CN102348275A - Clock control method of multi-reference source input, device and base station - Google Patents
Clock control method of multi-reference source input, device and base station Download PDFInfo
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Abstract
The invention provides a clock control method of multi-reference source input, a device and a base station and belongs to the field of mobile communication. The clock control method comprises the following steps: A, selecting a first reference resource used for local clock synchronization from multiple reference sources; B, acquiring the current clock control parameters of a local clock; C, computing a first clock control parameter according to the current clock control parameters by the first reference source, wherein the first clock control parameter is used for synchronously adjusting the local clock; and D, adjusting the local clock in a stepping mode according to the first clock control parameter so as to make the local clock synchronous with the first reference source. When the reference sources are switched, the local clock can be ensured to be synchronized from the original reference source clock and smoothly transited to be synchronous with a new reference source.
Description
Technical field
The invention belongs to moving communicating field, relate in particular to a kind of clock control method, device and base station of many reference source inputs.
Background technology
If the base station can operate as normal, must with the clock synchronization of the clock or the upper-level BTS of transmission equipment.For the base station, accomplish the clock synchronization with transmission equipment, must receive the reference source that transmission equipment is input to the base station, and utilize the reference source of input and local clock to carry out could accomplishing each item work and the task of subsequent base stations synchronously.
But because different country; Different areas; Different environment and different operators use different transmission equipments; The reference source that makes transmission equipment can offer the base station has various ways; GPS (global positioning system) timing reference input for example, line clock reference source (wherein line clock can be divided into outside 2Mbps, outside 2MHz and transmission line recovered clock etc. again); The syncE reference source, the reference source of support IEEE1588 agreement and microwave signal reference source etc.According to the transmission equipment of the reality of each operator of base station, operator may provide one or more reference sources to supply base stations to use, and for example, the gps clock reference source only is provided, and line clock and IEEE1588 perhaps are provided two kinds of reference sources.
Because local clock is constantly to carry out synchronous calculation process with the reference source of selecting, when promptly reference source changed, local clock will inevitably change along with reference source.In order to ensure the operate as normal of base station, when reference source switches, need guarantee to make local clock from original reference source clock synchronization, be smoothly transitted into new reference source synchronous.
Yet, do not provide in the prior art when switching between a plurality of reference sources, how the related art scheme that local clock is controlled.
Summary of the invention
In order to address the above problem; The clock control method, device and the base station that the purpose of this invention is to provide a kind of many reference source inputs; Solved when switching between a plurality of reference sources, can guarantee local clock from original reference source clock synchronization, smooth excessiveness is to synchronous with new reference source.
In order to achieve the above object, this law invention provides a kind of clock control method of many reference source inputs, comprising:
Steps A, from a plurality of reference sources, select and be used for the first synchronous reference source of local clock;
Step B, obtain the current clock control parameter of said local clock;
Step C, according to said current clock control parameter, and utilize said first reference source to calculate the first clock control parameter;
Step D, said local clock is carried out stepping adjustment, make said local clock and said first reference source synchronous according to the said first clock control parameter.
Preferably, said first reference source is for when in a plurality of reference sources that satisfy setting in advance during the switchover policy between each reference source, the reference source of from said a plurality of reference sources, selecting according to said switchover policy.
Preferably, the switchover policy between said each reference source comprises: reference source switch according to configuration preference level switchover policy, reference source according to configuration sequence switchover policy, reference source according in current available not switchover policy and the arbitrary maintenance switchover policy of reference source any one or multiple.
4. clock control method according to claim 2 is characterized in that, when said first reference source takes place when unusual, said method also comprises:
According to the switchover policy between said each reference source, activate second reference source in said a plurality of reference source, and said first reference source of deexcitation;
According to the said first clock control parameter, and utilize said second reference source to calculate the second clock Control Parameter, said second clock Control Parameter is used for local clock is adjusted synchronously;
According to said second clock Control Parameter said local clock is carried out the stepping adjustment, make said local clock and said second reference source synchronous.
Preferably, before execution in step A, said clock control method also comprises:
The reference source inter-process strategy of each reference source in said a plurality of reference source is set in advance.
Preferably, said reference source inter-process strategy comprises: reference source internal abnormality shake strategy, reference source internal abnormality judge in the inner control step strategy of the transition strategy that detects strategy, reference source internal state and reference source any one or multiple.
Preferably, before carrying out said steps A, said method also comprises:
Judge in said a plurality of reference source whether the available reference source is arranged, if there is not then local clock free-running operation; If have, then carry out said steps A.
In order to achieve the above object, the present invention also provides a kind of clock control device of many reference source inputs, comprising:
Main control module is used for selecting from a plurality of reference sources and is used for the first synchronous reference source of local clock, and obtains the current clock control parameter of said local clock;
Clock module is connected with said main control module, is used for according to said current clock control parameter, and utilizes said first reference source to calculate the first clock control parameter;
Hardware module is connected with said clock module, is used to produce said local clock;
Executive Module is connected with hardware module with said clock module, is used for according to the said first clock control parameter said local clock being carried out the stepping adjustment, makes said local clock and said first reference source synchronous.
Preferably, said main control module also is used for taking place according to the switchover policy between each reference source, to activate second reference source in said a plurality of reference source when unusual when said first reference source, and said first reference source of deexcitation;
Said clock module also is used for according to the said first clock control parameter, and utilizes said second reference source to calculate the second clock Control Parameter, and said second clock Control Parameter is used for local clock is adjusted synchronously;
Said Executive Module also is used for according to said second clock Control Parameter said local clock being carried out the stepping adjustment, makes said local clock and said second reference source synchronous.
Preferably, said clock module comprises:
The reference source configuration interface is connected with said main control module, is used to receive the configuration information of each reference source that said main control module issues, and the reference source inter-process strategy of each reference source;
The reference source state detection unit is used to utilize said reference source inter-process strategy, and the result of reference source and the synchronous computing of local clock, judges whether the state of current reference source is normal;
The clock control parameter calculation unit is used to calculate the clock control parameter that is used for the synchronous adjustment of local clock;
The transition between states processing unit is used in local clock and reference source synchronizing process the transition between states of local clock being controlled.
Preferably, said hardware module comprises:
Clock circuit is connected with said Executive Module, is used to produce said local clock;
The reference source selected cell is used for selecting effective reference source from a plurality of reference sources;
The logical process arithmetic element; Be connected with said reference source selected cell with said clock circuit respectively; Be used for the input information according to each reference source, the input information of local clock and the configuration information of reference source; Calculate the relevant information of each reference source computing, supply said clock module subsequent calls.
Preferably, said clock control device also comprises:
Acquisition module is connected with said main control module with said clock module respectively, is used to gather the state information of reference source, and the state information that collects is fed back to said main control module.
Preferably, said clock control device also comprises:
Configuration module; Be connected with said main control module; Be used for being provided with in advance the switchover policy between said each reference source of a plurality of reference source; And the reference source inter-process strategy that is used for being provided with in advance said a plurality of each reference source of reference source, and give said main control module with the switchover policy between the said reference source and said reference source inter-process policy distribution.
In order to achieve the above object, the also logical a kind of base station of the present invention comprises:
Main control module is used for selecting from a plurality of reference sources and is used for the first synchronous reference source of local clock, and obtains the current clock control parameter of said local clock;
Clock module is connected with said main control module, is used for according to said current clock control parameter, and utilizes said first reference source to calculate the first clock control parameter;
Hardware module is connected with said clock module, is used to produce said local clock;
Executive Module is connected with hardware module with said clock module, is used for according to the said first clock control parameter said local clock being carried out the stepping adjustment, makes said local clock and said first reference source synchronous.
Preferably, said main control module also is used for taking place according to the switchover policy between each reference source, to activate second reference source in said a plurality of reference source when unusual when said first reference source, and said first reference source of deexcitation;
Said clock module also is used for according to the said first clock control parameter, and utilizes said second reference source to calculate the second clock Control Parameter, and said second clock Control Parameter is used for local clock is adjusted synchronously;
Said Executive Module also is used for according to said second clock Control Parameter said local clock being carried out the stepping adjustment, makes said local clock and said second reference source synchronous.
Can know by technique scheme; When carrying out the clock control of many reference source inputs; Obtain the current clock control parameter of local clock; Then according to current clock control parameter; Utilize selected reference source (reference source of activation) to calculate the clock control parameter; According to the clock control parameter that calculates local clock is carried out the stepping adjustment then; Make local clock and selected reference source synchronous; Because in the clock control process; The reference source that activates always arrives the relevant clock control parameter acquiring of last reference source to local clock; And on this basis, adjust synchronously; Thereby make when between reference source, switching, can guarantee that smooth excessiveness is to synchronous with new reference source from original reference source clock synchronization; The output clock stable of the crystal oscillator of local clock has effectively been guaranteed the output quality of local clock.
Secondly; Can be through the switchover policy between each reference source in a plurality of reference sources be set in advance; And this switchover policy is applied in the concrete reference source handoff procedure, thereby realized a plurality of reference sources are effectively managed, can make reference source require to switch according to user's strategy;
At last, the reference source inter-process strategy of each reference source in a plurality of reference sources can be set also,, realize effective management reference source itself through reference source inter-process strategy.
Description of drawings
Fig. 1 is the flow chart of the clock control method of many reference source inputs in the embodiments of the invention;
Fig. 2 is transition between states sketch map in the embodiments of the invention (a transition strategy 1);
Fig. 3 is transition between states sketch map in the embodiments of the invention (a transition strategy 2);
Fig. 4 is the structural representation of the clock control device of many reference source inputs in the embodiments of the invention;
Fig. 5 is the structural representation of hardware module in the embodiments of the invention.
Embodiment
In the present embodiment; When carrying out the clock control of many reference source inputs; At first obtain the current clock control parameter of local clock; Then according to current clock control parameter; And utilize selected reference source to calculate the clock control parameter; According to the clock control parameter that calculates local clock is carried out the stepping adjustment then; Make local clock and selected reference source synchronous; When selected reference source takes place when unusual; Can be according to predefined reference source strategy; From a plurality of reference sources, select effective reference source, thereby accomplish the hand-off process between the reference source.
In the present embodiment, in order better a plurality of reference sources effectively to be managed, the reference source strategy can be set in advance.Certainly, this reference source strategy also can be provided with or adjust in the practice process.This reference source strategy can be divided into common policy and special-purpose strategy, and wherein common policy mainly is to the switchover policy between each reference source in a plurality of reference sources, and special-purpose strategy mainly is the reference source inter-process strategy to each reference source.
Switchover policy between above-mentioned each reference source comprises: reference source switches according to configuration preference level switchover policy, reference source according to configuration sequence switchover policy, reference source according to current available not switchover policy, the arbitrary maintenance switchover policy of reference source and other self-defining reference source switchover policy, wherein
1) reference source is meant the strategy that switches according to user configured priority according to configuration preference level switchover policy, and promptly reference source is normal, and the reference source that priority is high then preferentially is chosen as current effective reference source.
