CN104955146A - Time synchronization method of LTE DMO terminals - Google Patents

Time synchronization method of LTE DMO terminals Download PDF

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Publication number
CN104955146A
CN104955146A CN201410125509.9A CN201410125509A CN104955146A CN 104955146 A CN104955146 A CN 104955146A CN 201410125509 A CN201410125509 A CN 201410125509A CN 104955146 A CN104955146 A CN 104955146A
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dmo
main control
terminal
control terminal
clock
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CN104955146B (en
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强剑锋
王栋
吴恂
赵顾良
陈永
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Putian Information Technology Co Ltd
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Putian Information Technology Co Ltd
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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
    • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

The application discloses a time synchronization method of LTE direct mode operation DMO terminals. The time synchronization method comprises the steps that A. the DMO terminals receive related information of neighbor DMO master control terminals and cluster heads; B. the DMO master control terminals receive control information broadcasted by the neighbor DMO master control terminals and identify the cluster heads, and the control information includes cluster head identification, DMO terminal clock precision level identification, higher calibration clock identification, a periodic calibration timer, a clock effective marker position and emission power level; C. the DMO master control terminals complete downlink synchronization according to the control information; and D. the TA values of all the DMO master control terminal in the coverage area are estimated by the cluster heads, and the DMO master control terminals are coordinated to be aligned in emission time; and the DMO master control terminals broadcast the control information, and the DMO master control terminals for emission and the cluster heads periodically maintain synchronization of emission time.

Description

A kind of method for synchronizing time of LTE DMO terminal
Technical field
The application relates to wireless communication technology field, particularly relates to a kind of method for synchronizing time of LTE DMO terminal.
Background technology
The senior professional radio flagging dispatching patcher of a new generation that Digital Clustering mobile communication system is early 1990s, mid-term grows up.Digital clustering communication system is special command dispatching system, system channel adopts dynamic assignment mode, working method mostly is single work and semiduplex mode, the network coverage adopts great Qu MPS process, service set is wirelessly to converse to the wireless short time, service-user has priority and specific function, is applicable to group user and special user colony, belongs to private network communication system.Digital cluster communication grows up on the basis of simulation trunking communication, digital cluster communication is in signaling, multi-access mode, speech coding, each key techniques such as modulation /demodulation and channel control adopt digitized processing comprehensively, simultaneously based on the feature of digital system in conjunction with simultaneous techniques, error-detection error-correction technology and diversity technique etc., digital cluster communication is made to have anti-ability of bothering strong, high-quality long-distance transmissions, high level security, the properties such as the business adaptive capacity of high reliability and high flexible and the concatenation ability of Peripheral Interface, and the capacity of whole digital clustering communication system is larger, systems connection is more convenient.
Along with the development of mobile communication technology, people seek common ground while reserving difference as possible, make the demand of the professional multiple different majors department of mobile communication system energy As soon as possible Promising Policy of exploitation, pan-European trunked radio (TETRA, Trans European Trunked Radio) digital clustering communication system is exactly grow up under this background.TETRA digital clustering communication system can provide command scheduling, transfer of data and telephone service on same technology platform, the scheduling feature of multigroup group is not only provided, but also short data information service, packet data service and the service of digitized full duplex mobile phone can be provided.TETRA digital cluster system supports network-off direct-passing (DMO, Direct Mode Operation) mode, and DMO is the technology making travelling carriage realize in-plant direct communication when not having the network coverage or network service outages.Under DMO pattern, do not have the network equipment to participate in trunking communication end to end, clock synchronous can only be solved by DMO terminal (possessing the terminal of DMO function) oneself.
In TETRA system, DMO terminal utilizes embedded High Precision Crystal Oscillator and synchronized algorithm to complete clock synchronous.TETRA standard is to the requirement of crystal oscillator: precision higher than ± 2ppm, adjustment step-length 25 ~ 100Hz.TETRA DMO terminal (possessing the terminal of DMO function in TETRA system) just half-duplex can send voice by an arrowband frequency, so the wide filter of 25KHz just can force down, band is outer to be disturbed.Different TETRA DMO calling uses different 25KHz channels.The narrow band filter that the DMO interchannel interference that time irreversibility brings can be received machine forces down.So clock synchronous compares simplification.
