KR100670075B1 - Connection administrate method by checking trunk of a cellular communication system - Google Patents

Abstract

The present invention provides a method for managing a call connection through monitoring a circuit between stations in a cellular mobile communication system to monitor the abnormality of the trunk between the base station and the switching center, thereby facilitating the call connection of the terminal, and to provide efficient operation and continuous call connection service. It is about. The present invention inputs various errors of trunk trunks detected from the framer chip registers to the main CPU of the base station to count the number of occurrences of each type of error, and when the number of error occurrences rises above the reference value, an RF output transmitted from the base station to the terminal. Control to ensure that the call service is delivered to the adjacent base station. In addition, it is preferable to set the grade for each stage according to the magnitude of the number of occurrences of each type of error of the trunk, determine whether the trunk is available according to the grade, and display it. Therefore, it is effective to provide the maximum call service to the subscriber using the terminal through the adjacent base station, and to easily find the cause of the call disconnection to make the diagnosis to the operator more efficient and to make the best use of the available resources. Can be.

Description

Connection administrate method by checking trunk of a cellular communication system in cellular mobile communication system             

1 is a block diagram of a general CDMA mobile communication system;

2 is a cell layout diagram of a cellular mobile communication system according to the present invention;

3 is a control flowchart of a call connection management method through inter-line monitoring in a cellular mobile communication system according to the present invention;

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

10, 10 ': base station 20: control station

30: exchange 50: terminal

100, 100 ': trunk 110: framer chip register

120: base station main CPU 130: control station link control CPU

The present invention relates to a cellular mobile communication system, and more particularly, to monitor inter-line circuits of a cellular mobile communication system for monitoring the inter-line circuits (hereinafter referred to as trunks) for efficient operation of the system and providing continuous call connection services. It relates to a call connection management method through.

As is well known, a mobile communication system maintains communication between mobile bodies such as vehicles, aircrafts, trains, ships, and the like by connecting each other to fixed points. Recently, frequency division multiple access (FDMA) and TDMA ( BACKGROUND ART A mobile communication system employing various multiplexing schemes such as time division multiple access (CDMA) and code division multiple access (CDMA) is used.

1 illustrates a general CDMA mobile communication system.

As shown, the CDMA system is divided into three major parts: a base transceiver system (BTS) 10, a base station controller (BSC) 20, and a mobile services switching center (MSC) 30. Divided by. In addition, by having a base station manager (BSM) 40 having a system maintenance and repair function separately from the base station 10, the control station 20, and the switching center 30, the operation convenience and flexibility are improved. Facilitate the design of the system.

The operating station 40 is a work station, which usually includes a system console, a tape drive, and a hard disk, and displays all situations occurring in the base station, and controls the input / output of operations and maintenance commands and results and messages. do. It also connects prints and prints all the output on-line.

The operating station 40 exchanges information with each of the subsystems in the base station 10 and the control station 20 through GCIN having a high-speed packet exchange function, RS-422 connection method, and modified high-level HDLC (high-level). Data Link Control) Communicates on an E1 trunk using the protocol. In addition, functions such as performance management, configuration management, and failure management are provided for the operation and maintenance of the base station 10 and the control station 20.

The control station 20 has a base station 10 that can be extended up to 16, has an LCIN for connecting and communicating with each other, and has a GCIN for IPC communication with the operating station 40 and other control stations 20. The control station 20 also has up to 40 Transcoding Selector Banks (TSBs) 22 for voice calls. The TSB 22 has six Selector Vocoder Processors (SVPs) 22b on which eight Vocoders are mounted, and a SIP (Selector Interface Processor) 22a manages them and routes voice.

Two T1 trunks are connected to the switch per TSB 22. In addition, the LCIN for IPC (Inter Processor Communication) communication between the base station 10 and the vocoder is duplicated. There is a duplicated Call Control Processor (CCP) 21, which is a processor that controls the control station 20 and the subordinate base station 10, and communicates with RS-422 for interworking with the exchange.

