KR20100021156A - Apparatus for measuring signal quality - Google Patents

Apparatus for measuring signal quality Download PDF

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Publication number
KR20100021156A
KR20100021156A KR1020080079911A KR20080079911A KR20100021156A KR 20100021156 A KR20100021156 A KR 20100021156A KR 1020080079911 A KR1020080079911 A KR 1020080079911A KR 20080079911 A KR20080079911 A KR 20080079911A KR 20100021156 A KR20100021156 A KR 20100021156A
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South Korea
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signal
data
rf data
rf
wireless communication
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KR1020080079911A
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Korean (ko)
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KR100975592B1 (en
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구자헌
박준완
정진섭
지승환
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주식회사 이노와이어리스
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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/20Monitoring; Testing of receivers
    • H04B17/26Monitoring; Testing of receivers using historical data, averaging values or statistics
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters

Abstract

PURPOSE: An apparatus for measuring signal quality of a wireless communication signal are provided to receive a wireless communication signal on the air and store by separating an effectiveness data and RF data and compare/analyze the effectiveness/RF data thereby analyze a dynamic signal comprehensively. CONSTITUTION: A signal receiving part(101) selectively receives a wireless communication signal on the air. An effectiveness data storage part(105) stores the effectiveness data of the wireless communication signal. A RF(Radio Frequency) data storage module(107) stores a RF data for transmission of the effectiveness data. A signal processing unit(109) demodulates the received wireless communication signal, extracts the effectiveness data, store in the effectiveness data storage part, and store the RF data in the RF data storage part. An identifying information allocation(111) assigns the same id to the effectiveness data and the RF data. A control part(113) analyzes the demodulated effectiveness data and measures/provides a signal quality using by an analysis result.

Description

Apparatus for measuring signal quality

The present invention relates to a signal quality measuring apparatus, and more particularly, to receive wireless communication signals on air, to separate and store effective data and RF data, and to compare and analyze them, thereby enabling signal quality to be comprehensively analyzed. It relates to a measuring device.

Due to the development of wireless communication technology, not only voice calls but also data communication are rapidly developing. Such data communication, that is, wireless access to the Internet, is largely based on a platform such as the Wireless Application Protocol (WAP) or the Wireless Internet Platform for Interoperability (WIPI), and is accessed through a mobile telephone network and access to a public wireless LAN. There is a method of access through an access point.

However, in the case of a mobile telephone network, there is a fundamental limitation as a universal means of accessing the Internet due to the limitation of screen size, input interface and billing system based on pay-as-you-go system. In addition, the wireless LAN has a fundamental problem of being vulnerable to mobility, in addition to the local constraint that it can be used only within a few tens of meters around the access point.

In order to overcome this problem, the domestic standard WiBro and 3GPP (long term evolution) and LTE (3GPP) have been proposed as Mobile WiMAX, or a subset thereof, that enables high-speed Internet access even when stationary or moving vehicles with ADSL quality and cost. have.

LTE is a technology in which a circuit switch method is converted into a packet switch method to solve an inefficient problem of resource use of a circuit switch method. In the packet switch method of the LTE system, the use of radio resources is more efficient than the circuit switch method in that a terminal to which radio resources are to be allocated is selected according to whether or not data is required to be transmitted and received, and a wireless channel situation of the terminal that is dynamically changed according to time. There is a high advantage.

As described above, in the case of LTE, FDD is a main option in resource allocation, but in some cases, the TDD option can be used, and the time ratio of uplink and downlink is dynamically changed only for the option of LTE-TDD. Can change.

1 is a schematic diagram schematically showing the structure of a LTE (Long Term Evolution) network, which is a conventional and mobile communication system to which the present invention is applied. The LTE system is an evolution from the existing UMTS system and is currently undergoing basic standardization in 3GPP.

The LTE network includes a user equipment (hereinafter abbreviated as UE), a base station (hereinafter abbreviated as eNode B), and an access gateway (abbreviated as AG) located at an end of the network and connected to an external network. The AG may be divided into a user plane entity (UPE) node in charge of user traffic processing and a mobility management entity (MME) node in charge of control. At this time, the MME and the UPE node can communicate with each other using a new interface. One or more cells may exist in one eNode B. An interface X2 for transmitting user traffic or control traffic is defined between eNode Bs. The interface S1 is defined between the eNode B and the AG.

