Kddi Corporation

Telcordia Technologies, Inc.

National Institute of Information and Communications Technology, Incorporated Administrative Agency

Ddi Corp.

Kddi R&d Laboratories, Inc.

Akira Idoue

Hidetoshi Yokota

Daisuke Arai

Ashutosh Dutta

Subir Das

Tsunehiko Chiba

Abhrajit Ghosh

Kyriakos Manousakis

Dana Chee

Kiyohito Yoshihara

Masugi Inoue

Hiroki Horiuchi

Khaled Mahmud

Toshihiko Kato

Shih-wei Li

Takeshi Kubo

Jun Endou

Kenji Hori

Funchun Joseph Lin

Takeshi Kouyama

Toru Hasegawa

Akio Ishikawa

John Lee

Joe Lin

Homare Murakami

Mikio Hasegawa

Naoki Imai

Osamu Kobayashi

Tomohiko Ogishi

Fuchun Joe Lin

Manabu Isomura

Fuchun Joesph Lin

Osamu Maeshima

Tsumehiko Chiba

Kazuyuki Tasaka

Riichiro Asaoka

Yasunobu Ono

Masaya Fujiwara

Wataru Uchikawa

Shih-Wei Li

A mechanism by which handoff delay can be minimized while not compromising the IMS/MMD security and also protecting the media if required by certain applications is presented. Methods for mitigating delay during SA re-association and mitigating the IPSec tunnel overhead for signaling and media at the Mobile Node are given. In one embodiment, SA keys can be transferred from the old P-CSCF to new P-CSCF, enabling the establishment of SAs before Mobile Node physically moves to the new subnet in a network. Proactive handover is used. In another embodiment, SA keys are transferred from S-CSCF to new P-CSCF. In this case, the SA keys are transferred to the new P-CSCF by S-CSCF through a context transfer mechanism well in advance so that SAs may be established before Mobile Node physically moves to new subnet. In another embodiment, methods for mitigating IPSec tunnel overhead are presented.

Security optimization for IMS/MMD architecture

A mechanism by which handoff delay can be minimized while not compromising the IMS/MMD security and also protecting the media if required by certain applications is presented. One proactive method includes proactive authentication. Another proactive method includes proactive security association, such as transferring SA keys from old proxy to new proxy, or transferring keys through serving signal entities. Reactive methods include transferring SA keys from old proxy to new proxy, using either push or pull technology. Other reactive methods include transferring keys through serving signal entities using either push or pull technology.

P-CSCF fast handoff for IMS/MMS architecture

A communication network system is disclosed in which local-branch-site-line network switches accommodating local-branch-site lines, and at least one data-center-site-line network switch accommodating at least one data-center-site line, are interconnected via a carrier network. This system include: a first bandwidth controller, disposed at each local-branch-site-line network switch, configured to limit a bandwidth of each of inbound packets and/or outbound packets to a pre-selected bandwidth &#x3b1;, wherein the inbound packets flow from the instant local-branch-site-line network switch or other local-branch-site-line network switches, and the outbound packets flow to the instant local-branch-site-line network switch or other local-branch-site-line network switches; and a second bandwidth controller, disposed at each local-branch-site-line network switch, configured to limit a bandwidth of each of inbound packets and/or outbound packets to a pre-selected bandwidth &#x3b2; broader than the bandwidth &#x3b1;, wherein the inbound packets flow from the data-center-site-line network switch, and the outbound packets flow to the data-center-site-line network switch.

Communication network system, network switch and bandwidth control, for site-to-site communications

A system and method for mobility support of a mobile node having a home network in a heterogeneous roaming environment is presented. The method comprises the steps of authenticating the mobile node in a visited network and obtaining an address for the mobile node in the visited network, establishing a security connection between a functional component in the visited network and an agent in the home network, creating a home address for the mobile node, and using the home address to generate a SIP signaling address, a SIP media address, and a non-SIP media address, such that SIP non-media is transmitted using the security connection to the SIP signaling address, SIP media is transmitted using the security connection to the SIP media address, and non-SIP media is transmitted using the security connection to the non-SIP media address.

Flexible mobility framework for heterogeneous roaming in next generation wireless networks

The present invention advantageously provides several systems and methods for solving the trombone routing issues within an IMS/MMD network. These approaches avoid trombone routing, speed up handoff, and increase the efficiency of signaling and overall performance of an IMS/MMD network. These solutions can broadly be divided into the following categories. Piggy-backing SIP registration over MIP (Split at FA); Selective Reverse Tunneling and Tunneling between FA and P-CSCF; the SIP-based mobility protocol; use of CoA during SIP registration and call up in MIPv6; Piggy-backing SIP registration when HA and S-CSCF Co-exist; Using Dynamic Home Agents in MIPv4 FA-CoA; and the Interceptor-Caching Approach.

