KR100442261B1 - Variable method for waiting time - Google Patents

Abstract

The present invention relates to a home networking system, and more particularly, to a weighting type variable method of varying a communication delay time between home appliances in the home using the Internet. As described above, in the method for varying a weighting time according to the present invention, in the method of varying a weighting time at an application layer of a main device, determining a weighting time according to a command to be transmitted by the application layer of the main device, wherein the weighting time is determined And transmitting a transmission command packet to a peripheral device, and confirming a communication completion state between the main device and the peripheral device according to whether the transmitted transmission command packet is received from the peripheral device. .

Description

Variable method for waiting time}

The present invention relates to a home networking system, and more particularly, to a weighting type variable method of varying a communication delay time between home appliances in the home using the Internet.

A home networking system is a system that literally connects various devices in the home, that is, a plurality of peripheral devices such as a telephone, a TV, a telephone, an air conditioner, and the like by communicating with one network.

In general, communication is divided into layers, each of which operates independently, and each layer divides data through communication with each other.

Briefly, the OSI communication layer used as the basis of the communication protocol will be described with reference to FIG. 1.

First, in the case of a slave, the application layer consists of application software, message configuration, message execution, message combination, and message duplication check area, and data including packet configuration, packet transmission, CSMA / CD, packet check, address check, and packet data reception area. It consists of a link layer and a physical layer consisting of a UART, wherein the physical layer may include an adapter selected when using power line communication.

In case of the master, the application layer consists of application software, message composition, message partitioning, and message combination areas, and data consisting of packet configuration, packet transmission, packet transmission confirmation, CSMA / CD, packet check, address check, and packet data reception area. It consists of a link layer and a physical layer consisting of a UART. The physical layer of the master may include an adapter that is selected when using power line communication like the slave.

At this time, the physical layer plays a role of receiving the bit signals from the communication line to form a packet or carrying a packet transferred from the data link layer as a bit signal to the communication line.

The data link link layer configures a packet using data received from the application layer and transmits the packet to the physical layer, or processes the packet received from the physical layer and hands it over to the application layer. The data link layer has a slightly different role between the master and the slave. The master includes a process for ensuring packet transmission to the physical layer. The physical layer and the data connection layer have the same structure as the product acting as a slave.

The application layer consists of a message set and is responsible for interpreting and processing messages. In the product acting as a slave, the message includes methods such as load control and memory control, and in the master, the slave manages the slave or controls the entire network by using the result of processing the message.

The application layer therefore contains different content for different products. The application layer of the master also includes a role of a transport layer that divides and transmits a packet when there is more data to transmit than one packet range, or combines and processes a packet when the divided packet is received. The distinction between transport layers is included in the application layer because packet segmentation and combination is a task performed only for a specific message and not all messages.

The packet communication structure between the communication layers is interfaced by a message unit between the application layer and the data connection layer, and by a full packet unit between the data connection layer and the physical layer.

As described in detail above, the master application layer sends commands to other devices (slaves) and waits for a response. In this case, a waiting time is required because the master cannot wait for a response.

However, the weighting time is determined by the application layer. The application layer does not know whether the data came or not before uploading the data from the data link layer. If the weighting type is too long, the network speed becomes slow, and if the weighting time is too short, communication is lost. There are many cases of failure, and in case of communication failure, there is a problem that traffic occurs during retransmission.

Accordingly, an object of the present invention is to provide a weighting time variable method that can vary the weighting time according to the type of transmission command in the application layer of the master in consideration of the above-mentioned problems of the prior art.

According to an aspect of the present invention, a method for varying a weighting time in an application layer of a main device includes determining a weighting time according to a command to be transmitted by an application layer of the main device. And when the weighting time is determined, transmitting a transmission command packet to a peripheral device, and confirming a communication completion state between the main device and the peripheral device according to whether the transmitted transmission command packet is received at the peripheral device. It is characterized by.

1 shows a general communication layer

2 is a flowchart illustrating a variable weighting method according to the present invention.

