CN111970727A - NB-IoT base station blocking test system - Google Patents
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- 238000003780 insertion Methods 0.000 description 6
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Abstract
The invention provides a blocking test system of an NB-IoT base station, which comprises the following steps: a first signal generator for generating a main signal of a first frequency; a second signal generator for generating an interference signal at a second frequency, the second frequency being different from the first frequency; the filtering device is connected with the second signal generator and is used for filtering the interference signal so as to suppress the noise of the interference signal at the first frequency; the signal combination device is respectively connected with the first signal generator and the filtering device and is used for receiving the main signal and the filtered interference signal, and combining and outputting the received signals; the measured NB-IoT base station is connected with the signal combination device to receive the combined signal output by the signal combination device; and the analysis device is connected with the measured NB-IoT base station and is used for acquiring the error rate of the measured NB-IoT base station under the combined signal. The scheme of the invention can reduce the noise of the interference signal in the main signal frequency band so as to improve the bit error rate test passing rate.
Description
Technical Field
The invention relates to the technical field of mobile communication testing, in particular to a blocking testing system of an NB-IoT base station.
Background
For NB-IoT (Narrow Band Internet of Things) base stations, the bit error rate limit in the Blocking (Blocking) test is one of its important indicators. According to the domestic Radio frequency technical requirements, in a blocking test of an NB-IoT base station, an interference signal is required to be an E-UTRA (Evolved UMTS Terrestrial Radio Access) broadband modulation signal of 5MHz, and the power requirement is up to +2 dBm. In the prior art, a universal signal source is used to generate such interference signals. Because the bandwidth of the interference signal is far greater than that of the useful signal, and the power of the interference signal is also far greater than that of the useful signal, the sideband noise of the interference signal is too large, the error rate cannot be solved correctly, and finally the blocking test cannot be passed. Therefore, a blocking test scheme for NB-IoT base stations that can effectively reduce the noise of the interference signal is needed.
Disclosure of Invention
In view of the above, the present invention is proposed in order to provide a congestion testing system for NB-IoT base stations that overcomes or at least partially solves the above mentioned problems.
An object of the present invention is to provide a congestion test system for NB-IoT base stations, which can reduce noise of interference signals in a main signal band to improve a bit error rate test throughput.
A further object of the present invention is to combine the main signal and the interference signal in a specific manner by means of a coupler to ensure better isolation between the main signal and the interference signal and to further improve the bit error rate test throughput.
In particular, according to an aspect of the embodiments of the present invention, there is provided a congestion test system of an NB-IoT base station, including:
a first signal generator for generating a main signal of a first frequency;
a second signal generator for generating an interference signal at a second frequency, the second frequency being different from the first frequency;
the filtering device is connected with the second signal generator and is used for filtering the interference signal so as to suppress noise of the interference signal at the first frequency;
the signal combination device is respectively connected with the first signal generator and the filtering device and is used for receiving the main signal and the filtered interference signal, combining the received signals and outputting the combined signals;
the measured NB-IoT base station is connected with the signal combination device to receive the combined signal output by the signal combination device; and
and the analysis device is connected with the measured NB-IoT base station and is used for acquiring the error rate of the measured NB-IoT base station under the combined signal.
Optionally, the filtering means comprises a band-stop filter unit.
Optionally, the band-stop filter unit includes a plurality of band-stop filters connected in series, and the stop band frequencies of the plurality of band-stop filters are the same and cover the first frequency.
Optionally, the filtering means comprises a band pass filter unit.
Optionally, the band-pass filter unit includes a plurality of band-pass filters connected in series, pass-band frequencies of the plurality of band-pass filters are the same, and pass-band frequency of each band-pass filter covers the second frequency but does not cover the first frequency.
Optionally, the filtering device includes one or more band-stop filters and one or more band-pass filters connected in series, the stop-band frequency of each band-stop filter is the same and covers the first frequency, and the pass-band frequency of each band-pass filter is the same and covers the second frequency and does not cover the first frequency.
Optionally, the signal combining device is a combiner, and two input ports of the combiner respectively receive the main signal and the filtered interference signal.
Optionally, the signal combining device is a coupler, an output port of the coupler receives the filtered interference signal, a coupling port receives the primary signal, and an input port is connected to the NB-IoT base station under test.
Optionally, the occlusion testing system further comprises an attenuator;
the first signal generator is connected with the signal combination device through the attenuator, and the attenuator is used for attenuating the main signal generated by the first signal generator.
In the congestion test system of the NB-IoT base station according to the embodiment of the present invention, a filtering device is provided to perform filtering processing on an interference signal, so as to suppress noise of the interference signal at a frequency band (i.e., a first frequency) of a main signal. By reducing the noise power of the interference signal at the frequency section of the main signal, the main signal is prevented from being submerged under the noise background of the interference signal, the error rate of the NB-IoT base station in the test can be correctly solved, and the test passing rate is improved.
Further, in the congestion testing system of the NB-IoT base station provided in the embodiment of the present invention, a coupler may be used as the signal combining device, an output port of the coupler receives the filtered interference signal, a coupling port receives the main signal, and an input port is connected to the NB-IoT base station to be tested. By the method, better isolation between the main signal and the interference signal can be ensured, and the error rate test passing rate is further improved.
The foregoing description is only an overview of the technical solutions of the present invention, and the embodiments of the present invention are described below in order to make the technical means of the present invention more clearly understood and to make the above and other objects, features, and advantages of the present invention more clearly understandable.
The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments thereof, taken in conjunction with the accompanying drawings.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 shows a schematic diagram of interference signals and useful signals in a blocking test of a prior art NB-IoT base station;
fig. 2 shows a schematic structural diagram of a congestion test system of an NB-IoT base station according to an embodiment of the present invention;
fig. 3 shows a schematic structural diagram of a congestion testing system of an NB-IoT base station according to another embodiment of the present invention;
fig. 4 shows a schematic structural diagram of a congestion testing system of an NB-IoT base station according to yet another embodiment of the present invention;
fig. 5 shows a schematic structural diagram of a congestion testing system of an NB-IoT base station according to yet another embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The sensitivity limits vary for different types of NB-IoT base stations, with minimum limits of-118.6 dBm, or even-126.6 dBm. For example, for an NB-IoT macro base station, the sensitivity limit is specified to be-126.6 dBm when the channel bandwidth is 200kHz and the subcarrier spacing is 15 kHz.
In the blocking test of the NB-IoT base station, the interference signal is required to be added on the basis of the sensitivity test so as to investigate whether the index of the bit error rate passes or not. According to the domestic radio frequency technical requirements, in the blocking test, the power of a useful signal is increased by 6dB on the basis of a sensitivity limit value, an interference signal is required to be an E-UTRA broadband modulation signal of 5MHz, and the power of the interference signal is up to +2 dBm. Thus, the power of the desired signal is one hundred twenty more dB below the power of the interfering signal. Moreover, since the interference signal is a broadband modulation signal, the bandwidth of the broadband modulation signal is twenty times of the bandwidth of the useful signal, and the interval between the useful signal and the interference signal is twenty to forty MHz, in this case, a general signal source is used to generate the interference signal, the sideband noise of the interference signal is very large, the dynamic range cannot be satisfied, and the useful signal is submerged under the noise floor (noise background) of the interference signal. Fig. 1 is a schematic diagram illustrating interference signals and useful signals in a blocking test of a NB-IoT base station in the prior art, and it can be seen from fig. 1 that the useful signals are completely submerged under the noise floor of the interference signals, and at this time, the error rate cannot be correctly solved, so that the NB-IoT base station under test cannot pass the blocking test.
To solve the above problem, an embodiment of the present invention provides a congestion test system for an NB-IoT base station. Fig. 2 shows a schematic structural diagram of a congestion testing system 10 of an NB-IoT base station according to an embodiment of the present invention. Fig. 3 shows a schematic structural diagram of a congestion testing system 10 of an NB-IoT base station according to another embodiment of the present invention. Fig. 4 shows a schematic structural diagram of a congestion testing system 10 of an NB-IoT base station according to yet another embodiment of the present invention. Fig. 5 shows a schematic structural diagram of a congestion testing system 10 of an NB-IoT base station according to yet another embodiment of the present invention.
Referring to fig. 2, the occlusion testing system 10 may include at least: a first signal generator 101, a second signal generator 102, a filtering device 300, a signal combining device 400, a measured NB-IoT base station 500, and an analyzing device 600.
The functions of the components or devices of the NB-IoT base station congestion test system 10 and the connection relationships between the components will now be described.
The first signal generator 101 is used to generate a main signal (also referred to as a useful signal) of a first frequency required for the test. The second signal generator 102 is used for generating an interference signal of a second frequency required for the test. The second frequency is different from the first frequency. For example, the first frequency may be 915MHz and the second frequency may be 877.5 MHz.
The filtering device 300 may be connected to the second signal generator 102 for performing a filtering process on the interference signal to suppress noise of the interference signal at the first frequency.
