JP2003060685A - Mobile communication system, home agent, correspondent node, mobile terminal, mobile communication method, program and recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To transfer a packet while ensuring QoS even upon occurrence of hand over between a correspondent node and a mobile terminal under a large scale mobile network environment. SOLUTION: In case of hand over incident to movement of a mobile terminal in a repeater agent pertaining to repeat of an optimal route set already, an optimal route is reset for minimum necessary repeater agents.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mobile communication system capable of continuing communication even when a mobile terminal moves in a MoIP (IP (Internet Protocol) network premised on mobile communication) across subnets in the network. The present invention relates to an IP handover communication technique.

[0002]

2. Description of the Related Art With the rapid development of mobile networks, IP mobility control technology in a mobile environment has attracted attention. With the MoIP technology, even if the mobile node changes the subnet in the IP network, communication is continued using only the permanent IP home address. For details of MoIPv4, see IETF RFCs 2002, 2003 and 200.
4, 1701, 2005, 2006.
The details of MoIPv6 are, for example, draft-i.
It is specified in etf-mobileip-ipv6-13.

Handover technology is a technology for continuing communication even when a communication host moves between subnets during communication by MoIP. The IETF also uses Mobility Support in IPv6 as a handover technique.
<draft-ietf-mobileip-ipv6-14.txt>, Fast Ha
ndovers for Mobile IPv6 <dra
ft-ietf-mobileip-fast-mipv6-01.txt> etc. have been discussed. Various techniques have been introduced to implement QoS (Quality of Service) guarantee of data in communication even in these handover techniques, but mobile IP is widely used.
Specific Q because it is defined to apply to communication in general
We have not discussed cooperation with oS signaling. Here, a path satisfying the QoS is called a QoS path, and a signal exchange performed for setting the QoS path is called a QoS signaling.

FIG. 13 shows a conventional handover procedure.
In the conventional mobile communication system, the correspondent terminal CN sets an optimum route with the mobile terminal MN via the relay agent TA in the destination area of the mobile terminal MN.
At this time, when the mobile terminal MN moves, all the relay agents other than the relay agent at the edge perform a handover by newly setting an optimum route.

Here, the optimum route is the route most suitable for data transfer for both the mobile terminal MN and the communication partner terminal CN that perform communication. The most suitable route for data transfer can generally be said to be the shortest route, but this shortest route means not only that the physical distance is short, but that the transmission capacity is not the shortest physical distance. In terms of, it can be included in the case of being most suitable for data transfer. In the present invention described later, it is a condition of the optimum route that the QoS is further satisfied.

[0006]

In order to realize high performance handover, it is essential to execute QoS guarantee of traffic during communication even if the communication host moves. There are problems that cannot be solved only by high-speed switching of communication paths. That is, in order to guarantee the QoS of the mobile terminal, only 1) before the handover, 2) during the handover, and 3) after the handover, the QoS guarantee of the packet transfer route is performed between the correspondent terminal and the mobile terminal. Instead, it becomes important to cooperate with each process of 1), 2), and 3) to perform state transition between processes while guaranteeing QoS.

However, in the prior art, first, there was no handover communication system interlocking with QoS setting signaling, so that QoS guaranteed transfer could not be carried out even in the independent processes 1), 2) and 3). To implement QoS guarantee, RSVP (Resource Reservation Protocol)
l), Q such as MPLS (Multi protocol Label Switching)
Although it is necessary to carry out independent cooperation with the os guarantee technology, there is no efficient method so far.

The present invention has been made against such a background, and in a large-scale mobile network environment, even when a handover occurs between a communication partner terminal and a mobile terminal, QoS is generated.
It is possible to provide an IP mobility control technique that enables guaranteed packet transfer.
Applicable to both IPv4 and MoIPv6, and
RSVP, MP which is the conventional QoS path setting mechanism
An object of the present invention is to provide a mobile communication system, a home agent, a communication partner terminal, a mobile terminal, a mobile communication method, a program, and a recording medium, which can provide an IP mobility control technique capable of guaranteeing QoS with a simple function enhancement of LS signaling. And

[0009]

According to the present invention, among the relay agents involved in the relay of the optimum route that has already been set, the optimum route is re-established for the minimum necessary relay agents at the time of handover accompanying the movement of the mobile terminal. By performing the setting, it is only necessary to re-set a part of the already set QoS path, and therefore it is possible to efficiently perform the handover process while guaranteeing the QoS.

