WO2014185657A1 - Method and apparatus for monitoring radio signal in cloud-based mobile radio access network - Google Patents

Abstract

Disclosed are a method and an apparatus for monitoring a radio signal in a cloud-based mobile radio access network. Provided are the method and the apparatus for monitoring a radio signal in a cloud-based mobile radio access network, wherein a separate base station (relay station) includes a base-band unit (BBU) and a remote radio unit (RRU) in a cloud-based radio network, and a digital optical signal is directly branched in an open radio interface between the BBU and the RRU so as to use the same to monitor the radio signal or to analyze performance.

Description

Method and apparatus for monitoring wireless signal in cloud mobile wireless access network

The present embodiment relates to a wireless signal monitoring method and apparatus in a cloud mobile wireless access network.

The contents described below merely provide background information related to this embodiment and do not constitute a prior art.

As a technique for conventional wireless signal monitoring and performance analysis, a method of coupling a radio signal from an RF (Radio Frequency) unit / IF (Intermediate Frequency) unit of an integrated base station / relay station to use a coaxial cable or the like It became. The conventional radio signal monitoring technology has to undergo a conversion process of down-converting the RF signal to an intermediate frequency and then converting the signal into a digital signal.

Recently, as mobile communication evolves to the fourth generation, it is evolving into a cloud-based Radio Access Network (RAN) environment. A typical integrated base station has been developed into a separate base station by being divided into a baseband unit (BBU) and a remote radio unit (RRU). The fronthaul between the baseband unit (BBU) and the remote radio unit (RRU) is connected by an open air interface. Since the base band unit (BBU) and the remote radio unit (RRU) transmit digital optical signals using an open air interface, the conventional radio signal monitoring apparatus cannot be used.

In order to monitor radio signals in cloud-based RAN environment, it is necessary to monitor radio signals by coupling RF signals in all areas where remote radio units (RRUs) including RF signal processing units are installed. There is a growing problem. In addition, in the conventional method, since the RF signal must be input, only the forward radio signal monitoring is possible, and there is a problem in that it is impossible to monitor the radio signal in the reverse direction. In other words, since the radio signal of the terminal must be converted into a digital optical signal and then transmitted to the baseband unit (BBU), the remote radio unit (RRU) cannot monitor the radio signal in the reverse direction.

In the present embodiment, a separate base station (relay station) is implemented as a base-band unit (BBU) and a remote radio unit (RRU) in a cloud-based wireless network, and a baseband unit (BBU) and a remote An object of the present invention is to provide a wireless signal monitoring method and apparatus in a cloud mobile wireless access network which intends to directly branch digital digital signals in an open air interface between radio units (RRUs) for use in wireless signal monitoring or performance analysis.

According to an aspect of the present embodiment, the optical splitter for splitting the optical signal input from the optical network; A photoelectric conversion unit converting the optical signal into an electrical signal; Frame realignment for detecting a synchronous clock and a frame synchronous signal from a frame, which is a data unit having a digital structure of the electrical signal, and outputting reframed data to a time point at which data is loaded in the frame by the frame synchronous signal. part; An extraction unit configured to extract a sampling rate and an in-phase quadrature (IQ) data string group, the sampling rate of the reframed data during a preset unit time; And a signal processor configured to generate signal processing data obtained by digitally processing the sampling rate and the IQ data string group, respectively.

According to another aspect of the present embodiment, the photoelectric conversion unit for converting the optical signal input from the optical line sharing device using wavelength division multiplexing (WDM) into an electrical signal; A frame rearranging unit which detects a synchronous clock and a frame synchronous signal from a frame which is a data unit having a digital structure of the electric signal, and outputs reframed data to a time point at which data is loaded into the frame by the frame synchronous signal; An extraction unit configured to extract a sampling rate and an IQ data string group, which is a sampling frequency of the reframed data during a preset unit time; And a signal processor configured to generate signal processing data obtained by digitally processing the sampling rate and the IQ data string group, respectively.

According to another aspect of the present embodiment, a method for analyzing a radio signal by a radio signal monitoring apparatus, comprising: an optical branching process for branching an optical signal input from an optical network; A photoelectric conversion process of converting the optical signal into an electrical signal; A frame realignment process of detecting a synchronous clock and a frame synchronous signal from a frame which is a data unit having a digital structure of the electrical signal, and outputting reframed data to a time point at which data is loaded into the frame by the frame synchronous signal; An extraction process of extracting a sampling rate and an IQ data sequence group, which is a sampling frequency during the predetermined unit time of the reframed data; And a signal processing step of generating signal processing data obtained by digitally processing the sampling rate and the IQ data sequence group, respectively.

