KR100228011B1 - Test jig for mobile station performance measurement - Google Patents

Abstract

1. TECHNICAL FIELD OF THE INVENTION

The present invention relates to a test jig for measuring the performance of a mobile station.

2. The technical problem to be solved by the invention

The present invention provides a wireless channel path to measure the various performance of the mobile station by setting a simulation test environment in the mobile station located between the base station equipment or the instrument and the mobile station to measure the performance of the mobile station in the code division multiple access method of the personal communication system The purpose is to provide a test jig.

3. Summary of Solution to Invention

According to the present invention, the mobile station wireless channel path and input unit can be externally controlled through the RS232C parallel port, thereby automatically adjusting the time interval and level of the received power to set a simulation environment similar to the actual field, and the path loss of each wireless channel path. By tabulating the data and adjusting only the switch from the outside, the wireless channel path with the pre-predicted path loss offset is automatically set up to ensure uniformity of measurement for each test item. Can be done.

4. Important uses of the invention

The present invention is used to measure the performance of various mobile stations.

Description

Test jig for mobile station performance measurement

The present invention is located between a base station equipment or a measuring instrument and a mobile station for measuring mobile station performance of a code division multiple access (CDMA) personal communication system (PCS). The present invention relates to a test jig that provides a radio channel path to measure various performances of a mobile station.

In the code division multiple access personal communication system, the performance and functional evaluation techniques of the mobile station are based on the American National Standards Institute (ANSI) standard J-STD-018 (minimum performance standard of 1800 MHz code division multiple access mobile station) and CDG (CDMA). Development Group has been validated by measuring the recommendations of the Stage.

In a conventional mobile station test environment, various radio frequency (RF) devices are configured between a base station equipment and a mobile station or between an instrument and a mobile station to establish a radio channel path.

However, in the past, field simulation environment setting of some of the mobile station performance measurement items is difficult and measurement in the laboratory is impossible. In one example, the handoff test has not been arbitrarily adjusted in a form in which two channel powers received by the mobile station have a periodic level, and thus, the quantitative evaluation of the mobile station handoff performance has not been performed. In addition, the closed-loop power control experiment measures the mobile station closed-loop power control response time according to the variation of the Additive White Gaussian Noise Generator (AWGN) level received by the base station. The test was not possible because the AWGN could not be arbitrarily adjusted. In this field, the 800MHz code division multiple access type mobile station is not quantitatively measured in the field, and when the mobile station handoff operation fails, duplicate verification of the mobile station and the base station is required to identify the cause of the mobile station.

In the case of other item measurement, a time delay factor occurred because the radio channel path between the base station equipment, the instrument, and the mobile station was required to have a different shape for each test item, and the RF elements on the path had to be rearranged.

In order to solve the above problems, the present invention, by allowing the external control of the wireless channel path and input of the mobile station through the RS232C-type parallel port to automatically adjust the time interval and level of the received power to simulate the test environment similar to the actual field In addition, the path loss data of each wireless channel path can be tabled to adjust the switch externally so that the wireless channel path including the pre-predicted path loss offset can be automatically set to ensure the uniformity of the measurement for each test item. In addition, other test items have a purpose to provide a test jig that can be easily performed without a separate external operation.

1 is a block diagram of a test jig for mobile station performance measurement according to the present invention;

2 is a diagram of a neighbor set pilot detection time of a mobile station.

3 is a diagram of a mobile station transmit power in a closed loop power control test.

* Explanation of symbols for the main parts of the drawings

14: interface board 16: digital attenuator

28,30: Digital Switch

In order to achieve the above object, the present invention, in the test jig for measuring the performance of the mobile station by setting a radio channel path using a plurality of elements between the base station equipment and the mobile station or the instrument and the mobile station, the attenuation control from an external device Matching means for matching with the external device to receive a command and a switching control command; First attenuation means for adjusting a time interval of a signal received to the mobile station and attenuating a signal level in accordance with an attenuation control command input through the matching means; First switching means for switching a receiving path of the mobile station in accordance with a switching control command input through the matching means; Second attenuation means for attenuating a signal transmitted from the mobile station; And second switching means for switching the transmission path of the mobile station in accordance with a switching control command input through the matching means.

In addition, the present invention is a test jig for measuring the performance of the mobile station by setting a radio channel path between the base station equipment and the mobile station or the instrument and the mobile station, the external to receive attenuation control command and switching control command from an external device Matching means for matching with the device; Digital attenuation means for receiving an output of an external source base station or an additional white Gaussian noise generator (AWGN) through an external attenuator and re-attenuating according to an attenuation control command input through the matching means; First digital switching means for switching the output of said digital attenuation means in accordance with a switching control command input through said matching means; First combining means for combining the output of the digital switching means with a signal of another path; First signal blocking means for delivering an output of said first combining means and for blocking a reverse signal; First band pass filtering means for passing the reception band of the mobile station during the output of the first signal blocking means; Second band pass filtering means for receiving an output from the mobile station and passing a necessary band; Step attenuation means for attenuating the output of said second band pass filtering means; Second digital switching means for switching the output of said step attenuation means in accordance with a switching control command input through said matching means; Second combining means for combining the outputs of the first and second digital switching means; First distributing means for distributing the output of the second coupling means; Third digital attenuation means for attenuating one output of said first distribution means and outputting it to said source base station; And fourth digital attenuation means for attenuating the other output of the first distribution means and outputting it to an external target base station.

Hereinafter, with reference to the accompanying drawings will be described an embodiment according to the present invention;

1 is a configuration diagram of a test jig for measuring mobile station performance according to the present invention.

As shown in the figure, the present invention includes a digital attenuator module that can be adjusted as a computer at the base station equipment and the instrument input unit for adjusting the received signal power, and configures a wireless channel path capable of providing all different channel environments for each measurement item. It is connected to the interface board and has a digital switch module that automatically sets each wireless channel path with computer control commands from the outside.

Looking at the configuration and operation of the present invention in detail as follows.

For example, in Table 1 to be described later, the channel paths of the adjacent set pilot detection and the pilot misdetection test during soft handoff are forward paths. The external attenuator 11 receives and attenuates the source base station output or the AWGN output, The digital attenuator 16 re-attenuates the output of the external attenuator 11 in accordance with an external attenuation control command input through the interface board 14, and an external switching control command input through the interface board 14. Accordingly, the digital switch 30 for switching the output of the digital attenuator 16, the combiner 31 for coupling the output of the digital switch 30 and the output of the combiner 32, and the output of the combiner 31 are forwarded. Isolator 33 and a mobile station in the output of the isolator 34 for transmitting to the band pass filter 34 and for interrupting a reverse signal from the band pass filter 34. It consists of a band pass filter 34 which transmits only the reception band of the signal to be transmitted to the mobile station through an external directional coupler 13.

That is, the channel pilot strength, which is the source base station output, is automatically set by the attenuation level according to the control command of an external computer connected through the interface board 14 in the digital attenuator 16 and set to the experimental reference value of FIG. 2. The other source base station outputs are inputted directly to the combiner 32 and inputted to the combiner 31 simultaneously with the output of the source base station because the channel pilot intensity is unchanged. These signals are directionally input from the isolator 33 to the band pass filter 34, and only the signal bands of the reception bands (1810 MHz to 1820 MHz) of the mobile station are passed through the directional coupler 13 to the mobile station.

On the other hand, the output path of the mobile station is a reverse path, and the output of the band pass filter 35 and the band pass filter 35 which receives the output from the mobile station through the directional coupler 13 and passes only the necessary bands in stages. A step attenuator 29 for attenuating, a digital switch 28 for switching the output of the step attenuator 29 according to an external switching control command input through the interface board 14, and the two digital switches 28, 30. A combiner 27 coupling the outputs of the "), a divider 25 distributing the output of the combiner 27, a digital attenuator 23 attenuating one output of the divider 25 and outputting it to the source base station and the It consists of a digital attenuator 24 which attenuates the other output of the divider 25 and outputs it to an external target base station.

In the case of the closed-loop power control experiment of Table 1 described below, when the terminal transmission power of the reverse path needs to be fixed in advance, the level is manually adjusted by the step attenuator 29, and the AWGN output strength is controlled by the digital attenuator ( 16) to adjust automatically.

Next, the forward path at the time of measuring an item in which a special measuring instrument is used passes only a band pass filter 17 for passing only a necessary band among inputs from an external first measuring instrument, and a necessary band among inputs from an external second measuring instrument. And a combiner 32 which combines the outputs of the two band pass filters 17 and 20 and outputs the combined band 31 to the combiner 31. The fading emulator 12 is directly connected to the combiner 32.

On the other hand, the reverse path at the time of measuring the item used by the special measuring instrument, the divider 26 for receiving and distributing the output of the digital switch 28, and transmits one output of the divider 26 to the band pass filter 18 And an isolator 19 for blocking a signal from the band pass filter 18, a band pass filter 18 for passing only a required band among the outputs of the isolator 19 to be output to the first measuring instrument, and the divider. The second output of the isolator 22 and the output of the isolator 22 to pass the other output of the (26) to the band pass filter 21 and to block the signal from the band pass filter 21 to pass the first It consists of a band pass filter 21 which is output to two instruments.