That is, the present invention is directed to QoS such as RSVP.
Qo even when handover occurs using guaranteed signaling
The main feature is that the S path can be set. Furthermore, when setting the QoS guaranteed route for handover, RSVP
The main feature is that the new route can be optimized while automatically setting the anchor point on the old route by using the signaling mechanism.

In particular, it is characterized in that the communication path for the mobile terminal which has performed the QoS guarantee can be dynamically changed according to the movement of the mobile terminal by using the QoS signaling of RSVP.

Further, according to the present invention, even if the communication route between the communication hosts is dynamically changed due to the movement of the mobile terminal in a large-scale network environment, the relay agents distributed throughout the network cooperate to perform the handover. It can be applied to a large scale mobile IP network.

In the present invention, each terminal is bound
It is premised on the application to the MoIPv6 technology that implements the Update function as a standard, but MoIPv4 also uses route optimization technology (ID: Route Optimization in Mobil IP draft-ie).
It can be applied by using tf-mobileip-optim-10.txt) together.

As a result, even in a mobile environment, a QoS path can be set reliably for communication requiring QoS guarantee, so that a highly reliable and high performance mobile network can be constructed.

RSV is used for handover control as the conventional technique.
Using P signaling, introducing the relay agent TA concept for handover, and performing anchor handover by the relay agent, RSVP R
The major difference is that anchor points are dynamically selected in the relay agent network according to the communication mode using the esv message to ensure the scale of the network.

That is, a first aspect of the present invention is provided with a mobile terminal, a communication partner terminal of the mobile terminal, and a home agent for managing the location information of the mobile terminal,
The mobile terminal and the communication partner terminal are provided with means for setting an optimum route according to the location information, and a relay agent for relaying the optimum route is provided between the mobile terminal and the communication partner terminal. The mobile communication system further comprises means for executing a handover process between the plurality of relay agents according to the movement of the mobile terminal.

Here, a feature of the present invention is that the means for executing the handover process is the one in the vicinity of the mobile terminal requesting the handover process among the plurality of relay agents included in the optimum route. The relay agent including the relay agent other than the minimum required for the handover processing is excluded from the target for changing the optimum route setting and the processing is executed.

The relay agent comprises means for holding correspondence information between the address in the home agent of the mobile terminal and the address in the destination area, and the mobile terminal newly establishes the optimum route as it moves. QoS to the nearest access router to relay
The Resv message as a signaling procedure includes means for transmitting a Resv message including the relay request, and when the relay agent receives the relay request via the access router, does the relay agent itself hold the correspondence information of the mobile terminal? Means for determining whether or not, and means for resetting the optimum route via the nearest access router when the self holds the correspondence information of the mobile terminal,
When the self resets the optimum route, the Re
means for deleting the relay request included in the sv message, and means for setting the optimum route includes means for setting a route that satisfies the QoS between the mobile terminal and the communication partner terminal as the optimum route. Is desirable.

Alternatively, the resetting means resets the optimum route to the access router which is the closest to the moving destination of the mobile terminal, and the access router to which the optimum route has been set before the resetting. Also, by providing a means for reserving the setting, it is possible to carry out a seamless handover using two paths.

Further, the relay agent is divided into a plurality of groups, the plurality of groups are arranged in a hierarchical structure, and the means for executing the handover process has a plurality of units included in the optimum route for each layer. Among the relay agents, the optimum route setting for the relay agents other than the minimum relay agent required for the handover processing including the relay agent closest to the mobile terminal or closest to the adjacent layer requesting the handover processing. The mobile communication system according to the present invention can be applied to a large-scale network having a hierarchical structure by including a unit that executes the process by excluding it from the change target.

As a result, in a large-scale mobile network environment, it is possible to provide an IP mobility control technique that enables packet transfer with QoS guarantee performed even when a handover occurs between a communication partner terminal and a mobile terminal, Furthermore, it can be applied to both the conventional MoIPv4 and MoIPv6 systems, and can be further enhanced by simply expanding the functions of the conventional QoS path setting mechanism RSVP and MPLS signaling.
It is possible to provide an IP mobility control technology capable of guaranteeing os.

A second aspect of the present invention is applied to the mobile communication system of the present invention, and means for holding correspondence information between the address in the home agent of the mobile terminal and the address in the destination area, and the relay request. Means for determining whether or not the corresponding information of the mobile terminal is held by itself, and the closest access when the own information is held by the mobile terminal. A relay agent comprising means for resetting the optimum route via a router and means for deleting the relay request included in the Resv message when the self resets the optimum route. Is.