If DMO communication will be realized in the wideband digital trunked mobile communication system based on LTE, in the system bandwidth of a 20HMz, hold multichannel DMO calling.Every road DMO calling takies some Physical Resource Block (PRB).If asynchronous between multichannel DMO calling in broadband, just have interference.LTE DMO system (possessing the LTE system of DMO function) can not use as TETRA DMO narrow band filter filter in broadband other DMO call out interfere with rational noise background.LTE DMO system needs new timing synchronisation mechanism to reduce interference in the asynchronous band caused.
The net synchronization capability of DMO communication mechanism to terminal based on TD-LTE technology proposes high requirement.The timing synchronisation problem of LTE DMO system is made up of following 3 parts:
The reference clock synchronization of DMO terminal: when can utilize GPS (Global Position System) (GPS) signal, all DMO terminals can be synchronous with gps signal; When gps signal is disabled, need the impact considering the timing slip that the frequency drift of terminal crystal oscillator clock causes.When lacking high accuracy external reference clock, the crystal oscillator frequency stability of DMO terminal, for the obvious effect of net synchronization capability, needs DMO terminal crystal oscillator periodic calibration.
The sign synchronization of DMO main control terminal and slave terminal: symbol and the radio frames of only having slave terminal alignment main control terminal, could correct demodulation.Slave terminal receives the synchronous and sign synchronization of synchronizing signal (the master sync signal PSS/ auxiliary synchronous signals SSS) achieve frame of main control terminal.
The x time alignment of multiple DMO main control terminal: in nearby sphere, when multiple DMO main control terminal of no center control are launched in the bandwidth carrier of 20MHz simultaneously, if there is no reliable sign synchronization mechanism, cause clock between each main control terminal can not be synchronous, will cause different DMO call out between band in interference.The radio signal propagation that DMO terminal dynamic position is introduced postpones to need alignment mechanism.
The timing synchronisation mechanism of LTE system can not completely for LTE DMO system.The terminal that same DMO calling is inner, calling terminal can estimate the uplink timing advance (TA) adjusting slave terminal, is similar to the TA adjustment process of LTE.Still have new difficulty as follows:
GPS or base station signal can as the time references of LTE DMO terminal.But in indoor, tunnel, the inferior scene without GPS/ base station signal in ground still needs the synchronous method based on crystal oscillator.
The x time alignment of multiple DMO main control terminal: in LTE system is alignment mutually between the Base Transmitter moment.Also need to adjust mutual alignment between DMO main control terminal x time.Even if the TA that long symbol cyclic extensions can reduce by two DMO master control UE offsets the chance exceeding FFT sample length window.
Summary of the invention
This application provides a kind of method for synchronizing time of LTE DMO terminal, can in the time synchronized without base station Scene realization DMO terminal.
The method for synchronizing time of a kind of LTE DMO terminal that the embodiment of the present application provides, comprising:
A, DMO terminal receives the relevant information of contiguous DMO main control terminal, bunch head;
B, DMO main control terminal receives the control information of contiguous DMO main control terminal broadcast, and described control information comprises a bunch leader knowledge, the clock accuracy class letter of DMO terminal, higher level calibrate clock mark, period regulation timer, clock effective marker position and emitting power grade;
C, DMO main control terminal completes down-going synchronous according to described control information;
D, bunch head estimate the TA value of all DMO main control terminal in overlay area, and coordinate x time alignment between described DMO main control terminal; DMO main control terminal broadcast control message, the DMO main control terminal of carrying out launching is synchronous with bunch head periodicmaintenance x time.
Preferably, taking a step forward of steps A comprises:
Judge whether DMO main control terminal can receive gps signal, and if so, DMO main control terminal is synchronized with gps signal according to period regulation timer period, and continue to perform steps A, otherwise directly perform steps A.
