KR100262822B1 - Method for preventing system down - Google Patents

Abstract

The present invention is to prevent the down of the system due to the setting of the wrong channel card parameters when switching the channel card of the central station multiplexer in the wireless call data satellite transmission system, the present invention is to control the channel card transfer acceptance message of the master PCCB base station control unit After determining the switching condition of the channel card after receiving from the mobile station, if the condition is met, the transfer acceptance message is transmitted to the demultiplexer to receive the channel status and the channel destination status of the demultiplexer, and the master PCCB determines the switching condition of the channel card. Sending the transfer acceptance message to the demultiplexer to receive the channel status and the channel destination status of the multiplexer, receiving the slot deletion of the database, and then performing channel access to report the channel card transfer completion to the network manager. Incorrect channel card parameter setting Problem interrupted by switching the channel card will be able to stabilize the satellite radio call data transmission systems.

Description

System down prevention method when channel card switching of radio calling data satellite transmission system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a paging satellite communication system, in particular due to a wrong channel card parameter setting when switching a channel card (QSP, Quadrature Synchronous Processor) of a central station multiplexer in a paging satellite system. The present invention relates to a system down prevention method when switching a channel card of a radio call data satellite transmission system to prevent a system down.

In general, a radio call data satellite transmission system is a system for transmitting radio call data through a satellite, and is a one-way data transmission system in which a path between base stations is replaced by a link using a satellite in a conventional leased line in a TDX-PS.

1 is a block diagram of a general radio call data satellite transmission system.

As shown therein, the central station 10 receives the radio call signal and modulates the radio call signal to the satellite; The base station 10 is composed of a plurality of base stations 30 for receiving and restoring radio call signals transmitted from satellites.

In the above, the central station 10 of the radio call data satellite transmission system includes a Paging Central Interface Block (PCIB) 11 for converting an analog paging signal to digital by a frequency shift keying (FSK) of the exchange. )Wow; A channel card (QSP, Quadrature Synchronous Processor) 13 for synchronizing the clocks of the channel input / output data of the subscriber matching unit 11 and compensating for the deviation between the system clock and the reception clock; A multiplexer 12 connected to multiplex signals of a digitally switched exchange having an interlink (ILC) 14 to process data between a channel and an intermachine link; A modulator (15) for modulating the baseband signal input from the multiplexer (12) to output a signal of an intermediate frequency band; A radio frequency transmitter (RF) 16 for transmitting an intermediate frequency band signal input from the modulator 15 to a satellite as a high frequency signal; A network control unit (NCL) connected to the multiplexer 12 to perform control of the multiplexer 12; It is connected to the subscriber matching section 11, the modulating section 15, the high frequency transmitting section 16 and the network control section 17, and is responsible for the respective control, and periodically polling the state of each device Local PCCB (18) to transmit to the master PCCB 19, the control information transmitted from the Network Management System (NMS, Network 20) to each device of the central station 10 (Paging Central Control Block) (18) Wow; It is connected to the local PCCB 18 and collects the state information of the terminal station collected by the base station control unit 38 of the base station 30 as well as each device of the central station 10 to transmit to the network management unit 20. A master PCCB 19; A center PCCB (20) connected to the master PCCB (19) for performing communication between the central station (10) and the base station (30); A modem 21 for transmitting / receiving data to / from a base station connected by a dedicated line according to a communication execution command of the center PCCB 20; Connected to the master PCCB 19, it is composed of a network management unit 22 for managing the configuration and status of the entire radio call data satellite transmission system.

In addition, the base station 30 of the radio call data satellite transmission system, the high-frequency receiver 31 for low-noise amplifying the signal received from the satellite and converts it into an intermediate frequency signal; A demodulator (32) for restoring a signal output from the high frequency receiver (31) to an original signal; An interlink 34 connected to the demodulator 32 to demultiplex data from a signal demodulated by the demodulator 32, and a link between the interlink 34 to compensate for a deviation between a system clock and a reception clock; A demultiplexer 33 having a channel card 35 for demultiplexing a signal transmitted from a satellite into a digital signal; A Paging Remote Interface Block (PRIB) 36 for restoring digital data of the demultiplexer 33 to an FSK analog paging signal; A network controller 37 connected to the demultiplexer 33 to control the demultiplexer 33; The demodulator 32, the demultiplexer 33, and the subscriber subscriber matching unit 36 periodically collect states and transmit them to the center PCCB unit 20 through the modem 21 of the central station 10. And a base station controller (PRCB, Paging Remote Control Block) 38 that controls the devices of the base station 30 according to the command of the network manager 22.