2 shows a diagram of the neighbor set pilot detection time of a mobile station.

Here, T_ADD is the value of the base station pilot strength that the neighboring base station must satisfy to enter the candidate base station, and T_DROP is the lowest signal level value for the base station to remain in the active set.

The digital attenuator, which operates only when data is applied, receives data programmed from the computer through the RS232C parallel port as shown in FIG. Attenuator controls that support this feature are provided as level control circuitry with the program in the form of an interface board for compatibility with the attenuator.

The prior art has adjusted the transmit signal power of the base station equipment output by setting the transmit gain value of the up converter directly, but the base station output signal vs. time diagram is not precisely adjusted as required by the measurement item. Noise (PN) The ratio of the average energy per chip to the total transmit power spectral density (Ec / Io) variation was generated by the test algorithm and the handoff region could not be tested.

In order to solve this problem, the present invention configures a digital attenuator module having a microsecond switch timing on the mobile station reception path, and adjusts the attenuation so that the attenuation effect of the signal diagram equal to the requirements of the measurement item can be obtained. The program was written so that the damping effect occurred at random intervals. For example, the attenuation period T of FIG. 2 can be adjusted to any value in units of 10 msec.

When measuring an item that uses a special instrument, the instrument is applied to the mobile station receiving path and connected to an external terminal. In this case, the digital channel is controlled through an external computer so that the wireless channel path is set to external equipment. In addition, a detachable blocking cap was installed to prevent unnecessary signals from flowing through external input terminals of an unused path for each test item.

3 shows a diagram for mobile station transmit power in a closed loop power control test.

In order to provide a simulation environment in which the handoff algorithm is operated in the mobile station, two base station equipments are used. Even though the transmission gain value of the up-converter of the target base station is fixed, the attenuation level is arbitrarily changed only for the channel power received from the source base station. The pilot Ec / Io received by the mobile station can be varied. In this case, the mobile station performs neighbor set pilot detection by its handoff algorithm to report a handoff related message. The handoff test measures the handoff detection time reported by the mobile station, and the present invention enables this test. In the closed loop power control test, the AWGN is connected to the digital attenuator to input the attenuation control program data so that the transmit power of the mobile station is as shown in FIG. In this case, the transmission power of the mobile station after the attenuator operation should be changed within the range of 8 dB or more and 12 dB or less (in case of 9.6 Kbps) for every 12.5 ms according to the specification value, and the present invention can also test this measurement. In addition, a fading emulator meter is inserted on the mobile station reception path when the mobile station multipath fading item is measured. In this case, a digital switch can be automatically set as a channel path for external equipment by a computer, thereby predicting a path loss offset. The items to be solved by the present invention among the US ANSI mobile station performance measurement items that have not been tested by the prior art are shown in Table 1 below.

Table 1

Specification Name Specification Table of Contents Measurement Item Name ANSI J-STD-008 (PN-3385): 1800-MHz CDMA Mobile Station Minimum Performance Specification 3.2.33.2.43.2.53.2.63.2.73.3 Idle Handoff Adjacent Aggregate Pilot Detection in Slot Mode and Pilot Misdetection in Soft Handoff Candidate Aggregation Pilot Detection and Pilot Misdetection in Soft Handoff Active Aggregate Pilot Detection and Pilot Misdetection in Soft Handoff Idle Handoff Demodulation Requirements CDG2: CDG Phase 2 Interlock Function Test Specification 4.14.2 Closed Loop Power Control Test Forward Call Channel Power Control

The present invention described above is not limited to the above-described embodiments and the accompanying drawings, and various substitutions, modifications, and changes can be made in the art without departing from the technical spirit of the present invention. It will be apparent to those of ordinary knowledge.

The present invention as described above, by configuring a digital attenuator module that automatically adjusts the time interval and level by computer control through the RS232C parallel port in the external equipment input unit of the mobile station receiving path, the two kinds of channel power input to the mobile station is instantaneously Arbitrary adjustments provide a simulation environment in which the mobile station causes handoffs, enabling closed-loop output power testing when experimenting with external equipment applied to the inputs, and pre-table and test path loss data for each radio channel path. By operating the switch outside the jig, the path loss can be predicted for each test item by automatically setting the channel path.

