JPH0650846B2 - Frame information changing method for time division multiplex communication system - Google Patents

Description

Description: TECHNICAL FIELD OF THE INVENTION The present invention relates to a time division multiplex communication system, and in particular, changes frame information designating a correspondence relationship between a plurality of low speed terminals and each channel of a transmission frame of a high speed line. The improvement of the method for doing.

[Technical background of the invention]

In recent years, as one of data communication systems, for example,
As shown in the figure, a plurality of low speed terminals 11 to 1n are connected to the low speed line 21.
.About.2n to connect to the time division multiplex communication device 3, this time division multiplex communication device 3 is connected to another similar time division multiplex communication device 3'through the high speed line 4, and each low speed terminal 11 to 11. As shown in FIG. 6, the 1n data is transmitted to the plurality of channels CH1 to CHn in one frame by the time division multiplex communication apparatus 3.
There is known a system in which time-division multiplex transmission is performed by allocating each to the. FIG. 7 shows an example of the configuration of the time division multiplex communication apparatus 3. The time division multiplex communication apparatus 3 includes a transmission multiplex processing unit 3a, a reception multiplex processing unit 3b, and these processing units 3a. , 3b and the low-speed terminals 11 to 1n for connecting the low-speed line connection adapter 3c
1 to 3 cn, low speed terminals 11 to 1 n and channel CH1
To CHn, a frame information storage unit 3d that stores frame information that specifies the corresponding relationship, and a communication control unit 3e that controls the above units. Since the time division multiplex communication device 3'has the same configuration as the time division multiplex communication device 3 described above, the same reference numerals are given and the description thereof is omitted.

In such a configuration, when transmitting data, the time division multiplex communication device 3 reads frame information from the frame information storage unit 3d in synchronization with a transmission clock for the high speed line 4, and each low speed line connection adapter 3c1 according to the frame information. 3 to 3cn are sequentially set to the receiving operation state from the one corresponding to the transmission channel CH1 to receive the transmission data from each low speed terminal 11 to 1n, and the transmission multiplexing processing unit 3a transmits these transmission data to the corresponding channel CH1 to CH1 of the frame.
It is transmitted to the high speed line 4 by being assigned to CHn. On the other hand, in the case of receiving data, every time a frame is received from the time division multiplex communication device 3'on the other side, corresponding low-speed line connection is sequentially performed from the reception channel CH1 according to the frame information stored in the frame information storage unit 3d. Adapter 3
Select c1 to 3cn, and each receive channel CH
The data assigned to 1 to CHn are distributed to the corresponding low speed line connection adapters 3c1 to 3cn and sent from the low speed line connection adapters 3c1 to 3cn to the low speed terminals 11 to 1n via the low speed lines 21 to 2n. .

By the way, in this type of system, it may be necessary to change the correspondence between the channels CH1 to CHn of the frame and the low speed terminals 11 to 1n during operation, for example, when the speed of the low speed terminal is changed or the number of terminals is increased. However, in such a case, conventionally, the frame information is changed as follows.
That is, one is to change each time division multiplex communication device 3,
The communication operation of 3'is temporarily stopped, and in this state, the operator rewrites the frame information of the frame information storage unit 3d to a new one for each time division multiplex communication device 3, 3 '. The operator rewrites the frame information in the frame information storage unit 3d for each of the time division multiplex communication devices 3 and 3'while maintaining the operating state of each time division multiplex communication device 3 and 3 '. That is, the conventional frame information is changed in each time division multiplex communication device 3,
3'independently.

[Problems of background technology]

For this reason, the system must be stopped every time the frame information is changed, which causes a decrease in operational efficiency, and the change timing does not match between the time division multiplex communication devices 3 and 3 '. However, the problem that the data assigned to an arbitrary channel on the transmitting side reaches the other low-speed terminal on the receiving side is likely to occur, and the reliability of data transmission is extremely low.

[Object of the Invention]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a frame information changing system for a time division multiplex communication system capable of efficiently and accurately changing frame information without stopping communication operation and without causing erroneous data transmission. .

[Outline of Invention]

In order to achieve the above object, the present invention provides, in each time division multiplex communication device, first storage means for storing frame information in use, and new frame information desired to be changed into the frame information in use. And a second storage unit for storing separately, and when a frame information change instruction is issued, the frame information change instruction information is inserted into a specific channel in the frame and transmitted, and the change instruction information is transmitted. When it arrives or when there is an instruction to change the above frame information,
The frame information is changed from that of the first storage unit to that of the second storage unit in each of the predetermined number of frames for each transmission and reception, and thereafter, data allocation is performed according to the changed frame information. The frame information can be changed in synchronization between the time division multiplex communication devices.

Example of Invention

FIG. 1 shows a configuration of a time division multiplex communication device to which a frame information changing system according to an embodiment of the present invention is applied.
The same parts as those in FIG. 7 are designated by the same reference numerals.

The transmission multiplex processing unit 3a and the reception multiplex processing unit 3b are respectively provided with first storage units 3f and 3h and second storage units 3g and 3i, which are RAMs. The first storage units 3f and 3h and the second storage units 3g and 3i
Respectively store the frame information in use and new frame information desired to be changed, and the communication control unit 3
It is selectively accessed by j.