The resetting means resets the optimum route to the access router which is the closest to the moving destination of the mobile terminal, and also applies to the access router to which the optimum route was set before the resetting. Means may be provided to retain the settings.

A third aspect of the present invention is applied to the mobile communication system of the present invention, and QoS is provided to the nearest access router which newly relays the optimum route according to its own movement.
A mobile terminal comprising means for transmitting a Resv message as a signaling procedure by including a relay request.

According to a fourth aspect of the present invention, an optimum route is set between the mobile terminal and the communication partner terminal according to the location information of the mobile terminal, and the optimum route is arranged between the mobile terminal and the communication partner terminal. In the mobile communication method, the optimum route is relayed between the mobile terminal and the communication partner terminal by the relay agent, and handover processing is executed between the plurality of relay agents as the mobile terminal moves.

Here, the feature of the present invention is that it is necessary for the handover processing including the relay agent closest to the mobile terminal requesting the handover processing among the plurality of relay agents included in the optimum route. The relay agents other than the minimum number of the relay agents are excluded from the change targets of the optimum route setting and the processing is executed.

When the relay agent is divided into a plurality of groups and the plurality of groups are arranged in a hierarchical structure, the above-mentioned relay agent among the plurality of relay agents included in the optimum route is provided for each hierarchy. Excluding the relay agents other than the minimum necessary relay agent for the handover processing, which includes the relay agent closest to the mobile terminal requesting the handover processing or closest to the adjacent layer, from the target for changing the optimum route setting. Processing can also be performed.

According to a fifth aspect of the present invention, when installed in an information processing device, the information processing device has a function corresponding to a relay agent applied to the mobile communication system of the present invention. A function of retaining correspondence information between an address in a home agent and an address in a movement destination area, and determining whether or not the correspondence information of the mobile terminal is held when the relay request is received via the access router. And a function of resetting the optimum route via the nearest access router when the self holds the correspondence information of the mobile terminal, and a function of resetting the optimum route when the self resets the optimum route. A program that realizes a function of deleting the relay request included in a Resv message. A.

As the function of resetting, the optimum route is reset to the access router which is the closest to the movement destination of the mobile terminal, and the access router to which the optimum route is set before the reset is also set. It is also possible to realize the function of retaining the settings.

Alternatively, when installed in the information processing device, the information processing device has a function corresponding to the mobile terminal applied to the mobile communication system of the present invention.
It is a program that realizes a function of sending a Resv message as a QoS signaling procedure including a relay request to a nearest access router that newly relays the optimum route as the user moves.

A sixth aspect of the present invention is a recording medium in which the program of the present invention is recorded and which can be read by the information processing apparatus. The program of the present invention can be installed in the information processing apparatus using the recording medium of the present invention. The information processing apparatus can also install the program of the present invention by the information processing apparatus downloading the program of the present invention from a server holding the program of the present invention via a network.

[0032]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention is shown in FIGS.
Will be described with reference to. FIG. 1 is a diagram showing a binding registration procedure from a mobile terminal to a communication partner terminal according to the embodiment of the present invention. FIG. 2 is a diagram showing an RSVP path setting procedure from a communication partner terminal to a mobile terminal according to the embodiment of the present invention. FIG. 3 is a diagram showing the format of the Path message according to the embodiment of the present invention. FIG. 4 is a diagram showing the format of the Resv message according to the embodiment of the present invention. FIG. 5 is a diagram showing a mobile terminal handover registration procedure according to the embodiment of the present invention. FIG. 6 is a diagram showing the format of the Resv message for handover notification according to the embodiment of this invention. FIG. 7 is a diagram showing an anchor point setting judgment procedure according to the embodiment of the present invention. FIG. 8 is a diagram showing a mobile terminal handover RSVP procedure of the embodiment of the present invention. FIG. 9 is a diagram showing a mobile terminal handover RSVP packet transfer procedure according to the embodiment of the present invention. FIG. 10 is a diagram showing a mobile terminal handover RSVP packet transfer procedure according to the embodiment of the present invention. FIG. 11 is a diagram showing a packet transfer sequence according to the embodiment of the present invention. FIG. 12 is a diagram showing an example of packet transfer in the large-scale mobile network according to the embodiment of the present invention.

According to the present invention, as shown in FIG.
N, a correspondent terminal CN of the mobile terminal MN, and a home agent (not shown) that manages the location information of the mobile terminal MN, the mobile terminal MN and the correspondent terminal C
N is an optimum route that is set according to the location information, and is provided between the mobile terminal MN and the correspondent terminal CN, and includes a relay agent TA that relays the optimum route. The mobile communication system executes a handover process between a plurality of relay agents TA.

