JP3064995B2 - Data transmission method and recording medium storing program for causing computer to execute the method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a data transmission method and a recording medium on which a program for causing a computer to execute the method is recorded, and more particularly to a data transmission method for transmitting a group of information composed of multi-frames. is there.

[0002]

2. Description of the Related Art Hitherto, a method has been adopted in which information composed of a bit string having a fixed length is formed by patterning a bit data string by using a multi-frame and transmitting the state information. What is being done is done.

FIG. 7 is a diagram for explaining an example of such a multi-frame. Each channel (C) in the 2M highway is shown in FIG.
It is an example of the multi-frame of the state management signal of H). FIG.
(A) is a format diagram of a multi-frame.
To an eighth frame, and each frame is composed of 30 time slots TS0 to TS30. Each of these time slots has an 8-bit configuration.

The first time slot TS0 of each frame
Is a group of information that is an object of the present invention. In this example, FIG. 7B shows details of the group of information. FIG.
In (B), each of the arithmetic numerals indicates a channel number, and a bit portion indicated by the channel number includes:
The time slot assigned to the channel (FIG. 7
These bits indicate whether the time slots indicated by CH1 to CH30 in (A) are currently in use ("1") or empty ("0").

[0005] F, F is a multi-frame identification number,
F = 1 and F = 0, respectively, and the multi-frame identification number is repeated in units of eight frames.
In addition, a transmission path failure notification bit is inserted.

The data of a total of 64 bits of the 8-multiframe structure shown in FIG. 7B is a group of state information (state management signals of each channel). This state information is stored in an information table in each communication device. By providing and changing the bit data in the table, the correspondence table in each communication device connected via the transmission path is repainted, so that it appears as static data at first glance, so that information processing is easy, so Being used .

However, the information transmission path is often in units of bytes, and when information is composed of bit strings that straddle bytes as in the above-described example, the information constitutional unit does not change at the same time, so that the information is expected. A data pattern is detected.

In order to cover such a drawback, a method of separating a reception buffer and an information table from each other is adopted on the reception side, and the transmission side uses all bits constituting a multi-frame as shown in FIG. 8B, two buffers 91 and 92 are provided, and as shown in FIG. 8B, the buffer on the side not being read is selected as being repainted by the write selector 94, and the pattern No. 1 is maintained.

The pattern No. During state 1, data constituting a new multiframe is written for all bits. When the writing is completed, the state of repainting is released, and the pan No. is synchronized with the switching synchronization pulse which indicates that transmission of all bits is completed. A method of switching to the state 2 is adopted. Incidentally, 93 is a read selector, and 95 is a transmission unit.

[0010]

In the method of FIG. 8, as described above, the number of bits constituting a multi-frame is determined in advance, and the state during transmission is always grasped by hardware to synchronize. It is necessary to incorporate the function as hardware, and the function tends to be complicated and large.

When constructing a multi-frame,
A method that can take an arbitrary number of bits for the number of bits that make up a multi-frame, even if dedicated hardware is not necessarily prepared, is flexible in terms of miniaturization and design specifications for system construction. It is also desired from the aspect of the selection decision method. However, as described above, general-purpose hardware has a similar disadvantage because most of the hardware is good at processing in units of bytes.

An object of the present invention is to provide a data transmission system capable of transmitting information of a multi-frame configuration accurately and without error by software control without using special hardware that causes complexity and enlargement. An object of the present invention is to provide a recording medium storing a method and a control program of the method.

[0013]

According to the present invention, there is provided a data transmitting method for temporarily storing a group of data in a storage means and sequentially transmitting the stored data, wherein the group of data is constituted. A first step of preparing first and second storage areas each having a capacity equal to the bit length to be stored in the storage means and storing the group of data in the first storage area; A second step of transmitting the data stored in the first storage area while reading the data in response to the first storage area in response to a change in the information in the group of data resulting in a change in the bit content. A third step of copying the storage data of the area to the second storage area and rewriting bits of the second storage area corresponding to a changed location; and storing the data of the second storage area. A fourth step of transmitting the data while sequentially reading the data and copying the storage data of the second storage area to the first storage area; and, when all the storage data of the second storage area have been read, A fifth step of transmitting the stored data of the first storage area later while sequentially reading the data, thereby obtaining a data transmission method.

According to the present invention, there is provided a recording medium storing a program for causing a computer to execute a data transmission method for temporarily storing a group of data in a storage means and sequentially transmitting the stored data. A first and a second storage area each having a capacity equal to a bit length constituting the group of data are prepared in the storage means, and the group of data is stored in the first storage area. (1) a second step of sequentially reading and transmitting data stored in the first storage area in response to an information transmission request; and (2) changing information in the group of data to change a bit content. In this case, the storage data of the first storage area is copied to the second storage area, and a bit of the second storage area corresponding to a changed portion is rewritten. A third step of transmitting the stored data of the second storage area while sequentially reading the stored data, and copying the stored data of the second storage area to the first storage area; And a fifth step of transmitting the stored data of the first storage area after the copying while sequentially reading out all the stored data in the second storage area. A recording medium is obtained.

