CN105515710B - A kind of method and apparatus for realizing time synchronization - Google Patents
A kind of method and apparatus for realizing time synchronization Download PDFInfo
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- CN105515710B CN105515710B CN201610035122.3A CN201610035122A CN105515710B CN 105515710 B CN105515710 B CN 105515710B CN 201610035122 A CN201610035122 A CN 201610035122A CN 105515710 B CN105515710 B CN 105515710B
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- base station
- rru
- synchrodata
- optical fiber
- interconnecting module
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W56/00—Synchronisation arrangements
- H04W56/001—Synchronization between nodes
- H04W56/0015—Synchronization between nodes one node acting as a reference for the others
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0638—Clock or time synchronisation among nodes; Internode synchronisation
- H04J3/0658—Clock or time synchronisation among packet nodes
- H04J3/0661—Clock or time synchronisation among packet nodes using timestamps
- H04J3/0667—Bidirectional timestamps, e.g. NTP or PTP for compensation of clock drift and for compensation of propagation delays
Abstract
The invention discloses a kind of method of time synchronization and base station systems, it include: master unit, at least one radio frequency unit and between master unit and at least one described radio frequency unit transmit information optical fiber, the base station system further include: configure in one end close at least one radio frequency unit or the clock sync server integrated at least one described radio frequency unit, affiliated clock sync server is used for by transmitting synchrodata between the optical fiber and master unit so that the master unit, which carries out configuration according to the synchrodata, handles the time synchronization realized with clock sync server.The scheme provided through the invention can make the time synchronization of master unit Yu clock sync server, so that the selection of the master unit website of system is more flexible and convenient, equipment is simple and low in cost.
Description
Technical field
The present invention relates to the method and apparatus that time synchronization is realized in the communications field more particularly to a kind of communication system.
Background technique
In mobile communication system, base station is component part important in mobile communications network, is used for transmitting/receiving wireless signal,
User terminal (user equipment, UE) is set to access wireless network.
The base station system of existing communication network has different networking solutions, for example, base station can be set in single position
It sets, the baseband portion of base station and radio frequency part can also be set up separately in different location (distributed structure/architecture base station).For distribution
Formula framework base station, the i.e. baseband portion and radio frequency part of base station separate, and the distance between baseband circuit and radio circuit can phases
To shorter；It is also possible to main-remote design framework, setting is zoomed out into relative to the baseband portion of master unit in radio frequency unit part.
Master unit (MU) executes the processing of baseband signal, and master unit may include one or more baseband control unit (baseband
Control unit, BBU), and one or more radio frequency units (remote radio unit, RRU) are between base band and radio frequency
Conversion is executed, and is sent and received signal on one or more antennas.Each RRU services some geographic area or cell, leads to
Cross interface unit and BBU transmission uplink/downlink base band data and major state information.For time division synchronous (Time Division
Duplex, TDD) system, because base station sends and receives to be needed to keep using identical frequency range to avoid interfering with each other between base station
Time synchronization between base station.
It is in the prior art by global position system (such as global positioning for traditional base station
System, GPS system, Beidou satellite system or Galileo system etc.) realize time synchronization.But for distributed structure/architecture base
For standing, BBU and RRU are configured separates, if all installing global position system in BBU and RRU, not only system architecture is complicated,
Also system cost is considerably increased.
Summary of the invention
The embodiment of the present invention provides the method and base station system of a kind of simple achievable time synchronization.
Technical solution in the embodiment of the present invention is achieved in that
One aspect of the present invention provides a kind of base station system, comprising: master unit MU, at least one radio frequency unit and for
The optical fiber of information, the base station system are transmitted between MU and at least one described radio frequency unit further include:
Clock sync server, for by transmitting synchrodata between the optical fiber and MU so that the MU is according to institute
The time synchronization that synchrodata carries out configuration processing realization and clock sync server is stated, the clock sync server configuration exists
One end of at least one radio frequency unit described in is integrated at least one described radio frequency unit.
