JPH0213041A - Communication control device - Google Patents

Abstract

PURPOSE:To execute the assignment of a high-speed line utilized in a group slot unit by checking the utilization state of a time slot and housing-changing the time slots assigned to different group slits for switching lines in a specific group slot. CONSTITUTION:A time slot utilization state monitoring part 9 is activated in a fixed period or by a request from the other block, and it checks an individual time slot TS in a group slot GS of a time slot utilization state management table. When the fact that the time slot TS can be switched to the time slot TS in the other group slot GS is judged, a time slot assignment changing part 10 switches the utilized time slot. Thus, an invalid utilization as a line switching area is eliminated, and a loop transmission line can be effectively utilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a communication control device for realizing a loop-type local area network, exchange network, or the like.

BACKGROUND OF THE INVENTION FIG. 6 is a diagram showing the system configuration of a conventional loop network. In FIG. 6, 1a is a communication control device (sensor device) that exists on the loop and has functions such as network monitoring and time slot allocation during frame circulation, and 1b is a communication control device (local device) that has a terminal control function. ).

The communication control device 1 (1a and 1b) is equipped with a call connection/disconnection function, a line setting/release function, and performs call connection processing with a partner terminal in response to a connection request from a terminal housed in the line switching system. The terminals are configured to be able to communicate with each other by making line settings. Reference numeral 2 denotes a loop transmission path that connects the communication control devices 1a and 1b in a loop.

In each communication control device 1, 3 is an optical/electrical signal conversion unit that converts an optical signal and an electrical signal, and 4 is a signal on the loop transmission line 2 and packet information/circuit switching information in the communication control device 1. A demultiplexing unit 5 performs multiplexing and demultiplexing of the
The packet switching unit 7 controls the transmission and reception of packet information with other communication control devices 1 via the packet transmission path 2, and the subscriber line concentrator unit 7 accommodates terminals such as telephones, facsimile IJ devices, and data terminals. 6 is a request from the subscriber line concentrator 7 (
This is a line switching unit that performs call connection control processing and line setting processing. Reference numeral 8 denotes a PCM highway for transferring call data between the subscriber line concentrators 7 and between the line switching section 6 and the subscriber line concentrator 7.

FIG. 7 shows the frame structure of a frame that circulates on the conventional I-rap transmission line 2 and exchanges information. FIG. 8 shows the frame structure of a frame for exchanging information on the conventional PCM highway 8''2 and the procedure for exchanging information between this frame and a frame circulating on the loop transmission line 2.

Incidentally, the frame frequency of the frames circulated between the communication control devices 1 is 8H2.

One frame consists of 64 group slots GS, and IGS consists of 24 time slots 1-TS.

One time slot TS is the minimum unit for exchange and has a transmission capacity of 64 Kb/s. 1 group slot) GS is the switching unit of the exchange area, and each group slot GS is the area designated GS.
The A bit selects either the packet switching area or the circuit switching area. Furthermore, the group slot GS is used as a switching unit for a 1.536 Mb/s high-speed line.

Next, the operation of the above conventional example will be explained using FIG. 6 while referring to FIGS. 7 and 8.

When a connection request is made from the subscriber line concentrator 7a of the communication control device 1a to the subscriber of the communication control device 1b, the line switching unit 6
a is frame and loop transmission line 2 on PCM highway 8a
It secures a time slot for the frame that circulates above, and notifies the other party's communication control device 1b that a connection request has been made. The line switching unit 6b in the communication control device 1b that receives the connection request notification secures a usable channel on the PCM highway 8b, and notifies the terminal of the incoming call via the subscriber line concentrator 7b.

In this case, if the transmission capacity required for a call is 64 Kb/s, only one time slot TS is allocated, and 64 Kb/s is allocated.
If a transmission capacity of K b /s or more is required, multiple time slots TS are allocated. Also, 1,
1 if a transmission capacity of 536 Mb/s is required.
Group slot GS is assigned.

The same frame time slot TS on the PCM highway 8 and the loop transmission line 2 allocated for the call is used until the call ends. Also, the time slot TS is allocated to the first group slot G.
The allocation is performed sequentially starting from the S side.

In this way, in conventional loop networks, time slots for frames on PCM highway 8 and loop transmission line 2 are secured in response to a connection request from a terminal, and after the line is set up, the connection request is made to the other terminal. It was used to communicate between terminals.

