CN117729627A - Method for realizing simultaneous synchronization of 4G signal and 5G signal of wireless repeater - Google Patents
Method for realizing simultaneous synchronization of 4G signal and 5G signal of wireless repeater Download PDFInfo
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Abstract
The invention belongs to the technical field of communication, and discloses a method for realizing synchronous 4G signals and 5G signals of a wireless repeater, wherein the wireless repeater comprises a 4G and 5G synchronous module, the 4G and 5G synchronous module comprises a first radio frequency switching circuit, a 4G downlink radio frequency link, a 5G downlink radio frequency link, a second radio frequency switching circuit and a digital processing module, and the method comprises the following steps: after the 5G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit are switched to a 5G downlink radio frequency link, and the digital processing module invokes a 5G synchronization algorithm to synchronize 5G signals, outputs 5G synchronization switching signals and keeps the 5G synchronization switching signals; after the 4G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit are switched to a 4G downlink radio frequency link, and the digital processing module calls a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal; repeating the above steps. The invention can reduce the equipment synchronization cost of simultaneous synchronization of 4G and 5G.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a method for realizing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater.
Background
In the current 5G mobile communication coverage, the application of a wireless repeater is one of the main solutions, the function of the wireless repeater is to receive signals of 4G and 5G base stations from outdoors, and after amplification, the wireless repeater covers a target scene through a coverage antenna, so that the problem that the coverage of the target scene is weak or no coverage is solved. In the 4G and 5G networks, TDD (Time Division Duplexing, time division duplex) communication systems are adopted for mobile, communication and telecommunication, the wireless repeater station transparently amplifies uplink signals and downlink signals of the base station, and the uplink signals and the downlink signals are required to be amplified respectively in time, so that time synchronization is required to be performed on the base station signals, the 4G synchronization module is used for synchronizing the 4G signals, the 5G synchronization module is used for synchronizing the 5G signals, and when the repeater station amplifies the 4G signals and the 5G signals simultaneously, two synchronization modules are required, so that the equipment cost is increased.
Disclosure of Invention
The invention mainly aims to provide a method for realizing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater, which aims to solve the technical problem that the prior repeater simultaneously amplifies the 4G signal and the 5G signal, needs two synchronization modules and increases equipment cost.
In order to achieve the above object, a first aspect of the present invention provides a method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater, where the wireless repeater includes a 4G and 5G simultaneous synchronization module, and the 4G and 5G simultaneous synchronization module includes a first radio frequency switching circuit, a 4G downlink radio frequency link, a 5G downlink radio frequency link, a second radio frequency switching circuit, and a digital processing module, and the method includes:
s1, after a wireless repeater is started, a connection between the 4G downlink radio frequency link and the digital processing module is established through the first radio frequency switching circuit and the second radio frequency switching circuit, and after a 4G signal sequentially passes through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal;
s2, after the 5G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 4G downlink radio frequency link and the digital processing module, and establish the connection between the 5G downlink radio frequency link and the digital processing module, and after a 5G signal sequentially passes through the first radio frequency switching circuit, the 5G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 5G synchronization algorithm to perform 5G signal synchronization, outputs a 5G synchronization switching signal and maintains the 5G synchronization switching signal;
s3, after the 4G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 5G downlink radio frequency link and the digital processing module, and establish the connection between the 4G downlink radio frequency link and the digital processing module, and after 4G signals sequentially pass through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enter the digital processing module, the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal;
s4, repeating the steps S2-S3.
Further, the digital processing module calls a 4G synchronization algorithm to perform 4G signal synchronization, and outputting a 4G synchronization switching signal specifically includes:
and the digital processing module sequentially performs AD conversion, OFDM demodulation, PSS correlation and SSS correlation on the received 4G signals to complete 4G signal synchronization and output a 4G synchronous switching signal.
Further, the step of the digital processing module calling a 5G synchronization algorithm to perform 5G signal synchronization and outputting a 5G synchronization switching signal includes:
the digital processing module sequentially performs AD conversion, OFDM demodulation, PSS correlation, SSS correlation, PBCH channel estimation, channel equalization, demodulation, descrambling, de-rate matching and decoding on the received 5G signals to complete 5G signal synchronization and output 5G synchronous switching signals.
