JP2570744B2 - Inter-station communication control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to an interoffice communication system in which an exchange integrating circuit switching and packet switching functions communicates with a partner station on a trunk line. The present invention relates to an inter-station communication control method capable of promoting unification of communication procedures and simplifying hardware and software.

(Prior art)

For the conventional inter-station communication system of a circuit switch, for example,
The No. 7 communication system has been adopted, and the inter-station communication system of the packet switch employs different systems such as, for example, an X.25. Similar communication system. For this reason, the frame format, communication means, and the like are completely different.

[Problems to be solved by the invention]

In the above-mentioned conventional technology, when configuring an exchange integrating circuit switching and packet switching functions, it is necessary to support a plurality of communication systems, and there is a problem that hardware and software are complicated.

An object of the present invention is to improve such a problem and configure an exchange integrating circuit switching and packet switching.
By multiplexing the packet switching circuit call control signal and communication information such as management and operation between the two-station switching processors on the packet relay line, and unifying the communication procedure at least up to layer 2 (frame level). Another object of the present invention is to provide an inter-station communication control system capable of simplifying hardware and software related to inter-station communication and configuring a highly economical system.

[Means for solving the problem]

An object of the present invention is to provide a circuit switching terminal for converting only a circuit switching call control signal of call information from a circuit switching terminal into a packet form in an integrated exchange having a circuit switching and packet switching inter-station communication control function. An interface control means, a packet switching terminal interface control means for terminating a packet exchange packet from a packet switching terminal, a packet relay line interface control means for terminating a packet transmitted and received between stations, A buffer for a common packet for temporarily storing the call control signal for line conversion and the packet for packet switching, the line terminal interface control means, the packet switching terminal interface control means, the packet relay line interface control means, and the common packet buffer. Packet to / from buffer And means for controlling the input and output,
An inter-station communication control method, wherein the circuit switching call control signal converted into the packet form and the packet switching packet are packet-multiplexed using the same packet relay line and communicated with a partner exchange. Achieved by

[Action]

In the inter-station communication control method according to the present invention, a circuit switching terminal interface (hereinafter abbreviated as a CS terminal interface) transmits a CS call control signal from a CS terminal to a control signal packet assembling / disassembling mechanism (hereinafter referred to as a control signal PAD). (Abbreviated) and output to the common packet buffer.

In addition, the packet switching terminal interface (hereinafter abbreviated as PS terminal interface) has a
A flag (hereinafter abbreviated as F), an address field (hereinafter abbreviated as A), a control field (hereinafter abbreviated as C), and a frame check sequence (hereinafter abbreviated as FCS) are deleted from the packet from the terminal, Output to common packet buffer.

Further, the processor has an input / output control program (hereinafter referred to as IO
CS), and the inter-processor communication packet is output to the common packet buffer by the layer program.

The trunk line interface for packets assigns FA, C, and FCS to each packet stored in the common packet buffer.
To perform layer 2 communication with the partner station.

〔Example〕

 Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a block diagram of an integrated exchange according to a first embodiment of the present invention, and FIG. 4 is a flowchart of packet multiplexing in the first embodiment of the present invention.

As shown in FIG. 1, the integrated exchange of this embodiment comprises a CS terminal interface 1, a PS terminal interface 2, a packet trunk line interface 3, a common packet buffer 4 installed in main storage, an IOCS 5, an upper layer program 6 , And a processor 7.

The CS terminal interface 1 includes a control signal PAD 11, the PS terminal interface 2 includes a layer 2 termination mechanism 21, and the packet trunk line interface 3 includes a layer 2
A termination mechanism 31 is provided.

The common packet buffer 4 is installed in the main memory,
Reference numeral 5 controls data input / output between the CS terminal interface 1, the PS terminal interface 2, the trunk line interface 3 for packets, and the common packet buffer 4.

The transmission / reception control by the IOCS5 is the same as the technique disclosed in the “signal processing method” filed on May 15, 1987.

The upper layer program 6 implements communication means of layer 3 or more with various terminals and partner stations.

The processor 7 executes the IOCS 5 and the upper layer program 6, and manages and manages the entire system.
For supervision, it requests the IOCS 5 and the layer program 6 for packet communication for exchange information with the partner station processor.

In the integrated exchange having such a configuration, when receiving data from a terminal and transmitting the data to a trunk line, as shown in FIG. 4, the CS terminal interface 1 passes only a control signal from the terminal to the PAD 11, and the PAD 11 The communication is packetized and output to the common packet buffer 4 (401).

On the other hand, the PS terminal interface 2 processes the packet from the PS terminal by using the layer 2 termination mechanism 21 according to a layer 2 communication procedure such as a high-level data link transmission control procedure (HDLC). C and FCS are deleted and output to the common packet buffer 4.

In addition, the processor 7 causes the inter-processor communication packet to be output to the common packet buffer 4 by the IOCS 5 and the upper layer program 6.

Thus, the CS call control signal packet, the PS packet, and the inter-processor communication packet are stored in the common packet buffer 4 (402).

Furthermore, the packet relay line interface 3 inputs various packets in the common packet buffer 4 one by one, and uses the layer 2 termination mechanism 31 to output F, A, C,
The addition of the FCS and the layer 2 communication procedure processing are executed by, for example, the same HDLC as the layer 2 terminating mechanism 21, and the layer 2 communication with the partner station is performed (403).

When data is transmitted to the terminal, a process that is basically the reverse of these procedures is performed.

In addition, complete communication with various terminals and partner stations is performed by the upper layer program 6 through each interface 1 to 3.
3, the common packet buffer 4 and the control of the IOCS5. When handling the packets of each of the interfaces 1 to 3, the layer program 6 controls the PAD 11 for the control signal depending on the application and the status of the terminal used.
It is also possible to provide a separate procedure in conjunction with the function of the related hardware such as.

