CN1762132A - Mobile router, position management server, mobile network management system, and mobile network management method - Google Patents

Abstract

When connected to an external network (7), a mobile router (5) checks an address table if a home address is allocated. If it is not allocated, the mobile router derives the address of a position management server from a position management server address table and sends an allocation request message to the position management server (2). The position management server (2) receives an address management table holding addresses to be allocated to each mobile network (4) and the allocation request message sent from the mobile router (5), searches the address management table for an unused address, and sends an allocation permission message to the mobile router (5) to automatically allocate a home address to the mobile router (5).

Description

Mobile router, location management server, mobile network management system and mobile network management method

technical field

The present invention relates to a mobile network composed of a mobile router and a mobile terminal, a mobile network management method and a mobile network management system capable of continuing communication when the mobile network moves to an external network.

Background technique

As an existing mobile terminal management system, standardization is promoted by the Mobile-IP (Internet Protocol) working group of the Internet Standardization Organization IETF (Internet Engineering Task Force). In addition, the NEMO (Network Mobility) working group of the IETF promotes standardization as a mobile network management method when not only the terminal moves but also the entire network moves. As a conventional mobile network management technology, known technology is, for example, the mobile network management technology disclosed in JP-A-8-237717.

Hereinafter, it demonstrates using drawing.

FIG. 17 is a diagram showing the configuration of a conventional mobile network management system. The home network 1001 is composed of a home gateway 1003 connected to the Internet and a location management server 1002, and a mobile network 1004 is located in the home network 1001 as a home. The mobile network 1004 is composed of a mobile router 1005 and a host node 1006 that maintain an interface to an external network and an interface to an internal network. The external network 1007 is constituted by an external access router 1008 . Furthermore, there is also a communication node 1010 that communicates with the mobile network 1004 via the Internet 1009 .

In the document "Network Mobility (NEMO) Basic Support Protocol" (IETF NEMOWG, drafi-ietf-nemo-basic-support-02.txt, December 2003), the mobile router 1005 belongs to the home network 1001, which is represented by the home network 1001 The network address "HomePrefix::10" is generated by the attribution network prefix HomePrefix of the overall network address and its own hardware address "10". This address is unique on the Internet. In addition, assuming that PrefixA is assigned as a network prefix inside the mobile network 1004, the host node 1006 generates a network address PrefixA::20 from its own hardware address "20".

When the mobile router 1005 moves and connects to an external network 1007, the external access router 1008 of the external network 1007 assigns the external network prefix ForeignPrefix to the mobile router 1005. The mobile router 1005 sets the foreign network address "ForeignPrefix::10" generated from the foreign network prefix ForeignPrefix and its own hardware address "10" as a temporary address used in the foreign network 1007 .

Mobile router 1005 notifies its own temporary address "ForeignPrefix::10" in order to forward the packet to location management server 1002 of home network 1001 . The location management server 1001 stores the received temporary address "ForeignPrefix::10" of the mobile router 1004 in association with the home address "HomePrefix::10".

Afterwards, when sending data packets destined for the mobile router 1005 from the communication node 1010 located in another network, since the communication node 1010 does not know the movement of the mobile router 1005, no matter whether the mobile router 1005 is located in the home On the network 1001, the data packet is first sent to the home network 1001.

When the data packet sent to the mobile router 1005 by the communication node 1010 is transmitted to the home network 1001, the location management server 1002 on the home network 1001 captures the packet of the stored home address "HomePrefix::10" of the mobile router 1005, The data packets are forwarded to the foreign network 1007 according to the corresponding foreign address "ForeignPrefix::10".

When a data packet is sent from the communication node 1010 to the host node 1006, it is sent to the address "PrefixA::20" of the host node 1006. The packet sent to this address is first sent to the home network 1001, and then sent to the mobile router 1005 as the next-hop router according to the routing table kept by the home gateway. However, the location management server 1002 captures the packet addressed to the home address "HomePrefix::10" of the mobile router 1005, and forwards the data packet to the foreign network 1007 according to the corresponding foreign address "ForeignPrefix::10".

In this way, in the existing data communication, the mobile router 1004 has two addresses, the address of the home network 1000 and the address of the external network 1007, the location information of the mobile router 1004 is managed by the location management server 1001 of the home network 1000, and Data packets are forwarded to realize packet routing that can cope with changes in address recognition accompanying the movement of mobile router 1004 .

Moreover, in the past, when the router was newly connected to the network, an IP address was automatically assigned by a DHCP (Dynamic Host Configuration Protocol) server, but the address assigned by the DHCP server was a common address only in the subnet to which the DHCP belongs, and could not adapt to the The case where a mobile router moves and connects to another external network. Therefore, the "home address" of the mobile router is manually set by the user or must be connected to the home network at the time of initial startup, and the address needs to be dynamically assigned by the location management server.

However, there is a problem that if the mobile management server is installed by a general service provider instead of a user with a mobile router, there is no means for setting a home address in advance because the manufacturing company of the mobile router and the home node are different. , the user needs to ask the provider of the agreement to assign the home address for the mobile router and the network prefix for the mobile network, which must be set manually.