According to another aspect of the present embodiment, a method for analyzing a wireless signal by a wireless signal monitoring device, the method comprising: a photoelectric conversion process for converting an optical signal input from the optical line sharing device into an electrical signal; A frame realignment process of detecting a synchronous clock and a frame synchronous signal from a frame which is a data unit having a digital structure of the electrical signal, and outputting reframed data to a time point at which data is loaded into the frame by the frame synchronous signal; An extraction process of extracting a sampling rate and an IQ data sequence group, which is a sampling frequency during the predetermined unit time of the reframed data; And a signal processing step of generating signal processing data obtained by digitally processing the sampling rate and the IQ data sequence group, respectively.

As described above, according to the present embodiment, a separate base station (relay station) is configured as a baseband unit (BBU) and a remote radio unit (RRU) in a cloud-based wireless network, and the baseband unit (BBU) and a remote radio unit are configured. Direct branching of digital optical signals on open air interfaces between (RRUs) can be used for radio signal monitoring or performance analysis.

According to the present embodiment, in a cloud-based wireless network, the baseband unit (BBU) is centralized and connected to each remote radio unit (RRU) by an optical cable. The wireless monitoring apparatus according to the present embodiment branches the digital optical signal from the optical cable between the baseband unit (BBU) and the remote wireless unit (RRU) when transmitting digital data to the remote wireless unit (RRU) using an open wireless interface. It does not affect the mobile communication service by passing the radio access transmission / reception signal as it is. The wireless monitoring apparatus according to the present exemplary embodiment has an effect of enabling forward and reverse wireless signal monitoring and performance analysis by displaying an input digital optical signal as an RF signal. Unlike the conventional monitoring device, the wireless monitoring device according to the present embodiment does not require a part for converting an RF signal into a digital signal, thereby reducing the cost.

According to this embodiment, the wireless monitoring apparatus can be installed in the centralized station where the baseband unit (BBU) is located to monitor all the lines of the open air interface, and it is possible to confirm the abnormality of the separate base station in advance. have. In addition, RF signal monitoring is unnecessary for a plurality of remote radio units (RRUs), and there is an effect of suppressing the use of additional devices in accordance with RF signal monitoring on the remote radio units (RRUs) and reducing maintenance costs.

In a reverse digital optical signal transmitted from a general remote radio unit (RRU), a terminal signal and an interference signal are transmitted together, thereby reducing base station reception. In addition, the interference signal reduces the service coverage and data throughput in the remote radio unit (RRU). Meanwhile, the wireless monitoring apparatus according to the present embodiment displays the RF spectrum in the digital optical signal, so that a separate base station / relay station operator can perform reverse wireless signal monitoring and performance analysis, thereby identifying a cause of a mobile communication service problem.

1 is a block diagram schematically showing a radio signal monitoring apparatus according to the present embodiment (first to third embodiments).

2 is a flowchart illustrating a radio signal analysis method according to the present embodiment (first to third embodiments).

3 is a diagram in which the apparatus for monitoring radio signals according to the first embodiment analyzes a radio access signal.

4 is a diagram in which a radio signal monitoring apparatus according to a second embodiment is applied to a distributed base station.

5 is a diagram illustrating a wireless signal monitoring apparatus according to a third embodiment applied to a wavelength division multiplexing (WDM) system for sharing optical paths.

6 is a block diagram showing a frame rearranging unit and an extracting unit according to the present embodiment (first to third embodiments).

Hereinafter, the present embodiment (first to third embodiments) will be described in detail with reference to the accompanying drawings.

1 is a block diagram schematically showing a radio signal monitoring apparatus according to the present embodiment (first to third embodiments).

The wireless signal monitoring device 100 according to the present embodiment (first to third embodiments) includes an optical branching unit 110, a photoelectric conversion unit 120, a frame rearranging unit 130, an extraction unit 140, and a signal processing unit. And 150. Components included in the wireless signal monitoring device 100 is not necessarily limited thereto.

