JPH04144448A - Distribution type packet exchange - Google Patents

Abstract

PURPOSE:To prevent a call from being disconnected by substituting a communication control module (CCM) capable of substituting communication because of the generation of extra load in the CCM out of plural CCMs other than a calling CCM generated within a fixed time for a calling packet exchanging function. CONSTITUTION:When the load of a CCM 21 is congested, the CCM 21 receiving a call request P1 transmitted from a call terminal 51 sends a substitution request signal S10 to a call storing module 30. The module 30 temporarily stores the call request in a queue 70, sets up a substitution queuing time T1 and waits until another CCM is turned to a substitution enabled state. When the load of a CCM 23 is reduced less than a previously determined substitution enabled reference value and turned to a substitution enabled state, the CCM 23 sends a substitution instruction request signal S11 to the module 30. Thus, a call is prevented from being disconnected.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Applications] The present invention relates to a packet switching device, in particular, to a distributed device that connects a plurality of communication control modules accommodating terminals via a common bus and distributes packet switching processing. related to type packet switching equipment.

[Conventional technology]

Conventionally, once a distributed packet switch receives a call request from a terminal, the subsequent call processing operations such as connection completion, data transfer, and disconnection all increase the load. Each communication control module monitors its own operating state, and if it detects a nuisance state, it will monitor newly received calls from its own accommodation terminal as a first step to prevent an increase in load until the state is cleared. The system was such that requests were not accepted.

[Problem to be solved by the invention]

In the conventional distributed packet switching equipment described above, when an individual communication control module becomes overloaded, even if other communication control modules can handle the load at that time, new communication control modules that cannot be handled by the own communication control module are generated. Since not all call requests are accepted, the only way to allow more call connections is to improve the capabilities of each communication control module itself, making the system as a whole extremely expensive. There was a problem with this.

An object of the present invention is to include a call storage module that requests a proxy module to process a call made by a communication control module in a congested state, and to request a communication control module with sufficient load to process the call as a proxy module. The object of the present invention is to provide a distributed packet switch that solves the above problems.

[Means to solve the problem]

The basic configuration of the distributed packet switching device according to the present invention is a distributed packet switching system that connects multiple communication control modules accommodating terminals via a common bus, and transmits and receives call control signals between the originating and receiving communication control modules to realize switching functions. A communication control module that can act on behalf of a call request in the exchange 1. - a call storage module that instructs one of the terminals to act on behalf of the terminal; when the communication control module receives a call request from a terminal with a load greater than a predetermined congestion reference value, the communication control module instructs one of the terminals to act on behalf of the call storage module; At the same time, in a state where the load is less than a predetermined width edge reference value (representation possible reference value) (representation possible state), a request is made to the calling storage module to request a substitution instruction, and when the substitution is instructed, a substitution instruction is requested. (Instead of the other communication control module, it transmits and receives call control signals to and from the incoming communication control module, and also transfers packets to and from the calling terminal via the calling communication control module.

One specific configuration of the call storage module described in the above basic configuration has a time limit monitoring function, and after being requested to act on behalf of a communication control module, no other communication control module requests an instruction to act on its behalf within a predetermined time period. At that time, the communication control module, which had requested a proxy, sent a message saying that the proxy could not be substituted.
The module requested to act as a substitute has a time limit monitoring function, and requests a substitute instruction to the call storage module at predetermined time intervals while the substitute is possible.

Further, one specific configuration of the communication control module described in the above basic configuration includes a time-limited monitoring function, and measures the load condition every predetermined time period, and generates IS when the state of the load exceeds a predetermined congestion reference value. , and the occurrence of a substitutable state when the substitutable state is less than or equal to a predetermined substitutable reference value.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of a distributed packet switching device showing an embodiment of the present invention, and FIG. 2 shows packets when a communication control module receives a call request in a normal state, showing an embodiment of the present invention. A sequence diagram illustrating an example of an exchange operation and an operation example when a call request stored for more than a certain period of time is returned to the storage source communication control module to establish a call connection when there is no communication control module in a state where it can be substituted. , FIG. 3 shows that after the present invention enters the light chain state and stores the call request in the call storage module, another communication control module becomes ready to take over the call request and performs the packet switching function. FIG. 3 is a sequence diagram showing an example of an operation performed on behalf of the user;

First, the configuration will be explained with reference to FIG. The distributed packet switch io has a plurality of communication control modules 20 connected to a common bus 40 and one call storage module 30 inside the device. The communication control module 20 is connected to the subscriber a60 and to the terminal 50.