Further, after the step of establishing the connection between the 4G downlink radio frequency link and the digital processing module by the first radio frequency switching circuit and the second radio frequency switching circuit, the method further includes:
starting timing, and judging that the 5G switching time is reached after the preset first time length is reached;
after the steps of disconnecting the 4G downlink rf link from the digital processing module and establishing a connection between the 5G downlink rf link and the digital processing module, the method further includes:
restarting timing, and judging that the 4G switching time is reached after the preset second time length is reached;
after the step of establishing the connection between the 4G downlink radio frequency link and the digital processing module, the method further comprises:
the timing is restarted, and after the preset first time length is reached, the 5G switching time is judged to be reached.
Further, the step of maintaining the 4G synchronous switching signal includes:
when 4G signal synchronization is carried out, a set of parameters for adjusting crystal oscillator precision are obtained by a processor of the digital processing module through comparing a local clock with the 4G synchronous switching signal, and when the 4G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 4G synchronous switching signal, so that the 4G synchronous switching signal is kept.
Further, the step of maintaining the 5G synchronous switching signal includes:
when 5G signal synchronization is carried out, a group of parameters for adjusting crystal oscillator precision are obtained by a processor of the digital processing module through comparing a local clock with the 5G synchronous switching signal, and when the 5G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 5G synchronous switching signal, so that the 5G synchronous switching signal is kept.
Further, the 4G downlink radio frequency link comprises a first filter, a first low-noise amplifier, a first radio frequency attenuator and a first radio frequency amplifier which are sequentially connected, 4G signals sequentially enter the first filter to filter out-of-band signals, enter the first low-noise amplifier to carry out low-noise amplification, enter the first radio frequency attenuator to regulate power, and finally enter the first radio frequency amplifier to carry out power amplification.
Further, the 5G downlink radio frequency link comprises a second filter, a second low-noise amplifier, a second radio frequency attenuator and a second radio frequency amplifier which are sequentially connected, the 5G signal sequentially enters the second filter to filter out-of-band signals, enters the second low-noise amplifier to carry out low-noise amplification, enters the second radio frequency attenuator to regulate power, and finally enters the second radio frequency amplifier to carry out power amplification.
The embodiment of the application provides a method for implementing synchronous between a 4G signal and a 5G signal of a wireless repeater, the wireless repeater includes a 4G and 5G synchronous module, the 4G and 5G synchronous module includes a first radio frequency switching circuit, a 4G downlink radio frequency link, a 5G downlink radio frequency link, a second radio frequency switching circuit and a digital processing module, the method includes: s1, after a wireless repeater is started, a connection between the 4G downlink radio frequency link and the digital processing module is established through the first radio frequency switching circuit and the second radio frequency switching circuit, and after a 4G signal sequentially passes through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal; s2, after the 5G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 4G downlink radio frequency link and the digital processing module, and establish the connection between the 5G downlink radio frequency link and the digital processing module, and after a 5G signal sequentially passes through the first radio frequency switching circuit, the 5G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 5G synchronization algorithm to perform 5G signal synchronization, outputs a 5G synchronization switching signal and maintains the 5G synchronization switching signal; s3, after the 4G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 5G downlink radio frequency link and the digital processing module, and establish the connection between the 4G downlink radio frequency link and the digital processing module, and after 4G signals sequentially pass through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enter the digital processing module, the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal; s4, repeating the steps S2-S3, so that the wireless repeater can continuously transmit the 4G and 5G synchronous switching signals, and the wireless repeater can synchronously transmit the 4G and 5G signals. In addition, the above embodiment optimizes the synchronization algorithm and the synchronization switch time keeping by improving the access and the switching of the 4G and 5G signals, realizes that the 4G and 5G signals are synchronized simultaneously on one synchronization module, and compared with the prior art that two synchronization modules are needed for synchronizing the 4G and 5G signals simultaneously, the two synchronization modules are needed to mean that two digital processing modules are needed, and the 4G and 5G signals simultaneously require only one digital processing module, thereby reducing the equipment synchronization cost and improving the product competitiveness.