The distributed base station employs remote technology to include baseband unit 102 and remote radio unit 104 as core modules. The base band unit 102 is connected with a plurality of remote radio units 104. The base band unit 102 may include a virtual BS cluster and the like, and is connected to the remote wireless unit 104 by an optical line. The remote radio unit 104 provides a radio signal to the terminal and is connected to the baseband unit 102 via an optical line. The baseband unit 102 and the remote radio unit 104 are connected to one or more of an open radio interface, a common public radio interface (CPRI), an open base station architecture initiative (OBASI), and an open radio interface (ORI). Perform data communication.

The apparatus 100 for monitoring a radio signal illustrated in FIG. 1 basically refers to an apparatus operating in a distributed base station environment in a cloud-based Radio Access Network (RAN). The wireless signal monitoring apparatus 100 may be applied to a cloud-based RAN according to a first embodiment, or may be applied to a fronthaul of a distributed base station according to a second embodiment, or an optical path according to a third embodiment. Each may be applied to a wavelength division multiplexing (WDM) system for sharing.

When the radio signal monitoring apparatus 100 is applied to a cloud-based RAN according to the first embodiment, the baseband unit 102 and the remote radio unit 104 are connected by an open air interface, and the baseband unit 102 And an optical branch 110 between the remote radio unit 104. In addition, when the radio signal monitoring apparatus 100 is applied to the front hole of the distributed base station according to the second embodiment, the baseband unit 102 and the remote radio unit 104 are connected by an open air interface, and the baseband An optical branch 110 is installed between the unit 102 and the remote radio unit 104. In addition, when the wireless signal monitoring apparatus 100 according to the third embodiment is applied to a wavelength division multiplexing (WDM) system for sharing the optical path, the baseband unit 102 is a wavelength division multiplexing (WDM) for sharing the optical path Is connected to the system. The remote radio unit 104 is connected to a demultiplexing system for sharing the optical fiber, and the clock regeneration unit (and signal multiplexing) and the baseband unit 102 (or remote) of the wavelength division multiplexing (WDM) system for optical fiber sharing. The photoelectric conversion unit 120 is installed between the wireless units 104.

The optical branch unit 110 branches the optical signal input from the optical network. The optical splitter 110 is implemented as an optical tap for dividing an optical signal, and outputs the optical signal by dividing the optical signal according to a preset branching ratio. The optical branch 110 is installed between the baseband unit 102 and the remote radio unit 104 connected by an open air interface when applied to the cloud-based RAN according to the first embodiment. In addition, the optical branch 110 is installed between the baseband unit 102 and the remote radio unit 104 connected by the open air interface when applied to the front hole of the distributed base station according to the second embodiment. The optical branch 110 branches an optical signal between the baseband unit 102 and the remote radio unit 104 connected by one or more of the open air interfaces CPRI, OBASI and ORI. Here, CPRI refers to public air interface, OBSAI refers to open base station architecture, and ORI refers to open air interface. In addition, the optical branch unit 110 branches a plurality of optical signals in the front hole of the distributed base station.

The photoelectric converter 120 converts an optical signal into an electrical signal. The photoelectric conversion unit 120 serves as an interface, and converts an optical signal into an electrical signal or vice versa. The photoelectric converter 120 according to the third exemplary embodiment converts an optical signal input from the optical line sharing device into an electrical signal. When the photoelectric conversion unit 120 is applied to a wavelength division multiplexing (WDM) system for optical path sharing according to the third embodiment, the baseband unit 102 is connected to a wavelength division multiplexing (WDM) system for optical path sharing do. The remote radio unit 104 is connected to a demultiplexing system for sharing the optical fiber, and the clock regeneration unit (and signal multiplexing) and the baseband unit 102 (or remote) of the wavelength division multiplexing (WDM) system for optical fiber sharing. Installed between the wireless units 104.

The frame reordering unit 130 detects a sync clock and a frame sync signal from a frame, which is a data unit having a digital structure of an electric signal. The frame reordering unit 130 outputs the reframed data to a time point at which data is loaded in the frame by the frame synchronization signal. In the digital transmission system, information is bundled and transmitted using a frame having a certain period as a unit. Therefore, the frame reordering unit 130 detects a synchronous clock and a frame synchronous signal from the frame, and based on the frame synchronous signal, data is stored in the frame. Check the running point. The frame reordering unit 130 demultiplexes and outputs an electrical signal received from the photoelectric conversion unit 120, and extracts a receiving synchronous clock signal (synchronizing signal) whose frequency and phase substantially match the demultiplexed signal. In addition, the frame rearranging unit 130 outputs the reframed data based on the start point of the frame, checks the normality by processing the bits of the reframed data, and sets the loss state confirmed by the check result. To print. In addition, when the signal in the frame is multiple frequency allocation (FA) or multiple input multiple output (MIMO) data, the frame rearranging unit 130 separates and extracts the Tx data stream (Data Stream) in units of FA. To send. Here, MIMO means multiple input and output.

