JP3012771B2 - Radio wave measurement device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication system such as a simple portable telephone system (Personal Handy Phone System, hereinafter abbreviated as PHS) or the like, in which a mobile station receives radio waves transmitted from each base station. The present invention relates to a radio wave measuring device for evaluating whether or not the radio wave has the quality required for performing the measurement.

More specifically, a base station of a PHS emits a burst signal having an ON area and an OFF area in one cycle, and a burst signal carrying various data for transmission in the ON area. Moreover, each base station may output to the mobile station a time-division burst signal whose carrier frequency is the same and whose time is shifted so that at least the ON regions do not overlap each other.

In order for such a PHS to function sufficiently, it is necessary to investigate whether or not the radio wave environment required for the mobile station to function sufficiently at each point within the communication service range.

According to the present invention, when the radio wave environment is evaluated, the intensity of the radio wave at each point and the influence of the surrounding environment at the point which cannot be determined only by the intensity, particularly the influence of the multiple reflection, can be quantitatively determined. It relates to a radio wave measuring device.

[0005]

2. Description of the Related Art In a PHS, the range covered by one base station is relatively small. Therefore, each base station is installed relatively adjacent to each other. FIG. 11 shows each base station 1a,
It is a figure which shows the positional relationship of 1b, 1c, 1d, 1e and the communication service range. When each of the mobile stations 2a and 2b enters this communication service range, the mobile stations 2a and 2b move to the nearest base station 1.
It is possible to communicate with the other party via e and 1b.

[0006] As shown in FIG. 12, each of the base stations 1a to 1e transmits downlink signals a1, a2, a3, a4,
a5 is transmitted by radio wave. Each of the downlink signals a1 to a5 has a burst signal b1 repeated at a fixed period T1.
b2,..., b5 (all are ON areas). The burst signals b1 to b5 are time-divided and emitted in a time-division manner so that the radio waves of the downlink signals a1 to a5 do not interfere with each other in the air.

On the other hand, each burst signal b included in each of the downlink signals a1 to a5 radiated from each of the base stations 1a to 1e.
Digital data to be transmitted are mounted in 1 to b5. FIG. 6 shows a bit configuration example of a transmission frame forming the digital data.

A 4-bit ramp bit R is set at the head, a 2-bit start symbol SS is set second, a 62-bit preamble bit PR is set third, and a 32-bit unique word UW is set fourth. , And a 5-bit channel type CI is set fifth. Sixth, a 42-bit calling identification code is set as information necessary for specifying a base station (hereinafter, referred to as base station information), and 62-bit I [BCCH (A)] is set. , 16 bits of error correction bits (or check bits).

Of these data, the 32-bit unique word UW has a bit arrangement common to all burst signals b1 to b5. Therefore, when this bit arrangement is detected in the received digital data signal e,
The time position of the transmission frame is specified. The base station information for specifying the transmission source base stations 1a to 1e of the burst signals b1 to b5 is set in the 42-bit transmission identification code. A 62-bit I [BCCH] has a logical control channel (L
CCH) Interval value is set.

A carrier wave is subjected to quadrature phase modulation (QPSK) by a digital data signal e composed of such a bit-structured transmission frame, and radio waves are radiated from each of the base stations 1a to 1e as burst signals b1 to b5. .

In such a PHS, a plurality of base stations 1a
To 1e of the communication service area P1, P2, P3,
, PN, burst signals b1 to b5 of downlink signals a1 to a5 radiated from base stations 1a to 1e.
It is necessary to test in advance whether the mobile station can receive the data normally.

In such a test, each of the measurement points P1 to PN
A radio wave measuring apparatus for receiving each burst signal b1 to b5 radiated from each of the base stations 1a to 1e and measuring the received signal level to judge the quality of the radio wave state has been proposed.

[0013]

However, in the conventional radio wave measuring device, the received signals received by the radio wave measuring device at the same frequency include the time-divided burst signals b1 to b5 shown in FIG. included. Therefore, even if each signal level of each of the burst signals b1 to b5 is measured, the measurement position (measurement work site) P1 to P1 to which the base station 1a to 1e outputs each signal level is a burst signal. Not immediately available on PN.

