US20110149839A1 - Communication system using network base ip mobility protocol, control apparatus, router and communication method thereof - Google Patents

Communication system using network base ip mobility protocol, control apparatus, router and communication method thereof Download PDF

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Publication number
US20110149839A1
US20110149839A1 US12/440,181 US44018107A US2011149839A1 US 20110149839 A1 US20110149839 A1 US 20110149839A1 US 44018107 A US44018107 A US 44018107A US 2011149839 A1 US2011149839 A1 US 2011149839A1
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Prior art keywords
router
mobile terminal
communication
notification
control apparatus
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US12/440,181
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English (en)
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Suguru Toyokawa
Masafumi Aramoto
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Sharp Corp
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Sharp Corp
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Assigned to SHARP KABUSHIKI KAISHA reassignment SHARP KABUSHIKI KAISHA ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ARAMOTO, MASAFUMI, TOYOKAWA, SUGURU
Publication of US20110149839A1 publication Critical patent/US20110149839A1/en
Priority to US14/630,355 priority Critical patent/US20150172960A1/en
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/0005—Control or signalling for completing the hand-off
    • H04W36/0011—Control or signalling for completing the hand-off for data sessions of end-to-end connection
    • H04W36/0016—Hand-off preparation specially adapted for end-to-end data sessions
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L12/00—Data switching networks
    • H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/14—Relay systems
    • H04B7/15—Active relay systems
    • H04B7/155—Ground-based stations
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W8/00—Network data management
    • H04W8/02—Processing of mobility data, e.g. registration information at HLR [Home Location Register] or VLR [Visitor Location Register]; Transfer of mobility data, e.g. between HLR, VLR or external networks
    • H04W8/08—Mobility data transfer
    • H04W8/087—Mobility data transfer for preserving data network PoA address despite hand-offs
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/02—Terminal devices
    • H04W88/04—Terminal devices adapted for relaying to or from another terminal or user
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/02—Buffering or recovering information during reselection ; Modification of the traffic flow during hand-off
    • H04W36/023—Buffering or recovering information during reselection
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W36/00—Hand-off or reselection arrangements
    • H04W36/24—Reselection being triggered by specific parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W40/00—Communication routing or communication path finding
    • H04W40/24—Connectivity information management, e.g. connectivity discovery or connectivity update
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W80/00—Wireless network protocols or protocol adaptations to wireless operation
    • H04W80/04—Network layer protocols, e.g. mobile IP [Internet Protocol]

Definitions

  • the present invention relates to a communication technology using a network base IP mobility protocol.
  • the Mobile IP is a protocol of a network layer which is a third layer of the OSI (Open Systems Interconnection) Basic Reference Model established by the ISO (International Organization for Standardization), and is a technology for hiding movement of a client (switch of a network/communication medium, short break and the like) from higher-order applications so as to continue communication.
  • OSI Open Systems Interconnection
  • ISO International Organization for Standardization
  • TCP/IP Transmission Control Protocol/Internet Protocol
  • IP address serves as an identifier and also shows a location on a network at the same time. Therefore, when a node connected to a certain network is reconnected to another network, an IP address thereof is changed and session is impossible to continue.
  • the Mobile IP provides a mechanism in which a unique address is assigned to a node and replaced with an IP address actually used in a TCP/IP stack, thereby it seems for upper layers or a communication partner that communication is performed with the assigned unique address in any network (for example, see Non-Patent Literature 1).
  • the Mobile IP is configured by nodes called a mobile node (Mobile Node, a mobile terminal, hereinafter, referred to as “MN”), a home agent (Home Agent, hereinafter, referred to as “HA”), and a correspondent node (Correspondent Node, a correspondent node, hereinafter, referred to as “CN”).
  • MN Mobile Node
  • HA Home Agent
  • CN correspondent node
  • the MN has an always invariable address called a home address (Home Address, hereinafter, referred to as “HoA”), and a node that manages the address is the HA.
  • HoA Home Address
  • a care-of address Care-of-Address, a care-of address, hereinafter, referred to as “CoA”
  • RA Router Advertisement
  • DHCP Dynamic Host Configuration Protocol
  • the HoA is an address of a link managed by the HA and is therefore temporally delivered to the HA.
  • the HA transfers to the CoA associated with the HoA.
  • the MN becomes always communicable by the HoA.
  • an application running on the MN always uses an IP address called the HoA above to communicate.
  • the CoA is used for a source address or a destination address of an actual IPv6 packet. Further, in order to hide movement from higher-order applications, technologies such as an IPv6 in IPv6 encapsulation and a mobility header are used. As a result, the HoA is notified to the application to hide an IPv6 address (CoA) actually used.
  • CoA IPv6 address
  • FMIPv6 Fest Handovers for Mobile IPv6
  • RtSolPr Ring Solicitation for Proxy Advertisement, a router solicitation proxy, hereinafter, referred to as “RtSolPr”
  • RtSolPr Route Solicitation for Proxy Advertisement, a router solicitation proxy, hereinafter, referred to as “RtSolPr”
  • a router solicitation a router request
  • the MN sends the RtSolPr to a PAR (Previous Access Router, an access router in communication, hereinafter, referred to as “PAR”).
  • PAR Previous Access Router, an access router in communication
  • PrRtAdv Proxy Router Advertisement, a proxy router advertisement, hereinafter, referred to as “PrRtAdv”
  • PrRtAdv a proxy router advertisement
  • the MN Upon receipt of the PrRtAdv from the PAR, the MN sends an FBU (Fast Binding Update) that is a binding update for a high-speed handover to the PAR at S 1203 .
  • the FBU includes NCoA (New Care of address, a new CoA, hereinafter, referred to as “NCoA”) information, and since the NCoA is an address belonging to a link of an NAR (New Access Router, an access router at a movement destination, hereinafter referred to as “NAR”), the PAR is capable of transferring a packet to the NAR.
  • NCoA New Care of address, a new CoA, hereinafter, referred to as “NCoA”
  • NAR New Access Router, an access router at a movement destination
  • the PAR Upon receipt of the FBU from the MN, the PAR sends an HI (Handover Initiate, hereinafter, referred to as “HI”) to the NAR to switch the MN and initialize a handover at 1204 .
  • HI Handover Initiate
  • the NAR sends, as confirmation for the HI, an HAck (Handover Acknowledgement, hereinafter, referred to as “HAck”) to the PAR at S 1205 , and packet transfer is started between the PAR and the NAR at S 1206 .
  • the MN sends an FNA (Fast Neighbor Advertisement, a high-speed neighbor advertisement, hereinafter, referred to as “FNA”) to the NAR at S 1207 .
  • FNA Fast Neighbor Advertisement, a high-speed neighbor advertisement, hereinafter, referred to as “FNA”
  • the Mobile IP above performs mobility management by signaling driver from the mobile-terminal-side and is therefore called a mobility protocol on a host base.
  • the IETF Internet Engineering Task Force
  • a network base IP mobility protocol in which signaling for movement control is performed in the network side and the MN is capable of moving without a specific protocol for movement to be mounted (for example, see Non-Patent Literature 3).
  • the MN sends an RS (Router Solicitation, a router request, hereinafter, referred to as “RS”) or a network configuration (network setting) request message such as a DHCP Request to a router of a link at a movement destination described as “NewMAG” in FIG. 22 , a mobile access gateway (Mobile Access Gateway, hereinafter, referred to as “MAG”).
  • RS Receiver Solicitation, a router request, hereinafter, referred to as “RS”) or a network configuration (network setting) request message such as a DHCP Request to a router of a link at a movement destination described as “NewMAG” in FIG. 22 , a mobile access gateway (Mobile Access Gateway, hereinafter, referred to as “MAG”).
  • RS Receiver Solicitation, a router request, hereinafter, referred to as “RS”) or a network configuration (network setting) request message such as a DHCP Request to a router of a link at a movement destination described as “NewMAG
  • the MAG refers to a router that performs relaying between the MN moving to the link and a route router serving as a control apparatus for controlling an IP mobility, a local mobility anchor (Local Mobility Anchor, hereinafter, referred to as “LMA”).
  • LMA Local Mobility Anchor
  • the LMA controls a plurality of MAGs connected by a network.
  • the LMA manages identifiers of the MN and MAG and IP addresses in a storage portion.
  • the MAG also manages identifiers of the MN and LMA and IP addresses in a storage portion.
  • the information managed by the MAG can be acquired by performing communication with the LMA.
  • tunneling is performed between the MAG and the LMA so that routing can be performed properly.
  • the MN sends, here, for example, the RS to the MAG in the same link at a movement destination.
  • the MAG Upon receipt of the RS from the MN, the MAG (NewMAG) sends a location registration (location registration request) to the LMA at S 1302 .
  • the LMA Upon receipt of the location registration, the LMA detects as a handover, and, at S 1303 , sends a routing set-up to the MAG (NewMAG) and sets a tunnel path between the NewMAG and the LMA.
  • MAG NewMAG
  • Setting of the tunnel path means to set so that a packet for the MN is encapsulated in the LMA, sent to the MAG (NewMAG), decapsulated in the MAG, and then transferred to the MN.
