Intermediate frequency backup unit, system and method

Abstract

The present application relates to an intermediate frequency backup unit, system and method, wherein the intermediate frequency backup unit is connected to a first radio frequency unit in a base station, and the first radio frequency unit is connected to a baseband unit in the base station; when the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used to recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit; wherein the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; other intermediate frequency backup units are connected to the baseband unit via a second radio frequency unit in the base station. When the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit can re-establish the connection between the first radio frequency unit and the baseband unit through the intermediate frequency backup unit, thereby ensuring data integrity and improving system reliability.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to an intermediate frequency backup unit, system and method. Background Art

[0002] With the rapid development of high-speed mobile network construction, the Remote Radio Unit (RRU) has become an important part of the railway and tunnel mobile communication network. In the actual communication network, the baseband unit sends the baseband signal to the RRU through optical fiber, and the RRU converts the baseband signal into a radio frequency signal to achieve coverage. Due to the particularity of railway or tunnel mobile communication, the coverage system in the network must have backup technology to improve the reliability of mobile network communication.

[0003] In traditional technology, railway mobile, especially RRU in subway tunnel communication network, can adopt module backup, such as power backup; when the power module in RRU fails, signal transmission can be continued by switching to the backup power supply.

[0004] However, when the transmission optical fiber between the RRU and the baseband unit fails, it is impossible to establish a connection with the baseband device and complete signal coverage through the backup module, resulting in poor system reliability. Summary of the invention

[0005] Based on this, it is necessary to provide an intermediate frequency backup unit, system and method to address the above technical problems.

[0006] An intermediate frequency backup unit, the intermediate frequency backup unit is connected to a first radio frequency unit in a base station, and the first radio frequency unit is connected to a baseband unit in the base station;

[0007] In the case where the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used to recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit;

[0008] Among them, the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; the other intermediate frequency backup units are connected to the baseband unit through the second radio frequency unit in the base station.

[0009] In one of the embodiments, when the link between the first radio frequency unit and the baseband unit is normal and the link between the second radio frequency unit and the baseband unit is broken,

[0010] The intermediate frequency backup unit is also used to recover the uplink baseband signal sent by the second radio frequency unit from the uplink backup intermediate frequency signal received from other intermediate frequency backup units, and send the uplink baseband signal to the baseband unit;

[0011] The uplink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the uplink baseband signal.

[0012] In one embodiment, the intermediate frequency backup unit comprises: a baseband processing module, an analog intermediate frequency processing module and a splitter-combiner network connected in sequence;

[0013] In the case where the link between the first radio frequency unit and the baseband unit is broken,

[0014] The split-and-combine network is used to forward the received downlink backup intermediate frequency signal to the analog intermediate frequency processing module;

[0015] The analog intermediate frequency processing module is used to convert the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal, and send the first downlink digital intermediate frequency signal to the baseband processing module;

[0016] The baseband processing module is used to process the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal includes downlink data, a synchronization signal and a system clock signal; and send the downlink baseband signal to the first radio frequency unit.

[0017] In one of the embodiments, when the link between the first radio frequency unit and the baseband unit is normal and the link between the second radio frequency unit and the baseband unit is broken,

[0018] The split-and-combine network is used to forward the uplink backup intermediate frequency signal to the analog intermediate frequency processing module;

[0019] The analog intermediate frequency processing module is used to convert the uplink backup intermediate frequency signal into a first uplink digital intermediate frequency signal, and send the first uplink digital intermediate frequency signal to the baseband processing module;

[0020] The baseband processing module is used for processing the first uplink digital intermediate frequency signal to obtain an uplink baseband signal, and sending the uplink baseband signal to the baseband unit.

[0021] In one of the embodiments, the baseband processing module is further used to combine the uplink baseband signal with the uplink signal obtained by the first radio frequency unit, and send the combined signal to the baseband unit.

[0022] In one of the embodiments, in the case where the link between the first radio frequency unit and the baseband unit is broken, the baseband processing module is used to process the uplink baseband signal to obtain a second uplink digital intermediate frequency signal, and send the second uplink digital intermediate frequency signal to the analog intermediate frequency processing module;

[0023] The analog intermediate frequency processing module is used to convert the second uplink digital intermediate frequency signal into an uplink backup intermediate frequency signal, and send the uplink backup intermediate frequency signal through a splitter-combiner network.

[0024] In one of the embodiments, when the link between the first RF unit and the baseband unit is normal and the link between the second RF unit and the baseband unit is broken, the baseband processing unit is used to extract the system synchronization signal, the clock signal and the second downlink digital intermediate frequency signal from the downlink baseband signal received from the second RF unit, and send the second downlink digital intermediate frequency signal to the analog intermediate frequency processing module, and send the system synchronization signal and the clock signal to the splitter-combiner network;

[0025] The analog intermediate frequency processing module is used to convert the second downstream digital intermediate frequency signal into a downstream analog intermediate frequency signal, and send the downstream analog intermediate frequency signal to the splitter-combiner network;

[0026] The splitter-combiner network is used to combine the system synchronization signal, clock signal and downlink analog intermediate frequency signal to obtain a downlink backup intermediate frequency signal.

[0027] In one embodiment, the intermediate frequency backup unit further includes a clock processing unit; the clock processing unit is respectively connected to the baseband processing module and the splitter-combiner network;

[0028] When the link between the first radio frequency unit and the baseband unit is normal and the link between the second radio frequency unit and the baseband unit is broken, the system clock signal extracted by the baseband processing module is sent to the split-and-combine network;

[0029] In the case where the link between the first radio frequency unit and the baseband unit is broken, the system clock signal is set as the reference clock of the intermediate frequency backup unit.

[0030] In one embodiment, the above-mentioned splitter-combiner network is connected to multiple channels of the first radio frequency unit through multiple ports.

[0031] In one of the embodiments, the intermediate frequency backup unit further includes a monitoring unit; the monitoring unit is respectively connected to the baseband processing module and the splitter-combiner network, and is used to realize monitoring communication between the intermediate frequency backup unit and other intermediate frequency backup units, and / or between the intermediate frequency backup unit and the first radio frequency unit.

[0032] In one of the embodiments, the intermediate frequency backup unit is connected to the optical port of the first radio frequency unit; the intermediate frequency backup unit also includes a photoelectric conversion unit.

[0033] An intermediate frequency backup communication system, the intermediate frequency backup system comprising a baseband unit, a first radio frequency unit, a second radio frequency unit, a first intermediate frequency backup unit, a second intermediate frequency backup unit, a first combining unit and a second combining unit; the baseband unit is connected to the first radio frequency unit and the second radio frequency unit; the first radio frequency unit, the first intermediate frequency backup unit and the first combining unit are connected to each other; the second radio frequency unit, the second intermediate frequency backup unit and the second combining unit are connected to each other;

[0034] When the link between the first radio frequency unit and the baseband unit is broken and the link between the second radio frequency unit and the baseband unit is normal,

[0035] The second intermediate frequency backup unit is used to generate a downlink backup intermediate frequency signal according to the downlink baseband signal sent by the baseband unit; the first combining unit is used to combine the downlink backup intermediate frequency signal and the downlink radio frequency signal sent by the second radio frequency unit and then send them;

[0036] The first intermediate frequency backup unit is used to receive a downlink backup intermediate frequency signal through the first combining unit; restore the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal, and send the downlink baseband signal to the first radio frequency unit.

[0037] In one of the embodiments, the first intermediate frequency backup unit is further used to generate an uplink backup intermediate frequency signal according to the uplink baseband signal sent by the first radio frequency unit, and send the uplink backup intermediate frequency signal through the first combining unit;

[0038] The second intermediate frequency backup unit is also used to recover the uplink baseband signal sent by the first radio frequency unit from the uplink backup intermediate frequency signal received by the second combining unit, and send the uplink baseband signal to the baseband unit.

[0039] A medium frequency backup method, the method is applied to an medium frequency backup unit, the medium frequency backup unit is connected to a first radio frequency unit in a base station, and the first radio frequency unit is connected to a baseband unit in the base station; the method comprises:

[0040] In the event that the link between the first RF unit and the baseband unit is broken, the IF backup unit will recover the downlink baseband signal sent by the baseband unit from the downlink backup IF signal received from other backup IF devices, and send the downlink baseband signal to the first RF unit; wherein the downlink backup IF signal is generated by other IF backup units based on the downlink baseband signal; and the other IF backup units are connected to the baseband unit via the second RF unit in the base station.

[0041] In one of the embodiments, the above method also includes: the intermediate frequency backup unit will recover the uplink baseband signal sent by the second radio frequency unit from the uplink backup intermediate frequency signal received from other intermediate frequency backup units, and send the uplink baseband signal to the baseband unit; wherein the uplink backup intermediate frequency signal is generated by other intermediate frequency backup units based on the uplink baseband signal.

[0042] In the above-mentioned intermediate frequency backup unit, system and method, the intermediate frequency backup unit is connected to the first radio frequency unit in the base station, and the first radio frequency unit is connected to the baseband unit in the base station; in the case where the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used to recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit; wherein the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; other intermediate frequency backup units are connected to the baseband unit through the second radio frequency unit in the base station. Since other intermediate frequency backup units generate downlink backup intermediate frequency signals according to the downlink baseband signal, the intermediate frequency backup unit can recover the downlink baseband signal from the downlink backup intermediate frequency signal; further, since the intermediate frequency backup unit sends the downlink baseband signal to the first radio frequency unit, in the case where the link between the first radio frequency unit and the baseband unit is broken, the above-mentioned intermediate frequency backup unit can be used to realize the re-establishment of the connection between the first radio frequency unit and the baseband unit, thereby ensuring data integrity and improving system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] Figure 1 is an application environment diagram of an intermediate frequency backup unit in an embodiment;

[0044] Figure 2 A connection diagram of an intermediate frequency backup unit in an embodiment;

[0045] Figure 3 A connection diagram of an intermediate frequency backup unit in another embodiment;

[0046] Figure 4 is a structural block diagram of an intermediate frequency backup unit in another embodiment;

[0047] Figure 5 is a structural block diagram of an intermediate frequency backup unit in another embodiment;

[0048] Figure 6 is a structural block diagram of an intermediate frequency backup unit in another embodiment;

[0049] Figure 7 is a structural block diagram of an intermediate frequency backup unit in another embodiment;

[0050] Figure 8 is a structural block diagram of an intermediate frequency backup unit in another embodiment;

[0051] Fig. 9 FIG. 4 is a structural block diagram of an intermediate frequency backup communication system in an embodiment.

[0052] Description of reference numerals:

[0053] 10. Intermediate frequency backup unit; 20. Radio frequency unit; 30. Baseband unit;

[0054] 40. User equipment; 11. Other intermediate frequency backup units; 21. First radio frequency unit;

[0055] 22. Second radio frequency unit; 101. Baseband processing module; 102. Analog intermediate frequency processing module;

[0056] 103, splitting and combining network; 50, combining unit; 104, clock processing unit;

[0057] 105, monitoring unit; 106, photoelectric conversion unit; 12, first intermediate frequency backup unit;

[0058] 13. Second intermediate frequency backup unit; 41. First combining unit; 42. Second combining unit. DETAILED DESCRIPTION

[0059] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0060] The intermediate frequency backup unit provided in this application can be applied to Figure 1In the application environment shown. Among them, the intermediate frequency backup unit 10 is communicatively connected with the radio frequency unit 20 in the base station, and the radio frequency unit 20 is communicatively connected with the baseband unit 30; the radio frequency unit 20 is communicatively connected with the user equipment 40. The user equipment 40 may be, but is not limited to, a smart phone, a computer device, a portable wearable device, an Internet of Things device, a vehicle, a drone, an industrial equipment, and other devices with radio frequency receiving / transmitting functions; the standards that the base station may support include: Long Term Evolution (LTE), Wideband Code Division Multiple Access (WCDMA), Global System for Mobile (GSM), World Interoperability for Microwave Access (WiMax), Code Division Multiple Access (CDMA), and other standards such as the fifth generation mobile communication technology (5th-Generation, 5G).

[0061] In one embodiment, Figure 2 As shown, an intermediate frequency backup unit 10 is provided. The intermediate frequency backup unit 10 is connected to a first radio frequency unit 21 in a base station, and the first radio frequency unit 21 is connected to a baseband unit 30 in the base station.

[0062] In the case where the link between the first RF unit 21 and the baseband unit 30 is broken, the IF backup unit 10 is used to recover the downlink baseband signal sent by the baseband unit 30 from the downlink backup IF signal received from the other backup IF devices 11, and send the downlink baseband signal to the first RF unit 21. The downlink backup IF signal is generated by the other IF backup units 11 according to the downlink baseband signal; the other IF backup units 11 are connected to the baseband unit 30 through the second RF unit 22 in the base station.

[0063] The baseband unit 30 mainly implements baseband protocol processing. The baseband unit 30 may be a baseband unit (BBU) in an LTE base station, a WCDMA base station, a 5G base station, or a WiMax base station, or a distributed unit (DU) in a 5G base station; the type of the baseband unit 30 is not limited here.

[0064] The first RF unit 21 and the second RF unit 22 are connected to the same baseband unit 30, and are mainly used to realize the conversion between baseband signals and RF signals and the transceiver processing functions of RF signals. For example, in the downlink direction, the first RF unit 21 and the second RF unit 22 can receive the baseband signal transmitted from the baseband unit 30, and after the transmission link processing such as up-conversion, digital-to-analog conversion, RF modulation, filtering, and signal amplification, they are transmitted through the switch and antenna unit. In the uplink direction, the first RF unit 21 and the second RF unit 22 can receive the RF signal sent by the user equipment through the antenna unit, and after the reception link processing such as low noise amplification, filtering, and demodulation, analog-to-digital conversion and down-conversion are performed to obtain the baseband signal and send it to the baseband unit 30.

[0065] The above-mentioned first RF unit 21 and the second RF unit 22 can be RRUs in LTE base stations, WCDMA base stations, 5G base stations or WiMax base stations, or they can be AAUs in 5G base stations, wherein the AAU integrates a RF unit and an antenna unit; in addition, they can also be micro base station RF units, etc. The types of the above-mentioned first RF unit 21 and the second RF unit 22 are not limited here.

[0066] The intermediate frequency backup unit 10 is used to realize the conversion between the baseband signal and the intermediate frequency signal. The downlink backup intermediate frequency signal can be converted into a baseband signal, and the downlink backup intermediate frequency signal can also be generated according to the downlink baseband signal.

[0067] The baseband unit 30 of the above-mentioned base station can be connected to multiple RF units, and the above-mentioned RF units can be connected to the corresponding intermediate frequency backup units 10 respectively, or some of the multiple RF units can be connected to the corresponding intermediate frequency backup units 10, which is not limited here.

[0068] Each intermediate frequency backup unit in the base station system can be in a default reception state. When the link between the first radio frequency unit 21 and the baseband unit 30 is broken, the baseband unit 30 can determine one of the radio frequency units adjacent to the first radio frequency unit 21, the second radio frequency unit 22, and then control the other intermediate frequency backup devices 11 connected to the second radio frequency unit 22 to broadcast the downlink backup intermediate frequency signal.

[0069] When the above-mentioned other intermediate frequency backup device 11 generates a downlink backup intermediate frequency signal according to the downlink baseband signal, the intermediate frequency frequency of the above-mentioned downlink backup intermediate frequency signal can be the intermediate frequency frequency in the process of converting the downlink baseband signal into a downlink radio frequency signal in the first radio frequency unit 21, or it can be other intermediate frequency frequencies, which is not limited here.

