JP2003037575A - Time division multiplex transmitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide effective use of a noncontinuons vacant area generated during operation as a data area of a newly added station in a time division multiplex transmitting device which sends data including sending data to time division multiplex slots. SOLUTION: The device comprises a detective means to detect that a time slot used for sending data is vacant, and a change means to change the time slot allocations so that a virtually vacant time slot can adjoin another vacant time slot when the vacant time slot does not adjoin another vacant time slot.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time division multiplex transmission device that connects transmission devices that multiplex / separate a plurality of terminal station data.

[0002] Time-division multiplex transmission in which data from a plurality of terminal stations is transmitted from a transmission apparatus to another transmission apparatus via a transmission path and separated by another transmission apparatus to a partner terminal station The technology to operate the road efficiently is widespread.
In such multiplexed transmission, each time slot on the frame of the multiplex transmission path is assigned to each terminal station for operation, so that once the system is constructed, additional terminal stations may be added or removed. In that case, efficient use of limited frame formats is required.

[0003]

2. Description of the Related Art FIG. 24 is a block diagram of a conventional example. In the figure,
Reference numeral 50 is one transmission device A, 51 is a terminal station 1 to terminal N having various transmission speeds accommodated in the transmission device A, 52 is a transmission line for transmitting a digital signal from the transmission device A to the transmission device B,
53 is a transmission path for transmitting digital signals in the opposite direction to the transmission path 52, 54 is the other transmission apparatus B, and 55 is the terminal stations 1'-N 'housed in the transmission apparatus B. Further, in the transmission device A (50), 500 is a terminal station interface (displayed with IF), 501 is a multiplexing unit (displayed with MUX), 502 is a separation unit (displayed with DMUX), and the transmission device B (54) is also The transmission apparatus A has the same configuration as that of the transmission apparatus A, and 540 is a terminal station IF, 5
41 is a multiplexing unit (MUX), 542 is a demultiplexing unit (DMUX)
Is.

In the configuration of this conventional example, in the case of the transmission apparatus A, the transmission speed of each of the terminal stations 1 to N is 64 Kbps, and is an integral multiple of 64 × n (n = 1, 2, 3 ...)
It is assumed that the terminal station 1 has a transmission rate of Kbps and the terminal station 1 has 128
Kbps, terminal station 2 is 64 Kbps, terminal station 3 is 192 Kb
ps, ..., Terminal station N is 1.5 Mbps (64 Kbps × 2)
4). The signals from each of the terminal stations 1 to N are multiplexed by the multiplexing unit (MUX) 501 via the corresponding terminal station IF 500 and transmitted to the transmission device B through the transmission path 52.
The transmission line 52 (same for the transmission line 54) is composed of eight parallel signal lines, and each signal line transmits at a transmission rate of 6.48 Mbps. In the transmission device B, the separation unit (DMU
X) 542 separates the signal for each terminal station and transmits it to each terminal station 55 through the corresponding terminal station IF 540. Terminal 5
The signal transmitted from the terminal 5 is transmitted from the terminal station IF 540 to the multiplexing unit (MUX) 541 and multiplexed, and each terminal station of the transmission apparatus A is processed by the same method as the transmission from the transmission apparatus A to the transmission apparatus B. Transmitted to.

FIG. 25 is a diagram showing the timing of signals on the multiplex transmission path and the frame structure. In FIG. 25, (1) indicates 8K (8 kilohertz, which defines the length of one frame, and C
Basic clock of K8k (1 cycle is 125 μse)
c), and (2) is the transmission line 5 provided between the transmission devices.
6.48M (meaning megahertz, CK6.4) that is synchronized with the bit signal on each parallel signal line of 2 (53 is also the same)
(Indicated by 8). (3) is an enlarged view of the clock shown in (2) above, showing parallel signal lines (DATA7 ...
DATA0) represents each time slot shown in (4) to (11), each clock represents 8 Kbps, and (4) to (11) (however, (5) to (10) are not shown) are shown in the transmission line 52. 8 shows a part of the multiplex frame format of the eight parallel signal lines (DATA7 to DATA0) that make up 8Kb in one time slot shown in (3) above by the eight parallel signal lines.
Transmission of ps × 8 = 64 Kbps is performed. (12) is
It is a description of the format of the parallel signal lines shown in (4) to (11). By the parallel transmission of the transmission path 52, transmission of 6.48M × 8 = 51.84M is substantially performed.

In the example shown in FIG. 25, on the eight parallel signal lines forming the transmission path 52 from the transmission device A to the transmission device B, each time slot is constituted by a clock of 6.48M, and one frame ( 125 μsec) consists of 810 clocks (time slots), and (3)
Are the time slot numbers 808, 809, 0,
Only 1, 2, ..., 17 are shown. The 0th to 9th time slots are the header area and represent the beginning of the frame, the 10th to 809th slots are the valid data areas, and the 10th and 11th slots are the data of the terminal station 1. 6
It is allocated for transmission at a speed of 4 Kbps × 2 = 128 Kbps, and the next 12th time slot is allocated for transmitting data of the terminal station 2 at a speed of 64 Kbps. Further, the 13th to 15th time slots are allocated by the terminal station 3 for transmission at a speed of 64 Kbps × 3 = 192 Kbps, and, although not shown in the figure, each time slot is allocated to each terminal station for operation. When the transmission device A of the transmission source allocates such a time slot, the transmission device B of the other party is also notified of the setting contents to operate the system.

[0007]

As described above, in the conventional multiplex transmission system, once a time slot is allocated to each terminal for a transmission frame, the allocation can be changed in the communication state. I can't do it. For this reason, when an arbitrary terminal station is removed, the time slot (data area) assigned to the terminal station becomes an empty area.

Therefore, when a new terminal station is added, only the terminal station having a lower transmission rate than the empty area can be added although the total unused area of the entire frame allows transmission. If a terminal station with a higher transmission rate than the empty area is added, the transmission of all terminal stations must be interrupted and a continuous area equal to the transmission rate of each terminal must be reallocated. there were.

The present invention uses a frame control method for a time division multiplex transmission line in which a non-contiguous empty area generated during operation can be efficiently used as a data area of a newly added terminal station. The purpose is to provide.

[0010]

FIG. 1 is a diagram showing a first principle configuration of the present invention. In the figure, 1 is a multiplex transmission device, 10
Is a transmission unit for transmitting data from each terminal station in a time slot assigned to each terminal, 10a is an empty area detecting means for detecting a data area containing data representing an empty space generated by the removal of the terminal station, and 10b is an empty area. A specific code inserting means 10c for inserting a specific code is a data area refilling means for converting assigned time slots so as to connect the empty areas after transmitting the specific code (a predetermined number of frames). Further, 11 is a receiving section, 11a is a specific code detecting means for detecting a specific code in a frame, 11b is a specific code detection, and when separating data by the same rule as the time slot change performed on the transmitting side. It is a data area updating means for updating the allocated time slot information to be used.

According to the first principle, when one terminal station is removed during operation and a vacancy occurs, the vacant area detecting means 10a in the transmitter 10 of the multiplex transmission apparatus 1 includes a vacant area containing data indicating the vacancy. Is detected, and the specific code insertion means 10b detects the specific code indicating the empty area by this detection.
It is inserted in a time slot that is an empty area on the frame. After sending the frame including the data area of this specific code a predetermined number of times (the number of protection steps (1 or more) so that the other party does not malfunction even if the same pattern as the specific code occurs by mistake), it becomes empty. The time slot allocation of the newly vacant area and the areas before and after it so as to connect the areas is reorganized according to a predetermined rule. Although a device on the other side for receiving the frame of this transmission line is not shown, it is provided with the receiving section 11 shown in FIG. 1, and when the specific code is detected from the received frame by the specific code detecting means 11a, it is detected. When it is identified that the area is empty and the specific code is detected by the predetermined number of frames, the data area updating means 11b reconfigures the time slots of the frames received thereafter according to a predetermined rule. Is recognized and the received data is separated according to the time slot after reorganization.

FIG. 2 shows the second principle configuration of the present invention. In the figure, reference numerals 1, 10 and 11 used in FIG. 1 are the same as those in FIG. 10 in the transmitter 10
a is an empty area detecting means, 10d is a control data setting means for transmitting an empty time slot position and data length, 1
Reference numeral 0c is a data area refill means similar to that shown in FIG.
Reference numeral 11c in the receiver 11 is a control data detecting means, and 11b is a data area updating means similar to that shown in FIG.

In the second principle configuration, when one terminal station is removed during operation and a vacancy occurs, the transmitter 10 of the multiplex transmission apparatus 1 detects a vacant area detecting means 10a, and by this detection The control data setting means 10d allocates the control data area by either a specific area in the header of the frame or by using a part of the data area,
Information indicating the position of the empty area (the position of the time slot from the beginning) and the length of the empty area (the length of the time slot) is set as control data, a frame containing the control data is transmitted, and then the data area The time slot assignments of the area vacated by the refilling means 10c and the areas before and after the empty area are reorganized according to a predetermined rule. In the receiving section 11 on the partner side, the control data detecting means 11c detects the control data in the frame. When the control data is detected, if the position of the empty area and the length of the empty area are identified, the data is detected. The area updating means 11b separates the received data according to the time slots reorganized according to a predetermined rule.

FIG. 3 shows the third principle configuration of the present invention. In FIG. 3, reference numerals 1, 10 and 11 are the same as those in FIG. In the transmitting unit 10, 10a is a free area detecting means, 10b is a specific code inserting means for inserting a specific code representing a free area into an empty area, 10e is a refill data writing means, 10f is a switching timing setting means, and 100 is A first memory for multiplexing, 101 is a second memory for multiplexing, and 102 is a selecting means. Reference numeral 11a in the receiver 11 is a specific code detecting means similar to that shown in FIG.
Is a refill change control means, 11e is a switching timing detection means, 110 is a first memory for separation, 111 is a second memory for separation, and 112 is a selection means.

In the third principle configuration, the multiplex transmission device 1
When a space is generated in the transmission unit 10 due to removal of a terminal station, the space is detected by the space area detecting means 10a, whereby the specific code inserting means 10b inserts the specific code into the space area and the refill data writing means. By 10e,
The empty area is refilled with the data of the other other terminal stations, and the refilled data is written in the second multiplexing memory 101. Further, when the transmission by the specific code inserting means 10b is completed, the switching timing setting means 10f is driven, whereby the control data in the frame includes the switching timing information and is transmitted. At this time, the selection means 102 is switched, and the data forming the transmission frame is taken out from the second multiplexing memory 101.

In the receiving section 11, the specific code detecting means 11
When the specific code is detected in a, the refill change control means 11
When d is driven, the read control of the received data stored in the second memory for separation is changed to perform separation corresponding to the slot change on the transmission side. After the specific code is detected, the switching timing is detected by the control data by the switching timing detection means 1
When it is detected by 1e, the selection means 112 is driven, and the second separation memory 111 is selected and output to each terminal station.

FIG. 4 shows a fourth principle configuration of the present invention. In FIG. 4, reference numerals 1, 10, and 11 are the same as those in FIGS.
The description is omitted because it is the same. In the transmitting unit 10, 10a is a free area detecting means, and 10g is a control that indicates the position of the free area that is allocated when the free area in the missing tooth state is allocated as a data area for a terminal station (including a case where a plurality of areas are randomly allocated). It is a control data generating means for generating data. Further, 11c in the receiving unit 11 is a control data detecting means for detecting control data indicating the position of the empty area, 11
Reference numeral b is a data area updating means similar to those shown in FIGS.