Layers of the radio interface protocol between the terminal and the network are based on the lower three layers of the Open System Interconnection (OSI) reference model, which is widely known in communication systems. (Second layer) and L3 (third layer), wherein a physical layer belonging to the first layer provides an information transfer service using a physical channel, and a third layer. A radio resource control (hereinafter referred to as RRC) layer located in a layer plays a role of controlling radio resources between a terminal and a network. To this end, the RRC layer exchanges RRC messages between the terminal and the network. The RRC layer may be distributed in network nodes such as an eNode B and an AG, or may be located only in the eNode B or an AG.

A downlink transmission channel for transmitting data from a network to a UE includes a broadcast channel (BCH) for transmitting system information and a downlink shared channel (SCH) for transmitting user traffic or control messages. Traffic or control messages of a downlink multicast or broadcast service may be transmitted through a downlink SCH or may be transmitted through a separate downlink multicast channel (MCH). Meanwhile, the uplink transmission channel for transmitting data from the terminal to the network includes a random access channel (RAC) for transmitting an initial control message and an uplink shared channel (SCH) for transmitting user traffic or control messages.

However, measuring the quality of equipment and wireless communication signals in such a wireless communication system is the most important process in system construction and operation. Accordingly, in the related art, a wireless communication signal transmitted between a base station and a terminal through a terminal emulator or a base station emulator has been analyzed.

Here, the terminal emulator means a portable internet measuring instrument having a function of establishing a connection with a base station to replace the actual terminal, receiving a signal transmitted from the base station, analyzing the same, and measuring the performance of the base station. In addition, the base station emulator refers to a measuring instrument that performs the opposite role of the terminal emulator described above.

However, since the analysis of the wireless communication signal only analyzes the effective data of the received signal corresponding to the data output through the emulator, the corresponding signal reception environment is not known. There is a disadvantage that cannot be confirmed.

SUMMARY OF THE INVENTION The present invention has been devised in this background, and its object is to receive wireless communication signals on air, and to classify and store effective data and RF data, and to compare and analyze them, so that a signal quality measuring device capable of comprehensive analysis of dynamic signals is possible. To provide.

Furthermore, by storing the RF data separately, it is possible to determine the RF environment at the time of reception of the corresponding wireless communication signal, as well as to measure the signal quality that can recover and use the damaged effective data through the corresponding RF data when the received effective data is damaged. To provide a device.

Furthermore, the present invention provides a signal quality measuring apparatus capable of identifying a cause of a wireless communication signal reception failure through an RF environment when the problem of reception failure between the base station and the terminal cannot be clearly identified through the stored RF data.

In accordance with an aspect of the present invention described above, an apparatus for measuring signal quality according to the present invention includes: a signal receiving unit for selectively receiving a wireless communication signal on air; An effective data storage unit for storing effective data of a wireless communication signal; An RF data storage unit for storing RF data for transmitting effective data; A signal processor which demodulates the wireless communication signal received by the signal receiver, extracts the effective data, stores the effective data, and stores the RF data in the RF data storage; An identification information allocator for generating and allocating the same identification information to the effective data and the RF data output by the signal processor; It includes a control unit for controlling the overall signal quality measuring apparatus, analyzing the demodulated effective data by the signal processing unit and measuring and providing signal quality through the analysis result.

According to a characteristic aspect of the present invention, the signal quality measuring apparatus according to the present invention assigns the same identification information to the demodulated effective data and the RF data for transmitting the effective data by the signal processor, and generates an ID generated by any pair, One of frame number and signal reception time information included in the wireless communication signal is used as identification information.

According to a characteristic aspect of the present invention, the RF data storage unit of the signal quality measuring apparatus according to the present invention sequentially stores the RF data output by the signal processing unit, and forms a circular buffer for deleting the oldest RF data. .

According to a characteristic aspect of the present invention, the signal quality measuring apparatus according to the present invention receives RF data stored together with the effective data using a threshold value of a predetermined time, a specified period, and a reception quality of a signal from an input time of a user's storage command. It is stored only when the specified message is included in the quality deterioration and reception effective data.

The signal quality measuring apparatus according to the present invention receives the wireless communication signal on the air, stores the effective data and the RF data separately, and compares and analyzes each other, thereby having the advantage of comprehensive analysis of the dynamic signal.

