JPH118632A - Priority control system for asynchronous transfer mode exchange - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize an ATM exchange with high processing capability as an exchange system by designating an optional information element for a call control signaling message to revise the priority of message processing with respect to the asynchronous transfer mode exchange that acquires/releases a common resource in the exchange by the call control signaling message. SOLUTION: The ATM exchange 100 is provided with a priority control information storage means 120 that stores file data for priority control and with a priority revision means 110 that extracts an information element registered in the priority control information storage means based on a received call control signaling message and changes the processing order of the call control signaling message according to the priority decided by the priority control information storage means. Then the priority revision means 110 executes call control of the call control signaling message whose processing order is replaced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an asynchronous transfer mode switch for capturing and releasing common resources in a switch by using a call control signaling message.

An asynchronous transfer mode switch (Asynchronous Tr)
ansfer Mode switch, hereinafter referred to as ATM switch)
Call control signaling messages from terminals (ITU-T Q.293
1, Q.2761 to Q.2764, specified in ATM Forum UNI3.0, 3.1, 4.0, etc.), common resources in the exchange (hereinafter referred to as exchange resources), for example, line bandwidth, VP bandwidth, call control transaction, etc. Are communicated by releasing the captured resources when the communication is completed.

In this ATM communication, information to be communicated is divided into data of a fixed length of 48 bytes, and 5
The data is transferred as fixed-length data to which byte destination information (referred to as a header) is added. In the ATM exchange, the destination of the cell is determined from the header information of each cell, and communication is performed by sending the cell to a specified line and a specified terminal. In the ATM communication, by allocating a small number of cells to low-speed information and allocating many cells to high-speed information, communication from low to high speed can be performed flexibly, and voice, data, and images can be transmitted. This is a communication method suitable for multimedia communication such as communication.

There is a demand for flexible control of congestion of an ATM exchange used in such ATM communication.

[0005]

2. Description of the Related Art FIG. 14 is a diagram for explaining a conventional example. In the figure, reference numerals 101 to 103 denote ATM exchanges, 110A is a call control device for executing call control processing, 120A is a network for outputting input cells to a specified path, and 151 is an interface between a terminal and the ATM exchange 100. User Network Interface (U in the figure)
NI), 152 are ATM switches 10i, j (i,
j indicates any one of 1, 2, and 3).
rface is shown as NNI in the figure), 160 is a buffer memory,
T11 to T1n and T21 to T2n indicate terminals, and L1 and L2 indicate lines.

FIG. 1 shows a terminal T12 accommodated in an ATM exchange 101 and a terminal T21 accommodated in an ATM exchange 102.
Is in communication, the terminal T1n sends a call setup request SETUP (1) to the terminal T2n, and then the terminal T11 sends a call setup request SETUP to the terminal T22.
(2) is transmitted, and finally, from the terminal T21, the terminal T1
2 shows a state in which the call release request RELEASE (3) for 2 has been sent.

FIG. 15 is a diagram for explaining a cell for ATM communication. As described above, the ATM communication cell includes a 5-byte header and a 48-byte information field, and the header includes a virtual channel (Virtual Chassis).
nnel, hereinafter referred to as VC), Virtual Path (Virtual Pat)
h, hereinafter referred to as VP), a header error control area, and a cell loss priority control area.

In the conventional example described with reference to FIG.
The exchange 10i processes call processing requests from a plurality of terminals Tij simultaneously and multiplexed. The call processing request is held in the buffer memory 160 as a processing waiting queue.
The TM exchange 10i performs processing in the order in which the call processing requests are received.

[0009]

As described in the above-mentioned conventional example, a plurality of terminals T are included in the ATM switch 10i.
The call processing request from ij is received, connected to a queue as a processing waiting queue, and the processing is performed in order from the first call processing request. In such call processing, the ATM exchange 10i captures and processes exchange resources such as a line band, a VP band, and a call control transaction. The more switching resources are secured, the lower the processing capacity of the processing unit for maintaining the switching resources and the lower the processing capacity of the switching system.

[0010] Therefore, once the switching system is in a congested state, the processing capacity of the entire system is reduced, processing is delayed, and a problem occurs in that a call processing request from a user is stagnated in a waiting queue. If there is a call setting request from a user in such a state, it is highly likely that the call setting request will be rejected due to a shortage of exchange resources, and the call rejection will cause the user to make another call setting request. As a result, there is a problem that a call processing request from a user falls into a vicious cycle in which the call processing request accumulates in a queue.

In order to avoid such a problem, when the system is in a congested state, priority is given to the call release processing to release the exchange resources which the system has acquired and to improve the processing capacity of the system. Is improved, and the rejection of the call setting request is reduced, so that the occurrence of the call setting request again can be prevented.

[0012] For example, an example of ITU-T Q.2931 signaling will be described. A VP with a bandwidth of 100 Mbps is set between the ATM exchange 101 and the ATM exchange 102, and 80 Mbps is already used, and the unused bandwidth is 20 Mbps.
bps. In this state, if a SETUP (2) message requesting a bandwidth of 30 Mbps is received, the SETUP (2) message is rejected because the required bandwidth cannot be secured. However, if a RELEASE (3) message using a bandwidth of 10 Mbps or more is received, the RELEASE (3) message and the previous SET are used.
By changing the processing order of the UP (2) message, the SETUP (2) message is processed without being rejected.

The present invention aims to realize an ATM switch having a high processing capability as a switching system by designating an arbitrary information element of a call control signaling message and changing the priority of message processing.

[0014]

FIG. 1 is a diagram for explaining the principle of the present invention. In the figure, reference numeral 100 denotes an ATM exchange that performs communication by capturing and releasing common resources in the exchange according to a call control signaling message.

In the present invention, priority control information storage means 120 for storing filter data for performing priority control in ATM exchange 100, and information registered in priority control information storage means 120 from a received call control signaling message. Priority changing means 11 for extracting elements and changing the processing order of call control signaling messages according to the priority determined by priority control information storage means 120
0 is provided.

With this configuration, when receiving the call control signaling message, the priority change unit 110 extracts the information element specified by the filter data registered in the priority control information storage unit 120 from the call control signaling message, and By changing the processing order of the call control signaling messages according to the priority specified by the data, it is possible to avoid the congestion state of the entire switching system and prevent the processing capacity from being reduced.

[0017]

FIG. 2 shows an embodiment (1) of the present invention.
FIG. In the figure, 100 denotes an ATM switch, 111 denotes a priority change processing unit, 121 denotes filter data, 122 denotes priority control data, 131 denotes a call control transaction, 132 denotes a call control execution unit, 151 denotes a UNI,
152 is an NNI.

In this configuration, the priority change processing unit 1
11 stores the call control signaling message received from the UNI 151 and the NNI 152 in the reception buffer 112, and extracts information elements registered in the filter data 121 from the reception buffer 112. If the low priority information elements match, capture the call control transaction 131,
The number of the call control transaction 131 captured in the priority control data 122 is recorded. The number of the captured call control transaction 131 is attached to the end of a wait queue (not shown) of the call control execution unit 132.

When the high-priority information elements match, the call control transaction 131 is captured, the priority control data 122 is referred to, and if the call control transaction number is set, the captured call control transaction 131 is detected.
Is inserted before the call control transaction 131 extracted from the priority control data 122, and the link of the wait queue of the call control execution unit 132 is changed. When the extracted information element does not match the filter data 121, the captured call control transaction 131 is attached to the end of the wait queue of the call control execution unit 132.

The call control execution unit 132 extracts the call control transaction 131 at the head of the waiting queue and executes a call control process. FIG. 3 is a flowchart showing a process of changing the priority according to the present invention. In the embodiment (1) shown in FIG. 2, the priority change processing is performed by the priority change processing unit in S1.
The process is performed by executing the process of the call control execution unit in S2 and executing the process of the resource management unit in S3.

FIG. 4 is a flowchart showing the processing of the priority change processing unit according to the present invention. Here, the priority change processing when the QOS parameter is specified in the information element of the call control signaling message as the priority change target will be described. In the filter data 121, QOS class 1 (highest quality designation) is set as a high priority information element, and QOS classes 2 to 4 are set as low priority information elements.

STEP (hereinafter, referred to as S) 1; receives a call control signaling message. S2: SETUP requesting QOS class 4
When (1) is received, the received message is set in the reception buffer 112, the call control transaction 131 is captured, and the transaction number is set to 1.

S3: The information element specified by the low priority information element of the filter data 121 is extracted from the reception buffer 112 and compared. Since the specified information element is the QOS class, and the QOS class 4 is equal to the low priority information element, the process proceeds to S7. When the QOS class is equal to the high priority information element, the process proceeds to S4.

S4: Further, upon receiving SETUP (2) requesting the QOS class 1, after executing the processing of S1 to S3, it compares with the high priority information element. S5: QOS class 1 is determined to be a high priority information element, and call control transaction 1 of a message of a low priority information element
It is determined whether or not 31 is attached to the waiting queue.

S6: Since the low priority transaction number 1 attached earlier is set in the priority control data 122, the current captured call control transaction 131
(Transaction number 2) is inserted before transaction number 1 in the waiting queue, and the link information in the transaction is rewritten. The process of changing this link
This is a process generally performed in queue control, and a description thereof is omitted here.

S7: The capture transaction number 1 is set in the priority control data 122. S8: Attach to the end of the call control wait queue. FIG. 5 shows a processing flowchart of the call control execution unit of the present invention. The call control execution unit 132 operates independently of the priority change processing unit 111, and is started periodically by a central control unit (not shown). It is assumed that the call control execution unit 132 has been activated in a state where the waiting queue has been generated by the processing described with reference to FIG.

Steps S1, S2 and S7 will be described later. S3: Search for the first transaction in the waiting queue. S4: Here, the call control transaction number 2 of SETUP (2) is detached from the waiting queue, and SETUP (2) is detached.
Executes call control processing corresponding to the message.

S5: Executed call control transaction 1
It is determined whether or not 31 is registered in the priority control data 122. Here, since the transaction number 2 is not registered in the priority control data 122, the process ends.

Since the call control execution unit 132 processes only one transaction in one cycle, S1 to S4 are executed in the next cycle, and the transaction number 1 of SETUP (1)
Is executed. At S5, call control transaction number 1
Is registered in the priority control data 122, the transaction number 1 is deleted from the priority control data 122, and the process ends.

With this processing, priority control is performed by the QOS class. FIG. 6 shows an embodiment (2) of the present invention.
FIG. The filter data shown in FIG. 2 sets the call establishment message to a low priority and the call release message to a high priority when it detects that the usage rate of the switching resources exceeds the usage rate threshold in the configuration of FIG. A resource management unit 140 that creates the 121, a resource monitoring unit 141 that determines whether the usage rate of the exchange resources exceeds the usage rate set in the resource management target data 142, and a management data of the exchange resources necessary for the call control. The configuration is such that the resource management target data 142 to be stored is added.

In the configuration shown in the figure, the resource monitoring unit 141 monitors the usage rate of the exchange resources,
When the usage rate of the resource designated as No. 2 exceeds the usage rate threshold value, the resource management unit 140 sets the filter data 121 for setting the call establishment type message to low priority and the call release type message to high priority. The priority change processing unit 111 creates and switches the queue according to the setting of the filter data 121, and the call control execution unit 132 executes the process from the call control transaction 131 at the head of the queue.

FIG. 7 is a view for explaining an embodiment (3) of the present invention. In FIG. 6, the resource monitoring unit 141 shown in FIG. 6 is constituted by a line use band monitoring unit 143, and the resource management target data 142 is constituted by line band management data 144.

In this configuration, the bandwidth used for each line is monitored by the line bandwidth monitor 143, and if the bandwidth exceeds the priority control bandwidth set for each line without the line bandwidth management data 144, the resource management is performed. The unit 140 creates the filter data 121 for setting the call establishment message to a low priority and the call release message to a high priority.

Priority change processing section 111, call control execution section 1
The operation of 32 is the same operation as described in the flowcharts of FIGS. FIG. 8 is a diagram (part 1) for explaining the data configuration of the present invention. (A) is the filter data 121
And a parameter column for system information D11, line information D12, and VP information D13 is provided. The system information D11 includes a high-priority information element, a low-priority information element, an allowable number,
A parameter column for line information is provided.
12 includes a line number of a line to be changed in priority, a high-priority information element, a low-priority information element, an allowable number, and a parameter column of line VP information. A VP identification number, a high-priority information element, a low-priority information element, and an allowable number parameter column of the target VP are provided.

(B) shows call control transaction data, which includes a transaction in-use table and a parameter column of a call control transaction section. The bits in the transaction in-use table correspond to the transaction numbers. Indicates inside. The call control transaction unit is provided with a transaction number, link information of a waiting queue of the call control execution unit 132, a maximum delay timer, received message information referred to by the call control execution unit 132, and a parameter column of a call control work area. .

FIG. 9 is a diagram (part 2) for explaining the data structure of the present invention. (C) shows the priority control degree data 122, which has parameter columns for system information D31, line information D32, and VP information D33. The system information D31 includes a parameter column for a change counter and a capture transaction number (or a capture transaction chain list). The line information D32 includes a line number,
A parameter column for a change counter, a capture transaction number (or a capture transaction chain list), and VP information is provided. The VP information D33 includes a parameter column for a VP identification number, a change counter, and a capture transaction number (or a capture transaction chain list). Is provided.

(D) shows the resource management target data 142, which is provided with parameter columns for system information D41, line band information D42, and VP band information D43. The system information D41 includes a priority parameter designating a plurality of management target priorities and call control data block information,
In the call control data block information, a high-priority information element, a low-priority information element, the number of used priority-changed call control data blocks and the allowable number thereof are registered. In the line band information D42, a line number, a high-priority information element, a low-priority information element, a priority change use band, and an allowable number thereof are registered for each line. VP
In the band information D43, a VP identification number, a high-priority information element, a low-priority information element, a priority change use band, and an allowable number thereof are registered for each VP. These parameters can have multiple ranges.

FIG. 10 is a flowchart showing the processing of the resource management unit according to the present invention. Here, the operation of executing the priority control processing using the data shown in FIGS. 8 and 9 in the configuration shown in the embodiment (2) of FIG. 6 will be described.

A description will now be given of a dynamic priority change process when a call control data block is specified from among the exchange resources as a management target for changing the priority. In this case, the total number of call control data blocks is 5, the number of call control data blocks in use is 2, and the call control data block information of the resource management target data 142 includes the message type RELEA in the high-priority information element.
SE, message type SETUP in the low priority information element,
It is assumed that the number of used priority change call control data blocks is 3, and the allowable number is not set.

Here, the operation of receiving a call control signaling message and performing call control is the same as the processing described with reference to FIGS. In S4 of FIG. 5, the call control transaction (transaction number 1) of SETUP (1) at the head of the waiting queue is detached from the waiting queue,
A call control process corresponding to the ETUP message is executed.
Here, one call control data block is captured, the call control data block usage counter of the call control execution unit 132 is counted up, and the resource control unit 140 is notified. The resource management unit 140 performs processing according to the following flowchart.

S1: The resource management target data 142 is referred to. S2: Call control data block information is registered in the resource management target data 142, and the resource monitoring unit 141 changes the number of call control data blocks used and the priority of the resource management target data 142 notified from the call control execution unit 132. It is compared with the number of call control data blocks to determine whether or not the number is equal to or more than the threshold for changing the priority. Here, the number of call control data blocks used is 3
Which is equal to or greater than the threshold.

S3: Since it is equal to or larger than the priority change threshold,
Next, it is determined whether or not the filter data 121 has been created. S4: Here, since the filter data 121 has not been created for the information on the call control data block, the filter data 121 is created.

S5: Since the call control data block is system information, the message type RELEASE is set to the high priority information element and the message type SETUP is set to the low priority information element of the filter data 121.

Next, it is assumed that SETUP (2) and SETUP (3) are received before the call control execution unit 132 executes the processing. The call control execution unit 132 further captures two call control data blocks and notifies the resource management unit 140. The resource management unit 140 executes S1 and S2. At this time, since the filter data 121 has been created,
The creation of the filter data 121 in S4 is skipped.

If SETUP (4) and RELEASE (5) are received before the call control execution 132 of the next cycle is executed, the priority change processing unit 111 and the call control execution unit 1
32 changes the order of processing in accordance with the priority;
Processing is performed in the order of ELEASE (5) and SETUP (4). That is, the call control execution unit 132 releases one call control data block and captures one. Since the total number of call control data blocks is five, if SETUP (4) has been processed first, the number of call control data blocks will be insufficient, and the call control request will be rejected. In this way, by giving priority to the processing of the release system at the time of congestion, the call rejection rate can be reduced.

As an example of resource management, FIG.
An example in which priority processing is performed according to the band used by the line will be described. In the configuration of FIG.
As the line number, the number EN of the line L1 of the NNI 152
1. RELEAS of message type in high priority information element
E, SETUP of the message type is set to the low priority information element, 80 Mbps is set to the priority use band, and the allowable number is not set. Here, the physical band of the line L1 of the NNI 152 is 10
It is assumed that 0 Mbps, of which 60 Mbps is already used.

NN is stored in the waiting queue of the call control
Message SETUP of line L1 from I152
(1) The message SETUP (2) of the line L2 is linked and requests a bandwidth of 20 Mbps, respectively, and the capture transaction numbers are 1 and 2.
Now, the call control execution unit 132 sends the line L1 from the NNI 152.
80Mbps bandwidth use notification is received.

Therefore, the line use band monitoring unit 143 refers to the line band management data 144 in accordance with the flowchart of FIG. 10 described above. Here, since the line band information is specified, the line use band notified to the call control execution unit 132 is compared with the priority change band of the NNI 152 specified in the line band management data 144. N
Since the used bandwidth of 80 Mbps of the line L1 of the NI 152 is equal to or more than the priority change band, the filter data 121 is set, and the message type RELEASE,
The message type SETUP is set in the low priority information element.

Before the call control execution program of the next cycle is executed, the bandwidth request 10 from the line L1 of the NNI 152
Mbps (3) is received. Since the SETUP (3) is the low-priority information element of the line number EN1, the priority change processing unit 111
The line number EN1 and the capture transaction number 3 are registered in the line information parameter of (1).

The call control execution unit 132 performs a subtraction process of the maximum delay timer according to the flowchart of FIG.
The call control transaction 131 of SETUP (1) at the head of the wait queue is detached from the wait queue, and call control according to the received message type is executed.

The resource management unit 140 started here has N
The bandwidth used by the line L1 of the NI 152 is set to 100 Mbps by adding 20 Mbps. In this state, RELE using the 20 Mbps band of the line L1 from the NNI 152.
The ASE (4) message is received. Since RELEASE (4) is a high-priority information element of NNI 152, the priority change processing unit 111 refers to the priority control data by the line number EN1. Since the priority control data 122 is set to the capture transaction number 3, the transaction number 3 in the wait queue of the call control execution unit 132
To change the link.

After this, if no call control signaling message is received until all the waiting queues have been processed,
The call control execution unit 132 executes the call control transaction 131 from the head of the waiting queue. First, transaction number 2 is processed, and 20 Mbps is added to the bandwidth used by the line L2 of the NNI 152. Next, the transaction number 4 is processed, and the bandwidth used by the line L1 of the NNI 152 is reduced by 20 Mbps to 80 Mbps. Next, transaction number 3 is processed and NNI 152
10 Mbps is added to the band used by the line L1 of
Mbps. At this time, since the executed transaction number is registered in the priority control data, this transaction number is deleted from the priority control data.

With this operation, the priority change level is set in the line band, and when the band used by the line exceeds that level, the RELEASE process is executed with priority, thereby reducing call rejection in congestion. Can be done.

FIG. 7 shows an embodiment in which a priority change level is set for a line band and management is performed. In the same manner, management can be performed for each VP band by replacing the line band with a VP band. It is.

In this case, since the VP identification information is set only in the call setting message, REL is added to the high priority information element.
When SETUP is set to the EASE and the low priority information element, a correspondence table between the call number and the VP identification information is prepared in order to identify the VP released by the RELEASE, and when it is determined that the information element is the high priority information element, VP of filter data
It is necessary to convert an identification number into a call number and perform filtering.

FIG. 11 is a view for explaining an embodiment (4) of the present invention. In the figure, the resource management target data 142 having the configuration of the embodiment (2) described with reference to FIG. 6 is composed of the multi-level resource management target data 145 and extracted according to the priority set in the multi-level priority management data 145. The processing order is changed by the number of allowable priority changes.

In the embodiment (4), a plurality of levels of priorities are set, and the priorities are changed stepwise.
An example will be described in which the VP band of the exchange resource is specified as the priority change target. Multi-level resource management target data 145
VP information includes VP1 as the VP identification number, RELEASE for the high-priority information element, and SETU for the low-priority information element.
P, 60 Mbps for priority change band 1, 1 for the allowable number, 80 Mbps for priority change band 2, 2 for the allowable number
Is an example in which is registered. It is also assumed that the allocated bandwidth of VP1 is 100 Mbps, and 70 Mbps has already been used.

The resource management unit 140, according to the flowchart of FIG.
Please refer to FIG. Now, the used bandwidth of VP1 is 70 Mbps.
And the priority change bandwidth is 60 Mbps or more,
The filter data 121 is set. Filter data 12
1, the VP band information parameter includes the VP identification number
1, the allowable number is 1, RELEASE is set for the high priority information element, and SETUP is set for the low priority information element. Further, it is assumed that the message of VP1, SETUP (1), and SETUP (2) are linked to the waiting queue of the call control execution unit 132, and each of them requests a bandwidth of 5 Mbps.

Before the processing of the call control execution unit 132 in the next cycle, the RELEA using the 5 Mbps band of the VP1 was used.
When the message of SE (3) is received, the priority change processing unit 111 transmits the priority control data 122 to VP1 because RELEASE (3) is a high priority information element of VP1.
To refer to. Assuming that the priority control data 122 has a SET
Assuming that the capture transaction number 2 of UP (2) has already been set, since the capture transaction number has already been set, it is inserted before the transaction number 2 in the wait queue of the call control execution unit 132 to change the link. Then, 1 is set to the priority change counter of the priority control data 122.

The call control execution unit 132 performs a SETUP (1) transaction process. The started resource management unit 140 executes the resource management process. The bandwidth used for VP1 is 75 Mbps with the addition of 5 Mbps, is not less than the priority change band 1 and less than the priority change band 2, and the processing is terminated because the filter data 121 has already been created.

Prior to the processing of the call control execution unit 132 in the next cycle, the RELE of the VP1 using the bandwidth of 20 Mbps.
When ASE (4) is received, RELEASE (4)
Is a high-priority information element of VP1, the priority control data is referred to by VP1, and the capture transaction number 2 is set.
It is determined whether or not the number of filter data 121 is less than the allowable number.
In this case, since the count value of the priority change counter is 2, which is equal to or larger than the allowable number, the link is not changed and the end of the waiting queue, that is, after the transaction number 2, is attached. Further, the priority change counter is reset.

Thereafter, assuming that the call control signaling message is not received until all the processes in the waiting queue are completed, the call control executing unit 132 processes from the head of the waiting queue. First, the RE of transaction number 3
LEASE (3) is processed, and 5
Mbps is subtracted. Next, transaction number 2
SETUP (2) is processed, and 5
Mbps is added to 75 Mbps. Next, RELEASE (4) of transaction number 4 is processed,
20 Mbps is subtracted from the used bandwidth of VP1 to 55 Mbps
ps.

By such an operation, addition of the used band,
Subtraction is performed, and the used band is 80M of the priority change band 2
If it exceeds bps, the priority change band 2 of the resource management target data is referred to, filter data 121 in which the allowable number 2 is set is created, and the waiting queue is rearranged according to the filter data 121. Therefore, the number of priorities to be changed is suppressed in accordance with the resource usage, so that it is possible to prevent the occurrence of excessive priority changes.

FIG. 12 is a flowchart (part 2) of the process performed by the resource management unit according to the present invention. Up to now, an example has been described in which a single exchange resource is designated for management. However, it is also possible to simultaneously manage different types of exchange resources by providing a plurality of resource management target data sections (not shown).
Here, call control data blocks,
An example in which a line band and a VP band are designated will be described. It is assumed that priorities are registered in the order of the call control data block, the line band, and the VP band in the priority parameter as the multiple resource management target data. Priority registration, for example,
A method of coding each monitoring target with a numeral and registering the monitoring target in order of priority can be considered. NNI15 for line bandwidth
2 is set, and NNI 152 is set in the VP information.
It is assumed that the information of the VP1 accommodated in is set. It is also assumed that the total number of call control data blocks is 100, the number of priority change uses is 80, and 50 are already used. The physical bandwidth of the NNI 152 is 100 Mbps.
The priority change bandwidth is 80 Mbps, 60 Mbps is already used, and the assigned bandwidth of VP1 is 50 Mbps,
It is assumed that the priority change band is 30 Mbps, and 10 Mbps has already been used.

Here, the call setting request is sent to the call control
, And 20 Mbps is added to the band of VP1 accommodated in the NNI 152. Call control execution unit 1
32 notifies the resource management unit 140 of the exchange resource usage changed by the call control process. Specifically, the number of call control data blocks used is 51, and the NNI line usage band is 8
0 Mbps and VP1 line usage bandwidth of 30 Mbps are notified.

The resource management unit 140 first refers to the multi-level resource management target data 145 by the processing in S1 of the flowchart described with reference to FIG. FIG. 12 shows a detailed flowchart of the reference processing of the multi-level resource management target data 145.

S1: First, 1 is set to the information reference counter. S2: Refer to the call control data block information which is the first priority parameter of the multi-level resource management target data 145.

S3: Since the call control data block information has the first priority, the filter data 121 to be monitored with higher priority
Does not exist. Since the number of call control data blocks used is equal to or less than the priority change usage amount and there is no filter data 121, 2
In the cycle, the information reference counter is updated in S1,
Reference is made to the second-priority line band information.

The NNI 15 registered in the line band information
The priority change band of No. 2 is checked. Since the filter data 121 relating to the call control data block to be monitored for the higher priority of the line band is not set, the processing of the resource management flowchart of FIG. 10 is performed. At this time, NNI1
Since the line use band 52 exceeds the priority change band and there is no filter data 121, the filter data 121
Is created, and the search for the line bandwidth information in the priority control data 122 ends.

Next, in the third cycle, the information reference counter is updated in S1, and the third priority VP band information is referred to. Since the filter data 121 has already been created for the NNI 152, which is the higher priority monitoring target of the VP1, the NNI 152
The search for VP information for I is skipped. The relationship between the VP identification number and the line number can be known from the configuration of the resource management target data. Thereafter, each process is executed according to the information set in the filter data 121.

FIG. 13 is a view for explaining the embodiment (5) of the present invention. The configuration shown in the figure is the same as that of the embodiment (2) described with reference to FIG. 6 except that the timer 133 is provided to prevent the call control transaction 131 from being unduly held for a long time due to the change of the priority. .

The priority change program captures the call control transaction 131 in the process shown in S2 of FIG. Then, the maximum allowable delay time of the timer 133 according to the message type is set in the maximum delay time parameter of the call control transaction 131. This maximum delay allowable time is set to a time that does not cause the user to feel a delay. And
In S1 of FIG. 5, the call control execution unit 132 subtracts the maximum allowable delay time of all the call control transactions 131 in the waiting queue. If there is a call control transaction 131 in which the timer 133 has become 0 in S2, this call control transaction 131 is attached to the head of the waiting queue in S7, the link is changed, and this processing is repeated in S3. Then, the call control transactions 131 in which 0 of the timer 133 is detected are linked in order from the head next, and when the search of all the call control transactions 131 in the waiting queue is completed, the steps after S4 are performed. An execution process of the call control transaction 131 is performed.

As described above, the call control transaction 13
By setting the maximum permissible delay time for each one, performing the subtraction process for the specified time, and executing the call control process from the time when the timer 133 becomes 0, it is possible to prevent an unduly long hold.

[0074]

According to the present invention, switching control can be efficiently performed by designating an arbitrary information element in a call control signaling message, changing the priority, and rearranging the call control signaling message. . For example, by specifying the QOS in the call control signaling message, it is possible to give priority to the processing of a call that requires high quality.

Further, the common resource management processing required for call control and the priority change processing are linked. For example, in the event of system congestion, prioritizing resource release processing over call establishment processing enables effective use of switching resources, improving the maximum processing capacity of the switching equipment and reducing the memory capacity of the switching equipment. it can.

Further, the priority processing can be performed by using the bandwidth of the line and the usage rate of the VP band as the common resources. It is also possible to set a plurality of levels instead of a single level for changing the priority. At this time, specify the number of permissible processing rearrangements according to the priority level By doing so, it is possible to eliminate the adverse effects caused by excessive priority change, and it is also possible to set the priority change process to a plurality of exchange resources as management targets,
By managing the maximum hold time using the timer, it is possible to prevent an unduly long hold due to the priority change.

[Brief description of the drawings]

FIG. 1 illustrates the principle of the present invention.

FIG. 2 illustrates an embodiment (1) of the present invention.

FIG. 3 is a processing flowchart of priority change according to the present invention;

FIG. 4 is a processing flowchart of a priority change processing unit according to the present invention;

FIG. 5 is a flowchart of a call control execution unit according to the present invention.

