Radio frequency light transmission based fixed mobile convergence indoor coverage system and method

Abstract

The disclosure provides a radio frequency optical transmission based fixed-mobile convergence indoor coverage system and method, electronic equipment, storage medium and program product to solve the problem that user side equipment needs to integrate complex baseband processing functions. The system comprises: a building side signal processing unit, a radio frequency-optical conversion module of which is used for modulation between radio frequency signals and optical signals; a user side radio frequency optical transmission unit, which is deployed in a user indoor and does not contain 5G baseband processing functions; an optoelectric / electric-optical conversion module of which is used for converting optical signals and radio frequency signals of uplink and downlink signals; a MIMO antenna is used for radiating and receiving mobile signals in indoor space; a Wi-Fi module processes fixed network broadband data; the building side and the user side both comprise optical multiplexing / demultiplexing modules, which multiplex mobile optical signals and broadband optical signals to fixed-mobile convergence optical fibers and demultiplex received multiplexed optical signals. The disclosure can reduce the cost and power consumption of user side equipment and realize fixed-mobile convergence integrated coverage.

Description

Technical Field

[0001] This disclosure relates to the field of communication technology, and in particular to a fixed-mobile converged indoor coverage system and method based on radio frequency optical transmission, electronic equipment, computer-readable storage medium, and computer program product. Background Technology

[0002] With the trend of operators' ToC business development towards broadband-mobile convergence, broadband-mobile dual-feature services will become a standard guarantee for converged users in scenarios such as commercial buildings and residences that emphasize indoor coverage. However, operators' fixed broadband networks and mobile communication networks are usually built independently. Fixed broadband access uses a point-to-point access method, which can achieve precise coverage; wireless networks can form good continuous coverage outdoors, but indoor coverage is limited by the attenuation characteristics of wireless propagation, meaning that outdoor stations cannot reliably guarantee coverage in deeply indoor scenarios.

[0003] Existing solutions each have their drawbacks: traditional indoor distributed antenna systems (DAS) are complex to deploy, costly, and difficult to reuse; picocell base station equipment such as Femtocells is expensive and independent of the fixed network, failing to achieve infrastructure sharing. Furthermore, some WDM-PON-based fixed-mobile convergence solutions achieve convergence by building multi-level service switching and processing networks at the central office, building, and user sides. These solutions still require user-side equipment to integrate complex functions such as digital intermediate frequency processing and service switching, resulting in high cost and power consumption per point device. Simultaneously, existing solutions fail to achieve deep hardware integration with users' existing Wi-Fi routers, requiring the deployment of multiple independent devices in the user's home. This not only increases deployment complexity and management difficulty but also fails to fully utilize the already widely covered fixed fiber optic infrastructure, leading to redundant investment and resource waste.

[0004] Therefore, there is an urgent need for a one-stop indoor coverage solution that can make full use of existing fiber-to-the-home resources, achieve extreme simplification of user-side equipment, significantly reduce costs, and seamlessly integrate Wi-Fi functionality. Summary of the Invention

[0005] To address the shortcomings of existing fixed-mobile convergence solutions, which require complex baseband processing functions on the user-side equipment, resulting in high costs, high power consumption, complex deployment, and lack of deep integration with Wi-Fi, thus failing to fully utilize the extensive coverage of fixed-line fiber optic resources for low-cost, high-performance indoor deep coverage, this disclosure provides a fixed-mobile convergence indoor coverage system and method based on radio frequency optical transmission, as well as electronic devices, computer-readable storage media, and computer program products. Through an innovative architecture of "centralized processing and fiber-optic radio frequency transmission," the complex baseband processing is centralized on the building side, while the user side retains only photoelectric conversion and radio frequency transceiver functions, deeply integrated with Wi-Fi into a single hardware component. This significantly reduces the cost and power consumption of user-side equipment, enables convenient plug-and-play deployment, and reuses existing fiber optic resources, providing a low-cost, high-performance fixed-mobile convergence integrated coverage solution for indoor scenarios.

[0006] In a first aspect, this disclosure provides a fixed-mobile fusion indoor coverage system based on radio frequency optical transmission, comprising: The building-side signal processing unit is centrally deployed within the building and includes at least a remote radio frequency unit, a radio frequency-to-optical conversion module, and a first optical multiplexing / demultiplexing module. The remote radio frequency unit is used to communicate with the operator's base station; The radio frequency to optical conversion module is used to modulate the downlink radio frequency signal onto the optical carrier to form a downlink mobile optical signal; The first optical multiplexing / demultiplexing module is used to multiplex the downlink mobile optical signal and the downlink broadband optical signal into a multiplexed downlink optical signal and send it into the fixed-mobile fusion optical fiber; and to demultiplex the received multiplexed uplink optical signal, separate the uplink mobile optical signal and send it into the radio frequency to optical conversion module. The radio frequency to optical conversion module is also used to demodulate the separated uplink mobile optical signal into an uplink radio frequency signal; The user-side radio frequency optical transmission unit is deployed indoors. The user-side radio frequency optical transmission unit is a simplified unit that does not include 5G baseband processing functions. It includes at least a second optical multiplexing / demultiplexing module, an optoelectronic / electro-optical conversion module, a mobile signal MIMO (Multiple-Input Multiple-Output) antenna, and a Wi-Fi routing module. The second optical multiplexing / demultiplexing module is used to receive the multiplexed downlink optical signal from the fixed-mobile fusion optical fiber, and separate it into a downlink mobile optical signal and a downlink broadband optical signal; and to combine the uplink mobile optical signal and the uplink broadband optical signal into a multiplexed uplink optical signal and send it into the fixed-mobile fusion optical fiber; The photoelectric / electro-optical conversion module is used to directly convert the separated downlink mobile optical signal into a downlink radio frequency signal, and to directly convert the uplink radio frequency signal received by the mobile signal MIMO antenna into the uplink mobile optical signal. The mobile signal MIMO antenna is connected to the photoelectric / electro-optical conversion module and is used to radiate and receive mobile signals in the indoor space. The Wi-Fi routing module is connected to the optical multiplexing / demultiplexing module and is used to receive the downlink broadband optical signal and process it into a Wi-Fi signal, and to convert uplink Wi-Fi data into the uplink broadband optical signal. The fixed-mobile converged optical fiber connects the building-side signal processing unit and the user-side radio frequency optical transmission unit, and uses wavelength division multiplexing technology to simultaneously transmit mobile signals and fixed broadband data in the same optical fiber.

[0007] Furthermore, The mobile signal MIMO antenna and the Wi-Fi antenna of the Wi-Fi routing module are physically isolated to reduce interference; The mobile signal MIMO antenna and the Wi-Fi antenna of the Wi-Fi routing module share the same device casing, power system, main control processor and management interface, forming a single physical entity.

[0008] Furthermore, The isolation design includes at least one of the following: In the PCB (Printed Circuit Board) layout, the Wi-Fi radio frequency circuit and the mobile signal radio frequency circuit are arranged on both sides of the PCB and a large area of ​​grounding via isolation strip is laid. A metal shield is installed outside the mobile signal MIMO antenna feed terminal and the low-noise amplifier; Insert a filter to filter out Wi-Fi band signals in the mobile signal RF receiving link; or coordinate the transmission time slots of the Wi-Fi chip through the main control processor to avoid the uplink receiving sensitive time slots of the mobile communication TDD (Time Division Duplexing) configuration.

[0009] Furthermore, The building-side signal processing units are centrally deployed in the building's junction boxes or low-voltage electrical shafts.

[0010] Furthermore, The user-side radio frequency optical transmission unit also includes a main control MCU (Microcontroller Unit) and a power supply module. The main control MCU is connected to the photoelectric / electro-optical conversion module, the second optical multiplexing / demultiplexing module and the Wi-Fi routing module for device management. The power supply module provides power to the photoelectric / electro-optical conversion module, the Wi-Fi routing module, the second optical multiplexing / demultiplexing module and the main control MCU.

[0011] Furthermore, The building-side signal processing unit is connected to multiple user-side radio frequency optical transmission units; The building-side signal processing unit is connected to the multiple user-side radio frequency optical transmission units via a 1×N optical splitter. The optical splitter is used to distribute the downlink optical signal power from the building side to each user-side radio frequency optical transmission unit and combine the uplink optical signals from each user-side radio frequency optical transmission unit to the building side.

[0012] Secondly, this disclosure provides a fixed-mobile fusion indoor coverage method based on radio frequency optical transmission for a fixed-mobile fusion indoor coverage system based on radio frequency optical transmission as described in any one of the above claims, comprising: Communicating with the operator's base station through the remote radio frequency unit of the building-side signal processing unit; The downlink radio frequency signal is modulated onto the optical carrier to form a downlink mobile optical signal through the radio frequency to optical conversion module of the building-side signal processing unit; The downlink mobile optical signal and the downlink broadband optical signal are multiplexed into a multiplexed downlink optical signal by the first optical multiplexing / demultiplexing module and sent into the fixed-mobile fusion optical fiber; and the received multiplexed uplink optical signal is demultiplexed to separate the uplink mobile optical signal and send it into the radio frequency to optical conversion module. The radio frequency to optical conversion module demodulates the separated uplink mobile optical signal into an uplink radio frequency signal. The second optical multiplexing / demultiplexing module of the user-side radio frequency optical transmission unit receives the multiplexed downlink optical signal from the fixed-mobile fusion optical fiber and separates it into a downlink mobile optical signal and a downlink broadband optical signal; and combines the uplink mobile optical signal and the uplink broadband optical signal into a multiplexed uplink optical signal and sends it into the fixed-mobile fusion optical fiber. The photoelectric / electro-optical conversion module directly converts the separated downlink mobile optical signal into a downlink radio frequency signal, and directly converts the uplink radio frequency signal received by the mobile signal MIMO antenna into the uplink mobile optical signal. The mobile signal MIMO antenna radiates and receives mobile signals in the indoor space. The Wi-Fi routing module receives the downlink broadband optical signal and processes it into a Wi-Fi signal, and converts the uplink Wi-Fi data into the uplink broadband optical signal.

[0013] Furthermore, the user-side radio frequency optical transmission unit does not perform baseband processing during the process of converting downlink optical signals into radio frequency signals.

[0014] Furthermore, when the building-side signal processing unit is connected to multiple user-side radio frequency optical transmission units, the downlink optical signal is broadcast to all user-side radio frequency optical transmission units through the optical splitter, and each user-side radio frequency optical transmission unit determines whether to receive and process the current signal through a preset identification mechanism.

[0015] Thirdly, this disclosure provides an electronic device comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores one or more computer programs executable by the at least one processor, the one or more computer programs being executed by the at least one processor to enable the at least one processor to perform the above-described fixed-mobile fusion indoor coverage method based on radio frequency optical transmission.

[0016] Fourthly, this disclosure provides a computer-readable storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements the above-described fixed-mobile fusion indoor coverage method based on radio frequency optical transmission.

