JP2003051840A - Communication method, mobile terminal and address management device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a communication method that can suppress waste of wireless resources in the case of data communication in the unit of packets in a hierarchical network. SOLUTION: An address management means (MAP) of a 2nd hierarchy informs a home agent (HA) placed on a home link of a mobile terminal (MN) about a home address of the mobile terminal (MN) and a care of address in the 2nd hierarchy on behalf of the mobile terminal (MN) by means of a 2nd coupling update message and also informs a communication opposite party (CN) of the mobile terminal (MN) about the home address of the mobile terminal (MN) and the care of address in the 2nd hierarchy by means of the 2nd coupling update message. As a result, the coupling update message from the mobile terminal (MN) to the home agent (HA) and a coupling update acknowledgement message from the home agent (HA) to the mobile terminal (MN) can be transferred not through a wireless block.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to packet-based communication using mobile IP technology between a mobile station that can freely move within a network and another mobile terminal connected to a fixed communication network or a mobile communication network. It relates to a communication method for performing.

[0002]

2. Description of the Related Art FIG. 7 shows the configuration of a packet communication system using mobile IP technology in a conventional mobile communication system.
Shown in.

In the following, the draft-i will be described with reference to FIG.
etf-mobileip-ipv6-12. In addition to the packet communication method according to Mobile IPv6 disclosed in txt, draft-ietf-mobile
eip-hmipv6-03. A case where packet communication is performed by applying the layering method shown in txt will be described.

In FIG. 7, reference numeral 1 denotes a mobile communication system as a whole. 700 is a mobile terminal (hereinafter referred to as MN)
710, 711 and 712 are router devices (hereinafter referred to as AR) having a wireless access function, and 720 and 72.
Reference numeral 1 denotes a node for hierarchization, which is called a mobility anchor point (hereinafter referred to as MAP). 73
0 is Mobile IP home agent (HA), 7
Reference numeral 31 denotes a terminal (hereinafter, referred to as CN) that is a communication partner of the MN.

In the mobile communication system configured as described above, a communication procedure when the MN 700 moves from AR 710 to under the control of AR 711 (when moving between MAPs) will be described with reference to FIG.

At the movement timing of step 801, the MN 70
When 0 moves from AR710 to AR711, MN70
0 is the agent advertisement (Age
ntAdvertisement) message 802 is received. The agent advertisement message 802 contains the IP address, prefix length, and prefix value of the new AR 711, and the upper MAP 721 of the AR 711.
IP address, prefix length, and prefix value are set.

In step 803, the MN 700 generates a local care-of address (LCoA1) used under the control of AR711 from the IP address of AR711, the prefix length and the prefix value of the received agent advertisement message 802. LCoA1 is generated by dr
aft-ietf-mobileip-ipv6-1
2. Either of the two methods disclosed in txt (stateless address configuration or stateful address configuration) may be used. For example, when using stateless address configuration,
LCoA1 is generated by generating a network address of AR711 from the IP address of AR711, a prefix length, and a prefix value, and combining the network address of AR711 and its own layer 2 address.
To generate.

In step 804, the MN 700 receives the MAP 721 of the received agent advertisement message 802.
A regional care-of address (RCoA1) used under the control of the MAP 721 is generated from the IP address, the prefix length, and the prefix value. The generation method of RCoA1 is the same as that of generation of LCoA2.
f-mobileip-ipv6-12. The two methods disclosed in txt (stateless address configuration or stateful
Address configuration).

[0009] Next, the MN 700 sends a neighbor solicitation (Neig).
hbor Solicitation) message 80
According to 5, it is confirmed whether LCoA1 is not used by another terminal. The AR 711 that has received the neighbor solicitation message 805 receives the neighbor advertisement (Neighbor Advertise) only when the LCoA 1 is already used.
transmission) message 806 to the MN 700.

Next, the MN 700 updates the binding (Bind).
ing update) message 807 causes RCo
The MAP 721 is notified of A1 and LCoA1. Actually, LCoA1 is set in the source address of the IP header, and only RCoA1 is set in the field of the binding update message and notified. Binding update message 8
Upon receiving 07, the MAP 721 confirms the binding update (Bin
ding updateAcknowledgemen
t) Send 808 to MN 700.

Further, the MN 700 has a binding update (Bin
ing message 809
Home address (HoA) and RCoA1 of HA730
To notify. Actually, RCoA1 is set in the source address of the IP header, and only HoA is set in the field of the binding update message and notified. Upon receiving the binding update message 809, the HA 730 receives the binding update confirmation (Binding update Acknowledge).
(dgement) 810 to the MN 700.

Further, the MN 700 has a binding update (Bin
ming update) message 811
The home address (HoA) and RCoA1 of is also notified to the communication partner CN 731. In reality, RCoA1
Is set to the source address of the IP header and only HoA is set to the field of the binding update message,
Be notified. CN that received the binding update message 811
731 is a binding update confirmation (Binding update
e Acknowledgement 812 to MN7
To 00.

By the above procedure, the CN 731 can recognize the MAP where the mobile terminal MN 700 is located. further,
The MAP 721 can recognize the AR where the mobile terminal MN 700 is located.

For example, when transferring a packet from CN 731 to MN 700 (address HoA), CN 73
1 is the home address HoA of MN700 and MN700
Regional care-of address RC of MAP where is currently located
Since the relationship of oA1 is stored, when transferring a packet addressed to HoA, the MAP 7 where the MN 700 is located once is temporarily transferred.
21 (RCoA1).

The MAP 721 uses the regional care-of address RCoA1 and the local care-of address LC of the MN 700.
Since the relationship of oA1 is stored, when a packet addressed to RCoA1 is received, it is transferred to AR711 (LCoA1). Since the AR 711 stores the relationship between the LCoA1 and the layer 2 address of the MN 700, the AR 711 can transfer the received packet addressed to the LCoA1 to the MN 700.

In the mobile communication system configured as described above, a communication procedure when the MN 700 moves from the AR 710 to under the control of AR 711 (when it moves under the same MAP) will be described with reference to FIG.

In step 901, when the MN 700 moves from the AR 711 to the AR 712, the MN 700 receives the new AR.
712 to Agent Advertisement
reception) message 902. The agent advertisement message 902 includes a new AR 712.
The IP address, the prefix length and the prefix value of the AR 712, and the IP address, the prefix length and the prefix value of the upper MAP 721 of the AR 712 are set.

In step 903, the MN 700 generates a local care-of address (LCoA2) to be used under the control of the AR 712 from the IP address of the AR 712, the prefix length and the prefix value of the received agent advertisement message 902. The method of generating LCoA2 is
The method is the same as the method of generating LCoA1, and the description is omitted.