Here, the feature of the present invention is that the handover process includes the relay agent TA closest to the mobile terminal MN requesting the handover process among the plurality of relay agents TA included in the optimum route. The relay agents TA other than the minimum relay agent TA are excluded from the target for changing the optimum route setting and the processing is executed.

The relay agent TA holds the correspondence information between the address in the home agent of the mobile terminal MN and the care-of address in the destination area, and the mobile terminal MN newly relays the optimum route as it moves. The Resv message as the QoS signaling procedure including the anchor point request as the relay request is transmitted to the nearest access router AR, and the relay agent TA receives the anchor point request via the access router AR and then receives the mobile terminal MN. It is determined whether or not the mobile terminal M owns the correspondence information of
When the self holds the correspondence information of N, the optimum route is reset via the nearest access router AR, and when the self resets the optimum route, the anchor included in the Resv message. The point request is deleted and a route that satisfies the QoS between the mobile terminal MN and the correspondent terminal CN is set as the optimum route.

Further, the optimum route is reset to the access router AR2 which is the closest to the moving destination of the mobile terminal MN, and the setting is reserved for the access router AR1 to which the optimum route was set before the reset. You can also

Further, as shown in FIG. 2, the relay agent TA is divided into a plurality of groups, the plurality of groups are arranged in a hierarchical structure, and a plurality of relay agents included in the optimum route are included in each hierarchy. The optimum route setting is changed for relay agents TA other than the minimum relay agent TA required for the handover processing, including the relay agent TA closest to the mobile terminal MN requesting the handover processing in the TA or immediately adjacent to the adjacent layer. The process can be executed by excluding it from the target.

In the embodiment of the present invention, the mobile communication system of the present invention is realized by using a computer device. However, in order to realize the mobile communication system of the present invention by using the computer device, a computer device which is an information processing device is used. By installing on the computer device,
As a function corresponding to the relay agent TA applied to the mobile communication system of the present invention, a function of holding correspondence information between an address in the home agent of the mobile terminal MN and an address in the destination area, and accessing the anchor point request A function of judging whether or not the correspondence information of the mobile terminal MN is held by itself when received through the router AR, and the nearest access router AR when the correspondence information of the mobile terminal MN is held by itself. And a function to reconfigure the optimal route via
When the self resets the optimum route, the Re
A program of the present invention is used, which realizes a function of deleting the anchor point request included in the sv message.

The function of resetting the optimum route to the access router AR2 which is the closest to the moving destination of the mobile terminal MN and retaining the setting of the access router AR1 to which the optimum route was set before the resetting is realized. You can also let it.

Furthermore, by installing in a computer device, the optimum route is newly relayed to the computer device as a function corresponding to the mobile terminal MN applied to the mobile communication system of the present invention, when the user moves. A program is used which realizes a function of transmitting an anchor point request included in a Resv message as a QoS signaling procedure to the nearest access router AR.

The computer-readable recording medium in which the program of the present invention is recorded can be used as the recording medium of the present invention, and the program of the present invention can be installed in the computer by using the recording medium of the present invention. You can The computer device can also install the program of the present invention by the computer device downloading the program of the present invention from a server holding the program of the present invention via a network.

The embodiments of the present invention will be described in more detail below.

(First Embodiment) FIG. 1 shows an outline of a location registration procedure by RSVP signaling of a handover process proposed in the present invention. In the present embodiment, description will be made on the premise of the operation of MoIPv6. The access router AR1 shown in FIG.
AR2 and ARn are access routers having a direct interface with the mobile terminal MN. Furthermore, TA (1) in the figure
1, TA (1) n and TA (k) 1 are relay agents that operate as anchor points during handover proposed in the present invention. In this embodiment, the mobile terminal moves in the area surrounded by the rectangle in FIG. 1, and the relay agent in the area operates as an anchor point. At this time, the relay agent TA can be arranged hierarchically with respect to the access router AR.
(1) 1 is the anchor point of the first floor, and the relay agent TA (k) 1 is the anchor point of the kth floor. A specific anchor point set at the time of handover is dynamically selected according to the movement modes of the communication partner terminal CN and the mobile terminal MN.