In addition, the signal quality measuring apparatus according to the present invention by matching the RF data through the effective data and the identification information and separately stored, it is possible to determine the RF environment at the time of reception of the wireless communication signal, as well as received effective data corruption It has the advantage that can be used to recover the corrupted effective data through the corresponding RF data.

In addition, the signal quality measuring apparatus according to the present invention has an advantage of identifying the cause of the wireless communication signal reception failure through the RF environment through stored RF data when the problem of the reception failure between the base station and the terminal cannot be clearly identified.

The foregoing and aspects of the present invention will become more apparent through preferred embodiments described with reference to the accompanying drawings. Hereinafter, the present invention will be described in detail to enable those skilled in the art to easily understand and reproduce the present invention.

2 is a schematic diagram schematically illustrating a concept of a signal quality measuring system using a signal quality measuring apparatus according to an exemplary embodiment of the present invention. As shown, the signal quality measurement system using the signal quality measurement apparatus 100 according to the present invention is a base station (BS) or a base station emulator and a terminal (SS) Subscriber Station or UE (User Equipment) or And a terminal emulator and a signal quality measuring apparatus 100.

In the above-described signal quality measuring system, the signal quality measuring apparatus 100 receives (captures) a wireless communication signal transmitted and received from a base station to a terminal or from a terminal to a base station, and analyzes the received wireless communication signal and provides an analyzed result. .

The signal quality measuring apparatus 100 may be referred to as a sniffer, which is a device used to optimize a network by analyzing traffic data with a program for monitoring and analyzing network traffic. It also refers to a representative cracking technique that infiltrate packets and intercept information, or a database analysis program.

The signal quality measuring apparatus 100 will be described in more detail with reference to FIGS. 3 and 4.

3 is a block diagram schematically illustrating an apparatus for measuring signal quality according to an exemplary embodiment of the present invention, and FIG. 4 is a schematic diagram schematically showing a hierarchical structure of an apparatus for measuring signal quality according to an exemplary embodiment of the present invention. to be. As shown, the signal quality measuring apparatus 100 according to the present invention is a signal receiving unit 101 for selectively receiving a wireless communication signal on the air (Air), and the effective data storage unit that stores the effective data of the wireless communication signal 105, an RF data storage unit 107 for storing RF data for transmission of the effective data, and demodulating the wireless communication signal received by the signal receiving unit 101 to extract the effective data to obtain the effective data storage unit ( An identification for generating and allocating the same identification information to the effective data and the RF data outputted by the signal processing section 109 and the RF data storage section 107 and the RF data storage section 107. Controls the first part of the information allocator 111 and the signal quality measuring apparatus 100, and analyzes the demodulated data demodulated by the signal processor 109 and measures and provides the signal quality through the analysis result. It is configured, including 113.

In addition, the signal quality measuring apparatus 100 according to the present invention includes an analog-to-digital converter (ADC) for converting and outputting a wireless communication signal, which is an analog signal received by the signal receiving unit 101, into a digital signal. Since the signal processing unit 109 and the control unit 113 for signal analysis and measurement are implemented in a digital logic circuit, such an ADC 103 is a necessary configuration.

The signal receiving unit 101 is, for example, Mobile WiMAX or a subset thereof, as well as voice data such as CDMA and WCDMA, as well as mobile data communication such as WiBro, a national standard, and 3rd Generation Partnership Project (3GPP) long term evolution (LTE) system. It is sufficient if the RF antenna module used in the communication protocol based on the downlink (DL: downlink) communication signal transmitted from the base station to the terminal or uplink (UL: uplink) radio communication signal transmitted from the terminal to the base station. Receive and output

The wireless communication signal thus received is converted into a digital signal by the ADC 103 and output to the signal processor 109.

The effective data storage unit 105 may be, for example, an EEPROM or a flash memory capable of reading and writing, and stores the invalid data demodulated and output by the signal processing unit 109. The effective data stored in this way is controlled by the control unit 113.

The RF data storage unit 107 may be, for example, an EEPROM or a flash memory capable of reading and writing, and stores the RF data output by the signal processing unit 109. The RF data thus stored is controlled for access at the request of the controller 113.

