KR100820165B1 - System to monitor pim and there of pim monitor method - Google Patents

Abstract

A system and a method for monitoring PIM(Passive Inter-Modulation) signals are provided to rapidly solve deterioration in the reception of a mobile communication system and the occurrence of an abnormal state by suitably coping with PIM signals through constant monitoring using a PIM signal controller. A PIM signal monitoring system(100) comprises the first duplexer(10), the second duplexer(10-1), an LNA(Low Noise Amplifier)(20), a splitter(30), an Rx power detector(40), a signal extractor(50), a Tx power detector(60), and a PIM signal controller(70). The first duplexer, connected to a WCDMA transmission line(200), transmits and receives signals with an external antenna, and splits the transmitted/received signals. The second duplexer, connected to a WCDMA repeater(300), transmits and receives signals with the WCDMA repeater, and splits the transmitted/received signals. The LNA amplifies the Rx signals split from the first duplexer. The splitter splits the amplified signals. The Rx power detector detects the RF signal levels of the signals split from the splitter. The signal extractor extracts WiBro-band Tx frequency signals generated from a WiBro transmission line(400) and a WiBro repeater(500). The Tx power detector detects the RF signal levels of the extracted signals. The PIM signal controller compares and analyzes the RF signal levels detected through the Rx power detector and the Tx power detector and judges whether a PIM signal has been generated.

Description

PIM signal monitoring system and PIM signal monitoring method using same {System to monitor PIM and there of PIM monitor method}

1 is a block diagram showing a PIM signal monitoring system according to an embodiment of the present invention

2 is a diagram illustrating a PIM signal generation condition according to an embodiment of the present invention.

3 is a diagram illustrating a PIM signal monitoring method according to another embodiment of the present invention;

* Description of the main drawing codes *

10: first duplex 10-1: second duplex

20: low noise amplifier 30: distributor

40: received power detector 50: signal extractor

60: transmit power detector 70: PIM signal controller

100: PIM signal monitoring system

The present invention relates to a PIM signal monitoring system and a PIM signal monitoring method using the same, and more particularly, among the PIM signals generated when a WCDMA system and a WiBro system share a transmission line for the purpose of cost reduction of a base station or a repeater, a WiBro system. the PIM signal generated by combining the transmission signal of the transmission signal and the WCDMA system of the reflecting type by WCDMA reception bands for a PIM signal, which can degrade the reception performance of the WCDMA system, the PIM signals over a continuous monitoring using a PIM signal controller It is an object of the present invention to provide a PIM signal monitoring system and a PIM signal monitoring method that can appropriately cope with a decrease in reception performance and abnormality of a mobile communication system by appropriately responding.

The PIM signal in the communication system is generated when two transmission signals match. In case of using WCDMA and WiBro service on the same transmission line, RF signal must be matched to use one transmission line. In this case, transmission signals of two matching services are combined in a band combiner and transmitted to one transmission line. At this time, the generated PIM (Passive Inter-Modulation) signal.

As a technology of a method and apparatus for detecting a location of intermodulation distortion signal generation in a conventional high frequency component for communication, Korean Patent Publication No. 10-2002-0039409 combines and outputs a high frequency signal of two different bands amplified to a predetermined size. Connected to an antenna end of the coupling means and the coupling means, the intermodulation distortion signal source generation level adjusting means for adjusting the generation level of the intermodulation distortion signal source and the intermodulation distortion signal source generation level adjusting means being connected to one side of the A means for exhausting energy at the end load by receiving a null point measuring means for measuring a null point phenomenon and an intermodulated distortion signal passing through the null point measuring means, and being connected to a receiving end of the coupling means to generate the intermodulated distortion signal source The intermodulation distortion signal generated between the level adjusting means and the energy exhausting means Technology was made of the intermodulation distortion signal detection means for detecting a location signal generation.

However, in the related art, when matching with two or more transmission signals having a relatively high output by combining transmission / reception signals of a base station or a repeater, the PIM signal, which is a characteristic generated by the nonlinear medium characteristic of the passive element, is used for a specific service. There is a problem in that the reception performance of a particular service is deteriorated because unwanted waves or noise are generated in the reception frequency band and formed on the reception path of the specific service.

In addition, when the PIM signal generated in the transmission direction is formed in the direction of the reception signal due to the reflection characteristic of the RF device, there is a problem of substantial performance deterioration, and a PIM signal having a small level in the reception path processed as a weak signal input occurs. If there is a problem that has a very large impact on the mobile communication system.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is that the characteristics of the output PIM signal is important when matching outputs having different frequency bands through one device, but the PIM signal reflected in the input direction is important. PIM signal can be affected by the direct change in the mobile communication system or due to the change of environment over time, which can affect the mobile communication system. The purpose of the present invention is to provide a PIM signal monitoring system that can appropriately cope with a decrease in reception performance and abnormality of a mobile communication system.

In order to achieve the above object, a PIM signal monitoring system according to an embodiment of the present invention is connected to the WCDMA transmission line in a mobile communication system including a WCDMA transmission line, a WCDMA repeater, a WiBro transmission line, and a WiBro repeater. A signal duplexed in the first duplex and the first duplex connected to the first duplex and the WCDMA repeater for transmitting and receiving a signal, and transmitting and receiving a signal to and from the WCDMA repeater, and branching the transmitted and received signal. A low noise amplifier for amplifying the signal, a splitter for branching the amplified signal from the low noise amplifier, a reception power detector for detecting the RF signal level of the signal branched from the splitter, power of the WiBro band generated from the WiBro transmission line and the WiBro repeater W generated by the detector, the WiBro transmission line, and the WiBro repeater Comparing, determining and comparing a signal extractor for extracting a transmission frequency signal of an iBro band and a transmit power detector for detecting an RF signal level of the signal extracted from the signal extractor, and an RF signal level detected by the receive power detector and the transmit power detector It is characterized by consisting of a PIM signal controller to determine whether the PIM signal generation by analyzing.

According to an embodiment of the present invention, the PIM signal controller may generate an alarm sound when a PIM signal is generated.

According to an embodiment of the present invention, the first duplex is characterized in that the reception signal received from an external antenna passes through the RF level monitoring and reception path.

According to an embodiment of the present invention, the second duplex is characterized in that the transmission signal transmitted to the transmission antenna passes without any processing.

According to another aspect of the present invention, there is provided a PIM signal monitoring method including a first step of setting a PIM determination level and a PIM alarm generation condition, a second step of branching a WiBro transmission path, and measuring a WiBro transmission signal level and the WiBro transmission signal. A third step of checking a section in which a WiBro transmission signal exists and a time without a signal based on the measured result value of the level; and a fourth step of measuring a WCDMA reception signal level in a section in which the WiBro transmission signal exists; A fifth step of measuring a WCDMA reception signal level in a time period without a WiBro signal and a sixth step of calculating a difference between the WCDMA reception signal level and a WCDMA reception signal level in a time period without a WiBro signal in a period where the WiBro transmission signal is present; And a seventh step of determining whether the value of the calculated signal level satisfies the PIM determination level set in the first step and the PIM determination level. Eighth step of accumulating the value of the PIM determination level, if satisfied, the ninth step of determining whether the value of the accumulated PIM determination level satisfies the PIM alarm generation condition set in the first step and the PIM alarm generation And a tenth step of generating an alarm when the condition is satisfied.

According to another embodiment of the present invention, when the PIM determination level of the seventh step is not satisfied, an eleventh step of initializing the value of the signal level calculated in the sixth step is further performed.

According to another embodiment of the present invention, if the PIM alarm occurrence condition is not satisfied in the ninth step, the fourth step is performed.

According to another embodiment of the present invention, a first step of setting a PIM determination level and a PIM alarm generation condition and a second step of branching a WiBro transmission path to measure a WiBro transmission signal level and measuring the WiBro transmission signal level A third step of checking a section in which a WiBro transmission signal exists and a time without a signal based on the result value, and a fourth step of measuring a WCDMA reception signal level in a section in which the WiBro transmission signal exists and the WiBro signal free A fifth step of measuring a WCDMA reception signal level in a time zone and a sixth step of calculating a difference between the WCDMA reception signal level and a WCDMA reception signal level in a time zone in which there is no WiBro signal in a period where the WiBro transmission signal is present; The PIM determination level of the seventh step and the seventh step of determining whether the value of the signal level satisfies the PIM determination level set in the first step An eighth step of accumulating the value of the PIM determination level when the eleventh step of initializing the value of the signal level calculated in the sixth step and the PIM determination level of the seventh step is satisfied, and the accumulation; And a tenth step of determining whether a value of the determined PIM determination level satisfies the PIM alarm generation condition set in the first step, and a tenth step of generating an alarm when the PIM alarm generation condition is satisfied.

According to another embodiment of the present invention, the fourth step is performed when the PIM alarm generation condition is not satisfied in the ninth step.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a block diagram showing a PIM signal monitoring system according to the present invention, in the mobile communication system consisting of a WCDMA transmission line 200, WCDMA repeater 300, WiBro transmission line 400 and WiBro repeater 500 It is connected to the WCDMA transmission line 200 and transmits and receives a signal with an external antenna, and is connected to the first duplex 10 and the WCDMA repeater 300 for branching the transmitted and received signal to the signal with the WCDMA repeater 300 Signals amplified by the low noise amplifier 20 and the low noise amplifier 20 which transmit and receive and amplify the second duplex 10-1 and the received signal branched from the first duplex 10 to branch the transmitted and received signals. Of the WiBro band generated by the splitter 30 and the received power detector 40 and the WiBro transmission line 400 and the WiBro repeater 500 to detect the RF signal level of the signal branched from the splitter 30. Transmit frequency signal Transmitted power detector 60 for detecting the signal extractor 50 to extract and the RF signal level of the signal extracted from the signal extractor 50 and detected by the received power detector 40 and the transmit power detector 60 The PIM signal controller 70 compares, determines, and analyzes RF signal levels to determine whether PIM signals are generated.

In more detail, the first duplex 10 is connected to the WCDMA transmission line 200 to branch into a transmission signal and a reception signal, and the second duplex 10-1 is connected to the WCDMA repeater 300. Branch into a transmission signal and a reception signal.

In addition, the second duplex 10-1 formed in the WCDMA repeater 300 passes the transmission signal transmitted to the transmission antenna without any processing, and the first duplex 10 formed in the WCDMA transmission line 200. Branches the received signal from the external antenna for the purpose of monitoring the reception level and passing the reception path.

The low noise amplifier 20 is formed to compensate for the loss of the received signal formed by branching the signal in the first duplex 10 formed on the WCDMA transmission line.

The splitter 30 branches the signal to the received power detector 40 to detect the second duplex 10-1 and the PIM signal level formed in the WCDMA repeater 300.

The received power detector 40 measures the WCDMA received signal level by the signal branched from the divider 30 and transmits it to the PIM signal controller 70.

The signal extractor 50 is formed between the WiBro transmission line 400 and the WiBro repeater 500 to extract a WiBro frequency transmission band signal.

The transmission power detector 60 measures the signal level of the WiBro signal coupled by the signal combiner 50 and transmits the signal level to the PIM signal controller 70.

The PIM signal controller 70 receives the signal levels measured by the reception power detector 40 and the transmission power detector 60 to compare, determine, and analyze whether PIM signals are generated by an initial setting. Generates an alarm sound.

In particular, the PIM signal controller 70 may determine whether the PIM signal is generated by monitoring the change in the WCDMA Rx reception level in the period with the WiBro transmission signal and the time period without the WiBro transmission signal.

2 is a diagram illustrating a PIM signal generation condition according to an embodiment of the present invention, in which a WCDMA system uses a frequency division diplex (FDD) scheme to simultaneously transmit and receive signals in a WCDMA system; The strength of the signal that can be emitted and transmitted is always transmitted by minimizing the overhead channel value, which is basically transmitted by WCDMA service, but in case of WiBro system, TDD (Time Division Diplex) method is used. In this case, the transmitting and receiving signals cannot be emitted at the same time, and the signal transmission and the signal reception are divided in time and intersect. That is, the transmission section is not continuous, and the transmission signal must be stopped periodically to receive the signal.

Therefore, there is a section in which only a WCDMA transmission signal exists and a section in which a WCDMA transmission signal and a WiBro transmission signal exist at the same time, which means that the PIM signal generation section is limited to the WiBro transmission section, and the PIM in the matching line of the mobile communication system If the signal is excessively generated, the PIM signal may be detected as an RF signal in the WCDMA reception band, and the PIM signal may not be detected as the WCDMA reception band since no PIM signal is generated in the section without the WiBro transmission signal.

