Abstract: A packet communication system having a wireless terminal, a plurality of wireless access networks, and a packet communication device connected to the respective wireless access networks, that includes a unit controlling handover processing for handover of the wireless terminal to a different wireless access network. Also included is a unit checking whether a handover destination wireless access network supports a header compression or decompression method used in a first packet communication performed through a handover source wireless access network, at a time of the handover. Also included is a unit controlling an execution point for processing corresponding to the header compression or decompression method to be specified at the packet communication device for a second packet communication performed through the handover destination wireless access network, when the above network does not support the method.

Abstract: A first communication terminal attaches information to be used to recognize whether or not header decompression processing is required and to recognize a forwarding route to a second communication terminal, to compressed data obtained through compressing a header of original data destined for the second communication terminal, and sends the compressed data to the network. Upon receipt of the compressed data, a data forwarding unit in a network recognizes, based on the information, whether or not the compressed data requires the header decompression processing and the forwarding route, and sends, if the compressed data does not require the header decompression process, the compressed data to the recognized forwarding route without decompressing the header.

Abstract: A base station relays communication between a wide area communications network and a mobile terminal in a nearby wireless area, and includes a storage device storing correspondence information that correlates a first address and a second address that are assigned to the mobile terminal, the first address being for a mobile communications network coupled to the wide area communications network and the second address being for the wireless area; a first communication interface that receives from the wide area communications network, a packet addressed to the second address; a processor that based on the correspondence information, converts the destination of the received packet, from the second address to the first address; and a second communication interface that transfers to the mobile communications network, the packet of which the destination has been converted, if the mobile terminal has performed handover to a second base station in the mobile communications network.

Abstract: A setting information distribution apparatus belonging to a first network, comprises: authentication unit that receives and authenticates an authentication request from a user terminal which requires an access authentication by using a network access authentication procedure between the user terminal and the first network; transmitting unit that transmits an authentication cooperation request which requires setting data to be set to the user terminal to another, network by using the network access authentication procedure and an authentication cooperation procedure between a plurality of networks; and distribution unit that distributes a first response message added with setting data to the user terminal by producing the first response message corresponding to the authentication request by adding the setting data included in a second response message corresponding to the authentication cooperation request.

Abstract: A first communication terminal attaches information to be used to recognize whether or not header decompression processing is required and to recognize a forwarding route to a second communication terminal, to compressed data obtained through compressing a header of original data destined for the second communication terminal, and sends the compressed data to the network. Upon receipt of the compressed data, a data forwarding unit in a network recognizes, based on the information, whether or not the compressed data requires the header decompression processing and the forwarding route, and sends, if the compressed data does not require the header decompression process, the compressed data to the recognized forwarding route without decompressing the header.

Abstract: A packet communication system having a wireless terminal, a plurality of wireless access networks, and a packet communication device connected to the respective wireless access networks, that includes a unit controlling handover processing for handover of the wireless terminal to a different wireless access network. Also included is a unit checking whether a handover destination wireless access network supports a header compression or decompression method used in a first packet communication performed through a handover source wireless access network, at a time of the handover. Also included is a unit controlling an execution point for processing corresponding to the header compression or decompression method to be specified at the packet communication device for a second packet communication performed through the handover destination wireless access network, when the above network does not support the method.

Abstract: To speed up a handshake of mutual authentication conforming to a TLS protocol at the time when a session is not established. An authentication method includes notifying, when an electronic certificate of an authentication partner is stored in a storage area of an authentication terminal apparatus, the authentication partner of a possession state of the electronic certificate in a handshake of mutual authentication conforming to a TLS protocol before session establishment; and causing the authentication partner to omit transmission of the electronic certificate.

Abstract: A network system is disclosed that comprises an access point that relays communication between a client and a LAN; and an authenticating server that authenticate an access of the client through the access point, wherein the authenticating server comprises a judging unit that judges the application state of a security program in the client that tries to connect with the LAN through the access point and notifies the client of the result of the judgment; and a data providing unit that provides data necessary for updating the application state to the client according to the result of the judgment and in response to a request of the client.

Abstract: A setting information distribution apparatus belonging to a first network, comprises: authentication unit that receives and authenticates an authentication request from a user terminal which requires an access authentication by using a network access authentication procedure between the user terminal and the first network; transmitting unit that transmits an authentication cooperation request which requires setting data to be set to the user terminal to another, network by using the network access authentication procedure and an authentication cooperation procedure between a plurality of networks; and distribution unit that distributes a first response message added with setting data to the user terminal by producing the first response message corresponding to the authentication request by adding the setting data included in a second response message corresponding to the authentication cooperation request.

Abstract: A setting information distribution apparatus belonging to a network, comprises: authentication unit that accepts and authenticates an authentication request given from a user terminal requesting access authentication by use of a network access authentication procedure between a user terminal and the network; collection unit that collects setting data to be set in the user terminal from a second device belonging to the network; and distribution unit that adds the setting data collected by the collection step to a response message corresponding to the authentication request, and distributes to the user terminal the response message to which the setting data is added.