JP2007215231A - Mobile communication system, method, device, and control program - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology in which an HA can hold the registration information of an MR efficiently and communication efficiency is enhanced at the time of registration/update processing between the HA and the MR. <P>SOLUTION: A mobile node has a representative home address, an auxiliary home address and a care-of address and registers information (joint information) indicative of a relation of the representative home address, all auxiliary home addresses and the care-of address for a home agent HA113 every time when the mobile node moves to the other network and is assigned with a new care-of address. The home agent HA113 receives a registration request of the joint information and stores registration information, and when a packet addressed to a representative home address or an arbitrary auxiliary home address from an arbitrary communication node arrives, the home agent retrieves the joint information including the address from the registration information held therein and then transfers the packet to a corresponding care-of address. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to communication using a mobile network, and more particularly to a technique for assigning a global address.

  Mobile IP is a technique for continuing communication without changing the IP address when moving within a network during communication using IP (see Non-Patent Document 1).

“IP Mobility Support for IPv4”, RFC3344, Aug., 2002.

  The mobile node (MN) notifies the HA (Home Agent) existing in the home network of the MN as the CoA (Care-of-Address) as the address acquired when connecting to the network, and the HA acts as a proxy for the packet addressed to the MN. By receiving and transferring, the MN can communicate using a HoA (Home Address) that is used when the MN exists in the home network.

  Furthermore, when the MN functions as a local network router, it operates as follows.

  When a communication terminal MNN (Mobile Network Node) is connected to a network managed by the MN, the MNN acquires an address managed by the MN by DHCP or PPP. The MN notifies the assigned address to the HA, and the HA registers to transfer the packet addressed to the assigned address.

  However, the conventional technique has a problem that when the MN registers a plurality of addresses in the HA as the HoA, the HA has registration information more than necessary, which is inefficient.

  In addition, the registration / update process between HA and MN had to be performed independently for each HoA, which was inefficient.

  Therefore, the present invention has been invented in view of the above problems, and its purpose is that the HA can efficiently hold the registration information of the MR, and the registration / update process between the HA and MR can be performed. Another object of the present invention is to provide a mobile communication system capable of improving the communication efficiency, and an apparatus and a control program used therefor.

A first invention for achieving the above object is a mobile communication system including a home agent, a mobile node, and one or more communication nodes,
The mobile node is
Means for storing a pre-assigned representative home address, zero or more pre-assigned auxiliary home addresses, and a care-of address temporarily assigned in the current network;
Means for requesting registration of binding information, which is information related to a representative home address, all auxiliary home addresses, and care-of addresses, every time a new care-of address is assigned after moving to another network And
The home agent
A table in which the join information is registered in response to the join information registration request;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, search for binding information including the representative home address or the auxiliary home address, and forward the packet to the care-of address corresponding to the address. And means for carrying out the above.

According to a second invention for achieving the above object, in the first invention, the mobile node registers a part of the auxiliary home address possessed during the registration process of the binding information and the remaining unregistered Means to manage as an auxiliary home address;
A means for requesting the home agent to additionally register an unregistered auxiliary home address at any time;
Means for requesting deregistration of the registered auxiliary home address,
The home agent
When the mobile node is requested to register additional auxiliary home address, means for adding the address to the binding information of the corresponding mobile node;
Means for canceling the registration of the auxiliary home address when requested to delete the address from the binding information of the corresponding mobile node;
Of the auxiliary home addresses owned by the mobile node, the number of auxiliary home addresses to be used can be dynamically changed.

According to a third invention for achieving the above object, in the first and second inventions, the mobile node is:
Means for requesting the home agent to assign a new auxiliary home address;
A means for returning the assigned auxiliary home address;
The home agent
When an assignment of a new auxiliary home address is requested from the mobile node, an arbitrary address is selected from the unassigned address group that is held, and this address is registered in the mobile node binding information, and at the mobile node. A means of notification;
When the assigned auxiliary home address is returned from the mobile node, it is returned to the unassigned address and has a means for deleting it from the binding information of the mobile node,
The mobile node is configured to be able to dynamically change the number of auxiliary home addresses owned by the mobile node.

According to a fourth invention for achieving the above object, in the first to third inventions, a plurality of mobile network nodes are arranged under the mobile node, and these constitute a local network having the mobile node as a router. And
The mobile node has a means for assigning an auxiliary home address to the mobile network node, and forwarding a packet addressed to the auxiliary home address assigned to the mobile network node to a corresponding mobile network node when the mobile node arrives. The node is configured to perform location registration for a mobile network node of a local network to be managed on behalf of the node and transfer a packet addressed to the mobile network node.

According to a fifth invention for achieving the above object, in the fourth invention, a new mobile network node is added in the local network, and the mobile network node assigns an address to the mobile node. If requested, an arbitrary unregistered auxiliary home address is assigned to the mobile network node, and the home agent is requested to additionally register this auxiliary home address, and the mobile network node is deleted from within the local network, and the mobile When the network node notifies the mobile node of the return of the auxiliary home address, the mobile node has means for requesting the home agent to deregister the auxiliary home address;
The mobile network node is configured to dynamically increase or decrease the number of registered auxiliary home addresses owned by the mobile node in accordance with addition or deletion of the mobile network node.

According to a sixth invention for achieving the above object, in the fourth invention, a new mobile network node is added to the mobile node in the local network managed by the mobile node, and the mobile network node is connected to the mobile node. Requesting an address assignment, a new auxiliary home address is obtained from the home agent and assigned to the mobile network node;
Means for returning the auxiliary home address to the home agent when the mobile network node is deleted from the local network managed by the mobile node and the mobile network node notifies the mobile node of the return of the auxiliary home address;
The mobile network node is configured to dynamically increase or decrease the number of auxiliary home addresses owned by the mobile node in accordance with addition or deletion of the mobile network node.

  In a seventh invention that achieves the above object, in the first to sixth inventions, the mobile node registers, updates, or deletes a representative home address and an arbitrary number of auxiliary home addresses simultaneously with a home agent. In the case of performing such an operation, it is characterized by having means for collecting information on all addresses in one message and transmitting it to the home agent.

An eighth invention for achieving the above object is a mobile node in a mobile communication system comprising a home agent, a mobile node, and one or more communication nodes,
Means for storing a pre-assigned representative home address, zero or more pre-assigned auxiliary home addresses, and a care-of address temporarily assigned in the current network;
Means for requesting registration of binding information, which is information related to a representative home address, all auxiliary home addresses, and care-of addresses, every time a new care-of address is assigned after moving to another network It is characterized by having.

According to a ninth aspect of the invention for achieving the above object, in the eighth aspect of the invention, at the time of registration processing of the combined information, a part of the owned auxiliary home address is registered and the remaining is managed as an unregistered auxiliary home address. Means to
A means for requesting the home agent to additionally register an unregistered auxiliary home address at any time;
And a means for requesting deregistration of the registered auxiliary home address.

In a tenth aspect of the invention for achieving the above object, in the eighth and ninth aspects, means for requesting the home agent to assign a new auxiliary home address;
And a means for returning the assigned auxiliary home address.

In an eleventh invention for achieving the above object, in the eighth to tenth inventions, an arbitrary auxiliary home address is assigned to a plurality of subordinate mobile network nodes, and a packet addressed to the auxiliary home address assigned to the mobile network node is If it arrives, it has means to forward it to the corresponding mobile network node,
The present invention is characterized in that location registration for a mobile network node of a local network to be managed is performed as a proxy, and a packet addressed to the mobile network node is transferred.

According to a twelfth aspect of the present invention for achieving the above object, in the eleventh aspect, when a new mobile network node is added in the local network and the mobile network node requests an address assignment, any unregistered auxiliary The home address is assigned to the mobile network node, and the home agent is requested to additionally register the auxiliary home address, the mobile network node is deleted from within the local network, and the mobile network node notifies the return of the auxiliary home address. If there is a means for requesting the home agent to deregister the auxiliary home address,
According to the present invention, the number of registered auxiliary home addresses is dynamically increased or decreased according to addition or deletion of mobile network nodes.

In a thirteenth invention for achieving the above object, in the above-mentioned eleventh invention, when a new mobile network node is added in the local network to be managed and the mobile network node requests address assignment, a new auxiliary home is provided. Means for obtaining an address from a home agent and assigning it to a mobile network node;
When the mobile network node is deleted from within the local network to be managed and the mobile network node notifies the return of the auxiliary home address, the mobile network node has means for returning the auxiliary home address to the home agent,
It is characterized in that the number of auxiliary home addresses owned is dynamically increased or decreased in accordance with addition or deletion of mobile network nodes.

  In a fourteenth aspect that achieves the above object, in the eighth to thirteenth aspects, the representative home address and an arbitrary number of auxiliary home addresses are simultaneously registered, updated, or deleted from the home agent. In this case, the information processing apparatus is characterized by having means for collecting information on all addresses in one message and transmitting the information to the home agent.

A fifteenth invention for achieving the above object is a home agent in a mobile communication system comprising a home agent, a mobile node, and one or more communication nodes,
A request for registration of binding information, which is information related to the representative home address of the mobile node, the plurality of auxiliary home addresses that the mobile node has, and the care-of address temporarily assigned to the mobile node in the network in which the mobile node is present. A table received from the mobile node and registered with this join information;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, binding information including the representative home address or the auxiliary home address is searched from the table, and a care-of address corresponding to the address is assigned. And a means for transferring a packet.

In a sixteenth aspect of the present invention that achieves the above object, in the fifteenth aspect of the present invention, when a mobile node is requested to register an additional auxiliary home address, means for adding the address to the binding information of the corresponding mobile node;
In the case of requesting deregistration of the auxiliary home address, it further comprises means for deregistering the address from the binding information of the corresponding mobile node.

According to a seventeenth aspect of the invention for achieving the above object, in the fifteenth and sixteenth aspects of the invention, when a mobile node is requested to assign a new auxiliary home address, an arbitrary address from an unassigned address group that is held Means for registering this address in the binding information of the mobile node and notifying the mobile node;
In the case where the allocated auxiliary home address is returned from the mobile node, the mobile node is further returned to an unallocated address, and further includes a means for deleting this from the connection information of the mobile node.

An eighteenth invention for achieving the above object is a mobile node control program in a mobile communication system comprising a home agent, a mobile node, and one or more communication nodes.
The control program allows the mobile node to
Means for storing a pre-assigned representative home address, zero or more auxiliary home addresses pre-assigned, and a care-of address temporarily assigned in the current network;
As a means for requesting registration of binding information, which is information related to the representative home address, all auxiliary home addresses, and care-of addresses, whenever a new care-of address is assigned after moving to another network. It is made to function.

In a nineteenth aspect of the invention for achieving the above object, in the eighteenth aspect of the invention, the control program causes the mobile node to
Means for registering a part of the owned auxiliary home address and managing the remaining as an unregistered auxiliary home address during the registration of the binding information;
A means for requesting the home agent to additionally register an unregistered auxiliary home address at any time;
It further functions as means for requesting deregistration of the registered auxiliary home address.

In a twentieth invention that achieves the above object, the control program causes the mobile node to
Means for requesting the home agent to assign a new auxiliary home address;
A means for returning the assigned auxiliary home address is further functioned.

In a twenty-first invention that achieves the above object, in the eighteenth to twentieth inventions, the control program causes the mobile node to
An arbitrary auxiliary home address is assigned to a plurality of subordinate mobile network nodes, and when a packet addressed to the auxiliary home address assigned to the mobile network node arrives, it is made to function as a means for transferring the packet to the corresponding mobile network node. Features.

In a twenty-second invention that achieves the above object, in the twenty-first invention, the control program causes the mobile node to
When a new mobile network node is added in the local network and the mobile network node requests an address assignment, it assigns any unregistered auxiliary home address to the mobile network node and When requesting additional registration of home address, the mobile network node is deleted from the local network, and the mobile network node notifies the return of the auxiliary home address, the home agent is requested to deregister the auxiliary home address. It is made to function as a means to do.

In a twenty-third invention that achieves the above object, in the twenty-first invention, the control program causes the mobile node to
When a new mobile network node is added in the local network to be managed, and the mobile network node requests an address assignment, means for obtaining a new auxiliary home address from the home agent and assigning it to the mobile network node;
When the mobile network node is deleted from the managed local network and the mobile network node notifies the return of the auxiliary home address, the mobile network node functions as means for returning the auxiliary home address to the home agent.

According to a twenty-fourth aspect of the invention for achieving the above object, in the eighteenth to twenty-third aspects of the invention, the control program causes the mobile node to
When registering, updating, or deleting a representative home address and any number of auxiliary home addresses at the same time with the home agent, information on all addresses is collected in one message and sent to the home agent. It is made to function as a means.
A twenty-fifth aspect of the invention for achieving the above object is a control program for a home agent in a mobile communication system comprising a home agent, a mobile node, and one or more communication nodes.
The control program sends the home agent,
A request for registration of binding information, which is information related to the representative home address of the mobile node, the plurality of auxiliary home addresses that the mobile node has, and the care-of address temporarily assigned to the mobile node in the network in which the mobile node is present. Means for receiving from the mobile node and storing this binding information;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, search for binding information including the representative home address or the auxiliary home address from the stored binding information, and correspond to that address. It functions as a means for transferring a packet to a care-of address.

In a twenty-sixth aspect of the present invention that achieves the above object, in the twenty-fifth aspect, the control program causes the home agent to
When the mobile node is requested to register additional auxiliary home address, means for adding the address to the binding information of the corresponding mobile node;
When deregistration of the auxiliary home address is requested, it is made to function as means for deleting the address from the binding information of the corresponding mobile node.

According to a twenty-seventh aspect of the invention for achieving the above object, in the twenty-fifth and twenty-sixth aspects of the invention, the control program sets the home agent,
When an assignment of a new auxiliary home address is requested from the mobile node, an arbitrary address is selected from the unassigned address group that is held, and this address is registered in the mobile node binding information, and at the mobile node. A means of notification;
When the assigned auxiliary home address is returned from the mobile node, it is returned to the unassigned address and functions as means for deleting this from the connection information of the mobile node.

A twenty-eighth aspect of the invention for achieving the above object is an address management method in a mobile communication system comprising a home agent, a mobile node, and one or more communication nodes, wherein the mobile node is temporarily assigned. When a care-of address is newly assigned by moving to another network, the relationship between the newly assigned care-of address, a pre-assigned representative home address, and zero or more pre-assigned auxiliary home addresses Requesting the home agent to register the binding information which is the information of
A home agent receiving a registration request for the binding information from the mobile node and storing the binding information;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, the home agent searches the binding information storing the binding information including the representative home address or the auxiliary home address, and performs this binding. Obtaining a care-of address corresponding to the address based on the information, and transferring the packet to the care-of address.

In a twenty-ninth aspect of the present invention that achieves the above object, in the twenty-eighth aspect, the mobile node does not register a part of the owned auxiliary home address with the home agent at the time of registration processing of binding information, but does not register When an additional auxiliary home address is required, the home agent is requested to register an additional unregistered auxiliary home address, and when the registered auxiliary home address is no longer needed, the home agent is requested. In response to the request to unregister the registered auxiliary home address,
In accordance with the registration request of the home agent, the home agent performs additional registration or deregistration of the auxiliary home address of the binding information of the corresponding mobile node,
Among the auxiliary home addresses owned by the mobile node, the number of auxiliary home addresses to be used can be dynamically changed.

According to a thirtieth aspect of the present invention for achieving the above object, in the above twenty-eighth and twenty-ninth aspects, the home agent has an unassigned address, and when the mobile node is requested to assign a new auxiliary home address, The mobile node obtains a new auxiliary home address by selecting an arbitrary address from the assigned unassigned addresses, registering this address in the binding information of the mobile node, and notifying the mobile node.
When the mobile node no longer needs the auxiliary home address, the mobile node returns the auxiliary home address to the home agent, and the home agent deletes the auxiliary home address from the binding information, so that the mobile node owns the auxiliary home address. It is configured so that the number can be changed dynamically.

  According to the present invention, the HA can efficiently hold the MR registration information.

  In addition, information related to all addresses is collected in one message and transmitted to the home agent, so that the communication efficiency during the HA-MR registration / update process is improved.

  The present invention relates to a mobile communication system composed of a home agent, a mobile node, and one or more communication nodes. The mobile node has a representative home address, an auxiliary home address, and a care-of address, and other networks. Each time a new care-of address is assigned, information (association information) indicating the relationship between the representative home address, all auxiliary home addresses, and the care-of address is registered with the home agent.

  The home agent receives the registration request for the binding information, stores the registration information, and when a packet addressed to the representative home address or any auxiliary home address arrives from any communication node, The binding information including the address is searched, and the packet is forwarded to the corresponding care-of address.

  Here, the representative home address is a home address assigned in advance to the mobile node, such as HoA (Home Address).

  The auxiliary home address is an address that the mobile node assigns to a communication terminal MNN (Mobile Network Node) of the network under management, and a plurality of mobile nodes have.

  The care-of address is an address temporarily assigned in the network in which the mobile node is present, and is, for example, CoA (Care-of-Address).

  As described above, the mobile node communicates using a plurality of home addresses (representative home address, auxiliary home address, and care-of address). That is, one mobile node has one representative home address associated with the care-of address and a plurality of auxiliary home addresses associated with the representative home address. By searching for this association, a small amount of registration information can be obtained. It is communicating with.

  Hereinafter, specific examples will be described. In the following embodiments, HoA (Home Address) is taken as an example of the representative home address, additional address is taken as an example of the auxiliary home address, and CoA (Care-of-Address) is taken as an example of the care-of address.

  A first embodiment of the present invention will be described.

  FIG. 1 is a diagram showing a network configuration to which the present invention is applied. Referring to FIG. 1, the present invention comprises a mobile network 101 and the Internet 102.

  The Internet 102 has a network configuration including an arbitrary number of MNs (Mobile Node, only MN-1 is shown in the figure), HA (Home Agent), and CN (Correspondent Node). MN-1 registers CoA with HA using MobileIP, and when a packet addressed to MN-1 arrives on the network, HA transfers it to CoA of MN-1.

  The mobile network 101 has a network configuration including MN-1 and an arbitrary number of MNNs (Mobile Network Node, only MNN-1 is shown in the figure). An example of the mobile network 101 is a network constructed in a vehicle such as a train or a car. MN-1 operates as an MR (Mobile Router) having a router function for the Internet 102. In the following description, an MN having an MR function is represented as MR. MNN-1 and CN communicate with MN-1 (MR) via HA.

  Next, the configuration of the MR 112 (mobile router) will be described.

  FIG. 2 is a block diagram of the MR 112.

  The MR 112 includes an input / output terminal 301 connected to the mobile network 101, a communication interface 303 input / output to / from the input / output terminal 301, an input / output terminal 302 connected to the Internet, and a communication interface input / output to the input / output terminal 302. 304, a packet classification unit 324 that classifies input packets from the Internet, a packet analysis unit 323 that analyzes the classified signaling packet, a signaling packet generation unit 322 that generates a signaling packet to be transmitted to the MNN, and a capsule A decapsulation unit 321 that decapsulates the packet, a storage unit 325 that stores information, a movement management / address acquisition unit 326 that detects movement of the mobile network 101 and acquires a new address, and a mobile network Or A packet classification unit 311 classifies the incoming packets, the signaling packet generation unit 313 for generating a signaling message addressed HA113, composed of the encapsulation unit 312. encapsulating the packet. Note that it is sufficient that at least one communication interface exists, and a configuration in which a plurality of communication interfaces are provided and used at the same time may be used. Each of the above units can also be configured by a CPU or the like that operates according to a control program.

  Next, the configuration of the HA 113 (home agent) will be described.

  FIG. 3 is a block diagram of the HA 113.

  The HA 113 has an input / output terminal 401 to the Internet, a communication interface 411 that inputs / outputs to the input / output terminal 401, a packet classification unit 412 that classifies an input packet, and analyzes contents when the input packet is a signaling packet. Packet analyzing unit 415 that performs address allocation when there is an address allocation request for MNN, storage unit 416 that stores information, signaling packet generation unit 418 that returns a response to signaling, and packet encapsulation An encapsulating unit 414 for decomposing, and a decapsulating unit 413 for decapsulating the encapsulated packet. Each of the above units can also be configured by a CPU or the like that operates according to a control program.

  Next, the operation in the above configuration will be described with reference to the drawings.

  FIG. 4 is a diagram showing a communication sequence, FIG. 5 is a diagram showing an example of an MNN management table held by MR, and FIG. 6 is a diagram showing an example of MR management table held by HA.

  First, a message transmission / reception sequence will be described with reference to FIG.

  In the present invention, as shown in FIG. 4, the CoA registration process 291 that is registered in the HA when the MR acquires the CoA, and the global address registration that is performed by the MR at an original timing or triggered by an address request from the MNN Processing 292, data communication processing 293 for performing data communication between the MNN and CN, CoA update processing 294 for updating the MR entry registered in the HA, and global address triggered by an address release request from the MNN The address release process 295 and the CoA deletion process 296 for deleting the registration of the MR itself are roughly divided.

  First, the CoA registration process 291 will be described.

  In the MR 112, the mobility management / address acquisition unit 326 acquires an address from the communication interface 304 connected to the Internet by processes such as DHCP protocol, PPP automatic line connection, and IPv6 address automatic generation processing. The acquired address is CoA. Next, the signaling packet generation unit 313 generates a registration request signaling packet including the CoA (Care-of-Address) and HoA (Home Address) addressed to the HA 113, and sends it to the communication interface 304. hand over. The communication interface 304 transmits the registration request packet 201 to the HA 113 via the input / output terminal 302.

  When the registration request packet 201 reaches the HA 113, it reaches the packet classification unit 412 via the input / output terminal 401 and the communication interface 411. The packet classification unit 412 identifies that the received packet is the registration request packet 201 and passes the registration request packet 201 to the packet analysis unit 415. The packet analysis unit 415 refers to the storage unit 416 and confirms that there is no corresponding MR entry. The packet analysis unit 415 associates HoA and CoA, records them in the management table of the storage unit 416, and sets a timer for automatically deleting entries. FIG. 6 shows an example of the MR management table. Further, in order to respond to the MR 112 that registration has been completed normally, the signaling packet generator 418 is caused to generate a signaling packet for confirmation response (confirmation response packet 202). The signaling packet generation unit 418 passes the confirmation response packet 202 to the communication interface 411. The communication interface 411 transmits the confirmation response packet 202 to the MR 112 via the input / output terminal 401.

  When the MR 112 receives the confirmation response packet 202 from the input / output terminal 302 and the communication interface 304, the MR 112 identifies that the packet is a signaling packet by the packet classification unit 324 and passes the packet to the packet analysis unit 323. The packet analysis unit 323 analyzes the reception confirmation response packet to confirm that the registration is successful, and discards the confirmation response packet 203.

  Next, the global address registration process 292 will be described.

  The types of addresses that the MNN 111 has include a global address that is unique even outside the mobile network, and a private address that the MR 112 assigns to the MNN 111 in the mobile network using NAT. However, in the former case, it is assumed that routing is performed with a global address outside the mobile network, but there may be a case where a private address is used in a range such as within the operator network. In this case, it becomes a unique private address, but since it does not affect the present invention, it is a global address hereinafter.

  Of these, the former case can be divided into a case where an address statically assigned to the MNN is used (Case A) and a case where the address is dynamically acquired from a server in the Internet (Case B). However, in either case, the following global address registration processing is performed. In the latter case, the private address is used when the mobile network is connected, and the global address registration process is performed when a global address is required later (case C).

  In the global address registration processing 292, address request processing is first performed using an address request packet 211 transmitted from the MNN 111 to the MR 112. However, this request is not necessarily one message. For example, in case A, when a packet is transmitted for the first time, processing using a protocol such as DHCP is used in case B, processing using PPPoE is used in case C, and the like.

  In the MR 112, when the communication interface 303 receives the address request 211 from the MNN 111 via the input / output terminal 301, the packet classification unit 311 identifies that it is an address request message and notifies the signaling packet generation unit 313. Is done. This signaling packet generation unit 313 generates a signaling packet (registration request packet 212) including a transmission source address in case A and a DHCP request in cases B and C depending on the address acquisition method of MNN 111. The registration request packet 212 is transmitted to the HA 113 via the communication interface 304 and the input / output terminal 302.

  When the registration request packet 212 reaches the HA 113, it reaches the packet classification unit 412 via the input / output terminal 401 and the communication interface 411 in the HA 113. The packet classification unit 412 identifies that the received packet is the registration request packet 212 and passes the registration request packet 212 to the packet analysis unit 415. The packet analysis unit 415 refers to the storage unit 416 and recognizes that the message is for the CoA and HoA of the MR 112 that already exists. Next, it is confirmed whether it is a static address registration or a dynamic address acquisition request. If it is a dynamic address acquisition request, an address to be allocated to the MNN 111 is acquired from the address allocation unit 417. Next, an existing address is registered as an additional address in the management table of the storage unit 416. For example, when the MR management table of FIG. 6 is held, it is written in the additional address column. Further, in order to respond to the MR 111 that the registration has been normally completed, the signaling packet generation unit 418 is instructed to generate a confirmation response signaling packet (acknowledgment packet 213).

  The signaling packet generation unit 418 passes the confirmation response packet 213 to the communication interface 411. The communication interface 411 transmits an acknowledgment packet 213 to the MR 112 via the input / output terminal 401.

  When the MR 112 receives the confirmation response packet 213 from the input / output terminal 302 and the communication interface 304, the MR 112 identifies that the packet is a signaling packet by the packet classification unit 324 and passes it to the packet analysis unit 323. The packet analysis unit 323 analyzes the reception confirmation response packet and confirms that the registration is successful, records the address of the MNN 111 and the MAC address in the storage unit 325 to be in a routable state, and discards the confirmation response packet 203. . It also instructs the signaling packet generator 322 to generate a signaling message (address assignment packet 214) corresponding to the address request packet 211 from the MNN 111. The signaling packet generation unit 322 passes the address assignment packet 214 to the communication interface 303. The communication interface 303 transmits the address assignment packet 214 to the MNN 111 via the input / output unit 301.

  Upon receiving the address assignment packet 214, the MNN 111 recognizes that the address has been registered normally. In particular, in cases B and C, the address to be used is notified, and then communication is performed using that address.

  However, if the MR 112 pools a certain number of global addresses in advance and the MNN 111 is closed in the mobile network when connecting to the mobile network and the address assignment process is completed, the MR holds it. Regarding the address, the above global address registration processing 292 may be performed simultaneously with the CoA registration processing 291.

  With the above processing, it is possible to save the storage capacity of the management table in the HA as compared with the case where addresses are registered independently.

  Next, processing during communication between the MNN 111 and the CN 114 will be described.

  First, the flow of packets from the MNN 111 toward the CN 114 will be described.

  A packet (packet A 221) having a destination of CN 114 and a transmission source of MNN 111 is transmitted from MNN 11 to packet classification unit 311 via input / output terminal 301 and communication interface 311 connected to the mobile network side of MR 112. To reach. The packet classification unit 311 recognizes that the packet is a data packet from the MNN 111 to the CN 114, passes the packet to the encapsulation unit 312, and the encapsulation unit 312 encapsulates the received packet. Specifically, a packet is generated in which the received packet A221 is used as a payload and the destination of the header portion is set to HA113. The encapsulation unit 312 passes the packet to the communication interface 304. The communication interface 304 transmits to the HA 113 via the input / output terminal 302.

  When the packet B 222 reaches the HA 113, the packet B 222 passes through the input / output terminal 401 and the communication interface 411 in the HA 113 and reaches the packet classification unit 412. The packet classification unit 412 recognizes that the received packet is a data communication packet from the MNN to the CN, and passes the packet B222 to the decapsulation unit 413. The decapsulation unit 413 removes the header of the passed packet and extracts the packet A223 in the payload part. The extracted packet A 223 is transferred to the CN 114 via the communication interface 411 and the input / output terminal 401.

  Next, a packet flow from CN 114 to MNN 111 will be described.

  When the packet C 224 transmitted from the CN 114 to the MNN 111 reaches the HA 113, it passes through the input / output terminal 401 and the communication interface 411 in the HA 113 and reaches the packet classification unit 413.

  The packet classification unit 413 identifies that the received packet is a data communication packet from the CN 114 to the MR 112, and passes the packet C224 to the encapsulation unit 414. The encapsulation unit 414 refers to the storage unit 416 and encapsulates the received packet. Specifically, a packet is generated in which the received packet C224 is used as a payload and the header part is set to MR112. The encapsulation unit 414 passes the generated packet D225 to the communication interface 411. The packet D225 is transferred to the MR 112 via the communication interface 411 and the input / output terminal 401.

  When MR 112 receives packet D 225 from input / output terminal 302 and communication interface 304, MR 112 identifies that the packet is a data packet addressed to MNN 111 by packet classification unit 324 and passes the packet to decapsulation unit 321. The decapsulation unit 321 removes the header of the passed packet and takes out the packet C226 in the payload portion. The extracted packet C226 is transferred to the MNN 111 via the communication interface 311 and the input / output terminal 301.

