JP2003153330A - Movable body communication system, and method of setting label switching path - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a movable body communication system which can set the shortest LSP having compensated QoS with the other party of communication in the case that a terminal device has shifted between sub networks. SOLUTION: In this movable body communication system, in the case that, for example, MN 1 shifts to an external sub network while it is communicating a message making use of a CN 3 stored in other sub network and an existing LSP, the MN 1 requests the recomputation of LSP from AR 5 at the destination of shifting after extension of an existing LSP to the destination of shifting of MN 1, the AR 5 at the destination of shifting requested for recomputation inquires of the home network of MN 1 about the QoS information of MN 1, and HA 2 on the home network informs it of the desired QoS information. By the instruction of AR 5 at the destination of shifting having received the desired QoS information, LSR 8 connected to the AR 5 sets a new LSP having guaranteed QoS between itself and LSR 9 on the side of CN 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to MPLS (Mult), which is a packet transfer technique using a label switching system.
The present invention relates to a mobile communication system that employs i-Protocol Label Switching (QoS), and in particular, QoS (Quality of
The present invention relates to a mobile communication system that sets a shortest Label Switching Path (LSP) that guarantees (Services), and a label switching path setting method thereof.

[0002]

2. Description of the Related Art A conventional mobile communication system will be described below. The MPLS adopted in the conventional mobile communication system is a technique for increasing the speed / capacity of bucket-relay type data transfer using a router, which is currently the mainstream in the Internet. Originally, when a router forwards a packet received from another router to another router, IP is used as routing (route selection) information.
A header is used, but in MPLS, a short fixed-length identification mark called a “label” is used.

MPLS compatible router (LSR: Label Swit)
In the network configured by the ching router), each router holds the information "which router to forward next" according to the destination of the packet, and each route is identified by the label. When the packet reaches the router at the entrance of this network, a label is added to the route information in the packet and the packet is transferred to the next router.
On the next router, look at the label on the packet,
Determine which router to forward to and send the packet to the appropriate destination. The router at the exit to the external network removes the label from the arrived packet and transfers it to the outside router. Note that LSRs are labeled as LDP (Label Di
The routing information is exchanged using a protocol called "stribution Protocol", and labels are reassigned when the route is changed.

As described above, in the mobile communication system, transfer is performed based on the label, so that the transfer processing and the route calculation processing are separated from each other, and the load on each router is reduced and the processing speed is increased. The MPLS architecture is
IETF (Internet Engineering Task Force) Inter
stipulated in net Draft "MPLS Architecture".

Further, in the above MPLS, as a procedure for setting an LSP with guaranteed QoS, for example, CR
-LDP, RSVP-TE, etc. are mentioned. Here, a setting method of an LSP that guarantees QoS using CR-LDP will be described. Note that QoS is a technique for allocating optimal bandwidth according to the purpose of communication and ensuring the response time and throughput required for each communication (low delay requirement, low delay jitter requirement, low error rate). Request). In the actual processing, the packet is relayed while considering the priority in a portion where communication is concentrated such as a router and a switch.

[0006] Further, in the Internet layer protocol, there is "Mobile IP" as a method for supporting the mobility of terminal devices. A node device (MN: Mobile Node) in this method has a home address that can uniquely identify a connection point from any node, and a subnetwork (MN) identified from a network prefix included in the home address (MN). Hereinafter, when it is connected to a "home network"), communication is executed as a normal node device. Then, when the MN moves to a sub-network other than the home network (hereinafter referred to as "external network"), a temporary address (CoA: Care o) including a network prefix for identifying the external network.
f Address) is acquired and communication is performed using CoA while connected to the external network. "Mobile that supports mobility with Internet layer protocol"
"IP" is the Internet Draft "Mobility Sup" of IETF
port in IPv6 ", RFC (Request For Comment) 2002.

Next, the MPLS and the "Mobile
A procedure for performing communication by combining with "e IP" will be described. Here, the MPLS and the "Mobi
By combining with "leIP", "Mobil
e IP "also guarantees QoS. IETF In
ternet Draft "Extension of LDP for Mobile IP Servi
ce "and" Integration of Mobile IP and MPLS "
20. FIG. 20 and FIG. 21 are diagrams showing the procedure for connecting the "bile IP" and MPLS to perform communication.

In FIG. 20, 101 is an MN, and 1
02 is an HA (Home Agent), 103 is a CN (Corr
espondent Node), 104, 105, 106 are access routers (AR), 107, 108, 10
Reference numerals 9 and 110 are LSRs.

When the MN 101 moves to a new network, it sends a router request message to obtain a CoA including the network prefix of the network (see FIG. 20). Here, the AR 105 that receives the router request from the MN sends a router advertisement.

Upon receiving the router advertisement, the MN 101 acquires a new CoA, transmits a BU (registration response request: Binding Update) to the HA 102, and registers the correspondence relationship between the CoA and the home address (see FIG. 20). MN1
01 obtains registration certainty by requesting that HA 102 return a registration response with this BU.

In the HA 102 which is requested to send the registration response, the M
The registration response is transmitted to N101 (see FIG. 20). In the LSR 108 that received the registration response, the MN 10
Existing LSP (LSR107-LSR110-L) used for communication between the MN101 and the CN103 before the mobile station 1 moves.
A route between the LSR 108 and the LSR 107 is added to the SR 109) to extend the existing LSP (see FIG. 20).
Then, the LSR 108 transfers the registration response transmitted by the HA 102 to the MN 101 (see FIG. 20).

As described above, in the conventional mobile communication system, the MN1 after moving is moved by the procedure shown in FIGS.
The LSP is set between 01 and CN 103.

[0013]

However, the above
The conventional mobile communication system has the following problems.

In the above conventional mobile communication system, there is a problem that the LSP set after the movement becomes a redundant route via the HA 102. In addition,
Internet Draft "Extension of LDP for Mobile IP Ser
"vice through the MPLS Network" describes that the shortest LSP is set by LSP recalculation. In this case, the shortest LSP is set between the LSR 110 and the LSR 108, and communication with the CN 103 is performed via the HA 102. The route (LSR108-LSR110-LSR109) is executed.

Further, in the above-mentioned conventional mobile communication system, since the MN 101 does not consider the delivery of the QoS information which is guaranteed when the MN 101 performs the communication such as the bandwidth that can be occupied by the data transmission and reception, the priority, etc. There is a problem that the LSP that guarantees the above cannot be set.

Further, in the above conventional mobile communication system, a new LS is set until the registration response indicating that the HA 102 has accepted the BU reaches the LSR 108.
There is a problem that the procedure for setting P cannot be executed. That is, HA 102 sends a registration response, and H
At the time when the packet can be transferred from A102 to the current connection point of MN101, LSR1
No LSP is set up between the 10 and the LSR 108, and data is transferred by normal hop-by-hop IP routing.

In the above conventional mobile communication system, when the MN 101 and the CN 103 communicate with each other, "the LSP for label switching the packet transmitted from the MN 101 to the CN 103" and the "CN
There is a problem that the setting procedure of "LSP for label switching of packet transmitted by 103 to MN 101" is not shown.

The present invention has been made in view of the above, and even when the terminal device moves between the sub-networks, the shortest LSP can be set with the communication partner, and the QoS can be set. It is an object to obtain a mobile communication system capable of compensating for the above, and a label switching path setting method thereof.

[0019]

[Means for Solving the Problems]
In order to achieve the object, in a mobile communication system according to the present invention, node devices (MN, CN, HA),
It is composed of a plurality of sub-networks including a label switching router (LSR) and an access router (AR) accommodating the node device, and performs communication using a label switching path (LSP) set between the node devices, For example, while communicating with the second node device (CN) accommodated in the second sub-network using the existing label switching path,
The first node device (MN), which requests recalculation of the label switching path after the existing label switching path is extended to the destination when moving from the sub-network to the external sub-network. Of the first node device to the subnetwork of
of the destination access router which inquires about the information of the service and the destination access router which receives the desired QoS information from the third node device (HA) accommodated in the first sub-network. , The second
And a label switching router accommodated in the sub-network, which sets a new label switching path with guaranteed QoS between the label switching router and the label switching router.

A mobile communication system according to the next invention comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, while the first node device accommodated in the first sub-network is communicating with the second node device accommodated in the second sub-network using the existing label switching path, the external sub-network Inquiries about the QoS information of the first node device addressed to the first sub-network when moving to a desired destination from the destination access router and the third node device accommodated in the first sub-network. The destination label that sets a new label switching path that guarantees QoS between the label switching router accommodated in the second sub-network and the instruction of the access router that receives the QoS information. And a switching router.

A mobile communication system according to the next invention comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the second node device accommodated in the second sub-network and the existing label switching path are being used for communication and the user moves to an external sub-network,
Request recalculation of the label switching path after extending the existing label switching path to the destination, the first
, And a label switching router accommodated in the second sub-network, which guarantees QoS between the node device and the label switching router accommodated in the second sub-network at the instruction of the access router of the movement destination that stores the QoS information of the first node device. And a destination label switching router that sets a different label switching path.

A mobile communication system according to the next invention comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, while the first node device accommodated in the first sub-network is communicating with the second node device accommodated in the second sub-network using the existing label switching path, the external sub-network A destination access router that stores the QoS information of the first node device that requests recalculation of the label switching path after the existing label switching path is extended to the destination when A destination label switching router that sets a new label switching path that guarantees QoS with the label switching router accommodated in the second sub-network.

A mobile communication system according to the next invention comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the second node device accommodated in the second sub-network and the existing label switching path are being used for communication and the user moves to an external sub-network,
CoA (Care of Addres) in the external network
s) is added to the first message for associating the home address with the option to inquire about the QoS information, and the option is added to the third node device accommodated in the first subnetwork which is the home network. A second message of
After receiving the desired QoS information from the node device of the
A first node device for transmitting a third message for associating a CoA and a home address to the node device of
In order to switch the data to be transmitted to the second node device by the first node device between the label switching router accommodated in the second sub-network at the instruction of the first node device. The label switching router accommodated in the second sub-network is set to the destination label switching router at the instruction of the access router accommodating the second node device. In between, a second label switching path for switching the data transmitted by the second node device to the first node device is set.

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the second node device accommodated in the second sub-network and the existing label switching path are being used for communication and the user moves to an external sub-network,
Transmitting a first message for associating a CoA and a home address in the external network to the third node device and the second node device accommodated in the first sub-network, which is a home network, 1 node device and the home address of the first node device and the destination address of the first message are compared to recognize the IP address of the third node device, and to the third node device Access destination router that inquires about the QoS information of the first node device, and the destination label switching router receives the desired QoS information from the third node device. At the instruction of the router, between the label switching router accommodated in the second sub-network, A label switching router that sets a first label switching path for the first node device to switch data transmitted to the second node device and is accommodated in the second sub-network, A second switching device for switching data to be transmitted from the second node device addressed to the first node device to the destination label switching router according to an instruction from the access router accommodating the second node device. The label switching path is set.

A mobile communication system according to the next invention comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the second node device accommodated in the second sub-network and the existing label switching path are being used for communication and the user moves to an external sub-network,
A third node device accommodated in the first sub-network, which is a home network, adding an option for inquiring about QoS information to the first message for associating the CoA and the home address in the foreign network, An access router accommodating a third node device; and a first node device for transmitting a second message after the option addition to the second node device, wherein the label switching router at the destination is the Of the third node device, the access router that accommodates the third node device, and the second node device, the node device that manages or temporarily stores the QoS information of the first node device is At the instruction of the destination access router that has received the QoS information transmitted to the first node device, A first label switching path for switching data transmitted from the first node device to the second node device is set between the label switching router accommodated in the second sub-network and the label switching router. , The label switching router accommodated in the second sub-network is instructed by the access router accommodating the second node device, and the second node device is A second label switching path for switching data to be transmitted to the first node device is set.

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the second node device accommodated in the second sub-network and the existing label switching path are being used for communication and the user moves to an external sub-network,
Transmitting a first message for associating a CoA and a home address in the external network to the third node device and the second node device accommodated in the first sub-network which is a home network, and , Notifies the address of the node device that manages its own QoS information to the access router at the movement destination,
A first node device, wherein the destination access router inquires the node device corresponding to the notified address about the QoS information of the first node device, and the destination label switching router, Desired Qo
The first node device transmits to the second node device between itself and the label switching router accommodated in the second sub-network according to an instruction from the access router of the movement destination that has received the S information. Set up a first label switching path to switch data,
The label switching router accommodated in the second sub-network is instructed by the access router accommodating the second node device, and the label switching router is moved to the destination label switching router so that the second node device is It is characterized in that a second label switching path for switching data to be transmitted to the first node device is set.