Next, the MN 700 receives the MA of the agent advertisement message 902 received in step 904.
A regional care-of address (RCoA2) used under the control of MAP721 is generated from the IP address of P721, the prefix length, and the prefix value. RCoA2
The method of generating RcoA1 is the same as the method of generating RCoA1, and the description thereof is omitted.

Here, after generating LCoA1, R
Although CoA1 is generated, the generation order of LCoA1 and RCoA1 may be reversed.

Next, the MN 700 sends a neighbor solicitation (Neig).
hbor Solicitation) message 90
Check 5 to see if LCoA2 is not being used by another terminal. The AR 712 receiving the neighbor solicitation message 905 receives the neighbor advertisement (Neighbor Advertisement) only when the LCoA2 is already used.
message) 906 to the MN 700.

Next, the MN 700 updates the binding (Bind).
ing update) message 907 causes RCo
The MAP 721 is notified of A2 and LCoA2. Actually, LCoA1 is set in the source address of the IP header, and only RCoA1 is set in the field of the binding update message and notified. Binding update message 9
Upon receiving 07, the MAP 721 confirms the binding update (Bin
ding updateAcknowledgemen
t) Send 908 to MN 700.

In FIG. 9, the MN 700 further includes the HA 7
I sent a binding update message to 30 and CN731,
RCoA2 generated by moving to AR712 and AR71
Since RCoA1 generated in 1 is the same, MAP7
It is judged that it has not moved from 21 and HA730 and CN
The binding update message for 731 is not transmitted.

With the above procedure, the CN 731 can recognize the MAP where the mobile terminal MN 700 is located. further,
The MAP 721 can recognize the AR where the mobile terminal MN 700 is located.

For example, when a packet is transferred from CN 731 to MN 700 (address HoA), CN 73
1 is the home address HoA of MN700 and MN700
Regional care-of address RC of MAP where is currently located
Since the relationship of oA1 (= RCoA2) is stored, H
When a packet addressed to oA is transferred, it is temporarily transferred to MAP 721 (RCoA1 = RCoA2) where MN 700 is located.

Since the MAP 721 stores the relation between the regional care-of address RCoA1 (= RCoA2) of the MN 700 and the local care-of address LCoA2, the R
When a packet addressed to CoA1 (= RCoA2) is received,
Transfer to AR712 (LCoA2). AR712
Stores the relationship between the LCoA2 and the layer 2 address of the MN 700, so that the received packet addressed to LCoA2 can be transferred to the MN 700.

As described above, the MN 700 uses the AR 71
0, AR711, AR712, even if the MN700 moves to the local care-of address LCoA1, L
CoA2 and regional care-of addresses RCoA1, RC
oA2 is generated, and the layer 2 address and home address HoA of these are generated, AR711, AR712, and MA.
By notifying P721, HA730, and CN731, it becomes possible to continue communication.

[0028]

However, the draft-ietf-mobileip shown in the above-mentioned prior art is used.
-Ipv6-12. In the technology disclosed in txt, as shown in FIG. 8, every time the mobile terminal MN moves through the AR, the binding update message MA is transmitted via the wireless line.
There is a problem that radio resources are wasted because P, HA, and CN need to be notified. Further, in the mobile terminal MN, there is a problem that the battery is exhausted due to the transmission and reception of the message, and the continuous communication time and the standby time are shortened.

The present invention has been made in view of the above points, and an object thereof is to provide a communication method, a mobile terminal device, and an address management device which can solve the above problems all at once.

[0030]

(1) A communication method of the present invention is a communication method in a mobile communication system for performing data communication in units of packets in a hierarchical network, in which a mobile terminal (MN) is , The home address of the mobile terminal (MN), the care-of address in the first layer, the care-of address in the second layer, and the address of the home agent (HA) in the second by the first binding update message.
To the address management means (MAP) of the second layer, and the address management means (MAP) of the second layer uses the second binding update message to send the home address of the mobile terminal (MN) and the care-of address in the second layer. And the mobile terminal (M
Home agent (H) located on the home link of N)
Notify A).

(2) The communication method of the present invention is a communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, in which the mobile terminal (MN) performs the first binding update. The message notifies the home address of the mobile terminal (MN), the care-of address in the first layer, the care-of address in the second layer, and the address of the communication partner (CN) to the address management means (MAP) in the second layer. Then, the second layer address management means (MAP) sends the home address of the mobile terminal (MN) and the care-of address in the second layer to the communication partner (MN) of the mobile terminal (MN) by the second binding update message. CN).

(3) The communication method of the present invention is a communication method in a mobile communication system for performing data communication in packet units within a hierarchical network, in which the mobile terminal (MN) performs the first binding update. By the message, the home address of the mobile terminal (MN), the care-of address in the first layer, the care-of address in the second layer, the address of the home agent (HA), and the address of the communication partner (CN) are transmitted in the second layer. Notifying the address management means (MAP), the second layer address management means (MAP)
The second binding update message notifies the home address of the mobile terminal (MN) and the care-of address in the second layer to the home agent (HA) located in the home link of the mobile terminal (MN), and the second layer. The address management means (MAP) of the
The home address of the mobile terminal (MN) and the care-of address in the second layer are used as the communication partner (C) of the mobile terminal (MN).
Notify N).

According to these methods, the mobile terminal (MN)
In place of the second layer address management means (MAP)
However, the second binding update message causes the mobile terminal (M
N) the home address and the care-of address in the second layer are notified to the home agent (HA) located in the home link of the mobile terminal (MN), and the address management means (MAP) in the second layer makes The binding update message of 2 notifies the home address of the mobile terminal (MN) and the care-of address in the second layer to the communication partner (CN) of the mobile terminal (MN). The binding update message to (HA) and the binding update confirmation message from the home agent (HA) to the mobile terminal (MN) are transferred without passing through the wireless section. As a result, it is possible to suppress the consumption of the battery of the mobile terminal (MN) due to the transmission and reception of messages without wasting radio resources.

(4) The mobile terminal (MN) device of the present invention is
A mobile terminal (M, used in a mobile communication system for performing packet-based data communication in a hierarchical network
N) the device, the first binding update message
Own home address, care-of address in the first layer, care-of address in the second layer, and communication partner (C
The address of N) and the address management means (M
(AP) is notified.

With this configuration, it is possible to obtain a mobile terminal (MN) device which can favorably realize the communication method (1).

(5) The mobile terminal (MN) device of the present invention is
A mobile terminal (M, used in a mobile communication system for performing packet-based data communication in a hierarchical network
N) the device, the first binding update message
Own home address, care-of address in the first layer, care-of address in the second layer, and communication partner (C
The address of N) and the address management means (M
(AP) is notified.

With this configuration, it is possible to obtain a mobile terminal (MN) device which can favorably realize the communication method (2).

(6) The mobile terminal (MN) device of the present invention is
A mobile terminal (M, used in a mobile communication system for performing packet-based data communication in a hierarchical network
N) the device, the first binding update message
The home address of itself, the care-of address in the first layer, the care-of address in the second layer, the address of the home agent (HA), and the address of the communication partner (CN) are used as the address management means (MAP) of the second layer. Adopt a configuration to notify.

With this configuration, it is possible to obtain a mobile terminal (MN) device which can favorably realize the communication method (3).

(7) The address management device of the present invention is an upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a mobile terminal (MN). Second binding update message when the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent (HA) are received by the first binding update message from Thus, the home address (HA) of the mobile terminal (MN) and the care-of address in the upper layer are notified to the home agent (HA) located on the home link of the mobile terminal (MN).

According to this configuration, it is possible to realize an address management device that can favorably realize the communication method (1).

(8) The address management device of the present invention is an upper-layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a mobile terminal (MN). Second binding update message when the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the communication partner (CN) are received by the first binding update message from Thus, the home address of the mobile terminal (MN) and the care-of address in the upper layer are notified to the communication partner (CN) of the mobile terminal (MN).

According to this structure, it is possible to obtain the address management device which can favorably realize the communication method (2).

(9) Further, the address management device of the present invention is
An upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, which is a first device from a mobile terminal (MN).
When the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent (HA), and the address of the communication partner (CN) are received by the binding update message of The binding update message of the mobile terminal (M
N) the home address and the care-of address in the upper layer are notified to the home agent (HA) of the mobile terminal (MN), and the home address of the mobile terminal (MN) and the care-of address in the upper layer are notified by the third binding update message. And the communication partner (CN) of the mobile terminal (MN) are notified.

According to this structure, it is possible to obtain the address management device which can favorably realize the communication method (3).

(10) The communication method of the present invention is a communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, in which a mobile terminal (MN) sends a neighbor solicitation message, Mobile terminal (M
N) The care-of address in the first layer and the care-of address in the second layer are notified to the address management means (AR) of the first layer, and the address management means (A) of the first layer is notified.
R) sends a binding update message to the mobile terminal (MN).
Of the care-of address in the first layer and the care-of address in the second layer of the second layer of address management means (M
AP).

According to this method, the binding update message from the mobile terminal (MN) to the address management means (MAP) of the second layer and the mobile terminal (M) from the second address management means.
The binding update confirmation message to N) is transferred without passing through the wireless section. As a result, waste of wireless resources can be suppressed. Further, it is possible to suppress the battery consumption of the mobile terminal (MN) due to the transmission and reception of the message.

(11) A mobile terminal (MN) device according to the present invention is a mobile terminal (MN) device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a neighbor request device. By the message, the care-of address in the first layer and the care-of address in the second layer of the address management unit (A
R) is notified.

With this configuration, it is possible to obtain a mobile terminal (MN) device which can favorably realize the communication method (10).

(12) The address management device of the present invention is a lower layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a mobile terminal (MN). When the care-of address in the lower layer of the mobile terminal (MN) and the care-of address in the upper layer are received by the neighbor solicitation message from the mobile node (MN), the binding update message causes the care-of address in the lower layer and the upper layer of the mobile terminal (MN) to be received. The care-of address and the address management means (MAP) in the upper layer are notified.

According to this structure, it is possible to obtain the address management device which can favorably realize the communication method (10).

(13) The communication method of the present invention is a communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, in which a mobile terminal (MN) sends a neighbor solicitation message, Mobile terminal (M
N) the home address, the care-of address in the first layer, the care-of address in the second layer, and the address of the home agent (HA) are notified to the address management means (AR) in the first layer, and the first layer is notified. Address management means (AR) of the mobile terminal (MN), the care-of address in the first layer, the care-of address in the second layer, and the address of the home agent (HA) by the first binding update message. To the address management means (MAP) of the second layer, and the address management means (MAP) of the second layer uses the second binding update message to send the home address of the mobile terminal (MN) and the second layer. The care-of address in the above is notified to the home agent (HA) located in the home link of the mobile terminal (MN).

(14) The communication method of the present invention is a communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, in which a mobile terminal (MN) sends a neighbor solicitation message, Mobile terminal (M
N) home address, care-of address in the first layer, care-of address in the second layer, and communication partner (C)
N) address and the address management means (A
R) to notify the first layer address management means (AR)
The first binding update message causes the mobile terminal (M
N) home address, care-of address in the first layer, care-of address in the second layer, and communication partner (C)
The address of N) and the address management means (M
The AP is notified and the second layer address management means (MA
P) notifies the communication partner (CN) of the mobile terminal (MN) of the home address of the mobile terminal (MN) and the care-of address in the second layer by the second binding update message.

(15) The communication method of the present invention is a communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, in which a mobile terminal (MN) uses a neighbor solicitation message to Mobile terminal (M
N) the home address, the care-of address in the first layer, the care-of address in the second layer, the address of the home agent (HA), and the address of the communication partner (CN), the address management means (AR) of the first layer. Notify
The first layer address management means (AR) uses the first binding update message to send the home address of the mobile terminal (MN), the care-of address in the first layer, the care-of address in the second layer, and the home agent (HA). ) And the address of the communication partner (CN) to the address management means (MAP) of the second layer, and the address management means (MAP) of the second layer moves by the second binding update message. The home address (HA) of the mobile terminal (MN) is notified of the home address of the terminal (MN) and the care-of address in the second layer, and the second layer address management means (MAP) notifies the home agent (HA) of the home layer. Third
The binding update message of (2) notifies the communication partner (CN) of the mobile terminal (MN) of the home address of the mobile terminal (MN) and the care-of address in the second layer.

According to these methods, the mobile terminal (MN)
To the second layer address management means (MAP) binding update message, second address management means binding update confirmation message to mobile terminal (MN), second layer address management means (MAP) to home Agent (H
Binding update message to A) and home agent (H
The binding update confirmation message from A) to the address management means (MAP) of the second layer is transferred without passing through the wireless section. As a result, waste of wireless resources can be suppressed. Further, it is possible to suppress the battery consumption of the mobile terminal (MN) due to the transmission and reception of the message.

(16) A mobile terminal (MN) device according to the present invention is a mobile terminal (MN) device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a neighbor request device. A message is used to notify the home address of itself, the care-of address in the first layer, the care-of address in the second layer, and the address of the home agent (HA) to the address management means (AR) in the first layer. .

(17) A mobile terminal (MN) device according to the present invention is a mobile terminal (MN) device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a neighbor request device. According to the message, the home address of itself, the care-of address in the first layer, the care-of address in the second layer, and the communication partner (CN)
Address of the first layer address management means (AR)
Adopt a configuration to notify.

(18) A mobile terminal (MN) device according to the present invention is a mobile terminal (MN) device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a neighbor request device. By the message, the home management address of the first layer, the home address of the first layer, the care-of address in the first layer, the care-of address in the second layer, the address of the home agent (HA), and the address of the communication partner (CN) are stored. AR) is notified.

According to these configurations, each (1
It is possible to obtain a mobile terminal (MN) device that can favorably realize the communication methods of 3), (14), and (15).

(19) The address management device of the present invention is a lower layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a mobile terminal (MN). When the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent (HA) are received by the neighbor solicitation message from the first binding update message,
The home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent (HA) are notified to the address management means (MAP) in the upper layer.

(20) The address management device of the present invention is a lower layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a mobile terminal (MN). When the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the communication partner (CN) are received by the neighbor solicitation message from the Home address of terminal (MN), care-of address in lower layer, care-of address in upper layer, and communication partner (C
N) address and upper layer address management means (MA
P) is notified.

(21) The address management device of the present invention is a lower layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a mobile terminal (MN). When the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent (HA), and the address of the communication partner (CN) are received by the neighbor solicitation message from 1
By the binding update message of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent (HA), and the address of the communication partner (CN) in the upper layer. (MAP) is notified.

According to these configurations, (1
It is possible to obtain an address management device of a lower hierarchy that can favorably realize the communication methods 3), 14), and 15).

(22) The address management device of the present invention is an upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a lower layer address management device. When the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent (HA) are received by the first binding update message from the means (AR), the second The home agent (HA) located on the home link of the mobile terminal (MN) is notified of the home address of the mobile terminal (MN) and the care-of address in the upper layer by means of the binding update message.

(23) The address management device of the present invention is an upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a lower layer address management device. When the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, and the address of the communication partner (CN) are received by the first binding update message from the means (AR), the second The binding update message from the mobile terminal (MN) gives the home address of the mobile terminal (MN) and the care-of address in the upper layer.
The communication partner (CN) is notified.

(24) The address management device of the present invention is an upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, and is a lower layer address management device. By the first binding update message from the means (AR), the home address of the mobile terminal (MN), the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent (HA), and the address of the communication partner (CN). When receiving, the second binding update message notifies the home address (HA) of the mobile terminal (MN) and the care-of address in the upper layer to the home agent (HA) located on the home link of the mobile terminal (MN), Third
The binding update message is used to notify the home address of the mobile terminal (MN) and the care-of address in the upper layer to the communication partner (CN) of the mobile terminal (MN).

According to these configurations, (13), (1
It is possible to obtain an upper layer address management device that can favorably realize the communication methods 4) and 15).

[0068]

BEST MODE FOR CARRYING OUT THE INVENTION The essence of the present invention is to exchange a binding update message required when a mobile terminal moves,
Instead of the mobile terminal, it is shared by another device (mobility anchor point or router) that is connected to each other by wire. As a result, in the present invention, waste of wireless resources can be suppressed.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1) In FIG. 1, reference numeral 10 generally indicates the configuration of a mobile communication system according to Embodiment 1 of the present invention. The mobile communication system 10 is a draft-
ietf-mobileip-ipv6-12. txt
In addition to the packet communication method based on Mobile IPv6 disclosed in, draft-ietf-mobi
leip-hmipv6-03. Packet communication is performed by applying the layering method indicated by txt.

In FIG. 1, 400 is a mobile terminal (hereinafter,
MN), and 410, 411, 412 are router devices (hereinafter referred to as AR) having a wireless access function,
420 and 421 are nodes for layering and are called mobility anchor points (hereinafter, referred to as MAP). Reference numeral 430 is a mobile IP home agent (HA), and 431 is a terminal (hereinafter, referred to as CN) that is a communication partner of the MN.

In the mobile communication system 10 configured as described above, the MN 400 operates from the AR 410 to the AR 411.
A communication procedure when moving under the control (when moving between MAPs) will be described with reference to FIG.

In step 101, when the MN 400 moves from the AR 410 to the AR 411, the MN 400 makes a new AR.
411 to Agent Advertisement
reception) message 102 is received. The agent advertisement message 102 includes a new AR 411.
The IP address, the prefix length and the prefix value of the AR 411, and the IP address, the prefix length and the prefix value of the upper MAP 421 of the AR 411 are set.

In step 103, the MN 400 generates a local care-of address (LCoA1) used under the control of the AR 411 from the IP address, the prefix length and the prefix value of the AR 411 of the received agent advertisement message 102. LCoA1 is generated by dr
aft-ietf-mobileip-ipv6-1
2. Either of the two methods disclosed in txt (stateless address configuration or stateful address configuration) may be used. For example, when using stateless address configuration,
LCoA1 is generated by generating the network address of AR411 from the IP address of AR411, the prefix length, and the prefix value, and combining the network address of AR411 and its own layer 2 address.
To generate.

In step 104, the MN 400 sends the MAP 421 of the agent advertisement message 102 received.
A regional care-of address (RCoA1) used under the control of the MAP 421 is generated from the IP address, the prefix length, and the prefix value. The generation method of RCoA1 is the same as that of generation of LCoA2.
f-mobileip-ipv6-12. The two methods disclosed in txt (stateless address configuration or stateful
Address configuration).

Next, the MN 400 sends a neighbor solicitation (Neig
hbor Solicitation) message 10
According to 5, it is confirmed whether LCoA1 is not used by another terminal. The AR 411 receiving the neighbor solicitation message 105 receives the neighbor advertisement (Neighbor Advertise) only when the LCoA 1 is already used.
transmission) 106 message to the MN 400.

Then, the MN 400 updates the binding (Bind
ing update) message 107 to MN4
00 home address HoA, regional care-of address RCoA1 generated in procedure 103, procedure 104
Local care-of address LCoA1, M generated in
Address HA of home agent (HA) of N400
A, the address CNA of the communication partner (CN) is MAP421
To notify. Actually, LCoA1 is set to the source address of the IP header, and RCoA1, HoA, HA
A and CNA are set in the fields of the binding update message and notified. The binding update message 107 is M
The transfer of the home address HoA of the N400, the address HAA of the home agent, and the address CNA of the communication partner is the binding update message 90 in the related art.
Different from 7.

MA that received the binding update message 107
Instead of the MN 400, the P 421 notifies the HA 430 of the home address (HoA) of the MN 400 and RCoA1 by the binding update message 109. In reality, RCo
A1 is set to the source address of the IP header, and Ho
A is set in the field of the binding update message and notified. HA43 that received the binding update message 109
0 sends the binding update confirmation 110 to the MAP 421.

