JP2017059976A - Radio wave propagation measuring device and reception timing display method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a radio wave propagation measuring device capable of easily confirming deviations of reception timings of a plurality of CCs performing carrier aggregation.SOLUTION: The radio wave propagation measuring device includes: a radio signal measuring unit 11 that measures reception timing of a radio signal and outputs the measurement result to a control unit 13; an input unit 121 that accepts an operation input from a user; a display unit 122 that displays the measurement result of the radio signal measuring unit 11 and such; and a control unit 13 that displays on the display unit 122 in a list radio signal information in an ascending order of absolute values of differences between reference timings and frame timings.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a radio wave propagation measuring apparatus that measures a radio wave propagation state of a base station of a mobile communication system.

  In a mobile communication system such as a mobile phone, a large number of base stations are installed in a service providing area. The base stations are installed so that the ranges of the output radio waves are overlapped with each other between adjacent base stations, so as to eliminate the places where the radio waves of the base stations do not reach within the service providing area.

  In such a mobile communication system, measuring the propagation state of radio waves from a base station at an arbitrary point in the service providing area is important for maintenance of the base station and management of the service providing area.

  Patent Document 1 proposes an apparatus for measuring a propagation state of a radio wave from a base station in a W-CDMA (Wideband-Code Division Multiple Access) type mobile communication system.

JP 2002-280974 A

  In the 3rd Generation Partnership Project (3GPP) that creates a standard for wireless communication, a carrier aggregation (Carrier Aggregation) technique is introduced in the LTE-A (Long Term Evolution-Advanced) standard. This carrier aggregation is intended to improve the transmission speed by performing communication using a plurality of LTE carriers simultaneously.

  In carrier aggregation, communication is performed using a plurality of LTE carriers called component carriers (hereinafter also referred to as “CC”). In carrier aggregation, transmission between a mobile communication terminal and a base station and one primary component carrier (hereinafter also referred to as “PCC”) that is a CC necessary for the mobile communication terminal to maintain a connection with the base station. Communication is performed with one or more secondary component carriers (hereinafter also referred to as “SCC”), which are CCs used to improve speed.

  A plurality of CCs that perform carrier aggregation must have a reception timing shift within a certain time difference within a terminal.

  For this reason, in the radio wave propagation measuring apparatus used in the service providing area corresponding to carrier aggregation, it is required that a shift in reception timing of a plurality of CCs can be easily confirmed.

  Therefore, an object of the present invention is to provide a radio wave propagation measuring apparatus that can easily check a shift in reception timing of a plurality of CCs that perform carrier aggregation.

  The radio wave propagation measuring apparatus of the present invention is a radio wave propagation measuring apparatus that measures the propagation state of a radio signal from a base station, and displays a display unit that displays an image and the measurement result of the radio signal on the display unit. A control unit, and when the reception timing of the radio signal is displayed, the control unit displays the information of the radio signal in a list in order of a difference from a preset reference timing.

  With this configuration, wireless signal information is displayed in a list in the order of difference from a preset reference timing. For this reason, radio signals with reception timings that are close to the reference timing are displayed together, and a shift in reception timing can be easily confirmed.

  The radio wave propagation measuring apparatus according to the present invention further includes an input unit that receives an operation input, and the control unit changes the reference timing by an operation input to the input unit.

  With this configuration, the reference timing by the operation input to the input unit is changed. For this reason, the target radio signal can be displayed at the top of the list display by changing the reference timing, and a shift in reception timing can be easily confirmed.

  In the radio wave propagation measuring apparatus of the present invention, the control unit displays a graph indicating a difference between the reception timing of the radio signal and the reference timing on the display unit.

  With this configuration, the difference between the reference timing and the reception timing of the radio signal is displayed by the graph. For this reason, a difference from the reference timing can be easily visually confirmed, and a shift in reception timing can be easily confirmed.