Contents of the invention

The object of the present invention is to provide a mobile network management system for a new mobile router to automatically inquire about its own home address from a location management server and assign it, a mobile router, a location management server and a mobile network management method that constitute these mobile network management systems .

In the mobile network management system involved in the present invention, the mobile router has: an address table that keeps whether the home address and the temporary address have been allocated; When distributing the home address, derive the address of the location management server by the location management server address table that keeps the address of the location management server, and send the address distribution request part of the distribution request message to the location management server; an address management table of addresses in the network; and an address allocation unit that retrieves an unused address from the address management table and transmits an allocation permission message to the mobile router after receiving an allocation request message from the mobile router.

With such a structure, even if the mobile router purchased by the user is in the initial state, the user can automatically inquire about the home address of the location management server and communicate with the user without trouble.

The mobile network management method according to the present invention is characterized in that: a mobile router having an external interface connected to the external network and an internal interface connected to the internal network and one or more mobile routers provided with an internal interface connected to the internal network When the mobile network consisting of two terminals moves from the home network, the location management server that manages the address assigned to the mobile network forwards the communication packet addressed to the home address to the external network address of the moving destination, and the mobile router maintains the home address. And the address table for allocation of the temporary address judges whether the home address is allocated, and requests the home address and the temporary address to the location management server if the home address is not allocated.

In this way, the mobile router judges whether a home address has been assigned, and if it is not assigned, it requests the location management server for a home address and a temporary address, so that the mobile network does not require complicated address setting by the user even if the mobile network is not located in the home network in advance. It is possible to assign the address of the mobile network as a whole.

In addition, the management method of the mobile network involved in the present invention includes the following steps: the mobile router receives the temporary address from the external network; when the mobile router has not obtained the home address, according to the message assigned to the temporary address, the home A step in which the location management server for address assignment requests the assignment of the home address; the location management server assigns an unused address to the mobile router, and sends the assigned address to the mobile router; the mobile router receives the home address, and when logging in A step of sending a response to the location management server; and a step of associating the mobile router with the home address and logging in when the location management server receives the response.

In this way, by connecting to an external network and acquiring a temporary address as an opportunity, the latest address assignment can be acquired. In addition, address assignments can be acquired in a simple sequence of request messages and response messages to the request messages.

In addition, in the mobile network management method of the present invention, after the mobile router further adds the authentication ID that accepts the allocation of the home address, it sends an allocation request to the location management server, and the location management server judges whether the authentication ID is the authentication ID of the management object. When the object is assigned a home address to the mobile router.

In this way, since the location management server assigns a home address only to a specific mobile router, it is possible to limit subordinate mobile routers.

In addition, the management method of the mobile network according to the present invention includes: the step of the second mobile router requesting the proxy acquisition of the home address to the first mobile router which has received the allocation of the home address through the location management server; The step of the server requesting the home address of the second mobile router; the location management server distributes the home address of the second mobile router and sends it to the first mobile router; and the first mobile router forwards the received home address to the second mobile router address steps.

In this way, the mobile router newly added to the mobile network can obtain its own home address before connecting to the external network.

The mobile router according to the present invention includes: an address table for retaining assignment of a home address and a temporary address; an address assignment request unit for judging whether a home address has been assigned based on the address table; and an address for a location management server for assigning a home address. The address table of the location management server; and the address registration part that registers the received home address and temporary address into the address table; when the address assignment request part judges that no home address has been allocated in the address table, it adds the temporary address to the location The management server makes an assignment request, and the address registration unit updates the address table with the assigned home address table received by the location management server.

In this way, when the mobile network is not located in the home network in advance, it is possible to assign the addresses of the entire mobile network without requiring the user to troublesome address setting.

Also, when the mobile router according to the present invention acquires the temporary address from the external network, the address assignment request unit makes an assignment request to the location management server.

In this way, the latest address allocation can be acquired.

In addition, the address allocation request unit of the mobile router according to the present invention further adds an authentication ID for accepting home address allocation, and then requests allocation to the location management server.

In this way, the mobile router is identified based on the authentication ID, and a home address is assigned.

In addition, the mobile router involved in the present invention also includes a proxy requesting unit that requests the location management server to obtain a proxy of the home address and an address forwarding unit that forwards the home address obtained by the location management server as a proxy. When the other mobile router receives the request obtained by the proxy, it adds an identifier for identifying another mobile router to the allocation request, and the address forwarding unit forwards the home address received by the location management server to another mobile router obtained by the requesting proxy.

In this way, the home address of the mobile router that is not connected to the external network can be acquired by the proxy and transmitted.

The location management server related to the present invention has: an address management table that holds the home address assigned to the mobile router, retrieves an unused address from the address management table after receiving an assignment request from the mobile router, and sends the assigned home address to the mobile router. The Address Assignment Department of the address.

In this way, by responding to the request of the mobile router and presenting the home address, even if the mobile network is not located in the home network in advance, the address of the entire mobile network can be allocated without requiring the user to troublesome address setting.

In addition, the location management server according to the present invention further has an authentication list storing an authentication ID that allows assignment of a home address to a mobile router, and the address assigning unit judges whether the authentication ID of the first mobile router requesting a home address and the authentication ID in the authentication list are Consistent, when consistent, allocate a home address to the first mobile router, and send the home address.

