CN112533282B - Frequency synchronization method and system, near-end machine, far-end machine and storage medium - Google Patents
Frequency synchronization method and system, near-end machine, far-end machine and storage medium Download PDFInfo
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- CN112533282B CN112533282B CN202011139754.7A CN202011139754A CN112533282B CN 112533282 B CN112533282 B CN 112533282B CN 202011139754 A CN202011139754 A CN 202011139754A CN 112533282 B CN112533282 B CN 112533282B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0008—Synchronisation information channels, e.g. clock distribution lines
Abstract
The present disclosure relates to a frequency synchronization method and system, a near-end unit, a far-end unit, and a storage medium. The frequency synchronization method comprises the following steps: the method comprises the steps that a first communication system and a second communication system in an indoor distribution system are in co-cable transmission, wherein the first communication system directly transmits, and the second communication system transmits after frequency shift; the second communication system extracts the synchronization frequency from the first communication system at the remote and near-end units. The present disclosure may utilize a first communication system transmitting over a cable to provide a synchronized clock for a second communication system.
Description
Technical Field
The present disclosure relates to the field of mobile communications, and in particular, to a frequency synchronization method and system, a near-end device, a far-end device, and a storage medium.
Background
In a frequency shift repeater system, a far-end machine and a near-end machine need frequency synchronization, and the current synchronization method in the related technology mainly comprises the following steps: in the first mode, the local free oscillation is realized, and high-stability crystal oscillators are adopted at the far end and the near end respectively; the first way is to pass the local or intermediate frequency signal of the near-end machine to the far-end machine.
Disclosure of Invention
The inventor finds out through research that: in the related technology, the local free oscillation and the far and near ends respectively adopt a high-stability crystal oscillator mode, so that the cost is high; in the related art, in a manner of transmitting the local oscillator or the intermediate frequency signal of the near-end unit to the far-end unit, the far-end unit obtains that the local oscillator phase noise performance is not good or the far-end unit needs an extra feeder line to transmit the local oscillator or the intermediate frequency signal.
In view of at least one of the above technical problems, the present disclosure provides a frequency synchronization method and system, a near-end unit, a far-end unit, and a storage medium, which provide a synchronized clock for a second communication system using a first communication system transmitting on a same cable.
According to an aspect of the present disclosure, there is provided a frequency synchronization method, including:
the method comprises the steps that a first communication system and a second communication system in an indoor distribution system are in co-cable transmission, wherein the first communication system directly transmits, and the second communication system transmits after frequency shift;
the second communication system extracts the synchronization frequency from the first communication system at the remote and near-end units.
In some embodiments of the present disclosure, the first communication system is a 4G system and the second communication system is a 5G system.
According to another aspect of the present disclosure, there is provided a frequency synchronization method including:
the method comprises the steps that a first communication system and a second communication system in a repeater system are in co-cable transmission, wherein the first communication system is used for direct transmission, and the second communication system is used for transmission after frequency shift;
the second communication system extracts the synchronization frequency from the first communication system at the remote and near-end units.
In some embodiments of the present disclosure, the first communication system is a 4G system and the second communication system is a 5G system.
According to another aspect of the present disclosure, there is provided a near-end unit, which is a near-end unit of an indoor distribution system or a repeater system, wherein:
the method comprises the following steps that a first communication system and a second communication system are in co-cable transmission in an indoor distribution system or a repeater system, wherein the first communication system is used for direct transmission, and the second communication system is used for transmission after frequency shift;
the near-end machine comprises a near-end machine communication module, wherein:
the near-end machine communication module is a second communication system communication module and is used for extracting the synchronous frequency from the first communication system.
In some embodiments of the present disclosure, the first communication system is a 4G system and the second communication system is a 5G system.
According to another aspect of the present disclosure, there is provided a remote machine which is a remote machine of an indoor distribution system or a repeater system, wherein:
the method comprises the following steps that a first communication system and a second communication system are in co-cable transmission in an indoor distribution system or a repeater system, wherein the first communication system is used for direct transmission, and the second communication system is used for transmission after frequency shift;
the remote machine includes a remote machine communication module, wherein:
the remote machine communication module is a second communication system communication module and is used for extracting synchronous frequency from the first communication system.