  • MAG NewMAG
  • the MAG Upon receipt of the routing set-up, the MAG (NewMAG) sends a routing set-up Ack for confirmation to the LMA at S 1304 .
  • the LMA upon receipt of the location registration from the MAG (NewMAG), the LMA sends a location registration Ack for confirmation to the MAG (NewMAG) at S 1305 .
  • the MAG (NewMAG) sends an RA to the MN and the MN performs an address configuration (address setting).
  • the MN performs a DAD (Duplicate Address Detection, a duplicate address detection, hereinafter, referred to as “DAD”) with respect to the MAG (NewMAG) using an NA (Neighbor Advertisement, a neighbor advertisement, hereinafter, referred to as “NA”), and confirms that the address is single to complete the address configuration.
  • DAD Downlicate Address Detection, a duplicate address detection
  • NA NA
  • the MAG sends an MN address set-up to the LMA at S 1308
  • the LMA sends an MN address set-up Ack to the MAG (NewMAG) at S 1309 .
  • the tunnel path is set between the LMA and the MAG and the address configuration in the MN is completed, the packet is reachable to the MN.
  • This is a method for the handover of the network base IP mobility protocol. That is, since a packet addressed to the MN is sent through the LMA, by completing a tunnel between the LMA and the MAG, routing to the MN is possible.
  • packets delivered to an LMA in a period from a time when an MN disconnects connection with a router (PreMAG) in a link at a movement source ((1) in FIG. 1 ) and starts connection with a NewMAG to a time a result thereof is delivered to the LMA as a location registration ((2) in FIG. 2 ) can not be held in the LMA and are surely delivered to the PreMAG. That is, the packets delivered to the PreMAG have to be discarded after waiting until a fixed time has elapsed.
  • the method using the FMIPv6 and the like described in FIG. 21 describe that a tunnel between a PAR and an NAR is created at the time of a handover but does not describe about deletion, thus a router has to hold the tunnel endlessly when there is no timer. As a result, there is a possibility that a resource in the router is lost.
  • the present invention has been made in view of the above problems, it is therefore an object of the present invention to provide a communication system, a control apparatus, a router, and communication method thereof, that are capable of eliminating loss in packets during a handover and effectively releasing a resource of a router in a network base IP mobility protocol in which a mobile terminal is movable without mounting a special protocol.
  • a communication system using a network base IP mobility protocol in which, using the network base IP mobility protocol, a mobile terminal sends and receives data from a router belonging in a same link with a uniquely applied address to perform communication, and when the mobile terminal moves to another network, communication is switched by control of a control apparatus, is characterized in that the router in a network at a movement destination of the mobile terminal receives a notification including an identifier of the mobile terminal from the mobile terminal and sends a notification including the identifier of the mobile terminal and an identifier of the router to the control apparatus, and the control apparatus sends a transfer instruction notification to the router at a movement source or the movement destination of the mobile terminal so that data is transferred from the router at the movement source to the router at the movement destination.
  • a communication system using the network base IP mobility protocol according to the second aspect of the present invention is characterized in that the router at the movement destination sends the identifier of the mobile terminal to an information management apparatus that performs an authentication and receives information including address setting information of the mobile terminal and the control apparatus from the information management apparatus.
  • a communication system using the network base IP mobility protocol is characterized in that, when the mobile terminal is moved, data is sent from the control apparatus through the router at the movement source and the router at the movement destination to the mobile terminal, and after communication of the control apparatus and the router at the movement destination and communication of the router at the movement destination and the mobile terminal are established, data is sent from the control apparatus only through the router at the movement destination to the mobile terminal.
  • a communication system using the network base IP mobility protocol according to the fourth aspect of the present invention is characterized in that, when the router at the movement source has received data addressed to the mobile terminal from another router by transfer, the control apparatus sends a transfer cancel instruction notification for instructing cancel of setting for the transfer.
  • a communication system using the network base IP mobility protocol according to the fifth aspect of the present invention is characterized in that, when it is detected that there is no data in a buffer for transferring with respect to the mobile terminal, the router at the movement source sends a transfer cancel instruction notification for canceling transfer setting to the router at the movement destination.
  • a communication system using the network base IP mobility protocol is characterized in that, when a communication termination notification is received from the mobile terminal or when an abnormal communication termination of the mobile terminal is detected, the router at the movement destination sends a transfer cancel instruction notification for canceling transfer setting to the router at the movement source.
  • a control apparatus in a system where, using a network base IP mobility protocol, a mobile terminal sends and receives data from a router belonging in a same link with a uniquely applied address to perform communication, that performs control to switch communication when the mobile terminal moves to another network, including a communication means for receiving a notification including an identifier of the mobile terminal and an identifier of the router from the router in a network at a movement destination of the mobile terminal; a storage means for holding communication information of the router that performs relaying and the mobile terminal; and a control means for referring to the storage means with respect to communication information of the mobile terminal from the identifier of the mobile terminal included in the notification from the router and updating information of the router at the movement destination to generate a transfer instruction notification for instructing transfer of data from the router at the movement source to the router at the movement destination, and is characterized in that the communication means sends the transfer instruction notification to the router at the movement source or the movement destination of the mobile terminal.
  • a control apparatus is characterized in that the control means extracts an identifier of the router at the movement source of the mobile terminal from the identifier of the mobile terminal included in the notification from the router at the movement destination by the storage means, and the transfer instruction notification to the router at the movement source or the movement destination includes the identifier of the router at the movement destination or the identifier of the router at the movement source, and the identifier of the mobile terminal.
  • a control apparatus is characterized in that the control means generates a deletion instruction notification for instructing to the router at the movement source to delete communication information of the router and the control apparatus concerning the mobile terminal and sends it to the router at the movement source through the communication means.
  • a control apparatus is characterized in that the control means synthesizes the deletion instruction notification and the transfer instruction notification and sends to the router at the movement source through the communication means.
  • a control apparatus is characterized in that, after communication of the control apparatus and the router at the movement destination and communication of the router at the movement destination and the mobile terminal are established, the control means sends data to the router at the movement destination.
  • a control apparatus is characterized in that, when the router at the movement source has received data addressed to the mobile terminal from another router by transfer, the control means generates a transfer setting cancel notification including the identifier of the mobile terminal and the identifier of the another router to delete setting for the transfer, and the communication means sends the transfer instruction notification to the router at the movement source and further sends the transfer setting cancel notification to the router at the movement source.
  • a control apparatus is characterized in that, when the router at the movement source has received data addressed to the mobile terminal from another router by transfer, the control means generates a transfer setting cancel notification including the identifier of the mobile terminal and the identifier of the another router to delete setting for the transfer, and the communication means sends the transfer instruction notification to the router at the movement source and further sends the transfer setting cancel notification to the router at the movement source.
  • a control apparatus is characterized in that the control means synthesizes the transfer instruction notification and the transfer setting cancel notification and sends to the router at the movement source.
  • control apparatus synthesizes the transfer instruction notification and the transfer setting cancel notification and sends to the router at the movement source.
  • a control apparatus is characterized in that the control means synthesizes a notification for instructing cancel of communication with the control apparatus and the transfer setting cancel notification and sends to the router at the movement source.
  • a control apparatus is characterized in that the control means synthesizes a notification for instructing cancel of communication with the control apparatus and the transfer setting cancel notification and sends to the router at the movement source.
  • a router that uses a network base IP mobility protocol to perform transmission and reception of data to and from a mobile terminal belonging in a same link that performs communication with a uniquely applied address by control of a control apparatus, including: a communication means for receiving a notification from a mobile terminal that has moved; and a control means for generating a notification including an identifier of the mobile terminal and an identifier of the router to be sent to the control apparatus; and is characterized in that the communication means sends the notification to the control apparatus, and the control means transfers data received from the router at a movement source to the mobile terminal by a transfer instruction notification from the control apparatus or a notification from the router at the movement source.
  • a router according to the nineteenth aspect of the present invention is characterized in that, when a transfer instruction notification of the mobile terminal that has moved to another network is received from the control apparatus, the control means transfers data addressed to the mobile terminal to the router at the movement destination.
  • a router according to the twentieth aspect of the present invention is characterized in that the control means transfers data addressed to the mobile terminal with an address of the router at the movement destination added as a header.
  • a router according to the twenty-first aspect of the present invention is characterized in that the communication means sends the received identifier of the mobile terminal to an information management apparatus that performs an authentication and receives information including address setting information of the mobile terminal and the control apparatus from the information management apparatus.
  • a router further including a storage means for holding communication information of the mobile terminal, and is characterized in that, when a deletion instruction notification is received from the control apparatus, the control means deletes communication information of the router and the control apparatus concerning the mobile terminal from the storage means.
  • a router according to the twenty-third aspect of the present invention is characterized in that by a notification from the control apparatus that has received, by transfer, data addressed to the mobile terminal from another router to instruct cancel of transfer setting, the control means sends a transfer setting cancel notification including the identifier of the mobile terminal and the identifier of the router to the another router.
  • a router according to the twenty-fourth aspect of the present invention is characterized in that the communication means receives the transfer instruction notification from the control apparatus with which the transfer setting cancel notification is synthesized.
