JPS63189032A - Packet transfer control system - Google Patents

Abstract

PURPOSE:To relax a congested state in a junction line and to attach a bypass function at the time of generating a fault, by varying a junction path for a data for which no sequence control is required in high speed packet communication. CONSTITUTION:In a communication network in which the junction path is selected by a hardware switch 101 and the communication of a blocked packet data is performed, an identification information attaching means 102 and a transfer control means 103 are provided. The identification information attaching means 102 attaches a bit of identification information representing that no necessity to preserve the sequentiality of each block mutually exists in the communication network on the packet for which the above fact is applied. The transfer control means 103 performs the selective connection of the junction path selected corresponding to the state of the network and a fixed junction path by controlling the hardware switch 101 corresponding to the presence/ absence of the bit of identification information. In such a way, it is possible to vary the junction path for the data for which no sequence control is required, and to relax the congested state of the junction line based on transient traffic concentration, etc., due to the fixing of the path.

Description

[Detailed Description of the Invention] [Summary] In a communication network that communicates blocked packet data, if the communication does not require guaranteeing the order of data blocks in the communication network, a flag is set in the packet header. packets whose relay connection flag is not set are controlled to use a fixed route, and packets whose flag is set are controlled to be connected to a route selected according to the network status at that time. This will alleviate trunk line congestion caused by traffic concentration, and
It is designed to have a detour function in the event of a failure in the relay system.

[Industrial application field]

The present invention relates to a packet transfer control method in a high-speed packet communication network, and is particularly applicable to data that does not require order control in a high-speed packet communication network in which packet order control during relay connections is abolished and relay connections are made based on fixed routes. The present invention relates to a packet transfer control system that makes the route variable to alleviate congestion in trunk lines caused by fixed routes, and provides a detour function in the event of a failure in the relay system.

A high-speed packet communication network accommodates communication of various media such as voice, images, and data, and performs high-speed exchange processing using hardware switches. In this case, since audio and image communication requires continuity and order preservation, and the amount of communication data is constant, communication with a fixed relay route is suitable. On the other hand, in general data communication, data is generated in bursts, and if the device that performs data communication has a built-in sequential function, the relay route is not fixed and the network condition changes at the time. It is desired to be able to perform communication by selecting a relay route according to the situation.

[Conventional technology]

In conventional packet communications, exchange processing for low-speed data is performed under software control using a microprocessor or the like, and all data including sequence control is exchanged in a unified manner.

On the other hand, in high-speed packet communication, which has been researched recently, in order to accommodate voice and image communication and perform high-speed processing, the exchange process is performed by hardware switches, and in order to eliminate the need for packet order control, all communication However, the relay route is fixed.

[Problem that the invention seeks to solve]

High-speed packet communication accommodates communication of various media such as voice, images, and data, and performs high-speed exchange processing using hardware switches, but in this case, voice and image communications require continuity and order preservation. , and the amount of communication data is constant, so a communication method with a fixed relay route is suitable.

On the other hand, in general data communication, data is generated in bursts, and many communication devices (terminals) may generate data at the same time, which causes a temporary state of congestion in trunk lines. However, there is a problem in that the conventional packet transfer control method in which the relay route is fixed cannot cope with this problem.

[Means for solving problems]

In order to solve the problems of the prior art, in the packet transfer control method of the present invention, relay routes are selected and blocked by a hardware switch 101, as shown in the basic configuration of FIG. In a communication network that communicates packet data, identification information adding means 102
and a transfer control means 103.

Identification information adding means 102 adds identification information indicating this to a packet for communication in which there is no need to preserve the order of each block data in the communication network.

The transfer control means 103 controls the hardware switch 101 depending on the presence or absence of this identification information, and selectively connects the relay route selected according to the network state and the fixed relay route.

[For production]

For communications in which packet data is divided into blocks and there is no need to preserve the order of each data block on the communication network, additional information indicating this is added to the packet, and the data is processed according to the presence or absence of this identification information. By controlling the hardware switch to selectively connect the selected relay route and the fixed relay route depending on the network status, the relay route can be made variable for data that does not require order control. Therefore, it is possible to alleviate the congestion of the trunk line due to temporary traffic concentration due to fixed routes, and to provide the relay system with a detour function in the event of a failure.

〔Example〕

FIG. 2 shows an embodiment of the present invention, and shows an example of the configuration of nodes in a high-speed packet communication network according to the method of the present invention, in which 1 is a high-speed packet communication node, 2 is a communication device such as a terminal, 3 is a trunk line for other high-speed packet communication nodes. Further, in the high-speed packet communication node 1, 11 is a line set for accommodating a communication device 2 such as a terminal for the high-speed packet communication node 1, 12 is a hardware switch, and 13 is a transfer control for controlling packet transfer in the hardware switch 12. The control section 14 is a trunk line interface section for accommodating the trunk line 3 to the high-speed packet communication node 1.

In FIG. 2, Tsushin W2 notifies (or sets) the line set 11 whether the communication requires a fixed relay connection. When the communication is a variable relay connection that does not require a fixed relay connection, the line set 11 sets a flag in the header of the packet and passes this packet to the transfer control unit 13 as mm. The transfer control unit 13 determines the trunk line interface unit 14 to which the packet should be transferred from the header of the incoming packet, and controls the hardware switch 12 to transfer the packet to the specified trunk line interface unit 14. This causes the packet to be transmitted to the bar.

At this time, the transfer control unit 13 performs control to immediately select a predetermined trunk line interface unit 14 when a fixed relay connection is specified, but when a variable relay connection is specified, the transfer control unit 13 performs control to immediately select a predetermined trunk line interface unit 14 depending on the network status. to select the trunk line interface section 14. In other words, the intermediate line interface unit 14 indicates the network status such as the failure status of the trunk line 3 connected to it, and the transfer control unit 13 indicates the trunk line interface in the case of a variable relay connection. Transfer control for the hardware switch 12 is performed by changing the information held by the unit 14 or by changing the way the information is processed depending on the state of the unit 14. Therefore, in the case of a variable relay connection, it is possible to alleviate the congestion when the trunk line is congested, and to take a detour of the medium line when there is a failure in the relay system.

The above describes the case where a packet is transferred from the communication device 2 to the trunk line 3 via the high-speed packet communication node 1, but when the packet is transferred from the trunk line 3 to the communication device 2 via the high-speed packet communication node 1 Similarly, packets are transferred as indicated by → marks in FIG.

FIG. 3 shows a packet format according to an embodiment of the present invention, in which 20 is a packet header, 21 is an LCN (logical channel number), and 22 is a flag according to the present invention. The flag 22 can also be made to have that function as part of the LCN 21 by expanding the LCN 21.

FIG. 4 shows the configuration of a transfer control section according to an embodiment of the present invention, in which 12 is a hardware switch, 13 is a hardware switch;
is the transfer control unit. In addition, in the transfer control unit 13, 1
31 is a header check unit for analyzing the header of a packet; 132 is a fixed connection table that specifies the outgoing trunk line based on the logical channel number LCN of the header during fixed relay connection; and 133 is the logical channel number LCN of the header during variable connection. A variable connection table 134 designates a transmission trunk line based on a selector.

In FIG. 4, a header check unit 131 refers to a fixed connection table 132 when a fixed relay connection is specified, and when a variable relay connection is specified, according to the logical channel number LCN in the header of an incoming packet. Refer to the variable connection table 133. At the same time, the selector 134 selects the output information of one of the specified tables according to the flag information in the header of the packet, and provides it to the transfer control unit 131 as transfer destination information.

As a result, the transfer control unit 131 controls the hardware switch 12 to transfer the packet to the designated trunk line interface unit 14.

Therefore, by changing the information in the variable connection table 133 depending on the state of the trunk line interface section 14, or by changing the way the table information is processed, transfer control can be performed according to the state of the trunk line interface section. , it becomes possible to alleviate congestion in trunk lines and to take a detour in the event of a failure in the trunk system.

〔Effect of the invention〕

As explained above, according to the present invention, in high-speed packet communication based on relay connections with fixed routes using hardware switches, by making the relay route variable for data that does not require order control, Based on the temporary concentration of traffic due to fixed traffic, etc., it becomes possible to alleviate the congestion state in IawA and provide a detour function in the event of a failure in the relay system.

[Brief explanation of the drawing]

Fig. 1 is a diagram showing the basic configuration of the present invention, Fig. 2 is a diagram showing the configuration of a node of a high-speed/('kerato communication network) according to an embodiment of the present invention, and Fig. 3 is a diagram showing an embodiment of the present invention. FIG. 4 is a diagram showing the configuration of a transfer control unit according to an embodiment. 1... High-speed packet communication node 2... Communication device (terminal, etc.) 3... Trunk line 11... Line set 12... Hardware switch 13... Transfer control unit 14... Trunk line interface unit 131... Header check unit 132... Fixed connection table 133... Variable connection table 134 ...Selector Patent Applicant Fujitsu Co., Ltd. Agent Patent Attorney Tamamushi Kugobe (1 other person) Diagram showing the principle structure of the present invention Figure 1 Figure 2 @Packet to Nanda 3 @ Relay line Interface Recirculation 4 showing the configuration of the transfer control unit of an embodiment of the present invention
@

Claims (1)

[Claims] In a communication network that communicates blocked packet data by selecting a relay route using a hardware switch (101), it is necessary to preserve the mutual order of each block data in the communication network. an identification information adding means (102) for adding identification information indicating this to the packet for communication without the identification information, and the hardware switch (102) depending on the presence or absence of the identification information
101) to selectively connect a selected relay route and a fixed relay route according to network conditions. control method.