The extractor 140 extracts a sampling rate, which is a sampling number of the reframed data for a preset unit time, and extracts an in-phase quadrature (IQ) data string group. In other words, the extractor 140 extracts the sampling rate and the IQ data string group from the reframed data. The extractor 140 may then extract the start time or bit information of the IQ data. Here, I data refers to data composed of in-phase components, and Q data refers to data composed of quadrature-phase components. IQ data means data obtained by demodulating the reframed data into baseband to form I data consisting of in-phase components and Q data consisting of quadrature-phase components.

The extraction unit 140 distributes the IQ data to a plurality of groups by a predetermined channel and digitally converts the distributed IQ data for each group, and then optically transmits them to a device via an optical cable, or a signal for each group that is reversely optically transmitted from a plurality of devices. The reverse optical transmission may be performed to the frame reordering unit 130. In addition, the sampling rate defines the number of sampling times during the unit time (usually seconds) obtained from the continuous signal to produce a discrete signal. The extractor 140 according to the second exemplary embodiment separates the sampling data and the IQ data into two blocks, and then transmits the IQ data to the signal processor 150 to generate performance analysis data of the radio signal or digitalize the IQ data. It is sent to an analog converter (DAC) to be provided as an external analog signal.

The signal processor 150 generates signal processing data obtained by digitally processing the sampling rate and the IQ data. Here, the signal processor 150 means a digital signal processor (DSP). The signal processor 150 refers to an integrated circuit that enables a mechanical device to quickly process a digital signal. The signal processor 150 may be used for high-speed operation, voice coding for digitizing an analog signal, digital mobile communication, an answering machine and a video telephone, and multimedia. The monitoring unit 160 generates the RF spectrum analysis data or the RF performance analysis data using the signal processing data. Here, the monitoring unit 160 is preferably implemented as a separate device from the wireless signal monitoring device 100, but is not necessarily limited thereto, and may be implemented in a form included in the wireless signal monitoring device 100.

2 is a flowchart illustrating a radio signal analysis method according to the present embodiment (first to third embodiments).

The optical branch unit 110 of the wireless signal monitoring device 100 branches the optical signal input from the optical network (S210). In operation S210, the optical branching unit 110 of the wireless signal monitoring apparatus 100 is implemented as an optical tap for branching an optical signal, and outputs an optical signal by branching according to a preset branching ratio. In other words, when applied to the cloud-based RAN according to the first and second embodiments, the optical branch 110 is installed between the baseband unit 102 and the remote radio unit 104 connected by the open air interface. The optical branch 110 branches an optical signal between the baseband unit 102 and the remote wireless unit 104 connected by one or more of the open air interfaces CPRI, OBASI and ORI.

After step S210, the photoelectric converter 120 converts the optical signal into an electrical signal. The photoelectric converter 120 according to the third exemplary embodiment may convert the optical signal input from the optical line sharing device into an electrical signal.

The frame rearranging unit 130 of the wireless signal monitoring apparatus 100 detects a synchronous clock and a frame synchronous signal from a frame that is a data unit having a digital structure of an electric signal (S220). In operation S220, the digital transmission system bundles and transmits information using frames having a predetermined period as one unit, and thus, the frame realignment unit 130 may detect a synchronization clock and a frame synchronization signal from the frame.

The frame rearranging unit 130 of the wireless signal monitoring apparatus 100 outputs the reframed data to a time point at which data is loaded in the frame by the detected frame synchronization signal (S230). In step S230, the frame rearranging unit 130 of the wireless signal monitoring apparatus 100 checks a point where data is loaded in the frame based on the frame synchronization signal. The frame rearranging unit 130 of the wireless signal monitoring apparatus 100 demultiplexes and outputs an electrical signal received from the photoelectric conversion unit 120, and receives a synchronous clock signal having substantially the same frequency and phase as the demultiplexed signal. Extract the (synchronous signal). In addition, when the signal in the frame is multi-FA or MIMO data, the frame reordering unit 130 separates and transmits the Tx data stream in FA unit to the extraction unit 140.