  The CoA update process 294 will be described.

  In the CoA registration process 291, the entry of the MR 112 registered in the HA 113 is automatically deleted when time elapses. Therefore, it is necessary to re-register at regular intervals to prevent this. The re-registration process is the CoA update process 294.

  In the MR 112, the signaling packet generator 313 sends a signaling packet (registration request packet) to the HA 113, including CoA, HoA, and a global address held by the MNN in the mobile network acquired by referring to the storage unit 325. 231) is generated and passed to the communication interface 304. The communication interface 304 transmits the registration request packet 231 to the HA 113 via the input / output terminal 302.

  When the registration request packet 231 reaches the HA 113, it reaches the packet classification unit 412 via the input / output terminal 401 and the communication interface 411. The packet classification unit 412 identifies that the received packet is the registration request packet 231, and passes the registration request packet 201 to the packet analysis unit 415. The packet analysis unit 415 refers to the storage unit 416 to search for the corresponding MR entry, and resets a timer for automatically deleting the entry. Further, in order to respond to the MR 112 that the registration has been completed normally, the signaling packet generator 418 is caused to generate a signaling packet for confirmation response (confirmation response packet 232). The signaling packet generation unit 418 passes the confirmation response packet 232 to the communication interface 411. The communication interface 411 transmits an acknowledgment packet 232 to the MR 112 via the input / output terminal 401.

  When the MR 112 receives the confirmation response packet 232 from the input / output terminal 302 and the communication interface 304, the MR 112 identifies that the packet is a signaling packet by the packet classification unit 324 and passes it to the packet analysis unit 323. The packet analysis unit 323 analyzes the reception confirmation response packet, confirms that the registration is successful, and discards the confirmation response packet 233.

  With the above processing, it is possible to update the associated address with one message, so that improvement in communication efficiency can be expected.

  Next, the global address release process 295 will be described.

  A global address release process 295 is performed when the MNN 111 that has registered an address by the global address registration process 292 stops using the global address, such as when leaving the mobile network.

  In the global address release processing 295, first, an address release request packet 241 is transmitted from the MNN 111 to the MR 112. This release request represents a process corresponding to the global address registration process and is not necessarily one message.

  In the MR 112, when the communication interface 303 receives the address release request 241 from the MNN 111 via the input / output terminal 301, the packet classification unit 311 next identifies that it is an address release request message, and the signaling packet generation unit 313. Will be notified. The signaling packet generation unit 313 generates a signaling packet (deletion request packet 242) for releasing an address corresponding to the address acquisition method of the MNN 111, and passes through the communication interface 304 and the input / output terminal 302, thereby deleting the deletion request packet 242. Is sent to the HA 113.

  When the deletion request packet 242 reaches the HA 113, it passes through the input / output terminal 401 and the communication interface 411 in the HA 113 and reaches the packet classification unit 412. The packet classification unit 412 identifies that the received packet is the deletion request packet 242, and passes the deletion request packet 242 to the packet analysis unit 415. The packet analysis unit 415 refers to the storage unit 416 and recognizes that the message is for the MR CoA and HoA that already exist.

  Next, the address requested to be deleted is deleted from the corresponding entry in the management table of the storage unit 416. Further, in order to respond to the MR 112 that the deletion has been normally completed, the signaling packet generation unit 418 is instructed to generate a confirmation response signaling packet (acknowledgment packet 243). The signaling packet generation unit 418 passes the confirmation response packet 243 to the communication interface 411. The communication interface 411 transmits an acknowledgment packet 243 to the MR 112 via the input / output terminal 401.

  When the MR 112 receives the confirmation response packet 243 from the input / output terminal 302 and the communication interface 304, the MR 112 identifies the packet as a signaling packet by the packet classification unit 324 and passes it to the packet analysis unit 323. The packet analysis unit 323 analyzes the reception confirmation response packet to confirm that the deletion is successful, deletes the corresponding entry from the storage unit 325, and discards the confirmation response packet 243.

  Further, it instructs the signaling packet generator 322 to generate a signaling message (completion notification packet 244) corresponding to the address request packet 241 from the MNN 111. The signaling packet generation unit 322 passes the completion notification packet 244 to the communication interface 303. The completion notification packet 244 reaches the MNN via the input / output unit 301.

  The CoA deletion process 296 will be described.

  When the MR ends the communication, a CoA deletion process 296 is performed.

  The signaling packet generator 313 generates a delete request packet 251 addressed to the HA 113 and passes it to the communication interface 304. The deletion request packet 251 is transmitted to the HA 113 via the input / output terminal 302.

  When the deletion request packet 251 reaches the HA 113, it passes through the input / output terminal 401 and the communication interface 411 in the HA 113 and reaches the packet classification unit 412. The packet classification unit 412 identifies that the received packet is the deletion request packet 251, and passes the deletion request packet 251 to the packet analysis unit 415. The packet analysis unit 415 analyzes the packet and deletes the corresponding MR 112 entry from the storage unit 416. Further, in order to respond to the MR 112 that the deletion has been normally completed, the signaling packet generation unit 418 is instructed to generate a confirmation response signaling packet (acknowledgment packet 252). The signaling packet generation unit 418 passes the confirmation response packet 252 to the communication interface 411. The communication interface 411 transmits an acknowledgment packet 252 to the MR 112 via the output terminal 401.

  When the MR 112 receives the confirmation response packet 243 from the input / output terminal 302 and the communication interface 304, the MR 112 identifies that the packet is a signaling packet by the packet classification unit 324 and passes it to the packet analysis unit 323. The packet analysis unit 323 analyzes the reception confirmation response packet to confirm that the deletion is successful, and ends the operation.