Another aspect of the present invention provides the method for synchronizing time in a kind of distributed structure/architecture base station system, the system comprises
Master unit MU, at least one radio frequency unit and the light for transmitting information between MU and at least one described radio frequency unit
It is fine, it is characterised in that:
Close at least one described radio frequency unit one end setup time sync server, the time synchronization server is logical
It crosses between the optical fiber and the MU and transmits synchrodata；
The MU carries out the time synchronization of configuration processing realization and clock sync server according to the synchrodata.
Scheme provided in an embodiment of the present invention, by close to radio frequency unit one end or in radio frequency unit integrate when
Clock sync server, and by the transmission of the synchrodata between optical fiber realization clock synchronizer and MU, so that MU and clock
The time synchronization of sync server, so that the selection of the MU website of system is more flexible and convenient, equipment is simple and low in cost.
Detailed description of the invention
Figure 1A -1C is the different configuration of structural schematic diagram of base station system；
Fig. 2 is the base station system network structural schematic diagram of first embodiment of the invention；
Fig. 3 is the base station system network structural schematic diagram of second embodiment of the invention；
Fig. 4 is the base station system network structural schematic diagram of third embodiment of the invention.
Specific embodiment
The embodiment of the present invention is discussed in detail below in conjunction with attached drawing.In the following description, in order to illustrate rather than limit this hair
Bright purpose proposes some details, such as specific embodiment, operating process, technology etc., to have to the present invention
Thorough understanding.But to those skilled in the art, the present invention obviously can also be not limited to other of these specific details
Embodiment is implemented.Although radio frequency unit is equal for example, it is that example describes that the present invention, which is the base station system based on distributed structure/architecture,
Illustrate by taking the remote radio unit (RRU) RRU of the distributed structure/architecture base station of main-remote design as an example, but the present invention is not limited to realities
The distributed structure/architecture base station for applying main-remote design described in example can be adapted for any distributed structure/architecture base station, such as base
The radio frequency unit stood is also possible to proximal end radio frequency unit, for another example, the radio frequency unit of base station can a part be proximal end radio frequency unit,
A part is the mixed type framework of remote radio unit (RRU).Data between radio frequency unit and master unit of the invention are transmitted with optical fiber
For be illustrated, but the present invention is not limited thereto, when between radio frequency unit and master unit can also by cable etc. other
Transmission medium, which is connected, to carry out data transmission.Base station system structure have any quantity can be only fitted to it is any can be with optical fiber circuit coupling
Close the remote unit in the network topology of at least one RRU.The present invention may be also used in any system using hybrid base
In.Although some using single optical fiber circuit in following example, the present invention can also use the coupled configuration of multifiber
In.
In certain embodiments, well known method, interface, equipment signaling technology are not specifically described, Yi Mianyin
Unnecessary details makes the present invention fuzzy.Furthermore each individual functional module is shown in certain attached drawings.The technology of this field
Personnel are appreciated that these functions can be realized in the following way: individual hardware circuit, cooperate properly programmed number micro-
Processor or the software of general purpose computer operation, specific integrated circuit (ASIC) and/or one or more digital signal processors
(DSP)。
Figure 1A to 1C shows the different configuration of structure of base station system.Base station may include master unit MU and at least one
It include at least one Base Band Unit BBU in remote radio unit (RRU) RRU, master unit MU.It such as is star-like connection shown in Figure 1A
Configuration structure, master unit are connected by optical fiber respectively with multiple remote radio unit (RRU) RRU.Again as shown in fig. 1b, MU with it is multiple
It is connected between RRU by chain, adjacent RRU is cascaded.Again as shown in Figure 1 C, by ring-like between MU and multiple RRU
Mode.There are also other configuration modes, such as MU and RRU are logical by the MU and RRU of base station system known to those skilled in the art
Cross the transmission mediums such as cable carry out be connected will not enumerate herein.MU for base station system may include one or more
BBU.It is directly connected between BBU by cable or optical fiber, forms various forms of network topology structures；It is also possible to multiple BBU
Exchange BB box by increasing setting interconnects, and forms various forms of network topology structures, such as: star-like, chain, ring-like etc.
