KR20010018262A - Method for managing nodes fault error of base station in a digital mobile communication system - Google Patents

Abstract

PURPOSE: A method for managing a node fault of a base station transceiver subsystem(BTS) and a base station controller(BSC) in a digital mobile communication system is provided to dynamically change only threshold of a fault error margin and a cyclic redundancy check(CRC) margin without the change of hardware such as a high capacity inter-processor communication(IPC) control assembly(HICA) and a read only memory(ROM). CONSTITUTION: Each reference threshold is set up for a fault error margin and a cyclic redundancy check(CRC) error margin according to nodes. Whether communication between a base station manager(BSM) and each high capacity inter-processor communication(IPC) control assembly(HICA), inside a gateway code division multiple access(CDMA) interconnection network(GCIN), local CDMA interconnection network(LCIN) and base station transceiver subsystem(BTS) interconnection network(BIN) is normally performed or not. If the communication is normally performed, each set threshold is respectively transmitted to the HICAs of the GCIN, LCIN, BIN through the BSM. The transmitted thresholds are respectively transmitted to each node of the GCIN, LCIN, BIN. A fault error rate and a CRC error rate are calculated. The calculated fault error rate and the CRC error rate are respectively compared with a reference fault error margin and CRC error margin according to each node. If the calculated fault error rate and the CRC error rate are larger than the reference fault error margin and CRC error margin, a corresponding node is decided to have a fault. Information on fault generation is transmitted to the BSM in each HICA at predetermined intervals.

Description

Method for managing nodes fault error of base station in a digital mobile communication system in digital mobile communication system

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital mobile communication system. In particular, in a digital mobile communication system, an operator can control a base station and control thresholds for failure management of each node of a base station and a control station through a base station and a base station manager. The present invention relates to a method for managing node failure of a base station and a control station in a digital mobile communication system, which transmits to a high-capacity IPC control assembly (HICA) installed in a station to manage node failure of the base station and a control station. That is, the present invention allows the operator to directly determine the node failure management threshold of the base station and the control station to perform failure management for each node.

In general, a base station transceiver subsystem (hereinafter referred to as a BTS) in a digital mobile communication system transmits and receives data signals and voice over a wireless section, controls a terminal (for example, PCS and DCS), monitors call quality, and moves. It has a function of connecting a base station controller (BSC) and a terminal to each other. That is, the BTS is located between the mobile station and the control station to perform a matching function of wired and wireless channels, and performs a main function related to a radio link. Here, the main functions related to the radio link are forward power allocation and management functions for code division multiple access (CDMA) frequency, channel, and frame option resources, and calling and incoming calls, soft and hard handoff calls ( Handoff call) signal processing, GPS time information reception and management, and system time information in the mobile station and base station apparatus.

In addition, the BTS controls radio signal transmission / reception function, traffic and control information through a pilot channel, a sink channel, an access channel, a paging channel, and a traffic channel. It has the function of providing routing to the station, error detection and statistics information collection and reporting in the BTS.

BTS equipped with these functions is a hardware structure that is easy to expand and implements a real-time O / S environment for real-time multiprocessing. In addition, it is a structure for multi-frequency and high-capacity service, and it is possible to support the critical board redundancy design such as BCP (BTS Control Processor) and complex test, and it has a dynamic configuration and easy management.

The connection configuration and operation of the BTS and the control station in a general digital mobile communication system will be described with reference to the accompanying drawings.

FIG. 1 is a block diagram of a base station of a general digital mobile communication system. Referring to FIG. 1, a configuration of a base station control processor (BTS Control Processor) which operates and manages one BTS 20 as a whole is illustrated. The BCP 20 performs a packet router function between the BTS 20 and the control station (hereinafter referred to as BSC) 10 through the E1 line or the T1 line. 20, a base station network matching unit (hereinafter referred to as a BIN) 22 for interfacing high-level Data Link Cotrol (HDLC) packet data between processors in each processor, and generating a reference frequency and a timing synchronization signal to generate a BTS (BTS). 10) a time and frequency unit (hereinafter referred to as TFU) 23 for synchronizing each processor in the processor and performing timing synchronization with a neighboring BTS, and data signals and sounds transmitted and received through a CDMA channel; A digital signal processing unit (hereinafter referred to as DU) 24 for converting and demodulating a signal, converts a UHF signal received from a mobile station into an IF signal, and transfers the converted IF signal to the DU 24, It receives an IF signal input from the DU 24, converts it into a UHF signal, and amplifies the converted UHF signal to a predetermined level and comprises a RF unit 25 (RF unit: hereinafter referred to as RFU). .