By the way, the communication control unit 3j has various functions as shown in FIG. That is, the function is the multiplexing control means 3 for controlling the operation of the transmission multiplex processing unit 3a and the reception multiplex processing unit 3b, respectively, to multiplex the transmission data of each of the low speed terminals 11 to 1n and reproduce the received data.
1, frame information transmission control means 32 for transmitting this frame information to the other party's time division multiplex communication device when new frame information to be changed is input, and new frame information to be changed. 2 storage units 3g, 3
i, frame information storage control means 33, change instruction information transmission control means 34 for transmitting frame information change instruction information to the other time division multiplex communication apparatus, and frame information when a frame information change instruction is issued. Is a frame information switching control means 35 for switching from the one stored in the first storage units 3f and 3h to the one stored in the second storage units 3g and 3i in the predetermined frame.

Next, the frame information changing method of this embodiment will be described based on the above configuration. Note that here, the frame information A (third
FIG. 3A is stored in each of the first storage units 3f and 3h, and the case where the frame information is changed from this state to B shown in FIG. 3B will be described as an example.

For example, in the time division multiplex communication device 30, when the operator gives an instruction to change the frame information using an input operation unit (not shown) and accordingly inputs new frame information B,
The communication control unit 3j first sets the new frame information B to the fourth
Control channel C in transmission frame a as shown in FIG.
It is inserted into H0 and transmitted to the other party's time division multiplex communication device 30 ', and the new frame information B is added to the second storage unit 3'.
It is stored in g and 3i respectively. On the other hand, when the communication control unit 3j recognizes that the frame information B is inserted in the control channel CH0 in the received frame a, the time division multiplex communication device 30 'stores this frame information B in the second storage unit 3g. , 3i, respectively.

When the storage and transmission of the new frame information B is completed as described above, the communication control unit 3 of the time division multiplex communication device 30.
j sets the transmission frame information change instruction bit I _S and the reception frame change instruction bit I _R set in the control channel CH0 in the subsequent transmission frame b1 to “1”, respectively, as shown in FIG. 4 (b). That is, the change instruction information indicating that the frame information is changed is transmitted to the time division multiplex communication device 30 'on the other side. Then, from the frame b2 next to the frame b1 which transmitted this change instruction information, the frame information is switched from A of the first storage unit 3f to B of the second storage unit 3g and stored in the second storage unit 3g. According to the new frame information B (FIG. 3 (b)), the transmission data D1 of the low speed terminals 11, 1x, 14, ...
1, D1x, D14, ..., D1n are assigned and transmitted. The transmission data is assigned by the communication control unit 3j as in the conventional case.
Then, the low-speed line connection adapters 3c1 to 3cn are sequentially put into the receiving operation state according to the frame information.

On the other hand, the communication control unit 3 of the time division multiplex communication device 30 'on the other side
j monitors the transmission frame change instruction bit I _S and the reception frame change instruction bit I _R set in the control channel CH0 of the reception frame b1, and the reception frame change instruction bit I _R is “1”. If it is detected, it is determined that an instruction to change the frame information of the received frame has been issued, and the frame information of the next received frame b2 is switched from that of the first storage unit 3h to that of the second storage unit 3i. , The received data D assigned to the respective channels CH1 to CHn according to the new frame information B thereafter.
11, D1x, D14, ..., D1n are assigned to low speed terminals 11, 1x, 1
4, ..., 1n are distributed. At the same time, the communication control unit 3j sets the transmission frame change instruction bit I _S to “1”.
When it is detected that is, the received frame change instruction bits I _R is set to the control channel CH0 of a transmission frame c1 as shown in FIG. 4 emits an instruction to transmit the multiplex processing section 3a (c) "1" And That is, the change instruction information is returned to the time division multiplex communication device 30. Then, from the next transmission frame c2, the frame information is switched from that of the first storage unit 3f to that of the second storage unit 3g, and thereafter, according to this new frame information B, each transmission channel as shown in FIG. Low speed terminals 11, 1x, 1 for CH1 to CHn
4, ..., 1n transmission data D11, D1x, D14, ..., D1n
Assign

On the other hand, the time division multiplex communication device 30 monitors the reception frame change instruction bit I _R of the reception frame c1 coming from the time division multiplex communication device 30 'and detects that this bit I _R is "1". Then, the time division multiplex communication device 3
It is determined that the change of the transmission frame information on the 0'side has been completed, and the frame information of the subsequently received frames is switched from that of the first storage unit 3h to that of the second storage unit 3i. The received data is distributed according to the frame information B. Thus, each time division multiplex communication device 3
The change of the frame information of the transmission frame and the reception frame of 0, 30 'is completed.