Hereinafter, the weighting time variable method according to the present invention will be described in detail with reference to the accompanying drawings.

2 is a flowchart illustrating a method for varying a weighting time according to the present invention.

The variable weighting method according to the present invention will be described with reference to FIG. 2. First, all peripheral devices in a home are connected to a network, and a main device for managing the same is installed, where the main device is a PC that we generally use. , Peripherals are home appliances used in our homes, such as refrigerators, washing machines, TVs, rice cookers, air conditioners, boilers and audio. The peripheral devices transmit a transmission command from the main device to the peripheral devices on the premise that they can be deleted from the network connected to the main device in each home, and the type of the transmission command is determined by the application layer of the main device (S1). ).

According to the determination result S1, a weighting time is determined (S2).

Here, the weighting time determination is for varying the weighting time according to the type of the transmission command. The weighting time is determined in consideration of the length of the received packet since the application layer of the main device knows the packet length of the command to be transmitted.

If the command to be transmitted is a group command, the transmission data is small, but the packets to be returned come from several peripheral devices, so the reception must be several.

For example, if 10 products would respond, the wait time would be longer because you would have to wait for the 10 products to respond.

On the contrary, in the case of a download command, the weight is transmitted but the size of the received packet is small.

Here, the determination of the weighting time may be determined through an equation, which is as follows.

[Equation 1]

Tw = (Tt + alpha) * Nt + (Tt + alpha) * Nr * Ndevice + beta

As a reference,

Tw: weighting time

Tt: Time taken to send / receive 1 byte

alpha: time margin of byte sending and receiving

Nt: Send packet size

Nr: Receive Packet Size

Ndevice: Number of devices to send incoming packet

beta: Margin value considering network environment

Subsequently, when the weighting time is determined (S2), the application layer of the main device transmits a packet of a command to be transmitted to the peripheral device (S3).

The packet transmission result (S3), the peripheral device determines whether the received packet (S4).

As a result of the determination (S4), if a packet is received, the peripheral device transmits a reception completion message to the main device.

On the other hand, if the determination result (S4), the packet is not received, it is determined whether the weighting time has elapsed (S5).

As a result of the determination (S5), if the weighting time has not elapsed, it waits until the packet transmitted according to the determined weighting time (S2) is received.

On the other hand, if the weighting time has passed (S5), the communication failure processing message is transmitted to the main device (S6).

As described above, the variable weighting method according to the present invention has the following effects.

First, by varying the weighting type, the application software can be operated to fit the size of the network.

Second, since the weighting time is variable according to the type of packet, not only the network speed but also the probability of communication failure is reduced and traffic is not wasted.

Those skilled in the art will appreciate that various changes and modifications can be made without departing from the spirit of the present invention.

Therefore, the technical scope of the present invention should not be limited to the contents described in the examples, but should be defined by the claims.

Claims (3)

In the method of varying the weighting time in the application layer of the main device, Determining a weighting time according to a command to be transmitted by an application layer of the main device; If the weighting time is determined, transmitting a transmission command packet to a peripheral device; and And checking a communication completion state between the main device and the peripheral device according to whether the transmitted transmission command packet has been received by the corresponding peripheral device. The method of claim 1, The weighting time determination is multiplied by the transmission packet size by adding the time taken to transmit and receive a byte and the time margin of byte transmit and receive. A weighting type variable method, characterized in that the weighting time is determined by sequentially multiplying the number of devices to be sent, and then adding a margin value considering the network environment. The method of claim 1, The checking of the communication completion state according to whether the transmitted transmission command packet is received from the corresponding peripheral device may include: If the peripheral device receives the packet, transmits a reception completion message to the main device, and if the peripheral device does not receive the packet, determining whether the determined weighting time has elapsed; According to the determination result, the weighting time is not elapsed, waiting until the transmission command packet is received, the weighting time has elapsed, and comprising the step of transmitting a communication failure processing message to the main device Type variable method.