Abstract: Disclosed is a technique to eliminate wasted tunneling encapsulation processing during redirection of a packet. According to the technique, when a packet of a first connection passing through a LMA 111 and a MAG 121 using a first address of an interface 131 of a MN 130 is redirected to a second connection passing through a LMA 112 and a MAG 122 using a second address of an interface 132 of the MN 130, a redirection tunnel T1 is established between the LMA 111 and the LMA 112. When the MAG 122 knows the first address, the LMA 112 encapsulates a packet addressed to the first address that is redirected via the tunnel T to be addressed to the MAG 122 for transferring.

Abstract: Disclosed is a technique for allowing a mobility service provider to allocate a home agent appropriate for each individual mobile node. According to the technique, an MN 10 notifies the domain name of an MSP 3 to an ASP 1, and in response to the notified domain name of the MSP, the ASP notifies the address of an HA allocation server 3a to the MN. The MN transmits, to the notified address of the HA allocation server, an HA allocation request message including the domain name of the ASP. The HA allocation server selects an HA based on previously held correspondences between HAs 3b, 3c and one or more ASPs, and notifies the selected HA to the MN.

Abstract: A User Equipment (UE) that is simultaneously connected (via a 3G connection and a non-3G connection) to a Packet Data Network Gateway (P-GW) can direct how traffic flows would be routed from the P-GW to the UE. Typically, the P-GW would setup the 3G communication path to the UE when it receives a downlink data packet directed to the UE's 3G path. If the P-GW uses such logic for setting a communication path to the UE without knowing the user's actual intention, this might result in the case where the user would experience some service degradation for ongoing session. In addition, it is possible that the packets filters for a first UE interface are not utilized due to the erroneous setting of the packets filters for a second UE interface. To resolve this issue, the UE would indicate to the P-GW of the user's intention for communication path setup with the benefit of conserving the UE's battery.

Abstract: A technology is disclosed for preventing packet and transferring packets to a switched interface with minimal delay, when a mobile node switches a using interface. According to the technology, when a MN 200 is communicating with a MAG (WLAN) 232, a PBU message 301 has already been transmitted from the MAG (WLAN) 232 to the LMA 220, and binding related to a WLAN connection 242 is already registered in the LMA 220. When an interface switching event 300 is generated, the MN 200 transmits to the MAG (WLAN) 232 via the WLAN connection 242, a binding in-advance registration message 302 for registering a binding in advance. When the MAG (WLAN) 232 detects disconnection 310 of the WLAN connection 242, the MAG (WLAN) 232 transmits a registration delete/trigger message 312a to the LMA 220, registers and triggers in the LMA 220 the in-advance registration binding registered in the MAG (WLAN) 232, and deletes the PBU message 301.

Abstract: Disclosed in a technique for registering, with a home agent, a routing rule for specifying packets destined to a second address generated from a home prefix as well as a home address and/or flow destination interfaces without increasing the number of messages. According to this technique, when a UE 10 is communicating (flow 1 and flow 2) with a CN 17 using the HoA, a routing rule indicating, for example, that flow 1 of packets destined to a HNP address is forwarded to a 3GPP interface IF1 and flow 2 of packets destined to the HNP address is forwarded to a WLAN interface IF2 is registered with a P-GW 13 through a routing rule registration message 21 such as a BU message at the time of starting simultaneous connections of the interfaces IF1 and IF2.

Abstract: Disclosed is a technique in which when mobile terminal having multiple communication interfaces attaches to an access network, the mobile terminal can connect to a desired PGW quickly in a short time even if a PGW different from the desired PGW is allocated. According to the technique, when a mobile terminal (UE) 1 performs bootstrapping (BS) processing on an access network (N3G access (3)), the address of another communication interface (home prefix) already connected to the desired PGW (T-PGW?5b) is notified to a connection destination PGW (I-PGW 5a). If the I-PGW does not manage the address, processing is so performed that BS processing will be started from the T-PGW managing the address to the mobile terminal. Further, if the mobile terminal is connected to an I-PGW undesired on the N3G access, a request is made for reuse of a key exchanged with the I-PGW upon switching the connection from the I-PGW to the desired T-PGW.

