CN113938140A - Remote transmission covering method, system and remote unit - Google Patents
Remote transmission covering method, system and remote unit Download PDFInfo
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- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
Abstract
The disclosure relates to a remote transmission coverage method, a system and a remote unit, wherein the method comprises the following steps: receiving a plurality of carrier signals, processing based on the plurality of carrier signals to obtain a plurality of paths of radio frequency signals, performing power amplification on the plurality of paths of radio frequency signals, inputting the plurality of paths of radio frequency signals into a filtering integrated module in a remote unit to filter the plurality of paths of radio frequency signals, combining the filtered plurality of paths of radio frequency signals based on the signal types of the plurality of paths of radio frequency signals, generating radio frequency signals with target bandwidth, and sending the radio frequency signals to an antenna; wherein, the filtering integration module comprises a filter, a circulator and an electric bridge which are connected in sequence. Therefore, large-bandwidth signal transmission of each antenna port is achieved, the large-bandwidth and large-power signal coverage requirement is met, the network building cost is reduced, the network building convenience is improved, and meanwhile the communication quality is improved.
Description
Technical Field
The present disclosure relates to the field of communications technologies, and in particular, to a remote transmission coverage method, system, and remote unit.
Background
With the advent of the 5G era, various 5G products such as RRUs (Remote Radio units), DASs (Distributed Antenna systems) or repeaters have been developed by various large communication manufacturers, and the carrier operating bandwidth supported by the RRUs, the DASs or the repeaters is generally between 100M and 200M at present, which cannot meet the requirement of the operator for co-site multi-carrier large bandwidth application.
In the related art, hardware paths are added (for example, 300M bandwidth signals need to be covered, 150M before channel 1 transmission and 150M after channel 2 transmission), and then each path is externally provided with an antenna separately, because each antenna only has a signal of one frequency band, 2 antennas are needed for covering 300M signals in one direction, and the number of antennas needed for covering multiple directions is more. This results in a significant increase in the overall cost of the system, both in construction costs and in operational and maintenance costs. Meanwhile, due to mutual interference among a plurality of signals, the quality of the output signal is poor, and the requirements of 5G new services on communication quality and reliability cannot be met.
Disclosure of Invention
In order to solve the above technical problems or at least partially solve the above technical problems, the present disclosure provides a remote transmission coverage method, system and remote unit, in which a filter, a circulator and a bridge are sequentially disposed in the remote unit, so that not only is the cost greatly reduced, but also the influence of noise floor superposition is reduced and optimized, and the quality and reliability of communication are improved.
In a first aspect, the present disclosure provides a remote transmission coverage method, applied to a remote unit, including:
receiving a plurality of carrier signals;
processing based on the plurality of carrier signals to obtain a plurality of paths of radio frequency signals;
the multi-channel radio frequency signals are subjected to power amplification and then input into a filtering integration module in the remote unit so as to be filtered, the filtered multi-channel radio frequency signals are combined based on the signal types of the multi-channel radio frequency signals, and radio frequency signals with target bandwidth are generated and sent to an antenna; the filtering integrated module comprises a filter, a circulator and an electric bridge which are sequentially connected.
According to the remote transmission coverage method provided by the first aspect, a plurality of carrier signals are received, processing is carried out based on the plurality of carrier signals, a plurality of paths of radio frequency signals are obtained, the power of the plurality of paths of radio frequency signals is amplified and then input into the filtering integration module in the remote unit to filter the plurality of paths of radio frequency signals, the filtered plurality of paths of radio frequency signals are combined based on the signal types of the plurality of paths of radio frequency signals, radio frequency signals with target bandwidth are generated and sent to the antennas, the transmission of large-bandwidth signals at each antenna port is achieved, the coverage requirements of the large-bandwidth and large-power signals are met, the network construction cost is reduced, the network construction convenience is improved, and meanwhile the communication quality is improved.
In a second aspect, the present disclosure provides a remote transmission coverage method, applied to a remote unit, including:
receiving a radio frequency signal of a target bandwidth;
inputting the radio frequency signal into a filtering integrated module in the remote unit to shunt the radio frequency signal, generating a plurality of paths of radio frequency signals, filtering, and performing power amplification on the filtered plurality of paths of radio frequency signals;
and performing signal format conversion on the power-amplified multi-channel radio frequency signals to obtain a plurality of carrier signals and transmitting the carrier signals.
In a third aspect, the present disclosure provides a remote unit, comprising:
the digital circuit is used for receiving a plurality of carrier signals, processing the carrier signals based on the carrier signals, acquiring a plurality of paths of radio frequency signals and respectively sending the signals to the radio frequency circuits;
the plurality of radio frequency circuits are connected with the digital circuit and used for sending the plurality of radio frequency signals to the corresponding power amplifier modules;
the power amplification modules are connected with the radio frequency circuits in a one-to-one correspondence manner and are used for carrying out power amplification on the multi-channel radio frequency signals;
the filtering integrated module is connected with the plurality of power amplification modules, comprises a filter, a first circulator and an electric bridge which are sequentially connected, is connected with each power amplification module in a one-to-one correspondence manner, and is used for filtering each path of radio frequency signals after power amplification;
a first circulator connected to each of the filters for inputting the radio frequency signal into the bridge according to a signal type;
the electric bridge is connected with the first circulator and is used for combining the radio-frequency signals with the same signal type to generate a radio-frequency signal with a target bandwidth and sending the radio-frequency signal to an antenna; the number of the filters and the number of the first circulators are both n, and the number of the bridges is m, wherein m is n/2, and n is a positive integer greater than or equal to 2.
