Kddi Corporation

Telcordia Technologies, Inc.

National Institute of Information and Communications Technology, Incorporated Administrative Agency

Hidetoshi Yokota

Akira Idoue

Ashutosh Dutta

Subir Das

Tsunehiko Chiba

Dana Chee

Abhrajit Ghosh

Kyriakos Manousakis

Masugi Inoue

Khaled Mahmud

Shih-wei Li

Takeshi Kubo

Funchun Joseph Lin

Kazuo Hashimoto

Shu Yamamoto

Toru Hasegawa

John Lee

Joe Lin

Homare Murakami

Carl Edward Williams

Mikio Hasegawa

Osamu Kobayashi

Fuchun Joseph Lin

Fuchun Joe Lin

Fuchun Joesph Lin

Funchun Joe Lin

Tsumehiko Chiba

Satoshi Komorita

Ming Lai

Christian Makaya

Shih-Wei Li

A self-organizing IP multimedia subsystem exhibiting node splitting and node merging functions wherein any node within the self organizing IP multimedia subsystem may assume any role thereby providing node balancing and fault tolerance to an overall network.

Self organizing IP multimedia subsystem

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 system and method for route optimization in PMIP having a first mobile node having a local mobility anchor and anchored at an access router and a second mobile node anchored at an access router is presented. The method includes establishing a binding cache at one access router comprising a mapping of mobile node addresses to access router addresses, populating the binding cache, and updating the mapping of the mobile node addresses in response to a handoff of a mobile node from one access router to another access router, so that a packet is transmitted from the first mobile node to the second mobile node using the mapping in the binding cache. The second access router address is obtained by either transmitting the packet from the first mobile node to the local mobility anchor, or querying neighboring access routers, or broadcasting access router addresses from the local mobility anchor.

Proxy mobile IP

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

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

A mobile IPv6 dual-stack node engages in IPv6 communication while roaming within an IPv4-only network, for example using ISATAP. First, the node determines that it has moved Bnd obtains a new IPv4 address. After determining that the visited network contains no IPv6-enabled components, the node uses an IPv6 connect agent to engage in IPv6 communication. The node configures its care-of address using the IPv6 connect agent's routing information and the node's newly-obtained IPv4 address. In one embodiment, the node and the connect agent optimize the handoff when the nodes has moved but still uses the same connect agent. The node sends a binding updates to the connect agents comprising the node's old care-of address and the node's new care-of address. When the connect agent receives a packet destined for the node's previous care-of address, it forwards the packet to the node's currents care-of address, thereby reducing packet loss.

Enabling mobile IPv6 communication over a network containing IPv4 components using ISATAP

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

According to the present invention, there is provided a data transfer system using mobile IP in which transfer interruption is not caused even if an MH moves between FNs. A MAC bridge connected between FNs includes means responsive to an address registration request issued by an AP, for storing a combination of a MAC address of the MH and a receiving port, in a filtering DB; means for registering a relation of association of an address of a terminal accommodated in an FN with a connection port of an FN in which the terminal is accommodated, in the filtering DB; and means for referring to the filtering DB on the basis of the destination address of a frame input to each port, and transferring the frame to a predetermined port on the basis of a relation of association of the address with a port identifier.

Data transfer system using mobile IP

A mobile host MH and its home network HN correspond to both the Internet Protocol version 4 (IPv4) and the Internet Protocol version 6 (IPv6). An authentication server (RS) is accommodated in the home network HN. A corresponding host H corresponds to the IPv6 and is accommodated in the IPv6 network. In addition, a plurality of relay servers S, Sand Scorresponding to both the IPv4 and the IPv6 are accommodated in the IPv6 network. The respective S, Sand Sextract an IPv6 packet by decapsulating the IPv4 packet received from the mobile host MH via the IPv4 network, and transfers the relevant IPv6 packet to the corresponding host H via the IPv6 network.

Growing community of inventors

Saitama, Japan

Hidetoshi Yokota