Abstract: A mobility condition determination unit, provided in an MIP controller that manages moving of a communication node, obtains and examines various conditions that have occurred as the communication node is moving, selects an appropriate HoA (e.g., the home address of an MN1) for the current connection situation, and transmits, to a multihoming controller, a notification indicating that a set of the selected HoA and a CoA constitutes appropriate addresses to be used. Upon receiving the notification from the mobility condition determination unit, the multihoming controller transmits, to the MIP controller, an address (Addr2) consonant with the received HoA, and the MIP controller performs packet communication using the HoA or the CoA consonant with the address.

Abstract: Disclosed is technique for avoiding packet reflection between home agents. According to the technique, a MN 10 includes a home address (HoA1) assigned thereto from a home network 12, and a home address (HoA2) assigned thereto from a home network 14. CoA is further acquired from a foreign network 15. Then, the MN uses the home addresses as care-of addresses, and performs binding-update including HoA1-HoA2 for the HA 12 and binding-update including HoA2-HoA1 as well as HoA2-CoA for the HA 14. A packet transmitted from a CN 16 to HoA1 is encapsulated by the HA 12 and transferred to the HA 14. The HA 14 refers to a source address of the received encapsulated packet and selects CoA as a transfer destination address instead of HoA2 having the same prefix.

Abstract: Disclosed is a technique to allow a network operator of a mobile node to securely reject an unfavorable address for use in route optimization. According to the technique, when receiving a HoTI message 40 (Step S1), a HA 30 checks whether a sender address CoA of an external IP header 41 is a registered CoA or not (Step S2), and when it is not a registered CoA, the HA 30 discards the HoTI message 40 (Step S3). When it is a registered CoA, the HA 30 checks whether CoA1 in a CoA option 46 is OK for route optimization or not (Step S4). When it is OK for route optimization, the HA 30 transfers a decapsulated HoTI message 42 to a CN 20 (Step S5). On the other hand, when it is not OK for route optimization, the HA 30 discards the HoTI message 40 (Step S3).

Abstract: A technique is disclosed whereby a mobile communication apparatus (MN) having a plurality of interfaces (IFs) performs fast handovers (FMIP) and changes a packet transfer destination using its own multiple IFs, so that packet transmission/reception using an appropriate IF for the MN is enabled. According to this technique, an MN 10 transmits, to an access router (AR) 21, an FBU message that includes, as an packet transfer destination used during a period in which the FMIP is performed for the handover from an access point (AP) 22 to an AP 32, an address that is allocated to an IF currently connected to the AP 12, and notifies the AR 21 to that effect. After the handover has been completed, the packet transfer destination is changed to the IF that is re-connected.

Abstract: Disclosed is a technique in which, when respective addresses of multiple interfaces of a mobile node are registered with a mobile management device, a delay in transmission of packets destined to addresses other than the source address of a bulk registration message is prevented. According to the technique, an MN 100 uses each of addresses associated with IFs 1000 and 1001 as a source address, respectively, to send a HA 101 an individual registration BU message S30, S31 for registering the source address individually. When receiving the individual registration BU message S30, S31, the HA 101 registers the source address as having been verified through ingress filtering of a foreign network domain 11, and sends a BA message S32, S33 to authorize bulk registration for updating the respective addresses in bulk.

Abstract: The present invention discloses a technique to bind home address of a mobile node to prefixes assigned to a mobile node having a plurality of interfaces, and the present invention reduces number of binding update messages and a packet size. According to this technique, length (e.g. 64 bits) of an original prefix P1 is extended by one bit and lower-level prefixes P11 and P12 with 65 bits each are generated, and by extending the length of the lower-level prefix P12 with 65 bits by one bit, lower-level prefixes P121 and P122 each with 66 bits are generated, and the lower-level prefixes P11, P121 and P122 are assigned to interfaces IF1, IF2 and IF3 of MN 200 respectively.

Abstract: The invention provides a technique to reduce a packet size of signaling to request vertical handoff in case a mobile node has static vertical handoff rules. According to this technique, MN 500, which has an If1, a WiMAX If2 and a WLAN If3, each being communicable with a PMIPv6 domain 511, roams within the PMIPv6 domain 511, and when the WiMAX If2 or the WLAN If3 is selectively and newly connected to WiMAX or WLAN, a prefix P2 to uniquely transfer the prefix P1 relating to If1 without transferring the prefix P1 relating to If1 to the WiMAX-If2 and the WLAN-If3, and to uniquely transfer from the WiMAX If2 previously connected or the WLAN If3 previously connected to the WiMAX If2 or the WLAN If3 newly connected to the LMA/HA 512 so that ID's of If2 and If3 are not contained in a trigger message of the vertical handoff as transmitted by MN 500.