In this way, the mobile router can be identified by the authentication ID, and a home address can be assigned.

In addition, the address assigning unit of the location management server according to the present invention, when the first mobile router receives a home address reception response, associates the authentication ID with the assigned home address and stores them in the address management table, and does not allow The mobile router's new home address assignment request for the authentication ID.

In this way, home address assignment requests from the same mobile network can be restricted. In addition, when the allocated mobile network fails and cannot receive the address allocation permission, the location management server can detect that the address has not been allocated, and can prevent wrong address allocation.

In addition, the address assignment unit of the location management server according to the present invention, when receiving a home address assignment request from the second mobile router from the first mobile router that has assigned the home address, assigns a new home address to the second mobile router, and Send to the first mobile router.

In this way, the home address can be assigned only to the proxy request from the home address of the authenticated mobile router, so the assignment can be limited.

In addition, the mobile network management system involved in the present invention includes the mobile router involved in the present invention and the location management server involved in the present invention.

In this way, even if the mobile network is not located in the home network in advance, the addresses of the entire mobile network can be allocated without requiring the user to perform complicated address setting.

According to the present invention as described above, a user can automatically assign a home address to a mobile router or a subordinate terminal without performing complicated setting work.

Description of drawings

FIG. 1 is a block configuration diagram of a mobile network management system in Embodiment 1 of the present invention.

FIG. 2 is a flowchart of address assignment processing of the mobile router in Embodiment 1 of the present invention.

FIG. 3 is a flowchart of address assignment processing by the location management server in Embodiment 1 of the present invention.

FIG. 4A is a diagram showing the format of an address assignment request message in Embodiment 1 of the present invention.

4B to 4D are diagrams showing the format of an address allocation permission message in Embodiment 1 of the present invention.

FIG. 4E is a diagram showing the format of an address assignment completion message in Embodiment 1 of the present invention.

5A to 5C are diagrams showing logical setting examples of the address table of the mobile router in Embodiment 1 of the present invention.

6 is a diagram showing a logical setting example of an address management table of the location management server in Embodiment 1 of the present invention.

Fig. 7 is a block configuration diagram of a location management server in Embodiment 1 of the present invention.

FIG. 8 is a block configuration diagram of the mobile router in Embodiment 1 of the present invention.

FIG. 9 is a block configuration diagram of a mobile router in Embodiment 2 of the present invention.

Fig. 10 is a block configuration diagram of a mobile network management system in Embodiment 2 of the present invention.

FIG. 11 is a flowchart of address assignment processing by the second mobile router in Embodiment 2 of the present invention.

FIG. 12 is a flowchart of address assignment processing by the first mobile router in Embodiment 2 of the present invention.

Fig. 13 is a flowchart of address assignment processing by the location management server in Embodiment 2 of the present invention.

14A and 14B are diagrams showing the format of an address assignment request message in Embodiment 2 of the present invention.

14C and 14D are diagrams showing the format of an address allocation permission message in Embodiment 2 of the present invention.

15A and 15B are diagrams showing the format of an address allocation end message in Embodiment 2 of the present invention.

FIG. 16 is a diagram showing a logical setting example of an address management table of the location management server in Embodiment 2 of the present invention.

Fig. 17 is a block configuration diagram of a mobile network management system in a conventional example.

Detailed ways

Next, embodiments of the present invention will be described with reference to the drawings.

(Embodiment 1)

FIG. 1 is a block diagram of a network including a mobile network management system in Embodiment 1 of the present invention.

In FIG. 1 , a home network 1 is composed of a home gateway 3 and a location management server 2 connected to the Internet, and a mobile network 4 moves to an external network 7 instead of the home network 1 .

In addition, the mobile network 4 is composed of a mobile router 5 and a host node 6 having an interface of an external network 7 and an interface of an internal network 11 .

In addition, the external network 7 is constituted by an external access router 8 .

There is also a communication node 10 communicating with the mobile network 4 via the Internet 9 . In addition, the communication method of the mobile router may be wired or wireless.

In this embodiment, differences from FIG. 17 described in the prior art will be mainly described.

In FIG. 7, the location management server 2 is composed of the following parts: a network IF 21 as a physical network interface used to connect to the home network 1, a packet transceiver 22 for sending and receiving packets, a packet generator 23 for generating messages, and a The address management table 24 in which the home address is registered in association with the mobile router, the address allocation unit 25 that performs processing when receiving an address allocation message from the mobile router 5, the authentication ID list 26 that stores the authentication ID of the address allocation that allows registration, A server message analysis unit 27 for discriminating the type of received message, a location management table 28 for storing the current location of the mobile router, and a location management unit 29 for managing the current location of the mobile router.

In addition, in FIG. 8, the mobile router 5 is composed of the following parts: an external network IF51 as a physical network interface used to connect to the external network 7, an internal network IF52 as a physical network interface used to connect to the internal network, A packet transceiving unit 53 for sending and receiving packets, a packet generating unit 54 for generating messages for address allocation, an address allocation requesting unit 55 for transmitting and receiving messages related to address allocation to the location management server 2, holding home addresses and fixed The address table 56 of the address, the location management server address table 57 holding the address of the location management server 2, the user IF 58 for setting the address from the location management server address table 57 or the address table 56 from the user, and recording the authentication to allow address distribution An authentication ID recording unit 59 for ID, a message analyzing unit 60 for discriminating a received message, and an address registration unit 61 for registering a temporary address or a home address in the address table 56 .