  • a router according to the twenty-fifth aspect of the present invention is characterized in that the communication means receives a notification for instructing cancel of communication with the control apparatus from the control apparatus with which the transfer setting cancel notification is synthesized.
  • a router according to the twenty-sixth aspect of the present invention is characterized in that, when it is detected that there is no data in a buffer to be transferred with respect to the mobile terminal, the control means sends a notification for canceling transfer setting to the router at the movement destination.
  • a router according to the twenty-seventh aspect of the present invention is characterized in that, when a communication termination notification is received from the mobile terminal or when an abnormal communication termination of the mobile terminal is detected, the control means sends a notification for canceling transfer setting to the router at the movement destination.
  • a communication method that, using a network base IP mobility protocol, causes a mobile terminal to send and receive data from a router belonging in a same link with a uniquely applied address, and when the mobile terminal moves to another network, causes a control apparatus to perform control to switch communication of the mobile terminal, and is characterized in that the mobile terminal is caused to execute: a step of generating a notification including an identifier of the mobile terminal; and a step of sending the notification to the router at a movement destination; the router at the movement destination is caused to execute: a step of generating a notification including the identifier of the mobile terminal and an identifier of the router; and a step of sending the notification to the control apparatus; and the control apparatus is caused to execute: a step of generating a transfer instruction notification for instructing transfer of data from the router at a movement source to the router at the movement destination; and a step of sending the transfer instruction notification to the router at the movement source or the movement destination.
  • a communication method is characterized in that the router at the movement destination is caused to send the identifier of the mobile terminal to an information management apparatus that performs an authentication, and the router at the movement destination receives information including address setting information of the mobile terminal and the control apparatus from the information management apparatus.
  • a communication method when the mobile terminal is moved, the control apparatus is caused to send data through the router at the movement source and the router at the movement destination to the mobile terminal, and after communication of the control apparatus and the router at the movement destination and communication of the router at the movement destination and the mobile terminal are established, the control apparatus is caused to send data only through the router at the movement destination to the mobile terminal.
  • a communication method when the router at the movement source has received by transfer data addressed to the mobile terminal from another router, the control apparatus is caused to send to the router at the movement source a transfer cancel instruction notification for instructing cancel of setting for the transfer.
  • a control apparatus in a network base IP mobility protocol, with control by a control apparatus, by generating a tunnel from a router at a movement source to a router at a movement destination and performing transfer of data, it is possible to eliminate loss in packets during a handover.
  • a control apparatus synthesizes a transfer instruction notification of buffer of packets addressed to the mobile terminal and a deletion instruction notification for instructing deletion of communication setting between the control apparatus and the router at the movement source and sends it to the router at the movement source, thus making is possible to perform processing of buffer transfer and deletion of tunnel setting between the control apparatus and the router at the movement source smoothly.
  • control apparatus synthesizes a transfer instruction notification of a buffer of packets addressed to a mobile terminal and a deletion instruction notification for instructing deletion of unnecessary communication setting between the router at the movement source and another router and sends it to the router at the movement source, thus making it possible to perform processing of buffer transfer and deletion of unnecessary tunnel setting between routers smoothly.
  • control apparatus synthesizes a deletion instruction notification for instructing deletion of communication setting between the control apparatus and the router at the movement source and a deletion instruction notification for instructing deletion of unnecessary communication setting between the router at the movement source and another router and sends it to the router at the movement source, thus making it possible to perform processing of deletion of tunnel setting between the control apparatus and the router at the movement source and deletion of unnecessary tunnel setting between routers smoothly.
  • FIG. 1 is a view illustrating the schematic structure of a network in a first embodiment.
  • FIG. 2 is a sequence diagram illustrating processing procedures in the first embodiment.
  • FIG. 3 is a block diagram illustrating the structure of an MAG in the present invention.
  • FIG. 4 is a block diagram illustrating the structure of an LMA in the present invention.
  • FIG. 5 is a sequence diagram illustrating processing procedures in a second embodiment.
  • FIG. 6 is a view illustrating the schematic structure of a network in a third embodiment.
  • FIG. 7 is a sequence diagram illustrating processing procedures in the third embodiment.
  • FIG. 8 is a table illustrating addresses of each apparatus in the third embodiment.
  • FIG. 9 is a view illustrating the schematic structure of a network in a fourth embodiment and the flow of a packet.
  • FIG. 10 is a sequence diagram illustrating processing procedures in the fourth embodiment.
  • FIG. 11 is a view illustrating the schematic structure of a network in a fifth embodiment.
  • FIG. 12 is a sequence diagram illustrating processing procedures in the fifth embodiment.
  • FIG. 13 is a sequence diagram illustrating processing procedures in a sixth embodiment.
  • FIG. 14 is a sequence diagram illustrating processing procedures in a seventh embodiment.
  • FIG. 15 is a sequence diagram illustrating processing procedures in an eighth embodiment.
  • FIG. 16 is a sequence diagram illustrating processing procedures in a ninth embodiment.
  • FIG. 17 is a view illustrating the schematic structure of a network in a tenth embodiment.
  • FIG. 18 is a sequence diagram illustrating processing procedures in the tenth embodiment.
  • FIG. 19 is a view illustrating the schematic structure of a network in an eleventh embodiment.
  • FIG. 20 is a sequence diagram illustrating processing procedures in the eleventh embodiment.
  • FIG. 21 is a sequence diagram illustrating processing procedures in a fast handover method.
  • FIG. 22 is a sequence diagram illustrating processing procedures in a handover method for a conventional network base IP mobility protocol.
  • FIG. 23 is a sequence diagram illustrating processing procedures of a handover method for a conventional network base IP mobility protocol.
  • An MN and an MAG generally have wireless communication means, and description in all of the embodiments will be given mainly in view of a handover by wireless communication, but use by wired communication is also possible and communication means is not particularly limited, thus detailed description for the communication means will be omitted.
  • FIG. 1 is a view illustrating the schematic structure of a network in the present embodiment.
  • FIG. 2 is a sequence diagram illustrating processing procedures in the present embodiment.
  • FIG. 3 is a block diagram illustrating the structure of an MAG in the present embodiment.
  • FIG. 4 is a block diagram illustrating the structure of an LMA in the present embodiment.
  • the MAGs 2 and 3 are configured by including an MN communication means 5 for performing communication with the MN 1 , an Netlmm communication means 6 for performing communication with another MAG or the LMA 4 , an Netlmm control means 7 for performing control by a network base IP mobility protocol according to the present invention, a storage portion 8 for storing information and the like with respect to communication, and a temporal storage portion 9 for storing a buffer addressed to the MN.
  • the LMA 4 is configured by including an Netlmm communication means 10 for performing communication with the MAGs 2 and 3 , an external network communication means 11 for performing communication with an external network, an Netlmm control means 12 for performing control by a network base IP mobility protocol according to the present invention, and a storage portion 13 for storing information and the like with respect to communication.
  • the MN 1 sends an RS including at least an MN-ID as an identifier of the MN 1 to the MAGb 3 or a link local multicast address at S 101 .
  • the Netlmm control means 7 of the MAGb 3 that has received the RS from the MN communication means 5 stores the MN-ID in the storage portion 8 , as well as, at S 102 , generates a location registration including at least the MN-ID and an MAGb-ID as an identifier of the MAGb 3 , and sends it from the Netlmm communication means 6 to the LMA 4 .
  • the Netlmm control means 12 of the LMA 4 that has received the location registration from the Netlmm communication means 10 searches a current state of the MN 1 from data held in the storage portion 13 of the LMA 4 with the MN-ID as a key and grasps that the MN 1 is in a state of belonging to the MAGa 2 currently in the data.
  • the Netlmm control means 12 of the LMA 4 recognizes that the MN 1 is in the state of belonging to the MAGa 2 currently in the data, but when the location registration has come from the MAGb 3 , the MN 1 was moved.
  • the Netlmm control means 12 of the LMA 4 generates a routing set-up (routing setting instructions) including at least an LMA-ID as an identifier of the LMA 4 and a global address of the MN 1 and sends it from the Netlmm communication means 10 to the MAGb 3 . Further, at S 104 , the Netlmm control means 12 of the LMA 4 sends a transfer instruction notification including at least the MAGb-ID of the MAGb 3 and the MN-ID of the MN 1 to the MAGa 2 .
  • the Netlmm control means 7 of the MAGa 2 that has received the transfer instruction notification starts transfer of packets addressed to an address of the MN 1 identified in the MN-ID to an IP address of the MAGb 3 identified in the MAGb-ID at S 105 .
  • This transfer setting is performed by update of a routing table in the storage portion 8 of the MAGa 2 . That is, the packets addressed to the MN 1 have been associated with a link local address of the MN 1 in the routing table of the MAGa 2 until now.
  • the setting in the routing table is updated so that the packets addressed to the MN 1 are transferred to the MAGb 3 .
  • the transfer to the MAGb 3 is realized by setting so that a next hop of the packets addressed to the MN 1 is transferred to any one of a link local address of the MAGb 3 , a global address of the MAGb 3 , a higher-order router address of the MAGb 3 , and a higher-order router address of the MAGa 2 .