Looking at the detailed function of the configuration of the base station of the digital mobile communication system, the BIN 22 provides an interface with the BSC 10 and the internal communication path of the BTS 20 by packet routing.

The BCP 21 controls and diagnoses the entire BTS 10 to always perform an appropriate operation, and also plays a role of downloading down related software during the initial operation of the BTS 20.

As shown in FIG. 1, the DU 24 includes a first DU 24a and a second DU 24b to process voice and data signals received or transmitted to each terminal. All relevant signal processing is done here. Therefore, it performs a completely different function from other systems, that is, BTS such as AMPS and TDMA (Time Division Multiple Access).

The RFU 25 converts data signals and voice signals modulated by the first and second DUs 24a and 24b into arbitrary RF frequencies and transmits them to the terminal, and demodulates the modulated data signals and voice signals transmitted from the terminal. And output to the first and second DUs 24a and 24b as digital signals, respectively. The TFU 23 performs a function of receiving and supplying a reference time required by the BTS 20 with a GPS. Therefore, all devices in the BTS 20 have the same timing in synchronization with GPS time.

In order to perform communication from the BCP 21 to the RFU 25 in the BTS 20 of the digital mobile communication system, communication between the processors of each device must be possible, and for the communication between the processors, each device is unique to each device. Must have an address

Hereinafter, a node failure management apparatus of a base station and a control station in a general digital mobile communication system will be described with reference to FIG. 2.

2 is a block diagram of a node failure management apparatus of a base station and a control station in a general digital mobile communication system. The base station 20 includes a base station 20, a control station 10, operator matching, and a system status output function. And a base station / control station manager 40 (hereinafter referred to as BSM) that performs operation management and maintenance functions of the entire control station 10, and the base station / control station manager 40 and the control station 10. A gateway network matching unit 30 (Gateway CDMA Interconnection Network: hereinafter referred to as GCIN) that performs a gateway role between the (Cateway). Here, the base station 20 includes a base station network matching unit 26 (hereinafter referred to as a BIN) which is in charge of the connection between the control station 10 and the base station, and the control station 10 includes a GCIN ( 30) and a local network matching unit 11 (hereinafter referred to as LCIN) which is in charge of connecting the BIN 26 of the base station 20 to each other.

In addition, GCIN 30, LCIN 11, and BIN 26 are each equipped with respective HICAs for performing node failure management. That is, the GCIN HICA mounted in the GCIN 30 serving as a gateway between the control stations 10 and the LCIN HICA mounted in the LCIN 11 in charge of the connection between the Vocoder and the base station 20 and the control. BIN HICA and the like mounted on a BIN 26 that is in charge of the connection between the station 10 and the base station 20.

First, if at least one node fault occurs in the GCIN 30, LCIN 11, and BIN 26, the node failure is reported to the BSM 40, and an unnecessary load is applied to the CRC (Cyclic Redundancy). Check) Although there is an error count, node control by the CRC error packet is not performed. Here, CRC is a type of error detection method used for group error detection in data transmission, and a method of checking an error using a polynomial code for error detection in addition to the minimum bits unnecessary to represent data. In addition, ITU-T (formerly CCITT) recommends a basic polynomial (16th polynomial) for creating a traversal code, and adopts this polynomial for error control of frames in HDLC (High Level Data Link Control).

In addition, gateway switching is frequently caused by an error packet inputted from E1 / T1, which degrades the quality of the communication packet.

Each node of GCIN (30), LCIN (11), and BIN (26) detects an alarm differently according to the counterpart HICA and handles the failure. There is a case where the detection of node failure is prevented.

In addition, the time and state control method for detecting a node failure stored in the HICA has a big problem that the node cannot be used due to a non-critical error because the alarm continues until the memory (ROM) is replaced.

Accordingly, the present invention has been made to solve the above-mentioned problems according to the prior art, and an object of the present invention is to change the threshold dynamically when a node fails, so that the node failure can be immediately dealt with, and the threshold The present invention provides a method for managing a node failure of a base station / control station in a digital mobile communication system that allows the operator to directly adjust and to easily perform a quality test on how much an error occurs in a corresponding node. In other words, each HICA requires a fault error margin and a CRC error margin threshold to perform fault management according to node type (general node, gateway node, base station link node), and so on. Node failure management that allows the node type and node threshold to be directly input by the BSM to each HICA as needed, and each node can perform node failure management based on the threshold received from HICA. In providing a method.

