JPH024063A - Packet switching system - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a packet switching method that can simplify the call setting operation of an originating packet terminal device in a packet switching system and improve the usage efficiency of the packet switching system. The purpose is to enable call setup without reducing operability and efficiency of use of the packet switching system. a calling side call setting means for setting up a first call between the calling side packet terminal device and the packet switch when receiving a calling request to the destination side packet terminal device transmitted from the device; and a calling side call setting means; By means of the first call established by the means;
In parallel with the setting of the first call by the storage means for accumulating data transmitted from the originating packet terminal device and the originating call setting means, a second call is attempted to be established for the destination packet terminal device; If a second call is set up, 1. The packet switch is configured to include a destination call setting means for transferring the data stored in the storage means to the destination packet terminal device through the established second call.

[Industrial application field]

The present invention relates to a packet switching system that can simplify the call setting operation of a calling packet terminal device in a packet switching system and improve the usage efficiency of the packet switching system.

[Prior Art] FIG. 4 is a diagram illustrating an example of a conventional packet switching system, and FIG. 5 is a diagram illustrating a conventional packet communication process.

In FIGS. 4 and 5, the originating packet terminal device 2 accommodated in the originating packet switch 1 performs packet communication with the destination packet terminal device 4 accommodated in the destination packet switching device 3. Then, a call request bucket (CR) specifying the destination packet terminal device 4 is transmitted to the originating packet switch 1.

Originating packet switch 1 that received the CR (call request bucket)
transfers the call request packet CR to the destination packet switch 3 that accommodates the destination packet terminal device 4.

The destination packet switch 3 receives the received call request packet C.
The incoming call packet CN is transmitted to the destination packet terminal device 4 designated as R.

When the destination packet terminal device 4 that has received the incoming call packet CN is in a communication-disabled state, it returns a recovery request packet (CQ) to the destination packet switch 3.

The destination packet switch 3 receives the received recovery request packet C.
Q is transferred to the originating packet switch 1, and at the same time, a recovery confirmation packet CF is returned to the destination packet terminal device 4.

Originating packet switch 1 that received the recovery request packet CQ
returns a disconnection instruction packet CI to the originating packet terminal device 2.

The originating packet terminal device 2 that received the disconnection instruction packet switch 1-Cl confirms that the call setup for the destination packet terminal device 4 was unsuccessful, and sends a disconnection confirmation packet, )CF, to the originating packet switch 1. The call setting request to the destination packet terminal device 4 is temporarily canceled by sending it back.

After a while, the originating packet terminal device 2 transmits a call request packet CR to the originating packet switch 1 in order to try again to set up a call to the destination packet terminal device 4. The called packet 1-CN is transmitted from the exchange 3 to the destination packet terminal device 4.

This time, when the destination packet terminal device 4 that has received the incoming call packet CN is in a communicable state, it returns the incoming call acceptance packet CA to the destination packet switch 3.

The destination packet switch 3 that received the incoming call acceptance packet cA sends a connection completion bucket to the originating packet switch 1)
Return CC.

The originating packet switch 1 receives the received connection completion packet C.
C is transferred to the originating packet terminal device 2.

The originating packet terminal device 2 that has received the connection completion packet CC confirms that the call setup for the destination packet terminal device 4 has been successful, and creates a data packet DT containing the data to be transmitted to the destination packet terminal device 4. Then, it is transmitted to the destination packet terminal device 4 via the originating packet switch 1 and the destination packet switch 3.

[Problem to be solved by the invention]

As is clear from the above explanation, in a conventional packet switching system, when a call setup request is received from the originating packet terminal device 2, the destination packet terminal device 4 is in a communicable state, and the incoming call accepting Pakeso I-CA is It can be set only if the call is returned, and if the destination paget terminal device 4 is in a communication-disabled state and returns the recovery request packet CQ, it cannot be set, and until the call is set, the call setup request is needs to be repeated, which reduces the operability of the originating packet terminal device 2, and various packets for call setup are transferred invalidly within the packet switching system, resulting in a reduction in the usage efficiency of the packet switching system. was there.

SUMMARY OF THE INVENTION An object of the present invention is to enable call setup without reducing the operability of a calling packet terminal device and the efficiency of using a packet switching system.

[Means to solve the problem]

FIG. 1 is a diagram showing the principle of the present invention.

In FIG. 1, 100 is a packet switch constituting the packet switching system that is the subject of the present invention, 2 is an originating packet terminal device accommodated in the packet switch 100, and 4 is an originating packet terminal device 2 for packet communication. This is the target destination packet terminal device.