  In the radio wave propagation measuring apparatus of the present invention, the control unit moves the reference timing on the graph by an operation input to the input unit, and changes the reference timing in accordance with the movement.

  With this configuration, the reference timing is changed by moving the reference timing on the graph by an operation input to the input unit. For this reason, the reference timing can be easily changed to the intended reception timing visually, and a shift in reception timing can be easily confirmed.

  Further, the reception timing display method of the present invention is a reception timing display method of a radio wave propagation measuring apparatus for measuring a propagation state of a radio signal from a base station, the step of calculating the reception timing of a received radio signal, A step of calculating a difference between the set reference timing and the reception timing, and a step of displaying a list of information on the radio signal in the order of the difference from the reference timing.

  With this configuration, wireless signal information is displayed in a list in the order of difference from a preset reference timing. For this reason, radio signals with reception timings that are close to the reference timing are displayed together, and a shift in reception timing can be easily confirmed.

  The present invention can provide a radio wave propagation measuring device capable of easily confirming a shift in reception timing of a plurality of CCs that perform carrier aggregation.

FIG. 1 is a block diagram of a radio wave propagation measuring apparatus according to a first embodiment of the present invention. FIG. 2 is a diagram showing the frame timing of the radio wave propagation measuring apparatus according to one embodiment of the present invention. FIG. 3 is a diagram showing a display example of the measurement result of the radio wave propagation measuring apparatus according to the embodiment of the present invention. FIG. 4 is a view showing a display example of a radio wave propagation measuring apparatus measurement result according to an embodiment of the present invention, FIG. 4A is a view showing an example of timing order display, and FIG. It is a figure which shows the example of a timing (DELTA) order display.

  Hereinafter, a radio wave propagation measuring apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In FIG. 1, a radio wave propagation measuring apparatus 1 according to an embodiment of the present invention includes a radio signal processing unit 10, a radio signal measuring unit 11, a user interface unit 12, and a control unit 13. .

  The radio signal processing unit 10 outputs the radio signal received from the base station 2 via the antenna 16 to the radio signal measurement unit 11 by performing amplification or frequency conversion.

  The radio signal measurement unit 11 is connected to the radio signal processing unit 10 to demodulate and decode the radio signal output from the radio signal processing unit 10, and to perform RSRP (Reference Signal Received Power), RSSI (Received Signal Strength Indicator), RSRQ (Reference Signal Received Quality), SIR (Signal to Interference Ratio), reception timing, and the like are measured, and the measurement result is output to the control unit 13. The control unit 13 stores the measurement result from the radio signal measurement unit 11 in a hard disk or the like in association with time information and the like, and causes the user interface unit 12 to display and output the log as a log according to a user request. It is supposed to be.

  The radio signal measuring unit 11 is configured to receive a clock signal from a GPS (Global Positioning System) receiving unit 14 or an internal clock 15. The radio signal measuring unit 11 measures the reception timing of the LTE radio signal based on a PPS (Pulse Per Second) signal from the GPS receiving unit 14 or a clock signal from the internal clock 15. Yes. In addition, you may make it input a GPS signal from the outside.

  The user interface unit 12 includes an input unit 121 that receives an operation input from a user, and a display unit 122 that displays a measurement parameter setting screen, a measurement result of the wireless signal measurement unit 11, and the like. The input unit 121 includes a touch pad, a keyboard, a push button, a rotary knob, and the like. The display unit 122 is configured by a liquid crystal display device or the like.

  The control unit 13 is configured by a computer unit including a CPU (Central Processing Unit), a RAM (Random Access Memory), a ROM (Read Only Memory), a hard disk device, and an input / output port (not shown).

  The ROM and hard disk device of this computer unit store various control constants, various maps, and the like, as well as programs for causing the computer unit to function as the control unit 13. That is, the computer unit functions as the control unit 13 when the CPU executes a program stored in the ROM and the hard disk device. The hard disk device may be a CF (Compact Flash) card using a flash memory.