The operation of the present invention will be described. First and second storage areas having a capacity equal to the total bit length of a multi-frame are prepared, and all bits of a multi-frame to be transmitted are stored in the first storage area. Then, the data in the first storage area is sequentially read out and transmitted cyclically until there is a bit change, and when there is a bit change, the data in the first storage area is copied to the second storage area at that time. Then, the corresponding bit of the second storage area after the copy is changed.

Thereafter, when it is detected that the data in the second storage area has been transmitted while being sequentially read, the data in the second storage area is copied to the first storage area. When all the data in the second storage area has been read after the copy, the data in the first storage area is transmitted while being read cyclically. By repeating the above processing, it is possible to transmit a group of data constituting a multi-frame simply by software processing without error without using special hardware.

[0017]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a schematic system block diagram to which an embodiment of the present invention is applied. FIG. 1 shows an example in which data transmission is performed between two communication devices 1 and 2 via a transmission line 3. Each of the devices 1 and 2 has the same configuration. The reference numeral indicates the same number in the ones place. If only the communication device 1 is described for simplicity, a CPU (information processing unit) 11 and a ROM
(Read only memory) 12, RAM (random access memory) 13, transmitting unit 14, and receiving unit 15
The configuration is such that they are interconnected by an internal common bus 16.

The ROM 12 is a read-only memory in which a processing program for controlling the processing operation of the CPU 11 is stored in advance, and in this embodiment, a recording medium in which the flowcharts of FIGS. It is assumed that

The operation of the embodiment of the present invention will be described with reference to the flowcharts of FIGS. 2 to 5 and FIG. FIG. 6 is a schematic diagram for explaining a state change of the information storage area in the RAM 13 or 23 in FIG.

First, the initial setting operation will be described with reference to FIG. An information storage area is secured in the RAM (step S1). In this case, at least two storage areas 61 and 62 (see FIG. 6A) having a capacity equal to the total bit length of the multiframe are secured. FIG.
In the multi-frame configuration of FIG. 7, as shown in FIG.
8 × 8 = storage area 61 having a capacity corresponding to 64 bits,
62 are secured.

Next, the head address storage area 63 and the tail address storage area 64 of the first storage area 61 are secured (steps S2 and S3). Further, an address counter storage area 65 for determining a read address is secured (step S4).

Then, the lowest value of the first storage area is set in the head address storage area 63 (step S).
5). Further, the oldest value of the first storage area, that is, a value corresponding to 8 × 8 = 64 bits in this example, is set in the tail address storage area 64 (step S5). Then, the count value of the address counter storage area 65 is cleared to 0 (step S7). Although not shown, a group of data to be transmitted in this state (8 × 8 = 64)
Bit data) is written in the first storage area 61, and this state is indicated by oblique lines in FIG.

Next, the transmission control starts as shown in FIG. 3 (step S8). In response to the transmission information request (step S9), data of an address corresponding to "head address value + address counter value" is extracted. It is transmitted (step S10). Then, the value of the address counter 65 is incremented by "+1" (step S11).

The above steps S9 to S11 are repeated until there is a change in the contents of the transmission data (step S12). Therefore, the read address of the first storage area 61 is as shown in FIG.
As shown by 66 in (B), it changes cyclically from the head address to the tail address. The address counter 6
5 is of course cleared to 0 when "head address value + address counter value" exceeds the tail address.

When the transmission data is changed, as shown in FIG. 6C, all the data in the first storage area 61, that is, all the storage data from the head address to the tail address are stored in the second storage area 62. The copying process is performed in parallel with the reading (step S13). This copy processing can use a well-known copy technique. After copying, as shown in FIG. 6D, the second
Is rewritten in the bit portion 67 of the storage area 63 (step S14). Then, as shown in FIG.
The second storage area 6 which is a copy area for the tail address value
It is changed to the final address value of 2 (shown as 64 ') (step S15).

If there is a request for transmission information (step S16), data of an address obtained from "head address value + address counter value" is extracted and transmitted (step S17), and the value of the address counter 65 becomes "+".
1 "is incremented (step S18). This state is performed until the address counter value exceeds the maximum value (a value indicating a capacity equal to the total bit length constituting the multiframe) (step S19), and the read address is indicated by 68 in FIG. 6 (F). Will change.

When the address counter value exceeds the maximum value, all data in the second storage area 62, which is a copy area, is shifted from the head address to the center address (the first storage area) as shown in FIG. The data is copied to the area up to the tail address of the area 61), that is, the first storage area 61 (step S20).

If there is a request for transmission information (step S21), data of an address obtained from "head address value + address counter value" is extracted and transmitted (step S22), and the value of the address counter 65 becomes "+".
1 "is incremented (step S23).

