KR100313756B1 - Dual apparatus of base station control card of communication system and method thereof - Google Patents

Abstract

According to the present invention, when a node failure of a BIN block and a failure of an active BCPA fail, an interrupt is generated to the standby side BCPA so that the standby BCPA operates actively, thereby preventing call disconnection of the entire base station and enabling continuous system operation. The present invention relates to a redundancy apparatus and method for a redundancy scheme. In a redundant operation with BCPA as a hot standby, a node failure of a BIN block connected to an active BCPA and a failure to receive HDLC communication clock from a BIN block for a certain period of time may cause the BCPA to fail. If you consider yourself making a reset, or if your BCPA doesn't break out of software in an endless loop, you can control the watchdog clock to make your own reset, or if the CPU goes down without you knowing, go to standby BCPA. Generate an interrupt to allow standby BCPA to be active By using the interrupt method instead of the polling method, the CPU performance is not degraded, and the function of monitoring the node failure of the BIN block during the operation of the base station is provided. If it does not come out, it resets itself and makes an accurate transfer to the other party, thereby improving the reliability and quality of service of the entire base station system, such that the service personnel can prevent the disconnection of the call service without having to go to the site to repair the system for normalization. It has the effect of being able to.

Description

Dual apparatus and base station control card of communication system and method of communication system

The present invention is a communication using a code division multiple access (CDMA) scheme such as a digital cellular system (hereinafter referred to as 'DCS') or a personal communication system (hereinafter referred to as 'PCS'). In a redundant implementation of a BTS Control Processor Assembly (BCTS), which is mounted at a base station of a system, Node Fail and Active Side BCPA failure of a BTS Interconnection Network (BIN) block Redundant device of BCPA of communication system which interrupted call standby by BCPA at standby side and prevented call service disconnection of entire base station and continued system operation It is about a method.

In general, BCPAs mounted in base stations of communication systems such as DCS or PCS are dually configured as active boards and standby boards, and conventionally, redundancy was operated by periodically polling the state of CPUs in the other BCPAs. .

However, as the polling technique is used as described above, the performance of the CPU is degraded due to the load on the CPU. In particular, when the node of the BIN block managed by BCPA fails during operation of the base station, BCPA is changed. There is a problem that the call service disconnection of the entire base station occurs because there is no function.

In addition, if the CPU in BCPA is unable to break out of the software in an endless loop, there is no way to reset itself, so a repair agent can go to the scene and perform a hardware reset or repair. Only when the base station can be made normal operation, during which time the base station becomes impossible to operate.

As a result, the reliability of the base station system and the quality of service have resulted.

The present invention has been made to solve the above problems, the object of which is to implement a BCPA redundancy implemented in a base station of a communication system applying a CDMA scheme such as DCS or PCS, node failure of the BIN block during base station operation and If the failure of the active BCPA causes the call service disconnection of the entire base station, an interrupt is generated to the standby BCPA so that the standby BCPA is active, preventing the disconnection of the call service of the entire base station and enabling continuous system operation. The present invention provides a redundant apparatus and method for BCPA.

1 is a view showing a connection relationship between a base station control card and a BIN block of the communication system according to the present invention and an interconnection relationship when the base station control card is redundantly operated;

2 is a block diagram of a duplication apparatus of a base station control card of a communication system according to the present invention;

Figure 3 is a flow chart showing the operation of the duplexing device of the base station control card of the communication system according to the present invention.

<Description of the symbols for the main parts of the drawings>

10: BIN block 20-1: A side BCPA

20-2: B side BCPA21: CPU

22: watchdog clock generation register

23: watchdog clock control register

24: 2: 1 mux

25: watchdog clock monitoring unit

26: clock and alarm monitoring time control

27: reception clock monitoring unit

28: reception alarm monitor

BCPA redundancy apparatus and method of the communication system of the present invention to achieve this object, HDLC from the node failure and BIN block of the BIN block connected BCPA on the active side during BCPA redundancy operation in hot standby (Band Stand By) If the communication clock has not been received for a certain period of time, consider your BCPA as a failure and make a reset yourself, or if your BCPA is unable to break out of software in an endless loop, control the watch dog clock to When the CPU is down in a state where a reset is made or unknown, it generates an interrupt to the standby BCPA so that the standby BCPA is active.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation of the redundant apparatus of the BCPA of the communication system according to the present invention.

1 is a diagram illustrating a connection relationship between a BCPA and a BIN block in a base station and an interconnection relationship in a redundant operation of BCPA according to the present invention, wherein the A side BCPA 20-1 and B side BCPA ( 20-2 is connected to the different nodes 10-1, 10-N-1 of the BIN block 10, respectively, to communicate with the BIN block 10, where A side BCPA 20-1 and B side Between the BCPA 20-2 and the BIN block 10, the HDLC communication clocks (Tx CLK, Rx CLK), data (Tx DATA, Rx DATA), and an alarm signal for informing when a failure occurs ( Tx ALM, Rx ALM).

The A-side BCPA 20-1 and the B-side BCPA 20-2 are configured as an active side when the other side failure interrupt which informs each other of the failure state and the standby side BCPA are switched to the active side due to the other side failure interrupt. In order to perform the operation normally, the other side is connected to each other through a counterpart DPRAM access path, which is a path for copying all information in the base station of the active BCPA, and an auxiliary communication path, SCC.

Fig. 2 is a block diagram of a BCPA duplication apparatus of a communication system according to the present invention, wherein the CPU 21 controls the operation of each component block during BCPA duplication operation, and the watch according to the control signal of the CPU 21. Watch dog clock generation register 22 for generating a dock clock and the CPU clock before the CPU 21 is initialized according to the control signal of the CPU 21, and the watch dog after the CPU 21 is initialized. A watchdog clock control register 23 for outputting a selection control signal for selecting a watchdog clock generated by the clock generation register 22 as a watchdog clock, and a control signal of the watchdog clock control register 23; A 2: 1 mux 24 for selecting a watchdog clock generated by the CPU clock or the watchdog clock generation register 22 and a watchdog clock selected and outputted from the 2: 1 mux24 If there is no change for a certain time A watchdog clock monitoring unit 25 for performing hardware reset to the CPU 21, and a clock and alarm monitoring time control unit that monitors time by generating an enable signal when the CPU clock is counted and exceeds a predetermined number ( 26) and whether the received clock for HDLC communication has not been received from the BIN block for a predetermined period of time according to the enable signal of the clock and alarm monitoring time control section 26, so that the received clock is high or low. Is maintained for a predetermined time, an alarm indicating a node failure from a node in the BIN block is generated according to the enable clock monitoring unit 27 outputting an interrupt to the counter BCPA and the enable signal of the clock and alarm monitoring time control unit 26. The reception alarm monitoring unit 28 monitors whether the received alarm is changed and outputs an interrupt to the counter BCPA when there is a change.

The operation of the redundant apparatus of the BCPA of the communication system according to the present invention configured as described above will be described with reference to the flowchart of FIG. 3.

The watchdog clock control function in the present invention is a function for causing the CPU 21 to reset itself when the CPU 21 enters an infinite loop in software during operation.

Before the CPU 21 is initialized, the watchdog clock monitoring unit 25 defaults to a watchdog clock as the CPU clock, and after the CPU 21 is initialized, the clock controlled by the CPU 21 is controlled. The watchdog clock control register 23 controls the selection operation of the 2: 1 mux 24 to be input to the watchdog clock.

The watchdog clock control register 23 is a register for the CPU 21 to select a watchdog clock, and an initial value is set so that the CPU clock is selected.

The watchdog clock generation register 22 operates a timer so that the CPU 21 generates an interrupt every predetermined time, and each time the interrupt occurs, the CPU 21 writes 1s and 0s to the register 22. If there is no change in the watchdog clock input within a predetermined time, the watchdog clock monitoring unit 25 resets the watchdog clock.

In other words, if the CPU 21 falls into an endless loop, this function cannot be performed, so that the CPU 21 resets itself.

Referring to the operation of the redundant apparatus of the BCPA of the present invention operating as described above in detail, the board initialized first of the A-side BCPA (20-1) and B-side BCPA (20-2) is active, the remaining board When starting to operate in standby mode, the active BCPA records the status information of the boards of each block in the base station and the information such as call allocation to the channel card every time it is changed in its disk.

The standby BCPA then monitors this to correctly perform the active operation and copies the information.

Next, as shown in the flowchart of FIG. 3, it is determined whether or not the other party BCPA has hernia or failed in the BCPA (S1) and if the other party BCPA has hernia or failed to operate the BCPA active (S2), the other party BCPA is hernia or If it does not fail, it operates its BCPA as a standby and monitors the state of the active BCPA (S3).

Subsequently, in the active BCPA that is active, it is determined through the reception alarm monitoring unit 28 whether an alarm corresponding to a problem has been received from the node of the BIN block connected with itself (S3).

If the alarm is received in the step S3, the CPU 21 in the BCPA of the active side sends a packet for a loop back test to the corresponding node (S4). If the alarm is not received, the received clock monitor 27 In step S5, it is determined whether the HDLC communication clock is not received from the BIN block.

If the clock is not received in the step S5, the CPU 21 sends a packet for the loop back test to the corresponding node as in the step S4 (S6).

Subsequently, it is determined whether the corresponding node in the BIN block has received the packet for the loop back test sent in steps S4 and S6 (S7). S9), an interrupt is generated to the other party BCPA on the standby side (S11).

That is, the CPU 21 checks a corresponding node when an alarm occurs or a clock is not received from the BIN block. The CPU 21 performs a loopback test by sending and receiving an HDLC format packet having its address set to the corresponding node. If there is no response from the node, the corresponding node, which is the communication path connected to the node, is considered to be a failure, and it resets itself so that BCPA on the other party's standby side operates as an active and generates an interrupt to the other party.

Thereafter, if the clock is received in the step S5, the watchdog clock monitor 25 determines whether the watchdog clock has not occurred within 1 second (S8). Considers that it is in an infinite loop, resets itself (S9), and generates an interrupt to the other party BCPA on the standby side (S11).

If the watchdog clock is generated within one second in step S8, it is determined whether the CPU 21 is normal (S10). If the CPU 21 is not normal, an interrupt is generated to the counterpart BCPA on the standby side (S11). .

Then, the standby BCPA is active by the interrupt generated in step S11.

As described above, if the node in the BIN block connected to BCPA itself is abnormal, fails to exit from an infinite loop, or if a problem occurs in the CPU, the BCPA on the standby side is activated by generating an interrupt to the other BCPA. .

As described above, the present invention does not deteriorate the performance of the CPU by using an interrupt method instead of a polling scheme in the redundant operation of the BCPA in the base station of the communication system, and also when the node failure of the BIN block during the base station operation In case of not being able to break out in an endless loop through software, it is possible to reset itself and perform the correct transfer to the other party, so that the service personnel can prevent the disconnection of the call service without having to go to the field and repair it for the normalization of the system. In this way, the reliability of the entire base station system and the quality of service can be improved.

Claims (2)

A redundancy apparatus for redundant operation of a BCPA having a redundant configuration connected to a node of a BIN block in a base station of a communication system, CPU that controls the operation of each component block during BCPA redundancy operation, watchdog clock generation register that generates a watchdog clock according to the control signal of the CPU, and the CPU until the CPU is initialized according to the control signal of the CPU. A watchdog clock control register for outputting a selection control signal for selecting a clock dog clock generated in the watchdog clock generation register as a watchdog clock after the CPU is initialized, and the watchdog clock control register; A 2: 1 mux for selecting a watchdog clock generated by the CPU clock or the watchdog clock generation register according to a control signal of and a watchdog clock selected and outputted from the 2: 1 mux without changing for a predetermined time A watchdog clock monitoring unit for hardware reset to the CPU, and counting the CPU clocks A clock and alarm monitoring time control unit for generating a surface enable signal to monitor time, and receiving and monitoring whether or not a reception clock for HDLC communication has not been received from the BIN block for a predetermined time according to the enable signal of the clock and alarm monitoring time control unit When the clock is kept high or low for a predetermined time, the reception clock monitoring unit outputs an interrupt to the counter BCPA, and an alarm indicating a node failure from the node in the BIN block is enabled by the enable signal of the clock and alarm monitoring time control unit. And a receiving alarm monitoring unit for outputting an interrupt to the counter BCPA when the received alarm is changed by monitoring whether the received alarm has changed. A redundancy method for redundant operation of a BCPA in a redundant configuration connected to a node of a BIN block in a base station of a communication system, A first step in determining whether the other BCPA has hernias or failures in her BCPA; if the other BCPA has hernias or failed in the first step, her BCPA is active; if her BCPA has not hernias or failed Operation as a standby and monitoring the state of the active BCPA, and after performing the second step, whether the active BCPA receives an alarm according to a problem from the node of the BIN block connected to it through the reception alarm monitor. In the third step of determining, and if the active BCPA receives an alarm in the third step, the CPU in the active BCPA sends a packet for loop back test to the node, and if the alarm is not received, the BIN block through the received clock monitor. Determining whether a clock for HDLC communication has not been received from the fourth step; and not receiving the clock in the fourth step. And if the CPU in the active BCPA sends a packet for loop back test to the node and receives the clock, the fifth step of determining whether the watchdog clock has not occurred within 1 second through the watchdog clock monitoring unit; and the fourth step. A sixth step of determining whether the node has received the packet for the loop back test sent in the step and the fifth step; and in the fifth step, the watchdog clock does not occur within 1 second or the node in the sixth step If the packet is not received, it resets itself, and if the watchdog clock occurs within 1 second in the standby step BCPA that is the standby side, and if the watchdog clock occurs within 1 second, the CPU determines whether the CPU is normal. If not, standby is performed by the eighth step of generating an interrupt to the other party's BCPA on the standby side and by the interrupts generated in the seventh and eighth steps. Redundancy method of the base station control card of the communications system, characterized by BCPA is made of an ninth step of operating the active.