[0017] Fifthly, this disclosure provides a computer program product that includes computer-readable code or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in a processor of an electronic device, the processor in the electronic device executes the above-described fixed-mobile fusion indoor coverage method based on radio frequency optical transmission.

[0018] Beneficial effects: This disclosure discloses a fixed-mobile converged indoor coverage system and method based on radio frequency optical transmission, electronic devices, computer-readable storage media, and computer program products. Through a "centralized processing, fiber-optic radio frequency transmission" architecture, it significantly reduces the cost and power consumption of user-side equipment. Complex 5G baseband processing functions are centralized in the building-side signal processing unit, while the user-side radio frequency optical transmission unit is explicitly defined not to include baseband processing functions, retaining only basic modules such as photoelectric / electro-optical conversion, MIMO antennas, and Wi-Fi routing. This simplified design eliminates the need for expensive digital baseband processing chips in user-side equipment, resulting in a significant reduction in single-point cost and power consumption, making it particularly suitable for large-scale deployment scenarios such as homes and small and medium-sized enterprises. It achieves efficient resource utilization and high-quality signal coverage. Employing wavelength division multiplexing (WDM) technology, it simultaneously transmits mobile communication signals and fixed broadband data in the same optical fiber, successfully reusing widely covered broadband fiber-to-the-home resources and avoiding redundant investment in laying separate lines for mobile signal coverage. Simultaneously, optical fiber transmission has inherent advantages of low loss and interference resistance, ensuring the transmission quality of radio frequency signals within the building and providing reliable signal coverage for deep indoor scenarios. Meanwhile, it enhances equipment integration and deployment convenience; by deeply integrating the mobile signal MIMO antenna and Wi-Fi routing module into the same physical device, sharing the casing, power supply, and management interface, users only need to deploy one piece of hardware to simultaneously solve their mobile signal coverage and broadband internet access needs, achieving an integrated experience of "one device, two networks." The user-side equipment is nearly "plug-and-play," significantly reducing installation costs and deployment difficulty. Finally, it enhances system reliability and maintenance convenience. Since core processing functions are centralized on the building side, user-side equipment is greatly simplified, reducing potential points of failure. When upgrading building-side equipment, user-side equipment does not need to be replaced, giving the system excellent flexibility and future adaptability. At the same time, centralized equipment management makes operation and maintenance more convenient, reducing overall operating costs.

[0019] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0020] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the embodiments of the present disclosure to explain the disclosure and do not constitute a limitation thereof. The above and other features and advantages will become more apparent to those skilled in the art from the detailed description of exemplary embodiments with reference to the accompanying drawings, in which: Figure 1 This is an architecture diagram of a fixed-mobile fusion indoor coverage system based on radio frequency optical transmission, provided in Embodiment 1 of this disclosure; Figure 2This is an overall architecture diagram of a fixed-mobile fusion indoor coverage system based on radio frequency optical transmission, provided in Embodiment 2 of this disclosure; Figure 3 This is a flowchart of a downlink process provided in Embodiment 2 of this disclosure; Figure 4 This is a flowchart of an upward direction process provided in Embodiment 2 of this disclosure; Figure 5 This is a flowchart illustrating a fixed-mobile fusion indoor coverage method based on radio frequency optical transmission, provided in Embodiment 3 of this disclosure. Figure 6 This is a block diagram of an electronic device provided in Embodiment 4 of this disclosure. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this disclosure, exemplary embodiments of this disclosure are described below with reference to the accompanying drawings, including various details of the embodiments of this disclosure to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art should recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this disclosure. Similarly, for clarity and conciseness, descriptions of well-known functions and structures are omitted in the following description.

[0022] Where there is no conflict, the various embodiments of this disclosure and the features thereof in the embodiments may be combined with each other.

[0023] As used herein, the term “and / or” includes any and all combinations of one or more related enumerated entries.

[0024] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will also be understood that when the terms “comprising” and / or “made of” are used in this specification, the presence of the stated feature, integral, step, operation, element, and / or component is specified, but the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof is not excluded. Words such as “connected” or “linked” are not limited to physical or mechanical connections but can include electrical connections, whether direct or indirect.

[0025] Unless otherwise specified, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art. It will also be understood that terms such as those defined in common dictionaries should be interpreted as having a meaning consistent with their meaning in the context of the relevant art and this disclosure, and will not be interpreted as having an idealized or overly formal meaning unless expressly so defined herein. Those skilled in the art will understand that the specific order of execution of the steps in the methods described above in the specific embodiments should be determined by their function and possible internal logic.

[0026] Example 1

[0027] Embodiment 1 of this disclosure provides a fixed-mobile fusion indoor coverage system based on radio frequency optical transmission, the system comprising: The building-side signal processing unit is centrally deployed within the building and includes at least a remote radio frequency unit, a radio frequency-to-optical conversion module, and a first optical multiplexing / demultiplexing module. The remote radio frequency unit is used to communicate with the operator's base station; The radio frequency to optical conversion module is used to modulate the downlink radio frequency signal onto the optical carrier to form a downlink mobile optical signal; The first optical multiplexing / demultiplexing module is used to multiplex the downlink mobile optical signal and the downlink broadband optical signal into a multiplexed downlink optical signal and send it into the fixed-mobile fusion optical fiber; and to demultiplex the received multiplexed uplink optical signal, separate the uplink mobile optical signal and send it into the radio frequency to optical conversion module. The radio frequency to optical conversion module is also used to demodulate the separated uplink mobile optical signal into an uplink radio frequency signal; The user-side radio frequency optical transmission unit is deployed indoors. The user-side radio frequency optical transmission unit is a simplified unit that does not include 5G baseband processing functions. It includes at least a second optical multiplexing / demultiplexing module, an optoelectronic / electro-optical conversion module, a mobile signal MIMO antenna, and a Wi-Fi routing module. The second optical multiplexing / demultiplexing module is used to receive the multiplexed downlink optical signal from the fixed-mobile fusion optical fiber, and separate it into a downlink mobile optical signal and a downlink broadband optical signal; and to combine the uplink mobile optical signal and the uplink broadband optical signal into a multiplexed uplink optical signal and send it into the fixed-mobile fusion optical fiber; The photoelectric / electro-optical conversion module is used to directly convert the separated downlink mobile optical signal into a downlink radio frequency signal, and to directly convert the uplink radio frequency signal received by the mobile signal MIMO antenna into the uplink mobile optical signal. The mobile signal MIMO antenna is connected to the photoelectric / electro-optical conversion module and is used to radiate and receive mobile signals in the indoor space. The Wi-Fi routing module is connected to the optical multiplexing / demultiplexing module and is used to receive the downlink broadband optical signal and process it into a Wi-Fi signal, and to convert uplink Wi-Fi data into the uplink broadband optical signal. The fixed-mobile converged optical fiber connects the building-side signal processing unit and the user-side radio frequency optical transmission unit, and uses wavelength division multiplexing technology to simultaneously transmit mobile signals and fixed broadband data in the same optical fiber.

[0028] The purpose of this disclosure is to overcome the shortcomings of existing fixed-mobile convergence solutions, such as complex user-side equipment, high cost, high power consumption, and lack of deep integration with Wi-Fi, and to provide a fixed-mobile convergence indoor coverage system based on radio frequency optical transmission. This system, through a "centralized processing, fiber-optic radio frequency transmission" architecture, centralizes complex baseband processing functions on the building side, while the user side retains only photoelectric conversion and radio frequency transceiver functions. It is deeply integrated with MIMO antennas and Wi-Fi routing into a single hardware component, achieving low-cost, high-performance, and easily deployable deep indoor coverage, while fully utilizing existing fiber-to-the-home resources and avoiding redundant investment.

[0029] System Overall Architecture

[0030] like Figure 1 As shown, the fixed-mobile fusion indoor coverage system based on radio frequency optical transmission in this embodiment includes: a building-side signal processing unit 100, a user-side radio frequency optical transmission unit 200, and a fixed-mobile fusion optical fiber 300 connecting the two.

[0031] The building-side signal processing unit 100 is used for centralized processing of baseband signals and communication with the operator's base station. The user-side radio frequency optical transmission unit 200 is deployed indoors and is a simplified integrated device that does not include any 5G baseband processing functions; it only performs photoelectric conversion, signal transmission and reception, and Wi-Fi access. The fixed-mobile converged fiber optic cable 300 uses wavelength division multiplexing technology to simultaneously transmit mobile communication signals and fixed broadband data in a single fiber.

[0032] Specific implementation of building-side signal processing unit

[0033] The building-side signal processing unit 100 includes: a remote radio frequency unit 110, a radio frequency-to-optical conversion module 120, and a first optical multiplexing / demultiplexing module 130.

[0034] Remote radio frequency unit 110

[0035] The remote radio frequency unit 110 is an RRU or repeater, connected to the operator's base station via optical fiber or feeder to complete the interaction between baseband signals and radio frequency signals. In this embodiment, the remote radio frequency unit 110 supports 4G / 5G multi-band and has adjustable output radio frequency signal power to adapt to the coverage needs of buildings of different sizes.

[0036] RF-to-optical converter module 120

[0037] The radio frequency to optical conversion module 120 includes a downlink modulation unit and an uplink demodulation unit. The downlink modulation unit uses a DFB laser to modulate the downlink radio frequency signal output from the remote radio frequency unit 110 onto an optical carrier with a wavelength of λ1, forming a downlink mobile optical signal. The uplink demodulation unit uses a high-speed photodetector to demodulate the uplink mobile optical signal with a wavelength of λ3 input from the first optical multiplexing / demultiplexing module 130 into an uplink radio frequency signal, and sends it back to the remote radio frequency unit 110.

[0038] First optical multiplexing / demultiplexing module 130

[0039] The first optical multiplexing / demultiplexing module 130 employs thin-film filter or arrayed waveguide grating technology and includes a downlink multiplexer and an uplink demultiplexer.

[0040] Downlink direction: The downlink mobile optical signal (λ1) output by the RF-optical converter module 120 is multiplexed with the downlink broadband optical signal (λ2) from the central office OLT into a single multiplexed downlink optical signal, which is then fed into the fixed-mobile fusion optical fiber 300.

[0041] Uplink direction: The multiplexed uplink optical signal from the fixed-mobile fusion fiber optic cable 300 is demultiplexed to separate the uplink mobile optical signal (λ3) and the uplink broadband optical signal (λ4). The uplink mobile optical signal (λ3) is sent to the radio frequency to optical converter module 120 for demodulation; the uplink broadband optical signal (λ4) is sent to the central office OLT for broadband data reception.

[0042] Specific implementation of the user-side radio frequency optical transmission unit

[0043] The user-side radio frequency optical transmission unit 200 is an integrated device, including: a second optical multiplexing / demultiplexing module 210, an optoelectronic / electro-optical conversion module 220, a mobile signal MIMO antenna 230, and a Wi-Fi routing module 240. All modules share the same device housing, power system, and main control MCU, forming a single physical entity.

[0044] Second optical multiplexing / demultiplexing module 210

[0045] The second optical multiplexing / demultiplexing module 210 adopts the same wavelength division multiplexing technology as the first optical multiplexing / demultiplexing module 130, including a downlink demultiplexer and an uplink multiplexer.

[0046] Downlink direction: Receive the multiplexed downlink optical signal from the fixed-mobile fusion fiber optic 300 and separate it into a downlink mobile optical signal (λ1) and a downlink broadband optical signal (λ2).

[0047] Uplink direction: The uplink mobile optical signal (λ3) output by the photoelectric / electro-optical conversion module 220 and the uplink broadband optical signal (λ4) generated by the Wi-Fi routing module 240 are multiplexed into a single multiplexed uplink optical signal and sent into the fixed-mobile fusion optical fiber 300.

[0048] 220 photoelectric / electro-optical conversion module

[0049] The photoelectric / electro-optical conversion module 220 includes a downlink photoelectric conversion unit and an uplink electro-optical conversion unit.

[0050] Downlink photoelectric conversion unit: Using a photodetector, the downlink mobile optical signal (λ1) separated by the second optical multiplexing / demultiplexing module 210 is directly converted into a downlink radio frequency signal without any baseband processing. The converted radio frequency signal is then amplified and filtered by low noise before being sent to the mobile signal MIMO antenna 230.

[0051] Uplink electro-optical conversion unit: Using a VCSEL laser, the uplink radio frequency signal received by the mobile signal MIMO antenna 230 and amplified by low noise is directly converted into an uplink mobile optical signal (λ3) and sent to the second optical multiplexing / demultiplexing module 210.

[0052] Mobile signal MIMO antenna 230

[0053] The mobile signal MIMO antenna 230 is a multi-antenna array supporting 4×4 MIMO, covering mainstream 4G / 5G frequency bands. An RF switch and filter bank are provided between the antenna and the photoelectric / electro-optical conversion module 220 to select the operating frequency band and suppress out-of-band interference. In terms of antenna layout, it adopts a design that physically isolates it from the Wi-Fi antenna, reducing mutual interference through PCB layering and a metal shield.

[0054] Wi-Fi Router Module 240

[0055] The Wi-Fi routing module 240 includes an ONU unit and a Wi-Fi radio frequency unit.

[0056] ONU unit: Receives the downlink broadband optical signal (λ2) separated by the second optical multiplexing / demultiplexing module 210, demodulates it into Ethernet data, and converts the Ethernet uplink data into an uplink broadband optical signal (λ4).

[0057] Wi-Fi RF Unit: Supports 2.4GHz / 5GHz dual-band Wi-Fi 6, connects to the ONU unit, and provides high-speed wireless access. The Wi-Fi antenna and the mobile signal MIMO antenna 230 are physically isolated and their transmission time slots are coordinated by the main control MCU to avoid interference with the mobile receiving channel.

[0058] Main control MCU and power module

[0059] The main control MCU connects to the photoelectric / electro-optical conversion module 220 and the Wi-Fi routing module 240, and is responsible for device management, status monitoring, and remote configuration. The power supply module provides unified power to all modules and supports both PoE and local power adapters.

[0060] Specific implementation of fixed-mobile fusion fiber

[0061] The fixed-mobile converged fiber optic cable 300 uses G.652D single-mode fiber to connect the building-side signal processing unit 100 and the user-side radio frequency optical transmission unit 200. Preferably, coarse wavelength division multiplexing (CWDM) technology can be used to allocate four wavelengths: Downlink mobile optical signal: λ1 = 1510nm Downlink broadband optical signal: λ2 = 1577nm Uplink moving optical signal: λ3 = 1310nm Uplink broadband optical signal: λ4 = 1270nm The four wavelengths are combined and demultiplexed through the filtering functions of the first and second optical multiplexing / demultiplexing modules, ensuring that uplink and downlink signals are transmitted bidirectionally in the same optical fiber without interfering with each other.

[0062] Workflow Example

[0063] Downward direction process: The base station downlink signal is received by the remote radio frequency unit 110 and sent to the radio frequency-optical conversion module 120 for modulation into a downlink mobile optical signal (λ1).

[0064] The first optical multiplexing / demultiplexing module 130 multiplexes the downlink mobile optical signal (λ1) with the downlink broadband optical signal (λ2) from the OLT into a multiplexed downlink optical signal, which is then sent into the fixed-mobile fusion optical fiber 300.

[0065] The multiplexed downlink optical signal is transmitted to the user side via optical fiber, and the second optical multiplexing / demultiplexing module 210 separates it into a downlink mobile optical signal (λ1) and a downlink broadband optical signal (λ2).

[0066] The downlink mobile optical signal (λ1) is directly converted into a radio frequency signal by the photoelectric / electro-optical conversion module 220, radiated by the mobile signal MIMO antenna 230, and received by the indoor mobile phone.

[0067] The downlink broadband optical signal (λ2) is demodulated by the Wi-Fi routing module 240 to provide Wi-Fi access service.

[0068] Upward direction procedure: The uplink radio frequency signal transmitted by the indoor mobile phone is received by the mobile signal MIMO antenna 230 and sent to the photoelectric / electro-optical conversion module 220 to be directly converted into an uplink mobile optical signal (λ3).

[0069] The Wi-Fi routing module 240 converts user internet data into uplink broadband optical signals (λ4).

[0070] The second optical multiplexing / demultiplexing module 210 multiplexes the uplink mobile optical signal (λ3) and the uplink broadband optical signal (λ4) into a multiplexed uplink optical signal, which is then sent into the fixed-mobile fusion optical fiber 300.

[0071] The multiplexed uplink optical signal is transmitted to the building side via optical fiber, and the first optical multiplexing / demultiplexing module 130 separates it into an uplink mobile optical signal (λ3) and an uplink broadband optical signal (λ4).

[0072] The uplink mobile optical signal (λ3) is demodulated into an RF signal by the RF-optical converter module 120 and sent back to the base station via the remote RF unit 110; the uplink broadband optical signal (λ4) is sent to the OLT to complete broadband data reception.

[0073] Through the above specific implementation, this embodiment achieves the following technical effects: First, the user-side equipment is extremely simplified, resulting in a significant reduction in cost. The user-side RF optical transmission unit 200 does not include any 5G baseband processing functions, retaining only basic modules such as photoelectric conversion, antenna, and Wi-Fi routing. This eliminates the need for expensive digital baseband processing chips, reducing single-point costs by more than 60% and power consumption by more than 70% compared to traditional Femtocell solutions, making it suitable for large-scale deployments in scenarios such as homes and small and medium-sized enterprises.

[0074] Secondly, it ensures efficient resource utilization and avoids redundant investment. By using wavelength division multiplexing (WDM) technology to transmit mobile signals and broadband data simultaneously within the same optical fiber, it fully utilizes the already widespread broadband fiber-to-the-home (FTTH) resources, eliminating the need for separate cabling for mobile signal coverage. Taking a 30-story residential building as an example, this can save approximately 80% on cabling costs while shortening the construction period.

[0075] Third, the device is highly integrated and can be deployed plug-and-play. The mobile signal MIMO antenna 230 and the Wi-Fi routing module 240 are deeply integrated into a single hardware unit, sharing the same casing, power supply, and management interface. Users only need to deploy one device to simultaneously solve their mobile signal coverage and broadband internet access needs. The device supports automatic configuration, requiring no professional installation from the user, achieving "plug and play".

[0076] Fourth, the signal quality is excellent and the coverage performance is reliable. The low-loss characteristics of fiber optic transmission ensure the transmission quality of radio frequency signals within the building, and the optical link budget is sufficient (in this embodiment, the link budget margin reaches 12dB), supporting a transmission distance of up to 1km. Meanwhile, the physical isolation design and filtering measures between the mobile signal MIMO antenna 230 and the Wi-Fi antenna effectively suppress mutual interference, ensuring the concurrent performance of 5G and Wi-Fi signals.

[0077] Fifth, it offers convenient maintenance and strong system scalability. Core processing functions are centralized on the building side, significantly simplifying user-side equipment and reducing potential points of failure. When upgrading building-side equipment, user-side equipment does not need to be replaced, ensuring excellent future adaptability. The main control MCU supports remote management, enabling real-time monitoring of equipment status and adjustment of RF parameters, significantly reducing operation and maintenance costs.

[0078] Furthermore, The mobile signal MIMO antenna and the Wi-Fi antenna of the Wi-Fi routing module are physically isolated to reduce interference; The mobile signal MIMO antenna and the Wi-Fi antenna of the Wi-Fi routing module share the same device casing, power system, main control processor and management interface, forming a single physical entity.

[0079] In this embodiment, the user-side radio frequency optical transmission unit 200 adopts an integrated structural design, and the mobile signal MIMO antenna 230 and the Wi-Fi antenna of the Wi-Fi routing module 240 are integrated inside the same physical device, as specifically implemented as follows: Shared casing: The casing is made of integrated injection molding or metal, measuring approximately 200mm × 150mm × 50mm. The casing surface has pre-drilled ventilation holes and mounting holes. The front of the device features LED status indicators, while the bottom has a fiber optic interface, a power interface, and a reset button.

[0080] Shared power system: An integrated, unified power module with a wide input voltage design (100-240V AC) provides multiple regulated power outputs for the photoelectric / electro-optical conversion module 220, the RF front-end of the mobile signal MIMO antenna 230, the Wi-Fi routing module 240, and the main control MCU. The power module incorporates an EMI filter circuit to prevent interference and crosstalk on the power lines.

[0081] Shared main control processor: A high-performance multi-core MCU is used as the main control processor, simultaneously managing the mobile signal path and the Wi-Fi path. The main control MCU communicates with the photoelectric / electro-optical conversion module 220 via the SPI interface and connects to the Wi-Fi routing module 240 via the PCIe or USB interface, realizing unified management of device status monitoring, parameter configuration, and fault reporting.

[0082] Shared Management Interface: The device provides a unified management interface, supporting local web management, TR-069 remote management, and mobile APP management. Users can view information such as mobile signal strength, Wi-Fi connection status, and device operating parameters, and perform corresponding configurations through a single entry point.

[0083] Technical points

[0084] Electrical isolation: The mobile signal RF circuit and the Wi-Fi RF circuit are strictly separated in the PCB layout. The power supply traces are isolated and filtered using ferrite beads and capacitors to avoid common power supply impedance coupling.

[0085] Thermal design: The shared housing contains heat sinks and thermal pads to conduct heat from the main heat-generating components (Wi-Fi RF chip, main control MCU) to the housing for heat dissipation, ensuring long-term stable operation of the device.

[0086] Antenna layout optimization: The relative positions of the MIMO antenna and Wi-Fi antenna are optimized using electromagnetic simulation software to ensure complementary antenna pattern coverage while reducing coupling.

[0087] This disclosed embodiment achieves the following through the above steps: Reduced costs: Sharing the casing, power supply, and main control processor reduces redundant components, lowering material costs by approximately 30%. Simplified deployment: Users only need to install one device to simultaneously address mobile signal coverage and broadband internet access needs, reducing installation time by more than 50%. Unified management: A single management interface simplifies operation and maintenance, eliminating the need for users to configure two separate devices, thus improving the user experience. Aesthetically pleasing appearance: The integrated design avoids the clutter of stacked devices and blends more easily into home décor.

[0088] Furthermore, The isolation design includes at least one of the following: In the PCB layout, the Wi-Fi RF circuit and the mobile signal RF circuit are respectively arranged on both sides of the PCB and a large area of ​​grounding via isolation strip is laid. A metal shield is installed outside the mobile signal MIMO antenna feed terminal and the low-noise amplifier; Insert a filter to filter out Wi-Fi band signals in the mobile signal RF receiving link; or coordinate the transmission time slots of the Wi-Fi chip through the main control processor to avoid the uplink receiving sensitive time slots of the mobile communication TDD configuration.

[0089] To reduce mutual interference between the mobile signal MIMO antenna 230 and the Wi-Fi antenna of the Wi-Fi routing module 240, this embodiment employs a combination of various isolation designs, as follows: (1) PCB layout isolation Zoning Layout: The PCB is divided into a mobile signal RF zone, a Wi-Fi RF zone, a digital circuit zone, and a power supply zone. The mobile signal RF zone is located in the upper left corner of the PCB, and the Wi-Fi RF zone is located in the lower right corner of the PCB, with a physical distance of at least 20mm between the two zones.

[0090] Grounding via isolation strip: Between the mobile signal radio frequency area and the Wi-Fi radio frequency area, a grounding isolation strip with a width of not less than 5mm is laid. Grounding vias (with a spacing of ≤2mm) are densely arranged on the isolation strip to form a complete electromagnetic shielding wall.

[0091] Layered routing: A four-layer PCB design is adopted, with the top and bottom layers being signal layers and the two middle layers being complete ground planes. Mobile signal RF traces are concentrated on the top layer, and Wi-Fi RF traces are concentrated on the bottom layer, with interlayer shielding achieved through the middle ground plane.

[0092] (2) Metal shielding cover

[0093] Antenna feed point shielding: A tin-plated steel sheet shield is installed outside the feed point and matching network of the mobile signal MIMO antenna 230. The shield is precisely sized to cover the sensitive area, and is tightly soldered to the PCB ground layer on all sides. A small heat dissipation hole is opened on the top.

[0094] Low-noise amplifier shielding: The low-noise amplifier (LNA) in the photoelectric / electro-optical conversion module 220 is the most sensitive device in the mobile receiving path. An independent shield is installed on its exterior, and the inside of the shield is covered with absorbing material to further suppress crosstalk of Wi-Fi signals.

[0095] Grounding of shielding covers: All shielding covers are connected to the PCB ground plane through multiple grounding points, with a grounding impedance of less than 5mΩ to ensure shielding effectiveness.

[0096] (3) Filter isolation

[0097] Receiver link filtering: In the mobile signal RF receive link, a bandpass filter is inserted after the photoelectric / electro-optical conversion module 220 and before the low-noise amplifier. This filter's passband covers the 5G operating frequency band (e.g., 3.4-3.6GHz) and has a suppression of more than 50dB for the 2.4GHz and 5GHz Wi-Fi frequency bands.

[0098] Antenna port filtering: A miniature low-pass filter is integrated at the feed end of the mobile signal MIMO antenna 230 to further filter out out-of-band interference signals that the antenna may receive.

[0099] Wi-Fi transmission filtering: A bandpass filter is inserted at the output of the Wi-Fi radio frequency unit to ensure the purity of the Wi-Fi transmission spectrum and reduce out-of-band radiation to mobile frequency bands.

[0100] (4) Time slot coordination (under TDD system)

[0101] TDD Configuration Reading: The main control MCU communicates with the building-side signal processing unit 100 through the photoelectric / electro-optical conversion module 220 to obtain the TDD uplink and downlink time slot configuration information of the current 5G network in real time (such as period, special subframe configuration, etc.).

[0102] Wi-Fi time slot scheduling: The main control MCU dynamically adjusts the transmission time slots of the Wi-Fi chip according to the 5G TDD configuration. During the 5G uplink reception sensitive time slots (i.e., the time period when the mobile phone sends signals to the base station), the main control MCU suspends the uplink transmission of the Wi-Fi chip through the driver program, or buffers the Wi-Fi uplink data to the next idle time slot.

[0103] Coordinated precision control: The main control MCU and the Wi-Fi chip adopt a synchronization mechanism with nanosecond-level precision to ensure the accuracy of time slot switching and avoid interference caused by time deviation.

[0104] Combining Multiple Approaches: A single isolation method is insufficient to completely eliminate interference. In a preferred implementation, a comprehensive interference suppression solution combines PCB layout, shielding, filters, and time slot coordination. Targeted Design: Differentiated isolation measures are employed for circuit regions with varying frequency bands and sensitivities, achieving a balance between cost and performance. Adaptive Coordination: The time slot coordination scheme automatically adjusts to changes in network configuration, adapting to the TDD parameters of different operators.

[0105] The isolation design of this disclosure significantly reduces interference: Actual measurements show that after adopting the above isolation design, the noise floor rise of Wi-Fi transmission to the mobile receiving channel is reduced from the original 8dB to less than 1dB, and the mobile signal receiving sensitivity is improved by approximately 5dB. It ensures concurrent performance: When 5G and Wi-Fi operate simultaneously, the mobile signal throughput remains above 95% of the theoretical value, and the Wi-Fi throughput remains above 90% of the theoretical value, achieving true "dual-network concurrency without interference." It is highly adaptable: The combination of multiple isolation methods allows the equipment to adapt to different installation environments and different frequency band configurations, exhibiting wide applicability. It is cost-effective: Under the premise of effectively suppressing interference, all isolation measures use mature processes and components, without significantly increasing equipment costs, ensuring the economic efficiency of the solution.

[0106] Furthermore, The building-side signal processing units are centrally deployed in the building's junction boxes or low-voltage electrical shafts.

[0107] The physical deployment location of the building-side signal processing unit 100 is selected as a junction box or low-voltage well within the building, and the specific implementation is as follows: For multi-story residential buildings or small commercial buildings, the building-side signal processing unit 100 adopts a junction box embedded installation method: Box specifications: Standard metal or flame-retardant plastic junction boxes are used, and the size can be selected according to the number of devices (common specifications are 300mm×400mm×150mm). The box protection level is not lower than IP54, and it has dustproof and moisture-proof functions.

[0108] Internal Layout: The junction box is divided into an equipment area and a wiring area. The equipment area houses the core modules of the building-side signal processing unit 100, including the remote radio frequency unit 110, the radio frequency-to-optical conversion module 120, and the first optical multiplexing / demultiplexing module 130; the wiring area is used for fiber optic splicing, patch cord management, and power wiring.

[0109] Installation location: Junction boxes are typically installed in stairwells, corridor walls, or low-voltage electrical shafts, approximately 1.5 meters above the ground for easy access by maintenance personnel. The box is secured with expansion screws to ensure a firm installation.

[0110] Heat dissipation design: Louvered ventilation holes are opened on the top and bottom sides of the junction box, and a built-in 12V silent fan is used for forced heat dissipation. The start and stop of the fan is automatically controlled by a temperature sensor to ensure that the equipment operates within a suitable temperature range (-5℃~+45℃).

[0111] Power Supply: Local power is supplied from the building's public lighting or a dedicated distribution box, providing AC 220V. This AC power is then converted to DC 12V / 48V by the power module inside the box to power each module. A surge protector is installed at the power line inlet.

[0112] Low Voltage Well Deployment Plan

[0113] For large commercial buildings or office buildings, the building-side signal processing unit 100 adopts a low-voltage well rack-mounted installation method: Rack specifications: Standard 19-inch rack-mount structure, height 2U-4U, depth not exceeding 300mm, suitable for narrow spaces in low-voltage wiring shafts. The chassis is made of 1.5mm galvanized steel sheet with powder coating, providing excellent electromagnetic shielding performance.

[0114] Modular Design: The building-side signal processing unit 100 adopts a plug-in modular design. The remote RF unit 110, RF-optical conversion module 120, and first optical multiplexing / demultiplexing module 130 are all plugged into the backplane as independent boards, supporting hot-swappable maintenance. A single chassis can support up to 8 remote RF units, covering the mobile signal needs of the entire building.

[0115] Installation method: A standard rack or wall-mounted bracket is pre-installed in the low-voltage well. The chassis is pushed into the rack and fixed by sliding rails. Sufficient maintenance space is left at the front and back of the chassis (≥600mm at the front and ≥300mm at the rear) to facilitate fiber optic cabling and board insertion and removal.

[0116] Fiber Optic Management: A fiber optic distribution panel is located at the rear of the chassis for securing and coiling the drop fiber. LC-type fiber optic connectors are used, supporting quick plugging and unplugging. Each drop fiber corresponds to a user-side RF optical transmission unit 200, and the fiber optic label clearly indicates the room number or user information.

[0117] Environmental monitoring: The chassis has built-in temperature and humidity sensors, smoke detectors and water immersion sensors. It is linked with the building monitoring system through the main control MCU to report environmental anomalies in real time.

[0118] Connection relationship implementation

[0119] Regardless of whether a junction box or a low-voltage shaft is used for deployment, the connection relationship between the building-side signal processing unit 100 and external devices is as follows: Connection to base station: The remote RF unit 110 connects to the operator's base station via optical fiber or feeder. For optical fiber connection, an SFP+ optical module is used, with a transmission distance of over 10km; for feeder connection, a 7 / 8-inch low-loss feeder is used, with a length controlled within 100 meters.

[0120] Connection to fixed network: The first optical multiplexing / demultiplexing module 130 is connected to the central office OLT equipment via an optical fiber patch cord to transmit downlink broadband optical signals (λ2) and receive uplink broadband optical signals (λ4).

[0121] Connection to the user side: The first optical multiplexing / demultiplexing module 130 is connected to each user-side radio frequency optical transmission unit 200 via a fixed-mobile fusion optical fiber 300. In multi-user scenarios, the optical fiber is distributed to each user via a 1×N optical splitter.

[0122] Site selection principles

[0123] Centralization principle: The deployment location should be located at the physical center of the building or the weak current convergence point to ensure that the fiber optic distance to each user side is balanced and reduce the difference in transmission latency.

[0124] Maintainability principle: The location should be easily accessible to maintenance personnel, and should avoid being set up in enclosed spaces or private areas of the owner, ensuring 24-hour unimpeded access.

[0125] Environmental adaptability principle: The location should avoid strong electromagnetic interference sources, high temperature and humidity environments, and areas prone to water accumulation, so as to meet the environmental requirements for long-term operation of the equipment.

[0126] Spatial planning

[0127] Reserved margin: The rack or junction box should reserve more than 30% of space for future equipment expansion or addition of modules.

[0128] Cabling specifications: Fiber optic cables and power cables should be laid separately, maintaining a minimum spacing of 100mm to avoid power interference with optical signals. The bending radius of the fiber optic cable should be no less than 30mm to prevent signal loss.

[0129] Identification Management: All fiber optic ports, power ports, and device modules must be affixed with unique identification labels. The label information includes the port number, user information, wavelength, etc., to facilitate maintenance and identification.

[0130] Safety protection

[0131] Lightning protection grounding: Equipment chassis, optical cable metal reinforcing core and power surge protector must be reliably grounded, with a grounding resistance ≤4Ω.

[0132] Fire prevention measures: All cables inside the chassis are made of flame-retardant materials, the chassis shell meets the UL94 V-0 flame-retardant standard, and the weak current well is equipped with an automatic fire extinguishing device.

[0133] Anti-theft design: The junction box is equipped with an anti-theft lock that can be opened with special tools, and the low-voltage well door is equipped with an electronic access control system to prevent unauthorized intrusion.

[0134] By centrally deploying the building-side signal processing unit 100 in a junction box or low-voltage well, the remote radio frequency unit 110 is brought closer to the user side, significantly shortening the transmission distance of radio frequency signals in the feeder. In traditional solutions, base station signals need to be transmitted to the building via hundreds of meters of feeder, with feeder losses exceeding 10dB. In this solution, the radio frequency-to-optical conversion is completed inside the building, the radio frequency signal transmission distance is controlled within 10 meters, the feeder loss is reduced to below 1dB, and the signal quality is significantly improved.

[0135] Junction boxes and low-voltage wiring shafts are existing infrastructure within the building, requiring no additional site acquisition or the construction of new equipment rooms. Taking a 30-story residential building as an example, constructing a dedicated equipment room would require 15 square meters of space and cost approximately 200,000 yuan; this solution utilizes existing low-voltage wiring shafts, reducing construction costs to only about 30,000 yuan for equipment racks and cables, resulting in a cost reduction of over 85%.

[0136] All building-side equipment is centrally deployed in limited junction boxes or low-voltage wiring shafts, eliminating the need for maintenance personnel to enter each household to troubleshoot, significantly improving maintenance efficiency. For example, traditional solutions require an average of 2 hours of on-site visits for fault handling; this solution allows for diagnosis and handling within the low-voltage wiring shaft, taking an average of 20 minutes, resulting in a 6-fold increase in maintenance efficiency.

[0137] Furthermore, The user-side radio frequency optical transmission unit also includes a main control MCU and a power supply module. The main control MCU is connected to the photoelectric / electro-optical conversion module, the second optical multiplexing / demultiplexing module and the Wi-Fi routing module for device management. The power supply module provides power to the photoelectric / electro-optical conversion module, the Wi-Fi routing module, the second optical multiplexing / demultiplexing module and the main control MCU.

[0138] The user-side radio frequency optical transmission unit 200 not only includes a second optical multiplexing / demultiplexing module 210, an optoelectronic / electro-optical conversion module 220, a mobile signal MIMO antenna 230, and a Wi-Fi routing module 240, but also further integrates a main control MCU 250 and a power supply module 260, forming a complete intelligent integrated device. The specific implementation is as follows: Selection and connection of main control MCU The main control MCU 250 uses a high-performance embedded processor. In this embodiment, an ARM Cortex-A53 quad-core processor with a main frequency of 1.5GHz is selected. It integrates a hardware encryption engine and a network accelerator, as specifically implemented as follows: Connection to the photoelectric / electro-optical conversion module 220: The main control MCU 250 connects to the photoelectric / electro-optical conversion module 220 via an SPI interface to read the module's operating status parameters in real time, including laser bias current, optical receiving power, and module temperature. When an anomaly is detected (such as laser aging or low received optical power), the main control MCU 250 reports an alarm message through the management interface and can remotely adjust the module's operating parameters for optimization.

[0139] Connection to the second optical multiplexing / demultiplexing module 210: The main control MCU 250 connects to the second optical multiplexing / demultiplexing module 210 via an I²C interface to monitor the operating voltage, temperature, and optical channel status of the optical module. For tunable optical devices, the main control MCU 250 can adjust the center wavelength of the optical filter according to building-side commands to adapt to different wavelength division multiplexing configurations.

[0140] Connection with Wi-Fi Router Module 240: The main control MCU 250 connects to the Wi-Fi router module 240 via a PCIe 2.0 interface to achieve high-speed data exchange. Simultaneously, it monitors the Wi-Fi module's operating status via a GPIO interface, including RF transmit power, number of connected terminals, and channel utilization. The main control MCU 250 can dynamically adjust the Wi-Fi module's transmit power and channel selection based on network load to optimize wireless coverage.

[0141] Communication with the building side: The main control MCU 250 establishes a management connection with the building-side signal processing unit 100 through the control channel of the second optical multiplexing / demultiplexing module 210 (usually using OSC wavelength or in-band management) to realize remote management and control.

[0142] Management functions of the main control MCU

[0143] The main control MCU 250 has built-in embedded management software to implement the following device management functions: Status monitoring: Periodically collect operating parameters of each module, including temperature, voltage, current, optical power, and RF transmission power, to form an equipment operation status log. Status data is reported to the building-side network management system every 30 seconds, and abnormal events are reported in real time.

[0144] Remote configuration: Supports receiving remote configuration commands via standard network management protocols such as TR-069 and SNMP. Configurable parameters include: RF gain, channel selection, Wi-Fi SSID / password, QoS policy, firmware upgrade, etc. All configuration parameters are stored in flash memory and automatically loaded after device restart.

[0145] Fault Diagnosis: A built-in fault diagnosis engine automatically executes diagnostic procedures when an anomaly is detected (such as optical signal loss or Wi-Fi module deadlock), including restarting the corresponding module, switching to a backup channel, and recording fault logs. Diagnostic results are reported through the management interface, facilitating quick problem location by maintenance personnel.

[0146] Local Management Interface: The main control MCU 250 runs a lightweight web server, allowing users to access the local management page by visiting the device's IP address through a browser. The management page provides a device status overview, network configuration, Wi-Fi settings, system maintenance, and other functions; the interface is user-friendly and easy to operate.

[0147] Mobile App Management: The main control MCU 250 connects to the mobile app via Bluetooth LE or Wi-Fi P2P, allowing users to perform operations such as device initialization configuration, network diagnostics, and guest Wi-Fi settings through the app, thus improving the user experience.

[0148] Design and Implementation of Power Module

[0149] The power module 260 is an integrated design that simultaneously powers the photoelectric / electro-optical conversion module 220, the Wi-Fi routing module 240, the second optical multiplexing / demultiplexing module 210, and the main control MCU 250. The specific implementation is as follows: Input voltage range: Supports wide voltage input (100-240V AC, 50 / 60Hz) to adapt to the power grid standards of different countries and regions. Also supports PoE power supply (802.3at / af), allowing users to choose the power supply method according to their actual needs.

[0150] Multiple outputs: The internal design employs a high-efficiency switching power supply, providing multiple regulated power outputs. +12V / 2A: Power supply for the laser driver circuit of the photoelectric / electro-optical conversion module 220. +5V / 3A: Power supply for the digital circuitry of the main control MCU 250 and the Wi-Fi routing module 240. +3.3V / 2A: Power supply for the second optical multiplexing / demultiplexing module 210 and the control circuit. +1.8V / 1A: Power supply for high-speed interface circuits Power Management: The main control MCU 250 communicates with the power module 260 via the I²C interface to monitor the output voltages, currents, and power module temperature in real time. When overcurrent, overvoltage, or overheating is detected, the power module automatically protects itself and reports an alarm.

[0151] EMI filtering: The power input terminal integrates a two-stage EMI filter, including a common-mode choke and X / Y capacitors, which effectively suppresses conducted interference on the power line and prevents interference from affecting other modules through the power line.

[0152] Backup power: Built-in supercapacitor or small lithium battery can provide uninterrupted power supply to the device during brief mains power outages (≤10 seconds), avoiding frequent device restarts that affect user experience.

[0153] The introduction of the main control MCU 250 enables intelligent management of user-side devices, achieving remote monitoring, fault diagnosis, and automatic recovery. Taking a residential building with 100 households as an example, in the traditional solution, each household's equipment requires individual on-site maintenance, with an average annual maintenance cost of approximately 50,000 yuan; this solution supports remote management, and 80% of faults can be resolved through remote diagnosis and repair, reducing the average annual maintenance cost to 15,000 yuan, a reduction of 70%.

[0154] The unified power supply design and multiple protection functions of the Power Module 260 significantly improve the reliability of the equipment. Real-world testing data shows that the mean time between failures (MTBF) has increased from 20,000 hours with traditional solutions to 50,000 hours. Simultaneously, the backup power design ensures that the equipment continues to operate normally during brief power outages, ensuring an uninterrupted internet experience for users.

[0155] The main control MCU 250's dynamic power management function can adjust the power output according to the actual load, enabling the device to maintain optimal power consumption at different times. Tests show that during low-load periods at night, the device's power consumption can be reduced from 12W at full load to 6W, a 30% reduction in average daily power consumption. Based on 1 million devices, this can save approximately 26 million kilowatt-hours of electricity and reduce carbon emissions by approximately 15,000 tons annually.

[0156] The unified power supply design of the power module 260 avoids the redundant investment of configuring a separate power supply circuit for each module, reducing PCB area by about 20%, the number of components by about 30%, and material costs by about 15%. At the same time, the centralized management function of the main control MCU 250 eliminates the need for each module to be configured with an independent management unit, further reducing system complexity.

[0157] Furthermore, The building-side signal processing unit is connected to multiple user-side radio frequency optical transmission units; The building-side signal processing unit is connected to the multiple user-side radio frequency optical transmission units via a 1×N optical splitter. The optical splitter is used to distribute the downlink optical signal power from the building side to each user-side radio frequency optical transmission unit and combine the uplink optical signals from each user-side radio frequency optical transmission unit to the building side.

[0158] The building-side signal processing unit 100 supports connection to multiple user-side radio frequency optical transmission units 200, and realizes an optical fiber distribution network through a 1×N optical splitter 400, as specifically implemented as follows: 1. System Topology The building-side signal processing unit 100 and multiple user-side radio frequency optical transmission units 200 adopt a point-to-multipoint passive optical network topology: Core equipment: The building-side signal processing unit 100 is configured with one or more first optical multiplexing / demultiplexing modules 130, each module providing at least one optical interface for connecting to the optical splitter 400.

[0159] Optical splitter: A 1×N evenly distributed PLC optical splitter is used, where N can be selected from 8, 16, 32, 64, etc., depending on the actual number of users. The optical splitter operates passively, requires no power supply, and is installed in the building's low-voltage electrical shaft or floor fiber distribution box.

[0160] User connection: Each output port of the optical splitter 400 is connected to a user-side radio frequency optical transmission unit 200 via a single-core optical fiber. Each user has a dedicated port, achieving physical isolation.

[0161] 2. Downward direction signal flow

[0162] Downlink (building side → user side) transmission uses broadcast method: Signal multiplexing: The first optical multiplexing / demultiplexing module 130 of the building-side signal processing unit 100 multiplexes the downlink mobile optical signal (λ1) and the downlink broadband optical signal (λ2) into a single multiplexed downlink optical signal.

[0163] Optical power allocation: The downlink optical signal is multiplexed into a 1×N optical splitter. The optical splitter divides the input optical signal into N paths, and the optical power of each path is 1 / N of the input optical power (considering insertion loss, the actual allocation loss is 10lgN + additional loss).

[0164] Signal transmission: The split optical signals are transmitted to the corresponding user-side radio frequency optical transmission unit 200 through their respective optical fibers.

[0165] User reception: The second optical multiplexing / demultiplexing module 210 of each user-side radio frequency optical transmission unit 200 receives the optical signal, performs demultiplexing and subsequent processing. Due to the use of broadcast mode, all users receive the same optical signal simultaneously, but each user only processes its own data (broadband data is filtered through the ONU's MAC address, and mobile signals are encrypted through the air interface to ensure information security).

[0166] 3. Upward direction signal flow

[0167] Uplink (user side → building side) transmission uses a combining method: User transmission: The second optical multiplexing / demultiplexing module 210 of each user-side radio frequency optical transmission unit 200 multiplexes the local uplink mobile optical signal (λ3) and uplink broadband optical signal (λ4) into a single multiplexed uplink optical signal, which is then transmitted to the optical splitter 400 via optical fiber.

[0168] Optical power combining: The optical splitter 400 combines the uplink optical signals from N users into one channel and sends it to the building-side signal processing unit 100. Due to the directionality of the optical splitter, combining will result in combining loss, but the uplink signals from different users are distinguished by wavelength (mobile signal λ3, broadband signal λ4) and will not interfere with each other.

[0169] Conflict avoidance: For broadband signals, TDMA is used to avoid conflicts, and time slots are uniformly allocated by the OLT at the central office; for mobile signals, uplink time slots are scheduled by the base station, and signals from different users are sent on different time slots or different resource blocks to ensure no conflict.

[0170] 4. Specific Deployment Examples

[0171] Taking a 30-story residential building with 4 units per floor, totaling 120 units as an example: Building-side equipment configuration: The building-side signal processing unit 100 is configured with four remote radio frequency units 110 (one shared by every 30 households). Each remote radio frequency unit corresponds to one radio frequency-to-optical conversion module 120 and one first optical multiplexing / demultiplexing module 130. Each first optical multiplexing / demultiplexing module 130 provides one optical interface to connect to one 1×32 optical splitter.

[0172] Optical splitter deployment: Four 1×32 PLC optical splitters are installed in the low-voltage electrical shaft on the second basement level, with each splitter covering approximately 30 households. The splitters are installed in standard 19-inch fiber optic distribution frames, occupying a height of 1U.

[0173] Fiber optic cabling: A 32-core fiber optic cable is laid from each optical splitter to the fiber distribution box on each floor, and then a single-core drop fiber optic cable is laid from the fiber distribution box to the home. G.657A2 bend-insensitive fiber is used to adapt to complex indoor cabling environments.

[0174] Power budget calculation: Building-side output optical power: +5dBm; Loss of a 1×32 optical splitter: 10lg32 + additional loss 1.5dB ≈ 16.5dB + 1.5dB = 18dB; Fiber optic transmission loss: maximum distance 500m × 0.35dB / km = 0.175dB (negligible); Connector loss: 2 connection points × 0.3dB = 0.6dB; User-side received optical power: 5dBm - 18dB - 0.6dB = -13.6dBm; User-side receiver sensitivity: -25dBm, with an 11.4dB margin, which meets the requirements.

[0175] 5. Selection and installation of optical splitters

[0176] Selection parameters: Operating wavelength: 1260nm~1650nm, covering all wavelengths from λ1 to λ4; Spectrophotometer ratio: 1×N, where N is selected based on the number of users, commonly 8, 16, 32, and 64; Insertion loss: 1×32 typical value ≤17dB, uniformity ≤1.5dB; Return loss: ≥50dB; Polarization-dependent loss: ≤0.3dB; Operating temperature: -40℃~+85℃.

[0177] Installation method: Rack-mount installation: The optical splitter modules are plugged into a standard 19-inch fiber optic patch panel. Each module is independently pluggable and removable, which facilitates maintenance and expansion. Wall-mounted installation: Install the fiber optic terminal box on the wall of the low-voltage shaft and fix the optical splitter inside the box. Suitable for small buildings. Connector type: Input ports use SC / APC or LC / APC, and output ports use SC / UPC or LC / UPC, which facilitates field termination.

[0178] 6. Wavelength planning in multi-user scenarios

[0179] To ensure no signal conflict in multi-user scenarios, this embodiment adopts the following wavelength planning: Mobile signal: All users share the same mobile signal wavelength (downlink λ1, uplink λ3). User differentiation in mobile communication is achieved through air interface layer encryption and scheduling, which is independent of wavelength.

[0180] Broadband signal: All users share the same broadband signal wavelength (downlink λ2, uplink λ4). User differentiation for broadband data is achieved through the ONU's MAC address and the time-division multiplexing mechanism of the PON system.

[0181] Management channel: Optional dedicated management wavelength λm (e.g., 1510nm) is available for management communication between the building side and the user side, enabling remote monitoring and configuration.

[0182] Technical points

[0183] 1. Key considerations for selecting an optical splitter

[0184] Splitting ratio selection: Choose the splitting ratio based on the actual number of users and future expansion needs. It is generally recommended to choose a splitting ratio of 1.5 times the current number of users to reserve capacity for future expansion. For example, if there are currently 20 users, a 1×32 splitter can be selected, which can be expanded to 32 users in the future.

[0185] Uniformity requirement: Select an optical splitter with good uniformity to ensure that the difference in optical power between each output port is ≤1.5dB, so as to avoid remote users being unable to work normally due to insufficient optical power.

[0186] Operating bandwidth: Ensure that the operating bandwidth of the optical splitter covers all used wavelengths (λ1~λ4) to avoid excessive loss of some wavelengths due to wavelength selectivity.

[0187] 2. Key Considerations for Power Budget Design

[0188] Worst-case calculation: The power budget should be calculated based on the worst-case scenario, including the maximum insertion loss of the optical splitter, the longest fiber distance, the maximum connector loss, and the additional loss caused by temperature changes, to ensure that all users can still meet the receiver sensitivity requirements under the worst conditions.

[0189] Marginal design: The system design should leave at least 3dB of power margin, taking into account factors such as device aging and environmental changes.

[0190] Dynamic range matching: The dynamic range of the user-side receiver should cover all possible optical power variations to avoid receiver saturation caused by strong optical signals.

[0191] 3. Uplink Conflict Avoidance Mechanism

[0192] Broadband signal: The PON system adopts the time division multiple access mechanism, with the OLT uniformly allocating uplink time slots. Each ONU sends data in the designated time slot to avoid collisions.

[0193] Mobile signals: The scheduling mechanism of the mobile communication system is adopted, and the uplink resources are allocated by the base station. Different users transmit on different time and frequency resources to ensure no conflict.

[0194] Burst mode reception: The receiver on the building side needs to support burst mode and be able to quickly adapt to the differences in optical power and phase between different users.

[0195] 4. Network reliability design

[0196] Backbone fiber optic cable protection: For important buildings, a 1+1 protection system for the backbone fiber optic cable can be adopted, which automatically switches to the backup fiber optic cable when the primary fiber optic cable fails.

[0197] Optical splitter redundancy: Two optical splitters can be configured as primary and backup, and automatic switching can be achieved through optical switches to improve system reliability.

[0198] User isolation: A single user failure (such as a fiber break) should not affect the normal communication of other users. The passive nature of optical splitters naturally achieves fault isolation.

[0199] This disclosed embodiment achieves point-to-multipoint connections through a 1×N optical splitter, significantly saving fiber optic resources. Multiple users share the building-side remote RF unit, RF-to-optic conversion module, and optical multiplexing / demultiplexing module, greatly improving equipment utilization. The passive optical splitter requires no power supply or maintenance, has an extremely low failure rate, and significantly improves network reliability. A single user failure does not affect other users, providing excellent fault isolation. The reserved ports on the optical splitter facilitate future expansion: when adding a new user, only the incoming fiber needs to be laid from the idle port of the optical splitter, without modifying the backbone network; when upgrading to a higher speed (such as 10G PON), only the building-side and user-side optical modules need to be replaced, without changing the optical distribution network. The equalization characteristic of the optical splitter ensures that each user receives the same optical power, and combined with power budget design, it can guarantee consistent signal quality for all users: the difference in optical power between the farthest and nearest users is controlled within 3dB; the received optical power on the user side is always in the center of the receiver's dynamic range, ensuring optimal reception performance. The system design has sufficient margin to adapt to device aging and environmental changes. Furthermore, the 1×N optical splitter offers various splitting ratios and installation methods, allowing for flexible adaptation to buildings of different sizes and structures.

[0200] This disclosed embodiment achieves significant technical benefits through an innovative architecture of "centralized processing and fiber-optic radio frequency transmission." First, it drastically reduces the cost and power consumption of user-side equipment: by centralizing complex 5G baseband processing functions on the building side, user-side equipment explicitly excludes baseband processing functions, retaining only photoelectric conversion and radio frequency transceiver modules. This eliminates the need for expensive digital baseband processing chips, reducing single-point costs by over 60% and power consumption by over 70%. Second, it achieves efficient resource utilization and high-quality signal coverage: by employing wavelength division multiplexing (WDM) technology to simultaneously transmit mobile signals and broadband data in the same optical fiber, it fully utilizes existing fiber-to-the-home resources and avoids redundant investment. The low-loss characteristics of fiber optic transmission ensure the transmission quality of radio frequency signals, providing reliable coverage for deep indoor scenarios. Third, it enhances equipment integration and deployment convenience: on the user side, MIMO antennas and Wi-Fi routers are deeply integrated into a single hardware component, sharing the casing, power supply, and management interface, achieving an integrated experience of "one device, two networks." Deployment is plug-and-play, reducing installation time by over 50%. Fourth, point-to-multipoint coverage is achieved through optical splitters, allowing building-side equipment to serve dozens of users, reducing fiber optic usage by 68% and construction costs by 65%. Fifth, enhanced system reliability and maintenance convenience: centralized core functions reduce failure points by 90%, support remote management, and improve operation and maintenance efficiency by 6 times; the main control MCU enables intelligent monitoring and interference coordination, ensuring concurrent performance of 5G and Wi-Fi. This provides a one-stop indoor coverage solution for broadband-mobile convergence scenarios.

[0201] Example 2

[0202] This disclosure aims to overcome the shortcomings of existing converged solutions, such as complex and costly user-side equipment, by providing a fixed-mobile converged indoor coverage system and method based on radio frequency optical transmission. Through an innovative "centralized processing, fiber-optic radio frequency transmission" architecture, the system simplifies user-side equipment into functional units that only perform photoelectric conversion and radio frequency transceiver functions, and deeply integrates 5G MIMO antennas and Wi-Fi routing. It centralizes complex baseband processing functions on the building side, achieving low-cost, high-performance, and easily deployable deep indoor coverage.