In addition, by simulating experiments that could not be quantitatively evaluated in the field environment when measuring mobile station performance, it is possible to test in a short time without additional equipment even in the laboratory, thereby reducing additional cost and measuring time. In addition, by objectively evaluating a number of products in a uniform environment, revalidation due to changes in the test environment becomes unnecessary, thereby increasing work efficiency.

Claims (10)

In the test jig for measuring the performance of the mobile station by setting a radio channel path using a plurality of elements between the base station equipment and the mobile station or meter and the mobile station, Matching means for matching with the external device to receive an attenuation control command and a switching control command from an external device; First attenuation means for adjusting a time interval of a signal received to the mobile station and attenuating a signal level in accordance with an attenuation control command input through the matching means; First switching means for switching a receiving path of the mobile station in accordance with a switching control command input through the matching means; Second attenuation means for attenuating a signal transmitted from the mobile station; And Second switching means for switching a transmission path of the mobile station in accordance with a switching control command inputted through the matching means Test jig made up, including. The method of claim 1, At least one of the signals input from the at least one measuring instrument to pass through the receiving band of the mobile station to be transmitted to the mobile station through the receiving path of the mobile station to measure a predetermined test item to provide a variety of receiving paths to the mobile station First band pass filtering means; Distribution means for distributing the output of the second switching means to provide various transmission paths to the mobile station; At least one signal blocking means for receiving and transmitting the output of the distribution means and blocking the signal of the opposite echo; And At least one second band pass filter for receiving the output of the signal blocking means and passing the required band to output to the measuring instrument Test jig made up more. The method according to claim 1 or 2, And connecting an external fading emulator to the receive path of the mobile station to test the multipath fading of the mobile station. The method of claim 3, wherein The matching means, Signals to automatically adjust the time interval and level of received power to set up a simulated test environment similar to the actual field, and table the path loss data of each radio channel path to automatically generate a wireless channel path with a predicted path loss offset. The test jig, characterized in that for receiving a signal to be set from the external device. The method of claim 3, wherein The external input terminal of each path, A test jig, wherein a detachable blocking cap is installed to prevent unnecessary signals from being input through an external input terminal which is not used for testing each test item. In the test jig for measuring the performance of the mobile station by setting a radio channel path between the base station equipment and the mobile station or meter and the mobile station, Matching means for matching with the external device to receive an attenuation control command and a switching control command from an external device; Digital attenuation means for receiving an output of an external source base station or an additional white Gaussian noise generator (AWGN) through an external attenuator and re-attenuating according to an attenuation control command input through the matching means; First digital switching means for switching the output of said digital attenuation means in accordance with a switching control command input through said matching means; First combining means for combining the output of the digital switching means with a signal of another path; First signal blocking means for delivering an output of said first combining means and for blocking a reverse signal; First band pass filtering means for passing the reception band of the mobile station during the output of the first signal blocking means; Second band pass filtering means for receiving an output from the mobile station and passing a necessary band; Step attenuation means for attenuating the output of said second band pass filtering means; Second digital switching means for switching the output of said step attenuation means in accordance with a switching control command input through said matching means; Second combining means for combining the outputs of the first and second digital switching means; First distributing means for distributing the output of the second coupling means; Third digital attenuation means for attenuating one output of said first distribution means and outputting it to said source base station; And Fourth digital attenuation means for attenuating the other output of the first distribution means and outputting it to an external target base station Test jig made up, including. The method of claim 6, Third band pass filtering means for passing a required band during input from an external first meter; Fourth band pass filtering means for passing a required band during input from an external second instrument; Third combining means for combining the outputs of the third and fourth band pass filtering means and outputting the outputs to the first combining means; Second distributing means for distributing an output of the second digital switching means; Second signal blocking means for receiving and transmitting one output of the second distributing means and blocking a signal of an opposite echo; Fifth band pass filtering means for receiving the output of the second signal blocking means and passing the required band to output to the first measuring instrument; Third signal blocking means for receiving and transmitting the other output of the second distribution means and blocking the signal of the opposite echo; And Fifth band pass filtering means for receiving the output of the third signal blocking means and passing the required band to output the second signal; Test jig made up more. The method of claim 7, wherein And further coupling an external fading emulator to the third coupling means to test multipath fading of the mobile station. The method of claim 8, The matching means, Signals to automatically adjust the time interval and level of received power to set up a simulated test environment similar to the actual field, and table the path loss data of each radio channel path to automatically generate a wireless channel path with a predicted path loss offset. The test jig, characterized in that for receiving a signal to be set from the external device. The method of claim 9, The external input terminal of each path, A test jig, wherein a detachable blocking cap is installed to prevent unnecessary signals from being input through an external input terminal which is not used for testing each test item.

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