KR20010065929A - Method for Checking Error Status of Radio Frequency Processor in a Radio Port of Wireless Local Loop System - Google Patents

Abstract

PURPOSE: A method for checking the abnormality of a board in an RF processing device in a WLL(Wireless Local Loop) base station system is provided to efficiently check the abnormality of an ACSU(Analog and Common interface Sector Unit), taking charge of A/D and D/A functions, in a base station system. CONSTITUTION: An RFC(Radio Frequency Controller) checks the abnormality of the other boards except an ACSU(S101). In case that an abnormal state is detected from a board(S102), the RFC reports it to an RCP(Radio port Control Processor)(S103). If no abnormal state is detected, an RTU(Radio port Test Unit) detects the transmitting power of the final output port(S104). If the transmitting power of the final output port is detected, the RTU detects the gains of an HPA(High Power Amplifier) and a UCC(Up Converter Card)(S105). The RTU calculates an output value of the ACSU using the detected transmitting power and gains(S106). Then the RTU compares the calculated output value with a preset reference output value(S107). In case that the calculated output value is not in the range of the reference output value(S108), the RTU, judging that the ACSU is abnormal, reports the result value to the RCP(S110).

Description

Method for Checking Error Status of Radio Frequency Processor in a Radio Port of Wireless Local Loop System}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wireless subscriber network (WLL) base station system, and has an abnormality of an analog and common interface sector unit (ACSU) board in charge of A / D and D / A functions in a base station system. The present invention relates to a method for checking board abnormality in a high frequency processing apparatus of a wireless subscriber network base station system.

In general, the WLL system has a merit that it is much better than the radio wave environment of the mobile communication network in terms of use as a communication medium through a wireless channel.

In addition, the line-of-sight environment is secured, and the propagation path loss is about 20 dB / decade, so that it can serve a wider area with the same transmission power. Fading due to multipath is much less than that of point-to-point mobile communication network.

Due to these advantages, the development and research of the WLL system is actively underway, and the accompanying drawings of FIG. 1 show a schematic configuration of a general WLL network having the above advantages.

As shown in Fig. 1, network components include network subscriber station 10, 10 ', subscriber access devices 20, 20', base station 30, 30 ', base station controller 40, WLL switching station ( 50), a base station operating device 60, and the like, and additionally, a data communication matching device 70 (IWF: inter-working function) for data service, a home location register (HLR: Home Location Resister / Authentication Center) ( 80).

In addition, the billing center 100 connected to the network management sensor 90, the WLL switch 50 and the data communication matching device 70 is connected to the base station operating device 60 and the WLL switch 50 is further provided.

Let us explain the interface between the network components in the WLL system network configured as described above.

The subscriber access devices 20 and 20 'and the base stations 30 and 30' use the standard WLL radio access standard as the access standard, and the channel bandwidth is 10 MHz. The connection standard between the base stations 30 and 30 'and the base station controller 40 selects and uses E1 or HDSL, and the signaling method uses LAPD (Link Access Protocol D).

The base station controller 40 and the WLL switch 50 use E1 as a connection standard and use ITU-T.G965 as a signaling method.

In addition, the connection standard between the base station controller 40 and the base station operating device 60 uses Ethernet, and as a signaling method, Simple Network Management Protocol (SNMP), File Transfer Protocol (FTP), and Telecommunication Network (TELNET). Etc.

On the other hand, the base station controller 40 and the data communication matching device 70 uses E1 as the connection standard, and uses LAPD as the signaling method. In addition, the connection between the WLL switch 50 and the data communication matching device 70 uses E1 as the connection standard and R2 is used as the signaling method.

The connection standard between the WLL switch 50 and the home position register 80 uses E1, and IS-41C is used as the signaling method.

Let's look at the operation of the WLL system network connected through the connection standard and the signaling method in more detail.

First, the base station (30, 30 ') is a base station control module (RCP) that performs the overall management function for one base station, a modem module performing a signal processing function related to the CDMA channel, high power / low noise amplification and transmission and reception frequency conversion function RF module for performing the step, and a line connection module for performing the relay line (E1) connection function for matching with the base station controller 40, amplification of the transmission signal in the RF module, low noise amplification of the received signal, frequency down / up It performs conversion, reception of diversity through two antennas, high power / low noise amplification, and transmission / reception frequency conversion.

In addition, the modem module provides CDMA channels (pilot channel, sync channel, paging channel, access channel, signaling channel, traffic channel, packet traffic channel, packet access channel), digital baseband function processing, CDMA channel coding and decoding related functions. Do this.

The line connection module performs data communication with the base station controller 40 with respect to traffic and control information, and performs a relay line (E1 / HDSL) function for matching the base station controller 40.