According to a characteristic aspect of the present invention, the RF data storage unit 107 according to the present invention may be implemented as a circular buffer. The circular buffer is a circular buffer, which is used to effectively operate a certain amount of memory. The RF data output by the signal processor 109 is stored in a continuous array of a predetermined size, and the control unit 113 accesses the RF data stored in the continuous array in the input order. In this way, when the signal processor 109 stores the RF data from the first array to the last array, the signal processor 109 returns to the front to store the RF data in the first item of the array. In this case, the array is actually formed in one circle.

The signal processor 109 may be implemented by, for example, a Field Programmable Gate Array (FPGA) and a Digital Signal Processor (DSP). The signal processor 109 may be received through the signal receiver 101 and converted into a digital signal by the ADC 103. Receives and demodulates a wireless communication signal to extract and output effective data, and outputs RF data, which is raw data (RAW Data) of the wireless communication signal, to an RF data storage processor. In addition, the signal processor 109 may include a DRAM configured to temporarily store effective data or RF data extracted through demodulation therein.

The signal processor 109 receives the radio communication signal output from the ADC 103 and decodes the effective data by decoding through the method according to the various communication protocols described above. Such effective data may be actual service data serviced between a base station and a terminal, or test data generated for signal quality measurement.

The effective data output by the signal processor 109 is actual data excluding various protocol information for data transmission. When the LTE system is described as an example, services included in PBCH, PDCCH, PDSCH, and PHICH included in each subframe are described. Data or message data. The effective data extracted by the signal processing unit 109 is output to the control unit 113, and the control analyzes this and provides the result.

According to a characteristic aspect of the present invention, the effective data and the RF data output by the signal processing unit 109 are stored with unique identification information for synchronization between the two data. The reason for assigning and storing identification information is to effectively access the stored RF data when a problem occurs in the corresponding effective data or when checking mutual quality information between the effective data and the RF data.

Accordingly, the identification information allocating unit 111 assigns unique identification information to the effective data output by the signal processing unit 109 and the RF data corresponding thereto. This identification information is also used as an index when accessing RF data.

The identification information provided to the effective data and the RF data by the identification information allocating unit 111 may be, for example, ID, frame number, and signal reception time information generated in any pair. The IDs generated in any pair may be identification numbers arbitrarily generated by the identification information allocator 111.

In the LTE system, a plurality of frames are formed, and each frame is composed of subframes. Various channels exist in such a frame, and the identification information allocator 111 extracts a frame number in which the effective data exists and uses the identification information.

In addition, the signal reception time information is time information when the corresponding wireless communication signal is received through the signal receiving unit 101. Such signal reception time information may be, for example, GPS time information provided from a GPS satellite, or may be local time information provided from a base station.

In addition, the signal processing unit 109 and the identification information allocating unit 111 may be physically implemented as a single element, and the function may be provided to the signal processing unit 109 even if the identification information allocating unit 111 is not implemented separately. It can also be implemented.

The controller 113 may be implemented as, for example, a microcontroller in which a microprocessor for calculation and a peripheral circuit thereof are physically integrated in one chip. The control unit 113 controls the first half of the signal quality measuring apparatus 100, and measures the quality of the corresponding signal by accessing and analyzing the effective data stored in the effective data storage unit 105. The signal quality measurement of the control unit 113 is mainly performed by analyzing various sublayers existing in the layer 2 (L2), and the analyzed result is provided through a display means such as an LCD so that the user can visually confirm.

According to an additional aspect of the present invention, the control unit 113 according to the present invention accesses RF data corresponding to the effective data stored in the RF data storage unit 107 when it is necessary to determine the RF environment when receiving a wireless communication signal, Analyze the RF data and measure the quality according to the RF environment.

In addition, when the effective data is damaged, the control unit 113 accesses the RF data corresponding to the effective data, that is, the RF data having the same identification information as the effective data from the RF data storage unit 107, and the signal processing unit ( 109). Accordingly, the signal processing unit 109 re-extracts the effective data from the corresponding RF data and outputs the effective data to the control unit 113 so that the control unit 113 can recover the damaged effective data through the stored RF data and use it for the measurement.

Accordingly, the signal quality measuring apparatus 100 according to the present invention can determine the RF environment at the time of reception of the corresponding wireless communication signal, and restore and use the damaged effective data through the corresponding RF data when the received effective data is damaged. Has the advantage.

