CN104955146B - A kind of method for synchronizing time of LTE DMO terminals - Google Patents
A kind of method for synchronizing time of LTE DMO terminals Download PDFInfo
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- CN104955146B CN104955146B CN201410125509.9A CN201410125509A CN104955146B CN 104955146 B CN104955146 B CN 104955146B CN 201410125509 A CN201410125509 A CN 201410125509A CN 104955146 B CN104955146 B CN 104955146B
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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- Synchronisation In Digital Transmission Systems (AREA)
Abstract
This application discloses a kind of method for synchronizing time of LTE network-off direct-passings DMO terminals, including：A, DMO terminals receive neighbouring DMO main control terminals, the relevant information of cluster head；B, DMO main control terminals receive the control information of neighbouring DMO main control terminals broadcast and identify cluster head, and the control information includes cluster head mark, the clock accuracy class letter of DMO terminals, higher level's calibration clock mark, period regulation timer, clock effective marker position and transmitted power rating；C, DMO main control terminals complete down-going synchronous according to the control information；D, cluster head estimates the TA values of all DMO main control terminals in overlay area, and coordinates emission time alignment between the DMO main control terminals；DMO main control terminal broadcast control messages, the DMO main control terminals emitted are synchronous with cluster head periodicmaintenance emission time.
Description
Technical field
This application involves wireless communication technology field more particularly to a kind of method for synchronizing time of LTE DMO terminals.
Background technology
Digital Clustering mobile communication system is the advanced professional nothing of a new generation that early 1990s, mid-term grow up
Line electricity command dispatching system.Digital clustering communication system is dedicated command dispatching system, and system channel uses dynamic allocation side
Formula, working method are mostly either simplex and semiduplex mode, and it is wirelessly to wireless that the network coverage, which uses great Qu MPS process, service set,
Short time call, service-user have priority and specific function, be suitable for group user and special user group, belong to special
Network communication system.Digital cluster communication grows up on the basis of simulating cluster communication, digital cluster communication signaling,
Each key techniques such as multi-access mode, speech coding, modulation /demodulation and channel control use digitized processing comprehensively, simultaneously
The characteristics of based on digital display circuit, combines simultaneous techniques, error-detection error-correction technology and diversity technique etc., and digital cluster communication is made to have
It is anti-to bother that ability is strong, high quality is transmitted at a distance, the business adaptability and peripheral hardware of high level security, high reliability and high flexible
The properties such as the concatenation ability of interface, and the capacity bigger of entire digital clustering communication system, systems connection are more convenient.
With the development of mobile communication technology, people seek common ground while reserving difference as possible, and the professional mobile communication system of exploitation is enable to use up
May meet the needs of multiple and different specialized departments, pan-European trunked radio (TETRA, Trans European Trunked
Radio) digital clustering communication system is exactly to grow up in this background.TETRA digital clustering communication systems can be same
Command scheduling, data transmission and telephone service are provided on one technology platform, not only provide the scheduling feature of multigroup group, but also can
To provide short data information service, packet data service and digitized full duplex mobile phone service.TETRA Digital Clusterings
System supports network-off direct-passing (DMO, Direct Mode Operation) mode, DMO be make mobile station in no network coverage or
The technology of the direct communication of short distance is realized in the case of network service outages.Under DMO patterns, no network equipment participates in
End to end in cluster communication, clock, which synchronizes, to be solved by DMO terminals (terminal for having DMO functions) oneself.
In TETRA systems, DMO terminals are synchronous with synchronized algorithm completion clock using High Precision Crystal Oscillator is embedded.TETRA is marked
Requirement of the standard to crystal oscillator：Precision is higher than ± 2ppm, 25~100Hz of adjusting step.TETRA DMO terminals (have in TETRA systems
The terminal of DMO functions) by a narrowband frequency point can half-duplex send voice, so the filter of 25KHz wide
Force down out-of-band interference.Different TETRA DMO callings use different 25KHz channels.The DMO interchannels that time irreversibility is brought are dry
The narrow band filter of machine can be received by, which disturbing, forces down.Relatively simplify so clock synchronizes.
If to realize DMO communications in the wideband digital trunked mobile communication system based on LTE, what it is in 20HMz is
System bandwidth content receives multichannel DMO calling.Per road DMO, calling occupies some Physical Resource Block (PRB).Multichannel DMO is called in broadband
Between if asynchronous, just have interference.LTE DMO systems (LTE system for having DMO functions) cannot be used as TETRA
The filtering of DMO narrow band filters interferes with rational noise background to what other DMO in broadband were called.LTE DMO systems need new
Timing synchronisation mechanism reduce it is asynchronous caused by with interior interference.
