KR20060136281A - Method for measuring total isotropic sensitivity of terminal - Google Patents

Abstract

The present invention relates to a method for measuring a radiation reception performance of a terminal. In the related art, a measurement apparatus measures a reception signal strength satisfying a radiation BER while decreasing a transmission level at a 2 dB interval starting from a large level. If the difference in the received signal strength is large, there is a problem that the test time increases gradually. In view of the above problems, the present invention includes the steps of: calculating a difference between a transmission level value of a previous angle and a reception level value of a current angle in a measuring device; Outputting a low level wireless signal by the calculated difference; Measuring the transmission level value corresponding to the radiation error rate by lowering by a predetermined level from the level lowered by the difference, by using the information of the transmission level measured at the previous angle to adjust the transmission level of the current angle to output a radio signal By reducing the time taken to measure the transmission level at an angle and reducing the test time at various angles, the radiation reception performance of the terminal can be measured more quickly.

Description

Method for measuring radiation reception performance of a terminal {METHOD FOR MEASURING TOTAL ISOTROPIC SENSITIVITY OF TERMINAL}

1 is an exemplary view showing a characteristic curve of received signal strength for each direction of a terminal.

2 is an exemplary view of measuring the received signal strength level of the terminal for different antenna directions.

3 is an exemplary view illustrating a noise source induced by a terminal antenna.

4 is an exemplary diagram for measuring radiated BER and received signal strength levels for different antenna directions.

Figure 5 is an exemplary view showing a system configuration for measuring the radiation reception performance of a conventional terminal.

6 is a flowchart illustrating a method of measuring a radiation reception performance of a conventional terminal.

Figure 7 is an exemplary view showing a system configuration for measuring the radiation reception performance of the terminal for explaining the present invention.

8 is a flowchart illustrating a method of measuring a radiation reception performance of a terminal according to an exemplary embodiment of the present invention.

The present invention relates to a method for measuring radiation reception performance of a terminal, and more particularly, to a method for measuring radiation reception performance of a terminal, which makes it possible to shorten the time for measuring the radiation reception performance of a terminal.

Since the mobile communication terminal has different gains according to the direction of the antenna with respect to the base station, the received signal strength of each direction of the terminal has a different size due to the change of gain according to the direction of the antenna. That is, since the antenna of the mobile communication terminal has a different reception gain value according to the direction, the radiation characteristic is not uniform but varies depending on the surrounding direction.

The mobile communication terminal receives the signal transmitted by the measuring device, measures the level of the signal input to the antenna and reports it to the measuring device. The measuring device displays the measurement information received from the terminal on the screen. Know the reception level.

1 is a diagram illustrating a characteristic curve of received signal strength for each direction of a terminal.

Since the radiation gain of the terminal has a different gain according to the measurement direction, when the mobile communication terminal receives a radio signal through the antenna, the reception level of the terminal varies depending on the measurement direction and the received signal strength value varies from direction to direction.

The ideal terminal 11 represents the radiation gain 12 of the antenna uniformly, while the actual terminal 13 does not represent the radiation gain 14 uniformly but shows different radiation gains 14 depending on the direction. In the ideal terminal 11, since the received signal strength has the same level at all angles, the characteristic curve of the terminal has a constant value in all directions, but the actual terminal 13 has a different strength level for each direction.

In the actual terminal 13, when the radiation gain in the A direction is -10dBi, the radiation gain in the B direction is 0dBi, the output level of the radiation antenna is -60dBm, and the loss of the chamber is 30dB, the terminal for the A and B directions The received signal strength of is calculated as follows.

2 is an exemplary diagram of measuring a received signal strength level of a terminal for different antenna directions.

The received signal strength of the terminal 22 in the A direction is the transmit level of the measuring device (-60 dBm) + chamber loss (-30 dB) + antenna gain (-10 dBi) = -100 dBm and the reception of the terminal 24 in the B direction. The signal strength is the transmission level (-60dBm) + chamber loss (-30dB) + antenna gain (0dBi) = -90dBm of the measuring device. Since the antenna gains for the A and B directions are different from each other, the mobile communication terminal measures the received signal strength differently according to the direction and transmits the measured received signal strength to the measuring device 21.

3 is an exemplary view showing a source of noise 32 induced by the terminal antenna 31.