Preferably, taking a step forward of steps A comprises:
AA1, judge whether DMO main control terminal is in the LTE trunked base station area of coverage, if perform steps A A2, otherwise perform steps A;
AA2, DMO terminal synchronizes is in base station downlink signal, and clock frequency and the radio frames of adjustment DMO terminal receive timing; Base station obtains the uplink timing advance TA value of DMO main control terminal x time by random access procedure, DMO master terminal transmitting business data, and base station utilizes the reference signal of DMO main control terminal, periodically the TA of adjustment DMO main control terminal; And process ends.
Preferably, taking a step forward of step B comprises:
Judge whether DMO bunch of head, if perform step B, otherwise, carry out election of cluster head and select a bunch of head or DMO main control terminal using self as a bunch head from the punching of DMO terminal, then perform step B.
Preferably, DMO terminal is elected the necessary condition of bunch head to be following one or a combination set of: the DMO terminal transmitting strong, the DMO terminal of clock standard, or the morning/maintenance channel DMO terminal early that transmits.
Preferably, described bunch of head estimates that the TA value of all DMO main control terminal in overlay area detects master sync signal PSS/ auxiliary synchronous signals SSS or the reference signal realization of DMO main control terminal by bunch head.
Preferably, described in the DMO main control terminal of carrying out launching is synchronous with bunch head periodicmaintenance x time arranges periodic triggers according to period regulation timer, or to trigger when reaching the skew thresholding upper limit of TA adjustment.
Preferably, the duration of described period regulation timer is 5 seconds to 10 seconds.As can be seen from the above technical solutions, utilize gps signal, base station signal, or the reference clock sources such as High Precision Crystal Oscillator carry out the mechanism of periodic calibration to DMO terminal, propose the information that the clock accuracy class letter of terminal and higher level calibrate clock, and period regulation timer, the method for self clock effective marker position.Adopt the method, DMO terminal can be applied to the scene without GPS/ base station signal, and technical scheme is applicable to different terminal crystal oscillator precision, ensures calibration accuracy, saves power consumption of terminal.Propose the x time alignment mechanism utilizing eNB or bunch head periodically to coordinate multiple DMO main control terminal, effectively reduce the interference that DMO system inter-sync error causes.Among the DMO system that the application's scheme is applicable to adopt LTE modulation system or end-to-end (D2D) system.
Accompanying drawing explanation
Fig. 1 is the x time alignment mechanism schematic diagram of multiple DMO main control terminal in the embodiment of the present application;
The DMO terminal synchronizes schematic flow sheet that Fig. 2 provides for the embodiment of the present application;
Embodiment
The method for synchronizing time of a kind of LTE DMO terminal that the application provides, its basic fundamental thought is:
Introduce in DMO terminal broadcast information clock accuracy level value mark and higher level calibrate clock identify (such as GPS school is crossed, and eNB crosses in school, the grade of autonomous oscillating crystal).Gps clock precision is the highest, and eNB takes second place, and crystal oscillator is determined according to device accuracy.So, just can set up the clock source system of DMO system, DMO terminal is selected synchronous with high-precision clock source signals;
DMO terminal according to weighting algorithm (according to the clock of oneself and the source of centre frequency, and receive multiple just in timing, the centre frequency source of the DMO main control terminal of maintenance channel, by being multiplied by corresponding weights weighting) calculate the confidence level of oneself current clock that should use and centre frequency and correspondence; Send DM_PSS/DM_SSS/DM_PBCH signal according to the clock calculated and centre frequency, and broadcast the accuracy class of self clock and higher level calibrates clock mark;
Because crystal oscillator has, short-term stability is high, long-time stability are poor, introduces crystal oscillator period regulation timer, represents that the crystal oscillator clock calibrated is believable, and self clock signal of DMO terminal is effective, clock signal term of validity mark 1; If for a long time can not with high-precision signal source calibration (i.e. crystal oscillator period regulation timer expiry), then self clock signal term of validity is masked as 0;
DMO terminal, when Idle state, does clock alignment according to crystal oscillator period regulation timer period with the high-grade clock source that can receive, and ensures the clock confidence level of master control DMO terminal.The reasonable period of clock alignment is crystal oscillator accuracy, channel stability, dormancy saving power consumption 3 factors determine jointly.Such as, the duration of crystal oscillator period regulation timer can be set to 5 ~ 10 seconds, namely calibrate once every the clock of 5-10 DMO second terminal and reference clock (GPS, base station signal, High Precision Crystal Oscillator).
