CN105307179B - Channel detection method and Channel Detection device - Google Patents
Channel detection method and Channel Detection device Download PDFInfo
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- CN105307179B CN105307179B CN201510623238.4A CN201510623238A CN105307179B CN 105307179 B CN105307179 B CN 105307179B CN 201510623238 A CN201510623238 A CN 201510623238A CN 105307179 B CN105307179 B CN 105307179B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
- H04W24/02—Arrangements for optimising operational condition
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Abstract
The present invention provides a kind of channel detection methods and Channel Detection device, wherein the channel detection method, comprising: sender judges whether Channel holding time terminates during busy channel transmits data；At the end of determining any secondary channel holding time, ECCA channel detection process is opened.According to the technical solution of the present invention, the condition that sender executes ECCA process and ICCA process can be specified, fairness of the sender when seizing unlicensed spectrum has been effectively ensured.
Description
Technical field
The present invention relates to fields of communication technology, fill in particular to a kind of channel detection method and a kind of Channel Detection
It sets.
Background technique
Currently, 3GPP proposes the concept of LAA (access of LTE Assisted Access, LTE auxiliary), for by LTE
The help of (Long Term Evolution, long term evolution) authorization frequency spectrum comes using unlicensed spectrum.And LTE network is using
When unauthorized frequency range, one of most important key point is to ensure that LAA system on the basis of fair friendly and existing can connect
Enter technology (such as Wi-Fi) to coexist.And there is no LBT's (Listen Before Talk, listem-before-talk) in traditional LTE system
Mechanism avoids collision, and in order to preferably coexist with Wi-Fi, LTE system needs a kind of LBT mechanism.In this way, LTE is unauthorized
If detecting channel busy on frequency spectrum, the frequency range cannot be occupied, if detecting the channel spare time, could be occupied.
Based on the above issues, it proposes in the related technology a kind of based on LBE (Load based equipment, based on negative
The equipment of load) LBT mechanism, the LBT mechanism based on LBE is no periodic as shown in Figure 1:, as long as business reach, trigger
CCA detection sends signaling or data if CCA detection is idle at once；If detecting channel busy, a random number N, N are taken
Value range be 1 arrive q, wherein q is the length of competition window, and value range is 4 to 32.Fig. 1 shows the feelings of q=16
Condition, at this point, channel maximum holding time is (13/32) × q=6.5ms when detecting channel idle.After 6.5ms, adopt
ECCA (i.e. Extended CCA) mechanism is taken, i.e., and the range of random value N, N are 1 to q, if value is 8, then it represents that connecing
In the continuous CCA detection time got off, each CCA detection time will detect channel, if detecting channel idle, N-1,
If detecting channel busy, N is constant, when N is 0, sends signaling or data.
In addition, in order to further with Wi-Fi keep fairness, LBE take different ICCA (initial CCA) and
The value of ECCA, wherein the detection of first time CCA is known as ICCA, this time granularity is bigger, such as 34us；When detecting channel
The time granularity of ECCA after the cut-off of busy or Channel holding time is smaller, such as 9us.Meanwhile as shown in Fig. 2, believing
In road detection, if detecting channel busy, to increase a defer period (delay time), the value of the defer period
It is suitable with the value of initial CCA, that is to say, that must to detect channel idle for a long time again, N-1 could be continued.
It due to there is certain size when each data packet reaches, and is in general all to need multiple maximum letters
Road holding time can just transfer.If the value of competition window q may be larger in the case where channel is busier, lead to ECCA
Process required for the time will be very long.So after a Channel holding time terminates, sending point may be without
ECCA process, but primary initial ICCA Channel Detection is carried out before data transmission, it easier than ECCA process will rob in this way
Channel is accounted for, but this way affects fairness of the sending point when seizing unlicensed spectrum.
Therefore, how clear sending point executes the condition of ECCA process and ICCA process, to guarantee that sending point is being robbed
Fairness when accounting for unlicensed spectrum becomes technical problem urgently to be resolved.
