JPH0946396A - Method for adding time stamp to data packet - Google Patents

Abstract

PROBLEM TO BE SOLVED: To calculate the delay time between an application layer and an IP layer in transmission and reception by using the time stamp of a transmission side IP layer and the time stamp of a reception side IP layer in an application layer. SOLUTION: When the data packet transferred from a TPC layer 2 is transferred to a lower rank layer 4 in the IP layer 3 of a transmission side host device, the IP header to which a time stamp is imparted is added to a decomposed data packet when the data packet is delivered from the TPC layer 2 and the data packet is transferred to the lower rank layer 4. In the IP layer 6 of a reception side host device, the time stamp is added to the TOS field of an IP header for the packet transferred from a lower rank layer 5 just before the packet is transferred to a TCP layer 7 and the packet is transferred to the TCP layer 7. In the TCP layer 7, the data packet is reassembled and transferred to a higher rank layer 8. Thus, a point of time when the data packet passes the IP layer is defined as a starting point and the time required for the transfer of the data packet can be measured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a time stamp adding method for transferring a data packet in a communication network, and more particularly to a method for adding a time stamp in an IP layer.

[0002]

2. Description of the Related Art When transferring a data packet through a communication network, it is necessary to add a time stamp to either the arrival time or the delay time of the data packet in order to measure the arrival time or delay time. In such a case, conventionally, an application program for measurement is used and a method of inserting a time stamp in a data field is used.

[0003]

However, in the conventional method, it was not possible to perform the measurement starting from the time when the data packet passed through the IP layer. An object of the present invention is to make it possible to measure the time required for transferring a data packet and the like, starting from the time when the data packet passes through the IP layer.

[0004]

In order to solve the above-mentioned problems, the present invention adds a time stamp to the TOS field of the IP header at the transmission side when transferring a data packet from the IP layer to a lower layer, and receives the data packet. On the side, when the data packet is transferred from the IP layer to the upper layer, the time stamp is added to the TOS field of the IP header.

FIG. 1 is a diagram showing a route along which a data packet is transmitted from a transmitting side host device to a receiving side host device. The communication protocol comprises an application layer, a TCP layer, an IP layer and a lower layer from the upper side, and the lower layer is connected to a communication medium. IP with a communication network of such a configuration
By introducing a time stamp in the layer, it is possible to measure the time taken for the data packet to reach the application layer of the host device of the receiving side from the IP layer of the transmitting side and the receiving side.

[0006]

FIG. 2 is a view showing one of the embodiments of the present invention. As shown in this figure, in the IP layer 3 of the transmitting-side host device, when the data packet transferred from the TPC layer 2 is transferred to the lower layer 4, the data packet is decomposed when passed from the TCP layer 2. An IP header with a time stamp is added to the data packet and transferred to the lower layer 4.

In the IP layer 6 of the host device on the receiving side, a time stamp is added to the TOS field of the IP header of the packet transferred from the lower layer 5 immediately before the packet is transferred to the TCP layer 7, and the packet is transferred to the TCP layer 7. To do. The TCP layer 7 reassembles the data packet and transfers it to the upper layer 8.

[0008]

As described above, according to the present invention,
In the application layer, the delay time between the application layer and the IP layer during transmission / reception can be calculated using the time stamp of the transmission side IP layer and the time stamp of the reception side IP layer. It also makes it possible to calculate the delay time between the IP layer and another layer using the time stamps of the other layers.

[Brief description of drawings]

FIG. 1 is a diagram showing a route along which a data packet is transmitted from a transmitting host device to a receiving host device.

FIG. 2 is a diagram showing one of the embodiments of the present invention.

[Explanation of symbols]

 1 sender application layer 2 sender TCP layer 3 sender IP layer 4 sender lower layer 5 receiver lower layer 6 receiver IP layer 7 receiver TCP layer 8 receiver application layer

Claims (1)

[Claims] 1. When transferring a data packet by the IP protocol, a time stamp is added to the TOS field of the IP header when the data packet is transferred from the IP layer to a lower layer at the transmitting side, and the data packet is transferred to the IP side at the receiving side. A method for adding a time stamp to a data packet, characterized by adding a time stamp to the TOS field of an IP header when transferring from a layer to an upper layer.