CN105792028A - Nesting protection implementation method and system - Google Patents
Nesting protection implementation method and system Download PDFInfo
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- CN105792028A CN105792028A CN201410812355.0A CN201410812355A CN105792028A CN 105792028 A CN105792028 A CN 105792028A CN 201410812355 A CN201410812355 A CN 201410812355A CN 105792028 A CN105792028 A CN 105792028A
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Abstract
The invention provides a nesting protection implementation method and system. The nesting protection implementation method comprises the steps: respectively configuring hold-off timers corresponding to different paths in a protection group, setting the set time of a hold-off timer corresponding to an innermost-layer path to be a specific value, and setting the set time of a hold-off timer corresponding to an outermost-layer path to be larger than the specific value; when detecting that a fault changes, acquiring the set time of a hold-off timer corresponding to a path, at which a fault-changed position is located; if the acquired set time is equal to the specific value, computing a state of the protection group; if the acquired set time is not equal to the specific value, starting the hold-off timer corresponding to the path, at which the fault-changed position is located; after the acquired set time of the hold-off timer is up, re-detecting whether the change of the fault does not change, and if the change of the fault does not change, computing the state of the protection group. According to the nesting protection implementation method and system, a problem that protection switching time is unnecessarily prolonged due to difference of work/protection path nesting levels in the existing standard technologies can be overcome.
Description
Technical field
The present invention relates to based on the protection control technology transmitting net, particularly relate to a kind of method and system realizing nested protection.
Background technology
Along with Network is increasing to the demand of bandwidth, operator and system manufacturer are constantly considering the problem of improvement business tranmission techniques always.The evolution of digital transmission network is also from the initial first generation digital transmission network based on T1/E1, experienced by the second filial generation digital transmission network based on SONET (Synchronous Optical Network)/SDH (SDH), develop into the third generation digital transmission network at present based on OTN (optical transfer network).Transmitting net as the next generation, network environment encountered for OTN is more complicated, and the survivability of its network is a critically important problem of OTN.
From network layer, current network can carry out multilayer nest, and the problem how coordinating to be positioned at the process of many levels pretection switch machine just highlights more.It is thus desirable to a kind of way, make server layer pretection switch machine solution problem before client layer switches generation.
G.873.1 the settling mode that standard is mentioned is all should to be furnished with, by each protection group, the problem that a hysteresis timer being available for allotment processes protection cascade/nesting.And this mode still suffers from some problems; when work or Protection path nesting protection level difference; protection group is unconfined has waited the unnecessary time; rather than quick protective switch; make the time meaningless growth of service disconnection, namely can not meet the situation that different path (work or the protection) level of nesting is different.
Summary of the invention
The technical problem to be solved in the present invention is the problem of the meaningless growth of protection switch time overcoming the work/Protection path level of nesting difference existed in existing standard technology to cause, it is provided that a kind of scheme protecting different paths in group to adopt different delay intervalometer.
In order to solve the problems referred to above, the invention provides a kind of method realizing nested protection, including:
It is respectively provided with in protection group the delay intervalometer that different paths are corresponding, the timing delaying intervalometer corresponding for path, innermost layer is disposed as particular value, the timing delaying intervalometer corresponding for outer layer path is set greater than described particular value；
When detecting that fault changes, obtain the timing delaying intervalometer that the path, place, position that changes of fault is corresponding, calculate protection group state when the timing got is described particular value；The delay intervalometer that the path, place, position that changes of startup separator is corresponding when the timing got is not for described particular value; after the timing of this delay intervalometer arrives, again detect whether the change that fault occurs does not change, when not changing, calculate protection group state.
Alternatively, path, described innermost layer is the path not comprising other protection group on path；Described outer layer path is the path comprising other protection group on path；
The described timing by delay intervalometer corresponding for outer layer path is set greater than described particular value and includes:
The timing delaying intervalometer corresponding for outer layer path is set to T1+T2；T1 is in the protection group that this outer layer path comprises, the maximum in the timing delaying intervalometer that each path is corresponding；T2 completes the time of pretection switch more than or equal to the protection group comprised.
Alternatively, described particular value is 0.
Alternatively, described delay intervalometer is arranged in the controller of protection system.
