Indoor wireless signal coverage system and method

Abstract

The application provides an indoor wireless signal coverage system and method, and relates to the technical field of communication, wherein the system comprises: at least one baseband processing unit (BBU), a plurality of radio remote units (RRUs) and a plurality of leakage cables; wherein the BBU is arranged in a building machine room, each BBU corresponds to a plurality of RRUs, a building indoor space is divided into a plurality of coverage areas according to a preset area, one RRU and a plurality of leakage cables are arranged in each coverage area, and the plurality of leakage cables are buried below the floor of the corresponding coverage area; each BBU is electrically connected with the corresponding plurality of RRUs, and each RRU is electrically connected with the plurality of leakage cables in the corresponding coverage area. The technical scheme provided by the application can realize full coverage of mobile communication signals for an indoor scene with a large space and a high population density, reduce inter-cell interference, improve network quality, and also improve system capacity according to requirements.

Description

Technical Field

[0001] This invention relates to the field of communication technology, and in particular to an indoor wireless signal coverage system and a method for indoor wireless signal coverage. Background Technology

[0002] With the rapid development of 4G (4th generation mobile communication technology) / 5G (5th generation mobile communication technology) services and the repeated implementation of policies to increase speed and reduce costs, mobile network data services have now experienced explosive growth.

[0003] In indoor building scenarios, operators typically build indoor distribution systems to meet users' needs for voice and data services. For large-space applications, such as stadiums, the coverage scheme for indoor distribution systems is as follows: Figure 1 As shown, the indoor distribution system uses a panel antenna, and the radiation pattern of a single panel antenna is as follows. Figure 2 As shown, because the panel antenna needs to be mounted on the ceiling walkway, and the walkway is generally located at the edge of the ceiling, resulting in a relatively high installation position, the panel antenna needs to be mounted at a height of about 20 meters. According to the wireless ray model, the radiation overlap between the various panel antennas is as follows: Figure 3 As shown, when the radiation from each panel antenna reaches the ground or the height of a handheld terminal, the radiation overlaps significantly. This can lead to network interference caused by a large number of concurrent users in large spaces such as stadiums, affecting network quality. Summary of the Invention

[0004] This invention was developed to at least partially address the technical problem in existing technologies where a large number of concurrent users in large-scale application scenarios cause network interference and affect network quality.

[0005] According to one aspect of the present invention, an indoor wireless signal coverage system is provided, the system comprising: at least one baseband processing unit (BBU), multiple radio frequency remote units (RRUs), and multiple leaky cables; wherein, the BBU is arranged in a building equipment room, each BBU corresponds to multiple RRUs, the indoor space of the building is divided into multiple coverage areas according to a preset area, each coverage area is provided with one RRU and multiple leaky cables, and the multiple leaky cables are buried under the floor of the corresponding coverage area; each BBU is electrically connected to the corresponding multiple RRUs, and each RRU is electrically connected to the multiple leaky cables in the corresponding coverage area.

[0006] Optionally, multiple leaky cables within the same coverage area are buried parallel to each other and at equal intervals at a predetermined depth below the floor of the corresponding coverage area.

[0007] Optionally, the spacing between two adjacent leaky cables is 8m to 10m; the burial depth of each leaky cable is 3cm to 5cm.

[0008] Optionally, the radiation angle of each leaky cable is 130° to 150°.

[0009] Optionally, a non-metallic material layer is laid above each leaky cable at floor level.

[0010] Optionally, the RRUs located within each coverage area are wall-mounted within that coverage area.

[0011] Optionally, each RRU is provided with 4 or 8 radio frequency ports; each radio frequency port has transmit and receive functions, each radio frequency port is connected to a leaky cable, and each leaky cable includes at least one leaky cable.

[0012] Optionally, a load is installed at the end of each leaky cable.

[0013] Optionally, each RRU is connected to the beginning of each leaky cable in the corresponding coverage area using a 1 / 2" feeder; and the beginning and end of each leaky cable in each leaky cable are connected using a 1 / 2" feeder.

[0014] According to another aspect of the present invention, an indoor wireless signal coverage method is provided, the method comprising:

[0015] At least one baseband processing unit (BBU) shall be installed in the building's computer room.

[0016] The building’s interior space is divided into multiple coverage areas according to a preset area. In each coverage area, a radio frequency remote unit (RRU) and multiple leaky cables are arranged, and the multiple leaky cables are buried under the floor of the corresponding coverage area.

[0017] Each BBU corresponds to multiple RRUs, each BBU is electrically connected to its corresponding multiple RRUs, and each RRU is electrically connected to multiple leaky cables within its corresponding coverage area.

[0018] The technical solution provided by this invention may include the following beneficial effects:

[0019] The indoor wireless signal coverage system and method provided by this invention divides the indoor space of a building into multiple coverage areas and buries multiple leaky cables under the floor in each coverage area. This enables full coverage of mobile communication signals in large indoor spaces with high population density, while reducing inter-cell interference, improving network quality, and increasing system capacity as needed.

[0020] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the description, claims, and drawings. Attached Figure Description

[0021] The accompanying drawings are provided to further understand the technical solutions of the present invention and constitute a part of the specification. They are used together with the embodiments of the present invention to explain the technical solutions of the present invention, and do not constitute a limitation on the technical solutions of the present invention.

[0022] Figure 1 This is a schematic diagram of the coverage scheme for an indoor distribution system in the prior art;

[0023] Figure 2 This is a radiation elevation view of a single plate antenna in an existing indoor distribution system.

[0024] Figure 3 This is a schematic diagram of the radiation overlap between various plate antennas in an indoor distribution system in the prior art.

[0025] Figure 4 This is a structural block diagram of an indoor wireless signal coverage system provided in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the underground laying of a leaky cable provided in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of network device connections provided in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the overall network topology provided in an embodiment of the present invention;

[0029] Figure 8 This is a flowchart illustrating the indoor wireless signal coverage method provided in an embodiment of the present invention.

[0030] In the diagram: 100 – BBU; 200 – RRU; 300 – Leaky cable; 301 – Leaky cable connector; 400 – 1 / 2" feeder; 500 – Load; 601 – Floor; 602 – Non-metallic material layer. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the specific implementation methods of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific implementation methods described herein are for illustration and explanation only and are not intended to limit the present invention.

[0032] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence; furthermore, in the absence of conflict, the embodiments and features in the embodiments of this invention can be arbitrarily combined with each other. In the following description, the use of suffixes such as "module," "part," or "unit" to denote elements is solely for the convenience of describing this invention and has no specific meaning in itself. Therefore, "module," "part," or "unit" can be used interchangeably.

[0033] Existing indoor distributed antenna system (DAS) deployment schemes for large spaces primarily utilize RRUs (Remote Radio Units) or pRRUs (Pico Remote Radio Units) plus antennas. For large-space applications such as stadiums, the high ceilings necessitate high antenna installation positions (up to approximately 20 meters), resulting in wide antenna beamwidths, severe cell overlap, and significantly impacting network quality, leading to low cell throughput. Furthermore, severe inter-cell interference prevents further capacity expansion, severely restricting traffic release and resulting in low perceived speeds and numerous user complaints. To address these shortcomings in existing indoor DAS deployment methods, which hinder better network quality and user experience, and to resolve network interference and speed degradation issues caused by extremely high traffic volumes and numerous concurrent users in large-space applications, this invention provides an innovative indoor DAS antenna deployment method, which is described in detail below through specific embodiments.

[0034] Figure 4 This is a structural block diagram of an indoor wireless signal coverage system provided in an embodiment of the present invention. Figure 4 As shown, the indoor wireless signal coverage system is suitable for applications in large spaces and high-ceilinged environments (e.g., ceiling height exceeding 20 meters). It includes at least one BBU (Building Baseband Unit) 100, multiple RRUs (Remote Radio Units) 200, and multiple leaky cables 300. Each BBU 100 corresponds to multiple RRUs 200, and each RRU 200 corresponds to multiple leaky cables 300. Figure 4 In this context, k, n, and m are all integers greater than or equal to 1. It should be noted that, to make the device networking clear and concise, Figure 4Only one BBU is shown. In practical applications, if multiple BBUs are required, the networking method of each BBU will be different. Figure 4 same.

[0035] The BBU100 is located in the building's equipment room. The building's interior space is divided into multiple coverage areas according to a preset area. The size of each coverage area is related to the RRU and can be set and adjusted by those skilled in the art according to actual needs. Each coverage area contains one RRU200 and multiple leaky cables 300, with the multiple leaky cables 300 buried under the floor of the corresponding coverage area. Each BBU100 is electrically connected to the corresponding multiple RRU200s, and each RRU200 is electrically connected to the multiple leaky cables 300 within its corresponding coverage area.

[0036] Leaky coaxial cable (LCX) is also commonly known as a leaky cable, leaky coaxial cable, or leaky cable. A leaky cable is a partially shielded coaxial cable that allows electromagnetic waves to propagate longitudinally within its guiding structure. Simultaneously, it can achieve bidirectional propagation of radio frequency energy with its surrounding space, based on the principles of weak magnetic coupling or slot antennas.

[0037] Structurally, a leaky cable consists of an inner conductor, an insulating medium, an outer conductor, and a cable sheath. The inner conductor transmits signals; the insulating medium, located between the inner and outer conductors, provides insulation; the outer conductor has periodic slots that allow electromagnetic waves to radiate outwards, while external electromagnetic fields can also be induced into the cable and transmitted to the receiving end; the cable sheath protects the entire leaky cable from external damage. These structural features allow the leaky cable to leak some electromagnetic energy into the space along its path while transmitting signals, creating a more uniform field attenuation that facilitates reception by the receiving equipment. Furthermore, the slot design and dimensions of the leaky cable are strictly optimized according to the applied frequency range to ensure superior frequency characteristics within the relevant frequency band.

[0038] In this embodiment, the BBU and each RRU can be connected via optical fiber or cable. The BBU is responsible for digital signal processing and scheduling, while the RRU is responsible for radio frequency signal amplification and transmission. The RRU is connected to each leaky cable via feeder cable (i.e., signal feeder cable). The leaky cable serves as a signal transmission, radiation, and receiving antenna, possessing the dual functions of a transmission line and antenna, and offering advantages such as wide frequency band support, uniform radiation, high stability, reliability, and environmental friendliness. The BBU, RRU, and leaky cable work together to form a complete wireless communication system. By changing the shape and installation location of the indoor distributed antenna—that is, replacing the plate antenna with a leaky cable and changing the installation location from an elevated walkway to below the floor—full mobile communication signal coverage can be achieved in large-space, high-density indoor environments. Simultaneously, inter-cell interference is reduced, network quality is improved, and system capacity can be increased as needed.

[0039] In one specific implementation, such as Figures 5 to 7 As shown, multiple leaky cables 300 within the same coverage area are buried parallel to each other and at equal intervals at a predetermined depth below the floor 601 of the corresponding coverage area.

[0040] In this embodiment, multiple leaky cables are buried parallel and at equal intervals under the floor of each coverage area, such as... Figure 5 As shown, by changing the relative position of the user's handheld terminal (h is generally around 1m to 1.6m) and the wireless signal transmitter (leaky cable), a uniform distribution of wireless signals in space can be achieved, avoiding excessive and cluttered signals at the user's handheld terminal that could cause interference.

[0041] In one specific embodiment, the spacing between two adjacent leaky cables 300 is 8m to 10m. The length of a single leaky cable 300 exceeds 550m.

[0042] In this embodiment, by laying multiple leaky cables evenly at intervals under the floor of each coverage area, with each leaky cable covering a channel, that is, each leaky cable covering a channel is counted as a capacity unit, the entire hall floor is divided into multiple capacity units similar to swimming lanes, with a spacing of 8m to 10m between adjacent swimming lanes.

[0043] The primary cell (i.e. the cell with the best signal quality) received by the user handheld terminal at each channel location is the wireless signal emitted by the leaky cable covering this channel, which greatly reduces the overall interference at the user handheld terminal.

[0044] In one specific implementation, the burial depth of each leaky cable 300 (i.e., the distance between the bottom of the leaky cable and the upper surface of the floor) is 3cm to 5cm.

[0045] In this embodiment, the leaky cable is buried 3cm to 5cm below the floor. This effectively protects the leaky cable from damage and avoids the influence of the external environment, while also providing good signal coverage and avoiding coverage blind spots. Furthermore, the leaky cable requires conduit protection; specifically, it is placed inside a PVC pipe and then buried under the floor.

[0046] In one specific implementation, such as Figure 5 As shown, the radiation angle α of each leaky cable 300 is 130° to 150°. Preferably, the radiation angle α of each leaky cable 300 is 140°.

[0047] In this embodiment, the radiation angle setting of each leaky cable can ensure that the radiation width of each leaky cable reaches more than 10 meters, thereby ensuring that there is no coverage blind spot between adjacent leaky cables.

[0048] In one specific implementation, such as Figure 5 As shown, a non-metallic material layer 602 is laid above each leaky cable 300 at a position flush with the floor 601.

[0049] In this embodiment, the non-metallic material layer can be tempered glass, ceramic tile, cement encapsulation, floor adhesive, or other materials.

[0050] In one specific implementation, such as Figure 6 As shown, each RRU200 is wall-mounted within its coverage area.

[0051] In this embodiment, the main RRU can be installed against a wall within the coverage area, concealed through an aesthetically pleasing casing. Ideally, it should be installed in a location inaccessible to non-professionals to avoid electric shock. Compared to the traditional method of installing the main RRU high up in the venue, this embodiment avoids the risks of working at heights, reduces installation difficulty, lowers construction costs, and facilitates maintenance and management.

[0052] In one specific implementation, each RRU200 is provided with 4 or 8 radio frequency ports. Each radio frequency port has transceiver functionality, and each radio frequency port is connected to a leaky cable, with each leaky cable including at least one leaky cable 30.

[0053] Compared to existing indoor distribution systems, this invention also changes the usage type of the main equipment RRU.

[0054] Specifically, currently, indoor distribution system main equipment RRUs typically use a 2TR method (2TR equipment) to connect to a panel antenna. The 2TR equipment has two RF ports, and the panel antenna has two feeder ports, which are directly connected. Due to the limited number of channels in the 2TR equipment, the capacity of a single main equipment is small, resulting in a large number of main equipment required to complete indoor coverage.

[0055] In this embodiment, the main device RRU can be connected to the leaky cable using a 4TR method (4TR device), or the main device RRU can be connected to the leaky cable using an 8TR method (8TR device).

[0056] The 4TR device has four RF ports, each with transmit and receive capabilities. Each RF port can be connected to one leaky cable, reducing the amount of main equipment required and lowering operating costs. The 8TR device has eight RF ports, each with transmit and receive capabilities. Each RF port can be connected to one leaky cable, further reducing the amount of main equipment required and lowering operating costs.

[0057] In one specific implementation, such as Figure 6 and Figure 7 As shown, each leaky cable has a 500 load installed at its end.

[0058] In this embodiment, by connecting a load to the end of each leaky cable, the flow of excess current at the cable end can be terminated, thereby achieving impedance matching of the entire system.

[0059] In one specific implementation, such as Figure 6 and Figure 7 As shown, each RRU200 is connected to the beginning of each leaky cable in the corresponding coverage area using a 1 / 2" (inch) feeder 400.

[0060] In this embodiment, each RF port of the RRU is connected to one end of a 1 / 2" feeder, and the other end of the 1 / 2" feeder is connected to the beginning of a leaky cable through a leaky cable connector 301.

[0061] In one embodiment, the leaky cables 300 in each leaky cable are connected end to end by a 1 / 2" (inch) feeder 400.

[0062] In this embodiment, if each leaky cable includes two or more leaky cables, for ease of wiring, the leaky cables in each leaky cable are interleaved. For example, the RRU is connected to two leaky cables, namely the first leaky cable and the second leaky cable. Each leaky cable includes two leaky cables: the first leaky cable includes the first and second leaky cables, and the second leaky cable includes the third and fourth leaky cables. The first, third, second, and fourth leaky cables are arranged sequentially, parallel and at equal intervals. The ends of each leaky cable are connected using a 1 / 2" feeder. That is, the first end of the first leaky cable is connected to the RRU, the last end of the first leaky cable is connected to the first end of the second leaky cable, and the last end of the second leaky cable is connected to the load; the first end of the third leaky cable is connected to the RRU, the last end of the third leaky cable is connected to the first end of the fourth leaky cable, and the last end of the fourth leaky cable is connected to the load.

[0063] The indoor wireless signal coverage system provided in this invention has an overall architecture of BBU+RRU+leaked cable. The BBU can be installed in the building's equipment room; the RRU can be wall-mounted within the building space, powered by AC, and can be aesthetically pleasing by covering it with a perforated cover to integrate with the building's layout; the leaky cable is buried under the floor. Utilizing the leaky cable's dual function as both a signal transmission and antenna, and by controlling the openings in the leaky cable's outer conductor, controlled electromagnetic wave energy can be evenly radiated and received along the cable. By changing the shape, deployment location, and method of the indoor distributed antenna, full indoor wireless signal coverage can be achieved in large spaces and high-density population scenarios, avoiding coverage blind spots, reducing inter-cell interference, increasing system capacity, and ensuring smooth mobile communication.

[0064] Based on the same technical concept, embodiments of the present invention also provide an indoor wireless signal coverage method. For example... Figure 8 As shown, the method includes the following steps S801 and S802.

[0065] S801. At least one BBU shall be installed in the building's computer room.

[0066] S802. Divide the building’s interior space into multiple coverage areas according to a preset area, and install an RRU and multiple leaky cables in each coverage area, and bury the multiple leaky cables under the floor of the corresponding coverage area.

[0067] Each BBU corresponds to multiple RRUs, each BBU is electrically connected to its corresponding multiple RRUs, and each RRU is electrically connected to multiple leaky cables within its corresponding coverage area.

[0068] In step S802, multiple leaky cables within the same coverage area are buried parallel and at equal intervals at a predetermined depth below the floor of the corresponding coverage area. The spacing between adjacent leaky cables is 8m to 10m; the burial depth of each leaky cable is 3cm to 5cm; the radiation angle of each leaky cable is 130° to 150°; and a non-metallic material layer is laid above each leaky cable at the floor level.

[0069] In step S802, the RRUs located within each coverage area are wall-mounted within that coverage area. Each RRU has 4 or 8 RF ports; each RF port has transmit and receive functions, and each RF port is connected to a leaky cable, with each leaky cable consisting of at least one leaky cable. Each RRU is connected to the beginning of each leaky cable within its corresponding coverage area using a 1 / 2" feeder; the beginnings and ends of each leaky cable within each leaky cable are also connected using a 1 / 2" feeder. A load is installed at the end of each leaky cable.

[0070] The indoor wireless signal coverage method provided in this invention lays a leaky cable with a radiation direction under the floor. Utilizing the characteristics of the leaky cable, which serves as both a signal transmission device and an antenna, and by controlling the opening form of the outer conductor of the leaky cable, controlled electromagnetic wave energy can be uniformly radiated and received along the line. By changing the shape, deployment location, and method of the indoor distributed antenna, full indoor wireless signal coverage can be achieved in large spaces and high-density population scenarios, avoiding coverage blind spots, reducing inter-cell interference, increasing system capacity, and achieving smooth mobile communication.

[0071] In summary, the indoor wireless signal coverage system and method provided by the embodiments of the present invention achieve full indoor wireless signal coverage and uniform distribution of wireless cells in large-space application scenarios such as stadiums by changing the installation method of indoor distributed antennas and the type of main equipment used, thereby reducing interference between cells, improving system capacity and user perception rate.

[0072] Those skilled in the art will understand that all or some of the steps, systems, and apparatuses disclosed above, and their functional modules / units, can be implemented as software, firmware, hardware, or suitable combinations thereof. In hardware implementations, the division between functional modules / units mentioned above does not necessarily correspond to the division of physical components; for example, a physical component may have multiple functions, or a function or step may be performed collaboratively by several physical components. Some or all physical components may be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as integrated circuits, such as application-specific integrated circuits (ASICs). Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An indoor wireless signal coverage system, characterized in that, include: The system includes at least one baseband processing unit (BBU), multiple radio frequency remote units (RRUs), and multiple leaky cables. The BBUs are located in a building's equipment room, with each BBU corresponding to multiple RRUs. The building's interior space is divided into multiple coverage areas according to a preset area. Each coverage area contains one RRU and multiple leaky cables, which are buried under the floor of the corresponding coverage area. Each BBU is electrically connected to its corresponding multiple RRUs, and each RRU is electrically connected to the multiple leaky cables within its corresponding coverage area. Each RRU has 4 or 8 radio frequency ports; each radio frequency port has transceiver function, and each radio frequency port is connected to one leaky cable. Each leaky cable includes at least one leaky cable, and the leaky cables in each leaky cable are interleaved. The ends of each leaky cable in each leaky cable are connected by a 1 / 2" feeder. When the RRU is connected to two leaky cables, namely the first leaky cable and the second leaky cable, each leaky cable includes two leaky cables. The first leaky cable includes the first leaky cable and the second leaky cable, and the second leaky cable includes the third leaky cable and the fourth leaky cable. The first leaky cable, the third leaky cable, the second leaky cable, and the fourth leaky cable are arranged in sequence. The first end of the first leaky cable is connected to the RRU, the last end of the first leaky cable is connected to the first end of the second leaky cable, the first end of the third leaky cable is connected to the RRU, and the last end of the third leaky cable is connected to the first end of the fourth leaky cable. The leaky cable includes an inner conductor, an insulating medium, an outer conductor, and a cable sheath. The inner conductor is used to transmit signals. The insulating medium is located between the inner conductor and the outer conductor and serves as insulation. The outer conductor has periodic slots, which allow electromagnetic waves to radiate outward through the slots. At the same time, external electromagnetic fields can also be induced into the cable through the slots and transmitted to the receiving end. The cable sheath is the outer layer that protects the entire leaky cable and prevents external factors from damaging the cable.

2. The indoor wireless signal coverage system according to claim 1, characterized in that, Multiple leaky cables within the same coverage area are buried parallel to each other and at equal intervals at a predetermined depth below the floor of the corresponding coverage area.

3. The indoor wireless signal coverage system according to claim 2, characterized in that, The spacing between two adjacent leaky cables is 8m to 10m; the burial depth of each leaky cable is 3cm to 5cm.

4. The indoor wireless signal coverage system according to claim 2 or 3, characterized in that, The radiation angle of each leaky cable is 130°~150°.

5. The indoor wireless signal coverage system according to claim 2 or 3, characterized in that, A layer of non-metallic material is laid above each leaky cable at floor level.

6. The indoor wireless signal coverage system according to claim 1, characterized in that, Each RRU deployed within a coverage area is wall-mounted within that coverage area.

7. The indoor wireless signal coverage system according to claim 1, characterized in that, Each leaky cable has a load installed at its end.

8. The indoor wireless signal coverage system according to claim 1, characterized in that, Each RRU is connected to the beginning of each leaky cable in its corresponding coverage area using a 1 / 2" feeder.

9. A method for indoor wireless signal coverage, characterized in that, include: At least one baseband processing unit (BBU) shall be installed in the building's computer room. The building’s interior space is divided into multiple coverage areas according to a preset area. In each coverage area, a radio frequency remote unit (RRU) and multiple leaky cables are arranged, and the multiple leaky cables are buried under the floor of the corresponding coverage area. Each BBU corresponds to multiple RRUs, each BBU is electrically connected to its corresponding multiple RRUs, and each RRU is electrically connected to multiple leaky cables within its corresponding coverage area. Each RRU is equipped with 4 or 8 radio frequency ports. Each radio frequency port has transceiver functionality, and each radio frequency port is connected to one leaky cable. Each leaky cable includes at least one leaky cable, and the leaky cables in each leaky cable are interwoven. The ends of each leaky cable in each leaky cable are connected by a 1 / 2" feeder. When an RRU is connected to two leaky cables, namely the first leaky cable and the second leaky cable, each leaky cable includes two leaky cables. The first leaky cable includes the first leaky cable and the second leaky cable, and the second leaky cable includes the third leaky cable and the fourth leaky cable. The first leaky cable, the third leaky cable, the second leaky cable, and the fourth leaky cable are arranged in sequence, with the first end of the first leaky cable connected to the RRU, the last end of the first leaky cable connected to the first end of the second leaky cable, the first end of the third leaky cable connected to the RRU, and the last end of the third leaky cable connected to the first end of the fourth leaky cable. The leaky cable includes an inner conductor, an insulating medium, an outer conductor, and a cable sheath; the inner conductor is used to transmit signals; the insulating medium is located between the inner conductor and the outer conductor and plays an insulating role; the outer conductor has periodic slots, which allow electromagnetic waves to radiate outward through the slots, and at the same time, external electromagnetic fields can also be induced into the inside of the cable through the slots and transmitted to the receiving end. The cable sheath is the outer layer that protects the entire leaky cable, preventing external factors from damaging the cable.

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