The radiated bit error rate (BER) of the terminal has the same value regardless of the measurement direction, and the radiated BER is the BER for the received signal strength displayed on the measurement equipment in the radiated state. Radiation reception sensitivity is a parameter considering signal error due to the reception level at which the radiation BER is 2.4% in the radiation state unlike the reception signal strength.

For example, the received signal strength is -105dBm to -104dBm in the measuring device in the radiated state, and the radiated BER is 1% at -104.5dBm when the BER is 1%. And if the received signal strength of the measuring device is -106dBm ~ -105dBm, and the BER is 2.4%, the radiation reception sensitivity is -105.5dBm.

4 illustrates an example of measuring radiated BER and received signal strength levels for different antenna directions.

In the mobile communication terminal, there may be several noise sources, but not one, but assume that the noise source has one predetermined level value, and assume that the noise source is induced into the antenna of the terminal regardless of the measurement direction.

In addition, if the noise source level is -100dBm, and the antenna gain in the noise source direction is -5dBi, the noise level induced by the antenna is -105dBm, the transmission level of the measuring device is -60dBm, and the signal-to-noise ratio is 5dB at BER. Assume 2.4%.

In the mobile communication terminal, the noise level is the same as -105dBm regardless of the direction of the terminal, and the signal emission level is different because the transmission level of the measuring device is the same according to the direction of the terminal but the gain according to the direction of the antenna of the terminal is different.

When the transmission level of the measuring device 41 in the terminal A 45 is -60 dBm, the received signal strength is the transmission level (-60 dBm) + chamber loss (-30 dB) + antenna gain (0 dBi) = -90 dBm. If the noise level is -110dBm, the signal-to-noise ratio is 5dB and the radiated BER is 2.4% when the transmit level is -75dBm and the received signal strength is -106 to -105dBm.

When the transmission level of the measuring device 41 in the terminal B 46 is -60 dBm, the received signal strength is the transmission level (-60 dBm) + chamber loss (-30 dB) + antenna gain (-10 dBi) = -100 dBm. If the noise level is -110dBm, the signal-to-noise ratio is 5dB and the radiated BER is 2.4% when the transmit level is -65dBm and the received signal strength is -106 to -105dBm.

The radiation reception sensitivity that satisfies the received signal strength vs. 2.4% BER shows the same level regardless of the antenna direction of the terminal, but since the antenna gain varies depending on the direction, the measuring device 41 adjusts the transmission level differently according to the antenna direction. Output

5 is an exemplary view showing a system configuration for measuring the radiation reception performance of a conventional terminal.

The measuring device 51 adjusts the radiation level to measure the reception performance of the terminal 52 and the external computer controls the measuring device 51. The measuring device 51 outputs a radio signal to the mobile communication terminal 52 by adjusting the transmission level differently with reference to the reception level of the terminal 52, and the mobile communication terminal 52 changes the antenna direction by rotating the table. To receive the radio signal output from the measuring device 51.

The mobile communication terminal 52 measures the strength of the received wireless signal and outputs the measured intensity to the measuring device 51. The measuring device 51 adjusts the transmission level with reference to the received signal strength of the terminal, stores the transmission strength value satisfying the BER 2.4% according to the direction, and transmits the measured transmission strength value for all directions to the TIS (Total Isotropic Sensitivity). Substitute the formula to get the TIS value.

6 is a flowchart illustrating a method of measuring a radiation reception performance of a conventional terminal.

The measuring device sets the radiation level to a relatively large level and outputs a radio signal to the mobile communication terminal. The mobile communication terminal receives the radio signal of the measuring device and calls the measuring device upon recognizing the signal.

After receiving the call, the measurement device first applies a radio signal to a high level and checks the reception characteristics of the terminal by lowering the signal level at 2 dB intervals. If the BER, which is a reception characteristic criterion of the terminal, exceeds 2.4%, the measurement device stores the previous transmission strength value as the reception strength value at the measurement angle.

The measuring device repeatedly rotates the turntable on which the terminal is placed to adjust the antenna direction of the terminal and to adjust the radiation level at a different measurement angle to measure the reception intensity value of the terminal.

The measurement apparatus measures the reception strength value of the terminal at all angles and obtains the TIS value by applying the measured transmission strength value to the TIS formula.