[0070] After the intermediate frequency backup unit 10 receives the above-mentioned downlink backup intermediate frequency signal through the antenna, it can establish a connection with the baseband unit 30 according to the downlink backup intermediate frequency signal. For example, it can achieve clock synchronization and transmission timing synchronization with the baseband unit. After the intermediate frequency backup unit 10 establishes a connection with the baseband unit 30, the downlink baseband signal extracted based on the downlink backup intermediate frequency signal is sent to the first radio frequency unit 21, so that the first radio frequency unit 21 establishes a connection with the baseband unit 30. The first radio frequency unit 21 receives the downlink baseband signal sent by the baseband unit 30 through the intermediate frequency backup unit 10, and after processing the downlink baseband to obtain the downlink radio frequency signal, it sends it through the antenna to achieve signal coverage.

[0071] The intermediate frequency backup unit 10 can be powered by the first radio frequency unit 10 and connected to the power module of the first radio frequency unit 10 through a DC power supply port.

[0072] The above-mentioned intermediate frequency backup unit 10 is an independent network element. When implementing the system backup in the base station system, the staff can flexibly select the radio frequency unit 20 that needs to be backed up to configure the intermediate frequency backup unit; when configuring the intermediate frequency backup unit 10 for the radio frequency unit 20, it is not necessary to destroy the existing transmission network, nor to add other backup resources, such as power amplifier backup or power supply backup, etc., to reduce the cost of system backup. In addition, since the downlink backup intermediate frequency signal has the characteristics of small insertion loss and long propagation distance, the signal amplitude of the downlink backup intermediate frequency signal can be effectively controlled; since the frequency of the downlink backup intermediate frequency signal is relatively far away from the frequency interval of the radio frequency signal output by the first radio frequency unit 21, the interference of the intermediate frequency signal transmission on the radio frequency signal coverage is reduced.

[0073] The above-mentioned intermediate frequency backup unit is connected to the first radio frequency unit in the base station, and the first radio frequency unit is connected to the baseband unit in the base station; in the case that the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used to recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit; wherein the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; other intermediate frequency backup units are connected to the baseband unit through the second radio frequency unit in the base station. Since other intermediate frequency backup units generate downlink backup intermediate frequency signals according to the downlink baseband signal, the intermediate frequency backup unit can recover the downlink baseband signal from the downlink backup intermediate frequency signal; further, since the intermediate frequency backup unit sends the downlink baseband signal to the first radio frequency unit, in the case that the link between the first radio frequency unit and the baseband unit is broken, the above-mentioned intermediate frequency backup unit can be used to realize the re-establishment of the connection between the first radio frequency unit and the baseband unit, thereby ensuring data integrity and improving system reliability.

[0074] In one embodiment, it involves the data connection relationship between the intermediate frequency backup unit 10 and other equipment units during the uplink process. Figure 3 As shown, when the link between the first RF unit 21 and the baseband unit 30 is normal and the link between the second RF unit 22 and the baseband unit 30 is broken, the intermediate frequency backup unit 10 is also used to recover the uplink baseband signal sent by the second RF unit 22 from the uplink backup intermediate frequency signal received from other intermediate frequency backup units 11, and send the uplink baseband signal to the baseband unit 30; wherein the uplink backup intermediate frequency signal is generated by other intermediate frequency backup units 11 according to the uplink baseband signal.

[0075] When the link between the first RF unit 21 and the baseband unit 30 is normal and the link between the second RF unit 22 and the baseband unit 30 is broken, the baseband unit 30 can, according to the principle of the above embodiment, instruct the intermediate frequency backup unit 10 connected to the first RF unit 21 to broadcast a downlink backup intermediate frequency signal. After the second RF unit 22 establishes a connection with the baseband unit 30 based on the downlink backup intermediate frequency signal, it can send an uplink baseband signal to the baseband unit 30 based on the connection.

[0076] Specifically, after receiving the uplink RF signal sent by the user equipment, the second RF unit 22 can convert the uplink RF signal into an uplink baseband signal. Then, the second RF unit 22 can send the uplink baseband signal to other intermediate frequency backup units 11, so that other intermediate frequency backup units 11 can generate an uplink backup intermediate frequency signal according to the uplink baseband signal and broadcast it.

[0077] The baseband unit 30 may instruct the intermediate frequency backup unit 10 to receive the above-mentioned uplink backup intermediate frequency signal, then recover the above-mentioned uplink baseband signal from the above-mentioned backup intermediate frequency signal, and then send the above-mentioned uplink baseband signal to the baseband unit 30 through the first radio frequency unit 21. Specifically, the intermediate frequency backup unit 10 may return the uplink baseband signal sent by the second radio frequency unit 22 to the baseband unit separately through the first radio frequency unit 21, or may combine the above-mentioned uplink baseband signal with the baseband signal generated by the first radio frequency unit 21 based on user data, and then return the combined baseband signal to the baseband unit 30, which is not limited here.

[0078] When the above-mentioned other intermediate frequency backup device 11 generates an uplink backup intermediate frequency signal according to the uplink baseband signal, the intermediate frequency frequency of the above-mentioned uplink backup intermediate frequency signal may be the same as or different from the frequency of the downlink backup intermediate frequency signal; for example, in a base station system in TDD mode, the frequency of the above-mentioned downlink backup intermediate frequency signal may be the same as the intermediate frequency frequency of the uplink backup intermediate frequency signal.

[0079] After receiving the uplink baseband signal, the baseband unit 30 may process the baseband signal to effectively ensure data integrity of the user equipment accessing the second radio frequency unit 22 .

[0080] The above-mentioned intermediate frequency backup unit converts the uplink baseband signal of the second radio frequency unit 22 into an uplink backup intermediate frequency signal, and recovers the uplink baseband signal from the uplink backup intermediate frequency signal, and then sends the uplink baseband signal to the baseband unit 30, so that the connection between the second radio frequency unit 22 and the baseband unit 30 is connected, thereby ensuring the data integrity of the user equipment.

[0081] Figure 4 FIG. 1 is a connection diagram of an intermediate frequency backup unit in another embodiment. This embodiment relates to an intermediate frequency backup unit 10 in the case where a link between a first radio frequency unit and a baseband unit is disconnected. Based on the above embodiment, as shown in FIG. Figure 4 As shown, the intermediate frequency backup unit 10 comprises: a baseband processing module 101, an analog intermediate frequency processing module 102 and a splitter / combiner network 103 which are connected in sequence.

[0082] During the downlink process, the splitter-combiner network 103 is used to forward the received downlink backup intermediate frequency signal to the analog intermediate frequency processing module 102; the analog intermediate frequency processing module 102 is used to convert the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal, and send the first downlink digital intermediate frequency signal to the baseband processing module 101; the baseband processing module 101 is used to process the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal includes downlink data, a synchronization signal and a system clock signal; and the downlink baseband signal is sent to the first radio frequency unit 21.

[0083] Among them, the analog intermediate frequency processing module 102 can amplify and frequency convert the received downlink backup intermediate frequency signal, and then convert it into a first downlink digital intermediate frequency signal through the RF conversion chip; the above-mentioned analog intermediate frequency processing module 102 can include one receiving channel or multiple receiving channels, and the number of channels is related to the number of RF conversion chips and the number of channels.

[0084] The baseband processing module 101 extracts the synchronization signal and the system clock signal from the first downlink digital intermediate frequency signal and obtains downlink data. The synchronization signal is used to achieve the synchronization of the receiving and transmitting timing between the first radio frequency unit 21 and the intermediate frequency backup unit 10 and the baseband unit 30. The system clock signal is used to achieve the frequency synchronization between the first radio frequency unit 21 and the intermediate frequency backup unit 10 and the baseband unit 30. For example, the system clock signal can be processed by power division in the intermediate frequency backup unit 10, and the system clock signal can be divided into multiple branches, which are respectively sent to the phase-locked loop circuit, the FPGA circuit and the radio frequency conversion chip as reference clocks.

[0085] After the baseband processing module 101 sends the downlink baseband signal to the first radio frequency unit 21, the first radio frequency unit 21 may convert the downlink baseband signal into a downlink radio frequency signal and send the converted signal to achieve signal coverage.

[0086] Specifically, the above-mentioned first radio frequency unit 21 can extract the synchronization signal and the system clock signal at the starting time domain position of the received 10 millisecond frame, obtain the uplink and downlink time slot ratio, special subframe configuration, and uplink and downlink switch switching signals in the synchronization signal, and set the received system clock signal as the reference clock of the first radio frequency.

[0087] During the uplink process, the baseband processing module 101 is used to process the uplink baseband signal to obtain a second uplink digital intermediate frequency signal, and send the second uplink digital intermediate frequency signal to the analog intermediate frequency processing module 102; the analog intermediate frequency processing module 102 is used to convert the second uplink digital intermediate frequency signal into an uplink backup intermediate frequency signal, and send the uplink backup intermediate frequency signal through the splitter-combiner network 103.

[0088] The baseband processing module 101 may include a variable multiple decimation link for processing the uplink baseband signal, for example, different decimation multiples correspond to different carrier bandwidths, and the initial sampling rate is 30.72Msps; and also includes a gain control link for compensating for the transmission loss of the leaky cable signal.

[0089] Figure 5 FIG. 1 is a connection diagram of an intermediate frequency backup unit in another embodiment. This embodiment relates to a case where the link between the first radio frequency unit 21 and the baseband unit 30 is normal and the link between the second radio frequency unit 22 and the baseband unit 30 is broken. On the basis of the above embodiment, the intermediate frequency backup unit 10 connected to the first radio frequency unit is as follows: Figure 5 In the uplink process, the splitter-combiner network 103 is used to forward the uplink backup intermediate frequency signal to the analog intermediate frequency processing module 102; the analog intermediate frequency processing module 102 is used to convert the uplink backup intermediate frequency signal into a first uplink digital intermediate frequency signal, and send the first uplink digital intermediate frequency signal to the baseband processing module 101; the baseband processing module 101 is used to process the first uplink digital intermediate frequency signal, obtain an uplink baseband signal, and send the uplink baseband signal to the baseband unit 30.

[0090] When the baseband processing module 101 sends the uplink baseband signal to the baseband unit 30 , the uplink baseband signal may be combined with the uplink signal obtained by the first radio frequency unit 21 , and the combined signal may be sent to the baseband unit.

