An in-building base station frequency scanning system and method

Abstract

The present invention relates to the field of cellular communication technologies, and specifically to an in-building base station sweep frequency system and method, which have the characteristics of accurate results, detailed parameters, and low cost; it includes a 5G signal detection circuit, and the 5G signal detection circuit is provided with: a 5G signal receiving module; which is used to receive the 5G signal of the in-building base station and switch the received 5G signal to different output ports for output; a 5G frequency band transmission module; which has multiple 5G transmission links led out from each output port of the 5G signal receiving module, and each 5G transmission link is provided with a filtering circuit for filtering out the remaining frequency bands so as to retain at least one 5G target frequency band, and the other ends of these 5G transmission links are connected to the input ports of the 5G demodulation module that are adapted to the 5G target frequency band; a 5G demodulation module; which controls the 5G signal receiving module to perform the switching of the output ports, demodulates the 5G target frequency band input from the input ports, and sends the 5G demodulation result to the backend device.

Description

Technical Field

[0001] The present invention relates to the field of cellular communication technology, and particularly to an in-building base station sweep frequency system and method. Background Art

[0002] The in-building distribution system, namely the indoor distribution system, is a solution for improving the mobile communication environment in buildings. Its principle is to evenly distribute the cellular signals of the operator's base stations (i.e., in-building antennas) to every corner of the indoor area through various in-building base stations, so as to ensure ideal signal coverage in the indoor area. There are rich devices inside these in-building base stations. With the increase of the usage time and the influence of the usage environment, they will gradually age, and the aging devices will affect the signal quality. In severe cases, it may even cause the complete failure of the in-building base station where they are located. In recent years, major domestic operators have received more and more signal quality complaints. Especially in large crowded places and buildings with complex structures, due to the large number of 5G and 4G in-building base stations, the frequency of faults will also increase. Therefore, it is necessary to detect the signal quality of in-building base stations in real time or regularly.

[0003] In the prior art, the detection scheme for 4G in-building base stations has been relatively mature, but there are still some problems with the detection scheme for 5G in-building base stations. For example, for a detection scheme with high precision, its system structure is often relatively complex and costly. While for a detection scheme with a simple structure, although it has a cost advantage, there are generally problems with inaccurate detection results and frequent false alarms. Moreover, the existing detection schemes usually rely on maintenance personnel to go to the site for detection and troubleshooting, with high labor costs and low efficiency. It is often difficult for maintenance personnel to locate which specific in-building base station has a fault in a short time, which virtually prolongs the time to solve the problem and results in poor user experience. Summary of the Invention

[0004] The purpose of this invention patent is to overcome the above-mentioned deficiencies of the prior art, and provide an in-building base station sweep frequency system and method. This system can be used for the signal quality detection of 5G in-building base stations and 5G / 4G hybrid in-building base stations, and has the characteristics of accurate results, detailed parameters, and low cost.

[0005] The technical solution adopted by the present invention is as follows: An in-building base station sweep frequency system includes a 5G signal detection circuit, and the 5G signal detection circuit is provided with:

[0006] A 5G signal receiving module; used for receiving the 5G signal of the in-building base station and switching the received 5G signal to different output ports for output;

[0007] 5G Band Transmission Module; It has multiple 5G transmission links led from the output ports of the 5G signal receiving module. Each 5G transmission link is provided with a filtering circuit for filtering out other frequency bands to retain at least one 5G target frequency band. The other ends of these 5G transmission links are connected to the input ports of the 5G demodulation module that are adapted to the 5G target frequency band;

[0008] 5G Demodulation Module; Controls the 5G signal receiving module to perform switching of output ports, demodulates the 5G target frequency band input from the input port, and sends the 5G demodulation result to the backend device.

[0009] Furthermore, among the multiple 5G transmission links, at least one 5G transmission link is provided with a mixing circuit. This mixing circuit is located at the backend of the filtering circuit of this 5G transmission link, mixes the original 5G target frequency band retained after passing through the filtering circuit into a new 5G target frequency band that the 5G demodulation module can demodulate, and outputs it to the input port of the 5G demodulation module that is adapted to the new 5G target frequency band.

[0010] Furthermore, a filtering circuit for filtering out frequency bands other than the new 5G target frequency band is provided at the backend of the mixing circuit.

[0011] Furthermore, each 5G transmission link is provided with an amplifier for amplifying the signal at the backend of its filtering circuit.

[0012] Furthermore, the 5G signal receiving module includes a multi-channel output RF switch and an antenna connected thereto. The output port of each channel is respectively connected to a 5G transmission link.

[0013] Furthermore, among the input ports of the 5G demodulation module, at least one input port is provided with an expansion element for expanding the number of ports. The input side of this expansion element is connected to at least two 5G transmission links through the expanded ports. The 5G demodulation module controls this expansion element to connect different 5G transmission links so as to input different 5G target frequency bands into the expanded input port.

[0014] Furthermore, it further includes a 4G signal detection circuit for receiving and demodulating the information of each frequency band of the in-building distribution base station 4G signal. This 4G signal detection circuit controls the operation of the 5G demodulation module, receives the 5G demodulation result of the 5G demodulation module, and sends the 4G and 5G demodulation results to the backend device.

[0015] Furthermore, the 4G signal detection circuit is provided with:

[0016] 4G Signal Transceiving Module; Receives the 4G signal of the in-building distribution base station and switches the received 4G signal to different output ports for output;

[0017] 4G Band Transmission Module; having multiple 4G transmission links led out from each output port of the 4G signal receiving module, and these 4G transmission links are for unidirectional transmission or / and bidirectional transmission; each 4G transmission link filters out the remaining frequency bands in the 4G signal to retain at least one 4G target frequency band, and the other ends of these 4G transmission links are connected to the input ports of the modulation and demodulation module that are adapted to the 4G target frequency band;

[0018] 4G Modulation and Demodulation Module; controls the 5G demodulation module and the 4G signal transceiver module to work, demodulates the 4G target frequency band input from its own input port, and receives the 5G demodulation result, and sends the 4G and 5G demodulation results to the 4G power amplifier module;

[0019] 4G Power Amplifier Module; receives the 4G and 5G demodulation results sent by the 4G modulation and demodulation module, amplifies the 4G and 5G demodulation results, and sends them to the backend device through the 4G signal transceiver module.

[0020] Another technical solution of the present invention is: a method for sweeping the frequency of an in-building base station, including detecting the 5G signal of the in-building base station, and proceeding according to the following steps:

[0021] Step 1, receive the 5G signal and divide it into multiple paths for output;

[0022] Step 2, after filtering each path of 5G signal, retain at least one 5G target frequency band;

[0023] Step 3, if the 5G target frequency band retained in a certain path is within the demodulable frequency band range, then demodulate the 5G target frequency band;

[0024] Step 4, if the 5G target frequency band retained in a certain path exceeds the demodulable frequency band range, then perform mixing processing on the 5G target frequency band, the new 5G target frequency band after mixing is within the demodulable frequency band range, then filter the new 5G target frequency band after mixing, and then demodulate the filtered new 5G target frequency band;

[0025] Step 5, send the demodulated 5G demodulation result.

[0026] Further, it also includes detecting the 4G signal of the in-building base station, and proceeding according to the following steps;

[0027] Step 6, receive the 4G signal and divide it into multiple paths for output;

[0028] Step 7, after filtering each path of 4G signal, filter out the redundant frequency bands and retain at least one 4G target frequency band;

[0029] Step 8, demodulate the 4G target frequency bands retained in each path;

[0030] Step 9: Transmit the demodulated 4G demodulation results and the 5G demodulation results in Step 5.

[0031] The present invention has the following beneficial effects:

[0032] 1. Through the design of multiple transmission links, the present invention can separate 5G signals into multiple frequency bands, and the 5G demodulation module can demodulate each frequency band, thereby accurately detecting the detailed information of each frequency band in the 5G signal;

[0033] 2. The 4G signal detection circuit can independently complete the demodulation of 4G signals and send the 4G demodulation results to the backend device. The 5G demodulation module in the present invention only needs to be responsible for demodulating the detailed information of each frequency band of the 5G signal, and then transmit this information to the 4G signal detection circuit, which is sent to the backend device by the 4G signal detection circuit. Since it does not directly transmit wireless signals externally, the power amplifier circuit can be omitted in the 5G signal detection circuit, greatly reducing the cost while ensuring the detection accuracy;

[0034] 3. For some high-frequency / ultra-high-frequency bands that exceed the demodulation range of the 5G demodulation module, the present invention uses a mixing circuit to adjust them to the low-frequency / intermediate-frequency range that can be demodulated, and then demodulates the signals through the 5G demodulation module to achieve low-frequency / intermediate-frequency demodulation of high-frequency and ultra-high-frequency signals;

[0035] 4. The 5G signal receiving module outputs the 5G signal to each transmission link by switching the output ports, and then expands the number of ports of the 5G demodulation module through expansion elements. There will be no signal conflicts between the expanded ports, enabling a single 5G demodulation module to demodulate multiple frequency bands and saving costs;

[0036] 5. The 5G signal detection circuit of the present invention has no power amplifier and has the characteristic of low power consumption, and can be placed at the in-building distribution base station end for real-time monitoring, greatly improving the detection efficiency and detection effect. Description of the Drawings

[0037] Figure 1 It is a schematic circuit structure diagram of Embodiment 1 of the present invention.

[0038] Figure 2 It is a schematic circuit structure diagram of Embodiment 2 of the present invention.

[0039] Reference numerals in the drawings:

[0040] The first antenna ANT1, the first RF switch A1, the 5G transmission link A2, the filter circuit A3, the low-noise amplifier LNA, the mixing circuit A4, the expansion element A5, the 5G demodulation module U1;

[0041] The second antenna ANT2, the second radio frequency switch C1, the 4G transmission link C2, the duplexer C3, the power amplifier PA, and the 4G modulation and demodulation module U2. Detailed implementation manners

[0042] To enable those of ordinary skill in the art to more clearly understand the purpose, technical solutions, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. However, the present invention is not limited to the following embodiments.

[0043] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "inner", "outer", "front end", "backend", "both ends", "one end", "the other end", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0044] Embodiment 1

[0045] As Figure 1 shown, this embodiment provides an in-building base station sweep frequency system, including a 5G signal detection circuit, which is provided with a 5G signal receiving module, a 5G frequency band transmission module, and a 5G demodulation module U1.

[0046] The 5G signal receiving module includes a first radio frequency switch A1 (one input and multiple outputs) with multi-channel outputs and the first antenna ANT1 connected thereto. The first antenna ANT1 is used to receive the 5G signal of the in-building base station. The first radio frequency switch A1 connects the first antenna ANT1 to different output ports under the control of the 5G demodulation module U1, so as to output the received 5G signal from different output ports. Figure 1 The first radio frequency switch A1 shown in

[0047] The 5G band transmission module has multiple 5G transmission links A2 led out from each output port of the 5G signal receiving module. Each 5G transmission link A2 is provided with a filtering circuit A3 for filtering out the remaining bands in the 5G signal so as to retain at least one 5G target band (such as BPF+LPF, that is, band-pass filter + low-pass filter. Obviously, other filters can also be selected). The number of 5G target bands transmitted by each 5G transmission link A2 is determined according to the demodulation ability of the 5G demodulation module U1. Usually, each 5G transmission link transmits a single 5G target band. A low-noise amplifier LNA for amplifying the signal is provided at the backend of each filtering circuit A3. The other ends of these 5G transmission links are connected to the input ports (i.e., low-frequency in low-frequency port, medium-frequency in medium-frequency port, high-frequency in high-frequency port) of the 5G demodulation module that are adapted to the 5G target bands.

[0048] The number of 5G transmission links A2 is determined according to the number of bands of the 5G signal. The 5G target bands retained by each 5G transmission link are different from each other. Generally, only one 5G transmission link accesses the 5G signal at a time. The 5G target bands transmitted by all transmission links should cover all bands of the 5G signal when added up. Figure 1 As shown, there are 8 5G transmission links, which are respectively used to transmit different 5G target bands, such as: N79, N78 (or N77), N41, N1, N3, N8, N5, N28 bands.

[0049] The 5G demodulation module U1 mainly has two functions. One is to control the 5G signal receiving module to perform output port switching, so that the 5G signal received by the first antenna ANT1 enters different transmission links, and different 5G target bands are obtained after filtering. The other is to demodulate the 5G target bands of each transmission link input from its own input port, and send the 5G demodulation results of the 5G target bands to the backend device. Through the 5G demodulation module, the cell information of signals in these bands such as N79, N78 (or N77), N41, N1, N3, N8, N5, N28 can be demodulated to realize the detection of 5G NR signals in the full band. The 5G demodulation results obtained by the 5G demodulation module include PLMN (Public Land Mobile Network), EARFCN (Channel Number), CELL_ID (Base Station ID), PCI (Physical Cell Coding), RSRP (Reference Signal Received Power), RSRQ (Reference Signal Quality). After the backend device obtains the 5G demodulation results, it can judge the 5G signal quality of the in-building distribution base station according to this information, so as to judge whether there is a fault, and can accurately locate the in-building distribution base station where the fault occurs.

[0050] Obviously, the 5G demodulation module can select an existing 5G chip with modulation and demodulation functions. In this embodiment, since the 5G demodulation module only needs to use its demodulation function, an existing 5G demodulation chip with only 5G signal demodulation function can also be selected, which can appropriately reduce the cost while meeting the functional requirements.

[0051] If a certain frequency band of the 5G signal exceeds the frequency band demodulation range of the 5G demodulation module, such as the high-frequency N79 frequency band, a frequency mixing circuit A4 can be set on the 5G transmission link of this frequency band. The frequency mixing circuit A4 has a mixer and is located at the rear end of the filtering circuit A3 on this 5G transmission link. The original 5G target frequency band retained after passing through the filtering circuit A3 is mixed into a new 5G target frequency band that the 5G demodulation module can demodulate (for example, the high-frequency N79 frequency band is mixed and adjusted to the low-frequency N8 frequency band), and is output to the input port (i.e., the input port of the N8 frequency band) on the 5G demodulation module that is adapted to the new 5G target frequency band, and then demodulated by the 5G demodulation module.

[0052] Adjusting the high frequency to the low frequency makes use of the characteristic that frequency mixing only adjusts the frequency and does not change the information of the modulation signal. The frequency band information demodulated by the 5G demodulation module from the new 5G target frequency band (the mixed N8 frequency band) is still the information of the original 5G target frequency band (i.e., the N79 frequency band), which can accurately reflect the signal situation of this frequency band of the in-building base station.

[0053] Under normal circumstances, the number of input ports of the 5G demodulation module is limited. For example, Figure 1 the shown 5G demodulation module has only 4 input ports, but the signals of 8 5G transmission links all need to be input to the 5G demodulation module. In this embodiment, the input ports of the 5G demodulation module are expanded, mainly by setting expansion elements A5 for expanding the number of ports at two low-frequency input ports and one intermediate-frequency input port. The expansion element A5 at each low-frequency input port expands one port into 2 ports, and the two low-frequency input ports are expanded into 4 ports in total. Among them, 3 ports are respectively connected to the 5G transmission links of the N8, N5, and N28 frequency bands, and the other port is connected to the 5G transmission link of the N79 frequency band. The expansion element A5 at the intermediate-frequency input port expands one port into 3 to 4 ports, which are respectively connected to the 5G transmission links of the N41, N1, and N3 frequency bands. The high-frequency input port of the 5G demodulation module is connected to the 5G transmission link of the N77 / N78 frequency band.

[0054] Obviously, the expansion element A5 can be selected as a radio frequency switch, or other existing IO chips with channel selection functions can be used for replacement.

[0055] The working principle of this embodiment is as follows: The 5G demodulation module can control different output ports by switching the first radio frequency switch A1, so as to control the 5G signals received by the first antenna ANT1 to be input to different 5G transmission links. Then, the signals outside the 5G target frequency band are filtered out by the filter circuit A3, and the signals in the 5G target frequency band are further amplified by the low-noise amplifier LNA. Then, through the switching of the expansion element A5, the 5G target frequency band is sent to the corresponding input port of the 5G demodulation module for demodulation. The obtained 5G demodulation result can be sent to the backend device by using existing cellular data networks such as 4G communication or other wireless or wired methods. During this process, the frequency bands beyond the demodulation ability of the 5G demodulation module will be adjusted to the demodulable frequency band range through mixing and then demodulated. By the above method, after scanning and demodulating all the frequency bands of the 5G signal one by one, the 5G signal situation of the complete in-building base station is obtained.

[0056] Embodiment 2

[0057] On the basis of Embodiment 1, this embodiment adds a 4G signal detection circuit to demodulate the 4G signals of the in-building base station. At the same time, the 4G signal detection circuit controls the 5G demodulation module of the 5G signal detection circuit to work, and communicates with the 5G demodulation module, receives the 5G demodulation result of Embodiment 1, and sends the 4G demodulation result and the 5G demodulation result to the backend device. The 4G signal detection circuit can adopt an existing 4G signal detection circuit.

[0058] Embodiment 3

[0059] As Figure 2 shown, on the basis of Embodiment 2, in this embodiment, the 4G signal detection circuit is provided with:

[0060] The 4G signal transceiver module can receive the 4G signals of the in-building base station and switch the received 4G signals to different output ports for output. Its structure is similar to that of the 5G signal receiving module in Embodiment 1, and the above work is completed through the second radio frequency switch C1 and the second antenna ANT2. The difference is that the 4G signal transceiver module can also transmit signals outward;

[0061] The 4G band transmission module has multiple 4G transmission links C2 led out from each output port of the 4G signal receiving module. Each 4G transmission link C2 transmits at least one 4G target band and is connected to the input port of the 4G modulation and demodulation module that is adapted to the 4G target band. These 4G transmission links C2 are unidirectional, or bidirectional, or a combination of unidirectional and bidirectional transmission, which can be determined according to actual needs. Each 4G transmission link filters out the 4G target band through the filter circuit A3. Among them, the bidirectional 4G transmission link can use a duplexer C3 to receive and transmit signals and filter out the 4G target band in one step, and then decide whether to set a filter circuit for secondary filtering according to the signal situation of the 4G target band. Generally, the 4G target bands transmitted by all transmission links should cover all bands of the 4G signal in total.

[0062] The 4G modulation and demodulation module U2 uses an existing 4G chip with modulation and demodulation capabilities, which can control the 5G demodulation module and the 4G signal transceiver module to work, demodulate the 4G target band input from its own input port, and receive the demodulation result of the 5G demodulation module (the communication between the 5G demodulation module U1 and the 4G modulation and demodulation module U2 is digital signal communication and has a certain anti-interference ability), and send the 4G and 5G demodulation results to the 4G power amplifier module.

[0063] The 4G power amplifier module has a power amplifier PA, which can receive the 4G and 5G demodulation results sent by the 4G modulation and demodulation module. After amplifying the 4G and 5G demodulation results (it can be decided whether to set a filter circuit according to the amplified signal situation), it is directly transmitted or transmitted to the 4G signal transceiver module through the 4G transmission link, and then sent to the backend device through the 4G signal transceiver module.

[0064] In this embodiment, the 4G modulation and demodulation module receives signals through the 4G signal transceiver module and the 4G transmission link, and transmits signals through the power amplifier PA, the 4G transmission link, and the 4G signal transceiver module, which can all refer to the prior art and will not be introduced in detail here.