The base station controller 40, which controls the base stations 30 and 30 ', is composed of a transcoder module, a call processing module, a switching module, and a matching module. The transcoder module is a 64 Kbps Pulse Code Modulation (PCM) voice coding signal. It includes a transcoder that performs the conversion function, and echo cancellation is implemented. In addition, the call processing module performs various call processing functions such as incoming / outgoing call processing support and message processing of the base station, subsystem status management in the base station controller 40, and control signal format between the WLL switch 50 and the subscriber access device. It is a processor that has a redundant structure for system reliability. The switching module also provides a traffic path between the base station matching device and the transcoder in the base station controller 40.

In addition, the matching module is composed of a WLL switch matching module, a base station matching module and a base station operating device (60) matching module, dual WLL switch (50) matching module for installing the base station controller 40 remotely with the WLL switch (50) If so, perform the E1 / G.965 digital heavy accounting function. In addition, the base station matching module performs the E1 / LAPD, HDSL relay line matching function between the base station and the base station control, and the base station operating device matching module performs the Ethernet / SNMP, FTP, TELNET matching function during the base station operating device-base station control period.

Next, the base station operating device 60 operates the base station controller 40, the base stations 30 and 30 ', and the subscriber access devices 20 and 20', and is responsible for maintenance and repair of each device.

FIG. 2 is a block diagram illustrating an apparatus for monitoring an abnormal state of a high frequency processing apparatus of the wireless subscriber network base station system. Referring to FIG. 2, the RTU detects an RF transmission output of a base station system. (Radio Port Test Unit) 38, a Radio Port Control Processor (RCP) 31 that controls and manages the entire base station, and modulates data transmitted from the base station controller 40 shown in FIG. A channel card unit (CCU) 32 for demodulating data transmitted from the matching device 20, and converts the data modulated in the CCU 32 into an analog signal, and converts the signal transmitted from the subscriber matching device into a digital signal. ACSU 33 to convert and output to CCU 32, UCC (Up Converter Card) 34 to convert the analog signal output from ACSU 33 to a transmission RF frequency, and RF converted from UCC 34 High Power Amplifie for High Power Amplification of Frequency r) 35, a transmission front unit (TXFU) 36 for transmitting the RF frequency signal amplified by the HPA 35 to the subscriber matching device through an antenna, and detecting the abnormality of each of the devices to detect the RCP ( 31) and a Radio Frequency Controller (RFC) 37 for reporting.

The operation of the device having the above configuration will be briefly described.

The RTU 38 receives a RF signal and has a function of detecting a transmission power transmitted in real time. The RF stage receives a signal of 2.37-2.40 GHz and measures the transmit power.

The signal from the CCU 32 is input to the UCC 34 via the ACSU 33 at a level of 38.4 MHz, -40 to -20 dB.

UCC 34 converts a frequency of 38.4 MHz to a frequency of 2385 or 2395 MHz and has a gain of 0 to 30 dB but a normal gain of 24 dBm. In addition, the frequency and gain of the UCC 34 can be efficiently controlled by the RFC 37.

The output of this UCC 34 is input to the HPA 35, the HPA 35 has a gain of 50dBm, and the presence or more is also reported to the RFC 37. The output of the HPA 35 is radiated to the subscriber matching device via the antenna via the TXFU 36.

Let's look briefly at the board fault condition monitoring method of the base station system composed of such a device.

First, the frequency and gain of the UCC 34 can be controlled by the RFC 37, which is reported to the RCP 31 and the operator.

And, the presence or absence of the abnormality of the HPA (35) is that the RFC (37), TXFU (36) and CCU (32) is also reported to the RCP (31) through the RFC (37). However, there is no suitable device to monitor and control the output or frequency of the ACSU 33.

The RTU 38 also simply detects the transmission power and reports it to the RCP 31, and the RCP 31 reports this directly to the operator. In the RCP 31, only the transmission power and abnormality of each board are reported to the operator. It only serves to convey.

As a result, the problem according to the related art can detect and report abnormalities of other boards to the RCP, but there is a problem in that there is no method for checking the abnormality of the ACSU board or the abnormality of the output of the ACSU. That is, the above monitoring or control has been performed only for each individual block or unit, and there is a problem that each board or unit in the entire RF block does not perform continuity and overall monitoring or control efficiently.

Therefore, the present invention has been made to solve the above problems according to the prior art, an object of the present invention to efficiently check whether there is an abnormality of the ACSU responsible for the A / D and D / A functions in the base station system The present invention provides a method for checking an abnormal state of a board in a high frequency processing apparatus of a wireless subscriber network base station system.

The characteristic of the board abnormality check method in the high frequency processing apparatus of the wireless subscriber network base station system according to the present invention for attaining the above object is that at least one board is abnormal by checking the abnormality of all the remaining boards except the ACSU. Determining whether this has occurred; Detecting a transmission power of a final output stage, a gain of the HPA, and a gain of the UCC, respectively, in the RTU when the abnormal state is not detected in the one board; Calculating an output value of a current ACSU using the detected transmit power and gain values of HPA and UCC; Comparing the calculated current ACSU output value with a preset reference ACSU output value and determining whether the calculated ACSU output value is within a range of an output value of the preset reference ACSU; As a result of the determination, the ACSU is determined to be normal when the calculated value of the ACSU falls within the output value range of the preset reference ACSU, and the ACSU is determined to be abnormal when the calculated value of the ACSU does not fall within the preset range of the reference ACSU. And report the result to the RCP.