  • the Netlmm control means 7 of the MAGb 3 that has received the routing set-up from the LMA 4 sets a tunnel path between the LMA 4 and the MAGb 3 , and sends a routing set-up Ack (Acknowledgement) for confirmation to the LMA 4 at S 106 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGb 3 sends a location registration Ack including at least prefix information of the MN 1 to the MAGb 3 at S 107 .
  • the Netlmm control means 7 of the MAGb 3 that has received the location registration Ack sends an RA to the MN 1 based on the prefix information above at S 108 .
  • the MN 1 that has received the RA from the MAGb 3 sends an NA to a link in the DAD procedure at S 109 .
  • the Netlmm control means 7 of the MAGb 3 receives the NA from the MN 1 and thereafter sends an MN address set-up including the MAGb-ID, the MN address and the MN-ID to the LMA 4 at S 110 , and the Netlmm control means 12 of the LMA 4 sends an MN address set-up Ack for conformation to the MAGb 3 at S 111 .
  • the Netlmm control means 7 of the MAGb 3 starts delivery of packets including transfer from the MAGa 2 to the MN 1 .
  • packets addressed to the MN 1 that have been stored in the buffer of the MAGa 2 from a time the MN 1 was cut from the MAGa 2 for movement until the location registration has reached to the LMA 4 are transferred through the MAGb 3 , which allows communication without loss in packets.
  • FIG. 5 is a sequence diagram illustrating processing procedures in the present embodiment.
  • the MN 1 moves from the link of the MAGa 2 to the link of the MAGb 3 as shown in FIG. 1 .
  • a different point from the first embodiment is that while the LMA 4 sends the transfer instruction notification for the router MAGb 3 at a movement destination to the router MAGa 2 at a movement source in the first embodiment, the LMA 4 sends the transfer instruction notification to the MAGb 3 in the present embodiment.
  • the MN 1 sends an RS including at least an MN-ID as an identifier of the MN 1 to the MAGb 3 or a link local multicast address at S 201 .
  • the Netlmm control means 7 of the MAGb 3 that has received the RS from the MN 1 sends a location registration including at least the MN-ID and an MAGb-ID as an identifier of the MAGb 3 to the LMA 4 at S 202 .
  • the Netlmm control means 12 of the LMA 4 that has received the location registration from the MAGb 3 searches a current state of the MN 1 from data held in the storage portion 13 of the LMA 4 with the MN-ID as a key and grasps that the MN 1 is in a state of belonging to the MAGa 2 currently in the data of the LMA 4 .
  • the Netlmm control means 12 of the LMA 4 recognizes that the MN 1 is in a state of belonging to the MAGa 2 currently in the data, but when the location registration has come from the MAGb 3 , the MN 1 was moved.
  • the Netlmm control means 12 of the LMA 4 sends a routing set-up including at least an LMA-ID as an identifier of the LMA 4 and a global address of the MN 1 for generation of a tunnel between the LMA 4 and the MAGb 3 to the MAGb 3 .
  • the Netlmm control means 12 of the LMA 4 sends a transfer instruction notification including at least an MAGa-ID as an identifier of the MAGa 2 and the MN-ID of the MN 1 to the MAGb 3 .
  • the transfer instruction notification from the LMA 4 to the MAGb 3 maybe sent in addition to a normal routing set-up.
  • the Netlmm control means 7 of the MAGb 3 that has received the transfer instruction notification from the LMA 4 sends a tunnel generation message including at least the MN-ID and the MAGb-ID of the MAGb to an IP address of the MAGa 2 grasped from the MAGa-ID of the MAGa 2 at S 204 .
  • the Netlmm control means 7 of the MAGa 2 that has received the tunnel generation message from the MAGb 3 sets a tunnel path with the MAGb 3 and, at S 205 , sends a tunnel generation Ack for confirmation to the MAGb 3 so that packets addressed to the MN 1 in the buffer of the MAGa 2 can be transferred to the MAGb 3 .
  • the tunnel path is realized by performing IPv6 in IPv6 encapsulation in which the IP address of the MAGb 3 serves as an external destination address and the IP address of the MAGa 2 serves as an external source address.
  • the Netlmm control means 7 of the MAGb 3 that has received the routing set-up sets a tunnel path between the LMA 4 and the MAGb 3 and sends a routing set-up Ack to the LMA 4 at S 206 .
  • the Netlmm control means 7 of the MAGa 2 that has received the transfer instructions starts transfer of the packets addressed to the MN 1 identified in the MN-ID to the IP address of the MAGb 3 identified in the MAGb-ID at S 207 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGb 3 sends a location registration Ack including at least prefix information of the MN 1 to the MAGb 3 at S 208 .
  • the Netlmm control means 7 of the MAGb 3 that has received the location registration Ack from the LMA 4 sends an RA to the MN 1 based on the prefix information above at S 209 .
  • the MN 1 that has received the RA from the MAGb 3 sends an NA to the link in the DAD procedure at S 210 .
  • the Netlmm control means 7 of the MAGb 3 receives the NA from the MN 1 and thereafter sends an MN address set-up including the MAGb-ID, the MN address and the MN-ID to the LMA 4 at S 211 , and the Netlmm control means 12 of the LMA 4 sends an MN address set-up Ack for confirmation to the MAGb 3 at S 212 .
  • the Netlmm control means 7 of the MAGb 3 starts delivery of the packets addressed to the MN 1 , including transfer from the MAGa 2 .
  • FIG. 6 is a view illustrating the schematic structure of a network in the present embodiment.
  • FIG. 7 is a sequence diagram illustrating processing procedures in the present embodiment.
  • FIG. 8 is a table illustrating addresses of each apparatus in the present embodiment.
  • an MNa 21 and an MNb 22 are under the control of the MAGa 2 at first. Description will be given for an example where in association with movement of the MNa 21 and the MNb 22 , the MNa 21 and the MNb 22 move from under the control of the MAGa 2 to under the control of the MAGb 3 .
  • the MNa 21 and the MNb 22 send an RS including at least an MNa-ID and an MNb-ID as identifiers of the MNa 21 and the MNb 22 to the MAGb 3 or a link local multicast address.
  • a link local address IP_LINK_MNa, IP_LINK_MNb
  • a global address IP_GLOBAL_MNa, IP_GLOBAL_MNb
  • the Netlmm control means 7 of the MAGb 3 that has received the RS from the MNa 21 and the MNb 22 sends a location registration including at least the MNa-ID, the MNb-ID, and the MAGb-ID of the MAGb 3 to the LMA 4 (to IP_LINK_LMAa or IP_GLOBAL_LMAa) at S 302 .
  • a link local address (IP_LINK_MAGb) and/or a global address (IP_GLOBAL_MAGb) of the MAGb are used for the MAGb-ID.
  • This location registration may be sent individually to each of the MNa 21 and the MNb 22 or may be included in one message and sent to both of them.
  • the Netlmm control means 12 of the LMA 4 that has received the location registration from the MAGb 3 searches current states of the MNa 21 and the MNb 22 from data held in the storage portion 13 of the LMA 4 with the MNa-ID and the MNb-ID as keys and grasps that the MNa 21 and the MNb 22 are in a state of belonging to the MAGa 2 currently in the data of the LMA 4 .
  • the Netlmm control means 12 of the LMA 4 recognizes that the MNa 21 and the MNb 22 are in a state of belonging to the MAGa 2 currently in the data, but when the location registration has come from the MAGb 3 , the MNa 21 and the MNb 22 were moved.
  • the Netlmm control means 12 of the LMA 4 sends a routing set-up to the MAGb 3 .
  • the Netlmm control means 12 of the LMA 4 sends a transfer instruction notification including at least the MAGb-ID of the MAGb (IP_LINK_MAGb, and/or IP_GLOBAL_MAGb) and the MN-ID of the MNa 21 and the MNb 22 (IP_LINK_MNa and/or IP_GLOBAL_MNa, IP_LINK_MNb and/or IP_GLOBAL_MNb) to the MAGa 2 .
  • the transfer instruction notification may be performed individually to the MNa 21 and the MNb 22 or may be performed collectively.
  • a location deregistration (a location deletion request) is sent to the MAGa 2 .
  • the transfer instruction notification to the MAGa 2 may be included in the location deregistration.
  • the Netlmm control means 7 of the MAGa 2 that has received the transfer instructions offers generation of a tunnel between the MAGa and the MAGb to the MAGb 3 in order to transfer packets addressed to addresses of the MNa 21 and the MNb 22 (whose destination address is IP_GLOBAL_MNa or IP_GLOBAL_MNb) identified in the MNa-ID and the MNb-ID to an IP address of the MAGb 3 identified in the MAGb-ID at S 305 .
  • the Netlmm control means 7 of the MAGb 3 that has received the routing set-up from the LMA 4 sets a tunnel path between the LMA 4 and the MAGb 3 and sends a routing set-up Ack to the LMA 4 at S 306 .
  • the Netlmm control means 7 of the MAGb 3 that has received the tunnel generation request from the MAGa 2 returns a tunnel generation Ack to the MAGa 2 for confirmation at S 307 .
