JPS59117354A - Device for resetting optimum route for call of permanent virtual circuit - Google Patents

Abstract

PURPOSE:To reset a call of PVC (permanent virtual circuit) by an optimum route by releasing an old route immediately after a final data packet of the old route is received after the preparation for resetting by the optimum route is finished. CONSTITUTION:When the call setting of a PVC is made by a route other than the 1st selection (optimum) route, a packet call processing section 1 transmits an information signal S0 to a PVC route monitor 2. The PVC route monitor 2 transmits a confirming signal periodically to the packet call processing section 1 to confirm the restoration of the 1st route. When the packet call processing section 1 receives a confirming signal, checks the presence of the restoration of the 1st route and responds to the PVC route monitor 2 by a confirming response signal. The PVC route monitor 2 transmits a resetting request signal to a PVC optimum route resetting device 3 at transmission side when the 1st route is restored. When the PVC optimum route resetting device 3 at transmission side receives the resetting request signal, a recalling request packet CR' is transmitted to the packet call processing section 1. The call processing section 1 transmits the packet CR' to the incoming side on the restored 1st route.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a PVC (permanent virtual circuit) call setting device for a packet switch, and in particular, to a PVC call setting device that is capable of resetting a PVC call that has been set up using a route other than the optimal route using a suitable route. The present invention relates to a PvC call optimal route reconfiguration device.

Conventionally, PvC call setup by a packet switch
Although the settings are fixed between terminals, the initial call setup is
As shown in the figure, the PVC call setting device 5 of the packet switch SW1 sends a call request packet CR'' containing the addresses of both terminals T, , T, etc. (packet call processing unit IK, the packet call processing unit 1 A call packet is sent from the packet switch SW to the packet switch SW that accommodates the destination terminal T, and the incoming call packet is sent from the packet switch SW to the terminal T.)
CN is sent, and when the incoming call acceptance packet CA is returned from the terminal T, the connection completion bucket is sent from the packet switch iQ SV/, CC is sent by the packet switch sw and y, and the call is set up on the incoming terminal TI side. At the same time, a reset indication packet RI is sent to terminal T, and terminal T
A PVC call is set up by receiving an RF (reset confirmation bucket from 2). After the PVC call is set up, data can be exchanged between it and terminals T, , T using data packets.

In other words, data packets can be sent and received immediately without having to send and receive call packets (CR, etc.) each time. Above P
When setting up a VC call, the packet call processing unit IVi performs the call setting without any distinction from a normal virtual call (VC). Therefore, when setting up a call, for example, as shown in Figure 2, if the first route line that directly connects packet switch SW1 and packet switch SW cannot be used due to a failure or congestion, etc. , the second route is selected by the originating packet switch SW, and the second route is selected due to the packet switch Sw3.
A PVC call is set up by a route. Therefore, terminal T
, , T,) is transmitted by the second route. However, even if the fault in the first route is recovered, as long as the second route is prone to call disconnections due to line faults, etc., the call setup via the second route is maintained.

Therefore, even if the above-mentioned second route is a line with high line delay such as a satellite line or a line with poor line quality, once a PVC call is set up, a call disconnection factor will occur and the call will be disconnected as much as possible. The disadvantage is that the line continues to be used.

It is an object of the present invention to solve the above-mentioned conventional drawbacks and to provide a PVC call optimization system that allows a PVC call that has been routed other than the optimal first route to be reconfigured to the first route without disconnecting the PVC call. The objective is to improve service by providing a route reconfiguration device.

