JPH01264094A - Decentralized control system for exchange - Google Patents

Abstract

PURPOSE:To apply same structured software to a system diversified in terms of scale and function by adopting the structure able to expand the function and the scale of system in an exchange independently. CONSTITUTION:An inter-sub node coupling device (NCSW) consists of a control signal exchange circuit (C-SW) 201 coupling control signals between sub nodes and a speech signal exchange circuit (U-SW) 202 coupling speech signals. Then sub nodes are classified into high-order sub node group handling control signals 11-13 only and low-order sub node group handling both the control signals 14-16 and a speech signal. The control signal is connected by a control signal coupling interface 31 with the NCSW and the speech signal is connected to the NCSW by a speech signal coupling interface 32. Thus, the software of the same structure is applied to diversified systems.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a distributed control system for responding to expansion of functions and scale in switching equipment, particularly next-generation 15DN switching equipment.

(Prior art) Conventionally, when realizing small to large capacity switching equipment with the same architecture and improving design and development efficiency, Oki Electric Research and Development No. 135 vol. 1.54 A3 r Digital Electronic Switching System - 10X1000ΔI" As shown in the system configuration of PI3 in FIG. 2, a plurality of units capable of accommodating, for example, 1,000 lines were connected by paths for inter-unit communication to increase capacity. The control structure in this case has the form shown in FIG. In other words, each unit is a combination of multiple modules consisting of a group of circuits centered on a lower-level processor that controls the line, and a module consisting of a group of circuits common to the unit centered around a single upper-level processor. However, if you want to expand the system within the number of lines that can be accommodated by one unit, you can do this by adding line-compatible modules, and if you want to expand the system beyond the number of lines that can be accommodated, you can add more units. It takes the form of

Since each unit has the same structure, it is convenient from a hardware perspective, but from a software perspective, the 4th unit has the same structure.
As shown in the figure, in a one-unit system, one
In systems composed of multiple units, cooperative control among multiple processors is now required for a single call processing service. This complicates processing such as management of the connection status between lines that are service targets that should originally be processed centrally.

(Problem to be Solved by the Invention) In a method in which the basic form described above is used as a subsystem and higher-level processors are connected through a network mechanism, the management of the connection state, which should originally be centrally controlled, is handled by the processors on the incoming and outgoing sides of the call. Since the control form in the basic form cannot be maintained, this imposes restrictions on the structure of the call processing program. Furthermore, each subsystem must be functionally homogeneous, making it difficult to expand functionality.

The purpose of this invention is to enable software with the same structure to be applied to systems of various scales and functions by creating a structure that independently allows for functional expansion in exchanges and expansion of system scale. .

(Means and Effects for Solving the Problems) The present invention provides, in an exchange using a storage programmable control system, a control processor that mainly performs closed control to a terminal or trunk, and a group of lower-level processors that perform closed control to terminals or trunks, and connections between the terminals or trunks. The control system is divided into two layers with a group of upper-level processors that control the so-called call processing services related to call processing services, and an inter-processor coupling mechanism is provided that allows control signals to be sent and received between arbitrary processors. It can be executed by the only processor in the upper processor group.

Furthermore, the inter-processor coupling mechanism has a structure that is independent of the coupling mechanism (so-called communication path) for transmitting and receiving call information between terminals or trunks controlled by lower-level processor groups, so that changes in the communication path can be made by the control system and even the communication path. This structure does not require any changes to the software.

(Example) FIG. 1 shows an embodiment of the invention.

In this embodiment, the entire switching system functioning as one system is called a switching node, and the switching node is composed of a group of subnodes shown in 11-16 and an inter-subnode coupling mechanism (NC3W) shown in 2I.

NC3W combines control signals between subnodes;! O
It consists of a control signal switching circuit (C-SW) indicated by I and a speech signal switching circuit (U-8W) indicated by 202 which combines speech signals. The subnodes are classified into upper subnode groups that handle only control signals shown in 11 to 13, and lower subnode groups that handle both control signals and call signals shown in 14 to I6, and for control signals, they communicate with NC3W shown in 3I. The control signal coupling interface connects the call signals to the NC3W by the call signal coupling interface shown at 32. 3I and 32 are system standard interfaces regardless of subsystem differences. The basic form of general call control will be explained below, and then the control method of the call processing service in this embodiment will be described.

FIG. 3 shows the control structure of an exchange centering around one central processing unit, in which a lower processor 402 controls terminals or trunks, and an upper processor 401 performs service control. .

Focusing on one call, for example, in response to a connection request from the terminal 431, the originating terminal control professional Kamihira of 421 calls 402.
431, and receives the telephone number etc. from 431. 42
1 sends the received number to 401 and requests service processing. 401 generates a service control process shown in 411 in response to a service request, and selects the other terminal 4 to be connected.
32 is accommodated and instructs control for the call. The lower processor on the egress side generates the terminating terminal control process 422 in response to the above request and opens the terminating terminal call control.

FIG. 2 shows a control structure of a call processing service in an embodiment of the present invention. In this embodiment, the processor group is connected via a coupling mechanism shown at 503, allowing communication between any processors.

501, 502, 503 in Figure 2 are the third
This corresponds to 11.14.201 in the figure.

The call control operation in this embodiment is as explained in FIG.
401,402,411,421,422,431゜4
32 as 501, 502, 511, 521, 52 respectively
It is exactly the same, just read it as 2°531.532.

The difference between FIG. 3 and FIG. 2 is that in FIG. 3, there is only one destination for the lower processor to send a service request, so there is no need to specify it, but in the embodiment in FIG. 2, the lower processor 5θ2 has a table that specifies higher-level processors for each terminal or trunk accommodated by terminal 531, and sends a service request to 503 by specifying the higher-level processor 501 corresponding to terminal 531 that has issued a connection request.

(Effects of the Invention) As explained above, according to the present invention, innovations in switching technology can be easily incorporated into the system, the influence on software can be localized, and the switching technology developed on the premise that the upper control processor The software can also be applied to switch architectures with multiple control processors.

[Brief explanation of the drawing]

FIG. 1(,)(b) is an explanatory diagram showing the distributed node architecture according to the present invention, FIG. 2 is an explanatory diagram of the inter-processor coupling mechanism in the embodiment of the present invention, and FIG. 3 is an explanatory diagram showing the basic form of call control. Figure 4 is an explanatory diagram showing expansion through networking Patent applicant: Oki Electric Industry Co., Ltd. Figure 1 (○) Figure 3 is an explanatory diagram showing the basic form of call control

Claims (1)

[Claims] A system comprising a plurality of blocks centered around one control processor including a group of peripheral circuits to be controlled by the control processor, and a mechanism for connecting these plurality of blocks, and using a plurality of control processors. In a storage program control type exchange, a mechanism for connecting control signals between processors and a mechanism for connecting communication information between subscribers are configured separately, and a coupling mechanism that enables communication between arbitrary processors is provided. At the same time, it has a hierarchical control structure consisting of lower-level control that is closed to terminals or trunks, and higher-level control that controls the mutual connection status of terminals or trunks and executes exchange services, and has a layered control structure that includes lower-level control that is closed to terminals or trunks, and upper-level control that controls the mutual connection status of terminals or trunks and executes exchange services. A distributed control system for switching equipment, characterized in that control can be executed by a single processor.