FIG. 3 is a diagram illustrating a PIM signal monitoring method according to another embodiment of the present invention, wherein a first step (S10) of setting a PIM determination level and a PIM alarm generation condition and a WiBro transmission path are performed to branch out a WiBro transmission signal level. The second step (S20) of measuring and the third step (S30) of checking the period in which there is a WiBro transmission signal and the time without a signal based on the measured result value of the WiBro transmission signal level and the WiBro transmission signal The fourth step (S40) of measuring the WCDMA reception signal level in the period in which there is a step; the fifth step (S50) of measuring the WCDMA reception signal level in the time zone where the WiBro signal is absent; and the WCDMA in the section in which the WiBro transmission signal exists The sixth step (S60) of calculating a difference between the WCDMA received signal level and the value of the calculated signal level at the time when there is no reception signal level and the WiBro signal, the PIM determination level set in the first step (S10). The seventh step (S70) of judging whether the content is satisfied and the eighth step (S80) of accumulating the value of the PIM determination level when the PIM determination level is satisfied, and the accumulated value of the PIM determination level is the first step ( A ninth step S90 of determining whether a PIM alarm occurrence condition set in S10 is satisfied and a tenth step S100 of generating an alarm when the PIM alarm occurrence condition is satisfied.

In addition, when the PIM determination level of the seventh step S70 is not satisfied, an eleventh step S110 of initializing the value of the signal level calculated in the sixth step S60 is further performed. If the PIM alarm generation condition is not satisfied in step S90, the fourth step S40 is performed.

More specifically, the first step (S10) is a step of setting the PIM determination level and the PIM alarm generation condition according to the environment and situation in which the mobile communication system is used. For example, if the setting condition is 24 hours, the WCDMA system In case of no signal is generated by frequency division duplex communication method and time division duplex communication method of WiBro system, if no signal is generated, it goes down to the initial reference level and it can be confirmed that it is normal. If the signal does not fall below the initially set reference level, the PIM signal is considered to have occurred.

Accordingly, the setting of the PIM determination level and the PIM alarm generation condition in the first step S10 is an initial setting so that the user can monitor the generation of the PIM signal by setting it according to the environment and situation in which the user is used.

The second step (S20) measures the WiBro transmission signal level by branching the WiBro transmission path so as to determine whether the PIM signal is generated, and based on the measured result value of the WiBro transmission signal level in the third step (S30). Check the section where the WiBro transmission signal exists and the time without signal.

The fourth step (S40) measures the WCDMA reception signal level in the period in which the WiBro transmission signal is present, and the fifth step (S50) measures the WCDMA reception signal level in the absence of the WiBro signal to cause PIM signal generation. To check.

The sixth step S60 receives the signal levels measured in the fourth and fifth steps S40 and S50 to receive the WCDMA reception signal level and the WCDMA signal in the absence of the WiBro signal in the period in which the WiBro transmission signal is present. The difference in the signal level is calculated and transmitted to the seventh step S70.

In the seventh step S70, the signal transmitted in the sixth step S60 is received and it is determined whether the PIM determination level initially set in the first step S10 is satisfied. If the calculated value of is higher than the initially set value, the eighth step S80 is performed. If the calculated value of the sixth step S60 is lower than the initially set value, the eleventh step S110 is performed. .

The eleventh step S110 initializes the value calculated in the sixth step S60, and after initializing for more accurate measurement, performs the fourth step S40 to detect and measure a signal in real time. Can be.

The eighth step S80 accumulates the value of the PIM determination level when the PIM determination level of the seventh step S70 is satisfied, and the ninth step S90 is performed in the eighth step S80. When the value of the accumulated PIM determination level is higher than the PIM alarm occurrence condition set in the first step S10, the tenth step S100 is performed, and the value of the accumulated PIM determination level is determined in the eighth step S80. If it is lower than the PIM alarm occurrence condition set in the first step S10, the fourth step S40 is performed.

The tenth step S100 generates an alarm when the PIM alarm generation condition of the ninth step S90 is satisfied.

The present invention has been described in detail so far, but the embodiments mentioned in the process are only illustrative and are not intended to be limiting, and the present invention is provided by the following claims and the technical spirit and field of the present invention. Within the scope not departing from the scope of the present invention, changes in the components that can be coped evenly will fall within the scope of the present invention.

