JP2004248168A - Network disconnection prevention method and computer terminal for implementing the method - Google Patents

Abstract

An object of the present invention is to provide a network disconnection prevention technology capable of preventing a disconnection of a network connection even when some of the terminals constituting the network have left the network.
An information management DB (n2) in which each computer terminal can manage network information for each terminal ID, information acquisition means (n1) for storing network information in an information management DB of an adjacent computer terminal, and an adjacent computer A departure detecting means (n4) for monitoring whether or not the terminal has departed; and acquiring network information of the computer terminal two or more hops ahead from the information management DB when the adjacent computer terminal has departed. A configuration including connection means (n3) for performing connection based on network information acquired to the computer terminal.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention belongs to a technical field for preventing division in a network by distributed computer terminals.
[0002]
[Prior art]
In a conventional client / server type network, the roles of the administrator and the user are fixed, and the server performs centralized management. However, in recent years, with the dramatic progress in computer processing capability, there has been no need to centrally manage information, and peer-to-peer systems have been developed that can directly share computer resources and services between computer terminals. -Two-peer (so-called P2P) network system technology is attracting attention.
[0003]
However, in this peer-to-peer network system, since a network is freely connected between computer terminals through a predetermined application, if a certain computer terminal is disconnected due to abnormal termination or the like, the connection is lost. There is a problem that the computer terminal connected via the terminal is disconnected.
[0004]
A specific example of the use of the peer-to-peer network system is, for example, a communication conference system disclosed in Patent Document 1. In this system, the number of lines for forming a communication conference can be reduced to (N-1) (where N is the number of terminals participating in the conference), thereby reducing communication charges. It has the advantage of being able to do so.
[0005]
[Patent Document 1]
JP-A-7-177145
[Problems to be solved by the invention]
However, in the technology disclosed in Patent Document 1, if any of the terminals constituting the network has left the network for some reason, the connection is disconnected at the position of the terminal. It is not mentioned that there is a serious problem of being done.
[0007]
The present invention has been made in view of the above circumstances, and an object of the present invention is to solve the above-described problems in the conventional technology and to provide a terminal included in a network with some problem. It is an object of the present invention to provide a network disconnection prevention method capable of preventing disconnection of a network connection even when a network device is disconnected from a network for the reason described above, and a computer terminal for realizing the method.
[0008]
Another object of the present invention is to provide a program for executing the above-described network disconnection prevention method by computer control, and a recording medium on which the program is recorded.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, a network disconnection prevention method according to the present invention is a network disconnection prevention method in a network configured in a peer-to-peer system in which individual computer terminals are directly connected. When the adjacent computer terminal B has separated from the network, the computer terminals A, C, D,... Connected via the separated computer terminal B have each separated from the network. After recognizing the above, the connection is transferred to the connecting means, the connection to the disconnected computer terminal B is released, and the computer terminal is directly connected to the computer terminal two or more hops away.
[0010]
Further, a computer terminal for realizing the network disconnection prevention method according to the present invention has an information acquiring unit capable of acquiring a network management information signal up to a computer terminal at least two hops ahead, and holds the acquired network management information signal. -It is characterized by having information management means for managing, detection means for detecting the presence or absence of connection with another computer terminal, and connection / disconnection control means.
[0011]
Here, the detecting means for detecting the presence or absence of a connection with the other computer terminal periodically sends out a packet and checks whether or not there is a response to the packet. It is preferable to confirm the presence or absence of a response.
[0012]
When connecting to the computer terminal two or more hops ahead, the connection / disconnection control unit terminates the connection unit without making a connection if the computer terminal has already been connected to the own computer terminal. Preferably, it is
[0013]
Note that the network disconnection prevention method according to the present invention can be executed by a program control by a computer, and the present invention provides a program for this and a computer-readable recording medium on which the program is recorded. It goes without saying that it extends.
[0014]
More specifically, the network disconnection prevention technology according to the present invention provides a terminal ID that uniquely determines a computer terminal in a peer-to-peer network in which individual computer terminals are directly connected. Information management database (DB) capable of managing network information for each computer, information acquisition means for storing network information of an adjacent computer terminal from the information management DB of the adjacent computer terminal to the information management DB of the own computer terminal, and an adjacent computer terminal Detection means for monitoring whether the computer terminal has left, and network information of the computer terminal two or more hops away from the information management DB when the adjacent computer terminal has left, and the computer terminal two or more hops away already Connected to a computer terminal It is determined whether or not there is a connection. If the determination result indicates that there is a connection, the process returns to the disconnection detecting means. If the determination result does not indicate that there is no connection, a connection is established based on the network information acquired to the computer terminal two or more hops away. By having a connection means for performing the connection, it is possible to prevent the disconnection of the peer-to-peer network.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail based on preferred embodiments shown in the drawings.
[0016]
The network disconnection prevention method according to the present invention is implemented in a computer terminal on a network configured by a peer-to-peer method, for example, as shown in FIG. Here, the form of the basic network is not particularly limited, and a network of any form, such as a ring or on a mesh, can be applied.
[0017]
In FIG. 1, 1, 2,..., N indicate computer terminals and N indicates a network, and each of the computer terminals 1, 2,. , N1, information management DBs 12, 22,..., N2, connecting means 13, 23,..., N3, and disengagement detecting means 14, 24,.
[0018]
Here, the information management DBs 12, 22,..., N2 are DBs that can manage network information for each terminal ID that uniquely determines a computer terminal, and the information acquisition units 11, 21,. It has a function of storing network information of an adjacent computer terminal from the information management DB of the terminal to the information management DB of the own computer terminal.
[0019]
