Wireless access network equipment
By introducing intermediate frequency pooling units and analog optical modules into wireless access network equipment, the problems of high cost and power consumption of communication systems in indoor low-capacity scenarios are solved, achieving cost and energy consumption reduction and resource utilization improvement.
Patent Information
- Application Number
- CN202520231586.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-13
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2035-02-13
AI Technical Summary
In indoor low-capacity scenarios, the overall communication system cost and power consumption of wireless access network equipment are relatively high.
It adopts a structure of intermediate frequency pooling unit, baseband unit (BBU) and multiple radio frequency units (RRU). The intermediate frequency pooling unit centrally processes the signals of multiple RRUs, shares intermediate frequency processing and digital-to-analog conversion functions, and transmits analog signals in optical fiber through analog optical modules.
It reduces the overall cost and energy consumption of the communication system, and improves resource utilization and signal transmission quality.
Smart Images
Figure CN223772051U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of wireless technology, and in particular to a wireless access network device. Background Technology
[0002] Wireless access network equipment in related technologies typically consists of a baseband unit (BBU) and a remote radio unit (RRU). These two units achieve remote connection via a digital fronthaul interface. The RRU includes complete fronthaul interface processing, digital intermediate frequency processing, digital-to-analog / analog-to-digital conversion, and radio frequency transmission and reception modules. A picocell architecture usually comprises a baseband unit, an extension unit, and a radio frequency unit. However, in low-to-medium capacity indoor scenarios, multiple RRUs are typically combined into a single cell, resulting in higher overall communication system cost and power consumption. Utility Model Content
[0003] This application provides a wireless access network device to address the problem of high cost and power consumption of the overall communication system in related technologies.
[0004] To solve the above-mentioned technical problems, this application is implemented as follows:
[0005] This application provides a wireless access network device, which includes an intermediate frequency pooling unit, a baseband unit (BBU), and multiple radio frequency units (RRUs). The intermediate frequency pooling unit is connected to the BBU, and the multiple RRUs are respectively connected to the intermediate frequency pooling unit.
[0006] The intermediate frequency pooling unit includes a first digital intermediate frequency module, a digital-to-analog converter module, and a first analog optical module. The RRU includes a second analog optical module and an antenna. The first digital intermediate frequency module is connected to the digital-to-analog converter module, the digital-to-analog converter module is connected to the first analog optical module, the first analog optical module is connected to the second analog optical module, and the second analog optical module is connected to the antenna.
[0007] Optionally, the first analog optical module includes a first optical laser and a first optical receiver, the first optical laser and the first optical receiver being connected; the second analog optical module includes a second optical laser and a second optical receiver, the second optical laser and the second optical receiver being connected; the first optical receiver and the second optical laser are connected; the first optical laser and the second optical receiver are connected.
[0008] Optionally, the intermediate frequency pooling unit further includes an optical splitter, which includes an input terminal and multiple output terminals, and the first optical laser is connected to the input terminal of the optical splitter.
[0009] Optionally, the intermediate frequency pooling unit further includes an optical combiner, which includes multiple input terminals and output terminals, and the first optical receiver is connected to the output terminal of the optical combiner.
[0010] Optionally, the RRU further includes a radio frequency module, wherein the output terminal of the second analog optical module is connected to the input terminal of the radio frequency module, and the output terminal of the radio frequency module is connected to the antenna.
[0011] Optionally, the intermediate frequency pooling unit further includes a first frequency conversion module, wherein the output terminal of the first digital intermediate frequency module is connected to the input terminal of the first frequency conversion module, and the output terminal of the first frequency conversion module is connected to the input terminal of the first analog optical module;
[0012] The RRU further includes a second frequency conversion module, the output terminal of the second analog optical module is connected to the input terminal of the second frequency conversion module, the output terminal of the second frequency conversion module is connected to the input terminal of the radio frequency module, and the output terminal of the radio frequency module is connected to the antenna.
[0013] Optionally, the radio frequency unit further includes a second digital intermediate frequency module, which is connected to the radio frequency module.
