JPH0955762A - Method and system for allowing terminal device connection - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the adverse influence of traffic on a network by deciding the influence exerted on the network and allowing or rejecting a connection when a mobile terminal device is connected to a subnetwork at its movement destination. SOLUTION: A network administration device is equipped with a communication observation part 1, a communication history administration part 2, an influence degree prediction part 3, a connection permission/rejection decision part 4, and an address administration device communication part 7 including a connection permission inquiry reception part 5 and a connection permission/rejection information part 6. Then an inquiry about whether the terminal device may be connected to the movement- destination subsystem is received from the address administration device which has received an address assignment request from the moved terminal device and the traffic after the movement of the terminal device is predicted from the communication history of this terminal device before its movement; and it is predicted whether or not any adverse influence on the subnetwork is exerted by this connection to decide whether or not this terminal device may be connected to the movement-destination subnetwork, and the address administration device is informed of the decision result as an answer to the inquiry.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a terminal device which moves from one sub-network to another sub-network on a communication network having a network management device and an address management device for dynamically assigning addresses to the terminal device. The present invention relates to a terminal device connection permission method and system for determining whether or not connection is possible in a movement destination subnetwork.

[0002]

2. Description of the Related Art In a conventional terminal device connection permission method and system, a network management device and an address management device that dynamically assigns an address to a terminal device operate independently and move on a communication network. There is no way for both parties to cooperate in permitting connection to the movement-destination subnetwork for the terminal device, and when the mobile terminal device makes an address allocation request to the address management device, it is not used by the address management device. Whether or not to assign an address to the terminal device is determined depending on whether or not the address is held.

[0003]

In the above conventional method and system, when the mobile terminal device makes an address allocation request to the address management device, an unused address is held in the address management device. For example, since this unused address is automatically assigned to the terminal device, the traffic generated by the terminal device may adversely affect the communication network.As the number of mobile terminal devices increases, There is a problem that the possibility of such an adverse effect increases.

In order to solve the above problems, the present invention connects a mobile terminal device that moves from one sub-network to another sub-network on the communication network, after determining the influence on the communication network. The purpose is to provide a method and system for permitting or denying.

[0005]

In order to achieve the above object, in the method of the present invention, the network management device has a communication history for each terminal device based on the amount of traffic transmitted and received by each terminal device on the communication network. Manage
The address management device, which has received the address allocation request of the moved terminal device, receives an inquiry as to whether or not the terminal device may be connected to the movement-destination subnetwork, and the terminal device is judged from the communication history of the terminal device before the movement. Predict the post-movement traffic of the device, predict whether this terminal device will be adversely affected by connecting to the destination subnetwork, and based on this prediction result, move this terminal device to the destination subnetwork. It is determined whether or not it is possible to connect to the network, and the address management device is notified of this determination result as a reply to the above inquiry.

Further, the address management device receives an address allocation request from the moved terminal device, inquires of the network management device whether or not the terminal device may be connected to the movement destination sub-network, and the network management device transmits the request. According to the reply to this inquiry, the address is assigned to the terminal device or the address assignment is refused.

In the system of the present invention, an address management device having address allocation means for dynamically allocating addresses to terminal devices and a traffic amount such as the number of packets transmitted and received by each terminal device are provided in each sub-network. A network management device having a communication observation means for periodically reading from an observation device such as a network monitor, and the network management device further manages the observation result as a communication history for each terminal device. Means, and an impact degree prediction means for predicting the traffic after the movement of this terminal device from the communication history before the movement of the mobile terminal device to predict the influence of this terminal device connecting to the movement destination sub-network, and this prediction Connection that determines whether or not this terminal device can be connected to the destination subnetwork based on the result Denial determining means and connection propriety notifying means for notifying the address management device as the answer of the connection propriety determination result in response to an inquiry from the address management device at any time whether the terminal device can be connected to the destination subnetwork. The address management device, upon receipt of an address allocation request from the moved terminal device, asks the network management device whether or not the terminal device can be connected to the destination sub-network, and a connection permission inquiry means. And an address allocation instructing means for receiving an answer from the network management device to the inquiry and instructing the address allocating means for approval or disapproval of allocating the address to the terminal device according to the answer.