Further, the MAP 421 sends the home address (Ho
A) and RCoA1 are also notified to the communication partner CN431. Actually, RCoA1 is set in the source address of the IP header, and HoA is set in the field of the binding update message and notified. Upon receiving the binding update message 111, the CN 431 sends a binding update confirmation 112 to the MAP 421.

Upon receiving the binding update confirmation message 112, the MAP 421 sends the binding update confirmation 108 to the MN 400.

By the above procedure, the CN 431 can recognize the MAP where the mobile terminal MN400 is located. further,
The MAP 421 can recognize the AR where the mobile terminal MN400 is located.

For example, when a packet is transferred from CN 431 to MN 400 (address HoA), CN 43
1 is the home address HoA of MN400 and MN400
Regional care-of address RC of MAP where is currently located
Since the relationship of oA1 is stored, when transferring a packet addressed to HoA, MAP4 where MN400 is located once
21 (RCoA1).

The MAP 421 uses the regional care-of address RCoA1 and the local care-of address LC of the MN 400.
Since the relationship of oA1 is stored, when a packet addressed to RCoA1 is received, it is transferred to AR411 (LCoA1). Since the AR 411 stores the relationship between the LCoA1 and the layer 2 address of the MN 400, the AR 411 can transfer the received packet addressed to the LCoA1 to the MN 400.

Thus, as described above, in the mobile communication system 10, the binding update message 109 from the MN 400 to the HA 430 and the HA 430 to the MN 40.
0 binding update confirmation message 110, MN 400 binding update message 111 to CN 431, CN 431
From the MN 400 to the MN 400 can be transferred without passing through the wireless section,
The number of messages transferred over the air can be reduced to about one third. As a result, the mobile terminal MN40 by transmitting and receiving messages without wasting radio resources.
Prevents battery consumption of 0, MN400 and CN431
It is possible to continue communication between them.

Further, in the mobile communication system 10, HA,
The CN manages the binding update from the MN by the soft state. The soft state is a method in which a certain period of time after receiving a message is treated as a valid state and is managed as an invalid state after a certain period of time elapses.
In order to continue communication with HA, CN and H
It is necessary to continue sending the binding update message to A. In this embodiment, since the binding update message for CN and HA is transmitted from MAP, M
It is also possible to reduce the number of binding update messages that N has to send periodically by about one third.

(Embodiment 2) In FIG. 3, reference numeral 20 generally shows the configuration of a mobile communication system according to Embodiment 2 of the present invention. The mobile communication system 20 is the first embodiment.
Similarly to draft-ietf-mobileip-
ipv6-12. In addition to the packet communication method based on Mobile IPv6 disclosed in txt,
t-ietf-mobileip-hmipv6-0
3. Packet communication is performed by applying the layering method indicated by txt.

In FIG. 3, reference numeral 500 denotes a mobile terminal,
Router devices 510, 511 and 512 each have a wireless access function, and routers 520 and 521 are nodes for layering and are mobility anchor points. Reference numeral 530 is a mobile IP home agent, and 531 is a terminal that is a communication partner of the MN.

In the mobile communication system 20 configured as above, the MN 500 moves from the AR 510 to the AR 511.
A communication procedure when moving under the control (when moving between MAPs) will be described with reference to FIG.

In step 201, when the MN 500 moves from the AR 510 to the AR 511, the MN 500 makes a new AR.
511 to Agent Advertisement
reception) message 202. The agent advertisement message 202 contains a new AR 511.
The IP address, the prefix length and the prefix value of the AR 511, and the IP address, the prefix length and the prefix value of the upper MAP 521 of the AR 511 are set.

In step 203, the MN 500 generates a local care-of address (LCoA2) used under the control of the AR 511 from the IP address, the prefix length and the prefix value of the AR 511 of the received agent advertisement message 202.

In step 204, the MN 500 receives the MAP 521 of the agent advertisement message 202 received.
The regional care-of address (RCoA2) used under the control of the MAP 521 is generated from the IP address, the prefix length, and the prefix value.

Incidentally, the procedure from the next is different from that of the first embodiment. That is, following the procedure 204, the MN 500
In order to confirm whether LCoA2 is not used by another terminal and notify LMAPA2 and RCoA2 to MAP521, neighbor solicitation message 205 is sent to AR51.
Notify 1. Actually, LCoA2 is set in the source address of the IP header, and RCOA2 is set in the field of the neighbor solicitation message and notified. The neighbor solicitation message 205 is different from the neighbor solicitation message 905 in the related art in that the RCoA2 is transferred.

AR receiving the neighbor solicitation message 205
511 is a neighbor advertisement (Neighbor Advertiser) only when LCoA2 is used by another terminal.
transmission) message 206 to the MN 500.

Otherwise, the neighbor solicitation message 20
The AR 511 having received 5 notifies the MAP 521 of the RCoA2 and LCoA2 by the binding update message 207 on behalf of the MN 500. In reality, LCoA2 is
It is set in the source address of the P header, and RCoA2 is set in the field of the binding update message and notified. MAP 521 that received the binding update message 207
Stores RCoA2 and LCoA2, and then transmits a binding update confirmation message 208 to AR 511.

By the above procedure, the MAP 521 can recognize the AR where the mobile terminal MN500 after moving is located.

For example, when a packet is transferred from CN531 to MN500 (address HoA), CN53
1 is the home address HoA of MN500 and MN500
Regional care-of address RC of MAP where is currently located
Since the relationship of oA1 (= RCoA2) is stored, H
When a packet addressed to oA is transferred, it is temporarily transferred to MAP 521 (RCoA1 = RCoA2) where MN500 is located.

Since the MAP 521 stores the relationship between the regional care-of address RCoA2 (= RCoA1) of the moving destination of the MN 500 and the local care-of address LCoA2, when receiving the packet addressed to RCoA1 (= RCoA2), it is addressed to AR511 (LCoA2). Transfer to. AR
Since the 511 stores the relationship between the LCoA2 and the layer 2 address of the MN 500, the 511 receives the received LCo.
A packet addressed to A2 can be transferred to the MN 500.

Thus, as described above, in the mobile communication system 20, the MN 500 to the MAP 521.
Update message 207 to MN, MAP 521 to MN
It becomes possible to transfer the binding update confirmation message 208 to 500 without passing through the wireless section. As a result, waste of wireless resources can be suppressed. Further, it is possible to prevent the battery of the mobile terminal MN500 from being consumed due to the transmission / reception of the message, and it is possible to continue the communication between the MN500 and the CN 531 for a long time.

(Embodiment 3) In FIG. 5, reference numeral 30 generally indicates the configuration of a mobile communication system according to Embodiment 3 of the present invention. The mobile communication system 30 is the first embodiment.
Similarly to draft-ietf-mobileip-
ipv6-12. In addition to the packet communication method based on Mobile IPv6 disclosed in txt,
t-ietf-mobileip-hmipv6-0
3. Packet communication is performed by applying the layering method indicated by txt.