Alternatively, each described delay intervalometer lays respectively in the detector in path corresponding in protection system；
Described calculating protection group state includes:
Described detector the change that described fault occurs is reported controller within a protection system, described controller calculate protection group state.
Present invention also offers a kind of system realizing nested protection, including:
Delay intervalometer corresponding from different paths in protection group respectively；
Module is set; the delay intervalometer corresponding for being respectively provided with in protection group different paths; the timing delaying intervalometer corresponding for path, innermost layer is disposed as particular value, the timing delaying intervalometer corresponding for outer layer path is set greater than described particular value；
Perform module, for when detecting that fault changes, obtain the timing delaying intervalometer that path, place, position that fault changes is corresponding, calculate protection group state when the timing got is described particular value；The delay intervalometer that the path, place, position that changes of startup separator is corresponding when the timing got is not for described particular value; after the timing of this delay intervalometer arrives, again detect whether the change that fault occurs does not change, when not changing, calculate protection group state.
Alternatively, path, described innermost layer is the path not comprising other protection group on path；Described outer layer path is the path comprising other protection group on path；
Corresponding for the outer layer path timing delaying intervalometer is set greater than described particular value and refers to by the described module that arranges:
The timing delaying intervalometer corresponding for outer layer path is set to T1+T2 by the described module that arranges；T1 is in the protection group that this outer layer path comprises, the maximum in the timing delaying intervalometer that each path is corresponding；T2 completes the time of pretection switch more than or equal to the protection group comprised.
Alternatively, described particular value is 0.
Alternatively, described delay intervalometer and described execution module are arranged in the controller of protection system.
Alternatively, each described delay intervalometer lays respectively in the detector in path corresponding in protection system；
The detector in each path respectively arranges a described execution module；
Described execution module calculates protection group state and refers to:
The change that described fault occurs is reported the controller of place protection system by described execution module, described controller calculate protection group state.
Adopt the method for the invention and system, compared with prior art, reach to reduce the effect of service outage duration.
Accompanying drawing explanation
Fig. 1 is the schematic flow sheet that the embodiment of the present invention realizes the method for nesting protection；
Fig. 2 is protection system architecture schematic diagram.
Fig. 3 realizes, by controller, the schematic diagram that protection is nested.
Fig. 4 realizes, by detector, the schematic diagram that protection is nested.
Fig. 5 is the schematic diagram of OCH (optical channel) 1+1 protection operating path nesting OTS (optical transmission section layer) 1+1.
Detailed description of the invention
Below in conjunction with drawings and Examples, technical scheme is described in detail.
If it should be noted that do not conflict, the embodiment of the present invention and each feature in embodiment can be combined with each other, all within protection scope of the present invention.Although it addition, illustrate logical order in flow charts, but in some cases, it is possible to perform shown or described step with the order being different from herein.
Embodiments provide a kind of method realizing nested protection, as it is shown in figure 1, include:
It is respectively provided with in protection group the delay intervalometer that different paths are corresponding, the timing delaying intervalometer corresponding for path, innermost layer is disposed as particular value, the timing delaying intervalometer corresponding for outer layer path is set greater than described particular value；
When detecting that fault changes, obtain the timing delaying intervalometer that the path, place, position that changes of fault is corresponding, calculate protection group state when the timing got is described particular value；The delay intervalometer that the path, place, position that changes of startup separator is corresponding when the timing got is not for described particular value; after the timing of this delay intervalometer arrives, again detect whether the change that fault occurs does not change, when not changing, calculate protection group state.
Wherein, fault changes and includes fault generation and failure vanishes；Fault changes when producing into fault, and the change occurred does not change and refers to and still suffer from fault；When fault changes as failure vanishes, the change occurred does not change and refers to and be absent from fault.
Wherein, path, described innermost layer is the path not comprising other protection group on path, it is possible to be operating path can also be Protection path；Described outer layer path is the path comprising other protection group on path, it is possible to be operating path can also be Protection path；
The described timing by delay intervalometer corresponding for outer layer path is set greater than described particular value and specifically may include that
The timing delaying intervalometer corresponding for outer layer path is set to T1+T2；T1 is in the protection group that this outer layer path comprises, the maximum in the timing delaying intervalometer that each path is corresponding；T2 completes the time of pretection switch more than or equal to the protection group comprised.