Deng network construction form is versatile and flexible, is no longer described in detail one by one here.
First embodiment of the invention provides a kind of method of base station system and time synchronization, as shown in Fig. 2, the base station system
System includes: master unit MU 21, at least one remote radio unit (RRU) RRU 22 and in MU 21 and at least one described RRU
The optical fiber of information, the base station system are transmitted between 22 further include: clock sync server 23, for passing through the optical fiber and MU
Synchrodata is transmitted between 21 so that the MU 21, which carries out configuration processing according to the synchrodata, realizes clothes synchronous with clock
Be engaged in the time synchronization of device 23, the clock sync server 23, configure close at least one RRU 22 one end or
It is integrated at least one described RRU.
In the present embodiment, MU 21 is by transmitting synchrodata with clock sync server 23, so that 21 basis of MU
Synchrodata carries out the time synchronization of configuration processing realization and clock sync server 23.The side MU of base station system is without installation
GPS system is provided, low in cost, the selection of MU website is also more flexible and convenient.And RRU connects GPS function without supports,
Reduce RRU cost.Without configuration synchronous transfer route between MU and RRU, cost of arranging net is reduced.In addition, clock is synchronous
The range that server can choose is wide, such as the server for supporting 1588 agreement of IEEE can be used, and can also use some clock
Receiving module etc., equipment is simple, low in cost, and volume is also easy to install.
In the present embodiment, the MU 21 may include one or more BBU 211, as described above between BBU 211
Connection type can be various modes known to those skilled in the art, details are not described herein.The MU 21 is synchronous with clock to be taken
The transmission of synchrodata between business device 23 can be realized by individual optical fiber or transmission medium, also can use MU and RRU
Between optical fiber share to realize.
As an example, the clock sync server includes receiving module, can receive the synchronous ginseng of satellite system
Signal is examined, to realize the calibration of time, and then the time synchronization of base station system is realized, improves the precision of time synchronization.Institute
Stating satellite system includes GPS system, Beidou satellite system, Galileo system or Global Navigation Satellite System (Global
Navigation Satellite System, GLONASS) etc..
As an example, the clock sync server can be the server using IEEE1588 agreement, either
It using the server of other synchronous protocols, or is other clock sync servers.
As an example, the clock sync server can be the server using IEEE1588V2 release protocol.
The server of the IEEE 1588V2 release protocol includes defending receiving module to can receive the synchronous reference signal of satellite system.
The server of IEEE 1588V2 release protocol further includes IEEE 1588V2 protocol processes and telecommunication circuit, for from satellite system
Received synchronous reference signal of uniting synchronizes processing, and exports synchrodata by Ethernet interface.
In the scheme of the embodiment of the present invention, the clock sync server can be one, or multiple.Example
Such as, all BBU that can be in MU unit share a clock sync server, so that the equipment of system is simple, it is low in cost；
It can also be or a part of in equal configurable clock generator sync server near the different RRU websites or in difference RRU
Configurable clock generator sync server in RRU website or RRU, to realize the backup functionality of synchrodata.
As an example, the settable one or more change-over switches in described 21 one end MU or 21 inside MU.Described turn
Switch is changed for will be from the synchrodata of the clock sync server 23.The change-over switch can be interchanger, such as
LAN switch etc..For example, if MU 21 includes two either multiple BBU 11, when, it can be realized by change-over switch more
The transmission of synchrodata between a BBU and clock sync server.
Second embodiment of the invention provides a kind of base station system and method for synchronizing time, as shown in figure 3, the base station system
The distributed structure/architecture that can be main-remote design is also possible to the framework that radio frequency unit is designed in proximal end, is also possible to a part
Radio frequency unit is in proximal end, and a part of radio frequency unit is in the mixed type framework distally zoomed out.The present embodiment is only with main-remote framework
Example is illustrated.The base station system includes master unit MU 31, at least one remote radio unit (RRU) RRU 32 and in MU
The optical fiber of information is transmitted between 31 and at least one described RRU 32.About each remote unit RRU 32 and master unit MU 31
Network structure can be different configuration structures as described above, be also possible to other configurations structure known in the art.For
For the sake of clear, Fig. 3 illustrate only the connection relationship between a RRU 32 and MU 31.