The communication control module 20 monitors the load state and detects a state of imbalance above a predetermined convergence reference value μ, a congestion detection unit 80;
and a substitutable detection unit 90 that detects a predetermined @proboscis reference value (substitutable reference value) or less as a substitutable state.

The outgoing call storage module 30 has a key 70 for storing incoming outgoing calls in columns in a first-in, first-out (FIFO) format until they can no longer be substituted.

Next, the processing procedure for a call request will be explained with reference to FIGS. 2 and 3 together with FIG. 1.

Here, the communication control module 20 in FIG.
is classified into calling terminal 51 and called terminal 52.

First, when the communication control module 21 is in a normal state, the communication control module 2 receives the call request PL sent from the calling terminal 51, performs the calling process, and then A call connection signal 81 is sent to the communication control module 22 accommodating the call terminal 52, and the call connection signal Sl
The communication control module 22 that received the received call P2 transmits the received call P2 to the called terminal 52. Next, the response P3 sent from the called terminal 52 is converted into a connection completion signal S2 by the communication control module 22, and sent to the communication control module 21.
The communication control module 21 converts it into a connection completion P4 and sends it to the calling terminal 51. Thereafter, the data P5 transmitted by the calling terminal 51 is received by the communication control module 21, and after data transfer processing is performed, it is converted into a data signal S3 and sent to the communication control module 22, where the data P6
and is transmitted to the called terminal 52. Calling terminal 51
When disconnecting the call, the disconnection request P7 is received by the communication control module 21, and after performing disconnection processing, a disconnection signal S4 is sent.
The communication control module 22 converts it into a disconnection instruction P8 and sends it to the terminal 52 to complete the call disconnection.

In addition, when the load on the communication control module 21 exceeds a predetermined congestion reference value and falls into a congestion state, the communication control module 21 that has received the call request Pl transmitted from the calling terminal 51 stores the call A proxy request signal 810 is sent to the module 30. The call storage module 30 that receives the storage request signal 810 stores the call request in the queue 70.
, and sets a proxy waiting time limit TI to wait for a proxy request signal S11 from another communication control module.

If none of the communication control modules becomes available for substitution, the call storage module 30 sends a substitution disable signal S14 to the communication control module 21, and the communication control module 2f receives the substitution disable signal 814. A disconnection instruction P8 is sent to the calling terminal 51 to reject the connection of the call.

Next, as shown in FIG. 3, when the load on the communication control module 21 exceeds a predetermined congestion reference value and falls into a congested state, the communication that received the call request P1 transmitted from the calling terminal 51 The fu control module sends a proxy request signal SlO to the call storage module 30. Upon receiving the proxy request signal 810, the call storage module 30 temporarily stores 70 call requests in the key 70, and waits for the proxy waiting time T.
1 and waits until another communication control module becomes ready to take over.

When the load on the communication control module 23 falls below a predetermined reference value to allow substitution, the communication control module 23 sends a substitution instruction request signal S11 to the call storage module 30, and requests other communications. The control module accepts: requests to take over the outgoing call request; Upon receiving the proxy instruction request signal Sll, the call storage module 30 retrieves the call request previously stored in key -70 in response to a request from the communication control module 21, and releases the proxy time limit 'r1. After that, as a proxy instruction signal 812, the first control module is sent, -
23. Receiving the proxy instruction signal 812, the tracing control module 23 sends the proxy notification signal 813 at (-7) to the communication control module 21, which is a storage light, and at the same time performs outgoing processing to send the called terminal 52 at the destination. A call connection signal S1 is sent to the communication control process 22 accommodated therein.

The communication control module 22 that has received the call connection signal S1 transmits an incoming call P2 to the incoming terminal 52.

Next, the response P3 transmitted from the called terminal 52 is converted into a completion signal S2 by the communication control module 22, and sent to the control module 23, and the received signal is sent to the control module 23. Connection completed Converted to PIO and communication control module. 2I and is transmitted to the calling terminal 51 as a connection completion P4. Thereafter, the data P! transmitted by the calling terminal 51! 1mA faith tl? 1J control module 21 and is transferred to the communication control module 23 as data pH, and after data transfer processing is performed, it is converted into a data signal S3 and sent to the music signal control module 22. is converted into data P6 and sent to the called terminal 52.
sent to. When the calling terminal 5I disconnects the call, the disconnection request P7 passes through the communication control module 21 and is transferred as a disconnection request P12 to the communication control module 23, and after performing disconnection processing, the communication control module 23 issues a disconnection signal S.
4 and sent to the communication control module 22, where the communication control module 22 converts it into a disconnection instruction P8 and sends it to the called terminal 52, completing the disconnection.

Next, referring to FIGS. 4 and 5 together with FIG. 1, the operation of the communication control module 2o and the call storage module 3 will be described.
The operation of 0 will be explained.

FIG. 4 is a flowchart of the operating procedure of the communication control module of the present invention, and FIG. 5 is a flowchart of the operating procedure of the call storage module of the present invention, based on the examples of FIGS. 2 and 3, respectively. .

As shown in FIG. 4, when the communication control module 20 receives a call request P1 from the terminal 50 it accommodates (101), it becomes the communication control module 21 on the calling side, and the congestion state (
102), that is, normally, the call connection signal S1
is transmitted to the destination communication control module 22 (103). Next, the communication control module 21 receives the connection completion signal S2 from the called side (104), converts it into a connection completion signal P4, and transmits it to the calling terminal 51 (105). As a result of this step 105, the communication control module 21
Since data P5 is received from the terminal, a data signal S3 obtained by converting this data P5 is transmitted to the receiving side (106). Next, the communication control module 21 receives a disconnection request P7 from the calling terminal 51 (108), so it transmits a disconnection signal S4 to the called party (109) and ends the procedure.

If there is a congestion state in step 1.02, the communication control module 21 that has received the call request PI transmits a proxy request signal SlO to the call storage module 30 (111) and waits for a proxy notification signal. The communication control module 21 that has received the proxy notification signal (112) then sends the connection completion PLO received from the proxy communication control module 23 to the calling terminal 51 (connection completion P4).
It is sent and transferred as is (113). Next, the communication control module 21 transfers both the data P5 and the disconnection request P7 received from the calling terminal 5I as the data pH and the disconnection request P12 (114 and 115), respectively.

In step 112, the substitution not possible signal 814 is sent instead of the substitution notification signal.
When receiving (116), the IJJ control module 21 transmits a disconnection instruction P8 to the calling terminal 51 (117).
)l, to end the procedure.

When the communication control module 20 becomes ready for substitution (
121), as the proxy communication control module 23, transmits a proxy instruction request signal S11 to the call receiving module 3o (
122) Do. The communication 1IllJ control module 23, which has received the proxy instruction signal 812 (123) from the call storage module 3o through this step 122, transmits the proxy notification signal 813 to the calling side I cell phone control module (124), and also From step 103 to step 109, the same procedure as that of the communication control module 21 on the originating side is performed.

Next, as shown in FIG. 5, the call storage module 30 receives a proxy request signal 81 from the communication control module 21 on the calling side.
0, in order to wait for the proxy instruction request signal S11 from the proxy communication control module 23, the call is recorded and stored in the key 70 (201), and the measurement of the proxy waiting time TI is started (202/). Exceeding time limit TI (203)
When previously receiving the proxy instruction request signal 811 (204), the calling storage module 30 transmits the proxy instruction signal 812 to the communication control module 23, and also sends the proxy instruction signal 812 to the communication control module 23.
Delete the call record that has accumulated to 0 and is waiting for a proxy (205).

When the time limit TI is exceeded in step 203, the call storage module 30 transmits a proxy disable signal 814 to the communication control module 21 on the calling side (211).