Wherein, described particular value can be, but not limited to be 0.
Realizing in method in one, described delay intervalometer can be respectively positioned in the controller of protection system.
Realizing in method at another kind, each described delay intervalometer can lay respectively in protection system in the detector in corresponding path.
It is specific as follows that the above two that the embodiment of the present invention includes realizes method:
Method one: realize different path employing difference delay timer approach by arranging controller.
The framework of protection system is as shown in Figure 2; each protection system is made up of controller, multiple detector, multiple executor, agreement mediator four part; wherein detector is responsible for fault collection and is reported; controller is responsible for processing externally input and carrying out agreement calculating protection group end-state; executor is responsible for performing switching action, and delivery protocol signaling is responsible for by agreement mediator.
In order to realize the method that different path adopts difference to delay intervalometer (Holdoff-timer), different delay intervalometers can be enabled in the controller for different externally inputs (alarm), (Fig. 3 only depicts a delay intervalometer using as signal as shown in Figure 3, do not represent and delay intervalometer only one of which), delay intervalometer and be arranged in controller.
In method one, the described method realizing nesting protection comprises the following steps:
The first step starts the configuration of protection group.
It is TW1 that second step arranges the timing delaying intervalometer of first job path W1 in protection group; the timing delaying intervalometer of second operating path W2 is TW2; the like, the timing delaying intervalometer arranging n-th operating path WN is TWN.
It is TP1 that 3rd step arranges the timing delaying intervalometer of first Protection path P1 in protection group; the timing delaying intervalometer of second Protection path P2 is TP2; the like, the timing delaying intervalometer arranging m-th operating path PM is TPN.
In second, third step above-mentioned; the timing delaying intervalometer that the operating path/Protection path of innermost layer is corresponding is set to 0; directly comprise the timing M1 delaying intervalometer corresponding for path A1 (can be operating path can also be Protection path) of this innermost layer protection group (namely not comprising the protection group of other protection group in path) to be set greater than or equal to M (M is step-length, it is believed that the pretection switch of M time nexine can complete)；The timing M2 delaying intervalometer corresponding for the path M2 (can be operating path can also be Protection path) comprising path A1 place protection group is set greater than or equal to M1+M (can be, but not limited to as 2M)；By that analogy.
4th completes the configuration of protection group.
5th step, when Wi (or Pj) path failure changes, here to produce fault, detector detects that alarm report is to after controller, the timing of TWi (or TPj) checked by controller, if the timing of TWi (or TPj) is 0, then calculate agreement immediately and draw protection group state, if the timing of TWi (or TPj) is not 0, then start the delay intervalometer of TWi (or TPj), when TWi (or TPj) intervalometer lost efficacy (namely timing arrives), first check whether detector Wi (or Pj) still suffers from fault, if the fault of still suffering from (this fault can be different with the fault reported at first), then enter agreement to calculate, draw protection group state；If fault is absent from, then do not do any action.
Method two: realize different path employing difference delay timer approach by arranging detector.
The framework of protection system is as shown in Figure 2; each protection system is made up of controller, multiple detector, multiple executor, agreement mediator four part; wherein detector is responsible for fault collection and is reported; controller is responsible for processing externally input and carrying out agreement calculating protection group end-state; executor is responsible for performing switching action, and delivery protocol signaling is responsible for by agreement mediator.
In order to realize the method that different path adopts difference to delay intervalometer, different delay intervalometers can be enabled respectively in each detector, as shown in Figure 4, delay intervalometer and be arranged in detector (only depicting a delay intervalometer in Fig. 4 as signal, not represent and to delay intervalometer only one of which).
In method two, the described method realizing nesting protection comprises the following steps:
The first step arranges the detector in path, innermost layer, and arranging its timing delaying intervalometer is 0.
Second step arranges the detector in time nexine path, arranges its timing delaying intervalometer for being step-length more than or equal to M, M, it is believed that the pretection switch of M time nexine can complete.
……
N step arranges the detector in layer path of going out, and arranges its timing delaying intervalometer for more than or equal to (N-1) M.N is total number of plies.
N+1 walks, and configures the protection group of each layer.