In some embodiments of the present disclosure, the first communication system is a 4G system and the second communication system is a 5G system.
According to another aspect of the present disclosure there is provided an indoor distribution system comprising a near-end machine as described in any one of the above embodiments and a far-end machine as described in any one of the above embodiments.
In some embodiments of the present disclosure, the indoor distribution system is a frequency shift multi-system passive indoor distribution system.
According to another aspect of the present disclosure, there is provided a repeater system comprising a near-end machine as described in any of the above embodiments and a far-end machine as described in any of the above embodiments.
In some embodiments of the present disclosure, the repeater system is a frequency shift repeater system.
According to another aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, which when executed by a processor, implement the frequency synchronization method according to any of the above embodiments.
The present disclosure may utilize a first communication system transmitting over a cable to provide a synchronized clock for a second communication system.
Drawings
In order to more clearly illustrate the embodiments of the present disclosure or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of some embodiments of a frequency synchronization method of the present disclosure.
Fig. 2 is a schematic diagram of another embodiment of a frequency synchronization method according to the present disclosure.
Fig. 3 is a schematic diagram of some embodiments of a near-end machine of the present disclosure.
Fig. 4 is a schematic diagram of some embodiments of an indoor distribution system of the present disclosure.
Detailed Description
The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure, and it is obvious that the described embodiments are only a part of the embodiments of the present disclosure, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the disclosure, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.
The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present disclosure unless specifically stated otherwise.
Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
Fig. 1 is a schematic diagram of some embodiments of a frequency synchronization method of the present disclosure. Preferably, this embodiment is performed by both the near-end machine and the far-end machine of the present disclosure. The method may comprise the steps 11 and 12, wherein:
and 11, carrying out co-cable transmission on a first communication system and a second communication system in the indoor distribution system, wherein the first communication system carries out direct transmission, and the second communication system carries out transmission after frequency shift.
In some embodiments of the present disclosure, the first communication system may be a 4G system and the second communication system may be a 5G system.
In some embodiments of the present disclosure, the indoor distribution system is a frequency shift multi-system passive indoor distribution system.
In some embodiments of the present disclosure, in the passive indoor subsystem, a plurality of systems are transmitted by a cable, for example, 4G and 5G systems share a single feed cable, wherein 4G is directly transmitted and 5G is transmitted after frequency shift.
The second communication system extracts the synchronized frequency from the first communication system at the remote and near-end units, whereby the frequencies of the second communication system at the remote and near-end units can be synchronized in time slots, step 12.
In the above embodiments of the present disclosure, the second communication system extracts the synchronization frequency from the first communication system at both the remote end and the near end, and the two can be considered to be approximately the same source.
Based on the frequency synchronization method provided by the above embodiments of the present disclosure, no additional feeder cable is required to be added between the remote station and the near-end station to transmit the frequency synchronization signal.
The above embodiments of the present disclosure utilize a first communication system transmitting with a cable to provide a synchronized clock for a second communication system.
The frequency synchronization signal of the above embodiment of the present disclosure is generated by a local terminal chip, and has no loss and interference in the transmission process and excellent phase noise performance.
In the above embodiment of the present disclosure, the frequency shift of 5G requires providing local oscillators at the near-end device and the far-end device, and the above embodiment of the present disclosure uses the communication terminal chip to extract the synchronous clock signal in the 4G network and provide the synchronous clock signal to the near-end device and the far-end device for use.
Fig. 2 is a schematic diagram of another embodiment of a frequency synchronization method according to the present disclosure. Preferably, this embodiment is performed by both the near-end machine and the far-end machine of the present disclosure. The method may comprise the steps 21 and 22, wherein:
and step 21, carrying out co-cable transmission on a first communication system and a second communication system in the repeater system, wherein the first communication system carries out direct transmission, and the second communication system carries out transmission after frequency shift.
In some embodiments of the present disclosure, the first communication system may be a 4G system and the second communication system may be a 5G system.