According to a characteristic aspect of the present invention, the signal quality measuring apparatus 100 according to the present invention selectively stores RF data of a received wireless communication signal, so that only portions necessary for measurement can be stored and managed.

Accordingly, the signal processing unit 109 of the signal quality measuring apparatus 100 according to the present invention stores the RF data in the RF data storage unit 107 for a designated time from a storage command input time input from the user. When the user confirms that the user wants to store the RF data during the signal quality monitoring through the signal quality measuring apparatus 100, the user inputs a command to store the RF data through the input unit provided in the signal quality measuring apparatus 100. Accordingly, the control unit 113 outputs a storage command of the corresponding RF data to the signal processing unit 109, and the signal processing unit 109 receives the RF data of the wireless communication signal received for a predetermined time from the time when the corresponding storage command is received. The data storage unit 107 stores the data. The storage time can also be set by the user.

According to an additional aspect of the present invention, the signal processor 109 according to the present invention may store RF data at a designated time period at a designated time period set by a user. For example, when the user sets the storage period of the RF data to 5 seconds, the signal processing unit 109 stores the RF data of the wireless communication signal received for a specified time in a 5-second period in the RF data storage unit 107. .

According to an additional aspect of the present invention, the signal processing unit 109 according to the present invention detects a change in the EVM of the received wireless communication signal and drops the RF data of the corresponding wireless communication signal to the RF storage unit 107 when it falls below a specified value. You can also save.

The analysis result displayed by the controller according to the present invention may be, for example, analysis information such as Error Vector Magnitude, Error Vector Spectrum, Error Vector Time, I / Q Constellation, Cell ID, and Segment.

1 is a schematic diagram schematically showing the structure of a LTE (Long Term Evolution) network, which is a conventional and mobile communication system to which the present invention is applied.

2 is a schematic diagram schematically illustrating a concept of a signal quality measuring system using a signal quality measuring apparatus according to an exemplary embodiment of the present invention.

3 is a block diagram schematically illustrating an apparatus for measuring signal quality according to an exemplary embodiment of the present invention.

4 is a schematic diagram schematically illustrating a hierarchical structure of an apparatus for measuring signal quality according to an exemplary embodiment of the present invention.

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

100. Signal quality measuring device 101. Signal receiving unit

103. ADC 105. Effective Data Storage

107. RF data storage section 109. Signal processing section

111. Identification information allocating unit 113. Control unit

Claims (9)

  1. A signal receiver for selectively receiving a wireless communication signal on air;
    An effective data storage unit for storing effective data of the wireless communication signal;
    An RF data storage unit for storing RF data for transmitting the effective data;
    A signal processor for demodulating the wireless communication signal received by the signal receiver, extracting effective data, storing the effective data in the effective data storage, and storing RF data in the RF data storage;
    An identification information allocator for generating and allocating the same identification information to the effective data and the RF data output by the signal processor;
    And a control unit which controls the overall signal quality measuring apparatus and analyzes the demodulated data demodulated by the signal processing unit and measures and provides the signal quality through the analysis result.
  2. The method according to claim 1, wherein the RF data storage unit:
    And a circular buffer for sequentially storing the RF data output by the signal processor and deleting the RF data having the oldest storage time.
  3. The method of claim 2, wherein the identification information is:
    Signal quality measuring apparatus, characterized in that any one of the ID, frame number, received time information generated in any pair.
  4. The method of claim 3, wherein the control unit:
    Signal quality measuring apparatus characterized in that to access the RF data having the same identification information as the effective data for the signal quality measurement from the RF data storage to perform RF quality measurement and provide it.
  5. The method of claim 4, wherein the signal processing unit:
    And storing RF data for a specified time from a storage command input time input from a user.
  6. The method of claim 4, wherein the signal processing unit:
    A signal quality measurement apparatus, characterized in that for storing the RF data at a specified time period.
  7. The method of claim 4, wherein the signal processing unit:
    And detecting the change in the EVM of the received wireless communication signal and falling below a specified value, and storing the RF data of the corresponding wireless communication signal in the RF data storage unit.
  8. The method of claim 4, wherein the signal processing unit:
    And storing the RF data of the corresponding wireless communication signal in the RF data storage unit when a designated message exists in the effective data.
  9. The method according to any one of claims 1 to 8,
    And the wireless communication signal is an LTE system signal.
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