DMO communication mechanisms based on TD-LTE technologies propose high requirement to the net synchronization capability of terminal.LTE DMO systems
Timing synchronisation problem be made of following 3 part：
The reference clock of DMO terminals synchronizes：It is all when GPS (GPS) signal can be utilized
DMO terminals can be synchronous with GPS signal；When GPS signal is not available, the frequency drift for considering terminal crystal oscillator clock is needed
The influence of timing slip caused by moving.When lacking high-precision external reference clock, the crystal oscillator frequency stability of DMO terminals is for same
The obvious effect for walking performance, needs to DMO terminal crystal oscillator periodic calibrations.
The sign synchronization of DMO main control terminals and slave terminal：The only symbol of slave terminal alignment main control terminal and wireless
Frame could be demodulated correctly.The synchronizing signal (primary synchronization signal PSS/ secondary synchronization signal SSS) that slave terminal receives main control terminal is real
Existing frame synchronization and sign synchronization.
The emission time of multiple DMO main control terminals is aligned：In nearby sphere, multiple DMO master controls of no center control are whole
If without reliable sign synchronization mechanism, cause between each main control terminal in the bandwidth carrier of 20MHz simultaneously when emitting at end
Clock cannot synchronize, the interior interference of band between different DMO will be caused to call.The wireless signal that DMO terminal dynamic positions introduce
Propagation delay needs alignment mechanism.
The timing synchronisation mechanism of LTE system can not be entirely used for LTE DMO systems.Terminal inside same DMO callings,
Calling terminal can be estimated to adjust the uplink timing advance (TA) of slave terminal, similar to the TA adjustment processes of LTE.Still have
New difficulty is as follows：
GPS or base station signal can be as the time references of LTE DMO terminals.But indoors, tunnel, the inferior nothing in ground
The scene of GPS/ base station signals still needs the synchronous method based on crystal oscillator.
The emission time of multiple DMO main control terminals is aligned：It is to be mutually aligned between the Base Transmitter moment in LTE system
's.Adjustment is also required between DMO main control terminal emission times to be mutually aligned.Even if long symbol cyclic extensions can reduce two
The TA of DMO master controls UE is shifted out the chance of FFT sample length windows.
Invention content
This application provides a kind of method for synchronizing time of LTE DMO terminals, can be in no base station Scene realization DMO terminals
Time synchronization.
A kind of method for synchronizing time of LTE DMO terminals provided by the embodiments of the present application, including：
A, DMO terminals receive neighbouring DMO main control terminals, the relevant information of cluster head；
B, DMO main control terminals receive the control information of neighbouring DMO main control terminals broadcast, and the control information includes cluster head mark
Knowledge, the clock accuracy class letter of DMO terminals, higher level calibrate clock mark, period regulation timer, clock effective marker position and
Transmitted power rating；
C, DMO main control terminals complete down-going synchronous according to the control information；
D, cluster head estimates the TA values of all DMO main control terminals in overlay area, and coordinates to send out between the DMO main control terminals
It penetrates and is aligned constantly；DMO main control terminal broadcast control messages, the DMO main control terminals emitted emit with cluster head periodicmaintenance
Timing synchronization.
Preferably, further comprising before step A：
Judge whether DMO main control terminals can receive GPS signal, if so, DMO main control terminals are according to period regulation timer
Periodic synchronous continues to execute step A in GPS signal, otherwise directly executes step A.
Preferably, further comprising before step A：
AA1, judge that DMO main control terminals whether in the LTE trunked base station areas of coverage, if executing step AA2, are otherwise held
Row step A；
AA2, DMO terminal are synchronized with base station downlink signal, and the clock frequency and radio frames for adjusting DMO terminals receive timing；
Base station obtains the uplink timing advance TA values of DMO main control terminal emission times, the transmitting of DMO master terminals by random access procedure
Business datum, base station utilize the reference signal of DMO main control terminals, periodically adjust the TA of DMO main control terminals；And terminate this stream
Journey.
Preferably, further comprising before step B：
DMO cluster heads are judged whether there is, if executing step B, otherwise, election of cluster head is carried out and selects one from DMO terminals
Then cluster head or DMO main control terminals execute step B using itself as cluster head.