In this way, according to this embodiment, each time division multiplex communication device 3
0 and 30 'are provided with first storage units 3f and 3h for storing the used frame information A for transmission and reception and storage units 3g and 3i for storing new frame information B, and each time division multiplex communication device 30. , 30 ', the change instruction information of the frame information is transmitted and received, and the access to the first and second storage units is switched according to the timing, so that the time division multiplex communication devices 30, 30' are always connected. The frame information can be changed while synchronizing. Therefore, it is possible to surely eliminate the problem that the transmission timing is erroneously transmitted to another low-speed terminal because the timing of changing the frame information does not match between the time division multiplex communication devices 30 and 30 '.
As a result, the reliability of transmission can be significantly improved. Further, since it is not necessary to stop the time division multiplex communication devices 30 and 30 'when changing the frame information, there is an advantage that the operational efficiency of the system is not deteriorated.

The present invention is not limited to the above embodiment. For example, in the above embodiment, the frame information of the time division multiplex communication device 30 is changed only when the change instruction information is transmitted, and is received when the change instruction information is returned from the other time division multiplex communication device 30 '. Although the frame is changed, the transmission frame and the reception frame may be changed at preset change timings when the change instruction information is transmitted. By doing so, it is not necessary to return the change instruction information from the time division multiplex communication device 30 'side, and the load on the communication control unit can be reduced accordingly. Further, in the above embodiment, the first storage unit and the second storage unit are configured by different memories.
It may be provided by dividing the storage area of each memory. In addition, the transmission means of the change instruction information, the change timing of the frame information, the control procedure and the control content of the communication control unit, and the like can be variously modified and implemented without departing from the scope of the present invention.

〔The invention's effect〕

As described above in detail, according to the present invention, in each time division multiplex communication apparatus, the first storage means for storing the frame information in use and the new frame information desired to be changed are added to the in-use frame information. And a second storage unit for storing separately, and when a frame information change instruction is issued, the frame information change instruction information is inserted into a specific channel in the frame and transmitted, and the change instruction information is transmitted. When it arrives or when there is an instruction to change the frame information, the frame information is changed from that of the first storage unit to that of the second storage unit for each of the predetermined frames for each transmission and reception. By assigning data according to the later frame information, and by changing the frame information in synchronization with each other among the time division multiplex communication devices, Without stopping the communication operation, and it is possible to provide a frame information change method when division multiplexing communication system may perform efficiently and accurately change frame information without causing erroneous data transmission.

[Brief description of drawings]

FIGS. 1 to 4 (a) to (c) are for explaining a frame information changing method in one embodiment of the present invention.
FIG. 1 is a circuit block diagram showing a configuration of a time division multiplex communication device to which the same system is applied, FIG. 2 is a block diagram showing a functional configuration of a communication control unit of the device, and FIGS. 3 (a) and 3 (b). Is a schematic diagram showing an example of frame information before and after change, respectively.
(A) to (c) are schematic diagrams showing a frame structure of data transmitted between respective time division multiplex communication devices, and FIG. 5 is a block diagram showing a structure of a general time division multiplex communication system, FIG. 6 is a schematic diagram showing a frame structure of transmission data, and FIG. 7 is a circuit block diagram showing a structure of a time division multiplex communication device to which a conventional frame information changing system is applied. 11-1n ... low speed terminal, 21-2n ... low speed line, 3
0, 30 '... Time division multiplex communication device, 3a ... Transmission multiplex processing unit, 3b ... Reception multiplex processing unit, 3c1 to 3cn
...... Low speed line connection adapter, 3f, 3h ...... First storage unit, 3g, 3i ...... Second storage unit, 3j ...... Communication control unit, 31 ...... Multiplexing control means, 32 ...... Frame information transmission Control means 33 ... Frame information storage control means 34
...... change instruction information transmission control unit, 35 ...... frame information switching control means, channels CH1 through CHn ...... data transmission, CH0 ...... control channel, _{I S} ...... transmission frame change instruction bits, _{I R} ...... received Frame change instruction bit.

Claims (2)

[Claims] 1. Time division multiplexing for allocating data of each of said low speed terminals to preset channels and composing and transmitting a frame by these channels between time division multiplex communication apparatuses to which a plurality of low speed terminals are connected. In the communication system, first storage means for storing in-use frame information designating a correspondence relationship between each low-speed terminal and each channel, and new frame information desired to be changed, in each of the time division multiplex communication devices. And a change instruction information transmission control means for inserting the change instruction information into a specific channel in the frame and transmitting it when there is an instruction to change the frame information. And when the instruction to change the frame information is given or the change instruction information is inserted into a specific channel of the frame coming from the other time division multiplex communication device. The frame information is switched from the first storage means to the second storage means from the predetermined number of frames during transmission / reception, and thereafter data is assigned to the channels according to the new frame information. A frame information changing system for a time division multiplex communication system, characterized in that a change control means is provided. 2. The change instruction information transmission control means and the frame information change control means insert the change instruction information into a transmission frame immediately after a frame information change instruction is transmitted, and transmit the change instruction information. The frame information is changed from the transmission frame next to the inserted frame. On the other hand, when the change instruction information is received, the frame information is changed from the received frame next to this frame information, and the transmission is performed immediately after receiving the change instruction information. When the change instruction information is inserted and returned, the frame information is changed from the transmission frame next to the frame in which the change instruction information is inserted, and when the change instruction information is returned, the reception frame next to the frame is changed. The time division multiplex communication system according to claim (1), wherein the frame information is changed. Frame information change method of.