[0091] In the downlink process, the baseband processing unit 101 is used to extract the system synchronization signal, the clock signal and the second downlink digital intermediate frequency signal from the downlink baseband signal received from the first radio frequency unit 21, and send the second downlink digital intermediate frequency signal to the analog intermediate frequency processing module 102, and send the system synchronization signal and the clock signal to the splitter-combiner network 103. The system synchronization signal and the clock signal can be modulated by FSK modulation.

[0092] The analog intermediate frequency processing module 102 is used to convert the second downstream digital intermediate frequency signal into a downstream analog intermediate frequency signal, and send the downstream analog intermediate frequency signal to the splitter-combiner network 103.

[0093] The splitter-combiner network 103 is used to combine the system synchronization signal, the clock signal and the downlink analog intermediate frequency signal to obtain a downlink backup intermediate frequency signal.

[0094] After the split-and-combine network 103 obtains the downlink backup intermediate frequency signal, the downlink backup intermediate frequency signal can be sent to the antenna unit and broadcasted through the antenna.

[0095] Specifically, the splitter-combiner network 103 may send the downlink backup intermediate frequency signal to the combining unit 50, and the combining unit 50 combines the downlink backup intermediate frequency signal with the downlink radio frequency signal sent by the first radio frequency unit 21 and then sends the signal to the antenna port.

[0096] The split-and-combine network 103 can combine the downlink backup intermediate frequency signal with the downlink radio frequency signal sent by one of the channels in the first radio frequency unit 21 through the combining unit 50. Optionally, the split-and-combine network 103 can be connected to the multiple channels of the first radio frequency unit through multiple ports 1031. For example, when the first radio frequency unit 21 includes 4 channels, the split-and-combine network 103 can output 4 downlink backup intermediate frequency signals through multiple ports, and combine them with the downlink radio frequency signals output by the 4 channels respectively.

[0097] The combining unit 50 may include an intermediate frequency filter and an RF filter, respectively filtering the downlink backup intermediate frequency signal and the downlink RF signal, and then transmitting the combined signal to the antenna port.

[0098] The above-mentioned intermediate frequency backup unit includes a baseband processing module, an analog intermediate frequency processing module and a splitter-combiner network, so that the intermediate frequency backup unit can realize the conversion between the baseband signal and the intermediate frequency backup signal when the link between the first radio frequency unit and the baseband unit is broken, thereby ensuring the normal data transmission between the first radio frequency unit and the baseband unit.

[0099] In one embodiment, Figure 6As shown, on the basis of the above embodiment, the above intermediate frequency backup unit also includes a clock processing unit 104; the clock processing unit 104 is respectively connected to the baseband processing module 101 and the split-and-combine network 103; when the link between the first radio frequency unit 21 and the baseband unit 30 is normal and the link between the second radio frequency unit 22 and the baseband unit 30 is broken, the system clock signal extracted by the baseband processing module 101 is sent to the split-and-combine network 103; when the link between the first radio frequency unit 21 and the baseband unit 30 is broken, the system clock signal is set to the reference clock of the intermediate frequency backup unit 10.

[0100] The intermediate frequency backup unit includes a clock processing unit, which can achieve clock synchronization through clock switching, thereby ensuring smooth data transmission between the first radio frequency unit and the baseband unit.

[0101] In one embodiment, Figure 7 As shown, based on the above embodiment, the above-mentioned intermediate frequency backup unit 21 also includes a monitoring unit 105; the monitoring unit 105 is respectively connected to the baseband processing module 101 and the splitter-combiner network 103, for realizing monitoring communication between the intermediate frequency backup unit 10 and other intermediate frequency backup units 11, and / or between the intermediate frequency backup unit 10 and the first radio frequency unit 21.

[0102] The monitoring communication may include the intermediate frequency backup unit 10 reporting the monitoring status to the first radio frequency unit 21, or the first radio frequency unit 21 sending a switch control instruction and alarm processing to the intermediate frequency backup unit 10. The type of the monitoring communication is not limited here.

[0103] In one embodiment, Figure 8 As shown, based on the above embodiment, the intermediate frequency backup unit 10 is connected to the optical port of the first radio frequency unit 21; the intermediate frequency backup unit 10 also includes an optoelectronic conversion unit 106. The optoelectronic conversion unit 106 is used to realize optoelectronic conversion of baseband signals.

[0104] In one embodiment, an intermediate frequency backup communication system is provided, such as Fig. 9As shown, the intermediate frequency backup system includes a baseband unit 30, a first radio frequency unit 21, a second radio frequency unit 22, a first intermediate frequency backup unit 12, a second intermediate frequency backup unit 13, a first combiner unit 41 and a second combiner unit 42; the baseband unit 30 is connected to the first radio frequency unit 21 and the second radio frequency unit 22; the first radio frequency unit 21, the first intermediate frequency backup unit 11 and the first combiner unit 41 are connected to each other; the second radio frequency unit 22, the second intermediate frequency backup unit 12 and the second combiner unit 42 are connected to each other; the link between the first radio frequency unit 21 and the baseband unit 30 In the case where the link is broken and the link between the second RF unit 22 and the baseband unit 30 is normal, the second IF backup unit 12 is used to generate a downlink backup IF signal according to the downlink baseband signal sent by the baseband unit 30; the first combiner unit 51 is used to combine the downlink backup IF signal and the downlink RF signal sent by the second RF unit and then send them; the first IF backup unit 11 is used to receive the downlink backup IF signal through the first combiner unit 51, restore the downlink baseband signal sent by the baseband unit 30 from the downlink backup IF signal, and send the downlink baseband signal to the first RF unit 21.