2) reference source is meant the strategy that switches as priority according to user configured order according to the configuration sequence switchover policy, and promptly reference source is normal, and Pei Zhi reference source then preferentially is chosen as current effective reference source at first.
3) the current available not switchover policy of reference source; If be meant the while and deposit two kinds of reference sources; Reference source A and reference source B; Reference source A priority is high; Reference source B priority is low; And two kinds of reference sources are all normal; The base station at first can select reference source A as current activation reference source so; When reference source A is unusual, switch to reference source B, then reference source B becomes current activation reference source; Reference source A becomes the un-activation reference source; Recover just often and work as reference source A, also keep the reference source of reference source B, and do not switch to reference source A as current selection.
4) the arbitrary maintenance switchover policy of reference source, be meant that reference source is unusual after, reference source can not selected to switch to other available reference source, still keeps current reference source.
Certainly, do not limit the particular content of the switchover policy between each reference source in the present embodiment, above-mentioned switchover policy can be provided with according to actual conditions.
Above-mentioned reference source inter-process strategy comprises: reference source internal abnormality shake strategy, reference source internal abnormality are judged the control step strategy that transition strategy, the reference source of detection strategy, reference source internal state is inner etc.For each reference source inter-process strategy, the initial condition of acquiescence is arranged all to different reference sources.For every kind of reference source inter-process strategy of reference source, if the user does not reconfigure, reference source will keep the acquiescence initial policy to carry out.
1) reference source internal abnormality shake strategy mainly is to prevent unusual shake repeatedly, and the processing of unusual shake promptly is set; For example shake duration T unusually after 0 second, this reference source just reports and takes place unusually, after reference source recovers; Wanted duration T 1 second, this reference source just reports normally.Through above-mentioned setting, can prevent constantly to switch between the reference source;
2) the reference source internal abnormality judge to detect strategy, mainly is the thresholding of alarm and the criterion of judgement, for example with the number of the satellite number of GPS unusual thresholding or the decision criteria in source as a reference, perhaps with the phase place of reference source or frequency difference as decision criteria etc.;
3) the transition strategy of reference source internal state; Be meant between local clock and the reference source the several states in the synchronizing process or the transition strategy of link; Can carry out the definition again and the division of local clock transition between states condition according to the working condition of the reality of reference source.For example free-running operation, catch soon, follow the tracks of, the transition conditions between state such as maintenance or the link carries out definition again;
4) the inner control step strategy of reference source is meant the stepping control in reference source and the local clock synchronizing process, adjust according to actual conditions, if less demanding to clock stability, can strengthen stepping, thereby can save lock in time.If clock stability is had relatively high expectations, can reduce stepping, but need expend lock in time.
Certainly, do not limit the particular content of reference source inter-process strategy in the present embodiment, reference source inter-process strategy can be provided with according to actual conditions.
For the purpose, technical scheme and the advantage that make the embodiment of the invention is clearer,, the embodiment of the invention is done explanation in further detail below in conjunction with embodiment and accompanying drawing.At this, illustrative examples of the present invention and explanation are used to explain the present invention, but not as to qualification of the present invention.
Referring to Fig. 1, be the flow chart of the clock control method of many reference source inputs in the embodiments of the invention, concrete steps are following:
Before carrying out this step, the switchover policy between each reference source in a plurality of reference sources can be set in advance, above-mentioned first reference source is for when satisfying switchover policy, the reference source of from a plurality of reference sources, selecting according to said switchover policy.Through switchover policy is set, make it possible to effectively a plurality of reference sources managed.Introduction about switchover policy can be referring to top description.
In fact, before execution in step 101, can judge also whether available reference source (for example judging according to the state information of reference source) is arranged in a plurality of reference sources, if there is not then this local clock free-running operation; Otherwise, execution in step 101.
Above-mentioned clock control parameter can be the relevant parameter that is used to control clock crystal oscillator.
In the present embodiment, the above-mentioned first clock control parameter can be the relevant parameter that is used to control clock crystal oscillator.Be used for the clock control parameter of adjustment synchronously through combining the current clock control parameter of local clock, obtaining, can realize that from original reference source clock synchronization smooth excessiveness is to synchronous with new reference source.After obtaining this first clock control parameter, can write down this parameter, so that in subsequent step, use.
In the present embodiment, each reference source all has the control step strategy of acquiescence, certainly also can adjust the amplitude of stepping according to actual conditions, guarantees the output balance of local clock through the stepping adjustment, and is stable.
In the present embodiment, can obtain the state information of each reference source through acquisition module, when finding that current activation reference source takes place when unusual, but execution in step 105 is chosen other effective reference sources.
Just, after carrying out the reference source switching, all need on the basis of last clock control parameter, carry out the control adjustment of local clock.
Certainly, take place when unusual, also can from a plurality of reference sources, select other reference source according to the handling process in step 105～107, as the reference synchronization source of local clock at second reference source.
Can know by technique scheme; When carrying out the clock control of many reference source inputs; Obtain the current clock control parameter of local clock; Then according to current clock control parameter; Utilize selected reference source (reference source of activation) to calculate the clock control parameter; According to the clock control parameter that calculates local clock is carried out the stepping adjustment then; Make local clock and selected reference source synchronous; Because in the clock control process; The reference source that activates always arrives the relevant clock control parameter acquiring of last reference source to local clock; And on this basis, adjust synchronously; Thereby make when between reference source, switching, can guarantee that smooth excessiveness is to synchronous with new reference source from original reference source clock synchronization; The output clock stable of the crystal oscillator of local clock has effectively been guaranteed the output quality of local clock.
