CN212278216U - Intermediate frequency backup communication system - Google Patents
Intermediate frequency backup communication system Download PDFInfo
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- CN212278216U CN212278216U CN201922338576.XU CN201922338576U CN212278216U CN 212278216 U CN212278216 U CN 212278216U CN 201922338576 U CN201922338576 U CN 201922338576U CN 212278216 U CN212278216 U CN 212278216U
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Abstract
The application relates to an intermediate frequency backup communication system, wherein an intermediate frequency backup unit is connected with a first radio frequency unit in a base station, and the first radio frequency unit is connected with a baseband unit in the base station; under the condition that a link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used for recovering downlink baseband signals sent by the baseband unit from downlink backup intermediate frequency signals received from other backup intermediate frequency devices and sending the downlink baseband signals to the first radio frequency unit; the downlink backup intermediate-frequency signal is generated by other intermediate-frequency backup units according to the downlink baseband signal; and other intermediate frequency backup units are connected with the baseband unit through a second radio frequency unit in the base station. The intermediate frequency backup unit can reestablish the connection between the first radio frequency unit and the baseband unit through the intermediate frequency backup unit under the condition that the link between the first radio frequency unit and the baseband unit is broken, thereby ensuring the integrity of data and improving the reliability of the system.
Description
Technical Field
The present application relates to the field of communications technologies, and in particular, to an intermediate frequency backup communication system.
Background
With the rapid development of high-speed mobile network construction, a Remote Radio Unit (RRU for short) becomes an important component in a railway and tunnel mobile communication network. In an actual communication network, a baseband unit sends a baseband signal to an RRU through an optical fiber, and the RRU converts the baseband signal into a radio frequency signal and then realizes coverage. Due to the particularity of the railway or tunnel mobile communication, the overlay system in the network must be provided with a backup technology to improve the reliability of the mobile network communication.
In the traditional technology, railway movement, especially RRU in a subway tunnel communication network, can adopt a module backup mode, such as power supply backup; when a power module in the RRU breaks down, signal transmission is continuously realized by switching to a backup power supply.
However, when the transmission fiber between the RRU and the baseband unit fails, the connection with the baseband device cannot be established and signal coverage cannot be completed through the backup module, resulting in poor system reliability.
SUMMERY OF THE UTILITY MODEL
In view of the above, it is necessary to provide an intermediate frequency backup communication system.
An intermediate frequency backup unit is connected with a first radio frequency unit in a base station where the intermediate frequency backup unit is located, and the first radio frequency unit is connected with a baseband unit in the base station;
under the condition that a link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used for recovering downlink baseband signals sent by the baseband unit from downlink backup intermediate frequency signals received from other backup intermediate frequency devices and sending the downlink baseband signals to the first radio frequency unit;
the downlink backup intermediate-frequency signal is generated by other intermediate-frequency backup units according to the downlink baseband signal; and other intermediate frequency backup units are connected with the baseband unit through a second radio frequency unit in the base station.
In one embodiment, in the case that 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 intermediate frequency backup unit is also used for recovering the uplink baseband signals sent by the second radio frequency unit from the uplink backup intermediate frequency signals received from other intermediate frequency backup units and sending the uplink baseband signals to the baseband unit;
the uplink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the uplink baseband signal.
In one embodiment, the intermediate frequency backup unit includes: the device comprises a baseband processing module, an analog intermediate frequency processing module and a branching and combining network which are connected in sequence;
in case of a link break between the first radio unit and the baseband unit,
the switching network is used for forwarding the received downlink backup intermediate-frequency signal to the analog intermediate-frequency processing module;
the analog intermediate frequency processing module is used for converting the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal and sending the first downlink digital intermediate frequency signal to the baseband processing module;
the baseband processing module is used for processing the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal comprises downlink data, a synchronous signal and a system clock signal; and sending the downlink baseband signal to the first radio frequency unit.
In one embodiment, in the case that 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 branch circuit network is used for forwarding the uplink backup intermediate frequency signal to the analog intermediate frequency processing module;
the analog intermediate frequency processing module is used for converting the uplink backup intermediate frequency signal into a first uplink digital intermediate frequency signal and sending the first uplink digital intermediate frequency signal to the baseband processing module;
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.
In one embodiment, the baseband processing module is further configured to combine the uplink baseband signal with an uplink signal obtained by the first radio frequency unit, and send the combined signal to the baseband unit.
In one embodiment, in the case that the link between the first radio frequency unit and the baseband unit is broken, the baseband processing module is configured 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 for converting the second uplink digital intermediate frequency signal into an uplink backup intermediate frequency signal and sending the uplink backup intermediate frequency signal through the splitting and combining network.
In one embodiment, in the case that 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 baseband processing unit is configured 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 radio frequency unit, send the second downlink digital intermediate frequency signal to the analog intermediate frequency processing module, and combine the system synchronization signal and the clock signal sending values into the combiner network;
the analog intermediate frequency processing module is used for converting the second downlink digital intermediate frequency signal into a downlink analog intermediate frequency signal and sending the downlink analog intermediate frequency signal to the branching and combining network;
the combining and combining network is used for combining the system synchronization signal, the clock signal and the downlink analog intermediate frequency signal to obtain a downlink backup intermediate frequency signal.
In one embodiment, the intermediate frequency backup unit further includes a clock processing unit; the clock processing unit is respectively connected with the baseband processing module and the branch and branch network;
under the condition that a link between the first radio frequency unit and the baseband unit is normal and a link between the second radio frequency unit and the baseband unit is broken, sending a system clock signal extracted by the baseband processing module to the branching and combining network;
and in the case of link breakage between the first radio frequency unit and the baseband unit, setting a system clock signal as a reference clock of the intermediate frequency backup unit.
In one embodiment, the combining network is connected to the plurality of channels of the first rf unit through a plurality of ports, respectively.
In one embodiment, the intermediate frequency backup unit further includes a monitoring unit; the monitoring unit is respectively connected with the baseband processing module and the branching and connecting network and is used for realizing 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.
In one embodiment, the intermediate frequency backup unit is connected to an optical port of the first radio frequency unit; the intermediate frequency backup unit further comprises a photoelectric conversion unit.
An intermediate frequency backup communication system comprises 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 combiner unit and a second combiner unit; the baseband unit is connected with 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 combiner unit are connected with each other; the second radio frequency unit, the second intermediate frequency backup unit and the second combiner unit are connected with each other;
in the case that 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 for generating a downlink backup intermediate frequency signal according to the downlink baseband signal sent by the baseband unit; the first combining unit is used for combining the downlink backup intermediate frequency signal and the downlink radio frequency signal sent by the second radio frequency unit and then sending the combined signal;
the first intermediate frequency backup unit is used for receiving the downlink backup intermediate frequency signal through the first combining unit; and recovering the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal, and sending the downlink baseband signal to the first radio frequency unit.
In one embodiment, the first intermediate frequency backup unit is further configured 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;
the second intermediate frequency backup unit is also used for receiving the uplink backup intermediate frequency signal through the second combiner unit; and recovering the uplink baseband signal sent by the first radio frequency unit from the uplink backup intermediate frequency signal, and sending the uplink baseband signal to the baseband unit.
An intermediate frequency backup method is applied to an intermediate frequency backup unit, the intermediate frequency backup unit is connected with a first radio frequency unit in a base station, and the first radio frequency unit is connected with a baseband unit in the base station; the method comprises the following steps:
under the condition that a link between a first radio frequency unit and a baseband unit is broken, an intermediate frequency backup unit recovers downlink baseband signals sent by the baseband unit from downlink backup intermediate frequency signals received from other backup intermediate frequency devices and sends the downlink baseband signals to the first radio frequency unit; the downlink backup intermediate-frequency signal is generated by other intermediate-frequency backup units according to the downlink baseband signal; and other intermediate frequency backup units are connected with the baseband unit through a second radio frequency unit in the base station.
In one embodiment, the method further includes: the intermediate frequency backup unit recovers the uplink baseband signal sent by the second radio frequency unit from the uplink backup intermediate frequency signals received from other intermediate frequency backup units and sends the uplink baseband signal to the baseband unit; the uplink backup intermediate frequency signal is generated by other intermediate frequency backup units according to the uplink baseband signal.
In the intermediate frequency backup communication system, the intermediate frequency backup unit is connected with a first radio frequency unit in a base station where the intermediate frequency backup unit is located, and the first radio frequency unit is connected with a baseband unit in the base station; under the condition that a link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used for recovering downlink baseband signals sent by the baseband unit from downlink backup intermediate frequency signals received from other backup intermediate frequency devices and sending the downlink baseband signals to the first radio frequency unit; the downlink backup intermediate-frequency signal is generated by other intermediate-frequency backup units according to the downlink baseband signal; and other intermediate frequency backup units are connected with the baseband unit through a second radio frequency unit in the base station. Because other intermediate frequency backup units generate downlink backup intermediate frequency signals according to the downlink baseband signals, the intermediate frequency backup units can recover the downlink baseband signals from the downlink backup intermediate frequency signals; furthermore, the intermediate frequency backup unit sends the downlink baseband signal to the first radio frequency unit, so that the first radio frequency unit and the baseband unit can be reestablished to be connected through the intermediate frequency backup unit under the condition that the link of the first radio frequency unit and the link of the baseband unit are broken, the data integrity is guaranteed, and the reliability of the system is improved.
Drawings
FIG. 1 is a diagram of an exemplary implementation of an application environment of an intermediate frequency backup unit;
FIG. 2 is a schematic diagram of the connection of an intermediate frequency backup unit in one embodiment;
FIG. 3 is a schematic diagram of the connection of the intermediate frequency backup unit in another embodiment;
FIG. 4 is a block diagram of an intermediate frequency backup unit in another embodiment;
FIG. 5 is a block diagram of an intermediate frequency backup unit in another embodiment;
FIG. 6 is a block diagram of an intermediate frequency backup unit in another embodiment;
FIG. 7 is a block diagram of an intermediate frequency backup unit in another embodiment;
FIG. 8 is a block diagram of an intermediate frequency backup unit in another embodiment;
fig. 9 is a block diagram of an intermediate frequency backup communication system in one embodiment.
Description of reference numerals:
10. an intermediate frequency backup unit; 20. a radio frequency unit; 30. a baseband unit;
40. a user equipment; 11. other intermediate frequency backup units; 21. a first radio frequency unit;
22. a second radio frequency unit; 101. a baseband processing module; 102. an analog intermediate frequency processing module;
103. a branching network; 50. a combining unit; 104. a clock processing unit;
105. a monitoring unit; 106. a photoelectric conversion unit; 12. a first intermediate frequency backup unit;
13. a second intermediate frequency backup unit; 41. a first combining unit; 42. and a second combining unit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The intermediate frequency backup unit provided by the application can be applied to the application environment shown in fig. 1. The intermediate frequency backup unit 10 is in communication connection with a radio frequency unit 20 in the base station, and the radio frequency unit 20 is in communication connection with a baseband unit 30; the radio unit 20 is communicatively connected to 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, an unmanned aerial vehicle, an industrial device, and other devices having a radio frequency transmitting/receiving function; the systems that the base station can support include: other systems such as a Long Term Evolution (Long Term Evolution, abbreviated as LTE) System, a Wideband Multiple Access (WCDMA) System, a Global System for Mobile communication (GSM) System, a World Interoperability for Microwave Access (WiMax) System, a Code Division Multiple Access (CDMA) System, and a fifth Generation Mobile communication technology (5th-Generation, abbreviated as 5G).
In one embodiment, as shown in fig. 2, an if backup unit 10 is provided, the if backup unit 10 is connected to a first rf unit 21 in a base station, and the first rf unit 21 is connected to a baseband unit 30 in the base station.
In the case of a link between the first radio frequency unit 21 and the baseband unit 30 being broken, the if backup unit 10 is configured to recover the downlink baseband signal sent by the baseband unit 30 from the downlink backup if signals received from the other backup if devices 11, and send the downlink baseband signal to the first radio frequency unit 21. The downlink backup intermediate frequency signal is generated by the other intermediate frequency backup units 11 according to the downlink baseband signal; the other if backup unit 11 is connected to the baseband unit 30 through the second rf unit 22 in the base station.
The baseband unit 30 mainly implements baseband protocol processing. The baseband Unit 30 may be a baseband Unit (Base band Unit, BBU for short) in an LTE Base station, a WCDMA Base station, a 5G Base station, or a WiMax Base station, or may also be a Distributed Unit (DU for short) in a 5G Base station; the type of the baseband unit 30 is not limited herein.
The first rf unit 21 and the second rf unit 22 are connected to the same baseband unit 30, and are mainly used for implementing the conversion between baseband signals and rf signals and the transceiving processing function of rf signals. For example, in the downlink direction, the first rf unit 21 and the second rf unit 22 may receive a baseband signal transmitted from the baseband unit 30, and transmit the baseband signal through the switch and the antenna unit after performing up-conversion, digital-to-analog conversion, rf modulation, filtering, signal amplification, and other transmit chain processes. In the uplink direction, the first rf unit 21 and the second rf unit 22 may receive the rf signal sent by the user equipment through the antenna unit, perform receiving link processing such as low noise amplification, filtering, and demodulation, perform analog-to-digital conversion and down-conversion to obtain a baseband signal, and send the baseband signal to the baseband unit 30.
The first radio frequency unit 21 and the second radio frequency unit 22 may be RRUs in an LTE base station, a WCDMA base station, a 5G base station, or a WiMax base station, or may also be AAUs in a 5G base station, where the AAUs integrate a radio frequency unit and an antenna unit; in addition, the radio frequency unit may also be a micro base station radio frequency unit, and the types of the first radio frequency unit 21 and the second radio frequency unit 22 are not limited herein.
The intermediate frequency backup unit 10 is configured to implement conversion between a baseband signal and an intermediate frequency signal, and may convert a downlink backup intermediate frequency signal into the baseband signal, or generate the downlink backup intermediate frequency signal according to the downlink baseband signal.
The base band unit 30 of the base station may be connected to a plurality of radio frequency units, and the radio frequency units may be respectively connected to the corresponding intermediate frequency backup units 10, or some of the radio frequency units may be connected to the corresponding intermediate frequency backup units 10, which is not limited herein.
Each if backup unit in the base station system may be in a default receiving state, and in a case that a link between the first rf unit 21 and the baseband unit 30 is broken, the baseband unit 30 may determine one of the rf units adjacent to the first rf unit 21 and the second rf unit 22, and then control other if backup devices 11 connected to the second rf unit 22 to broadcast downlink backup if signals.
When the other intermediate frequency backup device 11 generates the downlink backup intermediate frequency signal according to the downlink baseband signal, the intermediate frequency of the downlink backup intermediate frequency signal may be an intermediate frequency in the process of converting the downlink baseband signal into the downlink radio frequency signal in the first radio frequency unit 21, or may be another intermediate frequency, which is not limited herein.
After receiving the downlink backup intermediate frequency signal through the antenna, the intermediate frequency backup unit 10 may establish a connection with the baseband unit 30 according to the downlink backup intermediate frequency signal, for example, may implement clock synchronization and transmission timing synchronization with the baseband unit. After the intermediate frequency backup unit 10 establishes 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 connection with the baseband unit 30. The first rf unit 21 receives the downlink baseband signal sent by the baseband unit 30 through the intermediate frequency backup unit 10, processes the downlink baseband signal to obtain a downlink rf signal, and then sends the downlink rf signal through an antenna to implement signal coverage.
The intermediate frequency backup unit 10 may be powered by the first radio frequency unit 10, and is connected to the power module of the first radio frequency unit 10 through a dc power supply port.
The intermediate frequency backup unit 10 is an independent network element, and when system backup in the base station system is realized, a worker can flexibly select the radio frequency unit 20 to be backed up to configure the intermediate frequency backup unit; when the intermediate frequency backup unit 10 is configured for the radio frequency unit 20, the existing transmission network does not need to be damaged, and other backup resources, such as power amplifier backup or power supply backup, do not need to be added, so that the cost of system backup is reduced. In addition, the downlink backup intermediate frequency signal has the characteristics of small insertion loss, long propagation distance and the like, so that the signal amplitude of the downlink backup intermediate frequency signal can be effectively controlled; because the frequency of the downlink backup intermediate frequency signal is far apart from the frequency 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.
The intermediate frequency backup unit is connected with a first radio frequency unit in the base station, and the first radio frequency unit is connected with a baseband unit in the base station; under the condition that a link between the first radio frequency unit and the baseband unit is broken, the intermediate frequency backup unit is used for recovering downlink baseband signals sent by the baseband unit from downlink backup intermediate frequency signals received from other backup intermediate frequency devices and sending the downlink baseband signals to the first radio frequency unit; the downlink backup intermediate-frequency signal is generated by other intermediate-frequency backup units according to the downlink baseband signal; and other intermediate frequency backup units are connected with the baseband unit through a second radio frequency unit in the base station. Because other intermediate frequency backup units generate downlink backup intermediate frequency signals according to the downlink baseband signals, the intermediate frequency backup units can recover the downlink baseband signals from the downlink backup intermediate frequency signals; furthermore, the intermediate frequency backup unit sends the downlink baseband signal to the first radio frequency unit, so that the first radio frequency unit and the baseband unit can be reestablished to be connected through the intermediate frequency backup unit under the condition that the link of the first radio frequency unit and the link of the baseband unit are broken, the data integrity is guaranteed, and the reliability of the system is improved.
In one embodiment, the intermediate frequency backup unit 10 is involved in data connection with other equipment units during the uplink process. On the basis of the foregoing embodiment, as shown in fig. 3, in the case that 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 if backup unit 10 is further configured to recover the uplink baseband signal sent by the second rf unit 22 from the uplink backup if signals received from the other if backup units 11, and send the uplink baseband signal to the baseband unit 30; the uplink backup intermediate frequency signal is generated by the other intermediate frequency backup unit 11 according to the uplink baseband signal.
In case that 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 may instruct the if backup unit 10 connected to the first rf unit 21 to broadcast the downlink backup if signal according to the principles of the above-mentioned embodiments. After establishing the connection with the baseband unit 30 based on the downlink backup intermediate frequency signal, the second rf unit 22 may send the uplink baseband signal to the baseband unit 30 based on the connection.
Specifically, the second rf unit 22 may convert the uplink rf signal into an uplink baseband signal after receiving the uplink rf signal sent by the user equipment. Then, the second rf unit 22 may send the uplink baseband signal to another intermediate frequency backup unit 11, so that the other intermediate frequency backup unit 11 may generate an uplink backup intermediate frequency signal according to the uplink baseband signal, and broadcast and send the uplink backup intermediate frequency signal.
The baseband unit 30 may instruct the if backup unit 10 to receive the uplink backup if signal, recover the uplink baseband signal from the backup if signal, and send the uplink baseband signal to the baseband unit 30 through the first rf unit 21. Specifically, the intermediate frequency backup unit 10 may separately return the uplink baseband signal sent by the second radio frequency unit 22 to the baseband unit through the first radio frequency unit 21, or may combine the uplink baseband signal with a 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 herein.
When the other intermediate frequency backup device 11 generates an uplink backup intermediate frequency signal according to the uplink baseband signal, the intermediate frequency of the 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 the base station system in the TDD mode, the frequency of the downlink backup intermediate frequency signal may be the same as the intermediate frequency of the uplink backup intermediate frequency signal.
After receiving the uplink baseband signal, the baseband unit 30 may process the baseband signal, thereby effectively ensuring the data integrity of the user equipment accessing the second radio frequency unit 22.
The intermediate frequency backup unit converts the uplink baseband signal of the second radio frequency unit 22 into the uplink backup intermediate frequency signal, and after recovering the uplink baseband signal from the uplink backup intermediate frequency signal, 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 conducted, and the data integrity of the user equipment is ensured.
Fig. 4 is a schematic diagram of a connection of an intermediate frequency backup unit in another embodiment, the present embodiment relates to the intermediate frequency backup unit 10 in a case of a link broken between a first radio frequency unit and a baseband unit, and based on the above embodiment, as shown in fig. 4, the intermediate frequency backup unit 10 includes: a baseband processing module 101, an analog intermediate frequency processing module 102, and a branching network 103 connected in sequence.
In the downlink process, the splitting and combining network 103 is configured 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 configured 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 configured to process the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal comprises downlink data, a synchronous signal and a system clock signal; and sends the downlink baseband signal to the first rf unit 21.
The analog intermediate frequency processing module 102 may amplify and convert the received downlink backup intermediate frequency signal, and then convert the amplified downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal through the radio frequency conversion chip; the analog if processing module 102 may include 1 receiving channel, or may include a plurality of receiving channels, where the number of the receiving channels is related to the number of the rf conversion chips and the number of the receiving channels.
The baseband processing module 101 extracts a synchronization signal and a system clock signal from the first downlink digital intermediate frequency signal, and obtains downlink data. The synchronization signal is used to achieve synchronization of the transceiving timings between the first rf unit 21 and the if backup unit 10 and the baseband unit 30. The system clock signal is used to achieve frequency synchronization between the first rf unit 21 and the if backup unit 10 and the baseband unit 30. For example, the intermediate frequency backup unit 10 may perform power division processing on the system clock signal, divide the system clock signal into a plurality of branches, and respectively send the branches to the phase-locked loop circuit, the FPGA circuit, and the radio frequency conversion chip as a reference clock.
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 downlink radio frequency signal, so as to implement signal coverage.
Specifically, the first radio frequency unit 21 may extract a synchronization signal and a system clock signal at a start time domain position of a received 10 ms frame, obtain an uplink and downlink timeslot proportion, a special subframe configuration, an uplink and downlink switch switching signal, and the like in the synchronization signal, and set the received system clock signal as a reference clock of the first radio frequency.
In the uplink process, the baseband processing module 101 is configured to process an 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 configured 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 splitting/combining network 103.
The processing of the uplink baseband signal by the baseband processing module 101 may include a variable-multiple extraction link, for example, for different carrier bandwidths corresponding to different extraction magnifications, the initial sampling rates are all 30.72 Msps; the system also comprises a gain control link for compensating the transmission loss of the leaky cable signal.
Fig. 5 is a schematic diagram of a connection of an if backup unit in another embodiment, where the embodiment relates to the if backup unit 10 connected to the first rf unit in a case where a link between the first rf unit 21 and the baseband unit 30 is normal and a link between the second rf unit 22 and the baseband unit 30 is broken, on the basis of the above embodiment, as shown in fig. 5. In the uplink process, the splitting and combining network 103 is configured to forward the uplink backup intermediate frequency signal to the analog intermediate frequency processing module 102; the analog intermediate frequency processing module 102 is configured 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 configured to process the first uplink digital intermediate frequency signal to obtain an uplink baseband signal, and send the uplink baseband signal to the baseband unit 30.
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 is sent to the baseband unit.
In the downlink process, the baseband processing unit 101 is configured to extract a system synchronization signal, a clock signal, and a second downlink digital intermediate frequency signal from the downlink baseband signal received from the first radio frequency unit 21, send the second downlink digital intermediate frequency signal to the analog intermediate frequency processing module 102, and combine the system synchronization signal and the sending value of the clock signal into the combiner network 103. The system synchronization signal and the clock signal can be modulated in an FSK modulation mode.
The analog intermediate frequency processing module 102 is configured 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 combining network 103.
The combining network 103 is configured to combine the system synchronization signal, the clock signal, and the downlink analog intermediate frequency signal to obtain a downlink backup intermediate frequency signal.
After obtaining the downlink backup intermediate frequency signal, the combining network 103 may send the downlink backup intermediate frequency signal to the antenna unit, and send the downlink backup intermediate frequency signal through antenna broadcasting.
Specifically, the combining network 103 may send the downlink backup intermediate frequency signal to the combining unit 50, and send the downlink backup intermediate frequency signal to the antenna port after combining the downlink backup intermediate frequency signal with the downlink radio frequency signal sent by the first radio frequency unit 21 through the combining unit 50.
The combining network 103 may combine the downlink backup intermediate frequency signal with the downlink radio frequency signal sent by one of the channels of the first radio frequency unit 21 through the combining unit 50, and optionally, the combining network 103 may be connected to the multiple channels of the first radio frequency unit through multiple ports 1031, respectively. For example, when the first rf unit 21 includes 4 channels, the combining network 103 may output 4 downlink backup intermediate frequency signals through a plurality of ports, and respectively combine the downlink backup intermediate frequency signals with the downlink rf signals output by the 4 channels.
The combiner unit 50 may include an intermediate frequency filter and a radio frequency filter, and respectively filter the downlink backup intermediate frequency signal and the downlink radio frequency signal, and then transmit the combined signal to the antenna port.
The intermediate frequency backup unit comprises a baseband processing module, an analog intermediate frequency processing module and a branching network, so that the intermediate frequency backup unit can realize conversion between the baseband signal and the intermediate frequency backup signal under the condition that a link between the first radio frequency unit and the baseband unit is broken, and normal data transmission between the first radio frequency unit and the baseband unit is ensured.
In an embodiment, as shown in fig. 6, on the basis of the above embodiment, the intermediate frequency backup unit further includes a clock processing unit 104; the clock processing unit 104 is respectively connected with the baseband processing module 101 and the branching and combining network 103; under the condition that 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, sending the system clock signal extracted by the baseband processing module 101 to the splitting/combining network 103; in case of a link broken between the first radio frequency unit 21 and the baseband unit 30, the system clock signal is set to the reference clock of the intermediate frequency backup unit 10.
The intermediate frequency backup unit comprises a clock processing unit, clock synchronization can be realized through clock switching, and smooth data transmission between the first radio frequency unit and the baseband unit is guaranteed.
In an embodiment, as shown in fig. 7, on the basis of the above embodiment, the intermediate frequency backup unit 21 further includes a monitoring unit 105; the monitoring unit 105 is connected to the baseband processing module 101 and the switching network 103, respectively, and is configured to implement monitoring communication between the intermediate frequency backup unit 10 and another intermediate frequency backup unit 11, and/or between the intermediate frequency backup unit 10 and the first radio frequency unit 21.
The monitoring communication may include the intermediate frequency backup unit 10 reporting the monitoring state to the first radio frequency unit 21, or the first radio frequency unit 21 sending a switch control instruction and an alarm to the intermediate frequency backup unit 10, and the type of the monitoring communication is not limited herein.
In an embodiment, as shown in fig. 8, on the basis of the above embodiment, the intermediate frequency backup unit 10 is connected to the optical port of the first rf unit 21; the intermediate frequency backup unit 10 further includes a photoelectric conversion unit 106. The photoelectric conversion unit 106 is used to perform photoelectric conversion of a baseband signal.
In one embodiment, an if backup communication system is provided, as shown in fig. 9, the if backup communication system includes a baseband unit 30, a first rf unit 21, a second rf unit 22, a first if backup unit 12, a second if backup unit 13, a first combining unit 41, and a second combining unit 42; the baseband unit 30 is connected with 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 combining unit 41 are connected to each other; the second radio frequency unit 22, the second intermediate frequency backup unit 12 and the second combining unit 42 are connected to each other; the second if backup unit 12 is configured to generate a downlink backup if signal according to the downlink baseband signal sent by the baseband unit 30, when the link between the first rf unit 21 and the baseband unit 30 is broken and the link between the second rf unit 22 and the baseband unit 30 is normal; the first combining unit 51 is configured to combine the downlink backup intermediate frequency signal and the downlink radio frequency signal sent by the second radio frequency unit and send the combined signal; the first intermediate frequency backup unit 11 is configured to receive the downlink backup intermediate frequency signal through the first combining unit 51, recover the downlink baseband signal sent by the baseband unit 30 from the downlink backup intermediate frequency signal, and send the downlink baseband signal to the first radio frequency unit 21.
In an embodiment, on the basis of the above embodiment, the first intermediate frequency backup unit 11 is further configured 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 further configured to receive the uplink backup intermediate frequency signal through the second combiner unit 52; the uplink backup intermediate frequency signal recovers the uplink baseband signal sent by the first radio frequency unit 21, and sends the uplink baseband signal to the baseband unit 30.
The implementation principle and technical effect of the if backup communication system provided in this embodiment are similar to those of the above embodiment of the if backup unit, and are not described herein again.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (11)
1. An intermediate frequency backup communication system is characterized by 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 combiner unit and a second combiner unit; the baseband unit is connected with 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 combiner unit are connected with each other; the second radio frequency unit, the second intermediate frequency backup unit and the second combiner unit are connected with each other;
under the condition that 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 for generating a downlink backup intermediate frequency signal according to the downlink baseband signal sent by the baseband unit; the first combining unit is used for combining the downlink backup intermediate frequency signal and the downlink radio frequency signal sent by the second radio frequency unit and then sending the combined signal;
the first intermediate frequency backup unit is used for receiving the downlink backup intermediate frequency signal through the first combiner unit; and recovering the downlink baseband signal sent by the baseband unit from the downlink backup intermediate frequency signal, and sending the downlink baseband signal to the first radio frequency unit.
2. The intermediate frequency backup communication system according to claim 1,
the first intermediate frequency backup unit is further configured 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;
the second intermediate frequency backup unit is further configured to receive the uplink backup intermediate frequency signal through the second combiner unit; and recovering the uplink baseband signal sent by the first radio frequency unit from the uplink backup intermediate frequency signal, and sending the uplink baseband signal to the baseband unit.
3. The if backup communication system of claim 2, wherein the first if backup unit comprises: the device comprises a baseband processing module, an analog intermediate frequency processing module and a branching and combining network which are connected in sequence;
in case of a link break between the first radio frequency unit and the baseband unit,
the switching network is used for forwarding the received downlink backup intermediate-frequency signal to the analog intermediate-frequency processing module;
the analog intermediate frequency processing module is used for converting the downlink backup intermediate frequency signal into a first downlink digital intermediate frequency signal and sending the first downlink digital intermediate frequency signal to the baseband processing module;
the baseband processing module is used for processing the first downlink digital intermediate frequency signal to obtain a downlink baseband signal; the downlink baseband signal comprises downlink data, a synchronous signal and a system clock signal; and sending the downlink baseband signal to the first radio frequency unit.
4. The IF backup communication system according to claim 3, wherein in case 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 branch circuit network is used for forwarding the uplink backup intermediate frequency signal to the analog intermediate frequency processing module;
the analog intermediate frequency processing module is used for converting the uplink backup intermediate frequency signal into a first uplink digital intermediate frequency signal and sending the first uplink digital intermediate frequency signal to the baseband processing module;
the baseband processing module is configured 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.
5. The if backup communication system according to claim 4, wherein 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.
6. The if backup communication system according to claim 3, wherein the baseband processing module is configured to process the uplink baseband signal to obtain a second uplink digital if signal and send the second uplink digital if signal to the analog if processing module when a link between the first rf unit and the baseband unit is broken;
the analog intermediate frequency processing module is used for converting the second uplink digital intermediate frequency signal into the uplink backup intermediate frequency signal and sending the uplink backup intermediate frequency signal through the branch circuit network.
7. The if backup communication system according to claim 3, wherein in a case that 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 configured to extract a system synchronization signal, a clock signal, and a second downlink digital if signal from the downlink baseband signal received by the second rf unit, send the second downlink digital if signal to the analog if processing module, and send the system synchronization signal and the clock signal to the splitting network;
the analog intermediate frequency processing module is used for converting the second downlink digital intermediate frequency signal into a downlink analog intermediate frequency signal and sending the downlink analog intermediate frequency signal to the branching and combining network;
the combining network is used for combining the system synchronization signal, the clock signal and the downlink analog intermediate frequency signal to obtain the downlink backup intermediate frequency signal.
8. The if backup communication system of claim 7, wherein the first if backup unit further comprises a clock processing unit; the clock processing unit is respectively connected with the baseband processing module and the branch-and-branch network;
under the condition that a link between the first radio frequency unit and the baseband unit is normal and a link between the second radio frequency unit and the baseband unit is broken, sending a system clock signal extracted by the baseband processing module to the branching and combining network;
and under the condition that a link between the first radio frequency unit and the baseband unit is broken, setting the system clock signal as a reference clock of the first intermediate frequency backup unit.
9. The if backup communication system according to any of claims 3-8, wherein the splitting network is connected to the plurality of channels of the first rf unit through a plurality of ports, respectively.
10. The if backup communication system according to any of claims 3-8, wherein the first if backup unit further comprises a monitoring unit; the monitoring unit is respectively connected with the baseband processing module and the branching and connecting network and is used for realizing monitoring communication between the first intermediate frequency backup unit and the second intermediate frequency backup unit and/or between the first intermediate frequency backup unit and the first radio frequency unit.
11. The if backup communication system of claim 1, wherein the first if backup unit is connected to the optical port of the first rf unit; the intermediate frequency backup unit further comprises a photoelectric conversion unit.
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| CN201922338576.XU CN212278216U (en) | 2019-12-23 | 2019-12-23 | Intermediate frequency backup communication system |
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| CN201922338576.XU CN212278216U (en) | 2019-12-23 | 2019-12-23 | Intermediate frequency backup communication system |
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Address after: 510663 Shenzhou Road 10, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangzhou, Guangdong Patentee after: Jingxin Network System Co.,Ltd. Address before: 510663 Shenzhou Road 10, Guangzhou Science City, Guangzhou economic and Technological Development Zone, Guangzhou, Guangdong Patentee before: Comba Telecom System (China) Ltd. |