These location management servers 2 and mobile routers 5 constitute a mobile network management system.

Next, the operation of the mobile network management system configured as above will be described with reference to the drawings.

FIG. 2 is a flowchart of address assignment processing of mobile router 5 in Embodiment 1 of the present invention. FIG. 3 is a flowchart of address assignment processing by the location management server 2 in the embodiment of the present invention. 4A to 4E are diagrams showing the structure of an address assignment request message. 5A to 5C are diagrams showing logical setting examples of the address table 56 included in the mobile router 5 . FIG. 6 is a diagram showing a logical setting example of the address management table 24 included in the location management server 2 .

First, the mobile router 5 will be described.

First, when the mobile router 5 is connected to the external network 7, it receives a temporary temporary address "ForeignPrefix::10" from the external access router 8 of the external network 7 through the external network IF51, and transmits it to the message analysis part 60 through the packet transceiver part 53 . The message analysis unit 60 judges it as an address registration message, and notifies the address registration unit 61 . Thereafter, the address registration unit 61 registers the received temporary address in the address table 56 (step S200). In addition, the hardware address of the mobile router 5 is set to "10" here. As shown in FIG. 5A , the initial state of the address table 56 is that the temporary address 501 , the home address 502 and the internal prefix 503 are all empty, and the temporary address 501 is acquired. In this way, it becomes the state in FIG. 5B .

Then, when the address registration unit 61 acquires the temporary address 501, it searches the address table 56 to see if its own home address exists (step S201). In the address table 56, if the assignment of the home address to the home address 502 is completed, the processing is terminated (step S202).

When the assignment of the home address has not been completed, the address registration unit 61 requests the address assignment request unit 55 to acquire the home address. The address allocation request unit 55 searches the network address of the location management server 2 from the location management server address table 57 of the location management server 2 (step S203). Here, if it does not exist even after the search, a message may be output to the user IF58 to urge input of an address from the user.

After that, when the network address of the location management server 2 is determined, the address request assignment unit 55 instructs the packet generation unit 54 to generate the address assignment request message 400 shown in FIG. 4A (step S204). Here, the network address of the location management server 2 is set in the "destination address" 401, the "temporary address" is set in the source address 402, and the value indicating "address assignment request" is set in the command 403. In addition, "authentication ID" 404 is set with a unique ID given to each mobile network when the provider signs an agreement, and some parts are notified in advance to users with mobile networks, and are stored in the authentication ID storage unit 59 through the user IF58. The authentication ID. With this "authentication ID", the location management server 2 can identify packets from each mobile network.

Afterwards, the packet generating unit 54 sends the message 400 to the packet transmitting and receiving unit 53, and the packet transmitting and receiving unit 53 judges based on the destination address and forwards the packet through the external network IF51 (step S205).

Then, after the address allocation request unit 55 transmits the address allocation request message, it sets a timer for a predetermined time to wait until the address allocation permission message 410 of FIG. 4B is received from the location management server 2 (step S206). During this period, it is judged whether it is timed out (step S207), and the processing is terminated if timed out (step S214). Here, as the address allocation permission message 410 shown in FIG. 4B , a temporary address is set in the “destination address” 411 and the network address of the location management server 2 is set in the “source address” 412 . In addition, when the location management server 2 has an assigned address, a value representing "address assignment" is set in the command 413, the home address of the mobile router 5 is set in the home address 415, and the address of the mobile network is set in the prefix 416. internal prefix. In addition, when the corresponding address has been allocated, as shown in Figure 4C, a value representing "allocation complete" is set in the command 413, when there is no available address in the addresses allocated by the location management server 2, as shown in Figure 4D As shown, a value representing "no address" is set in command 413.

Thereafter, when the mobile router 5 receives the address assignment permission message 410 from the location management server 2, the address registration unit 61 confirms the command in the address assignment permission message 410 (step S208). If the command 413 in the address assignment permission message 410 is "address assignment", the verification of the authentication ID 414 is performed (step S209). When the command 413 is not "address assignment", the processing is terminated (step S214).

Thereafter, the address registration unit 61 judges whether or not the authentication ID 414 is its own authentication ID (step S210). If it is not the own authentication ID, the processing is terminated (step S214). When it is its own authentication ID, as shown in FIG. 5C , address registration unit 61 stores home address 415 and internal prefix 416 assigned to itself in address table 56 .

Thereafter, the address registration unit 61 notifies the address allocation request unit 55 that the setting has been completed. The address allocation request unit 55 instructs the packet generation unit 54 to generate the address allocation completion message 420 shown in FIG. 4E (step S212). Here, the network address of the location management server is set in the "destination address" 421, the temporary address is set in the "sending source address" 422, and a value indicating "end of address allocation" is set in the command 423.

Then, the packet transmission/reception unit 53 transmits the address assignment completion message 420 to the location management server 2 (step S213). After receiving the message, the process ends (step S214).