Summary of the invention
The present invention is based at least one above-mentioned technical problem, proposes a kind of new Channel Detection scheme, Ke Yiming
True sender executes the condition of ECCA process and ICCA process, and justice of the sender when seizing unlicensed spectrum has been effectively ensured
Property.
In view of this, according to the first aspect of the invention, proposing a kind of channel detection method, comprising: sender is accounting for
During with channel transmission data, judge whether Channel holding time terminates；Terminate in any secondary channel holding time of judgement
When, open ECCA channel detection process.
In the technical scheme, by a Channel holding time in office at the end of open ECCA channel detection process, can
ICCA channel detection process is carried out after Channel holding time to avoid sender and compares and carries out ECCA channel detection process
Other sending points be easier to rob the problem of accounting for channel, effectively ensure different senders seizing unlicensed spectrum send
Fairness when data.Wherein, Channel holding time terminates to include following two situation: one is the durations of busy channel to reach
Maximum channel holding time；Another kind is that the data in buffer area (buffer) are all transmitted.
In the above-mentioned technical solutions, it is preferable that after opening the ECCA channel detection process, further includes: described
At the end of ECCA channel detection process, data to be transmitted are judged whether there is；If it is determined that the data to be transmitted are not present,
Then enter idle state, and when the data to be transmitted reach, starts ICCA channel detection process；Believed according to the ICCA
The testing result of road detection process determines whether to send the data to be transmitted.
In any of the above-described technical solution, it is preferable that after opening the ECCA channel detection process, further includes: if
Data to be transmitted have existed when the ECCA channel detection process is opened or the data to be transmitted are in the ECCA
Channel detection process reaches before terminating, then after the ECCA channel detection process, according to the ECCA Channel Detection
The testing result of process determines whether to send the data to be transmitted.
In any of the above-described technical solution, it is preferable that after opening the ECCA channel detection process, further includes: if
Data to be transmitted reach before the ECCA channel detection process terminates, then at the end of the ECCA channel detection process
Or when the data to be transmitted reach, the ECCA channel detection process is restarted, and according to restarting
The testing result of ECCA channel detection process determines whether to send the data to be transmitted.
In any of the above-described technical solution, it is preferable that further include:
After a Channel holding time in office, and before opening the ECCA channel detection process, defer is executed
Period process；And
In the ECCA channel detection process, if any ECCA detects granularity Detection to channel busy, described any
ECCA executes defer period process after detecting granularity.
According to the second aspect of the invention, it is also proposed that a kind of Channel Detection device, comprising: the first judging unit is used for
Sender judges whether Channel holding time terminates during busy channel transmits data；Processing unit, for described
At the end of first judging unit determines any secondary channel holding time, ECCA channel detection process is opened.
In the technical scheme, by a Channel holding time in office at the end of open ECCA channel detection process, can
ICCA channel detection process is carried out after Channel holding time to avoid sender and compares and carries out ECCA channel detection process
Other sending points be easier to rob the problem of accounting for channel, effectively ensure different senders seizing unlicensed spectrum send
Fairness when data.Wherein, Channel holding time terminates to include following two situation: one is the durations of busy channel to reach
Maximum channel holding time；Another kind is that the data in buffer area (buffer) are all transmitted.
In any of the above-described technical solution, it is preferable that further include: second judgment unit, for being examined in the ECCA channel
At the end of survey process, data to be transmitted are judged whether there is；The processing unit is also used to, and is sentenced in the second judgment unit
When the data to be transmitted being not present surely, control described sender enters idle state, and arrives in the data to be transmitted
Up to when, start ICCA channel detection process；The Channel Detection device further include: the first transmission unit, for according to
The testing result of ICCA channel detection process determines whether to send the data to be transmitted.
In any of the above-described technical solution, it is preferable that further include: the second transmission unit, if data to be transmitted are described
ECCA channel detection process has existed when opening or the data to be transmitted are in the ECCA channel detection process terminates it
Preceding arrival determines then after the ECCA channel detection process according to the testing result of the ECCA channel detection process
Whether the to be transmitted data are sent.