Reference numeral 200 denotes a calling side call setting means provided within the packet switch 100 according to the present invention.

Reference numeral 300 denotes storage means provided within the packet switch 100 according to the present invention.

Reference numeral 400 denotes called call setting means provided within the packet switch 100 according to the present invention.

[Effect]

The originating side call setting means 200 performs packet exchange with the originating side packet terminal apparatus 2 when receiving a call request to the terminating side packet terminal apparatus 4 transmitted from the originating side packet terminal apparatus 2 accommodated in the packet switch 100. A first call is set up with 6100.

The storage means 300 stores data transmitted from the originating packet terminal device 2 by the first call set by the originating call setting means 200.

The terminating call setting means 400 attempts to set up a second call to the terminating packet terminal device 4 in parallel with the first call setting by the originating call setting means 2°O, and the second call is set. When the data is stored in the storage means 300, the data stored in the storage means 300 is transferred to the destination packet terminal device 4 through the set second call.

Therefore, the originating packet terminal device can transmit data addressed to the destination packet terminal device to the accommodated packet switch, regardless of the communication status of the destination packet terminal device, and the communication is disabled. There is no need to repeat call setup for the destination packet terminal device located at the destination packet terminal device, the operability of the originating packet terminal device is improved, and the usage efficiency of the packet switching system is improved.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a diagram illustrating a packet switching system according to an embodiment of the present invention, and FIG. 3 is a diagram illustrating a packet communication process according to an embodiment of the present invention. Note that the same reference numerals indicate the same objects throughout the figures.

In FIG. 2, the packet switch 10 in FIG.
The originating side packet switch 1 is shown as 0, and the originating side call setting unit 11 is shown as the originating side call setting means 200, the storage means 300, and the terminating side call setting means 400 in FIG.
, a storage section 12 and a called call setting section I3 are provided in the originating packet switch [1].

In FIGS. 2 and 3, an originating packet terminal device 2 accommodated in an originating packet switch 1 performs packet communication with a terminating packet terminal device 4 accommodated in a terminating packet switch 3. Then, it transmits a call request request +-CR specifying the destination packet terminal device 4 to the originating packet switch 1.

The originating packet switch 1, which has received the call request request 1-CR, uses the originating call setting unit 11 to send the originating packet terminal device 2 to the originating packet terminal device 2.
A connection completion packet CC is sent back to the originating packet terminal device 2, and a call is set up with the originating packet terminal device 2. At the same time, the destination call setting unit 13 sends a call to the destination packet switch 3 that accommodates the destination packet terminal device 4. The call request packet CR is transferred and a call setup with the destination packet/node terminal device 4 is attempted.

The originating Pakenote terminal device 2 that has received the connection completion packet CC determines that the call setup with the originating packet switch 1 has been successful, and sends the data packet DT containing the data to be transferred to the destination packet terminal device 4. It is created and sent to the originating packet switch 1, and when all data packets DT have been sent, a recovery request bucket (CQ) is sent.

The originating packet switch l receives the data packet DT transmitted from the originating packet terminal device 2, stores it in the storage unit 12, and then receives the recovery request packet CQ.
The originating call setting unit 11 returns a recovery confirmation packet CF to the originating packet terminal device 2, and releases the call set up with the originating packet terminal device 2.

On the other hand, the destination packet switch 3 is connected to the originating packet switch 1.
The called packet CN is transmitted to the called packet terminal device 4 specified in the called request packet CR transferred from the call request packet CR.

Destination packet terminal device 4 that received the incoming packet terminal l-CN
If communication is disabled, it returns a recovery request packet CQ to the destination packet switch 3.

The destination packet switch 3 receives the received recovery request packet switch 1-
The CQ is transferred to the originating packet switch 1.

Originating packet switch 1 that received the recovery request packet CQ
is set by the destination call setting unit 13 to the destination packet terminal device 4.
It confirms that the call setup was unsuccessful, returns a recovery confirmation packet CF to the destination packet terminal device 4 via the destination packet switch 3, and requests call setup to the destination packet terminal device 4. will be resolved once.

After canceling the call setup request to the destination packet terminal device 4, the originating packet switch 1 causes the destination call setting unit 13 to set up the call to the destination packet terminal device 4 again after a predetermined period of time has elapsed. When a call request packet CR is sent to the terminating packet switch 3 in order to try, the terminating packet 1-CN is transmitted from the terminating packet switch 3 to the terminating packet terminal device 4 in the same process as described above.

This time, if the destination packet terminal device 4 that has received the incoming call packet CN is in a communicable state, the incoming call reception bucket 1-CA
is returned to the destination packet switch 3.

Destination packet switch 3 that received the incoming call acceptance packet CA
is a connection completion packet C sent to the originating packet switch 1.
Return C.

Originating packet switch 1 that received the connection completion packet CC
is set by the destination call setting unit 13 to the destination packet terminal device 4.
The data packet DT stored in the storage unit 12 and addressed to the destination packet terminal device 4 is extracted, and sent to the destination packet terminal via the destination packet switch 3. When all data packets DT have been transferred to the device 4, a disconnection instruction packet CI is sent to the destination packet terminal device 4 via the destination packet switch 3, and communication with the destination packet terminal device 4 is completed. Release the call that was set up in between.

When the destination packet terminal device 4 receives the data packet terminal 1-DT transferred via the destination packet switch 3 and further receives the disconnection instruction packet CI, the destination packet terminal device 4 transfers the data packet terminal device 4 to the originating packet switch via the destination packet switch 3. A disconnection confirmation packet CF is returned to 1.

As is clear from the above description, according to this embodiment, when the originating packet switch 1 receives a call request from the originating packet terminal device 2 to the destination packet terminal device 4, the originating packet switch 1 The calling side call setting unit 11 sets up a call with the calling side packet terminal device 2 regardless of the availability status, receives and stores all data packets DT transmitted from the calling side packet terminal device 2, and sends the call to the calling side packet terminal device 2. When a call is set up with the packet terminal device 4, the accumulated data packet 1-DT is transferred to the destination packet terminal device 4.

Therefore, the originating packet terminal device 2 can complete the transmission of the data packet DT to be transmitted to the destination packet terminal device 4, regardless of the communication availability state of the destination packet terminal device 4. There is no need to repeatedly try to set up a call until 4 becomes able to communicate.

It should be noted that FIGS. 2 and 3 are only one embodiment of the present invention, and for example, the packet communication process between the originating packet switch 1 and the destination packet terminal device 4 is limited to what is illustrated. Although it is considered that the destination packet terminal device 4 that first received the incoming call packet CN is in a communicable state, in such a case, the destination call setting unit 13 Immediately upon receiving the connection completion packet CC returned from the storage unit 12, the data bucket) DT stored in the storage unit 12 is sequentially transferred to the destination packet terminal device 4 via the destination packet switch 3, and other operations are performed. Although the following modifications are considered, the effects of the present invention remain unchanged in either case. It goes without saying that the packet switching system to which the present invention is applied is not limited to that shown in the drawings.

〔Effect of the invention〕

As described above, according to the present invention, in the packet switching system 7), the originating packet terminal device sends the destination packet terminal device to the accommodating packet switch regardless of the communication availability status of the destination packet terminal device. data can be transmitted, there is no need to repeat call setup for a destination packet terminal device that is unable to communicate, the operability of the originating packet terminal device is improved, and the usage efficiency of the packet switching system is improved. improves.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing a packet switching system according to an embodiment of the present invention, FIG. 3 is a diagram showing a packet communication process according to an embodiment of the present invention, and FIG.
The figure shows an example of a conventional packet switching system, and FIG. 5 is a diagram illustrating a conventional packet communication process. In the figure, 1 is the originating packet switch and 2 is the originating packet switch.
7 a terminal device, 3 a destination packet switch, 4 a destination packet terminal device, 11 an originating call setting section, 12 a storage section, 1
Reference numeral 3 denotes a called call setting section, 100 a packet switch, and 200 a call setting means for an originating side. Pub built in wood, Soto Tsushin 1jJL Ryo Diagram 0 Aro pub yto dust Nutem No. 4 Diagram Φ in rice A5 no Ke, Soto final name Shi program diagram

Claims (1)

Claims: In a packet switching system comprising one or more packet switches (100), a destination packet terminal device transmitting from an originating packet terminal device (2) accommodated in the packet switch (100); (4) a calling side call setting means (200) for setting up a first call between the calling side packet terminal device (2) and the packet switch (100) when a calling request for the calling side is received; an accumulating means (300) for accumulating data transmitted from the originating packet terminal device (2) by the first call set by the originating call setting means (200); In parallel with the setting of the first call by the destination packet terminal device (4), an attempt is made to set up a second call to the destination packet terminal device (4), and when the second call is set, the storage means ( terminating side call setting means (400) for transferring the data stored in 300) to the terminating side packet terminal device (4) through the established second call; A packet switching method characterized by providing.