In FIG. 5, reference numeral 600 denotes a mobile terminal,
Reference numerals 610, 611 and 612 are router devices having a wireless access function, and reference numerals 620 and 621 are nodes for layering and are mobility anchor points. 630 is a mobile IP home agent, and 631 is a terminal which is a communication partner of the MN.

In the mobile communication system 30 configured as above, the MN 600 operates from AR 610 to AR 611.
A communication procedure when moving under the control (when moving between MAPs) will be described with reference to FIG.

In step 301, when the MN 600 moves from the AR 610 to the AR 611, the MN 600 receives the new AR.
611 to Agent Advertisement
reception) message 302 is received.

In step 303, the MN 600 generates a local care-of address (LCoA1) used under the control of the AR 611 from the IP address, the prefix length and the prefix value of the AR 611 of the received agent advertisement message 302.

In step 304, the MN 600 receives the MAP 621 of the agent advertisement message 302 received.
A regional care-of-address (RCoA1) used under the control of MAP621 is generated from the IP address, the prefix length, and the prefix value.

Next, following the procedure 304, the MN 600
Confirms whether the LCoA2 is not used by another terminal, and the home address HoA of the MN600,
The neighbor solicitation message 305 is sent to the AR 61 to notify the MAP 621 of the LCoA1, RCoA1, home agent address HAA, and communication partner address CNA.
Notify 1. Actually, LCoA1 is set to the source address of the IP header, HoA, RCoA1, HA
A and CNA are set in the fields of the neighbor solicitation message and notified. The neighbor solicitation message 305 is the MN6.
00 home address HoA, RCoA1, HAA, C
Transferring the NA is different from the neighbor solicitation message 905 in the related art.

AR that has received the neighbor solicitation message 305
611 is a neighbor advertisement (Neighbor Advertiser) only when LCoA1 is used by another terminal.
transmission) message 306 to the MN 600.

In all other cases, the neighbor solicitation message 30
The AR 611 having received 5 receives HoA, RCoA1, HA by the binding update message 307 instead of the MN 600.
The MAP 621 is notified of A and CNA. In fact, LC
oA1 is set to the source address of the IP header, and H
oA, RCoA, HAA, and CNA are set in the fields of the binding update message and notified.

MA receiving binding update message 307
P621 sends Ho by the binding update message 309.
A and RCoA1 are transmitted to HA630. In fact, R
CoA1 is set to the source address of the IP header,
HoA is set and notified in the field of the binding update message. HA that received the binding update message 307
630 sends the binding update confirmation message 310 to the MAP 62.
Send to 1.

Upon receiving the binding update confirmation message 310, the MAP 621 further replaces the MN 600 with the binding update message 311, and sends HoA and RCoA1 to CN6.
Notify 31. Actually, RCoA1 is set in the source address of the IP header, and HoA is set in the field of the binding update message and notified. Upon receiving the binding update message 311, the CN 631 transmits a binding update confirmation message 312 to the MAP 621.

Upon receiving the binding update confirmation message 312, the MAP 621 sends the binding update confirmation message 308 to the AR.
611.

By the above procedure, the CN 631 can recognize the MAP where the mobile terminal MN 600 is located. further,
The MAP 621 can recognize the AR where the mobile terminal MN600 is located.

For example, from CN 631 to MN 600 (Ho
When the packet is transferred to A), the CN 631 sends M
Since the home address HoA of N600 and the regional care-of address RCoA1 of the MAP where MN600 is currently located are stored, when forwarding a packet addressed to HoA, once MAP 621 (R
Transfer to CoA1).

The MAP 621 uses the regional care-of address RCoA1 and the local care-of address LC of the MN 600.
Since the relationship of oA1 is stored, when a packet addressed to RCoA1 is received, it is transferred to AR611 (LCoA1). Since the AR 611 stores the relationship between the LCoA1 and the layer 2 address of the MN 600, the AR 611 can transfer the received packet addressed to the LCoA1 to the MN 600.

Thus, as described above, in the mobile communication system 30, the MN 600 to the MAP 621 are connected.
Update message 307 to MAP 621 to MN
Binding update confirmation message 308 to 600, MN 600
Update message 309 from HA to 630, HA6
Binding update confirmation message 31 from 30 to MN 600
0, the binding update message 311 from the MN 600 to the CN 631 and the binding update confirmation message 312 from the CN 631 to the MN 600 can be transferred without passing through the wireless section. As a result, waste of wireless resources can be suppressed. In addition, the mobile terminal MN by sending and receiving messages
The battery consumption of 600 can be reduced, and MN600 and C
It becomes possible to continue the communication between N631 for a long time.

Furthermore, regarding the binding update messages to the CN and HA that are periodically transmitted to realize the soft state, and regarding the number of binding update messages that the MN needs to periodically send because they are sent from the MAP, It can be reduced to about one-third.

(Other Embodiments) In the above-described first embodiment, the binding update message 107 causes H
MA for oA, LCoA1, RCoA1, HAA, CNA
The MAP 421 notifies the P421 of the HoA and RCoA1 to the HA 430 by the binding update message 109, and the HoA and RCoA1 of the C by the binding update message 111.
Although the case has been described where N 431 is notified, the present invention is not limited to this, and a Hod.
A, LCoA1, RCoA1, HAA only MAP42
1, and the MAP 421 notifies the binding update message 10
9 informs HA430 of HoA and RCoA1, and C
Regarding the binding update message to N431, MN40
0 may notify HoA and RCoA1 by the binding update message 111 as in the conventional case.

Further, according to the binding update message 107,
MAP only HoA, LCoA1, RCoA1, CNA
421, and the MAP 421 notifies the CN 431 of the HoA and RCoA1 by the binding update message 111, and the binding update message to the HA 430 is M.
The N400 displays the binding update message 109 as in the conventional case.
The HoA and RCoA1 may be notified by.

Similarly, in the third embodiment, HoA, LCoA1, RCoA1, HAA, CNA are sent by the neighbor solicitation message 305 and the binding update message 307.
To the MAP 621, and the MAP 621 sends the HoA and RCoA1 to the HA 630 by the binding update message 309.
To the HoA, RCoA by the binding update message 311
However, the present invention is not limited to this, and the HoA, LCoA1, RC can be transmitted by the neighbor solicitation message 305 and the binding update message 307.
Only oA1 and HAA are notified to MAP621, and MAP6
21 receives the HoA, RC by the binding update message 309.
Notifying the HA 630 of oA1 and regarding the binding update message to the CN 631, the MN 600, as in the conventional case,
HoA and RCoA1 may be notified by the binding update message 311.