The reconfiguration device of the present invention includes a PVC call setup device that issues a call request packet for PVC call setup, and a packet call processing unit that configures a PvC call between two specific terminals using the call request packet. After the above-mentioned PVC call is set up, the call setting of the above-mentioned packet call processing unit is set by a second route other than the first route, which is the optimal route, in a packet switching equipment that enables the transmission and reception of data packets between the above-mentioned specific terminals. When this happens, the call setting information of the PVC call given from the packet call processing unit and the failed first route number are stored, and the recovery of the first route is periodically opened to the packet call processing unit. A pvc route monitoring device and a resetting request signal outputted from the pvc route monitoring device due to the regeneration of the first route are input,
Sends a re-calling request packet for resetting the VC call to prepare for resetting, and upon receiving a receive ready packet for the final data packet from the second route, sends a clear request packet for releasing the second route. Pvc optimal route resetting transmitting side device, receiving the re-calling request packet and returning a call connect packet, receiving the clear request packet and returning a clear confirmation packet p v c
The packet switch is equipped with an optimal route re-establishment receiving device 6, and the packet switching device performs the fiPVc according to the prepared first route by receiving the clear confirmation packet 4fJ.
It is characterized by resetting the call.

Next, the present invention will be explained in detail with reference to the drawings.

FIG. 3 is a block diagram showing one embodiment of the present invention.
The figure is a sequence diagram showing an example of the operation. That is, the packet switch includes a conventional packet call processing unit], a PVC call setting device 5, and a PVC route monitoring device 2. PVC optimum route reconfiguration sending device 3. PVC optimal route reconfiguration reception (+-111 PVC internally comparing device 4
Equipped with a call optimum route reconfiguration device. pvc call setting device 5
Then, as in the past, a call request packet cR is sent to the packet call processing unit 1 to set up a PVC call. If so, the corresponding PV including the address of the departure and arrival terminal, etc.
C. The information signal S contains the call setup information and the number of the failed first selected route. It is then sent to the PVC route monitoring device 2.

The PVC route checking device 2 has a table storing the above information, and periodically checks the packet call processing unit 1 to confirm the recovery of the failed first route stored in the table.
A confirmation signal S8 is sent to. When the packet call processing unit 1 receives the confirmation signal S, it checks whether or not the first route has been restored, and responds to the PvC route monitoring device 2 with a confirmation response signal S. If the first route has been restored, the PVC route monitoring device 2 sends a reconfiguration request signal S to the PVC optimal route reconfiguration transmitting device 3.

When the PVC optimum route reconfiguration transmitting device N3 receives the reconfiguration request signal Ss, it sends a recall request bucket (CR') to the packet call processing unit 1. The re-call request packet CR
'H, PV in network utility field
This clearly indicates that this is a reconfiguration of a C call. Next, the packet call processing unit 1 sends the above-mentioned re-call request packet CR' to the packet switching equipment on the receiving side via the first route that has been repeated several times, and stores the call control management information for this call in the built-in resetting call control management memory IJ6. Store information temporarily.

In the packet switch on the receiving side, a similar packet call processing unit refers to the network utility field of the received packet, recognizes that it is a PVC call reconfiguration request, and sends the packet to P V CRjt overroute reconfiguration reception. Send it to the side device 4.

If the PVC optimal route resetting receiving side device 4 is able to connect, it returns the call connect packet CC to the packet call processing unit 1, and the packet call processing unit 1 transfers the packet to the packet switch on the originating side. The call control management information of the call is temporarily stored in the resetting call control management memory 6.

Packet call processing unit 11I′i of the originating packet switch;
The above call connect packet cc is sent to the PVC most J route resetting transmitting device 3, and the PVc optimal route M setting transmitting device 311. By receiving the call connect packet CC, 1') it is recognized that preparations for call resetting of the first route have been completed.

