JPS63149938A - Packet transfer method - Google Patents

Abstract

PURPOSE:To prevent the generation of residence or abolishment of a packet without increasing a system load by storing tentatively the packet to a terminal equipment disabling the reception tentatively and transferring it to the terminal equipment enabling it to receive. CONSTITUTION:A packet addressed to a communication terminal equipment being in tentative reception disable state is stored in a data storage means 6 together with the destination. Then after the communication terminal equipment is transited to the reception enable state, the communication terminal equipment checks the presence of the packet addressed to its own equipment of a data storage means 6 if it exists, the packet to its own equipment is received from the means 6 if not exists, the presence of the packet of the reception buffer 3 on its own equipment is checked and if exists, the packet on the buffer 3 received. Thus, the residence or abolishment of the transmission data in the transmitting side communication terminal is prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to data transmission/reception control means for a packet communication network. In particular, the present invention relates to means for preventing transmitted data from being retained or discarded at a transmitting side communication terminal when the destination communication terminal is not in a receivable state due to incomplete startup or the like.

〔overview〕

The present invention provides a method for transferring packets addressed to a communication terminal device, by temporarily accumulating packets sent to a terminal device that is temporarily unable to receive packets, and transferring them to a terminal device that is able to receive the packets. , it is possible to prevent packets from being retained or discarded without increasing the system load.

[Conventional technology]

Conventionally, there have been two types of data transmission/reception control means of this type. In the first method, data is directly communicated between communication terminal devices. In the second method, a data storage device connected to a communication network is provided, the sending side communication terminal once transmits data to this data storage device, and the receiving side communication terminal transfers the data addressed to its own communication terminal device to this data storage device. Take it from.

[Problem that the invention seeks to solve]

In the first method of such conventional data transmission/reception control means, when the receiving side communication terminal device is not started up and cannot receive data, the transmitted data is retained or discarded at the sending side communication terminal device. However, there is a drawback that the processing capacity of the transmitting communication terminal device is reduced.

In addition, in the second method, the receiving terminal device must inquire of the data storage device whether data addressed to the terminal device is being sent, which has the disadvantage of increasing the load on the receiving communication terminal and the communication network. Furthermore, there is a drawback that the time required for the data transmitted by the transmitting terminal device to reach the receiving terminal device is longer than that of the first method.

SUMMARY OF THE INVENTION The present invention aims to eliminate such drawbacks and to provide a packet transfer method that reduces transmission time and does not cause transmission data to be retained or discarded.

[Means for solving problems]

The present invention provides a packet transfer method in which a packet is transferred via a communication network from one communication terminal device that receives the packet via a reception buffer provided for each communication terminal. A packet addressed to a certain communication terminal device is stored in the data storage means together with the destination, and after this communication terminal device shifts to a receiving ready state, this communication terminal device checks whether there is a packet addressed to the own device on the data storage means. If the data storage means exists, the device receives the packet destined for itself from this data storage means, and if it does not exist, it checks whether there is a packet on the reception buffer of the device itself, and if it exists, it receives the packet on this buffer. It is characterized by

[Effect]

A communication terminal device may be temporarily unable to receive data, such as when starting up. At this time, the packet sent to this device is stored in the data storage device. When the communication terminal device becomes able to receive packets, it sequentially receives the packets stored in the data storage device, and when all the packets are received, the communication terminal device receives the packets from its own buffer and resumes normal communication. Here, if the communication terminal device is in a receivable state, it directly receives the packet without going through the data storage device.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on the drawings.

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. Communication terminal devices 2 and 4 connected to packet communication network 1 have reception buffers 3 and 5, respectively, and
A data storage device w6 connected to the packet communication network 1 has a reception buffer 8, and is connected to a storage device 7 for storing data.

2 and 3 are control flow diagrams regarding data transmission and reception between the communication terminal devices 2 and 4, and FIG. 4 is a control flow diagram of the data storage device 6. In FIG.

Now, when the communication terminal device 2 transmits a data packet to the communication terminal device 4, the communication terminal device 2 first transmits the data packet directly to the communication terminal device 4 (step 31). If the transmission is successful, the process ends (step S2). However, if the transmission is unsuccessful, the data is transmitted to the data storage device 6 as data addressed to the communication terminal device 4, and the process ends (step S3).

On the other hand, data packets transmitted from the communication terminal device 2 to the communication terminal device 4 are stored in the reception buffer 5 of the communication terminal device 4. First, the communication terminal device 4 makes an inquiry to the data storage device 6 as to whether data addressed to the terminal device exists (step S4). If the data exists, a reception request is sent to the data storage device 6 (step S6);
When the data packet is received (step S7), the data storage device is again inquired about the existence of the data (step S4).
). On the other hand, if no data exists in the data storage device 6, check the reception buffer 5 of the own terminal (step S8), and if reception data exists, take the data from the reception buffer 5 (step 310) and store the data again. The presence of data in the device is confirmed (step S4). If there is no received data, the process directly returns to step S4.

In the data storage device 6, first, if there is data in the reception buffer 8 of the own device, it is retrieved (step Sll, step 512).If this data is a data packet, the data is stored in the storage area corresponding to the destination communication terminal device. to be stored (step 514), and return to the original process (step 51).
1). If this data is an inquiry packet (
Step 515) Check whether received data exists in the storage area corresponding to the requesting communication terminal device (Step 516)
). If the received data exists, the information that it exists,
If it does not exist, information indicating that it does not exist is sent to the requesting communication terminal device in step 31B and step 519.
), the process returns to the original process (step 511). If this data is a reception request packet, the oldest data is sent to the requesting communication terminal from the data storage area corresponding to the requesting communication terminal (step 522), and the process returns to the original process (step 5ll).

〔Effect of the invention〕

As explained above, the present invention transmits transmission data to a data storage device and temporarily stores the data when the other party's communication terminal device is in a state where it cannot receive data at the time of transmission.
This has the effect of preventing data from being stored or discarded at the sending terminal, and when the other party's communication terminal is normal, data can be sent directly, so the time required for sending and receiving is not unnecessarily prolonged. It has the effect of preventing

[Brief explanation of the drawing]

FIG. 1 is a block configuration diagram showing the configuration of an embodiment of the present invention. FIGS. 2 and 3 are control flow diagrams showing processing operations of the communication terminal device. FIG. 4 is a control flow diagram showing processing operations of the data storage device. 1...Packet communication network, 2.4...Communication terminal device,
3.5.8...Reception buffer, 6...Data storage device, 7...Storage device. Composition system of large scale example 1. Indictment w3 for the violation of the law. 2. Figure Ketsushinhana rice moxibustion lO receiver 18 movement shoulder. 3.

Claims (1)

[Claims] (1) In a packet transfer method in which packets are transferred via a communication network from one of the communication terminal devices that receives via a reception buffer provided for each communication terminal, reception is temporarily unavailable. After storing the packet addressed to the communication terminal device together with the destination in the data storage means and transitioning the communication terminal device to a receiving ready state, the communication terminal device checks whether there is a packet addressed to the own device on the data storage means. , if the data storage means exists, it receives the packet destined for itself from this data storage means, and if it does not exist, it checks whether there is a packet on the reception buffer of the own device, and if it exists, it receives the packet on this buffer. A packet transfer method characterized by: