Combination system

Abstract

The invention discloses a combining system. The system comprises a first wireless information source device, a second wireless information source device, a first combiner, a second combiner and a plurality of branch combiners, and the first wireless information source device is connected with the first combiner; the second wireless information source equipment is connected with the second combiner; the first combiner is connected with the plurality of branch combiners through a first main feeder line, the second combiner is connected with the plurality of branch combiners through a second main feeder line, and one or more branch combiners in the plurality of branch combiners are respectively connected with the branch feeder lines, and the plurality of branch combiners are positioned at intersection nodes of the first main feeder line, the second main feeder line and the branch feeder lines. According to the method and the device, the technical problem of relatively large uplink interference caused by the fact that wireless signals are distributed to branch feeder lines of different building flat floors through the same main feeder line in related technologies is solved.

Description

Technical Field

[0001] This application relates to the field of wireless communication, and more specifically, to a combining system. Background Technology

[0002] When providing network coverage for indoor wireless mobile communication signals (e.g., 4G and 5G wireless communication) in large buildings such as business offices and hotels, due to factors such as the building's exterior wall structure (mostly reinforced concrete or highly permeable exterior glass) and interior partitions (walls, desks, chairs, etc.), or from the perspective of increasing the capacity of the building's indoor wireless communication network, it is necessary to build a wireless indoor communication distribution system (hereinafter referred to as: wireless indoor distribution) within the building.

[0003] Wireless indoor distribution systems are mainly divided into active and passive systems. Passive systems are widely deployed in existing networks due to their relatively low deployment cost and ease of evolution and upgrade. When multiple wireless communication signals of different frequency bands are carried within the same passive system, various factors such as construction techniques, component materials and performance, and the frequency band of the third-order intermodulation component can cause uplink interference to certain wireless communication devices. This reduces the wireless data throughput rate of the corresponding wireless communication devices and lowers the user's wireless service experience. Frequency Division Duplex (FDD) wireless communication systems, due to the continuous reception of wireless signals on the uplink channel, are significantly more severely affected by interference than Time Division Duplex (TDD) wireless communication systems.

[0004] When multiple frequency bands of wireless signals are carried on the same passive antenna feeder, due to the nonlinear characteristics of passive devices, the wireless signals between the corresponding frequency bands will generate third-order, fifth-order, and other intermodulation components.

[0005] When the radio frequency of the intermodulation component is within the uplink band of the corresponding wireless communication device, and the signal strength reaching the device is relatively high compared to the receiving sensitivity, it will negatively impact the key performance characteristics of the wireless communication device, such as its wireless throughput rate. Among these, the third-order intermodulation component has a significantly higher strength than other intermodulation components, such as the fifth-order component, thus primarily having a greater impact on the wireless communication system.

[0006] For FDD communication systems, machine thermal noise, channel white noise, and other factors contribute to uplink channel interference noise (hereinafter referred to as: noise floor). A high noise floor severely impacts the demodulation efficiency of air interface data and significantly increases the air interface bit error rate. Furthermore, according to wireless communication protocols, FDD wireless communication devices, based on the principle of wireless channel reciprocity, assume that both uplink and downlink air interface interference levels are high when the noise floor is high. Consequently, they simultaneously reduce the MCS modulation order of both uplink and downlink wireless signals to improve air interface stability, but at the expense of wireless throughput performance.

[0007] When the intermodulation component of the wireless indoor distribution system is relatively high, it mixes with machine thermal noise, channel white noise, etc., which significantly increases the noise floor of the communication equipment, thereby reducing the wireless throughput rate of the wireless equipment and causing the service rate of the wireless terminal to decrease significantly.

[0008] For example, when the wireless communication equipment of operator A's main indoor wireless distribution bands FDDLTE1800, FDDNR2100, and TDDNR3500 and operator B's main indoor wireless distribution bands TDDLTE2300 and TDDNR2600 are deployed on the same passive antenna feeder, according to the third-order intermodulation component generation mechanism, the uplink channels of operator A's FDDLTE1800 and FDDNR2100 will receive third-order intermodulation component interference. That is, the third-order intermodulation components of operator B's TDDNR2600 and operator A's TDDNR3500 fall on operator A's FDDNR2100 uplink band, and the third-order intermodulation components of operator B's TDDLTE2300, operator B's TDDNR2600, and operator A's FDDNR2100 fall on operator A's FDDLTE1800 uplink band.

[0009] To circumvent the above problems, the wireless communication industry often adopts the following method: using a combiner with low intermodulation performance (such as a high-performance POI), multiple wireless RRUs are combined and then distributed to different building level branch antennas through the same trunk antenna feeder.

[0010] However, the above method has the following problems: on the one hand, POI is expensive and not suitable for mass promotion, and due to the large insertion loss of POI (about 3dB), the coverage of the wireless signal source is severely reduced; on the other hand, multiple RRU radio frequency signals are combined at maximum power with almost no attenuation. Although a low intermodulation index combiner is used, the absolute value of the power of the generated third-order intermodulation signal is still strong. When the third-order intermodulation signal is transmitted back to the corresponding frequency band RRU on the wireless uplink, it can still cause obvious uplink interference to this RRU.

[0011] There is currently no effective solution to the above problems. Summary of the Invention

[0012] This application provides a combining system to at least solve the technical problem of significant uplink interference caused by related technologies distributing wireless signals to branch feeders on different building floors through the same backbone feeder.

[0013] According to one aspect of this application, a combining system is provided, comprising: a first wireless source device, a second wireless source device, a first combiner, a second combiner, and a plurality of branch combiners, wherein the first wireless source device is connected to the first combiner, wherein the first wireless source device is used to generate wireless radio frequency signals, the first combiner is used to receive and aggregate the wireless radio frequency signals from the first wireless source device, and transmit the aggregated wireless radio frequency signals to a branch feeder, the branch feeder being used to perform power distribution and path extension on the received wireless radio frequency signals; the second wireless source device and the first combiner are ... combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used to generate wireless radio frequency signals, the first combiner is used The system is configured with two combiners, wherein a second wireless source device is used to generate a wireless radio frequency signal, and a second combiner is used to receive and aggregate the wireless radio frequency signal from the second wireless source device and send the aggregated wireless radio frequency signal to a branch feeder; a first combiner is connected to multiple branch combiners through a first trunk feeder, and a second combiner is connected to multiple branch combiners through a second trunk feeder; one or more of the multiple branch combiners are respectively connected to a branch feeder, wherein the multiple branch combiners are located at the intersection of the first trunk feeder, the second trunk feeder and the branch feeder.

[0014] Optionally, the first wireless source device includes multiple wireless source devices in different wireless frequency bands managed by the first telecommunications operator; the second wireless source device includes multiple wireless source devices in different wireless frequency bands managed by the second telecommunications operator, wherein the first telecommunications operator and the second telecommunications operator are different telecommunications operators.

[0015] Optionally, the first wireless source device includes: multiple frequency division duplex wireless source devices managed by different communication operators; the second wireless source device includes: multiple time division duplex wireless source devices managed by different communication operators.

[0016] According to one aspect of this application, another combining system is also provided, comprising: a first wireless source device, a second wireless source device, a first combiner, and a plurality of branch combiners, wherein the first wireless source device is connected to the plurality of branch combiners via a first trunk feeder, wherein the first wireless source device is used to generate a wireless radio frequency signal and transmit the wireless radio frequency signal to the branch feeder, and the branch feeder is used to perform power distribution and path extension on the received wireless radio frequency signal; the second wireless source device is connected to the first combiner, wherein the second wireless source device is used to generate a wireless radio frequency signal, and the first combiner is used to receive and aggregate the wireless radio frequency signal from the second wireless source device and transmit the aggregated wireless radio frequency signal to the branch feeder; the first combiner is connected to the plurality of branch combiners via a second trunk feeder, and one or more of the plurality of branch combiners are respectively connected to the branch feeder, wherein the plurality of branch combiners are located at the intersection node of the first trunk feeder, the second trunk feeder, and the branch feeder.

[0017] Optionally, the first wireless source device includes: a multi-frequency, multi-mode, frequency division duplex wireless source device.

[0018] Optionally, the combining system further includes an uplink conditioner, wherein the uplink conditioner is connected to a first coupler in the first wireless source device and the first backbone feeder, respectively, wherein the uplink conditioner is used to receive and separate uplink radio frequency signals of different frequency bands from the first wireless source device, and to selectively attenuate uplink radio frequency signals of specific frequency bands.

[0019] Optionally, the uplink regulator is located at the radio frequency channel port of the first wireless source device; or, the uplink regulator is located between the first wireless source device and the junction node.

[0020] Optionally, the uplink regulator includes a multi-band filter combining submodule and a radio frequency attenuation submodule, wherein the multi-band filter combining submodule is used to receive and separate uplink radio frequency signals from different frequency bands from the first radio source device, and the radio frequency attenuation submodule is used to attenuate the signal strength of uplink radio frequency signals in a specific frequency band by adjusting a preset attenuation value.

[0021] Optionally, the wireless RF attenuation submodule is connected in series with the connectors between the input and output ports of the upper and lower cavities of the multi-band filter combining submodule via a standard RF interface.

[0022] Optionally, the wireless RF attenuation submodule includes one or more RF signal channels, each RF signal channel is used to transmit uplink wireless RF signals in a specific frequency band, wherein a fixed attenuation resistor is connected in series in each RF signal channel, the fixed attenuation resistor is used to provide a preset base attenuation.

[0023] Optionally, the wireless radio frequency attenuation submodule is also provided with multiple operable components on its exterior. Each operable component corresponds to a double-pole double-throw switch inside the wireless radio frequency attenuation submodule. When any operable component is pressed, the double-pole double-throw switch corresponding to that operable component closes, connecting the corresponding variable attenuation resistor to the radio frequency signal channel, so as to attenuate the signal strength of the uplink wireless radio frequency signal of a specific frequency band through a specific attenuation value.

[0024] In this application, a first wireless signal source device, a second wireless signal source device, a first combiner, a second combiner, and multiple branch combiners are employed. The first wireless signal source device is connected to the first combiner. The first wireless signal source device generates a wireless radio frequency (RF) signal. The first combiner receives and aggregates the RF signals from the first wireless signal source device and transmits the aggregated RF signal to a branch feeder. The branch feeder performs power distribution and path extension on the received RF signals. The second wireless signal source device is connected to the second combiner. The second wireless signal source device generates a RF signal. The second combiner receives and aggregates the RF signals from the second wireless signal source device and transmits the aggregated RF signal to a branch feeder. The branch feeder performs power distribution and path extension on the received RF signals. The signal is sent to branch feeders; the first combiner is connected to multiple branch combiners through the first main feeder, and the second combiner is connected to multiple branch combiners through the second main feeder. One or more of the multiple branch combiners are connected to branch feeders respectively. The multiple branch combiners are located at the intersection of the first main feeder, the second main feeder and the branch feeders. By increasing the multi-level combined path structure and rationally arranging the main feeders, the initial strength value of the third-order intermodulation component is significantly reduced, thereby achieving the technical effect of improving wireless communication quality and data throughput. This solves the technical problem of large uplink interference caused by related technologies distributing wireless signals to branch feeders on different building floors through the same main feeder. Attached Figure Description

[0025] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0026] Figure 1 This is a structural diagram of a combining system according to an embodiment of this application;

[0027] Figure 2 This is a structural diagram of another combining system according to an embodiment of this application;

[0028] Figure 3 This is a structural diagram of another combining system according to an embodiment of this application;

[0029] Figure 4 This is a structural diagram of another combining system according to an embodiment of this application;

[0030] Figure 5 This is a structural diagram of another combining system according to an embodiment of this application;

[0031] Figure 6 This is a structural diagram of another combining system according to an embodiment of this application;

[0032] Figure 7 This is a schematic diagram of the appearance of an uplink regulator according to an embodiment of this application;

[0033] Figure 8 This is a schematic diagram of a filter submodule according to an embodiment of this application;

[0034] Figure 9 This is a schematic diagram of the attenuation submodule according to an embodiment of this application;

[0035] Figure 10 This is a schematic diagram of an uplink attenuation value adjustment setting method according to an embodiment of this application. Detailed Implementation

[0036] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0037] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0038] To better understand the embodiments of this application, the technical terms involved in the embodiments of this application are explained below:

[0039] 1. Wireless duplex system: This refers to the technical method of achieving bidirectional signal transmission within the same communication system. In civilian wireless communication systems, frequency division duplex (FDM) and time division duplex (TDM) are mainly used. FDM achieves uplink (mobile to base station) and downlink (base station to mobile) signal transmission by dividing the frequency band into two fixed frequency bands. TDM achieves bidirectional communication within the same frequency band by time division, supporting flexible frame structure adjustment.

[0040] 2. Wireless Indoor Distribution System: This system is designed to improve signal coverage in buildings by distributing base station signals evenly throughout the indoor area using distributed antennas, addressing issues such as weak signal strength, insufficient capacity, and frequency interference. Its infrastructure includes an antenna feeder system (containing antennas, components, and feeders) and supporting facilities (including communication equipment rooms and power supplies), comprising three main parts: signal source, transmission devices, and antennas. Typical application scenarios for this system include signal blind spots or high-traffic areas such as office buildings, shopping malls, and airports, using ceiling-mounted or panel antennas to achieve low-power, multi-point coverage.

[0041] 3. Passive Antenna Feeders: Antenna feeder systems in wireless indoor distribution systems can be further subdivided into backbone antenna feeders and floor-level branch antenna feeders. The backbone antenna feeder system is deployed within the building's low-voltage shafts, connecting upwards to the signal source and downwards to the floor-level branch antenna feeders. It transmits the wireless radio frequency signal output from the signal source to each floor-level branch antenna feeder according to the designed ratio. Floor-level branch antenna feeders are deployed in the ceiling area of ​​each floor of the building, propagating the wireless signal transmitted from the backbone feeder relatively evenly to the target coverage area of ​​the current floor. In passive antenna feeder systems, the number of backbone antenna feeders deployed is relatively small, resulting in relatively low cost; the number of floor-level branch antenna feeders deployed is larger, resulting in relatively higher overall deployment costs.