Preferably, DMO terminals are one or a combination set of following by the necessary condition of election cluster head：Emit the strong DMO of signal
The DMO terminals of terminal, the DMO terminals of clock standard, or transmitting signal morning/maintenance channel morning.
Preferably, the TA values of all DMO main control terminals detect DMO master controls by cluster head in cluster head estimation overlay area
The primary synchronization signal PSS/ secondary synchronization signals SSS or reference signal of terminal are realized.
Preferably, the DMO main control terminals emitted are synchronous with cluster head periodicmaintenance emission time according to the period
The setting periodic triggers of calibrated timer, or triggered when reaching the offset thresholding upper limit of TA adjustment.
Preferably, the period regulation timer when it is 5 seconds to 10 seconds a length of.As can be seen from the above technical solutions, sharp
With GPS signal, the reference clock sources such as base station signal or High Precision Crystal Oscillator carry out DMO terminals the mechanism of periodic calibration, carry
The information and period regulation timer of the clock accuracy class letter and higher level's calibration clock of terminal are gone out, itself clock has
The method of valid flag position.Using the method, DMO terminals can be applied to the scene of no GPS/ base station signals, present techniques side
Case is suitable for different terminal crystal oscillator precision, ensures calibration accuracy, saves power consumption of terminal.It proposes and utilizes eNB or cluster head week
Phase property coordinates the emission time alignment mechanism of multiple DMO main control terminals, effectively reduces in DMO systems and is done caused by synchronous error
It disturbs.Application scheme is suitable for using among the DMO systems of LTE modulation systems or end-to-end (D2D) system.
Description of the drawings
Fig. 1 is the emission time alignment mechanism schematic diagram of multiple DMO main control terminals in the embodiment of the present application；
Fig. 2 is that DMO terminals provided by the embodiments of the present application synchronize flow diagram；
Specific implementation mode
A kind of method for synchronizing time of LTE DMO terminals provided by the present application, basic fundamental thought are：
Clock accuracy level value mark is introduced in DMO terminal broadcast information and higher level calibrates clock mark (such as GPS
What school was crossed, eNB is crossed in school, the grade of autonomous oscillating crystal).GPS clock precision highest, eNB take second place, and crystal oscillator is accurate according to device
Degree determines.In this way, the clock source system of DMO systems can be established, the selection of DMO terminals is same with high-precision clock source signals
Step；
DMO terminals according to weighting algorithm (according to the source of the clock of oneself and centre frequency, and receive it is multiple
The timing of the DMO main control terminals of maintenance channel, centre frequency source are weighted by being multiplied by corresponding weights) it calculates oneself and works as
Before the clock that should use and centre frequency and corresponding confidence level；It is sent according to calculated clock and centre frequency
DM_PSS/DM_SSS/DM_PBCH signals, and broadcast the accuracy class and higher level's calibration clock mark of itself clock；
Since crystal oscillator has the characteristics that short-term stability is high, long-time stability are poor, crystal oscillator period regulation timer, table are introduced
Show that the crystal oscillator clock calibrated is believable, itself clock signal of DMO terminals is effective, clock signal term of validity mark 1；If
It for a long time cannot be with high-precision signal source calibration (i.e. crystal oscillator period regulation timer expiry), then itself clock signal term of validity mark
It is 0；
DMO terminals in Idle state, according to crystal oscillator period regulation timer period with can receive it is high-grade when
Zhong Yuan does clock alignment, ensures the clock confidence level of master control DMO terminals.The reasonable period of clock alignment is crystal oscillator accuracy, letter
Road stability, suspend mode save what 3 factors of power consumption codetermined.For example, the duration of crystal oscillator period regulation timer can be set
It is set to 5~10 seconds, i.e., is calibrated every the clock of 5-10 seconds DMO terminals and reference clock (GPS, base station signal, High Precision Crystal Oscillator)
Once.
Clock and the principle of frequency adjustment are that main control terminal does not change clock in a continuous transmitting, only next time
The clock currently emitted is changed with certain step-length (such as 0.1ppm) when continuous transmitting starts, and is always maintained at this transmitting
Terminate.One-time continuous transmitting is defined as：The transmitting of continuous downlink subframe in tdd mode, or it is further added by other cycle constraints
Afterwards some in period (such as：10ms, 20ms or 300ms can be set to).
