JP2002186010A - Mobile node position management method and network system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile node position management method that can detect the movement of a mobile terminal between sub networks in an optimum time corresponding to a condition requested from an application and a state of the mobile terminal. SOLUTION: A home agent individually managing each sub network and a foreign agent periodically transmit a prescribed multicast packet (message) and a mobile node receives a multicast packet of another sub-network different from a preceding multicast packet to detect the movement of the mobile node between the sub-networks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of managing the location of a mobile node in a network system, and more particularly to detecting a movement between sub-networks by receiving a message periodically transmitted on each sub-network. The present invention relates to a mobile node location management method and a network system for realizing the mobile node location management method.

[0002]

2. Description of the Related Art A conventional mobile node location management method will be described below. FIG. 4 is a diagram showing a configuration of a network system for realizing a conventional mobile node location management method described in RFC2002. In FIG. 4, 21 and 22 are mobile terminals corresponding to mobile nodes, 23 is a home agent for managing the current positions of the mobile terminals 21 and 22, and 24, 25 and 2
Reference numeral 6 denotes a foreign agent used by the mobile terminals 21 and 22 for detecting movement and registering the current position. Reference numerals 27, 28, 29, and 30 denote sub-networks under each agent.

Here, the above-mentioned conventional mobile node location management method will be described. First, the home agent 23 and the foreign agents 24 to 26 transmit an agent advertisement message to the sub-networks 27 to 30 under their own control in a periodic and broadcast packet.

In this state, for example, the mobile terminal 21
Moves from the sub-network 28 to the sub-network 29, the mobile terminal 21 changes the state of the received agent advertisement message from the one transmitted from the foreign agent 24 to the one transmitted from the foreign agent 25, and Detect movement.

As described above, in the conventional mobile node location management method, the mobile terminal always
And any one of foreign agents 24-26
And receiving an agent advertisement message sent on a different sub-network from the previous one, thereby detecting movement of the network.

[0006]

SUMMARY OF THE INVENTION However,
In the conventional mobile node location management method, the period of the agent advertisement message sent from the home agent and each foreign agent is constant for each home agent and foreign agent. Even in such a case, there is a problem that the movement between the sub-networks can be detected only at certain time intervals.

The present invention has been made in view of the above, and enables a mobile terminal to detect movement between sub-networks in an optimum time according to conditions required by an application and a state of the mobile terminal. It is an object to obtain a mobile node location management method and a network system that realizes the mobile node location management method.

[0008]

Means for Solving the Problems The above-mentioned problems are solved,
In order to achieve the object, in a mobile node location management method according to the present invention, a home agent and a foreign agent that individually manage each sub-network periodically transmit a predetermined multicast packet (message), The mobile node detects a movement between sub-networks by receiving a multicast packet of another sub-network different from the previous multi-carrier packet.

In the mobile node location management method according to the next invention, the home agent and the foreign agent transmit a plurality of multicast packets having different periods on the same sub-network, and the mobile node transmits any one of the multicast packets. Is selected to detect movement between sub-networks.

[0010] In the mobile node location management method according to the next invention, the mobile node selects any one multicast packet based on a condition required by an application.

[0011] In the mobile node location management method according to the next invention, the mobile node changes a selected multicast address according to an operation state of an application and a remaining amount of a battery.

The mobile node location management method according to the next invention is characterized in that mobile nodes are grouped in multicast packet units by assigning different parameters to a plurality of multicast packets to be transmitted.

The network system according to the next invention comprises a plurality of mobile nodes, a home agent for managing the current location of the mobile node, and a plurality of foreign agents for individually managing each sub-network. The home agent and each foreign agent periodically transmit a predetermined multicast packet (message), and the mobile node receives a multicast packet of another subnetwork different from the previous multicarrier packet, It is characterized in that movement between sub-networks is detected.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a mobile node location management method according to the present invention will be described below in detail with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment 1 FIG. 1 is a diagram showing a mobile node location management method according to the present invention. In the present embodiment, a mobile node location management method will be described using the configuration of the network system shown in FIG. Here, for convenience of explanation, a case will be described where the foreign agent sends two types of agent advertisement messages. However, the present invention is not limited to this, and three or more types of agent advertisement messages may be sent according to the application. .

In FIG. 1, reference numeral 11 denotes an agent advertisement message addressed to the multicast address A sent from the foreign agent 24 to the sub-network 28 under the foreign agent 24;
Is an agent advertisement message addressed to the multicast address B, which is sent out to a sub-network 28 under the control of the mobile terminal 21. Reference numeral 13 denotes a timing at which the mobile terminal 21 that has selected the multicast address A receives the agent advertisement message. Reference numeral 14 denotes a multicast address B. Is the timing at which the mobile terminal 22 that has selected the agent receives the agent advertisement message.

Next, the operation of the network system will be described. First, the foreign agent 24 uses a plurality of multicast addresses to send agent advertisement messages 11 and 12 having different periods for each multicast address onto the sub-network 28 under its control.