The signal level of each of the burst signals b1 to b5 obtained at each of the measurement positions P1 to PN largely depends on the distance to the transmission source base station of the burst signal corresponding to the signal level and the surrounding environment of the measurement position. Dependent. For example,
Even if the signal level is sufficient for reception by the mobile station, the transmission content may not be recognized due to multiple interference by surrounding buildings and the like. Therefore, as a measuring instrument,
It is desirable that the quality of the actual radio wave can be determined as well as the level determination at the measurement position, and the next investigation or countermeasure can be performed.

The present invention has been made in view of such circumstances, and measures the signal level of a burst signal and reads base station information corresponding to the burst signal to immediately transmit each burst signal. By being able to identify the source base station and quantitatively assessing burst signal errors and understanding the actual quality of the radio waves, it is possible to identify some causes of abnormalities at the measurement work site. It is an object of the present invention to provide a radio wave measuring device as described above.

[0016]

In order to solve the above-mentioned problems, the present invention has the following arrangement.

(1) The timing generator outputs the timing synchronized with the burst waveform of the radio wave, the level measuring unit measures the level of the radio wave based on the timing signal, and the information detector detects the digital data included in the burst signal. , Base station information necessary for specifying the base station is extracted.

(2) The determining unit determines whether various digital data included in the burst signal is valid.

(3) The data processing section outputs the measurement level measured by the level measuring section and the judgment result of the judging section corresponding to the base station information for specifying the base station extracted by the information detecting section.

Further, in the present invention, in order to quantitatively determine the influence of multiplex interference or the like, a calculation unit for determining the burst error rate t in the measurement time can be provided.

For example, as a burst error determined by the arithmetic unit, the theoretical number r of burst signals within the set measurement time (measurement time and burst repetition time are known), bursts that cannot be synchronized by the timing generation unit Assuming that the number p1 (the number of bit errors) and the number p2 of bursts that the determination unit has determined to be an error, the burst error rate t can be obtained by the following equation (1).

T = [r− (p1 + p2)] / r (1) The main configuration of a specific example of each unit will be described below.

A) Input unit: The received signal received by the antenna is converted to a low frequency by a frequency converter, and the demodulator demodulates it into digital data before transmission.

B) Information extraction unit: after demodulation by a demodulator,
The descrambling circuit removes the scramble applied to the digital data, and the data extracting unit extracts various data (particularly, data after the calling identification code in FIG. 6).

(C) Timing generator: a synchronous frame detector receives unscrambled data (for example, a 32-bit unique word UW) among the data demodulated by the demodulator and stores the data in advance. And outputs a synchronization detection signal when they match. If they do not match, a bit error has occurred and no synchronization detection signal is output. The time control means outputs a timing signal required by each unit based on the synchronization detection signal.

D) Information extraction unit: after demodulation by the demodulator,
The descrambling circuit removes the scramble applied to the digital data, and the data extraction unit extracts various data (particularly, data after the calling identification code in FIG. 6) at the timing of the second timing signal.

E) Judgment unit: As a specific example, a CRC for various digital data included in a burst signal
(Cyclic code) This can be performed by judging an error.

F) Level detector: After amplifying the received signal and performing envelope detection, the level is detected at the timing of the first timing signal.

G ) Data processing unit: data memory and operation
Receiving a third timing signal and measuring the level.
Judgment section among each level of measured radio wave
Each level of the measured radio wave determined to be effective is recorded in the data memory.
And read the data from the memory
Using each level to calculate the burst error rate,
The level of the measured radio wave, its time change, and the berth
Error rate in combination with base station information based on
Format and output.

It is to be noted that a display unit may be provided and processed into various display formats in the data processing unit and displayed on the display unit as data that can be easily judged by the operator.

[0031]

In the radio wave measuring apparatus thus constructed, a burst signal which is time-divisionally radiated from each base station and radiated from the base station is received, and a timing generator generates timing synchronized with the burst. Since the level measurement unit, the information detection unit, and the determination unit operate based on the timing, the measured level of the burst signal at a certain timing and the validity of the digital data can be tested in association with the base station that emitted the burst signal.

Further, since the validity of the digital data is also determined, it is possible to evaluate a substantial radio wave quality including multiple interference at the measurement position which cannot be determined only by the radio wave level.

[0033]

An embodiment of the present invention will be described below with reference to the drawings.