In any of the above-described technical solution, it is preferable that the processing unit is also used to, if data to be transmitted are described
ECCA channel detection process reaches before terminating, then at the end of the ECCA channel detection process or in the number to be transmitted
When according to reaching, the ECCA channel detection process is restarted；The Channel Detection device further include: third transmission unit is used
Determine whether to send the data to be transmitted in the testing result of the ECCA channel detection process according to restarting.
In any of the above-described technical solution, it is preferable that the processing unit is also used to:
After a Channel holding time in office, and before opening the ECCA channel detection process, defer is executed
Period process；And
In the ECCA channel detection process, if any ECCA detects granularity Detection to channel busy, described any
ECCA executes defer period process after detecting granularity.
By above technical scheme, the condition that sender executes ECCA process and ICCA process can be specified, is effectively ensured
Fairness of the sender when seizing unlicensed spectrum.
Detailed description of the invention
Fig. 1 shows the frame structure schematic diagram of the LBT mechanism based on LBE；
Fig. 2 shows the frame structure schematic diagrames for the LBE mechanism for including defer period process；
Fig. 3 shows the schematic flow diagram of the channel detection method of embodiment according to the present invention；
Fig. 4 shows the schematic block diagram of the Channel Detection device of embodiment according to the present invention；
Fig. 5 shows the schematic block diagram of the base station of embodiment according to the present invention；
Fig. 6 shows the schematic block diagram of the terminal of embodiment according to the present invention.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, protection scope of the present invention is not by described below
Specific embodiment limitation.
Fig. 3 shows the schematic flow diagram of the channel detection method of embodiment according to the present invention.
As shown in figure 3, the channel detection method of embodiment according to the present invention, comprising:
Step 302, sender judges whether Channel holding time terminates during busy channel transmits data；
Step 304, at the end of determining any secondary channel holding time, ECCA channel detection process is opened.
In the technical scheme, by a Channel holding time in office at the end of open ECCA channel detection process, can
ICCA channel detection process is carried out after Channel holding time to avoid sender and compares and carries out ECCA channel detection process
Other sending points be easier to rob the problem of accounting for channel, effectively ensure different senders seizing unlicensed spectrum send
Fairness when data.Wherein, Channel holding time terminates to include following two situation: one is the durations of busy channel to reach
Maximum channel holding time；Another kind is that the data in buffer area (buffer) are all transmitted.
In the above-mentioned technical solutions, it is preferable that after opening the ECCA channel detection process, further includes: described
At the end of ECCA channel detection process, data to be transmitted are judged whether there is；If it is determined that the data to be transmitted are not present,
Then enter idle state, and when the data to be transmitted reach, starts ICCA channel detection process；Believed according to the ICCA
The testing result of road detection process determines whether to send the data to be transmitted.
The technical solution specifies that sender executes the condition of ICCA process, specifically, when ECCA channel detection process knot
Shu Shi, if data to be transmitted do not reach yet, sender can enter idle state, when the data of available for transmission, execute
ICCA channel detection process.Wherein, determined whether to send data to be transmitted according to the testing result of ICCA channel detection process
The step of specifically include: if ICCA channel detection process detects channel idle, send data to be transmitted；If ICCA channel
Detection process detects channel busy, then does not send data to be transmitted.
In any of the above-described technical solution, it is preferable that after opening the ECCA channel detection process, further includes: if
Data to be transmitted have existed when the ECCA channel detection process is opened or the data to be transmitted are in the ECCA
Channel detection process reaches before terminating, then after the ECCA channel detection process, according to the ECCA Channel Detection
The testing result of process determines whether to send the data to be transmitted.
Wherein, determine whether that the step of sending data to be transmitted is specific according to the testing result of ECCA channel detection process
If including: that ECCA channel detection process detects channel idle, data to be transmitted are sent；If ECCA channel detection process is examined
Channel busy is measured, then does not send data to be transmitted.
In any of the above-described technical solution, it is preferable that after opening the ECCA channel detection process, further includes: if
Data to be transmitted reach before the ECCA channel detection process terminates, then at the end of the ECCA channel detection process
Or when the data to be transmitted reach, the ECCA channel detection process is restarted, and according to restarting
The testing result of ECCA channel detection process determines whether to send the data to be transmitted.
Wherein, determine whether to send data to be transmitted according to the testing result of the ECCA channel detection process of restarting
The step of specifically include: if restarting ECCA channel detection process detect channel idle, send data to be transmitted；
If the ECCA channel detection process of restarting detects channel busy, data to be transmitted are not sent.
In any of the above-described technical solution, it is preferable that further include:
After a Channel holding time in office, and before opening the ECCA channel detection process, defer is executed
Period process；And
In the ECCA channel detection process, if any ECCA detects granularity Detection to channel busy, described any
ECCA executes defer period process after detecting granularity.
Fig. 4 shows the schematic block diagram of the Channel Detection device of embodiment according to the present invention.
As shown in figure 4, the Channel Detection device 400 of embodiment according to the present invention, comprising: 402 He of the first judging unit
Processing unit 404.
Wherein, the first judging unit 402 judges that channel accounts for for sender during busy channel transmits data
Whether terminated with the time；Processing unit 404, for determining any secondary channel holding time knot in first judging unit 402
Shu Shi opens ECCA channel detection process.
In the technical scheme, by a Channel holding time in office at the end of open ECCA channel detection process, can
ICCA channel detection process is carried out after Channel holding time to avoid sender and compares and carries out ECCA channel detection process
Other sending points be easier to rob the problem of accounting for channel, effectively ensure different senders seizing unlicensed spectrum send
Fairness when data.Wherein, Channel holding time terminates to include following two situation: one is the durations of busy channel to reach
Maximum channel holding time；Another kind is that the data in buffer area (buffer) are all transmitted.
In any of the above-described technical solution, it is preferable that further include: second judgment unit 406, in the ECCA channel
At the end of detection process, data to be transmitted are judged whether there is；The processing unit 404 is also used to, in second judgement
Unit 406 determines that control described sender enters idle state, and described to be transmitted there is no when the data to be transmitted
Data reach when, start ICCA channel detection process；The Channel Detection device 400 further include: the first transmission unit 408,
For being determined whether to send the data to be transmitted according to the testing result of the ICCA channel detection process.
The technical solution specifies that sender executes the condition of ICCA process, specifically, when ECCA channel detection process knot
Shu Shi, if data to be transmitted do not reach yet, sender can enter idle state, when the data of available for transmission, execute
ICCA channel detection process.Wherein, determined whether to send data to be transmitted according to the testing result of ICCA channel detection process
The step of specifically include: if ICCA channel detection process detects channel idle, send data to be transmitted；If ICCA channel
Detection process detects channel busy, then does not send data to be transmitted.
In any of the above-described technical solution, it is preferable that further include: the second transmission unit 410, if data to be transmitted are in institute
It is had existed when stating the unlatching of ECCA channel detection process or the data to be transmitted terminates in the ECCA channel detection process
It reaches before, then after the ECCA channel detection process, the testing result according to the ECCA channel detection process is true
It is fixed whether to send the data to be transmitted.
Wherein, determine whether that the step of sending data to be transmitted is specific according to the testing result of ECCA channel detection process
If including: that ECCA channel detection process detects channel idle, data to be transmitted are sent；If ECCA channel detection process is examined
Channel busy is measured, then does not send data to be transmitted.
In any of the above-described technical solution, it is preferable that the processing unit 404 is also used to, if data to be transmitted are in institute
Stating ECCA channel detection process terminates to reach before, then at the end of the ECCA channel detection process or described to be transmitted
When data reach, the ECCA channel detection process is restarted；The Channel Detection device further include: third transmission unit
412, determine whether to send for the testing result according to the ECCA channel detection process of restarting described to be transmitted
Data.
Wherein, determine whether to send data to be transmitted according to the testing result of the ECCA channel detection process of restarting
The step of specifically include: if restarting ECCA channel detection process detect channel idle, send data to be transmitted；
If the ECCA channel detection process of restarting detects channel busy, data to be transmitted are not sent.