[0105] In one embodiment, based on the above embodiment, the first intermediate frequency backup unit 11 is also used to generate an uplink backup intermediate frequency signal according to the uplink baseband signal sent by the first radio frequency unit 21, and send the uplink backup intermediate frequency signal through the first combining unit; the second intermediate frequency backup unit 12 is also used to receive the uplink backup intermediate frequency signal through the second combining unit 52; restore the uplink baseband signal sent by the first radio frequency unit 21 from the uplink backup intermediate frequency signal, and send the uplink baseband signal to the baseband unit 30.

[0106] The implementation principle and technical effect of the intermediate frequency backup communication system provided in this embodiment are similar to those of the above-mentioned intermediate frequency backup unit embodiment, and will not be described in detail here.

[0107] In one embodiment, an intermediate frequency backup method is provided. The method is applied to an intermediate frequency backup unit. The intermediate frequency backup unit is connected to a first radio frequency unit in a base station. The first radio frequency unit is connected to a baseband unit in the base station. The method includes:

[0108] In the case where the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit will recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit;

[0109] Among them, the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; the other intermediate frequency backup units are connected to the baseband unit through the second radio frequency unit in the base station.

[0110] The intermediate frequency backup method provided in this embodiment has the same implementation principle and technical effect as Figure 2 The corresponding embodiments of the intermediate frequency backup unit are similar and will not be described in detail here.

[0111] In one embodiment, based on the above method, the above method further includes:

[0112] The intermediate frequency backup unit will recover the uplink baseband signal sent by the second radio frequency unit from the uplink backup intermediate frequency signal received from other intermediate frequency backup units, and send the uplink baseband signal to the baseband unit;

[0113] The uplink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the uplink baseband signal.

[0114] The intermediate frequency backup method provided in this embodiment has the same implementation principle and technical effect as Figure 3 The corresponding embodiments of the intermediate frequency backup unit are similar and will not be described in detail here.

[0115] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0116] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An intermediate frequency backup unit, It is characterized in that The intermediate frequency backup unit is connected to the first radio frequency unit in the base station, and the first radio frequency unit is connected to the baseband unit in the base station; In the case where the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used to recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit; Wherein, the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; the other intermediate frequency backup units are connected to the baseband unit through the second radio frequency unit in the base station; The intermediate frequency backup unit comprises: a baseband processing module, an analog intermediate frequency processing module and a splitter-combiner network connected in sequence; In the event that the link between the first RF unit and the baseband unit is broken, the splitter-combiner network is used to forward the received downlink backup intermediate frequency signal to the analog intermediate frequency processing module; the analog intermediate frequency processing module is used to convert the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal, and send the first downlink digital intermediate frequency signal to the baseband processing module; the baseband processing module is used to process the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal includes downlink data, a synchronization signal and a system clock signal; and the downlink baseband signal is sent to the first RF unit.

2. The intermediate frequency backup unit according to claim 1, It is characterized in that In the case where the link between the first radio frequency unit and the baseband unit is normal and the link between the second radio frequency unit and the baseband unit is broken, The intermediate frequency backup unit is further used to restore the uplink baseband signal sent by the second radio frequency unit from the uplink backup intermediate frequency signal received from the other intermediate frequency backup units, and send the uplink baseband signal to the baseband unit; The uplink backup intermediate frequency signal is generated by the other intermediate frequency backup unit according to the uplink baseband signal.

3. The intermediate frequency backup unit according to claim 2, It is characterized in that In the case where the link between the first radio frequency unit and the baseband unit is normal and the link between the second radio frequency unit and the baseband unit is broken, The splitter-combiner network is used to forward the uplink backup intermediate frequency signal to the analog intermediate frequency processing module; The analog intermediate frequency processing module is used to convert the uplink backup intermediate frequency signal into a first uplink digital intermediate frequency signal, and send the first uplink digital intermediate frequency signal to the baseband processing module; The baseband processing module is used to process the first uplink digital intermediate frequency signal to obtain the uplink baseband signal, and send the uplink baseband signal to the baseband unit.

4. The intermediate frequency backup unit according to claim 3, It is characterized in that The baseband processing module is further configured to combine the uplink baseband signal with the uplink signal obtained by the first radio frequency unit, and send the combined signal to the baseband unit.

5. The intermediate frequency backup unit according to claim 2, It is characterized in that In the case where the link between the first radio frequency unit and the baseband unit is broken, the baseband processing module is used to process the uplink baseband signal to obtain a second uplink digital intermediate frequency signal, and send the second uplink digital intermediate frequency signal to the analog intermediate frequency processing module; The analog intermediate frequency processing module is used to convert the second uplink digital intermediate frequency signal into the uplink backup intermediate frequency signal, and send the uplink backup intermediate frequency signal through the splitter-combiner network.