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the movement to an external sub-network is predicted during communication with the second node device accommodated in the second sub-network and the existing label switching path, the predicted movement-destination access router The CoA in the external network is acquired, the CoA is notified to the second node device using the existing label switching path, and the third sub-network accommodated in the first sub-network, which is the home network, is further notified. A first message for associating a CoA and a home address, which are optionally notified, is transmitted to the node device, and further, the first message of the second node device is transmitted to the access router accommodated in the first subnetwork. A first node device for transmitting a second message specifying an IP address, The access router accommodated in the first sub-network adds the QoS information of the first node device to the received second message, and the third router after the QoS information is added to the predicted access destination access router. The label switching router accommodated in the second sub-network, which has transmitted the message, receives the CoA of the first node device, and receives an instruction from the access router that accommodates the second node device. A first provisional label switching path for switching data transmitted from the second node device to the first node device is set between the label switching router and the label switching router,
If the label switching router of the predicted destination is QoS
At the instruction of the predicted destination access router that has received the third message after the addition of the information, the first node device sets the second node between the label switching router and the label switching router accommodated in the second sub-network. Second temporary label switching path for switching the data to be transmitted to the node device of
The first node device transmits a fourth message to the third node device, the second node device, and the access router accommodated in the first sub-network, and at this point, the existing label is sent. The switching path is switched to the temporary label switching path.

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the movement to an external sub-network is predicted during communication with the second node device accommodated in the second sub-network and the existing label switching path, the predicted movement-destination access router The CoA in the external network is obtained, the CoA is notified to the second node device using the existing label switching path, and the third sub-network accommodated in the first sub-network, which is the home network, is further notified. A first message for associating the CoA and the home address, which are optionally notified, is transmitted to the node device, and further, the second message is transmitted to the access router of the predicted movement destination.
A first node device for transmitting a second message that clearly indicates the IP address of the node device, and the access router accommodated in the first sub-network Access router to C
At the same time as acquiring the oA, the Qo of the first node device is acquired.
The label switching router that notifies the access router of the predicted movement destination of the S information and that is accommodated in the second sub-network accommodates the second node device that has received the CoA of the first node device. At the instruction of the access router, a first provisional label switching path for switching the data to be transmitted from the second node device to the first node device is set between the label switching router of the predicted destination and the label switching router. Then, the label switching router of the predicted movement destination is accommodated in the second subnetwork according to the instruction of the access router of the predicted movement destination that has received the second message that clearly indicates the IP address of the second node device. The first node device transmits to the second node device between the second node device and the label switching router After setting the second temporary label switching path for switching the data and moving to the predicted movement destination, the first node device is configured such that the third node device, the second node device, and the second node device. A third message is transmitted to the access router accommodated in the first sub-network, and the existing label switching path is switched to the temporary label switching path at this point.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When moving to an external sub-network during communication with the second node device (CN) accommodated in the network using the existing label switching path, the existing label switching path is moved to the destination of the first node device. After the extension, the first node device
A recalculation request step for requesting the recalculation of the label switching path to the destination access router, and the destination access router requested to recalculate the first node to the home network of the first node device. Device Qo
Q inquiring about S information, and the third node device (HA) on the home network notifying the desired QoS information
According to the S information acquisition step and the instruction of the destination access router that has received the desired QoS information, the label switching router connected to the access router establishes the QoS with the label switching router on the second node device side. And a label switching path setting step for setting a guaranteed new label switching path.

In the label switching path setting method according to the next invention, node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When moving to an external subnetwork during communication with the second node device (CN) accommodated in the network using the existing label switching path, the access router of the movement destination is the home of the first node device. A QoS information acquisition step of inquiring the QoS information of the first node device to the network, and the third node device (HA) on the home network notifying the desired QoS information, and a destination to which the desired QoS information is received. Of the access router of the second node device side, the label switching router connected to the access router of the second node device Qo between the Le switching router
And a label switching path setting step of setting a new label switching path that guarantees S.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When moving to an external sub-network during communication with the second node device (CN) accommodated in the network using the existing label switching path, the existing label switching path is moved to the destination of the first node device. After the extension, the first node device
The re-calculation request step of requesting re-calculation of the label switching path to the destination access router and the instruction of the destination access router storing the QoS information of the first node device are connected to the access router. And a label switching path setting step of setting a new label switching path with guaranteed QoS between the label switching router and the label switching router on the second node device side.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When moving to an external sub-network during communication with the second node device (CN) accommodated in the network using the existing label switching path, the existing label switching path is moved to the destination of the first node device. After extension, Q of the first node device
The re-calculation request step in which the destination access router storing the oS information requests re-calculation of the label switching path to the label switching router connected to the access router, and the label switching requested to re-calculate. The router further includes a label switching path setting step of setting a new label switching path with guaranteed QoS between the router and the label switching router on the second node device side.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the second node device (CN) accommodated in the network is moved to the external sub-network during communication using the existing label switching path, the first node device causes the CoA (temporary) in the external network. The first message (BU) for associating the home address with the
Add an option to inquire about QoS information,
The first transmission step of transmitting the second message (BU) after the option addition to the third node device (HA) on the home network, and the third node device receiving the second message, A QoS information transmitting step of transmitting the QoS information to the first node device, and a third message (B) for the first node device to associate the CoA and the home address with the second node device.
U) second transmission step, and desired QoS
When the label switching router connected to the destination access router receives the information and the label switching router on the side of the second node device instructs the first node device to perform the second The first label switching path setting step for setting the first label switching path for switching the data to be transmitted to the node device of the second node device, and the instruction of the access router accommodating the second node device, A second label switching path for connecting the connected label switching router to the label switching router on the side of the first node device for switching the data transmitted by the second node device to the first node device. Second to set
And a label switching path setting step.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the second node device (CN) accommodated in the network is moved to an external sub-network during communication using the existing label switching path, the first node device causes the third node on the home network to A transmission step of transmitting a first message (BU) for associating a CoA (temporary address) and a home address in the external network to the node device (HA) and the second node device; The destination access router that houses the device
The IP address of the third node device is recognized by comparing the home address of the first node device with the destination address of the first message, and the QoS information of the first node device is sent to the third node device. And a third node device that receives the inquiry inquires the desired QoS information, and a desired QoS information acquisition step and a desired QoS information.
When the label switching router connected to the access router receives the information, the label switching router connected to the access router and the label switching router on the second node device side cause the first node device to operate as the second node. The first label switching path setting step for setting the first label switching path for switching the data to be transmitted to the device and the instruction of the access router accommodating the second node device are connected to the access router. And a label switching router on the side of the first node device, sets a second label switching path for switching data transmitted to the first node device by the second node device. Second
And a label switching path setting step.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the second node device (CN) accommodated in the network is moved to the external sub-network during communication using the existing label switching path, the first node device causes the CoA (temporary) in the external network. The first message (BU) for associating the home address with the
Add an option to inquire about QoS information,
A third node device (HA) on the home network, an access router accommodating the third node device, and a transmission step of transmitting a second message (BU) after the option addition to the second node device. Managing or temporarily managing the QoS information of the first node device of the third node device receiving the second message, the access router accommodating the third node device, and the second node device. The stored node device is connected to the access router according to the QoS information transmitting step of transmitting the QoS information to the first node device and the instruction of the destination access router that has received the desired QoS information. Between the label switching router and the label switching router on the second node device side, the first node device is addressed to the second node device. The setting a first label switching path for switching data to be transmitted to the 1
Of the label switching path and the instruction of the access router accommodating the second node device, between the label switching router connected to the access router and the label switching router on the side of the first node device. A second label switching path setting step for setting a second label switching path for switching data transmitted from the second node apparatus to the first node apparatus.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the second node device (CN) accommodated in the network is moved to an external sub-network during communication using the existing label switching path, the first node device causes the third node on the home network to A transmission step of transmitting a first message (BU) for associating a CoA (temporary address) and a home address in the external network to the node device (HA) and the second node device; The device notifies the destination access router of the address of the node device that manages its own QoS information, and the first node The destination access router accommodating the storage device inquires the notified node device about the QoS information of the first node device, and the node device receiving the inquiry notifies the desired QoS information to the QoS information acquisition step. And a label switching router connected to the access router at the instruction of the destination access router that has received the desired QoS information between the label switching router on the second node device side and the first node device. By a first label switching path setting step for setting a first label switching path for switching data to be transmitted to the second node device and an instruction from an access router accommodating the second node device. The label switching router connected to the access router changes the label switch on the side of the first node device. A second label switching path setting step for setting a second label switching path for switching data transmitted from the second node apparatus to the first node apparatus, between the router and the router. Is characterized by.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the movement to the external sub-network is predicted during communication with the second node device (CN) accommodated in the network using the existing label switching path, the first node device is A CoA acquisition step of acquiring a CoA (temporary address) in the external network from the access router, and the first node device that has acquired the CoA sends the CoA to the second node device using the existing label switching path. The CoA notification step of notifying, and the first node device addressed to the third node device (HA) on the home network. First message (B for associating the CoA and the home address reported by a Deployment
U) is transmitted, and the first node device transmits a second message (BU) specifying the IP address of the second node device to the access router on the home network, Further, the access router on the home network adds the QoS information of the first node device to the received second message, and the third message (BU after adding the QoS information to the access router of the predicted movement destination). ) Sending a second sending step,
When the label switching router connected to the access router, which receives the CoA of the first node device and accommodates the second node device, causes the label switching router connected to the access router to make a second A first label switching path setting step for setting a first provisional label switching path for switching the data transmitted from the node device to the first node device,
The label switching router connected to the access destination router, which has received the third message after the addition of the QoS information, receives a third message from the label switching router connected to the access router. A second label switching path setting step of setting a second temporary label switching path for switching data to be transmitted from the first node device to the second node device; The node device is the third
Message (BU) addressed to the node device of the second node device and the access router of the home network
And a third transmitting step of switching the existing label switching path to the temporary label switching path at this point.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the movement to the external sub-network is predicted during communication with the second node device (CN) accommodated in the network using the existing label switching path, the first node device is At the same time that the CoA (temporary address) in the external network is acquired from the access router, the access router on the home network simultaneously acquires the QA of the first node device.
A CoA acquisition step of notifying the access router of the predicted movement destination of the oS information, and the first node device that has acquired the CoA notifies the second node device of the CoA by using the existing label switching path. A notification step, the first node device sending a first message (BU) for associating the CoA and the home address, which are optionally notified, to the third node device (HA) on the home network. 1 transmission step,
A second transmission step in which the first node device transmits a second message (BU) specifying the IP address of the second node device to the access router of the predicted movement destination;
When the label switching router connected to the access router, which receives the CoA of the first node device and accommodates the second node device, causes the label switching router connected to the access router to make a second A first label switching path setting step for setting a first provisional label switching path for switching the data transmitted from the node device to the first node device,
The label switching router connected to the access router of the predicted movement destination receives the second message in which the IP address of the second node device is explicitly received, and the label switching router connected to the access router is the label switching router of the second node device side. And a second label switching path setting step for setting a second temporary label switching path for switching data transmitted from the first node apparatus to the second node apparatus, and a predicted destination After moving to, the first node device sends a third message (BU) to the third node device, the second node device, and the access router on the home network. At this point, the existing label switching path is sent. Is transmitted to the temporary label switching path, the third transmitting step is included.