To be main control terminal do not change clock to the principle of clock and frequency adjustment in a continuous print is launched, only upper once sequential filming starts time to change the clock of current transmitting with certain step-length (such as 0.1ppm), and remain to this always and launch and terminate.One-time continuous transmitting is defined as: the transmitting of continuous descending sub frame in tdd mode, or increases certain cycle after other cycle constraint (such as: can be decided to be 10ms, 20ms or 300ms) again.
In the embodiment of the present application, as shown in Figure 1, DMO main control terminal calculates DMO calling according to the TA value that base station/bunch head provides and sends timing the x time alignment mechanism of multiple DMO main control terminal, guarantees to launch alignment between DMO main control terminal.The transmission timing advance 2t(t of DMO main control terminal to fixed base stations is the propagation delay of base station/bunch head to this DMO main control terminal), just and the symbol aligned of base station.The 2t of each main control terminal is different, guarantees substantially to align (namely transmitting of each DMO main control terminal arrives base station/bunch head simultaneously) between DMO main control terminal.
Timing synchronisation problem under DMO pattern is distinguished from main control terminal and behavior aspect, slave terminal, can be subdivided into again the scene of following 4 classes:
Scene one: when DMO main control terminal is in the LTE trunked base station area of coverage or the time synchronization method of two monitoring mode (sending business to resident base station and DMO terminal called):
All (master control) terminal synchronizes, in base station downlink signal, adjust descending timing.
Base station obtains the TA value in the DMO terminal transmission moment of two monitored state by random access procedure, confirm that two supervision DMO terminal can not the uplink receiving of interference base station.
The transmitting symbol of base station monitors DMO main control terminal, estimates TA value, issues main control terminal.
Time DMO main control terminal has a business, base station can utilize the reference signal of DMO main control terminal, periodically estimates TA.
Scene two: when DMO main control terminal (not receiving base station signal) has gps signal:
Each DMO main control terminal can be alignd with GPS timing.Between DMO main control terminal, x time will align.
Scene three: when DMO main control terminal does not have the reference clock of the GPS/ Big Dipper or base station:
First DMO main control terminal needs the relevant information (PSS/SSS/PBCH) monitoring and receive contiguous DMO main control terminal.
If broadband DMO channel unmanned maintenance scene during the business of initiation, x time is decided in its sole discretion by DMO main control terminal and confirmed oneself is a bunch head.
If DMO channel has other main control terminal and safeguards scene: current main control terminal needs first to safeguard that the DMO main control terminal of DMO broad-band channel (20MHz bandwidth, bunch head mechanism) and other main control terminal carry out down-going synchronous to current.And identify a bunch head (bunch head is identified in the similar broadcast message of the PBCH of terminal).
Bunch head utilizes that PBCH's listen attentively to windowing mechanism process, and the transmission obtained between this DMO main control terminal and bunch head offsets TA value.Coordinate align with a bunch head x time between master control (send out the TA of certain master control at the PBCH of bunch head, make this bunch launch basic alignment).
The DMO main control terminal of carrying out business by PBCH to listen attentively to windowing mechanism periodicmaintenance synchronous with the x time of bunch head.At DMO main control terminal operation, also periodically to follow the tracks of assessment, follow the tracks of TA.Bunch head periodically detects PSS/SSS or the reference signal of this DMO main control terminal.
When not having high-precision GPS signal or base station signal, bunch head mechanism prevents the endless loop of x time synchronous adjustment between DMO main control terminal.A bunch of head is selected in a rational power bracket (area of coverage).DMO terminal is elected the necessary condition of bunch head to be following one or a combination set of: the DMO terminal transmitting strong, or the DMO terminal of clock standard, or the morning/maintenance channel DMO terminal early that transmits.
