JPH04310034A - Protocol data unit life control system - Google Patents

Abstract

PURPOSE:To prevent a destination end system transfer rate from being reduced even when a protocol data unit is subject to tentative transfer holding. CONSTITUTION:When a protocol data unit is held by a PDU transfer holding means 3, a PDU service life reduction processing tentative stop means 4 stops the service life reduction processing tentatively. The service life reduction processing is restrated by a PDU service life reduction processing restart means 5 after the transfer holding is released.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a network layer transmission control method in a network system having a layered network architecture, and more particularly to a protocol/data unit lifespan control method.

0002

2. Description of the Related Art Conventionally, as shown in FIG. 2, in a protocol data unit (hereinafter referred to as PDU) lifespan control method in a network layer relay system, a PDU lifespan reduction process is activated by a PDU lifespan reduction process activation means 2. Regardless of the presence or absence of a temporary transfer hold instruction for a received PDU, the PDU life is always reduced in accordance with the transmission delay within the system from the time of PDU reception to the time of relay/transmission.

0003

[Problem to be Solved by the Invention] In the above-mentioned PDU lifespan control method in the conventional network layer relay system, when a PDU is temporarily put on hold in accordance with a temporary transfer hold instruction for a received PDU, the PDU lifespan is reduced due to the hold time. , the lifetime of the PDU expires before it reaches the destination end system, increasing the probability that the PDU will be discarded. Therefore, if PDUs are temporarily suspended,
There is a problem in that the delivery rate of the DU to the destination end system decreases.

SUMMARY OF THE INVENTION An object of the present invention is to provide a protocol/data unit lifetime control method that does not reduce the destination end system delivery rate even when PDUs are temporarily suspended.

[0005]

[Means for Solving the Problems] The protocol/data unit lifespan control method of the present invention is a relay system having a network layer control function of a layered network architecture, and is a protocol/data unit that is transmitted and received according to a network layer protocol. a protocol/data unit lifespan reduction process activation means for activating a protocol/data unit lifespan reduction process to reduce the protocol/data unit lifespan according to a transmission delay within the relay system upon reception of the protocol/data unit; a protocol data unit transfer hold means for holding transfer of the received protocol data unit within the relay system when transfer hold is instructed; A protocol/data unit lifespan reduction process temporary stop means for temporarily stopping the unit lifespan reduction process, and a protocol/data unit lifespan reduction process that resumes the protocol/data unit lifespan reduction process after the suspension of the protocol/data unit transfer holding means is released. The configuration includes a restarting means and a protocol/data unit transfer means for transferring the received protocol/data unit whose hold has been released to the destination end system.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram of one embodiment of the present invention.

[0008] When the relay system 1 receives a certain PDU, the PDU life reduction processing activation means 2 causes the PDU life reduction process to reduce the PDU life in accordance with the transmission delay within the relay system.
DU life reduction processing is started.

[0009] If the received PDU does not instruct temporary transfer suspension, this PDU is transferred to the PDU transfer means 6.
immediately and relayed/forwarded to the destination end system. In this case, the PDU life reduction process does not stop from the time of PDU reception to the time of relay/transmission.

On the other hand, if the PDU received by the relay system 1 indicates temporary transfer suspension, the PDU transfer suspension means 3 suspends transfer of the received PDU within the relay system 1 . Furthermore, the PDU life reduction process temporary stop means 4 temporarily stops the PDU life reduction process that reduces the life of this PDU pending transfer. Therefore, PDU
When a is pending transfer, its lifetime will not be reduced.

[0011] Afterwards, when this transfer hold is released, the PD
The PD that has been stopped by the U life reduction process restarting means 5
The U lifespan reduction process is restarted. The PDU is passed to the PDU transfer means 6 and relayed/transferred toward the destination end system.

0012

Effects of the Invention As explained above, the protocol/data unit lifespan control method of the present invention performs the PDU lifespan reduction process while the PDU is pending transfer, when the PDU received by the relay system indicates temporary transfer suspension. The received PDU
Even if a PDU is temporarily put on hold according to the temporary transfer hold instruction, the PDU lifetime will no longer be reduced due to the transfer hold time, and the delivery rate to the destination end system will be equal to the PDU that was not temporarily put on hold. There is.

[0013] Furthermore, when the present invention is applied to a time-specified mail service via a router, it is possible to provide a mail service with an equal delivery rate without depending on the PDU hold time in the router. be.

[Brief explanation of drawings]

FIG. 1 is a block diagram of one embodiment of the present invention.

FIG. 2 is a block diagram showing a conventional protocol/data unit lifespan control method.

[Explanation of symbols]

1 Relay system 2 PDU life reduction processing activation means 3 PD
U transfer suspension means 4 PDU life reduction processing temporary stop means 5
PDU life reduction processing restart means 6 PDU transfer means

Claims (1)

[Claims] 1. A relay system having a network layer control function of a layered network architecture, the relay system transmitting and receiving protocol data according to a transmission delay within the relay system when receiving a protocol data unit transmitted and received according to a network layer protocol. a protocol/data unit lifespan reduction process activation means for activating a protocol/data unit lifespan reduction process to reduce the unit lifespan; and a protocol/data unit lifespan reduction process activation means for activating a protocol/data unit lifespan reduction process to reduce the unit lifespan; a protocol/data unit transfer holding means for suspending transfer of the received protocol/data unit within the relay system; and a temporary protocol/data unit lifespan reduction process for temporarily suspending the protocol/data unit lifespan reduction process while the received protocol/data unit is on hold. stopping means; a protocol/data unit lifespan reduction process restarting means for restarting the protocol/data unit lifespan reduction process after the suspension of the protocol/data unit transfer holding means is released;
1. A protocol/data unit lifespan control method, comprising: a protocol/data unit transfer means for transferring a data unit to a destination end system.