In the fourth principle configuration, when the terminal station is removed during operation, a vacancy occurs, and as a result, a vacant vacant area (a plurality of areas) occurs, the positions of these vacant areas are changed. Instead, it is assigned as the data area of another terminal station. At that time, the data representing the position of the empty area (the time slot position on the frame) allocated by the control data generating means 10g is transmitted as control data (a part of the header or a part of the data area). When allocating a plurality of vacant free areas, data representing a plurality of positions are sequentially included in the control data.

In the receiving section 11, the control data detecting means 11
The position indicated by the control data in c is identified as the newly allocated data area, and is set as the data area by the data area updating means 11b. When other data areas are also allocated, the data indicating the position of the data area allocated by the control data of the subsequent frame is set and transmitted, and is similarly received by the receiving unit 11. According to the fourth principle, it is possible to allocate a plurality of vacant data areas that have occurred randomly to a new terminal station and use them effectively.

FIG. 5 shows a fifth principle configuration of the present invention. In FIG. 5, reference numerals 1, 10, and 11 are the same as those in FIGS.
The description is omitted because it is the same. Reference numeral 10h in the transmission unit 10 is a data copying means for copying the data in the data area allocated to the existing terminal station to the empty data area, 10
Reference numeral i is a duplication control data setting means for setting data (duplication source time slot number, duplication destination time slot number, etc.) relating to duplicated data, and 10j is a data area releasing means for releasing the copy source data area. 1 in the receiver 11
Reference numeral 1f is a duplicated data detecting means for detecting data relating to duplicated data, and 11b is a data area updating means.

In the fifth principle configuration, when a space is created due to removal of a terminal during operation and a missing tooth (skipping) occurs, the data copying means 10h causes another data area to be added to the empty data area. Copy the terminal data assigned to. At this time, the duplication control data setting means 10i
Operates and the position of the data area of the copy source (time slot number) and the position of the data area of the copy destination (time slot number) are set and transmitted. In this way, the frame in which the data of the same terminal station is set in the two areas of the copy source and the copy destination is transmitted. After that, the data area releasing means 10j
Releases the copy source data area to make it free.

In the receiving section 11, when the positions of the copy source and copy destination data areas are identified by the duplication control data detecting means 11f, the copy destination is identified as a new data area, and the data area updating means 11b is used for the original terminal station. The position of the data area of is updated to the position designated as the copy destination.

[0023]

FIG. 6 shows a first configuration of the embodiment. In the figure, 2 is a multiplexer (MUX), 3 is a demultiplexer (DM).
UX section) and 4 are transmission lines composed of eight parallel transmission lines. The multiplexing unit 2 and the demultiplexing unit 3 of FIG. 6 correspond to the transmitting unit 10 and the receiving unit 11 of the principle configuration shown in FIGS.
A transmission device including both the multiplexing unit 2 and the demultiplexing unit 3 corresponds to the multiplexing transmission device in FIG. That is, in this embodiment,
Although omitted in the drawing, a multiplex transmission apparatus having a set of the multiplex section 2 and the separation section 3 as shown in FIG. 24 may be connected by the transmission line 4.

In the multiplexing unit 2, 20 is a large number of terminal stations a,
When serial data from b, c, d, ..., N is input, it becomes 8-bit parallel data synchronized with the internal clock of the device (basic clock of 8 KHz and bit signal of 6.48 MHz). 1 to 24 (64 Kb) corresponding to the data rate of the terminal station
ps-1.5 Mbps) device data converter (including a conventionally known elastic store capable of varying the input signal speed and the output signal speed), 21 is a code transmission for transmitting a fixed pattern representing an empty area Reference numeral 22 is a control device for generating a control signal according to a program. Reference numeral 23 is a selection for inserting the fixed pattern from the code transmitting portion 21 having a fixed pattern representing an empty data area (time slot) into the removed terminal station area. Part (displayed by SEL), 2
4 is a transmission line data multiplexing unit that multiplexes 8-bit parallel signals from each terminal station according to the timing control of the multiplexing timing generation unit 25 and allocates them to the data area on the frame format, 25 is a multiplex timing generation unit, and 26 is transmission line data. It is a serial / parallel converter that converts the signal converted into the frame format by the multiplexer 24 into an 8-bit parallel signal.

In the separation unit 3, 30 is a parallel / serial conversion unit, 31 is a code detection unit, 32 is a control device that operates by a predetermined program to generate a control signal, and 33 is under the timing control of the separation timing generation unit 34. A transmission line data separation unit that separates and outputs received data, 34 is a separation timing generation unit, and 35 is a terminal station data conversion unit that includes an elastic store.

The transmission line 4 has the same structure as the signal timing and frame structure on the transmission line of the conventional example (see FIG. 25).
It is composed of two parallel signal lines, and on each signal line, one frame (125 μsec) is composed of 810 time slots synchronized with a clock of 6.48M, and a header (1
0 time slot) and a data area of 800 time slots.

The operation when the function of the first principle configuration is realized by the first configuration of the embodiment shown in FIG. 6 will be described with reference to FIGS. 7 to 9. FIG. 7 is a first time chart of the embodiment, FIG. 8 is an example of a fixed pattern representing an empty area, and FIG. 9 is a first flow chart of the embodiment. ． Is a flowchart in the multiplexing section, B. Is a flowchart in the separation unit.

In this description, the terminal station a accommodated in the device data converter 20 is 128 Kbps, and the terminal station b is 64 Kbp.
s, terminal station c is 192 Kbps, ..., Terminal station n is 1.536
Assuming that it has a data rate of Mbps, the device data converter 20 receives the terminal clocks and the device clocks, and outputs the serial data of each terminal to each of the eight (8) whose time slot speed is 8 kbps ( It is converted to an 8-bit parallel signal. As a result, the signal of the terminal station a becomes (2
One time slot) × (8-bit parallel signal), which is displayed as 2 × 8 in FIG. Similarly, the terminal station b is converted into a 1 × 8 signal, the terminal station c is converted into a 3 × 8 signal, and the terminal station n is converted into a 24 × 8 signal. In the normal state, these signals pass through the selection unit (SEL) 23 and are input to the transmission path data multiplexing unit 24 as they are. The transmission path data multiplexing unit 24 receives a set of 8-bit parallel signals from each terminal station as a set of 8-bit 6.48 signals.
They are multiplexed so that they can be placed on the multiplex frame format of MHz, and are sequentially stored in the internal memory. Although not shown, the internal memory has a capacity of 800 (the number of time slots in the valid data area excluding the frame header) × 8 bits.