FIG. 6 illustrates an embodiment (2) of the present invention.

FIG. 7 illustrates an embodiment (3) of the present invention.

FIG. 8 is a view for explaining the data structure of the present invention (part 1)

FIG. 9 is a view for explaining the data configuration of the present invention (part 2)

FIG. 10 is a processing flowchart (part 1) of the resource management unit of the present invention.

FIG. 11 illustrates an embodiment (4) of the present invention.

FIG. 12 is a processing flowchart (part 2) of the resource management unit of the present invention.

FIG. 13 is a diagram illustrating Embodiment (5) of the present invention.

FIG. 14 illustrates a conventional example.

FIG. 15 is a diagram illustrating a cell for ATM communication.

[Explanation of symbols]

 100, 101 to 103 ATM switch 110 Priority change unit 110A Call control device 111 Priority change processing unit 112 Receive buffer 120 Priority control information storage unit 120A Network 121 Filter data 122 Priority control data 131 Call control transaction 132 Call control execution unit 133 timer 140 resource management unit 141 resource monitoring unit 142 resource management target data 143 line usage band monitoring unit 144 line band management data 145 multi-level resource management target data 151 UNI 152 NNI 160 buffer memory T11-T1n, T21-T2n terminal L1, L2 line

Claims (6)

[Claims] Claims: 1. A call control signaling message comprising:
A priority control information storage means for storing filter data for performing priority control in an asynchronous transfer mode switch for capturing and releasing a common resource in the exchange, and a priority control information storage means for storing the priority control information from a received call control signaling message. A priority change means for extracting the information elements registered in the priority control information storage means and for changing the processing order of the call control signaling messages according to the priority determined by the priority control information storage means; Priority control method for an asynchronous transfer mode switch, which performs call control of a call control signaling message in which the above is replaced. 2. The priority control system for an asynchronous transfer mode switch according to claim 1, wherein said priority control information storage means stores common resource management data required for call control processing of said asynchronous transfer mode switch. A resource monitoring unit configured to monitor the usage rate of the common resource and detect that the usage rate of the common resource has exceeded a threshold; and When detecting that the threshold value is exceeded, of the call control signaling messages, a resource management unit for creating filter data for setting a call establishment message to a low priority and a call release message to a high priority is provided; An asynchronous transfer mode for performing call control of a call control signaling message whose processing order has been changed according to the filter data created by the management unit. Priority control system of the exchange. 3. The priority control method for an asynchronous transfer mode switch according to claim 2, wherein the resource management target data is constituted by line band management data for managing a used band for each line, and Monitor the bandwidth used for each line,
A line usage band monitoring unit that monitors that the usage rate of the communication line exceeds a threshold, and when the line usage band monitoring unit detects that the usage band of the communication line exceeds the threshold, the resource management unit A priority control method for an asynchronous transfer mode switch, which creates filter data for setting a call establishment message to a low priority and a call release message to a high priority among call control signaling messages related to a communication line. 4. The priority control method for an asynchronous transfer mode switch according to claim 2, wherein the resource management unit has a plurality of priority setting levels for resources to be managed, and each resource management unit has a predetermined priority setting level. When the resource usage rate exceeds each threshold value, the management target is recognized as a priority change target, and is configured with multi-level resource management target data for extracting the allowable number of priority change corresponding to the level. When the usage rate of the resource defined by the multi-level resource management target data exceeds each threshold, the priority change processing unit rearranges the processing order without the allowable number extracted from the multi-level resource management data. Priority control method for an asynchronous transfer mode switch. 5. The priority control method for an asynchronous transfer mode switch according to claim 2, wherein the resource management unit is configured to assign a priority to a plurality of different types of managed resources in accordance with the type of the managed object. And set
A plurality of resource management target data for generating filter data in which a type of management target is determined according to a resource usage rate is provided, and priority control is performed in a priority order specified by the plurality of resource management target data. Priority control method for asynchronous transfer mode switching. 6. The priority control method for an asynchronous transfer mode switch according to claim 2, wherein a timer is provided in a call control transaction of a call control signaling message, and when the timer detects that a predetermined time has elapsed. A priority control method for an asynchronous transfer mode switch, wherein the call control signaling message is processed with priority.