In a fourth aspect, the present disclosure provides a remote unit, comprising:
the electric bridge in the filtering integrated module connected with the antenna is used for acquiring a radio frequency signal with a target bandwidth, and shunting the radio frequency signal to generate a plurality of paths of radio frequency signals; the filtering integrated module comprises a filter, a first circulator and an electric bridge which are sequentially connected;
the first circulator is connected with the bridge and is used for inputting each path of radio frequency signal into the filter;
the filter is connected with each first circulator and is used for filtering each radio frequency signal; the number of the filters and the number of the first circulators are both n, and the number of the bridges is m, wherein m is n/2, and n is a positive integer greater than or equal to 2;
each power amplification module connected with each filter is used for amplifying the power of each path of radio frequency signals after filtering;
the radio frequency circuits are connected with the power amplifier modules in a one-to-one correspondence mode and used for receiving each path of radio frequency signals after power amplification and sending the radio frequency signals to the digital circuit;
and the digital circuit is connected with each radio frequency circuit and is used for carrying out signal format conversion on the multi-channel radio frequency signals, acquiring a plurality of carrier signals and transmitting the carrier signals.
In a fifth aspect, the present disclosure provides a remote transmission coverage system, comprising: a proximal unit, an expansion unit and the distal unit of the previous third aspect embodiment;
the near-end unit is configured to receive multiple radio frequency signals sent by multiple base stations, amplify and frequency-convert the multiple radio frequency signals through a radio frequency circuit in the near-end unit, and perform signal format conversion on the amplified and frequency-converted radio frequency signals through a digital module in the near-end unit to generate digital optical signals, and send the digital optical signals to the extension unit;
the extension unit is used for generating a plurality of carrier signals according to the monitoring setting information and the received digital optical signals of different channels according to a preset protocol and distributing the carrier signals to different antenna ports of the remote unit;
the remote unit is used for receiving the carrier signals, processing the carrier signals based on the carrier signals to obtain multiple radio frequency signals, filtering the multiple radio frequency signals after power amplification of the multiple radio frequency signals, combining the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generating radio frequency signals with target bandwidth, and sending the radio frequency signals to an antenna.
In a sixth aspect, the present disclosure provides a remote transmission covering system, comprising a proximal unit and the remote unit of the foregoing third aspect embodiment;
the near-end unit is configured to receive multiple radio frequency signals sent by multiple base stations, amplify and frequency-convert the multiple radio frequency signals through a radio frequency circuit in the near-end unit, and perform signal format conversion on the amplified and frequency-converted radio frequency signals through a digital module in the near-end unit to generate multiple carrier signals, and send the multiple carrier signals to the remote unit;
the remote unit is used for receiving the carrier signals, processing the carrier signals based on the carrier signals to obtain multiple radio frequency signals, filtering the multiple radio frequency signals after power amplification of the multiple radio frequency signals, combining the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generating radio frequency signals with target bandwidth, and sending the radio frequency signals to an antenna.
In a seventh aspect, the present disclosure provides a remote transmission coverage system, including a baseband processing unit and the remote unit in the foregoing third aspect embodiment;
the baseband processing unit is configured to generate the plurality of carrier signals;
the remote unit is used for receiving a plurality of carrier signals, processing based on the carrier signals to obtain a plurality of paths of radio frequency signals, filtering the plurality of paths of radio frequency signals after power amplification of the plurality of paths of radio frequency signals, combining the filtered plurality of paths of radio frequency signals based on the signal types of the plurality of paths of radio frequency signals, generating a radio frequency signal with a target bandwidth, and sending the radio frequency signal to an antenna.
In an eighth aspect, the present disclosure provides a remote transmission coverage system, comprising: a proximal unit, an expansion unit and the remote unit of the fourth embodiment;
the remote unit is configured to receive a radio frequency signal with a target bandwidth, input the radio frequency signal into a filtering integration module in the remote unit, shunt the radio frequency signal, generate multiple radio frequency signals, filter the multiple radio frequency signals, amplify power of the multiple radio frequency signals after filtering, perform signal format conversion on the multiple radio frequency signals after power amplification, acquire multiple carrier signals, and send the multiple carrier signals to the extension unit;
the extension unit is used for receiving the plurality of carrier signals, analyzing the plurality of carrier signals and acquiring digital optical signals;
and the near-end unit is used for receiving the digital optical signal, performing format conversion on the digital optical signal to generate a radio frequency signal, processing the radio frequency signal through a radio frequency circuit in the near-end unit, and then sending the radio frequency signal to a base station.
In a ninth aspect, the present disclosure provides a remote transmission covering system, comprising a proximal unit and the remote unit of the foregoing fourth aspect embodiments;
the remote unit receives a radio frequency signal with a target bandwidth, inputs the radio frequency signal into a filtering integration module in the remote unit to shunt the radio frequency signal, generates a plurality of paths of radio frequency signals, then carries out filtering, carries out power amplification on the filtered plurality of paths of radio frequency signals, carries out signal format conversion on the power-amplified plurality of paths of radio frequency signals, acquires a plurality of carrier signals and sends the carrier signals to the near-end unit;
and the near-end unit is used for performing format conversion on the plurality of carrier signals to generate a plurality of radio frequency signals, and processing the radio frequency signals through a radio frequency circuit in the near-end unit and then sending the radio frequency signals to a base station.
In a tenth aspect, the present disclosure provides a remote transmission coverage system, including a baseband processing unit and the remote unit in the foregoing fourth aspect;
the remote unit receives a radio frequency signal with a target bandwidth, inputs the radio frequency signal into a filtering integration module in the remote unit to shunt the radio frequency signal, generates a plurality of paths of radio frequency signals, then carries out filtering, carries out power amplification on the filtered plurality of paths of radio frequency signals, carries out signal format conversion on the power-amplified plurality of paths of radio frequency signals, acquires a plurality of carrier signals and sends the carrier signals to the baseband processing unit;
the baseband processing unit is configured to receive the plurality of carrier signals.
The beneficial effects of the remote transmission coverage method provided in the second aspect and each possible design of the second aspect, the remote unit provided in the third, fourth aspect and each possible design of the third, fourth aspect, and the remote transmission coverage system provided in the fifth, sixth, seventh, eighth, ninth, and tenth aspects and each possible design of the third, fourth, and fifth aspects may refer to the beneficial effects brought by each possible implementation manner of the first aspect and the first aspect, and are not repeated herein.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present disclosure, the drawings used in the description of the embodiments or prior art will be briefly described below, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without inventive exercise.