First, the location registration procedure of the mobile terminal MN using RSVP signaling will be described. In FIG. 1, it is assumed that the mobile terminal moves from the home network and moves to a subnet under the access router AR1. At this time, the position of the home network (and home agent: HA) of the mobile terminal MN can be independently discussed in the present invention, and therefore, it is omitted from the figure. When the mobile terminal MN moves under the relay agent TA (1) 1,
It is assumed that the care-of address is acquired by the subnet under the access router AR1 by the stateless address acquisition mechanism of oIPv6. Further, in order to simplify the explanation, the acquired care-of IP address will be described below as CoAdd.
This will be described as r (AR1). In addition, in FIG. 1, it is assumed that the route optimization process has already been performed, and the correspondent terminal CN is the current location of the mobile terminal MN CoAddr (A
It is assumed that R1) is known.

The correspondent terminal CN of the present invention is the mobile terminal MN.
Up to setting the QoS path, the Path signaling of RSVP is used to set the QoS path on the communication path between the correspondent terminal CN and the mobile terminal MN. At this time, as shown in FIG. 1, the RSVP Path message has a transmission source address: communication destination terminal CN address, destination address:
The care-of address of the mobile terminal MN is set, and the mobile terminal MN
In order to notify that the message is addressed to the mobile terminal MN, the home address of the mobile terminal MN is set by the source route option. The mobile terminal MN that has received the Path message performs R to implement the QoS path setting.
Send the esv message. At this time, the current care-of address CoAddr (AR1) is notified to the upper layer as binding update (hereinafter referred to as BU) information.
Receiving this notification, the relay agent TA on the first floor
(1) 1 is its own Binding Cache Table in order to become operable as an anchor point.
HAdd in (Binding cache information table)
Holds binding cache information between r and CoAddr (AR1). Further, the care-of address is set to the relay agent which can be an anchor point in the upper ladder of the anchor setting area (square area in FIG. 1). In this example, the relay agent TA (1) 1 notifies the relay agent TA (k) 1 of its own care-of address CoAddr (TA1 (1)). As described above, by consolidating the care-of addresses every time the relay agent moves up to the upper hierarchy, it becomes possible to hide the micro movement of the mobile terminal MN from the communication partner terminal CN far from the mobile terminal MN. Further, for micro movement, the relay agent in the anchor area dynamically sets an anchor point in response to the movement of the mobile terminal MN and transfers the data. Relay agent TA at the edge of the anchor area
(K) One router further has its own care-of address CoAdd
r (TA (k) 1) is stored in the BU information of the Resv message and notified to the correspondent terminal CN. Upon receiving the Resv message, the correspondent terminal CN changes the care-of address of the mobile terminal MN to CoAddr (TA (k) 1). With such a care-of address relay, HAddr → C
oAddr (TA (k) 1) → CoAddr (TA
(1) 1) → CoAddr (AR1) as mobile terminal M
The actual position of N can be managed with the granularity that the relay agent of each level manages the IP address of each level. In other words, it is not necessary to manage the location of the mobile terminal MN in small units by the relay agents on the steps close to the relay plane, so that the network can be scaled. FIG. 2 shows the operation of the RSVP reservation message after the location registration is completed. Correspondent terminal C
The destination of the Path message is hierarchically converted in order to reserve the QoS path from N to the mobile terminal MN, and the destination terminal of the communicating party is hierarchically converted by the reverse route of the Resv message for confirming the reservation. You can see that it is relayed to CN. Further, in the Path message of FIG. 2, the source route option setting is carried out to notify the mobile terminal MN that even if the message addressed to the care-of address arrives, it is addressed to itself. Also, Re
The home address option is also set for the sv message, and Resv is set to the mobile terminal MN as the correspondent terminal CN.
Notify that it was sent from. Details of the Path message are attached to FIG. 3, and details of the Resv message are attached to FIG. As shown in FIG. 4, B is for the Resv message.
It can also include an indexing update option and can also be used as an updater by the information holding timer of the Binding Cache Table.

Next, FIG. 5 shows an operation example of the proposed patent when the mobile terminal MN moves and a handover occurs. Figure 5
In the figure, the mobile terminal MN moves from the subnet under the access router AR1 to the subnet under the access router AR2. When the mobile terminal MN moves to the subnet under the access router AR2, the new care-of address CoAddr (AR2) is acquired statelessly (0). After acquiring the address, the mobile terminal MN sends out a Resv message in order to carry out a handover to the new care-of address of the mobile terminal MN in the relay agent area. At this time, the Resv message is used to search and set the anchor point between the communication partner terminal CN and CoAddr (AR2). Therefore, in the Resv message, sender address: new care-of address CoAddr (AR
2), destination address: the correspondent terminal CN address is set, and the home address option and anchor request option are set in the Resv message in order to indicate that the mobile terminal MN requests an anchor request. FIG. 6 shows a Resv message format for anchor point setting including the anchor request option proposed in this patent. As shown in FIG. 6, the anchor request option is set in the Resv message and indicates a handover request from the old care-of address to the new care-of address. In the Resv message for setting the anchor point, it is assumed that the mobile IP network is configured with the target metric for uplink and downlink (assumed to be generally established in the RSVP network and the access network). Correspondent terminal C
The anchor area is transferred through the optimum route addressed to N.
At this time, Resv always reaches the destination terminal CN, so the old transfer route (CN → old MN care-of address route)
Will always be merged into.

In FIG. 5, the relay agent of the relay agent TA (1) 1 corresponds to this description. In order to determine whether the relay agent TA itself, which has received the Resv message requesting the anchor setting, should operate as the anchor point for handover, the following determination process is performed.

FIG. 7 shows a mobile terminal MN anchor point setting determination algorithm. Upon receiving the Resv message including the anchor point request, the relay agent TA (S0) first extracts the mobile terminal MN home address and the communication partner terminal CN address from the Resv message (S1).

Next, my own Binding Cache
The Table is searched (S2), and it is searched whether or not the binding registration for the extracted home address exists. If it is registered in its own table (S3), it can be determined that it should act as an anchor point, so the binding information in the table is updated (S4). In the example of FIG. 7, HAddr → AR1 to HA
The binding is updated from ddr to AR2. After the table is updated, the handover by the anchor point becomes possible, so the relay agent creates a Path message and sends it to the mobile terminal. This Path
The message indicates that the anchor point has been successfully set and notifies the mobile terminal that the data will be transferred from the relay agent (S5). See also Binding C
If no registration is found by searching the ache Table (S6), since the relay agent cannot operate as an anchor point, the Resv message is directly notified to the upstream (S7). With the above operation, it becomes possible to transfer data to the new care-of address by the optimum path branched from the anchor point of the old transfer path. In the example of FIG. 5, if the mobile terminal MN further moves to the access router ARn, the anchor point is the relay agent TA (k).
1 and the data is transferred from the relay agent TA (k) 1 to the new care-of address.

FIG. 8 shows the RS after executing the anchor handover.
An operation example of a VP signaling message is shown. The CoAddr of the relay agent TA (1) 1 is changed and Pa
th message is transferred to access router AR2,
The Resv message is relayed while being translated from the access router AR2 to the correspondent terminal CN, and the QoS path is set on the handover. FIG. 9 shows a conceptual diagram of the packet transfer described above. Correspondent terminal CN →
The data packet is transferred to the mobile terminal MN with the home address option set. Since the data packet arriving at each relay agent is transferred to a more detailed location, the access router AR2 corresponding to the actual care-of address by sequentially rewriting the destination address by the care-of address information held by each relay agent. Transferred up to.

By the implementation method described above, even if the mobile terminal moves in the IP subnet, high-performance handover can be performed in which the QoS guarantee is performed at high speed by using RSVP signaling. FIG. 11 illustrates the handover sequence described in this embodiment. As shown in FIG. 11, as the mobile terminal MN moves, the path from the correspondent terminal CN to the relay agent TA is not changed, and the path after the relay agent TA moves along with the movement of the mobile terminal MN to the access router AR1. Indicates that the access router AR2 has been changed.

(Second Embodiment) FIG. 10 shows a second embodiment of the present invention.
Will be described with reference to. In the second embodiment, bicasting of the old care-of address route and the new care-of address route is performed. In order to perform bicasting, the path is set by the new care-of address and the relay agent does not change the path of the old care-of address. In other words, at the time of handover, two pieces of binding information will coexist in the relay agent, and when the relay agent has a copy function, the data is copied and transferred by bicasting to the mobile terminal by the old and new routes. To do. At this time, upstream of the relay agent, the resources for two routes are not reserved by the RSVP reservation aggregation function, and a single resource reservation is sufficient. With such a bicasting function, even if the mobile terminal moves, data can be received by two routes while moving, so that seamless handover without data loss can be performed. As a result, a handover with a higher QoS guarantee capability can be implemented.

The resource release of the old transfer route when the handover process is decided can be realized by using the timeout function of RSVP, so that the network resource can be effectively utilized.

(Third Embodiment) FIG. 12 shows an operation example when this method is applied to a large-scale mobile network. 12
Even in a large-scale network in which the relay agents TA are distributed and arranged in a hierarchical structure, the relay agents TA can communicate with the correspondent terminal CN and the mobile terminal MN at each level.
Since it is adaptively set according to the communication path topology between the present invention and the present invention, the present invention operates with high performance even in a large-scale mobile network.