1 is a block diagram illustrating a general broadband wireless subscriber network system;

2 is a block diagram of an apparatus for monitoring an abnormal state of a high frequency processing apparatus of a general wireless subscriber network base station system;

3 is a flowchart illustrating a method for checking a board abnormal state in a high frequency processing apparatus of a wireless subscriber network base station system according to the present invention.

<Explanation of symbols for main parts of drawing>

31: RCP 32: CCU

33: ACSU 34: UCC

35: HPA 36: TXFU

37: RFC 38: RTU

Hereinafter, a method for checking a board abnormal state in a high frequency processing apparatus of a wireless subscriber network base station system according to the present invention will be described in detail with reference to the accompanying drawings.

3 is a flowchart illustrating an operation of a method for checking a board abnormal state in a high frequency processing apparatus of a wireless subscriber network base station system according to the present invention.

First, all the boards except the ACSU 33, that is, the CCU (21), UCC (34), HPA (35), TXFU (36) is checked for abnormality (S101).

Subsequently, as a result of the check, it is determined whether at least one board has an abnormality (S102). If an abnormal state is detected even at least one board, it is reported to the RCP 31 (S103), and then the boards have abnormalities. It will be checked for presence.

On the other hand, if no abnormal state is detected in one board in step S102, the RTU 38 detects the transmission power of the final output stage (S104).

Then, when the transmission output is detected, the gain of the HPA 35 and the gain of the UCC 34 are respectively detected (S105).

Subsequently, the output value of the ACSU 33 is calculated using the detected transmission power and gain values of the HPA 35 and the UCC 34 (S106). Here, the output value of the ACSU 33 is calculated using Equation 1 below.

Where R is cable loss, insertion loss, antenna gain, and so on.

When the output value of the ACSU 33 is calculated using Equation 1, the calculated ACSU 33 output value is compared with the preset output value of the reference ACSU 33 (S107).

As a result of the comparison, it is determined whether the calculated output value of the ACSU 33 is within the range of the output value of the preset reference ACSU 33 (S108), and the determination result indicates that the calculated output value of the ACSU 33 is the preset reference ACSU 33. If it is included in the output value range of the) is determined that the ACSU 33 is normal to perform the above process repeatedly (S109).

However, when it is determined in step S108 that the calculated output value of the ACSU 33 is not included in the preset output range of the reference ACSU 33, that is, the output value of the calculated ACSU 33 is output of the reference ACSU 33. If it is below or above the range, the ACSU 33 determines that it is abnormal and reports the result value of the RCP 31 (S110).

As a result, the board abnormality check method in the high frequency processing apparatus of the wireless subscriber network base station system according to the present invention detects the final transmit power of the base station system, detects gain values of HPA and UCC, and then detects each detected value. Calculate the transmit power of the ACSU. If the ACSU output value calculated in this way is included in the preset reference ACSU output range, the ACSU is determined to be normal. If the calculated ACSU output value is not included in the reference ACSU output range, the ACSU is determined to be abnormal and is reported to the RCP. .

As described above, the method for checking board abnormality in the high frequency processing apparatus of the wireless subscriber network base station system according to the present invention detects the final transmit power of the base station system, detects gain values of HPA and UCC, and then detects each detected Use the value to calculate the transmit power of the ACSU. If the ACSU output value calculated as described above is included in the preset reference ACSU output range, the ACSU is determined to be normal. If the calculated ACSU output value is not included in the reference ACSU output range, the ACSU is determined to be abnormal and is reported to the RCP. There is an advantage in that all boards in the base station system can be checked efficiently.

Claims (2)

A method for checking board fault status in a wireless subscriber network base station system having an ACSU, CCU, UCC, HPA, TXFU, RCP, and RTU, Checking whether all of the remaining boards except the ACSU are abnormal and determining whether at least one board is abnormal; Detecting a transmission power of a final output stage, a gain of the HPA, and a gain of the UCC, respectively, in the RTU when the abnormal state is not detected in the one board; Calculating an output value of a current ACSU using the detected transmit power and gain values of HPA and UCC; Comparing the calculated current ACSU output value with a preset reference ACSU output value and determining whether the calculated ACSU output value is within a range of an output value of the preset reference ACSU; As a result of the determination, the ACSU is determined to be normal when the calculated value of the ACSU falls within the output range of the preset reference ACSU, and the ACSU is determined to be abnormal when the calculated value of the ACSU does not fall within the preset range of the reference ACSU. And reporting the result value to the RCP. A method for checking board abnormality status in a high frequency processing apparatus of a wireless subscriber network base station system. The method of claim 1, The output value of the ACSU is calculated using the following equation, characterized in that the board abnormal state check in the high frequency processing apparatus of the wireless subscriber network base station system. Where R is cable loss, insertion loss, antenna gain, and so on.