Fig. 1 is a diagram illustrating an example of a large bandwidth transmission of the related art;
FIG. 2 is a diagram illustrating another example of a related art large bandwidth transmission;
fig. 3 is a flowchart illustrating a remote transmission coverage method according to an embodiment of the disclosure;
fig. 4 is a schematic flowchart of another remote transmission coverage method according to the embodiment of the present disclosure;
fig. 5 is a schematic structural diagram of a remote unit according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of another remote unit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of another remote unit according to an embodiment of the disclosure
Fig. 8 is a schematic structural diagram of a filtering integrated module according to an embodiment of the disclosure;
fig. 9 is a diagram illustrating another exemplary structure of a filtering integration module according to an embodiment of the disclosure;
fig. 10 is a diagram illustrating a structure of another filtering integration module according to an embodiment of the disclosure;
fig. 11 is a schematic structural diagram of a remote transmission coverage system according to an embodiment of the present disclosure;
fig. 12 is a schematic structural diagram of another remote transmission coverage system according to an embodiment of the present disclosure;
fig. 13 is a schematic structural diagram of a remote transmission coverage system according to another embodiment of the present disclosure;
fig. 14 is an exemplary diagram of a remote transmission overlay system according to an embodiment of the present disclosure;
fig. 15 is an exemplary diagram of another remote transmission coverage system according to an embodiment of the disclosure.
Detailed Description
In order that the above objects, features and advantages of the present disclosure may be more clearly understood, aspects of the present disclosure will be further described below. It should be noted that the embodiments and features of the embodiments of the present disclosure may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present disclosure, but the present disclosure may be practiced in other ways than those described herein; it is to be understood that the embodiments disclosed in the specification are only a few embodiments of the present disclosure, and not all embodiments.
In practical application, in order to meet the requirement of operator co-site co-location multi-carrier large bandwidth application, hardware paths (for example, 300M bandwidth signals need to be covered, 150M before channel 1 transmission and 150M after channel 2 transmission) can be added, then each hardware path is externally provided with an antenna separately, each antenna only has a signal of one frequency band, so that 2 antennas are needed for covering 300M signals in one direction, the number of antennas needed for covering multiple directions is more, or 2 sets of equipment are used for respectively working under different bandwidths to cover the area together, and the investment cost of covering is increased. And the mutual interference between the signals deteriorates the signal-to-noise ratio, and the requirement of a 5G new service cannot be met.
In view of the above problems, an embodiment of the present disclosure provides a remote transmission coverage method, in which a circulator and an electric bridge connected in sequence are added at the rear end of a filter to form a filtering integrated module to filter multiple radio frequency signals, the filtered multiple radio frequency signals are combined based on the signal types of the multiple radio frequency signals, and a radio frequency signal with a target bandwidth is generated and sent to an antenna, so that each antenna port can output a radio frequency signal with a large bandwidth (for example, 300M or even higher bandwidth), thereby meeting the application requirement of co-site and co-site applications of operators, greatly facilitating the actual coverage requirement, and simultaneously ensuring that non-working bandwidth bottom noises output by each channel are all output after being filtered by the filter, and the overlapping influence of the bottom noises when adjacent frequency band signals are combined is reduced and optimized, thereby improving the quality of the signals.
Specifically, taking the case of covering signals by multiple device segments (taking 300M signal coverage as an example, the related scheme is to use one device to perform front 160M frequency band signal coverage and then use one device to perform back 140M frequency band signal coverage), as shown in fig. 1, the scheme of using multi-channel direct transmission coverage is adopted, although the whole device can output 300M signals, each output port and antenna thereof can only output 160M (or 140M) signals, and the requirement of 300M signal coverage per antenna or output port cannot be met.
The embodiment of the disclosure provides a remote transmission covering method which can be completed by only one device and has cost advantage and installation advantage (installation space saving).
Specifically, as shown in fig. 2, according to the technical scheme of implementing large bandwidth coverage by connecting an external bridge to the device, when a standing wave signal at any port of the bridge output port connected to the antenna is, for example, a 300M combined signal, a reflection signal is a combined signal of a frequency band signal of the filter 1 and a frequency band signal of the filter 2, a standing wave matching design at the port of the filter 1 only matches the frequency band 1, a standing wave matching design at the port of the filter 2 only matches the frequency band 2, and due to mismatching of the reflection signal and the bandwidth of the filter, a standing wave at the antenna port is inevitably large.
The embodiment of the disclosure provides a remote transmission covering method, which has the advantage of intact standing wave loop, and meanwhile, the whole installation is beautiful, simple and convenient.
Fig. 3 is a flowchart illustrating a method for remote transmission coverage according to an embodiment of the present disclosure, where the method is applied to a remote unit, as shown in fig. 1, and includes:
step 301 receives a plurality of carrier signals.
In the embodiment of the present disclosure, the Remote Unit may be a Remote Unit in a repeater, may also be a Remote Radio Unit (RRU) connected to a bbu (base band Unit) optical fiber, and may also be a Remote Unit in a DAS (Distributed Antenna System).
In the disclosed embodiment, the multiple carrier signals refer to digital optical signals loaded on a certain frequency signal, and for the remote units in different scenarios, the multiple carrier signals are all sent by the receiving near-end unit, the extension unit, or the BBU.
Taking DAS as an example, Multiple carrier signals of Multiple operators are received, such as operator 1, carrier 1-1 (such as SISO (single input single output)) has a bandwidth value of 60M, carrier 1-2 (such as MIMO (Multiple In Multiple Out)) is 90M, operator 2, carrier 2-1 (such as SISO) has a bandwidth value of 100M, carrier 2-2 (such as MIMO) is 50M, operator 3, carrier 3-1 (such as SISO) has a bandwidth value of 100M, carrier 3-2 (such as MIMO) is 70M, operator 4, carrier 4-1 (such as SISO) has a bandwidth value of 40M, and carrier 4-2 (such as MIMO) is 90M.
In the embodiment of the present disclosure, there are many ways to obtain multiple radio frequency signals based on processing of multiple carrier signals, and as a possible implementation manner, multiple carrier signals are carrier signals of multiple operators, and are combined based on bandwidth values and signal types of the multiple carrier signals to generate multiple target carrier signals, and perform signal format conversion based on the multiple target carrier signals to obtain multiple radio frequency signals.