However, in the prior art as described above, since the measuring device measures the received signal strength satisfying the radiated BER while starting at a large level and decreasing the transmission level by 2 dB, the difference between the initial transmission level and the received signal strength, which is a measurement target value, is large. In this case, there is a problem that the test time increases gradually.

Accordingly, an object of the present invention is to provide a method for measuring radiation reception performance of a terminal to reduce a test time by outputting a radio signal by adjusting a transmission level close to a radiation BER. have.

The present invention for achieving the above object comprises the steps of calculating a difference between the transmission level value of the previous angle and the reception level value of the current angle in the measuring device; Outputting a low level wireless signal by the calculated difference; And measuring a transmission level value corresponding to a radiation error rate by decreasing a predetermined level from a level lowered by a difference.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

7 is an exemplary view showing a system configuration for measuring the radiation reception performance of the terminal for explaining the present invention.

The measuring device 70 outputs a radio signal by adjusting the radiation level to approach a reception level that satisfies BER 2.4%, and operates the turntable 90 to rotate the antenna direction of the terminal 80 and the terminal 80 at various angles. The received signal strength is measured and applied to the TIS formula to obtain the TIS value.

The measuring device 70 includes a radiation antenna 73 for outputting a radio signal; A radiation level adjuster 71 for adjusting a radiation level of the radio signal; And a signal strength receiver 72 for receiving the received signal strength value from the mobile communication terminal 80.

The radiating antenna 73 of the measuring device 70 outputs a radio signal to the mobile communication terminal 80, and the angles of the radiating antenna 73 and the terminal antenna differ depending on theta angle and pi angle. The radiating antenna 73 outputs a radio signal in accordance with the radiation level set at present, and at a predetermined angle, radiates a radio signal at a large level, but in the next step, the radiation is set to approach the received signal strength satisfying BER 2.4%. Outputs a radio signal according to the level.

The radiation level adjuster 71 controls the turntable 90 to rotate the direction of the antenna of the terminal and initially sets the radiation level of the radio signal large at any angle by rotation, and in the next step exceeds BER 2.4% at the previous angle. By calculating the difference between the previous transmission level value stored and the reception level measured at the next angle, the radiation level is set by the calculated difference, and then the radiation level is set by 1dB interval.

The signal strength receiver 72 receives the received signal strength value measured at the terminal 80 by the output of the radio signal at an arbitrary angle, stores the immediately previous transmission level value over BER 2.4% and is set large at the next angle. The reception level measured by the terminal 80 is checked by the radio signal of the radiation level, and the difference between the previous transmission level value and the reception level is calculated and transmitted to the radiation level regulator 71.

The turntable 90 rotates the mobile communication terminal 80 under the control of the measuring device 70 to adjust theta angle and pi angle by differently positioning the antenna direction of the terminal 80.

The mobile communication terminal 80 receives the radio signal of the measuring device 70, measures the received signal strength, calculates a BER for the received signal strength, and transmits the BER and the received signal strength to the measuring device 70.

The mobile communication terminal 80 includes a reception antenna for receiving a radio signal of the measuring device; A signal strength meter for measuring signal strength of a wireless signal; It consists of a BER calculator that calculates the BER for the received signal strength.

The receiving antenna of the mobile communication terminal 80 receives a radio signal at any angle according to theta angle and pi angle, and the signal strength meter measures the signal strength of the radio signal and transmits the signal to the measuring device 70. The BER calculator calculates the BER for the received signal strength and transfers the calculated BER to the measuring device 70.

The measurement device 70 receives the received signal strength and the BER from the mobile communication terminal 80 to measure the reception characteristics of the terminal 80 for any angle, and the radiation level to approach the received signal strength satisfying the BER 2.4%. The operation of outputting a wireless signal by measuring the measurement of the reception characteristics of the terminal 80 at various angles and calculating the TIS value is as follows.

FIG. 8 is a flowchart illustrating a method of measuring a radiation reception performance of a terminal according to an embodiment of the present invention. As shown in FIG. Storing a corresponding transmission level value; Controlling the turntable to rotate the mobile communication terminal and output a high level wireless signal; Measuring a reception level of the terminal and calculating a difference between the stored transmission level value and the measured reception level value at a previous angle; Lowering and outputting a high level wireless signal by a calculated difference; Measuring a reception level of the terminal, outputting a radio signal by lowering the radiation level at 1 dB intervals, and measuring a transmission level value corresponding to the radiation BER of the terminal; The TIS value is obtained by measuring a transmission level corresponding to the radiated BER of the terminal at various angles and applying the TIS formula.