The operation of the general radio call data satellite transmission system configured as described above is as follows.

First, the central station 10 of the radio call data satellite transmission system converts an FSK analog paging signal transmitted from a TDX (Time Division Multiplexing) -PS exchange, which is a paging data exchanger, into a digital signal in the subscriber matching unit 11 and multiplexes the multiplexer 12. To be entered. Then, the multiplexer 12 synchronizes the clocks of the channel input / output data in the channel card 13, compensates for the deviation between the system clock and the reception clock, and then, in the interlink 14, between the channel module and the intermachine link. Will process the data. By encoding and modulating with binary phase shift keying (BPSK), an intermediate frequency (IF) signal having a bandwidth of 250 KHz / 500 KHz is transmitted to the high frequency transmitter 16.

Then, the high frequency transmitter 16 inputs the output signal of the modulator 15 to the attenuator to be adjusted by the uplink power control (UPC) and the beacon receiver, and performs the redundancy control to be transmitted to the outdoors. The signal transmitted to the outdoors is distributed by the outdoor power divider and transmitted to the transmitter. Then, the transmitter is amplified to a predetermined uplink frequency and power level, and the signal of the outdoor transmitter selected by the waveguide switch is connected to the feeding part of the antenna by the object modeling technique (OMT) to emit radio waves to the satellite.

Accordingly, the plurality of base stations 30 of the radio call data satellite transmission system low-amplify a small signal of 12.25 ~ 12.75GHz received from the satellite in the high frequency receiver 31 and then converts it into an IF signal of 950 ~ 1450MHz. The demodulator 33 restores the original data by BPSK demodulation, descrambling, discrete decoding, and R = 1/2 k = 7 Viterbi decoding. .

The restored data is demultiplexed in the interlink 34 of the demultiplexer 33 and transferred to the channel card 35. Then, the subscriber register matching unit 36 restores the digital data of the channel card 35 to the FSK analog paging signal and transmits the radio pager through the transmitter so that the user's radio pager can receive the radio call signal.

Meanwhile, the monitoring and control operations of the central station 10 and the base station 30 are performed through the PCCBs 18, 19, and 20. That is, the local PCCB 18 periodically polls all the devices of the central station 10 to store the status as a message, and then reports the status message when the master PCCB 19 polls, and issues the commands of the network manager 22. Distribute to the device. In addition, the master PCCB 19 polls the local PCCB 18 and the center PCCB 20 to report the state of the central station 10 and the base station 30 apparatuses to the network management unit 22, and commands from the network management unit 22. To the local PCCB 22 and the center PCCB 22. The center PCCB 20 is then responsible for the communication between the central station 10 and the base station 30. When the master PCCB 19 polls the center PCCB 20, the subscriber connection 38 of the base station 30 is connected. The collected base station status message is reported to the master PCCB 19.

And the network management unit 22 manages the configuration and state of the entire radio call data satellite transmission system, the central station multiplexer 12 component adjustment, the output frequency adjustment of the modulation unit 15, the high frequency transmission unit 16 transmission Control the base station 10 by controlling the output, adjusting the antenna orientation angle, and controlling the base station 30 by controlling the components of the demultiplexer 33 and adjusting the reception channel frequency of the demodulator 32. Graphical User Interface (GUI) has been provided to the user.

The conventional channel card switching control method in the wireless call data satellite transmission system configured and operated as follows is as follows.

2 is a flowchart illustrating a conventional channel card switching control method.