Typical DMO network has completely distributed and distributed two kinds of non-fully.
In complete distributed DMO network, bunch head must be selected inside DMO main control terminal.DMO main control terminal must have business, and when not having business datum to launch, terminal does not send out control signal, also can not become DMO main control terminal.
In the distributed network of non-fully, some route/Controlling vertex do not have business datum can send out control signal yet, become main controlled node, can become a bunch head yet.
The process of election of cluster head and renewal is exemplified below:
Each main control terminal in overlay area receives the grade after the emitting power grade information of contiguous main control terminal, crystal oscillator accuracy class, clock alignment and the information such as term of validity mark, bunch leader will, and keeps synchronous (namely bunch head is the signal source of clock in regional area) with bunch head.
When the broad-band channel free time, there is no the signal of other main control terminal, first DMO main control terminal namely bunch head.Even if this DMO main control terminal crystal oscillator precision is low, transmitting power is little.Even if DMO main control terminal transmitting power is afterwards large, crystal oscillator precision is high also synchronous with original bunch head, and considers to reduce the interference to bunch head.
After business has been launched for the first time at original bunch, right of speech and master control qualification may be discharged.After this, if there is another DMO main control terminal that transmitting power larger crystal oscillator precision is higher in overlay area, then this DMO main control terminal just can become bootstrapping or be elected as a bunch head.
The cyclic counter of eNB/ bunch of head adjustment DMO main control terminal TA triggers or thresholding trigger process:
ENB/ bunch of head detects PSS/SSS or the reference signal of DMO main control terminal, estimates the TA value of DMO main control terminal relative to eNB/ bunch of head.TA adjusts instruction can arrange periodic triggers according to cyclic counter, or once reach the skew thresholding upper limit of TA adjustment, then trigger a bunch hair and go out TA and adjust instruction.
Scene four: (have confirm or feedback) DMO slave terminal timing mechanism
The x time of DMO main control terminal adjustment DMO slave terminal: DMO main control terminal receives when belonging to DMO slave terminal feedback information, the raise one's hand information of the TA distributed when Stochastic accessing according to these DMO slave terminals in the up window reception DMO slave terminal be applicable to and feedback information.
DMO main control terminal must measure other DMO main control terminal, and therefore when main control terminal carries out DMO business, between DMO main control terminal, to listen attentively to window indispensable for PBCH.Method that each DMO main control terminal utilizes " conflict finds and keeps out of the way (at random) window ", monitors the clock accuracy grade of PBCH broadcast, higher level calibrates clock mark, the information such as TA value that the timing adjustment step-length/opportunity of PRB Resourse Distribute, crystal oscillator period regulation timer, self clock term of validity mark, DMO terminal crystal oscillator, bunch leader knowledge, bunch hair go out.
In the embodiment of the application, carrying out the DMO main control terminal of DMO business by configuration random listening period, in the moment that should send DM_PSS/DM_SSS/DM_PBCH signal, utilize method of randomization, when multiple pseudo noise code is determined, do not send DM_PSS/DM_SSS/DM_PBCH signal; But the DM_PSS/DM_SSS/DM_PBCH signal that on monitoring present channel, other master control sends.The transmitting side-play amount between master control UE can be obtained like this, coordinate the transmitting alignment between main control terminal.
For making the know-why of technical scheme, feature and technique effect clearly, below in conjunction with specific embodiment, technical scheme is described in detail.
The DMO terminal synchronizes flow process that the embodiment of the present application provides as shown in Figure 2, comprises the steps:
Step 201: judge whether DMO main control terminal is in LTE trunked base station coverage, if perform step 202, otherwise performs step 206.
Step 202:DMO terminal synchronizes is in base station downlink signal.
Step 203:DMO main control terminal Stochastic accessing base station, base station obtains the TA value of DMO main control terminal x time.
Step 204:DMO main control terminal transmitting business data.
Step 205: base station utilizes DMO main control terminal reference signal, the periodically TA of adjustment main control terminal.Then process ends.
Step 206: judge whether DMO terminal can receive gps signal, if perform step 207, otherwise performs step 208.
