CN106059698B - Method for synchronizing time and device based on the wireless time service of TD-LTE - Google Patents
Method for synchronizing time and device based on the wireless time service of TD-LTE Download PDFInfo
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- CN106059698B CN106059698B CN201610393511.3A CN201610393511A CN106059698B CN 106059698 B CN106059698 B CN 106059698B CN 201610393511 A CN201610393511 A CN 201610393511A CN 106059698 B CN106059698 B CN 106059698B
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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
- H04J3/0644—External master-clock
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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
- H04J3/0658—Clock or time synchronisation among packet nodes
Abstract
The present invention provides a kind of method for synchronizing time and device based on the wireless time service of TD-LTE, base station acquisition time synchronization signal；Base station is according to time synchronizing signal by eating dishes without rice or wine to send sync identification signal to time service terminal；Pulse position when time service terminal receives sync identification signal and records reception；Sync identification signal is aligned by time service terminal according to sync identification signal and pulse position with the time pulse that time service terminal generates；Time service terminal is the time service of distribution service terminal according to the sync identification signal and time pulse of alignment.The method for synchronizing time and device based on the wireless time service of TD-LTE, the Time Synchronization Mechanism of TD-LTE network itself is utilized in base station, according to the time synchronizing signal of acquisition by eating dishes without rice or wine to send sync identification signal, the transmission line of sync identification signal can be used for transmission to avoid laying, its structure is simple, and the own resource of TD-LTE network is taken full advantage of, it avoids and results in waste of resources because of resource redundancy.
Description
Technical field
The present invention relates to Time synchronization technique field more particularly to a kind of time synchronization sides based on the wireless time service of TD-LTE
Method and device.
Background technique
Time synchronization is of great significance for the accident analysis, monitoring control and operational management of electric system.Especially
When after the accident, grasping real time information in time, proper treatment could be carried out to it, accident impact is controlled in a certain range
It is interior, it is ensured that system is safe and stable, economical operation, and more stringent requirements are proposed for this Time synchronization technique to system.Currently, electric
The higher time synchronization time service mode of precision is the PTP networking time service mode based on E1 in net.
PTP is a kind of Precision Time Protocol of IEEE 1588 (Digital reference service accurate clock synchronization protocol) specification, is used
The clock of terminal device carries out submicrosecond grade in standard ethernet or other distributed bus systems for using multicasting technology
It is synchronous.PTP networking time service mode based on E1 requires each network node that must have the network interface card of real-time clock on hardware, can be with
Realize the related service based on PTP protocol stack.Although PTP time synchronization precision is higher, current PTP protocol version is not propped up still
It holds and transmits on the router, the transmission of synchronization signal relies primarily on point-to-point fixed link transmission mode.Therefore, with when
Between synchronisation requirement increase, the transmission line of required laying is more complicated.
Summary of the invention
Based on this, it is necessary to provide a kind of time synchronization side based on the wireless time service of TD-LTE without being laid with transmission line
Method and device.
A kind of method for synchronizing time based on the wireless time service of TD-LTE, comprising:
Base station acquisition time synchronization signal；
The base station is according to the time synchronizing signal by eating dishes without rice or wine to send sync identification signal to time service terminal；
Pulse position when the time service terminal receives the sync identification signal and records reception；
The time service terminal is according to the sync identification signal and the pulse position by the sync identification signal and institute
State the time pulse alignment of time service terminal generation；
The time service terminal is the time service of distribution service terminal according to the sync identification signal and time pulse of alignment.
A kind of time synchronism apparatus based on the wireless time service of TD-LTE, comprising:
Synchronous signal obtaining module, is set on base station, is used for the base station acquisition time synchronization signal；
Synchronizing information sending module, is set on base station, passes through sky according to the time synchronizing signal for the base station
Mouth sends sync identification signal to time service terminal；
Synchronizing information receiving module is set in the time service terminal, is received described synchronize for the time service terminal and is awarded
When signal and pulse position when recording reception；
Synchronizing information recovery module is set in the time service terminal, is awarded for the time service terminal according to described synchronize
When signal and the pulse position sync identification signal is aligned with the time pulse that the time service terminal generates；
Service terminal time service module is set in the time service terminal, for the time service terminal according to the synchronization of alignment
Time signal and time pulse are the time service of distribution service terminal.
Above-mentioned method for synchronizing time and device based on the wireless time service of TD-LTE, TD-LTE network itself is utilized in base station
Time Synchronization Mechanism can be used for according to the time synchronizing signal of acquisition by eating dishes without rice or wine to send sync identification signal to avoid laying
The transmission line of sync identification signal is transmitted, structure is simple, and takes full advantage of the own resource of TD-LTE network, avoids
It results in waste of resources because of resource redundancy.
Detailed description of the invention
Fig. 1 is the flow chart of the method for synchronizing time based on the wireless time service of TD-LTE of an embodiment；
Fig. 2 is the specific flow chart of a step of the method for synchronizing time based on the wireless time service of TD-LTE of Fig. 1；
Fig. 3 is the specific flow chart of another step of the method for synchronizing time based on the wireless time service of TD-LTE of Fig. 1；
Fig. 4 is the application scenario diagram of the method for synchronizing time based on the wireless time service of TD-LTE of an embodiment；
Fig. 5 is the signal waveforms during the time service terminal of an embodiment restores sync identification signal from base station；
Fig. 6 is the function structure chart of the time synchronism apparatus based on the wireless time service of TD-LTE of an embodiment；
Fig. 7 is the cellular construction figure of a module of Fig. 6；
Fig. 8 is the cellular construction figure of another module of Fig. 6.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give preferred embodiment of the invention.But the invention can be realized in many different forms, however it is not limited to herein
Described embodiment.On the contrary, purpose of providing these embodiments is keeps the understanding to the disclosure more saturating
It is thorough comprehensive.
Unless otherwise defined, all technical and scientific terms used herein and belong to technical field of the invention
The normally understood meaning of technical staff is identical.Term as used herein in the specification of the present invention is intended merely to description tool
The purpose of the embodiment of body, it is not intended that in the limitation present invention.Term as used herein " or/and " it include one or more phases
Any and all combinations of the listed item of pass.
As shown in Figure 1, being the method for synchronizing time based on the wireless time service of TD-LTE of one embodiment of the invention, comprising:
S110: base station acquisition time synchronization signal.
Base station is TD-LTE (Time Division Long Term Evolution, timesharing long term evolution) communication network
In base station, i.e., in certain area of radio coverage, by being carried out between mobile switching center, with mobile telephone terminal
Radio station is believed in the transceiving of information transmitting.Time synchronizing signal can be obtained for satellite or PTP Network Synchronization for the time
Synchronous signal.Time synchronizing signal precision is high, and the time such as obtained by HA Global Positioning Satellite/big-dipper satellite (GPS/BD) is same
The synchronization accuracy for walking signal is less than 200ns, and the synchronization accuracy of the time synchronizing signal obtained by PTP network is less than 1.5us.
Specifically, time synchronizing signal includes pulse per second (PPS) and absolute time.
S130: the base station is according to the time synchronizing signal by eating dishes without rice or wine to send sync identification signal to time service terminal.
Base station is using the Time Synchronization Mechanism of TD-LTE network itself according to the time synchronizing signal of acquisition by eating dishes without rice or wine to send out
Send sync identification signal.Wherein, it eats dishes without rice or wine be air interface.Specifically, air interface can be Um Interface or Uu interface.
Um Interface be MS (Mobile Station, mobile station) and BTS (Base Transceiver Station, base transceiver station) it
Between interface, by interface MS complete with the communication of network side, complete packet data transmission, mobile management, session management,
Various functions such as wireless resource management.Uu interface is that UE (User Equipment/ user equipment) is linked into WCDMA
The fixed network interface section of (Wideband Code Division Multiple Access, wideband code division multiple access) system.
Specifically, base station is according to the time synchronizing signal of acquisition, to time synchronizing signal carry out parsing obtain pulse per second (PPS) and
Absolute time；Then the sync identification signal that corresponding format of eating dishes without rice or wine is generated according to pulse per second (PPS) and absolute time, finally by the synchronization
Time signal is by eating dishes without rice or wine to send.
S150: the pulse position when time service terminal receives the sync identification signal and records reception.
Time service terminal is the terminal device in the communication system of power grids, for being each distribution service terminal time service in power grid.Time service is whole
End receives the sync identification signal that base station is sent, but the sync identification signal that receives of time service terminal and base station send synchronize award
When signal certainly exist certain time delay, it is therefore desirable to record receive when pulse position, with time service terminal restore base station send out
The sync identification signal sent.