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the movement to an external sub-network is predicted during communication with the second node device accommodated in the second sub-network and the existing label switching path, the predicted movement-destination access router The CoA in the external network is acquired, and further the C is addressed to the second node device and the third node device accommodated in the first sub-network which is the home network.
a first node device, which transmits a first message including oA, and further transmits a second message to the access router of the predicted movement destination, the second message specifying the IP address of the second node device. The label switching router accommodated in the second sub-network is the first
Data transmitted to the first node device by the second node device between the label switching router of the predicted movement destination and the instruction of the access router accommodating the second node device receiving the message A first provisional label switching path for switching the first node device from the home address of the first node device included in the second message received by the access router of the predicted movement destination. Identifies the home network to which the node belongs, acquires the QoS information of the first node device from the home network, and the label switching router of the predicted movement destination is instructed by the access router of the predicted movement destination that learned the QoS information. , Between the label switching router accommodated in the second sub-network, the first The second node device sets a second temporary label switching path for switching the data to be transmitted to the second node device, and after moving to the predicted destination, the first node device sets the third temporary label switching path. A third message is transmitted to the node device, the second node device, and the access router accommodated in the first subnetwork, and at this point, the existing label switching path is switched to the temporary label switching path. And

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the movement to an external sub-network is predicted during communication with the second node device accommodated in the second sub-network and the existing label switching path, the predicted movement-destination access router The CoA in the external network is acquired, and further the C is addressed to the second node device and the third node device accommodated in the first sub-network which is the home network.
a label switching router accommodated in the second sub-network, the first node device transmitting a first message including an oA, accommodating the second node device receiving the first message. The first provisional label switching path for switching the data transmitted to the first node device by the second node device is provided between the label switching router of the predicted movement destination and the label switching router of the predicted movement destination. The access router accommodated in the first sub-network sets the home address of the first node device and the IP address of the second node device to the predicted destination access router. From the home address of the first node device received by the access router of the predicted movement destination, the first node device Identify the home network and,
Q of the first node device from the home network
and the label switching router of the predicted movement destination, at the instruction of the predicted movement destination access router that has learned the QoS information, between the label switching router accommodated in the second sub-network, The first node device sets a second temporary label switching path for switching data to be transmitted to the second node device, and after moving to a predicted movement destination, the first node device is A second message is transmitted to the third node device and the second node device, and at this point, the existing label switching path is switched to the temporary label switching path.

In the mobile communication system according to the next invention, the mobile communication system comprises a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device. Communication is performed using the set label switching path,
For example, when the movement to an external sub-network is predicted during communication with the second node device accommodated in the second sub-network and the existing label switching path, the predicted movement-destination access router The CoA in the external network is acquired, and further, the first node device that has acquired the CoA is addressed to the second node device and the third node device accommodated in the first sub-network which is the home network. , A first node device transmitting a first message including the CoA,
And a label switching router accommodated in the second sub-network, between the label switching router of the predicted movement destination, at the instruction of the access router accommodating the second node device that has received the first message. To
The access router accommodated in the first sub-network is configured to set the first provisional label switching path for switching the data transmitted from the second node device to the first node device. The destination access router is notified of the IP address of the second node device and the QoS information of the first node device,
If the label switching router of the predicted destination is QoS
The first node device transmits to the second node device between itself and the label switching router accommodated in the second sub-network according to the instruction of the predicted access destination access router that has learned the information. After setting a second provisional label switching path for switching data and moving to a predicted movement destination, the first node device sends a second packet to the third node device and the second node device.
Is sent, and the existing label switching path is switched to the temporary label switching path at this point.

In the mobile communication system according to the next invention, when the first message to the third node device is normally accepted, the access router accommodated in the first sub-network is The IP address of the second node device and the QoS information of the first node device are notified to the access router of the predicted movement destination.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the movement to the external sub-network is predicted during communication with the second node device (CN) accommodated in the network using the existing label switching path, the first node device is From the access router, the CoA acquisition step of acquiring the CoA in the external network, and the first node device that has acquired the CoA are addressed to the second node device and the third node device (HA) on the home network. A first transmission step of transmitting a first message (BU) including CoA, and the first node device accessing the predicted movement destination IP of the second node device over data addressed
A second sending step of sending a second message specifying an address, and a second step of receiving the first message
At the instruction of the access router accommodating the node device of, the label switching router connected to the access router, and the label switching router of the predicted movement destination,
A first label switching path setting step of setting a first provisional label switching path for switching data transmitted from the second node apparatus to the first node apparatus, and an access router of a predicted movement destination receive The QoS information acquisition for identifying the home network to which the first node device belongs from the home address of the first node device included in the second message and acquiring the QoS information of the first node device from the home network. And the label switching router connected to the access router according to the instruction of the predicted access destination access router that has learned the QoS information, the first node is connected between the label switching router on the second node device side. A second device for switching data transmitted by the device to the second node device. A second label switching path setting step of setting a temporary label switching path, and after moving to a predicted destination, the first node device addresses the third node device, the second node device, and the access router on the home network. And a third transmission step of transmitting the third message (BU), and switching the existing label switching path to the temporary label switching path at this time.

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the movement to an external sub-network is predicted during communication with the second node device (CN) accommodated in the network and the existing label switching path (LSP), the first node device predicts A CoA acquisition step of acquiring a CoA in the external network from the access router of the movement destination, and the first node device which has acquired the CoA is addressed to the second node device and the third node device (HA) on the home network. A first sending step of sending a first message (BU) containing the CoA, and receiving the first message. At the instruction of the access router accommodating the second node device, the second node device is addressed to the first node device between the label switching router connected to the access router and the label switching router of the predicted movement destination. A first label switching path setting step of setting a first provisional label switching path for switching data to be transmitted, and further, the access router on the home network sends the first temporary label switching path to the predicted access destination access router. An address notification step of notifying the home address of the node device and the IP address of the second node device, and the access router of the predicted movement destination, to which the first node device belongs from the home address of the first node device received. Identify your home network,
Q of the first node device from the home network
QoS information acquisition step of acquiring QoS information, and the above-mentioned Q
When the label switching router connected to the predicted access destination access router that has learned the oS information has the label switching router connected to the access router and the label switching router on the second node device side, the first node device is the second node device. Second label switching path setting step for setting a second provisional label switching path for switching data to be transmitted to the node device, and after moving to the predicted movement destination, the first node device A second transmission step of transmitting a second message (BU) to the node device and the second node device, and switching the existing label switching path to the temporary label switching path at this time. .

In the label switching path setting method according to the next invention, the node devices (MN, CN, H
A), a label switching router (LSR), and an access router (AR) accommodating the node device, for example, a movable first node device (MN) is connected to another sub network. When the movement to an external sub-network is predicted during communication with the second node device (CN) accommodated in the network and the existing label switching path (LSP), the first node device predicts A CoA acquisition step of acquiring a CoA in the external network from the access router of the movement destination, and the first node device which has acquired the CoA is addressed to the second node device and the third node device (HA) on the home network. A first sending step of sending a first message (BU) containing the CoA, and receiving the first message. At the instruction of the access router accommodating the second node device, the second node device is addressed to the first node device between the label switching router connected to the access router and the label switching router of the predicted movement destination. A first label switching path setting step of setting a first temporary label switching path for switching data to be transmitted, and further, an access router on the home network sends a second temporary address to the predicted access destination access router. Address for notifying IP address of node device and QoS information of first node device /
The QoS information notification step and the label switching router connected to the access destination router, which has learned the QoS information, is connected between the label switching router and the label switching router on the side of the second node device according to the instruction. A second label switching path setting step of setting a second temporary label switching path for switching data to be transmitted from the first node device to the second node device; Node device
A second transmission step of transmitting a second message (BU) addressed to the third node device and the second node device, and switching the existing label switching path to the temporary label switching path at this point. Characterize.

In the label switching path setting method according to the next invention, when the first message to the third node device is normally accepted in the first transmitting step, the address / QoS information notifying step is performed. The access router on the home network performs the notification processing.

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a mobile communication system and a label switching path setting method according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited to this embodiment.

Embodiment 1. 1 and 2 are diagrams showing a label switching path (LSP) setting method of a first embodiment in a mobile communication system according to the present invention. In FIG. 1, 1 is a MN (Mobile Node),
2 is HA (Home Agent), 3 is CN (Correspond
ent Node), and 4, 5 and 6 are access routers (A
R), and 7, 8, 9, and 10 are LSRs (label switching routers).

In the mobile communication system of the present invention (including the following embodiments), MPLS (Mu) which is a packet transfer technique using the label switching system is used as in the conventional case.
lti-Protocol Label Switching) is adopted. And
It is assumed that the node device (MN) that can move while continuing the communication is communicating with the node device (CN) accommodated in another sub-network via the MPLS network.

In the present embodiment, when the MN1 moves to another sub-network, the existing LSP (LSR7-
LSR10-LSR9) is extended (LSR8-LSR7-
LSR10-LSR9), and MN1 newly transmits an LSP recalculation request, and sets the shortest LSP (LSR8-LSR9) with guaranteed QoS between MN1 and CN3.

The LSP setting method shown in FIGS. 1 and 2 will be described below. First, after the existing LSP is extended by the same method as in the conventional technique, the MN 1 transmits an LSP recalculation request to the AR 5 in order to set the shortest LSP with the CN 3 (FIGS. 1 and 2). See). In this LSP recalculation request, the IP address of CN3 is specified in order to identify the LSR 9 that is the partner with which the shortest LSP is set.

Next, the AR 5, which has received the LSP recalculation request transmitted by the MN 1, determines the home network of the MN 1 by the network prefix included in the home address of the MN 1 and inquires the home network of the MN 1's QoS information. Then, in HA2 on the home network that received the inquiry,
The QoS information of MN1 is notified to AR5 (see FIGS. 1 and 2).

Next, in AR5, the IP address of CN3 learned in the above procedure and the MN learned in the above procedure
And a CR-LDP execution request including the QoS information of 1.
Send to LSR 8 (see FIGS. 1 and 2).

Next, the LSR8 that has received the CR-LDP execution request executes the CR-LDP, and the LSR8 and the LS
Set the shortest LSP that guarantees QoS between R9 (Fig. 2
Corresponding to the label request and the label mapping: (see FIGS. 1 and 2).

Finally, the LSR8 transfers the LSP recalculation response to the MN1 via the AR5 (see FIGS. 1 and 2).

As described above, in the present embodiment, M
When N1 moves to another sub-network, the procedure shown in FIG.
A new LSP is set by performing the shortest LSP setting process and the LSP recalculation response process. As a result, the shortest LSP can be set with the communication partner CN3. Furthermore, by acquiring the QoS information of MN1 from HA2, the shortest LSP with guaranteed QoS can be obtained.
Can be set.

Embodiment 2. 3 and 4 show L of the second embodiment in the mobile communication system according to the present invention.
It is a figure which shows SP setting method. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In the present embodiment, when the MN1 moves to another sub-network, the existing LSP (LSR7-
LSR10-LSR9) is extended (LSR8-LSR7-
LSR10-LSR9), and AR5 newly transmits the LSP recalculation request, and sets the shortest LSP (LSR8-LSR9) with guaranteed QoS between MN1 and CN3.

The LSP setting method shown in FIGS. 3 and 4 will be described below. First, after the existing LSP is extended by the same method as the conventional technique, the AR 5 determines the home network of the MN 1 by the network prefix included in the home address of the MN 1 and inquires the home network of the MN 1's QoS information.
Then, in HA2 on the home network of MN1,
In response to the inquiry about the QoS information, the MN is addressed to the AR5.
No. 1 QoS information is notified (see FIGS. 3 and 4).

Next, in the AR5, the IP address of the CN3 is analyzed from the IP packet transmitted and received by the MN1, and the IP address of the CN3 and the MN acquired by the above procedure are analyzed.
The CR-LDP execution request including the QoS information of 1 is L
Send to SR8 (see FIGS. 3 and 4).

Next, the LSR8 that has received the CR-LDP execution request executes the CR-LDP, and the LSR8 and the LS
Set the shortest LSP that guarantees QoS between R9 (Fig. 4
Corresponding to the label request and label mapping of: (see FIGS. 3 and 4).

Finally, the LSR8 transfers the LSP recalculation response to the AR5 (see FIGS. 3 and 4).

As described above, in the present embodiment, M
When N1 moves to another sub-network, the procedure shown in FIG.
CR-LDP execution request processing, shortest LSP setting processing, LS
P recalculation response process
Is set. As a result, the MN 1 can set the shortest LSP with guaranteed QoS with the CN 3 that is the communication partner without making a LSP recalculation request by the network.

Third Embodiment 5 and 6 show L of the third embodiment in the mobile communication system according to the present invention.
It is a figure which shows SP setting method. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In this embodiment, when the MN1 moves to another sub-network, the same method as the conventional technique is used to reach the destination of the MN1 to the existing LSP (LSR7-).
LSR10-LSR9) is extended (LSR8-LSR7-
LSR10-LSR9), and MN1 newly transmits an LSP recalculation request, and sets the shortest LSP (LSR8-LSR9) with guaranteed QoS between MN1 and CN3.

The LSP setting method shown in FIGS. 5 and 6 will be described below. First, after the existing LSP is extended by the same method as the conventional technique, the MN 1 transmits an LSP recalculation request to the AR 5 in order to set the shortest LSP with the CN 3 (FIGS. 5 and 6). See). In this LSP recalculation request, the IP address of CN3 is specified in order to identify the LSR 9 that is the partner with which the shortest LSP is set.

Next, in the AR5, the IP address of the CN3 obtained in the above procedure and the MN stored in the AR5 are stored.
And a CR-LDP execution request including the QoS information of 1.
Send to LSR8 (see FIGS. 5 and 6).

