JPS61173553A - Packet communication system - Google Patents

Abstract

PURPOSE:To process data with high time realness preferentially in a packet exchange network without any delay and without reference to whether a request to send is made early or late, the length of the data, etc., by providing priority information in a frame. CONSTITUTION:When packets of frame constitution are transmitted from low- priority circuits 1a and 1b to constituent equipment, detection parts DETa and DETb detect those packets, judge priority information PR in the frames, and open priority triggers from signal lines 4a and 4b when the priority level is high, thereby, registering the received packets from signal lines 2a and 2b in a high queue HQ as packets for the high queue through a signal line 5. A trans mission control part SND scans whether packets registered according to priority are registered in the high queue HQ or not through a control line 7 regardless of the order of registration in the queue and a packet H1 registered in the high queue HQ is transmitted to a high-priority line through a signal line 9 and a high-priority circuit 13 with a transmission trigger from a signal line 12. Further, the high queue HQ is scanned to transmit a high-queue registered packet H2 to the high-priority line.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a packet communication system.

[Conventional technology]

Conventionally, this kind of NoJ? In the packet communication system.

Data information was processed within the packet switching network in the order of transmission requests.

[Problem that the invention seeks to solve]

Therefore, even if the data requires real-time performance, the more data that is handled within the Nokket exchange network, the longer it will be held, and the disadvantage is that real-time performance will be impaired. .

[Means and effects for solving the problem] The packet communication system according to the present invention is characterized in that, in a packet exchange network that communicates information/e-tickets in frames containing at least destination information, priority information is provided in the frames. Preferably, information having a higher priority based on the priority information is processed preferentially within the packet switching network.

〔Example〕

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

FIG. 2 is a block diagram showing an embodiment of a packet switching network to which the packet communication system according to the present invention is applied. In FIG. 2, the telephone IL, which has a high priority as a terminal, is placed horizontally, and the data terminal DT, which has a low priority,
DT, Toga, Yacket exchange network component GWPa,
Connected via GWP, , PMX, , PMX, and ps. Also, TAt〜TAIl, TBI
~TB.

are the lines between the phone and GwPa and GwP, respectively.

DAI~DAa+DBt-DBb are the terminal and GWP, respectively.

〜PA PBl 〜PB are PMXa, respectively
The line between PMX and PSA+b is shown.

Next, the operation of the /4'4' butt system according to the present invention will be explained with reference to FIG.

When data terminals DT and L are transmitting to the packet switching network through line DAa, and a telephone equipment makes a transmission request to the packet switching network through line TA to the telephone equipment, cwpa determines the priority order in the frame. information(
(Details will be described later), and if there is no other high priority data, then the line GAa is sent to the upper PMXa.
The data of the telephone device is transmitted through.

Similarly, the data of this telephone device is PMX.

→PAIL4 P S −+ PB, −+ PMXb
−+ GBj −+ GWPb4 Sent to the telephone device through TBb.

FIG. 1 is a diagram showing an example of a frame (packet) format used in the packet communication system according to the present invention. The frame is surrounded by a synchronization flag F, and the use of the information field I other than the address field A, control field C, and frame check sequence FC3 is a feature of the present invention. That is, priority information PR is provided in the information field in addition to the data DATA.

FIG. 3 is a diagram for explaining the processing operations performed by the packet switching network components.

The lower line 1a, lb and other constituent equipment are shown in FIG. When a framed packet is sent.

The detection unit DET detects the packet and determines the priority information PR within the frame.

If the priority is high, the priority tree from signal lines 4a and 4b opens -, and the received packet on signal lines 2a and 2b is sent to Haikyu HQ via signal line 5 as a packet for Haikyu.
Register. On the other hand, if the priority is low, the signal line 3a,
The bird from 3b opens -.

The received packets on the signal lines 2a and 2b are registered in the low queue LQ via the signal line 6 as low key packets.

In this way, I? registered for each priority? Regardless of the order in which they are registered in the queue, the packet and transmission control unit SND first scans the control line 7 to determine whether or not they are registered in the Haikyuu HQ. The data is transmitted to the higher level via the signal line 9 and the higher level line 13 in response to a transmission trigger from . Furthermore.

Similarly, scan Haikyu HQ, register Haikyu/
4' Send H2 to the upper level. Continued to.

The high queue HQ is scanned, and if there are too many registered packets, the control line 8 is used to scan whether or not the registered packets are registered in the low queue LQ, and the low key - registration bucket) Ll is sent to the signal line 10 by a transmission trigger from the signal line 11. and transmits it to the upper layer via the upper line 13.

[Effects of the Invention] As explained above, according to the present invention, by providing priority information in the frame, regardless of whether the transmission request is early or late, the length of the data, etc. This has the advantage that highly real-time data can be processed preferentially within the motherboard exchange network without delay.

[Brief Description of the Drawings] Fig. 1 is a diagram showing an example of a frame (noquette) format used in the noquette communication method according to the present invention, and Fig. 2 is a diagram showing a packet switching network to which the packet communication method according to the present invention is applied. FIG. 3 is a diagram showing one embodiment of the present invention, and is a diagram for explaining the processing operations performed within the equipment that constitutes the packet switching network. F...Synchronization flag, A...Address field, C
...Control field, Fe2...Frame check sequence, ■...Information field, PR...Priority information Fig. 1 Fig. 3

Claims (1)

[Claims] 1. In a packet switching network that communicates information in packets of frames that include at least destination information, by providing priority information in the frame, priority is given to information with a higher priority according to the priority information in the packet switching network. A packet communication method that is characterized in that it is processed according to the method.