S170: the time service terminal is according to the sync identification signal and the pulse position by the sync identification signal
The time pulse generated with the time service terminal is aligned.
The sync identification signal that the sync identification signal received due to time service terminal and base station are sent certainly exists centainly
Time delay, therefore, time service terminal needs based on the received that sync identification signal and the pulse position are restored the base station and sent
Sync identification signal, i.e., the sync identification signal is awarded with described according to the sync identification signal and the pulse position
When the time pulse alignment that generates of terminal, the sync identification signal for sending received sync identification signal and base station is in pulse position
It sets and is consistent.
S190: the time service terminal is the time service of distribution service terminal according to the sync identification signal and time pulse of alignment.
After sync identification signal is restored good by time service terminal, i.e., sync identification signal and the time service terminal generate when
Between pulse alignment after, can according to the sync identification signal of recovery be the time service of distribution service terminal, in this way, making distribution business
The time signal of terminal with time synchronizing signal is almost the same achievees the purpose that time synchronization.
The above-mentioned method for synchronizing time based on the wireless time service of TD-LTE, the time that TD-LTE network itself is utilized in base station are same
Step mechanism can be used for transmission together according to the time synchronizing signal of acquisition by eating dishes without rice or wine to send sync identification signal to avoid laying
The transmission line of time signal is walked, structure is simple, and takes full advantage of the own resource of TD-LTE network, avoids because of resource
Redundancy and result in waste of resources.
The base station sends sync identification letter by eating dishes without rice or wine according to the time synchronizing signal in one of the embodiments,
The step of number to time service terminal, i.e. step S130, comprising:
S231: pulse per second (PPS) and absolute time are obtained according to the clock sync signal.
In the present embodiment, time synchronizing signal includes pulse per second (PPS) and absolute time.
Pulse per second (PPS) is the middle pulse signal for generating a pulse per second.Absolute time be the Coordinated Universal Time(UTC) (UTC,
Coordinated Universal Time), also known as world's unified time, universal time or international coordination time.
S233: the sync identification signal of radio frames form is generated according to the pulse per second (PPS) and the absolute time.The nothing
Line frame includes pulse per second (PPS) marker, and the pulse per second (PPS) marker is the presetting digit capacity in the basic configuration information of the radio frames
Predeterminated position in reserved bit position.
Since Physical Broadcast Channel (PBCH, Physical Broadcast Channel) has the basic configuration of 24 bits to believe
It ceases (MIB, Master Information Block).It include 10 idle bits in basic configuration information position is reserved bit
Position.Therefore, if can use reserved bit be in predeterminated position on 1 bit or kilo byte as pulse per second (PPS) marker, note
For PpsF.In this way, the PpsF of four radio frames after pulse per second (PPS) rising edge is set as the first default identification information, such as " 1 ",
The PpsF of its radio frames is set as the second default identification information, such as " 0 ", is identified to the rising edge of pulse per second (PPS), awards in this way
When terminal first radio frame boundaries can be identified by PpsF flag bit, this boundary is exactly the rising edge of pulse per second (PPS).
It is to be appreciated that in other embodiments, can also be arranged in the PpsF of the radio frames after the failing edge of pulse per second (PPS)
For the first default identification information, the PpsF of other radio frames is set as the second default identification information.Wherein, the first default mark
Information and the second default identification information mutual exclusion.
Preferably, predeterminated position is preferably the middle position in reserved bit position, dry to avoid the information in other positions
It disturbs.
S235: pass through the sync identification signal for eating dishes without rice or wine to send the radio frames form according to the pulse per second (PPS).It is described
Radio frames and the pulse per second (PPS) phase alignment and cycle synchronisation.
Radio frames and pulse per second (PPS) phase alignment and cycle synchronisation, in this way, facilitating time service terminal can be to the second arteries and veins received
The sync identification signal for rushing form is restored, that is, the time pulse pair for facilitating sync identification signal and the time service terminal to generate
Together.
Preferably, described to pass through the sync identification signal for eating dishes without rice or wine to send the radio frames form according to the pulse per second (PPS)
Mode be,
When the pulse per second (PPS) is rising edge, by eating dishes without rice or wine to send the nothing with the pulse per second (PPS) phase alignment and cycle synchronisation
The sync identification signal of line frame form.
It should be understood that in other embodiments, being also possible to pass through transmission and the institute of eating dishes without rice or wine when pulse per second (PPS) is failing edge
State the sync identification signal of the radio frames form of pulse per second (PPS) phase alignment and cycle synchronisation.
The time service terminal is according to the sync identification signal and the pulse position by institute in one of the embodiments,
The step of stating sync identification signal and be aligned with the time pulse that the time service terminal generates, it is specifically as follows, time service terminal is raw
At the rising edge of time pulse be identified as with continuous four pulse per second (PPS)s for receiving first in the first default identification information
Pulse per second (PPS) marker is the frame boundaries of the radio frames of the first default identification information (such as can be " 1 ") and the rising edge of time pulse
Alignment, to restore sync identification signal.
The time service terminal is according to the sync identification signal and the pulse position by institute in one of the embodiments,
State the step of sync identification signal is aligned with time pulse, i.e. step S170, comprising:
S371: the time service terminal obtains the advance parameters that the base station is sent.
Advance parameters include Timing Advance (TA, Timing Advance).The effect of Timing Advance is for mending
Repay information transmission delay.
It is to be appreciated that before step S371, further includes: the base station sends advance parameters.
S373: the time delay that the time service terminal is transmitted according to the advance parameters compensated information, and according to the synchronization
The sync identification signal is aligned by time signal and the pulse position with time pulse.
Time service terminal compensates the time delay of compensated information transmission according to advance parameters, meanwhile, sync identification based on the received
Signal and the pulse position restore the sync identification signal that the base station is sent, i.e., by the sync identification signal and time arteries and veins
Punching alignment.Finally, so that the sync identification signal that the sync identification signal restored is sent closer to base station.
Pulse when the time service terminal receives the sync identification signal and records reception in one of the embodiments,
The step of position, i.e. step S150, comprising: the time service terminal generates time pulse；The time service terminal receives the synchronization
Time signal simultaneously records pulse position when receiving according to the time pulse.
Time service terminal generates time pulse using the clock mechanisms of itself, and records arteries and veins when receiving sync identification signal
Rush position.In this way, time service terminal can be according to the sync identification signal and pulse position received to the sync identification received
Signal and time pulse are adjusted, and to restore pulse per second (PPS), and restore sync identification signal according to the pulse per second (PPS) of recovery, final extensive
The sync identification signal that complex radical station is sent.
Application scenarios of the invention are the TD-LTE net in the communication system of power grids solution using TD-LTE network as bearer network
Network mainly accesses overall grid control system by the communication system of power grids, realizes the intelligentized management function to each distribution service terminal,
The especially management of time synchronization.It is defended as shown in figure 4, the base station (eNB1 or eNB2) of TD-LTE network obtains global location
The time synchronizing signal that star/big-dipper satellite GPS/BD is sent, and according to the time synchronizing signal of acquisition by eating dishes without rice or wine to send synchronization
Time signal；Time service terminal receives sync identification signal, and restores the sync identification signal that the base station is sent；It is same by the time
Step output unit is the time service of distribution service terminal.In a wherein specific embodiment, time service terminal is restored to synchronize to award from base station
When signal during signal waveforms it is as shown in Figure 5.
As shown in fig. 6, the present invention also provides a kind of void corresponding with method for synchronizing time based on the wireless time service of TD-LTE
Quasi- device.A kind of time synchronism apparatus based on the wireless time service of TD-LTE, comprising:
Synchronous signal obtaining module 610, is set on base station, is used for base station acquisition time synchronization signal；
Synchronizing information sending module 630, is set on base station, is passed through for the base station according to the time synchronizing signal
Eat dishes without rice or wine to send sync identification signal to time service terminal；
Synchronizing information receiving module 650 is set in the time service terminal, receives the synchronization for the time service terminal
Time signal and pulse position when recording reception；
Synchronizing information recovery module 670 is set in the time service terminal, for the time service terminal according to the synchronization
The sync identification signal is aligned by time signal and the pulse position with the time pulse that the time service terminal generates；
Service terminal time service module 690 is set in the time service terminal, for the time service terminal according to the same of alignment
It walks time signal and time pulse is the time service of distribution service terminal.
The above-mentioned time synchronism apparatus based on the wireless time service of TD-LTE, the time that TD-LTE network itself is utilized in base station are same
Step mechanism can be used for transmission together according to the time synchronizing signal of acquisition by eating dishes without rice or wine to send sync identification signal to avoid laying
The transmission line of time signal is walked, structure is simple, and takes full advantage of the own resource of TD-LTE network, avoids because of resource
Redundancy and result in waste of resources.
