KR100439173B1 - Method for transmitting a packet data in a lonworks network - Google Patents

Abstract

Disclosed is a packet transmission method in a LonWorks network.

The present invention provides a packet transmission method in a LoneWorks network, comprising: checking an index number of a packet transmitted from an arbitrary node to a destination node, and sequentially counting the checked index number; Determining whether the equality value of the counted index number is changed; As a result of the determination, if the difference value is changed, requesting retransmission of all packets after the packet corresponding to the index where the difference value is started is requested from the destination node to any node.

Accordingly, the present invention creates an index in a packet transmitted through the Lontalk protocol on the LoneWorks network using the Lonetalk protocol, indexes the forwarding packet, and retransmits the lost data, thereby providing an un-acknowledge communication method. There is an effect that can satisfy both the high data transfer rate and the acknowledgment transmission data reliability.

Description

How to send packets on a LoneWorks network {METHOD FOR TRANSMITTING A PACKET DATA IN A LONWORKS NETWORK}

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to packet transmission technology in a Lonworks network commonly used in field bus systems, which are used for data transmission technologies such as building automation, factory automation, and industrial systems, including home automation systems. The present invention relates to a packet transmission method in a LonWorks network suitable for hybrid packet transmission combining a combination of a method and an un-acknowledge method.

In general industrial systems, serial communication methods such as RS232 or 485 communication are mainly used. These serial communication methods are not very suitable for application to buildings or factories where many serious noise sources are scattered due to very low noise characteristics. Due to the short data transmission length, various problems may occur in the wiring and router configuration, and the error rate is very high in the long distance data transmission.

For this reason, industrial field bus systems have been adopted in recent industrial systems, which have strong characteristics in noise sources, which make up for the shortcomings of serial communication. Among them, Echelon's Rontalk The "Lonworks system" based on the protocol (Lontalk Protocol).

Esheron's Loneworks system is very robust to noise sources, allowing seamless data transfers of up to two kilometers without a router in the middle (only a few tens of meters in serial communication).

In addition, in the transmission medium, various sources such as twisted pair line (TP), power line, and radio frequency are provided, and thus the environment is easily set during installation, and is widely used in industrial fields.

This LoneWorks communication method supports two methods. One of them is Eck, which guarantees data transmission reliability such as TCP / IP level in terms of data transmission reliability, and the other does not guarantee such reliability. There is an un-ek method with very fast transmission speed.

Eck method guarantees high data transmission reliability, but it can be 4 ~ 5 times slower than Unek method in terms of transmission speed. On the contrary, Unek method has almost no loss of data in noisy environment. If the processing speed is 4 to 5 times faster than the Eck method, it can be used as a big advantage in the system mainly targeting the speed.

In the following description, a LoneWorks system employing such an Eck method and an Unek method will be described in more detail.

FIG. 1 is a diagram illustrating a process of transmitting a network data and a software communication layer in a neuron chip hardware that provides a ron communication protocol of a general RonWorks system.

As shown, the transmission side application layer 1 is a layer in which a programmer performs programming, and represents a layer in which data to be transmitted is generated by the original programmer. The data generated by the programmer is then assigned to network variables, the transmission medium of the Loneworks network.

The network layer 2 assigns address information to the network variable in response to the change of the network variable, and delivers the network variable to the MAC layer 3. The network variable at this time is transmitted to the receiving node through the communication channel via the hardware layer (4).

The network variable transmitted to the receiving node is provided to the receiving hardware layer 5 and the MAC layer 6, and the receiving MAC layer 6 checks whether this data is valid.

The receiving network layer 7 then checks whether this data is for the receiving node or not and the address information assigned in the network variable.

This creates new data in the application layer by the scheduler in the receiving application layer 8.

2 is a view for explaining an Eck message transmission in the Eck method.

When the transmitting node transmits data by using the Ek service method, all receiving nodes should send an acknowledgment message for receiving the data to the transmitting node. It is the responsibility of the receiving network layer 8 of FIG. At this time, the data transmitted to the transmitting node is a message that does not contain any content.

3 is a view for explaining an eck check scheme in a network layer.

As described above, when using the Ech service method at the application layer, there is no need to play any role, so that the programmer does not need to execute any program regarding network reliability in the application program for this function.

The above method of guaranteeing the reliability of data transmission up to the level of TCP / IP on the Internet in terms of reliability of data transmission, the data transmission reliability is assured that the data transmission is guaranteed without any special program for the programmer. As a result, there is a disadvantage in that the transmission speed is 4 to 5 times slower than the uneque method. On the contrary, the uneak method is 4 to 5 times faster than the uneque method. Since there is no check on the received data at the network layer, there is a disadvantage that if the network data is lost in the transmission stage, it cannot compensate like UDP packets.

Therefore, the packet loss that can occur during transmission while satisfying the high transmission speed by using the uneak service method to utilize the advantages of both methods for intercommunication between intelligent devices on the LonWorks network using the Lontalk protocol A packet transmission technique that can compensate for this is desired.