The extraction unit 140 of the wireless signal monitoring apparatus 100 extracts the sampling rate, which is the number of times of sampling the reframed data for a preset unit time, and extracts the IQ data sequence group (S240). In other words, in step S240, the extraction unit 140 of the wireless signal monitoring apparatus 100 extracts the sampling rate and the IQ data from the reframed data. Thereafter, the extractor 140 of the apparatus 100 for monitoring wireless signals may extract start time or bit information of the IQ data. In operation S240, the extractor 140 of the apparatus 100 for monitoring wireless signals according to the second embodiment separates the sampling data and the IQ data into two blocks, and then transmits the IQ data to the signal processor 150 to transmit the radio signal. Performance analysis data is generated or IQ data is sent to a digital-to-analog converter (DAC) to be provided as an external analog signal.

The signal processor 150 of the wireless signal monitoring apparatus 100 generates signal processing data obtained by digitally processing the sampling rate and the IQ data, respectively (S250). The monitoring unit 160 of the wireless signal monitoring apparatus 100 generates RF spectrum analysis data using the signal processing data or generates RF performance analysis data (S260).

In FIG. 2, steps S210 to S260 are sequentially described. However, this is merely illustrative of the technical idea of the present embodiment, and a person having ordinary knowledge in the technical field to which the present embodiment belongs may perform the present embodiment. 2 may be modified and modified in various ways, such as by changing the order described in FIG. 2 or executing one or more steps of steps S210 to S260 in parallel without departing from the essential characteristics, and thus, FIG. It is not limited.

As described above, the wireless signal analysis method according to the present embodiment described in FIG. 2 may be implemented in a program and recorded in a computer-readable recording medium. The computer-readable recording medium having recorded thereon a program for implementing the radio signal analysis method according to the present embodiment includes all kinds of recording devices storing data that can be read by a computer system.

3 is a diagram in which the apparatus for monitoring radio signals according to the first embodiment analyzes a radio access signal.

A method of displaying an RF spectrum in a cloud-based wireless access signal using the wireless signal monitoring apparatus 100 is as follows. Here, in the cloud-based RAN, the baseband unit 102 and the remote radio unit 104 are connected by an open air interface, and the radio signal monitoring device 100 is connected between the baseband unit 102 and the remote radio unit 104. 'Optical Tap' that is the optical branch 110 of the is installed.

①. A digital optical signal is received from the open air interface (CPRI, OBASI, ORI) between the baseband unit 102 and the remote radio unit 104 at the 'optical tap', the optical branch 110 of the radio signal monitoring apparatus 100. Diverge.

②. The 'O / E converter', which is the photoelectric converter 120 of the wireless signal monitoring apparatus 100, converts the optical signal into an electric signal.

③. The frame realigner 130 of the wireless signal monitoring apparatus 100 detects a synchronous clock and a frame synchronous signal using an electric digital signal. In addition, when the wireless signal is a multi-FA or MIMO, the 'reframer' separates the multiple TX data data streams and sends a frame to the 'IQ Searcher', which is the extractor 140 of the wireless signal monitoring apparatus 100. send.

④. The extractor 140 of the wireless signal monitoring apparatus 100 extracts the sampling rate and the IQ data of the digitally modulated wireless signal.

⑤. The digital signal processor DSP, which is a signal processor 150 of the wireless signal monitoring apparatus 100, receives a sampling rate and IQ data from the 'IQ searcher' and then processes the digital signal. Thereafter, the monitoring unit 160 may provide a wireless signal performance analysis function that may be expressed in an RF spectrum, code domain power, error vector magnitude (EVM), or traffic analysis.

By using the above-described method, it is possible to provide a device for enabling radio signal monitoring and performance analysis to a separate base station and relay station operator, and the EMS (remote signal monitoring device 100) is installed remotely without going to the base station. Wireless signal can be checked using Element Management System) or Web.

4 is a diagram in which a radio signal monitoring apparatus according to a second embodiment is applied to a distributed base station.

The wireless signal monitoring or performance analysis method in the front hole of the distributed base station using the wireless signal monitoring apparatus 100 is as follows. Here, in the cloud-based RAN, the baseband unit 102 and the remote radio unit 104 are connected by an open air interface, and the radio signal monitoring device 100 is connected between the baseband unit 102 and the remote radio unit 104. 'Optical tap' which is the light splitting part 110 is installed.