Methods of mitigation of trombone routing in an IMS/MMD network

The present invention provides a network operations management method and apparatus which realizes efficient power-saving by enabling virtual servers to move between physical servers beyond network segments. A reallocation design unitdesigns reallocation of virtual servers to physical servers so that necessary resource amounts are assigned to all virtual servers. When virtual servers VS need to move between physical servers PS beyond network segments NS for the designed reallocation, a grouping unitchanges a network segment NS to which physical servers PS are connected by changing the configuration of a router and switches. A reallocation unitrealizes efficient power-saving by reallocating the virtual servers to the physical servers based on the design made by the reallocation design unit

Network operations management method and apparatus

A load balance server has a first database for recording a list of identifiers of the presence servers, a second database for recording a subscription message receiving rate, an entry retrieval means for selecting a presence server that the subscription message receiving rate is lowest, in presence servers included in the list of the entry based on the presence information, a presence server selecting means for selecting an additional presence server whichever subscription message receiving rate is lower than predetermined threshold Ts, when the subscription message receiving rate in the selected presence server is higher than predetermined threshold Ts, and a message sending/receiving control means for sending the public message to the selected presence server.

Load balance server and method for balancing load of presence information

The present invention provides a network configuration restoration method and system which can perform restoration by copying past configuration files in a short time. An updating judging unitjudges updating of each network device by comparing an acquired configuration file and a registered configuration file linked to a first identifier representing a copy timing. A new save unitacquires an updated configuration file from a network device, and links the updated configuration file to a first identifier and a second identifier which sets the current timing as a new save timing and saves it in a configuration file database. A save unitcopies a registered configuration file of a network device whose configuration file has not been updated and links it to a first identifier representing the copy timing and a second identifier linked to this configuration file and saves it.

Network configuration restoration method and system

In a network including equipment noncompliant to the topology management protocol, a message substitution response system executing substitution response to a message discovered or topology search message in lieu of the noncompliant equipment is provided. The substitution response module generation unitgenerates a substitution response module which responds to Discover message and topology search message in lieu of each of LLTD noncompliant equipment for every LLTD noncompliant equipment. The network simulation module generation unitgenerates a network simulation module for simulating message transmission on the home network. The substitution response functional unitsimulates message transmission between the home network and each of substitution response modules, and message transmission between each of substitution response modules by said network simulation module.

Message substitution response system

A switchhaving a tag VLAN function includes a plurality of physical ports P, P. . . , and adds an ID tag unique to each physical port to the header of a packet received by the physical port and sends the packet, and on the other hand, refers to an ID tag attached to a packet received from a GWand sends the packet to a physical port corresponding to the ID tag. The GWsearches for a server address corresponding to the ID tag attached to the packet received from the switchand modifies a destination address of the packet into the server address. In addition, the GWattaches an ID tag corresponding to a source address of the packet received from the shared serverto the received packet, and modifies the source address of the packet into a GW address.

Communication control method and system

A gateway (GW) and a plurality of foreign agents (FA) are connected in a ring-like manner, and the procedures of (1) the GW receiving an IP packet, addressed from a corresponding node CN to a mobile node MNa; (2) the GW transferring the packet to a link Lin one direction; (3) an FAtransferring the received packet to a link Lin the same direction; (4) FAfurthermore transferring the received packet to a link L, connected to MNa, if the destination address of the received packet is already registered in the visitor list; (5) an FAtransferring the received packet to a link Lin the same direction; (6) FAfurthermore ending the process as it is if the destination address of the received packet is not registered; and (7) the GW discarding the received packet.

Mobile network and communication method thereof

An administrator(2) registers configuration files of compliant equipmentand noncompliant equipmentand a configuration script into a management server, and (3) sends the network equipment to a user. When the userconstructs the local networkby connecting the network equipment and turns it on, (4) a configuration request message is transmitted from the compliant equipmentto the management server. (5) The management serverreplies with the configuration file of the compliant equipment, the configuration file of the noncompliant equipment, and the compliant script to the compliant equipmentin response to the configuration request. The compliant equipment(6) registers its own configuration file received from the management serverinto itself, and then (7) configures the configuration file of the noncompliant equipmentinto the noncompliant equipment by executing the received configuration script.

Network configuration method and system

A data communication method and apparatus for a mobile network. A destination foreign agent (FA) recognizes a MAC address of an MN. The FAregisters the MAC address of the MN in a handoff request message (FHReq), and the FAfeeds the FHReq onto a transfer network. Each of foreign agents (FAs) receives the FHReq, registers an IP address corresponding to the MAC address in the FHReq when the MAC address is registered in a binding list of the FAs themselves, and feeds the IP address onto the transfer network. The FAreceives the FHReq, and temporarily registers the MAC address and the IP address in the binding list of the FAitself. The FAtransfers data sent from a homw agent (HA) to the MN, based on the information which has been temporarily registered.

Mobile network, and data communication method therefor

The present invention provide a method for call establishment over a packet exchange network which is capable of saving the time required for a call establishment of the PPP by reducing redundant steps for authentication in a SIP call, and to reduce the incoming data amount. The present invention comprising the following steps. Step (a): The TE requests the PDSN for CHAP authentication. This message is received by the AT on behalf of the PDSN. Step (b): The AT requests the TE for the CHAP authentication on behalf of the PDSN, and the maximum packet size MRU receivable by the PTSN is transmitted to the TE. Step (c): The AT accepts the CHAP authentication on behalf of the PDSN. Step (d): The TE accepts the CHAP authentication and the MRU of the PDSN. This message is also received by the AT on behalf of the PDSN.

Method for call establishment over a packet exchange network

Growing community of inventors

Saitama, Japan

Akira Idoue