Afterwards, by performing Neighbor Discovery processing, which is a general prefix resolution process specified in IPv6 (Internet Protocol Version 6), the host node 6 requests the mobile router 5 for a network prefix, and can determine the host node 6 itself. the address of. In this way, the mobile network as a whole is able to communicate.

Next, the processing when the location management server 2 receives the address allocation request message 400 will be described using the operation flowchart of FIG. 3 .

First, the packet transmission and reception unit 22 of the location management server 2 receives a message via the network IF 21, and the server message analysis unit 27 discriminates its type. When the received message is the address assignment request message 400, the server message analysis unit 27 notifies the address assignment unit 25 (step S300).

Then, the address assigning unit 25 checks whether the received authentication ID exists in the authentication ID list 26, and if it does not exist, it terminates the processing as acceptance and addition (step S318).

On the other hand, when there is an authentication ID in the authentication ID list 26, the address management table 24 is searched for using the authentication ID 404 as a key (step S302). FIG. 6 shows an example of logical items of the address management table 24 . Here, "home address" 601 indicates the address of the terminal that is being location managed, "prefix" 602 indicates the network prefix of the internal network 11 to which the terminal belongs, and "temporary address" 603 indicates the terminal allocated on the external network of the moving destination temporary address. "Authentication ID" 604 is set with an authentication ID for specifying the network to which the address is allocated, and "Flag" 605 indicates the status of allocation of the home address.

Thereafter, the address assigning unit 25 judges whether or not there is an available address among the assigned home addresses (step S303). When there is no available address, as shown in FIG. 4D, the command 413 of the address allocation permission message 410 is set to "no address" (step S304).

Then, the address allocation unit 25 instructs the packet generation unit 23 to generate the address allocation permission information 410 shown in FIG. 4D (step S305).

Afterwards, the packet generator 23 sends the address allocation permission message 410 to the packet transceiver 22, and the packet transceiver 22 judges by the destination address, forwards the packet through the network IF 21 (step S306), and terminates the process (step S318).

On the other hand, in step S303, when there is no available address, the address assignment unit 25 judges whether there is an authentication ID identical to the matching authentication ID 604 (step S307), if the flag 605 of the address management table 24 is "allocation completed ", then it is determined that the assignment of the home address has been completed to the network that already has the authentication ID. In addition, if the flag 605 is "allocating", it is determined that the address allocation process is in progress. If the flag 605 indicates "allocation completed" or "allocation in progress", as shown in FIG. 4C, the command value 413 of the address allocation permission message 410 is set to "address allocation completed" (step S308).

Then, the address allocation unit 25 instructs the packet generation unit 23 to generate the address allocation permission message 410 shown in FIG. 4C (step S309). Thereafter, the packet transmitting/receiving unit 22 transmits the message via the network IF 21 (step S310), and terminates the processing (step S318).

On the other hand, in step S307, when there is no authentication ID item in the address management table 24 and there is an available address, the address assigning section 25 sets "address assign" in the command 413, and in the address assign permission message In 410, the home address 415 and the internal prefix 416 are set (step S311).

FIG. 4B shows the address assignment permission message 410. Referring to FIG. Here, the home address assigned to the mobile router 5 is set in the “home address” 415 , and the network prefix used in the internal network 11 of the mobile network 4 is set in the “internal prefix” 416 .

Thereafter, the address allocation unit 25 instructs the packet generation unit 23 to generate the address allocation permission message 410 shown in FIG. 4B (step S312).

Then, the packet generator 23 sends the address assignment permission message 410 to the packet transceiver 22, and the packet transceiver 22 judges based on the destination address and forwards the packet through the network IF 21 (step S313).

Thereafter, after the address allocation unit 25 transmits the address allocation permission message 410, it sets a timer for a predetermined time, and waits until the address allocation completion message 420 shown in FIG. 4C is received from the mobile router 5 (step S314). During this period, it is judged whether overtime (step S315), when overtime, the address distribution unit 25 judges that the mobile router of the sending destination cannot receive the address distribution permission message 410, and the address distributed in the address management table 24 is restored to the original state (step S317). The processing is then terminated (step S318).

On the other hand, when the address allocation unit 25 receives the address allocation completion message 420 (step S314), it checks whether the "home address" 601 retrieved from the address management table 24 using "authentication ID" as a key matches the destination address. If they match, the flag 605 of the address management table 24 is set to "Complete" (step S316), and the processing is terminated (step S318).

By performing the above-mentioned address allocation processing, as shown in Figure 6, allocation is performed so that the host node 6 is PrefixA::20, the home address is HomePrefix::1, and the temporary address of the mobile router 5 is ForeignPrefix::10 .

By performing the address allocation process as described above, the user can automatically set the network address for the mobile router or the subordinate host node without performing complicated setting work.

(Embodiment 2)

FIG. 10 is a block diagram showing the configuration of the network in this embodiment.

In FIG. 10 , a first mobile router 1001 and a second mobile router 1002 are connected in a mobile network, which is different from the mobile network in the first embodiment. The block diagram of FIG. 9 shows the configurations of the first mobile router 1001 and the second mobile router 1002 .