N+2 walks, when the detector in i-th (i < N+1) layer path detects that fault changes, here to produce fault, it is not 0 through checking the timing delaying intervalometer of this layer of detector, then start the delay intervalometer of this layer, wait the time of (i-1) M, after the timing delaying intervalometer of this layer arrives, whether detection fault still suffers from fault, if the fault of still suffering from (this fault can be different with the fault reported at first), then this fault is reported the controller of correspondence, controller calculates through agreement, draw protection group state and be handed down to executor's execution；Fault is absent from else if, is not doing any action.
Illustrate the application of above-mentioned two method of the present invention below by two embodiments, the change occurred to produce fault as fault in the two embodiment illustrates, and situation during failure vanishes is similar:
The embodiment of method one:
Illustrate that controller realizes the method that protection nesting delays intervalometer for the protection nesting of Fig. 5.W in Fig. 4 refers to operating path, and p refers to Protection path.
Fig. 5 is the OCH1+1 schematic diagram protecting operating path nesting OTS1+1, and customer side is OCH1+1 protection, and service layer is OTS1+1 protection, and wherein the OTS1+1 protection of service layer only realizes at the operating path that customer side is OCH1+1 protection.
The first step first configures OTS1+1 protection group, and OTS1+1 protection group is positioned at innermost layer, and the timing delaying intervalometer that therefore operating path of OTS1+1 protection in protection group controller is delayed intervalometer and Protection path is disposed as 0.
Second step configuration OCH1+1 protection group; nested OTS1+1 protection group in operating path in OCH1+1 protection group; non-nesting in Protection path; therefore (T is not 0 the timing of the operating path delay intervalometer of OCH1+1 protection in protection group controller to be set to T; T completes the time of pretection switch more than or equal to nested OTS1+1 protection group), the timing delaying intervalometer of Protection path is set to 0.
3rd step is when breaking down in the position 1 being positioned on OTS1+1 protection group operating path; the detector of OTS1+1 protection group and the detector of OCH1+1 protection group all can detect alarm and offer respective controller; the controller of OTS1+1 protection group finds after receiving alarm that the timing delaying intervalometer of operating path is 0, calculates agreement immediately and must do well as switching state；The controller of OCH1+1 protection group finds after receiving alarm that the timing delaying intervalometer of operating path is T, then start this intervalometer, after timing T arrives, and now detector no alarm, then need not enter agreement, be left intact.
4th step is when breaking down in the position 2 being positioned on OCH1+1 protection group Protection path; the detector of OCH1+1 protection group can detect alarm and offer its controller; controller finds after receiving alarm that the timing delaying intervalometer of operating path is 0; then immediately enter agreement to calculate, show that protection group state is operating conditions.
The embodiment of method two:
Illustrate that detector realizes the method that protection nesting delays intervalometer for the protection nesting of Fig. 5.
Fig. 5 is the OCH1+1 schematic diagram protecting operating path nesting OTS1+1, and customer side is OCH1+1 protection, and service layer is OTS1+1 protection, and wherein the OTS1+1 protection of service layer only realizes at the operating path that customer side is OCH1+1 protection.
The first step first configures the delay intervalometer of OTS1+1 protected field internal detector, and OTS1+1 protection group is positioned at innermost layer, therefore the timing delaying intervalometer of OTS1+1 protected field internal detector is set to 0.
The delay intervalometer of second step configuration OCH1+1 protected field internal detector; nested OTS1+1 protection group in operating path in OCH1+1 protection group; non-nesting in Protection path; therefore the timing delaying intervalometer of the detector (not including in OTS1+1 protected field) on operating path in OCH1+1 protected field being set to T (T is not 0), the timing delaying intervalometer of the detector on Protection path is set to 0.
3rd step is when breaking down in the position 1 being positioned on OTS1+1 protection group operating path; the detector of OTS1+1 protection group and the detector of OCH1+1 protection group all can detect alarm; delaying the timing of intervalometer due to the detector of OTS1+1 protection group is 0; then alarm is offered immediately controller; controller calculates protection group state for switching state through agreement, is handed down to executor and performs；Delaying the timing of intervalometer due to the detector on OCH1+1 protection group operating path is T; therefore detector starts this delay intervalometer; after the timing of this delay intervalometer arrives; owing to OTS1+1 protection group has been carried out switching; fault disappears; therefore do not carry out any operation, namely not by alarm report to controller.