Drawings
Fig. 1 is a schematic structural diagram of a 4G and 5G simultaneous synchronization module according to an embodiment of the present application;
fig. 2 is a flowchart of a method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater according to an embodiment of the present application;
FIG. 3 is a schematic diagram of a prior art 4G synchronization module;
FIG. 4 is a schematic diagram of a conventional 5G synchronization module;
the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the present application.
As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, modules, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and/or groups thereof. It will be understood that when an element is referred to as being "connected" or "coupled" to another element, it can be directly connected or coupled to the other element or intervening elements may also be present. Further, "connected" or "coupled" as used herein may include wirelessly connected or wirelessly coupled. The term "and/or" as used herein includes all or any module and all combination of one or more of the associated listed items.
It will be understood by those skilled in the art that all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs unless defined otherwise. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
In order to facilitate understanding of the prior art, a schematic diagram of a hardware structure of a 4G synchronization module and a 5G synchronization module is given below, as shown in fig. 3 and 4, where the 4G synchronization module includes a 4G downlink radio frequency link and a digital processing module, the digital processing module includes a crystal oscillator, and an AD converter, an FPGA, and a processor that are sequentially connected, the crystal oscillator is connected to the processor, and the processor of the 4G synchronization module outputs a 4G synchronization switching signal. The 5G synchronization module comprises a 5G downlink radio frequency link and a digital processing module, wherein the digital processing module comprises a crystal oscillator, an AD converter, an FPGA and a processor, wherein the AD converter, the FPGA and the processor are sequentially connected, the crystal oscillator is connected with the processor, and the processor of the 5G synchronization module can output a 5G synchronization switch signal. The 4G and 5G simultaneous synchronization module of the present application is different from the prior art, as shown in fig. 1, the 4G and 5G simultaneous synchronization module includes a first rf switching circuit, a 4G downlink rf link, a 5G downlink rf link, a second rf switching circuit, and a digital processing module, where a first end of the first rf switching circuit receives a signal input, a second end of the first rf switching circuit is connected with a first end of the 4G downlink rf link, a second end of the 4G downlink rf link is connected with a first end of the second rf switching circuit, and a third end of the second rf switching circuit is connected with the digital processing module; the third end of the first radio frequency switching circuit is connected with the first end of the 5G downlink radio frequency link, and the second end of the 5G downlink radio frequency link is connected with the second end of the second radio frequency switching circuit. The digital processing module comprises a crystal oscillator, an AD converter, an FPGA and a processor which are sequentially connected, wherein the crystal oscillator is connected with the processor. The first radio frequency switching circuit and the second radio frequency switching circuit both comprise radio frequency switches for controlling switching of both the 4G downlink radio frequency link and the 5G downlink radio frequency link.
Based on the above-mentioned 4G and 5G simultaneous synchronization modules, the embodiment of the present application provides a method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater, where the method includes steps S1-S4, as shown in fig. 2:
s1, after a wireless repeater is started, the first radio frequency switching circuit and the second radio frequency switching circuit establish connection between the 4G downlink radio frequency link and the digital processing module, and after 4G signals sequentially enter the digital processing module through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit, the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal.
In step S1, specifically, after the wireless repeater is started, the radio frequency switch in the first radio frequency switching circuit and the radio frequency switch in the second radio frequency switching circuit are switched to the 4G downlink radio frequency link, so that the first radio frequency switching circuit and the second radio frequency switching circuit can establish connection between the 4G downlink radio frequency link and the digital processing module, so that the 4G signal can enter the digital processing module, after the digital processing module receives the 4G signal input by the second radio frequency switching circuit, the digital processing module invokes the 4G synchronization algorithm to perform 4G signal synchronization, and it should be understood that in the 4G communication system, processing and transmission of various data signals are performed in a specified time slot, and in order to enable the whole data communication system to work orderly, accurately and reliably, the first party and the second party must have a unified time standard, that is to complete the consistency of the time of the receiving party and the second party, that is, synchronization is, the standard time point of the 4G signal is found, that is, 4G signal synchronization is performed. The digital processing module then outputs a 4G synchronous switching signal and holds the 4G synchronous switching signal. It should be understood that the 4G synchronization switching signal is a signal for controlling the 4G uplink and downlink to be turned on or off, and the switching of the 4G uplink and downlink can be controlled by the 4G synchronization switching signal. Maintaining the 4G synchronization switching signal means that the 4G synchronization switching signal is guaranteed not to deviate when the 4G signal synchronization is not performed. When the 4G signal is not synchronized, the 4G synchronization switching signal is also shifted due to the frequency offset of the crystal oscillator, which affects the switching accuracy of the 4G uplink and downlink, and therefore, the 4G synchronization switching signal needs to be held. The step of maintaining the 4G synchronous switching signal includes: when 4G signal synchronization is carried out, the processor (MCU chip) obtains a group of parameters for adjusting crystal oscillator precision by comparing the local clock with the 4G synchronous switching signal, and when the 4G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 4G synchronous switching signal, so that the 4G synchronous switching signal is kept. After the 4G synchronization switching signal is outputted, the 4G synchronization switching signal is held based on the outputted 4G synchronization switching signal.