Continuing with the above example, according to the signal type, such as SISO, the 60M carrier 1-1 signal and the 100M carrier 2-1 signal of the operator 1 and the operator 2 are combined to obtain the 160M carrier signal a, such as MIMO, the 90M carrier 1-2 signal and the 50M carrier 2-2 signal of the operator 1 and the operator 2 are combined to obtain the 140M carrier signal B, the 100M carrier 3-1 signal and the 40M carrier 4-1 signal of the operator 3 and the operator 4 are combined to obtain the 140M carrier signal C, such as MIMO, the 70M carrier 3-2 signal and the 90M carrier 4-2 signal of the operator 3 and the operator 4 are combined to obtain the 160M carrier signal D, and finally the carrier signal a, the carrier signal B, the carrier signal C and the carrier signal D are respectively subjected to signal format conversion, and converting the digital signal into a radio frequency signal to obtain a radio frequency signal A, a radio frequency signal B, a radio frequency signal C and a radio frequency signal D.
In another possible implementation manner of the present disclosure, the obtained multiple carrier signals are carrier signals sent by the BBU, and the multiple carrier signals are directly subjected to signal format conversion to obtain multiple radio frequency signals.
In the embodiment of the disclosure, the remote unit includes a filter integration module in which a filter, a circulator and a bridge are sequentially connected, receives the multiple radio frequency signals subjected to power amplification and filters the multiple radio frequency signals, combines the multiple radio frequency signals subjected to filtering based on the signal types of the multiple radio frequency signals, generates a radio frequency signal with a target bandwidth, and sends the radio frequency signal to the antenna. The target bandwidth can be selected and set according to the application scene requirements.
Continuing with the above example as an example, the radio frequency signal a and the radio frequency signal C of the SISO type are combined to obtain a radio frequency signal with a large bandwidth of 300M and send the radio frequency signal to the antenna, the radio frequency signal B and the radio frequency signal D of the MIMO type are combined to obtain a radio frequency signal with a large bandwidth of 300M and send the radio frequency signal to the antenna, and thus, the filtering integration module processes the radio frequency signal to obtain a recovered radio frequency signal and sends the recovered radio frequency signal to the coverage area through the antenna.
In summary, in the remote transmission coverage method disclosed by the present disclosure, multiple carrier signals are received and processed based on the multiple carrier signals to obtain multiple radio frequency signals, the multiple radio frequency signals are power-amplified and then input to a filtering integration module in a remote unit to filter the multiple radio frequency signals, the filtered multiple radio frequency signals are combined based on the signal types of the multiple radio frequency signals to generate radio frequency signals with a target bandwidth, and the radio frequency signals are sent to an antenna; wherein, the filtering integration module comprises a filter, a circulator and an electric bridge which are connected in sequence. Therefore, large-bandwidth signal transmission of each antenna port is achieved, the large-bandwidth and large-power signal coverage requirement is met, the network building cost is reduced, the network building convenience is improved, and meanwhile the communication quality is improved.
Based on the foregoing embodiment, mainly directed to description of a downlink signal processing manner, the present disclosure provides another remote transmission coverage method, mainly describing an uplink signal processing manner, fig. 4 is a flowchart illustrating another remote transmission coverage method according to an embodiment of the present disclosure, where the method is applied to a remote unit, and as shown in fig. 4, the method includes:
In the embodiment of the disclosure, the remote unit includes a filter integration module in which a filter, a circulator, and an electrical bridge are sequentially connected, and after receiving a radio frequency signal with a target bandwidth, the remote unit shunts the radio frequency signal to generate a plurality of radio frequency signals, then performs filtering, performs power amplification on the filtered plurality of radio frequency signals, performs signal format conversion on the power-amplified plurality of radio frequency signals, and obtains and transmits a plurality of carrier signals. The target bandwidth can be selected and set according to the application scene requirements.
Taking DAS as an example, receiving a radio frequency signal with a large bandwidth of 300M of an antenna, splitting the radio frequency signal with the large bandwidth of 300M, generating a 140M radio frequency signal and a 160M radio frequency signal, filtering the generated signals, respectively, performing power amplification on the filtered signals, performing signal format conversion on the power-amplified signals, and obtaining a 140M carrier signal and a 160M carrier signal for transmission.
Therefore, the filter, the circulator and the bridge are sequentially arranged in the remote unit, so that the cost is greatly reduced, the influence of superposition of background noise is reduced and optimized, and the quality and the reliability of communication are improved.
Based on the above embodiments, the embodiments of the present disclosure provide a remote unit.
Next, a specific implementation structure of the remote unit 100 will be described with reference to fig. 5 to 6.
Specifically, as shown in fig. 5, the remote unit 100 includes a digital circuit 101, a radio frequency circuit 102, a power amplifier module 103, and a filtering integration module 104; the filtering integration module 104 includes a filter 1041, a first circulator 1042, and a bridge 1043, which are connected in sequence.
The digital circuit 101 is configured to receive a plurality of carrier signals, perform processing based on the plurality of carrier signals, obtain a plurality of channels of radio frequency signals, and send the channels of radio frequency signals to the plurality of radio frequency circuits 102.
And the radio frequency circuits 102 are connected with the digital circuit 101 and used for sending the multiple radio frequency signals to the corresponding power amplifier modules 103.
And the power amplifier modules 103 are connected with the radio frequency circuits 102 in a one-to-one correspondence manner and are used for performing power amplification on the multiple radio frequency signals.
And the filtering integrated module 104 is connected with the plurality of power amplifier modules 103, and the filtering integrated module 104 includes filters 1041, a first circulator 1042 and an electric bridge 1043 which are connected in sequence, and the filters 1041 which are connected with each power amplifier module 103 in a one-to-one correspondence manner are used for filtering the multiple radio frequency signals after power amplification.
A first circulator 1042 connected to each filter 1041 in one-to-one correspondence for inputting the radio frequency signal to the bridge 1043 according to the signal type.