4th step is when breaking down in the position 2 being positioned on OCH1+1 protection group Protection path; the detector of OCH1+1 protection group can detect alarm; it is 0 owing on Protection path, the timing of intervalometer delayed by the detector of OCH1+1 protection group; therefore immediately alarm is offered OCH1+1 and protects group controller; controller enters agreement and calculates, and show that protection group state is operating conditions.
The embodiment of the present invention additionally provides a kind of system realizing nested protection, including:
Delay intervalometer corresponding from different paths in protection group respectively；
Module is set; the delay intervalometer corresponding for being respectively provided with in protection group different paths; the timing delaying intervalometer corresponding for path, innermost layer is disposed as particular value, the timing delaying intervalometer corresponding for outer layer path is set greater than described particular value；
Perform module, for when detecting that fault changes, obtain the timing delaying intervalometer that path, place, position that fault changes is corresponding, calculate protection group state when the timing got is described particular value；The delay intervalometer that the path, place, position that changes of startup separator is corresponding when the timing got is not for described particular value; after the timing of this delay intervalometer arrives, again detect whether the change that fault occurs does not change, when not changing, calculate protection group state.
Wherein, path, described innermost layer is the path not comprising other protection group on path；Described outer layer path is the path comprising other protection group on path；
Corresponding for the outer layer path timing delaying intervalometer is set greater than described particular value and may refer to by the described module that arranges:
The timing delaying intervalometer corresponding for outer layer path is set to T1+T2 by the described module that arranges；T1 is in the protection group that this outer layer path comprises, the maximum in the timing delaying intervalometer that each path is corresponding；T2 completes the time of pretection switch more than or equal to the protection group comprised.
Wherein, described particular value can be 0.
Wherein, described delay intervalometer and described execution module may be located in the controller of protection system.
Wherein, each described delay intervalometer can lay respectively in the detector in path corresponding in protection system；
The detector in each path can respectively arrange a described execution module；
Described execution module calculates protection group state and may refer to:
The change that described fault occurs is reported the controller of place protection system by described execution module, described controller calculate protection group state.
Certainly; the present invention also can have other various embodiments; when without departing substantially from present invention spirit and essence thereof; those of ordinary skill in the art are when can make various corresponding change and deformation according to the present invention, but these change accordingly and deform the scope of the claims that all should belong to the present invention.
Claims (10)
1. the method realizing nested protection, including:
It is respectively provided with in protection group the delay intervalometer that different paths are corresponding, the timing delaying intervalometer corresponding for path, innermost layer is disposed as particular value, the timing delaying intervalometer corresponding for outer layer path is set greater than described particular value；
When detecting that fault changes, obtain the timing delaying intervalometer that the path, place, position that changes of fault is corresponding, calculate protection group state when the timing got is described particular value；The delay intervalometer that the path, place, position that changes of startup separator is corresponding when the timing got is not for described particular value; after the timing of this delay intervalometer arrives, again detect whether the change that fault occurs does not change, when not changing, calculate protection group state.
2. the method for claim 1, it is characterised in that:
Path, described innermost layer is the path not comprising other protection group on path；Described outer layer path is the path comprising other protection group on path；
The described timing by delay intervalometer corresponding for outer layer path is set greater than described particular value and includes:
The timing delaying intervalometer corresponding for outer layer path is set to T1+T2；T1 is in the protection group that this outer layer path comprises, the maximum in the timing delaying intervalometer that each path is corresponding；T2 completes the time of pretection switch more than or equal to the protection group comprised.
3. the method for claim 1, it is characterised in that:
Described particular value is 0.
4. the method for claim 1, it is characterised in that:
Described delay intervalometer is arranged in the controller of protection system.
5. the method for claim 1, it is characterised in that:
Each described delay intervalometer lays respectively in the detector in path corresponding in protection system；
Described calculating protection group state includes:
Described detector the change that described fault occurs is reported controller within a protection system, described controller calculate protection group state.