At this time, the multiplex timing generator 25
From the KHz clock signal (CK8K) and the 6.48 MHz clock signal (CK6M), the enable signals ENa and EN corresponding to the data area assigned to each terminal station are provided.
, ENn are generated, and the transmission path data multiplexing unit 24 extracts the input signal from each terminal station by these enable signals ENa, ENb, ..., ENn and stores them in the internal memory. It is to be noted that which terminal slot data is multiplexed to which time slot position is determined by the timing control of the multiplex timing generator 25 under the software control of the controller 22. Further, the frame header signal is generated in the multiplex timing generation section 25 under the control of the control device 22, and is inserted in the serial / parallel (PS) conversion section 26 at a predetermined position in the frame signal. The serial / parallel conversion unit 26 uses the internal memory 800 of the transmission path data multiplexing unit 24.
A × 8 (bit) parallel signal is converted into a serial signal on eight transmission lines.

In the demultiplexing unit 3, the operation reverse to that of the multiplexing unit 2 described above is performed in the normal operation state, and the parallel / serial conversion unit 30 converts it into eight serial signals, and the transmission line data demultiplexing unit 33.
Is converted into an 800 × 8 parallel signal and stored in the memory. Next, these parallel signals are separated into the timing generator 34.
The enable signals ENa 'to ENn' corresponding to the time slots of each terminal station are separated into signals of 1 to 24 slots corresponding to the speed of the 8-bit parallel terminal station directed to each terminal station. The data converter 35 transmits the data in the form of serial signals to the respective terminal stations a ′, b ′, c ′, ..., N.

FIG. 7 shows only the time slots 10 to 16 which are a part of the frame output from the serial-parallel converter 26 to the transmission path 4. Terminal station a, which is in normal operation,
Terminal station b, time slot 10 assigned to terminal station c,
11 (displayed in data areas a1 and a2), time slot 12 (displayed in data area b1), time slots 13 to
15 (indicated by data areas c1, c2, c3) and a time slot 16 (empty area) are shown.

The terminal station b assigned to the time slot 12 shown in FIG.
When becomes empty, the state shown in FIG. 9A. According to the flowchart of the multiplexing unit shown in Fig. 6, when the terminal station is removed in the normal operation state, the removed terminal station (time slot position forming the data area) is removed by the software of the control device 22 (Fig. 6). Recognize (A.
S2). On the other hand, a fixed pattern (code) representing a free area which is constantly generated is input from the code sending section 21 to the selecting section 23, and an example of the code is shown in FIG.

"CODE" in FIG. 8 represents an 8-bit code composed of D7 to D0. Here, "10101010"("AA" in hexadecimal notation) is used as an example of a fixed pattern representing an empty area.
Are using. In this explanation, terminal station b (64 Kbp
s) has been removed, the control device 22 instructs the selection unit 23 to insert the code into the removed region of the terminal station b (time slot 12 in FIG. 7), and the selection unit 2
When the selection is performed by the operation of No. 3, the fixed pattern is transmitted on the time slot 12 of the frame (A.
S3).

In order to prevent such a fixed pattern from being erroneously identified as valid data, it is transmitted a predetermined number of times (1 or more, here 3 times). 9A. In the flowchart of FIG. 7, it is checked that the code is transmitted three times in S4, and the code is transmitted in the three frames shown in FIG. After this, the control device 2
By controlling the multiple timing generation unit 25 by the control of 2,
The insertion point of the terminal data of the time slot in which the fixed pattern is inserted and the subsequent time slots (up to the next empty time slot) is changed (S in A of FIG. 9).
5). In the example of FIG. 7, time slot 1
The data c1, c2, and c3 of the terminal station c are changed to be inserted into the terminals 2, 13 and 14, the time slot 15 becomes empty, and an empty area continuous with the time slots 15 and 16 can be secured.

In the separating unit 3, the control unit 32 controls the B.C. The process of the flow shown in is performed. When the terminal station removal occurs in the normal operation state, it is recognized by software (recognizing that the terminal station in the transmission device provided with the separating unit 3 has been removed, S2 in B. of FIG. 9). Furthermore, when a code with a fixed pattern is detected in the data area when a frame from the partner device is received, it is recognized that the terminal station on the partner device side has been removed (S3 in B. of FIG. 9), and this code is used. It is determined whether or not three times (three frames) have been detected (at step S4), and when detected, the separation timing is changed by the separation timing generation unit (34 in FIG. 6) to change c1 to c3 as shown in FIG.
Are extracted from slots 12 to 14 (at step S5).

The operation for realizing the function of the second principle configuration (FIG. 2) by the first configuration of the embodiment shown in FIG. 6 will be described with reference to FIGS. 10 to 12. 10 is a second time chart of the embodiment, FIG. 11 is an example of control data for slot designation, and FIG. 12 is a second flowchart of the embodiment, which is executed by the control device of the multiplexing unit and the demultiplexing unit.
Is a flowchart in the multiplexing section, B. Is a flowchart in the separation unit.