The MU 31 may include that one or more Base Band Unit BBU 311 can be installed concentratedly in computer room.It is described
BBU 311 may include master control and clock synchronization unit, baseband signal processing unit, transmission unit, interface unit etc..About
The specific structure and function of BBU is the known of this field, is not described in detail herein.
The RRU 32 is installed outdoor close to antenna, and BBU is connected to transmit with multiple RRU by baseband radio interface
Signal.For example, the baseband radio interface can be general radio interface CPRI or other standards interface or customized connect
Mouthful etc..It is connected described in the present invention to be not restricted to be physically connected to, it can also refer to logically contiguous.
The base station system further includes clock sync server 33, configure close to installation RRU website one end or with
RRU is integrated, for example, can in RRU integrated clock sync server functional module.The clock sync server 33
For receiving synchronous reference signal from global position system GPS, and by transmitting synchrodata between optical fiber and MU 31.It is described
Clock sync server 33 may include: GPS receiver module and synchronous protocol processing and telecommunication circuit etc..The clock is same
Server 33 is walked by GPS receiver module from GPS receiver synchronous reference signal, synchronizes and handles and by Ethernet interface (FE
Mouthful) output synchrodata.
The base station system further includes the first smooth interconnecting module 34 and the second smooth interconnecting module 312.The first light switching
Module 34 and the second smooth 312 assignment configuration of interconnecting module are in one end close to RRU 32 and MU 31, or are arranged respectively at RRU
In 32 and MU 31, and it is connected by optical fiber.The first smooth interconnecting module 34, for export clock sync server 33
Synchrodata, the business datum that RRU 32 is exported carry out add drop multiplex processing.The first smooth interconnecting module is equipped with the first optical fiber
Interface (attached drawing is not shown), the first smooth interconnecting module 33 will come from clock synchronous service by the first shared optical fiber interface
The synchrodata of device 33 and the business datum from RRU 32 converge to same optical fiber, and are transmitted to the end MU by the optical fiber
Second smooth interconnecting module 312.The second light interconnecting module 312 isolates the synchrodata and business datum, and transmits
To MU 31.
The MU 31 receives the synchrodata and business datum, and is configured accordingly according to the synchrodata
Processing realizes MU and clock with the time synchronization of server 33 step by step.Those skilled in the art is it is found that MU gets same step number
According to and with those skilled in the art institute when after business datum, specifically how to configure the time synchronization of processing realization MU and RRU
Solution, such as delay process, timing-compensation etc. mode are no longer described in detail here.
Foregoing description only the direction from RRU to MU access description, it is also similar on opposite access.MU 31 is exported
Business datum and synchrodata, and synchrodata and business datum are converged to by same optical fiber by the second smooth interconnecting module 312
It is transmitted to the first smooth interconnecting module 34 at the end RRU, the first smooth interconnecting module is isolated synchrodata and business datum, transmitted respectively
To clock sync server 33 and RRU 32.The synchrodata that the MU 31 is exported can be based on clock sync server
The sync response data of synchrodata.
As an example, the described second smooth interconnecting module 312 isolate clock sync server 33 synchrodata and
After the business datum of RRU 32, it is transmitted separately to the sync cap and baseband radio interface of the BBU 311 of MU 31.The base band
Radio frequency interface can be general radio interface CPRI or other standards interface or self defined interface etc..The BBU 311
Configuration processing is carried out according to received clock synchronization data and exports sync response signal and business datum.BBU 311 is exported same
It walks response signal and business datum passes through the sync cap of BBU 311 respectively and baseband radio interface is transmitted to the second smooth switching model
Block, and it is transmitted through the fiber to the first smooth interconnecting module 34, and be transmitted to after the first smooth interconnecting module add drop multiplex processing
Clock sync server 33 and RRU 32.It is transmitted in fact between the BBU 311 and RRU 32 by the data of baseband radio interface
The time synchronization of existing BBU 31 and RRU 32.It is synchronized between at least one BBU 311 and clock sync server of MU 31
Protocol communication, so that the time synchronization between at least one described BBU 311 and clock sync server, so that BBU
Time synchronization between 311.