[0203] To achieve the above objectives, the present invention adopts the following technical solution: The fixed-mobile converged indoor coverage system based on radio frequency optical transmission has the following overall architecture: Figure 2 As shown, it includes: 1. Base station Located at the very top of the system, it is the source and destination of mobile communication signals.

[0204] It connects to the building-side signal processing unit to provide 4G / 5G mobile network signals.

[0205] 2. Building-side signal processing unit: Centrally deployed in the building's junction box or low-voltage shaft, including: (1) Remote radio frequency unit: Used to communicate with the operator's base station and complete the interaction between baseband signals and radio frequency signals. This unit can be an RRU or a repeater.

[0206] (2) Radio frequency to optical conversion module: realizes the mutual conversion between radio frequency signals and optical signals, and is used to modulate the downlink radio frequency signal output by the radio frequency unit such as RRU / repeater onto the optical carrier to form a downlink optical signal; and demodulate the uplink optical signal into a radio frequency signal and send it into the radio frequency unit.

[0207] 3. Optical splitter

[0208] Located between the building side and the user side, it adopts a 1×N passive optical splitter.

[0209] The multiplexed optical signal power from the building side is distributed to multiple user-side units, and the uplink optical signals from each user side are combined and transmitted back to the building side.

[0210] The building-side signal processing unit also includes an optical multiplexing / demultiplexing module (i.e., the first optical multiplexing / demultiplexing module in Embodiment 1) (not shown in the figure), which multiplexes the downlink mobile optical signal and the downlink broadband optical signal into a multiplexed downlink optical signal and sends it into the fixed-mobile fusion optical fiber; and performs demultiplexing processing on the received multiplexed uplink optical signal, separates the uplink mobile optical signal and sends it into the radio frequency-to-optical conversion module. II. User-Side Radio Frequency Optical Transmission Unit: As shown in the figure, there are multiple user-side units (Unit A, Unit B...Unit N). Each unit is an integrated device deployed indoors. This unit is a functionally simplified unit, and its core does not include 5G baseband processing functions; it only includes: (1) Optical multiplexing / demultiplexing module (or divided into optical multiplexer and optical demultiplexer; the optical multiplexing / demultiplexing module of the user-side radio frequency optical transmission unit is the second optical multiplexing / demultiplexing module in Embodiment 1): used to combine and separate the optical wavelengths carrying mobile signals and the optical wavelengths carrying fixed broadband data. For example, separating the mobile signal optical wave and the broadband data optical wave in the downlink optical signal, and multiplexing the uplink optical signal.

[0211] (2) Photoelectric / electro-optical conversion module: directly connected to the optical multiplexing / demultiplexing module, used to convert downlink optical signals into radio frequency signals and uplink radio frequency signals into optical signals.

[0212] (3) Mobile signal MIMO antenna: directly connected to the photoelectric / electro-optical conversion module, used to radiate and receive 4 / 5G mobile signals in the indoor space.

[0213] (4) Wi-Fi routing module: processes the separated fixed broadband data and provides high-speed Wi-Fi access, network address translation and routing functions.

[0214] (5) Shared structure and resources: The MIMO antenna and Wi-Fi antenna are physically isolated to reduce interference, and share the same device housing, power system, main control processor and management interface to form a single physical entity.

[0215] Each user-side unit corresponds to an indoor coverage area (Area A, Area B...Area N), providing mobile signal and Wi-Fi access to users within that area.

[0216] III. Fixed-mobile Fiber Synthesis: It connects the building-side signal processing unit to the optical splitter, and the optical splitter to each user-side unit.

[0217] Wavelength division multiplexing (WDM) technology is used, such as in the downlink direction, to simultaneously transmit mobile signal optical waves (λ1) and fixed broadband data optical waves (λ2) in the same optical fiber.

[0218] The building-side unit is connected to multiple user-side units, and wavelength division multiplexing technology is used to simultaneously transmit mobile signals (wavelength λ1) and fixed broadband data (wavelength λ2) in the same optical fiber.

[0219] The coverage method based on the above system includes the following steps: I. Downward direction: (1) The building-side signal processing unit modulates the radio frequency signal from the base station into a downlink optical signal, which is then multiplexed with the broadband data optical signal and transmitted to the user side through optical fiber. (2) The user-side unit demultiplexes the optical signal and directly converts the mobile optical signal into a radio frequency signal before radiating it through the antenna; at the same time, it converts the broadband data optical signal into a Wi-Fi signal; II. Upward direction: (1) The user-side unit directly converts the radio frequency signal received by the antenna into an uplink optical signal, which is then multiplexed with the Wi-Fi data optical signal and transmitted back to the building side via optical fiber; (2) The building-side unit demodulates the uplink optical signal into a radio frequency signal and sends it to the RRU / repeater and base station.

[0220] The detailed steps to implement the solution are as follows: Figure 3 and Figure 4 As shown.

[0221] Figure 3 For the downward direction (steps 110-190), including: 110-120: The signals from the operator's base station are received and processed by the remote radio frequency unit on the building side.

[0222] 130-140 (Core Conversion and Multiplexing): The processed downlink RF signal is modulated onto a specific wavelength optical carrier (λ1) by the RF-optical conversion module on the building side. Subsequently, this mobile signal optical wave and the downlink data optical wave (λ2) from the fixed broadband are combined into the same optical fiber through an optical multiplexer. This step realizes "fixed-mobile converged" transmission.

[0223] 150: Multiplexed optical signals are transmitted with low loss and high performance through existing broadband fiber optic networks.

[0224] 160-170 (Core Demodulation and Conversion): On the user side, the optical signal is first separated by an optical demultiplexer. The mobile signal light wave (λ1) is directly restored to the radio frequency signal by the photoelectric conversion module. Note that the user-side equipment does not perform complex 5G signal decoding in this process, but only photoelectric conversion, which is key to achieving low cost and high reliability.

[0225] 180-190: The restored radio frequency signal is radiated out through an optimized MIMO antenna and received by the indoor user's mobile phone. Simultaneously, the separated broadband data optical signal (λ2) is processed by the Wi-Fi routing module to provide high-speed internet access.

[0226] Figure 4 For the upward direction (steps 210-260), including: 210-220: The uplink radio frequency signal transmitted by the indoor mobile phone is captured by the MIMO antenna on the user side and immediately converted into an uplink optical signal (λ1) by the electro-optical conversion module. This optical signal is multiplexed with the uplink data optical signal (λ2) generated by the Wi-Fi module and transmitted back through the same optical fiber.

[0227] 230-250: The returned optical signal is separated on the building side, and the mobile signal optical wave (λ1) is restored to an radio frequency signal by the radio frequency to optical conversion module.

[0228] 260: This radio frequency signal is ultimately received by the RRU and sent back to the operator's base station, completing the entire communication loop.

[0229] Example 3

[0230] This disclosure provides a fixed-mobile fusion indoor coverage method based on radio frequency optical transmission, using any of the above-described systems, such as... Figure 5 As shown, it includes: Step S100: Communicate with the operator's base station through the remote radio frequency unit of the building-side signal processing unit; Step S200: The downlink radio frequency signal is modulated onto the optical carrier to form a downlink mobile optical signal through the radio frequency-to-optical conversion module of the building-side signal processing unit; Step S300: The downlink mobile optical signal and the downlink broadband optical signal are multiplexed into a multiplexed downlink optical signal through the first optical multiplexing / demultiplexing module and sent into the fixed-mobile fusion optical fiber; and the received multiplexed uplink optical signal is demultiplexed to separate the uplink mobile optical signal and send it into the radio frequency to optical conversion module. Step S400: The separated uplink mobile optical signal is demodulated into an uplink radio frequency signal by the radio frequency to optical conversion module; Step S500: Receive the multiplexed downlink optical signal from the fixed-mobile fusion optical fiber through the second optical multiplexing / demultiplexing module of the user-side radio frequency optical transmission unit, and separate it into a downlink mobile optical signal and a downlink broadband optical signal; and combine the uplink mobile optical signal and the uplink broadband optical signal into a multiplexed uplink optical signal and send it into the fixed-mobile fusion optical fiber; Step S600: The separated downlink mobile optical signal is directly converted into a downlink radio frequency signal through the photoelectric / electro-optical conversion module, and the uplink radio frequency signal received by the mobile signal MIMO antenna is directly converted into the uplink mobile optical signal. Step S700: Radiation and reception of mobile signals in the indoor space via the mobile signal MIMO antenna; Step S800: Receive the downlink broadband optical signal and process it into a Wi-Fi signal through the Wi-Fi routing module, and convert the uplink Wi-Fi data into the uplink broadband optical signal.

[0231] It should be noted that the flowcharts and step numbers provided in this embodiment are only for the purpose of clearly describing the technical solution of the present invention, and are not intended to limit the steps to be executed strictly in the order shown in the figures or numbers. Those skilled in the art should understand that, without departing from the concept of the present invention, the execution order of some steps can be adjusted, combined, or decomposed according to the actual application scenario, system configuration, or signal processing requirements. For example, some processing steps in the downlink direction can be executed in parallel with the processing steps in the uplink direction, or some initialization steps can be completed in advance. Any adjustment of the order, merging or decomposition of steps that does not substantially affect the achievement of the purpose of the present invention falls within the protection scope of the present invention.

[0232] Furthermore, the user-side radio frequency optical transmission unit does not perform baseband processing during the process of converting downlink optical signals into radio frequency signals.

[0233] Furthermore, when the building-side signal processing unit is connected to multiple user-side radio frequency optical transmission units, the downlink optical signal is broadcast to all user-side radio frequency optical transmission units through the optical splitter, and each user-side radio frequency optical transmission unit determines whether to receive and process the current signal through a preset identification mechanism.

[0234] The fixed-mobile fusion indoor coverage method based on radio frequency optical transmission in this disclosure is implemented based on the fixed-mobile fusion indoor coverage system based on radio frequency optical transmission in Embodiments 1 and 2, so the description is relatively simple. For details, please refer to the relevant descriptions in the previous embodiments, which will not be repeated here.

[0235] Figure 6 This is a block diagram of an electronic device provided in Embodiment 4 of this disclosure.

[0236] Reference Figure 6 This disclosure provides an electronic device comprising: at least one processor 701; at least one memory 702; and one or more I / O interfaces 703 connected between the processor 701 and the memory 702; wherein the memory 702 stores one or more computer programs executable by the at least one processor 701, the one or more computer programs being executed by the at least one processor 701 to enable the at least one processor 701 to execute the above-described fixed-mobile fusion indoor coverage method based on radio frequency optical transmission.

[0237] This disclosure also provides a computer-readable storage medium storing a computer program thereon, wherein the computer program, when executed by a processor, implements the aforementioned fixed-mobile fusion indoor coverage method based on radio frequency optical transmission. The computer-readable storage medium can be volatile or non-volatile.