A serial / parallel converter 26 (FIG. 6) shown in FIG.
Only the time slots 8 to 15 which are a part of the frame output from the transmission line 4 to the transmission line 4 are shown. For time slot 10 and 11 (data a1,
a2), the time slot 12 (data b1) in the terminal station b,
Time slot 13 to 15 (data c1 to c
3) is allocated respectively, and the time slots 8 and 9 are areas allocated for control data in the header. Here, when the terminal station a is removed, a1 and a2 become empty as shown in FIG. Here, in the multiplexing section, the A. The process of the flowchart shown in is executed. That is, when the terminal station is removed, the terminal station that has been removed by software is recognized by the change of the control signal separately input from the terminal station (S2 in A. of FIG. 12).

On the other hand, in order to specify the time slot of the removed terminal station b, the control data having the configuration shown in FIG. 11 is set in the control area (either a partial area in the header or a specific data area). To send. In this example, two slots (8 bits in one slot) consist of 16 bits, and the leading 8 bits (8th slot) in the upper row is set to "1", which means that a missing tooth (vacancy) has occurred. Is displayed,
After that, 7 bits represented by "*" and 10 bits from the beginning of the 8th bit (9th slot) of the 9th slot (lower part of Fig. 11) of the control data to the 3rd bit in total make up the start position of the empty time slot. (Time slot numbers 10-80
(1 of 9) is displayed in binary. The remaining 5 bits of the ninth slot represent the data length (the number of slots of 1 to 24) from the beginning to the end of the empty time slot in binary.

In the example of FIG. 10, as shown by, "81h" (h is hexadecimal display), "4" in the time slots 8 and 9
"2h" is displayed, and the first time slot of the empty time slot is "10", indicating that the "2" time slot from the beginning is empty. Such control data is generated by the control device 22 (FIG. 6), supplied from the multiplex timing generation unit 25 to the serial / parallel conversion unit 26, and transmitted (FIG. 12).
S3). After that, the multiple timing generation unit 25 (FIG. 6)
10, the insertion point is changed so that the time slot 10 is the data b1 of the terminal station b and the time slots 11 to 13 are the data c1 to c3 of the terminal station c, respectively.
Control data transmission is stopped (S4 in FIG. 12), and normal operation is resumed.

In the separating unit 3, the B. As shown in FIG. 12, the removal of the terminal station is recognized by software by the control signal separately notified from the multiplexing unit (S2 of B. of FIG. 12), the control data of the received frame is detected (S3 of the same), and the separation timing is detected. To change the point of the drop data (at step S4). That is, the succeeding time slots are shifted forward by the empty time slots indicated by the control data.

FIG. 13 shows a second configuration of the embodiment. In the figure, reference numerals 2, 3 and 4 are the same as those in the first embodiment of FIG. 6, and reference numerals 20 to 26 in the multiplexing unit 2 and reference numeral 3 in the separating unit 3
Since 0 to 35 are the same as those in FIG. 6, their description will be omitted.
Reference numeral 27 in the multiplexing unit 2 is an 800 × 8-bit memory, 28 is a frame memory (not shown) in the transmission path data multiplexing unit 24, or a selection unit (displayed by SEL) for selecting one of the memories 27. Further, 36 in the separation unit 3 is an 800 × 8-bit memory, 37 is a memory (not shown) in the transmission path data separation unit 33, or a selection unit (displayed by SEL) for selecting one of the memories 36. .

With the second configuration of this embodiment, the third
The function of the principle configuration (Fig. 3) is realized and its operation is shown in Fig. 1.
This will be described with reference to FIGS. FIG. 14 is a third time chart of the embodiment, FIG. 15 is an example of control data of a fixed pattern and switching timing, and FIG. 16 is a third flow chart of the embodiment. Similar to FIG. 9 and FIG. ． Is a flowchart in the multiplexing section, B. Is a flowchart in the separation unit.

In the normal operation state, the multiplexer 2 of FIG. 13 multiplexes the data from each terminal in the transmission path data multiplexer 24 and sets it in the internal 800 × 8 bit memory.
The control unit 22 controls the selection unit 28 to select the transmission path data multiplexing unit 24, so that the data is input to the serial / parallel conversion unit 26 and transmitted to the transmission path 4. The separation unit 3 on the receiving side also controls the selection unit 37 by the control input of the control device 32 to control the selection unit 37 by the output of 800 × 8 bits stored in the memory inside the transmission path data separation unit 33.
Output to 5.

FIG. 14 shows a part of the frame in normal operation. In this example, the time slot 9 is a part of the header, and this is used as a control data area, and the time slot 10 and 11 are assigned to the terminal station a.
(Data a1, a2), time slot 12 at terminal station b
(Data b1), time slots 13 to 15 at the terminal station c
(Data c1 to c3) are respectively assigned.
Here, when the terminal station a is removed, as shown in FIG. 14, a1, a2, and c1 to c3 become empty. Here, in the multiplexing unit, the A. The process of the flowchart shown in is executed. That is, when the terminal station is removed, the terminal station that has been removed by software is recognized by a control signal separately notified from the multiplexing unit (S2 in A. of FIG. 16), and a fixed code is added to the empty area. (Pattern) is set and transmitted (at step S3). An example of the fixed pattern of this empty area is shown in FIG.
5 shows. In this example, the pattern of "10101010", that is, "AAh" is used for the empty area.

Then, the front-justified data is accumulated in the memory 27 under the control of the control device 22 (S in A of FIG. 16).
4). As shown in the state of the memory 27 of FIG. 14, this front-justified data is obtained by deleting the time slots used by the removed terminal stations a and c and the terminal stations b and d. (D1, d2) and the terminal station e (e1) are front-justified and accumulated. When the frame of FIG. 14 is transmitted n times (three times) or more, the switching timing code is transmitted to the control area in the time slot 9 (S5 and S6 of A. of FIG. 16), and the data multiplex unit transfers it to the memory. The code transmission at the switching timing is stopped (at step S7), and the normal operation state is set. An example of the code of the control data of the switching timing is shown in FIG. 15, and is “11001100” (CCh) in this example.

In the example of FIG. 14, after the switching timing code is transmitted in the time slot 9 as shown in, the memory storing the refilled data is selected and transmitted as shown in.

