Hitachi, Ltd.

Hitachi Communication Technologies, Ltd.

Takehiro Morishige

Yukiko Takeda

Hidenori Inouchi

Koji Tanaka

Masashi Yano

Hitomi Nakamura

Koh Ohnishi

Toshiaki Suzuki

Masahiro Takatori

Toshio Hirosawa

Satoshi Yoshizawa

Koji Wakayama

Seishi Hanaoka

Fumio Noda

Yusuke Hara

Atsushi Ueoka

Daisuke Yokota

Naruhito Nakahara

Yoshihiro Shimizu

Norihisa Matsumoto

Junji Yamamoto

Minoru Hidaka

Tsutomu Ito

Tohru Setoyama

Go Ono

Mariko Yamada

Katsunori Takahashi

Ryouji Yamaoka

Kiyoshi Ichikawa

Masashi Takatsuki

Jousuke Matsuki

Kenichiro Tomizawa

Yutaka Nara

In order to provide a redundancy configuration to an access gateway apparatus in which a control plane and a user plane are separated, the access gateway apparatus includes: a control computer for receiving control signals from the networks to establish the communication path, thereby determining packet transfer information for the data; and a transfer computer for receiving the packet transfer information from the control computer to transfer the data through the communication path. The transfer computer includes: a plurality of first transfer computers for executing the transfer of the data; and a second transfer computer for taking over, when a fault occurs in any one of the plurality of first transfer computers. The control computer includes: a first control computer for processing the control signals received from the networks; and a second control computer for taking over, when a fault occurs in the first control computer.

Control method for access gateway and communication system

(Problems) By assigning a fixed home address to an MN, Mobile IPv6 assures the arrival of each content at the MN. In order to allow the user to receive a Mobile IPv6 service, it is necessary to provide the MNwith a Mobile IPv6 function for making applications conform to IPv6. However, there are only few such MNs. In addition, the MNdoes not have a function for implementing an IPsec process repeatedly on a packet transmitted to and received from another apparatus. (technical solution) A scenario processing portemployed in the MNincludes a means, which is used for selecting a process according to a communication method and carrying out the selected process when a response to a Mobile IPv6 location registration message is received. By providing the scenario processing portwith a means for selecting a communication method, a function can be added to the MNwith ease. In addition, by providing the MNwith a means for implementing an IPsec process a plurality of times, it is possible to provide a communication apparatus according to a security management configuration.

Terminal and communication system

It is provided a mobile communication system comprising base stations, call control servers and access gateways. The call control servers cause a mobile terminal accommodated in one of the control server to transmit the location registration request so that the mobile terminal accommodates in another control server according to a processing amount of control signals. The base station selects a second call control server into which the one of the mobile terminals is to be newly accommodated. The one of the call control server switches to a power-saving state after the mobile terminal is accommodated into the another call control server.

Mobile communication system for low power consumption, call control server and access gateway

To prevent a hung-up of communications due to changes in a radio wave condition resulting from frequent displacement of the terminals and changes in a number of the terminals, and to realize switching of the radio systems adapting to the radio condition. A radio communication system comprising: a base station for providing a plurality of radio systems, and terminals for communicating with the base station through the plurality of radio systems. The base station decides a priority of the radio system on which the each terminal will communicate thereafter and transmits paging signals of one of the plurality of radio systems which includes information on the decided priority to the each terminal.

Cognitive wireless communication system

Disclosed herewith is a communication system, which can solve the following conventional problem that if packets exchanged between a terminal and an HA are encapsulated with use of the mobile IPv6 protocol, the PDSN cannot identify any IP flows in the mobile IPv6 tunnel. Consequently, there is no QoS usable appropriately to the services in the EV-D0 RAN. To solve such a problem, the PCRF notifies the HA of the filter information used to specify each IP flow and the flow label assigned to each IP flow. The HA then sets the flow label in the outer IPv6 header of the packet matching with the filter information and transfers the packet to the object unit. The PDSN then refers to the flow label set in the outer IPv6 header to identify the object IP flow in the mobile IPv6 tunnel. Consequently, a proper QoS can be usable for the services respectively in the EV-D0 RAN.

Communication system, server, control apparatus and communication apparatus

With a system having no paging function, dead peer detection control and cutoff of a session are implemented as is the case with a system having a paging function. There is provided a method for dead peer detection of a mobile terminal, to be executed in a mobile communications system including a mobile terminal connected to plural wireless systems, a first connection device terminating a first wireless system with access points managing a connection status between the mobile terminal and a wireless link, and a second connection device terminating a second wireless system with access points not managing a connection status between the mobile terminal and a wireless link, said method comprising the steps of the second connection device acquiring the connection status of the mobile terminal in the first wireless system from the first connection device, and the second connection device changing a dead peer detection control process on the basis of the connection status of the mobile terminal, as acquired.