In some embodiments of the present disclosure, the repeater system is a frequency shift repeater system.
In some embodiments of the present disclosure, in a repeater system, multiple systems share a cable for transmission, for example, 4G and 5G systems share a single feed cable for transmission, where 4G is directly transmitted and 5G is transmitted after frequency shift.
The second communication system extracts the synchronized frequency from the first communication system at the remote and near-end units, step 22, whereby the frequencies of the second communication system at the remote and near-end units can be synchronized in time slots.
In the above embodiments of the present disclosure, the far-end unit and the near-end unit of the second communication system extract the synchronization frequency from the first communication system, and the far-end unit and the near-end unit can be considered to be approximately the same source.
Based on the frequency synchronization method provided by the above embodiments of the present disclosure, no additional feeder cable is required to be added between the remote station and the near-end station to transmit the frequency synchronization signal.
The above embodiments of the present disclosure utilize a first communication system transmitting with a cable to provide a synchronized clock for a second communication system.
The frequency synchronization signal of the above embodiment of the present disclosure is generated by a local terminal chip, and has no loss and interference in the transmission process and excellent phase noise performance.
In the above embodiment of the present disclosure, the frequency shift of 5G requires providing local oscillators at the near-end device and the far-end device, and the above embodiment of the present disclosure uses the communication terminal chip to extract the synchronous clock signal in the 4G network and provide the synchronous clock signal to the near-end device and the far-end device for use.
Fig. 3 is a schematic diagram of some embodiments of a near-end machine of the present disclosure. As shown in fig. 3, the near-end machine 31 may include a near-end machine communication module 311, wherein:
the near-end communication module 311 is a second communication system communication module.
The near-end communication module 311 is configured to extract a synchronization frequency from the first communication system.
In some embodiments of the present disclosure, the near-end unit 31 may be a near-end unit of an indoor distribution system or a repeater system.
In some embodiments of the present disclosure, as shown in fig. 3, the near-end machine 31 may be a near-end machine of an indoor distribution system.
In some embodiments of the present disclosure, the first communication system and the second communication system are co-cabled for transmission in an indoor distribution system or a repeater system, wherein the first communication system transmits directly, and the second communication system transmits after frequency shift.
In some embodiments of the present disclosure, as shown in fig. 3, the first communication system is a 4G system and the second communication system is a 5G system.
Fig. 3 is a schematic diagram also illustrating some embodiments of the remote units of the present disclosure. As shown in fig. 3, the remote machine 32 may include a remote machine communication module 321, wherein:
the remote-machine communication module 321 is a second communication system communication module.
The remote communication module 321 is configured to extract a synchronization frequency from the first communication system.
In some embodiments of the present disclosure, the remote machine 32 may be a remote machine of an indoor distribution system or a repeater system.
In some embodiments of the present disclosure, as shown in fig. 3, the remote machine 32 may be a remote machine of an indoor distribution system.
Fig. 3 is a schematic diagram also illustrating some embodiments of the indoor distribution system of the present disclosure. As shown in fig. 3, the indoor distribution system of the present disclosure may include a near-end machine 31 and a far-end machine 32, wherein:
the near-end machine 31 may be a near-end machine as described in any of the above embodiments.
The distal machine 32 may be a distal machine as described in any of the embodiments above.
In some embodiments of the present disclosure, the indoor distribution system may be a frequency shift multi-system passive indoor distribution system.
In some embodiments of the present disclosure, as shown in fig. 3, the indoor distribution system of the present disclosure may further include an indoor subsystem feeder cable 33, wherein the indoor subsystem feeder cable 33 is used to connect the near-end unit 31 and the far-end unit 32.
In the above-described embodiment of the present disclosure, the far-end unit communication module 321 and the near-end unit communication module 311 both extract the synchronization frequency from the first communication system (4G system), and may be considered to be approximately homologous.
In some embodiments of the present disclosure, as shown in fig. 3, the synchronous frequencies extracted by the far-end machine communication module 321 and the near-end machine communication module 311 from the first communication system (4G system) are both 26 MHz.
Based on the indoor distribution system provided by the above embodiments of the present disclosure, no additional feeder cable is required to transmit the frequency synchronization signal between the remote terminal and the near-end unit.
The indoor distribution system of the above embodiments of the present disclosure provides a synchronous clock for the second communication system by using the first communication system transmitting through the same cable.
The frequency synchronization signal of the above embodiment of the present disclosure is generated by a local terminal chip, and has no loss and interference in the transmission process and excellent phase noise performance.
The 5G frequency shift of the indoor distribution system in the above embodiment of the present disclosure requires providing local oscillators at the near-end device and the far-end device, and the above embodiment of the present disclosure extracts synchronous clock signals in the 4G network by using the communication terminal chip and provides the synchronous clock signals to the near-end device and the far-end device for use.
Fig. 4 is a schematic diagram of some embodiments of an indoor distribution system of the present disclosure. As shown in fig. 4, the indoor distribution system of the present disclosure may include a near-end machine 41 and a far-end machine 42, wherein:
as shown in fig. 4, the near-end machine 41 may include a near-end machine communication module 411, wherein:
the near-end communication module 411 is a second communication system communication module.
The near-end communication module 411 is configured to extract a synchronization frequency from the first communication system.
In some embodiments of the present disclosure, the near-end unit 41 may be a near-end unit of an indoor distribution system or a repeater system.
In some embodiments of the present disclosure, as shown in fig. 3, the near-end unit 41 may be a near-end unit of an indoor distribution system.
In some embodiments of the present disclosure, the first communication system and the second communication system are co-cabled for transmission in an indoor distribution system or a repeater system, wherein the first communication system transmits directly, and the second communication system transmits after frequency shift.
In some embodiments of the present disclosure, as shown in fig. 4, the first communication system is a 4G system and the second communication system is a 5G system.
As shown in fig. 4, the remote machine 42 may include a remote machine communication module 421, wherein:
the remote communication module 421 is a second communication system communication module.
The remote communication module 421 is configured to extract a synchronization frequency from the first communication system.
In some embodiments of the present disclosure, the remote unit 42 may be a remote unit of an indoor distribution system or a repeater system.
In some embodiments of the present disclosure, as shown in fig. 4, the remote unit 42 may be a remote unit of an indoor distribution system.
In some embodiments of the present disclosure, as shown in fig. 4, the indoor distribution system of the present disclosure may further include a passive distribution system 43 and a cloud server 44, wherein:
a passive distribution system 43 for connecting the near-end machine 41 and the far-end machine 42.
In some embodiments of the present disclosure, the near-end device 41 may further include a plug-in 5G terminal module, where the 5G Modem shown in fig. 4 is the plug-in 5G terminal module.
In some embodiments of the present disclosure, the near-end unit 41 and the far-end unit 42 each include a frequency shift device, wherein the frequency shift device is configured to shift the frequency of the 5G signal for transmission.
In some embodiments of the present disclosure, as shown in fig. 4, the frequency shifting devices in the near end unit 41 and the far end unit 42 may include mixers M1 and M2, where LO1 and LO2 are eigenfrequencies and IF1 and IF2 are intermediate frequencies, where mixer M1 is configured to mix the 5G radio frequency signal with the eigenfrequency LO1 and output an intermediate frequency signal IF 1; the mixer M2 is used to mix the 5G rf signal with the eigenfrequency LO2 and output an intermediate frequency signal IF2, thereby shifting the frequency of the timeslot 5G signal.
In some embodiments of the present disclosure, as shown in fig. 4, the near-end machine 41 may further include a combiner, and the far-end machine 42 may further include a coupler, wherein: the combiner and the coupler are used for coupling and transmitting the 5G signal and the 2G/3G/4G signal after frequency shift.
In some embodiments of the present disclosure, a 2G/3G/4G system and a 5G system exist simultaneously in the frequency-shifted multi-system indoor distribution system, the 2G/3G/4G signal is directly transmitted, and the 5G signal is transmitted after frequency shifting.
The indoor distribution system provided by the above embodiments of the present disclosure does not need to add an additional feeder cable between the remote unit and the near-end unit to transmit the frequency synchronization signal.
The indoor distribution system of the above embodiments of the present disclosure provides a synchronous clock for the second communication system by using the first communication system transmitting through the same cable.
The frequency synchronization signal of the above embodiment of the present disclosure is generated by a local terminal chip, and has no loss and interference in the transmission process and excellent phase noise performance.
The 5G frequency shift of the indoor distribution system in the above embodiment of the present disclosure requires providing local oscillators at the near-end device and the far-end device, and the above embodiment of the present disclosure extracts synchronous clock signals in the 4G network by using the communication terminal chip and provides the synchronous clock signals to the near-end device and the far-end device for use.
According to another aspect of the present disclosure, there is provided a repeater system including a near-end machine as described in any of the above embodiments (e.g., the embodiment of fig. 3 or fig. 4) and a far-end machine as described in any of the above embodiments (e.g., the embodiment of fig. 3 or fig. 4).
In some embodiments of the present disclosure, the repeater system may be a frequency shift repeater system.
In the above embodiments of the present disclosure, the second communication system extracts the synchronization frequency from the first communication system at both the remote end and the near end, and the two can be considered to be approximately the same source.
Based on the repeater system provided by the above embodiment of the present disclosure, no extra feeder cable is required to be added between the remote end machine and the near-end machine to transmit the frequency synchronization signal.
The above embodiments of the present disclosure utilize a first communication system transmitting with a cable to provide a synchronized clock for a second communication system.
The frequency synchronization signal of the above embodiment of the present disclosure is generated by a local terminal chip, and has no loss and interference in the transmission process and excellent phase noise performance.
In the above embodiment of the present disclosure, the frequency shift of 5G requires providing local oscillators at the near-end device and the far-end device, and the above embodiment of the present disclosure uses the communication terminal chip to extract the synchronous clock signal in the 4G network and provide the synchronous clock signal to the near-end device and the far-end device for use.
According to another aspect of the present disclosure, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, which when executed by a processor, implement the frequency synchronization method according to any one of the embodiments described above (e.g., the embodiment of fig. 1 or fig. 1).
Based on the computer readable storage medium provided by the above embodiments of the present disclosure, a first communication system transmitting through a same cable is used to provide a synchronous clock for a second communication system.
The above embodiments of the present disclosure do not require an additional feed cable between the remote end unit and the near-end unit to transmit the frequency synchronization signal.
The frequency synchronization signal of the above embodiment of the present disclosure is generated by a local terminal chip, and has no loss and interference in the transmission process and excellent phase noise performance.
In the above embodiment of the present disclosure, the frequency shift of 5G requires providing local oscillators at the near-end device and the far-end device, and the above embodiment of the present disclosure uses the communication terminal chip to extract the synchronous clock signal in the 4G network and provide the synchronous clock signal to the near-end device and the far-end device for use.
The remote and near-end machines described above may be implemented as a general purpose processor, a Programmable Logic Controller (PLC), a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Field Programmable Gate Array (FPGA) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any suitable combination thereof, for performing the functions described herein.
Thus far, the present disclosure has been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.
It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware to implement the above embodiments, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk, an optical disk, or the like.
The description of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the disclosure in the form disclosed. Many modifications and variations will be apparent to practitioners skilled in this art. The embodiment was chosen and described in order to best explain the principles of the disclosure and the practical application, and to enable others of ordinary skill in the art to understand the disclosure for various embodiments with various modifications as are suited to the particular use contemplated.
Claims (13)
1. A method of frequency synchronization, comprising:
the method comprises the steps that a first communication system and a second communication system are in co-cable transmission in an indoor distribution system, wherein the first communication system is used for direct transmission, the second communication system is used for transmission after frequency shift, and the indoor distribution system comprises a far-end machine and a near-end machine;
the second communication system extracts the synchronous frequency from the first communication system at the far-end machine and the near-end machine to realize the frequency synchronization of the second communication system at the far-end machine and the near-end machine, wherein the far-end machine supports the first communication system and the second communication system, and the near-end machine supports the first communication system and the second communication system.