[0014] Optionally, the intermediate frequency pooling unit further includes a first switching module, which is connected to the first frequency conversion module;
[0015] The RRU also includes a second switching module, and the second frequency conversion module and the radio frequency module are respectively connected to the second switching module.
[0016] Optionally, the intermediate frequency pooling unit further includes an amplification module, the output of the digital-to-analog conversion module is connected to the input of the amplification module, and the output of the amplification module is connected to the input of the first analog optical module.
[0017] Optionally, the wireless access network device further includes an optical fiber, through which the first analog optical module and the second analog optical module are connected.
[0018] In this embodiment, the aforementioned wireless access network device includes an intermediate frequency (IF) pooling unit, a BBU, and multiple RRUs. The IF pooling unit includes a first digital IF module, a digital-to-analog converter (DAC), and a first analog optical module. Each RRU includes a second analog optical module and an antenna. The first digital IF module is connected to the DAC, the DAC is connected to the first analog optical module, the first analog optical module is connected to the second analog optical module, and the second analog optical module is connected to the antenna. This allows the signals from the multiple RRUs to be centrally processed through the IF pooling unit, sharing and pooling functions such as IF processing and DAC, and carrying the transmission and distribution of analog signals, thereby reducing the overall communication system cost and energy consumption. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This is one of the structural schematic diagrams of a wireless access network device provided in the embodiments of this application;
[0021] Figure 2 This is a second schematic diagram of the structure of a wireless access network device provided in an embodiment of this application;
[0022] Figure 3 This is the third schematic diagram of the structure of a wireless access network device provided in the embodiments of this application;
[0023] Figure 4 This is the fourth schematic diagram of the structure of a wireless access network device provided in the embodiments of this application;
[0024] Figure 5 This is the fifth schematic diagram of the structure of a wireless access network device provided in the embodiments of this application;
[0025] Figure 6 This is the sixth schematic diagram of a wireless access network device provided in the embodiments of this application. Detailed Implementation
[0026] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0027] In this application embodiment, a wireless access network device is proposed to solve the problem of high cost and power consumption of the overall communication system in related technologies.
[0028] See Figure 1 , Figure 1 This is one of the structural schematic diagrams of a wireless access network device provided in the embodiments of this application, such as... Figure 1 As shown, the wireless access network device includes an intermediate frequency pooling unit, a baseband unit (BBU), and multiple radio frequency units (RRUs). The intermediate frequency pooling unit is connected to the BBU, and the multiple RRUs are respectively connected to the intermediate frequency pooling unit.
[0029] The intermediate frequency pooling unit includes a first digital intermediate frequency module 110, a digital-to-analog converter module 120, and a first analog optical module 130. The RRU includes a second analog optical module 210 and an antenna 220. The first digital intermediate frequency module 110 is connected to the digital-to-analog converter module 120, the digital-to-analog converter module 120 is connected to the first analog optical module 130, the first analog optical module 130 is connected to the second analog optical module 210, and the second analog optical module 210 is connected to the antenna 220.
[0030] Specifically, the aforementioned BBU can be used to send a first digital baseband signal to the intermediate frequency pooling unit, and to perform uplink processing on the second digital baseband signal sent by the intermediate frequency pooling unit. The aforementioned intermediate frequency pooling unit can be used to perform digital intermediate frequency processing and digital-to-analog conversion on the first digital baseband signal sent by the BBU to obtain a first analog signal, and send it to the plurality of RRUs; and to perform digital intermediate frequency processing and digital-to-analog conversion on the second analog signals sent by the plurality of RRUs to obtain a second digital baseband signal, and send it to the BBU. The aforementioned RRU can be used to send the first analog signal to the terminal, and to send the second analog signal sent by the terminal to the intermediate frequency pooling unit. The aforementioned antenna 220 can be used to send the first analog signal and receive the second analog signal.