The transmission frame shown in FIG. 6, the communication service range shown in FIG. 11, and the waveform of each downlink signal of each base station shown in FIG. 12 are as described in the section of the prior art.

FIG. 1 is a block diagram showing a schematic configuration of the radio wave measuring apparatus of the embodiment. In FIG. 1, control or data exchange between other main units via the operation unit 23 and the control unit 25 is indicated by two lines, and signals required between the main units are particularly necessary for understanding the present invention. , Data or timing signal flows are indicated by a single line.

The radio wave measuring device of the embodiment shown in FIG.
Each of the positions P1, P2, P3,..., PN within the communication service range covered by the plurality of base stations 1a to 1e shown in FIG.
In, while measuring the level of the burst signal radiated from the designated base station, calculate the burst error rate t defined by the above equation (1), the level of the radio wave radiated from the designated base station The value and the burst error rate t are both output and displayed.

The measurer can evaluate and judge the quality of the radio wave radiated from the designated base station at each of the positions P1, P2, P3,..., PN based on the output and the displayed value.

The specific configuration of the radio wave measuring apparatus shown in FIG. 1 and the operation until the level of a burst signal radiated from a designated base station is measured and the burst error rate t is calculated and displayed will be described below. I do.

The operation unit 23 is composed of keys and knobs on a panel of the apparatus. The operator can use the operation unit 23 to
The "measurement time" and the "base station identification number" and the "reception frequency" of the base station transmitting the radio wave to be evaluated are specified and input.

The "measurement time" set value means a time width for receiving and measuring the burst signal radiated from the designated base station, and is larger than the burst repetition period T1 as shown as T0 in FIG. The "base station identification number" is information corresponding to the sixth 42-bit calling identification code on the transmission frame constituting the burst signal in FIG. 6 as base station information. “Reception frequency” is the carrier frequency of the radio wave radiated from the designated base station.

The control unit 25 includes a CPU, a ROM, and a RAM.
The “reception frequency” set by the operation unit 23 is set to the input unit 100, and the “measurement time” and the “base station identification number” are set to the data processing unit 500. And this operation unit 23
Upon receiving a signal from the setting end key, the main part starts measurement.

In the receiving unit 100, each burst signal b1, radiated from each of the base stations 1a to 1e shown in FIG.
b2,..., b5 are transmitted through the antenna 5 to the frequency conversion circuit 7
Only the burst signal having a frequency corresponding to the “reception frequency” input from the operation unit 23 is selected, frequency-converted to a low frequency suitable for signal analysis, and output to the demodulator 8.

The demodulator 8 demodulates the frequency-converted burst signal of the base station into each digital data signal e having no RF component by using the clock signal c output from the internal clock oscillator 9 and outputs the next internal clock. It is sent to the synchronous circuit 10.

The same frequency conversion circuit 7, demodulator 8, and descrambling circuit 12 in the information detection section 300 of the receiving section 100 as those of the mobile station receiving the communication service can be used. For example, a commercially available IC can be used for the demodulator.

The internal clock synchronization circuit 10 of the timing signal generator 200 synchronizes the input digital data signal e with the clock signal c output from the internal clock oscillator 9. The clock-synchronized digital data signal e is
The signal is input to the descrambling circuit 12 and also to the frame synchronization detector 11.

The frame synchronization detecting section 11 includes a 32-stage shift register having the same number of bits of the unique word UW and 3
It has a memory for storing the bit pattern of the 2-bit unique word UW. Then, the frame synchronization detecting section 11 inputs each bit data of the digital data signal e to the first register of the shift register and shifts it sequentially to each subsequent register. Then, at the timing when the bit pattern stored in each of the 32 registers in the shift register matches the bit pattern stored in the memory, the synchronization detection signal g is sent to the next time control circuit 13 as shown in FIG. I do.

When the bit patterns do not match, the synchronization detection signal g, which is the timing signal, is not transmitted.

The time control circuit 13 calculates the CI 4 in the transmission frame of FIG. 6 from the time when the synchronization detection signal g is input.
After a lapse of time corresponding to the bit, an operation start timing signal h1 is sent to the descrambling circuit 12. When the operation start timing signal h1 is input, the descrambling circuit 12 descrambles the scramble set in the 120 bits after the 42-bit source identification code in the digital data signal e, and returns to a data string that can be immediately decoded. .

If necessary, the time required for descrambling is delayed, and after descrambling, the digital data signal e is sent to the next data extraction unit 14 and CRC error detection unit 22. When the synchronization detection signal g is not transmitted from the frame synchronization detection unit 11, the descrambling operation is not executed in the descrambling circuit 12 as a matter of course.

As shown in FIG. 6, the time control circuit 13 starts the data extraction after a lapse of a time T3 obtained by adding the time corresponding to the 4 bits of CI and the time required for descrambling from the input time of the synchronization detection signal g. Timing signal h2
(A second timing signal) and a CRC error detection start timing signal h8 obtained by adding the synchronization detection signal g and the data extraction start timing signal h2. When the synchronization detection signal g is not transmitted from the frame synchronization detection unit 11,
The time control circuit 13 does not naturally output the data extraction start timing signal h2 and the CRC error rate detection start timing signal h8.

As shown in FIG. 6, when the data extraction start timing signal h2 is input, the data extraction unit 14 of the information detection unit 300 converts the 42 bits of the calling identification code in the digital data signal e into the base station number DN. And an 8-bit LCCH interval ID3 is read from I [BCCH].
That is, a 42-bit serial base station number DN of the calling identification code and an 8-bit serial LCCH interval ID
3 is extracted and applied to the first and second input terminals of the next data memory 15 as an n-bit parallel base station number DN and an LCCH interval value D3, respectively.

The CRC error detection unit 22 outputs the synchronization detection signal g
When the CRC error detection start timing signal h6 generated by adding the data extraction start timing signal h2 to the cyclic code CRC application region of the digital data signal e (in this example, the descrambled digital (Range of data) is encoded by CRC. Thereafter, the data is compared with the CRC bits shown in FIG. 6, that is, the 16-bit check bits, and the error determination data D2 is applied to the third input terminal of the data memory 15. The comparison with the 16-bit check bit employs the same method as the unique word UW detection means in the frame synchronization detection unit 11.

Further, the time control circuit 13 sends a level detection timing signal h3 to the level detection section 18 in synchronization with the clock signal c from the internal clock oscillator 9.

On the other hand, the received signal b output from the frequency converter 7 is input to the demodulator 8 and logarithmically converted by a logarithmic amplifier (LOG amplifier) 16. The logarithmically converted received signal b is envelope-detected by the next envelope detector 17. The detection signal i detected by the envelope detection is supplied to the next level detection unit 1.
8 is input.

As shown in FIG. 5, the level detecting section 18
The level detection timing signal h3 from the time control circuit 13
In response to the input of the (first timing signal), the signal level D1 of the detection signal i subjected to the envelope detection is detected. The level detector 18 applies the detected signal level D1 to the fourth input terminal of the data memory 15 as n-bit parallel data.

The time control circuit 13 supplies a base station number DN and an LCCH interval value D to each input terminal of the data memory 15.
3. A write signal h5 for writing the base station number DN and the LCCH interval value D3 in the data memory 15 and a write signal for writing the signal level D1 at the timing when the signal level D1 and the CRC error determination data D2 are applied. h
6 (third timing signal) and a write signal h7 for writing the CRC error determination data D2. Also,
After the elapse of the measurement time, the time control circuit 13 sends to the control operation unit 20 a transfer timing signal h4 for permitting the data in the data memory 15 to be transferred to the data output control unit 20 in the data processing unit 19.

The write signal h6 for writing the signal level D1 sent from the time control circuit 13 is not sent if the synchronization detection signal g sent from the frame synchronization detection unit 11 is not sent. That is, when the unique word UW of the digital data signal e does not match the bit pattern stored in the memory of the frame synchronization detecting section 11, the write signal h6 for writing the signal level D1 is not sent out. Signal level D1 to memory 15
Will not be remembered.

In this case, base station number DN, LCCH
The interval value D3 and the CRC error determination data D2 are not stored in the data memory 15.

As described above, the fact that the unique word UW of the digital data signal e and the bit pattern stored in the memory of the frame synchronization detecting section 11 do not match indicates that the designated base station radiates radio waves into the air. This means that some trouble has occurred in the process of the burst signal arriving at the antenna 5. Then, the failed burst signal is not stored in the data memory 15 as data.