In FIG. 9 , the difference between the mobile router in Embodiment 2 of the present invention and the mobile router in Embodiment 1 is that the mobile router in Embodiment 2 also has a proxy acquisition that requests a home address from another mobile router, or The proxy request unit 91 requests the location management server to proxy the home address of another mobile router, and the address forwarding unit 92 forwards the received home address addressed to another mobile router to the requesting source mobile router.

Next, the operation and role of the mobile router configured in this way will be described.

First, when the first mobile router is connected to an external network for the first time, it obtains its own home address, but the operation at this time is the same as that of the mobile router in Embodiment 1.

Then, the second mobile router is not connected to the external network 7 but is connected to the internal network 11 under the control of the first mobile router 1001 . The operation at this time will be described below using the drawings.

Fig. 11 is a flowchart showing the home address assignment operation of the second mobile router.

First, the second mobile router checks whether or not a home address is registered in the address table 56 as initialization processing (step S1101).

As shown in the address table 56 shown in Figure 5A, when the home address area is empty, the initialization processing part not shown in the figure indicates that the packet generation part 54 sends the RS (Router Selection) message to the internal network through the internal network IF52 (step S1103 ), when it is not empty, it is considered that the home address has been obtained, and the processing is terminated (step S1113). The RS message is a message to inquire about routers connected to the internal network, and the router that receives the RS message sends an RA (Router Advertisement) message as a response to notify itself of its existence.

Then, the initialization processing unit waits to receive an RA message from another mobile router connected to the internal network (step S1104). When the RA message is not received within the specified time, it is judged that other routers are not connected to the internal network, and the processing is terminated (step S1113).

Thereafter, when the packet transmitting/receiving unit 53 receives the RA message via the internal network IF 52 , the message analyzing unit 60 notifies the proxy requesting unit 91 . The proxy request unit 91 instructs the packet generation unit 54 to transmit an address allocation message requesting proxy acquisition of a home address to the mobile router of the transmission source of the RA message. Packet generation unit 54 generates the address allocation request message shown in FIG. 14A upon receipt of this instruction. This address allocation request message is different from Embodiment 1 in that it has an object address 1401 . The target address 1401 indicates a mobile router requesting assignment of a home address, and at this time, an address obtained from the prefix of the internal network of the second mobile router is set. In addition, the address of the first mobile router is set in the destination address 401, the own address (the address of the second mobile router) is set in the source address 402, and the command 403 indicates that it is a home address allocation request message. , and set the authentication ID set by oneself in the authentication ID 404. Since one authentication ID is usually used in the subnet, the same ID as that of the first mobile router is set. In addition, if there is no such authentication ID, nothing is set.

Packet generator 54 generates the address assignment request message set in this way, and sends it to packet transmitter-receiver 53, and packet transmitter-receiver 53 transmits to first mobile router 1001 through internal network IF 52 (step S1105).

Here, the operation of the first mobile router that requests the proxy assignment of the home address after receiving the address assignment request message will be described with reference to FIG. 12 .

In FIG. 12, when the packet transceiver unit 53 of the first mobile router receives an address assignment request message from the second mobile router through the internal network IF52, the message analysis unit 60 notifies the proxy request unit 91 (step S1201).

After receiving the notification, the proxy requesting unit 91 instructs the packet generating unit 54 so that the second mobile router 1002 sends an address assignment request message requesting home address assignment to the location management server 2, and the packet generating unit 54 generates the message shown in FIG. 14B Address assignment request message. In the target address 1401 of this address allocation request message, the address of the second mobile router requesting the allocation of the home address is set, the address of the location management server 2 is set in the destination address 401, and the address of the location management server 2 is set in the source address 402. One's own address (the address of the 1st mobile router), set and represent in order 403 and be the code of proxy home address assignment request message, if authentication ID is set in the address assignment request message from the 2nd mobile router, then in The authentication ID is set in the authentication ID 404 , and if it is not set, the authentication ID set by itself is set in the authentication ID 404 .

The packet generator 54 generates the address assignment request message set in this way (step S1202), and sends it to the packet transceiver 53, and the packet transceiver 53 sends it to the location management server 2 through the external network IF51 (step S1203). After that, it waits to receive an address assignment permission message as a response message to the address assignment request message (step S1204).

Next, the processing when the location management server 2 receives the address assignment request message from the first mobile router 1001 will be described using FIG. 13 .

In FIG. 13 , the processing from step S1300 to step S1307 is the same as the processing from step S300 to step S307 in Embodiment 1 shown in FIG. 3 .

In step S1307, when there is already the same item as the authentication ID, in Embodiment 1, it is considered that the home address has been allocated, and the address allocation is set in the command 413 of the address allocation permission message before sending (step S308 , S309, S310), but in Embodiment 2, the address assignment unit 25 will check whether it is within the number of home addresses assigned to the corresponding authentication ID (step S1308), and when there is still space, refer to the address management table 24 Check the address of the mobile router that sent the allocation request, and judge whether it is an authenticated mobile router (step S1309). When it is judged that the request is from an authenticated mobile router, the address assignment unit 25 assigns a new home address to the second mobile router described in the target address of the received address assignment request message. That is, address assigning unit 25 additionally registers home address 601, temporary address 603, and flag 605 at positions having the same authentication ID as first mobile router 1001 in the address management table shown in FIG. The flag at this time is "allocating". Then, the address allocation unit 25 instructs the packet generation unit 23 to generate an address allocation permission message in which the command 403 is "Address allocation" (step S1313).