In the embodiment of the present application, the emission time alignment mechanism of multiple DMO main control terminals is as shown in Figure 1, DMO main control terminals
DMO is calculated according to the TA values that base station/cluster head provides and calls transmission timing, it is ensured that emits alignment between DMO main control terminals.DMO master
Control terminal to the transmission timing of fixed base stations shift to an earlier date 2t (t be base station/cluster head arrive the DMO main control terminals propagation delay), just with
The symbol aligned of base station.The 2t of each main control terminal is different, it is ensured that (i.e. each DMO master controls substantially aligned between DMO main control terminals
The transmitting signal of terminal reaches base station/cluster head simultaneously).
Timing synchronisation problem under DMO patterns is distinguished in terms of main control terminal and slave terminal behavior, but can be subdivided into
The scene of lower 4 classes：
Scene one：When DMO main control terminals are in the LTE trunked base station areas of coverage or double monitoring modes are (to resident base station
With DMO called terminals send business) time synchronization method：
All (master control) terminals are synchronized with base station downlink signal, adjustment downlink timing.
Base station obtains the TA values at the DMO terminal transmission moment of double monitored states by random access procedure, confirms double monitoring
DMO terminals will not interference base station uplink receiving.
The transmitting symbol of base station monitors DMO main control terminals, estimates TA values, issues main control terminal.
When DMO main control terminals have business, base station can utilize the reference signal of DMO main control terminals, periodically estimate
TA。
Scene two：When DMO main control terminals (not receiving base station signal) have GPS signal：
Each DMO main control terminals can be aligned with GPS timings.Emission time will be aligned between DMO main control terminals.
Scene three：When DMO main control terminals do not have the reference clock of the GPS/ Big Dippeves or base station：
DMO main control terminals are firstly the need of the relevant information (PSS/SSS/PBCH) for monitoring and receiving neighbouring DMO main control terminals.
Broadband DMO channel unmanned maintenance scenes, emission time are decided in its sole discretion simultaneously by DMO main control terminals when if the business of initiation
Confirm oneself to be cluster head.
Have other main control terminals if DMO channels and safeguards scene：Current main control terminal needs first to currently safeguarding DMO wide
The DMO main control terminals and other main control terminals of band channel (20MHz bandwidth, cluster head mechanism) carry out down-going synchronous.And identify cluster
Head (cluster head identifies in the similar broadcast messages of the PBCH of terminal).
Cluster head listens attentively to windowing mechanism process using PBCH's, and the transmission obtained between the DMO main control terminals and cluster head is inclined
Move TA values.Coordinate to be aligned with cluster head emission time between master control and (sends out the TA of some master control in the PBCH of cluster head, this cluster is made to emit base
This alignment).
The transmitting for listening attentively to windowing mechanism periodicmaintenance and cluster head that the DMO main control terminals of the business of progress pass through PBCH
Timing synchronization.In DMO main control terminal operations, assessment is also periodically tracked, tracks TA.Cluster head is periodically detected the DMO
The PSS/SSS or reference signal of main control terminal.
In the case of no high-precision GPS signal or base station signal, cluster head mechanism prevents from sending out between DMO main control terminals
Penetrate the endless loop of timing synchronization adjustment.A cluster head is selected in a rational power bracket (area of coverage).DMO terminals are elected
The necessary condition of cluster head is one or a combination set of following：Emit the strong DMO terminals of signal either the DMO terminals of clock standard or
Emit the DMO terminals of signal morning/maintenance channel morning.
Typical DMO networks have completely distributed and non-fully two kinds distributed.
In fully distributed DMO networks, cluster head must be selected inside DMO main control terminals.DMO main control terminals are necessary
There is business, when transmitting without business datum, terminal does not send out control signal, will not become DMO main control terminals.
In non-fully distributed network, some routing/control nodes do not have business datum that can also send out control signal,
As main controlled node, cluster head can also be become.
Election of cluster head is exemplified below with newer process：
Each main control terminal in overlay area receives the transmitted power rating information of neighbouring main control terminal, crystal oscillator essence
Spend the information such as grade, the grade after clock alignment and term of validity mark, cluster head mark, and synchronous with cluster head holding (cluster head is
Signal source of clock in regional area).
When the broad-band channel free time, without the signal of other main control terminals, first DMO main control terminal i.e. cluster
Head.Even if this DMO main control terminal crystal oscillator precision is low, transmission power is small.Even if later DMO main control terminal transmission powers are big,
Crystal oscillator precision height is also synchronous with original cluster head, and considers to reduce the interference to cluster head.