  • the Netlmm control means 7 of the MAGa 2 Upon receipt of the tunnel generation Ack of the MAGb 3 , the Netlmm control means 7 of the MAGa 2 generates a tunnel between the MAGa and the MAGb.
  • This tunnel is realized by performing IPV6 in IPv6 encapsulation in which the global address of the MAGb 3 (IP_GLOBAL_MAGb) serves as an external destination address and the global address of the MAGa 2 (IP_GLOBAL_MAGa) serves as an external source address.
  • this tunnel serves as a tunnel though which packets addressed to the MNa 21 and MNb 22 (whose destination address is IP_GLOBAL_MNa or IP_GLOBAL_MNb) pass.
  • the MAGa 2 grasps unreached packets to the MNa 21 and/or the MNb 22 by using a technology of a second layer or lower of the OSI Basic Reference Model.
  • the unreached packets are saved in the buffer of the MAGa 2 and transferred to the MAGb 3 successively after the tunnel is created, at S 308 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGb 3 sends a location registration Ack including at least prefix information of the MN to the MAGb 3 at S 309 .
  • the Netlmm control means 7 of the MAGb 3 that has received the location registration Ack sends an RA to the MNa 21 and the MNb 22 based on the prefix information above at S 310 .
  • the MNa 21 and the MNb 22 that have received the RA from the MAGb 3 sends an NA to the link in the DAD procedure at S 311 .
  • the Netlmm control means 7 of the MAGb 3 receives the NA from the MNa 21 or the MNb 22 and thereafter sends an MN address set-up including the MAGb-ID, the MN address and the MN-ID to the LMA 4 at S 312 , the Netlmm control means 12 of the LMA 4 sends an MN address set-up Ack for conformation at S 313 , and the MAGb 3 starts delivery of packets addressed to the MNa 21 and the MNb 22 at S 314 .
  • the packets addressed to the MNa 21 or the MNb 22 that have been stored in the buffer of the MAGa 2 are transferred through the MAGb 3 , which can eliminate loss in packets due to the handover.
  • transfer instructions to the MAGb 3 to which an ID of the MAGb 3 is added in the location deregistration to be sent to the MAGa 2 for cancelling tunneling, it is possible to perform cancel of tunneling between the LMA and the MAGa 2 and setting of tunneling for transfer from the MAGa 2 to the MAGb 3 smoothly.
  • FIG. 9 is a view illustrating the schematic structure of a network in the present embodiment and the flow of a packet.
  • FIG. 10 is a sequence diagram illustrating processing procedures in the present embodiment.
  • the MN 1 is under the control of the MAGa 2 at first. A packet at this time is delivered as shown by the emphasized line arrow in FIG. 9( a ). Thereafter, the MN 1 is moved to be under the control of the MAGb 3 .
  • the packet is delivered from the LMA 4 through the MAGa 2 and from the MAGb 3 to the MN 1 ( FIG. 9( b ) and FIG. 9( c )), and subsequently delivered from the LMA 4 to the MAGb 3 without passing through the MAGa 2 and from the MAGb 3 to the MN 1 ( FIG. 9( d )) successively in a switching manner.
  • the MN 1 When the MN 1 moves to a link of the MAGb 3 , as shown in FIG. 10 , the MN 1 sends a network configuration request, such as an RS, an DHCP Request, or an NA, including at least an MN-ID as an identifier of the MN 1 to the MAGb 3 or in a link local multicast at S 401 .
  • a network configuration request such as an RS, an DHCP Request, or an NA, including at least an MN-ID as an identifier of the MN 1 to the MAGb 3 or in a link local multicast at S 401 .
  • the Netlmm control means 7 of the MAGb 3 that has received the network configuration request from the MN 1 sends a location registration including at least its own identifier MAGb-ID and the MN-ID which has been received now to the LMA 4 at S 402 .
  • the Netlmm control means 12 of the LMA 4 Upon receipt of the location registration from the MAGb 3 , the Netlmm control means 12 of the LMA 4 searches a current state of the MN 1 from data held in the storage portion 13 of the LMA 4 with the MN-ID as a key and grasps that the MN 1 is in a state of belonging to the MAGa 2 currently from the data of the LMA 4 .
  • the Netlmm control means 12 of the LMA 4 recognizes that the MN 1 is in a state of belonging to the MAGa 2 currently in the data, but when the location registration has come from the MAGb 3 , the MN 1 was moved.
  • the Netlmm control means 12 of the LMA 4 sends a transfer instruction notification including the MN-ID, the MAGb-ID of the MAGb 3 , and a global address of the MN 1 to the MAGa 2 which is a previous MAG of the MN 1 and sends a routing set-up including at least an LAM-ID as an identifier of the LMA 4 and the global address of the MN 1 to the MAGb 3 at S 404 .
  • the Netlmm control means 7 of the MAGa 2 that has received the transfer instructions sends a tunnel generation offer to the MAGb 3 , and the Netlmm control means 7 of the MAGb 3 sends a tunnel generation Ack to the MAGa 2 to thereby generate a tunnel between the MAGa 2 and the MAGb 3 .
  • the packet is routed with paths from the LMA 4 to the MAGa 2 , from the MAGa 2 to the MAGb 3 , and from the MAGb 3 to the MN 1 at S 407 .
  • the Netlmm control means 7 of the MAGb 3 that has received the routing set-up from the LMA 4 sends a routing set-up Ack to the LMA 4 at S 408 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGb 3 sends a location registration Ack including at least prefix information of the MN 1 to the MAGb 3 at S 409 .
  • the Netlmm control means 7 of the MAGb 3 that has received the location registration Ack from the LMA 4 creates address configuration information for the MN 1 such as an RA from the prefix information to send it to the MN 1 at S 410 .
  • the MN 1 performs configuration of the address and performs a DAD for final confirmation with respect to the MAGb 3 by using an NA.
  • the Netlmm control means 7 of the MAGb 3 sends an MN address set-up including at least the MAGb-ID of the MAGb 3 , the MN address, and the MN-ID to the LMA 4 .
  • the DAD can be omitted, and it is also possible that after sending an address to the MN 1 by the DHCP Advertise or the like, the MAGb 3 sends the MN address set-up to the LMA 4 and the procedure proceeds to the following steps.
  • the Netlmm control means 12 of the LMA 4 sends an MN address set-up Ack to the MAGb 3 , and at S 414 , the Netlmm control means 7 of the MAGb 3 starts delivery of packets addressed to the MN 1 and received from the MAGa 2 .
  • a tunnel between the LMA and the MAGb is to be created at S 415 and S 416 .
  • the Netlmm control means 12 of the LMA 4 sends a location deregistration to the MAGa 2 at S 417
  • the Netlmm control means 7 of the MAGa 2 sends a location deregistration Ack to the LMA 4 to cancel the tunnel setting at S 418 .
  • the Netlmm control means 12 of the LMA 4 starts transfer of the packets to the MAGb 3 .
  • FIG. 11 is a view illustrating the schematic structure of a network in the present embodiment.
  • FIG. 12 is a sequence diagram illustrating processing procedures in the present embodiment.
  • the MN 1 performs switching of communication with three MAGs.
  • the MN 1 sends information for a network configuration to the MAGc 31 as an MAG of a new link as usual at S 501 .
  • This information is considered to include, for example, an RS, a DHCP Request, an NA and the like.
  • the information for the network configuration includes an MN-ID as an identifier of the MN.
  • the Netlmm control means 7 of the MAGc 31 saves information of the MN in the storage portion 8 and sends a location registration to the LMA 4 at S 502 .
  • This location registration includes an MAGc-ID as an identifier of the MAGc 31 and the MN-ID.
  • the Netlmm control means 12 of the LMA 4 that has received the location registration from the MAGc 31 searches data base in the storage portion 13 with the MN-ID as a key, and recognizes that the MN 1 is currently in a state of being in a link of the MAGb 3 in the data and that the MAGb 3 has a tunnel with the MAGa 2 .
  • the Netlmm control means 12 of the LMA 4 detects that the MN 1 is moving and in a handover, and temporarily stores the MAGb-ID, the MAGc-ID and the MN-ID as a set, and the MAGa-ID, the MAGb-ID and the MN-ID as a set.
  • the Netlmm control means 12 of the LMA 4 generates a routing set-up (routing setting instructions) including at least an LMA-ID as an identifier of the LMA 4 and a global address of the MN 1 and sends it from the Netlmm communication means 10 to the MAGc 31 .
  • the Netlmm control means 12 of the LMA 4 sends to the MAGc 3 a notification for instructing transfer of the packets addressed to the MN 1 to the MAGc 31 and deletion of the tunnel with the MAGa 2 .
  • this instruction notification includes at least the MAGa-ID, the MAGc-ID and the MN-ID, control information of the instruction notification describes to the effect that the tunnel (for packets addressed to the MN 1 ) is deleted in association with the MAGa-ID and the tunnel (for packets addressed to the MN 1 ) is generated in association with the MAGc-ID, and these control information are synthesized and sent simultaneously.