Secondly; Can be through the switchover policy between each reference source in a plurality of reference sources be set in advance; And this switchover policy is applied in the concrete reference source handoff procedure, thereby realized a plurality of reference sources are effectively managed, can make reference source require to switch according to user's strategy;
At last, the reference source inter-process strategy of each reference source in a plurality of reference sources can be set also,, realize effective management reference source itself through reference source inter-process strategy.
In the present embodiment, the transition strategy of the reference source internal state in the reference source inter-process strategy is referring to Fig. 2 and Fig. 3.When the initial condition of hypothesis local clock was " free-running operation " among Fig. 2, when satisfying condition A, the transition between states of local clock was to " catching " soon; At " catching soon " state, when satisfying condition C, transition between states is to " tracking ", and when satisfying condition B, transition between states is to " free-running operation "; When " tracking " state, when satisfying condition E, transition between states is to " maintenance ", and when satisfying condition D, transition between states is to " catching " soon; When " maintenance " state, when satisfying condition F, transition between states is to " tracking ".
When the initial condition of hypothesis local clock was " free-running operation " among Fig. 3, when satisfying condition A, the transition between states of local clock was to " catching " soon; At " catching soon " state, when satisfying condition B, transition between states is to " free-running operation ", and when satisfying condition C, transition between states is to " tracking "; At " tracking " state, when satisfying condition D, transition between states is to " catching " soon, and when satisfying condition E, transition between states is to " maintenance ", and when satisfying condition G, transition between states is to " free-running operation "; At " maintenance " state, when satisfying condition F, transition between states is to " tracking ", and when satisfying condition H, transition between states is to " free-running operation ".
Referring to Fig. 4, be the structural representation of the clock control device of many reference source inputs in the embodiments of the invention, this clock control device comprises:
In another embodiment of the present invention, above-mentioned main control module 401 also is used for taking place according to the switchover policy between each reference source, to activate second reference source in said a plurality of reference source when unusual when said first reference source, and said first reference source of deexcitation;
Above-mentioned clock module 402 also is used for according to the said first clock control parameter, and utilizes said second reference source to calculate the second clock Control Parameter, and said second clock Control Parameter is used for local clock is adjusted synchronously;
Above-mentioned Executive Module 404 also is used for according to said second clock Control Parameter said local clock being carried out the stepping adjustment, makes said local clock and said second reference source synchronous.
In another embodiment of the present invention, this clock control device also comprises:
In another embodiment of the present invention, this clock control device also comprises:
In another embodiment of the present invention, this clock module 402 comprises:
The reference source configuration interface is connected with main control module 401, is used to receive the configuration information of each reference source that said main control module 401 issues, and the reference source inter-process strategy of each reference source;
The reference source state detection unit is used to utilize reference source inter-process strategy, and the result of reference source and the synchronous computing of local clock, judges whether the state of current reference source is normal;
The clock control parameter calculation unit is used to calculate the clock control parameter that is used for the synchronous adjustment of local clock;
The transition between states processing unit is used in local clock and reference source synchronizing process the transition between states of local clock being controlled.
Referring to Fig. 5, be the structural representation of hardware module in the embodiments of the invention, this hardware module comprises:
Reference source selected cell 502 is used for selecting effective reference source from a plurality of reference sources;
For example can carry out choosing of reference source according to the switchover policy that is provided with in advance, the reference source of choosing is set to activate reference source, and the relevant information that will activate reference source sends to Logical processing unit 503, carries out correlation computations by Logical processing unit 503.
Logical process arithmetic element 503; Be connected with said reference source selected cell 502 with said clock circuit 501 respectively; Be used for the input information according to each reference source, the input information of local clock and the configuration information of reference source; Calculate the relevant information of each reference source computing, supply said clock module subsequent calls.
Continue to consult Fig. 4.In the present embodiment; The pre-configured relevant configuration information (for example type of the priority of reference source, reference source etc.) that above-mentioned main control module 401 is used for accomplishing configuration module 406 is delivered in the clock module 402; And the various information that collect from clock module 402 (reference source state for example; The alarm of reference source etc.) handle; The final configuration information that combines; And the information that collects, reach switching controls to many inputs reference source.
Above-mentioned acquisition module 405 is used for the status information capture of each reference source and reports main control module 401, is handled by main control module 401.
Above-mentioned clock module 402 comprises a plurality of reference source modules, and this reference source module is used to accomplish the processing to every kind of reference source, and the function of each reference source module comprises: 1) reference source configuration interface function (corresponding to the reference source configuration interface); 2) reference source status detection function (corresponding to the reference source state detection unit); 3) synchronous execution clock control CALCULATION OF PARAMETERS (corresponding to the clock control parameter calculation unit) between each reference source and the local clock; 4) the transition between states strategy of reference source and local clock synchronizing process is handled (corresponding to the transition between states processing unit); Wherein,
The reference source configuration interface can be used for receiving the configuration information of each reference source that main control module 401 issues and the reference source inter-process strategy of each reference source;
The reference source state detection unit mainly is according to user configured reference source inter-process strategy, in conjunction with the actual reference source and the result of the synchronous computing of local clock, provides the normal still unusual conclusion of current reference source.Reference source can divide two kinds of situation unusually, one of which: reference source is lost unusually, its two: reference source degrade unusually (the reference source quality can't satisfy available reference source standard or thresholding).