After the completion of an original business transmitting of cluster head, right of speech and master control qualification may be discharged.After this, if
There is another higher DMO main control terminal of transmission power bigger crystal oscillator precision in overlay area, then the DMO main control terminals can
To become bootstrapping or be elected as cluster head.
ENB/ cluster heads adjust cyclic counter triggering or the thresholding trigger process of DMO main control terminals TA：
ENB/ cluster heads detect DMO main control terminals PSS/SSS or reference signal, estimation DMO main control terminals relative to
The TA values of eNB/ cluster heads.TA adjust instructions can be according to the setting periodic triggers of cyclic counter, or once reach TA
The offset thresholding upper limit of adjustment, then trigger cluster head and send out TA adjust instructions.
Scene four：(the have confirmation or feedback) slave terminals DMO timing mechanism
DMO main control terminals adjust the emission time of the slave terminals DMO：It is anti-that the reception of DMO main control terminals belongs to the slave terminals DMO
When feedforward information, the TA distributed in random access according to these slave terminals DMO is whole in suitable uplink window reception DMO subordinates
Raise one's hand information and the feedback information at end.
DMO main control terminals must measure other DMO main control terminals, therefore when main control terminal is carrying out DMO business,
It is indispensable to listen attentively to window by PBCH between DMO main control terminals.Each DMO main control terminals, which utilize, " to conflict and finds and keep out of the way (random) window
Mouthful " method, monitor the clock accuracy grade of PBCH broadcast, higher level calibrates clock mark, PRB resource allocations, crystal oscillator period school
Quasi- timer, itself clock term of validity mark, timing adjustment step-length/opportunity of DMO terminal crystal oscillators, cluster head mark, cluster head are sent out
The information such as TA values.
In embodiments herein, the DMO main control terminals of DMO business are being carried out by configuring a random monitoring week
Phase, at the time of should send DM_PSS/DM_SSS/DM_PBCH signals in, using method of randomization, in multiple pseudo noise codes
At the time of determination, DM_PSS/DM_SSS/DM_PBCH signals are not sent；But monitor what other master controls on present channel were sent
DM_PSS/DM_SSS/DM_PBCH signals.It can obtain the transmitting offset between master control UE in this way, coordinate between main control terminal
Transmitting alignment.
To keep the technical principle, feature and technique effect of technical scheme clearer, below in conjunction with specific reality
Example is applied technical scheme is described in detail.
DMO terminals provided by the embodiments of the present application synchronize flow as shown in Fig. 2, including the following steps：
Step 201：DMO main control terminals are judged whether in LTE trunked base station coverage areas, if executing step 202,
It is no to then follow the steps 206.
Step 202：DMO terminals are synchronized with base station downlink signal.
Step 203：DMO main control terminal random access base station, base station obtain the TA values of DMO main control terminal emission times.
Step 204：DMO main control terminal transmitting business data.
Step 205：Base station utilizes DMO main control terminal reference signals, periodically adjusts the TA of main control terminal.Then terminate this
Flow.
Step 206：Judge whether DMO terminals can receive GPS signal, it is no to then follow the steps if executing step 207
208。
Step 207：DMO terminals are synchronized with GPS signal.
Step 208：DMO terminals receive neighbouring DMO main control terminals, the relevant information of cluster head.The broadcast control of DMO main control terminals
Information processed, for example, cluster head identifies, the clock accuracy class letter of terminal, higher level calibrates the information of clock, period regulation timing
Device, itself clock effective marker position, transmitted power rating.
Step 209：Judge whether DMO cluster heads, it is no to then follow the steps 210 if executing step 211.
Step 210：Carry out election of cluster head or using itself as cluster head.
Step 211：DMO main control terminals complete down-going synchronous according to current cluster head signal.
Step 212：Cluster head estimates that the delivery time of main control terminal in overlay area deviates TA values, and coordinates to send out between master control
It penetrates and is aligned constantly.
Step 213：The DMO main control terminals for carrying out business datum transmitting are synchronous with cluster head periodicmaintenance emission time.
Step 214：DMO main control terminal transmitting business data.
The foregoing is merely the preferred embodiments of the application, not to limit the protection domain of the application, it is all
Within the spirit and principle of technical scheme, any modification, equivalent substitution, improvement and etc. done should be included in this Shen
Within the scope of please protecting.