.., N4 have a function of monitoring whether an adjacent computer terminal has left or not, and the connection means 13, 23,. Is disconnected, the network information of the computer terminal two or more hops away is acquired from the information management DB, and it is determined whether the computer terminal two or more hops away is already connected to the own computer terminal. If there is a connection, the process returns to the disconnection detecting means, and if the result of the determination is no connection, there is a function of making a connection based on the network information acquired to the computer terminal two or more hops away.
[0020]
In a network to which the network disconnection prevention method according to the present invention is applied, as shown in FIG. 2, each computer terminal transmits network information of one or more computer terminals ahead of an adjacent computer terminal as advance preparation. The network information signal is obtained from the information management DB of the adjacent computer terminal by the above-mentioned information obtaining means.
[0021]
In the example shown in FIG. 2, in the information management DB 12 of the computer terminal 1, the terminal ID and network information of its own terminal (network information 1), the terminal ID of the Information (network information 2), and a terminal ID and network information (network information 3) of the computer terminal 3 which is one terminal ahead of the adjacent terminal (computer terminal 2) are stored. This information can be obtained by requesting the information from the information acquisition means 11 of the computer terminal 1 to the information management DB 22 of the computer terminal 2.
[0022]
Similarly, information is requested from the information acquisition unit 21 of the computer terminal 2 to the information management DB 32 of the computer terminal 3 and obtained, and the information is requested from the information acquisition unit 31 of the computer terminal 3 to the information management DB 42 of the computer terminal 4. It is possible for each terminal to obtain at least information on the adjacent terminal and the terminal ahead of the terminal by operating the information management DB of each terminal. Is maintained and managed within
[0023]
The above-mentioned operation is indicated by arrows 1A, 2A, 3A, n-1A (the above are information request signals) and 2B, 3B, 4B, nB (these are response signals) in FIG. Have been. The same operation is performed for the other computer terminals connected to the network, and the preparation for the network disconnection preventing operation is completed.
[0024]
Next, an operation performed when an adjacent computer terminal leaves due to a system termination or the like will be described with reference to FIGS. 3 to 5, taking the operation of the computer terminal 1 when the computer terminal 2 leaves the network as an example. .
[0025]
When the adjacent computer terminal 2 is disconnected from the network, the computer terminal 1 detects, for example, that the response between the disconnection detection unit 14 of its own terminal and the disconnection detection unit 24 of the computer terminal 2 has been interrupted (FIG. 3). Inside (1)). This situation is shown in FIG.
[0026]
FIG. 4 shows a case where the signal exchange between the detachment detecting means 14 of the computer terminal 1 and the detachment detecting means 24 of the computer terminal 2 which has been maintained until now (Y in step 51) is interrupted (step 51). At 51), it is detected that the computer terminal 2 has left the network.
[0027]
The computer terminal 1 that has detected the disconnection of the computer terminal 2 from the network releases the connection with the computer terminal 2 by the connection means 13 ((2) in FIG. 3). Next, the connection means 13 of the computer terminal 1 acquires information on the computer terminal 3 (here, the computer terminal 3) two hops away ((3) in FIG. 3). This situation is shown in FIG.
[0028]
The connection means 13 of the computer terminal 1 acquires a network information signal (here, held as the network information 3) of the computer terminal 3 two hops away from the information management DB 12 in the terminal itself (step 60). . The connection unit 13 of the computer terminal 1 that has acquired the network information signal of the computer terminal 3 two hops ahead shifts to the connection to the computer terminal 3.
[0029]
At this time, it is possible to shift directly to the operation of connecting to the computer terminal 3. However, in some cases, the connection from the computer terminal 3 to the own terminal may have already been made. Here, before that, it is checked whether or not the connection from the computer terminal 3 to the own terminal has already been made (step 61 in FIG. 5).
[0030]
As a result of the check in step 61, if the connection from the computer terminal 3 to the own terminal has already been made (the result of the determination in step 61 is Y), the connection operation is not performed and the connection has not been made yet. Only in this case (the result of the determination in step 61 is N), a connection operation to the computer terminal 3 is performed (step 62, (4) in FIG. 3).
[0031]
It should be noted that both in the case where the connection has already been made and in the case where a new connection operation has been performed, in order to monitor the continuation of the connection (that is, the presence or absence of the disconnection), the disconnection detection means 14 uses the computer terminal 3. Is notified to the departure detecting means 14.
[0032]
By a series of operations as described above, even if an adjacent computer terminal leaves the network due to some cause, the network is disconnected by immediately connecting to the computer terminal connected to the adjacent computer terminal. It can be prevented.
[0033]
It should be noted that the above embodiment is merely an example of the present invention, and the present invention is not limited to this, and various changes and improvements are made without departing from the gist of the present invention. Needless to say, it is good.
[0034]
For example, the detection of the presence / absence of a connection with an adjacent computer terminal, as shown in the embodiment, other than the method of periodically exchanging signals for that purpose, monitors the response status of the normally exchanged signals. In advance, a method of detecting the separation of the adjacent terminal based on this situation may be adopted.
[0035]
Further, as described above, before performing the connection operation to the computer terminal ahead of the adjacent computer terminal (that is, the computer terminal two or more hops ahead), it is determined whether the connection has already been made with the computer terminal. It is preferable to check whether this is the case, but this is not essential.
[0036]
Further, as described above, the network disconnection prevention method according to the present invention can be executed by program control by a computer, and the present invention provides a program for this, and a computer-readable program storing this program. It extends to recording media.
[0037]
【The invention's effect】
As described above in detail, according to the present invention, in a peer-to-peer network operation, interruption due to a failure can be automatically prevented, and the effect that management operation can be reduced is remarkable. It is effective.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a P2P network disconnection prevention system.
FIG. 2 is an explanatory diagram of the content of a signal flowing between computer terminals and an acquisition method.
FIG. 3 is an explanatory diagram of a disconnection detection and connection method.
FIG. 4 is a flowchart illustrating a method of detecting separation.
FIG. 5 is a flowchart showing a reconnection method after disconnection.
[Explanation of symbols]
, N Computer terminal N network 11, 21, ..., n1 Information acquisition means 12, 22, ..., n2 Information management DB
121,221,321 Network management information signals 13,23, ..., n3 Connection means 14,24, ..., n4 Departure detection means 51,60-62 Processing steps