Problems to be Solved by the Invention However, in the conventional loop network described above, the time slot TS assigned at the time of line setup is not changed until the line is disconnected.

For this reason, the traffic situation on the loop transmission path decreases, the number of lines in use decreases, and when the time slots TS in use are scattered in different group slots GS, the apparent line appears to be lower than the actual one. Conversion area increases. Therefore, in the above conventional example, even when the traffic is small, the number of empty group slots GS is insufficient because the time slot TS is scattered within multiple group slots GS, and the group slot GS is allocated as a unit at a high speed. There were two issues: the inability to allocate lines and the inability to secure throughput for packet switching.

The present invention solves these conventional problems,
An object of the present invention is to provide an excellent communication control device that can make effective use of a loop network by collectively reaccommodating time slots that are used in a scattered manner for circuit switching into a specific group slot. It is.

Means for Solving the Problems In order to achieve the above object, the present invention includes a time slot usage status monitoring unit and a time slot allocation change unit in the line switching unit of a conventional communication control device, and monitors the time slot usage status. monitor and assign time slots to separate group slots for circuit switching.
It is possible to change the accommodation in the slot.

Functions Since the present invention is configured as described above, it has the following functions. That is, according to the present invention, the time slot usage status monitoring unit of the circuit switching unit detects an empty time slot portion within the group slot area, and if there is an empty time slot portion, the time slot usage status monitoring unit of the line switching unit detects the time slot portion in use. By changing the accommodation of the group to another group slot, the seemingly increased line switching area can be compressed. This makes it possible to allocate high-speed lines and secure the transmission capacity for packet switching.

Embodiment FIG. 1 is a block diagram showing an embodiment of a communication control device according to the present invention. FIG. 2 and FIG. 3 are flowcharts showing the operation algorithm of one embodiment of the present invention,
4 and 5 are time slot usage status management tables used in one embodiment of the present invention.

In FIG. 1, reference numeral 9 denotes a time slot usage monitoring unit, 10 a time slot allocation change unit, and 6 a line switching unit which includes a time slot usage status monitoring unit 9 and a time slot allocation change unit 10. .

1 is a communication control device, 2 is a loop transmission line, 3 is an optical/electrical signal converter, 4 is a demultiplexer, 5 is a packet exchanger, 7
Reference numeral 8 indicates a subscriber line concentrator, and 8 indicates a PCM way, but since these are the same as those explained in FIG. 6, their explanation will be omitted.

Next, the operation of the time slot usage status monitoring section 9 according to an embodiment of the present invention will be explained.

Since no circuit switching calls are occurring when the loop network system is started up, the contents of the group slot GS in the time slot usage management table shown in Figure 4 are all 0, that is, all available areas are for packet switching. is assigned as.

Further, FIG. 5 shows the time slot utilization status at a certain time after a circuit switched call occurs.

In Figure 5, group slots GSI, GS3, G3
4 is allocated for multiple use of low-speed circuit switching circuits. Group slots 1-GS2 and GS5 are assigned to high-speed line switching and packet switching, respectively.

Next, an algorithm for the operation of the time slot usage monitoring section 9 of the present invention will be explained using FIGS. 1 and 2.

First, the time slot usage status monitoring unit 9 in the communication control device 1 (center device) shown in FIG. 1 is started at a fixed period or by a request from another block.

The time slot usage status monitoring unit 9 sets rOJ to the group slot GS check pointer GSP1 located therein.
, set r5J (total number of group slots GS) to pointer GSP2, and select group slot GS.
Initialize the check pointer (FIG. 2A). Next, the usage status of group slot GS is checked from the first group slot GS in the time slot usage status management table, and if packet switching is being used (GS=0) or high-speed line is being used (GS=2), Check the GS in the next group slot (Figure 2B).

If the usage status of the group slot Gs is in use of low-speed multiplex circuit switching (GS=1), set the time slot TS check pointer TSP 1 in the time slot usage status monitoring unit 9 to “0”. After initializing this, a single time slot Ts in the group slot GS of the time slot usage management table is checked (FIG. 2C).

In this case, the time slot TS check pointer TS
Time slot TS specified by P1 is in use (Work 5 =
In the case of 1), the process moves to the next time slot TS, and if all the time slots TS in the group slot GS are in use (all TS=1), the process moves to the next group slot GS. (Figure 2C).