[0042] 4. Combiner: Generally used at the transmitting end, its function is to combine two or more radio frequency signals from different transmitters into one signal and send it to the radio frequency device for antenna transmission. In wireless mobile phone communication systems, its main function is to combine input signals from multiple frequency bands and output them to the same indoor distribution system. In engineering applications, the use of combiners allows a wireless indoor distribution system to operate on multiple wireless frequency bands simultaneously.

[0043] 5. Shared antenna feeder wireless indoor distribution: This refers to the construction of a passive antenna feeder that connects different wireless communication signal sources from multiple operators to this antenna feeder through a combiner, so as to achieve common wireless signal coverage in the area where the passive antenna feeder is deployed.

[0044] 6. Third-order intermodulation: Third-order intermodulation is a parasitic signal phenomenon generated when two frequency signals pass through a system containing nonlinear characteristics, resulting from the mixing of the second harmonic with the fundamental frequency. This phenomenon mainly generates signals at frequencies of 2... and 2 Interference components can significantly reduce the adjacent channel selectivity and receiver sensitivity of a communication system.

[0045] Figure 1 This is a flowchart of a combining system according to an embodiment of this application, such as... Figure 1 As shown, the system includes: a first wireless source device 11, a second wireless source device 12, a first combiner 13, a second combiner 14, and multiple branch combiners 15.

[0046] The first wireless signal source device 11 is connected to the first combiner 13. The first wireless signal source device 11 is used to generate wireless radio frequency signals. The first combiner 13 is used to receive and aggregate the wireless radio frequency signals from the first wireless signal source device 11 and send the aggregated wireless radio frequency signals to the branch feeder. The branch feeder is used to perform power distribution and path extension on the received wireless radio frequency signals.

[0047] The second wireless signal source device 12 is connected to the second combiner 14. The second wireless signal source device 12 is used to generate wireless radio frequency signals, and the second combiner 14 is used to receive and aggregate the wireless radio frequency signals from the second wireless signal source device 12, and send the aggregated wireless radio frequency signals to the branch feeder.

[0048] The first combiner 13 is connected to multiple branch combiners 15 via the first main feeder, and the second combiner 14 is connected to multiple branch combiners 15 via the second main feeder. One or more of the multiple branch combiners 15 are connected to branch feeders respectively. The multiple branch combiners 15 are located at the intersection of the first main feeder, the second main feeder and the branch feeders.

[0049] It should be noted that in this embodiment, multiple branch combiners 15 are positioned at the intersection of the first main feeder, the second main feeder, and the branch feeder (building level-floor antenna branch). The effect of this design is as follows:

[0050] When the radio frequency signal output by the wireless source device reaches the combiner (multiple branch combiners 15) of the branch feeder through the trunk feeder, the propagation loss of the feeder and the insertion loss of the trunk coupler must be overcome. Compared with the industry method of directly designing the combining point at the radio frequency channel exit of the wireless source device, this embodiment makes the radio frequency power of the downlink radio frequency signal of the wireless source device significantly reduced when it reaches the combining point. This can reduce the power value of the third-order intermodulation signal generated at the combining point. Furthermore, when the third-order intermodulation signal is transmitted back to the corresponding frequency band wireless source device on the wireless uplink, it generates radio frequency power loss again, which further reduces the power value of the third-order intermodulation signal entering the radio frequency channel of the wireless source device on the uplink wireless channel.

[0051] It is worth explaining that the first wireless source device 11 refers to a wireless communication device operating in the FDD band, such as a Radio Remote Unit (RRU) in FDD-LTE or FDD-NR, or a wireless communication device operating in the TDD band, such as an RRU in TDD-LTE or TDD-NR. The first wireless source device 11 is responsible for generating radio frequency signals in the FDD or TDD band, serving as one of the signal sources in the combining system.

[0052] The first combiner 13 is a multi-band combining and splitting unit, primarily used to receive and aggregate radio frequency signals from the first wireless source device 11. Through combining, signals from different frequency bands can be transmitted on the same feeder, rather than independently. The first combiner 13 then transmits the aggregated radio frequency signals to branch feeders within the building via the first main feeder.

[0053] The backbone feeder is a long-distance, high-power-capacity feeder that connects wireless signal source equipment and branch feeders in a wireless indoor distribution system. Its main function is to transmit strong signals from the wireless source to all floors or areas of the building, serving as the primary signal transmission channel. Backbone feeders are typically deployed within the building's low-voltage electrical shafts or along the main structure to ensure signal transmission to all floors or areas requiring coverage.

[0054] Branch feeders are used for power distribution and path extension of wireless radio frequency signals within a building, distributing signals from the first combiner 13 and the second combiner 14 to various floors or rooms to achieve comprehensive wireless signal coverage.

[0055] Branch feeders branch off from the main feeder to further distribute the signal to specific coverage areas within a building. In other words, branch feeders are responsible for transmitting the signal from the main feeder to each antenna location, achieving the final distance coverage of the wireless signal within the indoor space. Branch feeders can be deployed in the ceiling area of ​​a floor or concealed within the walls, spreading the wireless signal evenly to the target coverage area in an aesthetically pleasing and discreet manner. The branch feeder connects to a series of antennas and power dividers, ensuring the signal reaches every corner, thus providing comprehensive indoor wireless coverage.

[0056] The second wireless source device 12 refers to a wireless communication device operating in the FDD band, such as a wireless remote unit (RRU) of FDD-LTE or FDD-NR, or a wireless communication device operating in the TDD band, such as a RRU of TDD-LTE or TDD-NR. The first wireless source device 11 is responsible for generating wireless radio frequency signals in the FDD or TDD band as one of the signal sources of the combining system.

[0057] When the first wireless source device 11 is a wireless communication device operating in the FDD band, the second wireless source device 12 may be a wireless communication device operating in the TDD band; when the first wireless source device 11 is a wireless communication device operating in the TDD band, the second wireless source device 12 may be a wireless communication device operating in the FDD band.

[0058] The second combiner 14 is a multi-band combining and splitting unit, primarily used to receive and aggregate radio frequency signals from the second wireless source device 12. Through combining, signals from different frequency bands can be transmitted on the same feeder, rather than independently. The second combiner 14 then transmits the aggregated radio frequency signals to branch feeders within the building via the second main feeder.

[0059] Multiple branch combiners 15 are located at the junction of the first main feeder, the second main feeder, and the branch feeders, and their function is to further combine and split signals. Specifically, one or more branch combiners 15 recombine signals from the first combiner 13 and the second combiner 14, and then distribute them to different floors or areas of the building via the branch feeders. This design allows for finer signal allocation across different floors or areas to accommodate different wireless communication needs.

[0060] It should be noted that this application employs a two-stage combining architecture. The first-stage combining occurs near the wireless source equipment. The first wireless source equipment 11 (e.g., operating in the FDD band) and the second wireless source equipment 12 (e.g., operating in the TDD band) are each connected to their corresponding combiners. The first combiner 13 and the second combiner 14 transmit signals via the first backbone feeder and the second backbone feeder, respectively. The second-stage combining occurs near the target coverage area, i.e., within different floors of a building or within a specific space. Multiple branch combiners 15 act as second-stage combiners, receiving signals from the first backbone feeder and the second backbone feeder, and combining these signals again for further distribution to specific coverage areas via branch feeders.

[0061] The junction point refers to the location where the first main feeder, the second main feeder, and the branch feeder converge. This can be a public area inside the building, such as a corridor, next to an elevator shaft, or inside a suspended ceiling. It is also a key point where the signal transitions from the "main line" to the "branch line".

[0062] Understandably, by performing a secondary combiner at the junction of the first wireless source device 11 and the second wireless source device 12, far from the intersection point, the natural attenuation during feeder propagation can be utilized to reduce signal strength, thereby reducing third-order intermodulation interference caused by excessively strong signals. This is because during signal transmission, any passive component (such as a feeder or coupler) will cause signal attenuation, and this attenuation can, to some extent, reduce the nonlinear effects generated during subsequent combining.

[0063] Located at the junction point, the branch combiner can more precisely control signal distribution, ensuring that each floor or area receives a signal of appropriate strength. This not only improves signal coverage quality but also makes the signal more balanced during transmission, reducing the risk of localized overload.

[0064] The two-stage combining layout proposed in this application reduces the need for high-performance, low-intermodulation combiners because the signal has already attenuated before reaching the second-stage combining point, thus reducing the requirements for the combiner's nonlinear performance. Furthermore, in scenarios where multiple wireless sources from different communication operators are connected to the same passive antenna distribution system, compared to traditional methods, the two-stage combining layout proposed in this application can reduce branch feeders by 50%, as well as the series of antennas and power dividers connected to those branch feeders, thereby reducing overall deployment costs. In some optional embodiments of this application, the first wireless source device 11 includes multiple wireless source devices in different wireless frequency bands managed by the first communication operator; the second wireless source device 12 includes multiple wireless source devices in different wireless frequency bands managed by the second communication operator, wherein the first and second communication operators are different communication operators.

[0065] The first wireless source device 11 refers to multiple wireless source devices operating in different frequency bands, managed and operated by the first telecommunications operator. The first telecommunications operator can be any company providing wireless communication services. The operator has direct control and management responsibility over all its wireless source devices, including signal generation, transmission parameter configuration, and device maintenance and updates. The first wireless source device 11 covers different frequency bands, such as the 1800MHz band for FDD-LTE and the 2100MHz band for FDD-NR.

[0066] The second wireless source device 12 is similar to the first wireless source device 11, but belongs to a second telecommunications operator and manages multiple wireless source devices on different wireless frequency bands. This second telecommunications operator can also be any independent wireless service provider. The second wireless source device 12 can cover a different frequency band than the first wireless source device 11, such as the 2300MHz band for TDDLTE or the 2600MHz band for TDDNR. This design ensures that even within the same indoor distribution system, different operators can maintain relatively independent frequency band operation, reducing spectrum interference.

[0067] The first wireless source device 11 and the second wireless source device 12, which coexist in the wireless indoor distribution system, belong to different communication operators, but jointly serve the wireless communication needs within the building. They are interconnected through various levels of combiners and feeder systems to form a unified signal transmission network.

[0068] Figure 2 This is a structural diagram of another combining system according to an embodiment of this application, such as... Figure 2 As shown, the first wireless source equipment includes FDD RRU1 and TDD RRU1 (belonging to the first telecommunications operator), and the first combiner is combiner 1. The second wireless source equipment includes FDD RRU2, TDD RRU2, and TDD RRU3 (belonging to the second telecommunications operator), and the second combiner is combiner 2.

[0069] exist Figure 2 In the combined system shown, different communication operators' own RRUs of different wireless frequency bands first perform the first-level combined. At the same time, each communication operator independently deploys a backbone antenna feeder. The independent backbone transmits the wireless signals after the first-level combined by each communication operator to each floor of the building distribution system. Then, the wireless signals after the first-level combined with those of other operators are combined in the second level on each floor (or the second-level combined can be performed every few floors).

[0070] In some other optional embodiments of this application, the first wireless source device includes: multiple frequency division duplex wireless source devices managed by different communication operators; the second wireless source device includes: multiple time division duplex wireless source devices managed by different communication operators.

[0071] The first type of wireless signal source equipment refers to a collection of multiple wireless signal source devices using the frequency division duplex (FDD) standard, managed by different telecommunications operators. These devices are primarily used to generate and transmit radio frequency signals in the FDD band, supporting various wireless communication services such as voice, data, and multimedia applications. FDD is a duplex communication technology where the uplink (mobile device sending signals to the base station) and downlink (base station sending signals to the mobile device) use completely separate frequency resources. This means that at any given time, mobile devices and base stations can simultaneously transmit and receive on different frequency bands.

[0072] In an indoor distribution system, the first wireless source equipment may include multiple FDD devices operating in different frequency bands, such as FDD-LTE 1800MHz band equipment and FDD-NR 2100MHz band equipment from telecommunications operator A. These devices combine signals through a first-stage combiner and then transmit them into the building via the backbone feeder to provide stable indoor wireless coverage.

[0073] The second wireless source device is similar to the first, but it is a collection of multiple time-division duplex (TDD) wireless source devices managed by different telecommunications operators. These devices focus on generating wireless signals in the TDD band, also used to support a wide range of wireless communication services. TDD is a duplex communication technology where uplink and downlink communication alternate within the same frequency band, with the signal transmission direction determined by time. This technology is particularly suitable for applications where uplink and downlink traffic are asymmetrical, as it allows for flexible adjustment of the uplink and downlink time ratios.

[0074] In an indoor distribution system, the second wireless source device may include multiple TDD devices operating in different frequency bands, such as the TDDLTE 2300MHz band device and the TDDNR 2600MHz band device from telecom operator B. Through a second-stage combiner, the signals from these TDD devices are combined with the signals from the FDD device at the building level, and finally, the signal is distributed indoors via branch feeders.

[0075] Figure 3 This is a structural diagram of another combining system according to an embodiment of this application, such as... Figure 3 As shown, the first wireless source equipment includes FDD RRU1 and FDD RRU2 (belonging to different communication operators), and the first combiner is combiner 1. The second wireless source equipment includes TDD RRU1, TDD RRU2, and TDD RRU3 (belonging to different communication operators), and the second combiner is combiner 2.

[0076] exist Figure 3In the combined system shown, all RRUs of the same duplex standard from all operators first undergo first-level combined (for example, multiple TDD RRUs are combined, and multiple FDD RRUs are combined). At the same time, independent backbone antenna feeders are deployed for TDD and FDD RRUs respectively. Different backbone antenna feeders combine the two duplex radio frequency signals after the first-level combined in the building's indoor distribution system into a second-level combined (or the second-level combined can be performed every few floors).