The present invention has been made in accordance with the above-described requirements, and assigns an index within a packet transmitted through the Rontalk protocol and checks the order of these indexes during packet transmission. It is an object of the present invention to provide a packet transmission method in a LonWorks network that maintains high packet transmission reliability while maintaining a transmission speed in an unacknowledged manner.

In order to achieve the above object, the present invention provides a packet transmission method in a LoneWorks network, comprising: checking an index number of a packet transmitted from an arbitrary node to a destination node, and sequentially counting the checked index number; Determining whether the equality value of the counted index number is changed; As a result of the determination, if the difference value is changed, the method for transmitting a packet in a LoneWorks network includes requesting retransmission of all packets after the packet corresponding to the index where the difference value is started is transmitted from a destination node to an arbitrary node. to provide.

1 is a diagram illustrating a Neuron Chip communication layer and data transmission in a typical LonWorks network;

FIG. 2 is a diagram illustrating a neuron chip communication layer and an acknowledgment message transmission in an acknowledgment scheme in a conventional LonWorks network; FIG.

FIG. 3 is a view for explaining an Eck check process in a conventional LoneWorks network layer; FIG.

4 is a diagram illustrating a structure of a transport packet with an index field according to the present invention;

FIG. 5 is a view for explaining a process in which the packet structure of FIG. 4 is transmitted between nodes; FIG.

6 is a flowchart illustrating a packet transmission process using an indexing technique in a LoneWorks network according to a preferred embodiment of the present invention.

<Description of the code | symbol about the principal part of drawing>

13: node ID area

14: index number area

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the present invention.

4 is a structure diagram of a transport packet to which an index field is assigned according to the present invention.

As shown in FIG. 4, the packet structure according to the present invention may be divided into a node ID 13 area representing a target node, a data area, and an index number area in which a certain number is assigned to each packet generated.

FIG. 5 is a diagram illustrating a process in which the packet structure of FIG. 4 is transmitted between nodes, and FIG. 6 is a flowchart of a packet transmission process using an indexing technique in a LoneWorks network according to an exemplary embodiment of the present invention.

First, as shown in FIG. 4, the process of FIG. 6 assumes that an index number is assigned to each transport packet during data transmission.

In step S600 of FIG. 6, for example, if 10 packets are transmitted from node 2 to node 1, that is, packets as shown in FIG. 5, where N = 10, are nodes at node 2. If it is transmitted as 1, the process proceeds to step S602 and step S604 to determine whether it is a packet transmission process in the case of requesting index data or a packet transmission process of checking only a general node ID.

If the index data is requested (S602), the process proceeds to step S608, but if only the node ID is checked (S604), the process proceeds to step S606 to perform a corresponding data transmission process.

In step S608, the corresponding index is checked and sequentially counted. That is, when a packet is generated and transmitted from node 2 to node 1, the node counts and receives an index using a count variable in which all 10 packets are declared globally.

In step S610, it is determined whether an error (differential value variation) occurs in the index sequence. That is, it is determined whether the index order counted during packet transmission is sequential or non-sequential.

If 10 packets are received through a sequential index counting process, since all data are received without loss on the network, the process proceeds to step S606 to transmit the corresponding data.

However, if the determination result of step S610 indicates that the index order is out of order (if a change in the differential value has occurred), the process proceeds to step S612, in which the node 1 moves on to the node 2 after the packet corresponding to the index where the change in the differential value is started. Request retransmission of all packets.

For example, if node 1 receives a packet with index number 5 and suddenly a packet with index number 7 is transmitted, node 1 requests node 2 to retransmit all packets after the packet with index 6.

In this way, the requested node 2 retransmits all packets after index number 6, and if nodes 3 and 4 are requested in the same manner, all the packets after the requested index packet may be retransmitted.

As described above, the present invention implements indexing the forwarding packet by creating an index in the packet, thereby finding a loss for the transport packet that may occur during packet transmission, and retransmitting the lost data.

As mentioned above, although this invention was concretely demonstrated based on the Example, this invention is not limited to this Example, Of course, various changes are possible within the range which does not deviate from the summary.

As described above, according to the present invention, by creating an index in a packet transmitted through the Lontalk protocol on the LonWorks network using the Lontalk protocol, indexing the forwarding packet, and retransmitting the lost data, the fast speed of the uneque communication method is achieved. There is an effect that can satisfy both the transmission rate and the reliability of the transmission data of the Eck method.

Claims (3)

In the packet transmission method in the LoneWorks network, Checking an index number of a packet transmitted from an arbitrary node to a destination node, and sequentially counting the checked index number; Determining whether the equality value of the counted index number is changed; And, if the difference value fluctuates, requesting retransmission of all packets after the packet corresponding to the index in which the difference value fluctuates, from the destination node to the arbitrary node. Packet transmission method. The method of claim 1, The process of determining whether there is a change in the difference value, And a process of determining whether the order of the index number counted during the packet transmission is sequential or non-sequential. The method of claim 1, The packet is, A packet transmission method in a LoneWorks network, characterized by a structure divided into a node ID area, a data area, and an index number area.