2. The frequency synchronization method of claim 1,
the first communication system is a 4G system, and the second communication system is a 5G system.
3. A method of frequency synchronization, comprising:
the method comprises the steps that a first communication system and a second communication system in a repeater system are in co-cable transmission, wherein the first communication system is used for direct transmission, the second communication system is used for transmission after frequency shift, and the repeater system comprises a far-end machine and a near-end machine;
the second communication system extracts the synchronous frequency from the first communication system at the far-end machine and the near-end machine to realize the frequency synchronization of the second communication system at the far-end machine and the near-end machine, wherein the far-end machine supports the first communication system and the second communication system, and the near-end machine supports the first communication system and the second communication system.
4. The frequency synchronization method of claim 3,
the first communication system is a 4G system, and the second communication system is a 5G system.
5. A near-end machine, wherein the near-end machine is a near-end machine of an indoor distribution system or a repeater system, wherein:
the method comprises the following steps that a first communication system and a second communication system are in co-cable transmission in an indoor distribution system or a repeater system, wherein the first communication system is used for direct transmission, and the second communication system is used for transmission after frequency shift;
the near-end machine comprises a near-end machine communication module, wherein:
the near-end machine communication module is a second communication system communication module and is used for extracting synchronous frequency from the first communication system;
the indoor distribution system or the repeater system comprises a far-end machine and a near-end machine, wherein the far-end machine supports a first communication system and a second communication system, the near-end machine supports the first communication system and the second communication system, the far-end machine comprises a far-end machine communication module, and the far-end machine communication module is a second communication system communication module and is used for extracting synchronous frequency from the first communication system so as to realize frequency synchronization of the second communication system at the far-end machine and the near-end machine.
6. The near-end machine of claim 5,
the first communication system is a 4G system, and the second communication system is a 5G system.
7. A remote unit, wherein the remote unit is a remote unit of an indoor distribution system or a repeater system, wherein:
the method comprises the following steps that a first communication system and a second communication system are in co-cable transmission in an indoor distribution system or a repeater system, wherein the first communication system is used for direct transmission, and the second communication system is used for transmission after frequency shift;
the remote machine includes a remote machine communication module, wherein:
the remote terminal communication module is a second communication system communication module and is used for extracting synchronous frequency from the first communication system;
the indoor distribution system or the repeater system comprises a far-end machine and a near-end machine, wherein the far-end machine supports a first communication system and a second communication system, the near-end machine supports the first communication system and the second communication system, the near-end machine comprises a near-end machine communication module, and the near-end machine communication module is a second communication system communication module and is used for extracting synchronous frequency from the first communication system so as to realize frequency synchronization of the second communication system at the far-end machine and the near-end machine.
8. The remote machine of claim 7,
the first communication system is a 4G system, and the second communication system is a 5G system.
9. An indoor distribution system comprising a near-end machine as claimed in claim 5 or 6 and a far-end machine as claimed in claim 7 or 8.
10. The indoor distribution system of claim 9,
the indoor distribution system is a frequency shift multi-system passive indoor distribution system.
11. A repeater system comprising a near end machine according to claim 5 or 6 and a far end machine according to claim 7 or 8.
12. The repeater system according to claim 11,
the repeater system is a frequency shift repeater system.
13. A computer-readable storage medium storing computer instructions which, when executed by a processor, implement the frequency synchronization method of any one of claims 1-4.
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| PCT/CN2021/124410 WO2022083543A1 (en) | 2020-10-22 | 2021-10-18 | Frequency synchronization method, systems, near-end machine, far-end machine and storage medium |
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| CN113132494B (en) * | 2021-04-29 | 2022-09-02 | 陕西天基通信科技有限责任公司 | Remote upgrading method and system |
| CN113259010A (en) * | 2021-05-20 | 2021-08-13 | 罗文松 | Optical transceiver access system based on multiple systems |
| CN114786250B (en) * | 2022-04-24 | 2023-08-18 | 中国电信股份有限公司 | Data signal transmission method and device, storage medium and electronic equipment |
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