[0077] Figure 4 This is a structural diagram of another combining system according to an embodiment of this application, such as... Figure 4 As shown, the system includes: a first wireless source device 41, a second wireless source device 42, a first combiner 43, and multiple branch combiners 44.

[0078] The first wireless source device 41 is connected to multiple branch combiners 44 via a first main feeder. The first wireless source device 41 generates a wireless radio frequency signal and sends the wireless radio frequency signal to the branch feeder. The branch feeder is used to perform power distribution and path extension on the received wireless radio frequency signal. The second wireless source device 42 is connected to the first combiner 43. The second wireless source device 42 generates a wireless radio frequency signal. The first combiner 43 receives and aggregates the wireless radio frequency signal from the second wireless source device 42 and sends the aggregated wireless radio frequency signal to the branch feeder. The first combiner 43 is connected to multiple branch combiners 44 via a second main feeder. One or more of the multiple branch combiners 44 are respectively connected to the branch feeder. The multiple branch combiners 44 are located at the intersection of the first main feeder, the second main feeder, and the branch feeder.

[0079] It is worth explaining that the first wireless source device 41 includes: a multi-frequency, multi-mode, frequency division duplex wireless source device.

[0080] Figure 5 This is a structural diagram of another combining system according to an embodiment of this application. Figure 5 In the combined circuit system shown, Figure 4 The first wireless signal source device shown is a multi-frequency, multi-mode, frequency division duplex wireless signal source device (FDD1+FDD2 dual-mode RRU1), which can output FDD-LTE 1800MHz and FDD-NR 2100MHz wireless radio frequency signals simultaneously.

[0081] Figure 4 and Figure 5 The first wireless source device 41 in the combined system shown is essentially a first-stage combined device before wireless signals of the same duplex mode in different frequency bands are output from the RRU radio frequency channel.

[0082] When combining multi-band wireless signals, according to the principle of third-order intermodulation component generation, the more wireless signals fed into the combining point, the more third-order intermodulation components are generated; the higher the instantaneous strength of the wireless signal when it is fed into the combining point, the higher the strength of the third-order intermodulation component signal generated at the combining point.

[0083] When multiple wireless frequency band RRUs are combined into a network, a two-level combining method is adopted. The first level of combining is performed on multiple corresponding RRUs that theoretically will not fall within the uplink frequency band of the networked RRUs, and then the second level of combining is performed with the RRUs of other frequency bands.

[0084] The physical location of the second-level combining point should be as far away from the wireless source equipment (RRU) as possible. For example, the second-level combining point can be designed on each floor. This can reduce the strength of the initial third-order intermodulation component at the second-level combining point (since the combining point is far away from the RRUs, the strength of the RRU wireless signals reaching the second-level combining point has already been reduced). Secondly, it can reduce the signal strength of the third-order intermodulation component generated at the second-level combining point when it is transmitted back to the RRU (when the third-order intermodulation wireless signal is transmitted back from the second-level combining point to the RRU, a series of passive power distribution devices, feeders and feeder connectors on the backbone antenna attenuate the strength of the third-order intermodulation component signal).

[0085] Figure 6 This is a structural diagram of another combining system according to an embodiment of this application. Figure 6 It is known that the combining system also includes an uplink regulator, wherein the uplink regulator is connected to the first coupler in the first wireless source device and the first trunk feeder, respectively, wherein the uplink regulator is used to receive and separate uplink radio frequency signals from different frequency bands from the first wireless source device, and to selectively attenuate uplink radio frequency signals in a specific frequency band.

[0086] The uplink regulator is located at the radio frequency channel port of the first wireless source device; or, the uplink regulator is located between the first wireless source device and the junction node.

[0087] The uplink regulator includes a multi-band filter combining submodule and a radio frequency attenuation submodule. The multi-band filter combining submodule is used to receive and separate uplink radio frequency signals from different frequency bands from the first wireless source device. The radio frequency attenuation submodule is used to attenuate the signal strength of uplink radio frequency signals in a specific frequency band by adjusting a preset attenuation value.

[0088] The wireless radio frequency attenuation submodule is connected in series with the connectors between the input and output ports of the upper and lower cavities of the multi-band filter combiner submodule via standard radio frequency interfaces.

[0089] The wireless radio frequency attenuation submodule includes one or more radio frequency signal channels. Each radio frequency signal channel is used to transmit uplink wireless radio frequency signals in a specific frequency band. A fixed attenuation resistor is connected in series in each radio frequency signal channel to provide a preset base attenuation.

[0090] The wireless radio frequency attenuation submodule is also equipped with multiple operable components on its exterior. Each operable component corresponds to a double-pole double-throw switch inside the wireless radio frequency attenuation submodule. When any operable component is pressed, the double-pole double-throw switch corresponding to that operable component closes, connecting the corresponding variable attenuation resistor to the radio frequency signal channel, so as to attenuate the signal strength of the uplink wireless radio frequency signal of a specific frequency band through a specific attenuation value.

[0091] It is worth noting that the uplink regulator is a passive device with unidirectional adjustable RF power attenuation (attenuating RF power only for the uplink while leaving downlink power unaffected). The uplink regulator can further assist in reducing the level of third-order intermodulation interference on the uplink of FDD-based wireless signal source equipment. The uplink regulator only attenuates the uplink RF power of the FDD-based RRU in a specified frequency band, with almost no impact on the downlink wireless signal power, thus not affecting its downlink coverage. Based on the uplink interference signal strength monitored by the wireless network management system, the attenuation value of the uplink regulator is adjusted as needed to further reduce the power value of the third-order intermodulation signal reaching the FDD-based RRU on the uplink, thereby improving the interference level of the third-order intermodulation signal on the RRU. Simultaneously, based on on-site testing and analysis by technicians to determine whether the uplink transmit power of the mobile terminal is frequently at maximum output, the attenuation value is corrected to avoid attenuation values ​​causing abnormal uplink communication, thus simultaneously achieving both attenuation of the third-order intermodulation signal strength on the uplink and maintaining normal communication on the uplink.

[0092] See the external diagram of the uplink regulator. Figure 7 The schematic diagram of the filter module can be found here. Figure 8 The principle structure diagram of the attenuation submodule can be found in [link to diagram]. Figure 9 .

[0093] It should be noted that the uplink regulator is equivalent to a wireless signal attenuator in the uplink band. Although notch filters exist in the wireless communication industry and seem to achieve a similar function, and are often used to attenuate the wireless signal strength of a specified frequency or narrowband signal, notch filters have the following shortcomings when applied to the on-demand reduction of uplink wireless signal strength in the FDD RRU described in this application:

[0094] 1. The attenuation value is too large. Notch filters are mainly used to significantly attenuate unwanted signal components. The attenuation value is often between 20 and 50 dB. If used in the scenario of this application, it will seriously affect the normal uplink wireless service performance indicators.