①. A digital optical signal is received from the open air interface (CPRI, OBASI, ORI) between the baseband unit 102 and the remote radio unit 104 at the 'optical tap', the optical branch 110 of the radio signal monitoring apparatus 100. Diverge.

②. The 'O / E converter', which is the photoelectric converter 120 of the wireless signal monitoring apparatus 100, converts the optical signal into an electric signal.

③. The frame realigner 130 of the wireless signal monitoring apparatus 100 detects a synchronous clock and a frame synchronous signal using an electric digital signal. In addition, when the wireless signal is a multi-FA or MIMO, the 'reframer' transmits a signal to the 'IQ searcher' which is the extractor 140 of the wireless signal monitoring apparatus 100 by separating the multiple TX data data streams. When applied to a distributed base station, the 'reframer' detects a sync clock and a frame sync signal from a digital signal.

④. The extractor 140 of the wireless signal monitoring apparatus 100 extracts the digitally modulated sampling rate and the IQ data of the digitally modulated radio signal. When the 'IQ searcher' is applied to the distributed base station, the sampling rate and the IQ data of the digitally modulated radio signal are extracted and separated into two blocks. After the first operation, the extraction unit 140 of the wireless signal monitoring device 100, 'IQ searcher' is a digital signal processing unit (DSP), the baseband IQ data signal processing unit 150 of the wireless signal monitoring device 100 And then signal processing and representation and performance analysis in the RF spectrum. In a second operation, the extractor 140 of the wireless signal monitoring apparatus 100 transmits the baseband IQ data to the digital analog converter (DAC), and uses the IQ modulator to perform RF and It converts to an IF signal and provides an analog signal externally so that it can be connected to a wireless signal analysis instrument such as a spectrum analyzer.

⑤. The digital signal processor DSP, the signal processor 150 of the wireless signal monitoring apparatus 100, receives the sampling rate and the IQ data from the IQ searcher and processes the digital signal. Then, the monitoring unit 160 provides a radio signal performance analysis function that can be expressed in the RF spectrum or code domain power, EVM, or traffic analysis.

By using the above-described method, a separate base station and relay station operator can be provided with a device that enables radio signal monitoring and performance analysis, and the EMS or remotely without going to the base station where the wireless signal monitoring device 100 is installed You can check the wireless signal using the web.

5 is a diagram illustrating a wireless signal monitoring apparatus according to a third embodiment applied to a wavelength division multiplexing (WDM) system for sharing optical paths.

The wireless signal monitoring or performance analysis method in the wavelength division multiplexing (WDM) system for sharing the optical path using the wireless signal monitoring apparatus 100 is as follows. The baseband unit 102 is connected to a wavelength division multiplexing (WDM) system for optical fiber sharing, and the remote wireless unit 104 is connected to a 'demultiplexing system for optical fiber sharing'.

The WDM system for sharing optical paths and the demultiplexing system for sharing optical paths are connected by an open wireless interface, and the clock regeneration unit of the WDM system for optical fiber sharing is connected. Between the (and signal multiplexing) and the baseband unit 102 (or the remote radio unit 104), an 'O / E conversion unit', which is a photoelectric conversion unit 120 of the radio signal monitoring apparatus 100, is provided.

①. In the 'O / E converter', the photoelectric converter 120 of the wireless signal monitoring apparatus 100, an optical signal input from a wavelength division multiplexing system (WDM) system for sharing the optical path Convert to a signal. Wavelength converting or digital signal mass multiplexing unit of the open wireless access network digital optical signal of the baseband unit 102 connected to the central office terminal (COT) of the wavelength division multiplexing (WDM) system for optical fiber sharing ( Digital summing) and converts the digital signal into a digital electrical signal, and transmits the digital signal to the 'reframer' which is the frame realignment unit 130 of the wireless signal monitoring apparatus 100.

②. The frame realigner 130 of the wireless signal monitoring apparatus 100 detects a synchronous clock and a frame synchronous signal using an electric digital signal. In addition, when the wireless signal is a multi-FA or MIMO, the 'reframer' transmits a signal to the 'IQ searcher' which is the extractor 140 of the wireless signal monitoring apparatus 100 by separating the multiple TX data data streams.