In the separating section 3 (FIG. 13), B. The operation is performed according to the flowchart shown in FIG. 2, and in the processing of S2 to S4, after detecting an empty fixed pattern and storing the left-justified data in the memory 36, after detecting the fixed pattern n times, the control area switching timing ( CCh) is detected, the selection unit 37 is controlled to switch the source output to the terminal station data conversion unit 35 from the data separation unit 33 to the memory 36. The structure of the frame in the separating unit 3 is the same as the memory of the multiplexing unit shown in FIG. Is selected and output.

With the first configuration of the embodiment shown in FIG. 6, the function of the fourth principle configuration (FIG. 4) can be realized. A control operation therefor will be described with reference to FIGS.

FIG. 17 is a fourth flow chart of the embodiment, which is executed in the control unit of the multiplexer and the demultiplexer,
A. Is a flowchart in the multiplexing section, B. Is a flowchart in the separation unit. FIG. 18 is a fourth time chart of the embodiment, and FIG. 19 is an example of control data for slot designation.

FIG. 17A. In the normal operation state, when the terminal station is removed, the above-mentioned Embodiment 2 and Embodiment 3
Similarly to the above, the terminal station removed by software is recognized by the control signal separately notified from the multiplexing unit (S in A of FIG. 17).
2). In the case of the time chart shown in FIG. 18, a part of the frame during normal operation (time slots 8 to 15) is shown, time slots 8 and 9 are allocated for control data, and time slots 10 and 11 are assigned to the terminal station a. , The time slot 12 is assigned to the terminal station b, the time slot 13 is assigned to the terminal station c, and the time slots 14 and 15 are empty. When the terminal station b is removed in this state, the area of b1 of the time slot 12 becomes empty as shown in FIG.
When allocating the time slot used by the removed terminal station to another terminal station (for example, a terminal station to be newly added (added)), a code including the number of the newly allocated time slot is transmitted (see FIG. 17). A. S3).

When a newly added terminal uses a plurality of time slots, the numbers of a plurality of empty time slots (including non-consecutive time slots, which are discontinuous time slots) are sequentially assigned in a plurality of frames. To the control data. Then, the multiple timing generation unit 25 (see FIG.
3) is changed to one that includes a new terminal station to which the multiplex timing of each terminal station generated is added (S in A. of FIG. 17).
4) When there is no change in the control data, the code transmission is stopped (at steps S5 and S6). Also in the separating unit 3, B.
According to the flowchart shown in FIG. 5, a process for detecting the code indicating the position of the time slot allocated for the added terminal station from the control area and changing the separation timing is performed.

FIG. 19 shows an example of control data when the time slot for the terminal station to be added is designated. In this case, the control data is represented by 16 bits of two time slots (time slots 8 and 9 shown in FIG. 18). That is, the top 8 bits in the upper row are set to "1" to indicate that there is a new slot allocation, and the subsequent 7 bits and the top 3 bits in the lower row are 10 bits in total (each bit is represented by *). The time slot position for allocation is shown, and the remaining 5 bits (each bit is represented by Δ) represent the number of allocated time slots (1 to 24).

In the example of FIG. 18, two time slots are assigned to the terminal station d to be added. Frame, the control data for time slots 8 and 9 is "1000000110".
By setting and transmitting "000010" (8182h), the time slot number "12" and the allocated slot number "2" are transmitted to the receiving side. As a result, the receiving side
Recognize that a total of 2 slots are allocated, including 2 ”. In FIG. 18, as control data, "100000
0111000001 ”(81C1h) is set, the time slot number is“ 14 ”, the number of allocated slots is“ 1 ”(already“ 1
Since "2" is assigned (subtraction), it is notified to the receiving side. As a result, the receiving side assigns "14" in addition to "12",
The completion of the allocation is recognized by the allocation slot number "1".

According to the embodiment corresponding to the fourth principle of the present invention, it is possible to set the areas of the discontinuous time slots for the newly added terminal station while maintaining the operating state.

FIG. 20 shows the third configuration of the embodiment. In the figure, reference numerals 2, 3 and 4 are the same as those in the first embodiment shown in FIG. 6, and reference numerals 20 to 26 in the multiplexing unit 2 and reference numerals 30 to 35 in the separating unit 3 are the same as those in FIG. The description is omitted. Reference numeral 29 in the multiplexing unit 2 is a memory for copying.

With the third configuration of this embodiment, the fifth
The function of the principle configuration (Fig. 5) is realized, and its control operation will be described with reference to Figs. 21 is a fifth time chart of the embodiment, FIG. 22 is a configuration example of control data, and FIG. 23 is a third flowchart of the embodiment. Is a flowchart in the multiplexing section, B. Is a flowchart in the separation unit.

In the normal operation state, the multiplexing section 2 of FIG. 20 has a time slot shown in FIG. 21 which shows a part of the frame in normal operation. In this example, the time slots 7 to 9 are allocated as a control data area (a header or a part of the data area is allocated), the terminal station a has a time slot 10 (data a1), and the terminal station b has time slots 11 and 12 ( Data b1, b2), terminal c
A time slot 13 (data c1) is assigned to each. When the terminal station a is removed during such an operation, the time slot 10 (a
1) becomes empty. At this time, in the multiplexing unit, the A. The processing from S2 onward of the flowchart shown in is executed.

That is, when the terminal station is removed, the removal of the terminal station is recognized by the software (S2 in A. of FIG. 23),
A code (including display of duplicate data and display of copy source time slot and copy destination time slot) representing duplicate data is set in the control data area (time slots 7 to 9) and transmitted (at step S3). Next, the subsequent data (data of the subsequent time slot) having the same data length (the number of time slots) as the empty tooth gap area is added to the multiplexing unit 2 (see FIG. 2).
0) to the copy memory 29 (S. of A. of FIG. 23).
4) The copied data is transmitted to both the empty time slot (copy destination time slot) and the copy source time slot for a certain period of time. After that, the copy source area is released (as an empty data area) and the control data transmission is stopped.