Please refer to Fig. 7 synchronizing information sending module 630 in one of the embodiments, comprising:
Information acquisition unit 731, for obtaining pulse per second (PPS) and absolute time according to the clock sync signal；
Information generating unit 733, for generating the synchronization of radio frames form according to the pulse per second (PPS) and the absolute time
Time signal；The radio frames include pulse per second (PPS) marker, and the pulse per second (PPS) marker is that the basic configuration of the radio frames is believed
Predeterminated position in the reserved bit position of presetting digit capacity in breath；
Information transmitting unit 735 eats dishes without rice or wine to send the described same of the radio frames form for passing through according to the pulse per second (PPS)
Walk time signal；The radio frames and the pulse per second (PPS) phase alignment and cycle synchronisation.
The information transmitting unit 635 in one of the embodiments, is also used to when the pulse per second (PPS) is rising edge,
By the sync identification signal for eating dishes without rice or wine to send the radio frames form with the pulse per second (PPS) phase alignment and cycle synchronisation.
Referring to Fig. 8, the synchronizing information recovery module 670 in one of the embodiments, comprising:
Lead acquiring unit 871 obtains the advance parameters that the base station is sent for the time service terminal；
Information recovery unit 873, for the time delay that the time service terminal is transmitted according to the advance parameters compensated information,
And the sync identification signal is aligned with time pulse according to the sync identification signal and the pulse position.
The synchronizing information receiving module 650 includes: pulse generation unit in one of the embodiments, for described
Time service terminal generates time pulse；Position recording unit receives the sync identification signal and basis for the time service terminal
Pulse position when the time pulse record receives.
Only several embodiments of the present invention are expressed for above embodiments, and the description thereof is more specific and detailed, but can not
Therefore limitations on the scope of the patent of the present invention are interpreted as.It should be pointed out that for those of ordinary skill in the art,
Without departing from the inventive concept of the premise, multiple modification and improvement can also be made, these belong to protection model of the invention
It encloses.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (8)
1. a kind of method for synchronizing time based on the wireless time service of TD-LTE characterized by comprising
Base station acquisition time synchronization signal；
The base station is according to the time synchronizing signal by eating dishes without rice or wine to send sync identification signal to time service terminal；
Pulse position when the time service terminal receives the sync identification signal and records reception；
The time service terminal awards the sync identification signal with described according to the sync identification signal and the pulse position
When terminal generate time pulse alignment；
The time service terminal is the time service of distribution service terminal according to the sync identification signal and time pulse of alignment；
The base station is according to the time synchronizing signal by wrapping the step of eating dishes without rice or wine to send sync identification signal to time service terminal
It includes:
Pulse per second (PPS) and absolute time are obtained according to the time synchronizing signal；
The sync identification signal of radio frames form is generated according to the pulse per second (PPS) and the absolute time；The radio frames include the second
Pulse marker, the pulse per second (PPS) marker are the reserved bit position of the presetting digit capacity in the basic configuration information of the radio frames
In predeterminated position；
Pass through the sync identification signal for eating dishes without rice or wine to send the radio frames form according to the pulse per second (PPS)；The radio frames and institute
State pulse per second (PPS) phase alignment and cycle synchronisation.
2. the method for synchronizing time according to claim 1 based on the wireless time service of TD-LTE, which is characterized in that the basis
The pulse per second (PPS) includes: by way of the sync identification signal for the radio frames form of eating dishes without rice or wine to send
When the pulse per second (PPS) is rising edge, by eating dishes without rice or wine to send the radio frames with the pulse per second (PPS) phase alignment and cycle synchronisation
The sync identification signal of form.
3. the method for synchronizing time according to claim 1 based on the wireless time service of TD-LTE, which is characterized in that the time service
The step of sync identification signal is aligned by terminal according to the sync identification signal and the pulse position with time pulse,
Include:
The time service terminal obtains the advance parameters that the base station is sent；
The time delay that the time service terminal is transmitted according to the advance parameters compensated information, and according to the sync identification signal and
The sync identification signal is aligned by the pulse position with time pulse.
4. the method for synchronizing time according to claim 1 based on the wireless time service of TD-LTE, which is characterized in that the time service
The step of pulse position when terminal receives the sync identification signal and records reception includes:
The time service terminal generates time pulse；
The time service terminal receives the sync identification signal and records pulse position when receiving according to the time pulse.