S2, after the 5G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 4G downlink radio frequency link and the digital processing module, and establish the connection between the 5G downlink radio frequency link and the digital processing module, and after a 5G signal sequentially passes through the first radio frequency switching circuit, the 5G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 5G synchronization algorithm to perform 5G signal synchronization, outputs a 5G synchronization switching signal and maintains the 5G synchronization switching signal.
In step S2, specifically, a first duration is preset, after the wireless repeater starts, timing will start, when the first duration arrives, it is determined that the 5G switching time arrives, after the 5G switching time arrives, the radio frequency switch in the first radio frequency switching circuit and the radio frequency switch in the second radio frequency switching circuit will switch to the 5G downlink radio frequency link, so that the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the 4G downlink radio frequency link from the digital processing module, and establish the connection between the 5G downlink radio frequency link and the digital processing module, so that the 5G signal can enter the digital processing module, and after the digital processing module receives the 5G signal input by the switching circuit, a 5G synchronization algorithm is called to perform 5G signal synchronization. And finding a standard time point of the 5G signal, namely performing 5G signal synchronization. The digital processing module outputs a 5G synchronous switching signal and maintains the 5G synchronous switching signal. It should be understood that the 5G synchronization switching signal is a signal for controlling the 5G uplink and downlink to be turned on or off, and the 5G uplink and downlink switching can be controlled by the 5G synchronization switching signal. Maintaining the 5G sync switch signal means that the 5G sync switch signal is guaranteed not to be shifted when the 5G signal synchronization is not performed. When the 5G signal is not synchronized, the 5G synchronization switching signal is also shifted due to the frequency offset of the crystal oscillator, which affects the switching accuracy of the 5G uplink and downlink, and therefore, the 5G synchronization switching signal needs to be held. The step of maintaining the 5G synchronous switching signal includes: when 5G signal synchronization is carried out, the processor (MCU chip) obtains a group of parameters for adjusting crystal oscillator precision by comparing the local clock with the 5G synchronous switching signal, and when the 5G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 5G synchronous switching signal, so that the maintenance of the 5G synchronous switching signal is realized. After outputting the 5G synchronous switching signal, the holding of the 5G synchronous switching signal is performed based on the output 5G synchronous switching signal.
And S3, after the 4G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 5G downlink radio frequency link and the digital processing module, and establish the connection between the 4G downlink radio frequency link and the digital processing module, and after 4G signals sequentially pass through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enter the digital processing module, the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal.
In step S3, specifically, after the second duration is preset and the switch is switched to the 5G downlink radio frequency link, timing is restarted, when the second duration arrives, it is determined that the 4G switching time arrives, after the 4G switching time arrives, the radio frequency switch in the first radio frequency switching circuit and the radio frequency switch in the second radio frequency switching circuit will switch to the 4G downlink radio frequency link, so that the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the 5G downlink radio frequency link from the digital processing module, and establish the connection between the 4G downlink radio frequency link and the digital processing module, so that the 4G signal can enter the digital processing module, and after the digital processing module receives the 4G signal input by the switching circuit, the digital processing module invokes the 4G synchronization algorithm to perform 4G signal synchronization and output the 4G synchronization switch signal.
S4, repeating the steps S2-S3.
And after the step S3 is switched to the 4G downlink radio frequency link, restarting timing, judging that the 5G switching time is reached when the first time length is reached, and repeating the steps S2-S3, so that the wireless repeater can continuously transmit the 4G and 5G synchronous switching signals, and the wireless repeater can synchronously synchronize the 4G and 5G signals. In addition, the above embodiment optimizes the synchronization algorithm and the synchronization switch time keeping by improving the access and the switching of the 4G and 5G signals, realizes that the 4G and 5G signals are synchronized simultaneously on one synchronization module, and compared with the prior art that two synchronization modules are needed for synchronizing the 4G and 5G signals simultaneously, the two synchronization modules are needed to mean that two digital processing modules are needed, and the 4G and 5G signals simultaneously require only one digital processing module, thereby reducing the equipment synchronization cost and improving the product competitiveness.
In an embodiment, the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, and outputting a 4G synchronization switching signal specifically includes:
and the digital processing module sequentially performs AD conversion, OFDM demodulation, PSS correlation and SSS correlation on the received 4G signals to complete 4G signal synchronization and output a 4G synchronous switching signal.
In the embodiment of the present application, AD conversion refers to analog-to-digital conversion, that is, conversion of an analog signal into a digital signal, and OFDM (Orthogonal Frequency Division Multiplexing ) demodulation refers to a process of demodulating a signal modulated using an Orthogonal Frequency Division Multiplexing (OFDM) technique. At the receiving end, the received OFDM signal is subjected to frequency domain processing, and the data of each subcarrier is demodulated and recovered, so that the original transmission data is obtained. Performing PSS correlation refers to performing a correlation operation on PSS (primary synchronization signal) in a signal, which includes the process of receiving the PSS signal, demodulating the PSS signal, and further processing to obtain cell synchronization and timing information. PSS, collectively known as Primary Synchronization Signal (primary synchronization signal), is a concept in wireless communications to achieve clock and frequency synchronization between a base station and a mobile device. PSS is used in combination with SSS (Secondary Synchronization Signal ) in LTE (i.e. 4G) systems, together completing the cell search and time synchronization procedure. SSS correlation refers to correlating SSS (secondary synchronization signal) in a signal. This includes the process of receiving the SSS signal, demodulating the SSS signal, and further processing to obtain cell identification information.
In one embodiment, the step of the digital processing module calling a 5G synchronization algorithm to perform 5G signal synchronization and outputting a 5G synchronization switching signal includes:
the digital processing module sequentially performs AD conversion, OFDM demodulation, PSS correlation, SSS correlation, PBCH channel estimation, channel equalization, demodulation, descrambling, de-rate matching and decoding on the received 5G signals to complete 5G signal synchronization and output 5G synchronous switching signals.
In the embodiment of the present application, the AD conversion, OFDM demodulation, PSS correlation, SSS correlation are the same as the above explanation, and the embodiment of the present application is not described here again. In 5G networks, in addition to PSS (Primary Synchronization Signal ) and SSS (Secondary Synchronization Signal, secondary synchronization Signal), the base station is also connected to PBCH (Physical Broadcast Channel )
Together, SSBs (Synchronization Signal Block, synchronization signal blocks) are composed for achieving more complex and efficient synchronization and broadcast signal transmission.
In an embodiment, after the step of the first radio frequency switching circuit and the second radio frequency switching circuit establishing a connection between the 4G downlink radio frequency link and the digital processing module, the method further comprises:
starting timing, and judging that the 5G switching time is reached after the preset first time length is reached;
after the steps of disconnecting the 4G downlink rf link from the digital processing module and establishing a connection between the 5G downlink rf link and the digital processing module, the method further includes:
restarting timing, and judging that the 4G switching time is reached after the preset second time length is reached;
after the step of establishing the connection between the 4G downlink radio frequency link and the digital processing module, the method further comprises:
the timing is restarted, and after the preset first time length is reached, the 5G switching time is judged to be reached.
In this embodiment of the present application, the first preset duration and the second preset duration may be the same or different. The embodiment of the application judges whether the switching time is reached or not in a clock timing mode, and is simple and easy to implement.