The base station 10 includes approximately four channel cards (CCs) 11 and a redundant base station control processor (BCP) 12 that manages the entire base station 10 and controls the call. (10) There is a BIN for routing internal communication and communication with the control station 20. Although not illustrated in the drawing, a digital unit (DU) performing a signal processing function related to a CDMA channel, a time and frequency unit (TFU) providing a reference frequency and timing to a base station, and a radio unit responsible for RF signal processing Unit).

The conventional mobile communication system configured as described above provides a good call service to the user through communication between the terminal and the base station as well as each device in the system, and communication between the base station and the switching center. In addition, the resources for such a call service can appear in many forms, and an efficient operation method has been devised in various forms.

However, the conventional method of controlling or operating a mobile communication system is limited to visible resources. That is, only resources between protocols and base stations within each resource are managed, and when a failure occurs due to other causes, it is difficult to detect them, and may cause a fatal problem to call service.

In particular, the errors occurring in the trunk connecting the base station and the control station act as a cause of call truncation, and in more severe cases, may result in an inability of call service. Since there is a problem that there is no function, there is a recent demand for detailed management and efficient operation.

Accordingly, the present invention has been made to solve the above-mentioned problems, the purpose of which is to monitor the abnormality of the trunk between the base station and the switching center to facilitate the call connection of the terminal to efficiently operate the system and continuous call connection service The present invention provides a method for managing call connection through inter-line monitoring of a cellular mobile communication system.

A feature of the call connection management method of inter-station line monitoring of a cellular mobile communication system according to the present invention for achieving the above object is to input various errors of the inter-station trunk detected from the framer chip register to the main CPU of the base station. The number of occurrences by type is counted, and when the number of error occurrences rises above the reference value, the RF service transmitted from the base station to the terminal is controlled so that the call service is delivered to the adjacent base station.

In addition, it is preferable to set the grade for each stage according to the magnitude of the number of occurrences of each type of error of the trunk, determine whether the trunk is available according to the grade, and display it.

Hereinafter, with reference to the accompanying drawings, preferred embodiments of a method for managing a call connection through inter-line monitoring in a cellular mobile communication system according to the present invention will be described in detail, but the same components as in the prior art will be described with the same reference numerals.

2 is a cell layout diagram of a cellular mobile communication system according to the present invention, and FIG. 3 is a control flowchart of a method for managing call connection through inter-line monitoring of a cellular mobile communication system according to the present invention.

As shown in FIG. 2, the mobile system currently in operation is divided into a mobile terminal 50, a base station 10, a control station 20, and an exchange station 30. The terminal 50 and the base station 10 are generally connected by a wireless interface, and the connection between the base station 10 and the control station 20 or between the control station 20 and the switching center 30 is connected by a wired interface to each other. Perform communication functions.

Here, the connection between the base station 10 and the control station 20 or the control station 20 and the switching center 30 is connected to the T1 or E1 trunk (100, 100 '), such a T1 trunk and E1 trunk The types of errors that can be detected in (100) (100 ') include Loss Of Signal (LOS), Alarm Indication Signal (AIS), Frame Synchronization Fail, Cyclic Redundancy Check (CRC) Error, and Slip Error. There is this. These errors can be detected by monitoring the register 110 of the Framer Chip of E1 / T1 shown in FIG.

The terminal 50 receives an over head channel transmitted through an RF amplifier (not shown) in the base station 20. Accordingly, if the initial call setup is successful, the traffic channel from the base station 10 is received. Enter a call service through a traffic channel. If the terminal 50 does not receive any signal from the cell of the base station 10, the terminal 50 receives the signal of the neighbor base station 10 'and receives the call service from the base station 10'.

The operation of the present invention configured as described above will be described in more detail with reference to FIG. 3.

The terminal 50 is an example of a signal amplified through an RF amplifier in the base station 10 in order to receive a call service from the base station 10 of the corresponding cell, and includes an RF signal including a paging channel, a pilot sync channel, and an access channel. By receiving the initial call setup is made.

If the base station 10 does not transmit an overhead channel such as a paging channel to the terminal 50 in the cell, the terminal 50 in the cell receives a signal transmitted from the neighboring base station 10 ', and A call attempt can be made to the base station 10 'to receive continuous call service.