In any of the above-described technical solution, it is preferable that the processing unit 404 is also used to:
After a Channel holding time in office, and before opening the ECCA channel detection process, defer is executed
Period process；And
In the ECCA channel detection process, if any ECCA detects granularity Detection to channel busy, described any
ECCA executes defer period process after detecting granularity.
Fig. 5 shows the schematic block diagram of the base station of embodiment according to the present invention.
As shown in figure 5, the base station 500 of embodiment according to the present invention, comprising: Channel Detection device as shown in Figure 4
400。
Fig. 6 shows the schematic block diagram of the terminal of embodiment according to the present invention.
As shown in fig. 6, the terminal 600 of embodiment according to the present invention, comprising: Channel Detection device as shown in Figure 4
400。
In conclusion the present invention is mainly to give the item of triggering ECCA channel procedure and the triggering of ICCA Channel Detection
Part, to guarantee fairness of multiple sending points when seizing unlicensed spectrum.It is specific as follows:
One, after any Channel holding time terminates, regardless of whether there are also data in the buffer of sending point, all
Open ECCA channel detection process.
If there are no data in buffer 1, at the end of the ECCA detection process, then the sending point can enter
Idle (free time) state.In the next time, if data packet arrives, ICCA Channel Detection can be used.
If just having data in buffer 2, when the ECCA detection process starts, then after ECCA process, if
ECCA testing result is channel idle, then starts new primary Channel holding time, send the data in buffer.
If 3, having data arrival during the ECCA detection process, there can be the following two kinds processing method:
1) after the secondary ECCA process, if ECCA testing result is channel idle, starts new primary channel and account for
With the time, the data in buffer are sent.
2) after the secondary ECCA process or when data reach, the primary new ECCA detection process of restarting,
After new ECCA detection process, if new ECCA testing result is channel idle, when starting newly primary channel occupancy
Between, send the data in buffer.
Two, after Channel holding time terminates, and before the unlatching of ECCA process, a defer is needed to configure
The process of period.During ECCA, if any ECCA detects granularity Detection to channel busy, it is also required to configuration one
The process of defer period.
The technical scheme of the present invention has been explained in detail above with reference to the attached drawings, it is contemplated that in the case where channel is busier, hair
It send o'clock after a Channel holding time terminates, one may be carried out before data transmission without ECCA process
Secondary initial ICCA Channel Detection easier than ECCA process will rob account for channel in this way, affect sending point seize it is unauthorized
Fairness when frequency spectrum.Therefore, the invention proposes a kind of new Channel Detection schemes, can specify sender and execute ECCA mistake
Fairness of the sender when seizing unlicensed spectrum has been effectively ensured in the condition of journey and ICCA process.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (8)
1. a kind of channel detection method characterized by comprising
Sender judges whether Channel holding time terminates during busy channel transmits data；
At the end of determining any secondary channel holding time, ECCA channel detection process is opened；
After a Channel holding time in office, and before opening the ECCA channel detection process, defer is executed
Period process；And
In the ECCA channel detection process, if any ECCA detects granularity Detection to channel busy, in any ECCA
Defer period process is executed after detecting granularity.
2. channel detection method according to claim 1, which is characterized in that open the ECCA channel detection process it
Afterwards, further includes:
At the end of the ECCA channel detection process, data to be transmitted are judged whether there is；
If it is determined that the data to be transmitted are not present, then enter idle state, and when the data to be transmitted reach, opens
Dynamic ICCA channel detection process；
Determined whether to send the data to be transmitted according to the testing result of the ICCA channel detection process.
3. channel detection method according to claim 1, which is characterized in that open the ECCA channel detection process it
Afterwards, further includes:
If data to be transmitted have existed when the ECCA channel detection process is opened or the data to be transmitted are in institute
Stating ECCA channel detection process terminates to reach before, then after the ECCA channel detection process, is believed according to the ECCA
The testing result of road detection process determines whether to send the data to be transmitted.
4. channel detection method according to claim 1, which is characterized in that open the ECCA channel detection process it
Afterwards, further includes:
If data to be transmitted reach before the ECCA channel detection process terminates, in the ECCA channel detection process
At the end of or the data to be transmitted reach when, restart the ECCA channel detection process, and according to restarting
The testing result of the ECCA channel detection process determine whether to send the data to be transmitted.