As shown in the figure, the base station controller 38 receives the T-pattern alarm report of the subscriber subscriber matching unit 36, requests the state of the demodulator 32 to receive a response, and alarms the demultiplexer 33. Receiving a response by transmitting a status display command and transmitting a channel card transfer request command to the master PCCB (ST1-ST6); The master PCCB 19 receives the channel card switching request of the base station controller 38, receives the system state and the connection state of the multiplexer 12, reports the channel card switching start to the network manager 22, and Transmitting a channel card transfer acceptance message to the base station controller 38 (ST7-ST12); Receiving, by the base station controller 38, a channel card transfer acceptance message of the master PCCB 19, and receiving a channel state and a channel destination state of the demultiplexer 33 (ST13-ST16); The master PCCB 19 receives the channel state and the channel destination state of the multiplexer 12, receives the slot deletion of the database, and then performs a channel access to report the channel card transfer completion to the network manager 22. Steps (ST17-ST25) were performed.

In the channel card switching routine of the base station controller 38, as shown in FIG. 3, the T-pattern generated by the subscriber register matching unit 36 is detected, and whether the state of the demodulator 32 is abnormal. Determining steps ST31 and ST32; Determining whether the hardware of the demultiplexer 33 has an error if the state of the demodulator 32 is not abnormal (ST33); Determining whether there is an error in the link service of the demultiplexer (33) if there is no error in the hardware of the demultiplexer (33); If there is no abnormality in the link service of the demultiplexer 33, the channel card transfer request is transmitted to the master PCCB 19, and the master PCCB 19 determines whether the channel card transfer request is accepted (ST35). (ST36); Executing another routine if the master PCCB 19 does not accept the channel card transfer request (ST37); Changing the display state when the master PCCB 19 receives the channel card transfer request (ST38); If the state of the demodulator 32 is abnormal or there is an error in the hardware of the demultiplexer 33 or there is an error in the link service of the demultiplexer 33, reporting and returning it to the network manager 22 (ST39) was performed.

In the channel card switching routine of the master PCCB 19, as shown in Fig. 4, the base station controller 38 determines whether there is a channel card switching request (ST41) (ST42); Executing another routine when there is no channel card transfer request (ST43); Checking if there is a channel card transfer request (ST44); Checking the presence of the database and then checking the channel access and hardware presence (ST45); Checking the channel access and the presence of hardware and then reporting the start of channel card switching to the network management unit 22 and transmitting a channel card transfer acceptance message to the base station controller 38 (ST46); Transmitting a channel card transfer acceptance message to the base station controller 38, and then copying a database and changing a channel destination (ST48); After copying the database and changing the channel destination, the channel of the active channel was deleted and the channel card was reported to the network management unit 22 by performing channel access (ST49-ST51).

In the above database existence check routine (ST44), as shown in Fig. 5, the step of determining whether the slot is an odd slot of hardware or a database (ST61); Determining whether the slot is an even slot of hardware or a database if the slot is an odd slot of hardware or a database (ST62); Determining whether the slot is an odd slot or an even number database if the slot is an even number of hardware or a database (ST63); Returning the slot if it is a database of odd or even slots; If the slot is not an odd slot or an even slot of hardware or a database, the network management unit 22 notifies the channel card transfer impossible (ST65).

In the channel access and hardware presence check routine (ST45) above, as shown in Fig. 6, if the odd slots are connected and the hardware of the even slots remains (ST71) (ST72); Returning if the even slot is connected and the hardware of the odd slot remains (ST73) (ST74); If the odd slots and the even slots are not connected or the odd slots hardware is not left in the state where the odd slots are connected, or the odd slots hardware is left in the state where the even slots are connected, the channel card to the network management unit 22 A step (ST75) of notifying transfers was performed.

In the above database copy and channel destination change routine (ST48), as shown in Fig. 7, if the first to fourth channel card database of the active slot is valid, the database of the standby slot is copied from the active slot to standby the channel card. Switching to and returning from the first to fourth channel cards of the slot (ST81-ST88); If the first to fourth channel card database of the active slot is not valid, the step of reporting channel card transfer impossible to the network manager 22 is performed (ST89).

Therefore, in the radio call data satellite transmission system, the multiplexing unit 12 of the central station 10 is implemented with redundancy. In this case, each device is configured to perform automatic switching to a standby card in the event of hardware failure of an active card. It is. Here, since the channel card 13, which is an input / output card of the central station multiplexer 12, does not support redundancy by itself, the channel card 13 redundancy and transfer process are performed by the PCCBs 18, 19, 20 and the base station. The control part 38 processes it by software.

As shown in the channel card switching process of FIG. 2, in the related art, the T-Pattern Alarm generated by the base station controller 38 in the subscriber register matching unit 36 when the channel card hardware error of the central station multiplexer 12 occurs. Channel card switching is performed by sending a channel card transfer request command to the master PCCB (19).

Thus, if a hardware error occurs in the active channel card of the central station multiplexer 12, the radio call service of the channel is stopped, and the T-pattern alarm is generated in the base station controller 38 of the base station. The base station controller 38 detects the T-pattern alarm, determines the channel card switching condition, and when the channel card condition is satisfied, transmits a channel card switching request command to the master PCCB 19. From this time, the master PCCB 19 starts channel card switching.

However, when the channel card is switched in the conventional manner, the following problems are caused.

First, when the master PCCB 19 has a database ID in the active slot and a hardware ID in the standby slot, if a channel of the active slot is connected, the master PCCB 19 sends a channel card transfer acceptance command to the base station controller 38. Send and start the transfer in earnest. However, here, the master PCCB 19 checks another channel card switching condition. Here, a problem occurs.

That is, the master PCCB 19 checks whether all four channels of the active channel have a database through the "DSP CH" command, and if any one of the four channels does not have a database, it immediately stops channel card switching. Exit the routine. This result also occurs in the base station controller 38 as well.

In this case, you will not be able to execute the following "DEL SL" and "CON CH" commands, so that both the active and standby slots will have a database, and in the worst case, the channel destination for one slot will be different. This can lead to unexpected results. As a result, all four channels corresponding to one slot are disconnected, which causes a problem that the wireless call service corresponding to this channel is interrupted.

Accordingly, the present invention has been proposed to solve the above-mentioned conventional problems, and an object of the present invention is to download a system due to an incorrect channel card parameter setting when a channel card is switched in a multiplexer of a central station multiplexing system in a radio calling data satellite transmission system. It is to provide a system down prevention method when the channel card of the radio call data satellite transmission system that can prevent the changeover.

In order to achieve the above object, the system call prevention method when switching the channel card of the radio call data satellite transmission system according to the present invention,

Receiving a T-pattern alarm report of the subscriber subscriber matching unit from the base station controller, receiving a response of the demodulator and the demultiplexer, and transmitting a channel card transfer request to the master PCCB; Receiving the channel card transfer request of the base station controller from the master PCCB, receiving a system state and a connection state of the multiplexer, reporting the start of channel card transfer to the network manager, and transmitting a channel card transfer acceptance message to the base station controller; After receiving the channel card transfer acceptance message of the master PCCB from the base station controller, determine the transfer condition of the channel card, and if the condition is met, transfer the transfer acceptance message to the demultiplexer to receive the channel state and the channel destination state of the demultiplexer. Steps; After determining the transfer condition of the channel card in the master PCCB, if the condition is met, the transfer acceptance message is transmitted to the multiplexer to receive the channel state and the channel destination state of the multiplexer, receive the slot deletion of the database, and then perform channel access. Characterized in the technical configuration of performing the step of reporting the channel card transfer completion to the network management unit.

1 is a block diagram of a general wireless data satellite transmission system;

2 is a flowchart illustrating a conventional channel card switching control method;

3 is a flowchart illustrating a channel card switching routine of the base station controller in FIG. 2;

4 is a flowchart showing a channel card switching routine of the master PCCB in FIG.

5 is a flowchart showing a database existence check routine in FIG. 4;

6 is a flowchart showing a channel access and hardware presence check routine in FIG.

7 is a flowchart illustrating a database copy and channel destination change routine in FIG. 4;

8 is a flowchart illustrating a system down prevention method when a channel card is switched in a radio call data satellite transmission system according to the present invention;

9 is a flowchart illustrating a channel card switching routine of the base station controller in FIG. 8;

FIG. 10 is a flowchart showing a database copy and channel destination change routine in FIG. 9;

11 is a flowchart showing a channel card switching routine of the master PCCB in FIG. 8;

FIG. 12 is a flowchart showing a database copy and channel destination change routine in FIG. 11. FIG.

<Explanation of symbols for main parts of drawing>

10: central station 11: subscriber matching department

12: multiplexer 13, 35: channel card

14, 34: interlink 15: modulator

16: high frequency transmitter 17, 37: network controller

18: Local PCCB 19: Master PCCB

20: Center PCCB 21: Modem

22: network management unit 30: base station

31: high frequency transmission unit 32: demodulation unit

33: demultiplexer 36: reverse subscriber matching unit

38: base station controller

Hereinafter, with reference to the accompanying drawings, an embodiment according to the technical concept of the system down prevention method when switching the channel card of the present invention, the radio call data satellite transmission system as described above in detail.

8 is a flowchart illustrating a system down prevention method when a channel card is switched in a radio call data satellite transmission system according to the present invention.

As shown therein, the base station controller 38 receives the T-pattern alarm report of the subscriber subscriber matching unit 36, receives the status of the demodulator 32 and the demultiplexer 33, and then responds to the master PCCB 19. Transmitting the channel card transfer request (ST101 to ST106); After receiving the channel card switching request of the base station controller 38 from the master PCCB 19, receiving the system state and the connection state of the multiplexer 12, and receiving the alarm state of the multiplexer 12, the network manager Reporting the start of channel card switching to 22 and transmitting a channel card switching acceptance message to the base station controller 38 (ST107-ST112); After receiving the channel card transfer acceptance message of the master PCCB 19 from the base station controller 38 and determining the transfer condition of the channel card, if the condition is met, the transfer acceptance message is sent to the demultiplexer 33 to demultiplex the receiver. Receiving the channel state and channel destination state of the unit 33 (ST113-ST116); After determining the switching condition of the channel card in the master PCCB (19), if the condition is met, the transfer acceptance message is transmitted to the multiplexer (12) to receive the channel status and channel destination status of the multiplexer (12), After receiving the slot deletion response, the channel access is performed to report the completion of the channel card transfer to the network manager 22 (ST117 to ST125).

The channel card switching steps ST101 to ST106 (ST113 to ST116) in the base station controller 38 detect the T-pattern generated in the subscriber register matching unit 36 as shown in FIG. Checking whether the state of the demodulator 32 is abnormal, a hardware error of the demultiplexer 33, an abnormality of the link of the demultiplexer 33, a change of the channel card database, and whether the channel is disconnected ( ST131-ST136); Checking the unconnected state of the channel and transmitting a channel card transfer request to the master PCCB (19), and determining whether the master PCCB (19) accepts the channel card transfer request (ST137-ST139); When the master PCCB 19 accepts the channel card transfer request, the transfer acceptance message is transmitted to the demultiplexer 33 to perform a database copy and channel destination change of the demultiplexer 33 to change an alarm state and a connected state. Changing the display of the display (ST140) is performed.

In the database copying and channel destination changing step 140, the first channel card database of the active slot is checked as shown in FIG. 10, and if it is valid, the database of the standby slot is copied from the active slot to standby the channel card. Switching to the first channel card of the slot (ST151) (ST152); If the transfer of the first channel card is performed or if the first channel card database of the active slot is invalid, the second channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to the second channel card of the slot (ST153) (ST154); If the transfer of the second channel card is performed or the second channel card database of the active slot is not valid, the third channel card database of the active slot is checked and if it is valid, the standby of the channel card is copied by copying the standby slot database from the active slot. Switching to the third channel card of the slot (ST155); If the third channel card is switched or the third channel card database of the active slot is not valid, the fourth channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to a fourth channel card of the slot (ST157) (ST158); If the fourth channel card database of the active slot is not valid, the network management unit 22 notifies the channel card switchover possibility (ST159).

In the channel PC switching step (ST107-ST110) (ST117-ST125) in the master PCCB 19, as shown in Fig. 11, the base station controller 38 is polled to determine whether there is a channel card switching request. Step ST161 and step ST162; Executing another routine when there is no channel card transfer request (ST163); Checking the existence of a database of the multiplexer 12 if the channel card transfer request is required (ST164); Checking the existence of the database and then checking the channel access and hardware presence of the multiplexer 12 (ST165); Checking the channel connection and the presence of hardware and then checking the database change of the multiplexer 12 (ST166); Checking the database change and then reporting the start of channel card switching to the network manager 22 and transmitting a channel card switchover acceptance message to the base station controller 38 (ST167); Transmitting a transfer acceptance message to the multiplexer 12 when the base station controller 38 receives the channel card transfer request (ST169); After changing the database copy and the channel destination, delete the database of the active slot and perform a channel access to report the completion of channel card transfer to the network management unit 22 (ST170-ST172).

In the above step of copying the database and changing the channel destination 169, as shown in FIG. 12, if the first channel card database of the active slot is checked and valid, the database of the standby slot is copied from the active slot to standby the channel card. Switching to the first channel card of the slot (ST181) (ST182); If the transfer of the first channel card is performed or if the first channel card database of the active slot is invalid, the second channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to the second channel card of the slot (ST183) (ST184); If the transfer of the second channel card is performed or the second channel card database of the active slot is not valid, the third channel card database of the active slot is checked and if it is valid, the standby of the channel card is copied by copying the standby slot database from the active slot. Switching to the third channel card of the slot (ST185) (ST186); If the third channel card is switched or the third channel card database of the active slot is not valid, the fourth channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to the fourth channel card of the slot (ST187) (ST188); If the fourth channel card database of the active slot is not valid, the network management unit 22 notifies of the channel card transfer impossible (ST189).

Referring to the accompanying drawings, the operation of the channel card switching control method of the radio call data satellite transmission system according to the present invention configured as described above will be described in detail as follows.

First, when the channel card hardware error of the central station multiplexing unit 12, the base station controller 38 detects the T-pattern alarm transmitted from the subscriber subscriber matching unit 36 to perform the switching of the channel card. At this time, the channel card switching condition is as follows.

1) Switching condition of base station channel card 35

-T-pattern alarm at the subscriber register 36

Normal state of the demodulator 32

If there is no hardware error or service link out of the demultiplexer 33

2) Transfer condition of the central station channel card 13

-Channel Card (13) Transfer Enable

-Number of base stations that requested channel card switching above the threshold

-A database must exist in all four channels of the active card of the central station channel card 13, and hardware must exist in the standby card.

At least one channel of the active cards of the central station channel card 13 must be connected.

Thus, if a hardware error occurs in the active channel card of the central station multiplexer 12, the radio call service of the channel is stopped, and the T-pattern alarm is generated in the base station controller 38 of the base station. The base station controller 38 detects the T-pattern alarm, determines the channel card switching condition, and when the channel card condition is satisfied, transmits a channel card switching request command to the master PCCB 19. From this time, the master PCCB 19 starts channel card switching.

Looking at the channel card transfer process in more detail as follows.

First, the base station controller 38 detects the T-pattern alarm generated by the subscriber subscriber matching unit 36 (ST101), checks whether the demodulator 32 is normal (ST102) (ST103), and demultiplexer ( 33, a " DSP AQ (Display Alarm Queue) " signal displaying the alarm status is checked to determine whether a hardware error (Alarm 2) has occurred in the demultiplexer 33 (ST104) (ST105).

If the demodulator 32 and the demultiplexer 33 are in a normal state, the base station controller 38 transmits the channel card switching request to the master PCCB 19 via the center PCCB 20 (ST 106).

The master PCCB 19 receiving the channel card switching request first checks whether the channel card switching is enabled in the multiplexer 12, and checks whether the number of channel card switching request base stations for the corresponding channel is greater than or equal to the threshold value.

Thus, if the channel card of the multiplexer 12 is switched enabled and the number of channel card transfer request base stations is greater than or equal to the threshold value, the master PCCB 19 transmits a "DSP ST Display State System" command to display the system status. To determine the database and hardware implementation of the channel card (ST107) (ST108).

If the database and hardware implementation of the channel card meet the channel card switching condition, the "DSP CON" command for displaying the connection status is transmitted to the multiplexer 12 again, and a response is received to determine whether the channel is connected (ST107-ST110). ).

Accordingly, when all channel card switching conditions are satisfied, the master PCCB 19 reports the start of channel card switching to the network management unit 22 (ST111), and issues a channel card transfer acceptance command to the base station controller 38 (ST112). ) Channel card transfer begins.

On the other hand, when the base station controller 38 receives the slot number to be transferred together with the channel card transfer acceptance command from the master PCCB 19, the " DSP CH " command and the channel destination for displaying the channel to the demultiplexer 33. The channel destination for the corresponding slot is changed by sending a "DEF CH (Definition Channel" command) specifying the address (ST113-ST116).

In addition, the master PCCB 19 transmits a "DSP CH" command and a "DEF CH" command to the multiplexer 12 to copy the database of the active card to the standby, change the channel destination (ST117-ST120), and then again. The multiplexer 12 transmits a "DEL SL (Delete Slot)" command to delete the slot in the database (ST121) (ST122).

Then, the master PCCB 19 transmits the "CON CH" command for connecting the channel to the multiplexer 12 to terminate the switching of the channel card (ST123) (ST124).

Finally, the channel card transfer completion command is reported to the network management unit 22 and the channel card transfer execution is terminated (ST125).

Here, when the master PCCB 19 has a database ID in the active slot and a hardware ID in the standby slot, if any channel of the active slot is connected, the master PCCB 19 sends a channel card transfer acceptance command to the base station controller 38 in earnest. Start the transfer. However, here, the master PCCB 19 checks another channel card switching condition. Here, a problem occurs. That is, the master PCCB 19 checks whether all four channels of the active channel have a database through the "DSP CH" command, and if any one of the four channels does not have a database, it immediately stops channel card switching. Exit the routine. This result is also applied to the base station controller 38.

If this happens, you will not be able to execute the following "DEL SL" and "CON CH" commands, so that both active and standby slots will have a database, and in the worst case, the channel destination for one slot will be different. Will result. As a result, all four channels corresponding to one slot are disconnected, resulting in the interruption of the radio call service corresponding to this channel.

These problems can be solved by modifying the channel card switching procedure of the master PCCB 19 and the base station controller 38. In fact, the channel card switching requirement that there must be four databases of active slots is not very necessary.

Therefore, when the master PCCB 19 receives the channel card transfer request from the base station controller 38, the master PCCB 19 determines the channel card transfer condition, and if the condition is met, transmits the channel card transfer acceptance signal to the base station controller 38 again, and then the active slot. The existence of the database is checked through the "DSP CH" command from the first channel of the. At this time, the network manager 17 card of the multiplexer 12 receiving the "DSP CH" command transmits a response to the command to the master PCCB 19, and the master PCCB 19 measures the length of the response. Check for the existence of a database.

Therefore, if the database exists, execute the next routine "DEF CH" command to copy the database to the standby slot. If the database does not exist, run the "DSP CH" command of the next channel to check the database. do.

This causes both active and standby slots to have a database, worst-case channel destinations for one slot, and all four channels being disconnected due to inability to issue a channel connect command. To solve them.

As described above, the present invention prevents the system from being down due to an incorrect channel card parameter setting when switching the channel card of the central station multiplexer in the radio call data satellite transmission system.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. That is, in the general satellite communication field, it can be applied to the redundancy implementation and automatic switching method of the multiplexing equipment in which the card duplication is not provided in hardware.

Therefore, it is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Accordingly, the above description does not limit the scope of the invention as defined by the limitations of the following claims.

As described above, the system down prevention method of channel card switching in the radio call data satellite transmission system according to the present invention is the wrong channel card parameterization of the multiplexer / demultiplexer when the channel card is transferred from the central station multiplexer in the radio call data satellite transmission system. It is possible to stabilize the radio calling data satellite transmission system by solving the problem of interruption of channel card switching due to variable setting.

