Abstract: A radio communication system, including; a first and second base station; and at least one terminal, wherein the first base station including: an advertisement message generation unit which generates an advertisement message including channel information of the second base station; a handover request message generation unit which generates a handover request message including a handover instruction to the second base station; and a transmission unit which transmits the advertisement message and the handover request message to the terminal, and the terminal including: a receive unit which receives the advertisement message and the handover request message; and a terminal side handover processing unit which detects whether a handover to the second base station instructed by the handover request message is possible, and performs handover to the second base station, using the channel information of the second base station included in the advertisement message, if the handover can be possible.

Abstract: A technology in a relay system for relaying communication data between a plurality of domains by an address translation, is capable of executing, even when there are both streams of inter-domain and intra-domain communications, the communications with security ensured without setting a complicated packet filter between the domains, and routing a packet at a high speed within the domain.

Abstract: A handover method, in a wireless communication system having a mobile station and a plurality of base stations, for performing handover of the mobile station from a connected base station to a neighbor base station, the method having the steps of: deciding that neighbor base station information non-reception handover is establish; searching a connectable neighbor base station; acquiring identification information for the neighbor base station; transmitting a handover request including the acquired identification information; transmitting, in the connected base station received the handover request, to the mobile station, service level information included with in a handover response, and deciding a handover destination based on the service level information.

Abstract: Included are a communication control device applied to a wireless communication system 1 which establishes a wireless communication between a base station 2 and a mobile terminal 3, has: a handover control unit 9 controlling a handover process of the mobile terminal 3; and a setting unit 8 setting a period of retain time of connection information used when the mobile terminal 3 reconnects to a handover source base station 2 by interrupting the handover process, wherein the handover control unit 9, after the mobile terminal 3 has started the handover process, controls the handover process of the mobile terminal 3 so as to retain the connection information till the retain time set by the setting unit 8 elapses, and the setting unit 8 changes setting of the retain time, corresponding to a communication status between the handover source base station 2 and the mobile terminal 3.

Abstract: In a network apparatus including a forwarding unit corresponding to a base point for conducting packet transmission/reception with an external network, and plural control units for operating plural applications that are arranged to access virtual interfaces of the control units that correspond to actual interfaces of the forwarding unit so that the network apparatus appears from the outside to be functioning as a single unit. A routing process of generating a routing table is executed at a master control unit corresponding to one of the control units, and if the routing table of the master control unit is updated, a routing table of the forwarding unit is updated by a routing synchronization process that operates independently from the routing process. One or more routing tables of one or more slave control units corresponding to the control units other than the master control unit are updated through the forwarding unit.

Abstract: A packet processing system including a forwarding apparatus that sends and receives a packet by using a network interface and a control apparatus that includes an application receiving the packet is provided. The control apparatus includes: a symbol part corresponding to the forwarding apparatus; and a transfer control part for sending a request message, to the forwarding apparatus, requesting the forwarding apparatus to set a packet transfer rule for transferring a receiving packet to the application; and the forwarding apparatus includes: a transfer control part for setting the packet transfer rule as requested by the request message; wherein the packet transfer rule includes an interface identifier corresponding to the communication port; and when the control apparatus detects that the interface identifier is changed, the control apparatus sends a correction message, to the forwarding apparatus, requesting the forwarding apparatus to correct the interface identifier in the packet transfer rule.

Abstract: A packet relaying apparatus is structured to comprise a network relaying function for selecting one or more networks allowed to relay an received packet based on the transmission source network identifier corresponding to the received packet, a domain relaying function for selecting one or more routing domains corresponding to one or more networks, a routing information management function for collating the transmission destination address of the packet with each routing domain information of one or more routing domains to select the next hop router address for transmitting the packet to the next packet relaying apparatus, and a packet relaying function for transmitting the packet to the transmission destination address.

Abstract: A relay apparatus for performing relay possessing is disclosed. The relay apparatus includes a first logical relay unit; a second logical relay unit; a sending unit configured to add a packet header including a first protocol identifier or a second protocol identifier registered in a protocol assignment unit to a packet to be sent by the first logical relay unit or the second logical relay unit, and to send the packet to a network; a receiving unit configured to pass a received packet to the first logical relay unit or the second logical relay unit by referring to the protocol assignment unit based on a protocol identifier in a packet header of the received packet; and a switching process unit configured to change correspondence relationship for the first and the second protocol identifiers to switch between the first logical relay unit and the second logical relay unit.

Abstract: A home agent used in a mobile communications system conforming to Mobile IP is disclosed. A mobile node belongs to the home agent, and the home agent has a global IP address that is a home address common to a plurality of mobile nodes. The home agent includes: an interface unit configured to route a received packet according to a transfer table that includes a correspondence among a home address of the mobile node, a care of address of the mobile node, and a communication session identification number for identifying a communication session opened by an application of the mobile node, wherein a transfer destination of the received packet is identified by a combination of the care of address and the communication session identification number; and a location information management unit configured to manage the transfer table.

Abstract: A community control server stores in a community defining table, data of a correspondence between Interior Gateway Protocol (IGP) routers that are connected to a community and another community. The community control server collects prefix data that is included in routing information that is received by the IGP routers and identification data of the IGP routers. Based on the community defining table and the identification data, the community control server detects a community corresponding to a prefix. Upon receiving data of whether to transmit the routing information in the form of the permission to distribute them between communities, based on data of the community the community control server determines the prefix corresponding to the source community and transmits the prefix data to the IGP routers.