The timing parameter computing unit calculates the clock control parameter that is used for the synchronous adjustment of local clock.In order to make local clock and reference source synchronous, need adjust accordingly the carrying out of local clock, and the clock control parameter calculation unit is exactly the parameter that real-time output hardware module 403 (for example clock crystal oscillator) will be adjusted;
The transition between states processing unit is used for accomplishing the several states that local clock and reference source synchronizing process define or the mutual transfer processing of link.Transition conditions between the states such as for example local clock can be defined as free-running operation, catches soon, follows the tracks of, maintenance is carried out definition again; If the user does not carry out the definition again of transition conditions, then reference source then keeps initial transition definition.Can be about the transition between states strategy referring to Fig. 2 and Fig. 3.
Wherein in the relevant information for each reference source that obtains of clock module 402; Has only the current reference source that is in activation; Just have the authority (just carrying out the control adjustment of local clock according to the reference source that activates) of using Executive Module 404, other un-activation reference source does not then have authority.Promptly when activating certain reference source, reference source will be taken over the control of Executive Module 404.And certain reference source of deexcitation, reference source will lose the control of Executive Module 404, return to the initial condition of reference source simultaneously;
Produce the clock circuit 501 of local clock, according to the clock control parameter that Executive Module 404 transmits, the corresponding local clock of output;
Reference source selected cell 502 is for example selected effective reference source from reference source A, reference source B and reference source X, make the reference source input effectively, for example can select according to the switchover policy between each reference source in a plurality of reference sources;
Logical process arithmetic element 503; Three input ports and an output port are arranged; The input port that three input ports are respectively each reference source input port, local clock and the input port of configuration information; Combination by these three input informations; Logical process arithmetic element 503 will be through a series of logical process computings; Export the required essential information of each reference source computing, for clock module 402 follow-up call processing.
Below through a specific embodiment, introduce clock control device among the present invention and how to be implemented under a plurality of reference source initial conditions and to carry out clock control.
Suppose that the reference source of configuration comprises at present: reference source A, reference source B and reference source X.Wherein the common policy of reference source selects priority to switch strategy, and priority is respectively P1, P2 and P3, and P1＞P3＞P2.Special-purpose strategy for reference source; Reference source A selects the special-purpose strategy of acquiescence; Reference source B selects reference source internal abnormality shake strategy (according to strategy; Configuration parameter T0 and T1); Other acquiescence (the acquiescence stepped parameter is S); Reference source X selects control step strategy (configuration stepping Control Parameter M), other acquiescence for use.Through configuration module 406, can be delivered to main control module 401 to the relevant configuration information of reference source and switchover policy.Main control module 401 sorts according to priority earlier, priority the highest come training in rotation prostatitis, for example reference source A, reference source X, reference source B.Main control module 401 simultaneously can be the configuration information of each reference source, and special-purpose strategy, is delivered to clock module 402.Clock module 402 begins to carry out handled according to above-mentioned configuration information and special-purpose strategy.
A is selected in the hypothetical reference source, and reference source A will be activated so, has the control to hardware module 403 simultaneously.When exercising control, reference source A can at first obtain current clock control parameter P from Executive Module 404
0, reference source A can be at clock control parameter P
0According to the algorithm of reference source A, obtain clock control parameter P on the basis
A(P
ABe not fixed value), through this clock control parameter hardware module 403 is carried out the stepping adjustment, thereby reach reference source A and the synchronous gradually target of local clock.Owing to reference source A has taked acquiescence control step strategy (configuration stepping Control Parameter S), so each new PA that forms is less than S with the absolute value that PA is poor before.Calculating process in the reference source can be: reference source A at first obtains current clock control parameter P0 from Executive Module 404; Reference source A is input in the logic of hardware module; Local clock can carry out phase place or frequency range comparison with reference source A in logic; The output difference parameter; By difference parameter, original Control Parameter P0 and algorithmic formula, come constantly to calculate P
A
If reference source A takes place unusual, because reference source A does not have the configure dedicated strategy, reference source A at once can be by main control module 401 deexcitations so, thereby lose the control to hardware module 403.In power out of hand, reference source A can preserve current clock control parameter to hardware module 403, is designated as P
1
Special-purpose strategy by common policy between the system configuration reference source and reference source itself; Can make reference source require to switch according to user's strategy; Simultaneously because in handoff procedure; The reference source that is about to activate always arrives the clock control parameter acquiring of last reference source to hardware module 403; And the control of on this basis, carrying out hardware module 403 is adjusted; It (is that each reference source all has acquiescence control step strategy that the parameter amplitude of hardware module 403 adjustment simultaneously limits; Also can adjust the amplitude of stepping according to actual conditions); Thereby make when between a plurality of reference sources, switching; The output smoothing of assurance local clock, stable; Guaranteed in the reference source handoff procedure output quality of local clock.
Next introduce, after reference source configuration and policy configurations completion, reference source is how to switch in the present embodiment, and how various strategies come into force.
For example: clock module 402 obtains the configuration information below with reference to source 2Mbps/2MHz/GPS/SyncE; Special-purpose strategy also enters into force simultaneously; Each reference source all can carry out corresponding setting to hardware module 403, can be that each reference source of clock module 402 provides basic processing information to guarantee hardware module 403.
After reference source is configured; The initial condition of the reference source of each configuration is all thought normally; This moment, main control module 401 will be according to common policy, for example: priority is switched strategy and is selected suitable reference source as the reference source that is about to activation with the current available not switchover policy of reference source (to the gps clock reference source).
Because reference source 2Mbps comes the foremost, reference source 2Mbps is selected as current activation reference source so, and it has had the control to Executive Module 404, and it at first can obtain the initial clock control parameter P that Executive Module 404 is preserved
0 Acquisition module 405 can carry out status poll according to ordering rule to each reference source simultaneously, can normally carry out with the common policy that guarantees signal source.
Inner for each reference source, the transition strategy of the inside of reference source 2Mbps can be changed according to transition between states condition shown in Figure 2.Other special-purpose strategy keeps acquiescence.In running, reference source 2Mbps can show the state of this reference source, for example present located transition state, and current reference source normal or unusual.Reference source 2Mbps has two kinds unusually: reference source is lost with reference source and is degraded unusually.
And, can change according to transition between states condition shown in Figure 3 for the transition strategy of the inside of reference source 2MHz.Other special-purpose strategy keeps acquiescence.Other is with reference source 2Mbps.
For the gps clock reference source, when searching star, 0 time of continuous T, when number of satellite all less than 4 the time, the gps clock reference source reports unusually, when 1 time of continuous T, number of satellite is all more than or equal to 4 o'clock, the gps clock reference source reports normally.
For reference source SyncE, then according to the special-purpose strategy execution of acquiescence.
Get access to the control of Executive Module 404 for reference source 2Mbps after, can be at clock control parameter P
0On the radix, according to the algorithm of reference source 2Mbps, the real-time P that calculates
2mbpsControl Parameter through Executive Module 404, is configured the clock circuit 501 of hardware module 403, thereby the local clock output of clock circuit 501 is kept synchronously with reference source 2Mbps.It should be noted that the computing of the configuration parameter of the reality of hardware module 403 following: be adjacent twice P
2mbpsThe absolute value p of difference, if p is greater than or equal to acquiescence step value S, then configuration parameter is S, otherwise configuration parameter is p.
Pull out the input or otherwise of reference source 2Mbps, make reference source 2Mbps be in abnormality.Behind T0 second (60s), main control module 401 is understood deexcitation reference source 2Mbps so, and Executive Module 404 reservation clock control parameters are P1 simultaneously.
Because the state of reference source 2MHz is normal; Main control module 401 can select reference source 2MHz as current activation reference source so; Reference source 2MHz will get access to the control of Executive Module 404 so; Get access to clock control parameter P1 simultaneously; According to the algorithm of reference source 2MHz, the real-time P that calculates
2MHzControl Parameter through Executive Module 404, is carried out the stepped parameter configuration to the clock circuit 501 of hardware module 403, thereby the local clock output of clock circuit 501 is kept synchronously with reference source 2MHz.
Pull out the input or otherwise of reference source 2MHz, make reference source 2MHz be in abnormality.After 10 seconds so (acquiescence dithering process strategies); Reference source 2MHz reports unusually; Acquisition module 405 will be reported to main control module 401 to this unusually; Main control module 401 will be reference source 2MHz deexcitation; Regain the control of reference source 2Mhz to Executive Module 404, Executive Module 404 reservation clock control parameters are P simultaneously
2
If it is normal that reference source 2Mbps this moment recovers, main control module 401 can be reselected reference source 2Mbps as current activation reference source so.
If this moment, reference source 2Mbps also was in abnormality; Because this moment, gps clock reference source state was normal; Main control module 401 can select the gps clock reference source as current activation reference source so; The gps clock reference source will obtain the control of Executive Module 404 so, and the Control Parameter that gets access to Executive Module 404 simultaneously is P
2Gps clock reference source so, according to the algorithm of gps clock reference source, the real-time P that calculates
GPSThe clock control parameter through Executive Module 404, is carried out the stepped parameter configuration to the clock circuit 501 of hardware module 403, thereby the local clock output of clock circuit 501 is kept synchronously with the gps clock reference source.
If this moment, reference source 2Mbps/2MHz recovered normal; Because the user has set common policy: the current available not switchover policy of reference source (to the gps clock reference source); In other words; As long as the gps clock reference source can be used; So just can not switch on the task reference source; Only if the gps clock reference source is unavailable, just main control module 401 can carry out choosing again of reference source in order.
As long as when reference source 2Mbps/2MHz/GPS is all unavailable, reference source SyncE just might be chosen as current activation reference source by main control module 401 so.
Make a general survey of the whole service process; Big to each handoff procedure; Little application to each special-purpose strategy; All in various degree presented flexibility ratio, the operability of reference source in switching; Simultaneously since Control Parameter also in constantly reference source switches; Always on original basis, hardware module 403 is adjusted, guaranteed the stability of local clock output according to the stepping strategy that is provided with.
Introduce the concrete switching flow of reference source in the embodiments of the invention below in conjunction with Fig. 1 and Fig. 4.Disposed the various switchover policy of reference source as the user after, reference source will move according to the switchover policy of configuration, and the information of each configuration reference source state of the collection that acquisition module 405 can be real-time simultaneously offers main control module 401.Main control module 401 is selected best effectively reference source according to each reference source state and switchover policy, if current do not have the best effectively, then the clock circuit 501 of hardware module 403 is not subjected to the control of any reference source with free-running operation.
If current have a best effectively reference source; Main control module 401 can judge whether current activation reference source is exactly best effectively reference source so; If not; The current reference source of deexcitation then; Activate the effective reference source of current the best, and obtain the current Control Parameter of Executive Module 404 and the control of control module 404.If then current activation reference source continues operation.Activate reference source after the control that has had Executive Module 404, can calculate the clock control parameter, combine the Control Parameter stepping of reference source simultaneously, the clock output of stepping adjustment hardware module 403 according to the algorithm of reference source.
Base station reference source commonly used has the gps clock reference source, reference source 2Mbps, reference source 2MHz, line clock (E1/T1/STM1), reference source IEEE588, reference source SyncE etc. at present.
Suppose that the user selects the input reference source of reference source 2Mbps/2MHz/GPS/SyncE clock as the base station; The common policy of choosing is that priority is switched strategy and the current available not switchover policy of reference source (to the gps clock reference source); Reference source 2Mbps priority is 0; Reference source 2MHz priority is 0; Gps clock reference source priority is 1, and reference source SyncE priority is 2.Be reference source 2Mbps and reference source 2MHz priority greater than the gps clock reference source, reference source 2Mbps is identical with reference source 2MHz priority, and gps clock reference source priority is greater than reference source SyncE.Under the reference source 2MHz situation identical with reference source 2Mbps priority; Then by oneself, suppose that so main control module 401 final priority orders are followed successively by reference source 2Mbps, reference source 2MHz, gps clock reference source and reference source SyncE by main control module 401.
The special-purpose strategy of selecting for use for reference source 2Mbps: the transition strategy of reference source internal state, specific strategy are reference sources when just having activated, and local clock state transitions condition is seen shown in Figure 2.Other special-purpose strategy all adopts default policy (for example the Control Parameter stepping is S, and it is unusual to continue 10s, and reference source is unusual, and it is normal continuing 20s, and reference source is normal).
The special-purpose strategy of selecting for use for reference source 2Mbps: the transition strategy of reference source internal state, specific strategy are reference sources when just having activated, and local clock state transitions condition is seen shown in Figure 3.Other special-purpose strategy all adopts default policy (for example the Control Parameter stepping is S, and it is unusual to continue 10s, and reference source is unusual, and it is normal continuing 20s, and reference source is normal).
The special-purpose strategy of selecting for use for the gps clock reference source: 1) the reference source internal abnormality judge detect strategy (be GPS search star more than or equal to 4 o'clock for normal, be unusual less than 4 o'clock); 2) reference source internal abnormality shake strategy, when promptly to continue T0 (60s) second be unusual, GPS will report unusually, when lasting T1 (120s) for just often, GPS will report normally.Other special-purpose strategy all adopts default policy (for example the Control Parameter stepping is s).
For the special-purpose strategy that reference source SyncE selects for use, all adopt acquiescence (for example the Control Parameter stepping is S, and it is unusual to continue 10s, and reference source is unusual, and it is normal continuing 20s, and reference source is normal).
A kind of base station also is provided in an embodiment of the present invention, comprises:
Main control module is used for selecting from a plurality of reference sources and is used for the first synchronous reference source of local clock, and obtains the current clock control parameter of said local clock;
Clock module is connected with said main control module, is used for according to said current clock control parameter, and utilizes said first reference source to calculate the first clock control parameter, and the said first clock control parameter is used for local clock is adjusted synchronously;
Hardware module is connected with said clock module, is used to produce said local clock;
Executive Module is connected with hardware module with said clock module, is used for according to the said first clock control parameter said local clock being carried out the stepping adjustment, makes said local clock and said first reference source synchronous.
In another embodiment of the present invention, said main control module also is used for taking place according to the switchover policy between each reference source, to activate second reference source in said a plurality of reference source when unusual when said first reference source, and said first reference source of deexcitation;
Said clock module also is used for according to the said first clock control parameter, and utilizes said second reference source to calculate the second clock Control Parameter, and said second clock Control Parameter is used for local clock is adjusted synchronously;
Said Executive Module also is used for according to said second clock Control Parameter said local clock being carried out the stepping adjustment, makes said local clock and said second reference source synchronous.
The above only is a preferred implementation of the present invention; Should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; Can also make some improvement and retouching, these improvement and retouching also should be considered as protection scope of the present invention.
Claims (15)
1. the clock control method of the input of reference source more than a kind is characterized in that, comprising:
Steps A, from a plurality of reference sources, select and be used for the first synchronous reference source of local clock;
Step B, obtain the current clock control parameter of said local clock;
Step C, according to said current clock control parameter, and utilize said first reference source to calculate the first clock control parameter;
Step D, said local clock is carried out stepping adjustment, make said local clock and said first reference source synchronous according to the said first clock control parameter.
2. clock control method according to claim 1; It is characterized in that; Said first reference source is for when in a plurality of reference sources that satisfy setting in advance during the switchover policy between each reference source, the reference source of from said a plurality of reference sources, selecting according to said switchover policy.
3. clock control method according to claim 2; It is characterized in that the switchover policy between said each reference source comprises: reference source switch according to configuration preference level switchover policy, reference source according to configuration sequence switchover policy, reference source according in current available not switchover policy and the arbitrary maintenance switchover policy of reference source any one or multiple.
4. clock control method according to claim 2 is characterized in that, when said first reference source takes place when unusual, said method also comprises:
According to the switchover policy between said each reference source, activate second reference source in said a plurality of reference source, and said first reference source of deexcitation;
According to the said first clock control parameter, and utilize said second reference source to calculate the second clock Control Parameter, said second clock Control Parameter is used for local clock is adjusted synchronously;
According to said second clock Control Parameter said local clock is carried out the stepping adjustment, make said local clock and said second reference source synchronous.