[0095] 2. The attenuation bandwidth is too small. Notch filters are mainly used to attenuate the strength of wireless signals at a specified frequency or a specified narrow bandwidth. However, the uplink bandwidth of FDD civilian wireless communication systems is often 5~40MHz, which current notch filters cannot meet.

[0096] 3. Insufficient flatness of the attenuation curve within the specified frequency band. The notch filter attenuates the wireless signal strength with a U-shaped attenuation curve within the specified wireless bandwidth. When applied to the uplink bandwidth of FDD-based civilian wireless communication systems, the insufficient flatness of the attenuation curve will result in inconsistent uplink attenuation values ​​for wireless signals at different frequency points within the uplink bandwidth.

[0097] The uplink regulator proposed in this embodiment, apart from 1dB of insertion loss, does not have any additional attenuation of downlink frequency band signals and basically does not affect the downlink frequency band coverage capability of FDD source wireless signals. For the uplink frequency band, apart from 1dB of insertion loss, the uplink regulator can adjust the attenuation of uplink frequency band wireless broadband signals as needed according to the actual needs of the site.

[0098] Furthermore, the filtering submodule can achieve filtering and separation of downlink and uplink signals from multiple FDD RF signals. For example, it can simultaneously separate the wireless propagation paths of FDD-LTE 1800MHz and FDD-NR 2100MHz wireless RF signals in the downlink band, designing the two frequency band wireless signals to propagate in two different cavities of the same device, i.e., separating the LTE 1800MHz downlink frequency band wireless signal in... Figure 8 The lower cavity of the device shown propagates and transmits the NR2100MHz downlink wireless signal. Figure 8 The upper cavity of the device shown propagates the signal. Similarly, the uplink radio signals of FDD-LTE 1800MHz and FDD-NR 2100MHz also propagate in the lower and upper cavities, respectively.

[0099] FDD wireless signals pass through the downlink band with low loss (approximately 1dB loss), while uplink signals pass through without loss or after attenuation as needed.

[0100] With attachment Figure 8 For example, in the upper cavity of the submodule, downlink signals (2110-2160MHz) of the 5G intermediate frequency FDD-NR 2100MHz from multiple communication operators pass through with low loss, propagating from input port A to output port B; at the same time, this downlink signal is completely blocked in the lower cavity of the submodule and cannot pass through. Only the wireless signal of the FDD-LTE 1800MHz downlink frequency band (1810-1890MHz) can pass through the "input → output" route in the lower cavity.

[0101] Still attached Figure 8 For example, uplink signals (1920-1970MHz) from the intermediate frequency NR2.1G of multiple telecommunications operators propagate from output port B to input port A, passing through two SMA connectors in the upper cavity of the submodule. A wireless radio frequency attenuation submodule (hereinafter referred to as the attenuation submodule) is connected in series between these two SMA connectors. The attenuation submodule attenuates the uplink signal strength according to its set values. Similarly, FDD-LTE 1800MHz uplink signals (1710-1790MHz) propagate from output port B to input port A, passing through the attenuation submodule between the two SMA connectors in the lower cavity of the submodule.

[0102] The attenuation submodule is connected in series between two SMA connectors in each of the upper and lower half-cavities, between the input port A and output port B of the multi-band filter combiner submodule. It allows for setting the attenuation value for the uplink wireless signal as needed. Using the attenuation value button combination displayed on the cavity shell, the attenuation of the third-order intermodulation component signal strength in the uplink band of the FDD system can be achieved as required. The number of attenuation value buttons and the corresponding attenuation value for each button can be designed as needed. For example, four buttons can be designed with attenuation values ​​of 1dB, 2dB, 3dB, and 4dB respectively, allowing for a stepped attenuation setting from 1dB to 10dB. This further reduces the strength of the third-order intermodulation component signal entering the uplink demodulator of the FDD RRU, minimizing its impact on uplink demodulation performance.

[0103] Appendix Figure 9 This section demonstrates the internal structure of the attenuation submodule and the principle behind on-demand uplink wireless signal strength attenuation. The attenuation value button is essentially a double-pole double-throw switch. Taking the sub-cavity below button 1 (J1) as an example, when the button is not pressed, the RF signal propagates from left to right in this sub-cavity as 2→1→4→5. In this case, there is no attenuation from 1 to 4. When button 1 is pressed, the RF signal propagates from left to right as 2→3→6→5. Because a 1dB fixed wireless broadband resistor is preset between 3 and 6 (the flatness of this resistor's attenuation value includes the uplink wireless channel bandwidth, thus achieving flatness and consistency in the uplink attenuation value), the wireless RF signal is additionally attenuated by 1dB after passing through 3→6. Therefore, pressing button 1 results in an additional 1dB attenuation of the wireless signal. Similarly, the sub-cavities below buttons 2 and 3 can implement attenuation values ​​that can be set as needed. Any combination of the three buttons can achieve wireless signal strength attenuation for all specified values ​​within the attenuation value set.

[0104] Optionally, the uplink regulator can be installed as needed at the corresponding location of the independent backbone antenna feeder of the FDD system, such as at the RF channel port of the FDD RRU, or before the level-level combining point where the independent backbone antenna feeder of the FDD system and the TDD antenna feeder perform the second-level combining.

[0105] The following details the principle by which the combining system proposed in this application can reduce the noise floor of 4G / 5GFDD source equipment.

[0106] 1. The merging method reduces the initial value of the third-order intermodulation component at the merging point.

[0107] When deploying a passive indoor distributed antenna system (DAS) with multiple operators sharing a common antenna feeder in a building (e.g., base station equipment from multiple telecom operators' 4G and 5G wireless communication systems are simultaneously fed into the same passive antenna feeder system via source combining), if a traditional common antenna feeder scheme is used, a single-level combining scheme is employed. That is, TDD RRU1, TDD RRU2, TDD RRU3, FDDRRU1, and FDD RRU2 are combined through combiner 1, and combiner 1 is connected to the branch feeder via a coupler.

[0108] At this point, the radio signal power intensity of each wireless source device before entering the combiner is almost completely attenuated. Assume the output power of each RF channel port of the TDD RRU1, TDD RRU2, TDD RRU3, FDD RRU1, and FDD RRU2 wireless source devices is respectively... , , , , The feed-in power at the junction point is respectively , , , , The generated third-order intermodulation components, falling within the uplink frequency bands of FDD RRU1 and FDD RRU2, have the following levels: , The third-order intermodulation component levels received at FDD RRU1 and FDD RRU2 sources are respectively , After the passive antenna feeder system is deployed, the third-order intermodulation factor (IM3) is essentially fixed at each node of the system. Assuming consistent passive component performance and construction techniques, industry-recognized experimental data shows that for every 1dB increase in input signal power, the power of the third-order intermodulation component increases by 3dB. This doubling relationship results in stronger RF power of each wireless signal entering the combining point, higher initial values ​​of the third-order intermodulation component power, and stronger interference with the uplink demodulation stability of the communication system. Conversely, for every 1dB decrease in input signal power, the power of the third-order intermodulation component decreases by 3dB.