  • the Netlmm control means 12 of the LMA 4 accesses data base in the storage portion 13 , and stores information to the effect that information of the tunnel between the MAGb 3 and the MAGa 2 is deleted and a tunnel between the MAGc 31 and the MAGb 3 is newly formed in data of the MAG-MAG tunnel in communication information of the MN 1 .
  • the Netlmm control means 7 of the MAGb 3 Upon receipt of the instructions of the transfer and the instructions of tunnel deletion from the LMA 4 , the Netlmm control means 7 of the MAGb 3 sends to the MAGa 2 an instruction notification describing control information to the effect that the tunnel including at least the MAGb-ID and the MN-ID is deleted, at S 505 and sends to the MAGc 31 an instruction notification describing control information for offering tunnel generation including at least the MAGb-ID and the MN-ID at S 506 .
  • the Netlmm control means 7 of the MAGa 2 deletes tunnel setting between the MAGa 2 and the MAGb 3 from the routing table in the storage portion 8 , and sends a tunnel deletion Ack for confirmation to the MAGb 3 to delete the tunnel.
  • a confirmation notification is sent to the MAGb 3 , thus it is necessary to store the MAGb-ID and the MN-ID temporarily.
  • the Netlmm control means 7 of the MAGc 31 sets a tunneling with the MAGb 3 concerning the packets addressed to the MN 1 into the routing table in the storage portion 8 , and sends a tunnel generation Ack for confirmation to the MAGb 3 .
  • the packets addressed to the MN 1 are transferred to the MAGc 31 at S 509 .
  • the Netlmm control means 7 of the MAGc 31 that has received the routing set-up from the LMA 4 sends a routing set-up Ack to the LMA 4 at S 510 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGc 31 sends a location registration Ack including at least prefix information of the MN 1 to the MAGc 31 at S 511 .
  • the Netlmm control means 12 of the LMA 4 sends a location deregistration to the MAGb 3 in order to delete the tunnel between the LMA 4 and the MAGb 3 to the MAGb 3 , and, at S 513 , the Netlmm control means 7 of the MAGb 3 deletes tunnel setting concerning the LMA 4 -MAGb 3 from the routing table in the storage portion 8 , and sends a location deregistration Ack to the LMA 4 to cancel the tunnel setting.
  • the Netlmm control means 7 of the MAGc 31 that has received the location registration Ack from the LMA 4 generates address configuration information for the MN 1 such as an RA from the prefix information to send it to the MN 1 at S 514 .
  • the MN 1 performs configuration of the address and performs a DAD for final confirmation with respect to the MAGc 31 by using an NA.
  • the Netlmm control means 7 of the MAGc 31 sends an MN address set-up including at least the MAGc-ID, the MN address, and the MN-ID to the LMA 4 at S 516 .
  • the Netlmm control means 12 of the LMA 4 accesses data base of the storage portion 13 , deletes data of the MAGb 3 and stores data of the MAGc 31 in the data concerning the MAG that delivers packets in communication information of the MN 1 , and sends an MN address set-up Ack to the MAGc 31 , and the Netlmm control means 12 of the LMA 4 starts transfer of the packets to the MAGc 31 at S 518 . Further, the Netlmm control means 7 of the MAGc 31 starts delivery of the packets to the MN 1 at S 519 .
  • FIG. 13 is a sequence diagram illustrating processing procedures in the present embodiment.
  • a characteristic point lies in that the MAGa 2 itself cancels a tunnel with the MAGb 3 at a timing when there is no packets addressed to the MN 1 in the buffer of the router MAGa 2 at a movement source.
  • the MN 1 sends information for a network configuration, for example, an RS to the MAGb 3 which is a new MAG as usual.
  • This information includes an MN-ID as an identifier of the MN.
  • the Netlmm control means 7 of the MAGb 3 sends a location registration to the LMA 4 based on the received information.
  • This location registration includes an MAGb-ID as an identifier of the MAGb 3 and the MN-ID.
  • the Netlmm control means 12 of the LMA 4 that has received the location registration searches a data base in the storage portion 13 with the MN-ID as a key, and recognizes that the MN 1 is currently in a state of being under the control of the MAGa 2 in the data. As a result that the location registration is received, the Netlmm control means 12 of the LMA 4 detects that MN 1 is moving and in a handover, and temporarily stores the MAGa-ID, the MAGb-ID, and the MN-ID as a set. Then, at S 603 , the Netlmm control means 12 of the LMA 4 sends to the MAGa 2 a notification for instructing transfer of the packets addressed to the MN 1 to the MAGb 3 . It is preferable that this instruction notification includes at least the MAGb-ID and the MN-ID and describes control information to the effect that the tunnel (for packets addressed to the MN 1 ) is generated in association with the MAGb-ID simultaneously.
  • the Netlmm control means 12 of the LMA 4 generates a routing set-up including at least an LMA-ID as an identifier of the LMA 4 and a global address of the MN 1 to send it to the MAGb 3 .
  • the Netlmm control means 7 of the MAGa 2 Upon receipt of the transfer instructions from the LMA 4 , the Netlmm control means 7 of the MAGa 2 offers generation of a tunnel including at least the MAGa-ID and the MN-ID to the MAGb 3 at S 605 .
  • the Netlmm control means 7 of the MAGb 3 sets a tunneling with the MAGa 2 concerning the packets addressed to the MN 1 in the routing table in the storage portion 8 , and sends a tunnel generation Ack for confirmation to the MAGa 2 .
  • a tunnel for buffer transfer of the MAGa 2 is generated between the MAGa 2 and the MAGb 3 , and the MAGa 2 starts transfer of the packets addressed to the MN 1 to the MAGb 3 at S 607 .
  • the Netlmm control means 7 of the MAGb 3 that has received the routing set-up from the LMA 4 sends a routing set-up Ack to the LMA 4 at S 608 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGb 3 sends a location registration Ack including at least prefix information of the MN 1 to the MAGb 3 at S 609 .
  • the Netlmm control means 7 of the MAGb 3 that has received the location registration Ack from the LMA 4 creates address configuration information for the MN 1 such as an RA from the prefix information to send it to the MN 1 at S 610 .
  • the MN 1 performs configuration of the address and performs a DAD for final confirmation with respect to the MAGb 3 by using an NA.
  • the Netlmm control means 7 of the MAGb 3 sends an MN address set-up including at least the MAGb-ID of the MAGb 3 , the MN address, and the MN-ID to the LMA 4 at S 612 .
  • the Netlmm control means 12 of the LMA 4 accesses data base of the storage portion 13 , deletes data of the MAGa 2 and stores data of the MAGb 3 in the data concerning the MAG that delivers the packets in communication information of the MN 1 to generate a tunnel between the MAGb 3 and the LMA 4 , and sends an MN address set-up Ack to the MAGb 3 at S 613 , and the Netlmm control means 12 of the LMA 4 starts transfer of the packets to the MAGb 3 at S 614 . Further, the Netlmm control means 7 of the MAGb 3 starts delivery of the packets to the MN 1 at S 615 .
  • the Netlmm control means 7 of the MAGa 2 monitors the buffer of the temporal storage potion 9 , and when the buffer reaches zero, tunnel deletion is notified to the MAGb 3 to delete the tunnel.
  • the Netlmm control means 7 of the MAGa 2 deletes tunnel setting between the MAGa 2 and the MAGb 3 from the routing table in the storage portion 8 , and sends a notification for instructing deletion of the tunnel to the MAGb 3 .
  • this instruction notification includes at least MAGa-ID and the MN-ID, and control information of the instruction notification describes that the tunnel (for packets addressed to the MN 1 ) is deleted in association with the MAGa-ID.
  • the Netlmm control means 7 of the MAGb 3 sends a tunnel deletion Ack for confirmation to the MAGa 2 at S 617 .
  • the Netlmm control means 12 of the LMA 4 sends a location deregistration to the MAGa 2 in order to delete the tunnel between the LMA 4 and the MAGa 2 with respect to the MAGa 2
  • the Netlmm control means 7 of the MAGa 2 deletes tunnel setting concerning the LMA 4 and the MAGa 2 from the routing table in the storage portion 8 , and sends a location deregistration Ack to the LMA 4 to cancel the tunnel setting.
  • the MAG at the transfer source automatically cancels tunnel setting with the MAG at a transfer destination, thus making it possible to release a resource of the MAG effectively.
  • FIG. 14 is a sequence diagram illustrating processing procedures in the present embodiment.
  • a different point from the fifth embodiment is that the MAGb 3 deletes a tunnel with the MAGa 2 when receiving a location deregistration from the LMA 4 .
  • the MN 1 sends information for a network configuration to the MAGc 31 which is a new MAG as usual.
  • This information is considered to include, for example, an RS, a DHCP Request, an NA and the like.
  • This information includes at least an MN-ID as an identifier of the MN.
  • the Netlmm control means 7 of the MAGc 31 sends a location registration to the LMA 4 based on the received information.
  • This location registration includes an MAGc-ID as an identifier of the MAGc 31 and the MN-ID.