Next, the LSR8 that has received the CR-LDP execution request executes CR-LDP, and the LSR8 and the LS
The shortest LSP that guarantees QoS is set between R9 (Fig. 6).
Corresponding to the label request and label mapping of: (see FIGS. 5 and 6).

Finally, the LSR8 transfers the LSP recalculation response to the MN1 via the AR5 (see FIGS. 5 and 6).

As described above, in the present embodiment, M
When N1 moves to another sub-network, the procedure shown in FIGS. 5 to 5, namely, LSP recalculation request processing, CR-LDP execution request processing, shortest LSP setting processing,
By performing LSP recalculation response processing,
The configuration is such that SP is set, and further, AR5 is Q of MN1.
The configuration is such that the oS information can be temporarily stored. As a result, the shortest LSP with guaranteed QoS can be set without inquiring HA2 about the QoS information of MN1.

Fourth Embodiment 7 and 8 show L of the fourth embodiment in the mobile communication system according to the present invention.
It is a figure which shows SP setting method. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In the present embodiment, when the MN1 moves to another sub-network, the existing LSP (LSR7-
LSR10-LSR9) is extended (LSR8-LSR7-
LSR10-LSR9), and AR5 newly transmits the LSP recalculation request, and sets the shortest LSP (LSR8-LSR9) with guaranteed QoS between MN1 and CN3.

The LSP setting method shown in FIGS. 7 and 8 will be described below. First, after the existing LSP is extended by the same method as the conventional technique, the AR5 analyzes the IP address of the CN3 from the IP packet transmitted and received by the MN1, and the IP address of the CN3 and the MN1 stored by the AR5 are stored. The CR-LDP execution request including the QoS information is transmitted to the LSR 8 (see FIGS. 7 and 8).

Next, the LSR8 that has received the CR-LDP execution request executes CR-LDP, and the LSR8 and the LS
Set the shortest LSP with guaranteed QoS between R9 (Fig. 8
Corresponding to the label request and label mapping of: (see FIGS. 7 and 8).

Finally, the LSR8 transfers the LSP recalculation response to the AR5 (see FIGS. 7 and 8).

As described above, in the present embodiment, M
When N1 moves to another sub-network, a new LSP is set by the procedure shown in FIG. Configuration,
Further, the AR 5 is configured to be able to temporarily store the QoS information of the MN 1. As a result, the MN1 does not send the LSP recalculation request, and the MN1's Qo is sent to the HA2.
The shortest LSP with guaranteed QoS can be set without inquiring about S information.

Embodiment 5. 9 and 10 are diagrams showing the LSP setting method of the fifth embodiment in the mobile communication system according to the present invention. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In this embodiment, the MN 1 moves to the destination (A
R5), the shortest LSP that guarantees QoS (LSR)
8-LSR9) between CN3 and MN
L for label switching packets from 1 to CN3
Both SP and LSP which label-switches the packet from CN3 to MN1 are set.

The LSP setting method shown in FIGS. 9 and 10 will be described below. First, when moving to an external network, the MN 1 transmits a router request message in order to acquire the CoA in that network. Here, the AR 5, which receives the router request from the MN 1, transmits the router advertisement (see FIGS. 9 and 10).

Next, in MN1 which has acquired CoA, H
A BU (Binding Update), which is a message for associating the CoA with the home address, is transmitted to A2. At this time, an option for inquiring about QoS is added to the BU addressed to HA2. Then, upon receiving the BU including the option, HA2 transmits the QoS information to MN1 (see FIGS. 9 and 10).
Furthermore, MN1 transmits BU to CN3 (see FIGS. 9 and 10).

Next, the MN1 uses the QoS information obtained in the above procedure and the IP address of the CN3,
Shortest LSP between LSR8 and LSR9 for AR5
Send a request to set. Then, AR5 transmits a CR-LDP execution request to LSR8 (see FIGS. 9 and 10).

Next, the LSR8 that has received the CR-LDP execution request executes CR-LDP, and the MN1 sends CN3.
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR8 and LSR
9 (corresponding to the label request and label mapping in FIGS. 9 and 10).

Next, according to the above procedure, the BU (MN1 C
In AR6 notified of (including oA), CN3 to MN
CR to LSR9 to set LSP to 1
-Send an LDP execution request (see FIGS. 9 and 10). Note that the QoS information from CN3 to MN1 is A
It is managed by R6.

Finally, the LSR9 which has received the CR-LDP execution request executes CR-LDP, and CN3 makes MN1.
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR9 and LSR
8 (corresponding to label request and label mapping in FIGS. 9 and 10).

As described above, in the present embodiment, M
When N1 moves to another sub-network, according to the procedure shown in FIG.
A new LSP is set by performing the P setting process. As a result, the shortest LSP with guaranteed QoS can be set with the communication partner triggered by the registration procedure (BU) issued at the destination. Further, the bidirectional LSP setting process makes it possible to easily set the LSP for label switching the packet from the MN1 to the communication partner and the LSP for label switching the packet from the communication partner to the MN1. .

Sixth Embodiment 11 and 12 show a sixth embodiment of the mobile communication system according to the present invention.
FIG. 6 is a diagram showing an LSP setting method of FIG. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In this embodiment, the MN 1 moves to the destination (A
R5), the shortest LSP that guarantees QoS (LSR)
8-LSR9) between CN3 and MN
L for label switching packets from 1 to CN3
Both SP and LSP which label-switches the packet from CN3 to MN1 are set.

Hereinafter, the LSP setting method shown in FIGS. 11 and 12 will be described. First, when moving to an external network, the MN 1 transmits a router request message in order to acquire the CoA in that network. Here, AR5 that receives the router request from MN1 transmits a router advertisement (see FIGS. 11 and 12).

Next, in MN1 which has acquired CoA, H
BU is sent to A2 and CN3 (see FIG. 11 and FIG. 1).
2). At this time, the BU is in communication with CN3.
Include the IP address of.

Next, in AR5, the MN
1 recognizes the IP address of HA2 by comparing the destination of the BU sent by 1 with the home address of MN1, and inquires HA2 of the QoS of MN. Then, the HA2 that receives this inquiry transmits the QoS information to the AR5 (see FIGS. 11 and 12).

Next, in the AR5, the CR-LDP execution request including the QoS information acquired in the above procedure and the IP address of the CN3 included in the BU in the above procedure is sent to the LS.
Transmit to R8 (see FIGS. 11 and 12).

Next, the LSR8 which has received the CR-LDP execution request executes CR-LDP, and the MN1 sends CN3.
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR8 and LSR
9 and 9 (corresponding to the label request and label mapping in FIGS. 11 and 12).

Next, BU (MN1 C
In AR6 notified of (including oA), CN3 to MN
CR to LSR9 to set LSP to 1
-Send an LDP execution request (see FIGS. 11 and 12). Note that the QoS information from CN3 to MN1 is A
It is managed by R6.

Finally, the LSR9 which has received the CR-LDP execution request executes CR-LDP, and CN3 makes MN1.
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR9 and LSR
And 8 (corresponding to the label request and label mapping in FIGS. 11 and 12).

As described above, in the present embodiment, M
When N1 moves to another sub-network, according to the above procedure steps 11 to 11, namely, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing the P setting process. As a result, the shortest LSP with guaranteed QoS can be set with the communication partner triggered by the registration procedure (BU) issued at the destination. Further, the bidirectional LSP setting process makes it possible to easily set the LSP for label switching the packet from the MN1 to the communication partner and the LSP for label switching the packet from the communication partner to the MN1. .

Seventh Embodiment 13 and 14 show a seventh embodiment of the mobile communication system according to the present invention.
FIG. 6 is a diagram showing an LSP setting method of FIG. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

Here, the LSP shown in FIG. 13 and FIG.
The setting method will be described. In the present embodiment,
The QoS information transfer processing (procedure) different in operation from the above-described sixth embodiment will be described.

In MN1 which has acquired CoA in the procedure,
BU is sent to HA2, CN3, and AR4 (FIG. 13).
And FIG. 14). At this time, BU includes the IP address of the communicating CN 3 and the notification request of the QoS information.

Of the nodes (HA2, CN3, AR4) that received the BU sent by MN1 in the above procedure, MN
The node that manages or temporarily stores the QoS information of 1 responds to the notification request of the QoS information and notifies the AR 5 of the QoS information (see FIGS. 13 and 14).

As described above, in the present embodiment, M
When N1 moves to another sub-network, according to the above procedure steps 11 to 11, namely, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
By performing the P setting process, a new LSP is set, and further, the QoS information of the MN 1 is acquired from any one node device that is managed or temporarily stored. As a result, the shortest LSP with guaranteed QoS can be set with the communication partner triggered by the registration procedure (BU) issued at the destination. Also,
LSP for label switching of packets from MN1 to the communication partner by bidirectional LSP setting processing
And the LSP for label switching the packet from the communication partner to the MN1 can be easily set.

Eighth Embodiment 15 and 16 show an eighth embodiment of the mobile communication system according to the present invention.
FIG. 6 is a diagram showing an LSP setting method of FIG. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

Here, the LSP shown in FIG. 15 and FIG.
The setting method will be described. In the present embodiment,
A QoS information transfer process (procedure) different in operation from the above-described sixth embodiment will be described.

The MN1 notifies the address of the AR4, which temporarily manages its own QoS information, to the AR5.
The AR5 inquires about the QoS information of the MN1 addressed to the notified AR4. Then, in response to the inquiry, AR4 notifies the QoS information of MN1 to AR5 (see FIGS. 15 and 16).

As described above, in the present embodiment, M
When N1 moves to another sub-network, according to the above procedure steps 11 to 11, namely, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing the P setting process, and the QoS information of MN1 is acquired from the adjacent AR. As a result, when the registration procedure (BU) issued at the destination is used, the Q
The shortest LSP that guarantees oS can be set.
In addition, by bidirectional LSP setting processing, L for packet label switching of packets from MN1 to the communication partner.
The SP and the LSP for label switching the packet from the communication partner to the MN1 can be easily set.

Ninth Embodiment 17 and 18 show a ninth embodiment of the mobile communication system according to the present invention.
FIG. 6 is a diagram showing an LSP setting method of FIG. Since the configuration of the mobile communication system is the same as that of the first embodiment described above, the same reference numerals are given and the description thereof is omitted.

In the present embodiment, the MN1 predicts the destination (domain including AR5) before moving, and the LSP (QoS) required for registration at the destination and QoS required for communication after moving ( Seamless communication is realized by setting the LSR8-LSR9) in advance. Also, existing L
LS is notified by using SP (LSR7-LSR9) to notify CN3 of the CoA used at the destination.
Speed up the execution of CR-LDP from R9 to LSR8.

Hereinafter, the LSP setting method shown in FIGS. 17 and 18 will be described. The MN 1 that has predicted the movement destination before moving moves to AR 4 a router request including an AP (access point) identifier for identifying the movement destination domain. Upon receipt of the router request containing the AP identifier from MN1, AR4 transfers the router request to the domain (AR5) predicted by MN1 as the destination. When AR5 receives the router request, M
A router advertisement is sent to N1 (see FIGS. 17 and 18).
reference).

Next, the MN1 which has acquired the new CoA by the above procedure notifies the CoA to the CN3 using the existing LSP (see FIGS. 17 and 18).
BUs are typically parsed / stored at all routers along the route to their destination, which can cause delays and can be unreachable. However, in the present embodiment, CoA is transmitted via the LSP currently used for communication.
Since the notification of the CoA is possible, the CoA can be reliably notified to the CN3. In addition, CN3 notified of CoA of MN1
This is stored as “Secondary CoA”.

Next, MN1 transmits BU to HA2 (see FIGS. 17 and 18). At this point, the MN1 has not moved yet, so that the node receiving the BU does not start communication using the new CoA, "Al" of "Mobile IPv6".
C using the "local CoA" option
Send oA. When HA2 receives the BU, "Alt
C notified by the "enertive CoA" option
Store oA as "Secondary CoA".

Further, at the same time as the above procedure, MN1 transmits BU to AR5 (FIGS. 17 and 18).
reference). Here, the IP address of CN3 that is in communication is specified, and it is communicated that it is necessary to set an LSP that guarantees QoS with CN3. Further, in the AR4 that receives and transfers the BU, the stored QoS information of the MN1 is added to the AR5. AR receiving BU
In 5, the QoS information of MN1 is stored.

Next, in the AR6 which received the CoA of the MN1 in the above procedure, the CR- from the LSR9 to the LSR8 is sent.
The LDP execution request is transmitted to the LSR 9 (see FIGS. 17 and 18). In addition, Q from CN3 to MA1 direction
AR6 manages the oS information.