On the other hand, time slot TS check pointer TSP1
The time slot TS specified by is empty (T!5=O)
, the pointer GSP2 and this pointer TS
P2 is used to sequentially check the last time slot TS and search for a time slot TS that is being used as a low-speed line (FIG. 2D).

If it is determined that the tights slot TS can be exchanged with the time slot TS in another group slot GS, the contents of the pointers GSP2 and TSP2 are transferred to the pointers GSP1 and
Copy it to TSPl, notify the communication control device 1 of the originating side and the receiving side involved in the use of the time slot TS of the change of the time slot TS, and after receiving the completion notification, pointer GS.
Clear the contents of P2-TSP2.

At this time, all time slots T of pointer GSP2
When S becomes empty, the usage status bit of pointer GSP2 is set to "0" (Fig. 2E).

Next, the operation of the time slot allocation changing unit according to an embodiment of the present invention will be explained using FIG.

As shown in FIG.
The time slot for sending data from the M highway 8 to the loop transmission line 2 is changed. Then, the time slot to be received after a certain period of time is changed, and the completion notification is sent to the other party's communication control device 1.
send it back to

In this case, in order to prevent communication failures due to timing differences between two communication control devices that receive TS change notifications, information is transmitted in two transmission path time slots for a certain period of time. In the communication control device 1, the time slot exchange unit located on the internal PCM highway 8 and the loop transmission line 2 exchanges information using an elastic store that absorbs bit phases and a frame memory, so the above-mentioned waiting process allows communication between terminals. It does not affect communication in any way.

As a result of the processing described above, for example, in the time slot usage situation shown in FIG. 5, only the fifth group slot GS is assigned as the packet exchange area. By using this, group slots GS3 and GS4 can be used for packet exchange, and this group slot GS3 and GS4 can also be used for packet exchange.
It is now possible to allocate S3 and GS4 to high-speed lines that are used in group slot GS units.

As described above, according to the above embodiment, the time slot usage status monitoring unit 9 checks the usage status of the time slot 1-TS, and the time slot allocation change unit 10 that receives the notification changes the usage time slot based on the information. , there is no longer any invalid use of the line switching area, and the loop transmission path can be used effectively.

In the above embodiment, the case where the center device checks the usage status of the time slot has been explained, but the usage status of the time slot can also be checked by the local device.

Effects of the Invention As is clear from the above embodiment, the time slot usage status monitoring unit checks the usage status of the time slot 71-, and separates group slots GS for line switching.
By changing the accommodation of the time slot TS allocated to a group slot into a specific group slot, packet switching traffic is improved, and it is also possible to allocate a high-speed line to be used for each group slot Gs.
This has the effect of making effective use of the I-rap transmission line.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing an embodiment of a communication control device according to the present invention, and FIGS.
5 and 5 are explanatory diagrams showing a time slot usage status management table in one embodiment of the present invention, and FIG.
FIG. 7 is a block diagram showing the system configuration of a conventional loop network. FIG. 7 is an explanatory diagram showing the frame structure of frames circulating on a loop transmission path. FIG. FIG. 2 is an explanatory diagram showing a frame configuration and a data transfer procedure between this frame and a frame circulating on a loop transmission path. DESCRIPTION OF SYMBOLS 1... Communication control device, 2... Loop transmission path, 3... Optical/electrical signal converter, 4...
... Demultiplexing unit, 5...Packet switching unit, 6
. . . Line switching section, 7 . . . Subscriber line concentration section, 8 . . . PCM highway, 9 . . . Time slot usage monitoring section, 10... ...Time slot allocation change section. Name of agent: Patent attorney Toshio Nakao and one other person Figure SA 0゛Packet communication sanctuary l Mouth seal deposit area Figure FC-Frame on Hibney 8L PCM Frame A on highway ab

Claims (1)

[Claims] An optical/electrical signal converter that converts an optical signal and an electrical signal, a demultiplexer that multiplexes and demultiplexes packet information and circuit switching information, and a packet that controls transmission and reception of packet information. a switching section; a subscriber concentration section for accommodating terminals;
A PCM highway that transfers call data between the subscriber line concentrators and between the line exchange unit and the subscriber line concentrator; and a line exchange unit that performs call connection control processing and line setting processing in response to requests from the subscriber line concentrator. , a time slot usage status monitoring unit that checks the usage status of the time slot, and a time slot allocation change unit that accommodates the time slot within a specific frame. A communication control device characterized in that time slots assigned to different group slots for exchange are changed to be accommodated within a specific frame.