6. The intermediate frequency backup unit according to claim 2, It is characterized in that In the case where the link between the first RF unit and the baseband unit is normal and the link between the second RF unit and the baseband unit is broken, the baseband processing module is used to extract the system synchronization signal, the clock signal and the second downlink digital intermediate frequency signal from the downlink baseband signal received from the second RF unit, and send the second downlink digital intermediate frequency signal to the analog intermediate frequency processing module, and send the system synchronization signal and the clock signal to the splitter-combiner network; The analog intermediate frequency processing module is used to convert the second downlink digital intermediate frequency signal into a downlink analog intermediate frequency signal, and send the downlink analog intermediate frequency signal to the splitter-combiner network; The splitter-combiner network is used to combine the system synchronization signal, the clock signal and the downlink analog intermediate frequency signal to obtain the downlink backup intermediate frequency signal.

7. The intermediate frequency backup unit according to claim 6, It is characterized in that The intermediate frequency backup unit also includes a clock processing unit; the clock processing unit is respectively connected to the baseband processing module and the splitter-combiner network; When the link between the first radio frequency unit and the baseband unit is normal and the link between the second radio frequency unit and the baseband unit is broken, sending the system clock signal extracted by the baseband processing module to the split-and-combine network; In the case where the link between the first radio frequency unit and the baseband unit is broken, the system clock signal is set as a reference clock of the intermediate frequency backup unit.

8. The intermediate frequency backup unit according to any one of claims 1 to 7, It is characterized in that The splitter-combiner network is connected to multiple channels of the first radio frequency unit through multiple ports.

9. The intermediate frequency backup unit according to any one of claims 1 to 7, It is characterized in that The intermediate frequency backup unit also includes a monitoring unit; the monitoring unit is respectively connected to the baseband processing module and the splitter-combiner network, and is used to realize monitoring communication between the intermediate frequency backup unit and the other intermediate frequency backup units, and / or between the intermediate frequency backup unit and the first radio frequency unit.

10. The intermediate frequency backup unit according to claim 1, It is characterized in that The intermediate frequency backup unit is connected to the optical port of the first radio frequency unit; the intermediate frequency backup unit also includes a photoelectric conversion unit.

11. An intermediate frequency backup communication system, It is characterized in that The intermediate frequency backup communication system includes a baseband unit, a first radio frequency unit, a second radio frequency unit, a first intermediate frequency backup unit, a second intermediate frequency backup unit, a first combining unit and a second combining unit; the baseband unit is connected to the first radio frequency unit and the second radio frequency unit; the first radio frequency unit, the first intermediate frequency backup unit and the first combining unit are connected to each other; the second radio frequency unit, the second intermediate frequency backup unit and the second combining unit are connected to each other; When the link between the first radio frequency unit and the baseband unit is broken and the link between the second radio frequency unit and the baseband unit is normal, The second intermediate frequency backup unit is used to generate a downlink backup intermediate frequency signal according to the downlink baseband signal sent by the baseband unit; the first combining unit is used to combine the downlink backup intermediate frequency signal and the downlink radio frequency signal sent by the second radio frequency unit and then send them; The first intermediate frequency backup unit is used to receive the downlink backup intermediate frequency signal through the first combiner unit; restore the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal, and send the downlink baseband signal to the first radio frequency unit; Among them, the first intermediate frequency backup unit includes: a first baseband processing module, a first analog intermediate frequency processing module and a first splitter-combiner network connected in sequence; when the link between the first radio frequency unit and the baseband unit is broken, the first splitter-combiner network is used to forward the received downlink backup intermediate frequency signal to the first analog intermediate frequency processing module; the first analog intermediate frequency processing module is used to convert the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal, and send the first downlink digital intermediate frequency signal to the baseband processing module; the baseband processing module is used to process the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal includes downlink data, a synchronization signal and a system clock signal; and the downlink baseband signal is sent to the first radio frequency unit.

12. A medium frequency backup method, It is characterized in that The method is applied to an intermediate frequency backup unit, the intermediate frequency backup unit is connected to a first radio frequency unit in a base station, and the first radio frequency unit is connected to a baseband unit in the base station; The intermediate frequency backup unit includes: a baseband processing module, an analog intermediate frequency processing module and a splitter / combiner network connected in sequence; the method includes: In the case where the link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit will recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit; Wherein, the downlink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the downlink baseband signal; the other intermediate frequency backup units are connected to the baseband unit through the second radio frequency unit in the base station; The intermediate frequency backup unit will recover the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal received from other backup intermediate frequency devices, and send the downlink baseband signal to the first radio frequency unit, including: The splitter-combiner network is used to forward the received downlink backup intermediate frequency signal to the analog intermediate frequency processing module; the analog intermediate frequency processing module is used to convert the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal, and send the first downlink digital intermediate frequency signal to the baseband processing module; the baseband processing module is used to process the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal includes downlink data, a synchronization signal and a system clock signal; and the downlink baseband signal is sent to the first radio frequency unit.

13. The intermediate frequency backup method according to claim 12, It is characterized in that The method further comprises: The intermediate frequency backup unit will recover the uplink baseband signal sent by the second radio frequency unit from the uplink backup intermediate frequency signal received from the other intermediate frequency backup units, and send the uplink baseband signal to the baseband unit; The uplink backup intermediate frequency signal is generated by the other intermediate frequency backup unit according to the uplink baseband signal.

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