Abstract: Disclosed is a technique to, when a mobile node including a plurality of interfaces roams in a home domain, reduce signaling to create a client-based binding cache in a home agent and manages the same. When a MN (10) refers to a home MIPv6 prefix (P1) via an interface (If1) to find attachment to a home MIPv6 domain, the MN (10) predicts a high probability that another WLAN interface (If2) of the MN (10) connects with the same home MIPv6 domain (100) and an LMA/HA (40) and transmits a CMIPv6 cache creation•maintenance/management request message (308) to the LMA/HA (40). Receiving the request message (308), the LMA/HA (40) creates a CMIPv6 cache relating to the PMIPv6 cache of the WLAN interface (If2) and maintains/manages the CMIPv6 cache without being refreshed by the MN (10).

Abstract: A technology is disclosed for providing a mobile terminal that can prevent occurrence of packet loss and prevent communication delay. Based on the technology, the mobile terminal performs packet communication via a communication network with a communication terminal that is a communication partner of the mobile terminal, using a binding cache including address information of the communication terminal.

Abstract: Disclosed is a technique to reduce the number of messages to register mobile node position information with a home agent when a mobile node roams into a foreign network domain having a roaming relationship with a home network domain. Upon reception of network information 40, when the network information 40 contains a foreign prefix, a MN 11 creates a care-of address (CoA) using the foreign prefix (Step S44). The MN 11 further checks whether the network information 40 contains a home prefix (Step S45). When no home prefix is included in the prefix 203, a BU message is transmitted to a home MAP 1000 (Step S46). When a home prefix exists in the prefix 203, the BU message is not transmitted to the home MAP 1000 (Step S47).

Abstract: Disclosed is a technique for achieving reduction in processing load caused when a mobile terminal having two or more interfaces registers flow control information with a network and reduction in traffic of signaling for the registration. According to this technique, a mobile terminal (MN100) has two or more interfaces (IF1 and IF2), registers, with a home agent (HA200), binding information between care-of addresses (CoA1 and CoA2) assigned to each interface and a home address (HoA0) of the MN, and further acquires home addresses (HoA1 and HoA2) exclusively for each interface and to be set for the interface and registers, with the HA, binding information between the HoA exclusively for each interface and a CoA corresponding to the HoA. For a flow desired to be sent and received by using only a specific interface, the HoA and CoA exclusively for the interface are used.

Abstract: The invention discloses a technique, by which the number of messages can be decreased when RR (Return Routability) procedure is performed to give authentication between a mobile node (MN) and a correspondent node (CN). According to this technique, CN 3 receives a plurality of CoTi messages transmitted from each of a plurality of interfaces of MN 1, generates a signature token for each of a plurality of care-of addresses, and transmits the signature token in each of a plurality of CoT messages to MN. Then, MN generates a common key for a plurality of care-of addresses by using each signature token of said plurality of CoT messages, generates a common authentication code for said plurality of care-of addresses by using said common key, transmits a bulk binding update message containing said plurality of care-of addresses and the common authentication code to CN. CN authenticates the common authentication code for said plurality of care-of addresses in the bulk binding update message.

Abstract: Disclosed is a technique for switching a forwarding address of a packet destined for a mobile node in a local mobility domain when the mobile node has a plurality of interfaces so that the packet will be forwarded to the mobile node. According to the technique, an MN 101 receives network information 40 including a domain ID 402 from a network through two or more IFs 1010 and 1011. Based on the domain ID 402 in the network information received, when determining that the IFs 1010 and 1011 are attached to the same domain, the MN 101 decides to allocate the same address to the IFs 1010 and 1011, and requests MAGs 111 and 112 connected to the IFs 1010 and 1011, respectively, to bind the same address to each of link identifiers of the IFs 1010 and 1011. Based on the request, the MAGs 111 and 112 perform binding to forward, to the MN 101, packets destined to the same address of the MN 101.

Abstract: The present invention provides a new technique, according to which a mobile router can fulfill functions as a dynamic home agent, in a system where a plurality of mobile routers are in operation, under the management of a service provider belonging to the home agent. According to this technique, the home agent verifies the legitimacy of the mobile router when it receives a Query message and a binding update message requesting permission to fulfill functions as dynamic home agent. Then, after confirming that no other mobile router is currently present, which is fulfilling the functions as dynamic home agent in a set of a plurality of mobile routers, to which this mobile router belongs, it allows said mobile router to operate as the dynamic home agent.