The data processing section 500 is constituted by a CPU including a RAM and a ROM. As a functional block, the data memory 15 described above, an arithmetic unit 19 for processing data from the data memory as desired, and a display for displaying data from the data memory 15 and data calculated by the arithmetic unit 19 in a desired format. Display memory 21 for storing data and data output control unit 2 for controlling them
0.

After completion of the measurement, upon receiving the above-mentioned transfer timing signal h4, the data output control unit 20 determines that the "base station identification number" input from the operation unit 23 matches the base station number DN in the data memory 15. Then, a signal level D1 in which no error has occurred in the CRC error determination data D2 is extracted.

Each of the "average value processing", "median value processing", "maximum value processing" or "minimum value processing" is executed for the extracted signal level D1 in the measurement time, and one or more of them are processed. Is displayed on the display 24 together with the corresponding base station number DN as a representative value at the measurement position and the measurement time.

The value displayed on the display 24 is
In the burst signal radiated from the base station corresponding to the "base station identification number" input in step 2, the burst signal level processing value which has not been disturbed in the process of arriving at the antenna 5 within the "measurement time" means.

The data output control unit 20 is provided with the arithmetic unit 1
9 sends out the data read from the data memory and causes the following calculation of the burst error rate. Data memory 15
The number of extracted signal levels D1 is the number of burst signals that have passed the unique word detection and CRC error determination in the frame synchronization detection unit 11 without any problem. That is, the burst signal radiated from the designated base station is
Is the number p of burst signals that could arrive without any trouble in the process up to arrival.

On the other hand, the “measurement time” set on the operation unit 23
The number r of burst signals arriving at the antenna 5 from the designated base station in the data memory 15 is the LCCH interval value D in the data memory 15.
From Equation 3, it can be calculated by the following equations. The time of 5 ms shown in the equation (2) is a time defined in a certain PHS system. Therefore, 5 ms × D3 corresponds to the repetition period of the burst signal.

R = (measurement time) / (5 ms × D3) (2) From the number p, r of each burst signal, in the process until the burst signal radiated from the designated base station reaches the antenna 5 The number s of the failed burst signals can be expressed by equation (3).

S = r−p (3) The newly defined burst error rate t is calculated by the equation (4) from the calculation results of the numbers r and s of the burst signals.

T = s / r (4) The burst error rate t calculated by the equation (4) is obtained by the output data control unit 20 from the display memory 21 in accordance with the designation from the operation unit 23. The format is read and displayed on the display 24 together with the level measurement value D1 and the corresponding base station number DN. Fig. 9 shows a display example
Shown in

Next, an example of a process in which a measurer evaluates and determines the radio wave quality from the level measurement value and the burst error rate measurement value measured by the radio wave measuring apparatus will be described.

The measurer has in advance a judgment reference value for evaluating the level measurement value and the burst error rate measurement value of the radio wave measuring device in order to judge the radio wave quality at the measurement point. Then, the measurer can create the following pass / fail judgment matrix table based on whether or not the level measurement value and the burst error rate measurement value of the radio wave measurement device satisfy the judgment reference value.

[0071]

[Table 1] In case of the pass / fail judgment result of the pass / fail judgment matrix table, in case 1, both the level measurement value and the burst error rate measurement value satisfy the judgment reference values determined by the operator. That is, in case 1, the measurer determines that there is no problem in radio wave quality.

On the other hand, in case 2, the measured level value satisfies the criterion value, but the measured burst error rate does not satisfy the criterion value. In such a case, it means that the burst signal radiated from the designated base station into the air has received some trouble in the course of reaching the antenna 5. Based on this result, the measurer determines that there is a problem due to the influence of multiple interference waves on the radio wave quality.

Further, in case 3 and case 4,
Since the level measurement value does not satisfy the determination reference value, the measurer determines that there is a problem in radio wave quality. In some cases, the base station installation may be reviewed in consideration of the distance from the base station and surrounding buildings.

The data output control unit 20 controls a display memory 21 storing data necessary for various displays as shown in FIG. 2, and is constituted by a liquid crystal display device or the like in a desired format in which data can be easily analyzed. It is displayed on the display 24.