5. a kind of time synchronism apparatus based on the wireless time service of TD-LTE characterized by comprising
Synchronous signal obtaining module, is set on base station, is used for the base station acquisition time synchronization signal；
Synchronizing information sending module, is set on base station, for the base station according to the time synchronizing signal by eating dishes without rice or wine to send out
Send sync identification signal to time service terminal；
Synchronizing information receiving module is set in the time service terminal, receives the sync identification letter for the time service terminal
Number and pulse position when recording reception；
Synchronizing information recovery module is set in the time service terminal, is believed for the time service terminal according to the sync identification
Number and the pulse position sync identification signal is aligned with the time pulse that the time service terminal generates；
Service terminal time service module is set in the time service terminal, for the time service terminal according to the sync identification of alignment
Signal and time pulse are the time service of distribution service terminal；
The synchronizing information sending module, comprising:
Information acquisition unit, for obtaining pulse per second (PPS) and absolute time according to the time synchronizing signal；
Information generating unit, the sync identification for generating radio frames form according to the pulse per second (PPS) and the absolute time are believed
Number；The radio frames include pulse per second (PPS) marker, and the pulse per second (PPS) marker is in the basic configuration information of the radio frames
Predeterminated position in the reserved bit position of presetting digit capacity；
Information transmitting unit, for being believed according to the pulse per second (PPS) by eating dishes without rice or wine to send the sync identification of the radio frames form
Number；The radio frames and the pulse per second (PPS) phase alignment and cycle synchronisation.
6. the time synchronism apparatus according to claim 5 based on the wireless time service of TD-LTE, which is characterized in that the information
Transmission unit is also used to send and the pulse per second (PPS) phase alignment and period when the pulse per second (PPS) is rising edge by eating dishes without rice or wine
The sync identification signal of synchronous radio frames form.
7. the time synchronism apparatus according to claim 5 based on the wireless time service of TD-LTE, which is characterized in that the synchronization
Information recovery module, comprising:
Lead acquiring unit obtains the advance parameters that the base station is sent for the time service terminal；
Information recovery unit, for the time delay that the time service terminal is transmitted according to the advance parameters compensated information, and according to
The sync identification signal is aligned by the sync identification signal and the pulse position with time pulse.
8. the time synchronism apparatus according to claim 5 based on the wireless time service of TD-LTE, which is characterized in that the synchronization
Information receiving module includes:
Pulse generation unit generates time pulse for the time service terminal；
Position recording unit receives the sync identification signal for the time service terminal and is connect according to time pulse record
The pulse position in time receiving.
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| CN112235860A (en) * | 2019-07-15 | 2021-01-15 | 中兴通讯股份有限公司 | Active antenna unit time delay alignment method and device and active antenna unit |
| CN114667771A (en) * | 2020-01-20 | 2022-06-24 | Oppo广东移动通信有限公司 | Time delay compensation method, device and equipment |
| CN111294132B (en) * | 2020-02-04 | 2021-04-06 | 北京邮电大学 | Absolute time synchronization method and device and electronic equipment |
| CN113015236B (en) * | 2021-02-03 | 2023-05-05 | 北京方天鸿瑞科技有限公司 | Bottom-up clock synchronization method and device |
| CN113271121B (en) * | 2021-04-06 | 2022-08-05 | 北京大学 | Cable transmission method |
| CN115835121A (en) * | 2021-09-17 | 2023-03-21 | 中兴通讯股份有限公司 | Air interface time service method, terminal and system |
| CN114583837B (en) * | 2022-04-20 | 2023-11-14 | 国网北京市电力公司 | Distributed high-frequency synchronous sampling data transmission method, device and medium for power distribution network |
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| CN101420269A (en) * | 2008-12-02 | 2009-04-29 | 华为技术有限公司 | Method, device and system for time synchronization |
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| CN101888695B (en) * | 2009-05-12 | 2013-10-30 | 大唐移动通信设备有限公司 | Time service method, system and device of base station |
| CN101902292B (en) * | 2009-12-30 | 2013-07-10 | 大唐电信（成都）信息技术有限公司 | UTC high-precision time synchronization method based on optical transmission network |
| CN105188128B (en) * | 2015-08-21 | 2018-10-16 | 北京北方烽火科技有限公司 | A kind of wireless time service and air interface synchronization method, base station, communication apparatus and system |
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