JPS63250245A - Communication control system - Google Patents

Abstract

PURPOSE:To attain an effective process by putting the length of following transmitted data information on current transmitted data information from a transmission side to a reception side as additional information. CONSTITUTION:In the case of transmitting packet data 5a, a packet exchange 4 sets the data length of next transmitted packet data 5b in a next data length area 6a in the packet data 5a so as to transmit on a physical line 3. A terminal 1 which receives the packet data 5a like this decides that the next transmitted packet data 5b is short packet data by a next data length identification part 7. Thus, a short packet receiving buffer 2b which is optmum for the short packet data can be prepared, so that the effective process can be executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention is particularly applicable to communication between a packet switch that handles packet data based on the CCITT (International Telegraph and Telephone Consultative Committee) X, 25 Recommendation and a communication terminal. This concerns the control method.

[Conventional technology]

FIG. 3 is a schematic diagram showing a conventional communication control method using packet data. In the figure, 1 is a terminal that handles packet data, 2 is a buffer for packet reception, 3 is a physical line for transmitting and receiving packet data, 4 is a packet switch, and 5a.

5b and 5c are packet data, of which A and B
indicates a logical channel identifier.

In the communication control method using packet-data as shown in FIG. 3 above, for convenience of explanation, the packet switch 4
Therefore, only the transfer of packet data to terminal 1 will be considered. In general, the packet switch 4 can establish a plurality of logical channels with the terminals 1 it accommodates, and can specify a packet size for each logical channel. As shown in FIG. 3, A and B in each packet data 5a to 5c are logical channel identifiers, and in this case, the logical channel identifier A has a packet size of a long packet (for example, 4
The packet size of logical channel identifier B is set to 5hort (short) packet (for example, 128 bytes). The terminal 1 that receives each of the packet data 5a to 5C monitors the physical line 3 connected to the packet switch 4, and stores the packet data in the nomicerato reception buffer 2 every time the packet data 5a to 5C is received. I will continue to receive it. However, since it is unknown whether a long packet or a 5-hort packet is being received at this time, a packet reception buffer 2 having a size that can receive long packets is normally provided, and the packet is not constantly in use. I am trying to prepare for the reception of packets.

[Problem that the invention seeks to solve]

In the conventional communication control method as described above, each packet data 5a to 5C is not processed until it is received and viewed as explained above.
Even when receiving a 5-hort packet (128 bytes), the packet reception buffer 2 must be prepared assuming a long packet (4096 bytes), and such lo
If 5hort packets (128 bytes) were received using the packet reception buffer 2 (for example, 4096+α bytes) for receiving ng packets, it would be very uneconomical and wasteful in terms of buffer memory usage efficiency. There was a problem in that it meant that a different method was being adopted.

This invention was made in order to solve this problem.It allows the receiving side to know in advance the data length of the next packet (bucket) to be received, and efficiently uses a packet receiving buffer with an optimal packet size. The purpose is to obtain a communication control method that can realize processing.

[Means for solving problems]

The communication control method according to the present invention includes the length of the next transmission data information as additional information in the current transmission data information from the transmission side toward the reception side. Recognize the length of information in advance,
It is possible to prepare a data information receiving buffer that is optimal for the length of this data information.

[Effect]

In the communication control system of the present invention, the current transmission data information sent from the transmitting side to the receiving side includes the length of the next transmission data information as additional information. By analyzing the information, it is possible to prepare an optimal data information reception buffer for the next transmission data information.

〔Example〕

FIG. 1 is a schematic diagram showing a communication control method using packet data according to an embodiment of the present invention.

In the figure, 1 is a terminal that handles packet data; 2 is a terminal that handles packet data;
a is long packet reception buffer, 2b is 5hor
t a buffer for packet reception; 3 a physical line for sending and receiving packet data; 4 a packet switch; 5a;
5b and 5c are packet data, here 5a is long packet data, 5bt5C is 5hort
It stores packet data. Also, each packet
A and B in data 5a to 5C indicate logical channel identifiers. 5a.

6b is the next data length area in each packet fist data 5a, 5b, 7 is the next data length identification unit that identifies the data length of the next data length area 6 and selects the optimal packet reception buffer, 8 is the packet Packet transmission 1 in exchange 4
This is a buffer for δ.

FIG. 2 is a diagram showing the format of packet data used in the communication control method shown in FIG.

Next, the operation of the communication control system, which is an embodiment of the present invention shown in FIG. 1 above, will be explained. As shown in FIG. 1, when transmitting packet data 5a, packet switch 4 sets the data length of packet data 5b to be transmitted next in next data length area 6a of packet Φ data 5a, and physically Send on line 3. The form (format) of the packet data 5a at this time is as shown in FIG. 2 (in the case of modulo 8). The terminal 1 that has received such packet data 5a determines that the next packet Φ data 5b to be transmitted is 5-hort packet data using the next data length identification unit 7, and thereby
5hort/' is optimal for short packet data:
It is possible to prepare a packet reception buffer 2b.

Note that the next data length area 6 in the packet data 5a
A can be set in any octet in the packet data 5a. However, an agreement must be reached between the packet switch 4 and the terminal 1.

〔Effect of the invention〕

As explained above, in a communication control system, this invention allows the length of the next transmission data information to be included as additional information in the current transmission data announcement from the transmitting side to the receiving side. Because it is possible to recognize the length of the data update in the next data information in advance and prepare the data information reception buffer that is optimal for the length of this data information, it is possible to prepare the data information reception buffer that is optimal for the length of the data information. This has the excellent effect of realizing even more efficient processing using the reception buffer.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram showing a communication 1 control method using communication packet data, which is an embodiment of the present invention, and FIG. 2 is a diagram showing the format of packet data used in the communication 1 control method shown in FIG. , FIG. 3 is a schematic diagram showing a conventional communication control method using bucket book data. In the figure, 1...terminal, 2...buffer for packet reception, 2a...buffer for long packet reception, 2b...buffer for 5hort packet reception, 3.
...Physical line, 4...Packet switch% 5a, 5b
, 5c...Packet data, 6a, (5b...Next data length area, 7...Next data length identification section, 8...
Packet transmission buffers, A, B...logical channel identifiers. In each figure, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a communication control system, when data information is transmitted from a transmitting side to a receiving side, a means is provided for transmitting the length of the next transmitted data information as additional information in the current transmitted data information to be transmitted. A communication control method characterized by: