Indoor distribution system and signal transmission method

Abstract

The present disclosure provides an indoor distribution system and a signal transmission method. The system comprises: an access unit, an extension unit, a first coupling unit and at least one remote cascade chain; wherein each remote cascade chain comprises: at least one second coupling unit and at least one remote unit; the remote unit comprises a signal processing module; at least one second coupling unit in each remote cascade chain is cascade-connected, and each remote unit is respectively connected to its corresponding second coupling unit; the first coupling unit is used to send the radio frequency signal transmitted by the extension unit to the second coupling unit; the second coupling unit is used to send the radio frequency signal of input power to the remote unit connected to the second coupling unit according to the coupling degree; the remote unit is used to adjust the power of the radio frequency signal from the input power to the target power output through the signal processing module according to the input power and the target power, thereby reducing the difficulty of design and construction, improving the efficiency of design and construction, and increasing the feasibility of the indoor distribution system.

Description

Technical Field

[0001] The present disclosure relates to the field of communication technology, and in particular to an indoor distribution system and a signal transmission method. Background Art

[0002] The coupling unit in the simulated indoor distribution system is used to adjust the power of the signal output by the extension unit and send it to the remote unit.

[0003] When constructing a simulated indoor distribution system, the coupling degree design of the coupling unit needs to consider multiple factors such as feeder loss, input signal strength, and power of the destination node. For example, the farther the coupling unit (and the remote unit connected to it) is from the extension unit, the smaller the input power during the transmission process, and the smaller the coupling degree needs to be designed. If multi-stage antenna deployment is required, multiple coupling units need to be deployed according to different coupling degree requirements, and the relative positions of different coupling units with other coupling units in the system cannot be changed, which will increase the difficulty of construction. Summary of the invention

[0004] In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides an indoor distribution system and a signal transmission method.

[0005] In a first aspect, the present disclosure provides an indoor distribution system, comprising: an access unit, an extension unit, a first coupling unit and at least one remote cascade chain; wherein each of the remote cascade chains comprises: at least one second coupling unit and at least one remote unit; the remote unit comprises a signal processing module;

[0006] At least one second coupling unit in each of the remote cascade chains is connected in cascade, and each of the remote units is respectively connected to its corresponding second coupling unit;

[0007] The first coupling unit is used to send the radio frequency signal transmitted by the extension unit to the second coupling unit;

[0008] The second coupling unit is used to send a radio frequency signal of input power to the remote unit connected to the second coupling unit according to the coupling degree;

[0009] The remote unit is used to adjust the power of the radio frequency signal from the input power to the target power output through the signal processing module according to the input power and the target power.

[0010] In a second aspect, the present disclosure provides a signal transmission method, which is applied to an indoor distribution system, wherein the indoor distribution system comprises: an access unit, an extension unit, a first coupling unit and at least one remote cascade chain; wherein each remote cascade chain comprises: at least one second coupling unit and at least one remote unit; the remote unit comprises a signal processing module; at least one second coupling unit in each remote cascade chain is cascade-connected, and each remote unit is respectively connected to its corresponding second coupling unit; the method comprises:

[0011] The first coupling unit sends the radio frequency signal transmitted by the extension unit to the second coupling unit;

[0012] The second coupling unit sends a radio frequency signal of input power to the remote unit connected to the second coupling unit according to the coupling degree;

[0013] The remote unit adjusts the power of the radio frequency signal from the input power to the target power output through the signal processing module according to the input power and the target power.

[0014] Compared with the prior art, the technical solution provided by the present invention has the following advantages:

[0015] The second coupling unit divides its output power according to the coupling degree, and sends the radio frequency signal to the remote unit connected thereto and the second coupling unit of the next level. The remote unit automatically controls the gain of its signal processing module according to the input power and the target power, and adjusts the power of the radio frequency signal from the input power to the target power output. The input power of the radio frequency signal received by each remote unit is not the same, but it can output the radio frequency signal of the target power through self-adjustment, so that the second coupler in the remote cascade chain can be set to one type, thereby reducing the difficulty of design and construction, improving the efficiency of design and construction, and increasing the feasibility of the indoor distribution system. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and, together with the description, serve to explain the principles of the present disclosure.

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a partial structural schematic diagram of an indoor distribution system in the prior art;

[0019] Figure 2 A schematic diagram of the structure of an indoor distribution system provided by an embodiment of the present disclosure;

[0020] Figure 3 A schematic diagram of the structure of a remote unit provided in an embodiment of the present disclosure;

[0021] Figure 4 A topological architecture and structural diagram of a coupling unit provided in an embodiment of the present disclosure;

[0022] Figure 5 A topological architecture and structural schematic diagram of another coupling unit provided in an embodiment of the present disclosure;

[0023] Figure 6 A schematic diagram of the structure of another remote unit provided in an embodiment of the present disclosure;

[0024] Figure 7 A schematic diagram of the structure of another indoor distribution system provided in an embodiment of the present disclosure.

[0025] Figure 8 A structural schematic diagram of another indoor distribution system provided by an embodiment of the present disclosure;

[0026] Fig. 9 A schematic diagram of the structure of an extension unit provided in an embodiment of the present disclosure;

[0027] Fig.10 A schematic diagram of the structure of an access unit provided in an embodiment of the present disclosure;

[0028] Fig.11 A schematic diagram of the structure of a first circuit provided in an embodiment of the present disclosure;

[0029] Fig.12 A schematic diagram of the structure of a second circuit provided in an embodiment of the present disclosure;

[0030] Fig.13 A schematic diagram of the structure of a third circuit provided in an embodiment of the present disclosure;

[0031] Fig.14 A schematic diagram of the structure of a fourth circuit provided in an embodiment of the present disclosure;

[0032] Fig.15 A flowchart of a signal transmission method provided in an embodiment of the present disclosure.

[0033] Description of reference numerals:

[0034] 100: access unit; 110: first digital processing module; 120: first optical transceiver module; 130: first circuit; 140: second circuit; 150: third circuit; 160: fourth circuit; 200: extension unit; 210: second digital processing module; 220: signal conversion module; 230: second optical transceiver module; 300: first coupling unit; 400: remote cascade chain; 410: second coupling unit; 420: remote unit; 421: signal processing module; 422: monitoring processing module. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned objectives, features and advantages of the present disclosure, the scheme of the present disclosure will be further described below. It should be noted that the embodiments of the present disclosure and the features in the embodiments can be combined with each other without conflict.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present disclosure, but the present disclosure may also be implemented in other ways different from those described herein; it is obvious that the embodiments in the specification are only part of the embodiments of the present disclosure, rather than all of the embodiments.