In the digital mobile communication system according to the present invention for achieving the above object, the node failure management method of the base station / control station is characterized by a digital with a GCIN, LCIN, BIN including the BSM and HICA for managing the failure of each node A method for managing node failure in a mobile communication system, the method comprising: setting reference thresholds for fault error margin and CRC error margin for each node; Comparing and determining whether communication between the BSM and the HICA in the GCIN, LCIN, and BIN is normally performed; As a result of the determination, when communication between the BSM, GCIN, LCIN, and HICA in the BIN is normally performed, transferring the set thresholds to the respective GCIN, LCIN, and BIN HICA through the BSM; Transmitting the received thresholds to respective nodes in the GCIN, LCIN, and BIN, respectively; Calculating a fault error rate and a CRC error rate; Comparing the calculated fault error rate and the CRC error rate for each node with a reference fault error margin and a CRC error margin; As a result of the comparison, if the calculated fault error rate and CRC error rate are greater than the reference fault error margin and CRC error margin of each node, it is determined that a failure occurs in the corresponding node and the failure occurrence information is transmitted from the respective HICA to the BSM at regular intervals. In steps.

According to another aspect of the present invention, when the BSM does not operate normally and communication between HICAs is not normally performed, the threshold value input by the operator is directly changed in each HICA, and the changed threshold value is stored in the GCIN, LCIN, and BIN. It is delivered to the threshold corresponding to each node.

1 is a block diagram showing a connection configuration between a base station and a control station in a general digital mobile communication system;

2 is a block diagram of a node failure management apparatus of a base station and a control station in a general digital mobile communication system;

3 is a flowchart illustrating a method for managing node failure of a base station and a control station in a digital mobile communication system according to the present invention.

<Explanation of symbols for main parts of drawing>

10: control station 11: local network matching unit

20: base station 26: base station network matching unit

30: gateway network matching unit

40: base station / control station management unit

Hereinafter, a preferred embodiment of a method for managing node failure of a base station / control station in a digital mobile communication system according to the present invention will be described in detail with reference to FIGS. 2 and 3.

3 is a flowchart illustrating an operation of a node failure management method of a base station / control station in a digital mobile communication system according to the present invention.

First, FIG. 2 shows a GCIN 30, an LCIN 11, and a BIN 26 in which an HICA performing node management in a BSM 40, a control station 10, and a base station 20 in a digital mobile communication system is located. It shows the connection between the two.

In the digital mobile communication system, the BSM 40 performs the operation management and maintenance functions of the base station 20 and the control station 10 as a function of operator registration and system status output, and the GCIN HICA performs multiple operations with the BSM 40. Network management of the IPCUN (Inter Process Communication Unit Network) consisting of nodes that control the communication path between the control station 10, LCIN HICA is a communication between the processors in the control station 10 and the base station 20 BIN HICA performs network management of IPCUN composed of nodes controlling the connection communication path between the control station 10 and the subsystem of the base station 20. .

The node failure management method of the base station / control station in the digital mobile communication system using the node management device configured as described above will be described step by step with reference to FIG.

First, threshold values of fault error margin and CRC error margin for each node type, such as a general node, a gateway node, and a base station link node, are set in a PLD (Program Loading Data), which is a shape and operation information of a digital mobile communication system (S101).

When the BSM 40 is operated while the threshold value is set and stored in the PLD, it is determined whether a new threshold value for changing the set threshold value has been input from the operator (S102). That is, it is determined whether the threshold value change for the fault error margin and the CRC error margin for each node type such as a general node, a gateway node, and a base station link node stored in the PLD is requested from the operator.

As a result of the determination, when a new threshold for changing the threshold is input from the operator, the new threshold, that is, the fault error margin and the CRC error margin threshold for each node type is updated in the database. (S103).

Subsequently, the HICA between the BSM 40 and the GCIN 30 determines whether the communication is normally performed (S104). If the HICA between the BSM 40 and the GCIN 30 does not communicate normally, the operator inputs the communication. After the threshold is directly input by the HICA of the GCIN 30, the threshold is changed (S105), and the changed threshold is transmitted to each node of the GCIN 30 (S107).

On the other hand, if the HSM of the BSM 40 and the GCIN 30 is normally communicated as a result of the determination in step S104, the threshold value stored in the database is transferred to the HICA of the GCIN 30 (S106), and the delivered threshold is The HICA of the GCIN 30 transmits the information to each node of the GCIN 30 (S107) and simultaneously determines whether the HICA of the GCIN 30 and the HICA of the LCIN 11 communicate normally (S110).

At this time, when a threshold value is transmitted to each node of the GCIN 30, after calculating a fault error rate and a CRC error rate within a predetermined time interval, the calculated fault error rate and CRC error rate for the corresponding node are calculated based on the set threshold, that is, a predetermined reference fault. Compare with error margin and CRC error margin, respectively. As a result of the comparison, it is determined whether the calculated fault error rate and CRC error rate for the corresponding node are greater than the set reference fault error margin and CRC error margin (S108).

As a result of determination, when the calculated fault error rate and CRC error rate for the corresponding node are smaller than the preset reference fault error margin and CRC error margin, the GCIN 30 node determines that no failure has occurred, and then normally communicates with the BSM. On the contrary, if the calculated fault error rate and CRC error rate for the corresponding node are larger than the preset reference fault error margin and CRC error margin, it is determined that the failure has occurred in the corresponding node and reported to HICA of GCIN 30. , HICA of the GCIN 30 will report that the failure occurred to the BSM 40 again (S109).

Subsequently, as a result of determining whether the HICA of the GCIN 30 and the HICA of the LCIN 11 are normally communicated in step S110, when the communication is not normally performed, the threshold value input by the operator is directly input by the HICA of the LCIN 11. After receiving the input threshold value change (S111), the changed threshold value is transmitted to each node of the LCIN (110) (S107).

On the other hand, when the determination result in step S110, when the HICA of the GCIN 30 and the HICA of the LCIN 11 is normally communicated, the threshold value stored in the database is transmitted to the HICA of the LCIN 11 (S112), The threshold is passed from the HICA of the LCIN 11 to each node of the LCIN 11 again (S107), and at the same time, it is determined whether the HICA of the LCIN 11 and the HICA of the BIN 26 are normally communicated (S113).

At this time, if a threshold value is transmitted to each node of the LCIN 11, after calculating the fault error rate and CRC error rate within a predetermined time interval, the calculated fault error rate and CRC error rate for the corresponding node are calculated based on the predetermined reference fault error margin and CRC. Compare with error margin respectively. As a result of the comparison, it is determined whether the calculated fault error rate and CRC error rate for the corresponding node are greater than the set reference fault error margin and CRC error margin (S108).

As a result of determination, when the calculated fault error rate and CRC error rate for the corresponding node are smaller than the preset reference fault error margin and CRC error margin, it is determined that no failure has occurred in the LCIN node, and then communication with the GCIN 30 normally. On the contrary, if the fault error rate and CRC error rate calculated for the node are larger than the preset reference fault error margin and CRC error margin, it is determined that the failure has occurred in the corresponding node and reported to HICA of LCIN (11). Then, the HICA of the LCIN 11 is to report that the failure occurred to the BSM 40 again (S109).

Subsequently, as a result of determining whether the HICA of the LCIN 11 and the HICA of the BIN 26 are normally communicated in step S113, if the communication is not normally performed, the threshold value input by the operator is directly determined by the HICA of the BIN 26. After receiving the input threshold value change (S114), the changed threshold value is transmitted to each node of the BIN (26) (S107).

On the other hand, if the HICA of the LCIN 11 and the HICA of the BIN 26 communicate normally as a result of the determination in step S113, after passing the threshold stored in the database to the HICA of the BIN 26 (S115), the BIN ( In the HICA of 26), the threshold value is transmitted to each node of the BIN 26 (S107).

At this time, if a threshold value is transmitted to each node of the BIN 26, after calculating a fault error rate and a CRC error rate within a predetermined time interval, the calculated fault error rate and CRC error rate for the corresponding node are calculated based on a reference fault error margin and a CRC error. Compare margins respectively. As a result of the comparison, it is determined whether the calculated fault error rate and CRC error rate for the corresponding node are greater than the set reference fault error margin and CRC error margin (S108).

As a result of the determination, when the calculated fault error rate and CRC error rate for the corresponding node are smaller than the preset reference fault error margin and CRC error margin, it is determined that a failure has not occurred in the BIN 26 node, and communication with the LCIN 11 is normally performed. If the calculated fault error rate and CRC error rate for the corresponding node are greater than the preset reference fault error margin and CRC error margin, it is determined that the failure occurred in the corresponding node and reported to the HICA of BIN 26. In addition, the HICA of the BIN 26 reports the failure to the BSM 40 again (S109).

In the digital mobile communication system according to the present invention as described above, the base station / control station node failure management method will be briefly summarized.

First, when the BSM 40 is operated, the threshold values of fault error margins and CRC error margins for each node type, such as a general node, a gateway node, and a base station link node, stored in a PLD, which are shapes and operation information of a digital mobile communication system, are internal. When stored in the database and periodically communicating to monitor the status of the GCIN 30 HICA, the thresholds stored in the database are passed to the HICA of the GCIN 30.

The HICA of GCIN 30 then passes the threshold to the HICA of LCIN 11, and the HICA of LCIN 11 passes the threshold to BIN 26 HICA.