After that, the packet generation unit 23 generates an address allocation permission message in the format shown in FIG. 14C. This message has an object address 1402, which differs from that shown in Figure 4B.

The packet generating unit 23 sets the command 413 as “Address Assignment”, and sets the assigned home address 415 and internal prefix 416 in the address assignment permission message 410 . In addition, the address of the internal network of the received second mobile router is set in the target address 1401 (step S1314). Subsequent operations (step S1315 to step S1320 ) are the same as the processing in Embodiment 1 (step S313 to step S318 ).

Next, the operation when the first mobile router receives the address allocation permission message from the location management server 2 will be described using FIG. 12 . In addition, if a response message is not received within a predetermined time during this reception wait, the processing is terminated (step S1205).

When the packet transmitting/receiving unit 53 of the first mobile router 1001 receives the message (step S1204), the message analyzing unit 60 notifies the proxy requesting unit 91. The proxy request unit 91 checks whether the target address 1401 is the address of the second mobile router (step S1206), and if it is not the address of the second mobile router, terminates the process (step S1204).

On the other hand, if it is the address of the second mobile router, it is checked whether the authentication ID 404 is an authentication ID commonly used by the mobile network to which the user belongs (step S1207). Then, when the authentication ID is the authentication ID of its own network, the proxy request unit 91 instructs the packet generation unit 54 to transmit an address allocation permission message to the second mobile router.

Upon receiving this instruction, the packet generation unit 54 generates an address allocation permission message shown in FIG. 14D (step S1208). At this time, instead of setting the internal network address of the second mobile router in the destination address 411, the packet generating unit 54 sets the internal network address of the first mobile router in the source address 412 instead, and forwards the packet sent by the The address allocation permission message received by the location management server 2.

Thereafter, the packet transmission/reception unit 53 transmits the address assignment permission message to the second mobile router 1002 via the internal network IF 52 (step S1209). After that, it waits to receive a response message from the second mobile router 1002 (step S1210).

Next, the operation when the second mobile router 1002 receives the address assignment permission message from the first mobile router 1001 will be described using FIG. 11 .

When the packet generating unit 53 of the second mobile router 1002 receives a message via the external network IF 52 (step S1106), the message analyzing unit 60 judges that the message is an address allocation permission message, and notifies the address registering unit 61. The address registration section 61 confirms the command 403 (step S1108), and checks whether the command is "address assignment" (step S1109). When the command is not "address distribution", terminate the processing (step S1113), when it is "address distribution", check whether the authentication ID 404 is the authentication ID of the mobile network to which the user belongs (step S1110). When the identification ID of the network to which it belongs does not match, the process is terminated (step S1113), and when the identification ID matches, the address registration unit 61 stores the home address 415 and the internal prefix 416 in the same address as the address table shown in Embodiment 1. table (step S1111).

Then, the address registration unit 61 notifies the completion of setting of the proxy request 91 . The proxy request unit 91 instructs the packet generation unit 54 to generate the address allocation completion message shown in FIG. 15A . This address allocation completion message is different from the first embodiment in that it has the target address 1501 . Here, in the "sending destination address" 421, the address of the internal network of the first mobile router is set, the address of the internal network of the second mobile router is set in the "sending source address" 422, and the address of the internal network of the second mobile router is set in the command 423. As a value indicating "address allocation completed", the identification ID of the mobile network to which the user belongs is set in the authentication ID 424, and the address of the internal network of the user (the second mobile router) is set in the target address 1501. Thereafter, the packet transmitting/receiving unit 53 transmits the address allocation completion message to the first mobile router (step S1112). Thereafter, the processing is terminated (step S1113).

Next, the operation when the first mobile router 1001 receives the address allocation completion message from the second mobile router 1002 will be described using FIG. 12 .

When the packet transmitting/receiving unit 53 of the first mobile router receives a message, the message analyzing unit 60 analyzes the type of the message, and notifies the proxy requesting unit 91 if it is an address assignment completion message (step S1210). The proxy request unit 91 generates an address allocation completion message shown in FIG. 15B in order to proxy respond to the received address allocation completion message to the location management server 2 (step S1212). Here, the proxy request unit 91 sets the address of the location management server in the "destination address" 421, sets the address of the external network of the first mobile router in the "source address" 422, and sets the address in the command 423. As a value indicating "address allocation completed", the authentication ID 424 is set with the identification ID of the mobile network to which the user belongs, and the target address 1501 is set with the address of the internal network of the second mobile router.

Then, the packet transmission/reception unit 53 transmits the address assignment completion message to the location management server (step S1213). After that, the processing is terminated (step S1214).

As described above, according to this embodiment, when a new mobile router is added to the mobile network, before connecting to an external network, another mobile router that already has a home address acts as a proxy, and the home address assignment process can be automatically performed. . Furthermore, thus, when the newly added mobile router is connected to an external network, it can also provide routing service.