[0238] This disclosure also provides a computer program product, including computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code. When the computer-readable code is run in the processor of an electronic device, the processor in the electronic device executes the above-described fixed-mobile fusion indoor coverage method based on radio frequency optical transmission.

[0239] 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 an integrated circuit, such as an application-specific integrated circuit (ASIC). Such software can be distributed on a computer-readable storage medium, which may include computer storage media (or non-transitory media) and communication media (or transient media).

[0240] As is known to those skilled in the art, the term computer storage medium includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information, such as computer-readable program instructions, data structures, program modules, or other data. Computer storage media includes, but is not limited to, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM), static random access memory (SRAM), flash memory or other memory technologies, portable compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, it is known to those skilled in the art that communication media typically contain computer-readable program 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.

[0241] The computer-readable program instructions described herein can be downloaded from computer-readable storage media to various computing / processing devices, or downloaded via a network, such as the Internet, local area network, wide area network, and / or wireless network, to an external computer or external storage device. The network may include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. A network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards them to the computer-readable storage media in the respective computing / processing device.

[0242] Computer program instructions used to perform the operations of this disclosure may be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-dependent instructions, microcode, firmware instructions, status setting data, or source code or object code written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Smalltalk, C++, etc., and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The computer-readable program instructions may execute entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving a remote computer, the remote computer may be connected to the user's computer via any type of network—including a local area network (LAN) or a wide area network (WAN)—or may be connected to an external computer (e.g., via the Internet using an Internet service provider). In some embodiments, electronic circuitry, such as programmable logic circuitry, field-programmable gate arrays (FPGAs), or programmable logic arrays (PLAs), is personalized by utilizing the status information of the computer-readable program instructions to implement various aspects of this disclosure.

[0243] The computer program product described herein can be implemented specifically through hardware, software, or a combination thereof. In one alternative embodiment, the computer program product is specifically embodied in a computer storage medium; in another alternative embodiment, the computer program product is specifically embodied in a software product, such as a software development kit (SDK), etc.

[0244] Various aspects of this disclosure are described herein with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this disclosure. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer-readable program instructions.

[0245] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing apparatus to produce a machine such that, when executed by the processor of the computer or other programmable data processing apparatus, they create means for implementing the functions / actions specified in one or more blocks of the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium that causes a computer, programmable data processing apparatus, and / or other device to operate in a particular manner; thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing aspects of the functions / actions specified in one or more blocks of the flowchart and / or block diagram.

[0246] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to perform the functions / actions specified in one or more boxes of a flowchart and / or block diagram.

[0247] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of the present disclosure. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of an instruction containing one or more executable instructions for implementing a specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order than those shown in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0248] Example embodiments have been disclosed herein, and while specific terminology has been used, it is for illustrative purposes only and should be construed as such, and is not intended to be limiting. In some instances, it will be apparent to those skilled in the art that features, characteristics, and / or elements described in connection with particular embodiments may be used alone, or in combination with features, characteristics, and / or elements described in connection with other embodiments, unless otherwise expressly indicated. Therefore, those skilled in the art will understand that various changes in form and detail may be made without departing from the scope of this disclosure as set forth by the appended claims.

Claims

1. A fixed-mobile fusion indoor coverage system based on radio frequency optical transmission, characterized in that, include: The building-side signal processing unit is centrally deployed within the building and includes at least a remote radio frequency unit, a radio frequency-to-optical conversion module, and a first optical multiplexing / demultiplexing module. The remote radio frequency unit is used to communicate with the operator's base station; The radio frequency to optical conversion module is used to modulate the downlink radio frequency signal onto the optical carrier to form a downlink mobile optical signal; The first optical multiplexing / demultiplexing module is used to multiplex the downlink mobile optical signal and the downlink broadband optical signal into a multiplexed downlink optical signal and send it into the fixed-mobile fusion optical fiber; and to demultiplex the received multiplexed uplink optical signal, separate the uplink mobile optical signal and send it into the radio frequency to optical conversion module. The radio frequency to optical conversion module is also used to demodulate the separated uplink mobile optical signal into an uplink radio frequency signal; The user-side radio frequency optical transmission unit is deployed indoors. The user-side radio frequency optical transmission unit is a simplified unit that does not include 5G baseband processing functions. It includes at least a second optical multiplexing / demultiplexing module, an optoelectronic / electro-optical conversion module, a mobile signal multiple-input multiple-output (MIMO) antenna, and a Wi-Fi routing module. The second optical multiplexing / demultiplexing module is used to receive the multiplexed downlink optical signal from the fixed-mobile fusion optical fiber, and separate it into a downlink mobile optical signal and a downlink broadband optical signal; and to combine the uplink mobile optical signal and the uplink broadband optical signal into a multiplexed uplink optical signal and send it into the fixed-mobile fusion optical fiber; The photoelectric / electro-optical conversion module is used to directly convert the separated downlink mobile optical signal into a downlink radio frequency signal, and to directly convert the uplink radio frequency signal received by the mobile signal MIMO antenna into the uplink mobile optical signal. The mobile signal MIMO antenna is connected to the photoelectric / electro-optical conversion module and is used to radiate and receive mobile signals in the indoor space. The Wi-Fi routing module is connected to the optical multiplexing / demultiplexing module and is used to receive the downlink broadband optical signal and process it into a Wi-Fi signal, and to convert uplink Wi-Fi data into the uplink broadband optical signal. The fixed-mobile converged optical fiber connects the building-side signal processing unit and the user-side radio frequency optical transmission unit, and uses wavelength division multiplexing technology to simultaneously transmit mobile signals and fixed broadband data in the same optical fiber.

2. The fixed-mobile fusion indoor coverage system based on radio frequency optical transmission according to claim 1, characterized in that, The mobile signal MIMO antenna and the Wi-Fi antenna of the Wi-Fi routing module are physically isolated to reduce interference; The mobile signal MIMO antenna and the Wi-Fi antenna of the Wi-Fi routing module share the same device casing, power system, main control processor and management interface, forming a single physical entity.

3. The fixed-mobile fusion indoor coverage system based on radio frequency optical transmission according to claim 2, characterized in that, The isolation design includes at least one of the following: In the PCB layout, the Wi-Fi RF circuit and the mobile signal RF circuit are respectively arranged on both sides of the PCB and a large area of ​​grounding via isolation strip is laid. A metal shield is installed outside the mobile signal MIMO antenna feed terminal and the low-noise amplifier; Insert a filter into the mobile signal radio frequency receiving link to filter out Wi-Fi band signals; Alternatively, the main control processor can coordinate the transmission time slots of the Wi-Fi chip to avoid the uplink reception sensitive time slots of the Time Division Duplex (TDD) configuration in mobile communication.

4. The fixed-mobile fusion indoor coverage system based on radio frequency optical transmission according to claim 1, characterized in that, The building-side signal processing units are centrally deployed in the building's junction boxes or low-voltage electrical shafts.

5. The fixed-mobile fusion indoor coverage system based on radio frequency optical transmission according to claim 2, characterized in that, The user-side radio frequency optical transmission unit also includes a main control microcontroller unit (MCU) and a power supply module. The main control MCU is connected to the photoelectric / electro-optical conversion module, the second optical multiplexing / demultiplexing module, and the Wi-Fi routing module for device management. The power supply module simultaneously supplies power to the photoelectric / electro-optical conversion module, the Wi-Fi routing module, the second optical multiplexing / demultiplexing module, and the main control MCU.

6. The fixed-mobile fusion indoor coverage system based on radio frequency optical transmission according to claim 1, characterized in that, The building-side signal processing unit is connected to multiple user-side radio frequency optical transmission units; The building-side signal processing unit is connected to the multiple user-side radio frequency optical transmission units via a 1×N optical splitter. The optical splitter is used to distribute the downlink optical signal power from the building side to each user-side radio frequency optical transmission unit and combine the uplink optical signals from each user-side radio frequency optical transmission unit to the building side.

7. A fixed-mobile fusion indoor coverage method based on radio frequency optical transmission according to any one of claims 1 to 6, characterized in that, include; Communicating with the operator's base station through the remote radio frequency unit of the building-side signal processing unit; The downlink radio frequency signal is modulated onto the optical carrier to form a downlink mobile optical signal through the radio frequency to optical conversion module of the building-side signal processing unit; The downlink mobile optical signal and the downlink broadband optical signal are multiplexed into a multiplexed downlink optical signal by the first optical multiplexing / demultiplexing module and sent into the fixed-mobile fusion optical fiber; and the received multiplexed uplink optical signal is demultiplexed to separate the uplink mobile optical signal and send it into the radio frequency to optical conversion module. The radio frequency to optical conversion module demodulates the separated uplink mobile optical signal into an uplink radio frequency signal. The second optical multiplexing / demultiplexing module of the user-side radio frequency optical transmission unit receives the multiplexed downlink optical signal from the fixed-mobile fusion optical fiber and separates it into a downlink mobile optical signal and a downlink broadband optical signal; and combines the uplink mobile optical signal and the uplink broadband optical signal into a multiplexed uplink optical signal and sends it into the fixed-mobile fusion optical fiber. The photoelectric / electro-optical conversion module directly converts the separated downlink mobile optical signal into a downlink radio frequency signal, and directly converts the uplink radio frequency signal received by the mobile signal MIMO antenna into the uplink mobile optical signal. The mobile signal MIMO antenna radiates and receives mobile signals in the indoor space. The Wi-Fi routing module receives the downlink broadband optical signal and processes it into a Wi-Fi signal, and converts the uplink Wi-Fi data into the uplink broadband optical signal.

8. The fixed-mobile fusion indoor coverage method based on radio frequency optical transmission according to claim 7, characterized in that, The user-side radio frequency optical transmission unit does not perform baseband processing during the process of converting downlink optical signals into radio frequency signals.

9. The fixed-mobile fusion indoor coverage method based on radio frequency optical transmission according to claim 7, characterized in that, When the building-side signal processing unit is connected to multiple user-side radio frequency optical transmission units, the downlink optical signal is broadcast to all user-side radio frequency optical transmission units through the optical splitter. Each user-side radio frequency optical transmission unit determines whether to receive and process the current signal through a preset identification mechanism.

10. An electronic device, characterized in that, include: At least one processor; as well as A memory communicatively connected to the at least one processor; wherein, The memory stores one or more computer programs that can be executed by the at least one processor, and the one or more computer programs are executed by the at least one processor to enable the at least one processor to perform the fixed-mobile fusion indoor coverage method based on radio frequency optical transmission as described in any one of claims 7-9.

11. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the fixed-mobile fusion indoor coverage method based on radio frequency optical transmission as described in any one of claims 7-9.

12. A computer program product, characterized in that, Includes computer-readable code, or a non-volatile computer-readable storage medium carrying computer-readable code, wherein when the computer-readable code is run in a processor of an electronic device, the processor in the electronic device performs the fixed-mobile fusion indoor coverage method based on radio frequency optical transmission as described in any one of claims 7-9.

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