  A wireless signal measurement unit 11 and a user interface unit 12 are connected to the input / output port of the control unit 13 so that the control unit 13 and each unit can transmit and receive signals.

  In the present embodiment, the wireless signal measurement unit 11 is configured by a processor such as a DSP (Digital Signal Processor) programmed to execute each process. The wireless signal processing unit 10 is configured by a communication module.

  In such a radio wave propagation measuring apparatus 1, the control unit 13, for example, measures a radio signal having a frequency set by an operation input to the input unit 121 on the setting screen displayed on the display unit 122. To do.

  The control unit 13 causes the input unit 121 to input the center frequency and frequency bandwidth of the wireless signal to be measured, the number of signals to be measured, and the like on the setting screen displayed on the display unit 122. A plurality of center frequencies of radio signals to be measured can be set.

  The control unit 13 notifies the wireless signal measurement unit 11 of the setting information input from the input unit 121 and causes the wireless signal measurement to be performed.

  When the setting information is notified from the control unit 13, the wireless signal measuring unit 11 notifies the wireless signal processing unit 10 of the notified center frequency and frequency bandwidth, and transmits the wireless signal of the center frequency and frequency bandwidth. Receive.

  When the radio signal processing unit 10 is notified of the center frequency and the frequency bandwidth from the radio signal measurement unit 11, the radio signal processing unit 10 receives a radio signal having the center frequency and the frequency bandwidth, and performs amplification, frequency conversion, and the like to perform the radio signal measurement unit. 11 is output.

  The radio signal measurement unit 11 demodulates and decodes the radio signal output from the radio signal processing unit 10, measures RSRP, RSSI, RSRQ, SIR, reception timing, and the like, and outputs the measurement result to the control unit 13.

  Based on the measurement result output from the wireless signal measuring unit 11, the control unit 13 creates an image to be displayed on the display unit 122 according to the measurement result display type selected by the operation input of the input unit 121, and displays the display unit 122. To display.

  The LTE wireless system has a structure in which 10 ms frames are continuous. In carrier aggregation in which communication is performed using a plurality of CCs, a shift in reception timing of each CC must be within a certain time.

  As shown in FIG. 2, the radio signal measuring unit 11 uses a 10 ms cycle signal obtained by dividing the PPS from the GPS receiving unit 14 to 1/100 or a 10 ms cycle signal generated by the internal clock 15 as a reference. The time difference between the reception timing of each CC frame and the 10 ms period signal is measured as a frame timing value.

  In FIG. 2, the frame timing value of CC-1 is a deviation Ta from a reference 10 ms period signal, and the frame timing value of CC-2 is Tb.

  The frame timing value is calculated as a relative time from a signal having a reference period of 10 ms, and takes a value of −5,000.00 μs to 4,999.99 μs. If the frame timing value is a positive value, it indicates that the reception timing of the CC is delayed from the reference 10 ms period signal. If the frame timing value is a negative value, the reception timing of the CC is Indicates that the signal is faster than the standard 10 ms period signal.

  FIG. 3 is a diagram illustrating a display example of the frame timing of the measurement result. In FIG. 3, a measurement condition display unit 101 displays the condition of a radio signal that is a CC to be measured, which is set as the measurement condition. In the measurement condition display unit 101, “Fn” indicates a number for identifying the set wireless signal condition.

  “MHz” indicates the center frequency of the radio signal to be measured. “BW” indicates the frequency bandwidth of the radio signal to be measured. “N” indicates the number of measurable PCI (Physical Cell Identity). PCI is a physical identification number of CC, and a different value is set for each base station 2.

  In FIG. 3, a frame timing display unit 103 and an enlarged display unit 104 are displayed on the graph display unit 102.

  The horizontal axis of the frame timing display unit 103 displays the frame timing of the radio signal between −5,000.00 μs and 4,999.99 μs centering on the reference 10 ms signal. The vertical axis of the frame timing display unit 103 indicates the RSRP reception level of the radio signal.