Next, the LSR 9 which has received the CR-LDP execution request executes the CR-LDP, and the CN 3 makes the MN 1
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR9 and LSR
8 (corresponding to the label request and label mapping in FIGS. 17 and 18).

Next, BU (CN3 I
A including the P address and the QoS information of MN1)
The R5 transmits a CR-LDP execution request to the LSR8 in order to set the LSP from the LSR8 to the LSR9 (see FIGS. 17 and 18).

Next, the LSR8 that has received the CR-LDP execution request executes CR-LDP, and the MN1 sends CN3.
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR8 and LSR
9 (corresponding to the label request and label mapping in FIGS. 17 and 18).

After moving to the predicted destination, MN1 goes to H
"Alternative" addressed to A2, CN3, and AR4
Send a normal BU without the "e CoA" option (see Figure 18). The CoA contained in this BU is
This is the address that was previously used as "Alternative CoA". The IP address of AR4 is MN1.
It can be obtained from the BU transmission list of “Mobile IPv6” managed by itself.

AR4, which has received the BU, recognizes that MN1 has moved at this point, and requests LSR7 to delete the LSP (LSR7-LSR9) before moving. In addition, in HA2 and CN3, "Secondary
The CoA of MN1 stored as “y CoA” is “P
It is re-stored as "primary CoA" and a new CoA is used for subsequent communication.

Finally, when the AR6 which has captured the BU transmitted to the CN recognizes that the MN1 has moved by analyzing the BU, it sends the LSP 9 the LSP before the movement.
Request deletion of (LSR9-LSR7).

As described above, in the present embodiment,
By this procedure, the shortest LSP (LSR8-LSR9) that predicts the destination before the MN1 moves, guarantees the registration procedure at the destination and the QoS required for communication after the movement
The configuration is set in advance. As a result, packet loss can be significantly reduced as compared with the case where a new LSP is set after moving. In addition, for example, the C used at the destination for the CN3 by using the existing LSP
By notifying the oA, that is, not using the BU for notifying the CoA, it is possible to significantly speed up the setting of the LSP for label switching the packet from the CN3 to the MN1.

Embodiment 10. FIG. FIG. 19 is an LSP of the tenth embodiment in the mobile communication system according to the present invention.
It is a figure which shows the setting method. Since the configuration of the mobile communication system is the same as that of the above-described ninth embodiment, the same reference numerals are given and the description thereof is omitted.

Now, the LSP setting method shown in FIG. 19 will be described. In the present embodiment, a procedure different in operation from the above-described ninth embodiment will be described.
The MN 1 that has predicted the movement destination before moving moves to AR 4 a router request including an AP (access point) identifier for identifying the movement destination domain. Upon receiving the router request including the AP identifier from the MN1, the AR4 receives the QoS of the MN1 stored in advance in the router request.
The router request after adding the information and adding the QoS information
1 transfers to the domain (AR5) predicted as the destination. Then, in the AR5 that received the router request,
It stores the QoS information of MN1 and sends a router advertisement to MN1 (see FIGS. 17 and 19).

At the same time as the BU transmission of the procedure, the MN1
Then, BU is transmitted to AR5 (FIG. 17 and FIG. 1).
9). Here, the LSP that specifies the IP address of CN3 that is in communication and guarantees QoS with CN3
Tell that you need to set up.

As described above, in this embodiment, the same effect as that of the above-described ninth embodiment can be obtained, and further, the QoS information is added to the router request to be transmitted to the movement destination predicted by MN1. Therefore, it becomes possible to advertise a router capable of guaranteeing QoS to MN1.

Eleventh Embodiment 22 and 23 show
It is a figure which shows the LSP setting method of Embodiment 11 in the mobile communication system concerning this invention. The configuration of the mobile communication system is the same as that of the first embodiment described above.
Therefore, the same reference numerals are given and the description thereof will be omitted.

In this embodiment, the MN1 predicts the destination (domain including AR5) before moving, and the LSP (QoS) required for registration at the destination and QoS required for communication after movement ( Seamless communication is realized by setting the LSR8-LSR9) in advance. Also, existing L
LS is notified by using SP (LSR7-LSR9) to notify CN3 of the CoA used at the destination.
Speed up the execution of CR-LDP from R9 to LSR8. Further, by inquiring the HA2 about the QoS guaranteed for the MN1 every time the MN1 moves, the unauthorized occupation of the band is prevented.

The LSP setting method shown in FIGS. 22 and 23 will be described below. The MN 1 that has predicted the movement destination before moving moves to AR 4 a router request including an AP (access point) identifier for identifying the movement destination domain. Upon receipt of the router request containing the AP identifier from MN1, AR4 transfers the router request to the domain (AR5) predicted by MN1 as the destination. When AR5 receives the router request, M
A router advertisement is sent to N1 (FIGS. 22 and 23).
reference).

Next, the MN1 which has acquired the new CoA by the above procedure transmits BU to the CN3 and HA2 to notify the CoA (see FIGS. 22 and 23). At this point, MN1 has not moved yet, so that the node receiving the BU does not start communication using the new CoA.
The CoA is transmitted using the "Alternative CoA" option of "IPv6". CN that received BU
3 and HA2, "AlternativeCoA"
The CoA notified by the option "Secondary
CoA ”is stored.

Further, at the same time as the above procedure, MN1 transmits BU to AR5 (FIGS. 22 and 23).
reference). Here, the IP address of CN3 that is in communication is specified, and it is communicated that it is necessary to set an LSP that guarantees QoS with CN3. AR5 that received BU
Then, the IP address of CN3 is stored.

Next, in the AR6 which receives the CoA of the MN1 in the above procedure, the CR- from the LSR9 to the LSR8 is received.
The LDP execution request is transmitted to the LSR 9 (see FIGS. 22 and 23). In addition, Q from CN3 to MA1 direction
AR6 manages the oS information.

Next, the LSR 9 which has received the CR-LDP execution request executes the CR-LDP, and the CN 3 makes the MN 1
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR9 and LSR
8 and 8 (corresponding to the label request and label mapping in FIGS. 22 and 23).

Next, the BU from MN1 is subjected to the above procedure.
AR5 which has received the message identifies the home network to which MN1 belongs from the home address of MN1 included in the BU. And for that home network,
The MN 1 inquires about guaranteed QoS information (see FIGS. 22 and 23). HA2 on the home network responds to the inquiry about the QoS information with M
The AR 5 is notified of the QoS information guaranteed in N1 (see FIGS. 22 and 23).

Next, according to the above procedure, BU (CN3 I
AR5 which has received the P address (including P address) and learned the QoS information of MN1 in the procedure, LSR8 to LSR
CR to LSR8 to set LSP to 9
-Send an LDP execution request (see FIGS. 22 and 23).

Next, the LSR8 that has received the CR-LDP execution request executes CR-LDP, and the MN1 sends CN3.
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR8 and LSR
9 and 9 (corresponding to the label request and label mapping in FIGS. 22 and 23).

After moving to the predicted destination, MN1 goes to H
"Alternative" addressed to A2, CN3, and AR4
An ordinary BU that does not use the "e CoA" option is transmitted (see FIG. 23). The CoA included in this BU is
This is the address that was previously used as "Alternative CoA". The IP address of AR4 is MN1.
It can be obtained from the BU transmission list of “Mobile IPv6” managed by itself.

Upon receipt of BU, AR4 recognizes that MN1 has moved at this point and requests LSR7 to delete the LSP (LSR7-LSR9) before moving. In addition, in HA2 and CN3, "Secondary
The CoA of MN1 stored as “y CoA” is “P
It is re-stored as "primary CoA" and a new CoA is used for subsequent communication.

Finally, the AR6 which has captured the BU transmitted to the CN analyzes the BU and recognizes that the MN1 has moved, and then recognizes that the MN1 has moved to the LSR9.
Request deletion of (LSR9-LSR7).

As described above, in the present embodiment,
By this procedure, the shortest LPS (LSR8-LSR9) that predicts the destination before the MN1 moves, and guarantees the registration procedure at the destination and the QoS required for communication after the movement
And the setting are performed in advance. This allows
Packet loss can be significantly reduced compared to the case where a new LSP is set after moving. Also, MN1
By inquiring the HA2 about the guaranteed QoS information at every movement, it is possible to prevent the MN1 from tampering with the QoS information and prevent a third party from impersonating the MN1 to illegally occupy the band.

Twelfth Embodiment 24 and 25 show
It is a figure which shows the LSP setting method of Embodiment 12 in the mobile communication system concerning this invention. The configuration of the mobile communication system is the same as that of the first embodiment described above.
Therefore, the same reference numerals are given and the description thereof will be omitted.

In this embodiment, the MN1 predicts the destination (domain including AR5) before moving, and the LSP (QoS) required for the registration at the destination and the QoS required for communication after the movement ( Seamless communication is realized by setting the LSR8-LSR9) in advance. Also, existing L
LS is notified by using SP (LSR7-LSR9) to notify CN3 of the CoA used at the destination.
Speed up the execution of CR-LDP from R9 to LSR8. Also, at the source AR4, the BU transmitted by MN1
When the CoA belonging to another domain is included in the destination address, the destination AR5 managing the CoA is notified of the IP addresses of the CN3 and HA2. As a result, MN1 does not need to support the extended procedure from the existing protocol,
The processing load can be reduced.

The LSP setting method shown in FIGS. 24 and 25 will be described below. The MN 1 that has predicted the movement destination before moving moves to AR 4 a router request including an AP (access point) identifier for identifying the movement destination domain. Upon receipt of the router request containing the AP identifier from MN1, AR4 transfers the router request to the domain (AR5) predicted by MN1 as the destination. When AR5 receives the router request, M
A router advertisement is sent to N1 (see FIGS. 24 and 25).
reference).

Next, the MN1 which has acquired the new CoA by the above procedure transmits BU to the CN3 and HA2 to notify the CoA (see FIGS. 24 and 25). At this point, MN1 has not moved yet, so that the node receiving the BU does not start communication using the new CoA.
The CoA is transmitted using the "Alternative CoA" option of "IPv6". CN that received BU
3 and HA2, "AlternativeCoA"
The CoA notified by the option "Secondary
CoA ”is stored.

Next, in the AR6 which received the CoA of the MN1 in the above procedure, the CR- from the LSR9 to the LSR8 is received.
The LDP execution request is transmitted to the LSR 9 (see FIGS. 24 and 25). In addition, Q from CN3 to MA1 direction
AR6 manages the oS information.

Next, the LSR 9 which has received the CR-LDP execution request executes the CR-LDP, and the CN 3 makes the MN 1
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR9 and LSR
8 and 8 (corresponding to the label request and label mapping in FIGS. 24 and 25).

Then, in AR4, the MN
1 BU captures the BU, identifies that the CoA included in the BU is an address of another domain, and identifies that MN1 and CN3 are communicating from the packet that MN1 sends to CN3. The home address of MN1 and the IP address of CN3 are notified to AR5 corresponding to the CoA (see FIGS. 24 and 25).

Next, in AR5 which has received the home address of MN1 and the IP address of CN3 in the above procedure,
The home network to which MN1 belongs is identified from the home address of MN1. Then, the home network is queried for QoS information guaranteed in MN1 (see FIGS. 24 and 25). In response to the inquiry about the QoS information, HA2 on the home network notifies AR5 of the QoS information guaranteed in MN1 (see FIGS. 24 and 25).

Next, in the AR5 which has received the IP address of the CN3 in the above procedure and learned the QoS information of the MN1 in the procedure, in order to set the LSP from the LSR8 to the LSR9, the CR- The LDP execution request is transmitted (see FIGS. 24 and 25).

Next, the LSR 8 which has received the CR-LDP execution request executes CR-LDP, and the MN 1 makes the CN 3
LSP for switching the data to be sent to
(Shortest LSP that guarantees QoS), LSR8 and LSR
9 and 9 (corresponding to the label request and label mapping in FIGS. 24 and 25).

After moving to the predicted destination, MN1 sends H
"Alternative Co addressed to A2 and CN3
Send a normal BU without the "A" option (see Figure 25). The CoA contained in this BU was previously "A"
This is the address used as the "alternate CoA". And in HA2 and CN3, "Second
The CoA of MN1 stored as "ary CoA" is stored again as "Primary CoA", and the new CoA is used for subsequent communication.

Finally, when the AR6 which has captured the BU transmitted to the CN recognizes that the MN1 has moved by analyzing the BU, the AR6 before moving to the LSR9 is detected.
Request deletion of (LSR9-LSR7). And L
When the SP deletion request reaches the LSR7, the LSR7
Considering that MN1 has moved, the existing LSP (LSR)
7-LSR 9) is deleted.

As described above, in the present embodiment,
By this procedure, the shortest LPS (LSR8-LSR9) that predicts the destination before the MN1 moves, and guarantees the registration procedure at the destination and the QoS required for communication after the movement
And the setting are performed in advance. This allows
Packet loss can be significantly reduced compared to the case where a new LSP is set after moving. Further, since the process of setting the path at the destination (the path with guaranteed QoS) is executed on the network side, the extension to MN1 is
Only support for "Alternative CoA" option.

Thirteenth Embodiment 26 and 27 show
It is a figure which shows the LSP setting method of Embodiment 13 in the mobile communication system concerning this invention. The configuration of the mobile communication system is the same as that of the first embodiment described above.
Therefore, the same reference numerals are given and the description thereof will be omitted. Here, only the operation different from that of the above-described twelfth embodiment will be described.

In the present embodiment, the AR4 captures the BU transmitted by the MN1 in the procedure, and the CoA included in the BU is acquired.
Is an address of another domain, and MN1 sends CN3
When it is identified from the packet transmitted to the destination that MN1 and CN3 are in communication, the IP address of CN3 and the QoS information in the direction from MN1 to CN3 are notified to AR5 corresponding to the CoA included in BU (Fig. 26 and FIG. 27).

As described above, in the present embodiment, the source AR 4 notifies the destination AR 5 of the QoS information in the direction from MN 1 to CN 3. This makes H
Since the inquiry about the QoS information to A2 can be omitted, L
The time required for SP setting and the transfer overhead of control information can be reduced.

Fourteenth Embodiment 28 and 29 show
It is a figure which shows the LSP setting method of Embodiment 14 in the mobile communication system concerning this invention. The configuration of the mobile communication system is the same as that of the first embodiment described above.
Therefore, the same reference numerals are given and the description thereof will be omitted. Here, only the operation different from the above-described twelfth and thirteenth embodiments will be described.

In the present embodiment, AR4 is H and MN1 is H.
It is confirmed whether the response (see FIG. 28-a2) to the BU (see FIG. 28-a1) transmitted to A2 is normal.
As a result, in the normal case, in AR4, C included in BU
OA is an address of another domain, and MN1
When it is identified from the packet transmitted to N3 that MN1 and CN3 are communicating, the IP address of CN3 and MN1 are addressed to AR5 corresponding to the CoA included in BU.
To CN3 direction QoS information (see FIGS. 28 and 29). On the other hand, when the response is an abnormal response (BU cannot be accepted), the AR 5 of the moving destination is not notified.

As described above, in the present embodiment, M
After the BU from N1 to HA2 is normally accepted,
The source AR4 is supposed to notify the destination AR5 of the QoS information in the direction from MN1 to CN3. As a result, it is possible to prevent the allocation of invalid network resources by an unauthorized BU such as when a third party impersonates the MN1.

[0156]

As described above, according to the present invention, when the MN moves to another sub-network, L
SP recalculation request processing, QoS transfer processing, CR-LD
A new LSP is set by performing the P execution request process, the shortest LSP setting process, and the LSP recalculation response process. As a result, there is an effect that it is possible to obtain a mobile communication system in which the shortest LSP can be set with the communication partner CN. Furthermore, HA to M
By obtaining N QoS information, it is possible to obtain a mobile communication system capable of setting the shortest LSP with guaranteed QoS.

According to the next invention, the QoS transfer processing, the CR-LDP execution request processing, the shortest LSP setting processing,
By performing LSP recalculation response processing,
The SP is set. As a result, the MN becomes the LSP
It is possible to obtain a mobile communication system capable of setting the shortest LSP that guarantees QoS with a CN as a communication partner by the network judgment without sending a recalculation request. .

According to the next invention, LSP recalculation request processing, CR-LDP execution request processing, shortest LSP setting processing,
By performing LSP recalculation response processing,
The SP is configured to be set, and the destination AR is the MN.
The QoS information of the above can be temporarily stored. As a result, it is possible to obtain a mobile communication system capable of setting the shortest LSP with guaranteed QoS without inquiring the HA about the QoS information of the MN.

According to the next invention, CR-LDP execution request processing, shortest LSP setting processing, LSP recalculation response processing,
By doing so, a new LSP is set, and further, the AR of the moving destination is configured to be able to temporarily store the QoS information of the MN. As a result, the MN does not send the LSP recalculation request, and the MN's Q
It is possible to obtain a mobile communication system capable of setting the shortest LSP with guaranteed QoS without inquiring about the QoS information.

According to the next invention, router request / advertisement processing, BU transmission / QoS information passing processing, bidirectional LS
A new LSP is set by performing the P setting process. As a result, triggered by the BU issued at the destination, the shortest LS that guarantees QoS with the communication partner.
The mobile communication system capable of setting P can be obtained.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing the P setting process. As a result, triggered by the BU issued at the destination, the shortest LS that guarantees QoS with the communication partner.
The mobile communication system capable of setting P can be obtained.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing the P setting process, and further, the QoS information of the MN is acquired from any one node device that is managed or temporarily stored. As a result, B issued at the destination
The effect of U is that it is possible to obtain the mobile communication system capable of setting the shortest LSP with guaranteed QoS with the communication partner.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing the P setting process, and the QoS information of the MN is set to the neighboring A
The configuration is obtained from R. As a result, it is possible to obtain a mobile communication system capable of setting the shortest LSP with guaranteed QoS with the communication partner, triggered by the BU issued at the destination.

According to the next invention, the destination is predicted before the MN moves, and the registration procedure at the destination and the setting of the shortest LSP that guarantees the QoS required for communication after the movement are performed.
The configuration is performed in advance. As a result, it is possible to obtain a mobile communication system capable of significantly reducing packet loss as compared with the case where a new LSP is set after moving. Also, for example, by using the existing LSP to notify the CN of the CoA used at the destination, that is, by not using BU for notification of the CoA, the LSP for label switching the packet from the CN to the MN It is possible to obtain a mobile communication system capable of significantly speeding up the setting of.

According to the next invention, since the MN is configured to add the QoS information to the router request to be transmitted to the destination, the router that can guarantee the QoS is advertised to the MN. The mobile communication system can be obtained.

According to the next invention, when the MN moves to another sub-network, LSP recalculation request processing, Q
oS transfer processing, CR-LDP execution request processing, shortest L
A new LSP is set by performing the SP setting process and the LSP recalculation response process. As a result, there is an effect that the shortest LSP can be set with the communication partner CN. Furthermore, by obtaining the QoS information of the MN from the HA, it is possible to set the shortest LSP that guarantees the QoS.

According to the next invention, the QoS transfer processing, the CR-LDP execution request processing, the shortest LSP setting processing,
By performing LSP recalculation response processing,
Set SP. As a result, the shortest LSP that guarantees QoS between the MN and the CN that is the communication partner based on the network judgment without the MN sending the LSP recalculation request.
There is an effect that can be set.

According to the next invention, LSP recalculation request processing, CR-LDP execution request processing, shortest LSP setting processing,
By performing LSP recalculation response processing,
Set SP. Furthermore, the destination AR is the MN's QoS
Store information temporarily. As a result, the MN's Q
It is possible to set the shortest LSP that guarantees QoS without inquiring about the QoS information.

According to the next invention, CR-LDP execution request processing, shortest LSP setting processing, LSP recalculation response processing,
To set a new LSP. Furthermore, the destination AR temporarily stores the MN's QoS information. As a result, the MN can set the shortest LSP with guaranteed QoS without sending the LSP recalculation request and without inquiring the HA about the MN's QoS information.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing P setting processing. As a result, there is an effect that the shortest LSP with guaranteed QoS can be set with the communication partner triggered by the BU issued at the moving destination.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing P setting processing. As a result, there is an effect that the shortest LSP with guaranteed QoS can be set with the communication partner triggered by the BU issued at the moving destination.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing P setting processing. Furthermore, the QoS information of the MN is acquired from any one of the node devices that is managed or temporarily stored. As a result, there is an effect that the shortest LSP with guaranteed QoS can be set with the communication partner triggered by the BU issued at the moving destination.

According to the next invention, router request / advertisement processing, BU transmission / QoS information transfer processing, bidirectional LS
A new LSP is set by performing P setting processing. Furthermore, the QoS information of the MN is acquired from the adjacent AR. With this, triggered by the BU issued at the destination,
The effect is that the shortest LSP that guarantees QoS can be set with the communication partner.

According to the next invention, the destination is predicted before the MN moves, and the registration procedure at the destination and the setting of the shortest LSP with guaranteed QoS required for communication after the movement are performed.
Go ahead. As a result, it is possible to significantly reduce packet loss as compared with the case where a new LSP is set after moving. In addition, for example, Co that is used at the destination at the CN using the existing LSP
By notifying A, that is, not using BU for notifying CoA, it is possible to significantly speed up the setting of the LSP for label switching the packet from the CN to the MN.

According to the next invention, further, the QoS information is added to the router request to be transmitted to the movement destination predicted by the MN. As a result, it is possible to advertise a router capable of guaranteeing QoS to the MN.

According to the next invention, the destination is predicted before the MN moves, the registration procedure at the destination and the setting of the shortest LPS that guarantees the QoS required for communication after the movement,
The configuration is performed in advance. As a result, it is possible to obtain a mobile communication system capable of significantly reducing packet loss as compared with the case where a new LSP is set after moving. Further, the MN inquires about the guaranteed QoS information for each movement. As a result, it is possible to obtain a mobile communication system capable of preventing the MN from tampering with the QoS information and illicitly occupying the band due to a third party impersonating the MN.

According to the next invention, the path setting process at the destination is further executed on the network side. As a result, the extension for the MN is "Alterna".
It is possible to obtain a mobile communication system that only supports the "Tive CoA" option.

According to the next invention, the source A
QoS from R to destination AR in MN to CN direction
It is configured to notify information. With this, Qo to HA
Since the inquiry about the S information can be omitted, it is possible to obtain a mobile communication system capable of reducing the time required for the LSP setting and reducing the transfer overhead of the control information.

According to the next invention, further, MN to H
After the BU to A is normally accepted, the AR of the movement source
However, the MN is configured to notify the destination AR of the QoS information in the direction of the CN. As a result, it is possible to obtain a mobile communication system capable of preventing the assignment of invalid network resources due to an unauthorized BU when a third party impersonates the MN.

According to the next invention, the destination is predicted before the MN moves, the registration procedure at the destination and the setting of the shortest LPS that guarantees the QoS required for communication after the movement,
Was decided in advance. As a result, it is possible to significantly reduce packet loss as compared with the case where a new LSP is set after moving. In addition, the QoS information guaranteed in the MN is sent to the HA for each movement.
I decided to contact. As a result, it is possible to prevent the MN from tampering with the QoS information and illicit bandwidth occupation by a third party impersonating the MN.
Has the effect.

According to the next invention, the path setting process at the destination is further executed on the network side. As a result, in the MN, "Alternative
This has the effect of eliminating the need to support options other than the CoA "option.

According to the next invention, the source A
QoS from R to destination AR in MN to CN direction
It was decided to notify the information. With this, Qo to HA
Since it is possible to omit the inquiry about the S information, it is possible to reduce the time required for the LSP setting and the control information transfer overhead.

According to the next invention, further, MN to H
After the BU to A is normally accepted, the AR of the movement source
However, it has decided to notify the destination AR of the QoS information in the direction from the MN to the CN. As a result, it is possible to prevent the allocation of invalid network resources due to an unauthorized BU such as when a third party impersonates the MN.

[Brief description of drawings]

FIG. 1 is a configuration of a mobile communication system according to the present invention and a label switching path (LSP) according to a first embodiment.
It is a figure which shows the setting method.

FIG. 2 is a diagram showing an LSP setting method according to the first embodiment.

FIG. 3 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a second embodiment.

FIG. 4 is a diagram showing an LSP setting method according to the second embodiment.

FIG. 5 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a third embodiment.

FIG. 6 is a diagram showing an LSP setting method according to the third embodiment.

FIG. 7 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a fourth embodiment.

FIG. 8 is a diagram showing an LSP setting method according to the fourth embodiment.

FIG. 9 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a fifth embodiment.

FIG. 10 is a diagram showing an LSP setting method according to the fifth embodiment.

FIG. 11 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a sixth embodiment.

FIG. 12 is a diagram showing an LSP setting method according to the sixth embodiment.