Further, by the neighbor solicitation message 305 and the binding update message 307, HoA, LCoA1, RC
Only oA1 and CNA are notified to MAP621, and MAP6
21 receives the HoA, RC by the binding update message 311.
Notifying the CN 631 of oA1 and regarding the binding update message to the HA 630, the MN 600, as in the conventional case,
HoA and RCoA1 may be notified by a binding update message 309.

In the above embodiment, the case where RCoA1 is generated after LCoA1 has been described, but the generation order of LCoA1 and RCoA1 may be reversed.

In the above embodiment, the router AR4
10-412, AR510-512, AR610-AR
The lower layer constituted by 612 is the first layer, and the mobility anchor points MAP420, MAP421,
MAP520, MAP521, MAP620, MAP6
Although the case has been described in which the upper layer configured by 21 is the second layer, the present invention is not limited to such a network configured by two layers, and a mobile communication network configured by more layers than this. Clearly applicable to In this case, regarding the relationship between the first layer and the second layer, it may be considered that the second layer is higher than the first layer.

Further, in the above-mentioned embodiment, the present invention is
draft-ietf-mobileip-ipv6-
12. Mobile IPv6 disclosed in txt
Packet communication method and draft-ietf-m
objectip-hmipv6-03. The case where the present invention is applied to a mobile communication system using the layering method shown in txt is described, but the present invention is not limited to this, and a mobile communication system for performing packet-based data communication in a layered network. Can be widely applied to.

[0123]

As described above, according to the present invention, the exchange of the binding update message, which is required when the mobile terminal moves, is replaced by another device (the first device) which is connected to each other by wire instead of the mobile terminal. It is possible to suppress the waste of radio resources by sharing them among the hierarchical address management means and the second hierarchical address management means. In addition, it is possible to prevent the battery of the mobile terminal from being consumed by sending and receiving messages.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a mobile communication system according to a first embodiment of the present invention.

FIG. 2 is a sequence diagram for explaining the operation of the mobile communication system of FIG.

FIG. 3 is a block diagram showing a configuration of a mobile communication system according to a second embodiment of the present invention.

FIG. 4 is a sequence diagram for explaining the operation of the mobile communication system of FIG.

FIG. 5 is a block diagram showing a configuration of a mobile communication system according to a third embodiment of the present invention.

FIG. 6 is a sequence diagram for explaining the operation of the mobile communication system of FIG.

FIG. 7 is a block diagram showing a configuration of a conventional mobile communication system.

8 is a sequence diagram used to explain the operation of the mobile communication system of FIG. 7 when the mobile terminal moves between different mobility anchor points (MAP).

9 is a sequence diagram for explaining the operation of the mobile communication system of FIG. 7 when the mobile terminal moves under the same mobility anchor point (MAP).

[Explanation of symbols]

Mobile communication system 400, 500, 600 Mobile terminal (MN) 410-412, 510-512, 610-612 Router device (AR) 420, 421, 520, 521, 620, 621 Mobility anchor point ( MAP) 430, 530, 630 Home agent (HA) 431, 531, 631 Counterpart terminal (CN) 101, 201, 301 Movement timing 102, 202, 302 Agent advertisement 103, 203, 303 Local care-of address generation timing 104, 204, 304 Regional care-of address generation timing 105, 205, 305 Neighbor solicitation 106, 206, 306 Neighbor advertisement 107, 207, 307 First binding update 108, 208, 308 First binding update confirmation 109, 309 Second binding Update 110, 310 the second binding update confirmation 111,311 third binding update 112, 312 third binding update confirmation

   ─────────────────────────────────────────────────── ─── Continued front page    F-term (reference) 5K030 GA10 HA08 HC09 HC20 HD09                       JL01 JT02 JT09 LB05                 5K033 CB08 DA05 DA19 DB12 DB14                       EC03                 5K067 AA11 BB21 DD51 EE02 EE16                       FF07 GG01 GG11 HH05 HH23                       JJ66 JJ71 JJ76

Claims (24)

[Claims] 1. A communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a mobile terminal sends a home address and a first address of the mobile terminal by a first binding update message. The care-of address in the first layer, the care-of address in the second layer, and the address of the home agent are notified to the address management unit in the second layer, and the address management unit in the second layer receives the second binding update message. According to the communication method, the home address of the mobile terminal and the care-of address in the second layer are notified to the home agent located on the home link of the mobile terminal. 2. A communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a mobile terminal sends a home address and a first address of the mobile terminal by means of a first binding update message. The care-of address in the first layer, the care-of address in the second layer, and the address of the communication partner are notified to the address management means of the second layer, and the address management means of the second layer concerned sends the second binding update message. According to the communication method, the home address of the mobile terminal and the care-of address in the second layer are notified to the communication partner of the mobile terminal. 3. A communication method in a mobile communication system for performing packet-based data communication within a hierarchical network, wherein a mobile terminal sends a home address and a first address of the mobile terminal by means of a first binding update message. The care-of address in the first hierarchy, the care-of address in the second hierarchy, the address of the home agent, and the address of the communication partner are notified to the address management means of the second hierarchy, and the address management means of the second hierarchy The second binding update message notifies the home address of the mobile terminal and the care-of address in the second layer to the home agent located in the home link of the mobile terminal. 3 by the binding update message, the home address of the mobile terminal and the care-of address in the second layer are added. Communication method to a communication partner of the mobile terminal. 4. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a home address of the mobile terminal device and a first layer are transmitted by a first binding update message. The mobile terminal device, which notifies the care-of address in step 2, the care-of address in the second layer, and the address of the communication partner to the address management means in the second layer. 5. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a home address of the mobile terminal device and a first layer are transmitted by a first binding update message. The mobile terminal device, which notifies the care-of address in step 2, the care-of address in the second layer, and the address of the communication partner to the address management means in the second layer. 6. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a home address of the mobile terminal device and a first layer are transmitted by a first binding update message. A mobile terminal device for notifying the address management means of the second layer of the care-of address in, the care-of address in the second layer, the address of the home agent, and the address of the communication partner. 7. An upper layer address management device used in a mobile communication system for performing packet-based data communication in a layered network, wherein the movement is performed by a first binding update message from a mobile terminal. When the home address of the terminal, the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent are received, the home address of the mobile terminal and the care-of address in the upper layer are transmitted by the second binding update message. An address management device for notifying a home agent located on a home link of a mobile terminal. 8. An upper-layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein the first mobile node uses a first binding update message from the mobile terminal to move the mobile node. When the home address of the terminal, the care-of address in the lower layer, the care-of address in the upper layer, and the address of the communication partner are received, the home address of the mobile terminal and the care-of address in the upper layer are transmitted by the second binding update message. An address management device characterized by notifying a communication partner of a mobile terminal. 9. An upper layer address management device used in a mobile communication system for performing packet-based data communication in a layered network, wherein the movement is made by a first binding update message from a mobile terminal. When the home address of the terminal, the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent, and the address of the communication partner are received, the home address of the mobile terminal and the upper layer in the upper layer by the second binding update message. The home agent of the mobile terminal is notified of the care-of address, and the home address of the mobile terminal and the care-of address in the upper layer are notified to the communication partner of the mobile terminal by a third binding update message. Address management device. 10. A communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a mobile terminal sends a care-of address in a first hierarchy of the mobile terminal in response to a neighbor solicitation message. The care-of address in the second layer is notified to the address management unit in the first layer, and the address management unit in the first layer uses the binding update message to notify the care-of address in the first layer and the care-of address in the first layer. A communication method characterized in that the care-of address in the second layer is notified to the address management means in the second layer. 11. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, comprising a care-of address and a second care-of address in its own first layer in response to a neighbor solicitation message. First care of address in hierarchy
A mobile terminal device characterized by notifying the address management means of the hierarchy. 12. A lower layer address management apparatus used in a mobile communication system for performing packet-based data communication in a layered network, the lower layer of the mobile terminal according to a neighbor request message from the mobile terminal. When the care-of address in the layer and the care-of address in the upper layer are received, the binding update message notifies the address management means of the upper layer of the care-of address in the lower layer and the care-of address in the upper layer of the mobile terminal. Address management device. 13. A communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a mobile terminal sends a home request address and a first layer of the mobile terminal in response to a neighbor solicitation message. Of the care-of address in, the care-of address in the second layer, and the address of the home agent are notified to the address management unit of the first layer, and the address management unit of the first layer uses the first binding update message to send the The home address of the mobile terminal, the care-of address in the first layer, the care-of address in the second layer, and the address of the home agent are notified to the address management unit of the second layer, and the address management unit of the second layer is notified. , The second binding update message is used to enter the home address of the mobile terminal and the second layer. A care-of address to the home agent located in the home link of the mobile terminal. 14. A communication method in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a mobile terminal sends a home request address and a first layer of the mobile terminal in response to a neighbor solicitation message. Of the care-of address in the first layer, the care-of address in the second layer, and the address of the communication partner are notified to the address management unit of the first layer, and the address management unit of the first layer uses the first binding update message to send the The home address of the mobile terminal, the care-of address in the first layer, the care-of address in the second layer, and the address of the communication partner are notified to the address management unit of the second layer, and the address management unit of the second layer is notified. , The home address of the mobile terminal and the care-of address in the second layer are forwarded by the second binding update message. A communication method characterized by notifying a communication partner of a mobile terminal. 15. A communication method in a mobile communication system for performing packet-based data communication within a hierarchical network, wherein a mobile terminal sends a home request address and a first layer of the mobile terminal in response to a neighbor solicitation message. Of the care-of address in the second layer, the care-of address in the second layer, the address of the home agent, and the address of the communication partner are notified to the address management unit of the first layer, and the address management unit of the first layer connects the first combination. The update message notifies the address management means of the second layer of the home address of the mobile terminal, the care-of address in the first layer, the care-of address in the second layer, the address of the home agent, and the address of the communication partner, The second layer address management means sends the moving end by the second binding update message. The end home address and the care-of address in the second layer are notified to the home agent located in the home link of the mobile terminal, and the address management means of the second layer uses the third binding update message to move the mobile A communication method comprising notifying a communication partner of the mobile terminal of a home address of the terminal and a care-of address in the second layer. 16. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, comprising a home request address and a care-of address in the first layer in response to a neighbor solicitation message. And a care-of address in the second hierarchy and the address of the home agent are notified to the address management means in the first hierarchy. 17. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, comprising a home request address and a care-of address in the first layer in response to a neighbor solicitation message. A mobile terminal device, which notifies the care-of address in the second layer and the address of the communication partner to the address management means in the first layer. 18. A mobile terminal device used in a mobile communication system for performing packet-based data communication in a hierarchical network, comprising a home request address and a care-of address in the first layer in response to a neighbor solicitation message. And a mobile terminal device for notifying the address management means of the first layer of the care-of address in the second layer, the address of the home agent, and the address of the communication partner. 19. A lower layer address management device used in a mobile communication system for performing packet-based data communication in a layered network, the home of the mobile terminal according to a neighbor solicitation message from the mobile terminal. When the address, the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent are received, the home address of the mobile terminal, the care-of address in the lower layer, and the care-of address in the upper layer are received by the first binding update message. And an address of a home agent are notified to an upper layer address management means. 20. An address management device of a lower layer used in a mobile communication system for performing packet-based data communication in a layered network, wherein a home of the mobile terminal is sent by a neighbor solicitation message from the mobile terminal. When the address, the care-of address in the lower layer, the care-of address in the upper layer, and the address of the communication partner are received, the home address of the mobile terminal, the care-of address in the lower layer, and the care-of address in the upper layer are received by the first binding update message. And an address of a communication partner are notified to an upper layer address management means. 21. An address management device of a lower layer used in a mobile communication system that performs packet-based data communication in a layered network, the home of the mobile terminal according to a neighbor solicitation message from the mobile terminal. When the address, the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent, and the address of the communication partner are received, the first binding update message causes the home address of the mobile terminal and the care-of address in the lower layer to be transmitted. An address management device for notifying an address management means of an upper layer of a care-of address in the upper layer, an address of a home agent, and an address of a communication partner. 22. An upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a first binding update message from an address management means of a lower layer. When the home address of the mobile terminal, the care-of address in the lower layer, the care-of address in the upper layer, and the address of the home agent are received, the home address of the mobile terminal and the care-of address in the upper layer are transmitted by the second binding update message. Is notified to the home agent located on the home link of the mobile terminal. 23. An upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a first binding update message from an address management means of a lower layer. When the home address of the mobile terminal, the care-of address in the lower layer, the care-of address in the upper layer, and the address of the communication partner are received, the home address of the mobile terminal and the care-of address in the upper layer are transmitted by the second binding update message. Is notified to the communication partner of the mobile terminal. 24. An upper layer address management device used in a mobile communication system for performing packet-based data communication in a hierarchical network, wherein a first binding update message from an address management means of a lower layer. When the home address of the mobile terminal, the care-of address in the lower layer, the care-of address in the upper layer, the address of the home agent, and the address of the communication partner are received, by the second binding update message, the home address of the mobile terminal The home agent located in the home link of the mobile terminal is notified of the care-of address in the upper layer, and the home address of the mobile terminal and the care-of address in the upper layer are communicated with the mobile agent by the third binding update message. Address tube characterized by notifying Apparatus.