JPH05183580A - Distributed packet exchange - Google Patents

Abstract

PURPOSE:To uniformize the load of plural communication control modules connected to a common bus and to avoid interruption of a new call request as less as possible. CONSTITUTION:Plural communication control modules 121-124 connecting to a common bus 11 are paired 15, 16. One of the pair 15, 16 manages contract information of terminal equipments accommodated to the other mutually. When the one of the pairs is congestion, it is informed to the other and when the other is not in congestion, the call processing is substituted by the other. Thus, so long as both communication control modules in pairs are not in congestion, the call a prescribed is available.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet switch, and more particularly to a distributed packet switch in which a plurality of communication control modules are connected by a common bus to perform packet switch processing in a distributed manner.

[0002]

2. Description of the Related Art In a packet switch, once a call request is received from a terminal, connection completion, data transfer, disconnection and subsequent call processing operations all become factors that increase the load. Therefore, in a distributed packet switching system that performs packet switching processing in a distributed manner, each communication control module connected to the common bus monitors its own operating status, and when a congestion status is detected, it is released. Until that time, all of them were disconnected without accepting the new call request received from their own terminal. This was the first step to prevent an increase in load.

[0003]

As described above, in the conventional distributed packet switch, all new call requests that cannot be processed by the own communication control module are disconnected. Therefore, it has been necessary to improve the capability of each communication control module in order to enable more call connections. However, there is a problem that a measure for preventing overload by improving the capability itself of the communication control module makes the price of the entire system very expensive.

Therefore, an object of the present invention is to allow a call processing operation of a communication control module having a small load to be substituted if there is a load having a large load among a plurality of communication control modules connected to a common bus. It is an object of the present invention to provide a distributed packet switch that can balance loads and eliminate the situation of disconnecting a new call request as much as possible.

[0005]

According to a first aspect of the present invention, two pairs are paired with each other, and one of the pairs manages contract information of terminals which the other accommodates. A distributed packet switch is configured by connecting a plurality of communication control modules that perform call processing operations to a common bus.

That is, according to the first aspect of the present invention, two communication control modules connected to the common bus are paired to form a pair, and one of the pair manages the contract information of the terminals which the other accommodates and manages the predetermined information. In this case, the call processing operation of the other party of the pair is performed instead, and the load is averaged between the two communication control modules to achieve the above-mentioned object.

According to a second aspect of the present invention, each communication control module according to the first aspect monitors the load of its own communication control module at regular intervals, and the load is predetermined as a result of the monitoring of this monitor means. If it is equal to or greater than the congestion reference value, a notification means for notifying this to the other communication control module in the pair, and a determination to determine whether the load of the other communication control module in the pair is equal to or greater than the congestion reference value And the determination means determines that the load of the other communication control module is less than the congestion reference value, the call request of the terminal accommodated by itself and subsequent packets relating to these calls are transmitted to the other communication control module. And a terminal accommodated in the communication control module when a call request is transferred from one of the paired communication control modules. Are to be provided with a proxy means it analyzes a call request, to act for the subsequent call processing operation in accordance with contract information.

That is, in the distributed packet switch according to the present invention, each communication control module monitors the presence / absence of its own congestion state, and determines the presence / absence of the congestion state of the other communication control module in the pair, When the other is in a congestion state and the other is in a normal state other than this, the call request to itself and the subsequent call processing related to this call are delegated to the other side of the pair to achieve the above-mentioned object.

According to the third aspect of the present invention, the call request from the terminal accommodated by itself is rejected only when the paired self and the other two communication control modules are in a congestion state.

[0010]

EXAMPLES The present invention will be described in detail below with reference to examples.

FIG. 1 shows the configuration of a distributed packet switch according to an embodiment of the present invention. The distributed packet switch 10 has four communication control modules 12 _{1 to} 12 ₄ connected to its common bus 11. Of these, the first communication control module 12 ₁ is connected to the terminal 13, and the fourth communication control module 12 ₄ is connected to another terminal 14.

First communication control module 12₁And the second
Communication control module 12₂Is the relationship of pair 15 in advance
Is set to. Third communication control module 12₃When
Fourth communication control module 12_FourAlso pair 16 in advance
Has been set to the relationship. Assemble these pairs 15 and 16
2 communication control modules (12₁, 12₂),
(12₃, 12_Four) Is the phase formed by pairing 15 and 16 with each other
It manages the contract information of the handheld terminals. Sanawa
The contract information 17 of the terminal 13 is the first communication control module.
Rule 12₁Not only is it managed by the second communication control
Module 12 ₂But it is managed.

