JPH0239750A - Packet transmission control system - Google Patents

Abstract

PURPOSE:To improve the processing ability of a packet switchboard by first returning the packet to be preferentially transmitted like a call control packed. CONSTITUTION:A packet transmission control part 5 is equipped with a packet transmission classification deciding part 5B to add '1' as a code to be added to the deciding bit of transmission packets 2C...2N to be preferentially transmitted, and a deciding bit identifying part 5C to identify the transmission packets 2C...2N, whose deciding bit code is '1' out of the transmission packets 2A to 2N accumulated in a memory means 4, and a transmission control means 5A controls so that the transmission packets 2C...2N whose deciding bit code identified by the deciding bit identifying part is '1' may be preferentially transmitted to the other transmission packets 2A, 2B,....

Description

[Detailed description of the invention] [Industrial application field] The present invention is utilized in a packet switch.

The present invention relates to a packet transmission control method for a packet switch that transmits specific packets with priority over other types of packets.

〔overview〕

The present invention uses FIFO (first-in-random-out) memory as the transmission memory in a packet transmission control method for a packet switch equipped with a packet control unit that outputs transmission requests for transmission packets stored in a storage means to a line. The purpose of this is to improve the call processing ability of the packet switching device by outputting the packets to be transmitted with priority in the transmitter 7) according to the transmission request, regardless of the order of accumulation.

[Conventional technology]

Conventionally, this type of packet switching equipment stores transmission packets in a transmission packet buffer, which is a storage means, regardless of the type of packet, and transmits the packets in the order in which transmission requests are generated first. Therefore, the priority of transmission depending on the type of packet is not taken into consideration.

[Problem that the invention seeks to solve]

However, in the conventional packet switching equipment described above, if, for example, a call control packet is stored in the transmission packet buffer next to a data packet, the data packet must be transmitted before the call control packet is transmitted. The disadvantage is that the call processing capacity of the exchange is reduced.

An object of the present invention is to solve this drawback and provide a packet transmission control method that does not reduce the call processing capacity of a packet switch.

[Means for solving problems]

The present invention provides a packet switching device equipped with a means for storing a plurality of transmission packets, and a packet transmission control section for outputting M transmission packets stored in the storage means to a line in accordance with respective transmission requests. In the packet transmission control method, the storage means is of a first-in/random-out format that can be read in any order regardless of the order of written transmission packets, and the storage means is used for determination bits of transmission packets to be transmitted with priority. The packet transmission control unit includes a packet transmission type determination unit that adds a code when writing to the packet, and a determination bit identification unit that identifies the determination bit of the transmission packet stored in the storage means. The present invention is characterized in that it includes a control means for reading transmission packets to which corresponding codes are added from the storage means and transmitting them with priority regardless of the order in which they are stored.

[Effect]

The transmitted packets include data packets, call control packets, etc., which are stored in the storage means in the order in which they occur. Therefore, when the packets are stored, the packet transmission type determining section adds a code to the determination bits of high priority packets such as call control packets to distinguish them from low priority data packets and the like.

Since the storage means is of a first-in/random-out type, the judgment signals are transmitted in a separate section starting from the one with the highest priority, regardless of the order in which they are stored.

This improves call processing capacity.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a block diagram of an embodiment of the present invention.

In FIG. 1, various transmission buckets) 2A to 2N sent from each terminal 1 are sent via a packet multiplexing means 3,
It is configured to be stored in the storage means 4 and transmitted to the line 6 by the transmission control means 5A of the packet transmission control section 5.

Here, the feature of the present invention is that the storage means 4 is of a first-in/random-out format that can read out the stored transmission packets at random, and can read out the transmission packets in any order regardless of the order in which they are stored. It can be read by .

The packet transmission control unit 5 also includes a packet transmission type determination unit 5B that adds “1” as a code to the determination bit of the transmission packets 2C...2N that should be transmitted with priority.
A transmission bucket whose judgment bit has a code of "1" from among transmission buckets 2A to 2N stored in the storage means 4) 2C
. . . includes a determination bit identification unit 5C for identifying 2N,
The transmission control means 5A transmits 1 word 1 packet 2 in which the code of the judgment beat I identified by this judgment bit identification section is "1".
C...2N, other sending buckets) 2A, 2B-...
The objective is to control the transmission to one destination with higher priority.

That is, the packet determination focus is set to "1" for transmission packets determined by the transmission packet type determination unit 5B as packets to be transmitted with priority, and the packets are stored in the storage means 4 in a first-in/random-out format. Ru. The judgment bit identification unit 5C is a transmission bucket stored in the storage means 4)
Check the determination bits 2A to 2N, and if they are not "1", leave them as they are; if they are "1", instruct the transmission control means 5A to transmit them preferentially in the order in which they are stored in the storage means. . After the transmission control unit 5A completes the transmission process based on the currently executed transmission request, the transmission control unit 5A selects the determination bit identification unit 5.
A transmission request for the identified priority transmission packet of C is output to the line side, and this transmission packet is transmitted with priority.

FIG. 2 shows a control flowchart of this embodiment.

In the embodiment described above, the code indicating the priority added to the determination bit is "1", but in the present invention, this may be set to "0". Furthermore, by using a code with a plurality of digits, it is possible to further subdivide the priority ranks of transmission packets.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to increase the call processing capacity of the packet switch by transmitting packets that should be transmitted preferentially, such as call control packets, first.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention. FIG. 2 is a control flow chart of the above embodiment. 1...Terminal, 2A-2N...Sending packet, 3...
- Packet multiplexing means, 4... Storage means, 5... Packet transmission control section, 5A... Transmission control means, 5B...
- Packet transmission type determination section, 5C... Judgment bit identification section, 6... Line.

Claims (1)

[Claims] 1. A storage means (4) capable of storing a plurality of transmission packets; and a packet transmission control section (5) that outputs the transmission packets stored in the storage means to a line in accordance with each transmission request. In the packet transmission control system of a packet switch equipped with a packet transmission type determination section (5B) that adds a code to the determination bit of a packet when writing it into the storage means; and a determination bit identification section (5C) that identifies the determination bit of the transmission packet stored in the storage means. The packet transmission control section includes a control means (5A) for reading transmission packets to which the code has been added corresponding to the identification output of the determination bit identification section from the storage means and transmitting them with priority, regardless of the order in which they are stored. A packet transmission control method characterized by: