KR19990004517A - Message Handling Method Using Level 2 Firmware in Mobile Switching System - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

Digital mobile switching center

2. The technical problem to be solved by the invention

Since the firmware for CCITT and ANSI Level 2 are in the form of ROM separately in the conventional mobile communication exchange, it is necessary to know what the system configuration is when the system is mounted, so that the proper firmware can be applied and when the signal link is expanded during system operation, It is to solve the inconvenience that needs to be replaced by the additional ANSI or CCITT ROM.

3. Summary of Solution to Invention

A primitive setting step (ST1-ST13) of generating and setting a primitive so as to check whether a message type is CCITT or ANSI when transmitting and receiving a signal message at level 2 while initializing software and hardware; A primitive transmission process (ST14) for transmitting the set primitive to a level 3 data transmission unit; It is characterized in that it comprises a signal message processing step (ST15) of determining whether the signal message format is changed according to the primitive transmitted from the level 3 data transmission unit, and processes and transmits the signal message according to the determination result.

4. Important uses of the invention

It is essential to process common line signaling level 2 CCITT and ANSI standard signal messages by firmware in digital mobile communication exchange.

Description

Message Handling Method Using Level 2 Firmware in Mobile Switching System

The present invention provides two different parts of the signal message format between Level 2 of the International Telegraph and Telephone Consultative Committee (hereinafter referred to as CCITT) and the American National Standard Institute (hereinafter referred to as ANSI). It is intended to provide a message processing method using level 2 firmware in a mobile communication switch that improves productivity and reliability by modifying only primitives in communication between level 2 and level 3 without implementing with two firmwares. will be.

The present invention relates to a firmware implementation relating to the Level 2 standard of a message transfer part (MIT) of common line signaling devices in a digital mobile communication exchange.

The general mobile communication exchange implements NO.7 signal link level 2 firmware in CCITT and ANSI, respectively, and the part of the signal message format between CCITT and ANSI level 2 is somewhat different. Each has its own separate implementation of format conversion between ANSI and CCITT.

That is, conventionally, the CCITT Level 2 standard implements the firmware according to the standard, and the ANSI implements the firmware according to the ANSI level 2, and has produced and used ROMs separately. The signals of the ANSI and CCITT level 2 protocols have been used. Part of the slightly different message format has been format conversion in ANSI to CCITT communication.

Therefore, in the conventional mobile communication switch as described above, since the firmware for CCITT and ANSI Level 2 must be separately in the form of ROM, it is necessary to know the system configuration in advance when the system is mounted so that the correct firmware can be applied. There was an inconvenience in that the firmware ROM should be correctly mounted at the position of the signal terminal in charge of the function.

In addition, when the signal link is expanded during system operation, there is an inconvenience in that it is necessary to replace it with an additional ANSI or CCITT ROM, and it is inconvenient to change the signal link after deactivating the active signal link.

Accordingly, the present invention has been proposed to solve various problems that occur when transmitting and receiving messages between Level 2 and Level 3 of the conventional mobile communication switch, and an object of the present invention is that the signal message format between CCITT and ANSI level 2 is different. The message processing method using the level 2 firmware in a mobile communication switch that improves productivity and reliability by modifying only the primitives in the communication between level 2 and level 3 without implementing the two parts in the firmware is implemented as a single firmware. To provide.

In order to achieve the object of the present invention, a primitive setting process of generating and setting a primitive so as to determine whether a message type is CCITT or ANSI when transmitting and receiving a signal message at level 2 while initializing software and hardware. and; A primitive transmission process of transmitting the set primitive to a level 3 data transmission unit; A signal message processing process is performed to determine whether the signal message format is changed according to the primitive transmitted from the level 3 data transmitter, and process and transmit the signal message according to the determination result.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of the present invention will be described in detail.

1 is a schematic structural diagram of a message transmission unit in a mobile communication switch to which the present invention is applied;

2 is a flowchart illustrating a message processing method using level 2 firmware in a mobile communication switch according to the present invention;

Explanation of symbols for the main parts of the drawings

10: level 3 data transmission unit 20: level 2 data transmission unit

1 is a schematic block diagram of a message transmitter in a mobile communication switch to which the present invention is applied. When a primitive flag setting is requested from a level 3 data transmitter 10, a new primitive is generated by checking a type of a message to be transmitted. Whether the level 2 data transmitter 20 transmits the generated primitives to the level 3 data transmitter 10 before the signal link is activated, and the data format to be transmitted and received by the level 2 data transmitter 20 is CCITT. It consists of a Level 3 data transmitter 10 that requests primitive flag settings to determine whether it is ANSI, and changes the transmission and reception message format according to the primitive generated from the level 2 data transmitter 20.

FIG. 2 is a flowchart illustrating a message processing method using level 2 firmware in a mobile communication switch according to the present invention, in which software and hardware are initialized when power is supplied or reset (ST1) (ST2), and CCITT / ANSI setting. If required (ST3) checking whether the data format to be transmitted / received is ANSI standard (ST4), and if the data format to be transmitted / received is ANSI-compliant, a message signal unit (hereinafter abbreviated as MSU) or a retrieved MSU transmission / reception Checking whether it is ST5, if not transmitting or receiving the MSU or retrieved MSU (ST6), and if the MSU or retrieved MSU transmits and receives again, checking whether the MSU is transmitted or received (ST7) and Setting the MSU primitive to 156 if the MSU is transmitted and received (ST8); and setting the retrieved MSU primitive to 15F if the retrieved MSU is transmitted and received. (ST9), and if it is not ANSI standard in the step (ST4), it is determined that the CCITT standard and confirms whether the MSU or retrieved MSU transmission and reception (ST10) and if not MSU or retrieved MSU transmission and normal operation is performed, and If it is MSU or retrieved MSU transmission / reception, checking whether it is MSU transmission / reception again (ST11); if the MSU transmission / reception setting an MSU primitive to 56 (ST8); (ST13), transmitting the set primitives to level 3 (ST14), and checking the primitives transmitted at level 3 to process transmission / reception messages according to CCITT or ANSI standards (ST15).

The message processing method using the level 2 firmware according to the present invention as described above will be described in detail.

First, when power is supplied to the system or the system is reset, the level 2 data transmitter 20 initializes the software and hardware (ST1) (ST2), and between the level 2 and level 3 in the integrated level 2 firmware. When a flag requesting to indicate whether the CCITT standard or ANSI standard is transmitted from the level 3 data transmission unit 10 for transmitting and receiving a signal message (ST3), a flag requesting to indicate whether the data format to be transmitted or received is ANSI standard is displayed. When it is transmitted (ST3), it is checked whether the data format to be transmitted and received is ANSI standard (ST4).

Here, it is set to 0 when using the protocol of the CCITT standard to indicate whether to use the ANSI protocol or the CCITT protocol in the firmware of the signal terminal, and is defined as 1 when using the protocol of the ANSI standard.

On the other hand, the level 2 data transmission unit 20 searches for a data format to be transmitted and received and checks whether the message signal unit (MSU) or retrieved MSU is transmitted / received if it is ANSI standard (ST5), and if it is not the MSU or retrieved MSU transmit / received, it is normal. In operation ST6, the MSU primitive is set to 96 when the MSU is transmitted and received, and the retrieved MSU primitive is set to 9F when the MSU is transmitted and received (ST9).

In step ST4, if it is not an ANSI standard, it is determined as a CCITT standard and checks whether it is MSU or retrieved MSU transmission / reception (ST10), and if it is not MSU or retrieved MSU transmission / reception, performs normal operation (ST6), MSU or If the retrieval MSU transmission and reception again checks whether the MSU transmission and reception (ST11), if the MSU transmission and reception set the MSU primitive to 56 (ST8), otherwise, if the retrieved MSU transmission and reception MSU primitive set to 5F (ST13).

If a primitive is generated and set in this manner, the primitive set in the level 3 data transmitter 10 is transmitted before the signal link is activated (ST14), and thus the level 3 data transmitter 10 transmits the primitive. By identifying the used primitives, the protocol use of CCITT or ANSI standard is distinguished, and if the format of the signal message needs to be changed, it is changed to process the sending and receiving messages of ANSI and CCITT standard with one level 2 firmware (ST15). ).

As described above, the present invention implements a single firmware by modifying only the communication primitives between the level 2 and the level 3 without implementing parts of the signal message format between CCITT and ANSI level 2 with each level 2 firmware. As a result, productivity and reliability can be improved.

In addition, by handling the CCITT and ANSI standard signal messages with a single piece of software, it is possible to prevent the error caused by mounting the ANSI ROM when the CCITT standard is used or by detecting the CCITT ROM when the ANSI standard is used. There is also an effect.

In addition, since it is possible to process signal messages of the CCITT standard and the ANSI standard with one firmware ROM, configuration of the hardware may be easier than with each firmware ROM.

Claims (4)

Digital line communication system that transmits and receives the signal message of the common line signaling level 2 CCITT standard and ANSI standard, and whether the message type is CCITT or ANSI when transmitting and receiving the signal message in the level 2 data transmitter with the software and hardware initialized. A primitive setting process (ST-ST13) for generating and setting a primitive so as to check the; A primitive transmission process (ST14) for transmitting the set primitive to a level 3 data transmission unit; And a signal message processing process (ST15) for determining whether to change the signal message format according to the primitive transmitted from the level 3 data transmitter and processing and transmitting the signal message according to the determination result. Message handling method using level 2 firmware at exchange. The method of claim 1, wherein the primitive setting process (ST1-ST13) sets the message signal unit (MSU) primitive to 56 if the signal message is CCITT standard, and sets the retrieved MSU primitive to 5F, and MSU if the signal message is ANSI standard. A message processing method using Level 2 firmware in a mobile switching center, wherein the primitive is set to 156 and the retrieved MSU primitive is set to 15F. The method according to claim 1, wherein the primitive transmission transmits the primitive set in the level 3 data transmitter before the signal link is activated. The method according to claim 1, wherein the signal message processing is performed using a level 2 firmware in a mobile communication switch, wherein a part of a signal message format between CCITT and ANSI level 2 is somewhat different is processed by a unified firmware according to a primitive. .