[0031] Specifically, in the downlink direction, the digital intermediate frequency module is used to perform digital intermediate frequency processing on the first digital baseband signal sent by the BBU, and after digital predistortion processing, obtain a first digital signal; the digital-to-analog converter module 120 is used to convert the first digital signal into a first analog signal, and send it to the first analog optical module 130 through a splitter; the first analog optical module 130 is used to convert the first analog signal into a first analog optical signal, and send the first analog optical signal to the second analog optical module 210 through an optical fiber; the second analog optical module 210 is used to restore the first analog optical signal to the first analog signal and then amplify it; the antenna 220 is used to send the first analog signal to the terminal, and transmit it through the antenna 220.
[0032] Correspondingly, in the uplink direction, the processing procedure is the opposite of that in the downlink direction. The antenna 220 is used to receive the second analog signal sent by the terminal. The second analog optical module 210 is used to convert the second analog signal into a second analog optical signal and send the second analog optical signal to the first analog optical module 130. The first analog optical module 130 is used to convert the second analog optical signal into a second analog signal. The digital-to-analog converter module 120 is used to convert the second analog signal into a second digital signal. The digital intermediate frequency module is used to perform digital intermediate frequency processing on the second digital signal to obtain a second digital baseband signal, and send it to the BBU for uplink processing.
[0033] It is understood that the aforementioned RRU can complete the photoelectric and electro-optical conversion of analog signals through a hybrid optical-electric cable and the intermediate frequency pooling unit, and realize the transmission and reception of analog signals through antenna 220. In the downlink direction, the RRU feeds in two analog optical signals, converts the analog optical signals into analog signals, amplifies them, and transmits them directly; in the uplink direction, the RRU receives two analog signals, converts the two analog signals into analog optical signals, and sends them back to the intermediate frequency pooling unit.
[0034] In this embodiment, the wireless access network device includes an intermediate frequency (IF) pooling unit, a BBU, and multiple RRUs. The IF pooling unit includes a first digital IF module 110, a digital-to-analog converter (DAC) module 120, and a first analog optical module 130. Each RRU includes a second analog optical module 210 and an antenna 220. The first digital IF module 110 is connected to the DAC module 120, the DAC module 120 is connected to the first analog optical module 130, the first analog optical module 130 is connected to the second analog optical module 210, and the second analog optical module 210 is connected to the antenna 220. This allows the signals from the multiple RRUs to be centrally processed through the IF pooling unit, sharing and pooling functions such as IF processing and DAC, and carrying the transmission and distribution of analog signals, thereby reducing the overall communication system cost and energy consumption.
[0035] Optionally, the first analog optical module 130 includes a first optical laser and a first optical receiver, the first optical laser and the first optical receiver being connected; the second analog optical module 210 includes a second optical laser and a second optical receiver, the second optical laser and the second optical receiver being connected; the first optical receiver and the second optical laser are connected; the first optical laser and the second optical receiver are connected.
[0036] Specifically, the first laser can be used to convert the first analog signal into the first analog optical signal, and the first optical receiver can be used to convert the second analog optical signal into the second analog signal; the second laser can be used to convert the second analog signal into the second analog optical signal, and the second optical receiver can be used to convert the first analog optical signal into the first analog signal.
[0037] Understandably, since the intermediate frequency pooling unit transmits analog signals to the RRU, if the transmission distance is to be more than 200m indoors, the loss would be too great if traditional radio frequency cables were used, requiring an increase in the output signal power of the intermediate frequency pooling unit, which would lead to increased power consumption and cost. In this embodiment, the wireless access network device can convert the analog signal into an optical signal and transmit it in the optical fiber through the first analog optical module 130 and the second analog optical module 210, thereby further reducing the overall communication system cost and energy consumption.
[0038] Optionally, such as Figure 2 As shown, the intermediate frequency pooling unit further includes an optical splitter, which includes an input terminal and multiple output terminals. The first optical laser is connected to the input terminal of the optical splitter.
[0039] Specifically, the aforementioned splitter can be used to split the first analog optical signal converted by the first laser and send it to the second optical receiver of the plurality of RRUs respectively.