  In the above description, the encapsulation technique is an example of a means for tunneling between the mobile router and the home agent. As other means, the MIPv6 header option or MPLS (Multi Protocol Label Switching) is used. You may implement | achieve by. In that case, the encapsulating unit and the decapsulating unit of the mobile router and the home agent are replaced with functional units corresponding to the technology used.

FIG. 1 is a diagram showing a network configuration to which the present invention is applied.

FIG. 2 is a block diagram of the MR 112.

FIG. 3 is a block diagram of the HA 113.

FIG. 4 is a diagram showing a communication sequence.

FIG. 5 is a diagram showing an example of the MNN management table held by the MR.

FIG. 6 is a diagram showing an example of an MR management table held by the HA.

Explanation of symbols

101 Mobile network 102 Internet 111 MNN (Mobile Network Node)
112 MN (Mobile Node)
113 HA (Home Agent)
114 CN (Correspondent Node)

Claims (26)

A mobile communication system comprising a home agent, a mobile node, and one or more communication nodes,
The mobile node is
Means for storing a pre-assigned representative home address, one or more auxiliary home addresses pre-assigned and assigned to a communication node, and a care-of address temporarily assigned in the current network;
Means for requesting registration of binding information, which is information related to a representative home address, all auxiliary home addresses, and care-of addresses, every time a new care-of address is assigned after moving to another network And
The home agent
A table in which the join information is registered in response to the join information registration request;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, search for binding information including the representative home address or the auxiliary home address, and forward the packet to the care-of address corresponding to the address. A mobile communication system. The mobile node is
Means for requesting the home agent to assign a new auxiliary home address;
A means for returning the assigned auxiliary home address;
The home agent
When an assignment of a new auxiliary home address is requested from the mobile node, an arbitrary address is selected from the unassigned address group that is held, and this address is registered in the mobile node binding information, and at the mobile node. A means of notification;
When the assigned auxiliary home address is returned from the mobile node, it is returned to the unassigned address and has a means for deleting it from the binding information of the mobile node,
The mobile communication system according to claim 1, wherein the number of auxiliary home addresses owned by the mobile node can be dynamically changed. A plurality of mobile network nodes are arranged under the mobile node, and these constitute a local network having the mobile node as a router,
The mobile node has a means for assigning an auxiliary home address to the mobile network node and forwarding a packet addressed to the auxiliary home address assigned to the mobile network node to a corresponding mobile network node when the packet arrives.
The mobile node is configured to perform location registration for a mobile network node of a local network to be managed on behalf of the mobile node and transfer a packet addressed to the mobile network node. Item 3. The mobile communication system according to Item 2. The mobile node is
When a new mobile network node is added in the local network and the mobile network node requests the mobile node to assign an address, an arbitrary unregistered auxiliary home address is assigned to the mobile network node and On the other hand, when the mobile network node is deleted from within the local network and the mobile network node notifies the mobile node to return the auxiliary home address, the mobile node sends a request to the home agent to request additional registration of the auxiliary home address. And means for requesting deregistration of this auxiliary home address,
4. The mobile communication system according to claim 3, wherein the number of registered auxiliary home addresses owned by the mobile node is dynamically increased or decreased in accordance with addition or deletion of the mobile network node. The mobile node is
When a new mobile network node is added in the local network managed by the mobile node and the mobile network node requests the mobile node to assign an address, a new auxiliary home address is obtained from the home agent, Means for assigning to mobile network nodes;
Means for returning the auxiliary home address to the home agent when the mobile network node is deleted from the local network managed by the mobile node and the mobile network node notifies the mobile node of the return of the auxiliary home address;
The mobile communication system according to claim 3, wherein the mobile communication system is configured to dynamically increase or decrease the number of auxiliary home addresses owned by the mobile node in accordance with addition or deletion of the mobile network node.   When the mobile node registers, updates, or deletes the representative home address and an arbitrary number of auxiliary home addresses at the same time with respect to the home agent, information on all the addresses is collected into one message. 6. The mobile communication system according to claim 1, further comprising means for transmitting to a home agent. A mobile node in a mobile communication system composed of a home agent, a mobile node, and one or more communication nodes,
Means for storing a pre-assigned representative home address, one or more auxiliary home addresses pre-assigned and assigned to a communication node, and a care-of address temporarily assigned in the current network;
Means for requesting registration of binding information, which is information related to a representative home address, all auxiliary home addresses, and care-of addresses, every time a new care-of address is assigned after moving to another network And a mobile node. Means for requesting the home agent to assign a new auxiliary home address;
The mobile node according to claim 7, further comprising means for returning the assigned auxiliary home address. An arbitrary auxiliary home address is assigned to a plurality of subordinate mobile network nodes, and when a packet addressed to the auxiliary home address assigned to the mobile network node arrives, a means for transferring the packet to the corresponding mobile network node is provided.
The configuration according to claim 7 or 8, wherein the location registration for the mobile network node of the local network to be managed is performed on behalf and the packet addressed to the mobile network node is forwarded. Mobile node. When a new mobile network node is added in the local network and the mobile network node requests an address assignment, it assigns any unregistered auxiliary home address to the mobile network node and When requesting additional registration of home address, the mobile network node is deleted from the local network, and the mobile network node notifies the return of the auxiliary home address, the home agent is requested to deregister the auxiliary home address. Means to
The mobile node according to claim 9, wherein the mobile node is configured to dynamically increase or decrease the number of registered auxiliary home addresses in accordance with addition or deletion of the mobile network node. When a new mobile network node is added in the local network to be managed, and the mobile network node requests an address assignment, means for obtaining a new auxiliary home address from the home agent and assigning it to the mobile network node;
When the mobile network node is deleted from within the local network to be managed and the mobile network node notifies the return of the auxiliary home address, the mobile network node has means for returning the auxiliary home address to the home agent,
The mobile node according to claim 9, wherein the mobile node is configured to dynamically increase or decrease the number of auxiliary home addresses owned in accordance with addition or deletion of a mobile network node.   When registering, updating, or deleting a representative home address and an arbitrary number of auxiliary home addresses at the same time with the home agent, information on all addresses is collected in one message and sent to the home agent. The mobile node according to claim 7, further comprising: means. A home agent in a mobile communication system composed of a home agent, a mobile node, and one or more communication nodes,