  • the Netlmm control means 12 of the LMA 4 that has received the location registration searches database in the storage portion 13 with the MN-ID as a key, and recognizes that the MN 1 is currently in a state of being in a link of the MAGb 3 in the data and that the MAGb 3 has a tunnel with the MAGa 2 .
  • the Netlmm control means 12 of the LMA 4 detects that the MN 1 is moving and in a handover, and temporarily stores the MAGb-ID, the MAGc-ID and the MN-ID as a set, and the MAGa-ID, the MAGb-ID and the MN-ID as a set, and then, at S 703 , generates a routing set-up including at least an LMA-ID as an identifier of the LMA 4 and a global address of the MN 1 to send to the MAGc 31 .
  • the Netlmm control means 12 of the LMA 4 sends to the MAGb 3 a notification for instructing transfer of packets addressed to the MN 1 to the MAGc 31 .
  • this instruction notification includes at least the MAGc-ID and the MN-ID, and describes control information to the effect that the tunnel (for packets addressed to the MN 1 ) is generated in association with the MAGc-ID.
  • the Netlmm control means 12 of the LMA 4 accesses communication information of the MN 1 in data base of the storage portion 13 , and stores information to the effect that a tunnel between the MAGb 3 and the MAGc 31 was generated in data of the MAG-MAG tunnel.
  • the Netlmm control means 7 of the MAGb 3 Upon receipt of the transfer instructions from the LMA 4 , the Netlmm control means 7 of the MAGb 3 offers generation of a tunnel including at least the MAGb-ID and the MN-ID to the MAGc 31 at S 705 .
  • the Netlmm control means 7 of the MAGc 31 sets a tunneling with the MAGb 3 concerning the packets addressed to the MN 1 in the routing table in the storage portion 8 , and sends a tunnel generation Ack for confirmation to the MAGb 3 .
  • a tunnel for buffer transfer of the MAGb 3 is generated between the MAGb and the MAGc, and at S 707 , the MAGb 3 starts transfer of the packets addressed to the MN 1 to the MAGc 31 .
  • the Netlmm control means 7 of the MAGc 31 that has received the routing set-up from the LMA 4 sends a routing set-up Ack to the LMA 4 at S 708 .
  • the Netlmm control means 12 of the LMA 4 that has received the routing set-up Ack from the MAGc 31 sends a location registration Ack including at least prefix information of the MN 1 to the MAGc 31 at S 709 .
  • the LMA 4 sends a location deregistration to the MAGb 3 .
  • the Netlmm control means 12 of the LMA 4 sends the location deregistration to the MAGb 3 in order to delete the tunnel between the LMA 4 and the MAGb 3 .
  • This is usually sent to delete the tunnel between the LMA 4 and the MAGb 3 and usually includes the MN-ID, the LMA-ID, and the MAGb-ID.
  • an MAGa-ID as an identifier of the MAGa 2 and control information for tunnel deletion instructions in connection with the MAGa 2 in association with MAGa-ID are added.
  • the tunnel with the MAGa 2 is also deleted.
  • the Netlmm control means 7 of the MAGc 31 that has received the location registration Ack from the LMA 4 creates address configuration information for the MN 1 such as an RA from the prefix information to send to the MN 1 at S 711 .
  • the MN 1 performs configuration of the address and performs a DAD for final confirmation with respect to the MAGc 31 by using an NA.
  • the Netlmm control means 7 of the MAGc 31 sends an MN address set-up including at least the MAGc-ID of the MAGc 31 , the MN address, and the MN-ID to the LMA 4 .
  • the Netlmm control means 7 of the MAGb 3 that has received from the LMA 4 the location deregistration to which the control information of tunnel deletion with the MAGa 2 is added, deletes tunneling setting between the LMA 4 and the MAGb 3 from the routing table in the storage portion 8 at S 714 , and sends a location deregistration Ack to the LMA 4 to cancel the tunneling setting.
  • This location deregistration Ack includes the MAGa-ID of the MAGa 2 and is associated with information showing deletion of the MAG-MAG tunnel.
  • the Netlmm control means 12 of the LMA 4 Upon receipt of the location deregistration Ack from the MAGb 3 , the Netlmm control means 12 of the LMA 4 extracts information of deletion of the MAG-MAG tunnel from the location deregistration Ack, recognizes that the tunnel between the MAGb 3 and the MAGa 2 is deleted, and deletes information of the tunnel between the MAGb 3 and the MAGa 2 from communication information of the MN 1 in data base of the storage portion 13 .
  • the Netlmm control means 7 of the MAGb 3 notifies the MAGa 2 of the tunnel deletion to delete the tunnel.
  • the Netlmm control means 7 of the MAGb 3 sends a notification for instructing deletion of the tunnel to the MAGa 2 .
  • this instruction notification include at least the MAGb-ID and the MN-ID and control information of the instruction notification describes that the tunnel (for packets addressed to the MN 1 ) is deleted in association with the MAGb-ID.
  • the Netlmm control means 7 of the MAGa 2 deletes tunnel setting between the MAGa 2 and the MAGb 3 from the routing table in the storage portion 8 and sends a tunnel deletion Ack for confirmation to the MAGb 3 .
  • the Netlmm control means 12 of the LMA 4 that has received the MN address set-up from the MAGc 31 accesses data base of the storage portion 13 , deletes data of the MAGb 3 and stores data of the MAGc 31 in data concerning the MAG that delivers packets in communication information of the MN 1 , and sends an MN address set-up Ack to the MAGc 31 at S 717 , and the Netlmm control means 12 of the LMA 4 starts transfer of the packets to the MAGc 31 at S 718 . Further, the Netlmm control means 7 of the MAGc 31 starts delivery of the packets to the MN 1 at S 719 .
  • the tunnel with the MAGa 2 is also deleted, thus making it possible to release a source of the MAG effectively.
  • FIG. 15 is a sequence diagram illustrating processing procedures in the present embodiment.
  • SIP Session Initiation Protocol
  • RTSP Real Time Streaming Protocol
  • the MN 1 sends an SIP-Bye or an RTSP-TEARDOWN message to a communication partner for communication termination.
  • the Netlmm control means 7 of the MAGb 3 Since the Netlmm control means 7 of the MAGb 3 is to relay this massage to the communication partner, upon receipt of this message, the MN 1 is specified from a source address and the like to obtain an MN-ID as an identifier of the MN 1 . In addition, the message itself is transferred in accordance with a protocol for IP communication.
  • the Netlmm control means 7 of the MAGb 3 Upon receipt of the MN-ID, at S 802 , the Netlmm control means 7 of the MAGb 3 refers to the routing table concerning the MN-ID in the storage portion 8 , confirms a transfer state, detects that a tunnel is held between the MAGb 3 and the MAGa 2 , and, at S 803 , sends a tunnel deletion instruction notification to the MAGa 2 .
  • the Netlmm control means 7 of the MAGb 3 sends a deletion notification for the MAG-MAG tunnel to the LMA 4 .
  • This tunnel deletion notification includes the MAGa-ID, the MAGb-ID and the MN-ID, and is associated with information showing deletion of the MAG-MAG tunnel.
  • the Netlmm control means 7 of the MAGa 2 deletes tunnel setting between the MAGa 2 and the MAGb 3 from the routing table in the storage portion 8 , and sends a tunnel deletion Ack for confirmation to the MAGb 3 .
  • the MAGa 2 may send the MAG-MAG tunnel deletion notification to the LMA 4 . In this deletion notification, information is described as described above.
  • the procedure to send such a tunnel deletion notification to the LMA 4 can be omitted.
  • information of the MAG-MAG tunnel deletion as described above may be added to the location registration that is sent from the MAGb 2 to the LMA 4 .
  • a message for communication termination sent from the MN is received by an MAG at a movement destination link that performs relaying, by using this as a trigger, the MAG at a movement destination can send to the MAG at a movement source a deletion instruction notification for tunnel setting that has been used for transferring, thus making it possible to release a resource of the MAG effectively.
  • FIG. 16 is a sequence diagram illustrating processing procedures in the present embodiment.
  • the MN 1 can not notify the MAG of communication termination in a session layer, thus a method like in the eighth embodiment is unusable.
  • the Netlmm control means 7 of the MAG uses means such as a neighbor discovery (ND, Neighbor Discovery, RFC2461) to detect that the MN 1 is not in its own link at S 901 .
  • ND Neighbor Discovery
  • the Netlmm control means 7 of the MAGb 3 grasps an MN-ID as an identifier of the disappeared MN 1 from the routing table in the storage portion 8 and grasps a transfer state of this MN 1 .
  • the Netlmm control means 7 of the MAGb 3 grasps that a transfer state by tunneling with the MAGa 2 is held, and at S 903 , notifies the MAGa 2 of that a tunnel for packets concerning the MN 1 is to be deleted.
  • the Netlmm control means 7 of the MAGb 3 sends a deletion notification of the MAG-MAG tunnel to the LMA 4 .
  • the tunnel deletion notification includes the MAGa-ID, the MAGb-ID, and the MN-ID, and is associated with information showing deletion of the MAG-MAG tunnel.