[0065] Embodiment 4

[0066] This embodiment provides a method for sweeping the frequency of an in-building base station. This method uses the above-mentioned in-building base station frequency sweeping system to detect the 5G signal of the in-building base station and is carried out according to the following steps:

[0067] Step 1, the 5G demodulation module controls the first RF switch A1 of the 5G signal receiving module to switch to the corresponding output port, connect the corresponding 5G transmission link A2. In this way, after the 5G signal is received by the first antenna ANT1 of the 5G signal receiving module, the 5G signal can be distributed to multiple 5G transmission links for output through port switching; generally, only one 5G transmission link accesses the 5G signal each time.

[0068] Step 2, the 5G signal of each 5G transmission link is filtered by the filter circuit A3 to filter out the redundant frequency bands, retain at least one 5G target frequency band, and perform signal amplification processing on the 5G target frequency band; the 5G target frequency bands retained by each 5G transmission link are different from each other, and the 5G target frequency bands transmitted by all transmission links should cover all frequency bands of the 5G signal.

[0069] Step 3, if the 5G target frequency band retained by a certain 5G transmission link is within the demodulable frequency band range of the 5G demodulation module, the 5G demodulation module demodulates the 5G target frequency band.

[0070] Step 4, if the 5G target frequency band retained by a certain 5G transmission link exceeds the demodulable frequency band range of the 5G demodulation module, the 5G target frequency band is subjected to frequency mixing processing through the frequency mixing circuit A4. The new 5G target frequency band after frequency mixing is within the demodulable frequency band range of the 5G demodulation module. Then, the new 5G target frequency band is filtered by the subsequent filter circuit A3, and after the signal amplification processing of the new 5G target frequency band again, the 5G demodulation module demodulates the filtered and amplified new 5G target frequency band.

[0071] Step 5, send the demodulated 5G demodulation result to the backend device.

[0072] Embodiment 5

[0073] On the basis of Embodiment 4, this embodiment also detects the 4G signal of the in-building base station, receives and sends the 5G demodulation result of Embodiment 4, and proceeds as follows;

[0074] Step 6, the 4G modulation and demodulation module controls the 4G signal transceiver module to switch to the corresponding output port, connect the corresponding 4G transmission link. In this way, after the 4G signal received by the 4G signal receiving module, the 4G signal can be distributed to multiple 4G transmission links for output through port switching; generally, only one 4G transmission link accesses the 4G signal each time.

[0075] Step 7, the 4G signal of each 4G transmission link is filtered to filter out the redundant frequency bands, retain at least one 4G target frequency band, and the 4G target frequency bands retained by each 4G transmission link are different from each other. The 4G target frequency bands transmitted by all transmission links should cover all frequency bands of the 4G signal.

[0076] Step 8: The 4G modulation and demodulation module demodulates the reserved 4G target frequency bands of each 4G transmission link to obtain 4G demodulation results;

[0077] Step 10: Control the 5G demodulation module to work and receive the 5G demodulation results transmitted by the 5G demodulation module. After amplifying the 4G and 5G demodulation results, send them to the backend device through the 4G transmission link and the 4G signal transceiver module. After obtaining the 4G and 5G demodulation results, the backend device can judge the 4G and 5G signal quality of the in-building base station according to the information contained in the demodulation results, thereby judging whether there is a fault and accurately locating the in-building base station with the fault.

[0078] The above are only the preferred embodiments of the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A frequency scanning system for an indoor base station, characterized in that: It includes a 5G signal detection circuit, which has: 5G signal receiving module; used to receive 5G signals from indoor base stations and switch the received 5G signals to different output ports for output; 5G frequency band transmission module; having multiple 5G transmission links led out from each output port of the 5G signal receiving module, each 5G transmission link is provided with a filter circuit for filtering out the remaining frequency bands so as to retain at least one 5G target frequency band, and the other ends of these 5G transmission links are connected to the input port of the 5G demodulation module that is compatible with the 5G target frequency band; 5G demodulation module; controls the 5G signal receiving module to switch the output port, demodulates the 5G target frequency band input from the input port, and sends the 5G demodulation result to the back-end device; Among the multiple 5G transmission links, at least one 5G transmission link is provided with a mixing circuit, which is located at the rear end of the filtering circuit of this 5G transmission link. The mixing circuit mixes the original 5G target frequency band retained after passing through the filtering circuit into a new 5G target frequency band that can be demodulated by the 5G demodulation module, and outputs it to the input port on the 5G demodulation module that is compatible with the new 5G target frequency band.