In the display memory 21, a display mode memory 21c for storing a display mode set by the operator via the operation section 23, a measurement position memory 21d, a data processing mode memory 21a, a base station number memory 21b, a data file 21e and display format memory 21f
Etc. are formed.

There are two types of display modes that can be selected by the operator on the radio wave measuring apparatus, namely, a "time axis display mode" and a "processing result display mode". In the "processing result display mode", Regarding the display order of signal level,
"Reception order", "signal level order", "base station number order",
There are four types of “designated base station order”. In addition, there are two types of display modes, “graph display” and “numerical display”.

There are three types of data processing modes designated by the operator via the operation unit 23 and set in the data processing mode memory 21a: "average value processing", "median value processing", and "maximum value processing". Is set.

The display format memory 21f stores display formats for controlling the display unit 24 corresponding to each display mode described above.

In the measurement position memory 21d, the current measurement positions P1, P2,.
.., PN are input.

The data output control unit 20, which has received the above-mentioned transfer timing signal h4,
The display mode is read from the display mode memory 21c, and in the time axis display mode, the contents of the data memory 15 are transferred to the data file 21e. In the case of the processing result display mode, the data processing mode is read from the data processing mode memory 21a, and the signal level DL and the base station number DN after data processing are transferred to the data file 21e according to the processing mode.

In the output data control unit 20, the arithmetic unit 19 performs all the data processing.
, B5 received from each of the burst signals b1, b2,.
Level L1. L2. ..., L5 is determined. In particular,
The signal level DI is averaged between each burst.

The output data control section control section 20 determines whether or not the signal level DI to be averaged in each burst among the signal levels DI written in the data memory 15.
The determination is made based on the relative position (address) relationship between the base station number DN written in the data memory 15 and the signal level DI.

In the case of the average value processing, the output data control unit 20 obtains an average value DL for each base station for each burst signal level L1, L2,..., L5 at the specified time T0 in the received signal b of FIG. . Further, in the case of the median value processing, the median value DL is obtained for each base station, and in the maximum value processing, the maximum value DL is obtained for each base station.

In the processing result display mode, the output data control section 20 stores the signal level DL after data processing for each base station and each base station number DN in the data file 21e.
Transfer to

The output data control section 20 of the data processing section 19 outputs the signal level DI of each of the burst signals b1 to b5 detected by the level detection section 18 and the data extraction section 14 in accordance with the flow charts shown in FIGS. The program is configured to execute data processing and display processing based on the base station number DN of each of the extracted burst signals b1 to b5.

When the transfer timing signal h4 is input from the time control circuit 13 in P (program step) 1 in the flow chart, the display mode selected by the operator is read from the display mode memory 21c (P2). .

In P3, when the display mode is the time axis display mode, the contents of the data memory 15 are written to the data file 21e and stored (P4). In P5, if the base station number is not set in the base station number memory 20b provided to enable display from an arbitrary base station number DN, the setting display mode stored in the display mode memory 21c is used. Are displayed on the display 24 on the time axis on the display 24 in the order of reception using the display format corresponding to (P24).

In P5, the base station number memory 2
If the base station number is set to 0b via the operation unit 23, the time axis is displayed in the order in which the set base station number is received from the point where it was received (P25). The measurement position P stored in the measurement position memory 20d is also displayed at the same time.

In P3, if the display mode is not the time axis display mode, it is determined that the display mode is the processing result display mode, and the program proceeds to P6. In P6, when the data processing mode is the average value processing, the specified time T0 (≦
An average value DL of the burst signal level is determined for each base station within the measurement time (P7). In P8, when the data processing is the median processing, the median DL of the burst signal level is determined for each base station within the specified time T0 (P9).

In P8, if the data processing is not the median value processing, it is determined that the processing is the maximum value processing, and the maximum value DL of the burst signal level is determined for each base station within the specified time T0.
(P10).

In P11, the base station number DN of each base station and the value DL after data processing for each base station are written in the data file 21e.

In P12 in FIG. 4, when the display mode is "signal level order", the measured data after data processing for each base station is rearranged in order of signal level DL (P13). Also, in P14, when the display mode is “base station number order”, the measurement data after the data processing is rearranged in ascending order of the base station number DN (P1).
5). Furthermore, in P16, when the display mode is “designated base station order”, each measurement data after data processing is
The order is rearranged in the order of the base stations designated by the operator via the operation unit 23 (P17).