When the "head address value + address counter value" exceeds the tail address, the tail address value becomes the central address (corresponding to the tail address of the first storage area 61) as shown in FIG. (Step S25). Thereafter, the address counter 6
The content of 5 is cleared to 0 (step S26), the process returns to step S9 of FIG. 3, and the same operation is sequentially repeated thereafter. Thus, storage of the information for the new multi-frame would visit are the following, it is to be provided to the delivery process.

In the above embodiment, an example is described in which the present invention is applied to the multi-frame of the state management signal of each channel on the 2M highway shown in FIG. 7, but as shown in FIG.
PIAFS (PHS INTERNET ACCESS FORUM STAN), a communication protocol of HS (Personal Handy Phone System)
Signal DARD), since it is possible to obtain置替multiframe signal transmission <br/> receive 640 bits, it is clear that also the signal of the PIAFS is applicable as well.

In FIG. 9, FI is FRAME IDENTIFI.
ER, FFI is FEED FOWARD INFORMATION, FBI is FEED BACK INFORMATION, and FC
S indicates FRAME CHECK SEQUENCE.

[0033]

As described above, according to the present invention, FIG.
As shown in the above, since a general-purpose system configuration can be used as it is, when transmitting and receiving information of a multi-frame configuration, it is only necessary to change the software which is the processing procedure of the CPU, and therefore, the program which is the software By exchanging only the ROM in which is stored, it is possible to extremely easily perform the bit change erroneous transmission prevention type of data transmission, which has the effect of reducing the size and cost of the device.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a system block to which an embodiment of the present invention is applied.

FIG. 2 is a part of a flowchart showing the operation of the embodiment of the present invention.

FIG. 3 is a part of a flowchart showing the operation of the embodiment of the present invention.

FIG. 4 is a part of a flowchart showing the operation of the embodiment of the present invention.

FIG. 5 is a part of a flowchart showing the operation of the embodiment of the present invention.

FIG. 6 is a diagram showing a state change of a data storage area during operation of the embodiment of the present invention.

FIG. 7 is a diagram showing an example of a multi-frame signal format to which the present invention is applied.

FIG. 8 is a system block diagram for explaining a conventional technique.

FIG. 9 is a diagram showing another example of the format of a multi-frame signal to which the present invention is applied.

[Explanation of symbols]

 1, 2 Communication device 11, 21 CPU 12, 22 ROM 13, 23 RAM 14, 24 Transmitter 15, 25 Receiver 16, 26 Internal bus 61 First storage area 62 Second storage area 63 Head address storage area 64 , 64 'Tail address storage area 65 Address counter storage area

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H04J 3/00-3/26 H04L 29/00-29/14

Claims (6)

(57) [Claims] 1. A data transmission method for temporarily storing a group of data in a storage means and sequentially transmitting the stored data, wherein each of the groups has a capacity equal to a bit length constituting the group of data. A first step of preparing first and second storage areas in the storage means and storing the group of data in the first storage area; and a first storage area in response to an information transmission request. A second step of sequentially reading and transmitting stored data of the first storage area, and when information in the group of data is changed and bit contents are changed, the stored data of the first storage area is stored in the second storage area. A third step of copying the data to the area and rewriting bits of the second storage area corresponding to the location where the change has occurred; and transmitting the data stored in the second storage area while sequentially reading the data. A fourth step of copying data stored in the second storage area to the first storage area; and when all the storage data in the second storage area have been read, the first A fifth step of transmitting the data stored in the storage area while sequentially reading the stored data. 2. In each of the second, fourth and sixth steps, reading of the stored data is performed while sequentially changing the read address by updating control of the count content of an address counter. The data transmission method according to claim 1. 3. The method according to claim 2, wherein in each of the second and sixth steps, the count value of the address counter circulates between a head address and a tail address of the first storage area. The data transmission method according to claim 2. 4. The method according to claim 4, wherein in the fourth step, the count value of the address counter is configured to circulate between a head address of the first storage area and a tail address of the second storage area. 4. The data transmission method according to claim 2, wherein: 5. The data transmission of the group of data according to a multi-frame method.
Any of the data transmission methods described above. 6. A recording medium storing a program for causing a computer to execute a data transmission method for temporarily storing a group of data in a storage means and sequentially transmitting the stored data, wherein the group of the group of data is stored in a storage medium. A first step of preparing first and second storage areas each having a capacity equal to a bit length constituting data in the storage means and storing the group of data in the first storage area; A second step of sequentially reading and transmitting stored data in the first storage area in response to a transmission request; and when the information in the group of data is changed and the bit content is changed, the second step is performed. A third step of copying storage data of the first storage area to the second storage area and rewriting bits of the second storage area corresponding to a changed portion; A fourth step of transmitting the storage data of the second storage area while sequentially reading the data, and copying the storage data of the second storage area to the first storage area; and storing the second storage area. And a fifth step of, when all the data has been read, sequentially transmitting the stored data in the first storage area after the copying while reading the data, wherein a program is recorded.