[0008]

Embodiments of the present invention will now be described with reference to the drawings. 1 and 2 are diagrams showing a configuration example of a terminal device connection permission system according to the present invention.
Is a network management device, and FIG. 2 is a diagram showing details of the address management device. The network management device includes a communication observation unit 1, a communication history management unit 2, an influence degree prediction unit 3, a connection availability determination unit 4, and a connection permission inquiry reception unit 5.
And an address management device communication unit 7 including a connection permission / prohibition notifying unit 6
It is equipped with

In each sub-network, the traffic amount such as the number of packets transmitted and received by each terminal device (including the terminal device that does not move) is observed by an observation device such as a network monitor, and the communication observation unit 1 observes this observation value. Read from the device periodically. The communication history management unit 2 manages the traffic amount of each terminal device observed by the communication observation unit 1 as a communication history. The impact predicting unit 3 predicts the traffic after the movement from the communication history before the movement of the terminal device managed by the communication history management unit 2, and predicts the influence when the terminal device is connected to the movement destination sub-network. To do. The connection availability determination unit 4 determines availability of connecting the terminal device to the movement-destination subnetwork based on the result predicted by the influence degree prediction unit 3.

The connection permission inquiry reception unit 5 receives a request from the address management device which inquires whether or not the terminal device can be connected to the subnetwork to which the terminal device has moved, and receives the request from the influence prediction unit 3. Start the process. The connection availability notification unit 6 notifies the address management device of the connection availability determination result determined by the connection availability determining unit 4 as an inquiry response. The address management device communication unit 7 includes a connection permission inquiry reception unit 5 and a connection availability notification unit 6.

The address management device includes a network management device communication unit 17 and an address allocation unit 18. The address assigning unit 18 includes a mobile terminal device communication unit 16 and an address management unit 12.
The mobile terminal device communication unit 16 includes an address assignment request receiving unit 11 and an address assignment / rejection sending unit 15. The network management device communication unit 17 includes a connection permission inquiry unit 13 and an address allocation instruction unit 14.

The address allocation request receiving unit 11 receives the address allocation request from the mobile terminal device and receives the address management unit.
Notify 12 Upon receiving the notification from the address allocation request receiving unit 11, the address management unit 12 searches the held unused address, and if there is an unused address, selects the address to be allocated to this terminal device. The connection permission inquiry unit 13 inquires of the network management device whether or not the terminal device can be connected to the subnetwork to which the terminal device has moved.

The address assignment instructing section 14 receives the notification of the reply from the network management apparatus to the above inquiry, and instructs the address assignment / rejection sending section 15 to accept or reject the address assignment to this terminal apparatus according to this notification.
The address allocation / rejection transmission unit 15 allocates or rejects the address to the terminal device according to this instruction.

FIG. 3 is a diagram for explaining an example of a communication network system including a terminal device connection permission system according to the present invention. In this example, a network management device 21, a mobile terminal device 22 that can move between sub-networks, and an address. Management devices 23a-23c, network monitoring device 24a
~ 24c, routers 25a ~ 25b and sub-network 26a
Including ~ 26c. In this example, the address management device is installed in each sub-network, but the effect is the same even if one address management device is used in the entire network.

FIG. 4 is a flow chart for explaining the operations of the mobile terminal device, the network management device and the address management device, and FIG. 5 shows the communication history of each terminal device managed by the communication history management unit 2 of the network management device. It is a figure of an example of the communication history management table shown.

Next, the operation of the above system will be described.
In FIG. 3, the mobile terminal device 22 is a subnetwork 26a.
Suppose you have moved to. The mobile terminal device 22 has its MA
An address allocation request including the C address is broadcast in the subnetwork 26a (step s1 in FIG. 4).
The address allocation request receiving unit 11 of the address management device 23a receives the address allocation request from the mobile terminal device 22,
Notify the address management unit 12 (step s2 in FIG. 4).

The address management unit 12 searches for an unused address held therein (step s3 in FIG. 4). If there is no unused address, the mobile terminal device 22 is notified that there is no unused address. The mobile terminal device 22 cannot be connected, and the process ends. If there is an unused address, the address management unit 12 selects an address (address A) to be assigned to the mobile terminal device 22 (step s4 in FIG. 4), and through the connection permission inquiry unit 13, the mobile terminal device.
By the information including 22 MAC addresses and address A,
The network management device 21 is inquired whether or not the mobile terminal device 22 may be connected to the sub-network 26a (step s5 in FIG. 4).

The connection permission inquiry receiving unit 5 of the network management device 21 receives the inquiry request from the address management device 23a (step s6 in FIG. 4) and activates the processing of the influence predicting unit 3. The network management device 21 is a mobile terminal device included in the inquiry information from the address management device 23a.
The 22 MAC address and the address A identify this terminal device and the sub-network to which this terminal device belonged before the movement. The impact predicting unit 3 includes the communication history managing unit 2
Predict the post-movement traffic of the mobile terminal device 22 from the communication history of the terminal device 22 managed by the mobile terminal device 22 and predict the impact of connecting this terminal device to the sub-network 26a. (Fig. 4, step s7).