Abstract: A virtual interface having a global address of a physical interface on an Internet side of a gateway is provided in a terminal. An application unit of the terminal transmits a packet to the Internet using the virtual interface. The packet is transferred to the gateway through a downlink transfer path. The gateway transmits the packet from the physical interface on the Internet side to the Internet.

Abstract: At the time of exchanging routing information of a remote site, it is examined whether there is duplicated routing information, and when the duplicated routing information exists, an address conversion rule is generated. With this, when performing communication, address conversion is performed only for the communication to a site having a duplicated network address. In case of communication to a site having no duplicated network address, by performing IP communication intact, it becomes possible to omit unnecessary address conversion processing in a gateway. Also, when there is a duplicated address, by assigning a new network address which is not used in a site under a gateway to the duplicated address included in the routing information, and distributing the newly assigned address, it becomes possible to transmit a packet to a gateway appropriate to each destination, when there are a plurality of gateways in a subnet.

Abstract: A packet processing system includes a plurality of control devices and a packet forwarding device that operate as a single packet forwarding device, each of the control devices executing at least one application. The packet processing system transmits, when a destination of a packet specified by an application is within the packet processing system, the packet from the application to the destination directly without using the packet forwarding device.

Abstract: The hierarchical packet processing system comprises a relay unit and a server, which relay received packets. The relay unit comprises a call unit for calling up a prescribed service processing unit for performing the service process of a received packet, a first service processing unit for performing the service process of the received packet by the call of the call unit, a second service processing unit for performing a virtual service process of the received packet by the call of the call unit. The server comprises an external service processing unit for performing the arbitrary service process of the received packet instead of the second service processing unit when the call unit calls up the second service processing unit.

Abstract: A packet processing system including a forwarding apparatus that sends and receives a packet by using a network interface and a control apparatus that includes an application receiving the packet is provided. The control apparatus includes: a symbol part corresponding to the forwarding apparatus; and a transfer control part for sending a request message, to the forwarding apparatus, requesting the forwarding apparatus to set a packet transfer rule for transferring a receiving packet to the application; and the forwarding apparatus includes: a transfer control part for setting the packet transfer rule as requested by the request message; wherein the packet transfer rule includes an interface identifier corresponding to the communication port; and when the control apparatus detects that the interface identifier is changed, the control apparatus sends a correction message, to the forwarding apparatus, requesting the forwarding apparatus to correct the interface identifier in the packet transfer rule.

Abstract: In a network arrangement implementing a virtual interface scheme to execute various types of application processes using plural control units, the routing tables of the control units may be synchronized without having to execute a complicated process sequence. In a network apparatus including a forwarding unit corresponding to a base point for conducting packet transmission/reception with an external network, and plural control units for operating plural applications that are arranged to access virtual interfaces of the control units that correspond to actual interfaces of the forwarding unit so that the network apparatus appears from the outside to be functioning as a single unit. A routing process of generating a routing table is executed at a master control unit corresponding to one of the control units, and if the routing table of the master control unit is updated, a routing table of the forwarding unit is updated by a routing synchronization process that operates independently from the routing process.

Abstract: A relay system, comprises interface units for accessing networks, a domain definition module, an connection definition module, a routing module, an address translation module for translating, when forwarding a communication data from one domain to another domain, a source address belonging to the source domain contained in the packet into a proxy host address belonging to the routing destination domain, and an address reverse translation module for translating, when receiving a communication data which has the proxy host address in destination address field, the destination address belonging to the source domain contained in the packet into the address belonging to the routing destination, and a control unit for controlling a connectability for routing between the two or more domains in accordance with definitions of the connection definition module.

Abstract: A packet processing device in which a receiving buffer free space notifying portion notifies a free space of a receiving buffer, an accumulation condition determining portion determines a size of a big packet based on the free space, and a reassembly buffer processor reassembles a plurality of receiving packets into a single big packet to be transmitted to the receiving buffer. A backward packet inclusive information reading circuit for detecting the free space based on information within a backward packet from the upper layer may be used as the receiving buffer free space notifying portion. Also, an application layer may be used as the upper layer so that the big packet is transmitted not through a buffer of a transport layer but directly to the receiving buffer.

Abstract: Interface identifying information related to an individual processing device and forwarding information related to the processing device are received from the processing device, interface identifying information and forwarding information related to a processing device accessible on a network are retained, an access packet is received from a terminal that accesses the accessible processing device, access packet identifying information related to the access packet is compared with the interface identifying information and the forwarding information, the access packet is forwarded to the accessible processing device.

Abstract: A packet control system includes a packet forwarder and a packet control device. The packet forwarder includes a received packet transfer unit that transmits to the packet control device a routing information packet received from a network interface of the packet forwarder. The packet control device includes a virtual interface that has address information associated with the network interface; a transmitted packet reception unit; and a transmitted packet transfer unit. The transmitted packet reception unit receives the routing information packet, associates the routing information packet with the virtual interface, and transmits the routing information packet to the routing process. The transmitted packet transfer unit receives the routing information packet transmitted from the routing process, and transmits the routing information packet to the packet forwarder.