 As described above, in the present invention, when matching outputs having different frequency bands through one device, the PIM signal is reflected by the input direction or when the PIM signal is generated due to changes in time and environment. Since it may affect the system, it is effective to solve the problem of degradation of reception performance and abnormality of the mobile communication system by appropriately responding to the PIM signal through constant monitoring using the PIM signal controller.

Claims (9)

In the mobile communication system consisting of a WCDMA transmission line and a WCDMA repeater, a WiBro transmission line and a WiBro repeater, A first duplex connected to the WCDMA transmission line to transmit and receive a signal with an external antenna, and branch the transmitted and received signal; A second duplex connected to the WCDMA repeater to transmit and receive signals to and from the WCDMA repeater, and branch the transmitted and received signals; A low noise amplifier for amplifying the received signal branched from the first duplex; A divider for branching the signal amplified by the low noise amplifier; A reception power detector for detecting an RF signal level of a signal branched from the splitter; WiBro band generated from the WiBro transmission line and WiBro repeater A signal extractor for extracting a transmission frequency signal; A transmission power detector for detecting an RF signal level of the signal extracted from the signal extractor; And And a PIM signal controller which compares, determines, and analyzes an RF signal level detected by the reception power detector and the transmission power detector to determine whether a PIM signal is generated. The PIM signal monitoring system of claim 1, wherein the PIM signal controller generates an alarm when a PIM signal is generated. The PIM signal monitoring system according to claim 1, wherein the first duplex passes a received signal received from an external antenna to an RF level monitoring and reception path. 4. The PIM signal monitoring system according to claim 1 or 3, wherein the second duplex transmits the branched transmission signal to a transmission antenna. A first step of setting a PIM determination level and a PIM alarm generation condition; Dividing the WiBro transmission path and measuring a WiBro transmission signal level; A third step of checking a section in which a WiBro transmission signal exists and a time without a signal based on the measured result value of the WiBro transmission signal level; A fourth step of measuring a WCDMA reception signal level in a section in which the WiBro transmission signal is present; A fifth step of measuring a WCDMA received signal level in a time when there is no WiBro signal; A sixth step of calculating a difference between the WCDMA reception signal level in the period where the WiBro transmission signal is present and the WCDMA reception signal level in the absence of the WiBro signal; A seventh step of determining whether the value of the calculated signal level satisfies the PIM determination level set in the first step; An eighth step of accumulating the value of the PIM determination level when the PIM determination level is satisfied; A ninth step of determining whether a value of the accumulated PIM determination level satisfies a PIM alarm occurrence condition set in the first step; And And a tenth step of generating an alarm when the PIM alarm generation condition is satisfied. 6. The PIM signal monitoring method according to claim 5, further comprising the step of initializing a value of the signal level calculated in the sixth step if the PIM determination level of the seventh step is not satisfied. The PIM signal monitoring method according to claim 5, wherein the fourth to eighth steps are performed again when the PIM alarm generation condition is not satisfied in the ninth step. A first step of setting a PIM determination level and a PIM alarm generation condition; Dividing the WiBro transmission path and measuring a WiBro transmission signal level; A third step of checking a section in which a WiBro transmission signal exists and a time without a signal based on the measured result value of the WiBro transmission signal level; A fourth step of measuring a WCDMA reception signal level in a section in which the WiBro transmission signal is present; A fifth step of measuring a WCDMA received signal level in a time when there is no WiBro signal; A sixth step of calculating a difference between the WCDMA reception signal level in the period where the WiBro transmission signal is present and the WCDMA reception signal level in the absence of the WiBro signal; A seventh step of determining whether the value of the calculated signal level satisfies the PIM determination level set in the first step; An eleventh step of initializing a value of the signal level calculated in the sixth step if the PIM determination level of the seventh step is not satisfied; An eighth step of accumulating the values of the PIM decision level when the PIM decision level of the seventh step is satisfied; A ninth step of determining whether a value of the accumulated PIM determination level satisfies a PIM alarm occurrence condition set in the first step; And And a tenth step of generating an alarm when the PIM alarm generation condition is satisfied. The PIM signal according to claim 8, wherein the fourth to seventh steps, the eleventh steps, and the eighth steps are performed again when the PIM alarm generation condition is not satisfied in the ninth step. Surveillance Method.

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