Claims (8)
1. a kind of method for synchronizing time of LTE network-off direct-passings DMO terminals, which is characterized in that including：
A, DMO terminals receive neighbouring DMO main control terminals, the relevant information of cluster head；
B, DMO main control terminals receive the control information of neighbouring DMO main control terminals broadcast and identify cluster head, the control packet
It is effective to include cluster head mark, the clock accuracy class letter of DMO terminals, higher level's calibration clock mark, period regulation timer, clock
Flag bit and transmitted power rating；
C, DMO main control terminals complete down-going synchronous according to current cluster head signal；
D, in cluster head estimation overlay area all DMO main control terminals TA values, and when coordinating to emit between the DMO main control terminals
Carve alignment；DMO main control terminal broadcast control messages, the DMO main control terminals emitted and cluster head periodicmaintenance emission time
It is synchronous.
2. according to the method described in claim 1, it is characterized in that, further comprising before step A：
Judge whether DMO main control terminals can receive GPS signal, if so, DMO main control terminals are according to period regulation timer period
Property be synchronized with GPS signal, and continue to execute step A, otherwise directly execute step A.
3. according to the method described in claim 1, it is characterized in that, further comprising before step A：
AA1, judge that DMO main control terminals whether in the LTE trunked base station areas of coverage, if executing step AA2, otherwise execute step
Rapid A；
AA2, DMO terminal are synchronized with base station downlink signal, and the clock frequency and radio frames for adjusting DMO terminals receive timing；Base station
The uplink timing advance TA values of DMO main control terminal emission times, DMO master terminal transmitting business are obtained by random access procedure
Data, base station utilize the reference signal of DMO main control terminals, periodically adjust the TA of DMO main control terminals；And terminate this flow.
4. according to the method described in claim 1, it is characterized in that, further comprising before step C：
DMO cluster heads are judged whether there is, if executing step C, otherwise, election of cluster head is carried out and selects a cluster head from DMO terminals
Or then DMO main control terminals execute step C using itself as cluster head.
5. according to the method described in claim 4, it is characterized in that, DMO terminals by the necessary condition of election cluster head be it is following it
One or combinations thereof：Emit the DMO of the strong DMO terminals of signal, the DMO terminals of clock standard, or transmitting signal morning/maintenance channel morning
Terminal.
6. according to the method described in claim 4, it is characterized in that, the cluster head estimates that all DMO master controls are whole in overlay area
The TA values at end detect the primary synchronization signal PSS/ secondary synchronization signals SSS of DMO main control terminals by cluster head or reference signal is realized.
7. according to the method described in claim 6, it is characterized in that, the DMO main control terminals emitted and cluster head period
Property safeguard that emission time is synchronized according to the setting periodic triggers of period regulation timer, or when the offset gate that reach TA adjustment
It is triggered when limiting the upper limit.
8. the method according to the description of claim 7 is characterized in that the period regulation timer when it is 5 seconds to 10 seconds a length of.
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| US10264541B2 (en) * | 2016-02-02 | 2019-04-16 | Qualcomm Incorporated | Operating mode coordination on a shared communication medium |
| CN108243436B (en) * | 2016-12-26 | 2021-01-05 | 展讯通信（上海）有限公司 | Time offset calibration method and device and mobile terminal |
| CN114501609B (en) * | 2022-03-30 | 2022-07-22 | 东集技术股份有限公司 | Communication networking method, device, storage medium and computer equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769870A (en) * | 2011-05-05 | 2012-11-07 | 苏州两江科技有限公司 | Low-energy-consumption time synchronization method of wireless sensor networks |
| WO2012161398A1 (en) * | 2011-05-20 | 2012-11-29 | Lg-Ericsson Co., Ltd. | Clustering apparatus and method for controlling timing |
| CN103327601A (en) * | 2012-03-23 | 2013-09-25 | 普天信息技术研究院有限公司 | Method and system achieving broadband colony offline straight communication |
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| US7688802B2 (en) * | 2008-05-23 | 2010-03-30 | Honeywell International Inc. | System and method for time synchronization in a wireless network |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102769870A (en) * | 2011-05-05 | 2012-11-07 | 苏州两江科技有限公司 | Low-energy-consumption time synchronization method of wireless sensor networks |
| WO2012161398A1 (en) * | 2011-05-20 | 2012-11-29 | Lg-Ericsson Co., Ltd. | Clustering apparatus and method for controlling timing |
| CN103327601A (en) * | 2012-03-23 | 2013-09-25 | 普天信息技术研究院有限公司 | Method and system achieving broadband colony offline straight communication |
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