In this example, the communication history management section 2 manages the communication history as follows. The communication history management unit 2 holds a communication history management table 31 as shown in FIG. The network monitor devices 24a to 24c observe packets in the sub-networks 26a to 26c,
The number of transmitted / received packets for each terminal device is totaled for each subnetwork to which the communication partner is connected. The communication observation unit 1 uses the aggregated observed communication traffic to monitor the network monitoring device 24a.
.About.24c at a time interval .DELTA.t, then reset all counters of the network monitoring devices 24a to 24c. The communication history management unit 2 divides the observed communication amount read by the communication observation unit 1 by the time interval Δt to calculate the number of packets per second, and the value is larger than the maximum communication amount in the communication history management table 31 in which it is held. If the maximum communication amount is updated. The above processing is repeated for the time interval T, and the time interval T
Find the maximum amount of communication in.

The communication history management unit 2 adds the average of the maximum communication amount in the time interval T to the communication history of the communication history management table 31 and takes an average to update the communication history. Now, in the communication history management table 31, the MAC address address 1
If the maximum amount of communication in the time interval T is observed to be maxvalue 11 when the terminal device indicated by is connected to the subnetwork indicated by subnetwork 1, the communication history history 11 is the number of times the communication history has been updated so far. Let N1 be the equation (history 11 × N1 + maxvalue 11) / (N1 +
It is updated with the value of 1).

The above processing is repeated to update the communication history in the communication history management table 31. For example, if Δt is 1 hour and T is 1 day, it is necessary to determine whether or not to update the maximum traffic based on the traffic observed every hour. Will remain as the value of maximum traffic. The communication history is updated every day by adding the maximum daily communication amount to the communication history and taking an average.

Now, in the communication history management table 31,
The MAC address of the mobile terminal device 22 is address 1,
Subnetworks 26a-26c are each subnetwork 1
~ Subnetwork 3 means that mobile terminal 22 is connected to subnetwork 26a.
The communication history between 22 and the sub-networks 26a to 26c is history 11 to history 13, respectively.

The influence predicting unit 3 connects the mobile terminal device 22 to the subnetwork 26a based on this communication history, so that the traffics of the subnetworks 26a to 26c are increased by history 11 to history 13, respectively, and the router 2
The traffic relayed by 5a is (history 12 + histor
y 13) and predict that the traffic relayed by router 25b will increase by history 13.

Then, the actual traffic at that time is
Sub-networks 26a-26c are traffic 1-tr respectively
affic 3, routers 25a and 25b are traffic 4 respectively
And 5 are observed, the traffic after the mobile terminal device 22 is connected to the subnetwork 26a is as follows: Subnetwork 26a: traffic 1 + history 11 Subnetwork 26b: traffic 2 + history 12 Subnetwork 26c: traffic 3 + history 13 Router 25a: traffic 4 + history 12 + history 13 Router 25b: traffic 5 + history 13 can be predicted.

If there is no communication history when the mobile terminal device 22 is connected to the subnetwork 26a (subnetwork 1), the average of the communication history when moving to another subnetwork is used, for example. And make a similar prediction.
Letting the average values of the communication history between the mobile terminal device 22 and the sub-networks 26a to 26c be history 1 to history 3, respectively, the traffic after the mobile terminal device 22 connects to the sub-network 26a uses this average value, Sub-network 26a: traffic 1 + history 1 Sub-network 26b: traffic 2 + history 2 Sub-network 26c: traffic 3 + history 3 Router 25a: traffic 4 + history 2 + history 3 Router 25b: traffic 5 + history 3 It can be predicted.

The connection availability determination unit 4 uses the prediction result and sets the prediction result for the sub-networks 26a-26c for detecting the capacity of the sub-networks 26a-26c or the traffic abnormality of each sub-network. For each of the routers 25a to 25b, the prediction result is compared with the threshold value set for detecting the relay capacity of each of the routers 25a to 25b or the overload condition of each router (Fig. 4). Step s8).

As a result of the comparison, if all are not exceeded, it is judged that there is no adverse effect, and it is decided to permit the connection of the mobile terminal device 22 to the sub-network 26a (step s in FIG.
9). If any one of them is exceeded, it is determined that there is an adverse effect and the sub-network 26 of the mobile terminal device 22.
It is decided to refuse the connection to a (Fig. 4, step s10).
). The connection availability notification unit 6 notifies the address management device 23a of the connection availability determination result determined by the connection availability determination unit 4 as a reply to the inquiry (step s11 in FIG. 4).