FIG. 13 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a seventh embodiment.

FIG. 14 is a diagram showing an LSP setting method according to the seventh embodiment.

FIG. 15 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to an eighth embodiment.

FIG. 16 is a diagram showing an LSP setting method according to the eighth embodiment.

FIG. 17 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a ninth embodiment.

FIG. 18 is a diagram showing an LSP setting method according to the ninth embodiment.

FIG. 19 is a diagram showing an LSP setting method according to the tenth embodiment.

FIG. 20 is a diagram showing a conventional LSP setting method.

FIG. 21 is a diagram showing a conventional LSP setting method.

FIG. 22 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to an eleventh embodiment.

FIG. 23 is a diagram showing an LSP setting method according to the eleventh embodiment.

FIG. 24 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to the twelfth embodiment.

FIG. 25 is a diagram showing an LSP setting method according to the twelfth embodiment.

FIG. 26 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a thirteenth embodiment.

FIG. 27 is a diagram showing an LSP setting method according to the thirteenth embodiment.

FIG. 28 is a diagram showing a configuration of a mobile communication system according to the present invention and an LSP setting method according to a fourteenth embodiment.

FIG. 29 is a diagram showing an LSP setting method according to the fourteenth embodiment.

[Explanation of symbols]

1 MN (Mobile Node), 2 HA (Home Agent),
3 CN (Correspondent Node), 4, 5, 6 access router (AR), 7, 8, 9, 10 LSR (label switching router).

Claims (28)