The signal combination means 400 may be connected to the first signal generator 101 and the filtering means 300, respectively, for receiving the main signal and the filtered interference signal and combining the received signals. The combined signal is output by the signal combining apparatus 400 to the NB-IoT base station 500 under test.
The NB-IoT base station 500 under test is connected to the signal combining apparatus 400 to receive the combined signal output by the signal combining apparatus 400. In particular, the combined signal may include a main signal and a filtered interference signal. The analysis device 600 is connected to the NB-IoT base station 500 to be tested, and is configured to obtain the error rate of the NB-IoT base station 500 to be tested under the combined signal. Specifically, the analysis device 600 may be a computer or an electronic device loaded with error rate analysis software, or the like.
In the congestion testing system 10 of the NB-IoT base station according to the embodiment of the present invention, the filtering device 300 is configured to perform filtering processing on the interference signal, so as to suppress noise of the interference signal at the frequency band (i.e., the first frequency) of the main signal. By reducing the noise power of the interference signal at the frequency section of the main signal, the main signal is prevented from being submerged under the noise background of the interference signal, the error rate of the NB-IoT base station in the test can be correctly solved, and the test passing rate is improved.
Referring to fig. 3, in one embodiment, the filtering apparatus 300 may include a band-stop filter unit 301 disposed between the second signal generator 102 and the signal combining apparatus 400. By appropriately selecting the filtering frequency band of the band elimination filter unit 301, it is possible to effectively filter out noise of the interference signal at the frequency band (i.e., the first frequency) of the main signal.
The band-stop filter unit 301 may be constituted by a single band-stop filter 303 or a plurality of band-stop filters 303. A band-stop filter is a filter that passes most frequency components, but attenuates certain ranges of frequency components to a very low level. By selecting the band-stop filter 303 with a stop band frequency that covers the first frequency of the main signal, the interfering signal can be effectively band-stop filtered at the main signal frequency. For example, if the first frequency of the main signal is 915MHz, the band-stop filter 303 with a stopband frequency covering 915MHz (for example, the stopband frequency is 910 MHz and 920MHz) may be selected.
In practical applications, the power of the interference signal reaching the NB-IoT base station 500 under test needs to reach +2dBm, and the power of the interference signal generated from the second signal generator 102 needs to be greater than +2dBm (for example, may reach +10dBm) in consideration of the insertion loss of the filtering apparatus 300 and the signal combining apparatus 400 during transmission. Under such big power, the sideband noise of interfering signal is very big, and then leads to being used for carrying out the pressure of the band elimination filter of filtering to interfering signal also can be very big, and single band elimination filter is difficult to guarantee to satisfy the filtering demand because the stopband suppression degree is not enough. Therefore, in a preferred embodiment, the band-stop filter unit 301 may comprise a plurality of band-stop filters 303 connected in series, the stop band frequencies of the plurality of band-stop filters 303 being the same, and the stop band frequency of each band-stop filter 303 covering the first frequency. The number of the series-connected band-stop filters 303 can be 2, 3, etc., and the invention does not limit the number of the series-connected band-stop filters to meet the filtering requirement. By adopting the mode that the plurality of band elimination filters 303 are connected in series to filter the interference signal, the power of the interference signal at the main signal frequency can be ensured to be reduced to be lower than that of the main signal, the interference of the noise background of the interference signal to the main signal is avoided, and the error rate test accuracy and the passing rate are improved.
Referring to fig. 4, in one embodiment, the filtering apparatus 300 may include a band pass filter unit 302 disposed between the second signal generator 102 and the signal combining apparatus 400. By appropriately selecting the filtering frequency band of the band-pass filter unit 302, it is possible to effectively filter out noise of the interference signal at the frequency band (i.e., the first frequency) of the main signal while ensuring that the effective frequency band of the interference signal normally passes through.
The band pass filter unit 302 may be composed of a single band pass filter 304 or a plurality of band pass filters 304. A band-pass filter is a filter that passes frequency components in a certain frequency range, but attenuates frequency components in other ranges to an extremely low level. By selecting the band-pass filter 304 having the passband frequency covering the second frequency of the interference signal but not covering the first frequency of the main signal, it is ensured that the effective frequency band (i.e. the frequency band near the second frequency) of the interference signal passes through, and simultaneously, other frequency components (including the component at the first frequency) outside the effective frequency band are attenuated, thereby achieving the effect of reducing the noise power of the interference signal at the frequency band of the main signal. For example, if the first frequency of the main signal is 915MHz and the second frequency of the interference signal is 877.5MHz, the bandpass filter 304 with a channel frequency of 870 and 880MHz, for example, may be selected.