5. clock control method according to claim 1 is characterized in that, before execution in step A, said clock control method also comprises:
The reference source inter-process strategy of each reference source in said a plurality of reference source is set in advance.
6. clock control method according to claim 5; It is characterized in that said reference source inter-process strategy comprises: reference source internal abnormality shake strategy, reference source internal abnormality judge in the inner control step strategy of the transition strategy that detects strategy, reference source internal state and reference source any one or multiple.
7. clock control method according to claim 2 is characterized in that, before carrying out said steps A, said method also comprises:
Judge in said a plurality of reference source whether the available reference source is arranged, if there is not then local clock free-running operation; If have, then carry out said steps A.
8. the clock control device of the input of reference source more than a kind is characterized in that, comprising:
Main control module is used for selecting from a plurality of reference sources and is used for the first synchronous reference source of local clock, and obtains the current clock control parameter of said local clock;
Clock module is connected with said main control module, is used for according to said current clock control parameter, and utilizes said first reference source to calculate the first clock control parameter;
Hardware module is connected with said clock module, is used to produce said local clock;
Executive Module is connected with hardware module with said clock module, is used for according to the said first clock control parameter said local clock being carried out the stepping adjustment, makes said local clock and said first reference source synchronous.
9. clock control device according to claim 8 is characterized in that, said main control module; Also be used for taking place when unusual when said first reference source; According to the switchover policy between each reference source, activate second reference source in said a plurality of reference source, and said first reference source of deexcitation;
Said clock module also is used for according to the said first clock control parameter, and utilizes said second reference source to calculate the second clock Control Parameter, and said second clock Control Parameter is used for local clock is adjusted synchronously;
Said Executive Module also is used for according to said second clock Control Parameter said local clock being carried out the stepping adjustment, makes said local clock and said second reference source synchronous.
10. clock control device according to claim 9 is characterized in that, said clock module comprises:
The reference source configuration interface is connected with said main control module, is used to receive the configuration information of each reference source that said main control module issues, and the reference source inter-process strategy of each reference source;
The reference source state detection unit is used to utilize said reference source inter-process strategy, and the result of reference source and the synchronous computing of local clock, judges whether the state of current reference source is normal;
The clock control parameter calculation unit is used to calculate the clock control parameter that is used for the synchronous adjustment of local clock;
The transition between states processing unit is used in local clock and reference source synchronizing process the transition between states of local clock being controlled.
11. clock control device according to claim 9 is characterized in that, said hardware module comprises:
Clock circuit is connected with said Executive Module, is used to produce said local clock;
The reference source selected cell is used for selecting effective reference source from a plurality of reference sources;
The logical process arithmetic element; Be connected with said reference source selected cell with said clock circuit respectively; Be used for the input information according to each reference source, the input information of local clock and the configuration information of reference source; Calculate the relevant information of each reference source computing, supply said clock module subsequent calls.
12. clock control device according to claim 9 is characterized in that, said clock control device also comprises:
Acquisition module is connected with said main control module with said clock module respectively, is used to gather the state information of reference source, and the state information that collects is fed back to said main control module.
13. clock control device according to claim 9 is characterized in that, said clock control device also comprises:
Configuration module; Be connected with said main control module; Be used for being provided with in advance the switchover policy between said each reference source of a plurality of reference source; And the reference source inter-process strategy that is used for being provided with in advance said a plurality of each reference source of reference source, and give said main control module with the switchover policy between the said reference source and said reference source inter-process policy distribution.
14. a base station is characterized in that, comprising:
Main control module is used for selecting from a plurality of reference sources and is used for the first synchronous reference source of local clock, and obtains the current clock control parameter of said local clock;
Clock module is connected with said main control module, is used for according to said current clock control parameter, and utilizes said first reference source to calculate the first clock control parameter;
Hardware module is connected with said clock module, is used to produce said local clock;
Executive Module is connected with hardware module with said clock module, is used for according to the said first clock control parameter said local clock being carried out the stepping adjustment, makes said local clock and said first reference source synchronous.
15. base station according to claim 14 is characterized in that, said main control module; Also be used for taking place when unusual when said first reference source; According to the switchover policy between each reference source, activate second reference source in said a plurality of reference source, and said first reference source of deexcitation;
Said clock module also is used for according to the said first clock control parameter, and utilizes said second reference source to calculate the second clock Control Parameter, and said second clock Control Parameter is used for local clock is adjusted synchronously;
Said Executive Module also is used for according to said second clock Control Parameter said local clock being carried out the stepping adjustment, makes said local clock and said second reference source synchronous.
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| CN201010243407.9A CN102348275B (en) | 2010-08-02 | 2010-08-02 | Clock control method of multi-reference source input, device and base station |
| PCT/CN2011/077687 WO2012016496A1 (en) | 2010-08-02 | 2011-07-27 | Clock control method, device and base station for input having multiple reference sources |
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| CN201010243407.9A CN102348275B (en) | 2010-08-02 | 2010-08-02 | Clock control method of multi-reference source input, device and base station |
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| GB2551327B (en) * | 2016-06-10 | 2020-02-19 | Bluwireless Tech Ltd | Clock synchronisation in wireless mesh communications networks |
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Also Published As
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| WO2012016496A1 (en) | 2012-02-09 |
| CN102348275B (en) | 2014-12-10 |
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