The distributed packet switch 1 having such a configuration
0, for example, the first communication control module 12 ₁ is not in a congestion state (hereinafter referred to as a normal state). In this case, the call request received from the terminal 13 is analyzed by the first communication control module 12 ₁ according to the contract information 17. Then, it is transmitted to the _third communication control module 12 ₃ of the destination through the common bus 11, and the terminal 1 receives the incoming call.
4 is transmitted. This is shown as a call request flow 21 in FIG.

Next, consider a case where the position of the first communication control module 12 is in the congestion state and the second communication control module 12 ₂ forming the pair 15 is in the normal state. In this case, the call request received from the terminal 13 is directly transferred to the _second communication control module 12 ₂ , and the contract information 17
Is analyzed according to. Then, it is transmitted to the _third communication control module 12 ₃ of the destination through the common bus 11,
It is transmitted to the terminal 14 as an incoming call. This is shown as a call request flow 22 in FIG.

Next, the operation of the distributed packet switch in each state of the communication control module will be described with reference to FIGS. 1 and 2 to 5.

FIG. 2 shows that, when the first and second communication control modules 12 ₁ and 12 ₂ forming the pair 15 are both performing the call processing operation in the normal state, the first communication control module 12 is started from a certain point. ₁ represents the operation in the case of congestion.

When the first communication control module 12 ₁ is still in the normal state, the call request P ₁ received from the terminal 13
Are analyzed in the first communication control module 12 ₁ . Then, it is transmitted as a call connection signal S ₁ to the third communication control module 12 ₃ of the destination, and further, the incoming call P
Sent as ₂ . Next, the response P ₃ received from the receiving terminal 14 is transmitted to the first communication control module 12 ₁ as the connection completion signal S ₂ by the third communication control module 12 ₃ , and the connection completion P is sent to the calling terminal 13. Sent as ₄ .

After that, the data P received from the terminal 13_Five
Is the first communication control module 12 ₁With the data signal S₃
As the third communication control module 12₃Sent to
Data P₆Is transmitted to the terminal 14. Furthermore, the terminal
Disconnection request P received from 13 ₇Is the first communication control module
Tulle 12₁Disconnect signal S_FourAs the third communication control module
Tulle 12₃To the disconnection instruction P₈As a terminal
14 is sent to complete the call disconnection.

At some point, the first communication control module 1
It is assumed that the load of 2 ₁ exceeds a predetermined congestion reference value and becomes a congestion state. First communication control module 1
The 2 ₁ sends a congestion notification signal S ₁₀ to the second communication control module 12 ₂ of the other party forming the pair 15 to notify that it is in the congestion state.

After that, the calling request P received from the terminal 13
₁ is directly transferred second communication control module 12 _2, are analyzed in the second communication control module 12 _2.
Then, it is transmitted as a call connection signal S ₁ to the third communication control module 12 ₃ of the destination, and is further transmitted to the terminal 14 as an incoming call P ₂ . At the same time, the second communication control module 1
2 ₂ receives subsequent response P ₃ for the call, data P
_{5 When} receiving the reception / disconnection request P ₇ , all the call processing operations that the first communication control module 12 ₁ should originally perform are performed.

FIG. 3 shows the first communication control module 12 ₁
Shows the operation when the congestion state is released. It is assumed that the load of the first communication control module 12 ₁ falls below a predetermined congestion reference value and the congestion state is released. At this point, the first communication control module 12 ₁ sends the congestion release notification signal S ₁₁ to the second communication control module 12 ₂ forming the pair 15 to notify that the congestion state of itself has been released. To do.

Thereafter, the calling request P received from the terminal 13
₁Is the first communication control module 12 ₁Analyzed in the call
Continued signal S₁Third communication control module 1 of the destination
Two₃Sent to P and₂Sent to terminal 14 as
Be done. At the same time, the call processing operation for the call is the first communication control.
Module 12₁Will be realized in. Figure 2
Since it has been described above, the description will be omitted.

FIG. 4 shows the operation when both of the _two communication control modules 12 ₁ and 12 ₂ forming the pair 15 are in a congestion state. It is assumed that when the first communication control module 12 ₁ is in the normal state, the load of the second communication control module 12 ₂ exceeds the predetermined congestion reference value and is in the congestion state. In this case, the second communication control module 12 ₂ sends the congestion notification signal S to the _first communication control module 12 ₁ of the other party forming the pair 15.
Send ₁₀ to notify itself that it has become congested. At this time, when the first communication control module 12 ₁ is also in the congestion state, the first communication control module 12 ₁ also transmits the congestion notification signal S ₁₀ to the second communication control module 12 ₂ forming the pair 15. Then, it notifies itself that it has become congested.

After this, the calling request P received from the terminal 13
₁ is rejected for call connection. This is because the first communication control module 12 ₁ and the second communication control module 1 1
This is because both 2 and ₂ recognize that they are in a congestion state. Therefore, the first communication control module 12 ₁ will send the disconnection instruction P ₈ to the terminal 13.

