of the AR2 determines whether or not there is a need to acquire the IPha information to be assigned to the MN 1 based on the IPha information included in the LR. An address acquisition proxy portion 22 of the AR2 acquires the IPha information. A post-address-acquisition location registration portion 23 sends an LU including the acquired IPha information to an LM 4. An assigned address notification portion 24 sends back an LRAck including the acquired IPha information to the MN 1.

Abstract: A communication system 32 is provided with access routers 14, a location information management server 20, and a route optimization server 18. The route optimization server 18 receives a BU message from a Mobile-IP terminal 12A and receives location information of a connected access router 14A from the location information management server 20. Then the route optimization server 18 transmits the BU message to the connected access router 14A, based on the received location information of the connected access router 14A, whereby the connected access router 14A to which the communication terminal 12 is connected is notified of route optimization information. This permits the connected access router 14A to relay a packet transmitted and received between the Mobile-IP terminal 12A and the communication terminal 12, through an optimal route.

Abstract: A mobile terminal MN1 according to the present invention. judges, based on a router advertisement transmitted from an access router AR1, whether handover is to be executed between access points (APs) connected to the access router AR1, and transmits a link moving notification, which indicates that handover is executed under control of the access router AR1, to the access router AR1. Further, the access router AR1 updates only routing information based on the received link moving notification.

Abstract: The problems of an additional load to an AR having the function of transferring a packet, a BR functioning as a border relay device, and an address management server, a packet loss due to an unnecessary inquiry to the management server, an increasing delay of a packet transfer, etc. can be reduced. According to the address identification information for identification of the type of an address, routers determine to which type the address assigned to a given packet belongs, a terminal identification address for identification of a source terminal and a destination terminal, a packet transfer address for transfer of the packet to another router, or an address requiring no address conversion. Thus, an address conversion network connected to an external IP network can be realized, an increased load by an inquiry about an erroneous address, etc. and a packet loss and delay due to an unnecessary inquiry can be reduced.

Abstract: A relay device acquires and stores address binding information indicating correspondence between a static communication address and a dynamic communication address of a mobile terminal which is linked to the relay device. The relay device also stores address binding information of other mobile terminals to which packets are sent from the source terminal. A management server stores the address binding information pertaining to the source terminal, and also stores the communication status information of the other mobile terminals with which the terminal is communicating. When the terminal terminates communication, the relay device and the server delete the address binding information pertaining to the source terminal by cooperating with each other.

Abstract: The invention is aimed at determining a cross over router on the occasion of a migration of a mobile terminal connected to a network during communication in the network in which the transfer part and the control part are separated from each other. The path control device receives path control information from each router and stores the information as a path control table, thereby shares the path control information with the transfer part (S1). Thereupon a pre-migration path between the mobile terminal and the correspondent terminal is recognized (S2).

Abstract: An object of the present invention is to provide a routing control device and method of generating routing control information whereby the function of connected transfer devices can be more simplified and more efficient, and routing information can be grasped appropriately. A communication system includes a plurality of transfer devices R1-R6 and a routing control device. Each of the transfer devices R1-R6 is physically connected with the routing control device and transmits the topology information (link information and metric information) possessed individually to the routing control device. The routing control device has a routing control information generating unit that generates routing control information collectively based on routing information such as the topology information transmitted from the transfer devices R1-R6. The routing control information generating unit generates a routing control table for all of the transfer devices that transmitted routing information thereto.

Abstract: The routing control system 100 according to the present invention comprises a control server 1 as the control system, and routers 10-60 as the transfer system. The control server 1 receives the temporary routing control table which is transmitted from the routers 10-60, and stores this temporary routing control table in the routing control table DB 6 as the routing control table of the router which is the transmission source. This routing control table is updated as needed when a predetermined time has elapsed from the previous update. The control server 1 refers to the data in the routing control table DB 6 constructed in this way, and performs the routing control of packets which pass through each router 10-60 on the network.

Abstract: The object of the present invention is provide a communication control system which can realize a dynamic routing control in units of flows without changing the conventional routing protocol. The routing controller 30 comprises an address information provision requester 35 configured to request the first router 10F to provide address conversion information in accordance with the received predetermined trigger and an address conversion information processing requester 35 configured to request the second router 10A to perform a predetermined processing related to the address conversion information acquired from the first router 10F.

Abstract: An object of the present invention is to provide routing control system, routing control device, transfer device and routing control method, whereby the function of transfer devices can be more simplified and more efficient, and the transfer routes of packets can be grasped and designated appropriately. The communication system includes a plurality of transfer devices R1-R6 and a routing control device. The routing control device has a routing control table and transmits, as routing control information, information regarding the initial transfer device and cost contained in a corresponding entry of the routing control table, to a transfer device which requests transmission of routing control information. The routing control information is transmitted thereto from the routing control device, thereby each of the transfer devices R1-R6 can execute packet routing processing based on the routing control information.

Abstract: The object of the present invention is to provide a radio communication system which can avoid communication route redundancy, and prevent the current location information of a source mobile terminal and the IP address of a location information management server from being revealed. The present invention comprises the steps of: converting a first address of a destination mobile terminal 2 which is included in a packet as a destination address, to a second address of the destination mobile terminal 2 which is associated with the first address of the destination mobile terminal 2, in a source router AR2; and converting the second address of the destination mobile terminal 2 which is included in the received packet as a destination address, to the first address of the destination mobile terminal 2 which is associated with the second address of the destination mobile terminal2, in a destination router AR3.

Abstract: A short cell multiplexing is provided for chiefly transmitting data shorter than the payload of a standard ATM cell (basically the data of less than 48 bytes, but the data more than 48 bytes can be allowed). A standard ATM cell assembler 1 converts various forms of input information into short cells, places the short cells in standard ATM cells efficiently considering their information length, and output them to a B/ISDN network 7. The standard ATM cell disassembler 2 disassembles the standard ATM cells, which are assembled by the standard ATM cell assembler 1 and is input through the B-ISDN network 7, into short cells, converts the short cells into those with the original input information forms, and outputs them to channels. The configuration makes it possible for the short cell ATM cell multiplexing to improve channel efficiency with small delay, and matching to the standard ATM system.

Abstract: The present invention provides a packet communications system and a transfer device which allow a network control function to be changed at low cost flexibly.

Abstract: The packet switching system for transmitting and receiving a packet via a packet switching network 100, which comprises a plurality of routing tables (#0, #1, #2 . . . ), each of which has been generated by a unique routing policy, stored in the routing apparatuses deployed at the border, at the origin or at the end of the respective routing domains, an identifier (RTI) inserted in the packet to specify the routing tables, and an identifier changer to change a value of the identifier on the packet switching network 100. The routing apparatus selects one of the routing tables (#0, #1, #2 . . . ) according to the RTI in the received packet and transfers the packet to a destination that is specified by the selected routing table.

Abstract: A router includes a clock configured to be synchronous to a transmission terminal that transmits a data packet; a comparator configured to compare a delay time of the data packet with an acceptable delay time of the data packet based on the time obtained from the clock; and a packet processing unit configured to either transfer or discard the data packet based on the comparison result of the comparator.