In the separating section 3, the B. It operates according to the flowchart shown in FIG. 2, receives a frame sent from the multiplexing unit 2 of the transmission device on the transmission side, and removes the transmission source or the terminal station of the own device by software as in the first to fourth embodiments. When the control data is detected from the control area, the data received in the copy source time slot designated by the control data is changed to be received in the copy destination time slot (B. S4),
Control is performed to open (make empty) the copy source area (at step S5).

FIG. 22 shows an example of control data representing duplication, which is used when the duplication data is transmitted from the multiplexing unit 2. This control data is part of the header or three time slots (3 x 8 bits) in a specific data area.
The first 4 bits of the 8 bits of the first slot are set to a specific code “0101” to indicate that the data is duplicated. The subsequent 4 bits and the total of 10 bits from the first 6 bits of the second slot indicate the time slot number of the copy destination, and the total of 2 bits at the rear of the second slot and 8 bits of the third time slot. 10
This bit indicates the time slot number of the copy source.

In the example of the time chart shown in FIG. 21,
In the frame shown in Fig. 10, the terminal station a that used the time slot of number 10 is removed and becomes empty, and the same data length (time slot length) and the same data length (c1) as this terminal station a are obtained.
The data of the time slot of the subsequent number 13 having is copied. Specifically, the data of the time slot number 13 is copied to the copy memory 29 of FIG.
The contents of the copying memory 29 are read at the timing of. In this way, the data c1 is set in both the time slots 10 and 13 so as to be overlapped and transmitted as shown in FIG. In the time slots 7 to 9 of this frame, the control data shown in FIG. 22 indicates that the data is duplicate data, the copy source is the time slot number 13, and the copy destination is the time slot number 10. The bit string is set and becomes “50280 Dh” in hexadecimal display. When this frame is transmitted a predetermined number of times, as shown in FIG. 21, the data area of the copy source (time slot of number 13) is released and made empty.

According to the embodiment corresponding to the fifth principle of the present invention, even if a region (time slot) in a tooth-cutting state occurs due to removal of a terminal station or the like, another region of the terminal station having the same data length is generated. By copying and changing the time slot, it is possible to reduce the occurrence of tooth removal.

(Supplementary Note 1) In a time division multiplex transmission apparatus for transmitting transmission data including transmission data in each of a plurality of time slots, detection means for detecting that the time slot used for transmission of transmission data has become empty And when the vacant time slot is not adjacent to another vacant time slot, the time slot assignment is changed so that the vacant time slot is adjacent to another vacant time slot. A time division multiplex transmission apparatus comprising: a changing unit.

(Supplementary Note 2) In a time division multiplex transmission apparatus that multiplexes and transmits a plurality of terminal station data having different transmission rates, a specific code is inserted into an empty time slot generated due to removal of a terminal station in a frame. And a means for refilling other terminal station data in the time slot after the insertion of the specific code, the specific code detecting means for detecting the specific code, and the specific code by the specific code detecting means. A time division multiplex transmission device characterized in that the receiving side is provided with a data area updating means for updating the detected time slot as another terminal station data when detected.

(Supplementary Note 3) In Supplementary Note 2, the transmission of the specific code from the transmitting side is performed by a predetermined number of plural frames, and the receiving side receives a predetermined plural number of frames so that the idle time is A time division multiplex transmission device characterized by being distinguished from a slot.

(Supplementary Note 4) In a time division multiplex transmission apparatus that multiplexes and transmits a plurality of terminal data having different transmission rates, a control data area is provided in a frame, and when a free time slot occurs, the control data area is generated. Control data setting means for setting and transmitting the position and length of an empty time slot by means of, and means for refilling the empty time slot with other terminal station data after transmitting the frame set by the control data setting means. Is provided on the receiving side, the control data detecting means for detecting the control data, and the data for updating the corresponding time slot position and length as other terminal station data when the control data is detected by the control data detecting means. A frame control method for a time division multiplex transmission device, characterized in that area updating means is provided on the receiving side.

(Supplementary Note 5) In a time division multiplex transmission apparatus that multiplexes and transmits a plurality of terminal station data having different transmission rates, a specific code is inserted into an empty time slot generated due to removal of a terminal station in a frame. Means for writing the entire frame in which the empty time slot is refilled with data of another terminal to the memory, and switching timing is set as control data after the insertion of the specific code. The transmitting side is provided with means for selecting to transmit the frame of the memory written by the writing means, the specific code detecting means for detecting the specific code, and the time slot in which the specific code is detected is the data of the subsequent time slot. Refill change control means for writing the refilled frame in the memory, and the switching timing. A time-division multiplex transmission device, comprising: selecting means for selecting and separating the memory in which the refilled frame is written by detecting control data.

(Supplementary Note 6) In Supplementary Note 1, when a plurality of these empty time slots are used to allocate to a new terminal station in a state where there are scattered empty time slots, each empty time slot assigned as control data. The control data setting means for setting the data indicating the position of the control data is provided on the transmission side, the control data detecting means for detecting the control data, and each end based on the data of each assigned time slot position set in the control data. A time division multiplex transmission device, characterized in that a data area updating means for updating station data is provided on the receiving side.

(Supplementary Note 7) In a frame control system of a time division multiplex transmission apparatus for multiplexing and transmitting a plurality of terminal data having different transmission rates, when an empty time slot occurs and a missing tooth state occurs, the empty It includes copy data setting means for copying data of another time slot having the same length as the time slot as a copy source and the empty time slot as a copy destination, and position information of the copy source and copy destination to be transmitted as control data. Duplication control data setting means for generating data is provided on the transmission side, duplication control data detection means for detecting the duplication control data, and the detected data area of the copy source terminal station are allocated and updated at the copy destination position. A time division multiplex transmission apparatus comprising: a data area updating unit.