If the BSM 40 does not operate normally and communication between the upper HICA and the lower HICA does not operate normally, each HICA may receive a threshold directly, and each HICA may transmit the received threshold to each node. Will be.

If each node receives a fault error rate and CRC error rate within a certain time interval by using the node type, node-specific fault error margin, and CRC error margin notified by HICA, the node is determined to be a failure. Report to each HICA. Here, the predetermined time interval is 30ms in the case of a general node, the base station link and the gateway node is 1sec.

Each HICA that has received the failure information of the node collects this information and reports it to the BSM 40 at a predetermined time period (about 2 seconds).

Here, the fault error rate and CRC error rate can be obtained by the following equations (1) and (2).

Fault Error Free (%) = Fault Count / Total Packet Count

CRC error rate = CRC Count / Total Packet Count

As a result, the operator can refer to the PLD at any time to know the current threshold. If necessary, the node can be dynamically managed by changing the PLD, updating the database, and passing the new threshold to the HICA.

In the digital mobile communication system according to the present invention as described above, the node failure management method of the base station / control station directly transmits the node failure management threshold to the HICA through the BSM, and each HICA delivers the threshold value to the corresponding node. Each node performs node failure management based on the threshold received from HICA and can immediately respond to a failed node by dynamically changing only the fault error margin and CRC error margin without changing hardware such as HICA ROM. It has an effect.

In addition, by monitoring the status of the node while changing the threshold value, it is possible to determine the quality of the node, and to control the node error that does not affect the operation of the system, unnecessary messages to the BSM. There are other effects that can block the transmission.

In addition, by reducing the frequent switching of the gateway has the effect of improving the quality of the communication packet.

Claims (6)

A method for managing a node failure of a base station / control station in a digital mobile communication system having a BSM, Setting reference thresholds for fault error margin and CRC error margin for each node in the base station and control station, respectively; When the communication between the BSM and the control station and the base station is normally performed, transmitting the set reference threshold value from the BSM to the control station and the base station, and transmitting the received threshold value from the control station and the base station to the corresponding node; a) calculating a fault error rate and a CRC error rate within a predetermined time at each node in the base station and the control station; b) if the calculated fault and CRC error rate is greater than a threshold received for each node of the base station and the control station, determining that a failure has occurred in the corresponding node and transmitting the failure occurrence information to the BSM. Node / control station node failure management method in a digital mobile communication system. In the node failure management method of a digital mobile communication system having GCIN, LCIN, and BIN including HSM that manages the failure of BSM and each node, Setting reference thresholds for fault error margin and CRC error margin for each node, respectively; Comparing and determining whether communication between the BSM and the HICA in the GCIN, LCIN, and BIN is normally performed; If it is determined that communication between the BSM, GCIN, LCIN, and HICA in the BIN is normally performed, sequentially transmitting the set thresholds to each GCIN, LCIN, and BIN HICA through the BSM; Forwarding the received threshold to a threshold corresponding to each node in the GCIN, LCIN, and BIN; Calculating a fault error rate and a CRC error rate; Comparing the calculated fault error rate and CRC error rate with a reference fault error margin and a CRC error margin for each node received; As a result of the comparison, when the calculated fault error rate and CRC error rate are larger than the reference fault error margin and CRC error margin for each node received, it is determined that a failure occurs in the corresponding node, and failure occurrence information is determined at a predetermined time period in each BICA. Node failure management method of the base station / control station in a digital mobile communication system, characterized in that the step of transmitting to. The threshold value input by the operator according to claim 1, wherein the BSM does not operate normally and the communication between the respective HICAs is not performed normally in the step of comparing whether the communication between the BSM and the HICA in the GCIN, LCIN, and BIN is normally performed. The node failure management method of the base station / control station in the digital mobile communication system, characterized in that after directly changing in each HICA, the changed threshold is transmitted to each node in the GCIN, LCIN, BIN. 2. The method of claim 1, wherein in calculating the fault error rate and the CRC error rate, the fault error rate is a value obtained by dividing the number of fault counts by the total packet count, and the CRC error rate is a value obtained by dividing the number of CRC counts by the total packet count. Node Node / Control Station Node Failure Management Method in Digital Mobile Communication System. The digital mobile communication as claimed in claim 1, wherein in the calculating of the fault error rate and the CRC error rate within the predetermined time, the predetermined time is 300ms for a general node and 1sec for a base station link node and a gateway node. Base station / control station node failure management method in system. 2. The method of claim 1, wherein a predetermined time period in the step of transmitting the failure occurrence information to the BSM at a predetermined time period in each HICA is 2 sec.