Claims (7)

A method for preventing network disconnection in a peer-to-peer (P2P) network in which individual computer terminals are directly connected,
When a computer terminal B adjacent to a certain computer terminal A leaves the network, the computer terminals A, C, D,... After recognizing that we have left the network, we move on to connecting,
A method for preventing disconnection of a network, comprising releasing a connection to the disconnected computer terminal B and directly connecting to a computer terminal two or more hops away. A computer terminal for implementing the network disconnection prevention method according to claim 1,
Information acquisition means capable of acquiring a network management information signal up to a computer terminal at least two hops ahead;
Information management means for holding and managing the acquired network management information signal;
Detecting means for detecting the presence or absence of a connection with another computer terminal;
A computer terminal having connection / disconnection control means. Detection means for detecting the presence or absence of a connection with the other computer terminal,
3. The computer terminal according to claim 2, wherein the terminal periodically transmits the packet to check whether or not there is a response to the packet. Detection means for detecting the presence or absence of a connection with the other computer terminal,
3. The computer terminal according to claim 2, wherein the terminal checks whether or not there is a response in normal information communication. The connection / disconnection control unit includes:
When connecting to a computer terminal two or more hops away,
3. The computer terminal according to claim 2, wherein when the computer terminal has already been connected to the own computer terminal, the connection means is terminated without performing the connection. A program for executing the network disconnection prevention method according to claim 1 under program control by a computer. A non-transitory computer-readable recording medium on which the program for preventing network division according to claim 6 is recorded.

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