[0037] In some scenarios, when designing and constructing indoor distribution systems, the coupling degree (power ratio of each output end) of the coupling unit needs to take into account multiple factors such as feeder length, feeder loss, input signal strength, and power of the destination node.

[0038] For example, Figure 1 This is a partial structural diagram of an indoor distribution system in the prior art. The indoor distribution system includes: an access unit, an extension unit, a first coupling unit and at least one remote cascade chain (here it is assumed to be a remote cascade chain); each remote cascade chain includes: at least one second coupling unit and at least one remote unit (here it is assumed that the remote cascade chain includes a cascade-connected second coupling unit 1, a second coupling unit 2 and a second coupling unit 3), and each second coupling unit is connected to a remote unit. Assuming that the power loss of the transmission line is not considered, that is, the power loss of the transmission line is zero, the output power of the first coupling unit is P, and the input power of the remote unit is P / 4, then the coupling degree of the second coupling unit (the coupling degree is defined as the ratio of the power of each output end) is respectively:

[0039] The coupling degree of the second coupling unit 1 is (P-0.25P) / 0.25P=3:1;

[0040] The coupling degree of the second coupling unit 2 is (P-0.25P-0.25P) / 0.25P=2:1;

[0041] The coupling degree of the second coupling unit 3 is (P-0.25P-0.25P-0.25P) / 0.25P=1:1;

[0042] Then three different coupling units need to be used in the remote cascade chain to complete the design of the indoor distribution system.

[0043] From the above, it can be seen that if multi-level deployment of coverage points is required, multiple coupling units need to be deployed according to different coupling degree requirements, and the relative positions of different coupling units with other coupling units in the system cannot be changed, which increases the difficulty of construction and has low maintainability.

[0044] In other scenarios, in order to reduce the difficulty of construction, the indoor distribution system provided by the embodiment of the present disclosure deploys coupling units with the same coupling degree on each remote cascade chain. The remote units automatically adjust the power of the RF signal to the target power and output the RF signal at the target power, thereby reducing the difficulty of construction and improving the design and construction efficiency of the indoor distribution system.

[0045] Figure 2 A schematic diagram of the structure of an indoor distribution system provided by an embodiment of the present disclosure is shown in FIG. Figure 1 As shown, the system of this embodiment may include:

[0046] Access unit 100, extension unit 200, first coupling unit 300 and at least one remote cascade chain 400, wherein each remote cascade chain 400 comprises: at least one second coupling unit 410 and at least one remote unit 420; the remote unit 420 comprises a signal processing module;

[0047] At least one second coupling unit 410 in each remote cascade chain 400 is connected in cascade, and each remote unit 420 is connected to its corresponding second coupling unit 410 respectively;

[0048] The first coupling unit 300 is configured to send the radio frequency signal transmitted by the extension unit to the second coupling unit.

[0049] The second coupling unit 410 is configured to send a radio frequency signal of input power to a remote unit 420 connected to the second coupling unit 410 according to the coupling degree.

[0050] The remote unit 420 is used to control the gain of the signal processing module according to the input power and the target power, and adjust the power of the radio frequency signal from the input power to the target power output.

[0051] Optionally, the access unit 100 is used to complete optional analog-to-digital conversion, as well as processing of data on related input paths, interface conversion, and rate adjustment, and transmit the processed signal to the extension unit 200.

[0052] Optionally, the extension unit 200 is used to complete the aggregation, distribution, analog-to-digital conversion of the interface data of the access unit 100, and is connected to the coupling unit for input and output of radio frequency signals.

[0053] Optionally, the remote unit 420 is used to perform amplification, gain control, and optional clock signal extraction, recovery, and frequency conversion functions on the RF signal.

[0054] In practical applications, the access unit 100 receives a signal sent by a base station or a core network, and sends the signal to the extension unit 200. The extension unit 200 converts the signal into a radio frequency signal and sends it to each remote cascade chain 400 through the first coupling unit 300. The first coupling unit 300 is respectively connected to the first-stage second coupling unit 410 in each remote cascade chain 400. The first-stage second coupling unit 410 of each remote cascade chain 400 receives the radio frequency signal. Each second coupling unit 410 sends the radio frequency signal to the remote unit 420 connected thereto and the second coupling unit 410 of the next stage according to its own coupling degree. The last-stage second coupling unit 410 can be connected to two remote units 420. Correspondingly, each remote unit 420 receives the radio frequency signal, obtains the input power of the received radio frequency signal, and controls its own signal processing module to adjust the power of the radio frequency signal from the input power to the target power output according to the input power and the target power. For example, the attenuator connected to the signal processing module can be adjusted according to the input power and the target power, so that the power of the radio frequency signal output by the remote unit 420 is the target power. The target power is preset, and each remote unit 420 may be set with the same target power, so that the signal is evenly covered.

[0055] Optionally, the coupling degrees of the second coupling units 410 included in each remote cascade chain 400 are the same.

[0056] In practical applications, the coupling degree of the second coupling unit 410 included in each remote cascade chain 400 is the same, and the same coupling unit can be selected. The remote units 420 are also the same. Each remote unit 420 can automatically adjust to output a radio frequency signal of a target power, thereby making design and construction more convenient and improving the efficiency of design and construction.

[0057] Exemplarily, it is assumed that the indoor distribution system includes a remote cascade chain 400, and the remote cascade chain 400 includes three second coupling units 410 connected in cascade. For example, the three second coupling units 410 are respectively marked as second coupling unit 1, second coupling unit 2, and second coupling unit 3, wherein the second coupling unit 3 is respectively connected to two remote units 420, the second coupling unit 1, the second coupling unit 2, and the second coupling unit 3 are connected in sequence, the second coupling unit 1 is connected to the first coupling unit 300, the second coupling unit 1, the second coupling unit 2, and the second coupling unit 3 are all coupling units with a coupling degree of 3:1, the output power of the first coupling unit 300 is P, and the target power is P / 4.

[0058] Since the remote unit 420 has an output power control function, once the target power is determined, the remote unit 420 can automatically calculate the gain, thereby adjusting the RF signal of the target power output. In this hypothetical case, the remote unit 420 can automatically adjust its gain (the ratio of the target power to the input power) according to the input power to: 0.25P / 0.25P=1, 0.25P / 0.1875P=1.33, 0.25P / 0.1406P=1.78 and 0.25P / 0.4218P=0.59, so that each remote unit 420 can output a RF signal of 0.25P power. In this hypothetical case, the same second coupling unit 410 can be used in the remote cascade chain 400.

[0059] Furthermore, the coupling degree of the first coupling unit is the same as that of the second coupling unit.

[0060] Optionally, the coupling degrees of the second coupling units 410 included in different remote cascade chains 400 are the same or different.

[0061] The coupling degrees of the second coupling units 410 included in different remote cascade chains 400 may be the same or different, that is, the second coupling units 410 included in different remote cascade chains 400 may be the same type of coupling units or different types of coupling units.

[0062] When the coupling degrees of the second coupling units 410 included in different remote cascade chains 400 are the same, that is, the second coupling units 410 and the remote units 420 in the indoor distribution system are the same, the overall design and construction difficulty of the indoor distribution system is reduced.

[0063] When the coupling degrees of the second coupling units 410 included in different remote cascade chains 400 are different, the respective remote cascade chains 400 are more convenient in design and construction. Different remote cascade chains 400 are deployed at different physical locations, for example, different floors. The coupling degrees of the second coupling units 410 included in different remote cascade chains 400 are different, but the coupling degrees of the second coupling units 410 included in the remote cascade chains 400 are the same. Each remote cascade chain 400 is more convenient in design and construction, thereby making it more convenient in design and construction of the indoor distribution system, and reducing the difficulty of design and construction.

[0064] In this embodiment, the second coupling unit divides its output power according to the coupling degree, and sends the radio frequency signal to the remote unit connected thereto and the second coupling unit of the next stage. The remote unit automatically controls the gain of its signal processing module according to the input power and the target power, and outputs the radio frequency signal of the target power. The input power of the radio frequency signal received by each remote unit is not the same, but it can output the radio frequency signal of the target power through self-adjustment, so that the second coupler in the remote cascade chain can be set to one type, thereby reducing the difficulty of design and construction, improving the efficiency of design and construction, and increasing the feasibility of the indoor distribution system.

[0065] Figure 3 A schematic diagram of the structure of a remote unit provided in an embodiment of the present disclosure is shown in FIG. Figure 3 is Figure 2 Based on the embodiment shown, further, as Figure 3 As shown, the signal processing module 421 includes: an attenuator, a switch and an amplifier. The remote unit of this embodiment also includes: a monitoring processing module 422. The monitoring processing module 422 includes: an input signal detection module and a monitoring module.

[0066] The monitoring module is connected to the input signal detection module and the output signal detection module respectively; the attenuator is connected to the switch and the amplifier in turn; the monitoring module is connected to the attenuator and the switch respectively;

[0067] The attenuator is used to receive the radio frequency signal of the input power sent by the second coupling unit.

[0068] The input signal detection module is used to determine the input power and send the input power to the monitoring module.

[0069] The monitoring module is used to adjust the attenuator and the switch according to the input power and the target power so that the amplifier outputs the radio frequency signal of the target power.

[0070] Optionally, the input signal detection module is further used to implement characteristic detection of the input signal. The characteristic detection of the input signal may include but is not limited to detecting one or more of the following characteristics: input power, standing wave, signal type, and signal status.

[0071] Optionally, the monitoring module is also used for input signal monitoring and / or output signal monitoring, etc.

[0072] Optionally, the remote unit may further include: an output signal detection module.

[0073] The output signal detection module is used to implement characteristic detection of the output signal. The characteristic detection of the output signal may include but is not limited to detecting one or more of the following characteristics: output power, standing wave, signal type, signal status, etc.

[0074] Optionally, the signal processing module 421 also includes a frequency converter.

[0075] In actual applications, the remote unit receives the RF signal of the input power sent by the second coupling unit, the input signal detection module detects the RF signal, determines the input power, and sends the input power to the monitoring module. The monitoring module determines the gain value based on the input power (input signal strength) and the target power, and controls the attenuator and switch on the signal transmission link to make the amplifier output the RF signal of the target power.

[0076] In this embodiment, the monitoring module determines the gain value according to the input power and the target power determined by the input signal detection module, and controls the attenuator and the switch on the signal transmission link to make the amplifier output the RF signal of the target power, thereby achieving the effect of gain control, so that when the input power is of different values, the remote unit can automatically adjust according to the target power, thereby outputting the RF signal of the target power, so that the second coupler in the remote cascade chain can be set to one type, thereby reducing the difficulty of design and construction and improving the efficiency of design and construction.

[0077] On the basis of the above embodiment, further, the extension unit is used to send a power supply signal and a radio frequency signal to the first coupling unit.

[0078] The first coupling unit is used to send a power supply signal and a radio frequency signal to the first remote cascade chain.

[0079] The second coupling unit is used to send a power supply signal and a radio frequency signal to the remote unit connected to the second coupling unit and other second coupling units connected to the second coupling unit, respectively.

[0080] In practical applications, the power supply of the first coupling unit and the remote cascade chain can be provided by the extension unit, that is, in addition to transmitting the RF signal to the remote cascade chain via the first coupling unit, the extension unit can also provide the power supply voltage to the first coupling unit and the remote cascade chain through the transmission line. The extension unit sends a power supply signal and a RF signal to the first coupling unit, and the first coupling unit separates the power supply signal and the RF signal, and then branches the power supply signal and the RF signal according to the number of connected remote cascade chains. Correspondingly, when the second coupling unit in the remote cascade chain receives the power supply signal and the RF signal, it also first separates the power supply signal from the RF signal, and then combines them and sends them to the second coupling unit and the remote unit of the next level respectively.

[0081] In this embodiment, the power supply signal of the first coupling unit and the remote cascade chain is provided by the extension unit together with the radio frequency signal. The power supply signal can use the existing radio frequency signal transmission line. The number of unit devices in the remote cascade chain in the indoor distribution system is more than the number of extension units. Therefore, a large number of external power lines can be saved, the construction difficulty is reduced, and the construction efficiency of the indoor distribution system is improved.

[0082] In other scenarios, since digital indoor distribution systems can be transmitted using optical fiber or Ethernet cables, with the application of high bandwidth in the 5G era, the specifications of optical modules or electrical modules are getting higher and higher. Taking the shared application of 5G indoor distribution system as an example, if the remote unit implements four-transmit four-receive (4T4R) multiple-input multiple-output (MIMO), dual carriers, each carrier has 100MHz transmission, and uses the standard CPRI 8.0 protocol, then the required bandwidth is: 2 [1] *122.88Mbps [2] *2 [3] *15 [4] *(16 / 15) [5] *(10 / 8) [6] *4 [7] =39321.6Mbps,

[0083] Wherein, [1]2 represents the number of two carriers (carrier number);

[0084] [2] 122.88 Mbps represents the standard sampling rate of a 100 MHz signal;

[0085] [3]2 represents I / Q data;

[0086] [4]15 indicates the standard transmission bit width of 15 bits;

[0087] [5] 16 / 15 represents the control overhead of Common Public Radio Interface (CPRI) transmission;

[0088] [6] 10 / 8 represents the cost of photoelectric conversion;

[0089] Ethernet transmission (based on 802.3ae protocol) supports up to 10Gbps, requiring at least four Category 7 (Cat7) cables for transmission. The extension unit and remote unit also need to support four 10G network processors, increasing the cost and complexity of the indoor distribution system. Using optical fiber transmission and the industry's 25Gbps optical modules and FPGA devices also requires two sets of optical modules and FPGA interfaces. However, this increases the cost and complexity of the indoor distribution system.

[0090] Furthermore, in one embodiment of the present disclosure, a solution of using a radio frequency cable or a feeder line can save a large amount of optoelectronic interface resources, thereby saving overall costs and reducing the complexity of the indoor distribution system.

[0091] In one possible design, each level of unit equipment after the extension unit in the indoor distribution system is connected by a radio frequency cable.

[0092] At least one second coupling unit in each remote cascade chain is cascade-connected via a radio frequency cable, and each second coupling unit is respectively connected to a remote unit via a radio frequency cable; the first coupling unit is respectively connected to the first-stage second coupling unit in each remote cascade chain via a radio frequency cable.

[0093] Optionally, the radio frequency cable may be a bundled cable.

[0094] Figure 4 A topological architecture and structural diagram of a coupling unit provided in an embodiment of the present disclosure, such as Figure 4 As shown, the coupling unit includes: a power supply processing module and a radio frequency coupling module. The coupling unit can be a first coupling unit or a second coupling unit. The power supply processing module can include but is not limited to one or more of the following processing methods: input voltage detection, input current detection, input power signal filtering, output power shunting, output voltage filtering, output power detection, etc. The radio frequency coupling module can include but is not limited to any one or any combination of the following processing methods: input signal filtering, and shunting the radio frequency signal of the input signal to the output port.

[0095] In this embodiment, the coupling unit separates the power supply and the RF signal through a RF cable, and sends it to the next-level coupling unit or remote unit after processing by the coupling unit. The use of RF cables can save costs compared to using optical fiber transmission. At the same time, for more and more 4T4R application scenarios in 5G indoor distribution systems, the analog indoor distribution system needs to deploy more feeders and couplers, which increases the overall construction difficulty and high cost. This application example can meet the 4T4R requirements through a RF cable solution with only one deployment. In addition, in later maintenance, since each remote unit can be controlled individually, the designated remote unit can be individually controlled to shut down or reduce the transmission power during idle periods and areas with sparse traffic, so as to achieve the purpose of energy saving and emission reduction. This is also a function that is difficult to accomplish with an analog indoor distribution system.

[0096] In another possible design, each level of unit equipment after the extension unit in the indoor distribution system can be connected by a feeder line.

[0097] At least one second coupling unit in each remote cascade chain is cascade-connected via a feeder, and each second coupling unit is respectively connected to a remote unit via a feeder; the first coupling unit is respectively connected to the first-stage second coupling unit in each remote cascade chain via a feeder.

[0098] Figure 5 A topological architecture and structural diagram of another coupling unit provided in an embodiment of the present disclosure, such as Figure 5 As shown, the coupling unit may include a shunt module, a power supply processing module, a radio frequency coupling module, and a combining module. The coupling unit may be a first coupling unit or a second coupling unit. Among them, the shunt module separates the power supply signal and the radio frequency signal through a filter. The power supply processing module may include but is not limited to one or more of the following processing methods: input voltage detection, input current detection, input power signal filtering, output power shunt, output voltage filtering, output power detection, etc. The radio frequency coupling module may include but is not limited to one or more of the following processing methods: input signal filtering, and shunt the radio frequency signal of the input signal to the output port. The combining module combines the power supply and radio frequency signals through a combiner and outputs them to the next level coupling unit or remote unit.

[0099] In this embodiment, the power supply signal and the radio frequency signal of the extension unit are transmitted to the coupling unit through the feeder line, and the power supply signal and the radio frequency signal are separated in the coupling unit and sent to the next-level coupling unit or the remote unit, thereby saving optical devices.

[0100] Correspondingly, the remote unit is connected to the second coupling unit for extracting power supply, generating monitoring information, processing radio frequency signals and sending them to the antenna.

[0101] Figure 6A schematic diagram of the structure of another remote unit provided in an embodiment of the present disclosure, Figure 6 On the basis of the above embodiments, further, Figure 6 As shown, the remote unit includes a signal separation module, a power module, a signal processing module, a monitoring processing module and an antenna module.

[0102] Among them, the signal separation module can be used to separate the power supply signal, radio frequency signal, and monitoring signal, and send the separated power supply signal, radio frequency signal, and monitoring signal to the power supply module, signal processing module, and monitoring processing module respectively.

[0103] The functions of the signal separation module may include but are not limited to one or more of the following: DC signal separation, DC signal filtering, RF signal detection and filtering, RF signal output power adjustment, monitoring signal modulation and demodulation, etc.

[0104] The power supply module is used to process the power supply signal sent by the signal separation module, and then distribute it to the monitoring processing module and the signal processing module as a power supply. The functions of the power supply module may include but are not limited to one or more of the following processing methods: input voltage detection, input current detection, input power signal filtering, output voltage filtering, output power detection, etc.

[0105] The signal processing module is used to perform signal processing in the RF field on the RF signal transmitted by the signal separation module, and then transmit it to the antenna module. In addition, the signal received by the antenna module from the air is also processed in the RF field and sent to the signal separation module. Signal processing in the RF field may include but is not limited to one or more of the following processing methods: RF signal filtering, RF signal amplification, RF signal attenuation, RF up-conversion, RF down-conversion, envelope signal extraction and comparison, time division duplexing (TDD) signal switch control, output signal power control, output port standing wave detection, output port power detection, etc.

[0106] The monitoring processing module is used to generate a monitoring signal for the remote unit and transmit it to the signal processing module. The monitoring processing module includes but is not limited to one or more of the following processing methods: key indicator monitoring and management, alarm monitoring and reporting, software upgrade and rollback, status quantity reporting, etc.

[0107] The antenna module is used to transmit the signal transmitted by the signal processing module into the air, and at the same time send the radio frequency signal in the air to the signal processing module.

[0108] Figure 7 A schematic diagram of the structure of another indoor distribution system provided by an embodiment of the present disclosure, Figure 7 is Figure 2-Figure 6Based on the embodiment shown, further, as Figure 7 As shown,

[0109] The access unit 100 includes a first digital processing module 110, and the extension unit 200 includes a second digital processing module 210 and a signal conversion module 220;

[0110] The extension unit 200 is connected to the first coupling unit 300; the extension unit 200 is directly connected to the access unit 100, or is connected to the access unit 100 through other extension units 200;

[0111] The access unit 100 is configured to perform a first process on a received signal through the first digital processing module 110 to obtain a first digital signal, and send the first digital signal to the extension unit 200;

[0112] The expansion unit 200 is used to perform a second process on the first digital signal through the second digital processing module 210 and the signal conversion module 220 to obtain a first analog signal; and send the first analog signal to the first coupling unit 300.

[0113] Optionally, the access unit 100 may be connected to one or more extension units 200. There may be one or more extension units 200 on the link between the access unit 100 and any first coupling unit 300.

[0114] Optionally, the first digital processing module 110 may include, but is not limited to, one or more of the following: Field Programmable Gate Array (FPGA), Application Specific Integrated Circuits (ASIC), Complex Programmable Logic Device (CPLD), etc., which are not limited in the present disclosure.

[0115] Optionally, the second digital processing module 210 may include, but is not limited to, one or more of the following: Field Programmable Gate Array (FPGA), Application Specific Integrated Circuits (ASIC), Complex Programmable Logic Device (CPLD), etc., which are not limited in the present disclosure.

[0116] Optionally, the access unit 100 is connected to the extension unit 200 via an optical fiber or a network cable. When the extension unit 200 is connected to other extension units 200, they are connected via an optical fiber or a network cable.

[0117] In practical applications, the access signal of the access unit 100 may be a signal transmitted by a radio remote unit of a base station, which is an analog signal, or may be a signal transmitted by a baseband processing unit or a core network of a base station, which is a digital signal.

[0118] When the access signal of the access unit 100 is an analog signal, the access unit 100 converts the analog signal into a digital signal, inputs it into the first digital processing module 110, obtains a first digital signal, and then sends the first digital signal to the second digital processing module 210 of the extension unit 200.

[0119] When the access signal of the access unit 100 is a digital signal, the access unit 100 inputs the digital signal into the first digital processing module 110 to obtain a first digital signal, and then sends the first digital signal to the second digital processing module 210 of the extension unit 200 .

[0120] The second digital processing module 210 and the signal conversion module 220 in the extension unit 200 process the first digital signal, wherein the processing performed by the second digital processing module 210 includes one or more of the following processing: digital combining, signal framing, signal deframing, signal serial-to-parallel conversion, signal parallel-to-serial conversion, clock recovery, digital up-conversion processing, digital down-conversion processing, monitoring signal extraction and processing. The second digital processing module 210 transmits the processed first digital signal to the signal conversion module 220. The signal conversion module 220 can be used to perform digital-to-analog conversion on the signal transmitted by the second digital processing module 210, and send the first analog signal obtained by the digital-to-analog conversion to the first coupling unit 300. Accordingly, the signal conversion module 220 can also be used to perform analog-to-digital conversion on the analog signal transmitted by the first coupling unit 300, and transmit the digital signal obtained by the analog-to-digital conversion to the second digital processing module 210.

[0121] In this embodiment, the related devices for digital signal processing are usually expensive. By concentrating the digital processing capabilities in the access unit and the extension unit, the related devices for digital signal processing are placed in the access unit and the extension unit, and the signal transmitted by the extension unit to the remote cascade chain through the first coupling unit is an analog signal, thereby constructing a "digital + analog" indoor distributed system. With the development of indoor distribution systems, the number of remote units is greater than the number of access units and extension units. Therefore, the "digital + analog" indoor distributed system can save a large number of related devices for digital signal processing, thereby reducing costs, thereby making the system capacity expandable and simple to construct and operate.

[0122] Figure 8 A structural diagram of another indoor distribution system provided in an embodiment of the present disclosure is shown in FIG. Figure 8 is Figure 7 Based on the embodiment shown, further, as Figure 8 As shown, the access unit 100 further includes a first optical transceiver module 120; the extension unit 200 further includes a second optical transceiver module 230;

[0123] The first optical transceiver module 120 is connected to the second optical transceiver module 230 via an optical fiber.

[0124] Among them, the first optical transceiver module 120 is used to convert the electrical signal output by the first digital processing module into an optical signal, thereby transmitting the converted optical signal through optical fiber, and can also be used to convert the optical signal received through the extension unit 200 into an electrical signal, thereby sending the converted electrical signal to the first digital processing module.

[0125] The second optical transceiver module 230 is used to convert the electrical signal output by the second digital processing module into an optical signal, thereby transmitting the converted optical signal through optical fiber. It can also be used to convert the optical signal received through the access unit 100 into an electrical signal, thereby sending the converted electrical signal to the second digital processing module.

[0126] Optionally, the first optical transceiver module 120 is further used to perform rate adjustment and protocol conversion on the signal sent by the first digital processing module, and then transmit it to the extension unit 200.

[0127] Optionally, the second optical transceiver module 230 is used to communicate and transmit the optical fiber signal from the access unit 100 or the extension unit 200, including but not limited to performing one or more of the following processing: interaction of communication protocols, matching of transmission rates, error correction and retransmission of optical fiber transmission, extraction of optical module information, etc., and connecting the processed data to the digital signal processing module.

[0128] Optionally, the second optical transceiver module 230 may include at least one optical transceiver device.

[0129] Optional, Fig. 9 A schematic diagram of the structure of an expansion unit provided in an embodiment of the present disclosure is shown in FIG. Fig. 9 is Figure 8 Based on the embodiment shown, further, as Fig. 9 As shown, the extension unit may further include: a third optical transceiver module, a monitoring management module and a radio frequency module.

[0130] Among them, the third optical transceiver module is used to communicate and transmit the optical fiber signal from the next-level expansion unit, including but not limited to performing one or more of the following processing: interaction of communication protocols, matching of transmission rates, error correction and retransmission of optical fiber transmission, extraction of optical module information, etc., and transmitting the processed data to the digital processing module.

[0131] Optionally, the third optical transceiver module may include at least one optical transceiver device.

[0132] The monitoring management module is used to generate monitoring signals for the extension unit and manage monitoring information for the remote unit. The generated monitoring information is transmitted to the signal conversion module, and the monitoring information transmitted by the signal conversion module is processed.

[0133] The RF module can be used to process the RF signal transmitted by the signal conversion module and send it to the coupling unit; the RF module can also be used to process the RF signal of the coupling unit and send it to the signal conversion module. The RF module can process the RF signal in one or more of the following ways: RF filtering, RF signal amplification, RF signal attenuation, RF up-conversion, RF down-conversion, envelope signal extraction and comparison, power detection, etc.

[0134] Optionally, the extension unit may further include: a feeding module.

[0135] Among them, the feeding module is used to power the first coupling unit and the remote cascade chain. The feeding module may include but is not limited to one or more of the following processing methods: AC-DC conversion, input voltage detection, input current detection, input power signal filtering, output voltage filtering, output power detection, etc.

[0136] Through the setting of the feeding module, a centralized feeding network is used in the system, and the remote units are remotely powered through the coupling unit, which can effectively reduce the construction difficulty.

[0137] In practical applications, the electrical signals to be transmitted between the access unit and the extension unit can be converted into optical signals through their respective optical transceiver modules, and the optical signals are transmitted through optical fibers.

[0138] In this embodiment, the optical signal is transmitted through the optical fiber, so that the signal transmission efficiency is higher and the output signal quality is better.

[0139] On the basis of the above embodiment, further, the signal received by the access unit includes one or more of the following signals: a first signal, a second signal, a third signal and a fourth signal;

[0140] Among them, the first signal is a signal sent by the radio remote unit (RRU) of the base station through a wireless coupler, the second signal is a signal sent by the radio remote unit of the base station through a wired coupler, the third signal is a signal sent by the baseband processing unit (BBU) of the base station, and the fourth signal is a signal sent by the core network.

[0141] In practical applications, the input signal of the access unit includes one or more of the following:

[0142] Wireless coupling input of a radio remote unit of a base station, including but not limited to input of an over-the-air radio frequency signal of a single or multiple radio remote units of a base station;

[0143] Wired coupled radio frequency signal input of the radio remote unit of the base station;

[0144] Digital signal input of the baseband processing unit of the base station, including the input based on the private protocol of the traditional BBU and the input based on the public protocol of the open base station processing unit (Open RAN BBU);

[0145] Business signal input of the core network unit.

[0146] This embodiment, through the flexible configuration of the access unit, meets the processing needs of different signal sources, including air-coupled RF signals, base station RF remote unit wire-coupled RF signals, base station baseband unit digital signals, and core network digital service signals, thereby realizing the input of multiple signal sources.

[0147] Fig.10 A schematic diagram of the structure of an access unit provided in an embodiment of the present disclosure is provided. Fig.10 is Figure 2-Figure 9 Based on any of the embodiments shown, further, as Fig.10 As shown, the access unit includes one or more of the following circuits: a first circuit 130, a second circuit 140, a third circuit 150 and a fourth circuit 160;

[0148] The first circuit 130 is connected to the radio remote unit of the base station through a wireless coupler, and the first circuit 130 is connected to the extension unit; the second circuit 140 is connected to the radio remote unit of the base station through a wired coupler, and the second circuit 140 is connected to the extension unit; the third circuit 150 is respectively connected to the baseband processing unit and the extension unit of the base station; the fourth circuit 160 is respectively connected to the core network and the extension unit;

[0149] The first circuit 130 is used to process the received first signal to obtain a processed first signal, and send the processed first signal to the extension unit;

[0150] The second circuit 140 is used to process the received second signal to obtain a processed second signal; and send the processed second signal to the extension unit;

[0151] The third circuit 150 is used to process the received third signal to obtain a processed third signal; and send the processed third signal to the extension unit;

[0152] The fourth circuit 160 is used for processing the received fourth signal to obtain a processed fourth signal; and sending the processed fourth signal to the extension unit.

[0153] In actual applications, the extension unit supports the first frequency band, the second frequency band, the third frequency band unit and the fourth frequency band unit, and the remote unit supports the first frequency band, the second frequency band, the third frequency band and the fourth frequency band; wherein the first frequency band is the frequency band corresponding to the radio frequency signal of the base station radio frequency remote unit in the air received by the access unit through a wireless coupler, the second frequency band is the frequency band corresponding to when the access unit is connected to the base station radio frequency remote unit through a wired coupler, the third frequency band is the frequency band corresponding to when the access unit is connected to the base station baseband processing unit, and the fourth frequency band is the frequency band corresponding to when the access unit is connected to the core network.

[0154] Optionally, the first digital processing module may include one or more of the following modules: a first digital processing sub-module, a second digital processing sub-module, a main control module and a control module, and the first photoelectric conversion module may include one or more of the following modules: a first optical module, a second optical module, a third optical module and a fourth optical module.

[0155] Optional, Fig.11 A schematic diagram of a first circuit structure provided by an embodiment of the present disclosure is shown in FIG. Fig.11 As shown, the first circuit includes: a first radio frequency processing module, a first digital processing submodule and a first optical module.

[0156] Among them, the first RF processing module is used to perform RF filtering (including multiple or single frequency selective filtering) on ​​the wireless coupled RF signal, adjust the gain of the filtered RF signal, convert the analog-to-digital signal, and then transmit the signal to the first digital processing submodule.

[0157] The first digital processing submodule is used to perform framing or deframing, synchronization signal extraction, digital filtering, sampling rate conversion on the signal transmitted by the first radio frequency processing module and then send it to the first optical module.

[0158] The first optical module is used to adjust the rate and perform protocol conversion on the signal received through the first digital processing submodule, and then transmit it to the extension unit.

[0159] In practical applications, the first circuit is connected to the base station radio remote unit through a wireless coupler, converts the wireless coupling radio frequency signal input by the base station radio remote unit into an optical signal, and then transmits the optical signal to the extension unit, so that the access unit can be used to process the radio remote unit of the base station accessed by the wireless coupler.

[0160] Optional, Fig.12 A schematic diagram of the structure of a second circuit provided in an embodiment of the present disclosure is shown in FIG. Fig.12 As shown, the second circuit includes: a second radio frequency processing module, a second digital processing submodule and a second optical module.

[0161] The second RF processing module is used to perform signal power detection, RF gain control, RF filtering, gain adjustment of the filtered RF signal, analog-to-digital conversion, and then transmit the wired coupled RF signal to the second digital processing submodule.

[0162] The second digital processing submodule is used to perform framing or deframing, synchronization signal extraction, digital filtering, sampling rate conversion on the signal transmitted by the second radio frequency processing module and then send it to the second optical module.

[0163] The second optical module is used to adjust the rate and perform protocol conversion on the signal received through the digital processing submodule, and then transmit it to the extension unit.

[0164] In practical applications, the second circuit is connected to the base station radio remote unit through a wired coupler, converts the wired coupled radio frequency signal input by the base station radio remote unit into an optical signal, and then transmits the optical signal to the extension unit.

[0165] Optional, Fig.13 A schematic diagram of the structure of a third circuit provided in an embodiment of the present disclosure is shown in FIG. Fig.13 As shown, the third circuit includes: a first-standard module, a main control module, and a third optical module, wherein the first-standard module includes but is not limited to one or more of the following modules: 2G module, 3G module, 4G module, 5G module, and NB-IoT module.

[0166] The 2G module is used to transmit the 2G standard electrical signal to the main control module through modulation and demodulation, framing or deframing, digital filtering and shaping;

[0167] The 3G module is used to transmit the 3G standard electrical signal to the main control module through modulation and demodulation, framing or deframing, digital filtering and shaping;

[0168] The 4G module is used to transmit the 4G standard electrical signal to the main control module through modulation and demodulation, framing or deframing, digital filtering and shaping. Optionally, when the 4G module is used as the main access module, it can use the traditional base station baseband processing unit protocol - Common Public Radio Interface (CPRI) or the enhanced Common Public Radio Interface protocol (eCPRI).

[0169] The 5G module is used to transmit 5G electrical signals to the main control module through modulation and demodulation, framing or deframing, digital filtering and shaping. Similarly, in actual implementation, when the 5G module is used as the main access module, it can adopt the traditional base station baseband processing unit protocol - CPRI, and also supports the use of eCPRI.

[0170] The NB-IoT module is used to transmit the NB-IoT standard electrical signals to the main control module through modulation and demodulation, framing or deframing, digital filtering and shaping.

[0171] The main control module is used to perform data merging, sampling rate conversion, and transmission rate matching on the signal transmitted by the first standard module, and transmit the signal to the third optical module.

[0172] The third optical module is used to adjust the rate and perform protocol conversion on the signal transmitted by the main control module, and then transmit it to the extension unit.

[0173] In actual applications, the third circuit is connected to the base station baseband processing unit through an optical fiber or a network cable, converts the electrical signal transmitted from the base station baseband processing unit into an optical signal, and then transmits the optical signal to the extension unit.

[0174] Optional, Fig.14 A schematic diagram of the structure of a fourth circuit provided in an embodiment of the present disclosure is shown in FIG. Fig.14 As shown, the fourth circuit includes: a second standard module, a control module and a fourth optical module, wherein the second standard module may include but is not limited to one or more of the following modules: a 2G communication module, a 3G communication module, a 4G communication module and a 5G communication module.

[0175] The 2G communication module is used to transmit the 2G standard electrical signal to the control module through the core network interface docking and baseband signal processing (2G signal encoding and decoding, modulation and demodulation, signaling processing);

[0176] The 3G communication module is used to transmit the 3G standard electrical signal to the control module through the core network interface docking and baseband signal processing (3G signal encoding and decoding, modulation and demodulation, signaling processing);

[0177] The 4G communication module is used to transmit the 4G standard electrical signal to the control module through the core network interface docking and baseband signal processing (4G signal encoding and decoding, modulation and demodulation, signaling processing);

[0178] The 5G communication module is used to transmit the 5G standard electrical signals to the control module through core network interface docking and baseband signal processing (5G signal encoding and decoding, modulation and demodulation, and signaling processing);

[0179] The control module is used to perform data merging, sampling rate conversion, and transmission rate matching on the signal transmitted by the second standard module, and transmit the signal to the fourth optical module;

[0180] The fourth optical module is used to adjust the rate and perform protocol conversion on the signal transmitted by the control module, and then transmit it to the extension unit.

[0181] In actual applications, the fourth circuit is connected to the core network via an optical fiber or a network cable, converts the electrical signal transmitted from the core network into an optical signal, and then transmits the optical signal to the extension unit.

[0182] In this embodiment, through the flexible configuration of the access unit, it is possible to meet the processing needs of different signal sources, including air-coupled RF signals, base station RF remote unit wired-coupled RF signals, base station baseband unit digital signals and / or core network digital service signals, and the input of multiple signal sources can be realized.

[0183] Fig.15 A flow chart of a signal transmission method provided in an embodiment of the present disclosure is applied to an indoor distribution system, the indoor distribution system including any indoor distribution system in the above system embodiments. The method provided in this embodiment may include:

[0184] S151. The first coupling unit sends a radio frequency signal transmitted by the extension unit to the second coupling unit.

[0185] S152: The second coupling unit sends a radio frequency signal of input power to a remote unit connected to the second coupling unit according to the coupling degree.

[0186] S153. The remote unit outputs a radio frequency signal of target power through a signal processing module according to the input power and the target power.

[0187] The implementation principle and technical effect of the method of this embodiment are similar to those of the above-mentioned system embodiment, and will not be repeated here.

[0188] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0189] The above description is only a specific embodiment of the present disclosure, so that those skilled in the art can understand or implement the present disclosure. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present disclosure. Therefore, the present disclosure will not be limited to the embodiments described herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An indoor distribution system, characterized in that: include: An access unit, an extension unit, a first coupling unit and at least one remote cascade chain; wherein each of the remote cascade chains comprises: at least two second coupling units and at least two remote units; the remote unit comprises a signal processing module; At least two second coupling units in each of the remote cascade chains are connected in cascade, and each of the remote units is connected to its corresponding second coupling unit respectively; The first coupling unit is used to send the radio frequency signal transmitted by the extension unit to the second coupling unit; The second coupling unit is used to send a radio frequency signal of input power to the remote unit connected to the second coupling unit according to the coupling degree; wherein the coupling degree of the second coupling units included in each of the remote cascade chains is the same; The remote unit is used to adjust the power of the RF signal from the input power to the target power output through the signal processing module according to the input power and the target power; wherein the target power corresponding to the remote units included in each of the remote cascade chains is the same.

2. The system according to claim 1, characterized in that The signal processing module includes: an attenuator, a switch and an amplifier; the remote unit also includes: a monitoring processing module, and the monitoring processing module includes: an input signal detection module and a monitoring module; The monitoring module is connected to the input signal detection module; the attenuator is connected to the switch and the amplifier in sequence; the monitoring module is connected to the attenuator and the switch respectively; The attenuator is used to receive the radio frequency signal of the input power sent by the second coupling unit; The input signal detection module is used to determine the input power and send the input power to the monitoring module; The monitoring module is used to adjust the attenuator and the switch according to the input power and the target power, so that the amplifier outputs the radio frequency signal of the target power.

3. The system according to claim 1, characterized in that The coupling degrees of the second coupling units included in different remote cascade chains are the same or different.

4. The system according to claim 1, characterized in that The access unit includes a first digital processing module, and the extension unit includes a second digital processing module and a signal conversion module; The extension unit is connected to the first coupling unit; the extension unit is directly connected to the access unit, or is connected to the access unit through another extension unit; The access unit is configured to perform a first process on the received signal through the first digital processing module to obtain a first digital signal, and send the first digital signal to the extension unit; The expansion unit is used to perform second processing on the first digital signal through the second digital processing module and the signal conversion module to obtain a first analog signal; and send the first analog signal to the first coupling unit.

5. The system according to claim 4, characterized in that The access unit further includes a first optical transceiver module; the extension unit further includes a second optical transceiver module; The first optical transceiver module is connected to the second optical transceiver module via an optical fiber.

6. The system according to claim 1, characterized in that The signal received by the access unit includes one or more of the following signals: a first signal, a second signal, a third signal, and a fourth signal; Among them, the first signal is a signal sent by the radio frequency remote unit of the base station through a wireless coupler, the second signal is a signal sent by the radio frequency remote unit of the base station through a wired coupler, the third signal is a signal sent by the baseband processing unit of the base station, and the fourth signal is a signal sent by the core network.

7. The system according to claim 6, characterized in that The access unit includes one or more of the following circuits: a first circuit, a second circuit, a third circuit and a fourth circuit; The first circuit is connected to the radio remote unit of the base station through the wireless coupler, and the first circuit is connected to the extension unit; the second circuit is connected to the radio remote unit of the base station through the wired coupler, and the second circuit is connected to the extension unit; the third circuit is connected to the baseband processing unit of the base station and the extension unit respectively; the fourth circuit is connected to the core network and the extension unit respectively; The first circuit is used to process the received first signal to obtain a processed first signal, and send the processed first signal to the extension unit; The second circuit is used to process the received second signal to obtain a processed second signal, and send the processed second signal to the extension unit; The third circuit is used to process the received third signal to obtain a processed third signal, and send the processed third signal to the extension unit; The fourth circuit is used for processing the received fourth signal to obtain a processed fourth signal, and sending the processed fourth signal to the extension unit.

8. The system according to any one of claims 1 to 7, characterized in that: The extension unit is used to send a power supply signal and a radio frequency signal to the first coupling unit; The first coupling unit is used to send a power supply signal and a radio frequency signal to the remote cascade chain; The second coupling unit is used to send a power supply signal and a radio frequency signal to a remote unit connected to the second coupling unit and other second coupling units connected to the second coupling unit, respectively.

9. The system according to claim 8, characterized in that At least one second coupling unit in each of the remote cascade chains is cascade-connected via a radio frequency cable, and each of the second coupling units is respectively connected to one of the remote units via a radio frequency cable; The first coupling unit is respectively connected to the first-stage second coupling unit in each of the remote cascade chains through a radio frequency cable.

10. The system according to claim 8, characterized in that At least one second coupling unit in each of the remote cascade chains is connected in cascade via a feeder line, and each of the second coupling units is connected to one of the remote units via a feeder line; the first coupling unit is connected to the first-stage second coupling unit in each of the remote cascade chains via a feeder line.

11. A signal transmission method, characterized in that: Applied to an indoor distribution system, the indoor distribution system comprises: an access unit, an extension unit, a first coupling unit and at least one remote cascade chain; wherein each remote cascade chain comprises: at least two second coupling units and at least two remote units; the remote unit comprises a signal processing module; at least two second coupling units in each remote cascade chain are cascade-connected, and each remote unit is respectively connected to its corresponding second coupling unit; the method comprises: The first coupling unit sends the radio frequency signal transmitted by the extension unit to the second coupling unit; The second coupling unit sends a radio frequency signal of input power to the remote unit connected to the second coupling unit according to the coupling degree; wherein the coupling degree of the second coupling units included in each of the remote cascade chains is the same; The remote unit adjusts the power of the radio frequency signal from the input power to the target power output through the signal processing module according to the input power and the target power; wherein the target power corresponding to the remote units included in each of the remote cascade chains is the same.

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