Abstract: A method for processing missing values of network log data and a method for classifying communication defect root cause thereof, includes utilizing machine learning or deep learning techniques to analyze the root causes of various defects occurring in a network environment while obtaining a complete dataset by obtaining appropriate imputation values according to the characteristics of the parameters in which the missing values exist.

Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.

Abstract: A method and an apparatus for calibrating an array path of a beam forming test equipment for a base station, includes enabling a beam forming-related interlocking test of a base station and a test equipment by compensating for distortion of the beam forming characteristics of the base station incidentally caused by the connection between the base station and the test equipment by using a specific signal transmitted from the base station, when test equipment such as a channel simulator is used to test beam forming of a base station.

Abstract: A radio station test system using a portable spectrum analyzer allows the portable spectrum analyzer to directly control the transmission of various base station signals so that various signal analysis may be performed more quickly and conveniently in an OTA (Over The Air) measurement environment. Further, a radio station test system using a portable spectrum analyzer includes a base station outputting base station signals, a base station control center that controls base station signals by various base station parameters, and a portable spectrum analyzer that receives base station signals and performs a radio station test, which includes a portable spectrum analyzer having: a signal input terminal; a RF processing part; a digital processing part; a display part; a base station parameter setting part; an encoding part; and a communication part.

Abstract: A method for evaluating video quality based on a non-reference video to evaluate the quality of a received video using artificial intelligence composed of convolutional neural networks (CNN) and recurrent neural networks (RNN) capable of setting a learning range, includes: (a) extracting RGB values for one frame of a video; (b) obtaining an output by providing the extracted RGB values to CNN No. 1; (c) obtaining an output by providing the extracted RGB values n times to a CNN; (d) repeating (a) to (c) for all frames and merging outputs of all CNNs; (e) obtaining the output of the RNN with the time dimension reduced to 1 after passing the merged output value to the RNN; and (f) after applying a regression algorithm to the final output of the RNN, predicting this value as video quality value.

Abstract: A small cell synchronization system uses multiple synchronization sources to obtain maximum performance and stability by utilizing all of the plurality of synchronization sources in a multiple small cell system having two or more different mobile communication small cells as one system and a control method thereof. The small cell synchronization system includes: an oscillator providing a system clock signal of a predetermined frequency; and a synchronization management module that collectively manages multiple synchronization sources, and determines the ‘synchronized PPS’ according to a result of comparing the ‘synchronized PPS’ with the PPS for each synchronization source using the system clock and provides it to each small cell along with the system clock.

Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.

Abstract: The present disclosure relates to a shield box for testing a mobile telecommunication terminal in which an increase in temperature in a shield box is prevented in performing various tests on a mobile telecommunication terminal having multiple antennas in an Over The Air (OTA) method to perform a stable test. The shield box for testing a communication terminal of the present disclosure includes a shield box main body made of metal, having a jig entrance formed on the front side, and equipped with a vent which a plurality of vent holes of 1 to 10 mm in size are formed on the upper and rear sides, respectively; a test jig assembly installed to be able to enter and exit through the jig entrance while mounting a PCB for non-contact wireless connection in which a plurality of non-contact wireless connection parts that are wirelessly connected to a mobile telecommunication terminal and transmit and receive signals are arranged; and a ventilation fan mounted on the upper vent or the rear vent.

Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.

Abstract: Provided is a method of performing network listening (NL) for a radio unit (RU) in a Cloud-Radio Access Network (C-RAN) structure base station in which a certain RU distinguishes and automatically detects signals of neighboring RUs through NL in a C-RAN structure base station to thereby enable optimization and automation of configuration setting of multiple cells and multiple RUs.

Abstract: Provided is a method of performing network listening (NL) for a radio unit (RU) in a Cloud-Radio Access Network (C-RAN) structure base station in which a certain RU distinguishes and automatically detects signals of neighboring RUs through NL in a C-RAN structure base station to thereby enable optimization and automation of configuration setting of multiple cells and multiple RUs.

Abstract: Provided is a radio access network system in which a master unit compresses control management data to be allocated to a sub-channel of a public air interface (CPRI), and transmits the compressed control management data to a radio unit through a sub-channel of a public air interface, and the radio unit receives the compressed control management data through a sub-channel of a public air interface, and restores the compressed control management data.

Abstract: Provided is a radio access network system in which a master unit compresses control management data to be allocated to a sub-channel of a public air interface (CPRI), and transmits the compressed control management data to a radio unit through a sub-channel of a public air interface, and the radio unit receives the compressed control management data through a sub-channel of a public air interface, and restores the compressed control management data.

Abstract: A spectrum analyzer having a memory function to adopt a digital-data-based frequency sweep scheme while achieving performance comparable to performance of a high-speed FFT spectrum analyzer, and a method of controlling the spectrum analyzer, in which the spectrum analyzer includes: an ADC for converting a BWP signal, which is at least one analog unit frequency band signal, into a digital data sample at a predetermined sample rate according to a span set by a user; a digital sweep part for sweeping the data sample passed through the ADC while digitally decimating the data sample through a decimation processing block having a two-stage cascaded structure, and processing the swept data sample to increase a frequency sweep speed; and a control unit for controlling the digital sweep part according to various items input, set, and selected by the user to perform spectrum analysis and output a spectrum analysis result.

Abstract: The present invention relates to a method of automatically controlling the volume level of communication speech for Mean Opinion Score (MOS) measurement, which, before evaluating the quality of communication speech using a MOS measurement method, automatically controls the volume level of actual communication speech to a predetermined optimal level, thus improving the reliability of MOS values.

Abstract: Disclosed herein are an apparatus and method for measuring quality of an image received via a communication network. The apparatus includes an interface unit, a codec unit, a test image detection unit, and a Mean Opinion Score (MOS) measurement unit. The interface unit receives an image, including a start synchronization image and a test image via a communication network. The codec unit decodes the received image into a color signal. The test image detection unit detects any one value of brightness, saturation and hue information of the color signal input from the codec unit, calculates an average value for each frame, and detects the test image from the received image based on the calculated average value. The MOS measurement unit synchronizes the test image with a corresponding reference image, compares the quality of the test image with the quality of the reference image, calculates an MOS value based on the results of the comparison, and outputs the MOS value.

Abstract: The present invention relates, in general, to a method for remotely logging diagnostic monitoring message data on a mobile telecommunication network and, more particularly, to a method for remotely logging diagnostic monitoring message data on a mobile telecommunication network, which, in measuring equipment for diagnosing abnormal service in the mobile telecommunication network, is capable of securely logging the diagnostic monitoring message data of a mobile telecommunication terminal to a remote server while minimizing the load on the mobile telecommunication network.

Abstract: The present invention relates to a method of automatically controlling the volume level of communication speech for Mean Opinion Score (MOS) measurement, which, before evaluating the quality of communication speech using a MOS measurement method, automatically controls the volume level of actual communication speech to a predetermined optimal level, thus improving the reliability of MOS values.

Abstract: Disclosed herein are an apparatus and method for measuring quality of an image received via a communication network. The apparatus includes an interface unit, a codec unit, a test image detection unit, and a Mean Opinion Score (MOS) measurement unit. The interface unit receives an image, including a start synchronization image and a test image via a communication network. The codec unit decodes the received image into a color signal. The test image detection unit detects any one value of brightness, saturation and hue information of the color signal input from the codec unit, calculates an average value for each frame, and detects the test image from the received image based on the calculated average value. The MOS measurement unit synchronizes the test image with a corresponding reference image, compares the quality of the test image with the quality of the reference image, calculates an MOS value based on the results of the comparison, and outputs the MOS value.