That is, the mobile terminal MN is at the lowest level.
Are directly connected to each other and operate as described in the first and second embodiments. On the other hand, in the layers other than the lowest layer, the relay agent TA at the edge of the layer lower than itself is regarded as the mobile terminal MN in the lowest layer and the handover process is executed, whereby a hierarchical structure is formed. The mobile communication system of the present invention described in the first and second embodiments can also be applied to a large-scale network.

(Summary of Embodiments) By using the QoS-guaranteed handover communication system using RSVP of the present invention, even if a handover occurs, the QoS-guaranteed handover communication can be executed, so that high-performance mobile communication can be realized. .
Further, the relay agents for implementing the present invention can be distributed and hierarchically arranged in the network, and each relay agent can dynamically act as an anchor point at the time of handover in response to the communication form, so that the number of handovers is large. It scales well even in a large-scale mobile communication network environment. Furthermore, since the mobile IP communication management and the IP-QoS guarantee management are carried out in association with each other within the same QoS guarantee signaling, the mobile management and the QoS management can be carried out efficiently.

Therefore, by using the method of the present invention, scalable mobile QoS guaranteed transfer becomes possible and a large-scale mobile network environment can be easily realized.

[0058]

As described above, according to the present invention,
In a large-scale mobile network environment, it is possible to provide an IP mobility control technique that enables packet transfer with QoS guarantee performed even when a handover occurs between a communication partner terminal and a mobile terminal. Furthermore, conventional MoIPv4,
It can be applied to both types of MoIPv6.
It is possible to provide an IP mobility control technology capable of guaranteeing QoS by simply expanding the functions of RSVP and MPLS signaling, which are S path setting mechanisms.

[Brief description of drawings]

FIG. 1 is a diagram showing a binding registration procedure from a mobile terminal to a communication partner terminal according to an embodiment of the present invention.

FIG. 2 is a diagram showing an RSVP path setting procedure from a communication partner terminal to a mobile terminal according to the embodiment of the present invention.

FIG. 3 is a diagram showing a format of a Path message according to the embodiment of the present invention.

FIG. 4 is a diagram showing a format of a Resv message according to the embodiment of this invention.

FIG. 5 is a diagram showing a mobile terminal handover registration procedure according to the embodiment of the present invention.

FIG. 6 is a Resv for handover notification according to the embodiment of the present invention.
The figure which shows the format of a message.

FIG. 7 is a diagram showing an anchor point setting determination procedure according to the embodiment of the present invention.

FIG. 8 is a mobile terminal handover RSVP according to an embodiment of the present invention.
The figure which shows the procedure.

FIG. 9 is a mobile terminal handover RSVP according to an embodiment of the present invention.
The figure which shows the packet transfer procedure.

FIG. 10: Mobile terminal handover RSV according to the embodiment of the present invention
The figure which shows the P packet transfer procedure.

FIG. 11 is a diagram showing a packet transfer sequence according to the embodiment of the present invention.

FIG. 12 is a diagram showing an example of packet transfer in the large-scale mobile network of the embodiment of the present invention.

FIG. 13 is a diagram showing a conventional handover procedure.

[Explanation of symbols]

AR access router CN correspondent terminal MN mobile terminal TA relay agent

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Senji Kawamura             2-3-1, Otemachi, Chiyoda-ku, Tokyo             Inside Telegraph and Telephone Corporation F-term (reference) 5K030 GA10 HA08 HC09 HD03 JT09                       LB05                 5K067 AA23 BB04 BB21 CC08 EE02                       EE10 EE16 JJ13 JJ64

Claims (13)