The relationship between the representative home address of the mobile node, the plurality of auxiliary home addresses that the mobile node has that the mobile node assigns to the communication node, and the care-of address temporarily assigned to the mobile node in the network in which the mobile node is present A table that receives a registration request for binding information, which is information, from the mobile node and registers the binding information;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, binding information including the representative home address or the auxiliary home address is searched from the table, and a care-of address corresponding to the address is assigned. And a means for transferring the packet to the home agent. When the mobile node is requested to register additional auxiliary home address, means for adding the address to the binding information of the corresponding mobile node;
14. The home agent according to claim 13, further comprising means for deleting the address from the binding information of the corresponding mobile node when the registration cancellation of the auxiliary home address is requested. When an assignment of a new auxiliary home address is requested from the mobile node, an arbitrary address is selected from the unassigned address group that is held, and this address is registered in the mobile node binding information, and at the mobile node. A means of notification;
15. The apparatus according to claim 14, further comprising means for returning the assigned auxiliary home address from the mobile node to the unassigned address and deleting the returned address from the binding information of the mobile node. The listed home agent. A mobile node control program in a mobile communication system including a home agent, a mobile node, and one or more communication nodes,
The control program allows the mobile node to
Means for storing a pre-assigned representative home address, zero or more auxiliary home addresses pre-assigned, and a care-of address temporarily assigned in the current network;
As a means for requesting registration of binding information, which is information related to the representative home address, all auxiliary home addresses, and care-of addresses, whenever a new care-of address is assigned after moving to another network. A mobile node control program characterized by functioning. The control program allows the mobile node to
Means for requesting the home agent to assign a new auxiliary home address;
The mobile node control program according to claim 16, further comprising a function for returning the assigned auxiliary home address. The control program allows the mobile node to
An arbitrary auxiliary home address is assigned to a plurality of subordinate mobile network nodes, and when a packet addressed to the auxiliary home address assigned to the mobile network node arrives, it is made to function as a means for transferring the packet to the corresponding mobile network node. The mobile node control program according to claim 16 or 17, characterized in that: The control program allows the mobile node to
When a new mobile network node is added in the local network and the mobile network node requests an address assignment, it assigns any unregistered auxiliary home address to the mobile network node and When requesting additional registration of home address, the mobile network node is deleted from the local network, and the mobile network node notifies the return of the auxiliary home address, the home agent is requested to deregister the auxiliary home address. The mobile node control program according to claim 18, wherein the mobile node control program is made to function as a means for performing the operation. The control program allows the mobile node to
When a new mobile network node is added in the local network to be managed, and the mobile network node requests an address assignment, means for obtaining a new auxiliary home address from the home agent and assigning it to the mobile network node;
The mobile network node is deleted from the local network to be managed, and when the mobile network node notifies the return of the auxiliary home address, the mobile network node functions as means for returning the auxiliary home address to the home agent. The mobile node control program described. The control program allows the mobile node to
When registering, updating, or deleting a representative home address and any number of auxiliary home addresses at the same time with the home agent, information on all addresses is collected in one message and sent to the home agent. The mobile node control program according to any one of claims 16 to 20, wherein the mobile node control program functions as a means. A home agent control program in a mobile communication system composed of a home agent, a mobile node, and one or more communication nodes,
The control program sends the home agent,
The relationship between the representative home address of the mobile node, the plurality of auxiliary home addresses that the mobile node has that the mobile node assigns to the communication node, and the care-of address temporarily assigned to the mobile node in the network in which the mobile node is present A means for receiving a registration request for binding information, which is information, from the mobile node and storing the binding information;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, search for binding information including the representative home address or the auxiliary home address from the stored binding information, and correspond to that address. A control program for a home agent that functions as means for transferring a packet to a care-of address. The control program sends the home agent,
When the mobile node is requested to register additional auxiliary home address, means for adding the address to the binding information of the corresponding mobile node;
23. The home agent control program according to claim 22, wherein when the registration cancellation of the auxiliary home address is requested, the home agent control program functions as means for deleting the address from the binding information of the corresponding mobile node. The control program sends the home agent,
When an assignment of a new auxiliary home address is requested from the mobile node, an arbitrary address is selected from the unassigned address group that is held, and this address is registered in the mobile node binding information, and at the mobile node. A means of notification;
24. When the assigned auxiliary home address is returned from the mobile node, it is returned to an unassigned address and functions as means for deleting this from the connection information of the mobile node. Home agent control program. An address management method in a mobile communication system including a home agent, a mobile node, and one or more communication nodes,
When a care-of address temporarily assigned is newly assigned by moving to another network, the mobile node is pre-assigned with the newly assigned care-of address, a pre-assigned representative home address, Requesting the home agent to register binding information, which is information related to one or more auxiliary home addresses assigned to the communication node;
A home agent receiving a registration request for the binding information from the mobile node and storing the binding information;
When a packet addressed to a representative home address or an arbitrary auxiliary home address arrives from an arbitrary communication node, the home agent searches the binding information storing the binding information including the representative home address or the auxiliary home address, and performs this binding. An address management method in a mobile communication system, comprising: obtaining a care-of address corresponding to the address based on the information; and forwarding the packet to the care-of address. When the home agent has an unassigned address and is requested by the mobile node to assign a new auxiliary home address, the home agent selects an arbitrary address from the held unassigned addresses and assigns this address to the mobile By registering with the node binding information and notifying the mobile node, the mobile node obtains a new auxiliary home address,
When the mobile node no longer needs the auxiliary home address, the mobile node returns the auxiliary home address to the home agent, and the home agent deletes the auxiliary home address from the binding information, so that the mobile node owns the auxiliary home address. 26. The address management method in a mobile communication system according to claim 25, wherein the number is dynamically changeable.

Images