  The enlarged display unit 104 has a frame timing of −250 μs to +250 μs centered around the frame timing selected by the marker 105 (hereinafter also referred to as “reference timing”) among the frame timings of the radio signal displayed on the frame timing display unit 103. The frame timing of the radio signal between them is displayed. The marker 105 can be moved left and right on the graph by operating, for example, a rotary knob of the input unit 121.

  In FIG. 3, the marker display unit 106 displays information on the reception signal selected by the marker 105 or the reception signal at the frame timing closest to the marker 105.

  “F1” of the marker display unit 106 indicates that the signal is set by “1:” of “Fn” of the measurement condition display unit 101. “PCI” indicates the PCI of the received signal by a number from 0 to 503. PCI is a physical identification number of CC, and a different value is set for each base station 2.

  In FIG. 3, a list display unit 107 displays information on received radio signals in a list. “No.” is a number assigned to the radio signal in the rearranged order. “Fn” indicates “Fn” of the measurement condition display unit 101. “PCI” indicates the PCI of the received signal. “RSRP”, “RSRQ”, “SIR”, and “RSSI” indicate measured values of RSRP, RSRQ, SIR, and RSSI.

  “Timing (μs)” indicates a frame timing value of the radio signal. “Δt (μs)” indicates a difference in frame timing from the reference timing selected by the marker 105.

  Various display methods of the list display unit 107 are prepared, and one is selected and displayed by an operation input to the input unit 121.

  The search order display is displayed in the order of detected radio signals. Since the higher reception level is easier to detect after the measurement starts, the display will be the same as the level order, but the measurement value of the same radio signal will continue to be displayed at the same position even if the measurement point moves and the reception level changes .

  When the search order display is selected, the control unit 13 creates a list by rearranging the numbers assigned in the detected order, and causes the display unit 122 to display the list.

  The level order display is rearranged and displayed according to the measurement result selected by the operation input to the input unit 121 from RSRP, RSRQ, SIR, RSSI. The list order changes frequently, but it is easy to see which radio signal has the highest level at each measurement point.

  When the level order display is selected, the control unit 13 creates a list by rearranging the measurement values of the measurement items selected by the input unit 121 and causes the display unit 122 to display the list.

  The PCI order display is displayed in the order of PCI values being measured. The list order does not change until a new PCI radio signal is detected or a radio signal under measurement is no longer detected.

  When the PCI order display is selected, the control unit 13 creates a list by rearranging according to the PCI value of the measurement result, and causes the display unit 122 to display the list.

  When it is desired to simultaneously check the radio signal performing carrier aggregation on the list display unit 107, the above three display methods cannot satisfy this requirement.

  In carrier aggregation, since carrier aggregation is performed between a plurality of carrier frequencies, rearrangement beyond the measurement frequency (frequency set by “Fn”) must be performed.

  For this reason, in this embodiment, a timing order display is performed in which the list is displayed in the order of frame timing values regardless of the measurement frequency. By doing in this way, the radio signal performing the carrier aggregation is displayed together.

  When displaying in the order of timing, the control unit 13 creates a list by rearranging the frame timing values of the measurement results, and causes the display unit 122 to display the list. The list display unit 107 in FIG. 3 shows the case of timing order display. “No.” No. 7 and thereafter is radio signal data synchronized by carrier aggregation.

  In the case of such timing order display, the list order is not changed while measurement is performed in one place, but as the measurement point is moved, radio signals not related to carrier aggregation are detected. Or the wireless signal being measured may not be detected.

  In the display on the list display unit 107 in FIG. 3, if there is a radio signal that cannot be measured with No. 01 to No. 06, the list moves up. On the other hand, if a radio signal not related to carrier aggregation is detected and the frame timing is earlier than 07, the list moves down. When such movement increases, the list of radio signals synchronized by carrier aggregation is removed from the list display unit 107 and cannot be seen.