Mobile communications system PDIF and method for peer detection of mobile terminal

A packet sent in a mobile IP communication between different regions passes through a particular address translation unit, so that the communication route cannot be optimized. The packet cannot be delivered to a mobile node not having a fixed home address. To overcome the difficulties, the address translation unit includes a function to process the mobile IPv6 protocol. The mobile node includes a function to dynamically acquire a home address. A first network and a second network each identify the mobile node by a SIP (session initiation protocol) identifier. The mobile node acquires a home address on the second network and registers a corresponding relation between the identifiers and the home address thereof. A terminal on the second network acquires the home address of the mobile node from information of the mobile node registered to the SIP server according to a SIP procedure.

Address translation equipment, terminal equipment and mobile communication method

Security policy databases capable of being fast retrieved while securing sequentiality. An IPSec processing device of the present invention performs communications by encrypting IP packets exchanged between a first IP network and a second IP network. The IPSec processing device includes a security policy database that stores security policies. The security policy database includes first, second, and third security policy databases. The first and third security policy databases include a linear list structure, and the second security policy database includes a hash list structure. The IPSec processing device, when performing at least one of transmission and reception of the IP packet, retrieves a security policy in the order of the first, second, and third security policy databases.

IPSec processing device, network system, and IPSec processing program

Since, in Mobile IP, the correspondence of one Mobile Node home address and a care-of address is assumed to be one to one, it is not possible to associate multiple care-of addresses with one home addresses, select an appropriate care-of address from among these and dynamically modify the forwarding destination. In the invention, the binding update sent by the Mobile Node to the Home Agent is extended in order to make it possible to also report the application ID at the same time. The Home Agent selects an appropriate care-of address, based on the application ID.

Mobile node, server, and communication system

Mobile terminals have the problem of large packet loss during movement because the mobile terminal has no opportunity to detect movement and generate a new care-of address until a new router advertisement is received, and also cannot register the position in the home agent. The present invention is characterized in including a means to automatically collect network information on access router devices in the vicinity of a particular access router device, and a means to send information in the router advertisement including information on at least one or more adjacent access router devices. The mobile terminal selects an access router device to become the next movement destination, and the most essential characteristic is a means to register the position information beforehand in the home agent.

Communication system, server, router, and mobile communications terminal

In a Web information preferential transfer system, two priorities, personal priority and site priority can be set on the site of a user. On the site of a user, the site priority which can be set by a LAN-side proxy server is the priority of when a request is made. A WAN-side proxy server installed on the provider side extracts the site priority of the request, converts it to the final priority according to the communication state and settings, converts the final priority to a preferential control parameter of an IP packet of a Web object in response to the Web request, and relays it to the LAN-side proxy server. Preferential control may be made based on the final priority in the WAN-side proxy server. Charging by the provider is performed based on the communication contents used and the requested priority.

Web information preferential transfer system

A method and apparatus are provided for mobile communication utilizing load balancing. When a home agent (HA) consists of one or more servers with each server being assigned a Mobile IPv6 Home-Agents Anycast Address, a nearby router does not store the link-layer addresses with respect to the Anycast addresses of the servers in its neighbor cache. Consequently, load balancing between or among the servers could not be performed. To solve this problem, in one example, an HA is provided that comprises a representative HA and distributed HAs. The representative HA is assigned an Anycast Address. The representative HA includes a collecting device configured to collect HA lists and load information from the distributed HAs. The representative HA dynamically creates a HA list and sends the HA list to a mobile node (MN). The MN registers its current location with an HA from the HA list included in a Home Agent Address Discovery Reply message. The load on the HA can then be shared by the servers constituting the HA.

Method and apparatus for mobile communication utilizing load balancing

A mobile terminal having a packet communication function according to a mobile IP and a communication route optimizing function includes a session controller for setting a session between terminals in accordance with a session control message of a protocol different from the mobile IP. When a session control message from the other party is received in a visited mobile IP network, the session controller executes optimization of a communication route to the other party by the communication route optimizing function before transmitting a response for the received message.

Mobile terminal equipment and packet communication method between terminals

Since the Mobile IP is defined under the assumption that a mobile node roams between networks conforming to the same communications protocols, mobile communications between IPv4 and IPv6 are not possible. Further, a translation of the location registration messages also requires translating the format between different protocol layers. To solve this problem, a mobile proxy apparatusis provided between a home networkand a foreign networkgoverned by different communications protocols. The mobile proxy apparatushas a DNS-ALG function, a translator function and a Mobile IP function, and, by combining these functions, performs address translation and format translation on Mobile IP messages and user packets. The MN4 has Mobile IPv4 and Mobile IPv6 functions and executes communication suitable for the communications protocol governing the network to which it moves.

System using mobile proxy for intercepting mobile IP message and performing protocol translation to support multiple communication protocols between mobile networks

Growing community of inventors

Hachioji, Japan

Takehiro Morishige