In a preferred embodiment, the band pass filter unit 302 may include a plurality of band pass filters 304 connected in series. The passband frequencies of the plurality of bandpass filters 304 are the same, and the passband frequency of each bandpass filter 304 covers the second frequency but does not cover the first frequency. The number of the band pass filters 304 connected in series can be 2, 3, etc., and the number is not limited by the present invention to meet the filtering requirement. By adopting the mode that the plurality of band-pass filters 304 are connected in series to filter the interference signal, the power of the interference signal at the main signal frequency can be ensured to be reduced to be lower than that of the main signal, the interference of the noise background of the interference signal to the main signal is avoided, and the error rate test accuracy and the passing rate are improved.
Referring to fig. 5, in one embodiment, the filtering apparatus 300 may include one or more band-stop filters 303 and one or more band-pass filters 304 in series. The stop band frequencies of each band stop filter 303 are the same and cover the first frequency. The passband frequencies of each bandpass filter 304 are the same and cover the second frequency and not the first frequency. It should be noted that fig. 5 only schematically shows one band-stop filter 303 and one band-pass filter 304, in practical applications, an appropriate number of band-stop filters 303 and band-pass filters 304 may be used according to actual requirements, and the relative positions of the band-stop filters 303 and the band-pass filters 304 and the second signal generator 102 are not limited by those shown in fig. 5, and the interference signal generated by the second signal generator 102 may pass through the band-pass filter 304 first and then the band-stop filter 303, or may pass through the band-stop filter 303 and then the band-pass filter 304 first. The selection of the stopband frequency of the bandstop filter 303 and the passband frequency of the bandpass filter 304 are as described above and will not be described herein.
By using the band-stop filter and the band-pass filter to filter the interference signal in a combined manner, the noise of the interference signal in the frequency band of the main signal can be further reduced, and the accuracy and the passing rate of the bit error rate test are further improved.
In addition, it should be noted that, no matter a band-pass filter or a band-stop filter is adopted, the pass band of the filter must be ensured to be the second frequency of the interference signal, and the insertion loss at the second frequency needs to meet the power requirement on the interference signal in the test. Preferably, the insertion loss at the second frequency may be as small as possible to minimize the power loss of the interfering signal at the second frequency. Moreover, it is necessary to ensure that the stop band of the filter is the first frequency of the main signal, and the insertion loss at the first frequency is required to reduce the power of the interference signal at the first frequency to be lower than the power of the main signal. Preferably, the insertion loss at the second frequency is as large as possible to ensure that the main signal is not drowned in the noise of the interfering signal.
The signal combining device 400 combines the two input signals (i.e., the main signal and the filtered interference signal) into one signal, and outputs the one signal to the NB-IoT base station 500 under test. In one embodiment, the signal combining means 400 may be a combiner. Two input ports of the combiner respectively receive the main signal and the filtered interference signal. The combiner combines signals of different frequency bands together for output, simplifies the application operation of main signals and interference signals, saves feeders and simplifies the structure.
However, the isolation between the two input ports of the combiner is typically only twenty-three dB, in which case there is a risk of interference between the two input signals. In particular, in the embodiment of the present invention, since the power difference between the interference signal and the main signal is large, the interference signal inputted to the signal combiner 400 easily crosses into the channel of the signal combiner 400, so as to interfere with the main signal, which may cause the main signal to be submerged under the noise background of the interference signal. To address this problem, in another embodiment, the signal combining means 400 may also be a coupler. The output port of the coupler is connected to the filtering apparatus 300 to receive the filtered interference signal, the coupled port is connected to the first signal generator 101 to receive the main signal, and the input port is connected to the NB-IoT base station 500 to transmit the combined signal to the NB-IoT base station 500 through the input port. Through this special connection manner, on one hand, an interference signal can enter the NB-IoT base station 500 to be tested through the through port of the coupler (insertion loss is about 1 dB), so as to further reduce the power loss of the interference signal, and thus the transmission power of the second signal generator 102 (not called as an interference signal source) can be reduced, so that the dependence on the high-end output power option of the interference signal source is reduced, and higher noise can be avoided. On the other hand, the main signal is input into the coupler through the coupling port, and needs to undergo attenuation of about 20dB, and enters the NB-IoT base station 500 to be tested after being attenuated to the coupler input end, and because the isolation between the coupling port and the output port of the coupler used in this example is 50dB, about 50dB of isolation can be generated between the main signal and the interference signal, compared with the combiner, better isolation between the main signal and the interference signal is ensured, that is, interference between the interference signal and the main signal is better avoided by flexibly utilizing the characteristics of the coupler to suppress unnecessary noise, thereby further improving the bit error rate test throughput. It should be noted that, in this embodiment, the isolation between the main signal and the interference signal depends on the isolation between the coupled port and the output port of the coupler used.