The bridge 1043, connected to the first circulator 1042, is configured to combine the radio frequency signals with the same signal type, generate a radio frequency signal with a target bandwidth, and send the radio frequency signal to the antenna; the number of the filters and the number of the first circulators are both n, the number of the bridges is m, wherein m is n/2, and n is a positive integer greater than or equal to 2.
In an alternative embodiment of the present disclosure, the digital circuit 101 is specifically configured to: and combining the bandwidth values and the signal types of the multiple carrier signals to generate multiple target carrier signals, and performing signal format conversion on the multiple target carrier signals to obtain multiple paths of radio frequency signals.
As shown in fig. 6, the remote unit 100 further includes a second circulator 105, a first load 106, and a second load 107.
Each second circulator 105 is connected to each power amplifier module 103, and is configured to receive each path of radio frequency signal after power amplification and send the received radio frequency signal to each filter 1041.
Each pair of first circulators includes two first circulators 1042 connected to the same bridge 1043.
Each first load 106 is connected to one first circulator 1042 of each pair of first circulators.
Each second load 107 is connected to each second circulator 105.
In the embodiment of the present disclosure, as shown in fig. 5, the remote unit 100 includes a digital circuit 101, a radio frequency circuit 102, a power amplifier module 103, and a filtering integration module 104; the filtering integration module 104 includes a filter 1041, a first circulator 1042, and a bridge 1043, which are connected in sequence.
The electric bridge 1043 in the filtering integrated module 104 connected to the antenna is configured to obtain a radio frequency signal with a target bandwidth, and shunt the radio frequency signal to generate multiple radio frequency signals.
A first circulator 1042 connected to the bridge 1043 for inputting each rf signal to the filter 1041.
A filter 1041 connected to each first circulator 1042 for filtering each rf signal; the number of the filters 1041 and the number of the first circulators 1042 are both n, and the number of the bridges 1043 is m, where m is n/2, and n is a positive integer greater than or equal to 2.
And each power amplifier module 103 connected to each filter 1041, configured to perform power amplification on each filtered radio frequency signal.
And the radio frequency circuits 102 are connected with each power amplifier module 103 in a one-to-one correspondence manner and are used for receiving each path of radio frequency signals after power amplification and sending the radio frequency signals to the digital circuit 101.
And the digital circuit 101 is connected with each radio frequency circuit 102 and is used for performing signal format conversion on the multiple radio frequency signals, acquiring multiple carrier signals and transmitting the multiple carrier signals.
As shown in fig. 7, the remote unit 100 further includes a target filter 108, a radio frequency switch 109, and a third load 1010.
Wherein one circulator 1042 of the pair of first circulators connected to the bridge 1043 is connected to the target filter 108.
The rf switch 109 is connected to the target filter 108 in sequence, and the third load 1010 is connected to the rf switch 109 in sequence.
As an example, as shown in fig. 8, a specific implementation structure of the filtering integration module 104 ensures that each downlink rf port realizes a function of transmitting a signal with a target bandwidth, such as 300M. As shown in fig. 8 (300M is illustrated as two sets of signals 160M +140M in the diagram, in practical applications, the filter bandwidth may be designed according to the frequency band of a specific access operator, for example, the filter bandwidth may be further divided into front 150M + rear 150M, and the like): 3300MHz, bandwidth 300M.
More specifically, as shown in fig. 9 and 10, the filtering integration module 104 is connected to the power amplifier module 103,
therefore, the ANT1_ A, ANT1_ B, ANT2_ A, ANT2_ B in the graphs of FIGS. 8-10 are all 300M signal outputs, the channel of each path realizes the functions of standing wave detection and standing wave protection, and the standing waves of all nodes of each path are matched, so that the situation that the standing waves after combination are poor due to different frequency band bandwidths is avoided.
Based on the above embodiments, the embodiment of the present disclosure provides a remote transmission coverage system.
A specific implementation of the remote transmission overlay system will be described with reference to fig. 11-13.
As shown in fig. 11, the remote transmission coverage system includes: a proximal unit 100, an expansion unit 200 and a distal unit 300.
The near-end unit 100 is configured to receive a plurality of radio frequency signals sent by a plurality of base stations, amplify and frequency-convert the plurality of radio frequency signals through a radio frequency circuit in the near-end unit, perform signal format conversion on the amplified and frequency-converted radio frequency signals through a digital module in the near-end unit, generate a digital optical signal, and send the digital optical signal to the extension unit.
And the extension unit 200 is configured to generate a plurality of carrier signals according to the monitoring setting information and the preset protocol from the received digital optical signals of different channels, and distribute the carrier signals to different antenna ports of the remote unit.
The remote unit 300 is configured to receive multiple carrier signals, process the multiple carrier signals based on the multiple carrier signals, obtain multiple radio frequency signals, perform power amplification on the multiple radio frequency signals, filter the multiple radio frequency signals, combine the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generate a radio frequency signal with a target bandwidth, and send the radio frequency signal to an antenna.
In an embodiment of the present disclosure, as shown in fig. 11, the remote transmission coverage system includes: a proximal unit 100, an expansion unit 200 and a distal unit 300.
The remote unit 300 is configured to receive a radio frequency signal with a target bandwidth, input the radio frequency signal into a filtering integration module in the remote unit, shunt the radio frequency signal, generate multiple radio frequency signals, filter the multiple radio frequency signals, amplify power of the multiple radio frequency signals, perform signal format conversion on the multiple radio frequency signals after power amplification, obtain multiple carrier signals, and send the multiple carrier signals to the extension unit 200.
The extension unit 200 is configured to receive a plurality of carrier signals, analyze the plurality of carrier signals, and acquire a digital optical signal.
The near-end unit 100 is configured to receive the digital optical signal, perform format conversion on the digital optical signal, generate a radio frequency signal, process the radio frequency signal through a radio frequency circuit in the near-end unit 100, and send the radio frequency signal to a base station.
As shown in fig. 12, the remote transmission coverage system includes: a proximal unit 100 and a distal unit 300.
The near-end unit 100 is configured to receive multiple radio frequency signals sent by multiple base stations, amplify and frequency-convert the multiple radio frequency signals through a radio frequency circuit in the near-end unit, perform signal format conversion on the amplified and frequency-converted radio frequency signals through a digital module in the near-end unit 100, generate multiple carrier signals, and send the multiple carrier signals to the remote unit 300.