③. The extractor 140 of the wireless signal monitoring apparatus 100 extracts the sampling rate and the IQ data of the digitally modulated wireless signal.

④. The digital signal processor DSP, the signal processor 150 of the wireless signal monitoring apparatus 100, receives the sampling rate and the IQ data from the IQ searcher and processes the digital signal. Then, the monitoring unit 160 provides a radio signal performance analysis function that can be expressed in the RF spectrum or code domain power, EVM, or traffic analysis.

Wireless signal monitoring or performance analysis in a wavelength division multiplexing (WDM) system for sharing the optical access digital optical signal of the radio band between the baseband unit 102 and the remote radio unit 104 of the separate base station using the aforementioned method. Can be provided. In addition, a remote terminal (RT), which is a demultiplexing system for sharing optical paths, may provide a radio signal monitoring or performance analysis function by the above-described method, and a base station in which the radio signal monitoring apparatus 100 is installed. You can check the radio signal by EMS or Web remotely without going to the company.

6 is a block diagram showing a frame rearranging unit and an extracting unit according to the present embodiment (first to third embodiments).

The frame reordering unit 130 is a kind of frame extracting unit and includes a CDR and a reframer 620. CDR 610 separates the clock and data from the received signal. That is, the CDR 610 generates a CDR block that separates clock and data from the received signal. The leaframer 620 then checks whether or not a normal frame is detected in the data delivered in the CDR block. The leaf reamer 620 may determine whether a normal frame for the CPRI signal, the OBSAI signal, or the ORI signal is detected. As a result of the check, when an abnormal frame signal is detected, the leaf reamer 620 changes the CDR setting. The leaf reamer 620 may control the CDR 610 to repeatedly perform a signal rate reset until a normal frame signal is detected.

The extractor 140 is a kind of IQ searcher, and includes an IQ demapper 630, an IQ signal analyzer 640, and a first digital signal processor DSP1 650. The IQ demapper (IQ searcher) 630 extracts the IQ signal from the payload data extracted from the leaframer block. In addition, the IQ demapper (IQ searcher) 630 adjusts the channel bandwidth, the sample rate, and the signal bit size of the IQ signal, and sequentially changes the channel bandwidth, the sample rate, and the signal bit size. The IQ signal analyzer 640 arranges the extracted IQ signal into multiple FA signals. The first digital signal processor (DSP1) 650 checks the SNR characteristics of the multiple FA signals and determines whether they are normal signals. When the signal-to-noise ratio (SNR) characteristic is abnormal, the first digital signal processor DSP1 returns to the IQ demapper block to rearrange the IQ signals (adjust the channel bandwidth, sample rate, and signal bit size).

The signal processor 150 may include a second digital signal processor DSP2. The second digital signal processor (DSP2) performs signal performance analysis. When the output from the first digital signal processor (DSP1) 650 secures a signal-to-interference ratio (SNR) in a normal range, the signal performance is analyzed. do. The second digital signal processor DSP2 analyzes characteristics such as EVM, code domain power, and spectrum in a frequency domain through signal analysis. Here, the second digital signal processor DSP2 processes the analyzed characteristic result as graphic data.

The above description is merely illustrative of the technical idea of the present embodiment, and those skilled in the art to which the present embodiment belongs may make various modifications and changes without departing from the essential characteristics of the present embodiment. Therefore, the present embodiments are not intended to limit the technical idea of the present embodiment but to describe the present invention, and the scope of the technical idea of the present embodiment is not limited by these embodiments. The scope of protection of the present embodiment should be interpreted by the following claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present embodiment.

(Explanation of the sign)

100: wireless signal monitoring device 102: baseband signal processing unit

104: remote wireless unit 110: optical branching unit

120: photoelectric conversion unit 130: frame rearranging unit

140: extraction unit 150: signal processing unit

160: monitoring unit

CROSS-REFERENCE TO RELATED APPLICATION

This patent application claims priority under US patent law section 119 (a) (35 USC § 119 (a)) to patent application No. 10-2013-0054610 filed with Korea on 14 May 2013. All content is incorporated by reference in this patent application. In addition, if this patent application claims priority for the same reason for countries other than the United States, all its contents are incorporated into this patent application by reference.