In one embodiment, the occlusion testing system 10 may further include an attenuator 200. The first signal generator 101 is connected to the signal combination means 400 via an attenuator 200, i.e. the attenuator 200 is connected between the first signal generator 101 and the signal combination means 400, as can be seen in particular in fig. 2 to 5. The attenuator 200 is used to attenuate the main signal generated by the first signal generator 101. As mentioned earlier, the main signal required is of low power during the blocking test, and a large uncertainty results if such a low power signal is output directly from the first signal generator 101 (which is not referred to as the main signal source). By arranging the attenuator 200 on the output path of the first signal generator 101, the output power of the main signal source can be increased (for example, the output power of the main signal source can be set to-80 dBm or more), and the attenuator 200 attenuates the main signal output by the main signal source so that the power of the main signal is attenuated to meet the requirement of the blocking test. In this way, a main signal with stable amplitude can be obtained more easily.
According to any one or a combination of multiple optional embodiments, the embodiment of the present invention can achieve the following advantages:
in the congestion test system of the NB-IoT base station according to the embodiment of the present invention, a filtering device is provided to perform filtering processing on an interference signal, so as to suppress noise of the interference signal at a frequency band (i.e., a first frequency) of a main signal. By reducing the noise power of the interference signal at the frequency section of the main signal, the main signal is prevented from being submerged under the noise background of the interference signal, the error rate of the NB-IoT base station in the test can be correctly solved, and the test passing rate is improved.
Further, in the congestion testing system of the NB-IoT base station provided in the embodiment of the present invention, a coupler may be used as the signal combining device, an output port of the coupler receives the filtered interference signal, a coupling port receives the main signal, and an input port is connected to the NB-IoT base station to be tested. By the method, better isolation between the main signal and the interference signal can be ensured, and the error rate test passing rate is further improved.
In the description provided herein, numerous specific details are set forth. It is understood, however, that embodiments of the invention may be practiced without these specific details. In some instances, well-known methods, structures and techniques have not been shown in detail in order not to obscure an understanding of this description.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments can be modified or some or all of the technical features can be equivalently replaced within the spirit and principle of the present invention; such modifications or substitutions do not depart from the scope of the present invention.
Claims (9)
1. A system for congestion testing of NB-IoT base stations, comprising:
a first signal generator for generating a main signal of a first frequency;
a second signal generator for generating an interference signal at a second frequency, the second frequency being different from the first frequency;
the filtering device is connected with the second signal generator and is used for filtering the interference signal so as to suppress noise of the interference signal at the first frequency;
the signal combination device is respectively connected with the first signal generator and the filtering device and is used for receiving the main signal and the filtered interference signal, combining the received signals and outputting the combined signals;
the measured NB-IoT base station is connected with the signal combination device to receive the combined signal output by the signal combination device; and
and the analysis device is connected with the measured NB-IoT base station and is used for acquiring the error rate of the measured NB-IoT base station under the combined signal.
2. A jam testing system as claimed in claim 1, characterised in that the filtering means comprises a band-stop filter unit.
3. A jamming test system according to claim 2, characterized in that the band-stop filter unit comprises a plurality of band-stop filters in series, the band-stop filters having the same stop-band frequency and covering the first frequency.
4. The occlusion test system of claim 1, wherein the filtering means comprises a band pass filter unit.
5. The occlusion test system of claim 4, wherein the band-pass filter unit comprises a plurality of band-pass filters connected in series, the band-pass filters having the same pass-band frequency, the pass-band frequency of each of the band-pass filters covering the second frequency but not the first frequency.
6. The occlusion test system of claim 1, wherein the filtering means comprises one or more band-stop filters and one or more band-pass filters in series, each of the band-stop filters having a stopband frequency that is the same and covers the first frequency, each of the band-pass filters having a passband frequency that is the same and covers the second frequency and does not cover the first frequency.
7. The jam test system of claim 1, characterized in that the signal combination device is a combiner, two input ports of which receive the main signal and the filtered interference signal, respectively.
8. The congestion test system according to claim 1, wherein the signal combining apparatus is a coupler, an output port of the coupler receives the filtered interference signal, a coupled port receives the primary signal, and an input port is connected to the NB-IoT base station under test.
9. The occlusion test system of claim 1, further comprising an attenuator;
the first signal generator is connected with the signal combination device through the attenuator, and the attenuator is used for attenuating the main signal generated by the first signal generator.
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