(Supplementary Note 8) In Supplementary Note 7, the transmission side is provided with a data area releasing means for releasing the time slot of the copy source to make it empty after the transmission of the duplicate control data from the duplicate control data setting means. A time division multiplex transmission device characterized by:

(Supplementary Note 9) In any one of Supplementary Notes 4 to 8, the control data is provided in either the header area of the frame or a part of the data area.

[0072]

According to the present invention, even if a non-contiguous empty area of a frame occurs during the operation of a time division multiplexing transmission apparatus,
It is possible to change to a continuous unused area without interrupting the transmission of the operating terminal station, and it is easy to add a new terminal station.

In particular, according to the first principle configuration of the present invention, the transmitting side and the receiving side can refill the empty area together with another data area by notifying the other party by the code that the empty area has been reached. Further, according to the second principle configuration, it is possible to refill faster than the first principle configuration by displaying the empty area with the control data.

According to the third principle configuration of the present invention, by storing the data in which the tooth-removed state is improved in advance in the memory, it becomes possible to switch all at once at the switching timing, and when a plurality of tooth-removed areas occur irregularly. The repeated operation can be shortened to one time.

According to the fourth principle configuration of the present invention, even if the empty areas exist discontinuously, it is easy to divide and allocate the area of the terminal station using a plurality of areas to the tooth removal area. be able to. Further, according to the fifth principle configuration of the present invention, when a region in a tooth-cutting state occurs, by copying the data region of another subsequent time slot of the same length,
It is possible to eliminate the toothless state without interrupting the transmission.

[Brief description of drawings]

FIG. 1 is a diagram showing a first principle configuration of the present invention.

FIG. 2 is a diagram showing a second principle configuration of the present invention.

FIG. 3 is a diagram showing a third principle configuration of the present invention.

FIG. 4 is a diagram showing a fourth principle configuration of the present invention.

FIG. 5 is a diagram showing a fifth principle configuration of the present invention.

FIG. 6 is a diagram showing a first configuration of the embodiment.

FIG. 7 is a diagram showing a first time chart of the example.

FIG. 8 is a diagram showing an example of a fixed pattern representing an empty area.

FIG. 9 is a diagram showing a first flowchart of the embodiment.

FIG. 10 is a diagram showing a second time chart of the example.

FIG. 11 is a diagram showing an example of control data for slot designation.

FIG. 12 is a diagram showing a second flowchart of the embodiment.

FIG. 13 is a diagram showing a second configuration of the embodiment.

FIG. 14 is a diagram showing a third time chart of the embodiment.

FIG. 15 is a diagram showing an example of control data of a fixed pattern and switching timing.

FIG. 16 is a diagram showing a third flowchart of the embodiment.

FIG. 17 is a diagram showing a fourth flowchart of the embodiment.

FIG. 18 is a diagram showing a fourth time chart of the example.

FIG. 19 is a diagram showing an example of control data for slot designation.

FIG. 20 is a diagram showing a third configuration of the example.

FIG. 21 is a diagram showing a fifth time chart of the example.

FIG. 22 is a diagram showing an example of control data representing duplication.

FIG. 23 is a diagram showing a fifth flowchart of the embodiment.

FIG. 24 is a configuration diagram of a conventional example.

FIG. 25 is a diagram showing a timing of a signal on a multiplex transmission path and a frame structure.

[Explanation of symbols]

1 Multiplex transmission equipment 10 Transmitter 10a Free space detection means 10b Specific code insertion means 10c Data area refilling means 11 Receiver 11a Specific code detecting means 11b Data area updating means

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Kenichi Kawazoe             3-22-8, Hakata Station, Hakata-ku, Fukuoka City, Fukuoka Prefecture             Issue Fujitsu Kyushu Digital Technology Co., Ltd.             Inside the company F term (reference) 5K028 AA11 KK01 KK03 LL02 MM12                       RR02

Claims (5)

[Claims] 1. A time-division multiplex transmission apparatus for transmitting transmission data by including transmission data in each of a plurality of time slots, and detecting means for detecting that the time slot used for transmission of transmission data has become empty. Changing means for changing time slot assignment so that when an empty time slot is not adjacent to another empty time slot, the empty time slot is adjacent to another empty time slot And a time division multiplex transmission device comprising: 2. A time division multiplex transmission apparatus for multiplexing and transmitting a plurality of terminal station data, means for inserting a specific code into an empty time slot, and another terminal station in the time slot after the insertion of the specific code. A time division multiplex transmission device characterized in that a means for refilling data is provided in a transmission section. 3. A time-division multiplex transmission apparatus for multiplexing and transmitting a plurality of terminal data, and a specific code detecting means for detecting a specific code, and a search when the specific code is detected by the specific code detecting means. A time division multiplex transmission device, characterized in that the receiving section is provided with a data area updating means for updating the generated time slot as other terminal station data. 4. In a time division multiplex transmission device for multiplexing and transmitting a plurality of terminal data having different transmission rates, empty time slots are scattered,
When allocating to a new terminal station using a plurality of these empty time slots, the transmitting section is provided with control data setting means for setting data representing the position of each allocated empty time slot as control data, A control data detecting means for detecting and a data area updating means for updating each terminal station data based on the data of each allocated time slot position set in the control data are provided in the receiving section. Division multiplexing transmission equipment. 5. The empty time slot according to claim 1, when the empty time slot is generated and a missing tooth state occurs, the data of another time slot having the same length as the empty time slot is used as a copy source and the empty time slot is a copy destination. Duplication control for detecting the duplication control data by providing copy data setting means for copying as the control data and duplication control data setting means for generating data including position information of the copy source and the copy destination to be transmitted as control data, and detecting the duplication control data. A time division multiplex transmission device comprising a data detecting means and a data area updating means for allocating and updating a detected data area of a terminal station of a copy source to a position of a copy destination.