The mobile terminals 21 and 22 determine at which multicast address the agent advertisement message sent from the foreign agent 24 is to be received according to their own conditions, for example, a request (time interval) from the application. I do.

For example, when an application running on the mobile terminal 21 requests that movement between networks be detected immediately, the mobile terminal 21 selects the multicast address A. On the other hand, when the application running on the mobile terminal 22 does not require the prompt movement detection, the mobile terminal 2
In 2, the multicast address B is selected.

Here, the mobile terminal 21 transmits the agent advertisement message 11 addressed to the multicast address A.
Is received, the mobile terminal 22 receives the agent advertisement message 12 addressed to the multicast address B. That is, when the above operation is performed,
Since the cycle of the agent advertisement message 11 is shorter than the cycle of the agent advertisement message 12, the mobile terminal 21 detects the movement of the network in a shorter time than the mobile terminal 22.

As described above, in the present embodiment, the foreign agent sends a plurality of agent advertisement messages having different periods, and the mobile terminal selects a multicast address to be received according to the conditions required by the application. With such a configuration, it is possible to detect movement between sub-networks in an optimal time.

Embodiment 2 FIG. FIG. 2 is a diagram illustrating a mobile node location management method according to the present invention. In this embodiment, as in Embodiment 1, the mobile node location management method will be described using the configuration of the network system shown in FIG. Also, here, for convenience of explanation, a case will be described in which the foreign agent sends two types of agent advertisement messages. However, the present invention is not limited to this, and three or more types of agent advertisement messages may be sent according to applications. .

In FIG. 2, reference numeral 31 denotes an agent advertisement message addressed to the multicast address A sent from the foreign agent 24 to the sub-network 28 under the foreign agent 24;
Is an agent advertisement message addressed to the multicast address B, which is sent out to the sub-network 28 under the control of the mobile terminal 21. Reference numeral 33 denotes a timing at which the mobile terminal 21 receives the agent advertisement message when the multicast address A is selected. Terminal 21
Is the timing to receive the agent advertisement message when multicast address B is selected.

Next, the operation of the network system will be described. First, the foreign agent 24 uses a plurality of multicast addresses to send agent advertisement messages 31 and 32 having different periods for each multicast address to the sub-network 28 under its control.

The mobile terminal 21 determines the multicast address for receiving the agent advertisement message according to its own status, that is, the usage status of the application and the remaining time of the battery.

For example, when it is not necessary to reduce the load of the movement detection process, such as when a lightly loaded application is running or when the remaining battery level exceeds a predetermined amount, the mobile terminal 21 Selects the multicast address A. On the other hand, when it is necessary to reduce the load of the movement detection processing, such as when an application with a heavy load is running or when the remaining battery level is equal to or less than a predetermined amount, the mobile terminal 21 sets the multicast address B select.

Here, the mobile terminal 21 receives the agent advertisement message 31 when the multicast address A is selected, and receives the agent advertisement message 32 when the mobile terminal 21 selects the multicast address B. That is, when operating as described above, the mobile terminal 21 dynamically changes the short-period agent advertisement message 31 and the long-period agent advertisement message 32 according to its own state.

As described above, in the present embodiment, the foreign agent sends a plurality of agent advertisement messages having different periods, and the mobile terminal selects and receives a multicast address to be received according to its own state. Since the configuration is such that the period of the agent advertisement message is changed, the processing load and power consumption of the mobile terminal can be adjusted. In the present embodiment, the case where the period of the received agent advertisement message is changed according to its own state has been described. However, the present invention is not limited to this. For example, the state of the mobile terminal and the state described in Embodiment 1 The period of the received agent advertisement message may be changed based on a request from the application.

Embodiment 3 FIG. 3 is a diagram illustrating a configuration of a network system according to a third embodiment that can execute the mobile node location management method according to the present invention. In FIG. 3, reference numerals 41 and 42 denote mobile terminals corresponding to mobile nodes, reference numeral 43 denotes a home agent that manages the current positions of the mobile terminals 41 and 42, and reference numerals 44 and 45 denote movement detection by the mobile terminals 41 and 42. And a foreign agent used to register the current location.
6, 47 and 48 are sub-networks under the home agent 43 and the foreign agents 44 and 45, 49 and 50 are border routers between the sub-network 47 and the IP network, and 51 and 52 are sub-networks from the sub-network 47 to the IP network. Is the path to

Next, the operation of the network system will be described. The foreign agent 44 uses a plurality of multicast addresses and transmits a plurality of agent advertisement messages having different parameters for each multicast address, as in the above-described embodiment.
The data is transmitted to the sub-network 47 under its own control.

Each mobile terminal selects one of the multicast addresses assigned to the agent advertisement message sent from foreign agent 44.

For example, the mobile terminal 41 that has selected the multicast address A
The mobile terminal 42, which has received the agent advertisement message addressed to and has selected the multicast address B,
The agent advertisement message addressed to the multicast address B is received.