[0040] Understandably, because intermediate frequency (IF) pooling base stations need to cover a large indoor area, an IF pooling unit typically needs to extend to 8 RRUs. Therefore, without considering cost, an IF pooling unit requires at least 16 lasers to convert analog signals for 16 channels into optical signals. Meanwhile, in scenarios with lower capacity requirements, all RRUs under one IF pooling unit can be merged into one cell. In the downlink direction, the analog signal transmitted by the IF pooling unit to each RRU is the same; in the uplink direction, the signals received by each RRU can be directly superimposed using analog signals. Therefore, an optical splitter can be used to split the laser's optical signal into multiple paths for transmission to multiple RRUs in the downlink direction, while also having a combining function in the uplink direction, directly merging the uplink optical signals of multiple RRUs. For example, an IF pooling unit can be configured with only one laser and an 8-channel optical splitter to achieve the capability of connecting 8 RRUs, thereby reducing configuration costs.
[0041] In this embodiment, the intermediate frequency pooling unit further includes an optical splitter, which includes an input terminal and multiple output terminals. The first optical laser is connected to the input terminal of the optical splitter, so that the signal splitting transmission can be completed using the optical splitter, thereby reducing the number of first optical lasers and thus reducing configuration costs.
[0042] Optionally, such as Figure 2 As shown, the intermediate frequency pooling unit further includes an optical combiner, which includes multiple input terminals and output terminals. The first optical receiver is connected to the output terminal of the optical combiner.
[0043] Specifically, the aforementioned optical combiner is used to combine the second analog optical signals converted by the second lasers of the plurality of RRUs and send them to the first optical receiver.
[0044] In this embodiment, the intermediate frequency pooling unit further includes an optical combiner, which includes multiple input terminals and output terminals. The first optical receiver is connected to the output terminal of the optical combiner, so that the optical combiner can be used to complete signal combining and transmission, thereby reducing the number of first receivers and thus reducing configuration costs.
[0045] Optionally, such as Figure 1 As shown, the RRU also includes a radio frequency module 230, the output terminal of the second analog optical module 210 is connected to the input terminal of the radio frequency module 230, and the output terminal of the radio frequency module 230 is connected to the antenna 220.
[0046] Specifically, the radio frequency module 230 can be used to amplify the second analog optical signal converted by the second analog optical module 210 and send it to the antenna 220.
[0047] In this embodiment, the RRU further includes a radio frequency module 230. The output terminal of the second analog optical module 210 is connected to the input terminal of the radio frequency module 230, and the output terminal of the radio frequency module 230 is connected to the antenna 220, so that the amplitude of the signal can be amplified to ensure that the optical signal has sufficient energy during the transmission of light, thereby improving the signal transmission quality.
[0048] Optionally, such as Figure 3 As shown, the intermediate frequency pooling unit further includes a first frequency conversion module 140, the output terminal of the first digital intermediate frequency module 110 is connected to the input terminal of the first frequency conversion module 140, and the output terminal of the first frequency conversion module 140 is connected to the input terminal of the first analog optical module 130.
[0049] The RRU further includes a second frequency conversion module 240, the output terminal of the second analog optical module 210 is connected to the input terminal of the second frequency conversion module 240, the output terminal of the second frequency conversion module 240 is connected to the input terminal of the radio frequency module 230, and the output terminal of the radio frequency module 230 is connected to the antenna 220.
[0050] Specifically, the first frequency conversion module 140 and the second frequency conversion module 240 can be used to change the frequency band of the first analog signal and the second analog signal.
[0051] For example, the RRU's transmit frequency band is 28GHz. Taking downlink processing as an example, one channel's analog intermediate frequency (IF) is 5.1GHz, and the other channel's is 5.6GHz. After combining, they enter the laser and are transmitted over an optical fiber at wavelength λ1. Upon reaching the RRU, the 5.1GHz analog IF is upmixed to 28GHz, and the 5.6GHz analog IF is also upmixed to 28GHz before being transmitted. The uplink principle is similar, but the wavelength transmitted in the optical fiber is λ2.