Industrial availability

As described above, the present invention is useful for a mobile network composed of mobile routers and a mobile network management system composed of a location management server managing the mobile network, and is suitable for obtaining a home address when a new mobile router is connected to an external network. .

Claims (13)

1. a mobile network management method, this mobile network's management method, when by the mobile router that possesses external interface that is connected with external network and the internal interface that is connected with internal network, possess mobile network that one or more terminal of the internal interface that is connected with described internal network constitutes when home network has moved, the location management server of described mobile network's address is distributed in management, the communication packet that mails to home address is forwarded to the outside network address of mobile destination, it is characterized in that:

Described mobile router judges by the addresses distributed table that keeps home address and temporary address whether home address has been assigned with, when the angelica address also is not assigned with, to location management server request home address and temporary address.

2. mobile network management method is characterized in that:

May further comprise the steps:

Mobile router receives the step of temporary address from external network;

When described mobile router does not obtain home address, according to the message of having added described temporary address, to the step of the distribution of the location management server request home address of the distribution of carrying out home address;

Described location management server is given described mobile router with untapped address assignment, and sends the step of the home address of having distributed to described mobile router;

Described mobile router receives described home address, sends the step of replying to described location management server during login; With

When described location management server is received described replying, described mobile router and described home address are associated the step of logining.

3. mobile network management method according to claim 2 is characterized in that:

Described mobile router is further additional accepts to carry out to described location management server behind the authentication ID of distribution of home address the request of described distribution;

Described location management server judges whether described authentication ID is the authentication ID of management object, when being management object, carries out the distribution of home address to described mobile router.

4. mobile network management method according to claim 2 is characterized in that:

May further comprise the steps:

The 2nd mobile router is to the 1st mobile router of the distribution that receives home address by location management server, the step that the agency of request home address obtains;

The 1st mobile router is to the step of the home address of described location management server request broker the 2nd mobile router;

Described location management server distributes the home address of the 2nd mobile router, and the step that sends to the 1st mobile router; With

The 1st mobile router is transmitted the step of the home address of receiving to the 2nd mobile router.

5. mobile router is characterized in that:

Comprise:

The addresses distributed table that keeps home address and temporary address;

Judged whether to distribute the address assignment request portion of home address according to described address table;

Keep carrying out the location management server address table of address of location management server of the distribution of home address; With

The address login portion that the home address received and temporary address are signed in to described address table;

When described address assignment request portion is judged as when not giving described address table home address assignment, carry out request for allocation to described location management server behind the additional described temporary address, described address table is updated to described address login portion from described location management server home address that receive, that be assigned with.

6. mobile router according to claim 5 is characterized in that:

In the moment of having obtained described temporary address from external network, described address assignment request portion carries out request for allocation to described location management server.

7. mobile router according to claim 5 is characterized in that:

Described address assignment request portion behind the authentication ID of the further additional distribution of accepting home address, carries out described request for allocation to described location management server.

8. mobile router according to claim 5 is characterized in that:

Also have:

To the proxy requests portion that the agency of described location management server request home address obtains; With

The address forwarding portion of the home address that obtains is acted on behalf of in forwarding from described location management server;

When described proxy requests portion when another mobile router on the network is received the request that described agency obtains internally, carry out described request for allocation behind the identifier of described another mobile router of additional identification, described address forwarding portion will be transmitted to described another mobile router that request broker obtains from the home address that described location management server is received.

9. location management server is characterized in that:

Comprise:

The address administration table of the home address of mobile router is distributed in maintenance; With

After the request for allocation of reception from described mobile router,, and send the address assignment portion of the home address that distributes to described mobile router from the untapped address of described address administration table search.

10. location management server according to claim 9 is characterized in that:

Also have and stored the authentication list that allows to the authentication ID of mobile router home address assignment;

Described address assignment portion judges whether the authentication ID of the authentication ID of the 1st mobile router of request home address and described authentication list is consistent, when unanimity, to the 1st mobile router home address assignment, and sends described home address.

11. location management server according to claim 10 is characterized in that,

When described address assignment portion when the 1st mobile router receives that the reception of home address is replied, the home address of authentication ID and distribution associated store described address administration table into, do not allow request for allocation from the new home address of mobile router with same authentication ID.

12. location management server according to claim 10 is characterized in that,

Described address assignment portion when the 1st mobile router of the home address that distributes is received the request for allocation of home address of the 2nd mobile router, distributes new home address for the 2nd mobile router, and sends to the 1st mobile router.

13. a mobile network management system is characterized in that,

Have:

Mobile router, it comprises: the addresses distributed table that keeps home address and temporary address; Judged whether to distribute the address assignment request portion of home address according to described address table; Keep carrying out the location management server address table of address of location management server of the distribution of home address; And the address login portion that the home address received and temporary address are signed in to described address table; This mobile router, when described address assignment request portion is judged as when not having home address assignment in the described address table, carry out request for allocation to described location management server behind the additional described temporary address, described address table is updated to described address login portion from described location management server home address that receive, that be assigned with; With

Location management server, it comprises: the address administration table of the home address of mobile router is distributed in maintenance; And receive request for allocation from described mobile router, from the untapped address of described address administration table search, and the home address that distributes is sent to the address assignment portion of described mobile router.

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