The call storage module sequentially stores each agency request signal received in the calling key, and retrieves the first call that was placed first, and transmits the agency instruction signal following the reception of the agency instruction request signal, or sends the agency request signal. Sequential deletion from the queue by sending a disapproval signal.

The light chain state or substitutable state of the communication control module may be determined by continuous monitoring of the load of its own module, or may be monitored at fixed intervals.

The proxy communication control module transmits a proxy instruction request signal at regular intervals when the proxy possible state occurs and there is no proxy waiting in the call storage module, and when the proxy instruction signal is received, the proxy communication control module sends a proxy instruction request signal. If the substitution enabled state continues after the substitution call processing is completed, the substitution instruction request signal may be immediately transmitted.

Therefore, the timing of monitoring the load on the communication control module and transmitting the proxy instruction request signal is not limited to the above description.

〔Effect of the invention〕

As explained above, the distributed packet switch according to the present invention has a call storage module connected to a common bus within the device, and the communication control module in a light chain state communicates via the call storage module. The configuration is such that call processing is entrusted to a communication control module that is in a state where it can take over, so that even if one communication control module falls into a light chain state, at least one of the other communication control modules will have a surplus load within a certain period of time. If communication proxy becomes possible, by having this communication control module perform the packet switching function for this call, communication services will be provided without disconnecting the call.
As a result, the capabilities of all communication control modules within the device can be used effectively and evenly, and an economical packet switch can be constructed in which the capabilities of each communication control module are kept relatively small.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of a distributed packet switch showing an embodiment of the present invention, and FIG.
Packet switching operation when the communication control module receives a call request in a normal state, and when the communication control module is in a light chain state and stores a call request in the call storage module, and there is no communication control module in a state that can be substituted. Fig. 3 is a sequence diagram when a call request stored for more than a certain period of time is returned to the storage source communication control module to refuse the call connection. 4 is a sequence diagram showing the operation of accepting the call request and acting on behalf of the packet switching function; FIGS. 4 and 5 are the communication control module and call storage module in FIGS. 2 and 3, respectively; FIG. It is a flowchart which shows an example of each operation procedure. 10...Distributed packet switch, 20,21゜22.23...Communication control module, 30...
...Call storage module, 40...Common bus, 50,51゜52...Terminal, 60...
...Subscriber line, 70...Key agent Patent attorney
Susumu Uchihara

Claims (1)

[Scope of Claims] 1. A distributed packet switch that connects a plurality of communication control modules accommodating terminals via a common bus and transmits and receives call control signals between the originating and terminating communication control modules to realize a switching function. A call storage module is provided which receives a request to act on behalf of the call request and instructs one of the communication control modules capable of acting on the behalf, and the communication control module does not make the call request in a state where the load is equal to or higher than a predetermined congestion reference value. While requesting the call storage module to act on behalf of the call storage module when received from the terminal,
In a state where the load is below a predetermined congestion reference value (representation enablement reference value) (representation enabled state), a proxy instruction is requested to the calling storage module, and when the proxy is instructed, the communication control module that requested the proxy is substituted. 1. A distributed packet switching system characterized by transmitting and receiving call control signals to and from an incoming communication control module and transferring packets to and from a calling terminal via the calling communication control module. 2. The call storage module according to claim 1 has a time limit monitoring function, and when the communication control module does not request a proxy instruction from another communication control module within a predetermined time period after the communication control module requests the proxy request. The communication control module according to claim 1, wherein the communication control module according to claim 1 has a time limit monitoring function. 2. The distributed packet switching device according to claim 1, further comprising: requesting a proxy instruction to a call storage module at predetermined time intervals while a proxy enable state occurs. 3. The communication control module according to claim 1 has a time-limited monitoring function, and can measure the state of the load every time a predetermined time elapses, and when the state of the load is equal to or higher than a predetermined congestion reference value, can cause congestion to occur, or can act on a predetermined basis. 2. The distributed packet switching system according to claim 1, wherein the occurrence of the substitution enabled state is detected when the threshold value is less than or equal to a reference value.