JPH0595375A - Packet data communication method - Google Patents

Abstract

PURPOSE:To prevent the degradation of transmission efficiency occurred by performing unnecessary ACK return and a checksum calculation in a communication path with a high eliability. CONSTITUTION:This method is characterized by deciding the reliability of the transmission line to an opposite station by referring to a communication path reliability table 2 in a transmission station, by transmitting 5 the information showing the presence or absence of the necessity of a check-sum calculation for the header part of a packet 3 and the necessity of the presence or absence of the necessity of an ACK return 4 by storing the informationn in the header part, and by omitting the checksum calculation and the ACK return when they are not necessary based on the information on the presence or absence of the necessity of the checksum calculation and the ACK return stored in this header part in a reception station.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a packet data communication method.

[0002]

2. Description of the Related Art In conventional packet data communication, communication protocol procedures such as ACK return and omission of checksum calculation cannot be omitted depending on the reliability of the transmission path.

[0003]

[Problems to be Solved by the Invention] Conventional ACK return,
Alternatively, even if the communication method that always calculates the checksum has high reliability of the communication path and packet loss or loss is so small that practically no problem, ACK
Is being sent back and the checksum of the packet is being calculated.

[0004] A for the purpose of guaranteeing the reliability of communication in packet communication using a communication path with low reliability
Returning CK and calculating checksum are often unnecessary for practical use when using a highly reliable communication path.
Simply the amount of communication traffic and ACK at the receiving station side,
This causes an increase in the overhead associated with the checksum and causes a decrease in transmission efficiency. Such a problem is caused by the fact that information regarding the reliability of the communication path is not sufficiently added to the communication method, and is one of the problems to be solved by the conventional communication method.

[0005]

According to the packet data communication method of the present invention, the transmitting station determines the reliability of the transmission path to the partner station based on the communication path with the partner station, and determines the header portion of the packet. Checksum calculation required,
A route reliability table, which is information indicating whether or not ACK needs to be returned, is prepared, stored in the header portion of the packet, and transmitted. On the other hand, at the receiving station, checksum calculation showing the reliability of the transmission path stored in this header part of the received information and checksum calculation if not necessary based on the information on the necessity of ACK return It is characterized in that ACK return is omitted.

[0006]

As described above, by adding the omission permission information for the checksum calculation and the ACK return processing in the header when transmitting the packet, the receiving station can omit the unnecessary processing.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the flow of processing at a packet transmission station. After determining the communication path to the partner station, the transmitting station refers to the communication path reliability table and determines whether checksum calculation and ACK transmission for the transmission packet are necessary or not, and the result is stored in the header part of the packet. Store. The packet structure is shown in FIG. Information about whether or not the ACK is returned and the checksum is calculated is stored as a flag.

FIG. 3 shows the flow of processing at the receiving station. When the receiving station receives the packet, the AF and CF flags are checked, and if the flag is set to 1, each processing is executed. If the flag is 0, the process is omitted.

[0009]

As described above, according to the present invention,
Based on the reliability of the communication route used by the packet transmission station, the necessity of returning an ACK and calculating the checksum is determined, that information is added to the transmission packet, and it is transmitted to the partner station. By referring to the information, it is possible to omit the processing for the processing unnecessary, and as a result, it is possible to reduce the traffic on the communication path and the overhead at the receiving station.

[Brief description of drawings]

FIG. 1 is a flowchart of processing of a communication station according to an embodiment of the present invention.

FIG. 2 is a packet structure diagram according to the embodiment.

FIG. 3 is a processing flowchart of the receiving station according to the embodiment.

Claims (1)

[Claims] 1. The transmitting station judges the reliability of the transmission path to the partner station, and in the header section of the packet, the header section of the packet is provided with information indicating whether or not checksum calculation is necessary and whether or not ACK return is necessary. Stored and transmitted, and at the receiving station, checksum calculation indicating the reliability of the transmission path stored in this header part, and checksum calculation and ACK if not necessary based on the information on the necessity of ACK return A packet data communication method characterized by omitting returning.