KR20010028683A - Method of Hunting AO Channel in the AODI Service - Google Patents

Abstract

PURPOSE: The method for hunting an AO(Analog Output) channel in an AODI(Always On Dynamic ISDN) service, is provided to supply an AO service for multi subscriber by using one AO channel, and to analyze channel traffic through a call count management of a private AO channel so that an optimum serviceable call number can be decided. CONSTITUTION: An independent table is generated for managing an AO(Analog Output) channel in an AODI(Always On Dynamic ISDN) service(S1). AO calls capable of being included in a private AO channel are counted(S2). Whether to hunt an AO channel is decided by using management information of the AO call count(S3). And AO channel hunting is performed to select an AO channel(S4).

Description

How to Hunt Ao Channel in Ao Dai Service {Method of Hunting AO Channel in the AODI Service}

The present invention relates to an AO channel hunting method in an AODI service, and more particularly, to an AO channel hunting method in an AODI service for improving the efficiency of performing channel hunting for AO required to perform an AODI function in an exchange.

In general, AODI is implemented based on the existing exchange and Bandwidth Allocation Control Protocol (BACP), where AO is implemented in the form of X.25 packets, and the calling party is connected to the D-channel packet and directly linked with the exchange. The RAS (Remote Access Service), which acts as a server for Transmission Control Protocol (TCP) / IP (Internet Protocol) to provide services, connects with B-channel packets, and DI connects with general ISDN data calls. According to the purpose, short data is delivered in the form of always connected AO, and B-channel is automatically allocated and released when more bandwidth is needed without the need for additional dialing. Here, the existing exchange that can handle the ISDN subscriber includes an X.25 packet handler function. In addition, the AO call refers to D-channel packet access on the calling side and B-channel packet access on the called RAS for performing the AO function.

The basic idea behind the AODI is that ISDN D-channel X.25 calls occur between clients and Internet service providers (ISPs). Multilink Protocol (MLP) and TCP / IP are delivered by D-channel. It is encapsulated in a logical circuit. In this case, the B-channel does not use the Q.922 and X.25 encapsulation used in the D-channel, but directly uses the MLP, that is, a circuit switched connection between the subscriber and the ISP is performed on the B-channel. In this case, IP packets are delivered through PPP (Point to Point Protocol) encapsulation.

And, of course, using X.25 on the D-channel is not the most efficient protocol stack, but it is possible to use the existing packet handlers in the exchange to implement AODI. The link is used as the Primary Link (PL) of the MLP.

Then, a simple configuration for the conventional AODI service, as shown in Figure 1, the personal computer (PC) 11, the local exchange 12, the ISP 13, the Internet network 14, the packet network ( 14).

Here, AO uses Packet Data Capability (PDS), which is part of the ISDN standard, and the subscriber establishes a packet connection to the ISP 13 on the D-channel, and the bidirectional connection is established by the subscriber. 11) on, and when the connection is established, the subscriber can exchange data such as e-mail.

If there is a lot of information that cannot be handled by a 16K D-channel packet connection, the line connection is established using one or two ISDN B-channels, which are automatically established without subscriber involvement. Kbps) is guaranteed. When the transmission of data ends, the line connection is released and the subscriber is online again on the D-channel.

However, there was no structure for selecting an AO channel to provide the AODI service. However, since the purpose of one channel was not the same service as the purpose of the AO channel for the AODI service, in order to send and receive a packet call, After selecting a channel and seizing and using the selected channel, the channel resource is returned so that the used channel can be reused.

In other words, a scheme of using a B-channel for general call processing purpose allocates an available channel to a channel allocation request of a child process of each call processing block. In addition, the channel is used in the call processing block to perform its own purpose, and then the channel resources are released to be used again. That is, when one individual channel is occupied by a specific process, the channel is used. Cannot be provided to other users.

Meanwhile, the channel allocation scenario of the local exchange occupies the B-channel, reports the occupancy of the corresponding B-channel to the PBXC, and puts the channel information required by the network on the Q.931 Set-up message to the called subscriber. The ISDN modem used by the called subscriber responds with the available channel with a Q.931 Connect message, and the network is configured to indicate that the corresponding channel is in use, and the network transmits the packet to the agreed B channel. It establishes a Link Access Procedure Balanced (LAPB) data link to attempt a call, and follows a form of attempting a packet call to a called party.

As such, the conventional channel usage cannot perform a service for multiple users as the purpose of the AO channel of the AODI service because the operation and the service are performed under the assumption of a single user service. In addition, in the operation of the conventional AO channel, there was no function to dynamically manage the number of service providing subscribers per channel that can be accommodated in one channel dynamically according to the increase and decrease of call traffic.

SUMMARY OF THE INVENTION In order to solve the problems as described above, the present invention is to improve the efficiency of the AO channel hunting performance required to perform the AODI function in the national exchange to be suitable for the original function of the channel for the AO.

In other words, the present invention provides an AO service for multiple subscribers by using one AO channel by hunting an AO channel to provide an AODI service, and actually operates by managing call counts of individual AO channels. The purpose of this study is to analyze the channel traffic of the city and to determine and operate the optimal number of service calls per channel. In addition, the present invention changes the information of the AO channel present in a separate line of the actual AODI service to reflect the changed content in the system that is dynamically operated, the hunting of the AO channel is managed by one SNP AO channel group can be managed by packing physically separated RAS into logical group so that efficient distributed processing is possible. In addition, an object of the present invention is to provide a convenient operator management command by the built-in function to query and modify the corresponding information for the AO channel.

1 is a block diagram illustrating a configuration for a conventional Always on Dynamic Integrated Services Digital Network (AODI) service.

2 is a block diagram illustrating a configuration for AO channel hunting in an AODI service according to an embodiment of the present invention.

3 is a flowchart illustrating an AO channel hunting method in an AODI service according to an embodiment of the present invention.

FIG. 4 is a diagram illustrating an association between a structure of an AO hunting table for hunting an AO channel and an existing PBX hunting group in FIG. 3; FIG.

Explanation of symbols on the main parts of the drawings

20: Switching Subsystem Processor (SSP)

30: Switching Network Processor (SNP)

40: receiving side SSP

21: Packet Subscriber Call Control (PSC)

22, 32: NTR (Number Translation)

31: Private Branch Exchange Control (PBXC)

41, 42: receiving side PSC

AO channel hunting method in the AODI service according to an embodiment of the present invention for achieving the above object comprises the steps of generating an independent table that can manage the AO channel in the AODI service; Managing a count of AO calls acceptable to an individual AO channel; Determining whether to hunt an AO channel using management information of the AO call count; AO channel hunting is performed by selecting a channel for AO. Here, the generated AO channel management table may include SSP information and line information allocated to the AO channel, a hunting group number, and information about the number of calls that can be accommodated in the AO channel. The AO channel selection process may include: checking whether an AO channel is allocated to a specific PRI circuit in the AO channel allocation and unassignment table; Comparing the number of calls accommodated in the AO channel with the number acceptable in one AO channel; Selecting a corresponding AO channel if the number of calls received on the particular AO channel is less than the number acceptable to one AO channel; And increasing the call count of the selected AO channel. In addition, the step of determining whether or not the AO channel allocation step comprises the step of finding a corresponding group number using the index of the AO channel allocation and unassigned table; Searching an AO group table using the found group number; And if the AO group is registered, checking whether the AO channel is allocated by searching the AO channel table.

Alternatively, the AO channel hunting method in the AODI service according to an embodiment of the present invention further comprises the step of performing the management of changing and querying the information stored in the generated AO channel management table according to the operator's command It is done.

In addition, the AO channel hunting method in the AODI service according to an embodiment of the present invention further comprises the step of maintaining the consistency of the AO call count by performing initialization when the state information initialization of the AO channel required. do.

According to the present invention, it is possible to support multi-subscriber service of a single B-channel through management of AO channel among AODI services, and at the same time, according to traffic increase and decrease of individual AO channel in actual network operation, It optimizes the number, and manages the call count that can be provided in the channel in an independent table during the management operation of the AO channel, and determines whether or not to hunt a specific channel by using the information in the SNP. To allow AO channels to be logically grouped together. Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the AODI service according to the embodiment of the present invention, the configuration for hunting of the AO channel is largely composed of a sending side SSP 20, an SNP 30, and a receiving side SSP 40, as shown in FIG. 2. Here, the SSPs 20 and 30 are sub-systems that provide a switching service to the subscribers by mounting the subscribers in the exchange, and the SNPs 30 are sub-systems that perform number translation and call occupancy functions at the exchanges.

The originating side SSP 20 includes an originating side PSC 21, which is a packet subscriber call processing originating process, and an NTR 22 that is responsible for a called party number translation function.

The SNP 30 analyzes a message applied from the PBXC 31, which is a call processing block responsible for call control of the exchange, and the originating SSP 20, and applies it to the receiving side SSP 40. NTR 32 is included.

The receiving side SSP 40 includes a plurality of receiving side PSCs 41 and 42 which are packet subscriber call processing incoming and outgoing processes.

AO channel hunting method in the AODI service according to an embodiment of the present invention will be described with reference to the flowchart of FIG. 3 as follows.

First, to create an independent table that can manage the channel for AO (step S1), that is, to create a table that stores the channel information for AO. Here, the contents of the generated table include the SSP information and line information to which the channel for the AO is allocated, the hunting group number, and the number of calls that can be accepted in the channel.

In addition, to manage the contents stored in the table, the information of the AO channel can be changed and inquired according to the operation needs of the operator. That is, the information of the AO channel stored in the table is changed according to the operator's change command or the current state of the information of the AO channel stored in the table is inquired according to the operator's inquiry command.

Then, the number of AO calls that can be accommodated in the AO channel is managed (step S2), that is, the number of AO calls that can be accommodated in an individual AO channel is managed dynamically to accommodate the specific AO channel according to the increase or decrease of traffic of the corresponding AO channel. Manage the number of possible AO calls.

Then, AO channel hunting is performed to select the AO channel (step S3). The AO channel is selected by comparing the number of calls currently accommodated in a specific AO channel with the number set to be accommodated in one AO channel. This selects or selects the next AO channel and increments the current call count for that selected AO channel.

In addition, in order to maintain the consistency of the call count of the AO channel between the SNP and the SSP (step S4), when the current state information of the AO channel is required to be initialized due to an external condition by the state management of the exchange. If the initialization is necessary, the SSP that performs the AO service and the SNP that performs AO channel hunting recognize this and perform the initialization.

On the other hand, in the third process (S3) to manage the information necessary when performing the AO channel hunting in the SNP, this is AO channel resources that exist in the entire system as well as AO channel resources in a single SSP hunting of the AO channel Can be used efficiently.

In addition, the relationship between the structure of the AO hunting table for hunting of the AO channel and the existing PBX hunting group is as follows.

The hunting of the AO channel is based on the PBX hunting group for the existing DI call, and the information on some of the circuits is processed in a separate table for AO hunting. The association with the existing PBX hunting group is shown in FIG. 4. As shown in.

In this case, the station number assignment for the DI call and the station number assignment for the AO are not distinguished, and the hunting group number when the call is received using the DI call and the hunting group number when the call is received using the AO call are the same. Do.

In order to search whether an AO channel is allocated to a specific Primary Rate Interface (PRI) line in the AO channel allocation and unassignment table in the group table of the PBX hunting group, an index of the corresponding AO channel allocation and unassignment table is used. Find the group number by using, search the AO group table of the AO hunting group by using the found group number, and search the AO channel table when the AO group is registered as a result of the search and finally use it Do it.

Next, the third process S3 will be described with reference to the degree of matching between the AO channel hunting performing software blocks shown in FIG. 2.

First, the calling party PSC 21, which is a packet subscriber higher call control block provided in the calling party SSP 20, generates a packet number translation request message and is provided in the calling party SSP 20. The NTR 22 is applied to request the packet number translation (step S3-1). At this time, the AO flag (ao_flag) in the corresponding packet number translation request message is set to true.

Accordingly, the NTR 22 confirms whether the type of the call requesting the number translation from the PSC 21 is a local call, and then resends the packet number translation request message to the NTR 32 provided in the SNP 30. (Step S3-2).

The NTR 32, after recognizing that the type of the call requesting the number translation is a local call, searches for the called subscriber line and selects the type of the called subscriber line as a group link (gln) or independent link (Independent Link). If not, a term set-up request message is generated and sent to the receiving side SSP 40 which is the called line (step S3-3). At this time, the hunt flag (hunt_flag) in the corresponding tum setup request message is set to false.

On the other hand, if the type of the called subscriber line is group link (gln), individual link (iln) and the AO flag (ao_flag) in the packet number translation request message of the calling party PSC 21 is set to true, The NTR 32 uses a group number of a corresponding line and is provided in the SNP 30 so as to request hunting of an AO channel to the PBXC 31 performing idle line hunting in the PBX group. A packet PBX term request message is generated and sent to the corresponding PBXC 31 (step S3-4).

Accordingly, the PBXC 31 that receives the first packet PBX term request message hunts an AO channel in the group, and selects a channel having a small number of calls being performed in each channel among the AO channels in the group and selects the selected channel. Set the hunt flag (hunt_flag) in the tum setup request message to true, and designate an AO channel and send it to the receiving side SSP 40 as a result of the hunting (step S3-5).

If the first receiving side PSC 41 provided in the receiving side SSP 40 that has received the tertiary setup request message from the PBXC 31 cannot proceed to the corresponding channel call of the called line, The first receiving side PSC 41 checks whether or not the hunt flag hunt_flag in the tum setup request message of the PBXC 31 is set to true, and if the first receiving side PSC 41 is set to true; The PBXC 31 generates a second packet PBX tum request message for requesting the hunting of the AO channel and sends the PBXC 31 to the PBXC 31 to perform channel hunting (step S3-6).

Then, the terminating setup request message is sent to the second receiving side PSC 42 provided in the receiving side SSP 40, for example, as the incoming line using the line selected by rehunting in the PBXC 31 ( Steps S3-7). At this time, the hunt flag (hunt_flag) in the corresponding tum setup request message is set to true.

On the other hand, when the first receiving side PSC 41 can proceed to the corresponding channel call of the called line, the first receiving side PSC 41 performs a procedure for connecting an AO call to the corresponding channel of the called line. To check whether the hunt flag (hunt_flag) in the tertiary setup request message of the PBXC 31 is set to true, and if it is set to true, perform a procedure for connecting an AO call to the corresponding channel (step). S3-8) On the other hand, when the hunt flag (hunt_flag) is set to false, the same process as the existing call processing procedure is performed.

On the other hand, the second receiving side PSC 42 also performs the same operation as the first receiving side PSC 41 (step S3-9).

As described above, by hunting the channel for AO to provide AODI service according to the present invention, it is possible to provide AO service to multiple subscribers using one AO channel, and through call count management of individual AO channels, By analyzing the channel traffic during operation, it is possible to determine and operate the optimal number of serviceable calls per channel.

In addition, according to the present invention, by changing the information of the AO channel present in a separate line in the actual AODI service, the corresponding change can be reflected in the system operating dynamically, since the hunting of the AO channel is managed in the SNP, AO channel group can be managed by packing physically separated RAS into logical group for efficient distributed processing.

In addition, the present invention provides a convenient operator management command is built in the ability to query and modify the corresponding information for the AO channel.

Claims (6)

Creating an independent table for managing an AO channel in an AODI service; Managing a count of AO calls acceptable to an individual AO channel; Determining whether to hunt an AO channel using management information of the AO call count; The AO channel hunting method in the AO DIA service, comprising performing the AO channel hunting and selecting a channel for the AO. The method of claim 1, The generated AO channel management table includes the SSP information to which the AO channel is allocated, line information, a hunting group number, and information about the number of calls that can be accepted in the AO channel. The method of claim 1, The AO channel selection process may include checking whether an AO channel is allocated to a specific PRI circuit in the AO channel allocation and unassignment table; Comparing the number of calls accommodated in the AO channel with the number acceptable in one AO channel; Selecting a corresponding AO channel if the number of calls received on the particular AO channel is less than the number acceptable to one AO channel; And increasing the call count of the selected AO channel. The method of claim 3, The step of checking whether the AO channel is allocated includes: finding a corresponding group number by using an index of the AO channel allocation and unassignment table; Searching an AO group table using the found group number; And searching the AO channel table to determine whether an AO channel is allocated when the AO group is registered. The method of claim 1, The AO channel hunting method of the AEDIA service further comprises the step of performing the management of the change and the information stored in the generated AO channel management table according to the operator's command. The method of claim 1, And performing initialization when the state information initialization of the AO channel is required to maintain consistency of the AO call count.