  • the Netlmm control means 7 of the MAGa 2 Upon receipt of the instruction notification for tunnel deletion, the Netlmm control means 7 of the MAGa 2 deletes tunnel setting with the MAGb 3 from the routing table of the storage portion 8 , and at S 905 , returns a tunnel deletion Ack to the MAGb 3 .
  • the MAGa 2 may send the MAG-MAG tunnel deletion notification to the LMA 4 . In this deletion notification, information is described as described above.
  • the procedure to send such a tunnel deletion notification to the LMA 4 can be omitted.
  • information of the MAG-MAG tunnel deletion as described above may be added to the location deregistration that is sent from the MAGb 3 to the LMA 4 .
  • the MAG that has been in the same link with the MN until then sends a tunnel deletion instruction notification to the partner MAG that has performed tunnel setting for transfer for the MN, thus making it possible to release a resource of the MAG effectively.
  • FIG. 17 is a view illustrating the schematic structure of a network in the present embodiment.
  • FIG. 18 is a sequence diagram in the present embodiment.
  • the Proxy Mobile IP system is a system in which using an AAA (Authentication Authorization Accounting, authentication, authorization, accounting) server that performs an authentication and the like, the MAG carries out a proxy (proxy) function of the MN in the Mobile IP.
  • AAA Authentication Authorization Accounting, authentication, authorization, accounting
  • An AAA server 41 and the LMA 4 in the Proxy Mobile IP system are connected through a network (Network) 42 .
  • the MN 1 sends information for authentication to the MAGc 31 which is an MAG of a new link as usual.
  • This information is considered to use an EAP (Extensible Authentication Protocol) and the like.
  • This authentication request includes an MN-ID as an identifier of the MN 1 .
  • the MAGc 31 that has received the authentication request from the MN 1 sends authentication information to the AAA server 41 at S 1002 .
  • the authentication information includes the MN-ID.
  • the AAA server 41 that has received the authentication request from the MAGc 31 searches data base provided in the server with the MN-ID as a key to determine whether to authorize the authentication.
  • information of the MN 1 including home address information of the MN 1 and address information of the LMA 4 in data base is sent to the MAGc 31 as a policy profile at S 1003 .
  • the MAGc 31 that has received the authentication authorization/policy profile creates a Proxy BU (Binding Update) based on information obtained from the policy profile to send to the LMA 4 .
  • Proxy BU Policy Update
  • the LMA 4 that has received the Proxy BU sends a buffer transfer/tunnel deletion instruction notification including address information of the MAGc 31 to the MAGb 3 which is an MAG belonged before movement at S 1005 .
  • the MAGb 3 that has received the buffer transfer/tunnel deletion instruction notification sends a tunnel generation instruction notification to the MAGc 31 at S 1006 .
  • the MAGc 31 that has received the tunnel generation instruction notification from the MAGb 3 generates a tunnel from the MAGb 3 to the MAGc 31 and sends a tunnel generation Ack to the MAGb 3 at S 1007 .
  • the MAGb 3 that has received the tunnel generation Ack transfers data addressed to the MN 1 stored in the buffer of the MAGc 31 at S 1008 . Further, at S 1009 , the MAGb 3 breaks the tunnel between the LMA 4 and the MAGb 3 with the LMA 4 and sends a tunnel deletion Ack to the LMA 4 .
  • the LMA 4 that has received the tunnel deletion Ack sends a Proxy BAck (Binding Update Acknowledgement) to the MAGc 31 at S 1010 .
  • Proxy BAck Biting Update Acknowledgement
  • the MAGb 3 sends a tunnel deletion instruction notification to the MAGa 2 .
  • the MAGa 2 that has received the tunnel deletion instruction notification from the MAGb 3 deletes the tunnel between the MAGa 2 and the MAGb 3 , and at S 1012 , sends a tunnel deletion Ack to the MAGb 3 .
  • the MAGc 31 that has received the Proxy BAck from the LMA 4 sends information for an address configuration such as an RA and a DHCP Advertise to the MN 1 at S 1013 .
  • the MN 1 that has received address configuration information from the MAGc 31 performs an NA (DAD) at S 1014 .
  • the MAGc 31 starts transfer of the packets addressed to the MN 1 to the MN 1 at S 1015 .
  • FIG. 19 is a view illustrating the schematic structure of a network in the present embodiment.
  • FIG. 20 is a sequence diagram in the present embodiment.
  • the MN 1 moves from a link of the MAGa 2 to a link of the MAGb 3 .
  • the MAGb 3 generates a tunnel with the LMA 4 and thereafter sends an instruction notification for tunnel generation and buffer transfer to the MAGa 2 .
  • the MAGa 2 sends an instruction notification for tunnel deletion to the MAGb 3 when there is no buffer.
  • the MN 1 sends information for authentication to the MAGb 3 which is an MAG of a new link as usual. This information is considered to use an EAP and the like.
  • This authentication request includes an MN-ID as an identifier of the MN 1 .
  • the MAGb 3 that has received the authentication request from the MN 1 sends authentication information to the AAA server 41 at S 1102 .
  • the authentication information includes the MN-ID.
  • the AAA server 41 that has received the authentication request from the MAGb 3 searches data base with the MN-ID as a key to determine whether to authorize the authentication.
  • information of the MN 1 including home address information of the MN 1 and address information of the LMA 4 in data base is sent to the MAGb 3 as a policy profile at S 1103 .
  • the MAGb 3 that has received the authentication authorization/policy profile from the AAA server creates a Proxy BU based on information obtained from the policy profile to send to the LMA 4 .
  • the LMA 4 that has received the Proxy BU from the MAGb 3 returns a Proxy BAck to the MAGb 3 at S 1105 .
  • the Proxy BAck includes address information of the MAGa 2 which is an MAG before the handover. With this Proxy BAck, a tunnel between the LMA 4 and the MAGb 3 is generated.
  • the MAGb 3 that has received the Proxy BAck from the LMA 4 generates the tunnel between the LMA 4 and the MAGb 3 , and at S 1106 , packet transfer from the LMA 4 to the MAGb 3 is started.
  • the MAGb 3 further generates a Proxy FBU (Fast Binding Update) based on information obtained from the Proxy BAck to send it to the MAGa 2 .
  • Proxy FBU Fest Binding Update
  • the MAGa 2 that has received the Proxy FBU from the MAGb 3 generates a Proxy FBAck to send it to the MAGb 3 .
  • the MAGa 2 starts buffer transfer of packets addressed to the MN 1 at S 1109 .
  • the buffer of the packets addressed to the MN 1 in the MAGa 2 disappear when transferred to the MAGc 31 .
  • the MAGa 2 sends a tunnel deletion instruction notification to the MAGb 3 at S 1110 .
  • the MAGb 3 that has received the tunnel deletion instruction notification from the MAGa 2 deletes the tunnel from the MAGa 2 to the MAGb 3 and sends a tunnel deletion Ack to the MAGa 2 . Further, as a result of receiving the tunnel deletion instruction notification, the MAGb 3 can determine that all of the packets to be transferred to the MN 1 have been received. Hence, at S 1112 , an RA for an address configuration is sent to the MN 1 .
  • the MAGa 2 that has received the tunnel deletion Ack from the MAGb 3 deletes the tunnel from the MAGa 2 to the MAGb 3 .
  • the MN 1 that has received the RA from the MAGb 3 performs an NA (DAD) for a duplicate address confirmation at S 1113 . Note that, this step can be omitted.
  • the MAGb 3 starts transfer of the packets addressed to the MN 1 to the MN 1 at S 1114 .
  • the MAG at a movement destination of the MN 1 generates the tunnel with the LMA and thereafter sends an instruction notification for tunnel generation and buffer transfer to an MAG at a movement source, thus making it possible to perform a handover without loss in packets.
  • the MAG at a movement source sends an instruction notification for tunnel deletion to the MAG at a movement destination when there is no buffer, thus making it possible to perform release of a resource of the MAG efficiently.
  • a communication system using a network IP mobility protocol of the present invention a control apparatus, a router and a communication method thereof will not be limited to the above-described examples shown in the drawings, and various modifications may be certainly made within the scope of the present invention.
  • a communication system using a network IP mobility protocol of the present invention, a control apparatus, a router and a communication method thereof are capable of eliminating loss in packets during handover and releasing a resource of a router effectively in a network base IP mobility protocol where a mobile terminal is movable without mounting a special protocol.

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EP2134110B1 (de) 2012-10-17
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CN102638786A (zh) 2012-08-15
KR20090057267A (ko) 2009-06-04
JP2009296616A (ja) 2009-12-17
JP4950204B2 (ja) 2012-06-13
JP5291817B2 (ja) 2013-09-18
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JP5592975B2 (ja) 2014-09-17
EP2477425A1 (de) 2012-07-18
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EP2134110A1 (de) 2009-12-16
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US20090290529A1 (en) 2009-11-26
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EP2068507A4 (de) 2009-12-09
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USRE45465E1 (en) 2015-04-14
US20150172960A1 (en) 2015-06-18
KR101298080B1 (ko) 2013-08-20
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CN101536432A (zh) 2009-09-16
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EP2068507B1 (de) 2012-07-04
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US8325677B2 (en) 2012-12-04
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