Claims (13)

An optical branching unit for branching an optical signal input from the optical network; A photoelectric conversion unit converting the optical signal into an electrical signal; Frame realignment for detecting a synchronous clock and a frame synchronous signal from a frame, which is a data unit having a digital structure of the electrical signal, and outputting reframed data to a time point at which data is loaded in the frame by the frame synchronous signal. part; An extraction unit configured to extract a sampling rate and an in-phase quadrature (IQ) data string group, the sampling rate of the reframed data during a preset unit time; And A signal processor configured to generate signal processing data obtained by digitally processing the sampling rate and the IQ data string group; Wireless signal monitoring device comprising a. The method of claim 1, The monitoring unit generating the RF spectrum analysis data or the RF performance analysis data using the signal processing data Wireless signal monitoring device further comprising. The method of claim 1, The optical branching unit, The optical signal monitoring apparatus is implemented as an optical tap for branching the optical signal, and outputs the optical signal by branching the optical signal according to a preset branching ratio. The method of claim 1, The optical branching unit, Base Band Units (BBUs) and Remote Radio Units (RRUs) connected by one or more of the open radio interfaces Common Public Radio Interface (CPRI), Open Base Station Architecture Initiative (OBASI), and Open Radio Interface (ORI). And a branching of the optical signal between the Remote Radio Units. The method of claim 1, The optical branching unit, A wireless signal monitoring device, characterized in that for branching the plurality of optical signals in the front hole (Fronthaul) of the distributed base station. The method of claim 5, The extraction unit, The sampling data and the IQ data sequence group are separated into two blocks, and then the IQ data sequence group is transmitted to the signal processor to generate performance analysis data of a radio signal, or the IQ data sequence group is converted into a digital analog converter (DAC). Wireless signal monitoring device to be transmitted to the external analog signal to be transmitted to). The method of claim 1, The frame reordering unit, Extracts the start point of the frame, outputs the reframed data based on the start point, processes the bits of the reframed data and checks whether it is normal, and a loss state identified by the check result Wireless signal monitoring device characterized in that for outputting. The method of claim 1, The frame reordering unit, When the frame is a multiple frequency allocation (FA) or multiple input multiple output (MIMO) data, the wireless signal monitoring apparatus, characterized in that for transmitting the Tx data stream (Data Stream) in FA unit to the extraction unit. A photoelectric conversion unit converting an optical signal input from an optical line sharing device using wavelength division multiplexing (WDM) into an electrical signal; A frame rearranging unit which detects a synchronous clock and a frame synchronous signal from a frame which is a data unit having a digital structure of the electric signal, and outputs reframed data to a time point at which data is loaded into the frame by the frame synchronous signal; An extraction unit configured to extract a sampling rate and an IQ data string group, which is a sampling frequency of the reframed data during a preset unit time; And A signal processor configured to generate signal processing data obtained by digitally processing the sampling rate and the IQ data string group; Wireless signal monitoring device comprising a. The method of claim 9, The photoelectric conversion unit, And a base band unit (BBU) or a remote radio unit (RRU). In the radio signal monitoring apparatus for analyzing a radio signal, An optical branching process of branching an optical signal input from the optical network; A photoelectric conversion process of converting the optical signal into an electrical signal; A frame realignment process of detecting a synchronous clock and a frame synchronous signal from a frame which is a data unit having a digital structure of the electrical signal, and outputting reframed data to a time point at which data is loaded into the frame by the frame synchronous signal; An extraction process of extracting a sampling rate and an IQ data sequence group, which is a sampling frequency during the predetermined unit time of the reframed data; And A signal processing process of generating signal processing data obtained by digitally processing the sampling rate and the IQ data string group, respectively. Wireless signal monitoring method comprising a. The method of claim 11, Monitoring process for generating RF spectrum analysis data or RF performance analysis data using the signal processing data Wireless signal monitoring method characterized in that it further comprises. In the radio signal monitoring apparatus for analyzing a radio signal, A photoelectric conversion process of converting an optical signal input from the optical line sharing device into an electrical signal; A frame realignment process of detecting a synchronous clock and a frame synchronous signal from a frame which is a data unit having a digital structure of the electrical signal, and outputting reframed data to a time point at which data is loaded into the frame by the frame synchronous signal; An extraction process of extracting a sampling rate and an IQ data sequence group, which is a sampling frequency during the predetermined unit time of the reframed data; And A signal processing process of generating signal processing data obtained by digitally processing the sampling rate and the IQ data string group, respectively. Wireless signal monitoring method comprising a.

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