The remote unit 300 is configured to receive multiple carrier signals, process the multiple carrier signals based on the multiple carrier signals, obtain multiple radio frequency signals, perform power amplification on the multiple radio frequency signals, filter the multiple radio frequency signals, combine the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generate a radio frequency signal with a target bandwidth, and send the radio frequency signal to an antenna.
In an embodiment of the present disclosure, as shown in fig. 12, the remote transmission coverage system includes: a proximal unit 100 and a distal unit 300.
The remote unit 300 receives a radio frequency signal with a target bandwidth, inputs the radio frequency signal into a filtering integration module in the remote unit 300 to perform branching on the radio frequency signal, generates a plurality of radio frequency signals, performs filtering, performs power amplification on the filtered plurality of radio frequency signals, performs signal format conversion on the power-amplified plurality of radio frequency signals, obtains a plurality of carrier signals, and sends the plurality of carrier signals to the near-end unit 100.
The near-end unit 100 is configured to perform format conversion on the multiple carrier signals to generate multiple radio frequency signals, and send the radio frequency signals to the base station after processing the radio frequency signals by using a radio frequency circuit in the near-end unit 100.
As shown in fig. 13, the remote transmission coverage system includes: a remote unit 300 and a baseband processing unit 400.
A baseband processing unit 400 for generating a plurality of carrier signals.
The remote unit 300 is configured to receive multiple carrier signals, process the multiple carrier signals based on the multiple carrier signals, obtain multiple radio frequency signals, perform power amplification on the multiple radio frequency signals, filter the multiple radio frequency signals, combine the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generate a radio frequency signal with a target bandwidth, and send the radio frequency signal to an antenna.
In an embodiment of the present disclosure, as shown in fig. 13, the remote transmission coverage system includes: a remote unit 300 and a baseband processing unit 400.
The remote unit 300 receives a radio frequency signal with a target bandwidth, inputs the radio frequency signal into a filtering integration module in the remote unit 300 to perform branching on the radio frequency signal, generates a plurality of radio frequency signals, performs filtering, performs power amplification on the filtered plurality of radio frequency signals, performs signal format conversion on the power-amplified plurality of radio frequency signals, obtains a plurality of carrier signals, and sends the plurality of carrier signals to the baseband processing unit 400.
A baseband processing unit 400 for receiving a plurality of carrier signals.
Taking the system shown in fig. 11 as an example for illustration, as shown in fig. 14, the remote transmission coverage system includes a near-end unit 100, an extension unit 200, and a remote unit 300, where the near-end unit 100 and the extension unit 200, and the extension unit 200 and the remote unit 300 are connected by optical fibers, and multiple operator base stations are connected by multiple rf ports of the near-end unit 100 of the coupler.
More specifically, as shown in fig. 15, the rf signal output by the base station enters the near-end unit 100 through the coupler, undergoes rf amplification and frequency conversion, and then is converted into a digital intermediate frequency signal through an ADC (Analog-to-digital converter), and the digital intermediate frequency signal is further down-converted into a baseband signal, and then is low-pass filtered to achieve a required out-of-band rejection.
The processed signal data and the monitoring data are combined together and then framed according to a certain protocol (such as a CPRI protocol, an eccri protocol, etc.), the framed signal is sent to a relay terminal photoelectric conversion module to be converted into a digital optical signal, and is sent to the extension unit 200 through an optical fiber (where a baseband signal received by the extension unit 200 includes signals of all channels of the near-end unit 100), the extension unit 200 receives the digital optical signal sent by the near-end unit 100, converts the digital optical signal into an electrical signal through the photoelectric conversion module, and then decouples the frame to separate the signal data and the monitoring data.
The extension unit 200 distributes the received baseband signal information of different channels of the near-end unit 100 to the remote units 300 corresponding to different optical ports according to the monitoring setting information, and the specific transmission principle is similar to that when the near-end unit 100 transmits the baseband signal information to the extension unit 200, that is, the distributed signal data and the monitoring data are combined together and then framed according to a certain protocol (such as CPRI protocol, eccri protocol, etc.). The framed signals are sent to the photoelectric conversion module of the expansion unit 200 to be converted into digital optical signals, and then are sent to the remote unit 300 through optical fibers, the remote unit 300 receives the digital optical signals sent by the expansion unit 200, converts the digital optical signals into electric signals through the remote photoelectric conversion module, and then frames the electric signals to separate out signal data and monitoring data.
The signal data is processed by filtering and then is subjected to digital up-conversion to become a digital intermediate frequency signal, the digital intermediate frequency signal of the channel is transmitted to the ADC/DAC subsystem to be converted into an analog intermediate frequency signal through the setting selection of the channel, and the analog intermediate frequency signal is up-converted to a radio frequency signal by an up-conversion module (the current AD integrated chip has a local oscillation frequency mixing function and can directly complete the conversion of the digital signal into the radio frequency signal). The rf signal is power amplified by the power amplifier module 103, enters the filtering integration module 104 to recover to obtain a relatively pure rf signal, and then is transmitted to the coverage area by the antenna feeder system.
It should be noted that the working flow of the uplink is basically the same as that of the downlink, that is, after a spatial radio frequency signal is received by an antenna, the spatial radio frequency signal is filtered by the filtering integration module 104, and then enters the down-conversion module to convert the spatial radio frequency signal into an analog intermediate frequency signal, the ADC/DAC subsystem in the remote unit 300 is converted into a digital intermediate frequency signal, the baseband processing unit performs digital down-conversion and frequency-selective filtering and frequency shifting, the photoelectric conversion module converts the spatial radio frequency signal into a digital optical signal, the optical fiber performs optical path transmission to the extension unit 200, and the extension unit 200 combines all baseband signals connected to the optical port of the remote unit 300 and then converts the combined baseband signals into optical signals to be sent to the near-end unit 100 through the optical module.