[0109] Therefore, for the primary combining scheme in the relevant technology, at the combining point, the power fed into the combiner by TDD RRU1 and TDD RRU2 and the output power of the RRU RF channel port are respectively:

[0110] ≈

[0111] ≈

[0112] At this time, the power of the third-order intermodulation component signal generated by TDD RRU1 and TDD RRU2 is 一级 .

[0113] Since the combining point of the first-level combining scheme is near each RRU, the power of the third-order intermodulation signal received by the FDD RRU in the uplink band is... ≈ 一级 .

[0114] According to the combining system proposed in this application, for example, refer to Figure 2 In the example given (excluding TDD RRU3 and FDDRRU2), the input power of TDD RRU1 and TDD RRU2 is significantly reduced at the second-stage combining point. Assuming that the signal sources of TDD RRU1 and TDD RRU2 are both installed on the 5th floor, the insertion loss of the first-stage 5dB coupler connected to the RRU is 2.3dB, and the coupling distribution of the 5dB coupler on the 6th floor level of the main feeder (main feeder antenna) is 5dB, then the input power of TDD RRU1 and TDD RRU2 at the 6th-floor combining point are as follows:

[0115] = -2.3dB -5dB -

[0116] = -2.3dB -5dB -

[0117] At this point, the power of the third-order intermodulation component signal generated by TDD RRU1 and TDD RRU2 at the second-stage combiner point is: 二级 .

[0118] Assumption and Neglecting the fact that the total power fed into TDD RRU1 and TDD RRU2 at the second-stage combiner point is reduced by 14.6 dB, the initial power intensity of the third-order intermodulation component generated at the second-stage combiner point is reduced by 17.6 dB.

[0119] 2. The two-stage combining method reduces the return signal strength of the third-order intermodulation component.

[0120] When the third-order intermodulation component at the second-level combining point is transmitted back to FDD RRU1 along the FDD RRU1 trunk antenna feeder system, it again passes through the losses of the first-level 5dB coupler connected to the RRU, the 5dB coupler on the 6th floor, and the feeder (including the feeder connector), that is:

[0121] = -2.3dB -5dB -

[0122] Assumption Neglecting the difference, compared to a single-stage combining scheme, the reduction in power of the third-order intermodulation component signal received at the FDD RRU1 source is as follows:

[0123] - =17.6dB + 2.3dB + 5dB = 24.9dB

[0124] 3. An uplink regulator is used to further reduce the uplink noise floor of the FDD source.

[0125] The purpose of the uplink regulator is to achieve on-demand attenuation adjustment of the uplink radio signal while allowing the downlink radio signal of the FDD source to pass through with minimal loss.

[0126] When the FDD-NR2100MHz source periodically exhibits high uplink noise floor, the uplink regulator is installed at the RF port of the FDD source, and the attenuation value is set using a combination of buttons. For example, by simultaneously pressing the 3dB and 4dB buttons, a 7dB attenuation value is set, causing the FDD uplink wireless signal to be attenuated by an additional 7dB before reaching the FDD source RF port and the uplink demodulator. Therefore, the third-order intermodulation interference intensity of the FDD uplink band will be further reduced by 7dB, thus contributing to a further improvement in the uplink demodulation performance of the FDD source.

[0127] It should be noted that when the uplink regulator attenuates the intensity of third-order intermodulation interference signals in the wireless uplink channel, the uplink signal strength of the mobile phone will also be attenuated accordingly. When the mobile phone transmits uplink service data signals at a certain intensity, after various attenuations, if the signal strength reaching the uplink demodulator of the base station equipment still meets the minimum receiving sensitivity requirement, it can be demodulated normally; otherwise, the base station will instruct the mobile phone to gradually increase the uplink service data signal strength until it meets the minimum receiving sensitivity of the base station's uplink demodulator, or until the uplink service data signal strength reaches the maximum transmit power of the mobile phone's uplink service data signal.

[0128] When the proportion of times a mobile phone operates at its maximum uplink data signal transmission power is high, it indicates that the wireless attenuation value of the wireless uplink channel is too large. Therefore, while introducing an uplink regulator to further reduce the intensity of third-order intermodulation interference signals, to ensure the normal communication function of the wireless uplink channel, the proportion of data sampling points where the mobile phone's uplink data signal transmission power (PUSCH Txpower) is at its maximum transmission power can be statistically analyzed. When the proportion is too high, the uplink attenuation value setting of the uplink regulator should be appropriately reduced, thereby achieving a comprehensive balance between FDD source uplink noise suppression and mobile phone uplink service perception.

[0129] For example, when the uplink noise floor of the FDD source RRU is too high (in daily wireless maintenance, when an RRU is busy with its own service and the real-time RSSI at the radio frequency channel level is ≥-90dBm for a long time, it needs to be optimized and rectified to improve the quality of wireless uplink service signals by reducing RSSI), after the on-site wireless maintenance personnel have ruled out factors such as source faults and passive antenna feeder system faults, they connect an uplink conditioner between the RRU radio frequency channel and the passive antenna feeder system backbone.

[0130] Secondly, set a medium uplink attenuation value for the uplink regulator. The back-end wireless network administrator tracks the real-time RSSI of the RF channel for about 5 minutes. When the average RSSI value is still ≥-90dBm, the on-site maintenance personnel continue to increase the uplink attenuation value of the uplink regulator until the average RSSI value is <-90dBm, or the uplink attenuation value has reached its maximum.

[0131] Then, on-site maintenance personnel used test phones to conduct uplink tests on the on-site wireless signals. One indoor distributed antenna system was selected at a level, near the end of the antenna feeder branch at the level. Uplink CQT testing was performed, with the recommended test type being uplink small packet testing, lasting approximately one minute. After the CQT test, the test log was analyzed in real-time, and the percentage of sampling points where PUSCH Txpower exceeded the rated maximum value was statistically analyzed (although the rated maximum PUSCH Txpower varies between different phones, the rated maximum PUSCH Txpower for mainstream 4G phones is 100mw (i.e., 20dBm), and for 5G phones it is 200mw (i.e., 23dBm).

[0132] When the proportion of sampling points exceeding the rated maximum value of PUSCH Txpower is too high (e.g., above 50%), the field maintenance personnel should appropriately reduce the uplink attenuation value of the uplink regulator until the proportion of sampling points exceeding the rated maximum value of PUSCH Txpower is reduced to the preset value.

[0133] Figure 10 This is a schematic diagram of an uplink attenuation value adjustment method according to an embodiment of this application, as shown below. Figure 10 As shown, the method includes the following steps:

[0134] Step S1: Based on the relationship between the frequency bands of the third-order intermodulation signals generated by the RRU wireless signals of different frequency bands and the uplink frequency bands of these RRUs, plan and design the RRU at the first-level combining point so that the third-order intermodulation component signals generated at the first-level combining point are outside the uplink frequency bands of these RRUs.