[Claims] 1. A mobile terminal, a communication partner terminal of the mobile terminal, and a home agent for managing the location information of the mobile terminal, wherein the mobile terminal and the communication partner terminal are the location information of the mobile terminal. And a relay agent provided between the mobile terminal and the communication partner terminal for relaying the optimum route according to the movement of the mobile terminal. In the mobile communication system including means for executing the handover process, the means for executing the handover process is the one in the vicinity of the mobile terminal requesting the handover process among the plurality of relay agents included in the optimum route. The relay other than the minimum required relay agent for the handover processing including the relay agent Mobile communication system comprising the means for performing the process is excluded from change target the best route setting for Jento. 2. The relay agent comprises means for holding correspondence information between an address in the home agent of the mobile terminal and an address in the destination area of the mobile terminal, and the mobile terminal newly adds the optimum information as the mobile terminal moves. For the nearest access router that relays the route, QoS (Qua
(Reity of Service) signaling means including a Resv message including a relay request, and transmitting the relay request. When the relay agent receives the relay request via the access router, the relay agent itself receives the correspondence information of the mobile terminal. Means for determining whether or not it holds, means for resetting the optimum route via the nearest access router when the self holds the correspondence information of the mobile terminal, When resetting the route, the Re
means for deleting the relay request included in the sv message, and means for setting the optimum route includes means for setting a route that satisfies the QoS between the mobile terminal and the communication partner terminal as the optimum route. The mobile communication system according to claim 1. 3. The access router for resetting the optimum route, wherein the optimum route is reset to the access router closest to the destination of the mobile terminal, and the optimum route is set before the reset. The mobile communication system according to claim 2, further comprising means for retaining the setting. 4. The relay agent is divided into a plurality of groups, the plurality of groups are arranged in a hierarchical structure, and the means for executing the handover processing is arranged for each layer.
Among the plurality of relay agents included in the optimum route, the mobile terminal requesting the handover processing, including the relay agent closest to the mobile terminal or closest to the adjacent layer, other than the minimum required relay agent for the handover processing The mobile communication system according to any one of claims 1 to 3, further comprising means for executing processing by excluding a relay agent from a target of changing the optimum route setting. 5. Applied to the mobile communication system according to claim 1, a unit for holding correspondence information between an address in the home agent of the mobile terminal and an address in a destination area, and the relay request to the access router. Means for determining whether or not the mobile terminal itself holds the correspondence information of the mobile terminal, and when it receives the correspondence information of the mobile terminal via the nearest access router. Means for resetting the optimum route; and when the self resets the optimum route, the Re
and a means for deleting the relay request included in the sv message. 6. The access router for resetting the optimal route, wherein the optimal route is reset to the access router which is the closest to the destination of movement of the mobile terminal, and the optimal route is set before the reset. 6. The relay agent according to claim 5, further comprising means for retaining the setting. 7. The mobile communication system according to claim 1, wherein a Resv message as a QoS signaling procedure is included in a Resv message as a QoS signaling procedure to a nearest access router which newly relays the optimum route according to its own movement. A mobile terminal comprising means for transmitting. 8. A mobile terminal and a communication partner terminal set an optimum route according to the location information of the mobile terminal, and the mobile terminal is configured by a relay agent arranged between the mobile terminal and the communication partner terminal. The optimum route is relayed between the mobile communication terminal and the communication partner terminal, and a handover process is performed between the plurality of relay agents according to the movement of the mobile terminal, wherein the plurality of relays included in the optimum route are included. Among the agents, the relay agents other than the minimum necessary relay agent for the handover processing, including the relay agent closest to the mobile terminal that executes the handover processing, are excluded from the change target of the optimum route setting and processed. A mobile communication method comprising: 9. The relay agent is divided into a plurality of groups, and when the plurality of groups are arranged in a hierarchical structure, among the plurality of relay agents included in the optimum route for each hierarchy. Excluding the relay agents other than the minimum relay agent required for the handover processing, which includes the relay agent closest to the mobile terminal requesting the handover processing or closest to the adjacent layer, is excluded from the change target of the optimum route setting. 9. The mobile communication method according to claim 8, wherein the mobile communication method executes the processing. 10. When installed in an information processing device, the information processing device has, as a function corresponding to a relay agent applied to the mobile communication system according to claim 1, an address in the home agent of the mobile terminal. A function of holding correspondence information with an address in a movement destination area; a function of judging whether or not the correspondence information of the mobile terminal is held when the relay request is received via the access router; A function of resetting the optimum route via the nearest access router when the self holds the correspondence information of the mobile terminal; and a function of Re when the self resets the optimum route.
A program that realizes a function of deleting the relay request included in an sv message. 11. The access router that resets the optimum route to the access router that is the closest to the destination of movement of the mobile terminal and has the optimum route set before the reset as the function of resetting 11. The program according to claim 10, which also realizes a function of retaining the setting. 12. The information processing device, when installed in the information processing device, has a function corresponding to the mobile terminal applied to the mobile communication system according to claim 1, wherein the optimum route is newly added when the user moves. A program that realizes a function of transmitting a Resv message as a QoS signaling procedure including a relay request to a nearest access router that relays the message. 13. A recording medium readable by the information processing device, in which the program according to claim 10 is recorded.