In this embodiment, the router 49 and the router 50 are assigned as default routers (parameters) to the agent advertisement message addressed to the multicast address A and the agent advertisement message addressed to the multicast address B, respectively. Therefore, each mobile terminal that receives this parameter,
The received default router is set as its own parameter (grouping), and the traffic from the mobile terminal 41 and the mobile terminal 42 to outside the sub-network 47 goes through the path 51 and the path 52, respectively.

As described above, in the present embodiment, mobile terminals are grouped for each received multicast address, and different parameters are set for each group, so that mobile terminals communicating within the same subnetwork are configured. Even when the traffic is concentrated, the communication quality can be prevented from deteriorating due to the traffic distribution.

[0035]

As described above, according to the present invention, instead of a broadcast packet having a fixed period for each home agent and foreign agent, the home agent and each foreign agent transmit a plurality of multicast packets having different periods. I decided to send it out. As a result, unlike the conventional technology that can detect movement between sub-networks only in a certain time,
It can detect movement between subnetworks at a desired time,
This has the effect.

According to the next invention, the home agent and the foreign agent transmit a plurality of multicast packets having different periods on the same subnetwork, and the mobile node selects any one of the multicast packets. This allows, for example,
If you want to detect movement quickly during high-speed movement,
Since a multicast packet having an appropriate cycle can be selected and received, there is an effect that movement between sub-networks can be detected at an optimal time.

According to the next invention, the home agent and the foreign agent transmit a plurality of multicast packets having different periods, and the mobile node selects a multicast address to be received according to a condition required by the application. And This way, without affecting the behavior of the application,
There is an effect that movement between sub-networks can be detected at an optimal time.

According to the next invention, the home agent and the foreign agent send a plurality of agent advertisement messages having different periods, and the mobile node
A multicast address to be received is selected according to its own state, and the period of the received agent advertisement message is dynamically changed. Thereby, there is an effect that the processing load and the power consumption of the mobile terminal can be adjusted.

According to the next invention, the mobile nodes are grouped for each multicast address to be received, and different parameters are set for each group.
As a result, even when mobile nodes communicating with each other are concentrated in the same sub-network, there is an effect that deterioration of communication quality can be prevented due to distribution of traffic.

According to the next invention, the home agent and the foreign agent transmit a plurality of multicast packets having different periods on the same sub-network, and the mobile node selects any one of the multicast packets. This allows, for example,
Even when it is desired to quickly detect movement during high-speed movement, it is possible to select a multicast packet having an appropriate period, so that a network system capable of detecting movement between sub-networks in an optimal time can be obtained. Play.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a mobile node location management method according to a first embodiment.

FIG. 2 is a diagram illustrating a mobile node location management method according to a second embodiment.

FIG. 3 is a diagram illustrating a configuration of a network system according to a third embodiment;

FIG. 4 is a diagram showing a configuration of a network system for realizing a conventional mobile node location management method.

[Explanation of symbols]

11 Agent advertisement message, 21, 22, 4
1,42 mobile terminal, 23,43 home agent, 24,25,26,44,45 foreign agent, 27,28,29,30,46,47,48
Subnetwork, 49, 50 border router, 51,
52 passes.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 5K033 CB13 CC01 DA19 DB25 EC02 5K067 AA12 AA14 AA23 AA28 AA43 CC08 DD15 DD51 FF03 FF05 FF19 GG04 GG07 JJ52 JJ64

Claims (6)

[Claims] 1. A mobile node location management method for detecting movement between sub-networks by receiving a predetermined message periodically transmitted on each sub-network, comprising: a home agent and a foreign agent for individually managing each sub-network; The agent sends out a predetermined multicast packet (message) periodically, and the mobile node detects the movement between the sub-networks by receiving the multicast packet of another sub-network different from the previous multi-carrier packet. Mobile node location management method characterized by the following. 2. The home agent and the foreign agent send a plurality of multicast packets having different periods on the same sub-network, and the mobile node selects any one of the multicast packets to move between the sub-networks. The mobile node location management method according to claim 1, wherein the mobile node location is detected. 3. The mobile node location management method according to claim 2, wherein the mobile node selects any one of the multicast packets based on a condition required by an application. 4. The mobile node location management method according to claim 2, wherein the mobile node changes the selected multicast address according to an operation state of an application and a remaining amount of a battery. 5. The mobile node location management method according to claim 2, wherein mobile nodes are grouped in multicast packet units by assigning different parameters to a plurality of multicast packets to be transmitted. 6. A network system comprising: a plurality of mobile nodes; a home agent that manages the current location of the mobile node; and a plurality of foreign agents that individually manage each sub-network. Each foreign agent periodically sends out a predetermined multicast packet (message), and the mobile node receives a multicast packet of another subnetwork different from the previous multicarrier packet, thereby moving between subnetwork. A network system characterized by detecting.