Further, when performing packet communication for exchange information with the partner station processor, the processor 7 can access any position in the common packet buffer 4 by an instruction.
Except for transfer of exchange information between the packet relay line interface 3 and the common packet buffer 4, control by the IOSS 5 is unnecessary.

FIG. 2 is a block diagram of an integrated exchange according to a second embodiment of the present invention, and FIG. 3 is a terminal according to the second embodiment of the present invention.
FIG. 9 is an explanatory diagram showing the differences between the IOCS and the inter-station IOCS, and the functions of the terminal upper layer program and the inter-station upper layer program.

As shown in FIG. 2, the integrated exchange of this embodiment comprises a CS terminal interface 1, a PS terminal interface 2, a packet trunk line interface 3, a common packet buffer 4,
Terminal IOCS501, inter-station IOCS502, terminal upper layer program
601, an inter-station upper layer program 602, and a processor 7.

The CS terminal interface 1 includes a control signal PAD 11, the PS terminal interface 2 includes a layer 2 termination mechanism 21, and the packet trunk line interface 3 includes a layer 2
A termination mechanism 31 is provided.

The terminal IOCS501 controls data input / output between each of the terminal interfaces 1 to 3 and the common packet buffer 4.
It has the same function as IOCS5 in the first embodiment. However, control regarding the packet relay line interface 3 is not performed, and the control is performed by the inter-station IOCS 502.

The terminal upper layer program 601 has the same functions as those of the upper layer program 6 in the first embodiment with respect to each of the terminal interfaces 1 to 3, but does not perform the processing related to the packet relay circuit interface 3.
Note that this processing is performed by the inter-station upper layer program.
602 executes.

Further, as shown in FIG.
Has a common directory section 41, a buffer plane corresponding directory section 42, and a packet buffer section 43, among which:
The buffer plane corresponding directory section 42 and the packet buffer section 43 are divided into a plurality of planes.

Also, the packet of each terminal interface 1 and 2 is
Under the control of the OCS 501, each packet is input / output to / from the currently used surface of the packet buffer unit 43.

In this case, the terminal IOCS501 creates and manages various control information such as an interface number and a packet address in the buffer and a transmission / reception destination in a directory of the buffer surface correspondence directory section 42 corresponding to the buffer surface.

When buffer plane switching is necessary to prevent overflow / underflow, the terminal IOCS 501 uses the status of each buffer plane maintained / managed in the common directory section 41, the corresponding relay line number, and the buffer number. Use the top address of the screen.

Further, on the premise of these controls, the terminal upper layer program 601 executes processing of a communication procedure with various terminals.

On the other hand, the inter-station IOCS 502 collectively collects the entire one surface of the buffer surface corresponding directory unit 42 and the entire surface of the packet buffer unit 43 including the information of a plurality of packets, And the common packet buffer 4.

At the time of this control, the use status of each buffer surface maintained and managed in the common directory unit 41, the corresponding relay line number, the buffer surface head address, and the like are used.

Further, the packet relay line interface 3 executes layer 2 control by regarding a part corresponding to one surface of the buffer surface corresponding directory part 42 and the packet buffer part 43 as one packet.

Further, on the premise of these controls, the inter-station upper layer program 602 executes the processing of the communication procedure with the opposite station.

Note that the second embodiment of the present invention is inferior in the buffer amount, the transmission delay time, the control complexity, and the like, but is superior in the transmission efficiency of the trunk line, as compared with the first embodiment. .

〔The invention's effect〕

According to the present invention, when configuring an exchange integrating circuit switching and packet switching, it is possible to simplify hardware and software related to inter-station communication and to configure a highly economical system. is there.

In particular, call control signals for circuit switching and management /
By multiplexing and communicating communication information of operations and the like, a system in which communication procedures up to at least layer 2 are unified can be easily realized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an integrated exchange according to a first embodiment of the present invention, FIG. 2 is a configuration diagram of an integrated exchange according to a second embodiment of the present invention, and FIG. 3 is a second embodiment of the present invention. And FIG. 4 is a flowchart of packet multiplexing in the first embodiment of the present invention, showing the differences between the terminal IOCS and the inter-station IOCS and the functions of the terminal upper layer program and the inter-station upper layer program. 1: Circuit switched terminal interface (CS terminal interface), 2: Packet switched terminal interface (PS terminal interface), 3: Packet trunk line interface, 4:
Common packet buffer, 5: I / O control program (IOC
S), 6: Upper layer program, 7: Processor, 11: Packet assembly / disassembly mechanism for CS control signal (PAD for control signal), 21, 3
1: Layer 2 termination mechanism, 41: common directory section, 42: buffer plane corresponding directory section, 43: packet buffer section, 501:
Terminal IOCS, 502: Inter-station IOCS, 601: Terminal upper layer program, 602: Inter-station upper layer program.

Claims (1)

(57) [Claims] 1. An integrated exchange having an inter-station communication control function of circuit switching and packet switching, wherein a circuit switching terminal interface control means for converting only a circuit switching call control signal of call information from a circuit switching terminal into a packet form. A packet switching terminal interface control means for terminating a packet exchange packet from a packet switching terminal, a packet relay line interface control means for terminating a packet transmitted and received between stations, and a line conversion converted into the packet form. A common packet buffer for temporarily storing a call control signal and the packet switching packet, and a common packet buffer for the line terminal interface control means, the packet switching terminal interface control means, the packet relay line interface control means, and the common packet buffer. I / O of packets between Means for controlling, wherein the circuit switching call control signal converted to the packet form and the packet switching packet are packet multiplexed using the same packet relay line, and communicated with the partner switching station. Characteristic inter-station communication control method.