CN1314231C - Self circulation method for program control exchanger - Google Patents

Abstract

A self-loop method for a program-controlled switch, comprising the following steps: sending a No. 7 self-loop request to the switch through an operation and maintenance station; The part judges whether to self-loop before sending No. 7 message to MTP-L3. If yes, exchange the source address and destination address in No. 7 message; if not, the user part directly sends No. 7 message to MTP -HMRT of L3; finally, HMRT judges whether to self-loop after receiving the No. . The invention adopts software to realize the No. 7 signaling self-loop, which overcomes the shortcomings of the original self-loop method that takes up more hardware resources and takes time and effort for commissioning, and has the advantages of being fast, simple and easy to implement.

Description

A method for self-looping of program-controlled exchange

technical field

The invention belongs to the technical field of program-controlled exchange, and in particular relates to a method for self-looping the No. 7 signaling used in the program-controlled exchange.

Background technique

With the development of digital communication technology and program-controlled switching technology, No. 7 signaling, as a signaling system most suitable for digital communication networks, has been widely used. The No. 7 signaling system is generally divided into four functional levels, namely the user part, including the telephone user part TUP, the integrated service user part ISUP and the signaling connection control part SCCP; the signaling network function level MTP-L3, including the message routing module HMRT and message distribution module HMDT; signaling link function level MTP-L2; signaling data link function level MTP-L1, as shown in Figure 1. The functions of the above four functional levels and the interfaces between them are specified in detail by the International Telecommunications Union (ITU-T), so details will not be repeated here. Among them, the telephone user part TUP and the integrated service user part ISUP can effectively transmit various call control and connection control information. At present, there are many models and signaling types of program-controlled switches in China, and problems of intercommunication between different models and different signaling methods are often encountered. In addition, due to the introduction of new services, version upgrades, and frequent tests, it is often necessary to check the TUP and ISUP The signaling function is verified and tested, and the self-loop is an effective means to achieve this purpose.

At present, the self-loop test of No. 7 signaling generally requires two 2M trunk lines in the same office direction to use the trunk self-loop line for receiving and docking, and the same time slot of each trunk line contains a No. 7 link. A loopback call can be made on the trunk only after the link is activated. Figure 2 shows a schematic diagram of the existing self-loop method. This method first needs to establish a self-loop link. Generally, the No. 7 signaling board establishes an exchangeable semi-permanent path through the digital switching network and the digital relay board, and then connects to the two time slots of the PCM system to provide two mutual loops. 64kbit/s signaling data link back. It can be seen from the figure that after the messages generated by the user part are sent to the signaling network functional level MTP-L3, they are sent to the signaling link functional level MTP-L2 by the message routing module HMRT, and then sent to the signaling data link through a semi-permanent path connection The functional level MTP-L1, after being looped back by the relay, re-enters the signaling data link functional level MTP-L1, and then sends it to the message distribution module HMDT through the signaling link functional level MTP-L2, and the latter sends into the user section.

Although this method can perform a relatively complete simulation of all levels of SS7, it has the following disadvantages:

First, this method will take up more hardware resources. Due to the establishment of a loopback data link, at least two No. 7 links and two 2M trunk lines are required. In the case of relatively sufficient free hardware resources, there will be no problem, but in the case of relatively tight or incomplete hardware resources, it will bring great inconvenience to the work.

Secondly, this method needs to eliminate the alarm of the 2M trunk line and activate the link before making a self-loop call, so it takes a period of debugging time, and because the hardware status is variable, the time required to establish a self-loop is also difficult to determine , it will take a long time when the hardware condition is not good.

At present, the connection between different models and the intercommunication between different signaling systems mainly lie in the user part of the signaling network function level above MTP-L3, including TUP, ISUP, and SCCP. In addition, the upgrade, testing, and improvement of the software version are mainly concentrated in the user part of the fourth functional level, while the parts of MTP-L3 and below are relatively stable.

Contents of the invention

Therefore, the technical problem to be solved by the present invention is to provide a self-loop method capable of simulating the signaling function of the user part of SS7 without occupying hardware resources.

The self-circulation method of the present invention comprises the following steps:

1. Initiate a No. 7 self-loop request to the switch through the operation and maintenance console;

2. The switch releases the blocking state of the relevant trunk circuit and the time slot of the switching network, making it enter the idle state;

3. Before sending No. 7 message to the signaling network functional level MTP-L3, the user part judges whether to self-loop, if yes, then go to step 4; if not, then go to step 5;

4. Exchange the source address and destination address in the No. 7 message, and process different No. 7 message sources, and then the user part sends the changed No. 7 message to the message routing of the signaling network function level MTP-L3 Module HMRT; go to step six;

5. The user part directly sends the No. 7 message to the message routing module HMRT of the signaling network functional level MTP-L3;

6. After the message routing module HMRT receives the No. 7 message sent by the user part, it judges whether to self-loop. If so, it sends the message directly to the message distribution module HMDT, and then the message distribution module HMDT sends it back to the user part; Otherwise, the No. 7 message is buffered and sent to the signaling link functional level MTP-L2, and then sent out through the physical No. 7 link.

In summary, the method of the present invention can use software to realize the No. 7 signaling self-loop, which overcomes the disadvantages of the original self-loop method that takes up more hardware resources and is time-consuming and labor-intensive for commissioning. It is fast, simple, and easy. The present invention can fully simulate various signal messages and call flow of user parts such as TUP/ISUP/SCCP, and can be used in version upgrades, tests, function verifications, It has broad application prospects in fault location analysis and other processes.

Description of drawings

Figure 1 is a schematic structural diagram of the No. 7 signaling system.

Fig. 2 is a schematic diagram of the existing self-loop method.

Fig. 3 is a schematic diagram of the self-cycling method of the present invention.

Fig. 4 is a structural schematic diagram of an embodiment of the self-loop method of the present invention.

FIG. 5 is a flow chart of the system shown in FIG. 4 to create a self-loop.

Fig. 6 is a flow chart of the process of sending No. 7 message by the user part of the system shown in Fig. 4 .

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

It can be seen from Figure 1 that the No. 7 signaling system is divided into four functional levels, including user parts, including telephone user part TUP, integrated service user part ISUP, signaling connection control part SCCP, etc.: signaling network function MTP-L3, Including message routing function HMRT, message distribution function HMDT: signaling link function MTP-L2; signaling data link function MTP-L1. The method of the invention solves the self-loop of the user part.

Figure 2 shows a schematic diagram of the existing self-loop method. After the message generated by the user part is sent to the signaling network functional level MTP-L3, the message routing module HMRT sends it to the signaling link functional level MTP-L2, and then to the signaling data link functional level MTP-L1 through a semi-permanent connection , after looping back from the loop line through the relay, it re-enters the signaling data link functional level MTP-L1, and then sends it to the message distribution module HMDT through the signaling link functional level MTP-L2, and the latter sends it to the user part. This method will occupy more hardware resources, and the required debugging time is affected by the hardware condition.

The self-circulation method of the present invention will be described in detail below in conjunction with FIG. 3 . As can be seen from Fig. 3, the core of the present invention is that after the message generated by the user part is sent to the signaling network functional level MTP-L3, it is directly sent to the message distribution module HMDT by its message routing module HMRT, and then sent to the user part by the latter Instead of going through the signaling link function level MTP-L2 and the signaling data link function level MTP-L1. Therefore, this method does not need to establish a self-loop link, nor does it need the cooperation of hardware resources such as the No. 7 signaling board, digital relay board, and relay self-loop line.

When the user initiates the No. 7 self-loop request through the operation and maintenance console, the main control module of the switch sends a single board reset message to the switch database, and the database releases the zero-slot hardware blockage of all PCMs on the single board, and then the main control module sends a message to the database Send PCM unblocking message and signaling point reachable message, and the database will release the fault blocking of the PCM and the time slot blocking from the switching network to the PCM, and release the signaling blocking and remote blocking of the trunk group related to the signaling point . This is because the trunk circuit and the time slot of the switching network must be unblocked to enter the idle state, and only the resources in the idle state can be occupied during the call. Therefore, before sending the No. 7 message, the trunk circuit needs to be The time slot of the road and switching network enters the idle state, so that it can be occupied in the call and simulate the real call flow.

The user part must judge whether to self-loop before sending No. 7 message each time. If it wants to self-loop, exchange the source signaling point code OPC and destination signaling point code DPC of the No. 7 message to be sent, that is, exchange the source address and the destination address, this is because the message distribution module HMDT of the MTP-L3 at the signaling network function level must judge whether the destination address is itself every time it receives a No. Discard the message. Zihuan is actually sending and receiving by itself, but under normal circumstances, the message sent out is sent by oneself to be received by others, and when it is received, it can only be sent by others and received by itself. Therefore, the present invention has done a process when sending, that is, exchanging the destination address and the source address, so that the message changes from "send by yourself to others to receive" to "send by others to receive by yourself", so that the message returned by the loop can be successfully received by the message distribution module HMDT . If no self-loop is required, the No. 7 message is directly sent to the message routing module HMRT of the signaling network function level MTP-L3.

For the No. 7 message sent by the telephone user part TUP or the integrated service user part ISUP, it is necessary to judge whether the circuit identification code CIC of the No. 7 message is less than a given value, and if so, then the circuit identification code of the No. 7 message Add an incremental value to the CIC, otherwise, subtract the incremental value from the circuit identification code CIC of the No. 7 message. If it is the No. 7 message sent by the SCCP, the calling user address CGA is exchanged with the called user address CDA. Then send the changed No. 7 message to the message routing module HMRT of MTP-L3.

After the message routing module HMRT receives the No. 7 message sent by the user part, it judges whether to self-loop, if so, sends the message directly to the message distribution module HMDT, and then sends it back to the user part by the message distribution module HMDT; otherwise , and send the message to the signaling link function level MTP-L2 after being cached.

Fig. 4 shows the structure schematic diagram of an embodiment of using the self-circulation method of the present invention. This embodiment consists of two parts, the foreground 11 and the background 21. Front desk 11 includes network interface card 16 , main control module 12 , No. 7 user part 13 , HMRT module 14 , HMDT module 17 , and database 15 . The background 21 includes an operation and maintenance interface 22; the front desk 11 and the background 21 are connected through an internal local area network. Among them, the main control module 12 is used to process command requests from the background and forward messages between the front and back; the database 15 stores the static configuration data and dynamic status data of the system, including trunk groups, office directions, and signaling point access status, etc., and also provides an interface for external modules to access the database.

The working process of creating the No. 7 soft self-loop by the system shown in FIG. 4 is now described in conjunction with FIG. 5 .

First, configure necessary data for the system through the operation and maintenance interface 22 , including creating the No. 7 signaling point, the No. 7 trunk group, etc., that is, step 101 . Then initiate the No. 7 soft self-loop request through the operation and maintenance interface 22, step 102, which includes two PCMs 32 to be self-looped, the middle CIC value 33 and the CIC incremental value 34, etc., and the latter two data are only sent for TUP/ISUP news. The No. 7 soft self-loop request is sent to the main control module 12 through the network interface card 16 .

After main control module 12 receives this request, at first with soft self-loop sign 31, two PCM 32 that will self-loop, middle CIC value 33 and CIC incremental value 34 are saved with the form of global variable, step 103. The main control module 12 sends "single board reset message" (step 104) to the database 15, wherein the single board referred to is the digital trunk board where the PCM 32 that will self-loop is located. This message indicates that the relevant board has been powered on and entered the online state. After receiving the message, the database 15 releases the hardware blocks such as TS0 of all PCMs on the single board (step 105). Then main control module 12 sends " PCM unblocking message " (step 106) to database 15, wherein the PCM that refers is the PCM 32 that will self-loop. This message indicates that the related PCM sending and receiving alarm has been cleared. After the database 15 receives the message, it unblocks the failure of the PCM, and simultaneously unblocks the time slot from the digital switching network to the PCM (step 107). Then the main control module 12 sends a "signaling point reachable message" to the database 15 (step 108), wherein the signaling point indicated is the signaling point corresponding to the trunk group where the PCM32 to be self-looped is located. This message indicates that the relevant signaling point is reachable. After receiving the message, the database 15 releases the signaling blocking and remote blocking of the trunk group related to the signaling point (step 109). So far, the PCM 32 and its related time slots to be self-looped have entered the idle state, and all the steps required for setting up soft self-loops have been completed, and the next step can occupy these trunks and time slots to call.

The flow of sending No. 7 message by the user part in the system shown in FIG. 4 will be described below with reference to FIG. 6 .

At first, the user part 13 first judges whether the soft self-loop sign 31 is true (step 121) before No. 7 message is sent to the signaling network function level MTP-L3:

If it is true, then the source signaling point coding OPC and the destination signaling point coding DPC of the No. 7 message are exchanged (step 122), and then different processes are carried out according to whether the user part 13 is TUP/ISUP or SCCP. If it is TUP/ISUP, then judge whether the CIC of the No. 7 message is less than the middle CIC value 33 (step 123), if yes, then add the CIC incremental value 34 (step 124) to the CIC of the No. 7 message, otherwise , subtract the CIC incremental value 34 (step 125) from the CIC of the No. 7 message, and then send the changed No. 7 message to the HMRT module 14 of the signaling network function level; if the user part 13 is an SCCP, then the The calling party address CGA is exchanged with the called party address CDA (step 126), and then the modified No. 7 message is sent to the HMRT module 14 of the signaling network function level MTP-L3 (step 127).

If it is false, the No. 7 message is directly sent to the HMRT module 14 of the signaling network function level MTP-L3.

Finally, after the HMRT module 14 receives the No. 7 message sent by the user part, it judges whether the soft self-loop sign 31 is true (step 128), and if true, the message is sent to the HMDT module 17 (step 129). Otherwise, according to the normal processing flow, the message is sent to MTP-L2 after being cached (step 130).

In summary, a self-loop method of a program-controlled exchange according to the present invention establishes a direct virtual link between the sending module and the receiving module, and simultaneously simulates various single boards, PCMs, and signaling point ready messages , make relevant relay and time slot resources available, so that calls and circuit/circuit group operations can be performed, realizing the purpose of simulating various message signal processes of the No. 7 signaling user part by pure software method without hardware resources. The user only needs to input a command on the operation and maintenance interface to realize the self-loop of the No. 7 signaling user part, thereby greatly reducing the workload, and it has a good effect when the hardware resources are insufficient.

Claims (8)

1, a kind of stored-program control exchange is characterized in that: may further comprise the steps from the method for ring:

One, initiates the request of a soft ring certainly of Signaling System Number 7 by the Operation and Maintenance platform to switch;

Two, switch is removed the blocked state of relevant repeat circuit and switching network time slot, makes it to enter idle condition;

Three, User Part is before sending Signaling System Number 7 message to signaling network functional level MTP-L3, and judging whether will be from ring, if then forward step 4 to; If not, then forward step 5 to;

Four, source address in the Signaling System Number 7 message and destination address are exchanged, and handle at different Signaling System Number 7 informed sources, the Signaling System Number 7 message after User Part will be changed is then issued the message routing module HMRT of signaling network functional level MTP-L3; Go to step 6;

Five, User Part directly sends to Signaling System Number 7 message the message routing module HMRT of signaling network functional level MTP-L3;

Six, after message routing module HMRT received the Signaling System Number 7 message that User Part sends, judging whether will be from ring, if, then message is directly mail to Message Distribution Module HMDT, send back to User Part by Message Distribution Module again; Otherwise, Signaling System Number 7 message is sent to signaling link function level MTP-L2 after by buffer memory, send by No. seven links of physics again.

2, as claimed in claim 1 from the ring method, it is characterized in that: described step 2 comprises the following steps,

1) main control module of switch is removed the zero time slot hardware obturation of all PCM on the veneer to switch database transmitting single plate reset message by database;

2) main control module sends PCM to database and separates and close message, removes the time slot obturation of the inaccessible and switching network of the fault of this PCM to this PCM by database;

3) main control module can reach message to database transmission signalling point, is removed the signaling obturation and the far-end obturation of the relevant trunk group of this signalling point by database.

3, as claimed in claim 2 from the ring method, it is characterized in that: described veneer is will be from the Digital Trunk Board at the PCM place of encircling.

4, as claimed in claim 2 from the ring method, it is characterized in that: described PCM is will be from the PCM of ring.

5, as claimed in claim 2 from the ring method, it is characterized in that: described signalling point is will be from the trunk group corresponding signaling point at the PCM place of encircling.

6, as claimed in claim 1 from the ring method, it is characterized in that: handle according to No. seven different informed sources in the described step 4, may further comprise the steps: No. seven message of sending for Telephone User Part TUP or integrated service User Part ISUP, need to judge that whether the cic circuit identification code CIC of this Signaling System Number 7 message is less than set-point, if, then the cic circuit identification code CIC with these No. seven message adds an increment size, otherwise, the cic circuit identification code CIC of these No. seven message is deducted increment size; If No. seven message that SCCP SCCP sends, then with calling party address CGA and called subscriber address CDA exchange.

7, as claimed in claim 6 from the ring method, it is characterized in that: described set-point is middle CIC value.

8, as claimed in claim 1 from the ring method, it is characterized in that: whether judging whether in described step 3 and the step 6 will be to indicate for really judging from ring according to soft from ring.

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