2. The indoor base station frequency scanning system according to claim 1, characterized in that: The back end of the mixing circuit is provided with a filtering circuit for filtering out frequency bands other than the new 5G target frequency band.

3. A frequency scanning system for indoor base stations as claimed in claim 1 or 2, characterized in that: Each 5G transmission link is equipped with an amplifier for amplifying the signal at the back end of its filtering circuit.

4. A frequency scanning system for indoor base stations as claimed in claim 1 or 2, characterized in that: The 5G signal receiving module includes a multi-channel output RF switch and an antenna connected thereto, and the output port of each channel is respectively connected to a 5G transmission link.

5. A frequency scanning system for indoor base stations as claimed in claim 1 or 2, characterized in that: Among the input ports of the 5G demodulation module, at least one input port is provided with an extension element for expanding the number of ports, and the input side of the extension element is connected to at least two 5G transmission links through the extended port. The 5G demodulation module controls the extension element to connect different 5G transmission links so as to input different 5G target frequency bands into the extended input port.

6. A frequency scanning system for indoor base stations as claimed in claim 1 or 2, characterized in that: It also includes a 4G signal detection circuit for receiving and demodulating the information of each frequency band of the 4G signal of the indoor base station. The 4G signal detection circuit controls the operation of the 5G demodulation module, receives the 5G demodulation result of the 5G demodulation module, and sends the 4G and 5G demodulation results to the back-end device.

7. The indoor base station frequency scanning system according to claim 6, characterized in that: The 4G signal detection circuit has: 4G signal transceiver module; receives 4G signals from the indoor base station and switches the received 4G signals to different output ports for output; 4G frequency band transmission module; There are multiple 4G transmission links led out from each output port of the 4G signal receiving module, and these 4G transmission links are unidirectional transmission or / and bidirectional transmission; each 4G transmission link filters out the remaining frequency bands in the 4G signal so as to retain at least one 4G target frequency band, and the other ends of these 4G transmission links are connected to the input ports of the modulation and demodulation module that are compatible with the 4G target frequency band; 4G modulation and demodulation module; controls the operation of the 5G demodulation module and the 4G signal transceiver module, demodulates the 4G target frequency band input from its own input port, receives the 5G demodulation result, and sends the 4G and 5G demodulation results to the 4G power amplifier module; 4G power amplifier module; receives the 4G and 5G demodulation results sent by the 4G modulation and demodulation module, amplifies the 4G and 5G demodulation results, and sends them to the back-end device through the 4G signal transceiver module.

8. A frequency scanning method for an indoor base station, characterized in that: The method comprises using the indoor base station frequency scanning system as claimed in claim 1 or 2 to detect the 5G signal of the indoor base station according to the following steps: Step 1, receiving 5G signals and dividing them into multiple outputs; Step 2: After filtering, each 5G signal retains at least one 5G target frequency band; Step 3: If a reserved 5G target frequency band of a certain channel is within the demodulatable frequency band range, the 5G target frequency band is demodulated; Step 4: If a reserved 5G target frequency band of a certain channel exceeds the demodulated frequency band range, the 5G target frequency band is mixed, and the new 5G target frequency band after mixing is within the demodulated frequency band range. Then, the new 5G target frequency band is filtered, and then the filtered new 5G target frequency band is demodulated; Step 5: Send the demodulated 5G demodulation result.

9. The indoor base station frequency scanning method according to claim 8, characterized in that: It also includes detecting the 4G signal of the indoor base station, and performing the following steps; Step 6, receiving 4G signals and dividing them into multiple outputs; Step 7: After filtering, each 4G signal removes redundant frequency bands and retains at least one 4G target frequency band; Step 8, demodulate the reserved 4G target frequency bands of each channel; Step 9: Send the demodulated 4G demodulation result and the 5G demodulation result in step 5.

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