  Since the list display unit 107 can be scrolled by the operation of the input unit 121 to change the display position, it is possible to make the wireless signal synchronized with the carrier aggregation visible, but the movement of the measurement point Accordingly, it is impossible to confirm how the frame timing value changes unless the screen is continuously scrolled.

  Therefore, in the present embodiment, the timing Δ order display is performed in which the list is displayed in ascending order of absolute value of the difference in frame timing from the reference timing selected by the marker 105. By doing in this way, even if it moves a measurement point, the radio signal which is carrying out the carrier aggregation is displayed together.

  When displaying in the order of timing Δ, the control unit 13 calculates a difference between the frame timing value of the measurement result and the reference timing selected by the marker 105, creates a list by rearranging the absolute values in ascending order, and displays the list. 122 is displayed.

  FIG. 4A shows an example of timing order display, in which radio signals corresponding to carrier aggregation are listed from the 07th.

  Here, when the marker 105 is moved to the vicinity of the frame timing value of the radio signal corresponding to carrier aggregation and is switched to the timing Δ order display, as shown in FIG. 4B, the radio signal corresponding to carrier aggregation is No. 01. Will be displayed.

  Since the frame timing value of the radio signal does not change greatly even if the measurement point is moved, the radio signal corresponding to the carrier aggregation is always displayed from the number 01.

  As described above, the above-described embodiment includes the control unit 13 that displays a list of wireless signal information in ascending order of the absolute value of the difference between the reference timing and the frame timing.

  As a result, radio signals having frame timings that are close to the reference timing are displayed together, and a shift in reception timing can be easily confirmed.

  In addition, the control unit 13 changes the reference timing by an operation input to the input unit 121 and displays the radio signal information as a list.

  As a result, the target radio signal can be displayed at the top of the list display by changing the reference timing, and a shift in reception timing can be easily confirmed.

  Further, the control unit 13 causes the display unit 122 to display a graph indicating the difference between the frame timing of the radio signal and the reference timing.

  As a result, a difference from the reference timing can be easily visually confirmed, and a shift in reception timing can be easily confirmed.

  Moreover, the control part 13 moves the reference | standard timing on a graph by the operation input to the input part 121, and changes a reference | standard timing according to the said movement.

  As a result, the reference timing can be easily changed to the intended reception timing visually, and a shift in reception timing can be easily confirmed.

  While embodiments of the invention have been disclosed, it will be apparent to those skilled in the art that changes may be made without departing from the scope of the invention. All such modifications and equivalents are intended to be included in the following claims.

DESCRIPTION OF SYMBOLS 1 Radio wave propagation measuring apparatus 2 Base station 10 Wireless signal processing part 11 Wireless signal measuring part 12 User interface part 13 Control part 14 GPS receiving part 15 Internal clock 16 Antenna 121 Input part 122 Display part

Claims (5)

A radio wave propagation measuring device (1) for measuring a propagation state of a radio signal from a base station (2),
A display unit (122) for displaying an image;
A control unit (13) for displaying the measurement result of the radio signal on the display unit,
When the control unit displays the reception timing of the radio signal, the radio wave propagation measurement device displays a list of the information of the radio signal in order of a difference from a preset reference timing. An input unit (121) for receiving an operation input;
The radio wave propagation measuring apparatus according to claim 1, wherein the control unit changes the reference timing by an operation input to the input unit.   The radio wave propagation measuring apparatus according to claim 2, wherein the control unit displays a graph indicating a difference between the reception timing of the radio signal and the reference timing on the display unit.   The radio wave propagation measurement apparatus according to claim 3, wherein the control unit moves the reference timing on the graph by an operation input to the input unit, and changes the reference timing according to the movement. A reception timing display method of a radio wave propagation measuring device (1) for measuring a propagation state of a radio signal from a base station (2),
Calculating reception timing of the received radio signal;
Calculating a difference between a preset reference timing and the reception timing;
Displaying the wireless signal information in a list in the order of the difference from the reference timing.

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