[0052] In this embodiment, to meet future high-bandwidth evolution requirements, the intermediate frequency pooling unit further includes a first frequency conversion module 140. The output of the first digital intermediate frequency module 110 is connected to the input of the first frequency conversion module 140, and the output of the first frequency conversion module 140 is connected to the input of the first analog optical module 130. The RRU further includes a second frequency conversion module 240. The output of the second analog optical module 210 is connected to the input of the second frequency conversion module 240, and the output of the second frequency conversion module 240 is connected to the input of the radio frequency module 230. The output of the radio frequency module 230 is connected to the antenna 220. This allows the wireless access network device to transmit multiple uplink and downlink data in a single optical fiber through the first frequency conversion module 140 and the second frequency conversion module 240, thereby centralizing intermediate frequency processing and allowing multiple RRUs to share intermediate frequency processing resources, thus improving resource utilization.
[0053] Optionally, such as Figure 4 As shown, the radio frequency unit further includes a second digital intermediate frequency module 250, which is connected to the radio frequency module 230.
[0054] Specifically, the second digital intermediate frequency module 250 can be used to control each radio frequency head end to transmit a synchronization signal block (SSB) or receive a sounding reference signal (SRS) within a preset time period.
[0055] It should be noted that in related technologies, in network scenarios where multiple RRUs are combined into a single cell, during normal service, regardless of whether there are users on the RRUs, all radio heads transmit the same power signal during downlink, resulting in significant energy waste. During low-service periods, head units without service cannot enter sleep mode. Therefore, if the radio heads correspond to users, time-division multiplexing (SSB) transmission or time-division multiplexing (SRS) reception needs to be implemented. For radio units that are digital links, precise SSB / SRS time-division reception can be achieved.
[0056] In this embodiment, the radio frequency unit further includes a second digital intermediate frequency module 250, which is connected to the radio frequency module 230. This allows the second digital intermediate frequency module 250 to enable SSB time-division transmission and SRS time-division reception, thereby achieving more efficient resource utilization and energy saving.
[0057] Optionally, the intermediate frequency pooling unit further includes a first switching module 150, which is connected to the first frequency conversion module 140;
[0058] The RRU also includes a second switch module 260, and the second frequency conversion module 240 and the radio frequency module 230 are respectively connected to the second switch module 260.
[0059] Specifically, the first switch module 150 can be used to generate switch control signals corresponding to the plurality of RRUs respectively. These switch control signals are used to control the transmit and receive channels of the RRUs and are combined with service signals to different ports, supporting different RRUs controlling different signals. The second switch module 260 can be used to parse the switch control signals to control the transmit and receive channels; for example, it can directly recover the switch control signals by frequency conversion to control the transmit and receive channels.
[0060] For example, such as Figure 5 and Figure 6 As shown, the switch control signal can be modulated using an on-off keying (OOK) modulation scheme through the first switch module 150 of the intermediate frequency pooling unit, meaning that modulation can be achieved simply by using high and low levels. Demodulation of the RRU is also relatively simple; it only requires determining the presence or absence of the control signal to demodulate the signal.
[0061] The intermediate frequency (IF) pooling unit can directly generate 0 / 1 signals, shift them to a suitable frequency, and transmit the signals to the RRU. The RRU then down-converts the signals and restores them to 0 / 1 signals, directly controlling the switching of the RF channel. The IF pooling unit can independently generate switch control signals for each port, enabling precise transmission and shutdown at the headend, determining the relationship between the user and the RF headend, and simultaneously controlling signal and service combining. By combining signals independently for each port, the demodulation cost of the RF unit is reduced.
[0062] In this embodiment, the intermediate frequency pooling unit further includes a first switch module 150, which is connected to the first frequency conversion module 140. The RRU also includes a second switch module 260, which is connected to the second frequency conversion module 240 and the radio frequency module 230 respectively. This allows the intermediate frequency pooling unit to control the transmit and receive channels of the RRU through signals, thereby reducing the control cost of the RRU radio frequency channel.
[0063] Optionally, the intermediate frequency pooling unit further includes an amplification module 160, the output terminal of the digital-to-analog converter 120 is connected to the input terminal of the amplification module 160, and the output terminal of the amplification module 160 is connected to the input terminal of the first analog optical module 130.
[0064] Specifically, the amplification module 160 can be used to amplify the first analog signal converted by the digital-to-analog converter 120 and send it to the first analog optical module 130.
[0065] In this embodiment, the intermediate frequency pooling unit further includes an amplification module 160. The output terminal of the digital-to-analog converter module 120 is connected to the input terminal of the amplification module 160, and the output terminal of the amplification module 160 is connected to the input terminal of the first analog optical module 130. This allows the amplitude of the signal to be amplified to a power level suitable for subsequent processing by the first analog optical module 130, ensuring that the optical signal has sufficient energy during generation and transmission to overcome the loss of transmission media such as optical fibers, thereby achieving long-distance and high-quality transmission.
[0066] Optionally, the wireless access network device further includes an optical fiber, through which the first analog optical module 130 and the second analog optical module 210 are connected.
[0067] Specifically, the first analog optical module 130 and the second analog optical module 210 can transmit the first analog optical signal and the second analog optical signal through the optical fiber.
[0068] In the several embodiments provided in this application, it should be understood that, herein, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.
[0069] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make several improvements and modifications under the guidance of this application without departing from the principles described in this application. These improvements and modifications should also be considered within the scope of protection of this application.
Claims
1. A radio access network device, characterized by The wireless access network device comprises an intermediate frequency pooling unit, a baseband unit (BBU) and a plurality of radio frequency units (RRUs), the intermediate frequency pooling unit is connected with the BBU, and the plurality of RRUs are respectively connected with the intermediate frequency pooling unit; The intermediate frequency pooling unit comprises a first digital intermediate frequency module, a digital-to-analog conversion module and a first analog optical module, the RRU comprises a second analog optical module and an antenna, the first digital intermediate frequency module is connected with the digital-to-analog conversion module, the digital-to-analog conversion module is connected with the first analog optical module, the first analog optical module is connected with the second analog optical module, and the second analog optical module is connected with the antenna.
2. The apparatus of claim 1, wherein, The first analog optical module comprises a first optical laser and a first optical receiver, the first optical laser is connected with the first optical receiver, the second analog optical module comprises a second optical laser and a second optical receiver, and the second optical laser is connected with the second optical receiver; the first optical receiver is connected with the second optical laser, and the first optical laser is connected with the second optical receiver.
3. The apparatus of claim 2, wherein, The intermediate frequency pooling unit further comprises an optical splitter, the optical splitter comprises an input end and a plurality of output ends, and the first optical laser is connected with the input end of the optical splitter.
4. The apparatus of claim 2, wherein, The intermediate frequency pooling unit further comprises an optical combiner, the optical combiner comprises a plurality of input ends and an output end, and the first optical receiver is connected with the output end of the optical combiner.
5. The apparatus of claim 1, wherein, The RRU further comprises a radio frequency module, an output end of the second analog optical module is connected with an input end of the radio frequency module, an output end of the radio frequency module is connected with the antenna.
6. The apparatus of claim 5, wherein, The intermediate frequency pooling unit further comprises a first frequency conversion module, an output end of the first digital intermediate frequency module is connected with an input end of the first frequency conversion module, and an output end of the first frequency conversion module is connected with an input end of the first analog optical module. The RRU further comprises a second frequency conversion module, an output end of the second analog optical module is connected with an input end of the second frequency conversion module, an output end of the second frequency conversion module is connected with an input end of the radio frequency module, and an output end of the radio frequency module is connected with the antenna.
7. The apparatus of claim 5, wherein, The radio frequency unit further comprises a second digital intermediate frequency module, and the second digital intermediate frequency module is connected with the radio frequency module.
8. The apparatus of claim 6, wherein, The intermediate frequency pooling unit further comprises a first switch module, and the first switch module is connected with the first frequency conversion module. The RRU further comprises a second switch module, and the second frequency conversion module and the radio frequency module are respectively connected with the second switch module.
9. The apparatus of claim 1, wherein, The intermediate frequency pooling unit further comprises an amplification module, an output end of the digital-to-analog conversion module is connected with an input end of the amplification module, and an output end of the amplification module is connected with an input end of the first analog optical module.
10. The apparatus of claim 1, wherein, The wireless access network device further comprises an optical fiber, and the first analog optical module and the second analog optical module are connected through the optical fiber.