FIG. 5 shows a case where one communication control module forming a pair is in a congested state and is requesting the other communication control module to act on behalf of the other communication control module. This is an operation. It is assumed that the load of the first communication control module 12 ₁ exceeds a predetermined congestion reference value and a congestion state occurs. In this case, the first communication control module 12 ₁ is the second communication control module 12 of the other party who has formed the pair 15.
_A congestion notification signal S ₁₀ is transmitted to ₂ to notify that it is in a congestion state.

After that, the calling request P received from the terminal 13
_{The 1} is transferred to the second communication control module 12 ₂ as it is, and is analyzed here. Then, it is transmitted as a call connection signal S ₁ to the third communication control module 12 ₃ of the destination,
Further, the incoming call P ₂ is transmitted to the terminal 14. Second at the same time
The communication control module 12 ₂ of (1) substitutes all the call processing operations that the _first communication control module 12 ₁ should originally perform when the subsequent response P _{3 is} received, the data P _{5 is} received, and the disconnection request P _{7 is} received.

Further, the second communication control module 12 acting on behalf of the call processing operation of the _first communication control module 12 _1.
Suppose ₂ becomes congested. In this case, the second communication control module 12 ₂ is the first communication control module 12 ₁
A congestion notification signal S ₁₀ is transmitted to the device to notify that the device itself is in a congestion state.

Thereafter, the call request P received from the terminal 13
₁ is refused the call connection by the _first communication control module 12 ₁ . This is because the first communication control module 12 ₁ recognizes that both itself and the second communication control module 12 ₂ are in a congestion state. So first
The communication control module 12 ₁ will send the disconnection instruction P ₈ to the terminal 13.

[0029]

As described above, according to the invention described in claim 1, as in the case where a plurality of communication control modules connected to the common bus form a pair, and one of them is in a congestion state. The other side performs the call processing operation in a predetermined case. Therefore, it is possible to realize an economical distributed packet switch in which the capacity of each communication control module is suppressed to a relatively small one.

Further, according to the second aspect of the present invention, if the communication control module of the other party forming a pair is in a normal state, the call request received from the terminal accommodated in the communication control module in the congested state is transmitted to the other party. Since the call can be transferred to the communication control module and requested to perform the call processing operation, the communication service can be continued without disconnection.

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of a distributed packet switch according to an embodiment of the present invention.

FIG. 2 is an explanatory sequence diagram showing an operation of the distributed packet switch when one of the two communication control modules paired in this embodiment enters a congestion state from a predetermined time point.

FIG. 3 is a sequence explanatory diagram showing an operation of the distributed packet switch when one communication control module is released from a congestion state in the present embodiment.

FIG. 4 is a sequence explanatory diagram showing an operation of the distributed packet switching system when two communication control modules paired in this embodiment are both in a congestion state.

FIG. 5: When one communication control module paired in this embodiment is in a congestion state and is requesting the other communication control module to act on its behalf, the other communication control module is also in a congestion state It is a sequence explanatory view showing operation in the case.

[Explanation of symbols]

10 distributed packet switch 11 common bus 12 _{1 to} 12 ₄ communication control module 13, 14 terminal 15, 16 pair

Claims (3)

[Claims] 1. A common bus and a pair of two buses connected to this common bus,
A distributed type characterized by comprising a plurality of communication control modules in which one of the pair manages contract information of terminals accommodated in the other of the other and, in a predetermined case, substitutes the call processing operation of the other party of the pair. Packet switch. 2. Each of the communication control modules, monitoring means for monitoring the load of its own communication control module at regular intervals, if the load as a result of the monitoring of this monitoring means is equal to or more than a predetermined congestion reference value, a pair is formed. Notifying means for notifying this to the other communication control module that has been assembled, determination means for determining whether the load of the other communication control module that has been paired is greater than or equal to the congestion reference value, and this determination means is the other When it is determined that the load of the communication control module of is less than the congestion reference value, the call origination request of the terminal accommodated by itself and the transfer means for transferring the subsequent packets related to these calls to the other communication control module are paired. When a call request is transferred from one of the communication control modules that have been assembled, a call request is made according to the contract information of the terminal accommodated in that communication control module. Analyzed, distributed packet switch according to claim 1, characterized by comprising a substituting means for substituting the subsequent call processing operations. 3. In each of the communication control modules, the load is equal to or larger than a predetermined congestion reference value as a result of the monitoring by the monitoring means, and the load of the other communication control module paired by the judging means is also congested. 3. The distributed packet switch according to claim 2, further comprising call origination request rejecting means for rejecting a call origination request of a terminal accommodated therein when it is determined to be equal to or larger than a reference value.