The near-end unit 100 converts the photoelectric conversion module into a digital electrical signal, the baseband processing unit performs filtering and digital up-conversion into a digital intermediate frequency signal, the ADC/DAC subsystem converts the digital intermediate frequency signal into an analog intermediate frequency signal, the relay-end up-conversion module performs up-conversion into a radio frequency signal, and the recovered uplink radio frequency signal is directly transmitted to the base station radio frequency receiving unit through a coupler outside the near-end unit 100.
Specifically, the remote unit 300 performs radio frequency filtering (for example, bandwidth 300M) on, for example, 300M signals received by an antenna port in an uplink, performs radio frequency amplification to enter AD (Analog-to-digital, and after sampling, divides the 300M signals into 160M and 140M signals through an FPGA (Field Programmable Gate Array) digital filter, and transmits the signals from a base station operating frequency band connected to a radio frequency port of the corresponding near-end unit 100 through a downlink reverse path (where, the uplink does not relate to linear technical requirements such as power amplification and high-power amplification, and so on, and can generally implement signal transmission processing with bandwidth larger than the downlink, and if the reception of an AD chip does not support large bandwidth signal reception, a load can be changed to a filter (the filter has bandwidth of 300M) and a switch at an uplink output port of the circulator of the present application, and then an uplink radio frequency link is connected, or the functions of outputting 160M and 140M respectively for each channel in the following row and realizing 300M antenna receiving by combining) can be realized.
Therefore, the near-end unit 100 is designed with multiple channels, supports multiple operator signal access, and implements transmission of a target bandwidth, such as 300M baseband signals (300M signals are divided into 2 or more) to the extension unit 200 through FPGA filtering and combining, the extension unit 200 distributes multi-carrier signals to the remote unit 300 connected below, a digital module of the remote unit 300 sends signals of different carriers (such as carrier 1 is the front 160M signal, and carrier 2 is the rear 140M signal) to different corresponding AD radio frequency paths respectively for radio frequency amplification, such as 2 paths of radio frequency paths respectively amplify power of carrier 1 and carrier 2 signals, and then the signals enter the filtering integration module 104 for processing, and the filtering integration module 104 performs bridge processing (combining and power dividing) on the 2 paths of signals, and transmits external antennas, thereby implementing large-bandwidth signal transmission at an antenna port.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus 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, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present disclosure, which enable those skilled in the art to understand or practice the present disclosure. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the disclosure. Thus, the present disclosure is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (17)
1. A remote transmission coverage method applied to a remote unit includes:
receiving a plurality of carrier signals;
processing based on the plurality of carrier signals to obtain a plurality of paths of radio frequency signals;
the multi-channel radio frequency signals are subjected to power amplification and then input into a filtering integration module in the remote unit so as to be filtered, the filtered multi-channel radio frequency signals are combined based on the signal types of the multi-channel radio frequency signals, and radio frequency signals with target bandwidth are generated and sent to an antenna; the filtering integrated module comprises a filter, a circulator and an electric bridge which are sequentially connected.
2. The method according to claim 1, wherein the processing based on the plurality of carrier signals to obtain multiple rf signals comprises:
combining the bandwidth values and the signal types of the plurality of carrier signals to generate a plurality of target carrier signals;
and performing signal format conversion based on the plurality of target carrier signals to obtain the plurality of paths of radio frequency signals.
3. A remote transmission coverage method applied to a remote unit includes:
receiving a radio frequency signal of a target bandwidth;
inputting the radio frequency signal into a filtering integrated module in the remote unit to shunt the radio frequency signal, generating a plurality of paths of radio frequency signals, filtering, and performing power amplification on the filtered plurality of paths of radio frequency signals; the filtering integrated module comprises a filter, a circulator and an electric bridge which are sequentially connected;
and performing signal format conversion on the power-amplified multi-channel radio frequency signals to obtain a plurality of carrier signals and transmitting the carrier signals.
4. A remote unit, comprising:
the digital circuit is used for receiving a plurality of carrier signals, processing the carrier signals based on the carrier signals, acquiring a plurality of paths of radio frequency signals and respectively sending the signals to the radio frequency circuits;
the plurality of radio frequency circuits are connected with the digital circuit and used for sending the plurality of radio frequency signals to the corresponding power amplifier modules;
the power amplification modules are connected with the radio frequency circuits in a one-to-one correspondence manner and are used for carrying out power amplification on the multi-channel radio frequency signals;
the filtering integrated module is connected with the plurality of power amplification modules, comprises a filter, a first circulator and an electric bridge which are sequentially connected, is connected with each power amplification module in a one-to-one correspondence manner, and is used for filtering each path of radio frequency signals after power amplification;
the first circulators are connected with the filters in a one-to-one correspondence manner and used for inputting each path of radio frequency signal into the electric bridge according to the signal type;
the electric bridge is connected with the first circulator and is used for combining the radio-frequency signals with the same signal type to generate a radio-frequency signal with a target bandwidth and sending the radio-frequency signal to an antenna; the number of the filters and the number of the first circulators are both n, and the number of the bridges is m, wherein m is n/2, and n is a positive integer greater than or equal to 2.
5. The remote unit according to claim 4, wherein the digital circuit is specifically configured to:
combining the bandwidth values and the signal types of the plurality of carrier signals to generate a plurality of target carrier signals;
and performing signal format conversion based on the plurality of target carrier signals to obtain the plurality of paths of radio frequency signals.
6. The remote unit of claim 4, further comprising: a second circulator;
and each second circulator is respectively connected with each power amplification module and is used for receiving each path of radio frequency signal subjected to power amplification and sending the radio frequency signal to each filter.
7. A remote unit as defined in claim 4,
two first circulators connected to the same bridge constitute a pair of first circulators.
8. The remote unit of claim 7, further comprising: a first load;
each of the first loads is connected to one of the first circulators of each pair.
9. The remote unit of claim 6, further comprising: a second load;
each of the second loads is connected to each of the second circulators.