Claims (5)

Receiving a T-pattern alarm report of the subscriber subscriber matching unit from the base station controller, receiving a response of the demodulator and the demultiplexer, and transmitting a channel card transfer request to the master PCCB; Receiving the channel card transfer request of the base station controller from the master PCCB, receiving a system state and a connection state of the multiplexer, reporting the start of channel card transfer to the network manager, and transmitting a channel card transfer acceptance message to the base station controller; After receiving the channel card transfer acceptance message of the master PCCB from the base station controller, determine the transfer condition of the channel card, and if the condition is met, transfer the transfer acceptance message to the demultiplexer to receive the channel state and the channel destination state of the demultiplexer. Steps; After determining the switching condition of the channel card in the master PCCB, if the condition is met, the transfer acceptance message is transmitted to the demultiplexer to receive the channel status and the channel destination status of the multiplexer, receive the slot deletion of the database, and then perform channel access. And reporting the channel card transfer completion to the network management unit. The channel card switching step of the base station controller, Detects the T-pattern generated in the subscriber register and checks whether the demodulator state is abnormal, whether the hardware of the demultiplexer is defective, whether the demultiplexer link is abnormal, whether the channel card database is changed, and whether the channel is disconnected. Checking; Checking a non-connection state of the channel and transmitting a channel card transfer request to the master PCCB and determining whether the master PCCB has accepted a channel card transfer request; When the master PCCB accepts the channel card transfer request, transmitting the transfer acceptance message to the demultiplexer to perform a database copy and channel destination change of the demultiplexer to change the display of the alarm state and the connection state. System down prevention method when channel card switching of radio calling data satellite transmission system. The method of claim 2, wherein the copying of the database and the channel destination change are performed. Checking the first channel card database of the active slot and, if valid, copying the database of the standby slot from the active slot to transfer the channel card to the first channel card of the standby slot; If the transfer of the first channel card is performed or if the first channel card database of the active slot is invalid, the second channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to a second channel card in the slot; If the transfer of the second channel card is performed or the second channel card database of the active slot is not valid, the third channel card database of the active slot is checked and if it is valid, the standby of the channel card is copied by copying the standby slot database from the active slot. Switching to a third channel card of a slot; If the third channel card is switched or the third channel card database of the active slot is not valid, the fourth channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to a fourth channel card of a slot; And if the fourth channel card database of the active slot is not valid, notifying the network management unit of the possibility of channel card changeover. The method of claim 1, wherein the channel card switching in the master PCCB, Determining whether there is a channel card switching request by polling the base station controller; Executing another routine when the channel card transfer request is not made; Checking the existence of a database of the multiplexer if the channel card transfer request is made; Checking the presence of the database and then checking the channel access and hardware presence of the multiplexer; Checking the channel connection and the presence of hardware and then checking the database change of the multiplexer; Checking the change of the database and reporting the start of channel card switching to the network manager and transmitting a channel card transfer acceptance message to the base station controller; Transmitting a transfer acceptance message to the multiplexer to change a database copy and a channel destination when the base station controller receives a channel card transfer request; Changing the database destination and changing the channel destination, and deleting the database of the active slot and performing channel access to report the completion of the channel card transfer to the network management unit. To prevent system downtime. The method of claim 4, wherein the copying of the database and the channel destination change are performed. Checking the first channel card database of the active slot and, if valid, copying the database of the standby slot from the active slot to transfer the channel card to the first channel card of the standby slot; If the transfer of the first channel card is performed or if the first channel card database of the active slot is invalid, the second channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to a second channel card in the slot; If the transfer of the second channel card is performed or the second channel card database of the active slot is not valid, the third channel card database of the active slot is checked and if it is valid, the standby of the channel card is copied by copying the standby slot database from the active slot. Switching to a third channel card of a slot; If the third channel card is switched or the third channel card database of the active slot is not valid, the fourth channel card database of the active slot is checked and if it is valid, the standby card is copied from the active slot to standby the channel card. Switching to a fourth channel card of a slot; And if the fourth channel card database of the active slot is not valid, notifying the network management unit of the possibility of channel card changeover.