In an embodiment, the step of maintaining the 4G synchronous switching signal includes:
when 4G signal synchronization is carried out, a set of parameters for adjusting crystal oscillator precision are obtained by a processor of the digital processing module through comparing a local clock with the 4G synchronous switching signal, and when the 4G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 4G synchronous switching signal, so that the 4G synchronous switching signal is kept.
In one embodiment, the step of maintaining the 5G synchronous switching signal includes:
when 5G signal synchronization is carried out, a group of parameters for adjusting crystal oscillator precision are obtained by a processor of the digital processing module through comparing a local clock with the 5G synchronous switching signal, and when the 5G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 5G synchronous switching signal, so that the 5G synchronous switching signal is kept.
In an embodiment, the 4G downlink radio frequency link includes a first filter, a first low noise amplifier, a first radio frequency attenuator, and a first radio frequency amplifier that are sequentially connected, where the 4G signal enters the first filter to filter out the out-of-band signal, enters the first low noise amplifier to perform low noise amplification, enters the first radio frequency attenuator to adjust power, and finally enters the first radio frequency amplifier to perform power amplification.
In this embodiment of the present application, specifically, after the signal passes through the antenna, it enters the 4G downlink radio frequency link, after it enters the 4G downlink radio frequency link, it first filters out-of-band signals through a first filter, so that 4G signals can be obtained, and then low noise amplification is performed through a first low noise amplifier (first LNA (Low Noise Amplifier)), so that noise introduced in the signal transmission process can be reduced, then it enters a first radio frequency attenuator to adjust power, so that signal transmission efficiency can be optimized, and signal distortion caused by excessive amplification can be avoided, and finally, it enters the first radio frequency amplifier to perform power amplification, so that signal coverage can be effectively ensured.
In an embodiment, the 5G downlink radio frequency link includes a second filter, a second low noise amplifier, a second radio frequency attenuator, and a second radio frequency amplifier that are sequentially connected, where the 5G signal sequentially enters the second filter to filter out-of-band signals, enters the second low noise amplifier to perform low noise amplification, enters the second radio frequency attenuator to adjust power, and finally enters the second radio frequency amplifier to perform power amplification.
In the embodiment of the application, specifically, after the signal passes through the antenna, the signal enters the 5G downlink radio frequency link, after the signal enters the 5G downlink radio frequency link, the out-of-band signal is filtered by the second filter, so that the 5G signal can be obtained, and then the signal is amplified by the second low noise amplifier (second LNA), so that the noise introduced in the signal transmission process can be reduced, then the signal enters the second radio frequency attenuator to adjust the power, the signal transmission efficiency can be optimized, the signal distortion caused by over amplification is avoided, and finally the signal enters the second radio frequency amplifier to amplify the power, so that the signal coverage can be effectively ensured.
The repeater includes other components known and necessary to those skilled in the art, and the repeater is capable of performing the functions of the repeater.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided herein and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, apparatus, article, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, apparatus, article, or method. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, apparatus, article or method that comprises the element.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structures or equivalent processes using the descriptions and drawings of the present invention or directly or indirectly applied to other related technical fields are included in the scope of the invention.
Claims (8)
1. A method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater, wherein the wireless repeater includes a 4G and 5G simultaneous synchronization module, the 4G and 5G simultaneous synchronization module includes a first radio frequency switching circuit, a 4G downlink radio frequency link, a 5G downlink radio frequency link, a second radio frequency switching circuit, and a digital processing module, the method includes:
s1, after a wireless repeater is started, a connection between the 4G downlink radio frequency link and the digital processing module is established through the first radio frequency switching circuit and the second radio frequency switching circuit, and after a 4G signal sequentially passes through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal;
s2, after the 5G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 4G downlink radio frequency link and the digital processing module, and establish the connection between the 5G downlink radio frequency link and the digital processing module, and after a 5G signal sequentially passes through the first radio frequency switching circuit, the 5G downlink radio frequency link and the second radio frequency switching circuit and enters the digital processing module, the digital processing module calls a 5G synchronization algorithm to perform 5G signal synchronization, outputs a 5G synchronization switching signal and maintains the 5G synchronization switching signal;
s3, after the 4G switching time is reached, the first radio frequency switching circuit and the second radio frequency switching circuit disconnect the connection between the 5G downlink radio frequency link and the digital processing module, and establish the connection between the 4G downlink radio frequency link and the digital processing module, and after 4G signals sequentially pass through the first radio frequency switching circuit, the 4G downlink radio frequency link and the second radio frequency switching circuit and enter the digital processing module, the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, outputs a 4G synchronization switching signal and keeps the 4G synchronization switching signal;
s4, repeating the steps S2-S3.