Further, in P16, if the display mode is not "designated base station order", it is determined that the display mode is the normal "reception order", and the measured data after data processing is arranged in the reception order (P18). .

If the base station number is specified in P19, the process proceeds to P20, and only the data of the fixed base station number in the arranged data is left. In P19, if the base station number has not been avoided, the process proceeds to P21.

Next, in P21, it is determined whether the display mode is "graph display" or "numerical display". In the case of "numerical value display", the process proceeds to P22, and the respective measurement data (DL, DL) are displayed in the order of arrangement using the display format corresponding to the setting display mode stored in the display mode memory 25.
DN) is displayed on the display 24. In this case, the measurement position P stored in the measurement position memory 21d is also displayed.

FIG. 8A shows an example of the display contents of the display 24 in the normal "reception order" mode and the "numerical value display" mode. In the order of each reception time number, the base station number DN
And the signal level DL. Are displayed simultaneously. The measurement position and frequency are also displayed.

If the display mode is "graph display" at P21 in the flowchart of FIG. 4, the process proceeds to P23, where the signal level DL is displayed.
Are displayed in a bar graph, and are displayed in a bar graph on the display 24 in the order of arrangement, and the base station number DN of the base station corresponding to the vicinity of the bar graph is displayed in characters.

FIG. 7 shows an example of the display contents of the display 24 in the time axis display. The signal level DL detected from the envelope-detected detection signal i shown in FIG. 5 at the timing of the level detection timing signal h3 is displayed in order of detection time, and the base station number DN is displayed. The measurement position and frequency are also displayed.

In FIG. 7, the horizontal axis represents the received signal d.
Is the time axis, and the vertical axis is the signal level (dB). Then, base station numbers 13569, 10503,... Corresponding to the burst signal waveform indicated by the signal level DI are displayed.

FIG. 10 shows the display contents of the display unit 24 when the display mode is "signal level order" and the display mode is "graph display". The signal level DL is represented by a bar graph 28, and each bar graph 28 is arranged and displayed in descending order of value.

FIG. 8B shows the display contents of the display unit 24 when the display mode is "base station number order" and the display mode is "graph display". Each signal level DL has a base station number 001, 002. 003... Are displayed in a bar graph 28 in order. Further, in this embodiment, the operator operates the operation unit 21 to specify a specific base station number DN (= 002).
, The bar graph 29 of the corresponding base station number DN (= 002) is highlighted and the corresponding base station number DN (= 0
02) The signal level DL (= 40 dB) is displayed at the upper position of the screen.

In the radio wave measuring apparatus thus configured, the operator installs the radio wave measuring apparatus at one of the measurement positions P in the communication service range shown in FIG.
Is input via the operation unit 21. Next, a display mode and a display mode are set.

When the above-mentioned preparation work is completed and the measurement is started, each burst signal b1 from each of the base stations 1a to 1e is transmitted.
, b5 are received, and the signal level DI and the source base station number DN are detected.

In the processing result display mode, based on the detected signal level DL and the source base station number DN, the signal level D after data processing is performed in accordance with the data processing mode.
The source base station number DN corresponding to L is obtained, and each measurement data consisting of the signal level DL and the base station number DN is displayed on the display 24 collectively.

Therefore, the operator only looks at the display screen of the display unit 24, and only recognizes the signal level DL and the source base station 1 corresponding to the signal level DL.
a to 1e can be grasped immediately. Thus, each measurement position P
In each of the base stations 1a to 1e, a signal level DL is set for each base station from each of the mixed burst signals radiated from the base stations 1a to 1e.
By obtaining and displaying the values, the average value, median value, or maximum value of each base station in the measurement cycle can be grasped at the measurement position (measurement work site).

As shown in FIG. 7, by displaying the signal level DI on the time axis on the horizontal axis, for example, there is a reflected wave from the building 3 or the like (see FIG. 6), and a radio wave that has interfered with the direct wave is received. If so, the reception level waveform 30 is displayed in an abnormal manner. Also, the reception level waveform 30
Appears between the reception level waveforms 31 at other normal time axis positions depending on the position or the time, or is displayed in a state partially overlapping the normal reception level waveform 31.