As an example, the clock sync server can be the server using IEEE1588 agreement, either
It using the server of other synchronous protocols, or is other clock sync servers.By using the service of synchronous protocol
Device, such as the server of IEEE1588V2 release protocol, allow MU to be easy to synchronize protocol communication with clock synchronizer,
Synchronous protocol is supported without transmission network, reduces network configuration requirement and cost.
As an example, the downstream transmission access between MU and RRU, can be real by shared same root optical fiber
It is existing, it can also be realized by different optical fiber.
As an example, the described first, second smooth interconnecting module 34,312 can be optical add/drop multiplexer (Optical
Add-Drop Multiplexer, OADM), it is also possible to other optical-electric modules.
As an example, the clock sync server includes GPS receiver module or GLONASS receiving module, can
To receive the synchronous reference signal of global position system or GLONASS, to realize the calibration of time, and then base station system is realized
The time synchronization of system.The global position system can be GPS system, Beidou satellite system or Galileo system etc..
As an example, the clock sync server 33 can be one, or multiple.For example, it may be
All BBU 311 in MU Unit 31 share a clock sync server, so that the equipment of system is simple, it is low in cost；?
It can be or a part of in equal configurable clock generator sync server near the different RRU websites or in difference RRU
Configurable clock generator sync server in RRU website or RRU, to realize the backup functionality of synchrodata.
Base station system also may be implemented without providing GPS signal in base station system provided in an embodiment of the present invention, MU computer room
Time synchronization requires to reduce, so that the setting of MU computer room is more flexible for the selection of MU website.RRU is without support chain
GPS function is connect, the cost of RRU is minimized.The embodiment of the present invention by be arranged light interconnecting module can make synchrodata and
Business datum shares same optical fiber, without individually configuring optical fiber transmission synchrodata, reduces cost of arranging net.In addition,
For by setting clock server and light interconnecting module make base station system realize time synchronization, it is original without changing
The interface of BBU and RRU configures, and the equipment that can make base station system is simple, low in cost.
The method of base station system and time synchronization that third embodiment of the invention provides, as shown in figure 4, the base station system
Including master unit MU 41, at least one remote radio unit (RRU) 42, clock sync server 43, and it is separately positioned on RRU and MU
The first smooth interconnecting module 44 and the second smooth interconnecting module 412 at end.Base station system provided in this embodiment and second embodiment institute
The base station system stated is similar.Something in common is referring to the description to second embodiment, and details are not described herein.Below mainly for not
It is described with place.
One or more change-over switches 413 are equipped with inside described 41 one end MU or MU 41.The change-over switch 413 and
Two smooth interconnecting modules 412 are connected.Second smooth interconnecting module isolates the synchrodata for receiving the clock sync server 43
After the business datum of the RRU 42, by the synchronous data transmission of the clock sync server 43 to the change-over switch
413, such as can be transmitted by Ethernet interface.The change-over switch synchrodata received is transferred and export to
BBU 211.The change-over switch can be interchanger, such as Lanswitch.It, can by the way that change-over switch is arranged at 41 end MU
So that the setting of MU is more flexible, especially when MU 41 includes two either multiple BBU 411, conversion can be passed through
Switch 413 realizes the transmission of the synchrodata between multiple BBU and clock sync server, is also conducive to expand base station system
Hold.For example, can also very easily make each BBU clothes synchronous with clock even if increasing multiple BBU to base station system dilatation
The transmission of synchrodata between business device, to realize the time synchronization between BBU.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, Ke Yitong
Computer program is crossed to instruct relevant hardware and complete, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Above-described specific embodiment has carried out further the purpose of the present invention, technical scheme and beneficial effects
It is described in detail, it should be understood that being not intended to limit the present invention the foregoing is merely a specific embodiment of the invention
Protection scope, those skilled in the art on the basis of not making the creative labor, any modification for being made, equivalent replacement,
Improve etc., it should all be included in the protection scope of the present invention.