[Claims] 1. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
A first node device that requests recalculation of the label switching path after the existing label switching path is extended to the destination when the home network moves from the first subnetwork to the outside subnetwork; A destination QoS router for inquiring the first sub-network for QoS (Quality of Services) information of the first node device, and a desired QoS from the third node device accommodated in the first sub-network. The destination label switching router that sets a new label switching path that guarantees QoS with the label switching router accommodated in the second subnetwork according to an instruction from the destination access router that has received the information. And a mobile communication system comprising: 2. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In a body communication system, a first node device accommodated in a first sub-network is communicating with a second node device accommodated in a second sub-network using an existing label switching path, Q of the first node device addressed to the first sub-network when moving to another sub-network of
At the instruction of the destination access router that inquires about the QoS information and the destination access router that receives the desired QoS information from the third node device accommodated in the first sub-network, the second sub A mobile communication system, comprising: a destination label switching router that sets a new label switching path that guarantees QoS between the label switching router accommodated in the network. 3. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
When moving to an external subnetwork, the first node device requesting recalculation of the label switching path after the existing label switching path is extended to the destination, and the QoS information of the first node device, According to the stored instruction of the access router of the moving destination, Q is generated between the label switching router accommodated in the second subnetwork.
A mobile communication system comprising: a destination label switching router that sets a new label switching path that guarantees oS. 4. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In a body communication system, a first node device accommodated in a first sub-network is communicating with a second node device accommodated in a second sub-network using an existing label switching path, Access to the destination that stores the QoS information of the first node device, which requests recalculation of the label switching path after the existing label switching path is extended to the destination when moving to the subnetwork QoS is provided between the router and the label switching router accommodated in the second sub-network. Mobile communication system, comprising setting a new label switched path testimony, the destination label switching router, a. 5. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
When moving to an external sub-network, the first message for associating a CoA (Care of Address) and a home address in the external network,
Add an option to inquire about QoS information,
The second message after the option addition is transmitted to the third node device accommodated in the first sub-network which is the home network, and further, after receiving the desired QoS information from the third node device, A first node device for transmitting a third message for associating a CoA and a home address to the second node device, wherein the label switching router of the movement destination is instructed by the first node device. , A first label switching path for switching data to be transmitted from the first node device to the second node device, between the label switching router accommodated in the second sub-network Then, the label switching router accommodated in the second subnetwork accommodates the second node device. A second label switching path for switching data to be transmitted from the second node device to the first node device to the destination label switching router according to an instruction from the access router. A mobile communication system. 6. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
To associate the CoA and the home address in the external network to the third node device and the second node device accommodated in the first subnetwork which is a home network when moving to the external subnetwork Send the first message of the first
Of the third node device by comparing the home address of the first node device with the destination address of the first message.
A destination access router for recognizing the IP address of the node device, and inquiring the third node device for the QoS information of the first node device; At the instruction of the destination access router that has received the desired QoS information from the third node device, the first node device is connected to the label switching router accommodated in the second sub-network, A second label switching router, which sets a first label switching path for switching data to be transmitted to the second node device, and which is accommodated in the second sub-network, accommodates the second node device. In response to the instruction, the second node device is connected to the label switching router of the movement destination by the first node. Mobile communication system, characterized by setting the second label switched path for switching data to be transmitted to the de device addressed. 7. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
When moving to an external subnetwork, an option for inquiring about QoS information is added to the first message for associating the CoA and the home address in the external network, and the first subnetwork that is the home network is added. A third node device accommodated therein, an access router accommodating the third node device, and a first node device transmitting the second message after the option addition to the second node device. A destination label switching router manages the QoS information of the first node device among the third node device, the access router accommodating the third node device, and the second node device, or Q transmitted by the temporarily stored node device to the first node device
At the instruction of the access router at the destination to receive the oS information,
A first label switching path for switching the data transmitted from the first node device to the second node device is set between the label switching router accommodated in the second sub-network and the label switching router. The label switching router accommodated in the second sub-network, at the instruction of the access router accommodating the second node device, and the label switching router of the destination, the second node device, A mobile communication system, characterized in that a second label switching path for switching data to be transmitted to the first node device is set. 8. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
To associate the CoA and the home address in the external network to the third node device and the second node device accommodated in the first subnetwork which is a home network when moving to the external subnetwork A first node device for transmitting the first message of No. 1 and further notifying the address of the node device managing the own QoS information to the access router of the movement destination, the access router of the movement destination Asks the node device corresponding to the notified address for the QoS information of the first node device, and the destination label switching router instructs the destination access router which has received the desired QoS information. And between the label switching router accommodated in the second sub-network, Said first node apparatus and a second
A label switching router for setting the first label switching path for switching data to be transmitted to the node device, and the label switching router accommodated in the second sub-network is the access router for accommodating the second node device. According to an instruction, a second label switching path for switching data to be transmitted from the second node device to the first node device is set between the destination label switching router and the destination label switching router. Mobile communication system. 9. A mobile device comprising a plurality of sub-networks including a node device, a label switching router, and an access router accommodating the node device, and performing communication using a label switching path set between the node devices. In the body communication system, during communication using the existing label switching path with the second node device accommodated in the second sub-network,
When the movement to the external sub-network is predicted, the CoA in the external network is acquired from the access router of the predicted movement destination, and the CoA is notified to the second node device using the existing label switching path. Further, a first message for associating the CoA and the home address, which are optionally notified, is transmitted to the third node device accommodated in the first sub-network, which is the home network, and the first message is transmitted. A first node device, which transmits a second message specifying the IP address of the second node device to an access router accommodated in the first sub-network, and is accommodated in the first sub-network The access router that has received the second message, in the received second message, the QoS of the first node device. Information is added, and the third message after the QoS information is added is transmitted to the predicted access destination access router, and the label switching router accommodated in the second sub-network is Upon receiving an instruction from the access router that accommodates the second node device that has received the CoA, the data to be transmitted from the second node device to the first node device is transmitted to and from the label switching router that is the predicted movement destination. A first provisional label switching path for switching is set, and the label switching router of the predicted movement destination is a QoS switch.
At the instruction of the access router at the predicted movement destination, which has received the third message after the addition of the information, the first node device is connected to the label switching router accommodated in the second sub-network, A second provisional label switching path for switching data to be transmitted to the node device, and after moving to the predicted movement destination, the first node device causes the third node device and the second node device to A mobile communication system characterized by transmitting a fourth message to a node device and an access router accommodated in the first sub-network, and switching an existing label switching path to the temporary label switching path at this point. . 10. A node device, a label switching router, and an access router accommodating the node device,
In a mobile communication system configured by a plurality of sub-networks including a node switching device and performing communication using a label switching path set between the node devices, the second node device accommodated in the second sub-network and the existing label switching While communicating using the path,
When the movement to the external sub-network is predicted, the CoA in the external network is acquired from the access router of the predicted movement destination, and the CoA is notified to the second node device using the existing label switching path. Further, a first message for associating the CoA and the home address, which are optionally notified, is transmitted to the third node device accommodated in the first sub-network, which is the home network, and the prediction is performed. A first node device, which transmits a second message that clearly indicates the IP address of the second node device, to the destination access router, wherein the access router accommodated in the first sub-network is , At the same time that the first node device acquires CoA from the access router of the predicted movement destination, Note that the QoS information of the first node device is notified to the access router of the predicted movement destination, and the label switching router accommodated in the second subnetwork receives the CoA of the first node device. In response to an instruction from the access router accommodating the second node device, a first switching device for switching data to be transmitted from the second node device to the first node device with the label switching router of the predicted movement destination. A temporary label switching path is set, and the label switching router of the predicted movement destination receives the second message clearly indicating the IP address of the second node device, at the instruction of the access router of the predicted movement destination, Between the label switching router accommodated in the second sub-network, the first node device is connected to the second node device. After setting the second temporary label switching path for switching the data to be transmitted to the node device, and after moving to the predicted destination, the first node device sets the third node device and the second node device. Node device and the first
A mobile communication system, wherein a third message is transmitted to an access router accommodated in the sub-network, and the existing label switching path is switched to the temporary label switching path at this point. 11. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external subnetwork, after extending the existing label switching path to the destination of the first node device, the first node device requests the access router of the destination to recalculate the label switching path. The recalculation request step and the destination access router requested to recalculate inquires about the QoS information of the first node device addressed to the home network of the first node device, and the third node device on the home network , QoS for notifying desired QoS information
According to the S information acquisition step and the instruction of the destination access router that has received the desired QoS information, the label switching router connected to the access router establishes QoS between the label switching router on the second node device side. A label switching path setting step for setting a guaranteed new label switching path, and a label switching path setting method comprising: 12. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external sub-network, the destination access router inquires the home network of the first node device for the QoS information of the first node device, and the third node device on the home network sends the desired information. A QoS information acquisition step of notifying QoS information, and a label switching router connected to the access router according to an instruction of a destination access router that has received the desired QoS information, and a label switching router on the second node device side. Label to set a new label switching path with guaranteed QoS during Label switched path setting method, which comprises a Itchingupasu setting step. 13. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external subnetwork, after extending the existing label switching path to the destination of the first node device, the first node device requests the access router of the destination to recalculate the label switching path. According to the recalculation request step and the instruction of the destination access router that stores the QoS information of the first node device, the label switching router connected to the access router becomes the label switching router on the second node device side. Label switching that establishes a new label switching path that guarantees QoS between Label switched path setting method, which comprises scan setting step and a. 14. A node device, a label switching router, and an access router for accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external sub-network, after extending the existing label switching path to the destination of the first node device, the destination access router that stores the QoS information of the first node device becomes the access router. The recalculation request step of requesting the recalculation of the label switching path to the connected label switching router and the label switching router requested to recalculate the second
Between the label switching router on the node device side of
A label switching path setting step of setting a new label switching path with a guaranteed oS, and a label switching path setting method comprising: 15. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external sub-network, the first node device is
A first message in which an option for inquiring about QoS information is added to a first message for associating an oA with a home address, and a second message after the addition of the option is sent to a third node device on the home network. And a third node device receiving the second message,
A QoS information transmitting step of transmitting the QoS information to the first node device, and a second message in which the first node device transmits a third message for associating the CoA and the home address to the second node device. Between the label switching router on the second node device side and the label switching router connected to the destination access router according to the instruction of the first node device which has received the desired QoS information. A first label switching path setting step for setting a first label switching path for switching data transmitted from the first node device to the second node device; and an access router accommodating the second node device Instructions,
A second label switching router connected to the access router for switching data to be transmitted from the second node device to the first node device between the label switching router on the first node device side and the second node switching device. And a second label switching path setting step for setting the label switching path. 16. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external sub-network, the first node device addresses the first node device for associating the CoA and the home address in the external network to the third node device and the second node device on the home network. The transmitting step of transmitting the message, and the destination access router accommodating the first node device compare the home address of the first node device and the destination address of the first message to the third node device. Of the first node device to the third node device by recognizing the IP address of Query, the third node device having received the query, the desired Qo
The QoS information acquisition step of notifying the S information, and the label switching router connected to the access router at the instruction of the destination access router that has received the desired QoS information, becomes the label switching router on the second node device side. A first label switching path setting step for setting a first label switching path for switching data transmitted from the first node apparatus to the second node apparatus during At the instruction of the access router to accommodate,
A second label switching router connected to the access router for switching data to be transmitted from the second node device to the first node device between the label switching router on the first node device side and the second node switching device. And a second label switching path setting step for setting the label switching path. 17. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external sub-network, the first node device is
An option for inquiring about QoS information is added to the first message for associating the oA with the home address, and the third node device on the home network,
An access router accommodating the third node device, and a transmitting step of transmitting a second message after the option is added to the second node device; a third node device receiving the second message; Among the access router that accommodates the third node device and the second node device, the node device that manages or temporarily stores the QoS information of the first node device is the first node that stores the QoS information. QoS sent to the device
The information transmitting step and the label switching router connected to the access router according to the instruction of the destination access router that has received the desired QoS information are connected to the first node between the label switching router on the second node device side. Label switching path setting step for setting a first label switching path for switching data transmitted from the second node apparatus to the second node apparatus, and an instruction of an access router accommodating the second node apparatus so,
A second label switching router connected to the access router for switching data to be transmitted from the second node device to the first node device between the label switching router on the first node device side and the second node switching device. And a second label switching path setting step for setting the label switching path. 18. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When moving to an external sub-network, the first node device addresses the first node device for associating the CoA and the home address in the external network to the third node device and the second node device on the home network. The transmitting step of transmitting the message, and the first node device notifies the address of the node device that manages its own QoS information to the access router of the destination, and the destination node that accommodates the first node device The access router queries the notified node device for the QoS information of the first node device, The node device that has received the match, the QoS information acquisition step of notifying the desired QoS information, and the label switching router connected to the access router according to the instruction of the destination access router that has received the desired QoS information, A first label switching for setting a first label switching path for switching data to be transmitted from the first node device to the second node device, with the label switching router on the second node device side. At the path setting step and the instruction of the access router accommodating the second node device,
A second label switching router connected to the access router for switching data to be transmitted from the second node device to the first node device between the label switching router on the first node device side and the second node switching device. And a second label switching path setting step for setting the label switching path. 19. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When the movement to the external subnetwork is predicted, the first node device acquires the CoA in the external network from the predicted movement destination access router CoA
Acquisition step, and the first node device that has acquired the CoA sends the C to the second node device using the existing label switching path.
a CoA notification step of notifying the oA, and a first node device sending a first message for associating the CoA and the home address, which are optionally notified, to the third node device on the home network. And a second message in which the first node device specifies the IP address of the second node device to the access router on the home network, and the access router on the home network further A second transmission step of adding the QoS information of the first node device to the received second message and transmitting the third message after the addition of the QoS information to the access router of the predicted movement destination; In response to the instruction from the access router that accommodates the second node device that has received the CoA of the node device of The continued label switching router sets a first provisional label switching path for switching the data transmitted from the second node device to the first node device, with the label switching router of the predicted movement destination. The label switching router connected to the first label switching path is set to the second node device according to the instruction of the predicted access destination access router that has received the third message after adding the QoS information. A second label switching path setting step for setting a second provisional label switching path for switching data transmitted from the first node apparatus to the second node apparatus, between the label switching router on the side; , After the movement to the predicted movement destination, the first node device is connected to the third node device and the second node device. A third transmission step of transmitting a fourth message to the node device and the access router on the home network, and switching the existing label switching path to the temporary label switching path at this point; Switching path setting method. 20. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When the movement to the external sub-network is predicted, the first node device acquires the CoA in the foreign network from the access router of the predicted movement destination, and at the same time, the access router on the home network makes the QoS of the first node device. The CoA acquisition step of notifying the information to the access router of the predicted movement destination, and the first node device that has acquired the CoA sends the C to the second node device using the existing label switching path.
a CoA notification step of notifying the oA, and a first node device sending a first message for associating the CoA and the home address, which are optionally notified, to the third node device on the home network. And a second transmission step in which the first node device transmits, to the access router of the predicted movement destination, a second message in which the IP address of the second node device is specified, and the first node When the label switching router connected to the access router receives the CoA of the device and receives the instruction from the access router that accommodates the second node device, the second node device is First setting of a first temporary label switching path for switching data to be transmitted to the first node device At the label switching path setting step and the instruction of the predicted movement destination access router that has received the second message specifying the IP address of the second node device, the label switching router connected to the access router is set to the second A second label switching path setting for setting a second provisional label switching path for switching data transmitted from the first node apparatus to the second node apparatus with the label switching router on the node apparatus side Step, and after moving to the predicted destination, the first node device transmits a third message to the third node device, the second node device, and the access router on the home network,
A third switching step of switching the existing label switching path to the temporary label switching path at this point, and a label switching path setting method comprising: 21. A node device, a label switching router, and an access router that accommodates the node device.
In a mobile communication system configured by a plurality of sub-networks including a node switching device and performing communication using a label switching path set between the node devices, the second node device accommodated in the second sub-network and the existing label switching While communicating using the path,
When the movement to the external sub-network is predicted, the CoA in the external network is acquired from the access router of the predicted movement destination, and further, it is accommodated in the second node device and the first sub-network which is the home network. A first message including the CoA is transmitted to the third node device, and a second message that clearly indicates the IP address of the second node device is transmitted to the access router of the predicted movement destination. And a first node device, wherein the label switching router accommodated in the second sub-network receives the first message,
Of the access switching device that accommodates the node device of
The node device of 1 sets a first temporary label switching path for switching the data transmitted to the first node device, and the access router of the predicted move destination includes the second message included in the received second message. The home address to which the first node device belongs is identified from the home address of the first node device, and the QoS information of the first node device is acquired from the home network. QoS
The first node device transmits to the second node device between itself and the label switching router accommodated in the second sub-network according to the instruction of the predicted access destination access router that has learned the information. A second temporary label switching path for switching data is set, and after moving to a predicted movement destination, the first node device is configured such that the third node device, the second node device, and the first node device. Third to the access router accommodated in the sub-network
Message is transmitted, and the existing label switching path is switched to the temporary label switching path at this time. 22. A node device, a label switching router, and an access router accommodating the node device,
In a mobile communication system configured by a plurality of sub-networks including a node switching device and performing communication using a label switching path set between the node devices, the second node device accommodated in the second sub-network and the existing label switching While communicating using the path,
When the movement to the external sub-network is predicted, the CoA in the external network is acquired from the access router of the predicted movement destination, and further, it is accommodated in the second node device and the first sub-network which is the home network. A first node device for transmitting a first message containing the CoA to a third node device, wherein the label switching router accommodated in the second sub-network receives the first message. Said second
Of the access switching device that accommodates the node device of
Node device sets a first provisional label switching path for switching data to be transmitted to the first node device, and the access router accommodated in the first sub-network The home address of the first node device and the IP address of the second node device are notified to the access router, and the predicted access destination access router receives the home address of the first node device from the received home address. The home network to which the first node device belongs is identified, and the QoS information of the first node device is acquired from the home network.
The first node device transmits to the second node device between itself and the label switching router accommodated in the second sub-network according to the instruction of the predicted access destination access router that has learned the information. A second temporary label switching path for switching data is set, and after moving to the predicted movement destination, the first node device sends a second address to the third node device and the second node device. A mobile communication system, wherein a message is transmitted and an existing label switching path is switched to the temporary label switching path at this point. 23. A node device, a label switching router, and an access router accommodating the node device,
In a mobile communication system configured by a plurality of sub-networks including a node switching device and performing communication using a label switching path set between the node devices, the second node device accommodated in the second sub-network and the existing label switching While communicating using the path,
When the movement to the external sub-network is predicted, the CoA in the external network is acquired from the predicted movement-destination access router, and the first node device that has acquired the CoA is the second node device and the second node device. A first node device for transmitting a first message including the CoA to a third node device accommodated in the first sub-network which is a home network; and accommodating in the second sub-network And the second label switching router receives the first message.
Of the access switching device that accommodates the node device of
Node device sets a first provisional label switching path for switching data to be transmitted to the first node device, and the access router accommodated in the first sub-network The IP address of the second node device and the QoS information of the first node device are notified to the access router, and the label switching router of the predicted movement destination sends the QoS.
The first node device transmits to the second node device between itself and the label switching router accommodated in the second sub-network according to the instruction of the predicted access destination access router that has learned the information. A second temporary label switching path for switching data is set, and after moving to the predicted movement destination, the first node device sends a second address to the third node device and the second node device. A mobile communication system, wherein a message is transmitted and an existing label switching path is switched to the temporary label switching path at this point. 24. When the first message to the third node device is normally accepted, the access router accommodated in the first subnetwork sends the predicted message to the predicted access destination access router. 24. The mobile communication system according to claim 23, wherein the IP address of the second node device and the QoS information of the first node device are notified. 25. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When the movement to the external subnetwork is predicted, the first node device acquires the CoA in the external network from the predicted movement destination access router CoA
An acquisition step, and a first transmission step in which the first node device that has acquired the CoA transmits a first message including the CoA to the second node device and the third node device on the home network. And a second transmitting step in which the first node device transmits a second message to the access router of the predicted movement destination, in which the IP address of the second node device is specified, and the first message is received. According to an instruction from the access router accommodating the second node device, the second node device is addressed to the first node device between the label switching router connected to the access router and the label switching router of the predicted movement destination. A first label switching path setting system for setting a first temporary label switching path for switching data to be transmitted to And the predicted access destination access router identifies the home network to which the first node device belongs from the home address of the first node device included in the received second message, The QoS information acquisition step of acquiring the QoS information of the first node device, and the label switching router connected to the access router according to the instruction of the predicted movement destination access router that has learned the QoS information is the second node device side. Second label switching path setting step for setting a second tentative label switching path for switching data transmitted from the first node apparatus to the second node apparatus, between the label switching router of After moving to the predicted movement destination, the first node device changes to the third node device and the second node device. And a third transmission step of transmitting a third message to an access router on the home network and switching an existing label switching path to the temporary label switching path at this time, and a third transmitting step, Setting method. 26. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When the movement to the external subnetwork is predicted, the first node device acquires the CoA in the external network from the predicted movement destination access router CoA
An acquisition step, and a first transmission step in which the first node device that has acquired the CoA transmits a first message including the CoA to the second node device and the third node device on the home network. And a label switching router connected to the access router that receives the first message and receives an instruction from the access router that accommodates the second node device. Label switching path setting step for setting a first provisional label switching path for switching data to be transmitted from the node device to the first node device, and the access router on the home network predicts The home address of the first node device and the second node device are addressed to the destination access router. The address notification step of notifying the IP address of the first node device and the access router of the predicted movement destination identify the home network to which the first node device belongs from the received home address of the first node device, A QoS information acquisition step of acquiring QoS information of the first node device, and a label switching router connected to the access router according to an instruction of the predicted movement destination access router that has learned the QoS information, and a second node device A second label switching path setting step for setting a second provisional label switching path for switching data transmitted from the first node apparatus to the second node apparatus, between the label switching router on the side; , After the movement to the predicted movement destination, the first node device changes to the third node And a second transmission step of transmitting a second message to the second node device and switching the existing label switching path to the temporary label switching path at this point, and setting a label switching path. Method. 27. A node device, a label switching router, and an access router accommodating the node device,
In a label switching path setting method between sub-networks including, a movable first node device is communicating with a second node device accommodated in another sub-network using an existing label switching path, When the movement to the external subnetwork is predicted, the first node device acquires the CoA in the external network from the predicted movement destination access router CoA
An acquisition step, and a first transmission step in which the first node device that has acquired the CoA transmits a first message including the CoA to the second node device and the third node device on the home network. And a label switching router connected to the access router that receives the first message and receives an instruction from the access router that accommodates the second node device. Label switching path setting step for setting a first provisional label switching path for switching data to be transmitted from the node device to the first node device, and the access router on the home network predicts The IP address of the second node device and the first node device are addressed to the destination access router. An address / QoS information notifying step for notifying the QoS information, and a label switching router connected to the access router, which is connected to the access router according to the instruction of the predicted movement destination access router learning the QoS information A second label switching path setting step for setting a second temporary label switching path for switching data transmitted from the first node apparatus to the second node apparatus, with a switching router; After moving first, the first node device transmits a second message to the third node device and the second node device, and at this point, the existing label switching path is switched to the temporary label switching path. And a label switching path setting method comprising: 28. The third transmission in the first transmission step.
28. The label according to claim 27, wherein when the first message to the node device is normally received, the access router on the home network performs the notification process in the address / QoS information notification step. Switching path setting method.