Thereafter, the final data packet sent out on the old route l)
T is received at terminal T1 and the receive ready bucket 1-
When the RR is returned, the packet is sent from the packet call processing unit 1 of the originating packet switch to the PC optimum route resetting transmitting device 3. Then, the PvC highest route re-establishment sending device 3 sends out a clear request packet CQ to release the old route. When the packet is input to the PVC optimum route resetting receiving side device 4, a clear confirmation packet CF is returned to the packet call processing unit 1 of the receiving side, and the packet call processing unit 1 on the receiving side The bucket) CF is sent to the PVC optimum route reconfiguration transmitting side device 3 on the transmitting side, and the reconfiguration call control management information stored in the reconfiguration call control management memory 6 is sent to the terminal in the same packet processing unit. to the call control management memory corresponding to the logical channel. In addition, the originating side packet switch sw, which has received the above-mentioned clear control 7 amation packet CF, similarly transfers the reconfiguration call side @I management information stored in the reconfiguration call control management memory 6 to the corresponding logical channel of the terminal. Call control ゛'#Rimeko memory. As described above, the old route is released and the PVC call based on the first route is re-established. From now on, between terminals T and T? Data packets are sent and received using the reconfigured optimal route.

FIG. 4 is a diagram showing the sequence of each packet exchange described above. The second of
After setting according to the route, the packet switch SW□,
The rotation of the first route between sw is recognized by the confirmation signal S, >- and the confirmation response signal, and a re-call request packet CR' and a call connect are sent between the PVC optimum route resetting transmitting device 3 and receiving device 4. Packet cc is sent and received,
The reception of the final data packet (DT) via the recovery route is performed by the receive ready packet RR, the clear quest packet CQ and clear confirmation packet CF are exchanged, the old route is released, and the PvC call is set up using the optimal route. The following sequence is shown. After the reset, data packets DT between the terminals T and T1 are sent and received through the first route that directly connects the packet switch 8W and SW.

As described above, the present invention includes a PVC call optimal route resetting device for resetting a PVC call set on a route other than the optimal first route to the first route after the first route is recovered. After the preparation for reconfiguration by the first route is completed, the old route is released and the PVC call reconfiguration by the first route is started immediately after the final data packet of the old route is received. Since the PvC call is configured, a PvC call that was set up through the second route can be re-established through the first route without disconnecting it. That is, pvcvf-
This has the effect of improving the quality of data transmission because the route is always set using the optimal route.

[Brief explanation of the drawings] Figure 1 is a sequence diagram showing an example of PVC call setup;
The figure shows a state in which a PvC call is set up by the second route, Figure 3 is a block diagram showing an embodiment of the present invention, and Figure 4 shows the operation sequence when resetting P■C according to the above embodiment. FIG. In the figure, 1...Packet call processing unit, 2...PV
C route monitoring device, 3--PVC optimum route resetting sending side device, 4...PVC optimum route resetting receiving side device,
5--PVC setting device, 6--Resetting call control management memo! J, Sll...information signal, S...confirmation 18
No., St... Confirmation response signal, S, --- Resetting request signal, S Wf, S W,. S'wl...Packet switch. Representative Patent Attorney Sumi 1) Sou Toshi

Claims (1)

[Claims] A PvC call setting device that outputs a call request packet for setting up a PvC call, and a packet call processing unit that sets up a PvC call between two specific terminals using the call request packet are provided. In the packet switching equipment that enables the transmission and reception of data packets between the specific two terminals, when the packet call processing section sets up a call using a second route other than the first route, which is the optimal route, the packet call processing section a PVC route monitoring device that stores the call setting information of the PVC call given from the PVC call and the failed first route number, and periodically checks the recovery of the first route with respect to the packet call processing unit; When the route is restored, a resetting request signal output from the PvC route monitoring device is input, and a resetting request packet for setting up a PVC call using the first route is sent out to prepare for resetting, and the second route is prepared for resetting.
a PvC optimal route reconfiguration transmitter device that sends a clear request packet to release the second route when receiving a receive ready packet for the final data packet by the route; The packet switch is equipped with a PVC optimum route re-establishment receiving side device which returns the clear request packet 't+[ and returns the clear confirmation packet. No. 1 provided above by
p, which is characterized by resetting a PVC call according to a route.
VC call optimal route reconfiguration device.