In this state, as shown, the main CPU 120 in the base station 10 periodically monitors the value of the register 110 of the frame chip for detecting a trunk error, which occurs in the trunk 100, 100 ′. Various errors are detected and counted to calculate the ratio of the number of error occurrences at regular intervals.

When the ratio of the number of error occurrences calculated above rises above the reference value, that is, depending on the type and frequency of the detected errors, the base station 10 may be in a degraded sound quality, a reduced call rate, or a call service may be impossible. .

Therefore, according to the count count of the error calculated above, the risk level is classified into critical, major, minor, normal, etc., and then trunk 100, 100 '. ) Is determined to be dangerous or very dangerous by the main CPU 120 in the base station 10, the call output rate can be increased by bringing down the RF output of the base station 10 and inducing a call service to an adjacent base station.

In detail, the BCP 12 stores the alarm and error count values by first reading the value of the register 110 of the framer chip in small units every 128 ms in the case of an E1 trunk. Then, the control corresponding to the value is executed in 500ms unit again. At this time, in the case of the E1 trunk, the minimum period during which the state change such as synchronization is lost or restored is 128 ms, and the error count value is stored every 128 ms.

Further, in order to secure more accurate control data, communication with the link control CPU 130 of the control station 20 attempts to receive data related to the detected trunk 100 and 100 'and reflects it in the statistical data. As described above, the types of errors thus obtained include sync, multi-sync, BER, CRC, LOS, AIS, SLIP, and the like. It is preferable to calculate statistical data in units of one minute except for AIS and LOS. .

When the AIS and LOS errors occur, the communication between the base station 10 and the control station 20 is not possible. Therefore, the RF amplifier outputs a signal of the base station 20 to the terminal 50 at the request of a preset operator. Blocking

If it is not an AIS or LOS error, the operator can set the class of error that can occur so that the above control can be effectively performed. In the case of very high risk, the blocking control of the RF amplifier in the base station 10 is performed as in the case of the AIS and LOS errors.

That is, if it is determined that the alarm count determined by the operator is very dangerous, the main CPU 120 controls not to transmit the RF output signal, and if it is determined that the risk or caution is determined, the link diagnosis is performed at the operator's decision. The blocking control of the RF amplifier may be terminated by the link error condition or normal by the operator. On the other hand, when the count count of errors is normal, unblocking control is performed on the RF amplifier in the base station 10.

Therefore, when a serious error occurs in the trunk trunks 100 and 100 'as described above, the terminal 50 controls the RF output of the base station 10 so as to allow the terminal 50 to provide a call service to a neighboring base station 10' which can be serviced. Induce. That is, if the mobile terminal 50 does not receive an overhead channel from the base station 10 in the cell, the terminal 50 will attempt to call the adjacent base station 10 'with the highest reception sensitivity and this neighbor base station. If the call setup is successful at 10 ', then the call service is received from the base station 10'.

In addition, by setting the grade for each step according to the magnitude of the number of occurrences of each type of error in the trunk (100, 100 '), by determining the availability of the trunk (100) (100') in accordance with this grade, the operator Make it easy to find the cause of service failure and reflect it in system operation.

As described above, according to the call connection management method of inter-station line monitoring of the cellular mobile communication system according to the present invention, the statistical data of the trunk detected by the base station is used based on the actual value of the operator who has determined that the trunk has an abnormality. By controlling the RF output, it is possible to provide the maximum number of calls to the subscribers using the terminal through the adjacent base station by not transmitting the overhead channel to the terminal. There are various effects, such as making the resource more efficient and making the most of available resources.

Claims (2)

Input various errors of trunk trunk detected by framer chip register to main CPU of base station to count the number of occurrences of each type of error, and control the RF output from the base station to the terminal when the number of errors rises above the standard value. A method for managing call connection through inter-line monitoring of a cellular mobile communication system, wherein a call service is transmitted to an adjacent base station. The inter-line circuit monitoring of a cellular mobile communication system according to claim 1, wherein a class is set in stages according to the number of occurrences of each type of error of the trunk, and it is determined whether or not the trunk is available according to the class. Call connection management method through.

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