Claims (5)
1. a kind of base station system, comprising: master unit and multiple radio frequency unit RRU lead between the master unit and the multiple RRU
Optical fiber connection is crossed, the base station system is distributed structure/architecture, and the master unit is mounted in computer room, and the multiple RRU is in outdoor
It is installed close to antenna, the base station system further include:
Multiple clock sync servers configure near the website of the different RRU, and the clock sync server includes
GPS receiver module and synchronous protocol processing and telecommunication circuit, for being joined by the GPS receiver module from GPS receiver is synchronous
Signal is examined, processing is synchronized and synchrodata is exported by Ethernet interface, the clock sync server is using IEEE
The server of 1588 V2 release protocol of 1588 agreements or IEEE, the multiple clock sync server is for realizing described same
The backup functionality of step data；
Wherein, the master unit includes multiple baseband control unit BBU, for passing through the optical fiber and the clock synchronous service
Device carries out the transmission of the synchrodata, so that the time synchronization of the multiple BBU and the clock sync server；
Wherein, the base station system further includes the first smooth interconnecting module and the second smooth interconnecting module, the first smooth interconnecting module
It is arranged respectively at the second smooth interconnecting module close to one end of the multiple RRU and the master unit, and passes through the optical fiber phase
Even；The first smooth interconnecting module, the synchrodata and RRU output for exporting the clock sync server
Business datum carry out add drop multiplex processing；The second smooth interconnecting module is for isolating the synchrodata and the business
Data, and it is transmitted to the master unit；
The master unit further includes change-over switch, and the change-over switch is connected with the described second smooth interconnecting module, and the conversion is opened
It closes for receiving the synchrodata from the described second smooth interconnecting module, and the synchrodata is exported to the multiple BBU,
To realize the time synchronization between multiple BBU；
Wherein, the BBU respectively includes baseband radio interface and sync cap, and the baseband radio interface is used for and the RRU
On baseband radio interface between transmit the business datum, the sync cap is used between the clock sync server
Transmit the synchrodata.
2. base station system as described in claim 1, which is characterized in that the first smooth interconnecting module includes that the first optical fiber connects
Mouthful, the synchrodata and the business datum share first optical fiber interface.
3. base station system as claimed in claim 2, which is characterized in that the second smooth interconnecting module includes that the second optical fiber connects
Mouthful, second optical fiber interface is connected with first optical fiber interface of the first smooth interconnecting module by the optical fiber.
4. base station system as described in claim 1, which is characterized in that the change-over switch is interchanger.
5. base station system as claimed in claim 4, which is characterized in that the first smooth interconnecting module and the second smooth interconnecting module
For optical add/drop multiplexer OADM.
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| CN201610035122.3A CN105515710B (en) | 2011-01-26 | 2011-01-26 | A kind of method and apparatus for realizing time synchronization |
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| CN201180001697.9A CN102725994B (en) | 2011-01-26 | 2011-01-26 | A kind of method and apparatus realizing time synchronized |
| CN201610035122.3A CN105515710B (en) | 2011-01-26 | 2011-01-26 | A kind of method and apparatus for realizing time synchronization |
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| CN107493600B (en) * | 2016-06-13 | 2021-07-23 | 中兴通讯股份有限公司 | Massive MIMO communication device and synchronization method |
| CN109417832A (en) * | 2016-11-30 | 2019-03-01 | 华为技术有限公司 | Uplink data transmission method, RHUB and BBU |
| CN109699068B (en) * | 2017-10-20 | 2021-05-28 | 阿里巴巴集团控股有限公司 | Base station synchronization method and device |
| CN112533282B (en) * | 2020-10-22 | 2021-08-06 | 中国电信股份有限公司 | Frequency synchronization method and system, near-end machine, far-end machine and storage medium |
| CN112543502B (en) * | 2020-11-30 | 2022-10-11 | 紫光展锐(重庆)科技有限公司 | Communication synchronization method, device, apparatus and storage medium |
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