2. The method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater according to claim 1, wherein the digital processing module invokes a 4G synchronization algorithm to perform 4G signal synchronization, and outputting a 4G synchronization switching signal specifically includes:
and the digital processing module sequentially performs AD conversion, OFDM demodulation, PSS correlation and SSS correlation on the received 4G signals to complete 4G signal synchronization and output a 4G synchronous switching signal.
3. The method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater according to claim 1, wherein the step of the digital processing module invoking a 5G synchronization algorithm to perform 5G signal synchronization and outputting a 5G synchronization switching signal includes:
the digital processing module sequentially performs AD conversion, OFDM demodulation, PSS correlation, SSS correlation, PBCH channel estimation, channel equalization, demodulation, descrambling, de-rate matching and decoding on the received 5G signals to complete 5G signal synchronization and output 5G synchronous switching signals.
4. The method for simultaneously synchronizing a 4G signal and a 5G signal of a wireless repeater according to claim 1, wherein after the step of establishing a connection between the 4G downlink radio frequency link and the digital processing module by the first radio frequency switching circuit and the second radio frequency switching circuit, the method further comprises:
starting timing, and judging that the 5G switching time is reached after the preset first time length is reached;
after the steps of disconnecting the 4G downlink rf link from the digital processing module and establishing a connection between the 5G downlink rf link and the digital processing module, the method further includes:
restarting timing, and judging that the 4G switching time is reached after the preset second time length is reached;
after the step of establishing the connection between the 4G downlink radio frequency link and the digital processing module, the method further comprises:
the timing is restarted, and after the preset first time length is reached, the 5G switching time is judged to be reached.
5. The method for achieving simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater according to claim 1, wherein the step of maintaining the 4G synchronized switching signal comprises:
when 4G signal synchronization is carried out, a set of parameters for adjusting crystal oscillator precision are obtained by a processor of the digital processing module through comparing a local clock with the 4G synchronous switching signal, and when the 4G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 4G synchronous switching signal, so that the 4G synchronous switching signal is kept.
6. The method for achieving simultaneous synchronization of a wireless repeater 4G signal and a 5G signal of claim 1, wherein the step of maintaining the 5G synchronized switching signal comprises:
when 5G signal synchronization is carried out, a group of parameters for adjusting crystal oscillator precision are obtained by a processor of the digital processing module through comparing a local clock with the 5G synchronous switching signal, and when the 5G signal synchronization is not carried out, the processor continuously adjusts the crystal oscillator frequency according to the parameters, tests and outputs the 5G synchronous switching signal, so that the 5G synchronous switching signal is kept.
7. The method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater according to claim 1, wherein the 4G downlink radio frequency link includes a first filter, a first low noise amplifier, a first radio frequency attenuator, and a first radio frequency amplifier that are sequentially connected, the 4G signal sequentially enters the first filter to filter out-of-band signals, enters the first low noise amplifier to perform low noise amplification, enters the first radio frequency attenuator to adjust power, and finally enters the first radio frequency amplifier to perform power amplification.
8. The method for implementing simultaneous synchronization of a 4G signal and a 5G signal of a wireless repeater according to claim 1, wherein the 5G downlink radio frequency link includes a second filter, a second low noise amplifier, a second radio frequency attenuator, and a second radio frequency amplifier that are sequentially connected, the 5G signal sequentially enters the second filter to filter out-of-band signals, enters the second low noise amplifier to perform low noise amplification, enters the second radio frequency attenuator to adjust power, and finally enters the second radio frequency amplifier to perform power amplification.
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