Step 207:DMO terminal synchronizes is in gps signal.
Step 208:DMO terminal receives the relevant information of contiguous DMO main control terminal, bunch head.The broadcast control information of DMO main control terminal, such as, bunch leader is known, and the clock accuracy class letter of terminal, higher level calibrates the information of clock, period regulation timer, self clock effective marker position, emitting power grade.
Step 209: judge whether to there is DMO bunch of head, if perform step 211, otherwise performs step 210.
Step 210: carry out election of cluster head or using self as a bunch head.
Step 211:DMO main control terminal, according to current cluster head signal, completes down-going synchronous.
Step 212: bunch head estimates the delivery time skew TA value of main control terminal in overlay area, and coordinates x time alignment between master control.
Step 213: the DMO main control terminal of carrying out business datum transmitting is synchronous with bunch head periodicmaintenance x time.
Step 214:DMO main control terminal transmitting business data.
The foregoing is only the preferred embodiment of the application; not in order to limit the protection range of the application; within all spirit in technical scheme and principle, any amendment made, equivalent replacements, improvement etc., all should be included within scope that the application protects.

Claims (8)

1. a method for synchronizing time for LTE network-off direct-passing DMO terminal, is characterized in that, comprising:
A, DMO terminal receives the relevant information of contiguous DMO main control terminal, bunch head;
The control information that B, DMO main control terminal receives contiguous DMO main control terminal broadcast also identifies a bunch head, and described control information comprises a bunch leader knowledge, the clock accuracy class letter of DMO terminal, higher level calibrate clock mark, period regulation timer, clock effective marker position and emitting power grade;
C, DMO main control terminal completes down-going synchronous according to described control information;
D, bunch head estimate the TA value of all DMO main control terminal in overlay area, and coordinate x time alignment between described DMO main control terminal; DMO main control terminal broadcast control message, the DMO main control terminal of carrying out launching is synchronous with bunch head periodicmaintenance x time.
2. method according to claim 1, is characterized in that, taking a step forward of steps A comprises:
Judge whether DMO main control terminal can receive gps signal, and if so, DMO main control terminal is synchronized with gps signal according to period regulation timer period, and continue to perform steps A, otherwise directly perform steps A.
3. method according to claim 1, is characterized in that, taking a step forward of steps A comprises:
AA1, judge whether DMO main control terminal is in the LTE trunked base station area of coverage, if perform steps A A2, otherwise perform steps A;
AA2, DMO terminal synchronizes is in base station downlink signal, and clock frequency and the radio frames of adjustment DMO terminal receive timing; Base station obtains the uplink timing advance TA value of DMO main control terminal x time by random access procedure, DMO master terminal transmitting business data, and base station utilizes the reference signal of DMO main control terminal, periodically the TA of adjustment DMO main control terminal; And process ends.
4. method according to claim 1, is characterized in that, taking a step forward of step B comprises:
Judge whether DMO bunch of head, if perform step B, otherwise, carry out election of cluster head and select a bunch of head or DMO main control terminal using self as a bunch head from the punching of DMO terminal, then perform step B.
5. method according to claim 4, is characterized in that, DMO terminal is elected the necessary condition of bunch head to be following one or a combination set of: the DMO terminal transmitting strong, the DMO terminal of clock standard, or the morning/maintenance channel DMO terminal early that transmits.
6. method according to claim 4, is characterized in that, described bunch of head estimates that the TA value of all DMO main control terminal in overlay area detects master sync signal PSS/ auxiliary synchronous signals SSS or the reference signal realization of DMO main control terminal by bunch head.
7. method according to claim 6, it is characterized in that, described DMO main control terminal of carrying out launching is synchronous with bunch head periodicmaintenance x time arranges periodic triggers according to period regulation timer, or triggers when reaching the skew thresholding upper limit of TA adjustment.
8. method according to claim 7, is characterized in that, the duration of described period regulation timer is 5 seconds to 10 seconds.
CN201410125509.9A 2014-03-28 2014-03-28 A kind of method for synchronizing time of LTE DMO terminals Expired - Fee Related CN104955146B (en)

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