5. a kind of Channel Detection device characterized by comprising
First judging unit judges whether Channel holding time is tied for sender during busy channel transmits data
Beam；
Processing unit, for opening ECCA channel at the end of first judging unit determines any secondary channel holding time
Detection process；
The processing unit is also used to:
After a Channel holding time in office, and before opening the ECCA channel detection process, defer is executed
Period process；And
In the ECCA channel detection process, if any ECCA detects granularity Detection to channel busy, in any ECCA
Defer period process is executed after detecting granularity.
6. Channel Detection device according to claim 5, which is characterized in that further include: second judgment unit, in institute
At the end of stating ECCA channel detection process, data to be transmitted are judged whether there is；
The processing unit is also used to, and determines to control institute there is no when the data to be transmitted in the second judgment unit
It states sender and enters idle state, and when the data to be transmitted reach, start ICCA channel detection process；
The Channel Detection device further include: the first transmission unit, for the detection knot according to the ICCA channel detection process
Fruit determines whether to send the data to be transmitted.
7. Channel Detection device according to claim 5, which is characterized in that further include:
Second transmission unit, if data to be transmitted had existed when the ECCA channel detection process is opened or it is described to
The data of transmission reach before the ECCA channel detection process terminates, then after the ECCA channel detection process,
Determined whether to send the data to be transmitted according to the testing result of the ECCA channel detection process.
8. Channel Detection device according to claim 5, which is characterized in that the processing unit is also used to, if to be transmitted
Data reached before the ECCA channel detection process terminates, then at the end of the ECCA channel detection process or in institute
When stating data to be transmitted arrival, the ECCA channel detection process is restarted；
The Channel Detection device further include: third transmission unit, for the ECCA Channel Detection mistake according to restarting
The testing result of journey determines whether to send the data to be transmitted.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510623238.4A CN105307179B (en) | 2015-09-25 | 2015-09-25 | Channel detection method and Channel Detection device |
| PCT/CN2015/093485 WO2017049720A1 (en) | 2015-09-25 | 2015-10-31 | Channel detection method and channel detection apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510623238.4A CN105307179B (en) | 2015-09-25 | 2015-09-25 | Channel detection method and Channel Detection device |
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| CN105307179B true CN105307179B (en) | 2018-12-25 |
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| CN107046731A (en) * | 2016-02-05 | 2017-08-15 | 索尼公司 | Electronic equipment and wireless communications method in wireless communication system |
| EP3800920A4 (en) | 2018-06-11 | 2021-06-30 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Method, network device, and terminal device for channel transmission on unlicensed spectrum |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333873A (en) * | 2014-11-28 | 2015-02-04 | 东莞宇龙通信科技有限公司 | Channel detection method and system, as well as equipment and terminal having functions of base station |
| CN104539405A (en) * | 2015-01-28 | 2015-04-22 | 深圳酷派技术有限公司 | Channel detection method, channel detection system, base station and terminal |
| CN104717686A (en) * | 2015-03-31 | 2015-06-17 | 深圳酷派技术有限公司 | Channel detection method of unauthorized frequency band and network cell equipment |
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| WO2014209919A1 (en) * | 2013-06-24 | 2014-12-31 | Mediatek Singapore Pte. Ltd. | Increased network throughput with cca level enhancement |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104333873A (en) * | 2014-11-28 | 2015-02-04 | 东莞宇龙通信科技有限公司 | Channel detection method and system, as well as equipment and terminal having functions of base station |
| CN104539405A (en) * | 2015-01-28 | 2015-04-22 | 深圳酷派技术有限公司 | Channel detection method, channel detection system, base station and terminal |
| CN104717686A (en) * | 2015-03-31 | 2015-06-17 | 深圳酷派技术有限公司 | Channel detection method of unauthorized frequency band and network cell equipment |
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| WO2017049720A1 (en) | 2017-03-30 |
| CN105307179A (en) | 2016-02-03 |
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