10. A remote unit, comprising:
the electric bridge in the filtering integrated module connected with the antenna is used for acquiring a radio frequency signal with a target bandwidth, and shunting the radio frequency signal to generate a plurality of paths of radio frequency signals;
the first circulator is connected with the bridge and is used for inputting each path of radio frequency signal into the filter;
the filters are connected with the first circulators in a one-to-one correspondence mode and used for filtering each path of radio frequency signals; the number of the filters and the number of the first circulators are both n, and the number of the bridges is m, wherein m is n/2, and n is a positive integer greater than or equal to 2;
each power amplification module connected with each filter is used for amplifying the power of each path of radio frequency signals after filtering;
the radio frequency circuits are connected with the power amplifier modules in a one-to-one correspondence mode and used for receiving each path of radio frequency signals after power amplification and sending the radio frequency signals to the digital circuit;
and the digital circuit is connected with each radio frequency circuit and is used for carrying out signal format conversion on the multi-channel radio frequency signals, acquiring a plurality of carrier signals and transmitting the carrier signals.
11. The remote unit according to claim 10, further comprising: the target filter, the radio frequency switch and the third load;
one first circulator in a pair of first circulators connected with the same bridge is connected with the target filter;
the radio frequency change-over switch is connected with the target filter in sequence, and the third load is connected with the radio frequency change-over switch in sequence.
12. A remote transmission coverage system, comprising: a proximal unit, an expansion unit and a remote unit according to any of claims 3-9;
the near-end unit is configured to receive multiple radio frequency signals sent by multiple base stations, amplify and frequency-convert the multiple radio frequency signals through a radio frequency circuit in the near-end unit, and perform signal format conversion on the amplified and frequency-converted radio frequency signals through a digital module in the near-end unit to generate digital optical signals, and send the digital optical signals to the extension unit;
the extension unit is used for generating a plurality of carrier signals according to the monitoring setting information and the received digital optical signals of different channels according to a preset protocol and distributing the carrier signals to different antenna ports of the remote unit;
the remote unit is used for receiving the carrier signals, processing the carrier signals based on the carrier signals to obtain multiple radio frequency signals, filtering the multiple radio frequency signals after power amplification of the multiple radio frequency signals, combining the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generating radio frequency signals with target bandwidth, and sending the radio frequency signals to an antenna.
13. A remote transmission coverage system, comprising: a proximal unit and a distal unit as defined in any of claims 3-9;
the near-end unit is configured to receive multiple radio frequency signals sent by multiple base stations, amplify and frequency-convert the multiple radio frequency signals through a radio frequency circuit in the near-end unit, and perform signal format conversion on the amplified and frequency-converted radio frequency signals through a digital module in the near-end unit to generate multiple carrier signals, and send the multiple carrier signals to the remote unit;
the remote unit is used for receiving the carrier signals, processing the carrier signals based on the carrier signals to obtain multiple radio frequency signals, filtering the multiple radio frequency signals after power amplification of the multiple radio frequency signals, combining the filtered multiple radio frequency signals based on the signal types of the multiple radio frequency signals, generating radio frequency signals with target bandwidth, and sending the radio frequency signals to an antenna.
14. A remote transmission coverage system, comprising: a baseband processing unit and a remote unit according to any of claims 3-9;
the baseband processing unit is used for generating a plurality of carrier signals;
the remote unit is used for receiving a plurality of carrier signals, processing based on the carrier signals to obtain a plurality of paths of radio frequency signals, filtering the plurality of paths of radio frequency signals after power amplification of the plurality of paths of radio frequency signals, combining the filtered plurality of paths of radio frequency signals based on the signal types of the plurality of paths of radio frequency signals, generating a radio frequency signal with a target bandwidth, and sending the radio frequency signal to an antenna.
15. A remote transmission coverage system, comprising: a proximal unit, an expansion unit and a distal unit according to claim 10 or 12;
the remote unit is configured to receive a radio frequency signal with a target bandwidth, input the radio frequency signal into a filtering integration module in the remote unit, shunt the radio frequency signal, generate multiple radio frequency signals, filter the multiple radio frequency signals, amplify power of the multiple radio frequency signals after filtering, perform signal format conversion on the multiple radio frequency signals after power amplification, acquire multiple carrier signals, and send the multiple carrier signals to the extension unit;
the extension unit is used for receiving the plurality of carrier signals, analyzing the plurality of carrier signals and acquiring digital optical signals;
and the near-end unit is used for receiving the digital optical signal, performing format conversion on the digital optical signal to generate a radio frequency signal, processing the radio frequency signal through a radio frequency circuit in the near-end unit, and then sending the radio frequency signal to a base station.
16. A remote transmission coverage system, comprising: a proximal unit and a distal unit as defined in claim 10 or 12;
the remote unit receives a radio frequency signal with a target bandwidth, inputs the radio frequency signal into a filtering integration module in the remote unit to shunt the radio frequency signal, generates a plurality of paths of radio frequency signals, then carries out filtering, carries out power amplification on the filtered plurality of paths of radio frequency signals, carries out signal format conversion on the power-amplified plurality of paths of radio frequency signals, acquires a plurality of carrier signals and sends the carrier signals to the near-end unit;
and the near-end unit is used for performing format conversion on the plurality of carrier signals to generate a plurality of radio frequency signals, and processing the radio frequency signals through a radio frequency circuit in the near-end unit and then sending the radio frequency signals to a base station.
17. A remote transmission coverage system, comprising: a baseband processing unit and a remote unit according to claim 10 or 12;
the remote unit receives a radio frequency signal with a target bandwidth, inputs the radio frequency signal into a filtering integration module in the remote unit to shunt the radio frequency signal, generates a plurality of paths of radio frequency signals, then carries out filtering, carries out power amplification on the filtered plurality of paths of radio frequency signals, carries out signal format conversion on the power-amplified plurality of paths of radio frequency signals, acquires a plurality of carrier signals and sends the carrier signals to the baseband processing unit;
the baseband processing unit is configured to receive the plurality of carrier signals.
Priority Applications (2)
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| CN202111162567.5A CN113938140A (en) | 2021-09-30 | 2021-09-30 | Remote transmission covering method, system and remote unit |
| PCT/CN2021/133732 WO2023050551A1 (en) | 2021-09-30 | 2021-11-26 | Remote transmission coverage method and system, and remote unit |
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| CN202111162567.5A CN113938140A (en) | 2021-09-30 | 2021-09-30 | Remote transmission covering method, system and remote unit |
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