6. the system realizing nested protection, it is characterised in that including:
Delay intervalometer corresponding from different paths in protection group respectively；
Module is set; the delay intervalometer corresponding for being respectively provided with in protection group different paths; the timing delaying intervalometer corresponding for path, innermost layer is disposed as particular value, the timing delaying intervalometer corresponding for outer layer path is set greater than described particular value；
Perform module, for when detecting that fault changes, obtain the timing delaying intervalometer that path, place, position that fault changes is corresponding, calculate protection group state when the timing got is described particular value；The delay intervalometer that the path, place, position that changes of startup separator is corresponding when the timing got is not for described particular value; after the timing of this delay intervalometer arrives, again detect whether the change that fault occurs does not change, when not changing, calculate protection group state.
7. system as claimed in claim 6, it is characterised in that:
Path, described innermost layer is the path not comprising other protection group on path；Described outer layer path is the path comprising other protection group on path；
Corresponding for the outer layer path timing delaying intervalometer is set greater than described particular value and refers to by the described module that arranges:
The timing delaying intervalometer corresponding for outer layer path is set to T1+T2 by the described module that arranges；T1 is in the protection group that this outer layer path comprises, the maximum in the timing delaying intervalometer that each path is corresponding；T2 completes the time of pretection switch more than or equal to the protection group comprised.
8. system as claimed in claim 6, it is characterised in that:
Described particular value is 0.
9. system as claimed in claim 6, it is characterised in that:
Described delay intervalometer and described execution module are arranged in the controller of protection system.
10. system as claimed in claim 6, it is characterised in that:
Each described delay intervalometer lays respectively in the detector in path corresponding in protection system；
The detector in each path respectively arranges a described execution module；
Described execution module calculates protection group state and refers to:
The change that described fault occurs is reported the controller of place protection system by described execution module, described controller calculate protection group state.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410812355.0A CN105792028B (en) | 2014-12-23 | 2014-12-23 | Method and system for realizing nesting protection |
| PCT/CN2015/097579 WO2016101826A1 (en) | 2014-12-23 | 2015-12-16 | Method and system for implementing nested protection |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410812355.0A CN105792028B (en) | 2014-12-23 | 2014-12-23 | Method and system for realizing nesting protection |
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| CN105792028B CN105792028B (en) | 2019-12-20 |
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| WO2024051060A1 (en) * | 2022-09-08 | 2024-03-14 | 烽火通信科技股份有限公司 | Method and system for cooperative management and control of protection switching of ip and optical networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115174363B (en) * | 2022-07-05 | 2024-04-12 | 云合智网(上海)技术有限公司 | Multi-protection group set fast switching method |
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| CN101499820A (en) * | 2008-02-01 | 2009-08-05 | 华为技术有限公司 | Protection method for service transmission and network appliance |
| CN101616344A (en) * | 2009-06-17 | 2009-12-30 | 中兴通讯股份有限公司 | Service protecting method and device based on ASON |
| CN102118301A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Tunnel protection method and device |
| US20140186019A1 (en) * | 2012-12-27 | 2014-07-03 | Abhishek Chaudhary | Methods and systems of preserving client overhead bytes in optical transport network tunneling applications |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103152094B (en) * | 2013-03-05 | 2015-04-15 | 烽火通信科技股份有限公司 | Multilayer protection switching method and device in optical network |
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- 2014-12-23 CN CN201410812355.0A patent/CN105792028B/en active Active
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- 2015-12-16 WO PCT/CN2015/097579 patent/WO2016101826A1/en active Application Filing
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101499820A (en) * | 2008-02-01 | 2009-08-05 | 华为技术有限公司 | Protection method for service transmission and network appliance |
| CN101616344A (en) * | 2009-06-17 | 2009-12-30 | 中兴通讯股份有限公司 | Service protecting method and device based on ASON |
| CN102118301A (en) * | 2009-12-31 | 2011-07-06 | 中兴通讯股份有限公司 | Tunnel protection method and device |
| US20140186019A1 (en) * | 2012-12-27 | 2014-07-03 | Abhishek Chaudhary | Methods and systems of preserving client overhead bytes in optical transport network tunneling applications |
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| WO2024051060A1 (en) * | 2022-09-08 | 2024-03-14 | 烽火通信科技股份有限公司 | Method and system for cooperative management and control of protection switching of ip and optical networks |
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| WO2016101826A1 (en) | 2016-06-30 |
| CN105792028B (en) | 2019-12-20 |
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