Therefore, reflected radio waves and the like can be easily specified on the display screen, and the cause of the reception failure of the normal burst signal caused by the reflected radio waves can be relatively easily determined at the measurement work site. This is defined by the burst error rate and can be quantitatively determined. However, the display in FIG. 6 is intended to determine an abnormality such as multiple reflection from a waveform. Further, since the vertical axis indicates the signal level, it is possible to grasp at a glance the general signal level of the burst signal.

[0108]

As described above, in the radio wave measuring apparatus according to the present invention, a burst signal which is time-divisionally radiated from each base station and radiated from the base station is received, and the timing generator synchronizes the timing with the burst. Since the configuration is such that the level measurement unit, the information detection unit, and the determination unit operate based on the generated timing, the level of the burst signal at a certain timing , the time change of the level, and
The burst error rate and the validity of the digital data can be tested in association with the base station that emitted the burst signal. In addition, since the validity of the digital data is also determined, it is possible to evaluate the substantial quality of the radio wave including multiple interference and the like at the measurement position that cannot be determined only by the radio wave level.

Therefore, if the quality of the radio wave is abnormal as a result of the measurement, it is possible to analyze the cause of the abnormality to some extent at the measurement work site and perform the next measurement work, which is greatly efficient in evaluating the quality of the radio wave. Can be improved.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a schematic configuration of a radio wave measuring apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing storage contents of a display memory of the apparatus of the embodiment.

FIG. 3 is a flowchart showing the operation of the apparatus of the embodiment.

FIG. 4 is a flowchart showing the operation of the apparatus of the embodiment.

FIG. 5 is a time chart showing the operation of the apparatus of the embodiment.

FIG. 6 is a time chart showing the operation of the apparatus of the embodiment.

FIG. 7 is a diagram showing display contents of a display device in the apparatus of the embodiment.

FIG. 8 is a view showing display contents of a display device in the apparatus of the embodiment.

FIG. 9 is a view showing display contents of a display device in the apparatus of the embodiment.

FIG. 10 is a view showing display contents of a display device in the apparatus of the embodiment.

FIG. 11 is a diagram showing a call service area in the simplified mobile phone system;

FIG. 12 is a diagram showing each burst signal radiated from each base station.

[Explanation of symbols]

1a-1e: base station, 2a, 2b: mobile station, 3: building,
7: frequency converter, 8: demodulator, 9: internal clock oscillator, 10: internal clock synchronization circuit, 11: frame synchronization detection unit, 12: scramble descrambling circuit, 13: time control circuit, 14: data extraction unit, 15 ... Data memory, 16
... logarithmic amplifier, 17 ... envelope detector, 18 ... level detector, 19 ... data processing unit, 20 ... output data control unit, 2
1 display memory, 21a data processing mode memory, 21b base station number memory, 21c display mode memory, 21d measurement position memory, 21e data file, 21f display format memory, 22 CRC
Error detection unit, 23 operation unit, 24 display unit, 25 control unit, 28, 29 bar graph, 30, 31 reception waveform, 10
0: receiving unit, 200: timing generating unit, 300: information detecting unit, 400: level measuring unit, 500: data processing unit

Claims (1)

(57) [Claims] A receiving section (100) for receiving a radio wave to be measured having a burst waveform which is time-divisionally transmitted from each base station and includes a plurality of predetermined information including base station information indicating a transmitting base station and information necessary for transmission. ), The first and the second synchronized with the burst waveform received by the receiving unit .
Timing generator for generating and outputting a second and third timing signal (200), the level measurement unit for measuring the respective levels of the measured radio wave received by the reception unit receives the first timing signal (400 )
An information detection unit (300) that receives the second timing signal and extracts predetermined information included in the radio wave to be measured; and an effective unit for measuring the radio wave to be measured based on the predetermined information output from the information detection unit. A judgment unit (22) for judging the performance of each burst, a data memory (15), and a calculation unit (19);
Upon receiving an imaging signal, the
The determination unit determined that the level was effective among the respective levels of the measured radio wave.
Each level of the measured radio wave is stored in the data memory.
And read out from the data memory to the arithmetic unit.
Using each level to calculate the burst error rate,
The level of the measured radio wave, its time change, and the berth
Error rate in combination with the base station information based on
A radio wave measuring device including a data processing unit (500) for outputting in a predetermined format .