Assume that the measurement device adjusts the radiation level of the radio signal to measure the reception characteristics of the terminal at various angles and calculates the TIS value.

The measuring device outputs a radio signal of a relatively large level to the mobile communication terminal to be measured, and the mobile communication terminal receives the wireless signal of the measuring device. When the mobile communication terminal recognizes the radio signal of the measuring device, it calls the measuring device.

After the call of the terminal, the measuring device first outputs a large level wireless signal and checks the reception characteristics of the terminal while lowering the signal level by 2 dB. The measurement device determines whether the BER of the terminal, which is a reception characteristic criterion, exceeds 2.4%, and if it exceeds, stores the transmission level value of the previous measurement device. The measuring device determines the stored transmission level value as the transmission level value at the current measurement angle and uses it to adjust the radiation level at the next angle.

The measuring device controls the turntable to rotate the mobile communication terminal and set the radiation level of the radio signal to a large level for the measurement of a transmission level value that satisfies the BER 2.4% of the terminal at the next angle.

The measuring device outputs a high level radio signal and measures the reception level of the terminal. The measuring device calculates a difference between the stored transmission level value and the measured reception level value at the previous angle.

The measuring device outputs a radio signal of a large level at the current angle and then lowers the signal level by the calculated difference without output signal reduction by 2 dB. That is, the measuring device outputs the radio signal by adjusting the radiation level so as to approach the reception level satisfying the BER 2.4% by lowering the radio signal of a large level by the calculated difference.

In another embodiment, the measurement apparatus measures the transmission level corresponding to the received signal strength that satisfies the BER 2.4% more accurately by applying an offset when the signal level of the radio signal is lowered by the calculated difference. The offset positions the signal level of the radio signal from a level higher than the transmission level to more accurately measure the transmission level, which is a measurement target.

The measurement apparatus measures the reception level of the terminal, outputs a radio signal by lowering the emission level by 1 dB interval, and measures the transmission level corresponding to the reception signal strength satisfying BER 2.4%.

The measuring device outputs a radio signal largely for the remaining angles, and then outputs a radio signal by lowering the radiation level by the difference between the stored transmission level value and the measured terminal reception level value at the previous angle, and then lowers the radiation level by 1 dB. The signal is output and the reception level of the terminal is measured to measure the transmission level corresponding to the received signal strength satisfying BER 2.4%.

The measuring device continuously adjusts the radiation level to approach a reception level that satisfies the BER 2.4%, outputs a radio signal, operates the turntable to rotate the antenna direction of the terminal, and adjusts the transmission level corresponding to the radiation BER of the terminal from various angles. Measure and apply to TIS formula to get TIS value.

As described in detail above, the present invention gradually reduces the transmission level so that the transmission level of the current angle is determined by using the information of the transmission level measured at the previous angle without measuring the transmission level corresponding to the received signal strength approaching the radiation BER. By adjusting and outputting a wireless signal, it is possible to reduce the time required for measuring the transmission level at an arbitrary angle and to reduce the test time at various angles, thereby measuring the radiation reception performance of the terminal faster.

Claims (4)

Calculating a difference between the transmission level value of the previous angle and the reception level value of the current angle in the measuring device; Outputting a low level wireless signal by the calculated difference; And measuring a transmission level value corresponding to a radiation error rate by decreasing a predetermined level by a level lowered by a difference. The method of claim 1, wherein the step of calculating the difference between the two levels is Storing a transmission level value corresponding to a radiation error rate of the terminal placed at a previous angle; Measuring a reception level of the terminal by outputting a radio signal of a large level to the terminal placed at a current angle; And calculating a difference between a transmission level value of the previous angle and a reception level value of the current angle. The method of claim 1, wherein the step of lowering the radio signal of the large level by the calculated difference further comprises shifting the level of the radio signal by an offset by applying an offset. . The method of claim 1, wherein the step of lowering the level by a predetermined level from the level lowered by the difference is to lower the level at intervals smaller than the predetermined level used at the initial angle.

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