[0135] Step S2: Plan and design the specifications and models of the combiners used at the second-level combining points, so that these combiners use interfaces with low intermodulation values, and reasonably reduce the intermodulation signal strength generated by the combining signal when the input signal strength is fixed.

[0136] Step S3: Based on the installation space of the field equipment, the propagation loss characteristics of wireless signals in different frequency bands, and wireless capacity planning, the combining point after the first-level combining of different frequency band RRUs is moved as far away as possible, so as to minimize the downlink RF power before entering the second-level combining point.

[0137] Step S4: Plan and implement a separate antenna feeder backbone for each first-level merging point.

[0138] In step S5, different antenna feeder backbones at the building level are combined in the second stage using a combiner of appropriate specifications and models to feed multiple wireless signals of different frequency bands into the building level antenna feeder.

[0139] Step S6: When the uplink noise floor of the FDD source RRU is too high (for example, when the RRU is busy for a long time, the real-time RSSI at the radio frequency channel level is ≥-90dBm), after the on-site wireless maintenance personnel have ruled out factors such as source failure and passive antenna feeder system failure, they connect an uplink regulator between the RRU radio frequency channel and the passive antenna feeder system backbone.

[0140] Step S7: Set a medium uplink attenuation value for the uplink regulator. The background wireless network administrator tracks the real-time RSSI of the RF channel for about 5 minutes. When the average RSSI value is still too high, the on-site maintenance personnel continue to increase the uplink attenuation value of the uplink regulator until the average RSSI value is <-90dBm, or the uplink attenuation value has reached its maximum.

[0141] Step S8: On-site maintenance personnel use a test mobile phone to conduct uplink tests on the on-site wireless signal. Select one wireless indoor distribution floor and conduct uplink CQT tests at the end of the antenna feeder branch near the floor. It is recommended that the test service type be uplink small packet test and the test duration be about 1 minute.

[0142] Step S9: After the CQT test is completed, the test log is parsed in real time, and the proportion of sampling points where PUSCH Txpower exceeds the rated maximum value is counted.

[0143] Step S10: When the proportion of sampling points exceeding the rated maximum value of PUSCH Txpower is too high (e.g., higher than 50%), the field maintenance personnel shall reasonably reduce the uplink attenuation value of the uplink regulator until the proportion of sampling points exceeding the rated maximum value of PUSCH Txpower is reduced to the preset value.

[0144] The above description is only a preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A combining system, characterized in that, include: The device comprises a first wireless source device, a second wireless source device, a first combiner, a second combiner, and multiple branch combiners, wherein... The first wireless source device is connected to the first combiner. The first wireless source device is used to generate wireless radio frequency signals. The first combiner is used to receive and aggregate the wireless radio frequency signals from the first wireless source device and send the aggregated wireless radio frequency signals to the branch feeder. The branch feeder is used to perform power distribution and path extension on the received wireless radio frequency signals. The second wireless signal source device is connected to the second combiner, wherein the second wireless signal source device is used to generate wireless radio frequency signals, and the second combiner is used to receive and aggregate the wireless radio frequency signals from the second wireless signal source device, and send the aggregated wireless radio frequency signals to the branch feeder; The first combiner is connected to the plurality of branch combiners via a first main feeder, and the second combiner is connected to the plurality of branch combiners via a second main feeder. One or more of the plurality of branch combiners are respectively connected to the branch feeder, wherein the plurality of branch combiners are located at the intersection of the first main feeder, the second main feeder and the branch feeder.

2. The combining system according to claim 1, characterized in that, The first wireless signal source device includes: multiple wireless signal source devices in different wireless frequency bands managed by a first telecommunications operator; the second wireless signal source device includes: multiple wireless signal source devices in different wireless frequency bands managed by a second telecommunications operator, wherein the first telecommunications operator and the second telecommunications operator are different telecommunications operators.

3. The combining system according to claim 1, characterized in that, The first wireless source device includes: multiple frequency division duplex wireless source devices managed by different communication operators; the second wireless source device includes: multiple time division duplex wireless source devices managed by different communication operators.

4. A combining system, characterized in that, include: The system comprises a first wireless source device, a second wireless source device, a first combiner, and multiple branch combiners, wherein... The first wireless signal source device is connected to the plurality of branch combiners through a first trunk feeder. The first wireless signal source device is used to generate a wireless radio frequency signal and send the wireless radio frequency signal to the branch feeder. The branch feeder is used to perform power distribution and path extension on the received wireless radio frequency signal. The second wireless signal source device is connected to the first combiner, wherein the second wireless signal source device is used to generate wireless radio frequency signals, and the first combiner is used to receive and aggregate the wireless radio frequency signals from the second wireless signal source device, and send the aggregated wireless radio frequency signals to the branch feeder; The first combiner is connected to the plurality of branch combiners via the second main feeder. One or more of the plurality of branch combiners are respectively connected to the branch feeder. The plurality of branch combiners are located at the intersection of the first main feeder, the second main feeder and the branch feeder.

5. The combining system according to claim 4, characterized in that, The first wireless signal source device includes: a multi-frequency, multi-mode, frequency division duplex wireless signal source device.

6. The combining system according to claim 5, characterized in that, The combining system further includes an uplink conditioner, wherein the uplink conditioner is connected to a first coupler in the first wireless source device and the first backbone feeder, respectively, wherein the uplink conditioner is used to receive and separate uplink radio frequency signals from different frequency bands from the first wireless source device, and to selectively attenuate uplink radio frequency signals in a specific frequency band.

7. The combining system according to claim 6, characterized in that, The uplink regulator is located at the radio frequency channel port of the first wireless source device; or, the uplink regulator is located between the first wireless source device and the junction node.

8. The combining system according to claim 6, characterized in that, The uplink regulator includes a multi-band filter combining submodule and a wireless radio frequency attenuation submodule. The multi-band filter combining submodule is used to receive and separate uplink wireless radio frequency signals from different frequency bands from the first wireless source device. The wireless radio frequency attenuation submodule is used to attenuate the signal strength of uplink wireless radio frequency signals in a specific frequency band by adjusting a preset attenuation value.

9. The combining system according to claim 8, characterized in that, The wireless radio frequency attenuation submodule is connected in series with the connectors between the input and output ports of the upper and lower cavities of the multi-band filter combining submodule via a standard radio frequency interface.

10. The combining system according to claim 8, characterized in that, The wireless radio frequency attenuation submodule includes one or more radio frequency signal channels, each of which is used to transmit uplink wireless radio frequency signals in a specific frequency band. A fixed attenuation resistor is connected in series in each of the radio frequency signal channels to provide a preset base attenuation.

11. The combining system according to claim 10, characterized in that, The wireless radio frequency attenuation submodule is also provided with multiple operable components on its exterior. Each operable component corresponds to a double-pole double-throw switch inside the wireless radio frequency attenuation submodule. When any operable component is pressed, the double-pole double-throw switch corresponding to that operable component closes, connecting the corresponding variable attenuation resistor to the radio frequency signal channel, so as to attenuate the signal strength of the uplink wireless radio frequency signal of a specific frequency band through a specific attenuation value.

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