The address assignment instructing section 14 of the address management device 23a receives the reply from the network management device 21 (step s12 in FIG. 4), and the mobile terminal device according to this reply.
The address allocation / rejection transmission unit 15 is instructed to allocate or reject the address A to 22. The address assignment / rejection transmission unit 15 assigns the address A to the mobile terminal device 22 when the instruction is permitted (step s13 in FIG. 4). When the instruction is refusal, the mobile terminal device 22 is notified of the refusal. In this case, the mobile terminal device 22 cannot be connected, and the process ends. The mobile terminal device, to which the address A is assigned, uses the address A to connect to the sub-network 26a and start using it (step s14 in FIG. 4).

[0029]

As described above, according to the present invention,
When the mobile terminal device tries to connect to the destination subnetwork, the network permits or rejects the connection after determining the effect on the network when the mobile terminal device connects to the destination subnetwork. This makes it possible to reduce the possibility that the network will be adversely affected by the traffic generated by the terminal device.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a network management device in a configuration example of a terminal device connection permission system according to the present invention.

FIG. 2 is a diagram showing a configuration of an address management device in a configuration example of a terminal device connection permission system according to the present invention.

FIG. 3 is a diagram illustrating an example of a communication network system including a terminal device connection permission system according to the present invention.

FIG. 4 is a flowchart illustrating operations of a mobile terminal device, a network management device, and an address management device.

FIG. 5 is a diagram of an example of a communication history management table showing a communication history of each terminal device managed by the communication history management unit 2 of the network management device.

[Explanation of symbols]

 1 Communication observation unit 2 Communication history management unit 3 Impact degree prediction unit 4 Connection permission / inhibition determination unit 5 Connection permission inquiry reception unit 6 Connection permission / inhibition notification unit 7 Address management device communication unit 11 Address allocation request reception unit 12 Address management unit 13 Connection permission Inquiry unit 14 Address allocation instruction unit 15 Address allocation / rejection transmission unit 16 Mobile terminal device communication unit 17 Network management device communication unit 18 Address allocation unit 21 Network management device 22 Mobile terminal device 23 Address management device 24 Network monitoring device 25 Router 26 Sub-network 31 Communication history management table

Claims (2)

[Claims] 1. A terminal device which permits the use of a moved terminal device by dynamically allocating an address to a mobile terminal device that has moved from one sub-network to another sub-network on a communication network. In the connection permission method, the network management device manages the communication history of each terminal device based on the amount of traffic transmitted and received by each terminal device on the communication network, and the address management device that receives the address allocation request from the moved terminal device , Asks the network management device whether or not the terminal device may be connected to the destination sub-network, and the network management device
Predicting the traffic after the movement of the terminal device from the communication history before the movement of the terminal device, and predicting whether the sub-network will be adversely affected by connecting the terminal device to the movement destination sub-network, Based on the prediction result, it is determined whether or not the terminal device may be connected to the movement-destination subnetwork, the address management device is notified of the determination result as a reply to the inquiry, and the address management device performs network management. A method for permitting connection of a terminal device, which comprises allocating an address to the terminal device or denying the address allocation according to the response from the device. 2. An address management device having address allocation means for dynamically allocating an address to a terminal device in a movement destination subnetwork as the terminal device moves between subnetworks, and transmission / reception between each terminal device on a communication network. In a terminal device connection permission system including a network management device having communication observation means for periodically reading observation values from an observation device such as a network monitor that observes traffic volume such as the number of packets Further, a communication history management unit that manages the observation result as a communication history, and predicts the traffic after the movement of the terminal device from the communication history before the movement of the mobile terminal device, and connects the terminal device to the movement destination sub-network. And a terminal device based on the prediction result. Connection availability determination means for determining availability of connection to the destination sub-network, and connection availability determination in response to an inquiry request from the address management device regarding availability of connection of the terminal device to the destination sub-network. The address management apparatus further includes a connection availability notification unit that notifies the address management apparatus of the result as a response, and the address management apparatus further receives the address allocation request from the moved terminal apparatus and connects the terminal apparatus to the movement destination subnetwork. Connection permission inquiring means for inquiring the network management device whether or not the address is accepted, and instructing the address allocation means for accepting or rejecting the reply from the network management device for the inquiry and allocating the address to the terminal device according to the answer. And a terminal device connection characterized by comprising: Permission system.